Commit | Line | Data |
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2fe58dfd SE |
1 | /* site.c - manage communication with a remote network site */ |
2 | ||
8689b3a9 | 3 | #include "secnet.h" |
2fe58dfd | 4 | #include <stdio.h> |
8689b3a9 SE |
5 | /* MBM asserts the next one is needed for compilation under BSD. */ |
6 | #include <sys/socket.h> | |
2fe58dfd | 7 | |
8689b3a9 | 8 | #include <sys/mman.h> |
2fe58dfd | 9 | #include "util.h" |
59635212 | 10 | #include "unaligned.h" |
2fe58dfd SE |
11 | |
12 | #define SETUP_BUFFER_LEN 2048 | |
13 | ||
59635212 | 14 | #define DEFAULT_KEY_LIFETIME 3600000 |
2fe58dfd | 15 | #define DEFAULT_SETUP_RETRIES 5 |
59635212 | 16 | #define DEFAULT_SETUP_TIMEOUT 1000 |
2fe58dfd SE |
17 | #define DEFAULT_WAIT_TIME 10000 |
18 | ||
19 | /* Each site can be in one of several possible states. */ | |
20 | ||
21 | /* States: | |
22 | SITE_STOP - nothing is allowed to happen; tunnel is down; | |
23 | all session keys have been erased | |
24 | -> SITE_RUN upon external instruction | |
25 | SITE_RUN - site up, maybe with valid key | |
26 | -> SITE_RESOLVE upon outgoing packet and no valid key | |
27 | we start name resolution for the other end of the tunnel | |
28 | -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time | |
29 | we send an appropriate message 2 | |
30 | SITE_RESOLVE - waiting for name resolution | |
31 | -> SITE_SENTMSG1 upon successful resolution | |
32 | we send an appropriate message 1 | |
33 | -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution) | |
34 | we abort resolution and | |
35 | -> SITE_WAIT on timeout or resolution failure | |
36 | SITE_SENTMSG1 | |
37 | -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end | |
38 | -> SITE_SENTMSG3 upon valid incoming message 2 | |
39 | -> SITE_WAIT on timeout | |
40 | SITE_SENTMSG2 | |
41 | -> SITE_SENTMSG4 upon valid incoming message 3 | |
42 | -> SITE_WAIT on timeout | |
43 | SITE_SENTMSG3 | |
44 | -> SITE_SENTMSG5 upon valid incoming message 4 | |
45 | -> SITE_WAIT on timeout | |
46 | SITE_SENTMSG4 | |
47 | -> SITE_RUN upon valid incoming message 5 | |
48 | -> SITE_WAIT on timeout | |
49 | SITE_SENTMSG5 | |
50 | -> SITE_RUN upon valid incoming message 6 | |
51 | -> SITE_WAIT on timeout | |
52 | SITE_WAIT - failed to establish key; do nothing for a while | |
53 | -> SITE_RUN on timeout | |
54 | */ | |
55 | ||
56 | #define SITE_STOP 0 | |
57 | #define SITE_RUN 1 | |
58 | #define SITE_RESOLVE 2 | |
59 | #define SITE_SENTMSG1 3 | |
60 | #define SITE_SENTMSG2 4 | |
61 | #define SITE_SENTMSG3 5 | |
62 | #define SITE_SENTMSG4 6 | |
63 | #define SITE_SENTMSG5 7 | |
64 | #define SITE_WAIT 8 | |
65 | ||
8689b3a9 | 66 | #if 0 |
2fe58dfd SE |
67 | static string_t state_name(uint32_t state) |
68 | { | |
69 | switch (state) { | |
70 | case 0: return "SITE_STOP"; | |
71 | case 1: return "SITE_RUN"; | |
72 | case 2: return "SITE_RESOLVE"; | |
73 | case 3: return "SITE_SENTMSG1"; | |
74 | case 4: return "SITE_SENTMSG2"; | |
75 | case 5: return "SITE_SENTMSG3"; | |
76 | case 6: return "SITE_SENTMSG4"; | |
77 | case 7: return "SITE_SENTMSG5"; | |
78 | case 8: return "SITE_WAIT"; | |
79 | default: return "*bad state*"; | |
80 | } | |
81 | } | |
8689b3a9 | 82 | #endif /* 0 */ |
2fe58dfd SE |
83 | |
84 | #define LABEL_MSG0 0x00020200 | |
85 | #define LABEL_MSG1 0x01010101 | |
86 | #define LABEL_MSG2 0x02020202 | |
87 | #define LABEL_MSG3 0x03030303 | |
88 | #define LABEL_MSG4 0x04040404 | |
89 | #define LABEL_MSG5 0x05050505 | |
90 | #define LABEL_MSG6 0x06060606 | |
91 | #define LABEL_MSG7 0x07070707 | |
92 | #define LABEL_MSG8 0x08080808 | |
93 | #define LABEL_MSG9 0x09090909 | |
94 | ||
95 | #define NONCELEN 8 | |
96 | ||
97 | #define LOG_UNEXPECTED 0x00000001 | |
98 | #define LOG_SETUP_INIT 0x00000002 | |
99 | #define LOG_SETUP_TIMEOUT 0x00000004 | |
100 | #define LOG_ACTIVATE_KEY 0x00000008 | |
101 | #define LOG_TIMEOUT_KEY 0x00000010 | |
59635212 | 102 | #define LOG_SEC 0x00000020 |
2fe58dfd SE |
103 | #define LOG_STATE 0x00000040 |
104 | #define LOG_DROP 0x00000080 | |
105 | #define LOG_DUMP 0x00000100 | |
106 | #define LOG_ERROR 0x00000400 | |
107 | ||
108 | struct site { | |
109 | closure_t cl; | |
110 | struct site_if ops; | |
111 | /* configuration information */ | |
112 | string_t localname; | |
113 | string_t remotename; | |
4efd681a | 114 | string_t tunname; /* localname<->remotename by default */ |
2fe58dfd SE |
115 | string_t address; /* DNS name for bootstrapping, optional */ |
116 | int remoteport; | |
117 | struct netlink_if *netlink; | |
118 | struct comm_if *comm; | |
119 | struct resolver_if *resolver; | |
120 | struct log_if *log; | |
121 | struct random_if *random; | |
122 | struct rsaprivkey_if *privkey; | |
123 | struct subnet_list remotenets; | |
124 | struct rsapubkey_if *pubkey; | |
125 | struct transform_if *transform; | |
126 | struct dh_if *dh; | |
127 | struct hash_if *hash; | |
128 | void *netlink_cid; | |
129 | ||
130 | uint32_t setup_retries; /* How many times to send setup packets */ | |
131 | uint32_t setup_timeout; /* Initial timeout for setup packets */ | |
132 | uint32_t wait_timeout; /* How long to wait if setup unsuccessful */ | |
133 | uint32_t key_lifetime; /* How long a key lasts once set up */ | |
134 | ||
135 | uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */ | |
136 | uint32_t setupsiglen; /* Allows us to discard packets quickly if | |
137 | they are not for us */ | |
138 | bool_t setup_priority; /* Do we have precedence if both sites emit | |
139 | message 1 simultaneously? */ | |
140 | uint32_t log_events; | |
141 | ||
142 | /* runtime information */ | |
143 | uint32_t state; | |
144 | uint64_t now; /* Most recently seen time */ | |
145 | ||
146 | uint32_t remote_session_id; | |
147 | struct transform_inst_if *current_transform; | |
