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                         /* Check if it is anon DH */
 287                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 288                                 {
 289                                 ret=ssl3_get_server_certificate(s);
 290                                 if (ret <= 0) goto end;
 291                                 }
 292                         else
 293                                 skip=1;
 294                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 295                         s->init_num=0;
 296                         break;
 297
 298                 case SSL3_ST_CR_KEY_EXCH_A:
 299                 case SSL3_ST_CR_KEY_EXCH_B:
 300                         ret=ssl3_get_key_exchange(s);
 301                         if (ret <= 0) goto end;
 302                         s->state=SSL3_ST_CR_CERT_REQ_A;
 303                         s->init_num=0;
 304
 305                         /* at this point we check that we have the
 306                          * required stuff from the server */
 307                         if (!ssl3_check_cert_and_algorithm(s))
 308                                 {
 309                                 ret= -1;
 310                                 goto end;
 311                                 }
 312                         break;
 313
 314                 case SSL3_ST_CR_CERT_REQ_A:
 315                 case SSL3_ST_CR_CERT_REQ_B:
 316                         ret=ssl3_get_certificate_request(s);
 317                         if (ret <= 0) goto end;
 318                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_CR_SRVR_DONE_A:
 323                 case SSL3_ST_CR_SRVR_DONE_B:
 324                         ret=ssl3_get_server_done(s);
 325                         if (ret <= 0) goto end;
 326                         if (s->s3->tmp.cert_req)
 327                                 s->state=SSL3_ST_CW_CERT_A;
 328                         else
 329                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 330                         s->init_num=0;
 331
 332                         break;
 333
 334                 case SSL3_ST_CW_CERT_A:
 335                 case SSL3_ST_CW_CERT_B:
 336                 case SSL3_ST_CW_CERT_C:
 337                 case SSL3_ST_CW_CERT_D:
 338                         dtls1_start_timer(s);
 339                         ret=dtls1_send_client_certificate(s);
 340                         if (ret <= 0) goto end;
 341                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 342                         s->init_num=0;
 343                         break;
 344
 345                 case SSL3_ST_CW_KEY_EXCH_A:
 346                 case SSL3_ST_CW_KEY_EXCH_B:
 347                         dtls1_start_timer(s);
 348                         ret=dtls1_send_client_key_exchange(s);
 349                         if (ret <= 0) goto end;
 350                         l=s->s3->tmp.new_cipher->algorithms;
 351                         /* EAY EAY EAY need to check for DH fix cert
 352                          * sent back */
 353                         /* For TLS, cert_req is set to 2, so a cert chain
 354                          * of nothing is sent, but no verify packet is sent */
 355                         if (s->s3->tmp.cert_req == 1)
 356                                 {
 357                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 358                                 }
 359                         else
 360                                 {
 361                                 s->state=SSL3_ST_CW_CHANGE_A;
 362                                 s->s3->change_cipher_spec=0;
 363                                 }
 364
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CW_CERT_VRFY_A:
 369                 case SSL3_ST_CW_CERT_VRFY_B:
 370                         dtls1_start_timer(s);
 371                         ret=dtls1_send_client_verify(s);
 372                         if (ret <= 0) goto end;
 373                         s->state=SSL3_ST_CW_CHANGE_A;
 374                         s->init_num=0;
 375                         s->s3->change_cipher_spec=0;
 376                         break;
 377
 378                 case SSL3_ST_CW_CHANGE_A:
 379                 case SSL3_ST_CW_CHANGE_B:
 380                         dtls1_start_timer(s);
 381                         ret=dtls1_send_change_cipher_spec(s,
 382                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 383                         if (ret <= 0) goto end;
 384                         s->state=SSL3_ST_CW_FINISHED_A;
 385                         s->init_num=0;
 386
 387                         s->session->cipher=s->s3->tmp.new_cipher;
 388 #ifdef OPENSSL_NO_COMP
 389                         s->session->compress_meth=0;
 390 #else
 391                         if (s->s3->tmp.new_compression == NULL)
 392                                 s->session->compress_meth=0;
 393                         else
 394                                 s->session->compress_meth=
 395                                         s->s3->tmp.new_compression->id;
 396 #endif
 397                         if (!s->method->ssl3_enc->setup_key_block(s))
 398                                 {
 399                                 ret= -1;
 400                                 goto end;
 401                                 }
 402
 403                         if (!s->method->ssl3_enc->change_cipher_state(s,
 404                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 405                                 {
 406                                 ret= -1;
 407                                 goto end;
 408                                 }
 409
 410                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 411                         break;
 412
 413                 case SSL3_ST_CW_FINISHED_A:
 414                 case SSL3_ST_CW_FINISHED_B:
 415                         dtls1_start_timer(s);
 416                         ret=dtls1_send_finished(s,
 417                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 418                                 s->method->ssl3_enc->client_finished_label,
