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         int ret= -1;
 150         int new_state,state,skip=0;
 151
 152         RAND_add(&Time,sizeof(Time),0);
 153         ERR_clear_error();
 154         clear_sys_error();
 155
 156         if (s->info_callback != NULL)
 157                 cb=s->info_callback;
 158         else if (s->ctx->info_callback != NULL)
 159                 cb=s->ctx->info_callback;
 160
 161         /* init things to blank */
 162         s->in_handshake++;
 163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 164
 165         if (s->cert == NULL)
 166                 {
 167                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 168                 return(-1);
 169                 }
 170
 171         for (;;)
 172                 {
 173                 state=s->state;
 174
 175                 switch (s->state)
 176                         {
 177                 case SSL_ST_RENEGOTIATE:
 178                         s->new_session=1;
 179                         /* s->state=SSL_ST_ACCEPT; */
 180
 181                 case SSL_ST_BEFORE:
 182                 case SSL_ST_ACCEPT:
 183                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 184                 case SSL_ST_OK|SSL_ST_ACCEPT:
 185
 186                         s->server=1;
 187                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 188
 189                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 190                                 {
 191                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 192                                 return -1;
 193                                 }
 194                         s->type=SSL_ST_ACCEPT;
 195
 196                         if (s->init_buf == NULL)
 197                                 {
 198                                 if ((buf=BUF_MEM_new()) == NULL)
 199                                         {
 200                                         ret= -1;
 201                                         goto end;
 202                                         }
 203                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 204                                         {
 205                                         ret= -1;
 206                                         goto end;
 207                                         }
 208                                 s->init_buf=buf;
 209                                 }
 210
 211                         if (!ssl3_setup_buffers(s))
 212                                 {
 213                                 ret= -1;
 214                                 goto end;
 215                                 }
 216
 217                         s->init_num=0;
 218
 219                         if (s->state != SSL_ST_RENEGOTIATE)
 220                                 {
 221                                 /* Ok, we now need to push on a buffering BIO so that
 222                                  * the output is sent in a way that TCP likes :-)
 223                                  */
 224                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 225
 226                                 ssl3_init_finished_mac(s);
 227                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 228                                 s->ctx->stats.sess_accept++;
 229                                 }
 230                         else
 231                                 {
 232                                 /* s->state == SSL_ST_RENEGOTIATE,
 233                                  * we will just send a HelloRequest */
 234                                 s->ctx->stats.sess_accept_renegotiate++;
 235                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 236                                 }
 237
 238                         break;
 239
 240                 case SSL3_ST_SW_HELLO_REQ_A:
 241                 case SSL3_ST_SW_HELLO_REQ_B:
 242
 243                         s->shutdown=0;
 244                         dtls1_start_timer(s);
 245                         ret=dtls1_send_hello_request(s);
 246                         if (ret <= 0) goto end;
 247                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 248                         s->state=SSL3_ST_SW_FLUSH;
 249                         s->init_num=0;
 250
 251                         ssl3_init_finished_mac(s);
 252                         break;
 253
 254                 case SSL3_ST_SW_HELLO_REQ_C:
 255                         s->state=SSL_ST_OK;
 256                         break;
 257
 258                 case SSL3_ST_SR_CLNT_HELLO_A:
 259                 case SSL3_ST_SR_CLNT_HELLO_B:
 260                 case SSL3_ST_SR_CLNT_HELLO_C:
 261
 262                         s->shutdown=0;
 263                         ret=ssl3_get_client_hello(s);
 264                         if (ret <= 0) goto end;
 265                         dtls1_stop_timer(s);
 266
 267                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 268                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 269                         else
 270                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 271
 272                         s->init_num=0;
 273
 274                         /* If we're just listening, stop here */
 275                         if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 276                                 {
 277                                 ret = 2;
 278                                 s->d1->listen = 0;
 279                                 goto end;
 280                                 }
 281
 282                         break;
 283
 284                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 285                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 286
 287                         dtls1_start_timer(s);
 288                         ret = dtls1_send_hello_verify_request(s);
 289                         if ( ret <= 0) goto end;
 290                         s->state=SSL3_ST_SW_FLUSH;
 291                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 292
 293                         /* HelloVerifyRequests resets Finished MAC */
 294                         if (s->client_version != DTLS1_BAD_VER)
 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                         s->new_session = 2;
 301                         dtls1_start_timer(s);
 302                         ret=dtls1_send_server_hello(s);
 303                         if (ret <= 0) goto end;
 304
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         if (s->hit)
 307                                 {
 308                                 if (s->tlsext_ticket_expected)
 309                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 310                                 else
