Commit | Line | Data |
---|---|---|
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" |
7138d0c5 | 10 | #include "ipaddr.h" |
59635212 | 11 | #include "unaligned.h" |
2fe58dfd SE |
12 | |
13 | #define SETUP_BUFFER_LEN 2048 | |
14 | ||
9d3a4132 SE |
15 | #define DEFAULT_KEY_LIFETIME 3600000 /* One hour */ |
16 | #define DEFAULT_KEY_RENEGOTIATE_GAP 300000 /* Five minutes */ | |
2fe58dfd | 17 | #define DEFAULT_SETUP_RETRIES 5 |
59635212 | 18 | #define DEFAULT_SETUP_TIMEOUT 1000 |
3454dce4 | 19 | #define DEFAULT_WAIT_TIME 20000 |
2fe58dfd SE |
20 | |
21 | /* Each site can be in one of several possible states. */ | |
22 | ||
23 | /* States: | |
24 | SITE_STOP - nothing is allowed to happen; tunnel is down; | |
25 | all session keys have been erased | |
26 | -> SITE_RUN upon external instruction | |
27 | SITE_RUN - site up, maybe with valid key | |
28 | -> SITE_RESOLVE upon outgoing packet and no valid key | |
29 | we start name resolution for the other end of the tunnel | |
30 | -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time | |
31 | we send an appropriate message 2 | |
32 | SITE_RESOLVE - waiting for name resolution | |
33 | -> SITE_SENTMSG1 upon successful resolution | |
34 | we send an appropriate message 1 | |
35 | -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution) | |
36 | we abort resolution and | |
37 | -> SITE_WAIT on timeout or resolution failure | |
38 | SITE_SENTMSG1 | |
39 | -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end | |
40 | -> SITE_SENTMSG3 upon valid incoming message 2 | |
41 | -> SITE_WAIT on timeout | |
42 | SITE_SENTMSG2 | |
43 | -> SITE_SENTMSG4 upon valid incoming message 3 | |
44 | -> SITE_WAIT on timeout | |
45 | SITE_SENTMSG3 | |
46 | -> SITE_SENTMSG5 upon valid incoming message 4 | |
47 | -> SITE_WAIT on timeout | |
48 | SITE_SENTMSG4 | |
49 | -> SITE_RUN upon valid incoming message 5 | |
50 | -> SITE_WAIT on timeout | |
51 | SITE_SENTMSG5 | |
52 | -> SITE_RUN upon valid incoming message 6 | |
53 | -> SITE_WAIT on timeout | |
54 | SITE_WAIT - failed to establish key; do nothing for a while | |
55 | -> SITE_RUN on timeout | |
56 | */ | |
57 | ||
58 | #define SITE_STOP 0 | |
59 | #define SITE_RUN 1 | |
60 | #define SITE_RESOLVE 2 | |
61 | #define SITE_SENTMSG1 3 | |
62 | #define SITE_SENTMSG2 4 | |
63 | #define SITE_SENTMSG3 5 | |
64 | #define SITE_SENTMSG4 6 | |
65 | #define SITE_SENTMSG5 7 | |
66 | #define SITE_WAIT 8 | |
67 | ||
68 | static string_t state_name(uint32_t state) | |
69 | { | |
70 | switch (state) { | |
3454dce4 SE |
71 | case 0: return "STOP"; |
72 | case 1: return "RUN"; | |
73 | case 2: return "RESOLVE"; | |
74 | case 3: return "SENTMSG1"; | |
75 | case 4: return "SENTMSG2"; | |
76 | case 5: return "SENTMSG3"; | |
77 | case 6: return "SENTMSG4"; | |
78 | case 7: return "SENTMSG5"; | |
79 | case 8: return "WAIT"; | |
2fe58dfd SE |
80 | default: return "*bad state*"; |
81 | } | |
82 | } | |
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 | |
9d3a4132 | 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 | ||
9d3a4132 SE |
108 | static struct flagstr log_event_table[]={ |
109 | { "unexpected", LOG_UNEXPECTED }, | |
110 | { "setup-init", LOG_SETUP_INIT }, | |
111 | { "setup-timeout", LOG_SETUP_TIMEOUT }, | |
112 | { "activate-key", LOG_ACTIVATE_KEY }, | |
113 | { "timeout-key", LOG_TIMEOUT_KEY }, | |
114 | { "security", LOG_SEC }, | |
115 | { "state-change", LOG_STATE }, | |
116 | { "packet-drop", LOG_DROP }, | |
117 | { "dump-packets", LOG_DUMP }, | |
118 | { "errors", LOG_ERROR }, | |
119 | { "all", 0xffffffff }, | |
120 | { NULL, 0 } | |
121 | }; | |
122 | ||
3454dce4 SE |
123 | static struct flagstr netlink_option_table[]={ |
124 | { "soft", NETLINK_OPTION_SOFTROUTE }, | |
125 | { "allow-route", NETLINK_OPTION_ALLOW_ROUTE }, | |
126 | { NULL, 0} | |
127 | }; | |
128 | ||
2fe58dfd SE |
129 | struct site { |
130 | closure_t cl; | |
131 | struct site_if ops; | |
132 | /* configuration information */ | |
133 | string_t localname; | |
134 | string_t remotename; | |
4efd681a | 135 | string_t tunname; /* localname<->remotename by default */ |
2fe58dfd SE |
136 | string_t address; /* DNS name for bootstrapping, optional */ |
137 | int remoteport; | |
138 | struct netlink_if *netlink; | |
139 | struct comm_if *comm; | |
140 | struct resolver_if *resolver; | |
141 | struct log_if *log; | |
142 | struct random_if *random; | |
143 | struct rsaprivkey_if *privkey; | |
144 | struct subnet_list remotenets; | |
145 | struct rsapubkey_if *pubkey; | |
146 | struct transform_if *transform; | |
147 | struct dh_if *dh; | |
148 | struct hash_if *hash; | |
2fe58dfd SE |
149 | |
150 | uint32_t setup_retries; /* How many times to send setup packets */ | |
151 | uint32_t setup_timeout; /* Initial timeout for setup packets */ | |
152 | uint32_t wait_timeout; /* How long to wait if setup unsuccessful */ | |
153 | uint32_t key_lifetime; /* How long a key lasts once set up */ | |
9d3a4132 SE |
154 | uint32_t key_renegotiate_time; /* If we see traffic (or a keepalive) |
155 | after this time, initiate a new | |
156 | key exchange */ | |
157 | ||
158 | bool_t keepalive; /* Always keep the tunnel up */ | |
2fe58dfd SE |
159 | |
160 | uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */ | |
161 | uint32_t setupsiglen; /* Allows us to discard packets quickly if | |
162 | they are not for us */ | |
163 | bool_t setup_priority; /* Do we have precedence if both sites emit | |
164 | message 1 simultaneously? */ | |
165 | uint32_t log_events; | |
166 | ||
167 | /* runtime information */ | |
168 | uint32_t state; | |
169 | uint64_t now; /* Most recently seen time */ | |
170 | ||
9d3a4132 SE |
171 | void *netlink_cid; |
172 | ||
2fe58dfd SE |
173 | uint32_t remote_session_id; |
174 | struct transform_inst_if *current_transform; | |
175 | bool_t current_valid; | |
176 | uint64_t current_key_timeout; /* End of life of current key */ | |
177 | struct sockaddr_in peer; /* Current address of peer */ | |
178 | bool_t peer_valid; /* Peer address becomes invalid when key times out, | |
179 | but only if we have a DNS name for our peer */ | |
180 | ||
181 | uint32_t setup_session_id; | |
