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) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         unsigned long alg_k;
 151         int ret= -1;
 152         int new_state,state,skip=0;
 153
 154         RAND_add(&Time,sizeof(Time),0);
 155         ERR_clear_error();
 156         clear_sys_error();
 157
 158         if (s->info_callback != NULL)
 159                 cb=s->info_callback;
 160         else if (s->ctx->info_callback != NULL)
 161                 cb=s->ctx->info_callback;
 162
 163         /* init things to blank */
 164         s->in_handshake++;
 165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 166
 167         if (s->cert == NULL)
 168                 {
 169                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 170                 return(-1);
 171                 }
 172
 173         for (;;)
 174                 {
 175                 state=s->state;
 176
 177                 switch (s->state)
 178                         {
 179                 case SSL_ST_RENEGOTIATE:
 180                         s->renegotiate=1;
 181                         /* s->state=SSL_ST_ACCEPT; */
 182
 183                 case SSL_ST_BEFORE:
 184                 case SSL_ST_ACCEPT:
 185                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 186                 case SSL_ST_OK|SSL_ST_ACCEPT:
 187
 188                         s->server=1;
 189                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 190
 191                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 192                                 {
 193                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 194                                 return -1;
 195                                 }
 196                         s->type=SSL_ST_ACCEPT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 }
 212
 213                         if (!ssl3_setup_buffers(s))
 214                                 {
 215                                 ret= -1;
 216                                 goto end;
 217                                 }
 218
 219                         s->init_num=0;
 220
 221                         if (s->state != SSL_ST_RENEGOTIATE)
 222                                 {
 223                                 /* Ok, we now need to push on a buffering BIO so that
 224                                  * the output is sent in a way that TCP likes :-)
 225                                  */
 226                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 227
 228                                 ssl3_init_finished_mac(s);
 229                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 230                                 s->ctx->stats.sess_accept++;
 231                                 }
 232                         else
 233                                 {
 234                                 /* s->state == SSL_ST_RENEGOTIATE,
 235                                  * we will just send a HelloRequest */
 236                                 s->ctx->stats.sess_accept_renegotiate++;
 237                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 238                                 }
 239
 240                         break;
 241
 242                 case SSL3_ST_SW_HELLO_REQ_A:
 243                 case SSL3_ST_SW_HELLO_REQ_B:
 244
 245                         s->shutdown=0;
 246                         dtls1_start_timer(s);
 247                         ret=dtls1_send_hello_request(s);
 248                         if (ret <= 0) goto end;
 249                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 250                         s->state=SSL3_ST_SW_FLUSH;
 251                         s->init_num=0;
 252
 253                         ssl3_init_finished_mac(s);
 254                         break;
 255
 256                 case SSL3_ST_SW_HELLO_REQ_C:
 257                         s->state=SSL_ST_OK;
 258                         break;
 259
 260                 case SSL3_ST_SR_CLNT_HELLO_A:
 261                 case SSL3_ST_SR_CLNT_HELLO_B:
 262                 case SSL3_ST_SR_CLNT_HELLO_C:
 263
 264                         s->shutdown=0;
 265                         ret=ssl3_get_client_hello(s);
 266                         if (ret <= 0) goto end;
 267                         dtls1_stop_timer(s);
 268
 269                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 270                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 271                         else
 272                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 273
 274                         s->init_num=0;
 275
 276                         /* If we're just listening, stop here */
 277                         if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 278                                 {
 279                                 ret = 2;
 280                                 s->d1->listen = 0;
 281                                 /* Set expected sequence numbers
 282                                  * to continue the handshake.
 283                                  */
 284                                 s->d1->handshake_read_seq = 2;
 285                                 s->d1->handshake_write_seq = 1;
 286                                 s->d1->next_handshake_write_seq = 1;
 287                                 goto end;
 288                                 }
 289
 290                         break;
 291
 292                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 293                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 294
 295                         dtls1_start_timer(s);
 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                         /* HelloVerifyRequest resets Finished MAC */
 302                         if (s->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->renegotiate = 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 or normal PSK */
 333                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 334                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 335                                 {
 336                                 dtls1_start_timer(s);
 337                                 ret=dtls1_send_server_certificate(s);
 338                                 if (ret <= 0) goto end;
 339 #ifndef OPENSSL_NO_TLSEXT
 340                                 if (s->tlsext_status_expected)
 341                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 342                                 else
 343                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 344                                 }
 345                         else
 346                                 {
 347                                 skip = 1;
 348                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 349                                 }
 350 #else
 351                                 }
 352                         else
 353                                 skip=1;
 354
 355                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 356 #endif
 357                         s->init_num=0;
 358                         break;
 359
 360                 case SSL3_ST_SW_KEY_EXCH_A:
 361                 case SSL3_ST_SW_KEY_EXCH_B:
 362                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 363
 364                         /* clear this, it may get reset by
