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             s->d1->change_cipher_spec_ok = 0;
 275             /*
 276              * Should have been reset by ssl3_get_finished, too.
 277              */
 278             s->s3->change_cipher_spec = 0;
 279             break;
 280
 281 #ifndef OPENSSL_NO_SCTP
 282         case DTLS1_SCTP_ST_CR_READ_SOCK:
 283
 284             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 285                 s->s3->in_read_app_data = 2;
 286                 s->rwstate = SSL_READING;
 287                 BIO_clear_retry_flags(SSL_get_rbio(s));
 288                 BIO_set_retry_read(SSL_get_rbio(s));
 289                 ret = -1;
 290                 goto end;
 291             }
 292
 293             s->state = s->s3->tmp.next_state;
 294             break;
 295
 296         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 297             /* read app data until dry event */
 298
 299             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 300             if (ret < 0)
 301                 goto end;
 302
 303             if (ret == 0) {
 304                 s->s3->in_read_app_data = 2;
 305                 s->rwstate = SSL_READING;
 306                 BIO_clear_retry_flags(SSL_get_rbio(s));
 307                 BIO_set_retry_read(SSL_get_rbio(s));
 308                 ret = -1;
 309                 goto end;
 310             }
 311
 312             s->state = s->d1->next_state;
 313             break;
 314 #endif
 315
 316         case SSL3_ST_CW_CLNT_HELLO_A:
 317         case SSL3_ST_CW_CLNT_HELLO_B:
 318
 319             s->shutdown = 0;
 320
 321             /* every DTLS ClientHello resets Finished MAC */
 322             ssl3_init_finished_mac(s);
 323
 324             dtls1_start_timer(s);
 325             ret = ssl3_client_hello(s);
 326             if (ret <= 0)
 327                 goto end;
 328
 329             if (s->d1->send_cookie) {
 330                 s->state = SSL3_ST_CW_FLUSH;
 331                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 332             } else
 333                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 334
 335             s->init_num = 0;
 336
 337 #ifndef OPENSSL_NO_SCTP
 338             /* Disable buffering for SCTP */
 339             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 340 #endif
 341                 /*
 342                  * turn on buffering for the next lot of output
 343                  */
 344                 if (s->bbio != s->wbio)
 345                     s->wbio = BIO_push(s->bbio, s->wbio);
 346 #ifndef OPENSSL_NO_SCTP
 347             }
 348 #endif
 349
 350             break;
 351
 352         case SSL3_ST_CR_SRVR_HELLO_A:
 353         case SSL3_ST_CR_SRVR_HELLO_B:
 354             ret = ssl3_get_server_hello(s);
 355             if (ret <= 0)
 356                 goto end;
 357             else {
 358                 if (s->hit) {
 359 #ifndef OPENSSL_NO_SCTP
 360                     /*
 361                      * Add new shared key for SCTP-Auth, will be ignored if
 362                      * no SCTP used.
 363                      */
 364                     snprintf((char *)labelbuffer,
 365                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 366                              DTLS1_SCTP_AUTH_LABEL);
 367
 368                     SSL_export_keying_material(s, sctpauthkey,
 369                                                sizeof(sctpauthkey),
 370                                                labelbuffer,
 371                                                sizeof(labelbuffer), NULL, 0,
 372                                                0);
 373
 374                     BIO_ctrl(SSL_get_wbio(s),
 375                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 376                              sizeof(sctpauthkey), sctpauthkey);
 377 #endif
 378
 379                     s->state = SSL3_ST_CR_FINISHED_A;
 380                 } else
 381                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 382             }
 383             s->init_num = 0;
 384             break;
 385
 386         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 387         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 388
 389             ret = dtls1_get_hello_verify(s);
 390             if (ret <= 0)
 391                 goto end;
 392             dtls1_stop_timer(s);
 393             if (s->d1->send_cookie) /* start again, with a cookie */
 394                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 395             else
 396                 s->state = SSL3_ST_CR_CERT_A;
 397             s->init_num = 0;
 398             break;
 399
 400         case SSL3_ST_CR_CERT_A:
 401         case SSL3_ST_CR_CERT_B:
 402             /* Check if it is anon DH or PSK */
 403             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 404                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 405                 ret = ssl3_get_server_certificate(s);
 406                 if (ret <= 0)
