ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #ifndef OPENSSL_NO_DH
 125 #include <openssl/dh.h>
 126 #endif
 127
 128 static SSL_METHOD *dtls1_get_server_method(int ver);
 129 static int dtls1_send_hello_verify_request(SSL *s);
 130
 131 static SSL_METHOD *dtls1_get_server_method(int ver)
 132         {
 133         if (ver == DTLS1_VERSION)
 134                 return(DTLSv1_server_method());
 135         else
 136                 return(NULL);
 137         }
 138
 139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 140                         dtls1_accept,
 141                         ssl_undefined_function,
 142                         dtls1_get_server_method)
 143
 144 int dtls1_accept(SSL *s)
 145         {
 146         BUF_MEM *buf;
 147         unsigned long l,Time=(unsigned long)time(NULL);
 148         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 149         int ret= -1;
 150         int new_state,state,skip=0;
 151         int listen;
 152
 153         RAND_add(&Time,sizeof(Time),0);
 154         ERR_clear_error();
 155         clear_sys_error();
 156
 157         if (s->info_callback != NULL)
 158                 cb=s->info_callback;
 159         else if (s->ctx->info_callback != NULL)
 160                 cb=s->ctx->info_callback;
 161
 162         listen = s->d1->listen;
 163
 164         /* init things to blank */
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         if (s->cert == NULL)
 169                 {
 170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 171                 return(-1);
 172                 }
 173
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_RENEGOTIATE:
 181                         s->new_session=1;
 182                         /* s->state=SSL_ST_ACCEPT; */
 183
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_ACCEPT:
 186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 187                 case SSL_ST_OK|SSL_ST_ACCEPT:
 188
 189                         s->server=1;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 193                                 {
 194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 195                                 return -1;
 196                                 }
 197                         s->type=SSL_ST_ACCEPT;
 198
 199                         if (s->init_buf == NULL)
 200                                 {
 201                                 if ((buf=BUF_MEM_new()) == NULL)
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 207                                         {
 208                                         ret= -1;
 209                                         goto end;
 210                                         }
 211                                 s->init_buf=buf;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s))
 215                                 {
 216                                 ret= -1;
 217                                 goto end;
 218                                 }
 219
 220                         s->init_num=0;
 221
 222                         if (s->state != SSL_ST_RENEGOTIATE)
 223                                 {
 224                                 /* Ok, we now need to push on a buffering BIO so that
 225                                  * the output is sent in a way that TCP likes :-)
 226                                  */
 227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 228
 229                                 ssl3_init_finished_mac(s);
 230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 231                                 s->ctx->stats.sess_accept++;
 232                                 }
 233                         else
 234                                 {
 235                                 /* s->state == SSL_ST_RENEGOTIATE,
 236                                  * we will just send a HelloRequest */
 237                                 s->ctx->stats.sess_accept_renegotiate++;
 238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 239                                 }
 240
 241                         break;
 242
 243                 case SSL3_ST_SW_HELLO_REQ_A:
 244                 case SSL3_ST_SW_HELLO_REQ_B:
 245
 246                         s->shutdown=0;
 247                         dtls1_start_timer(s);
 248                         ret=dtls1_send_hello_request(s);
 249                         if (ret <= 0) goto end;
 250                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 251                         s->state=SSL3_ST_SW_FLUSH;
 252                         s->init_num=0;
 253
 254                         ssl3_init_finished_mac(s);
 255                         break;
 256
 257                 case SSL3_ST_SW_HELLO_REQ_C:
 258                         s->state=SSL_ST_OK;
 259                         break;
 260
 261                 case SSL3_ST_SR_CLNT_HELLO_A:
 262                 case SSL3_ST_SR_CLNT_HELLO_B:
 263                 case SSL3_ST_SR_CLNT_HELLO_C:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_get_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         dtls1_stop_timer(s);
 269
 270                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 271                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 272                         else
 273                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 274
 275                         s->init_num=0;
 276
 277                         /* If we're just listening, stop here */
 278                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 279                                 {
 280                                 ret = 2;
 281                                 s->d1->listen = 0;
 282                                 /* Set expected sequence numbers
 283                                  * to continue the handshake.
