ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver);
 168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 188         int ret= -1;
 189         int new_state,state,skip=0;
 190
 191         RAND_add(&Time,sizeof(Time),0);
 192         ERR_clear_error();
 193         clear_sys_error();
 194
 195         if (s->info_callback != NULL)
 196                 cb=s->info_callback;
 197         else if (s->ctx->info_callback != NULL)
 198                 cb=s->ctx->info_callback;
 199
 200         s->in_handshake++;
 201         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 202
 203         for (;;)
 204                 {
 205                 state=s->state;
 206
 207                 switch(s->state)
 208                         {
 209                 case SSL_ST_RENEGOTIATE:
 210                         s->renegotiate=1;
 211                         s->state=SSL_ST_CONNECT;
 212                         s->ctx->stats.sess_connect_renegotiate++;
 213                         /* break */
 214                 case SSL_ST_BEFORE:
 215                 case SSL_ST_CONNECT:
 216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 217                 case SSL_ST_OK|SSL_ST_CONNECT:
 218
 219                         s->server=0;
 220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 221
 222                         if ((s->version & 0xff00 ) != 0x0300)
 223                                 {
 224                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 225                                 ret = -1;
 226                                 goto end;
 227                                 }
 228
 229                         /* s->version=SSL3_VERSION; */
 230                         s->type=SSL_ST_CONNECT;
 231
 232                         if (s->init_buf == NULL)
 233                                 {
 234                                 if ((buf=BUF_MEM_new()) == NULL)
 235                                         {
 236                                         ret= -1;
 237                                         goto end;
 238                                         }
 239                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 240                                         {
 241                                         ret= -1;
 242                                         goto end;
 243                                         }
 244                                 s->init_buf=buf;
 245                                 buf=NULL;
 246                                 }
 247
 248                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 249
 250                         /* setup buffing BIO */
 251                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 252
 253                         /* don't push the buffering BIO quite yet */
 254
 255                         ssl3_init_finished_mac(s);
 256
 257                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 258                         s->ctx->stats.sess_connect++;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_CW_CLNT_HELLO_A:
 263                 case SSL3_ST_CW_CLNT_HELLO_B:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 269                         s->init_num=0;
 270
 271                         /* turn on buffering for the next lot of output */
 272                         if (s->bbio != s->wbio)
 273                                 s->wbio=BIO_push(s->bbio,s->wbio);
 274
 275                         break;
 276
 277                 case SSL3_ST_CR_SRVR_HELLO_A:
 278                 case SSL3_ST_CR_SRVR_HELLO_B:
 279                         ret=ssl3_get_server_hello(s);
 280 #ifndef OPENSSL_NO_SRP
 281                         if (ret == 0 && s->s3->warn_alert == SSL_AD_MISSING_SRP_USERNAME)
 282                                 {
 283                                 if (!SRP_have_to_put_srp_username(s))
 284                                         {
 285                                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_MISSING_SRP_USERNAME);
 286                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_USER_CANCELLED);
 287                                         goto end;
 288                                         }
 289                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 290                                 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 291                                 break;
 292                                 }
 293 #endif
 294                         if (ret <= 0) goto end;
 295
 296                         if (s->hit)
 297                                 s->state=SSL3_ST_CR_FINISHED_A;
 298                         else
 299                                 s->state=SSL3_ST_CR_CERT_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_CERT_A:
 304                 case SSL3_ST_CR_CERT_B:
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         ret=ssl3_check_finished(s);
 307                         if (ret <= 0) goto end;
 308                         if (ret == 2)
 309                                 {
 310                                 s->hit = 1;
 311                                 if (s->tlsext_ticket_expected)
 312                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 313                                 else
 314                                         s->state=SSL3_ST_CR_FINISHED_A;
 315                                 s->init_num=0;
 316                                 break;
 317                                 }
 318 #endif
 319                         /* Check if it is anon DH/ECDH */
 320                         /* or PSK */
 321                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 322                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 323                                 {
 324                                 ret=ssl3_get_server_certificate(s);
 325                                 if (ret <= 0) goto end;
 326 #ifndef OPENSSL_NO_TLSEXT
 327                                 if (s->tlsext_status_expected)
 328                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 329                                 else
 330                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 331                                 }
 332                         else
 333                                 {
 334                                 skip = 1;
 335                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 336                                 }
 337 #else
 338                                 }
 339                         else
 340                                 skip=1;
 341
 342                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 343 #endif
 344                         s->init_num=0;
 345                         break;
 346
 347                 case SSL3_ST_CR_KEY_EXCH_A:
 348                 case SSL3_ST_CR_KEY_EXCH_B:
 349                         ret=ssl3_get_key_exchange(s);
 350                         if (ret <= 0) goto end;
 351                         s->state=SSL3_ST_CR_CERT_REQ_A;
 352                         s->init_num=0;
 353
 354                         /* at this point we check that we have the
 355                          * required stuff from the server */
 356                         if (!ssl3_check_cert_and_algorithm(s))
 357                                 {
 358                                 ret= -1;
 359                                 goto end;
 360                                 }
 361                         break;
 362
 363                 case SSL3_ST_CR_CERT_REQ_A:
 364                 case SSL3_ST_CR_CERT_REQ_B:
 365                         ret=ssl3_get_certificate_request(s);
 366                         if (ret <= 0) goto end;
 367                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_CR_SRVR_DONE_A:
 372                 case SSL3_ST_CR_SRVR_DONE_B:
 373                         ret=ssl3_get_server_done(s);
 374                         if (ret <= 0) goto end;
 375 #ifndef OPENSSL_NO_SRP
 376                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 377                                 {
 378                                 if ((ret = SRP_Calc_A_param(s))<=0)
 379                                         {
 380                                         SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_SRP_A_CALC);
 381                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 382                                         goto end;
 383                                         }
 384                                 }
 385 #endif
 386                         if (s->s3->tmp.cert_req)
 387                                 s->state=SSL3_ST_CW_CERT_A;
 388                         else
 389                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 390                         s->init_num=0;
 391
 392                         break;
 393
 394                 case SSL3_ST_CW_CERT_A:
 395                 case SSL3_ST_CW_CERT_B:
 396                 case SSL3_ST_CW_CERT_C:
 397                 case SSL3_ST_CW_CERT_D:
 398                         ret=ssl3_send_client_certificate(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 401                         s->init_num=0;
 402                         break;
 403
 404                 case SSL3_ST_CW_KEY_EXCH_A:
 405                 case SSL3_ST_CW_KEY_EXCH_B:
 406                         ret=ssl3_send_client_key_exchange(s);
 407                         if (ret <= 0) goto end;
 408                         /* EAY EAY EAY need to check for DH fix cert
 409                          * sent back */
 410                         /* For TLS, cert_req is set to 2, so a cert chain
 411                          * of nothing is sent, but no verify packet is sent */
 412                         /* XXX: For now, we do not support client
 413                          * authentication in ECDH cipher suites with
 414                          * ECDH (rather than ECDSA) certificates.
 415                          * We need to skip the certificate verify
 416                          * message when client's ECDH public key is sent
 417                          * inside the client certificate.
