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2fe58dfd SE |
1 | /* site.c - manage communication with a remote network site */ |
2 | ||
3 | #include <stdio.h> | |
4 | #include <sys/mman.h> | |
5 | ||
6 | #include "secnet.h" | |
7 | #include "util.h" | |
8 | ||
9 | #define SETUP_BUFFER_LEN 2048 | |
10 | ||
11 | #define DEFAULT_KEY_LIFETIME 15000 | |
12 | #define DEFAULT_SETUP_RETRIES 5 | |
13 | #define DEFAULT_SETUP_TIMEOUT 500 | |
14 | #define DEFAULT_WAIT_TIME 10000 | |
15 | ||
16 | /* Each site can be in one of several possible states. */ | |
17 | ||
18 | /* States: | |
19 | SITE_STOP - nothing is allowed to happen; tunnel is down; | |
20 | all session keys have been erased | |
21 | -> SITE_RUN upon external instruction | |
22 | SITE_RUN - site up, maybe with valid key | |
23 | -> SITE_RESOLVE upon outgoing packet and no valid key | |
24 | we start name resolution for the other end of the tunnel | |
25 | -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time | |
26 | we send an appropriate message 2 | |
27 | SITE_RESOLVE - waiting for name resolution | |
28 | -> SITE_SENTMSG1 upon successful resolution | |
29 | we send an appropriate message 1 | |
30 | -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution) | |
31 | we abort resolution and | |
32 | -> SITE_WAIT on timeout or resolution failure | |
33 | SITE_SENTMSG1 | |
34 | -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end | |
35 | -> SITE_SENTMSG3 upon valid incoming message 2 | |
36 | -> SITE_WAIT on timeout | |
37 | SITE_SENTMSG2 | |
38 | -> SITE_SENTMSG4 upon valid incoming message 3 | |
39 | -> SITE_WAIT on timeout | |
40 | SITE_SENTMSG3 | |
41 | -> SITE_SENTMSG5 upon valid incoming message 4 | |
42 | -> SITE_WAIT on timeout | |
43 | SITE_SENTMSG4 | |
44 | -> SITE_RUN upon valid incoming message 5 | |
45 | -> SITE_WAIT on timeout | |
46 | SITE_SENTMSG5 | |
47 | -> SITE_RUN upon valid incoming message 6 | |
48 | -> SITE_WAIT on timeout | |
49 | SITE_WAIT - failed to establish key; do nothing for a while | |
50 | -> SITE_RUN on timeout | |
51 | */ | |
52 | ||
53 | #define SITE_STOP 0 | |
54 | #define SITE_RUN 1 | |
55 | #define SITE_RESOLVE 2 | |
56 | #define SITE_SENTMSG1 3 | |
57 | #define SITE_SENTMSG2 4 | |
58 | #define SITE_SENTMSG3 5 | |
59 | #define SITE_SENTMSG4 6 | |
60 | #define SITE_SENTMSG5 7 | |
61 | #define SITE_WAIT 8 | |
62 | ||
63 | static string_t state_name(uint32_t state) | |
64 | { | |
65 | switch (state) { | |
66 | case 0: return "SITE_STOP"; | |
67 | case 1: return "SITE_RUN"; | |
68 | case 2: return "SITE_RESOLVE"; | |
69 | case 3: return "SITE_SENTMSG1"; | |
70 | case 4: return "SITE_SENTMSG2"; | |
71 | case 5: return "SITE_SENTMSG3"; | |
72 | case 6: return "SITE_SENTMSG4"; | |
73 | case 7: return "SITE_SENTMSG5"; | |
74 | case 8: return "SITE_WAIT"; | |
75 | default: return "*bad state*"; | |
76 | } | |
77 | } | |
78 | ||
79 | #define LABEL_MSG0 0x00020200 | |
80 | #define LABEL_MSG1 0x01010101 | |
81 | #define LABEL_MSG2 0x02020202 | |
82 | #define LABEL_MSG3 0x03030303 | |
83 | #define LABEL_MSG4 0x04040404 | |
84 | #define LABEL_MSG5 0x05050505 | |
85 | #define LABEL_MSG6 0x06060606 | |
86 | #define LABEL_MSG7 0x07070707 | |
87 | #define LABEL_MSG8 0x08080808 | |
88 | #define LABEL_MSG9 0x09090909 | |
89 | ||
90 | #define NONCELEN 8 | |
91 | ||
92 | #define LOG_UNEXPECTED 0x00000001 | |
93 | #define LOG_SETUP_INIT 0x00000002 | |
94 | #define LOG_SETUP_TIMEOUT 0x00000004 | |
95 | #define LOG_ACTIVATE_KEY 0x00000008 | |
96 | #define LOG_TIMEOUT_KEY 0x00000010 | |
97 | #define LOG_SECURITY 0x00000020 | |
98 | #define LOG_STATE 0x00000040 | |
99 | #define LOG_DROP 0x00000080 | |
100 | #define LOG_DUMP 0x00000100 | |
101 | #define LOG_ERROR 0x00000400 | |
102 | ||
103 | struct site { | |
104 | closure_t cl; | |
105 | struct site_if ops; | |
106 | /* configuration information */ | |
107 | string_t localname; | |
108 | string_t remotename; | |
109 | string_t address; /* DNS name for bootstrapping, optional */ | |
110 | int remoteport; | |
111 | struct netlink_if *netlink; | |
112 | struct comm_if *comm; | |
113 | struct resolver_if *resolver; | |
114 | struct log_if *log; | |
115 | struct random_if *random; | |
116 | struct rsaprivkey_if *privkey; | |
117 | struct subnet_list remotenets; | |
118 | struct rsapubkey_if *pubkey; | |
119 | struct transform_if *transform; | |
120 | struct dh_if *dh; | |
121 | struct hash_if *hash; | |
122 | void *netlink_cid; | |
123 | ||
124 | uint32_t setup_retries; /* How many times to send setup packets */ | |
125 | uint32_t setup_timeout; /* Initial timeout for setup packets */ | |
126 | uint32_t wait_timeout; /* How long to wait if setup unsuccessful */ | |
127 | uint32_t key_lifetime; /* How long a key lasts once set up */ | |
128 | ||
129 | uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */ | |
130 | uint32_t setupsiglen; /* Allows us to discard packets quickly if | |
131 | they are not for us */ | |
132 | bool_t setup_priority; /* Do we have precedence if both sites emit | |
133 | message 1 simultaneously? */ | |
134 | uint32_t log_events; | |
135 | ||
136 | /* runtime information */ | |
137 | uint32_t state; | |
138 | uint64_t now; /* Most recently seen time */ | |
139 | ||
140 | uint32_t remote_session_id; | |
141 | struct transform_inst_if *current_transform; | |
142 | bool_t current_valid; | |
143 | uint64_t current_key_timeout; /* End of life of current key */ | |
144 | struct sockaddr_in peer; /* Current address of peer */ | |
