1 /* site.c - manage communication with a remote network site */
3 /* The 'site' code doesn't know anything about the structure of the
4 packets it's transmitting. In fact, under the new netlink
5 configuration scheme it doesn't need to know anything at all about
6 IP addresses, except how to contact its peer. This means it could
7 potentially be used to tunnel other protocols too (IPv6, IPX, plain
8 old Ethernet frames) if appropriate netlink code can be written
9 (and that ought not to be too hard, eg. using the TUN/TAP device to
10 pretend to be an Ethernet interface). */
12 /* At some point in the future the netlink code will be asked for
13 configuration information to go in the PING/PONG packets at the end
14 of the key exchange. */
21 #include <sys/socket.h>
25 #include "unaligned.h"
28 #define SETUP_BUFFER_LEN 2048
30 #define DEFAULT_KEY_LIFETIME (3600*1000) /* [ms] */
31 #define DEFAULT_KEY_RENEGOTIATE_GAP (5*60*1000) /* [ms] */
32 #define DEFAULT_SETUP_RETRIES 5
33 #define DEFAULT_SETUP_RETRY_INTERVAL (2*1000) /* [ms] */
34 #define DEFAULT_WAIT_TIME (20*1000) /* [ms] */
36 #define DEFAULT_MOBILE_KEY_LIFETIME (2*24*3600*1000) /* [ms] */
37 #define DEFAULT_MOBILE_KEY_RENEGOTIATE_GAP (12*3600*1000) /* [ms] */
38 #define DEFAULT_MOBILE_SETUP_RETRIES 30
39 #define DEFAULT_MOBILE_SETUP_RETRY_INTERVAL (1*1000) /* [ms] */
40 #define DEFAULT_MOBILE_WAIT_TIME (10*1000) /* [ms] */
42 #define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */
43 #define DEFAULT_MOBILE_PEERS_MAX 3 /* send at most this many copies (default) */
45 /* Each site can be in one of several possible states. */
48 SITE_STOP - nothing is allowed to happen; tunnel is down;
49 all session keys have been erased
50 -> SITE_RUN upon external instruction
51 SITE_RUN - site up, maybe with valid key
52 -> SITE_RESOLVE upon outgoing packet and no valid key
53 we start name resolution for the other end of the tunnel
54 -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time
55 we send an appropriate message 2
56 SITE_RESOLVE - waiting for name resolution
57 -> SITE_SENTMSG1 upon successful resolution
58 we send an appropriate message 1
59 -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution)
60 we abort resolution and
61 -> SITE_WAIT on timeout or resolution failure
63 -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end
64 -> SITE_SENTMSG3 upon valid incoming message 2
65 -> SITE_WAIT on timeout
67 -> SITE_SENTMSG4 upon valid incoming message 3
68 -> SITE_WAIT on timeout
70 -> SITE_SENTMSG5 upon valid incoming message 4
71 -> SITE_WAIT on timeout
73 -> SITE_RUN upon valid incoming message 5
74 -> SITE_WAIT on timeout
76 -> SITE_RUN upon valid incoming message 6
77 -> SITE_WAIT on timeout
78 SITE_WAIT - failed to establish key; do nothing for a while
79 -> SITE_RUN on timeout
84 #define SITE_RESOLVE 2
85 #define SITE_SENTMSG1 3
86 #define SITE_SENTMSG2 4
87 #define SITE_SENTMSG3 5
88 #define SITE_SENTMSG4 6
89 #define SITE_SENTMSG5 7
92 static cstring_t state_name(uint32_t state)
95 case 0: return "STOP";
97 case 2: return "RESOLVE";
98 case 3: return "SENTMSG1";
99 case 4: return "SENTMSG2";
100 case 5: return "SENTMSG3";
101 case 6: return "SENTMSG4";
102 case 7: return "SENTMSG5";
103 case 8: return "WAIT";
104 default: return "*bad state*";
110 #define LOG_UNEXPECTED 0x00000001
111 #define LOG_SETUP_INIT 0x00000002
112 #define LOG_SETUP_TIMEOUT 0x00000004
113 #define LOG_ACTIVATE_KEY 0x00000008
114 #define LOG_TIMEOUT_KEY 0x00000010
115 #define LOG_SEC 0x00000020
116 #define LOG_STATE 0x00000040
117 #define LOG_DROP 0x00000080
118 #define LOG_DUMP 0x00000100
119 #define LOG_ERROR 0x00000400
120 #define LOG_PEER_ADDRS 0x00000800
122 static struct flagstr log_event_table[]={
123 { "unexpected", LOG_UNEXPECTED },
124 { "setup-init", LOG_SETUP_INIT },
125 { "setup-timeout", LOG_SETUP_TIMEOUT },
126 { "activate-key", LOG_ACTIVATE_KEY },
127 { "timeout-key", LOG_TIMEOUT_KEY },
128 { "security", LOG_SEC },
129 { "state-change", LOG_STATE },
130 { "packet-drop", LOG_DROP },
131 { "dump-packets", LOG_DUMP },
132 { "errors", LOG_ERROR },
133 { "peer-addrs", LOG_PEER_ADDRS },
134 { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT|
135 LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR },
136 { "all", 0xffffffff },
141 /***** TRANSPORT PEERS declarations *****/
143 /* Details of "mobile peer" semantics:
145 - We record mobile_peers_max peer address/port numbers ("peers")
146 for key setup, and separately mobile_peers_max for data
147 transfer. If these lists fill up, we retain the newest peers.
148 (For non-mobile peers we only record one of each.)
150 - Outgoing packets are sent to every recorded peer in the
153 - Data transfer peers are straightforward: whenever we successfully
154 process a data packet, we record the peer. Also, whenever we
155 successfully complete a key setup, we merge the key setup
156 peers into the data transfer peers.
158 (For "non-mobile" peers we simply copy the peer used for
159 successful key setup, and don't change the peer otherwise.)
161 - Key setup peers are slightly more complicated.
163 Whenever we receive and successfully process a key exchange
164 packet, we record the peer.
