ssl/d1_clnt.c

   1 /* ssl/d1_clnt.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/md5.h>
 123 #include <openssl/bn.h>
 124 #ifndef OPENSSL_NO_DH
 125 # include <openssl/dh.h>
 126 #endif
 127
 128 static const SSL_METHOD *dtls1_get_client_method(int ver);
 129 #if 0
 130 static int dtls1_get_hello_verify(SSL *s);
 131 #endif
 132
 133 static const SSL_METHOD *dtls1_get_client_method(int ver)
 134 {
 135     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 136         return (DTLSv1_client_method());
 137     else if (ver == DTLS1_2_VERSION)
 138         return (DTLSv1_2_client_method());
 139     else
 140         return (NULL);
 141 }
 142
 143 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
 144                           DTLSv1_client_method,
 145                           ssl_undefined_function,
 146                           dtls1_connect,
 147                           dtls1_get_client_method, DTLSv1_enc_data)
 148
 149     IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
 150                           DTLSv1_2_client_method,
 151                           ssl_undefined_function,
 152                           dtls1_connect,
 153                           dtls1_get_client_method, DTLSv1_2_enc_data)
 154
 155     IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
 156                           DTLS_client_method,
 157                           ssl_undefined_function,
 158                           dtls1_connect,
 159                           dtls1_get_client_method, DTLSv1_2_enc_data)
 160
 161 #if 0
 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         if (!SSL_clear(s))
 186             return -1;
 187     }
 188
 189 #ifndef OPENSSL_NO_SCTP
 190     /*
 191      * Notify SCTP BIO socket to enter handshake mode and prevent stream
 192      * identifier other than 0. Will be ignored if no SCTP is used.
 193      */
 194     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 195              s->in_handshake, NULL);
 196 #endif
 197
 198 #ifndef OPENSSL_NO_HEARTBEATS
 199     /*
 200      * If we're awaiting a HeartbeatResponse, pretend we already got and
 201      * don't await it anymore, because Heartbeats don't make sense during
 202      * handshakes anyway.
 203      */
 204     if (s->tlsext_hb_pending) {
 205         dtls1_stop_timer(s);
 206         s->tlsext_hb_pending = 0;
 207         s->tlsext_hb_seq++;
 208     }
 209 #endif
 210
 211     for (;;) {
 212         state = s->state;
 213
 214         switch (s->state) {
 215         case SSL_ST_RENEGOTIATE:
 216             s->renegotiate = 1;
 217             s->state = SSL_ST_CONNECT;
 218             s->ctx->stats.sess_connect_renegotiate++;
 219             /* break */
 220         case SSL_ST_BEFORE:
 221         case SSL_ST_CONNECT:
 222         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 223         case SSL_ST_OK | SSL_ST_CONNECT:
 224
 225             s->server = 0;
 226             if (cb != NULL)
 227                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 228
 229             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 230                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 231                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 232                 ret = -1;
 233                 s->state = SSL_ST_ERR;
 234                 goto end;
 235             }
 236
 237             /* s->version=SSL3_VERSION; */
 238             s->type = SSL_ST_CONNECT;
 239
 240             if (s->init_buf == NULL) {
 241                 if ((buf = BUF_MEM_new()) == NULL) {
 242                     ret = -1;
 243                     s->state = SSL_ST_ERR;
 244                     goto end;
 245                 }
 246                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 247                     ret = -1;
 248                     s->state = SSL_ST_ERR;
 249                     goto end;
 250                 }
 251                 s->init_buf = buf;
 252                 buf = NULL;
 253             }
 254
 255             if (!ssl3_setup_buffers(s)) {
 256                 ret = -1;
 257                 s->state = SSL_ST_ERR;
 258                 goto end;
 259             }
 260
 261             /* setup buffing BIO */
 262             if (!ssl_init_wbio_buffer(s, 0)) {
 263                 ret = -1;
 264                 s->state = SSL_ST_ERR;
 265                 goto end;
 266             }
 267
 268             /* don't push the buffering BIO quite yet */
 269
 270             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 271             s->ctx->stats.sess_connect++;
 272             s->init_num = 0;
 273             /* mark client_random uninitialized */
 274             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 275             s->d1->send_cookie = 0;
 276             s->hit = 0;
 277             /*
 278              * Should have been reset by ssl3_get_finished, too.
