ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         long num1;
 151         unsigned long alg_k;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         /* init things to blank */
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         if (s->cert == NULL)
 169                 {
 170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 171                 return(-1);
 172                 }
 173
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_RENEGOTIATE:
 181                         s->new_session=1;
 182                         /* s->state=SSL_ST_ACCEPT; */
 183
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_ACCEPT:
 186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 187                 case SSL_ST_OK|SSL_ST_ACCEPT:
 188
 189                         s->server=1;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 193                                 {
 194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 195                                 return -1;
 196                                 }
 197                         s->type=SSL_ST_ACCEPT;
 198
 199                         if (s->init_buf == NULL)
 200                                 {
 201                                 if ((buf=BUF_MEM_new()) == NULL)
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 207                                         {
 208                                         ret= -1;
 209                                         goto end;
 210                                         }
 211                                 s->init_buf=buf;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s))
 215                                 {
 216                                 ret= -1;
 217                                 goto end;
 218                                 }
 219
 220                         s->init_num=0;
 221
 222                         if (s->state != SSL_ST_RENEGOTIATE)
 223                                 {
 224                                 /* Ok, we now need to push on a buffering BIO so that
 225                                  * the output is sent in a way that TCP likes :-)
 226                                  */
 227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 228
 229                                 ssl3_init_finished_mac(s);
 230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 231                                 s->ctx->stats.sess_accept++;
 232                                 }
 233                         else
 234                                 {
 235                                 /* s->state == SSL_ST_RENEGOTIATE,
 236                                  * we will just send a HelloRequest */
 237                                 s->ctx->stats.sess_accept_renegotiate++;
 238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 239                                 }
 240
 241                         if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 242                                 s->d1->send_cookie = 1;
 243                         else
 244                                 s->d1->send_cookie = 0;
 245
 246                         break;
 247
 248                 case SSL3_ST_SW_HELLO_REQ_A:
 249                 case SSL3_ST_SW_HELLO_REQ_B:
 250
 251                         s->shutdown=0;
 252                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 253                         ret=dtls1_send_hello_request(s);
 254                         if (ret <= 0) goto end;
 255                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 256                         s->state=SSL3_ST_SW_FLUSH;
 257                         s->init_num=0;
 258
 259                         ssl3_init_finished_mac(s);
 260                         break;
 261
 262                 case SSL3_ST_SW_HELLO_REQ_C:
 263                         s->state=SSL_ST_OK;
 264                         break;
 265
 266                 case SSL3_ST_SR_CLNT_HELLO_A:
 267                 case SSL3_ST_SR_CLNT_HELLO_B:
 268                 case SSL3_ST_SR_CLNT_HELLO_C:
 269
 270                         s->shutdown=0;
 271                         ret=ssl3_get_client_hello(s);
 272                         if (ret <= 0) goto end;
 273                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 274                         s->new_session = 2;
 275
 276                         if (s->d1->send_cookie)
 277                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 278                         else
 279                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 280
 281                         s->init_num=0;
 282                         break;
 283
 284                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 285                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 286
 287                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 288                         ret = dtls1_send_hello_verify_request(s);
 289                         if ( ret <= 0) goto end;
 290                         s->d1->send_cookie = 0;
 291                         s->state=SSL3_ST_SW_FLUSH;
 292                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 293
 294                         /* HelloVerifyRequest resets Finished MAC */
 295                         ssl3_init_finished_mac(s);
 296                         break;
 297
 298                 case SSL3_ST_SW_SRVR_HELLO_A:
 299                 case SSL3_ST_SW_SRVR_HELLO_B:
 300                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 301                         ret=dtls1_send_server_hello(s);
 302                         if (ret <= 0) goto end;
 303
 304                         if (s->hit)
 305                                 s->state=SSL3_ST_SW_CHANGE_A;
 306                         else
 307                                 s->state=SSL3_ST_SW_CERT_A;
 308                         s->init_num=0;
 309                         break;
 310
 311                 case SSL3_ST_SW_CERT_A:
 312                 case SSL3_ST_SW_CERT_B:
 313                         /* Check if it is anon DH */
