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tailscale/tailcfg/tailcfg.go

1297 lines
44 KiB
Go

// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tailcfg
//go:generate go run tailscale.com/cmd/cloner --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode --clonefunc=true --output=tailcfg_clone.go
import (
"encoding/hex"
"errors"
"fmt"
"reflect"
"strings"
"time"
"go4.org/mem"
"inet.af/netaddr"
"tailscale.com/types/dnstype"
"tailscale.com/types/key"
"tailscale.com/types/opt"
"tailscale.com/types/structs"
"tailscale.com/util/dnsname"
)
// CurrentMapRequestVersion is the current MapRequest.Version value.
//
// History of versions:
// 3: implicit compression, keep-alives
// 4: opt-in keep-alives via KeepAlive field, opt-in compression via Compress
// 5: 2020-10-19, implies IncludeIPv6, delta Peers/UserProfiles, supports MagicDNS
// 6: 2020-12-07: means MapResponse.PacketFilter nil means unchanged
// 7: 2020-12-15: FilterRule.SrcIPs accepts CIDRs+ranges, doesn't warn about 0.0.0.0/::
// 8: 2020-12-19: client can buggily receive IPv6 addresses and routes if beta enabled server-side
// 9: 2020-12-30: client doesn't auto-add implicit search domains from peers; only DNSConfig.Domains
// 10: 2021-01-17: client understands MapResponse.PeerSeenChange
// 11: 2021-03-03: client understands IPv6, multiple default routes, and goroutine dumping
// 12: 2021-03-04: client understands PingRequest
// 13: 2021-03-19: client understands FilterRule.IPProto
// 14: 2021-04-07: client understands DNSConfig.Routes and DNSConfig.Resolvers
// 15: 2021-04-12: client treats nil MapResponse.DNSConfig as meaning unchanged
// 16: 2021-04-15: client understands Node.Online, MapResponse.OnlineChange
// 17: 2021-04-18: MapResponse.Domain empty means unchanged
// 18: 2021-04-19: MapResponse.Node nil means unchanged (all fields now omitempty)
// 19: 2021-04-21: MapResponse.Debug.SleepSeconds
// 20: 2021-06-11: MapResponse.LastSeen used even less (https://github.com/tailscale/tailscale/issues/2107)
// 21: 2021-06-15: added MapResponse.DNSConfig.CertDomains
// 22: 2021-06-16: added MapResponse.DNSConfig.ExtraRecords
// 23: 2021-08-25: DNSConfig.Routes values may be empty (for ExtraRecords support in 1.14.1+)
// 24: 2021-09-18: MapResponse.Health from control to node; node shows in "tailscale status"
const CurrentMapRequestVersion = 24
type StableID string
type ID int64
type UserID ID
func (u UserID) IsZero() bool {
return u == 0
}
type LoginID ID
func (u LoginID) IsZero() bool {
return u == 0
}
type NodeID ID
func (u NodeID) IsZero() bool {
return u == 0
}
type StableNodeID StableID
func (u StableNodeID) IsZero() bool {
return u == ""
}
// NodeKey is the WireGuard public key for a node.
//
// Deprecated: prefer to use key.NodePublic instead. If you must have
// a NodeKey, use NodePublic.AsNodeKey.
type NodeKey = key.NodeKey
// DiscoKey is the curve25519 public key for path discovery key.
// It's never written to disk or reused between network start-ups.
type DiscoKey [32]byte
// DiscoKeyFromNodePublic returns k converted to a DiscoKey.
//
// Deprecated: exists only as a compatibility bridge while DiscoKey
// gets removed from the codebase. Do not introduce new uses that
// aren't related to #3206.
func DiscoKeyFromDiscoPublic(k key.DiscoPublic) DiscoKey {
return k.Raw32()
}
// User is an IPN user.
//
// A user can have multiple logins associated with it (e.g. gmail and github oauth).
// (Note: none of our UIs support this yet.)
//
// Some properties are inhereted from the logins and can be overridden, such as
// display name and profile picture.
//
// Other properties must be the same for all logins associated with a user.
// In particular: domain. If a user has a "tailscale.io" domain login, they cannot
// have a general gmail address login associated with the user.
type User struct {
ID UserID
LoginName string `json:"-"` // not stored, filled from Login // TODO REMOVE
DisplayName string // if non-empty overrides Login field
ProfilePicURL string // if non-empty overrides Login field
Domain string
Logins []LoginID
Created time.Time
}
type Login struct {
_ structs.Incomparable
ID LoginID
Provider string
LoginName string
DisplayName string
ProfilePicURL string
Domain string
}
// A UserProfile is display-friendly data for a user.
// It includes the LoginName for display purposes but *not* the Provider.
// It also includes derived data from one of the user's logins.
type UserProfile struct {
ID UserID
LoginName string // "alice@smith.com"; for display purposes only (provider is not listed)
DisplayName string // "Alice Smith"
ProfilePicURL string
// Roles exists for legacy reasons, to keep old macOS clients
// happy. It JSON marshals as [].
Roles emptyStructJSONSlice
}
type emptyStructJSONSlice struct{}
var emptyJSONSliceBytes = []byte("[]")
func (emptyStructJSONSlice) MarshalJSON() ([]byte, error) {
return emptyJSONSliceBytes, nil
}
func (emptyStructJSONSlice) UnmarshalJSON([]byte) error { return nil }
type Node struct {
ID NodeID
StableID StableNodeID
Name string // DNS
// User is the user who created the node. If ACL tags are in
// use for the node then it doesn't reflect the ACL identity
// that the node is running as.
User UserID
// Sharer, if non-zero, is the user who shared this node, if different than User.
