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 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long l,Time=time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         long num1;
 151         int ret= -1;
 152         int new_state,state,skip=0;
 153
 154         RAND_add(&Time,sizeof(Time),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         for (;;)
 174                 {
 175                 state=s->state;
 176
 177                 switch (s->state)
 178                         {
 179                 case SSL_ST_RENEGOTIATE:
 180                         s->new_session=1;
 181                         /* s->state=SSL_ST_ACCEPT; */
 182
 183                 case SSL_ST_BEFORE:
 184                 case SSL_ST_ACCEPT:
 185                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 186                 case SSL_ST_OK|SSL_ST_ACCEPT:
 187
 188                         s->server=1;
 189                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 190
 191                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 192                                 {
 193                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 194                                 return -1;
 195                                 }
 196                         s->type=SSL_ST_ACCEPT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 }
 212
 213                         if (!ssl3_setup_buffers(s))
 214                                 {
 215                                 ret= -1;
 216                                 goto end;
 217                                 }
 218
 219                         s->init_num=0;
 220
 221                         if (s->state != SSL_ST_RENEGOTIATE)
 222                                 {
 223                                 /* Ok, we now need to push on a buffering BIO so that
 224                                  * the output is sent in a way that TCP likes :-)
 225                                  */
 226                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 227
 228                                 ssl3_init_finished_mac(s);
 229                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 230                                 s->ctx->stats.sess_accept++;
 231                                 }
 232                         else
 233                                 {
 234                                 /* s->state == SSL_ST_RENEGOTIATE,
 235                                  * we will just send a HelloRequest */
 236                                 s->ctx->stats.sess_accept_renegotiate++;
 237                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 238                                 }
 239
 240             if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 241                 s->d1->send_cookie = 1;
 242             else
 243                 s->d1->send_cookie = 0;
 244
 245                         break;
 246
 247                 case SSL3_ST_SW_HELLO_REQ_A:
 248                 case SSL3_ST_SW_HELLO_REQ_B:
 249
 250                         s->shutdown=0;
 251                         ret=dtls1_send_hello_request(s);
 252                         if (ret <= 0) goto end;
 253                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 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                         s->new_session = 2;
 272
 273                         if ( s->d1->send_cookie)
 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                         break;
 280
 281                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 282                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 283
 284                         ret = dtls1_send_hello_verify_request(s);
 285                         if ( ret <= 0) goto end;
 286                         s->d1->send_cookie = 0;
 287                         s->state=SSL3_ST_SW_FLUSH;
 288                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 289                         break;
 290
 291                 case SSL3_ST_SW_SRVR_HELLO_A:
 292                 case SSL3_ST_SW_SRVR_HELLO_B:
 293                         ret=dtls1_send_server_hello(s);
 294                         if (ret <= 0) goto end;
 295
 296                         if (s->hit)
 297                                 s->state=SSL3_ST_SW_CHANGE_A;
 298                         else
 299                                 s->state=SSL3_ST_SW_CERT_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_SW_CERT_A:
 304                 case SSL3_ST_SW_CERT_B:
 305                         /* Check if it is anon DH */
 306                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 307                                 {
 308                                 ret=dtls1_send_server_certificate(s);
 309                                 if (ret <= 0) goto end;
 310                                 }
 311                         else
 312                                 skip=1;
 313                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_SW_KEY_EXCH_A:
 318                 case SSL3_ST_SW_KEY_EXCH_B:
 319                         l=s->s3->tmp.new_cipher->algorithms;
 320
 321                         /* clear this, it may get reset by
 322                          * send_server_key_exchange */
 323                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 324 #ifndef OPENSSL_NO_KRB5
 325                                 && !(l & SSL_KRB5)
 326 #endif /* OPENSSL_NO_KRB5 */
 327                                 )
