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=time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         long num1;
 150         int ret= -1;
 151         int new_state,state,skip=0;
 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         /* init things to blank */
 163         s->in_handshake++;
 164         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 165
 166         if (s->cert == NULL)
 167                 {
 168                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 169                 return(-1);
 170                 }
 171
 172         for (;;)
 173                 {
 174                 state=s->state;
 175
 176                 switch (s->state)
 177                         {
 178                 case SSL_ST_RENEGOTIATE:
 179                         s->new_session=1;
 180                         /* s->state=SSL_ST_ACCEPT; */
 181
 182                 case SSL_ST_BEFORE:
 183                 case SSL_ST_ACCEPT:
 184                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 185                 case SSL_ST_OK|SSL_ST_ACCEPT:
 186
 187                         s->server=1;
 188                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 189
 190                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 191                                 {
 192                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 193                                 return -1;
 194                                 }
 195                         s->type=SSL_ST_ACCEPT;
 196
 197                         if (s->init_buf == NULL)
 198                                 {
 199                                 if ((buf=BUF_MEM_new()) == NULL)
 200                                         {
 201                                         ret= -1;
 202                                         goto end;
 203                                         }
 204                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 205                                         {
 206                                         ret= -1;
 207                                         goto end;
 208                                         }
 209                                 s->init_buf=buf;
 210                                 }
 211
 212                         if (!ssl3_setup_buffers(s))
 213                                 {
 214                                 ret= -1;
 215                                 goto end;
 216                                 }
 217
 218                         s->init_num=0;
 219
 220                         if (s->state != SSL_ST_RENEGOTIATE)
 221                                 {
 222                                 /* Ok, we now need to push on a buffering BIO so that
 223                                  * the output is sent in a way that TCP likes :-)
 224                                  */
 225                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 226
 227                                 ssl3_init_finished_mac(s);
 228                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 229                                 s->ctx->stats.sess_accept++;
 230                                 }
 231                         else
 232                                 {
 233                                 /* s->state == SSL_ST_RENEGOTIATE,
 234                                  * we will just send a HelloRequest */
 235                                 s->ctx->stats.sess_accept_renegotiate++;
 236                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 237                                 }
 238
 239             if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 240                 s->d1->send_cookie = 1;
 241             else
 242                 s->d1->send_cookie = 0;
 243
 244                         break;
 245
 246                 case SSL3_ST_SW_HELLO_REQ_A:
 247                 case SSL3_ST_SW_HELLO_REQ_B:
 248
 249                         s->shutdown=0;
 250                         ret=dtls1_send_hello_request(s);
 251                         if (ret <= 0) goto end;
 252                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 253                         s->state=SSL3_ST_SW_FLUSH;
 254                         s->init_num=0;
 255
 256                         ssl3_init_finished_mac(s);
 257                         break;
 258
 259                 case SSL3_ST_SW_HELLO_REQ_C:
 260                         s->state=SSL_ST_OK;
 261                         break;
 262
 263                 case SSL3_ST_SR_CLNT_HELLO_A:
 264                 case SSL3_ST_SR_CLNT_HELLO_B:
 265                 case SSL3_ST_SR_CLNT_HELLO_C:
 266
 267                         s->shutdown=0;
 268                         ret=ssl3_get_client_hello(s);
 269                         if (ret <= 0) goto end;
 270                         s->new_session = 2;
 271
 272                         if ( s->d1->send_cookie)
 273                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 274                         else
 275                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 276
 277                         s->init_num=0;
 278                         break;
 279
 280                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 281                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 282
 283                         ret = dtls1_send_hello_verify_request(s);
 284                         if ( ret <= 0) goto end;
 285                         s->d1->send_cookie = 0;
 286                         s->state=SSL3_ST_SW_FLUSH;
 287                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 288                         break;
 289
 290                 case SSL3_ST_SW_SRVR_HELLO_A:
 291                 case SSL3_ST_SW_SRVR_HELLO_B:
 292                         ret=dtls1_send_server_hello(s);
 293                         if (ret <= 0) goto end;
 294
 295                         if (s->hit)