 418                          */
 419                         if (s->s3->tmp.cert_req == 1)
 420                                 {
 421                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 422                                 }
 423                         else
 424                                 {
 425                                 s->state=SSL3_ST_CW_CHANGE_A;
 426                                 s->s3->change_cipher_spec=0;
 427                                 }
 428                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 429                                 {
 430                                 s->state=SSL3_ST_CW_CHANGE_A;
 431                                 s->s3->change_cipher_spec=0;
 432                                 }
 433
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_CW_CERT_VRFY_A:
 438                 case SSL3_ST_CW_CERT_VRFY_B:
 439                         ret=ssl3_send_client_verify(s);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_CW_CHANGE_A;
 442                         s->init_num=0;
 443                         s->s3->change_cipher_spec=0;
 444                         break;
 445
 446                 case SSL3_ST_CW_CHANGE_A:
 447                 case SSL3_ST_CW_CHANGE_B:
 448                         ret=ssl3_send_change_cipher_spec(s,
 449                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_FINISHED_A;
 452                         s->init_num=0;
 453
 454                         s->session->cipher=s->s3->tmp.new_cipher;
 455 #ifdef OPENSSL_NO_COMP
 456                         s->session->compress_meth=0;
 457 #else
 458                         if (s->s3->tmp.new_compression == NULL)
 459                                 s->session->compress_meth=0;
 460                         else
 461                                 s->session->compress_meth=
 462                                         s->s3->tmp.new_compression->id;
 463 #endif
 464                         if (!s->method->ssl3_enc->setup_key_block(s))
 465                                 {
 466                                 ret= -1;
 467                                 goto end;
 468                                 }
 469
 470                         if (!s->method->ssl3_enc->change_cipher_state(s,
 471                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 472                                 {
 473                                 ret= -1;
 474                                 goto end;
 475                                 }
 476
 477                         break;
 478
 479                 case SSL3_ST_CW_FINISHED_A:
 480                 case SSL3_ST_CW_FINISHED_B:
 481                         ret=ssl3_send_finished(s,
 482                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 483                                 s->method->ssl3_enc->client_finished_label,
 484                                 s->method->ssl3_enc->client_finished_label_len);
 485                         if (ret <= 0) goto end;
 486                         s->state=SSL3_ST_CW_FLUSH;
 487
 488                         /* clear flags */
 489                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 490                         if (s->hit)
 491                                 {
 492                                 s->s3->tmp.next_state=SSL_ST_OK;
 493                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 494                                         {
 495                                         s->state=SSL_ST_OK;
 496                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 497                                         s->s3->delay_buf_pop_ret=0;
 498                                         }
 499                                 }
 500                         else
 501                                 {
 502 #ifndef OPENSSL_NO_TLSEXT
 503                                 /* Allow NewSessionTicket if ticket expected */
 504                                 if (s->tlsext_ticket_expected)
 505                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 506                                 else
 507 #endif
 508
 509                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 510                                 }
 511                         s->init_num=0;
 512                         break;
 513
 514 #ifndef OPENSSL_NO_TLSEXT
 515                 case SSL3_ST_CR_SESSION_TICKET_A:
 516                 case SSL3_ST_CR_SESSION_TICKET_B:
 517                         ret=ssl3_get_new_session_ticket(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CR_FINISHED_A;
 520                         s->init_num=0;
 521                 break;
 522
 523                 case SSL3_ST_CR_CERT_STATUS_A:
 524                 case SSL3_ST_CR_CERT_STATUS_B:
 525                         ret=ssl3_get_cert_status(s);
 526                         if (ret <= 0) goto end;
 527                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 528                         s->init_num=0;
 529                 break;
 530 #endif
 531
 532                 case SSL3_ST_CR_FINISHED_A:
 533                 case SSL3_ST_CR_FINISHED_B:
 534
 535                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 536                                 SSL3_ST_CR_FINISHED_B);
 537                         if (ret <= 0) goto end;
 538
 539                         if (s->hit)
 540                                 s->state=SSL3_ST_CW_CHANGE_A;
 541                         else
 542                                 s->state=SSL_ST_OK;
 543                         s->init_num=0;
 544                         break;
 545
 546                 case SSL3_ST_CW_FLUSH:
 547                         s->rwstate=SSL_WRITING;
 548                         if (BIO_flush(s->wbio) <= 0)
 549                                 {
 550                                 ret= -1;
 551                                 goto end;
 552                                 }
 553                         s->rwstate=SSL_NOTHING;
 554                         s->state=s->s3->tmp.next_state;
 555                         break;
 556
 557                 case SSL_ST_OK:
 558                         /* clean a few things up */
 559                         ssl3_cleanup_key_block(s);
 560
 561                         if (s->init_buf != NULL)
 562                                 {
 563                                 BUF_MEM_free(s->init_buf);
 564                                 s->init_buf=NULL;
 565                                 }
 566
 567                         /* If we are not 'joining' the last two packets,
 568                          * remove the buffering now */
 569                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 570                                 ssl_free_wbio_buffer(s);
 571                         /* else do it later in ssl3_write */
 572
 573                         s->init_num=0;
 574                         s->renegotiate=0;
 575                         s->new_session=0;
 576
 577                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 578                         if (s->hit) s->ctx->stats.sess_hit++;
 579
 580                         ret=1;
 581                         /* s->server=0; */
 582                         s->handshake_func=ssl3_connect;
 583                         s->ctx->stats.sess_connect_good++;
 584
 585                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 586
 587                         goto end;
 588                         /* break; */
 589
 590                 default:
 591                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 592                         ret= -1;
 593                         goto end;
 594                         /* break; */
 595                         }
 596
 597                 /* did we do anything */
 598                 if (!s->s3->tmp.reuse_message && !skip)
 599                         {
 600                         if (s->debug)
 601                                 {
 602                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 603                                         goto end;
 604                                 }
 605
 606                         if ((cb != NULL) && (s->state != state))
 607                                 {
 608                                 new_state=s->state;
 609                                 s->state=state;
 610                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 611                                 s->state=new_state;
 612                                 }
 613                         }
 614                 skip=0;
 615                 }
 616 end:
 617         s->in_handshake--;
 618         if (buf != NULL)
 619                 BUF_MEM_free(buf);
 620         if (cb != NULL)
 621                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 622         return(ret);
 623         }
 624
 625
 626 int ssl3_client_hello(SSL *s)
 627         {
 628         unsigned char *buf;
 629         unsigned char *p,*d;
 630         int i;
 631         unsigned long Time,l;
 632 #ifndef OPENSSL_NO_COMP
 633         int j;
 634         SSL_COMP *comp;
 635 #endif
 636
 637         buf=(unsigned char *)s->init_buf->data;
 638         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 639                 {
 640                 SSL_SESSION *sess = s->session;
 641                 if ((sess == NULL) ||
 642                         (sess->ssl_version != s->version) ||
 643 #ifdef OPENSSL_NO_TLSEXT
 644                         !sess->session_id_length ||
 645 #else
 646                         (!sess->session_id_length && !sess->tlsext_tick) ||
 647 #endif
 648                         (sess->not_resumable))
 649                         {
 650                         if (!ssl_get_new_session(s,0))
 651                                 goto err;
 652                         }
 653                 /* else use the pre-loaded session */
 654
 655                 p=s->s3->client_random;
 656                 Time=(unsigned long)time(NULL);                 /* Time */
 657                 l2n(Time,p);
 658                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 659                         goto err;
 660
 661                 /* Do the message type and length last */
 662                 d=p= &(buf[4]);
 663
 664                 *(p++)=s->version>>8;
 665                 *(p++)=s->version&0xff;
 666                 s->client_version=s->version;
 667
 668                 /* Random stuff */
 669                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 670                 p+=SSL3_RANDOM_SIZE;
 671
 672                 /* Session ID */
 673                 if (s->new_session)
 674                         i=0;
 675                 else
 676                         i=s->session->session_id_length;
 677                 *(p++)=i;
 678                 if (i != 0)
 679                         {
 680                         if (i > (int)sizeof(s->session->session_id))
 681                                 {
 682                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 683                                 goto err;
 684                                 }
 685                         memcpy(p,s->session->session_id,i);
 686                         p+=i;
 687                         }
 688
 689                 /* Ciphers supported */
 690                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 691                 if (i == 0)
 692                         {
 693                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 694                         goto err;
 695                         }
 696                 s2n(i,p);
 697                 p+=i;
 698
 699                 /* COMPRESSION */
 700 #ifdef OPENSSL_NO_COMP
 701                 *(p++)=1;
 702 #else
 703
 704                 if ((s->options & SSL_OP_NO_COMPRESSION)
 705                                         || !s->ctx->comp_methods)
 706                         j=0;
 707                 else
 708                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 709                 *(p++)=1+j;
 710                 for (i=0; i<j; i++)
 711                         {
 712                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 713                         *(p++)=comp->id;
 714                         }
 715 #endif
 716                 *(p++)=0; /* Add the NULL method */
 717
 718 #ifndef OPENSSL_NO_TLSEXT
 719                 /* TLS extensions*/
 720                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 721                         {
 722                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 723                         goto err;
 724                         }
 725                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 726                         {
 727                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 728                         goto err;
 729                         }
 730 #endif
 731
 732                 l=(p-d);
 733                 d=buf;
 734                 *(d++)=SSL3_MT_CLIENT_HELLO;
 735                 l2n3(l,d);
 736
 737                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 738                 /* number of bytes to write */
 739                 s->init_num=p-buf;
 740                 s->init_off=0;
 741                 }
 742
 743         /* SSL3_ST_CW_CLNT_HELLO_B */
 744         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 745 err:
 746         return(-1);
 747         }
 748
 749 int ssl3_get_server_hello(SSL *s)
 750         {
 751         STACK_OF(SSL_CIPHER) *sk;
 752         const SSL_CIPHER *c;
 753         unsigned char *p,*d;
 754         int i,al,ok;
 755         unsigned int j;
 756         long n;
 757 #ifndef OPENSSL_NO_COMP
 758         SSL_COMP *comp;
 759 #endif
 760
 761         n=s->method->ssl_get_message(s,
 762                 SSL3_ST_CR_SRVR_HELLO_A,
 763                 SSL3_ST_CR_SRVR_HELLO_B,
 764                 -1,
 765                 20000, /* ?? */
 766                 &ok);
 767
 768         if (!ok) return((int)n);
 769
 770         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 771                 {
 772                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 773                         {
 774                         if ( s->d1->send_cookie == 0)
 775                                 {
 776                                 s->s3->tmp.reuse_message = 1;
 777                                 return 1;
 778                                 }
 779                         else /* already sent a cookie */
 780                                 {
 781                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 782                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 783                                 goto f_err;
 784                                 }
 785                         }
 786                 }
 787
 788         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 789                 {
 790                 al=SSL_AD_UNEXPECTED_MESSAGE;
 791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 792                 goto f_err;
 793                 }
 794
 795         d=p=(unsigned char *)s->init_msg;
 796
 797         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 798                 {
 799                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 800                 s->version=(s->version&0xff00)|p[1];
 801                 al=SSL_AD_PROTOCOL_VERSION;
 802                 goto f_err;
 803                 }
 804         p+=2;
 805
 806         /* load the server hello data */
 807         /* load the server random */
 808         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 809         p+=SSL3_RANDOM_SIZE;
 810
 811         /* get the session-id */
 812         j= *(p++);
 813
 814         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 815                 {
 816                 al=SSL_AD_ILLEGAL_PARAMETER;
 817                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 818                 goto f_err;
 819                 }
 820
 821 #ifndef OPENSSL_NO_TLSEXT
 822         /* check if we want to resume the session based on external pre-shared secret */
 823         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 824                 {
 825                 SSL_CIPHER *pref_cipher=NULL;
 826                 s->session->master_key_length=sizeof(s->session->master_key);
 827                 if (s->tls_session_secret_cb(s, s->session->master_key,
 828                                              &s->session->master_key_length,
 829                                              NULL, &pref_cipher,
 830                                              s->tls_session_secret_cb_arg))
 831                         {
 832                         s->session->cipher = pref_cipher ?
