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                         break;
 224
 225                 case SSL3_ST_CW_CLNT_HELLO_A:
 226                 case SSL3_ST_CW_CLNT_HELLO_B:
 227
 228                         s->shutdown=0;
 229
 230                         /* every DTLS ClientHello resets Finished MAC */
 231                         ssl3_init_finished_mac(s);
 232
 233                         dtls1_start_timer(s);
 234                         ret=dtls1_client_hello(s);
 235                         if (ret <= 0) goto end;
 236
 237                         if ( s->d1->send_cookie)
 238                                 {
 239                                 s->state=SSL3_ST_CW_FLUSH;
 240                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 241                                 }
 242                         else
 243                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 244
 245                         s->init_num=0;
 246
 247                         /* turn on buffering for the next lot of output */
 248                         if (s->bbio != s->wbio)
 249                                 s->wbio=BIO_push(s->bbio,s->wbio);
 250
 251                         break;
 252
 253                 case SSL3_ST_CR_SRVR_HELLO_A:
 254                 case SSL3_ST_CR_SRVR_HELLO_B:
 255                         ret=ssl3_get_server_hello(s);
 256                         if (ret <= 0) goto end;
 257                         else
 258                                 {
 259                                 dtls1_stop_timer(s);
 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                         /* Check if it is anon DH */
 285                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 286                                 {
 287                                 ret=ssl3_get_server_certificate(s);
 288                                 if (ret <= 0) goto end;
 289                                 }
 290                         else
 291                                 skip=1;
 292                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 293                         s->init_num=0;
 294                         break;
 295
 296                 case SSL3_ST_CR_KEY_EXCH_A:
 297                 case SSL3_ST_CR_KEY_EXCH_B:
 298                         ret=ssl3_get_key_exchange(s);
 299                         if (ret <= 0) goto end;
 300                         s->state=SSL3_ST_CR_CERT_REQ_A;
 301                         s->init_num=0;
 302
 303                         /* at this point we check that we have the
 304                          * required stuff from the server */
 305                         if (!ssl3_check_cert_and_algorithm(s))
 306                                 {
 307                                 ret= -1;
 308                                 goto end;
 309                                 }
 310                         break;
 311
 312                 case SSL3_ST_CR_CERT_REQ_A:
 313                 case SSL3_ST_CR_CERT_REQ_B:
 314                         ret=ssl3_get_certificate_request(s);
 315                         if (ret <= 0) goto end;
 316                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 317                         s->init_num=0;
 318                         break;
 319
 320                 case SSL3_ST_CR_SRVR_DONE_A:
 321                 case SSL3_ST_CR_SRVR_DONE_B:
 322                         ret=ssl3_get_server_done(s);
 323                         if (ret <= 0) goto end;
 324                         if (s->s3->tmp.cert_req)
 325                                 s->state=SSL3_ST_CW_CERT_A;
 326                         else
 327                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 328                         s->init_num=0;
 329
 330                         break;
 331
 332                 case SSL3_ST_CW_CERT_A:
 333                 case SSL3_ST_CW_CERT_B:
 334                 case SSL3_ST_CW_CERT_C:
 335                 case SSL3_ST_CW_CERT_D:
 336                         dtls1_start_timer(s);
 337                         ret=dtls1_send_client_certificate(s);
 338                         if (ret <= 0) goto end;
 339                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 340                         s->init_num=0;
 341                         break;
 342
 343                 case SSL3_ST_CW_KEY_EXCH_A:
 344                 case SSL3_ST_CW_KEY_EXCH_B:
 345                         dtls1_start_timer(s);
 346                         ret=dtls1_send_client_key_exchange(s);
 347                         if (ret <= 0) goto end;
 348                         l=s->s3->tmp.new_cipher->algorithms;
 349                         /* EAY EAY EAY need to check for DH fix cert
 350                          * sent back */
 351                         /* For TLS, cert_req is set to 2, so a cert chain
 352                          * of nothing is sent, but no verify packet is sent */
 353                         if (s->s3->tmp.cert_req == 1)
 354                                 {
 355                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 356                                 }
 357                         else
 358                                 {
 359                                 s->state=SSL3_ST_CW_CHANGE_A;
 360                                 s->s3->change_cipher_spec=0;
 361                                 }
 362
 363                         s->init_num=0;
 364                         break;
 365
 366                 case SSL3_ST_CW_CERT_VRFY_A:
 367                 case SSL3_ST_CW_CERT_VRFY_B:
 368                         dtls1_start_timer(s);
