crypto/openssl/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) 1999-2005 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 "kssl_lcl.h"
 119 #include <openssl/buffer.h>
 120 #include <openssl/rand.h>
 121 #include <openssl/objects.h>
 122 #include <openssl/evp.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 # include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_client_method(int ver);
 129 static int dtls1_get_hello_verify(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_client_method(int ver)
 132 {
 133     if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 134         return (DTLSv1_client_method());
 135     else
 136         return (NULL);
 137 }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 140                           ssl_undefined_function,
 141                           dtls1_connect, dtls1_get_client_method)
 142
 143 int dtls1_connect(SSL *s)
 144 {
 145     BUF_MEM *buf = NULL;
 146     unsigned long Time = (unsigned long)time(NULL);
 147     void (*cb) (const SSL *ssl, int type, int val) = NULL;
 148     int ret = -1;
 149     int new_state, state, skip = 0;;
 150
 151     RAND_add(&Time, sizeof(Time), 0);
 152     ERR_clear_error();
 153     clear_sys_error();
 154
 155     if (s->info_callback != NULL)
 156         cb = s->info_callback;
 157     else if (s->ctx->info_callback != NULL)
 158         cb = s->ctx->info_callback;
 159
 160     s->in_handshake++;
 161     if (!SSL_in_init(s) || SSL_in_before(s))
 162         SSL_clear(s);
 163
 164     for (;;) {
 165         state = s->state;
 166
 167         switch (s->state) {
 168         case SSL_ST_RENEGOTIATE:
 169             s->new_session = 1;
 170             s->state = SSL_ST_CONNECT;
 171             s->ctx->stats.sess_connect_renegotiate++;
 172             /* break */
 173         case SSL_ST_BEFORE:
 174         case SSL_ST_CONNECT:
 175         case SSL_ST_BEFORE | SSL_ST_CONNECT:
 176         case SSL_ST_OK | SSL_ST_CONNECT:
 177
 178             s->server = 0;
 179             if (cb != NULL)
 180                 cb(s, SSL_CB_HANDSHAKE_START, 1);
 181
 182             if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
 183                 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
 184                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 185                 ret = -1;
 186                 goto end;
 187             }
 188
 189             /* s->version=SSL3_VERSION; */
 190             s->type = SSL_ST_CONNECT;
 191
 192             if (s->init_buf == NULL) {
 193                 if ((buf = BUF_MEM_new()) == NULL) {
 194                     ret = -1;
 195                     goto end;
 196                 }
 197                 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
 198                     ret = -1;
 199                     goto end;
 200                 }
 201                 s->init_buf = buf;
 202                 buf = NULL;
 203             }
 204
 205             if (!ssl3_setup_buffers(s)) {
 206                 ret = -1;
 207                 goto end;
 208             }
 209
 210             /* setup buffing BIO */
 211             if (!ssl_init_wbio_buffer(s, 0)) {
 212                 ret = -1;
 213                 goto end;
 214             }
 215
 216             /* don't push the buffering BIO quite yet */
 217
 218             s->state = SSL3_ST_CW_CLNT_HELLO_A;
 219             s->ctx->stats.sess_connect++;
 220             s->init_num = 0;
 221             /* mark client_random uninitialized */
 222             memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
 223             s->d1->send_cookie = 0;
 224             s->hit = 0;
 225             break;
 226
 227         case SSL3_ST_CW_CLNT_HELLO_A:
 228         case SSL3_ST_CW_CLNT_HELLO_B:
 229
 230             s->shutdown = 0;
 231
 232             /* every DTLS ClientHello resets Finished MAC */
 233             ssl3_init_finished_mac(s);
 234
 235             dtls1_start_timer(s);
 236             ret = dtls1_client_hello(s);
 237             if (ret <= 0)
 238                 goto end;
 239
 240             if (s->d1->send_cookie) {
 241                 s->state = SSL3_ST_CW_FLUSH;
 242                 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
 243             } else
 244                 s->state = SSL3_ST_CR_SRVR_HELLO_A;
 245
 246             s->init_num = 0;
 247
 248             /* turn on buffering for the next lot of output */
 249             if (s->bbio != s->wbio)
 250                 s->wbio = BIO_push(s->bbio, s->wbio);
 251
 252             break;
 253
 254         case SSL3_ST_CR_SRVR_HELLO_A:
 255         case SSL3_ST_CR_SRVR_HELLO_B:
 256             ret = ssl3_get_server_hello(s);
 257             if (ret <= 0)
