1 /* site.c - manage communication with a remote network site */
4 * This file is part of secnet.
5 * See README for full list of copyright holders.
7 * secnet is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
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.
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.
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). */
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. */
40 #include <sys/socket.h>
44 #include "unaligned.h"
47 #define SETUP_BUFFER_LEN 2048
49 #define DEFAULT_KEY_LIFETIME (3600*1000) /* [ms] */
50 #define DEFAULT_KEY_RENEGOTIATE_GAP (5*60*1000) /* [ms] */
51 #define DEFAULT_SETUP_RETRIES 5
52 #define DEFAULT_SETUP_RETRY_INTERVAL (2*1000) /* [ms] */
53 #define DEFAULT_WAIT_TIME (20*1000) /* [ms] */
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] */
61 #define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */
63 /* Each site can be in one of several possible 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
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
85 -> SITE_SENTMSG4 upon valid incoming message 3
86 -> SITE_WAIT on timeout
88 -> SITE_SENTMSG5 upon valid incoming message 4
89 -> SITE_WAIT on timeout
91 -> SITE_RUN upon valid incoming message 5
92 -> SITE_WAIT on timeout
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
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
110 int32_t site_max_start_pad
= 4*4;
112 static cstring_t
state_name(uint32_t state
)
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";
124 default: return "*bad state*";
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
135 #define LOG_SEC 0x00000020
136 #define LOG_STATE 0x00000040
137 #define LOG_DROP 0x00000080
138 #define LOG_DUMP 0x00000100
139 #define LOG_ERROR 0x00000400
140 #define LOG_PEER_ADDRS 0x00000800
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
},
153 { "peer-addrs", LOG_PEER_ADDRS
},
154 { "default", LOG_SETUP_INIT
|LOG_SETUP_TIMEOUT
|
155 LOG_ACTIVATE_KEY
|LOG_TIMEOUT_KEY
|LOG_SEC
|LOG_ERROR
},
156 { "all", 0xffffffff },
161 /***** TRANSPORT PEERS declarations *****/
163 /* Details of "mobile peer" semantics:
165 - We use the same data structure for the different configurations,
166 but manage it with different algorithms.
168 - We record up to mobile_peers_max peer address/port numbers
169 ("peers") for key setup, and separately up to mobile_peers_max
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.
176 If our peer is mobile:
178 - We send to all recent addresses of incoming packets, plus
179 initially all configured addresses (which we also expire).
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.
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.)
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.
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.)
200 - When we successfully complete a key setup, we merge the key setup
201 peers into the data transfer peers.
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.
207 If neither end is mobile:
209 - When peer initiated the key exchange, we use the incoming packet
212 - When we initiate the key exchange, we try configured addresses
213 until we get one which isn't unsupported then fixate on that.
215 - When we complete a key setup, we replace the data transport peers
216 with those from the key setup.
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.
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.)
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.
233 - When we complete a key setup, we replace the data transport peers
234 with those from the key setup.
240 struct comm_addr addr
;
244 /* configuration information */
245 /* runtime information */
247 transport_peer peers
[MAX_PEER_ADDRS
];
250 /* Basic operations on transport peer address sets */
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
);
256 /* Record address of incoming setup packet; resp. data packet. */
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
);
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. */
264 static bool_t
transport_compute_setupinit_peers(struct site
*st
,
265 const struct comm_addr
*configured_addrs
/* 0 if none or not found */,
266 int n_configured_addrs
/* 0 if none or not found */,
267 const struct comm_addr
*incoming_packet_addr
/* 0 if none */);
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
276 static void transport_resolve_complete(struct site
*st
,
277 const struct comm_addr
*addrs
, int naddrs
);
278 static void transport_resolve_complete_tardy(struct site
*st
,
279 const struct comm_addr
*addrs
, int naddrs
);
281 static void transport_xmit(struct site
*st
, transport_peers
*peers
,
282 struct buffer_if
*buf
, bool_t candebug
);
284 /***** END of transport peers declarations *****/
288 struct transform_inst_if
*transform
;
289 uint64_t key_timeout
; /* End of life of current key */
290 uint32_t remote_session_id
;
296 /* configuration information */
300 bool_t local_mobile
, peer_mobile
; /* Mobile client support */
301 int32_t transport_peers_max
;
302 string_t tunname
; /* localname<->remotename by default, used in logs */
303 cstring_t
*addresses
; /* DNS name or address(es) for bootstrapping, optional */
304 int remoteport
; /* Port for bootstrapping, optional */
306 struct netlink_if
*netlink
;
307 struct comm_if
**comms
;
308 struct comm_clientinfo
**commclientinfos
;
310 struct resolver_if
*resolver
;
312 struct random_if
*random
;
313 struct rsaprivkey_if
*privkey
;
314 struct rsapubkey_if
*pubkey
;
315 struct transform_if
**transforms
;
318 struct hash_if
*hash
;
320 uint32_t index
; /* Index of this site */
321 uint32_t local_capabilities
;
322 int32_t setup_retries
; /* How many times to send setup packets */
323 int32_t setup_retry_interval
; /* Initial timeout for setup packets */
324 int32_t wait_timeout
; /* How long to wait if setup unsuccessful */
325 int32_t mobile_peer_expiry
; /* How long to remember 2ary addresses */
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)
328 after this time, initiate a new
331 bool_t setup_priority
; /* Do we have precedence if both sites emit
332 message 1 simultaneously? */
335 /* runtime information */
337 uint64_t now
; /* Most recently seen time */
338 bool_t allow_send_prod
;
340 int resolving_n_results_all
;
341 int resolving_n_results_stored
;
342 struct comm_addr resolving_results
[MAX_PEER_ADDRS
];
344 /* The currently established session */
345 struct data_key current
;
346 struct data_key auxiliary_key
;
347 bool_t auxiliary_is_new
;
348 uint64_t renegotiate_key_time
; /* When we can negotiate a new key */
349 uint64_t auxiliary_renegotiate_key_time
;
350 transport_peers peers
; /* Current address(es) of peer for data traffic */
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. */
358 uint32_t remote_capabilities
;
359 uint16_t remote_adv_mtu
;
360 struct transform_if
*chosen_transform
;
361 uint32_t setup_session_id
;
362 transport_peers setup_peers
;
363 uint8_t localN
[NONCELEN
]; /* Nonces for key exchange */
364 uint8_t remoteN
[NONCELEN
];
365 struct buffer_if buffer
; /* Current outgoing key exchange packet */
366 struct buffer_if scratch
;
367 int32_t retries
; /* Number of retries remaining */
368 uint64_t timeout
; /* Timeout for current state */
370 uint8_t *sharedsecret
;
371 uint32_t sharedsecretlen
, sharedsecretallocd
;
372 struct transform_inst_if
*new_transform
; /* For key setup/verify */
375 static uint32_t event_log_priority(struct site
*st
, uint32_t event
)
377 if (!(event
&st
->log_events
))
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
;
395 static void vslog(struct site
*st
, uint32_t event
, cstring_t msg
, va_list ap
)
397 static void vslog(struct site
*st
, uint32_t event
, cstring_t msg
, va_list ap
)
401 class=event_log_priority(st
, event
);
403 slilog_part(st
->log
,class,"%s: ",st
->tunname
);
404 vslilog_part(st
->log
,class,msg
,ap
);
405 slilog_part(st
->log
,class,"\n");
409 static void slog(struct site
*st
, uint32_t event
, cstring_t msg
, ...)
411 static void slog(struct site
*st
, uint32_t event
, cstring_t msg
, ...)
415 vslog(st
,event
,msg
,ap
);
419 static void logtimeout(struct site
*st
, const char *fmt
, ...)
421 static void logtimeout(struct site
*st
, const char *fmt
, ...)
423 uint32_t class=event_log_priority(st
,LOG_SETUP_TIMEOUT
);
430 slilog_part(st
->log
,class,"%s: ",st
->tunname
);
431 vslilog_part(st
->log
,class,fmt
,ap
);
435 for (i
=0, delim
=" (tried ";
436 i
<st
->setup_peers
.npeers
;
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
);
443 slilog_part(st
->log
,class,")\n");
447 static void set_link_quality(struct site
*st
);
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 */);
453 static bool_t
initiate_key_setup(struct site
*st
, cstring_t reason
,
454 const struct comm_addr
*prod_hint
);
455 static void enter_state_run(struct site
*st
);
456 static bool_t
enter_state_resolve(struct site
*st
);
457 static void decrement_resolving_count(struct site
*st
, int by
);
458 static bool_t
enter_new_state(struct site
*st
,uint32_t next
);
459 static void enter_state_wait(struct site
*st
);
460 static void activate_new_key(struct site
*st
);
462 static bool_t
is_transform_valid(struct transform_inst_if
*transform
)
464 return transform
&& transform
->valid(transform
->st
);
467 static bool_t
current_valid(struct site
*st
)
469 return is_transform_valid(st
->current
.transform
);
472 #define DEFINE_CALL_TRANSFORM(fwdrev) \
473 static int call_transform_##fwdrev(struct site *st, \
474 struct transform_inst_if *transform, \
475 struct buffer_if *buf, \
476 const char **errmsg) \
478 if (!is_transform_valid(transform)) { \
479 *errmsg="transform not set up"; \
482 return transform->fwdrev(transform->st,buf,errmsg); \
485 DEFINE_CALL_TRANSFORM(forwards
)
486 DEFINE_CALL_TRANSFORM(reverse
)
488 static void dispose_transform(struct transform_inst_if
**transform_var
)
490 struct transform_inst_if
*transform
=*transform_var
;
492 transform
->delkey(transform
->st
);
493 transform
->destroy(transform
->st
);
498 #define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
499 #define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
500 #define CHECK_TYPE(b,t) do { uint32_t type; \
501 CHECK_AVAIL((b),4); \
502 type=buf_unprepend_uint32((b)); \
503 if (type!=(t)) return False; } while(0)
505 static _Bool
type_is_msg34(uint32_t type
)
508 type
== LABEL_MSG3
||
509 type
== LABEL_MSG3BIS
||
516 struct buffer_if extrainfo
;
523 struct parsedname remote
;
524 struct parsedname local
;
525 uint32_t remote_capabilities
;
527 int capab_transformnum
;
537 static _Bool
set_new_transform(struct site
*st
, char *pk
)
541 /* Make room for the shared key */
542 st
->sharedsecretlen
=st
->chosen_transform
->keylen?