145 | bool_t peer_valid; /* Peer address becomes invalid when key times out, | |
146 | but only if we have a DNS name for our peer */ | |
147 | ||
148 | uint32_t setup_session_id; | |
149 | struct sockaddr_in setup_peer; | |
150 | uint8_t localN[NONCELEN]; /* Nonces for key exchange */ | |
151 | uint8_t remoteN[NONCELEN]; | |
152 | struct buffer_if buffer; /* Current outgoing key exchange packet */ | |
153 | uint32_t retries; /* Number of retries remaining */ | |
154 | uint64_t timeout; /* Timeout for current state */ | |
155 | uint8_t *dhsecret; | |
156 | uint8_t *sharedsecret; | |
157 | ||
158 | struct transform_inst_if *new_transform; /* For key setup/verify */ | |
159 | }; | |
160 | ||
161 | static void slog(struct site *st, uint32_t event, string_t msg, ...) | |
162 | { | |
163 | va_list ap; | |
164 | uint8_t buf[240]; | |
165 | ||
166 | va_start(ap,msg); | |
167 | ||
168 | if (event&st->log_events) { | |
169 | vsnprintf(buf,240,msg,ap); | |
170 | st->log->log(st->log->st,0,"%s<->%s: %s",st->localname,st->remotename, | |
171 | buf); | |
172 | } | |
173 | va_end(ap); | |
174 | } | |
175 | ||
176 | static void enter_state_run(struct site *st); | |
177 | static bool_t enter_state_resolve(struct site *st); | |
178 | static bool_t enter_state_sentmsg1(struct site *st); | |
179 | static bool_t enter_state_sentmsg2(struct site *st); | |
180 | static bool_t enter_state_sentmsg3(struct site *st); | |
181 | static bool_t enter_state_sentmsg4(struct site *st); | |
182 | static bool_t enter_state_sentmsg5(struct site *st); | |
183 | static void enter_state_wait(struct site *st); | |
184 | ||
185 | #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) | |
186 | #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) | |
187 | #define CHECK_TYPE(b,t) do { uint32_t type; \ | |
188 | CHECK_AVAIL((b),4); \ | |
189 | type=*(uint32_t *)buf_unprepend((b),4); \ | |
190 | if (type!=(t)) return False; } while(0) | |
191 | ||
192 | struct msg { | |
193 | uint8_t *hashstart; | |
194 | uint32_t dest; | |
195 | uint32_t source; | |
196 | uint32_t remlen; | |
197 | uint8_t *remote; | |
198 | uint32_t loclen; | |
199 | uint8_t *local; | |
200 | uint8_t *nR; | |
201 | uint8_t *nL; | |
202 | uint32_t pklen; | |
203 | uint8_t *pk; | |
204 | uint32_t hashlen; | |
205 | uint32_t siglen; | |
206 | uint8_t *sig; | |
207 | }; | |
208 | ||
209 | /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside out | |
210 | using a transform. */ | |
211 | static bool_t generate_msg(struct site *st, uint32_t type, string_t what) | |
212 | { | |
213 | void *hst; | |
214 | uint8_t *hash=alloca(st->hash->len); | |
215 | string_t dhpub, sig; | |
216 | ||
217 | st->retries=st->setup_retries; | |
218 | BUF_ALLOC(&st->buffer,what); | |
219 | buffer_init(&st->buffer,0); | |
220 | *(uint32_t *)buf_append(&st->buffer,4)= | |
221 | (type==LABEL_MSG1?0:st->setup_session_id); | |
222 | *(uint32_t *)buf_append(&st->buffer,4)=(uint32_t)st; | |
223 | *(uint32_t *)buf_append(&st->buffer,4)=type; | |
224 | buf_append_string(&st->buffer,st->localname); | |
225 | buf_append_string(&st->buffer,st->remotename); | |
226 | memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN); | |
227 | if (type==LABEL_MSG1) return True; | |
228 | memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN); | |
229 | if (type==LABEL_MSG2) return True; | |
230 | dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); | |
231 | buf_append_string(&st->buffer,dhpub); | |
232 | free(dhpub); | |
233 | hst=st->hash->init(); | |
234 | st->hash->update(hst,st->buffer.start,st->buffer.size); | |
235 | st->hash->final(hst,hash); | |
236 | sig=st->privkey->sign(st->privkey->st,hash,st->hash->len); | |
237 | buf_append_string(&st->buffer,sig); | |
238 | free(sig); | |
239 | return True; | |
240 | } | |
241 | ||
242 | static bool_t unpick_msg(struct site *st, uint32_t type, | |
243 | struct buffer_if *msg, struct msg *m) | |
244 | { | |
245 | m->hashstart=msg->start; | |
246 | CHECK_AVAIL(msg,4); | |
247 | m->dest=*(uint32_t *)buf_unprepend(msg,4); | |
248 | CHECK_AVAIL(msg,4); | |
249 | m->source=*(uint32_t *)buf_unprepend(msg,4); | |
250 | CHECK_TYPE(msg,type); | |
251 | CHECK_AVAIL(msg,2); | |
252 | m->remlen=ntohs(*(uint16_t *)buf_unprepend(msg,2)); | |
253 | CHECK_AVAIL(msg,m->remlen); | |
254 | m->remote=buf_unprepend(msg,m->remlen); | |
255 | CHECK_AVAIL(msg,2); | |
256 | m->loclen=ntohs(*(uint16_t *)buf_unprepend(msg,2)); | |
257 | CHECK_AVAIL(msg,m->loclen); | |
258 | m->local=buf_unprepend(msg,m->loclen); | |
259 | CHECK_AVAIL(msg,NONCELEN); | |
260 | m->nR=buf_unprepend(msg,NONCELEN); | |
261 | if (type==LABEL_MSG1) { | |
262 | CHECK_EMPTY(msg); | |
263 | return True; | |
264 | } | |
265 | CHECK_AVAIL(msg,NONCELEN); | |
266 | m->nL=buf_unprepend(msg,NONCELEN); | |
267 | if (type==LABEL_MSG2) { | |
268 | CHECK_EMPTY(msg); | |
269 | return True; | |
270 | } | |
271 | CHECK_AVAIL(msg,2); | |
272 | m->pklen=ntohs(*(uint16_t *)buf_unprepend(msg,2)); | |
273 | CHECK_AVAIL(msg,m->pklen); | |
274 | m->pk=buf_unprepend(msg,m->pklen); | |
275 | m->hashlen=msg->start-m->hashstart; | |
276 | CHECK_AVAIL(msg,2); | |
277 | m->siglen=ntohs(*(uint16_t *)buf_unprepend(msg,2)); | |
278 | CHECK_AVAIL(msg,m->siglen); | |
279 | m->sig=buf_unprepend(msg,m->siglen); | |
280 | CHECK_EMPTY(msg); | |
281 | return True; | |
282 | } | |
283 | ||
284 | static bool_t generate_msg1(struct site *st) | |
285 | { | |
286 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