182 | struct sockaddr_in setup_peer; | |
183 | uint8_t localN[NONCELEN]; /* Nonces for key exchange */ | |
184 | uint8_t remoteN[NONCELEN]; | |
185 | struct buffer_if buffer; /* Current outgoing key exchange packet */ | |
186 | uint32_t retries; /* Number of retries remaining */ | |
187 | uint64_t timeout; /* Timeout for current state */ | |
188 | uint8_t *dhsecret; | |
189 | uint8_t *sharedsecret; | |
190 | ||
191 | struct transform_inst_if *new_transform; /* For key setup/verify */ | |
192 | }; | |
193 | ||
194 | static void slog(struct site *st, uint32_t event, string_t msg, ...) | |
195 | { | |
196 | va_list ap; | |
197 | uint8_t buf[240]; | |
b2a56f7c | 198 | uint32_t class; |
2fe58dfd SE |
199 | |
200 | va_start(ap,msg); | |
201 | ||
202 | if (event&st->log_events) { | |
b2a56f7c SE |
203 | switch(event) { |
204 | case LOG_UNEXPECTED: class=M_INFO; break; | |
205 | case LOG_SETUP_INIT: class=M_INFO; break; | |
206 | case LOG_SETUP_TIMEOUT: class=M_NOTICE; break; | |
207 | case LOG_ACTIVATE_KEY: class=M_INFO; break; | |
208 | case LOG_TIMEOUT_KEY: class=M_INFO; break; | |
209 | case LOG_SEC: class=M_SECURITY; break; | |
210 | case LOG_STATE: class=M_DEBUG; break; | |
211 | case LOG_DROP: class=M_DEBUG; break; | |
212 | case LOG_DUMP: class=M_DEBUG; break; | |
213 | case LOG_ERROR: class=M_ERROR; break; | |
214 | default: class=M_ERROR; break; | |
215 | } | |
216 | ||
2fe58dfd | 217 | vsnprintf(buf,240,msg,ap); |
b2a56f7c | 218 | st->log->log(st->log->st,class,"%s: %s",st->tunname,buf); |
2fe58dfd SE |
219 | } |
220 | va_end(ap); | |
221 | } | |
222 | ||
9d3a4132 SE |
223 | static void set_link_quality(struct site *st); |
224 | static bool_t initiate_key_setup(struct site *st); | |
2fe58dfd SE |
225 | static void enter_state_run(struct site *st); |
226 | static bool_t enter_state_resolve(struct site *st); | |
227 | static bool_t enter_state_sentmsg1(struct site *st); | |
228 | static bool_t enter_state_sentmsg2(struct site *st); | |
229 | static bool_t enter_state_sentmsg3(struct site *st); | |
230 | static bool_t enter_state_sentmsg4(struct site *st); | |
231 | static bool_t enter_state_sentmsg5(struct site *st); | |
232 | static void enter_state_wait(struct site *st); | |
233 | ||
234 | #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) | |
235 | #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) | |
236 | #define CHECK_TYPE(b,t) do { uint32_t type; \ | |
237 | CHECK_AVAIL((b),4); \ | |
59635212 | 238 | type=buf_unprepend_uint32((b)); \ |
2fe58dfd SE |
239 | if (type!=(t)) return False; } while(0) |
240 | ||
241 | struct msg { | |
242 | uint8_t *hashstart; | |
243 | uint32_t dest; | |
244 | uint32_t source; | |
245 | uint32_t remlen; | |
246 | uint8_t *remote; | |
247 | uint32_t loclen; | |
248 | uint8_t *local; | |
249 | uint8_t *nR; | |
250 | uint8_t *nL; | |
251 | uint32_t pklen; | |
252 | uint8_t *pk; | |
253 | uint32_t hashlen; | |
254 | uint32_t siglen; | |
255 | uint8_t *sig; | |
256 | }; | |
257 | ||
258 | /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside out | |
259 | using a transform. */ | |
260 | static bool_t generate_msg(struct site *st, uint32_t type, string_t what) | |
261 | { | |
262 | void *hst; | |
263 | uint8_t *hash=alloca(st->hash->len); | |
264 | string_t dhpub, sig; | |
265 | ||
266 | st->retries=st->setup_retries; | |
267 | BUF_ALLOC(&st->buffer,what); | |
268 | buffer_init(&st->buffer,0); | |
59635212 SE |
269 | buf_append_uint32(&st->buffer, |
270 | (type==LABEL_MSG1?0:st->setup_session_id)); | |
271 | buf_append_uint32(&st->buffer,(uint32_t)st); | |
272 | buf_append_uint32(&st->buffer,type); | |
2fe58dfd SE |
273 | buf_append_string(&st->buffer,st->localname); |
274 | buf_append_string(&st->buffer,st->remotename); | |
275 | memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN); | |
276 | if (type==LABEL_MSG1) return True; | |
277 | memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN); | |
278 | if (type==LABEL_MSG2) return True; | |
279 | dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); | |
280 | buf_append_string(&st->buffer,dhpub); | |
281 | free(dhpub); | |
282 | hst=st->hash->init(); | |
283 | st->hash->update(hst,st->buffer.start,st->buffer.size); | |
284 | st->hash->final(hst,hash); | |
285 | sig=st->privkey->sign(st->privkey->st,hash,st->hash->len); | |
286 | buf_append_string(&st->buffer,sig); | |
287 | free(sig); | |
288 | return True; | |
289 | } | |
290 | ||
291 | static bool_t unpick_msg(struct site *st, uint32_t type, | |
292 | struct buffer_if *msg, struct msg *m) | |
293 | { | |
294 | m->hashstart=msg->start; | |
295 | CHECK_AVAIL(msg,4); | |
59635212 | 296 | m->dest=buf_unprepend_uint32(msg); |
2fe58dfd | 297 | CHECK_AVAIL(msg,4); |
59635212 | 298 | m->source=buf_unprepend_uint32(msg); |
2fe58dfd SE |
299 | CHECK_TYPE(msg,type); |
300 | CHECK_AVAIL(msg,2); | |
59635212 | 301 | m->remlen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
302 | CHECK_AVAIL(msg,m->remlen); |
303 | m->remote=buf_unprepend(msg,m->remlen); | |
304 | CHECK_AVAIL(msg,2); | |
59635212 | 305 | m->loclen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
306 | CHECK_AVAIL(msg,m->loclen); |
307 | m->local=buf_unprepend(msg,m->loclen); | |
308 | CHECK_AVAIL(msg,NONCELEN); | |
309 | m->nR=buf_unprepend(msg,NONCELEN); | |
310 | if (type==LABEL_MSG1) { | |
311 | CHECK_EMPTY(msg); | |
312 | return True; | |
313 | } | |
314 | CHECK_AVAIL(msg,NONCELEN); | |
315 | m->nL=buf_unprepend(msg,NONCELEN); | |
316 | if (type==LABEL_MSG2) { | |
317 | CHECK_EMPTY(msg); | |
318 | return True; | |
319 | } | |
320 | CHECK_AVAIL(msg,2); | |
59635212 | 321 | m->pklen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
322 | CHECK_AVAIL(msg,m->pklen); |
323 | m->pk=buf_unprepend(msg,m->pklen); | |
324 | m->hashlen=msg->start-m->hashstart; | |
325 | CHECK_AVAIL(msg,2); | |
59635212 | 326 | m->siglen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
327 | CHECK_AVAIL(msg,m->siglen); |
328 | m->sig=buf_unprepend(msg,m->siglen); | |
329 | CHECK_EMPTY(msg); | |
330 | return True; | |
331 | } | |
332 | ||
333 | static bool_t generate_msg1(struct site *st) | |
334 | { | |
335 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
