ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_server_method(int ver);
 129 static int dtls1_send_hello_verify_request(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_server_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_server_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 140                         dtls1_accept,
 141                         ssl_undefined_function,
 142                         dtls1_get_server_method)
 143
 144 int dtls1_accept(SSL *s)
 145         {
 146         BUF_MEM *buf;
 147         unsigned long l,Time=(unsigned long)time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         long num1;
 150         int ret= -1;
 151         int new_state,state,skip=0;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         /* init things to blank */
 163         s->in_handshake++;
 164         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 165
 166         if (s->cert == NULL)
 167                 {
 168                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 169                 return(-1);
 170                 }
 171
 172         for (;;)
 173                 {
 174                 state=s->state;
 175
 176                 switch (s->state)
 177                         {
 178                 case SSL_ST_RENEGOTIATE:
 179                         s->new_session=1;
 180                         /* s->state=SSL_ST_ACCEPT; */
 181
 182                 case SSL_ST_BEFORE:
 183                 case SSL_ST_ACCEPT:
 184                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 185                 case SSL_ST_OK|SSL_ST_ACCEPT:
 186
 187                         s->server=1;
 188                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 189
 190                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 191                                 {
 192                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 193                                 return -1;
 194                                 }
 195                         s->type=SSL_ST_ACCEPT;
 196
 197                         if (s->init_buf == NULL)
 198                                 {
 199                                 if ((buf=BUF_MEM_new()) == NULL)
 200                                         {
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 205                                         {
 206                                         ret= -1;
 207                                         goto end;
 208                                         }
 209                                 s->init_buf=buf;
 210                                 }
 211
 212                         if (!ssl3_setup_buffers(s))
 213                                 {
 214                                 ret= -1;
 215                                 goto end;
 216                                 }
 217
 218                         s->init_num=0;
 219
 220                         if (s->state != SSL_ST_RENEGOTIATE)
 221                                 {
 222                                 /* Ok, we now need to push on a buffering BIO so that
 223                                  * the output is sent in a way that TCP likes :-)
 224                                  */
 225                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 226
 227                                 ssl3_init_finished_mac(s);
 228                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 229                                 s->ctx->stats.sess_accept++;
 230                                 }
 231                         else
 232                                 {
 233                                 /* s->state == SSL_ST_RENEGOTIATE,
 234                                  * we will just send a HelloRequest */
 235                                 s->ctx->stats.sess_accept_renegotiate++;
 236                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 237                                 }
 238
 239             if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 240                 s->d1->send_cookie = 1;
 241             else
 242                 s->d1->send_cookie = 0;
 243
 244                         break;
 245
 246                 case SSL3_ST_SW_HELLO_REQ_A:
 247                 case SSL3_ST_SW_HELLO_REQ_B:
 248
 249                         s->shutdown=0;
 250                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 251                         ret=dtls1_send_hello_request(s);
 252                         if (ret <= 0) goto end;
 253                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 254                         s->state=SSL3_ST_SW_FLUSH;
 255                         s->init_num=0;
 256
 257                         ssl3_init_finished_mac(s);
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_C:
 261                         s->state=SSL_ST_OK;
 262                         break;
 263
 264                 case SSL3_ST_SR_CLNT_HELLO_A:
 265                 case SSL3_ST_SR_CLNT_HELLO_B:
 266                 case SSL3_ST_SR_CLNT_HELLO_C:
 267
 268                         s->shutdown=0;
 269                         ret=ssl3_get_client_hello(s);
 270                         if (ret <= 0) goto end;
 271                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 286                         ret = dtls1_send_hello_verify_request(s);
 287                         if ( ret <= 0) goto end;
 288                         s->d1->send_cookie = 0;
 289                         s->state=SSL3_ST_SW_FLUSH;
 290                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 291
 292                         /* HelloVerifyRequests resets Finished MAC */
 293                         if (s->client_version != DTLS1_BAD_VER)
 294                                 ssl3_init_finished_mac(s);
 295                         break;
 296
 297                 case SSL3_ST_SW_SRVR_HELLO_A:
 298                 case SSL3_ST_SW_SRVR_HELLO_B:
 299                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 300                         ret=dtls1_send_server_hello(s);