148 | bool_t current_valid; | |
149 | uint64_t current_key_timeout; /* End of life of current key */ | |
150 | struct sockaddr_in peer; /* Current address of peer */ | |
151 | bool_t peer_valid; /* Peer address becomes invalid when key times out, | |
152 | but only if we have a DNS name for our peer */ | |
153 | ||
154 | uint32_t setup_session_id; | |
155 | struct sockaddr_in setup_peer; | |
156 | uint8_t localN[NONCELEN]; /* Nonces for key exchange */ | |
157 | uint8_t remoteN[NONCELEN]; | |
158 | struct buffer_if buffer; /* Current outgoing key exchange packet */ | |
159 | uint32_t retries; /* Number of retries remaining */ | |
160 | uint64_t timeout; /* Timeout for current state */ | |
161 | uint8_t *dhsecret; | |
162 | uint8_t *sharedsecret; | |
163 | ||
164 | struct transform_inst_if *new_transform; /* For key setup/verify */ | |
165 | }; | |
166 | ||
167 | static void slog(struct site *st, uint32_t event, string_t msg, ...) | |
168 | { | |
169 | va_list ap; | |
170 | uint8_t buf[240]; | |
171 | ||
172 | va_start(ap,msg); | |
173 | ||
174 | if (event&st->log_events) { | |
175 | vsnprintf(buf,240,msg,ap); | |
4efd681a | 176 | st->log->log(st->log->st,0,"%s: %s",st->tunname,buf); |
2fe58dfd SE |
177 | } |
178 | va_end(ap); | |
179 | } | |
180 | ||
181 | static void enter_state_run(struct site *st); | |
182 | static bool_t enter_state_resolve(struct site *st); | |
183 | static bool_t enter_state_sentmsg1(struct site *st); | |
184 | static bool_t enter_state_sentmsg2(struct site *st); | |
185 | static bool_t enter_state_sentmsg3(struct site *st); | |
186 | static bool_t enter_state_sentmsg4(struct site *st); | |
187 | static bool_t enter_state_sentmsg5(struct site *st); | |
188 | static void enter_state_wait(struct site *st); | |
189 | ||
190 | #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) | |
191 | #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) | |
192 | #define CHECK_TYPE(b,t) do { uint32_t type; \ | |
193 | CHECK_AVAIL((b),4); \ | |
59635212 | 194 | type=buf_unprepend_uint32((b)); \ |
2fe58dfd SE |
195 | if (type!=(t)) return False; } while(0) |
196 | ||
197 | struct msg { | |
198 | uint8_t *hashstart; | |
199 | uint32_t dest; | |
200 | uint32_t source; | |
201 | uint32_t remlen; | |
202 | uint8_t *remote; | |
203 | uint32_t loclen; | |
204 | uint8_t *local; | |
205 | uint8_t *nR; | |
206 | uint8_t *nL; | |
207 | uint32_t pklen; | |
208 | uint8_t *pk; | |
209 | uint32_t hashlen; | |
210 | uint32_t siglen; | |
211 | uint8_t *sig; | |
212 | }; | |
213 | ||
214 | /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside out | |
215 | using a transform. */ | |
216 | static bool_t generate_msg(struct site *st, uint32_t type, string_t what) | |
217 | { | |
218 | void *hst; | |
219 | uint8_t *hash=alloca(st->hash->len); | |
220 | string_t dhpub, sig; | |
221 | ||
222 | st->retries=st->setup_retries; | |
223 | BUF_ALLOC(&st->buffer,what); | |
224 | buffer_init(&st->buffer,0); | |
59635212 SE |
225 | buf_append_uint32(&st->buffer, |
226 | (type==LABEL_MSG1?0:st->setup_session_id)); | |
227 | buf_append_uint32(&st->buffer,(uint32_t)st); | |
228 | buf_append_uint32(&st->buffer,type); | |
2fe58dfd SE |
229 | buf_append_string(&st->buffer,st->localname); |
230 | buf_append_string(&st->buffer,st->remotename); | |
231 | memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN); | |
232 | if (type==LABEL_MSG1) return True; | |
233 | memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN); | |
234 | if (type==LABEL_MSG2) return True; | |
235 | dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); | |
236 | buf_append_string(&st->buffer,dhpub); | |
237 | free(dhpub); | |
238 | hst=st->hash->init(); | |
239 | st->hash->update(hst,st->buffer.start,st->buffer.size); | |
240 | st->hash->final(hst,hash); | |
241 | sig=st->privkey->sign(st->privkey->st,hash,st->hash->len); | |
242 | buf_append_string(&st->buffer,sig); | |
243 | free(sig); | |
244 | return True; | |
245 | } | |
246 | ||
247 | static bool_t unpick_msg(struct site *st, uint32_t type, | |
248 | struct buffer_if *msg, struct msg *m) | |
249 | { | |
250 | m->hashstart=msg->start; | |
251 | CHECK_AVAIL(msg,4); | |
59635212 | 252 | m->dest=buf_unprepend_uint32(msg); |
2fe58dfd | 253 | CHECK_AVAIL(msg,4); |
59635212 | 254 | m->source=buf_unprepend_uint32(msg); |
2fe58dfd SE |
255 | CHECK_TYPE(msg,type); |
256 | CHECK_AVAIL(msg,2); | |
59635212 | 257 | m->remlen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
258 | CHECK_AVAIL(msg,m->remlen); |
259 | m->remote=buf_unprepend(msg,m->remlen); | |
260 | CHECK_AVAIL(msg,2); | |
59635212 | 261 | m->loclen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
262 | CHECK_AVAIL(msg,m->loclen); |
263 | m->local=buf_unprepend(msg,m->loclen); | |
264 | CHECK_AVAIL(msg,NONCELEN); | |
265 | m->nR=buf_unprepend(msg,NONCELEN); | |
266 | if (type==LABEL_MSG1) { | |
267 | CHECK_EMPTY(msg); | |
268 | return True; | |
269 | } | |
270 | CHECK_AVAIL(msg,NONCELEN); | |
271 | m->nL=buf_unprepend(msg,NONCELEN); | |
272 | if (type==LABEL_MSG2) { | |
273 | CHECK_EMPTY(msg); | |
274 | return True; | |
275 | } | |
276 | CHECK_AVAIL(msg,2); | |
59635212 | 277 | m->pklen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
278 | CHECK_AVAIL(msg,m->pklen); |
279 | m->pk=buf_unprepend(msg,m->pklen); | |
280 | m->hashlen=msg->start-m->hashstart; | |
281 | CHECK_AVAIL(msg,2); | |
59635212 | 282 | m->siglen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
283 | CHECK_AVAIL(msg,m->siglen); |
284 | m->sig=buf_unprepend(msg,m->siglen); | |
285 | CHECK_EMPTY(msg); | |
286 | return True; | |
287 | } | |
288 | ||
289 | static bool_t generate_msg1(struct site *st) | |
290 | { | |
291 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
292 | return generate_msg(st,LABEL_MSG1,"site:MSG1"); | |
293 | } | |
294 | ||
