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                 if (s->s3->tmp.new_cipher == NULL)
 734                         return -1;
 735                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 736                 p+=i;
 737
 738                 /* put the compression method */
 739 #ifdef OPENSSL_NO_COMP
 740                 *(p++)=0;
 741 #else
 742                 if (s->s3->tmp.new_compression == NULL)
 743                         *(p++)=0;
 744                 else
 745                         *(p++)=s->s3->tmp.new_compression->id;
 746 #endif
 747
 748 #ifndef OPENSSL_NO_TLSEXT
 749                 if ((p = ssl_add_serverhello_dtlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 750                         {
 751                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 752                         return -1;
 753                         }
 754 #endif
 755
 756                 /* do the header */
 757                 l=(p-d);
 758                 d=buf;
 759
 760                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 761
 762                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 763                 /* number of bytes to write */
 764                 s->init_num=p-buf;
 765                 s->init_off=0;
 766
 767                 /* buffer the message to handle re-xmits */
 768                 dtls1_buffer_message(s, 0);
 769                 }
 770
 771         /* SSL3_ST_SW_SRVR_HELLO_B */
 772         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 773         }
 774
 775 int dtls1_send_server_done(SSL *s)
 776         {
 777         unsigned char *p;
 778
 779         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 780                 {
 781                 p=(unsigned char *)s->init_buf->data;
 782
 783                 /* do the header */
 784                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 785
 786                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 787                 /* number of bytes to write */
 788                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 789                 s->init_off=0;
 790
 791                 /* buffer the message to handle re-xmits */
 792                 dtls1_buffer_message(s, 0);
 793                 }
 794
 795         /* SSL3_ST_SW_SRVR_DONE_B */
 796         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 797         }
 798
 799 int dtls1_send_server_key_exchange(SSL *s)
 800         {
 801 #ifndef OPENSSL_NO_RSA
 802         unsigned char *q;
 803         int j,num;
 804         RSA *rsa;
 805         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 806         unsigned int u;
 807 #endif
 808 #ifndef OPENSSL_NO_DH
 809         DH *dh=NULL,*dhp;
 810 #endif
 811         EVP_PKEY *pkey;
 812         unsigned char *p,*d;
 813         int al,i;
 814         unsigned long type;
 815         int n;
 816         CERT *cert;
 817         BIGNUM *r[4];
 818         int nr[4],kn;
 819         BUF_MEM *buf;
 820         EVP_MD_CTX md_ctx;
 821
 822         EVP_MD_CTX_init(&md_ctx);
 823         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 824                 {
 825                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 826                 cert=s->cert;
 827
 828                 buf=s->init_buf;
 829
 830                 r[0]=r[1]=r[2]=r[3]=NULL;
 831                 n=0;
 832 #ifndef OPENSSL_NO_RSA
 833                 if (type & SSL_kRSA)
 834                         {
 835                         rsa=cert->rsa_tmp;
 836                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 837                                 {
 838                                 rsa=s->cert->rsa_tmp_cb(s,
 839                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 840                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 841                                 if(rsa == NULL)
 842                                 {
 843                                         al=SSL_AD_HANDSHAKE_FAILURE;
 844                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 845                                         goto f_err;
 846                                 }
 847                                 RSA_up_ref(rsa);
 848                                 cert->rsa_tmp=rsa;
 849                                 }
 850                         if (rsa == NULL)
 851                                 {
 852                                 al=SSL_AD_HANDSHAKE_FAILURE;
 853                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 854                                 goto f_err;
 855                                 }
 856                         r[0]=rsa->n;
 857                         r[1]=rsa->e;
 858                         s->s3->tmp.use_rsa_tmp=1;
 859                         }
 860                 else
 861 #endif
 862 #ifndef OPENSSL_NO_DH
 863                         if (type & SSL_kEDH)
 864                         {
 865                         dhp=cert->dh_tmp;
 866                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 867                                 dhp=s->cert->dh_tmp_cb(s,
 868                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 869                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 870                         if (dhp == NULL)
 871                                 {
 872                                 al=SSL_AD_HANDSHAKE_FAILURE;
 873                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 874                                 goto f_err;
 875                                 }
 876
 877                         if (s->s3->tmp.dh != NULL)
 878                                 {
 879                                 DH_free(dh);
 880                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 881                                 goto err;
 882                                 }
 883
 884                         if ((dh=DHparams_dup(dhp)) == NULL)
 885                                 {
 886                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 887                                 goto err;
 888                                 }
 889
 890                         s->s3->tmp.dh=dh;
