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 | |
9c6a8729 | 9 | * the Free Software Foundation; either version 3 of the License, or |
c215a4bc IJ |
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; | |
e6d6991c | 299 | bool_t keepalive; |
0391d9ee | 300 | bool_t local_mobile, peer_mobile; /* Mobile client support */ |
446353cd | 301 | int32_t transport_peers_max; |
ff05a229 | 302 | string_t tunname; /* localname<->remotename by default, used in logs */ |
83dbdd3f | 303 | cstring_t *addresses; /* DNS name or address(es) for bootstrapping, optional */ |
ff05a229 | 304 | int remoteport; /* Port for bootstrapping, optional */ |
3ed1846a | 305 | uint32_t mtu_target; |
2fe58dfd | 306 | struct netlink_if *netlink; |
59533c16 | 307 | struct comm_if **comms; |
5dfe538b | 308 | struct comm_clientinfo **commclientinfos; |
59533c16 | 309 | int ncomms; |
2fe58dfd SE |
310 | struct resolver_if *resolver; |
311 | struct log_if *log; | |
312 | struct random_if *random; | |
313 | struct rsaprivkey_if *privkey; | |
2fe58dfd | 314 | struct rsapubkey_if *pubkey; |
5b5f297f IJ |
315 | struct transform_if **transforms; |
316 | int ntransforms; | |
2fe58dfd SE |
317 | struct dh_if *dh; |
318 | struct hash_if *hash; | |
2fe58dfd | 319 | |
58650a70 | 320 | uint32_t index; /* Index of this site */ |
09a385fb | 321 | uint32_t local_capabilities; |
1caa23ff | 322 | int32_t setup_retries; /* How many times to send setup packets */ |
e7f8ec2a | 323 | int32_t setup_retry_interval; /* Initial timeout for setup packets */ |
f7a86234 | 324 | int32_t wait_timeout_mean; /* How long to wait if setup unsuccessful */ |
446353cd | 325 | int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */ |
4a8aed08 IJ |
326 | int32_t key_lifetime; /* How long a key lasts once set up */ |
327 | int32_t key_renegotiate_time; /* If we see traffic (or a keepalive) | |
9d3a4132 SE |
328 | after this time, initiate a new |
329 | key exchange */ | |
2fe58dfd | 330 | |
ffafab08 | 331 | bool_t our_name_later; /* our name > peer name */ |
2fe58dfd SE |
332 | uint32_t log_events; |
333 | ||
334 | /* runtime information */ | |
335 | uint32_t state; | |
336 | uint64_t now; /* Most recently seen time */ | |
dd9209d1 | 337 | bool_t allow_send_prod; |
8b978d45 | 338 | bool_t msg1_crossed_logged; |
83dbdd3f IJ |
339 | int resolving_count; |
340 | int resolving_n_results_all; | |
341 | int resolving_n_results_stored; | |
342 | struct comm_addr resolving_results[MAX_PEER_ADDRS]; | |
2fe58dfd | 343 | |
ff05a229 | 344 | /* The currently established session */ |
19e9a588 | 345 | struct data_key current; |
02b0959b | 346 | struct data_key auxiliary_key; |
bd98cd6b | 347 | bool_t auxiliary_is_new; |
ff05a229 | 348 | uint64_t renegotiate_key_time; /* When we can negotiate a new key */ |
bd98cd6b | 349 | uint64_t auxiliary_renegotiate_key_time; |
446353cd | 350 | transport_peers peers; /* Current address(es) of peer for data traffic */ |
2fe58dfd | 351 | |
ff05a229 SE |
352 | /* The current key setup protocol exchange. We can only be |
353 | involved in one of these at a time. There's a potential for | |
354 | denial of service here (the attacker keeps sending a setup | |
355 | packet; we keep trying to continue the exchange, and have to | |
356 | timeout before we can listen for another setup packet); perhaps | |
357 | we should keep a list of 'bad' sources for setup packets. */ | |
09a385fb | 358 | uint32_t remote_capabilities; |
3ed1846a | 359 | uint16_t remote_adv_mtu; |
5b5f297f | 360 | struct transform_if *chosen_transform; |
2fe58dfd | 361 | uint32_t setup_session_id; |
446353cd | 362 | transport_peers setup_peers; |
2fe58dfd SE |
363 | uint8_t localN[NONCELEN]; /* Nonces for key exchange */ |
364 | uint8_t remoteN[NONCELEN]; | |
365 | struct buffer_if buffer; /* Current outgoing key exchange packet */ | |
05f39b4d | 366 | struct buffer_if scratch; |
4a8aed08 | 367 | int32_t retries; /* Number of retries remaining */ |
2fe58dfd SE |
368 | uint64_t timeout; /* Timeout for current state */ |
369 | uint8_t *dhsecret; | |
370 | uint8_t *sharedsecret; | |
5b5f297f | 371 | uint32_t sharedsecretlen, sharedsecretallocd; |
2fe58dfd SE |
372 | struct transform_inst_if *new_transform; /* For key setup/verify */ |
373 | }; | |
374 | ||
8368df34 IJ |
375 | static uint32_t event_log_priority(struct site *st, uint32_t event) |
376 | { | |
377 | if (!(event&st->log_events)) | |
378 | return 0; | |
379 | switch(event) { | |
380 | case LOG_UNEXPECTED: return M_INFO; | |
381 | case LOG_SETUP_INIT: return M_INFO; | |
382 | case LOG_SETUP_TIMEOUT: return M_NOTICE; | |
383 | case LOG_ACTIVATE_KEY: return M_INFO; | |
384 | case LOG_TIMEOUT_KEY: return M_INFO; | |
385 | case LOG_SEC: return M_SECURITY; | |
386 | case LOG_STATE: return M_DEBUG; | |
387 | case LOG_DROP: return M_DEBUG; | |
388 | case LOG_DUMP: return M_DEBUG; | |
389 | case LOG_ERROR: return M_ERR; | |
390 | case LOG_PEER_ADDRS: return M_DEBUG; | |
391 | default: return M_ERR; | |
392 | } | |
393 | } | |
394 | ||
0237c848 IJ |
395 | static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap) |
396 | FORMAT(printf,3,0); | |
397 | static void vslog(struct site *st, uint32_t event, cstring_t msg, va_list ap) | |
2fe58dfd | 398 | { |
b2a56f7c | 399 | uint32_t class; |
2fe58dfd | 400 | |
8368df34 IJ |
401 | class=event_log_priority(st, event); |
402 | if (class) { | |
e5d8c16e IJ |
403 | slilog_part(st->log,class,"%s: ",st->tunname); |
404 | vslilog_part(st->log,class,msg,ap); | |
405 | slilog_part(st->log,class,"\n"); | |
2fe58dfd | 406 | } |
2fe58dfd SE |
407 | } |
408 | ||
0237c848 IJ |
409 | static void slog(struct site *st, uint32_t event, cstring_t msg, ...) |
410 | FORMAT(printf,3,4); | |
411 | static void slog(struct site *st, uint32_t event, cstring_t msg, ...) | |
412 | { | |
413 | va_list ap; | |
414 | va_start(ap,msg); | |
415 | vslog(st,event,msg,ap); | |
416 | va_end(ap); | |
417 | } | |
418 | ||
4f3c75ac IJ |
419 | static void logtimeout(struct site *st, const char *fmt, ...) |
420 | FORMAT(printf,2,3); | |
421 | static void logtimeout(struct site *st, const char *fmt, ...) | |
422 | { | |
e9c9020e IJ |
423 | uint32_t class=event_log_priority(st,LOG_SETUP_TIMEOUT); |
424 | if (!class) | |
425 | return; | |
426 | ||
4f3c75ac IJ |
427 | va_list ap; |
428 | va_start(ap,fmt); | |
e9c9020e IJ |
429 | |
430 | slilog_part(st->log,class,"%s: ",st->tunname); | |
431 | vslilog_part(st->log,class,fmt,ap); | |
432 | ||
433 | const char *delim; | |
434 | int i; | |
435 | for (i=0, delim=" (tried "; | |
436 | i<st->setup_peers.npeers; | |
437 | i++, delim=", ") { | |
438 | transport_peer *peer=&st->setup_peers.peers[i]; | |
439 | const char *s=comm_addr_to_string(&peer->addr); | |
440 | slilog_part(st->log,class,"%s%s",delim,s); | |
441 | } | |
442 | ||
443 | slilog_part(st->log,class,")\n"); | |
4f3c75ac IJ |
444 | va_end(ap); |
445 | } | |
446 | ||
9d3a4132 | 447 | static void set_link_quality(struct site *st); |
1d388569 IJ |
448 | static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel); |
449 | static void delete_one_key(struct site *st, struct data_key *key, | |
450 | const char *reason /* may be 0 meaning don't log*/, | |
451 | const char *which /* ignored if !reasonn */, | |
452 | uint32_t loglevel /* ignored if !reasonn */); | |
dd9209d1 IJ |
453 | static bool_t initiate_key_setup(struct site *st, cstring_t reason, |
454 | const struct comm_addr *prod_hint); | |
2fe58dfd SE |
455 | static void enter_state_run(struct site *st); |
456 | static bool_t enter_state_resolve(struct site *st); | |
83dbdd3f | 457 | static void decrement_resolving_count(struct site *st, int by); |
ff05a229 | 458 | static bool_t enter_new_state(struct site *st,uint32_t next); |
2fe58dfd | 459 | static void enter_state_wait(struct site *st); |
05f39b4d | 460 | static void activate_new_key(struct site *st); |
2fe58dfd | 461 | |
0afd257e IJ |
462 | static bool_t is_transform_valid(struct transform_inst_if *transform) |
463 | { | |
fcad4b0b | 464 | return transform && transform->valid(transform->st); |
0afd257e IJ |
465 | } |
466 | ||
3d8d8f4e IJ |
467 | static bool_t current_valid(struct site *st) |
468 | { | |
0afd257e IJ |
469 | return is_transform_valid(st->current.transform); |
470 | } | |
471 | ||
472 | #define DEFINE_CALL_TRANSFORM(fwdrev) \ | |
14f78812 IJ |
473 | static transform_apply_return \ |
474 | call_transform_##fwdrev(struct site *st, \ | |
0afd257e IJ |
475 | struct transform_inst_if *transform, \ |
476 | struct buffer_if *buf, \ | |
477 | const char **errmsg) \ | |
478 | { \ | |
fcad4b0b IJ |
479 | if (!is_transform_valid(transform)) { \ |
480 | *errmsg="transform not set up"; \ | |
14f78812 | 481 | return transform_apply_err; \ |
fcad4b0b | 482 | } \ |
0afd257e | 483 | return transform->fwdrev(transform->st,buf,errmsg); \ |
3d8d8f4e IJ |
484 | } |
485 | ||
0afd257e IJ |
486 | DEFINE_CALL_TRANSFORM(forwards) |
487 | DEFINE_CALL_TRANSFORM(reverse) | |
488 | ||
489 | static void dispose_transform(struct transform_inst_if **transform_var) | |
490 | { | |
0afd257e | 491 | struct transform_inst_if *transform=*transform_var; |
fcad4b0b IJ |
492 | if (transform) { |
493 | transform->delkey(transform->st); | |
494 | transform->destroy(transform->st); | |
495 | } | |
496 | *transform_var = 0; | |
0afd257e IJ |
497 | } |
498 | ||
2fe58dfd SE |
499 | #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0) |
500 | #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0) | |
501 | #define CHECK_TYPE(b,t) do { uint32_t type; \ | |
502 | CHECK_AVAIL((b),4); \ | |
59635212 | 503 | type=buf_unprepend_uint32((b)); \ |
2fe58dfd SE |
504 | if (type!=(t)) return False; } while(0) |
505 | ||
3ed1846a IJ |
506 | static _Bool type_is_msg34(uint32_t type) |
507 | { | |
508 | return | |
509 | type == LABEL_MSG3 || | |
510 | type == LABEL_MSG3BIS || | |
511 | type == LABEL_MSG4; | |
512 | } | |
513 | ||
1737eeef IJ |
514 | struct parsedname { |
515 | int32_t len; | |
516 | uint8_t *name; | |
09a385fb | 517 | struct buffer_if extrainfo; |
1737eeef IJ |
518 | }; |
519 | ||
2fe58dfd SE |
520 | struct msg { |
521 | uint8_t *hashstart; | |
522 | uint32_t dest; | |
523 | uint32_t source; | |
1737eeef IJ |
524 | struct parsedname remote; |
525 | struct parsedname local; | |
09a385fb | 526 | uint32_t remote_capabilities; |
3ed1846a | 527 | uint16_t remote_mtu; |
5b5f297f | 528 | int capab_transformnum; |
2fe58dfd SE |
529 | uint8_t *nR; |
530 | uint8_t *nL; | |
1caa23ff | 531 | int32_t pklen; |
3e8addad | 532 | char *pk; |
1caa23ff IJ |
533 | int32_t hashlen; |
534 | int32_t siglen; | |
3e8addad | 535 | char *sig; |
2fe58dfd SE |
536 | }; |
537 | ||
f7a86234 | 538 | static int32_t wait_timeout(struct site *st) { |
19074a85 IJ |
539 | int32_t t = st->wait_timeout_mean; |
540 | int8_t factor; | |
541 | if (t < INT_MAX/2) { | |
542 | st->random->generate(st->random->st,sizeof(factor),&factor); | |
543 | t += (t / 256) * factor; | |
544 | } | |
545 | return t; | |
f7a86234 IJ |
546 | } |
547 | ||
6f0c71c5 | 548 | static _Bool set_new_transform(struct site *st, char *pk) |
0afd257e | 549 | { |
6f0c71c5 MW |
550 | _Bool ok; |
551 | ||
5b5f297f IJ |
552 | /* Make room for the shared key */ |
553 | st->sharedsecretlen=st->chosen_transform->keylen?:st->dh->ceil_len; | |
554 | assert(st->sharedsecretlen); | |
555 | if (st->sharedsecretlen > st->sharedsecretallocd) { | |
556 | st->sharedsecretallocd=st->sharedsecretlen; | |
c921f0c5 IJ |
557 | st->sharedsecret=safe_realloc_ary(st->sharedsecret,1, |
558 | st->sharedsecretallocd, | |
559 | "site:sharedsecret"); | |
5b5f297f | 560 | } |
5b5f297f IJ |
561 | |
562 | /* Generate the shared key */ | |
563 | st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,pk, | |
564 | st->sharedsecret,st->sharedsecretlen); | |
565 | ||
566 | /* Set up the transform */ | |
567 | struct transform_if *generator=st->chosen_transform; | |
fcad4b0b | 568 | struct transform_inst_if *generated=generator->create(generator->st); |
6f0c71c5 | 569 | ok = generated->setkey(generated->st,st->sharedsecret, |
ffafab08 | 570 | st->sharedsecretlen,st->our_name_later); |
6f0c71c5 | 571 | |
fcad4b0b | 572 | dispose_transform(&st->new_transform); |