166 Whenever we try to initiate a key setup, we copy the list of data
167 transfer peers and use it for key setup. But we also look to see
168 if the config supplies an address and port number and if so we
169 add that as a key setup peer (possibly evicting one of the data
170 transfer peers we just copied).
172 (For "non-mobile" peers, if we if we have a configured peer
173 address and port, we always use that; otherwise if we have a
174 current data peer address we use that; otherwise we do not
175 attempt to initiate a key setup for lack of a peer address.)
177 "Record the peer" means
178 1. expire any peers last seen >120s ("mobile-peer-expiry") ago
179 2. add the peer of the just received packet to the applicable list
180 (possibly evicting older entries)
181 NB that we do not expire peers until an incoming packet arrives.
185 #define MAX_MOBILE_PEERS_MAX 5 /* send at most this many copies, compiled max */
189 struct comm_addr addr;
193 /* configuration information */
194 /* runtime information */
196 transport_peer peers[MAX_MOBILE_PEERS_MAX];
199 static void transport_peers_clear(struct site *st, transport_peers *peers);
200 static int transport_peers_valid(transport_peers *peers);
201 static void transport_peers_copy(struct site *st, transport_peers *dst,
202 const transport_peers *src);
204 static void transport_setup_msgok(struct site *st, const struct comm_addr *a);
205 static void transport_data_msgok(struct site *st, const struct comm_addr *a);
206 static bool_t transport_compute_setupinit_peers(struct site *st,
207 const struct comm_addr *configured_addr /* 0 if none or not found */);
208 static void transport_record_peer(struct site *st, transport_peers *peers,
209 const struct comm_addr *addr, const char *m);
211 static void transport_xmit(struct site *st, transport_peers *peers,
212 struct buffer_if *buf, bool_t candebug);
214 /***** END of transport peers declarations *****/
218 struct transform_inst_if *transform;
219 uint64_t key_timeout; /* End of life of current key */
220 uint32_t remote_session_id;
226 /* configuration information */
229 bool_t peer_mobile; /* Mobile client support */
230 int32_t transport_peers_max;
231 string_t tunname; /* localname<->remotename by default, used in logs */
232 string_t address; /* DNS name for bootstrapping, optional */
233 int remoteport; /* Port for bootstrapping, optional */
234 struct netlink_if *netlink;
235 struct comm_if **comms;
237 struct resolver_if *resolver;
239 struct random_if *random;
240 struct rsaprivkey_if *privkey;
241 struct rsapubkey_if *pubkey;
242 struct transform_if *transform;
244 struct hash_if *hash;
246 uint32_t index; /* Index of this site */
247 int32_t setup_retries; /* How many times to send setup packets */
248 int32_t setup_retry_interval; /* Initial timeout for setup packets */
249 int32_t wait_timeout; /* How long to wait if setup unsuccessful */
250 int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
251 int32_t key_lifetime; /* How long a key lasts once set up */
252 int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
253 after this time, initiate a new
256 uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
257 int32_t setupsiglen; /* Allows us to discard packets quickly if
258 they are not for us */
259 bool_t setup_priority; /* Do we have precedence if both sites emit
260 message 1 simultaneously? */
263 /* runtime information */
265 uint64_t now; /* Most recently seen time */
267 /* The currently established session */
268 struct data_key current;
269 uint64_t renegotiate_key_time; /* When we can negotiate a new key */
270 transport_peers peers; /* Current address(es) of peer for data traffic */
272 /* The current key setup protocol exchange. We can only be
273 involved in one of these at a time. There's a potential for
274 denial of service here (the attacker keeps sending a setup
275 packet; we keep trying to continue the exchange, and have to
276 timeout before we can listen for another setup packet); perhaps
277 we should keep a list of 'bad' sources for setup packets. */
278 uint32_t setup_session_id;
279 transport_peers setup_peers;
280 uint8_t localN[NONCELEN]; /* Nonces for key exchange */
281 uint8_t remoteN[NONCELEN];
282 struct buffer_if buffer; /* Current outgoing key exchange packet */
283 struct buffer_if scratch;
284 int32_t retries; /* Number of retries remaining */
285 uint64_t timeout; /* Timeout for current state */
287 uint8_t *sharedsecret;
288 struct transform_inst_if *new_transform; /* For key setup/verify */
291 static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
299 if (event&st->log_events) {
301 case LOG_UNEXPECTED: class=M_INFO; break;
302 case LOG_SETUP_INIT: class=M_INFO; break;
303 case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
304 case LOG_ACTIVATE_KEY: class=M_INFO; break;
305 case LOG_TIMEOUT_KEY: class=M_INFO; break;
306 case LOG_SEC: class=M_SECURITY; break;
307 case LOG_STATE: class=M_DEBUG; break;
308 case LOG_DROP: class=M_DEBUG; break;
309 case LOG_DUMP: class=M_DEBUG; break;
310 case LOG_ERROR: class=M_ERR; break;
311 case LOG_PEER_ADDRS: class=M_DEBUG; break;
312 default: class=M_ERR; break;
315 vsnprintf(buf,sizeof(buf),msg,ap);
316 st->log->log(st->log->st,class,"%s: %s",st->tunname,buf);
321 static void set_link_quality(struct site *st);
322 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel);
323 static bool_t initiate_key_setup(struct site *st, cstring_t reason);
324 static void enter_state_run(struct site *st);
325 static bool_t enter_state_resolve(struct site *st);
326 static bool_t enter_new_state(struct site *st,uint32_t next);
327 static void enter_state_wait(struct site *st);
328 static void activate_new_key(struct site *st);
330 static bool_t current_valid(struct site *st)
332 return st->current.transform->valid(st->current.transform->st);
335 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
336 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
