crypto/openssl/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         int listen;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         listen = s->d1->listen;
 165
 166         /* init things to blank */
 167         s->in_handshake++;
 168         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 169
 170         s->d1->listen = listen;
 171
 172         if (s->cert == NULL)
 173                 {
 174                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 175                 return(-1);
 176                 }
 177
 178         for (;;)
 179                 {
 180                 state=s->state;
 181
 182                 switch (s->state)
 183                         {
 184                 case SSL_ST_RENEGOTIATE:
 185                         s->new_session=1;
 186                         /* s->state=SSL_ST_ACCEPT; */
 187
 188                 case SSL_ST_BEFORE:
 189                 case SSL_ST_ACCEPT:
 190                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 191                 case SSL_ST_OK|SSL_ST_ACCEPT:
 192
 193                         s->server=1;
 194                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 195
 196                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 197                                 {
 198                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 199                                 return -1;
 200                                 }
 201                         s->type=SSL_ST_ACCEPT;
 202
 203                         if (s->init_buf == NULL)
 204                                 {
 205                                 if ((buf=BUF_MEM_new()) == NULL)
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 211                                         {
 212                                         ret= -1;
 213                                         goto end;
 214                                         }
 215                                 s->init_buf=buf;
 216                                 }
 217
 218                         if (!ssl3_setup_buffers(s))
 219                                 {
 220                                 ret= -1;
 221                                 goto end;
 222                                 }
 223
 224                         s->init_num=0;
 225
 226                         if (s->state != SSL_ST_RENEGOTIATE)
 227                                 {
 228                                 /* Ok, we now need to push on a buffering BIO so that
 229                                  * the output is sent in a way that TCP likes :-)
 230                                  */
 231                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 232
 233                                 ssl3_init_finished_mac(s);
 234                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 235                                 s->ctx->stats.sess_accept++;
 236                                 }
 237                         else
 238                                 {
 239                                 /* s->state == SSL_ST_RENEGOTIATE,
 240                                  * we will just send a HelloRequest */
 241                                 s->ctx->stats.sess_accept_renegotiate++;
 242                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 243                                 }
 244
 245                         break;
 246
 247                 case SSL3_ST_SW_HELLO_REQ_A:
 248                 case SSL3_ST_SW_HELLO_REQ_B:
 249
 250                         s->shutdown=0;
 251                         dtls1_start_timer(s);
 252                         ret=dtls1_send_hello_request(s);
 253                         if (ret <= 0) goto end;
 254                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 255                         s->state=SSL3_ST_SW_FLUSH;
 256                         s->init_num=0;
 257
 258                         ssl3_init_finished_mac(s);
 259                         break;
 260
 261                 case SSL3_ST_SW_HELLO_REQ_C:
 262                         s->state=SSL_ST_OK;
 263                         break;
 264
 265                 case SSL3_ST_SR_CLNT_HELLO_A:
 266                 case SSL3_ST_SR_CLNT_HELLO_B:
 267                 case SSL3_ST_SR_CLNT_HELLO_C:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_get_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         dtls1_stop_timer(s);
 273
 274                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 275                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 276                         else
 277                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 278
 279                         s->init_num=0;
 280
 281                         /* Reflect ClientHello sequence to remain stateless while listening */
 282                         if (listen)
 283                                 {
 284                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
 285                                 }
 286
 287                         /* If we're just listening, stop here */
 288                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 289                                 {
 290                                 ret = 2;
 291                                 s->d1->listen = 0;
 292                                 /* Set expected sequence numbers
 293                                  * to continue the handshake.
 294                                  */
 295                                 s->d1->handshake_read_seq = 2;
 296                                 s->d1->handshake_write_seq = 1;
 297                                 s->d1->next_handshake_write_seq = 1;
 298                                 goto end;
 299                                 }
 300
 301                         break;
 302
 303                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 304                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 305
 306                         ret = dtls1_send_hello_verify_request(s);
 307                         if ( ret <= 0) goto end;
 308                         s->state=SSL3_ST_SW_FLUSH;
 309                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 310
 311                         /* HelloVerifyRequest resets Finished MAC */
 312                         if (s->version != DTLS1_BAD_VER)
 313                                 ssl3_init_finished_mac(s);
 314                         break;
 315
 316                 case SSL3_ST_SW_SRVR_HELLO_A:
 317                 case SSL3_ST_SW_SRVR_HELLO_B:
 318                         s->new_session = 2;
 319                         dtls1_start_timer(s);
 320                         ret=dtls1_send_server_hello(s);
 321                         if (ret <= 0) goto end;
 322
 323 #ifndef OPENSSL_NO_TLSEXT
 324                         if (s->hit)
 325                                 {
 326                                 if (s->tlsext_ticket_expected)
 327                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 328                                 else
 329                                         s->state=SSL3_ST_SW_CHANGE_A;
 330                                 }
 331 #else
 332                         if (s->hit)
 333                                         s->state=SSL3_ST_SW_CHANGE_A;
 334 #endif
 335                         else
 336                                 s->state=SSL3_ST_SW_CERT_A;
 337                         s->init_num=0;
 338                         break;
 339
 340                 case SSL3_ST_SW_CERT_A:
 341                 case SSL3_ST_SW_CERT_B:
 342                         /* Check if it is anon DH or normal PSK */
 343                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 344                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 345                                 {
 346                                 dtls1_start_timer(s);
 347                                 ret=dtls1_send_server_certificate(s);
 348                                 if (ret <= 0) goto end;
 349 #ifndef OPENSSL_NO_TLSEXT
 350                                 if (s->tlsext_status_expected)
 351                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 352                                 else
 353                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 354                                 }