287 | return generate_msg(st,LABEL_MSG1,"site:MSG1"); | |
288 | } | |
289 | ||
290 | static bool_t process_msg1(struct site *st, struct buffer_if *msg1, | |
291 | struct sockaddr_in *src) | |
292 | { | |
293 | struct msg m; | |
294 | ||
295 | /* We've already determined we're in an appropriate state to | |
296 | process an incoming MSG1, and that the MSG1 has correct values | |
297 | of A and B. */ | |
298 | ||
299 | if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False; | |
300 | ||
301 | /* XXX save src as our peer address here? */ | |
302 | st->setup_peer=*src; | |
303 | ||
304 | st->setup_session_id=m.source; | |
305 | memcpy(st->remoteN,m.nR,NONCELEN); | |
306 | return True; | |
307 | } | |
308 | ||
309 | static bool_t generate_msg2(struct site *st) | |
310 | { | |
311 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
312 | return generate_msg(st,LABEL_MSG2,"site:MSG2"); | |
313 | } | |
314 | ||
315 | static bool_t process_msg2(struct site *st, struct buffer_if *msg2, | |
316 | struct sockaddr_in *src) | |
317 | { | |
318 | struct msg m; | |
319 | ||
320 | if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False; | |
321 | ||
322 | /* Check that the site names and our nonce have been sent | |
323 | back correctly, and then store our peer's nonce. */ | |
324 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
325 | slog(st,LOG_SECURITY,"msg2: bad B (remote site name)"); | |
326 | return False; | |
327 | } | |
328 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
329 | slog(st,LOG_SECURITY,"msg2: bad A (local site name)"); | |
330 | return False; | |
331 | } | |
332 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
333 | slog(st,LOG_SECURITY,"msg2: bad nA (locally generated nonce)"); | |
334 | return False; | |
335 | } | |
336 | st->setup_session_id=m.source; | |
337 | memcpy(st->remoteN,m.nR,NONCELEN); | |
338 | return True; | |
339 | } | |
340 | ||
341 | static bool_t generate_msg3(struct site *st) | |
342 | { | |
343 | /* Now we have our nonce and their nonce. Think of a secret key, | |
344 | and create message number 3. */ | |
345 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
346 | return generate_msg(st,LABEL_MSG3,"site:MSG3"); | |
347 | } | |
348 | ||
349 | static bool_t process_msg3(struct site *st, struct buffer_if *msg3, | |
350 | struct sockaddr_in *src) | |
351 | { | |
352 | struct msg m; | |
353 | uint8_t *hash=alloca(st->hash->len); | |
354 | void *hst; | |
355 | ||
356 | if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False; | |
357 | ||
358 | /* Check that the site names and nonces have been sent back | |
359 | correctly */ | |
360 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
361 | slog(st,LOG_SECURITY,"msg3: bad A (remote site name)"); | |
362 | return False; | |
363 | } | |
364 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
365 | slog(st,LOG_SECURITY,"msg3: bad B (local site name)"); | |
366 | return False; | |
367 | } | |
368 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
369 | slog(st,LOG_SECURITY,"msg3: bad nA (remotely generated nonce)"); | |
370 | return False; | |
371 | } | |
372 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
373 | slog(st,LOG_SECURITY,"msg3: bad nB (locally generated nonce)"); | |
374 | return False; | |
375 | } | |
376 | ||
377 | /* Check signature and store g^x mod m */ | |
378 | hst=st->hash->init(); | |
379 | st->hash->update(hst,m.hashstart,m.hashlen); | |
380 | st->hash->final(hst,hash); | |
381 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
382 | m.sig[m.siglen]=0; | |
383 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
384 | slog(st,LOG_SECURITY,"msg3 signature failed check!"); | |
385 | return False; | |
386 | } | |
387 | ||
388 | /* Terminate their DH public key with a '0' */ | |
389 | m.pk[m.pklen]=0; | |
390 | /* Invent our DH secret key */ | |
391 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
392 | ||
393 | /* Generate the shared key */ | |
394 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
395 | st->sharedsecret,st->transform->keylen); | |
396 | ||
397 | /* Set up the transform */ | |
398 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
399 | st->transform->keylen); | |
400 | ||
401 | return True; | |
402 | } | |
403 | ||
404 | static bool_t generate_msg4(struct site *st) | |
405 | { | |
406 | /* We have both nonces, their public key and our private key. Generate | |
407 | our public key, sign it and send it to them. */ | |
408 | return generate_msg(st,LABEL_MSG4,"site:MSG4"); | |
409 | } | |
410 | ||
411 | static bool_t process_msg4(struct site *st, struct buffer_if *msg4, | |
412 | struct sockaddr_in *src) | |
413 | { | |
414 | struct msg m; | |
415 | uint8_t *hash=alloca(st->hash->len); | |
416 | void *hst; | |
417 | ||
418 | if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False; | |
419 | ||
420 | /* Check that the site names and nonces have been sent back | |
421 | correctly */ | |
422 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
423 | slog(st,LOG_SECURITY,"msg4: bad B (remote site name)"); | |
424 | return False; | |
425 | } | |
426 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
427 | slog(st,LOG_SECURITY,"msg4: bad A (local site name)"); | |
428 | return False; | |
429 | } | |
430 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
431 | slog(st,LOG_SECURITY,"msg4: bad nB (remotely generated nonce)"); | |
432 | return False; | |
433 | } | |