 296                                 s->state=SSL3_ST_SW_CHANGE_A;
 297                         else
 298                                 s->state=SSL3_ST_SW_CERT_A;
 299                         s->init_num=0;
 300                         break;
 301
 302                 case SSL3_ST_SW_CERT_A:
 303                 case SSL3_ST_SW_CERT_B:
 304                         /* Check if it is anon DH */
 305                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 306                                 {
 307                                 ret=dtls1_send_server_certificate(s);
 308                                 if (ret <= 0) goto end;
 309                                 }
 310                         else
 311                                 skip=1;
 312                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 313                         s->init_num=0;
 314                         break;
 315
 316                 case SSL3_ST_SW_KEY_EXCH_A:
 317                 case SSL3_ST_SW_KEY_EXCH_B:
 318                         l=s->s3->tmp.new_cipher->algorithms;
 319
 320                         /* clear this, it may get reset by
 321                          * send_server_key_exchange */
 322                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 323 #ifndef OPENSSL_NO_KRB5
 324                                 && !(l & SSL_KRB5)
 325 #endif /* OPENSSL_NO_KRB5 */
 326                                 )
 327                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 328                                  * even when forbidden by protocol specs
 329                                  * (handshake may fail as clients are not required to
 330                                  * be able to handle this) */
 331                                 s->s3->tmp.use_rsa_tmp=1;
 332                         else
 333                                 s->s3->tmp.use_rsa_tmp=0;
 334
 335                         /* only send if a DH key exchange, fortezza or
 336                          * RSA but we have a sign only certificate */
 337                         if (s->s3->tmp.use_rsa_tmp
 338                             || (l & (SSL_DH|SSL_kFZA))
 339                             || ((l & SSL_kRSA)
 340                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 341                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 342                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 343                                         )
 344                                     )
 345                                 )
 346                             )
 347                                 {
 348                                 ret=dtls1_send_server_key_exchange(s);
 349                                 if (ret <= 0) goto end;
 350                                 }
 351                         else
 352                                 skip=1;
 353
 354                         s->state=SSL3_ST_SW_CERT_REQ_A;
 355                         s->init_num=0;
 356                         break;
 357
 358                 case SSL3_ST_SW_CERT_REQ_A:
 359                 case SSL3_ST_SW_CERT_REQ_B:
 360                         if (/* don't request cert unless asked for it: */
 361                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 362                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 363                                  * don't request cert during re-negotiation: */
 364                                 ((s->session->peer != NULL) &&
 365                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 366                                 /* never request cert in anonymous ciphersuites
 367                                  * (see section "Certificate request" in SSL 3 drafts
 368                                  * and in RFC 2246): */
 369                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 370                                  /* ... except when the application insists on verification
 371                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 372                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 373                                  /* never request cert in Kerberos ciphersuites */
 374                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 375                                 {
 376                                 /* no cert request */
 377                                 skip=1;
 378                                 s->s3->tmp.cert_request=0;
 379                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 380                                 }
 381                         else
 382                                 {
 383                                 s->s3->tmp.cert_request=1;
 384                                 ret=dtls1_send_certificate_request(s);
 385                                 if (ret <= 0) goto end;
 386 #ifndef NETSCAPE_HANG_BUG
 387                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 388 #else
 389                                 s->state=SSL3_ST_SW_FLUSH;
 390                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 391 #endif
 392                                 s->init_num=0;
 393                                 }
 394                         break;
 395
 396                 case SSL3_ST_SW_SRVR_DONE_A:
 397                 case SSL3_ST_SW_SRVR_DONE_B:
 398                         ret=dtls1_send_server_done(s);
 399                         if (ret <= 0) goto end;
 400                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 401                         s->state=SSL3_ST_SW_FLUSH;
 402                         s->init_num=0;
 403                         break;
 404
 405                 case SSL3_ST_SW_FLUSH:
 406                         /* number of bytes to be flushed */
 407                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 408                         if (num1 > 0)
 409                                 {
 410                                 s->rwstate=SSL_WRITING;
