ssl/d1_srvr.c

   1 /* ssl/d1_srvr.c */
   2 /*
   3  * DTLS implementation written by Nagendra Modadugu
   4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  60  * All rights reserved.
  61  *
  62  * This package is an SSL implementation written
  63  * by Eric Young (eay@cryptsoft.com).
  64  * The implementation was written so as to conform with Netscapes SSL.
  65  *
  66  * This library is free for commercial and non-commercial use as long as
  67  * the following conditions are aheared to.  The following conditions
  68  * apply to all code found in this distribution, be it the RC4, RSA,
  69  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  70  * included with this distribution is covered by the same copyright terms
  71  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  72  *
  73  * Copyright remains Eric Young's, and as such any Copyright notices in
  74  * the code are not to be removed.
  75  * If this package is used in a product, Eric Young should be given attribution
  76  * as the author of the parts of the library used.
  77  * This can be in the form of a textual message at program startup or
  78  * in documentation (online or textual) provided with the package.
  79  *
  80  * Redistribution and use in source and binary forms, with or without
  81  * modification, are permitted provided that the following conditions
  82  * are met:
  83  * 1. Redistributions of source code must retain the copyright
  84  *    notice, this list of conditions and the following disclaimer.
  85  * 2. Redistributions in binary form must reproduce the above copyright
  86  *    notice, this list of conditions and the following disclaimer in the
  87  *    documentation and/or other materials provided with the distribution.
  88  * 3. All advertising materials mentioning features or use of this software
  89  *    must display the following acknowledgement:
  90  *    "This product includes cryptographic software written by
  91  *     Eric Young (eay@cryptsoft.com)"
  92  *    The word 'cryptographic' can be left out if the rouines from the library
  93  *    being used are not cryptographic related :-).
  94  * 4. If you include any Windows specific code (or a derivative thereof) from
  95  *    the apps directory (application code) you must include an acknowledgement:
  96  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  97  *
  98  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  99  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 100  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 101  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 102  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 103  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 104  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 105  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 106  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 107  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 108  * SUCH DAMAGE.
 109  *
 110  * The licence and distribution terms for any publically available version or
 111  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 112  * copied and put under another distribution licence
 113  * [including the GNU Public Licence.]
 114  */
 115
 116 #include <stdio.h>
 117 #include "ssl_locl.h"
 118 #include <openssl/buffer.h>
 119 #include <openssl/rand.h>
 120 #include <openssl/objects.h>
 121 #include <openssl/evp.h>
 122 #include <openssl/x509.h>
 123 #include <openssl/md5.h>
 124 #include <openssl/bn.h>
 125 #ifndef OPENSSL_NO_DH
 126 #include <openssl/dh.h>
 127 #endif
 128
 129 static const SSL_METHOD *dtls1_get_server_method(int ver);
 130 static int dtls1_send_hello_verify_request(SSL *s);
 131
 132 static const SSL_METHOD *dtls1_get_server_method(int ver)
 133         {
 134         if (ver == DTLS1_VERSION)
 135                 return(DTLSv1_server_method());
 136         else
 137                 return(NULL);
 138         }
 139
 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
 141                         dtls1_accept,
 142                         ssl_undefined_function,
 143                         dtls1_get_server_method)
 144
 145 int dtls1_accept(SSL *s)
 146         {
 147         BUF_MEM *buf;
 148         unsigned long Time=(unsigned long)time(NULL);
 149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 150         long num1;
 151         unsigned long alg_k;
 152         int ret= -1;
 153         int new_state,state,skip=0;
 154
 155         RAND_add(&Time,sizeof(Time),0);
 156         ERR_clear_error();
 157         clear_sys_error();
 158
 159         if (s->info_callback != NULL)
 160                 cb=s->info_callback;
 161         else if (s->ctx->info_callback != NULL)
 162                 cb=s->ctx->info_callback;
 163
 164         /* init things to blank */
 165         s->in_handshake++;
 166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 167
 168         if (s->cert == NULL)
 169                 {
 170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 171                 return(-1);
 172                 }
 173
 174         for (;;)
 175                 {
 176                 state=s->state;
 177
 178                 switch (s->state)
 179                         {
 180                 case SSL_ST_RENEGOTIATE:
 181                         s->new_session=1;
 182                         /* s->state=SSL_ST_ACCEPT; */
 183
 184                 case SSL_ST_BEFORE:
 185                 case SSL_ST_ACCEPT:
 186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 187                 case SSL_ST_OK|SSL_ST_ACCEPT:
 188
 189                         s->server=1;
 190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 191
 192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
 193                                 {
 194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
 195                                 return -1;
 196                                 }
 197                         s->type=SSL_ST_ACCEPT;
 198
 199                         if (s->init_buf == NULL)
 200                                 {
 201                                 if ((buf=BUF_MEM_new()) == NULL)
 202                                         {
 203                                         ret= -1;
 204                                         goto end;
 205                                         }
 206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 207                                         {
 208                                         ret= -1;
 209                                         goto end;
 210                                         }