336 | return generate_msg(st,LABEL_MSG1,"site:MSG1"); | |
337 | } | |
338 | ||
339 | static bool_t process_msg1(struct site *st, struct buffer_if *msg1, | |
340 | struct sockaddr_in *src) | |
341 | { | |
342 | struct msg m; | |
343 | ||
344 | /* We've already determined we're in an appropriate state to | |
345 | process an incoming MSG1, and that the MSG1 has correct values | |
346 | of A and B. */ | |
347 | ||
348 | if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False; | |
349 | ||
350 | /* XXX save src as our peer address here? */ | |
351 | st->setup_peer=*src; | |
352 | ||
353 | st->setup_session_id=m.source; | |
354 | memcpy(st->remoteN,m.nR,NONCELEN); | |
355 | return True; | |
356 | } | |
357 | ||
358 | static bool_t generate_msg2(struct site *st) | |
359 | { | |
360 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
361 | return generate_msg(st,LABEL_MSG2,"site:MSG2"); | |
362 | } | |
363 | ||
364 | static bool_t process_msg2(struct site *st, struct buffer_if *msg2, | |
365 | struct sockaddr_in *src) | |
366 | { | |
367 | struct msg m; | |
368 | ||
369 | if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False; | |
370 | ||
371 | /* Check that the site names and our nonce have been sent | |
372 | back correctly, and then store our peer's nonce. */ | |
373 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 374 | slog(st,LOG_SEC,"msg2: bad B (remote site name)"); |
2fe58dfd SE |
375 | return False; |
376 | } | |
377 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 378 | slog(st,LOG_SEC,"msg2: bad A (local site name)"); |
2fe58dfd SE |
379 | return False; |
380 | } | |
381 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 382 | slog(st,LOG_SEC,"msg2: bad nA (locally generated nonce)"); |
2fe58dfd SE |
383 | return False; |
384 | } | |
385 | st->setup_session_id=m.source; | |
386 | memcpy(st->remoteN,m.nR,NONCELEN); | |
387 | return True; | |
388 | } | |
389 | ||
390 | static bool_t generate_msg3(struct site *st) | |
391 | { | |
392 | /* Now we have our nonce and their nonce. Think of a secret key, | |
393 | and create message number 3. */ | |
394 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
395 | return generate_msg(st,LABEL_MSG3,"site:MSG3"); | |
396 | } | |
397 | ||
398 | static bool_t process_msg3(struct site *st, struct buffer_if *msg3, | |
399 | struct sockaddr_in *src) | |
400 | { | |
401 | struct msg m; | |
402 | uint8_t *hash=alloca(st->hash->len); | |
403 | void *hst; | |
404 | ||
405 | if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False; | |
406 | ||
407 | /* Check that the site names and nonces have been sent back | |
408 | correctly */ | |
409 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 410 | slog(st,LOG_SEC,"msg3: bad A (remote site name)"); |
2fe58dfd SE |
411 | return False; |
412 | } | |
413 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 414 | slog(st,LOG_SEC,"msg3: bad B (local site name)"); |
2fe58dfd SE |
415 | return False; |
416 | } | |
417 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
59635212 | 418 | slog(st,LOG_SEC,"msg3: bad nA (remotely generated nonce)"); |
2fe58dfd SE |
419 | return False; |
420 | } | |
421 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 422 | slog(st,LOG_SEC,"msg3: bad nB (locally generated nonce)"); |
2fe58dfd SE |
423 | return False; |
424 | } | |
425 | ||
426 | /* Check signature and store g^x mod m */ | |
427 | hst=st->hash->init(); | |
428 | st->hash->update(hst,m.hashstart,m.hashlen); | |
429 | st->hash->final(hst,hash); | |
430 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
431 | m.sig[m.siglen]=0; | |
432 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
59635212 | 433 | slog(st,LOG_SEC,"msg3 signature failed check!"); |
2fe58dfd SE |
434 | return False; |
435 | } | |
436 | ||
437 | /* Terminate their DH public key with a '0' */ | |
438 | m.pk[m.pklen]=0; | |
439 | /* Invent our DH secret key */ | |
440 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
441 | ||
442 | /* Generate the shared key */ | |
443 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
444 | st->sharedsecret,st->transform->keylen); | |
445 | ||
446 | /* Set up the transform */ | |
447 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
448 | st->transform->keylen); | |
449 | ||
450 | return True; | |
451 | } | |
452 | ||
453 | static bool_t generate_msg4(struct site *st) | |
454 | { | |
455 | /* We have both nonces, their public key and our private key. Generate | |
456 | our public key, sign it and send it to them. */ | |
457 | return generate_msg(st,LABEL_MSG4,"site:MSG4"); | |
458 | } | |
459 | ||
460 | static bool_t process_msg4(struct site *st, struct buffer_if *msg4, | |
461 | struct sockaddr_in *src) | |
462 | { | |
463 | struct msg m; | |
464 | uint8_t *hash=alloca(st->hash->len); | |
465 | void *hst; | |
466 | ||
467 | if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False; | |
468 | ||
469 | /* Check that the site names and nonces have been sent back | |
470 | correctly */ | |
471 | if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) { | |
59635212 | 472 | slog(st,LOG_SEC,"msg4: bad B (remote site name)"); |
2fe58dfd SE |
473 | return False; |
474 | } | |
475 | if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) { | |
59635212 | 476 | slog(st,LOG_SEC,"msg4: bad A (local site name)"); |
2fe58dfd SE |
477 | return False; |
478 | } | |
479 | if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) { | |
59635212 | 480 | slog(st,LOG_SEC,"msg4: bad nB (remotely generated nonce)"); |
2fe58dfd SE |
481 | return False; |
482 | } | |
483 | if (memcmp(m.nL,st->localN,NONCELEN)!=0) { | |
59635212 | 484 | slog(st,LOG_SEC,"msg4: bad nA (locally generated nonce)"); |
2fe58dfd SE |
485 | return False; |
486 | } | |
487 | ||
488 | /* Check signature and store g^x mod m */ | |
489 | hst=st->hash->init(); | |
490 | st->hash->update(hst,m.hashstart,m.hashlen); | |
491 | st->hash->final(hst,hash); | |
492 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
493 | m.sig[m.siglen]=0; | |
494 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) { | |
59635212 | 495 | slog(st,LOG_SEC,"msg4 signature failed check!"); |
