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                         s->d1->change_cipher_spec_ok = 0;
 253                         /* Should have been reset by ssl3_get_finished, too. */
 254                         s->s3->change_cipher_spec = 0;
 255                         break;
 256
 257 #ifndef OPENSSL_NO_SCTP
 258                 case DTLS1_SCTP_ST_CR_READ_SOCK:
 259
 260                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
 261                         {
 262                                 s->s3->in_read_app_data=2;
 263                                 s->rwstate=SSL_READING;
 264                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 265                                 BIO_set_retry_read(SSL_get_rbio(s));
 266                                 ret = -1;
 267                                 goto end;
 268                         }
 269
 270                         s->state=s->s3->tmp.next_state;
 271                         break;
 272
 273                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
 274                         /* read app data until dry event */
 275
 276                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
 277                         if (ret < 0) goto end;
 278
 279                         if (ret == 0)
 280                         {
 281                                 s->s3->in_read_app_data=2;
 282                                 s->rwstate=SSL_READING;
 283                                 BIO_clear_retry_flags(SSL_get_rbio(s));
 284                                 BIO_set_retry_read(SSL_get_rbio(s));
 285                                 ret = -1;
 286                                 goto end;
 287                         }
 288
 289                         s->state=s->d1->next_state;
 290                         break;
 291 #endif
 292
 293                 case SSL3_ST_CW_CLNT_HELLO_A:
 294                 case SSL3_ST_CW_CLNT_HELLO_B:
 295
 296                         s->shutdown=0;
 297
 298                         /* every DTLS ClientHello resets Finished MAC */
 299                         ssl3_init_finished_mac(s);
 300
 301                         dtls1_start_timer(s);
 302                         ret=dtls1_client_hello(s);
 303                         if (ret <= 0) goto end;
 304
 305                         if ( s->d1->send_cookie)
 306                                 {
 307                                 s->state=SSL3_ST_CW_FLUSH;
 308                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
 309                                 }
 310                         else
 311                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
 312
 313                         s->init_num=0;
 314
 315 #ifndef OPENSSL_NO_SCTP
 316                         /* Disable buffering for SCTP */
 317                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
 318                                 {
 319 #endif
 320                                 /* turn on buffering for the next lot of output */
 321                                 if (s->bbio != s->wbio)
 322                                         s->wbio=BIO_push(s->bbio,s->wbio);
 323 #ifndef OPENSSL_NO_SCTP
 324                                 }
 325 #endif
 326
 327                         break;
 328
 329                 case SSL3_ST_CR_SRVR_HELLO_A:
 330                 case SSL3_ST_CR_SRVR_HELLO_B:
 331                         ret=ssl3_get_server_hello(s);
 332                         if (ret <= 0) goto end;
 333                         else
 334                                 {
 335                                 if (s->hit)
 336                                         {
 337 #ifndef OPENSSL_NO_SCTP
 338                                         /* Add new shared key for SCTP-Auth,
 339                                          * will be ignored if no SCTP used.
 340                                          */
 341                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 342                                                  DTLS1_SCTP_AUTH_LABEL);
 343
 344                                         SSL_export_keying_material(s, sctpauthkey,
 345                                                                    sizeof(sctpauthkey), labelbuffer,
 346                                                                    sizeof(labelbuffer), NULL, 0, 0);
 347
 348                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 349                                                          sizeof(sctpauthkey), sctpauthkey);
 350 #endif
 351
 352                                         s->state=SSL3_ST_CR_FINISHED_A;
 353                                         }
 354                                 else
 355                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
 356                                 }
 357                         s->init_num=0;
 358                         break;
 359
 360                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
 361                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
 362
 363                         ret = dtls1_get_hello_verify(s);
 364                         if ( ret <= 0)
 365                                 goto end;
 366                         dtls1_stop_timer(s);
 367                         if ( s->d1->send_cookie) /* start again, with a cookie */
 368                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 369                         else
 370                                 s->state = SSL3_ST_CR_CERT_A;
 371                         s->init_num = 0;
 372                         break;
 373
 374                 case SSL3_ST_CR_CERT_A:
 375                 case SSL3_ST_CR_CERT_B:
 376                         /* Check if it is anon DH or PSK */
 377                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 378                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 379                                 {
 380                                 ret=ssl3_get_server_certificate(s);
 381                                 if (ret <= 0) goto end;
 382 #ifndef OPENSSL_NO_TLSEXT
 383                                 if (s->tlsext_status_expected)
 384                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 385                                 else
 386                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 387                                 }
 388                         else
 389                                 {
 390                                 skip = 1;
 391                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 392                                 }
 393 #else
 394                                 }
 395                         else
 396                                 skip=1;
 397
 398                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 399 #endif
 400                         s->init_num=0;
 401                         break;
 402
 403                 case SSL3_ST_CR_KEY_EXCH_A:
 404                 case SSL3_ST_CR_KEY_EXCH_B:
 405                         ret=ssl3_get_key_exchange(s);
 406                         if (ret <= 0) goto end;
 407                         s->state=SSL3_ST_CR_CERT_REQ_A;
 408                         s->init_num=0;
 409
 410                         /* at this point we check that we have the
 411                          * required stuff from the server */
 412                         if (!ssl3_check_cert_and_algorithm(s))
 413                                 {
 414                                 ret= -1;
 415                                 goto end;
 416                                 }
 417                         break;
 418
 419                 case SSL3_ST_CR_CERT_REQ_A:
 420                 case SSL3_ST_CR_CERT_REQ_B:
 421                         ret=ssl3_get_certificate_request(s);
 422                         if (ret <= 0) goto end;
 423                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 424                         s->init_num=0;
 425                         break;
 426
 427                 case SSL3_ST_CR_SRVR_DONE_A:
 428                 case SSL3_ST_CR_SRVR_DONE_B:
 429                         ret=ssl3_get_server_done(s);
 430                         if (ret <= 0) goto end;
 431                         dtls1_stop_timer(s);
 432                         if (s->s3->tmp.cert_req)
 433                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 434                         else
 435                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 436                         s->init_num=0;
 437
 438 #ifndef OPENSSL_NO_SCTP
 439                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 440                             state == SSL_ST_RENEGOTIATE)
 441                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 442                         else
 443 #endif
 444                         s->state=s->s3->tmp.next_state;
 445                         break;
 446
 447                 case SSL3_ST_CW_CERT_A:
 448                 case SSL3_ST_CW_CERT_B:
 449                 case SSL3_ST_CW_CERT_C:
 450                 case SSL3_ST_CW_CERT_D:
 451                         dtls1_start_timer(s);
 452                         ret=dtls1_send_client_certificate(s);
 453                         if (ret <= 0) goto end;
 454                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 455                         s->init_num=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_KEY_EXCH_A:
 459                 case SSL3_ST_CW_KEY_EXCH_B:
 460                         dtls1_start_timer(s);
 461                         ret=dtls1_send_client_key_exchange(s);
 462                         if (ret <= 0) goto end;
 463
 464 #ifndef OPENSSL_NO_SCTP
 465                         /* Add new shared key for SCTP-Auth,
 466                          * will be ignored if no SCTP used.
