src/third_party/openssl/openssl/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 #ifndef OPENSSL_NO_TLSEXT
 374                         ret=ssl3_check_finished(s);
 375                         if (ret <= 0) goto end;
 376                         if (ret == 2)
 377                                 {
 378                                 s->hit = 1;
 379                                 if (s->tlsext_ticket_expected)
 380                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 381                                 else
 382                                         s->state=SSL3_ST_CR_FINISHED_A;
 383                                 s->init_num=0;
 384                                 break;
 385                                 }
 386 #endif
 387                         /* Check if it is anon DH or PSK */
 388                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 389                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 390                                 {
 391                                 ret=ssl3_get_server_certificate(s);
 392                                 if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                                 if (s->tlsext_status_expected)
 395                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 396                                 else
 397                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 398                                 }
 399                         else
 400                                 {
 401                                 skip = 1;
 402                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 403                                 }
 404 #else
 405                                 }
 406                         else
 407                                 skip=1;
 408
 409                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 410 #endif
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_CR_KEY_EXCH_A:
 415                 case SSL3_ST_CR_KEY_EXCH_B:
 416                         ret=ssl3_get_key_exchange(s);
 417                         if (ret <= 0) goto end;
 418                         s->state=SSL3_ST_CR_CERT_REQ_A;
 419                         s->init_num=0;
 420
 421                         /* at this point we check that we have the
 422                          * required stuff from the server */
 423                         if (!ssl3_check_cert_and_algorithm(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428                         break;
 429
 430                 case SSL3_ST_CR_CERT_REQ_A:
 431                 case SSL3_ST_CR_CERT_REQ_B:
 432                         ret=ssl3_get_certificate_request(s);
 433                         if (ret <= 0) goto end;
 434                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_CR_SRVR_DONE_A:
 439                 case SSL3_ST_CR_SRVR_DONE_B:
 440                         ret=ssl3_get_server_done(s);
 441                         if (ret <= 0) goto end;
 442                         dtls1_stop_timer(s);
 443                         if (s->s3->tmp.cert_req)
 444                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
 445                         else
 446                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
 447                         s->init_num=0;
 448
 449 #ifndef OPENSSL_NO_SCTP
 450                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 451                             state == SSL_ST_RENEGOTIATE)
 452                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
 453                         else
 454 #endif
 455                         s->state=s->s3->tmp.next_state;
 456                         break;
 457
 458                 case SSL3_ST_CW_CERT_A:
 459                 case SSL3_ST_CW_CERT_B:
 460                 case SSL3_ST_CW_CERT_C:
 461                 case SSL3_ST_CW_CERT_D:
 462                         dtls1_start_timer(s);
 463                         ret=dtls1_send_client_certificate(s);
 464                         if (ret <= 0) goto end;
 465                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 466                         s->init_num=0;
 467                         break;
 468
 469                 case SSL3_ST_CW_KEY_EXCH_A:
 470                 case SSL3_ST_CW_KEY_EXCH_B:
 471                         dtls1_start_timer(s);
 472                         ret=dtls1_send_client_key_exchange(s);
 473                         if (ret <= 0) goto end;
 474
 475 #ifndef OPENSSL_NO_SCTP
 476                         /* Add new shared key for SCTP-Auth,
 477                          * will be ignored if no SCTP used.
 478                          */
 479                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
 480                                  DTLS1_SCTP_AUTH_LABEL);
 481
 482                         SSL_export_keying_material(s, sctpauthkey,
 483                                                    sizeof(sctpauthkey), labelbuffer,
 484                                                    sizeof(labelbuffer), NULL, 0, 0);
 485
 486                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
 487                                          sizeof(sctpauthkey), sctpauthkey);
 488 #endif
 489
 490                         /* EAY EAY EAY need to check for DH fix cert
 491                          * sent back */
 492                         /* For TLS, cert_req is set to 2, so a cert chain
 493                          * of nothing is sent, but no verify packet is sent */
 494                         if (s->s3->tmp.cert_req == 1)
 495                                 {
 496                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 497                                 }
 498                         else
 499                                 {
 500 #ifndef OPENSSL_NO_SCTP
 501                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 502                                         {
 503                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 504                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 505                                         }
 506                                 else
 507 #endif
 508                                         s->state=SSL3_ST_CW_CHANGE_A;
 509                                 s->s3->change_cipher_spec=0;
 510                                 }
 511
 512                         s->init_num=0;
 513                         break;
 514
 515                 case SSL3_ST_CW_CERT_VRFY_A:
 516                 case SSL3_ST_CW_CERT_VRFY_B:
 517                         dtls1_start_timer(s);
 518                         ret=dtls1_send_client_verify(s);
 519                         if (ret <= 0) goto end;
 520 #ifndef OPENSSL_NO_SCTP
 521                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 522                         {
 523                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
 524                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 525                         }
 526                         else
 527 #endif
 528                                 s->state=SSL3_ST_CW_CHANGE_A;
 529                         s->init_num=0;
 530                         s->s3->change_cipher_spec=0;
 531                         break;
 532
 533                 case SSL3_ST_CW_CHANGE_A:
 534                 case SSL3_ST_CW_CHANGE_B:
 535                         if (!s->hit)
 536                                 dtls1_start_timer(s);
 537                         ret=dtls1_send_change_cipher_spec(s,
 538                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 539                         if (ret <= 0) goto end;
 540
 541 #ifndef OPENSSL_NO_SCTP
 542                         /* Change to new shared key of SCTP-Auth,
 543                          * will be ignored if no SCTP used.