6f0c71c5 | 573 | if (!ok) return False; |
fcad4b0b | 574 | st->new_transform=generated; |
5b5f297f IJ |
575 | |
576 | slog(st,LOG_SETUP_INIT,"key exchange negotiated transform" | |
577 | " %d (capabilities ours=%#"PRIx32" theirs=%#"PRIx32")", | |
578 | st->chosen_transform->capab_transformnum, | |
579 | st->local_capabilities, st->remote_capabilities); | |
6f0c71c5 | 580 | return True; |
0afd257e IJ |
581 | } |
582 | ||
09a385fb IJ |
583 | struct xinfoadd { |
584 | int32_t lenpos, afternul; | |
585 | }; | |
586 | static void append_string_xinfo_start(struct buffer_if *buf, | |
587 | struct xinfoadd *xia, | |
588 | const char *str) | |
589 | /* Helps construct one of the names with additional info as found | |
590 | * in MSG1..4. Call this function first, then append all the | |
591 | * desired extra info (not including the nul byte) to the buffer, | |
592 | * then call append_string_xinfo_done. */ | |
593 | { | |
594 | xia->lenpos = buf->size; | |
595 | buf_append_string(buf,str); | |
596 | buf_append_uint8(buf,0); | |
597 | xia->afternul = buf->size; | |
598 | } | |
599 | static void append_string_xinfo_done(struct buffer_if *buf, | |
600 | struct xinfoadd *xia) | |
601 | { | |
602 | /* we just need to adjust the string length */ | |
603 | if (buf->size == xia->afternul) { | |
604 | /* no extra info, strip the nul too */ | |
605 | buf_unappend_uint8(buf); | |
606 | } else { | |
607 | put_uint16(buf->start+xia->lenpos, buf->size-(xia->lenpos+2)); | |
608 | } | |
609 | } | |
610 | ||
ff05a229 SE |
611 | /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside |
612 | out using a transform of config data supplied by netlink */ | |
fe5e9cc4 | 613 | static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what) |
2fe58dfd SE |
614 | { |
615 | void *hst; | |
3b83c932 | 616 | uint8_t *hash; |
2fe58dfd SE |
617 | string_t dhpub, sig; |
618 | ||
619 | st->retries=st->setup_retries; | |
620 | BUF_ALLOC(&st->buffer,what); | |
621 | buffer_init(&st->buffer,0); | |
59635212 SE |
622 | buf_append_uint32(&st->buffer, |
623 | (type==LABEL_MSG1?0:st->setup_session_id)); | |
58650a70 | 624 | buf_append_uint32(&st->buffer,st->index); |
59635212 | 625 | buf_append_uint32(&st->buffer,type); |
09a385fb IJ |
626 | |
627 | struct xinfoadd xia; | |
628 | append_string_xinfo_start(&st->buffer,&xia,st->localname); | |
629 | if ((st->local_capabilities & CAPAB_EARLY) || (type != LABEL_MSG1)) { | |
630 | buf_append_uint32(&st->buffer,st->local_capabilities); | |
631 | } | |
3ed1846a IJ |
632 | if (type_is_msg34(type)) { |
633 | buf_append_uint16(&st->buffer,st->mtu_target); | |
634 | } | |
09a385fb IJ |
635 | append_string_xinfo_done(&st->buffer,&xia); |
636 | ||
2fe58dfd | 637 | buf_append_string(&st->buffer,st->remotename); |
4f28e77e | 638 | BUF_ADD_OBJ(append,&st->buffer,st->localN); |
2fe58dfd | 639 | if (type==LABEL_MSG1) return True; |
4f28e77e | 640 | BUF_ADD_OBJ(append,&st->buffer,st->remoteN); |
2fe58dfd | 641 | if (type==LABEL_MSG2) return True; |
3b83c932 SE |
642 | |
643 | if (hacky_par_mid_failnow()) return False; | |
644 | ||
5b5f297f IJ |
645 | if (type==LABEL_MSG3BIS) |
646 | buf_append_uint8(&st->buffer,st->chosen_transform->capab_transformnum); | |
647 | ||
2fe58dfd SE |
648 | dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len); |
649 | buf_append_string(&st->buffer,dhpub); | |
650 | free(dhpub); | |
3b83c932 | 651 | hash=safe_malloc(st->hash->len, "generate_msg"); |
2fe58dfd SE |
652 | hst=st->hash->init(); |
653 | st->hash->update(hst,st->buffer.start,st->buffer.size); | |
654 | st->hash->final(hst,hash); | |
655 | sig=st->privkey->sign(st->privkey->st,hash,st->hash->len); | |
656 | buf_append_string(&st->buffer,sig); | |
657 | free(sig); | |
3b83c932 | 658 | free(hash); |
2fe58dfd SE |
659 | return True; |
660 | } | |
661 | ||
1737eeef IJ |
662 | static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm) |
663 | { | |
664 | CHECK_AVAIL(msg,2); | |
665 | nm->len=buf_unprepend_uint16(msg); | |
666 | CHECK_AVAIL(msg,nm->len); | |
667 | nm->name=buf_unprepend(msg,nm->len); | |
668 | uint8_t *nul=memchr(nm->name,0,nm->len); | |
669 | if (!nul) { | |
09a385fb | 670 | buffer_readonly_view(&nm->extrainfo,0,0); |
1737eeef | 671 | } else { |
09a385fb | 672 | buffer_readonly_view(&nm->extrainfo, nul+1, msg->start-(nul+1)); |
1737eeef IJ |
673 | nm->len=nul-nm->name; |
674 | } | |
675 | return True; | |
676 | } | |
677 | ||
2fe58dfd SE |
678 | static bool_t unpick_msg(struct site *st, uint32_t type, |
679 | struct buffer_if *msg, struct msg *m) | |
680 | { | |
5b5f297f | 681 | m->capab_transformnum=-1; |
2fe58dfd SE |
682 | m->hashstart=msg->start; |
683 | CHECK_AVAIL(msg,4); | |
59635212 | 684 | m->dest=buf_unprepend_uint32(msg); |
2fe58dfd | 685 | CHECK_AVAIL(msg,4); |
59635212 | 686 | m->source=buf_unprepend_uint32(msg); |
2fe58dfd | 687 | CHECK_TYPE(msg,type); |
1737eeef | 688 | if (!unpick_name(msg,&m->remote)) return False; |
09a385fb | 689 | m->remote_capabilities=0; |
3ed1846a | 690 | m->remote_mtu=0; |
09a385fb IJ |
691 | if (m->remote.extrainfo.size) { |
692 | CHECK_AVAIL(&m->remote.extrainfo,4); | |
693 | m->remote_capabilities=buf_unprepend_uint32(&m->remote.extrainfo); | |
694 | } | |
3ed1846a IJ |
695 | if (type_is_msg34(type) && m->remote.extrainfo.size) { |
696 | CHECK_AVAIL(&m->remote.extrainfo,2); | |
697 | m->remote_mtu=buf_unprepend_uint16(&m->remote.extrainfo); | |
698 | } | |
1737eeef | 699 | if (!unpick_name(msg,&m->local)) return False; |
dd9209d1 IJ |
700 | if (type==LABEL_PROD) { |
701 | CHECK_EMPTY(msg); | |
702 | return True; | |
703 | } | |
2fe58dfd SE |
704 | CHECK_AVAIL(msg,NONCELEN); |
705 | m->nR=buf_unprepend(msg,NONCELEN); | |
706 | if (type==LABEL_MSG1) { | |
707 | CHECK_EMPTY(msg); | |
708 | return True; | |
709 | } | |
710 | CHECK_AVAIL(msg,NONCELEN); | |
711 | m->nL=buf_unprepend(msg,NONCELEN); | |
712 | if (type==LABEL_MSG2) { | |
713 | CHECK_EMPTY(msg); | |
714 | return True; | |
715 | } | |
5b5f297f IJ |
716 | if (type==LABEL_MSG3BIS) { |
717 | CHECK_AVAIL(msg,1); | |
718 | m->capab_transformnum = buf_unprepend_uint8(msg); | |
719 | } else { | |
720 | m->capab_transformnum = CAPAB_TRANSFORMNUM_ANCIENT; | |
721 | } | |
2fe58dfd | 722 | CHECK_AVAIL(msg,2); |
59635212 | 723 | m->pklen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
724 | CHECK_AVAIL(msg,m->pklen); |
725 | m->pk=buf_unprepend(msg,m->pklen); | |
726 | m->hashlen=msg->start-m->hashstart; | |
727 | CHECK_AVAIL(msg,2); | |
59635212 | 728 | m->siglen=buf_unprepend_uint16(msg); |
2fe58dfd SE |
729 | CHECK_AVAIL(msg,m->siglen); |
730 | m->sig=buf_unprepend(msg,m->siglen); | |
731 | CHECK_EMPTY(msg); | |
534fb389 MW |
732 | |
733 | /* In `process_msg3_msg4' below, we assume that we can write a nul | |
734 | * terminator following the signature. Make sure there's enough space. | |
735 | */ | |
736 | if (msg->start >= msg->base + msg->alloclen) | |
737 | return False; | |
738 | ||
2fe58dfd SE |
739 | return True; |
740 | } | |
741 | ||
1737eeef IJ |
742 | static bool_t name_matches(const struct parsedname *nm, const char *expected) |
743 | { | |
744 | int expected_len=strlen(expected); | |
745 | return | |
746 | nm->len == expected_len && | |
747 | !memcmp(nm->name, expected, expected_len); | |
748 | } | |
749 | ||
ff05a229 | 750 | static bool_t check_msg(struct site *st, uint32_t type, struct msg *m, |
fe5e9cc4 | 751 | cstring_t *error) |
ff05a229 SE |
752 | { |
753 | if (type==LABEL_MSG1) return True; | |
754 | ||
755 | /* Check that the site names and our nonce have been sent | |
756 | back correctly, and then store our peer's nonce. */ | |
1737eeef | 757 | if (!name_matches(&m->remote,st->remotename)) { |
ff05a229 SE |
758 | *error="wrong remote site name"; |
759 | return False; | |
760 | } | |
1737eeef | 761 | if (!name_matches(&m->local,st->localname)) { |
ff05a229 SE |
762 | *error="wrong local site name"; |
763 | return False; | |
764 | } | |
765 | if (memcmp(m->nL,st->localN,NONCELEN)!=0) { | |
766 | *error="wrong locally-generated nonce"; | |
767 | return False; | |
768 | } | |
769 | if (type==LABEL_MSG2) return True; | |
30ba82a5 | 770 | if (!consttime_memeq(m->nR,st->remoteN,NONCELEN)) { |
ff05a229 SE |
771 | *error="wrong remotely-generated nonce"; |
772 | return False; | |
773 | } | |
09a385fb IJ |
774 | /* MSG3 has complicated rules about capabilities, which are |
775 | * handled in process_msg3. */ | |
5b5f297f | 776 | if (type==LABEL_MSG3 || type==LABEL_MSG3BIS) return True; |
09a385fb IJ |
777 | if (m->remote_capabilities!=st->remote_capabilities) { |
778 | *error="remote capabilities changed"; | |
779 | return False; | |
780 | } | |
ff05a229 SE |
781 | if (type==LABEL_MSG4) return True; |
782 | *error="unknown message type"; | |
783 | return False; | |
784 | } | |
785 | ||
2fe58dfd SE |
786 | static bool_t generate_msg1(struct site *st) |
787 | { | |
788 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
789 | return generate_msg(st,LABEL_MSG1,"site:MSG1"); | |
790 | } | |
791 | ||
792 | static bool_t process_msg1(struct site *st, struct buffer_if *msg1, | |
7e29719e | 793 | const struct comm_addr *src, struct msg *m) |
2fe58dfd | 794 | { |
2fe58dfd SE |
795 | /* We've already determined we're in an appropriate state to |
796 | process an incoming MSG1, and that the MSG1 has correct values | |
797 | of A and B. */ | |
798 | ||
7e29719e | 799 | st->setup_session_id=m->source; |
09a385fb | 800 | st->remote_capabilities=m->remote_capabilities; |
7e29719e | 801 | memcpy(st->remoteN,m->nR,NONCELEN); |
2fe58dfd SE |
802 | return True; |
803 | } | |
804 | ||
805 | static bool_t generate_msg2(struct site *st) | |
806 | { | |
807 | st->random->generate(st->random->st,NONCELEN,st->localN); | |
808 | return generate_msg(st,LABEL_MSG2,"site:MSG2"); | |
809 | } | |
810 | ||
811 | static bool_t process_msg2(struct site *st, struct buffer_if *msg2, | |
a15faeb2 | 812 | const struct comm_addr *src) |
2fe58dfd SE |
813 | { |
814 | struct msg m; | |
fe5e9cc4 | 815 | cstring_t err; |
2fe58dfd SE |
816 | |
817 | if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False; | |
ff05a229 SE |
818 | if (!check_msg(st,LABEL_MSG2,&m,&err)) { |
819 | slog(st,LOG_SEC,"msg2: %s",err); | |
2fe58dfd SE |
820 | return False; |
821 | } | |
822 | st->setup_session_id=m.source; | |
09a385fb | 823 | st->remote_capabilities=m.remote_capabilities; |
5b5f297f IJ |
824 | |
825 | /* Select the transform to use */ | |
826 | ||
827 | uint32_t remote_transforms = st->remote_capabilities & CAPAB_TRANSFORM_MASK; | |
828 | if (!remote_transforms) | |
829 | /* old secnets only had this one transform */ | |
830 | remote_transforms = 1UL << CAPAB_TRANSFORMNUM_ANCIENT; | |
831 | ||
832 | struct transform_if *ti; | |
833 | int i; | |
834 | for (i=0; i<st->ntransforms; i++) { | |
835 | ti=st->transforms[i]; | |
836 | if ((1UL << ti->capab_transformnum) & remote_transforms) | |
837 | goto transform_found; | |
838 | } | |
839 | slog(st,LOG_ERROR,"no transforms in common" | |
840 | " (us %#"PRIx32"; them: %#"PRIx32")", | |
841 | st->local_capabilities & CAPAB_TRANSFORM_MASK, | |
842 | remote_transforms); | |
843 | return False; | |
844 | transform_found: | |
845 | st->chosen_transform=ti; | |
846 | ||
2fe58dfd SE |
847 | memcpy(st->remoteN,m.nR,NONCELEN); |
848 | return True; | |
849 | } | |
850 | ||
851 | static bool_t generate_msg3(struct site *st) | |
852 | { | |
853 | /* Now we have our nonce and their nonce. Think of a secret key, | |
854 | and create message number 3. */ | |
855 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
5b5f297f IJ |
856 | return generate_msg(st, |
857 | (st->remote_capabilities & CAPAB_TRANSFORM_MASK | |
858 | ? LABEL_MSG3BIS : LABEL_MSG3), | |
859 | "site:MSG3"); | |
2fe58dfd SE |
860 | } |
861 | ||
e001e8c0 IJ |
862 | static bool_t process_msg3_msg4(struct site *st, struct msg *m) |
863 | { | |
864 | uint8_t *hash; | |
865 | void *hst; | |
866 | ||
867 | /* Check signature and store g^x mod m */ | |
868 | hash=safe_malloc(st->hash->len, "process_msg3_msg4"); | |
869 | hst=st->hash->init(); | |
870 | st->hash->update(hst,m->hashstart,m->hashlen); | |
871 | st->hash->final(hst,hash); | |
