5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2001 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
21 * Server side of the protocols.
25 #include "serverincludes.h"
26 #include "server_internal.h"
28 SILC_TASK_CALLBACK(silc_server_protocol_connection_auth);
29 SILC_TASK_CALLBACK(silc_server_protocol_key_exchange);
30 SILC_TASK_CALLBACK(silc_server_protocol_rekey);
32 extern char *silc_version_string;
35 * Key Exhange protocol functions
39 silc_verify_public_key_internal(SilcServer server, SilcSocketConnection sock,
40 SilcSocketType conn_type,
41 unsigned char *pk, uint32 pk_len,
42 SilcSKEPKType pk_type)
44 char file[256], filename[256], *fingerprint;
47 if (pk_type != SILC_SKE_PK_TYPE_SILC) {
48 SILC_LOG_WARNING(("We don't support %s (%s) port %d public key type %d",
49 sock->hostname, sock->ip, sock->port, pk_type));
53 /* Accept client keys without verification */
54 if (conn_type == SILC_SOCKET_TYPE_CLIENT) {
55 SILC_LOG_DEBUG(("Accepting client public key without verification"));
59 /* XXX For now, accept server keys without verification too. We are
60 currently always doing mutual authentication so the proof of posession
61 of the private key is verified, and if server is authenticated in
62 conn auth protocol with public key we MUST have the key already. */
64 /* Rest is unreachable code! */
66 memset(filename, 0, sizeof(filename));
67 memset(file, 0, sizeof(file));
68 snprintf(file, sizeof(file) - 1, "serverkey_%s_%d.pub", sock->hostname,
70 snprintf(filename, sizeof(filename) - 1, SILC_ETCDIR "/serverkeys/%s",
73 /* Create serverkeys directory if it doesn't exist. */
74 if (stat(SILC_ETCDIR "/serverkeys", &st) < 0) {
75 /* If dir doesn't exist */
76 if (errno == ENOENT) {
77 if (mkdir(SILC_ETCDIR "/serverkeys", 0755) < 0) {
78 SILC_LOG_ERROR(("Couldn't create `%s' directory\n",
79 SILC_ETCDIR "/serverkeys"));
83 SILC_LOG_ERROR(("%s\n", strerror(errno)));
88 /* Take fingerprint of the public key */
89 fingerprint = silc_hash_fingerprint(NULL, pk, pk_len);
90 SILC_LOG_DEBUG(("Received server %s (%s) port %d public key (%s)",
91 sock->hostname, sock->ip, sock->port, fingerprint));
92 silc_free(fingerprint);
94 /* Check whether this key already exists */
95 if (stat(filename, &st) < 0) {
96 /* We don't have it, then cache it. */
97 SILC_LOG_DEBUG(("New public key from server"));
99 silc_pkcs_save_public_key_data(filename, pk, pk_len,
103 /* The key already exists, verify it. */
104 SilcPublicKey public_key;
105 unsigned char *encpk;
108 SILC_LOG_DEBUG(("We have the public key saved locally"));
110 /* Load the key file */
111 if (!silc_pkcs_load_public_key(filename, &public_key,
113 if (!silc_pkcs_load_public_key(filename, &public_key,
114 SILC_PKCS_FILE_BIN)) {
115 SILC_LOG_WARNING(("Could not load local copy of the %s (%s) port %d "
116 "server public key", sock->hostname, sock->ip,
119 /* Save the key for future checking */
121 silc_pkcs_save_public_key_data(filename, pk, pk_len,
126 /* Encode the key data */
127 encpk = silc_pkcs_public_key_encode(public_key, &encpk_len);
129 SILC_LOG_WARNING(("Local copy of the server %s (%s) port %d public key "
130 "is malformed", sock->hostname, sock->ip, sock->port));
132 /* Save the key for future checking */
134 silc_pkcs_save_public_key_data(filename, pk, pk_len, SILC_PKCS_FILE_PEM);
138 if (memcmp(pk, encpk, encpk_len)) {
139 SILC_LOG_WARNING(("%s (%s) port %d server public key does not match "
140 "with local copy", sock->hostname, sock->ip,
142 SILC_LOG_WARNING(("It is possible that the key has expired or changed"));
143 SILC_LOG_WARNING(("It is also possible that some one is performing "
144 "man-in-the-middle attack"));
145 SILC_LOG_WARNING(("Will not accept the server %s (%s) port %d public "
147 sock->hostname, sock->ip, sock->port));
151 /* Local copy matched */
156 /* Callback that is called when we have received KE2 payload from
157 responder. We try to verify the public key now. */
160 silc_server_protocol_ke_verify_key(SilcSKE ske,
161 unsigned char *pk_data,
163 SilcSKEPKType pk_type,
165 SilcSKEVerifyCbCompletion completion,
166 void *completion_context)
168 SilcProtocol protocol = (SilcProtocol)context;
169 SilcServerKEInternalContext *ctx =
170 (SilcServerKEInternalContext *)protocol->context;
171 SilcServer server = (SilcServer)ctx->server;
173 SILC_LOG_DEBUG(("Start"));
175 if (silc_verify_public_key_internal(server, ctx->sock,
176 (ctx->responder == FALSE ?
