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                                 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->renegotiate = 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->renegotiate == 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->renegotiate=0;
 629                                 s->new_session=0;
 630
 631                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 632
 633                                 s->ctx->stats.sess_accept_good++;
 634                                 /* s->server=1; */
 635                                 s->handshake_func=dtls1_accept;
 636
 637                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 638                                 }
 639
 640                         ret = 1;
 641
 642                         /* done handshaking, next message is client hello */
 643                         s->d1->handshake_read_seq = 0;
 644                         /* next message is server hello */
 645                         s->d1->handshake_write_seq = 0;
 646                         s->d1->next_handshake_write_seq = 0;
 647                         goto end;
 648                         /* break; */
 649
 650                 default:
 651                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 652                         ret= -1;
 653                         goto end;
 654                         /* break; */
 655                         }
 656
 657                 if (!s->s3->tmp.reuse_message && !skip)
 658                         {
 659                         if (s->debug)
 660                                 {
 661                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 662                                         goto end;
 663                                 }
 664
 665
 666                         if ((cb != NULL) && (s->state != state))
 667                                 {
 668                                 new_state=s->state;
 669                                 s->state=state;
 670                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 671                                 s->state=new_state;
 672                                 }
 673                         }
 674                 skip=0;
 675                 }
 676 end:
 677         /* BIO_flush(s->wbio); */
 678
 679         s->in_handshake--;
 680         if (cb != NULL)
 681                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 682         return(ret);
 683         }
 684
 685 int dtls1_send_hello_request(SSL *s)
 686         {
 687         unsigned char *p;
 688
 689         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 690                 {
 691                 p=(unsigned char *)s->init_buf->data;
 692                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 693
 694                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 695                 /* number of bytes to write */
 696                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 697                 s->init_off=0;
 698
 699                 /* no need to buffer this message, since there are no retransmit
 700                  * requests for it */
 701                 }
 702
 703         /* SSL3_ST_SW_HELLO_REQ_B */
 704         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 705         }
 706
 707 int dtls1_send_hello_verify_request(SSL *s)
 708         {
 709         unsigned int msg_len;
 710         unsigned char *msg, *buf, *p;
 711
 712         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 713                 {
 714                 buf = (unsigned char *)s->init_buf->data;
 715
 716                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 717                 *(p++) = s->version >> 8;
 718                 *(p++) = s->version & 0xFF;
 719
 720                 if (s->ctx->app_gen_cookie_cb == NULL ||
 721                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 722                          &(s->d1->cookie_len)) == 0)
 723                         {
 724                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 725                         return 0;
 726                         }
 727
 728                 *(p++) = (unsigned char) s->d1->cookie_len;
 729                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 730                 p += s->d1->cookie_len;
 731                 msg_len = p - msg;
 732
 733                 dtls1_set_message_header(s, buf,
 734                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 735
 736                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 737                 /* number of bytes to write */
 738                 s->init_num=p-buf;
 739                 s->init_off=0;
 740
 741                 /* buffer the message to handle re-xmits */
 742                 dtls1_buffer_message(s, 0);
 743                 }
 744
 745         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 746         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 747         }
 748
 749 int dtls1_send_server_hello(SSL *s)
 750         {
 751         unsigned char *buf;
 752         unsigned char *p,*d;
 753         int i;
 754         unsigned int sl;
 755         unsigned long l,Time;
 756
 757         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 758                 {
 759                 buf=(unsigned char *)s->init_buf->data;
 760                 p=s->s3->server_random;
 761                 Time=(unsigned long)time(NULL);                 /* Time */
 762                 l2n(Time,p);
 763                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 764                 /* Do the message type and length last */
 765                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 766
 767                 *(p++)=s->version>>8;
 768                 *(p++)=s->version&0xff;
 769
 770                 /* Random stuff */
 771                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 772                 p+=SSL3_RANDOM_SIZE;
 773
 774                 /* now in theory we have 3 options to sending back the
 775                  * session id.  If it is a re-use, we send back the
 776                  * old session-id, if it is a new session, we send
 777                  * back the new session-id or we send back a 0 length
 778                  * session-id if we want it to be single use.