 355                         else
 356                                 {
 357                                 skip = 1;
 358                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 359                                 }
 360 #else
 361                                 }
 362                         else
 363                                 skip=1;
 364
 365                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 366 #endif
 367                         s->init_num=0;
 368                         break;
 369
 370                 case SSL3_ST_SW_KEY_EXCH_A:
 371                 case SSL3_ST_SW_KEY_EXCH_B:
 372                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 373
 374                         /* clear this, it may get reset by
 375                          * send_server_key_exchange */
 376                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 377 #ifndef OPENSSL_NO_KRB5
 378                                 && !(alg_k & SSL_kKRB5)
 379 #endif /* OPENSSL_NO_KRB5 */
 380                                 )
 381                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 382                                  * even when forbidden by protocol specs
 383                                  * (handshake may fail as clients are not required to
 384                                  * be able to handle this) */
 385                                 s->s3->tmp.use_rsa_tmp=1;
 386                         else
 387                                 s->s3->tmp.use_rsa_tmp=0;
 388
 389                         /* only send if a DH key exchange or
 390                          * RSA but we have a sign only certificate */
 391                         if (s->s3->tmp.use_rsa_tmp
 392                         /* PSK: send ServerKeyExchange if PSK identity
 393                          * hint if provided */
 394 #ifndef OPENSSL_NO_PSK
 395                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 396 #endif
 397                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 398                             || (alg_k & SSL_kEECDH)
 399                             || ((alg_k & SSL_kRSA)
 400                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 401                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 402                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 403                                         )
 404                                     )
 405                                 )
 406                             )
 407                                 {
 408                                 dtls1_start_timer(s);
 409                                 ret=dtls1_send_server_key_exchange(s);
 410                                 if (ret <= 0) goto end;
 411                                 }
 412                         else
 413                                 skip=1;
 414
 415                         s->state=SSL3_ST_SW_CERT_REQ_A;
 416                         s->init_num=0;
 417                         break;
 418
 419                 case SSL3_ST_SW_CERT_REQ_A:
 420                 case SSL3_ST_SW_CERT_REQ_B:
 421                         if (/* don't request cert unless asked for it: */
 422                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 423                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 424                                  * don't request cert during re-negotiation: */
 425                                 ((s->session->peer != NULL) &&
 426                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 427                                 /* never request cert in anonymous ciphersuites
 428                                  * (see section "Certificate request" in SSL 3 drafts
 429                                  * and in RFC 2246): */
 430                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 431                                  /* ... except when the application insists on verification
 432                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 433                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 434                                  /* never request cert in Kerberos ciphersuites */
 435                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 436                                 /* With normal PSK Certificates and
 437                                  * Certificate Requests are omitted */
 438                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 439                                 {
 440                                 /* no cert request */
 441                                 skip=1;
 442                                 s->s3->tmp.cert_request=0;
 443                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 444                                 }
 445                         else
 446                                 {
 447                                 s->s3->tmp.cert_request=1;
 448                                 dtls1_start_timer(s);
 449                                 ret=dtls1_send_certificate_request(s);
 450                                 if (ret <= 0) goto end;
 451 #ifndef NETSCAPE_HANG_BUG
 452                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 453 #else
 454                                 s->state=SSL3_ST_SW_FLUSH;
 455                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 456 #endif
 457                                 s->init_num=0;
 458                                 }
 459                         break;
 460
 461                 case SSL3_ST_SW_SRVR_DONE_A:
 462                 case SSL3_ST_SW_SRVR_DONE_B:
 463                         dtls1_start_timer(s);
 464                         ret=dtls1_send_server_done(s);
 465                         if (ret <= 0) goto end;
 466                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 467                         s->state=SSL3_ST_SW_FLUSH;
 468                         s->init_num=0;
 469                         break;
 470
 471                 case SSL3_ST_SW_FLUSH:
 472                         s->rwstate=SSL_WRITING;
 473                         if (BIO_flush(s->wbio) <= 0)
 474                                 {
 475                                 ret= -1;
 476                                 goto end;
 477                                 }
 478                         s->rwstate=SSL_NOTHING;
 479                         s->state=s->s3->tmp.next_state;
 480                         break;
 481
 482                 case SSL3_ST_SR_CERT_A:
 483                 case SSL3_ST_SR_CERT_B:
 484                         /* Check for second client hello (MS SGC) */
 485                         ret = ssl3_check_client_hello(s);
 486                         if (ret <= 0)
 487                                 goto end;
 488                         dtls1_stop_timer(s);
 489                         if (ret == 2)
 490                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 491                         else {
 492                                 /* could be sent for a DH cert, even if we
 493                                  * have not asked for it :-) */
 494                                 ret=ssl3_get_client_certificate(s);
 495                                 if (ret <= 0) goto end;
 496                                 dtls1_stop_timer(s);
 497                                 s->init_num=0;
 498                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 499                         }
 500                         break;
 501
 502                 case SSL3_ST_SR_KEY_EXCH_A:
 503                 case SSL3_ST_SR_KEY_EXCH_B:
 504                         ret=ssl3_get_client_key_exchange(s);
 505                         if (ret <= 0) goto end;
 506                         dtls1_stop_timer(s);
 507                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 508                         s->init_num=0;
 509
 510                         if (ret == 2)
 511                                 {
 512                                 /* For the ECDH ciphersuites when
 513                                  * the client sends its ECDH pub key in
 514                                  * a certificate, the CertificateVerify
 515                                  * message is not sent.