 419                                 s->method->ssl3_enc->client_finished_label_len);
 420                         if (ret <= 0) goto end;
 421                         s->state=SSL3_ST_CW_FLUSH;
 422
 423                         /* clear flags */
 424                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 425                         if (s->hit)
 426                                 {
 427                                 s->s3->tmp.next_state=SSL_ST_OK;
 428                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 429                                         {
 430                                         s->state=SSL_ST_OK;
 431                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 432                                         s->s3->delay_buf_pop_ret=0;
 433                                         }
 434                                 }
 435                         else
 436                                 {
 437                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 438                                 }
 439                         s->init_num=0;
 440
 441                         break;
 442
 443                 case SSL3_ST_CR_FINISHED_A:
 444                 case SSL3_ST_CR_FINISHED_B:
 445                         s->d1->change_cipher_spec_ok = 1;
 446                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 447                                 SSL3_ST_CR_FINISHED_B);
 448                         if (ret <= 0) goto end;
 449                         dtls1_stop_timer(s);
 450
 451                         if (s->hit)
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                         else
 454                                 s->state=SSL_ST_OK;
 455                         s->init_num=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_FLUSH:
 459                         /* number of bytes to be flushed */
 460                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 461                         if (num1 > 0)
 462                                 {
 463                                 s->rwstate=SSL_WRITING;
 464                                 num1=BIO_flush(s->wbio);
 465                                 if (num1 <= 0) { ret= -1; goto end; }
 466                                 s->rwstate=SSL_NOTHING;
 467                                 }
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL_ST_OK:
 473                         /* clean a few things up */
 474                         ssl3_cleanup_key_block(s);
 475
 476 #if 0
 477                         if (s->init_buf != NULL)
 478                                 {
 479                                 BUF_MEM_free(s->init_buf);
 480                                 s->init_buf=NULL;
 481                                 }
 482 #endif
 483
 484                         /* If we are not 'joining' the last two packets,
 485                          * remove the buffering now */
 486                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 487                                 ssl_free_wbio_buffer(s);
 488                         /* else do it later in ssl3_write */
 489
 490                         s->init_num=0;
 491                         s->new_session=0;
 492
 493                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 494                         if (s->hit) s->ctx->stats.sess_hit++;
 495
 496                         ret=1;
 497                         /* s->server=0; */
 498                         s->handshake_func=dtls1_connect;
 499                         s->ctx->stats.sess_connect_good++;
 500
 501                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 502
 503                         /* done with handshaking */
 504                         s->d1->handshake_read_seq  = 0;
 505                         s->d1->next_handshake_write_seq = 0;
 506                         goto end;
 507                         /* break; */
 508
 509                 default:
 510                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 511                         ret= -1;
 512                         goto end;
 513                         /* break; */
 514                         }
 515
 516                 /* did we do anything */
 517                 if (!s->s3->tmp.reuse_message && !skip)
 518                         {
 519                         if (s->debug)
 520                                 {
 521                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 522                                         goto end;
 523                                 }
 524
 525                         if ((cb != NULL) && (s->state != state))
 526                                 {
 527                                 new_state=s->state;
 528                                 s->state=state;
 529                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 530                                 s->state=new_state;
 531                                 }
 532                         }
 533                 skip=0;
 534                 }
 535 end:
 536         s->in_handshake--;
 537         if (buf != NULL)
 538                 BUF_MEM_free(buf);
 539         if (cb != NULL)
 540                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 541         return(ret);
 542         }
 543
 544 int dtls1_client_hello(SSL *s)
 545         {
 546         unsigned char *buf;
 547         unsigned char *p,*d;
 548         unsigned int i,j;
 549         unsigned long Time,l;
 550         SSL_COMP *comp;
 551
 552         buf=(unsigned char *)s->init_buf->data;
 553         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 554                 {
 555                 if ((s->session == NULL) ||
 556                         (s->session->ssl_version != s->version) ||
 557                         (s->session->not_resumable))
 558                         {
 559                         if (!ssl_get_new_session(s,0))
 560                                 goto err;
 561                         }
 562                 /* else use the pre-loaded session */
 563
 564                 p=s->s3->client_random;
 565                 /* if client_random is initialized, reuse it, we are
 566                  * required to use same upon reply to HelloVerify */