Sharer UserID `json:",omitempty"`
Key NodeKey
KeyExpiry time.Time
Machine key.MachinePublic
DiscoKey DiscoKey
Addresses []netaddr.IPPrefix // IP addresses of this Node directly
AllowedIPs []netaddr.IPPrefix // range of IP addresses to route to this node
Endpoints []string `json:",omitempty"` // IP+port (public via STUN, and local LANs)
DERP string `json:",omitempty"` // DERP-in-IP:port ("127.3.3.40:N") endpoint
Hostinfo Hostinfo
Created time.Time
// Tags are the list of ACL tags applied to this node.
// Tags take the form of `tag:<value>` where value starts
// with a letter and only contains alphanumerics and dashes `-`.
// Some valid tag examples:
// `tag:prod`
// `tag:database`
// `tag:lab-1`
Tags []string `json:",omitempty"`
// PrimaryRoutes are the routes from AllowedIPs that this node
// is currently the primary subnet router for, as determined
// by the control plane. It does not include the self address
// values from Addresses that are in AllowedIPs.
PrimaryRoutes []netaddr.IPPrefix `json:",omitempty"`
// LastSeen is when the node was last online. It is not
// updated when Online is true. It is nil if the current
// node doesn't have permission to know, or the node
// has never been online.
LastSeen *time.Time `json:",omitempty"`
// Online is whether the node is currently connected to the
// coordination server. A value of nil means unknown, or the
// current node doesn't have permission to know.
Online *bool `json:",omitempty"`
KeepAlive bool `json:",omitempty"` // open and keep open a connection to this peer
MachineAuthorized bool `json:",omitempty"` // TODO(crawshaw): replace with MachineStatus
// Capabilities are capabilities that the node has.
// They're free-form strings, but should be in the form of URLs/URIs
// such as:
// "https://tailscale.com/cap/is-admin"
// "https://tailscale.com/cap/file-sharing"
Capabilities []string `json:",omitempty"`
// The following three computed fields hold the various names that can
// be used for this node in UIs. They are populated from controlclient
// (not from control) by calling node.InitDisplayNames. These can be
// used directly or accessed via node.DisplayName or node.DisplayNames.
ComputedName string `json:",omitempty"` // MagicDNS base name (for normal non-shared-in nodes), FQDN (without trailing dot, for shared-in nodes), or Hostname (if no MagicDNS)
computedHostIfDifferent string // hostname, if different than ComputedName, otherwise empty
ComputedNameWithHost string `json:",omitempty"` // either "ComputedName" or "ComputedName (computedHostIfDifferent)", if computedHostIfDifferent is set
}
// DisplayName returns the user-facing name for a node which should
// be shown in client UIs.
//
// Parameter forOwner specifies whether the name is requested by
// the owner of the node. When forOwner is false, the hostname is
// never included in the return value.
//
// Return value is either either "Name" or "Name (Hostname)", where
// Name is the node's MagicDNS base name (for normal non-shared-in
// nodes), FQDN (without trailing dot, for shared-in nodes), or
// Hostname (if no MagicDNS). Hostname is only included in the
// return value if it varies from Name and forOwner is provided true.
//
// DisplayName is only valid if InitDisplayNames has been called.
func (n *Node) DisplayName(forOwner bool) string {
if forOwner {
return n.ComputedNameWithHost
}
return n.ComputedName
}
// DisplayName returns the decomposed user-facing name for a node.
//
// Parameter forOwner specifies whether the name is requested by
// the owner of the node. When forOwner is false, hostIfDifferent
// is always returned empty.
//
// Return value name is the node's primary name, populated with the
// node's MagicDNS base name (for normal non-shared-in nodes), FQDN
// (without trailing dot, for shared-in nodes), or Hostname (if no
// MagicDNS).
//
// Return value hostIfDifferent, when non-empty, is the node's
// hostname. hostIfDifferent is only populated when the hostname
// varies from name and forOwner is provided as true.
//
// DisplayNames is only valid if InitDisplayNames has been called.
func (n *Node) DisplayNames(forOwner bool) (name, hostIfDifferent string) {
if forOwner {
return n.ComputedName, n.computedHostIfDifferent
}
return n.ComputedName, ""
}
// InitDisplayNames computes and populates n's display name
// fields: n.ComputedName, n.computedHostIfDifferent, and
// n.ComputedNameWithHost.
func (n *Node) InitDisplayNames(networkMagicDNSSuffix string) {
name := dnsname.TrimSuffix(n.Name, networkMagicDNSSuffix)
hostIfDifferent := dnsname.SanitizeHostname(n.Hostinfo.Hostname)
if strings.EqualFold(name, hostIfDifferent) {
hostIfDifferent = ""
}
if name == "" {
if hostIfDifferent != "" {
name = hostIfDifferent
hostIfDifferent = ""
} else {
name = n.Key.String()
}
}
var nameWithHost string
if hostIfDifferent != "" {
nameWithHost = fmt.Sprintf("%s (%s)", name, hostIfDifferent)
} else {
nameWithHost = name
}
n.ComputedName = name
n.computedHostIfDifferent = hostIfDifferent
n.ComputedNameWithHost = nameWithHost
}
type MachineStatus int
const (
MachineUnknown = MachineStatus(iota)
MachineUnauthorized // server has yet to approve
MachineAuthorized // server has approved
MachineInvalid // server has explicitly rejected this machine key
)
func (m MachineStatus) MarshalText() ([]byte, error) {
return []byte(m.String()), nil
}
func (m *MachineStatus) UnmarshalText(b []byte) error {
switch string(b) {
case "machine-unknown":
*m = MachineUnknown
case "machine-unauthorized":
*m = MachineUnauthorized
case "machine-authorized":
*m = MachineAuthorized
case "machine-invalid":
*m = MachineInvalid
default:
var val int
if _, err := fmt.Sscanf(string(b), "machine-unknown(%d)", &val); err != nil {
*m = MachineStatus(val)
} else {
*m = MachineUnknown
}
}
return nil
}
func (m MachineStatus) String() string {
switch m {
case MachineUnknown:
return "machine-unknown"
case MachineUnauthorized:
return "machine-unauthorized"
case MachineAuthorized:
return "machine-authorized"
case MachineInvalid:
return "machine-invalid"
default:
return fmt.Sprintf("machine-unknown(%d)", int(m))
}
}
func isNum(b byte) bool {
return b >= '0' && b <= '9'
}
func isAlpha(b byte) bool {
return (b >= 'A' && b <= 'Z') || (b >= 'a' && b <= 'z')
}
// CheckTag validates tag for use as an ACL tag.