434 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
435 | slog(st,LOG_SECURITY,"msg4: bad nA (locally generated nonce)"); | |
436 | return False; | |
437 | } | |
438 | ||
439 | /* Check signature and store g^x mod m */ | |
440 | hst=st->hash->init(); | |
441 | st->hash->update(hst,m.hashstart,m.hashlen); | |
442 | st->hash->final(hst,hash); | |
443 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
444 | m.sig[m.siglen]=0; | |
445 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
446 | slog(st,LOG_SECURITY,"msg4 signature failed check!"); | |
447 | return False; | |
448 | } | |
449 | ||
450 | /* Terminate their DH public key with a '0' */ | |
451 | m.pk[m.pklen]=0; | |
452 | /* Generate the shared key */ | |
453 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
454 | st->sharedsecret,st->transform->keylen); | |
455 | /* Set up the transform */ | |
456 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
457 | st->transform->keylen); | |
458 | ||
459 | return True; | |
460 | } | |
461 | ||
462 | static bool_t generate_msg5(struct site *st) | |
463 | { | |
464 | string_t transform_err; | |
465 | ||
466 | BUF_ALLOC(&st->buffer,"site:MSG5"); | |
467 | /* We are going to add three words to the transformed message */ | |
468 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
469 | *(uint32_t *)buf_append(&st->buffer,4)=LABEL_MSG5; | |
470 | st->new_transform->forwards(st->new_transform->st,&st->buffer, | |
471 | &transform_err); | |
472 | *(uint32_t *)buf_prepend(&st->buffer,4)=LABEL_MSG5; | |
473 | *(uint32_t *)buf_prepend(&st->buffer,4)=(uint32_t)st; | |
474 | *(uint32_t *)buf_prepend(&st->buffer,4)=st->setup_session_id; | |
475 | ||
476 | st->retries=st->setup_retries; | |
477 | return True; | |
478 | } | |
479 | ||
480 | struct msg0 { | |
481 | uint32_t dest; | |
482 | uint32_t source; | |
483 | uint32_t type; | |
484 | }; | |
485 | ||
486 | static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0, | |
487 | struct msg0 *m) | |
488 | { | |
489 | CHECK_AVAIL(msg0,4); | |
490 | m->dest=*(uint32_t *)buf_unprepend(msg0,4); | |
491 | CHECK_AVAIL(msg0,4); | |
492 | m->source=*(uint32_t *)buf_unprepend(msg0,4); | |
493 | CHECK_AVAIL(msg0,4); | |
494 | m->type=*(uint32_t *)buf_unprepend(msg0,4); | |
495 | return True; | |
496 | /* Leaves transformed part of buffer untouched */ | |
497 | } | |
498 | ||
499 | static bool_t process_msg5(struct site *st, struct buffer_if *msg5, | |
500 | struct sockaddr_in *src) | |
501 | { | |
502 | struct msg0 m; | |
503 | string_t transform_err; | |
504 | ||
505 | if (!unpick_msg0(st,msg5,&m)) return False; | |
506 | ||
507 | if (st->new_transform->reverse(st->new_transform->st, | |
508 | msg5,&transform_err)) { | |
509 | /* There's a problem */ | |
510 | slog(st,LOG_SECURITY,"process_msg5: transform: %s",transform_err); | |
511 | return False; | |
512 | } | |
513 | /* Buffer should now contain untransformed PING packet data */ | |
514 | CHECK_AVAIL(msg5,4); | |
515 | if ((*(uint32_t *)buf_unprepend(msg5,4))!=LABEL_MSG5) { | |
516 | slog(st,LOG_SECURITY,"MSG5/PING packet contained invalid data"); | |
517 | return False; | |
518 | } | |
519 | CHECK_EMPTY(msg5); | |
520 | return True; | |
521 | } | |
522 | ||
523 | static bool_t generate_msg6(struct site *st) | |
524 | { | |
525 | string_t transform_err; | |
526 | ||
527 | BUF_ALLOC(&st->buffer,"site:MSG6"); | |
528 | /* We are going to add three words to the transformed message */ | |
529 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
530 | *(uint32_t *)buf_append(&st->buffer,4)=LABEL_MSG6; | |
531 | st->new_transform->forwards(st->new_transform->st,&st->buffer, | |
532 | &transform_err); | |
533 | *(uint32_t *)buf_prepend(&st->buffer,4)=LABEL_MSG6; | |
534 | *(uint32_t *)buf_prepend(&st->buffer,4)=(uint32_t)st; | |
535 | *(uint32_t *)buf_prepend(&st->buffer,4)=st->setup_session_id; | |
536 | ||
537 | st->retries=1; /* Peer will retransmit MSG5 if necessary */ | |
538 | return True; | |
539 | } | |
540 | ||
541 | static bool_t process_msg6(struct site *st, struct buffer_if *msg6, | |
542 | struct sockaddr_in *src) | |
543 | { | |
544 | struct msg0 m; | |
545 | string_t transform_err; | |
546 | ||
547 | if (!unpick_msg0(st,msg6,&m)) return False; | |
548 | ||
549 | if (st->new_transform->reverse(st->new_transform->st, | |
550 | msg6,&transform_err)) { | |
551 | /* There's a problem */ | |
552 | slog(st,LOG_SECURITY,"process_msg6: transform: %s",transform_err); | |
553 | return False; | |
554 | } | |
555 | /* Buffer should now contain untransformed PING packet data */ | |
556 | CHECK_AVAIL(msg6,4); | |
557 | if ((*(uint32_t *)buf_unprepend(msg6,4))!=LABEL_MSG6) { | |
558 | slog(st,LOG_SECURITY,"MSG6/PONG packet contained invalid data"); | |
559 | return False; | |
560 | } | |
561 | CHECK_EMPTY(msg6); | |
562 | return True; | |
563 | } | |
564 | ||
565 | static bool_t process_msg0(struct site *st, struct buffer_if *msg0, | |
566 | struct sockaddr_in *src) | |
567 | { | |
568 | struct msg0 m; | |
569 | string_t transform_err; | |
570 | uint32_t type; | |
571 | ||
572 | if (!st->current_valid) { | |
573 | slog(st,LOG_DROP,"incoming message but no current key -> dropping"); | |
574 | if (st->state==SITE_RUN) { | |
575 | slog(st,LOG_SETUP_INIT|LOG_STATE, | |
576 | "now initiating setup of new key"); | |
577 | return enter_state_resolve(st); | |
578 | } | |
579 | return False; | |
580 | } | |
581 | ||
582 | if (!unpick_msg0(st,msg0,&m)) return False; | |
583 | ||