 211                                 s->init_buf=buf;
 212                                 }
 213
 214                         if (!ssl3_setup_buffers(s))
 215                                 {
 216                                 ret= -1;
 217                                 goto end;
 218                                 }
 219
 220                         s->init_num=0;
 221
 222                         if (s->state != SSL_ST_RENEGOTIATE)
 223                                 {
 224                                 /* Ok, we now need to push on a buffering BIO so that
 225                                  * the output is sent in a way that TCP likes :-)
 226                                  */
 227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 228
 229                                 ssl3_init_finished_mac(s);
 230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 231                                 s->ctx->stats.sess_accept++;
 232                                 }
 233                         else
 234                                 {
 235                                 /* s->state == SSL_ST_RENEGOTIATE,
 236                                  * we will just send a HelloRequest */
 237                                 s->ctx->stats.sess_accept_renegotiate++;
 238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 239                                 }
 240
 241                         break;
 242
 243                 case SSL3_ST_SW_HELLO_REQ_A:
 244                 case SSL3_ST_SW_HELLO_REQ_B:
 245
 246                         s->shutdown=0;
 247                         dtls1_start_timer(s);
 248                         ret=dtls1_send_hello_request(s);
 249                         if (ret <= 0) goto end;
 250                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 251                         s->state=SSL3_ST_SW_FLUSH;
 252                         s->init_num=0;
 253
 254                         ssl3_init_finished_mac(s);
 255                         break;
 256
 257                 case SSL3_ST_SW_HELLO_REQ_C:
 258                         s->state=SSL_ST_OK;
 259                         break;
 260
 261                 case SSL3_ST_SR_CLNT_HELLO_A:
 262                 case SSL3_ST_SR_CLNT_HELLO_B:
 263                 case SSL3_ST_SR_CLNT_HELLO_C:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_get_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         dtls1_stop_timer(s);
 269                         s->new_session = 2;
 270
 271                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
 272                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
 273                         else
 274                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
 275
 276                         s->init_num=0;
 277
 278                         /* If we're just listening, stop here */
 279                         if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
 280                                 {
 281                                 ret = 2;
 282                                 s->d1->listen = 0;
 283                                 goto end;
 284                                 }
 285
 286                         break;
 287
 288                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
 289                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
 290
 291                         dtls1_start_timer(s);
 292                         ret = dtls1_send_hello_verify_request(s);
 293                         if ( ret <= 0) goto end;
 294                         s->state=SSL3_ST_SW_FLUSH;
 295                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
 296
 297                         /* HelloVerifyRequest resets Finished MAC */
 298                         if (s->version != DTLS1_BAD_VER)
 299                                 ssl3_init_finished_mac(s);
 300                         break;
 301
 302                 case SSL3_ST_SW_SRVR_HELLO_A:
 303                 case SSL3_ST_SW_SRVR_HELLO_B:
 304                         dtls1_start_timer(s);
 305                         ret=dtls1_send_server_hello(s);
 306                         if (ret <= 0) goto end;
 307
 308                         if (s->hit)
 309                                 s->state=SSL3_ST_SW_CHANGE_A;
 310                         else
 311                                 s->state=SSL3_ST_SW_CERT_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_SW_CERT_A:
 316                 case SSL3_ST_SW_CERT_B:
 317                         /* Check if it is anon DH or normal PSK */
 318                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 319                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 320                                 {
 321                                 dtls1_start_timer(s);
 322                                 ret=dtls1_send_server_certificate(s);
 323                                 if (ret <= 0) goto end;
 324                                 }
 325                         else
 326                                 skip=1;
 327                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 328                         s->init_num=0;
 329                         break;
 330
 331                 case SSL3_ST_SW_KEY_EXCH_A:
 332                 case SSL3_ST_SW_KEY_EXCH_B:
 333                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 334
 335                         /* clear this, it may get reset by
 336                          * send_server_key_exchange */
 337                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 338 #ifndef OPENSSL_NO_KRB5
 339                                 && !(alg_k & SSL_kKRB5)
 340 #endif /* OPENSSL_NO_KRB5 */
 341                                 )
 342                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 343                                  * even when forbidden by protocol specs
 344                                  * (handshake may fail as clients are not required to
 345                                  * be able to handle this) */
 346                                 s->s3->tmp.use_rsa_tmp=1;
 347                         else
 348                                 s->s3->tmp.use_rsa_tmp=0;
 349
 350                         /* only send if a DH key exchange or
 351                          * RSA but we have a sign only certificate */
 352                         if (s->s3->tmp.use_rsa_tmp
 353                         /* PSK: send ServerKeyExchange if PSK identity
 354                          * hint if provided */
 355 #ifndef OPENSSL_NO_PSK