 567                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 568                 if (i==sizeof(s->s3->client_random))
 569                         {
 570                         Time=(unsigned long)time(NULL); /* Time */
 571                         l2n(Time,p);
 572                         RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 573                         }
 574
 575                 /* Do the message type and length last */
 576                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 577
 578                 *(p++)=s->version>>8;
 579                 *(p++)=s->version&0xff;
 580                 s->client_version=s->version;
 581
 582                 /* Random stuff */
 583                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 584                 p+=SSL3_RANDOM_SIZE;
 585
 586                 /* Session ID */
 587                 if (s->new_session)
 588                         i=0;
 589                 else
 590                         i=s->session->session_id_length;
 591                 *(p++)=i;
 592                 if (i != 0)
 593                         {
 594                         if (i > sizeof s->session->session_id)
 595                                 {
 596                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 597                                 goto err;
 598                                 }
 599                         memcpy(p,s->session->session_id,i);
 600                         p+=i;
 601                         }
 602
 603                 /* cookie stuff */
 604                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 605                         {
 606                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 607                         goto err;
 608                         }
 609                 *(p++) = s->d1->cookie_len;
 610                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 611                 p += s->d1->cookie_len;
 612
 613                 /* Ciphers supported */
 614                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 615                 if (i == 0)
 616                         {
 617                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 618                         goto err;
 619                         }
 620                 s2n(i,p);
 621                 p+=i;
 622
 623                 /* COMPRESSION */
 624                 if (s->ctx->comp_methods == NULL)
 625                         j=0;
 626                 else
 627                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 628                 *(p++)=1+j;
 629                 for (i=0; i<j; i++)
 630                         {
 631                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 632                         *(p++)=comp->id;
 633                         }
 634                 *(p++)=0; /* Add the NULL method */
 635
 636 #ifndef OPENSSL_NO_TLSEXT
 637                 if ((p = ssl_add_clienthello_dtlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 638                         {
 639                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 640                         goto err;
 641                         }
 642 #endif
 643
 644                 l=(p-d);
 645                 d=buf;
 646
 647                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 648
 649                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 650                 /* number of bytes to write */
 651                 s->init_num=p-buf;
 652                 s->init_off=0;
 653
 654                 /* buffer the message to handle re-xmits */
 655                 dtls1_buffer_message(s, 0);
 656                 }
 657
 658         /* SSL3_ST_CW_CLNT_HELLO_B */
 659         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 660 err:
 661         return(-1);
 662         }
 663
 664 static int dtls1_get_hello_verify(SSL *s)
 665         {
 666         int n, al, ok = 0;
 667         unsigned char *data;
 668         unsigned int cookie_len;
 669
 670         n=s->method->ssl_get_message(s,
 671                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 672                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 673                 -1,
 674                 s->max_cert_list,
 675                 &ok);
 676
 677         if (!ok) return((int)n);
 678
 679         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 680                 {
 681                 s->d1->send_cookie = 0;
 682                 s->s3->tmp.reuse_message=1;
 683                 return(1);
 684                 }
 685
 686         data = (unsigned char *)s->init_msg;
 687
 688         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 689                 {
 690                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 691                 s->version=(s->version&0xff00)|data[1];
 692                 al = SSL_AD_PROTOCOL_VERSION;
 693                 goto f_err;
 694                 }
 695         data+=2;
 696
 697         cookie_len = *(data++);
 698         if ( cookie_len > sizeof(s->d1->cookie))
 699                 {
 700                 al=SSL_AD_ILLEGAL_PARAMETER;
 701                 goto f_err;
 702                 }
 703
 704         memcpy(s->d1->cookie, data, cookie_len);
 705         s->d1->cookie_len = cookie_len;
 706
 707         s->d1->send_cookie = 1;
 708         return 1;
 709
 710 f_err:
 711         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 712         return -1;
 713         }
 714
 715 int dtls1_send_client_key_exchange(SSL *s)
 716         {
 717         unsigned char *p,*d;
 718         int n;
 719         unsigned long l;
 720 #ifndef OPENSSL_NO_RSA
 721         unsigned char *q;
 722         EVP_PKEY *pkey=NULL;
 723 #endif
 724 #ifndef OPENSSL_NO_KRB5
 725         KSSL_ERR kssl_err;
 726 #endif /* OPENSSL_NO_KRB5 */
 727
 728         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 729                 {
 730                 d=(unsigned char *)s->init_buf->data;
 731                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 732
 733                 l=s->s3->tmp.new_cipher->algorithms;
 734