337 #define CHECK_TYPE(b,t) do { uint32_t type; \
338 CHECK_AVAIL((b),4); \
339 type=buf_unprepend_uint32((b)); \
340 if (type!=(t)) return False; } while(0)
359 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
360 out using a transform of config data supplied by netlink */
361 static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
367 st->retries=st->setup_retries;
368 BUF_ALLOC(&st->buffer,what);
369 buffer_init(&st->buffer,0);
370 buf_append_uint32(&st->buffer,
371 (type==LABEL_MSG1?0:st->setup_session_id));
372 buf_append_uint32(&st->buffer,st->index);
373 buf_append_uint32(&st->buffer,type);
374 buf_append_string(&st->buffer,st->localname);
375 buf_append_string(&st->buffer,st->remotename);
376 memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
377 if (type==LABEL_MSG1) return True;
378 memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
379 if (type==LABEL_MSG2) return True;
381 if (hacky_par_mid_failnow()) return False;
383 dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
384 buf_append_string(&st->buffer,dhpub);
386 hash=safe_malloc(st->hash->len, "generate_msg");
387 hst=st->hash->init();
388 st->hash->update(hst,st->buffer.start,st->buffer.size);
389 st->hash->final(hst,hash);
390 sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
391 buf_append_string(&st->buffer,sig);
397 static bool_t unpick_msg(struct site *st, uint32_t type,
398 struct buffer_if *msg, struct msg *m)
400 m->hashstart=msg->start;
402 m->dest=buf_unprepend_uint32(msg);
404 m->source=buf_unprepend_uint32(msg);
405 CHECK_TYPE(msg,type);
407 m->remlen=buf_unprepend_uint16(msg);
408 CHECK_AVAIL(msg,m->remlen);
409 m->remote=buf_unprepend(msg,m->remlen);
411 m->loclen=buf_unprepend_uint16(msg);
412 CHECK_AVAIL(msg,m->loclen);
413 m->local=buf_unprepend(msg,m->loclen);
414 CHECK_AVAIL(msg,NONCELEN);
415 m->nR=buf_unprepend(msg,NONCELEN);
416 if (type==LABEL_MSG1) {
420 CHECK_AVAIL(msg,NONCELEN);
421 m->nL=buf_unprepend(msg,NONCELEN);
422 if (type==LABEL_MSG2) {
427 m->pklen=buf_unprepend_uint16(msg);
428 CHECK_AVAIL(msg,m->pklen);
429 m->pk=buf_unprepend(msg,m->pklen);
430 m->hashlen=msg->start-m->hashstart;
432 m->siglen=buf_unprepend_uint16(msg);
433 CHECK_AVAIL(msg,m->siglen);
434 m->sig=buf_unprepend(msg,m->siglen);
439 static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
442 if (type==LABEL_MSG1) return True;
444 /* Check that the site names and our nonce have been sent
445 back correctly, and then store our peer's nonce. */
446 if (memcmp(m->remote,st->remotename,strlen(st->remotename)!=0)) {
447 *error="wrong remote site name";
450 if (memcmp(m->local,st->localname,strlen(st->localname)!=0)) {
451 *error="wrong local site name";
454 if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
455 *error="wrong locally-generated nonce";
458 if (type==LABEL_MSG2) return True;
459 if (memcmp(m->nR,st->remoteN,NONCELEN)!=0) {
460 *error="wrong remotely-generated nonce";
463 if (type==LABEL_MSG3) return True;
464 if (type==LABEL_MSG4) return True;
465 *error="unknown message type";
469 static bool_t generate_msg1(struct site *st)
471 st->random->generate(st->random->st,NONCELEN,st->localN);
472 return generate_msg(st,LABEL_MSG1,"site:MSG1");
475 static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
476 const struct comm_addr *src)
480 /* We've already determined we're in an appropriate state to
481 process an incoming MSG1, and that the MSG1 has correct values
484 if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
486 transport_record_peer(st,&st->setup_peers,src,"msg1");
487 st->setup_session_id=m.source;
488 memcpy(st->remoteN,m.nR,NONCELEN);
492 static bool_t generate_msg2(struct site *st)
494 st->random->generate(st->random->st,NONCELEN,st->localN);
495 return generate_msg(st,LABEL_MSG2,"site:MSG2");
498 static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
499 const struct comm_addr *src)
504 if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
505 if (!check_msg(st,LABEL_MSG2,&m,&err)) {
506 slog(st,LOG_SEC,"msg2: %s",err);
509 st->setup_session_id=m.source;
510 memcpy(st->remoteN,m.nR,NONCELEN);
514 static bool_t generate_msg3(struct site *st)
516 /* Now we have our nonce and their nonce. Think of a secret key,
517 and create message number 3. */
518 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
519 return generate_msg(st,LABEL_MSG3,"site:MSG3");
522 static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
523 const struct comm_addr *src)
530 if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
531 if (!check_msg(st,LABEL_MSG3,&m,&err)) {
532 slog(st,LOG_SEC,"msg3: %s",err);
536 /* Check signature and store g^x mod m */
537 hash=safe_malloc(st->hash->len, "process_msg3");
538 hst=st->hash->init();
539 st->hash->update(hst,m.hashstart,m.hashlen);
540 st->hash->final(hst,hash);
541 /* Terminate signature with a '0' - cheating, but should be ok */
543 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
544 slog(st,LOG_SEC,"msg3 signature failed check!");
550 /* Terminate their DH public key with a '0' */
552 /* Invent our DH secret key */
553 st->random->generate(st->random->st,st->dh->len,st->dhsecret);
555 /* Generate the shared key */
556 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
557 st->sharedsecret,st->transform->keylen);
559 /* Set up the transform */
560 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
561 st->transform->keylen);
566 static bool_t generate_msg4(struct site *st)
568 /* We have both nonces, their public key and our private key. Generate
569 our public key, sign it and send it to them. */
570 return generate_msg(st,LABEL_MSG4,"site:MSG4");
573 static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
574 const struct comm_addr *src)
581 if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
582 if (!check_msg(st,LABEL_MSG4,&m,&err)) {
583 slog(st,LOG_SEC,"msg4: %s",err);
587 /* Check signature and store g^x mod m */
