forked from slackhq/nebula
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
356 lines (307 loc) · 10.8 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
package nebula
import (
"encoding/binary"
"fmt"
"net"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"time"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula/sshd"
"gopkg.in/yaml.v2"
)
var l = logrus.New()
type m map[string]interface{}
func Main(configPath string, configTest bool, buildVersion string) {
l.Out = os.Stdout
l.Formatter = &logrus.TextFormatter{
FullTimestamp: true,
}
config := NewConfig()
err := config.Load(configPath)
if err != nil {
l.WithError(err).Error("Failed to load config")
os.Exit(1)
}
// Print the config if in test, the exit comes later
if configTest {
b, err := yaml.Marshal(config.Settings)
if err != nil {
l.Println(err)
os.Exit(1)
}
l.Println(string(b))
}
err = configLogger(config)
if err != nil {
l.WithError(err).Error("Failed to configure the logger")
}
config.RegisterReloadCallback(func(c *Config) {
err := configLogger(c)
if err != nil {
l.WithError(err).Error("Failed to configure the logger")
}
})
// trustedCAs is currently a global, so loadCA operates on that global directly
trustedCAs, err = loadCAFromConfig(config)
if err != nil {
//The errors coming out of loadCA are already nicely formatted
l.WithError(err).Fatal("Failed to load ca from config")
}
l.WithField("fingerprints", trustedCAs.GetFingerprints()).Debug("Trusted CA fingerprints")
cs, err := NewCertStateFromConfig(config)
if err != nil {
//The errors coming out of NewCertStateFromConfig are already nicely formatted
l.WithError(err).Fatal("Failed to load certificate from config")
}
l.WithField("cert", cs.certificate).Debug("Client nebula certificate")
fw, err := NewFirewallFromConfig(cs.certificate, config)
if err != nil {
l.WithError(err).Fatal("Error while loading firewall rules")
}
l.WithField("firewallHash", fw.GetRuleHash()).Info("Firewall started")
// TODO: make sure mask is 4 bytes
tunCidr := cs.certificate.Details.Ips[0]
routes, err := parseRoutes(config, tunCidr)
if err != nil {
l.WithError(err).Fatal("Could not parse tun.routes")
}
unsafeRoutes, err := parseUnsafeRoutes(config, tunCidr)
if err != nil {
l.WithError(err).Fatal("Could not parse tun.unsafe_routes")
}
ssh, err := sshd.NewSSHServer(l.WithField("subsystem", "sshd"))
wireSSHReload(ssh, config)
if config.GetBool("sshd.enabled", false) {
err = configSSH(ssh, config)
if err != nil {
l.WithError(err).Fatal("Error while configuring the sshd")
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// All non system modifying configuration consumption should live above this line
// tun config, listeners, anything modifying the computer should be below
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
if configTest {
os.Exit(0)
}
config.CatchHUP()
// set up our tun dev
tun, err := newTun(
config.GetString("tun.dev", ""),
tunCidr,
config.GetInt("tun.mtu", DEFAULT_MTU),
routes,
unsafeRoutes,
config.GetInt("tun.tx_queue", 500),
)
if err != nil {
l.WithError(err).Fatal("Failed to get a tun/tap device")
}
// set up our UDP listener
udpQueues := config.GetInt("listen.routines", 1)
udpServer, err := NewListener(config.GetString("listen.host", "0.0.0.0"), config.GetInt("listen.port", 0), udpQueues > 1)
if err != nil {
l.WithError(err).Fatal("Failed to open udp listener")
}
udpServer.reloadConfig(config)
// Set up my internal host map
var preferredRanges []*net.IPNet
rawPreferredRanges := config.GetStringSlice("preferred_ranges", []string{})
// First, check if 'preferred_ranges' is set and fallback to 'local_range'
if len(rawPreferredRanges) > 0 {
for _, rawPreferredRange := range rawPreferredRanges {
_, preferredRange, err := net.ParseCIDR(rawPreferredRange)
if err != nil {
l.WithError(err).Fatal("Failed to parse preferred ranges")
}
preferredRanges = append(preferredRanges, preferredRange)
}
}
// local_range was superseded by preferred_ranges. If it is still present,
// merge the local_range setting into preferred_ranges. We will probably
// deprecate local_range and remove in the future.
