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->new_session=1;
 181                         /* s->state=SSL_ST_ACCEPT; */
 182
 183                 case SSL_ST_BEFORE:
 184                 case SSL_ST_ACCEPT:
 185                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 186                 case SSL_ST_OK|SSL_ST_ACCEPT:
 187
 188                         s->server=1;
 189                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 190
 191                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 192                                 {
 193                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 194                                 return -1;
 195                                 }
 196                         s->type=SSL_ST_ACCEPT;
 197
 198                         if (s->init_buf == NULL)
 199                                 {
 200                                 if ((buf=BUF_MEM_new()) == NULL)
 201                                         {
 202                                         ret= -1;
 203                                         goto end;
 204                                         }
 205                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 s->init_buf=buf;
 211                                 }
 212
 213                         if (!ssl3_setup_buffers(s))
 214                                 {
 215                                 ret= -1;
 216                                 goto end;
 217                                 }
 218
 219                         s->init_num=0;
 220
 221                         if (s->state != SSL_ST_RENEGOTIATE)
 222                                 {
 223                                 /* Ok, we now need to push on a buffering BIO so that
 224                                  * the output is sent in a way that TCP likes :-)
 225                                  */
 226                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 227
 228                                 ssl3_init_finished_mac(s);
 229                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 230                                 s->ctx->stats.sess_accept++;
 231                                 }
 232                         else
 233                                 {
 234                                 /* s->state == SSL_ST_RENEGOTIATE,
 235                                  * we will just send a HelloRequest */
 236                                 s->ctx->stats.sess_accept_renegotiate++;
 237                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 238                                 }
 239
 240                         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                                 goto end;
 282                                 }
 283
 284                         break;
 285
 286                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 287                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 288
 289                         dtls1_start_timer(s);
 290                         ret = dtls1_send_hello_verify_request(s);
 291                         if ( ret <= 0) goto end;
 292                         s->state=SSL3_ST_SW_FLUSH;
 293                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 294
 295                         /* HelloVerifyRequest resets Finished MAC */
 296                         if (s->version != DTLS1_BAD_VER)
 297                                 ssl3_init_finished_mac(s);
 298                         break;
 299
 300                 case SSL3_ST_SW_SRVR_HELLO_A:
 301                 case SSL3_ST_SW_SRVR_HELLO_B:
 302                         s->new_session = 2;
 303                         dtls1_start_timer(s);
 304                         ret=dtls1_send_server_hello(s);
 305                         if (ret <= 0) goto end;
 306
 307 #ifndef OPENSSL_NO_TLSEXT
 308                         if (s->hit)
 309                                 {
 310                                 if (s->tlsext_ticket_expected)
 311                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 312                                 else
 313                                         s->state=SSL3_ST_SW_CHANGE_A;
 314                                 }
 315 #else
 316                         if (s->hit)
 317                                         s->state=SSL3_ST_SW_CHANGE_A;
 318 #endif
 319                         else
 320                                 s->state=SSL3_ST_SW_CERT_A;
 321                         s->init_num=0;
 322                         break;
 323
 324                 case SSL3_ST_SW_CERT_A:
 325                 case SSL3_ST_SW_CERT_B:
 326                         /* Check if it is anon DH or normal PSK */
 327                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 328                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 329                                 {
 330                                 dtls1_start_timer(s);
 331                                 ret=dtls1_send_server_certificate(s);
 332                                 if (ret <= 0) goto end;
 333 #ifndef OPENSSL_NO_TLSEXT
 334                                 if (s->tlsext_status_expected)
 335                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 336                                 else
 337                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 338                                 }
 339                         else
 340                                 {
 341                                 skip = 1;
 342                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 343                                 }
 344 #else
 345                                 }
 346                         else
 347                                 skip=1;
 348
 349                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 350 #endif
 351                         s->init_num=0;
 352                         break;
 353
 354                 case SSL3_ST_SW_KEY_EXCH_A:
 355                 case SSL3_ST_SW_KEY_EXCH_B:
 356                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 357
 358                         /* clear this, it may get reset by
 359                          * send_server_key_exchange */
 360                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 361 #ifndef OPENSSL_NO_KRB5
 362                                 && !(alg_k & SSL_kKRB5)
 363 #endif /* OPENSSL_NO_KRB5 */
 364                                 )
 365                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 366                                  * even when forbidden by protocol specs
 367                                  * (handshake may fail as clients are not required to
 368                                  * be able to handle this) */
 369                                 s->s3->tmp.use_rsa_tmp=1;
