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             goto end;
 568             /* break; */
 569
 570         default:
 571             SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
 572             ret = -1;
 573             goto end;
 574             /* break; */
 575         }
 576
 577         /* did we do anything */
 578         if (!s->s3->tmp.reuse_message && !skip) {
 579             if (s->debug) {
 580                 if ((ret = BIO_flush(s->wbio)) <= 0)
 581                     goto end;
 582             }
 583
 584             if ((cb != NULL) && (s->state != state)) {
 585                 new_state = s->state;
 586                 s->state = state;
 587                 cb(s, SSL_CB_CONNECT_LOOP, 1);
 588                 s->state = new_state;
 589             }
 590         }
 591         skip = 0;
 592     }
 593  end:
 594     s->in_handshake--;
 595     if (buf != NULL)
 596         BUF_MEM_free(buf);
 597     if (cb != NULL)
 598         cb(s, SSL_CB_CONNECT_EXIT, ret);
 599     return (ret);
 600 }
 601
 602 int dtls1_client_hello(SSL *s)
 603 {
 604     unsigned char *buf;
 605     unsigned char *p, *d;
 606     unsigned int i, j;
 607     unsigned long Time, l;
 608     SSL_COMP *comp;
 609
 610     buf = (unsigned char *)s->init_buf->data;
 611     if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
 612         SSL_SESSION *sess = s->session;
 613         if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
 614 #ifdef OPENSSL_NO_TLSEXT
 615             !sess->session_id_length ||
 616 #else
 617             (!sess->session_id_length && !sess->tlsext_tick) ||
 618 #endif
 619             (s->session->not_resumable)) {
 620             if (!ssl_get_new_session(s, 0))
 621                 goto err;
 622         }
 623         /* else use the pre-loaded session */
 624
 625         p = s->s3->client_random;
 626         /*
 627          * if client_random is initialized, reuse it, we are required to use
 628          * same upon reply to HelloVerify
 629          */
 630         for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
 631         if (i == sizeof(s->s3->client_random)) {
 632             Time = (unsigned long)time(NULL); /* Time */
 633             l2n(Time, p);
 634             RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
 635         }
 636
 637         /* Do the message type and length last */
 638         d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 639
 640         *(p++) = s->version >> 8;
 641         *(p++) = s->version & 0xff;
 642         s->client_version = s->version;
 643
 644         /* Random stuff */
 645         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
 646         p += SSL3_RANDOM_SIZE;
 647
 648         /* Session ID */
 649         if (s->new_session)
 650             i = 0;
 651         else
 652             i = s->session->session_id_length;
 653         *(p++) = i;
 654         if (i != 0) {
 655             if (i > sizeof s->session->session_id) {
 656                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 657                 goto err;
 658             }
 659             memcpy(p, s->session->session_id, i);
 660             p += i;
 661         }
 662
 663         /* cookie stuff */
 664         if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
 665             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 666             goto err;
 667         }
 668         *(p++) = s->d1->cookie_len;
 669         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 670         p += s->d1->cookie_len;
 671
 672         /* Ciphers supported */
 673         i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
 674         if (i == 0) {
 675             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
 676             goto err;
 677         }
 678         s2n(i, p);
 679         p += i;
 680
 681         /* COMPRESSION */
 682         if (s->ctx->comp_methods == NULL)
 683             j = 0;
 684         else
 685             j = sk_SSL_COMP_num(s->ctx->comp_methods);
 686         *(p++) = 1 + j;
 687         for (i = 0; i < j; i++) {
 688             comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
 689             *(p++) = comp->id;
 690         }
 691         *(p++) = 0;             /* Add the NULL method */
 692
 693 #ifndef OPENSSL_NO_TLSEXT
 694         if ((p =
 695              ssl_add_clienthello_tlsext(s, p,
 696                                         buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
 697             NULL) {
 698             SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 699             goto err;
 700         }
 701 #endif
 702
 703         l = (p - d);
 704         d = buf;
 705
