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                 goto end;
 232             }
 233
 234             /* s->version=SSL3_VERSION; */
 235             s->type = SSL_ST_CONNECT;
 236
 237             if (s->init_buf == NULL) {
 238                 if ((buf = BUF_MEM_new()) == NULL) {
 239                     ret = -1;
 240                     goto end;
 241                 }
 242                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 243                     ret = -1;
 244                     goto end;
 245                 }
 246                 s->init_buf = buf;
 247                 buf = NULL;
 248             }
 249
 250             if (!ssl3_setup_buffers(s)) {
 251                 ret = -1;
 252                 goto end;
 253             }
 254
 255             /* setup buffing BIO */
 256             if (!ssl_init_wbio_buffer(s, 0)) {
 257                 ret = -1;
 258                 goto end;
 259             }
 260
 261             /* don't push the buffering BIO quite yet */
 262
 263             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 264             s->ctx->stats.sess_connect++;
 265             s->init_num = 0;
 266             /* mark client_random uninitialized */
 267             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 268             s->d1->send_cookie = 0;
 269             s->hit = 0;
 270             s->d1->change_cipher_spec_ok = 0;
 271             /*
 272              * Should have been reset by ssl3_get_finished, too.
 273              */
 274             s->s3->change_cipher_spec = 0;
 275             break;
 276
 277 #ifndef OPENSSL_NO_SCTP
 278         case DTLS1_SCTP_ST_CR_READ_SOCK:
 279
 280             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 281                 s->s3->in_read_app_data = 2;
 282                 s->rwstate = SSL_READING;
 283                 BIO_clear_retry_flags(SSL_get_rbio(s));
 284                 BIO_set_retry_read(SSL_get_rbio(s));
 285                 ret = -1;
 286                 goto end;
 287             }
 288
 289             s->state = s->s3->tmp.next_state;
 290             break;
 291
 292         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 293             /* read app data until dry event */
 294
 295             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 296             if (ret < 0)
 297                 goto end;
 298
 299             if (ret == 0) {
 300                 s->s3->in_read_app_data = 2;
 301                 s->rwstate = SSL_READING;
 302                 BIO_clear_retry_flags(SSL_get_rbio(s));
 303                 BIO_set_retry_read(SSL_get_rbio(s));
 304                 ret = -1;
 305                 goto end;
 306             }
 307
 308             s->state = s->d1->next_state;
 309             break;
 310 #endif
 311
 312         case SSL3_ST_CW_CLNT_HELLO_A:
 313         case SSL3_ST_CW_CLNT_HELLO_B:
 314
 315             s->shutdown = 0;
 316
 317             /* every DTLS ClientHello resets Finished MAC */
 318             ssl3_init_finished_mac(s);
 319
 320             dtls1_start_timer(s);
 321             ret = ssl3_client_hello(s);
 322             if (ret <= 0)
 323                 goto end;
 324
 325             if (s->d1->send_cookie) {
 326                 s->state = SSL3_ST_CW_FLUSH;
 327                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 328             } else
 329                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 330
 331             s->init_num = 0;
 332
 333 #ifndef OPENSSL_NO_SCTP
 334             /* Disable buffering for SCTP */
 335             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 336 #endif
 337                 /*
 338                  * turn on buffering for the next lot of output
 339                  */
 340                 if (s->bbio != s->wbio)
 341                     s->wbio = BIO_push(s->bbio, s->wbio);
 342 #ifndef OPENSSL_NO_SCTP
 343             }
 344 #endif
 345
 346             break;
 347
 348         case SSL3_ST_CR_SRVR_HELLO_A:
 349         case SSL3_ST_CR_SRVR_HELLO_B:
 350             ret = ssl3_get_server_hello(s);
 351             if (ret <= 0)
 352                 goto end;
 353             else {
 354                 if (s->hit) {
 355 #ifndef OPENSSL_NO_SCTP
 356                     /*
 357                      * Add new shared key for SCTP-Auth, will be ignored if
 358                      * no SCTP used.
