ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #ifndef OPENSSL_NO_KRB5
 119 # include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 # include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135 {
 136     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137         return (DTLSv1_client_method());
 138     else if (ver == DTLS1_2_VERSION)
 139         return (DTLSv1_2_client_method());
 140     else
 141         return (NULL);
 142 }
 143
 144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 145                           DTLSv1_client_method,
 146                           ssl_undefined_function,
 147                           dtls1_connect,
 148                           dtls1_get_client_method, DTLSv1_enc_data)
 149
 150     IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 151                           DTLSv1_2_client_method,
 152                           ssl_undefined_function,
 153                           dtls1_connect,
 154                           dtls1_get_client_method, DTLSv1_2_enc_data)
 155
 156     IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 157                           DTLS_client_method,
 158                           ssl_undefined_function,
 159                           dtls1_connect,
 160                           dtls1_get_client_method, DTLSv1_2_enc_data)
 161
 162 int dtls1_connect(SSL *s)
 163 {
 164     BUF_MEM *buf = NULL;
 165     unsigned long Time = (unsigned long)time(NULL);
 166     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 167     int ret = -1;
 168     int new_state, state, skip = 0;
 169 #ifndef OPENSSL_NO_SCTP
 170     unsigned char sctpauthkey[64];
 171     char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 172 #endif
 173
 174     RAND_add(&Time, sizeof(Time), 0);
 175     ERR_clear_error();
 176     clear_sys_error();
 177
 178     if (s->info_callback != NULL)
 179         cb = s->info_callback;
 180     else if (s->ctx->info_callback != NULL)
 181         cb = s->ctx->info_callback;
 182
 183     s->in_handshake++;
 184     if (!SSL_in_init(s) || SSL_in_before(s))
 185         SSL_clear(s);
 186
 187 #ifndef OPENSSL_NO_SCTP
 188     /*
 189      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 190      * identifier other than 0. Will be ignored if no SCTP is used.
 191      */
 192     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 193              s->in_handshake, NULL);
 194 #endif
 195
 196 #ifndef OPENSSL_NO_HEARTBEATS
 197     /*
 198      * If we're awaiting a HeartbeatResponse, pretend we already got and
 199      * don't await it anymore, because Heartbeats don't make sense during
 200      * handshakes anyway.
 201      */
 202     if (s->tlsext_hb_pending) {
 203         dtls1_stop_timer(s);
 204         s->tlsext_hb_pending = 0;
 205         s->tlsext_hb_seq++;
 206     }
 207 #endif
 208
 209     for (;;) {
 210         state = s->state;
 211
 212         switch (s->state) {
 213         case SSL_ST_RENEGOTIATE:
 214             s->renegotiate = 1;
 215             s->state = SSL_ST_CONNECT;
 216             s->ctx->stats.sess_connect_renegotiate++;
 217             /* break */
 218         case SSL_ST_BEFORE:
 219         case SSL_ST_CONNECT:
 220         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 221         case SSL_ST_OK | SSL_ST_CONNECT:
 222
 223             s->server = 0;
 224             if (cb != NULL)
 225                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 226
 227             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 228                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 229                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 230                 ret = -1;
 231                 s->state = SSL_ST_ERR;
 232                 goto end;
 233             }
 234
 235             /* s->version=SSL3_VERSION; */
 236             s->type = SSL_ST_CONNECT;
 237
 238             if (s->init_buf == NULL) {
 239                 if ((buf = BUF_MEM_new()) == NULL) {
 240                     ret = -1;
 241                     s->state = SSL_ST_ERR;
 242                     goto end;
 243                 }
 244                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 245                     ret = -1;
 246                     s->state = SSL_ST_ERR;
 247                     goto end;
 248                 }
 249                 s->init_buf = buf;
 250                 buf = NULL;
 251             }
 252
 253             if (!ssl3_setup_buffers(s)) {
 254                 ret = -1;
 255                 s->state = SSL_ST_ERR;
 256                 goto end;
 257             }
 258
 259             /* setup buffing BIO */
 260             if (!ssl_init_wbio_buffer(s, 0)) {
 261                 ret = -1;
 262                 s->state = SSL_ST_ERR;
 263                 goto end;
 264             }
 265
 266             /* don't push the buffering BIO quite yet */
 267
 268             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 269             s->ctx->stats.sess_connect++;
 270             s->init_num = 0;
 271             /* mark client_random uninitialized */
 272             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 273             s->d1->send_cookie = 0;
 274             s->hit = 0;
 275             s->d1->change_cipher_spec_ok = 0;
 276             /*
 277              * Should have been reset by ssl3_get_finished, too.