295 | static bool_t process_msg1(struct site *st, struct buffer_if *msg1, | |
296 | struct sockaddr_in *src) | |
297 | { | |
298 | struct msg m; | |
299 | ||
300 | /* We've already determined we're in an appropriate state to | |
301 | process an incoming MSG1, and that the MSG1 has correct values | |
302 | of A and B. */ | |
303 | ||
304 | if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False; | |
305 | ||
306 | /* XXX save src as our peer address here? */ | |
307 | st->setup_peer=*src; | |
308 | ||
309 | st->setup_session_id=m.source; | |
310 | memcpy(st->remoteN,m.nR,NONCELEN); | |
311 | return True; | |
312 | } | |
313 | ||
314 | static bool_t generate_msg2(struct site *st) | |
315 | { | |
316 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
317 | return generate_msg(st,LABEL_MSG2,"site:MSG2"); | |
318 | } | |
319 | ||
320 | static bool_t process_msg2(struct site *st, struct buffer_if *msg2, | |
321 | struct sockaddr_in *src) | |
322 | { | |
323 | struct msg m; | |
324 | ||
325 | if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False; | |
326 | ||
327 | /* Check that the site names and our nonce have been sent | |
328 | back correctly, and then store our peer's nonce. */ | |
329 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 330 | slog(st,LOG_SEC,"msg2: bad B (remote site name)"); |
2fe58dfd SE |
331 | return False; |
332 | } | |
333 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 334 | slog(st,LOG_SEC,"msg2: bad A (local site name)"); |
2fe58dfd SE |
335 | return False; |
336 | } | |
337 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 338 | slog(st,LOG_SEC,"msg2: bad nA (locally generated nonce)"); |
2fe58dfd SE |
339 | return False; |
340 | } | |
341 | st->setup_session_id=m.source; | |
342 | memcpy(st->remoteN,m.nR,NONCELEN); | |
343 | return True; | |
344 | } | |
345 | ||
346 | static bool_t generate_msg3(struct site *st) | |
347 | { | |
348 | /* Now we have our nonce and their nonce. Think of a secret key, | |
349 | and create message number 3. */ | |
350 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
351 | return generate_msg(st,LABEL_MSG3,"site:MSG3"); | |
352 | } | |
353 | ||
354 | static bool_t process_msg3(struct site *st, struct buffer_if *msg3, | |
355 | struct sockaddr_in *src) | |
356 | { | |
357 | struct msg m; | |
358 | uint8_t *hash=alloca(st->hash->len); | |
359 | void *hst; | |
360 | ||
361 | if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False; | |
362 | ||
363 | /* Check that the site names and nonces have been sent back | |
364 | correctly */ | |
365 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 366 | slog(st,LOG_SEC,"msg3: bad A (remote site name)"); |
2fe58dfd SE |
367 | return False; |
368 | } | |
369 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 370 | slog(st,LOG_SEC,"msg3: bad B (local site name)"); |
2fe58dfd SE |
371 | return False; |
372 | } | |
373 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
59635212 | 374 | slog(st,LOG_SEC,"msg3: bad nA (remotely generated nonce)"); |
2fe58dfd SE |
375 | return False; |
376 | } | |
377 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 378 | slog(st,LOG_SEC,"msg3: bad nB (locally generated nonce)"); |
2fe58dfd SE |
379 | return False; |
380 | } | |
381 | ||
382 | /* Check signature and store g^x mod m */ | |
383 | hst=st->hash->init(); | |
384 | st->hash->update(hst,m.hashstart,m.hashlen); | |
385 | st->hash->final(hst,hash); | |
386 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
387 | m.sig[m.siglen]=0; | |
388 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
59635212 | 389 | slog(st,LOG_SEC,"msg3 signature failed check!"); |
2fe58dfd SE |
390 | return False; |
391 | } | |
392 | ||
393 | /* Terminate their DH public key with a '0' */ | |
394 | m.pk[m.pklen]=0; | |
395 | /* Invent our DH secret key */ | |
396 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
397 | ||
398 | /* Generate the shared key */ | |
399 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
400 | st->sharedsecret,st->transform->keylen); | |
401 | ||
402 | /* Set up the transform */ | |
403 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
404 | st->transform->keylen); | |
405 | ||
406 | return True; | |
407 | } | |
408 | ||
409 | static bool_t generate_msg4(struct site *st) | |
410 | { | |
411 | /* We have both nonces, their public key and our private key. Generate | |
412 | our public key, sign it and send it to them. */ | |
413 | return generate_msg(st,LABEL_MSG4,"site:MSG4"); | |
414 | } | |
415 | ||
416 | static bool_t process_msg4(struct site *st, struct buffer_if *msg4, | |
417 | struct sockaddr_in *src) | |
418 | { | |
419 | struct msg m; | |
420 | uint8_t *hash=alloca(st->hash->len); | |
421 | void *hst; | |
422 | ||
423 | if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False; | |
424 | ||
425 | /* Check that the site names and nonces have been sent back | |
426 | correctly */ | |
427 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 428 | slog(st,LOG_SEC,"msg4: bad B (remote site name)"); |
2fe58dfd SE |
429 | return False; |
430 | } | |
431 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 432 | slog(st,LOG_SEC,"msg4: bad A (local site name)"); |
2fe58dfd SE |
433 | return False; |
434 | } | |
435 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
59635212 | 436 | slog(st,LOG_SEC,"msg4: bad nB (remotely generated nonce)"); |
2fe58dfd SE |
437 | return False; |
438 | } | |
439 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 440 | slog(st,LOG_SEC,"msg4: bad nA (locally generated nonce)"); |
2fe58dfd SE |
441 | return False; |
442 | } | |
443 | ||
444 | /* Check signature and store g^x mod m */ | |
445 | hst=st->hash->init(); | |
446 | st->hash->update(hst,m.hashstart,m.hashlen); | |
447 | st->hash->final(hst,hash); | |