 328                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 329                                  * even when forbidden by protocol specs
 330                                  * (handshake may fail as clients are not required to
 331                                  * be able to handle this) */
 332                                 s->s3->tmp.use_rsa_tmp=1;
 333                         else
 334                                 s->s3->tmp.use_rsa_tmp=0;
 335
 336                         /* only send if a DH key exchange, fortezza or
 337                          * RSA but we have a sign only certificate */
 338                         if (s->s3->tmp.use_rsa_tmp
 339                             || (l & (SSL_DH|SSL_kFZA))
 340                             || ((l & SSL_kRSA)
 341                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 342                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 343                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 344                                         )
 345                                     )
 346                                 )
 347                             )
 348                                 {
 349                                 ret=dtls1_send_server_key_exchange(s);
 350                                 if (ret <= 0) goto end;
 351                                 }
 352                         else
 353                                 skip=1;
 354
 355                         s->state=SSL3_ST_SW_CERT_REQ_A;
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_SW_CERT_REQ_A:
 360                 case SSL3_ST_SW_CERT_REQ_B:
 361                         if (/* don't request cert unless asked for it: */
 362                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 363                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 364                                  * don't request cert during re-negotiation: */
 365                                 ((s->session->peer != NULL) &&
 366                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 367                                 /* never request cert in anonymous ciphersuites
 368                                  * (see section "Certificate request" in SSL 3 drafts
 369                                  * and in RFC 2246): */
 370                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 371                                  /* ... except when the application insists on verification
 372                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 373                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 374                                  /* never request cert in Kerberos ciphersuites */
 375                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 376                                 {
 377                                 /* no cert request */
 378                                 skip=1;
 379                                 s->s3->tmp.cert_request=0;
 380                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 381                                 }
 382                         else
 383                                 {
 384                                 s->s3->tmp.cert_request=1;
 385                                 ret=dtls1_send_certificate_request(s);
 386                                 if (ret <= 0) goto end;
 387 #ifndef NETSCAPE_HANG_BUG
 388                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 389 #else
 390                                 s->state=SSL3_ST_SW_FLUSH;
 391                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 392 #endif
 393                                 s->init_num=0;
 394                                 }
 395                         break;
 396
 397                 case SSL3_ST_SW_SRVR_DONE_A:
 398                 case SSL3_ST_SW_SRVR_DONE_B:
 399                         ret=dtls1_send_server_done(s);
 400                         if (ret <= 0) goto end;
 401                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 402                         s->state=SSL3_ST_SW_FLUSH;
 403                         s->init_num=0;
 404                         break;
 405
 406                 case SSL3_ST_SW_FLUSH:
 407                         /* number of bytes to be flushed */
 408                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 409                         if (num1 > 0)
 410                                 {
 411                                 s->rwstate=SSL_WRITING;
 412                                 num1=BIO_flush(s->wbio);
 413                                 if (num1 <= 0) { ret= -1; goto end; }
 414                                 s->rwstate=SSL_NOTHING;
 415                                 }
 416
 417                         s->state=s->s3->tmp.next_state;
 418                         break;
 419
 420                 case SSL3_ST_SR_CERT_A:
 421                 case SSL3_ST_SR_CERT_B:
 422                         /* Check for second client hello (MS SGC) */
 423                         ret = ssl3_check_client_hello(s);
 424                         if (ret <= 0)
 425                                 goto end;
 426                         if (ret == 2)
 427                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 428                         else {
 429                                 /* could be sent for a DH cert, even if we
 430                                  * have not asked for it :-) */