 370                         else
 371                                 s->s3->tmp.use_rsa_tmp=0;
 372
 373                         /* only send if a DH key exchange or
 374                          * RSA but we have a sign only certificate */
 375                         if (s->s3->tmp.use_rsa_tmp
 376                         /* PSK: send ServerKeyExchange if PSK identity
 377                          * hint if provided */
 378 #ifndef OPENSSL_NO_PSK
 379                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 380 #endif
 381                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 382                             || (alg_k & SSL_kEECDH)
 383                             || ((alg_k & SSL_kRSA)
 384                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 385                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 386                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 387                                         )
 388                                     )
 389                                 )
 390                             )
 391                                 {
 392                                 dtls1_start_timer(s);
 393                                 ret=dtls1_send_server_key_exchange(s);
 394                                 if (ret <= 0) goto end;
 395                                 }
 396                         else
 397                                 skip=1;
 398
 399                         s->state=SSL3_ST_SW_CERT_REQ_A;
 400                         s->init_num=0;
 401                         break;
 402
 403                 case SSL3_ST_SW_CERT_REQ_A:
 404                 case SSL3_ST_SW_CERT_REQ_B:
 405                         if (/* don't request cert unless asked for it: */
 406                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 407                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 408                                  * don't request cert during re-negotiation: */
 409                                 ((s->session->peer != NULL) &&
 410                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 411                                 /* never request cert in anonymous ciphersuites
 412                                  * (see section "Certificate request" in SSL 3 drafts
 413                                  * and in RFC 2246): */
 414                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 415                                  /* ... except when the application insists on verification
 416                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 417                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 418                                  /* never request cert in Kerberos ciphersuites */
 419                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 420                                 /* With normal PSK Certificates and
 421                                  * Certificate Requests are omitted */
 422                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 423                                 {
 424                                 /* no cert request */
 425                                 skip=1;
 426                                 s->s3->tmp.cert_request=0;
 427                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 428                                 }
 429                         else
 430                                 {
 431                                 s->s3->tmp.cert_request=1;
 432                                 dtls1_start_timer(s);
 433                                 ret=dtls1_send_certificate_request(s);
 434                                 if (ret <= 0) goto end;
 435 #ifndef NETSCAPE_HANG_BUG
 436                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 437 #else
 438                                 s->state=SSL3_ST_SW_FLUSH;
 439                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 440 #endif
 441                                 s->init_num=0;
 442                                 }
 443                         break;
 444
 445                 case SSL3_ST_SW_SRVR_DONE_A:
 446                 case SSL3_ST_SW_SRVR_DONE_B:
 447                         dtls1_start_timer(s);
 448                         ret=dtls1_send_server_done(s);
 449                         if (ret <= 0) goto end;
 450                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 451                         s->state=SSL3_ST_SW_FLUSH;
 452                         s->init_num=0;
 453                         break;
 454
 455                 case SSL3_ST_SW_FLUSH:
 456                         s->rwstate=SSL_WRITING;
 457                         if (BIO_flush(s->wbio) <= 0)
 458                                 {
 459                                 ret= -1;
 460                                 goto end;
 461                                 }
 462                         s->rwstate=SSL_NOTHING;
 463                         s->state=s->s3->tmp.next_state;
 464                         break;
 465
 466                 case SSL3_ST_SR_CERT_A:
 467                 case SSL3_ST_SR_CERT_B:
 468                         /* Check for second client hello (MS SGC) */
 469                         ret = ssl3_check_client_hello(s);
 470                         if (ret <= 0)
 471                                 goto end;
 472                         dtls1_stop_timer(s);
 473                         if (ret == 2)
 474                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 475                         else {
 476                                 /* could be sent for a DH cert, even if we
 477                                  * have not asked for it :-) */
 478                                 ret=ssl3_get_client_certificate(s);
 479                                 if (ret <= 0) goto end;
 480                                 dtls1_stop_timer(s);
 481                                 s->init_num=0;
 482                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 483                         }
 484                         break;
 485
 486                 case SSL3_ST_SR_KEY_EXCH_A:
 487                 case SSL3_ST_SR_KEY_EXCH_B:
 488                         ret=ssl3_get_client_key_exchange(s);
 489                         if (ret <= 0) goto end;
 490                         dtls1_stop_timer(s);
 491                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 492                         s->init_num=0;
 493
 494                         if (ret == 2)
 495                                 {
 496                                 /* For the ECDH ciphersuites when
 497                                  * the client sends its ECDH pub key in
 498                                  * a certificate, the CertificateVerify
 499                                  * message is not sent.