448 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
449 | m.sig[m.siglen]=0; | |
450 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
59635212 | 451 | slog(st,LOG_SEC,"msg4 signature failed check!"); |
2fe58dfd SE |
452 | return False; |
453 | } | |
454 | ||
455 | /* Terminate their DH public key with a '0' */ | |
456 | m.pk[m.pklen]=0; | |
457 | /* Generate the shared key */ | |
458 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
459 | st->sharedsecret,st->transform->keylen); | |
460 | /* Set up the transform */ | |
461 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
462 | st->transform->keylen); | |
463 | ||
464 | return True; | |
465 | } | |
466 | ||
467 | static bool_t generate_msg5(struct site *st) | |
468 | { | |
469 | string_t transform_err; | |
470 | ||
471 | BUF_ALLOC(&st->buffer,"site:MSG5"); | |
472 | /* We are going to add three words to the transformed message */ | |
473 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
59635212 | 474 | buf_append_uint32(&st->buffer,LABEL_MSG5); |
2fe58dfd SE |
475 | st->new_transform->forwards(st->new_transform->st,&st->buffer, |
476 | &transform_err); | |
59635212 SE |
477 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
478 | buf_prepend_uint32(&st->buffer,(uint32_t)st); | |
479 | buf_prepend_uint32(&st->buffer,st->setup_session_id); | |
2fe58dfd SE |
480 | |
481 | st->retries=st->setup_retries; | |
482 | return True; | |
483 | } | |
484 | ||
485 | struct msg0 { | |
486 | uint32_t dest; | |
487 | uint32_t source; | |
488 | uint32_t type; | |
489 | }; | |
490 | ||
491 | static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0, | |
492 | struct msg0 *m) | |
493 | { | |
494 | CHECK_AVAIL(msg0,4); | |
59635212 | 495 | m->dest=buf_unprepend_uint32(msg0); |
2fe58dfd | 496 | CHECK_AVAIL(msg0,4); |
59635212 | 497 | m->source=buf_unprepend_uint32(msg0); |
2fe58dfd | 498 | CHECK_AVAIL(msg0,4); |
59635212 | 499 | m->type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
500 | return True; |
501 | /* Leaves transformed part of buffer untouched */ | |
502 | } | |
503 | ||
504 | static bool_t process_msg5(struct site *st, struct buffer_if *msg5, | |
505 | struct sockaddr_in *src) | |
506 | { | |
507 | struct msg0 m; | |
508 | string_t transform_err; | |
509 | ||
510 | if (!unpick_msg0(st,msg5,&m)) return False; | |
511 | ||
512 | if (st->new_transform->reverse(st->new_transform->st, | |
513 | msg5,&transform_err)) { | |
514 | /* There's a problem */ | |
59635212 | 515 | slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err); |
2fe58dfd SE |
516 | return False; |
517 | } | |
518 | /* Buffer should now contain untransformed PING packet data */ | |
519 | CHECK_AVAIL(msg5,4); | |
59635212 SE |
520 | if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) { |
521 | slog(st,LOG_SEC,"MSG5/PING packet contained invalid data"); | |
2fe58dfd SE |
522 | return False; |
523 | } | |
524 | CHECK_EMPTY(msg5); | |
525 | return True; | |
526 | } | |
527 | ||
528 | static bool_t generate_msg6(struct site *st) | |
529 | { | |
530 | string_t transform_err; | |
531 | ||
532 | BUF_ALLOC(&st->buffer,"site:MSG6"); | |
533 | /* We are going to add three words to the transformed message */ | |
534 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
59635212 | 535 | buf_append_uint32(&st->buffer,LABEL_MSG6); |
2fe58dfd SE |
536 | st->new_transform->forwards(st->new_transform->st,&st->buffer, |
537 | &transform_err); | |
59635212 SE |
538 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
539 | buf_prepend_uint32(&st->buffer,(uint32_t)st); | |
540 | buf_prepend_uint32(&st->buffer,st->setup_session_id); | |
2fe58dfd SE |
541 | |
542 | st->retries=1; /* Peer will retransmit MSG5 if necessary */ | |
543 | return True; | |
544 | } | |
545 | ||
546 | static bool_t process_msg6(struct site *st, struct buffer_if *msg6, | |
547 | struct sockaddr_in *src) | |
548 | { | |
549 | struct msg0 m; | |
550 | string_t transform_err; | |
551 | ||
552 | if (!unpick_msg0(st,msg6,&m)) return False; | |
553 | ||
554 | if (st->new_transform->reverse(st->new_transform->st, | |
555 | msg6,&transform_err)) { | |
556 | /* There's a problem */ | |
59635212 | 557 | slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err); |
2fe58dfd SE |
558 | return False; |
559 | } | |
560 | /* Buffer should now contain untransformed PING packet data */ | |
561 | CHECK_AVAIL(msg6,4); | |
59635212 SE |
562 | if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) { |
563 | slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data"); | |
2fe58dfd SE |
564 | return False; |
565 | } | |
566 | CHECK_EMPTY(msg6); | |
567 | return True; | |
568 | } | |
569 | ||
570 | static bool_t process_msg0(struct site *st, struct buffer_if *msg0, | |
571 | struct sockaddr_in *src) | |
572 | { | |
573 | struct msg0 m; | |
574 | string_t transform_err; | |
575 | uint32_t type; | |
576 | ||
577 | if (!st->current_valid) { | |
578 | slog(st,LOG_DROP,"incoming message but no current key -> dropping"); | |
579 | if (st->state==SITE_RUN) { | |
580 | slog(st,LOG_SETUP_INIT|LOG_STATE, | |
581 | "now initiating setup of new key"); | |
582 | return enter_state_resolve(st); | |
583 | } | |
584 | return False; | |
585 | } | |
586 | ||
587 | if (!unpick_msg0(st,msg0,&m)) return False; | |
588 | ||
589 | if (st->current_transform->reverse(st->current_transform->st, | |
590 | msg0,&transform_err)) { | |
591 | /* There's a problem */ | |
59635212 | 592 | slog(st,LOG_SEC,"transform: %s",transform_err); |
2fe58dfd SE |
593 | return False; |
594 | } | |
595 | CHECK_AVAIL(msg0,4); | |
59635212 | 596 | type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
597 | switch(type) { |
598 | case LABEL_MSG9: | |
599 | /* Deliver to netlink layer */ | |
600 | st->netlink->deliver(st->netlink->st,st->netlink_cid,msg0); | |
601 | return True; | |
