ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #include <openssl/bn.h>
 124 #ifndef OPENSSL_NO_DH
 125 # include <openssl/dh.h>
 126 #endif
 127
 128 static const SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver)
 132 {
 133     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 134         return (DTLSv1_client_method());
 135     else if (ver == DTLS1_2_VERSION)
 136         return (DTLSv1_2_client_method());
 137     else
 138         return (NULL);
 139 }
 140
 141 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 142                           DTLSv1_client_method,
 143                           ssl_undefined_function,
 144                           dtls1_connect,
 145                           dtls1_get_client_method, DTLSv1_enc_data)
 146
 147     IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 148                           DTLSv1_2_client_method,
 149                           ssl_undefined_function,
 150                           dtls1_connect,
 151                           dtls1_get_client_method, DTLSv1_2_enc_data)
 152
 153     IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 154                           DTLS_client_method,
 155                           ssl_undefined_function,
 156                           dtls1_connect,
 157                           dtls1_get_client_method, DTLSv1_2_enc_data)
 158
 159 int dtls1_connect(SSL *s)
 160 {
 161     BUF_MEM *buf = NULL;
 162     unsigned long Time = (unsigned long)time(NULL);
 163     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 164     int ret = -1;
 165     int new_state, state, skip = 0;
 166 #ifndef OPENSSL_NO_SCTP
 167     unsigned char sctpauthkey[64];
 168     char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 169 #endif
 170
 171     RAND_add(&Time, sizeof(Time), 0);
 172     ERR_clear_error();
 173     clear_sys_error();
 174
 175     if (s->info_callback != NULL)
 176         cb = s->info_callback;
 177     else if (s->ctx->info_callback != NULL)
 178         cb = s->ctx->info_callback;
 179
 180     s->in_handshake++;
 181     if (!SSL_in_init(s) || SSL_in_before(s)) {
 182         if (!SSL_clear(s))
 183             return -1;
 184     }
 185
 186 #ifndef OPENSSL_NO_SCTP
 187     /*
 188      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 189      * identifier other than 0. Will be ignored if no SCTP is used.
 190      */
 191     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 192              s->in_handshake, NULL);
 193 #endif
 194
 195 #ifndef OPENSSL_NO_HEARTBEATS
 196     /*
 197      * If we're awaiting a HeartbeatResponse, pretend we already got and
 198      * don't await it anymore, because Heartbeats don't make sense during
 199      * handshakes anyway.
 200      */
 201     if (s->tlsext_hb_pending) {
 202         dtls1_stop_timer(s);
 203         s->tlsext_hb_pending = 0;
 204         s->tlsext_hb_seq++;
 205     }
 206 #endif
 207
 208     for (;;) {
 209         state = s->state;
 210
 211         switch (s->state) {
 212         case SSL_ST_RENEGOTIATE:
 213             s->renegotiate = 1;
 214             s->state = SSL_ST_CONNECT;
 215             s->ctx->stats.sess_connect_renegotiate++;
 216             /* break */
 217         case SSL_ST_BEFORE:
 218         case SSL_ST_CONNECT:
 219         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 220         case SSL_ST_OK | SSL_ST_CONNECT:
 221
 222             s->server = 0;
 223             if (cb != NULL)
 224                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 225
 226             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 227                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 228                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 229                 ret = -1;
 230                 s->state = SSL_ST_ERR;
 231                 goto end;
 232             }
 233
 234             /* s->version=SSL3_VERSION; */
 235             s->type = SSL_ST_CONNECT;
 236
 237             if (s->init_buf == NULL) {
 238                 if ((buf = BUF_MEM_new()) == NULL) {
 239                     ret = -1;
 240                     s->state = SSL_ST_ERR;
 241                     goto end;
 242                 }
 243                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 244                     ret = -1;
 245                     s->state = SSL_ST_ERR;
 246                     goto end;
 247                 }
 248                 s->init_buf = buf;
 249                 buf = NULL;
 250             }
 251
 252             if (!ssl3_setup_buffers(s)) {
 253                 ret = -1;
 254                 s->state = SSL_ST_ERR;
 255                 goto end;
 256             }
 257
 258             /* setup buffing BIO */
 259             if (!ssl_init_wbio_buffer(s, 0)) {
 260                 ret = -1;
 261                 s->state = SSL_ST_ERR;
 262                 goto end;
 263             }
 264
 265             /* don't push the buffering BIO quite yet */
 266
 267             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 268             s->ctx->stats.sess_connect++;
 269             s->init_num = 0;
 270             /* mark client_random uninitialized */
 271             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 272             s->d1->send_cookie = 0;
 273             s->hit = 0;
 274             /*
 275              * Should have been reset by ssl3_get_finished, too.
