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) 1999-2007 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 #ifndef OPENSSL_NO_KRB5
 119 #include "kssl_lcl.h"
 120 #endif
 121 #include <openssl/buffer.h>
 122 #include <openssl/rand.h>
 123 #include <openssl/objects.h>
 124 #include <openssl/evp.h>
 125 #include <openssl/md5.h>
 126 #include <openssl/bn.h>
 127 #ifndef OPENSSL_NO_DH
 128 #include <openssl/dh.h>
 129 #endif
 130
 131 static const SSL_METHOD *dtls1_get_client_method(int ver);
 132 static int dtls1_get_hello_verify(SSL *s);
 133
 134 static const SSL_METHOD *dtls1_get_client_method(int ver)
 135         {
 136         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
 137                 return(DTLSv1_client_method());
 138         else
 139                 return(NULL);
 140         }
 141
 142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
 143                         ssl_undefined_function,
 144                         dtls1_connect,
 145                         dtls1_get_client_method)
 146
 147 int dtls1_connect(SSL *s)
 148         {
 149         BUF_MEM *buf=NULL;
 150         unsigned long Time=(unsigned long)time(NULL);
 151         long num1;
 152         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 153         int ret= -1;
 154         int new_state,state,skip=0;;
 155
 156         RAND_add(&Time,sizeof(Time),0);
 157         ERR_clear_error();
 158         clear_sys_error();
 159
 160         if (s->info_callback != NULL)
 161                 cb=s->info_callback;
 162         else if (s->ctx->info_callback != NULL)
 163                 cb=s->ctx->info_callback;
 164
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         for (;;)
 169                 {
 170                 state=s->state;
 171
 172                 switch(s->state)
 173                         {
 174                 case SSL_ST_RENEGOTIATE:
 175                         s->new_session=1;
 176                         s->state=SSL_ST_CONNECT;
 177                         s->ctx->stats.sess_connect_renegotiate++;
 178                         /* break */
 179                 case SSL_ST_BEFORE:
 180                 case SSL_ST_CONNECT:
 181                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 182                 case SSL_ST_OK|SSL_ST_CONNECT:
 183
 184                         s->server=0;
 185                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 186
 187                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 188                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 189                                 {
 190                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 191                                 ret = -1;
 192                                 goto end;
 193                                 }
 194
 195                         /* s->version=SSL3_VERSION; */
 196                         s->type=SSL_ST_CONNECT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 buf=NULL;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 215
 216                         /* setup buffing BIO */
 217                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 218
 219                         /* don't push the buffering BIO quite yet */
 220
 221                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 222                         s->ctx->stats.sess_connect++;
 223                         s->init_num=0;
 224                         /* mark client_random uninitialized */
 225                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 226                         break;
 227
 228                 case SSL3_ST_CW_CLNT_HELLO_A:
 229                 case SSL3_ST_CW_CLNT_HELLO_B:
 230
 231                         s->shutdown=0;
 232
 233                         /* every DTLS ClientHello resets Finished MAC */
 234                         ssl3_init_finished_mac(s);
 235
 236                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 237                         ret=dtls1_client_hello(s);
 238                         if (ret <= 0) goto end;
 239
 240                         if ( s->d1->send_cookie)
 241                                 {
 242                                 s->state=SSL3_ST_CW_FLUSH;
 243                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 244                                 }
 245                         else
 246                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 247
 248                         s->init_num=0;
 249
 250                         /* turn on buffering for the next lot of output */
 251                         if (s->bbio != s->wbio)
 252                                 s->wbio=BIO_push(s->bbio,s->wbio);
 253
 254                         break;
 255
 256                 case SSL3_ST_CR_SRVR_HELLO_A:
 257                 case SSL3_ST_CR_SRVR_HELLO_B:
 258                         ret=ssl3_get_server_hello(s);
 259                         if (ret <= 0) goto end;
 260                         else
 261                                 {
 262                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 263                                 if (s->hit)
 264                                         s->state=SSL3_ST_CR_FINISHED_A;
 265                                 else
 266                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 267                                 }
 268                         s->init_num=0;
 269                         break;
 270
 271                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 272                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 273
 274                         ret = dtls1_get_hello_verify(s);
 275                         if ( ret <= 0)
 276                                 goto end;
 277                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 278                         if ( s->d1->send_cookie) /* start again, with a cookie */
