ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         unsigned long alg_k;
 151         int ret= -1;
 152         int new_state,state,skip=0;
 153         int listen;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         listen = s->d1->listen;
 165
 166         /* init things to blank */
 167         s->in_handshake++;
 168         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 169
 170         s->d1->listen = listen;
 171
 172         if (s->cert == NULL)
 173                 {
 174                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 175                 return(-1);
 176                 }
 177
 178         for (;;)
 179                 {
 180                 state=s->state;
 181
 182                 switch (s->state)
 183                         {
 184                 case SSL_ST_RENEGOTIATE:
 185                         s->renegotiate=1;
 186                         /* s->state=SSL_ST_ACCEPT; */
 187
 188                 case SSL_ST_BEFORE:
 189                 case SSL_ST_ACCEPT:
 190                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 191                 case SSL_ST_OK|SSL_ST_ACCEPT:
 192
 193                         s->server=1;
 194                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 195
 196                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 197                                 {
 198                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 199                                 return -1;
 200                                 }
 201                         s->type=SSL_ST_ACCEPT;
 202
 203                         if (s->init_buf == NULL)
 204                                 {
 205                                 if ((buf=BUF_MEM_new()) == NULL)
 206                                         {
 207                                         ret= -1;
 208                                         goto end;
 209                                         }
 210                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 211                                         {
 212                                         ret= -1;
 213                                         goto end;
 214                                         }
 215                                 s->init_buf=buf;
 216                                 }
 217
 218                         if (!ssl3_setup_buffers(s))
 219                                 {
 220                                 ret= -1;
 221                                 goto end;
 222                                 }
 223
 224                         s->init_num=0;
 225
 226                         if (s->state != SSL_ST_RENEGOTIATE)
 227                                 {
 228                                 /* Ok, we now need to push on a buffering BIO so that
 229                                  * the output is sent in a way that TCP likes :-)
 230                                  */
 231                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 232
 233                                 ssl3_init_finished_mac(s);
 234                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 235                                 s->ctx->stats.sess_accept++;
 236                                 }
 237                         else
 238                                 {
 239                                 /* s->state == SSL_ST_RENEGOTIATE,
 240                                  * we will just send a HelloRequest */
 241                                 s->ctx->stats.sess_accept_renegotiate++;
 242                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 243                                 }
 244
 245                         break;
 246
 247                 case SSL3_ST_SW_HELLO_REQ_A:
 248                 case SSL3_ST_SW_HELLO_REQ_B:
 249
 250                         s->shutdown=0;
 251                         dtls1_start_timer(s);
 252                         ret=dtls1_send_hello_request(s);
 253                         if (ret <= 0) goto end;
 254                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 255                         s->state=SSL3_ST_SW_FLUSH;
 256                         s->init_num=0;
 257
 258                         ssl3_init_finished_mac(s);
 259                         break;
 260
 261                 case SSL3_ST_SW_HELLO_REQ_C:
 262                         s->state=SSL_ST_OK;
 263                         break;
 264
 265                 case SSL3_ST_SR_CLNT_HELLO_A:
 266                 case SSL3_ST_SR_CLNT_HELLO_B:
 267                 case SSL3_ST_SR_CLNT_HELLO_C:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_get_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         dtls1_stop_timer(s);
 273
 274                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 275                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 276                         else
 277                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 278
 279                         s->init_num=0;
 280
 281                         /* Reflect ClientHello sequence to remain stateless while listening */
 282                         if (listen)
 283                                 {
 284                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
 285                                 }
 286
 287                         /* If we're just listening, stop here */
 288                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 289                                 {
 290                                 ret = 2;
 291                                 s->d1->listen = 0;
 292                                 /* Set expected sequence numbers
 293                                  * to continue the handshake.
 294                                  */
 295                                 s->d1->handshake_read_seq = 2;
 296                                 s->d1->handshake_write_seq = 1;
 297                                 s->d1->next_handshake_write_seq = 1;
 298                                 goto end;
 299                                 }
 300
 301                         break;
 302
 303                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 304                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 305
 306                         ret = dtls1_send_hello_verify_request(s);
 307                         if ( ret <= 0) goto end;
 308                         s->state=SSL3_ST_SW_FLUSH;
 309                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 310
 311                         /* HelloVerifyRequest resets Finished MAC */
 312                         if (s->version != DTLS1_BAD_VER)
 313                                 ssl3_init_finished_mac(s);
 314                         break;
 315
 316                 case SSL3_ST_SW_SRVR_HELLO_A:
 317                 case SSL3_ST_SW_SRVR_HELLO_B:
 318                         s->renegotiate = 2;
 319                         dtls1_start_timer(s);
 320                         ret=dtls1_send_server_hello(s);
 321                         if (ret <= 0) goto end;
 322
 323 #ifndef OPENSSL_NO_TLSEXT
 324                         if (s->hit)
 325                                 {
 326                                 if (s->tlsext_ticket_expected)
 327                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 328                                 else
 329                                         s->state=SSL3_ST_SW_CHANGE_A;
 330                                 }
 331 #else
 332                         if (s->hit)
 333                                         s->state=SSL3_ST_SW_CHANGE_A;
 334 #endif
 335                         else
 336                                 s->state=SSL3_ST_SW_CERT_A;
 337                         s->init_num=0;
 338                         break;
 339
 340                 case SSL3_ST_SW_CERT_A:
 341                 case SSL3_ST_SW_CERT_B:
 342                         /* Check if it is anon DH or normal PSK */
 343                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 344                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 345                                 {
 346                                 dtls1_start_timer(s);
 347                                 ret=dtls1_send_server_certificate(s);
 348                                 if (ret <= 0) goto end;
 349 #ifndef OPENSSL_NO_TLSEXT
 350                                 if (s->tlsext_status_expected)