 407                     goto end;
 408 #ifndef OPENSSL_NO_TLSEXT
 409                 if (s->tlsext_status_expected)
 410                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 411                 else
 412                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 413             } else {
 414                 skip = 1;
 415                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 416             }
 417 #else
 418             } else
 419                 skip = 1;
 420
 421             s->state = SSL3_ST_CR_KEY_EXCH_A;
 422 #endif
 423             s->init_num = 0;
 424             break;
 425
 426         case SSL3_ST_CR_KEY_EXCH_A:
 427         case SSL3_ST_CR_KEY_EXCH_B:
 428             ret = ssl3_get_key_exchange(s);
 429             if (ret <= 0)
 430                 goto end;
 431             s->state = SSL3_ST_CR_CERT_REQ_A;
 432             s->init_num = 0;
 433
 434             /*
 435              * at this point we check that we have the required stuff from
 436              * the server
 437              */
 438             if (!ssl3_check_cert_and_algorithm(s)) {
 439                 ret = -1;
 440                 s->state = SSL_ST_ERR;
 441                 goto end;
 442             }
 443             break;
 444
 445         case SSL3_ST_CR_CERT_REQ_A:
 446         case SSL3_ST_CR_CERT_REQ_B:
 447             ret = ssl3_get_certificate_request(s);
 448             if (ret <= 0)
 449                 goto end;
 450             s->state = SSL3_ST_CR_SRVR_DONE_A;
 451             s->init_num = 0;
 452             break;
 453
 454         case SSL3_ST_CR_SRVR_DONE_A:
 455         case SSL3_ST_CR_SRVR_DONE_B:
 456             ret = ssl3_get_server_done(s);
 457             if (ret <= 0)
 458                 goto end;
 459             dtls1_stop_timer(s);
 460             if (s->s3->tmp.cert_req)
 461                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 462             else
 463                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 464             s->init_num = 0;
 465
 466 #ifndef OPENSSL_NO_SCTP
 467             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 468                 state == SSL_ST_RENEGOTIATE)
 469                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 470             else
 471 #endif
 472                 s->state = s->s3->tmp.next_state;
 473             break;
 474
 475         case SSL3_ST_CW_CERT_A:
 476         case SSL3_ST_CW_CERT_B:
 477         case SSL3_ST_CW_CERT_C:
 478         case SSL3_ST_CW_CERT_D:
 479             dtls1_start_timer(s);
 480             ret = ssl3_send_client_certificate(s);
 481             if (ret <= 0)
 482                 goto end;
 483             s->state = SSL3_ST_CW_KEY_EXCH_A;
 484             s->init_num = 0;
 485             break;
 486
 487         case SSL3_ST_CW_KEY_EXCH_A:
 488         case SSL3_ST_CW_KEY_EXCH_B:
 489             dtls1_start_timer(s);
 490             ret = ssl3_send_client_key_exchange(s);
 491             if (ret <= 0)
 492                 goto end;
 493
 494 #ifndef OPENSSL_NO_SCTP
 495             /*
 496              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 497              * used.
 498              */
 499             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 500                      DTLS1_SCTP_AUTH_LABEL);
 501
 502             SSL_export_keying_material(s, sctpauthkey,
 503                                        sizeof(sctpauthkey), labelbuffer,
 504                                        sizeof(labelbuffer), NULL, 0, 0);
 505
 506             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 507                      sizeof(sctpauthkey), sctpauthkey);
 508 #endif
 509
 510             /*
 511              * EAY EAY EAY need to check for DH fix cert sent back
 512              */
 513             /*
 514              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 515              * sent, but no verify packet is sent
 516              */
 517             if (s->s3->tmp.cert_req == 1) {
 518                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 519             } else {
 520 #ifndef OPENSSL_NO_SCTP
 521                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 522                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 523                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 524                 } else
 525 #endif
 526                     s->state = SSL3_ST_CW_CHANGE_A;
 527             }
 528
 529             s->init_num = 0;
 530             break;
 531
 532         case SSL3_ST_CW_CERT_VRFY_A:
 533         case SSL3_ST_CW_CERT_VRFY_B:
 534             dtls1_start_timer(s);
 535             ret = ssl3_send_client_verify(s);
 536             if (ret <= 0)
 537                 goto end;
 538 #ifndef OPENSSL_NO_SCTP
 539             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 540                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 541                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 542             } else
