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         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 154 #ifndef OPENSSL_NO_SCTP
 155         unsigned char sctpauthkey[64];
 156         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 157 #endif
 158
 159         RAND_add(&Time,sizeof(Time),0);
 160         ERR_clear_error();
 161         clear_sys_error();
 162
 163         if (s->info_callback != NULL)
 164                 cb=s->info_callback;
 165         else if (s->ctx->info_callback != NULL)
 166                 cb=s->ctx->info_callback;
 167
 168         s->in_handshake++;
 169         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 170
 171 #ifndef OPENSSL_NO_SCTP
 172         /* Notify SCTP BIO socket to enter handshake
 173          * mode and prevent stream identifier other
 174          * than 0. Will be ignored if no SCTP is used.
 175          */
 176         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 177 #endif
 178
 179 #ifndef OPENSSL_NO_HEARTBEATS
 180         /* If we're awaiting a HeartbeatResponse, pretend we
 181          * already got and don't await it anymore, because
 182          * Heartbeats don't make sense during handshakes anyway.
 183          */
 184         if (s->tlsext_hb_pending)
 185                 {
 186                 dtls1_stop_timer(s);
 187                 s->tlsext_hb_pending = 0;
 188                 s->tlsext_hb_seq++;
 189                 }
 190 #endif
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch(s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->renegotiate=1;
 200                         s->state=SSL_ST_CONNECT;
 201                         s->ctx->stats.sess_connect_renegotiate++;
 202                         /* break */
 203                 case SSL_ST_BEFORE:
 204                 case SSL_ST_CONNECT:
 205                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 206                 case SSL_ST_OK|SSL_ST_CONNECT:
 207
 208                         s->server=0;
 209                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 210
 211                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
 212                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
 213                                 {
 214                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
 215                                 ret = -1;
 216                                 goto end;
 217                                 }
 218
 219                         /* s->version=SSL3_VERSION; */
 220                         s->type=SSL_ST_CONNECT;
 221
 222                         if (s->init_buf == NULL)
 223                                 {
 224                                 if ((buf=BUF_MEM_new()) == NULL)
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 230                                         {
 231                                         ret= -1;
 232                                         goto end;
 233                                         }
 234                                 s->init_buf=buf;
 235                                 buf=NULL;
 236                                 }
 237
 238                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 239
 240                         /* setup buffing BIO */
 241                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 242
 243                         /* don't push the buffering BIO quite yet */
 244
 245                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 246                         s->ctx->stats.sess_connect++;
 247                         s->init_num=0;
 248                         /* mark client_random uninitialized */
 249                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
 250                         s->d1->send_cookie = 0;
 251                         s->hit = 0;
 252                         break;
 253
 254 #ifndef OPENSSL_NO_SCTP
 255                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 256
 257                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 258                         {
 259                                 s->s3->in_read_app_data=2;
 260                                 s->rwstate=SSL_READING;
 261                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 262                                 BIO_set_retry_read(SSL_get_rbio(s));
 263                                 ret = -1;
 264                                 goto end;
 265                         }
 266
 267                         s->state=s->s3->tmp.next_state;
 268                         break;
 269
 270                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 271                         /* read app data until dry event */
 272
 273                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 274                         if (ret < 0) goto end;
 275
 276                         if (ret == 0)
 277                         {
 278                                 s->s3->in_read_app_data=2;
 279                                 s->rwstate=SSL_READING;
 280                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 281                                 BIO_set_retry_read(SSL_get_rbio(s));
 282                                 ret = -1;
 283                                 goto end;
 284                         }
 285
 286                         s->state=s->d1->next_state;
 287                         break;
 288 #endif
 289
 290                 case SSL3_ST_CW_CLNT_HELLO_A:
 291                 case SSL3_ST_CW_CLNT_HELLO_B:
 292
 293                         s->shutdown=0;
 294
 295                         /* every DTLS ClientHello resets Finished MAC */
 296                         ssl3_init_finished_mac(s);
 297
 298                         dtls1_start_timer(s);
 299                         ret=dtls1_client_hello(s);
 300                         if (ret <= 0) goto end;
 301
 302                         if ( s->d1->send_cookie)
 303                                 {
 304                                 s->state=SSL3_ST_CW_FLUSH;
 305                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 306                                 }
 307                         else
 308                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 309
 310                         s->init_num=0;
 311
 312 #ifndef OPENSSL_NO_SCTP
 313                         /* Disable buffering for SCTP */
 314                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 315                                 {
 316 #endif
 317                                 /* turn on buffering for the next lot of output */
 318                                 if (s->bbio != s->wbio)
 319                                         s->wbio=BIO_push(s->bbio,s->wbio);
 320 #ifndef OPENSSL_NO_SCTP
 321                                 }
 322 #endif
 323
 324                         break;
 325
 326                 case SSL3_ST_CR_SRVR_HELLO_A:
 327                 case SSL3_ST_CR_SRVR_HELLO_B:
 328                         ret=ssl3_get_server_hello(s);
 329                         if (ret <= 0) goto end;
 330                         else
 331                                 {
 332                                 if (s->hit)
 333                                         {
 334 #ifndef OPENSSL_NO_SCTP
 335                                         /* Add new shared key for SCTP-Auth,
 336                                          * will be ignored if no SCTP used.
