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) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #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 const SSL_METHOD *dtls1_get_server_method(int ver);
 129 static int dtls1_send_hello_verify_request(SSL *s);
 130
 131 static const 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 Time=(unsigned long)time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         long num1;
 150         unsigned long alg_k;
 151         int ret= -1;
 152         int new_state,state,skip=0;
 153
 154         RAND_add(&Time,sizeof(Time),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         for (;;)
 174                 {
 175                 state=s->state;
 176
 177                 switch (s->state)
 178                         {
 179                 case SSL_ST_RENEGOTIATE:
 180                         s->new_session=1;
 181                         /* s->state=SSL_ST_ACCEPT; */
 182
 183                 case SSL_ST_BEFORE:
 184                 case SSL_ST_ACCEPT:
 185                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 186                 case SSL_ST_OK|SSL_ST_ACCEPT:
 187
 188                         s->server=1;
 189                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 190
 191                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 192                                 {
 193                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 194                                 return -1;
 195                                 }
 196                         s->type=SSL_ST_ACCEPT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 }
 212
 213                         if (!ssl3_setup_buffers(s))
 214                                 {
 215                                 ret= -1;
 216                                 goto end;
 217                                 }
 218
 219                         s->init_num=0;
 220
 221                         if (s->state != SSL_ST_RENEGOTIATE)
 222                                 {
 223                                 /* Ok, we now need to push on a buffering BIO so that
 224                                  * the output is sent in a way that TCP likes :-)
 225                                  */
 226                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 227
 228                                 ssl3_init_finished_mac(s);
 229                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 230                                 s->ctx->stats.sess_accept++;
 231                                 }
 232                         else
 233                                 {
 234                                 /* s->state == SSL_ST_RENEGOTIATE,
 235                                  * we will just send a HelloRequest */
 236                                 s->ctx->stats.sess_accept_renegotiate++;
 237                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 238                                 }
 239
 240                         if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 241                                 s->d1->send_cookie = 1;
 242                         else
 243                                 s->d1->send_cookie = 0;
 244
 245                         break;
 246
 247                 case SSL3_ST_SW_HELLO_REQ_A:
 248                 case SSL3_ST_SW_HELLO_REQ_B:
 249
 250                         s->shutdown=0;
 251                         ret=dtls1_send_hello_request(s);
 252                         if (ret <= 0) goto end;
 253                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 254                         s->state=SSL3_ST_SW_FLUSH;
 255                         s->init_num=0;
 256
 257                         ssl3_init_finished_mac(s);
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_C:
 261                         s->state=SSL_ST_OK;
 262                         break;
 263
 264                 case SSL3_ST_SR_CLNT_HELLO_A:
 265                 case SSL3_ST_SR_CLNT_HELLO_B:
 266                 case SSL3_ST_SR_CLNT_HELLO_C:
 267
 268                         s->shutdown=0;
 269                         ret=ssl3_get_client_hello(s);
 270                         if (ret <= 0) goto end;
 271                         s->new_session = 2;
 272
 273                         if (s->d1->send_cookie)
 274                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 275                         else
 276                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 277
 278                         s->init_num=0;
 279                         break;
 280
 281                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 282                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 283
 284                         ret = dtls1_send_hello_verify_request(s);
 285                         if ( ret <= 0) goto end;
 286                         s->d1->send_cookie = 0;
 287                         s->state=SSL3_ST_SW_FLUSH;
 288                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 289                         break;
 290
 291                 case SSL3_ST_SW_SRVR_HELLO_A:
 292                 case SSL3_ST_SW_SRVR_HELLO_B:
 293                         ret=dtls1_send_server_hello(s);
 294                         if (ret <= 0) goto end;
 295
 296                         if (s->hit)
 297                                 s->state=SSL3_ST_SW_CHANGE_A;
 298                         else
 299                                 s->state=SSL3_ST_SW_CERT_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_SW_CERT_A:
 304                 case SSL3_ST_SW_CERT_B:
 305                         /* Check if it is anon DH */
 306                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 307                                 {
