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,
 142                         dtls1_get_client_method)
 143
 144 int dtls1_connect(SSL *s)
 145         {
 146         BUF_MEM *buf=NULL;
 147         unsigned long Time=(unsigned long)time(NULL),l;
 148         long num1;
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         int ret= -1;
 151         int new_state,state,skip=0;;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         s->in_handshake++;
 163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 164
 165         for (;;)
 166                 {
 167                 state=s->state;
 168
 169                 switch(s->state)
 170                         {
 171                 case SSL_ST_RENEGOTIATE:
 172                         s->new_session=1;
 173                         s->state=SSL_ST_CONNECT;
 174                         s->ctx->stats.sess_connect_renegotiate++;
 175                         /* break */
 176                 case SSL_ST_BEFORE:
 177                 case SSL_ST_CONNECT:
 178                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 179                 case SSL_ST_OK|SSL_ST_CONNECT:
 180
 181                         s->server=0;
 182                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 183
 184                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 185                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 186                                 {
 187                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 188                                 ret = -1;
 189                                 goto end;
 190                                 }
 191
 192                         /* s->version=SSL3_VERSION; */
 193                         s->type=SSL_ST_CONNECT;
 194
 195                         if (s->init_buf == NULL)
 196                                 {
 197                                 if ((buf=BUF_MEM_new()) == NULL)
 198                                         {
 199                                         ret= -1;
 200                                         goto end;
 201                                         }
 202                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 203                                         {
 204                                         ret= -1;
 205                                         goto end;
 206                                         }
 207                                 s->init_buf=buf;
 208                                 buf=NULL;
 209                                 }
 210
 211                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 212
 213                         /* setup buffing BIO */
 214                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 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) goto end;
 238
 239                         if ( s->d1->send_cookie)
 240                                 {
 241                                 s->state=SSL3_ST_CW_FLUSH;
 242                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 243                                 }
 244                         else
 245                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 246
 247                         s->init_num=0;
 248
 249                         /* turn on buffering for the next lot of output */
 250                         if (s->bbio != s->wbio)
 251                                 s->wbio=BIO_push(s->bbio,s->wbio);
 252
 253                         break;
 254
 255                 case SSL3_ST_CR_SRVR_HELLO_A:
 256                 case SSL3_ST_CR_SRVR_HELLO_B:
 257                         ret=ssl3_get_server_hello(s);
 258                         if (ret <= 0) goto end;
 259                         else
 260                                 {
 261                                 dtls1_stop_timer(s);
 262                                 if (s->hit)
 263                                         s->state=SSL3_ST_CR_FINISHED_A;
 264                                 else
 265                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 266                                 }
 267                         s->init_num=0;
 268                         break;
 269
 270                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 271                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 272
 273                         ret = dtls1_get_hello_verify(s);
 274                         if ( ret <= 0)
 275                                 goto end;
 276                         dtls1_stop_timer(s);
 277                         if ( s->d1->send_cookie) /* start again, with a cookie */
 278                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 279                         else
 280                                 s->state = SSL3_ST_CR_CERT_A;
 281                         s->init_num = 0;
 282                         break;
 283
 284                 case SSL3_ST_CR_CERT_A:
 285                 case SSL3_ST_CR_CERT_B:
 286 #ifndef OPENSSL_NO_TLSEXT
 287                         ret=ssl3_check_finished(s);
 288                         if (ret <= 0) goto end;
 289                         if (ret == 2)
 290                                 {
 291                                 s->hit = 1;
 292                                 if (s->tlsext_ticket_expected)
 293                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 294                                 else
 295                                         s->state=SSL3_ST_CR_FINISHED_A;
 296                                 s->init_num=0;
 297                                 break;
 298                                 }
 299 #endif
 300                         /* Check if it is anon DH */
 301                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 302                                 {
 303                                 ret=ssl3_get_server_certificate(s);
 304                                 if (ret <= 0) goto end;
 305 #ifndef OPENSSL_NO_TLSEXT
 306                                 if (s->tlsext_status_expected)
