lib/libssl/d1_clnt.c

   1 /* $OpenBSD: d1_clnt.c,v 1.74 2017/02/07 02:08:38 beck Exp $ */
   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 <limits.h>
 117 #include <stdio.h>
 118
 119 #include "ssl_locl.h"
 120
 121 #include <openssl/bn.h>
 122 #include <openssl/buffer.h>
 123 #include <openssl/dh.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/objects.h>
 127
 128 #include "bytestring.h"
 129
 130 static int dtls1_get_hello_verify(SSL *s);
 131
 132 static const SSL_METHOD_INTERNAL DTLSv1_client_method_internal_data = {
 133         .version = DTLS1_VERSION,
 134         .min_version = DTLS1_VERSION,
 135         .max_version = DTLS1_VERSION,
 136         .ssl_new = dtls1_new,
 137         .ssl_clear = dtls1_clear,
 138         .ssl_free = dtls1_free,
 139         .ssl_accept = ssl_undefined_function,
 140         .ssl_connect = dtls1_connect,
 141         .ssl_read = ssl3_read,
 142         .ssl_peek = ssl3_peek,
 143         .ssl_write = ssl3_write,
 144         .ssl_shutdown = dtls1_shutdown,
 145         .ssl_pending = ssl3_pending,
 146         .get_ssl_method = dtls1_get_client_method,
 147         .get_timeout = dtls1_default_timeout,
 148         .ssl_version = ssl_undefined_void_function,
 149         .ssl_renegotiate = ssl3_renegotiate,
 150         .ssl_renegotiate_check = ssl3_renegotiate_check,
 151         .ssl_get_message = dtls1_get_message,
 152         .ssl_read_bytes = dtls1_read_bytes,
 153         .ssl_write_bytes = dtls1_write_app_data_bytes,
 154         .ssl3_enc = &DTLSv1_enc_data,
 155 };
 156
 157 static const SSL_METHOD DTLSv1_client_method_data = {
 158         .ssl_dispatch_alert = dtls1_dispatch_alert,
 159         .num_ciphers = ssl3_num_ciphers,
 160         .get_cipher = dtls1_get_cipher,
 161         .get_cipher_by_char = ssl3_get_cipher_by_char,
 162         .put_cipher_by_char = ssl3_put_cipher_by_char,
 163         .internal = &DTLSv1_client_method_internal_data,
 164 };
 165
 166 const SSL_METHOD *
 167 DTLSv1_client_method(void)
 168 {
 169         return &DTLSv1_client_method_data;
 170 }
 171
 172 const SSL_METHOD *
 173 dtls1_get_client_method(int ver)
 174 {
 175         if (ver == DTLS1_VERSION)
 176                 return (DTLSv1_client_method());
 177         return (NULL);
 178 }
 179
 180 int
 181 dtls1_connect(SSL *s)
 182 {
 183         void (*cb)(const SSL *ssl, int type, int val) = NULL;
 184         int ret = -1;
 185         int new_state, state, skip = 0;
 186
 187         ERR_clear_error();
 188         errno = 0;
 189
 190         if (s->internal->info_callback != NULL)
 191                 cb = s->internal->info_callback;
 192         else if (s->ctx->internal->info_callback != NULL)
 193                 cb = s->ctx->internal->info_callback;
 194
 195         s->internal->in_handshake++;
 196         if (!SSL_in_init(s) || SSL_in_before(s))
 197                 SSL_clear(s);
 198
 199
 200         for (;;) {
 201                 state = s->internal->state;
 202
 203                 switch (s->internal->state) {
 204                 case SSL_ST_RENEGOTIATE:
 205                         s->internal->renegotiate = 1;
 206                         s->internal->state = SSL_ST_CONNECT;
 207                         s->ctx->internal->stats.sess_connect_renegotiate++;
 208                         /* break */
 209                 case SSL_ST_BEFORE:
 210                 case SSL_ST_CONNECT:
 211                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 212                 case SSL_ST_OK|SSL_ST_CONNECT:
 213
 214                         s->server = 0;
 215                         if (cb != NULL)
 216                                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 217
 218                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00)) {
 219                                 SSLerror(s, ERR_R_INTERNAL_ERROR);
 220                                 ret = -1;
 221                                 goto end;
 222                         }
 223
 224                         /* s->version=SSL3_VERSION; */
 225                         s->internal->type = SSL_ST_CONNECT;
 226
 227                         if (!ssl3_setup_init_buffer(s)) {
 228                                 ret = -1;
 229                                 goto end;
 230                         }
 231                         if (!ssl3_setup_buffers(s)) {
 232                                 ret = -1;
 233                                 goto end;
 234                         }
 235                         if (!ssl_init_wbio_buffer(s, 0)) {
 236                                 ret = -1;
 237                                 goto end;
 238                         }
 239
 240                         /* don't push the buffering BIO quite yet */
 241
 242                         s->internal->state = SSL3_ST_CW_CLNT_HELLO_A;