 258                 goto end;
 259             else {
 260                 if (s->hit)
 261                     s->state = SSL3_ST_CR_FINISHED_A;
 262                 else
 263                     s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 264             }
 265             s->init_num = 0;
 266             break;
 267
 268         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 269         case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 270
 271             ret = dtls1_get_hello_verify(s);
 272             if (ret <= 0)
 273                 goto end;
 274             dtls1_stop_timer(s);
 275             if (s->d1->send_cookie) /* start again, with a cookie */
 276                 s->state = SSL3_ST_CW_CLNT_HELLO_A;
 277             else
 278                 s->state = SSL3_ST_CR_CERT_A;
 279             s->init_num = 0;
 280             break;
 281
 282         case SSL3_ST_CR_CERT_A:
 283         case SSL3_ST_CR_CERT_B:
 284 #ifndef OPENSSL_NO_TLSEXT
 285             ret = ssl3_check_finished(s);
 286             if (ret <= 0)
 287                 goto end;
 288             if (ret == 2) {
 289                 s->hit = 1;
 290                 if (s->tlsext_ticket_expected)
 291                     s->state = SSL3_ST_CR_SESSION_TICKET_A;
 292                 else
 293                     s->state = SSL3_ST_CR_FINISHED_A;
 294                 s->init_num = 0;
 295                 break;
 296             }
 297 #endif
 298             /* Check if it is anon DH */
 299             if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) {
 300                 ret = ssl3_get_server_certificate(s);
 301                 if (ret <= 0)
 302                     goto end;
 303 #ifndef OPENSSL_NO_TLSEXT
 304                 if (s->tlsext_status_expected)
 305                     s->state = SSL3_ST_CR_CERT_STATUS_A;
 306                 else
 307                     s->state = SSL3_ST_CR_KEY_EXCH_A;
 308             } else {
 309                 skip = 1;
 310                 s->state = SSL3_ST_CR_KEY_EXCH_A;
 311             }
 312 #else
 313             } else
 314                 skip = 1;
 315
 316             s->state = SSL3_ST_CR_KEY_EXCH_A;
 317 #endif
 318             s->init_num = 0;
 319             break;
 320
 321         case SSL3_ST_CR_KEY_EXCH_A:
 322         case SSL3_ST_CR_KEY_EXCH_B:
 323             ret = ssl3_get_key_exchange(s);
 324             if (ret <= 0)
 325                 goto end;
 326             s->state = SSL3_ST_CR_CERT_REQ_A;
 327             s->init_num = 0;
 328
 329             /*
 330              * at this point we check that we have the required stuff from
 331              * the server
 332              */
 333             if (!ssl3_check_cert_and_algorithm(s)) {
 334                 ret = -1;
 335                 goto end;
 336             }
 337             break;
 338
 339         case SSL3_ST_CR_CERT_REQ_A:
 340         case SSL3_ST_CR_CERT_REQ_B:
 341             ret = ssl3_get_certificate_request(s);
 342             if (ret <= 0)
 343                 goto end;
 344             s->state = SSL3_ST_CR_SRVR_DONE_A;
 345             s->init_num = 0;
 346             break;
 347
 348         case SSL3_ST_CR_SRVR_DONE_A:
 349         case SSL3_ST_CR_SRVR_DONE_B:
 350             ret = ssl3_get_server_done(s);
 351             if (ret <= 0)
 352                 goto end;
 353             dtls1_stop_timer(s);
 354             if (s->s3->tmp.cert_req)
 355                 s->state = SSL3_ST_CW_CERT_A;
 356             else
 357                 s->state = SSL3_ST_CW_KEY_EXCH_A;
 358             s->init_num = 0;
 359
 360             break;
 361
 362         case SSL3_ST_CW_CERT_A:
 363         case SSL3_ST_CW_CERT_B:
 364         case SSL3_ST_CW_CERT_C:
 365         case SSL3_ST_CW_CERT_D:
 366             dtls1_start_timer(s);
 367             ret = dtls1_send_client_certificate(s);
 368             if (ret <= 0)
 369                 goto end;
 370             s->state = SSL3_ST_CW_KEY_EXCH_A;
 371             s->init_num = 0;
 372             break;
 373
 374         case SSL3_ST_CW_KEY_EXCH_A:
 375         case SSL3_ST_CW_KEY_EXCH_B:
 376             dtls1_start_timer(s);
 377             ret = dtls1_send_client_key_exchange(s);
 378             if (ret <= 0)
 379                 goto end;
 380             /*
 381              * EAY EAY EAY need to check for DH fix cert sent back
 382              */
 383             /*
 384              * For TLS, cert_req is set to 2, so a cert chain of nothing is
 385              * sent, but no verify packet is sent
 386              */
 387             if (s->s3->tmp.cert_req == 1) {
 388                 s->state = SSL3_ST_CW_CERT_VRFY_A;
 389             } else {