 284                                  */
 285                                 s->d1->handshake_read_seq = 2;
 286                                 s->d1->handshake_write_seq = 1;
 287                                 s->d1->next_handshake_write_seq = 1;
 288                                 goto end;
 289                                 }
 290
 291                         break;
 292
 293                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 294                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 295
 296                         ret = dtls1_send_hello_verify_request(s);
 297                         if ( ret <= 0) goto end;
 298                         s->state=SSL3_ST_SW_FLUSH;
 299                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 300
 301                         /* HelloVerifyRequests resets Finished MAC */
 302                         if (s->client_version != DTLS1_BAD_VER)
 303                                 ssl3_init_finished_mac(s);
 304                         break;
 305
 306                 case SSL3_ST_SW_SRVR_HELLO_A:
 307                 case SSL3_ST_SW_SRVR_HELLO_B:
 308                         s->new_session = 2;
 309                         dtls1_start_timer(s);
 310                         ret=dtls1_send_server_hello(s);
 311                         if (ret <= 0) goto end;
 312
 313 #ifndef OPENSSL_NO_TLSEXT
 314                         if (s->hit)
 315                                 {
 316                                 if (s->tlsext_ticket_expected)
 317                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 318                                 else
 319                                         s->state=SSL3_ST_SW_CHANGE_A;
 320                                 }
 321 #else
 322                         if (s->hit)
 323                                         s->state=SSL3_ST_SW_CHANGE_A;
 324 #endif
 325                         else
 326                                 s->state=SSL3_ST_SW_CERT_A;
 327                         s->init_num=0;
 328                         break;
 329
 330                 case SSL3_ST_SW_CERT_A:
 331                 case SSL3_ST_SW_CERT_B:
 332                         /* Check if it is anon DH */
 333                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 334                                 {
 335                                 dtls1_start_timer(s);
 336                                 ret=dtls1_send_server_certificate(s);
 337                                 if (ret <= 0) goto end;
 338 #ifndef OPENSSL_NO_TLSEXT
 339                                 if (s->tlsext_status_expected)
 340                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 341                                 else
 342                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 343                                 }
 344                         else
 345                                 {
 346                                 skip = 1;
 347                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 348                                 }
 349 #else
 350                                 }
 351                         else
 352                                 skip=1;
 353
 354                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 355 #endif
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_SW_KEY_EXCH_A:
 360                 case SSL3_ST_SW_KEY_EXCH_B:
 361                         l=s->s3->tmp.new_cipher->algorithms;
 362
 363                         /* clear this, it may get reset by
 364                          * send_server_key_exchange */
 365                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 366 #ifndef OPENSSL_NO_KRB5
 367                                 && !(l & SSL_KRB5)
 368 #endif /* OPENSSL_NO_KRB5 */
 369                                 )
 370                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 371                                  * even when forbidden by protocol specs
 372                                  * (handshake may fail as clients are not required to
 373                                  * be able to handle this) */
 374                                 s->s3->tmp.use_rsa_tmp=1;
 375                         else
 376                                 s->s3->tmp.use_rsa_tmp=0;
 377
 378                         /* only send if a DH key exchange, fortezza or
 379                          * RSA but we have a sign only certificate */
 380                         if (s->s3->tmp.use_rsa_tmp
 381                             || (l & (SSL_DH|SSL_kFZA))
 382                             || ((l & SSL_kRSA)
 383                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 384                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 385                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 386                                         )
 387                                     )
 388                                 )
 389                             )
 390                                 {
 391                                 dtls1_start_timer(s);
 392                                 ret=dtls1_send_server_key_exchange(s);
 393                                 if (ret <= 0) goto end;
 394                                 }
 395                         else
 396                                 skip=1;
 397
 398                         s->state=SSL3_ST_SW_CERT_REQ_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_SW_CERT_REQ_A:
 403                 case SSL3_ST_SW_CERT_REQ_B:
 404                         if (/* don't request cert unless asked for it: */
 405                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 406                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 407                                  * don't request cert during re-negotiation: */
 408                                 ((s->session->peer != NULL) &&
 409                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 410                                 /* never request cert in anonymous ciphersuites
 411                                  * (see section "Certificate request" in SSL 3 drafts
 412                                  * and in RFC 2246): */
 413                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 414                                  /* ... except when the application insists on verification
 415                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 416                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 417                                  /* never request cert in Kerberos ciphersuites */
