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                         break;
 240
 241                 case SSL3_ST_SW_HELLO_REQ_A:
 242                 case SSL3_ST_SW_HELLO_REQ_B:
 243
 244                         s->shutdown=0;
 245                         dtls1_start_timer(s);
 246                         ret=dtls1_send_hello_request(s);
 247                         if (ret <= 0) goto end;
 248                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 249                         s->state=SSL3_ST_SW_FLUSH;
 250                         s->init_num=0;
 251
 252                         ssl3_init_finished_mac(s);
 253                         break;
 254
 255                 case SSL3_ST_SW_HELLO_REQ_C:
 256                         s->state=SSL_ST_OK;
 257                         break;
 258
 259                 case SSL3_ST_SR_CLNT_HELLO_A:
 260                 case SSL3_ST_SR_CLNT_HELLO_B:
 261                 case SSL3_ST_SR_CLNT_HELLO_C:
 262
 263                         s->shutdown=0;
 264                         ret=ssl3_get_client_hello(s);
 265                         if (ret <= 0) goto end;
 266                         dtls1_stop_timer(s);
 267                         s->new_session = 2;
 268
 269                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 270                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 271                         else
 272                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 273
 274                         s->init_num=0;
 275
 276                         /* If we're just listening, stop here */
 277                         if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 278                                 {
 279                                 ret = 2;
 280                                 s->d1->listen = 0;
 281                                 goto end;
 282                                 }
 283
 284                         break;
 285
 286                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 287                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 288
 289                         dtls1_start_timer(s);
 290                         ret = dtls1_send_hello_verify_request(s);
 291                         if ( ret <= 0) goto end;
 292                         s->state=SSL3_ST_SW_FLUSH;
 293                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 294
 295                         /* HelloVerifyRequests resets Finished MAC */
 296                         if (s->client_version != DTLS1_BAD_VER)
 297                                 ssl3_init_finished_mac(s);
 298                         break;
 299
 300                 case SSL3_ST_SW_SRVR_HELLO_A:
 301                 case SSL3_ST_SW_SRVR_HELLO_B:
 302                         dtls1_start_timer(s);
 303                         ret=dtls1_send_server_hello(s);
 304                         if (ret <= 0) goto end;
 305
 306                         if (s->hit)
 307                                 s->state=SSL3_ST_SW_CHANGE_A;
 308                         else
 309                                 s->state=SSL3_ST_SW_CERT_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_SW_CERT_A:
 314                 case SSL3_ST_SW_CERT_B:
 315                         /* Check if it is anon DH */
 316                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 317                                 {
 318                                 dtls1_start_timer(s);
 319                                 ret=dtls1_send_server_certificate(s);
 320                                 if (ret <= 0) goto end;
 321                                 }
 322                         else
 323                                 skip=1;
 324                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 325                         s->init_num=0;
 326                         break;
 327
 328                 case SSL3_ST_SW_KEY_EXCH_A:
 329                 case SSL3_ST_SW_KEY_EXCH_B:
 330                         l=s->s3->tmp.new_cipher->algorithms;
 331
 332                         /* clear this, it may get reset by
 333                          * send_server_key_exchange */
 334                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 335 #ifndef OPENSSL_NO_KRB5
 336                                 && !(l & SSL_KRB5)
 337 #endif /* OPENSSL_NO_KRB5 */
 338                                 )
 339                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 340                                  * even when forbidden by protocol specs
 341                                  * (handshake may fail as clients are not required to
 342                                  * be able to handle this) */
 343                                 s->s3->tmp.use_rsa_tmp=1;
 344                         else
 345                                 s->s3->tmp.use_rsa_tmp=0;
 346
 347                         /* only send if a DH key exchange, fortezza or
 348                          * RSA but we have a sign only certificate */
 349                         if (s->s3->tmp.use_rsa_tmp
 350                             || (l & (SSL_DH|SSL_kFZA))
 351                             || ((l & SSL_kRSA)
 352                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 353                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 354                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 355                                         )
 356                                     )
