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 #ifndef OPENSSL_NO_KRB5
 119 # include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 # include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135 {
 136     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137         return (DTLSv1_client_method());
 138     else if (ver == DTLS1_2_VERSION)
 139         return (DTLSv1_2_client_method());
 140     else
 141         return (NULL);
 142 }
 143
 144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 145                           DTLSv1_client_method,
 146                           ssl_undefined_function,
 147                           dtls1_connect,
 148                           dtls1_get_client_method, DTLSv1_enc_data)
 149
 150     IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 151                           DTLSv1_2_client_method,
 152                           ssl_undefined_function,
 153                           dtls1_connect,
 154                           dtls1_get_client_method, DTLSv1_2_enc_data)
 155
 156     IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 157                           DTLS_client_method,
 158                           ssl_undefined_function,
 159                           dtls1_connect,
 160                           dtls1_get_client_method, DTLSv1_2_enc_data)
 161
 162 int dtls1_connect(SSL *s)
 163 {
 164     BUF_MEM *buf = NULL;
 165     unsigned long Time = (unsigned long)time(NULL);
 166     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 167     int ret = -1;
 168     int new_state, state, skip = 0;
 169 #ifndef OPENSSL_NO_SCTP
 170     unsigned char sctpauthkey[64];
 171     char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 172 #endif
 173
 174     RAND_add(&Time, sizeof(Time), 0);
 175     ERR_clear_error();
 176     clear_sys_error();
 177
 178     if (s->info_callback != NULL)
 179         cb = s->info_callback;
 180     else if (s->ctx->info_callback != NULL)
 181         cb = s->ctx->info_callback;
 182
 183     s->in_handshake++;
 184     if (!SSL_in_init(s) || SSL_in_before(s)) {
 185         if (!SSL_clear(s))
 186             return -1;
 187     }
 188
 189 #ifndef OPENSSL_NO_SCTP
 190     /*
 191      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 192      * identifier other than 0. Will be ignored if no SCTP is used.
 193      */
 194     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 195              s->in_handshake, NULL);
 196 #endif
 197
 198 #ifndef OPENSSL_NO_HEARTBEATS
 199     /*
 200      * If we're awaiting a HeartbeatResponse, pretend we already got and
 201      * don't await it anymore, because Heartbeats don't make sense during
 202      * handshakes anyway.
 203      */
 204     if (s->tlsext_hb_pending) {
 205         dtls1_stop_timer(s);
 206         s->tlsext_hb_pending = 0;
 207         s->tlsext_hb_seq++;
 208     }
 209 #endif
 210
 211     for (;;) {
 212         state = s->state;
 213
 214         switch (s->state) {
 215         case SSL_ST_RENEGOTIATE:
 216             s->renegotiate = 1;
 217             s->state = SSL_ST_CONNECT;
 218             s->ctx->stats.sess_connect_renegotiate++;
 219             /* break */
 220         case SSL_ST_BEFORE:
 221         case SSL_ST_CONNECT:
 222         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 223         case SSL_ST_OK | SSL_ST_CONNECT:
 224
 225             s->server = 0;
 226             if (cb != NULL)
 227                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 228
 229             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 230                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 231                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 232                 ret = -1;
 233                 goto end;
 234             }
 235
 236             /* s->version=SSL3_VERSION; */
 237             s->type = SSL_ST_CONNECT;
 238
 239             if (s->init_buf == NULL) {
 240                 if ((buf = BUF_MEM_new()) == NULL) {
 241                     ret = -1;
 242                     goto end;
 243                 }
 244                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 245                     ret = -1;
 246                     goto end;
 247                 }
 248                 s->init_buf = buf;
 249                 buf = NULL;
 250             }
 251
 252             if (!ssl3_setup_buffers(s)) {
 253                 ret = -1;
 254                 goto end;
 255             }
 256
 257             /* setup buffing BIO */
 258             if (!ssl_init_wbio_buffer(s, 0)) {
 259                 ret = -1;
 260                 goto end;
 261             }
 262
 263             /* don't push the buffering BIO quite yet */
 264
 265             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 266             s->ctx->stats.sess_connect++;
 267             s->init_num = 0;
 268             /* mark client_random uninitialized */
 269             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 270             s->d1->send_cookie = 0;
 271             s->hit = 0;
 272             s->d1->change_cipher_spec_ok = 0;
 273             /*
 274              * Should have been reset by ssl3_get_finished, too.
