ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124
 125 static SSL_METHOD *dtls1_get_server_method(int ver);
 126 static int dtls1_send_hello_verify_request(SSL *s);
 127
 128 static SSL_METHOD *dtls1_get_server_method(int ver)
 129         {
 130         if (ver == DTLS1_VERSION)
 131                 return(DTLSv1_server_method());
 132         else
 133                 return(NULL);
 134         }
 135
 136 SSL_METHOD *DTLSv1_server_method(void)
 137         {
 138         static int init=1;
 139         static SSL_METHOD DTLSv1_server_data;
 140
 141         if (init)
 142                 {
 143                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 144
 145                 if (init)
 146                         {
 147                         memcpy((char *)&DTLSv1_server_data,(char *)dtlsv1_base_method(),
 148                                 sizeof(SSL_METHOD));
 149                         DTLSv1_server_data.ssl_accept=dtls1_accept;
 150                         DTLSv1_server_data.get_ssl_method=dtls1_get_server_method;
 151                         init=0;
 152                         }
 153
 154                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 155                 }
 156         return(&DTLSv1_server_data);
 157         }
 158
 159 int dtls1_accept(SSL *s)
 160         {
 161         BUF_MEM *buf;
 162         unsigned long l,Time=time(NULL);
 163         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 164         long num1;
 165         int ret= -1;
 166         int new_state,state,skip=0;
 167
 168         RAND_add(&Time,sizeof(Time),0);
 169         ERR_clear_error();
 170         clear_sys_error();
 171
 172         if (s->info_callback != NULL)
 173                 cb=s->info_callback;
 174         else if (s->ctx->info_callback != NULL)
 175                 cb=s->ctx->info_callback;
 176
 177         /* init things to blank */
 178         s->in_handshake++;
 179         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 180
 181         if (s->cert == NULL)
 182                 {
 183                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 184                 return(-1);
 185                 }
 186
 187         for (;;)
 188                 {
 189                 state=s->state;
 190
 191                 switch (s->state)
 192                         {
 193                 case SSL_ST_RENEGOTIATE:
 194                         s->new_session=1;
 195                         /* s->state=SSL_ST_ACCEPT; */
 196
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_ACCEPT:
 199                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 200                 case SSL_ST_OK|SSL_ST_ACCEPT:
 201
 202                         s->server=1;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 206                                 {
 207                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 208                                 return -1;
 209                                 }
 210                         s->type=SSL_ST_ACCEPT;
 211
 212                         if (s->init_buf == NULL)
 213                                 {
 214                                 if ((buf=BUF_MEM_new()) == NULL)
 215                                         {
 216                                         ret= -1;
 217                                         goto end;
 218                                         }
 219                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 s->init_buf=buf;
 225                                 }
 226
 227                         if (!ssl3_setup_buffers(s))
 228                                 {
 229                                 ret= -1;
 230                                 goto end;
 231                                 }
 232
 233                         s->init_num=0;
 234
 235                         if (s->state != SSL_ST_RENEGOTIATE)
 236                                 {
 237                                 /* Ok, we now need to push on a buffering BIO so that
 238                                  * the output is sent in a way that TCP likes :-)
 239                                  */
 240                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 241
 242                                 ssl3_init_finished_mac(s);
 243                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 244                                 s->ctx->stats.sess_accept++;
 245                                 }
 246                         else
 247                                 {
 248                                 /* s->state == SSL_ST_RENEGOTIATE,
 249                                  * we will just send a HelloRequest */
 250                                 s->ctx->stats.sess_accept_renegotiate++;
 251                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 252                                 }
 253
 254             if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 255                 s->d1->send_cookie = 1;
 256             else
 257                 s->d1->send_cookie = 0;
 258
 259                         break;
 260
 261                 case SSL3_ST_SW_HELLO_REQ_A:
 262                 case SSL3_ST_SW_HELLO_REQ_B:
 263
 264                         s->shutdown=0;
 265                         ret=dtls1_send_hello_request(s);
 266                         if (ret <= 0) goto end;
 267                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 268                         s->state=SSL3_ST_SW_FLUSH;
 269                         s->init_num=0;
 270
 271                         ssl3_init_finished_mac(s);
 272                         break;
 273
 274                 case SSL3_ST_SW_HELLO_REQ_C:
 275                         s->state=SSL_ST_OK;
 276                         break;
 277
 278                 case SSL3_ST_SR_CLNT_HELLO_A:
 279                 case SSL3_ST_SR_CLNT_HELLO_B:
 280                 case SSL3_ST_SR_CLNT_HELLO_C:
 281
 282                         s->shutdown=0;
 283                         ret=ssl3_get_client_hello(s);
 284                         if (ret <= 0) goto end;
 285                         s->new_session = 2;
 286
 287                         if ( s->d1->send_cookie)
 288                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 289                         else
