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         long num1;
 151         unsigned long alg_k;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 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         /* init things to blank */
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         if (s->cert == NULL)
 169                 {
 170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 171                 return(-1);
 172                 }
 173
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_RENEGOTIATE:
 181                         s->new_session=1;
 182                         /* s->state=SSL_ST_ACCEPT; */
 183
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_ACCEPT:
 186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 187                 case SSL_ST_OK|SSL_ST_ACCEPT:
 188
 189                         s->server=1;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 193                                 {
 194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 195                                 return -1;
 196                                 }
 197                         s->type=SSL_ST_ACCEPT;
 198
 199                         if (s->init_buf == NULL)
 200                                 {
 201                                 if ((buf=BUF_MEM_new()) == NULL)
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 207                                         {
 208                                         ret= -1;
 209                                         goto end;
 210                                         }
 211                                 s->init_buf=buf;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s))
 215                                 {
 216                                 ret= -1;
 217                                 goto end;
 218                                 }
 219
 220                         s->init_num=0;
 221
 222                         if (s->state != SSL_ST_RENEGOTIATE)
 223                                 {
 224                                 /* Ok, we now need to push on a buffering BIO so that
 225                                  * the output is sent in a way that TCP likes :-)
 226                                  */
 227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 228
 229                                 ssl3_init_finished_mac(s);
 230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 231                                 s->ctx->stats.sess_accept++;
 232                                 }
 233                         else
 234                                 {
 235                                 /* s->state == SSL_ST_RENEGOTIATE,
 236                                  * we will just send a HelloRequest */
 237                                 s->ctx->stats.sess_accept_renegotiate++;
 238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 239                                 }
 240
 241                         break;
 242
 243                 case SSL3_ST_SW_HELLO_REQ_A:
 244                 case SSL3_ST_SW_HELLO_REQ_B:
 245
 246                         s->shutdown=0;
 247                         dtls1_start_timer(s);
 248                         ret=dtls1_send_hello_request(s);
 249                         if (ret <= 0) goto end;
 250                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 251                         s->state=SSL3_ST_SW_FLUSH;
 252                         s->init_num=0;
 253
 254                         ssl3_init_finished_mac(s);
 255                         break;
 256
 257                 case SSL3_ST_SW_HELLO_REQ_C:
 258                         s->state=SSL_ST_OK;
 259                         break;
 260
 261                 case SSL3_ST_SR_CLNT_HELLO_A:
 262                 case SSL3_ST_SR_CLNT_HELLO_B:
 263                 case SSL3_ST_SR_CLNT_HELLO_C:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_get_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         dtls1_stop_timer(s);
 269                         s->new_session = 2;
 270
 271                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 272                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 273                         else
 274                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 275
 276                         s->init_num=0;
 277
 278                         /* If we're just listening, stop here */
 279                         if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 280                                 {
 281                                 ret = 2;
 282                                 s->d1->listen = 0;
 283                                 goto end;
 284                                 }
 285
 286                         break;
 287
 288                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 289                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 290
 291                         dtls1_start_timer(s);
 292                         ret = dtls1_send_hello_verify_request(s);
 293                         if ( ret <= 0) goto end;
 294                         s->state=SSL3_ST_SW_FLUSH;
 295                         s->new_session = 0;
 296                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 297
 298                         /* HelloVerifyRequest resets Finished MAC */
 299                         if (s->version != DTLS1_BAD_VER)
 300                                 ssl3_init_finished_mac(s);
 301                         break;
 302
 303                 case SSL3_ST_SW_SRVR_HELLO_A:
 304                 case SSL3_ST_SW_SRVR_HELLO_B:
 305                         dtls1_start_timer(s);
 306                         ret=dtls1_send_server_hello(s);
 307                         if (ret <= 0) goto end;
 308
 309 #ifndef OPENSSL_NO_TLSEXT
 310                         if (s->hit)
 311                                 {
 312                                 if (s->tlsext_ticket_expected)
 313                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 314                                 else
 315                                         s->state=SSL3_ST_SW_CHANGE_A;
 316                                 }
 317 #else
 318                         if (s->hit)
 319                                         s->state=SSL3_ST_SW_CHANGE_A;
 320 #endif
 321                         else
 322                                 s->state=SSL3_ST_SW_CERT_A;
 323                         s->init_num=0;
 324                         break;
 325
 326                 case SSL3_ST_SW_CERT_A:
 327                 case SSL3_ST_SW_CERT_B:
 328                         /* Check if it is anon DH or normal PSK */
 329                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 330                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 331                                 {
 332                                 dtls1_start_timer(s);
 333                                 ret=dtls1_send_server_certificate(s);
 334                                 if (ret <= 0) goto end;
 335 #ifndef OPENSSL_NO_TLSEXT
 336                                 if (s->tlsext_status_expected)
 337                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 338                                 else
 339                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 340                                 }
 341                         else
 342                                 {
 343                                 skip = 1;
 344                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 345                                 }
 346 #else
 347                                 }
 348                         else
 349                                 skip=1;
 350
 351                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 352 #endif
 353                         s->init_num=0;
 354                         break;
 355
 356                 case SSL3_ST_SW_KEY_EXCH_A:
 357                 case SSL3_ST_SW_KEY_EXCH_B:
 358                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 359
 360                         /* clear this, it may get reset by
 361                          * send_server_key_exchange */
 362                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 363 #ifndef OPENSSL_NO_KRB5
 364                                 && !(alg_k & SSL_kKRB5)
 365 #endif /* OPENSSL_NO_KRB5 */
 366                                 )
 367                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 368                                  * even when forbidden by protocol specs
 369                                  * (handshake may fail as clients are not required to
 370                                  * be able to handle this) */
 371                                 s->s3->tmp.use_rsa_tmp=1;
 372                         else
 373                                 s->s3->tmp.use_rsa_tmp=0;
 374
 375                         /* only send if a DH key exchange or
 376                          * RSA but we have a sign only certificate */
 377                         if (s->s3->tmp.use_rsa_tmp
 378                         /* PSK: send ServerKeyExchange if PSK identity
 379                          * hint if provided */
 380 #ifndef OPENSSL_NO_PSK
 381                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 382 #endif
 383                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 384                             || (alg_k & SSL_kEECDH)
 385                             || ((alg_k & SSL_kRSA)
 386                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 387                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 388                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 389                                         )
 390                                     )
 391                                 )
 392                             )
 393                                 {
 394                                 dtls1_start_timer(s);
 395                                 ret=dtls1_send_server_key_exchange(s);
 396                                 if (ret <= 0) goto end;
 397                                 }
 398                         else
 399                                 skip=1;
 400
 401                         s->state=SSL3_ST_SW_CERT_REQ_A;
 402                         s->init_num=0;
 403                         break;
 404
 405                 case SSL3_ST_SW_CERT_REQ_A:
 406                 case SSL3_ST_SW_CERT_REQ_B:
 407                         if (/* don't request cert unless asked for it: */
 408                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 409                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 410                                  * don't request cert during re-negotiation: */
 411                                 ((s->session->peer != NULL) &&
 412                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 413                                 /* never request cert in anonymous ciphersuites
 414                                  * (see section "Certificate request" in SSL 3 drafts
 415                                  * and in RFC 2246): */
 416                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 417                                  /* ... except when the application insists on verification
 418                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 419                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 420                                  /* never request cert in Kerberos ciphersuites */
 421                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 422                                 /* With normal PSK Certificates and
 423                                  * Certificate Requests are omitted */
 424                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 425                                 {
 426                                 /* no cert request */
 427                                 skip=1;
 428                                 s->s3->tmp.cert_request=0;
 429                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 430                                 }
 431                         else
 432                                 {
 433                                 s->s3->tmp.cert_request=1;
 434                                 dtls1_start_timer(s);
 435                                 ret=dtls1_send_certificate_request(s);
 436                                 if (ret <= 0) goto end;
 437 #ifndef NETSCAPE_HANG_BUG
 438                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 439 #else
 440                                 s->state=SSL3_ST_SW_FLUSH;
 441                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 442 #endif
 443                                 s->init_num=0;
 444                                 }
 445                         break;
 446
 447                 case SSL3_ST_SW_SRVR_DONE_A:
 448                 case SSL3_ST_SW_SRVR_DONE_B:
 449                         dtls1_start_timer(s);
 450                         ret=dtls1_send_server_done(s);
 451                         if (ret <= 0) goto end;
 452                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 453                         s->state=SSL3_ST_SW_FLUSH;
 454                         s->init_num=0;
 455                         break;
 456
 457                 case SSL3_ST_SW_FLUSH:
 458                         /* number of bytes to be flushed */
 459                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 460                         if (num1 > 0)
 461                                 {
 462                                 s->rwstate=SSL_WRITING;
 463                                 num1=BIO_flush(s->wbio);
 464                                 if (num1 <= 0) { ret= -1; goto end; }
 465                                 s->rwstate=SSL_NOTHING;
 466                                 }
 467
 468                         s->state=s->s3->tmp.next_state;
 469                         break;
 470
 471                 case SSL3_ST_SR_CERT_A:
 472                 case SSL3_ST_SR_CERT_B:
 473                         /* Check for second client hello (MS SGC) */
 474                         ret = ssl3_check_client_hello(s);
 475                         if (ret <= 0)
 476                                 goto end;
 477                         dtls1_stop_timer(s);
 478                         if (ret == 2)
 479                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 480                         else {
 481                                 /* could be sent for a DH cert, even if we
 482                                  * have not asked for it :-) */
 483                                 ret=ssl3_get_client_certificate(s);
 484                                 if (ret <= 0) goto end;
 485                                 dtls1_stop_timer(s);
 486                                 s->init_num=0;
 487                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 488                         }
 489                         break;
 490
 491                 case SSL3_ST_SR_KEY_EXCH_A:
 492                 case SSL3_ST_SR_KEY_EXCH_B:
 493                         ret=ssl3_get_client_key_exchange(s);
 494                         if (ret <= 0) goto end;
 495                         dtls1_stop_timer(s);
 496                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 497                         s->init_num=0;
 498
 499                         if (ret == 2)
 500                                 {
 501                                 /* For the ECDH ciphersuites when
 502                                  * the client sends its ECDH pub key in
 503                                  * a certificate, the CertificateVerify
 504                                  * message is not sent.
