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         int listen;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         listen = s->d1->listen;
 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         s->d1->listen = listen;
 169
 170         if (s->cert == NULL)
 171                 {
 172                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 173                 return(-1);
 174                 }
 175
 176         for (;;)
 177                 {
 178                 state=s->state;
 179
 180                 switch (s->state)
 181                         {
 182                 case SSL_ST_RENEGOTIATE:
 183                         s->new_session=1;
 184                         /* s->state=SSL_ST_ACCEPT; */
 185
 186                 case SSL_ST_BEFORE:
 187                 case SSL_ST_ACCEPT:
 188                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 189                 case SSL_ST_OK|SSL_ST_ACCEPT:
 190
 191                         s->server=1;
 192                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 193
 194                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 195                                 {
 196                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 197                                 return -1;
 198                                 }
 199                         s->type=SSL_ST_ACCEPT;
 200
 201                         if (s->init_buf == NULL)
 202                                 {
 203                                 if ((buf=BUF_MEM_new()) == NULL)
 204                                         {
 205                                         ret= -1;
 206                                         goto end;
 207                                         }
 208                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 209                                         {
 210                                         ret= -1;
 211                                         goto end;
 212                                         }
 213                                 s->init_buf=buf;
 214                                 }
 215
 216                         if (!ssl3_setup_buffers(s))
 217                                 {
 218                                 ret= -1;
 219                                 goto end;
 220                                 }
 221
 222                         s->init_num=0;
 223
 224                         if (s->state != SSL_ST_RENEGOTIATE)
 225                                 {
 226                                 /* Ok, we now need to push on a buffering BIO so that
 227                                  * the output is sent in a way that TCP likes :-)
 228                                  */
 229                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 230
 231                                 ssl3_init_finished_mac(s);
 232                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 233                                 s->ctx->stats.sess_accept++;
 234                                 }
 235                         else
 236                                 {
 237                                 /* s->state == SSL_ST_RENEGOTIATE,
 238                                  * we will just send a HelloRequest */
 239                                 s->ctx->stats.sess_accept_renegotiate++;
 240                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 241                                 }
 242
 243                         break;
 244
 245                 case SSL3_ST_SW_HELLO_REQ_A:
 246                 case SSL3_ST_SW_HELLO_REQ_B:
 247
 248                         s->shutdown=0;
 249                         dtls1_clear_record_buffer(s);
 250                         dtls1_start_timer(s);
 251                         ret=dtls1_send_hello_request(s);
 252                         if (ret <= 0) goto end;
 253                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 254                         s->state=SSL3_ST_SW_FLUSH;
 255                         s->init_num=0;
 256
 257                         ssl3_init_finished_mac(s);
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_C:
 261                         s->state=SSL_ST_OK;
 262                         break;
 263
 264                 case SSL3_ST_SR_CLNT_HELLO_A:
 265                 case SSL3_ST_SR_CLNT_HELLO_B:
 266                 case SSL3_ST_SR_CLNT_HELLO_C:
 267
 268                         s->shutdown=0;
 269                         ret=ssl3_get_client_hello(s);
 270                         if (ret <= 0) goto end;
 271                         dtls1_stop_timer(s);
 272
 273                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 274                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 275                         else
 276                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 277
 278                         s->init_num=0;
 279
 280                         /* Reflect ClientHello sequence to remain stateless while listening */
 281                         if (listen)
 282                                 {
 283                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
 284                                 }
 285
 286                         /* If we're just listening, stop here */
 287                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 288                                 {
 289                                 ret = 2;
 290                                 s->d1->listen = 0;
 291                                 /* Set expected sequence numbers
 292                                  * to continue the handshake.