 544                          */
 545                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
 546 #endif
 547
 548                         s->state=SSL3_ST_CW_FINISHED_A;
 549                         s->init_num=0;
 550
 551                         s->session->cipher=s->s3->tmp.new_cipher;
 552 #ifdef OPENSSL_NO_COMP
 553                         s->session->compress_meth=0;
 554 #else
 555                         if (s->s3->tmp.new_compression == NULL)
 556                                 s->session->compress_meth=0;
 557                         else
 558                                 s->session->compress_meth=
 559                                         s->s3->tmp.new_compression->id;
 560 #endif
 561                         if (!s->method->ssl3_enc->setup_key_block(s))
 562                                 {
 563                                 ret= -1;
 564                                 goto end;
 565                                 }
 566
 567                         if (!s->method->ssl3_enc->change_cipher_state(s,
 568                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 569                                 {
 570                                 ret= -1;
 571                                 goto end;
 572                                 }
 573
 574                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 575                         break;
 576
 577                 case SSL3_ST_CW_FINISHED_A:
 578                 case SSL3_ST_CW_FINISHED_B:
 579                         if (!s->hit)
 580                                 dtls1_start_timer(s);
 581                         ret=dtls1_send_finished(s,
 582                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 583                                 s->method->ssl3_enc->client_finished_label,
 584                                 s->method->ssl3_enc->client_finished_label_len);
 585                         if (ret <= 0) goto end;
 586                         s->state=SSL3_ST_CW_FLUSH;
 587
 588                         /* clear flags */
 589                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 590                         if (s->hit)
 591                                 {
 592                                 s->s3->tmp.next_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 = s->s3->tmp.next_state;
 597                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 598                                         }
 599 #endif
 600                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 601                                         {
 602                                         s->state=SSL_ST_OK;
 603 #ifndef OPENSSL_NO_SCTP
 604                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
 605                                                 {
 606                                                         s->d1->next_state = SSL_ST_OK;
 607                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 608                                                 }
 609 #endif
 610                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 611                                         s->s3->delay_buf_pop_ret=0;
 612                                         }
 613                                 }
 614                         else
 615                                 {
 616 #ifndef OPENSSL_NO_TLSEXT
 617                                 /* Allow NewSessionTicket if ticket expected */
 618                                 if (s->tlsext_ticket_expected)
 619                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 620                                 else
 621 #endif
 622
 623                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 624                                 }
 625                         s->init_num=0;
 626                         break;
 627
 628 #ifndef OPENSSL_NO_TLSEXT
 629                 case SSL3_ST_CR_SESSION_TICKET_A:
 630                 case SSL3_ST_CR_SESSION_TICKET_B:
 631                         ret=ssl3_get_new_session_ticket(s);
 632                         if (ret <= 0) goto end;
 633                         s->state=SSL3_ST_CR_FINISHED_A;
 634                         s->init_num=0;
 635                 break;
 636
 637                 case SSL3_ST_CR_CERT_STATUS_A:
 638                 case SSL3_ST_CR_CERT_STATUS_B:
 639                         ret=ssl3_get_cert_status(s);
 640                         if (ret <= 0) goto end;
 641                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 642                         s->init_num=0;
 643                 break;
 644 #endif
 645
 646                 case SSL3_ST_CR_FINISHED_A:
 647                 case SSL3_ST_CR_FINISHED_B:
 648                         s->d1->change_cipher_spec_ok = 1;
 649                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 650                                 SSL3_ST_CR_FINISHED_B);
 651                         if (ret <= 0) goto end;
 652                         dtls1_stop_timer(s);
 653
 654                         if (s->hit)
 655                                 s->state=SSL3_ST_CW_CHANGE_A;
 656                         else
 657                                 s->state=SSL_ST_OK;
 658
 659 #ifndef OPENSSL_NO_SCTP
 660                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
 661                                 state == SSL_ST_RENEGOTIATE)
 662                                 {
 663                                 s->d1->next_state=s->state;
 664                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
 665                                 }
 666 #endif
 667
 668                         s->init_num=0;
 669                         break;
 670
 671                 case SSL3_ST_CW_FLUSH:
 672                         s->rwstate=SSL_WRITING;
 673                         if (BIO_flush(s->wbio) <= 0)
 674                                 {
 675                                 /* If the write error was fatal, stop trying */
 676                                 if (!BIO_should_retry(s->wbio))
 677                                         {
 678                                         s->rwstate=SSL_NOTHING;
 679                                         s->state=s->s3->tmp.next_state;
 680                                         }
 681
 682                                 ret= -1;
 683                                 goto end;
 684                                 }
 685                         s->rwstate=SSL_NOTHING;
 686                         s->state=s->s3->tmp.next_state;
 687                         break;
 688
 689                 case SSL_ST_OK:
 690                         /* clean a few things up */
 691                         ssl3_cleanup_key_block(s);
 692
 693 #if 0
 694                         if (s->init_buf != NULL)
 695                                 {
 696                                 BUF_MEM_free(s->init_buf);
 697                                 s->init_buf=NULL;
 698                                 }
 699 #endif
 700
 701                         /* If we are not 'joining' the last two packets,
 702                          * remove the buffering now */
 703                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 704                                 ssl_free_wbio_buffer(s);
 705                         /* else do it later in ssl3_write */
 706
 707                         s->init_num=0;
 708                         s->renegotiate=0;
 709                         s->new_session=0;
 710
 711                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 712                         if (s->hit) s->ctx->stats.sess_hit++;
 713
 714                         ret=1;