 356                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 357 #endif
 358                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
 359                             || (alg_k & SSL_kEECDH)
 360                             || ((alg_k & SSL_kRSA)
 361                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 362                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 363                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 364                                         )
 365                                     )
 366                                 )
 367                             )
 368                                 {
 369                                 dtls1_start_timer(s);
 370                                 ret=dtls1_send_server_key_exchange(s);
 371                                 if (ret <= 0) goto end;
 372                                 }
 373                         else
 374                                 skip=1;
 375
 376                         s->state=SSL3_ST_SW_CERT_REQ_A;
 377                         s->init_num=0;
 378                         break;
 379
 380                 case SSL3_ST_SW_CERT_REQ_A:
 381                 case SSL3_ST_SW_CERT_REQ_B:
 382                         if (/* don't request cert unless asked for it: */
 383                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 384                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 385                                  * don't request cert during re-negotiation: */
 386                                 ((s->session->peer != NULL) &&
 387                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 388                                 /* never request cert in anonymous ciphersuites
 389                                  * (see section "Certificate request" in SSL 3 drafts
 390                                  * and in RFC 2246): */
 391                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 392                                  /* ... except when the application insists on verification
 393                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 394                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 395                                  /* never request cert in Kerberos ciphersuites */
 396                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 397                                 /* With normal PSK Certificates and
 398                                  * Certificate Requests are omitted */
 399                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 400                                 {
 401                                 /* no cert request */
 402                                 skip=1;
 403                                 s->s3->tmp.cert_request=0;
 404                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 405                                 }
 406                         else
 407                                 {
 408                                 s->s3->tmp.cert_request=1;
 409                                 dtls1_start_timer(s);
 410                                 ret=dtls1_send_certificate_request(s);
 411                                 if (ret <= 0) goto end;
 412 #ifndef NETSCAPE_HANG_BUG
 413                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 414 #else
 415                                 s->state=SSL3_ST_SW_FLUSH;
 416                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 417 #endif
 418                                 s->init_num=0;
 419                                 }
 420                         break;
 421
 422                 case SSL3_ST_SW_SRVR_DONE_A:
 423                 case SSL3_ST_SW_SRVR_DONE_B:
 424                         dtls1_start_timer(s);
 425                         ret=dtls1_send_server_done(s);
 426                         if (ret <= 0) goto end;
 427                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 428                         s->state=SSL3_ST_SW_FLUSH;
 429                         s->init_num=0;
 430                         break;
 431
 432                 case SSL3_ST_SW_FLUSH:
 433                         /* number of bytes to be flushed */
 434                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 435                         if (num1 > 0)
 436                                 {
 437                                 s->rwstate=SSL_WRITING;
 438                                 num1=BIO_flush(s->wbio);
 439                                 if (num1 <= 0) { ret= -1; goto end; }
 440                                 s->rwstate=SSL_NOTHING;
 441                                 }
 442
 443                         s->state=s->s3->tmp.next_state;
 444                         break;
 445
 446                 case SSL3_ST_SR_CERT_A:
 447                 case SSL3_ST_SR_CERT_B:
 448                         /* Check for second client hello (MS SGC) */
 449                         ret = ssl3_check_client_hello(s);
 450                         if (ret <= 0)
 451                                 goto end;
 452                         dtls1_stop_timer(s);
 453                         if (ret == 2)
 454                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 455                         else {
 456                                 /* could be sent for a DH cert, even if we
 457                                  * have not asked for it :-) */
 458                                 ret=ssl3_get_client_certificate(s);
 459                                 if (ret <= 0) goto end;
 460                                 dtls1_stop_timer(s);
 461                                 s->init_num=0;
 462                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 463                         }
 464                         break;
 465
 466                 case SSL3_ST_SR_KEY_EXCH_A:
 467                 case SSL3_ST_SR_KEY_EXCH_B:
 468                         ret=ssl3_get_client_key_exchange(s);
 469                         if (ret <= 0) goto end;
 470                         dtls1_stop_timer(s);
 471                         s->state=SSL3_ST_SR_CERT_VRFY_A;
 472                         s->init_num=0;
 473
 474                         if (ret == 2)
 475                                 {
 476                                 /* For the ECDH ciphersuites when
 477                                  * the client sends its ECDH pub key in
 478                                  * a certificate, the CertificateVerify
 479                                  * message is not sent.