 369                         ret=dtls1_send_client_verify(s);
 370                         if (ret <= 0) goto end;
 371                         s->state=SSL3_ST_CW_CHANGE_A;
 372                         s->init_num=0;
 373                         s->s3->change_cipher_spec=0;
 374                         break;
 375
 376                 case SSL3_ST_CW_CHANGE_A:
 377                 case SSL3_ST_CW_CHANGE_B:
 378                         dtls1_start_timer(s);
 379                         ret=dtls1_send_change_cipher_spec(s,
 380                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 381                         if (ret <= 0) goto end;
 382                         s->state=SSL3_ST_CW_FINISHED_A;
 383                         s->init_num=0;
 384
 385                         s->session->cipher=s->s3->tmp.new_cipher;
 386 #ifdef OPENSSL_NO_COMP
 387                         s->session->compress_meth=0;
 388 #else
 389                         if (s->s3->tmp.new_compression == NULL)
 390                                 s->session->compress_meth=0;
 391                         else
 392                                 s->session->compress_meth=
 393                                         s->s3->tmp.new_compression->id;
 394 #endif
 395                         if (!s->method->ssl3_enc->setup_key_block(s))
 396                                 {
 397                                 ret= -1;
 398                                 goto end;
 399                                 }
 400
 401                         if (!s->method->ssl3_enc->change_cipher_state(s,
 402                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 403                                 {
 404                                 ret= -1;
 405                                 goto end;
 406                                 }
 407
 408                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 409                         break;
 410
 411                 case SSL3_ST_CW_FINISHED_A:
 412                 case SSL3_ST_CW_FINISHED_B:
 413                         dtls1_start_timer(s);
 414                         ret=dtls1_send_finished(s,
 415                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 416                                 s->method->ssl3_enc->client_finished_label,
 417                                 s->method->ssl3_enc->client_finished_label_len);
 418                         if (ret <= 0) goto end;
 419                         s->state=SSL3_ST_CW_FLUSH;
 420
 421                         /* clear flags */
 422                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 423                         if (s->hit)
 424                                 {
 425                                 s->s3->tmp.next_state=SSL_ST_OK;
 426                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 427                                         {
 428                                         s->state=SSL_ST_OK;
 429                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 430                                         s->s3->delay_buf_pop_ret=0;
 431                                         }
 432                                 }
 433                         else
 434                                 {
 435                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 436                                 }
 437                         s->init_num=0;
 438
 439                         break;
 440
 441                 case SSL3_ST_CR_FINISHED_A:
 442                 case SSL3_ST_CR_FINISHED_B:
 443                         s->d1->change_cipher_spec_ok = 1;
 444                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 445                                 SSL3_ST_CR_FINISHED_B);
 446                         if (ret <= 0) goto end;
 447                         dtls1_stop_timer(s);
 448
 449                         if (s->hit)
 450                                 s->state=SSL3_ST_CW_CHANGE_A;
 451                         else
 452                                 s->state=SSL_ST_OK;
 453                         s->init_num=0;
 454                         break;
 455
 456                 case SSL3_ST_CW_FLUSH:
 457                         /* number of bytes to be flushed */
 458                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 459                         if (num1 > 0)
 460                                 {
 461                                 s->rwstate=SSL_WRITING;
 462                                 num1=BIO_flush(s->wbio);
 463                                 if (num1 <= 0) { ret= -1; goto end; }
 464                                 s->rwstate=SSL_NOTHING;
 465                                 }
 466
 467                         s->state=s->s3->tmp.next_state;
 468                         break;
 469
 470                 case SSL_ST_OK:
 471                         /* clean a few things up */
 472                         ssl3_cleanup_key_block(s);
 473
 474 #if 0
 475                         if (s->init_buf != NULL)
 476                                 {
 477                                 BUF_MEM_free(s->init_buf);
 478                                 s->init_buf=NULL;
 479                                 }
 480 #endif
 481
 482                         /* If we are not 'joining' the last two packets,
 483                          * remove the buffering now */
 484                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 485                                 ssl_free_wbio_buffer(s);
 486                         /* else do it later in ssl3_write */
 487
 488                         s->init_num=0;
