Commit | Line | Data |
---|---|---|
2fe58dfd SE |
1 | /* site.c - manage communication with a remote network site */ |
2 | ||
c215a4bc IJ |
3 | /* |
4 | * This file is part of secnet. | |
5 | * See README for full list of copyright holders. | |
6 | * | |
7 | * secnet is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version d of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * secnet is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * version 3 along with secnet; if not, see | |
19 | * https://www.gnu.org/licenses/gpl.html. | |
20 | */ | |
21 | ||
469fd1d9 SE |
22 | /* The 'site' code doesn't know anything about the structure of the |
23 | packets it's transmitting. In fact, under the new netlink | |
24 | configuration scheme it doesn't need to know anything at all about | |
25 | IP addresses, except how to contact its peer. This means it could | |
26 | potentially be used to tunnel other protocols too (IPv6, IPX, plain | |
27 | old Ethernet frames) if appropriate netlink code can be written | |
28 | (and that ought not to be too hard, eg. using the TUN/TAP device to | |
29 | pretend to be an Ethernet interface). */ | |
30 | ||
ff05a229 SE |
31 | /* At some point in the future the netlink code will be asked for |
32 | configuration information to go in the PING/PONG packets at the end | |
33 | of the key exchange. */ | |
34 | ||
8689b3a9 | 35 | #include "secnet.h" |
2fe58dfd | 36 | #include <stdio.h> |
469fd1d9 | 37 | #include <string.h> |
fe5e9cc4 | 38 | #include <limits.h> |
58650a70 | 39 | #include <assert.h> |
8689b3a9 | 40 | #include <sys/socket.h> |
2fe58dfd | 41 | |
8689b3a9 | 42 | #include <sys/mman.h> |
2fe58dfd | 43 | #include "util.h" |
59635212 | 44 | #include "unaligned.h" |
ff05a229 | 45 | #include "magic.h" |
2fe58dfd SE |
46 | |
47 | #define SETUP_BUFFER_LEN 2048 | |
48 | ||
e7f8ec2a IJ |
49 | #define DEFAULT_KEY_LIFETIME (3600*1000) /* [ms] */ |
50 | #define DEFAULT_KEY_RENEGOTIATE_GAP (5*60*1000) /* [ms] */ | |
2fe58dfd | 51 | #define DEFAULT_SETUP_RETRIES 5 |
e7f8ec2a IJ |
52 | #define DEFAULT_SETUP_RETRY_INTERVAL (2*1000) /* [ms] */ |
53 | #define DEFAULT_WAIT_TIME (20*1000) /* [ms] */ | |
e57264d6 IJ |
54 | |
55 | #define DEFAULT_MOBILE_KEY_LIFETIME (2*24*3600*1000) /* [ms] */ | |
56 | #define DEFAULT_MOBILE_KEY_RENEGOTIATE_GAP (12*3600*1000) /* [ms] */ | |
57 | #define DEFAULT_MOBILE_SETUP_RETRIES 30 | |
58 | #define DEFAULT_MOBILE_SETUP_RETRY_INTERVAL (1*1000) /* [ms] */ | |
59 | #define DEFAULT_MOBILE_WAIT_TIME (10*1000) /* [ms] */ | |
60 | ||
446353cd | 61 | #define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */ |
2fe58dfd SE |
62 | |
63 | /* Each site can be in one of several possible states. */ | |
64 | ||
65 | /* States: | |
66 | SITE_STOP - nothing is allowed to happen; tunnel is down; | |
67 | all session keys have been erased | |
68 | -> SITE_RUN upon external instruction | |
69 | SITE_RUN - site up, maybe with valid key | |
70 | -> SITE_RESOLVE upon outgoing packet and no valid key | |
71 | we start name resolution for the other end of the tunnel | |
72 | -> SITE_SENTMSG2 upon valid incoming message 1 and suitable time | |
73 | we send an appropriate message 2 | |
74 | SITE_RESOLVE - waiting for name resolution | |
75 | -> SITE_SENTMSG1 upon successful resolution | |
76 | we send an appropriate message 1 | |
77 | -> SITE_SENTMSG2 upon valid incoming message 1 (then abort resolution) | |
78 | we abort resolution and | |
79 | -> SITE_WAIT on timeout or resolution failure | |
80 | SITE_SENTMSG1 | |
81 | -> SITE_SENTMSG2 upon valid incoming message 1 from higher priority end | |
82 | -> SITE_SENTMSG3 upon valid incoming message 2 | |
83 | -> SITE_WAIT on timeout | |
84 | SITE_SENTMSG2 | |
85 | -> SITE_SENTMSG4 upon valid incoming message 3 | |
86 | -> SITE_WAIT on timeout | |
87 | SITE_SENTMSG3 | |
88 | -> SITE_SENTMSG5 upon valid incoming message 4 | |
89 | -> SITE_WAIT on timeout | |
90 | SITE_SENTMSG4 | |
91 | -> SITE_RUN upon valid incoming message 5 | |
92 | -> SITE_WAIT on timeout | |
93 | SITE_SENTMSG5 | |
94 | -> SITE_RUN upon valid incoming message 6 | |
95 | -> SITE_WAIT on timeout | |
96 | SITE_WAIT - failed to establish key; do nothing for a while | |
97 | -> SITE_RUN on timeout | |
98 | */ | |
99 | ||
100 | #define SITE_STOP 0 | |
101 | #define SITE_RUN 1 | |
102 | #define SITE_RESOLVE 2 | |
103 | #define SITE_SENTMSG1 3 | |
104 | #define SITE_SENTMSG2 4 | |
105 | #define SITE_SENTMSG3 5 | |
106 | #define SITE_SENTMSG4 6 | |
107 | #define SITE_SENTMSG5 7 | |
108 | #define SITE_WAIT 8 | |
109 | ||
3abd18e8 IJ |
110 | int32_t site_max_start_pad = 4*4; |
111 | ||
fe5e9cc4 | 112 | static cstring_t state_name(uint32_t state) |
2fe58dfd SE |
113 | { |
114 | switch (state) { | |
3454dce4 SE |
115 | case 0: return "STOP"; |
116 | case 1: return "RUN"; | |
117 | case 2: return "RESOLVE"; | |
118 | case 3: return "SENTMSG1"; | |
119 | case 4: return "SENTMSG2"; | |
120 | case 5: return "SENTMSG3"; | |
121 | case 6: return "SENTMSG4"; | |
122 | case 7: return "SENTMSG5"; | |
123 | case 8: return "WAIT"; | |
2fe58dfd SE |
124 | default: return "*bad state*"; |
125 | } | |
126 | } | |
127 | ||
2fe58dfd SE |
128 | #define NONCELEN 8 |
129 | ||
130 | #define LOG_UNEXPECTED 0x00000001 | |
131 | #define LOG_SETUP_INIT 0x00000002 | |
132 | #define LOG_SETUP_TIMEOUT 0x00000004 | |
133 | #define LOG_ACTIVATE_KEY 0x00000008 | |
134 | #define LOG_TIMEOUT_KEY 0x00000010 | |
9d3a4132 | 135 | #define LOG_SEC 0x00000020 |
2fe58dfd SE |
136 | #define LOG_STATE 0x00000040 |
137 | #define LOG_DROP 0x00000080 | |
138 | #define LOG_DUMP 0x00000100 | |
139 | #define LOG_ERROR 0x00000400 | |
446353cd | 140 | #define LOG_PEER_ADDRS 0x00000800 |
2fe58dfd | 141 | |
9d3a4132 SE |
142 | static struct flagstr log_event_table[]={ |
143 | { "unexpected", LOG_UNEXPECTED }, | |
144 | { "setup-init", LOG_SETUP_INIT }, | |
145 | { "setup-timeout", LOG_SETUP_TIMEOUT }, | |
146 | { "activate-key", LOG_ACTIVATE_KEY }, | |
147 | { "timeout-key", LOG_TIMEOUT_KEY }, | |
148 | { "security", LOG_SEC }, | |
149 | { "state-change", LOG_STATE }, | |
150 | { "packet-drop", LOG_DROP }, | |
151 | { "dump-packets", LOG_DUMP }, | |
152 | { "errors", LOG_ERROR }, | |
446353cd | 153 | { "peer-addrs", LOG_PEER_ADDRS }, |
ff05a229 SE |
154 | { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT| |
155 | LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR }, | |
9d3a4132 SE |
156 | { "all", 0xffffffff }, |
157 | { NULL, 0 } | |
158 | }; | |
159 | ||
446353cd IJ |
160 | |
161 | /***** TRANSPORT PEERS declarations *****/ | |
162 | ||
163 | /* Details of "mobile peer" semantics: | |
f6eff504 | 164 | |
f6eff504 IJ |
165 | - We use the same data structure for the different configurations, |
166 | but manage it with different algorithms. | |
446353cd | 167 | |
f6eff504 IJ |
168 | - We record up to mobile_peers_max peer address/port numbers |
169 | ("peers") for key setup, and separately up to mobile_peers_max | |
170 | for data transfer. | |
171 | ||
172 | - In general, we make a new set of addrs (see below) when we start | |
173 | a new key exchange; the key setup addrs become the data transport | |
174 | addrs when key setup complets. | |
175 | ||
176 | If our peer is mobile: | |
177 | ||
178 | - We send to all recent addresses of incoming packets, plus | |
179 | initially all configured addresses (which we also expire). | |
180 | ||
181 | - So, we record addrs of good incoming packets, as follows: | |
182 | 1. expire any peers last seen >120s ("mobile-peer-expiry") ago | |
183 | 2. add the peer of the just received packet to the applicable list | |
184 | (possibly evicting the oldest entries to make room) | |
185 | NB that we do not expire peers until an incoming packet arrives. | |
446353cd | 186 | |
f6eff504 IJ |
187 | - If the peer has a configured address or name, we record them the |
188 | same way, but only as a result of our own initiation of key | |
189 | setup. (We might evict some incoming packet addrs to make room.) | |
446353cd | 190 | |
f6eff504 IJ |
191 | - The default number of addrs to keep is 3, or 4 if we have a |
192 | configured name or address. That's space for two configured | |
193 | addresses (one IPv6 and one IPv4), plus two received addresses. | |
194 | ||
195 | - Outgoing packets are sent to every recorded address in the | |
196 | applicable list. Any unsupported[1] addresses are deleted from | |
197 | the list right away. (This should only happen to configured | |
198 | addresses, of course, but there is no need to check that.) | |
199 | ||
200 | - When we successfully complete a key setup, we merge the key setup | |
446353cd IJ |
201 | peers into the data transfer peers. |
202 | ||
f6eff504 IJ |
203 | [1] An unsupported address is one for whose AF we don't have a |
204 | socket (perhaps because we got EAFNOSUPPORT or some such) or for | |
205 | which sendto gives ENETUNREACH. | |
206 | ||
207 | If neither end is mobile: | |
208 | ||
209 | - When peer initiated the key exchange, we use the incoming packet | |
210 | address. | |
211 | ||
212 | - When we initiate the key exchange, we try configured addresses | |
213 | until we get one which isn't unsupported then fixate on that. | |
214 | ||
215 | - When we complete a key setup, we replace the data transport peers | |
216 | with those from the key setup. | |
446353cd | 217 | |
f6eff504 | 218 | If we are mobile: |
446353cd | 219 | |
f6eff504 IJ |
220 | - We can't tell when local network setup changes so we can't cache |
221 | the unsupported addrs and completely remove the spurious calls to | |
222 | sendto, but we can optimise things a bit by deprioritising addrs | |
223 | which seem to be unsupported. | |
446353cd | 224 | |
f6eff504 IJ |
225 | - Use only configured addresses. (Except, that if our peer |
226 | initiated a key exchange we use the incoming packet address until | |
227 | our name resolution completes.) | |
446353cd | 228 | |
f6eff504 IJ |
229 | - When we send a packet, try each address in turn; if addr |
230 | supported, put that address to the end of the list for future | |
231 | packets, and go onto the next address. | |
446353cd | 232 | |
f6eff504 IJ |
233 | - When we complete a key setup, we replace the data transport peers |
234 | with those from the key setup. | |
446353cd IJ |
235 | |
236 | */ | |
237 | ||
446353cd IJ |
238 | typedef struct { |
239 | struct timeval last; | |
240 | struct comm_addr addr; | |
241 | } transport_peer; | |
242 | ||
243 | typedef struct { | |
244 | /* configuration information */ | |
245 | /* runtime information */ | |
246 | int npeers; | |
0f27325c | 247 | transport_peer peers[MAX_PEER_ADDRS]; |
446353cd IJ |
248 | } transport_peers; |
249 | ||
8b21a212 | 250 | /* Basic operations on transport peer address sets */ |
446353cd IJ |
251 | static void transport_peers_clear(struct site *st, transport_peers *peers); |
252 | static int transport_peers_valid(transport_peers *peers); | |
253 | static void transport_peers_copy(struct site *st, transport_peers *dst, | |
254 | const transport_peers *src); | |
255 | ||
8b21a212 | 256 | /* Record address of incoming setup packet; resp. data packet. */ |
446353cd IJ |
257 | static void transport_setup_msgok(struct site *st, const struct comm_addr *a); |
258 | static void transport_data_msgok(struct site *st, const struct comm_addr *a); | |
8b21a212 IJ |
259 | |
260 | /* Initialise the setup addresses. Called before we send the first | |
261 | * packet in a key exchange. If we are the initiator, as a result of | |
262 | * resolve completing (or being determined not to be relevant) or an | |
263 | * incoming PROD; if we are the responder, as a result of the MSG1. */ | |
446353cd | 264 | static bool_t transport_compute_setupinit_peers(struct site *st, |
45a14422 IJ |
265 | const struct comm_addr *configured_addrs /* 0 if none or not found */, |
266 | int n_configured_addrs /* 0 if none or not found */, | |
a96fda35 | 267 | const struct comm_addr *incoming_packet_addr /* 0 if none */); |
8b21a212 IJ |
268 | |
269 | /* Called if we are the responder in a key setup, when the resolve | |
270 | * completes. transport_compute_setupinit_peers will hvae been called | |
271 | * earlier. If _complete is called, we are still doing the key setup | |
272 | * (and we should use the new values for both the rest of the key | |
273 | * setup and the ongoing data exchange); if _tardy is called, the key | |
274 | * setup is done (either completed or not) and only the data peers are | |
275 | * relevant */ | |
90d7e3ad | 276 | static void transport_resolve_complete(struct site *st, |
45a14422 | 277 | const struct comm_addr *addrs, int naddrs); |
90d7e3ad | 278 | static void transport_resolve_complete_tardy(struct site *st, |
45a14422 | 279 | const struct comm_addr *addrs, int naddrs); |
446353cd IJ |
280 | |
281 | static void transport_xmit(struct site *st, transport_peers *peers, | |
282 | struct buffer_if *buf, bool_t candebug); | |
283 | ||