 275              */
 276             s->s3->change_cipher_spec = 0;
 277             break;
 278
 279 #ifndef OPENSSL_NO_SCTP
 280         case DTLS1_SCTP_ST_CR_READ_SOCK:
 281
 282             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 283                 s->s3->in_read_app_data = 2;
 284                 s->rwstate = SSL_READING;
 285                 BIO_clear_retry_flags(SSL_get_rbio(s));
 286                 BIO_set_retry_read(SSL_get_rbio(s));
 287                 ret = -1;
 288                 goto end;
 289             }
 290
 291             s->state = s->s3->tmp.next_state;
 292             break;
 293
 294         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 295             /* read app data until dry event */
 296
 297             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 298             if (ret < 0)
 299                 goto end;
 300
 301             if (ret == 0) {
 302                 s->s3->in_read_app_data = 2;
 303                 s->rwstate = SSL_READING;
 304                 BIO_clear_retry_flags(SSL_get_rbio(s));
 305                 BIO_set_retry_read(SSL_get_rbio(s));
 306                 ret = -1;
 307                 goto end;
 308             }
 309
 310             s->state = s->d1->next_state;
 311             break;
 312 #endif
 313
 314         case SSL3_ST_CW_CLNT_HELLO_A:
 315         case SSL3_ST_CW_CLNT_HELLO_B:
 316
 317             s->shutdown = 0;
 318
 319             /* every DTLS ClientHello resets Finished MAC */
 320             ssl3_init_finished_mac(s);
 321
 322             dtls1_start_timer(s);
 323             ret = ssl3_client_hello(s);
 324             if (ret <= 0)
 325                 goto end;
 326
 327             if (s->d1->send_cookie) {
 328                 s->state = SSL3_ST_CW_FLUSH;
 329                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 330             } else
 331                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 332
 333             s->init_num = 0;
 334
 335 #ifndef OPENSSL_NO_SCTP
 336             /* Disable buffering for SCTP */
 337             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 338 #endif
 339                 /*
 340                  * turn on buffering for the next lot of output
 341                  */
 342                 if (s->bbio != s->wbio)
 343                     s->wbio = BIO_push(s->bbio, s->wbio);
 344 #ifndef OPENSSL_NO_SCTP
 345             }
 346 #endif
 347
 348             break;
 349
 350         case SSL3_ST_CR_SRVR_HELLO_A:
 351         case SSL3_ST_CR_SRVR_HELLO_B:
 352             ret = ssl3_get_server_hello(s);
 353             if (ret <= 0)
 354                 goto end;
 355             else {
 356                 if (s->hit) {
 357 #ifndef OPENSSL_NO_SCTP
 358                     /*
 359                      * Add new shared key for SCTP-Auth, will be ignored if
 360                      * no SCTP used.
 361                      */
 362                     snprintf((char *)labelbuffer,
 363                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 364                              DTLS1_SCTP_AUTH_LABEL);
 365
 366                     SSL_export_keying_material(s, sctpauthkey,
 367                                                sizeof(sctpauthkey),
 368                                                labelbuffer,
 369                                                sizeof(labelbuffer), NULL, 0,
 370                                                0);
 371
 372                     BIO_ctrl(SSL_get_wbio(s),
 373                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 374                              sizeof(sctpauthkey), sctpauthkey);
 375 #endif
 376
 377                     s->state = SSL3_ST_CR_FINISHED_A;
 378                 } else
 379                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 380             }
 381             s->init_num = 0;
 382             break;
 383
 384         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 385         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 386
 387             ret = dtls1_get_hello_verify(s);
 388             if (ret <= 0)
 389                 goto end;
 390             dtls1_stop_timer(s);
 391             if (s->d1->send_cookie) /* start again, with a cookie */
 392                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 393             else
 394                 s->state = SSL3_ST_CR_CERT_A;
 395             s->init_num = 0;
 396             break;
 397
 398         case SSL3_ST_CR_CERT_A:
 399         case SSL3_ST_CR_CERT_B:
 400             /* Check if it is anon DH or PSK */
 401             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 402                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 403                 ret = ssl3_get_server_certificate(s);
 404                 if (ret <= 0)
 405                     goto end;
 406 #ifndef OPENSSL_NO_TLSEXT
 407                 if (s->tlsext_status_expected)
 408                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 409                 else
 410                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 411             } else {
 412                 skip = 1;
 413                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 414             }
 415 #else
 416             } else
 417                 skip = 1;
 418
 419             s->state = SSL3_ST_CR_KEY_EXCH_A;
 420 #endif
 421             s->init_num = 0;
 422             break;
 423
 424         case SSL3_ST_CR_KEY_EXCH_A:
 425         case SSL3_ST_CR_KEY_EXCH_B:
 426             ret = ssl3_get_key_exchange(s);
 427             if (ret <= 0)
 428                 goto end;
 429             s->state = SSL3_ST_CR_CERT_REQ_A;
