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6660 lines
199 KiB
Go
6660 lines
199 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package ipnlocal
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import (
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"cmp"
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"context"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"maps"
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"math"
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"math/rand"
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"net"
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"net/http"
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"net/netip"
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"net/url"
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"os"
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"os/user"
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"path/filepath"
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"runtime"
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"slices"
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"sort"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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"go4.org/mem"
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"go4.org/netipx"
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xmaps "golang.org/x/exp/maps"
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"gvisor.dev/gvisor/pkg/tcpip"
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"tailscale.com/appc"
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"tailscale.com/client/tailscale/apitype"
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"tailscale.com/clientupdate"
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"tailscale.com/control/controlclient"
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"tailscale.com/control/controlknobs"
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"tailscale.com/doctor"
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"tailscale.com/doctor/ethtool"
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"tailscale.com/doctor/permissions"
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"tailscale.com/doctor/routetable"
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"tailscale.com/drive"
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"tailscale.com/envknob"
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"tailscale.com/health"
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"tailscale.com/health/healthmsg"
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"tailscale.com/hostinfo"
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"tailscale.com/ipn"
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"tailscale.com/ipn/conffile"
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"tailscale.com/ipn/ipnauth"
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"tailscale.com/ipn/ipnstate"
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"tailscale.com/ipn/policy"
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"tailscale.com/log/sockstatlog"
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"tailscale.com/logpolicy"
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"tailscale.com/net/dns"
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"tailscale.com/net/dnscache"
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"tailscale.com/net/dnsfallback"
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"tailscale.com/net/netcheck"
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"tailscale.com/net/netkernelconf"
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"tailscale.com/net/netmon"
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"tailscale.com/net/netns"
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"tailscale.com/net/netutil"
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"tailscale.com/net/tsaddr"
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"tailscale.com/net/tsdial"
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"tailscale.com/paths"
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"tailscale.com/portlist"
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"tailscale.com/syncs"
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"tailscale.com/tailcfg"
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"tailscale.com/taildrop"
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"tailscale.com/tka"
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"tailscale.com/tsd"
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"tailscale.com/tstime"
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"tailscale.com/types/appctype"
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"tailscale.com/types/dnstype"
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"tailscale.com/types/empty"
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"tailscale.com/types/key"
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"tailscale.com/types/logger"
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"tailscale.com/types/logid"
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"tailscale.com/types/netmap"
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"tailscale.com/types/opt"
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"tailscale.com/types/persist"
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"tailscale.com/types/preftype"
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"tailscale.com/types/ptr"
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"tailscale.com/types/views"
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"tailscale.com/util/deephash"
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"tailscale.com/util/dnsname"
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"tailscale.com/util/httpm"
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"tailscale.com/util/mak"
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"tailscale.com/util/multierr"
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"tailscale.com/util/osshare"
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"tailscale.com/util/rands"
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"tailscale.com/util/set"
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"tailscale.com/util/syspolicy"
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"tailscale.com/util/systemd"
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"tailscale.com/util/testenv"
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"tailscale.com/util/uniq"
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"tailscale.com/version"
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"tailscale.com/version/distro"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/capture"
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"tailscale.com/wgengine/filter"
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"tailscale.com/wgengine/magicsock"
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"tailscale.com/wgengine/router"
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"tailscale.com/wgengine/wgcfg"
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"tailscale.com/wgengine/wgcfg/nmcfg"
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)
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var controlDebugFlags = getControlDebugFlags()
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func getControlDebugFlags() []string {
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if e := envknob.String("TS_DEBUG_CONTROL_FLAGS"); e != "" {
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return strings.Split(e, ",")
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}
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return nil
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}
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// SSHServer is the interface of the conditionally linked ssh/tailssh.server.
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type SSHServer interface {
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HandleSSHConn(net.Conn) error
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// NumActiveConns returns the number of connections passed to HandleSSHConn
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// that are still active.
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NumActiveConns() int
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// OnPolicyChange is called when the SSH access policy changes,
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// so that existing sessions can be re-evaluated for validity
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// and closed if they'd no longer be accepted.
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OnPolicyChange()
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// Shutdown is called when tailscaled is shutting down.
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Shutdown()
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}
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type newSSHServerFunc func(logger.Logf, *LocalBackend) (SSHServer, error)
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var newSSHServer newSSHServerFunc // or nil
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// RegisterNewSSHServer lets the conditionally linked ssh/tailssh package register itself.
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func RegisterNewSSHServer(fn newSSHServerFunc) {
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newSSHServer = fn
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}
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// watchSession represents a WatchNotifications channel
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// and sessionID as required to close targeted buses.
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type watchSession struct {
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ch chan *ipn.Notify
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sessionID string
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}
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// lastSuggestedExitNode stores the last suggested exit node ID and name in local backend.
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type lastSuggestedExitNode struct {
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id tailcfg.StableNodeID
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name string
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}
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// LocalBackend is the glue between the major pieces of the Tailscale
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// network software: the cloud control plane (via controlclient), the
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// network data plane (via wgengine), and the user-facing UIs and CLIs
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// (collectively called "frontends", via LocalBackend's implementation
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// of the Backend interface).
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//
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// LocalBackend implements the overall state machine for the Tailscale
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// application. Frontends, controlclient and wgengine can feed events
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// into LocalBackend to advance the state machine, and advancing the
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// state machine generates events back out to zero or more components.
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type LocalBackend struct {
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// Elements that are thread-safe or constant after construction.
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ctx context.Context // canceled by Close
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ctxCancel context.CancelFunc // cancels ctx
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logf logger.Logf // general logging
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keyLogf logger.Logf // for printing list of peers on change
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statsLogf logger.Logf // for printing peers stats on change
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sys *tsd.System
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health *health.Tracker // always non-nil
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e wgengine.Engine // non-nil; TODO(bradfitz): remove; use sys
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store ipn.StateStore // non-nil; TODO(bradfitz): remove; use sys
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dialer *tsdial.Dialer // non-nil; TODO(bradfitz): remove; use sys
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pushDeviceToken syncs.AtomicValue[string]
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backendLogID logid.PublicID
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unregisterNetMon func()
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unregisterHealthWatch func()
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portpoll *portlist.Poller // may be nil
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portpollOnce sync.Once // guards starting readPoller
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gotPortPollRes chan struct{} // closed upon first readPoller result
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varRoot string // or empty if SetVarRoot never called
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logFlushFunc func() // or nil if SetLogFlusher wasn't called
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em *expiryManager // non-nil
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sshAtomicBool atomic.Bool
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// webClientAtomicBool controls whether the web client is running. This should
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// be true unless the disable-web-client node attribute has been set.
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webClientAtomicBool atomic.Bool
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// exposeRemoteWebClientAtomicBool controls whether the web client is exposed over
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// Tailscale on port 5252.
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exposeRemoteWebClientAtomicBool atomic.Bool
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shutdownCalled bool // if Shutdown has been called
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debugSink *capture.Sink
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sockstatLogger *sockstatlog.Logger
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// getTCPHandlerForFunnelFlow returns a handler for an incoming TCP flow for
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// the provided srcAddr and dstPort if one exists.
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//
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// srcAddr is the source address of the flow, not the address of the Funnel
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// node relaying the flow.
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// dstPort is the destination port of the flow.
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//
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// It returns nil if there is no known handler for this flow.
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//
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// This is specifically used to handle TCP flows for Funnel connections to tsnet
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// servers.
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//
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// It is set once during initialization, and can be nil if SetTCPHandlerForFunnelFlow
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// is never called.
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getTCPHandlerForFunnelFlow func(srcAddr netip.AddrPort, dstPort uint16) (handler func(net.Conn))
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filterAtomic atomic.Pointer[filter.Filter]
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containsViaIPFuncAtomic syncs.AtomicValue[func(netip.Addr) bool]
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shouldInterceptTCPPortAtomic syncs.AtomicValue[func(uint16) bool]
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numClientStatusCalls atomic.Uint32
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// The mutex protects the following elements.
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mu sync.Mutex
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conf *conffile.Config // latest parsed config, or nil if not in declarative mode
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pm *profileManager // mu guards access
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filterHash deephash.Sum
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httpTestClient *http.Client // for controlclient. nil by default, used by tests.
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ccGen clientGen // function for producing controlclient; lazily populated
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sshServer SSHServer // or nil, initialized lazily.
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appConnector *appc.AppConnector // or nil, initialized when configured.
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// notifyCancel cancels notifications to the current SetNotifyCallback.
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notifyCancel context.CancelFunc
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cc controlclient.Client
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ccAuto *controlclient.Auto // if cc is of type *controlclient.Auto
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machinePrivKey key.MachinePrivate
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tka *tkaState
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state ipn.State
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capFileSharing bool // whether netMap contains the file sharing capability
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capTailnetLock bool // whether netMap contains the tailnet lock capability
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// hostinfo is mutated in-place while mu is held.
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hostinfo *tailcfg.Hostinfo
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// netMap is the most recently set full netmap from the controlclient.
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// It can't be mutated in place once set. Because it can't be mutated in place,
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// delta updates from the control server don't apply to it. Instead, use
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// the peers map to get up-to-date information on the state of peers.
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// In general, avoid using the netMap.Peers slice. We'd like it to go away
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// as of 2023-09-17.
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netMap *netmap.NetworkMap
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// peers is the set of current peers and their current values after applying
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// delta node mutations as they come in (with mu held). The map values can
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// be given out to callers, but the map itself must not escape the LocalBackend.
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peers map[tailcfg.NodeID]tailcfg.NodeView
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nodeByAddr map[netip.Addr]tailcfg.NodeID
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nmExpiryTimer tstime.TimerController // for updating netMap on node expiry; can be nil
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activeLogin string // last logged LoginName from netMap
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engineStatus ipn.EngineStatus
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endpoints []tailcfg.Endpoint
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blocked bool
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keyExpired bool
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authURL string // non-empty if not Running
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authURLTime time.Time // when the authURL was received from the control server
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egg bool
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prevIfState *netmon.State
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peerAPIServer *peerAPIServer // or nil
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peerAPIListeners []*peerAPIListener
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loginFlags controlclient.LoginFlags
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fileWaiters set.HandleSet[context.CancelFunc] // of wake-up funcs
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notifyWatchers map[string]*watchSession // by session ID
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lastStatusTime time.Time // status.AsOf value of the last processed status update
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// directFileRoot, if non-empty, means to write received files
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// directly to this directory, without staging them in an
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// intermediate buffered directory for "pick-up" later. If
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// empty, the files are received in a daemon-owned location
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// and the localapi is used to enumerate, download, and delete
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// them. This is used on macOS where the GUI lifetime is the
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// same as the Network Extension lifetime and we can thus avoid
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// double-copying files by writing them to the right location
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// immediately.
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// It's also used on several NAS platforms (Synology, TrueNAS, etc)
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// but in that case DoFinalRename is also set true, which moves the
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// *.partial file to its final name on completion.
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directFileRoot string
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componentLogUntil map[string]componentLogState
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// c2nUpdateStatus is the status of c2n-triggered client update.
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c2nUpdateStatus updateStatus
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currentUser ipnauth.WindowsToken
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selfUpdateProgress []ipnstate.UpdateProgress
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lastSelfUpdateState ipnstate.SelfUpdateStatus
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// capForcedNetfilter is the netfilter that control instructs Linux clients
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// to use, unless overridden locally.
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capForcedNetfilter string
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// ServeConfig fields. (also guarded by mu)
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lastServeConfJSON mem.RO // last JSON that was parsed into serveConfig
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serveConfig ipn.ServeConfigView // or !Valid if none
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webClient webClient
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webClientListeners map[netip.AddrPort]*localListener // listeners for local web client traffic
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serveListeners map[netip.AddrPort]*localListener // listeners for local serve traffic
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serveProxyHandlers sync.Map // string (HTTPHandler.Proxy) => *reverseProxy
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// statusLock must be held before calling statusChanged.Wait() or
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// statusChanged.Broadcast().
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statusLock sync.Mutex
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statusChanged *sync.Cond
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// dialPlan is any dial plan that we've received from the control
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// server during a previous connection; it is cleared on logout.
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dialPlan atomic.Pointer[tailcfg.ControlDialPlan]
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// tkaSyncLock is used to make tkaSyncIfNeeded an exclusive
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// section. This is needed to stop two map-responses in quick succession
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// from racing each other through TKA sync logic / RPCs.
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//
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// tkaSyncLock MUST be taken before mu (or inversely, mu must not be held
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// at the moment that tkaSyncLock is taken).
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tkaSyncLock sync.Mutex
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clock tstime.Clock
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// Last ClientVersion received in MapResponse, guarded by mu.
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lastClientVersion *tailcfg.ClientVersion
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// lastNotifiedDriveShares keeps track of the last set of shares that we
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// notified about.
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lastNotifiedDriveShares atomic.Pointer[views.SliceView[*drive.Share, drive.ShareView]]
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// outgoingFiles keeps track of Taildrop outgoing files keyed to their OutgoingFile.ID
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outgoingFiles map[string]*ipn.OutgoingFile
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// lastSuggestedExitNode stores the last suggested exit node ID and name.
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// lastSuggestedExitNode updates whenever the suggestion changes.
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lastSuggestedExitNode lastSuggestedExitNode
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}
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// HealthTracker returns the health tracker for the backend.
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func (b *LocalBackend) HealthTracker() *health.Tracker {
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return b.health
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}
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// NetMon returns the network monitor for the backend.
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func (b *LocalBackend) NetMon() *netmon.Monitor {
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return b.sys.NetMon.Get()
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}
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type updateStatus struct {
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started bool
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}
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// clientGen is a func that creates a control plane client.
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// It's the type used by LocalBackend.SetControlClientGetterForTesting.
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type clientGen func(controlclient.Options) (controlclient.Client, error)
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// NewLocalBackend returns a new LocalBackend that is ready to run,
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// but is not actually running.
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//
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// If dialer is nil, a new one is made.
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func NewLocalBackend(logf logger.Logf, logID logid.PublicID, sys *tsd.System, loginFlags controlclient.LoginFlags) (*LocalBackend, error) {
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e := sys.Engine.Get()
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store := sys.StateStore.Get()
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dialer := sys.Dialer.Get()
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if dialer == nil {
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return nil, errors.New("dialer to NewLocalBackend must be set")
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}
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if dialer.NetMon() == nil {
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return nil, errors.New("dialer to NewLocalBackend must have a NetMon")
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}
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mConn := sys.MagicSock.Get()
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goos := envknob.GOOS()
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if loginFlags&controlclient.LocalBackendStartKeyOSNeutral != 0 {
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goos = ""
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}
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pm, err := newProfileManagerWithGOOS(store, logf, sys.HealthTracker(), goos)
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if err != nil {
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return nil, err
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}
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if sds, ok := store.(ipn.StateStoreDialerSetter); ok {
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sds.SetDialer(dialer.SystemDial)
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}
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if sys.InitialConfig != nil {
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p := pm.CurrentPrefs().AsStruct()
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mp, err := sys.InitialConfig.Parsed.ToPrefs()
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if err != nil {
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return nil, err
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}
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p.ApplyEdits(&mp)
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if err := pm.SetPrefs(p.View(), ipn.NetworkProfile{}); err != nil {
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return nil, err
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}
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}
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envknob.LogCurrent(logf)
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if dialer == nil {
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dialer = &tsdial.Dialer{Logf: logf}
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}
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osshare.SetFileSharingEnabled(false, logf)
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ctx, cancel := context.WithCancel(context.Background())
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clock := tstime.StdClock{}
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b := &LocalBackend{
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ctx: ctx,
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ctxCancel: cancel,
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logf: logf,
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keyLogf: logger.LogOnChange(logf, 5*time.Minute, clock.Now),
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statsLogf: logger.LogOnChange(logf, 5*time.Minute, clock.Now),
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sys: sys,
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health: sys.HealthTracker(),
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conf: sys.InitialConfig,
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e: e,
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dialer: dialer,
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store: store,
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pm: pm,
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backendLogID: logID,
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state: ipn.NoState,
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portpoll: new(portlist.Poller),
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em: newExpiryManager(logf),
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gotPortPollRes: make(chan struct{}),
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loginFlags: loginFlags,
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clock: clock,
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selfUpdateProgress: make([]ipnstate.UpdateProgress, 0),
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lastSelfUpdateState: ipnstate.UpdateFinished,
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}
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mConn.SetNetInfoCallback(b.setNetInfo)
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netMon := sys.NetMon.Get()
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b.sockstatLogger, err = sockstatlog.NewLogger(logpolicy.LogsDir(logf), logf, logID, netMon, sys.HealthTracker())
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if err != nil {
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log.Printf("error setting up sockstat logger: %v", err)
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}
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// Enable sockstats logs only on non-mobile unstable builds
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if version.IsUnstableBuild() && !version.IsMobile() && b.sockstatLogger != nil {
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b.sockstatLogger.SetLoggingEnabled(true)
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}
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// Default filter blocks everything and logs nothing, until Start() is called.
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noneFilter := filter.NewAllowNone(logf, &netipx.IPSet{})
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b.setFilter(noneFilter)
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b.e.SetJailedFilter(noneFilter)
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b.setTCPPortsIntercepted(nil)
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b.statusChanged = sync.NewCond(&b.statusLock)
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b.e.SetStatusCallback(b.setWgengineStatus)
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b.prevIfState = netMon.InterfaceState()
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// Call our linkChange code once with the current state, and
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// then also whenever it changes:
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b.linkChange(&netmon.ChangeDelta{New: netMon.InterfaceState()})
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b.unregisterNetMon = netMon.RegisterChangeCallback(b.linkChange)
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b.unregisterHealthWatch = b.health.RegisterWatcher(b.onHealthChange)
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if tunWrap, ok := b.sys.Tun.GetOK(); ok {
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tunWrap.PeerAPIPort = b.GetPeerAPIPort
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} else {
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b.logf("[unexpected] failed to wire up PeerAPI port for engine %T", e)
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}
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for _, component := range ipn.DebuggableComponents {
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key := componentStateKey(component)
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if ut, err := ipn.ReadStoreInt(pm.Store(), key); err == nil {
|
|
if until := time.Unix(ut, 0); until.After(b.clock.Now()) {
|
|
// conditional to avoid log spam at start when off
|
|
b.SetComponentDebugLogging(component, until)
|
|
}
|
|
}
|
|
}
|
|
|
|
// initialize Taildrive shares from saved state
|
|
fs, ok := b.sys.DriveForRemote.GetOK()
|
|
if ok {
|
|
currentShares := b.pm.prefs.DriveShares()
|
|
if currentShares.Len() > 0 {
|
|
var shares []*drive.Share
|
|
for i := range currentShares.Len() {
|
|
shares = append(shares, currentShares.At(i).AsStruct())
|
|
}
|
|
fs.SetShares(shares)
|
|
}
|
|
}
|
|
|
|
return b, nil
|
|
}
|
|
|
|
type componentLogState struct {
|
|
until time.Time
|
|
timer tstime.TimerController // if non-nil, the AfterFunc to disable it
|
|
}
|
|
|
|
func componentStateKey(component string) ipn.StateKey {
|
|
return ipn.StateKey("_debug_" + component + "_until")
|
|
}
|
|
|
|
// SetComponentDebugLogging sets component's debug logging enabled until the until time.
|
|
// If until is in the past, the component's debug logging is disabled.
|
|
//
|
|
// The following components are recognized:
|
|
//
|
|
// - magicsock
|
|
// - sockstats
|
|
func (b *LocalBackend) SetComponentDebugLogging(component string, until time.Time) error {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
var setEnabled func(bool)
|
|
switch component {
|
|
case "magicsock":
|
|
setEnabled = b.MagicConn().SetDebugLoggingEnabled
|
|
case "sockstats":
|
|
if b.sockstatLogger != nil {
|
|
setEnabled = func(v bool) {
|
|
b.sockstatLogger.SetLoggingEnabled(v)
|
|
// Flush (and thus upload) logs when the enabled period ends,
|
|
// so that the logs are available for debugging.
|
|
if !v {
|
|
b.sockstatLogger.Flush()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if setEnabled == nil || !slices.Contains(ipn.DebuggableComponents, component) {
|
|
return fmt.Errorf("unknown component %q", component)
|
|
}
|
|
timeUnixOrZero := func(t time.Time) int64 {
|
|
if t.IsZero() {
|
|
return 0
|
|
}
|
|
return t.Unix()
|
|
}
|
|
ipn.PutStoreInt(b.store, componentStateKey(component), timeUnixOrZero(until))
|
|
now := b.clock.Now()
|
|
on := now.Before(until)
|
|
setEnabled(on)
|
|
var onFor time.Duration
|
|
if on {
|
|
onFor = until.Sub(now)
|
|
b.logf("debugging logging for component %q enabled for %v (until %v)", component, onFor.Round(time.Second), until.UTC().Format(time.RFC3339))
|
|
} else {
|
|
b.logf("debugging logging for component %q disabled", component)
|
|
}
|
|
if oldSt, ok := b.componentLogUntil[component]; ok && oldSt.timer != nil {
|
|
oldSt.timer.Stop()
|
|
}
|
|
newSt := componentLogState{until: until}
|
|
if on {
|
|
newSt.timer = b.clock.AfterFunc(onFor, func() {
|
|
// Turn off logging after the timer fires, as long as the state is
|
|
// unchanged when the timer actually fires.
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if ls := b.componentLogUntil[component]; ls.until.Equal(until) {
|
|
setEnabled(false)
|
|
b.logf("debugging logging for component %q disabled (by timer)", component)
|
|
}
|
|
})
|
|
}
|
|
mak.Set(&b.componentLogUntil, component, newSt)
|
|
return nil
|
|
}
|
|
|
|
// GetComponentDebugLogging gets the time that component's debug logging is
|
|
// enabled until, or the zero time if component's time is not currently
|
|
// enabled.
|
|
func (b *LocalBackend) GetComponentDebugLogging(component string) time.Time {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
now := b.clock.Now()
|
|
ls := b.componentLogUntil[component]
|
|
if ls.until.IsZero() || ls.until.Before(now) {
|
|
return time.Time{}
|
|
}
|
|
return ls.until
|
|
}
|
|
|
|
// Dialer returns the backend's dialer.
|
|
// It is always non-nil.
|
|
func (b *LocalBackend) Dialer() *tsdial.Dialer {
|
|
return b.dialer
|
|
}
|
|
|
|
// SetDirectFileRoot sets the directory to download files to directly,
|
|
// without buffering them through an intermediate daemon-owned
|
|
// tailcfg.UserID-specific directory.
|
|
//
|
|
// This must be called before the LocalBackend starts being used.
|
|
func (b *LocalBackend) SetDirectFileRoot(dir string) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.directFileRoot = dir
|
|
}
|
|
|
|
// ReloadConfig reloads the backend's config from disk.
|
|
//
|
|
// It returns (false, nil) if not running in declarative mode, (true, nil) on
|
|
// success, or (false, error) on failure.
|
|
func (b *LocalBackend) ReloadConfig() (ok bool, err error) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.conf == nil {
|
|
return false, nil
|
|
}
|
|
conf, err := conffile.Load(b.conf.Path)
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
b.conf = conf
|
|
// TODO(bradfitz): apply things
|
|
return true, nil
|
|
}
|
|
|
|
var assumeNetworkUpdateForTest = envknob.RegisterBool("TS_ASSUME_NETWORK_UP_FOR_TEST")
|
|
|
|
// pauseOrResumeControlClientLocked pauses b.cc if there is no network available
|
|
// or if the LocalBackend is in Stopped state with a valid NetMap. In all other
|
|
// cases, it unpauses it. It is a no-op if b.cc is nil.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) pauseOrResumeControlClientLocked() {
|
|
if b.cc == nil {
|
|
return
|
|
}
|
|
networkUp := b.prevIfState.AnyInterfaceUp()
|
|
b.cc.SetPaused((b.state == ipn.Stopped && b.netMap != nil) || (!networkUp && !testenv.InTest() && !assumeNetworkUpdateForTest()))
|
|
}
|
|
|
|
// linkChange is our network monitor callback, called whenever the network changes.
|
|
func (b *LocalBackend) linkChange(delta *netmon.ChangeDelta) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
ifst := delta.New
|
|
hadPAC := b.prevIfState.HasPAC()
|
|
b.prevIfState = ifst
|
|
b.pauseOrResumeControlClientLocked()
|
|
|
|
// If the PAC-ness of the network changed, reconfig wireguard+route to
|
|
// add/remove subnets.
|
|
if hadPAC != ifst.HasPAC() {
|
|
b.logf("linkChange: in state %v; PAC changed from %v->%v", b.state, hadPAC, ifst.HasPAC())
|
|
switch b.state {
|
|
case ipn.NoState, ipn.Stopped:
|
|
// Do nothing.
|
|
default:
|
|
go b.authReconfig()
|
|
}
|
|
}
|
|
|
|
// If the local network configuration has changed, our filter may
|
|
// need updating to tweak default routes.
|
|
b.updateFilterLocked(b.netMap, b.pm.CurrentPrefs())
|
|
updateExitNodeUsageWarning(b.pm.CurrentPrefs(), delta.New, b.health)
|
|
|
|
if peerAPIListenAsync && b.netMap != nil && b.state == ipn.Running {
|
|
want := b.netMap.GetAddresses().Len()
|
|
if len(b.peerAPIListeners) < want {
|
|
b.logf("linkChange: peerAPIListeners too low; trying again")
|
|
go b.initPeerAPIListener()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) onHealthChange(sys health.Subsystem, err error) {
|
|
if err == nil {
|
|
b.logf("health(%q): ok", sys)
|
|
} else {
|
|
b.logf("health(%q): error: %v", sys, err)
|
|
}
|
|
}
|
|
|
|
// Shutdown halts the backend and all its sub-components. The backend
|
|
// can no longer be used after Shutdown returns.
|
|
func (b *LocalBackend) Shutdown() {
|
|
b.mu.Lock()
|
|
if b.shutdownCalled {
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
b.shutdownCalled = true
|
|
|
|
if b.loginFlags&controlclient.LoginEphemeral != 0 {
|
|
b.mu.Unlock()
|
|
ctx, cancel := context.WithTimeout(b.ctx, 5*time.Second)
|
|
defer cancel()
|
|
t0 := time.Now()
|
|
err := b.Logout(ctx) // best effort
|
|
td := time.Since(t0).Round(time.Millisecond)
|
|
if err != nil {
|
|
b.logf("failed to log out ephemeral node on shutdown after %v: %v", td, err)
|
|
} else {
|
|
b.logf("logged out ephemeral node on shutdown")
|
|
}
|
|
b.mu.Lock()
|
|
}
|
|
cc := b.cc
|
|
if b.sshServer != nil {
|
|
b.sshServer.Shutdown()
|
|
b.sshServer = nil
|
|
}
|
|
b.closePeerAPIListenersLocked()
|
|
if b.debugSink != nil {
|
|
b.e.InstallCaptureHook(nil)
|
|
b.debugSink.Close()
|
|
b.debugSink = nil
|
|
}
|
|
if b.notifyCancel != nil {
|
|
b.notifyCancel()
|
|
}
|
|
b.mu.Unlock()
|
|
b.webClientShutdown()
|
|
|
|
if b.sockstatLogger != nil {
|
|
b.sockstatLogger.Shutdown()
|
|
}
|
|
if b.peerAPIServer != nil {
|
|
b.peerAPIServer.taildrop.Shutdown()
|
|
}
|
|
|
|
b.unregisterNetMon()
|
|
b.unregisterHealthWatch()
|
|
if cc != nil {
|
|
cc.Shutdown()
|
|
}
|
|
b.ctxCancel()
|
|
b.e.Close()
|
|
<-b.e.Done()
|
|
}
|
|
|
|
func stripKeysFromPrefs(p ipn.PrefsView) ipn.PrefsView {
|
|
if !p.Valid() || !p.Persist().Valid() {
|
|
return p
|
|
}
|
|
|
|
p2 := p.AsStruct()
|
|
p2.Persist.LegacyFrontendPrivateMachineKey = key.MachinePrivate{}
|
|
p2.Persist.PrivateNodeKey = key.NodePrivate{}
|
|
p2.Persist.OldPrivateNodeKey = key.NodePrivate{}
|
|
p2.Persist.NetworkLockKey = key.NLPrivate{}
|
|
return p2.View()
|
|
}
|
|
|
|
// Prefs returns a copy of b's current prefs, with any private keys removed.
|
|
func (b *LocalBackend) Prefs() ipn.PrefsView {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.sanitizedPrefsLocked()
|
|
}
|
|
|
|
func (b *LocalBackend) sanitizedPrefsLocked() ipn.PrefsView {
|
|
return stripKeysFromPrefs(b.pm.CurrentPrefs())
|
|
}
|
|
|
|
// Status returns the latest status of the backend and its
|
|
// sub-components.
|
|
func (b *LocalBackend) Status() *ipnstate.Status {
|
|
sb := &ipnstate.StatusBuilder{WantPeers: true}
|
|
b.UpdateStatus(sb)
|
|
return sb.Status()
|
|
}
|
|
|
|
// StatusWithoutPeers is like Status but omits any details
|
|
// of peers.
|
|
func (b *LocalBackend) StatusWithoutPeers() *ipnstate.Status {
|
|
sb := &ipnstate.StatusBuilder{WantPeers: false}
|
|
b.UpdateStatus(sb)
|
|
return sb.Status()
|
|
}
|
|
|
|
// UpdateStatus implements ipnstate.StatusUpdater.
|
|
func (b *LocalBackend) UpdateStatus(sb *ipnstate.StatusBuilder) {
|
|
b.e.UpdateStatus(sb) // does wireguard + magicsock status
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
sb.MutateStatus(func(s *ipnstate.Status) {
|
|
s.Version = version.Long()
|
|
s.TUN = !b.sys.IsNetstack()
|
|
s.BackendState = b.state.String()
|
|
s.AuthURL = b.authURL
|
|
if prefs := b.pm.CurrentPrefs(); prefs.Valid() && prefs.AutoUpdate().Check {
|
|
s.ClientVersion = b.lastClientVersion
|
|
}
|
|
s.Health = b.health.AppendWarnings(s.Health)
|
|
s.HaveNodeKey = b.hasNodeKeyLocked()
|
|
|
|
// TODO(bradfitz): move this health check into a health.Warnable
|
|
// and remove from here.
|
|
if m := b.sshOnButUnusableHealthCheckMessageLocked(); m != "" {
|
|
s.Health = append(s.Health, m)
|
|
}
|
|
if b.netMap != nil {
|
|
s.CertDomains = append([]string(nil), b.netMap.DNS.CertDomains...)
|
|
s.MagicDNSSuffix = b.netMap.MagicDNSSuffix()
|
|
if s.CurrentTailnet == nil {
|
|
s.CurrentTailnet = &ipnstate.TailnetStatus{}
|
|
}
|
|
s.CurrentTailnet.MagicDNSSuffix = b.netMap.MagicDNSSuffix()
|
|
s.CurrentTailnet.MagicDNSEnabled = b.netMap.DNS.Proxied
|
|
s.CurrentTailnet.Name = b.netMap.Domain
|
|
if prefs := b.pm.CurrentPrefs(); prefs.Valid() {
|
|
if !prefs.RouteAll() && b.netMap.AnyPeersAdvertiseRoutes() {
|
|
s.Health = append(s.Health, healthmsg.WarnAcceptRoutesOff)
|
|
}
|
|
if !prefs.ExitNodeID().IsZero() {
|
|
if exitPeer, ok := b.netMap.PeerWithStableID(prefs.ExitNodeID()); ok {
|
|
online := false
|
|
if v := exitPeer.Online(); v != nil {
|
|
online = *v
|
|
}
|
|
s.ExitNodeStatus = &ipnstate.ExitNodeStatus{
|
|
ID: prefs.ExitNodeID(),
|
|
Online: online,
|
|
TailscaleIPs: exitPeer.Addresses().AsSlice(),
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
})
|
|
|
|
var tailscaleIPs []netip.Addr
|
|
if b.netMap != nil {
|
|
addrs := b.netMap.GetAddresses()
|
|
for i := range addrs.Len() {
|
|
if addr := addrs.At(i); addr.IsSingleIP() {
|
|
sb.AddTailscaleIP(addr.Addr())
|
|
tailscaleIPs = append(tailscaleIPs, addr.Addr())
|
|
}
|
|
}
|
|
}
|
|
|
|
sb.MutateSelfStatus(func(ss *ipnstate.PeerStatus) {
|
|
ss.OS = version.OS()
|
|
ss.Online = b.health.GetInPollNetMap()
|
|
if b.netMap != nil {
|
|
ss.InNetworkMap = true
|
|
if hi := b.netMap.SelfNode.Hostinfo(); hi.Valid() {
|
|
ss.HostName = hi.Hostname()
|
|
}
|
|
ss.DNSName = b.netMap.Name
|
|
ss.UserID = b.netMap.User()
|
|
if sn := b.netMap.SelfNode; sn.Valid() {
|
|
peerStatusFromNode(ss, sn)
|
|
if cm := sn.CapMap(); cm.Len() > 0 {
|
|
ss.Capabilities = make([]tailcfg.NodeCapability, 1, cm.Len()+1)
|
|
ss.Capabilities[0] = "HTTPS://TAILSCALE.COM/s/DEPRECATED-NODE-CAPS#see-https://github.com/tailscale/tailscale/issues/11508"
|
|
ss.CapMap = make(tailcfg.NodeCapMap, sn.CapMap().Len())
|
|
cm.Range(func(k tailcfg.NodeCapability, v views.Slice[tailcfg.RawMessage]) bool {
|
|
ss.CapMap[k] = v.AsSlice()
|
|
ss.Capabilities = append(ss.Capabilities, k)
|
|
return true
|
|
})
|
|
slices.Sort(ss.Capabilities[1:])
|
|
}
|
|
}
|
|
for _, addr := range tailscaleIPs {
|
|
ss.TailscaleIPs = append(ss.TailscaleIPs, addr)
|
|
}
|
|
|
|
} else {
|
|
ss.HostName, _ = os.Hostname()
|
|
}
|
|
for _, pln := range b.peerAPIListeners {
|
|
ss.PeerAPIURL = append(ss.PeerAPIURL, pln.urlStr)
|
|
}
|
|
})
|
|
// TODO: hostinfo, and its networkinfo
|
|
// TODO: EngineStatus copy (and deprecate it?)