177 SILC_SOCKET_TYPE_ROUTER:
178 ctx->sconfig ? SILC_SOCKET_TYPE_SERVER :
179 ctx->rconfig ? SILC_SOCKET_TYPE_ROUTER :
180 SILC_SOCKET_TYPE_CLIENT),
181 pk_data, pk_len, pk_type))
182 completion(ske, SILC_SKE_STATUS_OK, completion_context);
184 completion(ske, SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
188 /* Packet sending callback. This function is provided as packet sending
189 routine to the Key Exchange functions. */
191 static void silc_server_protocol_ke_send_packet(SilcSKE ske,
196 SilcProtocol protocol = (SilcProtocol)context;
197 SilcServerKEInternalContext *ctx =
198 (SilcServerKEInternalContext *)protocol->context;
199 SilcServer server = (SilcServer)ctx->server;
201 /* Send the packet immediately */
202 silc_server_packet_send(server, ske->sock,
203 type, 0, packet->data, packet->len, TRUE);
206 /* Sets the negotiated key material into use for particular connection. */
208 int silc_server_protocol_ke_set_keys(SilcServer server,
210 SilcSocketConnection sock,
211 SilcSKEKeyMaterial *keymat,
216 SilcSKEDiffieHellmanGroup group,
219 SilcUnknownEntry conn_data;
220 SilcIDListData idata;
222 SILC_LOG_DEBUG(("Setting new key into use"));
224 conn_data = silc_calloc(1, sizeof(*conn_data));
225 idata = (SilcIDListData)conn_data;
227 /* Allocate cipher to be used in the communication */
228 if (!silc_cipher_alloc(cipher->cipher->name, &idata->send_key)) {
229 silc_free(conn_data);
232 if (!silc_cipher_alloc(cipher->cipher->name, &idata->receive_key)) {
233 silc_free(conn_data);
237 if (!silc_hmac_alloc((char *)silc_hmac_get_name(hmac), NULL,
238 &idata->hmac_send)) {
239 silc_cipher_free(idata->send_key);
240 silc_cipher_free(idata->receive_key);
241 silc_free(conn_data);
245 if (!silc_hmac_alloc((char *)silc_hmac_get_name(hmac), NULL,
246 &idata->hmac_receive)) {
247 silc_cipher_free(idata->send_key);
248 silc_cipher_free(idata->receive_key);
249 silc_hmac_free(idata->hmac_send);
250 silc_free(conn_data);
254 if (is_responder == TRUE) {
255 silc_cipher_set_key(idata->send_key, keymat->receive_enc_key,
256 keymat->enc_key_len);
257 silc_cipher_set_iv(idata->send_key, keymat->receive_iv);
258 silc_cipher_set_key(idata->receive_key, keymat->send_enc_key,
259 keymat->enc_key_len);
260 silc_cipher_set_iv(idata->receive_key, keymat->send_iv);
261 silc_hmac_set_key(idata->hmac_send, keymat->receive_hmac_key,
262 keymat->hmac_key_len);
263 silc_hmac_set_key(idata->hmac_receive, keymat->send_hmac_key,
264 keymat->hmac_key_len);
266 silc_cipher_set_key(idata->send_key, keymat->send_enc_key,
267 keymat->enc_key_len);
268 silc_cipher_set_iv(idata->send_key, keymat->send_iv);
269 silc_cipher_set_key(idata->receive_key, keymat->receive_enc_key,
270 keymat->enc_key_len);
271 silc_cipher_set_iv(idata->receive_key, keymat->receive_iv);
272 silc_hmac_set_key(idata->hmac_send, keymat->send_hmac_key,
273 keymat->hmac_key_len);
274 silc_hmac_set_key(idata->hmac_receive, keymat->receive_hmac_key,
275 keymat->hmac_key_len);
278 idata->rekey = silc_calloc(1, sizeof(*idata->rekey));
279 idata->rekey->send_enc_key =
280 silc_calloc(keymat->enc_key_len / 8,
281 sizeof(*idata->rekey->send_enc_key));
282 memcpy(idata->rekey->send_enc_key,
283 keymat->send_enc_key, keymat->enc_key_len / 8);
284 idata->rekey->enc_key_len = keymat->enc_key_len / 8;
286 if (ske->start_payload->flags & SILC_SKE_SP_FLAG_PFS)
287 idata->rekey->pfs = TRUE;
288 idata->rekey->ske_group = silc_ske_group_get_number(group);
291 if (!silc_hash_alloc(hash->hash->name, &idata->hash)) {
292 silc_cipher_free(idata->send_key);
293 silc_cipher_free(idata->receive_key);
294 silc_hmac_free(idata->hmac_send);
295 silc_hmac_free(idata->hmac_receive);
296 silc_free(conn_data);
300 /* Save the remote host's public key */
301 silc_pkcs_public_key_decode(ske->ke1_payload->pk_data,
302 ske->ke1_payload->pk_len, &idata->public_key);
303 if (ske->prop->flags & SILC_SKE_SP_FLAG_MUTUAL)
304 silc_hash_make(server->sha1hash, ske->ke1_payload->pk_data,
305 ske->ke1_payload->pk_len, idata->fingerprint);
307 sock->user_data = (void *)conn_data;
309 SILC_LOG_INFO(("%s (%s) security properties: %s %s %s",
310 sock->hostname, sock->ip,
311 idata->send_key->cipher->name,
312 (char *)silc_hmac_get_name(idata->hmac_send),
313 idata->hash->hash->name));
318 /* Check remote host version string */
320 SilcSKEStatus silc_ske_check_version(SilcSKE ske, unsigned char *version,
321 uint32 len, void *context)
323 SilcSKEStatus status = SILC_SKE_STATUS_OK;
325 int maj = 0, min = 0, build = 0, maj2 = 0, min2 = 0, build2 = 0;
327 SILC_LOG_INFO(("%s (%s) is version %s", ske->sock->hostname,
328 ske->sock->ip, version));
330 /* Check for initial version string */
331 if (!strstr(version, "SILC-1.0-"))
332 status = SILC_SKE_STATUS_BAD_VERSION;
334 /* Check software version */
338 status = SILC_SKE_STATUS_BAD_VERSION;
341 cp = strchr(cp, '.');
347 cp = strchr(cp, '.');
349 build = atoi(cp + 1);
352 cp = silc_version_string + 9;
354 status = SILC_SKE_STATUS_BAD_VERSION;
357 cp = strchr(cp, '.');
363 cp = strchr(cp, '.');
365 build2 = atoi(cp + 1);
369 status = SILC_SKE_STATUS_BAD_VERSION;
372 status = SILC_SKE_STATUS_BAD_VERSION;
375 /* XXX < 0.6 is not allowed */
376 if (maj == 0 && min < 5)
377 status = SILC_SKE_STATUS_BAD_VERSION;
379 /* XXX backward support for 0.6.1 */
380 if (maj == 0 && min == 6 && build < 2)
381 ske->backward_version = 1;
386 /* Callback that is called by the SKE to indicate that it is safe to
387 continue the execution of the protocol. This is used only if we are
388 initiator. Is given as argument to the silc_ske_initiator_finish or
389 silc_ske_responder_phase_2 functions. This is called due to the fact
390 that the public key verification process is asynchronous and we must
391 not continue the protocl until the public key has been verified and
392 this callback is called. */
394 static void silc_server_protocol_ke_continue(SilcSKE ske, void *context)
396 SilcProtocol protocol = (SilcProtocol)context;
397 SilcServerKEInternalContext *ctx =
398 (SilcServerKEInternalContext *)protocol->context;
399 SilcServer server = (SilcServer)ctx->server;
401 SILC_LOG_DEBUG(("Start"));
403 if (ske->status != SILC_SKE_STATUS_OK) {
404 SILC_LOG_WARNING(("Error (%s) during Key Exchange protocol",
405 silc_ske_map_status(ske->status)));
406 SILC_LOG_DEBUG(("Error (%s) during Key Exchange protocol",
407 silc_ske_map_status(ske->status)));
409 protocol->state = SILC_PROTOCOL_STATE_ERROR;
410 silc_protocol_execute(protocol, server->schedule, 0, 300000);
414 /* Send Ok to the other end. We will end the protocol as responder
415 sends Ok to us when we will take the new keys into use. */
416 if (ctx->responder == FALSE) {
417 silc_ske_end(ctx->ske);
419 /* End the protocol on the next round */
420 protocol->state = SILC_PROTOCOL_STATE_END;
423 /* Advance protocol state and call the next state if we are responder.