 308                                 ret=dtls1_send_server_certificate(s);
 309                                 if (ret <= 0) goto end;
 310                                 }
 311                         else
 312                                 skip=1;
 313                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_SW_KEY_EXCH_A:
 318                 case SSL3_ST_SW_KEY_EXCH_B:
 319                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 320
 321                         /* clear this, it may get reset by
 322                          * send_server_key_exchange */
 323                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 324 #ifndef OPENSSL_NO_KRB5
 325                                 && !(alg_k & SSL_kKRB5)
 326 #endif /* OPENSSL_NO_KRB5 */
 327                                 )
 328                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 329                                  * even when forbidden by protocol specs
 330                                  * (handshake may fail as clients are not required to
 331                                  * be able to handle this) */
 332                                 s->s3->tmp.use_rsa_tmp=1;
 333                         else
 334                                 s->s3->tmp.use_rsa_tmp=0;
 335
 336                         /* only send if a DH key exchange or
 337                          * RSA but we have a sign only certificate */
 338                         if (s->s3->tmp.use_rsa_tmp
 339                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 340                             || ((alg_k & SSL_kRSA)
 341                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 342                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 343                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 344                                         )
 345                                     )
 346                                 )
 347                             )
 348                                 {
 349                                 ret=dtls1_send_server_key_exchange(s);
 350                                 if (ret <= 0) goto end;
 351                                 }
 352                         else
 353                                 skip=1;
 354
 355                         s->state=SSL3_ST_SW_CERT_REQ_A;
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_SW_CERT_REQ_A:
 360                 case SSL3_ST_SW_CERT_REQ_B:
 361                         if (/* don't request cert unless asked for it: */
 362                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 363                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 364                                  * don't request cert during re-negotiation: */
 365                                 ((s->session->peer != NULL) &&
 366                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 367                                 /* never request cert in anonymous ciphersuites
 368                                  * (see section "Certificate request" in SSL 3 drafts
 369                                  * and in RFC 2246): */
 370                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 371                                  /* ... except when the application insists on verification
 372                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 373                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 374                                  /* never request cert in Kerberos ciphersuites */
 375                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 376                                 {
 377                                 /* no cert request */
 378                                 skip=1;
 379                                 s->s3->tmp.cert_request=0;
 380                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 381                                 }
 382                         else
 383                                 {
 384                                 s->s3->tmp.cert_request=1;
 385                                 ret=dtls1_send_certificate_request(s);
 386                                 if (ret <= 0) goto end;
 387 #ifndef NETSCAPE_HANG_BUG
 388                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 389 #else
 390                                 s->state=SSL3_ST_SW_FLUSH;
 391                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 392 #endif
 393                                 s->init_num=0;
 394                                 }
 395                         break;
 396
 397                 case SSL3_ST_SW_SRVR_DONE_A:
 398                 case SSL3_ST_SW_SRVR_DONE_B:
 399                         ret=dtls1_send_server_done(s);
 400                         if (ret <= 0) goto end;
 401                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 402                         s->state=SSL3_ST_SW_FLUSH;
 403                         s->init_num=0;
 404                         break;
 405
 406                 case SSL3_ST_SW_FLUSH:
 407                         /* number of bytes to be flushed */
 408                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 409                         if (num1 > 0)
 410                                 {
 411                                 s->rwstate=SSL_WRITING;
 412                                 num1=BIO_flush(s->wbio);
 413                                 if (num1 <= 0) { ret= -1; goto end; }
 414                                 s->rwstate=SSL_NOTHING;
 415                                 }
 416
 417                         s->state=s->s3->tmp.next_state;
 418                         break;
 419
 420                 case SSL3_ST_SR_CERT_A:
 421                 case SSL3_ST_SR_CERT_B:
