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 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         long num1;
 151         unsigned long alg_k;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         /* init things to blank */
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         if (s->cert == NULL)
 169                 {
 170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 171                 return(-1);
 172                 }
 173
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_RENEGOTIATE:
 181                         s->new_session=1;
 182                         /* s->state=SSL_ST_ACCEPT; */
 183
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_ACCEPT:
 186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 187                 case SSL_ST_OK|SSL_ST_ACCEPT:
 188
 189                         s->server=1;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 193                                 {
 194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 195                                 return -1;
 196                                 }
 197                         s->type=SSL_ST_ACCEPT;
 198
 199                         if (s->init_buf == NULL)
 200                                 {
 201                                 if ((buf=BUF_MEM_new()) == NULL)
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 207                                         {
 208                                         ret= -1;
 209                                         goto end;
 210                                         }
 211                                 s->init_buf=buf;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s))
 215                                 {
 216                                 ret= -1;
 217                                 goto end;
 218                                 }
 219
 220                         s->init_num=0;
 221
 222                         if (s->state != SSL_ST_RENEGOTIATE)
 223                                 {
 224                                 /* Ok, we now need to push on a buffering BIO so that
 225                                  * the output is sent in a way that TCP likes :-)
 226                                  */
 227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 228
 229                                 ssl3_init_finished_mac(s);
 230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 231                                 s->ctx->stats.sess_accept++;
 232                                 }
 233                         else
 234                                 {
 235                                 /* s->state == SSL_ST_RENEGOTIATE,
 236                                  * we will just send a HelloRequest */
 237                                 s->ctx->stats.sess_accept_renegotiate++;
 238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 239                                 }
 240
 241                         if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 242                                 s->d1->send_cookie = 1;
 243                         else
 244                                 s->d1->send_cookie = 0;
 245
 246                         break;
 247
 248                 case SSL3_ST_SW_HELLO_REQ_A:
 249                 case SSL3_ST_SW_HELLO_REQ_B:
 250
 251                         s->shutdown=0;
 252                         ret=dtls1_send_hello_request(s);
 253                         if (ret <= 0) goto end;
 254                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 255                         s->state=SSL3_ST_SW_FLUSH;
 256                         s->init_num=0;
 257
 258                         ssl3_init_finished_mac(s);
 259                         break;
 260
 261                 case SSL3_ST_SW_HELLO_REQ_C:
 262                         s->state=SSL_ST_OK;
 263                         break;
 264
 265                 case SSL3_ST_SR_CLNT_HELLO_A:
 266                 case SSL3_ST_SR_CLNT_HELLO_B:
 267                 case SSL3_ST_SR_CLNT_HELLO_C:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_get_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         s->new_session = 2;
 273
 274                         if (s->d1->send_cookie)
 275                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 276                         else
 277                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 278
 279                         s->init_num=0;
 280                         break;
 281
 282                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 283                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 284
 285                         ret = dtls1_send_hello_verify_request(s);
 286                         if ( ret <= 0) goto end;
 287                         s->d1->send_cookie = 0;
 288                         s->state=SSL3_ST_SW_FLUSH;
 289                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 290
 291                         /* HelloVerifyRequest resets Finished MAC */
 292                         ssl3_init_finished_mac(s);
 293                         break;
 294
 295                 case SSL3_ST_SW_SRVR_HELLO_A:
 296                 case SSL3_ST_SW_SRVR_HELLO_B:
 297                         ret=dtls1_send_server_hello(s);
 298                         if (ret <= 0) goto end;
 299
 300                         if (s->hit)
 301                                 s->state=SSL3_ST_SW_CHANGE_A;
 302                         else
 303                                 s->state=SSL3_ST_SW_CERT_A;
 304                         s->init_num=0;
 305                         break;
 306
 307                 case SSL3_ST_SW_CERT_A:
 308                 case SSL3_ST_SW_CERT_B:
 309                         /* Check if it is anon DH */
 310                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 311                                 {