 418                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 419                                 {
 420                                 /* no cert request */
 421                                 skip=1;
 422                                 s->s3->tmp.cert_request=0;
 423                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 424                                 }
 425                         else
 426                                 {
 427                                 s->s3->tmp.cert_request=1;
 428                                 dtls1_start_timer(s);
 429                                 ret=dtls1_send_certificate_request(s);
 430                                 if (ret <= 0) goto end;
 431 #ifndef NETSCAPE_HANG_BUG
 432                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 433 #else
 434                                 s->state=SSL3_ST_SW_FLUSH;
 435                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 436 #endif
 437                                 s->init_num=0;
 438                                 }
 439                         break;
 440
 441                 case SSL3_ST_SW_SRVR_DONE_A:
 442                 case SSL3_ST_SW_SRVR_DONE_B:
 443                         dtls1_start_timer(s);
 444                         ret=dtls1_send_server_done(s);
 445                         if (ret <= 0) goto end;
 446                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 447                         s->state=SSL3_ST_SW_FLUSH;
 448                         s->init_num=0;
 449                         break;
 450
 451                 case SSL3_ST_SW_FLUSH:
 452                         s->rwstate=SSL_WRITING;
 453                         if (BIO_flush(s->wbio) <= 0)
 454                                 {
 455                                 ret= -1;
 456                                 goto end;
 457                                 }
 458                         s->rwstate=SSL_NOTHING;
 459                         s->state=s->s3->tmp.next_state;
 460                         break;
 461
 462                 case SSL3_ST_SR_CERT_A:
 463                 case SSL3_ST_SR_CERT_B:
 464                         /* Check for second client hello (MS SGC) */
 465                         ret = ssl3_check_client_hello(s);
 466                         if (ret <= 0)
 467                                 goto end;
 468                         dtls1_stop_timer(s);
 469                         if (ret == 2)
 470                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 471                         else {
 472                                 /* could be sent for a DH cert, even if we
 473                                  * have not asked for it :-) */
 474                                 ret=ssl3_get_client_certificate(s);
 475                                 if (ret <= 0) goto end;
 476                                 dtls1_stop_timer(s);
 477                                 s->init_num=0;
 478                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 479                         }
 480                         break;
 481
 482                 case SSL3_ST_SR_KEY_EXCH_A:
 483                 case SSL3_ST_SR_KEY_EXCH_B:
 484                         ret=ssl3_get_client_key_exchange(s);
 485                         if (ret <= 0) goto end;
 486                         dtls1_stop_timer(s);
 487                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 488                         s->init_num=0;
 489
 490                         /* We need to get hashes here so if there is
 491                          * a client cert, it can be verified */
 492                         s->method->ssl3_enc->cert_verify_mac(s,
 493                                 &(s->s3->finish_dgst1),
 494                                 &(s->s3->tmp.cert_verify_md[0]));
 495                         s->method->ssl3_enc->cert_verify_mac(s,
 496                                 &(s->s3->finish_dgst2),
 497                                 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 498
 499                         break;
 500
 501                 case SSL3_ST_SR_CERT_VRFY_A:
 502                 case SSL3_ST_SR_CERT_VRFY_B:
 503
 504                         s->d1->change_cipher_spec_ok = 1;
 505                         /* we should decide if we expected this one */
 506                         ret=ssl3_get_cert_verify(s);
 507                         if (ret <= 0) goto end;
 508                         dtls1_stop_timer(s);
 509
 510                         s->state=SSL3_ST_SR_FINISHED_A;
 511                         s->init_num=0;
 512                         break;
 513
 514                 case SSL3_ST_SR_FINISHED_A:
 515                 case SSL3_ST_SR_FINISHED_B:
 516                         s->d1->change_cipher_spec_ok = 1;
 517                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 518                                 SSL3_ST_SR_FINISHED_B);
 519                         if (ret <= 0) goto end;
 520                         dtls1_stop_timer(s);
 521                         if (s->hit)
 522                                 s->state=SSL_ST_OK;
 523 #ifndef OPENSSL_NO_TLSEXT
 524                         else if (s->tlsext_ticket_expected)
 525                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 526 #endif
 527                         else
 528                                 s->state=SSL3_ST_SW_CHANGE_A;
 529                         s->init_num=0;
 530                         break;
 531
 532 #ifndef OPENSSL_NO_TLSEXT
 533                 case SSL3_ST_SW_SESSION_TICKET_A:
 534                 case SSL3_ST_SW_SESSION_TICKET_B:
 535                         ret=dtls1_send_newsession_ticket(s);
 536                         if (ret <= 0) goto end;
 537                         s->state=SSL3_ST_SW_CHANGE_A;
 538                         s->init_num=0;
 539                         break;
 540
 541                 case SSL3_ST_SW_CERT_STATUS_A:
 542                 case SSL3_ST_SW_CERT_STATUS_B:
 543                         ret=ssl3_send_cert_status(s);
 544                         if (ret <= 0) goto end;
 545                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 546                         s->init_num=0;
 547                         break;
 548
 549 #endif
 550
 551                 case SSL3_ST_SW_CHANGE_A:
 552                 case SSL3_ST_SW_CHANGE_B:
 553
 554                         s->session->cipher=s->s3->tmp.new_cipher;
 555                         if (!s->method->ssl3_enc->setup_key_block(s))
 556                                 { ret= -1; goto end; }
 557
 558                         ret=dtls1_send_change_cipher_spec(s,