 422                         /* Check for second client hello (MS SGC) */
 423                         ret = ssl3_check_client_hello(s);
 424                         if (ret <= 0)
 425                                 goto end;
 426                         if (ret == 2)
 427                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 428                         else {
 429                                 /* could be sent for a DH cert, even if we
 430                                  * have not asked for it :-) */
 431                                 ret=ssl3_get_client_certificate(s);
 432                                 if (ret <= 0) goto end;
 433                                 s->init_num=0;
 434                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 435                         }
 436                         break;
 437
 438                 case SSL3_ST_SR_KEY_EXCH_A:
 439                 case SSL3_ST_SR_KEY_EXCH_B:
 440                         ret=ssl3_get_client_key_exchange(s);
 441                         if (ret <= 0) goto end;
 442                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 443                         s->init_num=0;
 444
 445                         /* We need to get hashes here so if there is
 446                          * a client cert, it can be verified */
 447                         s->method->ssl3_enc->cert_verify_mac(s,
 448                                 NID_md5,
 449                                 &(s->s3->tmp.cert_verify_md[0]));
 450                         s->method->ssl3_enc->cert_verify_mac(s,
 451                                 NID_sha1,
 452                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 453
 454                         break;
 455
 456                 case SSL3_ST_SR_CERT_VRFY_A:
 457                 case SSL3_ST_SR_CERT_VRFY_B:
 458
 459                         /* we should decide if we expected this one */
 460                         ret=ssl3_get_cert_verify(s);
 461                         if (ret <= 0) goto end;
 462
 463                         s->state=SSL3_ST_SR_FINISHED_A;
 464                         s->init_num=0;
 465                         break;
 466
 467                 case SSL3_ST_SR_FINISHED_A:
 468                 case SSL3_ST_SR_FINISHED_B:
 469                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 470                                 SSL3_ST_SR_FINISHED_B);
 471                         if (ret <= 0) goto end;
 472                         if (s->hit)
 473                                 s->state=SSL_ST_OK;
 474                         else
 475                                 s->state=SSL3_ST_SW_CHANGE_A;
 476                         s->init_num=0;
 477                         break;
 478
 479                 case SSL3_ST_SW_CHANGE_A:
 480                 case SSL3_ST_SW_CHANGE_B:
 481
 482                         s->session->cipher=s->s3->tmp.new_cipher;
 483                         if (!s->method->ssl3_enc->setup_key_block(s))
 484                                 { ret= -1; goto end; }
 485
 486                         ret=dtls1_send_change_cipher_spec(s,
 487                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 488
 489                         if (ret <= 0) goto end;
 490                         s->state=SSL3_ST_SW_FINISHED_A;
 491                         s->init_num=0;
 492
 493                         if (!s->method->ssl3_enc->change_cipher_state(s,
 494                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 495                                 {
 496                                 ret= -1;
 497                                 goto end;
 498                                 }
 499
 500                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 501                         break;
 502
 503                 case SSL3_ST_SW_FINISHED_A:
 504                 case SSL3_ST_SW_FINISHED_B:
 505                         ret=dtls1_send_finished(s,
 506                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 507                                 s->method->ssl3_enc->server_finished_label,
 508                                 s->method->ssl3_enc->server_finished_label_len);
 509                         if (ret <= 0) goto end;
 510                         s->state=SSL3_ST_SW_FLUSH;
 511                         if (s->hit)
 512                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 513                         else
 514                                 s->s3->tmp.next_state=SSL_ST_OK;
 515                         s->init_num=0;
 516                         break;
 517
 518                 case SSL_ST_OK:
 519                         /* clean a few things up */
 520                         ssl3_cleanup_key_block(s);
 521
 522 #if 0
 523                         BUF_MEM_free(s->init_buf);
 524                         s->init_buf=NULL;
 525 #endif
 526
 527                         /* remove buffering on output */
 528                         ssl_free_wbio_buffer(s);
 529
 530                         s->init_num=0;
 531
 532                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 533                                 {
 534                                 /* actually not necessarily a 'new' session unless
 535                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 536
 537                                 s->new_session=0;
 538
 539                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 540
 541                                 s->ctx->stats.sess_accept_good++;
 542                                 /* s->server=1; */
 543                                 s->handshake_func=dtls1_accept;
 544
 545                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 546                                 }
 547
 548                         ret = 1;
 549