 312                                 ret=dtls1_send_server_certificate(s);
 313                                 if (ret <= 0) goto end;
 314                                 }
 315                         else
 316                                 skip=1;
 317                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 318                         s->init_num=0;
 319                         break;
 320
 321                 case SSL3_ST_SW_KEY_EXCH_A:
 322                 case SSL3_ST_SW_KEY_EXCH_B:
 323                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 324
 325                         /* clear this, it may get reset by
 326                          * send_server_key_exchange */
 327                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 328 #ifndef OPENSSL_NO_KRB5
 329                                 && !(alg_k & SSL_kKRB5)
 330 #endif /* OPENSSL_NO_KRB5 */
 331                                 )
 332                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 333                                  * even when forbidden by protocol specs
 334                                  * (handshake may fail as clients are not required to
 335                                  * be able to handle this) */
 336                                 s->s3->tmp.use_rsa_tmp=1;
 337                         else
 338                                 s->s3->tmp.use_rsa_tmp=0;
 339
 340                         /* only send if a DH key exchange or
 341                          * RSA but we have a sign only certificate */
 342                         if (s->s3->tmp.use_rsa_tmp
 343                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 344                             || ((alg_k & SSL_kRSA)
 345                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 346                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 347                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 348                                         )
 349                                     )
 350                                 )
 351                             )
 352                                 {
 353                                 ret=dtls1_send_server_key_exchange(s);
 354                                 if (ret <= 0) goto end;
 355                                 }
 356                         else
 357                                 skip=1;
 358
 359                         s->state=SSL3_ST_SW_CERT_REQ_A;
 360                         s->init_num=0;
 361                         break;
 362
 363                 case SSL3_ST_SW_CERT_REQ_A:
 364                 case SSL3_ST_SW_CERT_REQ_B:
 365                         if (/* don't request cert unless asked for it: */
 366                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 367                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 368                                  * don't request cert during re-negotiation: */
 369                                 ((s->session->peer != NULL) &&
 370                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 371                                 /* never request cert in anonymous ciphersuites
 372                                  * (see section "Certificate request" in SSL 3 drafts
 373                                  * and in RFC 2246): */
 374                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 375                                  /* ... except when the application insists on verification
 376                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 377                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 378                                  /* never request cert in Kerberos ciphersuites */
 379                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 380                                 {
 381                                 /* no cert request */
 382                                 skip=1;
 383                                 s->s3->tmp.cert_request=0;
 384                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 385                                 }
 386                         else
 387                                 {
 388                                 s->s3->tmp.cert_request=1;
 389                                 ret=dtls1_send_certificate_request(s);
 390                                 if (ret <= 0) goto end;
 391 #ifndef NETSCAPE_HANG_BUG
 392                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 393 #else
 394                                 s->state=SSL3_ST_SW_FLUSH;
 395                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 396 #endif
 397                                 s->init_num=0;
 398                                 }
 399                         break;
 400
 401                 case SSL3_ST_SW_SRVR_DONE_A:
 402                 case SSL3_ST_SW_SRVR_DONE_B:
 403                         ret=dtls1_send_server_done(s);
 404                         if (ret <= 0) goto end;
 405                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 406                         s->state=SSL3_ST_SW_FLUSH;
 407                         s->init_num=0;
 408                         break;
 409
 410                 case SSL3_ST_SW_FLUSH:
 411                         /* number of bytes to be flushed */
 412                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 413                         if (num1 > 0)
 414                                 {
 415                                 s->rwstate=SSL_WRITING;
 416                                 num1=BIO_flush(s->wbio);
 417                                 if (num1 <= 0) { ret= -1; goto end; }
 418                                 s->rwstate=SSL_NOTHING;
 419                                 }
 420
 421                         s->state=s->s3->tmp.next_state;
 422                         break;
