lib/silcclient/client_connect.c

   1 /*
   2
   3   client_st_connect.c
   4
   5   Author: Pekka Riikonen <priikone@silcnet.org>
   6
   7   Copyright (C) 2006 - 2007 Pekka Riikonen
   8
   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; version 2 of the License.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18 */
  19
  20 #include "silc.h"
  21 #include "silcclient.h"
  22 #include "client_internal.h"
  23
  24 /************************ Static utility functions **************************/
  25
  26 /* Callback called after connected to remote host */
  27
  28 static void silc_client_connect_callback(SilcNetStatus status,
  29                                          SilcStream stream, void *context)
  30 {
  31   SilcFSMThread fsm = context;
  32   SilcClientConnection conn = silc_fsm_get_context(fsm);
  33   SilcClient client = conn->client;
  34
  35   conn->internal->op = NULL;
  36   if (conn->internal->verbose) {
  37     switch (status) {
  38     case SILC_NET_OK:
  39       break;
  40     case SILC_NET_UNKNOWN_IP:
  41       client->internal->ops->say(
  42                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  43                    "Could not connect to host %s: unknown IP address",
  44                    conn->remote_host);
  45       break;
  46     case SILC_NET_UNKNOWN_HOST:
  47       client->internal->ops->say(
  48                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  49                    "Could not connect to host %s: unknown host name",
  50                    conn->remote_host);
  51       break;
  52     case SILC_NET_HOST_UNREACHABLE:
  53       client->internal->ops->say(
  54                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  55                    "Could not connect to host %s: network unreachable",
  56                    conn->remote_host);
  57       break;
  58     case SILC_NET_CONNECTION_REFUSED:
  59       client->internal->ops->say(
  60                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  61                    "Could not connect to host %s: connection refused",
  62                    conn->remote_host);
  63       break;
  64     case SILC_NET_CONNECTION_TIMEOUT:
  65       client->internal->ops->say(
  66                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  67                    "Could not connect to host %s: connection timeout",
  68                    conn->remote_host);
  69       break;
  70     default:
  71       client->internal->ops->say(
  72                    client, conn, SILC_CLIENT_MESSAGE_ERROR,
  73                    "Could not connect to host %s",
  74                    conn->remote_host);
  75       break;
  76     }
  77   }
  78
  79   if (status != SILC_NET_OK) {
  80     /* Notify application of failure */
  81     SILC_LOG_DEBUG(("Connecting failed"));
  82     conn->internal->status = SILC_CLIENT_CONN_ERROR;
  83     silc_fsm_next(fsm, silc_client_st_connect_error);
  84     SILC_FSM_CALL_CONTINUE(fsm);
  85     return;
  86   }
  87
  88   /* Connection created successfully */
  89   SILC_LOG_DEBUG(("Connected"));
  90   conn->internal->user_stream = stream;
  91   SILC_FSM_CALL_CONTINUE(fsm);
  92 }
  93
  94 /* Called after application has verified remote host's public key */
  95
  96 static void silc_client_ke_verify_key_cb(SilcBool success, void *context)
  97 {
  98   SilcVerifyKeyContext verify = context;
  99
 100   SILC_LOG_DEBUG(("Start"));
 101
 102   /* Call the completion callback back to the SKE */
 103   verify->completion(verify->ske, success ? SILC_SKE_STATUS_OK :
 104                      SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 105                      verify->completion_context);
 106
 107   silc_free(verify);
 108 }
 109