 430             s->init_num = 0;
 431
 432             /*
 433              * at this point we check that we have the required stuff from
 434              * the server
 435              */
 436             if (!ssl3_check_cert_and_algorithm(s)) {
 437                 ret = -1;
 438                 goto end;
 439             }
 440             break;
 441
 442         case SSL3_ST_CR_CERT_REQ_A:
 443         case SSL3_ST_CR_CERT_REQ_B:
 444             ret = ssl3_get_certificate_request(s);
 445             if (ret <= 0)
 446                 goto end;
 447             s->state = SSL3_ST_CR_SRVR_DONE_A;
 448             s->init_num = 0;
 449             break;
 450
 451         case SSL3_ST_CR_SRVR_DONE_A:
 452         case SSL3_ST_CR_SRVR_DONE_B:
 453             ret = ssl3_get_server_done(s);
 454             if (ret <= 0)
 455                 goto end;
 456             dtls1_stop_timer(s);
 457             if (s->s3->tmp.cert_req)
 458                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 459             else
 460                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 461             s->init_num = 0;
 462
 463 #ifndef OPENSSL_NO_SCTP
 464             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 465                 state == SSL_ST_RENEGOTIATE)
 466                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 467             else
 468 #endif
 469                 s->state = s->s3->tmp.next_state;
 470             break;
 471
 472         case SSL3_ST_CW_CERT_A:
 473         case SSL3_ST_CW_CERT_B:
 474         case SSL3_ST_CW_CERT_C:
 475         case SSL3_ST_CW_CERT_D:
 476             dtls1_start_timer(s);
 477             ret = ssl3_send_client_certificate(s);
 478             if (ret <= 0)
 479                 goto end;
 480             s->state = SSL3_ST_CW_KEY_EXCH_A;
 481             s->init_num = 0;
 482             break;
 483
 484         case SSL3_ST_CW_KEY_EXCH_A:
 485         case SSL3_ST_CW_KEY_EXCH_B:
 486             dtls1_start_timer(s);
 487             ret = ssl3_send_client_key_exchange(s);
 488             if (ret <= 0)
 489                 goto end;
 490
 491 #ifndef OPENSSL_NO_SCTP
 492             /*
 493              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 494              * used.
 495              */
 496             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 497                      DTLS1_SCTP_AUTH_LABEL);
 498
 499             SSL_export_keying_material(s, sctpauthkey,
 500                                        sizeof(sctpauthkey), labelbuffer,
 501                                        sizeof(labelbuffer), NULL, 0, 0);
 502
 503             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 504                      sizeof(sctpauthkey), sctpauthkey);
 505 #endif
 506
 507             /*
 508              * EAY EAY EAY need to check for DH fix cert sent back
 509              */
 510             /*
 511              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 512              * sent, but no verify packet is sent
 513              */
 514             if (s->s3->tmp.cert_req == 1) {
 515                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 516             } else {
 517 #ifndef OPENSSL_NO_SCTP
 518                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 519                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 520                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 521                 } else
 522 #endif
 523                     s->state = SSL3_ST_CW_CHANGE_A;
 524             }
 525
 526             s->init_num = 0;
 527             break;
 528
 529         case SSL3_ST_CW_CERT_VRFY_A:
 530         case SSL3_ST_CW_CERT_VRFY_B:
 531             dtls1_start_timer(s);
 532             ret = ssl3_send_client_verify(s);
 533             if (ret <= 0)
 534                 goto end;
 535 #ifndef OPENSSL_NO_SCTP
 536             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 537                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 538                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 539             } else
 540 #endif
 541                 s->state = SSL3_ST_CW_CHANGE_A;
 542             s->init_num = 0;
 543             break;
 544
 545         case SSL3_ST_CW_CHANGE_A:
 546         case SSL3_ST_CW_CHANGE_B:
 547             if (!s->hit)
 548                 dtls1_start_timer(s);
 549             ret = dtls1_send_change_cipher_spec(s,
 550                                                 SSL3_ST_CW_CHANGE_A,
 551                                                 SSL3_ST_CW_CHANGE_B);
 552             if (ret <= 0)
 553                 goto end;
 554
 555             s->state = SSL3_ST_CW_FINISHED_A;
 556             s->init_num = 0;
 557
 558             s->session->cipher = s->s3->tmp.new_cipher;
 559 #ifdef OPENSSL_NO_COMP
 560             s->session->compress_meth = 0;
 561 #else
 562             if (s->s3->tmp.new_compression == NULL)
 563                 s->session->compress_meth = 0;
 564             else
 565                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 566 #endif
 567             if (!s->method->ssl3_enc->setup_key_block(s)) {
 568                 ret = -1;
 569                 goto end;
 570             }
 571
 572             if (!s->method->ssl3_enc->change_cipher_state(s,
 573                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 574             {
 575                 ret = -1;
 576                 goto end;
 577             }
 578 #ifndef OPENSSL_NO_SCTP
 579             if (s->hit) {
 580                 /*
 581                  * Change to new shared key of SCTP-Auth, will be ignored if
 582                  * no SCTP used.
