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                 } else
 386                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 387             }
 388             s->init_num = 0;
 389             break;
 390
 391         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 392         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 393
 394             ret = dtls1_get_hello_verify(s);
 395             if (ret <= 0)
 396                 goto end;
 397             dtls1_stop_timer(s);
 398             if (s->d1->send_cookie) /* start again, with a cookie */
 399                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 400             else
 401                 s->state = SSL3_ST_CR_CERT_A;
 402             s->init_num = 0;
 403             break;
 404
 405         case SSL3_ST_CR_CERT_A:
 406         case SSL3_ST_CR_CERT_B:
 407             /* Check if it is anon DH or PSK */
 408             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 409                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 410                 ret = ssl3_get_server_certificate(s);
 411                 if (ret <= 0)
 412                     goto end;
 413 #ifndef OPENSSL_NO_TLSEXT
 414                 if (s->tlsext_status_expected)
 415                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 416                 else
 417                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 418             } else {
 419                 skip = 1;
 420                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 421             }
 422 #else
 423             } else
 424                 skip = 1;
 425
 426             s->state = SSL3_ST_CR_KEY_EXCH_A;
 427 #endif
 428             s->init_num = 0;
 429             break;
 430
 431         case SSL3_ST_CR_KEY_EXCH_A:
 432         case SSL3_ST_CR_KEY_EXCH_B:
 433             ret = ssl3_get_key_exchange(s);
 434             if (ret <= 0)
 435                 goto end;
 436             s->state = SSL3_ST_CR_CERT_REQ_A;
 437             s->init_num = 0;
 438
 439             /*
 440              * at this point we check that we have the required stuff from
 441              * the server
 442              */
 443             if (!ssl3_check_cert_and_algorithm(s)) {
 444                 ret = -1;
 445                 s->state = SSL_ST_ERR;
 446                 goto end;
 447             }
 448             break;
 449
 450         case SSL3_ST_CR_CERT_REQ_A:
 451         case SSL3_ST_CR_CERT_REQ_B:
 452             ret = ssl3_get_certificate_request(s);
 453             if (ret <= 0)
 454                 goto end;
 455             s->state = SSL3_ST_CR_SRVR_DONE_A;
 456             s->init_num = 0;
 457             break;
 458
 459         case SSL3_ST_CR_SRVR_DONE_A:
 460         case SSL3_ST_CR_SRVR_DONE_B:
 461             ret = ssl3_get_server_done(s);
 462             if (ret <= 0)
 463                 goto end;
 464             dtls1_stop_timer(s);
 465             if (s->s3->tmp.cert_req)
 466                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 467             else
 468                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 469             s->init_num = 0;
 470
 471 #ifndef OPENSSL_NO_SCTP
 472             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 473                 state == SSL_ST_RENEGOTIATE)
 474                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 475             else
 476 #endif
 477                 s->state = s->s3->tmp.next_state;
 478             break;
 479
 480         case SSL3_ST_CW_CERT_A:
 481         case SSL3_ST_CW_CERT_B:
 482         case SSL3_ST_CW_CERT_C:
 483         case SSL3_ST_CW_CERT_D:
 484             dtls1_start_timer(s);
 485             ret = ssl3_send_client_certificate(s);
 486             if (ret <= 0)
 487                 goto end;
 488             s->state = SSL3_ST_CW_KEY_EXCH_A;
 489             s->init_num = 0;
 490             break;
 491
 492         case SSL3_ST_CW_KEY_EXCH_A:
 493         case SSL3_ST_CW_KEY_EXCH_B:
 494             dtls1_start_timer(s);
 495             ret = ssl3_send_client_key_exchange(s);
 496             if (ret <= 0)
 497                 goto end;
 498
 499 #ifndef OPENSSL_NO_SCTP
 500             /*
 501              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 502              * used.