 314                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 315                                 {
 316                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 317                                 ret=dtls1_send_server_certificate(s);
 318                                 if (ret <= 0) goto end;
 319                                 }
 320                         else
 321                                 skip=1;
 322                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 323                         s->init_num=0;
 324                         break;
 325
 326                 case SSL3_ST_SW_KEY_EXCH_A:
 327                 case SSL3_ST_SW_KEY_EXCH_B:
 328                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 329
 330                         /* clear this, it may get reset by
 331                          * send_server_key_exchange */
 332                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 333 #ifndef OPENSSL_NO_KRB5
 334                                 && !(alg_k & SSL_kKRB5)
 335 #endif /* OPENSSL_NO_KRB5 */
 336                                 )
 337                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 338                                  * even when forbidden by protocol specs
 339                                  * (handshake may fail as clients are not required to
 340                                  * be able to handle this) */
 341                                 s->s3->tmp.use_rsa_tmp=1;
 342                         else
 343                                 s->s3->tmp.use_rsa_tmp=0;
 344
 345                         /* only send if a DH key exchange or
 346                          * RSA but we have a sign only certificate */
 347                         if (s->s3->tmp.use_rsa_tmp
 348                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 349                             || ((alg_k & SSL_kRSA)
 350                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 351                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 352                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 353                                         )
 354                                     )
 355                                 )
 356                             )
 357                                 {
 358                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 359                                 ret=dtls1_send_server_key_exchange(s);
 360                                 if (ret <= 0) goto end;
 361                                 }
 362                         else
 363                                 skip=1;
 364
 365                         s->state=SSL3_ST_SW_CERT_REQ_A;
 366                         s->init_num=0;
 367                         break;
 368
 369                 case SSL3_ST_SW_CERT_REQ_A:
 370                 case SSL3_ST_SW_CERT_REQ_B:
 371                         if (/* don't request cert unless asked for it: */
 372                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 373                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 374                                  * don't request cert during re-negotiation: */
 375                                 ((s->session->peer != NULL) &&
 376                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 377                                 /* never request cert in anonymous ciphersuites
 378                                  * (see section "Certificate request" in SSL 3 drafts
 379                                  * and in RFC 2246): */
 380                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 381                                  /* ... except when the application insists on verification
 382                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 383                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 384                                  /* never request cert in Kerberos ciphersuites */
 385                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 386                                 {
 387                                 /* no cert request */
 388                                 skip=1;
 389                                 s->s3->tmp.cert_request=0;
 390                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 391                                 }
 392                         else
 393                                 {
 394                                 s->s3->tmp.cert_request=1;
 395                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 396                                 ret=dtls1_send_certificate_request(s);
 397                                 if (ret <= 0) goto end;
 398 #ifndef NETSCAPE_HANG_BUG
 399                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 400 #else
 401                                 s->state=SSL3_ST_SW_FLUSH;
 402                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 403 #endif
 404                                 s->init_num=0;
 405                                 }
 406                         break;
 407
 408                 case SSL3_ST_SW_SRVR_DONE_A:
 409                 case SSL3_ST_SW_SRVR_DONE_B:
 410                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 1, NULL);
 411                         ret=dtls1_send_server_done(s);
 412                         if (ret <= 0) goto end;
 413                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 414                         s->state=SSL3_ST_SW_FLUSH;
 415                         s->init_num=0;
 416                         break;
 417
 418                 case SSL3_ST_SW_FLUSH:
 419                         /* number of bytes to be flushed */
 420                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 421                         if (num1 > 0)
 422                                 {
 423                                 s->rwstate=SSL_WRITING;
 424                                 num1=BIO_flush(s->wbio);
