crypto/openssl-0.9/ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_server_method(int ver);
 129 static int dtls1_send_hello_verify_request(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_server_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_server_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 140                         dtls1_accept,
 141                         ssl_undefined_function,
 142                         dtls1_get_server_method)
 143
 144 int dtls1_accept(SSL *s)
 145         {
 146         BUF_MEM *buf;
 147         unsigned long l,Time=(unsigned long)time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         long num1;
 150         int ret= -1;
 151         int new_state,state,skip=0;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         /* init things to blank */
 163         s->in_handshake++;
 164         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 165
 166         if (s->cert == NULL)
 167                 {
 168                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 169                 return(-1);
 170                 }
 171
 172         for (;;)
 173                 {
 174                 state=s->state;
 175
 176                 switch (s->state)
 177                         {
 178                 case SSL_ST_RENEGOTIATE:
 179                         s->new_session=1;
 180                         /* s->state=SSL_ST_ACCEPT; */
 181
 182                 case SSL_ST_BEFORE:
 183                 case SSL_ST_ACCEPT:
 184                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 185                 case SSL_ST_OK|SSL_ST_ACCEPT:
 186
 187                         s->server=1;
 188                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 189
 190                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 191                                 {
 192                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 193                                 return -1;
 194                                 }
 195                         s->type=SSL_ST_ACCEPT;
 196
 197                         if (s->init_buf == NULL)
 198                                 {
 199                                 if ((buf=BUF_MEM_new()) == NULL)
 200                                         {
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 205                                         {
 206                                         ret= -1;
 207                                         goto end;
 208                                         }
 209                                 s->init_buf=buf;
 210                                 }
 211
 212                         if (!ssl3_setup_buffers(s))
 213                                 {
 214                                 ret= -1;
 215                                 goto end;
 216                                 }
 217
 218                         s->init_num=0;
 219
 220                         if (s->state != SSL_ST_RENEGOTIATE)
 221                                 {
 222                                 /* Ok, we now need to push on a buffering BIO so that
 223                                  * the output is sent in a way that TCP likes :-)
 224                                  */
 225                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 226
 227                                 ssl3_init_finished_mac(s);
 228                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 229                                 s->ctx->stats.sess_accept++;
 230                                 }
 231                         else
 232                                 {
 233                                 /* s->state == SSL_ST_RENEGOTIATE,
 234                                  * we will just send a HelloRequest */
 235                                 s->ctx->stats.sess_accept_renegotiate++;
 236                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 237                                 }
 238
 239             if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 240                 s->d1->send_cookie = 1;
 241             else
 242                 s->d1->send_cookie = 0;
 243
 244                         break;
 245
 246                 case SSL3_ST_SW_HELLO_REQ_A:
 247                 case SSL3_ST_SW_HELLO_REQ_B:
 248
 249                         s->shutdown=0;
 250                         ret=dtls1_send_hello_request(s);
 251                         if (ret <= 0) goto end;
 252                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 253                         s->state=SSL3_ST_SW_FLUSH;
 254                         s->init_num=0;
 255
 256                         ssl3_init_finished_mac(s);
 257                         break;
 258
 259                 case SSL3_ST_SW_HELLO_REQ_C:
 260                         s->state=SSL_ST_OK;
 261                         break;
 262
 263                 case SSL3_ST_SR_CLNT_HELLO_A:
 264                 case SSL3_ST_SR_CLNT_HELLO_B:
 265                 case SSL3_ST_SR_CLNT_HELLO_C:
 266
 267                         s->shutdown=0;
 268                         ret=ssl3_get_client_hello(s);
 269                         if (ret <= 0) goto end;
 270                         s->new_session = 2;
 271
 272                         if ( s->d1->send_cookie)
 273                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 274                         else
 275                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 276
 277                         s->init_num=0;
 278                         break;
 279
 280                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 281                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 282
 283                         ret = dtls1_send_hello_verify_request(s);
 284                         if ( ret <= 0) goto end;
 285                         s->d1->send_cookie = 0;
 286                         s->state=SSL3_ST_SW_FLUSH;
 287                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 288
 289                         /* HelloVerifyRequests resets Finished MAC */
 290                         if (s->client_version != DTLS1_BAD_VER)
 291                                 ssl3_init_finished_mac(s);