 516                                  */
 517                                 s->state=SSL3_ST_SR_FINISHED_A;
 518                                 s->init_num = 0;
 519                                 }
 520                         else
 521                                 {
 522                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 523                                 s->init_num=0;
 524
 525                                 /* We need to get hashes here so if there is
 526                                  * a client cert, it can be verified */
 527                                 s->method->ssl3_enc->cert_verify_mac(s,
 528                                         NID_md5,
 529                                         &(s->s3->tmp.cert_verify_md[0]));
 530                                 s->method->ssl3_enc->cert_verify_mac(s,
 531                                         NID_sha1,
 532                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 533                                 }
 534                         break;
 535
 536                 case SSL3_ST_SR_CERT_VRFY_A:
 537                 case SSL3_ST_SR_CERT_VRFY_B:
 538
 539                         s->d1->change_cipher_spec_ok = 1;
 540                         /* we should decide if we expected this one */
 541                         ret=ssl3_get_cert_verify(s);
 542                         if (ret <= 0) goto end;
 543                         dtls1_stop_timer(s);
 544
 545                         s->state=SSL3_ST_SR_FINISHED_A;
 546                         s->init_num=0;
 547                         break;
 548
 549                 case SSL3_ST_SR_FINISHED_A:
 550                 case SSL3_ST_SR_FINISHED_B:
 551                         s->d1->change_cipher_spec_ok = 1;
 552                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 553                                 SSL3_ST_SR_FINISHED_B);
 554                         if (ret <= 0) goto end;
 555                         dtls1_stop_timer(s);
 556                         if (s->hit)
 557                                 s->state=SSL_ST_OK;
 558 #ifndef OPENSSL_NO_TLSEXT
 559                         else if (s->tlsext_ticket_expected)
 560                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 561 #endif
 562                         else
 563                                 s->state=SSL3_ST_SW_CHANGE_A;
 564                         s->init_num=0;
 565                         break;
 566
 567 #ifndef OPENSSL_NO_TLSEXT
 568                 case SSL3_ST_SW_SESSION_TICKET_A:
 569                 case SSL3_ST_SW_SESSION_TICKET_B:
 570                         ret=dtls1_send_newsession_ticket(s);
 571                         if (ret <= 0) goto end;
 572                         s->state=SSL3_ST_SW_CHANGE_A;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_SW_CERT_STATUS_A:
 577                 case SSL3_ST_SW_CERT_STATUS_B:
 578                         ret=ssl3_send_cert_status(s);
 579                         if (ret <= 0) goto end;
 580                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 581                         s->init_num=0;
 582                         break;
 583
 584 #endif
 585
 586                 case SSL3_ST_SW_CHANGE_A:
 587                 case SSL3_ST_SW_CHANGE_B:
 588
 589                         s->session->cipher=s->s3->tmp.new_cipher;
 590                         if (!s->method->ssl3_enc->setup_key_block(s))
 591                                 { ret= -1; goto end; }
 592
 593                         ret=dtls1_send_change_cipher_spec(s,
 594                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 595
 596                         if (ret <= 0) goto end;
 597                         s->state=SSL3_ST_SW_FINISHED_A;
 598                         s->init_num=0;
 599
 600                         if (!s->method->ssl3_enc->change_cipher_state(s,
 601                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 602                                 {
 603                                 ret= -1;
 604                                 goto end;
 605                                 }
 606
 607                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 608                         break;
 609
 610                 case SSL3_ST_SW_FINISHED_A:
 611                 case SSL3_ST_SW_FINISHED_B:
 612                         ret=dtls1_send_finished(s,
 613                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 614                                 s->method->ssl3_enc->server_finished_label,
 615                                 s->method->ssl3_enc->server_finished_label_len);
 616                         if (ret <= 0) goto end;
 617                         s->state=SSL3_ST_SW_FLUSH;
 618                         if (s->hit)
 619                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 620                         else
 621                                 s->s3->tmp.next_state=SSL_ST_OK;
 622                         s->init_num=0;
 623                         break;
 624
 625                 case SSL_ST_OK:
 626                         /* clean a few things up */
 627                         ssl3_cleanup_key_block(s);
 628
 629 #if 0
 630                         BUF_MEM_free(s->init_buf);
 631                         s->init_buf=NULL;
 632 #endif
 633
 634                         /* remove buffering on output */
 635                         ssl_free_wbio_buffer(s);
 636
 637                         s->init_num=0;
 638
 639                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 640                                 {
 641                                 /* actually not necessarily a 'new' session unless
 642                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 643
 644                                 s->new_session=0;
 645
 646                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 647
 648                                 s->ctx->stats.sess_accept_good++;