 735                 /* Fool emacs indentation */
 736                 if (0) {}
 737 #ifndef OPENSSL_NO_RSA
 738                 else if (l & SSL_kRSA)
 739                         {
 740                         RSA *rsa;
 741                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 742
 743                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 744                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 745                         else
 746                                 {
 747                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 748                                 if ((pkey == NULL) ||
 749                                         (pkey->type != EVP_PKEY_RSA) ||
 750                                         (pkey->pkey.rsa == NULL))
 751                                         {
 752                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 753                                         goto err;
 754                                         }
 755                                 rsa=pkey->pkey.rsa;
 756                                 EVP_PKEY_free(pkey);
 757                                 }
 758
 759                         tmp_buf[0]=s->client_version>>8;
 760                         tmp_buf[1]=s->client_version&0xff;
 761                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 762                                         goto err;
 763
 764                         s->session->master_key_length=sizeof tmp_buf;
 765
 766                         q=p;
 767                         /* Fix buf for TLS and [incidentally] DTLS */
 768                         if (s->version > SSL3_VERSION)
 769                                 p+=2;
 770                         n=RSA_public_encrypt(sizeof tmp_buf,
 771                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 772 #ifdef PKCS1_CHECK
 773                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 774                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 775 #endif
 776                         if (n <= 0)
 777                                 {
 778                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 779                                 goto err;
 780                                 }
 781
 782                         /* Fix buf for TLS and [incidentally] DTLS */
 783                         if (s->version > SSL3_VERSION)
 784                                 {
 785                                 s2n(n,q);
 786                                 n+=2;
 787                                 }
 788
 789                         s->session->master_key_length=
 790                                 s->method->ssl3_enc->generate_master_secret(s,
 791                                         s->session->master_key,
 792                                         tmp_buf,sizeof tmp_buf);
 793                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 794                         }
 795 #endif
 796 #ifndef OPENSSL_NO_KRB5
 797                 else if (l & SSL_kKRB5)
 798                         {
 799                         krb5_error_code krb5rc;
 800                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 801                         /*  krb5_data   krb5_ap_req;  */
 802                         krb5_data       *enc_ticket;
 803                         krb5_data       authenticator, *authp = NULL;
 804                         EVP_CIPHER_CTX  ciph_ctx;
 805                         EVP_CIPHER      *enc = NULL;
 806                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 807                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 808                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 809                                                 + EVP_MAX_IV_LENGTH];
 810                         int             padl, outl = sizeof(epms);
 811
 812                         EVP_CIPHER_CTX_init(&ciph_ctx);
 813
 814 #ifdef KSSL_DEBUG
 815                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 816                                 l, SSL_kKRB5);
 817 #endif  /* KSSL_DEBUG */
 818
 819                         authp = NULL;
 820 #ifdef KRB5SENDAUTH
 821                         if (KRB5SENDAUTH)  authp = &authenticator;
 822 #endif  /* KRB5SENDAUTH */
 823
 824                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 825                                 &kssl_err);
 826                         enc = kssl_map_enc(kssl_ctx->enctype);
 827                         if (enc == NULL)
 828                             goto err;
 829 #ifdef KSSL_DEBUG
 830                         {
 831                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 832                         if (krb5rc && kssl_err.text)
 833                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 834                         }
 835 #endif  /* KSSL_DEBUG */
 836
 837                         if (krb5rc)
 838                                 {
 839                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 840                                                 SSL_AD_HANDSHAKE_FAILURE);
 841                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 842                                                 kssl_err.reason);
 843                                 goto err;
 844                                 }
 845
 846                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 847                         **  in place of RFC 2712 KerberosWrapper, as in:
 848                         **
 849                         **  Send ticket (copy to *p, set n = length)
 850                         **  n = krb5_ap_req.length;
 851                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 852                         **  if (krb5_ap_req.data)
 853                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 854                         **
 855                         **  Now using real RFC 2712 KerberosWrapper
 856                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 857                         **  Note: 2712 "opaque" types are here replaced
 858                         **  with a 2-byte length followed by the value.