|
|
|
|
if sb.WantPeers {
|
|
b.populatePeerStatusLocked(sb)
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) populatePeerStatusLocked(sb *ipnstate.StatusBuilder) {
|
|
if b.netMap == nil {
|
|
return
|
|
}
|
|
for id, up := range b.netMap.UserProfiles {
|
|
sb.AddUser(id, up)
|
|
}
|
|
exitNodeID := b.pm.CurrentPrefs().ExitNodeID()
|
|
for _, p := range b.peers {
|
|
var lastSeen time.Time
|
|
if p.LastSeen() != nil {
|
|
lastSeen = *p.LastSeen()
|
|
}
|
|
tailscaleIPs := make([]netip.Addr, 0, p.Addresses().Len())
|
|
for i := range p.Addresses().Len() {
|
|
addr := p.Addresses().At(i)
|
|
if addr.IsSingleIP() && tsaddr.IsTailscaleIP(addr.Addr()) {
|
|
tailscaleIPs = append(tailscaleIPs, addr.Addr())
|
|
}
|
|
}
|
|
online := p.Online()
|
|
ps := &ipnstate.PeerStatus{
|
|
InNetworkMap: true,
|
|
UserID: p.User(),
|
|
AltSharerUserID: p.Sharer(),
|
|
TailscaleIPs: tailscaleIPs,
|
|
HostName: p.Hostinfo().Hostname(),
|
|
DNSName: p.Name(),
|
|
OS: p.Hostinfo().OS(),
|
|
LastSeen: lastSeen,
|
|
Online: online != nil && *online,
|
|
ShareeNode: p.Hostinfo().ShareeNode(),
|
|
ExitNode: p.StableID() != "" && p.StableID() == exitNodeID,
|
|
SSH_HostKeys: p.Hostinfo().SSH_HostKeys().AsSlice(),
|
|
Location: p.Hostinfo().Location(),
|
|
Capabilities: p.Capabilities().AsSlice(),
|
|
}
|
|
if cm := p.CapMap(); cm.Len() > 0 {
|
|
ps.CapMap = make(tailcfg.NodeCapMap, cm.Len())
|
|
cm.Range(func(k tailcfg.NodeCapability, v views.Slice[tailcfg.RawMessage]) bool {
|
|
ps.CapMap[k] = v.AsSlice()
|
|
return true
|
|
})
|
|
}
|
|
peerStatusFromNode(ps, p)
|
|
|
|
p4, p6 := peerAPIPorts(p)
|
|
if u := peerAPIURL(nodeIP(p, netip.Addr.Is4), p4); u != "" {
|
|
ps.PeerAPIURL = append(ps.PeerAPIURL, u)
|
|
}
|
|
if u := peerAPIURL(nodeIP(p, netip.Addr.Is6), p6); u != "" {
|
|
ps.PeerAPIURL = append(ps.PeerAPIURL, u)
|
|
}
|
|
sb.AddPeer(p.Key(), ps)
|
|
}
|
|
}
|
|
|
|
// peerStatusFromNode copies fields that exist in the Node struct for
|
|
// current node and peers into the provided PeerStatus.
|
|
func peerStatusFromNode(ps *ipnstate.PeerStatus, n tailcfg.NodeView) {
|
|
ps.PublicKey = n.Key()
|
|
ps.ID = n.StableID()
|
|
ps.Created = n.Created()
|
|
ps.ExitNodeOption = tsaddr.ContainsExitRoutes(n.AllowedIPs())
|
|
if n.Tags().Len() != 0 {
|
|
v := n.Tags()
|
|
ps.Tags = &v
|
|
}
|
|
if n.PrimaryRoutes().Len() != 0 {
|
|
v := n.PrimaryRoutes()
|
|
ps.PrimaryRoutes = &v
|
|
}
|
|
if n.AllowedIPs().Len() != 0 {
|
|
v := n.AllowedIPs()
|
|
ps.AllowedIPs = &v
|
|
}
|
|
|
|
if n.Expired() {
|
|
ps.Expired = true
|
|
}
|
|
if t := n.KeyExpiry(); !t.IsZero() {
|
|
t = t.Round(time.Second)
|
|
ps.KeyExpiry = &t
|
|
}
|
|
}
|
|
|
|
// WhoIs reports the node and user who owns the node with the given IP:port.
|
|
// If the IP address is a Tailscale IP, the provided port may be 0.
|
|
// If ok == true, n and u are valid.
|
|
func (b *LocalBackend) WhoIs(ipp netip.AddrPort) (n tailcfg.NodeView, u tailcfg.UserProfile, ok bool) {
|
|
var zero tailcfg.NodeView
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
nid, ok := b.nodeByAddr[ipp.Addr()]
|
|
if !ok {
|
|
var ip netip.Addr
|
|
if ipp.Port() != 0 {
|
|
ip, ok = b.sys.ProxyMapper().WhoIsIPPort(ipp)
|
|
}
|
|
if !ok {
|
|
return zero, u, false
|
|
}
|
|
nid, ok = b.nodeByAddr[ip]
|
|
if !ok {
|
|
return zero, u, false
|
|
}
|
|
}
|
|
if b.netMap == nil {
|
|
return zero, u, false
|
|
}
|
|
n, ok = b.peers[nid]
|
|
if !ok {
|
|
// Check if this the self-node, which would not appear in peers.
|
|
if !b.netMap.SelfNode.Valid() || nid != b.netMap.SelfNode.ID() {
|
|
return zero, u, false
|
|
}
|
|
n = b.netMap.SelfNode
|
|
}
|
|
u, ok = b.netMap.UserProfiles[n.User()]
|
|
if !ok {
|
|
return zero, u, false
|
|
}
|
|
return n, u, true
|
|
}
|
|
|
|
// PeerCaps returns the capabilities that remote src IP has to
|
|
// ths current node.
|
|
func (b *LocalBackend) PeerCaps(src netip.Addr) tailcfg.PeerCapMap {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.peerCapsLocked(src)
|
|
}
|
|
|
|
func (b *LocalBackend) peerCapsLocked(src netip.Addr) tailcfg.PeerCapMap {
|
|
if b.netMap == nil {
|
|
return nil
|
|
}
|
|
filt := b.filterAtomic.Load()
|
|
if filt == nil {
|
|
return nil
|
|
}
|
|
addrs := b.netMap.GetAddresses()
|
|
for i := range addrs.Len() {
|
|
a := addrs.At(i)
|
|
if !a.IsSingleIP() {
|
|
continue
|
|
}
|
|
dst := a.Addr()
|
|
if dst.BitLen() == src.BitLen() { // match on family
|
|
return filt.CapsWithValues(src, dst)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SetControlClientStatus is the callback invoked by the control client whenever it posts a new status.
|
|
// Among other things, this is where we update the netmap, packet filters, DNS and DERP maps.
|
|
func (b *LocalBackend) SetControlClientStatus(c controlclient.Client, st controlclient.Status) {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
if b.cc != c {
|
|
b.logf("Ignoring SetControlClientStatus from old client")
|
|
return
|
|
}
|
|
if st.Err != nil {
|
|
// The following do not depend on any data for which we need b locked.
|
|
unlock.UnlockEarly()
|
|
if errors.Is(st.Err, io.EOF) {
|
|
b.logf("[v1] Received error: EOF")
|
|
return
|
|
}
|
|
b.logf("Received error: %v", st.Err)
|
|
var uerr controlclient.UserVisibleError
|
|
if errors.As(st.Err, &uerr) {
|
|
s := uerr.UserVisibleError()
|
|
b.send(ipn.Notify{ErrMessage: &s})
|
|
}
|
|
return
|
|
}
|
|
|
|
// Track the number of calls
|
|
currCall := b.numClientStatusCalls.Add(1)
|
|
|
|
// Handle node expiry in the netmap
|
|
if st.NetMap != nil {
|
|
now := b.clock.Now()
|
|
b.em.flagExpiredPeers(st.NetMap, now)
|
|
|
|
// Always stop the existing netmap timer if we have a netmap;
|
|
// it's possible that we have no nodes expiring, so we should
|
|
// always cancel the timer and then possibly restart it below.
|
|
if b.nmExpiryTimer != nil {
|
|
// Ignore if we can't stop; the atomic check in the
|
|
// AfterFunc (below) will skip running.
|
|
b.nmExpiryTimer.Stop()
|
|
|
|
// Nil so we don't attempt to stop on the next netmap
|
|
b.nmExpiryTimer = nil
|
|
}
|
|
|
|
// Figure out when the next node in the netmap is expiring so we can
|
|
// start a timer to reconfigure at that point.
|
|
nextExpiry := b.em.nextPeerExpiry(st.NetMap, now)
|
|
if !nextExpiry.IsZero() {
|
|
tmrDuration := nextExpiry.Sub(now) + 10*time.Second
|
|
b.nmExpiryTimer = b.clock.AfterFunc(tmrDuration, func() {
|
|
// Skip if the world has moved on past the
|
|
// saved call (e.g. if we race stopping this
|
|
// timer).
|
|
if b.numClientStatusCalls.Load() != currCall {
|
|
return
|
|
}
|
|
|
|
b.logf("setClientStatus: netmap expiry timer triggered after %v", tmrDuration)
|
|
|
|
// Call ourselves with the current status again; the logic in
|
|
// setClientStatus will take care of updating the expired field
|
|
// of peers in the netmap.
|
|
b.SetControlClientStatus(c, st)
|
|
})
|
|
}
|
|
}
|
|
|
|
wasBlocked := b.blocked
|
|
keyExpiryExtended := false
|
|
if st.NetMap != nil {
|
|
wasExpired := b.keyExpired
|
|
isExpired := !st.NetMap.Expiry.IsZero() && st.NetMap.Expiry.Before(b.clock.Now())
|
|
if wasExpired && !isExpired {
|
|
keyExpiryExtended = true
|
|
}
|
|
b.keyExpired = isExpired
|
|
}
|
|
|
|
unlock.UnlockEarly()
|
|
|
|
if keyExpiryExtended && wasBlocked {
|
|
// Key extended, unblock the engine
|
|
b.blockEngineUpdates(false)
|
|
}
|
|
|
|
if st.LoginFinished() && (wasBlocked || b.seamlessRenewalEnabled()) {
|
|
if wasBlocked {
|
|
// Auth completed, unblock the engine
|
|
b.blockEngineUpdates(false)
|
|
}
|
|
b.authReconfig()
|
|
b.send(ipn.Notify{LoginFinished: &empty.Message{}})
|
|
}
|
|
|
|
// Lock b again and do only the things that require locking.
|
|
b.mu.Lock()
|
|
|
|
prefsChanged := false
|
|
prefs := b.pm.CurrentPrefs().AsStruct()
|
|
netMap := b.netMap
|
|
|
|
if prefs.ControlURL == "" {
|
|
// Once we get a message from the control plane, set
|
|
// our ControlURL pref explicitly. This causes a
|
|
// future "tailscale up" to start checking for
|
|
// implicit setting reverts, which it doesn't do when
|
|
// ControlURL is blank.
|
|
prefs.ControlURL = prefs.ControlURLOrDefault()
|
|
prefsChanged = true
|
|
}
|
|
if st.Persist.Valid() {
|
|
if !prefs.Persist.View().Equals(st.Persist) {
|
|
prefsChanged = true
|
|
prefs.Persist = st.Persist.AsStruct()
|
|
}
|
|
}
|
|
if st.URL != "" {
|
|
b.authURL = st.URL
|
|
b.authURLTime = b.clock.Now()
|
|
}
|
|
if (wasBlocked || b.seamlessRenewalEnabled()) && st.LoginFinished() {
|
|
// Interactive login finished successfully (URL visited).
|
|
// After an interactive login, the user always wants
|
|
// WantRunning.
|
|
if !prefs.WantRunning || prefs.LoggedOut {
|
|
prefsChanged = true
|
|
}
|
|
prefs.WantRunning = true
|
|
prefs.LoggedOut = false
|
|
}
|
|
if setExitNodeID(prefs, st.NetMap) {
|
|
prefsChanged = true
|
|
}
|
|
if applySysPolicy(prefs) {
|
|
prefsChanged = true
|
|
}
|
|
|
|
// Until recently, we did not store the account's tailnet name. So check if this is the case,
|
|
// and backfill it on incoming status update.
|
|
if b.pm.requiresBackfill() && st.NetMap != nil && st.NetMap.Domain != "" {
|
|
prefsChanged = true
|
|
}
|
|
|
|
// Perform all mutations of prefs based on the netmap here.
|
|
if prefsChanged {
|
|
// Prefs will be written out if stale; this is not safe unless locked or cloned.
|
|
if err := b.pm.SetPrefs(prefs.View(), ipn.NetworkProfile{
|
|
MagicDNSName: st.NetMap.MagicDNSSuffix(),
|
|
DomainName: st.NetMap.DomainName(),
|
|
}); err != nil {
|
|
b.logf("Failed to save new controlclient state: %v", err)
|
|
}
|
|
}
|
|
// initTKALocked is dependent on CurrentProfile.ID, which is initialized
|
|
// (for new profiles) on the first call to b.pm.SetPrefs.
|
|
if err := b.initTKALocked(); err != nil {
|
|
b.logf("initTKALocked: %v", err)
|
|
}
|
|
|
|
// Perform all reconfiguration based on the netmap here.
|
|
if st.NetMap != nil {
|
|
b.capTailnetLock = st.NetMap.HasCap(tailcfg.CapabilityTailnetLock)
|
|
b.setWebClientAtomicBoolLocked(st.NetMap)
|
|
|
|
b.mu.Unlock() // respect locking rules for tkaSyncIfNeeded
|
|
if err := b.tkaSyncIfNeeded(st.NetMap, prefs.View()); err != nil {
|
|
b.logf("[v1] TKA sync error: %v", err)
|
|
}
|
|
b.mu.Lock()
|
|
// As we stepped outside of the lock, it's possible for b.cc
|
|
// to now be nil.
|
|
if b.cc != nil {
|
|
if b.tka != nil {
|
|
head, err := b.tka.authority.Head().MarshalText()
|
|
if err != nil {
|
|
b.logf("[v1] error marshalling tka head: %v", err)
|
|
} else {
|
|
b.cc.SetTKAHead(string(head))
|
|
}
|
|
} else {
|
|
b.cc.SetTKAHead("")
|
|
}
|
|
}
|
|
|
|
if !envknob.TKASkipSignatureCheck() {
|
|
b.tkaFilterNetmapLocked(st.NetMap)
|
|
}
|
|
b.setNetMapLocked(st.NetMap)
|
|
b.updateFilterLocked(st.NetMap, prefs.View())
|
|
}
|
|
b.mu.Unlock()
|
|
|
|
// Now complete the lock-free parts of what we started while locked.
|
|
if prefsChanged {
|
|
b.send(ipn.Notify{Prefs: ptr.To(prefs.View())})
|
|
}
|
|
|
|
if st.NetMap != nil {
|
|
if envknob.NoLogsNoSupport() && st.NetMap.HasCap(tailcfg.CapabilityDataPlaneAuditLogs) {
|
|
msg := "tailnet requires logging to be enabled. Remove --no-logs-no-support from tailscaled command line."
|
|
b.health.SetLocalLogConfigHealth(errors.New(msg))
|
|
// Connecting to this tailnet without logging is forbidden; boot us outta here.
|
|
b.mu.Lock()
|
|
prefs.WantRunning = false
|
|
p := prefs.View()
|
|
if err := b.pm.SetPrefs(p, ipn.NetworkProfile{
|
|
MagicDNSName: st.NetMap.MagicDNSSuffix(),
|
|
DomainName: st.NetMap.DomainName(),
|
|
}); err != nil {
|
|
b.logf("Failed to save new controlclient state: %v", err)
|
|
}
|
|
b.mu.Unlock()
|
|
b.send(ipn.Notify{ErrMessage: &msg, Prefs: &p})
|
|
return
|
|
}
|
|
if netMap != nil {
|
|
diff := st.NetMap.ConciseDiffFrom(netMap)
|
|
if strings.TrimSpace(diff) == "" {
|
|
b.logf("[v1] netmap diff: (none)")
|
|
} else {
|
|
b.logf("[v1] netmap diff:\n%v", diff)
|
|
}
|
|
}
|
|
|
|
b.e.SetNetworkMap(st.NetMap)
|
|
b.MagicConn().SetDERPMap(st.NetMap.DERPMap)
|
|
b.MagicConn().SetOnlyTCP443(st.NetMap.HasCap(tailcfg.NodeAttrOnlyTCP443))
|
|
|
|
// Update our cached DERP map
|
|
dnsfallback.UpdateCache(st.NetMap.DERPMap, b.logf)
|
|
|
|
b.send(ipn.Notify{NetMap: st.NetMap})
|
|
}
|
|
if st.URL != "" {
|
|
b.logf("Received auth URL: %.20v...", st.URL)
|
|
b.popBrowserAuthNow()
|
|
}
|
|
b.stateMachine()
|
|
// This is currently (2020-07-28) necessary; conditionally disabling it is fragile!
|
|
// This is where netmap information gets propagated to router and magicsock.
|
|
b.authReconfig()
|
|
}
|
|
|
|
type preferencePolicyInfo struct {
|
|
key syspolicy.Key
|
|
get func(ipn.PrefsView) bool
|
|
set func(*ipn.Prefs, bool)
|
|
}
|
|
|
|
var preferencePolicies = []preferencePolicyInfo{
|
|
{
|
|
key: syspolicy.EnableIncomingConnections,
|
|
// Allow Incoming (used by the UI) is the negation of ShieldsUp (used by the
|
|
// backend), so this has to convert between the two conventions.
|
|
get: func(p ipn.PrefsView) bool { return !p.ShieldsUp() },
|
|
set: func(p *ipn.Prefs, v bool) { p.ShieldsUp = !v },
|
|
},
|
|
{
|
|
key: syspolicy.EnableServerMode,
|
|
get: func(p ipn.PrefsView) bool { return p.ForceDaemon() },
|
|
set: func(p *ipn.Prefs, v bool) { p.ForceDaemon = v },
|
|
},
|
|
{
|
|
key: syspolicy.ExitNodeAllowLANAccess,
|
|
get: func(p ipn.PrefsView) bool { return p.ExitNodeAllowLANAccess() },
|
|
set: func(p *ipn.Prefs, v bool) { p.ExitNodeAllowLANAccess = v },
|
|
},
|
|
{
|
|
key: syspolicy.EnableTailscaleDNS,
|
|
get: func(p ipn.PrefsView) bool { return p.CorpDNS() },
|
|
set: func(p *ipn.Prefs, v bool) { p.CorpDNS = v },
|
|
},
|
|
{
|
|
key: syspolicy.EnableTailscaleSubnets,
|
|
get: func(p ipn.PrefsView) bool { return p.RouteAll() },
|
|
set: func(p *ipn.Prefs, v bool) { p.RouteAll = v },
|
|
},
|
|
{
|
|
key: syspolicy.CheckUpdates,
|
|
get: func(p ipn.PrefsView) bool { return p.AutoUpdate().Check },
|
|
set: func(p *ipn.Prefs, v bool) { p.AutoUpdate.Check = v },
|
|
},
|
|
{
|
|
key: syspolicy.ApplyUpdates,
|
|
get: func(p ipn.PrefsView) bool { v, _ := p.AutoUpdate().Apply.Get(); return v },
|
|
set: func(p *ipn.Prefs, v bool) { p.AutoUpdate.Apply.Set(v) },
|
|
},
|
|
{
|
|
key: syspolicy.EnableRunExitNode,
|
|
get: func(p ipn.PrefsView) bool { return p.AdvertisesExitNode() },
|
|
set: func(p *ipn.Prefs, v bool) { p.SetAdvertiseExitNode(v) },
|
|
},
|
|
}
|
|
|
|
// applySysPolicy overwrites configured preferences with policies that may be
|
|
// configured by the system administrator in an OS-specific way.
|
|
func applySysPolicy(prefs *ipn.Prefs) (anyChange bool) {
|
|
if controlURL, err := syspolicy.GetString(syspolicy.ControlURL, prefs.ControlURL); err == nil && prefs.ControlURL != controlURL {
|
|
prefs.ControlURL = controlURL
|
|
anyChange = true
|
|
}
|
|
|
|
for _, opt := range preferencePolicies {
|
|
if po, err := syspolicy.GetPreferenceOption(opt.key); err == nil {
|
|
curVal := opt.get(prefs.View())
|
|
newVal := po.ShouldEnable(curVal)
|
|
if curVal != newVal {
|
|
opt.set(prefs, newVal)
|
|
anyChange = true
|
|
}
|
|
}
|
|
}
|
|
|
|
return anyChange
|
|
}
|
|
|
|
var _ controlclient.NetmapDeltaUpdater = (*LocalBackend)(nil)
|
|
|
|
// UpdateNetmapDelta implements controlclient.NetmapDeltaUpdater.
|
|
func (b *LocalBackend) UpdateNetmapDelta(muts []netmap.NodeMutation) (handled bool) {
|
|
if !b.MagicConn().UpdateNetmapDelta(muts) {
|
|
return false
|
|
}
|
|
|
|
var notify *ipn.Notify // non-nil if we need to send a Notify
|
|
defer func() {
|
|
if notify != nil {
|
|
b.send(*notify)
|
|
}
|
|
}()
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if !b.updateNetmapDeltaLocked(muts) {
|
|
return false
|
|
}
|
|
|
|
if b.netMap != nil && mutationsAreWorthyOfTellingIPNBus(muts) {
|
|
nm := ptr.To(*b.netMap) // shallow clone
|
|
nm.Peers = make([]tailcfg.NodeView, 0, len(b.peers))
|
|
for _, p := range b.peers {
|
|
nm.Peers = append(nm.Peers, p)
|
|
}
|
|
slices.SortFunc(nm.Peers, func(a, b tailcfg.NodeView) int {
|
|
return cmp.Compare(a.ID(), b.ID())
|
|
})
|
|
notify = &ipn.Notify{NetMap: nm}
|
|
} else if testenv.InTest() {
|
|
// In tests, send an empty Notify as a wake-up so end-to-end
|
|
// integration tests in another repo can check on the status of
|
|
// LocalBackend after processing deltas.
|
|
notify = new(ipn.Notify)
|
|
}
|
|
return true
|
|
}
|
|
|
|
// mutationsAreWorthyOfTellingIPNBus reports whether any mutation type in muts is
|
|
// worthy of spamming the IPN bus (the Windows & Mac GUIs, basically) to tell them
|
|
// about the update.
|
|
func mutationsAreWorthyOfTellingIPNBus(muts []netmap.NodeMutation) bool {
|
|
for _, m := range muts {
|
|
switch m.(type) {
|
|
case netmap.NodeMutationLastSeen,
|
|
netmap.NodeMutationOnline:
|
|
// The GUI clients might render peers differently depending on whether
|
|
// they're online.
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) updateNetmapDeltaLocked(muts []netmap.NodeMutation) (handled bool) {
|
|
if b.netMap == nil || len(b.peers) == 0 {
|
|
return false
|
|
}
|
|
|
|
// Locally cloned mutable nodes, to avoid calling AsStruct (clone)
|
|
// multiple times on a node if it's mutated multiple times in this
|
|
// call (e.g. its endpoints + online status both change)
|
|
var mutableNodes map[tailcfg.NodeID]*tailcfg.Node
|
|
|
|
for _, m := range muts {
|
|
n, ok := mutableNodes[m.NodeIDBeingMutated()]
|
|
if !ok {
|
|
nv, ok := b.peers[m.NodeIDBeingMutated()]
|
|
if !ok {
|
|
// TODO(bradfitz): unexpected metric?
|
|
return false
|
|
}
|
|
n = nv.AsStruct()
|
|
mak.Set(&mutableNodes, nv.ID(), n)
|
|
}
|
|
m.Apply(n)
|
|
}
|
|
for nid, n := range mutableNodes {
|
|
b.peers[nid] = n.View()
|
|
}
|
|
return true
|
|
}
|
|
|
|
// setExitNodeID updates prefs to reference an exit node by ID, rather
|
|
// than by IP. It returns whether prefs was mutated.
|
|
func setExitNodeID(prefs *ipn.Prefs, nm *netmap.NetworkMap) (prefsChanged bool) {
|
|
if exitNodeIDStr, _ := syspolicy.GetString(syspolicy.ExitNodeID, ""); exitNodeIDStr != "" {
|
|
exitNodeID := tailcfg.StableNodeID(exitNodeIDStr)
|
|
changed := prefs.ExitNodeID != exitNodeID || prefs.ExitNodeIP.IsValid()
|
|
prefs.ExitNodeID = exitNodeID
|
|
prefs.ExitNodeIP = netip.Addr{}
|
|
return changed
|
|
}
|
|
|
|
oldExitNodeID := prefs.ExitNodeID
|
|
if exitNodeIPStr, _ := syspolicy.GetString(syspolicy.ExitNodeIP, ""); exitNodeIPStr != "" {
|
|
exitNodeIP, err := netip.ParseAddr(exitNodeIPStr)
|
|
if exitNodeIP.IsValid() && err == nil {
|
|
prefsChanged = prefs.ExitNodeID != "" || prefs.ExitNodeIP != exitNodeIP
|
|
prefs.ExitNodeID = ""
|
|
prefs.ExitNodeIP = exitNodeIP
|
|
}
|
|
}
|
|
|
|
if nm == nil {
|
|
// No netmap, can't resolve anything.
|
|
return false
|
|
}
|
|
|
|
// If we have a desired IP on file, try to find the corresponding
|
|
// node.
|
|
if !prefs.ExitNodeIP.IsValid() {
|
|
return false
|
|
}
|
|
|
|
// IP takes precedence over ID, so if both are set, clear ID.
|
|
if prefs.ExitNodeID != "" {
|
|
prefs.ExitNodeID = ""
|
|
prefsChanged = true
|
|
}
|
|
|
|
for _, peer := range nm.Peers {
|
|
for i := range peer.Addresses().Len() {
|
|
addr := peer.Addresses().At(i)
|
|
if !addr.IsSingleIP() || addr.Addr() != prefs.ExitNodeIP {
|
|
continue
|
|
}
|
|
// Found the node being referenced, upgrade prefs to
|
|
// reference it directly for next time.
|
|
prefs.ExitNodeID = peer.StableID()
|
|
prefs.ExitNodeIP = netip.Addr{}
|
|
return oldExitNodeID != prefs.ExitNodeID
|
|
}
|
|
}
|
|
|
|
return prefsChanged
|
|
}
|
|
|
|
// setWgengineStatus is the callback by the wireguard engine whenever it posts a new status.
|
|
// This updates the endpoints both in the backend and in the control client.
|
|
func (b *LocalBackend) setWgengineStatus(s *wgengine.Status, err error) {
|
|
if err != nil {
|
|
b.logf("wgengine status error: %v", err)
|
|
b.broadcastStatusChanged()
|
|
return
|
|
}
|
|
if s == nil {
|
|
b.logf("[unexpected] non-error wgengine update with status=nil: %v", s)
|
|
b.broadcastStatusChanged()
|
|
return
|
|
}
|
|
|
|
b.mu.Lock()
|
|
if s.AsOf.Before(b.lastStatusTime) {
|
|
// Don't process a status update that is older than the one we have
|
|
// already processed. (corp#2579)
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
b.lastStatusTime = s.AsOf
|
|
es := b.parseWgStatusLocked(s)
|
|
cc := b.cc
|
|
b.engineStatus = es
|
|
needUpdateEndpoints := !endpointsEqual(s.LocalAddrs, b.endpoints)
|
|
if needUpdateEndpoints {
|
|
b.endpoints = append([]tailcfg.Endpoint{}, s.LocalAddrs...)
|
|
}
|
|
b.mu.Unlock()
|
|
|
|
if cc != nil {
|
|
if needUpdateEndpoints {
|
|
cc.UpdateEndpoints(s.LocalAddrs)
|
|
}
|
|
b.stateMachine()
|
|
}
|
|
b.broadcastStatusChanged()
|
|
b.send(ipn.Notify{Engine: &es})
|
|
}
|
|
|
|
func (b *LocalBackend) broadcastStatusChanged() {
|
|
// The sync.Cond docs say: "It is allowed but not required for the caller to hold c.L during the call."
|
|
// In this particular case, we must acquire b.statusLock. Otherwise we might broadcast before
|
|
// the waiter (in requestEngineStatusAndWait) starts to wait, in which case
|
|
// the waiter can get stuck indefinitely. See PR 2865.
|
|
b.statusLock.Lock()
|
|
b.statusChanged.Broadcast()
|
|
b.statusLock.Unlock()
|
|
}
|
|
|
|
func endpointsEqual(x, y []tailcfg.Endpoint) bool {
|
|
if len(x) != len(y) {
|
|
return false
|
|
}
|
|
for i := range x {
|
|
if x[i] != y[i] {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// SetNotifyCallback sets the function to call when the backend has something to
|
|
// notify the frontend about. Only one callback can be set at a time, so calling
|
|
// this function will replace the previous callback.
|
|
func (b *LocalBackend) SetNotifyCallback(notify func(ipn.Notify)) {
|
|
ctx, cancel := context.WithCancel(b.ctx)
|
|
b.mu.Lock()
|
|
prevCancel := b.notifyCancel
|
|
b.notifyCancel = cancel
|
|
b.mu.Unlock()
|
|
if prevCancel != nil {
|
|
prevCancel()
|
|
}
|
|
|
|
var wg sync.WaitGroup
|
|
wg.Add(1)
|
|
go b.WatchNotifications(ctx, 0, wg.Done, func(n *ipn.Notify) bool {
|
|
notify(*n)
|
|
return true
|
|
})
|
|
wg.Wait()
|
|
}
|
|
|
|
// SetHTTPTestClient sets an alternate HTTP client to use with
|
|
// connections to the coordination server. It exists for
|
|
// testing. Using nil means to use the default.
|
|
func (b *LocalBackend) SetHTTPTestClient(c *http.Client) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.httpTestClient = c
|
|
}
|
|
|
|
// SetControlClientGetterForTesting sets the func that creates a
|
|
// control plane client. It can be called at most once, before Start.
|
|
func (b *LocalBackend) SetControlClientGetterForTesting(newControlClient func(controlclient.Options) (controlclient.Client, error)) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.ccGen != nil {
|
|
panic("invalid use of SetControlClientGetterForTesting after Start")
|
|
}
|
|
b.ccGen = newControlClient
|
|
}
|
|
|
|
// NodeViewByIDForTest returns the state of the node with the given ID
|
|
// for integration tests in another repo.
|
|
func (b *LocalBackend) NodeViewByIDForTest(id tailcfg.NodeID) (_ tailcfg.NodeView, ok bool) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
n, ok := b.peers[id]
|
|
return n, ok
|
|
}
|
|
|
|
// DisablePortMapperForTest disables the portmapper for tests.
|
|
// It must be called before Start.
|
|
func (b *LocalBackend) DisablePortMapperForTest() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.portpoll = nil
|
|
}
|
|
|
|
// PeersForTest returns all the current peers, sorted by Node.ID,
|
|
// for integration tests in another repo.
|
|
func (b *LocalBackend) PeersForTest() []tailcfg.NodeView {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
ret := xmaps.Values(b.peers)
|
|
slices.SortFunc(ret, func(a, b tailcfg.NodeView) int {
|
|
return cmp.Compare(a.ID(), b.ID())
|
|
})
|
|
return ret
|
|
}
|
|
|
|
func (b *LocalBackend) getNewControlClientFuncLocked() clientGen {
|
|
if b.ccGen == nil {
|
|
// Initialize it rather than just returning the
|
|
// default to make any future call to
|
|
// SetControlClientGetterForTesting panic.
|
|
b.ccGen = func(opts controlclient.Options) (controlclient.Client, error) {
|
|
return controlclient.New(opts)
|
|
}
|
|
}
|
|
return b.ccGen
|
|
}
|
|
|
|
// Start applies the configuration specified in opts, and starts the
|
|
// state machine.
|
|
//
|
|
// TODO(danderson): this function is trying to do too many things at
|
|
// once: it loads state, or imports it, or updates prefs sometimes,
|
|
// contains some settings that are one-shot things done by `tailscale
|
|
// up` because we had nowhere else to put them, and there's no clear
|
|
// guarantee that switching from one user's state to another is
|
|
// actually a supported operation (it should be, but it's very unclear
|
|
// from the following whether or not that is a safe transition).
|
|
func (b *LocalBackend) Start(opts ipn.Options) error {
|
|
b.logf("Start")
|
|
|
|
var clientToShutdown controlclient.Client
|
|
defer func() {
|
|
if clientToShutdown != nil {
|
|
clientToShutdown.Shutdown()
|
|
}
|
|
}()
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
if opts.UpdatePrefs != nil {
|
|
if err := b.checkPrefsLocked(opts.UpdatePrefs); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
if b.state != ipn.Running && b.conf != nil && b.conf.Parsed.AuthKey != nil && opts.AuthKey == "" {
|
|
v := *b.conf.Parsed.AuthKey
|
|
if filename, ok := strings.CutPrefix(v, "file:"); ok {
|
|
b, err := os.ReadFile(filename)
|
|
if err != nil {
|
|
return fmt.Errorf("error reading config file authKey: %w", err)
|
|
}
|
|
v = strings.TrimSpace(string(b))
|
|
}
|
|
opts.AuthKey = v
|
|
}
|
|
|
|
hostinfo := hostinfo.New()
|
|
applyConfigToHostinfo(hostinfo, b.conf)
|
|
hostinfo.BackendLogID = b.backendLogID.String()
|
|
hostinfo.FrontendLogID = opts.FrontendLogID
|
|
hostinfo.Userspace.Set(b.sys.IsNetstack())
|
|
hostinfo.UserspaceRouter.Set(b.sys.IsNetstackRouter())
|
|
hostinfo.AppConnector.Set(b.appConnector != nil)
|
|
b.logf.JSON(1, "Hostinfo", hostinfo)
|
|
|
|
// TODO(apenwarr): avoid the need to reinit controlclient.