 550                         /* done handshaking, next message is client hello */
 551                         s->d1->handshake_read_seq = 0;
 552                         /* next message is server hello */
 553                         s->d1->handshake_write_seq = 0;
 554                         goto end;
 555                         /* break; */
 556
 557                 default:
 558                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 559                         ret= -1;
 560                         goto end;
 561                         /* break; */
 562                         }
 563
 564                 if (!s->s3->tmp.reuse_message && !skip)
 565                         {
 566                         if (s->debug)
 567                                 {
 568                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 569                                         goto end;
 570                                 }
 571
 572
 573                         if ((cb != NULL) && (s->state != state))
 574                                 {
 575                                 new_state=s->state;
 576                                 s->state=state;
 577                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 578                                 s->state=new_state;
 579                                 }
 580                         }
 581                 skip=0;
 582                 }
 583 end:
 584         /* BIO_flush(s->wbio); */
 585
 586         s->in_handshake--;
 587         if (cb != NULL)
 588                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 589         return(ret);
 590         }
 591
 592 int dtls1_send_hello_request(SSL *s)
 593         {
 594         unsigned char *p;
 595
 596         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 597                 {
 598                 p=(unsigned char *)s->init_buf->data;
 599                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 600
 601                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 602                 /* number of bytes to write */
 603                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 604                 s->init_off=0;
 605
 606                 /* no need to buffer this message, since there are no retransmit
 607                  * requests for it */
 608                 }
 609
 610         /* SSL3_ST_SW_HELLO_REQ_B */
 611         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 612         }
 613
 614 int dtls1_send_hello_verify_request(SSL *s)
 615         {
 616         unsigned int msg_len;
 617         unsigned char *msg, *buf, *p;
 618
 619         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 620                 {
 621                 buf = (unsigned char *)s->init_buf->data;
 622
 623                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 624                 *(p++) = s->version >> 8;
 625                 *(p++) = s->version & 0xFF;
 626
 627                 *(p++) = (unsigned char) s->d1->cookie_len;
 628
 629                 if (s->ctx->app_gen_cookie_cb != NULL &&
 630                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 631                         &(s->d1->cookie_len)) == 0)
 632                         {
 633                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 634                         return 0;
 635                         }
 636                 /* else the cookie is assumed to have
 637                  * been initialized by the application */
 638
 639                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 640                 p += s->d1->cookie_len;
 641                 msg_len = p - msg;
 642
 643                 dtls1_set_message_header(s, buf,
 644                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 645
 646                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 647                 /* number of bytes to write */
 648                 s->init_num=p-buf;
 649                 s->init_off=0;
 650
 651                 /* buffer the message to handle re-xmits */
 652                 dtls1_buffer_message(s, 0);
 653                 }
 654
 655         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 656         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 657         }
 658
 659 int dtls1_send_server_hello(SSL *s)
 660         {
 661         unsigned char *buf;
 662         unsigned char *p,*d;
 663         int i;
 664         unsigned int sl;
 665         unsigned long l,Time;
 666
 667         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 668                 {
 669                 buf=(unsigned char *)s->init_buf->data;
 670                 p=s->s3->server_random;
 671                 Time=(unsigned long)time(NULL);                 /* Time */
 672                 l2n(Time,p);
 673                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 674                 /* Do the message type and length last */
 675                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 676
 677                 *(p++)=s->version>>8;
 678                 *(p++)=s->version&0xff;
 679
 680                 /* Random stuff */
 681                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 682                 p+=SSL3_RANDOM_SIZE;
 683
 684                 /* now in theory we have 3 options to sending back the
 685                  * session id.  If it is a re-use, we send back the
 686                  * old session-id, if it is a new session, we send
 687                  * back the new session-id or we send back a 0 length
 688                  * session-id if we want it to be single use.
 689                  * Currently I will not implement the '0' length session-id
 690                  * 12-Jan-98 - I'll now support the '0' length stuff.