 390                 s->state = SSL3_ST_CW_CHANGE_A;
 391                 s->s3->change_cipher_spec = 0;
 392             }
 393
 394             s->init_num = 0;
 395             break;
 396
 397         case SSL3_ST_CW_CERT_VRFY_A:
 398         case SSL3_ST_CW_CERT_VRFY_B:
 399             dtls1_start_timer(s);
 400             ret = dtls1_send_client_verify(s);
 401             if (ret <= 0)
 402                 goto end;
 403             s->state = SSL3_ST_CW_CHANGE_A;
 404             s->init_num = 0;
 405             s->s3->change_cipher_spec = 0;
 406             break;
 407
 408         case SSL3_ST_CW_CHANGE_A:
 409         case SSL3_ST_CW_CHANGE_B:
 410             if (!s->hit)
 411                 dtls1_start_timer(s);
 412             ret = dtls1_send_change_cipher_spec(s,
 413                                                 SSL3_ST_CW_CHANGE_A,
 414                                                 SSL3_ST_CW_CHANGE_B);
 415             if (ret <= 0)
 416                 goto end;
 417             s->state = SSL3_ST_CW_FINISHED_A;
 418             s->init_num = 0;
 419
 420             s->session->cipher = s->s3->tmp.new_cipher;
 421 #ifdef OPENSSL_NO_COMP
 422             s->session->compress_meth = 0;
 423 #else
 424             if (s->s3->tmp.new_compression == NULL)
 425                 s->session->compress_meth = 0;
 426             else
 427                 s->session->compress_meth = s->s3->tmp.new_compression->id;
 428 #endif
 429             if (!s->method->ssl3_enc->setup_key_block(s)) {
 430                 ret = -1;
 431                 goto end;
 432             }
 433
 434             if (!s->method->ssl3_enc->change_cipher_state(s,
 435                                                           SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 436             {
 437                 ret = -1;
 438                 goto end;
 439             }
 440
 441             dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 442             break;
 443
 444         case SSL3_ST_CW_FINISHED_A:
 445         case SSL3_ST_CW_FINISHED_B:
 446             if (!s->hit)
 447                 dtls1_start_timer(s);
 448             ret = dtls1_send_finished(s,
 449                                       SSL3_ST_CW_FINISHED_A,
 450                                       SSL3_ST_CW_FINISHED_B,
 451                                       s->method->
 452                                       ssl3_enc->client_finished_label,
 453                                       s->method->
 454                                       ssl3_enc->client_finished_label_len);
 455             if (ret <= 0)
 456                 goto end;
 457             s->state = SSL3_ST_CW_FLUSH;
 458
 459             /* clear flags */
 460             s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
 461             if (s->hit) {
 462                 s->s3->tmp.next_state = SSL_ST_OK;
 463                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
 464                     s->state = SSL_ST_OK;
 465                     s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
 466                     s->s3->delay_buf_pop_ret = 0;
 467                 }
 468             } else {
 469 #ifndef OPENSSL_NO_TLSEXT
 470                 /*
 471                  * Allow NewSessionTicket if ticket expected
 472                  */
 473                 if (s->tlsext_ticket_expected)
 474                     s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
 475                 else
 476 #endif
 477
 478                     s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
 479             }
 480             s->init_num = 0;
 481
 482             break;
 483
 484 #ifndef OPENSSL_NO_TLSEXT
 485         case SSL3_ST_CR_SESSION_TICKET_A:
 486         case SSL3_ST_CR_SESSION_TICKET_B:
 487             ret = ssl3_get_new_session_ticket(s);
 488             if (ret <= 0)
 489                 goto end;
 490             s->state = SSL3_ST_CR_FINISHED_A;
 491             s->init_num = 0;
 492             break;
 493
 494         case SSL3_ST_CR_CERT_STATUS_A:
 495         case SSL3_ST_CR_CERT_STATUS_B:
 496             ret = ssl3_get_cert_status(s);
 497             if (ret <= 0)
 498                 goto end;
 499             s->state = SSL3_ST_CR_KEY_EXCH_A;
 500             s->init_num = 0;
 501             break;
 502 #endif
 503
 504         case SSL3_ST_CR_FINISHED_A:
 505         case SSL3_ST_CR_FINISHED_B:
 506             s->d1->change_cipher_spec_ok = 1;
 507             ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
 508                                     SSL3_ST_CR_FINISHED_B);
 509             if (ret <= 0)
 510                 goto end;
 511             dtls1_stop_timer(s);