 480                                  */
 481                                 s->state=SSL3_ST_SR_FINISHED_A;
 482                                 s->init_num = 0;
 483                                 }
 484                         else
 485                                 {
 486                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 487                                 s->init_num=0;
 488
 489                                 /* We need to get hashes here so if there is
 490                                  * a client cert, it can be verified */
 491                                 s->method->ssl3_enc->cert_verify_mac(s,
 492                                         NID_md5,
 493                                         &(s->s3->tmp.cert_verify_md[0]));
 494                                 s->method->ssl3_enc->cert_verify_mac(s,
 495                                         NID_sha1,
 496                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 497                                 }
 498                         break;
 499
 500                 case SSL3_ST_SR_CERT_VRFY_A:
 501                 case SSL3_ST_SR_CERT_VRFY_B:
 502
 503                         s->d1->change_cipher_spec_ok = 1;
 504                         /* we should decide if we expected this one */
 505                         ret=ssl3_get_cert_verify(s);
 506                         if (ret <= 0) goto end;
 507                         dtls1_stop_timer(s);
 508
 509                         s->state=SSL3_ST_SR_FINISHED_A;
 510                         s->init_num=0;
 511                         break;
 512
 513                 case SSL3_ST_SR_FINISHED_A:
 514                 case SSL3_ST_SR_FINISHED_B:
 515                         s->d1->change_cipher_spec_ok = 1;
 516                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 517                                 SSL3_ST_SR_FINISHED_B);
 518                         if (ret <= 0) goto end;
 519                         dtls1_stop_timer(s);
 520                         if (s->hit)
 521                                 s->state=SSL_ST_OK;
 522                         else
 523                                 s->state=SSL3_ST_SW_CHANGE_A;
 524                         s->init_num=0;
 525                         break;
 526
 527                 case SSL3_ST_SW_CHANGE_A:
 528                 case SSL3_ST_SW_CHANGE_B:
 529
 530                         s->session->cipher=s->s3->tmp.new_cipher;
 531                         if (!s->method->ssl3_enc->setup_key_block(s))
 532                                 { ret= -1; goto end; }
 533
 534                         ret=dtls1_send_change_cipher_spec(s,
 535                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 536
 537                         if (ret <= 0) goto end;
 538                         s->state=SSL3_ST_SW_FINISHED_A;
 539                         s->init_num=0;
 540
 541                         if (!s->method->ssl3_enc->change_cipher_state(s,
 542                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 543                                 {
 544                                 ret= -1;
 545                                 goto end;
 546                                 }
 547
 548                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 549                         break;
 550
 551                 case SSL3_ST_SW_FINISHED_A:
 552                 case SSL3_ST_SW_FINISHED_B:
 553                         ret=dtls1_send_finished(s,
 554                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 555                                 s->method->ssl3_enc->server_finished_label,
 556                                 s->method->ssl3_enc->server_finished_label_len);
 557                         if (ret <= 0) goto end;
 558                         s->state=SSL3_ST_SW_FLUSH;
 559                         if (s->hit)
 560                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 561                         else
 562                                 s->s3->tmp.next_state=SSL_ST_OK;
 563                         s->init_num=0;
 564                         break;
 565
 566                 case SSL_ST_OK:
 567                         /* clean a few things up */
 568                         ssl3_cleanup_key_block(s);
 569
 570 #if 0
 571                         BUF_MEM_free(s->init_buf);
 572                         s->init_buf=NULL;
 573 #endif
 574
 575                         /* remove buffering on output */
 576                         ssl_free_wbio_buffer(s);
 577
 578                         s->init_num=0;
 579
 580                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 581                                 {
 582                                 /* actually not necessarily a 'new' session unless
 583                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 584
 585                                 s->new_session=0;
 586
 587                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 588
 589                                 s->ctx->stats.sess_accept_good++;
 590                                 /* s->server=1; */
 591                                 s->handshake_func=dtls1_accept;
 592
 593                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 594                                 }
 595
 596                         ret = 1;
 597
 598                         /* done handshaking, next message is client hello */
 599                         s->d1->handshake_read_seq = 0;
 600                         /* next message is server hello */
 601                         s->d1->handshake_write_seq = 0;
 602                         s->d1->next_handshake_write_seq = 0;
 603                         goto end;
 604                         /* break; */
 605
 606                 default:
 607                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 608                         ret= -1;
 609                         goto end;
 610                         /* break; */
 611                         }
 612
 613                 if (!s->s3->tmp.reuse_message && !skip)
 614                         {
 615                         if (s->debug)
 616                                 {
 617                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 618                                         goto end;
 619                                 }
 620
 621
 622                         if ((cb != NULL) && (s->state != state))
 623                                 {
 624                                 new_state=s->state;
 625                                 s->state=state;
 626                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 627                                 s->state=new_state;
 628                                 }
 629                         }
 630                 skip=0;
 631                 }
 632 end:
 633         /* BIO_flush(s->wbio); */
 634
 635         s->in_handshake--;
 636         if (cb != NULL)
 637                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 638         return(ret);
 639         }
 640
 641 int dtls1_send_hello_request(SSL *s)
 642         {
 643         unsigned char *p;
 644
 645         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 646                 {
 647                 p=(unsigned char *)s->init_buf->data;
 648                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 649
 650                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 651                 /* number of bytes to write */
 652                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 653                 s->init_off=0;
 654
 655                 /* no need to buffer this message, since there are no retransmit
 656                  * requests for it */
 657                 }
 658
 659         /* SSL3_ST_SW_HELLO_REQ_B */
 660         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 661         }
 662
 663 int dtls1_send_hello_verify_request(SSL *s)
 664         {
 665         unsigned int msg_len;
 666         unsigned char *msg, *buf, *p;
 667
 668         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 669                 {
 670                 buf = (unsigned char *)s->init_buf->data;
 671
 672                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 673                 *(p++) = s->version >> 8;
 674                 *(p++) = s->version & 0xFF;
 675
 676                 if (s->ctx->app_gen_cookie_cb == NULL ||
 677                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 678                          &(s->d1->cookie_len)) == 0)
 679                         {
 680                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 681                         return 0;
 682                         }
 683
 684                 *(p++) = (unsigned char) s->d1->cookie_len;
 685                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 686                 p += s->d1->cookie_len;
 687                 msg_len = p - msg;
 688
 689                 dtls1_set_message_header(s, buf,
 690                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 691
 692                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 693                 /* number of bytes to write */
 694                 s->init_num=p-buf;
 695                 s->init_off=0;
 696
 697                 /* buffer the message to handle re-xmits */
 698                 dtls1_buffer_message(s, 0);
 699                 }
 700
 701         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 702         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 703         }
 704
 705 int dtls1_send_server_hello(SSL *s)
 706         {
 707         unsigned char *buf;
 708         unsigned char *p,*d;
 709         int i;
 710         unsigned int sl;
 711         unsigned long l,Time;
 712
 713         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 714                 {
 715                 buf=(unsigned char *)s->init_buf->data;
 716                 p=s->s3->server_random;
 717                 Time=(unsigned long)time(NULL);                 /* Time */
 718                 l2n(Time,p);
 719                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 720                 /* Do the message type and length last */
 721                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 722
 723                 *(p++)=s->version>>8;
 724                 *(p++)=s->version&0xff;
 725
 726                 /* Random stuff */
 727                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 728                 p+=SSL3_RANDOM_SIZE;
 729
 730                 /* now in theory we have 3 options to sending back the
 731                  * session id.  If it is a re-use, we send back the
 732                  * old session-id, if it is a new session, we send
 733                  * back the new session-id or we send back a 0 length
 734                  * session-id if we want it to be single use.