584 | if (st->current_transform->reverse(st->current_transform->st, | |
585 | msg0,&transform_err)) { | |
586 | /* There's a problem */ | |
587 | slog(st,LOG_SECURITY,"transform: %s",transform_err); | |
588 | return False; | |
589 | } | |
590 | CHECK_AVAIL(msg0,4); | |
591 | type=*(uint32_t *)buf_unprepend(msg0,4); | |
592 | switch(type) { | |
593 | case LABEL_MSG9: | |
594 | /* Deliver to netlink layer */ | |
595 | st->netlink->deliver(st->netlink->st,st->netlink_cid,msg0); | |
596 | return True; | |
597 | break; | |
598 | default: | |
599 | slog(st,LOG_SECURITY,"incoming message of type %08x (unknown)",type); | |
600 | break; | |
601 | } | |
602 | return False; | |
603 | } | |
604 | ||
605 | static void dump_packet(struct site *st, struct buffer_if *buf, | |
606 | struct sockaddr_in *addr, bool_t incoming) | |
607 | { | |
608 | uint32_t dest=*(uint32_t *)buf->start; | |
609 | uint32_t source=*(uint32_t *)(buf->start+4); | |
610 | uint32_t msgtype=*(uint32_t *)(buf->start+8); | |
611 | ||
612 | if (st->log_events & LOG_DUMP) | |
613 | log(st->log,0,"(%s,%s): %s: %08x<-%08x: %08x:", | |
614 | st->localname,st->remotename,incoming?"incoming":"outgoing", | |
615 | dest,source,msgtype); | |
616 | } | |
617 | ||
618 | static uint32_t site_status(void *st) | |
619 | { | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static bool_t send_msg(struct site *st) | |
624 | { | |
625 | if (st->retries>0) { | |
626 | dump_packet(st,&st->buffer,&st->setup_peer,False); | |
627 | st->comm->sendmsg(st->comm->st,&st->buffer,&st->setup_peer); | |
628 | st->timeout=st->now+st->setup_timeout; | |
629 | st->retries--; | |
630 | return True; | |
631 | } else { | |
632 | slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet"); | |
633 | enter_state_wait(st); | |
634 | return False; | |
635 | } | |
636 | } | |
637 | ||
638 | static void site_resolve_callback(void *sst, struct in_addr *address) | |
639 | { | |
640 | struct site *st=sst; | |
641 | ||
642 | if (st->state!=SITE_RESOLVE) { | |
643 | slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly"); | |
644 | return; | |
645 | } | |
646 | if (address) { | |
647 | memset(&st->setup_peer,0,sizeof(st->setup_peer)); | |
648 | st->setup_peer.sin_family=AF_INET; | |
649 | st->setup_peer.sin_port=htons(st->remoteport); | |
650 | st->setup_peer.sin_addr=*address; | |
651 | enter_state_sentmsg1(st); | |
652 | } else { | |
653 | /* Resolution failed */ | |
654 | slog(st,LOG_ERROR,"resolution of %s failed",st->address); | |
655 | enter_state_run(st); | |
656 | } | |
657 | } | |
658 | ||
659 | static void activate_new_key(struct site *st) | |
660 | { | |
661 | struct transform_inst_if *t; | |
662 | ||
663 | t=st->current_transform; | |
664 | st->current_transform=st->new_transform; | |
665 | st->new_transform=t; | |
666 | ||
667 | t->delkey(t->st); | |
668 | st->state=SITE_RUN; | |
669 | st->timeout=0; | |
670 | st->current_valid=True; | |
671 | st->current_key_timeout=st->now+st->key_lifetime; | |
672 | st->peer=st->setup_peer; | |
673 | st->peer_valid=True; | |
674 | st->remote_session_id=st->setup_session_id; | |
675 | ||
676 | slog(st,LOG_ACTIVATE_KEY,"new key activated"); | |
677 | } | |
678 | ||
679 | static void state_assert(struct site *st, bool_t ok) | |
680 | { | |
681 | if (!ok) fatal("state_assert\n"); | |
682 | } | |
683 | ||
684 | static void enter_state_stop(struct site *st) | |
685 | { | |
686 | st->state=SITE_STOP; | |
687 | st->timeout=0; | |
688 | st->current_transform->delkey(st->current_transform->st); | |
689 | st->current_valid=False; | |
690 | st->current_key_timeout=0; | |
691 | ||
692 | st->peer_valid=False; | |
693 | ||
694 | st->new_transform->delkey(st->new_transform->st); | |
695 | } | |
696 | ||
697 | static void enter_state_run(struct site *st) | |
698 | { | |
699 | slog(st,LOG_STATE,"entering state RUN"); | |
700 | st->state=SITE_RUN; | |
701 | st->timeout=0; | |
702 | /* XXX get rid of key setup data */ | |
703 | } | |
704 | ||
705 | static bool_t enter_state_resolve(struct site *st) | |
706 | { | |
707 | state_assert(st,st->state==SITE_RUN); | |
708 | slog(st,LOG_STATE,"entering state RESOLVE"); | |
709 | st->state=SITE_RESOLVE; | |
710 | st->resolver->request(st->resolver->st,st->address, | |
711 | site_resolve_callback,st); | |
712 | return True; | |
713 | } | |
714 | ||
715 | static bool_t enter_state_sentmsg1(struct site *st) | |
716 | { | |
717 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE); | |
718 | slog(st,LOG_STATE,"entering state SENTMSG1"); | |
719 | if (generate_msg1(st) && send_msg(st)) { | |
720 | st->state=SITE_SENTMSG1; | |
721 | return True; | |
722 | } | |
723 | slog(st,LOG_ERROR,"error entering state SENTMSG1"); | |
724 | st->buffer.free=False; /* Can't tell which it was, but enter_state_wait() | |
725 | will do a BUF_FREE() */ | |
726 | enter_state_wait(st); | |
727 | return False; | |
728 | } | |
729 | ||
730 | static bool_t enter_state_sentmsg2(struct site *st) | |
731 | { | |
732 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
733 | st->state==SITE_SENTMSG1 || st->state==SITE_WAIT); | |
734 | slog(st,LOG_STATE,"entering state SENTMSG2"); | |
735 | if (generate_msg2(st) && send_msg(st)) { | |
736 | st->state=SITE_SENTMSG2; | |
737 | return True; | |
738 | } | |
739 | slog(st,LOG_ERROR,"error entering state SENTMSG2"); | |
740 | st->buffer.free=False; | |
741 | enter_state_wait(st); | |
742 | return False; | |
743 | } | |
744 | ||
745 | static bool_t enter_state_sentmsg3(struct site *st) | |
