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 == DTLS_ANY_VERSION)
 137         return DTLS_client_method();
 138     else if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 139         return DTLSv1_client_method();
 140     else if (ver == DTLS1_2_VERSION)
 141         return DTLSv1_2_client_method();
 142     else
 143         return NULL;
 144 }
 145
 146 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 147                           DTLSv1_client_method,
 148                           ssl_undefined_function,
 149                           dtls1_connect,
 150                           dtls1_get_client_method, DTLSv1_enc_data)
 151
 152 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 153                           DTLSv1_2_client_method,
 154                           ssl_undefined_function,
 155                           dtls1_connect,
 156                           dtls1_get_client_method, DTLSv1_2_enc_data)
 157
 158 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 159                           DTLS_client_method,
 160                           ssl_undefined_function,
 161                           dtls1_connect,
 162                           dtls1_get_client_method, DTLSv1_2_enc_data)
 163
 164 int dtls1_connect(SSL *s)
 165 {
 166     BUF_MEM *buf = NULL;
 167     unsigned long Time = (unsigned long)time(NULL);
 168     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 169     int ret = -1;
 170     int new_state, state, skip = 0;
 171 #ifndef OPENSSL_NO_SCTP
 172     unsigned char sctpauthkey[64];
 173     char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 174 #endif
 175
 176     RAND_add(&Time, sizeof(Time), 0);
 177     ERR_clear_error();
 178     clear_sys_error();
 179
 180     if (s->info_callback != NULL)
 181         cb = s->info_callback;
 182     else if (s->ctx->info_callback != NULL)
 183         cb = s->ctx->info_callback;
 184
 185     s->in_handshake++;
 186     if (!SSL_in_init(s) || SSL_in_before(s))
 187         SSL_clear(s);
 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                 s->state = SSL_ST_ERR;
 234                 goto end;
 235             }
 236
 237             /* s->version=SSL3_VERSION; */
 238             s->type = SSL_ST_CONNECT;
 239
 240             if (s->init_buf == NULL) {
 241                 if ((buf = BUF_MEM_new()) == NULL) {
 242                     ret = -1;
 243                     s->state = SSL_ST_ERR;
 244                     goto end;
 245                 }
 246                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 247                     ret = -1;
 248                     s->state = SSL_ST_ERR;
 249                     goto end;
 250                 }
 251                 s->init_buf = buf;
 252                 buf = NULL;
 253             }
 254
 255             if (!ssl3_setup_buffers(s)) {
 256                 ret = -1;
 257                 s->state = SSL_ST_ERR;
 258                 goto end;
 259             }
 260
 261             /* setup buffing BIO */
 262             if (!ssl_init_wbio_buffer(s, 0)) {
 263                 ret = -1;
 264                 s->state = SSL_ST_ERR;
 265                 goto end;
 266             }
 267
 268             /* don't push the buffering BIO quite yet */
 269
 270             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 271             s->ctx->stats.sess_connect++;
 272             s->init_num = 0;
 273             /* mark client_random uninitialized */
 274             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 275             s->d1->send_cookie = 0;
 276             s->hit = 0;
 277             s->d1->change_cipher_spec_ok = 0;
 278             /*
 279              * Should have been reset by ssl3_get_finished, too.