 431                                 ret=ssl3_get_client_certificate(s);
 432                                 if (ret <= 0) goto end;
 433                                 s->init_num=0;
 434                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 435                         }
 436                         break;
 437
 438                 case SSL3_ST_SR_KEY_EXCH_A:
 439                 case SSL3_ST_SR_KEY_EXCH_B:
 440                         ret=ssl3_get_client_key_exchange(s);
 441                         if (ret <= 0) goto end;
 442                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 443                         s->init_num=0;
 444
 445                         /* We need to get hashes here so if there is
 446                          * a client cert, it can be verified */
 447                         s->method->ssl3_enc->cert_verify_mac(s,
 448                                 &(s->s3->finish_dgst1),
 449                                 &(s->s3->tmp.cert_verify_md[0]));
 450                         s->method->ssl3_enc->cert_verify_mac(s,
 451                                 &(s->s3->finish_dgst2),
 452                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 453
 454                         break;
 455
 456                 case SSL3_ST_SR_CERT_VRFY_A:
 457                 case SSL3_ST_SR_CERT_VRFY_B:
 458
 459                         /* we should decide if we expected this one */
 460                         ret=ssl3_get_cert_verify(s);
 461                         if (ret <= 0) goto end;
 462
 463                         s->state=SSL3_ST_SR_FINISHED_A;
 464                         s->init_num=0;
 465                         break;
 466
 467                 case SSL3_ST_SR_FINISHED_A:
 468                 case SSL3_ST_SR_FINISHED_B:
 469                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 470                                 SSL3_ST_SR_FINISHED_B);
 471                         if (ret <= 0) goto end;
 472                         if (s->hit)
 473                                 s->state=SSL_ST_OK;
 474                         else
 475                                 s->state=SSL3_ST_SW_CHANGE_A;
 476                         s->init_num=0;
 477                         break;
 478
 479                 case SSL3_ST_SW_CHANGE_A:
 480                 case SSL3_ST_SW_CHANGE_B:
 481
 482                         s->session->cipher=s->s3->tmp.new_cipher;
 483                         if (!s->method->ssl3_enc->setup_key_block(s))
 484                                 { ret= -1; goto end; }
 485
 486                         ret=dtls1_send_change_cipher_spec(s,
 487                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 488
 489                         if (ret <= 0) goto end;
 490                         s->state=SSL3_ST_SW_FINISHED_A;
 491                         s->init_num=0;
 492
 493                         if (!s->method->ssl3_enc->change_cipher_state(s,
 494                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 495                                 {
 496                                 ret= -1;
 497                                 goto end;
 498                                 }
 499
 500                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 501                         break;
 502
 503                 case SSL3_ST_SW_FINISHED_A:
 504                 case SSL3_ST_SW_FINISHED_B:
 505                         ret=dtls1_send_finished(s,
 506                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 507                                 s->method->ssl3_enc->server_finished_label,
 508                                 s->method->ssl3_enc->server_finished_label_len);
 509                         if (ret <= 0) goto end;
 510                         s->state=SSL3_ST_SW_FLUSH;
 511                         if (s->hit)
 512                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 513                         else
 514                                 s->s3->tmp.next_state=SSL_ST_OK;
 515                         s->init_num=0;
 516                         break;
 517
 518                 case SSL_ST_OK:
 519                         /* clean a few things up */
 520                         ssl3_cleanup_key_block(s);
 521
 522 #if 0
 523                         BUF_MEM_free(s->init_buf);
 524                         s->init_buf=NULL;
 525 #endif
 526
 527                         /* remove buffering on output */
 528                         ssl_free_wbio_buffer(s);
 529
 530                         s->init_num=0;
 531
 532                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 533                                 {
 534                                 /* actually not necessarily a 'new' session unless
 535                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 536
 537                                 s->new_session=0;
 538
 539                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 540
 541                                 s->ctx->stats.sess_accept_good++;
 542                                 /* s->server=1; */
 543                                 s->handshake_func=dtls1_accept;
 544
 545                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 546                                 }
 547
 548                         ret = 1;
 549
 550                         /* done handshaking, next message is client hello */
 551                         s->d1->handshake_read_seq = 0;
 552                         /* next message is server hello */