746 | { | |
747 | state_assert(st,st->state==SITE_SENTMSG1); | |
748 | slog(st,LOG_STATE,"entering state SENTMSG3"); | |
749 | BUF_FREE(&st->buffer); /* Free message 1 */ | |
750 | if (generate_msg3(st) && send_msg(st)) { | |
751 | st->state=SITE_SENTMSG3; | |
752 | return True; | |
753 | } | |
754 | slog(st,LOG_ERROR,"error entering state SENTMSG3"); | |
755 | st->buffer.free=False; | |
756 | enter_state_wait(st); | |
757 | return False; | |
758 | } | |
759 | ||
760 | static bool_t enter_state_sentmsg4(struct site *st) | |
761 | { | |
762 | state_assert(st,st->state==SITE_SENTMSG2); | |
763 | slog(st,LOG_STATE,"entering state SENTMSG4"); | |
764 | BUF_FREE(&st->buffer); /* Free message 2 */ | |
765 | if (generate_msg4(st) && send_msg(st)) { | |
766 | st->state=SITE_SENTMSG4; | |
767 | return True; | |
768 | } | |
769 | slog(st,LOG_ERROR,"error entering state SENTMSG4"); | |
770 | st->buffer.free=False; | |
771 | enter_state_wait(st); | |
772 | return False; | |
773 | } | |
774 | ||
775 | static bool_t enter_state_sentmsg5(struct site *st) | |
776 | { | |
777 | state_assert(st,st->state==SITE_SENTMSG3); | |
778 | slog(st,LOG_STATE,"entering state SENTMSG5"); | |
779 | BUF_FREE(&st->buffer); /* Free message 3 */ | |
780 | ||
781 | if (generate_msg5(st) && send_msg(st)) { | |
782 | st->state=SITE_SENTMSG5; | |
783 | return True; | |
784 | } | |
785 | slog(st,LOG_ERROR,"error entering state SENTMSG5"); | |
786 | st->buffer.free=False; | |
787 | enter_state_wait(st); | |
788 | ||
789 | return False; | |
790 | } | |
791 | ||
792 | static bool_t send_msg6(struct site *st) | |
793 | { | |
794 | state_assert(st,st->state==SITE_SENTMSG4); | |
795 | slog(st,LOG_STATE,"entering state RUN after sending msg6"); | |
796 | BUF_FREE(&st->buffer); /* Free message 4 */ | |
797 | if (generate_msg6(st) && send_msg(st)) { | |
798 | BUF_FREE(&st->buffer); /* Never reused */ | |
799 | st->timeout=0; /* Never retransmit */ | |
800 | activate_new_key(st); | |
801 | return True; | |
802 | } | |
803 | slog(st,LOG_ERROR,"error entering state RUN after sending msg6"); | |
804 | st->buffer.free=False; | |
805 | enter_state_wait(st); | |
806 | return False; | |
807 | } | |
808 | ||
809 | /* We go into this state if our peer becomes uncommunicative. Similar to | |
810 | the "stop" state, we forget all session keys for a while, before | |
811 | re-entering the "run" state. */ | |
812 | static void enter_state_wait(struct site *st) | |
813 | { | |
814 | slog(st,LOG_STATE,"entering state WAIT"); | |
815 | st->timeout=st->now+st->wait_timeout; | |
816 | st->state=SITE_WAIT; | |
817 | st->peer_valid=False; | |
818 | BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */ | |
819 | /* XXX Erase keys etc. */ | |
820 | } | |
821 | ||
822 | static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, | |
823 | int *timeout_io, const struct timeval *tv_now, | |
824 | uint64_t *now) | |
825 | { | |
826 | struct site *st=sst; | |
827 | ||
828 | *nfds_io=0; /* We don't use any file descriptors */ | |
829 | st->now=*now; | |
830 | ||
831 | /* Work out when our next timeout is. The earlier of 'timeout' or | |
832 | 'current_key_timeout'. A stored value of '0' indicates no timeout | |
833 | active. */ | |
834 | if (st->timeout && st->timeout-*now < *timeout_io) { | |
835 | *timeout_io=st->timeout-*now; | |
836 | } | |
837 | ||
838 | if (st->current_key_timeout && st->current_key_timeout-*now < *timeout_io) | |
839 | *timeout_io=st->current_key_timeout-*now; | |
840 | ||
841 | return 0; /* success */ | |
842 | } | |
843 | ||
844 | /* NB site_afterpoll will be called before site_beforepoll is ever called */ | |
845 | static void site_afterpoll(void *sst, struct pollfd *fds, int nfds, | |
846 | const struct timeval *tv_now, uint64_t *now) | |
847 | { | |
848 | struct site *st=sst; | |
849 | ||
850 | st->now=*now; | |
851 | if (st->timeout && *now>st->timeout) { | |
852 | /* Do stuff */ | |
853 | st->timeout=0; | |
854 | if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) | |
855 | send_msg(st); | |
856 | else if (st->state==SITE_WAIT) { | |
857 | enter_state_run(st); | |
858 | } else { | |
859 | slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d", | |
860 | st->state); | |
861 | } | |
862 | } | |
863 | if (st->current_key_timeout && *now>st->current_key_timeout) { | |
864 | slog(st,LOG_TIMEOUT_KEY,"maximum key life exceeded; session closed"); | |
865 | st->current_valid=False; | |
866 | st->current_transform->delkey(st->current_transform->st); | |
867 | st->current_key_timeout=0; | |
868 | } | |
869 | } | |
870 | ||
871 | /* This function is called by the netlink device to deliver packets | |
872 | intended for the remote network. The packet is in "raw" wire | |
873 | format, but is guaranteed to be word-aligned. */ | |
874 | static void site_outgoing(void *sst, void *cid, struct buffer_if *buf) | |
875 | { | |
876 | struct site *st=sst; | |
877 | string_t transform_err; | |
878 | ||
879 | if (st->state==SITE_STOP) { | |
880 | BUF_FREE(buf); | |
881 | return; | |
882 | } | |
883 | ||
884 | /* In all other states we consider delivering the packet if we have | |
885 | a valid key and a valid address to send it to. */ | |
886 | if (st->current_valid && st->peer_valid) { | |
887 | /* Transform it and send it */ | |
888 | *(uint32_t *)buf_prepend(buf,4)=LABEL_MSG9; | |
889 | st->current_transform->forwards(st->current_transform->st, | |
890 | buf, &transform_err); | |