 292                         break;
 293
 294                 case SSL3_ST_SW_SRVR_HELLO_A:
 295                 case SSL3_ST_SW_SRVR_HELLO_B:
 296                         ret=dtls1_send_server_hello(s);
 297                         if (ret <= 0) goto end;
 298
 299                         if (s->hit)
 300                                 s->state=SSL3_ST_SW_CHANGE_A;
 301                         else
 302                                 s->state=SSL3_ST_SW_CERT_A;
 303                         s->init_num=0;
 304                         break;
 305
 306                 case SSL3_ST_SW_CERT_A:
 307                 case SSL3_ST_SW_CERT_B:
 308                         /* Check if it is anon DH */
 309                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 310                                 {
 311                                 ret=dtls1_send_server_certificate(s);
 312                                 if (ret <= 0) goto end;
 313                                 }
 314                         else
 315                                 skip=1;
 316                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 317                         s->init_num=0;
 318                         break;
 319
 320                 case SSL3_ST_SW_KEY_EXCH_A:
 321                 case SSL3_ST_SW_KEY_EXCH_B:
 322                         l=s->s3->tmp.new_cipher->algorithms;
 323
 324                         /* clear this, it may get reset by
 325                          * send_server_key_exchange */
 326                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 327 #ifndef OPENSSL_NO_KRB5
 328                                 && !(l & SSL_KRB5)
 329 #endif /* OPENSSL_NO_KRB5 */
 330                                 )
 331                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 332                                  * even when forbidden by protocol specs
 333                                  * (handshake may fail as clients are not required to
 334                                  * be able to handle this) */
 335                                 s->s3->tmp.use_rsa_tmp=1;
 336                         else
 337                                 s->s3->tmp.use_rsa_tmp=0;
 338
 339                         /* only send if a DH key exchange, fortezza or
 340                          * RSA but we have a sign only certificate */
 341                         if (s->s3->tmp.use_rsa_tmp
 342                             || (l & (SSL_DH|SSL_kFZA))
 343                             || ((l & SSL_kRSA)
 344                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 345                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 346                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 347                                         )
 348                                     )
 349                                 )
 350                             )
 351                                 {
 352                                 ret=dtls1_send_server_key_exchange(s);
 353                                 if (ret <= 0) goto end;
 354                                 }
 355                         else
 356                                 skip=1;
 357
 358                         s->state=SSL3_ST_SW_CERT_REQ_A;
 359                         s->init_num=0;
 360                         break;
 361
 362                 case SSL3_ST_SW_CERT_REQ_A:
 363                 case SSL3_ST_SW_CERT_REQ_B:
 364                         if (/* don't request cert unless asked for it: */
 365                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 366                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 367                                  * don't request cert during re-negotiation: */
 368                                 ((s->session->peer != NULL) &&
 369                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 370                                 /* never request cert in anonymous ciphersuites
 371                                  * (see section "Certificate request" in SSL 3 drafts
 372                                  * and in RFC 2246): */
 373                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 374                                  /* ... except when the application insists on verification
 375                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 376                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 377                                  /* never request cert in Kerberos ciphersuites */
 378                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 379                                 {
 380                                 /* no cert request */
 381                                 skip=1;
 382                                 s->s3->tmp.cert_request=0;
 383                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 384                                 }
 385                         else
 386                                 {
 387                                 s->s3->tmp.cert_request=1;
 388                                 ret=dtls1_send_certificate_request(s);
 389                                 if (ret <= 0) goto end;
 390 #ifndef NETSCAPE_HANG_BUG
 391                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 392 #else
 393                                 s->state=SSL3_ST_SW_FLUSH;
 394                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 395 #endif
 396                                 s->init_num=0;
 397                                 }
 398                         break;
 399
 400                 case SSL3_ST_SW_SRVR_DONE_A:
 401                 case SSL3_ST_SW_SRVR_DONE_B:
 402                         ret=dtls1_send_server_done(s);
 403                         if (ret <= 0) goto end;
 404                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 405                         s->state=SSL3_ST_SW_FLUSH;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_SW_FLUSH:
 410                         /* number of bytes to be flushed */
 411                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 412                         if (num1 > 0)
 413                                 {