 110 /* Verify remote host's public key */
 111
 112 static void silc_client_ke_verify_key(SilcSKE ske,
 113                                       SilcPublicKey public_key,
 114                                       void *context,
 115                                       SilcSKEVerifyCbCompletion completion,
 116                                       void *completion_context)
 117 {
 118   SilcFSMThread fsm = context;
 119   SilcClientConnection conn = silc_fsm_get_context(fsm);
 120   SilcClient client = conn->client;
 121   SilcVerifyKeyContext verify;
 122
 123   /* If we provided repository for SKE and we got here the key was not
 124      found from the repository. */
 125   if (conn->internal->params.repository &&
 126       !conn->internal->params.verify_notfound) {
 127     completion(ske, SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 128                completion_context);
 129     return;
 130   }
 131
 132   SILC_LOG_DEBUG(("Verify remote public key"));
 133
 134   verify = silc_calloc(1, sizeof(*verify));
 135   if (!verify) {
 136     completion(ske, SILC_SKE_STATUS_UNSUPPORTED_PUBLIC_KEY,
 137                completion_context);
 138     return;
 139   }
 140   verify->ske = ske;
 141   verify->completion = completion;
 142   verify->completion_context = completion_context;
 143
 144   /* Verify public key in application */
 145   client->internal->ops->verify_public_key(client, conn,
 146                                            conn->type, public_key,
 147                                            silc_client_ke_verify_key_cb,
 148                                            verify);
 149 }
 150
 151 /* Key exchange protocol completion callback */
 152
 153 static void silc_client_ke_completion(SilcSKE ske,
 154                                       SilcSKEStatus status,
 155                                       SilcSKESecurityProperties prop,
 156                                       SilcSKEKeyMaterial keymat,
 157                                       SilcSKERekeyMaterial rekey,
 158                                       void *context)
 159 {
 160   SilcFSMThread fsm = context;
 161   SilcClientConnection conn = silc_fsm_get_context(fsm);
 162   SilcClient client = conn->client;
 163   SilcCipher send_key, receive_key;
 164   SilcHmac hmac_send, hmac_receive;
 165
 166   conn->internal->op = NULL;
 167   if (status != SILC_SKE_STATUS_OK) {
 168     /* Key exchange failed */
 169     SILC_LOG_DEBUG(("Error during key exchange with %s: %s (%d)",
 170                     conn->remote_host, silc_ske_map_status(status), status));
 171
 172     if (conn->internal->verbose)
 173       client->internal->ops->say(client, conn, SILC_CLIENT_MESSAGE_ERROR,
 174                                  "Error during key exchange with %s: %s",
 175                                  conn->remote_host,
 176                                  silc_ske_map_status(status));
 177
 178     conn->internal->status = SILC_CLIENT_CONN_ERROR_KE;
 179     silc_ske_free_rekey_material(rekey);
 180
 181     silc_fsm_next(fsm, silc_client_st_connect_error);
 182     SILC_FSM_CALL_CONTINUE_SYNC(fsm);
 183     return;
 184   }
 185
 186   SILC_LOG_DEBUG(("Setting keys into use"));
 187
 188   /* Allocate the cipher and HMAC contexts */
 189   if (!silc_ske_set_keys(ske, keymat, prop, &send_key, &receive_key,
 190                          &hmac_send, &hmac_receive, &conn->internal->hash)) {
 191     /* Error setting keys */
 192     SILC_LOG_DEBUG(("Could not set keys into use"));
 193
 194     if (conn->internal->verbose)
 195       client->internal->ops->say(
 196                        client, conn, SILC_CLIENT_MESSAGE_ERROR,
 197                        "Error during key exchange with %s: cannot use keys",
 198                        conn->remote_host);
 199