 715                         /* s->server=0; */
 716                         s->handshake_func=dtls1_connect;
 717                         s->ctx->stats.sess_connect_good++;
 718
 719                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 720
 721                         /* done with handshaking */
 722                         s->d1->handshake_read_seq  = 0;
 723                         s->d1->next_handshake_write_seq = 0;
 724                         goto end;
 725                         /* break; */
 726
 727                 default:
 728                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
 729                         ret= -1;
 730                         goto end;
 731                         /* break; */
 732                         }
 733
 734                 /* did we do anything */
 735                 if (!s->s3->tmp.reuse_message && !skip)
 736                         {
 737                         if (s->debug)
 738                                 {
 739                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 740                                         goto end;
 741                                 }
 742
 743                         if ((cb != NULL) && (s->state != state))
 744                                 {
 745                                 new_state=s->state;
 746                                 s->state=state;
 747                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 748                                 s->state=new_state;
 749                                 }
 750                         }
 751                 skip=0;
 752                 }
 753 end:
 754         s->in_handshake--;
 755
 756 #ifndef OPENSSL_NO_SCTP
 757         /* Notify SCTP BIO socket to leave handshake
 758          * mode and allow stream identifier other
 759          * than 0. Will be ignored if no SCTP is used.
 760          */
 761         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
 762 #endif
 763
 764         if (buf != NULL)
 765                 BUF_MEM_free(buf);
 766         if (cb != NULL)
 767                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 768         return(ret);
 769         }
 770
 771 int dtls1_client_hello(SSL *s)
 772         {
 773         unsigned char *buf;
 774         unsigned char *p,*d;
 775         unsigned int i,j;
 776         unsigned long Time,l;
 777         SSL_COMP *comp;
 778
 779         buf=(unsigned char *)s->init_buf->data;
 780         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 781                 {
 782                 SSL_SESSION *sess = s->session;
 783                 if ((s->session == NULL) ||
 784                         (s->session->ssl_version != s->version) ||
 785 #ifdef OPENSSL_NO_TLSEXT
 786                         !sess->session_id_length ||
 787 #else
 788                         (!sess->session_id_length && !sess->tlsext_tick) ||
 789 #endif
 790                         (s->session->not_resumable))
 791                         {
 792                         if (!s->session_creation_enabled)
 793                                 {
 794                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 795                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED);
 796                                 goto err;
 797                                 }
 798                         if (!ssl_get_new_session(s,0))
 799                                 goto err;
 800                         }
 801                 /* else use the pre-loaded session */
 802
 803                 p=s->s3->client_random;
 804
 805                 /* if client_random is initialized, reuse it, we are
 806                  * required to use same upon reply to HelloVerify */
 807                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
 808                 if (i==sizeof(s->s3->client_random))
 809                         {
 810                         Time=(unsigned long)time(NULL); /* Time */
 811                         l2n(Time,p);
 812                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 813                         }
 814
 815                 /* Do the message type and length last */
 816                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 817
 818                 *(p++)=s->version>>8;
 819                 *(p++)=s->version&0xff;
 820                 s->client_version=s->version;
 821
 822                 /* Random stuff */
 823                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 824                 p+=SSL3_RANDOM_SIZE;
 825
 826                 /* Session ID */
 827                 if (s->new_session)
 828                         i=0;
 829                 else
 830                         i=s->session->session_id_length;
 831                 *(p++)=i;
 832                 if (i != 0)
 833                         {
 834                         if (i > sizeof s->session->session_id)
 835                                 {
 836                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 837                                 goto err;
 838                                 }
 839                         memcpy(p,s->session->session_id,i);
 840                         p+=i;
 841                         }
 842
 843                 /* cookie stuff */
 844                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 845                         {
 846                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 847                         goto err;
 848                         }
 849                 *(p++) = s->d1->cookie_len;
 850                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 851                 p += s->d1->cookie_len;
 852
 853                 /* Ciphers supported */
 854                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 855                 if (i == 0)
 856                         {
 857                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 858                         goto err;
 859                         }
 860                 s2n(i,p);
 861                 p+=i;
 862
 863                 /* COMPRESSION */
 864                 if (s->ctx->comp_methods == NULL)
 865                         j=0;
 866                 else
 867                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 868                 *(p++)=1+j;
 869                 for (i=0; i<j; i++)
 870                         {
 871                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 872                         *(p++)=comp->id;
 873                         }
 874                 *(p++)=0; /* Add the NULL method */
 875
 876 #ifndef OPENSSL_NO_TLSEXT
 877                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 878                         {
 879                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 880                         goto err;
 881                         }
 882 #endif
 883
 884                 l=(p-d);
 885                 d=buf;
 886
 887                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
 888
 889                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 890                 /* number of bytes to write */
 891                 s->init_num=p-buf;
 892                 s->init_off=0;
 893
 894                 /* buffer the message to handle re-xmits */
 895                 dtls1_buffer_message(s, 0);
 896                 }
 897
 898         /* SSL3_ST_CW_CLNT_HELLO_B */
 899         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 900 err:
 901         return(-1);
 902         }
 903
 904 static int dtls1_get_hello_verify(SSL *s)
 905         {