 301                         if (ret <= 0) goto end;
 302
 303                         if (s->hit)
 304                                 s->state=SSL3_ST_SW_CHANGE_A;
 305                         else
 306                                 s->state=SSL3_ST_SW_CERT_A;
 307                         s->init_num=0;
 308                         break;
 309
 310                 case SSL3_ST_SW_CERT_A:
 311                 case SSL3_ST_SW_CERT_B:
 312                         /* Check if it is anon DH */
 313                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 314                                 {
 315                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 316                                 ret=dtls1_send_server_certificate(s);
 317                                 if (ret <= 0) goto end;
 318                                 }
 319                         else
 320                                 skip=1;
 321                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_SW_KEY_EXCH_A:
 326                 case SSL3_ST_SW_KEY_EXCH_B:
 327                         l=s->s3->tmp.new_cipher->algorithms;
 328
 329                         /* clear this, it may get reset by
 330                          * send_server_key_exchange */
 331                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 332 #ifndef OPENSSL_NO_KRB5
 333                                 && !(l & SSL_KRB5)
 334 #endif /* OPENSSL_NO_KRB5 */
 335                                 )
 336                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 337                                  * even when forbidden by protocol specs
 338                                  * (handshake may fail as clients are not required to
 339                                  * be able to handle this) */
 340                                 s->s3->tmp.use_rsa_tmp=1;
 341                         else
 342                                 s->s3->tmp.use_rsa_tmp=0;
 343
 344                         /* only send if a DH key exchange, fortezza or
 345                          * RSA but we have a sign only certificate */
 346                         if (s->s3->tmp.use_rsa_tmp
 347                             || (l & (SSL_DH|SSL_kFZA))
 348                             || ((l & SSL_kRSA)
 349                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 350                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 351                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 352                                         )
 353                                     )
 354                                 )
 355                             )
 356                                 {
 357                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 358                                 ret=dtls1_send_server_key_exchange(s);
 359                                 if (ret <= 0) goto end;
 360                                 }
 361                         else
 362                                 skip=1;
 363
 364                         s->state=SSL3_ST_SW_CERT_REQ_A;
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_SW_CERT_REQ_A:
 369                 case SSL3_ST_SW_CERT_REQ_B:
 370                         if (/* don't request cert unless asked for it: */
 371                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 372                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 373                                  * don't request cert during re-negotiation: */
 374                                 ((s->session->peer != NULL) &&
 375                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 376                                 /* never request cert in anonymous ciphersuites
 377                                  * (see section "Certificate request" in SSL 3 drafts
 378                                  * and in RFC 2246): */
 379                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 380                                  /* ... except when the application insists on verification
 381                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 382                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 383                                  /* never request cert in Kerberos ciphersuites */
 384                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 385                                 {
 386                                 /* no cert request */
 387                                 skip=1;
 388                                 s->s3->tmp.cert_request=0;
 389                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 390                                 }
 391                         else
 392                                 {
 393                                 s->s3->tmp.cert_request=1;
 394                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 395                                 ret=dtls1_send_certificate_request(s);
 396                                 if (ret <= 0) goto end;
 397 #ifndef NETSCAPE_HANG_BUG
 398                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 399 #else
 400                                 s->state=SSL3_ST_SW_FLUSH;
 401                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 402 #endif
 403                                 s->init_num=0;
 404                                 }
 405                         break;
 406
 407                 case SSL3_ST_SW_SRVR_DONE_A:
 408                 case SSL3_ST_SW_SRVR_DONE_B:
 409                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 410                         ret=dtls1_send_server_done(s);
 411                         if (ret <= 0) goto end;
 412                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 413                         s->state=SSL3_ST_SW_FLUSH;
 414                         s->init_num=0;
 415                         break;
 416
 417                 case SSL3_ST_SW_FLUSH:
 418                         /* number of bytes to be flushed */