 200     conn->internal->status = SILC_CLIENT_CONN_ERROR_KE;
 201     silc_ske_free_rekey_material(rekey);
 202
 203     silc_fsm_next(fsm, silc_client_st_connect_error);
 204     SILC_FSM_CALL_CONTINUE_SYNC(fsm);
 205     return;
 206   }
 207
 208   /* Set the keys into the packet stream.  After this call packets will be
 209      encrypted with these keys. */
 210   if (!silc_packet_set_keys(conn->stream, send_key, receive_key, hmac_send,
 211                             hmac_receive, FALSE)) {
 212     /* Error setting keys */
 213     SILC_LOG_DEBUG(("Could not set keys into use"));
 214
 215     if (conn->internal->verbose)
 216       client->internal->ops->say(
 217                        client, conn, SILC_CLIENT_MESSAGE_ERROR,
 218                        "Error during key exchange with %s: cannot use keys",
 219                        conn->remote_host);
 220
 221     conn->internal->status = SILC_CLIENT_CONN_ERROR_KE;
 222     silc_ske_free_rekey_material(rekey);
 223
 224     silc_fsm_next(fsm, silc_client_st_connect_error);
 225     SILC_FSM_CALL_CONTINUE_SYNC(fsm);
 226     return;
 227   }
 228
 229   conn->internal->rekey = rekey;
 230
 231   SILC_LOG_DEBUG(("Key Exchange completed"));
 232
 233   /* Key exchange done */
 234   SILC_FSM_CALL_CONTINUE_SYNC(fsm);
 235 }
 236
 237 /* Rekey protocol completion callback */
 238
 239 static void silc_client_rekey_completion(SilcSKE ske,
 240                                          SilcSKEStatus status,
 241                                          SilcSKESecurityProperties prop,
 242                                          SilcSKEKeyMaterial keymat,
 243                                          SilcSKERekeyMaterial rekey,
 244                                          void *context)
 245 {
 246   SilcFSMThread fsm = context;
 247   SilcClientConnection conn = silc_fsm_get_context(fsm);
 248   SilcClient client = conn->client;
 249
 250   conn->internal->op = NULL;
 251   if (status != SILC_SKE_STATUS_OK) {
 252     /* Rekey failed */
 253     SILC_LOG_DEBUG(("Error during rekey with %s: %s (%d)",
 254                     conn->remote_host, silc_ske_map_status(status), status));
 255
 256     if (conn->internal->verbose)
 257       client->internal->ops->say(client, conn, SILC_CLIENT_MESSAGE_ERROR,
 258                                  "Error during rekey with %s: %s",
 259                                  conn->remote_host,
 260                                  silc_ske_map_status(status));
 261
 262     silc_ske_free(conn->internal->ske);
 263     conn->internal->ske = NULL;
 264     silc_fsm_finish(fsm);
 265     return;
 266   }
 267
 268   silc_ske_free_rekey_material(conn->internal->rekey);
 269   conn->internal->rekey = rekey;
 270
 271   silc_ske_free(conn->internal->ske);
 272   conn->internal->ske = NULL;
 273
 274   SILC_LOG_DEBUG(("Rekey completed conn %p", conn));
 275
 276   /* Rekey done */
 277   silc_fsm_finish(fsm);
 278 }
 279
 280 /* Callback called by application to return authentication data */
 281
 282 static void silc_client_connect_auth_method(SilcAuthMethod auth_meth,
 283                                             void *auth, SilcUInt32 auth_len,
 284                                             void *context)
 285 {
 286   SilcFSMThread fsm = context;
 287   SilcClientConnection conn = silc_fsm_get_context(fsm);
 288
 289   conn->internal->params.auth_method = auth_meth;
 290   conn->internal->params.auth = auth;
 291   conn->internal->params.auth_len = auth_len;
 292
 293   SILC_FSM_CALL_CONTINUE(fsm);
 294 }
 295
 296 /* Connection authentication completion callback */
 297
 298 static void silc_client_connect_auth_completion(SilcConnAuth connauth,
 299                                                 SilcBool success,
 300                                                 void *context)