2fe58dfd SE |
496 | return False; |
497 | } | |
498 | ||
499 | /* Terminate their DH public key with a '0' */ | |
500 | m.pk[m.pklen]=0; | |
501 | /* Generate the shared key */ | |
502 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk, | |
503 | st->sharedsecret,st->transform->keylen); | |
504 | /* Set up the transform */ | |
505 | st->new_transform->setkey(st->new_transform->st,st->sharedsecret, | |
506 | st->transform->keylen); | |
507 | ||
508 | return True; | |
509 | } | |
510 | ||
511 | static bool_t generate_msg5(struct site *st) | |
512 | { | |
513 | string_t transform_err; | |
514 | ||
515 | BUF_ALLOC(&st->buffer,"site:MSG5"); | |
516 | /* We are going to add three words to the transformed message */ | |
517 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
59635212 | 518 | buf_append_uint32(&st->buffer,LABEL_MSG5); |
2fe58dfd SE |
519 | st->new_transform->forwards(st->new_transform->st,&st->buffer, |
520 | &transform_err); | |
59635212 SE |
521 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
522 | buf_prepend_uint32(&st->buffer,(uint32_t)st); | |
523 | buf_prepend_uint32(&st->buffer,st->setup_session_id); | |
2fe58dfd SE |
524 | |
525 | st->retries=st->setup_retries; | |
526 | return True; | |
527 | } | |
528 | ||
529 | struct msg0 { | |
530 | uint32_t dest; | |
531 | uint32_t source; | |
532 | uint32_t type; | |
533 | }; | |
534 | ||
535 | static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0, | |
536 | struct msg0 *m) | |
537 | { | |
538 | CHECK_AVAIL(msg0,4); | |
59635212 | 539 | m->dest=buf_unprepend_uint32(msg0); |
2fe58dfd | 540 | CHECK_AVAIL(msg0,4); |
59635212 | 541 | m->source=buf_unprepend_uint32(msg0); |
2fe58dfd | 542 | CHECK_AVAIL(msg0,4); |
59635212 | 543 | m->type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
544 | return True; |
545 | /* Leaves transformed part of buffer untouched */ | |
546 | } | |
547 | ||
548 | static bool_t process_msg5(struct site *st, struct buffer_if *msg5, | |
549 | struct sockaddr_in *src) | |
550 | { | |
551 | struct msg0 m; | |
552 | string_t transform_err; | |
553 | ||
554 | if (!unpick_msg0(st,msg5,&m)) return False; | |
555 | ||
556 | if (st->new_transform->reverse(st->new_transform->st, | |
557 | msg5,&transform_err)) { | |
558 | /* There's a problem */ | |
59635212 | 559 | slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err); |
2fe58dfd SE |
560 | return False; |
561 | } | |
562 | /* Buffer should now contain untransformed PING packet data */ | |
563 | CHECK_AVAIL(msg5,4); | |
59635212 SE |
564 | if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) { |
565 | slog(st,LOG_SEC,"MSG5/PING packet contained invalid data"); | |
2fe58dfd SE |
566 | return False; |
567 | } | |
568 | CHECK_EMPTY(msg5); | |
569 | return True; | |
570 | } | |
571 | ||
572 | static bool_t generate_msg6(struct site *st) | |
573 | { | |
574 | string_t transform_err; | |
575 | ||
576 | BUF_ALLOC(&st->buffer,"site:MSG6"); | |
577 | /* We are going to add three words to the transformed message */ | |
578 | buffer_init(&st->buffer,st->transform->max_start_pad+(4*3)); | |
59635212 | 579 | buf_append_uint32(&st->buffer,LABEL_MSG6); |
2fe58dfd SE |
580 | st->new_transform->forwards(st->new_transform->st,&st->buffer, |
581 | &transform_err); | |
59635212 SE |
582 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
583 | buf_prepend_uint32(&st->buffer,(uint32_t)st); | |
584 | buf_prepend_uint32(&st->buffer,st->setup_session_id); | |
2fe58dfd SE |
585 | |
586 | st->retries=1; /* Peer will retransmit MSG5 if necessary */ | |
587 | return True; | |
588 | } | |
589 | ||
590 | static bool_t process_msg6(struct site *st, struct buffer_if *msg6, | |
591 | struct sockaddr_in *src) | |
592 | { | |
593 | struct msg0 m; | |
594 | string_t transform_err; | |
595 | ||
596 | if (!unpick_msg0(st,msg6,&m)) return False; | |
597 | ||
598 | if (st->new_transform->reverse(st->new_transform->st, | |
599 | msg6,&transform_err)) { | |
600 | /* There's a problem */ | |
59635212 | 601 | slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err); |
2fe58dfd SE |
602 | return False; |
603 | } | |
604 | /* Buffer should now contain untransformed PING packet data */ | |
605 | CHECK_AVAIL(msg6,4); | |
59635212 SE |
606 | if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) { |
607 | slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data"); | |
2fe58dfd SE |
608 | return False; |
609 | } | |
610 | CHECK_EMPTY(msg6); | |
611 | return True; | |
612 | } | |
613 | ||
614 | static bool_t process_msg0(struct site *st, struct buffer_if *msg0, | |
615 | struct sockaddr_in *src) | |
616 | { | |
617 | struct msg0 m; | |
618 | string_t transform_err; | |
619 | uint32_t type; | |
620 | ||
621 | if (!st->current_valid) { | |
622 | slog(st,LOG_DROP,"incoming message but no current key -> dropping"); | |
9d3a4132 | 623 | return initiate_key_setup(st); |
2fe58dfd SE |
624 | } |
625 | ||
626 | if (!unpick_msg0(st,msg0,&m)) return False; | |
627 | ||
628 | if (st->current_transform->reverse(st->current_transform->st, | |
629 | msg0,&transform_err)) { | |
630 | /* There's a problem */ | |
59635212 | 631 | slog(st,LOG_SEC,"transform: %s",transform_err); |
c6f79b17 | 632 | return initiate_key_setup(st); |
2fe58dfd SE |
633 | } |
634 | CHECK_AVAIL(msg0,4); | |
59635212 | 635 | type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
636 | switch(type) { |
637 | case LABEL_MSG9: | |
638 | /* Deliver to netlink layer */ | |
639 | st->netlink->deliver(st->netlink->st,st->netlink_cid,msg0); | |
640 | return True; | |
641 | break; | |
642 | default: | |
59635212 | 643 | slog(st,LOG_SEC,"incoming message of type %08x (unknown)",type); |
2fe58dfd SE |
644 | break; |
645 | } | |
646 | return False; | |
647 | } | |
648 | ||
649 | static void dump_packet(struct site *st, struct buffer_if *buf, | |
650 | struct sockaddr_in *addr, bool_t incoming) | |
651 | { | |
59635212 SE |
652 | uint32_t dest=ntohl(*(uint32_t *)buf->start); |
653 | uint32_t source=ntohl(*(uint32_t *)(buf->start+4)); | |
654 | uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8)); | |
2fe58dfd SE |
655 | |
656 | if (st->log_events & LOG_DUMP) | |