 500                                  */
 501                                 s->state=SSL3_ST_SR_FINISHED_A;
 502                                 s->init_num = 0;
 503                                 }
 504                         else
 505                                 {
 506                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 507                                 s->init_num=0;
 508
 509                                 /* We need to get hashes here so if there is
 510                                  * a client cert, it can be verified */
 511                                 s->method->ssl3_enc->cert_verify_mac(s,
 512                                         NID_md5,
 513                                         &(s->s3->tmp.cert_verify_md[0]));
 514                                 s->method->ssl3_enc->cert_verify_mac(s,
 515                                         NID_sha1,
 516                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 517                                 }
 518                         break;
 519
 520                 case SSL3_ST_SR_CERT_VRFY_A:
 521                 case SSL3_ST_SR_CERT_VRFY_B:
 522
 523                         s->d1->change_cipher_spec_ok = 1;
 524                         /* we should decide if we expected this one */
 525                         ret=ssl3_get_cert_verify(s);
 526                         if (ret <= 0) goto end;
 527                         dtls1_stop_timer(s);
 528
 529                         s->state=SSL3_ST_SR_FINISHED_A;
 530                         s->init_num=0;
 531                         break;
 532
 533                 case SSL3_ST_SR_FINISHED_A:
 534                 case SSL3_ST_SR_FINISHED_B:
 535                         s->d1->change_cipher_spec_ok = 1;
 536                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 537                                 SSL3_ST_SR_FINISHED_B);
 538                         if (ret <= 0) goto end;
 539                         dtls1_stop_timer(s);
 540                         if (s->hit)
 541                                 s->state=SSL_ST_OK;
 542 #ifndef OPENSSL_NO_TLSEXT
 543                         else if (s->tlsext_ticket_expected)
 544                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 545 #endif
 546                         else
 547                                 s->state=SSL3_ST_SW_CHANGE_A;
 548                         s->init_num=0;
 549                         break;
 550
 551 #ifndef OPENSSL_NO_TLSEXT
 552                 case SSL3_ST_SW_SESSION_TICKET_A:
 553                 case SSL3_ST_SW_SESSION_TICKET_B:
 554                         ret=dtls1_send_newsession_ticket(s);
 555                         if (ret <= 0) goto end;
 556                         s->state=SSL3_ST_SW_CHANGE_A;
 557                         s->init_num=0;
 558                         break;
 559
 560                 case SSL3_ST_SW_CERT_STATUS_A:
 561                 case SSL3_ST_SW_CERT_STATUS_B:
 562                         ret=ssl3_send_cert_status(s);
 563                         if (ret <= 0) goto end;
 564                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 565                         s->init_num=0;
 566                         break;
 567
 568 #endif
 569
 570                 case SSL3_ST_SW_CHANGE_A:
 571                 case SSL3_ST_SW_CHANGE_B:
 572
 573                         s->session->cipher=s->s3->tmp.new_cipher;
 574                         if (!s->method->ssl3_enc->setup_key_block(s))
 575                                 { ret= -1; goto end; }
 576
 577                         ret=dtls1_send_change_cipher_spec(s,
 578                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 579
 580                         if (ret <= 0) goto end;
 581                         s->state=SSL3_ST_SW_FINISHED_A;
 582                         s->init_num=0;
 583
 584                         if (!s->method->ssl3_enc->change_cipher_state(s,
 585                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 586                                 {
 587                                 ret= -1;
 588                                 goto end;
 589                                 }
 590
 591                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 592                         break;
 593
 594                 case SSL3_ST_SW_FINISHED_A:
 595                 case SSL3_ST_SW_FINISHED_B:
 596                         ret=dtls1_send_finished(s,
 597                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 598                                 s->method->ssl3_enc->server_finished_label,
 599                                 s->method->ssl3_enc->server_finished_label_len);
 600                         if (ret <= 0) goto end;
 601                         s->state=SSL3_ST_SW_FLUSH;
 602                         if (s->hit)
 603                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 604                         else
 605                                 s->s3->tmp.next_state=SSL_ST_OK;
 606                         s->init_num=0;
 607                         break;
 608
 609                 case SSL_ST_OK:
 610                         /* clean a few things up */
 611                         ssl3_cleanup_key_block(s);
 612
 613 #if 0
 614                         BUF_MEM_free(s->init_buf);
 615                         s->init_buf=NULL;
 616 #endif
 617
 618                         /* remove buffering on output */
 619                         ssl_free_wbio_buffer(s);
 620
 621                         s->init_num=0;
 622
 623                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 624                                 {
 625                                 /* actually not necessarily a 'new' session unless
 626                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 627
 628                                 s->new_session=0;
 629
 630                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 631
 632                                 s->ctx->stats.sess_accept_good++;
 633                                 /* s->server=1; */
 634                                 s->handshake_func=dtls1_accept;
 635
 636                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 637                                 }
 638
 639                         ret = 1;
 640
 641                         /* done handshaking, next message is client hello */
 642                         s->d1->handshake_read_seq = 0;
 643                         /* next message is server hello */
 644                         s->d1->handshake_write_seq = 0;
 645                         s->d1->next_handshake_write_seq = 0;
 646                         goto end;
 647                         /* break; */
 648
 649                 default:
 650                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 651                         ret= -1;
 652                         goto end;
 653                         /* break; */
 654                         }
 655
 656                 if (!s->s3->tmp.reuse_message && !skip)
 657                         {
 658                         if (s->debug)
 659                                 {
 660                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 661                                         goto end;
 662                                 }
 663
 664
 665                         if ((cb != NULL) && (s->state != state))
 666                                 {
 667                                 new_state=s->state;
 668                                 s->state=state;
 669                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 670                                 s->state=new_state;
 671                                 }
 672                         }
 673                 skip=0;
 674                 }
 675 end:
 676         /* BIO_flush(s->wbio); */
 677
 678         s->in_handshake--;
 679         if (cb != NULL)