 301 {
 302   SilcFSMThread fsm = context;
 303   SilcClientConnection conn = silc_fsm_get_context(fsm);
 304   SilcClient client = conn->client;
 305
 306   conn->internal->op = NULL;
 307   silc_connauth_free(connauth);
 308
 309   if (!success) {
 310     if (conn->internal->verbose)
 311         client->internal->ops->say(
 312                         client, conn, SILC_CLIENT_MESSAGE_ERROR,
 313                         "Authentication failed");
 314
 315     conn->internal->status = SILC_CLIENT_CONN_ERROR_AUTH;
 316     conn->internal->error = SILC_STATUS_ERR_AUTH_FAILED;
 317     silc_fsm_next(fsm, silc_client_st_connect_error);
 318   }
 319
 320   SILC_FSM_CALL_CONTINUE_SYNC(fsm);
 321 }
 322
 323 /********************** CONNECTION_AUTH_REQUEST packet **********************/
 324
 325 /* Received connection authentication request packet.  We get the
 326    required authentication method here. */
 327
 328 SILC_FSM_STATE(silc_client_connect_auth_request)
 329 {
 330   SilcClientConnection conn = fsm_context;
 331   SilcPacket packet = state_context;
 332   SilcUInt16 conn_type, auth_meth;
 333
 334   if (!conn->internal->auth_request) {
 335     silc_packet_free(packet);
 336     return SILC_FSM_FINISH;
 337   }
 338
 339   /* Parse the payload */
 340   if (silc_buffer_unformat(&packet->buffer,
 341                            SILC_STR_UI_SHORT(&conn_type),
 342                            SILC_STR_UI_SHORT(&auth_meth),
 343                            SILC_STR_END) < 0)
 344     auth_meth = SILC_AUTH_NONE;
 345
 346   silc_packet_free(packet);
 347
 348   SILC_LOG_DEBUG(("Resolved authentication method: %s",
 349                   (auth_meth == SILC_AUTH_NONE ? "none" :
 350                    auth_meth == SILC_AUTH_PASSWORD ? "passphrase" :
 351                    "public key")));
 352   conn->internal->params.auth_method = auth_meth;
 353
 354   /* Continue authentication */
 355   silc_fsm_continue_sync(&conn->internal->event_thread);
 356   return SILC_FSM_FINISH;
 357 }
 358
 359 /*************************** Connect remote host ****************************/
 360
 361 /* Connection timeout callback */
 362
 363 SILC_TASK_CALLBACK(silc_client_connect_timeout)
 364 {
 365   SilcClientConnection conn = context;
 366
 367   SILC_LOG_DEBUG(("Connection timeout"));
 368
 369   conn->internal->status = SILC_CLIENT_CONN_ERROR_TIMEOUT;
 370   conn->internal->error = SILC_STATUS_ERR_TIMEDOUT;
 371
 372   silc_fsm_next(&conn->internal->event_thread, silc_client_st_connect_error);
 373   silc_fsm_continue_sync(&conn->internal->event_thread);
 374 }
 375
 376 /* Creates a connection to remote host */
 377
 378 SILC_FSM_STATE(silc_client_st_connect)
 379 {
 380   SilcClientConnection conn = fsm_context;
 381
 382   SILC_LOG_DEBUG(("Connecting to %s:%d", conn->remote_host,
 383                   conn->remote_port));
 384
 385   /** Connect */
 386   silc_fsm_next(fsm, silc_client_st_connect_set_stream);
 387
 388   /* Add connection timeout */
 389   if (conn->internal->params.timeout_secs)
 390     silc_schedule_task_add_timeout(conn->internal->schedule,
 391                                    silc_client_connect_timeout, conn,
 392                                    conn->internal->params.timeout_secs, 0);
 393
 394   if (conn->internal->params.udp) {
 395     SilcStream stream;
 396
 397     if (!conn->internal->params.local_ip) {
 398       /** IP address not given */
 399       SILC_LOG_ERROR(("Local UDP IP address not specified"));
 400       conn->internal->status = SILC_CLIENT_CONN_ERROR;
 401       silc_fsm_next(fsm, silc_client_st_connect_error);
 402       return SILC_FSM_CONTINUE;
 403     }
 404
 405     /* Connect (UDP) */
 406     stream = silc_net_udp_connect(conn->internal->params.bind_ip ?