b2a56f7c | 657 | log(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:", |
9d3a4132 | 658 | st->tunname,incoming?"incoming":"outgoing", |
2fe58dfd SE |
659 | dest,source,msgtype); |
660 | } | |
661 | ||
662 | static uint32_t site_status(void *st) | |
663 | { | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static bool_t send_msg(struct site *st) | |
668 | { | |
669 | if (st->retries>0) { | |
670 | dump_packet(st,&st->buffer,&st->setup_peer,False); | |
671 | st->comm->sendmsg(st->comm->st,&st->buffer,&st->setup_peer); | |
672 | st->timeout=st->now+st->setup_timeout; | |
673 | st->retries--; | |
674 | return True; | |
675 | } else { | |
3454dce4 SE |
676 | slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet " |
677 | "(in state %s)",state_name(st->state)); | |
2fe58dfd SE |
678 | enter_state_wait(st); |
679 | return False; | |
680 | } | |
681 | } | |
682 | ||
683 | static void site_resolve_callback(void *sst, struct in_addr *address) | |
684 | { | |
685 | struct site *st=sst; | |
686 | ||
687 | if (st->state!=SITE_RESOLVE) { | |
688 | slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly"); | |
689 | return; | |
690 | } | |
691 | if (address) { | |
692 | memset(&st->setup_peer,0,sizeof(st->setup_peer)); | |
693 | st->setup_peer.sin_family=AF_INET; | |
694 | st->setup_peer.sin_port=htons(st->remoteport); | |
695 | st->setup_peer.sin_addr=*address; | |
696 | enter_state_sentmsg1(st); | |
697 | } else { | |
698 | /* Resolution failed */ | |
699 | slog(st,LOG_ERROR,"resolution of %s failed",st->address); | |
700 | enter_state_run(st); | |
701 | } | |
702 | } | |
703 | ||
9d3a4132 SE |
704 | static bool_t initiate_key_setup(struct site *st) |
705 | { | |
706 | if (st->state!=SITE_RUN) return False; | |
707 | if (st->address) { | |
708 | slog(st,LOG_SETUP_INIT,"initiating key exchange; resolving address"); | |
709 | return enter_state_resolve(st); | |
710 | } else if (st->peer_valid) { | |
711 | slog(st,LOG_SETUP_INIT,"initiating key exchange using old " | |
712 | "peer address"); | |
713 | st->setup_peer=st->peer; | |
714 | return enter_state_sentmsg1(st); | |
715 | } | |
716 | return False; | |
717 | } | |
718 | ||
2fe58dfd SE |
719 | static void activate_new_key(struct site *st) |
720 | { | |
721 | struct transform_inst_if *t; | |
722 | ||
723 | t=st->current_transform; | |
724 | st->current_transform=st->new_transform; | |
725 | st->new_transform=t; | |
726 | ||
727 | t->delkey(t->st); | |
2fe58dfd SE |
728 | st->timeout=0; |
729 | st->current_valid=True; | |
730 | st->current_key_timeout=st->now+st->key_lifetime; | |
731 | st->peer=st->setup_peer; | |
732 | st->peer_valid=True; | |
733 | st->remote_session_id=st->setup_session_id; | |
734 | ||
735 | slog(st,LOG_ACTIVATE_KEY,"new key activated"); | |
9d3a4132 | 736 | enter_state_run(st); |
2fe58dfd SE |
737 | } |
738 | ||
739 | static void state_assert(struct site *st, bool_t ok) | |
740 | { | |
741 | if (!ok) fatal("state_assert\n"); | |
742 | } | |
743 | ||
744 | static void enter_state_stop(struct site *st) | |
745 | { | |
746 | st->state=SITE_STOP; | |
747 | st->timeout=0; | |
748 | st->current_transform->delkey(st->current_transform->st); | |
749 | st->current_valid=False; | |
750 | st->current_key_timeout=0; | |
751 | ||
752 | st->peer_valid=False; | |
9d3a4132 SE |
753 | |
754 | set_link_quality(st); | |
2fe58dfd SE |
755 | |
756 | st->new_transform->delkey(st->new_transform->st); | |
757 | } | |
758 | ||
9d3a4132 SE |
759 | static void set_link_quality(struct site *st) |
760 | { | |
761 | uint32_t quality; | |
762 | if (st->current_valid) | |
763 | quality=LINK_QUALITY_UP; | |
764 | else if (st->state==SITE_WAIT || st->state==SITE_STOP) | |
765 | quality=LINK_QUALITY_DOWN; | |
766 | else if (st->address) | |
767 | quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS; | |
768 | else if (st->peer_valid) | |
769 | quality=LINK_QUALITY_DOWN_STALE_ADDRESS; | |
770 | else | |
771 | quality=LINK_QUALITY_DOWN; | |
772 | ||
773 | st->netlink->set_quality(st->netlink->st,st->netlink_cid,quality); | |
774 | } | |
775 | ||
2fe58dfd SE |
776 | static void enter_state_run(struct site *st) |
777 | { | |
778 | slog(st,LOG_STATE,"entering state RUN"); | |
779 | st->state=SITE_RUN; | |
780 | st->timeout=0; | |
9d3a4132 SE |
781 | |
782 | set_link_quality(st); | |
2fe58dfd SE |
783 | /* XXX get rid of key setup data */ |
784 | } | |
785 | ||
786 | static bool_t enter_state_resolve(struct site *st) | |
787 | { | |
788 | state_assert(st,st->state==SITE_RUN); | |
789 | slog(st,LOG_STATE,"entering state RESOLVE"); | |
790 | st->state=SITE_RESOLVE; | |
791 | st->resolver->request(st->resolver->st,st->address, | |
792 | site_resolve_callback,st); | |
793 | return True; | |
794 | } | |
795 | ||
796 | static bool_t enter_state_sentmsg1(struct site *st) | |
797 | { | |
798 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE); | |
799 | slog(st,LOG_STATE,"entering state SENTMSG1"); | |
800 | if (generate_msg1(st) && send_msg(st)) { | |
801 | st->state=SITE_SENTMSG1; | |
802 | return True; | |
803 | } | |
804 | slog(st,LOG_ERROR,"error entering state SENTMSG1"); | |
805 | st->buffer.free=False; /* Can't tell which it was, but enter_state_wait() | |
806 | will do a BUF_FREE() */ | |
807 | enter_state_wait(st); | |
808 | return False; | |
809 | } | |
810 | ||
811 | static bool_t enter_state_sentmsg2(struct site *st) | |
812 | { | |
813 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
814 | st->state==SITE_SENTMSG1 || st->state==SITE_WAIT); | |
815 | slog(st,LOG_STATE,"entering state SENTMSG2"); | |
816 | if (generate_msg2(st) && send_msg(st)) { | |
817 | st->state=SITE_SENTMSG2; | |
818 | return True; | |
819 | } | |
820 | slog(st,LOG_ERROR,"error entering state SENTMSG2"); | |
821 | st->buffer.free=False; | |
822 | enter_state_wait(st); | |
823 | return False; | |
824 | } | |
825 | ||
826 | static bool_t enter_state_sentmsg3(struct site *st) | |
827 | { | |
828 | state_assert(st,st->state==SITE_SENTMSG1); | |
829 | slog(st,LOG_STATE,"entering state SENTMSG3"); | |
830 | BUF_FREE(&st->buffer); /* Free message 1 */ | |
831 | if (generate_msg3(st) && send_msg(st)) { | |