 337                                          */
 338                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 339                                                  DTLS1_SCTP_AUTH_LABEL);
 340
 341                                         SSL_export_keying_material(s, sctpauthkey,
 342                                                                    sizeof(sctpauthkey), labelbuffer,
 343                                                                    sizeof(labelbuffer), NULL, 0, 0);
 344
 345                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 346                                                          sizeof(sctpauthkey), sctpauthkey);
 347 #endif
 348
 349                                         s->state=SSL3_ST_CR_FINISHED_A;
 350                                         }
 351                                 else
 352                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 353                                 }
 354                         s->init_num=0;
 355                         break;
 356
 357                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 358                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 359
 360                         ret = dtls1_get_hello_verify(s);
 361                         if ( ret <= 0)
 362                                 goto end;
 363                         dtls1_stop_timer(s);
 364                         if ( s->d1->send_cookie) /* start again, with a cookie */
 365                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 366                         else
 367                                 s->state = SSL3_ST_CR_CERT_A;
 368                         s->init_num = 0;
 369                         break;
 370
 371                 case SSL3_ST_CR_CERT_A:
 372                 case SSL3_ST_CR_CERT_B:
 373                         /* Check if it is anon DH or PSK */
 374                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 375                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 376                                 {
 377                                 ret=ssl3_get_server_certificate(s);
 378                                 if (ret <= 0) goto end;
 379 #ifndef OPENSSL_NO_TLSEXT
 380                                 if (s->tlsext_status_expected)
 381                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 382                                 else
 383                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 384                                 }
 385                         else
 386                                 {
 387                                 skip = 1;
 388                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 389                                 }
 390 #else
 391                                 }
 392                         else
 393                                 skip=1;
 394
 395                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 396 #endif
 397                         s->init_num=0;
 398                         break;
 399
 400                 case SSL3_ST_CR_KEY_EXCH_A:
 401                 case SSL3_ST_CR_KEY_EXCH_B:
 402                         ret=ssl3_get_key_exchange(s);
 403                         if (ret <= 0) goto end;
 404                         s->state=SSL3_ST_CR_CERT_REQ_A;
 405                         s->init_num=0;
 406
 407                         /* at this point we check that we have the
 408                          * required stuff from the server */
 409                         if (!ssl3_check_cert_and_algorithm(s))
 410                                 {
 411                                 ret= -1;
 412                                 goto end;
 413                                 }
 414                         break;
 415
 416                 case SSL3_ST_CR_CERT_REQ_A:
 417                 case SSL3_ST_CR_CERT_REQ_B:
 418                         ret=ssl3_get_certificate_request(s);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 421                         s->init_num=0;
 422                         break;
 423
 424                 case SSL3_ST_CR_SRVR_DONE_A:
 425                 case SSL3_ST_CR_SRVR_DONE_B:
 426                         ret=ssl3_get_server_done(s);
 427                         if (ret <= 0) goto end;
 428                         dtls1_stop_timer(s);
 429                         if (s->s3->tmp.cert_req)
 430                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 431                         else
 432                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 433                         s->init_num=0;
 434
 435 #ifndef OPENSSL_NO_SCTP
 436                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 437                             state == SSL_ST_RENEGOTIATE)
 438                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 439                         else
 440 #endif
 441                         s->state=s->s3->tmp.next_state;
 442                         break;
 443
 444                 case SSL3_ST_CW_CERT_A:
 445                 case SSL3_ST_CW_CERT_B:
 446                 case SSL3_ST_CW_CERT_C:
 447                 case SSL3_ST_CW_CERT_D:
 448                         dtls1_start_timer(s);
 449                         ret=dtls1_send_client_certificate(s);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 452                         s->init_num=0;
 453                         break;
 454
 455                 case SSL3_ST_CW_KEY_EXCH_A:
 456                 case SSL3_ST_CW_KEY_EXCH_B:
 457                         dtls1_start_timer(s);
 458                         ret=dtls1_send_client_key_exchange(s);
 459                         if (ret <= 0) goto end;
 460
 461 #ifndef OPENSSL_NO_SCTP
 462                         /* Add new shared key for SCTP-Auth,
 463                          * will be ignored if no SCTP used.
 464                          */
 465                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 466                                  DTLS1_SCTP_AUTH_LABEL);
 467
 468                         SSL_export_keying_material(s, sctpauthkey,
 469                                                    sizeof(sctpauthkey), labelbuffer,
 470                                                    sizeof(labelbuffer), NULL, 0, 0);
 471
 472                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 473                                          sizeof(sctpauthkey), sctpauthkey);
 474 #endif
 475
 476                         /* EAY EAY EAY need to check for DH fix cert
 477                          * sent back */
 478                         /* For TLS, cert_req is set to 2, so a cert chain
 479                          * of nothing is sent, but no verify packet is sent */
 480                         if (s->s3->tmp.cert_req == 1)
 481                                 {
 482                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 483                                 }
 484                         else
 485                                 {
 486 #ifndef OPENSSL_NO_SCTP
 487                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 488                                         {
 489                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 490                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 491                                         }
 492                                 else
 493 #endif
 494                                         s->state=SSL3_ST_CW_CHANGE_A;
 495                                 s->s3->change_cipher_spec=0;
 496                                 }
 497
 498                         s->init_num=0;
 499                         break;
 500
 501                 case SSL3_ST_CW_CERT_VRFY_A:
 502                 case SSL3_ST_CW_CERT_VRFY_B:
 503                         dtls1_start_timer(s);
 504                         ret=dtls1_send_client_verify(s);
 505                         if (ret <= 0) goto end;
 506 #ifndef OPENSSL_NO_SCTP
 507                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 508                         {
 509                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 510                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 511                         }
 512                         else
 513 #endif
 514                                 s->state=SSL3_ST_CW_CHANGE_A;
 515                         s->init_num=0;
 516                         s->s3->change_cipher_spec=0;
 517                         break;
 518
 519                 case SSL3_ST_CW_CHANGE_A:
 520                 case SSL3_ST_CW_CHANGE_B:
 521                         if (!s->hit)
 522                                 dtls1_start_timer(s);
 523                         ret=dtls1_send_change_cipher_spec(s,
 524                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 525                         if (ret <= 0) goto end;
 526
 527                         s->state=SSL3_ST_CW_FINISHED_A;
 528                         s->init_num=0;
 529
 530                         s->session->cipher=s->s3->tmp.new_cipher;
 531 #ifdef OPENSSL_NO_COMP
 532                         s->session->compress_meth=0;
 533 #else
 534                         if (s->s3->tmp.new_compression == NULL)
 535                                 s->session->compress_meth=0;
 536                         else
 537                                 s->session->compress_meth=
 538                                         s->s3->tmp.new_compression->id;
 539 #endif
 540                         if (!s->method->ssl3_enc->setup_key_block(s))
 541                                 {
 542                                 ret= -1;
 543                                 goto end;
 544                                 }
 545
 546                         if (!s->method->ssl3_enc->change_cipher_state(s,
 547                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 548                                 {
 549                                 ret= -1;
 550                                 goto end;
 551                                 }
 552
 553 #ifndef OPENSSL_NO_SCTP
 554                                 if (s->hit)
 555                                         {
 556                                         /* Change to new shared key of SCTP-Auth,
 557                                          * will be ignored if no SCTP used.