 583                  */
 584                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 585                          0, NULL);
 586             }
 587 #endif
 588
 589             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 590             break;
 591
 592         case SSL3_ST_CW_FINISHED_A:
 593         case SSL3_ST_CW_FINISHED_B:
 594             if (!s->hit)
 595                 dtls1_start_timer(s);
 596             ret = ssl3_send_finished(s,
 597                                      SSL3_ST_CW_FINISHED_A,
 598                                      SSL3_ST_CW_FINISHED_B,
 599                                      s->method->
 600                                      ssl3_enc->client_finished_label,
 601                                      s->method->
 602                                      ssl3_enc->client_finished_label_len);
 603             if (ret <= 0)
 604                 goto end;
 605             s->state = SSL3_ST_CW_FLUSH;
 606
 607             /* clear flags */
 608             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 609             if (s->hit) {
 610                 s->s3->tmp.next_state = SSL_ST_OK;
 611 #ifndef OPENSSL_NO_SCTP
 612                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 613                     s->d1->next_state = s->s3->tmp.next_state;
 614                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 615                 }
 616 #endif
 617                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 618                     s->state = SSL_ST_OK;
 619 #ifndef OPENSSL_NO_SCTP
 620                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 621                         s->d1->next_state = SSL_ST_OK;
 622                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 623                     }
 624 #endif
 625                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 626                     s->s3->delay_buf_pop_ret = 0;
 627                 }
 628             } else {
 629 #ifndef OPENSSL_NO_SCTP
 630                 /*
 631                  * Change to new shared key of SCTP-Auth, will be ignored if
 632                  * no SCTP used.
 633                  */
 634                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 635                          0, NULL);
 636 #endif
 637
 638 #ifndef OPENSSL_NO_TLSEXT
 639                 /*
 640                  * Allow NewSessionTicket if ticket expected
 641                  */
 642                 if (s->tlsext_ticket_expected)
 643                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 644                 else
 645 #endif
 646
 647                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 648             }
 649             s->init_num = 0;
 650             break;
 651
 652 #ifndef OPENSSL_NO_TLSEXT
 653         case SSL3_ST_CR_SESSION_TICKET_A:
 654         case SSL3_ST_CR_SESSION_TICKET_B:
 655             ret = ssl3_get_new_session_ticket(s);
 656             if (ret <= 0)
 657                 goto end;
 658             s->state = SSL3_ST_CR_FINISHED_A;
 659             s->init_num = 0;
 660             break;
 661
 662         case SSL3_ST_CR_CERT_STATUS_A:
 663         case SSL3_ST_CR_CERT_STATUS_B:
 664             ret = ssl3_get_cert_status(s);
 665             if (ret <= 0)
 666                 goto end;
 667             s->state = SSL3_ST_CR_KEY_EXCH_A;
 668             s->init_num = 0;
 669             break;
 670 #endif
 671
 672         case SSL3_ST_CR_FINISHED_A:
 673         case SSL3_ST_CR_FINISHED_B:
 674             s->d1->change_cipher_spec_ok = 1;
 675             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 676                                     SSL3_ST_CR_FINISHED_B);
 677             if (ret <= 0)
 678                 goto end;
 679             dtls1_stop_timer(s);
 680
 681             if (s->hit)
 682                 s->state = SSL3_ST_CW_CHANGE_A;
 683             else
 684                 s->state = SSL_ST_OK;
 685
 686 #ifndef OPENSSL_NO_SCTP
 687             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 688                 state == SSL_ST_RENEGOTIATE) {
 689                 s->d1->next_state = s->state;
 690                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 691             }
 692 #endif
 693
 694             s->init_num = 0;