 543 #endif
 544                 s->state = SSL3_ST_CW_CHANGE_A;
 545             s->init_num = 0;
 546             break;
 547
 548         case SSL3_ST_CW_CHANGE_A:
 549         case SSL3_ST_CW_CHANGE_B:
 550             if (!s->hit)
 551                 dtls1_start_timer(s);
 552             ret = dtls1_send_change_cipher_spec(s,
 553                                                 SSL3_ST_CW_CHANGE_A,
 554                                                 SSL3_ST_CW_CHANGE_B);
 555             if (ret <= 0)
 556                 goto end;
 557
 558             s->state = SSL3_ST_CW_FINISHED_A;
 559             s->init_num = 0;
 560
 561             s->session->cipher = s->s3->tmp.new_cipher;
 562 #ifdef OPENSSL_NO_COMP
 563             s->session->compress_meth = 0;
 564 #else
 565             if (s->s3->tmp.new_compression == NULL)
 566                 s->session->compress_meth = 0;
 567             else
 568                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 569 #endif
 570             if (!s->method->ssl3_enc->setup_key_block(s)) {
 571                 ret = -1;
 572                 s->state = SSL_ST_ERR;
 573                 goto end;
 574             }
 575
 576             if (!s->method->ssl3_enc->change_cipher_state(s,
 577                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 578             {
 579                 ret = -1;
 580                 s->state = SSL_ST_ERR;
 581                 goto end;
 582             }
 583 #ifndef OPENSSL_NO_SCTP
 584             if (s->hit) {
 585                 /*
 586                  * Change to new shared key of SCTP-Auth, will be ignored if
 587                  * no SCTP used.
 588                  */
 589                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 590                          0, NULL);
 591             }
 592 #endif
 593
 594             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 595             break;
 596
 597         case SSL3_ST_CW_FINISHED_A:
 598         case SSL3_ST_CW_FINISHED_B:
 599             if (!s->hit)
 600                 dtls1_start_timer(s);
 601             ret = ssl3_send_finished(s,
 602                                      SSL3_ST_CW_FINISHED_A,
 603                                      SSL3_ST_CW_FINISHED_B,
 604                                      s->method->
 605                                      ssl3_enc->client_finished_label,
 606                                      s->method->
 607                                      ssl3_enc->client_finished_label_len);
 608             if (ret <= 0)
 609                 goto end;
 610             s->state = SSL3_ST_CW_FLUSH;
 611
 612             /* clear flags */
 613             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 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                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 623                     s->state = SSL_ST_OK;
 624 #ifndef OPENSSL_NO_SCTP
 625                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 626                         s->d1->next_state = SSL_ST_OK;
 627                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 628                     }
 629 #endif
 630                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 631                     s->s3->delay_buf_pop_ret = 0;
 632                 }
 633             } else {
 634 #ifndef OPENSSL_NO_SCTP
 635                 /*
 636                  * Change to new shared key of SCTP-Auth, will be ignored if
 637                  * no SCTP used.
 638                  */
 639                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 640                          0, NULL);
 641 #endif
 642
 643 #ifndef OPENSSL_NO_TLSEXT
 644                 /*
 645                  * Allow NewSessionTicket if ticket expected
 646                  */
 647                 if (s->tlsext_ticket_expected)
 648                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 649                 else
 650 #endif
 651
 652                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 653             }
 654             s->init_num = 0;
 655             break;
 656
 657 #ifndef OPENSSL_NO_TLSEXT
 658         case SSL3_ST_CR_SESSION_TICKET_A:
 659         case SSL3_ST_CR_SESSION_TICKET_B:
 660             ret = ssl3_get_new_session_ticket(s);
 661             if (ret <= 0)
 662                 goto end;
 663             s->state = SSL3_ST_CR_FINISHED_A;
 664             s->init_num = 0;
 665             break;
 666
 667         case SSL3_ST_CR_CERT_STATUS_A:
 668         case SSL3_ST_CR_CERT_STATUS_B:
 669             ret = ssl3_get_cert_status(s);
 670             if (ret <= 0)
 671                 goto end;
 672             s->state = SSL3_ST_CR_KEY_EXCH_A;
 673             s->init_num = 0;
 674             break;
 675 #endif
 676
 677         case SSL3_ST_CR_FINISHED_A:
 678         case SSL3_ST_CR_FINISHED_B:
 679             s->d1->change_cipher_spec_ok = 1;