 279              */
 280             s->s3->change_cipher_spec = 0;
 281             break;
 282
 283 #ifndef OPENSSL_NO_SCTP
 284         case DTLS1_SCTP_ST_CR_READ_SOCK:
 285
 286             if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
 287                 s->s3->in_read_app_data = 2;
 288                 s->rwstate = SSL_READING;
 289                 BIO_clear_retry_flags(SSL_get_rbio(s));
 290                 BIO_set_retry_read(SSL_get_rbio(s));
 291                 ret = -1;
 292                 goto end;
 293             }
 294
 295             s->state = s->s3->tmp.next_state;
 296             break;
 297
 298         case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 299             /* read app data until dry event */
 300
 301             ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 302             if (ret < 0)
 303                 goto end;
 304
 305             if (ret == 0) {
 306                 s->s3->in_read_app_data = 2;
 307                 s->rwstate = SSL_READING;
 308                 BIO_clear_retry_flags(SSL_get_rbio(s));
 309                 BIO_set_retry_read(SSL_get_rbio(s));
 310                 ret = -1;
 311                 goto end;
 312             }
 313
 314             s->state = s->d1->next_state;
 315             break;
 316 #endif
 317
 318         case SSL3_ST_CW_CLNT_HELLO_A:
 319         case SSL3_ST_CW_CLNT_HELLO_B:
 320
 321             s->shutdown = 0;
 322
 323             /* every DTLS ClientHello resets Finished MAC */
 324             ssl3_init_finished_mac(s);
 325
 326             dtls1_start_timer(s);
 327             ret = ssl3_client_hello(s);
 328             if (ret <= 0)
 329                 goto end;
 330
 331             if (s->d1->send_cookie) {
 332                 s->state = SSL3_ST_CW_FLUSH;
 333                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 334             } else
 335                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 336
 337             s->init_num = 0;
 338
 339 #ifndef OPENSSL_NO_SCTP
 340             /* Disable buffering for SCTP */
 341             if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 342 #endif
 343                 /*
 344                  * turn on buffering for the next lot of output
 345                  */
 346                 if (s->bbio != s->wbio)
 347                     s->wbio = BIO_push(s->bbio, s->wbio);
 348 #ifndef OPENSSL_NO_SCTP
 349             }
 350 #endif
 351
 352             break;
 353
 354         case SSL3_ST_CR_SRVR_HELLO_A:
 355         case SSL3_ST_CR_SRVR_HELLO_B:
 356             ret = ssl3_get_server_hello(s);
 357             if (ret <= 0)
 358                 goto end;
 359             else {
 360                 if (s->hit) {
 361 #ifndef OPENSSL_NO_SCTP
 362                     /*
 363                      * Add new shared key for SCTP-Auth, will be ignored if
 364                      * no SCTP used.