 467                          */
 468                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 469                                  DTLS1_SCTP_AUTH_LABEL);
 470
 471                         SSL_export_keying_material(s, sctpauthkey,
 472                                                    sizeof(sctpauthkey), labelbuffer,
 473                                                    sizeof(labelbuffer), NULL, 0, 0);
 474
 475                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 476                                          sizeof(sctpauthkey), sctpauthkey);
 477 #endif
 478
 479                         /* EAY EAY EAY need to check for DH fix cert
 480                          * sent back */
 481                         /* For TLS, cert_req is set to 2, so a cert chain
 482                          * of nothing is sent, but no verify packet is sent */
 483                         if (s->s3->tmp.cert_req == 1)
 484                                 {
 485                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 486                                 }
 487                         else
 488                                 {
 489 #ifndef OPENSSL_NO_SCTP
 490                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 491                                         {
 492                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 493                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 494                                         }
 495                                 else
 496 #endif
 497                                         s->state=SSL3_ST_CW_CHANGE_A;
 498                                 }
 499
 500                         s->init_num=0;
 501                         break;
 502
 503                 case SSL3_ST_CW_CERT_VRFY_A:
 504                 case SSL3_ST_CW_CERT_VRFY_B:
 505                         dtls1_start_timer(s);
 506                         ret=dtls1_send_client_verify(s);
 507                         if (ret <= 0) goto end;
 508 #ifndef OPENSSL_NO_SCTP
 509                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 510                         {
 511                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 512                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 513                         }
 514                         else
 515 #endif
 516                                 s->state=SSL3_ST_CW_CHANGE_A;
 517                         s->init_num=0;
 518                         break;
 519
 520                 case SSL3_ST_CW_CHANGE_A:
 521                 case SSL3_ST_CW_CHANGE_B:
 522                         if (!s->hit)
 523                                 dtls1_start_timer(s);
 524                         ret=dtls1_send_change_cipher_spec(s,
 525                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 526                         if (ret <= 0) goto end;
 527
 528                         s->state=SSL3_ST_CW_FINISHED_A;
 529                         s->init_num=0;
 530
 531                         s->session->cipher=s->s3->tmp.new_cipher;
 532 #ifdef OPENSSL_NO_COMP
 533                         s->session->compress_meth=0;
 534 #else
 535                         if (s->s3->tmp.new_compression == NULL)
 536                                 s->session->compress_meth=0;
 537                         else
 538                                 s->session->compress_meth=
 539                                         s->s3->tmp.new_compression->id;
 540 #endif
 541                         if (!s->method->ssl3_enc->setup_key_block(s))
 542                                 {
 543                                 ret= -1;
 544                                 goto end;
 545                                 }
 546
 547                         if (!s->method->ssl3_enc->change_cipher_state(s,
 548                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 549                                 {
 550                                 ret= -1;
 551                                 goto end;
 552                                 }
 553
 554 #ifndef OPENSSL_NO_SCTP
 555                                 if (s->hit)
 556                                         {
 557                                         /* Change to new shared key of SCTP-Auth,
 558                                          * will be ignored if no SCTP used.
 559                                          */
 560                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 561                                         }
 562 #endif
 563
 564                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 565                         break;
 566
 567                 case SSL3_ST_CW_FINISHED_A:
 568                 case SSL3_ST_CW_FINISHED_B:
 569                         if (!s->hit)
 570                                 dtls1_start_timer(s);
 571                         ret=dtls1_send_finished(s,
 572                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 573                                 s->method->ssl3_enc->client_finished_label,
 574                                 s->method->ssl3_enc->client_finished_label_len);
 575                         if (ret <= 0) goto end;
 576                         s->state=SSL3_ST_CW_FLUSH;
 577
 578                         /* clear flags */
 579                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 580                         if (s->hit)
 581                                 {
 582                                 s->s3->tmp.next_state=SSL_ST_OK;
 583 #ifndef OPENSSL_NO_SCTP
 584                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 585                                         {
 586                                                 s->d1->next_state = s->s3->tmp.next_state;
 587                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 588                                         }
 589 #endif
 590                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 591                                         {
 592                                         s->state=SSL_ST_OK;
 593 #ifndef OPENSSL_NO_SCTP
 594                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 595                                                 {
 596                                                         s->d1->next_state = SSL_ST_OK;
 597                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 598                                                 }
 599 #endif
 600                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 601                                         s->s3->delay_buf_pop_ret=0;
 602                                         }
 603                                 }
 604                         else
 605                                 {
 606 #ifndef OPENSSL_NO_SCTP
 607                                 /* Change to new shared key of SCTP-Auth,
 608                                  * will be ignored if no SCTP used.