 307                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 308                                 else
 309                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 310                                 }
 311                         else
 312                                 {
 313                                 skip = 1;
 314                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 315                                 }
 316 #else
 317                                 }
 318                         else
 319                                 skip=1;
 320
 321                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 322 #endif
 323                         s->init_num=0;
 324                         break;
 325
 326                 case SSL3_ST_CR_KEY_EXCH_A:
 327                 case SSL3_ST_CR_KEY_EXCH_B:
 328                         ret=ssl3_get_key_exchange(s);
 329                         if (ret <= 0) goto end;
 330                         s->state=SSL3_ST_CR_CERT_REQ_A;
 331                         s->init_num=0;
 332
 333                         /* at this point we check that we have the
 334                          * required stuff from the server */
 335                         if (!ssl3_check_cert_and_algorithm(s))
 336                                 {
 337                                 ret= -1;
 338                                 goto end;
 339                                 }
 340                         break;
 341
 342                 case SSL3_ST_CR_CERT_REQ_A:
 343                 case SSL3_ST_CR_CERT_REQ_B:
 344                         ret=ssl3_get_certificate_request(s);
 345                         if (ret <= 0) goto end;
 346                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 347                         s->init_num=0;
 348                         break;
 349
 350                 case SSL3_ST_CR_SRVR_DONE_A:
 351                 case SSL3_ST_CR_SRVR_DONE_B:
 352                         ret=ssl3_get_server_done(s);
 353                         if (ret <= 0) goto end;
 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) goto end;
 369                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 370                         s->init_num=0;
 371                         break;
 372
 373                 case SSL3_ST_CW_KEY_EXCH_A:
 374                 case SSL3_ST_CW_KEY_EXCH_B:
 375                         dtls1_start_timer(s);
 376                         ret=dtls1_send_client_key_exchange(s);
 377                         if (ret <= 0) goto end;
 378                         l=s->s3->tmp.new_cipher->algorithms;
 379                         /* EAY EAY EAY need to check for DH fix cert
 380                          * sent back */
 381                         /* For TLS, cert_req is set to 2, so a cert chain
 382                          * of nothing is sent, but no verify packet is sent */
 383                         if (s->s3->tmp.cert_req == 1)
 384                                 {
 385                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 386                                 }
 387                         else
 388                                 {
 389                                 s->state=SSL3_ST_CW_CHANGE_A;
 390                                 s->s3->change_cipher_spec=0;
 391                                 }
 392
 393                         s->init_num=0;
 394                         break;
 395
 396                 case SSL3_ST_CW_CERT_VRFY_A:
 397                 case SSL3_ST_CW_CERT_VRFY_B:
 398                         dtls1_start_timer(s);
 399                         ret=dtls1_send_client_verify(s);
 400                         if (ret <= 0) goto end;
 401                         s->state=SSL3_ST_CW_CHANGE_A;
 402                         s->init_num=0;
 403                         s->s3->change_cipher_spec=0;
 404                         break;
 405
 406                 case SSL3_ST_CW_CHANGE_A:
 407                 case SSL3_ST_CW_CHANGE_B:
 408                         dtls1_start_timer(s);
 409                         ret=dtls1_send_change_cipher_spec(s,
 410                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 411                         if (ret <= 0) goto end;
 412                         s->state=SSL3_ST_CW_FINISHED_A;
 413                         s->init_num=0;
 414
 415                         s->session->cipher=s->s3->tmp.new_cipher;
 416 #ifdef OPENSSL_NO_COMP
 417                         s->session->compress_meth=0;
 418 #else
 419                         if (s->s3->tmp.new_compression == NULL)
 420                                 s->session->compress_meth=0;
 421                         else
 422                                 s->session->compress_meth=
 423                                         s->s3->tmp.new_compression->id;
 424 #endif
 425                         if (!s->method->ssl3_enc->setup_key_block(s))
 426                                 {
 427                                 ret= -1;
 428                                 goto end;
 429                                 }
 430
 431                         if (!s->method->ssl3_enc->change_cipher_state(s,
 432                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 433                                 {
 434                                 ret= -1;
 435                                 goto end;
 436                                 }
 437
 438                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 439                         break;
 440
 441                 case SSL3_ST_CW_FINISHED_A:
 442                 case SSL3_ST_CW_FINISHED_B:
 443                         dtls1_start_timer(s);
 444                         ret=dtls1_send_finished(s,
 445                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 446                                 s->method->ssl3_enc->client_finished_label,
 447                                 s->method->ssl3_enc->client_finished_label_len);
 448                         if (ret <= 0) goto end;
 449                         s->state=SSL3_ST_CW_FLUSH;