 365                          * send_server_key_exchange */
 366                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 367 #ifndef OPENSSL_NO_KRB5
 368                                 && !(alg_k & SSL_kKRB5)
 369 #endif /* OPENSSL_NO_KRB5 */
 370                                 )
 371                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 372                                  * even when forbidden by protocol specs
 373                                  * (handshake may fail as clients are not required to
 374                                  * be able to handle this) */
 375                                 s->s3->tmp.use_rsa_tmp=1;
 376                         else
 377                                 s->s3->tmp.use_rsa_tmp=0;
 378
 379                         /* only send if a DH key exchange or
 380                          * RSA but we have a sign only certificate */
 381                         if (s->s3->tmp.use_rsa_tmp
 382                         /* PSK: send ServerKeyExchange if PSK identity
 383                          * hint if provided */
 384 #ifndef OPENSSL_NO_PSK
 385                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 386 #endif
 387                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 388                             || (alg_k & SSL_kEECDH)
 389                             || ((alg_k & SSL_kRSA)
 390                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 391                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 392                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 393                                         )
 394                                     )
 395                                 )
 396                             )
 397                                 {
 398                                 dtls1_start_timer(s);
 399                                 ret=dtls1_send_server_key_exchange(s);
 400                                 if (ret <= 0) goto end;
 401                                 }
 402                         else
 403                                 skip=1;
 404
 405                         s->state=SSL3_ST_SW_CERT_REQ_A;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_SW_CERT_REQ_A:
 410                 case SSL3_ST_SW_CERT_REQ_B:
 411                         if (/* don't request cert unless asked for it: */
 412                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 413                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 414                                  * don't request cert during re-negotiation: */
 415                                 ((s->session->peer != NULL) &&
 416                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 417                                 /* never request cert in anonymous ciphersuites
 418                                  * (see section "Certificate request" in SSL 3 drafts
 419                                  * and in RFC 2246): */
 420                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 421                                  /* ... except when the application insists on verification
 422                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 423                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 424                                  /* never request cert in Kerberos ciphersuites */
 425                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 426                                 /* With normal PSK Certificates and
 427                                  * Certificate Requests are omitted */
 428                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 429                                 {
 430                                 /* no cert request */
 431                                 skip=1;
 432                                 s->s3->tmp.cert_request=0;
 433                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 434                                 }
 435                         else
 436                                 {
 437                                 s->s3->tmp.cert_request=1;
 438                                 dtls1_start_timer(s);
 439                                 ret=dtls1_send_certificate_request(s);
 440                                 if (ret <= 0) goto end;
 441 #ifndef NETSCAPE_HANG_BUG
 442                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 443 #else
 444                                 s->state=SSL3_ST_SW_FLUSH;
 445                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 446 #endif
 447                                 s->init_num=0;
 448                                 }
 449                         break;
 450
 451                 case SSL3_ST_SW_SRVR_DONE_A:
 452                 case SSL3_ST_SW_SRVR_DONE_B:
 453                         dtls1_start_timer(s);
 454                         ret=dtls1_send_server_done(s);
 455                         if (ret <= 0) goto end;
 456                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 457                         s->state=SSL3_ST_SW_FLUSH;
 458                         s->init_num=0;
 459                         break;
 460
 461                 case SSL3_ST_SW_FLUSH:
 462                         s->rwstate=SSL_WRITING;
 463                         if (BIO_flush(s->wbio) <= 0)
 464                                 {
 465                                 ret= -1;
 466                                 goto end;
 467                                 }
 468                         s->rwstate=SSL_NOTHING;
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL3_ST_SR_CERT_A:
 473                 case SSL3_ST_SR_CERT_B:
 474                         /* Check for second client hello (MS SGC) */
 475                         ret = ssl3_check_client_hello(s);
 476                         if (ret <= 0)
 477                                 goto end;
 478                         dtls1_stop_timer(s);
 479                         if (ret == 2)
 480                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 481                         else {
 482                                 /* could be sent for a DH cert, even if we
 483                                  * have not asked for it :-) */
 484                                 ret=ssl3_get_client_certificate(s);
 485                                 if (ret <= 0) goto end;
 486                                 dtls1_stop_timer(s);
 487                                 s->init_num=0;
 488                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 489                         }
 490                         break;
 491
 492                 case SSL3_ST_SR_KEY_EXCH_A:
 493                 case SSL3_ST_SR_KEY_EXCH_B:
 494                         ret=ssl3_get_client_key_exchange(s);
 495                         if (ret <= 0) goto end;
 496                         dtls1_stop_timer(s);
 497                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 498                         s->init_num=0;
 499
 500                         if (ret == 2)
 501                                 {
 502                                 /* For the ECDH ciphersuites when
 503                                  * the client sends its ECDH pub key in
 504                                  * a certificate, the CertificateVerify
 505                                  * message is not sent.