 357                                 )
 358                             )
 359                                 {
 360                                 dtls1_start_timer(s);
 361                                 ret=dtls1_send_server_key_exchange(s);
 362                                 if (ret <= 0) goto end;
 363                                 }
 364                         else
 365                                 skip=1;
 366
 367                         s->state=SSL3_ST_SW_CERT_REQ_A;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_SW_CERT_REQ_A:
 372                 case SSL3_ST_SW_CERT_REQ_B:
 373                         if (/* don't request cert unless asked for it: */
 374                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 375                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 376                                  * don't request cert during re-negotiation: */
 377                                 ((s->session->peer != NULL) &&
 378                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 379                                 /* never request cert in anonymous ciphersuites
 380                                  * (see section "Certificate request" in SSL 3 drafts
 381                                  * and in RFC 2246): */
 382                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 383                                  /* ... except when the application insists on verification
 384                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 385                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 386                                  /* never request cert in Kerberos ciphersuites */
 387                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 388                                 {
 389                                 /* no cert request */
 390                                 skip=1;
 391                                 s->s3->tmp.cert_request=0;
 392                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 393                                 }
 394                         else
 395                                 {
 396                                 s->s3->tmp.cert_request=1;
 397                                 dtls1_start_timer(s);
 398                                 ret=dtls1_send_certificate_request(s);
 399                                 if (ret <= 0) goto end;
 400 #ifndef NETSCAPE_HANG_BUG
 401                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 402 #else
 403                                 s->state=SSL3_ST_SW_FLUSH;
 404                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 405 #endif
 406                                 s->init_num=0;
 407                                 }
 408                         break;
 409
 410                 case SSL3_ST_SW_SRVR_DONE_A:
 411                 case SSL3_ST_SW_SRVR_DONE_B:
 412                         dtls1_start_timer(s);
 413                         ret=dtls1_send_server_done(s);
 414                         if (ret <= 0) goto end;
 415                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 416                         s->state=SSL3_ST_SW_FLUSH;
 417                         s->init_num=0;
 418                         break;
 419
 420                 case SSL3_ST_SW_FLUSH:
 421                         /* number of bytes to be flushed */
 422                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 423                         if (num1 > 0)
 424                                 {
 425                                 s->rwstate=SSL_WRITING;
 426                                 num1=BIO_flush(s->wbio);
 427                                 if (num1 <= 0) { ret= -1; goto end; }
 428                                 s->rwstate=SSL_NOTHING;
 429                                 }
 430
 431                         s->state=s->s3->tmp.next_state;
 432                         break;
 433
 434                 case SSL3_ST_SR_CERT_A:
 435                 case SSL3_ST_SR_CERT_B:
 436                         /* Check for second client hello (MS SGC) */
 437                         ret = ssl3_check_client_hello(s);
 438                         if (ret <= 0)
 439                                 goto end;
 440                         dtls1_stop_timer(s);
 441                         if (ret == 2)
 442                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 443                         else {
 444                                 /* could be sent for a DH cert, even if we
 445                                  * have not asked for it :-) */
 446                                 ret=ssl3_get_client_certificate(s);
 447                                 if (ret <= 0) goto end;
 448                                 dtls1_stop_timer(s);
 449                                 s->init_num=0;
 450                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 451                         }
 452                         break;
 453
 454                 case SSL3_ST_SR_KEY_EXCH_A:
 455                 case SSL3_ST_SR_KEY_EXCH_B:
 456                         ret=ssl3_get_client_key_exchange(s);
 457                         if (ret <= 0) goto end;
 458                         dtls1_stop_timer(s);
 459                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 460                         s->init_num=0;
 461
 462                         /* We need to get hashes here so if there is