 553                         s->d1->handshake_write_seq = 0;
 554                         goto end;
 555                         /* break; */
 556
 557                 default:
 558                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 559                         ret= -1;
 560                         goto end;
 561                         /* break; */
 562                         }
 563
 564                 if (!s->s3->tmp.reuse_message && !skip)
 565                         {
 566                         if (s->debug)
 567                                 {
 568                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 569                                         goto end;
 570                                 }
 571
 572
 573                         if ((cb != NULL) && (s->state != state))
 574                                 {
 575                                 new_state=s->state;
 576                                 s->state=state;
 577                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 578                                 s->state=new_state;
 579                                 }
 580                         }
 581                 skip=0;
 582                 }
 583 end:
 584         /* BIO_flush(s->wbio); */
 585
 586         s->in_handshake--;
 587         if (cb != NULL)
 588                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 589         return(ret);
 590         }
 591
 592 int dtls1_send_hello_request(SSL *s)
 593         {
 594         unsigned char *p;
 595
 596         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 597                 {
 598                 p=(unsigned char *)s->init_buf->data;
 599                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 600
 601                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 602                 /* number of bytes to write */
 603                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 604                 s->init_off=0;
 605
 606                 /* no need to buffer this message, since there are no retransmit
 607                  * requests for it */
 608                 }
 609
 610         /* SSL3_ST_SW_HELLO_REQ_B */
 611         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 612         }
 613
 614 int dtls1_send_hello_verify_request(SSL *s)
 615         {
 616         unsigned int msg_len;
 617         unsigned char *msg, *buf, *p;
 618
 619         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 620                 {
 621                 buf = (unsigned char *)s->init_buf->data;
 622
 623                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 624                 *(p++) = s->version >> 8;
 625                 *(p++) = s->version & 0xFF;
 626
 627                 *(p++) = (unsigned char) s->d1->cookie_len;
 628         if ( s->ctx->app_gen_cookie_cb != NULL &&
 629             s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 630                 &(s->d1->cookie_len)) == 0)
 631             {
 632                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 633             return 0;
 634             }
 635         /* else the cookie is assumed to have
 636          * been initialized by the application */
 637
 638                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 639                 p += s->d1->cookie_len;
 640                 msg_len = p - msg;
 641
 642                 dtls1_set_message_header(s, buf,
 643                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 644
 645                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 646                 /* number of bytes to write */
 647                 s->init_num=p-buf;
 648                 s->init_off=0;
 649
 650                 /* buffer the message to handle re-xmits */
 651                 dtls1_buffer_message(s, 0);
 652                 }
 653
 654         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 655         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 656         }
 657
 658 int dtls1_send_server_hello(SSL *s)
 659         {
 660         unsigned char *buf;
 661         unsigned char *p,*d;
 662         int i;
 663         unsigned int sl;
 664         unsigned long l,Time;
 665
 666         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 667                 {
 668                 buf=(unsigned char *)s->init_buf->data;
 669                 p=s->s3->server_random;
 670                 Time=time(NULL);                        /* Time */
 671                 l2n(Time,p);
 672                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 673                 /* Do the message type and length last */
 674                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 675
 676                 *(p++)=s->version>>8;
 677                 *(p++)=s->version&0xff;
 678
 679                 /* Random stuff */
 680                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 681                 p+=SSL3_RANDOM_SIZE;
 682
 683                 /* now in theory we have 3 options to sending back the
 684                  * session id.  If it is a re-use, we send back the
 685                  * old session-id, if it is a new session, we send
 686                  * back the new session-id or we send back a 0 length
 687                  * session-id if we want it to be single use.
 688                  * Currently I will not implement the '0' length session-id
 689                  * 12-Jan-98 - I'll now support the '0' length stuff.