 506                                  */
 507                                 s->state=SSL3_ST_SR_FINISHED_A;
 508                                 s->init_num = 0;
 509                                 }
 510                         else
 511                                 {
 512                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 513                                 s->init_num=0;
 514
 515                                 /* We need to get hashes here so if there is
 516                                  * a client cert, it can be verified */
 517                                 s->method->ssl3_enc->cert_verify_mac(s,
 518                                         NID_md5,
 519                                         &(s->s3->tmp.cert_verify_md[0]));
 520                                 s->method->ssl3_enc->cert_verify_mac(s,
 521                                         NID_sha1,
 522                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 523                                 }
 524                         break;
 525
 526                 case SSL3_ST_SR_CERT_VRFY_A:
 527                 case SSL3_ST_SR_CERT_VRFY_B:
 528
 529                         s->d1->change_cipher_spec_ok = 1;
 530                         /* we should decide if we expected this one */
 531                         ret=ssl3_get_cert_verify(s);
 532                         if (ret <= 0) goto end;
 533                         dtls1_stop_timer(s);
 534
 535                         s->state=SSL3_ST_SR_FINISHED_A;
 536                         s->init_num=0;
 537                         break;
 538
 539                 case SSL3_ST_SR_FINISHED_A:
 540                 case SSL3_ST_SR_FINISHED_B:
 541                         s->d1->change_cipher_spec_ok = 1;
 542                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 543                                 SSL3_ST_SR_FINISHED_B);
 544                         if (ret <= 0) goto end;
 545                         dtls1_stop_timer(s);
 546                         if (s->hit)
 547                                 s->state=SSL_ST_OK;
 548 #ifndef OPENSSL_NO_TLSEXT
 549                         else if (s->tlsext_ticket_expected)
 550                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 551 #endif
 552                         else
 553                                 s->state=SSL3_ST_SW_CHANGE_A;
 554                         s->init_num=0;
 555                         break;
 556
 557 #ifndef OPENSSL_NO_TLSEXT
 558                 case SSL3_ST_SW_SESSION_TICKET_A:
 559                 case SSL3_ST_SW_SESSION_TICKET_B:
 560                         ret=dtls1_send_newsession_ticket(s);
 561                         if (ret <= 0) goto end;
 562                         s->state=SSL3_ST_SW_CHANGE_A;
 563                         s->init_num=0;
 564                         break;
 565
 566                 case SSL3_ST_SW_CERT_STATUS_A:
 567                 case SSL3_ST_SW_CERT_STATUS_B:
 568                         ret=ssl3_send_cert_status(s);
 569                         if (ret <= 0) goto end;
 570                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 571                         s->init_num=0;
 572                         break;
 573
 574 #endif
 575
 576                 case SSL3_ST_SW_CHANGE_A:
 577                 case SSL3_ST_SW_CHANGE_B:
 578
 579                         s->session->cipher=s->s3->tmp.new_cipher;
 580                         if (!s->method->ssl3_enc->setup_key_block(s))
 581                                 { ret= -1; goto end; }
 582
 583                         ret=dtls1_send_change_cipher_spec(s,
 584                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 585
 586                         if (ret <= 0) goto end;
 587                         s->state=SSL3_ST_SW_FINISHED_A;
 588                         s->init_num=0;
 589
 590                         if (!s->method->ssl3_enc->change_cipher_state(s,
 591                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 592                                 {
 593                                 ret= -1;
 594                                 goto end;
 595                                 }
 596
 597                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 598                         break;
 599
 600                 case SSL3_ST_SW_FINISHED_A:
 601                 case SSL3_ST_SW_FINISHED_B:
 602                         ret=dtls1_send_finished(s,
 603                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 604                                 s->method->ssl3_enc->server_finished_label,
 605                                 s->method->ssl3_enc->server_finished_label_len);
 606                         if (ret <= 0) goto end;
 607                         s->state=SSL3_ST_SW_FLUSH;
 608                         if (s->hit)
 609                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 610                         else
 611                                 s->s3->tmp.next_state=SSL_ST_OK;
 612                         s->init_num=0;
 613                         break;
 614
 615                 case SSL_ST_OK:
 616                         /* clean a few things up */
 617                         ssl3_cleanup_key_block(s);
 618
 619 #if 0
 620                         BUF_MEM_free(s->init_buf);
 621                         s->init_buf=NULL;
 622 #endif
 623
 624                         /* remove buffering on output */
 625                         ssl_free_wbio_buffer(s);
 626
 627                         s->init_num=0;
 628
 629                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 630                                 {
 631                                 /* actually not necessarily a 'new' session unless
 632                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 633
 634                                 s->renegotiate=0;
 635                                 s->new_session=0;
 636
 637                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 638
 639                                 s->ctx->stats.sess_accept_good++;
 640                                 /* s->server=1; */
 641                                 s->handshake_func=dtls1_accept;
 642
 643                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 644                                 }
 645
 646                         ret = 1;
 647
 648                         /* done handshaking, next message is client hello */
 649                         s->d1->handshake_read_seq = 0;
 650                         /* next message is server hello */
 651                         s->d1->handshake_write_seq = 0;
 652                         s->d1->next_handshake_write_seq = 0;
 653                         goto end;
 654                         /* break; */
 655
 656                 default:
 657                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 658                         ret= -1;
 659                         goto end;
 660                         /* break; */
 661                         }
 662
 663                 if (!s->s3->tmp.reuse_message && !skip)
 664                         {
 665                         if (s->debug)
 666                                 {
 667                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 668                                         goto end;
 669                                 }
 670
 671
 672                         if ((cb != NULL) && (s->state != state))
 673                                 {
 674                                 new_state=s->state;
 675                                 s->state=state;
 676                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 677                                 s->state=new_state;
 678                                 }
 679                         }
 680                 skip=0;
 681                 }
 682 end:
 683         /* BIO_flush(s->wbio); */
 684