 735                  * Currently I will not implement the '0' length session-id
 736                  * 12-Jan-98 - I'll now support the '0' length stuff.
 737                  */
 738                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 739                         s->session->session_id_length=0;
 740
 741                 sl=s->session->session_id_length;
 742                 if (sl > sizeof s->session->session_id)
 743                         {
 744                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 745                         return -1;
 746                         }
 747                 *(p++)=sl;
 748                 memcpy(p,s->session->session_id,sl);
 749                 p+=sl;
 750
 751                 /* put the cipher */
 752                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 753                 p+=i;
 754
 755                 /* put the compression method */
 756 #ifdef OPENSSL_NO_COMP
 757                 *(p++)=0;
 758 #else
 759                 if (s->s3->tmp.new_compression == NULL)
 760                         *(p++)=0;
 761                 else
 762                         *(p++)=s->s3->tmp.new_compression->id;
 763 #endif
 764
 765                 /* do the header */
 766                 l=(p-d);
 767                 d=buf;
 768
 769                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 770
 771                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 772                 /* number of bytes to write */
 773                 s->init_num=p-buf;
 774                 s->init_off=0;
 775
 776                 /* buffer the message to handle re-xmits */
 777                 dtls1_buffer_message(s, 0);
 778                 }
 779
 780         /* SSL3_ST_SW_SRVR_HELLO_B */
 781         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 782         }
 783
 784 int dtls1_send_server_done(SSL *s)
 785         {
 786         unsigned char *p;
 787
 788         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 789                 {
 790                 p=(unsigned char *)s->init_buf->data;
 791
 792                 /* do the header */
 793                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 794
 795                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 796                 /* number of bytes to write */
 797                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 798                 s->init_off=0;
 799
 800                 /* buffer the message to handle re-xmits */
 801                 dtls1_buffer_message(s, 0);
 802                 }
 803
 804         /* SSL3_ST_SW_SRVR_DONE_B */
 805         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 806         }
 807
 808 int dtls1_send_server_key_exchange(SSL *s)
 809         {
 810 #ifndef OPENSSL_NO_RSA
 811         unsigned char *q;
 812         int j,num;
 813         RSA *rsa;
 814         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 815         unsigned int u;
 816 #endif
 817 #ifndef OPENSSL_NO_DH
 818         DH *dh=NULL,*dhp;
 819 #endif
 820 #ifndef OPENSSL_NO_ECDH
 821         EC_KEY *ecdh=NULL, *ecdhp;
 822         unsigned char *encodedPoint = NULL;
 823         int encodedlen = 0;
 824         int curve_id = 0;
 825         BN_CTX *bn_ctx = NULL;
 826 #endif
 827         EVP_PKEY *pkey;
 828         unsigned char *p,*d;
 829         int al,i;
 830         unsigned long type;
 831         int n;
 832         CERT *cert;
 833         BIGNUM *r[4];
 834         int nr[4],kn;
 835         BUF_MEM *buf;
 836         EVP_MD_CTX md_ctx;
 837
 838         EVP_MD_CTX_init(&md_ctx);
 839         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 840                 {
 841                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 842                 cert=s->cert;
 843
 844                 buf=s->init_buf;
 845
 846                 r[0]=r[1]=r[2]=r[3]=NULL;
 847                 n=0;
 848 #ifndef OPENSSL_NO_RSA
 849                 if (type & SSL_kRSA)
 850                         {
 851                         rsa=cert->rsa_tmp;
 852                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 853                                 {
 854                                 rsa=s->cert->rsa_tmp_cb(s,
 855                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 856                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 857                                 if(rsa == NULL)
 858                                 {
 859                                         al=SSL_AD_HANDSHAKE_FAILURE;
 860                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 861                                         goto f_err;
 862                                 }
 863                                 RSA_up_ref(rsa);
 864                                 cert->rsa_tmp=rsa;
 865                                 }
 866                         if (rsa == NULL)
 867                                 {
 868                                 al=SSL_AD_HANDSHAKE_FAILURE;
 869                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 870                                 goto f_err;
 871                                 }
 872                         r[0]=rsa->n;
 873                         r[1]=rsa->e;
 874                         s->s3->tmp.use_rsa_tmp=1;
 875                         }
 876                 else
 877 #endif
 878 #ifndef OPENSSL_NO_DH
 879                         if (type & SSL_kEDH)
 880                         {
 881                         dhp=cert->dh_tmp;
 882                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 883                                 dhp=s->cert->dh_tmp_cb(s,
 884                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 885                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 886                         if (dhp == NULL)
 887                                 {
 888                                 al=SSL_AD_HANDSHAKE_FAILURE;
 889                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 890                                 goto f_err;
 891                                 }
 892
 893                         if (s->s3->tmp.dh != NULL)
 894                                 {
 895                                 DH_free(dh);
 896                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 897                                 goto err;
 898                                 }
 899
 900                         if ((dh=DHparams_dup(dhp)) == NULL)
 901                                 {
 902                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 903                                 goto err;
 904                                 }
 905
 906                         s->s3->tmp.dh=dh;
 907                         if ((dhp->pub_key == NULL ||