424 This happens when this callback was sent to silc_ske_responder_phase_2
426 if (ctx->responder == TRUE) {
428 silc_protocol_execute(protocol, server->schedule, 0, 100000);
432 /* Performs key exchange protocol. This is used for both initiator
433 and responder key exchange. This is performed always when accepting
434 new connection to the server. This may be called recursively. */
436 SILC_TASK_CALLBACK(silc_server_protocol_key_exchange)
438 SilcProtocol protocol = (SilcProtocol)context;
439 SilcServerKEInternalContext *ctx =
440 (SilcServerKEInternalContext *)protocol->context;
441 SilcServer server = (SilcServer)ctx->server;
442 SilcSKEStatus status = SILC_SKE_STATUS_OK;
444 SILC_LOG_DEBUG(("Start"));
446 if (protocol->state == SILC_PROTOCOL_STATE_UNKNOWN)
447 protocol->state = SILC_PROTOCOL_STATE_START;
449 SILC_LOG_DEBUG(("State=%d", protocol->state));
451 switch(protocol->state) {
452 case SILC_PROTOCOL_STATE_START:
459 /* Allocate Key Exchange object */
460 ske = silc_ske_alloc();
462 ske->rng = server->rng;
464 silc_ske_set_callbacks(ske, silc_server_protocol_ke_send_packet, NULL,
465 silc_server_protocol_ke_verify_key,
466 silc_server_protocol_ke_continue,
467 silc_ske_check_version, context);
469 if (ctx->responder == TRUE) {
470 /* Start the key exchange by processing the received security
471 properties packet from initiator. */
472 status = silc_ske_responder_start(ske, ctx->rng, ctx->sock,
474 ctx->packet->buffer, TRUE);
476 SilcSKEStartPayload *start_payload;
478 /* Assemble security properties. */
479 silc_ske_assemble_security_properties(ske, SILC_SKE_SP_FLAG_MUTUAL,
483 /* Start the key exchange by sending our security properties
484 to the remote end. */
485 status = silc_ske_initiator_start(ske, ctx->rng, ctx->sock,
489 /* Return now if the procedure is pending. */
490 if (status == SILC_SKE_STATUS_PENDING)
493 if (status != SILC_SKE_STATUS_OK) {
494 SILC_LOG_WARNING(("Error (%s) during Key Exchange protocol",
495 silc_ske_map_status(status)));
496 SILC_LOG_DEBUG(("Error (%s) during Key Exchange protocol",
497 silc_ske_map_status(status)));
499 protocol->state = SILC_PROTOCOL_STATE_ERROR;
500 silc_protocol_execute(protocol, server->schedule, 0, 300000);
504 /* Advance protocol state and call the next state if we are responder */
506 if (ctx->responder == TRUE)
507 silc_protocol_execute(protocol, server->schedule, 0, 100000);
515 if (ctx->responder == TRUE) {
516 /* Sends the selected security properties to the initiator. */
517 status = silc_ske_responder_phase_1(ctx->ske,
518 ctx->ske->start_payload);
520 /* Call Phase-1 function. This processes the Key Exchange Start
521 paylaod reply we just got from the responder. The callback
522 function will receive the processed payload where we will
524 status = silc_ske_initiator_phase_1(ctx->ske, ctx->packet->buffer);
527 /* Return now if the procedure is pending. */
528 if (status == SILC_SKE_STATUS_PENDING)
531 if (status != SILC_SKE_STATUS_OK) {
532 SILC_LOG_WARNING(("Error (%s) during Key Exchange protocol",
533 silc_ske_map_status(status)));
534 SILC_LOG_DEBUG(("Error (%s) during Key Exchange protocol",
535 silc_ske_map_status(status)));
537 protocol->state = SILC_PROTOCOL_STATE_ERROR;
538 silc_protocol_execute(protocol, server->schedule, 0, 300000);
542 /* Advance protocol state and call next state if we are initiator */
544 if (ctx->responder == FALSE)
545 silc_protocol_execute(protocol, server->schedule, 0, 100000);
553 if (ctx->responder == TRUE) {
554 /* Process the received Key Exchange 1 Payload packet from
555 the initiator. This also creates our parts of the Diffie
556 Hellman algorithm. The silc_server_protocol_ke_continue
557 will be called after the public key has been verified. */
558 status = silc_ske_responder_phase_2(ctx->ske, ctx->packet->buffer);
560 /* Call the Phase-2 function. This creates Diffie Hellman
561 key exchange parameters and sends our public part inside
562 Key Exhange 1 Payload to the responder. */
563 status = silc_ske_initiator_phase_2(ctx->ske,
565 server->private_key);
569 /* Return now if the procedure is pending. */
570 if (status == SILC_SKE_STATUS_PENDING)
573 if (status != SILC_SKE_STATUS_OK) {
574 SILC_LOG_WARNING(("Error (%s) during Key Exchange protocol",
575 silc_ske_map_status(status)));
576 SILC_LOG_DEBUG(("Error (%s) during Key Exchange protocol",
577 silc_ske_map_status(status)));
579 protocol->state = SILC_PROTOCOL_STATE_ERROR;
580 silc_protocol_execute(protocol, server->schedule, 0, 300000);
590 if (ctx->responder == TRUE) {
591 /* This creates the key exchange material and sends our
592 public parts to the initiator inside Key Exchange 2 Payload. */
593 status = silc_ske_responder_finish(ctx->ske,
596 SILC_SKE_PK_TYPE_SILC);
598 /* End the protocol on the next round */
599 protocol->state = SILC_PROTOCOL_STATE_END;
601 /* Finish the protocol. This verifies the Key Exchange 2 payload
602 sent by responder. The silc_server_protocol_ke_continue will
603 be called after the public key has been verified. */
604 status = silc_ske_initiator_finish(ctx->ske, ctx->packet->buffer);
607 /* Return now if the procedure is pending. */
608 if (status == SILC_SKE_STATUS_PENDING)
611 if (status != SILC_SKE_STATUS_OK) {
612 SILC_LOG_WARNING(("Error (%s) during Key Exchange protocol",
613 silc_ske_map_status(status)));
614 SILC_LOG_DEBUG(("Error (%s) during Key Exchange protocol",
615 silc_ske_map_status(status)));
617 protocol->state = SILC_PROTOCOL_STATE_ERROR;
618 silc_protocol_execute(protocol, server->schedule, 0, 300000);
624 case SILC_PROTOCOL_STATE_END:
629 SilcSKEKeyMaterial *keymat;
630 int key_len = silc_cipher_get_key_len(ctx->ske->prop->cipher);
631 int hash_len = ctx->ske->prop->hash->hash->hash_len;
633 /* Process the key material */
634 keymat = silc_calloc(1, sizeof(*keymat));
635 status = silc_ske_process_key_material(ctx->ske, 16, key_len, hash_len,
637 if (status != SILC_SKE_STATUS_OK) {
638 protocol->state = SILC_PROTOCOL_STATE_ERROR;
639 silc_protocol_execute(protocol, server->schedule, 0, 300000);
640 silc_ske_free_key_material(keymat);
643 ctx->keymat = keymat;
645 /* Send Ok to the other end if we are responder. If we are initiator
646 we have sent this already. */
647 if (ctx->responder == TRUE)
648 silc_ske_end(ctx->ske);
650 /* Unregister the timeout task since the protocol has ended.