 559                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 560
 561                         if (ret <= 0) goto end;
 562                         s->state=SSL3_ST_SW_FINISHED_A;
 563                         s->init_num=0;
 564
 565                         if (!s->method->ssl3_enc->change_cipher_state(s,
 566                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 567                                 {
 568                                 ret= -1;
 569                                 goto end;
 570                                 }
 571
 572                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 573                         break;
 574
 575                 case SSL3_ST_SW_FINISHED_A:
 576                 case SSL3_ST_SW_FINISHED_B:
 577                         ret=dtls1_send_finished(s,
 578                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 579                                 s->method->ssl3_enc->server_finished_label,
 580                                 s->method->ssl3_enc->server_finished_label_len);
 581                         if (ret <= 0) goto end;
 582                         s->state=SSL3_ST_SW_FLUSH;
 583                         if (s->hit)
 584                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 585                         else
 586                                 s->s3->tmp.next_state=SSL_ST_OK;
 587                         s->init_num=0;
 588                         break;
 589
 590                 case SSL_ST_OK:
 591                         /* clean a few things up */
 592                         ssl3_cleanup_key_block(s);
 593
 594 #if 0
 595                         BUF_MEM_free(s->init_buf);
 596                         s->init_buf=NULL;
 597 #endif
 598
 599                         /* remove buffering on output */
 600                         ssl_free_wbio_buffer(s);
 601
 602                         s->init_num=0;
 603
 604                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 605                                 {
 606                                 /* actually not necessarily a 'new' session unless
 607                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 608
 609                                 s->new_session=0;
 610
 611                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 612
 613                                 s->ctx->stats.sess_accept_good++;
 614                                 /* s->server=1; */
 615                                 s->handshake_func=dtls1_accept;
 616
 617                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 618                                 }
 619
 620                         ret = 1;
 621
 622                         /* done handshaking, next message is client hello */
 623                         s->d1->handshake_read_seq = 0;
 624                         /* next message is server hello */
 625                         s->d1->handshake_write_seq = 0;
 626                         s->d1->next_handshake_write_seq = 0;
 627                         goto end;
 628                         /* break; */
 629
 630                 default:
 631                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 632                         ret= -1;
 633                         goto end;
 634                         /* break; */
 635                         }
 636
 637                 if (!s->s3->tmp.reuse_message && !skip)
 638                         {
 639                         if (s->debug)
 640                                 {
 641                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 642                                         goto end;
 643                                 }
 644
 645
 646                         if ((cb != NULL) && (s->state != state))
 647                                 {
 648                                 new_state=s->state;
 649                                 s->state=state;
 650                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 651                                 s->state=new_state;
 652                                 }
 653                         }
 654                 skip=0;
 655                 }
 656 end:
 657         /* BIO_flush(s->wbio); */
 658
 659         s->in_handshake--;
 660         if (cb != NULL)
 661                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 662         return(ret);
 663         }
 664
 665 int dtls1_send_hello_request(SSL *s)
 666         {
 667         unsigned char *p;
 668
 669         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 670                 {
 671                 p=(unsigned char *)s->init_buf->data;
 672                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 673
 674                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 675                 /* number of bytes to write */
 676                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 677                 s->init_off=0;
 678
 679                 /* no need to buffer this message, since there are no retransmit
 680                  * requests for it */
 681                 }
 682
 683         /* SSL3_ST_SW_HELLO_REQ_B */
 684         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 685         }
 686
 687 int dtls1_send_hello_verify_request(SSL *s)
 688         {
 689         unsigned int msg_len;
 690         unsigned char *msg, *buf, *p;
 691
 692         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 693                 {
 694                 buf = (unsigned char *)s->init_buf->data;
 695
 696                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 697                 if (s->client_version == DTLS1_BAD_VER)
 698                         *(p++) = DTLS1_BAD_VER>>8,
 699                         *(p++) = DTLS1_BAD_VER&0xff;
 700                 else
 701                         *(p++) = s->version >> 8,
 702                         *(p++) = s->version & 0xFF;
 703
 704                 if (s->ctx->app_gen_cookie_cb == NULL ||
 705                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 706                          &(s->d1->cookie_len)) == 0)
 707                         {
 708                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 709                         return 0;
 710                         }
 711
 712                 *(p++) = (unsigned char) s->d1->cookie_len;
 713                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 714                 p += s->d1->cookie_len;
 715                 msg_len = p - msg;
 716
 717                 dtls1_set_message_header(s, buf,
 718                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 719