588 hash=safe_malloc(st->hash->len, "process_msg4");
589 hst=st->hash->init();
590 st->hash->update(hst,m.hashstart,m.hashlen);
591 st->hash->final(hst,hash);
592 /* Terminate signature with a '0' - cheating, but should be ok */
594 if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
595 slog(st,LOG_SEC,"msg4 signature failed check!");
601 /* Terminate their DH public key with a '0' */
603 /* Generate the shared key */
604 st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
605 st->sharedsecret,st->transform->keylen);
606 /* Set up the transform */
607 st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
608 st->transform->keylen);
619 static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0,
623 m->dest=buf_unprepend_uint32(msg0);
625 m->source=buf_unprepend_uint32(msg0);
627 m->type=buf_unprepend_uint32(msg0);
629 /* Leaves transformed part of buffer untouched */
632 static bool_t generate_msg5(struct site *st)
634 cstring_t transform_err;
636 BUF_ALLOC(&st->buffer,"site:MSG5");
637 /* We are going to add four words to the message */
638 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
639 /* Give the netlink code an opportunity to put its own stuff in the
640 message (configuration information, etc.) */
641 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
642 st->new_transform->forwards(st->new_transform->st,&st->buffer,
644 buf_prepend_uint32(&st->buffer,LABEL_MSG5);
645 buf_prepend_uint32(&st->buffer,st->index);
646 buf_prepend_uint32(&st->buffer,st->setup_session_id);
648 st->retries=st->setup_retries;
652 static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
653 const struct comm_addr *src,
654 struct transform_inst_if *transform)
657 cstring_t transform_err;
659 if (!unpick_msg0(st,msg5,&m)) return False;
661 if (transform->reverse(transform->st,msg5,&transform_err)) {
662 /* There's a problem */
663 slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
666 /* Buffer should now contain untransformed PING packet data */
668 if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
669 slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
672 /* Older versions of secnet used to write some config data here
673 * which we ignore. So we don't CHECK_EMPTY */
677 static void create_msg6(struct site *st, struct transform_inst_if *transform,
680 cstring_t transform_err;
682 BUF_ALLOC(&st->buffer,"site:MSG6");
683 /* We are going to add four words to the message */
684 buffer_init(&st->buffer,st->transform->max_start_pad+(4*4));
685 /* Give the netlink code an opportunity to put its own stuff in the
686 message (configuration information, etc.) */
687 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
688 transform->forwards(transform->st,&st->buffer,&transform_err);
689 buf_prepend_uint32(&st->buffer,LABEL_MSG6);
690 buf_prepend_uint32(&st->buffer,st->index);
691 buf_prepend_uint32(&st->buffer,session_id);
694 static bool_t generate_msg6(struct site *st)
696 create_msg6(st,st->new_transform,st->setup_session_id);
697 st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
701 static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
702 const struct comm_addr *src)
705 cstring_t transform_err;
707 if (!unpick_msg0(st,msg6,&m)) return False;
709 if (st->new_transform->reverse(st->new_transform->st,
710 msg6,&transform_err)) {
711 /* There's a problem */
712 slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
715 /* Buffer should now contain untransformed PING packet data */
717 if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) {
718 slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
721 /* Older versions of secnet used to write some config data here
722 * which we ignore. So we don't CHECK_EMPTY */
726 static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0)
728 cstring_t transform_err, newkey_err="n/a";
732 if (!unpick_msg0(st,msg0,&m)) return False;
734 /* Keep a copy so we can try decrypting it with multiple keys */
735 buffer_copy(&st->scratch, msg0);
737 problem = st->current.transform->reverse(st->current.transform->st,
738 msg0,&transform_err);
739 if (!problem) return True;
742 slog(st,LOG_DROP,"transform: %s (merely skew)",transform_err);
746 if (st->state==SITE_SENTMSG5) {
747 buffer_copy(msg0, &st->scratch);
748 if (!st->new_transform->reverse(st->new_transform->st,
750 /* It looks like we didn't get the peer's MSG6 */
751 /* This is like a cut-down enter_new_state(SITE_RUN) */
752 slog(st,LOG_STATE,"will enter state RUN (MSG0 with new key)");
753 BUF_FREE(&st->buffer);
755 activate_new_key(st);
756 return True; /* do process the data in this packet */
760 slog(st,LOG_SEC,"transform: %s (new: %s)",transform_err,newkey_err);
761 initiate_key_setup(st,"incoming message would not decrypt");
765 static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
766 const struct comm_addr *src)
770 if (!decrypt_msg0(st,msg0))
774 type=buf_unprepend_uint32(msg0);
777 /* We must forget about the current session. */
778 delete_key(st,"request from peer",LOG_SEC);
781 /* Deliver to netlink layer */
782 st->netlink->deliver(st->netlink->st,msg0);
783 transport_data_msgok(st,src);
784 /* See whether we should start negotiating a new key */
785 if (st->now > st->renegotiate_key_time)
786 initiate_key_setup(st,"incoming packet in renegotiation window");
789 slog(st,LOG_SEC,"incoming encrypted message of type %08x "
796 static void dump_packet(struct site *st, struct buffer_if *buf,
797 const struct comm_addr *addr, bool_t incoming)
799 uint32_t dest=ntohl(*(uint32_t *)buf->start);
800 uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
801 uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
803 if (st->log_events & LOG_DUMP)
804 slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
805 st->tunname,incoming?"incoming":"outgoing",
806 dest,source,msgtype);
809 static uint32_t site_status(void *st)
814 static bool_t send_msg(struct site *st)
