/
daemon.go
356 lines (304 loc) · 7.44 KB
/
daemon.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 main
import (
"bytes"
"crypto/tls"
"crypto/x509"
"database/sql"
"fmt"
"net"
"net/http"
"os"
"github.com/gorilla/mux"
"github.com/lxc/lxd"
"github.com/lxc/lxd/shared"
_ "github.com/stgraber/lxd-go-sqlite3"
"gopkg.in/tomb.v2"
)
// A Daemon can respond to requests from a shared client.
type Daemon struct {
tomb tomb.Tomb
unixl net.Listener
tcpl net.Listener
idMap *shared.Idmap
lxcpath string
certf string
keyf string
mux *mux.Router
clientCerts map[string]x509.Certificate
db *sql.DB
tlsconfig *tls.Config
}
type Command struct {
name string
untrustedGet bool
untrustedPost bool
get func(d *Daemon, r *http.Request) Response
put func(d *Daemon, r *http.Request) Response
post func(d *Daemon, r *http.Request) Response
delete func(d *Daemon, r *http.Request) Response
}
func (d *Daemon) httpGetSync(url string) (*lxd.Response, error) {
var err error
if d.tlsconfig == nil {
d.tlsconfig, err = shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return nil, err
}
}
tr := &http.Transport{
TLSClientConfig: d.tlsconfig,
Dial: shared.RFC3493Dialer,
}
myhttp := http.Client{
Transport: tr,
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", shared.UserAgent)
r, err := myhttp.Do(req)
if err != nil {
return nil, err
}
resp, err := lxd.ParseResponse(r)
if err != nil {
return nil, err
}
if resp.Type != lxd.Sync {
return nil, fmt.Errorf("unexpected non-sync response!")
}
return resp, nil
}
func (d *Daemon) httpGetFile(url string) (*http.Response, error) {
var err error
if d.tlsconfig == nil {
d.tlsconfig, err = shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
return nil, err
}
}
tr := &http.Transport{
TLSClientConfig: d.tlsconfig,
Dial: shared.RFC3493Dialer,
}
myhttp := http.Client{
Transport: tr,
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
req.Header.Set("User-Agent", shared.UserAgent)
raw, err := myhttp.Do(req)
if err != nil {
return nil, err
}
if raw.StatusCode != 200 {
_, err := lxd.HoistResponse(raw, lxd.Error)
if err != nil {
return nil, err
}
return nil, fmt.Errorf("non-200 status with no error response?")
}
return raw, nil
}
func readMyCert() (string, string, error) {
certf := shared.VarPath("server.crt")
keyf := shared.VarPath("server.key")
shared.Debugf("looking for existing certificates: %s %s", certf, keyf)
err := shared.FindOrGenCert(certf, keyf)
return certf, keyf, err
}
func (d *Daemon) isTrustedClient(r *http.Request) bool {
if r.RemoteAddr == "@" {
// Unix socket
return true
}
if r.TLS == nil {
return false
}
for i := range r.TLS.PeerCertificates {
if d.CheckTrustState(*r.TLS.PeerCertificates[i]) {
return true
}
}
return false
}
func (d *Daemon) createCmd(version string, c Command) {
var uri string
if c.name == "" {
uri = fmt.Sprintf("/%s", version)
} else {
uri = fmt.Sprintf("/%s/%s", version, c.name)
}
d.mux.HandleFunc(uri, func(w http.ResponseWriter, r *http.Request) {
if d.isTrustedClient(r) {
shared.Debugf("handling %s %s", r.Method, r.URL.RequestURI())
} else if r.Method == "GET" && c.untrustedGet {
shared.Debugf("allowing untrusted GET to %s", r.URL.RequestURI())
} else if r.Method == "POST" && c.untrustedPost {
shared.Debugf("allowing untrusted POST to %s", r.URL.RequestURI())
} else {
shared.Debugf("rejecting request from untrusted client")
Forbidden.Render(w)
return
}
var resp Response
resp = NotImplemented
switch r.Method {
case "GET":
if c.get != nil {
resp = c.get(d, r)
}
case "PUT":
if c.put != nil {
resp = c.put(d, r)
}
case "POST":
if c.post != nil {
resp = c.post(d, r)
}
case "DELETE":
if c.delete != nil {
resp = c.delete(d, r)
}
default:
resp = NotFound
}
if err := resp.Render(w); err != nil {
err := InternalError(err).Render(w)
if err != nil {
shared.Debugf("failed writing error for error, giving up.")