 276              */
 277             s->s3->change_cipher_spec = 0;
 278             break;
 279
 280 #ifndef OPENSSL_NO_SCTP
 281         case DTLS1_SCTP_ST_CR_READ_SOCK:
 282
 283             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 284                 s->s3->in_read_app_data = 2;
 285                 s->rwstate = SSL_READING;
 286                 BIO_clear_retry_flags(SSL_get_rbio(s));
 287                 BIO_set_retry_read(SSL_get_rbio(s));
 288                 ret = -1;
 289                 goto end;
 290             }
 291
 292             s->state = s->s3->tmp.next_state;
 293             break;
 294
 295         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 296             /* read app data until dry event */
 297
 298             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 299             if (ret < 0)
 300                 goto end;
 301
 302             if (ret == 0) {
 303                 s->s3->in_read_app_data = 2;
 304                 s->rwstate = SSL_READING;
 305                 BIO_clear_retry_flags(SSL_get_rbio(s));
 306                 BIO_set_retry_read(SSL_get_rbio(s));
 307                 ret = -1;
 308                 goto end;
 309             }
 310
 311             s->state = s->d1->next_state;
 312             break;
 313 #endif
 314
 315         case SSL3_ST_CW_CLNT_HELLO_A:
 316         case SSL3_ST_CW_CLNT_HELLO_B:
 317
 318             s->shutdown = 0;
 319
 320             /* every DTLS ClientHello resets Finished MAC */
 321             ssl3_init_finished_mac(s);
 322
 323             dtls1_start_timer(s);
 324             ret = ssl3_client_hello(s);
 325             if (ret <= 0)
 326                 goto end;
 327
 328             if (s->d1->send_cookie) {
 329                 s->state = SSL3_ST_CW_FLUSH;
 330                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 331             } else
 332                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 333
 334             s->init_num = 0;
 335
 336 #ifndef OPENSSL_NO_SCTP
 337             /* Disable buffering for SCTP */
 338             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 339 #endif
 340                 /*
 341                  * turn on buffering for the next lot of output
 342                  */
 343                 if (s->bbio != s->wbio)
 344                     s->wbio = BIO_push(s->bbio, s->wbio);
 345 #ifndef OPENSSL_NO_SCTP
 346             }
 347 #endif
 348
 349             break;
 350
 351         case SSL3_ST_CR_SRVR_HELLO_A:
 352         case SSL3_ST_CR_SRVR_HELLO_B:
 353             ret = ssl3_get_server_hello(s);
 354             if (ret <= 0)
 355                 goto end;
 356             else {
 357                 if (s->hit) {
 358 #ifndef OPENSSL_NO_SCTP
 359                     /*
 360                      * Add new shared key for SCTP-Auth, will be ignored if
 361                      * no SCTP used.
 362                      */
 363                     snprintf((char *)labelbuffer,
 364                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 365                              DTLS1_SCTP_AUTH_LABEL);
 366
 367                     if (SSL_export_keying_material(s, sctpauthkey,
 368                                                sizeof(sctpauthkey),
 369                                                labelbuffer,
 370                                                sizeof(labelbuffer), NULL, 0,
 371                                                0) <= 0) {
 372                         ret = -1;
 373                         s->state = SSL_ST_ERR;
 374                         goto end;
 375                     }
 376
 377                     BIO_ctrl(SSL_get_wbio(s),
 378                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 379                              sizeof(sctpauthkey), sctpauthkey);
 380 #endif
 381
 382                     s->state = SSL3_ST_CR_CHANGE_A;
 383                     if (s->tlsext_ticket_expected) {
 384                         /* receive renewed session ticket */
 385                         s->state = SSL3_ST_CR_SESSION_TICKET_A;
 386                     }
 387                 } else
 388                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 389             }
 390             s->init_num = 0;
 391             break;
 392
 393         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 394         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 395
 396             ret = dtls1_get_hello_verify(s);
 397             if (ret <= 0)
 398                 goto end;
 399             dtls1_stop_timer(s);
 400             if (s->d1->send_cookie) /* start again, with a cookie */
 401                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 402             else
 403                 s->state = SSL3_ST_CR_CERT_A;
 404             s->init_num = 0;
 405             break;
 406
 407         case SSL3_ST_CR_CERT_A:
 408         case SSL3_ST_CR_CERT_B:
 409             /* Check if it is anon DH or PSK */