 691                  */
 692                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 693                         s->session->session_id_length=0;
 694
 695                 sl=s->session->session_id_length;
 696                 if (sl > sizeof s->session->session_id)
 697                         {
 698                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 699                         return -1;
 700                         }
 701                 *(p++)=sl;
 702                 memcpy(p,s->session->session_id,sl);
 703                 p+=sl;
 704
 705                 /* put the cipher */
 706                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 707                 p+=i;
 708
 709                 /* put the compression method */
 710 #ifdef OPENSSL_NO_COMP
 711                 *(p++)=0;
 712 #else
 713                 if (s->s3->tmp.new_compression == NULL)
 714                         *(p++)=0;
 715                 else
 716                         *(p++)=s->s3->tmp.new_compression->id;
 717 #endif
 718
 719                 /* do the header */
 720                 l=(p-d);
 721                 d=buf;
 722
 723                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 724
 725                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 726                 /* number of bytes to write */
 727                 s->init_num=p-buf;
 728                 s->init_off=0;
 729
 730                 /* buffer the message to handle re-xmits */
 731                 dtls1_buffer_message(s, 0);
 732                 }
 733
 734         /* SSL3_ST_CW_CLNT_HELLO_B */
 735         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 736         }
 737
 738 int dtls1_send_server_done(SSL *s)
 739         {
 740         unsigned char *p;
 741
 742         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 743                 {
 744                 p=(unsigned char *)s->init_buf->data;
 745
 746                 /* do the header */
 747                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 748
 749                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 750                 /* number of bytes to write */
 751                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 752                 s->init_off=0;
 753
 754                 /* buffer the message to handle re-xmits */
 755                 dtls1_buffer_message(s, 0);
 756                 }
 757
 758         /* SSL3_ST_CW_CLNT_HELLO_B */
 759         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 760         }
 761
 762 int dtls1_send_server_key_exchange(SSL *s)
 763         {
 764 #ifndef OPENSSL_NO_RSA
 765         unsigned char *q;
 766         int j,num;
 767         RSA *rsa;
 768         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 769         unsigned int u;
 770 #endif
 771 #ifndef OPENSSL_NO_DH
 772         DH *dh=NULL,*dhp;
 773 #endif
 774         EVP_PKEY *pkey;
 775         unsigned char *p,*d;
 776         int al,i;
 777         unsigned long type;
 778         int n;
 779         CERT *cert;
 780         BIGNUM *r[4];
 781         int nr[4],kn;
 782         BUF_MEM *buf;
 783         EVP_MD_CTX md_ctx;
 784
 785         EVP_MD_CTX_init(&md_ctx);
 786         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 787                 {
 788                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 789                 cert=s->cert;
 790
 791                 buf=s->init_buf;
 792
 793                 r[0]=r[1]=r[2]=r[3]=NULL;
 794                 n=0;
 795 #ifndef OPENSSL_NO_RSA
 796                 if (type & SSL_kRSA)
 797                         {
 798                         rsa=cert->rsa_tmp;
 799                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 800                                 {
 801                                 rsa=s->cert->rsa_tmp_cb(s,
 802                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 803                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 804                                 if(rsa == NULL)
 805                                 {
 806                                         al=SSL_AD_HANDSHAKE_FAILURE;
 807                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 808                                         goto f_err;
 809                                 }
 810                                 RSA_up_ref(rsa);
 811                                 cert->rsa_tmp=rsa;
 812                                 }
 813                         if (rsa == NULL)
 814                                 {
 815                                 al=SSL_AD_HANDSHAKE_FAILURE;
 816                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 817                                 goto f_err;
 818                                 }
 819                         r[0]=rsa->n;
 820                         r[1]=rsa->e;
 821                         s->s3->tmp.use_rsa_tmp=1;
 822                         }
 823                 else
 824 #endif
 825 #ifndef OPENSSL_NO_DH
 826                         if (type & SSL_kEDH)
 827                         {
 828                         dhp=cert->dh_tmp;
 829                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 830                                 dhp=s->cert->dh_tmp_cb(s,
 831                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 832                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 833                         if (dhp == NULL)
 834                                 {
 835                                 al=SSL_AD_HANDSHAKE_FAILURE;
 836                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 837                                 goto f_err;
 838                                 }
 839
 840                         if (s->s3->tmp.dh != NULL)
 841                                 {
 842                                 DH_free(dh);
 843                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 844                                 goto err;
 845                                 }
 846
 847                         if ((dh=DHparams_dup(dhp)) == NULL)
 848                                 {
 849                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 850                                 goto err;