 419                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 420                         if (num1 > 0)
 421                                 {
 422                                 s->rwstate=SSL_WRITING;
 423                                 num1=BIO_flush(s->wbio);
 424                                 if (num1 <= 0) { ret= -1; goto end; }
 425                                 s->rwstate=SSL_NOTHING;
 426                                 }
 427
 428                         s->state=s->s3->tmp.next_state;
 429                         break;
 430
 431                 case SSL3_ST_SR_CERT_A:
 432                 case SSL3_ST_SR_CERT_B:
 433                         /* Check for second client hello (MS SGC) */
 434                         ret = ssl3_check_client_hello(s);
 435                         if (ret <= 0)
 436                                 goto end;
 437                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 438                         if (ret == 2)
 439                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 440                         else {
 441                                 /* could be sent for a DH cert, even if we
 442                                  * have not asked for it :-) */
 443                                 ret=ssl3_get_client_certificate(s);
 444                                 if (ret <= 0) goto end;
 445                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 446                                 s->init_num=0;
 447                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 448                         }
 449                         break;
 450
 451                 case SSL3_ST_SR_KEY_EXCH_A:
 452                 case SSL3_ST_SR_KEY_EXCH_B:
 453                         ret=ssl3_get_client_key_exchange(s);
 454                         if (ret <= 0) goto end;
 455                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 477
 478                         s->state=SSL3_ST_SR_FINISHED_A;
 479                         s->init_num=0;
 480                         break;
 481
 482                 case SSL3_ST_SR_FINISHED_A:
 483                 case SSL3_ST_SR_FINISHED_B:
 484                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 485                                 SSL3_ST_SR_FINISHED_B);
 486                         if (ret <= 0) goto end;
 487                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 488                         if (s->hit)
 489                                 s->state=SSL_ST_OK;
 490                         else
 491                                 s->state=SSL3_ST_SW_CHANGE_A;
 492                         s->init_num=0;
 493                         break;
 494
 495                 case SSL3_ST_SW_CHANGE_A:
 496                 case SSL3_ST_SW_CHANGE_B:
 497
 498                         s->session->cipher=s->s3->tmp.new_cipher;
 499                         if (!s->method->ssl3_enc->setup_key_block(s))
 500                                 { ret= -1; goto end; }
 501
 502                         ret=dtls1_send_change_cipher_spec(s,
 503                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 504
 505                         if (ret <= 0) goto end;
 506                         s->state=SSL3_ST_SW_FINISHED_A;
 507                         s->init_num=0;
 508
 509                         if (!s->method->ssl3_enc->change_cipher_state(s,
 510                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 511                                 {
 512                                 ret= -1;
 513                                 goto end;
 514                                 }
 515
 516                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 517                         break;
 518
 519                 case SSL3_ST_SW_FINISHED_A:
 520                 case SSL3_ST_SW_FINISHED_B:
 521                         ret=dtls1_send_finished(s,
 522                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 523                                 s->method->ssl3_enc->server_finished_label,
 524                                 s->method->ssl3_enc->server_finished_label_len);
 525                         if (ret <= 0) goto end;
 526                         s->state=SSL3_ST_SW_FLUSH;
 527                         if (s->hit)
 528                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 529                         else
 530                                 s->s3->tmp.next_state=SSL_ST_OK;
 531                         s->init_num=0;
 532                         break;
 533
 534                 case SSL_ST_OK:
 535                         /* clean a few things up */
 536                         ssl3_cleanup_key_block(s);
 537
 538 #if 0
 539                         BUF_MEM_free(s->init_buf);
 540                         s->init_buf=NULL;
 541 #endif
 542
 543                         /* remove buffering on output */
 544                         ssl_free_wbio_buffer(s);
 545
 546                         s->init_num=0;
 547
 548                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 549                                 {
 550                                 /* actually not necessarily a 'new' session unless
 551                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 552
 553                                 s->new_session=0;
 554
 555                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 556
 557                                 s->ctx->stats.sess_accept_good++;
 558                                 /* s->server=1; */
 559                                 s->handshake_func=dtls1_accept;
 560
 561                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 562                                 }
 563
 564                         ret = 1;
 565
 566                         /* done handshaking, next message is client hello */
 567                         s->d1->handshake_read_seq = 0;
 568                         /* next message is server hello */
 569                         s->d1->handshake_write_seq = 0;