// For now we allow only ascii alphanumeric tags, and they need to start
// with a letter. No unicode shenanigans allowed, and we reserve punctuation
// marks other than '-' for a possible future URI scheme.
//
// Because we're ignoring unicode entirely, we can treat utf-8 as a series of
// bytes. Anything >= 128 is disqualified anyway.
//
// We might relax these rules later.
func CheckTag(tag string) error {
if !strings.HasPrefix(tag, "tag:") {
return errors.New("tags must start with 'tag:'")
}
tag = tag[4:]
if tag == "" {
return errors.New("tag names must not be empty")
}
if !isAlpha(tag[0]) {
return errors.New("tag names must start with a letter, after 'tag:'")
}
for _, b := range []byte(tag) {
if !isNum(b) && !isAlpha(b) && b != '-' {
return errors.New("tag names can only contain numbers, letters, or dashes")
}
}
return nil
}
// CheckRequestTags checks that all of h.RequestTags are valid.
func (h *Hostinfo) CheckRequestTags() error {
if h == nil {
return nil
}
for _, tag := range h.RequestTags {
if err := CheckTag(tag); err != nil {
return fmt.Errorf("tag(%#v): %w", tag, err)
}
}
return nil
}
type ServiceProto string
const (
TCP = ServiceProto("tcp")
UDP = ServiceProto("udp")
)
type Service struct {
_ structs.Incomparable
Proto ServiceProto // TCP or UDP
Port uint16 // port number service is listening on
Description string `json:",omitempty"` // text description of service
// TODO(apenwarr): allow advertising services on subnet IPs?
// TODO(apenwarr): add "tags" here for each service?
}
// Hostinfo contains a summary of a Tailscale host.
//
// Because it contains pointers (slices), this type should not be used
// as a value type.
type Hostinfo struct {
// TODO(crawshaw): mark all these fields ",omitempty" when all the
// iOS apps are updated with the latest swift version of this struct.
IPNVersion string `json:",omitempty"` // version of this code
FrontendLogID string `json:",omitempty"` // logtail ID of frontend instance
BackendLogID string `json:",omitempty"` // logtail ID of backend instance
OS string // operating system the client runs on (a version.OS value)
OSVersion string `json:",omitempty"` // operating system version, with optional distro prefix ("Debian 10.4", "Windows 10 Pro 10.0.19041")
Package string `json:",omitempty"` // Tailscale package to disambiguate ("choco", "appstore", etc; "" for unknown)
DeviceModel string `json:",omitempty"` // mobile phone model ("Pixel 3a", "iPhone12,3")
Hostname string // name of the host the client runs on
ShieldsUp bool `json:",omitempty"` // indicates whether the host is blocking incoming connections
ShareeNode bool `json:",omitempty"` // indicates this node exists in netmap because it's owned by a shared-to user
GoArch string `json:",omitempty"` // the host's GOARCH value (of the running binary)
RoutableIPs []netaddr.IPPrefix `json:",omitempty"` // set of IP ranges this client can route
RequestTags []string `json:",omitempty"` // set of ACL tags this node wants to claim
Services []Service `json:",omitempty"` // services advertised by this machine
NetInfo *NetInfo `json:",omitempty"`
// NOTE: any new fields containing pointers in this type
// require changes to Hostinfo.Equal.
}
// NetInfo contains information about the host's network state.
type NetInfo struct {
// MappingVariesByDestIP says whether the host's NAT mappings
// vary based on the destination IP.
MappingVariesByDestIP opt.Bool
// HairPinning is their router does hairpinning.
// It reports true even if there's no NAT involved.
HairPinning opt.Bool
// WorkingIPv6 is whether IPv6 works.
WorkingIPv6 opt.Bool
// WorkingUDP is whether UDP works.
WorkingUDP opt.Bool
// HavePortMap is whether we have an existing portmap open
// (UPnP, PMP, or PCP).
HavePortMap bool `json:",omitempty"`
// UPnP is whether UPnP appears present on the LAN.
// Empty means not checked.
UPnP opt.Bool
// PMP is whether NAT-PMP appears present on the LAN.
// Empty means not checked.
PMP opt.Bool
// PCP is whether PCP appears present on the LAN.
// Empty means not checked.
PCP opt.Bool
// PreferredDERP is this node's preferred DERP server
// for incoming traffic. The node might be be temporarily
// connected to multiple DERP servers (to send to other nodes)
// but PreferredDERP is the instance number that the node
// subscribes to traffic at.
// Zero means disconnected or unknown.
PreferredDERP int
// LinkType is the current link type, if known.
LinkType string `json:",omitempty"` // "wired", "wifi", "mobile" (LTE, 4G, 3G, etc)
// DERPLatency is the fastest recent time to reach various
// DERP STUN servers, in seconds. The map key is the
// "regionID-v4" or "-v6"; it was previously the DERP server's
// STUN host:port.