 505                                  */
 506                                 s->state=SSL3_ST_SR_FINISHED_A;
 507                                 s->init_num = 0;
 508                                 }
 509                         else
 510                                 {
 511                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 512                                 s->init_num=0;
 513
 514                                 /* We need to get hashes here so if there is
 515                                  * a client cert, it can be verified */
 516                                 s->method->ssl3_enc->cert_verify_mac(s,
 517                                         NID_md5,
 518                                         &(s->s3->tmp.cert_verify_md[0]));
 519                                 s->method->ssl3_enc->cert_verify_mac(s,
 520                                         NID_sha1,
 521                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 522                                 }
 523                         break;
 524
 525                 case SSL3_ST_SR_CERT_VRFY_A:
 526                 case SSL3_ST_SR_CERT_VRFY_B:
 527
 528                         s->d1->change_cipher_spec_ok = 1;
 529                         /* we should decide if we expected this one */
 530                         ret=ssl3_get_cert_verify(s);
 531                         if (ret <= 0) goto end;
 532                         dtls1_stop_timer(s);
 533
 534                         s->state=SSL3_ST_SR_FINISHED_A;
 535                         s->init_num=0;
 536                         break;
 537
 538                 case SSL3_ST_SR_FINISHED_A:
 539                 case SSL3_ST_SR_FINISHED_B:
 540                         s->d1->change_cipher_spec_ok = 1;
 541                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 542                                 SSL3_ST_SR_FINISHED_B);
 543                         if (ret <= 0) goto end;
 544                         dtls1_stop_timer(s);
 545                         if (s->hit)
 546                                 s->state=SSL_ST_OK;
 547 #ifndef OPENSSL_NO_TLSEXT
 548                         else if (s->tlsext_ticket_expected)
 549                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 550 #endif
 551                         else
 552                                 s->state=SSL3_ST_SW_CHANGE_A;
 553                         s->init_num=0;
 554                         break;
 555
 556 #ifndef OPENSSL_NO_TLSEXT
 557                 case SSL3_ST_SW_SESSION_TICKET_A:
 558                 case SSL3_ST_SW_SESSION_TICKET_B:
 559                         ret=dtls1_send_newsession_ticket(s);
 560                         if (ret <= 0) goto end;
 561                         s->state=SSL3_ST_SW_CHANGE_A;
 562                         s->init_num=0;
 563                         break;
 564
 565                 case SSL3_ST_SW_CERT_STATUS_A:
 566                 case SSL3_ST_SW_CERT_STATUS_B:
 567                         ret=ssl3_send_cert_status(s);
 568                         if (ret <= 0) goto end;
 569                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 570                         s->init_num=0;
 571                         break;
 572
 573 #endif
 574
 575                 case SSL3_ST_SW_CHANGE_A:
 576                 case SSL3_ST_SW_CHANGE_B:
 577
 578                         s->session->cipher=s->s3->tmp.new_cipher;
 579                         if (!s->method->ssl3_enc->setup_key_block(s))
 580                                 { ret= -1; goto end; }
 581
 582                         ret=dtls1_send_change_cipher_spec(s,
 583                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 584
 585                         if (ret <= 0) goto end;
 586                         s->state=SSL3_ST_SW_FINISHED_A;
 587                         s->init_num=0;
 588
 589                         if (!s->method->ssl3_enc->change_cipher_state(s,
 590                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 591                                 {
 592                                 ret= -1;
 593                                 goto end;
 594                                 }
 595
 596                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 597                         break;
 598
 599                 case SSL3_ST_SW_FINISHED_A:
 600                 case SSL3_ST_SW_FINISHED_B:
 601                         ret=dtls1_send_finished(s,
 602                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 603                                 s->method->ssl3_enc->server_finished_label,
 604                                 s->method->ssl3_enc->server_finished_label_len);
 605                         if (ret <= 0) goto end;
 606                         s->state=SSL3_ST_SW_FLUSH;
 607                         if (s->hit)
 608                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 609                         else
 610                                 s->s3->tmp.next_state=SSL_ST_OK;
 611                         s->init_num=0;
 612                         break;
 613
 614                 case SSL_ST_OK:
 615                         /* clean a few things up */
 616                         ssl3_cleanup_key_block(s);
 617
 618 #if 0
 619                         BUF_MEM_free(s->init_buf);
 620                         s->init_buf=NULL;
 621 #endif
 622
 623                         /* remove buffering on output */
 624                         ssl_free_wbio_buffer(s);
 625
 626                         s->init_num=0;
 627
 628                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 629                                 {
 630                                 /* actually not necessarily a 'new' session unless
 631                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 632
 633                                 s->new_session=0;
 634
 635                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 636
 637                                 s->ctx->stats.sess_accept_good++;
 638                                 /* s->server=1; */
 639                                 s->handshake_func=dtls1_accept;
 640
 641                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 642                                 }
 643
 644                         ret = 1;
 645
 646                         /* done handshaking, next message is client hello */
 647                         s->d1->handshake_read_seq = 0;
 648                         /* next message is server hello */
 649                         s->d1->handshake_write_seq = 0;
 650                         s->d1->next_handshake_write_seq = 0;
 651                         goto end;
 652                         /* break; */
 653
 654                 default:
 655                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 656                         ret= -1;
 657                         goto end;
 658                         /* break; */
 659                         }
 660
 661                 if (!s->s3->tmp.reuse_message && !skip)
 662                         {
 663                         if (s->debug)
 664                                 {
 665                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 666                                         goto end;
 667                                 }
 668
 669
 670                         if ((cb != NULL) && (s->state != state))
 671                                 {
 672                                 new_state=s->state;
 673                                 s->state=state;
 674                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 675                                 s->state=new_state;
 676                                 }
 677                         }
 678                 skip=0;
 679                 }
 680 end:
 681         /* BIO_flush(s->wbio); */
 682
 683         s->in_handshake--;
 684         if (cb != NULL)
 685                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 686         return(ret);