 859                         **  Example:
 860                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 861                         **  Where "xx xx" = length bytes.  Shown here with
 862                         **  optional authenticator omitted.
 863                         */
 864
 865                         /*  KerberosWrapper.Ticket              */
 866                         s2n(enc_ticket->length,p);
 867                         memcpy(p, enc_ticket->data, enc_ticket->length);
 868                         p+= enc_ticket->length;
 869                         n = enc_ticket->length + 2;
 870
 871                         /*  KerberosWrapper.Authenticator       */
 872                         if (authp  &&  authp->length)
 873                                 {
 874                                 s2n(authp->length,p);
 875                                 memcpy(p, authp->data, authp->length);
 876                                 p+= authp->length;
 877                                 n+= authp->length + 2;
 878
 879                                 free(authp->data);
 880                                 authp->data = NULL;
 881                                 authp->length = 0;
 882                                 }
 883                         else
 884                                 {
 885                                 s2n(0,p);/*  null authenticator length  */
 886                                 n+=2;
 887                                 }
 888
 889                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 890                             goto err;
 891
 892                         /*  20010420 VRS.  Tried it this way; failed.
 893                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 894                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 895                         **                              kssl_ctx->length);
 896                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 897                         */
 898
 899                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 900                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 901                                 kssl_ctx->key,iv);
 902                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 903                                 sizeof tmp_buf);
 904                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 905                         outl += padl;
 906                         if (outl > sizeof epms)
 907                                 {
 908                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 909                                 goto err;
 910                                 }
 911                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 912
 913                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 914                         s2n(outl,p);
 915                         memcpy(p, epms, outl);
 916                         p+=outl;
 917                         n+=outl + 2;
 918
 919                         s->session->master_key_length=
 920                                 s->method->ssl3_enc->generate_master_secret(s,
 921                                         s->session->master_key,
 922                                         tmp_buf, sizeof tmp_buf);
 923
 924                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 925                         OPENSSL_cleanse(epms, outl);
 926                         }
 927 #endif
 928 #ifndef OPENSSL_NO_DH
 929                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 930                         {
 931                         DH *dh_srvr,*dh_clnt;
 932
 933                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 934                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 935                         else
 936                                 {
 937                                 /* we get them from the cert */
 938                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 939                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 940                                 goto err;
 941                                 }
 942
 943                         /* generate a new random key */
 944                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 945                                 {
 946                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 947                                 goto err;
 948                                 }
 949                         if (!DH_generate_key(dh_clnt))
 950                                 {
 951                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 952                                 goto err;
 953                                 }
 954
 955                         /* use the 'p' output buffer for the DH key, but
 956                          * make sure to clear it out afterwards */
 957
 958                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 959
 960                         if (n <= 0)
 961                                 {
 962                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 963                                 goto err;
 964                                 }
 965
 966                         /* generate master key from the result */
 967                         s->session->master_key_length=
 968                                 s->method->ssl3_enc->generate_master_secret(s,
 969                                         s->session->master_key,p,n);
 970                         /* clean up */
 971                         memset(p,0,n);
 972
 973                         /* send off the data */
 974                         n=BN_num_bytes(dh_clnt->pub_key);
 975                         s2n(n,p);
 976                         BN_bn2bin(dh_clnt->pub_key,p);
 977                         n+=2;
 978
 979                         DH_free(dh_clnt);
 980
 981                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 982                         }
 983 #endif
 984                 else
 985                         {
 986                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 987                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 988                         goto err;
 989                         }
 990
 991                 d = dtls1_set_message_header(s, d,
 992                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 993                 /*
 994                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 995                  l2n3(n,d);
 996                  l2n(s->d1->handshake_write_seq,d);
 997                  s->d1->handshake_write_seq++;
 998                 */
 999
1000                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1001                 /* number of bytes to write */