 833                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 834                         }
 835                 }
 836 #endif /* OPENSSL_NO_TLSEXT */
 837
 838         if (j != 0 && j == s->session->session_id_length
 839             && memcmp(p,s->session->session_id,j) == 0)
 840             {
 841             if(s->sid_ctx_length != s->session->sid_ctx_length
 842                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 843                 {
 844                 /* actually a client application bug */
 845                 al=SSL_AD_ILLEGAL_PARAMETER;
 846                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 847                 goto f_err;
 848                 }
 849             s->hit=1;
 850             }
 851         else    /* a miss or crap from the other end */
 852                 {
 853                 /* If we were trying for session-id reuse, make a new
 854                  * SSL_SESSION so we don't stuff up other people */
 855                 s->hit=0;
 856                 if (s->session->session_id_length > 0)
 857                         {
 858                         if (!ssl_get_new_session(s,0))
 859                                 {
 860                                 al=SSL_AD_INTERNAL_ERROR;
 861                                 goto f_err;
 862                                 }
 863                         }
 864                 s->session->session_id_length=j;
 865                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 866                 }
 867         p+=j;
 868         c=ssl_get_cipher_by_char(s,p);
 869         if (c == NULL)
 870                 {
 871                 /* unknown cipher */
 872                 al=SSL_AD_ILLEGAL_PARAMETER;
 873                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 874                 goto f_err;
 875                 }
 876         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 877
 878         sk=ssl_get_ciphers_by_id(s);
 879         i=sk_SSL_CIPHER_find(sk,c);
 880         if (i < 0)
 881                 {
 882                 /* we did not say we would use this cipher */
 883                 al=SSL_AD_ILLEGAL_PARAMETER;
 884                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 885                 goto f_err;
 886                 }
 887
 888         /* Depending on the session caching (internal/external), the cipher
 889            and/or cipher_id values may not be set. Make sure that
 890            cipher_id is set and use it for comparison. */
 891         if (s->session->cipher)
 892                 s->session->cipher_id = s->session->cipher->id;
 893         if (s->hit && (s->session->cipher_id != c->id))
 894                 {
 895 /* Workaround is now obsolete */
 896 #if 0
 897                 if (!(s->options &
 898                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 899 #endif
 900                         {
 901                         al=SSL_AD_ILLEGAL_PARAMETER;
 902                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 903                         goto f_err;
 904                         }
 905                 }
 906         s->s3->tmp.new_cipher=c;
 907         if (!ssl3_digest_cached_records(s))
 908                 goto f_err;
 909
 910         /* lets get the compression algorithm */
 911         /* COMPRESSION */
 912 #ifdef OPENSSL_NO_COMP
 913         if (*(p++) != 0)
 914                 {
 915                 al=SSL_AD_ILLEGAL_PARAMETER;
 916                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 917                 goto f_err;
 918                 }
 919         /* If compression is disabled we'd better not try to resume a session
 920          * using compression.
 921          */
 922         if (s->session->compress_meth != 0)
 923                 {
 924                 al=SSL_AD_INTERNAL_ERROR;
 925                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 926                 goto f_err;
 927                 }
 928 #else
 929         j= *(p++);
 930         if (s->hit && j != s->session->compress_meth)
 931                 {
 932                 al=SSL_AD_ILLEGAL_PARAMETER;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 934                 goto f_err;
 935                 }
 936         if (j == 0)
 937                 comp=NULL;
 938         else if (s->options & SSL_OP_NO_COMPRESSION)
 939                 {
 940                 al=SSL_AD_ILLEGAL_PARAMETER;
 941                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 942                 goto f_err;
 943                 }
 944         else
 945                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 946
 947         if ((j != 0) && (comp == NULL))
 948                 {
 949                 al=SSL_AD_ILLEGAL_PARAMETER;
 950                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 951                 goto f_err;
 952                 }
 953         else
 954                 {
 955                 s->s3->tmp.new_compression=comp;
 956                 }
 957 #endif
 958
 959 #ifndef OPENSSL_NO_TLSEXT
 960         /* TLS extensions*/
 961         if (s->version >= SSL3_VERSION)
 962                 {
 963                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 964                         {
 965                         /* 'al' set by ssl_parse_serverhello_tlsext */
 966                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 967                         goto f_err;
 968                         }
 969                 if (ssl_check_serverhello_tlsext(s) <= 0)
 970                         {
 971                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 972                                 goto err;
 973                         }
 974                 }
 975 #endif
 976
 977         if (p != (d+n))
 978                 {
 979                 /* wrong packet length */
 980                 al=SSL_AD_DECODE_ERROR;
 981                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 982                 goto err;
 983                 }
 984
 985         return(1);
 986 f_err:
 987         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 988 err:
 989         return(-1);
 990         }
 991
 992 int ssl3_get_server_certificate(SSL *s)
 993         {
 994         int al,i,ok,ret= -1;
 995         unsigned long n,nc,llen,l;
 996         X509 *x=NULL;
 997         const unsigned char *q,*p;
 998         unsigned char *d;
 999         STACK_OF(X509) *sk=NULL;
1000         SESS_CERT *sc;
1001         EVP_PKEY *pkey=NULL;
1002         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1003
1004         n=s->method->ssl_get_message(s,
1005                 SSL3_ST_CR_CERT_A,
1006                 SSL3_ST_CR_CERT_B,
1007                 -1,
1008                 s->max_cert_list,
1009                 &ok);
1010
1011         if (!ok) return((int)n);
1012
1013         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1014                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1015                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1016                 {
1017                 s->s3->tmp.reuse_message=1;
1018                 return(1);
1019                 }
1020
1021         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1022                 {
1023                 al=SSL_AD_UNEXPECTED_MESSAGE;
1024                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1025                 goto f_err;
1026                 }
1027         p=d=(unsigned char *)s->init_msg;
1028
1029         if ((sk=sk_X509_new_null()) == NULL)
1030                 {
1031                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1032                 goto err;
1033                 }
1034
1035         n2l3(p,llen);
1036         if (llen+3 != n)
1037                 {
1038                 al=SSL_AD_DECODE_ERROR;
1039                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1040                 goto f_err;
1041                 }
1042         for (nc=0; nc<llen; )
1043                 {
1044                 n2l3(p,l);
1045                 if ((l+nc+3) > llen)
1046                         {
1047                         al=SSL_AD_DECODE_ERROR;
1048                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1049                         goto f_err;
1050                         }
1051
1052                 q=p;
1053                 x=d2i_X509(NULL,&q,l);
1054                 if (x == NULL)
1055                         {
1056                         al=SSL_AD_BAD_CERTIFICATE;
1057                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1058                         goto f_err;
1059                         }
1060                 if (q != (p+l))
1061                         {
1062                         al=SSL_AD_DECODE_ERROR;
1063                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1064                         goto f_err;
1065                         }
1066                 if (!sk_X509_push(sk,x))
1067                         {
1068                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1069                         goto err;
1070                         }
1071                 x=NULL;
1072                 nc+=l+3;
1073                 p=q;
1074                 }
1075
1076         i=ssl_verify_cert_chain(s,sk);
1077         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1078 #ifndef OPENSSL_NO_KRB5
1079             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1080                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1081 #endif /* OPENSSL_NO_KRB5 */
1082                 )
1083                 {
1084                 al=ssl_verify_alarm_type(s->verify_result);
1085                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1086                 goto f_err;
1087                 }
1088         ERR_clear_error(); /* but we keep s->verify_result */
1089
1090         sc=ssl_sess_cert_new();
1091         if (sc == NULL) goto err;
1092
1093         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1094         s->session->sess_cert=sc;
1095
1096         sc->cert_chain=sk;
1097         /* Inconsistency alert: cert_chain does include the peer's
1098          * certificate, which we don't include in s3_srvr.c */
1099         x=sk_X509_value(sk,0);
1100         sk=NULL;
1101         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1102
1103         pkey=X509_get_pubkey(x);
1104
1105         /* VRS: allow null cert if auth == KRB5 */
1106         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1107                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1108                     ? 0 : 1;
1109
1110 #ifdef KSSL_DEBUG
1111         printf("pkey,x = %p, %p\n", pkey,x);
1112         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1113         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1114                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1115 #endif    /* KSSL_DEBUG */
1116
1117         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1118                 {
1119                 x=NULL;
1120                 al=SSL3_AL_FATAL;
1121                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1122                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1123                 goto f_err;
1124                 }
1125
1126         i=ssl_cert_type(x,pkey);
1127         if (need_cert && i < 0)
1128                 {
1129                 x=NULL;
1130                 al=SSL3_AL_FATAL;
1131                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1132                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1133                 goto f_err;
1134                 }
1135
1136         if (need_cert)
1137                 {
1138                 sc->peer_cert_type=i;
1139                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1140                 /* Why would the following ever happen?