 609                                  */
 610                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 611 #endif
 612
 613 #ifndef OPENSSL_NO_TLSEXT
 614                                 /* Allow NewSessionTicket if ticket expected */
 615                                 if (s->tlsext_ticket_expected)
 616                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 617                                 else
 618 #endif
 619
 620                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 621                                 }
 622                         s->init_num=0;
 623                         break;
 624
 625 #ifndef OPENSSL_NO_TLSEXT
 626                 case SSL3_ST_CR_SESSION_TICKET_A:
 627                 case SSL3_ST_CR_SESSION_TICKET_B:
 628                         ret=ssl3_get_new_session_ticket(s);
 629                         if (ret <= 0) goto end;
 630                         s->state=SSL3_ST_CR_FINISHED_A;
 631                         s->init_num=0;
 632                 break;
 633
 634                 case SSL3_ST_CR_CERT_STATUS_A:
 635                 case SSL3_ST_CR_CERT_STATUS_B:
 636                         ret=ssl3_get_cert_status(s);
 637                         if (ret <= 0) goto end;
 638                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 639                         s->init_num=0;
 640                 break;
 641 #endif
 642
 643                 case SSL3_ST_CR_FINISHED_A:
 644                 case SSL3_ST_CR_FINISHED_B:
 645                         s->d1->change_cipher_spec_ok = 1;
 646                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 647                                 SSL3_ST_CR_FINISHED_B);
 648                         if (ret <= 0) goto end;
 649                         dtls1_stop_timer(s);
 650
 651                         if (s->hit)
 652                                 s->state=SSL3_ST_CW_CHANGE_A;
 653                         else
 654                                 s->state=SSL_ST_OK;
 655
 656 #ifndef OPENSSL_NO_SCTP
 657                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 658                                 state == SSL_ST_RENEGOTIATE)
 659                                 {
 660                                 s->d1->next_state=s->state;
 661                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 662                                 }
 663 #endif
 664
 665                         s->init_num=0;
 666                         break;
 667
 668                 case SSL3_ST_CW_FLUSH:
 669                         s->rwstate=SSL_WRITING;
 670                         if (BIO_flush(s->wbio) <= 0)
 671                                 {
 672                                 /* If the write error was fatal, stop trying */
 673                                 if (!BIO_should_retry(s->wbio))
 674                                         {
 675                                         s->rwstate=SSL_NOTHING;
 676                                         s->state=s->s3->tmp.next_state;
 677                                         }
 678
 679                                 ret= -1;
 680                                 goto end;
 681                                 }
 682                         s->rwstate=SSL_NOTHING;
 683                         s->state=s->s3->tmp.next_state;
 684                         break;
 685
 686                 case SSL_ST_OK:
 687                         /* clean a few things up */
 688                         ssl3_cleanup_key_block(s);
 689
 690 #if 0
 691                         if (s->init_buf != NULL)
 692                                 {
 693                                 BUF_MEM_free(s->init_buf);
 694                                 s->init_buf=NULL;
 695                                 }
 696 #endif
 697
 698                         /* If we are not 'joining' the last two packets,
 699                          * remove the buffering now */
 700                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 701                                 ssl_free_wbio_buffer(s);
 702                         /* else do it later in ssl3_write */
 703
 704                         s->init_num=0;
 705                         s->renegotiate=0;
 706                         s->new_session=0;
 707
 708                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 709                         if (s->hit) s->ctx->stats.sess_hit++;
 710
 711                         ret=1;
 712                         /* s->server=0; */
 713                         s->handshake_func=dtls1_connect;
 714                         s->ctx->stats.sess_connect_good++;
 715
 716                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 717
 718                         /* done with handshaking */
 719                         s->d1->handshake_read_seq  = 0;
 720                         s->d1->next_handshake_write_seq = 0;
 721                         goto end;
 722                         /* break; */
 723
 724                 default:
 725                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 726                         ret= -1;
 727                         goto end;
 728                         /* break; */
 729                         }
 730
 731                 /* did we do anything */
 732                 if (!s->s3->tmp.reuse_message && !skip)
 733                         {
 734                         if (s->debug)
 735                                 {
 736                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 737                                         goto end;
 738                                 }
 739
 740                         if ((cb != NULL) && (s->state != state))
 741                                 {
 742                                 new_state=s->state;
 743                                 s->state=state;
 744                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 745                                 s->state=new_state;
 746                                 }
 747                         }
 748                 skip=0;
 749                 }
 750 end:
 751         s->in_handshake--;
 752
 753 #ifndef OPENSSL_NO_SCTP
 754         /* Notify SCTP BIO socket to leave handshake
 755          * mode and allow stream identifier other
 756          * than 0. Will be ignored if no SCTP is used.