//
// This should only be updated rarely, or when there's a
// material change, as any change here also gets uploaded to
// the control plane.
DERPLatency map[string]float64 `json:",omitempty"`
// Update BasicallyEqual when adding fields.
}
func (ni *NetInfo) String() string {
if ni == nil {
return "NetInfo(nil)"
}
return fmt.Sprintf("NetInfo{varies=%v hairpin=%v ipv6=%v udp=%v derp=#%v portmap=%v link=%q}",
ni.MappingVariesByDestIP, ni.HairPinning, ni.WorkingIPv6,
ni.WorkingUDP, ni.PreferredDERP,
ni.portMapSummary(),
ni.LinkType)
}
func (ni *NetInfo) portMapSummary() string {
if !ni.HavePortMap && ni.UPnP == "" && ni.PMP == "" && ni.PCP == "" {
return "?"
}
var prefix string
if ni.HavePortMap {
prefix = "active-"
}
return prefix + conciseOptBool(ni.UPnP, "U") + conciseOptBool(ni.PMP, "M") + conciseOptBool(ni.PCP, "C")
}
func conciseOptBool(b opt.Bool, trueVal string) string {
if b == "" {
return "_"
}
v, ok := b.Get()
if !ok {
return "x"
}
if v {
return trueVal
}
return ""
}
// BasicallyEqual reports whether ni and ni2 are basically equal, ignoring
// changes in DERP ServerLatency & RegionLatency.
func (ni *NetInfo) BasicallyEqual(ni2 *NetInfo) bool {
if (ni == nil) != (ni2 == nil) {
return false
}
if ni == nil {
return true
}
return ni.MappingVariesByDestIP == ni2.MappingVariesByDestIP &&
ni.HairPinning == ni2.HairPinning &&
ni.WorkingIPv6 == ni2.WorkingIPv6 &&
ni.WorkingUDP == ni2.WorkingUDP &&
ni.HavePortMap == ni2.HavePortMap &&
ni.UPnP == ni2.UPnP &&
ni.PMP == ni2.PMP &&
ni.PCP == ni2.PCP &&
ni.PreferredDERP == ni2.PreferredDERP &&
ni.LinkType == ni2.LinkType
}
// Equal reports whether h and h2 are equal.
func (h *Hostinfo) Equal(h2 *Hostinfo) bool {
if h == nil && h2 == nil {
return true
}
if (h == nil) != (h2 == nil) {
return false
}
return reflect.DeepEqual(h, h2)
}
// SignatureType specifies a scheme for signing RegisterRequest messages. It
// specifies the crypto algorithms to use, the contents of what is signed, and
// any other relevant details. Historically, requests were unsigned so the zero
// value is SignatureNone.
type SignatureType int
const (
// SignatureNone indicates that there is no signature, no Timestamp is
// required (but may be specified if desired), and both DeviceCert and
// Signature should be empty.
SignatureNone = SignatureType(iota)
// SignatureUnknown represents an unknown signature scheme, which should
// be considered an error if seen.
SignatureUnknown
// SignatureV1 is computed as RSA-PSS-Sign(privateKeyForDeviceCert,
// SHA256(Timestamp || ServerIdentity || DeviceCert || ServerShortPubKey ||
// MachineShortPubKey)). The PSS salt length is equal to hash length
// (rsa.PSSSaltLengthEqualsHash). Device cert is required.
// Deprecated: uses old key serialization format.
SignatureV1
// SignatureV2 is computed as RSA-PSS-Sign(privateKeyForDeviceCert,
// SHA256(Timestamp || ServerIdentity || DeviceCert || ServerPubKey ||
// MachinePubKey)). The PSS salt length is equal to hash length
// (rsa.PSSSaltLengthEqualsHash). Device cert is required.
SignatureV2
)
func (st SignatureType) MarshalText() ([]byte, error) {
return []byte(st.String()), nil
}
func (st *SignatureType) UnmarshalText(b []byte) error {
switch string(b) {
case "signature-none":
*st = SignatureNone
case "signature-v1":
*st = SignatureV1
case "signature-v2":
*st = SignatureV2
default:
var val int
if _, err := fmt.Sscanf(string(b), "signature-unknown(%d)", &val); err != nil {
*st = SignatureType(val)
} else {
*st = SignatureUnknown
}
}
return nil
}
func (st SignatureType) String() string {
switch st {
case SignatureNone:
return "signature-none"
case SignatureUnknown:
return "signature-unknown"
case SignatureV1:
return "signature-v1"
case SignatureV2:
return "signature-v2"
default:
return fmt.Sprintf("signature-unknown(%d)", int(st))
}
}
// RegisterRequest is sent by a client to register the key for a node.
// It is encoded to JSON, encrypted with golang.org/x/crypto/nacl/box,
// using the local machine key, and sent to:
// https://login.tailscale.com/machine/<mkey hex>
type RegisterRequest struct {
_ structs.Incomparable
Version int // currently 1
NodeKey NodeKey
OldNodeKey NodeKey
Auth struct {
_ structs.Incomparable
// One of Provider/LoginName, Oauth2Token, or AuthKey is set.
Provider, LoginName string
Oauth2Token *Oauth2Token
AuthKey string
}
// Expiry optionally specifies the requested key expiry.
// The server policy may override.
// As a special case, if Expiry is in the past and NodeKey is
// the node's current key, the key is expired.
Expiry time.Time
Followup string // response waits until AuthURL is visited
Hostinfo *Hostinfo
// Ephemeral is whether the client is requesting that this
// node be considered ephemeral and be automatically deleted
// when it stops being active.