 685         s->in_handshake--;
 686         if (cb != NULL)
 687                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 688         return(ret);
 689         }
 690
 691 int dtls1_send_hello_request(SSL *s)
 692         {
 693         unsigned char *p;
 694
 695         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 696                 {
 697                 p=(unsigned char *)s->init_buf->data;
 698                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 699
 700                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 701                 /* number of bytes to write */
 702                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 703                 s->init_off=0;
 704
 705                 /* no need to buffer this message, since there are no retransmit
 706                  * requests for it */
 707                 }
 708
 709         /* SSL3_ST_SW_HELLO_REQ_B */
 710         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 711         }
 712
 713 int dtls1_send_hello_verify_request(SSL *s)
 714         {
 715         unsigned int msg_len;
 716         unsigned char *msg, *buf, *p;
 717
 718         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 719                 {
 720                 buf = (unsigned char *)s->init_buf->data;
 721
 722                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 723                 *(p++) = s->version >> 8;
 724                 *(p++) = s->version & 0xFF;
 725
 726                 if (s->ctx->app_gen_cookie_cb == NULL ||
 727                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 728                          &(s->d1->cookie_len)) == 0)
 729                         {
 730                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 731                         return 0;
 732                         }
 733
 734                 *(p++) = (unsigned char) s->d1->cookie_len;
 735                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 736                 p += s->d1->cookie_len;
 737                 msg_len = p - msg;
 738
 739                 dtls1_set_message_header(s, buf,
 740                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 741
 742                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 743                 /* number of bytes to write */
 744                 s->init_num=p-buf;
 745                 s->init_off=0;
 746                 }
 747
 748         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 749         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 750         }
 751
 752 int dtls1_send_server_hello(SSL *s)
 753         {
 754         unsigned char *buf;
 755         unsigned char *p,*d;
 756         int i;
 757         unsigned int sl;
 758         unsigned long l,Time;
 759
 760         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 761                 {
 762                 buf=(unsigned char *)s->init_buf->data;
 763                 p=s->s3->server_random;
 764                 Time=(unsigned long)time(NULL);                 /* Time */
 765                 l2n(Time,p);
 766                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 767                 /* Do the message type and length last */
 768                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 769
 770                 *(p++)=s->version>>8;
 771                 *(p++)=s->version&0xff;
 772
 773                 /* Random stuff */
 774                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 775                 p+=SSL3_RANDOM_SIZE;
 776
 777                 /* now in theory we have 3 options to sending back the
 778                  * session id.  If it is a re-use, we send back the
 779                  * old session-id, if it is a new session, we send
 780                  * back the new session-id or we send back a 0 length
 781                  * session-id if we want it to be single use.
 782                  * Currently I will not implement the '0' length session-id
 783                  * 12-Jan-98 - I'll now support the '0' length stuff.
 784                  */
 785                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 786                         s->session->session_id_length=0;
 787
 788                 sl=s->session->session_id_length;
 789                 if (sl > sizeof s->session->session_id)
 790                         {
 791                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 792                         return -1;
 793                         }
 794                 *(p++)=sl;
 795                 memcpy(p,s->session->session_id,sl);
 796                 p+=sl;
 797
 798                 /* put the cipher */
 799                 if (s->s3->tmp.new_cipher == NULL)
 800                         return -1;
 801                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 802                 p+=i;
 803
 804                 /* put the compression method */
 805 #ifdef OPENSSL_NO_COMP
 806                 *(p++)=0;
 807 #else
 808                 if (s->s3->tmp.new_compression == NULL)
 809                         *(p++)=0;
 810                 else
 811                         *(p++)=s->s3->tmp.new_compression->id;
 812 #endif
 813
 814 #ifndef OPENSSL_NO_TLSEXT
 815                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 816                         {
 817                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 818                         return -1;
 819                         }
 820 #endif
 821
 822                 /* do the header */
 823                 l=(p-d);
 824                 d=buf;
 825
 826                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 827
 828                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 829                 /* number of bytes to write */
 830                 s->init_num=p-buf;
 831                 s->init_off=0;
 832
 833                 /* buffer the message to handle re-xmits */
 834                 dtls1_buffer_message(s, 0);
 835                 }
 836
 837         /* SSL3_ST_SW_SRVR_HELLO_B */
 838         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 839         }
 840
 841 int dtls1_send_server_done(SSL *s)
 842         {
 843         unsigned char *p;
 844
 845         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 846                 {
 847                 p=(unsigned char *)s->init_buf->data;
 848
 849                 /* do the header */
 850                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 851
 852                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 853                 /* number of bytes to write */
 854                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 855                 s->init_off=0;
 856
 857                 /* buffer the message to handle re-xmits */
 858                 dtls1_buffer_message(s, 0);
 859                 }
 860
 861         /* SSL3_ST_SW_SRVR_DONE_B */
 862         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 863         }
 864
 865 int dtls1_send_server_key_exchange(SSL *s)
 866         {
 867 #ifndef OPENSSL_NO_RSA
 868         unsigned char *q;
 869         int j,num;
 870         RSA *rsa;
 871         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 872         unsigned int u;
 873 #endif
 874 #ifndef OPENSSL_NO_DH
 875         DH *dh=NULL,*dhp;
 876 #endif
 877 #ifndef OPENSSL_NO_ECDH
 878         EC_KEY *ecdh=NULL, *ecdhp;
 879         unsigned char *encodedPoint = NULL;
 880         int encodedlen = 0;
 881         int curve_id = 0;
 882         BN_CTX *bn_ctx = NULL;
 883 #endif
 884         EVP_PKEY *pkey;
 885         unsigned char *p,*d;
 886         int al,i;
 887         unsigned long type;
 888         int n;
 889         CERT *cert;
 890         BIGNUM *r[4];
 891         int nr[4],kn;
 892         BUF_MEM *buf;
 893         EVP_MD_CTX md_ctx;
 894
 895         EVP_MD_CTX_init(&md_ctx);