 311                                         s->state=SSL3_ST_SW_CHANGE_A;
 312                                 }
 313 #else
 314                         if (s->hit)
 315                                         s->state=SSL3_ST_SW_CHANGE_A;
 316 #endif
 317                         else
 318                                 s->state=SSL3_ST_SW_CERT_A;
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_SW_CERT_A:
 323                 case SSL3_ST_SW_CERT_B:
 324                         /* Check if it is anon DH */
 325                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 326                                 {
 327                                 dtls1_start_timer(s);
 328                                 ret=dtls1_send_server_certificate(s);
 329                                 if (ret <= 0) goto end;
 330 #ifndef OPENSSL_NO_TLSEXT
 331                                 if (s->tlsext_status_expected)
 332                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335                                 }
 336                         else
 337                                 {
 338                                 skip = 1;
 339                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 340                                 }
 341 #else
 342                                 }
 343                         else
 344                                 skip=1;
 345
 346                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 347 #endif
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_KEY_EXCH_A:
 352                 case SSL3_ST_SW_KEY_EXCH_B:
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354
 355                         /* clear this, it may get reset by
 356                          * send_server_key_exchange */
 357                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 358 #ifndef OPENSSL_NO_KRB5
 359                                 && !(l & SSL_KRB5)
 360 #endif /* OPENSSL_NO_KRB5 */
 361                                 )
 362                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 363                                  * even when forbidden by protocol specs
 364                                  * (handshake may fail as clients are not required to
 365                                  * be able to handle this) */
 366                                 s->s3->tmp.use_rsa_tmp=1;
 367                         else
 368                                 s->s3->tmp.use_rsa_tmp=0;
 369
 370                         /* only send if a DH key exchange, fortezza or
 371                          * RSA but we have a sign only certificate */
 372                         if (s->s3->tmp.use_rsa_tmp
 373                             || (l & (SSL_DH|SSL_kFZA))
 374                             || ((l & SSL_kRSA)
 375                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 376                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 377                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 378                                         )
 379                                     )
 380                                 )
 381                             )
 382                                 {
 383                                 dtls1_start_timer(s);
 384                                 ret=dtls1_send_server_key_exchange(s);
 385                                 if (ret <= 0) goto end;
 386                                 }
 387                         else
 388                                 skip=1;
 389
 390                         s->state=SSL3_ST_SW_CERT_REQ_A;
 391                         s->init_num=0;
 392                         break;
 393
 394                 case SSL3_ST_SW_CERT_REQ_A:
 395                 case SSL3_ST_SW_CERT_REQ_B:
 396                         if (/* don't request cert unless asked for it: */
 397                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 398                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 399                                  * don't request cert during re-negotiation: */
 400                                 ((s->session->peer != NULL) &&
 401                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 402                                 /* never request cert in anonymous ciphersuites
 403                                  * (see section "Certificate request" in SSL 3 drafts
 404                                  * and in RFC 2246): */
 405                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 406                                  /* ... except when the application insists on verification
 407                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 408                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 409                                  /* never request cert in Kerberos ciphersuites */
 410                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 411                                 {
 412                                 /* no cert request */
 413                                 skip=1;
 414                                 s->s3->tmp.cert_request=0;
 415                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 416                                 }
 417                         else
 418                                 {
 419                                 s->s3->tmp.cert_request=1;
 420                                 dtls1_start_timer(s);
 421                                 ret=dtls1_send_certificate_request(s);
 422                                 if (ret <= 0) goto end;
 423 #ifndef NETSCAPE_HANG_BUG
 424                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 425 #else
 426                                 s->state=SSL3_ST_SW_FLUSH;
 427                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 428 #endif
 429                                 s->init_num=0;
 430                                 }
 431                         break;
 432
 433                 case SSL3_ST_SW_SRVR_DONE_A:
 434                 case SSL3_ST_SW_SRVR_DONE_B:
 435                         dtls1_start_timer(s);
 436                         ret=dtls1_send_server_done(s);
 437                         if (ret <= 0) goto end;
 438                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 439                         s->state=SSL3_ST_SW_FLUSH;
 440                         s->init_num=0;
 441                         break;
 442
 443                 case SSL3_ST_CW_FLUSH:
 444                         s->rwstate=SSL_WRITING;
 445                         if (BIO_flush(s->wbio) <= 0)
 446                                 {
 447                                 ret= -1;