 503              */
 504             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 505                      DTLS1_SCTP_AUTH_LABEL);
 506
 507             if (SSL_export_keying_material(s, sctpauthkey,
 508                                        sizeof(sctpauthkey), labelbuffer,
 509                                        sizeof(labelbuffer), NULL, 0, 0) <= 0) {
 510                 ret = -1;
 511                 s->state = SSL_ST_ERR;
 512                 goto end;
 513             }
 514
 515             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 516                      sizeof(sctpauthkey), sctpauthkey);
 517 #endif
 518
 519             /*
 520              * EAY EAY EAY need to check for DH fix cert sent back
 521              */
 522             /*
 523              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 524              * sent, but no verify packet is sent
 525              */
 526             if (s->s3->tmp.cert_req == 1) {
 527                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 528             } else {
 529 #ifndef OPENSSL_NO_SCTP
 530                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 531                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 532                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 533                 } else
 534 #endif
 535                     s->state = SSL3_ST_CW_CHANGE_A;
 536             }
 537
 538             s->init_num = 0;
 539             break;
 540
 541         case SSL3_ST_CW_CERT_VRFY_A:
 542         case SSL3_ST_CW_CERT_VRFY_B:
 543             dtls1_start_timer(s);
 544             ret = ssl3_send_client_verify(s);
 545             if (ret <= 0)
 546                 goto end;
 547 #ifndef OPENSSL_NO_SCTP
 548             if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 549                 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 550                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 551             } else
 552 #endif
 553                 s->state = SSL3_ST_CW_CHANGE_A;
 554             s->init_num = 0;
 555             break;
 556
 557         case SSL3_ST_CW_CHANGE_A:
 558         case SSL3_ST_CW_CHANGE_B:
 559             if (!s->hit)
 560                 dtls1_start_timer(s);
 561             ret = dtls1_send_change_cipher_spec(s,
 562                                                 SSL3_ST_CW_CHANGE_A,
 563                                                 SSL3_ST_CW_CHANGE_B);
 564             if (ret <= 0)
 565                 goto end;
 566
 567             s->state = SSL3_ST_CW_FINISHED_A;
 568             s->init_num = 0;
 569
 570             s->session->cipher = s->s3->tmp.new_cipher;
 571 #ifdef OPENSSL_NO_COMP
 572             s->session->compress_meth = 0;
 573 #else
 574             if (s->s3->tmp.new_compression == NULL)
 575                 s->session->compress_meth = 0;
 576             else
 577                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 578 #endif
 579             if (!s->method->ssl3_enc->setup_key_block(s)) {
 580                 ret = -1;
 581                 s->state = SSL_ST_ERR;
 582                 goto end;
 583             }
 584
 585             if (!s->method->ssl3_enc->change_cipher_state(s,
 586                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 587             {
 588                 ret = -1;
 589                 s->state = SSL_ST_ERR;
 590                 goto end;
 591             }
 592 #ifndef OPENSSL_NO_SCTP
 593             if (s->hit) {
 594                 /*
 595                  * Change to new shared key of SCTP-Auth, will be ignored if
 596                  * no SCTP used.
 597                  */
 598                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 599                          0, NULL);
 600             }
 601 #endif
 602
 603             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 604             break;
 605
 606         case SSL3_ST_CW_FINISHED_A:
 607         case SSL3_ST_CW_FINISHED_B:
 608             if (!s->hit)
 609                 dtls1_start_timer(s);
 610             ret = ssl3_send_finished(s,
 611                                      SSL3_ST_CW_FINISHED_A,
 612                                      SSL3_ST_CW_FINISHED_B,
 613                                      s->method->
 614                                      ssl3_enc->client_finished_label,
 615                                      s->method->
 616                                      ssl3_enc->client_finished_label_len);
 617             if (ret <= 0)
 618                 goto end;
 619             s->state = SSL3_ST_CW_FLUSH;
 620
 621             /* clear flags */
 622             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 623             if (s->hit) {
 624                 s->s3->tmp.next_state = SSL_ST_OK;
 625 #ifndef OPENSSL_NO_SCTP
 626                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 627                     s->d1->next_state = s->s3->tmp.next_state;
 628                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 629                 }
 630 #endif
 631                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 632                     s->state = SSL_ST_OK;
 633 #ifndef OPENSSL_NO_SCTP
 634                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 635                         s->d1->next_state = SSL_ST_OK;
 636                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 637                     }
 638 #endif
 639                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 640                     s->s3->delay_buf_pop_ret = 0;
 641                 }
 642             } else {
 643 #ifndef OPENSSL_NO_SCTP
 644                 /*
 645                  * Change to new shared key of SCTP-Auth, will be ignored if
 646                  * no SCTP used.
 647                  */
 648                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 649                          0, NULL);
 650 #endif
 651
 652 #ifndef OPENSSL_NO_TLSEXT
 653                 /*
 654                  * Allow NewSessionTicket if ticket expected
 655                  */
 656                 if (s->tlsext_ticket_expected)
 657                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 658                 else
 659 #endif
 660
 661                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 662             }
 663             s->init_num = 0;
 664             break;
 665