Ephemeral bool `json:",omitempty"`
// The following fields are not used for SignatureNone and are required for
// SignatureV1:
SignatureType SignatureType `json:",omitempty"`
Timestamp *time.Time `json:",omitempty"` // creation time of request to prevent replay
DeviceCert []byte `json:",omitempty"` // X.509 certificate for client device
Signature []byte `json:",omitempty"` // as described by SignatureType
}
// Clone makes a deep copy of RegisterRequest.
// The result aliases no memory with the original.
//
// TODO: extend cmd/cloner to generate this method.
func (req *RegisterRequest) Clone() *RegisterRequest {
if req == nil {
return nil
}
res := new(RegisterRequest)
*res = *req
if res.Hostinfo != nil {
res.Hostinfo = res.Hostinfo.Clone()
}
if res.Auth.Oauth2Token != nil {
tok := *res.Auth.Oauth2Token
res.Auth.Oauth2Token = &tok
}
res.DeviceCert = append(res.DeviceCert[:0:0], res.DeviceCert...)
res.Signature = append(res.Signature[:0:0], res.Signature...)
return res
}
// RegisterResponse is returned by the server in response to a RegisterRequest.
type RegisterResponse struct {
User User
Login Login
NodeKeyExpired bool // if true, the NodeKey needs to be replaced
MachineAuthorized bool // TODO(crawshaw): move to using MachineStatus
AuthURL string // if set, authorization pending
// Error indiciates that authorization failed. If this is non-empty,
// other status fields should be ignored.
Error string
}
// EndpointType distinguishes different sources of MapRequest.Endpoint values.
type EndpointType int
const (
EndpointUnknownType = EndpointType(0)
EndpointLocal = EndpointType(1)
EndpointSTUN = EndpointType(2)
EndpointPortmapped = EndpointType(3)
EndpointSTUN4LocalPort = EndpointType(4) // hard NAT: STUN'ed IPv4 address + local fixed port
)
func (et EndpointType) String() string {
switch et {
case EndpointUnknownType:
return "?"
case EndpointLocal:
return "local"
case EndpointSTUN:
return "stun"
case EndpointPortmapped:
return "portmap"
case EndpointSTUN4LocalPort:
return "stun4localport"
}
return "other"
}
// Endpoint is an endpoint IPPort and an associated type.
// It doesn't currently go over the wire as is but is instead
// broken up into two parallel slices in MapRequest, for compatibility
// reasons. But this type is used in the codebase.
type Endpoint struct {
Addr netaddr.IPPort
Type EndpointType
}
// MapRequest is sent by a client to start a long-poll network map updates.
// The request includes a copy of the client's current set of WireGuard
// endpoints and general host information.
//
// The request is encoded to JSON, encrypted with golang.org/x/crypto/nacl/box,
// using the local machine key, and sent to:
// https://login.tailscale.com/machine/<mkey hex>/map
type MapRequest struct {
// Version is incremented whenever the client code changes enough that
// we want to signal to the control server that we're capable of something
// different.
//
// For current values and history, see CurrentMapRequestVersion above.
Version int
Compress string // "zstd" or "" (no compression)
KeepAlive bool // whether server should send keep-alives back to us
NodeKey NodeKey
DiscoKey DiscoKey
IncludeIPv6 bool `json:",omitempty"` // include IPv6 endpoints in returned Node Endpoints (for Version 4 clients)
Stream bool // if true, multiple MapResponse objects are returned
Hostinfo *Hostinfo
// Endpoints are the client's magicsock UDP ip:port endpoints (IPv4 or IPv6).
Endpoints []string
// EndpointTypes are the types of the corresponding endpoints in Endpoints.
EndpointTypes []EndpointType `json:",omitempty"`
// ReadOnly is whether the client just wants to fetch the
// MapResponse, without updating their Endpoints. The
// Endpoints field will be ignored and LastSeen will not be
// updated and peers will not be notified of changes.
//
// The intended use is for clients to discover the DERP map at
// start-up before their first real endpoint update.
ReadOnly bool `json:",omitempty"`
// OmitPeers is whether the client is okay with the Peers list
// being omitted in the response. (For example, a client on
// start up using ReadOnly to get the DERP map.)
//
// If OmitPeers is true, Stream is false, and ReadOnly is false,
// then the server will let clients update their endpoints without
// breaking existing long-polling (Stream == true) connections.
OmitPeers bool `json:",omitempty"`
// DebugFlags is a list of strings specifying debugging and
// development features to enable in handling this map
// request. The values are deliberately unspecified, as they get
// added and removed all the time during development, and offer no
// compatibility promise. To roll out semantic changes, bump
// Version instead.
//
// Current DebugFlags values are:
// * "warn-ip-forwarding-off": client is trying to be a subnet
// router but their IP forwarding is broken.
// * "warn-router-unhealthy": client's Router implementation is
// having problems.
// * "v6-overlay": IPv6 development flag to have control send
// v6 node addrs
// * "minimize-netmap": have control minimize the netmap, removing
// peers that are unreachable per ACLS.
DebugFlags []string `json:",omitempty"`
}
// PortRange represents a range of UDP or TCP port numbers.
type PortRange struct {
First uint16
Last uint16
}
var PortRangeAny = PortRange{0, 65535}
// NetPortRange represents a range of ports that's allowed for one or more IPs.
type NetPortRange struct {
_ structs.Incomparable
IP string // IP, CIDR, Range, or "*" (same formats as FilterRule.SrcIPs)
Bits *int // deprecated; the old way to turn IP into a CIDR
Ports PortRange
}
// FilterRule represents one rule in a packet filter.
//
// A rule is logically a set of source CIDRs to match (described by
// SrcIPs and SrcBits), and a set of destination targets that are then
// allowed if a source IP is mathces of those CIDRs.
type FilterRule struct {
// SrcIPs are the source IPs/networks to match.