 463                          * a client cert, it can be verified */
 464                         s->method->ssl3_enc->cert_verify_mac(s,
 465                                 &(s->s3->finish_dgst1),
 466                                 &(s->s3->tmp.cert_verify_md[0]));
 467                         s->method->ssl3_enc->cert_verify_mac(s,
 468                                 &(s->s3->finish_dgst2),
 469                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 470
 471                         break;
 472
 473                 case SSL3_ST_SR_CERT_VRFY_A:
 474                 case SSL3_ST_SR_CERT_VRFY_B:
 475
 476                         s->d1->change_cipher_spec_ok = 1;
 477                         /* we should decide if we expected this one */
 478                         ret=ssl3_get_cert_verify(s);
 479                         if (ret <= 0) goto end;
 480                         dtls1_stop_timer(s);
 481
 482                         s->state=SSL3_ST_SR_FINISHED_A;
 483                         s->init_num=0;
 484                         break;
 485
 486                 case SSL3_ST_SR_FINISHED_A:
 487                 case SSL3_ST_SR_FINISHED_B:
 488                         s->d1->change_cipher_spec_ok = 1;
 489                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 490                                 SSL3_ST_SR_FINISHED_B);
 491                         if (ret <= 0) goto end;
 492                         dtls1_stop_timer(s);
 493                         if (s->hit)
 494                                 s->state=SSL_ST_OK;
 495                         else
 496                                 s->state=SSL3_ST_SW_CHANGE_A;
 497                         s->init_num=0;
 498                         break;
 499
 500                 case SSL3_ST_SW_CHANGE_A:
 501                 case SSL3_ST_SW_CHANGE_B:
 502
 503                         s->session->cipher=s->s3->tmp.new_cipher;
 504                         if (!s->method->ssl3_enc->setup_key_block(s))
 505                                 { ret= -1; goto end; }
 506
 507                         ret=dtls1_send_change_cipher_spec(s,
 508                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 509
 510                         if (ret <= 0) goto end;
 511                         s->state=SSL3_ST_SW_FINISHED_A;
 512                         s->init_num=0;
 513
 514                         if (!s->method->ssl3_enc->change_cipher_state(s,
 515                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 516                                 {
 517                                 ret= -1;
 518                                 goto end;
 519                                 }
 520
 521                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 522                         break;
 523
 524                 case SSL3_ST_SW_FINISHED_A:
 525                 case SSL3_ST_SW_FINISHED_B:
 526                         ret=dtls1_send_finished(s,
 527                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 528                                 s->method->ssl3_enc->server_finished_label,
 529                                 s->method->ssl3_enc->server_finished_label_len);
 530                         if (ret <= 0) goto end;
 531                         s->state=SSL3_ST_SW_FLUSH;
 532                         if (s->hit)
 533                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 534                         else
 535                                 s->s3->tmp.next_state=SSL_ST_OK;
 536                         s->init_num=0;
 537                         break;
 538
 539                 case SSL_ST_OK:
 540                         /* clean a few things up */
 541                         ssl3_cleanup_key_block(s);
 542
 543 #if 0
 544                         BUF_MEM_free(s->init_buf);
 545                         s->init_buf=NULL;
 546 #endif
 547
 548                         /* remove buffering on output */
 549                         ssl_free_wbio_buffer(s);
 550
 551                         s->init_num=0;
 552
 553                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 554                                 {
 555                                 /* actually not necessarily a 'new' session unless
 556                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 557
 558                                 s->new_session=0;
 559
 560                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 561
 562                                 s->ctx->stats.sess_accept_good++;
 563                                 /* s->server=1; */
 564                                 s->handshake_func=dtls1_accept;
 565
 566                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 567                                 }
 568
 569                         ret = 1;
 570
 571                         /* done handshaking, next message is client hello */
 572                         s->d1->handshake_read_seq = 0;
 573                         /* next message is server hello */
 574                         s->d1->handshake_write_seq = 0;
 575                         s->d1->next_handshake_write_seq = 0;
 576                         goto end;
 577                         /* break; */
 578
 579                 default:
 580                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 581                         ret= -1;
 582                         goto end;
 583                         /* break; */
 584                         }
 585