 450
 451                         /* clear flags */
 452                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 453                         if (s->hit)
 454                                 {
 455                                 s->s3->tmp.next_state=SSL_ST_OK;
 456                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 457                                         {
 458                                         s->state=SSL_ST_OK;
 459                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 460                                         s->s3->delay_buf_pop_ret=0;
 461                                         }
 462                                 }
 463                         else
 464                                 {
 465 #ifndef OPENSSL_NO_TLSEXT
 466                                 /* Allow NewSessionTicket if ticket expected */
 467                                 if (s->tlsext_ticket_expected)
 468                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 469                                 else
 470 #endif
 471
 472                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 473                                 }
 474                         s->init_num=0;
 475
 476                         break;
 477
 478 #ifndef OPENSSL_NO_TLSEXT
 479                 case SSL3_ST_CR_SESSION_TICKET_A:
 480                 case SSL3_ST_CR_SESSION_TICKET_B:
 481                         ret=ssl3_get_new_session_ticket(s);
 482                         if (ret <= 0) goto end;
 483                         s->state=SSL3_ST_CR_FINISHED_A;
 484                         s->init_num=0;
 485                 break;
 486
 487                 case SSL3_ST_CR_CERT_STATUS_A:
 488                 case SSL3_ST_CR_CERT_STATUS_B:
 489                         ret=ssl3_get_cert_status(s);
 490                         if (ret <= 0) goto end;
 491                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 492                         s->init_num=0;
 493                 break;
 494 #endif
 495
 496                 case SSL3_ST_CR_FINISHED_A:
 497                 case SSL3_ST_CR_FINISHED_B:
 498                         s->d1->change_cipher_spec_ok = 1;
 499                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 500                                 SSL3_ST_CR_FINISHED_B);
 501                         if (ret <= 0) goto end;
 502                         dtls1_stop_timer(s);
 503
 504                         if (s->hit)
 505                                 s->state=SSL3_ST_CW_CHANGE_A;
 506                         else
 507                                 s->state=SSL_ST_OK;
 508                         s->init_num=0;
 509                         break;
 510
 511                 case SSL3_ST_CW_FLUSH:
 512                         /* number of bytes to be flushed */
 513                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 514                         if (num1 > 0)
 515                                 {
 516                                 s->rwstate=SSL_WRITING;
 517                                 num1=BIO_flush(s->wbio);
 518                                 if (num1 <= 0) { ret= -1; goto end; }
 519                                 s->rwstate=SSL_NOTHING;
 520                                 }
 521
 522                         s->state=s->s3->tmp.next_state;
 523                         break;
 524
 525                 case SSL_ST_OK:
 526                         /* clean a few things up */
 527                         ssl3_cleanup_key_block(s);
 528
 529 #if 0
 530                         if (s->init_buf != NULL)
 531                                 {
 532                                 BUF_MEM_free(s->init_buf);
 533                                 s->init_buf=NULL;
 534                                 }
 535 #endif
 536
 537                         /* If we are not 'joining' the last two packets,
 538                          * remove the buffering now */
 539                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 540                                 ssl_free_wbio_buffer(s);
 541                         /* else do it later in ssl3_write */
 542
 543                         s->init_num=0;
 544                         s->new_session=0;
 545
 546                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 547                         if (s->hit) s->ctx->stats.sess_hit++;
 548
 549                         ret=1;
 550                         /* s->server=0; */
 551                         s->handshake_func=dtls1_connect;
 552                         s->ctx->stats.sess_connect_good++;
 553
 554                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 555
 556                         /* done with handshaking */
 557                         s->d1->handshake_read_seq  = 0;
 558                         s->d1->next_handshake_write_seq = 0;
 559                         goto end;
 560                         /* break; */
 561
 562                 default:
 563                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 564                         ret= -1;
 565                         goto end;
 566                         /* break; */
 567                         }
 568
 569                 /* did we do anything */
 570                 if (!s->s3->tmp.reuse_message && !skip)
 571                         {
 572                         if (s->debug)
 573                                 {
 574                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 575                                         goto end;
 576                                 }
 577
 578                         if ((cb != NULL) && (s->state != state))
 579                                 {
 580                                 new_state=s->state;
 581                                 s->state=state;
 582                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 583                                 s->state=new_state;
 584                                 }
 585                         }
 586                 skip=0;
