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Commit7d9f5ab

Browse files
authored
chore: add Coder service prefix to tailnet (#14943)
re:#14715This PR introduces the Coder service prefix: `fd60:627a:a42b::/48` and refactors our existing code as calling the Tailscale service prefix explicitly (rather than implicitly).Removes the unused `Addresses` agent option. All clients today assume they can compute the Agent's IP address based on its UUID, so an agent started with a custom address would break things.
1 parent68ec532 commit7d9f5ab

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16 files changed

+120
-75
lines changed

16 files changed

+120
-75
lines changed

‎agent/agent.go

Lines changed: 4 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -82,7 +82,6 @@ type Options struct {
8282
SSHMaxTimeout time.Duration
8383
TailnetListenPortuint16
8484
Subsystems []codersdk.AgentSubsystem
85-
Addresses []netip.Prefix
8685
PrometheusRegistry*prometheus.Registry
8786
ReportMetadataInterval time.Duration
8887
ServiceBannerRefreshInterval time.Duration
@@ -180,7 +179,6 @@ func New(options Options) Agent {
180179
announcementBannersRefreshInterval:options.ServiceBannerRefreshInterval,
181180
sshMaxTimeout:options.SSHMaxTimeout,
182181
subsystems:options.Subsystems,
183-
addresses:options.Addresses,
184182
syscaller:options.Syscaller,
185183
modifiedProcs:options.ModifiedProcesses,
186184
processManagementTick:options.ProcessManagementTick,
@@ -250,7 +248,6 @@ type agent struct {
250248
lifecycleLastReportedIndexint// Keeps track of the last lifecycle state we successfully reported.
251249

252250
network*tailnet.Conn
253-
addresses []netip.Prefix
254251
statsReporter*statsReporter
255252
logSender*agentsdk.LogSender
256253

@@ -1112,15 +1109,11 @@ func (a *agent) updateCommandEnv(current []string) (updated []string, err error)
11121109
returnupdated,nil
11131110
}
11141111

1115-
func (a*agent)wireguardAddresses(agentID uuid.UUID) []netip.Prefix {
1116-
iflen(a.addresses)==0 {
1117-
return []netip.Prefix{
1118-
// This is the IP that should be used primarily.
1119-
netip.PrefixFrom(tailnet.IPFromUUID(agentID),128),
1120-
}
1112+
func (*agent)wireguardAddresses(agentID uuid.UUID) []netip.Prefix {
1113+
return []netip.Prefix{
1114+
// This is the IP that should be used primarily.
1115+
tailnet.TailscaleServicePrefix.PrefixFromUUID(agentID),
11211116
}
1122-
1123-
returna.addresses
11241117
}
11251118

11261119
func (a*agent)trackGoroutine(fnfunc())error {

‎agent/agent_test.go

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1880,7 +1880,7 @@ func TestAgent_UpdatedDERP(t *testing.T) {
18801880
// Setup a client connection.
18811881
newClientConn:=func(derpMap*tailcfg.DERPMap,namestring)*workspacesdk.AgentConn {
18821882
conn,err:=tailnet.NewConn(&tailnet.Options{
1883-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
1883+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
18841884
DERPMap:derpMap,
18851885
Logger:logger.Named(name),
18861886
})
@@ -2372,7 +2372,7 @@ func setupAgent(t *testing.T, metadata agentsdk.Manifest, ptyTimeout time.Durati
23722372
_=agnt.Close()
23732373
})
23742374
conn,err:=tailnet.NewConn(&tailnet.Options{
2375-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
2375+
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.TailscaleServicePrefix.RandomAddr(),128)},
23762376
DERPMap:metadata.DERPMap,
23772377
Logger:logger.Named("client"),
23782378
})

‎coderd/coderd_test.go

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -83,7 +83,7 @@ func TestDERP(t *testing.T) {
8383
},
8484
},
8585
}
86-
w1IP:=tailnet.IP()
86+
w1IP:=tailnet.TailscaleServicePrefix.RandomAddr()
8787
w1,err:=tailnet.NewConn(&tailnet.Options{
8888
Addresses: []netip.Prefix{netip.PrefixFrom(w1IP,128)},
8989
Logger:logger.Named("w1"),
@@ -92,7 +92,7 @@ func TestDERP(t *testing.T) {
9292
require.NoError(t,err)
9393

