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                         s->d1->change_cipher_spec_ok = 1;
 501                         /* we should decide if we expected this one */
 502                         ret=ssl3_get_cert_verify(s);
 503                         if (ret <= 0) goto end;
 504                         dtls1_stop_timer(s);
 505
 506                         s->state=SSL3_ST_SR_FINISHED_A;
 507                         s->init_num=0;
 508                         break;
 509
 510                 case SSL3_ST_SR_FINISHED_A:
 511                 case SSL3_ST_SR_FINISHED_B:
 512                         s->d1->change_cipher_spec_ok = 1;
 513                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 514                                 SSL3_ST_SR_FINISHED_B);
 515                         if (ret <= 0) goto end;
 516                         dtls1_stop_timer(s);
 517                         if (s->hit)
 518                                 s->state=SSL_ST_OK;
 519                         else
 520                                 s->state=SSL3_ST_SW_CHANGE_A;
 521                         s->init_num=0;
 522                         break;
 523
 524                 case SSL3_ST_SW_CHANGE_A:
 525                 case SSL3_ST_SW_CHANGE_B:
 526
 527                         s->session->cipher=s->s3->tmp.new_cipher;
 528                         if (!s->method->ssl3_enc->setup_key_block(s))
 529                                 { ret= -1; goto end; }
 530
 531                         ret=dtls1_send_change_cipher_spec(s,
 532                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 533
 534                         if (ret <= 0) goto end;
 535                         s->state=SSL3_ST_SW_FINISHED_A;
 536                         s->init_num=0;
 537
 538                         if (!s->method->ssl3_enc->change_cipher_state(s,
 539                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 540                                 {
 541                                 ret= -1;
 542                                 goto end;
 543                                 }
 544
 545                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
 546                         break;
 547
 548                 case SSL3_ST_SW_FINISHED_A:
 549                 case SSL3_ST_SW_FINISHED_B:
 550                         ret=dtls1_send_finished(s,
 551                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 552                                 s->method->ssl3_enc->server_finished_label,
 553                                 s->method->ssl3_enc->server_finished_label_len);
 554                         if (ret <= 0) goto end;
 555                         s->state=SSL3_ST_SW_FLUSH;
 556                         if (s->hit)
 557                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 558                         else
 559                                 s->s3->tmp.next_state=SSL_ST_OK;
 560                         s->init_num=0;
 561                         break;
 562
 563                 case SSL_ST_OK:
 564                         /* clean a few things up */
 565                         ssl3_cleanup_key_block(s);
 566
 567 #if 0
 568                         BUF_MEM_free(s->init_buf);
 569                         s->init_buf=NULL;
 570 #endif
 571
 572                         /* remove buffering on output */
 573                         ssl_free_wbio_buffer(s);
 574
 575                         s->init_num=0;
 576
 577                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 578                                 {
 579                                 /* actually not necessarily a 'new' session unless
 580                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 581
 582                                 s->new_session=0;
 583
 584                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 585
 586                                 s->ctx->stats.sess_accept_good++;
 587                                 /* s->server=1; */
 588                                 s->handshake_func=dtls1_accept;
 589
 590                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 591                                 }
 592
 593                         ret = 1;
 594
 595                         /* done handshaking, next message is client hello */
 596                         s->d1->handshake_read_seq = 0;
 597                         /* next message is server hello */
 598                         s->d1->handshake_write_seq = 0;
 599                         s->d1->next_handshake_write_seq = 0;
 600                         goto end;
 601                         /* break; */
 602
 603                 default:
 604                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
 605                         ret= -1;
 606                         goto end;
 607                         /* break; */
 608                         }
 609
 610                 if (!s->s3->tmp.reuse_message && !skip)
 611                         {
 612                         if (s->debug)
 613                                 {
 614                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 615                                         goto end;
 616                                 }
 617
 618
 619                         if ((cb != NULL) && (s->state != state))
 620                                 {
 621                                 new_state=s->state;
 622                                 s->state=state;
 623                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 624                                 s->state=new_state;
 625                                 }
 626                         }
 627                 skip=0;
 628                 }
 629 end:
 630         /* BIO_flush(s->wbio); */
 631
 632         s->in_handshake--;
 633         if (cb != NULL)
 634                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 635         return(ret);