 290                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 291
 292                         s->init_num=0;
 293                         break;
 294
 295                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 296                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 297
 298                         ret = dtls1_send_hello_verify_request(s);
 299                         if ( ret <= 0) goto end;
 300                         s->d1->send_cookie = 0;
 301                         s->state=SSL3_ST_SW_FLUSH;
 302                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 303                         break;
 304
 305                 case SSL3_ST_SW_SRVR_HELLO_A:
 306                 case SSL3_ST_SW_SRVR_HELLO_B:
 307                         ret=dtls1_send_server_hello(s);
 308                         if (ret <= 0) goto end;
 309
 310                         if (s->hit)
 311                                 s->state=SSL3_ST_SW_CHANGE_A;
 312                         else
 313                                 s->state=SSL3_ST_SW_CERT_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_SW_CERT_A:
 318                 case SSL3_ST_SW_CERT_B:
 319                         /* Check if it is anon DH */
 320                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 321                                 {
 322                                 ret=dtls1_send_server_certificate(s);
 323                                 if (ret <= 0) goto end;
 324                                 }
 325                         else
 326                                 skip=1;
 327                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 328                         s->init_num=0;
 329                         break;
 330
 331                 case SSL3_ST_SW_KEY_EXCH_A:
 332                 case SSL3_ST_SW_KEY_EXCH_B:
 333                         l=s->s3->tmp.new_cipher->algorithms;
 334
 335                         /* clear this, it may get reset by
 336                          * send_server_key_exchange */
 337                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 338 #ifndef OPENSSL_NO_KRB5
 339                                 && !(l & SSL_KRB5)
 340 #endif /* OPENSSL_NO_KRB5 */
 341                                 )
 342                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 343                                  * even when forbidden by protocol specs
 344                                  * (handshake may fail as clients are not required to
 345                                  * be able to handle this) */
 346                                 s->s3->tmp.use_rsa_tmp=1;
 347                         else
 348                                 s->s3->tmp.use_rsa_tmp=0;
 349
 350                         /* only send if a DH key exchange, fortezza or
 351                          * RSA but we have a sign only certificate */
 352                         if (s->s3->tmp.use_rsa_tmp
 353                             || (l & (SSL_DH|SSL_kFZA))
 354                             || ((l & SSL_kRSA)
 355                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 356                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 357                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 358                                         )
 359                                     )
 360                                 )
 361                             )
 362                                 {
 363                                 ret=dtls1_send_server_key_exchange(s);
 364                                 if (ret <= 0) goto end;
 365                                 }
 366                         else
 367                                 skip=1;
 368
 369                         s->state=SSL3_ST_SW_CERT_REQ_A;
 370                         s->init_num=0;
 371                         break;
 372
 373                 case SSL3_ST_SW_CERT_REQ_A:
 374                 case SSL3_ST_SW_CERT_REQ_B:
 375                         if (/* don't request cert unless asked for it: */
 376                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 377                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 378                                  * don't request cert during re-negotiation: */
 379                                 ((s->session->peer != NULL) &&
 380                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 381                                 /* never request cert in anonymous ciphersuites
 382                                  * (see section "Certificate request" in SSL 3 drafts
 383                                  * and in RFC 2246): */
 384                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 385                                  /* ... except when the application insists on verification
 386                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 387                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 388                                  /* never request cert in Kerberos ciphersuites */
 389                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 390                                 {
 391                                 /* no cert request */
 392                                 skip=1;
 393                                 s->s3->tmp.cert_request=0;
 394                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 395                                 }
 396                         else
 397                                 {
 398                                 s->s3->tmp.cert_request=1;
 399                                 ret=dtls1_send_certificate_request(s);
 400                                 if (ret <= 0) goto end;
 401 #ifndef NETSCAPE_HANG_BUG
 402                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 403 #else
 404                                 s->state=SSL3_ST_SW_FLUSH;
 405                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 406 #endif
 407                                 s->init_num=0;
 408                                 }
 409                         break;
 410
 411                 case SSL3_ST_SW_SRVR_DONE_A:
 412                 case SSL3_ST_SW_SRVR_DONE_B:
 413                         ret=dtls1_send_server_done(s);
 414                         if (ret <= 0) goto end;
 415                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 416                         s->state=SSL3_ST_SW_FLUSH;
 417                         s->init_num=0;
 418                         break;
 419
 420                 case SSL3_ST_SW_FLUSH:
 421                         /* number of bytes to be flushed */
 422                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 423                         if (num1 > 0)
 424                                 {
 425                                 s->rwstate=SSL_WRITING;
 426                                 num1=BIO_flush(s->wbio);
 427                                 if (num1 <= 0) { ret= -1; goto end; }
 428                                 s->rwstate=SSL_NOTHING;
 429                                 }
 430
 431                         s->state=s->s3->tmp.next_state;
 432                         break;
 433
 434                 case SSL3_ST_SR_CERT_A:
 435                 case SSL3_ST_SR_CERT_B:
 436                         /* Check for second client hello (MS SGC) */
 437                         ret = ssl3_check_client_hello(s);
 438                         if (ret <= 0)
 439                                 goto end;
 440                         if (ret == 2)
 441                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 442                         else {
 443                                 /* could be sent for a DH cert, even if we
 444                                  * have not asked for it :-) */
 445                                 ret=ssl3_get_client_certificate(s);
 446                                 if (ret <= 0) goto end;
 447                                 s->init_num=0;
 448                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 449                         }
 450                         break;
 451
 452                 case SSL3_ST_SR_KEY_EXCH_A:
 453                 case SSL3_ST_SR_KEY_EXCH_B:
 454                         ret=ssl3_get_client_key_exchange(s);
 455                         if (ret <= 0) goto end;
 456                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 457                         s->init_num=0;
 458
 459                         /* We need to get hashes here so if there is
 460                          * a client cert, it can be verified */
 461                         s->method->ssl3_enc->cert_verify_mac(s,
 462                                 &(s->s3->finish_dgst1),
 463                                 &(s->s3->tmp.cert_verify_md[0]));
 464                         s->method->ssl3_enc->cert_verify_mac(s,
 465                                 &(s->s3->finish_dgst2),
 466                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 467
 468                         break;
 469
 470                 case SSL3_ST_SR_CERT_VRFY_A:
 471                 case SSL3_ST_SR_CERT_VRFY_B:
 472
 473                         /* we should decide if we expected this one */
 474                         ret=ssl3_get_cert_verify(s);
 475                         if (ret <= 0) goto end;
 476
 477                         s->state=SSL3_ST_SR_FINISHED_A;
 478                         s->init_num=0;
 479                         break;
 480
 481                 case SSL3_ST_SR_FINISHED_A:
 482                 case SSL3_ST_SR_FINISHED_B:
 483                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 484                                 SSL3_ST_SR_FINISHED_B);
 485                         if (ret <= 0) goto end;
 486                         if (s->hit)
 487                                 s->state=SSL_ST_OK;
 488                         else
 489                                 s->state=SSL3_ST_SW_CHANGE_A;
 490                         s->init_num=0;
 491                         break;
 492
 493                 case SSL3_ST_SW_CHANGE_A:
 494                 case SSL3_ST_SW_CHANGE_B:
 495
 496                         s->session->cipher=s->s3->tmp.new_cipher;
 497                         if (!s->method->ssl3_enc->setup_key_block(s))
 498                                 { ret= -1; goto end; }
 499
 500                         ret=dtls1_send_change_cipher_spec(s,
 501                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 502
 503                         if (ret <= 0) goto end;
 504                         s->state=SSL3_ST_SW_FINISHED_A;
 505                         s->init_num=0;
 506
 507                         if (!s->method->ssl3_enc->change_cipher_state(s,
 508                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 509                                 {
 510                                 ret= -1;
 511                                 goto end;
 512                                 }
 513
 514                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 515                         break;
 516
 517                 case SSL3_ST_SW_FINISHED_A:
 518                 case SSL3_ST_SW_FINISHED_B:
 519                         ret=dtls1_send_finished(s,
 520                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 521                                 s->method->ssl3_enc->server_finished_label,
 522                                 s->method->ssl3_enc->server_finished_label_len);
 523                         if (ret <= 0) goto end;
 524                         s->state=SSL3_ST_SW_FLUSH;
 525                         if (s->hit)
 526                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 527                         else
 528                                 s->s3->tmp.next_state=SSL_ST_OK;
 529                         s->init_num=0;
 530                         break;
 531
 532                 case SSL_ST_OK:
 533                         /* clean a few things up */
 534                         ssl3_cleanup_key_block(s);
 535
 536 #if 0
 537                         BUF_MEM_free(s->init_buf);
 538                         s->init_buf=NULL;
 539 #endif
 540
 541                         /* remove buffering on output */
 542                         ssl_free_wbio_buffer(s);
 543
 544                         s->init_num=0;
 545
 546                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 547                                 {