 293                                  */
 294                                 s->d1->handshake_read_seq = 2;
 295                                 s->d1->handshake_write_seq = 1;
 296                                 s->d1->next_handshake_write_seq = 1;
 297                                 goto end;
 298                                 }
 299
 300                         break;
 301
 302                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 303                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 304
 305                         ret = dtls1_send_hello_verify_request(s);
 306                         if ( ret <= 0) goto end;
 307                         s->state=SSL3_ST_SW_FLUSH;
 308                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 309
 310                         /* HelloVerifyRequests resets Finished MAC */
 311                         if (s->client_version != DTLS1_BAD_VER)
 312                                 ssl3_init_finished_mac(s);
 313                         break;
 314
 315                 case SSL3_ST_SW_SRVR_HELLO_A:
 316                 case SSL3_ST_SW_SRVR_HELLO_B:
 317                         s->new_session = 2;
 318                         dtls1_start_timer(s);
 319                         ret=dtls1_send_server_hello(s);
 320                         if (ret <= 0) goto end;
 321
 322 #ifndef OPENSSL_NO_TLSEXT
 323                         if (s->hit)
 324                                 {
 325                                 if (s->tlsext_ticket_expected)
 326                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 327                                 else
 328                                         s->state=SSL3_ST_SW_CHANGE_A;
 329                                 }
 330 #else
 331                         if (s->hit)
 332                                         s->state=SSL3_ST_SW_CHANGE_A;
 333 #endif
 334                         else
 335                                 s->state=SSL3_ST_SW_CERT_A;
 336                         s->init_num=0;
 337                         break;
 338
 339                 case SSL3_ST_SW_CERT_A:
 340                 case SSL3_ST_SW_CERT_B:
 341                         /* Check if it is anon DH */
 342                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 343                                 {
 344                                 dtls1_start_timer(s);
 345                                 ret=dtls1_send_server_certificate(s);
 346                                 if (ret <= 0) goto end;
 347 #ifndef OPENSSL_NO_TLSEXT
 348                                 if (s->tlsext_status_expected)
 349                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 350                                 else
 351                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 352                                 }
 353                         else
 354                                 {
 355                                 skip = 1;
 356                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 357                                 }
 358 #else
 359                                 }
 360                         else
 361                                 skip=1;
 362
 363                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 364 #endif
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_SW_KEY_EXCH_A:
 369                 case SSL3_ST_SW_KEY_EXCH_B:
 370                         l=s->s3->tmp.new_cipher->algorithms;
 371
 372                         /* clear this, it may get reset by
 373                          * send_server_key_exchange */
 374                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 375 #ifndef OPENSSL_NO_KRB5
 376                                 && !(l & SSL_KRB5)
 377 #endif /* OPENSSL_NO_KRB5 */
 378                                 )
 379                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 380                                  * even when forbidden by protocol specs
 381                                  * (handshake may fail as clients are not required to
 382                                  * be able to handle this) */
 383                                 s->s3->tmp.use_rsa_tmp=1;
 384                         else
 385                                 s->s3->tmp.use_rsa_tmp=0;
 386
 387                         /* only send if a DH key exchange, fortezza or
 388                          * RSA but we have a sign only certificate */
 389                         if (s->s3->tmp.use_rsa_tmp
 390                             || (l & (SSL_DH|SSL_kFZA))
 391                             || ((l & SSL_kRSA)
 392                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 393                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 394                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 395                                         )
 396                                     )
 397                                 )
 398                             )
 399                                 {
 400                                 dtls1_start_timer(s);
 401                                 ret=dtls1_send_server_key_exchange(s);
 402                                 if (ret <= 0) goto end;
 403                                 }
 404                         else
 405                                 skip=1;
 406
 407                         s->state=SSL3_ST_SW_CERT_REQ_A;
 408                         s->init_num=0;
 409                         break;
 410
 411                 case SSL3_ST_SW_CERT_REQ_A:
 412                 case SSL3_ST_SW_CERT_REQ_B:
 413                         if (/* don't request cert unless asked for it: */
 414                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 415                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 416                                  * don't request cert during re-negotiation: */
 417                                 ((s->session->peer != NULL) &&
 418                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 419                                 /* never request cert in anonymous ciphersuites
 420                                  * (see section "Certificate request" in SSL 3 drafts
 421                                  * and in RFC 2246): */
 422                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 423                                  /* ... except when the application insists on verification
 424                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 425                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 426                                  /* never request cert in Kerberos ciphersuites */
 427                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 428                                 {
 429                                 /* no cert request */
 430                                 skip=1;
 431                                 s->s3->tmp.cert_request=0;
 432                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 433                                 }
 434                         else
 435                                 {
 436                                 s->s3->tmp.cert_request=1;
 437                                 dtls1_start_timer(s);