 891                         if ((dhp->pub_key == NULL ||
 892                              dhp->priv_key == NULL ||
 893                              (s->options & SSL_OP_SINGLE_DH_USE)))
 894                                 {
 895                                 if(!DH_generate_key(dh))
 896                                     {
 897                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 898                                            ERR_R_DH_LIB);
 899                                     goto err;
 900                                     }
 901                                 }
 902                         else
 903                                 {
 904                                 dh->pub_key=BN_dup(dhp->pub_key);
 905                                 dh->priv_key=BN_dup(dhp->priv_key);
 906                                 if ((dh->pub_key == NULL) ||
 907                                         (dh->priv_key == NULL))
 908                                         {
 909                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 910                                         goto err;
 911                                         }
 912                                 }
 913                         r[0]=dh->p;
 914                         r[1]=dh->g;
 915                         r[2]=dh->pub_key;
 916                         }
 917                 else
 918 #endif
 919                         {
 920                         al=SSL_AD_HANDSHAKE_FAILURE;
 921                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 922                         goto f_err;
 923                         }
 924                 for (i=0; r[i] != NULL; i++)
 925                         {
 926                         nr[i]=BN_num_bytes(r[i]);
 927                         n+=2+nr[i];
 928                         }
 929
 930                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 931                         {
 932                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 933                                 == NULL)
 934                                 {
 935                                 al=SSL_AD_DECODE_ERROR;
 936                                 goto f_err;
 937                                 }
 938                         kn=EVP_PKEY_size(pkey);
 939                         }
 940                 else
 941                         {
 942                         pkey=NULL;
 943                         kn=0;
 944                         }
 945
 946                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 947                         {
 948                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 949                         goto err;
 950                         }
 951                 d=(unsigned char *)s->init_buf->data;
 952                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 953
 954                 for (i=0; r[i] != NULL; i++)
 955                         {
 956                         s2n(nr[i],p);
 957                         BN_bn2bin(r[i],p);
 958                         p+=nr[i];
 959                         }
 960
 961                 /* not anonymous */
 962                 if (pkey != NULL)
 963                         {
 964                         /* n is the length of the params, they start at
 965                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 966                          * at the end. */
 967 #ifndef OPENSSL_NO_RSA
 968                         if (pkey->type == EVP_PKEY_RSA)
 969                                 {
 970                                 q=md_buf;
 971                                 j=0;
 972                                 for (num=2; num > 0; num--)
 973                                         {
 974                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 975                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 976                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 977                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 978                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 979                                         EVP_DigestFinal_ex(&md_ctx,q,
 980                                                 (unsigned int *)&i);
 981                                         q+=i;
 982                                         j+=i;
 983                                         }
 984                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 985                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 986                                         {
 987                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 988                                         goto err;
 989                                         }
 990                                 s2n(u,p);
 991                                 n+=u+2;
 992                                 }
 993                         else
 994 #endif
 995 #if !defined(OPENSSL_NO_DSA)
 996                                 if (pkey->type == EVP_PKEY_DSA)
 997                                 {
 998                                 /* lets do DSS */
 999                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1000                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1001                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1002                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1003                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1004                                         (unsigned int *)&i,pkey))
1005                                         {
1006                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1007                                         goto err;
1008                                         }
1009                                 s2n(i,p);
1010                                 n+=i+2;
1011                                 }
1012                         else
1013 #endif
1014                                 {
1015                                 /* Is this error check actually needed? */
1016                                 al=SSL_AD_HANDSHAKE_FAILURE;