602 | break; | |
603 | default: | |
59635212 | 604 | slog(st,LOG_SEC,"incoming message of type %08x (unknown)",type); |
2fe58dfd SE |
605 | break; |
606 | } | |
607 | return False; | |
608 | } | |
609 | ||
610 | static void dump_packet(struct site *st, struct buffer_if *buf, | |
611 | struct sockaddr_in *addr, bool_t incoming) | |
612 | { | |
59635212 SE |
613 | uint32_t dest=ntohl(*(uint32_t *)buf->start); |
614 | uint32_t source=ntohl(*(uint32_t *)(buf->start+4)); | |
615 | uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8)); | |
2fe58dfd SE |
616 | |
617 | if (st->log_events & LOG_DUMP) | |
618 | log(st->log,0,"(%s,%s): %s: %08x<-%08x: %08x:", | |
619 | st->localname,st->remotename,incoming?"incoming":"outgoing", | |
620 | dest,source,msgtype); | |
621 | } | |
622 | ||
623 | static uint32_t site_status(void *st) | |
624 | { | |
625 | return 0; | |
626 | } | |
627 | ||
628 | static bool_t send_msg(struct site *st) | |
629 | { | |
630 | if (st->retries>0) { | |
631 | dump_packet(st,&st->buffer,&st->setup_peer,False); | |
632 | st->comm->sendmsg(st->comm->st,&st->buffer,&st->setup_peer); | |
633 | st->timeout=st->now+st->setup_timeout; | |
634 | st->retries--; | |
635 | return True; | |
636 | } else { | |
637 | slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet"); | |
638 | enter_state_wait(st); | |
639 | return False; | |
640 | } | |
641 | } | |
642 | ||
643 | static void site_resolve_callback(void *sst, struct in_addr *address) | |
644 | { | |
645 | struct site *st=sst; | |
646 | ||
647 | if (st->state!=SITE_RESOLVE) { | |
648 | slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly"); | |
649 | return; | |
650 | } | |
651 | if (address) { | |
652 | memset(&st->setup_peer,0,sizeof(st->setup_peer)); | |
653 | st->setup_peer.sin_family=AF_INET; | |
654 | st->setup_peer.sin_port=htons(st->remoteport); | |
655 | st->setup_peer.sin_addr=*address; | |
656 | enter_state_sentmsg1(st); | |
657 | } else { | |
658 | /* Resolution failed */ | |
659 | slog(st,LOG_ERROR,"resolution of %s failed",st->address); | |
660 | enter_state_run(st); | |
661 | } | |
662 | } | |
663 | ||
664 | static void activate_new_key(struct site *st) | |
665 | { | |
666 | struct transform_inst_if *t; | |
667 | ||
668 | t=st->current_transform; | |
669 | st->current_transform=st->new_transform; | |
670 | st->new_transform=t; | |
671 | ||
672 | t->delkey(t->st); | |
673 | st->state=SITE_RUN; | |
674 | st->timeout=0; | |
675 | st->current_valid=True; | |
676 | st->current_key_timeout=st->now+st->key_lifetime; | |
677 | st->peer=st->setup_peer; | |
678 | st->peer_valid=True; | |
679 | st->remote_session_id=st->setup_session_id; | |
680 | ||
681 | slog(st,LOG_ACTIVATE_KEY,"new key activated"); | |
682 | } | |
683 | ||
684 | static void state_assert(struct site *st, bool_t ok) | |
685 | { | |
686 | if (!ok) fatal("state_assert\n"); | |
687 | } | |
688 | ||
689 | static void enter_state_stop(struct site *st) | |
690 | { | |
691 | st->state=SITE_STOP; | |
692 | st->timeout=0; | |
693 | st->current_transform->delkey(st->current_transform->st); | |
694 | st->current_valid=False; | |
695 | st->current_key_timeout=0; | |
696 | ||
697 | st->peer_valid=False; | |
698 | ||
699 | st->new_transform->delkey(st->new_transform->st); | |
700 | } | |
701 | ||
702 | static void enter_state_run(struct site *st) | |
703 | { | |
704 | slog(st,LOG_STATE,"entering state RUN"); | |
705 | st->state=SITE_RUN; | |
706 | st->timeout=0; | |
70dc107b | 707 | st->netlink->set_quality(st->netlink->st,st->netlink_cid,LINK_QUALITY_UP); |
2fe58dfd SE |
708 | /* XXX get rid of key setup data */ |
709 | } | |
710 | ||
711 | static bool_t enter_state_resolve(struct site *st) | |
712 | { | |
713 | state_assert(st,st->state==SITE_RUN); | |
714 | slog(st,LOG_STATE,"entering state RESOLVE"); | |
715 | st->state=SITE_RESOLVE; | |
716 | st->resolver->request(st->resolver->st,st->address, | |
717 | site_resolve_callback,st); | |
718 | return True; | |
719 | } | |
720 | ||
721 | static bool_t enter_state_sentmsg1(struct site *st) | |
722 | { | |
723 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE); | |
724 | slog(st,LOG_STATE,"entering state SENTMSG1"); | |
725 | if (generate_msg1(st) && send_msg(st)) { | |
726 | st->state=SITE_SENTMSG1; | |
727 | return True; | |
728 | } | |
729 | slog(st,LOG_ERROR,"error entering state SENTMSG1"); | |
730 | st->buffer.free=False; /* Can't tell which it was, but enter_state_wait() | |
731 | will do a BUF_FREE() */ | |
732 | enter_state_wait(st); | |
733 | return False; | |
734 | } | |
735 | ||
736 | static bool_t enter_state_sentmsg2(struct site *st) | |
737 | { | |
738 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
739 | st->state==SITE_SENTMSG1 || st->state==SITE_WAIT); | |
740 | slog(st,LOG_STATE,"entering state SENTMSG2"); | |
741 | if (generate_msg2(st) && send_msg(st)) { | |
742 | st->state=SITE_SENTMSG2; | |
743 | return True; | |
744 | } | |
745 | slog(st,LOG_ERROR,"error entering state SENTMSG2"); | |
746 | st->buffer.free=False; | |
747 | enter_state_wait(st); | |
748 | return False; | |
749 | } | |
750 | ||
751 | static bool_t enter_state_sentmsg3(struct site *st) | |
752 | { | |
753 | state_assert(st,st->state==SITE_SENTMSG1); | |
754 | slog(st,LOG_STATE,"entering state SENTMSG3"); | |
755 | BUF_FREE(&st->buffer); /* Free message 1 */ | |
756 | if (generate_msg3(st) && send_msg(st)) { | |
757 | st->state=SITE_SENTMSG3; | |
758 | return True; | |
759 | } | |
760 | slog(st,LOG_ERROR,"error entering state SENTMSG3"); | |
761 | st->buffer.free=False; | |
762 | enter_state_wait(st); | |
763 | return False; | |
764 | } | |
765 | ||
766 | static bool_t enter_state_sentmsg4(struct site *st) | |
767 | { | |
768 | state_assert(st,st->state==SITE_SENTMSG2); | |
769 | slog(st,LOG_STATE,"entering state SENTMSG4"); | |