|
|
// This will trigger a full relogin/reconfigure cycle every
|
|
// time a Handle reconnects to the backend. Ideally, we
|
|
// would send the new Prefs and everything would get back
|
|
// into sync with the minimal changes. But that's not how it
|
|
// is right now, which is a sign that the code is still too
|
|
// complicated.
|
|
clientToShutdown = b.resetControlClientLocked()
|
|
httpTestClient := b.httpTestClient
|
|
|
|
if b.hostinfo != nil {
|
|
hostinfo.Services = b.hostinfo.Services // keep any previous services
|
|
}
|
|
b.hostinfo = hostinfo
|
|
b.state = ipn.NoState
|
|
|
|
if opts.UpdatePrefs != nil {
|
|
oldPrefs := b.pm.CurrentPrefs()
|
|
newPrefs := opts.UpdatePrefs.Clone()
|
|
newPrefs.Persist = oldPrefs.Persist().AsStruct()
|
|
pv := newPrefs.View()
|
|
if err := b.pm.SetPrefs(pv, ipn.NetworkProfile{
|
|
MagicDNSName: b.netMap.MagicDNSSuffix(),
|
|
DomainName: b.netMap.DomainName(),
|
|
}); err != nil {
|
|
b.logf("failed to save UpdatePrefs state: %v", err)
|
|
}
|
|
b.setAtomicValuesFromPrefsLocked(pv)
|
|
} else {
|
|
b.setAtomicValuesFromPrefsLocked(b.pm.CurrentPrefs())
|
|
}
|
|
|
|
prefs := b.pm.CurrentPrefs()
|
|
wantRunning := prefs.WantRunning()
|
|
if wantRunning {
|
|
if err := b.initMachineKeyLocked(); err != nil {
|
|
return fmt.Errorf("initMachineKeyLocked: %w", err)
|
|
}
|
|
}
|
|
|
|
loggedOut := prefs.LoggedOut()
|
|
|
|
serverURL := prefs.ControlURLOrDefault()
|
|
if inServerMode := prefs.ForceDaemon(); inServerMode || runtime.GOOS == "windows" {
|
|
b.logf("Start: serverMode=%v", inServerMode)
|
|
}
|
|
b.applyPrefsToHostinfoLocked(hostinfo, prefs)
|
|
|
|
b.setNetMapLocked(nil)
|
|
persistv := prefs.Persist().AsStruct()
|
|
if persistv == nil {
|
|
persistv = new(persist.Persist)
|
|
}
|
|
b.updateFilterLocked(nil, ipn.PrefsView{})
|
|
|
|
if b.portpoll != nil {
|
|
b.portpollOnce.Do(func() {
|
|
go b.readPoller()
|
|
|
|
// Give the poller a second to get results to
|
|
// prevent it from restarting our map poll
|
|
// HTTP request (via doSetHostinfoFilterServices >
|
|
// cli.SetHostinfo). In practice this is very quick.
|
|
t0 := b.clock.Now()
|
|
timer, timerChannel := b.clock.NewTimer(time.Second)
|
|
select {
|
|
case <-b.gotPortPollRes:
|
|
b.logf("[v1] got initial portlist info in %v", b.clock.Since(t0).Round(time.Millisecond))
|
|
timer.Stop()
|
|
case <-timerChannel:
|
|
b.logf("timeout waiting for initial portlist")
|
|
}
|
|
})
|
|
}
|
|
|
|
discoPublic := b.MagicConn().DiscoPublicKey()
|
|
|
|
var err error
|
|
|
|
isNetstack := b.sys.IsNetstackRouter()
|
|
debugFlags := controlDebugFlags
|
|
if isNetstack {
|
|
debugFlags = append([]string{"netstack"}, debugFlags...)
|
|
}
|
|
|
|
// TODO(apenwarr): The only way to change the ServerURL is to
|
|
// re-run b.Start, because this is the only place we create a
|
|
// new controlclient. EditPrefs allows you to overwrite ServerURL,
|
|
// but it won't take effect until the next Start.
|
|
cc, err := b.getNewControlClientFuncLocked()(controlclient.Options{
|
|
GetMachinePrivateKey: b.createGetMachinePrivateKeyFunc(),
|
|
Logf: logger.WithPrefix(b.logf, "control: "),
|
|
Persist: *persistv,
|
|
ServerURL: serverURL,
|
|
AuthKey: opts.AuthKey,
|
|
Hostinfo: hostinfo,
|
|
HTTPTestClient: httpTestClient,
|
|
DiscoPublicKey: discoPublic,
|
|
DebugFlags: debugFlags,
|
|
HealthTracker: b.health,
|
|
Pinger: b,
|
|
PopBrowserURL: b.tellClientToBrowseToURL,
|
|
OnClientVersion: b.onClientVersion,
|
|
OnTailnetDefaultAutoUpdate: b.onTailnetDefaultAutoUpdate,
|
|
OnControlTime: b.em.onControlTime,
|
|
Dialer: b.Dialer(),
|
|
Observer: b,
|
|
C2NHandler: http.HandlerFunc(b.handleC2N),
|
|
DialPlan: &b.dialPlan, // pointer because it can't be copied
|
|
ControlKnobs: b.sys.ControlKnobs(),
|
|
|
|
// Don't warn about broken Linux IP forwarding when
|
|
// netstack is being used.
|
|
SkipIPForwardingCheck: isNetstack,
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.setControlClientLocked(cc)
|
|
endpoints := b.endpoints
|
|
|
|
if err := b.initTKALocked(); err != nil {
|
|
b.logf("initTKALocked: %v", err)
|
|
}
|
|
var tkaHead string
|
|
if b.tka != nil {
|
|
head, err := b.tka.authority.Head().MarshalText()
|
|
if err != nil {
|
|
return fmt.Errorf("marshalling tka head: %w", err)
|
|
}
|
|
tkaHead = string(head)
|
|
}
|
|
confWantRunning := b.conf != nil && wantRunning
|
|
|
|
if endpoints != nil {
|
|
cc.UpdateEndpoints(endpoints)
|
|
}
|
|
cc.SetTKAHead(tkaHead)
|
|
|
|
blid := b.backendLogID.String()
|
|
b.logf("Backend: logs: be:%v fe:%v", blid, opts.FrontendLogID)
|
|
b.sendLocked(ipn.Notify{
|
|
BackendLogID: &blid,
|
|
Prefs: &prefs,
|
|
})
|
|
|
|
if !loggedOut && (b.hasNodeKeyLocked() || confWantRunning) {
|
|
// If we know that we're either logged in or meant to be
|
|
// running, tell the controlclient that it should also assume
|
|
// that we need to be logged in.
|
|
//
|
|
// Without this, the state machine transitions to "NeedsLogin" implying
|
|
// that user interaction is required, which is not the case and can
|
|
// regress tsnet.Server restarts.
|
|
cc.Login(nil, controlclient.LoginDefault)
|
|
}
|
|
b.stateMachineLockedOnEntry(unlock)
|
|
|
|
return nil
|
|
}
|
|
|
|
var warnInvalidUnsignedNodes = health.NewWarnable()
|
|
|
|
// updateFilterLocked updates the packet filter in wgengine based on the
|
|
// given netMap and user preferences.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) updateFilterLocked(netMap *netmap.NetworkMap, prefs ipn.PrefsView) {
|
|
// NOTE(danderson): keep change detection as the first thing in
|
|
// this function. Don't try to optimize by returning early, more
|
|
// likely than not you'll just end up breaking the change
|
|
// detection and end up with the wrong filter installed. This is
|
|
// quite hard to debug, so save yourself the trouble.
|
|
var (
|
|
haveNetmap = netMap != nil
|
|
addrs views.Slice[netip.Prefix]
|
|
packetFilter []filter.Match
|
|
localNetsB netipx.IPSetBuilder
|
|
logNetsB netipx.IPSetBuilder
|
|
shieldsUp = !prefs.Valid() || prefs.ShieldsUp() // Be conservative when not ready
|
|
)
|
|
// Log traffic for Tailscale IPs.
|
|
logNetsB.AddPrefix(tsaddr.CGNATRange())
|
|
logNetsB.AddPrefix(tsaddr.TailscaleULARange())
|
|
logNetsB.RemovePrefix(tsaddr.ChromeOSVMRange())
|
|
if haveNetmap {
|
|
addrs = netMap.GetAddresses()
|
|
for i := range addrs.Len() {
|
|
localNetsB.AddPrefix(addrs.At(i))
|
|
}
|
|
packetFilter = netMap.PacketFilter
|
|
|
|
if packetFilterPermitsUnlockedNodes(b.peers, packetFilter) {
|
|
err := errors.New("server sent invalid packet filter permitting traffic to unlocked nodes; rejecting all packets for safety")
|
|
b.health.SetWarnable(warnInvalidUnsignedNodes, err)
|
|
packetFilter = nil
|
|
} else {
|
|
b.health.SetWarnable(warnInvalidUnsignedNodes, nil)
|
|
}
|
|
}
|
|
if prefs.Valid() {
|
|
ar := prefs.AdvertiseRoutes()
|
|
for i := range ar.Len() {
|
|
r := ar.At(i)
|
|
if r.Bits() == 0 {
|
|
// When offering a default route to the world, we
|
|
// filter out locally reachable LANs, so that the
|
|
// default route effectively appears to be a "guest
|
|
// wifi": you get internet access, but to additionally
|
|
// get LAN access the LAN(s) need to be offered
|
|
// explicitly as well.
|
|
localInterfaceRoutes, hostIPs, err := interfaceRoutes()
|
|
if err != nil {
|
|
b.logf("getting local interface routes: %v", err)
|
|
continue
|
|
}
|
|
s, err := shrinkDefaultRoute(r, localInterfaceRoutes, hostIPs)
|
|
if err != nil {
|
|
b.logf("computing default route filter: %v", err)
|
|
continue
|
|
}
|
|
localNetsB.AddSet(s)
|
|
} else {
|
|
localNetsB.AddPrefix(r)
|
|
// When advertising a non-default route, we assume
|
|
// this is a corporate subnet that should be present
|
|
// in the audit logs.
|
|
logNetsB.AddPrefix(r)
|
|
}
|
|
}
|
|
|
|
// App connectors handle DNS requests for app domains over PeerAPI (corp#11961),
|
|
// but a safety check verifies the requesting peer has at least permission
|
|
// to send traffic to 0.0.0.0:53 (or 2000:: for IPv6) before handling the DNS
|
|
// request (see peerAPIHandler.replyToDNSQueries in peerapi.go).
|
|
// The correct filter rules are synthesized by the coordination server
|
|
// and sent down, but the address needs to be part of the 'local net' for the
|
|
// filter package to even bother checking the filter rules, so we set them here.
|
|
if prefs.AppConnector().Advertise {
|
|
localNetsB.Add(netip.MustParseAddr("0.0.0.0"))
|
|
localNetsB.Add(netip.MustParseAddr("::0"))
|
|
}
|
|
}
|
|
localNets, _ := localNetsB.IPSet()
|
|
logNets, _ := logNetsB.IPSet()
|
|
var sshPol tailcfg.SSHPolicy
|
|
if haveNetmap && netMap.SSHPolicy != nil {
|
|
sshPol = *netMap.SSHPolicy
|
|
}
|
|
|
|
changed := deephash.Update(&b.filterHash, &struct {
|
|
HaveNetmap bool
|
|
Addrs views.Slice[netip.Prefix]
|
|
FilterMatch []filter.Match
|
|
LocalNets []netipx.IPRange
|
|
LogNets []netipx.IPRange
|
|
ShieldsUp bool
|
|
SSHPolicy tailcfg.SSHPolicy
|
|
}{haveNetmap, addrs, packetFilter, localNets.Ranges(), logNets.Ranges(), shieldsUp, sshPol})
|
|
if !changed {
|
|
return
|
|
}
|
|
|
|
if !haveNetmap {
|
|
b.logf("[v1] netmap packet filter: (not ready yet)")
|
|
noneFilter := filter.NewAllowNone(b.logf, logNets)
|
|
b.setFilter(noneFilter)
|
|
b.e.SetJailedFilter(noneFilter)
|
|
return
|
|
}
|
|
|
|
oldFilter := b.e.GetFilter()
|
|
if shieldsUp {
|
|
b.logf("[v1] netmap packet filter: (shields up)")
|
|
b.setFilter(filter.NewShieldsUpFilter(localNets, logNets, oldFilter, b.logf))
|
|
} else {
|
|
b.logf("[v1] netmap packet filter: %v filters", len(packetFilter))
|
|
b.setFilter(filter.New(packetFilter, localNets, logNets, oldFilter, b.logf))
|
|
}
|
|
// The filter for a jailed node is the exact same as a ShieldsUp filter.
|
|
oldJailedFilter := b.e.GetJailedFilter()
|
|
b.e.SetJailedFilter(filter.NewShieldsUpFilter(localNets, logNets, oldJailedFilter, b.logf))
|
|
|
|
if b.sshServer != nil {
|
|
go b.sshServer.OnPolicyChange()
|
|
}
|
|
}
|
|
|
|
// packetFilterPermitsUnlockedNodes reports any peer in peers with the
|
|
// UnsignedPeerAPIOnly bool set true has any of its allowed IPs in the packet
|
|
// filter.
|
|
//
|
|
// If this reports true, the packet filter is invalid (the server is either broken
|
|
// or malicious) and should be ignored for safety.
|
|
func packetFilterPermitsUnlockedNodes(peers map[tailcfg.NodeID]tailcfg.NodeView, packetFilter []filter.Match) bool {
|
|
var b netipx.IPSetBuilder
|
|
var numUnlocked int
|
|
for _, p := range peers {
|
|
if !p.UnsignedPeerAPIOnly() {
|
|
continue
|
|
}
|
|
numUnlocked++
|
|
for i := range p.AllowedIPs().Len() { // not only addresses!
|
|
b.AddPrefix(p.AllowedIPs().At(i))
|
|
}
|
|
}
|
|
if numUnlocked == 0 {
|
|
return false
|
|
}
|
|
s, err := b.IPSet()
|
|
if err != nil {
|
|
// Shouldn't happen, but if it does, fail closed.
|
|
return true
|
|
}
|
|
for _, m := range packetFilter {
|
|
for _, r := range m.Srcs {
|
|
if !s.OverlapsPrefix(r) {
|
|
continue
|
|
}
|
|
if len(m.Dsts) != 0 {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) setFilter(f *filter.Filter) {
|
|
b.filterAtomic.Store(f)
|
|
b.e.SetFilter(f)
|
|
}
|
|
|
|
var removeFromDefaultRoute = []netip.Prefix{
|
|
// RFC1918 LAN ranges
|
|
netip.MustParsePrefix("192.168.0.0/16"),
|
|
netip.MustParsePrefix("172.16.0.0/12"),
|
|
netip.MustParsePrefix("10.0.0.0/8"),
|
|
// IPv4 link-local
|
|
netip.MustParsePrefix("169.254.0.0/16"),
|
|
// IPv4 multicast
|
|
netip.MustParsePrefix("224.0.0.0/4"),
|
|
// Tailscale IPv4 range
|
|
tsaddr.CGNATRange(),
|
|
// IPv6 Link-local addresses
|
|
netip.MustParsePrefix("fe80::/10"),
|
|
// IPv6 multicast
|
|
netip.MustParsePrefix("ff00::/8"),
|
|
// Tailscale IPv6 range
|
|
tsaddr.TailscaleULARange(),
|
|
}
|
|
|
|
// internalAndExternalInterfaces splits interface routes into "internal"
|
|
// and "external" sets. Internal routes are those of virtual ethernet
|
|
// network interfaces used by guest VMs and containers, such as WSL and
|
|
// Docker.
|
|
//
|
|
// Given that "internal" routes don't leave the device, we choose to
|
|
// trust them more, allowing access to them when an Exit Node is enabled.
|
|
func internalAndExternalInterfaces() (internal, external []netip.Prefix, err error) {
|
|
il, err := netmon.GetInterfaceList()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return internalAndExternalInterfacesFrom(il, runtime.GOOS)
|
|
}
|
|
|
|
func internalAndExternalInterfacesFrom(il netmon.InterfaceList, goos string) (internal, external []netip.Prefix, err error) {
|
|
// We use an IPSetBuilder here to canonicalize the prefixes
|
|
// and to remove any duplicate entries.
|
|
var internalBuilder, externalBuilder netipx.IPSetBuilder
|
|
if err := il.ForeachInterfaceAddress(func(iface netmon.Interface, pfx netip.Prefix) {
|
|
if tsaddr.IsTailscaleIP(pfx.Addr()) {
|
|
return
|
|
}
|
|
if pfx.IsSingleIP() {
|
|
return
|
|
}
|
|
if iface.IsLoopback() {
|
|
internalBuilder.AddPrefix(pfx)
|
|
return
|
|
}
|
|
if goos == "windows" {
|
|
// Windows Hyper-V prefixes all MAC addresses with 00:15:5d.
|
|
// https://docs.microsoft.com/en-us/troubleshoot/windows-server/virtualization/default-limit-256-dynamic-mac-addresses
|
|
//
|
|
// This includes WSL2 vEthernet.
|
|
// Importantly: by default WSL2 /etc/resolv.conf points to
|
|
// a stub resolver running on the host vEthernet IP.
|
|
// So enabling exit nodes with the default tailnet
|
|
// configuration breaks WSL2 DNS without this.
|
|
mac := iface.Interface.HardwareAddr
|
|
if len(mac) == 6 && mac[0] == 0x00 && mac[1] == 0x15 && mac[2] == 0x5d {
|
|
internalBuilder.AddPrefix(pfx)
|
|
return
|
|
}
|
|
}
|
|
externalBuilder.AddPrefix(pfx)
|
|
}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
iSet, err := internalBuilder.IPSet()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
eSet, err := externalBuilder.IPSet()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
return iSet.Prefixes(), eSet.Prefixes(), nil
|
|
}
|
|
|
|
func interfaceRoutes() (ips *netipx.IPSet, hostIPs []netip.Addr, err error) {
|
|
var b netipx.IPSetBuilder
|
|
if err := netmon.ForeachInterfaceAddress(func(_ netmon.Interface, pfx netip.Prefix) {
|
|
if tsaddr.IsTailscaleIP(pfx.Addr()) {
|
|
return
|
|
}
|
|
if pfx.IsSingleIP() {
|
|
return
|
|
}
|
|
hostIPs = append(hostIPs, pfx.Addr())
|
|
b.AddPrefix(pfx)
|
|
}); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
ipSet, _ := b.IPSet()
|
|
return ipSet, hostIPs, nil
|
|
}
|
|
|
|
// shrinkDefaultRoute returns an IPSet representing the IPs in route,
|
|
// minus those in removeFromDefaultRoute and localInterfaceRoutes,
|
|
// plus the IPs in hostIPs.
|
|
func shrinkDefaultRoute(route netip.Prefix, localInterfaceRoutes *netipx.IPSet, hostIPs []netip.Addr) (*netipx.IPSet, error) {
|
|
var b netipx.IPSetBuilder
|
|
// Add the default route.
|
|
b.AddPrefix(route)
|
|
// Remove the local interface routes.
|
|
b.RemoveSet(localInterfaceRoutes)
|
|
|
|
// Having removed all the LAN subnets, re-add the hosts's own
|
|
// IPs. It's fine for clients to connect to an exit node's public
|
|
// IP address, just not the attached subnet.
|
|
//
|
|
// Truly forbidden subnets (in removeFromDefaultRoute) will still
|
|
// be stripped back out by the next step.
|
|
for _, ip := range hostIPs {
|
|
if route.Contains(ip) {
|
|
b.Add(ip)
|
|
}
|
|
}
|
|
|
|
for _, pfx := range removeFromDefaultRoute {
|
|
b.RemovePrefix(pfx)
|
|
}
|
|
return b.IPSet()
|
|
}
|
|
|
|
// readPoller is a goroutine that receives service lists from
|
|
// b.portpoll and propagates them into the controlclient's HostInfo.
|
|
func (b *LocalBackend) readPoller() {
|
|
isFirst := true
|
|
ticker, tickerChannel := b.clock.NewTicker(portlist.PollInterval())
|
|
defer ticker.Stop()
|
|
initChan := make(chan struct{})
|
|
close(initChan)
|
|
for {
|
|
select {
|
|
case <-tickerChannel:
|
|
case <-b.ctx.Done():
|
|
return
|
|
case <-initChan:
|
|
// Preserving old behavior: readPoller should
|
|
// immediately poll the first time, then wait
|
|
// for a tick after.
|
|
initChan = nil
|
|
}
|
|
|
|
ports, changed, err := b.portpoll.Poll()
|
|
if err != nil {
|
|
b.logf("error polling for open ports: %v", err)
|
|
return
|
|
}
|
|
if !changed {
|
|
continue
|
|
}
|
|
sl := []tailcfg.Service{}
|
|
for _, p := range ports {
|
|
s := tailcfg.Service{
|
|
Proto: tailcfg.ServiceProto(p.Proto),
|
|
Port: p.Port,
|
|
Description: p.Process,
|
|
}
|
|
if policy.IsInterestingService(s, version.OS()) {
|
|
sl = append(sl, s)
|
|
}
|
|
}
|
|
|
|
b.mu.Lock()
|
|
if b.hostinfo == nil {
|
|
b.hostinfo = new(tailcfg.Hostinfo)
|
|
}
|
|
b.hostinfo.Services = sl
|
|
b.mu.Unlock()
|
|
|
|
b.doSetHostinfoFilterServices()
|
|
|
|
if isFirst {
|
|
isFirst = false
|
|
close(b.gotPortPollRes)
|
|
}
|
|
}
|
|
}
|
|
|
|
// GetPushDeviceToken returns the push notification device token.
|
|
func (b *LocalBackend) GetPushDeviceToken() string {
|
|
return b.pushDeviceToken.Load()
|
|
}
|
|
|
|
// SetPushDeviceToken sets the push notification device token and informs the
|
|
// controlclient of the new value.
|
|
func (b *LocalBackend) SetPushDeviceToken(tk string) {
|
|
old := b.pushDeviceToken.Swap(tk)
|
|
if old == tk {
|
|
return
|
|
}
|
|
b.doSetHostinfoFilterServices()
|
|
}
|
|
|
|
func applyConfigToHostinfo(hi *tailcfg.Hostinfo, c *conffile.Config) {
|
|
if c == nil {
|
|
return
|
|
}
|
|
if c.Parsed.Hostname != nil {
|
|
hi.Hostname = *c.Parsed.Hostname
|
|
}
|
|
}
|
|
|
|
// WatchNotifications subscribes to the ipn.Notify message bus notification
|
|
// messages.
|
|
//
|
|
// WatchNotifications blocks until ctx is done.
|
|
//
|
|
// The provided onWatchAdded, if non-nil, will be called once the watcher
|
|
// is installed.
|
|
//
|
|
// The provided fn will be called for each notification. It will only be
|
|
// called with non-nil pointers. The caller must not modify roNotify. If
|
|
// fn returns false, the watch also stops.
|
|
//
|
|
// Failure to consume many notifications in a row will result in dropped
|
|
// notifications. There is currently (2022-11-22) no mechanism provided to
|
|
// detect when a message has been dropped.
|
|
func (b *LocalBackend) WatchNotifications(ctx context.Context, mask ipn.NotifyWatchOpt, onWatchAdded func(), fn func(roNotify *ipn.Notify) (keepGoing bool)) {
|
|
ch := make(chan *ipn.Notify, 128)
|
|
|
|
sessionID := rands.HexString(16)
|
|
|
|
origFn := fn
|
|
if mask&ipn.NotifyNoPrivateKeys != 0 {
|
|
fn = func(n *ipn.Notify) bool {
|
|
if n.NetMap == nil || n.NetMap.PrivateKey.IsZero() {
|
|
return origFn(n)
|
|
}
|
|
|
|
// The netmap in n is shared across all watchers, so to mutate it for a
|
|
// single watcher we have to clone the notify and the netmap. We can
|
|
// make shallow clones, at least.
|
|
nm2 := *n.NetMap
|
|
n2 := *n
|
|
n2.NetMap = &nm2
|
|
n2.NetMap.PrivateKey = key.NodePrivate{}
|
|
return origFn(&n2)
|
|
}
|
|
}
|
|
|
|
var ini *ipn.Notify
|
|
|
|
b.mu.Lock()
|
|
|
|
const initialBits = ipn.NotifyInitialState | ipn.NotifyInitialPrefs | ipn.NotifyInitialNetMap | ipn.NotifyInitialDriveShares
|
|
if mask&initialBits != 0 {
|
|
ini = &ipn.Notify{Version: version.Long()}
|
|
if mask&ipn.NotifyInitialState != 0 {
|
|
ini.SessionID = sessionID
|
|
ini.State = ptr.To(b.state)
|
|
if b.state == ipn.NeedsLogin && b.authURL != "" {
|
|
ini.BrowseToURL = ptr.To(b.authURL)
|
|
}
|
|
}
|
|
if mask&ipn.NotifyInitialPrefs != 0 {
|
|
ini.Prefs = ptr.To(b.sanitizedPrefsLocked())
|
|
}
|
|
if mask&ipn.NotifyInitialNetMap != 0 {
|
|
ini.NetMap = b.netMap
|
|
}
|
|
if mask&ipn.NotifyInitialDriveShares != 0 && b.driveSharingEnabledLocked() {
|
|
ini.DriveShares = b.pm.prefs.DriveShares()
|
|
}
|
|
}
|
|
|
|
mak.Set(&b.notifyWatchers, sessionID, &watchSession{ch, sessionID})
|
|
b.mu.Unlock()
|
|
|
|
defer func() {
|
|
b.mu.Lock()
|
|
delete(b.notifyWatchers, sessionID)
|
|
b.mu.Unlock()
|
|
}()
|
|
|
|
if onWatchAdded != nil {
|
|
onWatchAdded()
|
|
}
|
|
|
|
if ini != nil {
|
|
if !fn(ini) {
|
|
return
|
|
}
|
|
}
|
|
|
|
// The GUI clients want to know when peers become active or inactive.
|
|
// They've historically got this information by polling for it, which is
|
|
// wasteful. As a step towards making it efficient, they now set this
|
|
// NotifyWatchEngineUpdates bit to ask for us to send it to them only on
|
|
// change. That's not yet (as of 2022-11-26) plumbed everywhere in
|
|
// tailscaled yet, so just do the polling here. This ends up causing all IPN
|
|
// bus watchers to get the notification every 2 seconds instead of just the
|
|
// GUI client's bus watcher, but in practice there's only 1 total connection
|
|
// anyway. And if we're polling, at least the client isn't making a new HTTP
|
|
// request every 2 seconds.
|
|
// TODO(bradfitz): plumb this further and only send a Notify on change.
|
|
if mask&ipn.NotifyWatchEngineUpdates != 0 {
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
defer cancel()
|
|
go b.pollRequestEngineStatus(ctx)
|
|
}
|
|
|
|
// TODO(marwan-at-work): check err
|
|
// TODO(marwan-at-work): streaming background logs?
|
|
defer b.DeleteForegroundSession(sessionID)
|
|
|
|
var lastURLPop string // to dup suppress URL popups
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
case n, ok := <-ch:
|
|
// URLs flow into Notify.BrowseToURL via two means:
|
|
// 1. From MapResponse.PopBrowserURL, which already says they're dup
|
|
// suppressed if identical, and that's done by the controlclient,
|
|
// so this added later adds nothing.
|
|
//
|
|
// 2. From the controlclient auth routes, on register. This makes sure
|
|
// we don't tell clients (mac, windows, android) to pop the same URL
|
|
// multiple times.
|
|
if n != nil && n.BrowseToURL != nil {
|
|
if v := *n.BrowseToURL; v == lastURLPop {
|
|
n.BrowseToURL = nil
|
|
} else {
|
|
lastURLPop = v
|
|
}
|
|
}
|
|
if !ok || !fn(n) {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// pollRequestEngineStatus calls b.e.RequestStatus every 2 seconds until ctx
|
|
// is done.
|
|
func (b *LocalBackend) pollRequestEngineStatus(ctx context.Context) {
|
|
ticker, tickerChannel := b.clock.NewTicker(2 * time.Second)
|
|
defer ticker.Stop()
|
|
for {
|
|
select {
|
|
case <-tickerChannel:
|
|
b.e.RequestStatus()
|
|
case <-ctx.Done():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// DebugNotify injects a fake notify message to clients.
|
|
//
|
|
// It should only be used via the LocalAPI's debug handler.
|
|
func (b *LocalBackend) DebugNotify(n ipn.Notify) {
|
|
b.send(n)
|
|
}
|
|
|
|
// DebugNotifyLastNetMap injects a fake notify message to clients,
|
|
// repeating whatever the last netmap was.
|
|
//
|
|
// It should only be used via the LocalAPI's debug handler.
|
|
func (b *LocalBackend) DebugNotifyLastNetMap() {
|
|
b.mu.Lock()
|
|
nm := b.netMap
|
|
b.mu.Unlock()
|
|
|
|
if nm != nil {
|
|
b.send(ipn.Notify{NetMap: nm})
|
|
}
|
|
}
|
|
|
|
// DebugForceNetmapUpdate forces a full no-op netmap update of the current
|
|
// netmap in all the various subsystems (wireguard, magicsock, LocalBackend).
|
|
//
|
|
// It exists for load testing reasons (for issue 1909), doing what would happen
|
|
// if a new MapResponse came in from the control server that couldn't be handled
|
|
// incrementally.
|
|
func (b *LocalBackend) DebugForceNetmapUpdate() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
nm := b.netMap
|
|
b.e.SetNetworkMap(nm)
|
|
if nm != nil {
|
|
b.MagicConn().SetDERPMap(nm.DERPMap)
|
|
}
|
|
b.setNetMapLocked(nm)
|
|
}
|
|
|
|
// DebugPickNewDERP forwards to magicsock.Conn.DebugPickNewDERP.
|
|
// See its docs.
|
|
func (b *LocalBackend) DebugPickNewDERP() error {
|
|
return b.sys.MagicSock.Get().DebugPickNewDERP()
|
|
}
|
|
|
|
// send delivers n to the connected frontend and any API watchers from
|
|
// LocalBackend.WatchNotifications (via the LocalAPI).
|
|
//
|
|
// If no frontend is connected or API watchers are backed up, the notification
|
|
// is dropped without being delivered.
|
|
//
|
|
// If n contains Prefs, those will be sanitized before being delivered.
|
|
//
|
|
// b.mu must not be held.
|
|
func (b *LocalBackend) send(n ipn.Notify) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.sendLocked(n)
|
|
}
|
|
|
|
// sendLocked is like send, but assumes b.mu is already held.
|
|
func (b *LocalBackend) sendLocked(n ipn.Notify) {
|
|
if n.Prefs != nil {
|
|
n.Prefs = ptr.To(stripKeysFromPrefs(*n.Prefs))
|
|
}
|
|
if n.Version == "" {
|
|
n.Version = version.Long()
|
|
}
|
|
|
|
apiSrv := b.peerAPIServer
|
|
if mayDeref(apiSrv).taildrop.HasFilesWaiting() {
|
|
n.FilesWaiting = &empty.Message{}
|
|
}
|
|
|
|
for _, sess := range b.notifyWatchers {
|
|
select {
|
|
case sess.ch <- &n:
|
|
default:
|
|
// Drop the notification if the channel is full.
|
|
}
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) sendFileNotify() {
|
|
var n ipn.Notify
|
|
|
|
b.mu.Lock()
|
|
for _, wakeWaiter := range b.fileWaiters {
|
|
wakeWaiter()
|
|
}
|
|
apiSrv := b.peerAPIServer
|
|
if apiSrv == nil {
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
|
|
// Make sure we always set n.IncomingFiles non-nil so it gets encoded
|
|
// in JSON to clients. They distinguish between empty and non-nil
|
|
// to know whether a Notify should be able about files.
|
|
n.IncomingFiles = apiSrv.taildrop.IncomingFiles()
|
|
b.mu.Unlock()
|
|
|
|
sort.Slice(n.IncomingFiles, func(i, j int) bool {
|
|
return n.IncomingFiles[i].Started.Before(n.IncomingFiles[j].Started)
|
|
})
|
|
|
|
b.send(n)
|
|
}
|
|
|
|
// popBrowserAuthNow shuts down the data plane and sends an auth URL
|
|
// to the connected frontend, if any.
|
|
func (b *LocalBackend) popBrowserAuthNow() {
|
|
b.mu.Lock()
|
|
url := b.authURL
|
|
expired := b.keyExpired
|
|
b.mu.Unlock()
|
|
|
|
b.logf("popBrowserAuthNow: url=%v, key-expired=%v, seamless-key-renewal=%v", url != "", expired, b.seamlessRenewalEnabled())
|
|
|
|
// Deconfigure the local network data plane if:
|
|
// - seamless key renewal is not enabled;
|
|
// - key is expired (in which case tailnet connectivity is down anyway).
|
|
if !b.seamlessRenewalEnabled() || expired {
|
|
b.blockEngineUpdates(true)
|
|
b.stopEngineAndWait()
|
|
}
|
|
b.tellClientToBrowseToURL(url)
|
|
if b.State() == ipn.Running {
|
|
b.enterState(ipn.Starting)
|
|
}
|
|
}
|
|
|
|
// validPopBrowserURL reports whether urlStr is a valid value for a
|
|
// control server to send in a *URL field.
|
|
//
|
|
// b.mu must *not* be held.
|
|
func (b *LocalBackend) validPopBrowserURL(urlStr string) bool {
|
|
if urlStr == "" {
|
|
return false
|
|
}
|
|
u, err := url.Parse(urlStr)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
serverURL := b.Prefs().ControlURLOrDefault()
|
|
if ipn.IsLoginServerSynonym(serverURL) {
|
|
// When connected to the official Tailscale control plane, only allow
|
|
// URLs from tailscale.com or its subdomains.
|
|
if h := u.Hostname(); h != "tailscale.com" && !strings.HasSuffix(u.Hostname(), ".tailscale.com") {
|
|
return false
|
|
}
|
|
// When using a different ControlURL, we cannot be sure what legitimate
|
|
// PopBrowserURLs they will send. Allow any domain there to avoid
|
|
// breaking existing user setups.
|
|
}
|
|
switch u.Scheme {
|
|
case "https":
|
|
return true
|
|
case "http":
|
|
// If the control server is using plain HTTP (likely a dev server),
|
|
// then permit http://.
|
|
return strings.HasPrefix(serverURL, "http://")
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) tellClientToBrowseToURL(url string) {
|
|
if b.validPopBrowserURL(url) {
|
|
b.send(ipn.Notify{BrowseToURL: &url})
|
|
}
|
|
}
|
|
|
|
// onClientVersion is called on MapResponse updates when a MapResponse contains
|
|
// a non-nil ClientVersion message.
|
|
func (b *LocalBackend) onClientVersion(v *tailcfg.ClientVersion) {
|
|
b.mu.Lock()
|
|
b.lastClientVersion = v
|
|
b.health.SetLatestVersion(v)
|
|
b.mu.Unlock()
|
|
b.send(ipn.Notify{ClientVersion: v})
|
|
}
|
|
|
|
func (b *LocalBackend) onTailnetDefaultAutoUpdate(au bool) {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
prefs := b.pm.CurrentPrefs()
|
|
if !prefs.Valid() {
|
|
b.logf("[unexpected]: received tailnet default auto-update callback but current prefs are nil")
|
|
return
|
|
}
|
|
if _, ok := prefs.AutoUpdate().Apply.Get(); ok {
|
|
// Apply was already set from a previous default or manually by the
|
|
// user. Tailnet default should not affect us, even if it changes.
|
|
return
|
|
}
|
|
b.logf("using tailnet default auto-update setting: %v", au)
|
|
prefsClone := prefs.AsStruct()
|
|
prefsClone.AutoUpdate.Apply = opt.NewBool(au)
|
|
_, err := b.editPrefsLockedOnEntry(&ipn.MaskedPrefs{
|
|
Prefs: *prefsClone,
|
|
AutoUpdateSet: ipn.AutoUpdatePrefsMask{
|
|
ApplySet: true,
|
|
},
|
|
}, unlock)
|
|
if err != nil {
|
|
b.logf("failed to apply tailnet-wide default for auto-updates (%v): %v", au, err)
|
|
return
|
|
}
|
|
}
|
|
|
|
// For testing lazy machine key generation.
|
|
var panicOnMachineKeyGeneration = envknob.RegisterBool("TS_DEBUG_PANIC_MACHINE_KEY")
|
|
|
|
func (b *LocalBackend) createGetMachinePrivateKeyFunc() func() (key.MachinePrivate, error) {
|
|
var cache syncs.AtomicValue[key.MachinePrivate]
|
|
return func() (key.MachinePrivate, error) {
|
|
if panicOnMachineKeyGeneration() {
|
|
panic("machine key generated")
|
|
}
|
|
if v, ok := cache.LoadOk(); ok {
|
|
return v, nil
|
|
}
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if v, ok := cache.LoadOk(); ok {
|
|
return v, nil
|
|
}
|
|
if err := b.initMachineKeyLocked(); err != nil {
|
|
return key.MachinePrivate{}, err
|
|
}
|
|
cache.Store(b.machinePrivKey)
|
|
return b.machinePrivKey, nil
|
|
}
|
|
}
|
|
|
|
// initMachineKeyLocked is called to initialize b.machinePrivKey.
|
|
//
|
|
// b.prefs must already be initialized.
|
|
// b.stateKey should be set too, but just for nicer log messages.