rawLocalRange := config.GetString("local_range", "")
if rawLocalRange != "" {
_, localRange, err := net.ParseCIDR(rawLocalRange)
if err != nil {
l.WithError(err).Fatal("Failed to parse local range")
}
// Check if the entry for local_range was already specified in
// preferred_ranges. Don't put it into the slice twice if so.
var found bool
for _, r := range preferredRanges {
if r.String() == localRange.String() {
found = true
break
}
}
if !found {
preferredRanges = append(preferredRanges, localRange)
}
}
hostMap := NewHostMap("main", tunCidr, preferredRanges)
hostMap.SetDefaultRoute(ip2int(net.ParseIP(config.GetString("default_route", "0.0.0.0"))))
hostMap.addUnsafeRoutes(&unsafeRoutes)
l.WithField("network", hostMap.vpnCIDR).WithField("preferredRanges", hostMap.preferredRanges).Info("Main HostMap created")
/*
config.SetDefault("promoter.interval", 10)
go hostMap.Promoter(config.GetInt("promoter.interval"))
*/
punchy := config.GetBool("punchy", false)
if punchy == true {
l.Info("UDP hole punching enabled")
go hostMap.Punchy(udpServer)
}
port := config.GetInt("listen.port", 0)
// If port is dynamic, discover it
if port == 0 {
uPort, err := udpServer.LocalAddr()
if err != nil {
l.WithError(err).Fatal("Failed to get listening port")
}
port = int(uPort.Port)
}
punchBack := config.GetBool("punch_back", false)
amLighthouse := config.GetBool("lighthouse.am_lighthouse", false)
// warn if am_lighthouse is enabled but upstream lighthouses exists
rawLighthouseHosts := config.GetStringSlice("lighthouse.hosts", []string{})
if amLighthouse && len(rawLighthouseHosts) != 0 {
l.Warn("lighthouse.am_lighthouse enabled on node but upstream lighthouses exist in config")
}
lighthouseHosts := make([]uint32, len(rawLighthouseHosts))
for i, host := range rawLighthouseHosts {
ip := net.ParseIP(host)
if ip == nil {
l.WithField("host", host).Fatalf("Unable to parse lighthouse host entry %v", i+1)
}
if !tunCidr.Contains(ip) {
l.WithField("vpnIp", ip).WithField("network", tunCidr.String()).Fatalf("lighthouse host is not in our subnet, invalid")
}
lighthouseHosts[i] = ip2int(ip)
}
lightHouse := NewLightHouse(
amLighthouse,
ip2int(tunCidr.IP),
lighthouseHosts,
//TODO: change to a duration
config.GetInt("lighthouse.interval", 10),
port,
udpServer,
punchBack,
)
//TODO: Move all of this inside functions in lighthouse.go
for k, v := range config.GetMap("static_host_map", map[interface{}]interface{}{}) {
vpnIp := net.ParseIP(fmt.Sprintf("%v", k))
if !tunCidr.Contains(vpnIp) {
l.WithField("vpnIp", vpnIp).WithField("network", tunCidr.String()).Fatalf("static_host_map key is not in our subnet, invalid")
}
vals, ok := v.([]interface{})
if ok {
for _, v := range vals {
parts := strings.Split(fmt.Sprintf("%v", v), ":")
addr, err := net.ResolveIPAddr("ip", parts[0])
if err == nil {
ip := addr.IP
port, err := strconv.Atoi(parts[1])
if err != nil {
l.Fatalf("Static host address for %s could not be parsed: %s", vpnIp, v)
}
lightHouse.AddRemote(ip2int(vpnIp), NewUDPAddr(ip2int(ip), uint16(port)), true)
}
}
} else {
//TODO: make this all a helper
parts := strings.Split(fmt.Sprintf("%v", v), ":")
addr, err := net.ResolveIPAddr("ip", parts[0])