 448                                 goto end;
 449                                 }
 450                         s->rwstate=SSL_NOTHING;
 451                         s->state=s->s3->tmp.next_state;
 452                         break;
 453
 454                 case SSL3_ST_SR_CERT_A:
 455                 case SSL3_ST_SR_CERT_B:
 456                         /* Check for second client hello (MS SGC) */
 457                         ret = ssl3_check_client_hello(s);
 458                         if (ret <= 0)
 459                                 goto end;
 460                         dtls1_stop_timer(s);
 461                         if (ret == 2)
 462                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 463                         else {
 464                                 /* could be sent for a DH cert, even if we
 465                                  * have not asked for it :-) */
 466                                 ret=ssl3_get_client_certificate(s);
 467                                 if (ret <= 0) goto end;
 468                                 dtls1_stop_timer(s);
 469                                 s->init_num=0;
 470                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 471                         }
 472                         break;
 473
 474                 case SSL3_ST_SR_KEY_EXCH_A:
 475                 case SSL3_ST_SR_KEY_EXCH_B:
 476                         ret=ssl3_get_client_key_exchange(s);
 477                         if (ret <= 0) goto end;
 478                         dtls1_stop_timer(s);
 479                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 480                         s->init_num=0;
 481
 482                         /* We need to get hashes here so if there is
 483                          * a client cert, it can be verified */
 484                         s->method->ssl3_enc->cert_verify_mac(s,
 485                                 &(s->s3->finish_dgst1),
 486                                 &(s->s3->tmp.cert_verify_md[0]));
 487                         s->method->ssl3_enc->cert_verify_mac(s,
 488                                 &(s->s3->finish_dgst2),
 489                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 490
 491                         break;
 492
 493                 case SSL3_ST_SR_CERT_VRFY_A:
 494                 case SSL3_ST_SR_CERT_VRFY_B:
 495
 496                         s->d1->change_cipher_spec_ok = 1;
 497                         /* we should decide if we expected this one */
 498                         ret=ssl3_get_cert_verify(s);
 499                         if (ret <= 0) goto end;
 500                         dtls1_stop_timer(s);
 501
 502                         s->state=SSL3_ST_SR_FINISHED_A;
 503                         s->init_num=0;
 504                         break;
 505
 506                 case SSL3_ST_SR_FINISHED_A:
 507                 case SSL3_ST_SR_FINISHED_B:
 508                         s->d1->change_cipher_spec_ok = 1;
 509                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 510                                 SSL3_ST_SR_FINISHED_B);
 511                         if (ret <= 0) goto end;
 512                         dtls1_stop_timer(s);
 513                         if (s->hit)
 514                                 s->state=SSL_ST_OK;
 515 #ifndef OPENSSL_NO_TLSEXT
 516                         else if (s->tlsext_ticket_expected)
 517                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 518 #endif
 519                         else
 520                                 s->state=SSL3_ST_SW_CHANGE_A;
 521                         s->init_num=0;
 522                         break;
 523
 524 #ifndef OPENSSL_NO_TLSEXT
 525                 case SSL3_ST_SW_SESSION_TICKET_A:
 526                 case SSL3_ST_SW_SESSION_TICKET_B:
 527                         ret=dtls1_send_newsession_ticket(s);
 528                         if (ret <= 0) goto end;
 529                         s->state=SSL3_ST_SW_CHANGE_A;
 530                         s->init_num=0;
 531                         break;
 532
 533                 case SSL3_ST_SW_CERT_STATUS_A:
 534                 case SSL3_ST_SW_CERT_STATUS_B:
 535                         ret=ssl3_send_cert_status(s);
 536                         if (ret <= 0) goto end;
 537                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 538                         s->init_num=0;
 539                         break;
 540
 541 #endif
 542
 543                 case SSL3_ST_SW_CHANGE_A:
 544                 case SSL3_ST_SW_CHANGE_B:
 545
 546                         s->session->cipher=s->s3->tmp.new_cipher;
 547                         if (!s->method->ssl3_enc->setup_key_block(s))
 548                                 { ret= -1; goto end; }
 549
 550                         ret=dtls1_send_change_cipher_spec(s,
 551                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 552
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_SW_FINISHED_A;
 555                         s->init_num=0;
 556
 557                         if (!s->method->ssl3_enc->change_cipher_state(s,
 558                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 559                                 {
 560                                 ret= -1;
 561                                 goto end;
 562                                 }
 563
 564                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 565                         break;
 566
 567                 case SSL3_ST_SW_FINISHED_A:
 568                 case SSL3_ST_SW_FINISHED_B:
 569                         ret=dtls1_send_finished(s,
 570                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 571                                 s->method->ssl3_enc->server_finished_label,
 572                                 s->method->ssl3_enc->server_finished_label_len);
 573                         if (ret <= 0) goto end;
 574                         s->state=SSL3_ST_SW_FLUSH;
 575                         if (s->hit)
 576                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 577                         else
 578                                 s->s3->tmp.next_state=SSL_ST_OK;
 579                         s->init_num=0;
 580                         break;
 581
 582                 case SSL_ST_OK:
 583                         /* clean a few things up */
 584                         ssl3_cleanup_key_block(s);
 585
 586 #if 0
 587                         BUF_MEM_free(s->init_buf);
 588                         s->init_buf=NULL;
 589 #endif
 590
 591                         /* remove buffering on output */
 592                         ssl_free_wbio_buffer(s);
 593
 594                         s->init_num=0;
 595