 512
 513             if (s->hit)
 514                 s->state = SSL3_ST_CW_CHANGE_A;
 515             else
 516                 s->state = SSL_ST_OK;
 517             s->init_num = 0;
 518             break;
 519
 520         case SSL3_ST_CW_FLUSH:
 521             s->rwstate = SSL_WRITING;
 522             if (BIO_flush(s->wbio) <= 0) {
 523                 ret = -1;
 524                 goto end;
 525             }
 526             s->rwstate = SSL_NOTHING;
 527             s->state = s->s3->tmp.next_state;
 528             break;
 529
 530         case SSL_ST_OK:
 531             /* clean a few things up */
 532             ssl3_cleanup_key_block(s);
 533
 534 #if 0
 535             if (s->init_buf != NULL) {
 536                 BUF_MEM_free(s->init_buf);
 537                 s->init_buf = NULL;
 538             }
 539 #endif
 540
 541             /*
 542              * If we are not 'joining' the last two packets, remove the
 543              * buffering now
 544              */
 545             if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 546                 ssl_free_wbio_buffer(s);
 547             /* else do it later in ssl3_write */
 548
 549             s->init_num = 0;
 550             s->new_session = 0;
 551
 552             ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
 553             if (s->hit)
 554                 s->ctx->stats.sess_hit++;
 555
 556             ret = 1;
 557             /* s->server=0; */
 558             s->handshake_func = dtls1_connect;
 559             s->ctx->stats.sess_connect_good++;
 560
 561             if (cb != NULL)
 562                 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
 563
 564             /* done with handshaking */
 565             s->d1->handshake_read_seq = 0;
 566             s->d1->next_handshake_write_seq = 0;
 567             dtls1_clear_received_buffer(s);
 568             goto end;
 569             /* break; */
 570
 571         default:
 572             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 573             ret = -1;
 574             goto end;
 575             /* break; */
 576         }
 577
 578         /* did we do anything */
 579         if (!s->s3->tmp.reuse_message && !skip) {
 580             if (s->debug) {
 581                 if ((ret = BIO_flush(s->wbio)) <= 0)
 582                     goto end;
 583             }
 584
 585             if ((cb != NULL) && (s->state != state)) {
 586                 new_state = s->state;
 587                 s->state = state;
 588                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 589                 s->state = new_state;
 590             }
 591         }
 592         skip = 0;
 593     }
 594  end:
 595     s->in_handshake--;
 596     if (buf != NULL)
 597         BUF_MEM_free(buf);
 598     if (cb != NULL)
 599         cb(s, SSL_CB_CONNECT_EXIT, ret);
 600     return (ret);
 601 }
 602
 603 int dtls1_client_hello(SSL *s)
 604 {
 605     unsigned char *buf;
 606     unsigned char *p, *d;
 607     unsigned int i, j;
 608     unsigned long Time, l;
 609     SSL_COMP *comp;
 610
 611     buf = (unsigned char *)s->init_buf->data;
 612     if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
 613         SSL_SESSION *sess = s->session;
 614         if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
 615 #ifdef OPENSSL_NO_TLSEXT
 616             !sess->session_id_length ||
 617 #else
 618             (!sess->session_id_length && !sess->tlsext_tick) ||
 619 #endif
 620             (s->session->not_resumable)) {
 621             if (!ssl_get_new_session(s, 0))
 622                 goto err;
 623         }
 624         /* else use the pre-loaded session */
 625
 626         p = s->s3->client_random;
 627         /*
 628          * if client_random is initialized, reuse it, we are required to use
 629          * same upon reply to HelloVerify
 630          */
 631         for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
 632         if (i == sizeof(s->s3->client_random)) {
 633             Time = (unsigned long)time(NULL); /* Time */
 634             l2n(Time, p);
 635             RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
 636         }
 637
 638         /* Do the message type and length last */
 639         d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 640
 641         *(p++) = s->version >> 8;
 642         *(p++) = s->version & 0xff;
 643         s->client_version = s->version;
 644
 645         /* Random stuff */
 646         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 647         p += SSL3_RANDOM_SIZE;
 648
 649         /* Session ID */
 650         if (s->new_session)
 651             i = 0;
 652         else
 653             i = s->session->session_id_length;