1141                  * We just created sc a couple of lines ago. */
1142                 if (sc->peer_pkeys[i].x509 != NULL)
1143                         X509_free(sc->peer_pkeys[i].x509);
1144                 sc->peer_pkeys[i].x509=x;
1145                 sc->peer_key= &(sc->peer_pkeys[i]);
1146
1147                 if (s->session->peer != NULL)
1148                         X509_free(s->session->peer);
1149                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1150                 s->session->peer=x;
1151                 }
1152         else
1153                 {
1154                 sc->peer_cert_type=i;
1155                 sc->peer_key= NULL;
1156
1157                 if (s->session->peer != NULL)
1158                         X509_free(s->session->peer);
1159                 s->session->peer=NULL;
1160                 }
1161         s->session->verify_result = s->verify_result;
1162
1163         x=NULL;
1164         ret=1;
1165
1166         if (0)
1167                 {
1168 f_err:
1169                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1170                 }
1171 err:
1172         EVP_PKEY_free(pkey);
1173         X509_free(x);
1174         sk_X509_pop_free(sk,X509_free);
1175         return(ret);
1176         }
1177
1178 int ssl3_get_key_exchange(SSL *s)
1179         {
1180 #ifndef OPENSSL_NO_RSA
1181         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1182 #endif
1183         EVP_MD_CTX md_ctx;
1184         unsigned char *param,*p;
1185         int al,i,j,param_len,ok;
1186         long n,alg_k,alg_a;
1187         EVP_PKEY *pkey=NULL;
1188 #ifndef OPENSSL_NO_RSA
1189         RSA *rsa=NULL;
1190 #endif
1191 #ifndef OPENSSL_NO_DH
1192         DH *dh=NULL;
1193 #endif
1194 #ifndef OPENSSL_NO_ECDH
1195         EC_KEY *ecdh = NULL;
1196         BN_CTX *bn_ctx = NULL;
1197         EC_POINT *srvr_ecpoint = NULL;
1198         int curve_nid = 0;
1199         int encoded_pt_len = 0;
1200 #endif
1201
1202         /* use same message size as in ssl3_get_certificate_request()
1203          * as ServerKeyExchange message may be skipped */
1204         n=s->method->ssl_get_message(s,
1205                 SSL3_ST_CR_KEY_EXCH_A,
1206                 SSL3_ST_CR_KEY_EXCH_B,
1207                 -1,
1208                 s->max_cert_list,
1209                 &ok);
1210         if (!ok) return((int)n);
1211
1212         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1213                 {
1214 #ifndef OPENSSL_NO_PSK
1215                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1216                    omitted if no identity hint is sent. Set
1217                    session->sess_cert anyway to avoid problems
1218                    later.*/
1219                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1220                         {
1221                         s->session->sess_cert=ssl_sess_cert_new();
1222                         if (s->ctx->psk_identity_hint)
1223                                 OPENSSL_free(s->ctx->psk_identity_hint);
1224                         s->ctx->psk_identity_hint = NULL;
1225                         }
1226 #endif
1227                 s->s3->tmp.reuse_message=1;
1228                 return(1);
1229                 }
1230
1231         param=p=(unsigned char *)s->init_msg;
1232         if (s->session->sess_cert != NULL)
1233                 {
1234 #ifndef OPENSSL_NO_RSA
1235                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1236                         {
1237                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1238                         s->session->sess_cert->peer_rsa_tmp=NULL;
1239                         }
1240 #endif
1241 #ifndef OPENSSL_NO_DH
1242                 if (s->session->sess_cert->peer_dh_tmp)
1243                         {
1244                         DH_free(s->session->sess_cert->peer_dh_tmp);
1245                         s->session->sess_cert->peer_dh_tmp=NULL;
1246                         }
1247 #endif
1248 #ifndef OPENSSL_NO_ECDH
1249                 if (s->session->sess_cert->peer_ecdh_tmp)
1250                         {
1251                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1252                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1253                         }
1254 #endif
1255                 }
1256         else
1257                 {
1258                 s->session->sess_cert=ssl_sess_cert_new();
1259                 }
1260
1261         param_len=0;
1262         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1263         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1264         EVP_MD_CTX_init(&md_ctx);
1265
1266 #ifndef OPENSSL_NO_PSK
1267         if (alg_k & SSL_kPSK)
1268                 {
1269                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1270
1271                 al=SSL_AD_HANDSHAKE_FAILURE;
1272                 n2s(p,i);
1273                 param_len=i+2;
1274                 /* Store PSK identity hint for later use, hint is used
1275                  * in ssl3_send_client_key_exchange.  Assume that the
1276                  * maximum length of a PSK identity hint can be as
1277                  * long as the maximum length of a PSK identity. */
1278                 if (i > PSK_MAX_IDENTITY_LEN)
1279                         {
1280                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1281                                 SSL_R_DATA_LENGTH_TOO_LONG);
1282                         goto f_err;
1283                         }
1284                 if (param_len > n)
1285                         {
1286                         al=SSL_AD_DECODE_ERROR;
1287                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1288                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1289                         goto f_err;
1290                         }
1291                 /* If received PSK identity hint contains NULL
1292                  * characters, the hint is truncated from the first
1293                  * NULL. p may not be ending with NULL, so create a
1294                  * NULL-terminated string. */
1295                 memcpy(tmp_id_hint, p, i);
1296                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1297                 if (s->ctx->psk_identity_hint != NULL)
1298                         OPENSSL_free(s->ctx->psk_identity_hint);
1299                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1300                 if (s->ctx->psk_identity_hint == NULL)
1301                         {
1302                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1303                         goto f_err;
1304                         }
1305
1306                 p+=i;
1307                 n-=param_len;
1308                 }
1309         else
1310 #endif /* !OPENSSL_NO_PSK */
1311 #ifndef OPENSSL_NO_SRP
1312         if (alg_k & SSL_kSRP)
1313                 {
1314                 n2s(p,i);
1315                 param_len=i+2;
1316                 if (param_len > n)
1317                         {
1318                         al=SSL_AD_DECODE_ERROR;
1319                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1320                         goto f_err;
1321                         }
1322                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1323                         {
1324                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1325                         goto err;
1326                         }
1327                 p+=i;
1328
1329                 n2s(p,i);
1330                 param_len+=i+2;
1331                 if (param_len > n)
1332                         {
1333                         al=SSL_AD_DECODE_ERROR;
1334                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1335                         goto f_err;
1336                         }
1337                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1338                         {
1339                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1340                         goto err;
1341                         }
1342                 p+=i;
1343
1344                 i = (unsigned int)(p[0]);
1345                 p++;
1346                 param_len+=i+1;
1347                 if (param_len > n)
1348                         {
1349                         al=SSL_AD_DECODE_ERROR;
1350                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1351                         goto f_err;
1352                         }
1353                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1354                         {
1355                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1356                         goto err;
1357                         }
1358                 p+=i;
1359
1360                 n2s(p,i);
1361                 param_len+=i+2;
1362                 if (param_len > n)
1363                         {
1364                         al=SSL_AD_DECODE_ERROR;
1365                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1366                         goto f_err;
1367                         }
1368                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1369                         {
1370                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1371                         goto err;
1372                         }
1373                 p+=i;
1374                 n-=param_len;
1375
1376 /* We must check if there is a certificate */
1377 #ifndef OPENSSL_NO_RSA
1378                 if (alg_a & SSL_aRSA)
1379                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1380 #else
1381                 if (0)
1382                         ;
1383 #endif
1384 #ifndef OPENSSL_NO_DSA
1385                 else if (alg_a & SSL_aDSS)
1386                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1387 #endif
1388                 }
1389         else
1390 #endif /* !OPENSSL_NO_SRP */
1391 #ifndef OPENSSL_NO_RSA
1392         if (alg_k & SSL_kRSA)
1393                 {
1394                 if ((rsa=RSA_new()) == NULL)
1395                         {
1396                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1397                         goto err;
1398                         }
1399                 n2s(p,i);
1400                 param_len=i+2;
1401                 if (param_len > n)
1402                         {
1403                         al=SSL_AD_DECODE_ERROR;
1404                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1405                         goto f_err;
1406                         }
1407                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1408                         {
1409                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1410                         goto err;
1411                         }
1412                 p+=i;
1413
1414                 n2s(p,i);
1415                 param_len+=i+2;
1416                 if (param_len > n)
1417                         {
1418                         al=SSL_AD_DECODE_ERROR;
1419                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1420                         goto f_err;
1421                         }
1422                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1423                         {
1424                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1425                         goto err;
1426                         }
1427                 p+=i;
1428                 n-=param_len;
1429
1430                 /* this should be because we are using an export cipher */
1431                 if (alg_a & SSL_aRSA)
1432                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1433                 else
1434                         {
1435                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1436                         goto err;
1437                         }
1438                 s->session->sess_cert->peer_rsa_tmp=rsa;
1439                 rsa=NULL;
1440                 }
1441 #else /* OPENSSL_NO_RSA */
1442         if (0)
1443                 ;
1444 #endif
1445 #ifndef OPENSSL_NO_DH
1446         else if (alg_k & SSL_kEDH)
1447                 {
1448                 if ((dh=DH_new()) == NULL)
1449                         {
1450                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1451                         goto err;
1452                         }
1453                 n2s(p,i);
1454                 param_len=i+2;
1455                 if (param_len > n)
1456                         {
1457                         al=SSL_AD_DECODE_ERROR;
1458                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1459                         goto f_err;
1460                         }
1461                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1462                         {
1463                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1464                         goto err;
1465                         }
1466                 p+=i;
1467
1468                 n2s(p,i);
1469                 param_len+=i+2;
1470                 if (param_len > n)
1471                         {
1472                         al=SSL_AD_DECODE_ERROR;
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1474                         goto f_err;
1475                         }
1476                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1477                         {
1478                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1479                         goto err;
1480                         }
1481                 p+=i;
1482
1483                 n2s(p,i);
1484                 param_len+=i+2;
1485                 if (param_len > n)
1486                         {
1487                         al=SSL_AD_DECODE_ERROR;
1488                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1489                         goto f_err;
1490                         }
1491                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1492                         {
1493                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1494                         goto err;
1495                         }
1496                 p+=i;
1497                 n-=param_len;
1498
1499 #ifndef OPENSSL_NO_RSA
1500                 if (alg_a & SSL_aRSA)
1501                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1502 #else
1503                 if (0)
1504                         ;
1505 #endif
1506 #ifndef OPENSSL_NO_DSA
1507                 else if (alg_a & SSL_aDSS)
1508                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1509 #endif
1510                 /* else anonymous DH, so no certificate or pkey. */
1511
1512                 s->session->sess_cert->peer_dh_tmp=dh;
1513                 dh=NULL;
1514                 }
1515         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1516                 {
1517                 al=SSL_AD_ILLEGAL_PARAMETER;
1518                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1519                 goto f_err;
1520                 }
1521 #endif /* !OPENSSL_NO_DH */
1522
1523 #ifndef OPENSSL_NO_ECDH
1524         else if (alg_k & SSL_kEECDH)
1525                 {
1526                 EC_GROUP *ngroup;
1527                 const EC_GROUP *group;
1528
1529                 if ((ecdh=EC_KEY_new()) == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1532                         goto err;
1533                         }
1534
1535                 /* Extract elliptic curve parameters and the
1536                  * server's ephemeral ECDH public key.