 548                                 /* actually not necessarily a 'new' session unless
 549                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 550
 551                                 s->new_session=0;
 552
 553                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 554
 555                                 s->ctx->stats.sess_accept_good++;
 556                                 /* s->server=1; */
 557                                 s->handshake_func=dtls1_accept;
 558
 559                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 560                                 }
 561
 562                         ret = 1;
 563
 564                         /* done handshaking, next message is client hello */
 565                         s->d1->handshake_read_seq = 0;
 566                         /* next message is server hello */
 567                         s->d1->handshake_write_seq = 0;
 568                         goto end;
 569                         /* break; */
 570
 571                 default:
 572                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 573                         ret= -1;
 574                         goto end;
 575                         /* break; */
 576                         }
 577
 578                 if (!s->s3->tmp.reuse_message && !skip)
 579                         {
 580                         if (s->debug)
 581                                 {
 582                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 583                                         goto end;
 584                                 }
 585
 586
 587                         if ((cb != NULL) && (s->state != state))
 588                                 {
 589                                 new_state=s->state;
 590                                 s->state=state;
 591                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 592                                 s->state=new_state;
 593                                 }
 594                         }
 595                 skip=0;
 596                 }
 597 end:
 598         /* BIO_flush(s->wbio); */
 599
 600         s->in_handshake--;
 601         if (cb != NULL)
 602                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 603         return(ret);
 604         }
 605
 606 int dtls1_send_hello_request(SSL *s)
 607         {
 608         unsigned char *p;
 609
 610         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 611                 {
 612                 p=(unsigned char *)s->init_buf->data;
 613                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 614
 615                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 616                 /* number of bytes to write */
 617                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 618                 s->init_off=0;
 619
 620                 /* no need to buffer this message, since there are no retransmit
 621                  * requests for it */
 622                 }
 623
 624         /* SSL3_ST_SW_HELLO_REQ_B */
 625         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 626         }
 627
 628 int dtls1_send_hello_verify_request(SSL *s)
 629         {
 630         unsigned int msg_len;
 631         unsigned char *msg, *buf, *p;
 632
 633         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 634                 {
 635                 buf = (unsigned char *)s->init_buf->data;
 636
 637                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 638                 *(p++) = s->version >> 8;
 639                 *(p++) = s->version & 0xFF;
 640
 641                 *(p++) = (unsigned char) s->d1->cookie_len;
 642         if ( s->ctx->app_gen_cookie_cb != NULL &&
 643             s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 644                 &(s->d1->cookie_len)) == 0)
 645             {
 646                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 647             return 0;
 648             }
 649         /* else the cookie is assumed to have
 650          * been initialized by the application */
 651
 652                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 653                 p += s->d1->cookie_len;
 654                 msg_len = p - msg;
 655
 656                 dtls1_set_message_header(s, buf,
 657                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 658
 659                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 660                 /* number of bytes to write */
 661                 s->init_num=p-buf;
 662                 s->init_off=0;
 663
 664                 /* buffer the message to handle re-xmits */
 665                 dtls1_buffer_message(s, 0);
 666                 }
 667
 668         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 669         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 670         }
 671
 672 int dtls1_send_server_hello(SSL *s)
 673         {
 674         unsigned char *buf;
 675         unsigned char *p,*d;
 676         int i,sl;
 677         unsigned long l,Time;
 678
 679         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 680                 {
 681                 buf=(unsigned char *)s->init_buf->data;
 682                 p=s->s3->server_random;
 683                 Time=time(NULL);                        /* Time */
 684                 l2n(Time,p);
 685                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 686                 /* Do the message type and length last */
 687                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 688
 689                 *(p++)=s->version>>8;
 690                 *(p++)=s->version&0xff;
 691
 692                 /* Random stuff */
 693                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 694                 p+=SSL3_RANDOM_SIZE;
 695
 696                 /* now in theory we have 3 options to sending back the
 697                  * session id.  If it is a re-use, we send back the
 698                  * old session-id, if it is a new session, we send
 699                  * back the new session-id or we send back a 0 length
 700                  * session-id if we want it to be single use.