 423
 424                 case SSL3_ST_SR_CERT_A:
 425                 case SSL3_ST_SR_CERT_B:
 426                         /* Check for second client hello (MS SGC) */
 427                         ret = ssl3_check_client_hello(s);
 428                         if (ret <= 0)
 429                                 goto end;
 430                         if (ret == 2)
 431                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 432                         else {
 433                                 /* could be sent for a DH cert, even if we
 434                                  * have not asked for it :-) */
 435                                 ret=ssl3_get_client_certificate(s);
 436                                 if (ret <= 0) goto end;
 437                                 s->init_num=0;
 438                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 439                         }
 440                         break;
 441
 442                 case SSL3_ST_SR_KEY_EXCH_A:
 443                 case SSL3_ST_SR_KEY_EXCH_B:
 444                         ret=ssl3_get_client_key_exchange(s);
 445                         if (ret <= 0) goto end;
 446                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 447                         s->init_num=0;
 448
 449                         /* We need to get hashes here so if there is
 450                          * a client cert, it can be verified */
 451                         s->method->ssl3_enc->cert_verify_mac(s,
 452                                 NID_md5,
 453                                 &(s->s3->tmp.cert_verify_md[0]));
 454                         s->method->ssl3_enc->cert_verify_mac(s,
 455                                 NID_sha1,
 456                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 457
 458                         break;
 459
 460                 case SSL3_ST_SR_CERT_VRFY_A:
 461                 case SSL3_ST_SR_CERT_VRFY_B:
 462
 463                         /* we should decide if we expected this one */
 464                         ret=ssl3_get_cert_verify(s);
 465                         if (ret <= 0) goto end;
 466
 467                         s->state=SSL3_ST_SR_FINISHED_A;
 468                         s->init_num=0;
 469                         break;
 470
 471                 case SSL3_ST_SR_FINISHED_A:
 472                 case SSL3_ST_SR_FINISHED_B:
 473                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 474                                 SSL3_ST_SR_FINISHED_B);
 475                         if (ret <= 0) goto end;
 476                         if (s->hit)
 477                                 s->state=SSL_ST_OK;
 478                         else
 479                                 s->state=SSL3_ST_SW_CHANGE_A;
 480                         s->init_num=0;
 481                         break;
 482
 483                 case SSL3_ST_SW_CHANGE_A:
 484                 case SSL3_ST_SW_CHANGE_B:
 485
 486                         s->session->cipher=s->s3->tmp.new_cipher;
 487                         if (!s->method->ssl3_enc->setup_key_block(s))
 488                                 { ret= -1; goto end; }
 489
 490                         ret=dtls1_send_change_cipher_spec(s,
 491                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 492
 493                         if (ret <= 0) goto end;
 494                         s->state=SSL3_ST_SW_FINISHED_A;
 495                         s->init_num=0;
 496
 497                         if (!s->method->ssl3_enc->change_cipher_state(s,
 498                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 499                                 {
 500                                 ret= -1;
 501                                 goto end;
 502                                 }
 503
 504                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 505                         break;
 506
 507                 case SSL3_ST_SW_FINISHED_A:
 508                 case SSL3_ST_SW_FINISHED_B:
 509                         ret=dtls1_send_finished(s,
 510                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 511                                 s->method->ssl3_enc->server_finished_label,
 512                                 s->method->ssl3_enc->server_finished_label_len);
 513                         if (ret <= 0) goto end;
 514                         s->state=SSL3_ST_SW_FLUSH;
 515                         if (s->hit)
 516                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 517                         else
 518                                 s->s3->tmp.next_state=SSL_ST_OK;
 519                         s->init_num=0;
 520                         break;
 521
 522                 case SSL_ST_OK:
 523                         /* clean a few things up */
 524                         ssl3_cleanup_key_block(s);
 525
 526 #if 0
 527                         BUF_MEM_free(s->init_buf);
 528                         s->init_buf=NULL;
 529 #endif
 530
 531                         /* remove buffering on output */
 532                         ssl_free_wbio_buffer(s);
 533
 534                         s->init_num=0;
 535
 536                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 537                                 {
 538                                 /* actually not necessarily a 'new' session unless
 539                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 540
 541                                 s->new_session=0;
 542
 543                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 544
 545                                 s->ctx->stats.sess_accept_good++;
 546                                 /* s->server=1; */
 547                                 s->handshake_func=dtls1_accept;
 548
 549                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 550                                 }