 636         }
 637
 638 int dtls1_send_hello_request(SSL *s)
 639         {
 640         unsigned char *p;
 641
 642         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 643                 {
 644                 p=(unsigned char *)s->init_buf->data;
 645                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
 646
 647                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 648                 /* number of bytes to write */
 649                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 650                 s->init_off=0;
 651
 652                 /* no need to buffer this message, since there are no retransmit
 653                  * requests for it */
 654                 }
 655
 656         /* SSL3_ST_SW_HELLO_REQ_B */
 657         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 658         }
 659
 660 int dtls1_send_hello_verify_request(SSL *s)
 661         {
 662         unsigned int msg_len;
 663         unsigned char *msg, *buf, *p;
 664
 665         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
 666                 {
 667                 buf = (unsigned char *)s->init_buf->data;
 668
 669                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
 670                 *(p++) = s->version >> 8;
 671                 *(p++) = s->version & 0xFF;
 672
 673                 if (s->ctx->app_gen_cookie_cb != NULL &&
 674                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
 675                         &(s->d1->cookie_len)) == 0)
 676                         {
 677                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
 678                         return 0;
 679                         }
 680                 /* else the cookie is assumed to have
 681                  * been initialized by the application */
 682
 683                 *(p++) = (unsigned char) s->d1->cookie_len;
 684                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
 685                 p += s->d1->cookie_len;
 686                 msg_len = p - msg;
 687
 688                 dtls1_set_message_header(s, buf,
 689                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
 690
 691                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
 692                 /* number of bytes to write */
 693                 s->init_num=p-buf;
 694                 s->init_off=0;
 695
 696                 /* buffer the message to handle re-xmits */
 697                 dtls1_buffer_message(s, 0);
 698                 }
 699
 700         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
 701         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 702         }
 703
 704 int dtls1_send_server_hello(SSL *s)
 705         {
 706         unsigned char *buf;
 707         unsigned char *p,*d;
 708         int i;
 709         unsigned int sl;
 710         unsigned long l,Time;
 711
 712         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 713                 {
 714                 buf=(unsigned char *)s->init_buf->data;
 715                 p=s->s3->server_random;
 716                 Time=(unsigned long)time(NULL);                 /* Time */
 717                 l2n(Time,p);
 718                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 719                 /* Do the message type and length last */
 720                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
 721
 722                 *(p++)=s->version>>8;
 723                 *(p++)=s->version&0xff;
 724
 725                 /* Random stuff */
 726                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
 727                 p+=SSL3_RANDOM_SIZE;
 728
 729                 /* now in theory we have 3 options to sending back the
 730                  * session id.  If it is a re-use, we send back the
 731                  * old session-id, if it is a new session, we send
 732                  * back the new session-id or we send back a 0 length
 733                  * session-id if we want it to be single use.
 734                  * Currently I will not implement the '0' length session-id
 735                  * 12-Jan-98 - I'll now support the '0' length stuff.
 736                  */
 737                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
 738                         s->session->session_id_length=0;
 739
 740                 sl=s->session->session_id_length;
 741                 if (sl > sizeof s->session->session_id)
 742                         {
 743                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
 744                         return -1;
 745                         }
 746                 *(p++)=sl;
 747                 memcpy(p,s->session->session_id,sl);
 748                 p+=sl;
 749
 750                 /* put the cipher */
 751                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
 752                 p+=i;
 753
 754                 /* put the compression method */
 755 #ifdef OPENSSL_NO_COMP
 756                 *(p++)=0;
 757 #else
 758                 if (s->s3->tmp.new_compression == NULL)
 759                         *(p++)=0;
 760                 else
 761                         *(p++)=s->s3->tmp.new_compression->id;
 762 #endif
 763
 764                 /* do the header */
 765                 l=(p-d);
 766                 d=buf;
 767
 768                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
 769
 770                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
 771                 /* number of bytes to write */
 772                 s->init_num=p-buf;
 773                 s->init_off=0;
 774
 775                 /* buffer the message to handle re-xmits */
 776                 dtls1_buffer_message(s, 0);
 777                 }
 778
 779         /* SSL3_ST_SW_SRVR_HELLO_B */
 780         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 781         }
 782