770 | BUF_FREE(&st->buffer); /* Free message 2 */ | |
771 | if (generate_msg4(st) && send_msg(st)) { | |
772 | st->state=SITE_SENTMSG4; | |
773 | return True; | |
774 | } | |
775 | slog(st,LOG_ERROR,"error entering state SENTMSG4"); | |
776 | st->buffer.free=False; | |
777 | enter_state_wait(st); | |
778 | return False; | |
779 | } | |
780 | ||
781 | static bool_t enter_state_sentmsg5(struct site *st) | |
782 | { | |
783 | state_assert(st,st->state==SITE_SENTMSG3); | |
784 | slog(st,LOG_STATE,"entering state SENTMSG5"); | |
785 | BUF_FREE(&st->buffer); /* Free message 3 */ | |
786 | ||
787 | if (generate_msg5(st) && send_msg(st)) { | |
788 | st->state=SITE_SENTMSG5; | |
789 | return True; | |
790 | } | |
791 | slog(st,LOG_ERROR,"error entering state SENTMSG5"); | |
792 | st->buffer.free=False; | |
793 | enter_state_wait(st); | |
794 | ||
795 | return False; | |
796 | } | |
797 | ||
798 | static bool_t send_msg6(struct site *st) | |
799 | { | |
800 | state_assert(st,st->state==SITE_SENTMSG4); | |
801 | slog(st,LOG_STATE,"entering state RUN after sending msg6"); | |
802 | BUF_FREE(&st->buffer); /* Free message 4 */ | |
803 | if (generate_msg6(st) && send_msg(st)) { | |
804 | BUF_FREE(&st->buffer); /* Never reused */ | |
805 | st->timeout=0; /* Never retransmit */ | |
806 | activate_new_key(st); | |
807 | return True; | |
808 | } | |
809 | slog(st,LOG_ERROR,"error entering state RUN after sending msg6"); | |
810 | st->buffer.free=False; | |
811 | enter_state_wait(st); | |
812 | return False; | |
813 | } | |
814 | ||
815 | /* We go into this state if our peer becomes uncommunicative. Similar to | |
816 | the "stop" state, we forget all session keys for a while, before | |
817 | re-entering the "run" state. */ | |
818 | static void enter_state_wait(struct site *st) | |
819 | { | |
820 | slog(st,LOG_STATE,"entering state WAIT"); | |
821 | st->timeout=st->now+st->wait_timeout; | |
822 | st->state=SITE_WAIT; | |
823 | st->peer_valid=False; | |
70dc107b SE |
824 | st->netlink->set_quality(st->netlink->st,st->netlink_cid, |
825 | LINK_QUALITY_DOWN); | |
2fe58dfd SE |
826 | BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */ |
827 | /* XXX Erase keys etc. */ | |
828 | } | |
829 | ||
830 | static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, | |
831 | int *timeout_io, const struct timeval *tv_now, | |
832 | uint64_t *now) | |
833 | { | |
834 | struct site *st=sst; | |
835 | ||
836 | *nfds_io=0; /* We don't use any file descriptors */ | |
837 | st->now=*now; | |
838 | ||
839 | /* Work out when our next timeout is. The earlier of 'timeout' or | |
840 | 'current_key_timeout'. A stored value of '0' indicates no timeout | |
841 | active. */ | |
842 | if (st->timeout && st->timeout-*now < *timeout_io) { | |
843 | *timeout_io=st->timeout-*now; | |
844 | } | |
845 | ||
846 | if (st->current_key_timeout && st->current_key_timeout-*now < *timeout_io) | |
847 | *timeout_io=st->current_key_timeout-*now; | |
848 | ||
849 | return 0; /* success */ | |
850 | } | |
851 | ||
852 | /* NB site_afterpoll will be called before site_beforepoll is ever called */ | |
853 | static void site_afterpoll(void *sst, struct pollfd *fds, int nfds, | |
854 | const struct timeval *tv_now, uint64_t *now) | |
855 | { | |
856 | struct site *st=sst; | |
857 | ||
858 | st->now=*now; | |
859 | if (st->timeout && *now>st->timeout) { | |
860 | /* Do stuff */ | |
861 | st->timeout=0; | |
862 | if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) | |
863 | send_msg(st); | |
864 | else if (st->state==SITE_WAIT) { | |
865 | enter_state_run(st); | |
866 | } else { | |
867 | slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d", | |
868 | st->state); | |
869 | } | |
870 | } | |
871 | if (st->current_key_timeout && *now>st->current_key_timeout) { | |
872 | slog(st,LOG_TIMEOUT_KEY,"maximum key life exceeded; session closed"); | |
873 | st->current_valid=False; | |
874 | st->current_transform->delkey(st->current_transform->st); | |
875 | st->current_key_timeout=0; | |
876 | } | |
877 | } | |
878 | ||
879 | /* This function is called by the netlink device to deliver packets | |
880 | intended for the remote network. The packet is in "raw" wire | |
881 | format, but is guaranteed to be word-aligned. */ | |
882 | static void site_outgoing(void *sst, void *cid, struct buffer_if *buf) | |
883 | { | |
884 | struct site *st=sst; | |
885 | string_t transform_err; | |
886 | ||
887 | if (st->state==SITE_STOP) { | |
888 | BUF_FREE(buf); | |
889 | return; | |
890 | } | |
891 | ||
892 | /* In all other states we consider delivering the packet if we have | |
893 | a valid key and a valid address to send it to. */ | |
894 | if (st->current_valid && st->peer_valid) { | |
895 | /* Transform it and send it */ | |
70dc107b SE |
896 | if (buf->size>0) { |
897 | buf_prepend_uint32(buf,LABEL_MSG9); | |
898 | st->current_transform->forwards(st->current_transform->st, | |
899 | buf, &transform_err); | |
900 | buf_prepend_uint32(buf,LABEL_MSG0); | |
901 | buf_prepend_uint32(buf,(uint32_t)st); | |
902 | buf_prepend_uint32(buf,st->remote_session_id); | |
903 | st->comm->sendmsg(st->comm->st,buf,&st->peer); | |
904 | } | |
2fe58dfd SE |
905 | BUF_FREE(buf); |
906 | return; | |
907 | } | |
908 | ||
909 | if (st->state==SITE_RUN) { | |
910 | BUF_FREE(buf); /* We throw the outgoing packet away */ | |
911 | slog(st,LOG_SETUP_INIT,"initiating key exchange"); | |
912 | enter_state_resolve(st); | |
913 | return; | |
914 | } | |
915 | ||
916 | /* Otherwise we're in the middle of key setup or a wait - just | |
917 | throw the outgoing packet away */ | |
70dc107b | 918 | slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size); |
2fe58dfd SE |
919 | BUF_FREE(buf); |
920 | return; | |
921 | } | |
922 | ||
923 | /* This function is called by the communication device to deliver | |