 558                                          */
 559                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 560                                         }
 561 #endif
 562
 563                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 564                         break;
 565
 566                 case SSL3_ST_CW_FINISHED_A:
 567                 case SSL3_ST_CW_FINISHED_B:
 568                         if (!s->hit)
 569                                 dtls1_start_timer(s);
 570                         ret=dtls1_send_finished(s,
 571                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 572                                 s->method->ssl3_enc->client_finished_label,
 573                                 s->method->ssl3_enc->client_finished_label_len);
 574                         if (ret <= 0) goto end;
 575                         s->state=SSL3_ST_CW_FLUSH;
 576
 577                         /* clear flags */
 578                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 579                         if (s->hit)
 580                                 {
 581                                 s->s3->tmp.next_state=SSL_ST_OK;
 582 #ifndef OPENSSL_NO_SCTP
 583                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 584                                         {
 585                                                 s->d1->next_state = s->s3->tmp.next_state;
 586                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 587                                         }
 588 #endif
 589                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 590                                         {
 591                                         s->state=SSL_ST_OK;
 592 #ifndef OPENSSL_NO_SCTP
 593                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 594                                                 {
 595                                                         s->d1->next_state = SSL_ST_OK;
 596                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 597                                                 }
 598 #endif
 599                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 600                                         s->s3->delay_buf_pop_ret=0;
 601                                         }
 602                                 }
 603                         else
 604                                 {
 605 #ifndef OPENSSL_NO_SCTP
 606                                 /* Change to new shared key of SCTP-Auth,
 607                                  * will be ignored if no SCTP used.
 608                                  */
 609                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 610 #endif
 611
 612 #ifndef OPENSSL_NO_TLSEXT
 613                                 /* Allow NewSessionTicket if ticket expected */
 614                                 if (s->tlsext_ticket_expected)
 615                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 616                                 else
 617 #endif
 618
 619                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 620                                 }
 621                         s->init_num=0;
 622                         break;
 623
 624 #ifndef OPENSSL_NO_TLSEXT
 625                 case SSL3_ST_CR_SESSION_TICKET_A:
 626                 case SSL3_ST_CR_SESSION_TICKET_B:
 627                         ret=ssl3_get_new_session_ticket(s);
 628                         if (ret <= 0) goto end;
 629                         s->state=SSL3_ST_CR_FINISHED_A;
 630                         s->init_num=0;
 631                 break;
 632
 633                 case SSL3_ST_CR_CERT_STATUS_A:
 634                 case SSL3_ST_CR_CERT_STATUS_B:
 635                         ret=ssl3_get_cert_status(s);
 636                         if (ret <= 0) goto end;
 637                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 638                         s->init_num=0;
 639                 break;
 640 #endif
 641
 642                 case SSL3_ST_CR_FINISHED_A:
 643                 case SSL3_ST_CR_FINISHED_B:
 644                         s->d1->change_cipher_spec_ok = 1;
 645                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 646                                 SSL3_ST_CR_FINISHED_B);
 647                         if (ret <= 0) goto end;
 648                         dtls1_stop_timer(s);
 649
 650                         if (s->hit)
 651                                 s->state=SSL3_ST_CW_CHANGE_A;
 652                         else
 653                                 s->state=SSL_ST_OK;
 654
 655 #ifndef OPENSSL_NO_SCTP
 656                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 657                                 state == SSL_ST_RENEGOTIATE)
 658                                 {
 659                                 s->d1->next_state=s->state;
 660                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 661                                 }
 662 #endif
 663
 664                         s->init_num=0;
 665                         break;
 666
 667                 case SSL3_ST_CW_FLUSH:
 668                         s->rwstate=SSL_WRITING;
 669                         if (BIO_flush(s->wbio) <= 0)
 670                                 {
 671                                 /* If the write error was fatal, stop trying */
 672                                 if (!BIO_should_retry(s->wbio))
 673                                         {
 674                                         s->rwstate=SSL_NOTHING;
 675                                         s->state=s->s3->tmp.next_state;
 676                                         }
 677
 678                                 ret= -1;
 679                                 goto end;
 680                                 }
 681                         s->rwstate=SSL_NOTHING;
 682                         s->state=s->s3->tmp.next_state;
 683                         break;
 684
 685                 case SSL_ST_OK:
 686                         /* clean a few things up */
 687                         ssl3_cleanup_key_block(s);
 688
 689 #if 0
 690                         if (s->init_buf != NULL)
 691                                 {
 692                                 BUF_MEM_free(s->init_buf);
 693                                 s->init_buf=NULL;
 694                                 }
 695 #endif
 696
 697                         /* If we are not 'joining' the last two packets,
 698                          * remove the buffering now */
 699                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 700                                 ssl_free_wbio_buffer(s);
 701                         /* else do it later in ssl3_write */
 702
 703                         s->init_num=0;
 704                         s->renegotiate=0;
 705                         s->new_session=0;
 706
 707                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 708                         if (s->hit) s->ctx->stats.sess_hit++;
 709
 710                         ret=1;
 711                         /* s->server=0; */
 712                         s->handshake_func=dtls1_connect;
 713                         s->ctx->stats.sess_connect_good++;
 714
 715                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 716
 717                         /* done with handshaking */
 718                         s->d1->handshake_read_seq  = 0;
 719                         s->d1->next_handshake_write_seq = 0;
 720                         goto end;
 721                         /* break; */
 722
 723                 default:
 724                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 725                         ret= -1;
 726                         goto end;
 727                         /* break; */
 728                         }
 729
 730                 /* did we do anything */
 731                 if (!s->s3->tmp.reuse_message && !skip)
 732                         {
 733                         if (s->debug)
 734                                 {
 735                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 736                                         goto end;
 737                                 }
 738
 739                         if ((cb != NULL) && (s->state != state))
 740                                 {
 741                                 new_state=s->state;
 742                                 s->state=state;
 743                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 744                                 s->state=new_state;
 745                                 }
 746                         }
 747                 skip=0;
 748                 }
 749 end:
 750         s->in_handshake--;
 751
 752 #ifndef OPENSSL_NO_SCTP
 753         /* Notify SCTP BIO socket to leave handshake
 754          * mode and allow stream identifier other
 755          * than 0. Will be ignored if no SCTP is used.