 359                      */
 360                     snprintf((char *)labelbuffer,
 361                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 362                              DTLS1_SCTP_AUTH_LABEL);
 363
 364                     SSL_export_keying_material(s, sctpauthkey,
 365                                                sizeof(sctpauthkey),
 366                                                labelbuffer,
 367                                                sizeof(labelbuffer), NULL, 0,
 368                                                0);
 369
 370                     BIO_ctrl(SSL_get_wbio(s),
 371                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 372                              sizeof(sctpauthkey), sctpauthkey);
 373 #endif
 374
 375                     s->state = SSL3_ST_CR_FINISHED_A;
 376                 } else
 377                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 378             }
 379             s->init_num = 0;
 380             break;
 381
 382         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 383         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 384
 385             ret = dtls1_get_hello_verify(s);
 386             if (ret <= 0)
 387                 goto end;
 388             dtls1_stop_timer(s);
 389             if (s->d1->send_cookie) /* start again, with a cookie */
 390                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 391             else
 392                 s->state = SSL3_ST_CR_CERT_A;
 393             s->init_num = 0;
 394             break;
 395
 396         case SSL3_ST_CR_CERT_A:
 397         case SSL3_ST_CR_CERT_B:
 398             /* Check if it is anon DH or PSK */
 399             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 400                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 401                 ret = ssl3_get_server_certificate(s);
 402                 if (ret <= 0)
 403                     goto end;
 404 #ifndef OPENSSL_NO_TLSEXT
 405                 if (s->tlsext_status_expected)
 406                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 407                 else
 408                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 409             } else {
 410                 skip = 1;
 411                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 412             }
 413 #else
 414             } else
 415                 skip = 1;
 416
 417             s->state = SSL3_ST_CR_KEY_EXCH_A;
 418 #endif
 419             s->init_num = 0;
 420             break;
 421
 422         case SSL3_ST_CR_KEY_EXCH_A:
 423         case SSL3_ST_CR_KEY_EXCH_B:
 424             ret = ssl3_get_key_exchange(s);
 425             if (ret <= 0)
 426                 goto end;
 427             s->state = SSL3_ST_CR_CERT_REQ_A;
 428             s->init_num = 0;
 429
 430             /*
 431              * at this point we check that we have the required stuff from
 432              * the server
 433              */
 434             if (!ssl3_check_cert_and_algorithm(s)) {
 435                 ret = -1;
 436                 goto end;
 437             }
 438             break;
 439
 440         case SSL3_ST_CR_CERT_REQ_A:
 441         case SSL3_ST_CR_CERT_REQ_B:
 442             ret = ssl3_get_certificate_request(s);
 443             if (ret <= 0)
 444                 goto end;
 445             s->state = SSL3_ST_CR_SRVR_DONE_A;
 446             s->init_num = 0;
 447             break;
 448
 449         case SSL3_ST_CR_SRVR_DONE_A:
 450         case SSL3_ST_CR_SRVR_DONE_B:
 451             ret = ssl3_get_server_done(s);
 452             if (ret <= 0)
 453                 goto end;
 454             dtls1_stop_timer(s);
 455             if (s->s3->tmp.cert_req)
 456                 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
 457             else
 458                 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 459             s->init_num = 0;
 460
 461 #ifndef OPENSSL_NO_SCTP
 462             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 463                 state == SSL_ST_RENEGOTIATE)
 464                 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
 465             else
 466 #endif
 467                 s->state = s->s3->tmp.next_state;
 468             break;
 469
 470         case SSL3_ST_CW_CERT_A:
 471         case SSL3_ST_CW_CERT_B:
 472         case SSL3_ST_CW_CERT_C:
 473         case SSL3_ST_CW_CERT_D:
 474             dtls1_start_timer(s);
 475             ret = ssl3_send_client_certificate(s);
 476             if (ret <= 0)
 477                 goto end;
 478             s->state = SSL3_ST_CW_KEY_EXCH_A;
 479             s->init_num = 0;
 480             break;
 481
 482         case SSL3_ST_CW_KEY_EXCH_A:
 483         case SSL3_ST_CW_KEY_EXCH_B:
 484             dtls1_start_timer(s);
 485             ret = ssl3_send_client_key_exchange(s);
 486             if (ret <= 0)
 487                 goto end;
 488
 489 #ifndef OPENSSL_NO_SCTP
 490             /*
 491              * Add new shared key for SCTP-Auth, will be ignored if no SCTP
 492              * used.
