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