 414                                 s->rwstate=SSL_WRITING;
 415                                 num1=BIO_flush(s->wbio);
 416                                 if (num1 <= 0) { ret= -1; goto end; }
 417                                 s->rwstate=SSL_NOTHING;
 418                                 }
 419
 420                         s->state=s->s3->tmp.next_state;
 421                         break;
 422
 423                 case SSL3_ST_SR_CERT_A:
 424                 case SSL3_ST_SR_CERT_B:
 425                         /* Check for second client hello (MS SGC) */
 426                         ret = ssl3_check_client_hello(s);
 427                         if (ret <= 0)
 428                                 goto end;
 429                         if (ret == 2)
 430                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 431                         else {
 432                                 /* could be sent for a DH cert, even if we
 433                                  * have not asked for it :-) */
 434                                 ret=ssl3_get_client_certificate(s);
 435                                 if (ret <= 0) goto end;
 436                                 s->init_num=0;
 437                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 438                         }
 439                         break;
 440
 441                 case SSL3_ST_SR_KEY_EXCH_A:
 442                 case SSL3_ST_SR_KEY_EXCH_B:
 443                         ret=ssl3_get_client_key_exchange(s);
 444                         if (ret <= 0) goto end;
 445                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 446                         s->init_num=0;
 447
 448                         /* We need to get hashes here so if there is
 449                          * a client cert, it can be verified */
 450                         s->method->ssl3_enc->cert_verify_mac(s,
 451                                 &(s->s3->finish_dgst1),
 452                                 &(s->s3->tmp.cert_verify_md[0]));
 453                         s->method->ssl3_enc->cert_verify_mac(s,
 454                                 &(s->s3->finish_dgst2),
 455                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 456
 457                         break;
 458
 459                 case SSL3_ST_SR_CERT_VRFY_A:
 460                 case SSL3_ST_SR_CERT_VRFY_B:
 461
 462                         /* we should decide if we expected this one */
 463                         ret=ssl3_get_cert_verify(s);
 464                         if (ret <= 0) goto end;
 465
 466                         s->state=SSL3_ST_SR_FINISHED_A;
 467                         s->init_num=0;
 468                         break;
 469
 470                 case SSL3_ST_SR_FINISHED_A:
 471                 case SSL3_ST_SR_FINISHED_B:
 472                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 473                                 SSL3_ST_SR_FINISHED_B);
 474                         if (ret <= 0) goto end;
 475                         if (s->hit)
 476                                 s->state=SSL_ST_OK;
 477                         else
 478                                 s->state=SSL3_ST_SW_CHANGE_A;
 479                         s->init_num=0;
 480                         break;
 481
 482                 case SSL3_ST_SW_CHANGE_A:
 483                 case SSL3_ST_SW_CHANGE_B:
 484
 485                         s->session->cipher=s->s3->tmp.new_cipher;
 486                         if (!s->method->ssl3_enc->setup_key_block(s))
 487                                 { ret= -1; goto end; }
 488
 489                         ret=dtls1_send_change_cipher_spec(s,
 490                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 491
 492                         if (ret <= 0) goto end;
 493                         s->state=SSL3_ST_SW_FINISHED_A;
 494                         s->init_num=0;
 495
 496                         if (!s->method->ssl3_enc->change_cipher_state(s,
 497                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 498                                 {
 499                                 ret= -1;
 500                                 goto end;
 501                                 }
 502
 503                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 504                         break;
 505
 506                 case SSL3_ST_SW_FINISHED_A:
 507                 case SSL3_ST_SW_FINISHED_B:
 508                         ret=dtls1_send_finished(s,
 509                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 510                                 s->method->ssl3_enc->server_finished_label,
 511                                 s->method->ssl3_enc->server_finished_label_len);
 512                         if (ret <= 0) goto end;
 513                         s->state=SSL3_ST_SW_FLUSH;
 514                         if (s->hit)
 515                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 516                         else
 517                                 s->s3->tmp.next_state=SSL_ST_OK;
 518                         s->init_num=0;
 519                         break;
 520
 521                 case SSL_ST_OK:
 522                         /* clean a few things up */
 523                         ssl3_cleanup_key_block(s);
 524
 525 #if 0
 526                         BUF_MEM_free(s->init_buf);
 527                         s->init_buf=NULL;
 528 #endif
 529
 530                         /* remove buffering on output */
 531                         ssl_free_wbio_buffer(s);
 532
 533                         s->init_num=0;
 534
 535                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 536                                 {
 537                                 /* actually not necessarily a 'new' session unless
 538                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 539
 540                                 s->new_session=0;
 541
 542                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 543
 544                                 s->ctx->stats.sess_accept_good++;
 545                                 /* s->server=1; */
 546                                 s->handshake_func=dtls1_accept;
 547