 365                      */
 366                     snprintf((char *)labelbuffer,
 367                              sizeof(DTLS1_SCTP_AUTH_LABEL),
 368                              DTLS1_SCTP_AUTH_LABEL);
 369
 370                     if (SSL_export_keying_material(s, sctpauthkey,
 371                                                sizeof(sctpauthkey),
 372                                                labelbuffer,
 373                                                sizeof(labelbuffer), NULL, 0,
 374                                                0) <= 0) {
 375                         ret = -1;
 376                         s->state = SSL_ST_ERR;
 377                         goto end;
 378                     }
 379
 380                     BIO_ctrl(SSL_get_wbio(s),
 381                              BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 382                              sizeof(sctpauthkey), sctpauthkey);
 383 #endif
 384
 385                     s->state = SSL3_ST_CR_CHANGE_A;
 386                     if (s->tlsext_ticket_expected) {
 387                         /* receive renewed session ticket */
 388                         s->state = SSL3_ST_CR_SESSION_TICKET_A;
 389                     }
 390                 } else
 391                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 392             }
 393             s->init_num = 0;
 394             break;
 395
 396         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 397         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 398
 399             ret = dtls1_get_hello_verify(s);
 400             if (ret <= 0)
 401                 goto end;
 402             dtls1_stop_timer(s);
 403             if (s->d1->send_cookie) /* start again, with a cookie */
 404                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 405             else
 406                 s->state = SSL3_ST_CR_CERT_A;
 407             s->init_num = 0;
 408             break;
 409
 410         case SSL3_ST_CR_CERT_A:
 411         case SSL3_ST_CR_CERT_B:
 412             /* Check if it is anon DH or PSK */
 413             if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 414                 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
 415                 ret = ssl3_get_server_certificate(s);
 416                 if (ret <= 0)
 417                     goto end;
 418
 419                 if (s->tlsext_status_expected)
 420                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 421                 else
 422                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 423             } else {
 424                 skip = 1;
 425                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 426             }
 427
 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             if (s->hit) {
 622                 s->s3->tmp.next_state = SSL_ST_OK;
 623 #ifndef OPENSSL_NO_SCTP
 624                 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
 625                     s->d1->next_state = s->s3->tmp.next_state;
 626                     s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 627                 }
 628 #endif
 629             } else {
 630 #ifndef OPENSSL_NO_SCTP
 631                 /*
 632                  * Change to new shared key of SCTP-Auth, will be ignored if
 633                  * no SCTP used.
 634                  */
 635                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
 636                          0, NULL);
 637 #endif
 638
 639                 /*
 640                  * Allow NewSessionTicket if ticket expected
 641                  */
 642                 if (s->tlsext_ticket_expected)
 643                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 644                 else
 645                     s->s3->tmp.next_state = SSL3_ST_CR_CHANGE_A;
 646             }
 647             s->init_num = 0;
 648             break;
 649
 650         case SSL3_ST_CR_SESSION_TICKET_A:
 651         case SSL3_ST_CR_SESSION_TICKET_B:
 652             ret = ssl3_get_new_session_ticket(s);
 653             if (ret <= 0)
 654                 goto end;
 655             s->state = SSL3_ST_CR_CHANGE_A;
 656             s->init_num = 0;
 657             break;
 658
 659         case SSL3_ST_CR_CERT_STATUS_A:
 660         case SSL3_ST_CR_CERT_STATUS_B:
 661             ret = ssl3_get_cert_status(s);
 662             if (ret <= 0)
 663                 goto end;
 664             s->state = SSL3_ST_CR_KEY_EXCH_A;
 665             s->init_num = 0;
 666             break;
 667
 668         case SSL3_ST_CR_CHANGE_A:
 669         case SSL3_ST_CR_CHANGE_B:
 670             ret = ssl3_get_change_cipher_spec(s, SSL3_ST_CR_CHANGE_A,
 671                                               SSL3_ST_CR_CHANGE_B);
 672             if (ret <= 0)
 673                 goto end;
 674
 675             s->state = SSL3_ST_CR_FINISHED_A;
 676             s->init_num = 0;
 677             break;
 678
 679         case SSL3_ST_CR_FINISHED_A:
 680         case SSL3_ST_CR_FINISHED_B:
 681             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 682                                     SSL3_ST_CR_FINISHED_B);
 683             if (ret <= 0)
 684                 goto end;
 685             dtls1_stop_timer(s);
 686
 687             if (s->hit)
 688                 s->state = SSL3_ST_CW_CHANGE_A;
 689             else
 690                 s->state = SSL_ST_OK;
 691
 692 #ifndef OPENSSL_NO_SCTP
 693             if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 694                 state == SSL_ST_RENEGOTIATE) {
 695                 s->d1->next_state = s->state;
 696                 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
 697             }
 698 #endif
 699
 700             s->init_num = 0;
 701             break;
 702
 703         case SSL3_ST_CW_FLUSH:
 704             s->rwstate = SSL_WRITING;
 705             if (BIO_flush(s->wbio) <= 0) {
 706                 /*
 707                  * If the write error was fatal, stop trying
 708                  */
 709                 if (!BIO_should_retry(s->wbio)) {
 710                     s->rwstate = SSL_NOTHING;
 711                     s->state = s->s3->tmp.next_state;
 712                 }
 713
 714                 ret = -1;
 715                 goto end;
 716             }
 717             s->rwstate = SSL_NOTHING;
 718             s->state = s->s3->tmp.next_state;
 719             break;
 720
 721         case SSL_ST_OK:
 722             /* clean a few things up */
 723             ssl3_cleanup_key_block(s);
 724
 725             /* Remove the buffering */
 726             ssl_free_wbio_buffer(s);
 727
 728             s->init_num = 0;
 729             s->renegotiate = 0;
 730             s->new_session = 0;
 731
 732             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 733             if (s->hit)
 734                 s->ctx->stats.sess_hit++;
 735
 736             ret = 1;
 737             /* s->server=0; */
 738             s->handshake_func = dtls1_connect;
 739             s->ctx->stats.sess_connect_good++;
 740
 741             if (cb != NULL)
 742                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 743
 744             /* done with handshaking */
 745             s->d1->handshake_read_seq = 0;
 746             s->d1->next_handshake_write_seq = 0;
 747             goto end;
 748             /* break; */
 749
 750         case SSL_ST_ERR:
 751         default:
 752             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 753             ret = -1;
 754             goto end;
 755             /* break; */
 756         }
 757
 758         /* did we do anything */
 759         if (!s->s3->tmp.reuse_message && !skip) {
 760             if (s->debug) {
 761                 if ((ret = BIO_flush(s->wbio)) <= 0)
 762                     goto end;
 763             }
 764
 765             if ((cb != NULL) && (s->state != state)) {
 766                 new_state = s->state;
 767                 s->state = state;
 768                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 769                 s->state = new_state;
 770             }
 771         }
 772         skip = 0;
 773     }
 774  end:
 775     s->in_handshake--;
 776
 777 #ifndef OPENSSL_NO_SCTP
 778     /*
 779      * Notify SCTP BIO socket to leave handshake mode and allow stream
 780      * identifier other than 0. Will be ignored if no SCTP is used.
 781      */
 782     BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
 783              s->in_handshake, NULL);
 784 #endif
 785
 786     BUF_MEM_free(buf);
 787     if (cb != NULL)
 788         cb(s, SSL_CB_CONNECT_EXIT, ret);
 789     return (ret);
 790 }
 791 #endif
 792
 793 #if 0
 794 static int dtls1_get_hello_verify(SSL *s)
 795 {
 796     int n, al, ok = 0;
 797     unsigned char *data;
 798     unsigned int cookie_len;
 799
 800     /* TODO: CHECK first_packet handling!!! */
 801     s->first_packet = 1;
 802     n = s->method->ssl_get_message(s,
 803                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 804                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 805                                    -1, s->max_cert_list, &ok);
 806     s->first_packet = 0;
 807
 808     if (!ok)
 809         return ((int)n);
 810 }
 811 #endif
 812
 813 enum MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, unsigned long n)
 814 {
 815     int al;
 816     unsigned char *data;
 817     unsigned int cookie_len;
 818
 819     data = (unsigned char *)s->init_msg;
 820     data += 2;
 821
 822     cookie_len = *(data++);
 823     if (cookie_len > sizeof(s->d1->cookie)) {
 824         al = SSL_AD_ILLEGAL_PARAMETER;
 825         goto f_err;
 826     }
 827
 828     memcpy(s->d1->cookie, data, cookie_len);
 829     s->d1->cookie_len = cookie_len;
 830
 831     return MSG_PROCESS_FINISHED_READING;
 832  f_err:
 833     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 834     statem_set_error(s);
 835     return MSG_PROCESS_ERROR;
 836 }