 896         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 897                 {
 898                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 899                 cert=s->cert;
 900
 901                 buf=s->init_buf;
 902
 903                 r[0]=r[1]=r[2]=r[3]=NULL;
 904                 n=0;
 905 #ifndef OPENSSL_NO_RSA
 906                 if (type & SSL_kRSA)
 907                         {
 908                         rsa=cert->rsa_tmp;
 909                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 910                                 {
 911                                 rsa=s->cert->rsa_tmp_cb(s,
 912                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 913                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 914                                 if(rsa == NULL)
 915                                 {
 916                                         al=SSL_AD_HANDSHAKE_FAILURE;
 917                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 918                                         goto f_err;
 919                                 }
 920                                 RSA_up_ref(rsa);
 921                                 cert->rsa_tmp=rsa;
 922                                 }
 923                         if (rsa == NULL)
 924                                 {
 925                                 al=SSL_AD_HANDSHAKE_FAILURE;
 926                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 927                                 goto f_err;
 928                                 }
 929                         r[0]=rsa->n;
 930                         r[1]=rsa->e;
 931                         s->s3->tmp.use_rsa_tmp=1;
 932                         }
 933                 else
 934 #endif
 935 #ifndef OPENSSL_NO_DH
 936                         if (type & SSL_kEDH)
 937                         {
 938                         dhp=cert->dh_tmp;
 939                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 940                                 dhp=s->cert->dh_tmp_cb(s,
 941                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 942                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 943                         if (dhp == NULL)
 944                                 {
 945                                 al=SSL_AD_HANDSHAKE_FAILURE;
 946                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 947                                 goto f_err;
 948                                 }
 949
 950                         if (s->s3->tmp.dh != NULL)
 951                                 {
 952                                 DH_free(dh);
 953                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 954                                 goto err;
 955                                 }
 956
 957                         if ((dh=DHparams_dup(dhp)) == NULL)
 958                                 {
 959                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 960                                 goto err;
 961                                 }
 962
 963                         s->s3->tmp.dh=dh;
 964                         if ((dhp->pub_key == NULL ||
 965                              dhp->priv_key == NULL ||
 966                              (s->options & SSL_OP_SINGLE_DH_USE)))
 967                                 {
 968                                 if(!DH_generate_key(dh))
 969                                     {
 970                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 971                                            ERR_R_DH_LIB);
 972                                     goto err;
 973                                     }
 974                                 }
 975                         else
 976                                 {
 977                                 dh->pub_key=BN_dup(dhp->pub_key);
 978                                 dh->priv_key=BN_dup(dhp->priv_key);
 979                                 if ((dh->pub_key == NULL) ||
 980                                         (dh->priv_key == NULL))
 981                                         {
 982                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 983                                         goto err;
 984                                         }
 985                                 }
 986                         r[0]=dh->p;
 987                         r[1]=dh->g;
 988                         r[2]=dh->pub_key;
 989                         }
 990                 else
 991 #endif
 992 #ifndef OPENSSL_NO_ECDH
 993                         if (type & SSL_kEECDH)
 994                         {
 995                         const EC_GROUP *group;
 996
 997                         ecdhp=cert->ecdh_tmp;
 998                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
 999                                 {
1000                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1001                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1002                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1003                                 }
1004                         if (ecdhp == NULL)
1005                                 {
1006                                 al=SSL_AD_HANDSHAKE_FAILURE;
1007                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1008                                 goto f_err;
1009                                 }
1010
1011                         if (s->s3->tmp.ecdh != NULL)
1012                                 {
1013                                 EC_KEY_free(s->s3->tmp.ecdh);
1014                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1015                                 goto err;
1016                                 }
1017
1018                         /* Duplicate the ECDH structure. */
1019                         if (ecdhp == NULL)
1020                                 {
1021                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1022                                 goto err;
1023                                 }
1024                         if (!EC_KEY_up_ref(ecdhp))
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1027                                 goto err;
1028                                 }
1029                         ecdh = ecdhp;
1030
1031                         s->s3->tmp.ecdh=ecdh;
1032                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1033                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1034                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1035                                 {
1036                                 if(!EC_KEY_generate_key(ecdh))
1037                                     {
1038                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039                                     goto err;
1040                                     }
1041                                 }
1042
1043                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1044                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1045                             (EC_KEY_get0_private_key(ecdh) == NULL))
1046                                 {
1047                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1048                                 goto err;
1049                                 }
1050
1051                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1052                             (EC_GROUP_get_degree(group) > 163))
1053                                 {
1054                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1055                                 goto err;
1056                                 }
1057
1058                         /* XXX: For now, we only support ephemeral ECDH
1059                          * keys over named (not generic) curves. For
1060                          * supported named curves, curve_id is non-zero.