891 | *(uint32_t *)buf_prepend(buf,4)=LABEL_MSG0; | |
892 | *(uint32_t *)buf_prepend(buf,4)=(uint32_t)st; | |
893 | *(uint32_t *)buf_prepend(buf,4)=st->remote_session_id; | |
894 | st->comm->sendmsg(st->comm->st,buf,&st->peer); | |
895 | BUF_FREE(buf); | |
896 | return; | |
897 | } | |
898 | ||
899 | if (st->state==SITE_RUN) { | |
900 | BUF_FREE(buf); /* We throw the outgoing packet away */ | |
901 | slog(st,LOG_SETUP_INIT,"initiating key exchange"); | |
902 | enter_state_resolve(st); | |
903 | return; | |
904 | } | |
905 | ||
906 | /* Otherwise we're in the middle of key setup or a wait - just | |
907 | throw the outgoing packet away */ | |
908 | slog(st,LOG_DROP,"discarding outgoing packet"); | |
909 | BUF_FREE(buf); | |
910 | return; | |
911 | } | |
912 | ||
913 | /* This function is called by the communication device to deliver | |
914 | packets from our peers. */ | |
915 | static bool_t site_incoming(void *sst, struct buffer_if *buf, | |
916 | struct sockaddr_in *source) | |
917 | { | |
918 | struct site *st=sst; | |
919 | uint32_t dest=*(uint32_t *)buf->start; | |
920 | ||
921 | if (dest==0) { | |
922 | if (buf->size<(st->setupsiglen+8+NONCELEN)) return False; | |
923 | /* It could be for any site - it should have LABEL_MSG1 and | |
924 | might have our name and our peer's name in it */ | |
925 | if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) { | |
926 | dump_packet(st,buf,source,True); | |
927 | /* It's addressed to us. Decide what to do about it. */ | |
928 | if (st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
929 | st->state==SITE_WAIT) { | |
930 | /* We should definitely process it */ | |
931 | if (process_msg1(st,buf,source)) { | |
932 | slog(st,LOG_SETUP_INIT,"key setup initiated by peer"); | |
933 | enter_state_sentmsg2(st); | |
934 | } else { | |
935 | slog(st,LOG_ERROR,"failed to process incoming msg1"); | |
936 | } | |
937 | BUF_FREE(buf); | |
938 | return True; | |
939 | } | |
940 | if (st->state==SITE_SENTMSG1) { | |
941 | /* We've just sent a message 1! They may have crossed on | |
942 | the wire. If we have priority then we ignore the | |
943 | incoming one, otherwise we process it as usual. */ | |
944 | if (st->setup_priority) { | |
945 | BUF_FREE(buf); | |
946 | slog(st,LOG_DUMP,"crossed msg1s; we are higher " | |
947 | "priority => ignore incoming msg1"); | |
948 | return True; | |
949 | } else { | |
950 | slog(st,LOG_DUMP,"crossed msg1s; we are lower " | |
951 | "priority => use incoming msg1"); | |
952 | if (process_msg1(st,buf,source)) { | |
953 | BUF_FREE(&st->buffer); /* Free our old message 1 */ | |
954 | enter_state_sentmsg2(st); | |
955 | } else { | |
956 | slog(st,LOG_ERROR,"failed to process an incoming " | |
957 | "crossed msg1 (we have low priority)"); | |
958 | } | |
959 | BUF_FREE(buf); | |
960 | return True; | |
961 | } | |
962 | } | |
963 | /* The message 1 was received at an unexpected stage of the | |
964 | key setup. XXX POLICY - what do we do? */ | |
965 | slog(st,LOG_UNEXPECTED,"unexpected incoming message 1"); | |
966 | BUF_FREE(buf); | |
967 | return True; | |
968 | } | |
969 | return False; /* Not for us. */ | |
970 | } | |
971 | if (dest==(uint32_t)st) { | |
972 | uint32_t msgtype=*(uint32_t *)(buf->start+8); | |
973 | /* Explicitly addressed to us */ | |
974 | if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True); | |
975 | switch (msgtype) { | |
976 | case LABEL_MSG0: | |
977 | process_msg0(st,buf,source); | |
978 | break; | |
979 | case LABEL_MSG1: | |
980 | /* Setup packet: should not have been explicitly addressed | |
981 | to us */ | |
982 | slog(st,LOG_SECURITY,"incoming explicitly addressed msg1"); | |
983 | break; | |
984 | case LABEL_MSG2: | |
985 | /* Setup packet: expected only in state SENTMSG1 */ | |
986 | if (st->state!=SITE_SENTMSG1) { | |
987 | slog(st,LOG_UNEXPECTED,"unexpected MSG2"); | |
988 | } else if (process_msg2(st,buf,source)) | |
989 | enter_state_sentmsg3(st); | |
990 | else { | |
991 | slog(st,LOG_SECURITY,"invalid MSG2"); | |
992 | } | |
993 | break; | |
994 | case LABEL_MSG3: | |
995 | /* Setup packet: expected only in state SENTMSG2 */ | |
996 | if (st->state!=SITE_SENTMSG2) { | |
997 | slog(st,LOG_UNEXPECTED,"unexpected MSG3"); | |
998 | } else if (process_msg3(st,buf,source)) | |
999 | enter_state_sentmsg4(st); | |
1000 | else { | |
1001 | slog(st,LOG_SECURITY,"invalid MSG3"); | |
1002 | } | |
1003 | break; | |
1004 | case LABEL_MSG4: | |
1005 | /* Setup packet: expected only in state SENTMSG3 */ | |
1006 | if (st->state!=SITE_SENTMSG3) { | |
1007 | slog(st,LOG_UNEXPECTED,"unexpected MSG4"); | |
1008 | } else if (process_msg4(st,buf,source)) | |
1009 | enter_state_sentmsg5(st); | |
1010 | else { | |
1011 | slog(st,LOG_SECURITY,"invalid MSG4"); | |
1012 | } | |
1013 | break; | |
1014 | case LABEL_MSG5: | |
1015 | /* Setup packet: expected only in state SENTMSG4 or RUN */ | |
1016 | if (st->state!=SITE_SENTMSG4 && st->state!=SITE_RUN) { | |
1017 | slog(st,LOG_UNEXPECTED,"unexpected MSG5"); | |
1018 | } else if (process_msg5(st,buf,source)) { | |
1019 | send_msg6(st); | |
1020 | } else { | |
1021 | slog(st,LOG_SECURITY,"invalid MSG5"); | |
1022 | } | |
1023 | break; | |
1024 | case LABEL_MSG6: | |
1025 | /* Setup packet: expected only in state SENTMSG5 */ | |
1026 | if (st->state!=SITE_SENTMSG5) { | |
1027 | slog(st,LOG_UNEXPECTED,"unexpected MSG6"); | |
1028 | } else if (process_msg6(st,buf,source)) { | |
1029 | BUF_FREE(&st->buffer); /* Free message 5 */ | |