832 | st->state=SITE_SENTMSG3; | |
833 | return True; | |
834 | } | |
835 | slog(st,LOG_ERROR,"error entering state SENTMSG3"); | |
836 | st->buffer.free=False; | |
837 | enter_state_wait(st); | |
838 | return False; | |
839 | } | |
840 | ||
841 | static bool_t enter_state_sentmsg4(struct site *st) | |
842 | { | |
843 | state_assert(st,st->state==SITE_SENTMSG2); | |
844 | slog(st,LOG_STATE,"entering state SENTMSG4"); | |
845 | BUF_FREE(&st->buffer); /* Free message 2 */ | |
846 | if (generate_msg4(st) && send_msg(st)) { | |
847 | st->state=SITE_SENTMSG4; | |
848 | return True; | |
849 | } | |
850 | slog(st,LOG_ERROR,"error entering state SENTMSG4"); | |
851 | st->buffer.free=False; | |
852 | enter_state_wait(st); | |
853 | return False; | |
854 | } | |
855 | ||
856 | static bool_t enter_state_sentmsg5(struct site *st) | |
857 | { | |
858 | state_assert(st,st->state==SITE_SENTMSG3); | |
859 | slog(st,LOG_STATE,"entering state SENTMSG5"); | |
860 | BUF_FREE(&st->buffer); /* Free message 3 */ | |
861 | ||
862 | if (generate_msg5(st) && send_msg(st)) { | |
863 | st->state=SITE_SENTMSG5; | |
864 | return True; | |
865 | } | |
866 | slog(st,LOG_ERROR,"error entering state SENTMSG5"); | |
867 | st->buffer.free=False; | |
868 | enter_state_wait(st); | |
869 | ||
870 | return False; | |
871 | } | |
872 | ||
873 | static bool_t send_msg6(struct site *st) | |
874 | { | |
875 | state_assert(st,st->state==SITE_SENTMSG4); | |
876 | slog(st,LOG_STATE,"entering state RUN after sending msg6"); | |
877 | BUF_FREE(&st->buffer); /* Free message 4 */ | |
878 | if (generate_msg6(st) && send_msg(st)) { | |
879 | BUF_FREE(&st->buffer); /* Never reused */ | |
880 | st->timeout=0; /* Never retransmit */ | |
881 | activate_new_key(st); | |
882 | return True; | |
883 | } | |
884 | slog(st,LOG_ERROR,"error entering state RUN after sending msg6"); | |
885 | st->buffer.free=False; | |
886 | enter_state_wait(st); | |
887 | return False; | |
888 | } | |
889 | ||
890 | /* We go into this state if our peer becomes uncommunicative. Similar to | |
891 | the "stop" state, we forget all session keys for a while, before | |
892 | re-entering the "run" state. */ | |
893 | static void enter_state_wait(struct site *st) | |
894 | { | |
895 | slog(st,LOG_STATE,"entering state WAIT"); | |
896 | st->timeout=st->now+st->wait_timeout; | |
897 | st->state=SITE_WAIT; | |
898 | st->peer_valid=False; | |
9d3a4132 | 899 | set_link_quality(st); |
2fe58dfd SE |
900 | BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */ |
901 | /* XXX Erase keys etc. */ | |
902 | } | |
903 | ||
904 | static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, | |
905 | int *timeout_io, const struct timeval *tv_now, | |
906 | uint64_t *now) | |
907 | { | |
908 | struct site *st=sst; | |
909 | ||
910 | *nfds_io=0; /* We don't use any file descriptors */ | |
911 | st->now=*now; | |
912 | ||
913 | /* Work out when our next timeout is. The earlier of 'timeout' or | |
914 | 'current_key_timeout'. A stored value of '0' indicates no timeout | |
915 | active. */ | |
916 | if (st->timeout && st->timeout-*now < *timeout_io) { | |
917 | *timeout_io=st->timeout-*now; | |
918 | } | |
919 | ||
920 | if (st->current_key_timeout && st->current_key_timeout-*now < *timeout_io) | |
921 | *timeout_io=st->current_key_timeout-*now; | |
922 | ||
923 | return 0; /* success */ | |
924 | } | |
925 | ||
926 | /* NB site_afterpoll will be called before site_beforepoll is ever called */ | |
927 | static void site_afterpoll(void *sst, struct pollfd *fds, int nfds, | |
928 | const struct timeval *tv_now, uint64_t *now) | |
929 | { | |
930 | struct site *st=sst; | |
931 | ||
932 | st->now=*now; | |
933 | if (st->timeout && *now>st->timeout) { | |
934 | /* Do stuff */ | |
935 | st->timeout=0; | |
936 | if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) | |
937 | send_msg(st); | |
938 | else if (st->state==SITE_WAIT) { | |
939 | enter_state_run(st); | |
940 | } else { | |
941 | slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d", | |
942 | st->state); | |
943 | } | |
944 | } | |
945 | if (st->current_key_timeout && *now>st->current_key_timeout) { | |
946 | slog(st,LOG_TIMEOUT_KEY,"maximum key life exceeded; session closed"); | |
947 | st->current_valid=False; | |
948 | st->current_transform->delkey(st->current_transform->st); | |
949 | st->current_key_timeout=0; | |
9d3a4132 | 950 | set_link_quality(st); |
2fe58dfd SE |
951 | } |
952 | } | |
953 | ||
954 | /* This function is called by the netlink device to deliver packets | |
955 | intended for the remote network. The packet is in "raw" wire | |
956 | format, but is guaranteed to be word-aligned. */ | |
957 | static void site_outgoing(void *sst, void *cid, struct buffer_if *buf) | |
958 | { | |
959 | struct site *st=sst; | |
960 | string_t transform_err; | |
961 | ||
962 | if (st->state==SITE_STOP) { | |
963 | BUF_FREE(buf); | |
964 | return; | |
965 | } | |
966 | ||
967 | /* In all other states we consider delivering the packet if we have | |
968 | a valid key and a valid address to send it to. */ | |
969 | if (st->current_valid && st->peer_valid) { | |
970 | /* Transform it and send it */ | |
70dc107b SE |
971 | if (buf->size>0) { |
972 | buf_prepend_uint32(buf,LABEL_MSG9); | |
973 | st->current_transform->forwards(st->current_transform->st, | |
974 | buf, &transform_err); | |
975 | buf_prepend_uint32(buf,LABEL_MSG0); | |
976 | buf_prepend_uint32(buf,(uint32_t)st); | |
977 | buf_prepend_uint32(buf,st->remote_session_id); | |
978 | st->comm->sendmsg(st->comm->st,buf,&st->peer); | |
979 | } | |
2fe58dfd SE |
980 | BUF_FREE(buf); |
981 | return; | |
982 | } | |
983 | ||
70dc107b | 984 | slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size); |
2fe58dfd | 985 | BUF_FREE(buf); |
9d3a4132 | 986 | initiate_key_setup(st); |
2fe58dfd SE |
987 | } |
988 | ||
989 | /* This function is called by the communication device to deliver | |
990 | packets from our peers. */ | |
991 | static bool_t site_incoming(void *sst, struct buffer_if *buf, | |
992 | struct sockaddr_in *source) | |
993 | { | |
994 | struct site *st=sst; | |
59635212 | 995 | uint32_t dest=ntohl(*(uint32_t *)buf->start); |