1537                  * Keep accumulating lengths of various components in
1538                  * param_len and make sure it never exceeds n.
1539                  */
1540
1541                 /* XXX: For now we only support named (not generic) curves
1542                  * and the ECParameters in this case is just three bytes.
1543                  */
1544                 param_len=3;
1545                 if ((param_len > n) ||
1546                     (*p != NAMED_CURVE_TYPE) ||
1547                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1548                         {
1549                         al=SSL_AD_INTERNAL_ERROR;
1550                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1551                         goto f_err;
1552                         }
1553
1554                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1555                 if (ngroup == NULL)
1556                         {
1557                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1558                         goto err;
1559                         }
1560                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1561                         {
1562                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1563                         goto err;
1564                         }
1565                 EC_GROUP_free(ngroup);
1566
1567                 group = EC_KEY_get0_group(ecdh);
1568
1569                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1570                     (EC_GROUP_get_degree(group) > 163))
1571                         {
1572                         al=SSL_AD_EXPORT_RESTRICTION;
1573                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1574                         goto f_err;
1575                         }
1576
1577                 p+=3;
1578
1579                 /* Next, get the encoded ECPoint */
1580                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1581                     ((bn_ctx = BN_CTX_new()) == NULL))
1582                         {
1583                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1584                         goto err;
1585                         }
1586
1587                 encoded_pt_len = *p;  /* length of encoded point */
1588                 p+=1;
1589                 param_len += (1 + encoded_pt_len);
1590                 if ((param_len > n) ||
1591                     (EC_POINT_oct2point(group, srvr_ecpoint,
1592                         p, encoded_pt_len, bn_ctx) == 0))
1593                         {
1594                         al=SSL_AD_DECODE_ERROR;
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1596                         goto f_err;
1597                         }
1598
1599                 n-=param_len;
1600                 p+=encoded_pt_len;
1601
1602                 /* The ECC/TLS specification does not mention
1603                  * the use of DSA to sign ECParameters in the server
1604                  * key exchange message. We do support RSA and ECDSA.
1605                  */
1606                 if (0) ;
1607 #ifndef OPENSSL_NO_RSA
1608                 else if (alg_a & SSL_aRSA)
1609                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1610 #endif
1611 #ifndef OPENSSL_NO_ECDSA
1612                 else if (alg_a & SSL_aECDSA)
1613                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1614 #endif
1615                 /* else anonymous ECDH, so no certificate or pkey. */
1616                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1617                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1618                 ecdh=NULL;
1619                 BN_CTX_free(bn_ctx);
1620                 bn_ctx = NULL;
1621                 EC_POINT_free(srvr_ecpoint);
1622                 srvr_ecpoint = NULL;
1623                 }
1624         else if (alg_k)
1625                 {
1626                 al=SSL_AD_UNEXPECTED_MESSAGE;
1627                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1628                 goto f_err;
1629                 }
1630 #endif /* !OPENSSL_NO_ECDH */
1631
1632
1633         /* p points to the next byte, there are 'n' bytes left */
1634
1635         /* if it was signed, check the signature */
1636         if (pkey != NULL)
1637                 {
1638                 n2s(p,i);
1639                 n-=2;
1640                 j=EVP_PKEY_size(pkey);
1641
1642                 if ((i != n) || (n > j) || (n <= 0))
1643                         {
1644                         /* wrong packet length */
1645                         al=SSL_AD_DECODE_ERROR;
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1647                         goto f_err;
1648                         }
1649
1650 #ifndef OPENSSL_NO_RSA
1651                 if (pkey->type == EVP_PKEY_RSA)
1652                         {
1653                         int num;
1654
1655                         j=0;
1656                         q=md_buf;
1657                         for (num=2; num > 0; num--)
1658                                 {
1659                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1660                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1661                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1662                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1663                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1664                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1665                                 q+=i;
1666                                 j+=i;
1667                                 }
1668                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1669                                                                 pkey->pkey.rsa);
1670                         if (i < 0)
1671                                 {
1672                                 al=SSL_AD_DECRYPT_ERROR;
1673                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1674                                 goto f_err;
1675                                 }
1676                         if (i == 0)
1677                                 {
1678                                 /* bad signature */
1679                                 al=SSL_AD_DECRYPT_ERROR;
1680                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1681                                 goto f_err;
1682                                 }
1683                         }
1684                 else
1685 #endif
1686 #ifndef OPENSSL_NO_DSA
1687                         if (pkey->type == EVP_PKEY_DSA)
1688                         {
1689                         /* lets do DSS */
1690                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1691                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1692                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1693                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1694                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1695                                 {
1696                                 /* bad signature */
1697                                 al=SSL_AD_DECRYPT_ERROR;
1698                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1699                                 goto f_err;
1700                                 }
1701                         }
1702                 else
1703 #endif
1704 #ifndef OPENSSL_NO_ECDSA
1705                         if (pkey->type == EVP_PKEY_EC)
1706                         {
1707                         /* let's do ECDSA */
1708                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1709                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1710                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1711                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1712                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1713                                 {
1714                                 /* bad signature */
1715                                 al=SSL_AD_DECRYPT_ERROR;
1716                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1717                                 goto f_err;
1718                                 }
1719                         }
1720                 else
1721 #endif
1722                         {
1723                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1724                         goto err;
1725                         }
1726                 }
1727         else
1728                 {
1729                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1730                         /* aNULL or kPSK do not need public keys */
1731                         {
1732                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1733                         goto err;
1734                         }
1735                 /* still data left over */
1736                 if (n != 0)
1737                         {
1738                         al=SSL_AD_DECODE_ERROR;
1739                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1740                         goto f_err;
1741                         }
1742                 }
1743         EVP_PKEY_free(pkey);
1744         EVP_MD_CTX_cleanup(&md_ctx);
1745         return(1);
1746 f_err:
1747         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1748 err:
1749         EVP_PKEY_free(pkey);
1750 #ifndef OPENSSL_NO_RSA
1751         if (rsa != NULL)
1752                 RSA_free(rsa);
1753 #endif
1754 #ifndef OPENSSL_NO_DH
1755         if (dh != NULL)
1756                 DH_free(dh);
1757 #endif
1758 #ifndef OPENSSL_NO_ECDH
1759         BN_CTX_free(bn_ctx);
1760         EC_POINT_free(srvr_ecpoint);
1761         if (ecdh != NULL)
1762                 EC_KEY_free(ecdh);
1763 #endif
1764         EVP_MD_CTX_cleanup(&md_ctx);
1765         return(-1);
1766         }
1767
1768 int ssl3_get_certificate_request(SSL *s)
1769         {
1770         int ok,ret=0;
1771         unsigned long n,nc,l;
1772         unsigned int llen,ctype_num,i;
1773         X509_NAME *xn=NULL;
1774         const unsigned char *p,*q;
1775         unsigned char *d;
1776         STACK_OF(X509_NAME) *ca_sk=NULL;
1777
1778         n=s->method->ssl_get_message(s,
1779                 SSL3_ST_CR_CERT_REQ_A,
1780                 SSL3_ST_CR_CERT_REQ_B,
1781                 -1,
1782                 s->max_cert_list,
1783                 &ok);
1784
1785         if (!ok) return((int)n);
1786
1787         s->s3->tmp.cert_req=0;
1788
1789         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1790                 {
1791                 s->s3->tmp.reuse_message=1;
1792                 return(1);
1793                 }
1794
1795         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1796                 {
1797                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1798                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1799                 goto err;
1800                 }
1801
1802         /* TLS does not like anon-DH with client cert */
1803         if (s->version > SSL3_VERSION)
1804                 {
1805                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1806                         {
1807                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1808                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1809                         goto err;
1810                         }
1811                 }
1812
1813         p=d=(unsigned char *)s->init_msg;
1814
1815         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1816                 {
1817                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1818                 goto err;
1819                 }
1820
1821         /* get the certificate types */
1822         ctype_num= *(p++);
1823         if (ctype_num > SSL3_CT_NUMBER)
1824                 ctype_num=SSL3_CT_NUMBER;
1825         for (i=0; i<ctype_num; i++)
1826                 s->s3->tmp.ctype[i]= p[i];
1827         p+=ctype_num;
1828
1829         /* get the CA RDNs */
1830         n2s(p,llen);
1831 #if 0
1832 {
1833 FILE *out;
1834 out=fopen("/tmp/vsign.der","w");
1835 fwrite(p,1,llen,out);
1836 fclose(out);
1837 }
1838 #endif
1839
1840         if ((llen+ctype_num+2+1) != n)
1841                 {
1842                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1843                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1844                 goto err;
1845                 }
1846
1847         for (nc=0; nc<llen; )
1848                 {
1849                 n2s(p,l);
1850                 if ((l+nc+2) > llen)
1851                         {
1852                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1853                                 goto cont; /* netscape bugs */
1854                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1855                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1856                         goto err;
1857                         }
1858
1859                 q=p;
1860
1861                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1862                         {
1863                         /* If netscape tolerance is on, ignore errors */
1864                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1865                                 goto cont;
1866                         else
1867                                 {
1868                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1869                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1870                                 goto err;
1871                                 }
1872                         }
1873
1874                 if (q != (p+l))
1875                         {
1876                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1877                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1878                         goto err;
1879                         }
1880                 if (!sk_X509_NAME_push(ca_sk,xn))
1881                         {
1882                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1883                         goto err;
1884                         }
1885
1886                 p+=l;
1887                 nc+=l+2;
1888                 }
1889
1890         if (0)
1891                 {
1892 cont:
1893                 ERR_clear_error();
1894                 }
1895
1896         /* we should setup a certificate to return.... */
1897         s->s3->tmp.cert_req=1;
1898         s->s3->tmp.ctype_num=ctype_num;
1899         if (s->s3->tmp.ca_names != NULL)
1900                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1901         s->s3->tmp.ca_names=ca_sk;
1902         ca_sk=NULL;
1903
1904         ret=1;
1905 err:
1906         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1907         return(ret);
1908         }
1909
1910 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1911         {
1912         return(X509_NAME_cmp(*a,*b));
1913         }
1914 #ifndef OPENSSL_NO_TLSEXT
1915 int ssl3_get_new_session_ticket(SSL *s)
1916         {
1917         int ok,al,ret=0, ticklen;
1918         long n;
1919         const unsigned char *p;
1920         unsigned char *d;
1921
1922         n=s->method->ssl_get_message(s,
1923                 SSL3_ST_CR_SESSION_TICKET_A,
1924                 SSL3_ST_CR_SESSION_TICKET_B,
1925                 -1,
1926                 16384,
1927                 &ok);
1928
1929         if (!ok)
1930                 return((int)n);
1931
1932         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1933                 {
1934                 s->s3->tmp.reuse_message=1;
1935                 return(1);
1936                 }
1937         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1938                 {
1939                 al=SSL_AD_UNEXPECTED_MESSAGE;
1940                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1941                 goto f_err;
1942                 }
1943         if (n < 6)
1944                 {
1945                 /* need at least ticket_lifetime_hint + ticket length */
1946                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1947                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1948                 goto f_err;
1949                 }
1950
1951         p=d=(unsigned char *)s->init_msg;
1952         n2l(p, s->session->tlsext_tick_lifetime_hint);
1953         n2s(p, ticklen);
1954         /* ticket_lifetime_hint + ticket_length + ticket */
1955         if (ticklen + 6 != n)
1956                 {
1957                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1958                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1959                 goto f_err;
1960                 }
1961         if (s->session->tlsext_tick)
1962                 {
1963                 OPENSSL_free(s->session->tlsext_tick);
1964                 s->session->tlsext_ticklen = 0;
1965                 }
1966         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1967         if (!s->session->tlsext_tick)
1968                 {
1969                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1970                 goto err;
1971                 }
1972         memcpy(s->session->tlsext_tick, p, ticklen);
1973         s->session->tlsext_ticklen = ticklen;
1974         /* There are two ways to detect a resumed ticket sesion.