 548                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 549                                 }
 550
 551                         ret = 1;
 552
 553                         /* done handshaking, next message is client hello */
 554                         s->d1->handshake_read_seq = 0;
 555                         /* next message is server hello */
 556                         s->d1->handshake_write_seq = 0;
 557                         goto end;
 558                         /* break; */
 559
 560                 default:
 561                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 562                         ret= -1;
 563                         goto end;
 564                         /* break; */
 565                         }
 566
 567                 if (!s->s3->tmp.reuse_message && !skip)
 568                         {
 569                         if (s->debug)
 570                                 {
 571                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 572                                         goto end;
 573                                 }
 574
 575
 576                         if ((cb != NULL) && (s->state != state))
 577                                 {
 578                                 new_state=s->state;
 579                                 s->state=state;
 580                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 581                                 s->state=new_state;
 582                                 }
 583                         }
 584                 skip=0;
 585                 }
 586 end:
 587         /* BIO_flush(s->wbio); */
 588
 589         s->in_handshake--;
 590         if (cb != NULL)
 591                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 592         return(ret);
 593         }
 594
 595 int dtls1_send_hello_request(SSL *s)
 596         {
 597         unsigned char *p;
 598
 599         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 600                 {
 601                 p=(unsigned char *)s->init_buf->data;
 602                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 603
 604                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 605                 /* number of bytes to write */
 606                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 607                 s->init_off=0;
 608
 609                 /* no need to buffer this message, since there are no retransmit
 610                  * requests for it */
 611                 }
 612
 613         /* SSL3_ST_SW_HELLO_REQ_B */
 614         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 615         }
 616
 617 int dtls1_send_hello_verify_request(SSL *s)
 618         {
 619         unsigned int msg_len;
 620         unsigned char *msg, *buf, *p;
 621
 622         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 623                 {
 624                 buf = (unsigned char *)s->init_buf->data;
 625
 626                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 627                 if (s->client_version == DTLS1_BAD_VER)
 628                         *(p++) = DTLS1_BAD_VER>>8,
 629                         *(p++) = DTLS1_BAD_VER&0xff;
 630                 else
 631                         *(p++) = s->version >> 8,
 632                         *(p++) = s->version & 0xFF;
 633
 634                 if (s->ctx->app_gen_cookie_cb != NULL &&
 635                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 636                     &(s->d1->cookie_len)) == 0)
 637                         {
 638                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 639                         return 0;
 640                         }
 641                 /* else the cookie is assumed to have
 642                  * been initialized by the application */
 643
 644                 *(p++) = (unsigned char) s->d1->cookie_len;
 645                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 646                 p += s->d1->cookie_len;
 647                 msg_len = p - msg;
 648
 649                 dtls1_set_message_header(s, buf,
 650                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 651
 652                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 653                 /* number of bytes to write */
 654                 s->init_num=p-buf;
 655                 s->init_off=0;
 656
 657                 /* buffer the message to handle re-xmits */
 658                 dtls1_buffer_message(s, 0);
 659                 }
 660
 661         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 662         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 663         }
 664
 665 int dtls1_send_server_hello(SSL *s)
 666         {
 667         unsigned char *buf;
 668         unsigned char *p,*d;
 669         int i;
 670         unsigned int sl;
 671         unsigned long l,Time;
 672
 673         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 674                 {
 675                 buf=(unsigned char *)s->init_buf->data;
 676                 p=s->s3->server_random;
 677                 Time=(unsigned long)time(NULL);                 /* Time */
 678                 l2n(Time,p);
 679                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 680                 /* Do the message type and length last */
 681                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 682
 683                 if (s->client_version == DTLS1_BAD_VER)
 684                         *(p++)=DTLS1_BAD_VER>>8,
 685                         *(p++)=DTLS1_BAD_VER&0xff;
 686                 else
 687                         *(p++)=s->version>>8,
 688                         *(p++)=s->version&0xff;
 689
 690                 /* Random stuff */
 691                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 692                 p+=SSL3_RANDOM_SIZE;
 693
 694                 /* now in theory we have 3 options to sending back the
 695                  * session id.  If it is a re-use, we send back the
 696                  * old session-id, if it is a new session, we send
 697                  * back the new session-id or we send back a 0 length
 698                  * session-id if we want it to be single use.