 243                         s->ctx->internal->stats.sess_connect++;
 244                         s->internal->init_num = 0;
 245                         /* mark client_random uninitialized */
 246                         memset(s->s3->client_random, 0,
 247                             sizeof(s->s3->client_random));
 248                         D1I(s)->send_cookie = 0;
 249                         s->internal->hit = 0;
 250                         break;
 251
 252
 253                 case SSL3_ST_CW_CLNT_HELLO_A:
 254                 case SSL3_ST_CW_CLNT_HELLO_B:
 255
 256                         s->internal->shutdown = 0;
 257
 258                         /* every DTLS ClientHello resets Finished MAC */
 259                         if (!tls1_init_finished_mac(s)) {
 260                                 ret = -1;
 261                                 goto end;
 262                         }
 263
 264                         dtls1_start_timer(s);
 265                         ret = ssl3_client_hello(s);
 266                         if (ret <= 0)
 267                                 goto end;
 268
 269                         if (D1I(s)->send_cookie) {
 270                                 s->internal->state = SSL3_ST_CW_FLUSH;
 271                                 S3I(s)->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 272                         } else
 273                                 s->internal->state = SSL3_ST_CR_SRVR_HELLO_A;
 274
 275                         s->internal->init_num = 0;
 276
 277                         /* turn on buffering for the next lot of output */
 278                         if (s->bbio != s->wbio)
 279                                 s->wbio = BIO_push(s->bbio, s->wbio);
 280
 281                         break;
 282
 283                 case SSL3_ST_CR_SRVR_HELLO_A:
 284                 case SSL3_ST_CR_SRVR_HELLO_B:
 285                         ret = ssl3_get_server_hello(s);
 286                         if (ret <= 0)
 287                                 goto end;
 288                         else {
 289                                 if (s->internal->hit) {
 290
 291                                         s->internal->state = SSL3_ST_CR_FINISHED_A;
 292                                 } else
 293                                         s->internal->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 294                         }
 295                         s->internal->init_num = 0;
 296                         break;
 297
 298                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 299                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 300
 301                         ret = dtls1_get_hello_verify(s);
 302                         if (ret <= 0)
 303                                 goto end;
 304                         dtls1_stop_timer(s);
 305                         if ( D1I(s)->send_cookie) /* start again, with a cookie */
 306                                 s->internal->state = SSL3_ST_CW_CLNT_HELLO_A;
 307                         else
 308                                 s->internal->state = SSL3_ST_CR_CERT_A;
 309                         s->internal->init_num = 0;
 310                         break;
 311
 312                 case SSL3_ST_CR_CERT_A:
 313                 case SSL3_ST_CR_CERT_B:
 314                         ret = ssl3_check_finished(s);
 315                         if (ret <= 0)
 316                                 goto end;
 317                         if (ret == 2) {
 318                                 s->internal->hit = 1;
 319                                 if (s->internal->tlsext_ticket_expected)
 320                                         s->internal->state = SSL3_ST_CR_SESSION_TICKET_A;
 321                                 else
 322                                         s->internal->state = SSL3_ST_CR_FINISHED_A;
 323                                 s->internal->init_num = 0;
 324                                 break;
 325                         }
 326                         /* Check if it is anon DH. */
 327                         if (!(S3I(s)->tmp.new_cipher->algorithm_auth &
 328                             SSL_aNULL)) {
 329                                 ret = ssl3_get_server_certificate(s);
 330                                 if (ret <= 0)
 331                                         goto end;
 332                                 if (s->internal->tlsext_status_expected)
 333                                         s->internal->state = SSL3_ST_CR_CERT_STATUS_A;
 334                                 else
 335                                         s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
 336                         } else {
 337                                 skip = 1;
 338                                 s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