 779                  * Currently I will not implement the '0' length session-id
 780                  * 12-Jan-98 - I'll now support the '0' length stuff.
 781                  */
 782                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 783                         s->session->session_id_length=0;
 784
 785                 sl=s->session->session_id_length;
 786                 if (sl > sizeof s->session->session_id)
 787                         {
 788                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 789                         return -1;
 790                         }
 791                 *(p++)=sl;
 792                 memcpy(p,s->session->session_id,sl);
 793                 p+=sl;
 794
 795                 /* put the cipher */
 796                 if (s->s3->tmp.new_cipher == NULL)
 797                         return -1;
 798                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 799                 p+=i;
 800
 801                 /* put the compression method */
 802 #ifdef OPENSSL_NO_COMP
 803                 *(p++)=0;
 804 #else
 805                 if (s->s3->tmp.new_compression == NULL)
 806                         *(p++)=0;
 807                 else
 808                         *(p++)=s->s3->tmp.new_compression->id;
 809 #endif
 810
 811 #ifndef OPENSSL_NO_TLSEXT
 812                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 813                         {
 814                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 815                         return -1;
 816                         }
 817 #endif
 818
 819                 /* do the header */
 820                 l=(p-d);
 821                 d=buf;
 822
 823                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 824
 825                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 826                 /* number of bytes to write */
 827                 s->init_num=p-buf;
 828                 s->init_off=0;
 829
 830                 /* buffer the message to handle re-xmits */
 831                 dtls1_buffer_message(s, 0);
 832                 }
 833
 834         /* SSL3_ST_SW_SRVR_HELLO_B */
 835         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 836         }
 837
 838 int dtls1_send_server_done(SSL *s)
 839         {
 840         unsigned char *p;
 841
 842         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 843                 {
 844                 p=(unsigned char *)s->init_buf->data;
 845
 846                 /* do the header */
 847                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 848
 849                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 850                 /* number of bytes to write */
 851                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 852                 s->init_off=0;
 853
 854                 /* buffer the message to handle re-xmits */
 855                 dtls1_buffer_message(s, 0);
 856                 }
 857
 858         /* SSL3_ST_SW_SRVR_DONE_B */
 859         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 860         }
 861
 862 int dtls1_send_server_key_exchange(SSL *s)
 863         {
 864 #ifndef OPENSSL_NO_RSA
 865         unsigned char *q;
 866         int j,num;
 867         RSA *rsa;
 868         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 869         unsigned int u;
 870 #endif
 871 #ifndef OPENSSL_NO_DH
 872         DH *dh=NULL,*dhp;
 873 #endif
 874 #ifndef OPENSSL_NO_ECDH
 875         EC_KEY *ecdh=NULL, *ecdhp;
 876         unsigned char *encodedPoint = NULL;
 877         int encodedlen = 0;
 878         int curve_id = 0;
 879         BN_CTX *bn_ctx = NULL;
 880 #endif
 881         EVP_PKEY *pkey;
 882         unsigned char *p,*d;
 883         int al,i;
 884         unsigned long type;
 885         int n;
 886         CERT *cert;
 887         BIGNUM *r[4];
 888         int nr[4],kn;
 889         BUF_MEM *buf;
 890         EVP_MD_CTX md_ctx;
 891
 892         EVP_MD_CTX_init(&md_ctx);
 893         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 894                 {
 895                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 896                 cert=s->cert;
 897
 898                 buf=s->init_buf;
 899
 900                 r[0]=r[1]=r[2]=r[3]=NULL;
 901                 n=0;
 902 #ifndef OPENSSL_NO_RSA
 903                 if (type & SSL_kRSA)
 904                         {
 905                         rsa=cert->rsa_tmp;
 906                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 907                                 {
 908                                 rsa=s->cert->rsa_tmp_cb(s,
 909                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 910                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 911                                 if(rsa == NULL)
 912                                 {
 913                                         al=SSL_AD_HANDSHAKE_FAILURE;
 914                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 915                                         goto f_err;
 916                                 }
 917                                 RSA_up_ref(rsa);
 918                                 cert->rsa_tmp=rsa;
 919                                 }
 920                         if (rsa == NULL)
 921                                 {
 922                                 al=SSL_AD_HANDSHAKE_FAILURE;
 923                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 924                                 goto f_err;
 925                                 }
 926                         r[0]=rsa->n;
 927                         r[1]=rsa->e;
 928                         s->s3->tmp.use_rsa_tmp=1;
 929                         }
 930                 else
 931 #endif
 932 #ifndef OPENSSL_NO_DH
 933                         if (type & SSL_kEDH)
 934                         {
 935                         dhp=cert->dh_tmp;