 680                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 681         return(ret);
 682         }
 683
 684 int dtls1_send_hello_request(SSL *s)
 685         {
 686         unsigned char *p;
 687
 688         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 689                 {
 690                 p=(unsigned char *)s->init_buf->data;
 691                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 692
 693                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 694                 /* number of bytes to write */
 695                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 696                 s->init_off=0;
 697
 698                 /* no need to buffer this message, since there are no retransmit
 699                  * requests for it */
 700                 }
 701
 702         /* SSL3_ST_SW_HELLO_REQ_B */
 703         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 704         }
 705
 706 int dtls1_send_hello_verify_request(SSL *s)
 707         {
 708         unsigned int msg_len;
 709         unsigned char *msg, *buf, *p;
 710
 711         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 712                 {
 713                 buf = (unsigned char *)s->init_buf->data;
 714
 715                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 716                 *(p++) = s->version >> 8;
 717                 *(p++) = s->version & 0xFF;
 718
 719                 if (s->ctx->app_gen_cookie_cb == NULL ||
 720                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 721                          &(s->d1->cookie_len)) == 0)
 722                         {
 723                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 724                         return 0;
 725                         }
 726
 727                 *(p++) = (unsigned char) s->d1->cookie_len;
 728                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 729                 p += s->d1->cookie_len;
 730                 msg_len = p - msg;
 731
 732                 dtls1_set_message_header(s, buf,
 733                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 734
 735                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 736                 /* number of bytes to write */
 737                 s->init_num=p-buf;
 738                 s->init_off=0;
 739
 740                 /* buffer the message to handle re-xmits */
 741                 dtls1_buffer_message(s, 0);
 742                 }
 743
 744         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 745         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 746         }
 747
 748 int dtls1_send_server_hello(SSL *s)
 749         {
 750         unsigned char *buf;
 751         unsigned char *p,*d;
 752         int i;
 753         unsigned int sl;
 754         unsigned long l,Time;
 755
 756         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 757                 {
 758                 buf=(unsigned char *)s->init_buf->data;
 759                 p=s->s3->server_random;
 760                 Time=(unsigned long)time(NULL);                 /* Time */
 761                 l2n(Time,p);
 762                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 763                 /* Do the message type and length last */
 764                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 765
 766                 *(p++)=s->version>>8;
 767                 *(p++)=s->version&0xff;
 768
 769                 /* Random stuff */
 770                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 771                 p+=SSL3_RANDOM_SIZE;
 772
 773                 /* now in theory we have 3 options to sending back the
 774                  * session id.  If it is a re-use, we send back the
 775                  * old session-id, if it is a new session, we send
 776                  * back the new session-id or we send back a 0 length
 777                  * session-id if we want it to be single use.
 778                  * Currently I will not implement the '0' length session-id
 779                  * 12-Jan-98 - I'll now support the '0' length stuff.
 780                  */
 781                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 782                         s->session->session_id_length=0;
 783
 784                 sl=s->session->session_id_length;
 785                 if (sl > sizeof s->session->session_id)
 786                         {
 787                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 788                         return -1;
 789                         }
 790                 *(p++)=sl;
 791                 memcpy(p,s->session->session_id,sl);
 792                 p+=sl;
 793
 794                 /* put the cipher */
 795                 if (s->s3->tmp.new_cipher == NULL)
 796                         return -1;
 797                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 798                 p+=i;
 799
 800                 /* put the compression method */
 801 #ifdef OPENSSL_NO_COMP
 802                 *(p++)=0;
 803 #else
 804                 if (s->s3->tmp.new_compression == NULL)
 805                         *(p++)=0;
 806                 else
 807                         *(p++)=s->s3->tmp.new_compression->id;
 808 #endif
 809
 810 #ifndef OPENSSL_NO_TLSEXT
 811                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 812                         {
 813                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 814                         return -1;
 815                         }
 816 #endif
 817
 818                 /* do the header */
 819                 l=(p-d);
 820                 d=buf;
 821
 822                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 823
 824                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 825                 /* number of bytes to write */
 826                 s->init_num=p-buf;
 827                 s->init_off=0;
 828
 829                 /* buffer the message to handle re-xmits */
 830                 dtls1_buffer_message(s, 0);
 831                 }
 832
 833         /* SSL3_ST_SW_SRVR_HELLO_B */
 834         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 835         }
 836
 837 int dtls1_send_server_done(SSL *s)
 838         {
 839         unsigned char *p;
 840
 841         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 842                 {
 843                 p=(unsigned char *)s->init_buf->data;
 844
 845                 /* do the header */
 846                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 847
 848                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 849                 /* number of bytes to write */
 850                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 851                 s->init_off=0;
 852
 853                 /* buffer the message to handle re-xmits */
 854                 dtls1_buffer_message(s, 0);
 855                 }
 856
 857         /* SSL3_ST_SW_SRVR_DONE_B */
 858         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 859         }
 860
 861 int dtls1_send_server_key_exchange(SSL *s)
 862         {
 863 #ifndef OPENSSL_NO_RSA
 864         unsigned char *q;
 865         int j,num;
 866         RSA *rsa;
 867         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 868         unsigned int u;
 869 #endif
 870 #ifndef OPENSSL_NO_DH
 871         DH *dh=NULL,*dhp;
 872 #endif
 873 #ifndef OPENSSL_NO_ECDH
 874         EC_KEY *ecdh=NULL, *ecdhp;
 875         unsigned char *encodedPoint = NULL;
 876         int encodedlen = 0;
 877         int curve_id = 0;
 878         BN_CTX *bn_ctx = NULL;
 879 #endif
 880         EVP_PKEY *pkey;
 881         unsigned char *p,*d;
 882         int al,i;
 883         unsigned long type;
 884         int n;
 885         CERT *cert;
 886         BIGNUM *r[4];
 887         int nr[4],kn;
 888         BUF_MEM *buf;
 889         EVP_MD_CTX md_ctx;
 890
 891         EVP_MD_CTX_init(&md_ctx);