 489                         s->new_session=0;
 490
 491                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 492                         if (s->hit) s->ctx->stats.sess_hit++;
 493
 494                         ret=1;
 495                         /* s->server=0; */
 496                         s->handshake_func=dtls1_connect;
 497                         s->ctx->stats.sess_connect_good++;
 498
 499                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 500
 501                         /* done with handshaking */
 502                         s->d1->handshake_read_seq  = 0;
 503                         s->d1->next_handshake_write_seq = 0;
 504                         goto end;
 505                         /* break; */
 506
 507                 default:
 508                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 509                         ret= -1;
 510                         goto end;
 511                         /* break; */
 512                         }
 513
 514                 /* did we do anything */
 515                 if (!s->s3->tmp.reuse_message && !skip)
 516                         {
 517                         if (s->debug)
 518                                 {
 519                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 520                                         goto end;
 521                                 }
 522
 523                         if ((cb != NULL) && (s->state != state))
 524                                 {
 525                                 new_state=s->state;
 526                                 s->state=state;
 527                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 528                                 s->state=new_state;
 529                                 }
 530                         }
 531                 skip=0;
 532                 }
 533 end:
 534         s->in_handshake--;
 535         if (buf != NULL)
 536                 BUF_MEM_free(buf);
 537         if (cb != NULL)
 538                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 539         return(ret);
 540         }
 541
 542 int dtls1_client_hello(SSL *s)
 543         {
 544         unsigned char *buf;
 545         unsigned char *p,*d;
 546         unsigned int i,j;
 547         unsigned long Time,l;
 548         SSL_COMP *comp;
 549
 550         buf=(unsigned char *)s->init_buf->data;
 551         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 552                 {
 553                 if ((s->session == NULL) ||
 554                         (s->session->ssl_version != s->version) ||
 555                         (s->session->not_resumable))
 556                         {
 557                         if (!ssl_get_new_session(s,0))
 558                                 goto err;
 559                         }
 560                 /* else use the pre-loaded session */
 561
 562                 p=s->s3->client_random;
 563                 /* if client_random is initialized, reuse it, we are
 564                  * required to use same upon reply to HelloVerify */
 565                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 566                 if (i==sizeof(s->s3->client_random))
 567                         {
 568                         Time=(unsigned long)time(NULL); /* Time */
 569                         l2n(Time,p);
 570                         RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 571                         }
 572
 573                 /* Do the message type and length last */
 574                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 575
 576                 *(p++)=s->version>>8;
 577                 *(p++)=s->version&0xff;
 578                 s->client_version=s->version;
 579
 580                 /* Random stuff */
 581                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 582                 p+=SSL3_RANDOM_SIZE;
 583
 584                 /* Session ID */
 585                 if (s->new_session)
 586                         i=0;
 587                 else
 588                         i=s->session->session_id_length;
 589                 *(p++)=i;
 590                 if (i != 0)
 591                         {
 592                         if (i > sizeof s->session->session_id)
 593                                 {
 594                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 595                                 goto err;
 596                                 }
 597                         memcpy(p,s->session->session_id,i);
 598                         p+=i;
 599                         }
 600
 601                 /* cookie stuff */
 602                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 603                         {
 604                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 605                         goto err;
 606                         }
 607                 *(p++) = s->d1->cookie_len;
 608                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 609                 p += s->d1->cookie_len;
 610
 611                 /* Ciphers supported */
 612                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 613                 if (i == 0)
 614                         {
 615                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 616                         goto err;
 617                         }
 618                 s2n(i,p);
 619                 p+=i;
 620
 621                 /* COMPRESSION */
 622                 if (s->ctx->comp_methods == NULL)
 623                         j=0;
 624                 else