 425                                 if (num1 <= 0) { ret= -1; goto end; }
 426                                 s->rwstate=SSL_NOTHING;
 427                                 }
 428
 429                         s->state=s->s3->tmp.next_state;
 430                         break;
 431
 432                 case SSL3_ST_SR_CERT_A:
 433                 case SSL3_ST_SR_CERT_B:
 434                         /* Check for second client hello (MS SGC) */
 435                         ret = ssl3_check_client_hello(s);
 436                         if (ret <= 0)
 437                                 goto end;
 438                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 439                         if (ret == 2)
 440                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 441                         else {
 442                                 /* could be sent for a DH cert, even if we
 443                                  * have not asked for it :-) */
 444                                 ret=ssl3_get_client_certificate(s);
 445                                 if (ret <= 0) goto end;
 446                                 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 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                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 457                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 458                         s->init_num=0;
 459
 460                         /* We need to get hashes here so if there is
 461                          * a client cert, it can be verified */
 462                         s->method->ssl3_enc->cert_verify_mac(s,
 463                                 NID_md5,
 464                                 &(s->s3->tmp.cert_verify_md[0]));
 465                         s->method->ssl3_enc->cert_verify_mac(s,
 466                                 NID_sha1,
 467                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 468
 469                         break;
 470
 471                 case SSL3_ST_SR_CERT_VRFY_A:
 472                 case SSL3_ST_SR_CERT_VRFY_B:
 473
 474                         /* we should decide if we expected this one */
 475                         ret=ssl3_get_cert_verify(s);
 476                         if (ret <= 0) goto end;
 477                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 478
 479                         s->state=SSL3_ST_SR_FINISHED_A;
 480                         s->init_num=0;
 481                         break;
 482
 483                 case SSL3_ST_SR_FINISHED_A:
 484                 case SSL3_ST_SR_FINISHED_B:
 485                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 486                                 SSL3_ST_SR_FINISHED_B);
 487                         if (ret <= 0) goto end;
 488                         BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_TIMEOUT, 0, NULL);
 489                         if (s->hit)
 490                                 s->state=SSL_ST_OK;
 491                         else
 492                                 s->state=SSL3_ST_SW_CHANGE_A;
 493                         s->init_num=0;
 494                         break;
 495
 496                 case SSL3_ST_SW_CHANGE_A:
 497                 case SSL3_ST_SW_CHANGE_B:
 498
 499                         s->session->cipher=s->s3->tmp.new_cipher;
 500                         if (!s->method->ssl3_enc->setup_key_block(s))
 501                                 { ret= -1; goto end; }
 502
 503                         ret=dtls1_send_change_cipher_spec(s,
 504                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 505
 506                         if (ret <= 0) goto end;
 507                         s->state=SSL3_ST_SW_FINISHED_A;
 508                         s->init_num=0;
 509
 510                         if (!s->method->ssl3_enc->change_cipher_state(s,
 511                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 512                                 {
 513                                 ret= -1;
 514                                 goto end;
 515                                 }
 516
 517                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 518                         break;
 519
 520                 case SSL3_ST_SW_FINISHED_A:
 521                 case SSL3_ST_SW_FINISHED_B:
 522                         ret=dtls1_send_finished(s,
 523                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 524                                 s->method->ssl3_enc->server_finished_label,
 525                                 s->method->ssl3_enc->server_finished_label_len);
 526                         if (ret <= 0) goto end;
 527                         s->state=SSL3_ST_SW_FLUSH;
 528                         if (s->hit)
 529                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 530                         else
 531                                 s->s3->tmp.next_state=SSL_ST_OK;
 532                         s->init_num=0;
 533                         break;
 534
 535                 case SSL_ST_OK:
 536                         /* clean a few things up */
 537                         ssl3_cleanup_key_block(s);
 538
 539 #if 0
 540                         BUF_MEM_free(s->init_buf);
 541                         s->init_buf=NULL;
 542 #endif
 543
 544                         /* remove buffering on output */
 545                         ssl_free_wbio_buffer(s);
 546
 547                         s->init_num=0;
 548
 549                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 550                                 {
 551                                 /* actually not necessarily a 'new' session unless
 552                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 553
 554                                 s->new_session=0;
 555
 556                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 557
 558                                 s->ctx->stats.sess_accept_good++;
 559                                 /* s->server=1; */
 560                                 s->handshake_func=dtls1_accept;