:st
->dh
->ceil_len
;
543 assert(st
->sharedsecretlen
);
544 if (st
->sharedsecretlen
> st
->sharedsecretallocd
) {
545 st
->sharedsecretallocd
=st
->sharedsecretlen
;
546 st
->sharedsecret
=safe_realloc_ary(st
->sharedsecret
,1,
547 st
->sharedsecretallocd
,
548 "site:sharedsecret");
551 /* Generate the shared key */
552 st
->dh
->makeshared(st
->dh
->st
,st
->dhsecret
,st
->dh
->len
,pk
,
553 st
->sharedsecret
,st
->sharedsecretlen
);
555 /* Set up the transform */
556 struct transform_if
*generator
=st
->chosen_transform
;
557 struct transform_inst_if
*generated
=generator
->create(generator
->st
);
558 ok
= generated
->setkey(generated
->st
,st
->sharedsecret
,
559 st
->sharedsecretlen
,st
->setup_priority
);
561 dispose_transform(&st
->new_transform
);
562 if (!ok
) return False
;
563 st
->new_transform
=generated
;
565 slog(st
,LOG_SETUP_INIT
,"key exchange negotiated transform"
566 " %d (capabilities ours=%#"PRIx32
" theirs=%#"PRIx32
")",
567 st
->chosen_transform
->capab_transformnum
,
568 st
->local_capabilities
, st
->remote_capabilities
);
573 int32_t lenpos
, afternul
;
575 static void append_string_xinfo_start(struct buffer_if
*buf
,
576 struct xinfoadd
*xia
,
578 /* Helps construct one of the names with additional info as found
579 * in MSG1..4. Call this function first, then append all the
580 * desired extra info (not including the nul byte) to the buffer,
581 * then call append_string_xinfo_done. */
583 xia
->lenpos
= buf
->size
;
584 buf_append_string(buf
,str
);
585 buf_append_uint8(buf
,0);
586 xia
->afternul
= buf
->size
;
588 static void append_string_xinfo_done(struct buffer_if
*buf
,
589 struct xinfoadd
*xia
)
591 /* we just need to adjust the string length */
592 if (buf
->size
== xia
->afternul
) {
593 /* no extra info, strip the nul too */
594 buf_unappend_uint8(buf
);
596 put_uint16(buf
->start
+xia
->lenpos
, buf
->size
-(xia
->lenpos
+2));
600 /* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
601 out using a transform of config data supplied by netlink */
602 static bool_t
generate_msg(struct site
*st
, uint32_t type
, cstring_t what
)
608 st
->retries
=st
->setup_retries
;
609 BUF_ALLOC(&st
->buffer
,what
);
610 buffer_init(&st
->buffer
,0);
611 buf_append_uint32(&st
->buffer
,
612 (type
==LABEL_MSG1?
0:st
->setup_session_id
));
613 buf_append_uint32(&st
->buffer
,st
->index
);
614 buf_append_uint32(&st
->buffer
,type
);
617 append_string_xinfo_start(&st
->buffer
,&xia
,st
->localname
);
618 if ((st
->local_capabilities
& CAPAB_EARLY
) || (type
!= LABEL_MSG1
)) {
619 buf_append_uint32(&st
->buffer
,st
->local_capabilities
);
621 if (type_is_msg34(type
)) {
622 buf_append_uint16(&st
->buffer
,st
->mtu_target
);
624 append_string_xinfo_done(&st
->buffer
,&xia
);
626 buf_append_string(&st
->buffer
,st
->remotename
);
627 BUF_ADD_OBJ(append
,&st
->buffer
,st
->localN
);
628 if (type
==LABEL_MSG1
) return True
;
629 BUF_ADD_OBJ(append
,&st
->buffer
,st
->remoteN
);
630 if (type
==LABEL_MSG2
) return True
;
632 if (hacky_par_mid_failnow()) return False
;
634 if (type
==LABEL_MSG3BIS
)
635 buf_append_uint8(&st
->buffer
,st
->chosen_transform
->capab_transformnum
);
637 dhpub
=st
->dh
->makepublic(st
->dh
->st
,st
->dhsecret
,st
->dh
->len
);
638 buf_append_string(&st
->buffer
,dhpub
);
640 hash
=safe_malloc(st
->hash
->len
, "generate_msg");
641 hst
=st
->hash
->init();
642 st
->hash
->update(hst
,st
->buffer
.start
,st
->buffer
.size
);
643 st
->hash
->final(hst
,hash
);
644 sig
=st
->privkey
->sign(st
->privkey
->st
,hash
,st
->hash
->len
);
645 buf_append_string(&st
->buffer
,sig
);
651 static bool_t
unpick_name(struct buffer_if
*msg
, struct parsedname
*nm
)
654 nm
->len
=buf_unprepend_uint16(msg
);
655 CHECK_AVAIL(msg
,nm
->len
);
656 nm
->name
=buf_unprepend(msg
,nm
->len
);
657 uint8_t *nul
=memchr(nm
->name
,0,nm
->len
);
659 buffer_readonly_view(&nm
->extrainfo
,0,0);
661 buffer_readonly_view(&nm
->extrainfo
, nul
+1, msg
->start
-(nul
+1));
662 nm
->len
=nul
-nm
->name
;
667 static bool_t
unpick_msg(struct site
*st
, uint32_t type
,
668 struct buffer_if
*msg
, struct msg
*m
)
670 m
->capab_transformnum
=-1;
671 m
->hashstart
=msg
->start
;
673 m
->dest
=buf_unprepend_uint32(msg
);
675 m
->source
=buf_unprepend_uint32(msg
);
676 CHECK_TYPE(msg
,type
);
677 if (!unpick_name(msg
,&m
->remote
)) return False
;
678 m
->remote_capabilities
=0;
680 if (m
->remote
.extrainfo
.size
) {
681 CHECK_AVAIL(&m
->remote
.extrainfo
,4);
682 m
->remote_capabilities
=buf_unprepend_uint32(&m
->remote
.extrainfo
);
684 if (type_is_msg34(type
) && m
->remote
.extrainfo
.size
) {
685 CHECK_AVAIL(&m
->remote
.extrainfo
,2);
686 m
->remote_mtu
=buf_unprepend_uint16(&m
->remote
.extrainfo
);
688 if (!unpick_name(msg
,&m
->local
)) return False
;
689 if (type
==LABEL_PROD
) {
693 CHECK_AVAIL(msg
,NONCELEN
);
694 m
->nR
=buf_unprepend(msg
,NONCELEN
);
695 if (type
==LABEL_MSG1
) {
699 CHECK_AVAIL(msg
,NONCELEN
);
700 m
->nL
=buf_unprepend(msg
,NONCELEN
);
701 if (type
==LABEL_MSG2
) {
705 if (type
==LABEL_MSG3BIS
) {
707 m
->capab_transformnum
= buf_unprepend_uint8(msg
);
709 m
->capab_transformnum
= CAPAB_TRANSFORMNUM_ANCIENT
;
712 m
->pklen
=buf_unprepend_uint16(msg
);
713 CHECK_AVAIL(msg
,m
->pklen
);
714 m
->pk
=buf_unprepend(msg
,m
->pklen
);
715 m
->hashlen
=msg
->start
-m
->hashstart
;
717 m
->siglen
=buf_unprepend_uint16(msg
);
718 CHECK_AVAIL(msg
,m
->siglen
);
719 m
->sig
=buf_unprepend(msg
,m
->siglen
);
722 /* In `process_msg3_msg4' below, we assume that we can write a nul
723 * terminator following the signature. Make sure there's enough space.