 587                 }
 588 end:
 589         s->in_handshake--;
 590         if (buf != NULL)
 591                 BUF_MEM_free(buf);
 592         if (cb != NULL)
 593                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 594         return(ret);
 595         }
 596
 597 int dtls1_client_hello(SSL *s)
 598         {
 599         unsigned char *buf;
 600         unsigned char *p,*d;
 601         unsigned int i,j;
 602         unsigned long Time,l;
 603         SSL_COMP *comp;
 604
 605         buf=(unsigned char *)s->init_buf->data;
 606         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 607                 {
 608                 SSL_SESSION *sess = s->session;
 609                 if ((s->session == NULL) ||
 610                         (s->session->ssl_version != s->version) ||
 611 #ifdef OPENSSL_NO_TLSEXT
 612                         !sess->session_id_length ||
 613 #else
 614                         (!sess->session_id_length && !sess->tlsext_tick) ||
 615 #endif
 616                         (s->session->not_resumable))
 617                         {
 618                         if (!ssl_get_new_session(s,0))
 619                                 goto err;
 620                         }
 621                 /* else use the pre-loaded session */
 622
 623                 p=s->s3->client_random;
 624                 /* if client_random is initialized, reuse it, we are
 625                  * required to use same upon reply to HelloVerify */
 626                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 627                 if (i==sizeof(s->s3->client_random))
 628                         {
 629                         Time=(unsigned long)time(NULL); /* Time */
 630                         l2n(Time,p);
 631                         RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 632                         }
 633
 634                 /* Do the message type and length last */
 635                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 636
 637                 *(p++)=s->version>>8;
 638                 *(p++)=s->version&0xff;
 639                 s->client_version=s->version;
 640
 641                 /* Random stuff */
 642                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 643                 p+=SSL3_RANDOM_SIZE;
 644
 645                 /* Session ID */
 646                 if (s->new_session)
 647                         i=0;
 648                 else
 649                         i=s->session->session_id_length;
 650                 *(p++)=i;
 651                 if (i != 0)
 652                         {
 653                         if (i > sizeof s->session->session_id)
 654                                 {
 655                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 656                                 goto err;
 657                                 }
 658                         memcpy(p,s->session->session_id,i);
 659                         p+=i;
 660                         }
 661
 662                 /* cookie stuff */
 663                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 664                         {
 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                         {
 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                         {
 690                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 691                         *(p++)=comp->id;
 692                         }
 693                 *(p++)=0; /* Add the NULL method */
 694
 695 #ifndef OPENSSL_NO_TLSEXT
 696                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 697                         {
 698                         SSLerr(SSL_F_SSL3_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,
 733                 s->max_cert_list,
 734                 &ok);
 735
 736         if (!ok) return((int)n);
 737
 738         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 739                 {
 740                 s->d1->send_cookie = 0;
 741                 s->s3->tmp.reuse_message=1;
 742                 return(1);
 743                 }
 744
 745         data = (unsigned char *)s->init_msg;
 746
 747         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 748                 {
 749                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 750                 s->version=(s->version&0xff00)|data[1];
 751                 al = SSL_AD_PROTOCOL_VERSION;
 752                 goto f_err;
 753                 }
 754         data+=2;
 755
 756         cookie_len = *(data++);
 757         if ( cookie_len > sizeof(s->d1->cookie))
 758                 {
 759                 al=SSL_AD_ILLEGAL_PARAMETER;
 760                 goto f_err;
 761                 }
 762
 763         memcpy(s->d1->cookie, data, cookie_len);
 764         s->d1->cookie_len = cookie_len;
 765
 766         s->d1->send_cookie = 1;
 767         return 1;
 768
 769 f_err:
 770         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 771         return -1;
 772         }
 773
 774 int dtls1_send_client_key_exchange(SSL *s)
 775         {
 776         unsigned char *p,*d;
 777         int n;
 778         unsigned long l;
 779 #ifndef OPENSSL_NO_RSA
 780         unsigned char *q;
 781         EVP_PKEY *pkey=NULL;
 782 #endif
 783 #ifndef OPENSSL_NO_KRB5
 784         KSSL_ERR kssl_err;
 785 #endif /* OPENSSL_NO_KRB5 */
 786
 787         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 788                 {
 789                 d=(unsigned char *)s->init_buf->data;
 790                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 791
 792                 l=s->s3->tmp.new_cipher->algorithms;
 793
 794                 /* Fool emacs indentation */
 795                 if (0) {}
 796 #ifndef OPENSSL_NO_RSA
 797                 else if (l & SSL_kRSA)
 798                         {
 799                         RSA *rsa;
 800                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 801
 802                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 803                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 804                         else