 756          */
 757         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 758 #endif
 759
 760         if (buf != NULL)
 761                 BUF_MEM_free(buf);
 762         if (cb != NULL)
 763                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 764         return(ret);
 765         }
 766
 767 int dtls1_client_hello(SSL *s)
 768         {
 769         unsigned char *buf;
 770         unsigned char *p,*d;
 771         unsigned int i,j;
 772         unsigned long l;
 773         SSL_COMP *comp;
 774
 775         buf=(unsigned char *)s->init_buf->data;
 776         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 777                 {
 778                 SSL_SESSION *sess = s->session;
 779                 if ((s->session == NULL) ||
 780                         (s->session->ssl_version != s->version) ||
 781 #ifdef OPENSSL_NO_TLSEXT
 782                         !sess->session_id_length ||
 783 #else
 784                         (!sess->session_id_length && !sess->tlsext_tick) ||
 785 #endif
 786                         (s->session->not_resumable))
 787                         {
 788                         if (!ssl_get_new_session(s,0))
 789                                 goto err;
 790                         }
 791                 /* else use the pre-loaded session */
 792
 793                 p=s->s3->client_random;
 794
 795                 /* if client_random is initialized, reuse it, we are
 796                  * required to use same upon reply to HelloVerify */
 797                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++)
 798                         ;
 799                 if (i==sizeof(s->s3->client_random))
 800                         ssl_fill_hello_random(s, 0, p,
 801                                               sizeof(s->s3->client_random));
 802
 803                 /* Do the message type and length last */
 804                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 805
 806                 *(p++)=s->version>>8;
 807                 *(p++)=s->version&0xff;
 808                 s->client_version=s->version;
 809
 810                 /* Random stuff */
 811                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 812                 p+=SSL3_RANDOM_SIZE;
 813
 814                 /* Session ID */
 815                 if (s->new_session)
 816                         i=0;
 817                 else
 818                         i=s->session->session_id_length;
 819                 *(p++)=i;
 820                 if (i != 0)
 821                         {
 822                         if (i > sizeof s->session->session_id)
 823                                 {
 824                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 825                                 goto err;
 826                                 }
 827                         memcpy(p,s->session->session_id,i);
 828                         p+=i;
 829                         }
 830
 831                 /* cookie stuff */
 832                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 833                         {
 834                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 835                         goto err;
 836                         }
 837                 *(p++) = s->d1->cookie_len;
 838                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 839                 p += s->d1->cookie_len;
 840
 841                 /* Ciphers supported */
 842                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 843                 if (i == 0)
 844                         {
 845                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 846                         goto err;
 847                         }
 848                 s2n(i,p);
 849                 p+=i;
 850
 851                 /* COMPRESSION */
 852                 if (s->ctx->comp_methods == NULL)
 853                         j=0;
 854                 else
 855                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 856                 *(p++)=1+j;
 857                 for (i=0; i<j; i++)
 858                         {
 859                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 860                         *(p++)=comp->id;
 861                         }
 862                 *(p++)=0; /* Add the NULL method */
 863
 864 #ifndef OPENSSL_NO_TLSEXT
 865                 /* TLS extensions*/
 866                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 867                         {
 868                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 869                         goto err;
 870                         }
 871                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 872                         {
 873                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 874                         goto err;
 875                         }
 876 #endif
 877
 878                 l=(p-d);
 879                 d=buf;
 880
 881                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 882
 883                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 884                 /* number of bytes to write */
 885                 s->init_num=p-buf;
 886                 s->init_off=0;
 887
 888                 /* buffer the message to handle re-xmits */
 889                 dtls1_buffer_message(s, 0);
 890                 }
 891
 892         /* SSL3_ST_CW_CLNT_HELLO_B */
 893         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 894 err:
 895         return(-1);
 896         }
 897
 898 static int dtls1_get_hello_verify(SSL *s)
 899         {
 900         int n, al, ok = 0;
 901         unsigned char *data;
 902         unsigned int cookie_len;
 903
 904         n=s->method->ssl_get_message(s,
 905                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 906                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 907                 -1,
 908                 s->max_cert_list,
 909                 &ok);
 910
 911         if (!ok) return((int)n);
 912
 913         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 914                 {
 915                 s->d1->send_cookie = 0;
 916                 s->s3->tmp.reuse_message=1;
 917                 return(1);
 918                 }
 919
 920         data = (unsigned char *)s->init_msg;
 921
 922         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 923                 {
 924                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 925                 s->version=(s->version&0xff00)|data[1];
 926                 al = SSL_AD_PROTOCOL_VERSION;
 927                 goto f_err;
 928                 }
 929         data+=2;
 930
 931         cookie_len = *(data++);
 932         if ( cookie_len > sizeof(s->d1->cookie))
 933                 {
 934                 al=SSL_AD_ILLEGAL_PARAMETER;
 935                 goto f_err;
 936                 }
 937
 938         memcpy(s->d1->cookie, data, cookie_len);
 939         s->d1->cookie_len = cookie_len;
 940
 941         s->d1->send_cookie = 1;
 942         return 1;
 943
 944 f_err:
 945         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 946         return -1;
 947         }
 948
 949 int dtls1_send_client_key_exchange(SSL *s)
 950         {
 951         unsigned char *p,*d;
 952         int n;
 953         unsigned long alg_k;
 954 #ifndef OPENSSL_NO_RSA
 955         unsigned char *q;
 956         EVP_PKEY *pkey=NULL;
 957 #endif
 958 #ifndef OPENSSL_NO_KRB5
 959         KSSL_ERR kssl_err;
 960 #endif /* OPENSSL_NO_KRB5 */
 961 #ifndef OPENSSL_NO_ECDH
 962         EC_KEY *clnt_ecdh = NULL;
 963         const EC_POINT *srvr_ecpoint = NULL;
 964         EVP_PKEY *srvr_pub_pkey = NULL;
 965         unsigned char *encodedPoint = NULL;
 966         int encoded_pt_len = 0;
 967         BN_CTX * bn_ctx = NULL;
 968 #endif
 969
 970         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 971                 {
 972                 d=(unsigned char *)s->init_buf->data;
 973                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 974
 975                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 976
 977                 /* Fool emacs indentation */