 561
 562                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 563                                 }
 564
 565                         ret = 1;
 566
 567                         /* done handshaking, next message is client hello */
 568                         s->d1->handshake_read_seq = 0;
 569                         /* next message is server hello */
 570                         s->d1->handshake_write_seq = 0;
 571                         s->d1->next_handshake_write_seq = 0;
 572                         goto end;
 573                         /* break; */
 574
 575                 default:
 576                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 577                         ret= -1;
 578                         goto end;
 579                         /* break; */
 580                         }
 581
 582                 if (!s->s3->tmp.reuse_message && !skip)
 583                         {
 584                         if (s->debug)
 585                                 {
 586                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 587                                         goto end;
 588                                 }
 589
 590
 591                         if ((cb != NULL) && (s->state != state))
 592                                 {
 593                                 new_state=s->state;
 594                                 s->state=state;
 595                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 596                                 s->state=new_state;
 597                                 }
 598                         }
 599                 skip=0;
 600                 }
 601 end:
 602         /* BIO_flush(s->wbio); */
 603
 604         s->in_handshake--;
 605         if (cb != NULL)
 606                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 607         return(ret);
 608         }
 609
 610 int dtls1_send_hello_request(SSL *s)
 611         {
 612         unsigned char *p;
 613
 614         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 615                 {
 616                 p=(unsigned char *)s->init_buf->data;
 617                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 618
 619                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 620                 /* number of bytes to write */
 621                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 622                 s->init_off=0;
 623
 624                 /* no need to buffer this message, since there are no retransmit
 625                  * requests for it */
 626                 }
 627
 628         /* SSL3_ST_SW_HELLO_REQ_B */
 629         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 630         }
 631
 632 int dtls1_send_hello_verify_request(SSL *s)
 633         {
 634         unsigned int msg_len;
 635         unsigned char *msg, *buf, *p;
 636
 637         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 638                 {
 639                 buf = (unsigned char *)s->init_buf->data;
 640
 641                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 642                 *(p++) = s->version >> 8;
 643                 *(p++) = s->version & 0xFF;
 644
 645                 if (s->ctx->app_gen_cookie_cb != NULL &&
 646                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 647                         &(s->d1->cookie_len)) == 0)
 648                         {
 649                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 650                         return 0;
 651                         }
 652                 /* else the cookie is assumed to have
 653                  * been initialized by the application */
 654
 655                 *(p++) = (unsigned char) s->d1->cookie_len;
 656                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 657                 p += s->d1->cookie_len;
 658                 msg_len = p - msg;
 659
 660                 dtls1_set_message_header(s, buf,
 661                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 662
 663                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 664                 /* number of bytes to write */
 665                 s->init_num=p-buf;
 666                 s->init_off=0;
 667
 668                 /* buffer the message to handle re-xmits */
 669                 dtls1_buffer_message(s, 0);
 670                 }
 671
 672         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 673         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 674         }
 675
 676 int dtls1_send_server_hello(SSL *s)
 677         {
 678         unsigned char *buf;
 679         unsigned char *p,*d;
 680         int i;
 681         unsigned int sl;
 682         unsigned long l,Time;
 683
 684         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 685                 {
 686                 buf=(unsigned char *)s->init_buf->data;
 687                 p=s->s3->server_random;
 688                 Time=(unsigned long)time(NULL);                 /* Time */
 689                 l2n(Time,p);
 690                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 691                 /* Do the message type and length last */
 692                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 693
 694                 *(p++)=s->version>>8;
 695                 *(p++)=s->version&0xff;
 696
 697                 /* Random stuff */
 698                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 699                 p+=SSL3_RANDOM_SIZE;
 700
 701                 /* now in theory we have 3 options to sending back the
 702                  * session id.  If it is a re-use, we send back the
 703                  * old session-id, if it is a new session, we send
 704                  * back the new session-id or we send back a 0 length
 705                  * session-id if we want it to be single use.
 706                  * Currently I will not implement the '0' length session-id
 707                  * 12-Jan-98 - I'll now support the '0' length stuff.