 892         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 893                 {
 894                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 895                 cert=s->cert;
 896
 897                 buf=s->init_buf;
 898
 899                 r[0]=r[1]=r[2]=r[3]=NULL;
 900                 n=0;
 901 #ifndef OPENSSL_NO_RSA
 902                 if (type & SSL_kRSA)
 903                         {
 904                         rsa=cert->rsa_tmp;
 905                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 906                                 {
 907                                 rsa=s->cert->rsa_tmp_cb(s,
 908                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 909                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 910                                 if(rsa == NULL)
 911                                 {
 912                                         al=SSL_AD_HANDSHAKE_FAILURE;
 913                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 914                                         goto f_err;
 915                                 }
 916                                 RSA_up_ref(rsa);
 917                                 cert->rsa_tmp=rsa;
 918                                 }
 919                         if (rsa == NULL)
 920                                 {
 921                                 al=SSL_AD_HANDSHAKE_FAILURE;
 922                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 923                                 goto f_err;
 924                                 }
 925                         r[0]=rsa->n;
 926                         r[1]=rsa->e;
 927                         s->s3->tmp.use_rsa_tmp=1;
 928                         }
 929                 else
 930 #endif
 931 #ifndef OPENSSL_NO_DH
 932                         if (type & SSL_kEDH)
 933                         {
 934                         dhp=cert->dh_tmp;
 935                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 936                                 dhp=s->cert->dh_tmp_cb(s,
 937                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 938                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 939                         if (dhp == NULL)
 940                                 {
 941                                 al=SSL_AD_HANDSHAKE_FAILURE;
 942                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 943                                 goto f_err;
 944                                 }
 945
 946                         if (s->s3->tmp.dh != NULL)
 947                                 {
 948                                 DH_free(dh);
 949                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 950                                 goto err;
 951                                 }
 952
 953                         if ((dh=DHparams_dup(dhp)) == NULL)
 954                                 {
 955                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 956                                 goto err;
 957                                 }
 958
 959                         s->s3->tmp.dh=dh;
 960                         if ((dhp->pub_key == NULL ||
 961                              dhp->priv_key == NULL ||
 962                              (s->options & SSL_OP_SINGLE_DH_USE)))
 963                                 {
 964                                 if(!DH_generate_key(dh))
 965                                     {
 966                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 967                                            ERR_R_DH_LIB);
 968                                     goto err;
 969                                     }
 970                                 }
 971                         else
 972                                 {
 973                                 dh->pub_key=BN_dup(dhp->pub_key);
 974                                 dh->priv_key=BN_dup(dhp->priv_key);
 975                                 if ((dh->pub_key == NULL) ||
 976                                         (dh->priv_key == NULL))
 977                                         {
 978                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 979                                         goto err;
 980                                         }
 981                                 }
 982                         r[0]=dh->p;
 983                         r[1]=dh->g;
 984                         r[2]=dh->pub_key;
 985                         }
 986                 else
 987 #endif
 988 #ifndef OPENSSL_NO_ECDH
 989                         if (type & SSL_kEECDH)
 990                         {
 991                         const EC_GROUP *group;
 992
 993                         ecdhp=cert->ecdh_tmp;
 994                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
 995                                 {
 996                                 ecdhp=s->cert->ecdh_tmp_cb(s,
 997                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 998                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 999                                 }
1000                         if (ecdhp == NULL)
1001                                 {
1002                                 al=SSL_AD_HANDSHAKE_FAILURE;
1003                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1004                                 goto f_err;
1005                                 }
1006
1007                         if (s->s3->tmp.ecdh != NULL)
1008                                 {
1009                                 EC_KEY_free(s->s3->tmp.ecdh);
1010                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1011                                 goto err;
1012                                 }
1013
1014                         /* Duplicate the ECDH structure. */
1015                         if (ecdhp == NULL)
1016                                 {
1017                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1018                                 goto err;
1019                                 }
1020                         if (!EC_KEY_up_ref(ecdhp))
1021                                 {
1022                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1023                                 goto err;
1024                                 }
1025                         ecdh = ecdhp;
1026
1027                         s->s3->tmp.ecdh=ecdh;
1028                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1029                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1030                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1031                                 {
1032                                 if(!EC_KEY_generate_key(ecdh))
1033                                     {
1034                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1035                                     goto err;
1036                                     }
1037                                 }
1038
1039                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1040                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1041                             (EC_KEY_get0_private_key(ecdh) == NULL))
1042                                 {
1043                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1044                                 goto err;
1045                                 }
1046
1047                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1048                             (EC_GROUP_get_degree(group) > 163))
1049                                 {
1050                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1051                                 goto err;
1052                                 }
1053
1054                         /* XXX: For now, we only support ephemeral ECDH
1055                          * keys over named (not generic) curves. For
1056                          * supported named curves, curve_id is non-zero.