9494
w2,err:=tailnet.NewConn(&tailnet.Options{
95-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
95+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
9696
Logger:logger.Named("w2"),
9797
DERPMap:derpMap,
9898
})

‎coderd/tailnet.go

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -61,7 +61,7 @@ func NewServerTailnet(
6161
) (*ServerTailnet,error) {
6262
logger=logger.Named("servertailnet")
6363
conn,err:=tailnet.NewConn(&tailnet.Options{
64-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
64+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
6565
DERPForceWebSockets:derpForceWebSockets,
6666
Logger:logger,
6767
BlockEndpoints:blockEndpoints,
@@ -352,7 +352,7 @@ func (s *ServerTailnet) ReverseProxy(targetURL, dashboardURL *url.URL, agentID u
352352
// "localhost:port", causing connections to be shared across agents.
353353
tgt:=*targetURL
354354
_,port,_:=net.SplitHostPort(tgt.Host)
355-
tgt.Host=net.JoinHostPort(tailnet.IPFromUUID(agentID).String(),port)
355+
tgt.Host=net.JoinHostPort(tailnet.TailscaleServicePrefix.AddrFromUUID(agentID).String(),port)
356356

357357
proxy:=httputil.NewSingleHostReverseProxy(&tgt)
358358
proxy.ErrorHandler=func(w http.ResponseWriter,r*http.Request,theErrerror) {

‎coderd/tailnet_test.go

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -186,7 +186,9 @@ func TestServerTailnet_ReverseProxy(t *testing.T) {
186186
// Ensure the reverse proxy director rewrites the url host to the agent's IP.
187187
rp.Director(req)
188188
assert.Equal(t,
189-
fmt.Sprintf("[%s]:%d",tailnet.IPFromUUID(a.id).String(),workspacesdk.AgentHTTPAPIServerPort),
189+
fmt.Sprintf("[%s]:%d",
190+
tailnet.TailscaleServicePrefix.AddrFromUUID(a.id).String(),
191+
workspacesdk.AgentHTTPAPIServerPort),
190192
req.URL.Host,
191193
)
192194
})

‎codersdk/workspacesdk/agentconn.go

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ type AgentConnOptions struct {
5151
}
5252

5353
func (c*AgentConn)agentAddress() netip.Addr {
54-
returntailnet.IPFromUUID(c.opts.AgentID)
54+
returntailnet.TailscaleServicePrefix.AddrFromUUID(c.opts.AgentID)
5555
}
5656

5757
// AwaitReachable waits for the agent to be reachable.

‎codersdk/workspacesdk/workspacesdk.go

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -236,7 +236,7 @@ func (c *Client) DialAgent(dialCtx context.Context, agentID uuid.UUID, options *
236236
CompressionMode:websocket.CompressionDisabled,
237237
})
238238

239-
ip:=tailnet.IP()
239+
ip:=tailnet.TailscaleServicePrefix.RandomAddr()
240240
varheader http.Header
241241
ifheaderTransport,ok:=c.client.HTTPClient.Transport.(*codersdk.HeaderTransport);ok {
242242
header=headerTransport.Header

‎enterprise/tailnet/pgcoord_test.go

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -120,7 +120,7 @@ func TestPGCoordinatorSingle_AgentInvalidIP(t *testing.T) {
120120
deferagent.Close(ctx)
121121
agent.UpdateNode(&proto.Node{
122122
Addresses: []string{
123-
netip.PrefixFrom(agpl.IP(),128).String(),
123+
agpl.TailscaleServicePrefix.RandomPrefix().String(),
124124
},
125125
PreferredDerp:10,
126126
})
@@ -147,7 +147,7 @@ func TestPGCoordinatorSingle_AgentInvalidIPBits(t *testing.T) {
147147
deferagent.Close(ctx)
148148
agent.UpdateNode(&proto.Node{
149149
Addresses: []string{
150-
netip.PrefixFrom(agpl.IPFromUUID(agent.ID),64).String(),
150+
netip.PrefixFrom(agpl.TailscaleServicePrefix.AddrFromUUID(agent.ID),64).String(),
151151
},
152152
PreferredDerp:10,
153153
})
@@ -174,7 +174,7 @@ func TestPGCoordinatorSingle_AgentValidIP(t *testing.T) {
174174
deferagent.Close(ctx)
175175
agent.UpdateNode(&proto.Node{
176176
Addresses: []string{
177-
netip.PrefixFrom(agpl.IPFromUUID(agent.ID),128).String(),
177+
agpl.TailscaleServicePrefix.PrefixFromUUID(agent.ID).String(),
178178
},
179179
PreferredDerp:10,
180180
})