 720                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 721                 /* number of bytes to write */
 722                 s->init_num=p-buf;
 723                 s->init_off=0;
 724                 }
 725
 726         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 727         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 728         }
 729
 730 int dtls1_send_server_hello(SSL *s)
 731         {
 732         unsigned char *buf;
 733         unsigned char *p,*d;
 734         int i;
 735         unsigned int sl;
 736         unsigned long l,Time;
 737
 738         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 739                 {
 740                 buf=(unsigned char *)s->init_buf->data;
 741                 p=s->s3->server_random;
 742                 Time=(unsigned long)time(NULL);                 /* Time */
 743                 l2n(Time,p);
 744                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 745                 /* Do the message type and length last */
 746                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 747
 748                 if (s->client_version == DTLS1_BAD_VER)
 749                         *(p++)=DTLS1_BAD_VER>>8,
 750                         *(p++)=DTLS1_BAD_VER&0xff;
 751                 else
 752                         *(p++)=s->version>>8,
 753                         *(p++)=s->version&0xff;
 754
 755                 /* Random stuff */
 756                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 757                 p+=SSL3_RANDOM_SIZE;
 758
 759                 /* now in theory we have 3 options to sending back the
 760                  * session id.  If it is a re-use, we send back the
 761                  * old session-id, if it is a new session, we send
 762                  * back the new session-id or we send back a 0 length
 763                  * session-id if we want it to be single use.
 764                  * Currently I will not implement the '0' length session-id
 765                  * 12-Jan-98 - I'll now support the '0' length stuff.
 766                  */
 767                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 768                         s->session->session_id_length=0;
 769
 770                 sl=s->session->session_id_length;
 771                 if (sl > sizeof s->session->session_id)
 772                         {
 773                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 774                         return -1;
 775                         }
 776                 *(p++)=sl;
 777                 memcpy(p,s->session->session_id,sl);
 778                 p+=sl;
 779
 780                 /* put the cipher */
 781                 if (s->s3->tmp.new_cipher == NULL)
 782                         return -1;
 783                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 784                 p+=i;
 785
 786                 /* put the compression method */
 787 #ifdef OPENSSL_NO_COMP
 788                 *(p++)=0;
 789 #else
 790                 if (s->s3->tmp.new_compression == NULL)
 791                         *(p++)=0;
 792                 else
 793                         *(p++)=s->s3->tmp.new_compression->id;
 794 #endif
 795
 796 #ifndef OPENSSL_NO_TLSEXT
 797                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 798                         {
 799                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 800                         return -1;
 801                         }
 802 #endif
 803
 804                 /* do the header */
 805                 l=(p-d);
 806                 d=buf;
 807
 808                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 809
 810                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 811                 /* number of bytes to write */
 812                 s->init_num=p-buf;
 813                 s->init_off=0;
 814
 815                 /* buffer the message to handle re-xmits */
 816                 dtls1_buffer_message(s, 0);
 817                 }
 818
 819         /* SSL3_ST_SW_SRVR_HELLO_B */
 820         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 821         }
 822
 823 int dtls1_send_server_done(SSL *s)
 824         {
 825         unsigned char *p;
 826
 827         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 828                 {
 829                 p=(unsigned char *)s->init_buf->data;
 830
 831                 /* do the header */
 832                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 833
 834                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 835                 /* number of bytes to write */
 836                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 837                 s->init_off=0;
 838
 839                 /* buffer the message to handle re-xmits */
 840                 dtls1_buffer_message(s, 0);
 841                 }
 842
 843         /* SSL3_ST_SW_SRVR_DONE_B */
 844         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 845         }
 846
 847 int dtls1_send_server_key_exchange(SSL *s)
 848         {
 849 #ifndef OPENSSL_NO_RSA
 850         unsigned char *q;
 851         int j,num;
 852         RSA *rsa;
 853         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 854         unsigned int u;
 855 #endif
 856 #ifndef OPENSSL_NO_DH
 857         DH *dh=NULL,*dhp;
 858 #endif
 859         EVP_PKEY *pkey;
 860         unsigned char *p,*d;
 861         int al,i;
 862         unsigned long type;
 863         int n;
 864         CERT *cert;
 865         BIGNUM *r[4];
 866         int nr[4],kn;
 867         BUF_MEM *buf;
 868         EVP_MD_CTX md_ctx;
 869
 870         EVP_MD_CTX_init(&md_ctx);
 871         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 872                 {
 873                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
 874                 cert=s->cert;
 875
 876                 buf=s->init_buf;
 877
 878                 r[0]=r[1]=r[2]=r[3]=NULL;
 879                 n=0;
 880 #ifndef OPENSSL_NO_RSA
 881                 if (type & SSL_kRSA)
 882                         {
 883                         rsa=cert->rsa_tmp;
 884                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 885                                 {
 886                                 rsa=s->cert->rsa_tmp_cb(s,
 887                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 888                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 889                                 if(rsa == NULL)
 890                                 {
 891                                         al=SSL_AD_HANDSHAKE_FAILURE;