 936                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 937                                 dhp=s->cert->dh_tmp_cb(s,
 938                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 939                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 940                         if (dhp == NULL)
 941                                 {
 942                                 al=SSL_AD_HANDSHAKE_FAILURE;
 943                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 944                                 goto f_err;
 945                                 }
 946
 947                         if (s->s3->tmp.dh != NULL)
 948                                 {
 949                                 DH_free(dh);
 950                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 951                                 goto err;
 952                                 }
 953
 954                         if ((dh=DHparams_dup(dhp)) == NULL)
 955                                 {
 956                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 957                                 goto err;
 958                                 }
 959
 960                         s->s3->tmp.dh=dh;
 961                         if ((dhp->pub_key == NULL ||
 962                              dhp->priv_key == NULL ||
 963                              (s->options & SSL_OP_SINGLE_DH_USE)))
 964                                 {
 965                                 if(!DH_generate_key(dh))
 966                                     {
 967                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 968                                            ERR_R_DH_LIB);
 969                                     goto err;
 970                                     }
 971                                 }
 972                         else
 973                                 {
 974                                 dh->pub_key=BN_dup(dhp->pub_key);
 975                                 dh->priv_key=BN_dup(dhp->priv_key);
 976                                 if ((dh->pub_key == NULL) ||
 977                                         (dh->priv_key == NULL))
 978                                         {
 979                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 980                                         goto err;
 981                                         }
 982                                 }
 983                         r[0]=dh->p;
 984                         r[1]=dh->g;
 985                         r[2]=dh->pub_key;
 986                         }
 987                 else
 988 #endif
 989 #ifndef OPENSSL_NO_ECDH
 990                         if (type & SSL_kEECDH)
 991                         {
 992                         const EC_GROUP *group;
 993
 994                         ecdhp=cert->ecdh_tmp;
 995                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
 996                                 {
 997                                 ecdhp=s->cert->ecdh_tmp_cb(s,
 998                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 999                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1000                                 }
1001                         if (ecdhp == NULL)
1002                                 {
1003                                 al=SSL_AD_HANDSHAKE_FAILURE;
1004                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1005                                 goto f_err;
1006                                 }
1007
1008                         if (s->s3->tmp.ecdh != NULL)
1009                                 {
1010                                 EC_KEY_free(s->s3->tmp.ecdh);
1011                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1012                                 goto err;
1013                                 }
1014
1015                         /* Duplicate the ECDH structure. */
1016                         if (ecdhp == NULL)
1017                                 {
1018                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1019                                 goto err;
1020                                 }
1021                         if (!EC_KEY_up_ref(ecdhp))
1022                                 {
1023                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1024                                 goto err;
1025                                 }
1026                         ecdh = ecdhp;
1027
1028                         s->s3->tmp.ecdh=ecdh;
1029                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1030                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1031                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1032                                 {
1033                                 if(!EC_KEY_generate_key(ecdh))
1034                                     {
1035                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1036                                     goto err;
1037                                     }
1038                                 }
1039
1040                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1041                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1042                             (EC_KEY_get0_private_key(ecdh) == NULL))
1043                                 {
1044                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1045                                 goto err;
1046                                 }
1047
1048                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1049                             (EC_GROUP_get_degree(group) > 163))
1050                                 {
1051                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1052                                 goto err;
1053                                 }
1054
1055                         /* XXX: For now, we only support ephemeral ECDH
1056                          * keys over named (not generic) curves. For
1057                          * supported named curves, curve_id is non-zero.