 687         }
 688
 689 int dtls1_send_hello_request(SSL *s)
 690         {
 691         unsigned char *p;
 692
 693         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 694                 {
 695                 p=(unsigned char *)s->init_buf->data;
 696                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 697
 698                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 699                 /* number of bytes to write */
 700                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 701                 s->init_off=0;
 702
 703                 /* no need to buffer this message, since there are no retransmit
 704                  * requests for it */
 705                 }
 706
 707         /* SSL3_ST_SW_HELLO_REQ_B */
 708         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 709         }
 710
 711 int dtls1_send_hello_verify_request(SSL *s)
 712         {
 713         unsigned int msg_len;
 714         unsigned char *msg, *buf, *p;
 715
 716         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 717                 {
 718                 buf = (unsigned char *)s->init_buf->data;
 719
 720                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 721                 *(p++) = s->version >> 8;
 722                 *(p++) = s->version & 0xFF;
 723
 724                 if (s->ctx->app_gen_cookie_cb == NULL ||
 725                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 726                          &(s->d1->cookie_len)) == 0)
 727                         {
 728                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 729                         return 0;
 730                         }
 731
 732                 *(p++) = (unsigned char) s->d1->cookie_len;
 733                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 734                 p += s->d1->cookie_len;
 735                 msg_len = p - msg;
 736
 737                 dtls1_set_message_header(s, buf,
 738                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 739
 740                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 741                 /* number of bytes to write */
 742                 s->init_num=p-buf;
 743                 s->init_off=0;
 744
 745                 /* buffer the message to handle re-xmits */
 746                 dtls1_buffer_message(s, 0);
 747                 }
 748
 749         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 750         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 751         }
 752
 753 int dtls1_send_server_hello(SSL *s)
 754         {
 755         unsigned char *buf;
 756         unsigned char *p,*d;
 757         int i;
 758         unsigned int sl;
 759         unsigned long l,Time;
 760
 761         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 762                 {
 763                 buf=(unsigned char *)s->init_buf->data;
 764                 p=s->s3->server_random;
 765                 Time=(unsigned long)time(NULL);                 /* Time */
 766                 l2n(Time,p);
 767                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 768                 /* Do the message type and length last */
 769                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 770
 771                 *(p++)=s->version>>8;
 772                 *(p++)=s->version&0xff;
 773
 774                 /* Random stuff */
 775                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 776                 p+=SSL3_RANDOM_SIZE;
 777
 778                 /* now in theory we have 3 options to sending back the
 779                  * session id.  If it is a re-use, we send back the
 780                  * old session-id, if it is a new session, we send
 781                  * back the new session-id or we send back a 0 length
 782                  * session-id if we want it to be single use.
 783                  * Currently I will not implement the '0' length session-id
 784                  * 12-Jan-98 - I'll now support the '0' length stuff.
 785                  */
 786                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 787                         s->session->session_id_length=0;
 788
 789                 sl=s->session->session_id_length;
 790                 if (sl > sizeof s->session->session_id)
 791                         {
 792                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 793                         return -1;
 794                         }
 795                 *(p++)=sl;
 796                 memcpy(p,s->session->session_id,sl);
 797                 p+=sl;
 798
 799                 /* put the cipher */
 800                 if (s->s3->tmp.new_cipher == NULL)
 801                         return -1;
 802                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 803                 p+=i;
 804
 805                 /* put the compression method */
 806 #ifdef OPENSSL_NO_COMP
 807                 *(p++)=0;
 808 #else
 809                 if (s->s3->tmp.new_compression == NULL)
 810                         *(p++)=0;
 811                 else
 812                         *(p++)=s->s3->tmp.new_compression->id;
 813 #endif
 814
 815 #ifndef OPENSSL_NO_TLSEXT
 816                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 817                         {
 818                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 819                         return -1;
 820                         }
 821 #endif
 822
 823                 /* do the header */
 824                 l=(p-d);
 825                 d=buf;
 826
 827                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 828
 829                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 830                 /* number of bytes to write */
 831                 s->init_num=p-buf;
 832                 s->init_off=0;
 833
 834                 /* buffer the message to handle re-xmits */
 835                 dtls1_buffer_message(s, 0);
 836                 }
 837
 838         /* SSL3_ST_SW_SRVR_HELLO_B */
 839         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 840         }
 841
 842 int dtls1_send_server_done(SSL *s)
 843         {
 844         unsigned char *p;
 845
 846         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 847                 {
 848                 p=(unsigned char *)s->init_buf->data;
 849
 850                 /* do the header */
 851                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 852
 853                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 854                 /* number of bytes to write */
 855                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 856                 s->init_off=0;
 857
 858                 /* buffer the message to handle re-xmits */
 859                 dtls1_buffer_message(s, 0);
 860                 }
 861
 862         /* SSL3_ST_SW_SRVR_DONE_B */
 863         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 864         }
 865
 866 int dtls1_send_server_key_exchange(SSL *s)
 867         {
 868 #ifndef OPENSSL_NO_RSA
 869         unsigned char *q;
 870         int j,num;
 871         RSA *rsa;
 872         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 873         unsigned int u;
 874 #endif
 875 #ifndef OPENSSL_NO_DH
 876         DH *dh=NULL,*dhp;
 877 #endif
 878 #ifndef OPENSSL_NO_ECDH
 879         EC_KEY *ecdh=NULL, *ecdhp;
 880         unsigned char *encodedPoint = NULL;
 881         int encodedlen = 0;
 882         int curve_id = 0;
 883         BN_CTX *bn_ctx = NULL;
 884 #endif
 885         EVP_PKEY *pkey;
 886         unsigned char *p,*d;
 887         int al,i;
 888         unsigned long type;
 889         int n;
 890         CERT *cert;
 891         BIGNUM *r[4];
 892         int nr[4],kn;
 893         BUF_MEM *buf;
 894         EVP_MD_CTX md_ctx;
 895
 896         EVP_MD_CTX_init(&md_ctx);