 410             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 411                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 412                 ret = ssl3_get_server_certificate(s);
 413                 if (ret <= 0)
 414                     goto end;
 415
 416                 if (s->tlsext_status_expected)
 417                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 418                 else
 419                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 420             } else {
 421                 skip = 1;
 422                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 423             }
 424
 425             s->init_num = 0;
 426             break;
 427
 428         case SSL3_ST_CR_KEY_EXCH_A:
 429         case SSL3_ST_CR_KEY_EXCH_B:
 430             ret = ssl3_get_key_exchange(s);
 431             if (ret <= 0)
 432                 goto end;
 433             s->state = SSL3_ST_CR_CERT_REQ_A;
 434             s->init_num = 0;
 435
 436             /*
 437              * at this point we check that we have the required stuff from
 438              * the server
 439              */
 440             if (!ssl3_check_cert_and_algorithm(s)) {
 441                 ret = -1;
 442                 s->state = SSL_ST_ERR;
 443                 goto end;
 444             }
 445             break;
 446
 447         case SSL3_ST_CR_CERT_REQ_A:
 448         case SSL3_ST_CR_CERT_REQ_B:
 449             ret = ssl3_get_certificate_request(s);
 450             if (ret <= 0)
 451                 goto end;
 452             s->state = SSL3_ST_CR_SRVR_DONE_A;
 453             s->init_num = 0;
 454             break;
 455
 456         case SSL3_ST_CR_SRVR_DONE_A:
 457         case SSL3_ST_CR_SRVR_DONE_B:
 458             ret = ssl3_get_server_done(s);
 459             if (ret <= 0)
 460                 goto end;
 461             dtls1_stop_timer(s);
 462             if (s->s3->tmp.cert_req)
 463                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 464             else
 465                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 466             s->init_num = 0;
 467
 468 #ifndef OPENSSL_NO_SCTP
 469             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 470                 state == SSL_ST_RENEGOTIATE)
 471                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 472             else
 473 #endif
 474                 s->state = s->s3->tmp.next_state;
 475             break;
 476
 477         case SSL3_ST_CW_CERT_A:
 478         case SSL3_ST_CW_CERT_B:
 479         case SSL3_ST_CW_CERT_C:
 480         case SSL3_ST_CW_CERT_D:
 481             dtls1_start_timer(s);
 482             ret = ssl3_send_client_certificate(s);
 483             if (ret <= 0)
 484                 goto end;
 485             s->state = SSL3_ST_CW_KEY_EXCH_A;
 486             s->init_num = 0;
 487             break;
 488
 489         case SSL3_ST_CW_KEY_EXCH_A:
 490         case SSL3_ST_CW_KEY_EXCH_B:
 491             dtls1_start_timer(s);
 492             ret = ssl3_send_client_key_exchange(s);
 493             if (ret <= 0)
 494                 goto end;
 495
 496 #ifndef OPENSSL_NO_SCTP
 497             /*
 498              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 499              * used.
 500              */
 501             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 502                      DTLS1_SCTP_AUTH_LABEL);
 503
 504             if (SSL_export_keying_material(s, sctpauthkey,
 505                                        sizeof(sctpauthkey), labelbuffer,
 506                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 507                 ret = -1;
 508                 s->state = SSL_ST_ERR;
 509                 goto end;
 510             }
 511
 512             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 513                      sizeof(sctpauthkey), sctpauthkey);
 514 #endif
 515
 516             /*
 517              * EAY EAY EAY need to check for DH fix cert sent back
 518              */
 519             /*
 520              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 521              * sent, but no verify packet is sent
 522              */
 523             if (s->s3->tmp.cert_req == 1) {
 524                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 525             } else {
 526 #ifndef OPENSSL_NO_SCTP
 527                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 528                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 529                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 530                 } else
 531 #endif
 532                     s->state = SSL3_ST_CW_CHANGE_A;
 533             }
 534
 535             s->init_num = 0;
 536             break;
 537
 538         case SSL3_ST_CW_CERT_VRFY_A:
 539         case SSL3_ST_CW_CERT_VRFY_B:
 540             dtls1_start_timer(s);
 541             ret = ssl3_send_client_verify(s);
 542             if (ret <= 0)
 543                 goto end;