284 | /***** END of transport peers declarations *****/ | |
285 | ||
286 | ||
19e9a588 IJ |
287 | struct data_key { |
288 | struct transform_inst_if *transform; | |
289 | uint64_t key_timeout; /* End of life of current key */ | |
290 | uint32_t remote_session_id; | |
291 | }; | |
292 | ||
2fe58dfd SE |
293 | struct site { |
294 | closure_t cl; | |
295 | struct site_if ops; | |
296 | /* configuration information */ | |
297 | string_t localname; | |
298 | string_t remotename; | |
0391d9ee | 299 | bool_t local_mobile, peer_mobile; /* Mobile client support */ |
446353cd | 300 | int32_t transport_peers_max; |
ff05a229 | 301 | string_t tunname; /* localname<->remotename by default, used in logs */ |
83dbdd3f | 302 | cstring_t *addresses; /* DNS name or address(es) for bootstrapping, optional */ |
ff05a229 | 303 | int remoteport; /* Port for bootstrapping, optional */ |
3ed1846a | 304 | uint32_t mtu_target; |
2fe58dfd | 305 | struct netlink_if *netlink; |
59533c16 IJ |
306 | struct comm_if **comms; |
307 | int ncomms; | |
2fe58dfd SE |
308 | struct resolver_if *resolver; |
309 | struct log_if *log; | |
310 | struct random_if *random; | |
311 | struct rsaprivkey_if *privkey; | |
2fe58dfd | 312 | struct rsapubkey_if *pubkey; |
5b5f297f IJ |
313 | struct transform_if **transforms; |
314 | int ntransforms; | |
2fe58dfd SE |
315 | struct dh_if *dh; |
316 | struct hash_if *hash; | |
2fe58dfd | 317 | |
58650a70 | 318 | uint32_t index; /* Index of this site */ |
09a385fb | 319 | uint32_t local_capabilities; |
1caa23ff | 320 | int32_t setup_retries; /* How many times to send setup packets */ |
e7f8ec2a | 321 | int32_t setup_retry_interval; /* Initial timeout for setup packets */ |
4a8aed08 | 322 | int32_t wait_timeout; /* How long to wait if setup unsuccessful */ |
446353cd | 323 | int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */ |
4a8aed08 IJ |
324 | int32_t key_lifetime; /* How long a key lasts once set up */ |
325 | int32_t key_renegotiate_time; /* If we see traffic (or a keepalive) | |
9d3a4132 SE |
326 | after this time, initiate a new |
327 | key exchange */ | |
2fe58dfd | 328 | |
2fe58dfd SE |
329 | bool_t setup_priority; /* Do we have precedence if both sites emit |
330 | message 1 simultaneously? */ | |
331 | uint32_t log_events; | |
332 | ||
333 | /* runtime information */ | |
334 | uint32_t state; | |
335 | uint64_t now; /* Most recently seen time */ | |
dd9209d1 | 336 | bool_t allow_send_prod; |
83dbdd3f IJ |
337 | int resolving_count; |
338 | int resolving_n_results_all; | |
339 | int resolving_n_results_stored; | |
340 | struct comm_addr resolving_results[MAX_PEER_ADDRS]; | |
2fe58dfd | 341 | |
ff05a229 | 342 | /* The currently established session */ |
19e9a588 | 343 | struct data_key current; |
02b0959b | 344 | struct data_key auxiliary_key; |
bd98cd6b | 345 | bool_t auxiliary_is_new; |
ff05a229 | 346 | uint64_t renegotiate_key_time; /* When we can negotiate a new key */ |
bd98cd6b | 347 | uint64_t auxiliary_renegotiate_key_time; |
446353cd | 348 | transport_peers peers; /* Current address(es) of peer for data traffic */ |
2fe58dfd | 349 | |
ff05a229 SE |
350 | /* The current key setup protocol exchange. We can only be |
351 | involved in one of these at a time. There's a potential for | |
352 | denial of service here (the attacker keeps sending a setup | |
353 | packet; we keep trying to continue the exchange, and have to | |
354 | timeout before we can listen for another setup packet); perhaps | |
355 | we should keep a list of 'bad' sources for setup packets. */ | |
09a385fb | 356 | uint32_t remote_capabilities; |
3ed1846a | 357 | uint16_t remote_adv_mtu; |
5b5f297f | 358 | struct transform_if *chosen_transform; |
2fe58dfd | 359 | uint32_t setup_session_id; |
446353cd | 360 | transport_peers setup_peers; |
2fe58dfd SE |
361 | uint8_t localN[NONCELEN]; /* Nonces for key exchange */ |
362 | uint8_t remoteN[NONCELEN]; | |
363 | struct buffer_if buffer; /* Current outgoing key exchange packet */ | |
05f39b4d | 364 | struct buffer_if scratch; |
4a8aed08 | 365 | int32_t retries; /* Number of retries remaining */ |
2fe58dfd SE |
366 | uint64_t timeout; /* Timeout for current state */ |
367 | uint8_t *dhsecret; | |
368 | uint8_t *sharedsecret; | |
5b5f297f | 369 | uint32_t sharedsecretlen, sharedsecretallocd; |
2fe58dfd SE |
370 | struct transform_inst_if *new_transform; /* For key setup/verify */ |
371 | }; | |
372 | ||
8368df34 IJ |
373 | static uint32_t event_log_priority(struct site *st, uint32_t event) |
374 | { | |
375 | if (!(event&st->log_events)) | |
376 | return 0; | |
377 | switch(event) { | |
378 | case LOG_UNEXPECTED: return M_INFO; | |
379 | case LOG_SETUP_INIT: return M_INFO; | |
380 | case LOG_SETUP_TIMEOUT: return M_NOTICE; | |
381 | case LOG_ACTIVATE_KEY: return M_INFO; | |
382 | case LOG_TIMEOUT_KEY: return M_INFO; | |
383 | case LOG_SEC: return M_SECURITY; | |
384 | case LOG_STATE: return M_DEBUG; | |
385 | case LOG_DROP: return M_DEBUG; | |
386 | case LOG_DUMP: return M_DEBUG; | |
387 | case LOG_ERROR: return M_ERR; | |
388 | case LOG_PEER_ADDRS: return M_DEBUG; | |
389 | default: return M_ERR; | |
390 | } | |
391 | } | |
392 | ||
0237c848 IJ |
393 | static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap) |
394 | FORMAT(printf,3,0); | |
395 | static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap) | |
2fe58dfd | 396 | { |
b2a56f7c | 397 | uint32_t class; |
2fe58dfd | 398 | |
8368df34 IJ |
399 | class=event_log_priority(st, event); |
400 | if (class) { | |
e5d8c16e IJ |
401 | slilog_part(st->log,class,"%s: ",st->tunname); |
402 | vslilog_part(st->log,class,msg,ap); | |
403 | slilog_part(st->log,class,"\n"); | |
2fe58dfd | 404 | } |
2fe58dfd SE |
405 | } |
406 | ||
0237c848 IJ |
407 | static void slog(struct site *st, uint32_t event, cstring_t msg, ...) |
408 | FORMAT(printf,3,4); | |
409 | static void slog(struct site *st, uint32_t event, cstring_t msg, ...) | |
410 | { | |
411 | va_list ap; | |
412 | va_start(ap,msg); | |
413 | vslog(st,event,msg,ap); | |
414 | va_end(ap); | |
415 | } | |
416 | ||
4f3c75ac IJ |
417 | static void logtimeout(struct site *st, const char *fmt, ...) |
418 | FORMAT(printf,2,3); | |
419 | static void logtimeout(struct site *st, const char *fmt, ...) | |
420 | { | |
e9c9020e IJ |
421 | uint32_t class=event_log_priority(st,LOG_SETUP_TIMEOUT); |
422 | if (!class) | |
423 | return; | |
424 | ||
4f3c75ac IJ |
425 | va_list ap; |
426 | va_start(ap,fmt); | |
e9c9020e IJ |
427 | |
428 | slilog_part(st->log,class,"%s: ",st->tunname); | |
429 | vslilog_part(st->log,class,fmt,ap); | |
430 | ||
431 | const char *delim; | |
432 | int i; | |
433 | for (i=0, delim=" (tried "; | |
434 | i<st->setup_peers.npeers; | |
435 | i++, delim=", ") { | |
436 | transport_peer *peer=&st->setup_peers.peers[i]; | |
437 | const char *s=comm_addr_to_string(&peer->addr); | |
438 | slilog_part(st->log,class,"%s%s",delim,s); | |
439 | } | |
440 | ||
441 | slilog_part(st->log,class,")\n"); | |
4f3c75ac IJ |
442 | va_end(ap); |
443 | } | |
444 | ||
9d3a4132 | 445 | static void set_link_quality(struct site *st); |
1d388569 IJ |
446 | static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel); |
447 | static void delete_one_key(struct site *st, struct data_key *key, | |
448 | const char *reason /* may be 0 meaning don't log*/, | |
449 | const char *which /* ignored if !reasonn */, | |
450 | uint32_t loglevel /* ignored if !reasonn */); | |
dd9209d1 IJ |
451 | static bool_t initiate_key_setup(struct site *st, cstring_t reason, |
452 | const struct comm_addr *prod_hint); | |
2fe58dfd SE |
453 | static void enter_state_run(struct site *st); |
454 | static bool_t enter_state_resolve(struct site *st); | |
83dbdd3f | 455 | static void decrement_resolving_count(struct site *st, int by); |
ff05a229 | 456 | static bool_t enter_new_state(struct site *st,uint32_t next); |
2fe58dfd | 457 | static void enter_state_wait(struct site *st); |
05f39b4d | 458 | static void activate_new_key(struct site *st); |
2fe58dfd | 459 | |
0afd257e IJ |
460 | static bool_t is_transform_valid(struct transform_inst_if *transform) |
461 | { | |
fcad4b0b | 462 | return transform && transform->valid(transform->st); |
0afd257e IJ |
463 | } |
464 | ||
3d8d8f4e IJ |
465 | static bool_t current_valid(struct site *st) |
466 | { | |
0afd257e IJ |
467 | return is_transform_valid(st->current.transform); |
468 | } | |
469 | ||
470 | #define DEFINE_CALL_TRANSFORM(fwdrev) \ | |
471 | static int call_transform_##fwdrev(struct site *st, \ | |
472 | struct transform_inst_if *transform, \ | |
473 | struct buffer_if *buf, \ | |
474 | const char **errmsg) \ | |
475 | { \ | |
fcad4b0b IJ |
476 | if (!is_transform_valid(transform)) { \ |
477 | *errmsg="transform not set up"; \ | |
478 | return 1; \ | |
479 | } \ | |
0afd257e | 480 | return transform->fwdrev(transform->st,buf,errmsg); \ |
3d8d8f4e IJ |
481 | } |
482 | ||
0afd257e IJ |
483 | DEFINE_CALL_TRANSFORM(forwards) |
484 | DEFINE_CALL_TRANSFORM(reverse) | |
485 | ||
486 | static void dispose_transform(struct transform_inst_if **transform_var) | |
487 | { | |
0afd257e | 488 | struct transform_inst_if *transform=*transform_var; |
fcad4b0b IJ |
489 | if (transform) { |
490 | transform->delkey(transform->st); | |
491 | transform->destroy(transform->st); | |
492 | } | |
493 | *transform_var = 0; | |
0afd257e IJ |
494 | } |
495 | ||
2fe58dfd SE |
496 | #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) |
497 | #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) | |
498 | #define CHECK_TYPE(b,t) do { uint32_t type; \ | |
499 | CHECK_AVAIL((b),4); \ | |
59635212 | 500 | type=buf_unprepend_uint32((b)); \ |
2fe58dfd SE |
501 | if (type!=(t)) return False; } while(0) |
502 | ||
3ed1846a IJ |
503 | static _Bool type_is_msg34(uint32_t type) |
504 | { | |
505 | return | |
506 | type == LABEL_MSG3 || | |
507 | type == LABEL_MSG3BIS || | |
508 | type == LABEL_MSG4; | |
509 | } | |
510 | ||
1737eeef IJ |
511 | struct parsedname { |
512 | int32_t len; | |
513 | uint8_t *name; | |
09a385fb | 514 | struct buffer_if extrainfo; |
1737eeef IJ |
515 | }; |
516 | ||
2fe58dfd SE |
517 | struct msg { |
518 | uint8_t *hashstart; | |
519 | uint32_t dest; | |
520 | uint32_t source; | |
1737eeef IJ |
521 | struct parsedname remote; |
522 | struct parsedname local; | |
09a385fb | 523 | uint32_t remote_capabilities; |
3ed1846a | 524 | uint16_t remote_mtu; |
5b5f297f | 525 | int capab_transformnum; |
2fe58dfd SE |
526 | uint8_t *nR; |
527 | uint8_t *nL; | |
1caa23ff | 528 | int32_t pklen; |
3e8addad | 529 | char *pk; |
1caa23ff IJ |
530 | int32_t hashlen; |
531 | int32_t siglen; | |
3e8addad | 532 | char *sig; |
2fe58dfd SE |
533 | }; |
534 | ||
5b5f297f | 535 | static void set_new_transform(struct site *st, char *pk) |
0afd257e | 536 | { |
5b5f297f IJ |
537 | /* Make room for the shared key */ |
538 | st->sharedsecretlen=st->chosen_transform->keylen?:st->dh->ceil_len; | |
539 | assert(st->sharedsecretlen); | |
540 | if (st->sharedsecretlen > st->sharedsecretallocd) { | |
541 | st->sharedsecretallocd=st->sharedsecretlen; | |
c921f0c5 IJ |
542 | st->sharedsecret=safe_realloc_ary(st->sharedsecret,1, |
543 | st->sharedsecretallocd, | |
544 | "site:sharedsecret"); | |
5b5f297f | 545 | } |
5b5f297f IJ |
546 | |
547 | /* Generate the shared key */ | |
548 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,pk, | |
549 | st->sharedsecret,st->sharedsecretlen); | |
550 | ||
551 | /* Set up the transform */ | |
552 | struct transform_if *generator=st->chosen_transform; | |
fcad4b0b IJ |
553 | struct transform_inst_if *generated=generator->create(generator->st); |
554 | generated->setkey(generated->st,st->sharedsecret, | |
555 | st->sharedsecretlen,st->setup_priority); | |
556 | dispose_transform(&st->new_transform); | |
557 | st->new_transform=generated; | |
5b5f297f IJ |
558 | |
559 | slog(st,LOG_SETUP_INIT,"key exchange negotiated transform" | |
560 | " %d (capabilities ours=%#"PRIx32" theirs=%#"PRIx32")", | |
561 | st->chosen_transform->capab_transformnum, | |
562 | st->local_capabilities, st->remote_capabilities); | |
0afd257e IJ |
563 | } |
564 | ||
09a385fb IJ |
565 | struct xinfoadd { |
566 | int32_t lenpos, afternul; | |
567 | }; | |
568 | static void append_string_xinfo_start(struct buffer_if *buf, | |
569 | struct xinfoadd *xia, | |
570 | const char *str) | |
571 | /* Helps construct one of the names with additional info as found | |
572 | * in MSG1..4. Call this function first, then append all the | |
573 | * desired extra info (not including the nul byte) to the buffer, | |
574 | * then call append_string_xinfo_done. */ | |
575 | { | |
576 | xia->lenpos = buf->size; | |
577 | buf_append_string(buf,str); | |
578 | buf_append_uint8(buf,0); | |
579 | xia->afternul = buf->size; | |
580 | } | |
581 | static void append_string_xinfo_done(struct buffer_if *buf, | |
582 | struct xinfoadd *xia) | |
583 | { | |
584 | /* we just need to adjust the string length */ | |
585 | if (buf->size == xia->afternul) { | |