 906         int n, al, ok = 0;
 907         unsigned char *data;
 908         unsigned int cookie_len;
 909
 910         n=s->method->ssl_get_message(s,
 911                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
 912                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
 913                 -1,
 914                 s->max_cert_list,
 915                 &ok);
 916
 917         if (!ok) return((int)n);
 918
 919         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
 920                 {
 921                 s->d1->send_cookie = 0;
 922                 s->s3->tmp.reuse_message=1;
 923                 return(1);
 924                 }
 925
 926         data = (unsigned char *)s->init_msg;
 927
 928         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
 929                 {
 930                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
 931                 s->version=(s->version&0xff00)|data[1];
 932                 al = SSL_AD_PROTOCOL_VERSION;
 933                 goto f_err;
 934                 }
 935         data+=2;
 936
 937         cookie_len = *(data++);
 938         if ( cookie_len > sizeof(s->d1->cookie))
 939                 {
 940                 al=SSL_AD_ILLEGAL_PARAMETER;
 941                 goto f_err;
 942                 }
 943
 944         memcpy(s->d1->cookie, data, cookie_len);
 945         s->d1->cookie_len = cookie_len;
 946
 947         s->d1->send_cookie = 1;
 948         return 1;
 949
 950 f_err:
 951         ssl3_send_alert(s, SSL3_AL_FATAL, al);
 952         return -1;
 953         }
 954
 955 int dtls1_send_client_key_exchange(SSL *s)
 956         {
 957         unsigned char *p,*d;
 958         int n;
 959         unsigned long alg_k;
 960 #ifndef OPENSSL_NO_RSA
 961         unsigned char *q;
 962         EVP_PKEY *pkey=NULL;
 963 #endif
 964 #ifndef OPENSSL_NO_KRB5
 965         KSSL_ERR kssl_err;
 966 #endif /* OPENSSL_NO_KRB5 */
 967 #ifndef OPENSSL_NO_ECDH
 968         EC_KEY *clnt_ecdh = NULL;
 969         const EC_POINT *srvr_ecpoint = NULL;
 970         EVP_PKEY *srvr_pub_pkey = NULL;
 971         unsigned char *encodedPoint = NULL;
 972         int encoded_pt_len = 0;
 973         BN_CTX * bn_ctx = NULL;
 974 #endif
 975
 976         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
 977                 {
 978                 d=(unsigned char *)s->init_buf->data;
 979                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 980
 981                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
 982
 983                 /* Fool emacs indentation */
 984                 if (0) {}
 985 #ifndef OPENSSL_NO_RSA
 986                 else if (alg_k & SSL_kRSA)
 987                         {
 988                         RSA *rsa;
 989                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
 990
 991                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
 992                                 rsa=s->session->sess_cert->peer_rsa_tmp;
 993                         else
 994                                 {
 995                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
 996                                 if ((pkey == NULL) ||
 997                                         (pkey->type != EVP_PKEY_RSA) ||
 998                                         (pkey->pkey.rsa == NULL))
 999                                         {
1000                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1001                                         goto err;
1002                                         }
1003                                 rsa=pkey->pkey.rsa;
1004                                 EVP_PKEY_free(pkey);
1005                                 }
1006
1007                         tmp_buf[0]=s->client_version>>8;
1008                         tmp_buf[1]=s->client_version&0xff;
1009                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1010                                         goto err;
1011
1012                         s->session->master_key_length=sizeof tmp_buf;
1013
1014                         q=p;
1015                         /* Fix buf for TLS and [incidentally] DTLS */
1016                         if (s->version > SSL3_VERSION)
1017                                 p+=2;
1018                         n=RSA_public_encrypt(sizeof tmp_buf,
1019                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1020 #ifdef PKCS1_CHECK
1021                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1022                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1023 #endif
1024                         if (n <= 0)
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1027                                 goto err;
1028                                 }
1029
1030                         /* Fix buf for TLS and [incidentally] DTLS */
1031                         if (s->version > SSL3_VERSION)
1032                                 {
1033                                 s2n(n,q);
1034                                 n+=2;
1035                                 }
1036
1037                         s->session->master_key_length=
1038                                 s->method->ssl3_enc->generate_master_secret(s,
1039                                         s->session->master_key,
1040                                         tmp_buf,sizeof tmp_buf);
1041                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1042                         }
1043 #endif
1044 #ifndef OPENSSL_NO_KRB5
1045                 else if (alg_k & SSL_kKRB5)
1046                         {
1047                         krb5_error_code krb5rc;
1048                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1049                         /*  krb5_data   krb5_ap_req;  */
1050                         krb5_data       *enc_ticket;
1051                         krb5_data       authenticator, *authp = NULL;
1052                         EVP_CIPHER_CTX  ciph_ctx;
1053                         const EVP_CIPHER *enc = NULL;
1054                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1055                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1056                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1057                                                 + EVP_MAX_IV_LENGTH];
1058                         int             padl, outl = sizeof(epms);
1059
1060                         EVP_CIPHER_CTX_init(&ciph_ctx);
1061
1062 #ifdef KSSL_DEBUG
1063                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1064                                 alg_k, SSL_kKRB5);
1065 #endif  /* KSSL_DEBUG */
1066
1067                         authp = NULL;
1068 #ifdef KRB5SENDAUTH
1069                         if (KRB5SENDAUTH)  authp = &authenticator;
1070 #endif  /* KRB5SENDAUTH */
1071
1072                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1073                                 &kssl_err);
1074                         enc = kssl_map_enc(kssl_ctx->enctype);
1075                         if (enc == NULL)
1076                             goto err;
1077 #ifdef KSSL_DEBUG
1078                         {
1079                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1080                         if (krb5rc && kssl_err.text)
1081                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1082                         }
1083 #endif  /* KSSL_DEBUG */
1084
1085                         if (krb5rc)
1086                                 {
1087                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1088                                                 SSL_AD_HANDSHAKE_FAILURE);