 690                  */
 691                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 692                         s->session->session_id_length=0;
 693
 694                 sl=s->session->session_id_length;
 695                 if (sl > sizeof s->session->session_id)
 696                         {
 697                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 698                         return -1;
 699                         }
 700                 *(p++)=sl;
 701                 memcpy(p,s->session->session_id,sl);
 702                 p+=sl;
 703
 704                 /* put the cipher */
 705                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 706                 p+=i;
 707
 708                 /* put the compression method */
 709 #ifdef OPENSSL_NO_COMP
 710                 *(p++)=0;
 711 #else
 712                 if (s->s3->tmp.new_compression == NULL)
 713                         *(p++)=0;
 714                 else
 715                         *(p++)=s->s3->tmp.new_compression->id;
 716 #endif
 717
 718                 /* do the header */
 719                 l=(p-d);
 720                 d=buf;
 721
 722                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 723
 724                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 725                 /* number of bytes to write */
 726                 s->init_num=p-buf;
 727                 s->init_off=0;
 728
 729                 /* buffer the message to handle re-xmits */
 730                 dtls1_buffer_message(s, 0);
 731                 }
 732
 733         /* SSL3_ST_CW_CLNT_HELLO_B */
 734         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 735         }
 736
 737 int dtls1_send_server_done(SSL *s)
 738         {
 739         unsigned char *p;
 740
 741         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 742                 {
 743                 p=(unsigned char *)s->init_buf->data;
 744
 745                 /* do the header */
 746                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 747
 748                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 749                 /* number of bytes to write */
 750                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 751                 s->init_off=0;
 752
 753                 /* buffer the message to handle re-xmits */
 754                 dtls1_buffer_message(s, 0);
 755                 }
 756
 757         /* SSL3_ST_CW_CLNT_HELLO_B */
 758         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 759         }
 760
 761 int dtls1_send_server_key_exchange(SSL *s)
 762         {
 763 #ifndef OPENSSL_NO_RSA
 764         unsigned char *q;
 765         int j,num;
 766         RSA *rsa;
 767         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 768         unsigned int u;
 769 #endif
 770 #ifndef OPENSSL_NO_DH
 771         DH *dh=NULL,*dhp;
 772 #endif
 773         EVP_PKEY *pkey;
 774         unsigned char *p,*d;
 775         int al,i;
 776         unsigned long type;
 777         int n;
 778         CERT *cert;
 779         BIGNUM *r[4];
 780         int nr[4],kn;
 781         BUF_MEM *buf;
 782         EVP_MD_CTX md_ctx;
 783
 784         EVP_MD_CTX_init(&md_ctx);
 785         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 786                 {
 787                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 788                 cert=s->cert;
 789
 790                 buf=s->init_buf;
 791
 792                 r[0]=r[1]=r[2]=r[3]=NULL;
 793                 n=0;
 794 #ifndef OPENSSL_NO_RSA
 795                 if (type & SSL_kRSA)
 796                         {
 797                         rsa=cert->rsa_tmp;
 798                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 799                                 {
 800                                 rsa=s->cert->rsa_tmp_cb(s,
 801                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 802                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 803                                 if(rsa == NULL)
 804                                 {
 805                                         al=SSL_AD_HANDSHAKE_FAILURE;
 806                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 807                                         goto f_err;
 808                                 }
 809                                 RSA_up_ref(rsa);
 810                                 cert->rsa_tmp=rsa;
 811                                 }
 812                         if (rsa == NULL)
 813                                 {
 814                                 al=SSL_AD_HANDSHAKE_FAILURE;
 815                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 816                                 goto f_err;
 817                                 }
 818                         r[0]=rsa->n;
 819                         r[1]=rsa->e;
 820                         s->s3->tmp.use_rsa_tmp=1;
 821                         }
 822                 else
 823 #endif
 824 #ifndef OPENSSL_NO_DH
 825                         if (type & SSL_kEDH)
 826                         {
 827                         dhp=cert->dh_tmp;
 828                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 829                                 dhp=s->cert->dh_tmp_cb(s,
 830                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 831                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 832                         if (dhp == NULL)
 833                                 {
 834                                 al=SSL_AD_HANDSHAKE_FAILURE;
 835                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 836                                 goto f_err;
 837                                 }
 838
 839                         if (s->s3->tmp.dh != NULL)
 840                                 {
 841                                 DH_free(dh);
 842                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 843                                 goto err;
 844                                 }
 845
 846                         if ((dh=DHparams_dup(dhp)) == NULL)
 847                                 {