 280              */
 281             s->s3->change_cipher_spec = 0;
 282             break;
 283
 284 #ifndef OPENSSL_NO_SCTP
 285         case DTLS1_SCTP_ST_CR_READ_SOCK:
 286
 287             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 288                 s->s3->in_read_app_data = 2;
 289                 s->rwstate = SSL_READING;
 290                 BIO_clear_retry_flags(SSL_get_rbio(s));
 291                 BIO_set_retry_read(SSL_get_rbio(s));
 292                 ret = -1;
 293                 goto end;
 294             }
 295
 296             s->state = s->s3->tmp.next_state;
 297             break;
 298
 299         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 300             /* read app data until dry event */
 301
 302             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 303             if (ret < 0)
 304                 goto end;
 305
 306             if (ret == 0) {
 307                 s->s3->in_read_app_data = 2;
 308                 s->rwstate = SSL_READING;
 309                 BIO_clear_retry_flags(SSL_get_rbio(s));
 310                 BIO_set_retry_read(SSL_get_rbio(s));
 311                 ret = -1;
 312                 goto end;
 313             }
 314
 315             s->state = s->d1->next_state;
 316             break;
 317 #endif
 318
 319         case SSL3_ST_CW_CLNT_HELLO_A:
 320             s->shutdown = 0;
 321
 322             /* every DTLS ClientHello resets Finished MAC */
 323             if (!ssl3_init_finished_mac(s)) {
 324                 ret = -1;
 325                 s->state = SSL_ST_ERR;
 326                 goto end;
 327             }
 328
 329             /* fall thru */
 330         case SSL3_ST_CW_CLNT_HELLO_B:
 331             dtls1_start_timer(s);
 332             ret = ssl3_client_hello(s);
 333             if (ret <= 0)
 334                 goto end;
 335
 336             if (s->d1->send_cookie) {
 337                 s->state = SSL3_ST_CW_FLUSH;
 338                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 339             } else
 340                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 341
 342             s->init_num = 0;
 343
 344 #ifndef OPENSSL_NO_SCTP
 345             /* Disable buffering for SCTP */
 346             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 347 #endif
 348                 /*
 349                  * turn on buffering for the next lot of output
 350                  */
 351                 if (s->bbio != s->wbio)
 352                     s->wbio = BIO_push(s->bbio, s->wbio);
 353 #ifndef OPENSSL_NO_SCTP
 354             }
 355 #endif
 356
 357             break;
 358
 359         case SSL3_ST_CR_SRVR_HELLO_A:
 360         case SSL3_ST_CR_SRVR_HELLO_B:
 361             ret = ssl3_get_server_hello(s);
 362             if (ret <= 0)
 363                 goto end;
 364             else {
 365                 if (s->hit) {
 366 #ifndef OPENSSL_NO_SCTP
 367                     /*
 368                      * Add new shared key for SCTP-Auth, will be ignored if
 369                      * no SCTP used.
 370                      */
 371                     snprintf((char *)labelbuffer,
 372                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 373                              DTLS1_SCTP_AUTH_LABEL);
 374
 375                     if (SSL_export_keying_material(s, sctpauthkey,
 376                                                sizeof(sctpauthkey),
 377                                                labelbuffer,
 378                                                sizeof(labelbuffer), NULL, 0,
 379                                                0) <= 0) {
 380                         ret = -1;
 381                         s->state = SSL_ST_ERR;
 382                         goto end;
 383                     }
 384
 385                     BIO_ctrl(SSL_get_wbio(s),
 386                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 387                              sizeof(sctpauthkey), sctpauthkey);
 388 #endif
 389
 390                     s->state = SSL3_ST_CR_FINISHED_A;
 391                     if (s->tlsext_ticket_expected) {
 392                         /* receive renewed session ticket */
 393                         s->state = SSL3_ST_CR_SESSION_TICKET_A;
 394                     }
 395                 } else
 396                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 397             }
 398             s->init_num = 0;
 399             break;
 400
 401         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 402         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 403
 404             ret = dtls1_get_hello_verify(s);
 405             if (ret <= 0)
 406                 goto end;
 407             dtls1_stop_timer(s);
 408             if (s->d1->send_cookie) /* start again, with a cookie */
 409                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 410             else
 411                 s->state = SSL3_ST_CR_CERT_A;
 412             s->init_num = 0;
 413             break;
 414
 415         case SSL3_ST_CR_CERT_A:
 416         case SSL3_ST_CR_CERT_B:
 417             /* Check if it is anon DH or PSK */
 418             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 419                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 420                 ret = ssl3_get_server_certificate(s);
 421                 if (ret <= 0)
 422                     goto end;
 423 #ifndef OPENSSL_NO_TLSEXT
 424                 if (s->tlsext_status_expected)
 425                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 426                 else
 427                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 428             } else {
 429                 skip = 1;
 430                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 431             }
 432 #else
 433             } else
 434                 skip = 1;
 435
 436             s->state = SSL3_ST_CR_KEY_EXCH_A;
 437 #endif
 438             s->init_num = 0;
 439             break;
 440
 441         case SSL3_ST_CR_KEY_EXCH_A:
 442         case SSL3_ST_CR_KEY_EXCH_B:
 443             ret = ssl3_get_key_exchange(s);
 444             if (ret <= 0)
 445                 goto end;
 446             s->state = SSL3_ST_CR_CERT_REQ_A;
 447             s->init_num = 0;
 448
 449             /*
 450              * at this point we check that we have the required stuff from
 451              * the server
 452              */
 453             if (!ssl3_check_cert_and_algorithm(s)) {
 454                 ret = -1;
 455                 s->state = SSL_ST_ERR;
 456                 goto end;
 457             }
 458             break;
 459
 460         case SSL3_ST_CR_CERT_REQ_A:
 461         case SSL3_ST_CR_CERT_REQ_B:
 462             ret = ssl3_get_certificate_request(s);
 463             if (ret <= 0)
 464                 goto end;
 465             s->state = SSL3_ST_CR_SRVR_DONE_A;
 466             s->init_num = 0;
 467             break;
 468
 469         case SSL3_ST_CR_SRVR_DONE_A:
 470         case SSL3_ST_CR_SRVR_DONE_B:
 471             ret = ssl3_get_server_done(s);
 472             if (ret <= 0)
 473                 goto end;
 474             dtls1_stop_timer(s);
 475             if (s->s3->tmp.cert_req)
 476                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 477             else
 478                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 479             s->init_num = 0;
 480
 481 #ifndef OPENSSL_NO_SCTP
 482             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 483                 state == SSL_ST_RENEGOTIATE)
 484                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 485             else
 486 #endif
 487                 s->state = s->s3->tmp.next_state;
 488             break;
 489
 490         case SSL3_ST_CW_CERT_A:
 491         case SSL3_ST_CW_CERT_B:
 492         case SSL3_ST_CW_CERT_C:
 493         case SSL3_ST_CW_CERT_D:
 494             dtls1_start_timer(s);
 495             ret = ssl3_send_client_certificate(s);
 496             if (ret <= 0)
 497                 goto end;
 498             s->state = SSL3_ST_CW_KEY_EXCH_A;
 499             s->init_num = 0;
 500             break;
 501
 502         case SSL3_ST_CW_KEY_EXCH_A:
 503         case SSL3_ST_CW_KEY_EXCH_B:
 504             dtls1_start_timer(s);
 505             ret = ssl3_send_client_key_exchange(s);
 506             if (ret <= 0)
 507                 goto end;
 508
 509 #ifndef OPENSSL_NO_SCTP
 510             /*
 511              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 512              * used.
 513              */
 514             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 515                      DTLS1_SCTP_AUTH_LABEL);
 516
 517             if (SSL_export_keying_material(s, sctpauthkey,
 518                                        sizeof(sctpauthkey), labelbuffer,
 519                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 520                 ret = -1;
 521                 s->state = SSL_ST_ERR;
 522                 goto end;
 523             }
 524
 525             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 526                      sizeof(sctpauthkey), sctpauthkey);
 527 #endif
 528
 529             /*
 530              * EAY EAY EAY need to check for DH fix cert sent back
 531              */
 532             /*
 533              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 534              * sent, but no verify packet is sent
 535              */
 536             if (s->s3->tmp.cert_req == 1) {
 537                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 538             } else {
 539 #ifndef OPENSSL_NO_SCTP
 540                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 541                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 542                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 543                 } else
 544 #endif
 545                     s->state = SSL3_ST_CW_CHANGE_A;
 546             }
 547
 548             s->init_num = 0;
 549             break;
 550
 551         case SSL3_ST_CW_CERT_VRFY_A:
 552         case SSL3_ST_CW_CERT_VRFY_B:
 553             dtls1_start_timer(s);
 554             ret = ssl3_send_client_verify(s);
 555             if (ret <= 0)
 556                 goto end;
 557 #ifndef OPENSSL_NO_SCTP
 558             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 559                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 560                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 561             } else
 562 #endif
 563                 s->state = SSL3_ST_CW_CHANGE_A;
 564             s->init_num = 0;
 565             break;
 566
 567         case SSL3_ST_CW_CHANGE_A:
 568         case SSL3_ST_CW_CHANGE_B:
 569             if (!s->hit)
 570                 dtls1_start_timer(s);
 571             ret = dtls1_send_change_cipher_spec(s,
 572                                                 SSL3_ST_CW_CHANGE_A,
 573                                                 SSL3_ST_CW_CHANGE_B);
 574             if (ret <= 0)
 575                 goto end;
 576
 577             s->state = SSL3_ST_CW_FINISHED_A;
 578             s->init_num = 0;
 579
 580             s->session->cipher = s->s3->tmp.new_cipher;
 581 #ifdef OPENSSL_NO_COMP
 582             s->session->compress_meth = 0;
 583 #else
 584             if (s->s3->tmp.new_compression == NULL)
 585                 s->session->compress_meth = 0;
 586             else
 587                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 588 #endif
 589             if (!s->method->ssl3_enc->setup_key_block(s)) {
 590                 ret = -1;
 591                 s->state = SSL_ST_ERR;
 592                 goto end;
 593             }
 594
 595             if (!s->method->ssl3_enc->change_cipher_state(s,
 596                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 597             {
 598                 ret = -1;
 599                 s->state = SSL_ST_ERR;
 600                 goto end;
 601             }
 602 #ifndef OPENSSL_NO_SCTP
 603             if (s->hit) {
 604                 /*
 605                  * Change to new shared key of SCTP-Auth, will be ignored if
 606                  * no SCTP used.