 708                  */
 709                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 710                         s->session->session_id_length=0;
 711
 712                 sl=s->session->session_id_length;
 713                 if (sl > sizeof s->session->session_id)
 714                         {
 715                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 716                         return -1;
 717                         }
 718                 *(p++)=sl;
 719                 memcpy(p,s->session->session_id,sl);
 720                 p+=sl;
 721
 722                 /* put the cipher */
 723                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 724                 p+=i;
 725
 726                 /* put the compression method */
 727 #ifdef OPENSSL_NO_COMP
 728                 *(p++)=0;
 729 #else
 730                 if (s->s3->tmp.new_compression == NULL)
 731                         *(p++)=0;
 732                 else
 733                         *(p++)=s->s3->tmp.new_compression->id;
 734 #endif
 735
 736                 /* do the header */
 737                 l=(p-d);
 738                 d=buf;
 739
 740                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 741
 742                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 743                 /* number of bytes to write */
 744                 s->init_num=p-buf;
 745                 s->init_off=0;
 746
 747                 /* buffer the message to handle re-xmits */
 748                 dtls1_buffer_message(s, 0);
 749                 }
 750
 751         /* SSL3_ST_SW_SRVR_HELLO_B */
 752         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 753         }
 754
 755 int dtls1_send_server_done(SSL *s)
 756         {
 757         unsigned char *p;
 758
 759         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 760                 {
 761                 p=(unsigned char *)s->init_buf->data;
 762
 763                 /* do the header */
 764                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 765
 766                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 767                 /* number of bytes to write */
 768                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 769                 s->init_off=0;
 770
 771                 /* buffer the message to handle re-xmits */
 772                 dtls1_buffer_message(s, 0);
 773                 }
 774
 775         /* SSL3_ST_SW_SRVR_DONE_B */
 776         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 777         }
 778
 779 int dtls1_send_server_key_exchange(SSL *s)
 780         {
 781 #ifndef OPENSSL_NO_RSA
 782         unsigned char *q;
 783         int j,num;
 784         RSA *rsa;
 785         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 786         unsigned int u;
 787 #endif
 788 #ifndef OPENSSL_NO_DH
 789         DH *dh=NULL,*dhp;
 790 #endif
 791         EVP_PKEY *pkey;
 792         unsigned char *p,*d;
 793         int al,i;
 794         unsigned long type;
 795         int n;
 796         CERT *cert;
 797         BIGNUM *r[4];
 798         int nr[4],kn;
 799         BUF_MEM *buf;
 800         EVP_MD_CTX md_ctx;
 801
 802         EVP_MD_CTX_init(&md_ctx);
 803         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 804                 {
 805                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 806                 cert=s->cert;
 807
 808                 buf=s->init_buf;
 809
 810                 r[0]=r[1]=r[2]=r[3]=NULL;
 811                 n=0;
 812 #ifndef OPENSSL_NO_RSA
 813                 if (type & SSL_kRSA)
 814                         {
 815                         rsa=cert->rsa_tmp;
 816                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 817                                 {
 818                                 rsa=s->cert->rsa_tmp_cb(s,
 819                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 820                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 821                                 if(rsa == NULL)
 822                                 {
 823                                         al=SSL_AD_HANDSHAKE_FAILURE;
 824                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 825                                         goto f_err;
 826                                 }
 827                                 RSA_up_ref(rsa);
 828                                 cert->rsa_tmp=rsa;
 829                                 }
 830                         if (rsa == NULL)
 831                                 {
 832                                 al=SSL_AD_HANDSHAKE_FAILURE;
 833                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 834                                 goto f_err;
 835                                 }
 836                         r[0]=rsa->n;
 837                         r[1]=rsa->e;
 838                         s->s3->tmp.use_rsa_tmp=1;
 839                         }
 840                 else
 841 #endif
 842 #ifndef OPENSSL_NO_DH
 843                         if (type & SSL_kEDH)
 844                         {
 845                         dhp=cert->dh_tmp;
 846                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 847                                 dhp=s->cert->dh_tmp_cb(s,
 848                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 849                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 850                         if (dhp == NULL)
 851                                 {
 852                                 al=SSL_AD_HANDSHAKE_FAILURE;
 853                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 854                                 goto f_err;
 855                                 }
 856
 857                         if (s->s3->tmp.dh != NULL)
 858                                 {
 859                                 DH_free(dh);
 860                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 861                                 goto err;
 862                                 }
 863
 864                         if ((dh=DHparams_dup(dhp)) == NULL)
 865                                 {
 866                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 867                                 goto err;