 706         d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 707
 708         s->state = SSL3_ST_CW_CLNT_HELLO_B;
 709         /* number of bytes to write */
 710         s->init_num = p - buf;
 711         s->init_off = 0;
 712
 713         /* buffer the message to handle re-xmits */
 714         dtls1_buffer_message(s, 0);
 715     }
 716
 717     /* SSL3_ST_CW_CLNT_HELLO_B */
 718     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
 719  err:
 720     return (-1);
 721 }
 722
 723 static int dtls1_get_hello_verify(SSL *s)
 724 {
 725     int n, al, ok = 0;
 726     unsigned char *data;
 727     unsigned int cookie_len;
 728
 729     n = s->method->ssl_get_message(s,
 730                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 731                                    DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 732                                    -1, s->max_cert_list, &ok);
 733
 734     if (!ok)
 735         return ((int)n);
 736
 737     if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
 738         s->d1->send_cookie = 0;
 739         s->s3->tmp.reuse_message = 1;
 740         return (1);
 741     }
 742
 743     data = (unsigned char *)s->init_msg;
 744
 745     if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
 746         SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
 747         s->version = (s->version & 0xff00) | data[1];
 748         al = SSL_AD_PROTOCOL_VERSION;
 749         goto f_err;
 750     }
 751     data += 2;
 752
 753     cookie_len = *(data++);
 754     if (cookie_len > sizeof(s->d1->cookie)) {
 755         al = SSL_AD_ILLEGAL_PARAMETER;
 756         goto f_err;
 757     }
 758
 759     memcpy(s->d1->cookie, data, cookie_len);
 760     s->d1->cookie_len = cookie_len;
 761
 762     s->d1->send_cookie = 1;
 763     return 1;
 764
 765  f_err:
 766     ssl3_send_alert(s, SSL3_AL_FATAL, al);
 767     return -1;
 768 }
 769
 770 int dtls1_send_client_key_exchange(SSL *s)
 771 {
 772     unsigned char *p, *d;
 773     int n;
 774     unsigned long l;
 775 #ifndef OPENSSL_NO_RSA
 776     unsigned char *q;
 777     EVP_PKEY *pkey = NULL;
 778 #endif
 779 #ifndef OPENSSL_NO_KRB5
 780     KSSL_ERR kssl_err;
 781 #endif                          /* OPENSSL_NO_KRB5 */
 782
 783     if (s->state == SSL3_ST_CW_KEY_EXCH_A) {
 784         d = (unsigned char *)s->init_buf->data;
 785         p = &(d[DTLS1_HM_HEADER_LENGTH]);
 786
 787         l = s->s3->tmp.new_cipher->algorithms;
 788
 789         /* Fool emacs indentation */
 790         if (0) {
 791         }
 792 #ifndef OPENSSL_NO_RSA
 793         else if (l & SSL_kRSA) {
 794             RSA *rsa;
 795             unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 796
 797             if (s->session->sess_cert == NULL) {
 798                 /*
 799                  * We should always have a server certificate with SSL_kRSA.
 800                  */
 801                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 802                        ERR_R_INTERNAL_ERROR);
 803                 goto err;
 804             }
 805
 806             if (s->session->sess_cert->peer_rsa_tmp != NULL)
 807                 rsa = s->session->sess_cert->peer_rsa_tmp;
 808             else {
 809                 pkey =
 810                     X509_get_pubkey(s->session->
 811                                     sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
 812                                     x509);
 813                 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
 814                     || (pkey->pkey.rsa == NULL)) {
 815                     SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 816                            ERR_R_INTERNAL_ERROR);
 817                     goto err;
 818                 }
 819                 rsa = pkey->pkey.rsa;
 820                 EVP_PKEY_free(pkey);
 821             }
 822
 823             tmp_buf[0] = s->client_version >> 8;
 824             tmp_buf[1] = s->client_version & 0xff;
 825             if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
 826                 goto err;
 827
 828             s->session->master_key_length = sizeof tmp_buf;
 829
 830             q = p;
 831             /* Fix buf for TLS and [incidentally] DTLS */
 832             if (s->version > SSL3_VERSION)
 833                 p += 2;
 834             n = RSA_public_encrypt(sizeof tmp_buf,
 835                                    tmp_buf, p, rsa, RSA_PKCS1_PADDING);
 836 # ifdef PKCS1_CHECK
 837             if (s->options & SSL_OP_PKCS1_CHECK_1)
 838                 p[1]++;
 839             if (s->options & SSL_OP_PKCS1_CHECK_2)
 840                 tmp_buf[0] = 0x70;
 841 # endif
 842             if (n <= 0) {