 757          */
 758         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 759 #endif
 760
 761         if (buf != NULL)
 762                 BUF_MEM_free(buf);
 763         if (cb != NULL)
 764                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 765         return(ret);
 766         }
 767
 768 int dtls1_client_hello(SSL *s)
 769         {
 770         unsigned char *buf;
 771         unsigned char *p,*d;
 772         unsigned int i,j;
 773         unsigned long l;
 774         SSL_COMP *comp;
 775
 776         buf=(unsigned char *)s->init_buf->data;
 777         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 778                 {
 779                 SSL_SESSION *sess = s->session;
 780                 if ((s->session == NULL) ||
 781                         (s->session->ssl_version != s->version) ||
 782 #ifdef OPENSSL_NO_TLSEXT
 783                         !sess->session_id_length ||
 784 #else
 785                         (!sess->session_id_length && !sess->tlsext_tick) ||
 786 #endif
 787                         (s->session->not_resumable))
 788                         {
 789                         if (!ssl_get_new_session(s,0))
 790                                 goto err;
 791                         }
 792                 /* else use the pre-loaded session */
 793
 794                 p=s->s3->client_random;
 795
 796                 /* if client_random is initialized, reuse it, we are
 797                  * required to use same upon reply to HelloVerify */
 798                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++)
 799                         ;
 800                 if (i==sizeof(s->s3->client_random))
 801                         ssl_fill_hello_random(s, 0, p,
 802                                               sizeof(s->s3->client_random));
 803
 804                 /* Do the message type and length last */
 805                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 806
 807                 *(p++)=s->version>>8;
 808                 *(p++)=s->version&0xff;
 809                 s->client_version=s->version;
 810
 811                 /* Random stuff */
 812                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 813                 p+=SSL3_RANDOM_SIZE;
 814
 815                 /* Session ID */
 816                 if (s->new_session)
 817                         i=0;
 818                 else
 819                         i=s->session->session_id_length;
 820                 *(p++)=i;
 821                 if (i != 0)
 822                         {
 823                         if (i > sizeof s->session->session_id)
 824                                 {
 825                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 826                                 goto err;
 827                                 }
 828                         memcpy(p,s->session->session_id,i);
 829                         p+=i;
 830                         }
 831
 832                 /* cookie stuff */
 833                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 834                         {
 835                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 836                         goto err;
 837                         }
 838                 *(p++) = s->d1->cookie_len;
 839                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 840                 p += s->d1->cookie_len;
 841
 842                 /* Ciphers supported */
 843                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 844                 if (i == 0)
 845                         {
 846                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 847                         goto err;
 848                         }
 849                 s2n(i,p);
 850                 p+=i;
 851
 852                 /* COMPRESSION */
 853                 if (s->ctx->comp_methods == NULL)
 854                         j=0;
 855                 else
 856                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 857                 *(p++)=1+j;
 858                 for (i=0; i<j; i++)
 859                         {
 860                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 861                         *(p++)=comp->id;
 862                         }
 863                 *(p++)=0; /* Add the NULL method */
 864
 865 #ifndef OPENSSL_NO_TLSEXT
 866                 /* TLS extensions*/
 867                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 868                         {
 869                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 870                         goto err;
 871                         }
 872                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 873                         {
 874                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 875                         goto err;
 876                         }
 877 #endif
 878
 879                 l=(p-d);
 880                 d=buf;
 881
 882                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 883
 884                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 885                 /* number of bytes to write */
 886                 s->init_num=p-buf;
 887                 s->init_off=0;
 888
 889                 /* buffer the message to handle re-xmits */
 890                 dtls1_buffer_message(s, 0);
 891                 }
 892
 893         /* SSL3_ST_CW_CLNT_HELLO_B */
 894         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 895 err:
 896         return(-1);
 897         }
 898
 899 static int dtls1_get_hello_verify(SSL *s)
 900         {
 901         int n, al, ok = 0;
 902         unsigned char *data;
 903         unsigned int cookie_len;
 904
 905         n=s->method->ssl_get_message(s,
 906                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 907                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 908                 -1,
 909                 s->max_cert_list,
 910                 &ok);
 911
 912         if (!ok) return((int)n);
 913
 914         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 915                 {
 916                 s->d1->send_cookie = 0;
 917                 s->s3->tmp.reuse_message=1;
 918                 return(1);
 919                 }
 920
 921         data = (unsigned char *)s->init_msg;
 922
 923         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 924                 {
 925                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 926                 s->version=(s->version&0xff00)|data[1];
 927                 al = SSL_AD_PROTOCOL_VERSION;
 928                 goto f_err;
 929                 }
 930         data+=2;
 931
 932         cookie_len = *(data++);
 933         if ( cookie_len > sizeof(s->d1->cookie))
 934                 {
 935                 al=SSL_AD_ILLEGAL_PARAMETER;
 936                 goto f_err;
 937                 }
 938
 939         memcpy(s->d1->cookie, data, cookie_len);
 940         s->d1->cookie_len = cookie_len;
 941
 942         s->d1->send_cookie = 1;
 943         return 1;
 944
 945 f_err:
 946         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 947         return -1;
 948         }
 949
 950 int dtls1_send_client_key_exchange(SSL *s)
 951         {
 952         unsigned char *p,*d;
 953         int n;
 954         unsigned long alg_k;
 955 #ifndef OPENSSL_NO_RSA
 956         unsigned char *q;
 957         EVP_PKEY *pkey=NULL;
 958 #endif
 959 #ifndef OPENSSL_NO_KRB5
 960         KSSL_ERR kssl_err;
 961 #endif /* OPENSSL_NO_KRB5 */
 962 #ifndef OPENSSL_NO_ECDH
 963         EC_KEY *clnt_ecdh = NULL;
 964         const EC_POINT *srvr_ecpoint = NULL;
 965         EVP_PKEY *srvr_pub_pkey = NULL;
 966         unsigned char *encodedPoint = NULL;
 967         int encoded_pt_len = 0;
 968         BN_CTX * bn_ctx = NULL;
 969 #endif
 970
 971         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 972                 {
 973                 d=(unsigned char *)s->init_buf->data;
 974                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 975
 976                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 977
 978                 /* Fool emacs indentation */