651 This was the timeout task to be executed if the protocol is
652 not completed fast enough. */
653 if (ctx->timeout_task)
654 silc_schedule_task_del(server->schedule, ctx->timeout_task);
656 /* Assure that after calling final callback there cannot be pending
657 executions for this protocol anymore. This just unregisters any
658 timeout callbacks for this protocol. */
659 silc_protocol_cancel(protocol, server->schedule);
661 /* Call the final callback */
662 if (protocol->final_callback)
663 silc_protocol_execute_final(protocol, server->schedule);
665 silc_protocol_free(protocol);
669 case SILC_PROTOCOL_STATE_ERROR:
674 /* Send abort notification */
675 silc_ske_abort(ctx->ske, ctx->ske->status);
677 /* Unregister the timeout task since the protocol has ended.
678 This was the timeout task to be executed if the protocol is
679 not completed fast enough. */
680 if (ctx->timeout_task)
681 silc_schedule_task_del(server->schedule, ctx->timeout_task);
683 /* Assure that after calling final callback there cannot be pending
684 executions for this protocol anymore. This just unregisters any
685 timeout callbacks for this protocol. */
686 silc_protocol_cancel(protocol, server->schedule);
688 /* On error the final callback is always called. */
689 if (protocol->final_callback)
690 silc_protocol_execute_final(protocol, server->schedule);
692 silc_protocol_free(protocol);
695 case SILC_PROTOCOL_STATE_FAILURE:
697 * We have received failure from remote
700 /* Unregister the timeout task since the protocol has ended.
701 This was the timeout task to be executed if the protocol is
702 not completed fast enough. */
703 if (ctx->timeout_task)
704 silc_schedule_task_del(server->schedule, ctx->timeout_task);
706 /* Assure that after calling final callback there cannot be pending
707 executions for this protocol anymore. This just unregisters any
708 timeout callbacks for this protocol. */
709 silc_protocol_cancel(protocol, server->schedule);
711 /* On error the final callback is always called. */
712 if (protocol->final_callback)
713 silc_protocol_execute_final(protocol, server->schedule);
715 silc_protocol_free(protocol);
718 case SILC_PROTOCOL_STATE_UNKNOWN:
724 * Connection Authentication protocol functions
728 silc_server_password_authentication(SilcServer server, char *remote_auth,
731 if (!remote_auth || !local_auth)
734 if (!memcmp(remote_auth, local_auth, strlen(local_auth)))
741 silc_server_public_key_authentication(SilcServer server,
742 SilcPublicKey pub_key,
751 if (!pub_key || !sign)
754 silc_pkcs_alloc(pub_key->name, &pkcs);
755 if (!silc_pkcs_public_key_set(pkcs, pub_key)) {
756 silc_pkcs_free(pkcs);
760 /* Make the authentication data. Protocol says it is HASH plus
762 len = ske->hash_len + ske->start_payload_copy->len;
763 auth = silc_buffer_alloc(len);
764 silc_buffer_pull_tail(auth, len);
765 silc_buffer_format(auth,
766 SILC_STR_UI_XNSTRING(ske->hash, ske->hash_len),
767 SILC_STR_UI_XNSTRING(ske->start_payload_copy->data,
768 ske->start_payload_copy->len),
771 /* Verify signature */
772 if (silc_pkcs_verify_with_hash(pkcs, ske->prop->hash, sign, sign_len,
773 auth->data, auth->len)) {
774 silc_pkcs_free(pkcs);
775 silc_buffer_free(auth);
779 silc_pkcs_free(pkcs);
780 silc_buffer_free(auth);
785 silc_server_get_public_key_auth(SilcServer server,
786 unsigned char **auth_data,
787 uint32 *auth_data_len,
796 /* Make the authentication data. Protocol says it is HASH plus
798 len = ske->hash_len + ske->start_payload_copy->len;
799 auth = silc_buffer_alloc(len);
800 silc_buffer_pull_tail(auth, len);
801 silc_buffer_format(auth,
802 SILC_STR_UI_XNSTRING(ske->hash, ske->hash_len),
803 SILC_STR_UI_XNSTRING(ske->start_payload_copy->data,
804 ske->start_payload_copy->len),
807 *auth_data = silc_calloc(silc_pkcs_get_key_len(pkcs), sizeof(**auth_data));
808 if (silc_pkcs_sign_with_hash(pkcs, ske->prop->hash, auth->data,
809 auth->len, *auth_data, auth_data_len)) {
810 silc_buffer_free(auth);
814 silc_free(*auth_data);
815 silc_buffer_free(auth);
819 /* Function that actually performs the authentication to the remote. This
820 supports both passphrase and public key authentication. */
823 silc_server_get_authentication(SilcServerConnAuthInternalContext *ctx,
824 char *local_passphrase,
825 void *local_publickey,
826 unsigned char *remote_auth,
827 uint32 remote_auth_len)
829 SilcServer server = (SilcServer)ctx->server;
830 SilcSKE ske = ctx->ske;
833 /* If we don't have authentication data set at all we do not require
834 authentication at all */
835 if (!local_passphrase && !local_publickey) {
836 SILC_LOG_DEBUG(("No authentication required"));
840 /* If both passphrase and public key is provided then we'll try both of
841 them and see which one of them authenticates. If only one of them is
842 set, then try only that. */
844 /* Try first passphrase (as it is faster to check) */
845 if (local_passphrase) {
846 SILC_LOG_DEBUG(("Password authentication"));
847 result = silc_server_password_authentication(server, local_passphrase,
851 /* Try public key authenetication */
852 if (!result && local_publickey) {
853 SILC_LOG_DEBUG(("Public key authentication"));
854 result = silc_server_public_key_authentication(server,
864 /* Performs connection authentication protocol. If responder, we