1058                          */
1059                         if ((curve_id =
1060                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1061                             == 0)
1062                                 {
1063                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1064                                 goto err;
1065                                 }
1066
1067                         /* Encode the public key.
1068                          * First check the size of encoding and
1069                          * allocate memory accordingly.
1070                          */
1071                         encodedlen = EC_POINT_point2oct(group,
1072                             EC_KEY_get0_public_key(ecdh),
1073                             POINT_CONVERSION_UNCOMPRESSED,
1074                             NULL, 0, NULL);
1075
1076                         encodedPoint = (unsigned char *)
1077                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1078                         bn_ctx = BN_CTX_new();
1079                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1080                                 {
1081                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1082                                 goto err;
1083                                 }
1084
1085
1086                         encodedlen = EC_POINT_point2oct(group,
1087                             EC_KEY_get0_public_key(ecdh),
1088                             POINT_CONVERSION_UNCOMPRESSED,
1089                             encodedPoint, encodedlen, bn_ctx);
1090
1091                         if (encodedlen == 0)
1092                                 {
1093                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1094                                 goto err;
1095                                 }
1096
1097                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1098
1099                         /* XXX: For now, we only support named (not
1100                          * generic) curves in ECDH ephemeral key exchanges.
1101                          * In this situation, we need four additional bytes
1102                          * to encode the entire ServerECDHParams
1103                          * structure.
1104                          */
1105                         n = 4 + encodedlen;
1106
1107                         /* We'll generate the serverKeyExchange message
1108                          * explicitly so we can set these to NULLs
1109                          */
1110                         r[0]=NULL;
1111                         r[1]=NULL;
1112                         r[2]=NULL;
1113                         r[3]=NULL;
1114                         }
1115                 else
1116 #endif /* !OPENSSL_NO_ECDH */
1117 #ifndef OPENSSL_NO_PSK
1118                         if (type & SSL_kPSK)
1119                                 {
1120                                 /* reserve size for record length and PSK identity hint*/
1121                                 n+=2+strlen(s->ctx->psk_identity_hint);
1122                                 }
1123                         else
1124 #endif /* !OPENSSL_NO_PSK */
1125                         {
1126                         al=SSL_AD_HANDSHAKE_FAILURE;
1127                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1128                         goto f_err;
1129                         }
1130                 for (i=0; r[i] != NULL; i++)
1131                         {
1132                         nr[i]=BN_num_bytes(r[i]);
1133                         n+=2+nr[i];
1134                         }
1135
1136                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1137                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1138                         {
1139                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1140                                 == NULL)
1141                                 {
1142                                 al=SSL_AD_DECODE_ERROR;
1143                                 goto f_err;
1144                                 }
1145                         kn=EVP_PKEY_size(pkey);
1146                         }
1147                 else
1148                         {
1149                         pkey=NULL;
1150                         kn=0;
1151                         }
1152
1153                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1154                         {
1155                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1156                         goto err;
1157                         }
1158                 d=(unsigned char *)s->init_buf->data;
1159                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1160
1161                 for (i=0; r[i] != NULL; i++)
1162                         {
1163                         s2n(nr[i],p);
1164                         BN_bn2bin(r[i],p);
1165                         p+=nr[i];
1166                         }
1167
1168 #ifndef OPENSSL_NO_ECDH
1169                 if (type & SSL_kEECDH)
1170                         {
1171                         /* XXX: For now, we only support named (not generic) curves.