 407                                   conn->internal->params.bind_ip :
 408                                   conn->internal->params.local_ip,
 409                                   conn->internal->params.local_port,
 410                                   conn->remote_host, conn->remote_port,
 411                                   conn->internal->schedule);
 412
 413     SILC_FSM_CALL(silc_client_connect_callback(stream ? SILC_NET_OK :
 414                                                SILC_NET_HOST_UNREACHABLE,
 415                                                stream, fsm));
 416   } else {
 417     /* Connect (TCP) */
 418     SILC_FSM_CALL(conn->internal->op = silc_net_tcp_connect(
 419                                        NULL, conn->remote_host,
 420                                        conn->remote_port,
 421                                        conn->internal->schedule,
 422                                        silc_client_connect_callback, fsm));
 423   }
 424 }
 425
 426 /* Sets the new connection stream into use and creates packet stream */
 427
 428 SILC_FSM_STATE(silc_client_st_connect_set_stream)
 429 {
 430   SilcClientConnection conn = fsm_context;
 431   SilcClient client = conn->client;
 432
 433   if (conn->internal->disconnected) {
 434     /** Disconnected */
 435     silc_fsm_next(fsm, silc_client_st_connect_error);
 436     return SILC_FSM_CONTINUE;
 437   }
 438
 439   /* Create packet stream */
 440   conn->stream = silc_packet_stream_create(client->internal->packet_engine,
 441                                            conn->internal->schedule,
 442                                            conn->internal->user_stream);
 443   if (!conn->stream) {
 444     /** Cannot create packet stream */
 445     SILC_LOG_DEBUG(("Could not create packet stream"));
 446     conn->internal->status = SILC_CLIENT_CONN_ERROR;
 447     silc_fsm_next(fsm, silc_client_st_connect_error);
 448     return SILC_FSM_CONTINUE;
 449   }
 450
 451   silc_packet_set_context(conn->stream, conn);
 452
 453   /** Start key exchange */
 454   silc_fsm_next(fsm, silc_client_st_connect_key_exchange);
 455   return SILC_FSM_CONTINUE;
 456 }
 457
 458 /* Starts key exchange protocol with remote host */
 459
 460 SILC_FSM_STATE(silc_client_st_connect_key_exchange)
 461 {
 462   SilcClientConnection conn = fsm_context;
 463   SilcClient client = conn->client;
 464   SilcSKEParamsStruct params;
 465   SilcClientID cid;
 466
 467   SILC_LOG_DEBUG(("Starting key exchange protocol"));
 468
 469   /* Allocate SKE */
 470   conn->internal->ske =
 471     silc_ske_alloc(client->rng, conn->internal->schedule,
 472                    conn->internal->params.repository,
 473                    conn->public_key, conn->private_key, fsm);
 474   if (!conn->internal->ske) {
 475     /** Out of memory */
 476     conn->internal->status = SILC_CLIENT_CONN_ERROR_KE;
 477     silc_fsm_next(fsm, silc_client_st_connect_error);
 478     return SILC_FSM_CONTINUE;
 479   }
 480
 481   /* Set SKE callbacks */
 482   silc_ske_set_callbacks(conn->internal->ske, silc_client_ke_verify_key,
 483                          silc_client_ke_completion, fsm);
 484
 485   /* Set up key exchange parameters */
 486   params.version = client->internal->silc_client_version;
 487   params.timeout_secs = conn->internal->params.timeout_secs;
 488   params.flags = SILC_SKE_SP_FLAG_MUTUAL;
 489   if (conn->internal->params.pfs)
 490     params.flags |= SILC_SKE_SP_FLAG_PFS;
 491   if (conn->internal->params.udp) {
 492     params.flags |= SILC_SKE_SP_FLAG_IV_INCLUDED;
 493     params.session_port = conn->internal->params.local_port;
 494   }
 495
 496   if (conn->internal->params.no_authentication)
 497     /** Run key exchange (no auth) */
 498     silc_fsm_next(fsm, silc_client_st_connected);
 499   else if (conn->internal->params.udp)
