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