817 transport_xmit(st, &st->setup_peers, &st->buffer, True);
818 st->timeout=st->now+st->setup_retry_interval;
822 slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
823 "(in state %s)",state_name(st->state));
824 enter_state_wait(st);
829 static void site_resolve_callback(void *sst, struct in_addr *address)
832 struct comm_addr ca_buf, *ca_use;
834 if (st->state!=SITE_RESOLVE) {
835 slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
840 ca_buf.comm=st->comms[0];
841 ca_buf.sin.sin_family=AF_INET;
842 ca_buf.sin.sin_port=htons(st->remoteport);
843 ca_buf.sin.sin_addr=*address;
846 slog(st,LOG_ERROR,"resolution of %s failed",st->address);
849 if (transport_compute_setupinit_peers(st,ca_use)) {
850 enter_new_state(st,SITE_SENTMSG1);
852 /* Can't figure out who to try to to talk to */
853 slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
858 static bool_t initiate_key_setup(struct site *st, cstring_t reason)
860 if (st->state!=SITE_RUN) return False;
861 slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
863 slog(st,LOG_SETUP_INIT,"resolving peer address");
864 return enter_state_resolve(st);
865 } else if (transport_compute_setupinit_peers(st,0)) {
866 return enter_new_state(st,SITE_SENTMSG1);
868 slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
872 static void activate_new_key(struct site *st)
874 struct transform_inst_if *t;
876 /* We have two transform instances, which we swap between active
878 t=st->current.transform;
879 st->current.transform=st->new_transform;
884 st->current.key_timeout=st->now+st->key_lifetime;
885 st->renegotiate_key_time=st->now+st->key_renegotiate_time;
886 transport_peers_copy(st,&st->peers,&st->setup_peers);
887 st->current.remote_session_id=st->setup_session_id;
889 slog(st,LOG_ACTIVATE_KEY,"new key activated");
893 static void delete_key(struct site *st, cstring_t reason, uint32_t loglevel)
895 if (current_valid(st)) {
896 slog(st,loglevel,"session closed (%s)",reason);
898 st->current.transform->delkey(st->current.transform->st);
899 st->current.key_timeout=0;
900 set_link_quality(st);
904 static void state_assert(struct site *st, bool_t ok)
906 if (!ok) fatal("site:state_assert");
909 static void enter_state_stop(struct site *st)
913 delete_key(st,"entering state STOP",LOG_TIMEOUT_KEY);
914 st->new_transform->delkey(st->new_transform->st);
917 static void set_link_quality(struct site *st)
920 if (current_valid(st))
921 quality=LINK_QUALITY_UP;
922 else if (st->state==SITE_WAIT || st->state==SITE_STOP)
923 quality=LINK_QUALITY_DOWN;
924 else if (st->address)
925 quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
926 else if (transport_peers_valid(&st->peers))
927 quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
929 quality=LINK_QUALITY_DOWN;
931 st->netlink->set_quality(st->netlink->st,quality);
934 static void enter_state_run(struct site *st)
936 slog(st,LOG_STATE,"entering state RUN");
940 st->setup_session_id=0;
941 transport_peers_clear(st,&st->setup_peers);
942 memset(st->localN,0,NONCELEN);
943 memset(st->remoteN,0,NONCELEN);
944 st->new_transform->delkey(st->new_transform->st);
945 memset(st->dhsecret,0,st->dh->len);
946 memset(st->sharedsecret,0,st->transform->keylen);
947 set_link_quality(st);
950 static bool_t enter_state_resolve(struct site *st)
952 state_assert(st,st->state==SITE_RUN);
953 slog(st,LOG_STATE,"entering state RESOLVE");
954 st->state=SITE_RESOLVE;
955 st->resolver->request(st->resolver->st,st->address,
956 site_resolve_callback,st);
960 static bool_t enter_new_state(struct site *st, uint32_t next)
962 bool_t (*gen)(struct site *st);
965 slog(st,LOG_STATE,"entering state %s",state_name(next));
968 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
972 state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
973 st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
977 state_assert(st,st->state==SITE_SENTMSG1);
978 BUF_FREE(&st->buffer);
982 state_assert(st,st->state==SITE_SENTMSG2);
983 BUF_FREE(&st->buffer);
987 state_assert(st,st->state==SITE_SENTMSG3);
988 BUF_FREE(&st->buffer);
992 state_assert(st,st->state==SITE_SENTMSG4);
993 BUF_FREE(&st->buffer);
998 fatal("enter_new_state(%s): invalid new state",state_name(next));
1002 if (hacky_par_start_failnow()) return False;
1004 r= gen(st) && send_msg(st);
1007 st->setup_retries, st->setup_retry_interval,
1012 if (next==SITE_RUN) {
1013 BUF_FREE(&st->buffer); /* Never reused */
1014 st->timeout=0; /* Never retransmit */
1015 activate_new_key(st);
1019 slog(st,LOG_ERROR,"error entering state %s",state_name(next));
1020 st->buffer.free=False; /* Unconditionally use the buffer; it may be
1021 in either state, and enter_state_wait() will
1023 enter_state_wait(st);
1027 /* msg7 tells our peer that we're about to forget our key */
1028 static bool_t send_msg7(struct site *st, cstring_t reason)
1030 cstring_t transform_err;
1032 if (current_valid(st) && st->buffer.free
1033 && transport_peers_valid(&st->peers)) {
1034 BUF_ALLOC(&st->buffer,"site:MSG7");
1035 buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
1036 buf_append_uint32(&st->buffer,LABEL_MSG7);
1037 buf_append_string(&st->buffer,reason);
1038 st->current.transform->forwards(st->current.transform->st,
1039 &st->buffer, &transform_err);
1040 buf_prepend_uint32(&st->buffer,LABEL_MSG0);
1041 buf_prepend_uint32(&st->buffer,st->index);
1042 buf_prepend_uint32(&st->buffer,st->current.remote_session_id);
1043 transport_xmit(st,&st->peers,&st->buffer,True);
1044 BUF_FREE(&st->buffer);
1050 /* We go into this state if our peer becomes uncommunicative. Similar to
1051 the "stop" state, we forget all session keys for a while, before
1052 re-entering the "run" state. */
1053 static void enter_state_wait(struct site *st)
1055 slog(st,LOG_STATE,"entering state WAIT");
1056 st->timeout=st->now+st->wait_timeout;
1057 st->state=SITE_WAIT;
1058 set_link_quality(st);
1059 BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