586 | /* no extra info, strip the nul too */ | |
587 | buf_unappend_uint8(buf); | |
588 | } else { | |
589 | put_uint16(buf->start+xia->lenpos, buf->size-(xia->lenpos+2)); | |
590 | } | |
591 | } | |
592 | ||
ff05a229 SE |
593 | /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside |
594 | out using a transform of config data supplied by netlink */ | |
fe5e9cc4 | 595 | static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what) |
2fe58dfd SE |
596 | { |
597 | void *hst; | |
3b83c932 | 598 | uint8_t *hash; |
2fe58dfd SE |
599 | string_t dhpub, sig; |
600 | ||
601 | st->retries=st->setup_retries; | |
602 | BUF_ALLOC(&st->buffer,what); | |
603 | buffer_init(&st->buffer,0); | |
59635212 SE |
604 | buf_append_uint32(&st->buffer, |
605 | (type==LABEL_MSG1?0:st->setup_session_id)); | |
58650a70 | 606 | buf_append_uint32(&st->buffer,st->index); |
59635212 | 607 | buf_append_uint32(&st->buffer,type); |
09a385fb IJ |
608 | |
609 | struct xinfoadd xia; | |
610 | append_string_xinfo_start(&st->buffer,&xia,st->localname); | |
611 | if ((st->local_capabilities & CAPAB_EARLY) || (type != LABEL_MSG1)) { | |
612 | buf_append_uint32(&st->buffer,st->local_capabilities); | |
613 | } | |
3ed1846a IJ |
614 | if (type_is_msg34(type)) { |
615 | buf_append_uint16(&st->buffer,st->mtu_target); | |
616 | } | |
09a385fb IJ |
617 | append_string_xinfo_done(&st->buffer,&xia); |
618 | ||
2fe58dfd | 619 | buf_append_string(&st->buffer,st->remotename); |
4f28e77e | 620 | BUF_ADD_OBJ(append,&st->buffer,st->localN); |
2fe58dfd | 621 | if (type==LABEL_MSG1) return True; |
4f28e77e | 622 | BUF_ADD_OBJ(append,&st->buffer,st->remoteN); |
2fe58dfd | 623 | if (type==LABEL_MSG2) return True; |
3b83c932 SE |
624 | |
625 | if (hacky_par_mid_failnow()) return False; | |
626 | ||
5b5f297f IJ |
627 | if (type==LABEL_MSG3BIS) |
628 | buf_append_uint8(&st->buffer,st->chosen_transform->capab_transformnum); | |
629 | ||
2fe58dfd SE |
630 | dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); |
631 | buf_append_string(&st->buffer,dhpub); | |
632 | free(dhpub); | |
3b83c932 | 633 | hash=safe_malloc(st->hash->len, "generate_msg"); |
2fe58dfd SE |
634 | hst=st->hash->init(); |
635 | st->hash->update(hst,st->buffer.start,st->buffer.size); | |
636 | st->hash->final(hst,hash); | |
637 | sig=st->privkey->sign(st->privkey->st,hash,st->hash->len); | |
638 | buf_append_string(&st->buffer,sig); | |
639 | free(sig); | |
3b83c932 | 640 | free(hash); |
2fe58dfd SE |
641 | return True; |
642 | } | |
643 | ||
1737eeef IJ |
644 | static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm) |
645 | { | |
646 | CHECK_AVAIL(msg,2); | |
647 | nm->len=buf_unprepend_uint16(msg); | |
648 | CHECK_AVAIL(msg,nm->len); | |
649 | nm->name=buf_unprepend(msg,nm->len); | |
650 | uint8_t *nul=memchr(nm->name,0,nm->len); | |
651 | if (!nul) { | |
09a385fb | 652 | buffer_readonly_view(&nm->extrainfo,0,0); |
1737eeef | 653 | } else { |
09a385fb | 654 | buffer_readonly_view(&nm->extrainfo, nul+1, msg->start-(nul+1)); |
1737eeef IJ |
655 | nm->len=nul-nm->name; |
656 | } | |
657 | return True; | |
658 | } | |
659 | ||
2fe58dfd SE |
660 | static bool_t unpick_msg(struct site *st, uint32_t type, |
661 | struct buffer_if *msg, struct msg *m) | |
662 | { | |
5b5f297f | 663 | m->capab_transformnum=-1; |
2fe58dfd SE |
664 | m->hashstart=msg->start; |
665 | CHECK_AVAIL(msg,4); | |
59635212 | 666 | m->dest=buf_unprepend_uint32(msg); |
2fe58dfd | 667 | CHECK_AVAIL(msg,4); |
59635212 | 668 | m->source=buf_unprepend_uint32(msg); |
2fe58dfd | 669 | CHECK_TYPE(msg,type); |
1737eeef | 670 | if (!unpick_name(msg,&m->remote)) return False; |
09a385fb | 671 | m->remote_capabilities=0; |
3ed1846a | 672 | m->remote_mtu=0; |
09a385fb IJ |
673 | if (m->remote.extrainfo.size) { |
674 | CHECK_AVAIL(&m->remote.extrainfo,4); | |
675 | m->remote_capabilities=buf_unprepend_uint32(&m->remote.extrainfo); | |
676 | } | |
3ed1846a IJ |
677 | if (type_is_msg34(type) && m->remote.extrainfo.size) { |
678 | CHECK_AVAIL(&m->remote.extrainfo,2); | |
679 | m->remote_mtu=buf_unprepend_uint16(&m->remote.extrainfo); | |
680 | } | |
1737eeef | 681 | if (!unpick_name(msg,&m->local)) return False; |
dd9209d1 IJ |
682 | if (type==LABEL_PROD) { |
683 | CHECK_EMPTY(msg); | |
684 | return True; | |
685 | } | |
2fe58dfd SE |
686 | CHECK_AVAIL(msg,NONCELEN); |
687 | m->nR=buf_unprepend(msg,NONCELEN); | |
688 | if (type==LABEL_MSG1) { | |
689 | CHECK_EMPTY(msg); | |
690 | return True; | |
691 | } | |
692 | CHECK_AVAIL(msg,NONCELEN); | |
693 | m->nL=buf_unprepend(msg,NONCELEN); | |
694 | if (type==LABEL_MSG2) { | |
695 | CHECK_EMPTY(msg); | |
696 | return True; | |
697 | } | |
5b5f297f IJ |
698 | if (type==LABEL_MSG3BIS) { |
699 | CHECK_AVAIL(msg,1); | |
700 | m->capab_transformnum = buf_unprepend_uint8(msg); | |
701 | } else { | |
702 | m->capab_transformnum = CAPAB_TRANSFORMNUM_ANCIENT; | |
703 | } | |
2fe58dfd | 704 | CHECK_AVAIL(msg,2); |
59635212 | 705 | m->pklen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
706 | CHECK_AVAIL(msg,m->pklen); |
707 | m->pk=buf_unprepend(msg,m->pklen); | |
708 | m->hashlen=msg->start-m->hashstart; | |
709 | CHECK_AVAIL(msg,2); | |
59635212 | 710 | m->siglen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
711 | CHECK_AVAIL(msg,m->siglen); |
712 | m->sig=buf_unprepend(msg,m->siglen); | |
713 | CHECK_EMPTY(msg); | |
714 | return True; | |
715 | } | |
716 | ||
1737eeef IJ |
717 | static bool_t name_matches(const struct parsedname *nm, const char *expected) |
718 | { | |
719 | int expected_len=strlen(expected); | |
720 | return | |
721 | nm->len == expected_len && | |
722 | !memcmp(nm->name, expected, expected_len); | |
723 | } | |
724 | ||
ff05a229 | 725 | static bool_t check_msg(struct site *st, uint32_t type, struct msg *m, |
fe5e9cc4 | 726 | cstring_t *error) |
ff05a229 SE |
727 | { |
728 | if (type==LABEL_MSG1) return True; | |
729 | ||
730 | /* Check that the site names and our nonce have been sent | |
731 | back correctly, and then store our peer's nonce. */ | |
1737eeef | 732 | if (!name_matches(&m->remote,st->remotename)) { |
ff05a229 SE |
733 | *error="wrong remote site name"; |
734 | return False; | |
735 | } | |
1737eeef | 736 | if (!name_matches(&m->local,st->localname)) { |
ff05a229 SE |
737 | *error="wrong local site name"; |
738 | return False; | |
739 | } | |
740 | if (memcmp(m->nL,st->localN,NONCELEN)!=0) { | |
741 | *error="wrong locally-generated nonce"; | |
742 | return False; | |
743 | } | |
744 | if (type==LABEL_MSG2) return True; | |
5ad34db2 | 745 | if (!consttime_memeq(m->nR,st->remoteN,NONCELEN)!=0) { |
ff05a229 SE |
746 | *error="wrong remotely-generated nonce"; |
747 | return False; | |
748 | } | |
09a385fb IJ |
749 | /* MSG3 has complicated rules about capabilities, which are |
750 | * handled in process_msg3. */ | |
5b5f297f | 751 | if (type==LABEL_MSG3 || type==LABEL_MSG3BIS) return True; |
09a385fb IJ |
752 | if (m->remote_capabilities!=st->remote_capabilities) { |
753 | *error="remote capabilities changed"; | |
754 | return False; | |
755 | } | |
ff05a229 SE |
756 | if (type==LABEL_MSG4) return True; |
757 | *error="unknown message type"; | |
758 | return False; | |
759 | } | |
760 | ||
2fe58dfd SE |
761 | static bool_t generate_msg1(struct site *st) |
762 | { | |
763 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
764 | return generate_msg(st,LABEL_MSG1,"site:MSG1"); | |
765 | } | |
766 | ||
767 | static bool_t process_msg1(struct site *st, struct buffer_if *msg1, | |
7e29719e | 768 | const struct comm_addr *src, struct msg *m) |
2fe58dfd | 769 | { |
2fe58dfd SE |
770 | /* We've already determined we're in an appropriate state to |
771 | process an incoming MSG1, and that the MSG1 has correct values | |
772 | of A and B. */ | |
773 | ||
7e29719e | 774 | st->setup_session_id=m->source; |
09a385fb | 775 | st->remote_capabilities=m->remote_capabilities; |
7e29719e | 776 | memcpy(st->remoteN,m->nR,NONCELEN); |
2fe58dfd SE |
777 | return True; |
778 | } | |
779 | ||
780 | static bool_t generate_msg2(struct site *st) | |
781 | { | |
782 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
783 | return generate_msg(st,LABEL_MSG2,"site:MSG2"); | |
784 | } | |
785 | ||
786 | static bool_t process_msg2(struct site *st, struct buffer_if *msg2, | |
a15faeb2 | 787 | const struct comm_addr *src) |
2fe58dfd SE |
788 | { |
789 | struct msg m; | |
fe5e9cc4 | 790 | cstring_t err; |
2fe58dfd SE |
791 | |
792 | if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False; | |
ff05a229 SE |
793 | if (!check_msg(st,LABEL_MSG2,&m,&err)) { |
794 | slog(st,LOG_SEC,"msg2: %s",err); | |
2fe58dfd SE |
795 | return False; |
796 | } | |
797 | st->setup_session_id=m.source; | |
09a385fb | 798 | st->remote_capabilities=m.remote_capabilities; |
5b5f297f IJ |
799 | |
800 | /* Select the transform to use */ | |
801 | ||
802 | uint32_t remote_transforms = st->remote_capabilities & CAPAB_TRANSFORM_MASK; | |
803 | if (!remote_transforms) | |
804 | /* old secnets only had this one transform */ | |
805 | remote_transforms = 1UL << CAPAB_TRANSFORMNUM_ANCIENT; | |
806 | ||
807 | struct transform_if *ti; | |
808 | int i; | |
809 | for (i=0; i<st->ntransforms; i++) { | |
810 | ti=st->transforms[i]; | |
811 | if ((1UL << ti->capab_transformnum) & remote_transforms) | |
812 | goto transform_found; | |
813 | } | |
814 | slog(st,LOG_ERROR,"no transforms in common" | |
815 | " (us %#"PRIx32"; them: %#"PRIx32")", | |
816 | st->local_capabilities & CAPAB_TRANSFORM_MASK, | |
817 | remote_transforms); | |
818 | return False; | |
819 | transform_found: | |
820 | st->chosen_transform=ti; | |
821 | ||
2fe58dfd SE |
822 | memcpy(st->remoteN,m.nR,NONCELEN); |
823 | return True; | |
824 | } | |
825 | ||
826 | static bool_t generate_msg3(struct site *st) | |
827 | { | |
828 | /* Now we have our nonce and their nonce. Think of a secret key, | |
829 | and create message number 3. */ | |
830 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
5b5f297f IJ |
831 | return generate_msg(st, |
832 | (st->remote_capabilities & CAPAB_TRANSFORM_MASK | |
833 | ? LABEL_MSG3BIS : LABEL_MSG3), | |
834 | "site:MSG3"); | |
2fe58dfd SE |
835 | } |
836 | ||
e001e8c0 IJ |
837 | static bool_t process_msg3_msg4(struct site *st, struct msg *m) |
838 | { | |
839 | uint8_t *hash; | |
840 | void *hst; | |
841 | ||
842 | /* Check signature and store g^x mod m */ | |
843 | hash=safe_malloc(st->hash->len, "process_msg3_msg4"); | |
844 | hst=st->hash->init(); | |
845 | st->hash->update(hst,m->hashstart,m->hashlen); | |
846 | st->hash->final(hst,hash); | |
847 | /* Terminate signature with a '0' - cheating, but should be ok */ | |
848 | m->sig[m->siglen]=0; | |
849 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m->sig)) { | |
850 | slog(st,LOG_SEC,"msg3/msg4 signature failed check!"); | |
851 | free(hash); | |
852 | return False; | |
853 | } | |
854 | free(hash); | |
855 | ||
3ed1846a IJ |
856 | st->remote_adv_mtu=m->remote_mtu; |
857 | ||
e001e8c0 IJ |
858 | return True; |
859 | } | |
860 | ||
2fe58dfd | 861 | static bool_t process_msg3(struct site *st, struct buffer_if *msg3, |
5b5f297f | 862 | const struct comm_addr *src, uint32_t msgtype) |
2fe58dfd SE |
863 | { |
864 | struct msg m; | |
fe5e9cc4 | 865 | cstring_t err; |
2fe58dfd | 866 | |
5b5f297f IJ |
867 | assert(msgtype==LABEL_MSG3 || msgtype==LABEL_MSG3BIS); |
868 | ||
869 | if (!unpick_msg(st,msgtype,msg3,&m)) return False; | |
870 | if (!check_msg(st,msgtype,&m,&err)) { | |
ff05a229 | 871 | slog(st,LOG_SEC,"msg3: %s",err); |
2fe58dfd SE |
872 | return False; |
873 | } | |
09a385fb IJ |
874 | uint32_t capab_adv_late = m.remote_capabilities |
875 | & ~st->remote_capabilities & CAPAB_EARLY; | |
876 | if (capab_adv_late) { | |
877 | slog(st,LOG_SEC,"msg3 impermissibly adds early capability flag(s)" | |
878 | " %#"PRIx32" (was %#"PRIx32", now %#"PRIx32")", | |
879 | capab_adv_late, st->remote_capabilities, m.remote_capabilities); | |
880 | return False; | |
881 | } | |
882 | st->remote_capabilities|=m.remote_capabilities; | |
ff05a229 | 883 | |
5b5f297f IJ |
884 | struct transform_if *ti; |
885 | int i; | |
886 | for (i=0; i<st->ntransforms; i++) { | |
887 | ti=st->transforms[i]; | |
888 | if (ti->capab_transformnum == m.capab_transformnum) | |
889 | goto transform_found; | |
890 | } | |
891 | slog(st,LOG_SEC,"peer chose unknown-to-us transform %d!", | |
892 | m.capab_transformnum); | |
893 | return False; | |
894 | transform_found: | |
895 | st->chosen_transform=ti; | |
896 | ||
e001e8c0 | 897 | if (!process_msg3_msg4(st,&m)) |
2fe58dfd | 898 | return False; |
2fe58dfd SE |
899 | |
900 | /* Terminate their DH public key with a '0' */ | |
901 | m.pk[m.pklen]=0; | |
902 | /* Invent our DH secret key */ | |
903 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
904 | ||
5b5f297f IJ |
905 | /* Generate the shared key and set up the transform */ |
906 | set_new_transform(st,m.pk); | |
2fe58dfd SE |
907 | |
908 | return True; | |