//
// It may take the following forms:
// * an IP address (IPv4 or IPv6)
// * the string "*" to match everything (both IPv4 & IPv6)
// * a CIDR (e.g. "192.168.0.0/16")
// * a range of two IPs, inclusive, separated by hyphen ("2eff::1-2eff::0800")
SrcIPs []string
// SrcBits is deprecated; it's the old way to specify a CIDR
// prior to MapRequest.Version 7. Its values correspond to the
// SrcIPs above.
//
// If an entry of SrcBits is present for the same index as a
// SrcIPs entry, it changes the SrcIP above to be a network
// with /n CIDR bits. If the slice is nil or insufficiently
// long, the default value (for an IPv4 address) for a
// position is 32, as if the SrcIPs above were a /32 mask. For
// a "*" SrcIPs value, the corresponding SrcBits value is
// ignored.
SrcBits []int `json:",omitempty"`
// DstPorts are the port ranges to allow once a source IP
// matches (is in the CIDR described by SrcIPs & SrcBits).
DstPorts []NetPortRange
// IPProto are the IP protocol numbers to match.
//
// As a special case, nil or empty means TCP, UDP, and ICMP.
//
// Numbers outside the uint8 range (below 0 or above 255) are
// reserved for Tailscale's use. Unknown ones are ignored.
//
// Depending on the IPProto values, DstPorts may or may not be
// used.
IPProto []int `json:",omitempty"`
}
var FilterAllowAll = []FilterRule{
{
SrcIPs: []string{"*"},
SrcBits: nil,
DstPorts: []NetPortRange{{
IP: "*",
Bits: nil,
Ports: PortRange{0, 65535},
}},
},
}
// DNSConfig is the DNS configuration.
type DNSConfig struct {
// Resolvers are the DNS resolvers to use, in order of preference.
Resolvers []dnstype.Resolver `json:",omitempty"`
// Routes maps DNS name suffixes to a set of DNS resolvers to
// use. It is used to implement "split DNS" and other advanced DNS
// routing overlays.
//
// Map keys are fully-qualified DNS name suffixes; they may
// optionally contain a trailing dot but no leading dot.
//
// If the value is an empty slice, that means the suffix should still
// be handled by Tailscale's built-in resolver (100.100.100.100), such
// as for the purpose of handling ExtraRecords.
Routes map[string][]dnstype.Resolver `json:",omitempty"`
// FallbackResolvers is like Resolvers, but is only used if a
// split DNS configuration is requested in a configuration that
// doesn't work yet without explicit default resolvers.
// https://github.com/tailscale/tailscale/issues/1743
FallbackResolvers []dnstype.Resolver `json:",omitempty"`
// Domains are the search domains to use.
// Search domains must be FQDNs, but *without* the trailing dot.
Domains []string `json:",omitempty"`
// Proxied turns on automatic resolution of hostnames for devices
// in the network map, aka MagicDNS.
// Despite the (legacy) name, does not necessarily cause request
// proxying to be enabled.
Proxied bool `json:",omitempty"`
// The following fields are only set and used by
// MapRequest.Version >=9 and <14.
// Nameservers are the IP addresses of the nameservers to use.
Nameservers []netaddr.IP `json:",omitempty"`
// PerDomain is not set by the control server, and does nothing.
PerDomain bool `json:",omitempty"`
// CertDomains are the set of DNS names for which the control
// plane server will assist with provisioning TLS
// certificates. See SetDNSRequest, which can be used to
// answer dns-01 ACME challenges for e.g. LetsEncrypt.
// These names are FQDNs without trailing periods, and without
// any "_acme-challenge." prefix.
CertDomains []string `json:",omitempty"`
// ExtraRecords contains extra DNS records to add to the
// MagicDNS config.
ExtraRecords []DNSRecord `json:",omitempty"`
}
// DNSRecord is an extra DNS record to add to MagicDNS.
type DNSRecord struct {
// Name is the fully qualified domain name of
// the record to add. The trailing dot is optional.
Name string
// Type is the DNS record type.
// Empty means A or AAAA, depending on value.
// Other values are currently ignored.
Type string `json:",omitempty"`
// Value is the IP address in string form.
// TODO(bradfitz): if we ever add support for record types
// with non-UTF8 binary data, add ValueBytes []byte that
// would take precedence.
Value string
}
// PingRequest with no IP and Types is a request to send an HTTP request to prove the
// long-polling client is still connected.
// PingRequest with Types and IP, will send a ping to the IP and send a
// POST request to the URL to prove that the ping succeeded.
type PingRequest struct {
// URL is the URL to send a HEAD request to.
// It will be a unique URL each time. No auth headers are necessary.
//
// If the client sees multiple PingRequests with the same URL,
// subsequent ones should be ignored.
// If Types and IP are defined, then URL is the URL to send a POST request to.
URL string
// Log is whether to log about this ping in the success case.
// For failure cases, the client will log regardless.
Log bool `json:",omitempty"`
// Types is the types of ping that is initiated. Can be TSMP, ICMP or disco.
// Types will be comma separated, such as TSMP,disco.
Types string
// IP is the ping target.
// It is used in TSMP pings, if IP is invalid or empty then do a HEAD request to the URL.
IP netaddr.IP
}
type MapResponse struct {
// KeepAlive, if set, represents an empty message just to keep
// the connection alive. When true, all other fields except
// PingRequestURL are ignored.
KeepAlive bool `json:",omitempty"`
// PingRequest, if non-empty, is a request to the client to
// prove it's still there by sending an HTTP request to the
// provided URL. No auth headers are necessary.