 438                                 ret=dtls1_send_certificate_request(s);
 439                                 if (ret <= 0) goto end;
 440 #ifndef NETSCAPE_HANG_BUG
 441                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 442 #else
 443                                 s->state=SSL3_ST_SW_FLUSH;
 444                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 445 #endif
 446                                 s->init_num=0;
 447                                 }
 448                         break;
 449
 450                 case SSL3_ST_SW_SRVR_DONE_A:
 451                 case SSL3_ST_SW_SRVR_DONE_B:
 452                         dtls1_start_timer(s);
 453                         ret=dtls1_send_server_done(s);
 454                         if (ret <= 0) goto end;
 455                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 456                         s->state=SSL3_ST_SW_FLUSH;
 457                         s->init_num=0;
 458                         break;
 459
 460                 case SSL3_ST_SW_FLUSH:
 461                         s->rwstate=SSL_WRITING;
 462                         if (BIO_flush(s->wbio) <= 0)
 463                                 {
 464                                 ret= -1;
 465                                 goto end;
 466                                 }
 467                         s->rwstate=SSL_NOTHING;
 468                         s->state=s->s3->tmp.next_state;
 469                         break;
 470
 471                 case SSL3_ST_SR_CERT_A:
 472                 case SSL3_ST_SR_CERT_B:
 473                         /* Check for second client hello (MS SGC) */
 474                         ret = ssl3_check_client_hello(s);
 475                         if (ret <= 0)
 476                                 goto end;
 477                         if (ret == 2)
 478                                 {
 479                                 dtls1_stop_timer(s);
 480                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 481                                 }
 482                         else {
 483                                 if (s->s3->tmp.cert_request)
 484                                         {
 485                                         ret=ssl3_get_client_certificate(s);
 486                                         if (ret <= 0) goto end;
 487                                         }
 488                                 s->init_num=0;
 489                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 490                         }
 491                         break;
 492
 493                 case SSL3_ST_SR_KEY_EXCH_A:
 494                 case SSL3_ST_SR_KEY_EXCH_B:
 495                         ret=ssl3_get_client_key_exchange(s);
 496                         if (ret <= 0) goto end;
 497                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 498                         s->init_num=0;
 499
 500                         /* We need to get hashes here so if there is
 501                          * a client cert, it can be verified */
 502                         s->method->ssl3_enc->cert_verify_mac(s,
 503                                 &(s->s3->finish_dgst1),
 504                                 &(s->s3->tmp.cert_verify_md[0]));
 505                         s->method->ssl3_enc->cert_verify_mac(s,
 506                                 &(s->s3->finish_dgst2),
 507                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 508
 509                         break;
 510
 511                 case SSL3_ST_SR_CERT_VRFY_A:
 512                 case SSL3_ST_SR_CERT_VRFY_B:
 513
 514                         s->d1->change_cipher_spec_ok = 1;
 515                         /* we should decide if we expected this one */
 516                         ret=ssl3_get_cert_verify(s);
 517                         if (ret <= 0) goto end;
 518
 519                         s->state=SSL3_ST_SR_FINISHED_A;
 520                         s->init_num=0;
 521                         break;
 522
 523                 case SSL3_ST_SR_FINISHED_A:
 524                 case SSL3_ST_SR_FINISHED_B:
 525                         s->d1->change_cipher_spec_ok = 1;
 526                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 527                                 SSL3_ST_SR_FINISHED_B);
 528                         if (ret <= 0) goto end;
 529                         dtls1_stop_timer(s);
 530                         if (s->hit)
 531                                 s->state=SSL_ST_OK;
 532 #ifndef OPENSSL_NO_TLSEXT
 533                         else if (s->tlsext_ticket_expected)
 534                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 535 #endif
 536                         else
 537                                 s->state=SSL3_ST_SW_CHANGE_A;
 538                         s->init_num=0;
 539                         break;
 540
 541 #ifndef OPENSSL_NO_TLSEXT
 542                 case SSL3_ST_SW_SESSION_TICKET_A:
 543                 case SSL3_ST_SW_SESSION_TICKET_B:
 544                         ret=dtls1_send_newsession_ticket(s);
 545                         if (ret <= 0) goto end;
 546                         s->state=SSL3_ST_SW_CHANGE_A;
 547                         s->init_num=0;
 548                         break;
 549
 550                 case SSL3_ST_SW_CERT_STATUS_A:
 551                 case SSL3_ST_SW_CERT_STATUS_B:
 552                         ret=ssl3_send_cert_status(s);
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 555                         s->init_num=0;
 556                         break;
 557
 558 #endif
 559
 560                 case SSL3_ST_SW_CHANGE_A:
 561                 case SSL3_ST_SW_CHANGE_B:
 562
 563                         s->session->cipher=s->s3->tmp.new_cipher;
 564                         if (!s->method->ssl3_enc->setup_key_block(s))
 565                                 { ret= -1; goto end; }
 566
 567                         ret=dtls1_send_change_cipher_spec(s,
 568                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 569
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_SW_FINISHED_A;
 572                         s->init_num=0;
 573
 574                         if (!s->method->ssl3_enc->change_cipher_state(s,
 575                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 576                                 {
 577                                 ret= -1;
 578                                 goto end;
 579                                 }
 580
 581                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 582                         break;
 583
 584                 case SSL3_ST_SW_FINISHED_A:
 585                 case SSL3_ST_SW_FINISHED_B:
 586                         ret=dtls1_send_finished(s,
 587                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 588                                 s->method->ssl3_enc->server_finished_label,
 589                                 s->method->ssl3_enc->server_finished_label_len);
 590                         if (ret <= 0) goto end;
 591                         s->state=SSL3_ST_SW_FLUSH;
 592                         if (s->hit)
 593                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 594                         else