}
}
})
}
// StartDaemon starts the shared daemon with the provided configuration.
func StartDaemon(listenAddr string) (*Daemon, error) {
d := &Daemon{}
d.lxcpath = shared.VarPath("lxc")
err := os.MkdirAll(shared.VarPath("/"), 0755)
if err != nil {
return nil, err
}
err = os.MkdirAll(d.lxcpath, 0755)
if err != nil {
return nil, err
}
certf, keyf, err := readMyCert()
if err != nil {
return nil, err
}
d.certf = certf
d.keyf = keyf
err = initDb(d)
if err != nil {
return nil, err
}
readSavedClientCAList(d)
d.mux = mux.NewRouter()
d.mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
SyncResponse(true, []string{"/1.0"}).Render(w)
})
for _, c := range api10 {
d.createCmd("1.0", c)
}
d.mux.NotFoundHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
shared.Debugf("sending top level 404: %s", r.URL)
NotFound.Render(w)
})
d.idMap, err = shared.NewIdmap()
if err != nil {
shared.Logf("error reading idmap: %s", err.Error())
shared.Logf("operations requiring idmap will not be available")
} else {
shared.Debugf("idmap is %d %d %d %d\n",
d.idMap.Uidmin,
d.idMap.Uidrange,
d.idMap.Gidmin,
d.idMap.Gidrange)
}
localSocket := shared.VarPath("unix.socket")
// If the socket exists, let's try to connect to it and see if there's
// a lxd running.
if _, err := os.Stat(localSocket); err == nil {
c := &lxd.Config{Remotes: map[string]lxd.RemoteConfig{}}
_, err := lxd.NewClient(c, "")
if err != nil {
shared.Debugf("Detected old but dead unix socket, deleting it...")
// Connecting failed, so let's delete the socket and
// listen on it ourselves.
err = os.Remove(localSocket)
if err != nil {
return nil, err
}
}
}
unixAddr, err := net.ResolveUnixAddr("unix", localSocket)
if err != nil {
return nil, fmt.Errorf("cannot resolve unix socket address: %v", err)
}
unixl, err := net.ListenUnix("unix", unixAddr)
if err != nil {
return nil, fmt.Errorf("cannot listen on unix socket: %v", err)
}
d.unixl = unixl
if err := os.Chmod(localSocket, 0775); err != nil {
return nil, err
}
gid, err := shared.GroupId(*group)
if err != nil {
return nil, err
}
if err := os.Chown(localSocket, os.Getuid(), gid); err != nil {
return nil, err
}
var tcpListen func() error
if listenAddr != "" {
config, err := shared.GetTLSConfig(d.certf, d.keyf)
if err != nil {
d.unixl.Close()
return nil, err
}
tcpl, err := tls.Listen("tcp", listenAddr, config)
if err != nil {
d.unixl.Close()
return nil, fmt.Errorf("cannot listen on unix socket: %v", err)
}
d.tcpl = tcpl
tcpListen = func() error { return http.Serve(d.tcpl, d.mux) }
}
d.tomb.Go(func() error {
if tcpListen != nil {
d.tomb.Go(tcpListen)
}
d.tomb.Go(func() error { return http.Serve(d.unixl, d.mux) })
return nil
})
return d, nil
}
func (d *Daemon) CheckTrustState(cert x509.Certificate) bool {
for k, v := range d.clientCerts {
if bytes.Compare(cert.Raw, v.Raw) == 0 {
shared.Debugf("found cert for %s", k)
return true
}
shared.Debugf("client cert != key for %s", k)
}
return false
}
var errStop = fmt.Errorf("requested stop")
// Stop stops the shared daemon.
func (d *Daemon) Stop() error {
d.tomb.Kill(errStop)
d.unixl.Close()
if d.tcpl != nil {
d.tcpl.Close()
}
err := d.tomb.Wait()
if err == errStop {
return nil
}
return err
}