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