 279                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 280                         else
 281                                 s->state = SSL3_ST_CR_CERT_A;
 282                         s->init_num = 0;
 283                         break;
 284
 285                 case SSL3_ST_CR_CERT_A:
 286                 case SSL3_ST_CR_CERT_B:
 287                         /* Check if it is anon DH */
 288                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 289                                 {
 290                                 ret=ssl3_get_server_certificate(s);
 291                                 if (ret <= 0) goto end;
 292                                 }
 293                         else
 294                                 skip=1;
 295                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 296                         s->init_num=0;
 297                         break;
 298
 299                 case SSL3_ST_CR_KEY_EXCH_A:
 300                 case SSL3_ST_CR_KEY_EXCH_B:
 301                         ret=ssl3_get_key_exchange(s);
 302                         if (ret <= 0) goto end;
 303                         s->state=SSL3_ST_CR_CERT_REQ_A;
 304                         s->init_num=0;
 305
 306                         /* at this point we check that we have the
 307                          * required stuff from the server */
 308                         if (!ssl3_check_cert_and_algorithm(s))
 309                                 {
 310                                 ret= -1;
 311                                 goto end;
 312                                 }
 313                         break;
 314
 315                 case SSL3_ST_CR_CERT_REQ_A:
 316                 case SSL3_ST_CR_CERT_REQ_B:
 317                         ret=ssl3_get_certificate_request(s);
 318                         if (ret <= 0) goto end;
 319                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 320                         s->init_num=0;
 321                         break;
 322
 323                 case SSL3_ST_CR_SRVR_DONE_A:
 324                 case SSL3_ST_CR_SRVR_DONE_B:
 325                         ret=ssl3_get_server_done(s);
 326                         if (ret <= 0) goto end;
 327                         if (s->s3->tmp.cert_req)
 328                                 s->state=SSL3_ST_CW_CERT_A;
 329                         else
 330                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 331                         s->init_num=0;
 332
 333                         break;
 334
 335                 case SSL3_ST_CW_CERT_A:
 336                 case SSL3_ST_CW_CERT_B:
 337                 case SSL3_ST_CW_CERT_C:
 338                 case SSL3_ST_CW_CERT_D:
 339                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 340                         ret=dtls1_send_client_certificate(s);
 341                         if (ret <= 0) goto end;
 342                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_CW_KEY_EXCH_A:
 347                 case SSL3_ST_CW_KEY_EXCH_B:
 348                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 349                         ret=dtls1_send_client_key_exchange(s);
 350                         if (ret <= 0) goto end;
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 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                         break;
 441
 442                 case SSL3_ST_CR_FINISHED_A:
 443                 case SSL3_ST_CR_FINISHED_B:
 444
 445                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 446                                 SSL3_ST_CR_FINISHED_B);
 447                         if (ret <= 0) goto end;
 448                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 449
 450                         if (s->hit)
 451                                 s->state=SSL3_ST_CW_CHANGE_A;
 452                         else
 453                                 s->state=SSL_ST_OK;
 454                         s->init_num=0;
 455                         break;
 456
 457                 case SSL3_ST_CW_FLUSH:
 458                         /* number of bytes to be flushed */
 459                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 460                         if (num1 > 0)
 461                                 {
 462                                 s->rwstate=SSL_WRITING;
 463                                 num1=BIO_flush(s->wbio);
 464                                 if (num1 <= 0) { ret= -1; goto end; }
 465                                 s->rwstate=SSL_NOTHING;
 466                                 }
 467
 468                         s->state=s->s3->tmp.next_state;
 469                         break;
 470
 471                 case SSL_ST_OK:
 472                         /* clean a few things up */
 473                         ssl3_cleanup_key_block(s);
 474
 475 #if 0
 476                         if (s->init_buf != NULL)
 477                                 {
 478                                 BUF_MEM_free(s->init_buf);
 479                                 s->init_buf=NULL;
 480                                 }
 481 #endif
 482
 483                         /* If we are not 'joining' the last two packets,
 484                          * remove the buffering now */
 485                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 486                                 ssl_free_wbio_buffer(s);
 487                         /* else do it later in ssl3_write */
 488
 489                         s->init_num=0;
 490                         s->new_session=0;
 491
 492                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 493                         if (s->hit) s->ctx->stats.sess_hit++;
 494
 495                         ret=1;
 496                         /* s->server=0; */
 497                         s->handshake_func=dtls1_connect;
 498                         s->ctx->stats.sess_connect_good++;
 499
 500                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 501
 502                         /* done with handshaking */
