// 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" "reflect" "strings" "time" "github.com/tailscale/wireguard-go/wgcfg" "tailscale.com/tailcfg" "tailscale.com/types/logger" "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 // DERPMap is the last DERP server map received. It's reused // between updates and should not be modified. DERPMap *tailcfg.DERPMap // Debug knobs from control server for debug or feature gating. Debug *tailcfg.Debug // 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", nm.NodeKey.ShortString(), nm.MachineStatus) if nm.LocalPort != 0 { fmt.Fprintf(buf, " port=%v", nm.LocalPort) } if nm.Debug != nil { j, _ := json.Marshal(nm.Debug) fmt.Fprintf(buf, " debug=%s", j) } fmt.Fprintf(buf, " %v", nm.Addresses) buf.WriteByte('\n') for _, p := range nm.Peers { aip := make([]string, len(p.AllowedIPs)) for i, a := range p.AllowedIPs { s := strings.TrimSuffix(fmt.Sprint(a), "/32") 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, ':') spaces := 0 for colon > 0 && len(e)+spaces-colon < 6 { spaces++ colon-- } ep[i] = fmt.Sprintf("%21v", e+strings.Repeat(" ", spaces)) } 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 { if reflect.DeepEqual(a, b) { // Fast path that only does one allocation. return "" } 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(log.Printf, 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(logf logger.Logf, uflags int, dnsOverride []wgcfg.IP) (*wgcfg.Config, error) { s := nm._WireGuardConfig(logf, uflags, dnsOverride, true) return wgcfg.FromWgQuick(s, "tailscale") } func (nm *NetworkMap) _WireGuardConfig(logf logger.Logf, 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 { logf("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 { logf("wgcfg: %v skipping default route\n", peer.Key.ShortString()) continue } if (uflags & UHackDefaultRoute) != 0 { aip = "10.0.0.0/8" logf("wgcfg: %v converting default route => %v\n", peer.Key.ShortString(), aip) } } else if allowedIP.Mask < 32 { if (uflags & UAllowSubnetRoutes) == 0 { logf("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() }