1017                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1018                                 goto f_err;
1019                                 }
1020                         }
1021
1022                 d = dtls1_set_message_header(s, d,
1023                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1024
1025                 /* we should now have things packed up, so lets send
1026                  * it off */
1027                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1028                 s->init_off=0;
1029
1030                 /* buffer the message to handle re-xmits */
1031                 dtls1_buffer_message(s, 0);
1032                 }
1033
1034         s->state = SSL3_ST_SW_KEY_EXCH_B;
1035         EVP_MD_CTX_cleanup(&md_ctx);
1036         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1037 f_err:
1038         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1039 err:
1040         EVP_MD_CTX_cleanup(&md_ctx);
1041         return(-1);
1042         }
1043
1044 int dtls1_send_certificate_request(SSL *s)
1045         {
1046         unsigned char *p,*d;
1047         int i,j,nl,off,n;
1048         STACK_OF(X509_NAME) *sk=NULL;
1049         X509_NAME *name;
1050         BUF_MEM *buf;
1051         unsigned int msg_len;
1052
1053         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1054                 {
1055                 buf=s->init_buf;
1056
1057                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1058
1059                 /* get the list of acceptable cert types */
1060                 p++;
1061                 n=ssl3_get_req_cert_type(s,p);
1062                 d[0]=n;
1063                 p+=n;
1064                 n++;
1065
1066                 off=n;
1067                 p+=2;
1068                 n+=2;
1069
1070                 sk=SSL_get_client_CA_list(s);
1071                 nl=0;
1072                 if (sk != NULL)
1073                         {
1074                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1075                                 {
1076                                 name=sk_X509_NAME_value(sk,i);
1077                                 j=i2d_X509_NAME(name,NULL);
1078                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1079                                         {
1080                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1081                                         goto err;
1082                                         }
1083                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1084                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1085                                         {
1086                                         s2n(j,p);
1087                                         i2d_X509_NAME(name,&p);
1088                                         n+=2+j;
1089                                         nl+=2+j;
1090                                         }
1091                                 else
1092                                         {
1093                                         d=p;
1094                                         i2d_X509_NAME(name,&p);
1095                                         j-=2; s2n(j,d); j+=2;
1096                                         n+=j;
1097                                         nl+=j;
1098                                         }
1099                                 }
1100                         }
1101                 /* else no CA names */
1102                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1103                 s2n(nl,p);
1104
1105                 d=(unsigned char *)buf->data;
1106                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1107                 l2n3(n,d);
1108                 s2n(s->d1->handshake_write_seq,d);
1109                 s->d1->handshake_write_seq++;
1110
1111                 /* we should now have things packed up, so lets send
1112                  * it off */
1113
1114                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1115                 s->init_off=0;
1116 #ifdef NETSCAPE_HANG_BUG
1117 /* XXX: what to do about this? */
1118                 p=(unsigned char *)s->init_buf->data + s->init_num;
1119
1120                 /* do the header */
1121                 *(p++)=SSL3_MT_SERVER_DONE;
1122                 *(p++)=0;
1123                 *(p++)=0;
1124                 *(p++)=0;
1125                 s->init_num += 4;
1126 #endif
1127
1128                 /* XDTLS:  set message header ? */
1129                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1130                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1131                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1132
1133                 /* buffer the message to handle re-xmits */
1134                 dtls1_buffer_message(s, 0);
1135
1136                 s->state = SSL3_ST_SW_CERT_REQ_B;
1137                 }
1138
1139         /* SSL3_ST_SW_CERT_REQ_B */
1140         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1141 err:
1142         return(-1);
1143         }
1144
1145 int dtls1_send_server_certificate(SSL *s)
1146         {
1147         unsigned long l;
1148         X509 *x;
1149
1150         if (s->state == SSL3_ST_SW_CERT_A)
1151                 {
1152                 x=ssl_get_server_send_cert(s);
1153                 if (x == NULL &&
1154                         /* VRS: allow null cert if auth == KRB5 */
1155                         (s->s3->tmp.new_cipher->algorithms
1156                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1157                         != (SSL_aKRB5|SSL_kKRB5))
1158                         {
1159                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1160                         return(0);
1161                         }
1162
1163                 l=dtls1_output_cert_chain(s,x);
1164                 s->state=SSL3_ST_SW_CERT_B;
1165                 s->init_num=(int)l;
1166                 s->init_off=0;
1167
1168                 /* buffer the message to handle re-xmits */
1169                 dtls1_buffer_message(s, 0);
1170                 }
1171
1172         /* SSL3_ST_SW_CERT_B */
1173         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1174         }