 351                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 352                                 else
 353                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 354                                 }
 355                         else
 356                                 {
 357                                 skip = 1;
 358                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 359                                 }
 360 #else
 361                                 }
 362                         else
 363                                 skip=1;
 364
 365                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 366 #endif
 367                         s->init_num=0;
 368                         break;
 369
 370                 case SSL3_ST_SW_KEY_EXCH_A:
 371                 case SSL3_ST_SW_KEY_EXCH_B:
 372                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 373
 374                         /* clear this, it may get reset by
 375                          * send_server_key_exchange */
 376                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 377 #ifndef OPENSSL_NO_KRB5
 378                                 && !(alg_k & SSL_kKRB5)
 379 #endif /* OPENSSL_NO_KRB5 */
 380                                 )
 381                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 382                                  * even when forbidden by protocol specs
 383                                  * (handshake may fail as clients are not required to
 384                                  * be able to handle this) */
 385                                 s->s3->tmp.use_rsa_tmp=1;
 386                         else
 387                                 s->s3->tmp.use_rsa_tmp=0;
 388
 389                         /* only send if a DH key exchange or
 390                          * RSA but we have a sign only certificate */
 391                         if (s->s3->tmp.use_rsa_tmp
 392                         /* PSK: send ServerKeyExchange if PSK identity
 393                          * hint if provided */
 394 #ifndef OPENSSL_NO_PSK
 395                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 396 #endif
 397                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 398                             || (alg_k & SSL_kEECDH)
 399                             || ((alg_k & SSL_kRSA)
 400                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 401                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 402                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 403                                         )
 404                                     )
 405                                 )
 406                             )
 407                                 {
 408                                 dtls1_start_timer(s);
 409                                 ret=dtls1_send_server_key_exchange(s);
 410                                 if (ret <= 0) goto end;
 411                                 }
 412                         else
 413                                 skip=1;
 414
 415                         s->state=SSL3_ST_SW_CERT_REQ_A;
 416                         s->init_num=0;
 417                         break;
 418
 419                 case SSL3_ST_SW_CERT_REQ_A:
 420                 case SSL3_ST_SW_CERT_REQ_B:
 421                         if (/* don't request cert unless asked for it: */
 422                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 423                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 424                                  * don't request cert during re-negotiation: */
 425                                 ((s->session->peer != NULL) &&
 426                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 427                                 /* never request cert in anonymous ciphersuites
 428                                  * (see section "Certificate request" in SSL 3 drafts
 429                                  * and in RFC 2246): */
 430                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 431                                  /* ... except when the application insists on verification
 432                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 433                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 434                                  /* never request cert in Kerberos ciphersuites */
 435                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 436                                 /* With normal PSK Certificates and
 437                                  * Certificate Requests are omitted */
 438                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 439                                 {
 440                                 /* no cert request */
 441                                 skip=1;
 442                                 s->s3->tmp.cert_request=0;
 443                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 444                                 }
 445                         else
 446                                 {
 447                                 s->s3->tmp.cert_request=1;
 448                                 dtls1_start_timer(s);
 449                                 ret=dtls1_send_certificate_request(s);
 450                                 if (ret <= 0) goto end;
 451 #ifndef NETSCAPE_HANG_BUG
 452                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 453 #else
 454                                 s->state=SSL3_ST_SW_FLUSH;
 455                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 456 #endif
 457                                 s->init_num=0;
 458                                 }
 459                         break;
 460
 461                 case SSL3_ST_SW_SRVR_DONE_A:
 462                 case SSL3_ST_SW_SRVR_DONE_B:
 463                         dtls1_start_timer(s);
 464                         ret=dtls1_send_server_done(s);
 465                         if (ret <= 0) goto end;
 466                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 467                         s->state=SSL3_ST_SW_FLUSH;
 468                         s->init_num=0;
 469                         break;
 470
 471                 case SSL3_ST_SW_FLUSH:
 472                         s->rwstate=SSL_WRITING;
 473                         if (BIO_flush(s->wbio) <= 0)
 474                                 {
 475                                 ret= -1;
 476                                 goto end;
 477                                 }
 478                         s->rwstate=SSL_NOTHING;
 479                         s->state=s->s3->tmp.next_state;
 480                         break;
 481
 482                 case SSL3_ST_SR_CERT_A:
 483                 case SSL3_ST_SR_CERT_B:
 484                         /* Check for second client hello (MS SGC) */
 485                         ret = ssl3_check_client_hello(s);
 486                         if (ret <= 0)
 487                                 goto end;
 488                         dtls1_stop_timer(s);
 489                         if (ret == 2)
 490                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 491                         else {
 492                                 /* could be sent for a DH cert, even if we
 493                                  * have not asked for it :-) */
 494                                 ret=ssl3_get_client_certificate(s);
 495                                 if (ret <= 0) goto end;
 496                                 dtls1_stop_timer(s);
 497                                 s->init_num=0;
 498                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 499                         }
 500                         break;
 501
 502                 case SSL3_ST_SR_KEY_EXCH_A:
 503                 case SSL3_ST_SR_KEY_EXCH_B:
 504                         ret=ssl3_get_client_key_exchange(s);
 505                         if (ret <= 0) goto end;
 506                         dtls1_stop_timer(s);
 507                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 508                         s->init_num=0;
 509
 510                         if (ret == 2)
 511                                 {
 512                                 /* For the ECDH ciphersuites when
 513                                  * the client sends its ECDH pub key in
 514                                  * a certificate, the CertificateVerify
 515                                  * message is not sent.