725 if (msg
->start
>= msg
->base
+ msg
->alloclen
)
731 static bool_t
name_matches(const struct parsedname
*nm
, const char *expected
)
733 int expected_len
=strlen(expected
);
735 nm
->len
== expected_len
&&
736 !memcmp(nm
->name
, expected
, expected_len
);
739 static bool_t
check_msg(struct site
*st
, uint32_t type
, struct msg
*m
,
742 if (type
==LABEL_MSG1
) return True
;
744 /* Check that the site names and our nonce have been sent
745 back correctly, and then store our peer's nonce. */
746 if (!name_matches(&m
->remote
,st
->remotename
)) {
747 *error
="wrong remote site name";
750 if (!name_matches(&m
->local
,st
->localname
)) {
751 *error
="wrong local site name";
754 if (memcmp(m
->nL
,st
->localN
,NONCELEN
)!=0) {
755 *error
="wrong locally-generated nonce";
758 if (type
==LABEL_MSG2
) return True
;
759 if (!consttime_memeq(m
->nR
,st
->remoteN
,NONCELEN
)!=0) {
760 *error
="wrong remotely-generated nonce";
763 /* MSG3 has complicated rules about capabilities, which are
764 * handled in process_msg3. */
765 if (type
==LABEL_MSG3
|| type
==LABEL_MSG3BIS
) return True
;
766 if (m
->remote_capabilities
!=st
->remote_capabilities
) {
767 *error
="remote capabilities changed";
770 if (type
==LABEL_MSG4
) return True
;
771 *error
="unknown message type";
775 static bool_t
generate_msg1(struct site
*st
)
777 st
->random
->generate(st
->random
->st
,NONCELEN
,st
->localN
);
778 return generate_msg(st
,LABEL_MSG1
,"site:MSG1");
781 static bool_t
process_msg1(struct site
*st
, struct buffer_if
*msg1
,
782 const struct comm_addr
*src
, struct msg
*m
)
784 /* We've already determined we're in an appropriate state to
785 process an incoming MSG1, and that the MSG1 has correct values
788 st
->setup_session_id
=m
->source
;
789 st
->remote_capabilities
=m
->remote_capabilities
;
790 memcpy(st
->remoteN
,m
->nR
,NONCELEN
);
794 static bool_t
generate_msg2(struct site
*st
)
796 st
->random
->generate(st
->random
->st
,NONCELEN
,st
->localN
);
797 return generate_msg(st
,LABEL_MSG2
,"site:MSG2");
800 static bool_t
process_msg2(struct site
*st
, struct buffer_if
*msg2
,
801 const struct comm_addr
*src
)
806 if (!unpick_msg(st
,LABEL_MSG2
,msg2
,&m
)) return False
;
807 if (!check_msg(st
,LABEL_MSG2
,&m
,&err
)) {
808 slog(st
,LOG_SEC
,"msg2: %s",err
);
811 st
->setup_session_id
=m
.source
;
812 st
->remote_capabilities
=m
.remote_capabilities
;
814 /* Select the transform to use */
816 uint32_t remote_transforms
= st
->remote_capabilities
& CAPAB_TRANSFORM_MASK
;
817 if (!remote_transforms
)
818 /* old secnets only had this one transform */
819 remote_transforms
= 1UL << CAPAB_TRANSFORMNUM_ANCIENT
;
821 struct transform_if
*ti
;
823 for (i
=0; i
<st
->ntransforms
; i
++) {
824 ti
=st
->transforms
[i
];
825 if ((1UL << ti
->capab_transformnum
) & remote_transforms
)
826 goto transform_found
;
828 slog(st
,LOG_ERROR
,"no transforms in common"
829 " (us %#"PRIx32
"; them: %#"PRIx32
")",
830 st
->local_capabilities
& CAPAB_TRANSFORM_MASK
,
834 st
->chosen_transform
=ti
;
836 memcpy(st
->remoteN
,m
.nR
,NONCELEN
);
840 static bool_t
generate_msg3(struct site
*st
)
842 /* Now we have our nonce and their nonce. Think of a secret key,
843 and create message number 3. */
844 st
->random
->generate(st
->random
->st
,st
->dh
->len
,st
->dhsecret
);
845 return generate_msg(st
,
846 (st
->remote_capabilities
& CAPAB_TRANSFORM_MASK
847 ? LABEL_MSG3BIS
: LABEL_MSG3
),
851 static bool_t
process_msg3_msg4(struct site
*st
, struct msg
*m
)
856 /* Check signature and store g^x mod m */
857 hash
=safe_malloc(st
->hash
->len
, "process_msg3_msg4");
858 hst
=st
->hash
->init();
859 st
->hash
->update(hst
,m
->hashstart
,m
->hashlen
);
860 st
->hash
->final(hst
,hash
);
861 /* Terminate signature with a '0' - already checked that this will fit */
863 if (!st
->pubkey
->check(st
->pubkey
->st
,hash
,st
->hash
->len
,m
->sig
)) {
864 slog(st
,LOG_SEC
,"msg3/msg4 signature failed check!");
870 st
->remote_adv_mtu
=m
->remote_mtu
;
875 static bool_t
process_msg3(struct site
*st
, struct buffer_if
*msg3
,
876 const struct comm_addr
*src
, uint32_t msgtype
)
881 assert(msgtype
==LABEL_MSG3
|| msgtype
==LABEL_MSG3BIS
);
883 if (!unpick_msg(st
,msgtype
,msg3
,&m
)) return False
;
884 if (!check_msg(st
,msgtype
,&m
,&err
)) {
885 slog(st
,LOG_SEC
,"msg3: %s",err
);
888 uint32_t capab_adv_late
= m
.remote_capabilities
889 & ~st
->remote_capabilities
& CAPAB_EARLY
;
890 if (capab_adv_late
) {
891 slog(st
,LOG_SEC
,"msg3 impermissibly adds early capability flag(s)"
892 " %#"PRIx32
" (was %#"PRIx32
", now %#"PRIx32
")",
893 capab_adv_late
, st
->remote_capabilities
, m
.remote_capabilities
);
896 st
->remote_capabilities
|=m
.remote_capabilities
;
898 struct transform_if
*ti
;
900 for (i
=0; i
<st
->ntransforms
; i
++) {
901 ti
=st
->transforms
[i
];
902 if (ti
->capab_transformnum
== m
.capab_transformnum
)
903 goto transform_found
;
905 slog(st
,LOG_SEC
,"peer chose unknown-to-us transform %d!",
906 m
.capab_transformnum
);
909 st
->chosen_transform
=ti
;
911 if (!process_msg3_msg4(st
,&m
))
914 /* Terminate their DH public key with a '0' */
916 /* Invent our DH secret key */
917 st
->random
->generate(st
->random
->st
,st
->dh
->len
,st
->dhsecret
);
919 /* Generate the shared key and set up the transform */
920 if (!set_new_transform(st
,m
.pk
)) return False
;
925 static bool_t
generate_msg4(struct site
*st
)
927 /* We have both nonces, their public key and our private key. Generate
928 our public key, sign it and send it to them. */
929 return generate_msg(st
,LABEL_MSG4
,"site:MSG4");
932 static bool_t
process_msg4(struct site
*st
, struct buffer_if
*msg4
,
933 const struct comm_addr
*src
)
938 if (!unpick_msg(st
,LABEL_MSG4
,msg4
,&m
)) return False
;
939 if (!check_msg(st
,LABEL_MSG4
,&m
,&err
)) {
940 slog(st
,LOG_SEC
,"msg4: %s",err
);
944 if (!process_msg3_msg4(st
,&m
))
947 /* Terminate their DH public key with a '0' */
950 /* Generate the shared key and set up the transform */
951 if (!set_new_transform(st
,m
.pk
)) return False
;
962 static bool_t
unpick_msg0(struct site
*st
, struct buffer_if
*msg0
,
966 m
->dest
=buf_unprepend_uint32(msg0
);
968 m
->source
=buf_unprepend_uint32(msg0
);
970 m
->type
=buf_unprepend_uint32(msg0
);
972 /* Leaves transformed part of buffer untouched */
975 static bool_t
generate_msg5(struct site
*st
)
977 cstring_t transform_err
;
979 BUF_ALLOC(&st
->buffer
,"site:MSG5");
980 /* We are going to add four words to the message */
981 buffer_init(&st
->buffer
,calculate_max_start_pad());
982 /* Give the netlink code an opportunity to put its own stuff in the
983 message (configuration information, etc.) */
984 buf_prepend_uint32(&st
->buffer
,LABEL_MSG5
);
985 if (call_transform_forwards(st
,st
->new_transform
,
986 &st
->buffer
,&transform_err
))
988 buf_prepend_uint32(&st
->buffer
,LABEL_MSG5
);
989 buf_prepend_uint32(&st
->buffer
,st
->index
);
990 buf_prepend_uint32(&st
->buffer
,st
->setup_session_id
);
992 st
->retries
=st
->setup_retries
;
996 static bool_t
process_msg5(struct site
*st
, struct buffer_if
*msg5
,
997 const struct comm_addr
*src
,
998 struct transform_inst_if
*transform
)
1001 cstring_t transform_err
;
1003 if (!unpick_msg0(st
,msg5
,&m
)) return False
;
1005 if (call_transform_reverse(st
,transform
,msg5
,&transform_err
)) {
1006 /* There's a problem */
1007 slog(st
,LOG_SEC
,"process_msg5: transform: %s",transform_err
);
1010 /* Buffer should now contain untransformed PING packet data */
1011 CHECK_AVAIL(msg5
,4);
1012 if (buf_unprepend_uint32(msg5
)!=LABEL_MSG5
) {
1013 slog(st
,LOG_SEC
,"MSG5/PING packet contained wrong label");
1016 /* Older versions of secnet used to write some config data here
1017 * which we ignore. So we don't CHECK_EMPTY */
1021 static void create_msg6(struct site
*st
, struct transform_inst_if
*transform
,
1022 uint32_t session_id
)
1024 cstring_t transform_err
;
1026 BUF_ALLOC(&st
->buffer
,"site:MSG6");
1027 /* We are going to add four words to the message */
1028 buffer_init(&st
->buffer
,calculate_max_start_pad());
1029 /* Give the netlink code an opportunity to put its own stuff in the
1030 message (configuration information, etc.) */
1031 buf_prepend_uint32(&st
->buffer
,LABEL_MSG6
);
1032 int problem
= call_transform_forwards(st
,transform
,
1033 &st
->buffer
,&transform_err
);
1035 buf_prepend_uint32(&st
->buffer
,LABEL_MSG6
);
1036 buf_prepend_uint32(&st
->buffer
,st
->index
);
1037 buf_prepend_uint32(&st
->buffer
,session_id
);
1040 static bool_t
generate_msg6(struct site
*st
)
1042 if (!is_transform_valid(st
->new_transform
))
1044 create_msg6(st
,st
->new_transform
,st
->setup_session_id
);
1045 st
->retries
=1; /* Peer will retransmit MSG5 if this packet gets lost */
1049 static bool_t
process_msg6(struct site
*st
, struct buffer_if
*msg6
,
1050 const struct comm_addr
*src
)
1053 cstring_t transform_err
;
1055 if (!unpick_msg0(st
,msg6
,&m
)) return False
;
1057 if (call_transform_reverse(st
,st
->new_transform
,msg6
,&transform_err
)) {
1058 /* There's a problem */
1059 slog(st
,LOG_SEC
,"process_msg6: transform: %s",transform_err
);
1062 /* Buffer should now contain untransformed PING packet data */
1063 CHECK_AVAIL(msg6
,4);
1064 if (buf_unprepend_uint32(msg6
)!=LABEL_MSG6
) {
1065 slog(st
,LOG_SEC
,"MSG6/PONG packet contained invalid data");
1068 /* Older versions of secnet used to write some config data here
1069 * which we ignore. So we don't CHECK_EMPTY */
1073 static bool_t
decrypt_msg0(struct site
*st
, struct buffer_if
*msg0
,
1074 const struct comm_addr
*src
)
1076 cstring_t transform_err
, auxkey_err
, newkey_err
="n/a";
1080 if (!unpick_msg0(st
,msg0
,&m
)) return False
;
1082 /* Keep a copy so we can try decrypting it with multiple keys */
1083 buffer_copy(&st
->scratch
, msg0
);
1085 problem
= call_transform_reverse(st
,st
->current
.transform
,
1086 msg0
,&transform_err
);
1088 if (!st
->auxiliary_is_new
)
1089 delete_one_key(st
,&st
->auxiliary_key
,
1090 "peer has used new key","auxiliary key",LOG_SEC
);
1096 buffer_copy(msg0
, &st
->scratch
);
1097 problem
= call_transform_reverse(st
,st
->auxiliary_key
.transform
,
1100 slog(st
,LOG_DROP
,"processing packet which uses auxiliary key");
1101 if (st
->auxiliary_is_new
) {
1102 /* We previously timed out in state SENTMSG5 but it turns
1103 * out that our peer did in fact get our MSG5 and is
1104 * using the new key. So we should switch to it too. */
1105 /* This is a bit like activate_new_key. */
1108 st
->current
=st
->auxiliary_key
;
1109 st
->auxiliary_key
=t
;
1111 delete_one_key(st
,&st
->auxiliary_key
,"peer has used new key",
1112 "previous key",LOG_SEC
);
1113 st
->auxiliary_is_new
=0;
1114 st
->renegotiate_key_time
=st
->auxiliary_renegotiate_key_time
;
1121 if (st
->state
==SITE_SENTMSG5
) {
1122 buffer_copy(msg0
, &st
->scratch
);
1123 problem
= call_transform_reverse(st
,st
->new_transform
,
1126 /* It looks like we didn't get the peer's MSG6 */
1127 /* This is like a cut-down enter_new_state(SITE_RUN) */
1128 slog(st
,LOG_STATE
,"will enter state RUN (MSG0 with new key)");
1129 BUF_FREE(&st
->buffer
);
1131 activate_new_key(st
);
1132 return True
; /* do process the data in this packet */
1138 slog(st
,LOG_SEC
,"transform: %s (aux: %s, new: %s)",
1139 transform_err
,auxkey_err
,newkey_err
);
1140 initiate_key_setup(st
,"incoming message would not decrypt",0);
1141 send_nak(src
,m
.dest
,m
.source
,m
.type
,msg0
,"message would not decrypt");
1145 slog(st
,LOG_DROP
,"transform: %s (merely skew)",transform_err
);
1150 static bool_t
process_msg0(struct site
*st
, struct buffer_if
*msg0
,
1151 const struct comm_addr
*src
)
1155 if (!decrypt_msg0(st
,msg0
,src
))
1158 CHECK_AVAIL(msg0
,4);
1159 type
=buf_unprepend_uint32(msg0
);
1162 /* We must forget about the current session. */
1163 delete_keys(st
,"request from peer",LOG_SEC
);
1164 /* probably, the peer is shutting down, and this is going to fail,
1165 * but we need to be trying to bring the link up again */
1167 initiate_key_setup(st
,"peer requested key teardown",0);
1170 /* Deliver to netlink layer */
1171 st
->netlink
->deliver(st
->netlink
->st
,msg0
);
1172 transport_data_msgok(st
,src
);
1173 /* See whether we should start negotiating a new key */
1174 if (st
->now
> st
->renegotiate_key_time
)
1175 initiate_key_setup(st
,"incoming packet in renegotiation window",0);
1178 slog(st
,LOG_SEC
,"incoming encrypted message of type %08x "
1185 static void dump_packet(struct site
*st
, struct buffer_if
*buf
,
1186 const struct comm_addr
*addr
, bool_t incoming
,
1189 uint32_t dest
=get_uint32(buf
->start
);
1190 uint32_t source
=get_uint32(buf
->start
+4);
1191 uint32_t msgtype
=get_uint32(buf
->start
+8);
1193 if (st
->log_events
& LOG_DUMP
)
1194 slilog(st
->log
,M_DEBUG
,"%s: %s: %08x<-%08x: %08x: %s%s",
1195 st
->tunname
,incoming?