 551
 552                         ret = 1;
 553
 554                         /* done handshaking, next message is client hello */
 555                         s->d1->handshake_read_seq = 0;
 556                         /* next message is server hello */
 557                         s->d1->handshake_write_seq = 0;
 558                         goto end;
 559                         /* break; */
 560
 561                 default:
 562                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 563                         ret= -1;
 564                         goto end;
 565                         /* break; */
 566                         }
 567
 568                 if (!s->s3->tmp.reuse_message && !skip)
 569                         {
 570                         if (s->debug)
 571                                 {
 572                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 573                                         goto end;
 574                                 }
 575
 576
 577                         if ((cb != NULL) && (s->state != state))
 578                                 {
 579                                 new_state=s->state;
 580                                 s->state=state;
 581                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 582                                 s->state=new_state;
 583                                 }
 584                         }
 585                 skip=0;
 586                 }
 587 end:
 588         /* BIO_flush(s->wbio); */
 589
 590         s->in_handshake--;
 591         if (cb != NULL)
 592                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 593         return(ret);
 594         }
 595
 596 int dtls1_send_hello_request(SSL *s)
 597         {
 598         unsigned char *p;
 599
 600         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 601                 {
 602                 p=(unsigned char *)s->init_buf->data;
 603                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 604
 605                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 606                 /* number of bytes to write */
 607                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 608                 s->init_off=0;
 609
 610                 /* no need to buffer this message, since there are no retransmit
 611                  * requests for it */
 612                 }
 613
 614         /* SSL3_ST_SW_HELLO_REQ_B */
 615         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 616         }
 617
 618 int dtls1_send_hello_verify_request(SSL *s)
 619         {
 620         unsigned int msg_len;
 621         unsigned char *msg, *buf, *p;
 622
 623         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 624                 {
 625                 buf = (unsigned char *)s->init_buf->data;
 626
 627                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 628                 *(p++) = s->version >> 8;
 629                 *(p++) = s->version & 0xFF;
 630
 631                 if (s->ctx->app_gen_cookie_cb != NULL &&
 632                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 633                         &(s->d1->cookie_len)) == 0)
 634                         {
 635                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 636                         return 0;
 637                         }
 638                 /* else the cookie is assumed to have
 639                  * been initialized by the application */
 640
 641                 *(p++) = (unsigned char) s->d1->cookie_len;
 642                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 643                 p += s->d1->cookie_len;
 644                 msg_len = p - msg;
 645
 646                 dtls1_set_message_header(s, buf,
 647                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 648
 649                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 650                 /* number of bytes to write */
 651                 s->init_num=p-buf;
 652                 s->init_off=0;
 653
 654                 /* buffer the message to handle re-xmits */
 655                 dtls1_buffer_message(s, 0);
 656                 }
 657
 658         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 659         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 660         }
 661
 662 int dtls1_send_server_hello(SSL *s)
 663         {
 664         unsigned char *buf;
 665         unsigned char *p,*d;
 666         int i;
 667         unsigned int sl;
 668         unsigned long l,Time;
 669
 670         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 671                 {
 672                 buf=(unsigned char *)s->init_buf->data;
 673                 p=s->s3->server_random;
 674                 Time=(unsigned long)time(NULL);                 /* Time */
 675                 l2n(Time,p);
 676                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 677                 /* Do the message type and length last */
 678                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 679
 680                 *(p++)=s->version>>8;
 681                 *(p++)=s->version&0xff;
 682
 683                 /* Random stuff */
 684                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 685                 p+=SSL3_RANDOM_SIZE;
 686
 687                 /* now in theory we have 3 options to sending back the
 688                  * session id.  If it is a re-use, we send back the
 689                  * old session-id, if it is a new session, we send
 690                  * back the new session-id or we send back a 0 length
 691                  * session-id if we want it to be single use.
 692                  * Currently I will not implement the '0' length session-id
 693                  * 12-Jan-98 - I'll now support the '0' length stuff.