924 | packets from our peers. */ | |
925 | static bool_t site_incoming(void *sst, struct buffer_if *buf, | |
926 | struct sockaddr_in *source) | |
927 | { | |
928 | struct site *st=sst; | |
59635212 | 929 | uint32_t dest=ntohl(*(uint32_t *)buf->start); |
2fe58dfd SE |
930 | |
931 | if (dest==0) { | |
932 | if (buf->size<(st->setupsiglen+8+NONCELEN)) return False; | |
933 | /* It could be for any site - it should have LABEL_MSG1 and | |
934 | might have our name and our peer's name in it */ | |
935 | if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) { | |
936 | dump_packet(st,buf,source,True); | |
937 | /* It's addressed to us. Decide what to do about it. */ | |
938 | if (st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
939 | st->state==SITE_WAIT) { | |
940 | /* We should definitely process it */ | |
941 | if (process_msg1(st,buf,source)) { | |
942 | slog(st,LOG_SETUP_INIT,"key setup initiated by peer"); | |
943 | enter_state_sentmsg2(st); | |
944 | } else { | |
945 | slog(st,LOG_ERROR,"failed to process incoming msg1"); | |
946 | } | |
947 | BUF_FREE(buf); | |
948 | return True; | |
949 | } | |
950 | if (st->state==SITE_SENTMSG1) { | |
951 | /* We've just sent a message 1! They may have crossed on | |
952 | the wire. If we have priority then we ignore the | |
953 | incoming one, otherwise we process it as usual. */ | |
954 | if (st->setup_priority) { | |
955 | BUF_FREE(buf); | |
956 | slog(st,LOG_DUMP,"crossed msg1s; we are higher " | |
957 | "priority => ignore incoming msg1"); | |
958 | return True; | |
959 | } else { | |
960 | slog(st,LOG_DUMP,"crossed msg1s; we are lower " | |
961 | "priority => use incoming msg1"); | |
962 | if (process_msg1(st,buf,source)) { | |
963 | BUF_FREE(&st->buffer); /* Free our old message 1 */ | |
964 | enter_state_sentmsg2(st); | |
965 | } else { | |
966 | slog(st,LOG_ERROR,"failed to process an incoming " | |
967 | "crossed msg1 (we have low priority)"); | |
968 | } | |
969 | BUF_FREE(buf); | |
970 | return True; | |
971 | } | |
972 | } | |
973 | /* The message 1 was received at an unexpected stage of the | |
974 | key setup. XXX POLICY - what do we do? */ | |
975 | slog(st,LOG_UNEXPECTED,"unexpected incoming message 1"); | |
976 | BUF_FREE(buf); | |
977 | return True; | |
978 | } | |
979 | return False; /* Not for us. */ | |
980 | } | |
981 | if (dest==(uint32_t)st) { | |
59635212 | 982 | uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8)); |
2fe58dfd SE |
983 | /* Explicitly addressed to us */ |
984 | if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True); | |
985 | switch (msgtype) { | |
986 | case LABEL_MSG0: | |
987 | process_msg0(st,buf,source); | |
988 | break; | |
989 | case LABEL_MSG1: | |
990 | /* Setup packet: should not have been explicitly addressed | |
991 | to us */ | |
59635212 | 992 | slog(st,LOG_SEC,"incoming explicitly addressed msg1"); |
2fe58dfd SE |
993 | break; |
994 | case LABEL_MSG2: | |
995 | /* Setup packet: expected only in state SENTMSG1 */ | |
996 | if (st->state!=SITE_SENTMSG1) { | |
997 | slog(st,LOG_UNEXPECTED,"unexpected MSG2"); | |
998 | } else if (process_msg2(st,buf,source)) | |
999 | enter_state_sentmsg3(st); | |
1000 | else { | |
59635212 | 1001 | slog(st,LOG_SEC,"invalid MSG2"); |
2fe58dfd SE |
1002 | } |
1003 | break; | |
1004 | case LABEL_MSG3: | |
1005 | /* Setup packet: expected only in state SENTMSG2 */ | |
1006 | if (st->state!=SITE_SENTMSG2) { | |
1007 | slog(st,LOG_UNEXPECTED,"unexpected MSG3"); | |
1008 | } else if (process_msg3(st,buf,source)) | |
1009 | enter_state_sentmsg4(st); | |
1010 | else { | |
59635212 | 1011 | slog(st,LOG_SEC,"invalid MSG3"); |
2fe58dfd SE |
1012 | } |
1013 | break; | |
1014 | case LABEL_MSG4: | |
1015 | /* Setup packet: expected only in state SENTMSG3 */ | |
1016 | if (st->state!=SITE_SENTMSG3) { | |
1017 | slog(st,LOG_UNEXPECTED,"unexpected MSG4"); | |
1018 | } else if (process_msg4(st,buf,source)) | |
1019 | enter_state_sentmsg5(st); | |
1020 | else { | |
59635212 | 1021 | slog(st,LOG_SEC,"invalid MSG4"); |
2fe58dfd SE |
1022 | } |
1023 | break; | |
1024 | case LABEL_MSG5: | |
4efd681a SE |
1025 | /* Setup packet: expected only in state SENTMSG4 */ |
1026 | /* (may turn up in state RUN if our return MSG6 was lost | |
1027 | and the new key has already been activated. In that | |
1028 | case we should treat it as an ordinary PING packet. We | |
1029 | can't pass it to process_msg5() because the | |
1030 | new_transform will now be null. XXX) */ | |
1031 | if (st->state!=SITE_SENTMSG4) { | |
2fe58dfd SE |
1032 | slog(st,LOG_UNEXPECTED,"unexpected MSG5"); |
1033 | } else if (process_msg5(st,buf,source)) { | |
1034 | send_msg6(st); | |
1035 | } else { | |
59635212 | 1036 | slog(st,LOG_SEC,"invalid MSG5"); |
2fe58dfd SE |
1037 | } |
1038 | break; | |
1039 | case LABEL_MSG6: | |
1040 | /* Setup packet: expected only in state SENTMSG5 */ | |
1041 | if (st->state!=SITE_SENTMSG5) { | |
1042 | slog(st,LOG_UNEXPECTED,"unexpected MSG6"); | |
1043 | } else if (process_msg6(st,buf,source)) { | |
1044 | BUF_FREE(&st->buffer); /* Free message 5 */ | |
1045 | activate_new_key(st); | |
1046 | } else { | |
59635212 | 1047 | slog(st,LOG_SEC,"invalid MSG6"); |
2fe58dfd SE |
1048 | } |
1049 | break; | |
1050 | case LABEL_MSG8: | |
1051 | /* NAK packet: enter state where we ping and check for response */ | |
1052 | slog(st,LOG_ERROR,"received a NAK"); | |
1053 | break; | |
1054 | default: | |
59635212 | 1055 | slog(st,LOG_SEC,"received message of unknown type 0x%08x", |
2fe58dfd SE |
1056 | msgtype); |
1057 | break; | |
1058 | } | |
1059 | BUF_FREE(buf); | |
1060 | return True; | |
1061 | } | |
1062 | ||
1063 | return False; | |
1064 | } | |
1065 | ||
1066 | static void site_control(void *vst, bool_t run) | |
1067 | { | |
1068 | struct site *st=vst; | |
1069 | if (run) enter_state_run(st); | |