 783 int dtls1_send_server_done(SSL *s)
 784         {
 785         unsigned char *p;
 786
 787         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
 788                 {
 789                 p=(unsigned char *)s->init_buf->data;
 790
 791                 /* do the header */
 792                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
 793
 794                 s->state=SSL3_ST_SW_SRVR_DONE_B;
 795                 /* number of bytes to write */
 796                 s->init_num=DTLS1_HM_HEADER_LENGTH;
 797                 s->init_off=0;
 798
 799                 /* buffer the message to handle re-xmits */
 800                 dtls1_buffer_message(s, 0);
 801                 }
 802
 803         /* SSL3_ST_SW_SRVR_DONE_B */
 804         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
 805         }
 806
 807 int dtls1_send_server_key_exchange(SSL *s)
 808         {
 809 #ifndef OPENSSL_NO_RSA
 810         unsigned char *q;
 811         int j,num;
 812         RSA *rsa;
 813         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
 814         unsigned int u;
 815 #endif
 816 #ifndef OPENSSL_NO_DH
 817         DH *dh=NULL,*dhp;
 818 #endif
 819 #ifndef OPENSSL_NO_ECDH
 820         EC_KEY *ecdh=NULL, *ecdhp;
 821         unsigned char *encodedPoint = NULL;
 822         int encodedlen = 0;
 823         int curve_id = 0;
 824         BN_CTX *bn_ctx = NULL;
 825 #endif
 826         EVP_PKEY *pkey;
 827         unsigned char *p,*d;
 828         int al,i;
 829         unsigned long type;
 830         int n;
 831         CERT *cert;
 832         BIGNUM *r[4];
 833         int nr[4],kn;
 834         BUF_MEM *buf;
 835         EVP_MD_CTX md_ctx;
 836
 837         EVP_MD_CTX_init(&md_ctx);
 838         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
 839                 {
 840                 type=s->s3->tmp.new_cipher->algorithm_mkey;
 841                 cert=s->cert;
 842
 843                 buf=s->init_buf;
 844
 845                 r[0]=r[1]=r[2]=r[3]=NULL;
 846                 n=0;
 847 #ifndef OPENSSL_NO_RSA
 848                 if (type & SSL_kRSA)
 849                         {
 850                         rsa=cert->rsa_tmp;
 851                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
 852                                 {
 853                                 rsa=s->cert->rsa_tmp_cb(s,
 854                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 855                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 856                                 if(rsa == NULL)
 857                                 {
 858                                         al=SSL_AD_HANDSHAKE_FAILURE;
 859                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
 860                                         goto f_err;
 861                                 }
 862                                 RSA_up_ref(rsa);
 863                                 cert->rsa_tmp=rsa;
 864                                 }
 865                         if (rsa == NULL)
 866                                 {
 867                                 al=SSL_AD_HANDSHAKE_FAILURE;
 868                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
 869                                 goto f_err;
 870                                 }
 871                         r[0]=rsa->n;
 872                         r[1]=rsa->e;
 873                         s->s3->tmp.use_rsa_tmp=1;
 874                         }
 875                 else
 876 #endif
 877 #ifndef OPENSSL_NO_DH
 878                         if (type & SSL_kEDH)
 879                         {
 880                         dhp=cert->dh_tmp;
 881                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
 882                                 dhp=s->cert->dh_tmp_cb(s,
 883                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 884                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 885                         if (dhp == NULL)
 886                                 {
 887                                 al=SSL_AD_HANDSHAKE_FAILURE;
 888                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
 889                                 goto f_err;
 890                                 }
 891
 892                         if (s->s3->tmp.dh != NULL)
 893                                 {
 894                                 DH_free(dh);
 895                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 896                                 goto err;
 897                                 }
 898
 899                         if ((dh=DHparams_dup(dhp)) == NULL)
 900                                 {
 901                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 902                                 goto err;
 903                                 }
 904
 905                         s->s3->tmp.dh=dh;
 906                         if ((dhp->pub_key == NULL ||
 907                              dhp->priv_key == NULL ||
 908                              (s->options & SSL_OP_SINGLE_DH_USE)))
 909                                 {
 910                                 if(!DH_generate_key(dh))
 911                                     {
 912                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
 913                                            ERR_R_DH_LIB);
 914                                     goto err;
 915                                     }
 916                                 }
 917                         else
 918                                 {
 919                                 dh->pub_key=BN_dup(dhp->pub_key);
 920                                 dh->priv_key=BN_dup(dhp->priv_key);
 921                                 if ((dh->pub_key == NULL) ||
 922                                         (dh->priv_key == NULL))
 923                                         {
 924                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