 843                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 844                        SSL_R_BAD_RSA_ENCRYPT);
 845                 goto err;
 846             }
 847
 848             /* Fix buf for TLS and [incidentally] DTLS */
 849             if (s->version > SSL3_VERSION) {
 850                 s2n(n, q);
 851                 n += 2;
 852             }
 853
 854             s->session->master_key_length =
 855                 s->method->ssl3_enc->generate_master_secret(s,
 856                                                             s->
 857                                                             session->master_key,
 858                                                             tmp_buf,
 859                                                             sizeof tmp_buf);
 860             OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 861         }
 862 #endif
 863 #ifndef OPENSSL_NO_KRB5
 864         else if (l & SSL_kKRB5) {
 865             krb5_error_code krb5rc;
 866             KSSL_CTX *kssl_ctx = s->kssl_ctx;
 867             /*  krb5_data   krb5_ap_req;  */
 868             krb5_data *enc_ticket;
 869             krb5_data authenticator, *authp = NULL;
 870             EVP_CIPHER_CTX ciph_ctx;
 871             EVP_CIPHER *enc = NULL;
 872             unsigned char iv[EVP_MAX_IV_LENGTH];
 873             unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 874             unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
 875             int padl, outl = sizeof(epms);
 876
 877             EVP_CIPHER_CTX_init(&ciph_ctx);
 878
 879 # ifdef KSSL_DEBUG
 880             printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 881                    l, SSL_kKRB5);
 882 # endif                         /* KSSL_DEBUG */
 883
 884             authp = NULL;
 885 # ifdef KRB5SENDAUTH
 886             if (KRB5SENDAUTH)
 887                 authp = &authenticator;
 888 # endif                         /* KRB5SENDAUTH */
 889
 890             krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
 891             enc = kssl_map_enc(kssl_ctx->enctype);
 892             if (enc == NULL)
 893                 goto err;
 894 # ifdef KSSL_DEBUG
 895             {
 896                 printf("kssl_cget_tkt rtn %d\n", krb5rc);
 897                 if (krb5rc && kssl_err.text)
 898                     printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 899             }
 900 # endif                         /* KSSL_DEBUG */
 901
 902             if (krb5rc) {
 903                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
 904                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason);
 905                 goto err;
 906             }
 907
 908             /*-
 909              *   20010406 VRS - Earlier versions used KRB5 AP_REQ
 910             **  in place of RFC 2712 KerberosWrapper, as in:
 911             **
 912             **  Send ticket (copy to *p, set n = length)
 913             **  n = krb5_ap_req.length;
 914             **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 915             **  if (krb5_ap_req.data)
 916             **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 917             **
 918             **  Now using real RFC 2712 KerberosWrapper
 919             **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 920             **  Note: 2712 "opaque" types are here replaced
 921             **  with a 2-byte length followed by the value.
 922             **  Example:
 923             **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 924             **  Where "xx xx" = length bytes.  Shown here with
 925             **  optional authenticator omitted.
 926             */
 927
 928             /*  KerberosWrapper.Ticket              */
 929             s2n(enc_ticket->length, p);
 930             memcpy(p, enc_ticket->data, enc_ticket->length);
 931             p += enc_ticket->length;
 932             n = enc_ticket->length + 2;
 933
 934             /*  KerberosWrapper.Authenticator       */
 935             if (authp && authp->length) {
 936                 s2n(authp->length, p);
 937                 memcpy(p, authp->data, authp->length);
 938                 p += authp->length;
 939                 n += authp->length + 2;
 940
 941                 free(authp->data);
 942                 authp->data = NULL;
 943                 authp->length = 0;
 944             } else {
 945                 s2n(0, p);      /* null authenticator length */
 946                 n += 2;
 947             }
 948
 949             if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
 950                 goto err;
 951
 952             /*-
 953              *  20010420 VRS.  Tried it this way; failed.