1089                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1090                                                 kssl_err.reason);
1091                                 goto err;
1092                                 }
1093
1094                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1095                         **  in place of RFC 2712 KerberosWrapper, as in:
1096                         **
1097                         **  Send ticket (copy to *p, set n = length)
1098                         **  n = krb5_ap_req.length;
1099                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1100                         **  if (krb5_ap_req.data)
1101                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1102                         **
1103                         **  Now using real RFC 2712 KerberosWrapper
1104                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1105                         **  Note: 2712 "opaque" types are here replaced
1106                         **  with a 2-byte length followed by the value.
1107                         **  Example:
1108                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1109                         **  Where "xx xx" = length bytes.  Shown here with
1110                         **  optional authenticator omitted.
1111                         */
1112
1113                         /*  KerberosWrapper.Ticket              */
1114                         s2n(enc_ticket->length,p);
1115                         memcpy(p, enc_ticket->data, enc_ticket->length);
1116                         p+= enc_ticket->length;
1117                         n = enc_ticket->length + 2;
1118
1119                         /*  KerberosWrapper.Authenticator       */
1120                         if (authp  &&  authp->length)
1121                                 {
1122                                 s2n(authp->length,p);
1123                                 memcpy(p, authp->data, authp->length);
1124                                 p+= authp->length;
1125                                 n+= authp->length + 2;
1126
1127                                 free(authp->data);
1128                                 authp->data = NULL;
1129                                 authp->length = 0;
1130                                 }
1131                         else
1132                                 {
1133                                 s2n(0,p);/*  null authenticator length  */
1134                                 n+=2;
1135                                 }
1136
1137                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1138                             goto err;
1139
1140                         /*  20010420 VRS.  Tried it this way; failed.
1141                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1142                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1143                         **                              kssl_ctx->length);
1144                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1145                         */
1146
1147                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1148                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1149                                 kssl_ctx->key,iv);
1150                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1151                                 sizeof tmp_buf);
1152                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1153                         outl += padl;
1154                         if (outl > (int)sizeof epms)
1155                                 {
1156                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1157                                 goto err;
1158                                 }
1159                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1160
1161                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1162                         s2n(outl,p);
1163                         memcpy(p, epms, outl);
1164                         p+=outl;
1165                         n+=outl + 2;
1166
1167                         s->session->master_key_length=
1168                                 s->method->ssl3_enc->generate_master_secret(s,
1169                                         s->session->master_key,
1170                                         tmp_buf, sizeof tmp_buf);
1171
1172                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1173                         OPENSSL_cleanse(epms, outl);
1174                         }
1175 #endif
1176 #ifndef OPENSSL_NO_DH
1177                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1178                         {
1179                         DH *dh_srvr,*dh_clnt;
1180
1181                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1182                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1183                         else
1184                                 {
1185                                 /* we get them from the cert */
1186                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1187                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1188                                 goto err;
1189                                 }
1190
1191                         /* generate a new random key */
1192                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1193                                 {
1194                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1195                                 goto err;
1196                                 }
1197                         if (!DH_generate_key(dh_clnt))
1198                                 {
1199                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1200                                 goto err;
1201                                 }
1202
1203                         /* use the 'p' output buffer for the DH key, but
1204                          * make sure to clear it out afterwards */
1205
1206                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1207
1208                         if (n <= 0)
1209                                 {
1210                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1211                                 goto err;
1212                                 }
1213
1214                         /* generate master key from the result */
1215                         s->session->master_key_length=
1216                                 s->method->ssl3_enc->generate_master_secret(s,
1217                                         s->session->master_key,p,n);
1218                         /* clean up */
1219                         memset(p,0,n);
1220
1221                         /* send off the data */
1222                         n=BN_num_bytes(dh_clnt->pub_key);
1223                         s2n(n,p);
1224                         BN_bn2bin(dh_clnt->pub_key,p);
1225                         n+=2;
1226
1227                         DH_free(dh_clnt);
1228
1229                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1230                         }
1231 #endif
1232 #ifndef OPENSSL_NO_ECDH
1233                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1234                         {
1235                         const EC_GROUP *srvr_group = NULL;
1236                         EC_KEY *tkey;
1237                         int ecdh_clnt_cert = 0;
1238                         int field_size = 0;
1239
1240                         /* Did we send out the client's
1241                          * ECDH share for use in premaster
1242                          * computation as part of client certificate?
