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tailscale/control/controlclient/netmap.go

279 lines
7.1 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 controlclient
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"log"
"strings"
"time"
"github.com/tailscale/wireguard-go/wgcfg"
"tailscale.com/tailcfg"
"tailscale.com/wgengine/filter"
)
type NetworkMap struct {
// Core networking
NodeKey tailcfg.NodeKey
PrivateKey wgcfg.PrivateKey
Expiry time.Time
Addresses []wgcfg.CIDR
LocalPort uint16 // used for debugging
MachineStatus tailcfg.MachineStatus
Peers []*tailcfg.Node
DNS []wgcfg.IP
DNSDomains []string
Hostinfo tailcfg.Hostinfo
PacketFilter filter.Matches
// ACLs
User tailcfg.UserID
Domain string
// TODO(crawshaw): reduce UserProfiles to []tailcfg.UserProfile?
// There are lots of ways to slice this data, leave it up to users.
UserProfiles map[tailcfg.UserID]tailcfg.UserProfile
Roles []tailcfg.Role
// TODO(crawshaw): Groups []tailcfg.Group
// TODO(crawshaw): Capabilities []tailcfg.Capability
}
func (n *NetworkMap) Equal(n2 *NetworkMap) bool {
// TODO(crawshaw): this is crude, but is an easy way to avoid bugs.
b, err := json.Marshal(n)
if err != nil {
panic(err)
}
b2, err := json.Marshal(n2)
if err != nil {
panic(err)
}
return bytes.Equal(b, b2)
}
func (nm NetworkMap) String() string {
return nm.Concise()
}
func (nm *NetworkMap) Concise() string {
buf := new(strings.Builder)
fmt.Fprintf(buf, "netmap: self: %v auth=%v :%v %v\n",
nm.NodeKey.ShortString(), nm.MachineStatus,
nm.LocalPort, nm.Addresses)
for _, p := range nm.Peers {
aip := make([]string, len(p.AllowedIPs))
for i, a := range p.AllowedIPs {
s := fmt.Sprint(a)
if strings.HasSuffix(s, "/32") {
s = s[0 : len(s)-3]
}
aip[i] = s
}
ep := make([]string, len(p.Endpoints))
for i, e := range p.Endpoints {
// Align vertically on the ':' between IP and port
colon := strings.IndexByte(e, ':')
for colon > 0 && len(e)-colon < 6 {
e += " "
colon--
}
ep[i] = fmt.Sprintf("%21v", e)
}
derp := p.DERP
const derpPrefix = "127.3.3.40:"
if strings.HasPrefix(derp, derpPrefix) {
derp = "D" + derp[len(derpPrefix):]
}
// Most of the time, aip is just one element, so format the
// table to look good in that case. This will also make multi-
// subnet nodes stand out visually.
fmt.Fprintf(buf, " %v %-2v %-15v : %v\n",
p.Key.ShortString(), derp,
strings.Join(aip, " "),
strings.Join(ep, " "))
}
return buf.String()
}
func (b *NetworkMap) ConciseDiffFrom(a *NetworkMap) string {
out := []string{}
ra := strings.Split(a.Concise(), "\n")
rb := strings.Split(b.Concise(), "\n")
ma := map[string]struct{}{}
for _, s := range ra {
ma[s] = struct{}{}
}
mb := map[string]struct{}{}
for _, s := range rb {
mb[s] = struct{}{}
}
for _, s := range ra {
if _, ok := mb[s]; !ok {
out = append(out, "-"+s)
}
}
for _, s := range rb {
if _, ok := ma[s]; !ok {
out = append(out, "+"+s)
}
}
return strings.Join(out, "\n")
}
func (nm *NetworkMap) JSON() string {
b, err := json.MarshalIndent(*nm, "", " ")
if err != nil {
return fmt.Sprintf("[json error: %v]", err)
}
return string(b)
}
const (
UAllowSingleHosts = 1 << iota
UAllowSubnetRoutes
UAllowDefaultRoute
UHackDefaultRoute
UDefault = 0
)
// Several programs need to parse these arguments into uflags, so let's
// centralize it here.
func UFlagsHelper(uroutes, rroutes, droutes bool) int {
uflags := 0
if uroutes {
uflags |= UAllowSingleHosts
}
if rroutes {
uflags |= UAllowSubnetRoutes
}
if droutes {
uflags |= UAllowDefaultRoute
}
return uflags
}
// TODO(bradfitz): UAPI seems to only be used by the old confnode and
// pingnode; delete this when those are deleted/rewritten?