 595                                 s->s3->tmp.next_state=SSL_ST_OK;
 596                         s->init_num=0;
 597                         break;
 598
 599                 case SSL_ST_OK:
 600                         /* clean a few things up */
 601                         ssl3_cleanup_key_block(s);
 602
 603 #if 0
 604                         BUF_MEM_free(s->init_buf);
 605                         s->init_buf=NULL;
 606 #endif
 607
 608                         /* remove buffering on output */
 609                         ssl_free_wbio_buffer(s);
 610
 611                         s->init_num=0;
 612
 613                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 614                                 {
 615                                 /* actually not necessarily a 'new' session unless
 616                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 617
 618                                 s->new_session=0;
 619
 620                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 621
 622                                 s->ctx->stats.sess_accept_good++;
 623                                 /* s->server=1; */
 624                                 s->handshake_func=dtls1_accept;
 625
 626                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 627                                 }
 628
 629                         ret = 1;
 630
 631                         /* done handshaking, next message is client hello */
 632                         s->d1->handshake_read_seq = 0;
 633                         /* next message is server hello */
 634                         s->d1->handshake_write_seq = 0;
 635                         s->d1->next_handshake_write_seq = 0;
 636                         goto end;
 637                         /* break; */
 638
 639                 default:
 640                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 641                         ret= -1;
 642                         goto end;
 643                         /* break; */
 644                         }
 645
 646                 if (!s->s3->tmp.reuse_message && !skip)
 647                         {
 648                         if (s->debug)
 649                                 {
 650                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 651                                         goto end;
 652                                 }
 653
 654
 655                         if ((cb != NULL) && (s->state != state))
 656                                 {
 657                                 new_state=s->state;
 658                                 s->state=state;
 659                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 660                                 s->state=new_state;
 661                                 }
 662                         }
 663                 skip=0;
 664                 }
 665 end:
 666         /* BIO_flush(s->wbio); */
 667
 668         s->in_handshake--;
 669         if (cb != NULL)
 670                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 671         return(ret);
 672         }
 673
 674 int dtls1_send_hello_request(SSL *s)
 675         {
 676         unsigned char *p;
 677
 678         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 679                 {
 680                 p=(unsigned char *)s->init_buf->data;
 681                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 682
 683                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 684                 /* number of bytes to write */
 685                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 686                 s->init_off=0;
 687
 688                 /* no need to buffer this message, since there are no retransmit
 689                  * requests for it */
 690                 }
 691
 692         /* SSL3_ST_SW_HELLO_REQ_B */
 693         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 694         }
 695
 696 int dtls1_send_hello_verify_request(SSL *s)
 697         {
 698         unsigned int msg_len;
 699         unsigned char *msg, *buf, *p;
 700
 701         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 702                 {
 703                 buf = (unsigned char *)s->init_buf->data;
 704
 705                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 706                 if (s->client_version == DTLS1_BAD_VER)
 707                         *(p++) = DTLS1_BAD_VER>>8,
 708                         *(p++) = DTLS1_BAD_VER&0xff;
 709                 else
 710                         *(p++) = s->version >> 8,
 711                         *(p++) = s->version & 0xFF;
 712
 713                 if (s->ctx->app_gen_cookie_cb == NULL ||
 714                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 715                          &(s->d1->cookie_len)) == 0)
 716                         {
 717                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 718                         return 0;
 719                         }
 720
 721                 *(p++) = (unsigned char) s->d1->cookie_len;
 722                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 723                 p += s->d1->cookie_len;
 724                 msg_len = p - msg;
 725
 726                 dtls1_set_message_header(s, buf,
 727                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 728
 729                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 730                 /* number of bytes to write */
 731                 s->init_num=p-buf;
 732                 s->init_off=0;
 733                 }
 734
 735         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 736         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 737         }
 738
 739 int dtls1_send_server_hello(SSL *s)
 740         {
 741         unsigned char *buf;
 742         unsigned char *p,*d;
 743         int i;
 744         unsigned int sl;
 745         unsigned long l,Time;
 746
 747         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 748                 {
 749                 buf=(unsigned char *)s->init_buf->data;
 750                 p=s->s3->server_random;
 751                 Time=(unsigned long)time(NULL);                 /* Time */
 752                 l2n(Time,p);
 753                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
 754                 /* Do the message type and length last */
 755                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 756
 757                 if (s->client_version == DTLS1_BAD_VER)
 758                         *(p++)=DTLS1_BAD_VER>>8,
 759                         *(p++)=DTLS1_BAD_VER&0xff;
 760                 else
 761                         *(p++)=s->version>>8,
 762                         *(p++)=s->version&0xff;
 763
 764                 /* Random stuff */
 765                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 766                 p+=SSL3_RANDOM_SIZE;
 767
 768                 /* now in theory we have 3 options to sending back the
 769                  * session id.  If it is a re-use, we send back the
 770                  * old session-id, if it is a new session, we send
 771                  * back the new session-id or we send back a 0 length
 772                  * session-id if we want it to be single use.