 701                  * Currently I will not implement the '0' length session-id
 702                  * 12-Jan-98 - I'll now support the '0' length stuff.
 703                  */
 704                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 705                         s->session->session_id_length=0;
 706
 707                 sl=s->session->session_id_length;
 708                 if (sl > sizeof s->session->session_id)
 709                         {
 710                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 711                         return -1;
 712                         }
 713                 *(p++)=sl;
 714                 memcpy(p,s->session->session_id,sl);
 715                 p+=sl;
 716
 717                 /* put the cipher */
 718                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 719                 p+=i;
 720
 721                 /* put the compression method */
 722                 if (s->s3->tmp.new_compression == NULL)
 723                         *(p++)=0;
 724                 else
 725                         *(p++)=s->s3->tmp.new_compression->id;
 726
 727                 /* do the header */
 728                 l=(p-d);
 729                 d=buf;
 730
 731                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 732
 733                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 734                 /* number of bytes to write */
 735                 s->init_num=p-buf;
 736                 s->init_off=0;
 737
 738                 /* buffer the message to handle re-xmits */
 739                 dtls1_buffer_message(s, 0);
 740                 }
 741
 742         /* SSL3_ST_CW_CLNT_HELLO_B */
 743         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 744         }
 745
 746 int dtls1_send_server_done(SSL *s)
 747         {
 748         unsigned char *p;
 749
 750         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 751                 {
 752                 p=(unsigned char *)s->init_buf->data;
 753
 754                 /* do the header */
 755                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 756
 757                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 758                 /* number of bytes to write */
 759                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 760                 s->init_off=0;
 761
 762                 /* buffer the message to handle re-xmits */
 763                 dtls1_buffer_message(s, 0);
 764                 }
 765
 766         /* SSL3_ST_CW_CLNT_HELLO_B */
 767         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 768         }
 769
 770 int dtls1_send_server_key_exchange(SSL *s)
 771         {
 772 #ifndef OPENSSL_NO_RSA
 773         unsigned char *q;
 774         int j,num;
 775         RSA *rsa;
 776         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 777         unsigned int u;
 778 #endif
 779 #ifndef OPENSSL_NO_DH
 780         DH *dh=NULL,*dhp;
 781 #endif
 782         EVP_PKEY *pkey;
 783         unsigned char *p,*d;
 784         int al,i;
 785         unsigned long type;
 786         int n;
 787         CERT *cert;
 788         BIGNUM *r[4];
 789         int nr[4],kn;
 790         BUF_MEM *buf;
 791         EVP_MD_CTX md_ctx;
 792
 793         EVP_MD_CTX_init(&md_ctx);
 794         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 795                 {
 796                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 797                 cert=s->cert;
 798
 799                 buf=s->init_buf;
 800
 801                 r[0]=r[1]=r[2]=r[3]=NULL;
 802                 n=0;
 803 #ifndef OPENSSL_NO_RSA
 804                 if (type & SSL_kRSA)
 805                         {
 806                         rsa=cert->rsa_tmp;
 807                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 808                                 {
 809                                 rsa=s->cert->rsa_tmp_cb(s,
 810                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 811                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 812                                 if(rsa == NULL)
 813                                 {
 814                                         al=SSL_AD_HANDSHAKE_FAILURE;
 815                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 816                                         goto f_err;
 817                                 }
 818                                 RSA_up_ref(rsa);
 819                                 cert->rsa_tmp=rsa;
 820                                 }
 821                         if (rsa == NULL)
 822                                 {
 823                                 al=SSL_AD_HANDSHAKE_FAILURE;
 824                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 825                                 goto f_err;
 826                                 }
 827                         r[0]=rsa->n;
 828                         r[1]=rsa->e;
 829                         s->s3->tmp.use_rsa_tmp=1;
 830                         }
 831                 else
 832 #endif
 833 #ifndef OPENSSL_NO_DH
 834                         if (type & SSL_kEDH)
 835                         {
 836                         dhp=cert->dh_tmp;
 837                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 838                                 dhp=s->cert->dh_tmp_cb(s,
 839                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 840                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 841                         if (dhp == NULL)
 842                                 {
 843                                 al=SSL_AD_HANDSHAKE_FAILURE;
 844                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 845                                 goto f_err;
 846                                 }
 847
 848                         if (s->s3->tmp.dh != NULL)
 849                                 {
 850                                 DH_free(dh);