 680             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 681                                     SSL3_ST_CR_FINISHED_B);
 682             if (ret <= 0)
 683                 goto end;
 684             dtls1_stop_timer(s);
 685
 686             if (s->hit)
 687                 s->state = SSL3_ST_CW_CHANGE_A;
 688             else
 689                 s->state = SSL_ST_OK;
 690
 691 #ifndef OPENSSL_NO_SCTP
 692             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 693                 state == SSL_ST_RENEGOTIATE) {
 694                 s->d1->next_state = s->state;
 695                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 696             }
 697 #endif
 698
 699             s->init_num = 0;
 700             break;
 701
 702         case SSL3_ST_CW_FLUSH:
 703             s->rwstate = SSL_WRITING;
 704             if (BIO_flush(s->wbio) <= 0) {
 705                 /*
 706                  * If the write error was fatal, stop trying
 707                  */
 708                 if (!BIO_should_retry(s->wbio)) {
 709                     s->rwstate = SSL_NOTHING;
 710                     s->state = s->s3->tmp.next_state;
 711                 }
 712
 713                 ret = -1;
 714                 goto end;
 715             }
 716             s->rwstate = SSL_NOTHING;
 717             s->state = s->s3->tmp.next_state;
 718             break;
 719
 720         case SSL_ST_OK:
 721             /* clean a few things up */
 722             ssl3_cleanup_key_block(s);
 723
 724             /*
 725              * If we are not 'joining' the last two packets, remove the
 726              * buffering now
 727              */
 728             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 729                 ssl_free_wbio_buffer(s);
 730             /* else do it later in ssl3_write */
 731
 732             s->init_num = 0;
 733             s->renegotiate = 0;
 734             s->new_session = 0;
 735
 736             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 737             if (s->hit)
 738                 s->ctx->stats.sess_hit++;
 739
 740             ret = 1;
 741             /* s->server=0; */
 742             s->handshake_func = dtls1_connect;
 743             s->ctx->stats.sess_connect_good++;
 744
 745             if (cb != NULL)
 746                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 747
 748             /* done with handshaking */
 749             s->d1->handshake_read_seq = 0;
 750             s->d1->next_handshake_write_seq = 0;
 751             goto end;
 752             /* break; */
 753
 754         case SSL_ST_ERR:
 755         default:
 756             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 757             ret = -1;
 758             goto end;
 759             /* break; */
 760         }
 761
 762         /* did we do anything */
 763         if (!s->s3->tmp.reuse_message && !skip) {
 764             if (s->debug) {
 765                 if ((ret = BIO_flush(s->wbio)) <= 0)
 766                     goto end;
 767             }
 768
 769             if ((cb != NULL) && (s->state != state)) {
 770                 new_state = s->state;
 771                 s->state = state;
 772                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 773                 s->state = new_state;
 774             }
 775         }
 776         skip = 0;
 777     }
 778  end:
 779     s->in_handshake--;
 780
 781 #ifndef OPENSSL_NO_SCTP
 782     /*
 783      * Notify SCTP BIO socket to leave handshake mode and allow stream
 784      * identifier other than 0. Will be ignored if no SCTP is used.
 785      */
 786     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 787              s->in_handshake, NULL);
 788 #endif
 789
 790     BUF_MEM_free(buf);
 791     if (cb != NULL)
 792         cb(s, SSL_CB_CONNECT_EXIT, ret);
 793     return (ret);
 794 }
 795
 796 static int dtls1_get_hello_verify(SSL *s)
 797 {
 798     int n, al, ok = 0;
 799     unsigned char *data;
 800     unsigned int cookie_len;
 801
 802     s->first_packet = 1;
 803     n = s->method->ssl_get_message(s,
 804                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 805                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 806                                    -1, s->max_cert_list, &ok);
 807     s->first_packet = 0;
 808
 809     if (!ok)
 810         return ((int)n);
 811
 812     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 813         s->d1->send_cookie = 0;
 814         s->s3->tmp.reuse_message = 1;
 815         return (1);
 816     }
 817
 818     data = (unsigned char *)s->init_msg;
 819     data += 2;
 820
 821     cookie_len = *(data++);
 822     if (cookie_len > sizeof(s->d1->cookie)) {
 823         al = SSL_AD_ILLEGAL_PARAMETER;
 824         goto f_err;
 825     }
 826
 827     memcpy(s->d1->cookie, data, cookie_len);
 828     s->d1->cookie_len = cookie_len;
 829
 830     s->d1->send_cookie = 1;
 831     return 1;
 832
 833  f_err:
 834     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 835     s->state = SSL_ST_ERR;
 836     return -1;
 837 }