 411                                 num1=BIO_flush(s->wbio);
 412                                 if (num1 <= 0) { ret= -1; goto end; }
 413                                 s->rwstate=SSL_NOTHING;
 414                                 }
 415
 416                         s->state=s->s3->tmp.next_state;
 417                         break;
 418
 419                 case SSL3_ST_SR_CERT_A:
 420                 case SSL3_ST_SR_CERT_B:
 421                         /* Check for second client hello (MS SGC) */
 422                         ret = ssl3_check_client_hello(s);
 423                         if (ret <= 0)
 424                                 goto end;
 425                         if (ret == 2)
 426                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 427                         else {
 428                                 /* could be sent for a DH cert, even if we
 429                                  * have not asked for it :-) */
 430                                 ret=ssl3_get_client_certificate(s);
 431                                 if (ret <= 0) goto end;
 432                                 s->init_num=0;
 433                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 434                         }
 435                         break;
 436
 437                 case SSL3_ST_SR_KEY_EXCH_A:
 438                 case SSL3_ST_SR_KEY_EXCH_B:
 439                         ret=ssl3_get_client_key_exchange(s);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 442                         s->init_num=0;
 443
 444                         /* We need to get hashes here so if there is
 445                          * a client cert, it can be verified */
 446                         s->method->ssl3_enc->cert_verify_mac(s,
 447                                 &(s->s3->finish_dgst1),
 448                                 &(s->s3->tmp.cert_verify_md[0]));
 449                         s->method->ssl3_enc->cert_verify_mac(s,
 450                                 &(s->s3->finish_dgst2),
 451                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 452
 453                         break;
 454
 455                 case SSL3_ST_SR_CERT_VRFY_A:
 456                 case SSL3_ST_SR_CERT_VRFY_B:
 457
 458                         /* we should decide if we expected this one */
 459                         ret=ssl3_get_cert_verify(s);
 460                         if (ret <= 0) goto end;
 461
 462                         s->state=SSL3_ST_SR_FINISHED_A;
 463                         s->init_num=0;
 464                         break;
 465
 466                 case SSL3_ST_SR_FINISHED_A:
 467                 case SSL3_ST_SR_FINISHED_B:
 468                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 469                                 SSL3_ST_SR_FINISHED_B);
 470                         if (ret <= 0) goto end;
 471                         if (s->hit)
 472                                 s->state=SSL_ST_OK;
 473                         else
 474                                 s->state=SSL3_ST_SW_CHANGE_A;
 475                         s->init_num=0;
 476                         break;
 477
 478                 case SSL3_ST_SW_CHANGE_A:
 479                 case SSL3_ST_SW_CHANGE_B:
 480
 481                         s->session->cipher=s->s3->tmp.new_cipher;
 482                         if (!s->method->ssl3_enc->setup_key_block(s))
 483                                 { ret= -1; goto end; }
 484
 485                         ret=dtls1_send_change_cipher_spec(s,
 486                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 487
 488                         if (ret <= 0) goto end;
 489                         s->state=SSL3_ST_SW_FINISHED_A;
 490                         s->init_num=0;
 491
 492                         if (!s->method->ssl3_enc->change_cipher_state(s,
 493                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 494                                 {
 495                                 ret= -1;
 496                                 goto end;
 497                                 }
 498
 499                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 500                         break;
 501
 502                 case SSL3_ST_SW_FINISHED_A:
 503                 case SSL3_ST_SW_FINISHED_B:
 504                         ret=dtls1_send_finished(s,
 505                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 506                                 s->method->ssl3_enc->server_finished_label,
 507                                 s->method->ssl3_enc->server_finished_label_len);
 508                         if (ret <= 0) goto end;
 509                         s->state=SSL3_ST_SW_FLUSH;
 510                         if (s->hit)
 511                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 512                         else
 513                                 s->s3->tmp.next_state=SSL_ST_OK;
 514                         s->init_num=0;
 515                         break;
 516
 517                 case SSL_ST_OK:
 518                         /* clean a few things up */
 519                         ssl3_cleanup_key_block(s);
 520
 521 #if 0
 522                         BUF_MEM_free(s->init_buf);
 523                         s->init_buf=NULL;
 524 #endif
 525
 526                         /* remove buffering on output */
 527                         ssl_free_wbio_buffer(s);
 528
 529                         s->init_num=0;
 530
 531                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 532                                 {
 533                                 /* actually not necessarily a 'new' session unless
 534                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 535
 536                                 s->new_session=0;
 537
 538                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 539
 540                                 s->ctx->stats.sess_accept_good++;
 541                                 /* s->server=1; */