 500     /** Run key exchange (UDP)*/
 501     silc_fsm_next(fsm, silc_client_st_connect_setup_udp);
 502   else
 503     /** Run key exchange (TCP) */
 504     silc_fsm_next(fsm, silc_client_st_connect_auth_resolve);
 505
 506   /* Old server version requires empty Client ID in packets.  Remove this
 507      backwards support somepoint after 1.1 server is released. */
 508   memset(&cid, 0, sizeof(cid));
 509   cid.ip.data_len = 4;
 510   silc_packet_set_ids(conn->stream, SILC_ID_CLIENT, &cid, 0, NULL);
 511
 512   SILC_FSM_CALL(conn->internal->op = silc_ske_initiator(conn->internal->ske,
 513                                                         conn->stream,
 514                                                         &params, NULL));
 515 }
 516
 517 /* For UDP/IP connections, set up the UDP session after successful key
 518    exchange protocol */
 519
 520 SILC_FSM_STATE(silc_client_st_connect_setup_udp)
 521 {
 522   SilcClientConnection conn = fsm_context;
 523   SilcStream stream, old;
 524   SilcSKESecurityProperties prop;
 525
 526   SILC_LOG_DEBUG(("Setup UDP SILC session"));
 527
 528   if (conn->internal->disconnected) {
 529     /** Disconnected */
 530     silc_fsm_next(fsm, silc_client_st_connect_error);
 531     return SILC_FSM_CONTINUE;
 532   }
 533
 534   /* Create new UDP stream */
 535   prop = silc_ske_get_security_properties(conn->internal->ske);
 536   stream = silc_net_udp_connect(conn->internal->params.local_ip,
 537                                 conn->internal->params.local_port,
 538                                 conn->remote_host, prop->remote_port,
 539                                 conn->internal->schedule);
 540   if (!stream) {
 541     /** Cannot create UDP stream */
 542     conn->internal->status = SILC_CLIENT_CONN_ERROR;
 543     silc_fsm_next(fsm, silc_client_st_connect_error);
 544     return SILC_FSM_CONTINUE;
 545   }
 546
 547   /* Set the new stream to packet stream */
 548   old = silc_packet_stream_get_stream(conn->stream);
 549   silc_packet_stream_set_stream(conn->stream, stream);
 550   silc_packet_stream_set_iv_included(conn->stream);
 551   silc_packet_set_sid(conn->stream, 0);
 552
 553   /* Delete the old stream */
 554   silc_stream_destroy(old);
 555
 556   /** Start authentication */
 557   silc_fsm_next(fsm, silc_client_st_connect_auth_resolve);
 558   return SILC_FSM_CONTINUE;
 559 }
 560
 561 /* Resolve authentication method to be used in authentication protocol */
 562
 563 SILC_FSM_STATE(silc_client_st_connect_auth_resolve)
 564 {
 565   SilcClientConnection conn = fsm_context;
 566
 567   SILC_LOG_DEBUG(("Resolve authentication method"));
 568
 569   if (conn->internal->disconnected) {
 570     /** Disconnected */
 571     silc_fsm_next(fsm, silc_client_st_connect_error);
 572     return SILC_FSM_CONTINUE;
 573   }
 574
 575   /* If authentication method and data is set, use them */
 576   if (conn->internal->params.auth_set) {
 577     /** Got authentication data */
 578     silc_fsm_next(fsm, silc_client_st_connect_auth_start);
 579     return SILC_FSM_CONTINUE;
 580   }
 581
 582   /* Send connection authentication request packet */
 583   silc_packet_send_va(conn->stream,
 584                       SILC_PACKET_CONNECTION_AUTH_REQUEST, 0,
 585                       SILC_STR_UI_SHORT(SILC_CONN_CLIENT),
 586                       SILC_STR_UI_SHORT(SILC_AUTH_NONE),
 587                       SILC_STR_END);
 588
 589   /** Wait for authentication method */
 590   conn->internal->auth_request = TRUE;
 591   conn->internal->params.auth_method = SILC_AUTH_NONE;
 592   silc_fsm_next_later(fsm, silc_client_st_connect_auth_data, 2, 0);
 593   return SILC_FSM_WAIT;
 594 }
 595
 596 /* Get authentication data to be used in authentication protocol */
 597
 598 SILC_FSM_STATE(silc_client_st_connect_auth_data)
 599 {