"incoming":"outgoing",
1196 dest
,source
,msgtype
,comm_addr_to_string(addr
),
1200 static bool_t
comm_addr_sendmsg(struct site
*st
,
1201 const struct comm_addr
*dest
,
1202 struct buffer_if
*buf
)
1205 struct comm_clientinfo
*commclientinfo
= 0;
1207 for (i
=0; i
< st
->ncomms
; i
++) {
1208 if (st
->comms
[i
] == dest
->comm
) {
1209 commclientinfo
= st
->commclientinfos
[i
];
1213 return dest
->comm
->sendmsg(dest
->comm
->st
, buf
, dest
, commclientinfo
);
1216 static uint32_t site_status(void *st
)
1221 static bool_t
send_msg(struct site
*st
)
1223 if (st
->retries
>0) {
1224 transport_xmit(st
, &st
->setup_peers
, &st
->buffer
, True
);
1225 st
->timeout
=st
->now
+st
->setup_retry_interval
;
1228 } else if (st
->state
==SITE_SENTMSG5
) {
1229 logtimeout(st
,"timed out sending MSG5, stashing new key");
1230 /* We stash the key we have produced, in case it turns out that
1231 * our peer did see our MSG5 after all and starts using it. */
1232 /* This is a bit like some of activate_new_key */
1233 struct transform_inst_if
*t
;
1234 t
=st
->auxiliary_key
.transform
;
1235 st
->auxiliary_key
.transform
=st
->new_transform
;
1236 st
->new_transform
=t
;
1237 dispose_transform(&st
->new_transform
);
1239 st
->auxiliary_is_new
=1;
1240 st
->auxiliary_key
.key_timeout
=st
->now
+st
->key_lifetime
;
1241 st
->auxiliary_renegotiate_key_time
=st
->now
+st
->key_renegotiate_time
;
1242 st
->auxiliary_key
.remote_session_id
=st
->setup_session_id
;
1244 enter_state_wait(st
);
1247 logtimeout(st
,"timed out sending key setup packet "
1248 "(in state %s)",state_name(st
->state
));
1249 enter_state_wait(st
);
1254 static void site_resolve_callback(void *sst
, const struct comm_addr
*addrs
,
1255 int stored_naddrs
, int all_naddrs
,
1256 const char *address
, const char *failwhy
)
1258 struct site
*st
=sst
;
1260 if (!stored_naddrs
) {
1261 slog(st
,LOG_ERROR
,"resolution of %s failed: %s",address
,failwhy
);
1263 slog(st
,LOG_PEER_ADDRS
,"resolution of %s completed, %d addrs, eg: %s",
1264 address
, all_naddrs
, comm_addr_to_string(&addrs
[0]));;
1266 int space
=st
->transport_peers_max
-st
->resolving_n_results_stored
;
1267 int n_tocopy
=MIN(stored_naddrs
,space
);
1268 COPY_ARRAY(st
->resolving_results
+ st
->resolving_n_results_stored
,
1271 st
->resolving_n_results_stored
+= n_tocopy
;
1272 st
->resolving_n_results_all
+= all_naddrs
;
1275 decrement_resolving_count(st
,1);
1278 static void decrement_resolving_count(struct site
*st
, int by
)
1280 assert(st
->resolving_count
>0);
1281 st
->resolving_count
-=by
;
1283 if (st
->resolving_count
)
1286 /* OK, we are done with them all. Handle combined results. */
1288 const struct comm_addr
*addrs
=st
->resolving_results
;
1289 int naddrs
=st
->resolving_n_results_stored
;
1290 assert(naddrs
<=st
->transport_peers_max
);
1293 if (naddrs
!= st
->resolving_n_results_all
) {
1294 slog(st
,LOG_SETUP_INIT
,"resolution of supplied addresses/names"
1295 " yielded too many results (%d > %d), some ignored",
1296 st
->resolving_n_results_all
, naddrs
);
1298 slog(st
,LOG_STATE
,"resolution completed, %d addrs, eg: %s",
1299 naddrs
, iaddr_to_string(&addrs
[0].ia
));;
1302 switch (st
->state
) {
1304 if (transport_compute_setupinit_peers(st
,addrs
,naddrs
,0)) {
1305 enter_new_state(st
,SITE_SENTMSG1
);
1307 /* Can't figure out who to try to to talk to */
1308 slog(st
,LOG_SETUP_INIT
,
1309 "key exchange failed: cannot find peer address");
1310 enter_state_run(st
);
1313 case SITE_SENTMSG1
: case SITE_SENTMSG2
:
1314 case SITE_SENTMSG3
: case SITE_SENTMSG4
:
1317 /* We start using the address immediately for data too.
1318 * It's best to store it in st->peers now because we might
1319 * go via SENTMSG5, WAIT, and a MSG0, straight into using
1320 * the new key (without updating the data peer addrs). */
1321 transport_resolve_complete(st
,addrs
,naddrs
);
1322 } else if (st
->local_mobile
) {
1323 /* We can't let this rest because we may have a peer
1324 * address which will break in the future. */
1325 slog(st
,LOG_SETUP_INIT
,"resolution failed: "
1326 "abandoning key exchange");
1327 enter_state_wait(st
);
1329 slog(st
,LOG_SETUP_INIT
,"resolution failed: "
1330 " continuing to use source address of peer's packets"
1331 " for key exchange and ultimately data");
1336 slog(st
,LOG_SETUP_INIT
,"resolution completed tardily,"
1337 " updating peer address(es)");
1338 transport_resolve_complete_tardy(st
,addrs
,naddrs
);
1339 } else if (st
->local_mobile
) {
1340 /* Not very good. We should queue (another) renegotiation
1341 * so that we can update the peer address. */
1342 st
->key_renegotiate_time
=st
->now
+st
->wait_timeout
;
1344 slog(st
,LOG_SETUP_INIT
,"resolution failed: "
1345 " continuing to use source address of peer's packets");
1355 static bool_t
initiate_key_setup(struct site
*st
, cstring_t reason
,
1356 const struct comm_addr
*prod_hint
)
1358 /* Reentrancy hazard: can call enter_new_state/enter_state_* */
1359 if (st
->state
!=SITE_RUN
) return False
;
1360 slog(st
,LOG_SETUP_INIT
,"initiating key exchange (%s)",reason
);
1361 if (st
->addresses
) {
1362 slog(st
,LOG_SETUP_INIT
,"resolving peer address(es)");
1363 return enter_state_resolve(st
);
1364 } else if (transport_compute_setupinit_peers(st
,0,0,prod_hint
)) {
1365 return enter_new_state(st
,SITE_SENTMSG1
);
1367 slog(st
,LOG_SETUP_INIT
,"key exchange failed: no address for peer");
1371 static void activate_new_key(struct site
*st
)
1373 struct transform_inst_if
*t
;
1375 /* We have three transform instances, which we swap between old,
1377 t
=st
->auxiliary_key
.transform
;
1378 st
->auxiliary_key
.transform
=st
->current
.transform
;
1379 st
->current
.transform
=st
->new_transform
;
1380 st
->new_transform
=t
;
1381 dispose_transform(&st
->new_transform
);
1384 st
->auxiliary_is_new
=0;
1385 st
->auxiliary_key
.key_timeout
=st
->current
.key_timeout
;
1386 st
->current
.key_timeout
=st
->now
+st
->key_lifetime
;
1387 st
->renegotiate_key_time
=st
->now
+st
->key_renegotiate_time
;
1388 transport_peers_copy(st
,&st
->peers
,&st
->setup_peers
);
1389 st
->current
.remote_session_id
=st
->setup_session_id
;
1391 /* Compute the inter-site MTU. This is min( our_mtu, their_mtu ).
1392 * But their mtu be unspecified, in which case we just use ours. */
1393 uint32_t intersite_mtu
=
1394 MIN(st
->mtu_target
, st
->remote_adv_mtu ?