 848                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 849                                 goto err;
 850                                 }
 851
 852                         s->s3->tmp.dh=dh;
 853                         if ((dhp->pub_key == NULL ||
 854                              dhp->priv_key == NULL ||
 855                              (s->options & SSL_OP_SINGLE_DH_USE)))
 856                                 {
 857                                 if(!DH_generate_key(dh))
 858                                     {
 859                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 860                                            ERR_R_DH_LIB);
 861                                     goto err;
 862                                     }
 863                                 }
 864                         else
 865                                 {
 866                                 dh->pub_key=BN_dup(dhp->pub_key);
 867                                 dh->priv_key=BN_dup(dhp->priv_key);
 868                                 if ((dh->pub_key == NULL) ||
 869                                         (dh->priv_key == NULL))
 870                                         {
 871                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 872                                         goto err;
 873                                         }
 874                                 }
 875                         r[0]=dh->p;
 876                         r[1]=dh->g;
 877                         r[2]=dh->pub_key;
 878                         }
 879                 else
 880 #endif
 881                         {
 882                         al=SSL_AD_HANDSHAKE_FAILURE;
 883                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 884                         goto f_err;
 885                         }
 886                 for (i=0; r[i] != NULL; i++)
 887                         {
 888                         nr[i]=BN_num_bytes(r[i]);
 889                         n+=2+nr[i];
 890                         }
 891
 892                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 893                         {
 894                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 895                                 == NULL)
 896                                 {
 897                                 al=SSL_AD_DECODE_ERROR;
 898                                 goto f_err;
 899                                 }
 900                         kn=EVP_PKEY_size(pkey);
 901                         }
 902                 else
 903                         {
 904                         pkey=NULL;
 905                         kn=0;
 906                         }
 907
 908                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 909                         {
 910                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 911                         goto err;
 912                         }
 913                 d=(unsigned char *)s->init_buf->data;
 914                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 915
 916                 for (i=0; r[i] != NULL; i++)
 917                         {
 918                         s2n(nr[i],p);
 919                         BN_bn2bin(r[i],p);
 920                         p+=nr[i];
 921                         }
 922
 923                 /* not anonymous */
 924                 if (pkey != NULL)
 925                         {
 926                         /* n is the length of the params, they start at
 927                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 928                          * at the end. */
 929 #ifndef OPENSSL_NO_RSA
 930                         if (pkey->type == EVP_PKEY_RSA)
 931                                 {
 932                                 q=md_buf;
 933                                 j=0;
 934                                 for (num=2; num > 0; num--)
 935                                         {
 936                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 937                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 938                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 939                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 940                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 941                                         EVP_DigestFinal_ex(&md_ctx,q,
 942                                                 (unsigned int *)&i);
 943                                         q+=i;
 944                                         j+=i;
 945                                         }
 946                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 947                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 948                                         {
 949                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 950                                         goto err;
 951                                         }
 952                                 s2n(u,p);
 953                                 n+=u+2;
 954                                 }
 955                         else
 956 #endif
 957 #if !defined(OPENSSL_NO_DSA)
 958                                 if (pkey->type == EVP_PKEY_DSA)
 959                                 {
 960                                 /* lets do DSS */
 961                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 962                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 963                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 964                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 965                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 966                                         (unsigned int *)&i,pkey))
 967                                         {
 968                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 969                                         goto err;
 970                                         }
 971                                 s2n(i,p);
 972                                 n+=i+2;
 973                                 }
 974                         else
 975 #endif