1060 /* XXX Erase keys etc. */
1063 static inline void site_settimeout(uint64_t timeout, int *timeout_io)
1066 int64_t offset=timeout-*now;
1067 if (offset<0) offset=0;
1068 if (offset>INT_MAX) offset=INT_MAX;
1069 if (*timeout_io<0 || offset<*timeout_io)
1074 static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
1077 struct site *st=sst;
1079 *nfds_io=0; /* We don't use any file descriptors */
1082 /* Work out when our next timeout is. The earlier of 'timeout' or
1083 'current.key_timeout'. A stored value of '0' indicates no timeout
1085 site_settimeout(st->timeout, timeout_io);
1086 site_settimeout(st->current.key_timeout, timeout_io);
1088 return 0; /* success */
1091 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1092 static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
1094 struct site *st=sst;
1097 if (st->timeout && *now>st->timeout) {
1099 if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
1100 if (!hacky_par_start_failnow())
1102 } else if (st->state==SITE_WAIT) {
1103 enter_state_run(st);
1105 slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
1109 if (st->current.key_timeout && *now>st->current.key_timeout) {
1110 delete_key(st,"maximum key life exceeded",LOG_TIMEOUT_KEY);
1114 /* This function is called by the netlink device to deliver packets
1115 intended for the remote network. The packet is in "raw" wire
1116 format, but is guaranteed to be word-aligned. */
1117 static void site_outgoing(void *sst, struct buffer_if *buf)
1119 struct site *st=sst;
1120 cstring_t transform_err;
1122 if (st->state==SITE_STOP) {
1127 /* In all other states we consider delivering the packet if we have
1128 a valid key and a valid address to send it to. */
1129 if (current_valid(st) && transport_peers_valid(&st->peers)) {
1130 /* Transform it and send it */
1132 buf_prepend_uint32(buf,LABEL_MSG9);
1133 st->current.transform->forwards(st->current.transform->st,
1134 buf, &transform_err);
1135 buf_prepend_uint32(buf,LABEL_MSG0);
1136 buf_prepend_uint32(buf,st->index);
1137 buf_prepend_uint32(buf,st->current.remote_session_id);
1138 transport_xmit(st,&st->peers,buf,False);
1144 slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
1146 initiate_key_setup(st,"outgoing packet");
1149 /* This function is called by the communication device to deliver
1150 packets from our peers. */
1151 static bool_t site_incoming(void *sst, struct buffer_if *buf,
1152 const struct comm_addr *source)
1154 struct site *st=sst;
1156 if (buf->size < 12) return False;
1158 uint32_t dest=ntohl(*(uint32_t *)buf->start);
1161 /* It could be for any site - it should have LABEL_MSG1 and
1162 might have our name and our peer's name in it */
1163 if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
1164 if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
1165 /* It's addressed to us. Decide what to do about it. */
1166 dump_packet(st,buf,source,True);
1167 if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
1168 st->state==SITE_WAIT) {
1169 /* We should definitely process it */
1170 if (process_msg1(st,buf,source)) {
1171 slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
1172 enter_new_state(st,SITE_SENTMSG2);
1174 slog(st,LOG_ERROR,"failed to process incoming msg1");
1178 } else if (st->state==SITE_SENTMSG1) {
1179 /* We've just sent a message 1! They may have crossed on
1180 the wire. If we have priority then we ignore the
1181 incoming one, otherwise we process it as usual. */
1182 if (st->setup_priority) {
1184 slog(st,LOG_DUMP,"crossed msg1s; we are higher "
1185 "priority => ignore incoming msg1");
1188 slog(st,LOG_DUMP,"crossed msg1s; we are lower "
1189 "priority => use incoming msg1");
1190 if (process_msg1(st,buf,source)) {
1191 BUF_FREE(&st->buffer); /* Free our old message 1 */
1192 enter_new_state(st,SITE_SENTMSG2);
1194 slog(st,LOG_ERROR,"failed to process an incoming "
1195 "crossed msg1 (we have low priority)");
1201 /* The message 1 was received at an unexpected stage of the
1202 key setup. XXX POLICY - what do we do? */
1203 slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
1207 return False; /* Not for us. */
1209 if (dest==st->index) {
1210 /* Explicitly addressed to us */
1211 uint32_t msgtype=ntohl(get_uint32(buf->start+8));
1212 if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
1215 /* If the source is our current peer then initiate a key setup,
1216 because our peer's forgotten the key */
1217 if (get_uint32(buf->start+4)==st->current.remote_session_id) {
1218 initiate_key_setup(st,"received a NAK");
1220 slog(st,LOG_SEC,"bad incoming NAK");
1224 process_msg0(st,buf,source);
1227 /* Setup packet: should not have been explicitly addressed
1229 slog(st,LOG_SEC,"incoming explicitly addressed msg1");
1232 /* Setup packet: expected only in state SENTMSG1 */
1233 if (st->state!=SITE_SENTMSG1) {
1234 slog(st,LOG_UNEXPECTED,"unexpected MSG2");
1235 } else if (process_msg2(st,buf,source)) {
1236 transport_setup_msgok(st,source);
1237 enter_new_state(st,SITE_SENTMSG3);
1239 slog(st,LOG_SEC,"invalid MSG2");
1243 /* Setup packet: expected only in state SENTMSG2 */
1244 if (st->state!=SITE_SENTMSG2) {
1245 slog(st,LOG_UNEXPECTED,"unexpected MSG3");
1246 } else if (process_msg3(st,buf,source)) {
1247 transport_setup_msgok(st,source);
1248 enter_new_state(st,SITE_SENTMSG4);
1250 slog(st,LOG_SEC,"invalid MSG3");
1254 /* Setup packet: expected only in state SENTMSG3 */
1255 if (st->state!=SITE_SENTMSG3) {
1256 slog(st,LOG_UNEXPECTED,"unexpected MSG4");
1257 } else if (process_msg4(st,buf,source)) {
1258 transport_setup_msgok(st,source);
1259 enter_new_state(st,SITE_SENTMSG5);
1261 slog(st,LOG_SEC,"invalid MSG4");
1265 /* Setup packet: expected only in state SENTMSG4 */
1266 /* (may turn up in state RUN if our return MSG6 was lost
1267 and the new key has already been activated. In that
1268 case we discard it. The peer will realise that we
1269 are using the new key when they see our data packets.