 596                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 597                                 {
 598                                 /* actually not necessarily a 'new' session unless
 599                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 600
 601                                 s->new_session=0;
 602
 603                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 604
 605                                 s->ctx->stats.sess_accept_good++;
 606                                 /* s->server=1; */
 607                                 s->handshake_func=dtls1_accept;
 608
 609                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 610                                 }
 611
 612                         ret = 1;
 613
 614                         /* done handshaking, next message is client hello */
 615                         s->d1->handshake_read_seq = 0;
 616                         /* next message is server hello */
 617                         s->d1->handshake_write_seq = 0;
 618                         s->d1->next_handshake_write_seq = 0;
 619                         goto end;
 620                         /* break; */
 621
 622                 default:
 623                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 624                         ret= -1;
 625                         goto end;
 626                         /* break; */
 627                         }
 628
 629                 if (!s->s3->tmp.reuse_message && !skip)
 630                         {
 631                         if (s->debug)
 632                                 {
 633                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 634                                         goto end;
 635                                 }
 636
 637
 638                         if ((cb != NULL) && (s->state != state))
 639                                 {
 640                                 new_state=s->state;
 641                                 s->state=state;
 642                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 643                                 s->state=new_state;
 644                                 }
 645                         }
 646                 skip=0;
 647                 }
 648 end:
 649         /* BIO_flush(s->wbio); */
 650
 651         s->in_handshake--;
 652         if (cb != NULL)
 653                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 654         return(ret);
 655         }
 656
 657 int dtls1_send_hello_request(SSL *s)
 658         {
 659         unsigned char *p;
 660
 661         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 662                 {
 663                 p=(unsigned char *)s->init_buf->data;
 664                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 665
 666                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 667                 /* number of bytes to write */
 668                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 669                 s->init_off=0;
 670
 671                 /* no need to buffer this message, since there are no retransmit
 672                  * requests for it */
 673                 }
 674
 675         /* SSL3_ST_SW_HELLO_REQ_B */
 676         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 677         }
 678
 679 int dtls1_send_hello_verify_request(SSL *s)
 680         {
 681         unsigned int msg_len;
 682         unsigned char *msg, *buf, *p;
 683
 684         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 685                 {
 686                 buf = (unsigned char *)s->init_buf->data;
 687
 688                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 689                 if (s->client_version == DTLS1_BAD_VER)
 690                         *(p++) = DTLS1_BAD_VER>>8,
 691                         *(p++) = DTLS1_BAD_VER&0xff;
 692                 else
 693                         *(p++) = s->version >> 8,
 694                         *(p++) = s->version & 0xFF;
 695
 696                 if (s->ctx->app_gen_cookie_cb == NULL ||
 697                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 698                          &(s->d1->cookie_len)) == 0)
 699                         {
 700                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 701                         return 0;
 702                         }
 703
 704                 *(p++) = (unsigned char) s->d1->cookie_len;
 705                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 706                 p += s->d1->cookie_len;
 707                 msg_len = p - msg;
 708
 709                 dtls1_set_message_header(s, buf,
 710                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 711
 712                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 713                 /* number of bytes to write */
 714                 s->init_num=p-buf;
 715                 s->init_off=0;
 716
 717                 /* buffer the message to handle re-xmits */
 718                 dtls1_buffer_message(s, 0);
 719                 }
 720
 721         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 722         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 723         }
 724
 725 int dtls1_send_server_hello(SSL *s)
 726         {
 727         unsigned char *buf;
 728         unsigned char *p,*d;
 729         int i;
 730         unsigned int sl;
 731         unsigned long l,Time;
 732
 733         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 734                 {
 735                 buf=(unsigned char *)s->init_buf->data;
 736                 p=s->s3->server_random;
 737                 Time=(unsigned long)time(NULL);                 /* Time */
 738                 l2n(Time,p);
 739                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 740                 /* Do the message type and length last */
 741                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 742
 743                 if (s->client_version == DTLS1_BAD_VER)
 744                         *(p++)=DTLS1_BAD_VER>>8,
 745                         *(p++)=DTLS1_BAD_VER&0xff;
 746                 else
 747                         *(p++)=s->version>>8,
 748                         *(p++)=s->version&0xff;
 749
 750                 /* Random stuff */
 751                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 752                 p+=SSL3_RANDOM_SIZE;
 753
 754                 /* now in theory we have 3 options to sending back the
 755                  * session id.  If it is a re-use, we send back the
 756                  * old session-id, if it is a new session, we send
 757                  * back the new session-id or we send back a 0 length
 758                  * session-id if we want it to be single use.