 954              *      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 955              *      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 956              *                              kssl_ctx->length);
 957              *      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 958              */
 959
 960             memset(iv, 0, sizeof iv); /* per RFC 1510 */
 961             EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
 962             EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
 963                               sizeof tmp_buf);
 964             EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
 965             outl += padl;
 966             if (outl > sizeof epms) {
 967                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 968                        ERR_R_INTERNAL_ERROR);
 969                 goto err;
 970             }
 971             EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 972
 973             /*  KerberosWrapper.EncryptedPreMasterSecret    */
 974             s2n(outl, p);
 975             memcpy(p, epms, outl);
 976             p += outl;
 977             n += outl + 2;
 978
 979             s->session->master_key_length =
 980                 s->method->ssl3_enc->generate_master_secret(s,
 981                                                             s->
 982                                                             session->master_key,
 983                                                             tmp_buf,
 984                                                             sizeof tmp_buf);
 985
 986             OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 987             OPENSSL_cleanse(epms, outl);
 988         }
 989 #endif
 990 #ifndef OPENSSL_NO_DH
 991         else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
 992             DH *dh_srvr, *dh_clnt;
 993
 994             if (s->session->sess_cert == NULL) {
 995                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
 996                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 997                        SSL_R_UNEXPECTED_MESSAGE);
 998                 goto err;
 999             }
1000
1001             if (s->session->sess_cert->peer_dh_tmp != NULL)
1002                 dh_srvr = s->session->sess_cert->peer_dh_tmp;
1003             else {
1004                 /* we get them from the cert */
1005                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1006                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1007                        SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1008                 goto err;
1009             }
1010
1011             /* generate a new random key */
1012             if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1013                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1014                 goto err;
1015             }
1016             if (!DH_generate_key(dh_clnt)) {
1017                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1018                 goto err;
1019             }
1020
1021             /*
1022              * use the 'p' output buffer for the DH key, but make sure to
1023              * clear it out afterwards
1024              */
1025
1026             n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
1027
1028             if (n <= 0) {
1029                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1030                 goto err;
1031             }
1032
1033             /* generate master key from the result */
1034             s->session->master_key_length =
1035                 s->method->ssl3_enc->generate_master_secret(s,
1036                                                             s->
1037                                                             session->master_key,
1038                                                             p, n);
1039             /* clean up */
1040             memset(p, 0, n);
1041
1042             /* send off the data */
1043             n = BN_num_bytes(dh_clnt->pub_key);
1044             s2n(n, p);
1045             BN_bn2bin(dh_clnt->pub_key, p);
1046             n += 2;
1047
1048             DH_free(dh_clnt);
1049
1050             /* perhaps clean things up a bit EAY EAY EAY EAY */
1051         }
1052 #endif
1053         else {
1054             ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1055             SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1056                    ERR_R_INTERNAL_ERROR);
1057             goto err;
1058         }
1059
1060         d = dtls1_set_message_header(s, d,
1061                                      SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1062         /*-
1063          *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1064          l2n3(n,d);
1065          l2n(s->d1->handshake_write_seq,d);
1066          s->d1->handshake_write_seq++;
1067         */
1068
1069         s->state = SSL3_ST_CW_KEY_EXCH_B;
1070         /* number of bytes to write */
1071         s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1072         s->init_off = 0;
1073
1074         /* buffer the message to handle re-xmits */
1075         dtls1_buffer_message(s, 0);
1076     }
1077
1078     /* SSL3_ST_CW_KEY_EXCH_B */