 978                 if (0) {}
 979 #ifndef OPENSSL_NO_RSA
 980                 else if (alg_k & SSL_kRSA)
 981                         {
 982                         RSA *rsa;
 983                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 984
 985                         if (s->session->sess_cert == NULL)
 986                                 {
 987                                 /* We should always have a server certificate with SSL_kRSA. */
 988                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 989                                 goto err;
 990                                 }
 991
 992                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 993                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 994                         else
 995                                 {
 996                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 997                                 if ((pkey == NULL) ||
 998                                         (pkey->type != EVP_PKEY_RSA) ||
 999                                         (pkey->pkey.rsa == NULL))
1000                                         {
1001                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1002                                         goto err;
1003                                         }
1004                                 rsa=pkey->pkey.rsa;
1005                                 EVP_PKEY_free(pkey);
1006                                 }
1007
1008                         tmp_buf[0]=s->client_version>>8;
1009                         tmp_buf[1]=s->client_version&0xff;
1010                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1011                                         goto err;
1012
1013                         s->session->master_key_length=sizeof tmp_buf;
1014
1015                         q=p;
1016                         /* Fix buf for TLS and [incidentally] DTLS */
1017                         if (s->version > SSL3_VERSION)
1018                                 p+=2;
1019                         n=RSA_public_encrypt(sizeof tmp_buf,
1020                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1021 #ifdef PKCS1_CHECK
1022                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1023                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1024 #endif
1025                         if (n <= 0)
1026                                 {
1027                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1028                                 goto err;
1029                                 }
1030
1031                         /* Fix buf for TLS and [incidentally] DTLS */
1032                         if (s->version > SSL3_VERSION)
1033                                 {
1034                                 s2n(n,q);
1035                                 n+=2;
1036                                 }
1037
1038                         s->session->master_key_length=
1039                                 s->method->ssl3_enc->generate_master_secret(s,
1040                                         s->session->master_key,
1041                                         tmp_buf,sizeof tmp_buf);
1042                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1043                         }
1044 #endif
1045 #ifndef OPENSSL_NO_KRB5
1046                 else if (alg_k & SSL_kKRB5)
1047                         {
1048                         krb5_error_code krb5rc;
1049                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1050                         /*  krb5_data   krb5_ap_req;  */
1051                         krb5_data       *enc_ticket;
1052                         krb5_data       authenticator, *authp = NULL;
1053                         EVP_CIPHER_CTX  ciph_ctx;
1054                         const EVP_CIPHER *enc = NULL;
1055                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1056                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1057                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1058                                                 + EVP_MAX_IV_LENGTH];
1059                         int             padl, outl = sizeof(epms);
1060
1061                         EVP_CIPHER_CTX_init(&ciph_ctx);
1062
1063 #ifdef KSSL_DEBUG
1064                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1065                                 alg_k, SSL_kKRB5);
1066 #endif  /* KSSL_DEBUG */
1067
1068                         authp = NULL;
1069 #ifdef KRB5SENDAUTH
1070                         if (KRB5SENDAUTH)  authp = &authenticator;
1071 #endif  /* KRB5SENDAUTH */
1072
1073                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1074                                 &kssl_err);
1075                         enc = kssl_map_enc(kssl_ctx->enctype);
1076                         if (enc == NULL)
1077                             goto err;
1078 #ifdef KSSL_DEBUG
1079                         {
1080                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1081                         if (krb5rc && kssl_err.text)
1082                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1083                         }
1084 #endif  /* KSSL_DEBUG */
1085
1086                         if (krb5rc)
1087                                 {
1088                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1089                                                 SSL_AD_HANDSHAKE_FAILURE);
1090                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1091                                                 kssl_err.reason);
1092                                 goto err;
1093                                 }
1094
1095                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1096                         **  in place of RFC 2712 KerberosWrapper, as in:
1097                         **
1098                         **  Send ticket (copy to *p, set n = length)
1099                         **  n = krb5_ap_req.length;
1100                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1101                         **  if (krb5_ap_req.data)
1102                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1103                         **
1104                         **  Now using real RFC 2712 KerberosWrapper
1105                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1106                         **  Note: 2712 "opaque" types are here replaced
1107                         **  with a 2-byte length followed by the value.
1108                         **  Example:
1109                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1110                         **  Where "xx xx" = length bytes.  Shown here with
1111                         **  optional authenticator omitted.
1112                         */
1113
1114                         /*  KerberosWrapper.Ticket              */
1115                         s2n(enc_ticket->length,p);
1116                         memcpy(p, enc_ticket->data, enc_ticket->length);
1117                         p+= enc_ticket->length;
1118                         n = enc_ticket->length + 2;
1119
1120                         /*  KerberosWrapper.Authenticator       */
1121                         if (authp  &&  authp->length)
1122                                 {
1123                                 s2n(authp->length,p);
1124                                 memcpy(p, authp->data, authp->length);
1125                                 p+= authp->length;
1126                                 n+= authp->length + 2;
1127
1128                                 free(authp->data);
1129                                 authp->data = NULL;
1130                                 authp->length = 0;
1131                                 }
1132                         else
1133                                 {
1134                                 s2n(0,p);/*  null authenticator length  */
1135                                 n+=2;
1136                                 }
1137
1138                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1139                             goto err;
1140
1141                         /*  20010420 VRS.  Tried it this way; failed.