 908                              dhp->priv_key == NULL ||
 909                              (s->options & SSL_OP_SINGLE_DH_USE)))
 910                                 {
 911                                 if(!DH_generate_key(dh))
 912                                     {
 913                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 914                                            ERR_R_DH_LIB);
 915                                     goto err;
 916                                     }
 917                                 }
 918                         else
 919                                 {
 920                                 dh->pub_key=BN_dup(dhp->pub_key);
 921                                 dh->priv_key=BN_dup(dhp->priv_key);
 922                                 if ((dh->pub_key == NULL) ||
 923                                         (dh->priv_key == NULL))
 924                                         {
 925                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 926                                         goto err;
 927                                         }
 928                                 }
 929                         r[0]=dh->p;
 930                         r[1]=dh->g;
 931                         r[2]=dh->pub_key;
 932                         }
 933                 else
 934 #endif
 935 #ifndef OPENSSL_NO_ECDH
 936                         if (type & SSL_kEECDH)
 937                         {
 938                         const EC_GROUP *group;
 939
 940                         ecdhp=cert->ecdh_tmp;
 941                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
 942                                 {
 943                                 ecdhp=s->cert->ecdh_tmp_cb(s,
 944                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 945                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 946                                 }
 947                         if (ecdhp == NULL)
 948                                 {
 949                                 al=SSL_AD_HANDSHAKE_FAILURE;
 950                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
 951                                 goto f_err;
 952                                 }
 953
 954                         if (s->s3->tmp.ecdh != NULL)
 955                                 {
 956                                 EC_KEY_free(s->s3->tmp.ecdh);
 957                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 958                                 goto err;
 959                                 }
 960
 961                         /* Duplicate the ECDH structure. */
 962                         if (ecdhp == NULL)
 963                                 {
 964                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 965                                 goto err;
 966                                 }
 967                         if (!EC_KEY_up_ref(ecdhp))
 968                                 {
 969                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 970                                 goto err;
 971                                 }
 972                         ecdh = ecdhp;
 973
 974                         s->s3->tmp.ecdh=ecdh;
 975                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
 976                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
 977                             (s->options & SSL_OP_SINGLE_ECDH_USE))
 978                                 {
 979                                 if(!EC_KEY_generate_key(ecdh))
 980                                     {
 981                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 982                                     goto err;
 983                                     }
 984                                 }
 985
 986                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
 987                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
 988                             (EC_KEY_get0_private_key(ecdh) == NULL))
 989                                 {
 990                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 991                                 goto err;
 992                                 }
 993
 994                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
 995                             (EC_GROUP_get_degree(group) > 163))
 996                                 {
 997                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
 998                                 goto err;
 999                                 }
1000
1001                         /* XXX: For now, we only support ephemeral ECDH
1002                          * keys over named (not generic) curves. For
1003                          * supported named curves, curve_id is non-zero.
1004                          */
1005                         if ((curve_id =
1006                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1007                             == 0)
1008                                 {
1009                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1010                                 goto err;
1011                                 }
1012
1013                         /* Encode the public key.
1014                          * First check the size of encoding and
1015                          * allocate memory accordingly.
1016                          */
1017                         encodedlen = EC_POINT_point2oct(group,
1018                             EC_KEY_get0_public_key(ecdh),
1019                             POINT_CONVERSION_UNCOMPRESSED,
1020                             NULL, 0, NULL);
1021
1022                         encodedPoint = (unsigned char *)
1023                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1024                         bn_ctx = BN_CTX_new();
1025                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1026                                 {
1027                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1028                                 goto err;
1029                                 }
1030
1031
1032                         encodedlen = EC_POINT_point2oct(group,
1033                             EC_KEY_get0_public_key(ecdh),
1034                             POINT_CONVERSION_UNCOMPRESSED,
1035                             encodedPoint, encodedlen, bn_ctx);
1036
1037                         if (encodedlen == 0)
1038                                 {
1039                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1040                                 goto err;
1041                                 }
1042
1043                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1044
1045                         /* XXX: For now, we only support named (not
1046                          * generic) curves in ECDH ephemeral key exchanges.