1057                          */
1058                         if ((curve_id =
1059                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1060                             == 0)
1061                                 {
1062                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1063                                 goto err;
1064                                 }
1065
1066                         /* Encode the public key.
1067                          * First check the size of encoding and
1068                          * allocate memory accordingly.
1069                          */
1070                         encodedlen = EC_POINT_point2oct(group,
1071                             EC_KEY_get0_public_key(ecdh),
1072                             POINT_CONVERSION_UNCOMPRESSED,
1073                             NULL, 0, NULL);
1074
1075                         encodedPoint = (unsigned char *)
1076                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1077                         bn_ctx = BN_CTX_new();
1078                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1079                                 {
1080                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1081                                 goto err;
1082                                 }
1083
1084
1085                         encodedlen = EC_POINT_point2oct(group,
1086                             EC_KEY_get0_public_key(ecdh),
1087                             POINT_CONVERSION_UNCOMPRESSED,
1088                             encodedPoint, encodedlen, bn_ctx);
1089
1090                         if (encodedlen == 0)
1091                                 {
1092                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1093                                 goto err;
1094                                 }
1095
1096                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1097
1098                         /* XXX: For now, we only support named (not
1099                          * generic) curves in ECDH ephemeral key exchanges.
1100                          * In this situation, we need four additional bytes
1101                          * to encode the entire ServerECDHParams
1102                          * structure.
1103                          */
1104                         n = 4 + encodedlen;
1105
1106                         /* We'll generate the serverKeyExchange message
1107                          * explicitly so we can set these to NULLs
1108                          */
1109                         r[0]=NULL;
1110                         r[1]=NULL;
1111                         r[2]=NULL;
1112                         r[3]=NULL;
1113                         }
1114                 else
1115 #endif /* !OPENSSL_NO_ECDH */
1116 #ifndef OPENSSL_NO_PSK
1117                         if (type & SSL_kPSK)
1118                                 {
1119                                 /* reserve size for record length and PSK identity hint*/
1120                                 n+=2+strlen(s->ctx->psk_identity_hint);
1121                                 }
1122                         else
1123 #endif /* !OPENSSL_NO_PSK */
1124                         {
1125                         al=SSL_AD_HANDSHAKE_FAILURE;
1126                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1127                         goto f_err;
1128                         }
1129                 for (i=0; r[i] != NULL; i++)
1130                         {
1131                         nr[i]=BN_num_bytes(r[i]);
1132                         n+=2+nr[i];
1133                         }
1134
1135                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1136                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1137                         {
1138                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1139                                 == NULL)
1140                                 {
1141                                 al=SSL_AD_DECODE_ERROR;
1142                                 goto f_err;
1143                                 }
1144                         kn=EVP_PKEY_size(pkey);
1145                         }
1146                 else
1147                         {
1148                         pkey=NULL;
1149                         kn=0;
1150                         }
1151
1152                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1153                         {
1154                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1155                         goto err;
1156                         }
1157                 d=(unsigned char *)s->init_buf->data;
1158                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1159
1160                 for (i=0; r[i] != NULL; i++)
1161                         {
1162                         s2n(nr[i],p);
1163                         BN_bn2bin(r[i],p);
1164                         p+=nr[i];
1165                         }
1166
1167 #ifndef OPENSSL_NO_ECDH
1168                 if (type & SSL_kEECDH)
1169                         {
1170                         /* XXX: For now, we only support named (not generic) curves.