 979                 if (0) {}
 980 #ifndef OPENSSL_NO_RSA
 981                 else if (alg_k & SSL_kRSA)
 982                         {
 983                         RSA *rsa;
 984                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 985
 986                         if (s->session->sess_cert == NULL)
 987                                 {
 988                                 /* We should always have a server certificate with SSL_kRSA. */
 989                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
 990                                 goto err;
 991                                 }
 992
 993                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 994                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 995                         else
 996                                 {
 997                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 998                                 if ((pkey == NULL) ||
 999                                         (pkey->type != EVP_PKEY_RSA) ||
1000                                         (pkey->pkey.rsa == NULL))
1001                                         {
1002                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1003                                         goto err;
1004                                         }
1005                                 rsa=pkey->pkey.rsa;
1006                                 EVP_PKEY_free(pkey);
1007                                 }
1008
1009                         tmp_buf[0]=s->client_version>>8;
1010                         tmp_buf[1]=s->client_version&0xff;
1011                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1012                                         goto err;
1013
1014                         s->session->master_key_length=sizeof tmp_buf;
1015
1016                         q=p;
1017                         /* Fix buf for TLS and [incidentally] DTLS */
1018                         if (s->version > SSL3_VERSION)
1019                                 p+=2;
1020                         n=RSA_public_encrypt(sizeof tmp_buf,
1021                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1022 #ifdef PKCS1_CHECK
1023                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1024                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1025 #endif
1026                         if (n <= 0)
1027                                 {
1028                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1029                                 goto err;
1030                                 }
1031
1032                         /* Fix buf for TLS and [incidentally] DTLS */
1033                         if (s->version > SSL3_VERSION)
1034                                 {
1035                                 s2n(n,q);
1036                                 n+=2;
1037                                 }
1038
1039                         s->session->master_key_length=
1040                                 s->method->ssl3_enc->generate_master_secret(s,
1041                                         s->session->master_key,
1042                                         tmp_buf,sizeof tmp_buf);
1043                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1044                         }
1045 #endif
1046 #ifndef OPENSSL_NO_KRB5
1047                 else if (alg_k & SSL_kKRB5)
1048                         {
1049                         krb5_error_code krb5rc;
1050                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1051                         /*  krb5_data   krb5_ap_req;  */
1052                         krb5_data       *enc_ticket;
1053                         krb5_data       authenticator, *authp = NULL;
1054                         EVP_CIPHER_CTX  ciph_ctx;
1055                         const EVP_CIPHER *enc = NULL;
1056                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1057                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1058                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1059                                                 + EVP_MAX_IV_LENGTH];
1060                         int             padl, outl = sizeof(epms);
1061
1062                         EVP_CIPHER_CTX_init(&ciph_ctx);
1063
1064 #ifdef KSSL_DEBUG
1065                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1066                                 alg_k, SSL_kKRB5);
1067 #endif  /* KSSL_DEBUG */
1068
1069                         authp = NULL;
1070 #ifdef KRB5SENDAUTH
1071                         if (KRB5SENDAUTH)  authp = &authenticator;
1072 #endif  /* KRB5SENDAUTH */
1073
1074                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1075                                 &kssl_err);
1076                         enc = kssl_map_enc(kssl_ctx->enctype);
1077                         if (enc == NULL)
1078                             goto err;
1079 #ifdef KSSL_DEBUG
1080                         {
1081                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1082                         if (krb5rc && kssl_err.text)
1083                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1084                         }
1085 #endif  /* KSSL_DEBUG */
1086
1087                         if (krb5rc)
1088                                 {
1089                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1090                                                 SSL_AD_HANDSHAKE_FAILURE);
1091                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1092                                                 kssl_err.reason);
1093                                 goto err;
1094                                 }
1095
1096                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1097                         **  in place of RFC 2712 KerberosWrapper, as in:
1098                         **
1099                         **  Send ticket (copy to *p, set n = length)
1100                         **  n = krb5_ap_req.length;
1101                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1102                         **  if (krb5_ap_req.data)
1103                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1104                         **
1105                         **  Now using real RFC 2712 KerberosWrapper
1106                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1107                         **  Note: 2712 "opaque" types are here replaced
1108                         **  with a 2-byte length followed by the value.
1109                         **  Example:
1110                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1111                         **  Where "xx xx" = length bytes.  Shown here with
1112                         **  optional authenticator omitted.
1113                         */
1114
1115                         /*  KerberosWrapper.Ticket              */
1116                         s2n(enc_ticket->length,p);
1117                         memcpy(p, enc_ticket->data, enc_ticket->length);
1118                         p+= enc_ticket->length;
1119                         n = enc_ticket->length + 2;
1120
1121                         /*  KerberosWrapper.Authenticator       */
1122                         if (authp  &&  authp->length)
1123                                 {
1124                                 s2n(authp->length,p);
1125                                 memcpy(p, authp->data, authp->length);
1126                                 p+= authp->length;
1127                                 n+= authp->length + 2;
1128
1129                                 free(authp->data);
1130                                 authp->data = NULL;
1131                                 authp->length = 0;
1132                                 }
1133                         else
1134                                 {
1135                                 s2n(0,p);/*  null authenticator length  */
1136                                 n+=2;
1137                                 }
1138
1139                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1140                             goto err;
1141
1142                         /*  20010420 VRS.  Tried it this way; failed.