 805                                 {
 806                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 807                                 if ((pkey == NULL) ||
 808                                         (pkey->type != EVP_PKEY_RSA) ||
 809                                         (pkey->pkey.rsa == NULL))
 810                                         {
 811                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 812                                         goto err;
 813                                         }
 814                                 rsa=pkey->pkey.rsa;
 815                                 EVP_PKEY_free(pkey);
 816                                 }
 817
 818                         tmp_buf[0]=s->client_version>>8;
 819                         tmp_buf[1]=s->client_version&0xff;
 820                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 821                                         goto err;
 822
 823                         s->session->master_key_length=sizeof tmp_buf;
 824
 825                         q=p;
 826                         /* Fix buf for TLS and [incidentally] DTLS */
 827                         if (s->version > SSL3_VERSION)
 828                                 p+=2;
 829                         n=RSA_public_encrypt(sizeof tmp_buf,
 830                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 831 #ifdef PKCS1_CHECK
 832                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 833                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 834 #endif
 835                         if (n <= 0)
 836                                 {
 837                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 838                                 goto err;
 839                                 }
 840
 841                         /* Fix buf for TLS and [incidentally] DTLS */
 842                         if (s->version > SSL3_VERSION)
 843                                 {
 844                                 s2n(n,q);
 845                                 n+=2;
 846                                 }
 847
 848                         s->session->master_key_length=
 849                                 s->method->ssl3_enc->generate_master_secret(s,
 850                                         s->session->master_key,
 851                                         tmp_buf,sizeof tmp_buf);
 852                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 853                         }
 854 #endif
 855 #ifndef OPENSSL_NO_KRB5
 856                 else if (l & SSL_kKRB5)
 857                         {
 858                         krb5_error_code krb5rc;
 859                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 860                         /*  krb5_data   krb5_ap_req;  */
 861                         krb5_data       *enc_ticket;
 862                         krb5_data       authenticator, *authp = NULL;
 863                         EVP_CIPHER_CTX  ciph_ctx;
 864                         EVP_CIPHER      *enc = NULL;
 865                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 866                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 867                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 868                                                 + EVP_MAX_IV_LENGTH];
 869                         int             padl, outl = sizeof(epms);
 870
 871                         EVP_CIPHER_CTX_init(&ciph_ctx);
 872
 873 #ifdef KSSL_DEBUG
 874                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 875                                 l, SSL_kKRB5);
 876 #endif  /* KSSL_DEBUG */
 877
 878                         authp = NULL;
 879 #ifdef KRB5SENDAUTH
 880                         if (KRB5SENDAUTH)  authp = &authenticator;
 881 #endif  /* KRB5SENDAUTH */
 882
 883                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 884                                 &kssl_err);
 885                         enc = kssl_map_enc(kssl_ctx->enctype);
 886                         if (enc == NULL)
 887                             goto err;
 888 #ifdef KSSL_DEBUG
 889                         {
 890                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 891                         if (krb5rc && kssl_err.text)
 892                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 893                         }
 894 #endif  /* KSSL_DEBUG */
 895
 896                         if (krb5rc)
 897                                 {
 898                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 899                                                 SSL_AD_HANDSHAKE_FAILURE);
 900                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 901                                                 kssl_err.reason);
 902                                 goto err;
 903                                 }
 904
 905                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 906                         **  in place of RFC 2712 KerberosWrapper, as in:
 907                         **
 908                         **  Send ticket (copy to *p, set n = length)
 909                         **  n = krb5_ap_req.length;
 910                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 911                         **  if (krb5_ap_req.data)
 912                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 913                         **
 914                         **  Now using real RFC 2712 KerberosWrapper
 915                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 916                         **  Note: 2712 "opaque" types are here replaced
 917                         **  with a 2-byte length followed by the value.
 918                         **  Example:
 919                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 920                         **  Where "xx xx" = length bytes.  Shown here with
 921                         **  optional authenticator omitted.