‎tailnet/conn.go

Lines changed: 37 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -327,28 +327,48 @@ func NewConn(options *Options) (conn *Conn, err error) {
327327
returnserver,nil
328328
}
329329

330-
funcmaskUUID(uid uuid.UUID) uuid.UUID {
331-
// This is Tailscale's ephemeral service prefix. This can be changed easily
332-
// later-on, because all of our nodes are ephemeral.
333-
// fd7a:115c:a1e0
334-
uid[0]=0xfd
335-
uid[1]=0x7a
336-
uid[2]=0x11
337-
uid[3]=0x5c
338-
uid[4]=0xa1
339-
uid[5]=0xe0
330+
typeServicePrefix [6]byte
331+
332+
var (
333+
// TailscaleServicePrefix is the IPv6 prefix for all tailnet nodes since it was first added to
334+
// Coder. It is identical to the service prefix Tailscale.com uses. With the introduction of
335+
// CoderVPN, we would like to stop using the Tailscale prefix so that we don't conflict with
336+
// Tailscale if both are installed at the same time. However, there are a large number of agents
337+
// and clients using this prefix, so we need to carefully manage deprecation and eventual
338+
// removal.
339+
// fd7a:115c:a1e0:://48
340+
TailscaleServicePrefixServicePrefix= [6]byte{0xfd,0x7a,0x11,0x5c,0xa1,0xe0}
341+
// CoderServicePrefix is the Coder-specific IPv6 prefix for tailnet nodes, which we are in the
342+
// process of migrating to. It allows Coder to run alongside Tailscale without conflicts even
343+
// if both are set up as TUN interfaces into the OS (e.g. CoderVPN).
344+
// fd60:627a:a42b::/48
345+
CoderServicePrefixServicePrefix= [6]byte{0xfd,0x60,0x62,0x7a,0xa4,0x2b}
346+
)
347+
348+
// maskUUID returns a new UUID with the first 6 bytes changed to the ServicePrefix
349+
func (pServicePrefix)maskUUID(uid uuid.UUID) uuid.UUID {
350+
copy(uid[:],p[:])
340351
returnuid
341352
}
342353

343-
// IP generates a random IP with a static service prefix.
344-
funcIP() netip.Addr {
345-
uid:=maskUUID(uuid.New())
346-
returnnetip.AddrFrom16(uid)
354+
// RandomAddr returns a random IP address in the service prefix.
355+
func (pServicePrefix)RandomAddr() netip.Addr {
356+
returnnetip.AddrFrom16(p.maskUUID(uuid.New()))
357+
}
358+
359+
// AddrFromUUID returns an IPv6 address corresponding to the given UUID in the service prefix.
360+
func (pServicePrefix)AddrFromUUID(uid uuid.UUID) netip.Addr {
361+
returnnetip.AddrFrom16(p.maskUUID(uid))
362+
}
363+
364+
// PrefixFromUUID returns a single IPv6 /128 prefix corresponding to the given UUID.
365+
func (pServicePrefix)PrefixFromUUID(uid uuid.UUID) netip.Prefix {
366+
returnnetip.PrefixFrom(p.AddrFromUUID(uid),128)
347367
}
348368

349-
//IP generates anew IP from a UUID.
350-
funcIPFromUUID(uid uuid.UUID)netip.Addr {
351-
returnnetip.AddrFrom16(maskUUID(uid))
369+
//RandomPrefix returns asingle IPv6 /128 prefix within the service prefix.
370+
func(pServicePrefix)RandomPrefix()netip.Prefix {
371+
returnnetip.PrefixFrom(p.RandomAddr(),128)
352372
}
353373

354374
// Conn is an actively listening Wireguard connection.