 625                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 626                 *(p++)=1+j;
 627                 for (i=0; i<j; i++)
 628                         {
 629                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 630                         *(p++)=comp->id;
 631                         }
 632                 *(p++)=0; /* Add the NULL method */
 633
 634                 l=(p-d);
 635                 d=buf;
 636
 637                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 638
 639                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 640                 /* number of bytes to write */
 641                 s->init_num=p-buf;
 642                 s->init_off=0;
 643
 644                 /* buffer the message to handle re-xmits */
 645                 dtls1_buffer_message(s, 0);
 646                 }
 647
 648         /* SSL3_ST_CW_CLNT_HELLO_B */
 649         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 650 err:
 651         return(-1);
 652         }
 653
 654 static int dtls1_get_hello_verify(SSL *s)
 655         {
 656         int n, al, ok = 0;
 657         unsigned char *data;
 658         unsigned int cookie_len;
 659
 660         n=s->method->ssl_get_message(s,
 661                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 662                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 663                 -1,
 664                 s->max_cert_list,
 665                 &ok);
 666
 667         if (!ok) return((int)n);
 668
 669         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 670                 {
 671                 s->d1->send_cookie = 0;
 672                 s->s3->tmp.reuse_message=1;
 673                 return(1);
 674                 }
 675
 676         data = (unsigned char *)s->init_msg;
 677
 678         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 679                 {
 680                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 681                 s->version=(s->version&0xff00)|data[1];
 682                 al = SSL_AD_PROTOCOL_VERSION;
 683                 goto f_err;
 684                 }
 685         data+=2;
 686
 687         cookie_len = *(data++);
 688         if ( cookie_len > sizeof(s->d1->cookie))
 689                 {
 690                 al=SSL_AD_ILLEGAL_PARAMETER;
 691                 goto f_err;
 692                 }
 693
 694         memcpy(s->d1->cookie, data, cookie_len);
 695         s->d1->cookie_len = cookie_len;
 696
 697         s->d1->send_cookie = 1;
 698         return 1;
 699
 700 f_err:
 701         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 702         return -1;
 703         }
 704
 705 int dtls1_send_client_key_exchange(SSL *s)
 706         {
 707         unsigned char *p,*d;
 708         int n;
 709         unsigned long l;
 710 #ifndef OPENSSL_NO_RSA
 711         unsigned char *q;
 712         EVP_PKEY *pkey=NULL;
 713 #endif
 714 #ifndef OPENSSL_NO_KRB5
 715         KSSL_ERR kssl_err;
 716 #endif /* OPENSSL_NO_KRB5 */
 717
 718         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 719                 {
 720                 d=(unsigned char *)s->init_buf->data;
 721                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 722
 723                 l=s->s3->tmp.new_cipher->algorithms;
 724
 725                 /* Fool emacs indentation */
 726                 if (0) {}
 727 #ifndef OPENSSL_NO_RSA
 728                 else if (l & SSL_kRSA)
 729                         {
 730                         RSA *rsa;
 731                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 732
 733                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 734                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 735                         else
 736                                 {
 737                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 738                                 if ((pkey == NULL) ||
 739                                         (pkey->type != EVP_PKEY_RSA) ||
 740                                         (pkey->pkey.rsa == NULL))
 741                                         {
 742                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 743                                         goto err;
 744                                         }
 745                                 rsa=pkey->pkey.rsa;
 746                                 EVP_PKEY_free(pkey);
 747                                 }
 748
 749                         tmp_buf[0]=s->client_version>>8;
 750                         tmp_buf[1]=s->client_version&0xff;
 751                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 752                                         goto err;
 753
 754                         s->session->master_key_length=sizeof tmp_buf;
 755
 756                         q=p;
 757                         /* Fix buf for TLS and [incidentally] DTLS */
 758                         if (s->version > SSL3_VERSION)
 759                                 p+=2;
 760                         n=RSA_public_encrypt(sizeof tmp_buf,
 761                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 762 #ifdef PKCS1_CHECK
 763                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 764                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 765 #endif
 766                         if (n <= 0)
 767                                 {
 768                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 769                                 goto err;
 770                                 }