 897         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 898                 {
 899                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 900                 cert=s->cert;
 901
 902                 buf=s->init_buf;
 903
 904                 r[0]=r[1]=r[2]=r[3]=NULL;
 905                 n=0;
 906 #ifndef OPENSSL_NO_RSA
 907                 if (type & SSL_kRSA)
 908                         {
 909                         rsa=cert->rsa_tmp;
 910                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 911                                 {
 912                                 rsa=s->cert->rsa_tmp_cb(s,
 913                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 914                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 915                                 if(rsa == NULL)
 916                                 {
 917                                         al=SSL_AD_HANDSHAKE_FAILURE;
 918                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 919                                         goto f_err;
 920                                 }
 921                                 RSA_up_ref(rsa);
 922                                 cert->rsa_tmp=rsa;
 923                                 }
 924                         if (rsa == NULL)
 925                                 {
 926                                 al=SSL_AD_HANDSHAKE_FAILURE;
 927                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 928                                 goto f_err;
 929                                 }
 930                         r[0]=rsa->n;
 931                         r[1]=rsa->e;
 932                         s->s3->tmp.use_rsa_tmp=1;
 933                         }
 934                 else
 935 #endif
 936 #ifndef OPENSSL_NO_DH
 937                         if (type & SSL_kEDH)
 938                         {
 939                         dhp=cert->dh_tmp;
 940                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 941                                 dhp=s->cert->dh_tmp_cb(s,
 942                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 943                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 944                         if (dhp == NULL)
 945                                 {
 946                                 al=SSL_AD_HANDSHAKE_FAILURE;
 947                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 948                                 goto f_err;
 949                                 }
 950
 951                         if (s->s3->tmp.dh != NULL)
 952                                 {
 953                                 DH_free(dh);
 954                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 955                                 goto err;
 956                                 }
 957
 958                         if ((dh=DHparams_dup(dhp)) == NULL)
 959                                 {
 960                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 961                                 goto err;
 962                                 }
 963
 964                         s->s3->tmp.dh=dh;
 965                         if ((dhp->pub_key == NULL ||
 966                              dhp->priv_key == NULL ||
 967                              (s->options & SSL_OP_SINGLE_DH_USE)))
 968                                 {
 969                                 if(!DH_generate_key(dh))
 970                                     {
 971                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 972                                            ERR_R_DH_LIB);
 973                                     goto err;
 974                                     }
 975                                 }
 976                         else
 977                                 {
 978                                 dh->pub_key=BN_dup(dhp->pub_key);
 979                                 dh->priv_key=BN_dup(dhp->priv_key);
 980                                 if ((dh->pub_key == NULL) ||
 981                                         (dh->priv_key == NULL))
 982                                         {
 983                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 984                                         goto err;
 985                                         }
 986                                 }
 987                         r[0]=dh->p;
 988                         r[1]=dh->g;
 989                         r[2]=dh->pub_key;
 990                         }
 991                 else
 992 #endif
 993 #ifndef OPENSSL_NO_ECDH
 994                         if (type & SSL_kEECDH)
 995                         {
 996                         const EC_GROUP *group;
 997
 998                         ecdhp=cert->ecdh_tmp;
 999                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1000                                 {
1001                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1002                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1003                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1004                                 }
1005                         if (ecdhp == NULL)
1006                                 {
1007                                 al=SSL_AD_HANDSHAKE_FAILURE;
1008                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1009                                 goto f_err;
1010                                 }
1011
1012                         if (s->s3->tmp.ecdh != NULL)
1013                                 {
1014                                 EC_KEY_free(s->s3->tmp.ecdh);
1015                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1016                                 goto err;
1017                                 }
1018
1019                         /* Duplicate the ECDH structure. */
1020                         if (ecdhp == NULL)
1021                                 {
1022                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1023                                 goto err;
1024                                 }
1025                         if (!EC_KEY_up_ref(ecdhp))
1026                                 {
1027                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1028                                 goto err;
1029                                 }
1030                         ecdh = ecdhp;
1031
1032                         s->s3->tmp.ecdh=ecdh;
1033                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1034                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1035                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1036                                 {
1037                                 if(!EC_KEY_generate_key(ecdh))
1038                                     {
1039                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1040                                     goto err;
1041                                     }
1042                                 }
1043
1044                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1045                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1046                             (EC_KEY_get0_private_key(ecdh) == NULL))
1047                                 {
1048                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1049                                 goto err;
1050                                 }
1051
1052                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1053                             (EC_GROUP_get_degree(group) > 163))
1054                                 {
1055                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1056                                 goto err;
1057                                 }
1058
1059                         /* XXX: For now, we only support ephemeral ECDH
1060                          * keys over named (not generic) curves. For
1061                          * supported named curves, curve_id is non-zero.