 694                  */
 695                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 696                         s->session->session_id_length=0;
 697
 698                 sl=s->session->session_id_length;
 699                 if (sl > sizeof s->session->session_id)
 700                         {
 701                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 702                         return -1;
 703                         }
 704                 *(p++)=sl;
 705                 memcpy(p,s->session->session_id,sl);
 706                 p+=sl;
 707
 708                 /* put the cipher */
 709                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 710                 p+=i;
 711
 712                 /* put the compression method */
 713 #ifdef OPENSSL_NO_COMP
 714                 *(p++)=0;
 715 #else
 716                 if (s->s3->tmp.new_compression == NULL)
 717                         *(p++)=0;
 718                 else
 719                         *(p++)=s->s3->tmp.new_compression->id;
 720 #endif
 721
 722                 /* do the header */
 723                 l=(p-d);
 724                 d=buf;
 725
 726                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 727
 728                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 729                 /* number of bytes to write */
 730                 s->init_num=p-buf;
 731                 s->init_off=0;
 732
 733                 /* buffer the message to handle re-xmits */
 734                 dtls1_buffer_message(s, 0);
 735                 }
 736
 737         /* SSL3_ST_CW_CLNT_HELLO_B */
 738         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 739         }
 740
 741 int dtls1_send_server_done(SSL *s)
 742         {
 743         unsigned char *p;
 744
 745         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 746                 {
 747                 p=(unsigned char *)s->init_buf->data;
 748
 749                 /* do the header */
 750                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 751
 752                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 753                 /* number of bytes to write */
 754                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 755                 s->init_off=0;
 756
 757                 /* buffer the message to handle re-xmits */
 758                 dtls1_buffer_message(s, 0);
 759                 }
 760
 761         /* SSL3_ST_CW_CLNT_HELLO_B */
 762         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 763         }
 764
 765 int dtls1_send_server_key_exchange(SSL *s)
 766         {
 767 #ifndef OPENSSL_NO_RSA
 768         unsigned char *q;
 769         int j,num;
 770         RSA *rsa;
 771         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 772         unsigned int u;
 773 #endif
 774 #ifndef OPENSSL_NO_DH
 775         DH *dh=NULL,*dhp;
 776 #endif
 777         EVP_PKEY *pkey;
 778         unsigned char *p,*d;
 779         int al,i;
 780         unsigned long type;
 781         int n;
 782         CERT *cert;
 783         BIGNUM *r[4];
 784         int nr[4],kn;
 785         BUF_MEM *buf;
 786         EVP_MD_CTX md_ctx;
 787
 788         EVP_MD_CTX_init(&md_ctx);
 789         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 790                 {
 791                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 792                 cert=s->cert;
 793
 794                 buf=s->init_buf;
 795
 796                 r[0]=r[1]=r[2]=r[3]=NULL;
 797                 n=0;
 798 #ifndef OPENSSL_NO_RSA
 799                 if (type & SSL_kRSA)
 800                         {
 801                         rsa=cert->rsa_tmp;
 802                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 803                                 {
 804                                 rsa=s->cert->rsa_tmp_cb(s,
 805                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 806                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 807                                 if(rsa == NULL)
 808                                 {
 809                                         al=SSL_AD_HANDSHAKE_FAILURE;
 810                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 811                                         goto f_err;
 812                                 }
 813                                 RSA_up_ref(rsa);
 814                                 cert->rsa_tmp=rsa;
 815                                 }
 816                         if (rsa == NULL)
 817                                 {
 818                                 al=SSL_AD_HANDSHAKE_FAILURE;
 819                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 820                                 goto f_err;
 821                                 }
 822                         r[0]=rsa->n;
 823                         r[1]=rsa->e;
 824                         s->s3->tmp.use_rsa_tmp=1;
 825                         }
 826                 else
 827 #endif
 828 #ifndef OPENSSL_NO_DH
 829                         if (type & SSL_kEDH)
 830                         {
 831                         dhp=cert->dh_tmp;
 832                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 833                                 dhp=s->cert->dh_tmp_cb(s,
 834                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 835                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 836                         if (dhp == NULL)
 837                                 {
 838                                 al=SSL_AD_HANDSHAKE_FAILURE;
 839                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 840                                 goto f_err;
 841                                 }
 842
 843                         if (s->s3->tmp.dh != NULL)
 844                                 {
 845                                 DH_free(dh);
 846                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 847                                 goto err;
 848                                 }
 849
 850                         if ((dh=DHparams_dup(dhp)) == NULL)
 851                                 {
 852                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 853                                 goto err;