534fb389 | 872 | /* Terminate signature with a '0' - already checked that this will fit */ |
e001e8c0 IJ |
873 | m->sig[m->siglen]=0; |
874 | if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m->sig)) { | |
875 | slog(st,LOG_SEC,"msg3/msg4 signature failed check!"); | |
876 | free(hash); | |
877 | return False; | |
878 | } | |
879 | free(hash); | |
880 | ||
3ed1846a IJ |
881 | st->remote_adv_mtu=m->remote_mtu; |
882 | ||
e001e8c0 IJ |
883 | return True; |
884 | } | |
885 | ||
2fe58dfd | 886 | static bool_t process_msg3(struct site *st, struct buffer_if *msg3, |
5b5f297f | 887 | const struct comm_addr *src, uint32_t msgtype) |
2fe58dfd SE |
888 | { |
889 | struct msg m; | |
fe5e9cc4 | 890 | cstring_t err; |
2fe58dfd | 891 | |
5b5f297f IJ |
892 | assert(msgtype==LABEL_MSG3 || msgtype==LABEL_MSG3BIS); |
893 | ||
894 | if (!unpick_msg(st,msgtype,msg3,&m)) return False; | |
895 | if (!check_msg(st,msgtype,&m,&err)) { | |
ff05a229 | 896 | slog(st,LOG_SEC,"msg3: %s",err); |
2fe58dfd SE |
897 | return False; |
898 | } | |
09a385fb IJ |
899 | uint32_t capab_adv_late = m.remote_capabilities |
900 | & ~st->remote_capabilities & CAPAB_EARLY; | |
901 | if (capab_adv_late) { | |
902 | slog(st,LOG_SEC,"msg3 impermissibly adds early capability flag(s)" | |
903 | " %#"PRIx32" (was %#"PRIx32", now %#"PRIx32")", | |
904 | capab_adv_late, st->remote_capabilities, m.remote_capabilities); | |
905 | return False; | |
906 | } | |
907 | st->remote_capabilities|=m.remote_capabilities; | |
ff05a229 | 908 | |
5b5f297f IJ |
909 | struct transform_if *ti; |
910 | int i; | |
911 | for (i=0; i<st->ntransforms; i++) { | |
912 | ti=st->transforms[i]; | |
913 | if (ti->capab_transformnum == m.capab_transformnum) | |
914 | goto transform_found; | |
915 | } | |
916 | slog(st,LOG_SEC,"peer chose unknown-to-us transform %d!", | |
917 | m.capab_transformnum); | |
918 | return False; | |
919 | transform_found: | |
920 | st->chosen_transform=ti; | |
921 | ||
e001e8c0 | 922 | if (!process_msg3_msg4(st,&m)) |
2fe58dfd | 923 | return False; |
2fe58dfd SE |
924 | |
925 | /* Terminate their DH public key with a '0' */ | |
926 | m.pk[m.pklen]=0; | |
927 | /* Invent our DH secret key */ | |
928 | st->random->generate(st->random->st,st->dh->len,st->dhsecret); | |
929 | ||
5b5f297f | 930 | /* Generate the shared key and set up the transform */ |
6f0c71c5 | 931 | if (!set_new_transform(st,m.pk)) return False; |
2fe58dfd SE |
932 | |
933 | return True; | |
934 | } | |
935 | ||
936 | static bool_t generate_msg4(struct site *st) | |
937 | { | |
938 | /* We have both nonces, their public key and our private key. Generate | |
939 | our public key, sign it and send it to them. */ | |
940 | return generate_msg(st,LABEL_MSG4,"site:MSG4"); | |
941 | } | |
942 | ||
943 | static bool_t process_msg4(struct site *st, struct buffer_if *msg4, | |
a15faeb2 | 944 | const struct comm_addr *src) |
2fe58dfd SE |
945 | { |
946 | struct msg m; | |
fe5e9cc4 | 947 | cstring_t err; |
2fe58dfd SE |
948 | |
949 | if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False; | |
ff05a229 SE |
950 | if (!check_msg(st,LABEL_MSG4,&m,&err)) { |
951 | slog(st,LOG_SEC,"msg4: %s",err); | |
2fe58dfd SE |
952 | return False; |
953 | } | |
954 | ||
e001e8c0 | 955 | if (!process_msg3_msg4(st,&m)) |
2fe58dfd | 956 | return False; |
2fe58dfd SE |
957 | |
958 | /* Terminate their DH public key with a '0' */ | |
959 | m.pk[m.pklen]=0; | |
5b5f297f IJ |
960 | |
961 | /* Generate the shared key and set up the transform */ | |
6f0c71c5 | 962 | if (!set_new_transform(st,m.pk)) return False; |
2fe58dfd SE |
963 | |
964 | return True; | |
965 | } | |
966 | ||
2fe58dfd SE |
967 | struct msg0 { |
968 | uint32_t dest; | |
969 | uint32_t source; | |
970 | uint32_t type; | |
971 | }; | |
972 | ||
973 | static bool_t unpick_msg0(struct site *st, struct buffer_if *msg0, | |
974 | struct msg0 *m) | |
975 | { | |
976 | CHECK_AVAIL(msg0,4); | |
59635212 | 977 | m->dest=buf_unprepend_uint32(msg0); |
2fe58dfd | 978 | CHECK_AVAIL(msg0,4); |
59635212 | 979 | m->source=buf_unprepend_uint32(msg0); |
2fe58dfd | 980 | CHECK_AVAIL(msg0,4); |
59635212 | 981 | m->type=buf_unprepend_uint32(msg0); |
2fe58dfd SE |
982 | return True; |
983 | /* Leaves transformed part of buffer untouched */ | |
984 | } | |
985 | ||
ff05a229 SE |
986 | static bool_t generate_msg5(struct site *st) |
987 | { | |
fe5e9cc4 | 988 | cstring_t transform_err; |
ff05a229 SE |
989 | |
990 | BUF_ALLOC(&st->buffer,"site:MSG5"); | |
991 | /* We are going to add four words to the message */ | |
3abd18e8 | 992 | buffer_init(&st->buffer,calculate_max_start_pad()); |
ff05a229 SE |
993 | /* Give the netlink code an opportunity to put its own stuff in the |
994 | message (configuration information, etc.) */ | |
ff05a229 | 995 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
0afd257e IJ |
996 | if (call_transform_forwards(st,st->new_transform, |
997 | &st->buffer,&transform_err)) | |
998 | return False; | |
ff05a229 | 999 | buf_prepend_uint32(&st->buffer,LABEL_MSG5); |
58650a70 | 1000 | buf_prepend_uint32(&st->buffer,st->index); |
ff05a229 SE |
1001 | buf_prepend_uint32(&st->buffer,st->setup_session_id); |
1002 | ||
1003 | st->retries=st->setup_retries; | |
1004 | return True; | |
1005 | } | |
1006 | ||
2fe58dfd | 1007 | static bool_t process_msg5(struct site *st, struct buffer_if *msg5, |
c90cc2a7 IJ |
1008 | const struct comm_addr *src, |
1009 | struct transform_inst_if *transform) | |
2fe58dfd SE |
1010 | { |
1011 | struct msg0 m; | |
fe5e9cc4 | 1012 | cstring_t transform_err; |
2fe58dfd SE |
1013 | |
1014 | if (!unpick_msg0(st,msg5,&m)) return False; | |
1015 | ||
0afd257e | 1016 | if (call_transform_reverse(st,transform,msg5,&transform_err)) { |
2fe58dfd | 1017 | /* There's a problem */ |
59635212 | 1018 | slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err); |
2fe58dfd SE |
1019 | return False; |
1020 | } | |
1021 | /* Buffer should now contain untransformed PING packet data */ | |
1022 | CHECK_AVAIL(msg5,4); | |
59635212 | 1023 | if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) { |
ff05a229 | 1024 | slog(st,LOG_SEC,"MSG5/PING packet contained wrong label"); |
2fe58dfd SE |
1025 | return False; |
1026 | } | |
ff7cdc9e IJ |
1027 | /* Older versions of secnet used to write some config data here |
1028 | * which we ignore. So we don't CHECK_EMPTY */ | |
2fe58dfd SE |
1029 | return True; |
1030 | } | |
1031 | ||
c90cc2a7 IJ |
1032 | static void create_msg6(struct site *st, struct transform_inst_if *transform, |
1033 | uint32_t session_id) | |
2fe58dfd | 1034 | { |
fe5e9cc4 | 1035 | cstring_t transform_err; |
2fe58dfd SE |
1036 | |
1037 | BUF_ALLOC(&st->buffer,"site:MSG6"); | |
ff05a229 | 1038 | /* We are going to add four words to the message */ |
3abd18e8 | 1039 | buffer_init(&st->buffer,calculate_max_start_pad()); |
794f2398 SE |
1040 | /* Give the netlink code an opportunity to put its own stuff in the |
1041 | message (configuration information, etc.) */ | |
ff05a229 | 1042 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
14f78812 IJ |
1043 | transform_apply_return problem = |
1044 | call_transform_forwards(st,transform, | |
1045 | &st->buffer,&transform_err); | |
0afd257e | 1046 | assert(!problem); |
59635212 | 1047 | buf_prepend_uint32(&st->buffer,LABEL_MSG6); |
58650a70 | 1048 | buf_prepend_uint32(&st->buffer,st->index); |
c90cc2a7 IJ |
1049 | buf_prepend_uint32(&st->buffer,session_id); |
1050 | } | |
2fe58dfd | 1051 | |
c90cc2a7 IJ |
1052 | static bool_t generate_msg6(struct site *st) |
1053 | { | |
0afd257e IJ |
1054 | if (!is_transform_valid(st->new_transform)) |
1055 | return False; | |
c90cc2a7 | 1056 | create_msg6(st,st->new_transform,st->setup_session_id); |
ff05a229 | 1057 | st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */ |
2fe58dfd SE |
1058 | return True; |
1059 | } | |
1060 | ||
1061 | static bool_t process_msg6(struct site *st, struct buffer_if *msg6, | |
a15faeb2 | 1062 | const struct comm_addr *src) |
2fe58dfd SE |
1063 | { |
1064 | struct msg0 m; | |
fe5e9cc4 | 1065 | cstring_t transform_err; |
2fe58dfd SE |
1066 | |
1067 | if (!unpick_msg0(st,msg6,&m)) return False; | |
1068 | ||
0afd257e | 1069 | if (call_transform_reverse(st,st->new_transform,msg6,&transform_err)) { |
2fe58dfd | 1070 | /* There's a problem */ |
59635212 | 1071 | slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err); |
2fe58dfd SE |
1072 | return False; |
1073 | } | |
1074 | /* Buffer should now contain untransformed PING packet data */ | |
1075 | CHECK_AVAIL(msg6,4); | |
59635212 SE |
1076 | if (buf_unprepend_uint32(msg6)!=LABEL_MSG6) { |
1077 | slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data"); | |
2fe58dfd SE |
1078 | return False; |
1079 | } | |
ff7cdc9e IJ |
1080 | /* Older versions of secnet used to write some config data here |
1081 | * which we ignore. So we don't CHECK_EMPTY */ | |
2fe58dfd SE |
1082 | return True; |
1083 | } | |
1084 | ||
3cdb830c IJ |
1085 | static transform_apply_return |
1086 | decrypt_msg0(struct site *st, struct buffer_if *msg0, | |
48b97423 | 1087 | const struct comm_addr *src) |
2fe58dfd | 1088 | { |
02b0959b | 1089 | cstring_t transform_err, auxkey_err, newkey_err="n/a"; |
065e1922 | 1090 | struct msg0 m; |
14f78812 | 1091 | transform_apply_return problem; |
2fe58dfd | 1092 | |
2fe58dfd SE |
1093 | if (!unpick_msg0(st,msg0,&m)) return False; |
1094 | ||
05f39b4d IJ |
1095 | /* Keep a copy so we can try decrypting it with multiple keys */ |
1096 | buffer_copy(&st->scratch, msg0); | |
1097 | ||
0afd257e IJ |
1098 | problem = call_transform_reverse(st,st->current.transform, |
1099 | msg0,&transform_err); | |
02b0959b | 1100 | if (!problem) { |
bd98cd6b IJ |
1101 | if (!st->auxiliary_is_new) |
1102 | delete_one_key(st,&st->auxiliary_key, | |
1103 | "peer has used new key","auxiliary key",LOG_SEC); | |
3cdb830c | 1104 | return 0; |
02b0959b | 1105 | } |
31dd0788 IJ |
1106 | if (transform_apply_return_badseq(problem)) |
1107 | goto badseq; | |
07e4774c | 1108 | |
02b0959b | 1109 | buffer_copy(msg0, &st->scratch); |
fcad4b0b IJ |
1110 | problem = call_transform_reverse(st,st->auxiliary_key.transform, |
1111 | msg0,&auxkey_err); | |
14f78812 | 1112 | if (!problem) { |
02b0959b | 1113 | slog(st,LOG_DROP,"processing packet which uses auxiliary key"); |
bd98cd6b IJ |
1114 | if (st->auxiliary_is_new) { |
1115 | /* We previously timed out in state SENTMSG5 but it turns | |
1116 | * out that our peer did in fact get our MSG5 and is | |
1117 | * using the new key. So we should switch to it too. */ | |
1118 | /* This is a bit like activate_new_key. */ | |
1119 | struct data_key t; | |
1120 | t=st->current; | |
1121 | st->current=st->auxiliary_key; | |
1122 | st->auxiliary_key=t; | |
1123 | ||
1124 | delete_one_key(st,&st->auxiliary_key,"peer has used new key", | |
1125 | "previous key",LOG_SEC); | |
1126 | st->auxiliary_is_new=0; | |
1127 | st->renegotiate_key_time=st->auxiliary_renegotiate_key_time; | |
1128 | } | |
3cdb830c | 1129 | return 0; |
02b0959b | 1130 | } |
31dd0788 IJ |
1131 | if (transform_apply_return_badseq(problem)) |
1132 | goto badseq; | |
02b0959b | 1133 | |
05f39b4d IJ |
1134 | if (st->state==SITE_SENTMSG5) { |
1135 | buffer_copy(msg0, &st->scratch); | |
0afd257e IJ |
1136 | problem = call_transform_reverse(st,st->new_transform, |
1137 | msg0,&newkey_err); | |
48b97423 | 1138 | if (!problem) { |
05f39b4d IJ |
1139 | /* It looks like we didn't get the peer's MSG6 */ |
1140 | /* This is like a cut-down enter_new_state(SITE_RUN) */ | |
1141 | slog(st,LOG_STATE,"will enter state RUN (MSG0 with new key)"); | |
1142 | BUF_FREE(&st->buffer); | |
1143 | st->timeout=0; | |
1144 | activate_new_key(st); | |
3cdb830c | 1145 | return 0; /* do process the data in this packet */ |
05f39b4d | 1146 | } |
31dd0788 IJ |
1147 | if (transform_apply_return_badseq(problem)) |
1148 | goto badseq; | |
05f39b4d IJ |
1149 | } |
1150 | ||
02b0959b IJ |
1151 | slog(st,LOG_SEC,"transform: %s (aux: %s, new: %s)", |
1152 | transform_err,auxkey_err,newkey_err); | |
dd9209d1 | 1153 | initiate_key_setup(st,"incoming message would not decrypt",0); |
48b97423 | 1154 | send_nak(src,m.dest,m.source,m.type,msg0,"message would not decrypt"); |