// PingRequest may be sent on any MapResponse (ones with
// KeepAlive true or false).
PingRequest *PingRequest `json:",omitempty"`
// Networking
// Node describes the node making the map request.
// Starting with MapRequest.Version 18, nil means unchanged.
Node *Node `json:",omitempty"`
// DERPMap describe the set of DERP servers available.
// A nil value means unchanged.
DERPMap *DERPMap `json:",omitempty"`
// Peers, if non-empty, is the complete list of peers.
// It will be set in the first MapResponse for a long-polled request/response.
// Subsequent responses will be delta-encoded if MapRequest.Version >= 5 and server
// chooses, in which case Peers will be nil or zero length.
// If Peers is non-empty, PeersChanged and PeersRemoved should
// be ignored (and should be empty).
// Peers is always returned sorted by Node.ID.
Peers []*Node `json:",omitempty"`
// PeersChanged are the Nodes (identified by their ID) that
// have changed or been added since the past update on the
// HTTP response. It's not used by the server if MapRequest.Version < 5.
// PeersChanged is always returned sorted by Node.ID.
PeersChanged []*Node `json:",omitempty"`
// PeersRemoved are the NodeIDs that are no longer in the peer list.
PeersRemoved []NodeID `json:",omitempty"`
// PeerSeenChange contains information on how to update peers' LastSeen
// times. If the value is false, the peer is gone. If the value is true,
// the LastSeen time is now. Absent means unchanged.
PeerSeenChange map[NodeID]bool `json:",omitempty"`
// OnlineChange changes the value of a Peer Node.Online value.
OnlineChange map[NodeID]bool `json:",omitempty"`
// DNS is the same as DNSConfig.Nameservers.
// Only populated if MapRequest.Version < 9.
DNS []netaddr.IP `json:",omitempty"`
// SearchPaths is the old way to specify DNS search domains.
// Only populated if MapRequest.Version < 9.
SearchPaths []string `json:",omitempty"`
// DNSConfig contains the DNS settings for the client to use.
// A nil value means no change from an earlier non-nil value.
DNSConfig *DNSConfig `json:",omitempty"`
// Domain is the name of the network that this node is
// in. It's either of the form "example.com" (for user
// foo@example.com, for multi-user networks) or
// "foo@gmail.com" (for siloed users on shared email
// providers). Its exact form should not be depended on; new
// forms are coming later.
// If empty, the value is unchanged.
Domain string `json:",omitempty"`
// CollectServices reports whether this node's Tailnet has
// requested that info about services be included in HostInfo.
// If unset, the most recent non-empty MapResponse value in
// the HTTP response stream is used.
CollectServices opt.Bool `json:",omitempty"`
// PacketFilter are the firewall rules.
//
// For MapRequest.Version >= 6, a nil value means the most
// previously streamed non-nil MapResponse.PacketFilter within
// the same HTTP response. A non-nil but empty list always means
// no PacketFilter (that is, to block everything).
PacketFilter []FilterRule `json:",omitempty"`
// UserProfiles are the user profiles of nodes in the network.
// As as of 1.1.541 (mapver 5), this contains new or updated
// user profiles only.
UserProfiles []UserProfile `json:",omitempty"`
// Health, if non-nil, sets the health state
// of the node from the control plane's perspective.
// A nil value means no change from the previous MapResponse.
// A non-nil 0-length slice restores the health to good (no known problems).
// A non-zero length slice are the list of problems that the control place
// sees.
Health []string `json:",omitempty"`
// Debug is normally nil, except for when the control server
// is setting debug settings on a node.
Debug *Debug `json:",omitempty"`
}
// Debug are instructions from the control server to the client
// to adjust debug settings.
type Debug struct {
// LogHeapPprof controls whether the client should log
// its heap pprof data. Each true value sent from the server
// means that client should do one more log.
LogHeapPprof bool `json:",omitempty"`
// LogHeapURL is the URL to POST its heap pprof to.
// Empty means to not log.
LogHeapURL string `json:",omitempty"`
// ForceBackgroundSTUN controls whether magicsock should
// always do its background STUN queries (see magicsock's
// periodicReSTUN), regardless of inactivity.
ForceBackgroundSTUN bool `json:",omitempty"`
// DERPRoute controls whether the DERP reverse path
// optimization (see Issue 150) should be enabled or
// disabled. The environment variable in magicsock is the
// highest priority (if set), then this (if set), then the
// binary default value.
DERPRoute opt.Bool `json:",omitempty"`
// TrimWGConfig controls whether Tailscale does lazy, on-demand
// wireguard configuration of peers.
TrimWGConfig opt.Bool `json:",omitempty"`
// DisableSubnetsIfPAC controls whether subnet routers should be
// disabled if WPAD is present on the network.
DisableSubnetsIfPAC opt.Bool `json:",omitempty"`
// GoroutineDumpURL, if non-empty, requests that the client do
// a one-time dump of its active goroutines to the given URL.
GoroutineDumpURL string `json:",omitempty"`
// SleepSeconds requests that the client sleep for the
// provided number of seconds.
// The client can (and should) limit the value (such as 5
// minutes).
SleepSeconds float64 `json:",omitempty"`
// RandomizeClientPort is whether magicsock should UDP bind to
// :0 to get a random local port, ignoring any configured
// fixed port.
RandomizeClientPort bool `json:",omitempty"`
/// DisableUPnP is whether the client will attempt to perform a UPnP portmapping.
// By default, we want to enable it to see if it works on more clients.
//
// If UPnP catastrophically fails for people, this should be set to True to kill
// new attempts at UPnP connections.