1142                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1143                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1144                         **                              kssl_ctx->length);
1145                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1146                         */
1147
1148                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1149                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1150                                 kssl_ctx->key,iv);
1151                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1152                                 sizeof tmp_buf);
1153                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1154                         outl += padl;
1155                         if (outl > (int)sizeof epms)
1156                                 {
1157                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1158                                 goto err;
1159                                 }
1160                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1161
1162                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1163                         s2n(outl,p);
1164                         memcpy(p, epms, outl);
1165                         p+=outl;
1166                         n+=outl + 2;
1167
1168                         s->session->master_key_length=
1169                                 s->method->ssl3_enc->generate_master_secret(s,
1170                                         s->session->master_key,
1171                                         tmp_buf, sizeof tmp_buf);
1172
1173                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1174                         OPENSSL_cleanse(epms, outl);
1175                         }
1176 #endif
1177 #ifndef OPENSSL_NO_DH
1178                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1179                         {
1180                         DH *dh_srvr,*dh_clnt;
1181
1182                         if (s->session->sess_cert == NULL)
1183                                 {
1184                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1185                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1186                                 goto err;
1187                                 }
1188
1189                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1190                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1191                         else
1192                                 {
1193                                 /* we get them from the cert */
1194                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1195                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1196                                 goto err;
1197                                 }
1198
1199                         /* generate a new random key */
1200                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1201                                 {
1202                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1203                                 goto err;
1204                                 }
1205                         if (!DH_generate_key(dh_clnt))
1206                                 {
1207                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1208                                 goto err;
1209                                 }
1210
1211                         /* use the 'p' output buffer for the DH key, but
1212                          * make sure to clear it out afterwards */
1213
1214                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1215
1216                         if (n <= 0)
1217                                 {
1218                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1219                                 goto err;
1220                                 }
1221
1222                         /* generate master key from the result */
1223                         s->session->master_key_length=
1224                                 s->method->ssl3_enc->generate_master_secret(s,
1225                                         s->session->master_key,p,n);
1226                         /* clean up */
1227                         memset(p,0,n);
1228
1229                         /* send off the data */
1230                         n=BN_num_bytes(dh_clnt->pub_key);
1231                         s2n(n,p);
1232                         BN_bn2bin(dh_clnt->pub_key,p);
1233                         n+=2;
1234
1235                         DH_free(dh_clnt);
1236
1237                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1238                         }
1239 #endif
1240 #ifndef OPENSSL_NO_ECDH
1241                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1242                         {
1243                         const EC_GROUP *srvr_group = NULL;
1244                         EC_KEY *tkey;
1245                         int ecdh_clnt_cert = 0;
1246                         int field_size = 0;
1247
1248                         if (s->session->sess_cert == NULL)
1249                                 {
1250                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1251                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1252                                 goto err;
1253                                 }
1254
1255                         /* Did we send out the client's
1256                          * ECDH share for use in premaster
1257                          * computation as part of client certificate?
1258                          * If so, set ecdh_clnt_cert to 1.
1259                          */
1260                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1261                                 {
1262                                 /* XXX: For now, we do not support client
1263                                  * authentication using ECDH certificates.
1264                                  * To add such support, one needs to add
1265                                  * code that checks for appropriate
1266                                  * conditions and sets ecdh_clnt_cert to 1.
1267                                  * For example, the cert have an ECC
1268                                  * key on the same curve as the server's
1269                                  * and the key should be authorized for
1270                                  * key agreement.
1271                                  *
1272                                  * One also needs to add code in ssl3_connect
1273                                  * to skip sending the certificate verify
1274                                  * message.
1275                                  *
1276                                  * if ((s->cert->key->privatekey != NULL) &&
1277                                  *     (s->cert->key->privatekey->type ==
1278                                  *      EVP_PKEY_EC) && ...)
1279                                  * ecdh_clnt_cert = 1;
1280                                  */
1281                                 }
1282
1283                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1284                                 {
1285                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1286                                 }
1287                         else
1288                                 {
1289                                 /* Get the Server Public Key from Cert */
1290                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1291                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1292                                 if ((srvr_pub_pkey == NULL) ||
1293                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1294                                     (srvr_pub_pkey->pkey.ec == NULL))
1295                                         {
1296                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1297                                             ERR_R_INTERNAL_ERROR);
1298                                         goto err;
1299                                         }
1300
1301                                 tkey = srvr_pub_pkey->pkey.ec;
1302                                 }
1303
1304                         srvr_group   = EC_KEY_get0_group(tkey);
1305                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1306
1307                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1308                                 {
1309                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1310                                     ERR_R_INTERNAL_ERROR);
1311                                 goto err;
1312                                 }
1313
1314                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1315                                 {
1316                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1317                                 goto err;
1318                                 }
1319
1320                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1321                                 {
1322                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1323                                 goto err;
1324                                 }
1325                         if (ecdh_clnt_cert)
1326                                 {
1327                                 /* Reuse key info from our certificate
1328                                  * We only need our private key to perform
1329                                  * the ECDH computation.