 503                         s->d1->handshake_read_seq  = 0;
 504                         s->d1->next_handshake_write_seq = 0;
 505                         goto end;
 506                         /* break; */
 507
 508                 default:
 509                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 510                         ret= -1;
 511                         goto end;
 512                         /* break; */
 513                         }
 514
 515                 /* did we do anything */
 516                 if (!s->s3->tmp.reuse_message && !skip)
 517                         {
 518                         if (s->debug)
 519                                 {
 520                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 521                                         goto end;
 522                                 }
 523
 524                         if ((cb != NULL) && (s->state != state))
 525                                 {
 526                                 new_state=s->state;
 527                                 s->state=state;
 528                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 529                                 s->state=new_state;
 530                                 }
 531                         }
 532                 skip=0;
 533                 }
 534 end:
 535         s->in_handshake--;
 536         if (buf != NULL)
 537                 BUF_MEM_free(buf);
 538         if (cb != NULL)
 539                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 540         return(ret);
 541         }
 542
 543 int dtls1_client_hello(SSL *s)
 544         {
 545         unsigned char *buf;
 546         unsigned char *p,*d;
 547         unsigned int i,j;
 548         unsigned long Time,l;
 549         SSL_COMP *comp;
 550
 551         buf=(unsigned char *)s->init_buf->data;
 552         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 553                 {
 554                 if ((s->session == NULL) ||
 555                         (s->session->ssl_version != s->version) ||
 556                         (s->session->not_resumable))
 557                         {
 558                         if (!ssl_get_new_session(s,0))
 559                                 goto err;
 560                         }
 561                 /* else use the pre-loaded session */
 562
 563                 p=s->s3->client_random;
 564
 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,sizeof(s->s3->client_random)-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                 l=(p-d);
 637                 d=buf;
 638
 639                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 640
 641                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 642                 /* number of bytes to write */
 643                 s->init_num=p-buf;
 644                 s->init_off=0;
 645
 646                 /* buffer the message to handle re-xmits */
 647                 dtls1_buffer_message(s, 0);
 648                 }
 649
 650         /* SSL3_ST_CW_CLNT_HELLO_B */
 651         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 652 err:
 653         return(-1);
 654         }
 655
 656 static int dtls1_get_hello_verify(SSL *s)
 657         {
 658         int n, al, ok = 0;
 659         unsigned char *data;
 660         unsigned int cookie_len;
 661
 662         n=s->method->ssl_get_message(s,
 663                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 664                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 665                 -1,
 666                 s->max_cert_list,
 667                 &ok);
 668
 669         if (!ok) return((int)n);
 670
 671         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 672                 {
 673                 s->d1->send_cookie = 0;
 674                 s->s3->tmp.reuse_message=1;
 675                 return(1);
 676                 }
 677
 678         data = (unsigned char *)s->init_msg;
 679
 680         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 681                 {
 682                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 683                 s->version=(s->version&0xff00)|data[1];
 684                 al = SSL_AD_PROTOCOL_VERSION;
 685                 goto f_err;
 686                 }
 687         data+=2;
 688
 689         cookie_len = *(data++);
 690         if ( cookie_len > sizeof(s->d1->cookie))
 691                 {
 692                 al=SSL_AD_ILLEGAL_PARAMETER;
 693                 goto f_err;
 694                 }
 695
 696         memcpy(s->d1->cookie, data, cookie_len);
 697         s->d1->cookie_len = cookie_len;
 698
 699         s->d1->send_cookie = 1;
 700         return 1;
 701
 702 f_err:
 703         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 704         return -1;
 705         }
 706
 707 int dtls1_send_client_key_exchange(SSL *s)
 708         {
 709         unsigned char *p,*d;
 710         int n;
 711         unsigned long alg_k;
 712 #ifndef OPENSSL_NO_RSA
 713         unsigned char *q;
 714         EVP_PKEY *pkey=NULL;
 715 #endif
 716 #ifndef OPENSSL_NO_KRB5
 717         KSSL_ERR kssl_err;
 718 #endif /* OPENSSL_NO_KRB5 */
 719
 720         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 721                 {
 722                 d=(unsigned char *)s->init_buf->data;
 723                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 724
 725                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 726
 727                 /* Fool emacs indentation */
 728                 if (0) {}
 729 #ifndef OPENSSL_NO_RSA
 730                 else if (alg_k & SSL_kRSA)
 731                         {
 732                         RSA *rsa;
 733                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 734
 735                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 736                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 737                         else