 278              */
 279             s->s3->change_cipher_spec = 0;
 280             break;
 281
 282 #ifndef OPENSSL_NO_SCTP
 283         case DTLS1_SCTP_ST_CR_READ_SOCK:
 284
 285             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 286                 s->s3->in_read_app_data = 2;
 287                 s->rwstate = SSL_READING;
 288                 BIO_clear_retry_flags(SSL_get_rbio(s));
 289                 BIO_set_retry_read(SSL_get_rbio(s));
 290                 ret = -1;
 291                 goto end;
 292             }
 293
 294             s->state = s->s3->tmp.next_state;
 295             break;
 296
 297         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 298             /* read app data until dry event */
 299
 300             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 301             if (ret < 0)
 302                 goto end;
 303
 304             if (ret == 0) {
 305                 s->s3->in_read_app_data = 2;
 306                 s->rwstate = SSL_READING;
 307                 BIO_clear_retry_flags(SSL_get_rbio(s));
 308                 BIO_set_retry_read(SSL_get_rbio(s));
 309                 ret = -1;
 310                 goto end;
 311             }
 312
 313             s->state = s->d1->next_state;
 314             break;
 315 #endif
 316
 317         case SSL3_ST_CW_CLNT_HELLO_A:
 318         case SSL3_ST_CW_CLNT_HELLO_B:
 319
 320             s->shutdown = 0;
 321
 322             /* every DTLS ClientHello resets Finished MAC */
 323             ssl3_init_finished_mac(s);
 324
 325             dtls1_start_timer(s);
 326             ret = ssl3_client_hello(s);
 327             if (ret <= 0)
 328                 goto end;
 329
 330             if (s->d1->send_cookie) {
 331                 s->state = SSL3_ST_CW_FLUSH;
 332                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 333             } else
 334                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 335
 336             s->init_num = 0;
 337
 338 #ifndef OPENSSL_NO_SCTP
 339             /* Disable buffering for SCTP */
 340             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 341 #endif
 342                 /*
 343                  * turn on buffering for the next lot of output
 344                  */
 345                 if (s->bbio != s->wbio)
 346                     s->wbio = BIO_push(s->bbio, s->wbio);
 347 #ifndef OPENSSL_NO_SCTP
 348             }
 349 #endif
 350
 351             break;
 352
 353         case SSL3_ST_CR_SRVR_HELLO_A:
 354         case SSL3_ST_CR_SRVR_HELLO_B:
 355             ret = ssl3_get_server_hello(s);
 356             if (ret <= 0)
 357                 goto end;
 358             else {
 359                 if (s->hit) {
 360 #ifndef OPENSSL_NO_SCTP
 361                     /*
 362                      * Add new shared key for SCTP-Auth, will be ignored if
 363                      * no SCTP used.