 516                                  */
 517                                 s->state=SSL3_ST_SR_FINISHED_A;
 518                                 s->init_num = 0;
 519                                 }
 520                         else
 521                                 {
 522                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 523                                 s->init_num=0;
 524
 525                                 /* We need to get hashes here so if there is
 526                                  * a client cert, it can be verified */
 527                                 s->method->ssl3_enc->cert_verify_mac(s,
 528                                         NID_md5,
 529                                         &(s->s3->tmp.cert_verify_md[0]));
 530                                 s->method->ssl3_enc->cert_verify_mac(s,
 531                                         NID_sha1,
 532                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 533                                 }
 534                         break;
 535
 536                 case SSL3_ST_SR_CERT_VRFY_A:
 537                 case SSL3_ST_SR_CERT_VRFY_B:
 538
 539                         s->d1->change_cipher_spec_ok = 1;
 540                         /* we should decide if we expected this one */
 541                         ret=ssl3_get_cert_verify(s);
 542                         if (ret <= 0) goto end;
 543                         dtls1_stop_timer(s);
 544
 545                         s->state=SSL3_ST_SR_FINISHED_A;
 546                         s->init_num=0;
 547                         break;
 548
 549                 case SSL3_ST_SR_FINISHED_A:
 550                 case SSL3_ST_SR_FINISHED_B:
 551                         s->d1->change_cipher_spec_ok = 1;
 552                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 553                                 SSL3_ST_SR_FINISHED_B);
 554                         if (ret <= 0) goto end;
 555                         dtls1_stop_timer(s);
 556                         if (s->hit)
 557                                 s->state=SSL_ST_OK;
 558 #ifndef OPENSSL_NO_TLSEXT
 559                         else if (s->tlsext_ticket_expected)
 560                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 561 #endif
 562                         else
 563                                 s->state=SSL3_ST_SW_CHANGE_A;
 564                         s->init_num=0;
 565                         break;
 566
 567 #ifndef OPENSSL_NO_TLSEXT
 568                 case SSL3_ST_SW_SESSION_TICKET_A:
 569                 case SSL3_ST_SW_SESSION_TICKET_B:
 570                         ret=dtls1_send_newsession_ticket(s);
 571                         if (ret <= 0) goto end;
 572                         s->state=SSL3_ST_SW_CHANGE_A;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_SW_CERT_STATUS_A:
 577                 case SSL3_ST_SW_CERT_STATUS_B:
 578                         ret=ssl3_send_cert_status(s);
 579                         if (ret <= 0) goto end;
 580                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 581                         s->init_num=0;
 582                         break;
 583
 584 #endif
 585
 586                 case SSL3_ST_SW_CHANGE_A:
 587                 case SSL3_ST_SW_CHANGE_B:
 588
 589                         s->session->cipher=s->s3->tmp.new_cipher;
 590                         if (!s->method->ssl3_enc->setup_key_block(s))
 591                                 { ret= -1; goto end; }
 592
 593                         ret=dtls1_send_change_cipher_spec(s,
 594                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 595
 596                         if (ret <= 0) goto end;
 597                         s->state=SSL3_ST_SW_FINISHED_A;
 598                         s->init_num=0;
 599
 600                         if (!s->method->ssl3_enc->change_cipher_state(s,
 601                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 602                                 {
 603                                 ret= -1;
 604                                 goto end;
 605                                 }
 606
 607                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 608                         break;
 609
 610                 case SSL3_ST_SW_FINISHED_A:
 611                 case SSL3_ST_SW_FINISHED_B:
 612                         ret=dtls1_send_finished(s,
 613                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 614                                 s->method->ssl3_enc->server_finished_label,
 615                                 s->method->ssl3_enc->server_finished_label_len);
 616                         if (ret <= 0) goto end;
 617                         s->state=SSL3_ST_SW_FLUSH;
 618                         if (s->hit)
 619                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 620                         else
 621                                 s->s3->tmp.next_state=SSL_ST_OK;
 622                         s->init_num=0;
 623                         break;
 624
 625                 case SSL_ST_OK:
 626                         /* clean a few things up */
 627                         ssl3_cleanup_key_block(s);
 628
 629 #if 0
 630                         BUF_MEM_free(s->init_buf);
 631                         s->init_buf=NULL;
 632 #endif
 633
 634                         /* remove buffering on output */
 635                         ssl_free_wbio_buffer(s);
 636
 637                         s->init_num=0;
 638
 639                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 640                                 {
 641                                 /* actually not necessarily a 'new' session unless
 642                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 643
 644                                 s->renegotiate=0;
 645                                 s->new_session=0;
 646
 647                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 648