 854                                 }
 855
 856                         s->s3->tmp.dh=dh;
 857                         if ((dhp->pub_key == NULL ||
 858                              dhp->priv_key == NULL ||
 859                              (s->options & SSL_OP_SINGLE_DH_USE)))
 860                                 {
 861                                 if(!DH_generate_key(dh))
 862                                     {
 863                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 864                                            ERR_R_DH_LIB);
 865                                     goto err;
 866                                     }
 867                                 }
 868                         else
 869                                 {
 870                                 dh->pub_key=BN_dup(dhp->pub_key);
 871                                 dh->priv_key=BN_dup(dhp->priv_key);
 872                                 if ((dh->pub_key == NULL) ||
 873                                         (dh->priv_key == NULL))
 874                                         {
 875                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 876                                         goto err;
 877                                         }
 878                                 }
 879                         r[0]=dh->p;
 880                         r[1]=dh->g;
 881                         r[2]=dh->pub_key;
 882                         }
 883                 else
 884 #endif
 885                         {
 886                         al=SSL_AD_HANDSHAKE_FAILURE;
 887                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 888                         goto f_err;
 889                         }
 890                 for (i=0; r[i] != NULL; i++)
 891                         {
 892                         nr[i]=BN_num_bytes(r[i]);
 893                         n+=2+nr[i];
 894                         }
 895
 896                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 897                         {
 898                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 899                                 == NULL)
 900                                 {
 901                                 al=SSL_AD_DECODE_ERROR;
 902                                 goto f_err;
 903                                 }
 904                         kn=EVP_PKEY_size(pkey);
 905                         }
 906                 else
 907                         {
 908                         pkey=NULL;
 909                         kn=0;
 910                         }
 911
 912                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 913                         {
 914                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 915                         goto err;
 916                         }
 917                 d=(unsigned char *)s->init_buf->data;
 918                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 919
 920                 for (i=0; r[i] != NULL; i++)
 921                         {
 922                         s2n(nr[i],p);
 923                         BN_bn2bin(r[i],p);
 924                         p+=nr[i];
 925                         }
 926
 927                 /* not anonymous */
 928                 if (pkey != NULL)
 929                         {
 930                         /* n is the length of the params, they start at
 931                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 932                          * at the end. */
 933 #ifndef OPENSSL_NO_RSA
 934                         if (pkey->type == EVP_PKEY_RSA)
 935                                 {
 936                                 q=md_buf;
 937                                 j=0;
 938                                 for (num=2; num > 0; num--)
 939                                         {
 940                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 941                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 944                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 945                                         EVP_DigestFinal_ex(&md_ctx,q,
 946                                                 (unsigned int *)&i);
 947                                         q+=i;
 948                                         j+=i;
 949                                         }
 950                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 951                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 952                                         {
 953                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 954                                         goto err;
 955                                         }
 956                                 s2n(u,p);
 957                                 n+=u+2;
 958                                 }
 959                         else
 960 #endif
 961 #if !defined(OPENSSL_NO_DSA)
 962                                 if (pkey->type == EVP_PKEY_DSA)
 963                                 {
 964                                 /* lets do DSS */
 965                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 966                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 967                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 968                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 969                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 970                                         (unsigned int *)&i,pkey))
 971                                         {
 972                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 973                                         goto err;
 974                                         }
 975                                 s2n(i,p);
 976                                 n+=i+2;
 977                                 }
 978                         else
 979 #endif
 980                                 {
 981                                 /* Is this error check actually needed? */
 982                                 al=SSL_AD_HANDSHAKE_FAILURE;
 983                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 984                                 goto f_err;