 922                         */
 923
 924                         /*  KerberosWrapper.Ticket              */
 925                         s2n(enc_ticket->length,p);
 926                         memcpy(p, enc_ticket->data, enc_ticket->length);
 927                         p+= enc_ticket->length;
 928                         n = enc_ticket->length + 2;
 929
 930                         /*  KerberosWrapper.Authenticator       */
 931                         if (authp  &&  authp->length)
 932                                 {
 933                                 s2n(authp->length,p);
 934                                 memcpy(p, authp->data, authp->length);
 935                                 p+= authp->length;
 936                                 n+= authp->length + 2;
 937
 938                                 free(authp->data);
 939                                 authp->data = NULL;
 940                                 authp->length = 0;
 941                                 }
 942                         else
 943                                 {
 944                                 s2n(0,p);/*  null authenticator length  */
 945                                 n+=2;
 946                                 }
 947
 948                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 949                             goto err;
 950
 951                         /*  20010420 VRS.  Tried it this way; failed.
 952                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 953                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 954                         **                              kssl_ctx->length);
 955                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 956                         */
 957
 958                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 959                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 960                                 kssl_ctx->key,iv);
 961                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 962                                 sizeof tmp_buf);
 963                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 964                         outl += padl;
 965                         if (outl > sizeof epms)
 966                                 {
 967                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 968                                 goto err;
 969                                 }
 970                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 971
 972                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 973                         s2n(outl,p);
 974                         memcpy(p, epms, outl);
 975                         p+=outl;
 976                         n+=outl + 2;
 977
 978                         s->session->master_key_length=
 979                                 s->method->ssl3_enc->generate_master_secret(s,
 980                                         s->session->master_key,
 981                                         tmp_buf, sizeof tmp_buf);
 982
 983                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 984                         OPENSSL_cleanse(epms, outl);
 985                         }
 986 #endif
 987 #ifndef OPENSSL_NO_DH
 988                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 989                         {
 990                         DH *dh_srvr,*dh_clnt;
 991
 992                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 993                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 994                         else
 995                                 {
 996                                 /* we get them from the cert */
 997                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 998                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 999                                 goto err;
1000                                 }
1001
1002                         /* generate a new random key */
1003                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1004                                 {
1005                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1006                                 goto err;
1007                                 }
1008                         if (!DH_generate_key(dh_clnt))
1009                                 {
1010                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1011                                 goto err;
1012                                 }
1013
1014                         /* use the 'p' output buffer for the DH key, but
1015                          * make sure to clear it out afterwards */
1016
1017                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1018
1019                         if (n <= 0)
1020                                 {
1021                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1022                                 goto err;
1023                                 }
1024
1025                         /* generate master key from the result */
1026                         s->session->master_key_length=
1027                                 s->method->ssl3_enc->generate_master_secret(s,
1028                                         s->session->master_key,p,n);
1029                         /* clean up */
1030                         memset(p,0,n);
1031
1032                         /* send off the data */
1033                         n=BN_num_bytes(dh_clnt->pub_key);
1034                         s2n(n,p);
1035                         BN_bn2bin(dh_clnt->pub_key,p);
1036                         n+=2;
1037
1038                         DH_free(dh_clnt);
1039
1040                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1041                         }
1042 #endif
1043                 else
1044                         {
1045                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1046                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1047                         goto err;
1048                         }
1049
1050                 d = dtls1_set_message_header(s, d,
1051                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1052                 /*
1053                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1054                  l2n3(n,d);
1055                  l2n(s->d1->handshake_write_seq,d);
1056                  s->d1->handshake_write_seq++;
1057                 */
1058
1059                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1060                 /* number of bytes to write */
1061                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1062                 s->init_off=0;