3cdb830c IJ |
1155 | assert(problem); |
1156 | return problem; | |
48b97423 | 1157 | |
31dd0788 IJ |
1158 | badseq: |
1159 | slog(st,LOG_DROP,"transform: %s (bad seq.)",transform_err); | |
37acaef1 IJ |
1160 | assert(problem); |
1161 | return problem; | |
065e1922 IJ |
1162 | } |
1163 | ||
1164 | static bool_t process_msg0(struct site *st, struct buffer_if *msg0, | |
1165 | const struct comm_addr *src) | |
1166 | { | |
1167 | uint32_t type; | |
3cdb830c | 1168 | transform_apply_return problem; |
065e1922 | 1169 | |
3cdb830c | 1170 | problem = decrypt_msg0(st,msg0,src); |
cbc25196 IJ |
1171 | if (problem==transform_apply_seqdupe) { |
1172 | /* We recently received another copy of this packet, maybe due | |
1173 | * to polypath. That's not a problem; indeed, for the | |
1174 | * purposes of transport address management it is a success. | |
1175 | * But we don't want to process the packet. */ | |
1176 | transport_data_msgok(st,src); | |
1177 | return False; | |
1178 | } | |
3cdb830c | 1179 | if (problem) |
065e1922 IJ |
1180 | return False; |
1181 | ||
2fe58dfd | 1182 | CHECK_AVAIL(msg0,4); |
59635212 | 1183 | type=buf_unprepend_uint32(msg0); |
2fe58dfd | 1184 | switch(type) { |
794f2398 SE |
1185 | case LABEL_MSG7: |
1186 | /* We must forget about the current session. */ | |
1d388569 | 1187 | delete_keys(st,"request from peer",LOG_SEC); |
e0d2e637 IJ |
1188 | /* probably, the peer is shutting down, and this is going to fail, |
1189 | * but we need to be trying to bring the link up again */ | |
1190 | if (st->keepalive) | |
1191 | initiate_key_setup(st,"peer requested key teardown",0); | |
794f2398 | 1192 | return True; |
2fe58dfd SE |
1193 | case LABEL_MSG9: |
1194 | /* Deliver to netlink layer */ | |
469fd1d9 | 1195 | st->netlink->deliver(st->netlink->st,msg0); |
446353cd | 1196 | transport_data_msgok(st,src); |
837cf01e IJ |
1197 | /* See whether we should start negotiating a new key */ |
1198 | if (st->now > st->renegotiate_key_time) | |
dd9209d1 | 1199 | initiate_key_setup(st,"incoming packet in renegotiation window",0); |
2fe58dfd | 1200 | return True; |
2fe58dfd | 1201 | default: |
ff05a229 SE |
1202 | slog(st,LOG_SEC,"incoming encrypted message of type %08x " |
1203 | "(unknown)",type); | |
2fe58dfd SE |
1204 | break; |
1205 | } | |
1206 | return False; | |
1207 | } | |
1208 | ||
1209 | static void dump_packet(struct site *st, struct buffer_if *buf, | |
62846523 IJ |
1210 | const struct comm_addr *addr, bool_t incoming, |
1211 | bool_t ok) | |
2fe58dfd | 1212 | { |
0a6cbade IJ |
1213 | uint32_t dest=get_uint32(buf->start); |
1214 | uint32_t source=get_uint32(buf->start+4); | |
1215 | uint32_t msgtype=get_uint32(buf->start+8); | |
2fe58dfd SE |
1216 | |
1217 | if (st->log_events & LOG_DUMP) | |
62846523 | 1218 | slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x: %s%s", |
040ee979 | 1219 | st->tunname,incoming?"incoming":"outgoing", |
62846523 IJ |
1220 | dest,source,msgtype,comm_addr_to_string(addr), |
1221 | ok?"":" - fail"); | |
2fe58dfd SE |
1222 | } |
1223 | ||
eff48c12 IJ |
1224 | static bool_t comm_addr_sendmsg(struct site *st, |
1225 | const struct comm_addr *dest, | |
1226 | struct buffer_if *buf) | |
1227 | { | |
5dfe538b IJ |
1228 | int i; |
1229 | struct comm_clientinfo *commclientinfo = 0; | |
1230 | ||
1231 | for (i=0; i < st->ncomms; i++) { | |
1232 | if (st->comms[i] == dest->comm) { | |
1233 | commclientinfo = st->commclientinfos[i]; | |
1234 | break; | |
1235 | } | |
1236 | } | |
1237 | return dest->comm->sendmsg(dest->comm->st, buf, dest, commclientinfo); | |
eff48c12 IJ |
1238 | } |
1239 | ||
2fe58dfd SE |
1240 | static uint32_t site_status(void *st) |
1241 | { | |
1242 | return 0; | |
1243 | } | |
1244 | ||
1245 | static bool_t send_msg(struct site *st) | |
1246 | { | |
1247 | if (st->retries>0) { | |
446353cd | 1248 | transport_xmit(st, &st->setup_peers, &st->buffer, True); |
e7f8ec2a | 1249 | st->timeout=st->now+st->setup_retry_interval; |
2fe58dfd SE |
1250 | st->retries--; |
1251 | return True; | |
bd98cd6b | 1252 | } else if (st->state==SITE_SENTMSG5) { |
4f3c75ac | 1253 | logtimeout(st,"timed out sending MSG5, stashing new key"); |
bd98cd6b IJ |
1254 | /* We stash the key we have produced, in case it turns out that |
1255 | * our peer did see our MSG5 after all and starts using it. */ | |
1256 | /* This is a bit like some of activate_new_key */ | |
1257 | struct transform_inst_if *t; | |
1258 | t=st->auxiliary_key.transform; | |
1259 | st->auxiliary_key.transform=st->new_transform; | |
1260 | st->new_transform=t; | |
0afd257e | 1261 | dispose_transform(&st->new_transform); |
bd98cd6b | 1262 | |
bd98cd6b IJ |
1263 | st->auxiliary_is_new=1; |
1264 | st->auxiliary_key.key_timeout=st->now+st->key_lifetime; | |
1265 | st->auxiliary_renegotiate_key_time=st->now+st->key_renegotiate_time; | |
1266 | st->auxiliary_key.remote_session_id=st->setup_session_id; | |
1267 | ||
1268 | enter_state_wait(st); | |
1269 | return False; | |
2fe58dfd | 1270 | } else { |
4f3c75ac | 1271 | logtimeout(st,"timed out sending key setup packet " |
3454dce4 | 1272 | "(in state %s)",state_name(st->state)); |
2fe58dfd SE |
1273 | enter_state_wait(st); |
1274 | return False; | |
1275 | } | |
1276 | } | |
1277 | ||
cc420616 | 1278 | static void site_resolve_callback(void *sst, const struct comm_addr *addrs, |
83dbdd3f | 1279 | int stored_naddrs, int all_naddrs, |
bc07424d | 1280 | const char *address, const char *failwhy) |
2fe58dfd SE |
1281 | { |
1282 | struct site *st=sst; | |
1283 | ||
83dbdd3f IJ |
1284 | if (!stored_naddrs) { |
1285 | slog(st,LOG_ERROR,"resolution of %s failed: %s",address,failwhy); | |
1286 | } else { | |
1287 | slog(st,LOG_PEER_ADDRS,"resolution of %s completed, %d addrs, eg: %s", | |
1288 | address, all_naddrs, comm_addr_to_string(&addrs[0]));; | |
1289 | ||
1290 | int space=st->transport_peers_max-st->resolving_n_results_stored; | |
1291 | int n_tocopy=MIN(stored_naddrs,space); | |
1292 | COPY_ARRAY(st->resolving_results + st->resolving_n_results_stored, | |
1293 | addrs, | |
1294 | n_tocopy); | |
1295 | st->resolving_n_results_stored += n_tocopy; | |
1296 | st->resolving_n_results_all += all_naddrs; | |
1297 | } | |
1298 | ||
1299 | decrement_resolving_count(st,1); | |
1300 | } | |
1301 | ||
1302 | static void decrement_resolving_count(struct site *st, int by) | |
1303 | { | |
1304 | assert(st->resolving_count>0); | |
1305 | st->resolving_count-=by; | |
1306 | ||
1307 | if (st->resolving_count) | |
1308 | return; | |
1309 | ||
1310 | /* OK, we are done with them all. Handle combined results. */ | |
1311 | ||
1312 | const struct comm_addr *addrs=st->resolving_results; | |
1313 | int naddrs=st->resolving_n_results_stored; | |
1314 | assert(naddrs<=st->transport_peers_max); | |
5c19b79c | 1315 | |
cc420616 | 1316 | if (naddrs) { |
83dbdd3f | 1317 | if (naddrs != st->resolving_n_results_all) { |
cc420616 IJ |
1318 | slog(st,LOG_SETUP_INIT,"resolution of supplied addresses/names" |
1319 | " yielded too many results (%d > %d), some ignored", | |
83dbdd3f | 1320 | st->resolving_n_results_all, naddrs); |
cc420616 | 1321 | } |
83dbdd3f | 1322 | slog(st,LOG_STATE,"resolution completed, %d addrs, eg: %s", |
d9d101ea | 1323 | naddrs, iaddr_to_string(&addrs[0].ia));; |
446353cd | 1324 | } |
c22c3541 IJ |
1325 | |
1326 | switch (st->state) { | |
1327 | case SITE_RESOLVE: | |
45a14422 | 1328 | if (transport_compute_setupinit_peers(st,addrs,naddrs,0)) { |
c22c3541 IJ |
1329 | enter_new_state(st,SITE_SENTMSG1); |
1330 | } else { | |
1331 | /* Can't figure out who to try to to talk to */ | |
1332 | slog(st,LOG_SETUP_INIT, | |
1333 | "key exchange failed: cannot find peer address"); | |
1334 | enter_state_run(st); | |
1335 | } | |
1336 | break; | |
1337 | case SITE_SENTMSG1: case SITE_SENTMSG2: | |
1338 | case SITE_SENTMSG3: case SITE_SENTMSG4: | |
1339 | case SITE_SENTMSG5: | |
45a14422 | 1340 | if (naddrs) { |
c22c3541 IJ |
1341 | /* We start using the address immediately for data too. |
1342 | * It's best to store it in st->peers now because we might | |
1343 | * go via SENTMSG5, WAIT, and a MSG0, straight into using | |
1344 | * the new key (without updating the data peer addrs). */ | |
45a14422 | 1345 | transport_resolve_complete(st,addrs,naddrs); |
c22c3541 IJ |
1346 | } else if (st->local_mobile) { |
1347 | /* We can't let this rest because we may have a peer | |
1348 | * address which will break in the future. */ | |
83dbdd3f IJ |
1349 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
1350 | "abandoning key exchange"); | |
c22c3541 IJ |
1351 | enter_state_wait(st); |
1352 | } else { | |
83dbdd3f | 1353 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
c22c3541 | 1354 | " continuing to use source address of peer's packets" |
83dbdd3f | 1355 | " for key exchange and ultimately data"); |
c22c3541 IJ |
1356 | } |
1357 | break; | |
1358 | case SITE_RUN: | |
45a14422 | 1359 | if (naddrs) { |
83dbdd3f IJ |
1360 | slog(st,LOG_SETUP_INIT,"resolution completed tardily," |
1361 | " updating peer address(es)"); | |
45a14422 | 1362 | transport_resolve_complete_tardy(st,addrs,naddrs); |
c22c3541 IJ |
1363 | } else if (st->local_mobile) { |
1364 | /* Not very good. We should queue (another) renegotiation | |
1365 | * so that we can update the peer address. */ | |
f7a86234 | 1366 | st->key_renegotiate_time=st->now+wait_timeout(st); |
c22c3541 | 1367 | } else { |
83dbdd3f IJ |
1368 | slog(st,LOG_SETUP_INIT,"resolution failed: " |
1369 | " continuing to use source address of peer's packets"); | |
c22c3541 IJ |
1370 | } |
1371 | break; | |
1372 | case SITE_WAIT: | |
1373 | case SITE_STOP: | |
1374 | /* oh well */ | |
1375 | break; | |
2fe58dfd SE |
1376 | } |
1377 | } | |
1378 | ||
dd9209d1 IJ |
1379 | static bool_t initiate_key_setup(struct site *st, cstring_t reason, |
1380 | const struct comm_addr *prod_hint) | |
9d3a4132 | 1381 | { |
77effe1d | 1382 | /* Reentrancy hazard: can call enter_new_state/enter_state_* */ |
9d3a4132 | 1383 | if (st->state!=SITE_RUN) return False; |
794f2398 | 1384 | slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason); |
83dbdd3f IJ |
1385 | if (st->addresses) { |
1386 | slog(st,LOG_SETUP_INIT,"resolving peer address(es)"); | |
9d3a4132 | 1387 | return enter_state_resolve(st); |
45a14422 | 1388 | } else if (transport_compute_setupinit_peers(st,0,0,prod_hint)) { |
ff05a229 | 1389 | return enter_new_state(st,SITE_SENTMSG1); |
9d3a4132 | 1390 | } |
ff05a229 | 1391 | slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer"); |
9d3a4132 SE |
1392 | return False; |
1393 | } | |
1394 | ||
2fe58dfd SE |
1395 | static void activate_new_key(struct site *st) |
1396 | { | |
1397 | struct transform_inst_if *t; | |
1398 | ||
02b0959b IJ |
1399 | /* We have three transform instances, which we swap between old, |
1400 | active and setup */ | |
1401 | t=st->auxiliary_key.transform; | |
1402 | st->auxiliary_key.transform=st->current.transform; | |
19e9a588 | 1403 | st->current.transform=st->new_transform; |
2fe58dfd | 1404 | st->new_transform=t; |
0afd257e | 1405 | dispose_transform(&st->new_transform); |
2fe58dfd | 1406 | |
2fe58dfd | 1407 | st->timeout=0; |
bd98cd6b | 1408 | st->auxiliary_is_new=0; |
02b0959b | 1409 | st->auxiliary_key.key_timeout=st->current.key_timeout; |
19e9a588 | 1410 | st->current.key_timeout=st->now+st->key_lifetime; |
ff05a229 | 1411 | st->renegotiate_key_time=st->now+st->key_renegotiate_time; |
446353cd | 1412 | transport_peers_copy(st,&st->peers,&st->setup_peers); |
19e9a588 | 1413 | st->current.remote_session_id=st->setup_session_id; |
2fe58dfd | 1414 | |
3ed1846a IJ |
1415 | /* Compute the inter-site MTU. This is min( our_mtu, their_mtu ). |
1416 | * But their mtu be unspecified, in which case we just use ours. */ | |
1417 | uint32_t intersite_mtu= | |
1418 | MIN(st->mtu_target, st->remote_adv_mtu ?: ~(uint32_t)0); | |
1419 | st->netlink->set_mtu(st->netlink->st,intersite_mtu); | |
1420 | ||
1421 | slog(st,LOG_ACTIVATE_KEY,"new key activated" | |
1422 | " (mtu ours=%"PRId32" theirs=%"PRId32" intersite=%"PRId32")", | |
1423 | st->mtu_target, st->remote_adv_mtu, intersite_mtu); | |
9d3a4132 | 1424 | enter_state_run(st); |