 925                                         goto err;
 926                                         }
 927                                 }
 928                         r[0]=dh->p;
 929                         r[1]=dh->g;
 930                         r[2]=dh->pub_key;
 931                         }
 932                 else
 933 #endif
 934 #ifndef OPENSSL_NO_ECDH
 935                         if (type & SSL_kEECDH)
 936                         {
 937                         const EC_GROUP *group;
 938
 939                         ecdhp=cert->ecdh_tmp;
 940                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
 941                                 {
 942                                 ecdhp=s->cert->ecdh_tmp_cb(s,
 943                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
 944                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
 945                                 }
 946                         if (ecdhp == NULL)
 947                                 {
 948                                 al=SSL_AD_HANDSHAKE_FAILURE;
 949                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
 950                                 goto f_err;
 951                                 }
 952
 953                         if (s->s3->tmp.ecdh != NULL)
 954                                 {
 955                                 EC_KEY_free(s->s3->tmp.ecdh);
 956                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
 957                                 goto err;
 958                                 }
 959
 960                         /* Duplicate the ECDH structure. */
 961                         if (ecdhp == NULL)
 962                                 {
 963                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 964                                 goto err;
 965                                 }
 966                         if (!EC_KEY_up_ref(ecdhp))
 967                                 {
 968                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 969                                 goto err;
 970                                 }
 971                         ecdh = ecdhp;
 972
 973                         s->s3->tmp.ecdh=ecdh;
 974                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
 975                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
 976                             (s->options & SSL_OP_SINGLE_ECDH_USE))
 977                                 {
 978                                 if(!EC_KEY_generate_key(ecdh))
 979                                     {
 980                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 981                                     goto err;
 982                                     }
 983                                 }
 984
 985                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
 986                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
 987                             (EC_KEY_get0_private_key(ecdh) == NULL))
 988                                 {
 989                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
 990                                 goto err;
 991                                 }
 992
 993                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
 994                             (EC_GROUP_get_degree(group) > 163))
 995                                 {
 996                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
 997                                 goto err;
 998                                 }
 999
1000                         /* XXX: For now, we only support ephemeral ECDH
1001                          * keys over named (not generic) curves. For
1002                          * supported named curves, curve_id is non-zero.
1003                          */
1004                         if ((curve_id =
1005                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1006                             == 0)
1007                                 {
1008                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1009                                 goto err;
1010                                 }
1011
1012                         /* Encode the public key.
1013                          * First check the size of encoding and
1014                          * allocate memory accordingly.
1015                          */
1016                         encodedlen = EC_POINT_point2oct(group,
1017                             EC_KEY_get0_public_key(ecdh),
1018                             POINT_CONVERSION_UNCOMPRESSED,
1019                             NULL, 0, NULL);
1020
1021                         encodedPoint = (unsigned char *)
1022                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1023                         bn_ctx = BN_CTX_new();
1024                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1027                                 goto err;
1028                                 }
1029
1030
1031                         encodedlen = EC_POINT_point2oct(group,
1032                             EC_KEY_get0_public_key(ecdh),
1033                             POINT_CONVERSION_UNCOMPRESSED,
1034                             encodedPoint, encodedlen, bn_ctx);
1035
1036                         if (encodedlen == 0)
1037                                 {
1038                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039                                 goto err;
1040                                 }
1041
1042                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1043
1044                         /* XXX: For now, we only support named (not
1045                          * generic) curves in ECDH ephemeral key exchanges.
1046                          * In this situation, we need four additional bytes
1047                          * to encode the entire ServerECDHParams
1048                          * structure.