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) initMachineKeyLocked() (err error) {
|
|
if !b.machinePrivKey.IsZero() {
|
|
// Already set.
|
|
return nil
|
|
}
|
|
|
|
var legacyMachineKey key.MachinePrivate
|
|
if p := b.pm.CurrentPrefs().Persist(); p.Valid() {
|
|
legacyMachineKey = p.LegacyFrontendPrivateMachineKey()
|
|
}
|
|
|
|
keyText, err := b.store.ReadState(ipn.MachineKeyStateKey)
|
|
if err == nil {
|
|
if err := b.machinePrivKey.UnmarshalText(keyText); err != nil {
|
|
return fmt.Errorf("invalid key in %s key of %v: %w", ipn.MachineKeyStateKey, b.store, err)
|
|
}
|
|
if b.machinePrivKey.IsZero() {
|
|
return fmt.Errorf("invalid zero key stored in %v key of %v", ipn.MachineKeyStateKey, b.store)
|
|
}
|
|
if !legacyMachineKey.IsZero() && !legacyMachineKey.Equal(b.machinePrivKey) {
|
|
b.logf("frontend-provided legacy machine key ignored; used value from server state")
|
|
}
|
|
return nil
|
|
}
|
|
if err != ipn.ErrStateNotExist {
|
|
return fmt.Errorf("error reading %v key of %v: %w", ipn.MachineKeyStateKey, b.store, err)
|
|
}
|
|
|
|
// If we didn't find one already on disk and the prefs already
|
|
// have a legacy machine key, use that. Otherwise generate a
|
|
// new one.
|
|
if !legacyMachineKey.IsZero() {
|
|
b.machinePrivKey = legacyMachineKey
|
|
} else {
|
|
b.logf("generating new machine key")
|
|
b.machinePrivKey = key.NewMachine()
|
|
}
|
|
|
|
keyText, _ = b.machinePrivKey.MarshalText()
|
|
if err := ipn.WriteState(b.store, ipn.MachineKeyStateKey, keyText); err != nil {
|
|
b.logf("error writing machine key to store: %v", err)
|
|
return err
|
|
}
|
|
|
|
b.logf("machine key written to store")
|
|
return nil
|
|
}
|
|
|
|
// clearMachineKeyLocked is called to clear the persisted and in-memory
|
|
// machine key, so that initMachineKeyLocked (called as part of starting)
|
|
// generates a new machine key.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) clearMachineKeyLocked() error {
|
|
if err := ipn.WriteState(b.store, ipn.MachineKeyStateKey, nil); err != nil {
|
|
return err
|
|
}
|
|
b.machinePrivKey = key.MachinePrivate{}
|
|
b.logf("machine key cleared")
|
|
return nil
|
|
}
|
|
|
|
// setTCPPortsIntercepted populates b.shouldInterceptTCPPortAtomic with an
|
|
// efficient func for ShouldInterceptTCPPort to use, which is called on every
|
|
// incoming packet.
|
|
func (b *LocalBackend) setTCPPortsIntercepted(ports []uint16) {
|
|
slices.Sort(ports)
|
|
uniq.ModifySlice(&ports)
|
|
var f func(uint16) bool
|
|
switch len(ports) {
|
|
case 0:
|
|
f = func(uint16) bool { return false }
|
|
case 1:
|
|
f = func(p uint16) bool { return ports[0] == p }
|
|
case 2:
|
|
f = func(p uint16) bool { return ports[0] == p || ports[1] == p }
|
|
case 3:
|
|
f = func(p uint16) bool { return ports[0] == p || ports[1] == p || ports[2] == p }
|
|
default:
|
|
if len(ports) > 16 {
|
|
m := map[uint16]bool{}
|
|
for _, p := range ports {
|
|
m[p] = true
|
|
}
|
|
f = func(p uint16) bool { return m[p] }
|
|
} else {
|
|
f = func(p uint16) bool {
|
|
for _, x := range ports {
|
|
if p == x {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
b.shouldInterceptTCPPortAtomic.Store(f)
|
|
}
|
|
|
|
// setAtomicValuesFromPrefsLocked populates sshAtomicBool, containsViaIPFuncAtomic,
|
|
// shouldInterceptTCPPortAtomic, and exposeRemoteWebClientAtomicBool from the prefs p,
|
|
// which may be !Valid().
|
|
func (b *LocalBackend) setAtomicValuesFromPrefsLocked(p ipn.PrefsView) {
|
|
b.sshAtomicBool.Store(p.Valid() && p.RunSSH() && envknob.CanSSHD())
|
|
b.setExposeRemoteWebClientAtomicBoolLocked(p)
|
|
|
|
if !p.Valid() {
|
|
b.containsViaIPFuncAtomic.Store(tsaddr.FalseContainsIPFunc())
|
|
b.setTCPPortsIntercepted(nil)
|
|
b.lastServeConfJSON = mem.B(nil)
|
|
b.serveConfig = ipn.ServeConfigView{}
|
|
} else {
|
|
filtered := tsaddr.FilterPrefixesCopy(p.AdvertiseRoutes(), tsaddr.IsViaPrefix)
|
|
b.containsViaIPFuncAtomic.Store(tsaddr.NewContainsIPFunc(views.SliceOf(filtered)))
|
|
b.setTCPPortsInterceptedFromNetmapAndPrefsLocked(p)
|
|
}
|
|
}
|
|
|
|
// State returns the backend state machine's current state.
|
|
func (b *LocalBackend) State() ipn.State {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
return b.state
|
|
}
|
|
|
|
// InServerMode reports whether the Tailscale backend is explicitly running in
|
|
// "server mode" where it continues to run despite whatever the platform's
|
|
// default is. In practice, this is only used on Windows, where the default
|
|
// tailscaled behavior is to shut down whenever the GUI disconnects.
|
|
//
|
|
// On non-Windows platforms, this usually returns false (because people don't
|
|
// set unattended mode on other platforms) and also isn't checked on other
|
|
// platforms.
|
|
//
|
|
// TODO(bradfitz): rename to InWindowsUnattendedMode or something? Or make this
|
|
// return true on Linux etc and always be called? It's kinda messy now.
|
|
func (b *LocalBackend) InServerMode() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.pm.CurrentPrefs().ForceDaemon()
|
|
}
|
|
|
|
// CheckIPNConnectionAllowed returns an error if the identity in ci should not
|
|
// be allowed to connect or make requests to the LocalAPI currently.
|
|
//
|
|
// Currently (as of 2022-11-23), this is only used on Windows to check if
|
|
// we started in server mode and ci is from an identity other than the one
|
|
// that started the server.
|
|
func (b *LocalBackend) CheckIPNConnectionAllowed(ci *ipnauth.ConnIdentity) error {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
serverModeUid := b.pm.CurrentUserID()
|
|
if serverModeUid == "" {
|
|
// Either this platform isn't a "multi-user" platform or we're not yet
|
|
// running as one.
|
|
return nil
|
|
}
|
|
if !b.pm.CurrentPrefs().ForceDaemon() {
|
|
return nil
|
|
}
|
|
|
|
// Always allow Windows SYSTEM user to connect,
|
|
// even if Tailscale is currently being used by another user.
|
|
if tok, err := ci.WindowsToken(); err == nil {
|
|
defer tok.Close()
|
|
if tok.IsLocalSystem() {
|
|
return nil
|
|
}
|
|
}
|
|
|
|
uid := ci.WindowsUserID()
|
|
if uid == "" {
|
|
return errors.New("empty user uid in connection identity")
|
|
}
|
|
if uid != serverModeUid {
|
|
return fmt.Errorf("Tailscale running in server mode (%q); connection from %q not allowed", b.tryLookupUserName(string(serverModeUid)), b.tryLookupUserName(string(uid)))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// tryLookupUserName tries to look up the username for the uid.
|
|
// It returns the username on success, or the UID on failure.
|
|
func (b *LocalBackend) tryLookupUserName(uid string) string {
|
|
u, err := ipnauth.LookupUserFromID(b.logf, uid)
|
|
if err != nil {
|
|
return uid
|
|
}
|
|
return u.Username
|
|
}
|
|
|
|
// StartLoginInteractive requests a new interactive login from controlclient,
|
|
// unless such a flow is already in progress, in which case
|
|
// StartLoginInteractive attempts to pick up the in-progress flow where it left
|
|
// off.
|
|
func (b *LocalBackend) StartLoginInteractive(ctx context.Context) error {
|
|
b.mu.Lock()
|
|
if b.cc == nil {
|
|
panic("LocalBackend.assertClient: b.cc == nil")
|
|
}
|
|
url := b.authURL
|
|
timeSinceAuthURLCreated := b.clock.Since(b.authURLTime)
|
|
cc := b.cc
|
|
b.mu.Unlock()
|
|
b.logf("StartLoginInteractive: url=%v", url != "")
|
|
|
|
// Only use an authURL if it was sent down from control in the last
|
|
// 6 days and 23 hours. Avoids using a stale URL that is no longer valid
|
|
// server-side. Server-side URLs expire after 7 days.
|
|
if url != "" && timeSinceAuthURLCreated < ((7*24*time.Hour)-(1*time.Hour)) {
|
|
b.popBrowserAuthNow()
|
|
} else {
|
|
cc.Login(nil, b.loginFlags|controlclient.LoginInteractive)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) Ping(ctx context.Context, ip netip.Addr, pingType tailcfg.PingType, size int) (*ipnstate.PingResult, error) {
|
|
if pingType == tailcfg.PingPeerAPI {
|
|
t0 := b.clock.Now()
|
|
node, base, err := b.pingPeerAPI(ctx, ip)
|
|
if err != nil && ctx.Err() != nil {
|
|
return nil, ctx.Err()
|
|
}
|
|
d := b.clock.Since(t0)
|
|
pr := &ipnstate.PingResult{
|
|
IP: ip.String(),
|
|
NodeIP: ip.String(),
|
|
LatencySeconds: d.Seconds(),
|
|
PeerAPIURL: base,
|
|
}
|
|
if err != nil {
|
|
pr.Err = err.Error()
|
|
}
|
|
if node.Valid() {
|
|
pr.NodeName = node.Name()
|
|
}
|
|
return pr, nil
|
|
}
|
|
ch := make(chan *ipnstate.PingResult, 1)
|
|
b.e.Ping(ip, pingType, size, func(pr *ipnstate.PingResult) {
|
|
select {
|
|
case ch <- pr:
|
|
default:
|
|
}
|
|
})
|
|
select {
|
|
case pr := <-ch:
|
|
return pr, nil
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) pingPeerAPI(ctx context.Context, ip netip.Addr) (peer tailcfg.NodeView, peerBase string, err error) {
|
|
var zero tailcfg.NodeView
|
|
ctx, cancel := context.WithTimeout(ctx, 10*time.Second)
|
|
defer cancel()
|
|
nm := b.NetMap()
|
|
if nm == nil {
|
|
return zero, "", errors.New("no netmap")
|
|
}
|
|
peer, ok := nm.PeerByTailscaleIP(ip)
|
|
if !ok {
|
|
return zero, "", fmt.Errorf("no peer found with Tailscale IP %v", ip)
|
|
}
|
|
if peer.Expired() {
|
|
return zero, "", errors.New("peer's node key has expired")
|
|
}
|
|
base := peerAPIBase(nm, peer)
|
|
if base == "" {
|
|
return zero, "", fmt.Errorf("no PeerAPI base found for peer %v (%v)", peer.ID(), ip)
|
|
}
|
|
outReq, err := http.NewRequestWithContext(ctx, "HEAD", base, nil)
|
|
if err != nil {
|
|
return zero, "", err
|
|
}
|
|
tr := b.Dialer().PeerAPITransport()
|
|
res, err := tr.RoundTrip(outReq)
|
|
if err != nil {
|
|
return zero, "", err
|
|
}
|
|
defer res.Body.Close() // but unnecessary on HEAD responses
|
|
if res.StatusCode != http.StatusOK {
|
|
return zero, "", fmt.Errorf("HTTP status %v", res.Status)
|
|
}
|
|
return peer, base, nil
|
|
}
|
|
|
|
// parseWgStatusLocked returns an EngineStatus based on s.
|
|
//
|
|
// b.mu must be held; mostly because the caller is about to anyway, and doing so
|
|
// gives us slightly better guarantees about the two peers stats lines not
|
|
// being intermixed if there are concurrent calls to our caller.
|
|
func (b *LocalBackend) parseWgStatusLocked(s *wgengine.Status) (ret ipn.EngineStatus) {
|
|
var peerStats, peerKeys strings.Builder
|
|
|
|
ret.LiveDERPs = s.DERPs
|
|
ret.LivePeers = map[key.NodePublic]ipnstate.PeerStatusLite{}
|
|
for _, p := range s.Peers {
|
|
if !p.LastHandshake.IsZero() {
|
|
fmt.Fprintf(&peerStats, "%d/%d ", p.RxBytes, p.TxBytes)
|
|
fmt.Fprintf(&peerKeys, "%s ", p.NodeKey.ShortString())
|
|
|
|
ret.NumLive++
|
|
ret.LivePeers[p.NodeKey] = p
|
|
|
|
}
|
|
ret.RBytes += p.RxBytes
|
|
ret.WBytes += p.TxBytes
|
|
}
|
|
|
|
// [GRINDER STATS LINES] - please don't remove (used for log parsing)
|
|
if peerStats.Len() > 0 {
|
|
b.keyLogf("[v1] peer keys: %s", strings.TrimSpace(peerKeys.String()))
|
|
b.statsLogf("[v1] v%v peers: %v", version.Long(), strings.TrimSpace(peerStats.String()))
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// shouldUploadServices reports whether this node should include services
|
|
// in Hostinfo. When the user preferences currently request "shields up"
|
|
// mode, all inbound connections are refused, so services are not reported.
|
|
// Otherwise, shouldUploadServices respects NetMap.CollectServices.
|
|
func (b *LocalBackend) shouldUploadServices() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
p := b.pm.CurrentPrefs()
|
|
if !p.Valid() || b.netMap == nil {
|
|
return false // default to safest setting
|
|
}
|
|
return !p.ShieldsUp() && b.netMap.CollectServices
|
|
}
|
|
|
|
// SetCurrentUser is used to implement support for multi-user systems (only
|
|
// Windows 2022-11-25). On such systems, the uid is used to determine which
|
|
// user's state should be used. The current user is maintained by active
|
|
// connections open to the backend.
|
|
//
|
|
// When the backend initially starts it will typically start with no user. Then,
|
|
// the first connection to the backend from the GUI frontend will set the
|
|
// current user. Once set, the current user cannot be changed until all previous
|
|
// connections are closed. The user is also used to determine which
|
|
// LoginProfiles are accessible.
|
|
//
|
|
// In unattended mode, the backend will start with the user which enabled
|
|
// unattended mode. The user must disable unattended mode before the user can be
|
|
// changed.
|
|
//
|
|
// On non-multi-user systems, the token should be set to nil.
|
|
//
|
|
// SetCurrentUser returns the ipn.WindowsUserID associated with token
|
|
// when successful.
|
|
func (b *LocalBackend) SetCurrentUser(token ipnauth.WindowsToken) (ipn.WindowsUserID, error) {
|
|
var uid ipn.WindowsUserID
|
|
if token != nil {
|
|
var err error
|
|
uid, err = token.UID()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
}
|
|
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
if b.pm.CurrentUserID() == uid {
|
|
return uid, nil
|
|
}
|
|
if err := b.pm.SetCurrentUserID(uid); err != nil {
|
|
return uid, nil
|
|
}
|
|
if b.currentUser != nil {
|
|
b.currentUser.Close()
|
|
}
|
|
b.currentUser = token
|
|
b.resetForProfileChangeLockedOnEntry(unlock)
|
|
return uid, nil
|
|
}
|
|
|
|
func (b *LocalBackend) CheckPrefs(p *ipn.Prefs) error {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.checkPrefsLocked(p)
|
|
}
|
|
|
|
// isConfigLocked_Locked reports whether the parsed config file is locked.
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) isConfigLocked_Locked() bool {
|
|
// TODO(bradfitz,maisem): make this more fine-grained, permit changing
|
|
// some things if they're not explicitly set in the config. But for now
|
|
// (2023-10-16), just blanket disable everything.
|
|
return b.conf != nil && !b.conf.Parsed.Locked.EqualBool(false)
|
|
}
|
|
|
|
func (b *LocalBackend) checkPrefsLocked(p *ipn.Prefs) error {
|
|
if b.isConfigLocked_Locked() {
|
|
return errors.New("can't reconfigure tailscaled when using a config file; config file is locked")
|
|
}
|
|
var errs []error
|
|
if p.Hostname == "badhostname.tailscale." {
|
|
// Keep this one just for testing.
|
|
errs = append(errs, errors.New("bad hostname [test]"))
|
|
}
|
|
if err := b.checkProfileNameLocked(p); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
if err := b.checkSSHPrefsLocked(p); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
if err := b.checkExitNodePrefsLocked(p); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
if err := b.checkFunnelEnabledLocked(p); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
if err := b.checkAutoUpdatePrefsLocked(p); err != nil {
|
|
errs = append(errs, err)
|
|
}
|
|
return multierr.New(errs...)
|
|
}
|
|
|
|
func (b *LocalBackend) checkSSHPrefsLocked(p *ipn.Prefs) error {
|
|
if !p.RunSSH {
|
|
return nil
|
|
}
|
|
if err := envknob.CanRunTailscaleSSH(); err != nil {
|
|
return err
|
|
}
|
|
if runtime.GOOS == "linux" {
|
|
b.updateSELinuxHealthWarning()
|
|
}
|
|
if envknob.SSHIgnoreTailnetPolicy() || envknob.SSHPolicyFile() != "" {
|
|
return nil
|
|
}
|
|
if b.netMap != nil {
|
|
if !b.netMap.HasCap(tailcfg.CapabilitySSH) {
|
|
if b.isDefaultServerLocked() {
|
|
return errors.New("Unable to enable local Tailscale SSH server; not enabled on Tailnet. See https://tailscale.com/s/ssh")
|
|
}
|
|
return errors.New("Unable to enable local Tailscale SSH server; not enabled on Tailnet.")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) sshOnButUnusableHealthCheckMessageLocked() (healthMessage string) {
|
|
if p := b.pm.CurrentPrefs(); !p.Valid() || !p.RunSSH() {
|
|
return ""
|
|
}
|
|
if envknob.SSHIgnoreTailnetPolicy() || envknob.SSHPolicyFile() != "" {
|
|
return "development SSH policy in use"
|
|
}
|
|
nm := b.netMap
|
|
if nm == nil {
|
|
return ""
|
|
}
|
|
if nm.SSHPolicy != nil && len(nm.SSHPolicy.Rules) > 0 {
|
|
return ""
|
|
}
|
|
isDefault := b.isDefaultServerLocked()
|
|
|
|
if !nm.HasCap(tailcfg.CapabilityAdmin) {
|
|
return healthmsg.TailscaleSSHOnBut + "access controls don't allow anyone to access this device. Ask your admin to update your tailnet's ACLs to allow access."
|
|
}
|
|
if !isDefault {
|
|
return healthmsg.TailscaleSSHOnBut + "access controls don't allow anyone to access this device. Update your tailnet's ACLs to allow access."
|
|
}
|
|
return healthmsg.TailscaleSSHOnBut + "access controls don't allow anyone to access this device. Update your tailnet's ACLs at https://tailscale.com/s/ssh-policy"
|
|
}
|
|
|
|
func (b *LocalBackend) isDefaultServerLocked() bool {
|
|
prefs := b.pm.CurrentPrefs()
|
|
if !prefs.Valid() {
|
|
return true // assume true until set otherwise
|
|
}
|
|
return prefs.ControlURLOrDefault() == ipn.DefaultControlURL
|
|
}
|
|
|
|
var warnExitNodeUsage = health.NewWarnable(health.WithConnectivityImpact())
|
|
|
|
// updateExitNodeUsageWarning updates a warnable meant to notify users of
|
|
// configuration issues that could break exit node usage.
|
|
func updateExitNodeUsageWarning(p ipn.PrefsView, state *netmon.State, health *health.Tracker) {
|
|
var result error
|
|
if p.ExitNodeIP().IsValid() || p.ExitNodeID() != "" {
|
|
warn, _ := netutil.CheckReversePathFiltering(state)
|
|
const comment = "please set rp_filter=2 instead of rp_filter=1; see https://github.com/tailscale/tailscale/issues/3310"
|
|
if len(warn) > 0 {
|
|
result = fmt.Errorf("%s: %v, %s", healthmsg.WarnExitNodeUsage, warn, comment)
|
|
}
|
|
}
|
|
health.SetWarnable(warnExitNodeUsage, result)
|
|
}
|
|
|
|
func (b *LocalBackend) checkExitNodePrefsLocked(p *ipn.Prefs) error {
|
|
if (p.ExitNodeIP.IsValid() || p.ExitNodeID != "") && p.AdvertisesExitNode() {
|
|
return errors.New("Cannot advertise an exit node and use an exit node at the same time.")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) checkFunnelEnabledLocked(p *ipn.Prefs) error {
|
|
if p.ShieldsUp && b.serveConfig.IsFunnelOn() {
|
|
return errors.New("Cannot enable shields-up when Funnel is enabled.")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) checkAutoUpdatePrefsLocked(p *ipn.Prefs) error {
|
|
if p.AutoUpdate.Apply.EqualBool(true) && !clientupdate.CanAutoUpdate() {
|
|
return errors.New("Auto-updates are not supported on this platform.")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SetUseExitNodeEnabled turns on or off the most recently selected exit node.
|
|
//
|
|
// On success, it returns the resulting prefs (or current prefs, in the case of no change).
|
|
// Setting the value to false when use of an exit node is already false is not an error,
|
|
// nor is true when the exit node is already in use.
|
|
func (b *LocalBackend) SetUseExitNodeEnabled(v bool) (ipn.PrefsView, error) {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
p0 := b.pm.CurrentPrefs()
|
|
if v && p0.ExitNodeID() != "" {
|
|
// Already on.
|
|
return p0, nil
|
|
}
|
|
if !v && p0.ExitNodeID() == "" {
|
|
// Already off.
|
|
return p0, nil
|
|
}
|
|
|
|
var zero ipn.PrefsView
|
|
if v && p0.InternalExitNodePrior() == "" {
|
|
if !p0.ExitNodeIP().IsValid() {
|
|
return zero, errors.New("no exit node IP to enable & prior exit node IP was never resolved an a node")
|
|
}
|
|
return zero, errors.New("no prior exit node to enable")
|
|
}
|
|
|
|
mp := &ipn.MaskedPrefs{}
|
|
if v {
|
|
mp.ExitNodeIDSet = true
|
|
mp.ExitNodeID = tailcfg.StableNodeID(p0.InternalExitNodePrior())
|
|
} else {
|
|
mp.ExitNodeIDSet = true
|
|
mp.ExitNodeID = ""
|
|
mp.InternalExitNodePriorSet = true
|
|
mp.InternalExitNodePrior = p0.ExitNodeID()
|
|
}
|
|
return b.editPrefsLockedOnEntry(mp, unlock)
|
|
}
|
|
|
|
// MaybeClearAppConnector clears the routes from any AppConnector if
|
|
// AdvertiseRoutes has been set in the MaskedPrefs.
|
|
func (b *LocalBackend) MaybeClearAppConnector(mp *ipn.MaskedPrefs) error {
|
|
var err error
|
|
if b.appConnector != nil && mp.AdvertiseRoutesSet {
|
|
err = b.appConnector.ClearRoutes()
|
|
if err != nil {
|
|
b.logf("appc: clear routes error: %v", err)
|
|
}
|
|
}
|
|
return err
|
|
}
|
|
|
|
func (b *LocalBackend) EditPrefs(mp *ipn.MaskedPrefs) (ipn.PrefsView, error) {
|
|
if mp.SetsInternal() {
|
|
return ipn.PrefsView{}, errors.New("can't set Internal fields")
|
|
}
|
|
|
|
// Zeroing the ExitNodeId via localAPI must also zero the prior exit node.
|
|
if mp.ExitNodeIDSet && mp.ExitNodeID == "" {
|
|
mp.InternalExitNodePrior = ""
|
|
mp.InternalExitNodePriorSet = true
|
|
}
|
|
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
return b.editPrefsLockedOnEntry(mp, unlock)
|
|
}
|
|
|
|
// Warning: b.mu must be held on entry, but it unlocks it on the way out.
|
|
// TODO(bradfitz): redo the locking on all these weird methods like this.
|
|
func (b *LocalBackend) editPrefsLockedOnEntry(mp *ipn.MaskedPrefs, unlock unlockOnce) (ipn.PrefsView, error) {
|
|
defer unlock() // for error paths
|
|
|
|
if mp.EggSet {
|
|
mp.EggSet = false
|
|
b.egg = true
|
|
go b.doSetHostinfoFilterServices()
|
|
}
|
|
p0 := b.pm.CurrentPrefs()
|
|
p1 := b.pm.CurrentPrefs().AsStruct()
|
|
p1.ApplyEdits(mp)
|
|
if err := b.checkPrefsLocked(p1); err != nil {
|
|
b.logf("EditPrefs check error: %v", err)
|
|
return ipn.PrefsView{}, err
|
|
}
|
|
if p1.RunSSH && !envknob.CanSSHD() {
|
|
b.logf("EditPrefs requests SSH, but disabled by envknob; returning error")
|
|
return ipn.PrefsView{}, errors.New("Tailscale SSH server administratively disabled.")
|
|
}
|
|
if p1.View().Equals(p0) {
|
|
return stripKeysFromPrefs(p0), nil
|
|
}
|
|
b.logf("EditPrefs: %v", mp.Pretty())
|
|
newPrefs := b.setPrefsLockedOnEntry(p1, unlock)
|
|
|
|
// Note: don't perform any actions for the new prefs here. Not
|
|
// every prefs change goes through EditPrefs. Put your actions
|
|
// in setPrefsLocksOnEntry instead.
|
|
|
|
// This should return the public prefs, not the private ones.
|
|
return stripKeysFromPrefs(newPrefs), nil
|
|
}
|
|
|
|
func (b *LocalBackend) checkProfileNameLocked(p *ipn.Prefs) error {
|
|
if p.ProfileName == "" {
|
|
// It is always okay to clear the profile name.
|
|
return nil
|
|
}
|
|
id := b.pm.ProfileIDForName(p.ProfileName)
|
|
if id == "" {
|
|
// No profile with that name exists. That's fine.
|
|
return nil
|
|
}
|
|
if id != b.pm.CurrentProfile().ID {
|
|
// Name is already in use by another profile.
|
|
return fmt.Errorf("profile name %q already in use", p.ProfileName)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// wantIngressLocked reports whether this node has ingress configured. This bool
|
|
// is sent to the coordination server (in Hostinfo.WireIngress) as an
|
|
// optimization hint to know primarily which nodes are NOT using ingress, to
|
|
// avoid doing work for regular nodes.
|
|
//
|
|
// Even if the user's ServeConfig.AllowFunnel map was manually edited in raw
|
|
// mode and contains map entries with false values, sending true (from Len > 0)
|
|
// is still fine. This is only an optimization hint for the control plane and
|
|
// doesn't affect security or correctness. And we also don't expect people to
|
|
// modify their ServeConfig in raw mode.
|
|
func (b *LocalBackend) wantIngressLocked() bool {
|
|
return b.serveConfig.Valid() && b.serveConfig.HasAllowFunnel()
|
|
}
|
|
|
|
// setPrefsLockedOnEntry requires b.mu be held to call it, but it
|
|
// unlocks b.mu when done. newp ownership passes to this function.
|
|
// It returns a readonly copy of the new prefs.
|
|
func (b *LocalBackend) setPrefsLockedOnEntry(newp *ipn.Prefs, unlock unlockOnce) ipn.PrefsView {
|
|
defer unlock()
|
|
|
|
netMap := b.netMap
|
|
b.setAtomicValuesFromPrefsLocked(newp.View())
|
|
|
|
oldp := b.pm.CurrentPrefs()
|
|
if oldp.Valid() {
|
|
newp.Persist = oldp.Persist().AsStruct() // caller isn't allowed to override this
|
|
}
|
|
// setExitNodeID returns whether it updated b.prefs, but
|
|
// everything in this function treats b.prefs as completely new
|
|
// anyway. No-op if no exit node resolution is needed.
|
|
setExitNodeID(newp, netMap)
|
|
// applySysPolicy does likewise so we can also ignore its return value.
|
|
applySysPolicy(newp)
|
|
// We do this to avoid holding the lock while doing everything else.
|
|
|
|
oldHi := b.hostinfo
|
|
newHi := oldHi.Clone()
|
|
if newHi == nil {
|
|
newHi = new(tailcfg.Hostinfo)
|
|
}
|
|
b.applyPrefsToHostinfoLocked(newHi, newp.View())
|
|
b.hostinfo = newHi
|
|
hostInfoChanged := !oldHi.Equal(newHi)
|
|
cc := b.cc
|
|
|
|
b.updateFilterLocked(netMap, newp.View())
|
|
|
|
if oldp.ShouldSSHBeRunning() && !newp.ShouldSSHBeRunning() {
|
|
if b.sshServer != nil {
|
|
go b.sshServer.Shutdown()
|
|
b.sshServer = nil
|
|
}
|
|
}
|
|
if netMap != nil {
|
|
newProfile := netMap.UserProfiles[netMap.User()]
|
|
if newLoginName := newProfile.LoginName; newLoginName != "" {
|
|
if !oldp.Persist().Valid() {
|
|
b.logf("active login: %s", newLoginName)
|
|
} else {
|
|
oldLoginName := oldp.Persist().UserProfile().LoginName
|
|
if oldLoginName != newLoginName {
|
|
b.logf("active login: %q (changed from %q)", newLoginName, oldLoginName)
|
|
}
|
|
newp.Persist.UserProfile = newProfile
|
|
}
|
|
}
|
|
}
|
|
|
|
prefs := newp.View()
|
|
if err := b.pm.SetPrefs(prefs, ipn.NetworkProfile{
|
|
MagicDNSName: b.netMap.MagicDNSSuffix(),
|
|
DomainName: b.netMap.DomainName(),
|
|
}); err != nil {
|
|
b.logf("failed to save new controlclient state: %v", err)
|
|
}
|
|
|
|
unlock.UnlockEarly()
|
|
|
|
if oldp.ShieldsUp() != newp.ShieldsUp || hostInfoChanged {
|
|
b.doSetHostinfoFilterServices()
|
|
}
|
|
|
|
if netMap != nil {
|
|
b.MagicConn().SetDERPMap(netMap.DERPMap)
|
|
}
|
|
|
|
if !oldp.WantRunning() && newp.WantRunning {
|
|
b.logf("transitioning to running; doing Login...")
