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