 738                                 {
 739                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 740                                 if ((pkey == NULL) ||
 741                                         (pkey->type != EVP_PKEY_RSA) ||
 742                                         (pkey->pkey.rsa == NULL))
 743                                         {
 744                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 745                                         goto err;
 746                                         }
 747                                 rsa=pkey->pkey.rsa;
 748                                 EVP_PKEY_free(pkey);
 749                                 }
 750
 751                         tmp_buf[0]=s->client_version>>8;
 752                         tmp_buf[1]=s->client_version&0xff;
 753                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
 754                                         goto err;
 755
 756                         s->session->master_key_length=sizeof tmp_buf;
 757
 758                         q=p;
 759                         /* Fix buf for TLS and [incidentally] DTLS */
 760                         if (s->version > SSL3_VERSION)
 761                                 p+=2;
 762                         n=RSA_public_encrypt(sizeof tmp_buf,
 763                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
 764 #ifdef PKCS1_CHECK
 765                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
 766                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
 767 #endif
 768                         if (n <= 0)
 769                                 {
 770                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
 771                                 goto err;
 772                                 }
 773
 774                         /* Fix buf for TLS and [incidentally] DTLS */
 775                         if (s->version > SSL3_VERSION)
 776                                 {
 777                                 s2n(n,q);
 778                                 n+=2;
 779                                 }
 780
 781                         s->session->master_key_length=
 782                                 s->method->ssl3_enc->generate_master_secret(s,
 783                                         s->session->master_key,
 784                                         tmp_buf,sizeof tmp_buf);
 785                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
 786                         }
 787 #endif
 788 #ifndef OPENSSL_NO_KRB5
 789                 else if (alg_k & SSL_kKRB5)
 790                         {
 791                         krb5_error_code krb5rc;
 792                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
 793                         /*  krb5_data   krb5_ap_req;  */
 794                         krb5_data       *enc_ticket;
 795                         krb5_data       authenticator, *authp = NULL;
 796                         EVP_CIPHER_CTX  ciph_ctx;
 797                         const EVP_CIPHER *enc = NULL;
 798                         unsigned char   iv[EVP_MAX_IV_LENGTH];
 799                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 800                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
 801                                                 + EVP_MAX_IV_LENGTH];
 802                         int             padl, outl = sizeof(epms);
 803
 804                         EVP_CIPHER_CTX_init(&ciph_ctx);
 805
 806 #ifdef KSSL_DEBUG
 807                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
 808                                 alg_k, SSL_kKRB5);
 809 #endif  /* KSSL_DEBUG */
 810
 811                         authp = NULL;
 812 #ifdef KRB5SENDAUTH
 813                         if (KRB5SENDAUTH)  authp = &authenticator;
 814 #endif  /* KRB5SENDAUTH */
 815
 816                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
 817                                 &kssl_err);
 818                         enc = kssl_map_enc(kssl_ctx->enctype);
 819                         if (enc == NULL)
 820                             goto err;
 821 #ifdef KSSL_DEBUG
 822                         {
 823                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
 824                         if (krb5rc && kssl_err.text)
 825                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
 826                         }
 827 #endif  /* KSSL_DEBUG */
 828
 829                         if (krb5rc)
 830                                 {
 831                                 ssl3_send_alert(s,SSL3_AL_FATAL,
 832                                                 SSL_AD_HANDSHAKE_FAILURE);
 833                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
 834                                                 kssl_err.reason);
 835                                 goto err;
 836                                 }
 837
 838                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
 839                         **  in place of RFC 2712 KerberosWrapper, as in:
 840                         **
 841                         **  Send ticket (copy to *p, set n = length)
 842                         **  n = krb5_ap_req.length;
 843                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
 844                         **  if (krb5_ap_req.data)
 845                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
 846                         **
 847                         **  Now using real RFC 2712 KerberosWrapper
 848                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
 849                         **  Note: 2712 "opaque" types are here replaced
 850                         **  with a 2-byte length followed by the value.
 851                         **  Example:
 852                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
 853                         **  Where "xx xx" = length bytes.  Shown here with
 854                         **  optional authenticator omitted.
