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                 } else
 384                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 385             }
 386             s->init_num = 0;
 387             break;
 388
 389         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 390         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 391
 392             ret = dtls1_get_hello_verify(s);
 393             if (ret <= 0)
 394                 goto end;
 395             dtls1_stop_timer(s);
 396             if (s->d1->send_cookie) /* start again, with a cookie */
 397                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 398             else
 399                 s->state = SSL3_ST_CR_CERT_A;
 400             s->init_num = 0;
 401             break;
 402
 403         case SSL3_ST_CR_CERT_A:
 404         case SSL3_ST_CR_CERT_B:
 405             /* Check if it is anon DH or PSK */
 406             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 407                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 408                 ret = ssl3_get_server_certificate(s);
 409                 if (ret <= 0)
 410                     goto end;
 411
 412                 if (s->tlsext_status_expected)
 413                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 414                 else
 415                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 416             } else {
 417                 skip = 1;
 418                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 419             }
 420
 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                 s->state = SSL_ST_ERR;
 439                 goto end;
 440             }
 441             break;
 442
 443         case SSL3_ST_CR_CERT_REQ_A:
 444         case SSL3_ST_CR_CERT_REQ_B:
 445             ret = ssl3_get_certificate_request(s);
 446             if (ret <= 0)
 447                 goto end;
 448             s->state = SSL3_ST_CR_SRVR_DONE_A;
 449             s->init_num = 0;
 450             break;
 451
 452         case SSL3_ST_CR_SRVR_DONE_A:
 453         case SSL3_ST_CR_SRVR_DONE_B:
 454             ret = ssl3_get_server_done(s);
 455             if (ret <= 0)
 456                 goto end;
 457             dtls1_stop_timer(s);
 458             if (s->s3->tmp.cert_req)
 459                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 460             else
 461                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 462             s->init_num = 0;
 463
 464 #ifndef OPENSSL_NO_SCTP
 465             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 466                 state == SSL_ST_RENEGOTIATE)
 467                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 468             else
 469 #endif
 470                 s->state = s->s3->tmp.next_state;
 471             break;
 472
 473         case SSL3_ST_CW_CERT_A:
 474         case SSL3_ST_CW_CERT_B:
 475         case SSL3_ST_CW_CERT_C:
 476         case SSL3_ST_CW_CERT_D:
 477             dtls1_start_timer(s);
 478             ret = ssl3_send_client_certificate(s);
 479             if (ret <= 0)
 480                 goto end;
 481             s->state = SSL3_ST_CW_KEY_EXCH_A;
 482             s->init_num = 0;
 483             break;
 484
 485         case SSL3_ST_CW_KEY_EXCH_A:
 486         case SSL3_ST_CW_KEY_EXCH_B:
 487             dtls1_start_timer(s);
 488             ret = ssl3_send_client_key_exchange(s);
 489             if (ret <= 0)
 490                 goto end;
 491
 492 #ifndef OPENSSL_NO_SCTP
 493             /*
 494              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 495              * used.
 496              */
 497             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 498                      DTLS1_SCTP_AUTH_LABEL);
 499
 500             if (SSL_export_keying_material(s, sctpauthkey,
 501                                        sizeof(sctpauthkey), labelbuffer,
 502                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 503                 ret = -1;
 504                 s->state = SSL_ST_ERR;
 505                 goto end;
 506             }
 507
 508             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 509                      sizeof(sctpauthkey), sctpauthkey);
 510 #endif
 511
 512             /*
 513              * EAY EAY EAY need to check for DH fix cert sent back
 514              */
 515             /*
 516              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 517              * sent, but no verify packet is sent
 518              */
 519             if (s->s3->tmp.cert_req == 1) {
 520                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 521             } else {
 522 #ifndef OPENSSL_NO_SCTP
 523                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 524                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 525                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 526                 } else
 527 #endif
 528                     s->state = SSL3_ST_CW_CHANGE_A;
 529             }
 530
 531             s->init_num = 0;