|
|
cc.Login(nil, controlclient.LoginDefault)
|
|
}
|
|
|
|
if oldp.WantRunning() != newp.WantRunning {
|
|
b.stateMachine()
|
|
} else {
|
|
b.authReconfig()
|
|
}
|
|
|
|
b.send(ipn.Notify{Prefs: &prefs})
|
|
return prefs
|
|
}
|
|
|
|
// GetPeerAPIPort returns the port number for the peerapi server
|
|
// running on the provided IP.
|
|
func (b *LocalBackend) GetPeerAPIPort(ip netip.Addr) (port uint16, ok bool) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
for _, pln := range b.peerAPIListeners {
|
|
if pln.ip == ip {
|
|
return uint16(pln.port), true
|
|
}
|
|
}
|
|
return 0, false
|
|
}
|
|
|
|
// handlePeerAPIConn serves an already-accepted connection c.
|
|
//
|
|
// The remote parameter is the remote address.
|
|
// The local parameter is the local address (either a Tailscale IPv4
|
|
// or IPv6 IP and the peerapi port for that address).
|
|
//
|
|
// The connection will be closed by handlePeerAPIConn.
|
|
func (b *LocalBackend) handlePeerAPIConn(remote, local netip.AddrPort, c net.Conn) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
for _, pln := range b.peerAPIListeners {
|
|
if pln.ip == local.Addr() {
|
|
go pln.ServeConn(remote, c)
|
|
return
|
|
}
|
|
}
|
|
b.logf("[unexpected] no peerAPI listener found for %v", local)
|
|
c.Close()
|
|
return
|
|
}
|
|
|
|
func (b *LocalBackend) isLocalIP(ip netip.Addr) bool {
|
|
nm := b.NetMap()
|
|
return nm != nil && views.SliceContains(nm.GetAddresses(), netip.PrefixFrom(ip, ip.BitLen()))
|
|
}
|
|
|
|
var (
|
|
magicDNSIP = tsaddr.TailscaleServiceIP()
|
|
magicDNSIPv6 = tsaddr.TailscaleServiceIPv6()
|
|
)
|
|
|
|
// TCPHandlerForDst returns a TCP handler for connections to dst, or nil if
|
|
// no handler is needed. It also returns a list of TCP socket options to
|
|
// apply to the socket before calling the handler.
|
|
// TCPHandlerForDst is called both for connections to our node's local IP
|
|
// as well as to the service IP (quad 100).
|
|
func (b *LocalBackend) TCPHandlerForDst(src, dst netip.AddrPort) (handler func(c net.Conn) error, opts []tcpip.SettableSocketOption) {
|
|
// First handle internal connections to the service IP
|
|
hittingServiceIP := dst.Addr() == magicDNSIP || dst.Addr() == magicDNSIPv6
|
|
if hittingServiceIP {
|
|
switch dst.Port() {
|
|
case 80:
|
|
// TODO(mpminardi): do we want to show an error message if the web client
|
|
// has been disabled instead of the more "basic" web UI?
|
|
if b.ShouldRunWebClient() {
|
|
return b.handleWebClientConn, opts
|
|
}
|
|
return b.HandleQuad100Port80Conn, opts
|
|
case DriveLocalPort:
|
|
return b.handleDriveConn, opts
|
|
}
|
|
}
|
|
|
|
// Then handle external connections to the local IP.
|
|
if !b.isLocalIP(dst.Addr()) {
|
|
return nil, nil
|
|
}
|
|
if dst.Port() == 22 && b.ShouldRunSSH() {
|
|
// Use a higher keepalive idle time for SSH connections, as they are
|
|
// typically long lived and idle connections are more likely to be
|
|
// intentional. Ideally we would turn this off entirely, but we can't
|
|
// tell the difference between a long lived connection that is idle
|
|
// vs a connection that is dead because the peer has gone away.
|
|
// We pick 72h as that is typically sufficient for a long weekend.
|
|
opts = append(opts, ptr.To(tcpip.KeepaliveIdleOption(72*time.Hour)))
|
|
return b.handleSSHConn, opts
|
|
}
|
|
// TODO(will,sonia): allow customizing web client port ?
|
|
if dst.Port() == webClientPort && b.ShouldExposeRemoteWebClient() {
|
|
return b.handleWebClientConn, opts
|
|
}
|
|
if port, ok := b.GetPeerAPIPort(dst.Addr()); ok && dst.Port() == port {
|
|
return func(c net.Conn) error {
|
|
b.handlePeerAPIConn(src, dst, c)
|
|
return nil
|
|
}, opts
|
|
}
|
|
if handler := b.tcpHandlerForServe(dst.Port(), src); handler != nil {
|
|
return handler, opts
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
func (b *LocalBackend) handleDriveConn(conn net.Conn) error {
|
|
fs, ok := b.sys.DriveForLocal.GetOK()
|
|
if !ok || !b.DriveAccessEnabled() {
|
|
conn.Close()
|
|
return nil
|
|
}
|
|
return fs.HandleConn(conn, conn.RemoteAddr())
|
|
}
|
|
|
|
func (b *LocalBackend) peerAPIServicesLocked() (ret []tailcfg.Service) {
|
|
for _, pln := range b.peerAPIListeners {
|
|
proto := tailcfg.PeerAPI4
|
|
if pln.ip.Is6() {
|
|
proto = tailcfg.PeerAPI6
|
|
}
|
|
ret = append(ret, tailcfg.Service{
|
|
Proto: proto,
|
|
Port: uint16(pln.port),
|
|
})
|
|
}
|
|
switch runtime.GOOS {
|
|
case "linux", "freebsd", "openbsd", "illumos", "darwin", "windows", "android", "ios":
|
|
// These are the platforms currently supported by
|
|
// net/dns/resolver/tsdns.go:Resolver.HandleExitNodeDNSQuery.
|
|
ret = append(ret, tailcfg.Service{
|
|
Proto: tailcfg.PeerAPIDNS,
|
|
Port: 1, // version
|
|
})
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// doSetHostinfoFilterServices calls SetHostinfo on the controlclient,
|
|
// possibly after mangling the given hostinfo.
|
|
//
|
|
// TODO(danderson): we shouldn't be mangling hostinfo here after
|
|
// painstakingly constructing it in twelvety other places.
|
|
func (b *LocalBackend) doSetHostinfoFilterServices() {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
cc := b.cc
|
|
if cc == nil {
|
|
// Control client isn't up yet.
|
|
return
|
|
}
|
|
if b.hostinfo == nil {
|
|
b.logf("[unexpected] doSetHostinfoFilterServices with nil hostinfo")
|
|
return
|
|
}
|
|
peerAPIServices := b.peerAPIServicesLocked()
|
|
if b.egg {
|
|
peerAPIServices = append(peerAPIServices, tailcfg.Service{Proto: "egg", Port: 1})
|
|
}
|
|
|
|
// TODO(maisem,bradfitz): store hostinfo as a view, not as a mutable struct.
|
|
hi := *b.hostinfo // shallow copy
|
|
unlock.UnlockEarly()
|
|
|
|
// Make a shallow copy of hostinfo so we can mutate
|
|
// at the Service field.
|
|
if !b.shouldUploadServices() {
|
|
hi.Services = []tailcfg.Service{}
|
|
}
|
|
// Don't mutate hi.Service's underlying array. Append to
|
|
// the slice with no free capacity.
|
|
c := len(hi.Services)
|
|
hi.Services = append(hi.Services[:c:c], peerAPIServices...)
|
|
hi.PushDeviceToken = b.pushDeviceToken.Load()
|
|
cc.SetHostinfo(&hi)
|
|
}
|
|
|
|
// NetMap returns the latest cached network map received from
|
|
// controlclient, or nil if no network map was received yet.
|
|
func (b *LocalBackend) NetMap() *netmap.NetworkMap {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.netMap
|
|
}
|
|
|
|
func (b *LocalBackend) isEngineBlocked() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.blocked
|
|
}
|
|
|
|
// blockEngineUpdate sets b.blocked to block, while holding b.mu. Its
|
|
// indirect effect is to turn b.authReconfig() into a no-op if block
|
|
// is true.
|
|
func (b *LocalBackend) blockEngineUpdates(block bool) {
|
|
b.logf("blockEngineUpdates(%v)", block)
|
|
|
|
b.mu.Lock()
|
|
b.blocked = block
|
|
b.mu.Unlock()
|
|
}
|
|
|
|
// reconfigAppConnectorLocked updates the app connector state based on the
|
|
// current network map and preferences.
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) reconfigAppConnectorLocked(nm *netmap.NetworkMap, prefs ipn.PrefsView) {
|
|
const appConnectorCapName = "tailscale.com/app-connectors"
|
|
defer func() {
|
|
if b.hostinfo != nil {
|
|
b.hostinfo.AppConnector.Set(b.appConnector != nil)
|
|
}
|
|
}()
|
|
|
|
if !prefs.AppConnector().Advertise {
|
|
b.appConnector = nil
|
|
return
|
|
}
|
|
|
|
shouldAppCStoreRoutes := b.ControlKnobs().AppCStoreRoutes.Load()
|
|
if b.appConnector == nil || b.appConnector.ShouldStoreRoutes() != shouldAppCStoreRoutes {
|
|
var ri *appc.RouteInfo
|
|
var storeFunc func(*appc.RouteInfo) error
|
|
if shouldAppCStoreRoutes {
|
|
var err error
|
|
ri, err = b.readRouteInfoLocked()
|
|
if err != nil {
|
|
ri = &appc.RouteInfo{}
|
|
if err != ipn.ErrStateNotExist {
|
|
b.logf("Unsuccessful Read RouteInfo: ", err)
|
|
}
|
|
}
|
|
storeFunc = b.storeRouteInfo
|
|
}
|
|
b.appConnector = appc.NewAppConnector(b.logf, b, ri, storeFunc)
|
|
}
|
|
if nm == nil {
|
|
return
|
|
}
|
|
|
|
// TODO(raggi): rework the view infrastructure so the large deep clone is no
|
|
// longer required
|
|
sn := nm.SelfNode.AsStruct()
|
|
attrs, err := tailcfg.UnmarshalNodeCapJSON[appctype.AppConnectorAttr](sn.CapMap, appConnectorCapName)
|
|
if err != nil {
|
|
b.logf("[unexpected] error parsing app connector mapcap: %v", err)
|
|
return
|
|
}
|
|
|
|
// Geometric cost, assumes that the number of advertised tags is small
|
|
selfHasTag := func(attrTags []string) bool {
|
|
return nm.SelfNode.Tags().ContainsFunc(func(tag string) bool {
|
|
return slices.Contains(attrTags, tag)
|
|
})
|
|
}
|
|
|
|
var (
|
|
domains []string
|
|
routes []netip.Prefix
|
|
)
|
|
for _, attr := range attrs {
|
|
if slices.Contains(attr.Connectors, "*") || selfHasTag(attr.Connectors) {
|
|
domains = append(domains, attr.Domains...)
|
|
routes = append(routes, attr.Routes...)
|
|
}
|
|
}
|
|
slices.Sort(domains)
|
|
slices.SortFunc(routes, func(i, j netip.Prefix) int { return i.Addr().Compare(j.Addr()) })
|
|
domains = slices.Compact(domains)
|
|
routes = slices.Compact(routes)
|
|
b.appConnector.UpdateDomainsAndRoutes(domains, routes)
|
|
}
|
|
|
|
// authReconfig pushes a new configuration into wgengine, if engine
|
|
// updates are not currently blocked, based on the cached netmap and
|
|
// user prefs.
|
|
func (b *LocalBackend) authReconfig() {
|
|
b.mu.Lock()
|
|
blocked := b.blocked
|
|
prefs := b.pm.CurrentPrefs()
|
|
nm := b.netMap
|
|
hasPAC := b.prevIfState.HasPAC()
|
|
disableSubnetsIfPAC := nm.HasCap(tailcfg.NodeAttrDisableSubnetsIfPAC)
|
|
userDialUseRoutes := nm.HasCap(tailcfg.NodeAttrUserDialUseRoutes)
|
|
dohURL, dohURLOK := exitNodeCanProxyDNS(nm, b.peers, prefs.ExitNodeID())
|
|
dcfg := dnsConfigForNetmap(nm, b.peers, prefs, b.logf, version.OS())
|
|
// If the current node is an app connector, ensure the app connector machine is started
|
|
b.reconfigAppConnectorLocked(nm, prefs)
|
|
b.mu.Unlock()
|
|
|
|
if blocked {
|
|
b.logf("[v1] authReconfig: blocked, skipping.")
|
|
return
|
|
}
|
|
if nm == nil {
|
|
b.logf("[v1] authReconfig: netmap not yet valid. Skipping.")
|
|
return
|
|
}
|
|
if !prefs.WantRunning() {
|
|
b.logf("[v1] authReconfig: skipping because !WantRunning.")
|
|
return
|
|
}
|
|
|
|
var flags netmap.WGConfigFlags
|
|
if prefs.RouteAll() {
|
|
flags |= netmap.AllowSubnetRoutes
|
|
}
|
|
if prefs.AllowSingleHosts() {
|
|
flags |= netmap.AllowSingleHosts
|
|
}
|
|
if hasPAC && disableSubnetsIfPAC {
|
|
if flags&netmap.AllowSubnetRoutes != 0 {
|
|
b.logf("authReconfig: have PAC; disabling subnet routes")
|
|
flags &^= netmap.AllowSubnetRoutes
|
|
}
|
|
}
|
|
|
|
// Keep the dialer updated about whether we're supposed to use
|
|
// an exit node's DNS server (so SOCKS5/HTTP outgoing dials
|
|
// can use it for name resolution)
|
|
if dohURLOK {
|
|
b.dialer.SetExitDNSDoH(dohURL)
|
|
} else {
|
|
b.dialer.SetExitDNSDoH("")
|
|
}
|
|
|
|
cfg, err := nmcfg.WGCfg(nm, b.logf, flags, prefs.ExitNodeID())
|
|
if err != nil {
|
|
b.logf("wgcfg: %v", err)
|
|
return
|
|
}
|
|
|
|
oneCGNATRoute := shouldUseOneCGNATRoute(b.logf, b.sys.ControlKnobs(), version.OS())
|
|
rcfg := b.routerConfig(cfg, prefs, oneCGNATRoute)
|
|
|
|
err = b.e.Reconfig(cfg, rcfg, dcfg)
|
|
if err == wgengine.ErrNoChanges {
|
|
return
|
|
}
|
|
b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", prefs.RouteAll(), prefs.CorpDNS(), flags, err)
|
|
|
|
if userDialUseRoutes {
|
|
b.dialer.SetRoutes(rcfg.Routes, rcfg.LocalRoutes)
|
|
} else {
|
|
b.dialer.SetRoutes(nil, nil)
|
|
}
|
|
|
|
b.initPeerAPIListener()
|
|
}
|
|
|
|
// shouldUseOneCGNATRoute reports whether we should prefer to make one big
|
|
// CGNAT /10 route rather than a /32 per peer.
|
|
//
|
|
// The versionOS is a Tailscale-style version ("iOS", "macOS") and not
|
|
// a runtime.GOOS.
|
|
func shouldUseOneCGNATRoute(logf logger.Logf, controlKnobs *controlknobs.Knobs, versionOS string) bool {
|
|
if controlKnobs != nil {
|
|
// Explicit enabling or disabling always take precedence.
|
|
if v, ok := controlKnobs.OneCGNAT.Load().Get(); ok {
|
|
logf("[v1] shouldUseOneCGNATRoute: explicit=%v", v)
|
|
return v
|
|
}
|
|
}
|
|
|
|
// Also prefer to do this on the Mac, so that we don't need to constantly
|
|
// update the network extension configuration (which is disruptive to
|
|
// Chrome, see https://github.com/tailscale/tailscale/issues/3102). Only
|
|
// use fine-grained routes if another interfaces is also using the CGNAT
|
|
// IP range.
|
|
if versionOS == "macOS" {
|
|
hasCGNATInterface, err := netmon.HasCGNATInterface()
|
|
if err != nil {
|
|
logf("shouldUseOneCGNATRoute: Could not determine if any interfaces use CGNAT: %v", err)
|
|
return false
|
|
}
|
|
logf("[v1] shouldUseOneCGNATRoute: macOS automatic=%v", !hasCGNATInterface)
|
|
if !hasCGNATInterface {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// dnsConfigForNetmap returns a *dns.Config for the given netmap,
|
|
// prefs, client OS version, and cloud hosting environment.
|
|
//
|
|
// The versionOS is a Tailscale-style version ("iOS", "macOS") and not
|
|
// a runtime.GOOS.
|
|
func dnsConfigForNetmap(nm *netmap.NetworkMap, peers map[tailcfg.NodeID]tailcfg.NodeView, prefs ipn.PrefsView, logf logger.Logf, versionOS string) *dns.Config {
|
|
if nm == nil {
|
|
return nil
|
|
}
|
|
dcfg := &dns.Config{
|
|
Routes: map[dnsname.FQDN][]*dnstype.Resolver{},
|
|
Hosts: map[dnsname.FQDN][]netip.Addr{},
|
|
}
|
|
|
|
// selfV6Only is whether we only have IPv6 addresses ourselves.
|
|
selfV6Only := nm.GetAddresses().ContainsFunc(tsaddr.PrefixIs6) &&
|
|
!nm.GetAddresses().ContainsFunc(tsaddr.PrefixIs4)
|
|
dcfg.OnlyIPv6 = selfV6Only
|
|
|
|
// Populate MagicDNS records. We do this unconditionally so that
|
|
// quad-100 can always respond to MagicDNS queries, even if the OS
|
|
// isn't configured to make MagicDNS resolution truly
|
|
// magic. Details in
|
|
// https://github.com/tailscale/tailscale/issues/1886.
|
|
set := func(name string, addrs views.Slice[netip.Prefix]) {
|
|
if addrs.Len() == 0 || name == "" {
|
|
return
|
|
}
|
|
fqdn, err := dnsname.ToFQDN(name)
|
|
if err != nil {
|
|
return // TODO: propagate error?
|
|
}
|
|
var have4 bool
|
|
for i := range addrs.Len() {
|
|
if addrs.At(i).Addr().Is4() {
|
|
have4 = true
|
|
break
|
|
}
|
|
}
|
|
var ips []netip.Addr
|
|
for i := range addrs.Len() {
|
|
addr := addrs.At(i)
|
|
if selfV6Only {
|
|
if addr.Addr().Is6() {
|
|
ips = append(ips, addr.Addr())
|
|
}
|
|
continue
|
|
}
|
|
// If this node has an IPv4 address, then
|
|
// remove peers' IPv6 addresses for now, as we
|
|
// don't guarantee that the peer node actually
|
|
// can speak IPv6 correctly.
|
|
//
|
|
// https://github.com/tailscale/tailscale/issues/1152
|
|
// tracks adding the right capability reporting to
|
|
// enable AAAA in MagicDNS.
|
|
if addr.Addr().Is6() && have4 {
|
|
continue
|
|
}
|
|
ips = append(ips, addr.Addr())
|
|
}
|
|
dcfg.Hosts[fqdn] = ips
|
|
}
|
|
set(nm.Name, nm.GetAddresses())
|
|
for _, peer := range peers {
|
|
set(peer.Name(), peer.Addresses())
|
|
}
|
|
for _, rec := range nm.DNS.ExtraRecords {
|
|
switch rec.Type {
|
|
case "", "A", "AAAA":
|
|
// Treat these all the same for now: infer from the value
|
|
default:
|
|
// TODO: more
|
|
continue
|
|
}
|
|
ip, err := netip.ParseAddr(rec.Value)
|
|
if err != nil {
|
|
// Ignore.
|
|
continue
|
|
}
|
|
fqdn, err := dnsname.ToFQDN(rec.Name)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
dcfg.Hosts[fqdn] = append(dcfg.Hosts[fqdn], ip)
|
|
}
|
|
|
|
if !prefs.CorpDNS() {
|
|
return dcfg
|
|
}
|
|
|
|
for _, dom := range nm.DNS.Domains {
|
|
fqdn, err := dnsname.ToFQDN(dom)
|
|
if err != nil {
|
|
logf("[unexpected] non-FQDN search domain %q", dom)
|
|
}
|
|
dcfg.SearchDomains = append(dcfg.SearchDomains, fqdn)
|
|
}
|
|
if nm.DNS.Proxied { // actually means "enable MagicDNS"
|
|
for _, dom := range magicDNSRootDomains(nm) {
|
|
dcfg.Routes[dom] = nil // resolve internally with dcfg.Hosts
|
|
}
|
|
}
|
|
|
|
addDefault := func(resolvers []*dnstype.Resolver) {
|
|
dcfg.DefaultResolvers = append(dcfg.DefaultResolvers, resolvers...)
|
|
}
|
|
|
|
// If we're using an exit node and that exit node is new enough (1.19.x+)
|
|
// to run a DoH DNS proxy, then send all our DNS traffic through it.
|
|
if dohURL, ok := exitNodeCanProxyDNS(nm, peers, prefs.ExitNodeID()); ok {
|
|
addDefault([]*dnstype.Resolver{{Addr: dohURL}})
|
|
return dcfg
|
|
}
|
|
|
|
// If the user has set default resolvers ("override local DNS"), prefer to
|
|
// use those resolvers as the default, otherwise if there are WireGuard exit
|
|
// node resolvers, use those as the default.
|
|
if len(nm.DNS.Resolvers) > 0 {
|
|
addDefault(nm.DNS.Resolvers)
|
|
} else {
|
|
if resolvers, ok := wireguardExitNodeDNSResolvers(nm, peers, prefs.ExitNodeID()); ok {
|
|
addDefault(resolvers)
|
|
}
|
|
}
|
|
|
|
for suffix, resolvers := range nm.DNS.Routes {
|
|
fqdn, err := dnsname.ToFQDN(suffix)
|
|
if err != nil {
|
|
logf("[unexpected] non-FQDN route suffix %q", suffix)
|
|
}
|
|
|
|
// Create map entry even if len(resolvers) == 0; Issue 2706.
|
|
// This lets the control plane send ExtraRecords for which we
|
|
// can authoritatively answer "name not exists" for when the
|
|
// control plane also sends this explicit but empty route
|
|
// making it as something we handle.
|
|
//
|
|
// While we're already populating it, might as well size the
|
|
// slice appropriately.
|
|
// Per #9498 the exact requirements of nil vs empty slice remain
|
|
// unclear, this is a haunted graveyard to be resolved.
|
|
dcfg.Routes[fqdn] = make([]*dnstype.Resolver, 0, len(resolvers))
|
|
dcfg.Routes[fqdn] = append(dcfg.Routes[fqdn], resolvers...)
|
|
}
|
|
|
|
// Set FallbackResolvers as the default resolvers in the
|
|
// scenarios that can't handle a purely split-DNS config. See
|
|
// https://github.com/tailscale/tailscale/issues/1743 for
|
|
// details.
|
|
switch {
|
|
case len(dcfg.DefaultResolvers) != 0:
|
|
// Default resolvers already set.
|
|
case !prefs.ExitNodeID().IsZero():
|
|
// When using an exit node, we send all DNS traffic to the exit node, so
|
|
// we don't need a fallback resolver.
|
|
//
|
|
// However, if the exit node is too old to run a DoH DNS proxy, then we
|
|
// need to use a fallback resolver as it's very likely the LAN resolvers
|
|
// will become unreachable.
|
|
//
|
|
// This is especially important on Apple OSes, where
|
|
// adding the default route to the tunnel interface makes
|
|
// it "primary", and we MUST provide VPN-sourced DNS
|
|
// settings or we break all DNS resolution.
|
|
//
|
|
// https://github.com/tailscale/tailscale/issues/1713
|
|
addDefault(nm.DNS.FallbackResolvers)
|
|
case len(dcfg.Routes) == 0:
|
|
// No settings requiring split DNS, no problem.
|
|
}
|
|
|
|
return dcfg
|
|
}
|
|
|
|
// SetTCPHandlerForFunnelFlow sets the TCP handler for Funnel flows.
|
|
// It should only be called before the LocalBackend is used.
|
|
func (b *LocalBackend) SetTCPHandlerForFunnelFlow(h func(src netip.AddrPort, dstPort uint16) (handler func(net.Conn))) {
|
|
b.getTCPHandlerForFunnelFlow = h
|
|
}
|
|
|
|
// SetVarRoot sets the root directory of Tailscale's writable
|
|
// storage area . (e.g. "/var/lib/tailscale")
|
|
//
|
|
// It should only be called before the LocalBackend is used.
|
|
func (b *LocalBackend) SetVarRoot(dir string) {
|
|
b.varRoot = dir
|
|
}
|
|
|
|
// SetLogFlusher sets a func to be called to flush log uploads.
|
|
//
|
|
// It should only be called before the LocalBackend is used.
|
|
func (b *LocalBackend) SetLogFlusher(flushFunc func()) {
|
|
b.logFlushFunc = flushFunc
|
|
}
|
|
|
|
// TryFlushLogs calls the log flush function. It returns false if a log flush
|
|
// function was never initialized with SetLogFlusher.
|
|
//
|
|
// TryFlushLogs should not block.
|
|
func (b *LocalBackend) TryFlushLogs() bool {
|
|
if b.logFlushFunc == nil {
|
|
return false
|
|
}
|
|
b.logFlushFunc()
|
|
return true
|
|
}
|
|
|
|
// TailscaleVarRoot returns the root directory of Tailscale's writable
|
|
// storage area. (e.g. "/var/lib/tailscale")
|
|
//
|
|
// It returns an empty string if there's no configured or discovered
|
|
// location.
|
|
func (b *LocalBackend) TailscaleVarRoot() string {
|
|
if b.varRoot != "" {
|
|
return b.varRoot
|
|
}
|
|
switch runtime.GOOS {
|
|
case "ios", "android", "darwin":
|
|
return paths.AppSharedDir.Load()
|
|
case "linux":
|
|
if distro.Get() == distro.Gokrazy {
|
|
return "/perm/tailscaled"
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func (b *LocalBackend) fileRootLocked(uid tailcfg.UserID) string {
|
|
if v := b.directFileRoot; v != "" {
|
|
return v
|
|
}
|
|
varRoot := b.TailscaleVarRoot()
|
|
if varRoot == "" {
|
|
b.logf("Taildrop disabled; no state directory")
|
|
return ""
|
|
}
|
|
baseDir := fmt.Sprintf("%s-uid-%d",
|
|
strings.ReplaceAll(b.activeLogin, "@", "-"),
|
|
uid)
|
|
dir := filepath.Join(varRoot, "files", baseDir)
|
|
if err := os.MkdirAll(dir, 0700); err != nil {
|
|
b.logf("Taildrop disabled; error making directory: %v", err)
|
|
return ""
|
|
}
|
|
return dir
|
|
}
|
|
|
|
// closePeerAPIListenersLocked closes any existing PeerAPI listeners
|
|
// and clears out the PeerAPI server state.
|
|
//
|
|
// It does not kick off any Hostinfo update with new services.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) closePeerAPIListenersLocked() {
|
|
b.peerAPIServer = nil
|
|
for _, pln := range b.peerAPIListeners {
|
|
pln.Close()
|
|
}
|
|
b.peerAPIListeners = nil
|
|
}
|
|
|
|
// peerAPIListenAsync is whether the operating system requires that we
|
|
// retry listening on the peerAPI ip/port for whatever reason.
|
|
//
|
|
// On Windows, see Issue 1620.
|
|
// On Android, see Issue 1960.
|
|
const peerAPIListenAsync = runtime.GOOS == "windows" || runtime.GOOS == "android"
|
|
|
|
func (b *LocalBackend) initPeerAPIListener() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.shutdownCalled {
|
|
return
|
|
}
|
|
|
|
if b.netMap == nil {
|
|
// We're called from authReconfig which checks that
|
|
// netMap is non-nil, but if a concurrent Logout,
|
|
// ResetForClientDisconnect, or Start happens when its
|
|
// mutex was released, the netMap could be
|
|
// nil'ed out (Issue 1996). Bail out early here if so.
|
|
return
|
|
}
|
|
|
|
addrs := b.netMap.GetAddresses()
|
|
if addrs.Len() == len(b.peerAPIListeners) {
|
|
allSame := true
|
|
for i, pln := range b.peerAPIListeners {
|
|
if pln.ip != addrs.At(i).Addr() {
|
|
allSame = false
|
|
break
|
|
}
|
|
}
|
|
if allSame {
|
|
// Nothing to do.
|
|
return
|
|
}
|
|
}
|
|
|
|
b.closePeerAPIListenersLocked()
|
|
|
|
selfNode := b.netMap.SelfNode
|
|
if !selfNode.Valid() || b.netMap.GetAddresses().Len() == 0 {
|
|
return
|
|
}
|
|
|
|
fileRoot := b.fileRootLocked(selfNode.User())
|
|
if fileRoot == "" {
|
|
b.logf("peerapi starting without Taildrop directory configured")
|
|
}
|
|
|
|
ps := &peerAPIServer{
|
|
b: b,
|
|
taildrop: taildrop.ManagerOptions{
|
|
Logf: b.logf,
|
|
Clock: tstime.DefaultClock{Clock: b.clock},
|
|
State: b.store,
|
|
Dir: fileRoot,
|
|
DirectFileMode: b.directFileRoot != "",
|
|
SendFileNotify: b.sendFileNotify,
|
|
}.New(),
|
|
}
|
|
if dm, ok := b.sys.DNSManager.GetOK(); ok {
|
|
ps.resolver = dm.Resolver()
|
|
}
|
|
b.peerAPIServer = ps
|
|
|
|
isNetstack := b.sys.IsNetstack()
|
|
for i := range addrs.Len() {
|
|
a := addrs.At(i)
|
|
var ln net.Listener
|
|
var err error
|
|
skipListen := i > 0 && isNetstack
|
|
if !skipListen {
|
|
ln, err = ps.listen(a.Addr(), b.prevIfState)
|
|
if err != nil {
|
|
if peerAPIListenAsync {
|
|
// Expected. But we fix it later in linkChange
|
|
// ("peerAPIListeners too low").
|
|
continue
|
|
}
|
|
b.logf("[unexpected] peerapi listen(%q) error: %v", a.Addr(), err)
|
|
continue
|
|
}
|
|
}
|
|
pln := &peerAPIListener{
|
|
ps: ps,
|
|
ip: a.Addr(),
|
|
ln: ln, // nil for 2nd+ on netstack
|
|
lb: b,
|
|
}
|
|
if skipListen {
|
|
pln.port = b.peerAPIListeners[0].port
|
|
} else {
|
|
pln.port = ln.Addr().(*net.TCPAddr).Port
|
|
}
|
|
pln.urlStr = "http://" + net.JoinHostPort(a.Addr().String(), strconv.Itoa(pln.port))
|
|
b.logf("peerapi: serving on %s", pln.urlStr)
|
|
go pln.serve()
|
|
b.peerAPIListeners = append(b.peerAPIListeners, pln)
|
|
}
|
|
|
|
go b.doSetHostinfoFilterServices()
|
|
}
|
|
|
|
// magicDNSRootDomains returns the subset of nm.DNS.Domains that are the search domains for MagicDNS.
|
|
func magicDNSRootDomains(nm *netmap.NetworkMap) []dnsname.FQDN {
|
|
if v := nm.MagicDNSSuffix(); v != "" {
|
|
fqdn, err := dnsname.ToFQDN(v)
|
|
if err != nil {
|
|
// TODO: propagate error
|
|
return nil
|
|
}
|
|
ret := []dnsname.FQDN{
|
|
fqdn,
|
|
dnsname.FQDN("0.e.1.a.c.5.1.1.a.7.d.f.ip6.arpa."),
|
|
}
|
|
for i := 64; i <= 127; i++ {
|
|
fqdn, err = dnsname.ToFQDN(fmt.Sprintf("%d.100.in-addr.arpa.", i))
|
|
if err != nil {
|
|
// TODO: propagate error
|
|
continue
|
|
}
|
|
ret = append(ret, fqdn)
|
|
}
|
|
return ret
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var (
|
|
ipv4Default = netip.MustParsePrefix("0.0.0.0/0")
|
|
ipv6Default = netip.MustParsePrefix("::/0")
|
|
)
|
|
|
|
// peerRoutes returns the routerConfig.Routes to access peers.
|
|
// If there are over cgnatThreshold CGNAT routes, one big CGNAT route
|
|
// is used instead.
|
|
func peerRoutes(logf logger.Logf, peers []wgcfg.Peer, cgnatThreshold int) (routes []netip.Prefix) {
|
|
tsULA := tsaddr.TailscaleULARange()
|
|
cgNAT := tsaddr.CGNATRange()
|
|
var didULA bool
|
|
var cgNATIPs []netip.Prefix
|
|
for _, peer := range peers {
|
|
for _, aip := range peer.AllowedIPs {
|
|
aip = unmapIPPrefix(aip)
|
|
|
|
// Ensure that we're only accepting properly-masked
|
|
// prefixes; the control server should be masking
|
|
// these, so if we get them, skip.