DisableUPnP opt.Bool `json:",omitempty"`
}
func appendKey(base []byte, prefix string, k [32]byte) []byte {
ret := append(base, make([]byte, len(prefix)+64)...)
buf := ret[len(base):]
copy(buf, prefix)
hex.Encode(buf[len(prefix):], k[:])
return ret
}
func keyMarshalText(prefix string, k [32]byte) []byte {
return appendKey(nil, prefix, k)
}
func (k DiscoKey) String() string { return fmt.Sprintf("discokey:%x", k[:]) }
func (k DiscoKey) MarshalText() ([]byte, error) {
dk := key.DiscoPublicFromRaw32(mem.B(k[:]))
return dk.MarshalText()
}
func (k *DiscoKey) UnmarshalText(text []byte) error {
var dk key.DiscoPublic
if err := dk.UnmarshalText(text); err != nil {
return err
}
dk.AppendTo(k[:0])
return nil
}
func (k DiscoKey) ShortString() string { return fmt.Sprintf("d:%x", k[:8]) }
func (k DiscoKey) AppendTo(b []byte) []byte { return appendKey(b, "discokey:", k) }
// IsZero reports whether k is the zero value.
func (k DiscoKey) IsZero() bool { return k == DiscoKey{} }
func (id ID) String() string { return fmt.Sprintf("id:%x", int64(id)) }
func (id UserID) String() string { return fmt.Sprintf("userid:%x", int64(id)) }
func (id LoginID) String() string { return fmt.Sprintf("loginid:%x", int64(id)) }
func (id NodeID) String() string { return fmt.Sprintf("nodeid:%x", int64(id)) }
// Equal reports whether n and n2 are equal.
func (n *Node) Equal(n2 *Node) bool {
if n == nil && n2 == nil {
return true
}
return n != nil && n2 != nil &&
n.ID == n2.ID &&
n.StableID == n2.StableID &&
n.Name == n2.Name &&
n.User == n2.User &&
n.Sharer == n2.Sharer &&
n.Key == n2.Key &&
n.KeyExpiry.Equal(n2.KeyExpiry) &&
n.Machine == n2.Machine &&
n.DiscoKey == n2.DiscoKey &&
eqBoolPtr(n.Online, n2.Online) &&
eqCIDRs(n.Addresses, n2.Addresses) &&
eqCIDRs(n.AllowedIPs, n2.AllowedIPs) &&
eqCIDRs(n.PrimaryRoutes, n2.PrimaryRoutes) &&
eqStrings(n.Endpoints, n2.Endpoints) &&
n.DERP == n2.DERP &&
n.Hostinfo.Equal(&n2.Hostinfo) &&
n.Created.Equal(n2.Created) &&
eqTimePtr(n.LastSeen, n2.LastSeen) &&
n.MachineAuthorized == n2.MachineAuthorized &&
eqStrings(n.Capabilities, n2.Capabilities) &&
n.ComputedName == n2.ComputedName &&
n.computedHostIfDifferent == n2.computedHostIfDifferent &&
n.ComputedNameWithHost == n2.ComputedNameWithHost &&
eqStrings(n.Tags, n2.Tags)
}
func eqBoolPtr(a, b *bool) bool {
if a == b { // covers nil
return true
}
if a == nil || b == nil {
return false
}
return *a == *b
}
func eqStrings(a, b []string) bool {
if len(a) != len(b) || ((a == nil) != (b == nil)) {
return false
}
for i, v := range a {
if v != b[i] {
return false
}
}
return true
}
func eqCIDRs(a, b []netaddr.IPPrefix) bool {
if len(a) != len(b) || ((a == nil) != (b == nil)) {
return false
}
for i, v := range a {
if v != b[i] {
return false
}
}
return true
}
func eqTimePtr(a, b *time.Time) bool {
return ((a == nil) == (b == nil)) && (a == nil || a.Equal(*b))
}
// Oauth2Token is a copy of golang.org/x/oauth2.Token, to avoid the
// go.mod dependency on App Engine and grpc, which was causing problems.
// All we actually needed was this struct on the client side.
type Oauth2Token struct {
// AccessToken is the token that authorizes and authenticates
// the requests.
AccessToken string `json:"access_token"`
// TokenType is the type of token.
// The Type method returns either this or "Bearer", the default.
TokenType string `json:"token_type,omitempty"`
// RefreshToken is a token that's used by the application
// (as opposed to the user) to refresh the access token
// if it expires.
RefreshToken string `json:"refresh_token,omitempty"`
// Expiry is the optional expiration time of the access token.
//
// If zero, TokenSource implementations will reuse the same
// token forever and RefreshToken or equivalent
// mechanisms for that TokenSource will not be used.
Expiry time.Time `json:"expiry,omitempty"`
}
const (
CapabilityFileSharing = "https://tailscale.com/cap/file-sharing"
CapabilityAdmin = "https://tailscale.com/cap/is-admin"
)
// SetDNSRequest is a request to add a DNS record.
//
// This is used for ACME DNS-01 challenges (so people can use
// LetsEncrypt, etc).
//
// The request is encoded to JSON, encrypted with golang.org/x/crypto/nacl/box,
// using the local machine key, and sent to:
// https://login.tailscale.com/machine/<mkey hex>/set-dns
type SetDNSRequest struct {
// Version indicates what level of SetDNSRequest functionality
// the client understands. Currently this type only has
// one version; this field should always be 1 for now.
Version int
// NodeKey is the client's current node key.
NodeKey NodeKey
// Name is the domain name for which to create a record.
// For ACME DNS-01 challenges, it should be one of the domains
// in MapResponse.DNSConfig.CertDomains with the prefix
// "_acme-challenge.".
Name string
// Type is the DNS record type. For ACME DNS-01 challenges, it
// should be "TXT".
Type string
// Value is the value to add.
Value string
}