 493              */
 494             snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 495                      DTLS1_SCTP_AUTH_LABEL);
 496
 497             SSL_export_keying_material(s, sctpauthkey,
 498                                        sizeof(sctpauthkey), labelbuffer,
 499                                        sizeof(labelbuffer), NULL, 0, 0);
 500
 501             BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 502                      sizeof(sctpauthkey), sctpauthkey);
 503 #endif
 504
 505             /*
 506              * EAY EAY EAY need to check for DH fix cert sent back
 507              */
 508             /*
 509              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 510              * sent, but no verify packet is sent
 511              */
 512             if (s->s3->tmp.cert_req == 1) {
 513                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 514             } else {
 515 #ifndef OPENSSL_NO_SCTP
 516                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 517                     s->d1->next_state = SSL3_ST_CW_CHANGE_A;
 518                     s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 519                 } else
 520 #endif
 521                     s->state = SSL3_ST_CW_CHANGE_A;
 522             }
 523
 524             s->init_num = 0;
 525             break;
 526
 527         case SSL3_ST_CW_CERT_VRFY_A:
 528         case SSL3_ST_CW_CERT_VRFY_B:
 529             dtls1_start_timer(s);
 530             ret = ssl3_send_client_verify(s);
 531             if (ret <= 0)
 532                 goto end;
 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             s->init_num = 0;
 541             break;
 542
 543         case SSL3_ST_CW_CHANGE_A:
 544         case SSL3_ST_CW_CHANGE_B:
 545             if (!s->hit)
 546                 dtls1_start_timer(s);
 547             ret = dtls1_send_change_cipher_spec(s,
 548                                                 SSL3_ST_CW_CHANGE_A,
 549                                                 SSL3_ST_CW_CHANGE_B);
 550             if (ret <= 0)
 551                 goto end;
 552
 553             s->state = SSL3_ST_CW_FINISHED_A;
 554             s->init_num = 0;
 555
 556             s->session->cipher = s->s3->tmp.new_cipher;
 557 #ifdef OPENSSL_NO_COMP
 558             s->session->compress_meth = 0;
 559 #else
 560             if (s->s3->tmp.new_compression == NULL)
 561                 s->session->compress_meth = 0;
 562             else
 563                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 564 #endif
 565             if (!s->method->ssl3_enc->setup_key_block(s)) {
 566                 ret = -1;
 567                 goto end;
 568             }
 569
 570             if (!s->method->ssl3_enc->change_cipher_state(s,
 571                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 572             {
 573                 ret = -1;
 574                 goto end;
 575             }
 576 #ifndef OPENSSL_NO_SCTP
 577             if (s->hit) {
 578                 /*
 579                  * Change to new shared key of SCTP-Auth, will be ignored if
 580                  * no SCTP used.