1061                          */
1062                         if ((curve_id =
1063                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1064                             == 0)
1065                                 {
1066                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1067                                 goto err;
1068                                 }
1069
1070                         /* Encode the public key.
1071                          * First check the size of encoding and
1072                          * allocate memory accordingly.
1073                          */
1074                         encodedlen = EC_POINT_point2oct(group,
1075                             EC_KEY_get0_public_key(ecdh),
1076                             POINT_CONVERSION_UNCOMPRESSED,
1077                             NULL, 0, NULL);
1078
1079                         encodedPoint = (unsigned char *)
1080                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1081                         bn_ctx = BN_CTX_new();
1082                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1083                                 {
1084                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1085                                 goto err;
1086                                 }
1087
1088
1089                         encodedlen = EC_POINT_point2oct(group,
1090                             EC_KEY_get0_public_key(ecdh),
1091                             POINT_CONVERSION_UNCOMPRESSED,
1092                             encodedPoint, encodedlen, bn_ctx);
1093
1094                         if (encodedlen == 0)
1095                                 {
1096                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1097                                 goto err;
1098                                 }
1099
1100                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1101
1102                         /* XXX: For now, we only support named (not
1103                          * generic) curves in ECDH ephemeral key exchanges.
1104                          * In this situation, we need four additional bytes
1105                          * to encode the entire ServerECDHParams
1106                          * structure.
1107                          */
1108                         n = 4 + encodedlen;
1109
1110                         /* We'll generate the serverKeyExchange message
1111                          * explicitly so we can set these to NULLs
1112                          */
1113                         r[0]=NULL;
1114                         r[1]=NULL;
1115                         r[2]=NULL;
1116                         r[3]=NULL;
1117                         }
1118                 else
1119 #endif /* !OPENSSL_NO_ECDH */
1120 #ifndef OPENSSL_NO_PSK
1121                         if (type & SSL_kPSK)
1122                                 {
1123                                 /* reserve size for record length and PSK identity hint*/
1124                                 n+=2+strlen(s->ctx->psk_identity_hint);
1125                                 }
1126                         else
1127 #endif /* !OPENSSL_NO_PSK */
1128                         {
1129                         al=SSL_AD_HANDSHAKE_FAILURE;
1130                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1131                         goto f_err;
1132                         }
1133                 for (i=0; r[i] != NULL; i++)
1134                         {
1135                         nr[i]=BN_num_bytes(r[i]);
1136                         n+=2+nr[i];
1137                         }
1138
1139                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1140                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1141                         {
1142                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1143                                 == NULL)
1144                                 {
1145                                 al=SSL_AD_DECODE_ERROR;
1146                                 goto f_err;
1147                                 }
1148                         kn=EVP_PKEY_size(pkey);
1149                         }
1150                 else
1151                         {
1152                         pkey=NULL;
1153                         kn=0;
1154                         }
1155
1156                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1157                         {
1158                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1159                         goto err;
1160                         }
1161                 d=(unsigned char *)s->init_buf->data;
1162                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1163
1164                 for (i=0; r[i] != NULL; i++)
1165                         {
1166                         s2n(nr[i],p);
1167                         BN_bn2bin(r[i],p);
1168                         p+=nr[i];
1169                         }
1170
1171 #ifndef OPENSSL_NO_ECDH
1172                 if (type & SSL_kEECDH)
1173                         {
1174                         /* XXX: For now, we only support named (not generic) curves.