865 authenticate the remote data received. If initiator, we will send
866 authentication data to the remote end. */
868 SILC_TASK_CALLBACK(silc_server_protocol_connection_auth)
870 SilcProtocol protocol = (SilcProtocol)context;
871 SilcServerConnAuthInternalContext *ctx =
872 (SilcServerConnAuthInternalContext *)protocol->context;
873 SilcServer server = (SilcServer)ctx->server;
875 SILC_LOG_DEBUG(("Start"));
877 if (protocol->state == SILC_PROTOCOL_STATE_UNKNOWN)
878 protocol->state = SILC_PROTOCOL_STATE_START;
880 SILC_LOG_DEBUG(("State=%d", protocol->state));
882 switch(protocol->state) {
883 case SILC_PROTOCOL_STATE_START:
889 if (ctx->responder == TRUE) {
891 * We are receiving party
896 unsigned char *auth_data = NULL;
898 SILC_LOG_INFO(("Performing authentication protocol for %s (%s)",
899 ctx->sock->hostname, ctx->sock->ip));
901 /* Parse the received authentication data packet. The received
902 payload is Connection Auth Payload. */
903 ret = silc_buffer_unformat(ctx->packet->buffer,
904 SILC_STR_UI_SHORT(&payload_len),
905 SILC_STR_UI_SHORT(&conn_type),
908 SILC_LOG_DEBUG(("Bad payload in authentication packet"));
909 protocol->state = SILC_PROTOCOL_STATE_ERROR;
910 silc_protocol_execute(protocol, server->schedule, 0, 300000);
914 if (payload_len != ctx->packet->buffer->len) {
915 SILC_LOG_DEBUG(("Bad payload in authentication packet"));
916 protocol->state = SILC_PROTOCOL_STATE_ERROR;
917 silc_protocol_execute(protocol, server->schedule, 0, 300000);
923 if (conn_type < SILC_SOCKET_TYPE_CLIENT ||
924 conn_type > SILC_SOCKET_TYPE_ROUTER) {
925 SILC_LOG_ERROR(("Bad connection type %d", conn_type));
926 protocol->state = SILC_PROTOCOL_STATE_ERROR;
927 silc_protocol_execute(protocol, server->schedule, 0, 300000);
931 if (payload_len > 0) {
932 /* Get authentication data */
933 silc_buffer_pull(ctx->packet->buffer, 4);
934 ret = silc_buffer_unformat(ctx->packet->buffer,
935 SILC_STR_UI_XNSTRING_ALLOC(&auth_data,
939 SILC_LOG_DEBUG(("Bad payload in authentication packet"));
940 protocol->state = SILC_PROTOCOL_STATE_ERROR;
941 silc_protocol_execute(protocol, server->schedule, 0, 300000);
947 * Check the remote connection type and make sure that we have
948 * configured this connection. If we haven't allowed this connection
949 * the authentication must be failed.
952 SILC_LOG_DEBUG(("Remote connection type %d", conn_type));
954 /* Remote end is client */
955 if (conn_type == SILC_SOCKET_TYPE_CLIENT) {
956 SilcServerConfigSectionClient *client = ctx->cconfig;
959 ret = silc_server_get_authentication(ctx, client->passphrase,
961 auth_data, payload_len);
963 /* Authentication failed */
964 SILC_LOG_ERROR(("Authentication failed"));
965 SILC_LOG_DEBUG(("Authentication failed"));
966 silc_free(auth_data);
967 protocol->state = SILC_PROTOCOL_STATE_ERROR;
968 silc_protocol_execute(protocol, server->schedule, 0, 300000);
972 SILC_LOG_DEBUG(("No configuration for remote client connection"));
973 SILC_LOG_ERROR(("Remote client connection not configured"));
974 SILC_LOG_ERROR(("Authentication failed"));
975 silc_free(auth_data);
976 protocol->state = SILC_PROTOCOL_STATE_ERROR;
977 silc_protocol_execute(protocol, server->schedule,
983 /* Remote end is server */
984 if (conn_type == SILC_SOCKET_TYPE_SERVER) {
985 SilcServerConfigSectionServer *serv = ctx->sconfig;
988 ret = silc_server_get_authentication(ctx, serv->passphrase,
990 auth_data, payload_len);
992 /* Authentication failed */
993 SILC_LOG_ERROR(("Authentication failed"));
994 SILC_LOG_DEBUG(("Authentication failed"));
995 silc_free(auth_data);
996 protocol->state = SILC_PROTOCOL_STATE_ERROR;
997 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1001 SILC_LOG_DEBUG(("No configuration for remote server connection"));
1002 SILC_LOG_ERROR(("Remote server connection not configured"));
1003 SILC_LOG_ERROR(("Authentication failed"));
1004 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1005 silc_protocol_execute(protocol, server->schedule,
1007 silc_free(auth_data);
1012 /* Remote end is router */
1013 if (conn_type == SILC_SOCKET_TYPE_ROUTER) {
1014 SilcServerConfigSectionRouter *serv = ctx->rconfig;
1017 ret = silc_server_get_authentication(ctx, serv->passphrase,
1019 auth_data, payload_len);
1021 /* Authentication failed */
1022 SILC_LOG_ERROR(("Authentication failed"));
1023 SILC_LOG_DEBUG(("Authentication failed"));
1024 silc_free(auth_data);
1025 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1026 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1030 SILC_LOG_DEBUG(("No configuration for remote router connection"));
1031 SILC_LOG_ERROR(("Remote router connection not configured"));
1032 SILC_LOG_ERROR(("Authentication failed"));
1033 silc_free(auth_data);
1034 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1035 silc_protocol_execute(protocol, server->schedule,
1041 silc_free(auth_data);
1043 /* Save connection type. This is later used to create the
1044 ID for the connection. */
1045 ctx->conn_type = conn_type;
1047 /* Advance protocol state. */
1048 protocol->state = SILC_PROTOCOL_STATE_END;
1049 silc_protocol_execute(protocol, server->schedule, 0, 0);
1053 * We are initiator. We are authenticating ourselves to a
1054 * remote server. We will send the authentication data to the
1055 * other end for verify.