1062                          */
1063                         if ((curve_id =
1064                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1065                             == 0)
1066                                 {
1067                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1068                                 goto err;
1069                                 }
1070
1071                         /* Encode the public key.
1072                          * First check the size of encoding and
1073                          * allocate memory accordingly.
1074                          */
1075                         encodedlen = EC_POINT_point2oct(group,
1076                             EC_KEY_get0_public_key(ecdh),
1077                             POINT_CONVERSION_UNCOMPRESSED,
1078                             NULL, 0, NULL);
1079
1080                         encodedPoint = (unsigned char *)
1081                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1082                         bn_ctx = BN_CTX_new();
1083                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1084                                 {
1085                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1086                                 goto err;
1087                                 }
1088
1089
1090                         encodedlen = EC_POINT_point2oct(group,
1091                             EC_KEY_get0_public_key(ecdh),
1092                             POINT_CONVERSION_UNCOMPRESSED,
1093                             encodedPoint, encodedlen, bn_ctx);
1094
1095                         if (encodedlen == 0)
1096                                 {
1097                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1098                                 goto err;
1099                                 }
1100
1101                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1102
1103                         /* XXX: For now, we only support named (not
1104                          * generic) curves in ECDH ephemeral key exchanges.
1105                          * In this situation, we need four additional bytes
1106                          * to encode the entire ServerECDHParams
1107                          * structure.
1108                          */
1109                         n = 4 + encodedlen;
1110
1111                         /* We'll generate the serverKeyExchange message
1112                          * explicitly so we can set these to NULLs
1113                          */
1114                         r[0]=NULL;
1115                         r[1]=NULL;
1116                         r[2]=NULL;
1117                         r[3]=NULL;
1118                         }
1119                 else
1120 #endif /* !OPENSSL_NO_ECDH */
1121 #ifndef OPENSSL_NO_PSK
1122                         if (type & SSL_kPSK)
1123                                 {
1124                                 /* reserve size for record length and PSK identity hint*/
1125                                 n+=2+strlen(s->ctx->psk_identity_hint);
1126                                 }
1127                         else
1128 #endif /* !OPENSSL_NO_PSK */
1129                         {
1130                         al=SSL_AD_HANDSHAKE_FAILURE;
1131                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1132                         goto f_err;
1133                         }
1134                 for (i=0; r[i] != NULL; i++)
1135                         {
1136                         nr[i]=BN_num_bytes(r[i]);
1137                         n+=2+nr[i];
1138                         }
1139
1140                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1141                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1142                         {
1143                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1144                                 == NULL)
1145                                 {
1146                                 al=SSL_AD_DECODE_ERROR;
1147                                 goto f_err;
1148                                 }
1149                         kn=EVP_PKEY_size(pkey);
1150                         }
1151                 else
1152                         {
1153                         pkey=NULL;
1154                         kn=0;
1155                         }
1156
1157                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1158                         {
1159                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1160                         goto err;
1161                         }
1162                 d=(unsigned char *)s->init_buf->data;
1163                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1164
1165                 for (i=0; r[i] != NULL; i++)
1166                         {
1167                         s2n(nr[i],p);
1168                         BN_bn2bin(r[i],p);
1169                         p+=nr[i];
1170                         }
1171
1172 #ifndef OPENSSL_NO_ECDH
1173                 if (type & SSL_kEECDH)
1174                         {
1175                         /* XXX: For now, we only support named (not generic) curves.