 868                                 }
 869
 870                         s->s3->tmp.dh=dh;
 871                         if ((dhp->pub_key == NULL ||
 872                              dhp->priv_key == NULL ||
 873                              (s->options & SSL_OP_SINGLE_DH_USE)))
 874                                 {
 875                                 if(!DH_generate_key(dh))
 876                                     {
 877                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 878                                            ERR_R_DH_LIB);
 879                                     goto err;
 880                                     }
 881                                 }
 882                         else
 883                                 {
 884                                 dh->pub_key=BN_dup(dhp->pub_key);
 885                                 dh->priv_key=BN_dup(dhp->priv_key);
 886                                 if ((dh->pub_key == NULL) ||
 887                                         (dh->priv_key == NULL))
 888                                         {
 889                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 890                                         goto err;
 891                                         }
 892                                 }
 893                         r[0]=dh->p;
 894                         r[1]=dh->g;
 895                         r[2]=dh->pub_key;
 896                         }
 897                 else
 898 #endif
 899                         {
 900                         al=SSL_AD_HANDSHAKE_FAILURE;
 901                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 902                         goto f_err;
 903                         }
 904                 for (i=0; r[i] != NULL; i++)
 905                         {
 906                         nr[i]=BN_num_bytes(r[i]);
 907                         n+=2+nr[i];
 908                         }
 909
 910                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
 911                         {
 912                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 913                                 == NULL)
 914                                 {
 915                                 al=SSL_AD_DECODE_ERROR;
 916                                 goto f_err;
 917                                 }
 918                         kn=EVP_PKEY_size(pkey);
 919                         }
 920                 else
 921                         {
 922                         pkey=NULL;
 923                         kn=0;
 924                         }
 925
 926                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 927                         {
 928                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 929                         goto err;
 930                         }
 931                 d=(unsigned char *)s->init_buf->data;
 932                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 933
 934                 for (i=0; r[i] != NULL; i++)
 935                         {
 936                         s2n(nr[i],p);
 937                         BN_bn2bin(r[i],p);
 938                         p+=nr[i];
 939                         }
 940
 941                 /* not anonymous */
 942                 if (pkey != NULL)
 943                         {
 944                         /* n is the length of the params, they start at
 945                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 946                          * at the end. */
 947 #ifndef OPENSSL_NO_RSA
 948                         if (pkey->type == EVP_PKEY_RSA)
 949                                 {
 950                                 q=md_buf;
 951                                 j=0;
 952                                 for (num=2; num > 0; num--)
 953                                         {
 954                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 955                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 956                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 957                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 958                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 959                                         EVP_DigestFinal_ex(&md_ctx,q,
 960                                                 (unsigned int *)&i);
 961                                         q+=i;
 962                                         j+=i;
 963                                         }
 964                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 965                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 966                                         {
 967                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 968                                         goto err;
 969                                         }
 970                                 s2n(u,p);
 971                                 n+=u+2;
 972                                 }
 973                         else
 974 #endif
 975 #if !defined(OPENSSL_NO_DSA)
 976                                 if (pkey->type == EVP_PKEY_DSA)
 977                                 {
 978                                 /* lets do DSS */
 979                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 980                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 981                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 982                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 983                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 984                                         (unsigned int *)&i,pkey))
 985                                         {
 986                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 987                                         goto err;
 988                                         }
 989                                 s2n(i,p);
 990                                 n+=i+2;
 991                                 }
 992                         else
 993 #endif
 994                                 {
 995                                 /* Is this error check actually needed? */
 996                                 al=SSL_AD_HANDSHAKE_FAILURE;
