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