func (nm *NetworkMap) UAPI(uflags int, dnsOverride []wgcfg.IP) string {
wgcfg, err := nm.WGCfg(uflags, dnsOverride)
if err != nil {
log.Fatalf("WGCfg() failed unexpectedly: %v\n", err)
}
s, err := wgcfg.ToUAPI()
if err != nil {
log.Fatalf("ToUAPI() failed unexpectedly: %v\n", err)
}
return s
}
func (nm *NetworkMap) WGCfg(uflags int, dnsOverride []wgcfg.IP) (*wgcfg.Config, error) {
s := nm._WireGuardConfig(uflags, dnsOverride, true)
return wgcfg.FromWgQuick(s, "tailscale")
}
// TODO(apenwarr): This mode is dangerous.
// Discarding the extra endpoints is almost universally the wrong choice.
// Except that plain wireguard can't handle a peer with multiple endpoints.
// (Yet?)
func (nm *NetworkMap) WireGuardConfigOneEndpoint(uflags int, dnsOverride []wgcfg.IP) string {
return nm._WireGuardConfig(uflags, dnsOverride, false)
}
func (nm *NetworkMap) _WireGuardConfig(uflags int, dnsOverride []wgcfg.IP, allEndpoints bool) string {
buf := new(strings.Builder)
fmt.Fprintf(buf, "[Interface]\n")
fmt.Fprintf(buf, "PrivateKey = %s\n", base64.StdEncoding.EncodeToString(nm.PrivateKey[:]))
if len(nm.Addresses) > 0 {
fmt.Fprintf(buf, "Address = ")
for i, cidr := range nm.Addresses {
if i > 0 {
fmt.Fprintf(buf, ", ")
}
fmt.Fprintf(buf, "%s", cidr)
}
fmt.Fprintf(buf, "\n")
}
fmt.Fprintf(buf, "ListenPort = %d\n", nm.LocalPort)
if len(dnsOverride) > 0 {
dnss := []string{}
for _, ip := range dnsOverride {
dnss = append(dnss, ip.String())
}
fmt.Fprintf(buf, "DNS = %s\n", strings.Join(dnss, ","))
}
fmt.Fprintf(buf, "\n")
for i, peer := range nm.Peers {
if (uflags&UAllowSingleHosts) == 0 && len(peer.AllowedIPs) < 2 {
log.Printf("wgcfg: %v skipping a single-host peer.\n", peer.Key.ShortString())
continue
}
if i > 0 {
fmt.Fprintf(buf, "\n")
}
fmt.Fprintf(buf, "[Peer]\n")
fmt.Fprintf(buf, "PublicKey = %s\n", base64.StdEncoding.EncodeToString(peer.Key[:]))
var endpoints []string
if peer.DERP != "" {
endpoints = append(endpoints, peer.DERP)
}
endpoints = append(endpoints, peer.Endpoints...)
if len(endpoints) > 0 {
if len(endpoints) == 1 {
fmt.Fprintf(buf, "Endpoint = %s", endpoints[0])
} else if allEndpoints {
// TODO(apenwarr): This mode is incompatible.
// Normal wireguard clients don't know how to
// parse it (yet?)
fmt.Fprintf(buf, "Endpoint = %s",
strings.Join(endpoints, ","))
} else {
fmt.Fprintf(buf, "Endpoint = %s # other endpoints: %s",
endpoints[0],
strings.Join(endpoints[1:], ", "))
}
buf.WriteByte('\n')
}
var aips []string
for _, allowedIP := range peer.AllowedIPs {
aip := allowedIP.String()
if allowedIP.Mask == 0 {
if (uflags & UAllowDefaultRoute) == 0 {
log.Printf("wgcfg: %v skipping default route\n", peer.Key.ShortString())
continue
}
if (uflags & UHackDefaultRoute) != 0 {
aip = "10.0.0.0/8"
log.Printf("wgcfg: %v converting default route => %v\n", peer.Key.ShortString(), aip)
}
} else if allowedIP.Mask < 32 {
if (uflags & UAllowSubnetRoutes) == 0 {
log.Printf("wgcfg: %v skipping subnet route\n", peer.Key.ShortString())
continue
}
}
aips = append(aips, aip)
}
fmt.Fprintf(buf, "AllowedIPs = %s\n", strings.Join(aips, ", "))
if peer.KeepAlive {
fmt.Fprintf(buf, "PersistentKeepalive = 25\n")
}
}
return buf.String()
}