 542                                 s->handshake_func=dtls1_accept;
 543
 544                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 545                                 }
 546
 547                         ret = 1;
 548
 549                         /* done handshaking, next message is client hello */
 550                         s->d1->handshake_read_seq = 0;
 551                         /* next message is server hello */
 552                         s->d1->handshake_write_seq = 0;
 553                         goto end;
 554                         /* break; */
 555
 556                 default:
 557                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 558                         ret= -1;
 559                         goto end;
 560                         /* break; */
 561                         }
 562
 563                 if (!s->s3->tmp.reuse_message && !skip)
 564                         {
 565                         if (s->debug)
 566                                 {
 567                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 568                                         goto end;
 569                                 }
 570
 571
 572                         if ((cb != NULL) && (s->state != state))
 573                                 {
 574                                 new_state=s->state;
 575                                 s->state=state;
 576                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 577                                 s->state=new_state;
 578                                 }
 579                         }
 580                 skip=0;
 581                 }
 582 end:
 583         /* BIO_flush(s->wbio); */
 584
 585         s->in_handshake--;
 586         if (cb != NULL)
 587                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 588         return(ret);
 589         }
 590
 591 int dtls1_send_hello_request(SSL *s)
 592         {
 593         unsigned char *p;
 594
 595         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 596                 {
 597                 p=(unsigned char *)s->init_buf->data;
 598                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 599
 600                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 601                 /* number of bytes to write */
 602                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 603                 s->init_off=0;
 604
 605                 /* no need to buffer this message, since there are no retransmit
 606                  * requests for it */
 607                 }
 608
 609         /* SSL3_ST_SW_HELLO_REQ_B */
 610         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 611         }
 612
 613 int dtls1_send_hello_verify_request(SSL *s)
 614         {
 615         unsigned int msg_len;
 616         unsigned char *msg, *buf, *p;
 617
 618         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 619                 {
 620                 buf = (unsigned char *)s->init_buf->data;
 621
 622                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 623                 *(p++) = s->version >> 8;
 624                 *(p++) = s->version & 0xFF;
 625
 626                 *(p++) = (unsigned char) s->d1->cookie_len;
 627         if ( s->ctx->app_gen_cookie_cb != NULL &&
 628             s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 629                 &(s->d1->cookie_len)) == 0)
 630             {
 631                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 632             return 0;
 633             }
 634         /* else the cookie is assumed to have
 635          * been initialized by the application */
 636
 637                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 638                 p += s->d1->cookie_len;
 639                 msg_len = p - msg;
 640
 641                 dtls1_set_message_header(s, buf,
 642                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 643
 644                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 645                 /* number of bytes to write */
 646                 s->init_num=p-buf;
 647                 s->init_off=0;
 648
 649                 /* buffer the message to handle re-xmits */
 650                 dtls1_buffer_message(s, 0);
 651                 }
 652
 653         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 654         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 655         }
 656
 657 int dtls1_send_server_hello(SSL *s)
 658         {
 659         unsigned char *buf;
 660         unsigned char *p,*d;
 661         int i;
 662         unsigned int sl;
 663         unsigned long l,Time;
 664
 665         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 666                 {
 667                 buf=(unsigned char *)s->init_buf->data;
 668                 p=s->s3->server_random;
 669                 Time=time(NULL);                        /* Time */
 670                 l2n(Time,p);
 671                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 672                 /* Do the message type and length last */
 673                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 674
 675                 *(p++)=s->version>>8;
 676                 *(p++)=s->version&0xff;
 677
 678                 /* Random stuff */
 679                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 680                 p+=SSL3_RANDOM_SIZE;
 681
 682                 /* now in theory we have 3 options to sending back the
 683                  * session id.  If it is a re-use, we send back the
 684                  * old session-id, if it is a new session, we send
 685                  * back the new session-id or we send back a 0 length
 686                  * session-id if we want it to be single use.
 687                  * Currently I will not implement the '0' length session-id
 688                  * 12-Jan-98 - I'll now support the '0' length stuff.