1270 Until then the peer's data packets to us get discarded. */
1271 if (st->state==SITE_SENTMSG4) {
1272 if (process_msg5(st,buf,source,st->new_transform)) {
1273 transport_setup_msgok(st,source);
1274 enter_new_state(st,SITE_RUN);
1276 slog(st,LOG_SEC,"invalid MSG5");
1278 } else if (st->state==SITE_RUN) {
1279 if (process_msg5(st,buf,source,st->current.transform)) {
1280 slog(st,LOG_DROP,"got MSG5, retransmitting MSG6");
1281 transport_setup_msgok(st,source);
1282 create_msg6(st,st->current.transform,
1283 st->current.remote_session_id);
1284 transport_xmit(st,&st->peers,&st->buffer,True);
1285 BUF_FREE(&st->buffer);
1287 slog(st,LOG_SEC,"invalid MSG5 (in state RUN)");
1290 slog(st,LOG_UNEXPECTED,"unexpected MSG5");
1294 /* Setup packet: expected only in state SENTMSG5 */
1295 if (st->state!=SITE_SENTMSG5) {
1296 slog(st,LOG_UNEXPECTED,"unexpected MSG6");
1297 } else if (process_msg6(st,buf,source)) {
1298 BUF_FREE(&st->buffer); /* Free message 5 */
1299 transport_setup_msgok(st,source);
1300 activate_new_key(st);
1302 slog(st,LOG_SEC,"invalid MSG6");
1306 slog(st,LOG_SEC,"received message of unknown type 0x%08x",
1317 static void site_control(void *vst, bool_t run)
1319 struct site *st=vst;
1320 if (run) enter_state_run(st);
1321 else enter_state_stop(st);
1324 static void site_phase_hook(void *sst, uint32_t newphase)
1326 struct site *st=sst;
1328 /* The program is shutting down; tell our peer */
1329 send_msg7(st,"shutting down");
1332 static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
1335 static uint32_t index_sequence;
1341 st=safe_malloc(sizeof(*st),"site_apply");
1343 st->cl.description="site";
1344 st->cl.type=CL_SITE;
1346 st->cl.interface=&st->ops;
1348 st->ops.control=site_control;
1349 st->ops.status=site_status;
1351 /* First parameter must be a dict */
1352 item=list_elem(args,0);
1353 if (!item || item->type!=t_dict)
1354 cfgfatal(loc,"site","parameter must be a dictionary\n");
1356 dict=item->data.dict;
1357 st->localname=dict_read_string(dict, "local-name", True, "site", loc);
1358 st->remotename=dict_read_string(dict, "name", True, "site", loc);
1360 st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
1361 bool_t local_mobile=
1362 dict_read_bool(dict,"local-mobile",False,"site",loc,False);
1364 /* Sanity check (which also allows the 'sites' file to include
1365 site() closures for all sites including our own): refuse to
1366 talk to ourselves */
1367 if (strcmp(st->localname,st->remotename)==0) {
1368 Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
1370 if (st->peer_mobile != local_mobile)
1371 cfgfatal(loc,"site","site %s's peer-mobile=%d"
1372 " but our local-mobile=%d\n",
1373 st->localname, st->peer_mobile, local_mobile);
1377 if (st->peer_mobile && local_mobile) {
1378 Message(M_WARNING,"site %s: site is mobile but so are we"
1379 " -> ignoring this site\n", st->remotename);
1384 assert(index_sequence < 0xffffffffUL);
1385 st->index = ++index_sequence;
1386 st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
1388 list_t *comms_cfg=dict_lookup(dict,"comm");
1389 if (!comms_cfg) cfgfatal(loc,"site","closure list \"comm\" not found\n");
1390 st->ncomms=list_length(comms_cfg);
1391 st->comms=safe_malloc_ary(sizeof(*st->comms),st->ncomms,"comms");
1393 for (i=0; i<st->ncomms; i++) {
1394 item_t *item=list_elem(comms_cfg,i);
1395 if (item->type!=t_closure)
1396 cfgfatal(loc,"site","comm is not a closure\n");
1397 closure_t *cl=item->data.closure;
1398 if (cl->type!=CL_COMM) cfgfatal(loc,"site","comm closure wrong type\n");
1399 st->comms[i]=cl->interface;
1402 st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
1403 st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
1404 st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
1406 st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
1407 st->address=dict_read_string(dict, "address", False, "site", loc);
1409 st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
1410 else st->remoteport=0;
1411 st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
1414 find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
1416 st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
1417 st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
1419 #define DEFAULT(D) (st->peer_mobile || local_mobile \
1420 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
1421 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
1423 st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
1424 st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
1425 st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
1426 st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
1428 st->mobile_peer_expiry= dict_read_number(
1429 dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
1431 st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
1432 dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
1433 if (st->transport_peers_max<1 ||
1434 st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
1435 cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
1436 STRING(MAX_MOBILE_PEERS_MAX) "\n");
1439 if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
1440 st->key_renegotiate_time=st->key_lifetime/2;
1442 st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
1443 st->key_renegotiate_time=dict_read_number(
1444 dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
1445 if (st->key_renegotiate_time > st->key_lifetime) {
1446 cfgfatal(loc,"site",
1447 "renegotiate-time must be less than key-lifetime\n");
1450 st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
1451 log_event_table,"site");
1453 st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
1455 sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
1457 /* The information we expect to see in incoming messages of type 1 */
1458 /* fixme: lots of unchecked overflows here, but the results are only
1459 corrupted packets rather than undefined behaviour */
1460 st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
1461 st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
1462 put_uint32(st->setupsig+0,LABEL_MSG1);
1463 put_uint16(st->setupsig+4,strlen(st->remotename));
1464 memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
1465 put_uint16(st->setupsig+(6+strlen(st->remotename)),strlen(st->localname));