 570                         s->d1->next_handshake_write_seq = 0;
 571                         goto end;
 572                         /* break; */
 573
 574                 default:
 575                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 576                         ret= -1;
 577                         goto end;
 578                         /* break; */
 579                         }
 580
 581                 if (!s->s3->tmp.reuse_message && !skip)
 582                         {
 583                         if (s->debug)
 584                                 {
 585                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 586                                         goto end;
 587                                 }
 588
 589
 590                         if ((cb != NULL) && (s->state != state))
 591                                 {
 592                                 new_state=s->state;
 593                                 s->state=state;
 594                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 595                                 s->state=new_state;
 596                                 }
 597                         }
 598                 skip=0;
 599                 }
 600 end:
 601         /* BIO_flush(s->wbio); */
 602
 603         s->in_handshake--;
 604         if (cb != NULL)
 605                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 606         return(ret);
 607         }
 608
 609 int dtls1_send_hello_request(SSL *s)
 610         {
 611         unsigned char *p;
 612
 613         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 614                 {
 615                 p=(unsigned char *)s->init_buf->data;
 616                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 617
 618                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 619                 /* number of bytes to write */
 620                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 621                 s->init_off=0;
 622
 623                 /* no need to buffer this message, since there are no retransmit
 624                  * requests for it */
 625                 }
 626
 627         /* SSL3_ST_SW_HELLO_REQ_B */
 628         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 629         }
 630
 631 int dtls1_send_hello_verify_request(SSL *s)
 632         {
 633         unsigned int msg_len;
 634         unsigned char *msg, *buf, *p;
 635
 636         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 637                 {
 638                 buf = (unsigned char *)s->init_buf->data;
 639
 640                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 641                 if (s->client_version == DTLS1_BAD_VER)
 642                         *(p++) = DTLS1_BAD_VER>>8,
 643                         *(p++) = DTLS1_BAD_VER&0xff;
 644                 else
 645                         *(p++) = s->version >> 8,
 646                         *(p++) = s->version & 0xFF;
 647
 648                 if (s->ctx->app_gen_cookie_cb != NULL &&
 649                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 650                     &(s->d1->cookie_len)) == 0)
 651                         {
 652                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 653                         return 0;
 654                         }
 655                 /* else the cookie is assumed to have
 656                  * been initialized by the application */
 657
 658                 *(p++) = (unsigned char) s->d1->cookie_len;
 659                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 660                 p += s->d1->cookie_len;
 661                 msg_len = p - msg;
 662
 663                 dtls1_set_message_header(s, buf,
 664                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 665
 666                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 667                 /* number of bytes to write */
 668                 s->init_num=p-buf;
 669                 s->init_off=0;
 670
 671                 /* buffer the message to handle re-xmits */
 672                 dtls1_buffer_message(s, 0);
 673                 }
 674
 675         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 676         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 677         }
 678
 679 int dtls1_send_server_hello(SSL *s)
 680         {
 681         unsigned char *buf;
 682         unsigned char *p,*d;
 683         int i;
 684         unsigned int sl;
 685         unsigned long l,Time;
 686
 687         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 688                 {
 689                 buf=(unsigned char *)s->init_buf->data;
 690                 p=s->s3->server_random;
 691                 Time=(unsigned long)time(NULL);                 /* Time */
 692                 l2n(Time,p);
 693                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 694                 /* Do the message type and length last */
 695                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 696
 697                 if (s->client_version == DTLS1_BAD_VER)
 698                         *(p++)=DTLS1_BAD_VER>>8,
 699                         *(p++)=DTLS1_BAD_VER&0xff;
 700                 else
 701                         *(p++)=s->version>>8,
 702                         *(p++)=s->version&0xff;
 703
 704                 /* Random stuff */
 705                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 706                 p+=SSL3_RANDOM_SIZE;
 707
 708                 /* now in theory we have 3 options to sending back the
 709                  * session id.  If it is a re-use, we send back the
 710                  * old session-id, if it is a new session, we send
 711                  * back the new session-id or we send back a 0 length
 712                  * session-id if we want it to be single use.
 713                  * Currently I will not implement the '0' length session-id
 714                  * 12-Jan-98 - I'll now support the '0' length stuff.