 649                                 /* s->server=1; */
 650                                 s->handshake_func=dtls1_accept;
 651
 652                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 653                                 }
 654
 655                         ret = 1;
 656
 657                         /* done handshaking, next message is client hello */
 658                         s->d1->handshake_read_seq = 0;
 659                         /* next message is server hello */
 660                         s->d1->handshake_write_seq = 0;
 661                         s->d1->next_handshake_write_seq = 0;
 662                         goto end;
 663                         /* break; */
 664
 665                 default:
 666                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 667                         ret= -1;
 668                         goto end;
 669                         /* break; */
 670                         }
 671
 672                 if (!s->s3->tmp.reuse_message && !skip)
 673                         {
 674                         if (s->debug)
 675                                 {
 676                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 677                                         goto end;
 678                                 }
 679
 680
 681                         if ((cb != NULL) && (s->state != state))
 682                                 {
 683                                 new_state=s->state;
 684                                 s->state=state;
 685                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 686                                 s->state=new_state;
 687                                 }
 688                         }
 689                 skip=0;
 690                 }
 691 end:
 692         /* BIO_flush(s->wbio); */
 693
 694         s->in_handshake--;
 695         if (cb != NULL)
 696                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 697         return(ret);
 698         }
 699
 700 int dtls1_send_hello_request(SSL *s)
 701         {
 702         unsigned char *p;
 703
 704         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 705                 {
 706                 p=(unsigned char *)s->init_buf->data;
 707                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 708
 709                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 710                 /* number of bytes to write */
 711                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 712                 s->init_off=0;
 713
 714                 /* no need to buffer this message, since there are no retransmit
 715                  * requests for it */
 716                 }
 717
 718         /* SSL3_ST_SW_HELLO_REQ_B */
 719         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 720         }
 721
 722 int dtls1_send_hello_verify_request(SSL *s)
 723         {
 724         unsigned int msg_len;
 725         unsigned char *msg, *buf, *p;
 726
 727         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 728                 {
 729                 buf = (unsigned char *)s->init_buf->data;
 730
 731                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 732                 *(p++) = s->version >> 8;
 733                 *(p++) = s->version & 0xFF;
 734
 735                 if (s->ctx->app_gen_cookie_cb == NULL ||
 736                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 737                          &(s->d1->cookie_len)) == 0)
 738                         {
 739                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 740                         return 0;
 741                         }
 742
 743                 *(p++) = (unsigned char) s->d1->cookie_len;
 744                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 745                 p += s->d1->cookie_len;
 746                 msg_len = p - msg;
 747
 748                 dtls1_set_message_header(s, buf,
 749                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 750
 751                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 752                 /* number of bytes to write */
 753                 s->init_num=p-buf;
 754                 s->init_off=0;
 755                 }
 756
 757         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 758         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 759         }
 760
 761 int dtls1_send_server_hello(SSL *s)
 762         {
 763         unsigned char *buf;
 764         unsigned char *p,*d;
 765         int i;
 766         unsigned int sl;
 767         unsigned long l,Time;
 768
 769         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 770                 {
 771                 buf=(unsigned char *)s->init_buf->data;
 772                 p=s->s3->server_random;
 773                 Time=(unsigned long)time(NULL);                 /* Time */
 774                 l2n(Time,p);
 775                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 776                 /* Do the message type and length last */
 777                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 778
 779                 *(p++)=s->version>>8;
 780                 *(p++)=s->version&0xff;
 781
 782                 /* Random stuff */
 783                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 784                 p+=SSL3_RANDOM_SIZE;
 785
 786                 /* now in theory we have 3 options to sending back the
 787                  * session id.  If it is a re-use, we send back the
 788                  * old session-id, if it is a new session, we send
 789                  * back the new session-id or we send back a 0 length
 790                  * session-id if we want it to be single use.
 791                  * Currently I will not implement the '0' length session-id
 792                  * 12-Jan-98 - I'll now support the '0' length stuff.