 985                                 }
 986                         }
 987
 988                 d = dtls1_set_message_header(s, d,
 989                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 990
 991                 /* we should now have things packed up, so lets send
 992                  * it off */
 993                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 994                 s->init_off=0;
 995
 996                 /* buffer the message to handle re-xmits */
 997                 dtls1_buffer_message(s, 0);
 998                 }
 999
1000         s->state = SSL3_ST_SW_KEY_EXCH_B;
1001         EVP_MD_CTX_cleanup(&md_ctx);
1002         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1003 f_err:
1004         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1005 err:
1006         EVP_MD_CTX_cleanup(&md_ctx);
1007         return(-1);
1008         }
1009
1010 int dtls1_send_certificate_request(SSL *s)
1011         {
1012         unsigned char *p,*d;
1013         int i,j,nl,off,n;
1014         STACK_OF(X509_NAME) *sk=NULL;
1015         X509_NAME *name;
1016         BUF_MEM *buf;
1017         unsigned int msg_len;
1018
1019         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1020                 {
1021                 buf=s->init_buf;
1022
1023                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1024
1025                 /* get the list of acceptable cert types */
1026                 p++;
1027                 n=ssl3_get_req_cert_type(s,p);
1028                 d[0]=n;
1029                 p+=n;
1030                 n++;
1031
1032                 off=n;
1033                 p+=2;
1034                 n+=2;
1035
1036                 sk=SSL_get_client_CA_list(s);
1037                 nl=0;
1038                 if (sk != NULL)
1039                         {
1040                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1041                                 {
1042                                 name=sk_X509_NAME_value(sk,i);
1043                                 j=i2d_X509_NAME(name,NULL);
1044                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1045                                         {
1046                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1047                                         goto err;
1048                                         }
1049                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1050                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1051                                         {
1052                                         s2n(j,p);
1053                                         i2d_X509_NAME(name,&p);
1054                                         n+=2+j;
1055                                         nl+=2+j;
1056                                         }
1057                                 else
1058                                         {
1059                                         d=p;
1060                                         i2d_X509_NAME(name,&p);
1061                                         j-=2; s2n(j,d); j+=2;
1062                                         n+=j;
1063                                         nl+=j;
1064                                         }
1065                                 }
1066                         }
1067                 /* else no CA names */
1068                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1069                 s2n(nl,p);
1070
1071                 d=(unsigned char *)buf->data;
1072                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1073                 l2n3(n,d);
1074                 s2n(s->d1->handshake_write_seq,d);
1075                 s->d1->handshake_write_seq++;
1076
1077                 /* we should now have things packed up, so lets send
1078                  * it off */
1079
1080                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1081                 s->init_off=0;
1082 #ifdef NETSCAPE_HANG_BUG
1083 /* XXX: what to do about this? */
1084                 p=(unsigned char *)s->init_buf->data + s->init_num;
1085
1086                 /* do the header */
1087                 *(p++)=SSL3_MT_SERVER_DONE;
1088                 *(p++)=0;
1089                 *(p++)=0;
1090                 *(p++)=0;
1091                 s->init_num += 4;
1092 #endif
1093
1094                 /* XDTLS:  set message header ? */
1095                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1096                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1097                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1098
1099                 /* buffer the message to handle re-xmits */
1100                 dtls1_buffer_message(s, 0);
1101
1102                 s->state = SSL3_ST_SW_CERT_REQ_B;
1103                 }
1104
1105         /* SSL3_ST_SW_CERT_REQ_B */
1106         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1107 err:
1108         return(-1);
1109         }
1110
1111 int dtls1_send_server_certificate(SSL *s)
1112         {
1113         unsigned long l;
1114         X509 *x;
1115
1116         if (s->state == SSL3_ST_SW_CERT_A)
1117                 {
1118                 x=ssl_get_server_send_cert(s);
1119                 if (x == NULL)
1120                         {
1121                         /* VRS: allow null cert if auth == KRB5 */
1122                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1123                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1124                                 {
1125                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1126                                 return(0);
1127                                 }
1128                         }
1129
1130                 l=dtls1_output_cert_chain(s,x);
1131                 s->state=SSL3_ST_SW_CERT_B;
1132                 s->init_num=(int)l;
1133                 s->init_off=0;
1134
1135                 /* buffer the message to handle re-xmits */
1136                 dtls1_buffer_message(s, 0);
1137                 }
1138
1139         /* SSL3_ST_SW_CERT_B */
1140         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1141         }