 607                  */
 608                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 609                          0, NULL);
 610             }
 611 #endif
 612
 613             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 614             break;
 615
 616         case SSL3_ST_CW_FINISHED_A:
 617         case SSL3_ST_CW_FINISHED_B:
 618             if (!s->hit)
 619                 dtls1_start_timer(s);
 620             ret = ssl3_send_finished(s,
 621                                      SSL3_ST_CW_FINISHED_A,
 622                                      SSL3_ST_CW_FINISHED_B,
 623                                      s->method->
 624                                      ssl3_enc->client_finished_label,
 625                                      s->method->
 626                                      ssl3_enc->client_finished_label_len);
 627             if (ret <= 0)
 628                 goto end;
 629             s->state = SSL3_ST_CW_FLUSH;
 630
 631             /* clear flags */
 632             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 633             if (s->hit) {
 634                 s->s3->tmp.next_state = SSL_ST_OK;
 635 #ifndef OPENSSL_NO_SCTP
 636                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 637                     s->d1->next_state = s->s3->tmp.next_state;
 638                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 639                 }
 640 #endif
 641                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 642                     s->state = SSL_ST_OK;
 643 #ifndef OPENSSL_NO_SCTP
 644                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 645                         s->d1->next_state = SSL_ST_OK;
 646                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 647                     }
 648 #endif
 649                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 650                     s->s3->delay_buf_pop_ret = 0;
 651                 }
 652             } else {
 653 #ifndef OPENSSL_NO_SCTP
 654                 /*
 655                  * Change to new shared key of SCTP-Auth, will be ignored if
 656                  * no SCTP used.
 657                  */
 658                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 659                          0, NULL);
 660 #endif
 661
 662 #ifndef OPENSSL_NO_TLSEXT
 663                 /*
 664                  * Allow NewSessionTicket if ticket expected
 665                  */
 666                 if (s->tlsext_ticket_expected)
 667                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 668                 else
 669 #endif
 670
 671                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 672             }
 673             s->init_num = 0;
 674             break;
 675
 676 #ifndef OPENSSL_NO_TLSEXT
 677         case SSL3_ST_CR_SESSION_TICKET_A:
 678         case SSL3_ST_CR_SESSION_TICKET_B:
 679             ret = ssl3_get_new_session_ticket(s);
 680             if (ret <= 0)
 681                 goto end;
 682             s->state = SSL3_ST_CR_FINISHED_A;
 683             s->init_num = 0;
 684             break;
 685
 686         case SSL3_ST_CR_CERT_STATUS_A:
 687         case SSL3_ST_CR_CERT_STATUS_B:
 688             ret = ssl3_get_cert_status(s);
 689             if (ret <= 0)
 690                 goto end;
 691             s->state = SSL3_ST_CR_KEY_EXCH_A;
 692             s->init_num = 0;
 693             break;
 694 #endif
 695
 696         case SSL3_ST_CR_FINISHED_A:
 697         case SSL3_ST_CR_FINISHED_B:
 698             s->d1->change_cipher_spec_ok = 1;
 699             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 700                                     SSL3_ST_CR_FINISHED_B);
 701             if (ret <= 0)
 702                 goto end;
 703             dtls1_stop_timer(s);
 704
 705             if (s->hit)
 706                 s->state = SSL3_ST_CW_CHANGE_A;
 707             else
 708                 s->state = SSL_ST_OK;
 709
 710 #ifndef OPENSSL_NO_SCTP
 711             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 712                 state == SSL_ST_RENEGOTIATE) {
 713                 s->d1->next_state = s->state;
 714                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 715             }
 716 #endif
 717
 718             s->init_num = 0;
 719             break;
 720
 721         case SSL3_ST_CW_FLUSH:
 722             s->rwstate = SSL_WRITING;
 723             if (BIO_flush(s->wbio) <= 0) {
 724                 /*
 725                  * If the write error was fatal, stop trying
 726                  */
 727                 if (!BIO_should_retry(s->wbio)) {