1176                          * In this situation, the serverKeyExchange message has:
1177                          * [1 byte CurveType], [2 byte CurveName]
1178                          * [1 byte length of encoded point], followed by
1179                          * the actual encoded point itself
1180                          */
1181                         *p = NAMED_CURVE_TYPE;
1182                         p += 1;
1183                         *p = 0;
1184                         p += 1;
1185                         *p = curve_id;
1186                         p += 1;
1187                         *p = encodedlen;
1188                         p += 1;
1189                         memcpy((unsigned char*)p,
1190                             (unsigned char *)encodedPoint,
1191                             encodedlen);
1192                         OPENSSL_free(encodedPoint);
1193                         p += encodedlen;
1194                         }
1195 #endif
1196
1197 #ifndef OPENSSL_NO_PSK
1198                 if (type & SSL_kPSK)
1199                         {
1200                         /* copy PSK identity hint */
1201                         s2n(strlen(s->ctx->psk_identity_hint), p);
1202                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1203                         p+=strlen(s->ctx->psk_identity_hint);
1204                         }
1205 #endif
1206
1207                 /* not anonymous */
1208                 if (pkey != NULL)
1209                         {
1210                         /* n is the length of the params, they start at
1211                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1212                          * at the end. */
1213 #ifndef OPENSSL_NO_RSA
1214                         if (pkey->type == EVP_PKEY_RSA)
1215                                 {
1216                                 q=md_buf;
1217                                 j=0;
1218                                 for (num=2; num > 0; num--)
1219                                         {
1220                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1221                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1222                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1223                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1224                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1225                                         EVP_DigestFinal_ex(&md_ctx,q,
1226                                                 (unsigned int *)&i);
1227                                         q+=i;
1228                                         j+=i;
1229                                         }
1230                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1231                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1232                                         {
1233                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1234                                         goto err;
1235                                         }
1236                                 s2n(u,p);
1237                                 n+=u+2;
1238                                 }
1239                         else
1240 #endif
1241 #if !defined(OPENSSL_NO_DSA)
1242                                 if (pkey->type == EVP_PKEY_DSA)
1243                                 {
1244                                 /* lets do DSS */
1245                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1246                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1247                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1248                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1249                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1250                                         (unsigned int *)&i,pkey))
1251                                         {
1252                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1253                                         goto err;
1254                                         }
1255                                 s2n(i,p);
1256                                 n+=i+2;
1257                                 }
1258                         else
1259 #endif
1260 #if !defined(OPENSSL_NO_ECDSA)
1261                                 if (pkey->type == EVP_PKEY_EC)
1262                                 {
1263                                 /* let's do ECDSA */
1264                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1265                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1266                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1267                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1268                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1269                                         (unsigned int *)&i,pkey))
1270                                         {
1271                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1272                                         goto err;
1273                                         }
1274                                 s2n(i,p);
1275                                 n+=i+2;
1276                                 }
1277                         else
1278 #endif
1279                                 {
1280                                 /* Is this error check actually needed? */
1281                                 al=SSL_AD_HANDSHAKE_FAILURE;
1282                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1283                                 goto f_err;
1284                                 }
1285                         }
1286
1287                 d = dtls1_set_message_header(s, d,
1288                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1289
1290                 /* we should now have things packed up, so lets send
1291                  * it off */
1292                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1293                 s->init_off=0;
1294
1295                 /* buffer the message to handle re-xmits */
1296                 dtls1_buffer_message(s, 0);
1297                 }
1298
1299         s->state = SSL3_ST_SW_KEY_EXCH_B;
1300         EVP_MD_CTX_cleanup(&md_ctx);
1301         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1302 f_err:
1303         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1304 err:
1305 #ifndef OPENSSL_NO_ECDH
1306         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1307         BN_CTX_free(bn_ctx);
1308 #endif
1309         EVP_MD_CTX_cleanup(&md_ctx);
1310         return(-1);
1311         }
1312
1313 int dtls1_send_certificate_request(SSL *s)
1314         {
1315         unsigned char *p,*d;
1316         int i,j,nl,off,n;
1317         STACK_OF(X509_NAME) *sk=NULL;
1318         X509_NAME *name;
1319         BUF_MEM *buf;
1320         unsigned int msg_len;
1321
1322         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1323                 {
1324                 buf=s->init_buf;
1325
1326                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1327
1328                 /* get the list of acceptable cert types */
1329                 p++;
1330                 n=ssl3_get_req_cert_type(s,p);
1331                 d[0]=n;
1332                 p+=n;
1333                 n++;
1334
1335                 off=n;
1336                 p+=2;
1337                 n+=2;
1338
1339                 sk=SSL_get_client_CA_list(s);
1340                 nl=0;
1341                 if (sk != NULL)
1342                         {
1343                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1344                                 {
1345                                 name=sk_X509_NAME_value(sk,i);
1346                                 j=i2d_X509_NAME(name,NULL);
1347                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1348                                         {
1349                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1350                                         goto err;
1351                                         }
1352                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1353                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1354                                         {
1355                                         s2n(j,p);
1356                                         i2d_X509_NAME(name,&p);
1357                                         n+=2+j;
1358                                         nl+=2+j;
1359                                         }
1360                                 else