 689                  */
 690                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 691                         s->session->session_id_length=0;
 692
 693                 sl=s->session->session_id_length;
 694                 if (sl > sizeof s->session->session_id)
 695                         {
 696                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 697                         return -1;
 698                         }
 699                 *(p++)=sl;
 700                 memcpy(p,s->session->session_id,sl);
 701                 p+=sl;
 702
 703                 /* put the cipher */
 704                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 705                 p+=i;
 706
 707                 /* put the compression method */
 708                 if (s->s3->tmp.new_compression == NULL)
 709                         *(p++)=0;
 710                 else
 711                         *(p++)=s->s3->tmp.new_compression->id;
 712
 713                 /* do the header */
 714                 l=(p-d);
 715                 d=buf;
 716
 717                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 718
 719                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 720                 /* number of bytes to write */
 721                 s->init_num=p-buf;
 722                 s->init_off=0;
 723
 724                 /* buffer the message to handle re-xmits */
 725                 dtls1_buffer_message(s, 0);
 726                 }
 727
 728         /* SSL3_ST_CW_CLNT_HELLO_B */
 729         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 730         }
 731
 732 int dtls1_send_server_done(SSL *s)
 733         {
 734         unsigned char *p;
 735
 736         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 737                 {
 738                 p=(unsigned char *)s->init_buf->data;
 739
 740                 /* do the header */
 741                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 742
 743                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 744                 /* number of bytes to write */
 745                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 746                 s->init_off=0;
 747
 748                 /* buffer the message to handle re-xmits */
 749                 dtls1_buffer_message(s, 0);
 750                 }
 751
 752         /* SSL3_ST_CW_CLNT_HELLO_B */
 753         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 754         }
 755
 756 int dtls1_send_server_key_exchange(SSL *s)
 757         {
 758 #ifndef OPENSSL_NO_RSA
 759         unsigned char *q;
 760         int j,num;
 761         RSA *rsa;
 762         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 763         unsigned int u;
 764 #endif
 765 #ifndef OPENSSL_NO_DH
 766         DH *dh=NULL,*dhp;
 767 #endif
 768         EVP_PKEY *pkey;
 769         unsigned char *p,*d;
 770         int al,i;
 771         unsigned long type;
 772         int n;
 773         CERT *cert;
 774         BIGNUM *r[4];
 775         int nr[4],kn;
 776         BUF_MEM *buf;
 777         EVP_MD_CTX md_ctx;
 778
 779         EVP_MD_CTX_init(&md_ctx);
 780         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 781                 {
 782                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 783                 cert=s->cert;
 784
 785                 buf=s->init_buf;
 786
 787                 r[0]=r[1]=r[2]=r[3]=NULL;
 788                 n=0;
 789 #ifndef OPENSSL_NO_RSA
 790                 if (type & SSL_kRSA)
 791                         {
 792                         rsa=cert->rsa_tmp;
 793                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 794                                 {
 795                                 rsa=s->cert->rsa_tmp_cb(s,
 796                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 797                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 798                                 if(rsa == NULL)
 799                                 {
 800                                         al=SSL_AD_HANDSHAKE_FAILURE;
 801                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 802                                         goto f_err;
 803                                 }
 804                                 RSA_up_ref(rsa);
 805                                 cert->rsa_tmp=rsa;
 806                                 }
 807                         if (rsa == NULL)
 808                                 {
 809                                 al=SSL_AD_HANDSHAKE_FAILURE;
 810                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 811                                 goto f_err;
 812                                 }
 813                         r[0]=rsa->n;
 814                         r[1]=rsa->e;
 815                         s->s3->tmp.use_rsa_tmp=1;
 816                         }
 817                 else
 818 #endif
 819 #ifndef OPENSSL_NO_DH
 820                         if (type & SSL_kEDH)
 821                         {
 822                         dhp=cert->dh_tmp;
 823                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 824                                 dhp=s->cert->dh_tmp_cb(s,
 825                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 826                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 827                         if (dhp == NULL)
 828                                 {
 829                                 al=SSL_AD_HANDSHAKE_FAILURE;
 830                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 831                                 goto f_err;
 832                                 }
 833
 834                         if (s->s3->tmp.dh != NULL)
 835                                 {
 836                                 DH_free(dh);
 837                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 838                                 goto err;
 839                                 }
 840
 841                         if ((dh=DHparams_dup(dhp)) == NULL)
 842                                 {
 843                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 844                                 goto err;