 773                  * Currently I will not implement the '0' length session-id
 774                  * 12-Jan-98 - I'll now support the '0' length stuff.
 775                  */
 776                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 777                         s->session->session_id_length=0;
 778
 779                 sl=s->session->session_id_length;
 780                 if (sl > sizeof s->session->session_id)
 781                         {
 782                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 783                         return -1;
 784                         }
 785                 *(p++)=sl;
 786                 memcpy(p,s->session->session_id,sl);
 787                 p+=sl;
 788
 789                 /* put the cipher */
 790                 if (s->s3->tmp.new_cipher == NULL)
 791                         return -1;
 792                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 793                 p+=i;
 794
 795                 /* put the compression method */
 796 #ifdef OPENSSL_NO_COMP
 797                 *(p++)=0;
 798 #else
 799                 if (s->s3->tmp.new_compression == NULL)
 800                         *(p++)=0;
 801                 else
 802                         *(p++)=s->s3->tmp.new_compression->id;
 803 #endif
 804
 805 #ifndef OPENSSL_NO_TLSEXT
 806                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 807                         {
 808                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 809                         return -1;
 810                         }
 811 #endif
 812
 813                 /* do the header */
 814                 l=(p-d);
 815                 d=buf;
 816
 817                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 818
 819                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 820                 /* number of bytes to write */
 821                 s->init_num=p-buf;
 822                 s->init_off=0;
 823
 824                 /* buffer the message to handle re-xmits */
 825                 dtls1_buffer_message(s, 0);
 826                 }
 827
 828         /* SSL3_ST_SW_SRVR_HELLO_B */
 829         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 830         }
 831
 832 int dtls1_send_server_done(SSL *s)
 833         {
 834         unsigned char *p;
 835
 836         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 837                 {
 838                 p=(unsigned char *)s->init_buf->data;
 839
 840                 /* do the header */
 841                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 842
 843                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 844                 /* number of bytes to write */
 845                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 846                 s->init_off=0;
 847
 848                 /* buffer the message to handle re-xmits */
 849                 dtls1_buffer_message(s, 0);
 850                 }
 851
 852         /* SSL3_ST_SW_SRVR_DONE_B */
 853         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 854         }
 855
 856 int dtls1_send_server_key_exchange(SSL *s)
 857         {
 858 #ifndef OPENSSL_NO_RSA
 859         unsigned char *q;
 860         int j,num;
 861         RSA *rsa;
 862         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 863         unsigned int u;
 864 #endif
 865 #ifndef OPENSSL_NO_DH
 866         DH *dh=NULL,*dhp;
 867 #endif
 868         EVP_PKEY *pkey;
 869         unsigned char *p,*d;
 870         int al,i;
 871         unsigned long type;
 872         int n;
 873         CERT *cert;
 874         BIGNUM *r[4];
 875         int nr[4],kn;
 876         BUF_MEM *buf;
 877         EVP_MD_CTX md_ctx;
 878
 879         EVP_MD_CTX_init(&md_ctx);
 880         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 881                 {
 882                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 883                 cert=s->cert;
 884
 885                 buf=s->init_buf;
 886
 887                 r[0]=r[1]=r[2]=r[3]=NULL;
 888                 n=0;
 889 #ifndef OPENSSL_NO_RSA
 890                 if (type & SSL_kRSA)
 891                         {
 892                         rsa=cert->rsa_tmp;
 893                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 894                                 {
 895                                 rsa=s->cert->rsa_tmp_cb(s,
 896                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 897                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 898                                 if(rsa == NULL)
 899                                 {
 900                                         al=SSL_AD_HANDSHAKE_FAILURE;
 901                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 902                                         goto f_err;
 903                                 }
 904                                 RSA_up_ref(rsa);
 905                                 cert->rsa_tmp=rsa;
 906                                 }
 907                         if (rsa == NULL)
 908                                 {
 909                                 al=SSL_AD_HANDSHAKE_FAILURE;
 910                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 911                                 goto f_err;
 912                                 }
 913                         r[0]=rsa->n;
 914                         r[1]=rsa->e;
 915                         s->s3->tmp.use_rsa_tmp=1;
 916                         }
 917                 else
 918 #endif
 919 #ifndef OPENSSL_NO_DH
 920                         if (type & SSL_kEDH)
 921                         {
 922                         dhp=cert->dh_tmp;
 923                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 924                                 dhp=s->cert->dh_tmp_cb(s,
 925                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 926                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 927                         if (dhp == NULL)
 928                                 {
 929                                 al=SSL_AD_HANDSHAKE_FAILURE;