1030 | activate_new_key(st); | |
1031 | } else { | |
1032 | slog(st,LOG_SECURITY,"invalid MSG6"); | |
1033 | } | |
1034 | break; | |
1035 | case LABEL_MSG8: | |
1036 | /* NAK packet: enter state where we ping and check for response */ | |
1037 | slog(st,LOG_ERROR,"received a NAK"); | |
1038 | break; | |
1039 | default: | |
1040 | slog(st,LOG_SECURITY,"received message of unknown type 0x%08x", | |
1041 | msgtype); | |
1042 | break; | |
1043 | } | |
1044 | BUF_FREE(buf); | |
1045 | return True; | |
1046 | } | |
1047 | ||
1048 | return False; | |
1049 | } | |
1050 | ||
1051 | static void site_control(void *vst, bool_t run) | |
1052 | { | |
1053 | struct site *st=vst; | |
1054 | if (run) enter_state_run(st); | |
1055 | else enter_state_stop(st); | |
1056 | } | |
1057 | ||
1058 | static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, | |
1059 | list_t *args) | |
1060 | { | |
1061 | struct site *st; | |
1062 | item_t *item; | |
1063 | dict_t *dict; | |
1064 | ||
1065 | st=safe_malloc(sizeof(*st),"site_apply"); | |
1066 | ||
1067 | st->cl.description="site"; | |
1068 | st->cl.type=CL_SITE; | |
1069 | st->cl.apply=NULL; | |
1070 | st->cl.interface=&st->ops; | |
1071 | st->ops.st=st; | |
1072 | st->ops.control=site_control; | |
1073 | st->ops.status=site_status; | |
1074 | ||
1075 | /* First parameter must be a dict */ | |
1076 | item=list_elem(args,0); | |
1077 | if (!item || item->type!=t_dict) | |
1078 | cfgfatal(loc,"site","parameter must be a dictionary\n"); | |
1079 | ||
1080 | dict=item->data.dict; | |
1081 | st->netlink=find_cl_if(dict,"netlink",CL_NETLINK,True,"site",loc); | |
1082 | st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc); | |
1083 | st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); | |
1084 | st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); | |
1085 | st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc); | |
1086 | ||
1087 | st->localname=dict_read_string(dict, "local-name", True, "site", loc); | |
1088 | st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc); | |
1089 | st->remoteport=dict_read_number(dict,"port",True,"site",loc,0); | |
1090 | ||
1091 | st->remotename=dict_read_string(dict, "name", True, "site", loc); | |
1092 | st->address=dict_read_string(dict, "address", False, "site", loc); | |
1093 | dict_read_subnet_list(dict, "networks", True, "site", loc, | |
1094 | &st->remotenets); | |
1095 | st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); | |
1096 | ||
1097 | st->transform= | |
1098 | find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc); | |
1099 | ||
1100 | st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); | |
1101 | st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); | |
1102 | ||
1103 | st->key_lifetime=dict_read_number(dict,"key-lifetime", | |
1104 | False,"site",loc,DEFAULT_KEY_LIFETIME); | |
1105 | st->setup_retries=dict_read_number(dict,"setup-retries", | |
1106 | False,"site",loc,DEFAULT_SETUP_RETRIES); | |
1107 | st->setup_timeout=dict_read_number(dict,"setup-timeout", | |
1108 | False,"site",loc,DEFAULT_SETUP_TIMEOUT); | |
1109 | st->wait_timeout=dict_read_number(dict,"wait-time", | |
1110 | False,"site",loc,DEFAULT_WAIT_TIME); | |
1111 | /* XXX should be configurable */ | |
1112 | st->log_events=LOG_SECURITY|LOG_ERROR| | |
1113 | LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SETUP_INIT|LOG_SETUP_TIMEOUT; | |
1114 | ||
1115 | /* The information we expect to see in incoming messages of type 1 */ | |
1116 | st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8; | |
1117 | st->setupsig=safe_malloc(st->setupsiglen,"site_apply"); | |
1118 | *(uint32_t *)&(st->setupsig[0])=LABEL_MSG1; | |
1119 | *(uint16_t *)&(st->setupsig[4])=htons(strlen(st->remotename)); | |
1120 | memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename)); | |
1121 | *(uint16_t *)&(st->setupsig[6+strlen(st->remotename)])= | |
1122 | htons(strlen(st->localname)); | |
1123 | memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname, | |
1124 | strlen(st->localname)); | |
1125 | st->setup_priority=(strcmp(st->localname,st->remotename)>0); | |
1126 | ||
1127 | buffer_new(&st->buffer,SETUP_BUFFER_LEN); | |
1128 | ||
1129 | /* We are interested in poll(), but only for timeouts. We don't have | |
1130 | any fds of our own. */ | |
1131 | register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site"); | |
1132 | st->timeout=0; | |
1133 | ||
1134 | st->current_valid=False; | |
1135 | st->current_key_timeout=0; | |
1136 | st->peer_valid=False; | |
1137 | /* XXX mlock these */ | |
1138 | st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); | |
1139 | st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret"); | |
1140 | ||
1141 | /* We need to register the remote networks with the netlink device */ | |
1142 | st->netlink_cid=st->netlink->regnets(st->netlink->st, &st->remotenets, | |
1143 | site_outgoing, st, | |
1144 | st->transform->max_start_pad+(4*4), | |
1145 | st->transform->max_end_pad); | |
1146 | ||
1147 | st->comm->request_notify(st->comm->st, st, site_incoming); | |
1148 | ||
1149 | st->current_transform=st->transform->create(st->transform->st); | |
1150 | st->new_transform=st->transform->create(st->transform->st); | |
1151 | ||
1152 | enter_state_stop(st); | |
1153 | ||
1154 | return new_closure(&st->cl); | |
1155 | } | |
1156 | ||
1157 | init_module site_module; | |
1158 | void site_module(dict_t *dict) | |
1159 | { | |
1160 | add_closure(dict,"site",site_apply); | |
1161 | } |