 699                  * Currently I will not implement the '0' length session-id
 700                  * 12-Jan-98 - I'll now support the '0' length stuff.
 701                  */
 702                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 703                         s->session->session_id_length=0;
 704
 705                 sl=s->session->session_id_length;
 706                 if (sl > sizeof s->session->session_id)
 707                         {
 708                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 709                         return -1;
 710                         }
 711                 *(p++)=sl;
 712                 memcpy(p,s->session->session_id,sl);
 713                 p+=sl;
 714
 715                 /* put the cipher */
 716                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 717                 p+=i;
 718
 719                 /* put the compression method */
 720 #ifdef OPENSSL_NO_COMP
 721                 *(p++)=0;
 722 #else
 723                 if (s->s3->tmp.new_compression == NULL)
 724                         *(p++)=0;
 725                 else
 726                         *(p++)=s->s3->tmp.new_compression->id;
 727 #endif
 728
 729                 /* do the header */
 730                 l=(p-d);
 731                 d=buf;
 732
 733                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 734
 735                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 736                 /* number of bytes to write */
 737                 s->init_num=p-buf;
 738                 s->init_off=0;
 739
 740                 /* buffer the message to handle re-xmits */
 741                 dtls1_buffer_message(s, 0);
 742                 }
 743
 744         /* SSL3_ST_SW_SRVR_HELLO_B */
 745         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 746         }
 747
 748 int dtls1_send_server_done(SSL *s)
 749         {
 750         unsigned char *p;
 751
 752         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 753                 {
 754                 p=(unsigned char *)s->init_buf->data;
 755
 756                 /* do the header */
 757                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 758
 759                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 760                 /* number of bytes to write */
 761                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 762                 s->init_off=0;
 763
 764                 /* buffer the message to handle re-xmits */
 765                 dtls1_buffer_message(s, 0);
 766                 }
 767
 768         /* SSL3_ST_SW_SRVR_DONE_B */
 769         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 770         }
 771
 772 int dtls1_send_server_key_exchange(SSL *s)
 773         {
 774 #ifndef OPENSSL_NO_RSA
 775         unsigned char *q;
 776         int j,num;
 777         RSA *rsa;
 778         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 779         unsigned int u;
 780 #endif
 781 #ifndef OPENSSL_NO_DH
 782         DH *dh=NULL,*dhp;
 783 #endif
 784         EVP_PKEY *pkey;
 785         unsigned char *p,*d;
 786         int al,i;
 787         unsigned long type;
 788         int n;
 789         CERT *cert;
 790         BIGNUM *r[4];
 791         int nr[4],kn;
 792         BUF_MEM *buf;
 793         EVP_MD_CTX md_ctx;
 794
 795         EVP_MD_CTX_init(&md_ctx);
 796         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 797                 {
 798                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 799                 cert=s->cert;
 800
 801                 buf=s->init_buf;
 802
 803                 r[0]=r[1]=r[2]=r[3]=NULL;
 804                 n=0;
 805 #ifndef OPENSSL_NO_RSA
 806                 if (type & SSL_kRSA)
 807                         {
 808                         rsa=cert->rsa_tmp;
 809                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 810                                 {
 811                                 rsa=s->cert->rsa_tmp_cb(s,
 812                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 813                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 814                                 if(rsa == NULL)
 815                                 {
 816                                         al=SSL_AD_HANDSHAKE_FAILURE;
 817                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 818                                         goto f_err;
 819                                 }
 820                                 RSA_up_ref(rsa);
 821                                 cert->rsa_tmp=rsa;
 822                                 }
 823                         if (rsa == NULL)
 824                                 {
 825                                 al=SSL_AD_HANDSHAKE_FAILURE;
 826                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 827                                 goto f_err;
 828                                 }
 829                         r[0]=rsa->n;
 830                         r[1]=rsa->e;
 831                         s->s3->tmp.use_rsa_tmp=1;
 832                         }
 833                 else
 834 #endif
 835 #ifndef OPENSSL_NO_DH
 836                         if (type & SSL_kEDH)
 837                         {
 838                         dhp=cert->dh_tmp;
 839                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 840                                 dhp=s->cert->dh_tmp_cb(s,
 841                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 842                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 843                         if (dhp == NULL)
 844                                 {
 845                                 al=SSL_AD_HANDSHAKE_FAILURE;
 846                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 847                                 goto f_err;
 848                                 }
 849
 850                         if (s->s3->tmp.dh != NULL)
 851                                 {
 852                                 DH_free(dh);
 853                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 854                                 goto err;
 855                                 }
 856
 857                         if ((dh=DHparams_dup(dhp)) == NULL)
 858                                 {