2fe58dfd SE |
1425 | } |
1426 | ||
1d388569 IJ |
1427 | static void delete_one_key(struct site *st, struct data_key *key, |
1428 | cstring_t reason, cstring_t which, uint32_t loglevel) | |
1429 | { | |
0afd257e | 1430 | if (!is_transform_valid(key->transform)) return; |
1d388569 | 1431 | if (reason) slog(st,loglevel,"%s deleted (%s)",which,reason); |
0afd257e | 1432 | dispose_transform(&key->transform); |
1d388569 IJ |
1433 | key->key_timeout=0; |
1434 | } | |
1435 | ||
1436 | static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel) | |
794f2398 | 1437 | { |
3d8d8f4e | 1438 | if (current_valid(st)) { |
794f2398 SE |
1439 | slog(st,loglevel,"session closed (%s)",reason); |
1440 | ||
1d388569 | 1441 | delete_one_key(st,&st->current,0,0,0); |
794f2398 SE |
1442 | set_link_quality(st); |
1443 | } | |
02b0959b | 1444 | delete_one_key(st,&st->auxiliary_key,0,0,0); |
794f2398 SE |
1445 | } |
1446 | ||
2fe58dfd SE |
1447 | static void state_assert(struct site *st, bool_t ok) |
1448 | { | |
4f5e39ec | 1449 | if (!ok) fatal("site:state_assert"); |
2fe58dfd SE |
1450 | } |
1451 | ||
1452 | static void enter_state_stop(struct site *st) | |
1453 | { | |
1454 | st->state=SITE_STOP; | |
1455 | st->timeout=0; | |
1d388569 | 1456 | delete_keys(st,"entering state STOP",LOG_TIMEOUT_KEY); |
0afd257e | 1457 | dispose_transform(&st->new_transform); |
2fe58dfd SE |
1458 | } |
1459 | ||
9d3a4132 SE |
1460 | static void set_link_quality(struct site *st) |
1461 | { | |
1462 | uint32_t quality; | |
3d8d8f4e | 1463 | if (current_valid(st)) |
9d3a4132 SE |
1464 | quality=LINK_QUALITY_UP; |
1465 | else if (st->state==SITE_WAIT || st->state==SITE_STOP) | |
1466 | quality=LINK_QUALITY_DOWN; | |
83dbdd3f | 1467 | else if (st->addresses) |
9d3a4132 | 1468 | quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS; |
446353cd | 1469 | else if (transport_peers_valid(&st->peers)) |
9d3a4132 SE |
1470 | quality=LINK_QUALITY_DOWN_STALE_ADDRESS; |
1471 | else | |
1472 | quality=LINK_QUALITY_DOWN; | |
1473 | ||
469fd1d9 | 1474 | st->netlink->set_quality(st->netlink->st,quality); |
9d3a4132 SE |
1475 | } |
1476 | ||
2fe58dfd SE |
1477 | static void enter_state_run(struct site *st) |
1478 | { | |
c02fba3b IJ |
1479 | slog(st,LOG_STATE,"entering state RUN%s", |
1480 | current_valid(st) ? " (keyed)" : " (unkeyed)"); | |
2fe58dfd SE |
1481 | st->state=SITE_RUN; |
1482 | st->timeout=0; | |
9d3a4132 | 1483 | |
ff05a229 | 1484 | st->setup_session_id=0; |
446353cd | 1485 | transport_peers_clear(st,&st->setup_peers); |
4f28e77e IJ |
1486 | FILLZERO(st->localN); |
1487 | FILLZERO(st->remoteN); | |
0afd257e | 1488 | dispose_transform(&st->new_transform); |
ff05a229 | 1489 | memset(st->dhsecret,0,st->dh->len); |
f7857c83 | 1490 | if (st->sharedsecret) memset(st->sharedsecret,0,st->sharedsecretlen); |
9d3a4132 | 1491 | set_link_quality(st); |
e6d6991c IJ |
1492 | |
1493 | if (st->keepalive && !current_valid(st)) | |
1494 | initiate_key_setup(st, "keepalive", 0); | |
2fe58dfd SE |
1495 | } |
1496 | ||
5c19b79c IJ |
1497 | static bool_t ensure_resolving(struct site *st) |
1498 | { | |
1499 | /* Reentrancy hazard: may call site_resolve_callback and hence | |
1500 | * enter_new_state, enter_state_* and generate_msg*. */ | |
83dbdd3f | 1501 | if (st->resolving_count) |
5c19b79c IJ |
1502 | return True; |
1503 | ||
83dbdd3f | 1504 | assert(st->addresses); |
4ac8a7d2 | 1505 | |
5c19b79c | 1506 | /* resolver->request might reentrantly call site_resolve_callback |
83dbdd3f IJ |
1507 | * which will decrement st->resolving, so we need to increment it |
1508 | * twice beforehand to prevent decrement from thinking we're | |
1509 | * finished, and decrement it ourselves. Alternatively if | |
1510 | * everything fails then there are no callbacks due and we simply | |
1511 | * set it to 0 and return false.. */ | |
1512 | st->resolving_n_results_stored=0; | |
1513 | st->resolving_n_results_all=0; | |
1514 | st->resolving_count+=2; | |
1515 | const char **addrp=st->addresses; | |
1516 | const char *address; | |
1517 | bool_t anyok=False; | |
1518 | for (; (address=*addrp++); ) { | |
1519 | bool_t ok = st->resolver->request(st->resolver->st,address, | |
1520 | st->remoteport,st->comms[0], | |
1521 | site_resolve_callback,st); | |
1522 | if (ok) | |
1523 | st->resolving_count++; | |
1524 | anyok|=ok; | |
1525 | } | |
1526 | if (!anyok) { | |
1527 | st->resolving_count=0; | |
1528 | return False; | |
1529 | } | |
1530 | decrement_resolving_count(st,2); | |
1531 | return True; | |
5c19b79c IJ |
1532 | } |
1533 | ||
2fe58dfd SE |
1534 | static bool_t enter_state_resolve(struct site *st) |
1535 | { | |
77effe1d | 1536 | /* Reentrancy hazard! See ensure_resolving. */ |
2fe58dfd SE |
1537 | state_assert(st,st->state==SITE_RUN); |
1538 | slog(st,LOG_STATE,"entering state RESOLVE"); | |
1539 | st->state=SITE_RESOLVE; | |
5c19b79c | 1540 | return ensure_resolving(st); |
2fe58dfd SE |
1541 | } |
1542 | ||
ff05a229 | 1543 | static bool_t enter_new_state(struct site *st, uint32_t next) |
2fe58dfd | 1544 | { |
ff05a229 | 1545 | bool_t (*gen)(struct site *st); |
3b83c932 SE |
1546 | int r; |
1547 | ||
ff05a229 SE |
1548 | slog(st,LOG_STATE,"entering state %s",state_name(next)); |
1549 | switch(next) { | |
1550 | case SITE_SENTMSG1: | |
1551 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE); | |
1552 | gen=generate_msg1; | |
8b978d45 | 1553 | st->msg1_crossed_logged = False; |
ff05a229 SE |
1554 | break; |
1555 | case SITE_SENTMSG2: | |
1556 | state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1557 | st->state==SITE_SENTMSG1 || st->state==SITE_WAIT); | |
1558 | gen=generate_msg2; | |
1559 | break; | |
1560 | case SITE_SENTMSG3: | |
1561 | state_assert(st,st->state==SITE_SENTMSG1); | |
1562 | BUF_FREE(&st->buffer); | |
1563 | gen=generate_msg3; | |
1564 | break; | |
1565 | case SITE_SENTMSG4: | |
1566 | state_assert(st,st->state==SITE_SENTMSG2); | |
1567 | BUF_FREE(&st->buffer); | |
1568 | gen=generate_msg4; | |
1569 | break; | |
1570 | case SITE_SENTMSG5: | |
1571 | state_assert(st,st->state==SITE_SENTMSG3); | |
1572 | BUF_FREE(&st->buffer); | |
1573 | gen=generate_msg5; | |
1574 | break; | |
1575 | case SITE_RUN: | |
1576 | state_assert(st,st->state==SITE_SENTMSG4); | |
1577 | BUF_FREE(&st->buffer); | |
1578 | gen=generate_msg6; | |
1579 | break; | |
1580 | default: | |
1581 | gen=NULL; | |
4f5e39ec | 1582 | fatal("enter_new_state(%s): invalid new state",state_name(next)); |
ff05a229 | 1583 | break; |
2fe58dfd | 1584 | } |
2fe58dfd | 1585 | |
3b83c932 SE |
1586 | if (hacky_par_start_failnow()) return False; |
1587 | ||
1588 | r= gen(st) && send_msg(st); | |
1589 | ||
1590 | hacky_par_end(&r, | |
e7f8ec2a | 1591 | st->setup_retries, st->setup_retry_interval, |
3b83c932 SE |
1592 | send_msg, st); |
1593 | ||
1594 | if (r) { | |
ff05a229 SE |
1595 | st->state=next; |
1596 | if (next==SITE_RUN) { | |
1597 | BUF_FREE(&st->buffer); /* Never reused */ | |
1598 | st->timeout=0; /* Never retransmit */ | |
1599 | activate_new_key(st); | |
1600 | } | |
2fe58dfd SE |
1601 | return True; |
1602 | } | |
ff05a229 SE |
1603 | slog(st,LOG_ERROR,"error entering state %s",state_name(next)); |
1604 | st->buffer.free=False; /* Unconditionally use the buffer; it may be | |
1605 | in either state, and enter_state_wait() will | |
1606 | do a BUF_FREE() */ | |
2fe58dfd SE |
1607 | enter_state_wait(st); |
1608 | return False; | |
1609 | } | |
1610 | ||
ff05a229 | 1611 | /* msg7 tells our peer that we're about to forget our key */ |
fe5e9cc4 | 1612 | static bool_t send_msg7(struct site *st, cstring_t reason) |
794f2398 | 1613 | { |
fe5e9cc4 | 1614 | cstring_t transform_err; |
794f2398 | 1615 | |
3d8d8f4e | 1616 | if (current_valid(st) && st->buffer.free |
446353cd | 1617 | && transport_peers_valid(&st->peers)) { |
794f2398 | 1618 | BUF_ALLOC(&st->buffer,"site:MSG7"); |
3abd18e8 | 1619 | buffer_init(&st->buffer,calculate_max_start_pad()); |
794f2398 SE |
1620 | buf_append_uint32(&st->buffer,LABEL_MSG7); |
1621 | buf_append_string(&st->buffer,reason); | |
0afd257e IJ |
1622 | if (call_transform_forwards(st, st->current.transform, |
1623 | &st->buffer, &transform_err)) | |
1624 | goto free_out; | |
794f2398 | 1625 | buf_prepend_uint32(&st->buffer,LABEL_MSG0); |
58650a70 | 1626 | buf_prepend_uint32(&st->buffer,st->index); |
19e9a588 | 1627 | buf_prepend_uint32(&st->buffer,st->current.remote_session_id); |
446353cd | 1628 | transport_xmit(st,&st->peers,&st->buffer,True); |
794f2398 | 1629 | BUF_FREE(&st->buffer); |
0afd257e | 1630 | free_out: |
794f2398 SE |
1631 | return True; |
1632 | } | |
1633 | return False; | |
1634 | } | |
1635 | ||
2fe58dfd SE |
1636 | /* We go into this state if our peer becomes uncommunicative. Similar to |
1637 | the "stop" state, we forget all session keys for a while, before | |
1638 | re-entering the "run" state. */ | |
1639 | static void enter_state_wait(struct site *st) | |
1640 | { | |
1641 | slog(st,LOG_STATE,"entering state WAIT"); | |
f7a86234 | 1642 | st->timeout=st->now+wait_timeout(st); |
2fe58dfd | 1643 | st->state=SITE_WAIT; |
9d3a4132 | 1644 | set_link_quality(st); |
2fe58dfd SE |
1645 | BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */ |
1646 | /* XXX Erase keys etc. */ | |
1647 | } | |
1648 | ||
dd9209d1 IJ |
1649 | static void generate_prod(struct site *st, struct buffer_if *buf) |
1650 | { | |
1651 | buffer_init(buf,0); | |
1652 | buf_append_uint32(buf,0); | |
1653 | buf_append_uint32(buf,0); | |
1654 | buf_append_uint32(buf,LABEL_PROD); | |
1655 | buf_append_string(buf,st->localname); | |
1656 | buf_append_string(buf,st->remotename); | |
1657 | } | |
1658 | ||
1659 | static void generate_send_prod(struct site *st, | |
1660 | const struct comm_addr *source) | |
1661 | { | |
1662 | if (!st->allow_send_prod) return; /* too soon */ | |
1663 | if (!(st->state==SITE_RUN || st->state==SITE_RESOLVE || | |
1664 | st->state==SITE_WAIT)) return; /* we'd ignore peer's MSG1 */ | |
1665 | ||
1666 | slog(st,LOG_SETUP_INIT,"prodding peer for key exchange"); | |
1667 | st->allow_send_prod=0; | |
1668 | generate_prod(st,&st->scratch); | |
eff48c12 | 1669 | bool_t ok = comm_addr_sendmsg(st, source, &st->scratch); |
62846523 | 1670 | dump_packet(st,&st->scratch,source,False,ok); |
dd9209d1 IJ |
1671 | } |
1672 | ||
16f73fa6 | 1673 | static inline void site_settimeout(uint64_t timeout, int *timeout_io) |
fe5e9cc4 SE |
1674 | { |
1675 | if (timeout) { | |
0009e60a IJ |
1676 | int64_t offset=timeout-*now; |
1677 | if (offset<0) offset=0; | |
fe5e9cc4 SE |
1678 | if (offset>INT_MAX) offset=INT_MAX; |
1679 | if (*timeout_io<0 || offset<*timeout_io) | |
1680 | *timeout_io=offset; | |
1681 | } | |
1682 | } | |
1683 | ||
2fe58dfd | 1684 | static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, |
90a39563 | 1685 | int *timeout_io) |
2fe58dfd SE |
1686 | { |
1687 | struct site *st=sst; | |
1688 | ||
ee697dd9 | 1689 | BEFOREPOLL_WANT_FDS(0); /* We don't use any file descriptors */ |
2fe58dfd SE |
1690 | st->now=*now; |
1691 | ||
1692 | /* Work out when our next timeout is. The earlier of 'timeout' or | |
19e9a588 | 1693 | 'current.key_timeout'. A stored value of '0' indicates no timeout |
2fe58dfd | 1694 | active. */ |
16f73fa6 | 1695 | site_settimeout(st->timeout, timeout_io); |
19e9a588 | 1696 | site_settimeout(st->current.key_timeout, timeout_io); |
02b0959b | 1697 | site_settimeout(st->auxiliary_key.key_timeout, timeout_io); |
2fe58dfd SE |
1698 | |
1699 | return 0; /* success */ | |
1700 | } | |
1701 | ||
1d388569 IJ |
1702 | static void check_expiry(struct site *st, struct data_key *key, |
1703 | const char *which) | |
1704 | { | |
1705 | if (key->key_timeout && *now>key->key_timeout) { | |
1706 | delete_one_key(st,key,"maximum life exceeded",which,LOG_TIMEOUT_KEY); | |
1707 | } | |
1708 | } | |
1709 | ||
2fe58dfd | 1710 | /* NB site_afterpoll will be called before site_beforepoll is ever called */ |
90a39563 | 1711 | static void site_afterpoll(void *sst, struct pollfd *fds, int nfds) |
2fe58dfd SE |
1712 | { |
1713 | struct site *st=sst; | |
1714 | ||
1715 | st->now=*now; | |
1716 | if (st->timeout && *now>st->timeout) { | |
2fe58dfd | 1717 | st->timeout=0; |
3b83c932 SE |