1047                          * In this situation, we need four additional bytes
1048                          * to encode the entire ServerECDHParams
1049                          * structure.
1050                          */
1051                         n = 4 + encodedlen;
1052
1053                         /* We'll generate the serverKeyExchange message
1054                          * explicitly so we can set these to NULLs
1055                          */
1056                         r[0]=NULL;
1057                         r[1]=NULL;
1058                         r[2]=NULL;
1059                         r[3]=NULL;
1060                         }
1061                 else
1062 #endif /* !OPENSSL_NO_ECDH */
1063 #ifndef OPENSSL_NO_PSK
1064                         if (type & SSL_kPSK)
1065                                 {
1066                                 /* reserve size for record length and PSK identity hint*/
1067                                 n+=2+strlen(s->ctx->psk_identity_hint);
1068                                 }
1069                         else
1070 #endif /* !OPENSSL_NO_PSK */
1071                         {
1072                         al=SSL_AD_HANDSHAKE_FAILURE;
1073                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1074                         goto f_err;
1075                         }
1076                 for (i=0; r[i] != NULL; i++)
1077                         {
1078                         nr[i]=BN_num_bytes(r[i]);
1079                         n+=2+nr[i];
1080                         }
1081
1082                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1083                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1084                         {
1085                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1086                                 == NULL)
1087                                 {
1088                                 al=SSL_AD_DECODE_ERROR;
1089                                 goto f_err;
1090                                 }
1091                         kn=EVP_PKEY_size(pkey);
1092                         }
1093                 else
1094                         {
1095                         pkey=NULL;
1096                         kn=0;
1097                         }
1098
1099                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1100                         {
1101                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1102                         goto err;
1103                         }
1104                 d=(unsigned char *)s->init_buf->data;
1105                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1106
1107                 for (i=0; r[i] != NULL; i++)
1108                         {
1109                         s2n(nr[i],p);
1110                         BN_bn2bin(r[i],p);
1111                         p+=nr[i];
1112                         }
1113
1114 #ifndef OPENSSL_NO_ECDH
1115                 if (type & SSL_kEECDH)
1116                         {
1117                         /* XXX: For now, we only support named (not generic) curves.
1118                          * In this situation, the serverKeyExchange message has:
1119                          * [1 byte CurveType], [2 byte CurveName]
1120                          * [1 byte length of encoded point], followed by
1121                          * the actual encoded point itself
1122                          */
1123                         *p = NAMED_CURVE_TYPE;
1124                         p += 1;
1125                         *p = 0;
1126                         p += 1;
1127                         *p = curve_id;
1128                         p += 1;
1129                         *p = encodedlen;
1130                         p += 1;
1131                         memcpy((unsigned char*)p,
1132                             (unsigned char *)encodedPoint,
1133                             encodedlen);
1134                         OPENSSL_free(encodedPoint);
1135                         p += encodedlen;
1136                         }
1137 #endif
1138
1139 #ifndef OPENSSL_NO_PSK
1140                 if (type & SSL_kPSK)
1141                         {
1142                         /* copy PSK identity hint */
1143                         s2n(strlen(s->ctx->psk_identity_hint), p);
1144                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1145                         p+=strlen(s->ctx->psk_identity_hint);
1146                         }
1147 #endif
1148
1149                 /* not anonymous */
1150                 if (pkey != NULL)
1151                         {
1152                         /* n is the length of the params, they start at
1153                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1154                          * at the end. */
1155 #ifndef OPENSSL_NO_RSA
1156                         if (pkey->type == EVP_PKEY_RSA)
1157                                 {
1158                                 q=md_buf;
1159                                 j=0;
1160                                 for (num=2; num > 0; num--)
1161                                         {
1162                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1163                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1164                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1165                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1166                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1167                                         EVP_DigestFinal_ex(&md_ctx,q,
1168                                                 (unsigned int *)&i);
1169                                         q+=i;
1170                                         j+=i;
1171                                         }
1172                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1173                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1174                                         {
1175                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1176                                         goto err;
1177                                         }
1178                                 s2n(u,p);
1179                                 n+=u+2;
1180                                 }
1181                         else
1182 #endif
1183 #if !defined(OPENSSL_NO_DSA)
1184                                 if (pkey->type == EVP_PKEY_DSA)
1185                                 {
1186                                 /* lets do DSS */
1187                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1188                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1189                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1190                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1191                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1192                                         (unsigned int *)&i,pkey))
1193                                         {
1194                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1195                                         goto err;
1196                                         }
1197                                 s2n(i,p);
1198                                 n+=i+2;
1199                                 }
1200                         else
1201 #endif
1202 #if !defined(OPENSSL_NO_ECDSA)
1203                                 if (pkey->type == EVP_PKEY_EC)
1204                                 {