1143                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1144                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1145                         **                              kssl_ctx->length);
1146                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1147                         */
1148
1149                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1150                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1151                                 kssl_ctx->key,iv);
1152                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1153                                 sizeof tmp_buf);
1154                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1155                         outl += padl;
1156                         if (outl > (int)sizeof epms)
1157                                 {
1158                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1159                                 goto err;
1160                                 }
1161                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1162
1163                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1164                         s2n(outl,p);
1165                         memcpy(p, epms, outl);
1166                         p+=outl;
1167                         n+=outl + 2;
1168
1169                         s->session->master_key_length=
1170                                 s->method->ssl3_enc->generate_master_secret(s,
1171                                         s->session->master_key,
1172                                         tmp_buf, sizeof tmp_buf);
1173
1174                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1175                         OPENSSL_cleanse(epms, outl);
1176                         }
1177 #endif
1178 #ifndef OPENSSL_NO_DH
1179                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1180                         {
1181                         DH *dh_srvr,*dh_clnt;
1182
1183                         if (s->session->sess_cert == NULL)
1184                                 {
1185                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1186                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1187                                 goto err;
1188                                 }
1189
1190                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1191                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1192                         else
1193                                 {
1194                                 /* we get them from the cert */
1195                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1196                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1197                                 goto err;
1198                                 }
1199
1200                         /* generate a new random key */
1201                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1202                                 {
1203                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1204                                 goto err;
1205                                 }
1206                         if (!DH_generate_key(dh_clnt))
1207                                 {
1208                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1209                                 goto err;
1210                                 }
1211
1212                         /* use the 'p' output buffer for the DH key, but
1213                          * make sure to clear it out afterwards */
1214
1215                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1216
1217                         if (n <= 0)
1218                                 {
1219                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1220                                 goto err;
1221                                 }
1222
1223                         /* generate master key from the result */
1224                         s->session->master_key_length=
1225                                 s->method->ssl3_enc->generate_master_secret(s,
1226                                         s->session->master_key,p,n);
1227                         /* clean up */
1228                         memset(p,0,n);
1229
1230                         /* send off the data */
1231                         n=BN_num_bytes(dh_clnt->pub_key);
1232                         s2n(n,p);
1233                         BN_bn2bin(dh_clnt->pub_key,p);
1234                         n+=2;
1235
1236                         DH_free(dh_clnt);
1237
1238                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1239                         }
1240 #endif
1241 #ifndef OPENSSL_NO_ECDH
1242                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1243                         {
1244                         const EC_GROUP *srvr_group = NULL;
1245                         EC_KEY *tkey;
1246                         int ecdh_clnt_cert = 0;
1247                         int field_size = 0;
1248
1249                         if (s->session->sess_cert == NULL)
1250                                 {
1251                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1252                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1253                                 goto err;
1254                                 }
1255
1256                         /* Did we send out the client's
1257                          * ECDH share for use in premaster
1258                          * computation as part of client certificate?
1259                          * If so, set ecdh_clnt_cert to 1.
1260                          */
1261                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1262                                 {
1263                                 /* XXX: For now, we do not support client
1264                                  * authentication using ECDH certificates.
1265                                  * To add such support, one needs to add
1266                                  * code that checks for appropriate
1267                                  * conditions and sets ecdh_clnt_cert to 1.
1268                                  * For example, the cert have an ECC
1269                                  * key on the same curve as the server's
1270                                  * and the key should be authorized for
1271                                  * key agreement.
1272                                  *
1273                                  * One also needs to add code in ssl3_connect
1274                                  * to skip sending the certificate verify
1275                                  * message.
1276                                  *
1277                                  * if ((s->cert->key->privatekey != NULL) &&
1278                                  *     (s->cert->key->privatekey->type ==
1279                                  *      EVP_PKEY_EC) && ...)
1280                                  * ecdh_clnt_cert = 1;
1281                                  */
1282                                 }
1283
1284                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1285                                 {
1286                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1287                                 }
1288                         else
1289                                 {
1290                                 /* Get the Server Public Key from Cert */
1291                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1292                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1293                                 if ((srvr_pub_pkey == NULL) ||
1294                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1295                                     (srvr_pub_pkey->pkey.ec == NULL))
1296                                         {
1297                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1298                                             ERR_R_INTERNAL_ERROR);
1299                                         goto err;
1300                                         }
1301
1302                                 tkey = srvr_pub_pkey->pkey.ec;
1303                                 }
1304
1305                         srvr_group   = EC_KEY_get0_group(tkey);
1306                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1307
1308                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1309                                 {
1310                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1311                                     ERR_R_INTERNAL_ERROR);
1312                                 goto err;
1313                                 }
1314
1315                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1316                                 {
1317                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1318                                 goto err;
1319                                 }
1320
1321                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1322                                 {
1323                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1324                                 goto err;
1325                                 }
1326                         if (ecdh_clnt_cert)
1327                                 {
1328                                 /* Reuse key info from our certificate
1329                                  * We only need our private key to perform
1330                                  * the ECDH computation.
1331                                  */
1332                                 const BIGNUM *priv_key;
1333                                 tkey = s->cert->key->privatekey->pkey.ec;
1334                                 priv_key = EC_KEY_get0_private_key(tkey);
1335                                 if (priv_key == NULL)
1336                                         {
1337                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1338                                         goto err;
1339                                         }
1340                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1341                                         {
1342                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1343                                         goto err;
1344                                         }
1345                                 }
1346                         else
1347                                 {
1348                                 /* Generate a new ECDH key pair */
1349                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1350                                         {
1351                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1352                                         goto err;
1353                                         }
1354                                 }
1355
1356                         /* use the 'p' output buffer for the ECDH key, but
1357                          * make sure to clear it out afterwards
1358                          */
1359
1360                         field_size = EC_GROUP_get_degree(srvr_group);
1361                         if (field_size <= 0)
1362                                 {
1363                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1364                                        ERR_R_ECDH_LIB);
1365                                 goto err;
1366                                 }
1367                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1368                         if (n <= 0)
1369                                 {
1370                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1371                                        ERR_R_ECDH_LIB);
1372                                 goto err;
1373                                 }
1374
1375                         /* generate master key from the result */
1376                         s->session->master_key_length = s->method->ssl3_enc \
1377                             -> generate_master_secret(s,
1378                                 s->session->master_key,
1379                                 p, n);
1380
1381                         memset(p, 0, n); /* clean up */
1382
1383                         if (ecdh_clnt_cert)
1384                                 {
1385                                 /* Send empty client key exch message */
1386                                 n = 0;
1387                                 }
1388                         else
1389                                 {
1390                                 /* First check the size of encoding and
1391                                  * allocate memory accordingly.