 715                  */
 716                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 717                         s->session->session_id_length=0;
 718
 719                 sl=s->session->session_id_length;
 720                 if (sl > sizeof s->session->session_id)
 721                         {
 722                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 723                         return -1;
 724                         }
 725                 *(p++)=sl;
 726                 memcpy(p,s->session->session_id,sl);
 727                 p+=sl;
 728
 729                 /* put the cipher */
 730                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 731                 p+=i;
 732
 733                 /* put the compression method */
 734 #ifdef OPENSSL_NO_COMP
 735                 *(p++)=0;
 736 #else
 737                 if (s->s3->tmp.new_compression == NULL)
 738                         *(p++)=0;
 739                 else
 740                         *(p++)=s->s3->tmp.new_compression->id;
 741 #endif
 742
 743                 /* do the header */
 744                 l=(p-d);
 745                 d=buf;
 746
 747                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 748
 749                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 750                 /* number of bytes to write */
 751                 s->init_num=p-buf;
 752                 s->init_off=0;
 753
 754                 /* buffer the message to handle re-xmits */
 755                 dtls1_buffer_message(s, 0);
 756                 }
 757
 758         /* SSL3_ST_SW_SRVR_HELLO_B */
 759         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 760         }
 761
 762 int dtls1_send_server_done(SSL *s)
 763         {
 764         unsigned char *p;
 765
 766         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 767                 {
 768                 p=(unsigned char *)s->init_buf->data;
 769
 770                 /* do the header */
 771                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 772
 773                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 774                 /* number of bytes to write */
 775                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 776                 s->init_off=0;
 777
 778                 /* buffer the message to handle re-xmits */
 779                 dtls1_buffer_message(s, 0);
 780                 }
 781
 782         /* SSL3_ST_SW_SRVR_DONE_B */
 783         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 784         }
 785
 786 int dtls1_send_server_key_exchange(SSL *s)
 787         {
 788 #ifndef OPENSSL_NO_RSA
 789         unsigned char *q;
 790         int j,num;
 791         RSA *rsa;
 792         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 793         unsigned int u;
 794 #endif
 795 #ifndef OPENSSL_NO_DH
 796         DH *dh=NULL,*dhp;
 797 #endif
 798         EVP_PKEY *pkey;
 799         unsigned char *p,*d;
 800         int al,i;
 801         unsigned long type;
 802         int n;
 803         CERT *cert;
 804         BIGNUM *r[4];
 805         int nr[4],kn;
 806         BUF_MEM *buf;
 807         EVP_MD_CTX md_ctx;
 808
 809         EVP_MD_CTX_init(&md_ctx);
 810         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 811                 {
 812                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 813                 cert=s->cert;
 814
 815                 buf=s->init_buf;
 816
 817                 r[0]=r[1]=r[2]=r[3]=NULL;
 818                 n=0;
 819 #ifndef OPENSSL_NO_RSA
 820                 if (type & SSL_kRSA)
 821                         {
 822                         rsa=cert->rsa_tmp;
 823                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 824                                 {
 825                                 rsa=s->cert->rsa_tmp_cb(s,
 826                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 827                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 828                                 if(rsa == NULL)
 829                                 {
 830                                         al=SSL_AD_HANDSHAKE_FAILURE;
 831                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 832                                         goto f_err;
 833                                 }
 834                                 RSA_up_ref(rsa);
 835                                 cert->rsa_tmp=rsa;
 836                                 }
 837                         if (rsa == NULL)
 838                                 {
 839                                 al=SSL_AD_HANDSHAKE_FAILURE;
 840                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 841                                 goto f_err;
 842                                 }
 843                         r[0]=rsa->n;
 844                         r[1]=rsa->e;
 845                         s->s3->tmp.use_rsa_tmp=1;
 846                         }
 847                 else
 848 #endif
 849 #ifndef OPENSSL_NO_DH
 850                         if (type & SSL_kEDH)
 851                         {
 852                         dhp=cert->dh_tmp;
 853                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 854                                 dhp=s->cert->dh_tmp_cb(s,
 855                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 856                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 857                         if (dhp == NULL)
 858                                 {
 859                                 al=SSL_AD_HANDSHAKE_FAILURE;
 860                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 861                                 goto f_err;
 862                                 }
 863
 864                         if (s->s3->tmp.dh != NULL)
 865                                 {
 866                                 DH_free(dh);
 867                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 868                                 goto err;
 869                                 }
 870
 871                         if ((dh=DHparams_dup(dhp)) == NULL)
 872                                 {
 873                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 874                                 goto err;