 845                                 }
 846
 847                         s->s3->tmp.dh=dh;
 848                         if ((dhp->pub_key == NULL ||
 849                              dhp->priv_key == NULL ||
 850                              (s->options & SSL_OP_SINGLE_DH_USE)))
 851                                 {
 852                                 if(!DH_generate_key(dh))
 853                                     {
 854                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 855                                            ERR_R_DH_LIB);
 856                                     goto err;
 857                                     }
 858                                 }
 859                         else
 860                                 {
 861                                 dh->pub_key=BN_dup(dhp->pub_key);
 862                                 dh->priv_key=BN_dup(dhp->priv_key);
 863                                 if ((dh->pub_key == NULL) ||
 864                                         (dh->priv_key == NULL))
 865                                         {
 866                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 867                                         goto err;
 868                                         }
 869                                 }
 870                         r[0]=dh->p;
 871                         r[1]=dh->g;
 872                         r[2]=dh->pub_key;
 873                         }
 874                 else
 875 #endif
 876                         {
 877                         al=SSL_AD_HANDSHAKE_FAILURE;
 878                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 879                         goto f_err;
 880                         }
 881                 for (i=0; r[i] != NULL; i++)
 882                         {
 883                         nr[i]=BN_num_bytes(r[i]);
 884                         n+=2+nr[i];
 885                         }
 886
 887                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 888                         {
 889                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 890                                 == NULL)
 891                                 {
 892                                 al=SSL_AD_DECODE_ERROR;
 893                                 goto f_err;
 894                                 }
 895                         kn=EVP_PKEY_size(pkey);
 896                         }
 897                 else
 898                         {
 899                         pkey=NULL;
 900                         kn=0;
 901                         }
 902
 903                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 904                         {
 905                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 906                         goto err;
 907                         }
 908                 d=(unsigned char *)s->init_buf->data;
 909                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
 910
 911                 for (i=0; r[i] != NULL; i++)
 912                         {
 913                         s2n(nr[i],p);
 914                         BN_bn2bin(r[i],p);
 915                         p+=nr[i];
 916                         }
 917
 918                 /* not anonymous */
 919                 if (pkey != NULL)
 920                         {
 921                         /* n is the length of the params, they start at
 922                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
 923                          * at the end. */
 924 #ifndef OPENSSL_NO_RSA
 925                         if (pkey->type == EVP_PKEY_RSA)
 926                                 {
 927                                 q=md_buf;
 928                                 j=0;
 929                                 for (num=2; num > 0; num--)
 930                                         {
 931                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
 932                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
 933                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 934                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 935                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 936                                         EVP_DigestFinal_ex(&md_ctx,q,
 937                                                 (unsigned int *)&i);
 938                                         q+=i;
 939                                         j+=i;
 940                                         }
 941                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
 942                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
 943                                         {
 944                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
 945                                         goto err;
 946                                         }
 947                                 s2n(u,p);
 948                                 n+=u+2;
 949                                 }
 950                         else
 951 #endif
 952 #if !defined(OPENSSL_NO_DSA)
 953                                 if (pkey->type == EVP_PKEY_DSA)
 954                                 {
 955                                 /* lets do DSS */
 956                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
 957                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
 958                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
 959                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
 960                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
 961                                         (unsigned int *)&i,pkey))
 962                                         {
 963                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
 964                                         goto err;
 965                                         }
 966                                 s2n(i,p);
 967                                 n+=i+2;
 968                                 }
 969                         else
 970 #endif
 971                                 {