1171                          * In this situation, the serverKeyExchange message has:
1172                          * [1 byte CurveType], [2 byte CurveName]
1173                          * [1 byte length of encoded point], followed by
1174                          * the actual encoded point itself
1175                          */
1176                         *p = NAMED_CURVE_TYPE;
1177                         p += 1;
1178                         *p = 0;
1179                         p += 1;
1180                         *p = curve_id;
1181                         p += 1;
1182                         *p = encodedlen;
1183                         p += 1;
1184                         memcpy((unsigned char*)p,
1185                             (unsigned char *)encodedPoint,
1186                             encodedlen);
1187                         OPENSSL_free(encodedPoint);
1188                         p += encodedlen;
1189                         }
1190 #endif
1191
1192 #ifndef OPENSSL_NO_PSK
1193                 if (type & SSL_kPSK)
1194                         {
1195                         /* copy PSK identity hint */
1196                         s2n(strlen(s->ctx->psk_identity_hint), p);
1197                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1198                         p+=strlen(s->ctx->psk_identity_hint);
1199                         }
1200 #endif
1201
1202                 /* not anonymous */
1203                 if (pkey != NULL)
1204                         {
1205                         /* n is the length of the params, they start at
1206                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1207                          * at the end. */
1208 #ifndef OPENSSL_NO_RSA
1209                         if (pkey->type == EVP_PKEY_RSA)
1210                                 {
1211                                 q=md_buf;
1212                                 j=0;
1213                                 for (num=2; num > 0; num--)
1214                                         {
1215                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1216                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1217                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1218                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1219                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1220                                         EVP_DigestFinal_ex(&md_ctx,q,
1221                                                 (unsigned int *)&i);
1222                                         q+=i;
1223                                         j+=i;
1224                                         }
1225                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1226                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1227                                         {
1228                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1229                                         goto err;
1230                                         }
1231                                 s2n(u,p);
1232                                 n+=u+2;
1233                                 }
1234                         else
1235 #endif
1236 #if !defined(OPENSSL_NO_DSA)
1237                                 if (pkey->type == EVP_PKEY_DSA)
1238                                 {
1239                                 /* lets do DSS */
1240                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1241                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1242                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1243                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1244                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1245                                         (unsigned int *)&i,pkey))
1246                                         {
1247                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1248                                         goto err;
1249                                         }
1250                                 s2n(i,p);
1251                                 n+=i+2;
1252                                 }
1253                         else
1254 #endif
1255 #if !defined(OPENSSL_NO_ECDSA)
1256                                 if (pkey->type == EVP_PKEY_EC)
1257                                 {
1258                                 /* let's do ECDSA */
1259                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1260                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1261                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1262                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1263                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1264                                         (unsigned int *)&i,pkey))
1265                                         {
1266                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1267                                         goto err;
1268                                         }
1269                                 s2n(i,p);
1270                                 n+=i+2;
1271                                 }
1272                         else
1273 #endif
1274                                 {
1275                                 /* Is this error check actually needed? */
1276                                 al=SSL_AD_HANDSHAKE_FAILURE;
1277                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1278                                 goto f_err;
1279                                 }
1280                         }
1281
1282                 d = dtls1_set_message_header(s, d,
1283                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1284
1285                 /* we should now have things packed up, so lets send
1286                  * it off */
1287                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1288                 s->init_off=0;
1289
1290                 /* buffer the message to handle re-xmits */
1291                 dtls1_buffer_message(s, 0);
1292                 }
1293
1294         s->state = SSL3_ST_SW_KEY_EXCH_B;
1295         EVP_MD_CTX_cleanup(&md_ctx);
1296         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1297 f_err:
1298         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1299 err:
1300 #ifndef OPENSSL_NO_ECDH
1301         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1302         BN_CTX_free(bn_ctx);
1303 #endif
1304         EVP_MD_CTX_cleanup(&md_ctx);
1305         return(-1);
1306         }
1307
1308 int dtls1_send_certificate_request(SSL *s)
1309         {
1310         unsigned char *p,*d;
1311         int i,j,nl,off,n;
1312         STACK_OF(X509_NAME) *sk=NULL;
1313         X509_NAME *name;
1314         BUF_MEM *buf;
1315         unsigned int msg_len;
1316
1317         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1318                 {
1319                 buf=s->init_buf;
1320
1321                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1322
1323                 /* get the list of acceptable cert types */
1324                 p++;
1325                 n=ssl3_get_req_cert_type(s,p);
1326                 d[0]=n;
1327                 p+=n;
1328                 n++;
1329
1330                 off=n;
1331                 p+=2;
1332                 n+=2;
1333
1334                 sk=SSL_get_client_CA_list(s);
1335                 nl=0;
1336                 if (sk != NULL)
1337                         {
1338                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1339                                 {
1340                                 name=sk_X509_NAME_value(sk,i);
1341                                 j=i2d_X509_NAME(name,NULL);
1342                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1343                                         {
1344                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1345                                         goto err;
1346                                         }
1347                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1348                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1349                                         {
1350                                         s2n(j,p);
1351                                         i2d_X509_NAME(name,&p);
1352                                         n+=2+j;
1353                                         nl+=2+j;
1354                                         }
1355                                 else