2fe58dfd SE |
996 | |
997 | if (dest==0) { | |
998 | if (buf->size<(st->setupsiglen+8+NONCELEN)) return False; | |
999 | /* It could be for any site - it should have LABEL_MSG1 and | |
1000 | might have our name and our peer's name in it */ | |
1001 | if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) { | |
1002 | dump_packet(st,buf,source,True); | |
1003 | /* It's addressed to us. Decide what to do about it. */ | |
1004 | if (st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1005 | st->state==SITE_WAIT) { | |
1006 | /* We should definitely process it */ | |
1007 | if (process_msg1(st,buf,source)) { | |
1008 | slog(st,LOG_SETUP_INIT,"key setup initiated by peer"); | |
1009 | enter_state_sentmsg2(st); | |
1010 | } else { | |
1011 | slog(st,LOG_ERROR,"failed to process incoming msg1"); | |
1012 | } | |
1013 | BUF_FREE(buf); | |
1014 | return True; | |
1015 | } | |
1016 | if (st->state==SITE_SENTMSG1) { | |
1017 | /* We've just sent a message 1! They may have crossed on | |
1018 | the wire. If we have priority then we ignore the | |
1019 | incoming one, otherwise we process it as usual. */ | |
1020 | if (st->setup_priority) { | |
1021 | BUF_FREE(buf); | |
1022 | slog(st,LOG_DUMP,"crossed msg1s; we are higher " | |
1023 | "priority => ignore incoming msg1"); | |
1024 | return True; | |
1025 | } else { | |
1026 | slog(st,LOG_DUMP,"crossed msg1s; we are lower " | |
1027 | "priority => use incoming msg1"); | |
1028 | if (process_msg1(st,buf,source)) { | |
1029 | BUF_FREE(&st->buffer); /* Free our old message 1 */ | |
1030 | enter_state_sentmsg2(st); | |
1031 | } else { | |
1032 | slog(st,LOG_ERROR,"failed to process an incoming " | |
1033 | "crossed msg1 (we have low priority)"); | |
1034 | } | |
1035 | BUF_FREE(buf); | |
1036 | return True; | |
1037 | } | |
1038 | } | |
1039 | /* The message 1 was received at an unexpected stage of the | |
1040 | key setup. XXX POLICY - what do we do? */ | |
1041 | slog(st,LOG_UNEXPECTED,"unexpected incoming message 1"); | |
1042 | BUF_FREE(buf); | |
1043 | return True; | |
1044 | } | |
1045 | return False; /* Not for us. */ | |
1046 | } | |
1047 | if (dest==(uint32_t)st) { | |
59635212 | 1048 | uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8)); |
2fe58dfd SE |
1049 | /* Explicitly addressed to us */ |
1050 | if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True); | |
1051 | switch (msgtype) { | |
1052 | case LABEL_MSG0: | |
1053 | process_msg0(st,buf,source); | |
1054 | break; | |
1055 | case LABEL_MSG1: | |
1056 | /* Setup packet: should not have been explicitly addressed | |
1057 | to us */ | |
59635212 | 1058 | slog(st,LOG_SEC,"incoming explicitly addressed msg1"); |
2fe58dfd SE |
1059 | break; |
1060 | case LABEL_MSG2: | |
1061 | /* Setup packet: expected only in state SENTMSG1 */ | |
1062 | if (st->state!=SITE_SENTMSG1) { | |
1063 | slog(st,LOG_UNEXPECTED,"unexpected MSG2"); | |
1064 | } else if (process_msg2(st,buf,source)) | |
1065 | enter_state_sentmsg3(st); | |
1066 | else { | |
59635212 | 1067 | slog(st,LOG_SEC,"invalid MSG2"); |
2fe58dfd SE |
1068 | } |
1069 | break; | |
1070 | case LABEL_MSG3: | |
1071 | /* Setup packet: expected only in state SENTMSG2 */ | |
1072 | if (st->state!=SITE_SENTMSG2) { | |
1073 | slog(st,LOG_UNEXPECTED,"unexpected MSG3"); | |
1074 | } else if (process_msg3(st,buf,source)) | |
1075 | enter_state_sentmsg4(st); | |
1076 | else { | |
59635212 | 1077 | slog(st,LOG_SEC,"invalid MSG3"); |
2fe58dfd SE |
1078 | } |
1079 | break; | |
1080 | case LABEL_MSG4: | |
1081 | /* Setup packet: expected only in state SENTMSG3 */ | |
1082 | if (st->state!=SITE_SENTMSG3) { | |
1083 | slog(st,LOG_UNEXPECTED,"unexpected MSG4"); | |
1084 | } else if (process_msg4(st,buf,source)) | |
1085 | enter_state_sentmsg5(st); | |
1086 | else { | |
59635212 | 1087 | slog(st,LOG_SEC,"invalid MSG4"); |
2fe58dfd SE |
1088 | } |
1089 | break; | |
1090 | case LABEL_MSG5: | |
4efd681a SE |
1091 | /* Setup packet: expected only in state SENTMSG4 */ |
1092 | /* (may turn up in state RUN if our return MSG6 was lost | |
1093 | and the new key has already been activated. In that | |
1094 | case we should treat it as an ordinary PING packet. We | |
1095 | can't pass it to process_msg5() because the | |
1096 | new_transform will now be null. XXX) */ | |
1097 | if (st->state!=SITE_SENTMSG4) { | |
2fe58dfd SE |
1098 | slog(st,LOG_UNEXPECTED,"unexpected MSG5"); |
1099 | } else if (process_msg5(st,buf,source)) { | |
1100 | send_msg6(st); | |
1101 | } else { | |
59635212 | 1102 | slog(st,LOG_SEC,"invalid MSG5"); |
2fe58dfd SE |
1103 | } |
1104 | break; | |
1105 | case LABEL_MSG6: | |
1106 | /* Setup packet: expected only in state SENTMSG5 */ | |
1107 | if (st->state!=SITE_SENTMSG5) { | |
1108 | slog(st,LOG_UNEXPECTED,"unexpected MSG6"); | |
1109 | } else if (process_msg6(st,buf,source)) { | |
1110 | BUF_FREE(&st->buffer); /* Free message 5 */ | |
1111 | activate_new_key(st); | |
1112 | } else { | |
59635212 | 1113 | slog(st,LOG_SEC,"invalid MSG6"); |
2fe58dfd SE |
1114 | } |
1115 | break; | |
1116 | case LABEL_MSG8: | |
1117 | /* NAK packet: enter state where we ping and check for response */ | |
1118 | slog(st,LOG_ERROR,"received a NAK"); | |
1119 | break; | |
1120 | default: | |
59635212 | 1121 | slog(st,LOG_SEC,"received message of unknown type 0x%08x", |
2fe58dfd SE |
1122 | msgtype); |
1123 | break; | |
1124 | } | |
1125 | BUF_FREE(buf); | |
1126 | return True; | |
1127 | } | |
1128 | ||
1129 | return False; | |
1130 | } | |
1131 | ||
1132 | static void site_control(void *vst, bool_t run) | |
1133 | { | |
1134 | struct site *st=vst; | |
1135 | if (run) enter_state_run(st); | |
1136 | else enter_state_stop(st); | |
1137 | } | |
1138 | ||
1139 | static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, | |
1140 | list_t *args) | |
1141 | { | |
1142 | struct site *st; | |
1143 | item_t *item; | |
1144 | dict_t *dict; | |
3454dce4 | 1145 | uint32_t netlink_options; |
2fe58dfd SE |
1146 | |
1147 | st=safe_malloc(sizeof(*st),"site_apply"); | |
1148 | ||
1149 | st->cl.description="site"; | |
1150 | st->cl.type=CL_SITE; | |
1151 | st->cl.apply=NULL; | |
1152 | st->cl.interface=&st->ops; | |