1063
1064                 /* buffer the message to handle re-xmits */
1065                 dtls1_buffer_message(s, 0);
1066                 }
1067
1068         /* SSL3_ST_CW_KEY_EXCH_B */
1069         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1070 err:
1071         return(-1);
1072         }
1073
1074 int dtls1_send_client_verify(SSL *s)
1075         {
1076         unsigned char *p,*d;
1077         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1078         EVP_PKEY *pkey;
1079 #ifndef OPENSSL_NO_RSA
1080         unsigned u=0;
1081 #endif
1082         unsigned long n;
1083 #ifndef OPENSSL_NO_DSA
1084         int j;
1085 #endif
1086
1087         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1088                 {
1089                 d=(unsigned char *)s->init_buf->data;
1090                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1091                 pkey=s->cert->key->privatekey;
1092
1093                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1094                         &(data[MD5_DIGEST_LENGTH]));
1095
1096 #ifndef OPENSSL_NO_RSA
1097                 if (pkey->type == EVP_PKEY_RSA)
1098                         {
1099                         s->method->ssl3_enc->cert_verify_mac(s,
1100                                 &(s->s3->finish_dgst1),&(data[0]));
1101                         if (RSA_sign(NID_md5_sha1, data,
1102                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1103                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1104                                 {
1105                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1106                                 goto err;
1107                                 }
1108                         s2n(u,p);
1109                         n=u+2;
1110                         }
1111                 else
1112 #endif
1113 #ifndef OPENSSL_NO_DSA
1114                         if (pkey->type == EVP_PKEY_DSA)
1115                         {
1116                         if (!DSA_sign(pkey->save_type,
1117                                 &(data[MD5_DIGEST_LENGTH]),
1118                                 SHA_DIGEST_LENGTH,&(p[2]),
1119                                 (unsigned int *)&j,pkey->pkey.dsa))
1120                                 {
1121                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1122                                 goto err;
1123                                 }
1124                         s2n(j,p);
1125                         n=j+2;
1126                         }
1127                 else
1128 #endif
1129                         {
1130                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1131                         goto err;
1132                         }
1133
1134                 d = dtls1_set_message_header(s, d,
1135                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1136
1137                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1138                 s->init_off=0;
1139
1140                 /* buffer the message to handle re-xmits */
1141                 dtls1_buffer_message(s, 0);
1142
1143                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1144                 }
1145
1146         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1147         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1148 err:
1149         return(-1);
1150         }
1151
1152 int dtls1_send_client_certificate(SSL *s)
1153         {
1154         X509 *x509=NULL;
1155         EVP_PKEY *pkey=NULL;
1156         int i;
1157         unsigned long l;
1158
1159         if (s->state == SSL3_ST_CW_CERT_A)
1160                 {
1161                 if ((s->cert == NULL) ||
1162                         (s->cert->key->x509 == NULL) ||
1163                         (s->cert->key->privatekey == NULL))
1164                         s->state=SSL3_ST_CW_CERT_B;
1165                 else
1166                         s->state=SSL3_ST_CW_CERT_C;
1167                 }
1168
1169         /* We need to get a client cert */
1170         if (s->state == SSL3_ST_CW_CERT_B)
1171                 {
1172                 /* If we get an error, we need to
1173                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1174                  * We then get retied later */
1175                 i=0;
1176                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1177                 if (i < 0)
1178                         {
1179                         s->rwstate=SSL_X509_LOOKUP;
1180                         return(-1);
1181                         }
1182                 s->rwstate=SSL_NOTHING;
1183                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1184                         {
1185                         s->state=SSL3_ST_CW_CERT_B;
1186                         if (    !SSL_use_certificate(s,x509) ||
1187                                 !SSL_use_PrivateKey(s,pkey))
1188                                 i=0;
1189                         }
1190                 else if (i == 1)
1191                         {
1192                         i=0;
1193                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1194                         }
1195
1196                 if (x509 != NULL) X509_free(x509);
1197                 if (pkey != NULL) EVP_PKEY_free(pkey);
1198                 if (i == 0)
1199                         {
1200                         if (s->version == SSL3_VERSION)
1201                                 {
1202                                 s->s3->tmp.cert_req=0;
1203                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1204                                 return(1);
1205                                 }
1206                         else
1207                                 {
1208                                 s->s3->tmp.cert_req=2;
1209                                 }
1210                         }
1211
1212                 /* Ok, we have a cert */
1213                 s->state=SSL3_ST_CW_CERT_C;
1214                 }
1215
1216         if (s->state == SSL3_ST_CW_CERT_C)
1217                 {
1218                 s->state=SSL3_ST_CW_CERT_D;
1219                 l=dtls1_output_cert_chain(s,
1220                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1221                 s->init_num=(int)l;
1222                 s->init_off=0;
1223
1224                 /* set header called by dtls1_output_cert_chain() */
1225
1226                 /* buffer the message to handle re-xmits */
1227                 dtls1_buffer_message(s, 0);
1228                 }
1229         /* SSL3_ST_CW_CERT_D */
1230         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1231         }
1232
1233