 339                         }
 340                         s->internal->init_num = 0;
 341                         break;
 342
 343                 case SSL3_ST_CR_KEY_EXCH_A:
 344                 case SSL3_ST_CR_KEY_EXCH_B:
 345                         ret = ssl3_get_server_key_exchange(s);
 346                         if (ret <= 0)
 347                                 goto end;
 348                         s->internal->state = SSL3_ST_CR_CERT_REQ_A;
 349                         s->internal->init_num = 0;
 350
 351                         /* at this point we check that we have the
 352                          * required stuff from the server */
 353                         if (!ssl3_check_cert_and_algorithm(s)) {
 354                                 ret = -1;
 355                                 goto end;
 356                         }
 357                         break;
 358
 359                 case SSL3_ST_CR_CERT_REQ_A:
 360                 case SSL3_ST_CR_CERT_REQ_B:
 361                         ret = ssl3_get_certificate_request(s);
 362                         if (ret <= 0)
 363                                 goto end;
 364                         s->internal->state = SSL3_ST_CR_SRVR_DONE_A;
 365                         s->internal->init_num = 0;
 366                         break;
 367
 368                 case SSL3_ST_CR_SRVR_DONE_A:
 369                 case SSL3_ST_CR_SRVR_DONE_B:
 370                         ret = ssl3_get_server_done(s);
 371                         if (ret <= 0)
 372                                 goto end;
 373                         dtls1_stop_timer(s);
 374                         if (S3I(s)->tmp.cert_req)
 375                                 S3I(s)->tmp.next_state = SSL3_ST_CW_CERT_A;
 376                         else
 377                                 S3I(s)->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
 378                         s->internal->init_num = 0;
 379                         s->internal->state = S3I(s)->tmp.next_state;
 380                         break;
 381
 382                 case SSL3_ST_CW_CERT_A:
 383                 case SSL3_ST_CW_CERT_B:
 384                 case SSL3_ST_CW_CERT_C:
 385                 case SSL3_ST_CW_CERT_D:
 386                         dtls1_start_timer(s);
 387                         ret = ssl3_send_client_certificate(s);
 388                         if (ret <= 0)
 389                                 goto end;
 390                         s->internal->state = SSL3_ST_CW_KEY_EXCH_A;
 391                         s->internal->init_num = 0;
 392                         break;
 393
 394                 case SSL3_ST_CW_KEY_EXCH_A:
 395                 case SSL3_ST_CW_KEY_EXCH_B:
 396                         dtls1_start_timer(s);
 397                         ret = ssl3_send_client_key_exchange(s);
 398                         if (ret <= 0)
 399                                 goto end;
 400
 401                         /* EAY EAY EAY need to check for DH fix cert
 402                          * sent back */
 403                         /* For TLS, cert_req is set to 2, so a cert chain
 404                          * of nothing is sent, but no verify packet is sent */
 405                         if (S3I(s)->tmp.cert_req == 1) {
 406                                 s->internal->state = SSL3_ST_CW_CERT_VRFY_A;
 407                         } else {
 408                                 s->internal->state = SSL3_ST_CW_CHANGE_A;
 409                                 S3I(s)->change_cipher_spec = 0;
 410                         }
 411
 412                         s->internal->init_num = 0;
 413                         break;
 414
 415                 case SSL3_ST_CW_CERT_VRFY_A:
 416                 case SSL3_ST_CW_CERT_VRFY_B:
 417                         dtls1_start_timer(s);
 418                         ret = ssl3_send_client_verify(s);
 419                         if (ret <= 0)
 420                                 goto end;
 421                         s->internal->state = SSL3_ST_CW_CHANGE_A;
 422                         s->internal->init_num = 0;
 423                         S3I(s)->change_cipher_spec = 0;
 424                         break;
 425
 426                 case SSL3_ST_CW_CHANGE_A:
 427                 case SSL3_ST_CW_CHANGE_B:
 428                         if (!s->internal->hit)
 429                                 dtls1_start_timer(s);
 430                         ret = dtls1_send_change_cipher_spec(s,
 431                             SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B);
 432                         if (ret <= 0)
 433                                 goto end;
 434
 435                         s->internal->state = SSL3_ST_CW_FINISHED_A;
 436                         s->internal->init_num = 0;
 437