 586                 if (!s->s3->tmp.reuse_message && !skip)
 587                         {
 588                         if (s->debug)
 589                                 {
 590                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 591                                         goto end;
 592                                 }
 593
 594
 595                         if ((cb != NULL) && (s->state != state))
 596                                 {
 597                                 new_state=s->state;
 598                                 s->state=state;
 599                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 600                                 s->state=new_state;
 601                                 }
 602                         }
 603                 skip=0;
 604                 }
 605 end:
 606         /* BIO_flush(s->wbio); */
 607
 608         s->in_handshake--;
 609         if (cb != NULL)
 610                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 611         return(ret);
 612         }
 613
 614 int dtls1_send_hello_request(SSL *s)
 615         {
 616         unsigned char *p;
 617
 618         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 619                 {
 620                 p=(unsigned char *)s->init_buf->data;
 621                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 622
 623                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 624                 /* number of bytes to write */
 625                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 626                 s->init_off=0;
 627
 628                 /* no need to buffer this message, since there are no retransmit
 629                  * requests for it */
 630                 }
 631
 632         /* SSL3_ST_SW_HELLO_REQ_B */
 633         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 634         }
 635
 636 int dtls1_send_hello_verify_request(SSL *s)
 637         {
 638         unsigned int msg_len;
 639         unsigned char *msg, *buf, *p;
 640
 641         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 642                 {
 643                 buf = (unsigned char *)s->init_buf->data;
 644
 645                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 646                 if (s->client_version == DTLS1_BAD_VER)
 647                         *(p++) = DTLS1_BAD_VER>>8,
 648                         *(p++) = DTLS1_BAD_VER&0xff;
 649                 else
 650                         *(p++) = s->version >> 8,
 651                         *(p++) = s->version & 0xFF;
 652
 653                 if (s->ctx->app_gen_cookie_cb == NULL ||
 654                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 655                          &(s->d1->cookie_len)) == 0)
 656                         {
 657                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 658                         return 0;
 659                         }
 660
 661                 *(p++) = (unsigned char) s->d1->cookie_len;
 662                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 663                 p += s->d1->cookie_len;
 664                 msg_len = p - msg;
 665
 666                 dtls1_set_message_header(s, buf,
 667                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 668
 669                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 670                 /* number of bytes to write */
 671                 s->init_num=p-buf;
 672                 s->init_off=0;
 673
 674                 /* buffer the message to handle re-xmits */
 675                 dtls1_buffer_message(s, 0);
 676                 }
 677
 678         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 679         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 680         }
 681
 682 int dtls1_send_server_hello(SSL *s)
 683         {
 684         unsigned char *buf;
 685         unsigned char *p,*d;
 686         int i;
 687         unsigned int sl;
 688         unsigned long l,Time;
 689
 690         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 691                 {
 692                 buf=(unsigned char *)s->init_buf->data;
 693                 p=s->s3->server_random;
 694                 Time=(unsigned long)time(NULL);                 /* Time */
 695                 l2n(Time,p);
 696                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 697                 /* Do the message type and length last */
 698                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 699
 700                 if (s->client_version == DTLS1_BAD_VER)
 701                         *(p++)=DTLS1_BAD_VER>>8,
 702                         *(p++)=DTLS1_BAD_VER&0xff;
 703                 else
 704                         *(p++)=s->version>>8,
 705                         *(p++)=s->version&0xff;
 706
 707                 /* Random stuff */
 708                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 709                 p+=SSL3_RANDOM_SIZE;
 710
 711                 /* now in theory we have 3 options to sending back the
 712                  * session id.  If it is a re-use, we send back the
 713                  * old session-id, if it is a new session, we send
 714                  * back the new session-id or we send back a 0 length
 715                  * session-id if we want it to be single use.
 716                  * Currently I will not implement the '0' length session-id
 717                  * 12-Jan-98 - I'll now support the '0' length stuff.