 654         *(p++) = i;
 655         if (i != 0) {
 656             if (i > sizeof s->session->session_id) {
 657                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 658                 goto err;
 659             }
 660             memcpy(p, s->session->session_id, i);
 661             p += i;
 662         }
 663
 664         /* cookie stuff */
 665         if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
 666             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 667             goto err;
 668         }
 669         *(p++) = s->d1->cookie_len;
 670         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 671         p += s->d1->cookie_len;
 672
 673         /* Ciphers supported */
 674         i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
 675         if (i == 0) {
 676             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
 677             goto err;
 678         }
 679         s2n(i, p);
 680         p += i;
 681
 682         /* COMPRESSION */
 683         if (s->ctx->comp_methods == NULL)
 684             j = 0;
 685         else
 686             j = sk_SSL_COMP_num(s->ctx->comp_methods);
 687         *(p++) = 1 + j;
 688         for (i = 0; i < j; i++) {
 689             comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
 690             *(p++) = comp->id;
 691         }
 692         *(p++) = 0;             /* Add the NULL method */
 693
 694 #ifndef OPENSSL_NO_TLSEXT
 695         if ((p =
 696              ssl_add_clienthello_tlsext(s, p,
 697                                         buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
 698             NULL) {
 699             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 700             goto err;
 701         }
 702 #endif
 703
 704         l = (p - d);
 705         d = buf;
 706
 707         d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 708
 709         s->state = SSL3_ST_CW_CLNT_HELLO_B;
 710         /* number of bytes to write */
 711         s->init_num = p - buf;
 712         s->init_off = 0;
 713
 714         /* buffer the message to handle re-xmits */
 715         dtls1_buffer_message(s, 0);
 716     }
 717
 718     /* SSL3_ST_CW_CLNT_HELLO_B */
 719     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 720  err:
 721     return (-1);
 722 }
 723
 724 static int dtls1_get_hello_verify(SSL *s)
 725 {
 726     int n, al, ok = 0;
 727     unsigned char *data;
 728     unsigned int cookie_len;
 729
 730     n = s->method->ssl_get_message(s,
 731                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 732                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 733                                    -1, s->max_cert_list, &ok);
 734
 735     if (!ok)
 736         return ((int)n);
 737
 738     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 739         s->d1->send_cookie = 0;
 740         s->s3->tmp.reuse_message = 1;
 741         return (1);
 742     }
 743
 744     data = (unsigned char *)s->init_msg;
 745
 746     if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
 747         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 748         s->version = (s->version & 0xff00) | data[1];
 749         al = SSL_AD_PROTOCOL_VERSION;
 750         goto f_err;
 751     }
 752     data += 2;
 753
 754     cookie_len = *(data++);
 755     if (cookie_len > sizeof(s->d1->cookie)) {
 756         al = SSL_AD_ILLEGAL_PARAMETER;
 757         goto f_err;
 758     }
 759
 760     memcpy(s->d1->cookie, data, cookie_len);
 761     s->d1->cookie_len = cookie_len;
 762
 763     s->d1->send_cookie = 1;
 764     return 1;
 765
 766  f_err:
 767     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 768     return -1;
 769 }
 770
 771 int dtls1_send_client_key_exchange(SSL *s)
 772 {
 773     unsigned char *p, *d;
 774     int n;
 775     unsigned long l;
 776 #ifndef OPENSSL_NO_RSA
 777     unsigned char *q;
 778     EVP_PKEY *pkey = NULL;
 779 #endif
 780 #ifndef OPENSSL_NO_KRB5
 781     KSSL_ERR kssl_err;
 782 #endif                          /* OPENSSL_NO_KRB5 */
 783
 784     if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
 785         d = (unsigned char *)s->init_buf->data;
 786         p = &(d[DTLS1_HM_HEADER_LENGTH]);
 787
 788         l = s->s3->tmp.new_cipher->algorithms;
 789
 790         /* Fool emacs indentation */
 791         if (0) {
 792         }
 793 #ifndef OPENSSL_NO_RSA
 794         else if (l & SSL_kRSA) {
 795             RSA *rsa;
 796             unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 797
 798             if (s->session->sess_cert == NULL) {
 799                 /*
 800                  * We should always have a server certificate with SSL_kRSA.