1975          * One is to set an appropriate session ID and then the server
1976          * must return a match in ServerHello. This allows the normal
1977          * client session ID matching to work and we know much
1978          * earlier that the ticket has been accepted.
1979          *
1980          * The other way is to set zero length session ID when the
1981          * ticket is presented and rely on the handshake to determine
1982          * session resumption.
1983          *
1984          * We choose the former approach because this fits in with
1985          * assumptions elsewhere in OpenSSL. The session ID is set
1986          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1987          * ticket.
1988          */
1989         EVP_Digest(p, ticklen,
1990                         s->session->session_id, &s->session->session_id_length,
1991 #ifndef OPENSSL_NO_SHA256
1992                                                         EVP_sha256(), NULL);
1993 #else
1994                                                         EVP_sha1(), NULL);
1995 #endif
1996         ret=1;
1997         return(ret);
1998 f_err:
1999         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2000 err:
2001         return(-1);
2002         }
2003
2004 int ssl3_get_cert_status(SSL *s)
2005         {
2006         int ok, al;
2007         unsigned long resplen,n;
2008         const unsigned char *p;
2009
2010         n=s->method->ssl_get_message(s,
2011                 SSL3_ST_CR_CERT_STATUS_A,
2012                 SSL3_ST_CR_CERT_STATUS_B,
2013                 SSL3_MT_CERTIFICATE_STATUS,
2014                 16384,
2015                 &ok);
2016
2017         if (!ok) return((int)n);
2018         if (n < 4)
2019                 {
2020                 /* need at least status type + length */
2021                 al = SSL_AD_DECODE_ERROR;
2022                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2023                 goto f_err;
2024                 }
2025         p = (unsigned char *)s->init_msg;
2026         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2027                 {
2028                 al = SSL_AD_DECODE_ERROR;
2029                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2030                 goto f_err;
2031                 }
2032         n2l3(p, resplen);
2033         if (resplen + 4 != n)
2034                 {
2035                 al = SSL_AD_DECODE_ERROR;
2036                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2037                 goto f_err;
2038                 }
2039         if (s->tlsext_ocsp_resp)
2040                 OPENSSL_free(s->tlsext_ocsp_resp);
2041         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2042         if (!s->tlsext_ocsp_resp)
2043                 {
2044                 al = SSL_AD_INTERNAL_ERROR;
2045                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2046                 goto f_err;
2047                 }
2048         s->tlsext_ocsp_resplen = resplen;
2049         if (s->ctx->tlsext_status_cb)
2050                 {
2051                 int ret;
2052                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2053                 if (ret == 0)
2054                         {
2055                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2056                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2057                         goto f_err;
2058                         }
2059                 if (ret < 0)
2060                         {
2061                         al = SSL_AD_INTERNAL_ERROR;
2062                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2063                         goto f_err;
2064                         }
2065                 }
2066         return 1;
2067 f_err:
2068         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2069         return(-1);
2070         }
2071 #endif
2072
2073 int ssl3_get_server_done(SSL *s)
2074         {
2075         int ok,ret=0;
2076         long n;
2077
2078         n=s->method->ssl_get_message(s,
2079                 SSL3_ST_CR_SRVR_DONE_A,
2080                 SSL3_ST_CR_SRVR_DONE_B,
2081                 SSL3_MT_SERVER_DONE,
2082                 30, /* should be very small, like 0 :-) */
2083                 &ok);
2084
2085         if (!ok) return((int)n);
2086         if (n > 0)
2087                 {
2088                 /* should contain no data */
2089                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2090                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2091                 return -1;
2092                 }
2093         ret=1;
2094         return(ret);
2095         }
2096
2097
2098 int ssl3_send_client_key_exchange(SSL *s)
2099         {
2100         unsigned char *p,*d;
2101         int n;
2102         unsigned long alg_k;
2103 #ifndef OPENSSL_NO_RSA
2104         unsigned char *q;
2105         EVP_PKEY *pkey=NULL;
2106 #endif
2107 #ifndef OPENSSL_NO_KRB5
2108         KSSL_ERR kssl_err;
2109 #endif /* OPENSSL_NO_KRB5 */
2110 #ifndef OPENSSL_NO_ECDH
2111         EC_KEY *clnt_ecdh = NULL;
2112         const EC_POINT *srvr_ecpoint = NULL;
2113         EVP_PKEY *srvr_pub_pkey = NULL;
2114         unsigned char *encodedPoint = NULL;
2115         int encoded_pt_len = 0;
2116         BN_CTX * bn_ctx = NULL;
2117 #endif
2118
2119         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2120                 {
2121                 d=(unsigned char *)s->init_buf->data;
2122                 p= &(d[4]);
2123
2124                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2125
2126                 /* Fool emacs indentation */
2127                 if (0) {}
2128 #ifndef OPENSSL_NO_RSA
2129                 else if (alg_k & SSL_kRSA)
2130                         {
2131                         RSA *rsa;
2132                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2133
2134                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2135                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2136                         else
2137                                 {
2138                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2139                                 if ((pkey == NULL) ||
2140                                         (pkey->type != EVP_PKEY_RSA) ||
2141                                         (pkey->pkey.rsa == NULL))
2142                                         {
2143                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2144                                         goto err;
2145                                         }
2146                                 rsa=pkey->pkey.rsa;
2147                                 EVP_PKEY_free(pkey);
2148                                 }
2149
2150                         tmp_buf[0]=s->client_version>>8;
2151                         tmp_buf[1]=s->client_version&0xff;
2152                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2153                                         goto err;
2154
2155                         s->session->master_key_length=sizeof tmp_buf;
2156
2157                         q=p;
2158                         /* Fix buf for TLS and beyond */
2159                         if (s->version > SSL3_VERSION)
2160                                 p+=2;
2161                         n=RSA_public_encrypt(sizeof tmp_buf,
2162                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2163 #ifdef PKCS1_CHECK
2164                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2165                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2166 #endif
2167                         if (n <= 0)
2168                                 {
2169                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2170                                 goto err;
2171                                 }
2172
2173                         /* Fix buf for TLS and beyond */
2174                         if (s->version > SSL3_VERSION)
2175                                 {
2176                                 s2n(n,q);
2177                                 n+=2;
2178                                 }
2179
2180                         s->session->master_key_length=
2181                                 s->method->ssl3_enc->generate_master_secret(s,
2182                                         s->session->master_key,
2183                                         tmp_buf,sizeof tmp_buf);
2184                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2185                         }
2186 #endif
2187 #ifndef OPENSSL_NO_KRB5
2188                 else if (alg_k & SSL_kKRB5)
2189                         {
2190                         krb5_error_code krb5rc;
2191                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2192                         /*  krb5_data   krb5_ap_req;  */
2193                         krb5_data       *enc_ticket;
2194                         krb5_data       authenticator, *authp = NULL;
2195                         EVP_CIPHER_CTX  ciph_ctx;
2196                         const EVP_CIPHER *enc = NULL;
2197                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2198                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2199                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2200                                                 + EVP_MAX_IV_LENGTH];
2201                         int             padl, outl = sizeof(epms);
2202
2203                         EVP_CIPHER_CTX_init(&ciph_ctx);
2204
2205 #ifdef KSSL_DEBUG
2206                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2207                                 alg_k, SSL_kKRB5);
2208 #endif  /* KSSL_DEBUG */
2209
2210                         authp = NULL;
2211 #ifdef KRB5SENDAUTH
2212                         if (KRB5SENDAUTH)  authp = &authenticator;
2213 #endif  /* KRB5SENDAUTH */
2214
2215                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2216                                 &kssl_err);
2217                         enc = kssl_map_enc(kssl_ctx->enctype);
2218                         if (enc == NULL)
2219                             goto err;
2220 #ifdef KSSL_DEBUG
2221                         {
2222                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2223                         if (krb5rc && kssl_err.text)
2224                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2225                         }
2226 #endif  /* KSSL_DEBUG */
2227
2228                         if (krb5rc)
2229                                 {
2230                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2231                                                 SSL_AD_HANDSHAKE_FAILURE);
2232                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2233                                                 kssl_err.reason);
2234                                 goto err;
2235                                 }
2236
2237                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2238                         **  in place of RFC 2712 KerberosWrapper, as in:
2239                         **
2240                         **  Send ticket (copy to *p, set n = length)
2241                         **  n = krb5_ap_req.length;
2242                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2243                         **  if (krb5_ap_req.data)
2244                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2245                         **
2246                         **  Now using real RFC 2712 KerberosWrapper
2247                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2248                         **  Note: 2712 "opaque" types are here replaced
2249                         **  with a 2-byte length followed by the value.
