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