 759                  * Currently I will not implement the '0' length session-id
 760                  * 12-Jan-98 - I'll now support the '0' length stuff.
 761                  */
 762                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 763                         s->session->session_id_length=0;
 764
 765                 sl=s->session->session_id_length;
 766                 if (sl > sizeof s->session->session_id)
 767                         {
 768                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 769                         return -1;
 770                         }
 771                 *(p++)=sl;
 772                 memcpy(p,s->session->session_id,sl);
 773                 p+=sl;
 774
 775                 /* put the cipher */
 776                 if (s->s3->tmp.new_cipher == NULL)
 777                         return -1;
 778                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 779                 p+=i;
 780
 781                 /* put the compression method */
 782 #ifdef OPENSSL_NO_COMP
 783                 *(p++)=0;
 784 #else
 785                 if (s->s3->tmp.new_compression == NULL)
 786                         *(p++)=0;
 787                 else
 788                         *(p++)=s->s3->tmp.new_compression->id;
 789 #endif
 790
 791 #ifndef OPENSSL_NO_TLSEXT
 792                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 793                         {
 794                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 795                         return -1;
 796                         }
 797 #endif
 798
 799                 /* do the header */
 800                 l=(p-d);
 801                 d=buf;
 802
 803                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 804
 805                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 806                 /* number of bytes to write */
 807                 s->init_num=p-buf;
 808                 s->init_off=0;
 809
 810                 /* buffer the message to handle re-xmits */
 811                 dtls1_buffer_message(s, 0);
 812                 }
 813
 814         /* SSL3_ST_SW_SRVR_HELLO_B */
 815         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 816         }
 817
 818 int dtls1_send_server_done(SSL *s)
 819         {
 820         unsigned char *p;
 821
 822         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 823                 {
 824                 p=(unsigned char *)s->init_buf->data;
 825
 826                 /* do the header */
 827                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 828
 829                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 830                 /* number of bytes to write */
 831                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 832                 s->init_off=0;
 833
 834                 /* buffer the message to handle re-xmits */
 835                 dtls1_buffer_message(s, 0);
 836                 }
 837
 838         /* SSL3_ST_SW_SRVR_DONE_B */
 839         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 840         }
 841
 842 int dtls1_send_server_key_exchange(SSL *s)
 843         {
 844 #ifndef OPENSSL_NO_RSA
 845         unsigned char *q;
 846         int j,num;
 847         RSA *rsa;
 848         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 849         unsigned int u;
 850 #endif
 851 #ifndef OPENSSL_NO_DH
 852         DH *dh=NULL,*dhp;
 853 #endif
 854         EVP_PKEY *pkey;
 855         unsigned char *p,*d;
 856         int al,i;
 857         unsigned long type;
 858         int n;
 859         CERT *cert;
 860         BIGNUM *r[4];
 861         int nr[4],kn;
 862         BUF_MEM *buf;
 863         EVP_MD_CTX md_ctx;
 864
 865         EVP_MD_CTX_init(&md_ctx);
 866         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 867                 {
 868                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 869                 cert=s->cert;
 870
 871                 buf=s->init_buf;
 872
 873                 r[0]=r[1]=r[2]=r[3]=NULL;
 874                 n=0;
 875 #ifndef OPENSSL_NO_RSA
 876                 if (type & SSL_kRSA)
 877                         {
 878                         rsa=cert->rsa_tmp;
 879                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 880                                 {
 881                                 rsa=s->cert->rsa_tmp_cb(s,
 882                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 883                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 884                                 if(rsa == NULL)
 885                                 {
 886                                         al=SSL_AD_HANDSHAKE_FAILURE;
 887                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 888                                         goto f_err;
 889                                 }
 890                                 RSA_up_ref(rsa);
 891                                 cert->rsa_tmp=rsa;
 892                                 }
 893                         if (rsa == NULL)
 894                                 {
 895                                 al=SSL_AD_HANDSHAKE_FAILURE;
 896                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 897                                 goto f_err;
 898                                 }
 899                         r[0]=rsa->n;
 900                         r[1]=rsa->e;
 901                         s->s3->tmp.use_rsa_tmp=1;
 902                         }
 903                 else
 904 #endif
 905 #ifndef OPENSSL_NO_DH
 906                         if (type & SSL_kEDH)
 907                         {
 908                         dhp=cert->dh_tmp;
 909                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 910                                 dhp=s->cert->dh_tmp_cb(s,
 911                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 912                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 913                         if (dhp == NULL)
 914                                 {
 915                                 al=SSL_AD_HANDSHAKE_FAILURE;