909 | } | |
910 | ||
911 | static bool_t generate_msg4(struct site *st) | |
912 | { | |
913 | /* We have both nonces, their public key and our private key. Generate | |
914 | our public key, sign it and send it to them. */ | |
915 | return generate_msg(st,LABEL_MSG4,"site:MSG4"); | |
916 | } | |
917 | ||
918 | static bool_t process_msg4(struct site *st, struct buffer_if *msg4, | |
a15faeb2 | 919 | const struct comm_addr *src) |
2fe58dfd SE |
920 | { |
921 | struct msg m; | |
fe5e9cc4 | 922 | cstring_t err; |
2fe58dfd SE |
923 | |
924 | if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False; | |
ff05a229 SE |
925 | if (!check_msg(st,LABEL_MSG4,&m,&err)) { |
926 | slog(st,LOG_SEC,"msg4: %s",err); | |
2fe58dfd SE |
927 | return False; |
928 | } | |
929 | ||
e001e8c0 | 930 | if (!process_msg3_msg4(st,&m)) |
2fe58dfd | 931 | return False; |
2fe58dfd SE |
932 | |
933 | /* Terminate their DH public key with a '0' */ | |
934 | m.pk[m.pklen]=0; | |
5b5f297f IJ |
935 | |
936 | /* Generate the shared key and set up the transform */ | |
937 | set_new_transform(st,m.pk); | |
2fe58dfd SE |
938 | |
939 | return True; | |
940 | } | |
941 | ||
2fe58dfd SE |
942 | struct msg0 { |
943 | uint32_t dest; | |
944 | uint32_t source; | |
945 | uint32_t type; | |
946 | }; | |
947 | ||
948 | static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0, | |
949 | struct msg0 *m) | |
950 | { | |
951 | CHECK_AVAIL(msg0,4); | |
59635212 | 952 | m->dest=buf_unprepend_uint32(msg0); |
2fe58dfd | 953 | CHECK_AVAIL(msg0,4); |
59635212 | 954 | m->source=buf_unprepend_uint32(msg0); |
2fe58dfd | 955 | CHECK_AVAIL(msg0,4); |
59635212 | 956 | m->type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
957 | return True; |
958 | /* Leaves transformed part of buffer untouched */ | |
959 | } | |
960 | ||
ff05a229 SE |
961 | static bool_t generate_msg5(struct site *st) |
962 | { | |
fe5e9cc4 | 963 | cstring_t transform_err; |
ff05a229 SE |
964 | |
965 | BUF_ALLOC(&st->buffer,"site:MSG5"); | |
966 | /* We are going to add four words to the message */ | |
3abd18e8 | 967 | buffer_init(&st->buffer,calculate_max_start_pad()); |
ff05a229 SE |
968 | /* Give the netlink code an opportunity to put its own stuff in the |
969 | message (configuration information, etc.) */ | |
ff05a229 | 970 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
0afd257e IJ |
971 | if (call_transform_forwards(st,st->new_transform, |
972 | &st->buffer,&transform_err)) | |
973 | return False; | |
ff05a229 | 974 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
58650a70 | 975 | buf_prepend_uint32(&st->buffer,st->index); |
ff05a229 SE |
976 | buf_prepend_uint32(&st->buffer,st->setup_session_id); |
977 | ||
978 | st->retries=st->setup_retries; | |
979 | return True; | |
980 | } | |
981 | ||
2fe58dfd | 982 | static bool_t process_msg5(struct site *st, struct buffer_if *msg5, |
c90cc2a7 IJ |
983 | const struct comm_addr *src, |
984 | struct transform_inst_if *transform) | |
2fe58dfd SE |
985 | { |
986 | struct msg0 m; | |
fe5e9cc4 | 987 | cstring_t transform_err; |
2fe58dfd SE |
988 | |
989 | if (!unpick_msg0(st,msg5,&m)) return False; | |
990 | ||
0afd257e | 991 | if (call_transform_reverse(st,transform,msg5,&transform_err)) { |
2fe58dfd | 992 | /* There's a problem */ |
59635212 | 993 | slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err); |
2fe58dfd SE |
994 | return False; |
995 | } | |
996 | /* Buffer should now contain untransformed PING packet data */ | |
997 | CHECK_AVAIL(msg5,4); | |
59635212 | 998 | if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) { |
ff05a229 | 999 | slog(st,LOG_SEC,"MSG5/PING packet contained wrong label"); |
2fe58dfd SE |
1000 | return False; |
1001 | } | |
ff7cdc9e IJ |
1002 | /* Older versions of secnet used to write some config data here |
1003 | * which we ignore. So we don't CHECK_EMPTY */ | |
2fe58dfd SE |
1004 | return True; |
1005 | } | |
1006 | ||
c90cc2a7 IJ |
1007 | static void create_msg6(struct site *st, struct transform_inst_if *transform, |
1008 | uint32_t session_id) | |
2fe58dfd | 1009 | { |
fe5e9cc4 | 1010 | cstring_t transform_err; |
2fe58dfd SE |
1011 | |
1012 | BUF_ALLOC(&st->buffer,"site:MSG6"); | |
ff05a229 | 1013 | /* We are going to add four words to the message */ |
3abd18e8 | 1014 | buffer_init(&st->buffer,calculate_max_start_pad()); |
794f2398 SE |
1015 | /* Give the netlink code an opportunity to put its own stuff in the |
1016 | message (configuration information, etc.) */ | |
ff05a229 | 1017 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
0afd257e IJ |
1018 | int problem = call_transform_forwards(st,transform, |
1019 | &st->buffer,&transform_err); | |
1020 | assert(!problem); | |
59635212 | 1021 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
58650a70 | 1022 | buf_prepend_uint32(&st->buffer,st->index); |
c90cc2a7 IJ |
1023 | buf_prepend_uint32(&st->buffer,session_id); |
1024 | } | |
2fe58dfd | 1025 | |
c90cc2a7 IJ |
1026 | static bool_t generate_msg6(struct site *st) |
1027 | { | |
0afd257e IJ |
1028 | if (!is_transform_valid(st->new_transform)) |
1029 | return False; | |
c90cc2a7 | 1030 | create_msg6(st,st->new_transform,st->setup_session_id); |
ff05a229 | 1031 | st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */ |
2fe58dfd SE |
1032 | return True; |
1033 | } | |
1034 | ||
1035 | static bool_t process_msg6(struct site *st, struct buffer_if *msg6, | |
a15faeb2 | 1036 | const struct comm_addr *src) |
2fe58dfd SE |
1037 | { |
1038 | struct msg0 m; | |
fe5e9cc4 | 1039 | cstring_t transform_err; |
2fe58dfd SE |
1040 | |
1041 | if (!unpick_msg0(st,msg6,&m)) return False; | |
1042 | ||
0afd257e | 1043 | if (call_transform_reverse(st,st->new_transform,msg6,&transform_err)) { |
2fe58dfd | 1044 | /* There's a problem */ |
59635212 | 1045 | slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err); |
2fe58dfd SE |
1046 | return False; |
1047 | } | |
1048 | /* Buffer should now contain untransformed PING packet data */ | |
1049 | CHECK_AVAIL(msg6,4); | |
59635212 SE |
1050 | if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) { |
1051 | slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data"); | |
2fe58dfd SE |
1052 | return False; |
1053 | } | |
ff7cdc9e IJ |
1054 | /* Older versions of secnet used to write some config data here |
1055 | * which we ignore. So we don't CHECK_EMPTY */ | |
2fe58dfd SE |
1056 | return True; |
1057 | } | |
1058 | ||
48b97423 IJ |
1059 | static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0, |
1060 | const struct comm_addr *src) | |
2fe58dfd | 1061 | { |
02b0959b | 1062 | cstring_t transform_err, auxkey_err, newkey_err="n/a"; |
065e1922 IJ |
1063 | struct msg0 m; |
1064 | uint32_t problem; | |
2fe58dfd | 1065 | |
2fe58dfd SE |
1066 | if (!unpick_msg0(st,msg0,&m)) return False; |
1067 | ||
05f39b4d IJ |
1068 | /* Keep a copy so we can try decrypting it with multiple keys */ |
1069 | buffer_copy(&st->scratch, msg0); | |
1070 | ||
0afd257e IJ |
1071 | problem = call_transform_reverse(st,st->current.transform, |
1072 | msg0,&transform_err); | |
02b0959b | 1073 | if (!problem) { |
bd98cd6b IJ |
1074 | if (!st->auxiliary_is_new) |
1075 | delete_one_key(st,&st->auxiliary_key, | |
1076 | "peer has used new key","auxiliary key",LOG_SEC); | |
02b0959b IJ |
1077 | return True; |
1078 | } | |
48b97423 IJ |
1079 | if (problem==2) |
1080 | goto skew; | |
07e4774c | 1081 | |
02b0959b | 1082 | buffer_copy(msg0, &st->scratch); |
fcad4b0b IJ |
1083 | problem = call_transform_reverse(st,st->auxiliary_key.transform, |
1084 | msg0,&auxkey_err); | |
02b0959b IJ |
1085 | if (problem==0) { |
1086 | slog(st,LOG_DROP,"processing packet which uses auxiliary key"); | |
bd98cd6b IJ |
1087 | if (st->auxiliary_is_new) { |
1088 | /* We previously timed out in state SENTMSG5 but it turns | |
1089 | * out that our peer did in fact get our MSG5 and is | |
1090 | * using the new key. So we should switch to it too. */ | |
1091 | /* This is a bit like activate_new_key. */ | |
1092 | struct data_key t; | |
1093 | t=st->current; | |
1094 | st->current=st->auxiliary_key; | |
1095 | st->auxiliary_key=t; | |
1096 | ||
1097 | delete_one_key(st,&st->auxiliary_key,"peer has used new key", | |
1098 | "previous key",LOG_SEC); | |
1099 | st->auxiliary_is_new=0; | |
1100 | st->renegotiate_key_time=st->auxiliary_renegotiate_key_time; | |
1101 | } | |
02b0959b IJ |
1102 | return True; |
1103 | } | |
48b97423 IJ |
1104 | if (problem==2) |
1105 | goto skew; | |
02b0959b | 1106 | |
05f39b4d IJ |
1107 | if (st->state==SITE_SENTMSG5) { |
1108 | buffer_copy(msg0, &st->scratch); | |
0afd257e IJ |
1109 | problem = call_transform_reverse(st,st->new_transform, |
1110 | msg0,&newkey_err); | |
48b97423 | 1111 | if (!problem) { |
05f39b4d IJ |
1112 | /* It looks like we didn't get the peer's MSG6 */ |
1113 | /* This is like a cut-down enter_new_state(SITE_RUN) */ | |
1114 | slog(st,LOG_STATE,"will enter state RUN (MSG0 with new key)"); | |
1115 | BUF_FREE(&st->buffer); | |
1116 | st->timeout=0; | |
1117 | activate_new_key(st); | |
1118 | return True; /* do process the data in this packet */ | |
1119 | } | |
48b97423 IJ |
1120 | if (problem==2) |
1121 | goto skew; | |
05f39b4d IJ |
1122 | } |
1123 | ||
02b0959b IJ |
1124 | slog(st,LOG_SEC,"transform: %s (aux: %s, new: %s)", |
1125 | transform_err,auxkey_err,newkey_err); | |
dd9209d1 | 1126 | initiate_key_setup(st,"incoming message would not decrypt",0); |
48b97423 IJ |
1127 | send_nak(src,m.dest,m.source,m.type,msg0,"message would not decrypt"); |
1128 | return False; | |
1129 | ||
1130 | skew: | |
1131 | slog(st,LOG_DROP,"transform: %s (merely skew)",transform_err); | |
065e1922 IJ |
1132 | return False; |
1133 | } | |
1134 | ||
1135 | static bool_t process_msg0(struct site *st, struct buffer_if *msg0, | |
1136 | const struct comm_addr *src) | |
1137 | { | |
1138 | uint32_t type; | |
1139 | ||
48b97423 | 1140 | if (!decrypt_msg0(st,msg0,src)) |
065e1922 IJ |
1141 | return False; |
1142 | ||
2fe58dfd | 1143 | CHECK_AVAIL(msg0,4); |
59635212 | 1144 | type=buf_unprepend_uint32(msg0); |
2fe58dfd | 1145 | switch(type) { |
794f2398 SE |
1146 | case LABEL_MSG7: |
1147 | /* We must forget about the current session. */ | |
1d388569 | 1148 | delete_keys(st,"request from peer",LOG_SEC); |
794f2398 | 1149 | return True; |
2fe58dfd SE |
1150 | case LABEL_MSG9: |
1151 | /* Deliver to netlink layer */ | |
469fd1d9 | 1152 | st->netlink->deliver(st->netlink->st,msg0); |
446353cd | 1153 | transport_data_msgok(st,src); |
837cf01e IJ |
1154 | /* See whether we should start negotiating a new key */ |
1155 | if (st->now > st->renegotiate_key_time) | |
dd9209d1 | 1156 | initiate_key_setup(st,"incoming packet in renegotiation window",0); |
2fe58dfd | 1157 | return True; |
2fe58dfd | 1158 | default: |
ff05a229 SE |
1159 | slog(st,LOG_SEC,"incoming encrypted message of type %08x " |
1160 | "(unknown)",type); | |
2fe58dfd SE |
1161 | break; |
1162 | } | |
1163 | return False; | |
1164 | } | |
1165 | ||
1166 | static void dump_packet(struct site *st, struct buffer_if *buf, | |
a15faeb2 | 1167 | const struct comm_addr *addr, bool_t incoming) |
2fe58dfd | 1168 | { |
0a6cbade IJ |
1169 | uint32_t dest=get_uint32(buf->start); |
1170 | uint32_t source=get_uint32(buf->start+4); | |
1171 | uint32_t msgtype=get_uint32(buf->start+8); | |
2fe58dfd SE |
1172 | |
1173 | if (st->log_events & LOG_DUMP) | |
040ee979 SE |
1174 | slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:", |
1175 | st->tunname,incoming?"incoming":"outgoing", | |
1176 | dest,source,msgtype); | |
2fe58dfd SE |
1177 | } |
1178 | ||
1179 | static uint32_t site_status(void *st) | |
1180 | { | |
1181 | return 0; | |
1182 | } | |
1183 | ||
1184 | static bool_t send_msg(struct site *st) | |
1185 | { | |
1186 | if (st->retries>0) { | |
446353cd | 1187 | transport_xmit(st, &st->setup_peers, &st->buffer, True); |
e7f8ec2a | 1188 | st->timeout=st->now+st->setup_retry_interval; |
2fe58dfd SE |
1189 | st->retries--; |
1190 | return True; | |
bd98cd6b | 1191 | } else if (st->state==SITE_SENTMSG5) { |
4f3c75ac | 1192 | logtimeout(st,"timed out sending MSG5, stashing new key"); |
bd98cd6b IJ |
1193 | /* We stash the key we have produced, in case it turns out that |
1194 | * our peer did see our MSG5 after all and starts using it. */ | |
1195 | /* This is a bit like some of activate_new_key */ | |
1196 | struct transform_inst_if *t; | |
1197 | t=st->auxiliary_key.transform; | |
1198 | st->auxiliary_key.transform=st->new_transform; | |
1199 | st->new_transform=t; | |
0afd257e | 1200 | dispose_transform(&st->new_transform); |
bd98cd6b | 1201 | |
bd98cd6b IJ |
1202 | st->auxiliary_is_new=1; |
1203 | st->auxiliary_key.key_timeout=st->now+st->key_lifetime; | |
1204 | st->auxiliary_renegotiate_key_time=st->now+st->key_renegotiate_time; | |
1205 | st->auxiliary_key.remote_session_id=st->setup_session_id; | |
1206 | ||
1207 | enter_state_wait(st); | |
1208 | return False; | |
2fe58dfd | 1209 | } else { |