 875                                 }
 876
 877                         s->s3->tmp.dh=dh;
 878                         if ((dhp->pub_key == NULL ||
 879                              dhp->priv_key == NULL ||
 880                              (s->options & SSL_OP_SINGLE_DH_USE)))
 881                                 {
 882                                 if(!DH_generate_key(dh))
 883                                     {
 884                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 885                                            ERR_R_DH_LIB);
 886                                     goto err;
 887                                     }
 888                                 }
 889                         else
 890                                 {
 891                                 dh->pub_key=BN_dup(dhp->pub_key);
 892                                 dh->priv_key=BN_dup(dhp->priv_key);
 893                                 if ((dh->pub_key == NULL) ||
 894                                         (dh->priv_key == NULL))
 895                                         {
 896                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 897                                         goto err;
 898                                         }
 899                                 }
 900                         r[0]=dh->p;
 901                         r[1]=dh->g;
 902                         r[2]=dh->pub_key;
 903                         }
 904                 else
 905 #endif
 906                         {
 907                         al=SSL_AD_HANDSHAKE_FAILURE;
 908                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 909                         goto f_err;
 910                         }
 911                 for (i=0; r[i] != NULL; i++)
 912                         {
 913                         nr[i]=BN_num_bytes(r[i]);
 914                         n+=2+nr[i];
 915                         }
 916
 917                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 918                         {
 919                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 920                                 == NULL)
 921                                 {
 922                                 al=SSL_AD_DECODE_ERROR;
 923                                 goto f_err;
 924                                 }
 925                         kn=EVP_PKEY_size(pkey);
 926                         }
 927                 else
 928                         {
 929                         pkey=NULL;
 930                         kn=0;
 931                         }
 932
 933                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 934                         {
 935                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 936                         goto err;
 937                         }
 938                 d=(unsigned char *)s->init_buf->data;
 939                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 940
 941                 for (i=0; r[i] != NULL; i++)
 942                         {
 943                         s2n(nr[i],p);
 944                         BN_bn2bin(r[i],p);
 945                         p+=nr[i];
 946                         }
 947
 948                 /* not anonymous */
 949                 if (pkey != NULL)
 950                         {
 951                         /* n is the length of the params, they start at
 952                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 953                          * at the end. */
 954 #ifndef OPENSSL_NO_RSA
 955                         if (pkey->type == EVP_PKEY_RSA)
 956                                 {
 957                                 q=md_buf;
 958                                 j=0;
 959                                 for (num=2; num > 0; num--)
 960                                         {
 961                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 962                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 963                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 964                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 965                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 966                                         EVP_DigestFinal_ex(&md_ctx,q,
 967                                                 (unsigned int *)&i);
 968                                         q+=i;
 969                                         j+=i;
 970                                         }
 971                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 972                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 973                                         {
 974                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 975                                         goto err;
 976                                         }
 977                                 s2n(u,p);
 978                                 n+=u+2;
 979                                 }
 980                         else
 981 #endif
 982 #if !defined(OPENSSL_NO_DSA)
 983                                 if (pkey->type == EVP_PKEY_DSA)
 984                                 {
 985                                 /* lets do DSS */
 986                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 987                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 988                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 989                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 990                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 991                                         (unsigned int *)&i,pkey))
 992                                         {
 993                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 994                                         goto err;
 995                                         }
 996                                 s2n(i,p);
 997                                 n+=i+2;
 998                                 }
 999                         else
1000 #endif
1001                                 {
1002                                 /* Is this error check actually needed? */
1003                                 al=SSL_AD_HANDSHAKE_FAILURE;