|
|
if mm := aip.Masked(); aip != mm {
|
|
// To avoid a DoS where a peer could cause all
|
|
// reconfigs to fail by sending a bad prefix, we just
|
|
// skip, but don't error, on an unmasked route.
|
|
logf("advertised route %s from %s has non-address bits set; expected %s", aip, peer.PublicKey.ShortString(), mm)
|
|
continue
|
|
}
|
|
|
|
// Only add the Tailscale IPv6 ULA once, if we see anybody using part of it.
|
|
if aip.Addr().Is6() && aip.IsSingleIP() && tsULA.Contains(aip.Addr()) {
|
|
if !didULA {
|
|
didULA = true
|
|
routes = append(routes, tsULA)
|
|
}
|
|
continue
|
|
}
|
|
if aip.IsSingleIP() && cgNAT.Contains(aip.Addr()) {
|
|
cgNATIPs = append(cgNATIPs, aip)
|
|
} else {
|
|
routes = append(routes, aip)
|
|
}
|
|
}
|
|
}
|
|
if len(cgNATIPs) > cgnatThreshold {
|
|
// Probably the hello server. Just append one big route.
|
|
routes = append(routes, cgNAT)
|
|
} else {
|
|
routes = append(routes, cgNATIPs...)
|
|
}
|
|
|
|
tsaddr.SortPrefixes(routes)
|
|
return routes
|
|
}
|
|
|
|
// routerConfig produces a router.Config from a wireguard config and IPN prefs.
|
|
func (b *LocalBackend) routerConfig(cfg *wgcfg.Config, prefs ipn.PrefsView, oneCGNATRoute bool) *router.Config {
|
|
singleRouteThreshold := 10_000
|
|
if oneCGNATRoute {
|
|
singleRouteThreshold = 1
|
|
}
|
|
|
|
b.mu.Lock()
|
|
netfilterKind := b.capForcedNetfilter // protected by b.mu
|
|
b.mu.Unlock()
|
|
|
|
if prefs.NetfilterKind() != "" {
|
|
if netfilterKind != "" {
|
|
b.logf("nodeattr netfilter preference %s overridden by c2n pref %s", netfilterKind, prefs.NetfilterKind())
|
|
}
|
|
netfilterKind = prefs.NetfilterKind()
|
|
}
|
|
|
|
var doStatefulFiltering bool
|
|
if v, ok := prefs.NoStatefulFiltering().Get(); !ok {
|
|
// The stateful filtering preference isn't explicitly set; this is
|
|
// unexpected since we expect it to be set during the profile
|
|
// backfill, but to be safe let's enable stateful filtering
|
|
// absent further information.
|
|
doStatefulFiltering = true
|
|
b.logf("[unexpected] NoStatefulFiltering preference not set; enabling stateful filtering")
|
|
} else if v {
|
|
// The preferences explicitly say "no stateful filtering", so
|
|
// we don't do it.
|
|
doStatefulFiltering = false
|
|
} else {
|
|
// The preferences explicitly "do stateful filtering" is turned
|
|
// off, or to expand the double negative, to do stateful
|
|
// filtering. Do so.
|
|
doStatefulFiltering = true
|
|
}
|
|
|
|
rs := &router.Config{
|
|
LocalAddrs: unmapIPPrefixes(cfg.Addresses),
|
|
SubnetRoutes: unmapIPPrefixes(prefs.AdvertiseRoutes().AsSlice()),
|
|
SNATSubnetRoutes: !prefs.NoSNAT(),
|
|
StatefulFiltering: doStatefulFiltering,
|
|
NetfilterMode: prefs.NetfilterMode(),
|
|
Routes: peerRoutes(b.logf, cfg.Peers, singleRouteThreshold),
|
|
NetfilterKind: netfilterKind,
|
|
}
|
|
|
|
if distro.Get() == distro.Synology {
|
|
// Issue 1995: we don't use iptables on Synology.
|
|
rs.NetfilterMode = preftype.NetfilterOff
|
|
}
|
|
|
|
// Sanity check: we expect the control server to program both a v4
|
|
// and a v6 default route, if default routing is on. Fill in
|
|
// blackhole routes appropriately if we're missing some. This is
|
|
// likely to break some functionality, but if the user expressed a
|
|
// preference for routing remotely, we want to avoid leaking
|
|
// traffic at the expense of functionality.
|
|
if prefs.ExitNodeID() != "" || prefs.ExitNodeIP().IsValid() {
|
|
var default4, default6 bool
|
|
for _, route := range rs.Routes {
|
|
switch route {
|
|
case ipv4Default:
|
|
default4 = true
|
|
case ipv6Default:
|
|
default6 = true
|
|
}
|
|
if default4 && default6 {
|
|
break
|
|
}
|
|
}
|
|
if !default4 {
|
|
rs.Routes = append(rs.Routes, ipv4Default)
|
|
}
|
|
if !default6 {
|
|
rs.Routes = append(rs.Routes, ipv6Default)
|
|
}
|
|
internalIPs, externalIPs, err := internalAndExternalInterfaces()
|
|
if err != nil {
|
|
b.logf("failed to discover interface ips: %v", err)
|
|
}
|
|
switch runtime.GOOS {
|
|
case "linux", "windows", "darwin", "ios", "android":
|
|
rs.LocalRoutes = internalIPs // unconditionally allow access to guest VM networks
|
|
if prefs.ExitNodeAllowLANAccess() {
|
|
rs.LocalRoutes = append(rs.LocalRoutes, externalIPs...)
|
|
} else {
|
|
// Explicitly add routes to the local network so that we do not
|
|
// leak any traffic.
|
|
rs.Routes = append(rs.Routes, externalIPs...)
|
|
}
|
|
b.logf("allowing exit node access to local IPs: %v", rs.LocalRoutes)
|
|
default:
|
|
if prefs.ExitNodeAllowLANAccess() {
|
|
b.logf("warning: ExitNodeAllowLANAccess has no effect on " + runtime.GOOS)
|
|
}
|
|
}
|
|
}
|
|
|
|
if slices.ContainsFunc(rs.LocalAddrs, tsaddr.PrefixIs4) {
|
|
rs.Routes = append(rs.Routes, netip.PrefixFrom(tsaddr.TailscaleServiceIP(), 32))
|
|
}
|
|
|
|
return rs
|
|
}
|
|
|
|
func unmapIPPrefix(ipp netip.Prefix) netip.Prefix {
|
|
return netip.PrefixFrom(ipp.Addr().Unmap(), ipp.Bits())
|
|
}
|
|
|
|
func unmapIPPrefixes(ippsList ...[]netip.Prefix) (ret []netip.Prefix) {
|
|
for _, ipps := range ippsList {
|
|
for _, ipp := range ipps {
|
|
ret = append(ret, unmapIPPrefix(ipp))
|
|
}
|
|
}
|
|
return ret
|
|
}
|
|
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) applyPrefsToHostinfoLocked(hi *tailcfg.Hostinfo, prefs ipn.PrefsView) {
|
|
if h := prefs.Hostname(); h != "" {
|
|
hi.Hostname = h
|
|
}
|
|
hi.RoutableIPs = prefs.AdvertiseRoutes().AsSlice()
|
|
hi.RequestTags = prefs.AdvertiseTags().AsSlice()
|
|
hi.ShieldsUp = prefs.ShieldsUp()
|
|
hi.AllowsUpdate = envknob.AllowsRemoteUpdate() || prefs.AutoUpdate().Apply.EqualBool(true)
|
|
|
|
var sshHostKeys []string
|
|
if prefs.RunSSH() && envknob.CanSSHD() {
|
|
// TODO(bradfitz): this is called with b.mu held. Not ideal.
|
|
// If the filesystem gets wedged or something we could block for
|
|
// a long time. But probably fine.
|
|
var err error
|
|
sshHostKeys, err = b.getSSHHostKeyPublicStrings()
|
|
if err != nil {
|
|
b.logf("warning: unable to get SSH host keys, SSH will appear as disabled for this node: %v", err)
|
|
}
|
|
}
|
|
hi.SSH_HostKeys = sshHostKeys
|
|
|
|
// The Hostinfo.WantIngress field tells control whether this node wants to
|
|
// be wired up for ingress connections. If harmless if it's accidentally
|
|
// true; the actual policy is controlled in tailscaled by ServeConfig. But
|
|
// if this is accidentally false, then control may not configure DNS
|
|
// properly. This exists as an optimization to control to program fewer DNS
|
|
// records that have ingress enabled but are not actually being used.
|
|
hi.WireIngress = b.wantIngressLocked()
|
|
hi.AppConnector.Set(prefs.AppConnector().Advertise)
|
|
}
|
|
|
|
// enterState transitions the backend into newState, updating internal
|
|
// state and propagating events out as needed.
|
|
//
|
|
// TODO(danderson): while this isn't a lie, exactly, a ton of other
|
|
// places twiddle IPN internal state without going through here, so
|
|
// really this is more "one of several places in which random things
|
|
// happen".
|
|
func (b *LocalBackend) enterState(newState ipn.State) {
|
|
unlock := b.lockAndGetUnlock()
|
|
b.enterStateLockedOnEntry(newState, unlock)
|
|
}
|
|
|
|
// enterStateLockedOnEntry is like enterState but requires b.mu be held to call
|
|
// it, but it unlocks b.mu when done (via unlock, a once func).
|
|
func (b *LocalBackend) enterStateLockedOnEntry(newState ipn.State, unlock unlockOnce) {
|
|
oldState := b.state
|
|
b.state = newState
|
|
prefs := b.pm.CurrentPrefs()
|
|
|
|
// Some temporary (2024-05-05) debugging code to help us catch
|
|
// https://github.com/tailscale/tailscale/issues/11962 in the act.
|
|
if prefs.WantRunning() &&
|
|
prefs.ControlURLOrDefault() == ipn.DefaultControlURL &&
|
|
envknob.Bool("TS_PANIC_IF_HIT_MAIN_CONTROL") {
|
|
panic("[unexpected] use of main control server in integration test")
|
|
}
|
|
|
|
netMap := b.netMap
|
|
activeLogin := b.activeLogin
|
|
authURL := b.authURL
|
|
if newState == ipn.Running {
|
|
b.authURL = ""
|
|
b.authURLTime = time.Time{}
|
|
} else if oldState == ipn.Running {
|
|
// Transitioning away from running.
|
|
b.closePeerAPIListenersLocked()
|
|
}
|
|
b.pauseOrResumeControlClientLocked()
|
|
|
|
unlock.UnlockEarly()
|
|
|
|
// prefs may change irrespective of state; WantRunning should be explicitly
|
|
// set before potential early return even if the state is unchanged.
|
|
b.health.SetIPNState(newState.String(), prefs.Valid() && prefs.WantRunning())
|
|
if oldState == newState {
|
|
return
|
|
}
|
|
b.logf("Switching ipn state %v -> %v (WantRunning=%v, nm=%v)",
|
|
oldState, newState, prefs.WantRunning(), netMap != nil)
|
|
b.send(ipn.Notify{State: &newState})
|
|
|
|
switch newState {
|
|
case ipn.NeedsLogin:
|
|
systemd.Status("Needs login: %s", authURL)
|
|
if b.seamlessRenewalEnabled() {
|
|
break
|
|
}
|
|
b.blockEngineUpdates(true)
|
|
fallthrough
|
|
case ipn.Stopped:
|
|
err := b.e.Reconfig(&wgcfg.Config{}, &router.Config{}, &dns.Config{})
|
|
if err != nil {
|
|
b.logf("Reconfig(down): %v", err)
|
|
}
|
|
|
|
if authURL == "" {
|
|
systemd.Status("Stopped; run 'tailscale up' to log in")
|
|
}
|
|
case ipn.Starting, ipn.NeedsMachineAuth:
|
|
b.authReconfig()
|
|
// Needed so that UpdateEndpoints can run
|
|
b.e.RequestStatus()
|
|
case ipn.Running:
|
|
var addrStrs []string
|
|
addrs := netMap.GetAddresses()
|
|
for i := range addrs.Len() {
|
|
addrStrs = append(addrStrs, addrs.At(i).Addr().String())
|
|
}
|
|
systemd.Status("Connected; %s; %s", activeLogin, strings.Join(addrStrs, " "))
|
|
case ipn.NoState:
|
|
// Do nothing.
|
|
default:
|
|
b.logf("[unexpected] unknown newState %#v", newState)
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) hasNodeKeyLocked() bool {
|
|
// we can't use b.Prefs(), because it strips the keys, oops!
|
|
p := b.pm.CurrentPrefs()
|
|
return p.Valid() && p.Persist().Valid() && !p.Persist().PrivateNodeKey().IsZero()
|
|
}
|
|
|
|
// NodeKey returns the public node key.
|
|
func (b *LocalBackend) NodeKey() key.NodePublic {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if !b.hasNodeKeyLocked() {
|
|
return key.NodePublic{}
|
|
}
|
|
return b.pm.CurrentPrefs().Persist().PublicNodeKey()
|
|
}
|
|
|
|
// nextStateLocked returns the state the backend seems to be in, based on
|
|
// its internal state.
|
|
//
|
|
// b.mu must be held
|
|
func (b *LocalBackend) nextStateLocked() ipn.State {
|
|
var (
|
|
cc = b.cc
|
|
netMap = b.netMap
|
|
state = b.state
|
|
blocked = b.blocked
|
|
st = b.engineStatus
|
|
keyExpired = b.keyExpired
|
|
|
|
wantRunning = false
|
|
loggedOut = false
|
|
)
|
|
if p := b.pm.CurrentPrefs(); p.Valid() {
|
|
wantRunning = p.WantRunning()
|
|
loggedOut = p.LoggedOut()
|
|
}
|
|
|
|
switch {
|
|
case !wantRunning && !loggedOut && !blocked && b.hasNodeKeyLocked():
|
|
return ipn.Stopped
|
|
case netMap == nil:
|
|
if (cc != nil && cc.AuthCantContinue()) || loggedOut {
|
|
// Auth was interrupted or waiting for URL visit,
|
|
// so it won't proceed without human help.
|
|
return ipn.NeedsLogin
|
|
}
|
|
switch state {
|
|
case ipn.Stopped:
|
|
// If we were already in the Stopped state, then
|
|
// we can assume auth is in good shape (or we would
|
|
// have been in NeedsLogin), so transition to Starting
|
|
// right away.
|
|
return ipn.Starting
|
|
case ipn.NoState:
|
|
// Our first time connecting to control, and we
|
|
// don't know if we'll NeedsLogin or not yet.
|
|
// UIs should print "Loading..." in this state.
|
|
return ipn.NoState
|
|
case ipn.Starting, ipn.Running, ipn.NeedsLogin:
|
|
return state
|
|
default:
|
|
b.logf("unexpected no-netmap state transition for %v", state)
|
|
return state
|
|
}
|
|
case !wantRunning:
|
|
return ipn.Stopped
|
|
case keyExpired:
|
|
// NetMap must be non-nil for us to get here.
|
|
// The node key expired, need to relogin.
|
|
return ipn.NeedsLogin
|
|
case netMap.GetMachineStatus() != tailcfg.MachineAuthorized:
|
|
// TODO(crawshaw): handle tailcfg.MachineInvalid
|
|
return ipn.NeedsMachineAuth
|
|
case state == ipn.NeedsMachineAuth:
|
|
// (if we get here, we know MachineAuthorized == true)
|
|
return ipn.Starting
|
|
case state == ipn.Starting:
|
|
if st.NumLive > 0 || st.LiveDERPs > 0 {
|
|
return ipn.Running
|
|
} else {
|
|
return state
|
|
}
|
|
case state == ipn.Running:
|
|
return ipn.Running
|
|
default:
|
|
return ipn.Starting
|
|
}
|
|
}
|
|
|
|
// stateMachine updates the state machine state based on other things
|
|
// that have happened. It is invoked from the various callbacks that
|
|
// feed events into LocalBackend.
|
|
//
|
|
// TODO(apenwarr): use a channel or something to prevent reentrancy?
|
|
// Or maybe just call the state machine from fewer places.
|
|
func (b *LocalBackend) stateMachine() {
|
|
unlock := b.lockAndGetUnlock()
|
|
b.stateMachineLockedOnEntry(unlock)
|
|
}
|
|
|
|
// stateMachineLockedOnEntry is like stateMachine but requires b.mu be held to
|
|
// call it, but it unlocks b.mu when done (via unlock, a once func).
|
|
func (b *LocalBackend) stateMachineLockedOnEntry(unlock unlockOnce) {
|
|
b.enterStateLockedOnEntry(b.nextStateLocked(), unlock)
|
|
}
|
|
|
|
// lockAndGetUnlock locks b.mu and returns a sync.OnceFunc function that will
|
|
// unlock it at most once.
|
|
//
|
|
// This is all very unfortunate but exists as a guardrail against the
|
|
// unfortunate "lockedOnEntry" methods in this package (primarily
|
|
// enterStateLockedOnEntry) that require b.mu held to be locked on entry to the
|
|
// function but unlock the mutex on their way out. As a stepping stone to
|
|
// cleaning things up (as of 2024-04-06), we at least pass the unlock func
|
|
// around now and defer unlock in the caller to avoid missing unlocks and double
|
|
// unlocks. TODO(bradfitz,maisem): make the locking in this package more
|
|
// traditional (simple). See https://github.com/tailscale/tailscale/issues/11649
|
|
func (b *LocalBackend) lockAndGetUnlock() (unlock unlockOnce) {
|
|
b.mu.Lock()
|
|
var unlocked atomic.Bool
|
|
return func() bool {
|
|
if unlocked.CompareAndSwap(false, true) {
|
|
b.mu.Unlock()
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
}
|
|
|
|
// unlockOnce is a func that unlocks only b.mu the first time it's called.
|
|
// Therefore it can be safely deferred to catch error paths, without worrying
|
|
// about double unlocks if a different point in the code later needs to explicitly
|
|
// unlock it first as well. It reports whether it was unlocked.
|
|
type unlockOnce func() bool
|
|
|
|
// UnlockEarly unlocks the LocalBackend.mu. It panics if u returns false,
|
|
// indicating that this unlocker was already used.
|
|
//
|
|
// We're using this method to help us document & find the places that have
|
|
// atypical locking patterns. See
|
|
// https://github.com/tailscale/tailscale/issues/11649 for background.
|
|
//
|
|
// A normal unlock is a deferred one or an explicit b.mu.Unlock a few lines
|
|
// after the lock, without lots of control flow in-between. An "early" unlock is
|
|
// one that happens in weird places, like in various "LockedOnEntry" methods in
|
|
// this package that require the mutex to be locked on entry but unlock it
|
|
// somewhere in the middle (maybe several calls away) and then sometimes proceed
|
|
// to lock it again.
|
|
//
|
|
// The reason UnlockeEarly panics if already called is because these are the
|
|
// points at which it's assumed that the mutex is already held and it now needs
|
|
// to be released. If somebody already released it, that invariant was violated.
|
|
// On the other hand, simply calling u only returns false instead of panicking
|
|
// so you can defer it without care, confident you got all the error return
|
|
// paths which were previously done by hand.
|
|
func (u unlockOnce) UnlockEarly() {
|
|
if !u() {
|
|
panic("Unlock on already-called unlockOnce")
|
|
}
|
|
}
|
|
|
|
// stopEngineAndWait deconfigures the local network data plane, and
|
|
// waits for it to deliver a status update before returning.
|
|
//
|
|
// TODO(danderson): this may be racy. We could unblock upon receiving
|
|
// a status update that predates the "I've shut down" update.
|
|
func (b *LocalBackend) stopEngineAndWait() {
|
|
b.logf("stopEngineAndWait...")
|
|
b.e.Reconfig(&wgcfg.Config{}, &router.Config{}, &dns.Config{})
|
|
b.requestEngineStatusAndWait()
|
|
b.logf("stopEngineAndWait: done.")
|
|
}
|
|
|
|
// Requests the wgengine status, and does not return until the status
|
|
// was delivered (to the usual callback).
|
|
func (b *LocalBackend) requestEngineStatusAndWait() {
|
|
b.logf("requestEngineStatusAndWait")
|
|
|
|
b.statusLock.Lock()
|
|
defer b.statusLock.Unlock()
|
|
|
|
go b.e.RequestStatus()
|
|
b.logf("requestEngineStatusAndWait: waiting...")
|
|
b.statusChanged.Wait() // temporarily releases lock while waiting
|
|
b.logf("requestEngineStatusAndWait: got status update.")
|
|
}
|
|
|
|
// setControlClientLocked sets the control client to cc,
|
|
// which may be nil.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) setControlClientLocked(cc controlclient.Client) {
|
|
b.cc = cc
|
|
b.ccAuto, _ = cc.(*controlclient.Auto)
|
|
}
|
|
|
|
// resetControlClientLocked sets b.cc to nil and returns the old value. If the
|
|
// returned value is non-nil, the caller must call Shutdown on it after
|
|
// releasing b.mu.
|
|
func (b *LocalBackend) resetControlClientLocked() controlclient.Client {
|
|
if b.cc == nil {
|
|
return nil
|
|
}
|
|
|
|
b.authURL = ""
|
|
|
|
// When we clear the control client, stop any outstanding netmap expiry
|
|
// timer; synthesizing a new netmap while we don't have a control
|
|
// client will break things.
|
|
//
|
|
// See https://github.com/tailscale/tailscale/issues/7392
|
|
if b.nmExpiryTimer != nil {
|
|
b.nmExpiryTimer.Stop()
|
|
b.nmExpiryTimer = nil
|
|
|
|
// Also bump the epoch to ensure that if the timer started, it
|
|
// will abort.
|
|
b.numClientStatusCalls.Add(1)
|
|
}
|
|
prev := b.cc
|
|
b.setControlClientLocked(nil)
|
|
return prev
|
|
}
|
|
|
|
// ResetForClientDisconnect resets the backend for GUI clients running
|
|
// in interactive (non-headless) mode. This is currently used only by
|
|
// Windows. This causes all state to be cleared, lest an unrelated user
|
|
// connect to tailscaled next. But it does not trigger a logout; we
|
|
// don't want to the user to have to reauthenticate in the future
|
|
// when they restart the GUI.
|
|
func (b *LocalBackend) ResetForClientDisconnect() {
|
|
b.logf("LocalBackend.ResetForClientDisconnect")
|
|
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
prevCC := b.resetControlClientLocked()
|
|
if prevCC != nil {
|
|
// Needs to happen without b.mu held.
|
|
defer prevCC.Shutdown()
|
|
}
|
|
|
|
b.setNetMapLocked(nil)
|
|
b.pm.Reset()
|
|
if b.currentUser != nil {
|
|
b.currentUser.Close()
|
|
b.currentUser = nil
|
|
}
|
|
b.keyExpired = false
|
|
b.authURL = ""
|
|
b.authURLTime = time.Time{}
|
|
b.activeLogin = ""
|
|
b.resetDialPlan()
|
|
b.setAtomicValuesFromPrefsLocked(ipn.PrefsView{})
|
|
b.enterStateLockedOnEntry(ipn.Stopped, unlock)
|
|
}
|
|
|
|
func (b *LocalBackend) ShouldRunSSH() bool { return b.sshAtomicBool.Load() && envknob.CanSSHD() }
|
|
|
|
// ShouldRunWebClient reports whether the web client is being run
|
|
// within this tailscaled instance. ShouldRunWebClient is safe to
|
|
// call regardless of whether b.mu is held or not.
|
|
func (b *LocalBackend) ShouldRunWebClient() bool { return b.webClientAtomicBool.Load() }
|
|
|
|
// ShouldExposeRemoteWebClient reports whether the web client should
|
|
// accept connections via [tailscale IP]:5252 in addition to the default
|
|
// behaviour of accepting local connections over 100.100.100.100.
|
|
//
|
|
// This function checks both the web client user pref via
|
|
// exposeRemoteWebClientAtomicBool and the disable-web-client node attr
|
|
// via ShouldRunWebClient to determine whether the web client should be
|
|
// exposed.
|
|
func (b *LocalBackend) ShouldExposeRemoteWebClient() bool {
|
|
return b.ShouldRunWebClient() && b.exposeRemoteWebClientAtomicBool.Load()
|
|
}
|
|
|
|
// setWebClientAtomicBoolLocked sets webClientAtomicBool based on whether
|
|
// tailcfg.NodeAttrDisableWebClient has been set in the netmap.NetworkMap.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) setWebClientAtomicBoolLocked(nm *netmap.NetworkMap) {
|
|
shouldRun := !nm.HasCap(tailcfg.NodeAttrDisableWebClient)
|
|
wasRunning := b.webClientAtomicBool.Swap(shouldRun)
|
|
if wasRunning && !shouldRun {
|
|
go b.webClientShutdown() // stop web client
|
|
}
|
|
}
|
|
|
|
// setExposeRemoteWebClientAtomicBoolLocked sets exposeRemoteWebClientAtomicBool
|
|
// based on whether the RunWebClient pref is set.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) setExposeRemoteWebClientAtomicBoolLocked(prefs ipn.PrefsView) {
|
|
shouldExpose := prefs.Valid() && prefs.RunWebClient()
|
|
b.exposeRemoteWebClientAtomicBool.Store(shouldExpose)
|
|
}
|
|
|
|
// ShouldHandleViaIP reports whether ip is an IPv6 address in the
|
|
// Tailscale ULA's v6 "via" range embedding an IPv4 address to be forwarded to
|
|
// by Tailscale.
|
|
func (b *LocalBackend) ShouldHandleViaIP(ip netip.Addr) bool {
|
|
if f, ok := b.containsViaIPFuncAtomic.LoadOk(); ok {
|
|
return f(ip)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// Logout logs out the current profile, if any, and waits for the logout to
|
|
// complete.
|
|
func (b *LocalBackend) Logout(ctx context.Context) error {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
if !b.hasNodeKeyLocked() {
|
|
// Already logged out.
|
|
return nil
|
|
}
|
|
cc := b.cc
|
|
|
|
// Grab the current profile before we unlock the mutex, so that we can
|
|
// delete it later.
|
|
profile := b.pm.CurrentProfile()
|
|
|
|
_, err := b.editPrefsLockedOnEntry(&ipn.MaskedPrefs{
|
|
WantRunningSet: true,
|
|
LoggedOutSet: true,
|
|
Prefs: ipn.Prefs{WantRunning: false, LoggedOut: true},
|
|
}, unlock)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// b.mu is now unlocked, after editPrefsLockedOnEntry.
|
|
|
|
// Clear any previous dial plan(s), if set.
|
|
b.resetDialPlan()
|
|
|
|
if cc == nil {
|
|
// Double Logout can happen via repeated IPN
|
|
// connections to ipnserver making it repeatedly
|
|
// transition from 1->0 total connections, which on
|
|
// Windows by default ("client mode") causes a Logout
|
|
// on the transition to zero.
|
|
// Previously this crashed when we asserted that c was non-nil
|
|
// here.
|
|
return errors.New("no controlclient")
|
|
}
|
|
|
|
if err := cc.Logout(ctx); err != nil {
|
|
return err
|
|
}
|
|
|
|
unlock = b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
if err := b.pm.DeleteProfile(profile.ID); err != nil {
|
|
b.logf("error deleting profile: %v", err)
|
|
return err
|
|
}
|
|
return b.resetForProfileChangeLockedOnEntry(unlock)
|
|
}
|
|
|
|
// setNetInfo sets b.hostinfo.NetInfo to ni, and passes ni along to the
|
|
// controlclient, if one exists.
|
|
func (b *LocalBackend) setNetInfo(ni *tailcfg.NetInfo) {
|
|
b.mu.Lock()
|
|
cc := b.cc
|
|
b.mu.Unlock()
|
|
|
|
if cc == nil {
|
|
return
|
|
}
|
|
cc.SetNetInfo(ni)
|
|
}
|
|
|
|
// setNetMapLocked updates the LocalBackend state to reflect the newly
|
|
// received nm. If nm is nil, it resets all configuration as though
|
|
// Tailscale is turned off.
|
|
func (b *LocalBackend) setNetMapLocked(nm *netmap.NetworkMap) {
|
|
b.dialer.SetNetMap(nm)
|
|
if ns, ok := b.sys.Netstack.GetOK(); ok {
|
|
ns.UpdateNetstackIPs(nm)
|
|
}
|
|
var login string
|
|
if nm != nil {
|
|
login = cmp.Or(nm.UserProfiles[nm.User()].LoginName, "<missing-profile>")
|
|
}
|
|
b.netMap = nm
|
|
b.updatePeersFromNetmapLocked(nm)
|
|
if login != b.activeLogin {
|
|
b.logf("active login: %v", login)
|
|
b.activeLogin = login
|
|
}
|
|
b.pauseOrResumeControlClientLocked()
|
|
|
|
if nm != nil {
|
|
b.health.SetControlHealth(nm.ControlHealth)
|
|
} else {
|
|
b.health.SetControlHealth(nil)
|
|
}
|
|
|
|
// Determine if file sharing is enabled
|
|
fs := nm.HasCap(tailcfg.CapabilityFileSharing)
|
|
if fs != b.capFileSharing {
|
|
osshare.SetFileSharingEnabled(fs, b.logf)
|
|
}
|
|
b.capFileSharing = fs
|
|
|
|
if nm.HasCap(tailcfg.NodeAttrLinuxMustUseIPTables) {
|
|
b.capForcedNetfilter = "iptables"
|
|
} else if nm.HasCap(tailcfg.NodeAttrLinuxMustUseNfTables) {
|
|
b.capForcedNetfilter = "nftables"
|
|
} else {
|
|
b.capForcedNetfilter = "" // empty string means client can auto-detect
|
|
}
|
|
|
|
b.MagicConn().SetSilentDisco(b.ControlKnobs().SilentDisco.Load())
|
|
b.MagicConn().SetProbeUDPLifetime(b.ControlKnobs().ProbeUDPLifetime.Load())
|
|
|
|
b.setDebugLogsByCapabilityLocked(nm)
|
|
|
|
// See the netns package for documentation on what this capability does.
|
|
netns.SetBindToInterfaceByRoute(nm.HasCap(tailcfg.CapabilityBindToInterfaceByRoute))
|
|
netns.SetDisableBindConnToInterface(nm.HasCap(tailcfg.CapabilityDebugDisableBindConnToInterface))
|
|
|
|
b.setTCPPortsInterceptedFromNetmapAndPrefsLocked(b.pm.CurrentPrefs())
|
|
if nm == nil {
|
|
b.nodeByAddr = nil
|
|
return
|
|
}
|
|
|
|
// Update the nodeByAddr index.
|
|
if b.nodeByAddr == nil {
|
|
b.nodeByAddr = map[netip.Addr]tailcfg.NodeID{}
|
|
}
|
|
// First pass, mark everything unwanted.
|
|
for k := range b.nodeByAddr {
|
|
b.nodeByAddr[k] = 0
|
|
}
|
|
addNode := func(n tailcfg.NodeView) {
|
|
for i := range n.Addresses().Len() {
|
|
if ipp := n.Addresses().At(i); ipp.IsSingleIP() {
|
|
b.nodeByAddr[ipp.Addr()] = n.ID()
|
|
}
|
|
}
|
|
}
|
|
if nm.SelfNode.Valid() {
|
|
addNode(nm.SelfNode)
|
|
}
|
|
for _, p := range nm.Peers {
|
|
addNode(p)
|
|
}
|
|
// Third pass, actually delete the unwanted items.
|
|
for k, v := range b.nodeByAddr {
|
|
if v == 0 {
|
|
delete(b.nodeByAddr, k)
|
|
}
|
|
}
|
|
|
|
b.updateDrivePeersLocked(nm)
|
|
b.driveNotifyCurrentSharesLocked()
|
|
}
|
|
|
|
func (b *LocalBackend) updatePeersFromNetmapLocked(nm *netmap.NetworkMap) {
|
|
if nm == nil {
|
|
b.peers = nil
|
|
return
|
|
}
|
|
|
|
// First pass, mark everything unwanted.
|
|
for k := range b.peers {
|
|
b.peers[k] = tailcfg.NodeView{}
|
|
}
|
|
|
|
// Second pass, add everything wanted.
|
|
for _, p := range nm.Peers {
|
|
mak.Set(&b.peers, p.ID(), p)
|
|
}
|
|
|
|
// Third pass, remove deleted things.
|
|
for k, v := range b.peers {
|
|
if !v.Valid() {
|
|
delete(b.peers, k)
|
|
}
|
|
}
|
|
}
|
|
|
|
// responseBodyWrapper wraps an io.ReadCloser and stores
|
|
// the number of bytesRead.
|
|
type responseBodyWrapper struct {
|
|
io.ReadCloser
|
|
bytesRx int64
|
|
bytesTx int64
|
|
log logger.Logf
|
|
method string
|
|
statusCode int
|
|
contentType string
|
|
fileExtension string
|
|
shareNodeKey string
|
|
selfNodeKey string
|
|
contentLength int64
|
|
}
|
|
|
|
// logAccess logs the taildrive: access: log line. If the logger is nil,
|
|
// the log will not be written.
|
|
func (rbw *responseBodyWrapper) logAccess(err string) {
|
|
if rbw.log == nil {
|
|
return
|
|
}
|
|
|
|
// Some operating systems create and copy lots of 0 length hidden files for
|
|
// tracking various states. Omit these to keep logs from being too verbose.
|
|
if rbw.contentLength > 0 {
|
|
rbw.log("taildrive: access: %s from %s to %s: status-code=%d ext=%q content-type=%q content-length=%.f tx=%.f rx=%.f err=%q", rbw.method, rbw.selfNodeKey, rbw.shareNodeKey, rbw.statusCode, rbw.fileExtension, rbw.contentType, roundTraffic(rbw.contentLength), roundTraffic(rbw.bytesTx), roundTraffic(rbw.bytesRx), err)
|
|
}
|
|
}
|
|
|
|
// Read implements the io.Reader interface.