1058 int payload_len = 0;
1059 unsigned char *auth_data = NULL;
1060 uint32 auth_data_len = 0;
1062 switch(ctx->auth_meth) {
1063 case SILC_AUTH_NONE:
1064 /* No authentication required */
1067 case SILC_AUTH_PASSWORD:
1068 /* Password authentication */
1069 if (ctx->auth_data && ctx->auth_data_len) {
1070 auth_data = strdup(ctx->auth_data);
1071 auth_data_len = ctx->auth_data_len;
1076 case SILC_AUTH_PUBLIC_KEY:
1078 /* Public key authentication */
1079 silc_server_get_public_key_auth(server, &auth_data, &auth_data_len,
1085 payload_len = 4 + auth_data_len;
1086 packet = silc_buffer_alloc(payload_len);
1087 silc_buffer_pull_tail(packet, SILC_BUFFER_END(packet));
1088 silc_buffer_format(packet,
1089 SILC_STR_UI_SHORT(payload_len),
1090 SILC_STR_UI_SHORT(server->server_type
1092 SILC_SOCKET_TYPE_SERVER :
1093 SILC_SOCKET_TYPE_ROUTER),
1094 SILC_STR_UI_XNSTRING(auth_data, auth_data_len),
1097 /* Send the packet to server */
1098 silc_server_packet_send(server, ctx->sock,
1099 SILC_PACKET_CONNECTION_AUTH, 0,
1100 packet->data, packet->len, TRUE);
1103 memset(auth_data, 0, auth_data_len);
1104 silc_free(auth_data);
1106 silc_buffer_free(packet);
1108 /* Next state is end of protocol */
1109 protocol->state = SILC_PROTOCOL_STATE_END;
1114 case SILC_PROTOCOL_STATE_END:
1119 unsigned char ok[4];
1121 SILC_PUT32_MSB(SILC_AUTH_OK, ok);
1123 /* Authentication successful */
1124 silc_server_packet_send(server, ctx->sock, SILC_PACKET_SUCCESS,
1127 /* Unregister the timeout task since the protocol has ended.
1128 This was the timeout task to be executed if the protocol is
1129 not completed fast enough. */
1130 if (ctx->timeout_task)
1131 silc_schedule_task_del(server->schedule, ctx->timeout_task);
1133 /* Assure that after calling final callback there cannot be pending
1134 executions for this protocol anymore. This just unregisters any
1135 timeout callbacks for this protocol. */
1136 silc_protocol_cancel(protocol, server->schedule);
1138 /* Protocol has ended, call the final callback */
1139 if (protocol->final_callback)
1140 silc_protocol_execute_final(protocol, server->schedule);
1142 silc_protocol_free(protocol);
1145 case SILC_PROTOCOL_STATE_ERROR:
1148 * Error. Send notify to remote.
1150 unsigned char error[4];
1152 SILC_PUT32_MSB(SILC_AUTH_FAILED, error);
1154 /* Authentication failed */
1155 silc_server_packet_send(server, ctx->sock, SILC_PACKET_FAILURE,
1158 /* Unregister the timeout task since the protocol has ended.
1159 This was the timeout task to be executed if the protocol is
1160 not completed fast enough. */
1161 if (ctx->timeout_task)
1162 silc_schedule_task_del(server->schedule, ctx->timeout_task);
1164 /* Assure that after calling final callback there cannot be pending
1165 executions for this protocol anymore. This just unregisters any
1166 timeout callbacks for this protocol. */
1167 silc_protocol_cancel(protocol, server->schedule);
1169 /* On error the final callback is always called. */
1170 if (protocol->final_callback)
1171 silc_protocol_execute_final(protocol, server->schedule);
1173 silc_protocol_free(protocol);
1177 case SILC_PROTOCOL_STATE_FAILURE:
1179 * We have received failure from remote
1182 /* Unregister the timeout task since the protocol has ended.
1183 This was the timeout task to be executed if the protocol is
1184 not completed fast enough. */
1185 if (ctx->timeout_task)
1186 silc_schedule_task_del(server->schedule, ctx->timeout_task);
1188 /* Assure that after calling final callback there cannot be pending
1189 executions for this protocol anymore. This just unregisters any
1190 timeout callbacks for this protocol. */
1191 silc_protocol_cancel(protocol, server->schedule);
1193 /* On error the final callback is always called. */
1194 if (protocol->final_callback)
1195 silc_protocol_execute_final(protocol, server->schedule);
1197 silc_protocol_free(protocol);
1200 case SILC_PROTOCOL_STATE_UNKNOWN:
1206 * Re-key protocol routines
1209 /* Actually takes the new keys into use. */
1212 silc_server_protocol_rekey_validate(SilcServer server,
1213 SilcServerRekeyInternalContext *ctx,
1214 SilcIDListData idata,
1215 SilcSKEKeyMaterial *keymat,
1218 if (ctx->responder == TRUE) {
1220 silc_cipher_set_key(idata->send_key, keymat->receive_enc_key,
1221 keymat->enc_key_len);
1222 silc_cipher_set_iv(idata->send_key, keymat->receive_iv);
1223 silc_hmac_set_key(idata->hmac_send, keymat->receive_hmac_key,
1224 keymat->hmac_key_len);
1226 silc_cipher_set_key(idata->receive_key, keymat->send_enc_key,
1227 keymat->enc_key_len);
1228 silc_cipher_set_iv(idata->receive_key, keymat->send_iv);
1229 silc_hmac_set_key(idata->hmac_receive, keymat->send_hmac_key,
1230 keymat->hmac_key_len);
1234 silc_cipher_set_key(idata->send_key, keymat->send_enc_key,
1235 keymat->enc_key_len);
1236 silc_cipher_set_iv(idata->send_key, keymat->send_iv);
1237 silc_hmac_set_key(idata->hmac_send, keymat->send_hmac_key,
1238 keymat->hmac_key_len);
1240 silc_cipher_set_key(idata->receive_key, keymat->receive_enc_key,
1241 keymat->enc_key_len);
1242 silc_cipher_set_iv(idata->receive_key, keymat->receive_iv);
1243 silc_hmac_set_key(idata->hmac_receive, keymat->receive_hmac_key,
1244 keymat->hmac_key_len);
1248 /* Save the current sending encryption key */
1250 memset(idata->rekey->send_enc_key, 0, idata->rekey->enc_key_len);
1251 silc_free(idata->rekey->send_enc_key);
1252 idata->rekey->send_enc_key =