4f3c75ac | 1210 | logtimeout(st,"timed out sending key setup packet " |
3454dce4 | 1211 | "(in state %s)",state_name(st->state)); |
2fe58dfd SE |
1212 | enter_state_wait(st); |
1213 | return False; | |
1214 | } | |
1215 | } | |
1216 | ||
cc420616 | 1217 | static void site_resolve_callback(void *sst, const struct comm_addr *addrs, |
83dbdd3f | 1218 | int stored_naddrs, int all_naddrs, |
bc07424d | 1219 | const char *address, const char *failwhy) |
2fe58dfd SE |
1220 | { |
1221 | struct site *st=sst; | |
1222 | ||
83dbdd3f IJ |
1223 | if (!stored_naddrs) { |
1224 | slog(st,LOG_ERROR,"resolution of %s failed: %s",address,failwhy); | |
1225 | } else { | |
1226 | slog(st,LOG_PEER_ADDRS,"resolution of %s completed, %d addrs, eg: %s", | |
1227 | address, all_naddrs, comm_addr_to_string(&addrs[0]));; | |
1228 | ||
1229 | int space=st->transport_peers_max-st->resolving_n_results_stored; | |
1230 | int n_tocopy=MIN(stored_naddrs,space); | |
1231 | COPY_ARRAY(st->resolving_results + st->resolving_n_results_stored, | |
1232 | addrs, | |
1233 | n_tocopy); | |
1234 | st->resolving_n_results_stored += n_tocopy; | |
1235 | st->resolving_n_results_all += all_naddrs; | |
1236 | } | |
1237 | ||
1238 | decrement_resolving_count(st,1); | |
1239 | } | |
1240 | ||
1241 | static void decrement_resolving_count(struct site *st, int by) | |
1242 | { | |
1243 | assert(st->resolving_count>0); | |
1244 | st->resolving_count-=by; | |
1245 | ||
1246 | if (st->resolving_count) | |
1247 | return; | |
1248 | ||
1249 | /* OK, we are done with them all. Handle combined results. */ | |
1250 | ||
1251 | const struct comm_addr *addrs=st->resolving_results; | |
1252 | int naddrs=st->resolving_n_results_stored; | |
1253 | assert(naddrs<=st->transport_peers_max); | |
5c19b79c | 1254 | |
cc420616 | 1255 | if (naddrs) { |
83dbdd3f | 1256 | if (naddrs != st->resolving_n_results_all) { |
cc420616 IJ |
1257 | slog(st,LOG_SETUP_INIT,"resolution of supplied addresses/names" |
1258 | " yielded too many results (%d > %d), some ignored", | |
83dbdd3f | 1259 | st->resolving_n_results_all, naddrs); |
cc420616 | 1260 | } |
83dbdd3f | 1261 | slog(st,LOG_STATE,"resolution completed, %d addrs, eg: %s", |
d9d101ea | 1262 | naddrs, iaddr_to_string(&addrs[0].ia));; |
446353cd | 1263 | } |
c22c3541 IJ |
1264 | |
1265 | switch (st->state) { | |
1266 | case SITE_RESOLVE: | |
45a14422 | 1267 | if (transport_compute_setupinit_peers(st,addrs,naddrs,0)) { |
c22c3541 IJ |
1268 | enter_new_state(st,SITE_SENTMSG1); |
1269 | } else { | |
1270 | /* Can't figure out who to try to to talk to */ | |
1271 | slog(st,LOG_SETUP_INIT, | |
1272 | "key exchange failed: cannot find peer address"); | |
1273 | enter_state_run(st); | |
1274 | } | |
1275 | break; | |
1276 | case SITE_SENTMSG1: case SITE_SENTMSG2: | |
1277 | case SITE_SENTMSG3: case SITE_SENTMSG4: | |
1278 | case SITE_SENTMSG5: | |
45a14422 | 1279 | if (naddrs) { |
c22c3541 IJ |
1280 | /* We start using the address immediately for data too. |
1281 | * It's best to store it in st->peers now because we might | |
1282 | * go via SENTMSG5, WAIT, and a MSG0, straight into using | |
1283 | * the new key (without updating the data peer addrs). */ | |
45a14422 | 1284 | transport_resolve_complete(st,addrs,naddrs); |
c22c3541 IJ |
1285 | } else if (st->local_mobile) { |
1286 | /* We can't let this rest because we may have a peer | |
1287 | * address which will break in the future. */ | |
83dbdd3f IJ |
1288 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
1289 | "abandoning key exchange"); | |
c22c3541 IJ |
1290 | enter_state_wait(st); |
1291 | } else { | |
83dbdd3f | 1292 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
c22c3541 | 1293 | " continuing to use source address of peer's packets" |
83dbdd3f | 1294 | " for key exchange and ultimately data"); |
c22c3541 IJ |
1295 | } |
1296 | break; | |
1297 | case SITE_RUN: | |
45a14422 | 1298 | if (naddrs) { |
83dbdd3f IJ |
1299 | slog(st,LOG_SETUP_INIT,"resolution completed tardily," |
1300 | " updating peer address(es)"); | |
45a14422 | 1301 | transport_resolve_complete_tardy(st,addrs,naddrs); |
c22c3541 IJ |
1302 | } else if (st->local_mobile) { |
1303 | /* Not very good. We should queue (another) renegotiation | |
1304 | * so that we can update the peer address. */ | |
1305 | st->key_renegotiate_time=st->now+st->wait_timeout; | |
1306 | } else { | |
83dbdd3f IJ |
1307 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
1308 | " continuing to use source address of peer's packets"); | |
c22c3541 IJ |
1309 | } |
1310 | break; | |
1311 | case SITE_WAIT: | |
1312 | case SITE_STOP: | |
1313 | /* oh well */ | |
1314 | break; | |
2fe58dfd SE |
1315 | } |
1316 | } | |
1317 | ||
dd9209d1 IJ |
1318 | static bool_t initiate_key_setup(struct site *st, cstring_t reason, |
1319 | const struct comm_addr *prod_hint) | |
9d3a4132 | 1320 | { |
77effe1d | 1321 | /* Reentrancy hazard: can call enter_new_state/enter_state_* */ |
9d3a4132 | 1322 | if (st->state!=SITE_RUN) return False; |
794f2398 | 1323 | slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason); |
83dbdd3f IJ |
1324 | if (st->addresses) { |
1325 | slog(st,LOG_SETUP_INIT,"resolving peer address(es)"); | |
9d3a4132 | 1326 | return enter_state_resolve(st); |
45a14422 | 1327 | } else if (transport_compute_setupinit_peers(st,0,0,prod_hint)) { |
ff05a229 | 1328 | return enter_new_state(st,SITE_SENTMSG1); |
9d3a4132 | 1329 | } |
ff05a229 | 1330 | slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer"); |
9d3a4132 SE |
1331 | return False; |
1332 | } | |
1333 | ||
2fe58dfd SE |
1334 | static void activate_new_key(struct site *st) |
1335 | { | |
1336 | struct transform_inst_if *t; | |
1337 | ||
02b0959b IJ |
1338 | /* We have three transform instances, which we swap between old, |
1339 | active and setup */ | |
1340 | t=st->auxiliary_key.transform; | |
1341 | st->auxiliary_key.transform=st->current.transform; | |
19e9a588 | 1342 | st->current.transform=st->new_transform; |
2fe58dfd | 1343 | st->new_transform=t; |
0afd257e | 1344 | dispose_transform(&st->new_transform); |
2fe58dfd | 1345 | |
2fe58dfd | 1346 | st->timeout=0; |
bd98cd6b | 1347 | st->auxiliary_is_new=0; |
02b0959b | 1348 | st->auxiliary_key.key_timeout=st->current.key_timeout; |
19e9a588 | 1349 | st->current.key_timeout=st->now+st->key_lifetime; |
ff05a229 | 1350 | st->renegotiate_key_time=st->now+st->key_renegotiate_time; |
446353cd | 1351 | transport_peers_copy(st,&st->peers,&st->setup_peers); |
19e9a588 | 1352 | st->current.remote_session_id=st->setup_session_id; |
2fe58dfd | 1353 | |
3ed1846a IJ |
1354 | /* Compute the inter-site MTU. This is min( our_mtu, their_mtu ). |
1355 | * But their mtu be unspecified, in which case we just use ours. */ | |
1356 | uint32_t intersite_mtu= | |
1357 | MIN(st->mtu_target, st->remote_adv_mtu ?: ~(uint32_t)0); | |
1358 | st->netlink->set_mtu(st->netlink->st,intersite_mtu); | |
1359 | ||
1360 | slog(st,LOG_ACTIVATE_KEY,"new key activated" | |
1361 | " (mtu ours=%"PRId32" theirs=%"PRId32" intersite=%"PRId32")", | |
1362 | st->mtu_target, st->remote_adv_mtu, intersite_mtu); | |
9d3a4132 | 1363 | enter_state_run(st); |
2fe58dfd SE |
1364 | } |
1365 | ||
1d388569 IJ |
1366 | static void delete_one_key(struct site *st, struct data_key *key, |
1367 | cstring_t reason, cstring_t which, uint32_t loglevel) | |
1368 | { | |
0afd257e | 1369 | if (!is_transform_valid(key->transform)) return; |
1d388569 | 1370 | if (reason) slog(st,loglevel,"%s deleted (%s)",which,reason); |
0afd257e | 1371 | dispose_transform(&key->transform); |
1d388569 IJ |
1372 | key->key_timeout=0; |
1373 | } | |
1374 | ||
1375 | static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel) | |
794f2398 | 1376 | { |
3d8d8f4e | 1377 | if (current_valid(st)) { |
794f2398 SE |
1378 | slog(st,loglevel,"session closed (%s)",reason); |
1379 | ||
1d388569 | 1380 | delete_one_key(st,&st->current,0,0,0); |
794f2398 SE |
1381 | set_link_quality(st); |
1382 | } | |
02b0959b | 1383 | delete_one_key(st,&st->auxiliary_key,0,0,0); |
794f2398 SE |
1384 | } |
1385 | ||
2fe58dfd SE |
1386 | static void state_assert(struct site *st, bool_t ok) |
1387 | { | |
4f5e39ec | 1388 | if (!ok) fatal("site:state_assert"); |
2fe58dfd SE |
1389 | } |
1390 | ||
1391 | static void enter_state_stop(struct site *st) | |
1392 | { | |
1393 | st->state=SITE_STOP; | |
1394 | st->timeout=0; | |
1d388569 | 1395 | delete_keys(st,"entering state STOP",LOG_TIMEOUT_KEY); |
0afd257e | 1396 | dispose_transform(&st->new_transform); |
2fe58dfd SE |
1397 | } |
1398 | ||
9d3a4132 SE |
1399 | static void set_link_quality(struct site *st) |
1400 | { | |
1401 | uint32_t quality; | |
3d8d8f4e | 1402 | if (current_valid(st)) |
9d3a4132 SE |
1403 | quality=LINK_QUALITY_UP; |
1404 | else if (st->state==SITE_WAIT || st->state==SITE_STOP) | |
1405 | quality=LINK_QUALITY_DOWN; | |
83dbdd3f | 1406 | else if (st->addresses) |
9d3a4132 | 1407 | quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS; |
446353cd | 1408 | else if (transport_peers_valid(&st->peers)) |
9d3a4132 SE |
1409 | quality=LINK_QUALITY_DOWN_STALE_ADDRESS; |
1410 | else | |
1411 | quality=LINK_QUALITY_DOWN; | |
1412 | ||
469fd1d9 | 1413 | st->netlink->set_quality(st->netlink->st,quality); |
9d3a4132 SE |
1414 | } |
1415 | ||
2fe58dfd SE |
1416 | static void enter_state_run(struct site *st) |
1417 | { | |
1418 | slog(st,LOG_STATE,"entering state RUN"); | |
1419 | st->state=SITE_RUN; | |
1420 | st->timeout=0; | |
9d3a4132 | 1421 | |
ff05a229 | 1422 | st->setup_session_id=0; |
446353cd | 1423 | transport_peers_clear(st,&st->setup_peers); |
4f28e77e IJ |
1424 | FILLZERO(st->localN); |
1425 | FILLZERO(st->remoteN); | |
0afd257e | 1426 | dispose_transform(&st->new_transform); |
ff05a229 | 1427 | memset(st->dhsecret,0,st->dh->len); |
7c9ca4bd | 1428 | memset(st->sharedsecret,0,st->sharedsecretlen); |
9d3a4132 | 1429 | set_link_quality(st); |
2fe58dfd SE |
1430 | } |
1431 | ||
5c19b79c IJ |
1432 | static bool_t ensure_resolving(struct site *st) |
1433 | { | |
1434 | /* Reentrancy hazard: may call site_resolve_callback and hence | |
1435 | * enter_new_state, enter_state_* and generate_msg*. */ | |
83dbdd3f | 1436 | if (st->resolving_count) |
5c19b79c IJ |
1437 | return True; |
1438 | ||
83dbdd3f | 1439 | assert(st->addresses); |
4ac8a7d2 | 1440 | |
5c19b79c | 1441 | /* resolver->request might reentrantly call site_resolve_callback |
83dbdd3f IJ |
1442 | * which will decrement st->resolving, so we need to increment it |
1443 | * twice beforehand to prevent decrement from thinking we're | |
1444 | * finished, and decrement it ourselves. Alternatively if | |
1445 | * everything fails then there are no callbacks due and we simply | |
1446 | * set it to 0 and return false.. */ | |
1447 | st->resolving_n_results_stored=0; | |
1448 | st->resolving_n_results_all=0; | |
1449 | st->resolving_count+=2; | |
1450 | const char **addrp=st->addresses; | |
1451 | const char *address; | |
1452 | bool_t anyok=False; | |
1453 | for (; (address=*addrp++); ) { | |
1454 | bool_t ok = st->resolver->request(st->resolver->st,address, | |
1455 | st->remoteport,st->comms[0], | |
1456 | site_resolve_callback,st); | |
1457 | if (ok) | |
1458 | st->resolving_count++; | |
1459 | anyok|=ok; | |
1460 | } | |
1461 | if (!anyok) { | |
1462 | st->resolving_count=0; | |
1463 | return False; | |
1464 | } | |
1465 | decrement_resolving_count(st,2); | |
1466 | return True; | |
5c19b79c IJ |
1467 | } |
1468 | ||
2fe58dfd SE |
1469 | static bool_t enter_state_resolve(struct site *st) |
1470 | { | |
77effe1d | 1471 | /* Reentrancy hazard! See ensure_resolving. */ |
2fe58dfd SE |
1472 | state_assert(st,st->state==SITE_RUN); |
1473 | slog(st,LOG_STATE,"entering state RESOLVE"); | |
1474 | st->state=SITE_RESOLVE; | |
5c19b79c | 1475 | return ensure_resolving(st); |
2fe58dfd SE |
1476 | } |
1477 | ||
ff05a229 | 1478 | static bool_t enter_new_state(struct site *st, uint32_t next) |
2fe58dfd | 1479 | { |
ff05a229 | 1480 | bool_t (*gen)(struct site *st); |
3b83c932 SE |
1481 | int r; |
1482 | ||
ff05a229 SE |
1483 | slog(st,LOG_STATE,"entering state %s",state_name(next)); |
1484 | switch(next) { | |
1485 | case SITE_SENTMSG1: | |
1486 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE); | |
1487 | gen=generate_msg1; | |
1488 | break; | |
1489 | case SITE_SENTMSG2: | |
1490 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1491 | st->state==SITE_SENTMSG1 || st->state==SITE_WAIT); | |
1492 | gen=generate_msg2; | |
1493 | break; | |
1494 | case SITE_SENTMSG3: | |
1495 | state_assert(st,st->state==SITE_SENTMSG1); | |
1496 | BUF_FREE(&st->buffer); | |
1497 | gen=generate_msg3; | |
1498 | break; | |
1499 | case SITE_SENTMSG4: | |
1500 | state_assert(st,st->state==SITE_SENTMSG2); | |
1501 | BUF_FREE(&st->buffer); | |
1502 | gen=generate_msg4; | |
1503 | break; | |
1504 | case SITE_SENTMSG5: | |
1505 | state_assert(st,st->state==SITE_SENTMSG3); | |
1506 | BUF_FREE(&st->buffer); | |
1507 | gen=generate_msg5; | |
1508 | break; | |