1153 | st->ops.st=st; | |
1154 | st->ops.control=site_control; | |
1155 | st->ops.status=site_status; | |
1156 | ||
1157 | /* First parameter must be a dict */ | |
1158 | item=list_elem(args,0); | |
1159 | if (!item || item->type!=t_dict) | |
1160 | cfgfatal(loc,"site","parameter must be a dictionary\n"); | |
1161 | ||
1162 | dict=item->data.dict; | |
558fa3fb SE |
1163 | st->localname=dict_read_string(dict, "local-name", True, "site", loc); |
1164 | st->remotename=dict_read_string(dict, "name", True, "site", loc); | |
1165 | /* Sanity check (which also allows the 'sites' file to include | |
1166 | site() closures for all sites including our own): refuse to | |
1167 | talk to ourselves */ | |
1168 | if (strcmp(st->localname,st->remotename)==0) { | |
b2a56f7c | 1169 | Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n", |
baa06aeb | 1170 | st->localname); |
558fa3fb SE |
1171 | free(st); |
1172 | return NULL; | |
1173 | } | |
2fe58dfd SE |
1174 | st->netlink=find_cl_if(dict,"netlink",CL_NETLINK,True,"site",loc); |
1175 | st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc); | |
1176 | st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); | |
1177 | st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); | |
1178 | st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc); | |
1179 | ||
2fe58dfd | 1180 | st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc); |
2fe58dfd | 1181 | st->address=dict_read_string(dict, "address", False, "site", loc); |
3454dce4 SE |
1182 | if (st->address) |
1183 | st->remoteport=dict_read_number(dict,"port",True,"site",loc,0); | |
1184 | else st->remoteport=0; | |
2fe58dfd SE |
1185 | dict_read_subnet_list(dict, "networks", True, "site", loc, |
1186 | &st->remotenets); | |
1187 | st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); | |
1188 | ||
1189 | st->transform= | |
1190 | find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc); | |
1191 | ||
1192 | st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); | |
1193 | st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); | |
1194 | ||
9d3a4132 SE |
1195 | st->key_lifetime=dict_read_number( |
1196 | dict,"key-lifetime",False,"site",loc,DEFAULT_KEY_LIFETIME); | |
1197 | if (st->key_lifetime < DEFAULT_KEY_RENEGOTIATE_GAP) | |
1198 | st->key_renegotiate_time=st->key_lifetime/2; | |
1199 | else | |
1200 | st->key_renegotiate_time=st->key_lifetime-DEFAULT_KEY_RENEGOTIATE_GAP; | |
1201 | st->setup_retries=dict_read_number( | |
1202 | dict,"setup-retries",False,"site",loc,DEFAULT_SETUP_RETRIES); | |
1203 | st->setup_timeout=dict_read_number( | |
1204 | dict,"setup-timeout",False,"site",loc,DEFAULT_SETUP_TIMEOUT); | |
1205 | st->wait_timeout=dict_read_number( | |
1206 | dict,"wait-time",False,"site",loc,DEFAULT_WAIT_TIME); | |
1207 | st->key_renegotiate_time=dict_read_number( | |
1208 | dict,"renegotiate-time",False,"site",loc,st->key_lifetime); | |
1209 | if (st->key_renegotiate_time > st->key_lifetime) { | |
1210 | cfgfatal(loc,"site", | |
1211 | "renegotiate-time must be less than key-lifetime\n"); | |
1212 | } | |
1213 | /* XXX keepalive will eventually default to True */ | |
1214 | st->keepalive=dict_read_bool(dict,"keepalive",False,"site",loc,False); | |
1215 | ||
1216 | st->log_events=string_list_to_word(dict_lookup(dict,"log-events"), | |
1217 | log_event_table,"site"); | |
2fe58dfd | 1218 | |
3454dce4 SE |
1219 | netlink_options=string_list_to_word(dict_lookup(dict,"netlink-options"), |
1220 | netlink_option_table,"site"); | |
1221 | ||
4efd681a SE |
1222 | st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5, |
1223 | "site_apply"); | |
1224 | sprintf(st->tunname,"%s<->%s",st->localname,st->remotename); | |
1225 | ||
2fe58dfd SE |
1226 | /* The information we expect to see in incoming messages of type 1 */ |
1227 | st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8; | |
1228 | st->setupsig=safe_malloc(st->setupsiglen,"site_apply"); | |
8689b3a9 SE |
1229 | put_uint32(st->setupsig+0,LABEL_MSG1); |
1230 | put_uint16(st->setupsig+4,strlen(st->remotename)); | |
2fe58dfd | 1231 | memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename)); |
8689b3a9 | 1232 | put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname)); |
2fe58dfd SE |
1233 | memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname, |
1234 | strlen(st->localname)); | |
1235 | st->setup_priority=(strcmp(st->localname,st->remotename)>0); | |
1236 | ||
1237 | buffer_new(&st->buffer,SETUP_BUFFER_LEN); | |
1238 | ||
1239 | /* We are interested in poll(), but only for timeouts. We don't have | |
1240 | any fds of our own. */ | |
1241 | register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site"); | |
1242 | st->timeout=0; | |
1243 | ||
1244 | st->current_valid=False; | |
1245 | st->current_key_timeout=0; | |
1246 | st->peer_valid=False; | |
1247 | /* XXX mlock these */ | |
1248 | st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); | |
1249 | st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret"); | |
1250 | ||
1251 | /* We need to register the remote networks with the netlink device */ | |
1252 | st->netlink_cid=st->netlink->regnets(st->netlink->st, &st->remotenets, | |
1253 | site_outgoing, st, | |
1254 | st->transform->max_start_pad+(4*4), | |
4efd681a | 1255 | st->transform->max_end_pad, |
3454dce4 | 1256 | netlink_options, st->tunname); |
70dc107b | 1257 | if (!st->netlink_cid) { |
9d3a4132 SE |
1258 | Message(M_WARNING,"%s: netlink device did not let us register " |
1259 | "our remote networks. This site will not start.\n", | |
1260 | st->tunname); | |
1261 | return NULL; /* XXX should free site first */ | |
70dc107b | 1262 | } |
2fe58dfd SE |
1263 | |
1264 | st->comm->request_notify(st->comm->st, st, site_incoming); | |
1265 | ||
1266 | st->current_transform=st->transform->create(st->transform->st); | |
1267 | st->new_transform=st->transform->create(st->transform->st); | |
1268 | ||
1269 | enter_state_stop(st); | |
1270 | ||
1271 | return new_closure(&st->cl); | |
1272 | } | |
1273 | ||
1274 | init_module site_module; | |
1275 | void site_module(dict_t *dict) | |
1276 | { | |
1277 | add_closure(dict,"site",site_apply); | |
1278 | } |