1466 memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
1467 strlen(st->localname));
1468 st->setup_priority=(strcmp(st->localname,st->remotename)>0);
1470 buffer_new(&st->buffer,SETUP_BUFFER_LEN);
1472 buffer_new(&st->scratch,0);
1473 BUF_ALLOC(&st->scratch,"site:scratch");
1475 /* We are interested in poll(), but only for timeouts. We don't have
1476 any fds of our own. */
1477 register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
1480 st->current.key_timeout=0;
1481 transport_peers_clear(st,&st->peers);
1482 transport_peers_clear(st,&st->setup_peers);
1483 /* XXX mlock these */
1484 st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
1485 st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
1487 /* We need to compute some properties of our comms */
1488 #define COMPUTE_WORST(pad) \
1489 int worst_##pad=0; \
1490 for (i=0; i<st->ncomms; i++) { \
1491 int thispad=st->comms[i]->pad; \
1492 if (thispad > worst_##pad) \
1493 worst_##pad=thispad; \
1495 COMPUTE_WORST(min_start_pad)
1496 COMPUTE_WORST(min_end_pad)
1498 /* We need to register the remote networks with the netlink device */
1499 st->netlink->reg(st->netlink->st, site_outgoing, st,
1500 st->transform->max_start_pad+(4*4)+
1501 worst_min_start_pad,
1502 st->transform->max_end_pad+worst_min_end_pad);
1504 for (i=0; i<st->ncomms; i++)
1505 st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
1507 st->current.transform=st->transform->create(st->transform->st);
1508 st->new_transform=st->transform->create(st->transform->st);
1510 enter_state_stop(st);
1512 add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
1514 return new_closure(&st->cl);
1517 void site_module(dict_t *dict)
1519 add_closure(dict,"site",site_apply);
1523 /***** TRANSPORT PEERS definitions *****/
1525 static void transport_peers_debug(struct site *st, transport_peers *dst,
1526 const char *didwhat,
1527 int nargs, const struct comm_addr *args,
1532 if (!(st->log_events & LOG_PEER_ADDRS))
1533 return; /* an optimisation */
1535 slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
1536 (dst==&st->peers ? "data" :
1537 dst==&st->setup_peers ? "setup" : "UNKNOWN"),
1538 didwhat, nargs, dst->npeers);
1540 for (i=0, argp=(void*)args;
1542 i++, (argp+=stride?stride:sizeof(*args))) {
1543 const struct comm_addr *ca=(void*)argp;
1544 slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
1545 i, ca->comm->addr_to_string(ca->comm->st,ca));
1547 for (i=0; i<dst->npeers; i++) {
1548 struct timeval diff;
1549 timersub(tv_now,&dst->peers[i].last,&diff);
1550 const struct comm_addr *ca=&dst->peers[i].addr;
1551 slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
1552 i, ca->comm->addr_to_string(ca->comm->st,ca),
1553 (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
1557 static int transport_peer_compar(const void *av, const void *bv) {
1558 const transport_peer *a=av;
1559 const transport_peer *b=bv;
1560 /* put most recent first in the array */
1561 if (timercmp(&a->last, &b->last, <)) return +1;
1562 if (timercmp(&a->last, &b->last, >)) return -11;
1566 static void transport_peers_expire(struct site *st, transport_peers *peers) {
1567 /* peers must be sorted first */
1568 int previous_peers=peers->npeers;
1569 struct timeval oldest;
1570 oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
1571 oldest.tv_usec = tv_now->tv_usec;
1572 while (peers->npeers>1 &&
1573 timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
1575 if (peers->npeers != previous_peers)
1576 transport_peers_debug(st,peers,"expire", 0,0,0);
1579 static void transport_record_peer(struct site *st, transport_peers *peers,
1580 const struct comm_addr *addr, const char *m) {
1581 int slot, changed=0;
1583 for (slot=0; slot<peers->npeers; slot++)
1584 if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
1588 if (peers->npeers==st->transport_peers_max)
1589 slot=st->transport_peers_max;
1591 slot=peers->npeers++;
1594 peers->peers[slot].addr=*addr;
1595 peers->peers[slot].last=*tv_now;
1597 if (peers->npeers>1)
1598 qsort(peers->peers, peers->npeers,
1599 sizeof(*peers->peers), transport_peer_compar);
1601 if (changed || peers->npeers!=1)
1602 transport_peers_debug(st,peers,m, 1,addr,0);
1603 transport_peers_expire(st, peers);
1606 static bool_t transport_compute_setupinit_peers(struct site *st,
1607 const struct comm_addr *configured_addr /* 0 if none or not found */) {
1609 if (!configured_addr && !transport_peers_valid(&st->peers))
1612 slog(st,LOG_SETUP_INIT,
1613 (!configured_addr ? "using only %d old peer address(es)"
1614 : "using configured address, and/or perhaps %d old peer address(es)"),
1617 /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
1618 * have transport_peers_max==1. The effect is that this code
1619 * always uses the configured address if supplied, or otherwise
1620 * the existing data peer if one exists; this is as desired. */
1622 transport_peers_copy(st,&st->setup_peers,&st->peers);
1624 if (configured_addr)
1625 transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
1627 assert(transport_peers_valid(&st->setup_peers));
1631 static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
1632 if (st->peer_mobile)
1633 transport_record_peer(st,&st->setup_peers,a,"setupmsg");
1635 static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
1636 if (st->peer_mobile)
1637 transport_record_peer(st,&st->peers,a,"datamsg");
1640 static int transport_peers_valid(transport_peers *peers) {
1641 return peers->npeers;
1643 static void transport_peers_clear(struct site *st, transport_peers *peers) {
1645 transport_peers_debug(st,peers,"clear",0,0,0);
1647 static void transport_peers_copy(struct site *st, transport_peers *dst,
1648 const transport_peers *src) {
1649 dst->npeers=src->npeers;
1650 memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
1651 transport_peers_debug(st,dst,"copy",
1652 src->npeers, &src->peers->addr, sizeof(*src->peers));
1655 void transport_xmit(struct site *st, transport_peers *peers,
1656 struct buffer_if *buf, bool_t candebug) {
1658 transport_peers_expire(st, peers);
1659 for (slot=0; slot<peers->npeers; slot++) {
1660 transport_peer *peer=&peers->peers[slot];
1662 dump_packet(st, buf, &peer->addr, False);
1663 peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
1667 /***** END of transport peers declarations *****/