1079     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1080  err:
1081     return (-1);
1082 }
1083
1084 int dtls1_send_client_verify(SSL *s)
1085 {
1086     unsigned char *p, *d;
1087     unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1088     EVP_PKEY *pkey;
1089 #ifndef OPENSSL_NO_RSA
1090     unsigned u = 0;
1091 #endif
1092     unsigned long n;
1093 #ifndef OPENSSL_NO_DSA
1094     int j;
1095 #endif
1096
1097     if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
1098         d = (unsigned char *)s->init_buf->data;
1099         p = &(d[DTLS1_HM_HEADER_LENGTH]);
1100         pkey = s->cert->key->privatekey;
1101
1102         s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
1103                                              &(data[MD5_DIGEST_LENGTH]));
1104
1105 #ifndef OPENSSL_NO_RSA
1106         if (pkey->type == EVP_PKEY_RSA) {
1107             s->method->ssl3_enc->cert_verify_mac(s,
1108                                                  &(s->s3->finish_dgst1),
1109                                                  &(data[0]));
1110             if (RSA_sign
1111                 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
1112                  &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1113                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
1114                 goto err;
1115             }
1116             s2n(u, p);
1117             n = u + 2;
1118         } else
1119 #endif
1120 #ifndef OPENSSL_NO_DSA
1121         if (pkey->type == EVP_PKEY_DSA) {
1122             if (!DSA_sign(pkey->save_type,
1123                           &(data[MD5_DIGEST_LENGTH]),
1124                           SHA_DIGEST_LENGTH, &(p[2]),
1125                           (unsigned int *)&j, pkey->pkey.dsa)) {
1126                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
1127                 goto err;
1128             }
1129             s2n(j, p);
1130             n = j + 2;
1131         } else
1132 #endif
1133         {
1134             SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
1135             goto err;
1136         }
1137
1138         d = dtls1_set_message_header(s, d,
1139                                      SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
1140
1141         s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
1142         s->init_off = 0;
1143
1144         /* buffer the message to handle re-xmits */
1145         dtls1_buffer_message(s, 0);
1146
1147         s->state = SSL3_ST_CW_CERT_VRFY_B;
1148     }
1149
1150     /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1151     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1152  err:
1153     return (-1);
1154 }
1155
1156 int dtls1_send_client_certificate(SSL *s)
1157 {
1158     X509 *x509 = NULL;
1159     EVP_PKEY *pkey = NULL;
1160     int i;
1161     unsigned long l;
1162
1163     if (s->state == SSL3_ST_CW_CERT_A) {
1164         if ((s->cert == NULL) ||
1165             (s->cert->key->x509 == NULL) ||
1166             (s->cert->key->privatekey == NULL))
1167             s->state = SSL3_ST_CW_CERT_B;
1168         else
1169             s->state = SSL3_ST_CW_CERT_C;
1170     }
1171
1172     /* We need to get a client cert */
1173     if (s->state == SSL3_ST_CW_CERT_B) {
1174         /*
1175          * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
1176          * return(-1); We then get retied later
1177          */
1178         i = 0;
1179         i = ssl_do_client_cert_cb(s, &x509, &pkey);
1180         if (i < 0) {
1181             s->rwstate = SSL_X509_LOOKUP;
1182             return (-1);
1183         }
1184         s->rwstate = SSL_NOTHING;
1185         if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
1186             s->state = SSL3_ST_CW_CERT_B;
1187             if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
1188                 i = 0;
1189         } else if (i == 1) {
1190             i = 0;
1191             SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
1192                    SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1193         }
1194
1195         if (x509 != NULL)
1196             X509_free(x509);
1197         if (pkey != NULL)
1198             EVP_PKEY_free(pkey);
1199         if (i == 0) {
1200             if (s->version == SSL3_VERSION) {
1201                 s->s3->tmp.cert_req = 0;
1202                 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
1203                 return (1);
1204             } else {
1205                 s->s3->tmp.cert_req = 2;
1206             }
1207         }
1208
1209         /* Ok, we have a cert */
1210         s->state = SSL3_ST_CW_CERT_C;
1211     }
1212
1213     if (s->state == SSL3_ST_CW_CERT_C) {
1214         s->state = SSL3_ST_CW_CERT_D;
1215         l = dtls1_output_cert_chain(s,
1216                                     (s->s3->tmp.cert_req ==
1217                                      2) ? NULL : s->cert->key->x509);
1218         s->init_num = (int)l;
1219         s->init_off = 0;
1220
1221         /* set header called by dtls1_output_cert_chain() */
1222
1223         /* buffer the message to handle re-xmits */
1224         dtls1_buffer_message(s, 0);
1225     }
1226     /* SSL3_ST_CW_CERT_D */
1227     return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1228 }