 364                      */
 365                     snprintf((char *)labelbuffer,
 366                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 367                              DTLS1_SCTP_AUTH_LABEL);
 368
 369                     if (SSL_export_keying_material(s, sctpauthkey,
 370                                                sizeof(sctpauthkey),
 371                                                labelbuffer,
 372                                                sizeof(labelbuffer), NULL, 0,
 373                                                0) <= 0) {
 374                         ret = -1;
 375                         s->state = SSL_ST_ERR;
 376                         goto end;
 377                     }
 378
 379                     BIO_ctrl(SSL_get_wbio(s),
 380                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 381                              sizeof(sctpauthkey), sctpauthkey);
 382 #endif
 383
 384                     s->state = SSL3_ST_CR_FINISHED_A;
 385                     if (s->tlsext_ticket_expected) {
 386                         /* receive renewed session ticket */
 387                         s->state = SSL3_ST_CR_SESSION_TICKET_A;
 388                     }
 389                 } else
 390                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 391             }
 392             s->init_num = 0;
 393             break;
 394
 395         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 396         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 397
 398             ret = dtls1_get_hello_verify(s);
 399             if (ret <= 0)
 400                 goto end;
 401             dtls1_stop_timer(s);
 402             if (s->d1->send_cookie) /* start again, with a cookie */
 403                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 404             else
 405                 s->state = SSL3_ST_CR_CERT_A;
 406             s->init_num = 0;
 407             break;
 408
 409         case SSL3_ST_CR_CERT_A:
 410         case SSL3_ST_CR_CERT_B:
 411             /* Check if it is anon DH or PSK */
 412             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 413                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 414                 ret = ssl3_get_server_certificate(s);
 415                 if (ret <= 0)
 416                     goto end;
 417 #ifndef OPENSSL_NO_TLSEXT
 418                 if (s->tlsext_status_expected)
 419                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 420                 else
 421                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 422             } else {
 423                 skip = 1;
 424                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 425             }
 426 #else
 427             } else
 428                 skip = 1;
 429
 430             s->state = SSL3_ST_CR_KEY_EXCH_A;
 431 #endif
 432             s->init_num = 0;
 433             break;
 434
 435         case SSL3_ST_CR_KEY_EXCH_A:
 436         case SSL3_ST_CR_KEY_EXCH_B:
 437             ret = ssl3_get_key_exchange(s);
 438             if (ret <= 0)
 439                 goto end;
 440             s->state = SSL3_ST_CR_CERT_REQ_A;
 441             s->init_num = 0;
 442
 443             /*
 444              * at this point we check that we have the required stuff from
 445              * the server
 446              */
 447             if (!ssl3_check_cert_and_algorithm(s)) {
 448                 ret = -1;
 449                 s->state = SSL_ST_ERR;
 450                 goto end;
 451             }
 452             break;
 453
 454         case SSL3_ST_CR_CERT_REQ_A:
 455         case SSL3_ST_CR_CERT_REQ_B:
 456             ret = ssl3_get_certificate_request(s);
 457             if (ret <= 0)
 458                 goto end;
 459             s->state = SSL3_ST_CR_SRVR_DONE_A;
 460             s->init_num = 0;
 461             break;
 462
 463         case SSL3_ST_CR_SRVR_DONE_A:
 464         case SSL3_ST_CR_SRVR_DONE_B:
 465             ret = ssl3_get_server_done(s);
 466             if (ret <= 0)
 467                 goto end;
 468             dtls1_stop_timer(s);
 469             if (s->s3->tmp.cert_req)
 470                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 471             else
 472                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 473             s->init_num = 0;
 474
 475 #ifndef OPENSSL_NO_SCTP
 476             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 477                 state == SSL_ST_RENEGOTIATE)
 478                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 479             else
 480 #endif
 481                 s->state = s->s3->tmp.next_state;
 482             break;
 483
 484         case SSL3_ST_CW_CERT_A:
 485         case SSL3_ST_CW_CERT_B:
 486         case SSL3_ST_CW_CERT_C:
 487         case SSL3_ST_CW_CERT_D:
 488             dtls1_start_timer(s);
 489             ret = ssl3_send_client_certificate(s);
 490             if (ret <= 0)
 491                 goto end;
 492             s->state = SSL3_ST_CW_KEY_EXCH_A;
 493             s->init_num = 0;
 494             break;
 495
 496         case SSL3_ST_CW_KEY_EXCH_A:
 497         case SSL3_ST_CW_KEY_EXCH_B:
 498             dtls1_start_timer(s);
 499             ret = ssl3_send_client_key_exchange(s);
 500             if (ret <= 0)
 501                 goto end;
 502
 503 #ifndef OPENSSL_NO_SCTP
 504             /*
 505              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 506              * used.