 793                  */
 794                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 795                         s->session->session_id_length=0;
 796
 797                 sl=s->session->session_id_length;
 798                 if (sl > sizeof s->session->session_id)
 799                         {
 800                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 801                         return -1;
 802                         }
 803                 *(p++)=sl;
 804                 memcpy(p,s->session->session_id,sl);
 805                 p+=sl;
 806
 807                 /* put the cipher */
 808                 if (s->s3->tmp.new_cipher == NULL)
 809                         return -1;
 810                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 811                 p+=i;
 812
 813                 /* put the compression method */
 814 #ifdef OPENSSL_NO_COMP
 815                 *(p++)=0;
 816 #else
 817                 if (s->s3->tmp.new_compression == NULL)
 818                         *(p++)=0;
 819                 else
 820                         *(p++)=s->s3->tmp.new_compression->id;
 821 #endif
 822
 823 #ifndef OPENSSL_NO_TLSEXT
 824                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 825                         {
 826                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 827                         return -1;
 828                         }
 829 #endif
 830
 831                 /* do the header */
 832                 l=(p-d);
 833                 d=buf;
 834
 835                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 836
 837                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 838                 /* number of bytes to write */
 839                 s->init_num=p-buf;
 840                 s->init_off=0;
 841
 842                 /* buffer the message to handle re-xmits */
 843                 dtls1_buffer_message(s, 0);
 844                 }
 845
 846         /* SSL3_ST_SW_SRVR_HELLO_B */
 847         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 848         }
 849
 850 int dtls1_send_server_done(SSL *s)
 851         {
 852         unsigned char *p;
 853
 854         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 855                 {
 856                 p=(unsigned char *)s->init_buf->data;
 857
 858                 /* do the header */
 859                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 860
 861                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 862                 /* number of bytes to write */
 863                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 864                 s->init_off=0;
 865
 866                 /* buffer the message to handle re-xmits */
 867                 dtls1_buffer_message(s, 0);
 868                 }
 869
 870         /* SSL3_ST_SW_SRVR_DONE_B */
 871         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 872         }
 873
 874 int dtls1_send_server_key_exchange(SSL *s)
 875         {
 876 #ifndef OPENSSL_NO_RSA
 877         unsigned char *q;
 878         int j,num;
 879         RSA *rsa;
 880         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 881         unsigned int u;
 882 #endif
 883 #ifndef OPENSSL_NO_DH
 884         DH *dh=NULL,*dhp;
 885 #endif
 886 #ifndef OPENSSL_NO_ECDH
 887         EC_KEY *ecdh=NULL, *ecdhp;
 888         unsigned char *encodedPoint = NULL;
 889         int encodedlen = 0;
 890         int curve_id = 0;
 891         BN_CTX *bn_ctx = NULL;
 892 #endif
 893         EVP_PKEY *pkey;
 894         unsigned char *p,*d;
 895         int al,i;
 896         unsigned long type;
 897         int n;
 898         CERT *cert;
 899         BIGNUM *r[4];
 900         int nr[4],kn;
 901         BUF_MEM *buf;
 902         EVP_MD_CTX md_ctx;
 903
 904         EVP_MD_CTX_init(&md_ctx);
 905         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 906                 {
 907                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 908                 cert=s->cert;
 909
 910                 buf=s->init_buf;
 911
 912                 r[0]=r[1]=r[2]=r[3]=NULL;
 913                 n=0;
 914 #ifndef OPENSSL_NO_RSA
 915                 if (type & SSL_kRSA)
 916                         {
 917                         rsa=cert->rsa_tmp;
 918                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 919                                 {
 920                                 rsa=s->cert->rsa_tmp_cb(s,
 921                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 922                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 923                                 if(rsa == NULL)
 924                                 {
 925                                         al=SSL_AD_HANDSHAKE_FAILURE;
 926                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 927                                         goto f_err;
 928                                 }
 929                                 RSA_up_ref(rsa);
 930                                 cert->rsa_tmp=rsa;
 931                                 }
 932                         if (rsa == NULL)
 933                                 {
 934                                 al=SSL_AD_HANDSHAKE_FAILURE;
 935                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 936                                 goto f_err;
 937                                 }
 938                         r[0]=rsa->n;
 939                         r[1]=rsa->e;
 940                         s->s3->tmp.use_rsa_tmp=1;
 941                         }
 942                 else
 943 #endif
 944 #ifndef OPENSSL_NO_DH
 945                         if (type & SSL_kEDH)
 946                         {
 947                         dhp=cert->dh_tmp;
 948                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 949                                 dhp=s->cert->dh_tmp_cb(s,
 950                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 951                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 952                         if (dhp == NULL)
 953                                 {
 954                                 al=SSL_AD_HANDSHAKE_FAILURE;
 955                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 956                                 goto f_err;
 957                                 }
 958
 959                         if (s->s3->tmp.dh != NULL)
 960                                 {
 961                                 DH_free(dh);
 962                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 963                                 goto err;
 964                                 }
 965
 966                         if ((dh=DHparams_dup(dhp)) == NULL)
 967                                 {
 968                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 969                                 goto err;
 970                                 }
 971
 972                         s->s3->tmp.dh=dh;
 973                         if ((dhp->pub_key == NULL ||
 974                              dhp->priv_key == NULL ||
 975                              (s->options & SSL_OP_SINGLE_DH_USE)))
 976                                 {
 977                                 if(!DH_generate_key(dh))
 978                                     {
 979                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 980                                            ERR_R_DH_LIB);
 981                                     goto err;
 982                                     }
 983                                 }
 984                         else
 985                                 {
 986                                 dh->pub_key=BN_dup(dhp->pub_key);
 987                                 dh->priv_key=BN_dup(dhp->priv_key);
 988                                 if ((dh->pub_key == NULL) ||
 989                                         (dh->priv_key == NULL))
 990                                         {
 991                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 992                                         goto err;
 993                                         }
 994                                 }
 995                         r[0]=dh->p;
 996                         r[1]=dh->g;
 997                         r[2]=dh->pub_key;
 998                         }
 999                 else
1000 #endif
1001 #ifndef OPENSSL_NO_ECDH
1002                         if (type & SSL_kEECDH)
1003                         {
1004                         const EC_GROUP *group;
1005
1006                         ecdhp=cert->ecdh_tmp;
1007                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1008                                 {
1009                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1010                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1011                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1012                                 }
1013                         if (ecdhp == NULL)
1014                                 {
1015                                 al=SSL_AD_HANDSHAKE_FAILURE;
1016                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1017                                 goto f_err;
1018                                 }
1019
1020                         if (s->s3->tmp.ecdh != NULL)
1021                                 {
1022                                 EC_KEY_free(s->s3->tmp.ecdh);
1023                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1024                                 goto err;
1025                                 }
1026
1027                         /* Duplicate the ECDH structure. */
1028                         if (ecdhp == NULL)
1029                                 {
1030                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1031                                 goto err;
1032                                 }
1033                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1034                                 {
1035                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1036                                 goto err;
1037                                 }
1038
1039                         s->s3->tmp.ecdh=ecdh;
1040                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1041                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1042                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1043                                 {
1044                                 if(!EC_KEY_generate_key(ecdh))
1045                                     {
1046                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1047                                     goto err;
1048                                     }
1049                                 }
1050
1051                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1052                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1053                             (EC_KEY_get0_private_key(ecdh) == NULL))
1054                                 {
1055                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1056                                 goto err;
1057                                 }
1058
1059                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1060                             (EC_GROUP_get_degree(group) > 163))
1061                                 {
1062                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1063                                 goto err;
1064                                 }
1065
1066                         /* XXX: For now, we only support ephemeral ECDH
1067                          * keys over named (not generic) curves. For
1068                          * supported named curves, curve_id is non-zero.