1175                          * In this situation, the serverKeyExchange message has:
1176                          * [1 byte CurveType], [2 byte CurveName]
1177                          * [1 byte length of encoded point], followed by
1178                          * the actual encoded point itself
1179                          */
1180                         *p = NAMED_CURVE_TYPE;
1181                         p += 1;
1182                         *p = 0;
1183                         p += 1;
1184                         *p = curve_id;
1185                         p += 1;
1186                         *p = encodedlen;
1187                         p += 1;
1188                         memcpy((unsigned char*)p,
1189                             (unsigned char *)encodedPoint,
1190                             encodedlen);
1191                         OPENSSL_free(encodedPoint);
1192                         p += encodedlen;
1193                         }
1194 #endif
1195
1196 #ifndef OPENSSL_NO_PSK
1197                 if (type & SSL_kPSK)
1198                         {
1199                         /* copy PSK identity hint */
1200                         s2n(strlen(s->ctx->psk_identity_hint), p);
1201                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1202                         p+=strlen(s->ctx->psk_identity_hint);
1203                         }
1204 #endif
1205
1206                 /* not anonymous */
1207                 if (pkey != NULL)
1208                         {
1209                         /* n is the length of the params, they start at
1210                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1211                          * at the end. */
1212 #ifndef OPENSSL_NO_RSA
1213                         if (pkey->type == EVP_PKEY_RSA)
1214                                 {
1215                                 q=md_buf;
1216                                 j=0;
1217                                 for (num=2; num > 0; num--)
1218                                         {
1219                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1220                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1221                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1222                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1223                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1224                                         EVP_DigestFinal_ex(&md_ctx,q,
1225                                                 (unsigned int *)&i);
1226                                         q+=i;
1227                                         j+=i;
1228                                         }
1229                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1230                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1231                                         {
1232                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1233                                         goto err;
1234                                         }
1235                                 s2n(u,p);
1236                                 n+=u+2;
1237                                 }
1238                         else
1239 #endif
1240 #if !defined(OPENSSL_NO_DSA)
1241                                 if (pkey->type == EVP_PKEY_DSA)
1242                                 {
1243                                 /* lets do DSS */
1244                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1245                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1246                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1247                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1248                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1249                                         (unsigned int *)&i,pkey))
1250                                         {
1251                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1252                                         goto err;
1253                                         }
1254                                 s2n(i,p);
1255                                 n+=i+2;
1256                                 }
1257                         else
1258 #endif
1259 #if !defined(OPENSSL_NO_ECDSA)
1260                                 if (pkey->type == EVP_PKEY_EC)
1261                                 {
1262                                 /* let's do ECDSA */
1263                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1264                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1265                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1266                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1267                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1268                                         (unsigned int *)&i,pkey))
1269                                         {
1270                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1271                                         goto err;
1272                                         }
1273                                 s2n(i,p);
1274                                 n+=i+2;
1275                                 }
1276                         else
1277 #endif
1278                                 {
1279                                 /* Is this error check actually needed? */
1280                                 al=SSL_AD_HANDSHAKE_FAILURE;
1281                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1282                                 goto f_err;
1283                                 }
1284                         }
1285
1286                 d = dtls1_set_message_header(s, d,
1287                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1288
1289                 /* we should now have things packed up, so lets send
1290                  * it off */
1291                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1292                 s->init_off=0;
1293
1294                 /* buffer the message to handle re-xmits */
1295                 dtls1_buffer_message(s, 0);
1296                 }
1297
1298         s->state = SSL3_ST_SW_KEY_EXCH_B;
1299         EVP_MD_CTX_cleanup(&md_ctx);
1300         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1301 f_err:
1302         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1303 err:
1304 #ifndef OPENSSL_NO_ECDH
1305         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1306         BN_CTX_free(bn_ctx);
1307 #endif
1308         EVP_MD_CTX_cleanup(&md_ctx);
1309         return(-1);
1310         }
1311
1312 int dtls1_send_certificate_request(SSL *s)
1313         {
1314         unsigned char *p,*d;
1315         int i,j,nl,off,n;
1316         STACK_OF(X509_NAME) *sk=NULL;
1317         X509_NAME *name;
1318         BUF_MEM *buf;
1319         unsigned int msg_len;
1320
1321         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1322                 {
1323                 buf=s->init_buf;
1324
1325                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1326
1327                 /* get the list of acceptable cert types */
1328                 p++;
1329                 n=ssl3_get_req_cert_type(s,p);
1330                 d[0]=n;
1331                 p+=n;
1332                 n++;
1333
1334                 off=n;
1335                 p+=2;
1336                 n+=2;
1337
1338                 sk=SSL_get_client_CA_list(s);
1339                 nl=0;
1340                 if (sk != NULL)
1341                         {
1342                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1343                                 {
1344                                 name=sk_X509_NAME_value(sk,i);
1345                                 j=i2d_X509_NAME(name,NULL);
1346                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1347                                         {
1348                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1349                                         goto err;
1350                                         }
1351                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1352                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1353                                         {
1354                                         s2n(j,p);
1355                                         i2d_X509_NAME(name,&p);
1356                                         n+=2+j;
1357                                         nl+=2+j;
1358                                         }
1359                                 else