1172                          * In this situation, the serverKeyExchange message has:
1173                          * [1 byte CurveType], [2 byte CurveName]
1174                          * [1 byte length of encoded point], followed by
1175                          * the actual encoded point itself
1176                          */
1177                         *p = NAMED_CURVE_TYPE;
1178                         p += 1;
1179                         *p = 0;
1180                         p += 1;
1181                         *p = curve_id;
1182                         p += 1;
1183                         *p = encodedlen;
1184                         p += 1;
1185                         memcpy((unsigned char*)p,
1186                             (unsigned char *)encodedPoint,
1187                             encodedlen);
1188                         OPENSSL_free(encodedPoint);
1189                         p += encodedlen;
1190                         }
1191 #endif
1192
1193 #ifndef OPENSSL_NO_PSK
1194                 if (type & SSL_kPSK)
1195                         {
1196                         /* copy PSK identity hint */
1197                         s2n(strlen(s->ctx->psk_identity_hint), p);
1198                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1199                         p+=strlen(s->ctx->psk_identity_hint);
1200                         }
1201 #endif
1202
1203                 /* not anonymous */
1204                 if (pkey != NULL)
1205                         {
1206                         /* n is the length of the params, they start at
1207                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1208                          * at the end. */
1209 #ifndef OPENSSL_NO_RSA
1210                         if (pkey->type == EVP_PKEY_RSA)
1211                                 {
1212                                 q=md_buf;
1213                                 j=0;
1214                                 for (num=2; num > 0; num--)
1215                                         {
1216                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1217                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1218                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1219                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1220                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1221                                         EVP_DigestFinal_ex(&md_ctx,q,
1222                                                 (unsigned int *)&i);
1223                                         q+=i;
1224                                         j+=i;
1225                                         }
1226                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1227                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1228                                         {
1229                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1230                                         goto err;
1231                                         }
1232                                 s2n(u,p);
1233                                 n+=u+2;
1234                                 }
1235                         else
1236 #endif
1237 #if !defined(OPENSSL_NO_DSA)
1238                                 if (pkey->type == EVP_PKEY_DSA)
1239                                 {
1240                                 /* lets do DSS */
1241                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1242                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1243                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1244                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1245                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1246                                         (unsigned int *)&i,pkey))
1247                                         {
1248                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1249                                         goto err;
1250                                         }
1251                                 s2n(i,p);
1252                                 n+=i+2;
1253                                 }
1254                         else
1255 #endif
1256 #if !defined(OPENSSL_NO_ECDSA)
1257                                 if (pkey->type == EVP_PKEY_EC)
1258                                 {
1259                                 /* let's do ECDSA */
1260                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1261                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1262                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1263                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1264                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1265                                         (unsigned int *)&i,pkey))
1266                                         {
1267                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1268                                         goto err;
1269                                         }
1270                                 s2n(i,p);
1271                                 n+=i+2;
1272                                 }
1273                         else
1274 #endif
1275                                 {
1276                                 /* Is this error check actually needed? */
1277                                 al=SSL_AD_HANDSHAKE_FAILURE;
1278                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1279                                 goto f_err;
1280                                 }
1281                         }
1282
1283                 d = dtls1_set_message_header(s, d,