1243                          * If so, set ecdh_clnt_cert to 1.
1244                          */
1245                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1246                                 {
1247                                 /* XXX: For now, we do not support client
1248                                  * authentication using ECDH certificates.
1249                                  * To add such support, one needs to add
1250                                  * code that checks for appropriate
1251                                  * conditions and sets ecdh_clnt_cert to 1.
1252                                  * For example, the cert have an ECC
1253                                  * key on the same curve as the server's
1254                                  * and the key should be authorized for
1255                                  * key agreement.
1256                                  *
1257                                  * One also needs to add code in ssl3_connect
1258                                  * to skip sending the certificate verify
1259                                  * message.
1260                                  *
1261                                  * if ((s->cert->key->privatekey != NULL) &&
1262                                  *     (s->cert->key->privatekey->type ==
1263                                  *      EVP_PKEY_EC) && ...)
1264                                  * ecdh_clnt_cert = 1;
1265                                  */
1266                                 }
1267
1268                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1269                                 {
1270                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1271                                 }
1272                         else
1273                                 {
1274                                 /* Get the Server Public Key from Cert */
1275                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1276                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1277                                 if ((srvr_pub_pkey == NULL) ||
1278                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1279                                     (srvr_pub_pkey->pkey.ec == NULL))
1280                                         {
1281                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1282                                             ERR_R_INTERNAL_ERROR);
1283                                         goto err;
1284                                         }
1285
1286                                 tkey = srvr_pub_pkey->pkey.ec;
1287                                 }
1288
1289                         srvr_group   = EC_KEY_get0_group(tkey);
1290                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1291
1292                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1293                                 {
1294                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1295                                     ERR_R_INTERNAL_ERROR);
1296                                 goto err;
1297                                 }
1298
1299                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
1300                                 {
1301                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1302                                 goto err;
1303                                 }
1304
1305                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1306                                 {
1307                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1308                                 goto err;
1309                                 }
1310                         if (ecdh_clnt_cert)
1311                                 {
1312                                 /* Reuse key info from our certificate
1313                                  * We only need our private key to perform
1314                                  * the ECDH computation.
1315                                  */
1316                                 const BIGNUM *priv_key;
1317                                 tkey = s->cert->key->privatekey->pkey.ec;
1318                                 priv_key = EC_KEY_get0_private_key(tkey);
1319                                 if (priv_key == NULL)
1320                                         {
1321                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1322                                         goto err;
1323                                         }
1324                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1325                                         {
1326                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1327                                         goto err;
1328                                         }
1329                                 }
1330                         else
1331                                 {
1332                                 /* Generate a new ECDH key pair */
1333                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1334                                         {
1335                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1336                                         goto err;
1337                                         }
1338                                 }
1339
1340                         /* use the 'p' output buffer for the ECDH key, but
1341                          * make sure to clear it out afterwards
1342                          */
1343
1344                         field_size = EC_GROUP_get_degree(srvr_group);
1345                         if (field_size <= 0)
1346                                 {
1347                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1348                                        ERR_R_ECDH_LIB);
1349                                 goto err;
1350                                 }
1351                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1352                         if (n <= 0)
1353                                 {
1354                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1355                                        ERR_R_ECDH_LIB);
1356                                 goto err;
1357                                 }
1358
1359                         /* generate master key from the result */
1360                         s->session->master_key_length = s->method->ssl3_enc \
1361                             -> generate_master_secret(s,
1362                                 s->session->master_key,
1363                                 p, n);
1364
1365                         memset(p, 0, n); /* clean up */
1366
1367                         if (ecdh_clnt_cert)
1368                                 {
1369                                 /* Send empty client key exch message */
1370                                 n = 0;
1371                                 }
1372                         else
1373                                 {
1374                                 /* First check the size of encoding and
1375                                  * allocate memory accordingly.