 976                                 {
 977                                 /* Is this error check actually needed? */
 978                                 al=SSL_AD_HANDSHAKE_FAILURE;
 979                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 980                                 goto f_err;
 981                                 }
 982                         }
 983
 984                 d = dtls1_set_message_header(s, d,
 985                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 986
 987                 /* we should now have things packed up, so lets send
 988                  * it off */
 989                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 990                 s->init_off=0;
 991
 992                 /* buffer the message to handle re-xmits */
 993                 dtls1_buffer_message(s, 0);
 994                 }
 995
 996         s->state = SSL3_ST_SW_KEY_EXCH_B;
 997         EVP_MD_CTX_cleanup(&md_ctx);
 998         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 999 f_err:
1000         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1001 err:
1002         EVP_MD_CTX_cleanup(&md_ctx);
1003         return(-1);
1004         }
1005
1006 int dtls1_send_certificate_request(SSL *s)
1007         {
1008         unsigned char *p,*d;
1009         int i,j,nl,off,n;
1010         STACK_OF(X509_NAME) *sk=NULL;
1011         X509_NAME *name;
1012         BUF_MEM *buf;
1013
1014         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1015                 {
1016                 buf=s->init_buf;
1017
1018                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1019
1020                 /* get the list of acceptable cert types */
1021                 p++;
1022                 n=ssl3_get_req_cert_type(s,p);
1023                 d[0]=n;
1024                 p+=n;
1025                 n++;
1026
1027                 off=n;
1028                 p+=2;
1029                 n+=2;
1030
1031                 sk=SSL_get_client_CA_list(s);
1032                 nl=0;
1033                 if (sk != NULL)
1034                         {
1035                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1036                                 {
1037                                 name=sk_X509_NAME_value(sk,i);
1038                                 j=i2d_X509_NAME(name,NULL);
1039                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1040                                         {
1041                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1042                                         goto err;
1043                                         }
1044                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1045                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1046                                         {
1047                                         s2n(j,p);
1048                                         i2d_X509_NAME(name,&p);
1049                                         n+=2+j;
1050                                         nl+=2+j;
1051                                         }
1052                                 else
1053                                         {
1054                                         d=p;
1055                                         i2d_X509_NAME(name,&p);
1056                                         j-=2; s2n(j,d); j+=2;
1057                                         n+=j;
1058                                         nl+=j;
1059                                         }
1060                                 }
1061                         }
1062                 /* else no CA names */
1063                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1064                 s2n(nl,p);
1065
1066                 d=(unsigned char *)buf->data;
1067                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1068                 l2n3(n,d);
1069                 s2n(s->d1->handshake_write_seq,d);
1070                 s->d1->handshake_write_seq++;
1071
1072                 /* we should now have things packed up, so lets send
1073                  * it off */
1074
1075                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1076                 s->init_off=0;
1077 #ifdef NETSCAPE_HANG_BUG
1078 /* XXX: what to do about this? */
1079                 p=(unsigned char *)s->init_buf->data + s->init_num;
1080
1081                 /* do the header */
1082                 *(p++)=SSL3_MT_SERVER_DONE;
1083                 *(p++)=0;
1084                 *(p++)=0;
1085                 *(p++)=0;
1086                 s->init_num += 4;
1087 #endif
1088
1089                 /* XDTLS:  set message header ? */
1090                 /* buffer the message to handle re-xmits */
1091                 dtls1_buffer_message(s, 0);
1092
1093                 s->state = SSL3_ST_SW_CERT_REQ_B;
1094                 }
1095
1096         /* SSL3_ST_SW_CERT_REQ_B */
1097         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1098 err:
1099         return(-1);
1100         }
1101
1102 int dtls1_send_server_certificate(SSL *s)
1103         {
1104         unsigned long l;
1105         X509 *x;
1106
1107         if (s->state == SSL3_ST_SW_CERT_A)
1108                 {
1109                 x=ssl_get_server_send_cert(s);
1110                 if (x == NULL &&
1111                         /* VRS: allow null cert if auth == KRB5 */
1112                         (s->s3->tmp.new_cipher->algorithms
1113                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1114                         != (SSL_aKRB5|SSL_kKRB5))
1115                         {
1116                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1117                         return(0);
1118                         }
1119
1120                 l=dtls1_output_cert_chain(s,x);
1121                 s->state=SSL3_ST_SW_CERT_B;
1122                 s->init_num=(int)l;
1123                 s->init_off=0;
1124
1125                 /* buffer the message to handle re-xmits */
1126                 dtls1_buffer_message(s, 0);
1127                 }
1128
1129         /* SSL3_ST_SW_CERT_B */
1130         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1131         }