 532             break;
 533
 534         case SSL3_ST_CW_CERT_VRFY_A:
 535         case SSL3_ST_CW_CERT_VRFY_B:
 536             dtls1_start_timer(s);
 537             ret = ssl3_send_client_verify(s);
 538             if (ret <= 0)
 539                 goto end;
 540 #ifndef OPENSSL_NO_SCTP
 541             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 542                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 543                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 544             } else
 545 #endif
 546                 s->state = SSL3_ST_CW_CHANGE_A;
 547             s->init_num = 0;
 548             break;
 549
 550         case SSL3_ST_CW_CHANGE_A:
 551         case SSL3_ST_CW_CHANGE_B:
 552             if (!s->hit)
 553                 dtls1_start_timer(s);
 554             ret = dtls1_send_change_cipher_spec(s,
 555                                                 SSL3_ST_CW_CHANGE_A,
 556                                                 SSL3_ST_CW_CHANGE_B);
 557             if (ret <= 0)
 558                 goto end;
 559
 560             s->state = SSL3_ST_CW_FINISHED_A;
 561             s->init_num = 0;
 562
 563             s->session->cipher = s->s3->tmp.new_cipher;
 564 #ifdef OPENSSL_NO_COMP
 565             s->session->compress_meth = 0;
 566 #else
 567             if (s->s3->tmp.new_compression == NULL)
 568                 s->session->compress_meth = 0;
 569             else
 570                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 571 #endif
 572             if (!s->method->ssl3_enc->setup_key_block(s)) {
 573                 ret = -1;
 574                 s->state = SSL_ST_ERR;
 575                 goto end;
 576             }
 577
 578             if (!s->method->ssl3_enc->change_cipher_state(s,
 579                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 580             {
 581                 ret = -1;
 582                 s->state = SSL_ST_ERR;
 583                 goto end;
 584             }
 585 #ifndef OPENSSL_NO_SCTP
 586             if (s->hit) {
 587                 /*
 588                  * Change to new shared key of SCTP-Auth, will be ignored if
 589                  * no SCTP used.
 590                  */
 591                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 592                          0, NULL);
 593             }
 594 #endif
 595
 596             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 597             break;
 598
 599         case SSL3_ST_CW_FINISHED_A:
 600         case SSL3_ST_CW_FINISHED_B:
 601             if (!s->hit)
 602                 dtls1_start_timer(s);
 603             ret = ssl3_send_finished(s,
 604                                      SSL3_ST_CW_FINISHED_A,
 605                                      SSL3_ST_CW_FINISHED_B,
 606                                      s->method->
 607                                      ssl3_enc->client_finished_label,
 608                                      s->method->
 609                                      ssl3_enc->client_finished_label_len);
 610             if (ret <= 0)
 611                 goto end;
 612             s->state = SSL3_ST_CW_FLUSH;
 613
 614             if (s->hit) {
 615                 s->s3->tmp.next_state = SSL_ST_OK;
 616 #ifndef OPENSSL_NO_SCTP
 617                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 618                     s->d1->next_state = s->s3->tmp.next_state;
 619                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 620                 }
 621 #endif
 622             } else {
 623 #ifndef OPENSSL_NO_SCTP
 624                 /*
 625                  * Change to new shared key of SCTP-Auth, will be ignored if
 626                  * no SCTP used.
 627                  */
 628                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 629                          0, NULL);
 630 #endif
 631
 632                 /*
 633                  * Allow NewSessionTicket if ticket expected
 634                  */
 635                 if (s->tlsext_ticket_expected)
 636                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 637                 else
 638                     s->s3->tmp.next_state = SSL3_ST_CR_CHANGE_A;
 639             }
 640             s->init_num = 0;
 641             break;
 642
 643         case SSL3_ST_CR_SESSION_TICKET_A:
 644         case SSL3_ST_CR_SESSION_TICKET_B:
 645             ret = ssl3_get_new_session_ticket(s);
 646             if (ret <= 0)
 647                 goto end;
 648             s->state = SSL3_ST_CR_CHANGE_A;
 649             s->init_num = 0;
 650             break;
 651
 652         case SSL3_ST_CR_CERT_STATUS_A:
 653         case SSL3_ST_CR_CERT_STATUS_B:
 654             ret = ssl3_get_cert_status(s);
 655             if (ret <= 0)
 656                 goto end;
 657             s->state = SSL3_ST_CR_KEY_EXCH_A;
 658             s->init_num = 0;
 659             break;
 660
 661         case SSL3_ST_CR_CHANGE_A:
 662         case SSL3_ST_CR_CHANGE_B:
 663             ret = ssl3_get_change_cipher_spec(s, SSL3_ST_CR_CHANGE_A,
 664                                               SSL3_ST_CR_CHANGE_B);