 718                  */
 719                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 720                         s->session->session_id_length=0;
 721
 722                 sl=s->session->session_id_length;
 723                 if (sl > sizeof s->session->session_id)
 724                         {
 725                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 726                         return -1;
 727                         }
 728                 *(p++)=sl;
 729                 memcpy(p,s->session->session_id,sl);
 730                 p+=sl;
 731
 732                 /* put the cipher */
 733                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 734                 p+=i;
 735
 736                 /* put the compression method */
 737 #ifdef OPENSSL_NO_COMP
 738                 *(p++)=0;
 739 #else
 740                 if (s->s3->tmp.new_compression == NULL)
 741                         *(p++)=0;
 742                 else
 743                         *(p++)=s->s3->tmp.new_compression->id;
 744 #endif
 745
 746                 /* do the header */
 747                 l=(p-d);
 748                 d=buf;
 749
 750                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 751
 752                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 753                 /* number of bytes to write */
 754                 s->init_num=p-buf;
 755                 s->init_off=0;
 756
 757                 /* buffer the message to handle re-xmits */
 758                 dtls1_buffer_message(s, 0);
 759                 }
 760
 761         /* SSL3_ST_SW_SRVR_HELLO_B */
 762         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 763         }
 764
 765 int dtls1_send_server_done(SSL *s)
 766         {
 767         unsigned char *p;
 768
 769         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 770                 {
 771                 p=(unsigned char *)s->init_buf->data;
 772
 773                 /* do the header */
 774                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 775
 776                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 777                 /* number of bytes to write */
 778                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 779                 s->init_off=0;
 780
 781                 /* buffer the message to handle re-xmits */
 782                 dtls1_buffer_message(s, 0);
 783                 }
 784
 785         /* SSL3_ST_SW_SRVR_DONE_B */
 786         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 787         }
 788
 789 int dtls1_send_server_key_exchange(SSL *s)
 790         {
 791 #ifndef OPENSSL_NO_RSA
 792         unsigned char *q;
 793         int j,num;
 794         RSA *rsa;
 795         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 796         unsigned int u;
 797 #endif
 798 #ifndef OPENSSL_NO_DH
 799         DH *dh=NULL,*dhp;
 800 #endif
 801         EVP_PKEY *pkey;
 802         unsigned char *p,*d;
 803         int al,i;
 804         unsigned long type;
 805         int n;
 806         CERT *cert;
 807         BIGNUM *r[4];
 808         int nr[4],kn;
 809         BUF_MEM *buf;
 810         EVP_MD_CTX md_ctx;
 811
 812         EVP_MD_CTX_init(&md_ctx);
 813         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 814                 {
 815                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 816                 cert=s->cert;
 817
 818                 buf=s->init_buf;
 819
 820                 r[0]=r[1]=r[2]=r[3]=NULL;
 821                 n=0;
 822 #ifndef OPENSSL_NO_RSA
 823                 if (type & SSL_kRSA)
 824                         {
 825                         rsa=cert->rsa_tmp;
 826                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 827                                 {
 828                                 rsa=s->cert->rsa_tmp_cb(s,
 829                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 830                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 831                                 if(rsa == NULL)
 832                                 {
 833                                         al=SSL_AD_HANDSHAKE_FAILURE;
 834                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 835                                         goto f_err;
 836                                 }
 837                                 RSA_up_ref(rsa);
 838                                 cert->rsa_tmp=rsa;
 839                                 }
 840                         if (rsa == NULL)
 841                                 {
 842                                 al=SSL_AD_HANDSHAKE_FAILURE;
 843                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 844                                 goto f_err;
 845                                 }
 846                         r[0]=rsa->n;
 847                         r[1]=rsa->e;
 848                         s->s3->tmp.use_rsa_tmp=1;
 849                         }
 850                 else
 851 #endif
 852 #ifndef OPENSSL_NO_DH
 853                         if (type & SSL_kEDH)
 854                         {
 855                         dhp=cert->dh_tmp;
 856                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 857                                 dhp=s->cert->dh_tmp_cb(s,
 858                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 859                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 860                         if (dhp == NULL)
 861                                 {
 862                                 al=SSL_AD_HANDSHAKE_FAILURE;
 863                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 864                                 goto f_err;
 865                                 }
 866
 867                         if (s->s3->tmp.dh != NULL)
 868                                 {
 869                                 DH_free(dh);
 870                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 871                                 goto err;
 872                                 }
 873
 874                         if ((dh=DHparams_dup(dhp)) == NULL)
 875                                 {
 876                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 877                                 goto err;