 507              */
 508             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 509                      DTLS1_SCTP_AUTH_LABEL);
 510
 511             if (SSL_export_keying_material(s, sctpauthkey,
 512                                        sizeof(sctpauthkey), labelbuffer,
 513                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 514                 ret = -1;
 515                 s->state = SSL_ST_ERR;
 516                 goto end;
 517             }
 518
 519             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 520                      sizeof(sctpauthkey), sctpauthkey);
 521 #endif
 522
 523             /*
 524              * EAY EAY EAY need to check for DH fix cert sent back
 525              */
 526             /*
 527              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 528              * sent, but no verify packet is sent
 529              */
 530             if (s->s3->tmp.cert_req == 1) {
 531                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 532             } else {
 533 #ifndef OPENSSL_NO_SCTP
 534                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 535                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 536                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 537                 } else
 538 #endif
 539                     s->state = SSL3_ST_CW_CHANGE_A;
 540             }
 541
 542             s->init_num = 0;
 543             break;
 544
 545         case SSL3_ST_CW_CERT_VRFY_A:
 546         case SSL3_ST_CW_CERT_VRFY_B:
 547             dtls1_start_timer(s);
 548             ret = ssl3_send_client_verify(s);
 549             if (ret <= 0)
 550                 goto end;
 551 #ifndef OPENSSL_NO_SCTP
 552             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 553                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 554                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 555             } else
 556 #endif
 557                 s->state = SSL3_ST_CW_CHANGE_A;
 558             s->init_num = 0;
 559             break;
 560
 561         case SSL3_ST_CW_CHANGE_A:
 562         case SSL3_ST_CW_CHANGE_B:
 563             if (!s->hit)
 564                 dtls1_start_timer(s);
 565             ret = dtls1_send_change_cipher_spec(s,
 566                                                 SSL3_ST_CW_CHANGE_A,
 567                                                 SSL3_ST_CW_CHANGE_B);
 568             if (ret <= 0)
 569                 goto end;
 570
 571             s->state = SSL3_ST_CW_FINISHED_A;
 572             s->init_num = 0;
 573
 574             s->session->cipher = s->s3->tmp.new_cipher;
 575 #ifdef OPENSSL_NO_COMP
 576             s->session->compress_meth = 0;
 577 #else
 578             if (s->s3->tmp.new_compression == NULL)
 579                 s->session->compress_meth = 0;
 580             else
 581                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 582 #endif
 583             if (!s->method->ssl3_enc->setup_key_block(s)) {
 584                 ret = -1;
 585                 s->state = SSL_ST_ERR;
 586                 goto end;
 587             }
 588
 589             if (!s->method->ssl3_enc->change_cipher_state(s,
 590                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 591             {
 592                 ret = -1;
 593                 s->state = SSL_ST_ERR;
 594                 goto end;
 595             }
 596 #ifndef OPENSSL_NO_SCTP
 597             if (s->hit) {
 598                 /*
 599                  * Change to new shared key of SCTP-Auth, will be ignored if
 600                  * no SCTP used.