: ~(uint32_t)0);
1395 st
->netlink
->set_mtu(st
->netlink
->st
,intersite_mtu
);
1397 slog(st
,LOG_ACTIVATE_KEY
,"new key activated"
1398 " (mtu ours=%"PRId32
" theirs=%"PRId32
" intersite=%"PRId32
")",
1399 st
->mtu_target
, st
->remote_adv_mtu
, intersite_mtu
);
1400 enter_state_run(st
);
1403 static void delete_one_key(struct site
*st
, struct data_key
*key
,
1404 cstring_t reason
, cstring_t which
, uint32_t loglevel
)
1406 if (!is_transform_valid(key
->transform
)) return;
1407 if (reason
) slog(st
,loglevel
,"%s deleted (%s)",which
,reason
);
1408 dispose_transform(&key
->transform
);
1412 static void delete_keys(struct site
*st
, cstring_t reason
, uint32_t loglevel
)
1414 if (current_valid(st
)) {
1415 slog(st
,loglevel
,"session closed (%s)",reason
);
1417 delete_one_key(st
,&st
->current
,0,0,0);
1418 set_link_quality(st
);
1420 delete_one_key(st
,&st
->auxiliary_key
,0,0,0);
1423 static void state_assert(struct site
*st
, bool_t ok
)
1425 if (!ok
) fatal("site:state_assert");
1428 static void enter_state_stop(struct site
*st
)
1430 st
->state
=SITE_STOP
;
1432 delete_keys(st
,"entering state STOP",LOG_TIMEOUT_KEY
);
1433 dispose_transform(&st
->new_transform
);
1436 static void set_link_quality(struct site
*st
)
1439 if (current_valid(st
))
1440 quality
=LINK_QUALITY_UP
;
1441 else if (st
->state
==SITE_WAIT
|| st
->state
==SITE_STOP
)
1442 quality
=LINK_QUALITY_DOWN
;
1443 else if (st
->addresses
)
1444 quality
=LINK_QUALITY_DOWN_CURRENT_ADDRESS
;
1445 else if (transport_peers_valid(&st
->peers
))
1446 quality
=LINK_QUALITY_DOWN_STALE_ADDRESS
;
1448 quality
=LINK_QUALITY_DOWN
;
1450 st
->netlink
->set_quality(st
->netlink
->st
,quality
);
1453 static void enter_state_run(struct site
*st
)
1455 slog(st
,LOG_STATE
,"entering state RUN");
1459 st
->setup_session_id
=0;
1460 transport_peers_clear(st
,&st
->setup_peers
);
1461 FILLZERO(st
->localN
);
1462 FILLZERO(st
->remoteN
);
1463 dispose_transform(&st
->new_transform
);
1464 memset(st
->dhsecret
,0,st
->dh
->len
);
1465 if (st
->sharedsecret
) memset(st
->sharedsecret
,0,st
->sharedsecretlen
);
1466 set_link_quality(st
);
1468 if (st
->keepalive
&& !current_valid(st
))
1469 initiate_key_setup(st
, "keepalive", 0);
1472 static bool_t
ensure_resolving(struct site
*st
)
1474 /* Reentrancy hazard: may call site_resolve_callback and hence
1475 * enter_new_state, enter_state_* and generate_msg*. */
1476 if (st
->resolving_count
)
1479 assert(st
->addresses
);
1481 /* resolver->request might reentrantly call site_resolve_callback
1482 * which will decrement st->resolving, so we need to increment it
1483 * twice beforehand to prevent decrement from thinking we're
1484 * finished, and decrement it ourselves. Alternatively if
1485 * everything fails then there are no callbacks due and we simply
1486 * set it to 0 and return false.. */
1487 st
->resolving_n_results_stored
=0;
1488 st
->resolving_n_results_all
=0;
1489 st
->resolving_count
+=2;
1490 const char **addrp
=st
->addresses
;
1491 const char *address
;
1493 for (; (address
=*addrp
++); ) {
1494 bool_t ok
= st
->resolver
->request(st
->resolver
->st
,address
,
1495 st
->remoteport
,st
->comms
[0],
1496 site_resolve_callback
,st
);
1498 st
->resolving_count
++;
1502 st
->resolving_count
=0;
1505 decrement_resolving_count(st
,2);
1509 static bool_t
enter_state_resolve(struct site
*st
)
1511 /* Reentrancy hazard! See ensure_resolving. */
1512 state_assert(st
,st
->state
==SITE_RUN
);
1513 slog(st
,LOG_STATE
,"entering state RESOLVE");
1514 st
->state
=SITE_RESOLVE
;
1515 return ensure_resolving(st
);
1518 static bool_t
enter_new_state(struct site
*st
, uint32_t next
)
1520 bool_t (*gen
)(struct site
*st
);
1523 slog(st
,LOG_STATE
,"entering state %s",state_name(next
));
1526 state_assert(st
,st
->state
==SITE_RUN
|| st
->state
==SITE_RESOLVE
);
1530 state_assert(st
,st
->state
==SITE_RUN
|| st
->state
==SITE_RESOLVE
||
1531 st
->state
==SITE_SENTMSG1
|| st
->state
==SITE_WAIT
);
1535 state_assert(st
,st
->state
==SITE_SENTMSG1
);
1536 BUF_FREE(&st
->buffer
);
1540 state_assert(st
,st
->state
==SITE_SENTMSG2
);
1541 BUF_FREE(&st
->buffer
);
1545 state_assert(st
,st
->state
==SITE_SENTMSG3
);
1546 BUF_FREE(&st
->buffer
);
1550 state_assert(st
,st
->state
==SITE_SENTMSG4
);
1551 BUF_FREE(&st
->buffer
);
1556 fatal("enter_new_state(%s): invalid new state",state_name(next
));
1560 if (hacky_par_start_failnow()) return False
;
1562 r
= gen(st
) && send_msg(st
);
1565 st
->setup_retries
, st
->setup_retry_interval
,
1570 if (next
==SITE_RUN
) {
1571 BUF_FREE(&st
->buffer
); /* Never reused */
1572 st
->timeout
=0; /* Never retransmit */
1573 activate_new_key(st
);
1577 slog(st
,LOG_ERROR
,"error entering state %s",state_name(next
));
1578 st
->buffer
.free
=False
; /* Unconditionally use the buffer; it may be
1579 in either state, and enter_state_wait() will
1581 enter_state_wait(st
);
1585 /* msg7 tells our peer that we're about to forget our key */
1586 static bool_t
send_msg7(struct site
*st
, cstring_t reason
)
1588 cstring_t transform_err
;
1590 if (current_valid(st
) && st
->buffer
.free
1591 && transport_peers_valid(&st
->peers
)) {
1592 BUF_ALLOC(&st
->buffer
,"site:MSG7");
1593 buffer_init(&st
->buffer
,calculate_max_start_pad());
1594 buf_append_uint32(&st
->buffer
,LABEL_MSG7
);
1595 buf_append_string(&st
->buffer
,reason
);
1596 if (call_transform_forwards(st
, st
->current
.transform
,
1597 &st
->buffer
, &transform_err
))
1599 buf_prepend_uint32(&st
->buffer
,LABEL_MSG0
);
1600 buf_prepend_uint32(&st
->buffer
,st
->index
);
1601 buf_prepend_uint32(&st
->buffer
,st
->current
.remote_session_id
);
1602 transport_xmit(st
,&st
->peers
,&st
->buffer
,True
);
1603 BUF_FREE(&st
->buffer
);
1610 /* We go into this state if our peer becomes uncommunicative. Similar to
1611 the "stop" state, we forget all session keys for a while, before
1612 re-entering the "run" state. */
1613 static void enter_state_wait(struct site
*st
)
1615 slog(st
,LOG_STATE
,"entering state WAIT");
1616 st
->timeout
=st
->now
+st
->wait_timeout
;
1617 st
->state
=SITE_WAIT
;
1618 set_link_quality(st
);
1619 BUF_FREE(&st
->buffer
); /* will have had an outgoing packet in it */
1620 /* XXX Erase keys etc. */
1623 static void generate_prod(struct site
*st
, struct buffer_if
*buf
)
1626 buf_append_uint32(buf
,0);
1627 buf_append_uint32(buf
,0);
1628 buf_append_uint32(buf
,LABEL_PROD
);
1629 buf_append_string(buf
,st
->localname
);
1630 buf_append_string(buf
,st
->remotename
);
1633 static void generate_send_prod(struct site
*st
,
1634 const struct comm_addr
*source
)
1636 if (!st
->allow_send_prod
) return; /* too soon */
1637 if (!(st
->state
==SITE_RUN
|| st
->state
==SITE_RESOLVE
||
1638 st
->state
==SITE_WAIT
)) return; /* we'd ignore peer's MSG1 */
1640 slog(st
,LOG_SETUP_INIT
,"prodding peer for key exchange");
1641 st
->allow_send_prod
=0;
1642 generate_prod(st
,&st
->scratch
);
1643 bool_t ok
= comm_addr_sendmsg(st
, source
, &st
->scratch
);
1644 dump_packet(st
,&st
->scratch
,source
,False
,ok
);
1647 static inline void site_settimeout(uint64_t timeout
, int *timeout_io
)
1650 int64_t offset
=timeout
-*now
;
1651 if (offset
<0) offset
=0;
1652 if (offset
>INT_MAX
) offset
=INT_MAX
;
1653 if (*timeout_io
<0 || offset
<*timeout_io
)
1658 static int site_beforepoll(void *sst
, struct pollfd
*fds
, int *nfds_io
,
1661 struct site
*st
=sst
;
1663 BEFOREPOLL_WANT_FDS(0); /* We don't use any file descriptors */
1666 /* Work out when our next timeout is. The earlier of 'timeout' or
1667 'current.key_timeout'. A stored value of '0' indicates no timeout
1669 site_settimeout(st
->timeout
, timeout_io
);
1670 site_settimeout(st
->current
.key_timeout
, timeout_io
);
1671 site_settimeout(st
->auxiliary_key
.key_timeout
, timeout_io
);
1673 return 0; /* success */
1676 static void check_expiry(struct site
*st
, struct data_key
*key
,
1679 if (key
->key_timeout
&& *now
>key
->key_timeout
) {
1680 delete_one_key(st
,key
,"maximum life exceeded",which
,LOG_TIMEOUT_KEY
);
1684 /* NB site_afterpoll will be called before site_beforepoll is ever called */
1685 static void site_afterpoll(void *sst
, struct pollfd
*fds
, int nfds
)
1687 struct site
*st
=sst
;
1690 if (st
->timeout
&& *now
>st
->timeout
) {
1692 if (st
->state
>=SITE_SENTMSG1
&& st
->state
<=SITE_SENTMSG5
) {
1693 if (!hacky_par_start_failnow())
1695 } else if (st
->state
==SITE_WAIT
) {
1696 enter_state_run(st
);
1698 slog(st
,LOG_ERROR
,"site_afterpoll: unexpected timeout, state=%d",
1702 check_expiry(st
,&st
->current
,"current key");
1703 check_expiry(st
,&st
->auxiliary_key
,"auxiliary key");
1706 /* This function is called by the netlink device to deliver packets
1707 intended for the remote network. The packet is in "raw" wire
1708 format, but is guaranteed to be word-aligned. */
1709 static void site_outgoing(void *sst
, struct buffer_if
*buf
)
1711 struct site
*st
=sst
;
1712 cstring_t transform_err
;
1714 if (st
->state
==SITE_STOP
) {
1719 st
->allow_send_prod
=1;
1721 /* In all other states we consider delivering the packet if we have
1722 a valid key and a valid address to send it to. */
1723 if (current_valid(st
) && transport_peers_valid(&st
->peers
)) {
1724 /* Transform it and send it */
1726 buf_prepend_uint32(buf
,LABEL_MSG9
);
1727 if (call_transform_forwards(st
, st
->current
.transform
,
1728 buf
, &transform_err
))
1730 buf_prepend_uint32(buf
,LABEL_MSG0
);
1731 buf_prepend_uint32(buf
,st
->index
);
1732 buf_prepend_uint32(buf
,st
->current
.remote_session_id
);
1733 transport_xmit(st
,&st
->peers
,buf
,False
);
1740 slog(st
,LOG_DROP
,"discarding outgoing packet of size %d",buf
->size
);
1742 initiate_key_setup(st
,"outgoing packet",0);
1745 static bool_t
named_for_us(struct site
*st
, const struct buffer_if
*buf_in
,
1746 uint32_t type
, struct msg
*m
)
1747 /* For packets which are identified by the local and remote names.