1330                                  */
1331                                 const BIGNUM *priv_key;
1332                                 tkey = s->cert->key->privatekey->pkey.ec;
1333                                 priv_key = EC_KEY_get0_private_key(tkey);
1334                                 if (priv_key == NULL)
1335                                         {
1336                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1337                                         goto err;
1338                                         }
1339                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1340                                         {
1341                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1342                                         goto err;
1343                                         }
1344                                 }
1345                         else
1346                                 {
1347                                 /* Generate a new ECDH key pair */
1348                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1349                                         {
1350                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1351                                         goto err;
1352                                         }
1353                                 }
1354
1355                         /* use the 'p' output buffer for the ECDH key, but
1356                          * make sure to clear it out afterwards
1357                          */
1358
1359                         field_size = EC_GROUP_get_degree(srvr_group);
1360                         if (field_size <= 0)
1361                                 {
1362                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1363                                        ERR_R_ECDH_LIB);
1364                                 goto err;
1365                                 }
1366                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1367                         if (n <= 0)
1368                                 {
1369                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1370                                        ERR_R_ECDH_LIB);
1371                                 goto err;
1372                                 }
1373
1374                         /* generate master key from the result */
1375                         s->session->master_key_length = s->method->ssl3_enc \
1376                             -> generate_master_secret(s,
1377                                 s->session->master_key,
1378                                 p, n);
1379
1380                         memset(p, 0, n); /* clean up */
1381
1382                         if (ecdh_clnt_cert)
1383                                 {
1384                                 /* Send empty client key exch message */
1385                                 n = 0;
1386                                 }
1387                         else
1388                                 {
1389                                 /* First check the size of encoding and
1390                                  * allocate memory accordingly.
1391                                  */
1392                                 encoded_pt_len =
1393                                     EC_POINT_point2oct(srvr_group,
1394                                         EC_KEY_get0_public_key(clnt_ecdh),
1395                                         POINT_CONVERSION_UNCOMPRESSED,
1396                                         NULL, 0, NULL);
1397
1398                                 encodedPoint = (unsigned char *)
1399                                     OPENSSL_malloc(encoded_pt_len *
1400                                         sizeof(unsigned char));
1401                                 bn_ctx = BN_CTX_new();
1402                                 if ((encodedPoint == NULL) ||
1403                                     (bn_ctx == NULL))
1404                                         {
1405                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1406                                         goto err;
1407                                         }
1408
1409                                 /* Encode the public key */
1410                                 n = EC_POINT_point2oct(srvr_group,
1411                                     EC_KEY_get0_public_key(clnt_ecdh),
1412                                     POINT_CONVERSION_UNCOMPRESSED,
1413                                     encodedPoint, encoded_pt_len, bn_ctx);
1414
1415                                 *p = n; /* length of encoded point */
1416                                 /* Encoded point will be copied here */
1417                                 p += 1;
1418                                 /* copy the point */
1419                                 memcpy((unsigned char *)p, encodedPoint, n);
1420                                 /* increment n to account for length field */
1421                                 n += 1;
1422                                 }
1423
1424                         /* Free allocated memory */
1425                         BN_CTX_free(bn_ctx);
1426                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1427                         if (clnt_ecdh != NULL)
1428                                  EC_KEY_free(clnt_ecdh);
1429                         EVP_PKEY_free(srvr_pub_pkey);
1430                         }
1431 #endif /* !OPENSSL_NO_ECDH */
1432
1433 #ifndef OPENSSL_NO_PSK
1434                 else if (alg_k & SSL_kPSK)
1435                         {
1436                         char identity[PSK_MAX_IDENTITY_LEN];
1437                         unsigned char *t = NULL;
1438                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1439                         unsigned int pre_ms_len = 0, psk_len = 0;
1440                         int psk_err = 1;
1441
1442                         n = 0;
1443                         if (s->psk_client_callback == NULL)
1444                                 {
1445                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1446                                         SSL_R_PSK_NO_CLIENT_CB);
1447                                 goto err;
1448                                 }
1449
1450                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1451                                 identity, PSK_MAX_IDENTITY_LEN,
1452                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1453                         if (psk_len > PSK_MAX_PSK_LEN)
1454                                 {
1455                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1456                                         ERR_R_INTERNAL_ERROR);
1457                                 goto psk_err;
1458                                 }
1459                         else if (psk_len == 0)
1460                                 {
1461                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1462                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1463                                 goto psk_err;
1464                                 }
1465
1466                         /* create PSK pre_master_secret */
1467                         pre_ms_len = 2+psk_len+2+psk_len;
1468                         t = psk_or_pre_ms;
1469                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1470                         s2n(psk_len, t);
1471                         memset(t, 0, psk_len);
1472                         t+=psk_len;
1473                         s2n(psk_len, t);
1474
1475                         if (s->session->psk_identity_hint != NULL)
1476                                 OPENSSL_free(s->session->psk_identity_hint);
1477                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1478                         if (s->ctx->psk_identity_hint != NULL &&
1479                                 s->session->psk_identity_hint == NULL)
1480                                 {
1481                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1482                                         ERR_R_MALLOC_FAILURE);
1483                                 goto psk_err;
1484                                 }
1485
1486                         if (s->session->psk_identity != NULL)
1487                                 OPENSSL_free(s->session->psk_identity);
1488                         s->session->psk_identity = BUF_strdup(identity);
1489                         if (s->session->psk_identity == NULL)
1490                                 {
1491                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1492                                         ERR_R_MALLOC_FAILURE);
1493                                 goto psk_err;
1494                                 }
1495
1496                         s->session->master_key_length =
1497                                 s->method->ssl3_enc->generate_master_secret(s,
1498                                         s->session->master_key,
1499                                         psk_or_pre_ms, pre_ms_len);
1500                         n = strlen(identity);
1501                         s2n(n, p);
1502                         memcpy(p, identity, n);
1503                         n+=2;