 851                                 }
 852
 853                         s->s3->tmp.dh=dh;
 854                         if ((dhp->pub_key == NULL ||
 855                              dhp->priv_key == NULL ||
 856                              (s->options & SSL_OP_SINGLE_DH_USE)))
 857                                 {
 858                                 if(!DH_generate_key(dh))
 859                                     {
 860                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 861                                            ERR_R_DH_LIB);
 862                                     goto err;
 863                                     }
 864                                 }
 865                         else
 866                                 {
 867                                 dh->pub_key=BN_dup(dhp->pub_key);
 868                                 dh->priv_key=BN_dup(dhp->priv_key);
 869                                 if ((dh->pub_key == NULL) ||
 870                                         (dh->priv_key == NULL))
 871                                         {
 872                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 873                                         goto err;
 874                                         }
 875                                 }
 876                         r[0]=dh->p;
 877                         r[1]=dh->g;
 878                         r[2]=dh->pub_key;
 879                         }
 880                 else
 881 #endif
 882                         {
 883                         al=SSL_AD_HANDSHAKE_FAILURE;
 884                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 885                         goto f_err;
 886                         }
 887                 for (i=0; r[i] != NULL; i++)
 888                         {
 889                         nr[i]=BN_num_bytes(r[i]);
 890                         n+=2+nr[i];
 891                         }
 892
 893                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 894                         {
 895                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 896                                 == NULL)
 897                                 {
 898                                 al=SSL_AD_DECODE_ERROR;
 899                                 goto f_err;
 900                                 }
 901                         kn=EVP_PKEY_size(pkey);
 902                         }
 903                 else
 904                         {
 905                         pkey=NULL;
 906                         kn=0;
 907                         }
 908
 909                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 910                         {
 911                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 912                         goto err;
 913                         }
 914                 d=(unsigned char *)s->init_buf->data;
 915                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 916
 917                 for (i=0; r[i] != NULL; i++)
 918                         {
 919                         s2n(nr[i],p);
 920                         BN_bn2bin(r[i],p);
 921                         p+=nr[i];
 922                         }
 923
 924                 /* not anonymous */
 925                 if (pkey != NULL)
 926                         {
 927                         /* n is the length of the params, they start at
 928                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 929                          * at the end. */
 930 #ifndef OPENSSL_NO_RSA
 931                         if (pkey->type == EVP_PKEY_RSA)
 932                                 {
 933                                 q=md_buf;
 934                                 j=0;
 935                                 for (num=2; num > 0; num--)
 936                                         {
 937                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 938                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 939                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 940                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 941                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 942                                         EVP_DigestFinal_ex(&md_ctx,q,
 943                                                 (unsigned int *)&i);
 944                                         q+=i;
 945                                         j+=i;
 946                                         }
 947                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 948                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 949                                         {
 950                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 951                                         goto err;
 952                                         }
 953                                 s2n(u,p);
 954                                 n+=u+2;
 955                                 }
 956                         else
 957 #endif
 958 #if !defined(OPENSSL_NO_DSA)
 959                                 if (pkey->type == EVP_PKEY_DSA)
 960                                 {
 961                                 /* lets do DSS */
 962                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 963                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 964                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 965                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 966                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 967                                         (unsigned int *)&i,pkey))
 968                                         {
 969                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 970                                         goto err;
 971                                         }
 972                                 s2n(i,p);
 973                                 n+=i+2;
 974                                 }
 975                         else
 976 #endif
 977                                 {
 978                                 /* Is this error check actually needed? */
 979                                 al=SSL_AD_HANDSHAKE_FAILURE;