1049                          */
1050                         n = 4 + encodedlen;
1051
1052                         /* We'll generate the serverKeyExchange message
1053                          * explicitly so we can set these to NULLs
1054                          */
1055                         r[0]=NULL;
1056                         r[1]=NULL;
1057                         r[2]=NULL;
1058                         r[3]=NULL;
1059                         }
1060                 else
1061 #endif /* !OPENSSL_NO_ECDH */
1062 #ifndef OPENSSL_NO_PSK
1063                         if (type & SSL_kPSK)
1064                                 {
1065                                 /* reserve size for record length and PSK identity hint*/
1066                                 n+=2+strlen(s->ctx->psk_identity_hint);
1067                                 }
1068                         else
1069 #endif /* !OPENSSL_NO_PSK */
1070                         {
1071                         al=SSL_AD_HANDSHAKE_FAILURE;
1072                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1073                         goto f_err;
1074                         }
1075                 for (i=0; r[i] != NULL; i++)
1076                         {
1077                         nr[i]=BN_num_bytes(r[i]);
1078                         n+=2+nr[i];
1079                         }
1080
1081                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1082                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1083                         {
1084                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1085                                 == NULL)
1086                                 {
1087                                 al=SSL_AD_DECODE_ERROR;
1088                                 goto f_err;
1089                                 }
1090                         kn=EVP_PKEY_size(pkey);
1091                         }
1092                 else
1093                         {
1094                         pkey=NULL;
1095                         kn=0;
1096                         }
1097
1098                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1099                         {
1100                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1101                         goto err;
1102                         }
1103                 d=(unsigned char *)s->init_buf->data;
1104                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1105
1106                 for (i=0; r[i] != NULL; i++)
1107                         {
1108                         s2n(nr[i],p);
1109                         BN_bn2bin(r[i],p);
1110                         p+=nr[i];
1111                         }
1112
1113 #ifndef OPENSSL_NO_ECDH
1114                 if (type & SSL_kEECDH)
1115                         {
1116                         /* XXX: For now, we only support named (not generic) curves.
1117                          * In this situation, the serverKeyExchange message has:
1118                          * [1 byte CurveType], [2 byte CurveName]
1119                          * [1 byte length of encoded point], followed by
1120                          * the actual encoded point itself
1121                          */
1122                         *p = NAMED_CURVE_TYPE;
1123                         p += 1;
1124                         *p = 0;
1125                         p += 1;
1126                         *p = curve_id;
1127                         p += 1;
1128                         *p = encodedlen;
1129                         p += 1;
1130                         memcpy((unsigned char*)p,
1131                             (unsigned char *)encodedPoint,
1132                             encodedlen);
1133                         OPENSSL_free(encodedPoint);
1134                         p += encodedlen;
1135                         }
1136 #endif
1137
1138 #ifndef OPENSSL_NO_PSK
1139                 if (type & SSL_kPSK)
1140                         {
1141                         /* copy PSK identity hint */
1142                         s2n(strlen(s->ctx->psk_identity_hint), p);
1143                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1144                         p+=strlen(s->ctx->psk_identity_hint);
1145                         }
1146 #endif
1147
1148                 /* not anonymous */
1149                 if (pkey != NULL)
1150                         {
1151                         /* n is the length of the params, they start at
1152                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1153                          * at the end. */
1154 #ifndef OPENSSL_NO_RSA
1155                         if (pkey->type == EVP_PKEY_RSA)
1156                                 {
1157                                 q=md_buf;
1158                                 j=0;
1159                                 for (num=2; num > 0; num--)
1160                                         {
1161                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1162                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1163                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1164                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1165                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1166                                         EVP_DigestFinal_ex(&md_ctx,q,
1167                                                 (unsigned int *)&i);
1168                                         q+=i;
1169                                         j+=i;
1170                                         }
1171                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1172                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1173                                         {
1174                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1175                                         goto err;
1176                                         }
1177                                 s2n(u,p);
1178                                 n+=u+2;
1179                                 }
1180                         else
1181 #endif
1182 #if !defined(OPENSSL_NO_DSA)
1183                                 if (pkey->type == EVP_PKEY_DSA)
1184                                 {
1185                                 /* lets do DSS */
1186                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1187                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1188                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1189                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1190                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1191                                         (unsigned int *)&i,pkey))
1192                                         {
1193                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1194                                         goto err;
1195                                         }
1196                                 s2n(i,p);
1197                                 n+=i+2;
1198                                 }
1199                         else
1200 #endif
1201 #if !defined(OPENSSL_NO_ECDSA)
1202                                 if (pkey->type == EVP_PKEY_EC)
1203                                 {
1204                                 /* let's do ECDSA */