2250                         **  Example:
2251                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2252                         **  Where "xx xx" = length bytes.  Shown here with
2253                         **  optional authenticator omitted.
2254                         */
2255
2256                         /*  KerberosWrapper.Ticket              */
2257                         s2n(enc_ticket->length,p);
2258                         memcpy(p, enc_ticket->data, enc_ticket->length);
2259                         p+= enc_ticket->length;
2260                         n = enc_ticket->length + 2;
2261
2262                         /*  KerberosWrapper.Authenticator       */
2263                         if (authp  &&  authp->length)
2264                                 {
2265                                 s2n(authp->length,p);
2266                                 memcpy(p, authp->data, authp->length);
2267                                 p+= authp->length;
2268                                 n+= authp->length + 2;
2269
2270                                 free(authp->data);
2271                                 authp->data = NULL;
2272                                 authp->length = 0;
2273                                 }
2274                         else
2275                                 {
2276                                 s2n(0,p);/*  null authenticator length  */
2277                                 n+=2;
2278                                 }
2279
2280                             tmp_buf[0]=s->client_version>>8;
2281                             tmp_buf[1]=s->client_version&0xff;
2282                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2283                                 goto err;
2284
2285                         /*  20010420 VRS.  Tried it this way; failed.
2286                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2287                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2288                         **                              kssl_ctx->length);
2289                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2290                         */
2291
2292                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2293                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2294                                 kssl_ctx->key,iv);
2295                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2296                                 sizeof tmp_buf);
2297                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2298                         outl += padl;
2299                         if (outl > (int)sizeof epms)
2300                                 {
2301                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2302                                 goto err;
2303                                 }
2304                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2305
2306                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2307                         s2n(outl,p);
2308                         memcpy(p, epms, outl);
2309                         p+=outl;
2310                         n+=outl + 2;
2311
2312                         s->session->master_key_length=
2313                                 s->method->ssl3_enc->generate_master_secret(s,
2314                                         s->session->master_key,
2315                                         tmp_buf, sizeof tmp_buf);
2316
2317                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2318                         OPENSSL_cleanse(epms, outl);
2319                         }
2320 #endif
2321 #ifndef OPENSSL_NO_DH
2322                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2323                         {
2324                         DH *dh_srvr,*dh_clnt;
2325
2326                         if (s->session->sess_cert == NULL)
2327                                 {
2328                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2329                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2330                                 goto err;
2331                                 }
2332
2333                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2334                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2335                         else
2336                                 {
2337                                 /* we get them from the cert */
2338                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2339                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2340                                 goto err;
2341                                 }
2342
2343                         /* generate a new random key */
2344                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2345                                 {
2346                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2347                                 goto err;
2348                                 }
2349                         if (!DH_generate_key(dh_clnt))
2350                                 {
2351                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2352                                 goto err;
2353                                 }
2354
2355                         /* use the 'p' output buffer for the DH key, but
2356                          * make sure to clear it out afterwards */
2357
2358                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2359
2360                         if (n <= 0)
2361                                 {
2362                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2363                                 goto err;
2364                                 }
2365
2366                         /* generate master key from the result */
2367                         s->session->master_key_length=
2368                                 s->method->ssl3_enc->generate_master_secret(s,
2369                                         s->session->master_key,p,n);
2370                         /* clean up */
2371                         memset(p,0,n);
2372
2373                         /* send off the data */
2374                         n=BN_num_bytes(dh_clnt->pub_key);
2375                         s2n(n,p);
2376                         BN_bn2bin(dh_clnt->pub_key,p);
2377                         n+=2;
2378
2379                         DH_free(dh_clnt);
2380
2381                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2382                         }
2383 #endif
2384
2385 #ifndef OPENSSL_NO_ECDH
2386                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2387                         {
2388                         const EC_GROUP *srvr_group = NULL;
2389                         EC_KEY *tkey;
2390                         int ecdh_clnt_cert = 0;
2391                         int field_size = 0;
2392
2393                         /* Did we send out the client's
2394                          * ECDH share for use in premaster
2395                          * computation as part of client certificate?
2396                          * If so, set ecdh_clnt_cert to 1.
2397                          */
2398                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2399                                 {
2400                                 /* XXX: For now, we do not support client
2401                                  * authentication using ECDH certificates.
2402                                  * To add such support, one needs to add
2403                                  * code that checks for appropriate
2404                                  * conditions and sets ecdh_clnt_cert to 1.
2405                                  * For example, the cert have an ECC
2406                                  * key on the same curve as the server's
2407                                  * and the key should be authorized for
2408                                  * key agreement.
2409                                  *
2410                                  * One also needs to add code in ssl3_connect
2411                                  * to skip sending the certificate verify
2412                                  * message.
2413                                  *
2414                                  * if ((s->cert->key->privatekey != NULL) &&
2415                                  *     (s->cert->key->privatekey->type ==
2416                                  *      EVP_PKEY_EC) && ...)
2417                                  * ecdh_clnt_cert = 1;
2418                                  */
2419                                 }
2420
2421                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2422                                 {
2423                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2424                                 }
2425                         else
2426                                 {
2427                                 /* Get the Server Public Key from Cert */
2428                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2429                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2430                                 if ((srvr_pub_pkey == NULL) ||
2431                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2432                                     (srvr_pub_pkey->pkey.ec == NULL))
2433                                         {
2434                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2435                                             ERR_R_INTERNAL_ERROR);
2436                                         goto err;
2437                                         }
2438
2439                                 tkey = srvr_pub_pkey->pkey.ec;
2440                                 }
2441
2442                         srvr_group   = EC_KEY_get0_group(tkey);
2443                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2444
2445                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2446                                 {
2447                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2448                                     ERR_R_INTERNAL_ERROR);
2449                                 goto err;
2450                                 }
2451
2452                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2453                                 {
2454                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2455                                 goto err;
2456                                 }
2457
2458                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2459                                 {
2460                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2461                                 goto err;
2462                                 }
2463                         if (ecdh_clnt_cert)
2464                                 {
2465                                 /* Reuse key info from our certificate
2466                                  * We only need our private key to perform
2467                                  * the ECDH computation.
2468                                  */
2469                                 const BIGNUM *priv_key;
2470                                 tkey = s->cert->key->privatekey->pkey.ec;
2471                                 priv_key = EC_KEY_get0_private_key(tkey);
2472                                 if (priv_key == NULL)
2473                                         {
2474                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2475                                         goto err;
2476                                         }
2477                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2478                                         {
2479                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2480                                         goto err;
2481                                         }
2482                                 }
2483                         else
2484                                 {
2485                                 /* Generate a new ECDH key pair */
2486                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2487                                         {
2488                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2489                                         goto err;
2490                                         }
2491                                 }
2492
2493                         /* use the 'p' output buffer for the ECDH key, but
2494                          * make sure to clear it out afterwards
2495                          */
2496
2497                         field_size = EC_GROUP_get_degree(srvr_group);
2498                         if (field_size <= 0)
2499                                 {
2500                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2501                                        ERR_R_ECDH_LIB);
2502                                 goto err;
2503                                 }
2504                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2505                         if (n <= 0)
2506                                 {
2507                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2508                                        ERR_R_ECDH_LIB);
2509                                 goto err;
2510                                 }
2511
2512                         /* generate master key from the result */
2513                         s->session->master_key_length = s->method->ssl3_enc \
2514                             -> generate_master_secret(s,
2515                                 s->session->master_key,
2516                                 p, n);
2517
2518                         memset(p, 0, n); /* clean up */
2519
2520                         if (ecdh_clnt_cert)
2521                                 {
2522                                 /* Send empty client key exch message */
2523                                 n = 0;
2524                                 }
2525                         else
2526                                 {
2527                                 /* First check the size of encoding and
2528                                  * allocate memory accordingly.