1205                                 /* let's do ECDSA */
1206                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1207                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1208                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1209                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1210                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1211                                         (unsigned int *)&i,pkey))
1212                                         {
1213                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1214                                         goto err;
1215                                         }
1216                                 s2n(i,p);
1217                                 n+=i+2;
1218                                 }
1219                         else
1220 #endif
1221                                 {
1222                                 /* Is this error check actually needed? */
1223                                 al=SSL_AD_HANDSHAKE_FAILURE;
1224                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1225                                 goto f_err;
1226                                 }
1227                         }
1228
1229                 d = dtls1_set_message_header(s, d,
1230                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1231
1232                 /* we should now have things packed up, so lets send
1233                  * it off */
1234                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1235                 s->init_off=0;
1236
1237                 /* buffer the message to handle re-xmits */
1238                 dtls1_buffer_message(s, 0);
1239                 }
1240
1241         s->state = SSL3_ST_SW_KEY_EXCH_B;
1242         EVP_MD_CTX_cleanup(&md_ctx);
1243         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1244 f_err:
1245         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1246 err:
1247 #ifndef OPENSSL_NO_ECDH
1248         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1249         BN_CTX_free(bn_ctx);
1250 #endif
1251         EVP_MD_CTX_cleanup(&md_ctx);
1252         return(-1);
1253         }
1254
1255 int dtls1_send_certificate_request(SSL *s)
1256         {
1257         unsigned char *p,*d;
1258         int i,j,nl,off,n;
1259         STACK_OF(X509_NAME) *sk=NULL;
1260         X509_NAME *name;
1261         BUF_MEM *buf;
1262         unsigned int msg_len;
1263
1264         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1265                 {
1266                 buf=s->init_buf;
1267
1268                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1269
1270                 /* get the list of acceptable cert types */
1271                 p++;
1272                 n=ssl3_get_req_cert_type(s,p);
1273                 d[0]=n;
1274                 p+=n;
1275                 n++;
1276
1277                 off=n;
1278                 p+=2;
1279                 n+=2;
1280
1281                 sk=SSL_get_client_CA_list(s);
1282                 nl=0;
1283                 if (sk != NULL)
1284                         {
1285                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1286                                 {
1287                                 name=sk_X509_NAME_value(sk,i);
1288                                 j=i2d_X509_NAME(name,NULL);
1289                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1290                                         {
1291                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1292                                         goto err;
1293                                         }
1294                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1295                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1296                                         {
1297                                         s2n(j,p);
1298                                         i2d_X509_NAME(name,&p);
1299                                         n+=2+j;
1300                                         nl+=2+j;
1301                                         }
1302                                 else
1303                                         {
1304                                         d=p;
1305                                         i2d_X509_NAME(name,&p);
1306                                         j-=2; s2n(j,d); j+=2;
1307                                         n+=j;
1308                                         nl+=j;
1309                                         }
1310                                 }
1311                         }
1312                 /* else no CA names */
1313                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1314                 s2n(nl,p);
1315
1316                 d=(unsigned char *)buf->data;
1317                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1318                 l2n3(n,d);
1319                 s2n(s->d1->handshake_write_seq,d);
1320                 s->d1->handshake_write_seq++;
1321
1322                 /* we should now have things packed up, so lets send
1323                  * it off */
1324
1325                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1326                 s->init_off=0;
1327 #ifdef NETSCAPE_HANG_BUG
1328 /* XXX: what to do about this? */
1329                 p=(unsigned char *)s->init_buf->data + s->init_num;
1330
1331                 /* do the header */
1332                 *(p++)=SSL3_MT_SERVER_DONE;
1333                 *(p++)=0;
1334                 *(p++)=0;
1335                 *(p++)=0;
1336                 s->init_num += 4;
1337 #endif
1338
1339                 /* XDTLS:  set message header ? */
1340                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1341                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1342                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1343
1344                 /* buffer the message to handle re-xmits */
1345                 dtls1_buffer_message(s, 0);
1346
1347                 s->state = SSL3_ST_SW_CERT_REQ_B;
1348                 }
1349
1350         /* SSL3_ST_SW_CERT_REQ_B */
1351         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1352 err:
1353         return(-1);
1354         }
1355
1356 int dtls1_send_server_certificate(SSL *s)
1357         {
1358         unsigned long l;
1359         X509 *x;
1360
1361         if (s->state == SSL3_ST_SW_CERT_A)
1362                 {
1363                 x=ssl_get_server_send_cert(s);
1364                 if (x == NULL)
1365                         {
1366                         /* VRS: allow null cert if auth == KRB5 */
1367                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1368                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1369                                 {
1370                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1371                                 return(0);
1372                                 }
1373                         }
1374
1375                 l=dtls1_output_cert_chain(s,x);
1376                 s->state=SSL3_ST_SW_CERT_B;
1377                 s->init_num=(int)l;
1378                 s->init_off=0;
1379
1380                 /* buffer the message to handle re-xmits */
1381                 dtls1_buffer_message(s, 0);
1382                 }
1383
1384         /* SSL3_ST_SW_CERT_B */
1385         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1386         }