‎tailnet/conn_test.go

Lines changed: 44 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -3,6 +3,7 @@ package tailnet_test
33
import (
44
"context"
55
"net/netip"
6+
"strings"
67
"testing"
78
"time"
89

@@ -30,7 +31,7 @@ func TestTailnet(t *testing.T) {
3031
t.Parallel()
3132
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
3233
conn,err:=tailnet.NewConn(&tailnet.Options{
33-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
34+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
3435
Logger:logger.Named("w1"),
3536
DERPMap:derpMap,
3637
})
@@ -42,7 +43,7 @@ func TestTailnet(t *testing.T) {
4243
t.Parallel()
4344
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
4445
ctx:=testutil.Context(t,testutil.WaitLong)
45-
w1IP:=tailnet.IP()
46+
w1IP:=tailnet.TailscaleServicePrefix.RandomAddr()
4647
w1,err:=tailnet.NewConn(&tailnet.Options{
4748
Addresses: []netip.Prefix{netip.PrefixFrom(w1IP,128)},
4849
Logger:logger.Named("w1"),
@@ -51,7 +52,7 @@ func TestTailnet(t *testing.T) {
5152
require.NoError(t,err)
5253

5354
w2,err:=tailnet.NewConn(&tailnet.Options{
54-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
55+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
5556
Logger:logger.Named("w2"),
5657
DERPMap:derpMap,
5758
})
@@ -106,7 +107,7 @@ func TestTailnet(t *testing.T) {
106107
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
107108
ctx:=testutil.Context(t,testutil.WaitMedium)
108109

109-
w1IP:=tailnet.IP()
110+
w1IP:=tailnet.TailscaleServicePrefix.RandomAddr()
110111
derpMap:=tailnettest.RunDERPOnlyWebSockets(t)
111112
w1,err:=tailnet.NewConn(&tailnet.Options{
112113
Addresses: []netip.Prefix{netip.PrefixFrom(w1IP,128)},
@@ -117,7 +118,7 @@ func TestTailnet(t *testing.T) {
117118
require.NoError(t,err)
118119

119120
w2,err:=tailnet.NewConn(&tailnet.Options{
120-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
121+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
121122
Logger:logger.Named("w2"),
122123
DERPMap:derpMap,
123124
BlockEndpoints:true,
@@ -168,7 +169,7 @@ func TestTailnet(t *testing.T) {
168169
t.Parallel()
169170
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
170171
ctx:=testutil.Context(t,testutil.WaitLong)
171-
w1IP:=tailnet.IP()
172+
w1IP:=tailnet.TailscaleServicePrefix.RandomAddr()
172173
w1,err:=tailnet.NewConn(&tailnet.Options{
173174
Addresses: []netip.Prefix{netip.PrefixFrom(w1IP,128)},
174175
Logger:logger.Named("w1"),
@@ -177,7 +178,7 @@ func TestTailnet(t *testing.T) {
177178
require.NoError(t,err)
178179

179180
w2,err:=tailnet.NewConn(&tailnet.Options{
180-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
181+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
181182
Logger:logger.Named("w2"),
182183
DERPMap:derpMap,
183184
})
@@ -211,7 +212,7 @@ func TestTailnet(t *testing.T) {
211212
t.Parallel()
212213
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
213214
ctx:=testutil.Context(t,testutil.WaitLong)
214-
w1IP:=tailnet.IP()
215+
w1IP:=tailnet.TailscaleServicePrefix.RandomAddr()
215216
w1,err:=tailnet.NewConn(&tailnet.Options{
216217
Addresses: []netip.Prefix{netip.PrefixFrom(w1IP,128)},
217218
Logger:logger.Named("w1"),
@@ -221,7 +222,7 @@ func TestTailnet(t *testing.T) {
221222
require.NoError(t,err)
222223

223224
w2,err:=tailnet.NewConn(&tailnet.Options{
224-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
225+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
225226
Logger:logger.Named("w2"),
226227
DERPMap:derpMap,
227228
BlockEndpoints:true,
@@ -261,7 +262,7 @@ func TestConn_PreferredDERP(t *testing.T) {
261262
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
262263
derpMap,_:=tailnettest.RunDERPAndSTUN(t)
263264
conn,err:=tailnet.NewConn(&tailnet.Options{
264-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
265+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
265266
Logger:logger.Named("w1"),
266267
DERPMap:derpMap,
267268
})
@@ -290,7 +291,7 @@ func TestConn_UpdateDERP(t *testing.T) {
290291
logger:=slogtest.Make(t,nil).Leveled(slog.LevelDebug)
291292

292293
derpMap1,_:=tailnettest.RunDERPAndSTUN(t)
293-
ip:=tailnet.IP()
294+
ip:=tailnet.TailscaleServicePrefix.RandomAddr()
294295
conn,err:=tailnet.NewConn(&tailnet.Options{
295296
Addresses: []netip.Prefix{netip.PrefixFrom(ip,128)},
296297
Logger:logger.Named("w1"),
@@ -320,7 +321,7 @@ func TestConn_UpdateDERP(t *testing.T) {
320321