 728                     s->rwstate = SSL_NOTHING;
 729                     s->state = s->s3->tmp.next_state;
 730                 }
 731
 732                 ret = -1;
 733                 goto end;
 734             }
 735             s->rwstate = SSL_NOTHING;
 736             s->state = s->s3->tmp.next_state;
 737             break;
 738
 739         case SSL_ST_OK:
 740             /* clean a few things up */
 741             ssl3_cleanup_key_block(s);
 742
 743 #if 0
 744             if (s->init_buf != NULL) {
 745                 BUF_MEM_free(s->init_buf);
 746                 s->init_buf = NULL;
 747             }
 748 #endif
 749
 750             /*
 751              * If we are not 'joining' the last two packets, remove the
 752              * buffering now
 753              */
 754             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 755                 ssl_free_wbio_buffer(s);
 756             /* else do it later in ssl3_write */
 757
 758             s->init_num = 0;
 759             s->renegotiate = 0;
 760             s->new_session = 0;
 761
 762             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 763             if (s->hit)
 764                 s->ctx->stats.sess_hit++;
 765
 766             ret = 1;
 767             /* s->server=0; */
 768             s->handshake_func = dtls1_connect;
 769             s->ctx->stats.sess_connect_good++;
 770
 771             if (cb != NULL)
 772                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 773
 774             /* done with handshaking */
 775             s->d1->handshake_read_seq = 0;
 776             s->d1->next_handshake_write_seq = 0;
 777             dtls1_clear_received_buffer(s);
 778             goto end;
 779             /* break; */
 780
 781         case SSL_ST_ERR:
 782         default:
 783             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 784             ret = -1;
 785             goto end;
 786             /* break; */
 787         }
 788
 789         /* did we do anything */
 790         if (!s->s3->tmp.reuse_message && !skip) {
 791             if (s->debug) {
 792                 if ((ret = BIO_flush(s->wbio)) <= 0)
 793                     goto end;
 794             }
 795
 796             if ((cb != NULL) && (s->state != state)) {
 797                 new_state = s->state;
 798                 s->state = state;
 799                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 800                 s->state = new_state;
 801             }
 802         }
 803         skip = 0;
 804     }
 805  end:
 806     s->in_handshake--;
 807
 808 #ifndef OPENSSL_NO_SCTP
 809     /*
 810      * Notify SCTP BIO socket to leave handshake mode and allow stream
 811      * identifier other than 0. Will be ignored if no SCTP is used.
 812      */
 813     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 814              s->in_handshake, NULL);
 815 #endif
 816
 817     if (buf != NULL)
 818         BUF_MEM_free(buf);
 819     if (cb != NULL)
 820         cb(s, SSL_CB_CONNECT_EXIT, ret);
 821     return (ret);
 822 }
 823
 824 static int dtls1_get_hello_verify(SSL *s)
 825 {
 826     int n, al, ok = 0;
 827     unsigned char *data;
 828     unsigned int cookie_len;
 829
 830     s->first_packet = 1;
 831     n = s->method->ssl_get_message(s,
 832                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 833                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 834                                    -1, s->max_cert_list, &ok);
 835     s->first_packet = 0;
 836
 837     if (!ok)
 838         return ((int)n);
 839
 840     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 841         s->d1->send_cookie = 0;
 842         s->s3->tmp.reuse_message = 1;
 843         return (1);
 844     }
 845
 846     data = (unsigned char *)s->init_msg;
 847 #if 0
 848     if (s->method->version != DTLS_ANY_VERSION &&
 849         ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
 850     {
 851         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 852         s->version = (s->version & 0xff00) | data[1];
 853         al = SSL_AD_PROTOCOL_VERSION;
 854         goto f_err;
 855     }
 856 #endif
 857     data += 2;
 858
 859     cookie_len = *(data++);
 860     if (cookie_len > sizeof(s->d1->cookie)) {
 861         al = SSL_AD_ILLEGAL_PARAMETER;
 862         goto f_err;
 863     }
 864
 865     memcpy(s->d1->cookie, data, cookie_len);
 866     s->d1->cookie_len = cookie_len;
 867
 868     s->d1->send_cookie = 1;
 869     return 1;
 870
 871  f_err:
 872     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 873     s->state = SSL_ST_ERR;
 874     return -1;
 875 }