 771
 772                         /* Fix buf for TLS and [incidentally] DTLS */
 773                         if (s->version > SSL3_VERSION)
 774                                 {
 775                                 s2n(n,q);
 776                                 n+=2;
 777                                 }
 778
 779                         s->session->master_key_length=
 780                                 s->method->ssl3_enc->generate_master_secret(s,
 781                                         s->session->master_key,
 782                                         tmp_buf,sizeof tmp_buf);
 783                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 784                         }
 785 #endif
 786 #ifndef OPENSSL_NO_KRB5
 787                 else if (l & SSL_kKRB5)
 788                         {
 789                         krb5_error_code krb5rc;
 790                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 791                         /*  krb5_data   krb5_ap_req;  */
 792                         krb5_data       *enc_ticket;
 793                         krb5_data       authenticator, *authp = NULL;
 794                         EVP_CIPHER_CTX  ciph_ctx;
 795                         EVP_CIPHER      *enc = NULL;
 796                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 797                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 798                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 799                                                 + EVP_MAX_IV_LENGTH];
 800                         int             padl, outl = sizeof(epms);
 801
 802                         EVP_CIPHER_CTX_init(&ciph_ctx);
 803
 804 #ifdef KSSL_DEBUG
 805                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 806                                 l, SSL_kKRB5);
 807 #endif  /* KSSL_DEBUG */
 808
 809                         authp = NULL;
 810 #ifdef KRB5SENDAUTH
 811                         if (KRB5SENDAUTH)  authp = &authenticator;
 812 #endif  /* KRB5SENDAUTH */
 813
 814                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 815                                 &kssl_err);
 816                         enc = kssl_map_enc(kssl_ctx->enctype);
 817                         if (enc == NULL)
 818                             goto err;
 819 #ifdef KSSL_DEBUG
 820                         {
 821                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 822                         if (krb5rc && kssl_err.text)
 823                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 824                         }
 825 #endif  /* KSSL_DEBUG */
 826
 827                         if (krb5rc)
 828                                 {
 829                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 830                                                 SSL_AD_HANDSHAKE_FAILURE);
 831                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 832                                                 kssl_err.reason);
 833                                 goto err;
 834                                 }
 835
 836                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 837                         **  in place of RFC 2712 KerberosWrapper, as in:
 838                         **
 839                         **  Send ticket (copy to *p, set n = length)
 840                         **  n = krb5_ap_req.length;
 841                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 842                         **  if (krb5_ap_req.data)
 843                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 844                         **
 845                         **  Now using real RFC 2712 KerberosWrapper
 846                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 847                         **  Note: 2712 "opaque" types are here replaced
 848                         **  with a 2-byte length followed by the value.
 849                         **  Example:
 850                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 851                         **  Where "xx xx" = length bytes.  Shown here with
 852                         **  optional authenticator omitted.
 853                         */
 854
 855                         /*  KerberosWrapper.Ticket              */
 856                         s2n(enc_ticket->length,p);
 857                         memcpy(p, enc_ticket->data, enc_ticket->length);
 858                         p+= enc_ticket->length;
 859                         n = enc_ticket->length + 2;
 860
 861                         /*  KerberosWrapper.Authenticator       */
 862                         if (authp  &&  authp->length)
 863                                 {
 864                                 s2n(authp->length,p);
 865                                 memcpy(p, authp->data, authp->length);
 866                                 p+= authp->length;
 867                                 n+= authp->length + 2;
 868
 869                                 free(authp->data);
 870                                 authp->data = NULL;
 871                                 authp->length = 0;
 872                                 }
 873                         else
 874                                 {
 875                                 s2n(0,p);/*  null authenticator length  */
 876                                 n+=2;
 877                                 }
 878
 879                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 880                             goto err;
 881
 882                         /*  20010420 VRS.  Tried it this way; failed.