if err == nil {
ip := addr.IP
port, err := strconv.Atoi(parts[1])
if err != nil {
l.Fatalf("Static host address for %s could not be parsed: %s", vpnIp, v)
}
lightHouse.AddRemote(ip2int(vpnIp), NewUDPAddr(ip2int(ip), uint16(port)), true)
}
}
}
err = lightHouse.ValidateLHStaticEntries()
if err != nil {
l.WithError(err).Error("Lighthouse unreachable")
}
handshakeManager := NewHandshakeManager(tunCidr, preferredRanges, hostMap, lightHouse, udpServer)
//TODO: These will be reused for psk
//handshakeMACKey := config.GetString("handshake_mac.key", "")
//handshakeAcceptedMACKeys := config.GetStringSlice("handshake_mac.accepted_keys", []string{})
serveDns := config.GetBool("lighthouse.serve_dns", false)
checkInterval := config.GetInt("timers.connection_alive_interval", 5)
pendingDeletionInterval := config.GetInt("timers.pending_deletion_interval", 10)
ifConfig := &InterfaceConfig{
HostMap: hostMap,
Inside: tun,
Outside: udpServer,
certState: cs,
Cipher: config.GetString("cipher", "aes"),
Firewall: fw,
ServeDns: serveDns,
HandshakeManager: handshakeManager,
lightHouse: lightHouse,
checkInterval: checkInterval,
pendingDeletionInterval: pendingDeletionInterval,
DropLocalBroadcast: config.GetBool("tun.drop_local_broadcast", false),
DropMulticast: config.GetBool("tun.drop_multicast", false),
UDPBatchSize: config.GetInt("listen.batch", 64),
}
switch ifConfig.Cipher {
case "aes":
noiseEndiannes = binary.BigEndian
case "chachapoly":
noiseEndiannes = binary.LittleEndian
default:
l.Fatalf("Unknown cipher: %v", ifConfig.Cipher)
}
ifce, err := NewInterface(ifConfig)
if err != nil {
l.WithError(err).Fatal("Failed to initialize interface")
}
ifce.RegisterConfigChangeCallbacks(config)
go handshakeManager.Run(ifce)
go lightHouse.LhUpdateWorker(ifce)
err = startStats(config)
if err != nil {
l.WithError(err).Fatal("Failed to start stats emitter")
}
//TODO: check if we _should_ be emitting stats
go ifce.emitStats(config.GetDuration("stats.interval", time.Second*10))
attachCommands(ssh, hostMap, handshakeManager.pendingHostMap, lightHouse, ifce)
ifce.Run(config.GetInt("tun.routines", 1), udpQueues, buildVersion)
// Start DNS server last to allow using the nebula IP as lighthouse.dns.host
if amLighthouse && serveDns {
l.Debugln("Starting dns server")
go dnsMain(hostMap, config)
}
// Just sit here and be friendly, main thread.
shutdownBlock(ifce)
}
func shutdownBlock(ifce *Interface) {
var sigChan = make(chan os.Signal)
signal.Notify(sigChan, syscall.SIGTERM)
signal.Notify(sigChan, syscall.SIGINT)
sig := <-sigChan
l.WithField("signal", sig).Info("Caught signal, shutting down")
//TODO: stop tun and udp routines, the lock on hostMap does effectively does that though
//TODO: this is probably better as a function in ConnectionManager or HostMap directly
ifce.hostMap.Lock()
for _, h := range ifce.hostMap.Hosts {
if h.ConnectionState.ready {
ifce.send(closeTunnel, 0, h.ConnectionState, h, h.remote, []byte{}, make([]byte, 12, 12), make([]byte, mtu))
l.WithField("vpnIp", IntIp(h.hostId)).WithField("udpAddr", h.remote).
Debug("Sending close tunnel message")
}
}
ifce.hostMap.Unlock()
l.WithField("signal", sig).Info("Goodbye")
os.Exit(0)
}