1509 | case SITE_RUN: | |
1510 | state_assert(st,st->state==SITE_SENTMSG4); | |
1511 | BUF_FREE(&st->buffer); | |
1512 | gen=generate_msg6; | |
1513 | break; | |
1514 | default: | |
1515 | gen=NULL; | |
4f5e39ec | 1516 | fatal("enter_new_state(%s): invalid new state",state_name(next)); |
ff05a229 | 1517 | break; |
2fe58dfd | 1518 | } |
2fe58dfd | 1519 | |
3b83c932 SE |
1520 | if (hacky_par_start_failnow()) return False; |
1521 | ||
1522 | r= gen(st) && send_msg(st); | |
1523 | ||
1524 | hacky_par_end(&r, | |
e7f8ec2a | 1525 | st->setup_retries, st->setup_retry_interval, |
3b83c932 SE |
1526 | send_msg, st); |
1527 | ||
1528 | if (r) { | |
ff05a229 SE |
1529 | st->state=next; |
1530 | if (next==SITE_RUN) { | |
1531 | BUF_FREE(&st->buffer); /* Never reused */ | |
1532 | st->timeout=0; /* Never retransmit */ | |
1533 | activate_new_key(st); | |
1534 | } | |
2fe58dfd SE |
1535 | return True; |
1536 | } | |
ff05a229 SE |
1537 | slog(st,LOG_ERROR,"error entering state %s",state_name(next)); |
1538 | st->buffer.free=False; /* Unconditionally use the buffer; it may be | |
1539 | in either state, and enter_state_wait() will | |
1540 | do a BUF_FREE() */ | |
2fe58dfd SE |
1541 | enter_state_wait(st); |
1542 | return False; | |
1543 | } | |
1544 | ||
ff05a229 | 1545 | /* msg7 tells our peer that we're about to forget our key */ |
fe5e9cc4 | 1546 | static bool_t send_msg7(struct site *st, cstring_t reason) |
794f2398 | 1547 | { |
fe5e9cc4 | 1548 | cstring_t transform_err; |
794f2398 | 1549 | |
3d8d8f4e | 1550 | if (current_valid(st) && st->buffer.free |
446353cd | 1551 | && transport_peers_valid(&st->peers)) { |
794f2398 | 1552 | BUF_ALLOC(&st->buffer,"site:MSG7"); |
3abd18e8 | 1553 | buffer_init(&st->buffer,calculate_max_start_pad()); |
794f2398 SE |
1554 | buf_append_uint32(&st->buffer,LABEL_MSG7); |
1555 | buf_append_string(&st->buffer,reason); | |
0afd257e IJ |
1556 | if (call_transform_forwards(st, st->current.transform, |
1557 | &st->buffer, &transform_err)) | |
1558 | goto free_out; | |
794f2398 | 1559 | buf_prepend_uint32(&st->buffer,LABEL_MSG0); |
58650a70 | 1560 | buf_prepend_uint32(&st->buffer,st->index); |
19e9a588 | 1561 | buf_prepend_uint32(&st->buffer,st->current.remote_session_id); |
446353cd | 1562 | transport_xmit(st,&st->peers,&st->buffer,True); |
794f2398 | 1563 | BUF_FREE(&st->buffer); |
0afd257e | 1564 | free_out: |
794f2398 SE |
1565 | return True; |
1566 | } | |
1567 | return False; | |
1568 | } | |
1569 | ||
2fe58dfd SE |
1570 | /* We go into this state if our peer becomes uncommunicative. Similar to |
1571 | the "stop" state, we forget all session keys for a while, before | |
1572 | re-entering the "run" state. */ | |
1573 | static void enter_state_wait(struct site *st) | |
1574 | { | |
1575 | slog(st,LOG_STATE,"entering state WAIT"); | |
1576 | st->timeout=st->now+st->wait_timeout; | |
1577 | st->state=SITE_WAIT; | |
9d3a4132 | 1578 | set_link_quality(st); |
2fe58dfd SE |
1579 | BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */ |
1580 | /* XXX Erase keys etc. */ | |
1581 | } | |
1582 | ||
dd9209d1 IJ |
1583 | static void generate_prod(struct site *st, struct buffer_if *buf) |
1584 | { | |
1585 | buffer_init(buf,0); | |
1586 | buf_append_uint32(buf,0); | |
1587 | buf_append_uint32(buf,0); | |
1588 | buf_append_uint32(buf,LABEL_PROD); | |
1589 | buf_append_string(buf,st->localname); | |
1590 | buf_append_string(buf,st->remotename); | |
1591 | } | |
1592 | ||
1593 | static void generate_send_prod(struct site *st, | |
1594 | const struct comm_addr *source) | |
1595 | { | |
1596 | if (!st->allow_send_prod) return; /* too soon */ | |
1597 | if (!(st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1598 | st->state==SITE_WAIT)) return; /* we'd ignore peer's MSG1 */ | |
1599 | ||
1600 | slog(st,LOG_SETUP_INIT,"prodding peer for key exchange"); | |
1601 | st->allow_send_prod=0; | |
1602 | generate_prod(st,&st->scratch); | |
1603 | dump_packet(st,&st->scratch,source,False); | |
1604 | source->comm->sendmsg(source->comm->st, &st->scratch, source); | |
1605 | } | |
1606 | ||
16f73fa6 | 1607 | static inline void site_settimeout(uint64_t timeout, int *timeout_io) |
fe5e9cc4 SE |
1608 | { |
1609 | if (timeout) { | |
0009e60a IJ |
1610 | int64_t offset=timeout-*now; |
1611 | if (offset<0) offset=0; | |
fe5e9cc4 SE |
1612 | if (offset>INT_MAX) offset=INT_MAX; |
1613 | if (*timeout_io<0 || offset<*timeout_io) | |
1614 | *timeout_io=offset; | |
1615 | } | |
1616 | } | |
1617 | ||
2fe58dfd | 1618 | static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, |
90a39563 | 1619 | int *timeout_io) |
2fe58dfd SE |
1620 | { |
1621 | struct site *st=sst; | |
1622 | ||
ee697dd9 | 1623 | BEFOREPOLL_WANT_FDS(0); /* We don't use any file descriptors */ |
2fe58dfd SE |
1624 | st->now=*now; |
1625 | ||
1626 | /* Work out when our next timeout is. The earlier of 'timeout' or | |
19e9a588 | 1627 | 'current.key_timeout'. A stored value of '0' indicates no timeout |
2fe58dfd | 1628 | active. */ |
16f73fa6 | 1629 | site_settimeout(st->timeout, timeout_io); |
19e9a588 | 1630 | site_settimeout(st->current.key_timeout, timeout_io); |
02b0959b | 1631 | site_settimeout(st->auxiliary_key.key_timeout, timeout_io); |
2fe58dfd SE |
1632 | |
1633 | return 0; /* success */ | |
1634 | } | |
1635 | ||
1d388569 IJ |
1636 | static void check_expiry(struct site *st, struct data_key *key, |
1637 | const char *which) | |
1638 | { | |
1639 | if (key->key_timeout && *now>key->key_timeout) { | |
1640 | delete_one_key(st,key,"maximum life exceeded",which,LOG_TIMEOUT_KEY); | |
1641 | } | |
1642 | } | |
1643 | ||
2fe58dfd | 1644 | /* NB site_afterpoll will be called before site_beforepoll is ever called */ |
90a39563 | 1645 | static void site_afterpoll(void *sst, struct pollfd *fds, int nfds) |
2fe58dfd SE |
1646 | { |
1647 | struct site *st=sst; | |
1648 | ||
1649 | st->now=*now; | |
1650 | if (st->timeout && *now>st->timeout) { | |
2fe58dfd | 1651 | st->timeout=0; |
3b83c932 SE |
1652 | if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) { |
1653 | if (!hacky_par_start_failnow()) | |
1654 | send_msg(st); | |
1655 | } else if (st->state==SITE_WAIT) { | |
2fe58dfd SE |
1656 | enter_state_run(st); |
1657 | } else { | |
1658 | slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d", | |
1659 | st->state); | |
1660 | } | |
1661 | } | |
1d388569 | 1662 | check_expiry(st,&st->current,"current key"); |
02b0959b | 1663 | check_expiry(st,&st->auxiliary_key,"auxiliary key"); |
2fe58dfd SE |
1664 | } |
1665 | ||
1666 | /* This function is called by the netlink device to deliver packets | |
1667 | intended for the remote network. The packet is in "raw" wire | |
1668 | format, but is guaranteed to be word-aligned. */ | |
469fd1d9 | 1669 | static void site_outgoing(void *sst, struct buffer_if *buf) |
2fe58dfd SE |
1670 | { |
1671 | struct site *st=sst; | |
fe5e9cc4 | 1672 | cstring_t transform_err; |
2fe58dfd SE |
1673 | |
1674 | if (st->state==SITE_STOP) { | |
1675 | BUF_FREE(buf); | |
1676 | return; | |
1677 | } | |
1678 | ||
dd9209d1 IJ |
1679 | st->allow_send_prod=1; |
1680 | ||
2fe58dfd SE |
1681 | /* In all other states we consider delivering the packet if we have |
1682 | a valid key and a valid address to send it to. */ | |
3d8d8f4e | 1683 | if (current_valid(st) && transport_peers_valid(&st->peers)) { |
2fe58dfd | 1684 | /* Transform it and send it */ |
70dc107b SE |
1685 | if (buf->size>0) { |
1686 | buf_prepend_uint32(buf,LABEL_MSG9); | |
0afd257e IJ |
1687 | if (call_transform_forwards(st, st->current.transform, |
1688 | buf, &transform_err)) | |
1689 | goto free_out; | |
70dc107b | 1690 | buf_prepend_uint32(buf,LABEL_MSG0); |
58650a70 | 1691 | buf_prepend_uint32(buf,st->index); |
19e9a588 | 1692 | buf_prepend_uint32(buf,st->current.remote_session_id); |
446353cd | 1693 | transport_xmit(st,&st->peers,buf,False); |
70dc107b | 1694 | } |
0afd257e | 1695 | free_out: |
2fe58dfd SE |
1696 | BUF_FREE(buf); |
1697 | return; | |
1698 | } | |
1699 | ||
70dc107b | 1700 | slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size); |
2fe58dfd | 1701 | BUF_FREE(buf); |
dd9209d1 | 1702 | initiate_key_setup(st,"outgoing packet",0); |
2fe58dfd SE |
1703 | } |
1704 | ||
7e29719e IJ |
1705 | static bool_t named_for_us(struct site *st, const struct buffer_if *buf_in, |
1706 | uint32_t type, struct msg *m) | |
1707 | /* For packets which are identified by the local and remote names. | |
1708 | * If it has our name and our peer's name in it it's for us. */ | |
1709 | { | |
1710 | struct buffer_if buf[1]; | |
1711 | buffer_readonly_clone(buf,buf_in); | |
1712 | return unpick_msg(st,type,buf,m) | |
1713 | && name_matches(&m->remote,st->remotename) | |
1714 | && name_matches(&m->local,st->localname); | |
1715 | } | |
1716 | ||
2fe58dfd | 1717 | /* This function is called by the communication device to deliver |
dd9209d1 IJ |
1718 | packets from our peers. |
1719 | It should return True if the packet is recognised as being for | |
1720 | this current site instance (and should therefore not be processed | |
1721 | by other sites), even if the packet was otherwise ignored. */ | |
2fe58dfd | 1722 | static bool_t site_incoming(void *sst, struct buffer_if *buf, |
a15faeb2 | 1723 | const struct comm_addr *source) |
2fe58dfd SE |
1724 | { |
1725 | struct site *st=sst; | |
20138876 IJ |
1726 | |
1727 | if (buf->size < 12) return False; | |
1728 | ||
0a6cbade IJ |
1729 | uint32_t dest=get_uint32(buf->start); |
1730 | uint32_t msgtype=get_uint32(buf->start+8); | |
7e29719e IJ |
1731 | struct msg named_msg; |
1732 | ||
1733 | if (msgtype==LABEL_MSG1) { | |
1734 | if (!named_for_us(st,buf,msgtype,&named_msg)) | |
1735 | return False; | |
1736 | /* It's a MSG1 addressed to us. Decide what to do about it. */ | |
1737 | dump_packet(st,buf,source,True); | |
1738 | if (st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1739 | st->state==SITE_WAIT) { | |
1740 | /* We should definitely process it */ | |
45a14422 | 1741 | transport_compute_setupinit_peers(st,0,0,source); |
7e29719e IJ |
1742 | if (process_msg1(st,buf,source,&named_msg)) { |
1743 | slog(st,LOG_SETUP_INIT,"key setup initiated by peer"); | |
c22c3541 | 1744 | bool_t entered=enter_new_state(st,SITE_SENTMSG2); |
83dbdd3f | 1745 | if (entered && st->addresses && st->local_mobile) |
c22c3541 IJ |
1746 | /* We must do this as the very last thing, because |
1747 | the resolver callback might reenter us. */ | |
1748 | ensure_resolving(st); | |
7e29719e IJ |
1749 | } else { |
1750 | slog(st,LOG_ERROR,"failed to process incoming msg1"); | |
1751 | } | |
1752 | BUF_FREE(buf); | |
1753 | return True; | |
1754 | } else if (st->state==SITE_SENTMSG1) { | |
1755 | /* We've just sent a message 1! They may have crossed on | |
1756 | the wire. If we have priority then we ignore the | |
1757 | incoming one, otherwise we process it as usual. */ | |
1758 | if (st->setup_priority) { | |
1759 | BUF_FREE(buf); | |
1760 | slog(st,LOG_DUMP,"crossed msg1s; we are higher " | |
1761 | "priority => ignore incoming msg1"); | |
1762 | return True; | |
1763 | } else { | |
1764 | slog(st,LOG_DUMP,"crossed msg1s; we are lower " | |
1765 | "priority => use incoming msg1"); | |
1766 | if (process_msg1(st,buf,source,&named_msg)) { | |
1767 | BUF_FREE(&st->buffer); /* Free our old message 1 */ | |
c22c3541 | 1768 | transport_setup_msgok(st,source); |
ff05a229 | 1769 | enter_new_state(st,SITE_SENTMSG2); |
2fe58dfd | 1770 | } else { |
7e29719e IJ |
1771 | slog(st,LOG_ERROR,"failed to process an incoming " |
1772 | "crossed msg1 (we have low priority)"); | |
2fe58dfd SE |
1773 | } |
1774 | BUF_FREE(buf); | |
1775 | return True; | |
2fe58dfd | 1776 | } |
2fe58dfd | 1777 | } |
7e29719e IJ |
1778 | /* The message 1 was received at an unexpected stage of the |
1779 | key setup. XXX POLICY - what do we do? */ | |
1780 | slog(st,LOG_UNEXPECTED,"unexpected incoming message 1"); | |
1781 | BUF_FREE(buf); | |
1782 | return True; | |
2fe58dfd | 1783 | } |
dd9209d1 IJ |
1784 | if (msgtype==LABEL_PROD) { |
1785 | if (!named_for_us(st,buf,msgtype,&named_msg)) | |
1786 | return False; | |
1787 | dump_packet(st,buf,source,True); | |
1788 | if (st->state!=SITE_RUN) { | |
1789 | slog(st,LOG_DROP,"ignoring PROD when not in state RUN"); | |
1790 | } else if (current_valid(st)) { | |
1791 | slog(st,LOG_DROP,"ignoring PROD when we think we have a key"); | |
1792 | } else { | |
1793 | initiate_key_setup(st,"peer sent PROD packet",source); | |
1794 | } | |
1795 | BUF_FREE(buf); | |
1796 | return True; | |
1797 | } | |
58650a70 | 1798 | if (dest==st->index) { |
2fe58dfd SE |
1799 | /* Explicitly addressed to us */ |
1800 | if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True); | |
1801 | switch (msgtype) { | |
136740e6 | 1802 | case LABEL_NAK: |
794f2398 SE |
1803 | /* If the source is our current peer then initiate a key setup, |
1804 | because our peer's forgotten the key */ | |
19e9a588 | 1805 | if (get_uint32(buf->start+4)==st->current.remote_session_id) { |