1284                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1285
1286                 /* we should now have things packed up, so lets send
1287                  * it off */
1288                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1289                 s->init_off=0;
1290
1291                 /* buffer the message to handle re-xmits */
1292                 dtls1_buffer_message(s, 0);
1293                 }
1294
1295         s->state = SSL3_ST_SW_KEY_EXCH_B;
1296         EVP_MD_CTX_cleanup(&md_ctx);
1297         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1298 f_err:
1299         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1300 err:
1301 #ifndef OPENSSL_NO_ECDH
1302         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1303         BN_CTX_free(bn_ctx);
1304 #endif
1305         EVP_MD_CTX_cleanup(&md_ctx);
1306         return(-1);
1307         }
1308
1309 int dtls1_send_certificate_request(SSL *s)
1310         {
1311         unsigned char *p,*d;
1312         int i,j,nl,off,n;
1313         STACK_OF(X509_NAME) *sk=NULL;
1314         X509_NAME *name;
1315         BUF_MEM *buf;
1316         unsigned int msg_len;
1317
1318         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1319                 {
1320                 buf=s->init_buf;
1321
1322                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1323
1324                 /* get the list of acceptable cert types */
1325                 p++;
1326                 n=ssl3_get_req_cert_type(s,p);
1327                 d[0]=n;
1328                 p+=n;
1329                 n++;
1330
1331                 off=n;
1332                 p+=2;
1333                 n+=2;
1334
1335                 sk=SSL_get_client_CA_list(s);
1336                 nl=0;
1337                 if (sk != NULL)
1338                         {
1339                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1340                                 {
1341                                 name=sk_X509_NAME_value(sk,i);
1342                                 j=i2d_X509_NAME(name,NULL);
1343                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1344                                         {
1345                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1346                                         goto err;
1347                                         }
1348                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1349                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1350                                         {
1351                                         s2n(j,p);
1352                                         i2d_X509_NAME(name,&p);
1353                                         n+=2+j;
1354                                         nl+=2+j;
1355                                         }
1356                                 else
1357                                         {
1358                                         d=p;
1359                                         i2d_X509_NAME(name,&p);
1360                                         j-=2; s2n(j,d); j+=2;
1361                                         n+=j;
1362                                         nl+=j;
1363                                         }
1364                                 }
1365                         }
1366                 /* else no CA names */
1367                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1368                 s2n(nl,p);
1369
1370                 d=(unsigned char *)buf->data;
1371                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1372                 l2n3(n,d);
1373                 s2n(s->d1->handshake_write_seq,d);
1374                 s->d1->handshake_write_seq++;
1375
1376                 /* we should now have things packed up, so lets send
1377                  * it off */
1378
1379                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1380                 s->init_off=0;
1381 #ifdef NETSCAPE_HANG_BUG
1382 /* XXX: what to do about this? */
1383                 p=(unsigned char *)s->init_buf->data + s->init_num;
1384
1385                 /* do the header */
1386                 *(p++)=SSL3_MT_SERVER_DONE;
1387                 *(p++)=0;
1388                 *(p++)=0;
1389                 *(p++)=0;
1390                 s->init_num += 4;
1391 #endif
1392
1393                 /* XDTLS:  set message header ? */
1394                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1395                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1396                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1397
1398                 /* buffer the message to handle re-xmits */
1399                 dtls1_buffer_message(s, 0);
1400
1401                 s->state = SSL3_ST_SW_CERT_REQ_B;
1402                 }
1403
1404         /* SSL3_ST_SW_CERT_REQ_B */
1405         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1406 err:
1407         return(-1);
1408         }
1409
1410 int dtls1_send_server_certificate(SSL *s)
1411         {
1412         unsigned long l;
1413         X509 *x;
1414
1415         if (s->state == SSL3_ST_SW_CERT_A)
1416                 {
1417                 x=ssl_get_server_send_cert(s);
1418                 if (x == NULL)
1419                         {
1420                         /* VRS: allow null cert if auth == KRB5 */
1421                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1422                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1423                                 {
1424                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1425                                 return(0);
1426                                 }
1427                         }
1428