 649                                 s->ctx->stats.sess_accept_good++;
 650                                 /* s->server=1; */
 651                                 s->handshake_func=dtls1_accept;
 652
 653                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 654                                 }
 655
 656                         ret = 1;
 657
 658                         /* done handshaking, next message is client hello */
 659                         s->d1->handshake_read_seq = 0;
 660                         /* next message is server hello */
 661                         s->d1->handshake_write_seq = 0;
 662                         s->d1->next_handshake_write_seq = 0;
 663                         goto end;
 664                         /* break; */
 665
 666                 default:
 667                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 668                         ret= -1;
 669                         goto end;
 670                         /* break; */
 671                         }
 672
 673                 if (!s->s3->tmp.reuse_message && !skip)
 674                         {
 675                         if (s->debug)
 676                                 {
 677                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 678                                         goto end;
 679                                 }
 680
 681
 682                         if ((cb != NULL) && (s->state != state))
 683                                 {
 684                                 new_state=s->state;
 685                                 s->state=state;
 686                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 687                                 s->state=new_state;
 688                                 }
 689                         }
 690                 skip=0;
 691                 }
 692 end:
 693         /* BIO_flush(s->wbio); */
 694
 695         s->in_handshake--;
 696         if (cb != NULL)
 697                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 698         return(ret);
 699         }
 700
 701 int dtls1_send_hello_request(SSL *s)
 702         {
 703         unsigned char *p;
 704
 705         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 706                 {
 707                 p=(unsigned char *)s->init_buf->data;
 708                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 709
 710                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 711                 /* number of bytes to write */
 712                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 713                 s->init_off=0;
 714
 715                 /* no need to buffer this message, since there are no retransmit
 716                  * requests for it */
 717                 }
 718
 719         /* SSL3_ST_SW_HELLO_REQ_B */
 720         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 721         }
 722
 723 int dtls1_send_hello_verify_request(SSL *s)
 724         {
 725         unsigned int msg_len;
 726         unsigned char *msg, *buf, *p;
 727
 728         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 729                 {
 730                 buf = (unsigned char *)s->init_buf->data;
 731
 732                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 733                 *(p++) = s->version >> 8;
 734                 *(p++) = s->version & 0xFF;
 735
 736                 if (s->ctx->app_gen_cookie_cb == NULL ||
 737                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 738                          &(s->d1->cookie_len)) == 0)
 739                         {
 740                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 741                         return 0;
 742                         }
 743
 744                 *(p++) = (unsigned char) s->d1->cookie_len;
 745                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 746                 p += s->d1->cookie_len;
 747                 msg_len = p - msg;
 748
 749                 dtls1_set_message_header(s, buf,
 750                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 751
 752                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 753                 /* number of bytes to write */
 754                 s->init_num=p-buf;
 755                 s->init_off=0;
 756                 }
 757
 758         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 759         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 760         }
 761
 762 int dtls1_send_server_hello(SSL *s)
 763         {
 764         unsigned char *buf;
 765         unsigned char *p,*d;
 766         int i;
 767         unsigned int sl;
 768         unsigned long l,Time;
 769
 770         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 771                 {
 772                 buf=(unsigned char *)s->init_buf->data;
 773                 p=s->s3->server_random;
 774                 Time=(unsigned long)time(NULL);                 /* Time */
 775                 l2n(Time,p);
 776                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 777                 /* Do the message type and length last */
 778                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 779
 780                 *(p++)=s->version>>8;
 781                 *(p++)=s->version&0xff;
 782
 783                 /* Random stuff */
 784                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 785                 p+=SSL3_RANDOM_SIZE;
 786
 787                 /* now in theory we have 3 options to sending back the
 788                  * session id.  If it is a re-use, we send back the
 789                  * old session-id, if it is a new session, we send
 790                  * back the new session-id or we send back a 0 length
 791                  * session-id if we want it to be single use.
 792                  * Currently I will not implement the '0' length session-id
 793                  * 12-Jan-98 - I'll now support the '0' length stuff.