 892                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 893                                         goto f_err;
 894                                 }
 895                                 RSA_up_ref(rsa);
 896                                 cert->rsa_tmp=rsa;
 897                                 }
 898                         if (rsa == NULL)
 899                                 {
 900                                 al=SSL_AD_HANDSHAKE_FAILURE;
 901                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 902                                 goto f_err;
 903                                 }
 904                         r[0]=rsa->n;
 905                         r[1]=rsa->e;
 906                         s->s3->tmp.use_rsa_tmp=1;
 907                         }
 908                 else
 909 #endif
 910 #ifndef OPENSSL_NO_DH
 911                         if (type & SSL_kEDH)
 912                         {
 913                         dhp=cert->dh_tmp;
 914                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 915                                 dhp=s->cert->dh_tmp_cb(s,
 916                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 917                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 918                         if (dhp == NULL)
 919                                 {
 920                                 al=SSL_AD_HANDSHAKE_FAILURE;
 921                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 922                                 goto f_err;
 923                                 }
 924
 925                         if (s->s3->tmp.dh != NULL)
 926                                 {
 927                                 DH_free(dh);
 928                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 929                                 goto err;
 930                                 }
 931
 932                         if ((dh=DHparams_dup(dhp)) == NULL)
 933                                 {
 934                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 935                                 goto err;
 936                                 }
 937
 938                         s->s3->tmp.dh=dh;
 939                         if ((dhp->pub_key == NULL ||
 940                              dhp->priv_key == NULL ||
 941                              (s->options & SSL_OP_SINGLE_DH_USE)))
 942                                 {
 943                                 if(!DH_generate_key(dh))
 944                                     {
 945                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 946                                            ERR_R_DH_LIB);
 947                                     goto err;
 948                                     }
 949                                 }
 950                         else
 951                                 {
 952                                 dh->pub_key=BN_dup(dhp->pub_key);
 953                                 dh->priv_key=BN_dup(dhp->priv_key);
 954                                 if ((dh->pub_key == NULL) ||
 955                                         (dh->priv_key == NULL))
 956                                         {
 957                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 958                                         goto err;
 959                                         }
 960                                 }
 961                         r[0]=dh->p;
 962                         r[1]=dh->g;
 963                         r[2]=dh->pub_key;
 964                         }
 965                 else
 966 #endif
 967                         {
 968                         al=SSL_AD_HANDSHAKE_FAILURE;
 969                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
 970                         goto f_err;
 971                         }
 972                 for (i=0; r[i] != NULL; i++)
 973                         {
 974                         nr[i]=BN_num_bytes(r[i]);
 975                         n+=2+nr[i];
 976                         }
 977
 978                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 979                         {
 980                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
 981                                 == NULL)
 982                                 {
 983                                 al=SSL_AD_DECODE_ERROR;
 984                                 goto f_err;
 985                                 }
 986                         kn=EVP_PKEY_size(pkey);
 987                         }
 988                 else
 989                         {
 990                         pkey=NULL;
 991                         kn=0;
 992                         }
 993
 994                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
 995                         {
 996                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
 997                         goto err;
 998                         }
 999                 d=(unsigned char *)s->init_buf->data;
1000                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1001
1002                 for (i=0; r[i] != NULL; i++)
1003                         {
1004                         s2n(nr[i],p);
1005                         BN_bn2bin(r[i],p);
1006                         p+=nr[i];
1007                         }
1008
1009                 /* not anonymous */
1010                 if (pkey != NULL)
1011                         {
1012                         /* n is the length of the params, they start at
1013                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1014                          * at the end. */
1015 #ifndef OPENSSL_NO_RSA
1016                         if (pkey->type == EVP_PKEY_RSA)
1017                                 {
1018                                 q=md_buf;
1019                                 j=0;
1020                                 for (num=2; num > 0; num--)
1021                                         {
1022                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1023                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1024                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1025                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1026                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1027                                         EVP_DigestFinal_ex(&md_ctx,q,
1028                                                 (unsigned int *)&i);
1029                                         q+=i;
1030                                         j+=i;
1031                                         }