 600   SilcClientConnection conn = fsm_context;
 601   SilcClient client = conn->client;
 602
 603   SILC_LOG_DEBUG(("Get authentication data"));
 604
 605   if (conn->internal->disconnected) {
 606     /** Disconnected */
 607     silc_fsm_next(fsm, silc_client_st_connect_error);
 608     return SILC_FSM_CONTINUE;
 609   }
 610
 611   conn->internal->auth_request = FALSE;
 612
 613   /** Get authentication data */
 614   silc_fsm_next(fsm, silc_client_st_connect_auth_start);
 615   SILC_FSM_CALL(client->internal->ops->get_auth_method(
 616                                     client, conn,
 617                                     conn->remote_host,
 618                                     conn->remote_port,
 619                                     conn->internal->params.auth_method,
 620                                     silc_client_connect_auth_method, fsm));
 621 }
 622
 623 /* Start connection authentication with remote host */
 624
 625 SILC_FSM_STATE(silc_client_st_connect_auth_start)
 626 {
 627   SilcClientConnection conn = fsm_context;
 628   SilcConnAuth connauth;
 629
 630   SILC_LOG_DEBUG(("Starting connection authentication protocol"));
 631
 632   if (conn->internal->disconnected) {
 633     /** Disconnected */
 634     silc_fsm_next(fsm, silc_client_st_connect_error);
 635     return SILC_FSM_CONTINUE;
 636   }
 637
 638   /* We always use the same key for connection authentication and SKE */
 639   if (conn->internal->params.auth_method == SILC_AUTH_PUBLIC_KEY)
 640     conn->internal->params.auth = conn->private_key;
 641
 642   /* Allocate connection authentication protocol */
 643   connauth = silc_connauth_alloc(conn->internal->schedule,
 644                                  conn->internal->ske,
 645                                  conn->internal->params.rekey_secs);
 646   if (!connauth) {
 647     /** Out of memory */
 648     conn->internal->status = SILC_CLIENT_CONN_ERROR_AUTH;
 649     conn->internal->error = SILC_STATUS_ERR_AUTH_FAILED;
 650     silc_fsm_next(fsm, silc_client_st_connect_error);
 651     return SILC_FSM_CONTINUE;
 652   }
 653
 654   /** Start connection authentication */
 655   silc_fsm_next(fsm, silc_client_st_connected);
 656   SILC_FSM_CALL(conn->internal->op = silc_connauth_initiator(
 657                                         connauth, SILC_CONN_CLIENT,
 658                                         conn->internal->params.auth_method,
 659                                         conn->internal->params.auth,
 660                                         conn->internal->params.auth_len,
 661                                         silc_client_connect_auth_completion,
 662                                         fsm));
 663 }
 664
 665 /* Connection fully established */
 666
 667 SILC_FSM_STATE(silc_client_st_connected)
 668 {
 669   SilcClientConnection conn = fsm_context;
 670   SilcClient client = conn->client;
 671
 672   /* Get SILC protocol version remote supports */
 673   silc_ske_parse_version(conn->internal->ske, &conn->internal->remote_version,
 674                          NULL, NULL, NULL, NULL);
 675
 676   silc_ske_free(conn->internal->ske);
 677   conn->internal->ske = NULL;
 678
 679   if (conn->internal->disconnected) {
 680     /** Disconnected */
 681     silc_fsm_next(fsm, silc_client_st_connect_error);
 682     return SILC_FSM_CONTINUE;
 683   }
 684
 685   SILC_LOG_DEBUG(("Connection established"));
 686
 687   /* Install rekey timer */
 688   if (conn->type != SILC_CONN_CLIENT)
 689     silc_schedule_task_add_timeout(conn->internal->schedule,
 690                                    silc_client_rekey_timer, conn,
 691                                    conn->internal->params.rekey_secs, 0);
 692
 693   /* If we connected to server, now register to network. */
 694   if (conn->type == SILC_CONN_SERVER &&
 695       !conn->internal->params.no_authentication) {