 930                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 931                                 goto f_err;
 932                                 }
 933
 934                         if (s->s3->tmp.dh != NULL)
 935                                 {
 936                                 DH_free(dh);
 937                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 938                                 goto err;
 939                                 }
 940
 941                         if ((dh=DHparams_dup(dhp)) == NULL)
 942                                 {
 943                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 944                                 goto err;
 945                                 }
 946
 947                         s->s3->tmp.dh=dh;
 948                         if ((dhp->pub_key == NULL ||
 949                              dhp->priv_key == NULL ||
 950                              (s->options & SSL_OP_SINGLE_DH_USE)))
 951                                 {
 952                                 if(!DH_generate_key(dh))
 953                                     {
 954                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 955                                            ERR_R_DH_LIB);
 956                                     goto err;
 957                                     }
 958                                 }
 959                         else
 960                                 {
 961                                 dh->pub_key=BN_dup(dhp->pub_key);
 962                                 dh->priv_key=BN_dup(dhp->priv_key);
 963                                 if ((dh->pub_key == NULL) ||
 964                                         (dh->priv_key == NULL))
 965                                         {
 966                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 967                                         goto err;
 968                                         }
 969                                 }
 970                         r[0]=dh->p;
 971                         r[1]=dh->g;
 972                         r[2]=dh->pub_key;
 973                         }
 974                 else
 975 #endif
 976                         {
 977                         al=SSL_AD_HANDSHAKE_FAILURE;
 978                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 979                         goto f_err;
 980                         }
 981                 for (i=0; r[i] != NULL; i++)
 982                         {
 983                         nr[i]=BN_num_bytes(r[i]);
 984                         n+=2+nr[i];
 985                         }
 986
 987                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 988                         {
 989                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 990                                 == NULL)
 991                                 {
 992                                 al=SSL_AD_DECODE_ERROR;
 993                                 goto f_err;
 994                                 }
 995                         kn=EVP_PKEY_size(pkey);
 996                         }
 997                 else
 998                         {
 999                         pkey=NULL;
1000                         kn=0;
1001                         }
1002
1003                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1004                         {
1005                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1006                         goto err;
1007                         }
1008                 d=(unsigned char *)s->init_buf->data;
1009                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1010
1011                 for (i=0; r[i] != NULL; i++)
1012                         {
1013                         s2n(nr[i],p);
1014                         BN_bn2bin(r[i],p);
1015                         p+=nr[i];
1016                         }
1017
1018                 /* not anonymous */
1019                 if (pkey != NULL)
1020                         {
1021                         /* n is the length of the params, they start at
1022                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1023                          * at the end. */
1024 #ifndef OPENSSL_NO_RSA
1025                         if (pkey->type == EVP_PKEY_RSA)
1026                                 {
1027                                 q=md_buf;
1028                                 j=0;
1029                                 for (num=2; num > 0; num--)
1030                                         {
1031                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1032                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1033                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1034                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1035                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1036                                         EVP_DigestFinal_ex(&md_ctx,q,
1037                                                 (unsigned int *)&i);
1038                                         q+=i;
1039                                         j+=i;
1040                                         }
1041                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1042                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1043                                         {
1044                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1045                                         goto err;
1046                                         }
1047                                 s2n(u,p);
1048                                 n+=u+2;
1049                                 }
1050                         else
1051 #endif
1052 #if !defined(OPENSSL_NO_DSA)
1053                                 if (pkey->type == EVP_PKEY_DSA)
1054                                 {
1055                                 /* lets do DSS */
1056                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1057                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1058                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1059                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1060                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1061                                         (unsigned int *)&i,pkey))