 544 #ifndef OPENSSL_NO_SCTP
 545             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 546                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 547                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 548             } else
 549 #endif
 550                 s->state = SSL3_ST_CW_CHANGE_A;
 551             s->init_num = 0;
 552             break;
 553
 554         case SSL3_ST_CW_CHANGE_A:
 555         case SSL3_ST_CW_CHANGE_B:
 556             if (!s->hit)
 557                 dtls1_start_timer(s);
 558             ret = dtls1_send_change_cipher_spec(s,
 559                                                 SSL3_ST_CW_CHANGE_A,
 560                                                 SSL3_ST_CW_CHANGE_B);
 561             if (ret <= 0)
 562                 goto end;
 563
 564             s->state = SSL3_ST_CW_FINISHED_A;
 565             s->init_num = 0;
 566
 567             s->session->cipher = s->s3->tmp.new_cipher;
 568 #ifdef OPENSSL_NO_COMP
 569             s->session->compress_meth = 0;
 570 #else
 571             if (s->s3->tmp.new_compression == NULL)
 572                 s->session->compress_meth = 0;
 573             else
 574                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 575 #endif
 576             if (!s->method->ssl3_enc->setup_key_block(s)) {
 577                 ret = -1;
 578                 s->state = SSL_ST_ERR;
 579                 goto end;
 580             }
 581
 582             if (!s->method->ssl3_enc->change_cipher_state(s,
 583                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 584             {
 585                 ret = -1;
 586                 s->state = SSL_ST_ERR;
 587                 goto end;
 588             }
 589 #ifndef OPENSSL_NO_SCTP
 590             if (s->hit) {
 591                 /*
 592                  * Change to new shared key of SCTP-Auth, will be ignored if
 593                  * no SCTP used.
 594                  */
 595                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 596                          0, NULL);
 597             }
 598 #endif
 599
 600             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 601             break;
 602
 603         case SSL3_ST_CW_FINISHED_A:
 604         case SSL3_ST_CW_FINISHED_B:
 605             if (!s->hit)
 606                 dtls1_start_timer(s);
 607             ret = ssl3_send_finished(s,
 608                                      SSL3_ST_CW_FINISHED_A,
 609                                      SSL3_ST_CW_FINISHED_B,
 610                                      s->method->
 611                                      ssl3_enc->client_finished_label,
 612                                      s->method->
 613                                      ssl3_enc->client_finished_label_len);
 614             if (ret <= 0)
 615                 goto end;
 616             s->state = SSL3_ST_CW_FLUSH;
 617
 618             if (s->hit) {
 619                 s->s3->tmp.next_state = SSL_ST_OK;
 620 #ifndef OPENSSL_NO_SCTP
 621                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 622                     s->d1->next_state = s->s3->tmp.next_state;
 623                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 624                 }
 625 #endif
 626             } else {
 627 #ifndef OPENSSL_NO_SCTP
 628                 /*
 629                  * Change to new shared key of SCTP-Auth, will be ignored if
 630                  * no SCTP used.
 631                  */
 632                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 633                          0, NULL);
 634 #endif
 635
 636                 /*
 637                  * Allow NewSessionTicket if ticket expected
 638                  */
 639                 if (s->tlsext_ticket_expected)
 640                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 641                 else
 642                     s->s3->tmp.next_state = SSL3_ST_CR_CHANGE_A;
 643             }
 644             s->init_num = 0;
 645             break;
 646
 647         case SSL3_ST_CR_SESSION_TICKET_A:
 648         case SSL3_ST_CR_SESSION_TICKET_B:
 649             ret = ssl3_get_new_session_ticket(s);
 650             if (ret <= 0)
 651                 goto end;
 652             s->state = SSL3_ST_CR_CHANGE_A;
 653             s->init_num = 0;
 654             break;
 655
 656         case SSL3_ST_CR_CERT_STATUS_A:
 657         case SSL3_ST_CR_CERT_STATUS_B:
 658             ret = ssl3_get_cert_status(s);
 659             if (ret <= 0)
 660                 goto end;
 661             s->state = SSL3_ST_CR_KEY_EXCH_A;
 662             s->init_num = 0;
 663             break;
 664
 665         case SSL3_ST_CR_CHANGE_A:
 666         case SSL3_ST_CR_CHANGE_B:
 667             ret = ssl3_get_change_cipher_spec(s, SSL3_ST_CR_CHANGE_A,
 668                                               SSL3_ST_CR_CHANGE_B);
 669             if (ret <= 0)
 670                 goto end;
 671
 672             s->state = SSL3_ST_CR_FINISHED_A;