1376                                  */
1377                                 encoded_pt_len =
1378                                     EC_POINT_point2oct(srvr_group,
1379                                         EC_KEY_get0_public_key(clnt_ecdh),
1380                                         POINT_CONVERSION_UNCOMPRESSED,
1381                                         NULL, 0, NULL);
1382
1383                                 encodedPoint = (unsigned char *)
1384                                     OPENSSL_malloc(encoded_pt_len *
1385                                         sizeof(unsigned char));
1386                                 bn_ctx = BN_CTX_new();
1387                                 if ((encodedPoint == NULL) ||
1388                                     (bn_ctx == NULL))
1389                                         {
1390                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1391                                         goto err;
1392                                         }
1393
1394                                 /* Encode the public key */
1395                                 n = EC_POINT_point2oct(srvr_group,
1396                                     EC_KEY_get0_public_key(clnt_ecdh),
1397                                     POINT_CONVERSION_UNCOMPRESSED,
1398                                     encodedPoint, encoded_pt_len, bn_ctx);
1399
1400                                 *p = n; /* length of encoded point */
1401                                 /* Encoded point will be copied here */
1402                                 p += 1;
1403                                 /* copy the point */
1404                                 memcpy((unsigned char *)p, encodedPoint, n);
1405                                 /* increment n to account for length field */
1406                                 n += 1;
1407                                 }
1408
1409                         /* Free allocated memory */
1410                         BN_CTX_free(bn_ctx);
1411                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1412                         if (clnt_ecdh != NULL)
1413                                  EC_KEY_free(clnt_ecdh);
1414                         EVP_PKEY_free(srvr_pub_pkey);
1415                         }
1416 #endif /* !OPENSSL_NO_ECDH */
1417
1418 #ifndef OPENSSL_NO_PSK
1419                 else if (alg_k & SSL_kPSK)
1420                         {
1421                         char identity[PSK_MAX_IDENTITY_LEN];
1422                         unsigned char *t = NULL;
1423                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1424                         unsigned int pre_ms_len = 0, psk_len = 0;
1425                         int psk_err = 1;
1426
1427                         n = 0;
1428                         if (s->psk_client_callback == NULL)
1429                                 {
1430                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1431                                         SSL_R_PSK_NO_CLIENT_CB);
1432                                 goto err;
1433                                 }
1434
1435                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1436                                 identity, PSK_MAX_IDENTITY_LEN,
1437                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1438                         if (psk_len > PSK_MAX_PSK_LEN)
1439                                 {
1440                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1441                                         ERR_R_INTERNAL_ERROR);
1442                                 goto psk_err;
1443                                 }
1444                         else if (psk_len == 0)
1445                                 {
1446                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1447                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1448                                 goto psk_err;
1449                                 }
1450
1451                         /* create PSK pre_master_secret */
1452                         pre_ms_len = 2+psk_len+2+psk_len;
1453                         t = psk_or_pre_ms;
1454                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1455                         s2n(psk_len, t);
1456                         memset(t, 0, psk_len);
1457                         t+=psk_len;
1458                         s2n(psk_len, t);
1459
1460                         if (s->session->psk_identity_hint != NULL)
1461                                 OPENSSL_free(s->session->psk_identity_hint);
1462                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1463                         if (s->ctx->psk_identity_hint != NULL &&
1464                                 s->session->psk_identity_hint == NULL)
1465                                 {
1466                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1467                                         ERR_R_MALLOC_FAILURE);
1468                                 goto psk_err;
1469                                 }
1470
1471                         if (s->session->psk_identity != NULL)
1472                                 OPENSSL_free(s->session->psk_identity);
1473                         s->session->psk_identity = BUF_strdup(identity);
1474                         if (s->session->psk_identity == NULL)
1475                                 {
1476                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1477                                         ERR_R_MALLOC_FAILURE);
1478                                 goto psk_err;
1479                                 }
1480
1481                         s->session->master_key_length =
1482                                 s->method->ssl3_enc->generate_master_secret(s,
1483                                         s->session->master_key,
1484                                         psk_or_pre_ms, pre_ms_len);
1485                         n = strlen(identity);
1486                         s2n(n, p);
1487                         memcpy(p, identity, n);
1488                         n+=2;
1489                         psk_err = 0;
1490                 psk_err:
1491                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1492                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1493                         if (psk_err != 0)
1494                                 {
1495                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1496                                 goto err;
1497                                 }
1498                         }
1499 #endif
1500                 else
1501                         {
1502                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1503                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1504                         goto err;
1505                         }
1506
1507                 d = dtls1_set_message_header(s, d,
1508                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1509                 /*
1510                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1511                  l2n3(n,d);
1512                  l2n(s->d1->handshake_write_seq,d);
1513                  s->d1->handshake_write_seq++;
1514                 */
1515
1516                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1517                 /* number of bytes to write */
1518                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1519                 s->init_off=0;
1520
1521                 /* buffer the message to handle re-xmits */
1522                 dtls1_buffer_message(s, 0);
1523                 }
1524
1525         /* SSL3_ST_CW_KEY_EXCH_B */
