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