 980                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 981                                 goto f_err;
 982                                 }
 983                         }
 984
 985                 d = dtls1_set_message_header(s, d,
 986                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 987
 988                 /* we should now have things packed up, so lets send
 989                  * it off */
 990                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 991                 s->init_off=0;
 992
 993                 /* buffer the message to handle re-xmits */
 994                 dtls1_buffer_message(s, 0);
 995                 }
 996
 997         s->state = SSL3_ST_SW_KEY_EXCH_B;
 998         EVP_MD_CTX_cleanup(&md_ctx);
 999         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1000 f_err:
1001         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1002 err:
1003         EVP_MD_CTX_cleanup(&md_ctx);
1004         return(-1);
1005         }
1006
1007 int dtls1_send_certificate_request(SSL *s)
1008         {
1009         unsigned char *p,*d;
1010         int i,j,nl,off,n;
1011         STACK_OF(X509_NAME) *sk=NULL;
1012         X509_NAME *name;
1013         BUF_MEM *buf;
1014         unsigned int msg_len;
1015
1016         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1017                 {
1018                 buf=s->init_buf;
1019
1020                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1021
1022                 /* get the list of acceptable cert types */
1023                 p++;
1024                 n=ssl3_get_req_cert_type(s,p);
1025                 d[0]=n;
1026                 p+=n;
1027                 n++;
1028
1029                 off=n;
1030                 p+=2;
1031                 n+=2;
1032
1033                 sk=SSL_get_client_CA_list(s);
1034                 nl=0;
1035                 if (sk != NULL)
1036                         {
1037                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1038                                 {
1039                                 name=sk_X509_NAME_value(sk,i);
1040                                 j=i2d_X509_NAME(name,NULL);
1041                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1042                                         {
1043                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1044                                         goto err;
1045                                         }
1046                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1047                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1048                                         {
1049                                         s2n(j,p);
1050                                         i2d_X509_NAME(name,&p);
1051                                         n+=2+j;
1052                                         nl+=2+j;
1053                                         }
1054                                 else
1055                                         {
1056                                         d=p;
1057                                         i2d_X509_NAME(name,&p);
1058                                         j-=2; s2n(j,d); j+=2;
1059                                         n+=j;
1060                                         nl+=j;
1061                                         }
1062                                 }
1063                         }
1064                 /* else no CA names */
1065                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1066                 s2n(nl,p);
1067
1068                 d=(unsigned char *)buf->data;
1069                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1070                 l2n3(n,d);
1071                 s2n(s->d1->handshake_write_seq,d);
1072                 s->d1->handshake_write_seq++;
1073
1074                 /* we should now have things packed up, so lets send
1075                  * it off */
1076
1077                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1078                 s->init_off=0;
1079 #ifdef NETSCAPE_HANG_BUG
1080 /* XXX: what to do about this? */
1081                 p=(unsigned char *)s->init_buf->data + s->init_num;
1082
1083                 /* do the header */
1084                 *(p++)=SSL3_MT_SERVER_DONE;
1085                 *(p++)=0;
1086                 *(p++)=0;
1087                 *(p++)=0;
1088                 s->init_num += 4;
1089 #endif
1090
1091                 /* XDTLS:  set message header ? */
1092                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1093                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1094                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1095
1096                 /* buffer the message to handle re-xmits */
1097                 dtls1_buffer_message(s, 0);
1098
1099                 s->state = SSL3_ST_SW_CERT_REQ_B;
1100                 }
1101
1102         /* SSL3_ST_SW_CERT_REQ_B */
1103         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1104 err:
1105         return(-1);
1106         }
1107
1108 int dtls1_send_server_certificate(SSL *s)
1109         {
1110         unsigned long l;
1111         X509 *x;
1112
1113         if (s->state == SSL3_ST_SW_CERT_A)
1114                 {
1115                 x=ssl_get_server_send_cert(s);
1116                 if (x == NULL)
1117                         {
1118                         /* VRS: allow null cert if auth == KRB5 */
1119                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1120                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1121                                 {
1122                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1123                                 return(0);
1124                                 }
1125                         }
1126
1127                 l=dtls1_output_cert_chain(s,x);
1128                 s->state=SSL3_ST_SW_CERT_B;
1129                 s->init_num=(int)l;
1130                 s->init_off=0;
1131
1132                 /* buffer the message to handle re-xmits */
1133                 dtls1_buffer_message(s, 0);
1134                 }
1135
1136         /* SSL3_ST_SW_CERT_B */
1137         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1138         }