 581                  */
 582                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 583                          0, NULL);
 584             }
 585 #endif
 586
 587             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 588             break;
 589
 590         case SSL3_ST_CW_FINISHED_A:
 591         case SSL3_ST_CW_FINISHED_B:
 592             if (!s->hit)
 593                 dtls1_start_timer(s);
 594             ret = ssl3_send_finished(s,
 595                                      SSL3_ST_CW_FINISHED_A,
 596                                      SSL3_ST_CW_FINISHED_B,
 597                                      s->method->
 598                                      ssl3_enc->client_finished_label,
 599                                      s->method->
 600                                      ssl3_enc->client_finished_label_len);
 601             if (ret <= 0)
 602                 goto end;
 603             s->state = SSL3_ST_CW_FLUSH;
 604
 605             /* clear flags */
 606             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 607             if (s->hit) {
 608                 s->s3->tmp.next_state = SSL_ST_OK;
 609 #ifndef OPENSSL_NO_SCTP
 610                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 611                     s->d1->next_state = s->s3->tmp.next_state;
 612                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 613                 }
 614 #endif
 615                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 616                     s->state = SSL_ST_OK;
 617 #ifndef OPENSSL_NO_SCTP
 618                     if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 619                         s->d1->next_state = SSL_ST_OK;
 620                         s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 621                     }
 622 #endif
 623                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 624                     s->s3->delay_buf_pop_ret = 0;
 625                 }
 626             } else {
 627 #ifndef OPENSSL_NO_SCTP
 628                 /*
 629                  * Change to new shared key of SCTP-Auth, will be ignored if
 630                  * no SCTP used.
 631                  */
 632                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 633                          0, NULL);
 634 #endif
 635
 636 #ifndef OPENSSL_NO_TLSEXT
 637                 /*
 638                  * Allow NewSessionTicket if ticket expected
 639                  */
 640                 if (s->tlsext_ticket_expected)
 641                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 642                 else
 643 #endif
 644
 645                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 646             }
 647             s->init_num = 0;
 648             break;
 649
 650 #ifndef OPENSSL_NO_TLSEXT
 651         case SSL3_ST_CR_SESSION_TICKET_A:
 652         case SSL3_ST_CR_SESSION_TICKET_B:
 653             ret = ssl3_get_new_session_ticket(s);
 654             if (ret <= 0)
 655                 goto end;
 656             s->state = SSL3_ST_CR_FINISHED_A;
 657             s->init_num = 0;
 658             break;
 659
 660         case SSL3_ST_CR_CERT_STATUS_A:
 661         case SSL3_ST_CR_CERT_STATUS_B:
 662             ret = ssl3_get_cert_status(s);
 663             if (ret <= 0)
 664                 goto end;
 665             s->state = SSL3_ST_CR_KEY_EXCH_A;
 666             s->init_num = 0;
 667             break;
 668 #endif
 669
 670         case SSL3_ST_CR_FINISHED_A:
 671         case SSL3_ST_CR_FINISHED_B:
 672             s->d1->change_cipher_spec_ok = 1;
 673             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 674                                     SSL3_ST_CR_FINISHED_B);
 675             if (ret <= 0)
 676                 goto end;
 677             dtls1_stop_timer(s);
 678
 679             if (s->hit)
 680                 s->state = SSL3_ST_CW_CHANGE_A;
 681             else
 682                 s->state = SSL_ST_OK;
 683
 684 #ifndef OPENSSL_NO_SCTP
 685             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 686                 state == SSL_ST_RENEGOTIATE) {
 687                 s->d1->next_state = s->state;
 688                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 689             }
 690 #endif
 691
 692             s->init_num = 0;
 693             break;
 694
 695         case SSL3_ST_CW_FLUSH:
 696             s->rwstate = SSL_WRITING;
 697             if (BIO_flush(s->wbio) <= 0) {
 698                 /*
 699                  * If the write error was fatal, stop trying
 700                  */