 601                  */
 602                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 603                          0, NULL);
 604             }
 605 #endif
 606
 607             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 608             break;
 609
 610         case SSL3_ST_CW_FINISHED_A:
 611         case SSL3_ST_CW_FINISHED_B:
 612             if (!s->hit)
 613                 dtls1_start_timer(s);
 614             ret = ssl3_send_finished(s,
 615                                      SSL3_ST_CW_FINISHED_A,
 616                                      SSL3_ST_CW_FINISHED_B,
 617                                      s->method->
 618                                      ssl3_enc->client_finished_label,
 619                                      s->method->
 620                                      ssl3_enc->client_finished_label_len);
 621             if (ret <= 0)
 622                 goto end;
 623             s->state = SSL3_ST_CW_FLUSH;
 624
 625             /* clear flags */
 626             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 627             if (s->hit) {
 628                 s->s3->tmp.next_state = SSL_ST_OK;
 629 #ifndef OPENSSL_NO_SCTP
 630                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 631                     s->d1->next_state = s->s3->tmp.next_state;
 632                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 633                 }
 634 #endif
 635                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 636                     s->state = SSL_ST_OK;
 637 #ifndef OPENSSL_NO_SCTP
 638                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 639                         s->d1->next_state = SSL_ST_OK;
 640                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 641                     }
 642 #endif
 643                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 644                     s->s3->delay_buf_pop_ret = 0;
 645                 }
 646             } else {
 647 #ifndef OPENSSL_NO_SCTP
 648                 /*
 649                  * Change to new shared key of SCTP-Auth, will be ignored if
 650                  * no SCTP used.
 651                  */
 652                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 653                          0, NULL);
 654 #endif
 655
 656 #ifndef OPENSSL_NO_TLSEXT
 657                 /*
 658                  * Allow NewSessionTicket if ticket expected
 659                  */
 660                 if (s->tlsext_ticket_expected)
 661                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 662                 else
 663 #endif
 664
 665                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 666             }
 667             s->init_num = 0;
 668             break;
 669
 670 #ifndef OPENSSL_NO_TLSEXT
 671         case SSL3_ST_CR_SESSION_TICKET_A:
 672         case SSL3_ST_CR_SESSION_TICKET_B:
 673             ret = ssl3_get_new_session_ticket(s);
 674             if (ret <= 0)
 675                 goto end;
 676             s->state = SSL3_ST_CR_FINISHED_A;
 677             s->init_num = 0;
 678             break;
 679
 680         case SSL3_ST_CR_CERT_STATUS_A:
 681         case SSL3_ST_CR_CERT_STATUS_B:
 682             ret = ssl3_get_cert_status(s);
 683             if (ret <= 0)
 684                 goto end;
 685             s->state = SSL3_ST_CR_KEY_EXCH_A;
 686             s->init_num = 0;
 687             break;
 688 #endif
 689
 690         case SSL3_ST_CR_FINISHED_A:
 691         case SSL3_ST_CR_FINISHED_B:
 692             s->d1->change_cipher_spec_ok = 1;
 693             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 694                                     SSL3_ST_CR_FINISHED_B);
 695             if (ret <= 0)
 696                 goto end;
 697             dtls1_stop_timer(s);
 698
 699             if (s->hit)
 700                 s->state = SSL3_ST_CW_CHANGE_A;
 701             else
 702                 s->state = SSL_ST_OK;
 703
 704 #ifndef OPENSSL_NO_SCTP
 705             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 706                 state == SSL_ST_RENEGOTIATE) {
 707                 s->d1->next_state = s->state;
 708                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 709             }
 710 #endif
 711
 712             s->init_num = 0;
 713             break;
 714
 715         case SSL3_ST_CW_FLUSH:
 716             s->rwstate = SSL_WRITING;
 717             if (BIO_flush(s->wbio) <= 0) {
 718                 /*
 719                  * If the write error was fatal, stop trying
 720                  */
 721                 if (!BIO_should_retry(s->wbio)) {