1032                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1033                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1034                                         {
1035                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1036                                         goto err;
1037                                         }
1038                                 s2n(u,p);
1039                                 n+=u+2;
1040                                 }
1041                         else
1042 #endif
1043 #if !defined(OPENSSL_NO_DSA)
1044                                 if (pkey->type == EVP_PKEY_DSA)
1045                                 {
1046                                 /* lets do DSS */
1047                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1048                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1049                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1050                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1051                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1052                                         (unsigned int *)&i,pkey))
1053                                         {
1054                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1055                                         goto err;
1056                                         }
1057                                 s2n(i,p);
1058                                 n+=i+2;
1059                                 }
1060                         else
1061 #endif
1062                                 {
1063                                 /* Is this error check actually needed? */
1064                                 al=SSL_AD_HANDSHAKE_FAILURE;
1065                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1066                                 goto f_err;
1067                                 }
1068                         }
1069
1070                 d = dtls1_set_message_header(s, d,
1071                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1072
1073                 /* we should now have things packed up, so lets send
1074                  * it off */
1075                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1076                 s->init_off=0;
1077
1078                 /* buffer the message to handle re-xmits */
1079                 dtls1_buffer_message(s, 0);
1080                 }
1081
1082         s->state = SSL3_ST_SW_KEY_EXCH_B;
1083         EVP_MD_CTX_cleanup(&md_ctx);
1084         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1085 f_err:
1086         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1087 err:
1088         EVP_MD_CTX_cleanup(&md_ctx);
1089         return(-1);
1090         }
1091
1092 int dtls1_send_certificate_request(SSL *s)
1093         {
1094         unsigned char *p,*d;
1095         int i,j,nl,off,n;
1096         STACK_OF(X509_NAME) *sk=NULL;
1097         X509_NAME *name;
1098         BUF_MEM *buf;
1099         unsigned int msg_len;
1100
1101         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1102                 {
1103                 buf=s->init_buf;
1104
1105                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1106
1107                 /* get the list of acceptable cert types */
1108                 p++;
1109                 n=ssl3_get_req_cert_type(s,p);
1110                 d[0]=n;
1111                 p+=n;
1112                 n++;
1113
1114                 off=n;
1115                 p+=2;
1116                 n+=2;
1117
1118                 sk=SSL_get_client_CA_list(s);
1119                 nl=0;
1120                 if (sk != NULL)
1121                         {
1122                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1123                                 {
1124                                 name=sk_X509_NAME_value(sk,i);
1125                                 j=i2d_X509_NAME(name,NULL);
1126                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1127                                         {
1128                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1129                                         goto err;
1130                                         }
1131                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1132                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1133                                         {
1134                                         s2n(j,p);
1135                                         i2d_X509_NAME(name,&p);
1136                                         n+=2+j;
1137                                         nl+=2+j;
1138                                         }
1139                                 else
1140                                         {
1141                                         d=p;
1142                                         i2d_X509_NAME(name,&p);
1143                                         j-=2; s2n(j,d); j+=2;
1144                                         n+=j;
1145                                         nl+=j;
1146                                         }
1147                                 }
1148                         }
1149                 /* else no CA names */
1150                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1151                 s2n(nl,p);
1152
1153                 d=(unsigned char *)buf->data;
1154                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1155                 l2n3(n,d);
1156                 s2n(s->d1->handshake_write_seq,d);
1157                 s->d1->handshake_write_seq++;
1158
1159                 /* we should now have things packed up, so lets send
1160                  * it off */
1161
1162                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1163                 s->init_off=0;
1164 #ifdef NETSCAPE_HANG_BUG
1165 /* XXX: what to do about this? */
1166                 p=(unsigned char *)s->init_buf->data + s->init_num;
1167
1168                 /* do the header */
1169                 *(p++)=SSL3_MT_SERVER_DONE;
1170                 *(p++)=0;
1171                 *(p++)=0;
1172                 *(p++)=0;
1173                 s->init_num += 4;
1174 #endif
1175
1176                 /* XDTLS:  set message header ? */
1177                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1178                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1179                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1180
1181                 /* buffer the message to handle re-xmits */
1182                 dtls1_buffer_message(s, 0);
1183
1184                 s->state = SSL3_ST_SW_CERT_REQ_B;