 801                  */
 802                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 803                        ERR_R_INTERNAL_ERROR);
 804                 goto err;
 805             }
 806
 807             if (s->session->sess_cert->peer_rsa_tmp != NULL)
 808                 rsa = s->session->sess_cert->peer_rsa_tmp;
 809             else {
 810                 pkey =
 811                     X509_get_pubkey(s->session->
 812                                     sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
 813                                     x509);
 814                 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
 815                     || (pkey->pkey.rsa == NULL)) {
 816                     SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 817                            ERR_R_INTERNAL_ERROR);
 818                     goto err;
 819                 }
 820                 rsa = pkey->pkey.rsa;
 821                 EVP_PKEY_free(pkey);
 822             }
 823
 824             tmp_buf[0] = s->client_version >> 8;
 825             tmp_buf[1] = s->client_version & 0xff;
 826             if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
 827                 goto err;
 828
 829             s->session->master_key_length = sizeof tmp_buf;
 830
 831             q = p;
 832             /* Fix buf for TLS and [incidentally] DTLS */
 833             if (s->version > SSL3_VERSION)
 834                 p += 2;
 835             n = RSA_public_encrypt(sizeof tmp_buf,
 836                                    tmp_buf, p, rsa, RSA_PKCS1_PADDING);
 837 # ifdef PKCS1_CHECK
 838             if (s->options & SSL_OP_PKCS1_CHECK_1)
 839                 p[1]++;
 840             if (s->options & SSL_OP_PKCS1_CHECK_2)
 841                 tmp_buf[0] = 0x70;
 842 # endif
 843             if (n <= 0) {
 844                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 845                        SSL_R_BAD_RSA_ENCRYPT);
 846                 goto err;
 847             }
 848
 849             /* Fix buf for TLS and [incidentally] DTLS */
 850             if (s->version > SSL3_VERSION) {
 851                 s2n(n, q);
 852                 n += 2;
 853             }
 854
 855             s->session->master_key_length =
 856                 s->method->ssl3_enc->generate_master_secret(s,
 857                                                             s->
 858                                                             session->master_key,
 859                                                             tmp_buf,
 860                                                             sizeof tmp_buf);
 861             OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 862         }
 863 #endif
 864 #ifndef OPENSSL_NO_KRB5
 865         else if (l & SSL_kKRB5) {
 866             krb5_error_code krb5rc;
 867             KSSL_CTX *kssl_ctx = s->kssl_ctx;
 868             /*  krb5_data   krb5_ap_req;  */
 869             krb5_data *enc_ticket;
 870             krb5_data authenticator, *authp = NULL;
 871             EVP_CIPHER_CTX ciph_ctx;
 872             EVP_CIPHER *enc = NULL;
 873             unsigned char iv[EVP_MAX_IV_LENGTH];
 874             unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 875             unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
 876             int padl, outl = sizeof(epms);
 877
 878             EVP_CIPHER_CTX_init(&ciph_ctx);
 879
 880 # ifdef KSSL_DEBUG
 881             printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 882                    l, SSL_kKRB5);
 883 # endif                         /* KSSL_DEBUG */
 884
 885             authp = NULL;
 886 # ifdef KRB5SENDAUTH
 887             if (KRB5SENDAUTH)
 888                 authp = &authenticator;
 889 # endif                         /* KRB5SENDAUTH */
 890
 891             krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
 892             enc = kssl_map_enc(kssl_ctx->enctype);
 893             if (enc == NULL)
 894                 goto err;
 895 # ifdef KSSL_DEBUG
 896             {
 897                 printf("kssl_cget_tkt rtn %d\n", krb5rc);
 898                 if (krb5rc && kssl_err.text)
 899                     printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 900             }
 901 # endif                         /* KSSL_DEBUG */
 902
 903             if (krb5rc) {
 904                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
 905                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
 906                 goto err;
 907             }
 908
 909             /*-
 910              *   20010406 VRS - Earlier versions used KRB5 AP_REQ
 911             **  in place of RFC 2712 KerberosWrapper, as in:
 912             **
 913             **  Send ticket (copy to *p, set n = length)
 914             **  n = krb5_ap_req.length;
 915             **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 916             **  if (krb5_ap_req.data)
 917             **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 918             **
 919             **  Now using real RFC 2712 KerberosWrapper
 920             **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 921             **  Note: 2712 "opaque" types are here replaced
 922             **  with a 2-byte length followed by the value.
 923             **  Example:
 924             **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 925             **  Where "xx xx" = length bytes.  Shown here with
 926             **  optional authenticator omitted.