1062                                         {
1063                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1064                                         goto err;
1065                                         }
1066                                 s2n(i,p);
1067                                 n+=i+2;
1068                                 }
1069                         else
1070 #endif
1071                                 {
1072                                 /* Is this error check actually needed? */
1073                                 al=SSL_AD_HANDSHAKE_FAILURE;
1074                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1075                                 goto f_err;
1076                                 }
1077                         }
1078
1079                 d = dtls1_set_message_header(s, d,
1080                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1081
1082                 /* we should now have things packed up, so lets send
1083                  * it off */
1084                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1085                 s->init_off=0;
1086
1087                 /* buffer the message to handle re-xmits */
1088                 dtls1_buffer_message(s, 0);
1089                 }
1090
1091         s->state = SSL3_ST_SW_KEY_EXCH_B;
1092         EVP_MD_CTX_cleanup(&md_ctx);
1093         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1094 f_err:
1095         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1096 err:
1097         EVP_MD_CTX_cleanup(&md_ctx);
1098         return(-1);
1099         }
1100
1101 int dtls1_send_certificate_request(SSL *s)
1102         {
1103         unsigned char *p,*d;
1104         int i,j,nl,off,n;
1105         STACK_OF(X509_NAME) *sk=NULL;
1106         X509_NAME *name;
1107         BUF_MEM *buf;
1108         unsigned int msg_len;
1109
1110         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1111                 {
1112                 buf=s->init_buf;
1113
1114                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1115
1116                 /* get the list of acceptable cert types */
1117                 p++;
1118                 n=ssl3_get_req_cert_type(s,p);
1119                 d[0]=n;
1120                 p+=n;
1121                 n++;
1122
1123                 off=n;
1124                 p+=2;
1125                 n+=2;
1126
1127                 sk=SSL_get_client_CA_list(s);
1128                 nl=0;
1129                 if (sk != NULL)
1130                         {
1131                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1132                                 {
1133                                 name=sk_X509_NAME_value(sk,i);
1134                                 j=i2d_X509_NAME(name,NULL);
1135                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1136                                         {
1137                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1138                                         goto err;
1139                                         }
1140                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1141                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1142                                         {
1143                                         s2n(j,p);
1144                                         i2d_X509_NAME(name,&p);
1145                                         n+=2+j;
1146                                         nl+=2+j;
1147                                         }
1148                                 else
1149                                         {
1150                                         d=p;
1151                                         i2d_X509_NAME(name,&p);
1152                                         j-=2; s2n(j,d); j+=2;
1153                                         n+=j;
1154                                         nl+=j;
1155                                         }
1156                                 }
1157                         }
1158                 /* else no CA names */
1159                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1160                 s2n(nl,p);
1161
1162                 d=(unsigned char *)buf->data;
1163                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1164                 l2n3(n,d);
1165                 s2n(s->d1->handshake_write_seq,d);
1166                 s->d1->handshake_write_seq++;
1167
1168                 /* we should now have things packed up, so lets send
1169                  * it off */
1170
1171                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1172                 s->init_off=0;
1173 #ifdef NETSCAPE_HANG_BUG
1174 /* XXX: what to do about this? */
1175                 p=(unsigned char *)s->init_buf->data + s->init_num;
1176
1177                 /* do the header */
1178                 *(p++)=SSL3_MT_SERVER_DONE;
1179                 *(p++)=0;
1180                 *(p++)=0;
1181                 *(p++)=0;
1182                 s->init_num += 4;
1183 #endif
1184
1185                 /* XDTLS:  set message header ? */
1186                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1187                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1188                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1189
1190                 /* buffer the message to handle re-xmits */
1191                 dtls1_buffer_message(s, 0);
1192
1193                 s->state = SSL3_ST_SW_CERT_REQ_B;
1194                 }
1195
1196         /* SSL3_ST_SW_CERT_REQ_B */
1197         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1198 err:
1199         return(-1);
1200         }
1201
1202 int dtls1_send_server_certificate(SSL *s)
1203         {
1204         unsigned long l;
1205         X509 *x;
1206
1207         if (s->state == SSL3_ST_SW_CERT_A)
1208                 {
1209                 x=ssl_get_server_send_cert(s);
1210                 if (x == NULL &&