 794                  */
 795                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 796                         s->session->session_id_length=0;
 797
 798                 sl=s->session->session_id_length;
 799                 if (sl > sizeof s->session->session_id)
 800                         {
 801                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 802                         return -1;
 803                         }
 804                 *(p++)=sl;
 805                 memcpy(p,s->session->session_id,sl);
 806                 p+=sl;
 807
 808                 /* put the cipher */
 809                 if (s->s3->tmp.new_cipher == NULL)
 810                         return -1;
 811                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 812                 p+=i;
 813
 814                 /* put the compression method */
 815 #ifdef OPENSSL_NO_COMP
 816                 *(p++)=0;
 817 #else
 818                 if (s->s3->tmp.new_compression == NULL)
 819                         *(p++)=0;
 820                 else
 821                         *(p++)=s->s3->tmp.new_compression->id;
 822 #endif
 823
 824 #ifndef OPENSSL_NO_TLSEXT
 825                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 826                         {
 827                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
 828                         return -1;
 829                         }
 830 #endif
 831
 832                 /* do the header */
 833                 l=(p-d);
 834                 d=buf;
 835
 836                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 837
 838                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 839                 /* number of bytes to write */
 840                 s->init_num=p-buf;
 841                 s->init_off=0;
 842
 843                 /* buffer the message to handle re-xmits */
 844                 dtls1_buffer_message(s, 0);
 845                 }
 846
 847         /* SSL3_ST_SW_SRVR_HELLO_B */
 848         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 849         }
 850
 851 int dtls1_send_server_done(SSL *s)
 852         {
 853         unsigned char *p;
 854
 855         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 856                 {
 857                 p=(unsigned char *)s->init_buf->data;
 858
 859                 /* do the header */
 860                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 861
 862                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 863                 /* number of bytes to write */
 864                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 865                 s->init_off=0;
 866
 867                 /* buffer the message to handle re-xmits */
 868                 dtls1_buffer_message(s, 0);
 869                 }
 870
 871         /* SSL3_ST_SW_SRVR_DONE_B */
 872         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 873         }
 874
 875 int dtls1_send_server_key_exchange(SSL *s)
 876         {
 877 #ifndef OPENSSL_NO_RSA
 878         unsigned char *q;
 879         int j,num;
 880         RSA *rsa;
 881         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 882         unsigned int u;
 883 #endif
 884 #ifndef OPENSSL_NO_DH
 885         DH *dh=NULL,*dhp;
 886 #endif
 887 #ifndef OPENSSL_NO_ECDH
 888         EC_KEY *ecdh=NULL, *ecdhp;
 889         unsigned char *encodedPoint = NULL;
 890         int encodedlen = 0;
 891         int curve_id = 0;
 892         BN_CTX *bn_ctx = NULL;
 893 #endif
 894         EVP_PKEY *pkey;
 895         unsigned char *p,*d;
 896         int al,i;
 897         unsigned long type;
 898         int n;
 899         CERT *cert;
 900         BIGNUM *r[4];
 901         int nr[4],kn;
 902         BUF_MEM *buf;
 903         EVP_MD_CTX md_ctx;
 904
 905         EVP_MD_CTX_init(&md_ctx);
 906         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 907                 {
 908                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 909                 cert=s->cert;
 910
 911                 buf=s->init_buf;
 912
 913                 r[0]=r[1]=r[2]=r[3]=NULL;
 914                 n=0;
 915 #ifndef OPENSSL_NO_RSA
 916                 if (type & SSL_kRSA)
 917                         {
 918                         rsa=cert->rsa_tmp;
 919                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 920                                 {
 921                                 rsa=s->cert->rsa_tmp_cb(s,
 922                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 923                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 924                                 if(rsa == NULL)
 925                                 {
 926                                         al=SSL_AD_HANDSHAKE_FAILURE;
 927                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 928                                         goto f_err;
 929                                 }
 930                                 RSA_up_ref(rsa);
 931                                 cert->rsa_tmp=rsa;
 932                                 }
 933                         if (rsa == NULL)
 934                                 {
 935                                 al=SSL_AD_HANDSHAKE_FAILURE;
 936                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 937                                 goto f_err;
 938                                 }
 939                         r[0]=rsa->n;
 940                         r[1]=rsa->e;
 941                         s->s3->tmp.use_rsa_tmp=1;
 942                         }
 943                 else
 944 #endif
 945 #ifndef OPENSSL_NO_DH
 946                         if (type & SSL_kEDH)
 947                         {
 948                         dhp=cert->dh_tmp;
 949                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 950                                 dhp=s->cert->dh_tmp_cb(s,
 951                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 952                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 953                         if (dhp == NULL)
 954                                 {
 955                                 al=SSL_AD_HANDSHAKE_FAILURE;
 956                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 957                                 goto f_err;
 958                                 }
 959
 960                         if (s->s3->tmp.dh != NULL)
 961                                 {
 962                                 DH_free(dh);
 963                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 964                                 goto err;
 965                                 }
 966
 967                         if ((dh=DHparams_dup(dhp)) == NULL)
 968                                 {
 969                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 970                                 goto err;
 971                                 }
 972
 973                         s->s3->tmp.dh=dh;
 974                         if ((dhp->pub_key == NULL ||
 975                              dhp->priv_key == NULL ||
 976                              (s->options & SSL_OP_SINGLE_DH_USE)))
 977                                 {
 978                                 if(!DH_generate_key(dh))
 979                                     {
 980                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 981                                            ERR_R_DH_LIB);
 982                                     goto err;
 983                                     }
 984                                 }
 985                         else
 986                                 {
 987                                 dh->pub_key=BN_dup(dhp->pub_key);
 988                                 dh->priv_key=BN_dup(dhp->priv_key);
 989                                 if ((dh->pub_key == NULL) ||
 990                                         (dh->priv_key == NULL))
 991                                         {
 992                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 993                                         goto err;
 994                                         }
 995                                 }
 996                         r[0]=dh->p;
 997                         r[1]=dh->g;
 998                         r[2]=dh->pub_key;
 999                         }
1000                 else
1001 #endif
1002 #ifndef OPENSSL_NO_ECDH
1003                         if (type & SSL_kEECDH)
1004                         {
1005                         const EC_GROUP *group;
1006
1007                         ecdhp=cert->ecdh_tmp;
1008                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1009                                 {
1010                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1011                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1012                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1013                                 }
1014                         if (ecdhp == NULL)
1015                                 {
1016                                 al=SSL_AD_HANDSHAKE_FAILURE;
1017                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1018                                 goto f_err;
1019                                 }
1020
1021                         if (s->s3->tmp.ecdh != NULL)
1022                                 {
1023                                 EC_KEY_free(s->s3->tmp.ecdh);
1024                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1025                                 goto err;
1026                                 }
1027
1028                         /* Duplicate the ECDH structure. */
1029                         if (ecdhp == NULL)
1030                                 {
1031                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1032                                 goto err;
1033                                 }
1034                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1035                                 {
1036                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1037                                 goto err;
1038                                 }
1039
1040                         s->s3->tmp.ecdh=ecdh;
1041                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1042                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1043                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1044                                 {
1045                                 if(!EC_KEY_generate_key(ecdh))
1046                                     {
1047                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1048                                     goto err;
1049                                     }
1050                                 }
1051
1052                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1053                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1054                             (EC_KEY_get0_private_key(ecdh) == NULL))
1055                                 {
1056                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1057                                 goto err;
1058                                 }
1059
1060                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1061                             (EC_GROUP_get_degree(group) > 163))
1062                                 {
1063                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1064                                 goto err;
1065                                 }
1066
1067                         /* XXX: For now, we only support ephemeral ECDH
1068                          * keys over named (not generic) curves. For
1069                          * supported named curves, curve_id is non-zero.