 927             */
 928
 929             /*  KerberosWrapper.Ticket              */
 930             s2n(enc_ticket->length, p);
 931             memcpy(p, enc_ticket->data, enc_ticket->length);
 932             p += enc_ticket->length;
 933             n = enc_ticket->length + 2;
 934
 935             /*  KerberosWrapper.Authenticator       */
 936             if (authp && authp->length) {
 937                 s2n(authp->length, p);
 938                 memcpy(p, authp->data, authp->length);
 939                 p += authp->length;
 940                 n += authp->length + 2;
 941
 942                 free(authp->data);
 943                 authp->data = NULL;
 944                 authp->length = 0;
 945             } else {
 946                 s2n(0, p);      /* null authenticator length */
 947                 n += 2;
 948             }
 949
 950             if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
 951                 goto err;
 952
 953             /*-
 954              *  20010420 VRS.  Tried it this way; failed.
 955              *      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 956              *      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 957              *                              kssl_ctx->length);
 958              *      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 959              */
 960
 961             memset(iv, 0, sizeof iv); /* per RFC 1510 */
 962             EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
 963             EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
 964                               sizeof tmp_buf);
 965             EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
 966             outl += padl;
 967             if (outl > sizeof epms) {
 968                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 969                        ERR_R_INTERNAL_ERROR);
 970                 goto err;
 971             }
 972             EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 973
 974             /*  KerberosWrapper.EncryptedPreMasterSecret    */
 975             s2n(outl, p);
 976             memcpy(p, epms, outl);
 977             p += outl;
 978             n += outl + 2;
 979
 980             s->session->master_key_length =
 981                 s->method->ssl3_enc->generate_master_secret(s,
 982                                                             s->
 983                                                             session->master_key,
 984                                                             tmp_buf,
 985                                                             sizeof tmp_buf);
 986
 987             OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 988             OPENSSL_cleanse(epms, outl);
 989         }
 990 #endif
 991 #ifndef OPENSSL_NO_DH
 992         else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
 993             DH *dh_srvr, *dh_clnt;
 994
 995             if (s->session->sess_cert == NULL) {
 996                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
 997                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 998                        SSL_R_UNEXPECTED_MESSAGE);
 999                 goto err;
1000             }
1001
1002             if (s->session->sess_cert->peer_dh_tmp != NULL)
1003                 dh_srvr = s->session->sess_cert->peer_dh_tmp;
1004             else {
1005                 /* we get them from the cert */
1006                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1007                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1008                        SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1009                 goto err;
1010             }
1011
1012             /* generate a new random key */
1013             if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1014                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1015                 goto err;
1016             }
1017             if (!DH_generate_key(dh_clnt)) {
1018                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1019                 goto err;
1020             }
1021
1022             /*
1023              * use the 'p' output buffer for the DH key, but make sure to
1024              * clear it out afterwards
1025              */
1026
1027             n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
1028
1029             if (n <= 0) {
1030                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1031                 goto err;
1032             }
1033
1034             /* generate master key from the result */
1035             s->session->master_key_length =
1036                 s->method->ssl3_enc->generate_master_secret(s,
1037                                                             s->
1038                                                             session->master_key,
1039                                                             p, n);
1040             /* clean up */
1041             memset(p, 0, n);
1042
1043             /* send off the data */
1044             n = BN_num_bytes(dh_clnt->pub_key);
1045             s2n(n, p);
1046             BN_bn2bin(dh_clnt->pub_key, p);
1047             n += 2;
1048
1049             DH_free(dh_clnt);
1050
1051             /* perhaps clean things up a bit EAY EAY EAY EAY */
1052         }
1053 #endif
1054         else {
1055             ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1056             SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1057                    ERR_R_INTERNAL_ERROR);
1058             goto err;
1059         }
1060
1061         d = dtls1_set_message_header(s, d,
1062                                      SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1063         /*-