 665             if (ret <= 0)
 666                 goto end;
 667
 668             s->state = SSL3_ST_CR_FINISHED_A;
 669             s->init_num = 0;
 670             break;
 671
 672         case SSL3_ST_CR_FINISHED_A:
 673         case SSL3_ST_CR_FINISHED_B:
 674             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 675                                     SSL3_ST_CR_FINISHED_B);
 676             if (ret <= 0)
 677                 goto end;
 678             dtls1_stop_timer(s);
 679
 680             if (s->hit)
 681                 s->state = SSL3_ST_CW_CHANGE_A;
 682             else
 683                 s->state = SSL_ST_OK;
 684
 685 #ifndef OPENSSL_NO_SCTP
 686             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 687                 state == SSL_ST_RENEGOTIATE) {
 688                 s->d1->next_state = s->state;
 689                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 690             }
 691 #endif
 692
 693             s->init_num = 0;
 694             break;
 695
 696         case SSL3_ST_CW_FLUSH:
 697             s->rwstate = SSL_WRITING;
 698             if (BIO_flush(s->wbio) <= 0) {
 699                 /*
 700                  * If the write error was fatal, stop trying
 701                  */
 702                 if (!BIO_should_retry(s->wbio)) {
 703                     s->rwstate = SSL_NOTHING;
 704                     s->state = s->s3->tmp.next_state;
 705                 }
 706
 707                 ret = -1;
 708                 goto end;
 709             }
 710             s->rwstate = SSL_NOTHING;
 711             s->state = s->s3->tmp.next_state;
 712             break;
 713
 714         case SSL_ST_OK:
 715             /* clean a few things up */
 716             ssl3_cleanup_key_block(s);
 717
 718             /* Remove the buffering */
 719             ssl_free_wbio_buffer(s);
 720
 721             s->init_num = 0;
 722             s->renegotiate = 0;
 723             s->new_session = 0;
 724
 725             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 726             if (s->hit)
 727                 s->ctx->stats.sess_hit++;
 728
 729             ret = 1;
 730             /* s->server=0; */
 731             s->handshake_func = dtls1_connect;
 732             s->ctx->stats.sess_connect_good++;
 733
 734             if (cb != NULL)
 735                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 736
 737             /* done with handshaking */
 738             s->d1->handshake_read_seq = 0;
 739             s->d1->next_handshake_write_seq = 0;
 740             goto end;
 741             /* break; */
 742
 743         case SSL_ST_ERR:
 744         default:
 745             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 746             ret = -1;
 747             goto end;
 748             /* break; */
 749         }
 750
 751         /* did we do anything */
 752         if (!s->s3->tmp.reuse_message && !skip) {
 753             if (s->debug) {
 754                 if ((ret = BIO_flush(s->wbio)) <= 0)
 755                     goto end;
 756             }
 757
 758             if ((cb != NULL) && (s->state != state)) {
 759                 new_state = s->state;
 760                 s->state = state;
 761                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 762                 s->state = new_state;
 763             }
 764         }
 765         skip = 0;
 766     }
 767  end:
 768     s->in_handshake--;
 769
 770 #ifndef OPENSSL_NO_SCTP
 771     /*
 772      * Notify SCTP BIO socket to leave handshake mode and allow stream
 773      * identifier other than 0. Will be ignored if no SCTP is used.
 774      */
 775     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 776              s->in_handshake, NULL);
 777 #endif
 778
 779     BUF_MEM_free(buf);
 780     if (cb != NULL)
 781         cb(s, SSL_CB_CONNECT_EXIT, ret);
 782     return (ret);
 783 }
 784
 785 static int dtls1_get_hello_verify(SSL *s)
 786 {
 787     int n, al, ok = 0;
 788     unsigned char *data;
 789     unsigned int cookie_len;
 790
 791     s->first_packet = 1;
 792     n = s->method->ssl_get_message(s,
 793                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 794                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 795                                    -1, s->max_cert_list, &ok);
 796     s->first_packet = 0;
 797
 798     if (!ok)
 799         return ((int)n);
 800
 801     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 802         s->d1->send_cookie = 0;
 803         s->s3->tmp.reuse_message = 1;
 804         return (1);
 805     }
 806
 807     data = (unsigned char *)s->init_msg;
 808     data += 2;
 809
 810     cookie_len = *(data++);
 811     if (cookie_len > sizeof(s->d1->cookie)) {
 812         al = SSL_AD_ILLEGAL_PARAMETER;
 813         goto f_err;
 814     }
 815
 816     memcpy(s->d1->cookie, data, cookie_len);
 817     s->d1->cookie_len = cookie_len;
 818
 819     s->d1->send_cookie = 1;
 820     return 1;
 821
 822  f_err:
 823     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 824     s->state = SSL_ST_ERR;
 825     return -1;
 826 }