dd9209d1 | 1806 | bool_t initiated; |
e5e67212 | 1807 | initiated = initiate_key_setup(st,"received a NAK",source); |
dd9209d1 | 1808 | if (!initiated) generate_send_prod(st,source); |
794f2398 SE |
1809 | } else { |
1810 | slog(st,LOG_SEC,"bad incoming NAK"); | |
1811 | } | |
1812 | break; | |
2fe58dfd SE |
1813 | case LABEL_MSG0: |
1814 | process_msg0(st,buf,source); | |
1815 | break; | |
1816 | case LABEL_MSG1: | |
1817 | /* Setup packet: should not have been explicitly addressed | |
1818 | to us */ | |
59635212 | 1819 | slog(st,LOG_SEC,"incoming explicitly addressed msg1"); |
2fe58dfd SE |
1820 | break; |
1821 | case LABEL_MSG2: | |
1822 | /* Setup packet: expected only in state SENTMSG1 */ | |
1823 | if (st->state!=SITE_SENTMSG1) { | |
1824 | slog(st,LOG_UNEXPECTED,"unexpected MSG2"); | |
446353cd IJ |
1825 | } else if (process_msg2(st,buf,source)) { |
1826 | transport_setup_msgok(st,source); | |
ff05a229 | 1827 | enter_new_state(st,SITE_SENTMSG3); |
446353cd | 1828 | } else { |
59635212 | 1829 | slog(st,LOG_SEC,"invalid MSG2"); |
2fe58dfd SE |
1830 | } |
1831 | break; | |
1832 | case LABEL_MSG3: | |
5b5f297f | 1833 | case LABEL_MSG3BIS: |
2fe58dfd SE |
1834 | /* Setup packet: expected only in state SENTMSG2 */ |
1835 | if (st->state!=SITE_SENTMSG2) { | |
1836 | slog(st,LOG_UNEXPECTED,"unexpected MSG3"); | |
5b5f297f | 1837 | } else if (process_msg3(st,buf,source,msgtype)) { |
446353cd | 1838 | transport_setup_msgok(st,source); |
ff05a229 | 1839 | enter_new_state(st,SITE_SENTMSG4); |
446353cd | 1840 | } else { |
59635212 | 1841 | slog(st,LOG_SEC,"invalid MSG3"); |
2fe58dfd SE |
1842 | } |
1843 | break; | |
1844 | case LABEL_MSG4: | |
1845 | /* Setup packet: expected only in state SENTMSG3 */ | |
1846 | if (st->state!=SITE_SENTMSG3) { | |
1847 | slog(st,LOG_UNEXPECTED,"unexpected MSG4"); | |
446353cd IJ |
1848 | } else if (process_msg4(st,buf,source)) { |
1849 | transport_setup_msgok(st,source); | |
ff05a229 | 1850 | enter_new_state(st,SITE_SENTMSG5); |
446353cd | 1851 | } else { |
59635212 | 1852 | slog(st,LOG_SEC,"invalid MSG4"); |
2fe58dfd SE |
1853 | } |
1854 | break; | |
1855 | case LABEL_MSG5: | |
4efd681a SE |
1856 | /* Setup packet: expected only in state SENTMSG4 */ |
1857 | /* (may turn up in state RUN if our return MSG6 was lost | |
1858 | and the new key has already been activated. In that | |
05f39b4d IJ |
1859 | case we discard it. The peer will realise that we |
1860 | are using the new key when they see our data packets. | |
1861 | Until then the peer's data packets to us get discarded. */ | |
c90cc2a7 IJ |
1862 | if (st->state==SITE_SENTMSG4) { |
1863 | if (process_msg5(st,buf,source,st->new_transform)) { | |
1864 | transport_setup_msgok(st,source); | |
1865 | enter_new_state(st,SITE_RUN); | |
1866 | } else { | |
1867 | slog(st,LOG_SEC,"invalid MSG5"); | |
1868 | } | |
1869 | } else if (st->state==SITE_RUN) { | |
19e9a588 | 1870 | if (process_msg5(st,buf,source,st->current.transform)) { |
c90cc2a7 IJ |
1871 | slog(st,LOG_DROP,"got MSG5, retransmitting MSG6"); |
1872 | transport_setup_msgok(st,source); | |
19e9a588 IJ |
1873 | create_msg6(st,st->current.transform, |
1874 | st->current.remote_session_id); | |
c90cc2a7 IJ |
1875 | transport_xmit(st,&st->peers,&st->buffer,True); |
1876 | BUF_FREE(&st->buffer); | |
1877 | } else { | |
1878 | slog(st,LOG_SEC,"invalid MSG5 (in state RUN)"); | |
1879 | } | |
2fe58dfd | 1880 | } else { |
c90cc2a7 | 1881 | slog(st,LOG_UNEXPECTED,"unexpected MSG5"); |
2fe58dfd SE |
1882 | } |
1883 | break; | |
1884 | case LABEL_MSG6: | |
1885 | /* Setup packet: expected only in state SENTMSG5 */ | |
1886 | if (st->state!=SITE_SENTMSG5) { | |
1887 | slog(st,LOG_UNEXPECTED,"unexpected MSG6"); | |
1888 | } else if (process_msg6(st,buf,source)) { | |
1889 | BUF_FREE(&st->buffer); /* Free message 5 */ | |
446353cd | 1890 | transport_setup_msgok(st,source); |
2fe58dfd SE |
1891 | activate_new_key(st); |
1892 | } else { | |
59635212 | 1893 | slog(st,LOG_SEC,"invalid MSG6"); |
2fe58dfd SE |
1894 | } |
1895 | break; | |
2fe58dfd | 1896 | default: |
59635212 | 1897 | slog(st,LOG_SEC,"received message of unknown type 0x%08x", |
2fe58dfd SE |
1898 | msgtype); |
1899 | break; | |
1900 | } | |
1901 | BUF_FREE(buf); | |
1902 | return True; | |
1903 | } | |
1904 | ||
1905 | return False; | |
1906 | } | |
1907 | ||
1908 | static void site_control(void *vst, bool_t run) | |
1909 | { | |
1910 | struct site *st=vst; | |
1911 | if (run) enter_state_run(st); | |
1912 | else enter_state_stop(st); | |
1913 | } | |
1914 | ||
794f2398 SE |
1915 | static void site_phase_hook(void *sst, uint32_t newphase) |
1916 | { | |
1917 | struct site *st=sst; | |
1918 | ||
1919 | /* The program is shutting down; tell our peer */ | |
1920 | send_msg7(st,"shutting down"); | |
1921 | } | |
1922 | ||
32654a31 IJ |
1923 | static void site_childpersist_clearkeys(void *sst, uint32_t newphase) |
1924 | { | |
1925 | struct site *st=sst; | |
1926 | dispose_transform(&st->current.transform); | |
1927 | dispose_transform(&st->auxiliary_key.transform); | |
1928 | dispose_transform(&st->new_transform); | |
1929 | /* Not much point overwiting the signing key, since we loaded it | |
1930 | from disk, and it is only valid prospectively if at all, | |
1931 | anyway. */ | |
1932 | /* XXX it would be best to overwrite the DH state, because that | |
1933 | _is_ relevant to forward secrecy. However we have no | |
1934 | convenient interface for doing that and in practice gmp has | |
1935 | probably dribbled droppings all over the malloc arena. A good | |
1936 | way to fix this would be to have a privsep child for asymmetric | |
1937 | crypto operations, but that's a task for another day. */ | |
1938 | } | |
1939 | ||
2fe58dfd SE |
1940 | static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, |
1941 | list_t *args) | |
1942 | { | |
58650a70 | 1943 | static uint32_t index_sequence; |
2fe58dfd SE |
1944 | struct site *st; |
1945 | item_t *item; | |
1946 | dict_t *dict; | |
59533c16 | 1947 | int i; |
2fe58dfd | 1948 | |
b7886fd4 | 1949 | NEW(st); |
2fe58dfd SE |
1950 | |
1951 | st->cl.description="site"; | |
1952 | st->cl.type=CL_SITE; | |
1953 | st->cl.apply=NULL; | |
1954 | st->cl.interface=&st->ops; | |
1955 | st->ops.st=st; | |
1956 | st->ops.control=site_control; | |
1957 | st->ops.status=site_status; | |
1958 | ||
1959 | /* First parameter must be a dict */ | |
1960 | item=list_elem(args,0); | |
1961 | if (!item || item->type!=t_dict) | |
1962 | cfgfatal(loc,"site","parameter must be a dictionary\n"); | |
1963 | ||
1964 | dict=item->data.dict; | |
558fa3fb SE |
1965 | st->localname=dict_read_string(dict, "local-name", True, "site", loc); |
1966 | st->remotename=dict_read_string(dict, "name", True, "site", loc); | |
dba19f84 IJ |
1967 | |
1968 | st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False); | |
0391d9ee | 1969 | st->local_mobile= |
dba19f84 IJ |
1970 | dict_read_bool(dict,"local-mobile",False,"site",loc,False); |
1971 | ||
558fa3fb SE |
1972 | /* Sanity check (which also allows the 'sites' file to include |
1973 | site() closures for all sites including our own): refuse to | |
1974 | talk to ourselves */ | |
1975 | if (strcmp(st->localname,st->remotename)==0) { | |
b2a56f7c | 1976 | Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n", |
baa06aeb | 1977 | st->localname); |
0391d9ee | 1978 | if (st->peer_mobile != st->local_mobile) |
dba19f84 IJ |
1979 | cfgfatal(loc,"site","site %s's peer-mobile=%d" |
1980 | " but our local-mobile=%d\n", | |
0391d9ee | 1981 | st->localname, st->peer_mobile, st->local_mobile); |
dba19f84 IJ |
1982 | free(st); |
1983 | return NULL; | |
1984 | } | |
0391d9ee | 1985 | if (st->peer_mobile && st->local_mobile) { |
dba19f84 IJ |
1986 | Message(M_WARNING,"site %s: site is mobile but so are we" |
1987 | " -> ignoring this site\n", st->remotename); | |
558fa3fb SE |
1988 | free(st); |
1989 | return NULL; | |
1990 | } | |
dba19f84 | 1991 | |
58650a70 RK |
1992 | assert(index_sequence < 0xffffffffUL); |
1993 | st->index = ++index_sequence; | |
09a385fb | 1994 | st->local_capabilities = 0; |
469fd1d9 | 1995 | st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc); |
59533c16 | 1996 | |
5b5f297f IJ |
1997 | #define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \ |
1998 | list_t *things##_cfg=dict_lookup(dict,dictkey); \ | |
1999 | if (!things##_cfg) \ | |
2000 | cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \ | |
2001 | st->nthings=list_length(things##_cfg); \ | |
b4ececfc | 2002 | NEW_ARY(st->things,st->nthings); \ |
5b5f297f IJ |
2003 | assert(st->nthings); \ |
2004 | for (i=0; i<st->nthings; i++) { \ | |
2005 | item_t *item=list_elem(things##_cfg,i); \ | |
2006 | if (item->type!=t_closure) \ | |
2007 | cfgfatal(loc,"site","%s is not a closure\n",dictkey); \ | |
2008 | closure_t *cl=item->data.closure; \ | |
2009 | if (cl->type!=CL_TYPE) \ | |
2010 | cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \ | |
2011 | st->things[i]=cl->interface; \ | |
2012 | } \ | |
2013 | }while(0) | |
2014 | ||
2015 | GET_CLOSURE_LIST("comm",comms,ncomms,CL_COMM); | |
59533c16 | 2016 | |
2fe58dfd SE |
2017 | st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); |
2018 | st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); | |
2019 | st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc); | |
2020 | ||
2fe58dfd | 2021 | st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc); |
83dbdd3f IJ |
2022 | st->addresses=dict_read_string_array(dict,"address",False,"site",loc,0); |
2023 | if (st->addresses) | |
3454dce4 SE |
2024 | st->remoteport=dict_read_number(dict,"port",True,"site",loc,0); |
2025 | else st->remoteport=0; | |
2fe58dfd SE |
2026 | st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); |
2027 | ||
5b5f297f | 2028 | GET_CLOSURE_LIST("transform",transforms,ntransforms,CL_TRANSFORM); |
2fe58dfd SE |
2029 | |
2030 | st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); | |
2031 | st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); | |
2032 | ||
0391d9ee | 2033 | #define DEFAULT(D) (st->peer_mobile || st->local_mobile \ |
e57264d6 | 2034 | ? DEFAULT_MOBILE_##D : DEFAULT_##D) |
e7f8ec2a | 2035 | #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D)); |
c27ca22f | 2036 | |
e7f8ec2a IJ |
2037 | st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME); |
2038 | st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES); | |
2039 | st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL); | |
2040 | st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME); | |
3ed1846a | 2041 | st->mtu_target= dict_read_number(dict,"mtu-target",False,"site",loc,0); |
e7f8ec2a | 2042 | |
446353cd IJ |
2043 | st->mobile_peer_expiry= dict_read_number( |
2044 | dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY); | |
2045 | ||
0f27325c IJ |
2046 | const char *peerskey= st->peer_mobile |
2047 | ? "mobile-peers-max" : "static-peers-max"; | |
2048 | st->transport_peers_max= dict_read_number( | |
83dbdd3f | 2049 | dict,peerskey,False,"site",loc, st->addresses ? 4 : 3); |
446353cd | 2050 | if (st->transport_peers_max<1 || |
0f27325c IJ |
2051 | st->transport_peers_max>MAX_PEER_ADDRS) { |
2052 | cfgfatal(loc,"site", "%s must be in range 1.." | |
2053 | STRING(MAX_PEER_ADDRS) "\n", peerskey); | |
446353cd IJ |
2054 | } |
2055 | ||
e7f8ec2a | 2056 | if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2) |
c27ca22f IJ |
2057 | st->key_renegotiate_time=st->key_lifetime/2; |
2058 | else | |
e7f8ec2a | 2059 | st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP); |
9d3a4132 | 2060 | st->key_renegotiate_time=dict_read_number( |
cce0051f | 2061 | dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time); |
9d3a4132 SE |
2062 | if (st->key_renegotiate_time > st->key_lifetime) { |
2063 | cfgfatal(loc,"site", | |
2064 | "renegotiate-time must be less than key-lifetime\n"); | |
2065 | } | |
9d3a4132 SE |
2066 | |
2067 | st->log_events=string_list_to_word(dict_lookup(dict,"log-events"), | |
2068 | log_event_table,"site"); | |
2fe58dfd | 2069 | |
83dbdd3f | 2070 | st->resolving_count=0; |
dd9209d1 IJ |
2071 | st->allow_send_prod=0; |
2072 | ||
4efd681a SE |
2073 | st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5, |
2074 | "site_apply"); | |
2075 | sprintf(st->tunname,"%s<->%s",st->localname,st->remotename); | |
2076 | ||
2fe58dfd | 2077 | /* The information we expect to see in incoming messages of type 1 */ |
59230b9b IJ |
2078 | /* fixme: lots of unchecked overflows here, but the results are only |
2079 | corrupted packets rather than undefined behaviour */ | |
2fe58dfd SE |
2080 | st->setup_priority=(strcmp(st->localname,st->remotename)>0); |
2081 | ||
2082 | buffer_new(&st->buffer,SETUP_BUFFER_LEN); | |
2083 | ||
8aaaa634 | 2084 | buffer_new(&st->scratch,SETUP_BUFFER_LEN); |
05f39b4d IJ |
2085 | BUF_ALLOC(&st->scratch,"site:scratch"); |
2086 | ||
2fe58dfd SE |
2087 | /* We are interested in poll(), but only for timeouts. We don't have |