 916                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 917                                 goto f_err;
 918                                 }
 919
 920                         if (s->s3->tmp.dh != NULL)
 921                                 {
 922                                 DH_free(dh);
 923                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 924                                 goto err;
 925                                 }
 926
 927                         if ((dh=DHparams_dup(dhp)) == NULL)
 928                                 {
 929                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 930                                 goto err;
 931                                 }
 932
 933                         s->s3->tmp.dh=dh;
 934                         if ((dhp->pub_key == NULL ||
 935                              dhp->priv_key == NULL ||
 936                              (s->options & SSL_OP_SINGLE_DH_USE)))
 937                                 {
 938                                 if(!DH_generate_key(dh))
 939                                     {
 940                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 941                                            ERR_R_DH_LIB);
 942                                     goto err;
 943                                     }
 944                                 }
 945                         else
 946                                 {
 947                                 dh->pub_key=BN_dup(dhp->pub_key);
 948                                 dh->priv_key=BN_dup(dhp->priv_key);
 949                                 if ((dh->pub_key == NULL) ||
 950                                         (dh->priv_key == NULL))
 951                                         {
 952                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 953                                         goto err;
 954                                         }
 955                                 }
 956                         r[0]=dh->p;
 957                         r[1]=dh->g;
 958                         r[2]=dh->pub_key;
 959                         }
 960                 else
 961 #endif
 962                         {
 963                         al=SSL_AD_HANDSHAKE_FAILURE;
 964                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 965                         goto f_err;
 966                         }
 967                 for (i=0; r[i] != NULL; i++)
 968                         {
 969                         nr[i]=BN_num_bytes(r[i]);
 970                         n+=2+nr[i];
 971                         }
 972
 973                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 974                         {
 975                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 976                                 == NULL)
 977                                 {
 978                                 al=SSL_AD_DECODE_ERROR;
 979                                 goto f_err;
 980                                 }
 981                         kn=EVP_PKEY_size(pkey);
 982                         }
 983                 else
 984                         {
 985                         pkey=NULL;
 986                         kn=0;
 987                         }
 988
 989                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 990                         {
 991                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 992                         goto err;
 993                         }
 994                 d=(unsigned char *)s->init_buf->data;
 995                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 996
 997                 for (i=0; r[i] != NULL; i++)
 998                         {
 999                         s2n(nr[i],p);
1000                         BN_bn2bin(r[i],p);
1001                         p+=nr[i];
1002                         }
1003
1004                 /* not anonymous */
1005                 if (pkey != NULL)
1006                         {
1007                         /* n is the length of the params, they start at
1008                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1009                          * at the end. */
1010 #ifndef OPENSSL_NO_RSA
1011                         if (pkey->type == EVP_PKEY_RSA)
1012                                 {
1013                                 q=md_buf;
1014                                 j=0;
1015                                 for (num=2; num > 0; num--)
1016                                         {
1017                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1018                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1019                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1020                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1021                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1022                                         EVP_DigestFinal_ex(&md_ctx,q,
1023                                                 (unsigned int *)&i);
1024                                         q+=i;
1025                                         j+=i;
1026                                         }
1027                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1028                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1029                                         {
1030                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1031                                         goto err;
1032                                         }
1033                                 s2n(u,p);
1034                                 n+=u+2;
1035                                 }
1036                         else
1037 #endif
1038 #if !defined(OPENSSL_NO_DSA)
1039                                 if (pkey->type == EVP_PKEY_DSA)
1040                                 {
1041                                 /* lets do DSS */
1042                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1043                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1044                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1045                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1046                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1047                                         (unsigned int *)&i,pkey))