 438                         s->session->cipher = S3I(s)->tmp.new_cipher;
 439                         if (!tls1_setup_key_block(s)) {
 440                                 ret = -1;
 441                                 goto end;
 442                         }
 443
 444                         if (!tls1_change_cipher_state(s,
 445                             SSL3_CHANGE_CIPHER_CLIENT_WRITE)) {
 446                                 ret = -1;
 447                                 goto end;
 448                         }
 449
 450
 451                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 452                         break;
 453
 454                 case SSL3_ST_CW_FINISHED_A:
 455                 case SSL3_ST_CW_FINISHED_B:
 456                         if (!s->internal->hit)
 457                                 dtls1_start_timer(s);
 458                         ret = ssl3_send_finished(s,
 459                             SSL3_ST_CW_FINISHED_A, SSL3_ST_CW_FINISHED_B,
 460                             TLS_MD_CLIENT_FINISH_CONST,
 461                             TLS_MD_CLIENT_FINISH_CONST_SIZE);
 462                         if (ret <= 0)
 463                                 goto end;
 464                         s->internal->state = SSL3_ST_CW_FLUSH;
 465
 466                         /* clear flags */
 467                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 468                         if (s->internal->hit) {
 469                                 S3I(s)->tmp.next_state = SSL_ST_OK;
 470                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 471                                         s->internal->state = SSL_ST_OK;
 472                                         s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 473                                         S3I(s)->delay_buf_pop_ret = 0;
 474                                 }
 475                         } else {
 476
 477                                 /* Allow NewSessionTicket if ticket expected */
 478                                 if (s->internal->tlsext_ticket_expected)
 479                                         S3I(s)->tmp.next_state =
 480                                             SSL3_ST_CR_SESSION_TICKET_A;
 481                                 else
 482                                         S3I(s)->tmp.next_state =
 483                                             SSL3_ST_CR_FINISHED_A;
 484                         }
 485                         s->internal->init_num = 0;
 486                         break;
 487
 488                 case SSL3_ST_CR_SESSION_TICKET_A:
 489                 case SSL3_ST_CR_SESSION_TICKET_B:
 490                         ret = ssl3_get_new_session_ticket(s);
 491                         if (ret <= 0)
 492                                 goto end;
 493                         s->internal->state = SSL3_ST_CR_FINISHED_A;
 494                         s->internal->init_num = 0;
 495                         break;
 496
 497                 case SSL3_ST_CR_CERT_STATUS_A:
 498                 case SSL3_ST_CR_CERT_STATUS_B:
 499                         ret = ssl3_get_cert_status(s);
 500                         if (ret <= 0)
 501                                 goto end;
 502                         s->internal->state = SSL3_ST_CR_KEY_EXCH_A;
 503                         s->internal->init_num = 0;
 504                         break;
 505
 506                 case SSL3_ST_CR_FINISHED_A:
 507                 case SSL3_ST_CR_FINISHED_B:
 508                         D1I(s)->change_cipher_spec_ok = 1;
 509                         ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 510                             SSL3_ST_CR_FINISHED_B);
 511                         if (ret <= 0)
 512                                 goto end;
 513                         dtls1_stop_timer(s);
 514
 515                         if (s->internal->hit)
 516                                 s->internal->state = SSL3_ST_CW_CHANGE_A;
 517                         else
 518                                 s->internal->state = SSL_ST_OK;
 519
 520
 521                         s->internal->init_num = 0;
 522                         break;
 523
 524                 case SSL3_ST_CW_FLUSH:
 525                         s->internal->rwstate = SSL_WRITING;
 526                         if (BIO_flush(s->wbio) <= 0) {
 527                                 /* If the write error was fatal, stop trying */
 528                                 if (!BIO_should_retry(s->wbio)) {
 529                                         s->internal->rwstate = SSL_NOTHING;
 530                                         s->internal->state = S3I(s)->tmp.next_state;
 531                                 }
 532
 533                                 ret = -1;
 534                                 goto end;
 535                         }