 851                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 852                                 goto err;
 853                                 }
 854
 855                         if ((dh=DHparams_dup(dhp)) == NULL)
 856                                 {
 857                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 858                                 goto err;
 859                                 }
 860
 861                         s->s3->tmp.dh=dh;
 862                         if ((dhp->pub_key == NULL ||
 863                              dhp->priv_key == NULL ||
 864                              (s->options & SSL_OP_SINGLE_DH_USE)))
 865                                 {
 866                                 if(!DH_generate_key(dh))
 867                                     {
 868                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 869                                            ERR_R_DH_LIB);
 870                                     goto err;
 871                                     }
 872                                 }
 873                         else
 874                                 {
 875                                 dh->pub_key=BN_dup(dhp->pub_key);
 876                                 dh->priv_key=BN_dup(dhp->priv_key);
 877                                 if ((dh->pub_key == NULL) ||
 878                                         (dh->priv_key == NULL))
 879                                         {
 880                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 881                                         goto err;
 882                                         }
 883                                 }
 884                         r[0]=dh->p;
 885                         r[1]=dh->g;
 886                         r[2]=dh->pub_key;
 887                         }
 888                 else
 889 #endif
 890                         {
 891                         al=SSL_AD_HANDSHAKE_FAILURE;
 892                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 893                         goto f_err;
 894                         }
 895                 for (i=0; r[i] != NULL; i++)
 896                         {
 897                         nr[i]=BN_num_bytes(r[i]);
 898                         n+=2+nr[i];
 899                         }
 900
 901                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 902                         {
 903                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 904                                 == NULL)
 905                                 {
 906                                 al=SSL_AD_DECODE_ERROR;
 907                                 goto f_err;
 908                                 }
 909                         kn=EVP_PKEY_size(pkey);
 910                         }
 911                 else
 912                         {
 913                         pkey=NULL;
 914                         kn=0;
 915                         }
 916
 917                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 918                         {
 919                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 920                         goto err;
 921                         }
 922                 d=(unsigned char *)s->init_buf->data;
 923                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 924
 925                 for (i=0; r[i] != NULL; i++)
 926                         {
 927                         s2n(nr[i],p);
 928                         BN_bn2bin(r[i],p);
 929                         p+=nr[i];
 930                         }
 931
 932                 /* not anonymous */
 933                 if (pkey != NULL)
 934                         {
 935                         /* n is the length of the params, they start at
 936                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 937                          * at the end. */
 938 #ifndef OPENSSL_NO_RSA
 939                         if (pkey->type == EVP_PKEY_RSA)
 940                                 {
 941                                 q=md_buf;
 942                                 j=0;
 943                                 for (num=2; num > 0; num--)
 944                                         {
 945                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 946                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 947                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 948                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 949                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 950                                         EVP_DigestFinal_ex(&md_ctx,q,
 951                                                 (unsigned int *)&i);
 952                                         q+=i;
 953                                         j+=i;
 954                                         }
 955                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 956                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 957                                         {
 958                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 959                                         goto err;
 960                                         }
 961                                 s2n(u,p);
 962                                 n+=u+2;
 963                                 }
 964                         else
 965 #endif
 966 #if !defined(OPENSSL_NO_DSA)
 967                                 if (pkey->type == EVP_PKEY_DSA)
 968                                 {
 969                                 /* lets do DSS */
 970                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 971                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 972                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 973                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 974                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 975                                         (unsigned int *)&i,pkey))