 878                                 }
 879
 880                         s->s3->tmp.dh=dh;
 881                         if ((dhp->pub_key == NULL ||
 882                              dhp->priv_key == NULL ||
 883                              (s->options & SSL_OP_SINGLE_DH_USE)))
 884                                 {
 885                                 if(!DH_generate_key(dh))
 886                                     {
 887                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 888                                            ERR_R_DH_LIB);
 889                                     goto err;
 890                                     }
 891                                 }
 892                         else
 893                                 {
 894                                 dh->pub_key=BN_dup(dhp->pub_key);
 895                                 dh->priv_key=BN_dup(dhp->priv_key);
 896                                 if ((dh->pub_key == NULL) ||
 897                                         (dh->priv_key == NULL))
 898                                         {
 899                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 900                                         goto err;
 901                                         }
 902                                 }
 903                         r[0]=dh->p;
 904                         r[1]=dh->g;
 905                         r[2]=dh->pub_key;
 906                         }
 907                 else
 908 #endif
 909                         {
 910                         al=SSL_AD_HANDSHAKE_FAILURE;
 911                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 912                         goto f_err;
 913                         }
 914                 for (i=0; r[i] != NULL; i++)
 915                         {
 916                         nr[i]=BN_num_bytes(r[i]);
 917                         n+=2+nr[i];
 918                         }
 919
 920                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 921                         {
 922                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 923                                 == NULL)
 924                                 {
 925                                 al=SSL_AD_DECODE_ERROR;
 926                                 goto f_err;
 927                                 }
 928                         kn=EVP_PKEY_size(pkey);
 929                         }
 930                 else
 931                         {
 932                         pkey=NULL;
 933                         kn=0;
 934                         }
 935
 936                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 937                         {
 938                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 939                         goto err;
 940                         }
 941                 d=(unsigned char *)s->init_buf->data;
 942                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 943
 944                 for (i=0; r[i] != NULL; i++)
 945                         {
 946                         s2n(nr[i],p);
 947                         BN_bn2bin(r[i],p);
 948                         p+=nr[i];
 949                         }
 950
 951                 /* not anonymous */
 952                 if (pkey != NULL)
 953                         {
 954                         /* n is the length of the params, they start at
 955                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 956                          * at the end. */
 957 #ifndef OPENSSL_NO_RSA
 958                         if (pkey->type == EVP_PKEY_RSA)
 959                                 {
 960                                 q=md_buf;
 961                                 j=0;
 962                                 for (num=2; num > 0; num--)
 963                                         {
 964                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 965                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 966                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 967                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 968                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 969                                         EVP_DigestFinal_ex(&md_ctx,q,
 970                                                 (unsigned int *)&i);
 971                                         q+=i;
 972                                         j+=i;
 973                                         }
 974                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 975                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 976                                         {
 977                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 978                                         goto err;
 979                                         }
 980                                 s2n(u,p);
 981                                 n+=u+2;
 982                                 }
 983                         else
 984 #endif
 985 #if !defined(OPENSSL_NO_DSA)
 986                                 if (pkey->type == EVP_PKEY_DSA)
 987                                 {
 988                                 /* lets do DSS */
 989                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 990                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 991                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 992                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 993                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 994                                         (unsigned int *)&i,pkey))
 995                                         {
 996                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 997                                         goto err;
 998                                         }
 999                                 s2n(i,p);
1000                                 n+=i+2;
1001                                 }
1002                         else
1003 #endif
1004                                 {
1005                                 /* Is this error check actually needed? */
1006                                 al=SSL_AD_HANDSHAKE_FAILURE;