1356                                         {
1357                                         d=p;
1358                                         i2d_X509_NAME(name,&p);
1359                                         j-=2; s2n(j,d); j+=2;
1360                                         n+=j;
1361                                         nl+=j;
1362                                         }
1363                                 }
1364                         }
1365                 /* else no CA names */
1366                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1367                 s2n(nl,p);
1368
1369                 d=(unsigned char *)buf->data;
1370                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1371                 l2n3(n,d);
1372                 s2n(s->d1->handshake_write_seq,d);
1373                 s->d1->handshake_write_seq++;
1374
1375                 /* we should now have things packed up, so lets send
1376                  * it off */
1377
1378                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1379                 s->init_off=0;
1380 #ifdef NETSCAPE_HANG_BUG
1381 /* XXX: what to do about this? */
1382                 p=(unsigned char *)s->init_buf->data + s->init_num;
1383
1384                 /* do the header */
1385                 *(p++)=SSL3_MT_SERVER_DONE;
1386                 *(p++)=0;
1387                 *(p++)=0;
1388                 *(p++)=0;
1389                 s->init_num += 4;
1390 #endif
1391
1392                 /* XDTLS:  set message header ? */
1393                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1394                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1395                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1396
1397                 /* buffer the message to handle re-xmits */
1398                 dtls1_buffer_message(s, 0);
1399
1400                 s->state = SSL3_ST_SW_CERT_REQ_B;
1401                 }
1402
1403         /* SSL3_ST_SW_CERT_REQ_B */
1404         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1405 err:
1406         return(-1);
1407         }
1408
1409 int dtls1_send_server_certificate(SSL *s)
1410         {
1411         unsigned long l;
1412         X509 *x;
1413
1414         if (s->state == SSL3_ST_SW_CERT_A)
1415                 {
1416                 x=ssl_get_server_send_cert(s);
1417                 if (x == NULL)
1418                         {
1419                         /* VRS: allow null cert if auth == KRB5 */
1420                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1421                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1422                                 {
1423                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1424                                 return(0);
1425                                 }
1426                         }
1427
1428                 l=dtls1_output_cert_chain(s,x);
1429                 s->state=SSL3_ST_SW_CERT_B;
1430                 s->init_num=(int)l;
1431                 s->init_off=0;
1432
1433                 /* buffer the message to handle re-xmits */
1434                 dtls1_buffer_message(s, 0);
1435                 }
1436
1437         /* SSL3_ST_SW_CERT_B */
1438         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1439         }
1440
1441 #ifndef OPENSSL_NO_TLSEXT
1442 int dtls1_send_newsession_ticket(SSL *s)
1443         {
1444         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1445                 {
1446                 unsigned char *p, *senc, *macstart;
1447                 int len, slen;
1448                 unsigned int hlen, msg_len;
1449                 EVP_CIPHER_CTX ctx;
1450                 HMAC_CTX hctx;
1451                 SSL_CTX *tctx = s->initial_ctx;
1452                 unsigned char iv[EVP_MAX_IV_LENGTH];
1453                 unsigned char key_name[16];
1454
1455                 /* get session encoding length */
1456                 slen = i2d_SSL_SESSION(s->session, NULL);
1457                 /* Some length values are 16 bits, so forget it if session is
1458                  * too long
1459                  */
1460                 if (slen > 0xFF00)
1461                         return -1;
1462                 /* Grow buffer if need be: the length calculation is as
1463                  * follows 12 (DTLS handshake message header) +
1464                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1465                  * 16 (key name) + max_iv_len (iv length) +
1466                  * session_length + max_enc_block_size (max encrypted session
1467                  * length) + max_md_size (HMAC).
1468                  */
1469                 if (!BUF_MEM_grow(s->init_buf,
1470                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1471                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1472                         return -1;
1473                 senc = OPENSSL_malloc(slen);
1474                 if (!senc)
1475                         return -1;
1476                 p = senc;
1477                 i2d_SSL_SESSION(s->session, &p);
1478
1479                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1480                 EVP_CIPHER_CTX_init(&ctx);
1481                 HMAC_CTX_init(&hctx);
1482                 /* Initialize HMAC and cipher contexts. If callback present
1483                  * it does all the work otherwise use generated values
1484                  * from parent ctx.
1485                  */
1486                 if (tctx->tlsext_ticket_key_cb)
1487                         {
1488                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1489                                                          &hctx, 1) < 0)
1490                                 {
1491                                 OPENSSL_free(senc);
1492                                 return -1;
1493                                 }
1494                         }
1495                 else
1496                         {
1497                         RAND_pseudo_bytes(iv, 16);
1498                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1499                                         tctx->tlsext_tick_aes_key, iv);
1500                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1501                                         tlsext_tick_md(), NULL);
1502                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1503                         }
1504                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1505                 /* Skip ticket length for now */
1506                 p += 2;
1507                 /* Output key name */
1508                 macstart = p;
1509                 memcpy(p, key_name, 16);
1510                 p += 16;
1511                 /* output IV */
1512                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1513                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1514                 /* Encrypt session data */
1515                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1516                 p += len;
1517                 EVP_EncryptFinal(&ctx, p, &len);
1518                 p += len;
1519                 EVP_CIPHER_CTX_cleanup(&ctx);
1520
1521                 HMAC_Update(&hctx, macstart, p - macstart);
1522                 HMAC_Final(&hctx, p, &hlen);
1523                 HMAC_CTX_cleanup(&hctx);
1524
1525                 p += hlen;
1526                 /* Now write out lengths: p points to end of data written */
1527                 /* Total length */
1528                 len = p - (unsigned char *)(s->init_buf->data);
1529                 /* Ticket length */
1530                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1531                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1532
1533                 /* number of bytes to write */
1534                 s->init_num= len;
1535                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1536                 s->init_off=0;
1537                 OPENSSL_free(senc);
1538
1539                 /* XDTLS:  set message header ? */
1540                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1541                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1542                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1543
1544                 /* buffer the message to handle re-xmits */
1545                 dtls1_buffer_message(s, 0);
1546                 }
1547
1548         /* SSL3_ST_SW_SESSION_TICKET_B */
1549         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1550         }
1551 #endif