1070                          */
1071                         if ((curve_id =
1072                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1073                             == 0)
1074                                 {
1075                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1076                                 goto err;
1077                                 }
1078
1079                         /* Encode the public key.
1080                          * First check the size of encoding and
1081                          * allocate memory accordingly.
1082                          */
1083                         encodedlen = EC_POINT_point2oct(group,
1084                             EC_KEY_get0_public_key(ecdh),
1085                             POINT_CONVERSION_UNCOMPRESSED,
1086                             NULL, 0, NULL);
1087
1088                         encodedPoint = (unsigned char *)
1089                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1090                         bn_ctx = BN_CTX_new();
1091                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1092                                 {
1093                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1094                                 goto err;
1095                                 }
1096
1097
1098                         encodedlen = EC_POINT_point2oct(group,
1099                             EC_KEY_get0_public_key(ecdh),
1100                             POINT_CONVERSION_UNCOMPRESSED,
1101                             encodedPoint, encodedlen, bn_ctx);
1102
1103                         if (encodedlen == 0)
1104                                 {
1105                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1106                                 goto err;
1107                                 }
1108
1109                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1110
1111                         /* XXX: For now, we only support named (not
1112                          * generic) curves in ECDH ephemeral key exchanges.
1113                          * In this situation, we need four additional bytes
1114                          * to encode the entire ServerECDHParams
1115                          * structure.
1116                          */
1117                         n = 4 + encodedlen;
1118
1119                         /* We'll generate the serverKeyExchange message
1120                          * explicitly so we can set these to NULLs
1121                          */
1122                         r[0]=NULL;
1123                         r[1]=NULL;
1124                         r[2]=NULL;
1125                         r[3]=NULL;
1126                         }
1127                 else
1128 #endif /* !OPENSSL_NO_ECDH */
1129 #ifndef OPENSSL_NO_PSK
1130                         if (type & SSL_kPSK)
1131                                 {
1132                                 /* reserve size for record length and PSK identity hint*/
1133                                 n+=2+strlen(s->ctx->psk_identity_hint);
1134                                 }
1135                         else
1136 #endif /* !OPENSSL_NO_PSK */
1137                         {
1138                         al=SSL_AD_HANDSHAKE_FAILURE;
1139                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1140                         goto f_err;
1141                         }
1142                 for (i=0; r[i] != NULL; i++)
1143                         {
1144                         nr[i]=BN_num_bytes(r[i]);
1145                         n+=2+nr[i];
1146                         }
1147
1148                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1149                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1150                         {
1151                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1152                                 == NULL)
1153                                 {
1154                                 al=SSL_AD_DECODE_ERROR;
1155                                 goto f_err;
1156                                 }
1157                         kn=EVP_PKEY_size(pkey);
1158                         }
1159                 else
1160                         {
1161                         pkey=NULL;
1162                         kn=0;
1163                         }
1164
1165                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1166                         {
1167                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1168                         goto err;
1169                         }
1170                 d=(unsigned char *)s->init_buf->data;
1171                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1172
1173                 for (i=0; r[i] != NULL; i++)
1174                         {
1175                         s2n(nr[i],p);
1176                         BN_bn2bin(r[i],p);
1177                         p+=nr[i];
1178                         }
1179
1180 #ifndef OPENSSL_NO_ECDH
1181                 if (type & SSL_kEECDH)
1182                         {
1183                         /* XXX: For now, we only support named (not generic) curves.