1185                 }
1186
1187         /* SSL3_ST_SW_CERT_REQ_B */
1188         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1189 err:
1190         return(-1);
1191         }
1192
1193 int dtls1_send_server_certificate(SSL *s)
1194         {
1195         unsigned long l;
1196         X509 *x;
1197
1198         if (s->state == SSL3_ST_SW_CERT_A)
1199                 {
1200                 x=ssl_get_server_send_cert(s);
1201                 if (x == NULL &&
1202                         /* VRS: allow null cert if auth == KRB5 */
1203                         (s->s3->tmp.new_cipher->algorithms
1204                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1205                         != (SSL_aKRB5|SSL_kKRB5))
1206                         {
1207                         SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1208                         return(0);
1209                         }
1210
1211                 l=dtls1_output_cert_chain(s,x);
1212                 s->state=SSL3_ST_SW_CERT_B;
1213                 s->init_num=(int)l;
1214                 s->init_off=0;
1215
1216                 /* buffer the message to handle re-xmits */
1217                 dtls1_buffer_message(s, 0);
1218                 }
1219
1220         /* SSL3_ST_SW_CERT_B */
1221         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1222         }
1223
1224 #ifndef OPENSSL_NO_TLSEXT
1225 int dtls1_send_newsession_ticket(SSL *s)
1226         {
1227         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1228                 {
1229                 unsigned char *p, *senc, *macstart;
1230                 int len, slen;
1231                 unsigned int hlen, msg_len;
1232                 EVP_CIPHER_CTX ctx;
1233                 HMAC_CTX hctx;
1234                 SSL_CTX *tctx = s->initial_ctx;
1235                 unsigned char iv[EVP_MAX_IV_LENGTH];
1236                 unsigned char key_name[16];
1237
1238                 /* get session encoding length */
1239                 slen = i2d_SSL_SESSION(s->session, NULL);
1240                 /* Some length values are 16 bits, so forget it if session is
1241                  * too long
1242                  */
1243                 if (slen > 0xFF00)
1244                         return -1;
1245                 /* Grow buffer if need be: the length calculation is as
1246                  * follows 12 (DTLS handshake message header) +
1247                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1248                  * 16 (key name) + max_iv_len (iv length) +
1249                  * session_length + max_enc_block_size (max encrypted session
1250                  * length) + max_md_size (HMAC).
1251                  */
1252                 if (!BUF_MEM_grow(s->init_buf,
1253                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1254                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1255                         return -1;
1256                 senc = OPENSSL_malloc(slen);
1257                 if (!senc)
1258                         return -1;
1259                 p = senc;
1260                 i2d_SSL_SESSION(s->session, &p);
1261
1262                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1263                 EVP_CIPHER_CTX_init(&ctx);
1264                 HMAC_CTX_init(&hctx);
1265                 /* Initialize HMAC and cipher contexts. If callback present
1266                  * it does all the work otherwise use generated values
1267                  * from parent ctx.
1268                  */
1269                 if (tctx->tlsext_ticket_key_cb)
1270                         {
1271                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1272                                                          &hctx, 1) < 0)
1273                                 {
1274                                 OPENSSL_free(senc);
1275                                 return -1;
1276                                 }
1277                         }
1278                 else
1279                         {
1280                         RAND_pseudo_bytes(iv, 16);
1281                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1282                                         tctx->tlsext_tick_aes_key, iv);
1283                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1284                                         tlsext_tick_md(), NULL);
1285                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1286                         }
1287                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1288                 /* Skip ticket length for now */
1289                 p += 2;
1290                 /* Output key name */
1291                 macstart = p;
1292                 memcpy(p, key_name, 16);
1293                 p += 16;
1294                 /* output IV */
1295                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1296                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1297                 /* Encrypt session data */
1298                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1299                 p += len;
1300                 EVP_EncryptFinal(&ctx, p, &len);
1301                 p += len;
1302                 EVP_CIPHER_CTX_cleanup(&ctx);
1303
1304                 HMAC_Update(&hctx, macstart, p - macstart);
1305                 HMAC_Final(&hctx, p, &hlen);
1306                 HMAC_CTX_cleanup(&hctx);
1307
1308                 p += hlen;
1309                 /* Now write out lengths: p points to end of data written */
1310                 /* Total length */
1311                 len = p - (unsigned char *)(s->init_buf->data);
1312                 /* Ticket length */
1313                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1314                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1315
1316                 /* number of bytes to write */
1317                 s->init_num= len;
1318                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1319                 s->init_off=0;
1320                 OPENSSL_free(senc);
1321
1322                 /* XDTLS:  set message header ? */
1323                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1324                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1325                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1326
1327                 /* buffer the message to handle re-xmits */
1328                 dtls1_buffer_message(s, 0);
1329                 }
1330
1331         /* SSL3_ST_SW_SESSION_TICKET_B */
1332         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1333         }
1334 #endif