1748 * If it has our name and our peer's name in it it's for us. */
1750 struct buffer_if buf
[1];
1751 buffer_readonly_clone(buf
,buf_in
);
1752 return unpick_msg(st
,type
,buf
,m
)
1753 && name_matches(&m
->remote
,st
->remotename
)
1754 && name_matches(&m
->local
,st
->localname
);
1757 /* This function is called by the communication device to deliver
1758 packets from our peers.
1759 It should return True if the packet is recognised as being for
1760 this current site instance (and should therefore not be processed
1761 by other sites), even if the packet was otherwise ignored. */
1762 static bool_t
site_incoming(void *sst
, struct buffer_if
*buf
,
1763 const struct comm_addr
*source
)
1765 struct site
*st
=sst
;
1767 if (buf
->size
< 12) return False
;
1769 uint32_t dest
=get_uint32(buf
->start
);
1770 uint32_t msgtype
=get_uint32(buf
->start
+8);
1771 struct msg named_msg
;
1773 if (msgtype
==LABEL_MSG1
) {
1774 if (!named_for_us(st
,buf
,msgtype
,&named_msg
))
1776 /* It's a MSG1 addressed to us. Decide what to do about it. */
1777 dump_packet(st
,buf
,source
,True
,True
);
1778 if (st
->state
==SITE_RUN
|| st
->state
==SITE_RESOLVE
||
1779 st
->state
==SITE_WAIT
) {
1780 /* We should definitely process it */
1781 transport_compute_setupinit_peers(st
,0,0,source
);
1782 if (process_msg1(st
,buf
,source
,&named_msg
)) {
1783 slog(st
,LOG_SETUP_INIT
,"key setup initiated by peer");
1784 bool_t entered
=enter_new_state(st
,SITE_SENTMSG2
);
1785 if (entered
&& st
->addresses
&& st
->local_mobile
)
1786 /* We must do this as the very last thing, because
1787 the resolver callback might reenter us. */
1788 ensure_resolving(st
);
1790 slog(st
,LOG_ERROR
,"failed to process incoming msg1");
1794 } else if (st
->state
==SITE_SENTMSG1
) {
1795 /* We've just sent a message 1! They may have crossed on
1796 the wire. If we have priority then we ignore the
1797 incoming one, otherwise we process it as usual. */
1798 if (st
->setup_priority
) {
1800 slog(st
,LOG_DUMP
,"crossed msg1s; we are higher "
1801 "priority => ignore incoming msg1");
1804 slog(st
,LOG_DUMP
,"crossed msg1s; we are lower "
1805 "priority => use incoming msg1");
1806 if (process_msg1(st
,buf
,source
,&named_msg
)) {
1807 BUF_FREE(&st
->buffer
); /* Free our old message 1 */
1808 transport_setup_msgok(st
,source
);
1809 enter_new_state(st
,SITE_SENTMSG2
);
1811 slog(st
,LOG_ERROR
,"failed to process an incoming "
1812 "crossed msg1 (we have low priority)");
1818 /* The message 1 was received at an unexpected stage of the
1819 key setup. XXX POLICY - what do we do? */
1820 slog(st
,LOG_UNEXPECTED
,"unexpected incoming message 1");
1824 if (msgtype
==LABEL_PROD
) {
1825 if (!named_for_us(st
,buf
,msgtype
,&named_msg
))
1827 dump_packet(st
,buf
,source
,True
,True
);
1828 if (st
->state
!=SITE_RUN
) {
1829 slog(st
,LOG_DROP
,"ignoring PROD when not in state RUN");
1830 } else if (current_valid(st
)) {
1831 slog(st
,LOG_DROP
,"ignoring PROD when we think we have a key");
1833 initiate_key_setup(st
,"peer sent PROD packet",source
);
1838 if (dest
==st
->index
) {
1839 /* Explicitly addressed to us */
1840 if (msgtype
!=LABEL_MSG0
) dump_packet(st
,buf
,source
,True
,True
);
1843 /* If the source is our current peer then initiate a key setup,
1844 because our peer's forgotten the key */
1845 if (get_uint32(buf
->start
+4)==st
->current
.remote_session_id
) {
1847 initiated
= initiate_key_setup(st
,"received a NAK",source
);
1848 if (!initiated
) generate_send_prod(st
,source
);
1850 slog(st
,LOG_SEC
,"bad incoming NAK");
1854 process_msg0(st
,buf
,source
);
1857 /* Setup packet: should not have been explicitly addressed
1859 slog(st
,LOG_SEC
,"incoming explicitly addressed msg1");
1862 /* Setup packet: expected only in state SENTMSG1 */
1863 if (st
->state
!=SITE_SENTMSG1
) {
1864 slog(st
,LOG_UNEXPECTED
,"unexpected MSG2");
1865 } else if (process_msg2(st
,buf
,source
)) {
1866 transport_setup_msgok(st
,source
);
1867 enter_new_state(st
,SITE_SENTMSG3
);
1869 slog(st
,LOG_SEC
,"invalid MSG2");
1874 /* Setup packet: expected only in state SENTMSG2 */
1875 if (st
->state
!=SITE_SENTMSG2
) {
1876 slog(st
,LOG_UNEXPECTED
,"unexpected MSG3");
1877 } else if (process_msg3(st
,buf
,source
,msgtype
)) {
1878 transport_setup_msgok(st
,source
);
1879 enter_new_state(st
,SITE_SENTMSG4
);
1881 slog(st
,LOG_SEC
,"invalid MSG3");
1885 /* Setup packet: expected only in state SENTMSG3 */
1886 if (st
->state
!=SITE_SENTMSG3
) {
1887 slog(st
,LOG_UNEXPECTED
,"unexpected MSG4");
1888 } else if (process_msg4(st
,buf
,source
)) {
1889 transport_setup_msgok(st
,source
);
1890 enter_new_state(st
,SITE_SENTMSG5
);
1892 slog(st
,LOG_SEC
,"invalid MSG4");
1896 /* Setup packet: expected only in state SENTMSG4 */
1897 /* (may turn up in state RUN if our return MSG6 was lost
1898 and the new key has already been activated. In that
1899 case we discard it. The peer will realise that we
1900 are using the new key when they see our data packets.