1048                                         {
1049                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1050                                         goto err;
1051                                         }
1052                                 s2n(i,p);
1053                                 n+=i+2;
1054                                 }
1055                         else
1056 #endif
1057                                 {
1058                                 /* Is this error check actually needed? */
1059                                 al=SSL_AD_HANDSHAKE_FAILURE;
1060                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1061                                 goto f_err;
1062                                 }
1063                         }
1064
1065                 d = dtls1_set_message_header(s, d,
1066                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1067
1068                 /* we should now have things packed up, so lets send
1069                  * it off */
1070                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1071                 s->init_off=0;
1072
1073                 /* buffer the message to handle re-xmits */
1074                 dtls1_buffer_message(s, 0);
1075                 }
1076
1077         s->state = SSL3_ST_SW_KEY_EXCH_B;
1078         EVP_MD_CTX_cleanup(&md_ctx);
1079         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1080 f_err:
1081         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1082 err:
1083         EVP_MD_CTX_cleanup(&md_ctx);
1084         return(-1);
1085         }
1086
1087 int dtls1_send_certificate_request(SSL *s)
1088         {
1089         unsigned char *p,*d;
1090         int i,j,nl,off,n;
1091         STACK_OF(X509_NAME) *sk=NULL;
1092         X509_NAME *name;
1093         BUF_MEM *buf;
1094         unsigned int msg_len;
1095
1096         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1097                 {
1098                 buf=s->init_buf;
1099
1100                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1101
1102                 /* get the list of acceptable cert types */
1103                 p++;
1104                 n=ssl3_get_req_cert_type(s,p);
1105                 d[0]=n;
1106                 p+=n;
1107                 n++;
1108
1109                 off=n;
1110                 p+=2;
1111                 n+=2;
1112
1113                 sk=SSL_get_client_CA_list(s);
1114                 nl=0;
1115                 if (sk != NULL)
1116                         {
1117                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1118                                 {
1119                                 name=sk_X509_NAME_value(sk,i);
1120                                 j=i2d_X509_NAME(name,NULL);
1121                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1122                                         {
1123                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1124                                         goto err;
1125                                         }
1126                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1127                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1128                                         {
1129                                         s2n(j,p);
1130                                         i2d_X509_NAME(name,&p);
1131                                         n+=2+j;
1132                                         nl+=2+j;
1133                                         }
1134                                 else
1135                                         {
1136                                         d=p;
1137                                         i2d_X509_NAME(name,&p);
1138                                         j-=2; s2n(j,d); j+=2;
1139                                         n+=j;
1140                                         nl+=j;
1141                                         }
1142                                 }
1143                         }
1144                 /* else no CA names */
1145                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1146                 s2n(nl,p);
1147
1148                 d=(unsigned char *)buf->data;
1149                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1150                 l2n3(n,d);
1151                 s2n(s->d1->handshake_write_seq,d);
1152                 s->d1->handshake_write_seq++;
1153
1154                 /* we should now have things packed up, so lets send
1155                  * it off */
1156
1157                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1158                 s->init_off=0;
1159 #ifdef NETSCAPE_HANG_BUG
1160 /* XXX: what to do about this? */
1161                 p=(unsigned char *)s->init_buf->data + s->init_num;
1162
1163                 /* do the header */
1164                 *(p++)=SSL3_MT_SERVER_DONE;
1165                 *(p++)=0;
1166                 *(p++)=0;
1167                 *(p++)=0;
1168                 s->init_num += 4;
1169 #endif
1170
1171                 /* XDTLS:  set message header ? */
1172                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1173                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1174                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1175
1176                 /* buffer the message to handle re-xmits */
1177                 dtls1_buffer_message(s, 0);
1178
1179                 s->state = SSL3_ST_SW_CERT_REQ_B;
1180                 }
1181
1182         /* SSL3_ST_SW_CERT_REQ_B */
1183         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1184 err:
1185         return(-1);
1186         }
1187
1188 int dtls1_send_server_certificate(SSL *s)
1189         {
1190         unsigned long l;
1191         X509 *x;
1192
1193         if (s->state == SSL3_ST_SW_CERT_A)
1194                 {
1195                 x=ssl_get_server_send_cert(s);