1526         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1527 err:
1528 #ifndef OPENSSL_NO_ECDH
1529         BN_CTX_free(bn_ctx);
1530         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1531         if (clnt_ecdh != NULL)
1532                 EC_KEY_free(clnt_ecdh);
1533         EVP_PKEY_free(srvr_pub_pkey);
1534 #endif
1535         return(-1);
1536         }
1537
1538 int dtls1_send_client_verify(SSL *s)
1539         {
1540         unsigned char *p,*d;
1541         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1542         EVP_PKEY *pkey;
1543 #ifndef OPENSSL_NO_RSA
1544         unsigned u=0;
1545 #endif
1546         unsigned long n;
1547 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1548         int j;
1549 #endif
1550
1551         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1552                 {
1553                 d=(unsigned char *)s->init_buf->data;
1554                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1555                 pkey=s->cert->key->privatekey;
1556
1557                 s->method->ssl3_enc->cert_verify_mac(s,
1558                 NID_sha1,
1559                         &(data[MD5_DIGEST_LENGTH]));
1560
1561 #ifndef OPENSSL_NO_RSA
1562                 if (pkey->type == EVP_PKEY_RSA)
1563                         {
1564                         s->method->ssl3_enc->cert_verify_mac(s,
1565                                 NID_md5,
1566                                 &(data[0]));
1567                         if (RSA_sign(NID_md5_sha1, data,
1568                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1569                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1570                                 {
1571                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1572                                 goto err;
1573                                 }
1574                         s2n(u,p);
1575                         n=u+2;
1576                         }
1577                 else
1578 #endif
1579 #ifndef OPENSSL_NO_DSA
1580                         if (pkey->type == EVP_PKEY_DSA)
1581                         {
1582                         if (!DSA_sign(pkey->save_type,
1583                                 &(data[MD5_DIGEST_LENGTH]),
1584                                 SHA_DIGEST_LENGTH,&(p[2]),
1585                                 (unsigned int *)&j,pkey->pkey.dsa))
1586                                 {
1587                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1588                                 goto err;
1589                                 }
1590                         s2n(j,p);
1591                         n=j+2;
1592                         }
1593                 else
1594 #endif
1595 #ifndef OPENSSL_NO_ECDSA
1596                         if (pkey->type == EVP_PKEY_EC)
1597                         {
1598                         if (!ECDSA_sign(pkey->save_type,
1599                                 &(data[MD5_DIGEST_LENGTH]),
1600                                 SHA_DIGEST_LENGTH,&(p[2]),
1601                                 (unsigned int *)&j,pkey->pkey.ec))
1602                                 {
1603                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1604                                     ERR_R_ECDSA_LIB);
1605                                 goto err;
1606                                 }
1607                         s2n(j,p);
1608                         n=j+2;
1609                         }
1610                 else
1611 #endif
1612                         {
1613                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1614                         goto err;
1615                         }
1616
1617                 d = dtls1_set_message_header(s, d,
1618                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1619
1620                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1621                 s->init_off=0;
1622
1623                 /* buffer the message to handle re-xmits */
1624                 dtls1_buffer_message(s, 0);
1625
1626                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1627                 }
1628
1629         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1630         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1631 err:
1632         return(-1);
1633         }
1634
1635 int dtls1_send_client_certificate(SSL *s)
1636         {
1637         X509 *x509=NULL;
1638         EVP_PKEY *pkey=NULL;
1639         int i;
1640         unsigned long l;
1641
1642         if (s->state == SSL3_ST_CW_CERT_A)
1643                 {
1644                 if ((s->cert == NULL) ||
1645                         (s->cert->key->x509 == NULL) ||
1646                         (s->cert->key->privatekey == NULL))
1647                         s->state=SSL3_ST_CW_CERT_B;
1648                 else
1649                         s->state=SSL3_ST_CW_CERT_C;
1650                 }
1651
1652         /* We need to get a client cert */
1653         if (s->state == SSL3_ST_CW_CERT_B)
1654                 {
1655                 /* If we get an error, we need to
1656                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1657                  * We then get retied later */
1658                 i=0;
1659                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1660                 if (i < 0)
1661                         {
1662                         s->rwstate=SSL_X509_LOOKUP;
1663                         return(-1);
1664                         }
1665                 s->rwstate=SSL_NOTHING;
1666                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1667                         {
1668                         s->state=SSL3_ST_CW_CERT_B;
1669                         if (    !SSL_use_certificate(s,x509) ||
1670                                 !SSL_use_PrivateKey(s,pkey))
1671                                 i=0;
1672                         }
1673                 else if (i == 1)
1674                         {
1675                         i=0;
1676                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1677                         }
1678
1679                 if (x509 != NULL) X509_free(x509);
1680                 if (pkey != NULL) EVP_PKEY_free(pkey);
1681                 if (i == 0)
1682                         {
1683                         if (s->version == SSL3_VERSION)
1684                                 {
1685                                 s->s3->tmp.cert_req=0;
1686                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1687                                 return(1);
1688                                 }
1689                         else
1690                                 {
1691                                 s->s3->tmp.cert_req=2;
1692                                 }
1693                         }
1694
1695                 /* Ok, we have a cert */
1696                 s->state=SSL3_ST_CW_CERT_C;
1697                 }
1698
1699         if (s->state == SSL3_ST_CW_CERT_C)
1700                 {
1701                 s->state=SSL3_ST_CW_CERT_D;
1702                 l=dtls1_output_cert_chain(s,
1703                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1704                 s->init_num=(int)l;
1705                 s->init_off=0;
1706
1707                 /* set header called by dtls1_output_cert_chain() */
1708
1709                 /* buffer the message to handle re-xmits */
1710                 dtls1_buffer_message(s, 0);
1711                 }
1712         /* SSL3_ST_CW_CERT_D */
1713         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1714         }
1715
1716