321322
// Connect from a different client.
322323
client1,err:=tailnet.NewConn(&tailnet.Options{
323-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
324+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
324325
Logger:logger.Named("client1"),
325326
DERPMap:derpMap1,
326327
BlockEndpoints:true,
@@ -394,7 +395,7 @@ parentLoop:
394395
// Connect from a different different client with up-to-date derp map and
395396
// nodes.
396397
client2,err:=tailnet.NewConn(&tailnet.Options{
397-
Addresses: []netip.Prefix{netip.PrefixFrom(tailnet.IP(),128)},
398+
Addresses: []netip.Prefix{tailnet.TailscaleServicePrefix.RandomPrefix()},
398399
Logger:logger.Named("client2"),
399400
DERPMap:derpMap2,
400401
BlockEndpoints:true,
@@ -425,7 +426,7 @@ func TestConn_BlockEndpoints(t *testing.T) {
425426
derpMap,_:=tailnettest.RunDERPAndSTUN(t)
426427

427428
// Setup conn 1.
428-
ip1:=tailnet.IP()
429+
ip1:=tailnet.TailscaleServicePrefix.RandomAddr()
429430
conn1,err:=tailnet.NewConn(&tailnet.Options{
430431
Addresses: []netip.Prefix{netip.PrefixFrom(ip1,128)},
431432
Logger:logger.Named("w1"),
@@ -439,7 +440,7 @@ func TestConn_BlockEndpoints(t *testing.T) {
439440
}()
440441

441442
// Setup conn 2.
442-
ip2:=tailnet.IP()
443+
ip2:=tailnet.TailscaleServicePrefix.RandomAddr()
443444
conn2,err:=tailnet.NewConn(&tailnet.Options{
444445
Addresses: []netip.Prefix{netip.PrefixFrom(ip2,128)},
445446
Logger:logger.Named("w2"),
@@ -492,3 +493,31 @@ func stitch(t *testing.T, dst, src *tailnet.Conn) {
492493
assert.NoError(t,err)
493494
})
494495
}
496+
497+
funcTestTailscaleServicePrefix(t*testing.T) {
498+
t.Parallel()
499+
a:=tailnet.TailscaleServicePrefix.RandomAddr()
500+
require.True(t,strings.HasPrefix(a.String(),"fd7a:115c:a1e0"))
501+
p:=tailnet.TailscaleServicePrefix.RandomPrefix()
502+
require.True(t,strings.HasPrefix(p.String(),"fd7a:115c:a1e0"))
503+
require.True(t,strings.HasSuffix(p.String(),"/128"))
504+
u:=uuid.MustParse("aaaaaaaa-aaaa-aaaa-aaaa-123456789abc")
505+
a=tailnet.TailscaleServicePrefix.AddrFromUUID(u)
506+
require.Equal(t,"fd7a:115c:a1e0:aaaa:aaaa:1234:5678:9abc",a.String())
507+
p=tailnet.TailscaleServicePrefix.PrefixFromUUID(u)
508+
require.Equal(t,"fd7a:115c:a1e0:aaaa:aaaa:1234:5678:9abc/128",p.String())
509+
}
510+
511+
funcTestCoderServicePrefix(t*testing.T) {
512+
t.Parallel()
513+
a:=tailnet.CoderServicePrefix.RandomAddr()
514+
require.True(t,strings.HasPrefix(a.String(),"fd60:627a:a42b"))
515+
p:=tailnet.CoderServicePrefix.RandomPrefix()
516+
require.True(t,strings.HasPrefix(p.String(),"fd60:627a:a42b"))
517+
require.True(t,strings.HasSuffix(p.String(),"/128"))
518+
u:=uuid.MustParse("aaaaaaaa-aaaa-aaaa-aaaa-123456789abc")
519+
a=tailnet.CoderServicePrefix.AddrFromUUID(u)
520+
require.Equal(t,"fd60:627a:a42b:aaaa:aaaa:1234:5678:9abc",a.String())
521+
p=tailnet.CoderServicePrefix.PrefixFromUUID(u)
522+
require.Equal(t,"fd60:627a:a42b:aaaa:aaaa:1234:5678:9abc/128",p.String())
523+
}

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