|
|
func (rbw *responseBodyWrapper) Read(b []byte) (int, error) {
|
|
n, err := rbw.ReadCloser.Read(b)
|
|
rbw.bytesRx += int64(n)
|
|
if err != nil && !errors.Is(err, io.EOF) {
|
|
rbw.logAccess(err.Error())
|
|
}
|
|
|
|
return n, err
|
|
}
|
|
|
|
// Close implements the io.Close interface.
|
|
func (rbw *responseBodyWrapper) Close() error {
|
|
err := rbw.ReadCloser.Close()
|
|
var errStr string
|
|
if err != nil {
|
|
errStr = err.Error()
|
|
}
|
|
rbw.logAccess(errStr)
|
|
|
|
return err
|
|
}
|
|
|
|
// driveTransport is an http.RoundTripper that wraps
|
|
// b.Dialer().PeerAPITransport() with metrics tracking.
|
|
type driveTransport struct {
|
|
b *LocalBackend
|
|
tr *http.Transport
|
|
}
|
|
|
|
func (b *LocalBackend) newDriveTransport() *driveTransport {
|
|
return &driveTransport{
|
|
b: b,
|
|
tr: b.Dialer().PeerAPITransport(),
|
|
}
|
|
}
|
|
|
|
func (dt *driveTransport) RoundTrip(req *http.Request) (resp *http.Response, err error) {
|
|
// Some WebDAV clients include origin and refer headers, which peerapi does
|
|
// not like. Remove them.
|
|
req.Header.Del("origin")
|
|
req.Header.Del("referer")
|
|
|
|
bw := &requestBodyWrapper{}
|
|
if req.Body != nil {
|
|
bw.ReadCloser = req.Body
|
|
req.Body = bw
|
|
}
|
|
|
|
defer func() {
|
|
contentType := "unknown"
|
|
switch req.Method {
|
|
case httpm.PUT:
|
|
if ct := req.Header.Get("Content-Type"); ct != "" {
|
|
contentType = ct
|
|
}
|
|
case httpm.GET:
|
|
if ct := resp.Header.Get("Content-Type"); ct != "" {
|
|
contentType = ct
|
|
}
|
|
default:
|
|
return
|
|
}
|
|
|
|
dt.b.mu.Lock()
|
|
selfNodeKey := dt.b.netMap.SelfNode.Key().ShortString()
|
|
dt.b.mu.Unlock()
|
|
n, _, ok := dt.b.WhoIs(netip.MustParseAddrPort(req.URL.Host))
|
|
shareNodeKey := "unknown"
|
|
if ok {
|
|
shareNodeKey = string(n.Key().ShortString())
|
|
}
|
|
|
|
rbw := responseBodyWrapper{
|
|
log: dt.b.logf,
|
|
method: req.Method,
|
|
bytesTx: int64(bw.bytesRead),
|
|
selfNodeKey: selfNodeKey,
|
|
shareNodeKey: shareNodeKey,
|
|
contentType: contentType,
|
|
contentLength: resp.ContentLength,
|
|
fileExtension: parseDriveFileExtensionForLog(req.URL.Path),
|
|
statusCode: resp.StatusCode,
|
|
ReadCloser: resp.Body,
|
|
}
|
|
|
|
if resp.StatusCode >= 400 {
|
|
// in case of error response, just log immediately
|
|
rbw.logAccess("")
|
|
} else {
|
|
resp.Body = &rbw
|
|
}
|
|
}()
|
|
|
|
return dt.tr.RoundTrip(req)
|
|
}
|
|
|
|
// roundTraffic rounds bytes. This is used to preserve user privacy within logs.
|
|
func roundTraffic(bytes int64) float64 {
|
|
var x float64
|
|
switch {
|
|
case bytes <= 5:
|
|
return float64(bytes)
|
|
case bytes < 1000:
|
|
x = 10
|
|
case bytes < 10_000:
|
|
x = 100
|
|
case bytes < 100_000:
|
|
x = 1000
|
|
case bytes < 1_000_000:
|
|
x = 10_000
|
|
case bytes < 10_000_000:
|
|
x = 100_000
|
|
case bytes < 100_000_000:
|
|
x = 1_000_000
|
|
case bytes < 1_000_000_000:
|
|
x = 10_000_000
|
|
default:
|
|
x = 100_000_000
|
|
}
|
|
return math.Round(float64(bytes)/x) * x
|
|
}
|
|
|
|
// setDebugLogsByCapabilityLocked sets debug logging based on the self node's
|
|
// capabilities in the provided NetMap.
|
|
func (b *LocalBackend) setDebugLogsByCapabilityLocked(nm *netmap.NetworkMap) {
|
|
// These are sufficiently cheap (atomic bools) that we don't need to
|
|
// store state and compare.
|
|
if nm.HasCap(tailcfg.CapabilityDebugTSDNSResolution) {
|
|
dnscache.SetDebugLoggingEnabled(true)
|
|
} else {
|
|
dnscache.SetDebugLoggingEnabled(false)
|
|
}
|
|
}
|
|
|
|
// reloadServeConfigLocked reloads the serve config from the store or resets the
|
|
// serve config to nil if not logged in. The "changed" parameter, when false, instructs
|
|
// the method to only run the reset-logic and not reload the store from memory to ensure
|
|
// foreground sessions are not removed if they are not saved on disk.
|
|
func (b *LocalBackend) reloadServeConfigLocked(prefs ipn.PrefsView) {
|
|
if b.netMap == nil || !b.netMap.SelfNode.Valid() || !prefs.Valid() || b.pm.CurrentProfile().ID == "" {
|
|
// We're not logged in, so we don't have a profile.
|
|
// Don't try to load the serve config.
|
|
b.lastServeConfJSON = mem.B(nil)
|
|
b.serveConfig = ipn.ServeConfigView{}
|
|
return
|
|
}
|
|
|
|
confKey := ipn.ServeConfigKey(b.pm.CurrentProfile().ID)
|
|
// TODO(maisem,bradfitz): prevent reading the config from disk
|
|
// if the profile has not changed.
|
|
confj, err := b.store.ReadState(confKey)
|
|
if err != nil {
|
|
b.lastServeConfJSON = mem.B(nil)
|
|
b.serveConfig = ipn.ServeConfigView{}
|
|
return
|
|
}
|
|
if b.lastServeConfJSON.Equal(mem.B(confj)) {
|
|
return
|
|
}
|
|
b.lastServeConfJSON = mem.B(confj)
|
|
var conf ipn.ServeConfig
|
|
if err := json.Unmarshal(confj, &conf); err != nil {
|
|
b.logf("invalid ServeConfig %q in StateStore: %v", confKey, err)
|
|
b.serveConfig = ipn.ServeConfigView{}
|
|
return
|
|
}
|
|
|
|
// remove inactive sessions
|
|
maps.DeleteFunc(conf.Foreground, func(sessionID string, sc *ipn.ServeConfig) bool {
|
|
_, ok := b.notifyWatchers[sessionID]
|
|
return !ok
|
|
})
|
|
|
|
b.serveConfig = conf.View()
|
|
}
|
|
|
|
// setTCPPortsInterceptedFromNetmapAndPrefsLocked calls setTCPPortsIntercepted with
|
|
// the ports that tailscaled should handle as a function of b.netMap and b.prefs.
|
|
//
|
|
// b.mu must be held.
|
|
func (b *LocalBackend) setTCPPortsInterceptedFromNetmapAndPrefsLocked(prefs ipn.PrefsView) {
|
|
handlePorts := make([]uint16, 0, 4)
|
|
|
|
if prefs.Valid() && prefs.RunSSH() && envknob.CanSSHD() {
|
|
handlePorts = append(handlePorts, 22)
|
|
}
|
|
if b.ShouldExposeRemoteWebClient() {
|
|
handlePorts = append(handlePorts, webClientPort)
|
|
|
|
// don't listen on netmap addresses if we're in userspace mode
|
|
if !b.sys.IsNetstack() {
|
|
b.updateWebClientListenersLocked()
|
|
}
|
|
}
|
|
|
|
b.reloadServeConfigLocked(prefs)
|
|
if b.serveConfig.Valid() {
|
|
servePorts := make([]uint16, 0, 3)
|
|
b.serveConfig.RangeOverTCPs(func(port uint16, _ ipn.TCPPortHandlerView) bool {
|
|
if port > 0 {
|
|
servePorts = append(servePorts, uint16(port))
|
|
}
|
|
return true
|
|
})
|
|
handlePorts = append(handlePorts, servePorts...)
|
|
|
|
b.setServeProxyHandlersLocked()
|
|
|
|
// don't listen on netmap addresses if we're in userspace mode
|
|
if !b.sys.IsNetstack() {
|
|
b.updateServeTCPPortNetMapAddrListenersLocked(servePorts)
|
|
}
|
|
}
|
|
// Kick off a Hostinfo update to control if WireIngress changed.
|
|
if wire := b.wantIngressLocked(); b.hostinfo != nil && b.hostinfo.WireIngress != wire {
|
|
b.logf("Hostinfo.WireIngress changed to %v", wire)
|
|
b.hostinfo.WireIngress = wire
|
|
go b.doSetHostinfoFilterServices()
|
|
}
|
|
|
|
b.setTCPPortsIntercepted(handlePorts)
|
|
}
|
|
|
|
// setServeProxyHandlersLocked ensures there is an http proxy handler for each
|
|
// backend specified in serveConfig. It expects serveConfig to be valid and
|
|
// up-to-date, so should be called after reloadServeConfigLocked.
|
|
func (b *LocalBackend) setServeProxyHandlersLocked() {
|
|
if !b.serveConfig.Valid() {
|
|
return
|
|
}
|
|
var backends map[string]bool
|
|
b.serveConfig.RangeOverWebs(func(_ ipn.HostPort, conf ipn.WebServerConfigView) (cont bool) {
|
|
conf.Handlers().Range(func(_ string, h ipn.HTTPHandlerView) (cont bool) {
|
|
backend := h.Proxy()
|
|
if backend == "" {
|
|
// Only create proxy handlers for servers with a proxy backend.
|
|
return true
|
|
}
|
|
mak.Set(&backends, backend, true)
|
|
if _, ok := b.serveProxyHandlers.Load(backend); ok {
|
|
return true
|
|
}
|
|
|
|
b.logf("serve: creating a new proxy handler for %s", backend)
|
|
p, err := b.proxyHandlerForBackend(backend)
|
|
if err != nil {
|
|
// The backend endpoint (h.Proxy) should have been validated by expandProxyTarget
|
|
// in the CLI, so just log the error here.
|
|
b.logf("[unexpected] could not create proxy for %v: %s", backend, err)
|
|
return true
|
|
}
|
|
b.serveProxyHandlers.Store(backend, p)
|
|
return true
|
|
})
|
|
return true
|
|
})
|
|
|
|
// Clean up handlers for proxy backends that are no longer present
|
|
// in configuration.
|
|
b.serveProxyHandlers.Range(func(key, value any) bool {
|
|
backend := key.(string)
|
|
if !backends[backend] {
|
|
b.logf("serve: closing idle connections to %s", backend)
|
|
b.serveProxyHandlers.Delete(backend)
|
|
value.(*reverseProxy).close()
|
|
}
|
|
return true
|
|
})
|
|
}
|
|
|
|
// operatorUserName returns the current pref's OperatorUser's name, or the
|
|
// empty string if none.
|
|
func (b *LocalBackend) operatorUserName() string {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
prefs := b.pm.CurrentPrefs()
|
|
if !prefs.Valid() {
|
|
return ""
|
|
}
|
|
return prefs.OperatorUser()
|
|
}
|
|
|
|
// OperatorUserID returns the current pref's OperatorUser's ID (in
|
|
// os/user.User.Uid string form), or the empty string if none.
|
|
func (b *LocalBackend) OperatorUserID() string {
|
|
opUserName := b.operatorUserName()
|
|
if opUserName == "" {
|
|
return ""
|
|
}
|
|
u, err := user.Lookup(opUserName)
|
|
if err != nil {
|
|
b.logf("error looking up operator %q uid: %v", opUserName, err)
|
|
return ""
|
|
}
|
|
return u.Uid
|
|
}
|
|
|
|
// TestOnlyPublicKeys returns the current machine and node public
|
|
// keys. Used in tests only to facilitate automated node authorization
|
|
// in the test harness.
|
|
func (b *LocalBackend) TestOnlyPublicKeys() (machineKey key.MachinePublic, nodeKey key.NodePublic) {
|
|
b.mu.Lock()
|
|
machinePrivKey := b.machinePrivKey
|
|
prefs := b.pm.CurrentPrefs()
|
|
b.mu.Unlock()
|
|
|
|
if !prefs.Valid() || machinePrivKey.IsZero() {
|
|
return
|
|
}
|
|
|
|
mk := machinePrivKey.Public()
|
|
nk := prefs.Persist().PublicNodeKey()
|
|
return mk, nk
|
|
}
|
|
|
|
func (b *LocalBackend) removeFileWaiter(handle set.Handle) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
delete(b.fileWaiters, handle)
|
|
}
|
|
|
|
func (b *LocalBackend) addFileWaiter(wakeWaiter context.CancelFunc) set.Handle {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.fileWaiters.Add(wakeWaiter)
|
|
}
|
|
|
|
func (b *LocalBackend) WaitingFiles() ([]apitype.WaitingFile, error) {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
return mayDeref(apiSrv).taildrop.WaitingFiles()
|
|
}
|
|
|
|
// AwaitWaitingFiles is like WaitingFiles but blocks while ctx is not done,
|
|
// waiting for any files to be available.
|
|
//
|
|
// On return, exactly one of the results will be non-empty or non-nil,
|
|
// respectively.
|
|
func (b *LocalBackend) AwaitWaitingFiles(ctx context.Context) ([]apitype.WaitingFile, error) {
|
|
if ff, err := b.WaitingFiles(); err != nil || len(ff) > 0 {
|
|
return ff, err
|
|
}
|
|
|
|
for {
|
|
gotFile, gotFileCancel := context.WithCancel(context.Background())
|
|
defer gotFileCancel()
|
|
|
|
handle := b.addFileWaiter(gotFileCancel)
|
|
defer b.removeFileWaiter(handle)
|
|
|
|
// Now that we've registered ourselves, check again, in case
|
|
// of race. Otherwise there's a small window where we could
|
|
// miss a file arrival and wait forever.
|
|
if ff, err := b.WaitingFiles(); err != nil || len(ff) > 0 {
|
|
return ff, err
|
|
}
|
|
|
|
select {
|
|
case <-gotFile.Done():
|
|
if ff, err := b.WaitingFiles(); err != nil || len(ff) > 0 {
|
|
return ff, err
|
|
}
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) DeleteFile(name string) error {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
return mayDeref(apiSrv).taildrop.DeleteFile(name)
|
|
}
|
|
|
|
func (b *LocalBackend) OpenFile(name string) (rc io.ReadCloser, size int64, err error) {
|
|
b.mu.Lock()
|
|
apiSrv := b.peerAPIServer
|
|
b.mu.Unlock()
|
|
return mayDeref(apiSrv).taildrop.OpenFile(name)
|
|
}
|
|
|
|
// hasCapFileSharing reports whether the current node has the file
|
|
// sharing capability enabled.
|
|
func (b *LocalBackend) hasCapFileSharing() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.capFileSharing
|
|
}
|
|
|
|
// FileTargets lists nodes that the current node can send files to.
|
|
func (b *LocalBackend) FileTargets() ([]*apitype.FileTarget, error) {
|
|
var ret []*apitype.FileTarget
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
nm := b.netMap
|
|
if b.state != ipn.Running || nm == nil {
|
|
return nil, errors.New("not connected to the tailnet")
|
|
}
|
|
if !b.capFileSharing {
|
|
return nil, errors.New("file sharing not enabled by Tailscale admin")
|
|
}
|
|
for _, p := range b.peers {
|
|
if !b.peerIsTaildropTargetLocked(p) {
|
|
continue
|
|
}
|
|
if p.Hostinfo().OS() == "tvOS" {
|
|
continue
|
|
}
|
|
peerAPI := peerAPIBase(b.netMap, p)
|
|
if peerAPI == "" {
|
|
continue
|
|
}
|
|
ret = append(ret, &apitype.FileTarget{
|
|
Node: p.AsStruct(),
|
|
PeerAPIURL: peerAPI,
|
|
})
|
|
}
|
|
slices.SortFunc(ret, func(a, b *apitype.FileTarget) int {
|
|
return cmp.Compare(a.Node.Name, b.Node.Name)
|
|
})
|
|
return ret, nil
|
|
}
|
|
|
|
// peerIsTaildropTargetLocked reports whether p is a valid Taildrop file
|
|
// recipient from this node according to its ownership and the capabilities in
|
|
// the netmap.
|
|
//
|
|
// b.mu must be locked.
|
|
func (b *LocalBackend) peerIsTaildropTargetLocked(p tailcfg.NodeView) bool {
|
|
if b.netMap == nil || !p.Valid() {
|
|
return false
|
|
}
|
|
if b.netMap.User() == p.User() {
|
|
return true
|
|
}
|
|
if p.Addresses().Len() > 0 &&
|
|
b.peerHasCapLocked(p.Addresses().At(0).Addr(), tailcfg.PeerCapabilityFileSharingTarget) {
|
|
// Explicitly noted in the netmap ACL caps as a target.
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) peerHasCapLocked(addr netip.Addr, wantCap tailcfg.PeerCapability) bool {
|
|
return b.peerCapsLocked(addr).HasCapability(wantCap)
|
|
}
|
|
|
|
// SetDNS adds a DNS record for the given domain name & TXT record
|
|
// value.
|
|
//
|
|
// It's meant for use with dns-01 ACME (LetsEncrypt) challenges.
|
|
//
|
|
// This is the low-level interface. Other layers will provide more
|
|
// friendly options to get HTTPS certs.
|
|
func (b *LocalBackend) SetDNS(ctx context.Context, name, value string) error {
|
|
req := &tailcfg.SetDNSRequest{
|
|
Version: 1, // TODO(bradfitz,maisem): use tailcfg.CurrentCapabilityVersion when using the Noise transport
|
|
Type: "TXT",
|
|
Name: name,
|
|
Value: value,
|
|
}
|
|
|
|
b.mu.Lock()
|
|
cc := b.ccAuto
|
|
if prefs := b.pm.CurrentPrefs(); prefs.Valid() && prefs.Persist().Valid() {
|
|
req.NodeKey = prefs.Persist().PrivateNodeKey().Public()
|
|
}
|
|
b.mu.Unlock()
|
|
if cc == nil {
|
|
return errors.New("not connected")
|
|
}
|
|
if req.NodeKey.IsZero() {
|
|
return errors.New("no nodekey")
|
|
}
|
|
if name == "" {
|
|
return errors.New("missing 'name'")
|
|
}
|
|
if value == "" {
|
|
return errors.New("missing 'value'")
|
|
}
|
|
return cc.SetDNS(ctx, req)
|
|
}
|
|
|
|
func peerAPIPorts(peer tailcfg.NodeView) (p4, p6 uint16) {
|
|
svcs := peer.Hostinfo().Services()
|
|
for i := range svcs.Len() {
|
|
s := svcs.At(i)
|
|
switch s.Proto {
|
|
case tailcfg.PeerAPI4:
|
|
p4 = s.Port
|
|
case tailcfg.PeerAPI6:
|
|
p6 = s.Port
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// peerAPIURL returns an HTTP URL for the peer's peerapi service,
|
|
// without a trailing slash.
|
|
//
|
|
// If ip or port is the zero value then it returns the empty string.
|
|
func peerAPIURL(ip netip.Addr, port uint16) string {
|
|
if port == 0 || !ip.IsValid() {
|
|
return ""
|
|
}
|
|
return fmt.Sprintf("http://%v", netip.AddrPortFrom(ip, port))
|
|
}
|
|
|
|
// peerAPIBase returns the "http://ip:port" URL base to reach peer's peerAPI.
|
|
// It returns the empty string if the peer doesn't support the peerapi
|
|
// or there's no matching address family based on the netmap's own addresses.
|
|
func peerAPIBase(nm *netmap.NetworkMap, peer tailcfg.NodeView) string {
|
|
if nm == nil || !peer.Valid() || !peer.Hostinfo().Valid() {
|
|
return ""
|
|
}
|
|
|
|
var have4, have6 bool
|
|
addrs := nm.GetAddresses()
|
|
for i := range addrs.Len() {
|
|
a := addrs.At(i)
|
|
if !a.IsSingleIP() {
|
|
continue
|
|
}
|
|
switch {
|
|
case a.Addr().Is4():
|
|
have4 = true
|
|
case a.Addr().Is6():
|
|
have6 = true
|
|
}
|
|
}
|
|
p4, p6 := peerAPIPorts(peer)
|
|
switch {
|
|
case have4 && p4 != 0:
|
|
return peerAPIURL(nodeIP(peer, netip.Addr.Is4), p4)
|
|
case have6 && p6 != 0:
|
|
return peerAPIURL(nodeIP(peer, netip.Addr.Is6), p6)
|
|
}
|
|
return ""
|
|
}
|
|
|
|
func nodeIP(n tailcfg.NodeView, pred func(netip.Addr) bool) netip.Addr {
|
|
for i := range n.Addresses().Len() {
|
|
a := n.Addresses().At(i)
|
|
if a.IsSingleIP() && pred(a.Addr()) {
|
|
return a.Addr()
|
|
}
|
|
}
|
|
return netip.Addr{}
|
|
}
|
|
|
|
func (b *LocalBackend) CheckIPForwarding() error {
|
|
if b.sys.IsNetstackRouter() {
|
|
return nil
|
|
}
|
|
|
|
// TODO: let the caller pass in the ranges.
|
|
warn, err := netutil.CheckIPForwarding(tsaddr.ExitRoutes(), b.sys.NetMon.Get().InterfaceState())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return warn
|
|
}
|
|
|
|
// CheckUDPGROForwarding checks if the machine is optimally configured to
|
|
// forward UDP packets between the default route and Tailscale TUN interfaces.
|
|
// It returns an error if the check fails or if suboptimal configuration is
|
|
// detected. No error is returned if we are unable to gather the interface
|
|
// names from the relevant subsystems.
|
|
func (b *LocalBackend) CheckUDPGROForwarding() error {
|
|
if b.sys.IsNetstackRouter() {
|
|
return nil
|
|
}
|
|
// We return nil when the interface name or subsystem it's tied to can't be
|
|
// fetched. This is intentional as answering the question "are netdev
|
|
// features optimal for performance?" is a low priority in that situation.
|
|
tunSys, ok := b.sys.Tun.GetOK()
|
|
if !ok {
|
|
return nil
|
|
}
|
|
tunInterface, err := tunSys.Name()
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
netmonSys, ok := b.sys.NetMon.GetOK()
|
|
if !ok {
|
|
return nil
|
|
}
|
|
state := netmonSys.InterfaceState()
|
|
if state == nil {
|
|
return nil
|
|
}
|
|
// We return warn or err. If err is non-nil there was a problem
|
|
// communicating with the kernel via ethtool semantics/ioctl. ethtool ioctl
|
|
// errors are interesting for our future selves as we consider tweaking
|
|
// netdev features automatically using similar API infra.
|
|
warn, err := netkernelconf.CheckUDPGROForwarding(tunInterface, state.DefaultRouteInterface)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return warn
|
|
}
|
|
|
|
// DERPMap returns the current DERPMap in use, or nil if not connected.
|
|
func (b *LocalBackend) DERPMap() *tailcfg.DERPMap {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.netMap == nil {
|
|
return nil
|
|
}
|
|
return b.netMap.DERPMap
|
|
}
|
|
|
|
// OfferingExitNode reports whether b is currently offering exit node
|
|
// access.
|
|
func (b *LocalBackend) OfferingExitNode() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if !b.pm.CurrentPrefs().Valid() {
|
|
return false
|
|
}
|
|
var def4, def6 bool
|
|
ar := b.pm.CurrentPrefs().AdvertiseRoutes()
|
|
for i := range ar.Len() {
|
|
r := ar.At(i)
|
|
if r.Bits() != 0 {
|
|
continue
|
|
}
|
|
if r.Addr().Is4() {
|
|
def4 = true
|
|
} else if r.Addr().Is6() {
|
|
def6 = true
|
|
}
|
|
}
|
|
return def4 && def6
|
|
}
|
|
|
|
// OfferingAppConnector reports whether b is currently offering app
|
|
// connector services.
|
|
func (b *LocalBackend) OfferingAppConnector() bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.appConnector != nil
|
|
}
|
|
|
|
// allowExitNodeDNSProxyToServeName reports whether the Exit Node DNS
|
|
// proxy is allowed to serve responses for the provided DNS name.
|
|
func (b *LocalBackend) allowExitNodeDNSProxyToServeName(name string) bool {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
nm := b.netMap
|
|
if nm == nil {
|
|
return false
|
|
}
|
|
name = strings.ToLower(name)
|
|
for _, bad := range nm.DNS.ExitNodeFilteredSet {
|
|
if bad == "" {
|
|
// Invalid, ignore.
|
|
continue
|
|
}
|
|
if bad[0] == '.' {
|
|
// Entries beginning with a dot are suffix matches.
|
|
if dnsname.HasSuffix(name, bad) {
|
|
return false
|
|
}
|
|
continue
|
|
}
|
|
// Otherwise entries are exact matches. They're
|
|
// guaranteed to be lowercase already.
|
|
if name == bad {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// SetExpiry updates the expiry of the current node key to t, as long as it's
|
|
// only sooner than the old expiry.
|
|
//
|
|
// If t is in the past, the key is expired immediately.
|
|
// If t is after the current expiry, an error is returned.
|
|
func (b *LocalBackend) SetExpirySooner(ctx context.Context, expiry time.Time) error {
|
|
b.mu.Lock()
|
|
cc := b.ccAuto
|
|
b.mu.Unlock()
|
|
if cc == nil {
|
|
return errors.New("not running")
|
|
}
|
|
return cc.SetExpirySooner(ctx, expiry)
|
|
}
|
|
|
|
// exitNodeCanProxyDNS reports the DoH base URL ("http://foo/dns-query") without query parameters
|
|
// to exitNodeID's DoH service, if available.
|
|
//
|
|
// If exitNodeID is the zero valid, it returns "", false.
|
|
func exitNodeCanProxyDNS(nm *netmap.NetworkMap, peers map[tailcfg.NodeID]tailcfg.NodeView, exitNodeID tailcfg.StableNodeID) (dohURL string, ok bool) {
|
|
if exitNodeID.IsZero() {
|
|
return "", false
|
|
}
|
|
for _, p := range peers {
|
|
if p.StableID() == exitNodeID && peerCanProxyDNS(p) {
|
|
return peerAPIBase(nm, p) + "/dns-query", true
|
|
}
|
|
}
|
|
return "", false
|
|
}
|
|
|
|
// wireguardExitNodeDNSResolvers returns the DNS resolvers to use for a
|
|
// WireGuard-only exit node, if it has resolver addresses.
|
|
func wireguardExitNodeDNSResolvers(nm *netmap.NetworkMap, peers map[tailcfg.NodeID]tailcfg.NodeView, exitNodeID tailcfg.StableNodeID) ([]*dnstype.Resolver, bool) {
|
|
if exitNodeID.IsZero() {
|
|
return nil, false
|
|
}
|
|
|
|
for _, p := range peers {
|
|
if p.StableID() == exitNodeID {
|
|
if p.IsWireGuardOnly() {
|
|
resolvers := p.ExitNodeDNSResolvers()
|
|
if !resolvers.IsNil() && resolvers.Len() > 0 {
|
|
copies := make([]*dnstype.Resolver, resolvers.Len())
|
|
for i := range resolvers.Len() {
|
|
copies[i] = resolvers.At(i).AsStruct()
|
|
}
|
|
return copies, true
|
|
}
|
|
}
|
|
return nil, false
|
|
}
|
|
}
|
|
|
|
return nil, false
|
|
}
|
|
|
|
func peerCanProxyDNS(p tailcfg.NodeView) bool {
|
|
if p.Cap() >= 26 {
|
|
// Actually added at 25
|
|
// (https://github.com/tailscale/tailscale/blob/3ae6f898cfdb58fd0e30937147dd6ce28c6808dd/tailcfg/tailcfg.go#L51)
|
|
// so anything >= 26 can do it.
|
|
return true
|
|
}
|
|
// If p.Cap is not populated (e.g. older control server), then do the old
|
|
// thing of searching through services.
|
|
services := p.Hostinfo().Services()
|
|
for i := range services.Len() {
|
|
if s := services.At(i); s.Proto == tailcfg.PeerAPIDNS && s.Port >= 1 {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) DebugRebind() error {
|
|
b.MagicConn().Rebind()
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) DebugReSTUN() error {
|
|
b.MagicConn().ReSTUN("explicit-debug")
|
|
return nil
|
|
}
|
|
|
|
// ControlKnobs returns the node's control knobs.
|
|
func (b *LocalBackend) ControlKnobs() *controlknobs.Knobs {
|
|
return b.sys.ControlKnobs()
|
|
}
|
|
|
|
// MagicConn returns the backend's *magicsock.Conn.
|
|
func (b *LocalBackend) MagicConn() *magicsock.Conn {
|
|
return b.sys.MagicSock.Get()
|
|
}
|
|
|
|
type keyProvingNoiseRoundTripper struct {
|
|
b *LocalBackend
|
|
}
|
|
|
|
func (n keyProvingNoiseRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
|
|
b := n.b
|
|
|
|
var priv key.NodePrivate
|
|
|
|
b.mu.Lock()
|
|
cc := b.ccAuto
|
|
if nm := b.netMap; nm != nil {
|
|
priv = nm.PrivateKey
|
|
}
|
|
b.mu.Unlock()
|
|
if cc == nil {
|
|
return nil, errors.New("no client")
|
|
}
|
|
if priv.IsZero() {
|
|
return nil, errors.New("no netmap or private key")
|
|
}
|
|
rt, ep, err := cc.GetSingleUseNoiseRoundTripper(req.Context())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if ep == nil || ep.NodeKeyChallenge.IsZero() {
|
|
go rt.RoundTrip(new(http.Request)) // return our reservation with a bogus request
|
|
return nil, errors.New("this coordination server does not support API calls over the Noise channel")
|
|
}
|
|
|
|
// QueryEscape the node key since it has a colon in it.
|
|
nk := url.QueryEscape(priv.Public().String())
|
|
req.SetBasicAuth(nk, "")
|
|
|
|
// genNodeProofHeaderValue returns the Tailscale-Node-Proof header's value to prove
|
|
// to chalPub that we control claimedPrivate.
|
|
genNodeProofHeaderValue := func(claimedPrivate key.NodePrivate, chalPub key.ChallengePublic) string {
|
|
// TODO(bradfitz): cache this somewhere?
|
|
box := claimedPrivate.SealToChallenge(chalPub, []byte(chalPub.String()))
|
|
return claimedPrivate.Public().String() + " " + base64.StdEncoding.EncodeToString(box)
|
|
}
|
|
|
|
// And prove we have the private key corresponding to the public key sent
|
|
// tin the basic auth username.
|
|
req.Header.Set("Tailscale-Node-Proof", genNodeProofHeaderValue(priv, ep.NodeKeyChallenge))
|
|
|
|
return rt.RoundTrip(req)
|
|
}
|
|
|
|
// KeyProvingNoiseRoundTripper returns an http.RoundTripper that uses the LocalBackend's
|
|
// DoNoiseRequest method and mutates the request to add an authorization header
|
|
// to prove the client's nodekey.
|
|
func (b *LocalBackend) KeyProvingNoiseRoundTripper() http.RoundTripper {
|
|
return keyProvingNoiseRoundTripper{b}
|
|
}
|
|
|
|
// DoNoiseRequest sends a request to URL over the control plane
|
|
// Noise connection.
|
|
func (b *LocalBackend) DoNoiseRequest(req *http.Request) (*http.Response, error) {
|
|
b.mu.Lock()
|
|
cc := b.ccAuto
|
|
b.mu.Unlock()
|
|
if cc == nil {
|
|
return nil, errors.New("no client")
|
|
}
|
|
return cc.DoNoiseRequest(req)
|
|
}
|
|
|
|
func (b *LocalBackend) sshServerOrInit() (_ SSHServer, err error) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.sshServer != nil {
|
|
return b.sshServer, nil
|
|
}
|
|
if newSSHServer == nil {
|
|
return nil, errors.New("no SSH server support")
|
|
}
|
|
b.sshServer, err = newSSHServer(b.logf, b)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("newSSHServer: %w", err)
|
|
}
|
|
return b.sshServer, nil
|
|
}
|
|
|
|
var warnSSHSELinux = health.NewWarnable()
|
|
|
|
func (b *LocalBackend) updateSELinuxHealthWarning() {
|
|
if hostinfo.IsSELinuxEnforcing() {
|
|
b.health.SetWarnable(warnSSHSELinux, errors.New("SELinux is enabled; Tailscale SSH may not work. See https://tailscale.com/s/ssh-selinux"))
|
|
} else {
|
|
b.health.SetWarnable(warnSSHSELinux, nil)
|
|
}
|
|
}
|
|
|
|
func (b *LocalBackend) handleSSHConn(c net.Conn) (err error) {
|
|
s, err := b.sshServerOrInit()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
b.updateSELinuxHealthWarning()
|
|
return s.HandleSSHConn(c)
|
|
}
|
|
|
|
// HandleQuad100Port80Conn serves http://100.100.100.100/ on port 80 (and
|
|
// the equivalent tsaddr.TailscaleServiceIPv6 address).