1070 | else enter_state_stop(st); | |
1071 | } | |
1072 | ||
1073 | static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, | |
1074 | list_t *args) | |
1075 | { | |
1076 | struct site *st; | |
1077 | item_t *item; | |
1078 | dict_t *dict; | |
1079 | ||
1080 | st=safe_malloc(sizeof(*st),"site_apply"); | |
1081 | ||
1082 | st->cl.description="site"; | |
1083 | st->cl.type=CL_SITE; | |
1084 | st->cl.apply=NULL; | |
1085 | st->cl.interface=&st->ops; | |
1086 | st->ops.st=st; | |
1087 | st->ops.control=site_control; | |
1088 | st->ops.status=site_status; | |
1089 | ||
1090 | /* First parameter must be a dict */ | |
1091 | item=list_elem(args,0); | |
1092 | if (!item || item->type!=t_dict) | |
1093 | cfgfatal(loc,"site","parameter must be a dictionary\n"); | |
1094 | ||
1095 | dict=item->data.dict; | |
558fa3fb SE |
1096 | st->localname=dict_read_string(dict, "local-name", True, "site", loc); |
1097 | st->remotename=dict_read_string(dict, "name", True, "site", loc); | |
1098 | /* Sanity check (which also allows the 'sites' file to include | |
1099 | site() closures for all sites including our own): refuse to | |
1100 | talk to ourselves */ | |
1101 | if (strcmp(st->localname,st->remotename)==0) { | |
baa06aeb SE |
1102 | Message(M_INFO,"site %s: local-name==name -> ignoring this site\n", |
1103 | st->localname); | |
558fa3fb SE |
1104 | free(st); |
1105 | return NULL; | |
1106 | } | |
2fe58dfd SE |
1107 | st->netlink=find_cl_if(dict,"netlink",CL_NETLINK,True,"site",loc); |
1108 | st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc); | |
1109 | st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); | |
1110 | st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); | |
1111 | st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc); | |
1112 | ||
2fe58dfd SE |
1113 | st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc); |
1114 | st->remoteport=dict_read_number(dict,"port",True,"site",loc,0); | |
1115 | ||
2fe58dfd SE |
1116 | st->address=dict_read_string(dict, "address", False, "site", loc); |
1117 | dict_read_subnet_list(dict, "networks", True, "site", loc, | |
1118 | &st->remotenets); | |
1119 | st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); | |
1120 | ||
1121 | st->transform= | |
1122 | find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc); | |
1123 | ||
1124 | st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); | |
1125 | st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); | |
1126 | ||
1127 | st->key_lifetime=dict_read_number(dict,"key-lifetime", | |
1128 | False,"site",loc,DEFAULT_KEY_LIFETIME); | |
1129 | st->setup_retries=dict_read_number(dict,"setup-retries", | |
1130 | False,"site",loc,DEFAULT_SETUP_RETRIES); | |
1131 | st->setup_timeout=dict_read_number(dict,"setup-timeout", | |
1132 | False,"site",loc,DEFAULT_SETUP_TIMEOUT); | |
1133 | st->wait_timeout=dict_read_number(dict,"wait-time", | |
1134 | False,"site",loc,DEFAULT_WAIT_TIME); | |
1135 | /* XXX should be configurable */ | |
59635212 | 1136 | st->log_events=LOG_SEC|LOG_ERROR| |
2fe58dfd SE |
1137 | LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SETUP_INIT|LOG_SETUP_TIMEOUT; |
1138 | ||
4efd681a SE |
1139 | st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5, |
1140 | "site_apply"); | |
1141 | sprintf(st->tunname,"%s<->%s",st->localname,st->remotename); | |
1142 | ||
2fe58dfd | 1143 | /* The information we expect to see in incoming messages of type 1 */ |
59635212 | 1144 | /* XXX fix this bit for unaligned access */ |
2fe58dfd SE |
1145 | st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8; |
1146 | st->setupsig=safe_malloc(st->setupsiglen,"site_apply"); | |
8689b3a9 SE |
1147 | put_uint32(st->setupsig+0,LABEL_MSG1); |
1148 | put_uint16(st->setupsig+4,strlen(st->remotename)); | |
2fe58dfd | 1149 | memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename)); |
8689b3a9 | 1150 | put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname)); |
2fe58dfd SE |
1151 | memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname, |
1152 | strlen(st->localname)); | |
1153 | st->setup_priority=(strcmp(st->localname,st->remotename)>0); | |
1154 | ||
1155 | buffer_new(&st->buffer,SETUP_BUFFER_LEN); | |
1156 | ||
1157 | /* We are interested in poll(), but only for timeouts. We don't have | |
1158 | any fds of our own. */ | |
1159 | register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site"); | |
1160 | st->timeout=0; | |
1161 | ||
1162 | st->current_valid=False; | |
1163 | st->current_key_timeout=0; | |
1164 | st->peer_valid=False; | |
1165 | /* XXX mlock these */ | |
1166 | st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); | |
1167 | st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret"); | |
1168 | ||
1169 | /* We need to register the remote networks with the netlink device */ | |
1170 | st->netlink_cid=st->netlink->regnets(st->netlink->st, &st->remotenets, | |
1171 | site_outgoing, st, | |
1172 | st->transform->max_start_pad+(4*4), | |
4efd681a SE |
1173 | st->transform->max_end_pad, |
1174 | st->tunname); | |
70dc107b SE |
1175 | if (!st->netlink_cid) { |
1176 | fatal("%s: netlink device did not let us register our remote " | |
1177 | "networks. Check that they are not local or excluded.\n", | |
1178 | st->tunname); | |
1179 | } | |
2fe58dfd SE |
1180 | |
1181 | st->comm->request_notify(st->comm->st, st, site_incoming); | |
1182 | ||
1183 | st->current_transform=st->transform->create(st->transform->st); | |
1184 | st->new_transform=st->transform->create(st->transform->st); | |
1185 | ||
1186 | enter_state_stop(st); | |
1187 | ||
1188 | return new_closure(&st->cl); | |
1189 | } | |
1190 | ||
1191 | init_module site_module; | |
1192 | void site_module(dict_t *dict) | |
1193 | { | |
1194 | add_closure(dict,"site",site_apply); | |
1195 | } |