1069                          */
1070                         if ((curve_id =
1071                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1072                             == 0)
1073                                 {
1074                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1075                                 goto err;
1076                                 }
1077
1078                         /* Encode the public key.
1079                          * First check the size of encoding and
1080                          * allocate memory accordingly.
1081                          */
1082                         encodedlen = EC_POINT_point2oct(group,
1083                             EC_KEY_get0_public_key(ecdh),
1084                             POINT_CONVERSION_UNCOMPRESSED,
1085                             NULL, 0, NULL);
1086
1087                         encodedPoint = (unsigned char *)
1088                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1089                         bn_ctx = BN_CTX_new();
1090                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1091                                 {
1092                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1093                                 goto err;
1094                                 }
1095
1096
1097                         encodedlen = EC_POINT_point2oct(group,
1098                             EC_KEY_get0_public_key(ecdh),
1099                             POINT_CONVERSION_UNCOMPRESSED,
1100                             encodedPoint, encodedlen, bn_ctx);
1101
1102                         if (encodedlen == 0)
1103                                 {
1104                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1105                                 goto err;
1106                                 }
1107
1108                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1109
1110                         /* XXX: For now, we only support named (not
1111                          * generic) curves in ECDH ephemeral key exchanges.
1112                          * In this situation, we need four additional bytes
1113                          * to encode the entire ServerECDHParams
1114                          * structure.
1115                          */
1116                         n = 4 + encodedlen;
1117
1118                         /* We'll generate the serverKeyExchange message
1119                          * explicitly so we can set these to NULLs
1120                          */
1121                         r[0]=NULL;
1122                         r[1]=NULL;
1123                         r[2]=NULL;
1124                         r[3]=NULL;
1125                         }
1126                 else
1127 #endif /* !OPENSSL_NO_ECDH */
1128 #ifndef OPENSSL_NO_PSK
1129                         if (type & SSL_kPSK)
1130                                 {
1131                                 /* reserve size for record length and PSK identity hint*/
1132                                 n+=2+strlen(s->ctx->psk_identity_hint);
1133                                 }
1134                         else
1135 #endif /* !OPENSSL_NO_PSK */
1136                         {
1137                         al=SSL_AD_HANDSHAKE_FAILURE;
1138                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1139                         goto f_err;
1140                         }
1141                 for (i=0; r[i] != NULL; i++)
1142                         {
1143                         nr[i]=BN_num_bytes(r[i]);
1144                         n+=2+nr[i];
1145                         }
1146
1147                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1148                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1149                         {
1150                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1151                                 == NULL)
1152                                 {
1153                                 al=SSL_AD_DECODE_ERROR;
1154                                 goto f_err;
1155                                 }
1156                         kn=EVP_PKEY_size(pkey);
1157                         }
1158                 else
1159                         {
1160                         pkey=NULL;
1161                         kn=0;
1162                         }
1163
1164                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1165                         {
1166                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1167                         goto err;
1168                         }
1169                 d=(unsigned char *)s->init_buf->data;
1170                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1171
1172                 for (i=0; r[i] != NULL; i++)
1173                         {
1174                         s2n(nr[i],p);
1175                         BN_bn2bin(r[i],p);
1176                         p+=nr[i];
1177                         }
1178
1179 #ifndef OPENSSL_NO_ECDH
1180                 if (type & SSL_kEECDH)
1181                         {
1182                         /* XXX: For now, we only support named (not generic) curves.