1211                         /* VRS: allow null cert if auth == KRB5 */
1212                         (s->s3->tmp.new_cipher->algorithms
1213                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1214                         != (SSL_aKRB5|SSL_kKRB5))
1215                         {
1216                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1217                         return(0);
1218                         }
1219
1220                 l=dtls1_output_cert_chain(s,x);
1221                 s->state=SSL3_ST_SW_CERT_B;
1222                 s->init_num=(int)l;
1223                 s->init_off=0;
1224
1225                 /* buffer the message to handle re-xmits */
1226                 dtls1_buffer_message(s, 0);
1227                 }
1228
1229         /* SSL3_ST_SW_CERT_B */
1230         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1231         }
1232
1233 #ifndef OPENSSL_NO_TLSEXT
1234 int dtls1_send_newsession_ticket(SSL *s)
1235         {
1236         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1237                 {
1238                 unsigned char *p, *senc, *macstart;
1239                 int len, slen;
1240                 unsigned int hlen, msg_len;
1241                 EVP_CIPHER_CTX ctx;
1242                 HMAC_CTX hctx;
1243                 SSL_CTX *tctx = s->initial_ctx;
1244                 unsigned char iv[EVP_MAX_IV_LENGTH];
1245                 unsigned char key_name[16];
1246
1247                 /* get session encoding length */
1248                 slen = i2d_SSL_SESSION(s->session, NULL);
1249                 /* Some length values are 16 bits, so forget it if session is
1250                  * too long
1251                  */
1252                 if (slen > 0xFF00)
1253                         return -1;
1254                 /* Grow buffer if need be: the length calculation is as
1255                  * follows 12 (DTLS handshake message header) +
1256                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1257                  * 16 (key name) + max_iv_len (iv length) +
1258                  * session_length + max_enc_block_size (max encrypted session
1259                  * length) + max_md_size (HMAC).
1260                  */
1261                 if (!BUF_MEM_grow(s->init_buf,
1262                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1263                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1264                         return -1;
1265                 senc = OPENSSL_malloc(slen);
1266                 if (!senc)
1267                         return -1;
1268                 p = senc;
1269                 i2d_SSL_SESSION(s->session, &p);
1270
1271                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1272                 EVP_CIPHER_CTX_init(&ctx);
1273                 HMAC_CTX_init(&hctx);
1274                 /* Initialize HMAC and cipher contexts. If callback present
1275                  * it does all the work otherwise use generated values
1276                  * from parent ctx.
1277                  */
1278                 if (tctx->tlsext_ticket_key_cb)
1279                         {
1280                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1281                                                          &hctx, 1) < 0)
1282                                 {
1283                                 OPENSSL_free(senc);
1284                                 return -1;
1285                                 }
1286                         }
1287                 else
1288                         {
1289                         RAND_pseudo_bytes(iv, 16);
1290                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1291                                         tctx->tlsext_tick_aes_key, iv);
1292                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1293                                         tlsext_tick_md(), NULL);
1294                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1295                         }
1296                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1297                 /* Skip ticket length for now */
1298                 p += 2;
1299                 /* Output key name */
1300                 macstart = p;
1301                 memcpy(p, key_name, 16);
1302                 p += 16;
1303                 /* output IV */
1304                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1305                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1306                 /* Encrypt session data */
1307                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1308                 p += len;
1309                 EVP_EncryptFinal(&ctx, p, &len);
1310                 p += len;
1311                 EVP_CIPHER_CTX_cleanup(&ctx);
1312
1313                 HMAC_Update(&hctx, macstart, p - macstart);
1314                 HMAC_Final(&hctx, p, &hlen);
1315                 HMAC_CTX_cleanup(&hctx);
1316
1317                 p += hlen;
1318                 /* Now write out lengths: p points to end of data written */
1319                 /* Total length */
1320                 len = p - (unsigned char *)(s->init_buf->data);
1321                 /* Ticket length */
1322                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1323                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1324
1325                 /* number of bytes to write */
1326                 s->init_num= len;
1327                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1328                 s->init_off=0;
1329                 OPENSSL_free(senc);
1330
1331                 /* XDTLS:  set message header ? */
1332                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1333                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1334                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1335
1336                 /* buffer the message to handle re-xmits */
1337                 dtls1_buffer_message(s, 0);
1338                 }
1339
1340         /* SSL3_ST_SW_SESSION_TICKET_B */
1341         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1342         }
1343 #endif