 859                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 860                                 goto err;
 861                                 }
 862
 863                         s->s3->tmp.dh=dh;
 864                         if ((dhp->pub_key == NULL ||
 865                              dhp->priv_key == NULL ||
 866                              (s->options & SSL_OP_SINGLE_DH_USE)))
 867                                 {
 868                                 if(!DH_generate_key(dh))
 869                                     {
 870                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 871                                            ERR_R_DH_LIB);
 872                                     goto err;
 873                                     }
 874                                 }
 875                         else
 876                                 {
 877                                 dh->pub_key=BN_dup(dhp->pub_key);
 878                                 dh->priv_key=BN_dup(dhp->priv_key);
 879                                 if ((dh->pub_key == NULL) ||
 880                                         (dh->priv_key == NULL))
 881                                         {
 882                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 883                                         goto err;
 884                                         }
 885                                 }
 886                         r[0]=dh->p;
 887                         r[1]=dh->g;
 888                         r[2]=dh->pub_key;
 889                         }
 890                 else
 891 #endif
 892                         {
 893                         al=SSL_AD_HANDSHAKE_FAILURE;
 894                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 895                         goto f_err;
 896                         }
 897                 for (i=0; r[i] != NULL; i++)
 898                         {
 899                         nr[i]=BN_num_bytes(r[i]);
 900                         n+=2+nr[i];
 901                         }
 902
 903                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 904                         {
 905                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 906                                 == NULL)
 907                                 {
 908                                 al=SSL_AD_DECODE_ERROR;
 909                                 goto f_err;
 910                                 }
 911                         kn=EVP_PKEY_size(pkey);
 912                         }
 913                 else
 914                         {
 915                         pkey=NULL;
 916                         kn=0;
 917                         }
 918
 919                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 920                         {
 921                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 922                         goto err;
 923                         }
 924                 d=(unsigned char *)s->init_buf->data;
 925                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 926
 927                 for (i=0; r[i] != NULL; i++)
 928                         {
 929                         s2n(nr[i],p);
 930                         BN_bn2bin(r[i],p);
 931                         p+=nr[i];
 932                         }
 933
 934                 /* not anonymous */
 935                 if (pkey != NULL)
 936                         {
 937                         /* n is the length of the params, they start at
 938                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 939                          * at the end. */
 940 #ifndef OPENSSL_NO_RSA
 941                         if (pkey->type == EVP_PKEY_RSA)
 942                                 {
 943                                 q=md_buf;
 944                                 j=0;
 945                                 for (num=2; num > 0; num--)
 946                                         {
 947                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 948                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 949                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 950                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 951                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 952                                         EVP_DigestFinal_ex(&md_ctx,q,
 953                                                 (unsigned int *)&i);
 954                                         q+=i;
 955                                         j+=i;
 956                                         }
 957                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 958                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 959                                         {
 960                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 961                                         goto err;
 962                                         }
 963                                 s2n(u,p);
 964                                 n+=u+2;
 965                                 }
 966                         else
 967 #endif
 968 #if !defined(OPENSSL_NO_DSA)
 969                                 if (pkey->type == EVP_PKEY_DSA)
 970                                 {
 971                                 /* lets do DSS */
 972                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 973                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 974                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 975                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 976                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 977                                         (unsigned int *)&i,pkey))
 978                                         {
 979                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 980                                         goto err;
 981                                         }
 982                                 s2n(i,p);
 983                                 n+=i+2;
 984                                 }
 985                         else
 986 #endif
 987                                 {
 988                                 /* Is this error check actually needed? */