 976                                         {
 977                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 978                                         goto err;
 979                                         }
 980                                 s2n(i,p);
 981                                 n+=i+2;
 982                                 }
 983                         else
 984 #endif
 985                                 {
 986                                 /* Is this error check actually needed? */
 987                                 al=SSL_AD_HANDSHAKE_FAILURE;
 988                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 989                                 goto f_err;
 990                                 }
 991                         }
 992
 993                 d = dtls1_set_message_header(s, d,
 994                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 995
 996                 /* we should now have things packed up, so lets send
 997                  * it off */
 998                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 999                 s->init_off=0;
1000
1001                 /* buffer the message to handle re-xmits */
1002                 dtls1_buffer_message(s, 0);
1003                 }
1004
1005         s->state = SSL3_ST_SW_KEY_EXCH_B;
1006         EVP_MD_CTX_cleanup(&md_ctx);
1007         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1008 f_err:
1009         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1010 err:
1011         EVP_MD_CTX_cleanup(&md_ctx);
1012         return(-1);
1013         }
1014
1015 int dtls1_send_certificate_request(SSL *s)
1016         {
1017         unsigned char *p,*d;
1018         int i,j,nl,off,n;
1019         STACK_OF(X509_NAME) *sk=NULL;
1020         X509_NAME *name;
1021         BUF_MEM *buf;
1022
1023         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1024                 {
1025                 buf=s->init_buf;
1026
1027                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1028
1029                 /* get the list of acceptable cert types */
1030                 p++;
1031                 n=ssl3_get_req_cert_type(s,p);
1032                 d[0]=n;
1033                 p+=n;
1034                 n++;
1035
1036                 off=n;
1037                 p+=2;
1038                 n+=2;
1039
1040                 sk=SSL_get_client_CA_list(s);
1041                 nl=0;
1042                 if (sk != NULL)
1043                         {
1044                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1045                                 {
1046                                 name=sk_X509_NAME_value(sk,i);
1047                                 j=i2d_X509_NAME(name,NULL);
1048                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1049                                         {
1050                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1051                                         goto err;
1052                                         }
1053                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1054                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1055                                         {
1056                                         s2n(j,p);
1057                                         i2d_X509_NAME(name,&p);
1058                                         n+=2+j;
1059                                         nl+=2+j;
1060                                         }
1061                                 else
1062                                         {
1063                                         d=p;
1064                                         i2d_X509_NAME(name,&p);
1065                                         j-=2; s2n(j,d); j+=2;
1066                                         n+=j;
1067                                         nl+=j;
1068                                         }
1069                                 }
1070                         }
1071                 /* else no CA names */
1072                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1073                 s2n(nl,p);
1074
1075                 d=(unsigned char *)buf->data;
1076                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1077                 l2n3(n,d);
1078                 s2n(s->d1->handshake_write_seq,d);
1079                 s->d1->handshake_write_seq++;
1080
1081                 /* we should now have things packed up, so lets send
1082                  * it off */
1083
1084                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1085                 s->init_off=0;
1086 #ifdef NETSCAPE_HANG_BUG
1087 /* XXX: what to do about this? */
1088                 p=(unsigned char *)s->init_buf->data + s->init_num;
1089
1090                 /* do the header */
1091                 *(p++)=SSL3_MT_SERVER_DONE;
1092                 *(p++)=0;
1093                 *(p++)=0;
1094                 *(p++)=0;
1095                 s->init_num += 4;
1096 #endif
1097
1098                 /* XDTLS:  set message header ? */
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                         /* VRS: allow null cert if auth == KRB5 */
1121                         (s->s3->tmp.new_cipher->algorithms
1122                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1123                         != (SSL_aKRB5|SSL_kKRB5))
1124                         {
1125                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1126                         return(0);
1127                         }
1128
1129                 l=dtls1_output_cert_chain(s,x);
1130                 s->state=SSL3_ST_SW_CERT_B;
1131                 s->init_num=(int)l;
1132                 s->init_off=0;
1133
1134                 /* buffer the message to handle re-xmits */
1135                 dtls1_buffer_message(s, 0);
1136                 }
1137
1138         /* SSL3_ST_SW_CERT_B */
1139         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1140         }