2088 | any fds of our own. */ | |
32fc582f | 2089 | register_for_poll(st, site_beforepoll, site_afterpoll, "site"); |
2fe58dfd SE |
2090 | st->timeout=0; |
2091 | ||
09a385fb | 2092 | st->remote_capabilities=0; |
5b5f297f | 2093 | st->chosen_transform=0; |
19e9a588 | 2094 | st->current.key_timeout=0; |
02b0959b | 2095 | st->auxiliary_key.key_timeout=0; |
446353cd IJ |
2096 | transport_peers_clear(st,&st->peers); |
2097 | transport_peers_clear(st,&st->setup_peers); | |
2fe58dfd SE |
2098 | /* XXX mlock these */ |
2099 | st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); | |
5b5f297f IJ |
2100 | st->sharedsecretlen=st->sharedsecretallocd=0; |
2101 | st->sharedsecret=0; | |
2102 | ||
5b5f297f IJ |
2103 | for (i=0; i<st->ntransforms; i++) { |
2104 | struct transform_if *ti=st->transforms[i]; | |
2105 | uint32_t capbit = 1UL << ti->capab_transformnum; | |
2106 | if (st->local_capabilities & capbit) | |
2107 | slog(st,LOG_ERROR,"transformnum capability bit" | |
2108 | " %d (%#"PRIx32") reused", ti->capab_transformnum, capbit); | |
2109 | st->local_capabilities |= capbit; | |
59533c16 | 2110 | } |
59533c16 | 2111 | |
2fe58dfd | 2112 | /* We need to register the remote networks with the netlink device */ |
3ed1846a IJ |
2113 | uint32_t netlink_mtu; /* local virtual interface mtu */ |
2114 | st->netlink->reg(st->netlink->st, site_outgoing, st, &netlink_mtu); | |
2115 | if (!st->mtu_target) | |
2116 | st->mtu_target=netlink_mtu; | |
ff05a229 | 2117 | |
59533c16 IJ |
2118 | for (i=0; i<st->ncomms; i++) |
2119 | st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming); | |
2fe58dfd | 2120 | |
fcad4b0b IJ |
2121 | st->current.transform=0; |
2122 | st->auxiliary_key.transform=0; | |
2123 | st->new_transform=0; | |
bd98cd6b | 2124 | st->auxiliary_is_new=0; |
2fe58dfd SE |
2125 | |
2126 | enter_state_stop(st); | |
2127 | ||
794f2398 | 2128 | add_hook(PHASE_SHUTDOWN,site_phase_hook,st); |
32654a31 | 2129 | add_hook(PHASE_CHILDPERSIST,site_childpersist_clearkeys,st); |
794f2398 | 2130 | |
2fe58dfd SE |
2131 | return new_closure(&st->cl); |
2132 | } | |
2133 | ||
2fe58dfd SE |
2134 | void site_module(dict_t *dict) |
2135 | { | |
2136 | add_closure(dict,"site",site_apply); | |
2137 | } | |
446353cd IJ |
2138 | |
2139 | ||
2140 | /***** TRANSPORT PEERS definitions *****/ | |
2141 | ||
2142 | static void transport_peers_debug(struct site *st, transport_peers *dst, | |
2143 | const char *didwhat, | |
2144 | int nargs, const struct comm_addr *args, | |
2145 | size_t stride) { | |
2146 | int i; | |
2147 | char *argp; | |
2148 | ||
2149 | if (!(st->log_events & LOG_PEER_ADDRS)) | |
2150 | return; /* an optimisation */ | |
2151 | ||
2152 | slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d", | |
2153 | (dst==&st->peers ? "data" : | |
2154 | dst==&st->setup_peers ? "setup" : "UNKNOWN"), | |
2155 | didwhat, nargs, dst->npeers); | |
2156 | ||
2157 | for (i=0, argp=(void*)args; | |
2158 | i<nargs; | |
2159 | i++, (argp+=stride?stride:sizeof(*args))) { | |
2160 | const struct comm_addr *ca=(void*)argp; | |
2161 | slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s", | |
1a448682 | 2162 | i, comm_addr_to_string(ca)); |
446353cd IJ |
2163 | } |
2164 | for (i=0; i<dst->npeers; i++) { | |
2165 | struct timeval diff; | |
2166 | timersub(tv_now,&dst->peers[i].last,&diff); | |
2167 | const struct comm_addr *ca=&dst->peers[i].addr; | |
2168 | slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld", | |
1a448682 | 2169 | i, comm_addr_to_string(ca), |
446353cd IJ |
2170 | (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec); |
2171 | } | |
2172 | } | |
2173 | ||
446353cd IJ |
2174 | static void transport_peers_expire(struct site *st, transport_peers *peers) { |
2175 | /* peers must be sorted first */ | |
2176 | int previous_peers=peers->npeers; | |
2177 | struct timeval oldest; | |
2178 | oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry; | |
2179 | oldest.tv_usec = tv_now->tv_usec; | |
2180 | while (peers->npeers>1 && | |
2181 | timercmp(&peers->peers[peers->npeers-1].last, &oldest, <)) | |
2182 | peers->npeers--; | |
2183 | if (peers->npeers != previous_peers) | |
2184 | transport_peers_debug(st,peers,"expire", 0,0,0); | |
2185 | } | |
2186 | ||
51fc5a74 IJ |
2187 | static bool_t transport_peer_record_one(struct site *st, transport_peers *peers, |
2188 | const struct comm_addr *ca, | |
2189 | const struct timeval *tv) { | |
2190 | /* returns false if output is full */ | |
2191 | int search; | |
446353cd | 2192 | |
51fc5a74 IJ |
2193 | if (peers->npeers >= st->transport_peers_max) |
2194 | return 0; | |
446353cd | 2195 | |
51fc5a74 | 2196 | for (search=0; search<peers->npeers; search++) |
2093fb5c | 2197 | if (comm_addr_equal(&peers->peers[search].addr, ca)) |
51fc5a74 IJ |
2198 | return 1; |
2199 | ||
2200 | peers->peers[peers->npeers].addr = *ca; | |
2201 | peers->peers[peers->npeers].last = *tv; | |
2202 | peers->npeers++; | |
2203 | return 1; | |
2204 | } | |
2205 | ||
2206 | static void transport_record_peers(struct site *st, transport_peers *peers, | |
2207 | const struct comm_addr *addrs, int naddrs, | |
2208 | const char *m) { | |
2209 | /* We add addrs into peers. The new entries end up at the front | |
2210 | * and displace entries towards the end (perhaps even off the | |
2211 | * end). Any existing matching entries are moved up to the front. | |
2212 | * | |
2213 | * Caller must first call transport_peers_expire. */ | |
2214 | ||
2215 | if (naddrs==1 && peers->npeers>=1 && | |
2093fb5c | 2216 | comm_addr_equal(&addrs[0], &peers->peers[0].addr)) { |
51fc5a74 IJ |
2217 | /* optimisation, also avoids debug for trivial updates */ |
2218 | peers->peers[0].last = *tv_now; | |
2219 | return; | |
2220 | } | |
446353cd | 2221 | |
51fc5a74 IJ |
2222 | int old_npeers=peers->npeers; |
2223 | transport_peer old_peers[old_npeers]; | |
2224 | COPY_ARRAY(old_peers,peers->peers,old_npeers); | |
446353cd | 2225 | |
51fc5a74 IJ |
2226 | peers->npeers=0; |
2227 | int i; | |
2228 | for (i=0; i<naddrs; i++) { | |
2229 | if (!transport_peer_record_one(st,peers, &addrs[i], tv_now)) | |
2230 | break; | |
2231 | } | |
2232 | for (i=0; i<old_npeers; i++) { | |
2233 | const transport_peer *old=&old_peers[i]; | |
2234 | if (!transport_peer_record_one(st,peers, &old->addr, &old->last)) | |
2235 | break; | |
2236 | } | |
446353cd | 2237 | |
51fc5a74 IJ |
2238 | transport_peers_debug(st,peers,m, naddrs,addrs,0); |
2239 | } | |
2240 | ||
2241 | static void transport_expire_record_peers(struct site *st, | |
2242 | transport_peers *peers, | |
2243 | const struct comm_addr *addrs, | |
2244 | int naddrs, const char *m) { | |
2245 | /* Convenience function */ | |
2246 | transport_peers_expire(st,peers); | |
2247 | transport_record_peers(st,peers,addrs,naddrs,m); | |
446353cd IJ |
2248 | } |
2249 | ||
2250 | static bool_t transport_compute_setupinit_peers(struct site *st, | |
45a14422 IJ |
2251 | const struct comm_addr *configured_addrs /* 0 if none or not found */, |
2252 | int n_configured_addrs /* 0 if none or not found */, | |
a96fda35 | 2253 | const struct comm_addr *incoming_packet_addr /* 0 if none */) { |
45a14422 | 2254 | if (!n_configured_addrs && !incoming_packet_addr && |
dd9209d1 | 2255 | !transport_peers_valid(&st->peers)) |
446353cd IJ |
2256 | return False; |
2257 | ||
2258 | slog(st,LOG_SETUP_INIT, | |
45a14422 IJ |
2259 | "using: %d configured addr(s);%s %d old peer addrs(es)", |
2260 | n_configured_addrs, | |
a96fda35 | 2261 | incoming_packet_addr ? " incoming packet address;" : "", |
779837e1 | 2262 | st->peers.npeers); |
446353cd | 2263 | |
0f27325c IJ |
2264 | /* Non-mobile peers try addresses until one is plausible. The |
2265 | * effect is that this code always tries first the configured | |
2266 | * address if supplied, or otherwise the address of the incoming | |
2267 | * PROD, or finally the existing data peer if one exists; this is | |
2268 | * as desired. */ | |
446353cd IJ |
2269 | |
2270 | transport_peers_copy(st,&st->setup_peers,&st->peers); | |
51fc5a74 | 2271 | transport_peers_expire(st,&st->setup_peers); |
446353cd | 2272 | |
a96fda35 | 2273 | if (incoming_packet_addr) |
51fc5a74 IJ |
2274 | transport_record_peers(st,&st->setup_peers, |
2275 | incoming_packet_addr,1, "incoming"); | |
dd9209d1 | 2276 | |
45a14422 | 2277 | if (n_configured_addrs) |
51fc5a74 | 2278 | transport_record_peers(st,&st->setup_peers, |
45a14422 | 2279 | configured_addrs,n_configured_addrs, "setupinit"); |
446353cd IJ |
2280 | |
2281 | assert(transport_peers_valid(&st->setup_peers)); | |
2282 | return True; | |
2283 | } | |
2284 | ||
2285 | static void transport_setup_msgok(struct site *st, const struct comm_addr *a) { | |
2286 | if (st->peer_mobile) | |
51fc5a74 | 2287 | transport_expire_record_peers(st,&st->setup_peers,a,1,"setupmsg"); |
446353cd IJ |
2288 | } |
2289 | static void transport_data_msgok(struct site *st, const struct comm_addr *a) { | |
2290 | if (st->peer_mobile) | |
51fc5a74 | 2291 | transport_expire_record_peers(st,&st->peers,a,1,"datamsg"); |
446353cd IJ |
2292 | } |
2293 | ||
2294 | static int transport_peers_valid(transport_peers *peers) { | |
2295 | return peers->npeers; | |
2296 | } | |
2297 | static void transport_peers_clear(struct site *st, transport_peers *peers) { | |
2298 | peers->npeers= 0; | |
2299 | transport_peers_debug(st,peers,"clear",0,0,0); | |
2300 | } | |
2301 | static void transport_peers_copy(struct site *st, transport_peers *dst, | |
2302 | const transport_peers *src) { | |
2303 | dst->npeers=src->npeers; | |
4f28e77e | 2304 | COPY_ARRAY(dst->peers, src->peers, dst->npeers); |
446353cd | 2305 | transport_peers_debug(st,dst,"copy", |
a620a048 | 2306 | src->npeers, &src->peers->addr, sizeof(*src->peers)); |
446353cd IJ |
2307 | } |
2308 | ||
90d7e3ad | 2309 | static void transport_resolve_complete(struct site *st, |
45a14422 IJ |
2310 | const struct comm_addr *addrs, |
2311 | int naddrs) { | |
2312 | transport_expire_record_peers(st,&st->peers,addrs,naddrs, | |
2313 | "resolved data"); | |
2314 | transport_expire_record_peers(st,&st->setup_peers,addrs,naddrs, | |
2315 | "resolved setup"); | |
90d7e3ad IJ |
2316 | } |
2317 | ||
2318 | static void transport_resolve_complete_tardy(struct site *st, | |
45a14422 IJ |
2319 | const struct comm_addr *addrs, |
2320 | int naddrs) { | |
2321 | transport_expire_record_peers(st,&st->peers,addrs,naddrs, | |
2322 | "resolved tardily"); | |
90d7e3ad IJ |
2323 | } |
2324 | ||
027a218f IJ |
2325 | static void transport_peers__copy_by_mask(transport_peer *out, int *nout_io, |
2326 | unsigned mask, | |
2327 | const transport_peers *inp) { | |
2328 | /* out and in->peers may be the same region, or nonoverlapping */ | |
2329 | const transport_peer *in=inp->peers; | |
2330 | int slot; | |
2331 | for (slot=0; slot<inp->npeers; slot++) { | |
2332 | if (!(mask & (1U << slot))) | |
2333 | continue; | |
2334 | if (!(out==in && slot==*nout_io)) | |
2335 | COPY_OBJ(out[*nout_io], in[slot]); | |
2336 | (*nout_io)++; | |
2337 | } | |
2338 | } | |
2339 | ||
446353cd IJ |
2340 | void transport_xmit(struct site *st, transport_peers *peers, |
2341 | struct buffer_if *buf, bool_t candebug) { | |
2342 | int slot; | |
2343 | transport_peers_expire(st, peers); | |
027a218f | 2344 | unsigned failed=0; /* bitmask */ |
0f27325c | 2345 | assert(MAX_PEER_ADDRS < sizeof(unsigned)*CHAR_BIT); |
027a218f IJ |
2346 | |
2347 | int nfailed=0; | |
446353cd IJ |
2348 | for (slot=0; slot<peers->npeers; slot++) { |
2349 | transport_peer *peer=&peers->peers[slot]; | |
2350 | if (candebug) | |
2351 | dump_packet(st, buf, &peer->addr, False); | |
027a218f IJ |
2352 | bool_t ok = |
2353 | peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr); | |
2354 | if (!ok) { | |
2355 | failed |= 1U << slot; | |
2356 | nfailed++; | |
2357 | } | |
2358 | if (ok && !st->peer_mobile) | |
2359 | break; | |
2360 | } | |
2361 | /* Now we need to demote/delete failing addrs: if we are mobile we | |
2362 | * merely demote them; otherwise we delete them. */ | |
2363 | if (st->local_mobile) { | |
2364 | unsigned expected = ((1U << nfailed)-1) << (peers->npeers-nfailed); | |
2365 | /* `expected' has all the failures at the end already */ | |
2366 | if (failed != expected) { | |
2367 | int fslot=0; | |
2368 | transport_peer failedpeers[nfailed]; | |
2369 | transport_peers__copy_by_mask(failedpeers, &fslot, failed,peers); | |
2370 | assert(fslot == nfailed); | |
2371 | int wslot=0; | |
2372 | transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers); | |
2373 | assert(wslot+nfailed == peers->npeers); | |
2374 | COPY_ARRAY(peers->peers+wslot, failedpeers, nfailed); | |
2375 | } | |
2376 | } else { | |
2377 | if (failed && peers->npeers > 1) { | |
2378 | int wslot=0; | |
2379 | transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers); | |
2380 | peers->npeers=wslot; | |
2381 | } | |
446353cd IJ |
2382 | } |
2383 | } | |
2384 | ||
2385 | /***** END of transport peers declarations *****/ |