1183                          * In this situation, the serverKeyExchange message has:
1184                          * [1 byte CurveType], [2 byte CurveName]
1185                          * [1 byte length of encoded point], followed by
1186                          * the actual encoded point itself
1187                          */
1188                         *p = NAMED_CURVE_TYPE;
1189                         p += 1;
1190                         *p = 0;
1191                         p += 1;
1192                         *p = curve_id;
1193                         p += 1;
1194                         *p = encodedlen;
1195                         p += 1;
1196                         memcpy((unsigned char*)p,
1197                             (unsigned char *)encodedPoint,
1198                             encodedlen);
1199                         OPENSSL_free(encodedPoint);
1200                         p += encodedlen;
1201                         }
1202 #endif
1203
1204 #ifndef OPENSSL_NO_PSK
1205                 if (type & SSL_kPSK)
1206                         {
1207                         /* copy PSK identity hint */
1208                         s2n(strlen(s->ctx->psk_identity_hint), p);
1209                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1210                         p+=strlen(s->ctx->psk_identity_hint);
1211                         }
1212 #endif
1213
1214                 /* not anonymous */
1215                 if (pkey != NULL)
1216                         {
1217                         /* n is the length of the params, they start at
1218                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1219                          * at the end. */
1220 #ifndef OPENSSL_NO_RSA
1221                         if (pkey->type == EVP_PKEY_RSA)
1222                                 {
1223                                 q=md_buf;
1224                                 j=0;
1225                                 for (num=2; num > 0; num--)
1226                                         {
1227                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1228                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1229                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1230                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1231                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1232                                         EVP_DigestFinal_ex(&md_ctx,q,
1233                                                 (unsigned int *)&i);
1234                                         q+=i;
1235                                         j+=i;
1236                                         }
1237                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1238                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1239                                         {
1240                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1241                                         goto err;
1242                                         }
1243                                 s2n(u,p);
1244                                 n+=u+2;
1245                                 }
1246                         else
1247 #endif
1248 #if !defined(OPENSSL_NO_DSA)
1249                                 if (pkey->type == EVP_PKEY_DSA)
1250                                 {
1251                                 /* lets do DSS */
1252                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1253                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1254                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1255                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1256                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1257                                         (unsigned int *)&i,pkey))
1258                                         {
1259                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1260                                         goto err;
1261                                         }
1262                                 s2n(i,p);
1263                                 n+=i+2;
1264                                 }
1265                         else
1266 #endif
1267 #if !defined(OPENSSL_NO_ECDSA)
1268                                 if (pkey->type == EVP_PKEY_EC)
1269                                 {
1270                                 /* let's do ECDSA */
1271                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1272                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1273                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1274                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1275                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1276                                         (unsigned int *)&i,pkey))
1277                                         {
1278                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1279                                         goto err;
1280                                         }
1281                                 s2n(i,p);
1282                                 n+=i+2;
1283                                 }
1284                         else
1285 #endif
1286                                 {
1287                                 /* Is this error check actually needed? */
1288                                 al=SSL_AD_HANDSHAKE_FAILURE;
1289                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1290                                 goto f_err;
1291                                 }
1292                         }
1293
1294                 d = dtls1_set_message_header(s, d,
1295                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1296
1297                 /* we should now have things packed up, so lets send
1298                  * it off */
1299                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1300                 s->init_off=0;
1301
1302                 /* buffer the message to handle re-xmits */
1303                 dtls1_buffer_message(s, 0);
1304                 }
1305
1306         s->state = SSL3_ST_SW_KEY_EXCH_B;
1307         EVP_MD_CTX_cleanup(&md_ctx);
1308         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1309 f_err:
1310         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1311 err:
1312 #ifndef OPENSSL_NO_ECDH
1313         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1314         BN_CTX_free(bn_ctx);
1315 #endif
1316         EVP_MD_CTX_cleanup(&md_ctx);
1317         return(-1);
1318         }
1319
1320 int dtls1_send_certificate_request(SSL *s)
1321         {
1322         unsigned char *p,*d;
1323         int i,j,nl,off,n;
1324         STACK_OF(X509_NAME) *sk=NULL;
1325         X509_NAME *name;
1326         BUF_MEM *buf;
1327         unsigned int msg_len;
1328
1329         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1330                 {
1331                 buf=s->init_buf;
1332
1333                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1334
1335                 /* get the list of acceptable cert types */
1336                 p++;
1337                 n=ssl3_get_req_cert_type(s,p);
1338                 d[0]=n;
1339                 p+=n;
1340                 n++;
1341
1342                 off=n;
1343                 p+=2;
1344                 n+=2;
1345
1346                 sk=SSL_get_client_CA_list(s);
1347                 nl=0;
1348                 if (sk != NULL)
1349                         {
1350                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1351                                 {
1352                                 name=sk_X509_NAME_value(sk,i);
1353                                 j=i2d_X509_NAME(name,NULL);
1354                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1355                                         {
1356                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1357                                         goto err;
1358                                         }
1359                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1360                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1361                                         {
1362                                         s2n(j,p);
1363                                         i2d_X509_NAME(name,&p);
1364                                         n+=2+j;
1365                                         nl+=2+j;
1366                                         }
1367                                 else