1196                 if (x == NULL &&
1197                         /* VRS: allow null cert if auth == KRB5 */
1198                         (s->s3->tmp.new_cipher->algorithms
1199                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1200                         != (SSL_aKRB5|SSL_kKRB5))
1201                         {
1202                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1203                         return(0);
1204                         }
1205
1206                 l=dtls1_output_cert_chain(s,x);
1207                 s->state=SSL3_ST_SW_CERT_B;
1208                 s->init_num=(int)l;
1209                 s->init_off=0;
1210
1211                 /* buffer the message to handle re-xmits */
1212                 dtls1_buffer_message(s, 0);
1213                 }
1214
1215         /* SSL3_ST_SW_CERT_B */
1216         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1217         }
1218
1219 #ifndef OPENSSL_NO_TLSEXT
1220 int dtls1_send_newsession_ticket(SSL *s)
1221         {
1222         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1223                 {
1224                 unsigned char *p, *senc, *macstart;
1225                 int len, slen;
1226                 unsigned int hlen, msg_len;
1227                 EVP_CIPHER_CTX ctx;
1228                 HMAC_CTX hctx;
1229                 SSL_CTX *tctx = s->initial_ctx;
1230                 unsigned char iv[EVP_MAX_IV_LENGTH];
1231                 unsigned char key_name[16];
1232
1233                 /* get session encoding length */
1234                 slen = i2d_SSL_SESSION(s->session, NULL);
1235                 /* Some length values are 16 bits, so forget it if session is
1236                  * too long
1237                  */
1238                 if (slen > 0xFF00)
1239                         return -1;
1240                 /* Grow buffer if need be: the length calculation is as
1241                  * follows 12 (DTLS handshake message header) +
1242                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1243                  * 16 (key name) + max_iv_len (iv length) +
1244                  * session_length + max_enc_block_size (max encrypted session
1245                  * length) + max_md_size (HMAC).
1246                  */
1247                 if (!BUF_MEM_grow(s->init_buf,
1248                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1249                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1250                         return -1;
1251                 senc = OPENSSL_malloc(slen);
1252                 if (!senc)
1253                         return -1;
1254                 p = senc;
1255                 i2d_SSL_SESSION(s->session, &p);
1256
1257                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1258                 EVP_CIPHER_CTX_init(&ctx);
1259                 HMAC_CTX_init(&hctx);
1260                 /* Initialize HMAC and cipher contexts. If callback present
1261                  * it does all the work otherwise use generated values
1262                  * from parent ctx.
1263                  */
1264                 if (tctx->tlsext_ticket_key_cb)
1265                         {
1266                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1267                                                          &hctx, 1) < 0)
1268                                 {
1269                                 OPENSSL_free(senc);
1270                                 return -1;
1271                                 }
1272                         }
1273                 else
1274                         {
1275                         RAND_pseudo_bytes(iv, 16);
1276                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1277                                         tctx->tlsext_tick_aes_key, iv);
1278                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1279                                         tlsext_tick_md(), NULL);
1280                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1281                         }
1282                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1283                 /* Skip ticket length for now */
1284                 p += 2;
1285                 /* Output key name */
1286                 macstart = p;
1287                 memcpy(p, key_name, 16);
1288                 p += 16;
1289                 /* output IV */
1290                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1291                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1292                 /* Encrypt session data */
1293                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1294                 p += len;
1295                 EVP_EncryptFinal(&ctx, p, &len);
1296                 p += len;
1297                 EVP_CIPHER_CTX_cleanup(&ctx);
1298
1299                 HMAC_Update(&hctx, macstart, p - macstart);
1300                 HMAC_Final(&hctx, p, &hlen);
1301                 HMAC_CTX_cleanup(&hctx);
1302
1303                 p += hlen;
1304                 /* Now write out lengths: p points to end of data written */
1305                 /* Total length */
1306                 len = p - (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1307                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1308                 s2n(len - 18, p);  /* Ticket length */
1309
1310                 /* number of bytes to write */
1311                 s->init_num= len;
1312                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1313                 s->init_off=0;
1314                 OPENSSL_free(senc);
1315
1316                 /* XDTLS:  set message header ? */
1317                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1318                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1319                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1320
1321                 /* buffer the message to handle re-xmits */
1322                 dtls1_buffer_message(s, 0);
1323                 }
1324
1325         /* SSL3_ST_SW_SESSION_TICKET_B */
1326         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1327         }
1328 #endif