1718 | if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) { |
1719 | if (!hacky_par_start_failnow()) | |
1720 | send_msg(st); | |
1721 | } else if (st->state==SITE_WAIT) { | |
2fe58dfd SE |
1722 | enter_state_run(st); |
1723 | } else { | |
1724 | slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d", | |
1725 | st->state); | |
1726 | } | |
1727 | } | |
1d388569 | 1728 | check_expiry(st,&st->current,"current key"); |
02b0959b | 1729 | check_expiry(st,&st->auxiliary_key,"auxiliary key"); |
2fe58dfd SE |
1730 | } |
1731 | ||
1732 | /* This function is called by the netlink device to deliver packets | |
1733 | intended for the remote network. The packet is in "raw" wire | |
1734 | format, but is guaranteed to be word-aligned. */ | |
469fd1d9 | 1735 | static void site_outgoing(void *sst, struct buffer_if *buf) |
2fe58dfd SE |
1736 | { |
1737 | struct site *st=sst; | |
fe5e9cc4 | 1738 | cstring_t transform_err; |
2fe58dfd SE |
1739 | |
1740 | if (st->state==SITE_STOP) { | |
1741 | BUF_FREE(buf); | |
1742 | return; | |
1743 | } | |
1744 | ||
dd9209d1 IJ |
1745 | st->allow_send_prod=1; |
1746 | ||
2fe58dfd SE |
1747 | /* In all other states we consider delivering the packet if we have |
1748 | a valid key and a valid address to send it to. */ | |
3d8d8f4e | 1749 | if (current_valid(st) && transport_peers_valid(&st->peers)) { |
2fe58dfd | 1750 | /* Transform it and send it */ |
70dc107b SE |
1751 | if (buf->size>0) { |
1752 | buf_prepend_uint32(buf,LABEL_MSG9); | |
0afd257e IJ |
1753 | if (call_transform_forwards(st, st->current.transform, |
1754 | buf, &transform_err)) | |
1755 | goto free_out; | |
70dc107b | 1756 | buf_prepend_uint32(buf,LABEL_MSG0); |
58650a70 | 1757 | buf_prepend_uint32(buf,st->index); |
19e9a588 | 1758 | buf_prepend_uint32(buf,st->current.remote_session_id); |
446353cd | 1759 | transport_xmit(st,&st->peers,buf,False); |
70dc107b | 1760 | } |
0afd257e | 1761 | free_out: |
2fe58dfd SE |
1762 | BUF_FREE(buf); |
1763 | return; | |
1764 | } | |
1765 | ||
70dc107b | 1766 | slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size); |
2fe58dfd | 1767 | BUF_FREE(buf); |
dd9209d1 | 1768 | initiate_key_setup(st,"outgoing packet",0); |
2fe58dfd SE |
1769 | } |
1770 | ||
7e29719e IJ |
1771 | static bool_t named_for_us(struct site *st, const struct buffer_if *buf_in, |
1772 | uint32_t type, struct msg *m) | |
1773 | /* For packets which are identified by the local and remote names. | |
1774 | * If it has our name and our peer's name in it it's for us. */ | |
1775 | { | |
1776 | struct buffer_if buf[1]; | |
1777 | buffer_readonly_clone(buf,buf_in); | |
1778 | return unpick_msg(st,type,buf,m) | |
1779 | && name_matches(&m->remote,st->remotename) | |
1780 | && name_matches(&m->local,st->localname); | |
1781 | } | |
1782 | ||
67871f70 | 1783 | static bool_t we_have_priority(struct site *st, const struct msg *m) { |
4c795bdb MW |
1784 | if (st->local_capabilities & m->remote_capabilities & |
1785 | CAPAB_PRIORITY_MOBILE) { | |
b2de6bd2 IJ |
1786 | if (st->local_mobile) return True; |
1787 | if (st-> peer_mobile) return False; | |
1788 | } | |
67871f70 IJ |
1789 | return st->our_name_later; |
1790 | } | |
1791 | ||
db6534a3 IJ |
1792 | static bool_t setup_late_msg_ok(struct site *st, |
1793 | const struct buffer_if *buf_in, | |
1794 | uint32_t msgtype, | |
1795 | const struct comm_addr *source) { | |
1796 | /* For setup packets which seem from their type like they are | |
1797 | * late. Maybe they came via a different path. All we do is make | |
1798 | * a note of the sending address, iff they look like they are part | |
1799 | * of the current key setup attempt. */ | |
1800 | struct msg m; | |
1801 | if (!named_for_us(st,buf_in,msgtype,&m)) | |
1802 | /* named_for_us calls unpick_msg which gets the nonces */ | |
1803 | return False; | |
1804 | if (!consttime_memeq(m.nR,st->remoteN,NONCELEN) || | |
1805 | !consttime_memeq(m.nL,st->localN, NONCELEN)) | |
1806 | /* spoof ? from stale run ? who knows */ | |
1807 | return False; | |
1808 | transport_setup_msgok(st,source); | |
1809 | return True; | |
1810 | } | |
1811 | ||
2fe58dfd | 1812 | /* This function is called by the communication device to deliver |
dd9209d1 IJ |
1813 | packets from our peers. |
1814 | It should return True if the packet is recognised as being for | |
1815 | this current site instance (and should therefore not be processed | |
1816 | by other sites), even if the packet was otherwise ignored. */ | |
2fe58dfd | 1817 | static bool_t site_incoming(void *sst, struct buffer_if *buf, |
a15faeb2 | 1818 | const struct comm_addr *source) |
2fe58dfd SE |
1819 | { |
1820 | struct site *st=sst; | |
20138876 IJ |
1821 | |
1822 | if (buf->size < 12) return False; | |
1823 | ||
0a6cbade IJ |
1824 | uint32_t dest=get_uint32(buf->start); |
1825 | uint32_t msgtype=get_uint32(buf->start+8); | |
7e29719e IJ |
1826 | struct msg named_msg; |
1827 | ||
1828 | if (msgtype==LABEL_MSG1) { | |
1829 | if (!named_for_us(st,buf,msgtype,&named_msg)) | |
1830 | return False; | |
1831 | /* It's a MSG1 addressed to us. Decide what to do about it. */ | |
62846523 | 1832 | dump_packet(st,buf,source,True,True); |
7e29719e IJ |
1833 | if (st->state==SITE_RUN || st->state==SITE_RESOLVE || |
1834 | st->state==SITE_WAIT) { | |
1835 | /* We should definitely process it */ | |
45a14422 | 1836 | transport_compute_setupinit_peers(st,0,0,source); |
7e29719e IJ |
1837 | if (process_msg1(st,buf,source,&named_msg)) { |
1838 | slog(st,LOG_SETUP_INIT,"key setup initiated by peer"); | |
c22c3541 | 1839 | bool_t entered=enter_new_state(st,SITE_SENTMSG2); |
83dbdd3f | 1840 | if (entered && st->addresses && st->local_mobile) |
c22c3541 IJ |
1841 | /* We must do this as the very last thing, because |
1842 | the resolver callback might reenter us. */ | |
1843 | ensure_resolving(st); | |
7e29719e IJ |
1844 | } else { |
1845 | slog(st,LOG_ERROR,"failed to process incoming msg1"); | |
1846 | } | |
1847 | BUF_FREE(buf); | |
1848 | return True; | |
1849 | } else if (st->state==SITE_SENTMSG1) { | |
1850 | /* We've just sent a message 1! They may have crossed on | |
1851 | the wire. If we have priority then we ignore the | |
1852 | incoming one, otherwise we process it as usual. */ | |
67871f70 | 1853 | if (we_have_priority(st,&named_msg)) { |
7e29719e | 1854 | BUF_FREE(buf); |
8b978d45 | 1855 | if (!st->msg1_crossed_logged++) |
dea92314 | 1856 | slog(st,LOG_SETUP_INIT,"crossed msg1s; we are higher " |
8b978d45 | 1857 | "priority => ignore incoming msg1"); |
7e29719e IJ |
1858 | return True; |
1859 | } else { | |
dea92314 | 1860 | slog(st,LOG_SETUP_INIT,"crossed msg1s; we are lower " |
7e29719e IJ |
1861 | "priority => use incoming msg1"); |
1862 | if (process_msg1(st,buf,source,&named_msg)) { | |
1863 | BUF_FREE(&st->buffer); /* Free our old message 1 */ | |
c22c3541 | 1864 | transport_setup_msgok(st,source); |
ff05a229 | 1865 | enter_new_state(st,SITE_SENTMSG2); |
2fe58dfd | 1866 | } else { |
7e29719e IJ |
1867 | slog(st,LOG_ERROR,"failed to process an incoming " |
1868 | "crossed msg1 (we have low priority)"); | |
2fe58dfd SE |
1869 | } |
1870 | BUF_FREE(buf); | |
1871 | return True; | |
2fe58dfd | 1872 | } |
04c5c5d7 IJ |
1873 | } else if (st->state==SITE_SENTMSG2 || |
1874 | st->state==SITE_SENTMSG4) { | |
1875 | if (consttime_memeq(named_msg.nR,st->remoteN,NONCELEN)) { | |
1876 | /* We are ahead in the protocol, but that msg1 had the | |
1877 | * peer's nonce so presumably it is from this key | |
1878 | * exchange run, via a slower route */ | |
1879 | transport_setup_msgok(st,source); | |
1880 | } else { | |
1881 | slog(st,LOG_UNEXPECTED,"competing incoming message 1"); | |
1882 | } | |
1883 | BUF_FREE(buf); | |
1884 | return True; | |
2fe58dfd | 1885 | } |
7e29719e | 1886 | /* The message 1 was received at an unexpected stage of the |
04c5c5d7 | 1887 | key setup. Well, they lost the race. */ |
7e29719e IJ |
1888 | slog(st,LOG_UNEXPECTED,"unexpected incoming message 1"); |
1889 | BUF_FREE(buf); | |
1890 | return True; | |
2fe58dfd | 1891 | } |
dd9209d1 IJ |
1892 | if (msgtype==LABEL_PROD) { |
1893 | if (!named_for_us(st,buf,msgtype,&named_msg)) | |
1894 | return False; | |
62846523 | 1895 | dump_packet(st,buf,source,True,True); |
dd9209d1 IJ |
1896 | if (st->state!=SITE_RUN) { |
1897 | slog(st,LOG_DROP,"ignoring PROD when not in state RUN"); | |
1898 | } else if (current_valid(st)) { | |
1899 | slog(st,LOG_DROP,"ignoring PROD when we think we have a key"); | |
1900 | } else { | |
1901 | initiate_key_setup(st,"peer sent PROD packet",source); | |
1902 | } | |
1903 | BUF_FREE(buf); | |
1904 | return True; | |
1905 | } | |
58650a70 | 1906 | if (dest==st->index) { |
2fe58dfd | 1907 | /* Explicitly addressed to us */ |
62846523 | 1908 | if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True,True); |
2fe58dfd | 1909 | switch (msgtype) { |
136740e6 | 1910 | case LABEL_NAK: |
794f2398 SE |
1911 | /* If the source is our current peer then initiate a key setup, |
1912 | because our peer's forgotten the key */ | |
19e9a588 | 1913 | if (get_uint32(buf->start+4)==st->current.remote_session_id) { |
dd9209d1 | 1914 | bool_t initiated; |
e5e67212 | 1915 | initiated = initiate_key_setup(st,"received a NAK",source); |
dd9209d1 | 1916 | if (!initiated) generate_send_prod(st,source); |
794f2398 SE |
1917 | } else { |
1918 | slog(st,LOG_SEC,"bad incoming NAK"); | |
1919 | } | |
1920 | break; | |
2fe58dfd SE |
1921 | case LABEL_MSG0: |
1922 | process_msg0(st,buf,source); | |
1923 | break; | |
1924 | case LABEL_MSG1: | |
1925 | /* Setup packet: should not have been explicitly addressed | |
1926 | to us */ | |
59635212 | 1927 | slog(st,LOG_SEC,"incoming explicitly addressed msg1"); |
2fe58dfd SE |
1928 | break; |
1929 | case LABEL_MSG2: | |
1930 | /* Setup packet: expected only in state SENTMSG1 */ | |
1931 | if (st->state!=SITE_SENTMSG1) { | |
db6534a3 IJ |
1932 | if ((st->state==SITE_SENTMSG3 || |
1933 | st->state==SITE_SENTMSG5) && | |
1934 | setup_late_msg_ok(st,buf,msgtype,source)) | |
1935 | break; | |
2fe58dfd | 1936 | slog(st,LOG_UNEXPECTED,"unexpected MSG2"); |
446353cd IJ |
1937 | } else if (process_msg2(st,buf,source)) { |
1938 | transport_setup_msgok(st,source); | |
ff05a229 | 1939 | enter_new_state(st,SITE_SENTMSG3); |
446353cd | 1940 | } else { |
59635212 | 1941 | slog(st,LOG_SEC,"invalid MSG2"); |
2fe58dfd SE |
1942 | } |
1943 | break; | |
1944 | case LABEL_MSG3: | |
5b5f297f | 1945 | case LABEL_MSG3BIS: |
2fe58dfd SE |
1946 | /* Setup packet: expected only in state SENTMSG2 */ |
1947 | if (st->state!=SITE_SENTMSG2) { | |
db6534a3 IJ |
1948 | if ((st->state==SITE_SENTMSG4) && |
1949 | setup_late_msg_ok(st,buf,msgtype,source)) | |
1950 | break; | |
2fe58dfd | 1951 | slog(st,LOG_UNEXPECTED,"unexpected MSG3"); |
5b5f297f | 1952 | } else if (process_msg3(st,buf,source,msgtype)) { |
446353cd | 1953 | transport_setup_msgok(st,source); |
ff05a229 | 1954 | enter_new_state(st,SITE_SENTMSG4); |
446353cd | 1955 | } else { |
59635212 | 1956 | slog(st,LOG_SEC,"invalid MSG3"); |
2fe58dfd SE |
1957 | } |
1958 | break; | |
1959 | case LABEL_MSG4: | |
1960 | /* Setup packet: expected only in state SENTMSG3 */ | |
1961 | if (st->state!=SITE_SENTMSG3) { | |
db6534a3 IJ |
1962 | if ((st->state==SITE_SENTMSG5) && |
1963 | setup_late_msg_ok(st,buf,msgtype,source)) | |
1964 | break; | |
2fe58dfd | 1965 | slog(st,LOG_UNEXPECTED,"unexpected MSG4"); |
446353cd IJ |
1966 | } else if (process_msg4(st,buf,source)) { |
1967 | transport_setup_msgok(st,source); | |
ff05a229 | 1968 | enter_new_state(st,SITE_SENTMSG5); |
446353cd | 1969 | } else { |
59635212 | 1970 | slog(st,LOG_SEC,"invalid MSG4"); |
2fe58dfd SE |
1971 | } |
1972 | break; | |
1973 | case LABEL_MSG5: | |
4efd681a SE |
1974 | /* Setup packet: expected only in state SENTMSG4 */ |
1975 | /* (may turn up in state RUN if our return MSG6 was lost | |
1976 | and the new key has already been activated. In that | |
05f39b4d IJ |
1977 | case we discard it. The peer will realise that we |
1978 | are using the new key when they see our data packets. | |
1979 | Until then the peer's data packets to us get discarded. */ | |
c90cc2a7 IJ |
1980 | if (st->state==SITE_SENTMSG4) { |