 997                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 998                                 goto f_err;
 999                                 }
1000                         }
1001
1002                 d = dtls1_set_message_header(s, d,
1003                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1004
1005                 /* we should now have things packed up, so lets send
1006                  * it off */
1007                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1008                 s->init_off=0;
1009
1010                 /* buffer the message to handle re-xmits */
1011                 dtls1_buffer_message(s, 0);
1012                 }
1013
1014         s->state = SSL3_ST_SW_KEY_EXCH_B;
1015         EVP_MD_CTX_cleanup(&md_ctx);
1016         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1017 f_err:
1018         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1019 err:
1020         EVP_MD_CTX_cleanup(&md_ctx);
1021         return(-1);
1022         }
1023
1024 int dtls1_send_certificate_request(SSL *s)
1025         {
1026         unsigned char *p,*d;
1027         int i,j,nl,off,n;
1028         STACK_OF(X509_NAME) *sk=NULL;
1029         X509_NAME *name;
1030         BUF_MEM *buf;
1031         unsigned int msg_len;
1032
1033         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1034                 {
1035                 buf=s->init_buf;
1036
1037                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1038
1039                 /* get the list of acceptable cert types */
1040                 p++;
1041                 n=ssl3_get_req_cert_type(s,p);
1042                 d[0]=n;
1043                 p+=n;
1044                 n++;
1045
1046                 off=n;
1047                 p+=2;
1048                 n+=2;
1049
1050                 sk=SSL_get_client_CA_list(s);
1051                 nl=0;
1052                 if (sk != NULL)
1053                         {
1054                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1055                                 {
1056                                 name=sk_X509_NAME_value(sk,i);
1057                                 j=i2d_X509_NAME(name,NULL);
1058                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1059                                         {
1060                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1061                                         goto err;
1062                                         }
1063                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1064                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1065                                         {
1066                                         s2n(j,p);
1067                                         i2d_X509_NAME(name,&p);
1068                                         n+=2+j;
1069                                         nl+=2+j;
1070                                         }
1071                                 else
1072                                         {
1073                                         d=p;
1074                                         i2d_X509_NAME(name,&p);
1075                                         j-=2; s2n(j,d); j+=2;
1076                                         n+=j;
1077                                         nl+=j;
1078                                         }
1079                                 }
1080                         }
1081                 /* else no CA names */
1082                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1083                 s2n(nl,p);
1084
1085                 d=(unsigned char *)buf->data;
1086                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1087                 l2n3(n,d);
1088                 s2n(s->d1->handshake_write_seq,d);
1089                 s->d1->handshake_write_seq++;
1090
1091                 /* we should now have things packed up, so lets send
1092                  * it off */
1093
1094                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1095                 s->init_off=0;
1096 #ifdef NETSCAPE_HANG_BUG
1097 /* XXX: what to do about this? */
1098                 p=(unsigned char *)s->init_buf->data + s->init_num;
1099
1100                 /* do the header */
1101                 *(p++)=SSL3_MT_SERVER_DONE;
1102                 *(p++)=0;
1103                 *(p++)=0;
1104                 *(p++)=0;
1105                 s->init_num += 4;
1106 #endif
1107
1108                 /* XDTLS:  set message header ? */
1109                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1110                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1111                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1112
1113                 /* buffer the message to handle re-xmits */
1114                 dtls1_buffer_message(s, 0);
1115
1116                 s->state = SSL3_ST_SW_CERT_REQ_B;
1117                 }
1118
1119         /* SSL3_ST_SW_CERT_REQ_B */
1120         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1121 err:
1122         return(-1);
1123         }
1124
1125 int dtls1_send_server_certificate(SSL *s)
1126         {
1127         unsigned long l;
1128         X509 *x;
1129
1130         if (s->state == SSL3_ST_SW_CERT_A)
1131                 {
1132                 x=ssl_get_server_send_cert(s);
1133                 if (x == NULL)
1134                         {
1135                         /* VRS: allow null cert if auth == KRB5 */
1136                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1137                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1138                                 {
1139                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1140                                 return(0);
1141                                 }
1142                         }
1143
1144                 l=dtls1_output_cert_chain(s,x);
1145                 s->state=SSL3_ST_SW_CERT_B;
1146                 s->init_num=(int)l;
1147                 s->init_off=0;
1148
1149                 /* buffer the message to handle re-xmits */
1150                 dtls1_buffer_message(s, 0);
1151                 }
1152
1153         /* SSL3_ST_SW_CERT_B */
1154         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1155         }