|
|
func (b *LocalBackend) HandleQuad100Port80Conn(c net.Conn) error {
|
|
var s http.Server
|
|
s.Handler = http.HandlerFunc(b.handleQuad100Port80Conn)
|
|
return s.Serve(netutil.NewOneConnListener(c, nil))
|
|
}
|
|
|
|
func validQuad100Host(h string) bool {
|
|
switch h {
|
|
case "",
|
|
tsaddr.TailscaleServiceIPString,
|
|
tsaddr.TailscaleServiceIPv6String,
|
|
"[" + tsaddr.TailscaleServiceIPv6String + "]":
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (b *LocalBackend) handleQuad100Port80Conn(w http.ResponseWriter, r *http.Request) {
|
|
w.Header().Set("X-Frame-Options", "DENY")
|
|
w.Header().Set("Content-Security-Policy", "default-src 'self';")
|
|
if r.Method != "GET" && r.Method != "HEAD" {
|
|
http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
|
|
return
|
|
}
|
|
if !validQuad100Host(r.Host) {
|
|
http.Error(w, "bad request", http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
io.WriteString(w, "<h1>Tailscale</h1>\n")
|
|
if b.netMap == nil {
|
|
io.WriteString(w, "No netmap.\n")
|
|
return
|
|
}
|
|
addrs := b.netMap.GetAddresses()
|
|
if addrs.Len() == 0 {
|
|
io.WriteString(w, "No local addresses.\n")
|
|
return
|
|
}
|
|
io.WriteString(w, "<p>Local addresses:</p><ul>\n")
|
|
for i := range addrs.Len() {
|
|
fmt.Fprintf(w, "<li>%v</li>\n", addrs.At(i).Addr())
|
|
}
|
|
io.WriteString(w, "</ul>\n")
|
|
}
|
|
|
|
func (b *LocalBackend) Doctor(ctx context.Context, logf logger.Logf) {
|
|
// We can write logs too fast for logtail to handle, even when
|
|
// opting-out of rate limits. Limit ourselves to at most one message
|
|
// per 20ms and a burst of 60 log lines, which should be fast enough to
|
|
// not block for too long but slow enough that we can upload all lines.
|
|
logf = logger.SlowLoggerWithClock(ctx, logf, 20*time.Millisecond, 60, b.clock.Now)
|
|
|
|
var checks []doctor.Check
|
|
checks = append(checks,
|
|
permissions.Check{},
|
|
routetable.Check{},
|
|
ethtool.Check{},
|
|
)
|
|
|
|
// Print a log message if any of the global DNS resolvers are Tailscale
|
|
// IPs; this can interfere with our ability to connect to the Tailscale
|
|
// controlplane.
|
|
checks = append(checks, doctor.CheckFunc("dns-resolvers", func(_ context.Context, logf logger.Logf) error {
|
|
b.mu.Lock()
|
|
nm := b.netMap
|
|
b.mu.Unlock()
|
|
if nm == nil {
|
|
return nil
|
|
}
|
|
|
|
for i, resolver := range nm.DNS.Resolvers {
|
|
ipp, ok := resolver.IPPort()
|
|
if ok && tsaddr.IsTailscaleIP(ipp.Addr()) {
|
|
logf("resolver %d is a Tailscale address: %v", i, resolver)
|
|
}
|
|
}
|
|
for i, resolver := range nm.DNS.FallbackResolvers {
|
|
ipp, ok := resolver.IPPort()
|
|
if ok && tsaddr.IsTailscaleIP(ipp.Addr()) {
|
|
logf("fallback resolver %d is a Tailscale address: %v", i, resolver)
|
|
}
|
|
}
|
|
return nil
|
|
}))
|
|
|
|
// TODO(andrew): more
|
|
|
|
numChecks := len(checks)
|
|
checks = append(checks, doctor.CheckFunc("numchecks", func(_ context.Context, log logger.Logf) error {
|
|
log("%d checks", numChecks)
|
|
return nil
|
|
}))
|
|
|
|
doctor.RunChecks(ctx, logf, checks...)
|
|
}
|
|
|
|
// SetDevStateStore updates the LocalBackend's state storage to the provided values.
|
|
//
|
|
// It's meant only for development.
|
|
func (b *LocalBackend) SetDevStateStore(key, value string) error {
|
|
if b.store == nil {
|
|
return errors.New("no state store")
|
|
}
|
|
err := ipn.WriteState(b.store, ipn.StateKey(key), []byte(value))
|
|
b.logf("SetDevStateStore(%q, %q) = %v", key, value, err)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.setTCPPortsInterceptedFromNetmapAndPrefsLocked(b.pm.CurrentPrefs())
|
|
|
|
return nil
|
|
}
|
|
|
|
// ShouldInterceptTCPPort reports whether the given TCP port number to a
|
|
// Tailscale IP (not a subnet router, service IP, etc) should be intercepted by
|
|
// Tailscaled and handled in-process.
|
|
func (b *LocalBackend) ShouldInterceptTCPPort(port uint16) bool {
|
|
return b.shouldInterceptTCPPortAtomic.Load()(port)
|
|
}
|
|
|
|
// SwitchProfile switches to the profile with the given id.
|
|
// It will restart the backend on success.
|
|
// If the profile is not known, it returns an errProfileNotFound.
|
|
func (b *LocalBackend) SwitchProfile(profile ipn.ProfileID) error {
|
|
if b.CurrentProfile().ID == profile {
|
|
return nil
|
|
}
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
oldControlURL := b.pm.CurrentPrefs().ControlURLOrDefault()
|
|
if err := b.pm.SwitchProfile(profile); err != nil {
|
|
return err
|
|
}
|
|
|
|
// As an optimization, only reset the dialPlan if the control URL
|
|
// changed; we treat an empty URL as "unknown" and always reset.
|
|
newControlURL := b.pm.CurrentPrefs().ControlURLOrDefault()
|
|
if oldControlURL != newControlURL || oldControlURL == "" || newControlURL == "" {
|
|
b.resetDialPlan()
|
|
}
|
|
|
|
return b.resetForProfileChangeLockedOnEntry(unlock)
|
|
}
|
|
|
|
func (b *LocalBackend) initTKALocked() error {
|
|
cp := b.pm.CurrentProfile()
|
|
if cp.ID == "" {
|
|
b.tka = nil
|
|
return nil
|
|
}
|
|
if b.tka != nil {
|
|
if b.tka.profile == cp.ID {
|
|
// Already initialized.
|
|
return nil
|
|
}
|
|
// As we're switching profiles, we need to reset the TKA to nil.
|
|
b.tka = nil
|
|
}
|
|
root := b.TailscaleVarRoot()
|
|
if root == "" {
|
|
b.tka = nil
|
|
b.logf("network-lock unavailable; no state directory")
|
|
return nil
|
|
}
|
|
|
|
chonkDir := b.chonkPathLocked()
|
|
if _, err := os.Stat(chonkDir); err == nil {
|
|
// The directory exists, which means network-lock has been initialized.
|
|
storage, err := tka.ChonkDir(chonkDir)
|
|
if err != nil {
|
|
return fmt.Errorf("opening tailchonk: %v", err)
|
|
}
|
|
authority, err := tka.Open(storage)
|
|
if err != nil {
|
|
return fmt.Errorf("initializing tka: %v", err)
|
|
}
|
|
if err := authority.Compact(storage, tkaCompactionDefaults); err != nil {
|
|
b.logf("tka compaction failed: %v", err)
|
|
}
|
|
|
|
b.tka = &tkaState{
|
|
profile: cp.ID,
|
|
authority: authority,
|
|
storage: storage,
|
|
}
|
|
b.logf("tka initialized at head %x", authority.Head())
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// resetDialPlan resets the dialPlan for this LocalBackend. It will log if
|
|
// anything is reset.
|
|
//
|
|
// It is safe to call this concurrently, with or without b.mu held.
|
|
func (b *LocalBackend) resetDialPlan() {
|
|
old := b.dialPlan.Swap(nil)
|
|
if old != nil {
|
|
b.logf("resetDialPlan: did reset")
|
|
}
|
|
}
|
|
|
|
// resetForProfileChangeLockedOnEntry resets the backend for a profile change.
|
|
//
|
|
// b.mu must held on entry. It is released on exit.
|
|
func (b *LocalBackend) resetForProfileChangeLockedOnEntry(unlock unlockOnce) error {
|
|
defer unlock()
|
|
|
|
if b.shutdownCalled {
|
|
// Prevent a call back to Start during Shutdown, which calls Logout for
|
|
// ephemeral nodes, which can then call back here. But we're shutting
|
|
// down, so no need to do any work.
|
|
return nil
|
|
}
|
|
b.setNetMapLocked(nil) // Reset netmap.
|
|
// Reset the NetworkMap in the engine
|
|
b.e.SetNetworkMap(new(netmap.NetworkMap))
|
|
if err := b.initTKALocked(); err != nil {
|
|
return err
|
|
}
|
|
b.lastServeConfJSON = mem.B(nil)
|
|
b.serveConfig = ipn.ServeConfigView{}
|
|
b.lastSuggestedExitNode = lastSuggestedExitNode{} // Reset last suggested exit node.
|
|
b.enterStateLockedOnEntry(ipn.NoState, unlock) // Reset state; releases b.mu
|
|
b.health.SetLocalLogConfigHealth(nil)
|
|
return b.Start(ipn.Options{})
|
|
}
|
|
|
|
// DeleteProfile deletes a profile with the given ID.
|
|
// If the profile is not known, it is a no-op.
|
|
func (b *LocalBackend) DeleteProfile(p ipn.ProfileID) error {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
needToRestart := b.pm.CurrentProfile().ID == p
|
|
if err := b.pm.DeleteProfile(p); err != nil {
|
|
if err == errProfileNotFound {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
if !needToRestart {
|
|
return nil
|
|
}
|
|
return b.resetForProfileChangeLockedOnEntry(unlock)
|
|
}
|
|
|
|
// CurrentProfile returns the current LoginProfile.
|
|
// The value may be zero if the profile is not persisted.
|
|
func (b *LocalBackend) CurrentProfile() ipn.LoginProfile {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.pm.CurrentProfile()
|
|
}
|
|
|
|
// NewProfile creates and switches to the new profile.
|
|
func (b *LocalBackend) NewProfile() error {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
b.pm.NewProfile()
|
|
|
|
// The new profile doesn't yet have a ControlURL because it hasn't been
|
|
// set. Conservatively reset the dialPlan.
|
|
b.resetDialPlan()
|
|
|
|
return b.resetForProfileChangeLockedOnEntry(unlock)
|
|
}
|
|
|
|
// ListProfiles returns a list of all LoginProfiles.
|
|
func (b *LocalBackend) ListProfiles() []ipn.LoginProfile {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
return b.pm.Profiles()
|
|
}
|
|
|
|
// ResetAuth resets the authentication state, including persisted keys. Also
|
|
// has the side effect of removing all profiles and reseting preferences. The
|
|
// backend is left with a new profile, ready for StartLoginInterative to be
|
|
// called to register it as new node.
|
|
func (b *LocalBackend) ResetAuth() error {
|
|
unlock := b.lockAndGetUnlock()
|
|
defer unlock()
|
|
|
|
prevCC := b.resetControlClientLocked()
|
|
if prevCC != nil {
|
|
defer prevCC.Shutdown() // call must happen after release b.mu
|
|
}
|
|
if err := b.clearMachineKeyLocked(); err != nil {
|
|
return err
|
|
}
|
|
if err := b.pm.DeleteAllProfiles(); err != nil {
|
|
return err
|
|
}
|
|
b.resetDialPlan() // always reset if we're removing everything
|
|
return b.resetForProfileChangeLockedOnEntry(unlock)
|
|
}
|
|
|
|
// StreamDebugCapture writes a pcap stream of packets traversing
|
|
// tailscaled to the provided response writer.
|
|
func (b *LocalBackend) StreamDebugCapture(ctx context.Context, w io.Writer) error {
|
|
var s *capture.Sink
|
|
|
|
b.mu.Lock()
|
|
if b.debugSink == nil {
|
|
s = capture.New()
|
|
b.debugSink = s
|
|
b.e.InstallCaptureHook(s.LogPacket)
|
|
} else {
|
|
s = b.debugSink
|
|
}
|
|
b.mu.Unlock()
|
|
|
|
unregister := s.RegisterOutput(w)
|
|
|
|
select {
|
|
case <-ctx.Done():
|
|
case <-s.WaitCh():
|
|
}
|
|
unregister()
|
|
|
|
// Shut down & uninstall the sink if there are no longer
|
|
// any outputs on it.
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
|
|
select {
|
|
case <-b.ctx.Done():
|
|
return nil
|
|
default:
|
|
}
|
|
if b.debugSink != nil && b.debugSink.NumOutputs() == 0 {
|
|
s := b.debugSink
|
|
b.e.InstallCaptureHook(nil)
|
|
b.debugSink = nil
|
|
return s.Close()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (b *LocalBackend) GetPeerEndpointChanges(ctx context.Context, ip netip.Addr) ([]magicsock.EndpointChange, error) {
|
|
pip, ok := b.e.PeerForIP(ip)
|
|
if !ok {
|
|
return nil, fmt.Errorf("no matching peer")
|
|
}
|
|
if pip.IsSelf {
|
|
return nil, fmt.Errorf("%v is local Tailscale IP", ip)
|
|
}
|
|
peer := pip.Node
|
|
|
|
chs, err := b.MagicConn().GetEndpointChanges(peer)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("getting endpoint changes: %w", err)
|
|
}
|
|
return chs, nil
|
|
}
|
|
|
|
var breakTCPConns func() error
|
|
|
|
func (b *LocalBackend) DebugBreakTCPConns() error {
|
|
if breakTCPConns == nil {
|
|
return errors.New("TCP connection breaking not available on this platform")
|
|
}
|
|
return breakTCPConns()
|
|
}
|
|
|
|
func (b *LocalBackend) DebugBreakDERPConns() error {
|
|
return b.MagicConn().DebugBreakDERPConns()
|
|
}
|
|
|
|
func (b *LocalBackend) pushSelfUpdateProgress(up ipnstate.UpdateProgress) {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.selfUpdateProgress = append(b.selfUpdateProgress, up)
|
|
b.lastSelfUpdateState = up.Status
|
|
}
|
|
|
|
func (b *LocalBackend) clearSelfUpdateProgress() {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
b.selfUpdateProgress = make([]ipnstate.UpdateProgress, 0)
|
|
b.lastSelfUpdateState = ipnstate.UpdateFinished
|
|
}
|
|
|
|
func (b *LocalBackend) GetSelfUpdateProgress() []ipnstate.UpdateProgress {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
res := make([]ipnstate.UpdateProgress, len(b.selfUpdateProgress))
|
|
copy(res, b.selfUpdateProgress)
|
|
return res
|
|
}
|
|
|
|
func (b *LocalBackend) DoSelfUpdate() {
|
|
b.mu.Lock()
|
|
updateState := b.lastSelfUpdateState
|
|
b.mu.Unlock()
|
|
// don't start an update if one is already in progress
|
|
if updateState == ipnstate.UpdateInProgress {
|
|
return
|
|
}
|
|
b.clearSelfUpdateProgress()
|
|
b.pushSelfUpdateProgress(ipnstate.NewUpdateProgress(ipnstate.UpdateInProgress, ""))
|
|
up, err := clientupdate.NewUpdater(clientupdate.Arguments{
|
|
Logf: func(format string, args ...any) {
|
|
b.pushSelfUpdateProgress(ipnstate.NewUpdateProgress(ipnstate.UpdateInProgress, fmt.Sprintf(format, args...)))
|
|
},
|
|
})
|
|
if err != nil {
|
|
b.pushSelfUpdateProgress(ipnstate.NewUpdateProgress(ipnstate.UpdateFailed, err.Error()))
|
|
}
|
|
err = up.Update()
|
|
if err != nil {
|
|
b.pushSelfUpdateProgress(ipnstate.NewUpdateProgress(ipnstate.UpdateFailed, err.Error()))
|
|
} else {
|
|
b.pushSelfUpdateProgress(ipnstate.NewUpdateProgress(ipnstate.UpdateFinished, "tailscaled did not restart; please restart Tailscale manually."))
|
|
}
|
|
}
|
|
|
|
// ObserveDNSResponse passes a DNS response from the PeerAPI DNS server to the
|
|
// App Connector to enable route discovery.
|
|
func (b *LocalBackend) ObserveDNSResponse(res []byte) {
|
|
var appConnector *appc.AppConnector
|
|
b.mu.Lock()
|
|
if b.appConnector == nil {
|
|
b.mu.Unlock()
|
|
return
|
|
}
|
|
appConnector = b.appConnector
|
|
b.mu.Unlock()
|
|
|
|
appConnector.ObserveDNSResponse(res)
|
|
}
|
|
|
|
// ErrDisallowedAutoRoute is returned by AdvertiseRoute when a route that is not allowed is requested.
|
|
var ErrDisallowedAutoRoute = errors.New("route is not allowed")
|
|
|
|
// AdvertiseRoute implements the appc.RouteAdvertiser interface. It sets a new
|
|
// route advertisement if one is not already present in the existing routes.
|
|
// If the route is disallowed, ErrDisallowedAutoRoute is returned.
|
|
func (b *LocalBackend) AdvertiseRoute(ipps ...netip.Prefix) error {
|
|
finalRoutes := b.Prefs().AdvertiseRoutes().AsSlice()
|
|
newRoutes := false
|
|
|
|
for _, ipp := range ipps {
|
|
if !allowedAutoRoute(ipp) {
|
|
continue
|
|
}
|
|
if slices.Contains(finalRoutes, ipp) {
|
|
continue
|
|
}
|
|
|
|
// If the new prefix is already contained by existing routes, skip it.
|
|
if coveredRouteRangeNoDefault(finalRoutes, ipp) {
|
|
continue
|
|
}
|
|
|
|
finalRoutes = append(finalRoutes, ipp)
|
|
newRoutes = true
|
|
}
|
|
|
|
if !newRoutes {
|
|
return nil
|
|
}
|
|
|
|
_, err := b.EditPrefs(&ipn.MaskedPrefs{
|
|
Prefs: ipn.Prefs{
|
|
AdvertiseRoutes: finalRoutes,
|
|
},
|
|
AdvertiseRoutesSet: true,
|
|
})
|
|
return err
|
|
}
|
|
|
|
// coveredRouteRangeNoDefault checks if a route is already included in a slice of
|
|
// prefixes, ignoring default routes in the range.
|
|
func coveredRouteRangeNoDefault(finalRoutes []netip.Prefix, ipp netip.Prefix) bool {
|
|
for _, r := range finalRoutes {
|
|
if r == tsaddr.AllIPv4() || r == tsaddr.AllIPv6() {
|
|
continue
|
|
}
|
|
if ipp.IsSingleIP() {
|
|
if r.Contains(ipp.Addr()) {
|
|
return true
|
|
}
|
|
} else {
|
|
if r.Contains(ipp.Addr()) && r.Contains(netipx.PrefixLastIP(ipp)) {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// UnadvertiseRoute implements the appc.RouteAdvertiser interface. It removes
|
|
// a route advertisement if one is present in the existing routes.
|
|
func (b *LocalBackend) UnadvertiseRoute(toRemove ...netip.Prefix) error {
|
|
currentRoutes := b.Prefs().AdvertiseRoutes().AsSlice()
|
|
finalRoutes := currentRoutes[:0]
|
|
|
|
for _, ipp := range currentRoutes {
|
|
if slices.Contains(toRemove, ipp) {
|
|
continue
|
|
}
|
|
finalRoutes = append(finalRoutes, ipp)
|
|
}
|
|
|
|
_, err := b.EditPrefs(&ipn.MaskedPrefs{
|
|
Prefs: ipn.Prefs{
|
|
AdvertiseRoutes: finalRoutes,
|
|
},
|
|
AdvertiseRoutesSet: true,
|
|
})
|
|
return err
|
|
}
|
|
|
|
// namespace a key with the profile manager's current profile key, if any
|
|
func namespaceKeyForCurrentProfile(pm *profileManager, key ipn.StateKey) ipn.StateKey {
|
|
return pm.CurrentProfile().Key + "||" + key
|
|
}
|
|
|
|
const routeInfoStateStoreKey ipn.StateKey = "_routeInfo"
|
|
|
|
func (b *LocalBackend) storeRouteInfo(ri *appc.RouteInfo) error {
|
|
b.mu.Lock()
|
|
defer b.mu.Unlock()
|
|
if b.pm.CurrentProfile().ID == "" {
|
|
return nil
|
|
}
|
|
key := namespaceKeyForCurrentProfile(b.pm, routeInfoStateStoreKey)
|
|
bs, err := json.Marshal(ri)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return b.pm.WriteState(key, bs)
|
|
}
|
|
|
|
func (b *LocalBackend) readRouteInfoLocked() (*appc.RouteInfo, error) {
|
|
if b.pm.CurrentProfile().ID == "" {
|
|
return &appc.RouteInfo{}, nil
|
|
}
|
|
key := namespaceKeyForCurrentProfile(b.pm, routeInfoStateStoreKey)
|
|
bs, err := b.pm.Store().ReadState(key)
|
|
ri := &appc.RouteInfo{}
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if err := json.Unmarshal(bs, ri); err != nil {
|
|
return nil, err
|
|
}
|
|
return ri, nil
|
|
}
|
|
|
|
// seamlessRenewalEnabled reports whether seamless key renewals are enabled
|
|
// (i.e. we saw our self node with the SeamlessKeyRenewal attr in a netmap).
|
|
// This enables beta functionality of renewing node keys without breaking
|
|
// connections.
|
|
func (b *LocalBackend) seamlessRenewalEnabled() bool {
|
|
return b.ControlKnobs().SeamlessKeyRenewal.Load()
|
|
}
|
|
|
|
var (
|
|
disallowedAddrs = []netip.Addr{
|
|
netip.MustParseAddr("::1"),
|
|
netip.MustParseAddr("::"),
|
|
netip.MustParseAddr("0.0.0.0"),
|
|
}
|
|
disallowedRanges = []netip.Prefix{
|
|
netip.MustParsePrefix("127.0.0.0/8"),
|
|
netip.MustParsePrefix("224.0.0.0/4"),
|
|
netip.MustParsePrefix("ff00::/8"),
|
|
}
|
|
)
|
|
|
|
// allowedAutoRoute determines if the route being added via AdvertiseRoute (the app connector featuge) should be allowed.
|
|
func allowedAutoRoute(ipp netip.Prefix) bool {
|
|
// Note: blocking the addrs for globals, not solely the prefixes.
|
|
for _, addr := range disallowedAddrs {
|
|
if ipp.Addr() == addr {
|
|
return false
|
|
}
|
|
}
|
|
for _, pfx := range disallowedRanges {
|
|
if pfx.Overlaps(ipp) {
|
|
return false
|
|
}
|
|
}
|
|
// TODO(raggi): exclude tailscale service IPs and so on as well.
|
|
return true
|
|
}
|
|
|
|
// mayDeref dereferences p if non-nil, otherwise it returns the zero value.
|
|
func mayDeref[T any](p *T) (v T) {
|
|
if p == nil {
|
|
return v
|
|
}
|
|
return *p
|
|
}
|
|
|
|
var ErrNoPreferredDERP = errors.New("no preferred DERP, try again later")
|
|
var ErrCannotSuggestExitNode = errors.New("unable to suggest an exit node, try again later")
|
|
var ErrUnableToSuggestLastExitNode = errors.New("unable to suggest last exit node")
|
|
|
|
// SuggestExitNode computes a suggestion based on the current netmap and last netcheck report. If
|
|
// there are multiple equally good options, one is selected at random, so the result is not stable. To be
|
|
// eligible for consideration, the peer must have NodeAttrSuggestExitNode in its CapMap.
|
|
//
|
|
// Currently, peers with a DERP home are preferred over those without (typically this means Mullvad).
|
|
// Peers are selected based on having a DERP home that is the lowest latency to this device. For peers
|
|
// without a DERP home, we look for geographic proximity to this device's DERP home.
|
|
func (b *LocalBackend) SuggestExitNode() (response apitype.ExitNodeSuggestionResponse, err error) {
|
|
b.mu.Lock()
|
|
lastReport := b.MagicConn().GetLastNetcheckReport(b.ctx)
|
|
netMap := b.netMap
|
|
lastSuggestedExitNode := b.lastSuggestedExitNode
|
|
b.mu.Unlock()
|
|
if lastReport == nil || netMap == nil {
|
|
last, err := lastSuggestedExitNode.asAPIType()
|
|
if err != nil {
|
|
return response, ErrCannotSuggestExitNode
|
|
}
|
|
return last, err
|
|
}
|
|
seed := time.Now().UnixNano()
|
|
r := rand.New(rand.NewSource(seed))
|
|
res, err := suggestExitNode(lastReport, netMap, r)
|
|
if err != nil {
|
|
last, err := lastSuggestedExitNode.asAPIType()
|
|
if err != nil {
|
|
return response, ErrCannotSuggestExitNode
|
|
}
|
|
return last, err
|
|
}
|
|
b.mu.Lock()
|
|
b.lastSuggestedExitNode.id = res.ID
|
|
b.lastSuggestedExitNode.name = res.Name
|
|
b.mu.Unlock()
|
|
return res, err
|
|
}
|
|
|
|
// asAPIType formats a response with the last suggested exit node's ID and name.
|
|
// Returns error if there is no id or name.
|
|
// Used as a fallback before returning a nil response and error.
|
|
func (n lastSuggestedExitNode) asAPIType() (res apitype.ExitNodeSuggestionResponse, _ error) {
|
|
if n.id != "" && n.name != "" {
|
|
res.ID = n.id
|
|
res.Name = n.name
|
|
return res, nil
|
|
}
|
|
return res, ErrUnableToSuggestLastExitNode
|
|
}
|
|
|
|
func suggestExitNode(report *netcheck.Report, netMap *netmap.NetworkMap, r *rand.Rand) (res apitype.ExitNodeSuggestionResponse, err error) {
|
|
if report.PreferredDERP == 0 {
|
|
return res, ErrNoPreferredDERP
|
|
}
|
|
candidates := make([]tailcfg.NodeView, 0, len(netMap.Peers))
|
|
for _, peer := range netMap.Peers {
|
|
if peer.CapMap().Has(tailcfg.NodeAttrSuggestExitNode) && tsaddr.ContainsExitRoutes(peer.AllowedIPs()) {
|
|
candidates = append(candidates, peer)
|
|
}
|
|
}
|
|
if len(candidates) == 0 {
|
|
return res, nil
|
|
}
|
|
if len(candidates) == 1 {
|
|
peer := candidates[0]
|
|
if hi := peer.Hostinfo(); hi.Valid() {
|
|
if loc := hi.Location(); loc != nil {
|
|
res.Location = loc.View()
|
|
}
|
|
}
|
|
res.ID = peer.StableID()
|
|
res.Name = peer.Name()
|
|
return res, nil
|
|
}
|
|
|
|
candidatesByRegion := make(map[int][]tailcfg.NodeView, len(netMap.DERPMap.Regions))
|
|
var preferredDERP *tailcfg.DERPRegion = netMap.DERPMap.Regions[report.PreferredDERP]
|
|
var minDistance float64 = math.MaxFloat64
|
|
type nodeDistance struct {
|
|
nv tailcfg.NodeView
|
|
distance float64 // in meters, approximately
|
|
}
|
|
distances := make([]nodeDistance, 0, len(candidates))
|
|
for _, c := range candidates {
|
|
if !c.Valid() {
|
|
continue
|
|
}
|
|
if c.DERP() != "" {
|
|
ipp, err := netip.ParseAddrPort(c.DERP())
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if ipp.Addr() != tailcfg.DerpMagicIPAddr {
|
|
continue
|
|
}
|
|
regionID := int(ipp.Port())
|
|
candidatesByRegion[regionID] = append(candidatesByRegion[regionID], c)
|
|
continue
|
|
}
|
|
if len(candidatesByRegion) > 0 {
|
|
// Since a candidate exists that does have a DERP home, skip this candidate. We never select
|
|
// a candidate without a DERP home if there is a candidate available with a DERP home.
|
|
continue
|
|
}
|
|
// This candidate does not have a DERP home.
|
|
// Use geographic distance from our DERP home to estimate how good this candidate is.
|
|
hi := c.Hostinfo()
|
|
if !hi.Valid() {
|
|
continue
|
|
}
|
|
loc := hi.Location()
|
|
if loc == nil {
|
|
continue
|
|
}
|
|
distance := longLatDistance(preferredDERP.Latitude, preferredDERP.Longitude, loc.Latitude, loc.Longitude)
|
|
if distance < minDistance {
|
|
minDistance = distance
|
|
}
|
|
distances = append(distances, nodeDistance{nv: c, distance: distance})
|
|
}
|
|
// First, try to select an exit node that has the closest DERP home, based on lastReport's DERP latency.
|
|
// If there are no latency values, it returns an arbitrary region
|
|
if len(candidatesByRegion) > 0 {
|
|
minRegion := minLatencyDERPRegion(xmaps.Keys(candidatesByRegion), report)
|
|
if minRegion == 0 {
|
|
minRegion = randomRegion(xmaps.Keys(candidatesByRegion), r)
|
|
}
|
|
regionCandidates, ok := candidatesByRegion[minRegion]
|
|
if !ok {
|
|
return res, errors.New("no candidates in expected region: this is a bug")
|
|
}
|
|
chosen := randomNode(regionCandidates, r)
|
|
res.ID = chosen.StableID()
|
|
res.Name = chosen.Name()
|
|
if hi := chosen.Hostinfo(); hi.Valid() {
|
|
if loc := hi.Location(); loc != nil {
|
|
res.Location = loc.View()
|
|
}
|
|
}
|
|
return res, nil
|
|
}
|
|
// None of the candidates have a DERP home, so proceed to select based on geographical distance from our preferred DERP region.
|
|
|
|
// allowanceMeters is the extra distance that will be permitted when considering peers. By this point, there
|
|
// are multiple approximations taking place (DERP location standing in for this device's location, the peer's
|
|
// location may only be city granularity, the distance algorithm assumes a spherical planet, etc.) so it is
|
|
// reasonable to consider peers that are similar distances. Those peers are good enough to be within
|
|
// measurement error. 100km corresponds to approximately 1ms of additional round trip light
|
|
// propagation delay in a fiber optic cable and seems like a reasonable heuristic. It may be adjusted in
|
|
// future.
|
|
const allowanceMeters = 100000
|
|
pickFrom := make([]tailcfg.NodeView, 0, len(distances))
|
|
for _, candidate := range distances {
|
|
if candidate.nv.Valid() && candidate.distance <= minDistance+allowanceMeters {
|
|
pickFrom = append(pickFrom, candidate.nv)
|
|
}
|
|
}
|
|
chosen := pickWeighted(pickFrom)
|
|
if !chosen.Valid() {
|
|
return res, errors.New("chosen candidate invalid: this is a bug")
|
|
}
|
|
res.ID = chosen.StableID()
|
|
res.Name = chosen.Name()
|
|
if hi := chosen.Hostinfo(); hi.Valid() {
|
|
if loc := hi.Location(); loc != nil {
|
|
res.Location = loc.View()
|
|
}
|
|
}
|
|
return res, nil
|
|
}
|
|
|
|
// pickWeighted chooses the node with highest priority given a list of mullvad nodes.
|
|
func pickWeighted(candidates []tailcfg.NodeView) tailcfg.NodeView {
|
|
maxWeight := 0
|
|
var best tailcfg.NodeView
|
|
for _, c := range candidates {
|
|
hi := c.Hostinfo()
|
|
if !hi.Valid() {
|
|
continue
|
|
}
|
|
loc := hi.Location()
|
|
if loc == nil || loc.Priority <= maxWeight {
|
|
continue
|
|
}
|
|
maxWeight = loc.Priority
|
|
best = c
|
|
}
|
|
return best
|
|
}
|
|
|
|
// randomNode chooses a node randomly given a list of nodes and a *rand.Rand.
|
|
func randomNode(nodes []tailcfg.NodeView, r *rand.Rand) tailcfg.NodeView {
|
|
return nodes[r.Intn(len(nodes))]
|
|
}
|
|
|
|
// randomRegion chooses a region randomly given a list of ints and a *rand.Rand
|
|
func randomRegion(regions []int, r *rand.Rand) int {
|
|
if testenv.InTest() {
|
|
regions = slices.Clone(regions)
|
|
slices.Sort(regions)
|
|
}
|
|
return regions[r.Intn(len(regions))]
|
|
}
|
|
|
|
// minLatencyDERPRegion returns the region with the lowest latency value given the last netcheck report.
|
|
// If there are no latency values, it returns 0.
|
|
func minLatencyDERPRegion(regions []int, report *netcheck.Report) int {
|
|
min := slices.MinFunc(regions, func(i, j int) int {
|
|
const largeDuration time.Duration = math.MaxInt64
|
|
iLatency, ok := report.RegionLatency[i]
|
|
if !ok {
|
|
iLatency = largeDuration
|
|
}
|
|
jLatency, ok := report.RegionLatency[j]
|
|
if !ok {
|
|
jLatency = largeDuration
|
|
}
|
|
if c := cmp.Compare(iLatency, jLatency); c != 0 {
|
|
return c
|
|
}
|
|
return cmp.Compare(i, j)
|
|
})
|
|
latency, ok := report.RegionLatency[min]
|
|
if !ok || latency == 0 {
|
|
return 0
|
|
} else {
|
|
return min
|
|
}
|
|
}
|
|
|
|
// longLatDistance returns an estimated distance given the geographic coordinates of two locations, in degrees.
|
|
// The coordinates are separated into four separate float64 values.
|
|
// Value is returned in meters.
|
|
func longLatDistance(fromLat, fromLong, toLat, toLong float64) float64 {
|
|
const toRadians = math.Pi / 180
|
|
diffLat := (fromLat - toLat) * toRadians
|
|
diffLong := (fromLong - toLong) * toRadians
|
|
lat1 := fromLat * toRadians
|
|
lat2 := toLat * toRadians
|
|
a := math.Pow(math.Sin(diffLat/2), 2) + math.Cos(lat1)*math.Cos(lat2)*math.Pow(math.Sin(diffLong/2), 2)
|
|
const earthRadiusMeters = 6371000
|
|
c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
|
|
return earthRadiusMeters * c
|
|
}
|