1981 | if (process_msg5(st,buf,source,st->new_transform)) { | |
1982 | transport_setup_msgok(st,source); | |
1983 | enter_new_state(st,SITE_RUN); | |
1984 | } else { | |
1985 | slog(st,LOG_SEC,"invalid MSG5"); | |
1986 | } | |
1987 | } else if (st->state==SITE_RUN) { | |
19e9a588 | 1988 | if (process_msg5(st,buf,source,st->current.transform)) { |
c90cc2a7 IJ |
1989 | slog(st,LOG_DROP,"got MSG5, retransmitting MSG6"); |
1990 | transport_setup_msgok(st,source); | |
19e9a588 IJ |
1991 | create_msg6(st,st->current.transform, |
1992 | st->current.remote_session_id); | |
c90cc2a7 IJ |
1993 | transport_xmit(st,&st->peers,&st->buffer,True); |
1994 | BUF_FREE(&st->buffer); | |
1995 | } else { | |
1996 | slog(st,LOG_SEC,"invalid MSG5 (in state RUN)"); | |
1997 | } | |
2fe58dfd | 1998 | } else { |
c90cc2a7 | 1999 | slog(st,LOG_UNEXPECTED,"unexpected MSG5"); |
2fe58dfd SE |
2000 | } |
2001 | break; | |
2002 | case LABEL_MSG6: | |
2003 | /* Setup packet: expected only in state SENTMSG5 */ | |
2004 | if (st->state!=SITE_SENTMSG5) { | |
2005 | slog(st,LOG_UNEXPECTED,"unexpected MSG6"); | |
2006 | } else if (process_msg6(st,buf,source)) { | |
2007 | BUF_FREE(&st->buffer); /* Free message 5 */ | |
446353cd | 2008 | transport_setup_msgok(st,source); |
2fe58dfd SE |
2009 | activate_new_key(st); |
2010 | } else { | |
59635212 | 2011 | slog(st,LOG_SEC,"invalid MSG6"); |
2fe58dfd SE |
2012 | } |
2013 | break; | |
2fe58dfd | 2014 | default: |
59635212 | 2015 | slog(st,LOG_SEC,"received message of unknown type 0x%08x", |
2fe58dfd SE |
2016 | msgtype); |
2017 | break; | |
2018 | } | |
2019 | BUF_FREE(buf); | |
2020 | return True; | |
2021 | } | |
2022 | ||
2023 | return False; | |
2024 | } | |
2025 | ||
2026 | static void site_control(void *vst, bool_t run) | |
2027 | { | |
2028 | struct site *st=vst; | |
2029 | if (run) enter_state_run(st); | |
2030 | else enter_state_stop(st); | |
2031 | } | |
2032 | ||
794f2398 SE |
2033 | static void site_phase_hook(void *sst, uint32_t newphase) |
2034 | { | |
2035 | struct site *st=sst; | |
2036 | ||
2037 | /* The program is shutting down; tell our peer */ | |
2038 | send_msg7(st,"shutting down"); | |
2039 | } | |
2040 | ||
32654a31 IJ |
2041 | static void site_childpersist_clearkeys(void *sst, uint32_t newphase) |
2042 | { | |
2043 | struct site *st=sst; | |
2044 | dispose_transform(&st->current.transform); | |
2045 | dispose_transform(&st->auxiliary_key.transform); | |
2046 | dispose_transform(&st->new_transform); | |
2047 | /* Not much point overwiting the signing key, since we loaded it | |
2048 | from disk, and it is only valid prospectively if at all, | |
2049 | anyway. */ | |
2050 | /* XXX it would be best to overwrite the DH state, because that | |
2051 | _is_ relevant to forward secrecy. However we have no | |
2052 | convenient interface for doing that and in practice gmp has | |
2053 | probably dribbled droppings all over the malloc arena. A good | |
2054 | way to fix this would be to have a privsep child for asymmetric | |
2055 | crypto operations, but that's a task for another day. */ | |
2056 | } | |
2057 | ||
2fe58dfd SE |
2058 | static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context, |
2059 | list_t *args) | |
2060 | { | |
58650a70 | 2061 | static uint32_t index_sequence; |
2fe58dfd SE |
2062 | struct site *st; |
2063 | item_t *item; | |
2064 | dict_t *dict; | |
59533c16 | 2065 | int i; |
2fe58dfd | 2066 | |
b7886fd4 | 2067 | NEW(st); |
2fe58dfd SE |
2068 | |
2069 | st->cl.description="site"; | |
2070 | st->cl.type=CL_SITE; | |
2071 | st->cl.apply=NULL; | |
2072 | st->cl.interface=&st->ops; | |
2073 | st->ops.st=st; | |
2074 | st->ops.control=site_control; | |
2075 | st->ops.status=site_status; | |
2076 | ||
2077 | /* First parameter must be a dict */ | |
2078 | item=list_elem(args,0); | |
2079 | if (!item || item->type!=t_dict) | |
2080 | cfgfatal(loc,"site","parameter must be a dictionary\n"); | |
2081 | ||
2082 | dict=item->data.dict; | |
558fa3fb SE |
2083 | st->localname=dict_read_string(dict, "local-name", True, "site", loc); |
2084 | st->remotename=dict_read_string(dict, "name", True, "site", loc); | |
dba19f84 | 2085 | |
e6d6991c IJ |
2086 | st->keepalive=dict_read_bool(dict,"keepalive",False,"site",loc,False); |
2087 | ||
dba19f84 | 2088 | st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False); |
0391d9ee | 2089 | st->local_mobile= |
dba19f84 IJ |
2090 | dict_read_bool(dict,"local-mobile",False,"site",loc,False); |
2091 | ||
558fa3fb SE |
2092 | /* Sanity check (which also allows the 'sites' file to include |
2093 | site() closures for all sites including our own): refuse to | |
2094 | talk to ourselves */ | |
2095 | if (strcmp(st->localname,st->remotename)==0) { | |
b2a56f7c | 2096 | Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n", |
baa06aeb | 2097 | st->localname); |
0391d9ee | 2098 | if (st->peer_mobile != st->local_mobile) |
dba19f84 IJ |
2099 | cfgfatal(loc,"site","site %s's peer-mobile=%d" |
2100 | " but our local-mobile=%d\n", | |
0391d9ee | 2101 | st->localname, st->peer_mobile, st->local_mobile); |
dba19f84 IJ |
2102 | free(st); |
2103 | return NULL; | |
2104 | } | |
0391d9ee | 2105 | if (st->peer_mobile && st->local_mobile) { |
dba19f84 IJ |
2106 | Message(M_WARNING,"site %s: site is mobile but so are we" |
2107 | " -> ignoring this site\n", st->remotename); | |
558fa3fb SE |
2108 | free(st); |
2109 | return NULL; | |
2110 | } | |
dba19f84 | 2111 | |
58650a70 RK |
2112 | assert(index_sequence < 0xffffffffUL); |
2113 | st->index = ++index_sequence; | |
09a385fb | 2114 | st->local_capabilities = 0; |
469fd1d9 | 2115 | st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc); |
59533c16 | 2116 | |
5b5f297f IJ |
2117 | #define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \ |
2118 | list_t *things##_cfg=dict_lookup(dict,dictkey); \ | |
2119 | if (!things##_cfg) \ | |
2120 | cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \ | |
2121 | st->nthings=list_length(things##_cfg); \ | |
b4ececfc | 2122 | NEW_ARY(st->things,st->nthings); \ |
5b5f297f IJ |
2123 | assert(st->nthings); \ |
2124 | for (i=0; i<st->nthings; i++) { \ | |
2125 | item_t *item=list_elem(things##_cfg,i); \ | |
2126 | if (item->type!=t_closure) \ | |
2127 | cfgfatal(loc,"site","%s is not a closure\n",dictkey); \ | |
2128 | closure_t *cl=item->data.closure; \ | |
2129 | if (cl->type!=CL_TYPE) \ | |
2130 | cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \ | |
2131 | st->things[i]=cl->interface; \ | |
2132 | } \ | |
2133 | }while(0) | |
2134 | ||
2135 | GET_CLOSURE_LIST("comm",comms,ncomms,CL_COMM); | |
59533c16 | 2136 | |
5dfe538b IJ |
2137 | NEW_ARY(st->commclientinfos, st->ncomms); |
2138 | dict_t *comminfo = dict_read_dict(dict,"comm-info",False,"site",loc); | |
2139 | for (i=0; i<st->ncomms; i++) { | |
2140 | st->commclientinfos[i] = | |
2141 | !comminfo ? 0 : | |
2142 | st->comms[i]->clientinfo(st->comms[i],comminfo,loc); | |
2143 | } | |
2144 | ||
2fe58dfd SE |
2145 | st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc); |
2146 | st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc); | |
2147 | st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc); | |
2148 | ||
2fe58dfd | 2149 | st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc); |
83dbdd3f IJ |
2150 | st->addresses=dict_read_string_array(dict,"address",False,"site",loc,0); |
2151 | if (st->addresses) | |
3454dce4 SE |
2152 | st->remoteport=dict_read_number(dict,"port",True,"site",loc,0); |
2153 | else st->remoteport=0; | |
2fe58dfd SE |
2154 | st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc); |
2155 | ||
5b5f297f | 2156 | GET_CLOSURE_LIST("transform",transforms,ntransforms,CL_TRANSFORM); |
2fe58dfd SE |
2157 | |
2158 | st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc); | |
2159 | st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc); | |
2160 | ||
0391d9ee | 2161 | #define DEFAULT(D) (st->peer_mobile || st->local_mobile \ |
e57264d6 | 2162 | ? DEFAULT_MOBILE_##D : DEFAULT_##D) |
e7f8ec2a | 2163 | #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D)); |
c27ca22f | 2164 | |
e7f8ec2a IJ |
2165 | st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME); |
2166 | st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES); | |
2167 | st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL); | |
f7a86234 | 2168 | st->wait_timeout_mean= CFG_NUMBER("wait-time", WAIT_TIME); |
3ed1846a | 2169 | st->mtu_target= dict_read_number(dict,"mtu-target",False,"site",loc,0); |
e7f8ec2a | 2170 | |
446353cd IJ |
2171 | st->mobile_peer_expiry= dict_read_number( |
2172 | dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY); | |
2173 | ||
0f27325c IJ |
2174 | const char *peerskey= st->peer_mobile |
2175 | ? "mobile-peers-max" : "static-peers-max"; | |
2176 | st->transport_peers_max= dict_read_number( | |
83dbdd3f | 2177 | dict,peerskey,False,"site",loc, st->addresses ? 4 : 3); |
446353cd | 2178 | if (st->transport_peers_max<1 || |
0f27325c IJ |
2179 | st->transport_peers_max>MAX_PEER_ADDRS) { |
2180 | cfgfatal(loc,"site", "%s must be in range 1.." | |
2181 | STRING(MAX_PEER_ADDRS) "\n", peerskey); | |
446353cd IJ |
2182 | } |
2183 | ||
e7f8ec2a | 2184 | if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2) |
c27ca22f IJ |
2185 | st->key_renegotiate_time=st->key_lifetime/2; |
2186 | else | |
e7f8ec2a | 2187 | st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP); |
9d3a4132 | 2188 | st->key_renegotiate_time=dict_read_number( |
cce0051f | 2189 | dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time); |
9d3a4132 SE |
2190 | if (st->key_renegotiate_time > st->key_lifetime) { |
2191 | cfgfatal(loc,"site", | |
2192 | "renegotiate-time must be less than key-lifetime\n"); | |
2193 | } | |
9d3a4132 SE |
2194 | |
2195 | st->log_events=string_list_to_word(dict_lookup(dict,"log-events"), | |
2196 | log_event_table,"site"); | |
2fe58dfd | 2197 | |
83dbdd3f | 2198 | st->resolving_count=0; |
dd9209d1 IJ |
2199 | st->allow_send_prod=0; |
2200 | ||
4efd681a SE |
2201 | st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5, |
2202 | "site_apply"); | |
2203 | sprintf(st->tunname,"%s<->%s",st->localname,st->remotename); | |
2204 | ||
2fe58dfd | 2205 | /* The information we expect to see in incoming messages of type 1 */ |
59230b9b IJ |
2206 | /* fixme: lots of unchecked overflows here, but the results are only |
2207 | corrupted packets rather than undefined behaviour */ | |
ffafab08 | 2208 | st->our_name_later=(strcmp(st->localname,st->remotename)>0); |
2fe58dfd SE |
2209 | |
2210 | buffer_new(&st->buffer,SETUP_BUFFER_LEN); | |
2211 | ||
8aaaa634 | 2212 | buffer_new(&st->scratch,SETUP_BUFFER_LEN); |
05f39b4d IJ |
2213 | BUF_ALLOC(&st->scratch,"site:scratch"); |
2214 | ||
2fe58dfd SE |
2215 | /* We are interested in poll(), but only for timeouts. We don't have |
2216 | any fds of our own. */ | |
32fc582f | 2217 | register_for_poll(st, site_beforepoll, site_afterpoll, "site"); |
2fe58dfd SE |
2218 | st->timeout=0; |
2219 | ||
09a385fb | 2220 | st->remote_capabilities=0; |
5b5f297f | 2221 | st->chosen_transform=0; |
19e9a588 | 2222 | st->current.key_timeout=0; |
02b0959b | 2223 | st->auxiliary_key.key_timeout=0; |
446353cd IJ |
2224 | transport_peers_clear(st,&st->peers); |
2225 | transport_peers_clear(st,&st->setup_peers); | |
2fe58dfd SE |
2226 | /* XXX mlock these */ |
2227 | st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret"); | |
5b5f297f IJ |
2228 | st->sharedsecretlen=st->sharedsecretallocd=0; |
2229 | st->sharedsecret=0; | |
2230 | ||
5b5f297f IJ |
2231 | for (i=0; i<st->ntransforms; i++) { |
2232 | struct transform_if *ti=st->transforms[i]; | |
2233 | uint32_t capbit = 1UL << ti->capab_transformnum; | |
2234 | if (st->local_capabilities & capbit) | |
2235 | slog(st,LOG_ERROR,"transformnum capability bit" | |
2236 | " %d (%#"PRIx32") reused", ti->capab_transformnum, capbit); | |
2237 | st->local_capabilities |= capbit; | |
59533c16 | 2238 | } |
59533c16 | 2239 | |
b2de6bd2 IJ |
2240 | if (st->local_mobile || st->peer_mobile) |
2241 | st->local_capabilities |= CAPAB_PRIORITY_MOBILE; | |
2242 | ||
2fe58dfd | 2243 | /* We need to register the remote networks with the netlink device */ |