1360                                         {
1361                                         d=p;
1362                                         i2d_X509_NAME(name,&p);
1363                                         j-=2; s2n(j,d); j+=2;
1364                                         n+=j;
1365                                         nl+=j;
1366                                         }
1367                                 }
1368                         }
1369                 /* else no CA names */
1370                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1371                 s2n(nl,p);
1372
1373                 d=(unsigned char *)buf->data;
1374                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1375                 l2n3(n,d);
1376                 s2n(s->d1->handshake_write_seq,d);
1377                 s->d1->handshake_write_seq++;
1378
1379                 /* we should now have things packed up, so lets send
1380                  * it off */
1381
1382                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1383                 s->init_off=0;
1384 #ifdef NETSCAPE_HANG_BUG
1385 /* XXX: what to do about this? */
1386                 p=(unsigned char *)s->init_buf->data + s->init_num;
1387
1388                 /* do the header */
1389                 *(p++)=SSL3_MT_SERVER_DONE;
1390                 *(p++)=0;
1391                 *(p++)=0;
1392                 *(p++)=0;
1393                 s->init_num += 4;
1394 #endif
1395
1396                 /* XDTLS:  set message header ? */
1397                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1398                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1399                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1400
1401                 /* buffer the message to handle re-xmits */
1402                 dtls1_buffer_message(s, 0);
1403
1404                 s->state = SSL3_ST_SW_CERT_REQ_B;
1405                 }
1406
1407         /* SSL3_ST_SW_CERT_REQ_B */
1408         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1409 err:
1410         return(-1);
1411         }
1412
1413 int dtls1_send_server_certificate(SSL *s)
1414         {
1415         unsigned long l;
1416         X509 *x;
1417
1418         if (s->state == SSL3_ST_SW_CERT_A)
1419                 {
1420                 x=ssl_get_server_send_cert(s);
1421                 if (x == NULL)
1422                         {
1423                         /* VRS: allow null cert if auth == KRB5 */
1424                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1425                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1426                                 {
1427                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1428                                 return(0);
1429                                 }
1430                         }
1431
1432                 l=dtls1_output_cert_chain(s,x);
1433                 s->state=SSL3_ST_SW_CERT_B;
1434                 s->init_num=(int)l;
1435                 s->init_off=0;
1436
1437                 /* buffer the message to handle re-xmits */
1438                 dtls1_buffer_message(s, 0);
1439                 }
1440
1441         /* SSL3_ST_SW_CERT_B */
1442         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1443         }
1444
1445 #ifndef OPENSSL_NO_TLSEXT
1446 int dtls1_send_newsession_ticket(SSL *s)
1447         {
1448         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1449                 {
1450                 unsigned char *p, *senc, *macstart;
1451                 int len, slen;
1452                 unsigned int hlen, msg_len;
1453                 EVP_CIPHER_CTX ctx;
1454                 HMAC_CTX hctx;
1455                 SSL_CTX *tctx = s->initial_ctx;
1456                 unsigned char iv[EVP_MAX_IV_LENGTH];
1457                 unsigned char key_name[16];
1458
1459                 /* get session encoding length */
1460                 slen = i2d_SSL_SESSION(s->session, NULL);
1461                 /* Some length values are 16 bits, so forget it if session is
1462                  * too long
1463                  */
1464                 if (slen > 0xFF00)
1465                         return -1;
1466                 /* Grow buffer if need be: the length calculation is as
1467                  * follows 12 (DTLS handshake message header) +
1468                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1469                  * 16 (key name) + max_iv_len (iv length) +
1470                  * session_length + max_enc_block_size (max encrypted session
1471                  * length) + max_md_size (HMAC).
1472                  */
1473                 if (!BUF_MEM_grow(s->init_buf,
1474                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1475                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1476                         return -1;
1477                 senc = OPENSSL_malloc(slen);
1478                 if (!senc)
1479                         return -1;
1480                 p = senc;
1481                 i2d_SSL_SESSION(s->session, &p);
1482
1483                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1484                 EVP_CIPHER_CTX_init(&ctx);
1485                 HMAC_CTX_init(&hctx);
1486                 /* Initialize HMAC and cipher contexts. If callback present
1487                  * it does all the work otherwise use generated values
1488                  * from parent ctx.
1489                  */
1490                 if (tctx->tlsext_ticket_key_cb)
1491                         {
1492                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1493                                                          &hctx, 1) < 0)
1494                                 {
1495                                 OPENSSL_free(senc);
1496                                 return -1;
1497                                 }
1498                         }
1499                 else
1500                         {
1501                         RAND_pseudo_bytes(iv, 16);
1502                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1503                                         tctx->tlsext_tick_aes_key, iv);
1504                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1505                                         tlsext_tick_md(), NULL);
1506                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1507                         }
1508                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1509                 /* Skip ticket length for now */
1510                 p += 2;
1511                 /* Output key name */
1512                 macstart = p;
1513                 memcpy(p, key_name, 16);
1514                 p += 16;
1515                 /* output IV */
1516                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1517                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1518                 /* Encrypt session data */
1519                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1520                 p += len;
1521                 EVP_EncryptFinal(&ctx, p, &len);
1522                 p += len;
1523                 EVP_CIPHER_CTX_cleanup(&ctx);
1524
1525                 HMAC_Update(&hctx, macstart, p - macstart);
1526                 HMAC_Final(&hctx, p, &hlen);
1527                 HMAC_CTX_cleanup(&hctx);
1528
1529                 p += hlen;
1530                 /* Now write out lengths: p points to end of data written */
1531                 /* Total length */
1532                 len = p - (unsigned char *)(s->init_buf->data);
1533                 /* Ticket length */
1534                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1535                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1536
1537                 /* number of bytes to write */
1538                 s->init_num= len;
1539                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1540                 s->init_off=0;
1541                 OPENSSL_free(senc);
1542
1543                 /* XDTLS:  set message header ? */
1544                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1545                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1546                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1547
1548                 /* buffer the message to handle re-xmits */
1549                 dtls1_buffer_message(s, 0);
1550                 }
1551
1552         /* SSL3_ST_SW_SESSION_TICKET_B */
1553         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1554         }
1555 #endif