1361                                         {
1362                                         d=p;
1363                                         i2d_X509_NAME(name,&p);
1364                                         j-=2; s2n(j,d); j+=2;
1365                                         n+=j;
1366                                         nl+=j;
1367                                         }
1368                                 }
1369                         }
1370                 /* else no CA names */
1371                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1372                 s2n(nl,p);
1373
1374                 d=(unsigned char *)buf->data;
1375                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1376                 l2n3(n,d);
1377                 s2n(s->d1->handshake_write_seq,d);
1378                 s->d1->handshake_write_seq++;
1379
1380                 /* we should now have things packed up, so lets send
1381                  * it off */
1382
1383                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1384                 s->init_off=0;
1385 #ifdef NETSCAPE_HANG_BUG
1386 /* XXX: what to do about this? */
1387                 p=(unsigned char *)s->init_buf->data + s->init_num;
1388
1389                 /* do the header */
1390                 *(p++)=SSL3_MT_SERVER_DONE;
1391                 *(p++)=0;
1392                 *(p++)=0;
1393                 *(p++)=0;
1394                 s->init_num += 4;
1395 #endif
1396
1397                 /* XDTLS:  set message header ? */
1398                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1399                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1400                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1401
1402                 /* buffer the message to handle re-xmits */
1403                 dtls1_buffer_message(s, 0);
1404
1405                 s->state = SSL3_ST_SW_CERT_REQ_B;
1406                 }
1407
1408         /* SSL3_ST_SW_CERT_REQ_B */
1409         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1410 err:
1411         return(-1);
1412         }
1413
1414 int dtls1_send_server_certificate(SSL *s)
1415         {
1416         unsigned long l;
1417         X509 *x;
1418
1419         if (s->state == SSL3_ST_SW_CERT_A)
1420                 {
1421                 x=ssl_get_server_send_cert(s);
1422                 if (x == NULL)
1423                         {
1424                         /* VRS: allow null cert if auth == KRB5 */
1425                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1426                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1427                                 {
1428                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1429                                 return(0);
1430                                 }
1431                         }
1432
1433                 l=dtls1_output_cert_chain(s,x);
1434                 s->state=SSL3_ST_SW_CERT_B;
1435                 s->init_num=(int)l;
1436                 s->init_off=0;
1437
1438                 /* buffer the message to handle re-xmits */
1439                 dtls1_buffer_message(s, 0);
1440                 }
1441
1442         /* SSL3_ST_SW_CERT_B */
1443         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1444         }
1445
1446 #ifndef OPENSSL_NO_TLSEXT
1447 int dtls1_send_newsession_ticket(SSL *s)
1448         {
1449         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1450                 {
1451                 unsigned char *p, *senc, *macstart;
1452                 int len, slen;
1453                 unsigned int hlen, msg_len;
1454                 EVP_CIPHER_CTX ctx;
1455                 HMAC_CTX hctx;
1456                 SSL_CTX *tctx = s->initial_ctx;
1457                 unsigned char iv[EVP_MAX_IV_LENGTH];
1458                 unsigned char key_name[16];
1459
1460                 /* get session encoding length */
1461                 slen = i2d_SSL_SESSION(s->session, NULL);
1462                 /* Some length values are 16 bits, so forget it if session is
1463                  * too long
1464                  */
1465                 if (slen > 0xFF00)
1466                         return -1;
1467                 /* Grow buffer if need be: the length calculation is as
1468                  * follows 12 (DTLS handshake message header) +
1469                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1470                  * 16 (key name) + max_iv_len (iv length) +
1471                  * session_length + max_enc_block_size (max encrypted session
1472                  * length) + max_md_size (HMAC).
1473                  */
1474                 if (!BUF_MEM_grow(s->init_buf,
1475                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1476                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1477                         return -1;
1478                 senc = OPENSSL_malloc(slen);
1479                 if (!senc)
1480                         return -1;
1481                 p = senc;
1482                 i2d_SSL_SESSION(s->session, &p);
1483
1484                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1485                 EVP_CIPHER_CTX_init(&ctx);
1486                 HMAC_CTX_init(&hctx);
1487                 /* Initialize HMAC and cipher contexts. If callback present
1488                  * it does all the work otherwise use generated values
1489                  * from parent ctx.
1490                  */
1491                 if (tctx->tlsext_ticket_key_cb)
1492                         {
1493                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1494                                                          &hctx, 1) < 0)
1495                                 {
1496                                 OPENSSL_free(senc);
1497                                 return -1;
1498                                 }
1499                         }
1500                 else
1501                         {
1502                         RAND_pseudo_bytes(iv, 16);
1503                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1504                                         tctx->tlsext_tick_aes_key, iv);
1505                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1506                                         tlsext_tick_md(), NULL);
1507                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1508                         }
1509                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1510                 /* Skip ticket length for now */
1511                 p += 2;
1512                 /* Output key name */
1513                 macstart = p;
1514                 memcpy(p, key_name, 16);
1515                 p += 16;
1516                 /* output IV */
1517                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1518                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1519                 /* Encrypt session data */
1520                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1521                 p += len;
1522                 EVP_EncryptFinal(&ctx, p, &len);
1523                 p += len;
1524                 EVP_CIPHER_CTX_cleanup(&ctx);
1525
1526                 HMAC_Update(&hctx, macstart, p - macstart);
1527                 HMAC_Final(&hctx, p, &hlen);
1528                 HMAC_CTX_cleanup(&hctx);
1529
1530                 p += hlen;
1531                 /* Now write out lengths: p points to end of data written */
1532                 /* Total length */
1533                 len = p - (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1534                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1535                 s2n(len - 18, p);  /* Ticket length */
1536
1537                 /* number of bytes to write */
1538                 s->init_num= len;
1539                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1540                 s->init_off=0;
1541                 OPENSSL_free(senc);
1542
1543                 /* XDTLS:  set message header ? */
1544                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1545                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1546                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1547
1548                 /* buffer the message to handle re-xmits */
1549                 dtls1_buffer_message(s, 0);
1550                 }
1551
1552         /* SSL3_ST_SW_SESSION_TICKET_B */
1553         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1554         }
1555 #endif