3ed1846a IJ |
2244 | uint32_t netlink_mtu; /* local virtual interface mtu */ |
2245 | st->netlink->reg(st->netlink->st, site_outgoing, st, &netlink_mtu); | |
2246 | if (!st->mtu_target) | |
2247 | st->mtu_target=netlink_mtu; | |
ff05a229 | 2248 | |
59533c16 IJ |
2249 | for (i=0; i<st->ncomms; i++) |
2250 | st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming); | |
2fe58dfd | 2251 | |
fcad4b0b IJ |
2252 | st->current.transform=0; |
2253 | st->auxiliary_key.transform=0; | |
2254 | st->new_transform=0; | |
bd98cd6b | 2255 | st->auxiliary_is_new=0; |
2fe58dfd SE |
2256 | |
2257 | enter_state_stop(st); | |
2258 | ||
794f2398 | 2259 | add_hook(PHASE_SHUTDOWN,site_phase_hook,st); |
32654a31 | 2260 | add_hook(PHASE_CHILDPERSIST,site_childpersist_clearkeys,st); |
794f2398 | 2261 | |
2fe58dfd SE |
2262 | return new_closure(&st->cl); |
2263 | } | |
2264 | ||
2fe58dfd SE |
2265 | void site_module(dict_t *dict) |
2266 | { | |
2267 | add_closure(dict,"site",site_apply); | |
2268 | } | |
446353cd IJ |
2269 | |
2270 | ||
2271 | /***** TRANSPORT PEERS definitions *****/ | |
2272 | ||
2273 | static void transport_peers_debug(struct site *st, transport_peers *dst, | |
2274 | const char *didwhat, | |
2275 | int nargs, const struct comm_addr *args, | |
2276 | size_t stride) { | |
2277 | int i; | |
2278 | char *argp; | |
2279 | ||
2280 | if (!(st->log_events & LOG_PEER_ADDRS)) | |
2281 | return; /* an optimisation */ | |
2282 | ||
2283 | slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d", | |
2284 | (dst==&st->peers ? "data" : | |
2285 | dst==&st->setup_peers ? "setup" : "UNKNOWN"), | |
2286 | didwhat, nargs, dst->npeers); | |
2287 | ||
2288 | for (i=0, argp=(void*)args; | |
2289 | i<nargs; | |
2290 | i++, (argp+=stride?stride:sizeof(*args))) { | |
2291 | const struct comm_addr *ca=(void*)argp; | |
2292 | slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s", | |
1a448682 | 2293 | i, comm_addr_to_string(ca)); |
446353cd IJ |
2294 | } |
2295 | for (i=0; i<dst->npeers; i++) { | |
2296 | struct timeval diff; | |
2297 | timersub(tv_now,&dst->peers[i].last,&diff); | |
2298 | const struct comm_addr *ca=&dst->peers[i].addr; | |
2299 | slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld", | |
1a448682 | 2300 | i, comm_addr_to_string(ca), |
446353cd IJ |
2301 | (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec); |
2302 | } | |
2303 | } | |
2304 | ||
446353cd IJ |
2305 | static void transport_peers_expire(struct site *st, transport_peers *peers) { |
2306 | /* peers must be sorted first */ | |
2307 | int previous_peers=peers->npeers; | |
2308 | struct timeval oldest; | |
2309 | oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry; | |
2310 | oldest.tv_usec = tv_now->tv_usec; | |
2311 | while (peers->npeers>1 && | |
2312 | timercmp(&peers->peers[peers->npeers-1].last, &oldest, <)) | |
2313 | peers->npeers--; | |
2314 | if (peers->npeers != previous_peers) | |
2315 | transport_peers_debug(st,peers,"expire", 0,0,0); | |
2316 | } | |
2317 | ||
51fc5a74 IJ |
2318 | static bool_t transport_peer_record_one(struct site *st, transport_peers *peers, |
2319 | const struct comm_addr *ca, | |
2320 | const struct timeval *tv) { | |
2321 | /* returns false if output is full */ | |
2322 | int search; | |
446353cd | 2323 | |
51fc5a74 IJ |
2324 | if (peers->npeers >= st->transport_peers_max) |
2325 | return 0; | |
446353cd | 2326 | |
51fc5a74 | 2327 | for (search=0; search<peers->npeers; search++) |
2093fb5c | 2328 | if (comm_addr_equal(&peers->peers[search].addr, ca)) |
51fc5a74 IJ |
2329 | return 1; |
2330 | ||
2331 | peers->peers[peers->npeers].addr = *ca; | |
2332 | peers->peers[peers->npeers].last = *tv; | |
2333 | peers->npeers++; | |
2334 | return 1; | |
2335 | } | |
2336 | ||
2337 | static void transport_record_peers(struct site *st, transport_peers *peers, | |
2338 | const struct comm_addr *addrs, int naddrs, | |
2339 | const char *m) { | |
2340 | /* We add addrs into peers. The new entries end up at the front | |
2341 | * and displace entries towards the end (perhaps even off the | |
2342 | * end). Any existing matching entries are moved up to the front. | |
2343 | * | |
2344 | * Caller must first call transport_peers_expire. */ | |
2345 | ||
fdef47ec IJ |
2346 | if (naddrs==1) { |
2347 | /* avoids debug for uninteresting updates */ | |
2348 | int i; | |
2349 | for (i=0; i<peers->npeers; i++) { | |
2350 | if (comm_addr_equal(&addrs[0], &peers->peers[i].addr)) { | |
2351 | memmove(peers->peers+1, peers->peers, | |
2352 | sizeof(peers->peers[0]) * i); | |
2353 | peers->peers[0].addr = addrs[0]; | |
2354 | peers->peers[0].last = *tv_now; | |
2355 | return; | |
2356 | } | |
2357 | } | |
51fc5a74 | 2358 | } |
446353cd | 2359 | |
51fc5a74 IJ |
2360 | int old_npeers=peers->npeers; |
2361 | transport_peer old_peers[old_npeers]; | |
2362 | COPY_ARRAY(old_peers,peers->peers,old_npeers); | |
446353cd | 2363 | |
51fc5a74 IJ |
2364 | peers->npeers=0; |
2365 | int i; | |
2366 | for (i=0; i<naddrs; i++) { | |
2367 | if (!transport_peer_record_one(st,peers, &addrs[i], tv_now)) | |
2368 | break; | |
2369 | } | |
2370 | for (i=0; i<old_npeers; i++) { | |
2371 | const transport_peer *old=&old_peers[i]; | |
2372 | if (!transport_peer_record_one(st,peers, &old->addr, &old->last)) | |
2373 | break; | |
2374 | } | |
446353cd | 2375 | |
51fc5a74 IJ |
2376 | transport_peers_debug(st,peers,m, naddrs,addrs,0); |
2377 | } | |
2378 | ||
2379 | static void transport_expire_record_peers(struct site *st, | |
2380 | transport_peers *peers, | |
2381 | const struct comm_addr *addrs, | |
2382 | int naddrs, const char *m) { | |
2383 | /* Convenience function */ | |
2384 | transport_peers_expire(st,peers); | |
2385 | transport_record_peers(st,peers,addrs,naddrs,m); | |
446353cd IJ |
2386 | } |
2387 | ||
2388 | static bool_t transport_compute_setupinit_peers(struct site *st, | |
45a14422 IJ |
2389 | const struct comm_addr *configured_addrs /* 0 if none or not found */, |
2390 | int n_configured_addrs /* 0 if none or not found */, | |
a96fda35 | 2391 | const struct comm_addr *incoming_packet_addr /* 0 if none */) { |
45a14422 | 2392 | if (!n_configured_addrs && !incoming_packet_addr && |
dd9209d1 | 2393 | !transport_peers_valid(&st->peers)) |
446353cd IJ |
2394 | return False; |
2395 | ||
2396 | slog(st,LOG_SETUP_INIT, | |
45a14422 IJ |
2397 | "using: %d configured addr(s);%s %d old peer addrs(es)", |
2398 | n_configured_addrs, | |
a96fda35 | 2399 | incoming_packet_addr ? " incoming packet address;" : "", |
779837e1 | 2400 | st->peers.npeers); |
446353cd | 2401 | |
0f27325c IJ |
2402 | /* Non-mobile peers try addresses until one is plausible. The |
2403 | * effect is that this code always tries first the configured | |
2404 | * address if supplied, or otherwise the address of the incoming | |
2405 | * PROD, or finally the existing data peer if one exists; this is | |
2406 | * as desired. */ | |
446353cd IJ |
2407 | |
2408 | transport_peers_copy(st,&st->setup_peers,&st->peers); | |
51fc5a74 | 2409 | transport_peers_expire(st,&st->setup_peers); |
446353cd | 2410 | |
a96fda35 | 2411 | if (incoming_packet_addr) |
51fc5a74 IJ |
2412 | transport_record_peers(st,&st->setup_peers, |
2413 | incoming_packet_addr,1, "incoming"); | |
dd9209d1 | 2414 | |
45a14422 | 2415 | if (n_configured_addrs) |
51fc5a74 | 2416 | transport_record_peers(st,&st->setup_peers, |
45a14422 | 2417 | configured_addrs,n_configured_addrs, "setupinit"); |
446353cd IJ |
2418 | |
2419 | assert(transport_peers_valid(&st->setup_peers)); | |
2420 | return True; | |
2421 | } | |
2422 | ||
2423 | static void transport_setup_msgok(struct site *st, const struct comm_addr *a) { | |
2424 | if (st->peer_mobile) | |
51fc5a74 | 2425 | transport_expire_record_peers(st,&st->setup_peers,a,1,"setupmsg"); |
446353cd IJ |
2426 | } |
2427 | static void transport_data_msgok(struct site *st, const struct comm_addr *a) { | |
2428 | if (st->peer_mobile) | |
51fc5a74 | 2429 | transport_expire_record_peers(st,&st->peers,a,1,"datamsg"); |
446353cd IJ |
2430 | } |
2431 | ||
2432 | static int transport_peers_valid(transport_peers *peers) { | |
2433 | return peers->npeers; | |
2434 | } | |
2435 | static void transport_peers_clear(struct site *st, transport_peers *peers) { | |
2436 | peers->npeers= 0; | |
2437 | transport_peers_debug(st,peers,"clear",0,0,0); | |
2438 | } | |
2439 | static void transport_peers_copy(struct site *st, transport_peers *dst, | |
2440 | const transport_peers *src) { | |
2441 | dst->npeers=src->npeers; | |
4f28e77e | 2442 | COPY_ARRAY(dst->peers, src->peers, dst->npeers); |
446353cd | 2443 | transport_peers_debug(st,dst,"copy", |
a620a048 | 2444 | src->npeers, &src->peers->addr, sizeof(*src->peers)); |
446353cd IJ |
2445 | } |
2446 | ||
90d7e3ad | 2447 | static void transport_resolve_complete(struct site *st, |
45a14422 IJ |
2448 | const struct comm_addr *addrs, |
2449 | int naddrs) { | |
2450 | transport_expire_record_peers(st,&st->peers,addrs,naddrs, | |
2451 | "resolved data"); | |
2452 | transport_expire_record_peers(st,&st->setup_peers,addrs,naddrs, | |
2453 | "resolved setup"); | |
90d7e3ad IJ |
2454 | } |
2455 | ||
2456 | static void transport_resolve_complete_tardy(struct site *st, | |
45a14422 IJ |
2457 | const struct comm_addr *addrs, |
2458 | int naddrs) { | |
2459 | transport_expire_record_peers(st,&st->peers,addrs,naddrs, | |
2460 | "resolved tardily"); | |
90d7e3ad IJ |
2461 | } |
2462 | ||
027a218f IJ |
2463 | static void transport_peers__copy_by_mask(transport_peer *out, int *nout_io, |
2464 | unsigned mask, | |
2465 | const transport_peers *inp) { | |
2466 | /* out and in->peers may be the same region, or nonoverlapping */ | |
2467 | const transport_peer *in=inp->peers; | |
2468 | int slot; | |
2469 | for (slot=0; slot<inp->npeers; slot++) { | |
2470 | if (!(mask & (1U << slot))) | |
2471 | continue; | |
2472 | if (!(out==in && slot==*nout_io)) | |
2473 | COPY_OBJ(out[*nout_io], in[slot]); | |
2474 | (*nout_io)++; | |
2475 | } | |
2476 | } | |
2477 | ||
446353cd IJ |
2478 | void transport_xmit(struct site *st, transport_peers *peers, |
2479 | struct buffer_if *buf, bool_t candebug) { | |
2480 | int slot; | |
2481 | transport_peers_expire(st, peers); | |
027a218f | 2482 | unsigned failed=0; /* bitmask */ |
0f27325c | 2483 | assert(MAX_PEER_ADDRS < sizeof(unsigned)*CHAR_BIT); |
027a218f IJ |
2484 | |
2485 | int nfailed=0; | |
446353cd IJ |
2486 | for (slot=0; slot<peers->npeers; slot++) { |
2487 | transport_peer *peer=&peers->peers[slot]; | |
eff48c12 | 2488 | bool_t ok = comm_addr_sendmsg(st, &peer->addr, buf); |
62846523 IJ |
2489 | if (candebug) |
2490 | dump_packet(st, buf, &peer->addr, False, ok); | |
027a218f IJ |
2491 | if (!ok) { |
2492 | failed |= 1U << slot; | |
2493 | nfailed++; | |
2494 | } | |
2495 | if (ok && !st->peer_mobile) | |
2496 | break; | |
2497 | } | |
2498 | /* Now we need to demote/delete failing addrs: if we are mobile we | |
2499 | * merely demote them; otherwise we delete them. */ | |
2500 | if (st->local_mobile) { | |
2501 | unsigned expected = ((1U << nfailed)-1) << (peers->npeers-nfailed); | |
2502 | /* `expected' has all the failures at the end already */ | |
2503 | if (failed != expected) { | |
2504 | int fslot=0; | |
2505 | transport_peer failedpeers[nfailed]; | |
2506 | transport_peers__copy_by_mask(failedpeers, &fslot, failed,peers); | |
2507 | assert(fslot == nfailed); | |
2508 | int wslot=0; | |
2509 | transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers); | |
2510 | assert(wslot+nfailed == peers->npeers); | |
2511 | COPY_ARRAY(peers->peers+wslot, failedpeers, nfailed); | |
92ae57c5 | 2512 | transport_peers_debug(st,peers,"mobile failure reorder",0,0,0); |
027a218f IJ |
2513 | } |
2514 | } else { | |
2515 | if (failed && peers->npeers > 1) { | |
2516 | int wslot=0; | |
2517 | transport_peers__copy_by_mask(peers->peers,&wslot,~failed,peers); | |
2518 | peers->npeers=wslot; | |
92ae57c5 | 2519 | transport_peers_debug(st,peers,"non-mobile failure cleanup",0,0,0); |
027a218f | 2520 | } |
446353cd IJ |
2521 | } |
2522 | } | |
2523 | ||
2524 | /***** END of transport peers declarations *****/ |