 883                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 884                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 885                         **                              kssl_ctx->length);
 886                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 887                         */
 888
 889                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 890                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 891                                 kssl_ctx->key,iv);
 892                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 893                                 sizeof tmp_buf);
 894                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 895                         outl += padl;
 896                         if (outl > sizeof epms)
 897                                 {
 898                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 899                                 goto err;
 900                                 }
 901                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 902
 903                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 904                         s2n(outl,p);
 905                         memcpy(p, epms, outl);
 906                         p+=outl;
 907                         n+=outl + 2;
 908
 909                         s->session->master_key_length=
 910                                 s->method->ssl3_enc->generate_master_secret(s,
 911                                         s->session->master_key,
 912                                         tmp_buf, sizeof tmp_buf);
 913
 914                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 915                         OPENSSL_cleanse(epms, outl);
 916                         }
 917 #endif
 918 #ifndef OPENSSL_NO_DH
 919                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 920                         {
 921                         DH *dh_srvr,*dh_clnt;
 922
 923                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 924                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 925                         else
 926                                 {
 927                                 /* we get them from the cert */
 928                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 929                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 930                                 goto err;
 931                                 }
 932
 933                         /* generate a new random key */
 934                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 935                                 {
 936                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 937                                 goto err;
 938                                 }
 939                         if (!DH_generate_key(dh_clnt))
 940                                 {
 941                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 942                                 goto err;
 943                                 }
 944
 945                         /* use the 'p' output buffer for the DH key, but
 946                          * make sure to clear it out afterwards */
 947
 948                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 949
 950                         if (n <= 0)
 951                                 {
 952                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 953                                 goto err;
 954                                 }
 955
 956                         /* generate master key from the result */
 957                         s->session->master_key_length=
 958                                 s->method->ssl3_enc->generate_master_secret(s,
 959                                         s->session->master_key,p,n);
 960                         /* clean up */
 961                         memset(p,0,n);
 962
 963                         /* send off the data */
 964                         n=BN_num_bytes(dh_clnt->pub_key);
 965                         s2n(n,p);
 966                         BN_bn2bin(dh_clnt->pub_key,p);
 967                         n+=2;
 968
 969                         DH_free(dh_clnt);
 970
 971                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 972                         }
 973 #endif
 974                 else
 975                         {
 976                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 977                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 978                         goto err;
 979                         }
 980
 981                 d = dtls1_set_message_header(s, d,
 982                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 983                 /*
 984                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 985                  l2n3(n,d);
 986                  l2n(s->d1->handshake_write_seq,d);
 987                  s->d1->handshake_write_seq++;
 988                 */
 989
 990                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 991                 /* number of bytes to write */
 992                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 993                 s->init_off=0;
 994
 995                 /* buffer the message to handle re-xmits */
 996                 dtls1_buffer_message(s, 0);
 997                 }
 998
 999         /* SSL3_ST_CW_KEY_EXCH_B */
1000         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1001 err:
1002         return(-1);
1003         }
1004
1005 int dtls1_send_client_verify(SSL *s)
1006         {
1007         unsigned char *p,*d;
1008         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1009         EVP_PKEY *pkey;
1010 #ifndef OPENSSL_NO_RSA
1011         unsigned u=0;
1012 #endif
1013         unsigned long n;
1014 #ifndef OPENSSL_NO_DSA
1015         int j;
1016 #endif
1017
1018         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1019                 {