1253 silc_calloc(keymat->enc_key_len / 8,
1254 sizeof(*idata->rekey->send_enc_key));
1255 memcpy(idata->rekey->send_enc_key, keymat->send_enc_key,
1256 keymat->enc_key_len / 8);
1257 idata->rekey->enc_key_len = keymat->enc_key_len / 8;
1261 /* This function actually re-generates (when not using PFS) the keys and
1262 takes them into use. */
1264 void silc_server_protocol_rekey_generate(SilcServer server,
1265 SilcServerRekeyInternalContext *ctx,
1268 SilcIDListData idata = (SilcIDListData)ctx->sock->user_data;
1269 SilcSKEKeyMaterial *keymat;
1270 uint32 key_len = silc_cipher_get_key_len(idata->send_key);
1271 uint32 hash_len = idata->hash->hash->hash_len;
1273 SILC_LOG_DEBUG(("Generating new %s session keys (no PFS)",
1274 send ? "sending" : "receiving"));
1276 /* Generate the new key */
1277 keymat = silc_calloc(1, sizeof(*keymat));
1278 silc_ske_process_key_material_data(idata->rekey->send_enc_key,
1279 idata->rekey->enc_key_len,
1280 16, key_len, hash_len,
1281 idata->hash, keymat);
1283 /* Set the keys into use */
1284 silc_server_protocol_rekey_validate(server, ctx, idata, keymat, send);
1286 silc_ske_free_key_material(keymat);
1289 /* This function actually re-generates (with PFS) the keys and
1290 takes them into use. */
1293 silc_server_protocol_rekey_generate_pfs(SilcServer server,
1294 SilcServerRekeyInternalContext *ctx,
1297 SilcIDListData idata = (SilcIDListData)ctx->sock->user_data;
1298 SilcSKEKeyMaterial *keymat;
1299 uint32 key_len = silc_cipher_get_key_len(idata->send_key);
1300 uint32 hash_len = idata->hash->hash->hash_len;
1301 unsigned char *tmpbuf;
1304 SILC_LOG_DEBUG(("Generating new %s session keys (with PFS)",
1305 send ? "sending" : "receiving"));
1307 /* Encode KEY to binary data */
1308 tmpbuf = silc_mp_mp2bin(ctx->ske->KEY, 0, &klen);
1310 /* Generate the new key */
1311 keymat = silc_calloc(1, sizeof(*keymat));
1312 silc_ske_process_key_material_data(tmpbuf, klen, 16, key_len, hash_len,
1313 idata->hash, keymat);
1315 /* Set the keys into use */
1316 silc_server_protocol_rekey_validate(server, ctx, idata, keymat, send);
1318 memset(tmpbuf, 0, klen);
1320 silc_ske_free_key_material(keymat);
1323 /* Packet sending callback. This function is provided as packet sending
1324 routine to the Key Exchange functions. */
1327 silc_server_protocol_rekey_send_packet(SilcSKE ske,
1329 SilcPacketType type,
1332 SilcProtocol protocol = (SilcProtocol)context;
1333 SilcServerRekeyInternalContext *ctx =
1334 (SilcServerRekeyInternalContext *)protocol->context;
1335 SilcServer server = (SilcServer)ctx->server;
1337 /* Send the packet immediately */
1338 silc_server_packet_send(server, ctx->sock,
1339 type, 0, packet->data, packet->len, FALSE);
1342 /* Performs re-key as defined in the SILC protocol specification. */
1344 SILC_TASK_CALLBACK(silc_server_protocol_rekey)
1346 SilcProtocol protocol = (SilcProtocol)context;
1347 SilcServerRekeyInternalContext *ctx =
1348 (SilcServerRekeyInternalContext *)protocol->context;
1349 SilcServer server = (SilcServer)ctx->server;
1350 SilcIDListData idata = (SilcIDListData)ctx->sock->user_data;
1351 SilcSKEStatus status;
1353 SILC_LOG_DEBUG(("Start"));
1355 if (protocol->state == SILC_PROTOCOL_STATE_UNKNOWN)
1356 protocol->state = SILC_PROTOCOL_STATE_START;
1358 SILC_LOG_DEBUG(("State=%d", protocol->state));
1360 switch(protocol->state) {
1361 case SILC_PROTOCOL_STATE_START:
1367 if (ctx->responder == TRUE) {
1369 * We are receiving party
1372 if (ctx->pfs == TRUE) {
1374 * Use Perfect Forward Secrecy, ie. negotiate the key material
1375 * using the SKE protocol.
1378 if (ctx->packet->type != SILC_PACKET_KEY_EXCHANGE_1) {
1379 /* Error in protocol */
1380 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1381 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1385 ctx->ske = silc_ske_alloc();
1386 ctx->ske->rng = server->rng;
1387 ctx->ske->prop = silc_calloc(1, sizeof(*ctx->ske->prop));
1388 silc_ske_group_get_by_number(idata->rekey->ske_group,
1389 &ctx->ske->prop->group);
1391 silc_ske_set_callbacks(ctx->ske,
1392 silc_server_protocol_rekey_send_packet,
1393 NULL, NULL, NULL, silc_ske_check_version,
1396 status = silc_ske_responder_phase_2(ctx->ske, ctx->packet->buffer);
1397 if (status != SILC_SKE_STATUS_OK) {
1398 SILC_LOG_WARNING(("Error (%s) during Re-key (PFS)",
1399 silc_ske_map_status(status)));
1401 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1402 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1406 /* Advance the protocol state */
1408 silc_protocol_execute(protocol, server->schedule, 0, 0);
1411 * Do normal and simple re-key.
1414 /* Send the REKEY_DONE to indicate we will take new keys into use */
1415 silc_server_packet_send(server, ctx->sock, SILC_PACKET_REKEY_DONE,
1418 /* After we send REKEY_DONE we must set the sending encryption
1419 key to the new key since all packets after this packet must
1420 encrypted with the new key. */
1421 silc_server_protocol_rekey_generate(server, ctx, TRUE);
1423 /* The protocol ends in next stage. */
1424 protocol->state = SILC_PROTOCOL_STATE_END;
1429 * We are the initiator of this protocol
1432 /* Start the re-key by sending the REKEY packet */
1433 silc_server_packet_send(server, ctx->sock, SILC_PACKET_REKEY,
1436 if (ctx->pfs == TRUE) {
1438 * Use Perfect Forward Secrecy, ie. negotiate the key material
1439 * using the SKE protocol.