 666 #ifndef OPENSSL_NO_TLSEXT
 667         case SSL3_ST_CR_SESSION_TICKET_A:
 668         case SSL3_ST_CR_SESSION_TICKET_B:
 669             ret = ssl3_get_new_session_ticket(s);
 670             if (ret <= 0)
 671                 goto end;
 672             s->state = SSL3_ST_CR_FINISHED_A;
 673             s->init_num = 0;
 674             break;
 675
 676         case SSL3_ST_CR_CERT_STATUS_A:
 677         case SSL3_ST_CR_CERT_STATUS_B:
 678             ret = ssl3_get_cert_status(s);
 679             if (ret <= 0)
 680                 goto end;
 681             s->state = SSL3_ST_CR_KEY_EXCH_A;
 682             s->init_num = 0;
 683             break;
 684 #endif
 685
 686         case SSL3_ST_CR_FINISHED_A:
 687         case SSL3_ST_CR_FINISHED_B:
 688             s->d1->change_cipher_spec_ok = 1;
 689             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 690                                     SSL3_ST_CR_FINISHED_B);
 691             if (ret <= 0)
 692                 goto end;
 693             dtls1_stop_timer(s);
 694
 695             if (s->hit)
 696                 s->state = SSL3_ST_CW_CHANGE_A;
 697             else
 698                 s->state = SSL_ST_OK;
 699
 700 #ifndef OPENSSL_NO_SCTP
 701             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 702                 state == SSL_ST_RENEGOTIATE) {
 703                 s->d1->next_state = s->state;
 704                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 705             }
 706 #endif
 707
 708             s->init_num = 0;
 709             break;
 710
 711         case SSL3_ST_CW_FLUSH:
 712             s->rwstate = SSL_WRITING;
 713             if (BIO_flush(s->wbio) <= 0) {
 714                 /*
 715                  * If the write error was fatal, stop trying
 716                  */
 717                 if (!BIO_should_retry(s->wbio)) {
 718                     s->rwstate = SSL_NOTHING;
 719                     s->state = s->s3->tmp.next_state;
 720                 }
 721
 722                 ret = -1;
 723                 goto end;
 724             }
 725             s->rwstate = SSL_NOTHING;
 726             s->state = s->s3->tmp.next_state;
 727             break;
 728
 729         case SSL_ST_OK:
 730             /* clean a few things up */
 731             ssl3_cleanup_key_block(s);
 732
 733 #if 0
 734             if (s->init_buf != NULL) {
 735                 BUF_MEM_free(s->init_buf);
 736                 s->init_buf = NULL;
 737             }
 738 #endif
 739
 740             /*
 741              * If we are not 'joining' the last two packets, remove the
 742              * buffering now
 743              */
 744             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 745                 ssl_free_wbio_buffer(s);
 746             /* else do it later in ssl3_write */
 747
 748             s->init_num = 0;
 749             s->renegotiate = 0;
 750             s->new_session = 0;
 751
 752             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 753             if (s->hit)
 754                 s->ctx->stats.sess_hit++;
 755
 756             ret = 1;
 757             /* s->server=0; */
 758             s->handshake_func = dtls1_connect;
 759             s->ctx->stats.sess_connect_good++;
 760
 761             if (cb != NULL)
 762                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 763
 764             /* done with handshaking */
 765             s->d1->handshake_read_seq = 0;
 766             s->d1->next_handshake_write_seq = 0;
 767             goto end;
 768             /* break; */
 769
 770         case SSL_ST_ERR:
 771         default:
 772             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 773             ret = -1;
 774             goto end;
 775             /* break; */
 776         }
 777
 778         /* did we do anything */
 779         if (!s->s3->tmp.reuse_message && !skip) {
 780             if (s->debug) {
 781                 if ((ret = BIO_flush(s->wbio)) <= 0)
 782                     goto end;
 783             }
 784
 785             if ((cb != NULL) && (s->state != state)) {
 786                 new_state = s->state;
 787                 s->state = state;
 788                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 789                 s->state = new_state;
 790             }
 791         }
 792         skip = 0;
 793     }
 794  end:
 795     s->in_handshake--;
 796
 797 #ifndef OPENSSL_NO_SCTP
 798     /*
 799      * Notify SCTP BIO socket to leave handshake mode and allow stream
 800      * identifier other than 0. Will be ignored if no SCTP is used.
 801      */
 802     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 803              s->in_handshake, NULL);
 804 #endif
 805
 806     if (buf != NULL)
 807         BUF_MEM_free(buf);
 808     if (cb != NULL)
 809         cb(s, SSL_CB_CONNECT_EXIT, ret);
 810     return (ret);
 811 }
 812
 813 static int dtls1_get_hello_verify(SSL *s)
 814 {
 815     int n, al, ok = 0;
 816     unsigned char *data;
 817     unsigned int cookie_len;
 818
 819     s->first_packet = 1;
 820     n = s->method->ssl_get_message(s,
 821                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 822                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 823                                    -1, s->max_cert_list, &ok);
 824     s->first_packet = 0;
 825
 826     if (!ok)
 827         return ((int)n);
 828
 829     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 830         s->d1->send_cookie = 0;
 831         s->s3->tmp.reuse_message = 1;
 832         return (1);
 833     }
 834
 835     data = (unsigned char *)s->init_msg;
 836 #if 0
 837     if (s->method->version != DTLS_ANY_VERSION &&
 838         ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
 839     {
 840         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 841         s->version = (s->version & 0xff00) | data[1];
 842         al = SSL_AD_PROTOCOL_VERSION;
 843         goto f_err;
 844     }
 845 #endif
 846     data += 2;
 847
 848     cookie_len = *(data++);
 849     if (cookie_len > sizeof(s->d1->cookie)) {
 850         al = SSL_AD_ILLEGAL_PARAMETER;
 851         goto f_err;
 852     }
 853
 854     memcpy(s->d1->cookie, data, cookie_len);
 855     s->d1->cookie_len = cookie_len;
 856
 857     s->d1->send_cookie = 1;
 858     return 1;
 859
 860  f_err:
 861     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 862     s->state = SSL_ST_ERR;
 863     return -1;
 864 }