 855                         */
 856
 857                         /*  KerberosWrapper.Ticket              */
 858                         s2n(enc_ticket->length,p);
 859                         memcpy(p, enc_ticket->data, enc_ticket->length);
 860                         p+= enc_ticket->length;
 861                         n = enc_ticket->length + 2;
 862
 863                         /*  KerberosWrapper.Authenticator       */
 864                         if (authp  &&  authp->length)
 865                                 {
 866                                 s2n(authp->length,p);
 867                                 memcpy(p, authp->data, authp->length);
 868                                 p+= authp->length;
 869                                 n+= authp->length + 2;
 870
 871                                 free(authp->data);
 872                                 authp->data = NULL;
 873                                 authp->length = 0;
 874                                 }
 875                         else
 876                                 {
 877                                 s2n(0,p);/*  null authenticator length  */
 878                                 n+=2;
 879                                 }
 880
 881                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
 882                             goto err;
 883
 884                         /*  20010420 VRS.  Tried it this way; failed.
 885                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
 886                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
 887                         **                              kssl_ctx->length);
 888                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
 889                         */
 890
 891                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
 892                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
 893                                 kssl_ctx->key,iv);
 894                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
 895                                 sizeof tmp_buf);
 896                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
 897                         outl += padl;
 898                         if (outl > (int)sizeof epms)
 899                                 {
 900                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 901                                 goto err;
 902                                 }
 903                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
 904
 905                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
 906                         s2n(outl,p);
 907                         memcpy(p, epms, outl);
 908                         p+=outl;
 909                         n+=outl + 2;
 910
 911                         s->session->master_key_length=
 912                                 s->method->ssl3_enc->generate_master_secret(s,
 913                                         s->session->master_key,
 914                                         tmp_buf, sizeof tmp_buf);
 915
 916                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
 917                         OPENSSL_cleanse(epms, outl);
 918                         }
 919 #endif
 920 #ifndef OPENSSL_NO_DH
 921                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 922                         {
 923                         DH *dh_srvr,*dh_clnt;
 924
 925                         if (s->session->sess_cert->peer_dh_tmp != NULL)
 926                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
 927                         else
 928                                 {
 929                                 /* we get them from the cert */
 930                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 931                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
 932                                 goto err;
 933                                 }
 934
 935                         /* generate a new random key */
 936                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
 937                                 {
 938                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 939                                 goto err;
 940                                 }
 941                         if (!DH_generate_key(dh_clnt))
 942                                 {
 943                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 944                                 goto err;
 945                                 }
 946
 947                         /* use the 'p' output buffer for the DH key, but
 948                          * make sure to clear it out afterwards */
 949
 950                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
 951
 952                         if (n <= 0)
 953                                 {
 954                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
 955                                 goto err;
 956                                 }
 957
 958                         /* generate master key from the result */
 959                         s->session->master_key_length=
 960                                 s->method->ssl3_enc->generate_master_secret(s,
 961                                         s->session->master_key,p,n);
 962                         /* clean up */
 963                         memset(p,0,n);
 964
 965                         /* send off the data */
 966                         n=BN_num_bytes(dh_clnt->pub_key);
 967                         s2n(n,p);
 968                         BN_bn2bin(dh_clnt->pub_key,p);
 969                         n+=2;
 970
 971                         DH_free(dh_clnt);
 972
 973                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
 974                         }
 975 #endif
 976                 else
 977                         {
 978                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 979                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 980                         goto err;
 981                         }
 982
 983                 d = dtls1_set_message_header(s, d,
 984                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
 985                 /*
 986                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
 987                  l2n3(n,d);
 988                  l2n(s->d1->handshake_write_seq,d);
 989                  s->d1->handshake_write_seq++;
 990                 */
 991
 992                 s->state=SSL3_ST_CW_KEY_EXCH_B;
 993                 /* number of bytes to write */
 994                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 995                 s->init_off=0;
 996