1007                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1008                                 goto f_err;
1009                                 }
1010                         }
1011
1012                 d = dtls1_set_message_header(s, d,
1013                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1014
1015                 /* we should now have things packed up, so lets send
1016                  * it off */
1017                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1018                 s->init_off=0;
1019
1020                 /* buffer the message to handle re-xmits */
1021                 dtls1_buffer_message(s, 0);
1022                 }
1023
1024         s->state = SSL3_ST_SW_KEY_EXCH_B;
1025         EVP_MD_CTX_cleanup(&md_ctx);
1026         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1027 f_err:
1028         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1029 err:
1030         EVP_MD_CTX_cleanup(&md_ctx);
1031         return(-1);
1032         }
1033
1034 int dtls1_send_certificate_request(SSL *s)
1035         {
1036         unsigned char *p,*d;
1037         int i,j,nl,off,n;
1038         STACK_OF(X509_NAME) *sk=NULL;
1039         X509_NAME *name;
1040         BUF_MEM *buf;
1041         unsigned int msg_len;
1042
1043         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1044                 {
1045                 buf=s->init_buf;
1046
1047                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1048
1049                 /* get the list of acceptable cert types */
1050                 p++;
1051                 n=ssl3_get_req_cert_type(s,p);
1052                 d[0]=n;
1053                 p+=n;
1054                 n++;
1055
1056                 off=n;
1057                 p+=2;
1058                 n+=2;
1059
1060                 sk=SSL_get_client_CA_list(s);
1061                 nl=0;
1062                 if (sk != NULL)
1063                         {
1064                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1065                                 {
1066                                 name=sk_X509_NAME_value(sk,i);
1067                                 j=i2d_X509_NAME(name,NULL);
1068                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1069                                         {
1070                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1071                                         goto err;
1072                                         }
1073                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1074                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1075                                         {
1076                                         s2n(j,p);
1077                                         i2d_X509_NAME(name,&p);
1078                                         n+=2+j;
1079                                         nl+=2+j;
1080                                         }
1081                                 else
1082                                         {
1083                                         d=p;
1084                                         i2d_X509_NAME(name,&p);
1085                                         j-=2; s2n(j,d); j+=2;
1086                                         n+=j;
1087                                         nl+=j;
1088                                         }
1089                                 }
1090                         }
1091                 /* else no CA names */
1092                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1093                 s2n(nl,p);
1094
1095                 d=(unsigned char *)buf->data;
1096                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1097                 l2n3(n,d);
1098                 s2n(s->d1->handshake_write_seq,d);
1099                 s->d1->handshake_write_seq++;
1100
1101                 /* we should now have things packed up, so lets send
1102                  * it off */
1103
1104                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1105                 s->init_off=0;
1106 #ifdef NETSCAPE_HANG_BUG
1107 /* XXX: what to do about this? */
1108                 p=(unsigned char *)s->init_buf->data + s->init_num;
1109
1110                 /* do the header */
1111                 *(p++)=SSL3_MT_SERVER_DONE;
1112                 *(p++)=0;
1113                 *(p++)=0;
1114                 *(p++)=0;
1115                 s->init_num += 4;
1116 #endif
1117
1118                 /* XDTLS:  set message header ? */
1119                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1120                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1121                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1122
1123                 /* buffer the message to handle re-xmits */
1124                 dtls1_buffer_message(s, 0);
1125
1126                 s->state = SSL3_ST_SW_CERT_REQ_B;
1127                 }
1128
1129         /* SSL3_ST_SW_CERT_REQ_B */
1130         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1131 err:
1132         return(-1);
1133         }
1134
1135 int dtls1_send_server_certificate(SSL *s)
1136         {
1137         unsigned long l;
1138         X509 *x;
1139
1140         if (s->state == SSL3_ST_SW_CERT_A)
1141                 {
1142                 x=ssl_get_server_send_cert(s);
1143                 if (x == NULL &&
1144                         /* VRS: allow null cert if auth == KRB5 */
1145                         (s->s3->tmp.new_cipher->algorithms
1146                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1147                         != (SSL_aKRB5|SSL_kKRB5))
1148                         {
1149                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1150                         return(0);
1151                         }
1152
1153                 l=dtls1_output_cert_chain(s,x);
1154                 s->state=SSL3_ST_SW_CERT_B;
1155                 s->init_num=(int)l;
1156                 s->init_off=0;
1157
1158                 /* buffer the message to handle re-xmits */
1159                 dtls1_buffer_message(s, 0);
1160                 }
1161
1162         /* SSL3_ST_SW_CERT_B */
1163         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1164         }