1392                                  */
1393                                 encoded_pt_len =
1394                                     EC_POINT_point2oct(srvr_group,
1395                                         EC_KEY_get0_public_key(clnt_ecdh),
1396                                         POINT_CONVERSION_UNCOMPRESSED,
1397                                         NULL, 0, NULL);
1398
1399                                 encodedPoint = (unsigned char *)
1400                                     OPENSSL_malloc(encoded_pt_len *
1401                                         sizeof(unsigned char));
1402                                 bn_ctx = BN_CTX_new();
1403                                 if ((encodedPoint == NULL) ||
1404                                     (bn_ctx == NULL))
1405                                         {
1406                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1407                                         goto err;
1408                                         }
1409
1410                                 /* Encode the public key */
1411                                 n = EC_POINT_point2oct(srvr_group,
1412                                     EC_KEY_get0_public_key(clnt_ecdh),
1413                                     POINT_CONVERSION_UNCOMPRESSED,
1414                                     encodedPoint, encoded_pt_len, bn_ctx);
1415
1416                                 *p = n; /* length of encoded point */
1417                                 /* Encoded point will be copied here */
1418                                 p += 1;
1419                                 /* copy the point */
1420                                 memcpy((unsigned char *)p, encodedPoint, n);
1421                                 /* increment n to account for length field */
1422                                 n += 1;
1423                                 }
1424
1425                         /* Free allocated memory */
1426                         BN_CTX_free(bn_ctx);
1427                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1428                         if (clnt_ecdh != NULL)
1429                                  EC_KEY_free(clnt_ecdh);
1430                         EVP_PKEY_free(srvr_pub_pkey);
1431                         }
1432 #endif /* !OPENSSL_NO_ECDH */
1433
1434 #ifndef OPENSSL_NO_PSK
1435                 else if (alg_k & SSL_kPSK)
1436                         {
1437                         char identity[PSK_MAX_IDENTITY_LEN];
1438                         unsigned char *t = NULL;
1439                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1440                         unsigned int pre_ms_len = 0, psk_len = 0;
1441                         int psk_err = 1;
1442
1443                         n = 0;
1444                         if (s->psk_client_callback == NULL)
1445                                 {
1446                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1447                                         SSL_R_PSK_NO_CLIENT_CB);
1448                                 goto err;
1449                                 }
1450
1451                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1452                                 identity, PSK_MAX_IDENTITY_LEN,
1453                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1454                         if (psk_len > PSK_MAX_PSK_LEN)
1455                                 {
1456                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1457                                         ERR_R_INTERNAL_ERROR);
1458                                 goto psk_err;
1459                                 }
1460                         else if (psk_len == 0)
1461                                 {
1462                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1463                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1464                                 goto psk_err;
1465                                 }
1466
1467                         /* create PSK pre_master_secret */
1468                         pre_ms_len = 2+psk_len+2+psk_len;
1469                         t = psk_or_pre_ms;
1470                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1471                         s2n(psk_len, t);
1472                         memset(t, 0, psk_len);
1473                         t+=psk_len;
1474                         s2n(psk_len, t);
1475
1476                         if (s->session->psk_identity_hint != NULL)
1477                                 OPENSSL_free(s->session->psk_identity_hint);
1478                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1479                         if (s->ctx->psk_identity_hint != NULL &&
1480                                 s->session->psk_identity_hint == NULL)
1481                                 {
1482                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1483                                         ERR_R_MALLOC_FAILURE);
1484                                 goto psk_err;
1485                                 }
1486
1487                         if (s->session->psk_identity != NULL)
1488                                 OPENSSL_free(s->session->psk_identity);
1489                         s->session->psk_identity = BUF_strdup(identity);
1490                         if (s->session->psk_identity == NULL)
1491                                 {
1492                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1493                                         ERR_R_MALLOC_FAILURE);
1494                                 goto psk_err;
1495                                 }
1496
1497                         s->session->master_key_length =
1498                                 s->method->ssl3_enc->generate_master_secret(s,
1499                                         s->session->master_key,
1500                                         psk_or_pre_ms, pre_ms_len);
1501                         n = strlen(identity);
1502                         s2n(n, p);
1503                         memcpy(p, identity, n);
1504                         n+=2;
1505                         psk_err = 0;
1506                 psk_err:
1507                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1508                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1509                         if (psk_err != 0)
1510                                 {
1511                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1512                                 goto err;
1513                                 }
1514                         }
1515 #endif
1516                 else
1517                         {
1518                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1519                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1520                         goto err;
1521                         }
1522
1523                 d = dtls1_set_message_header(s, d,
1524                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1525                 /*
1526                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1527                  l2n3(n,d);
1528                  l2n(s->d1->handshake_write_seq,d);
1529                  s->d1->handshake_write_seq++;
1530                 */
1531
1532                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1533                 /* number of bytes to write */
1534                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1535                 s->init_off=0;
1536
1537                 /* buffer the message to handle re-xmits */
1538                 dtls1_buffer_message(s, 0);
1539                 }
1540