 673             s->init_num = 0;
 674             break;
 675
 676         case SSL3_ST_CR_FINISHED_A:
 677         case SSL3_ST_CR_FINISHED_B:
 678             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 679                                     SSL3_ST_CR_FINISHED_B);
 680             if (ret <= 0)
 681                 goto end;
 682             dtls1_stop_timer(s);
 683
 684             if (s->hit)
 685                 s->state = SSL3_ST_CW_CHANGE_A;
 686             else
 687                 s->state = SSL_ST_OK;
 688
 689 #ifndef OPENSSL_NO_SCTP
 690             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 691                 state == SSL_ST_RENEGOTIATE) {
 692                 s->d1->next_state = s->state;
 693                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 694             }
 695 #endif
 696
 697             s->init_num = 0;
 698             break;
 699
 700         case SSL3_ST_CW_FLUSH:
 701             s->rwstate = SSL_WRITING;
 702             if (BIO_flush(s->wbio) <= 0) {
 703                 /*
 704                  * If the write error was fatal, stop trying
 705                  */
 706                 if (!BIO_should_retry(s->wbio)) {
 707                     s->rwstate = SSL_NOTHING;
 708                     s->state = s->s3->tmp.next_state;
 709                 }
 710
 711                 ret = -1;
 712                 goto end;
 713             }
 714             s->rwstate = SSL_NOTHING;
 715             s->state = s->s3->tmp.next_state;
 716             break;
 717
 718         case SSL_ST_OK:
 719             /* clean a few things up */
 720             ssl3_cleanup_key_block(s);
 721
 722             /* Remove the buffering */
 723             ssl_free_wbio_buffer(s);
 724
 725             s->init_num = 0;
 726             s->renegotiate = 0;
 727             s->new_session = 0;
 728
 729             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 730             if (s->hit)
 731                 s->ctx->stats.sess_hit++;
 732
 733             ret = 1;
 734             /* s->server=0; */
 735             s->handshake_func = dtls1_connect;
 736             s->ctx->stats.sess_connect_good++;
 737
 738             if (cb != NULL)
 739                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 740
 741             /* done with handshaking */
 742             s->d1->handshake_read_seq = 0;
 743             s->d1->next_handshake_write_seq = 0;
 744             goto end;
 745             /* break; */
 746
 747         case SSL_ST_ERR:
 748         default:
 749             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 750             ret = -1;
 751             goto end;
 752             /* break; */
 753         }
 754
 755         /* did we do anything */
 756         if (!s->s3->tmp.reuse_message && !skip) {
 757             if (s->debug) {
 758                 if ((ret = BIO_flush(s->wbio)) <= 0)
 759                     goto end;
 760             }
 761
 762             if ((cb != NULL) && (s->state != state)) {
 763                 new_state = s->state;
 764                 s->state = state;
 765                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 766                 s->state = new_state;
 767             }
 768         }
 769         skip = 0;
 770     }
 771  end:
 772     s->in_handshake--;
 773
 774 #ifndef OPENSSL_NO_SCTP
 775     /*
 776      * Notify SCTP BIO socket to leave handshake mode and allow stream
 777      * identifier other than 0. Will be ignored if no SCTP is used.
 778      */
 779     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 780              s->in_handshake, NULL);
 781 #endif
 782
 783     BUF_MEM_free(buf);
 784     if (cb != NULL)
 785         cb(s, SSL_CB_CONNECT_EXIT, ret);
 786     return (ret);
 787 }
 788
 789 static int dtls1_get_hello_verify(SSL *s)
 790 {
 791     int n, al, ok = 0;
 792     unsigned char *data;
 793     unsigned int cookie_len;
 794
 795     s->first_packet = 1;
 796     n = s->method->ssl_get_message(s,
 797                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 798                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 799                                    -1, s->max_cert_list, &ok);
 800     s->first_packet = 0;
 801
 802     if (!ok)
 803         return ((int)n);
 804
 805     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 806         s->d1->send_cookie = 0;
 807         s->s3->tmp.reuse_message = 1;
 808         return (1);
 809     }
 810
 811     data = (unsigned char *)s->init_msg;
 812     data += 2;
 813
 814     cookie_len = *(data++);
 815     if (cookie_len > sizeof(s->d1->cookie)) {
 816         al = SSL_AD_ILLEGAL_PARAMETER;
 817         goto f_err;
 818     }
 819
 820     memcpy(s->d1->cookie, data, cookie_len);
 821     s->d1->cookie_len = cookie_len;
 822
 823     s->d1->send_cookie = 1;
 824     return 1;
 825
 826  f_err:
 827     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 828     s->state = SSL_ST_ERR;
 829     return -1;
 830 }