 722                     s->rwstate = SSL_NOTHING;
 723                     s->state = s->s3->tmp.next_state;
 724                 }
 725
 726                 ret = -1;
 727                 goto end;
 728             }
 729             s->rwstate = SSL_NOTHING;
 730             s->state = s->s3->tmp.next_state;
 731             break;
 732
 733         case SSL_ST_OK:
 734             /* clean a few things up */
 735             ssl3_cleanup_key_block(s);
 736
 737 #if 0
 738             if (s->init_buf != NULL) {
 739                 BUF_MEM_free(s->init_buf);
 740                 s->init_buf = NULL;
 741             }
 742 #endif
 743
 744             /*
 745              * If we are not 'joining' the last two packets, remove the
 746              * buffering now
 747              */
 748             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 749                 ssl_free_wbio_buffer(s);
 750             /* else do it later in ssl3_write */
 751
 752             s->init_num = 0;
 753             s->renegotiate = 0;
 754             s->new_session = 0;
 755
 756             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 757             if (s->hit)
 758                 s->ctx->stats.sess_hit++;
 759
 760             ret = 1;
 761             /* s->server=0; */
 762             s->handshake_func = dtls1_connect;
 763             s->ctx->stats.sess_connect_good++;
 764
 765             if (cb != NULL)
 766                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 767
 768             /* done with handshaking */
 769             s->d1->handshake_read_seq = 0;
 770             s->d1->next_handshake_write_seq = 0;
 771             goto end;
 772             /* break; */
 773
 774         case SSL_ST_ERR:
 775         default:
 776             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 777             ret = -1;
 778             goto end;
 779             /* break; */
 780         }
 781
 782         /* did we do anything */
 783         if (!s->s3->tmp.reuse_message && !skip) {
 784             if (s->debug) {
 785                 if ((ret = BIO_flush(s->wbio)) <= 0)
 786                     goto end;
 787             }
 788
 789             if ((cb != NULL) && (s->state != state)) {
 790                 new_state = s->state;
 791                 s->state = state;
 792                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 793                 s->state = new_state;
 794             }
 795         }
 796         skip = 0;
 797     }
 798  end:
 799     s->in_handshake--;
 800
 801 #ifndef OPENSSL_NO_SCTP
 802     /*
 803      * Notify SCTP BIO socket to leave handshake mode and allow stream
 804      * identifier other than 0. Will be ignored if no SCTP is used.
 805      */
 806     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 807              s->in_handshake, NULL);
 808 #endif
 809
 810     if (buf != NULL)
 811         BUF_MEM_free(buf);
 812     if (cb != NULL)
 813         cb(s, SSL_CB_CONNECT_EXIT, ret);
 814     return (ret);
 815 }
 816
 817 static int dtls1_get_hello_verify(SSL *s)
 818 {
 819     int n, al, ok = 0;
 820     unsigned char *data;
 821     unsigned int cookie_len;
 822
 823     s->first_packet = 1;
 824     n = s->method->ssl_get_message(s,
 825                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 826                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 827                                    -1, s->max_cert_list, &ok);
 828     s->first_packet = 0;
 829
 830     if (!ok)
 831         return ((int)n);
 832
 833     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 834         s->d1->send_cookie = 0;
 835         s->s3->tmp.reuse_message = 1;
 836         return (1);
 837     }
 838
 839     data = (unsigned char *)s->init_msg;
 840 #if 0
 841     if (s->method->version != DTLS_ANY_VERSION &&
 842         ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
 843     {
 844         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 845         s->version = (s->version & 0xff00) | data[1];
 846         al = SSL_AD_PROTOCOL_VERSION;
 847         goto f_err;
 848     }
 849 #endif
 850     data += 2;
 851
 852     cookie_len = *(data++);
 853     if (cookie_len > sizeof(s->d1->cookie)) {
 854         al = SSL_AD_ILLEGAL_PARAMETER;
 855         goto f_err;
 856     }
 857
 858     memcpy(s->d1->cookie, data, cookie_len);
 859     s->d1->cookie_len = cookie_len;
 860
 861     s->d1->send_cookie = 1;
 862     return 1;
 863
 864  f_err:
 865     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 866     s->state = SSL_ST_ERR;
 867     return -1;
 868 }