 989                                 al=SSL_AD_HANDSHAKE_FAILURE;
 990                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 991                                 goto f_err;
 992                                 }
 993                         }
 994
 995                 d = dtls1_set_message_header(s, d,
 996                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 997
 998                 /* we should now have things packed up, so lets send
 999                  * it off */
1000                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1001                 s->init_off=0;
1002
1003                 /* buffer the message to handle re-xmits */
1004                 dtls1_buffer_message(s, 0);
1005                 }
1006
1007         s->state = SSL3_ST_SW_KEY_EXCH_B;
1008         EVP_MD_CTX_cleanup(&md_ctx);
1009         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1010 f_err:
1011         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1012 err:
1013         EVP_MD_CTX_cleanup(&md_ctx);
1014         return(-1);
1015         }
1016
1017 int dtls1_send_certificate_request(SSL *s)
1018         {
1019         unsigned char *p,*d;
1020         int i,j,nl,off,n;
1021         STACK_OF(X509_NAME) *sk=NULL;
1022         X509_NAME *name;
1023         BUF_MEM *buf;
1024         unsigned int msg_len;
1025
1026         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1027                 {
1028                 buf=s->init_buf;
1029
1030                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1031
1032                 /* get the list of acceptable cert types */
1033                 p++;
1034                 n=ssl3_get_req_cert_type(s,p);
1035                 d[0]=n;
1036                 p+=n;
1037                 n++;
1038
1039                 off=n;
1040                 p+=2;
1041                 n+=2;
1042
1043                 sk=SSL_get_client_CA_list(s);
1044                 nl=0;
1045                 if (sk != NULL)
1046                         {
1047                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1048                                 {
1049                                 name=sk_X509_NAME_value(sk,i);
1050                                 j=i2d_X509_NAME(name,NULL);
1051                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1052                                         {
1053                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1054                                         goto err;
1055                                         }
1056                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1057                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1058                                         {
1059                                         s2n(j,p);
1060                                         i2d_X509_NAME(name,&p);
1061                                         n+=2+j;
1062                                         nl+=2+j;
1063                                         }
1064                                 else
1065                                         {
1066                                         d=p;
1067                                         i2d_X509_NAME(name,&p);
1068                                         j-=2; s2n(j,d); j+=2;
1069                                         n+=j;
1070                                         nl+=j;
1071                                         }
1072                                 }
1073                         }
1074                 /* else no CA names */
1075                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1076                 s2n(nl,p);
1077
1078                 d=(unsigned char *)buf->data;
1079                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1080                 l2n3(n,d);
1081                 s2n(s->d1->handshake_write_seq,d);
1082                 s->d1->handshake_write_seq++;
1083
1084                 /* we should now have things packed up, so lets send
1085                  * it off */
1086
1087                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1088                 s->init_off=0;
1089 #ifdef NETSCAPE_HANG_BUG
1090 /* XXX: what to do about this? */
1091                 p=(unsigned char *)s->init_buf->data + s->init_num;
1092
1093                 /* do the header */
1094                 *(p++)=SSL3_MT_SERVER_DONE;
1095                 *(p++)=0;
1096                 *(p++)=0;
1097                 *(p++)=0;
1098                 s->init_num += 4;
1099 #endif
1100
1101                 /* XDTLS:  set message header ? */
1102                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1103                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1104                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1105
1106                 /* buffer the message to handle re-xmits */
1107                 dtls1_buffer_message(s, 0);
1108
1109                 s->state = SSL3_ST_SW_CERT_REQ_B;
1110                 }
1111
1112         /* SSL3_ST_SW_CERT_REQ_B */
1113         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1114 err:
1115         return(-1);
1116         }
1117
1118 int dtls1_send_server_certificate(SSL *s)
1119         {
1120         unsigned long l;
1121         X509 *x;
1122
1123         if (s->state == SSL3_ST_SW_CERT_A)
1124                 {
1125                 x=ssl_get_server_send_cert(s);
1126                 if (x == NULL &&
1127                         /* VRS: allow null cert if auth == KRB5 */
1128                         (s->s3->tmp.new_cipher->algorithms
1129                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1130                         != (SSL_aKRB5|SSL_kKRB5))
1131                         {
1132                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1133                         return(0);
1134                         }
1135
1136                 l=dtls1_output_cert_chain(s,x);
1137                 s->state=SSL3_ST_SW_CERT_B;
1138                 s->init_num=(int)l;
1139                 s->init_off=0;
1140
1141                 /* buffer the message to handle re-xmits */
1142                 dtls1_buffer_message(s, 0);
1143                 }
1144
1145         /* SSL3_ST_SW_CERT_B */
1146         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1147         }