 972                                 /* Is this error check actually needed? */
 973                                 al=SSL_AD_HANDSHAKE_FAILURE;
 974                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
 975                                 goto f_err;
 976                                 }
 977                         }
 978
 979                 d = dtls1_set_message_header(s, d,
 980                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
 981
 982                 /* we should now have things packed up, so lets send
 983                  * it off */
 984                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
 985                 s->init_off=0;
 986
 987                 /* buffer the message to handle re-xmits */
 988                 dtls1_buffer_message(s, 0);
 989                 }
 990
 991         s->state = SSL3_ST_SW_KEY_EXCH_B;
 992         EVP_MD_CTX_cleanup(&md_ctx);
 993         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 994 f_err:
 995         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 996 err:
 997         EVP_MD_CTX_cleanup(&md_ctx);
 998         return(-1);
 999         }
1000
1001 int dtls1_send_certificate_request(SSL *s)
1002         {
1003         unsigned char *p,*d;
1004         int i,j,nl,off,n;
1005         STACK_OF(X509_NAME) *sk=NULL;
1006         X509_NAME *name;
1007         BUF_MEM *buf;
1008
1009         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1010                 {
1011                 buf=s->init_buf;
1012
1013                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1014
1015                 /* get the list of acceptable cert types */
1016                 p++;
1017                 n=ssl3_get_req_cert_type(s,p);
1018                 d[0]=n;
1019                 p+=n;
1020                 n++;
1021
1022                 off=n;
1023                 p+=2;
1024                 n+=2;
1025
1026                 sk=SSL_get_client_CA_list(s);
1027                 nl=0;
1028                 if (sk != NULL)
1029                         {
1030                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1031                                 {
1032                                 name=sk_X509_NAME_value(sk,i);
1033                                 j=i2d_X509_NAME(name,NULL);
1034                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1035                                         {
1036                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1037                                         goto err;
1038                                         }
1039                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1040                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1041                                         {
1042                                         s2n(j,p);
1043                                         i2d_X509_NAME(name,&p);
1044                                         n+=2+j;
1045                                         nl+=2+j;
1046                                         }
1047                                 else
1048                                         {
1049                                         d=p;
1050                                         i2d_X509_NAME(name,&p);
1051                                         j-=2; s2n(j,d); j+=2;
1052                                         n+=j;
1053                                         nl+=j;
1054                                         }
1055                                 }
1056                         }
1057                 /* else no CA names */
1058                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1059                 s2n(nl,p);
1060
1061                 d=(unsigned char *)buf->data;
1062                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1063                 l2n3(n,d);
1064                 s2n(s->d1->handshake_write_seq,d);
1065                 s->d1->handshake_write_seq++;
1066
1067                 /* we should now have things packed up, so lets send
1068                  * it off */
1069
1070                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1071                 s->init_off=0;
1072 #ifdef NETSCAPE_HANG_BUG
1073 /* XXX: what to do about this? */
1074                 p=(unsigned char *)s->init_buf->data + s->init_num;
1075
1076                 /* do the header */
1077                 *(p++)=SSL3_MT_SERVER_DONE;
1078                 *(p++)=0;
1079                 *(p++)=0;
1080                 *(p++)=0;
1081                 s->init_num += 4;
1082 #endif
1083
1084                 /* XDTLS:  set message header ? */
1085                 /* buffer the message to handle re-xmits */
1086                 dtls1_buffer_message(s, 0);
1087
1088                 s->state = SSL3_ST_SW_CERT_REQ_B;
1089                 }
1090
1091         /* SSL3_ST_SW_CERT_REQ_B */
1092         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1093 err:
1094         return(-1);
1095         }
1096
1097 int dtls1_send_server_certificate(SSL *s)
1098         {
1099         unsigned long l;
1100         X509 *x;
1101
1102         if (s->state == SSL3_ST_SW_CERT_A)
1103                 {
1104                 x=ssl_get_server_send_cert(s);
1105                 if (x == NULL &&
1106                         /* VRS: allow null cert if auth == KRB5 */
1107                         (s->s3->tmp.new_cipher->algorithms
1108                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1109                         != (SSL_aKRB5|SSL_kKRB5))
1110                         {
1111                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1112                         return(0);
1113                         }
1114
1115                 l=dtls1_output_cert_chain(s,x);
1116                 s->state=SSL3_ST_SW_CERT_B;
1117                 s->init_num=(int)l;
1118                 s->init_off=0;
1119
1120                 /* buffer the message to handle re-xmits */
1121                 dtls1_buffer_message(s, 0);
1122                 }
1123
1124         /* SSL3_ST_SW_CERT_B */
1125         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1126         }