1002                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1003                 s->init_off=0;
1004
1005                 /* buffer the message to handle re-xmits */
1006                 dtls1_buffer_message(s, 0);
1007                 }
1008
1009         /* SSL3_ST_CW_KEY_EXCH_B */
1010         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1011 err:
1012         return(-1);
1013         }
1014
1015 int dtls1_send_client_verify(SSL *s)
1016         {
1017         unsigned char *p,*d;
1018         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1019         EVP_PKEY *pkey;
1020 #ifndef OPENSSL_NO_RSA
1021         unsigned u=0;
1022 #endif
1023         unsigned long n;
1024 #ifndef OPENSSL_NO_DSA
1025         int j;
1026 #endif
1027
1028         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1029                 {
1030                 d=(unsigned char *)s->init_buf->data;
1031                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1032                 pkey=s->cert->key->privatekey;
1033
1034                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1035                         &(data[MD5_DIGEST_LENGTH]));
1036
1037 #ifndef OPENSSL_NO_RSA
1038                 if (pkey->type == EVP_PKEY_RSA)
1039                         {
1040                         s->method->ssl3_enc->cert_verify_mac(s,
1041                                 &(s->s3->finish_dgst1),&(data[0]));
1042                         if (RSA_sign(NID_md5_sha1, data,
1043                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1044                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1045                                 {
1046                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1047                                 goto err;
1048                                 }
1049                         s2n(u,p);
1050                         n=u+2;
1051                         }
1052                 else
1053 #endif
1054 #ifndef OPENSSL_NO_DSA
1055                         if (pkey->type == EVP_PKEY_DSA)
1056                         {
1057                         if (!DSA_sign(pkey->save_type,
1058                                 &(data[MD5_DIGEST_LENGTH]),
1059                                 SHA_DIGEST_LENGTH,&(p[2]),
1060                                 (unsigned int *)&j,pkey->pkey.dsa))
1061                                 {
1062                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1063                                 goto err;
1064                                 }
1065                         s2n(j,p);
1066                         n=j+2;
1067                         }
1068                 else
1069 #endif
1070                         {
1071                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1072                         goto err;
1073                         }
1074
1075                 d = dtls1_set_message_header(s, d,
1076                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1077
1078                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1079                 s->init_off=0;
1080
1081                 /* buffer the message to handle re-xmits */
1082                 dtls1_buffer_message(s, 0);
1083
1084                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1085                 }
1086
1087         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1088         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1089 err:
1090         return(-1);
1091         }
1092
1093 int dtls1_send_client_certificate(SSL *s)
1094         {
1095         X509 *x509=NULL;
1096         EVP_PKEY *pkey=NULL;
1097         int i;
1098         unsigned long l;
1099
1100         if (s->state == SSL3_ST_CW_CERT_A)
1101                 {
1102                 if ((s->cert == NULL) ||
1103                         (s->cert->key->x509 == NULL) ||
1104                         (s->cert->key->privatekey == NULL))
1105                         s->state=SSL3_ST_CW_CERT_B;
1106                 else
1107                         s->state=SSL3_ST_CW_CERT_C;
1108                 }
1109
1110         /* We need to get a client cert */
1111         if (s->state == SSL3_ST_CW_CERT_B)
1112                 {
1113                 /* If we get an error, we need to
1114                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1115                  * We then get retied later */
1116                 i=0;
1117                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1118                 if (i < 0)
1119                         {
1120                         s->rwstate=SSL_X509_LOOKUP;
1121                         return(-1);
1122                         }
1123                 s->rwstate=SSL_NOTHING;
1124                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1125                         {
1126                         s->state=SSL3_ST_CW_CERT_B;
1127                         if (    !SSL_use_certificate(s,x509) ||
1128                                 !SSL_use_PrivateKey(s,pkey))
1129                                 i=0;
1130                         }
1131                 else if (i == 1)
1132                         {
1133                         i=0;
1134                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1135                         }
1136
1137                 if (x509 != NULL) X509_free(x509);
1138                 if (pkey != NULL) EVP_PKEY_free(pkey);
1139                 if (i == 0)
1140                         {
1141                         if (s->version == SSL3_VERSION)
1142                                 {
1143                                 s->s3->tmp.cert_req=0;
1144                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1145                                 return(1);
1146                                 }
1147                         else
1148                                 {
1149                                 s->s3->tmp.cert_req=2;
1150                                 }
1151                         }
1152
1153                 /* Ok, we have a cert */
1154                 s->state=SSL3_ST_CW_CERT_C;
1155                 }
1156
1157         if (s->state == SSL3_ST_CW_CERT_C)
1158                 {
1159                 s->state=SSL3_ST_CW_CERT_D;
1160                 l=dtls1_output_cert_chain(s,
1161                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1162                 s->init_num=(int)l;
1163                 s->init_off=0;
1164
1165                 /* set header called by dtls1_output_cert_chain() */
1166
1167                 /* buffer the message to handle re-xmits */
1168                 dtls1_buffer_message(s, 0);
1169                 }
1170         /* SSL3_ST_CW_CERT_D */
1171         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1172         }
1173
1174