1504                         psk_err = 0;
1505                 psk_err:
1506                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1507                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1508                         if (psk_err != 0)
1509                                 {
1510                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1511                                 goto err;
1512                                 }
1513                         }
1514 #endif
1515                 else
1516                         {
1517                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1518                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1519                         goto err;
1520                         }
1521
1522                 d = dtls1_set_message_header(s, d,
1523                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1524                 /*
1525                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1526                  l2n3(n,d);
1527                  l2n(s->d1->handshake_write_seq,d);
1528                  s->d1->handshake_write_seq++;
1529                 */
1530
1531                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1532                 /* number of bytes to write */
1533                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1534                 s->init_off=0;
1535
1536                 /* buffer the message to handle re-xmits */
1537                 dtls1_buffer_message(s, 0);
1538                 }
1539
1540         /* SSL3_ST_CW_KEY_EXCH_B */
1541         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1542 err:
1543 #ifndef OPENSSL_NO_ECDH
1544         BN_CTX_free(bn_ctx);
1545         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1546         if (clnt_ecdh != NULL)
1547                 EC_KEY_free(clnt_ecdh);
1548         EVP_PKEY_free(srvr_pub_pkey);
1549 #endif
1550         return(-1);
1551         }
1552
1553 int dtls1_send_client_verify(SSL *s)
1554         {
1555         unsigned char *p,*d;
1556         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1557         EVP_PKEY *pkey;
1558 #ifndef OPENSSL_NO_RSA
1559         unsigned u=0;
1560 #endif
1561         unsigned long n;
1562 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1563         int j;
1564 #endif
1565
1566         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1567                 {
1568                 d=(unsigned char *)s->init_buf->data;
1569                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1570                 pkey=s->cert->key->privatekey;
1571
1572                 s->method->ssl3_enc->cert_verify_mac(s,
1573                 NID_sha1,
1574                         &(data[MD5_DIGEST_LENGTH]));
1575
1576 #ifndef OPENSSL_NO_RSA
1577                 if (pkey->type == EVP_PKEY_RSA)
1578                         {
1579                         s->method->ssl3_enc->cert_verify_mac(s,
1580                                 NID_md5,
1581                                 &(data[0]));
1582                         if (RSA_sign(NID_md5_sha1, data,
1583                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1584                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1585                                 {
1586                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1587                                 goto err;
1588                                 }
1589                         s2n(u,p);
1590                         n=u+2;
1591                         }
1592                 else
1593 #endif
1594 #ifndef OPENSSL_NO_DSA
1595                         if (pkey->type == EVP_PKEY_DSA)
1596                         {
1597                         if (!DSA_sign(pkey->save_type,
1598                                 &(data[MD5_DIGEST_LENGTH]),
1599                                 SHA_DIGEST_LENGTH,&(p[2]),
1600                                 (unsigned int *)&j,pkey->pkey.dsa))
1601                                 {
1602                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1603                                 goto err;
1604                                 }
1605                         s2n(j,p);
1606                         n=j+2;
1607                         }
1608                 else
1609 #endif
1610 #ifndef OPENSSL_NO_ECDSA
1611                         if (pkey->type == EVP_PKEY_EC)
1612                         {
1613                         if (!ECDSA_sign(pkey->save_type,
1614                                 &(data[MD5_DIGEST_LENGTH]),
1615                                 SHA_DIGEST_LENGTH,&(p[2]),
1616                                 (unsigned int *)&j,pkey->pkey.ec))
1617                                 {
1618                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1619                                     ERR_R_ECDSA_LIB);
1620                                 goto err;
1621                                 }
1622                         s2n(j,p);
1623                         n=j+2;
1624                         }
1625                 else
1626 #endif
1627                         {
1628                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1629                         goto err;
1630                         }
1631
1632                 d = dtls1_set_message_header(s, d,
1633                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1634
1635                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1636                 s->init_off=0;
1637
1638                 /* buffer the message to handle re-xmits */
1639                 dtls1_buffer_message(s, 0);
1640
1641                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1642                 }
1643
1644         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1645         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1646 err:
1647         return(-1);
1648         }
1649
1650 int dtls1_send_client_certificate(SSL *s)
1651         {
1652         X509 *x509=NULL;
1653         EVP_PKEY *pkey=NULL;
1654         int i;
1655         unsigned long l;
1656
1657         if (s->state == SSL3_ST_CW_CERT_A)
1658                 {
1659                 if ((s->cert == NULL) ||
1660                         (s->cert->key->x509 == NULL) ||
1661                         (s->cert->key->privatekey == NULL))
1662                         s->state=SSL3_ST_CW_CERT_B;
1663                 else
1664                         s->state=SSL3_ST_CW_CERT_C;
1665                 }
1666
1667         /* We need to get a client cert */
1668         if (s->state == SSL3_ST_CW_CERT_B)
1669                 {
1670                 /* If we get an error, we need to
1671                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1672                  * We then get retied later */
1673                 i=0;
1674                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1675                 if (i < 0)
1676                         {
1677                         s->rwstate=SSL_X509_LOOKUP;
1678                         return(-1);
1679                         }
1680                 s->rwstate=SSL_NOTHING;
1681                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1682                         {
1683                         s->state=SSL3_ST_CW_CERT_B;
1684                         if (    !SSL_use_certificate(s,x509) ||
1685                                 !SSL_use_PrivateKey(s,pkey))
1686                                 i=0;
1687                         }
1688                 else if (i == 1)
1689                         {
1690                         i=0;
1691                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1692                         }
1693
1694                 if (x509 != NULL) X509_free(x509);
1695                 if (pkey != NULL) EVP_PKEY_free(pkey);
1696                 if (i == 0)
1697                         {
1698                         if (s->version == SSL3_VERSION)
1699                                 {
1700                                 s->s3->tmp.cert_req=0;
1701                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1702                                 return(1);
1703                                 }
1704                         else
1705                                 {
1706                                 s->s3->tmp.cert_req=2;
1707                                 }
1708                         }
1709
1710                 /* Ok, we have a cert */
1711                 s->state=SSL3_ST_CW_CERT_C;
1712                 }
1713
1714         if (s->state == SSL3_ST_CW_CERT_C)
1715                 {
1716                 s->state=SSL3_ST_CW_CERT_D;
1717                 l=dtls1_output_cert_chain(s,
1718                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1719                 s->init_num=(int)l;
1720                 s->init_off=0;
1721
1722                 /* set header called by dtls1_output_cert_chain() */
1723
1724                 /* buffer the message to handle re-xmits */
1725                 dtls1_buffer_message(s, 0);
1726                 }
1727         /* SSL3_ST_CW_CERT_D */
1728         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1729         }