 997                 /* buffer the message to handle re-xmits */
 998                 dtls1_buffer_message(s, 0);
 999                 }
1000
1001         /* SSL3_ST_CW_KEY_EXCH_B */
1002         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1003 err:
1004         return(-1);
1005         }
1006
1007 int dtls1_send_client_verify(SSL *s)
1008         {
1009         unsigned char *p,*d;
1010         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1011         EVP_PKEY *pkey;
1012 #ifndef OPENSSL_NO_RSA
1013         unsigned u=0;
1014 #endif
1015         unsigned long n;
1016 #ifndef OPENSSL_NO_DSA
1017         int j;
1018 #endif
1019
1020         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1021                 {
1022                 d=(unsigned char *)s->init_buf->data;
1023                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1024                 pkey=s->cert->key->privatekey;
1025
1026                 s->method->ssl3_enc->cert_verify_mac(s,
1027                 NID_sha1,
1028                         &(data[MD5_DIGEST_LENGTH]));
1029
1030 #ifndef OPENSSL_NO_RSA
1031                 if (pkey->type == EVP_PKEY_RSA)
1032                         {
1033                         s->method->ssl3_enc->cert_verify_mac(s,
1034                                 NID_md5,
1035                                 &(data[0]));
1036                         if (RSA_sign(NID_md5_sha1, data,
1037                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1038                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1039                                 {
1040                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1041                                 goto err;
1042                                 }
1043                         s2n(u,p);
1044                         n=u+2;
1045                         }
1046                 else
1047 #endif
1048 #ifndef OPENSSL_NO_DSA
1049                         if (pkey->type == EVP_PKEY_DSA)
1050                         {
1051                         if (!DSA_sign(pkey->save_type,
1052                                 &(data[MD5_DIGEST_LENGTH]),
1053                                 SHA_DIGEST_LENGTH,&(p[2]),
1054                                 (unsigned int *)&j,pkey->pkey.dsa))
1055                                 {
1056                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1057                                 goto err;
1058                                 }
1059                         s2n(j,p);
1060                         n=j+2;
1061                         }
1062                 else
1063 #endif
1064                         {
1065                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1066                         goto err;
1067                         }
1068
1069                 d = dtls1_set_message_header(s, d,
1070                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1071
1072                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1073                 s->init_off=0;
1074
1075                 /* buffer the message to handle re-xmits */
1076                 dtls1_buffer_message(s, 0);
1077
1078                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1079                 }
1080
1081         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1082         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1083 err:
1084         return(-1);
1085         }
1086
1087 int dtls1_send_client_certificate(SSL *s)
1088         {
1089         X509 *x509=NULL;
1090         EVP_PKEY *pkey=NULL;
1091         int i;
1092         unsigned long l;
1093
1094         if (s->state == SSL3_ST_CW_CERT_A)
1095                 {
1096                 if ((s->cert == NULL) ||
1097                         (s->cert->key->x509 == NULL) ||
1098                         (s->cert->key->privatekey == NULL))
1099                         s->state=SSL3_ST_CW_CERT_B;
1100                 else
1101                         s->state=SSL3_ST_CW_CERT_C;
1102                 }
1103
1104         /* We need to get a client cert */
1105         if (s->state == SSL3_ST_CW_CERT_B)
1106                 {
1107                 /* If we get an error, we need to
1108                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1109                  * We then get retied later */
1110                 i=0;
1111                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1112                 if (i < 0)
1113                         {
1114                         s->rwstate=SSL_X509_LOOKUP;
1115                         return(-1);
1116                         }
1117                 s->rwstate=SSL_NOTHING;
1118                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1119                         {
1120                         s->state=SSL3_ST_CW_CERT_B;
1121                         if (    !SSL_use_certificate(s,x509) ||
1122                                 !SSL_use_PrivateKey(s,pkey))
1123                                 i=0;
1124                         }
1125                 else if (i == 1)
1126                         {
1127                         i=0;
1128                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1129                         }
1130
1131                 if (x509 != NULL) X509_free(x509);
1132                 if (pkey != NULL) EVP_PKEY_free(pkey);
1133                 if (i == 0)
1134                         {
1135                         if (s->version == SSL3_VERSION)
1136                                 {
1137                                 s->s3->tmp.cert_req=0;
1138                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1139                                 return(1);
1140                                 }
1141                         else
1142                                 {
1143                                 s->s3->tmp.cert_req=2;
1144                                 }
1145                         }
1146
1147                 /* Ok, we have a cert */
1148                 s->state=SSL3_ST_CW_CERT_C;
1149                 }
1150
1151         if (s->state == SSL3_ST_CW_CERT_C)
1152                 {
1153                 s->state=SSL3_ST_CW_CERT_D;
1154                 l=dtls1_output_cert_chain(s,
1155                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1156                 s->init_num=(int)l;
1157                 s->init_off=0;
1158
1159                 /* set header called by dtls1_output_cert_chain() */
1160
1161                 /* buffer the message to handle re-xmits */
1162                 dtls1_buffer_message(s, 0);
1163                 }
1164         /* SSL3_ST_CW_CERT_D */
1165         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1166         }
1167
1168