1020                 d=(unsigned char *)s->init_buf->data;
1021                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1022                 pkey=s->cert->key->privatekey;
1023
1024                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1025                         &(data[MD5_DIGEST_LENGTH]));
1026
1027 #ifndef OPENSSL_NO_RSA
1028                 if (pkey->type == EVP_PKEY_RSA)
1029                         {
1030                         s->method->ssl3_enc->cert_verify_mac(s,
1031                                 &(s->s3->finish_dgst1),&(data[0]));
1032                         if (RSA_sign(NID_md5_sha1, data,
1033                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1034                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1035                                 {
1036                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1037                                 goto err;
1038                                 }
1039                         s2n(u,p);
1040                         n=u+2;
1041                         }
1042                 else
1043 #endif
1044 #ifndef OPENSSL_NO_DSA
1045                         if (pkey->type == EVP_PKEY_DSA)
1046                         {
1047                         if (!DSA_sign(pkey->save_type,
1048                                 &(data[MD5_DIGEST_LENGTH]),
1049                                 SHA_DIGEST_LENGTH,&(p[2]),
1050                                 (unsigned int *)&j,pkey->pkey.dsa))
1051                                 {
1052                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1053                                 goto err;
1054                                 }
1055                         s2n(j,p);
1056                         n=j+2;
1057                         }
1058                 else
1059 #endif
1060                         {
1061                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1062                         goto err;
1063                         }
1064
1065                 d = dtls1_set_message_header(s, d,
1066                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1067
1068                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1069                 s->init_off=0;
1070
1071                 /* buffer the message to handle re-xmits */
1072                 dtls1_buffer_message(s, 0);
1073
1074                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1075                 }
1076
1077         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1078         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1079 err:
1080         return(-1);
1081         }
1082
1083 int dtls1_send_client_certificate(SSL *s)
1084         {
1085         X509 *x509=NULL;
1086         EVP_PKEY *pkey=NULL;
1087         int i;
1088         unsigned long l;
1089
1090         if (s->state == SSL3_ST_CW_CERT_A)
1091                 {
1092                 if ((s->cert == NULL) ||
1093                         (s->cert->key->x509 == NULL) ||
1094                         (s->cert->key->privatekey == NULL))
1095                         s->state=SSL3_ST_CW_CERT_B;
1096                 else
1097                         s->state=SSL3_ST_CW_CERT_C;
1098                 }
1099
1100         /* We need to get a client cert */
1101         if (s->state == SSL3_ST_CW_CERT_B)
1102                 {
1103                 /* If we get an error, we need to
1104                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1105                  * We then get retied later */
1106                 i=0;
1107                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1108                 if (i < 0)
1109                         {
1110                         s->rwstate=SSL_X509_LOOKUP;
1111                         return(-1);
1112                         }
1113                 s->rwstate=SSL_NOTHING;
1114                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1115                         {
1116                         s->state=SSL3_ST_CW_CERT_B;
1117                         if (    !SSL_use_certificate(s,x509) ||
1118                                 !SSL_use_PrivateKey(s,pkey))
1119                                 i=0;
1120                         }
1121                 else if (i == 1)
1122                         {
1123                         i=0;
1124                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1125                         }
1126
1127                 if (x509 != NULL) X509_free(x509);
1128                 if (pkey != NULL) EVP_PKEY_free(pkey);
1129                 if (i == 0)
1130                         {
1131                         if (s->version == SSL3_VERSION)
1132                                 {
1133                                 s->s3->tmp.cert_req=0;
1134                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1135                                 return(1);
1136                                 }
1137                         else
1138                                 {
1139                                 s->s3->tmp.cert_req=2;
1140                                 }
1141                         }
1142
1143                 /* Ok, we have a cert */
1144                 s->state=SSL3_ST_CW_CERT_C;
1145                 }
1146
1147         if (s->state == SSL3_ST_CW_CERT_C)
1148                 {
1149                 s->state=SSL3_ST_CW_CERT_D;
1150                 l=dtls1_output_cert_chain(s,
1151                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1152                 s->init_num=(int)l;
1153                 s->init_off=0;
1154
1155                 /* set header called by dtls1_output_cert_chain() */
1156
1157                 /* buffer the message to handle re-xmits */
1158                 dtls1_buffer_message(s, 0);
1159                 }
1160         /* SSL3_ST_CW_CERT_D */
1161         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1162         }
1163
1164