1205                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1206                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1209                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1210                                         (unsigned int *)&i,pkey))
1211                                         {
1212                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1213                                         goto err;
1214                                         }
1215                                 s2n(i,p);
1216                                 n+=i+2;
1217                                 }
1218                         else
1219 #endif
1220                                 {
1221                                 /* Is this error check actually needed? */
1222                                 al=SSL_AD_HANDSHAKE_FAILURE;
1223                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1224                                 goto f_err;
1225                                 }
1226                         }
1227
1228                 d = dtls1_set_message_header(s, d,
1229                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1230
1231                 /* we should now have things packed up, so lets send
1232                  * it off */
1233                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1234                 s->init_off=0;
1235
1236                 /* buffer the message to handle re-xmits */
1237                 dtls1_buffer_message(s, 0);
1238                 }
1239
1240         s->state = SSL3_ST_SW_KEY_EXCH_B;
1241         EVP_MD_CTX_cleanup(&md_ctx);
1242         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1243 f_err:
1244         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1245 err:
1246 #ifndef OPENSSL_NO_ECDH
1247         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1248         BN_CTX_free(bn_ctx);
1249 #endif
1250         EVP_MD_CTX_cleanup(&md_ctx);
1251         return(-1);
1252         }
1253
1254 int dtls1_send_certificate_request(SSL *s)
1255         {
1256         unsigned char *p,*d;
1257         int i,j,nl,off,n;
1258         STACK_OF(X509_NAME) *sk=NULL;
1259         X509_NAME *name;
1260         BUF_MEM *buf;
1261         unsigned int msg_len;
1262
1263         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1264                 {
1265                 buf=s->init_buf;
1266
1267                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1268
1269                 /* get the list of acceptable cert types */
1270                 p++;
1271                 n=ssl3_get_req_cert_type(s,p);
1272                 d[0]=n;
1273                 p+=n;
1274                 n++;
1275
1276                 off=n;
1277                 p+=2;
1278                 n+=2;
1279
1280                 sk=SSL_get_client_CA_list(s);
1281                 nl=0;
1282                 if (sk != NULL)
1283                         {
1284                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1285                                 {
1286                                 name=sk_X509_NAME_value(sk,i);
1287                                 j=i2d_X509_NAME(name,NULL);
1288                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1289                                         {
1290                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1291                                         goto err;
1292                                         }
1293                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1294                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1295                                         {
1296                                         s2n(j,p);
1297                                         i2d_X509_NAME(name,&p);
1298                                         n+=2+j;
1299                                         nl+=2+j;
1300                                         }
1301                                 else
1302                                         {
1303                                         d=p;
1304                                         i2d_X509_NAME(name,&p);
1305                                         j-=2; s2n(j,d); j+=2;
1306                                         n+=j;
1307                                         nl+=j;
1308                                         }
1309                                 }
1310                         }
1311                 /* else no CA names */
1312                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1313                 s2n(nl,p);
1314
1315                 d=(unsigned char *)buf->data;
1316                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1317                 l2n3(n,d);
1318                 s2n(s->d1->handshake_write_seq,d);
1319                 s->d1->handshake_write_seq++;
1320
1321                 /* we should now have things packed up, so lets send
1322                  * it off */
1323
1324                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1325                 s->init_off=0;
1326 #ifdef NETSCAPE_HANG_BUG
1327 /* XXX: what to do about this? */
1328                 p=(unsigned char *)s->init_buf->data + s->init_num;
1329
1330                 /* do the header */
1331                 *(p++)=SSL3_MT_SERVER_DONE;
1332                 *(p++)=0;
1333                 *(p++)=0;
1334                 *(p++)=0;
1335                 s->init_num += 4;
1336 #endif
1337
1338                 /* XDTLS:  set message header ? */
1339                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1340                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1341                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1342
1343                 /* buffer the message to handle re-xmits */
1344                 dtls1_buffer_message(s, 0);
1345
1346                 s->state = SSL3_ST_SW_CERT_REQ_B;
1347                 }
1348
1349         /* SSL3_ST_SW_CERT_REQ_B */
1350         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1351 err:
1352         return(-1);
1353         }
1354
1355 int dtls1_send_server_certificate(SSL *s)
1356         {
1357         unsigned long l;
1358         X509 *x;
1359
1360         if (s->state == SSL3_ST_SW_CERT_A)
1361                 {
1362                 x=ssl_get_server_send_cert(s);
1363                 if (x == NULL)
1364                         {
1365                         /* VRS: allow null cert if auth == KRB5 */
1366                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1367                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1368                                 {
1369                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1370                                 return(0);
1371                                 }
1372                         }
1373
1374                 l=dtls1_output_cert_chain(s,x);
1375                 s->state=SSL3_ST_SW_CERT_B;
1376                 s->init_num=(int)l;
1377                 s->init_off=0;
1378
1379                 /* buffer the message to handle re-xmits */
1380                 dtls1_buffer_message(s, 0);
1381                 }
1382
1383         /* SSL3_ST_SW_CERT_B */
1384         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1385         }