1184                          * In this situation, the serverKeyExchange message has:
1185                          * [1 byte CurveType], [2 byte CurveName]
1186                          * [1 byte length of encoded point], followed by
1187                          * the actual encoded point itself
1188                          */
1189                         *p = NAMED_CURVE_TYPE;
1190                         p += 1;
1191                         *p = 0;
1192                         p += 1;
1193                         *p = curve_id;
1194                         p += 1;
1195                         *p = encodedlen;
1196                         p += 1;
1197                         memcpy((unsigned char*)p,
1198                             (unsigned char *)encodedPoint,
1199                             encodedlen);
1200                         OPENSSL_free(encodedPoint);
1201                         p += encodedlen;
1202                         }
1203 #endif
1204
1205 #ifndef OPENSSL_NO_PSK
1206                 if (type & SSL_kPSK)
1207                         {
1208                         /* copy PSK identity hint */
1209                         s2n(strlen(s->ctx->psk_identity_hint), p);
1210                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1211                         p+=strlen(s->ctx->psk_identity_hint);
1212                         }
1213 #endif
1214
1215                 /* not anonymous */
1216                 if (pkey != NULL)
1217                         {
1218                         /* n is the length of the params, they start at
1219                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1220                          * at the end. */
1221 #ifndef OPENSSL_NO_RSA
1222                         if (pkey->type == EVP_PKEY_RSA)
1223                                 {
1224                                 q=md_buf;
1225                                 j=0;
1226                                 for (num=2; num > 0; num--)
1227                                         {
1228                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1229                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1230                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1231                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1232                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1233                                         EVP_DigestFinal_ex(&md_ctx,q,
1234                                                 (unsigned int *)&i);
1235                                         q+=i;
1236                                         j+=i;
1237                                         }
1238                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1239                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1240                                         {
1241                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1242                                         goto err;
1243                                         }
1244                                 s2n(u,p);
1245                                 n+=u+2;
1246                                 }
1247                         else
1248 #endif
1249 #if !defined(OPENSSL_NO_DSA)
1250                                 if (pkey->type == EVP_PKEY_DSA)
1251                                 {
1252                                 /* lets do DSS */
1253                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1254                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1255                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1256                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1257                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1258                                         (unsigned int *)&i,pkey))
1259                                         {
1260                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1261                                         goto err;
1262                                         }
1263                                 s2n(i,p);
1264                                 n+=i+2;
1265                                 }
1266                         else
1267 #endif
1268 #if !defined(OPENSSL_NO_ECDSA)
1269                                 if (pkey->type == EVP_PKEY_EC)
1270                                 {
1271                                 /* let's do ECDSA */
1272                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1273                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1274                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1275                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1276                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1277                                         (unsigned int *)&i,pkey))
1278                                         {
1279                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1280                                         goto err;
1281                                         }
1282                                 s2n(i,p);
1283                                 n+=i+2;
1284                                 }
1285                         else
1286 #endif
1287                                 {
1288                                 /* Is this error check actually needed? */
1289                                 al=SSL_AD_HANDSHAKE_FAILURE;
1290                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1291                                 goto f_err;
1292                                 }
1293                         }
1294
1295                 d = dtls1_set_message_header(s, d,
1296                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1297
1298                 /* we should now have things packed up, so lets send
1299                  * it off */
1300                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1301                 s->init_off=0;
1302
1303                 /* buffer the message to handle re-xmits */
1304                 dtls1_buffer_message(s, 0);
1305                 }
1306
1307         s->state = SSL3_ST_SW_KEY_EXCH_B;
1308         EVP_MD_CTX_cleanup(&md_ctx);
1309         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1310 f_err:
1311         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1312 err:
1313 #ifndef OPENSSL_NO_ECDH
1314         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1315         BN_CTX_free(bn_ctx);
1316 #endif
1317         EVP_MD_CTX_cleanup(&md_ctx);
1318         return(-1);
1319         }
1320
1321 int dtls1_send_certificate_request(SSL *s)
1322         {
1323         unsigned char *p,*d;
1324         int i,j,nl,off,n;
1325         STACK_OF(X509_NAME) *sk=NULL;
1326         X509_NAME *name;
1327         BUF_MEM *buf;
1328         unsigned int msg_len;
1329
1330         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1331                 {
1332                 buf=s->init_buf;
1333
1334                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1335
1336                 /* get the list of acceptable cert types */
1337                 p++;
1338                 n=ssl3_get_req_cert_type(s,p);
1339                 d[0]=n;
1340                 p+=n;
1341                 n++;
1342
1343                 off=n;
1344                 p+=2;
1345                 n+=2;
1346
1347                 sk=SSL_get_client_CA_list(s);
1348                 nl=0;
1349                 if (sk != NULL)
1350                         {
1351                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1352                                 {
1353                                 name=sk_X509_NAME_value(sk,i);
1354                                 j=i2d_X509_NAME(name,NULL);
1355                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1356                                         {
1357                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1358                                         goto err;
1359                                         }
1360                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1361                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1362                                         {
1363                                         s2n(j,p);
1364                                         i2d_X509_NAME(name,&p);
1365                                         n+=2+j;
1366                                         nl+=2+j;
1367                                         }
1368                                 else