 536                         s->internal->rwstate = SSL_NOTHING;
 537                         s->internal->state = S3I(s)->tmp.next_state;
 538                         break;
 539
 540                 case SSL_ST_OK:
 541                         /* clean a few things up */
 542                         tls1_cleanup_key_block(s);
 543
 544                         /* If we are not 'joining' the last two packets,
 545                          * remove the buffering now */
 546                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 547                                 ssl_free_wbio_buffer(s);
 548                         /* else do it later in ssl3_write */
 549
 550                         s->internal->init_num = 0;
 551                         s->internal->renegotiate = 0;
 552                         s->internal->new_session = 0;
 553
 554                         ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 555                         if (s->internal->hit)
 556                                 s->ctx->internal->stats.sess_hit++;
 557
 558                         ret = 1;
 559                         /* s->server=0; */
 560                         s->internal->handshake_func = dtls1_connect;
 561                         s->ctx->internal->stats.sess_connect_good++;
 562
 563                         if (cb != NULL)
 564                                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 565
 566                         /* done with handshaking */
 567                         D1I(s)->handshake_read_seq = 0;
 568                         D1I(s)->next_handshake_write_seq = 0;
 569                         goto end;
 570                         /* break; */
 571
 572                 default:
 573                         SSLerror(s, SSL_R_UNKNOWN_STATE);
 574                         ret = -1;
 575                         goto end;
 576                         /* break; */
 577                 }
 578
 579                 /* did we do anything */
 580                 if (!S3I(s)->tmp.reuse_message && !skip) {
 581                         if (s->internal->debug) {
 582                                 if ((ret = BIO_flush(s->wbio)) <= 0)
 583                                         goto end;
 584                         }
 585
 586                         if ((cb != NULL) && (s->internal->state != state)) {
 587                                 new_state = s->internal->state;
 588                                 s->internal->state = state;
 589                                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 590                                 s->internal->state = new_state;
 591                         }
 592                 }
 593                 skip = 0;
 594         }
 595
 596 end:
 597         s->internal->in_handshake--;
 598         if (cb != NULL)
 599                 cb(s, SSL_CB_CONNECT_EXIT, ret);
 600
 601         return (ret);
 602 }
 603
 604 static int
 605 dtls1_get_hello_verify(SSL *s)
 606 {
 607         long n;
 608         int al, ok = 0;
 609         size_t cookie_len;
 610         uint16_t ssl_version;
 611         CBS hello_verify_request, cookie;
 612
 613         n = s->method->internal->ssl_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 614             DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok);
 615
 616         if (!ok)
 617                 return ((int)n);
 618
 619         if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 620                 D1I(s)->send_cookie = 0;
 621                 S3I(s)->tmp.reuse_message = 1;
 622                 return (1);
 623         }
 624
 625         if (n < 0)
 626                 goto truncated;
 627
 628         CBS_init(&hello_verify_request, s->internal->init_msg, n);
 629
 630         if (!CBS_get_u16(&hello_verify_request, &ssl_version))
 631                 goto truncated;
 632
 633         if (ssl_version != s->version) {
 634                 SSLerror(s, SSL_R_WRONG_SSL_VERSION);
 635                 s->version = (s->version & 0xff00) | (ssl_version & 0xff);
 636                 al = SSL_AD_PROTOCOL_VERSION;
 637                 goto f_err;
 638         }
 639
 640         if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie))
 641                 goto truncated;
 642
 643         if (!CBS_write_bytes(&cookie, D1I(s)->cookie,
 644             sizeof(D1I(s)->cookie), &cookie_len)) {
 645                 D1I(s)->cookie_len = 0;
 646                 al = SSL_AD_ILLEGAL_PARAMETER;
 647                 goto f_err;
 648         }
 649         D1I(s)->cookie_len = cookie_len;
 650         D1I(s)->send_cookie = 1;
 651
 652         return 1;
 653
 654 truncated:
 655         al = SSL_AD_DECODE_ERROR;
 656 f_err:
 657         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 658         return -1;
 659 }