1441 ctx->ske = silc_ske_alloc();
1442 ctx->ske->rng = server->rng;
1443 ctx->ske->prop = silc_calloc(1, sizeof(*ctx->ske->prop));
1444 silc_ske_group_get_by_number(idata->rekey->ske_group,
1445 &ctx->ske->prop->group);
1447 silc_ske_set_callbacks(ctx->ske,
1448 silc_server_protocol_rekey_send_packet,
1449 NULL, NULL, NULL, silc_ske_check_version,
1452 status = silc_ske_initiator_phase_2(ctx->ske, NULL, NULL);
1453 if (status != SILC_SKE_STATUS_OK) {
1454 SILC_LOG_WARNING(("Error (%s) during Re-key (PFS)",
1455 silc_ske_map_status(status)));
1457 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1458 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1462 /* Advance the protocol state */
1466 * Do normal and simple re-key.
1469 /* Send the REKEY_DONE to indicate we will take new keys into use
1471 silc_server_packet_send(server, ctx->sock, SILC_PACKET_REKEY_DONE,
1474 /* After we send REKEY_DONE we must set the sending encryption
1475 key to the new key since all packets after this packet must
1476 encrypted with the new key. */
1477 silc_server_protocol_rekey_generate(server, ctx, TRUE);
1479 /* The protocol ends in next stage. */
1480 protocol->state = SILC_PROTOCOL_STATE_END;
1488 * Second state, used only when oding re-key with PFS.
1490 if (ctx->responder == TRUE) {
1491 if (ctx->pfs == TRUE) {
1493 * Send our KE packe to the initiator now that we've processed
1494 * the initiator's KE packet.
1496 status = silc_ske_responder_finish(ctx->ske, NULL, NULL,
1497 SILC_SKE_PK_TYPE_SILC);
1498 if (status != SILC_SKE_STATUS_OK) {
1499 SILC_LOG_WARNING(("Error (%s) during Re-key (PFS)",
1500 silc_ske_map_status(status)));
1502 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1503 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1509 if (ctx->pfs == TRUE) {
1511 * The packet type must be KE packet
1513 if (ctx->packet->type != SILC_PACKET_KEY_EXCHANGE_2) {
1514 /* Error in protocol */
1515 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1516 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1520 status = silc_ske_initiator_finish(ctx->ske, ctx->packet->buffer);
1521 if (status != SILC_SKE_STATUS_OK) {
1522 SILC_LOG_WARNING(("Error (%s) during Re-key (PFS)",
1523 silc_ske_map_status(status)));
1525 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1526 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1532 /* Send the REKEY_DONE to indicate we will take new keys into use
1534 silc_server_packet_send(server, ctx->sock, SILC_PACKET_REKEY_DONE,
1537 /* After we send REKEY_DONE we must set the sending encryption
1538 key to the new key since all packets after this packet must
1539 encrypted with the new key. */
1540 silc_server_protocol_rekey_generate_pfs(server, ctx, TRUE);
1542 /* The protocol ends in next stage. */
1543 protocol->state = SILC_PROTOCOL_STATE_END;
1546 case SILC_PROTOCOL_STATE_END:
1551 if (ctx->packet->type != SILC_PACKET_REKEY_DONE) {
1552 /* Error in protocol */
1553 protocol->state = SILC_PROTOCOL_STATE_ERROR;
1554 silc_protocol_execute(protocol, server->schedule, 0, 300000);
1558 /* We received the REKEY_DONE packet and all packets after this is
1559 encrypted with the new key so set the decryption key to the new key */
1560 silc_server_protocol_rekey_generate(server, ctx, FALSE);
1562 /* Assure that after calling final callback there cannot be pending
1563 executions for this protocol anymore. This just unregisters any
1564 timeout callbacks for this protocol. */
1565 silc_protocol_cancel(protocol, server->schedule);
1567 /* Protocol has ended, call the final callback */
1568 if (protocol->final_callback)
1569 silc_protocol_execute_final(protocol, server->schedule);
1571 silc_protocol_free(protocol);
1574 case SILC_PROTOCOL_STATE_ERROR:
1579 if (ctx->pfs == TRUE) {
1580 /* Send abort notification */
1581 silc_ske_abort(ctx->ske, ctx->ske->status);
1584 /* Assure that after calling final callback there cannot be pending
1585 executions for this protocol anymore. This just unregisters any
1586 timeout callbacks for this protocol. */
1587 silc_protocol_cancel(protocol, server->schedule);
1589 /* On error the final callback is always called. */
1590 if (protocol->final_callback)
1591 silc_protocol_execute_final(protocol, server->schedule);
1593 silc_protocol_free(protocol);
1596 case SILC_PROTOCOL_STATE_FAILURE:
1598 * We have received failure from remote
1601 /* Assure that after calling final callback there cannot be pending
1602 executions for this protocol anymore. This just unregisters any
1603 timeout callbacks for this protocol. */
1604 silc_protocol_cancel(protocol, server->schedule);
1606 /* On error the final callback is always called. */
1607 if (protocol->final_callback)
1608 silc_protocol_execute_final(protocol, server->schedule);
1610 silc_protocol_free(protocol);
1613 case SILC_PROTOCOL_STATE_UNKNOWN:
1619 /* Registers protocols used in server. */
1621 void silc_server_protocols_register(void)
1623 silc_protocol_register(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1624 silc_server_protocol_connection_auth);
1625 silc_protocol_register(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1626 silc_server_protocol_key_exchange);
1627 silc_protocol_register(SILC_PROTOCOL_SERVER_REKEY,
1628 silc_server_protocol_rekey);
1629 silc_protocol_register(SILC_PROTOCOL_SERVER_BACKUP,
1630 silc_server_protocol_backup);
1633 /* Unregisters protocols */
1635 void silc_server_protocols_unregister(void)
1637 silc_protocol_unregister(SILC_PROTOCOL_SERVER_CONNECTION_AUTH,
1638 silc_server_protocol_connection_auth);
1639 silc_protocol_unregister(SILC_PROTOCOL_SERVER_KEY_EXCHANGE,
1640 silc_server_protocol_key_exchange);
1641 silc_protocol_unregister(SILC_PROTOCOL_SERVER_REKEY,
1642 silc_server_protocol_rekey);
1643 silc_protocol_unregister(SILC_PROTOCOL_SERVER_BACKUP,
1644 silc_server_protocol_backup);