 701                 if (!BIO_should_retry(s->wbio)) {
 702                     s->rwstate = SSL_NOTHING;
 703                     s->state = s->s3->tmp.next_state;
 704                 }
 705
 706                 ret = -1;
 707                 goto end;
 708             }
 709             s->rwstate = SSL_NOTHING;
 710             s->state = s->s3->tmp.next_state;
 711             break;
 712
 713         case SSL_ST_OK:
 714             /* clean a few things up */
 715             ssl3_cleanup_key_block(s);
 716
 717 #if 0
 718             if (s->init_buf != NULL) {
 719                 BUF_MEM_free(s->init_buf);
 720                 s->init_buf = NULL;
 721             }
 722 #endif
 723
 724             /*
 725              * If we are not 'joining' the last two packets, remove the
 726              * buffering now
 727              */
 728             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 729                 ssl_free_wbio_buffer(s);
 730             /* else do it later in ssl3_write */
 731
 732             s->init_num = 0;
 733             s->renegotiate = 0;
 734             s->new_session = 0;
 735
 736             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 737             if (s->hit)
 738                 s->ctx->stats.sess_hit++;
 739
 740             ret = 1;
 741             /* s->server=0; */
 742             s->handshake_func = dtls1_connect;
 743             s->ctx->stats.sess_connect_good++;
 744
 745             if (cb != NULL)
 746                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 747
 748             /* done with handshaking */
 749             s->d1->handshake_read_seq = 0;
 750             s->d1->next_handshake_write_seq = 0;
 751             goto end;
 752             /* break; */
 753
 754         default:
 755             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 756             ret = -1;
 757             goto end;
 758             /* break; */
 759         }
 760
 761         /* did we do anything */
 762         if (!s->s3->tmp.reuse_message && !skip) {
 763             if (s->debug) {
 764                 if ((ret = BIO_flush(s->wbio)) <= 0)
 765                     goto end;
 766             }
 767
 768             if ((cb != NULL) && (s->state != state)) {
 769                 new_state = s->state;
 770                 s->state = state;
 771                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 772                 s->state = new_state;
 773             }
 774         }
 775         skip = 0;
 776     }
 777  end:
 778     s->in_handshake--;
 779
 780 #ifndef OPENSSL_NO_SCTP
 781     /*
 782      * Notify SCTP BIO socket to leave handshake mode and allow stream
 783      * identifier other than 0. Will be ignored if no SCTP is used.
 784      */
 785     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 786              s->in_handshake, NULL);
 787 #endif
 788
 789     if (buf != NULL)
 790         BUF_MEM_free(buf);
 791     if (cb != NULL)
 792         cb(s, SSL_CB_CONNECT_EXIT, ret);
 793     return (ret);
 794 }
 795
 796 static int dtls1_get_hello_verify(SSL *s)
 797 {
 798     int n, al, ok = 0;
 799     unsigned char *data;
 800     unsigned int cookie_len;
 801
 802     s->first_packet = 1;
 803     n = s->method->ssl_get_message(s,
 804                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 805                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 806                                    -1, s->max_cert_list, &ok);
 807     s->first_packet = 0;
 808
 809     if (!ok)
 810         return ((int)n);
 811
 812     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 813         s->d1->send_cookie = 0;
 814         s->s3->tmp.reuse_message = 1;
 815         return (1);
 816     }
 817
 818     data = (unsigned char *)s->init_msg;
 819 #if 0
 820     if (s->method->version != DTLS_ANY_VERSION &&
 821         ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
 822     {
 823         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 824         s->version = (s->version & 0xff00) | data[1];
 825         al = SSL_AD_PROTOCOL_VERSION;
 826         goto f_err;
 827     }
 828 #endif
 829     data += 2;
 830
 831     cookie_len = *(data++);
 832     if (cookie_len > sizeof(s->d1->cookie)) {
 833         al = SSL_AD_ILLEGAL_PARAMETER;
 834         goto f_err;
 835     }
 836
 837     memcpy(s->d1->cookie, data, cookie_len);
 838     s->d1->cookie_len = cookie_len;
 839
 840     s->d1->send_cookie = 1;
 841     return 1;
 842
 843  f_err:
 844     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 845     return -1;
 846 }