1901 Until then the peer's data packets to us get discarded. */
1902 if (st
->state
==SITE_SENTMSG4
) {
1903 if (process_msg5(st
,buf
,source
,st
->new_transform
)) {
1904 transport_setup_msgok(st
,source
);
1905 enter_new_state(st
,SITE_RUN
);
1907 slog(st
,LOG_SEC
,"invalid MSG5");
1909 } else if (st
->state
==SITE_RUN
) {
1910 if (process_msg5(st
,buf
,source
,st
->current
.transform
)) {
1911 slog(st
,LOG_DROP
,"got MSG5, retransmitting MSG6");
1912 transport_setup_msgok(st
,source
);
1913 create_msg6(st
,st
->current
.transform
,
1914 st
->current
.remote_session_id
);
1915 transport_xmit(st
,&st
->peers
,&st
->buffer
,True
);
1916 BUF_FREE(&st
->buffer
);
1918 slog(st
,LOG_SEC
,"invalid MSG5 (in state RUN)");
1921 slog(st
,LOG_UNEXPECTED
,"unexpected MSG5");
1925 /* Setup packet: expected only in state SENTMSG5 */
1926 if (st
->state
!=SITE_SENTMSG5
) {
1927 slog(st
,LOG_UNEXPECTED
,"unexpected MSG6");
1928 } else if (process_msg6(st
,buf
,source
)) {
1929 BUF_FREE(&st
->buffer
); /* Free message 5 */
1930 transport_setup_msgok(st
,source
);
1931 activate_new_key(st
);
1933 slog(st
,LOG_SEC
,"invalid MSG6");
1937 slog(st
,LOG_SEC
,"received message of unknown type 0x%08x",
1948 static void site_control(void *vst
, bool_t run
)
1950 struct site
*st
=vst
;
1951 if (run
) enter_state_run(st
);
1952 else enter_state_stop(st
);
1955 static void site_phase_hook(void *sst
, uint32_t newphase
)
1957 struct site
*st
=sst
;
1959 /* The program is shutting down; tell our peer */
1960 send_msg7(st
,"shutting down");
1963 static void site_childpersist_clearkeys(void *sst
, uint32_t newphase
)
1965 struct site
*st
=sst
;
1966 dispose_transform(&st
->current
.transform
);
1967 dispose_transform(&st
->auxiliary_key
.transform
);
1968 dispose_transform(&st
->new_transform
);
1969 /* Not much point overwiting the signing key, since we loaded it
1970 from disk, and it is only valid prospectively if at all,
1972 /* XXX it would be best to overwrite the DH state, because that
1973 _is_ relevant to forward secrecy. However we have no
1974 convenient interface for doing that and in practice gmp has
1975 probably dribbled droppings all over the malloc arena. A good
1976 way to fix this would be to have a privsep child for asymmetric
1977 crypto operations, but that's a task for another day. */
1980 static list_t
*site_apply(closure_t
*self
, struct cloc loc
, dict_t
*context
,
1983 static uint32_t index_sequence
;
1991 st
->cl
.description
="site";
1992 st
->cl
.type
=CL_SITE
;
1994 st
->cl
.interface
=&st
->ops
;
1996 st
->ops
.control
=site_control
;
1997 st
->ops
.status
=site_status
;
1999 /* First parameter must be a dict */
2000 item
=list_elem(args
,0);
2001 if (!item
|| item
->type
!=t_dict
)
2002 cfgfatal(loc
,"site","parameter must be a dictionary\n");
2004 dict
=item
->data
.dict
;
2005 st
->localname
=dict_read_string(dict
, "local-name", True
, "site", loc
);
2006 st
->remotename
=dict_read_string(dict
, "name", True
, "site", loc
);
2008 st
->keepalive
=dict_read_bool(dict
,"keepalive",False
,"site",loc
,False
);
2010 st
->peer_mobile
=dict_read_bool(dict
,"mobile",False
,"site",loc
,False
);
2012 dict_read_bool(dict
,"local-mobile",False
,"site",loc
,False
);
2014 /* Sanity check (which also allows the 'sites' file to include
2015 site() closures for all sites including our own): refuse to
2016 talk to ourselves */
2017 if (strcmp(st
->localname
,st
->remotename
)==0) {
2018 Message(M_DEBUG
,"site %s: local-name==name -> ignoring this site\n",
2020 if (st
->peer_mobile
!= st
->local_mobile
)
2021 cfgfatal(loc
,"site","site %s's peer-mobile=%d"
2022 " but our local-mobile=%d\n",
2023 st
->localname
, st
->peer_mobile
, st
->local_mobile
);
2027 if (st
->peer_mobile
&& st
->local_mobile
) {
2028 Message(M_WARNING
,"site %s: site is mobile but so are we"
2029 " -> ignoring this site\n", st
->remotename
);
2034 assert(index_sequence
< 0xffffffffUL
);
2035 st
->index
= ++index_sequence
;
2036 st
->local_capabilities
= 0;
2037 st
->netlink
=find_cl_if(dict
,"link",CL_NETLINK
,True
,"site",loc
);
2039 #define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \
2040 list_t *things##_cfg=dict_lookup(dict,dictkey); \
2041 if (!things##_cfg) \
2042 cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \
2043 st->nthings=list_length(things##_cfg); \
2044 NEW_ARY(st->things,st->nthings); \
2045 assert(st->nthings); \
2046 for (i=0; i<st->nthings; i++) { \
2047 item_t *item=list_elem(things##_cfg,i); \
2048 if (item->type!=t_closure) \
2049 cfgfatal(loc,"site","%s is not a closure\n",dictkey); \
2050 closure_t *cl=item->data.closure; \
2051 if (cl->type!=CL_TYPE) \
2052 cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \
2053 st->things[i]=cl->interface; \
2057 GET_CLOSURE_LIST("comm",comms
,ncomms
,CL_COMM
);
2059 NEW_ARY(st
->commclientinfos
, st
->ncomms
);
2060 dict_t
*comminfo
= dict_read_dict(dict
,"comm-info",False
,"site",loc
);
2061 for (i
=0; i
<st
->ncomms
; i
++) {
2062 st
->commclientinfos
[i
] =
2064 st
->comms
[i
]->clientinfo(st
->comms
[i
],comminfo
,loc
);
2067 st
->resolver
=find_cl_if(dict
,"resolver",CL_RESOLVER
,True
,"site",loc
);
2068 st
->log
=find_cl_if(dict
,"log",CL_LOG
,True
,"site",loc
);
2069 st
->random
=find_cl_if(dict
,"random",CL_RANDOMSRC
,True
,"site",loc
);
2071 st
->privkey
=find_cl_if(dict
,"local-key",CL_RSAPRIVKEY
,True
,"site",loc
);
2072 st
->addresses
=dict_read_string_array(dict
,"address",False
,"site",loc
,0);
2074 st
->remoteport
=dict_read_number(dict
,"port",True
,"site",loc
,0);
2075 else st
->remoteport
=0;
2076 st
->pubkey
=find_cl_if(dict
,"key",CL_RSAPUBKEY
,True
,"site",loc
);
2078 GET_CLOSURE_LIST("transform",transforms
,ntransforms
,CL_TRANSFORM
);
2080 st
->dh
=find_cl_if(dict
,"dh",CL_DH
,True
,"site",loc
);
2081 st
->hash
=find_cl_if(dict
,"hash",CL_HASH
,True
,"site",loc
);
2083 #define DEFAULT(D) (st->peer_mobile || st->local_mobile \
2084 ? DEFAULT_MOBILE_##D : DEFAULT_##D)
2085 #define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
2087 st
->key_lifetime
= CFG_NUMBER("key-lifetime", KEY_LIFETIME
);
2088 st
->setup_retries
= CFG_NUMBER("setup-retries", SETUP_RETRIES
);
2089 st
->setup_retry_interval
= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL
);
2090 st
->wait_timeout
= CFG_NUMBER("wait-time", WAIT_TIME
);
2091 st
->mtu_target
= dict_read_number(dict
,"mtu-target",False
,"site",loc
,0);
2093 st
->mobile_peer_expiry
= dict_read_number(
2094 dict
,"mobile-peer-expiry",False
,"site",loc
,DEFAULT_MOBILE_PEER_EXPIRY
);
2096 const char *peerskey
= st
->peer_mobile
2097 ?
"mobile-peers-max" : "static-peers-max";
2098 st
->transport_peers_max
= dict_read_number(
2099 dict
,peerskey
,False
,"site",loc
, st
->addresses ?
4 : 3);
2100 if (st
->transport_peers_max
<1 ||
2101 st
->transport_peers_max
>MAX_PEER_ADDRS
) {
2102 cfgfatal(loc
,"site", "%s must be in range 1.."
2103 STRING(MAX_PEER_ADDRS
) "\n", peerskey
);
2106 if (st
->key_lifetime
< DEFAULT(KEY_RENEGOTIATE_GAP
)*2)
2107 st
->key_renegotiate_time
=st
->key_lifetime
/2;
2109 st
->key_renegotiate_time
=st
->key_lifetime
-DEFAULT(KEY_RENEGOTIATE_GAP
);
2110 st
->key_renegotiate_time
=dict_read_number(
2111 dict
,"renegotiate-time",False
,"site",loc
,st
->key_renegotiate_time
);
2112 if (st
->key_renegotiate_time
> st
->key_lifetime
) {
2113 cfgfatal(loc
,"site",
2114 "renegotiate-time must be less than key-lifetime\n");
2117 st
->log_events
=string_list_to_word(dict_lookup(dict
,"log-events"),
2118 log_event_table
,"site");
2120 st
->resolving_count
=0;
2121 st
->allow_send_prod
=0;
2123 st
->tunname
=safe_malloc(strlen(st
->localname
)+strlen(st
->remotename
)+5,
2125 sprintf(st
->tunname
,"%s<->%s",st
->localname
,st
->remotename
);
2127 /* The information we expect to see in incoming messages of type 1 */
2128 /* fixme: lots of unchecked overflows here, but the results are only
2129 corrupted packets rather than undefined behaviour */
2130 st
->setup_priority
=(strcmp(st
->localname
,st
->remotename
)>0);
2132 buffer_new(&st
->buffer
,SETUP_BUFFER_LEN
);
2134 buffer_new(&st
->scratch
,SETUP_BUFFER_LEN
);
2135 BUF_ALLOC(&st
->scratch
,"site:scratch");
2137 /* We are interested in poll(), but only for timeouts. We don't have
2138 any fds of our own. */
2139 register_for_poll(st
, site_beforepoll
, site_afterpoll
, "site");
2142 st
->remote_capabilities
=0;
2143 st
->chosen_transform
=0;
2144 st
->current
.key_timeout
=0;
2145 st
->auxiliary_key
.key_timeout
=0;
2146 transport_peers_clear(st
,&st
->peers
);
2147 transport_peers_clear(st
,&st
->setup_peers
);
2148 /* XXX mlock these */
2149 st
->dhsecret
=safe_malloc(st
->dh
->len
,"site:dhsecret");
2150 st
->sharedsecretlen
=st
->sharedsecretallocd
=0;
2153 for (i
=0; i
<st
->ntransforms
; i
++) {
2154 struct transform_if
*ti
=st
->transforms
[i
];
2155 uint32_t capbit
= 1UL << ti
->capab_transformnum
;
2156 if (st
->local_capabilities
& capbit
)
2157 slog(st
,LOG_ERROR
,"transformnum capability bit"
2158 " %d (%#"PRIx32
") reused", ti
->capab_transformnum
, capbit
);
2159 st
->local_capabilities
|= capbit
;
2162 /* We need to register the remote networks with the netlink device */
2163 uint32_t netlink_mtu
; /* local virtual interface mtu */
2164 st
->netlink
->reg(st
->netlink
->st
, site_outgoing
, st
, &netlink_mtu
);
2165 if (!st
->mtu_target
)
2166 st
->mtu_target
=netlink_mtu
;
2168 for (i
=0; i
<st
->ncomms
; i
++)
2169 st
->comms
[i
]->request_notify(st
->comms
[i
]->st
, st
, site_incoming
);
2171 st
->current
.transform
=0;
2172 st
->auxiliary_key
.transform
=0;
2173 st
->new_transform
=0;
2174 st
->auxiliary_is_new
=0;
2176 enter_state_stop(st
);
2178 add_hook(PHASE_SHUTDOWN
,site_phase_hook
,st
);
2179 add_hook(PHASE_CHILDPERSIST
,site_childpersist_clearkeys
,st
);
2181 return new_closure(&st
->cl
);
2184 void site_module(dict_t
*dict
)
2186 add_closure(dict
,"site",site_apply
);
2190 /***** TRANSPORT PEERS definitions *****/
2192 static void transport_peers_debug(struct site
*st
, transport_peers
*dst
,
2193 const char *didwhat
,
2194 int nargs
, const struct comm_addr
*args
,
2199 if (!(st
->log_events
& LOG_PEER_ADDRS
))
2200 return; /* an optimisation */
2202 slog(st
, LOG_PEER_ADDRS
, "peers (%s) %s nargs=%d => npeers=%d",
2203 (dst
==&st
->peers ?