 695             break;
 696
 697         case SSL3_ST_CW_FLUSH:
 698             s->rwstate = SSL_WRITING;
 699             if (BIO_flush(s->wbio) <= 0) {
 700                 /*
 701                  * If the write error was fatal, stop trying
 702                  */
 703                 if (!BIO_should_retry(s->wbio)) {
 704                     s->rwstate = SSL_NOTHING;
 705                     s->state = s->s3->tmp.next_state;
 706                 }
 707
 708                 ret = -1;
 709                 goto end;
 710             }
 711             s->rwstate = SSL_NOTHING;
 712             s->state = s->s3->tmp.next_state;
 713             break;
 714
 715         case SSL_ST_OK:
 716             /* clean a few things up */
 717             ssl3_cleanup_key_block(s);
 718
 719             /*
 720              * If we are not 'joining' the last two packets, remove the
 721              * buffering now
 722              */
 723             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 724                 ssl_free_wbio_buffer(s);
 725             /* else do it later in ssl3_write */
 726
 727             s->init_num = 0;
 728             s->renegotiate = 0;
 729             s->new_session = 0;
 730
 731             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 732             if (s->hit)
 733                 s->ctx->stats.sess_hit++;
 734
 735             ret = 1;
 736             /* s->server=0; */
 737             s->handshake_func = dtls1_connect;
 738             s->ctx->stats.sess_connect_good++;
 739
 740             if (cb != NULL)
 741                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 742
 743             /* done with handshaking */
 744             s->d1->handshake_read_seq = 0;
 745             s->d1->next_handshake_write_seq = 0;
 746             goto end;
 747             /* break; */
 748
 749         default:
 750             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 751             ret = -1;
 752             goto end;
 753             /* break; */
 754         }
 755
 756         /* did we do anything */
 757         if (!s->s3->tmp.reuse_message && !skip) {
 758             if (s->debug) {
 759                 if ((ret = BIO_flush(s->wbio)) <= 0)
 760                     goto end;
 761             }
 762
 763             if ((cb != NULL) && (s->state != state)) {
 764                 new_state = s->state;
 765                 s->state = state;
 766                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 767                 s->state = new_state;
 768             }
 769         }
 770         skip = 0;
 771     }
 772  end:
 773     s->in_handshake--;
 774
 775 #ifndef OPENSSL_NO_SCTP
 776     /*
 777      * Notify SCTP BIO socket to leave handshake mode and allow stream
 778      * identifier other than 0. Will be ignored if no SCTP is used.
 779      */
 780     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 781              s->in_handshake, NULL);
 782 #endif
 783
 784     if (buf != NULL)
 785         BUF_MEM_free(buf);
 786     if (cb != NULL)
 787         cb(s, SSL_CB_CONNECT_EXIT, ret);
 788     return (ret);
 789 }
 790
 791 static int dtls1_get_hello_verify(SSL *s)
 792 {
 793     int n, al, ok = 0;
 794     unsigned char *data;
 795     unsigned int cookie_len;
 796
 797     s->first_packet = 1;
 798     n = s->method->ssl_get_message(s,
 799                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 800                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 801                                    -1, s->max_cert_list, &ok);
 802     s->first_packet = 0;
 803
 804     if (!ok)
 805         return ((int)n);
 806
 807     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 808         s->d1->send_cookie = 0;
 809         s->s3->tmp.reuse_message = 1;
 810         return (1);
 811     }
 812
 813     data = (unsigned char *)s->init_msg;
 814     data += 2;
 815
 816     cookie_len = *(data++);
 817     if (cookie_len > sizeof(s->d1->cookie)) {
 818         al = SSL_AD_ILLEGAL_PARAMETER;
 819         goto f_err;
 820     }
 821
 822     memcpy(s->d1->cookie, data, cookie_len);
 823     s->d1->cookie_len = cookie_len;
 824
 825     s->d1->send_cookie = 1;
 826     return 1;
 827
 828  f_err:
 829     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 830     return -1;
 831 }