1368                                         {
1369                                         d=p;
1370                                         i2d_X509_NAME(name,&p);
1371                                         j-=2; s2n(j,d); j+=2;
1372                                         n+=j;
1373                                         nl+=j;
1374                                         }
1375                                 }
1376                         }
1377                 /* else no CA names */
1378                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1379                 s2n(nl,p);
1380
1381                 d=(unsigned char *)buf->data;
1382                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1383                 l2n3(n,d);
1384                 s2n(s->d1->handshake_write_seq,d);
1385                 s->d1->handshake_write_seq++;
1386
1387                 /* we should now have things packed up, so lets send
1388                  * it off */
1389
1390                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1391                 s->init_off=0;
1392 #ifdef NETSCAPE_HANG_BUG
1393 /* XXX: what to do about this? */
1394                 p=(unsigned char *)s->init_buf->data + s->init_num;
1395
1396                 /* do the header */
1397                 *(p++)=SSL3_MT_SERVER_DONE;
1398                 *(p++)=0;
1399                 *(p++)=0;
1400                 *(p++)=0;
1401                 s->init_num += 4;
1402 #endif
1403
1404                 /* XDTLS:  set message header ? */
1405                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1406                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1407                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1408
1409                 /* buffer the message to handle re-xmits */
1410                 dtls1_buffer_message(s, 0);
1411
1412                 s->state = SSL3_ST_SW_CERT_REQ_B;
1413                 }
1414
1415         /* SSL3_ST_SW_CERT_REQ_B */
1416         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1417 err:
1418         return(-1);
1419         }
1420
1421 int dtls1_send_server_certificate(SSL *s)
1422         {
1423         unsigned long l;
1424         X509 *x;
1425
1426         if (s->state == SSL3_ST_SW_CERT_A)
1427                 {
1428                 x=ssl_get_server_send_cert(s);
1429                 if (x == NULL)
1430                         {
1431                         /* VRS: allow null cert if auth == KRB5 */
1432                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1433                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1434                                 {
1435                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1436                                 return(0);
1437                                 }
1438                         }
1439
1440                 l=dtls1_output_cert_chain(s,x);
1441                 s->state=SSL3_ST_SW_CERT_B;
1442                 s->init_num=(int)l;
1443                 s->init_off=0;
1444
1445                 /* buffer the message to handle re-xmits */
1446                 dtls1_buffer_message(s, 0);
1447                 }
1448
1449         /* SSL3_ST_SW_CERT_B */
1450         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1451         }
1452
1453 #ifndef OPENSSL_NO_TLSEXT
1454 int dtls1_send_newsession_ticket(SSL *s)
1455         {
1456         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1457                 {
1458                 unsigned char *p, *senc, *macstart;
1459                 int len, slen;
1460                 unsigned int hlen, msg_len;
1461                 EVP_CIPHER_CTX ctx;
1462                 HMAC_CTX hctx;
1463                 SSL_CTX *tctx = s->initial_ctx;
1464                 unsigned char iv[EVP_MAX_IV_LENGTH];
1465                 unsigned char key_name[16];
1466
1467                 /* get session encoding length */
1468                 slen = i2d_SSL_SESSION(s->session, NULL);
1469                 /* Some length values are 16 bits, so forget it if session is
1470                  * too long
1471                  */
1472                 if (slen > 0xFF00)
1473                         return -1;
1474                 /* Grow buffer if need be: the length calculation is as
1475                  * follows 12 (DTLS handshake message header) +
1476                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1477                  * 16 (key name) + max_iv_len (iv length) +
1478                  * session_length + max_enc_block_size (max encrypted session
1479                  * length) + max_md_size (HMAC).
1480                  */
1481                 if (!BUF_MEM_grow(s->init_buf,
1482                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1483                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1484                         return -1;
1485                 senc = OPENSSL_malloc(slen);
1486                 if (!senc)
1487                         return -1;
1488                 p = senc;
1489                 i2d_SSL_SESSION(s->session, &p);
1490
1491                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1492                 EVP_CIPHER_CTX_init(&ctx);
1493                 HMAC_CTX_init(&hctx);
1494                 /* Initialize HMAC and cipher contexts. If callback present
1495                  * it does all the work otherwise use generated values
1496                  * from parent ctx.
1497                  */
1498                 if (tctx->tlsext_ticket_key_cb)
1499                         {
1500                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1501                                                          &hctx, 1) < 0)
1502                                 {
1503                                 OPENSSL_free(senc);
1504                                 return -1;
1505                                 }
1506                         }
1507                 else
1508                         {
1509                         RAND_pseudo_bytes(iv, 16);
1510                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1511                                         tctx->tlsext_tick_aes_key, iv);
1512                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1513                                         tlsext_tick_md(), NULL);
1514                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1515                         }
1516                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1517                 /* Skip ticket length for now */
1518                 p += 2;
1519                 /* Output key name */
1520                 macstart = p;
1521                 memcpy(p, key_name, 16);
1522                 p += 16;
1523                 /* output IV */
1524                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1525                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1526                 /* Encrypt session data */
1527                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1528                 p += len;
1529                 EVP_EncryptFinal(&ctx, p, &len);
1530                 p += len;
1531                 EVP_CIPHER_CTX_cleanup(&ctx);
1532
1533                 HMAC_Update(&hctx, macstart, p - macstart);
1534                 HMAC_Final(&hctx, p, &hlen);
1535                 HMAC_CTX_cleanup(&hctx);
1536
1537                 p += hlen;
1538                 /* Now write out lengths: p points to end of data written */
1539                 /* Total length */
1540                 len = p - (unsigned char *)(s->init_buf->data);
1541                 /* Ticket length */
1542                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1543                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1544
1545                 /* number of bytes to write */
1546                 s->init_num= len;
1547                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1548                 s->init_off=0;
1549                 OPENSSL_free(senc);
1550
1551                 /* XDTLS:  set message header ? */
1552                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1553                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1554                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1555
1556                 /* buffer the message to handle re-xmits */
1557                 dtls1_buffer_message(s, 0);
1558                 }
1559
1560         /* SSL3_ST_SW_SESSION_TICKET_B */
1561         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1562         }
1563 #endif