1541         /* SSL3_ST_CW_KEY_EXCH_B */
1542         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1543 err:
1544 #ifndef OPENSSL_NO_ECDH
1545         BN_CTX_free(bn_ctx);
1546         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1547         if (clnt_ecdh != NULL)
1548                 EC_KEY_free(clnt_ecdh);
1549         EVP_PKEY_free(srvr_pub_pkey);
1550 #endif
1551         return(-1);
1552         }
1553
1554 int dtls1_send_client_verify(SSL *s)
1555         {
1556         unsigned char *p,*d;
1557         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1558         EVP_PKEY *pkey;
1559 #ifndef OPENSSL_NO_RSA
1560         unsigned u=0;
1561 #endif
1562         unsigned long n;
1563 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1564         int j;
1565 #endif
1566
1567         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1568                 {
1569                 d=(unsigned char *)s->init_buf->data;
1570                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1571                 pkey=s->cert->key->privatekey;
1572
1573                 s->method->ssl3_enc->cert_verify_mac(s,
1574                 NID_sha1,
1575                         &(data[MD5_DIGEST_LENGTH]));
1576
1577 #ifndef OPENSSL_NO_RSA
1578                 if (pkey->type == EVP_PKEY_RSA)
1579                         {
1580                         s->method->ssl3_enc->cert_verify_mac(s,
1581                                 NID_md5,
1582                                 &(data[0]));
1583                         if (RSA_sign(NID_md5_sha1, data,
1584                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1585                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1586                                 {
1587                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1588                                 goto err;
1589                                 }
1590                         s2n(u,p);
1591                         n=u+2;
1592                         }
1593                 else
1594 #endif
1595 #ifndef OPENSSL_NO_DSA
1596                         if (pkey->type == EVP_PKEY_DSA)
1597                         {
1598                         if (!DSA_sign(pkey->save_type,
1599                                 &(data[MD5_DIGEST_LENGTH]),
1600                                 SHA_DIGEST_LENGTH,&(p[2]),
1601                                 (unsigned int *)&j,pkey->pkey.dsa))
1602                                 {
1603                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1604                                 goto err;
1605                                 }
1606                         s2n(j,p);
1607                         n=j+2;
1608                         }
1609                 else
1610 #endif
1611 #ifndef OPENSSL_NO_ECDSA
1612                         if (pkey->type == EVP_PKEY_EC)
1613                         {
1614                         if (!ECDSA_sign(pkey->save_type,
1615                                 &(data[MD5_DIGEST_LENGTH]),
1616                                 SHA_DIGEST_LENGTH,&(p[2]),
1617                                 (unsigned int *)&j,pkey->pkey.ec))
1618                                 {
1619                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1620                                     ERR_R_ECDSA_LIB);
1621                                 goto err;
1622                                 }
1623                         s2n(j,p);
1624                         n=j+2;
1625                         }
1626                 else
1627 #endif
1628                         {
1629                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1630                         goto err;
1631                         }
1632
1633                 d = dtls1_set_message_header(s, d,
1634                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1635
1636                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1637                 s->init_off=0;
1638
1639                 /* buffer the message to handle re-xmits */
1640                 dtls1_buffer_message(s, 0);
1641
1642                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1643                 }
1644
1645         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1646         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1647 err:
1648         return(-1);
1649         }
1650
1651 int dtls1_send_client_certificate(SSL *s)
1652         {
1653         X509 *x509=NULL;
1654         EVP_PKEY *pkey=NULL;
1655         int i;
1656         unsigned long l;
1657
1658         if (s->state == SSL3_ST_CW_CERT_A)
1659                 {
1660                 if ((s->cert == NULL) ||
1661                         (s->cert->key->x509 == NULL) ||
1662                         (s->cert->key->privatekey == NULL))
1663                         s->state=SSL3_ST_CW_CERT_B;
1664                 else
1665                         s->state=SSL3_ST_CW_CERT_C;
1666                 }
1667
1668         /* We need to get a client cert */
1669         if (s->state == SSL3_ST_CW_CERT_B)
1670                 {
1671                 /* If we get an error, we need to
1672                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1673                  * We then get retied later */
1674                 i=0;
1675                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1676                 if (i < 0)
1677                         {
1678                         s->rwstate=SSL_X509_LOOKUP;
1679                         return(-1);
1680                         }
1681                 s->rwstate=SSL_NOTHING;
1682                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1683                         {
1684                         s->state=SSL3_ST_CW_CERT_B;
1685                         if (    !SSL_use_certificate(s,x509) ||
1686                                 !SSL_use_PrivateKey(s,pkey))
1687                                 i=0;
1688                         }
1689                 else if (i == 1)
1690                         {
1691                         i=0;
1692                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1693                         }
1694
1695                 if (x509 != NULL) X509_free(x509);
1696                 if (pkey != NULL) EVP_PKEY_free(pkey);
1697                 if (i == 0)
1698                         {
1699                         if (s->version == SSL3_VERSION)
1700                                 {
1701                                 s->s3->tmp.cert_req=0;
1702                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1703                                 return(1);
1704                                 }
1705                         else
1706                                 {
1707                                 s->s3->tmp.cert_req=2;
1708                                 }
1709                         }
1710
1711                 /* Ok, we have a cert */
1712                 s->state=SSL3_ST_CW_CERT_C;
1713                 }
1714
1715         if (s->state == SSL3_ST_CW_CERT_C)
1716                 {
1717                 s->state=SSL3_ST_CW_CERT_D;
1718                 l=dtls1_output_cert_chain(s,
1719                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1720                 s->init_num=(int)l;
1721                 s->init_off=0;
1722
1723                 /* set header called by dtls1_output_cert_chain() */
1724
1725                 /* buffer the message to handle re-xmits */
1726                 dtls1_buffer_message(s, 0);
1727                 }
1728         /* SSL3_ST_CW_CERT_D */
1729         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1730         }