1429                 l=dtls1_output_cert_chain(s,x);
1430                 s->state=SSL3_ST_SW_CERT_B;
1431                 s->init_num=(int)l;
1432                 s->init_off=0;
1433
1434                 /* buffer the message to handle re-xmits */
1435                 dtls1_buffer_message(s, 0);
1436                 }
1437
1438         /* SSL3_ST_SW_CERT_B */
1439         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1440         }
1441
1442 #ifndef OPENSSL_NO_TLSEXT
1443 int dtls1_send_newsession_ticket(SSL *s)
1444         {
1445         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1446                 {
1447                 unsigned char *p, *senc, *macstart;
1448                 int len, slen;
1449                 unsigned int hlen, msg_len;
1450                 EVP_CIPHER_CTX ctx;
1451                 HMAC_CTX hctx;
1452                 SSL_CTX *tctx = s->initial_ctx;
1453                 unsigned char iv[EVP_MAX_IV_LENGTH];
1454                 unsigned char key_name[16];
1455
1456                 /* get session encoding length */
1457                 slen = i2d_SSL_SESSION(s->session, NULL);
1458                 /* Some length values are 16 bits, so forget it if session is
1459                  * too long
1460                  */
1461                 if (slen > 0xFF00)
1462                         return -1;
1463                 /* Grow buffer if need be: the length calculation is as
1464                  * follows 12 (DTLS handshake message header) +
1465                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1466                  * 16 (key name) + max_iv_len (iv length) +
1467                  * session_length + max_enc_block_size (max encrypted session
1468                  * length) + max_md_size (HMAC).
1469                  */
1470                 if (!BUF_MEM_grow(s->init_buf,
1471                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1472                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1473                         return -1;
1474                 senc = OPENSSL_malloc(slen);
1475                 if (!senc)
1476                         return -1;
1477                 p = senc;
1478                 i2d_SSL_SESSION(s->session, &p);
1479
1480                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1481                 EVP_CIPHER_CTX_init(&ctx);
1482                 HMAC_CTX_init(&hctx);
1483                 /* Initialize HMAC and cipher contexts. If callback present
1484                  * it does all the work otherwise use generated values
1485                  * from parent ctx.
1486                  */
1487                 if (tctx->tlsext_ticket_key_cb)
1488                         {
1489                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1490                                                          &hctx, 1) < 0)
1491                                 {
1492                                 OPENSSL_free(senc);
1493                                 return -1;
1494                                 }
1495                         }
1496                 else
1497                         {
1498                         RAND_pseudo_bytes(iv, 16);
1499                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1500                                         tctx->tlsext_tick_aes_key, iv);
1501                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1502                                         tlsext_tick_md(), NULL);
1503                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1504                         }
1505                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1506                 /* Skip ticket length for now */
1507                 p += 2;
1508                 /* Output key name */
1509                 macstart = p;
1510                 memcpy(p, key_name, 16);
1511                 p += 16;
1512                 /* output IV */
1513                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1514                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1515                 /* Encrypt session data */
1516                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1517                 p += len;
1518                 EVP_EncryptFinal(&ctx, p, &len);
1519                 p += len;
1520                 EVP_CIPHER_CTX_cleanup(&ctx);
1521
1522                 HMAC_Update(&hctx, macstart, p - macstart);
1523                 HMAC_Final(&hctx, p, &hlen);
1524                 HMAC_CTX_cleanup(&hctx);
1525
1526                 p += hlen;
1527                 /* Now write out lengths: p points to end of data written */
1528                 /* Total length */
1529                 len = p - (unsigned char *)(s->init_buf->data);
1530                 /* Ticket length */
1531                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1532                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1533
1534                 /* number of bytes to write */
1535                 s->init_num= len;
1536                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1537                 s->init_off=0;
1538                 OPENSSL_free(senc);
1539
1540                 /* XDTLS:  set message header ? */
1541                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1542                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1543                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1544
1545                 /* buffer the message to handle re-xmits */
1546                 dtls1_buffer_message(s, 0);
1547                 }
1548
1549         /* SSL3_ST_SW_SESSION_TICKET_B */
1550         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1551         }
1552 #endif