1004                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1005                                 goto f_err;
1006                                 }
1007                         }
1008
1009                 d = dtls1_set_message_header(s, d,
1010                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1011
1012                 /* we should now have things packed up, so lets send
1013                  * it off */
1014                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1015                 s->init_off=0;
1016
1017                 /* buffer the message to handle re-xmits */
1018                 dtls1_buffer_message(s, 0);
1019                 }
1020
1021         s->state = SSL3_ST_SW_KEY_EXCH_B;
1022         EVP_MD_CTX_cleanup(&md_ctx);
1023         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1024 f_err:
1025         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1026 err:
1027         EVP_MD_CTX_cleanup(&md_ctx);
1028         return(-1);
1029         }
1030
1031 int dtls1_send_certificate_request(SSL *s)
1032         {
1033         unsigned char *p,*d;
1034         int i,j,nl,off,n;
1035         STACK_OF(X509_NAME) *sk=NULL;
1036         X509_NAME *name;
1037         BUF_MEM *buf;
1038         unsigned int msg_len;
1039
1040         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1041                 {
1042                 buf=s->init_buf;
1043
1044                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1045
1046                 /* get the list of acceptable cert types */
1047                 p++;
1048                 n=ssl3_get_req_cert_type(s,p);
1049                 d[0]=n;
1050                 p+=n;
1051                 n++;
1052
1053                 off=n;
1054                 p+=2;
1055                 n+=2;
1056
1057                 sk=SSL_get_client_CA_list(s);
1058                 nl=0;
1059                 if (sk != NULL)
1060                         {
1061                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1062                                 {
1063                                 name=sk_X509_NAME_value(sk,i);
1064                                 j=i2d_X509_NAME(name,NULL);
1065                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1066                                         {
1067                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1068                                         goto err;
1069                                         }
1070                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1071                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1072                                         {
1073                                         s2n(j,p);
1074                                         i2d_X509_NAME(name,&p);
1075                                         n+=2+j;
1076                                         nl+=2+j;
1077                                         }
1078                                 else
1079                                         {
1080                                         d=p;
1081                                         i2d_X509_NAME(name,&p);
1082                                         j-=2; s2n(j,d); j+=2;
1083                                         n+=j;
1084                                         nl+=j;
1085                                         }
1086                                 }
1087                         }
1088                 /* else no CA names */
1089                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1090                 s2n(nl,p);
1091
1092                 d=(unsigned char *)buf->data;
1093                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1094                 l2n3(n,d);
1095                 s2n(s->d1->handshake_write_seq,d);
1096                 s->d1->handshake_write_seq++;
1097
1098                 /* we should now have things packed up, so lets send
1099                  * it off */
1100
1101                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1102                 s->init_off=0;
1103 #ifdef NETSCAPE_HANG_BUG
1104 /* XXX: what to do about this? */
1105                 p=(unsigned char *)s->init_buf->data + s->init_num;
1106
1107                 /* do the header */
1108                 *(p++)=SSL3_MT_SERVER_DONE;
1109                 *(p++)=0;
1110                 *(p++)=0;
1111                 *(p++)=0;
1112                 s->init_num += 4;
1113 #endif
1114
1115                 /* XDTLS:  set message header ? */
1116                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1117                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1118                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1119
1120                 /* buffer the message to handle re-xmits */
1121                 dtls1_buffer_message(s, 0);
1122
1123                 s->state = SSL3_ST_SW_CERT_REQ_B;
1124                 }
1125
1126         /* SSL3_ST_SW_CERT_REQ_B */
1127         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1128 err:
1129         return(-1);
1130         }
1131
1132 int dtls1_send_server_certificate(SSL *s)
1133         {
1134         unsigned long l;
1135         X509 *x;
1136
1137         if (s->state == SSL3_ST_SW_CERT_A)
1138                 {
1139                 x=ssl_get_server_send_cert(s);
1140                 if (x == NULL &&
1141                         /* VRS: allow null cert if auth == KRB5 */
1142                         (s->s3->tmp.new_cipher->algorithms
1143                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1144                         != (SSL_aKRB5|SSL_kKRB5))
1145                         {
1146                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1147                         return(0);
1148                         }
1149
1150                 l=dtls1_output_cert_chain(s,x);
1151                 s->state=SSL3_ST_SW_CERT_B;
1152                 s->init_num=(int)l;
1153                 s->init_off=0;
1154
1155                 /* buffer the message to handle re-xmits */
1156                 dtls1_buffer_message(s, 0);
1157                 }
1158
1159         /* SSL3_ST_SW_CERT_B */
1160         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1161         }