 696
 697     /* If detach data is provided, resume the session. */
 698     if (conn->internal->params.detach_data &&
 699         conn->internal->params.detach_data_len) {
 700       /** Resume detached session */
 701       silc_fsm_next(fsm, silc_client_st_resume);
 702     } else {
 703       /** Register to network */
 704       silc_fsm_next(fsm, silc_client_st_register);
 705     }
 706
 707     return SILC_FSM_CONTINUE;
 708   }
 709
 710   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 711                                 silc_client_connect_timeout, conn);
 712
 713   /* Call connection callback */
 714   conn->callback(client, conn, SILC_CLIENT_CONN_SUCCESS, 0, NULL,
 715                  conn->callback_context);
 716
 717   silc_async_free(conn->internal->cop);
 718   conn->internal->cop = NULL;
 719
 720   return SILC_FSM_FINISH;
 721 }
 722
 723 /* Error during connecting */
 724
 725 SILC_FSM_STATE(silc_client_st_connect_error)
 726 {
 727   SilcClientConnection conn = fsm_context;
 728
 729   if (conn->internal->ske) {
 730     silc_ske_free(conn->internal->ske);
 731     conn->internal->ske = NULL;
 732   }
 733
 734   /* Signal to close connection */
 735   if (!conn->internal->disconnected) {
 736     conn->internal->disconnected = TRUE;
 737     SILC_FSM_EVENT_SIGNAL(&conn->internal->wait_event);
 738   }
 739
 740   silc_schedule_task_del_by_all(conn->internal->schedule, 0,
 741                                 silc_client_connect_timeout, conn);
 742
 743   return SILC_FSM_FINISH;
 744 }
 745
 746 /****************************** Connect rekey *******************************/
 747
 748 /* Connection rekey timer callback */
 749
 750 SILC_TASK_CALLBACK(silc_client_rekey_timer)
 751 {
 752   SilcClientConnection conn = context;
 753
 754   /* Signal to start rekey */
 755   if (!silc_fsm_is_started(&conn->internal->event_thread)) {
 756     conn->internal->rekey_responder = FALSE;
 757     conn->internal->rekeying = TRUE;
 758     SILC_FSM_EVENT_SIGNAL(&conn->internal->wait_event);
 759   }
 760
 761   /* Reinstall rekey timer */
 762   silc_schedule_task_add_timeout(conn->internal->schedule,
 763                                  silc_client_rekey_timer, conn,
 764                                  conn->internal->params.rekey_secs, 0);
 765 }
 766
 767 /* Performs rekey */
 768
 769 SILC_FSM_STATE(silc_client_st_rekey)
 770 {
 771   SilcClientConnection conn = fsm_context;
 772   SilcClient client = conn->client;
 773
 774   SILC_LOG_DEBUG(("Rekey conn %p", conn));
 775
 776   if (conn->internal->disconnected)
 777     return SILC_FSM_FINISH;
 778
 779   /* Allocate SKE */
 780   conn->internal->ske =
 781     silc_ske_alloc(client->rng, conn->internal->schedule,
 782                    conn->internal->params.repository,
 783                    conn->public_key, conn->private_key, fsm);
 784   if (!conn->internal->ske)
 785     return SILC_FSM_FINISH;
 786
 787   /* Set SKE callbacks */
 788   silc_ske_set_callbacks(conn->internal->ske, NULL,
 789                          silc_client_rekey_completion, fsm);
 790
 791   /** Perform rekey */
 792   if (!conn->internal->rekey_responder)
 793     SILC_FSM_CALL(conn->internal->op = silc_ske_rekey_initiator(
 794                                                     conn->internal->ske,
 795                                                     conn->stream,
 796                                                     conn->internal->rekey));
 797   else
 798     SILC_FSM_CALL(conn->internal->op = silc_ske_rekey_responder(
 799                                                     conn->internal->ske,
 800                                                     conn->stream,
 801                                                     conn->internal->rekey,
 802                                                     NULL));
 803 }