1064          *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1065          l2n3(n,d);
1066          l2n(s->d1->handshake_write_seq,d);
1067          s->d1->handshake_write_seq++;
1068         */
1069
1070         s->state = SSL3_ST_CW_KEY_EXCH_B;
1071         /* number of bytes to write */
1072         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1073         s->init_off = 0;
1074
1075         /* buffer the message to handle re-xmits */
1076         dtls1_buffer_message(s, 0);
1077     }
1078
1079     /* SSL3_ST_CW_KEY_EXCH_B */
1080     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1081  err:
1082     return (-1);
1083 }
1084
1085 int dtls1_send_client_verify(SSL *s)
1086 {
1087     unsigned char *p, *d;
1088     unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1089     EVP_PKEY *pkey;
1090 #ifndef OPENSSL_NO_RSA
1091     unsigned u = 0;
1092 #endif
1093     unsigned long n;
1094 #ifndef OPENSSL_NO_DSA
1095     int j;
1096 #endif
1097
1098     if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
1099         d = (unsigned char *)s->init_buf->data;
1100         p = &(d[DTLS1_HM_HEADER_LENGTH]);
1101         pkey = s->cert->key->privatekey;
1102
1103         s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
1104                                              &(data[MD5_DIGEST_LENGTH]));
1105
1106 #ifndef OPENSSL_NO_RSA
1107         if (pkey->type == EVP_PKEY_RSA) {
1108             s->method->ssl3_enc->cert_verify_mac(s,
1109                                                  &(s->s3->finish_dgst1),
1110                                                  &(data[0]));
1111             if (RSA_sign
1112                 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
1113                  &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1114                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
1115                 goto err;
1116             }
1117             s2n(u, p);
1118             n = u + 2;
1119         } else
1120 #endif
1121 #ifndef OPENSSL_NO_DSA
1122         if (pkey->type == EVP_PKEY_DSA) {
1123             if (!DSA_sign(pkey->save_type,
1124                           &(data[MD5_DIGEST_LENGTH]),
1125                           SHA_DIGEST_LENGTH, &(p[2]),
1126                           (unsigned int *)&j, pkey->pkey.dsa)) {
1127                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
1128                 goto err;
1129             }
1130             s2n(j, p);
1131             n = j + 2;
1132         } else
1133 #endif
1134         {
1135             SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
1136             goto err;
1137         }
1138
1139         d = dtls1_set_message_header(s, d,
1140                                      SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
1141
1142         s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
1143         s->init_off = 0;
1144
1145         /* buffer the message to handle re-xmits */
1146         dtls1_buffer_message(s, 0);
1147
1148         s->state = SSL3_ST_CW_CERT_VRFY_B;
1149     }
1150
1151     /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1152     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1153  err:
1154     return (-1);
1155 }
1156
1157 int dtls1_send_client_certificate(SSL *s)
1158 {
1159     X509 *x509 = NULL;
1160     EVP_PKEY *pkey = NULL;
1161     int i;
1162     unsigned long l;
1163
1164     if (s->state == SSL3_ST_CW_CERT_A) {
1165         if ((s->cert == NULL) ||
1166             (s->cert->key->x509 == NULL) ||
1167             (s->cert->key->privatekey == NULL))
1168             s->state = SSL3_ST_CW_CERT_B;
1169         else
1170             s->state = SSL3_ST_CW_CERT_C;
1171     }
1172
1173     /* We need to get a client cert */
1174     if (s->state == SSL3_ST_CW_CERT_B) {
1175         /*
1176          * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
1177          * return(-1); We then get retied later
1178          */
1179         i = 0;
1180         i = ssl_do_client_cert_cb(s, &x509, &pkey);
1181         if (i < 0) {
1182             s->rwstate = SSL_X509_LOOKUP;
1183             return (-1);
1184         }
1185         s->rwstate = SSL_NOTHING;
1186         if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
1187             s->state = SSL3_ST_CW_CERT_B;
1188             if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
1189                 i = 0;
1190         } else if (i == 1) {
1191             i = 0;
1192             SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
1193                    SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1194         }
1195
1196         if (x509 != NULL)
1197             X509_free(x509);
1198         if (pkey != NULL)
1199             EVP_PKEY_free(pkey);
1200         if (i == 0) {
1201             if (s->version == SSL3_VERSION) {
1202                 s->s3->tmp.cert_req = 0;
1203                 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
1204                 return (1);
1205             } else {
1206                 s->s3->tmp.cert_req = 2;
1207             }
1208         }
1209
1210         /* Ok, we have a cert */
1211         s->state = SSL3_ST_CW_CERT_C;
1212     }
1213
1214     if (s->state == SSL3_ST_CW_CERT_C) {
1215         s->state = SSL3_ST_CW_CERT_D;
1216         l = dtls1_output_cert_chain(s,
1217                                     (s->s3->tmp.cert_req ==
1218                                      2) ? NULL : s->cert->key->x509);
1219         s->init_num = (int)l;
1220         s->init_off = 0;
1221
1222         /* set header called by dtls1_output_cert_chain() */
1223
1224         /* buffer the message to handle re-xmits */
1225         dtls1_buffer_message(s, 0);
1226     }
1227     /* SSL3_ST_CW_CERT_D */
1228     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1229 }