"data" :
2204 dst
==&st
->setup_peers ?
"setup" : "UNKNOWN"),
2205 didwhat
, nargs
, dst
->npeers
);
2207 for (i
=0, argp
=(void*)args
;
2209 i
++, (argp
+=stride?stride
:sizeof(*args
))) {
2210 const struct comm_addr
*ca
=(void*)argp
;
2211 slog(st
, LOG_PEER_ADDRS
, " args: addrs[%d]=%s",
2212 i
, comm_addr_to_string(ca
));
2214 for (i
=0; i
<dst
->npeers
; i
++) {
2215 struct timeval diff
;
2216 timersub(tv_now
,&dst
->peers
[i
].last
,&diff
);
2217 const struct comm_addr
*ca
=&dst
->peers
[i
].addr
;
2218 slog(st
, LOG_PEER_ADDRS
, " peers: addrs[%d]=%s T-%ld.%06ld",
2219 i
, comm_addr_to_string(ca
),
2220 (unsigned long)diff
.tv_sec
, (unsigned long)diff
.tv_usec
);
2224 static void transport_peers_expire(struct site
*st
, transport_peers
*peers
) {
2225 /* peers must be sorted first */
2226 int previous_peers
=peers
->npeers
;
2227 struct timeval oldest
;
2228 oldest
.tv_sec
= tv_now
->tv_sec
- st
->mobile_peer_expiry
;
2229 oldest
.tv_usec
= tv_now
->tv_usec
;
2230 while (peers
->npeers
>1 &&
2231 timercmp(&peers
->peers
[peers
->npeers
-1].last
, &oldest
, <))
2233 if (peers
->npeers
!= previous_peers
)
2234 transport_peers_debug(st
,peers
,"expire", 0,0,0);
2237 static bool_t
transport_peer_record_one(struct site
*st
, transport_peers
*peers
,
2238 const struct comm_addr
*ca
,
2239 const struct timeval
*tv
) {
2240 /* returns false if output is full */
2243 if (peers
->npeers
>= st
->transport_peers_max
)
2246 for (search
=0; search
<peers
->npeers
; search
++)
2247 if (comm_addr_equal(&peers
->peers
[search
].addr
, ca
))
2250 peers
->peers
[peers
->npeers
].addr
= *ca
;
2251 peers
->peers
[peers
->npeers
].last
= *tv
;
2256 static void transport_record_peers(struct site
*st
, transport_peers
*peers
,
2257 const struct comm_addr
*addrs
, int naddrs
,
2259 /* We add addrs into peers. The new entries end up at the front
2260 * and displace entries towards the end (perhaps even off the
2261 * end). Any existing matching entries are moved up to the front.
2263 * Caller must first call transport_peers_expire. */
2266 /* avoids debug for uninteresting updates */
2268 for (i
=0; i
<peers
->npeers
; i
++) {
2269 if (comm_addr_equal(&addrs
[0], &peers
->peers
[i
].addr
)) {
2270 memmove(peers
->peers
+1, peers
->peers
,
2271 sizeof(peers
->peers
[0]) * i
);
2272 peers
->peers
[0].addr
= addrs
[0];
2273 peers
->peers
[0].last
= *tv_now
;
2279 int old_npeers
=peers
->npeers
;
2280 transport_peer old_peers
[old_npeers
];
2281 COPY_ARRAY(old_peers
,peers
->peers
,old_npeers
);
2285 for (i
=0; i
<naddrs
; i
++) {
2286 if (!transport_peer_record_one(st
,peers
, &addrs
[i
], tv_now
))
2289 for (i
=0; i
<old_npeers
; i
++) {
2290 const transport_peer
*old
=&old_peers
[i
];
2291 if (!transport_peer_record_one(st
,peers
, &old
->addr
, &old
->last
))
2295 transport_peers_debug(st
,peers
,m
, naddrs
,addrs
,0);
2298 static void transport_expire_record_peers(struct site
*st
,
2299 transport_peers
*peers
,
2300 const struct comm_addr
*addrs
,
2301 int naddrs
, const char *m
) {
2302 /* Convenience function */
2303 transport_peers_expire(st
,peers
);
2304 transport_record_peers(st
,peers
,addrs
,naddrs
,m
);
2307 static bool_t
transport_compute_setupinit_peers(struct site
*st
,
2308 const struct comm_addr
*configured_addrs
/* 0 if none or not found */,
2309 int n_configured_addrs
/* 0 if none or not found */,
2310 const struct comm_addr
*incoming_packet_addr
/* 0 if none */) {
2311 if (!n_configured_addrs
&& !incoming_packet_addr
&&
2312 !transport_peers_valid(&st
->peers
))
2315 slog(st
,LOG_SETUP_INIT
,
2316 "using: %d configured addr(s);%s %d old peer addrs(es)",
2318 incoming_packet_addr ?
" incoming packet address;" : "",
2321 /* Non-mobile peers try addresses until one is plausible. The
2322 * effect is that this code always tries first the configured
2323 * address if supplied, or otherwise the address of the incoming
2324 * PROD, or finally the existing data peer if one exists; this is
2327 transport_peers_copy(st
,&st
->setup_peers
,&st
->peers
);
2328 transport_peers_expire(st
,&st
->setup_peers
);
2330 if (incoming_packet_addr
)
2331 transport_record_peers(st
,&st
->setup_peers
,
2332 incoming_packet_addr
,1, "incoming");
2334 if (n_configured_addrs
)
2335 transport_record_peers(st
,&st
->setup_peers
,
2336 configured_addrs
,n_configured_addrs
, "setupinit");
2338 assert(transport_peers_valid(&st
->setup_peers
));
2342 static void transport_setup_msgok(struct site
*st
, const struct comm_addr
*a
) {
2343 if (st
->peer_mobile
)
2344 transport_expire_record_peers(st
,&st
->setup_peers
,a
,1,"setupmsg");
2346 static void transport_data_msgok(struct site
*st
, const struct comm_addr
*a
) {
2347 if (st
->peer_mobile
)
2348 transport_expire_record_peers(st
,&st
->peers
,a
,1,"datamsg");
2351 static int transport_peers_valid(transport_peers
*peers
) {
2352 return peers
->npeers
;
2354 static void transport_peers_clear(struct site
*st
, transport_peers
*peers
) {
2356 transport_peers_debug(st
,peers
,"clear",0,0,0);
2358 static void transport_peers_copy(struct site
*st
, transport_peers
*dst
,
2359 const transport_peers
*src
) {
2360 dst
->npeers
=src
->npeers
;
2361 COPY_ARRAY(dst
->peers
, src
->peers
, dst
->npeers
);
2362 transport_peers_debug(st
,dst
,"copy",
2363 src
->npeers
, &src
->peers
->addr
, sizeof(*src
->peers
));
2366 static void transport_resolve_complete(struct site
*st
,
2367 const struct comm_addr
*addrs
,
2369 transport_expire_record_peers(st
,&st
->peers
,addrs
,naddrs
,
2371 transport_expire_record_peers(st
,&st
->setup_peers
,addrs
,naddrs
,
2375 static void transport_resolve_complete_tardy(struct site
*st
,
2376 const struct comm_addr
*addrs
,
2378 transport_expire_record_peers(st
,&st
->peers
,addrs
,naddrs
,
2379 "resolved tardily");
2382 static void transport_peers__copy_by_mask(transport_peer
*out
, int *nout_io
,
2384 const transport_peers
*inp
) {
2385 /* out and in->peers may be the same region, or nonoverlapping */
2386 const transport_peer
*in
=inp
->peers
;
2388 for (slot
=0; slot
<inp
->npeers
; slot
++) {
2389 if (!(mask
& (1U << slot
)))
2391 if (!(out
==in
&& slot
==*nout_io
))
2392 COPY_OBJ(out
[*nout_io
], in
[slot
]);
2397 void transport_xmit(struct site
*st
, transport_peers
*peers
,
2398 struct buffer_if
*buf
, bool_t candebug
) {
2400 transport_peers_expire(st
, peers
);
2401 unsigned failed
=0; /* bitmask */
2402 assert(MAX_PEER_ADDRS
< sizeof(unsigned)*CHAR_BIT
);
2405 for (slot
=0; slot
<peers
->npeers
; slot
++) {
2406 transport_peer
*peer
=&peers
->peers
[slot
];
2407 bool_t ok
= comm_addr_sendmsg(st
, &peer
->addr
, buf
);
2409 dump_packet(st
, buf
, &peer
->addr
, False
, ok
);
2411 failed
|= 1U << slot
;
2414 if (ok
&& !st
->peer_mobile
)
2417 /* Now we need to demote/delete failing addrs: if we are mobile we
2418 * merely demote them; otherwise we delete them. */
2419 if (st
->local_mobile
) {
2420 unsigned expected
= ((1U << nfailed
)-1) << (peers
->npeers
-nfailed
);
2421 /* `expected' has all the failures at the end already */
2422 if (failed
!= expected
) {
2424 transport_peer failedpeers
[nfailed
];
2425 transport_peers__copy_by_mask(failedpeers
, &fslot
, failed
,peers
);
2426 assert(fslot
== nfailed
);
2428 transport_peers__copy_by_mask(peers
->peers
,&wslot
,~failed
,peers
);
2429 assert(wslot
+nfailed
== peers
->npeers
);
2430 COPY_ARRAY(peers
->peers
+wslot
, failedpeers
, nfailed
);
2431 transport_peers_debug(st
,peers
,"mobile failure reorder",0,0,0);
2434 if (failed
&& peers
->npeers
> 1) {
2436 transport_peers__copy_by_mask(peers
->peers
,&wslot
,~failed
,peers
);
2437 peers
->npeers
=wslot
;
2438 transport_peers_debug(st
,peers
,"non-mobile failure cleanup",0,0,0);
2443 /***** END of transport peers declarations *****/