1369                                         {
1370                                         d=p;
1371                                         i2d_X509_NAME(name,&p);
1372                                         j-=2; s2n(j,d); j+=2;
1373                                         n+=j;
1374                                         nl+=j;
1375                                         }
1376                                 }
1377                         }
1378                 /* else no CA names */
1379                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1380                 s2n(nl,p);
1381
1382                 d=(unsigned char *)buf->data;
1383                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1384                 l2n3(n,d);
1385                 s2n(s->d1->handshake_write_seq,d);
1386                 s->d1->handshake_write_seq++;
1387
1388                 /* we should now have things packed up, so lets send
1389                  * it off */
1390
1391                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1392                 s->init_off=0;
1393 #ifdef NETSCAPE_HANG_BUG
1394 /* XXX: what to do about this? */
1395                 p=(unsigned char *)s->init_buf->data + s->init_num;
1396
1397                 /* do the header */
1398                 *(p++)=SSL3_MT_SERVER_DONE;
1399                 *(p++)=0;
1400                 *(p++)=0;
1401                 *(p++)=0;
1402                 s->init_num += 4;
1403 #endif
1404
1405                 /* XDTLS:  set message header ? */
1406                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1407                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1408                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1409
1410                 /* buffer the message to handle re-xmits */
1411                 dtls1_buffer_message(s, 0);
1412
1413                 s->state = SSL3_ST_SW_CERT_REQ_B;
1414                 }
1415
1416         /* SSL3_ST_SW_CERT_REQ_B */
1417         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1418 err:
1419         return(-1);
1420         }
1421
1422 int dtls1_send_server_certificate(SSL *s)
1423         {
1424         unsigned long l;
1425         X509 *x;
1426
1427         if (s->state == SSL3_ST_SW_CERT_A)
1428                 {
1429                 x=ssl_get_server_send_cert(s);
1430                 if (x == NULL)
1431                         {
1432                         /* VRS: allow null cert if auth == KRB5 */
1433                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1434                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1435                                 {
1436                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1437                                 return(0);
1438                                 }
1439                         }
1440
1441                 l=dtls1_output_cert_chain(s,x);
1442                 s->state=SSL3_ST_SW_CERT_B;
1443                 s->init_num=(int)l;
1444                 s->init_off=0;
1445
1446                 /* buffer the message to handle re-xmits */
1447                 dtls1_buffer_message(s, 0);
1448                 }
1449
1450         /* SSL3_ST_SW_CERT_B */
1451         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1452         }
1453
1454 #ifndef OPENSSL_NO_TLSEXT
1455 int dtls1_send_newsession_ticket(SSL *s)
1456         {
1457         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1458                 {
1459                 unsigned char *p, *senc, *macstart;
1460                 int len, slen;
1461                 unsigned int hlen, msg_len;
1462                 EVP_CIPHER_CTX ctx;
1463                 HMAC_CTX hctx;
1464                 SSL_CTX *tctx = s->initial_ctx;
1465                 unsigned char iv[EVP_MAX_IV_LENGTH];
1466                 unsigned char key_name[16];
1467
1468                 /* get session encoding length */
1469                 slen = i2d_SSL_SESSION(s->session, NULL);
1470                 /* Some length values are 16 bits, so forget it if session is
1471                  * too long
1472                  */
1473                 if (slen > 0xFF00)
1474                         return -1;
1475                 /* Grow buffer if need be: the length calculation is as
1476                  * follows 12 (DTLS handshake message header) +
1477                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1478                  * 16 (key name) + max_iv_len (iv length) +
1479                  * session_length + max_enc_block_size (max encrypted session
1480                  * length) + max_md_size (HMAC).
1481                  */
1482                 if (!BUF_MEM_grow(s->init_buf,
1483                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1484                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1485                         return -1;
1486                 senc = OPENSSL_malloc(slen);
1487                 if (!senc)
1488                         return -1;
1489                 p = senc;
1490                 i2d_SSL_SESSION(s->session, &p);
1491
1492                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1493                 EVP_CIPHER_CTX_init(&ctx);
1494                 HMAC_CTX_init(&hctx);
1495                 /* Initialize HMAC and cipher contexts. If callback present
1496                  * it does all the work otherwise use generated values
1497                  * from parent ctx.
1498                  */
1499                 if (tctx->tlsext_ticket_key_cb)
1500                         {
1501                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1502                                                          &hctx, 1) < 0)
1503                                 {
1504                                 OPENSSL_free(senc);
1505                                 return -1;
1506                                 }
1507                         }
1508                 else
1509                         {
1510                         RAND_pseudo_bytes(iv, 16);
1511                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1512                                         tctx->tlsext_tick_aes_key, iv);
1513                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1514                                         tlsext_tick_md(), NULL);
1515                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1516                         }
1517                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1518                 /* Skip ticket length for now */
1519                 p += 2;
1520                 /* Output key name */
1521                 macstart = p;
1522                 memcpy(p, key_name, 16);
1523                 p += 16;
1524                 /* output IV */
1525                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1526                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1527                 /* Encrypt session data */
1528                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1529                 p += len;
1530                 EVP_EncryptFinal(&ctx, p, &len);
1531                 p += len;
1532                 EVP_CIPHER_CTX_cleanup(&ctx);
1533
1534                 HMAC_Update(&hctx, macstart, p - macstart);
1535                 HMAC_Final(&hctx, p, &hlen);
1536                 HMAC_CTX_cleanup(&hctx);
1537
1538                 p += hlen;
1539                 /* Now write out lengths: p points to end of data written */
1540                 /* Total length */
1541                 len = p - (unsigned char *)(s->init_buf->data);
1542                 /* Ticket length */
1543                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1544                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1545
1546                 /* number of bytes to write */
1547                 s->init_num= len;
1548                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1549                 s->init_off=0;
1550                 OPENSSL_free(senc);
1551
1552                 /* XDTLS:  set message header ? */
1553                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1554                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1555                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1556
1557                 /* buffer the message to handle re-xmits */
1558                 dtls1_buffer_message(s, 0);
1559                 }
1560
1561         /* SSL3_ST_SW_SESSION_TICKET_B */
1562         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1563         }
1564 #endif