2529                                  */
2530                                 encoded_pt_len =
2531                                     EC_POINT_point2oct(srvr_group,
2532                                         EC_KEY_get0_public_key(clnt_ecdh),
2533                                         POINT_CONVERSION_UNCOMPRESSED,
2534                                         NULL, 0, NULL);
2535
2536                                 encodedPoint = (unsigned char *)
2537                                     OPENSSL_malloc(encoded_pt_len *
2538                                         sizeof(unsigned char));
2539                                 bn_ctx = BN_CTX_new();
2540                                 if ((encodedPoint == NULL) ||
2541                                     (bn_ctx == NULL))
2542                                         {
2543                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2544                                         goto err;
2545                                         }
2546
2547                                 /* Encode the public key */
2548                                 n = EC_POINT_point2oct(srvr_group,
2549                                     EC_KEY_get0_public_key(clnt_ecdh),
2550                                     POINT_CONVERSION_UNCOMPRESSED,
2551                                     encodedPoint, encoded_pt_len, bn_ctx);
2552
2553                                 *p = n; /* length of encoded point */
2554                                 /* Encoded point will be copied here */
2555                                 p += 1;
2556                                 /* copy the point */
2557                                 memcpy((unsigned char *)p, encodedPoint, n);
2558                                 /* increment n to account for length field */
2559                                 n += 1;
2560                                 }
2561
2562                         /* Free allocated memory */
2563                         BN_CTX_free(bn_ctx);
2564                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2565                         if (clnt_ecdh != NULL)
2566                                  EC_KEY_free(clnt_ecdh);
2567                         EVP_PKEY_free(srvr_pub_pkey);
2568                         }
2569 #endif /* !OPENSSL_NO_ECDH */
2570                 else if (alg_k & SSL_kGOST)
2571                         {
2572                         /* GOST key exchange message creation */
2573                         EVP_PKEY_CTX *pkey_ctx;
2574                         X509 *peer_cert;
2575                         size_t msglen;
2576                         unsigned int md_len;
2577                         int keytype;
2578                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2579                         EVP_MD_CTX *ukm_hash;
2580                         EVP_PKEY *pub_key;
2581
2582                         /* Get server sertificate PKEY and create ctx from it */
2583                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2584                         if (!peer_cert)
2585                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2586                         if (!peer_cert)         {
2587                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2588                                         goto err;
2589                                 }
2590
2591                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2592                         /* If we have send a certificate, and certificate key
2593
2594                          * parameters match those of server certificate, use
2595                          * certificate key for key exchange
2596                          */
2597
2598                          /* Otherwise, generate ephemeral key pair */
2599
2600                         EVP_PKEY_encrypt_init(pkey_ctx);
2601                           /* Generate session key */
2602                     RAND_bytes(premaster_secret,32);
2603                         /* If we have client certificate, use its secret as peer key */
2604                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2605                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2606                                         /* If there was an error - just ignore it. Ephemeral key
2607                                         * would be used
2608                                         */
2609                                         ERR_clear_error();
2610                                 }
2611                         }
2612                         /* Compute shared IV and store it in algorithm-specific
2613                          * context data */
2614                         ukm_hash = EVP_MD_CTX_create();
2615                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2616                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2617                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2618                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2619                         EVP_MD_CTX_destroy(ukm_hash);
2620                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2621                                 8,shared_ukm)<0) {
2622                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2623                                                 SSL_R_LIBRARY_BUG);
2624                                         goto err;
2625                                 }
2626                         /* Make GOST keytransport blob message */
2627                         /*Encapsulate it into sequence */
2628                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2629                         msglen=255;
2630                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2631                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2632                                         SSL_R_LIBRARY_BUG);
2633                                 goto err;
2634                         }
2635                         if (msglen >= 0x80)
2636                                 {
2637                                 *(p++)=0x81;
2638                                 *(p++)= msglen & 0xff;
2639                                 n=msglen+3;
2640                                 }
2641                         else
2642                                 {
2643                                 *(p++)= msglen & 0xff;
2644                                 n=msglen+2;
2645                                 }
2646                         memcpy(p, tmp, msglen);
2647                         /* Check if pubkey from client certificate was used */
2648                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2649                                 {
2650                                 /* Set flag "skip certificate verify" */
2651                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2652                                 }
2653                         EVP_PKEY_CTX_free(pkey_ctx);
2654                         s->session->master_key_length=
2655                                 s->method->ssl3_enc->generate_master_secret(s,
2656                                         s->session->master_key,premaster_secret,32);
2657                         EVP_PKEY_free(pub_key);
2658
2659                         }
2660 #ifndef OPENSSL_NO_SRP
2661                 else if (alg_k & SSL_kSRP)
2662                         {
2663                         if (s->srp_ctx.A != NULL)
2664                                 {
2665                                 /* send off the data */
2666                                 n=BN_num_bytes(s->srp_ctx.A);
2667                                 s2n(n,p);
2668                                 BN_bn2bin(s->srp_ctx.A,p);
2669                                 n+=2;
2670                                 }
2671                         else
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2674                                 goto err;
2675                                 }
2676                         if (s->session->srp_username != NULL)
2677                                 OPENSSL_free(s->session->srp_username);
2678                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2679                         if (s->session->srp_username == NULL)
2680                                 {
2681                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2682                                         ERR_R_MALLOC_FAILURE);
2683                                 goto err;
2684                                 }
2685
2686                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2689                                 goto err;
2690                                 }
2691                         }
2692 #endif
2693 #ifndef OPENSSL_NO_PSK
2694                 else if (alg_k & SSL_kPSK)
2695                         {
2696                         char identity[PSK_MAX_IDENTITY_LEN];
2697                         unsigned char *t = NULL;
2698                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2699                         unsigned int pre_ms_len = 0, psk_len = 0;
2700                         int psk_err = 1;
2701
2702                         n = 0;
2703                         if (s->psk_client_callback == NULL)
2704                                 {
2705                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2706                                         SSL_R_PSK_NO_CLIENT_CB);
2707                                 goto err;
2708                                 }
2709
2710                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2711                                 identity, PSK_MAX_IDENTITY_LEN,
2712                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2713                         if (psk_len > PSK_MAX_PSK_LEN)
2714                                 {
2715                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2716                                         ERR_R_INTERNAL_ERROR);
2717                                 goto psk_err;
2718                                 }
2719                         else if (psk_len == 0)
2720                                 {
2721                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2722                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2723                                 goto psk_err;
2724                                 }
2725
2726                         /* create PSK pre_master_secret */
2727                         pre_ms_len = 2+psk_len+2+psk_len;
2728                         t = psk_or_pre_ms;
2729                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2730                         s2n(psk_len, t);
2731                         memset(t, 0, psk_len);
2732                         t+=psk_len;
2733                         s2n(psk_len, t);
2734
2735                         if (s->session->psk_identity_hint != NULL)
2736                                 OPENSSL_free(s->session->psk_identity_hint);
2737                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2738                         if (s->ctx->psk_identity_hint != NULL &&
2739                                 s->session->psk_identity_hint == NULL)
2740                                 {
2741                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2742                                         ERR_R_MALLOC_FAILURE);
2743                                 goto psk_err;
2744                                 }
2745
2746                         if (s->session->psk_identity != NULL)
2747                                 OPENSSL_free(s->session->psk_identity);
2748                         s->session->psk_identity = BUF_strdup(identity);
2749                         if (s->session->psk_identity == NULL)
2750                                 {
2751                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2752                                         ERR_R_MALLOC_FAILURE);
2753                                 goto psk_err;
2754                                 }
2755
2756                         s->session->master_key_length =
2757                                 s->method->ssl3_enc->generate_master_secret(s,
2758                                         s->session->master_key,
2759                                         psk_or_pre_ms, pre_ms_len);
2760                         n = strlen(identity);
2761                         s2n(n, p);
2762                         memcpy(p, identity, n);
2763                         n+=2;
2764                         psk_err = 0;
2765                 psk_err:
2766                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2767                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2768                         if (psk_err != 0)
2769                                 {
2770                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2771                                 goto err;
2772                                 }
2773                         }
2774 #endif
2775                 else
2776                         {
2777                         ssl3_send_alert(s, SSL3_AL_FATAL,
2778                             SSL_AD_HANDSHAKE_FAILURE);
2779                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2780                             ERR_R_INTERNAL_ERROR);
2781                         goto err;
2782                         }
2783
2784                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2785                 l2n3(n,d);
2786
2787                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2788                 /* number of bytes to write */
2789                 s->init_num=n+4;
2790                 s->init_off=0;
2791                 }
2792
2793         /* SSL3_ST_CW_KEY_EXCH_B */
2794         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2795 err:
2796 #ifndef OPENSSL_NO_ECDH
2797         BN_CTX_free(bn_ctx);
2798         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2799         if (clnt_ecdh != NULL)
2800                 EC_KEY_free(clnt_ecdh);
2801         EVP_PKEY_free(srvr_pub_pkey);
2802 #endif
2803         return(-1);
2804         }
2805
2806 int ssl3_send_client_verify(SSL *s)
2807         {
2808         unsigned char *p,*d;
2809         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2810         EVP_PKEY *pkey;
2811         EVP_PKEY_CTX *pctx=NULL;
2812 #ifndef OPENSSL_NO_RSA
2813         unsigned u=0;
2814 #endif
2815         unsigned long n;
2816         int j;
2817
2818         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2819                 {
2820                 d=(unsigned char *)s->init_buf->data;
2821                 p= &(d[4]);
2822                 pkey=s->cert->key->privatekey;
2823 /* Create context from key and test if sha1 is allowed as digest */
2824                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2825                 EVP_PKEY_sign_init(pctx);
2826                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2827                         {
2828                         s->method->ssl3_enc->cert_verify_mac(s,
2829                                                 NID_sha1,
2830                                                 &(data[MD5_DIGEST_LENGTH]));
2831                         }
2832                 else
2833                         {
2834                         ERR_clear_error();
2835                         }
2836 #ifndef OPENSSL_NO_RSA
2837                 if (pkey->type == EVP_PKEY_RSA)
2838                         {
2839                         s->method->ssl3_enc->cert_verify_mac(s,
2840                                 NID_md5,
2841                                 &(data[0]));
2842                         if (RSA_sign(NID_md5_sha1, data,
2843                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2844                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2845                                 {
2846                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2847                                 goto err;
2848                                 }
2849                         s2n(u,p);
2850                         n=u+2;
2851                         }
2852                 else
2853 #endif
2854 #ifndef OPENSSL_NO_DSA
2855                         if (pkey->type == EVP_PKEY_DSA)
2856                         {
2857                         if (!DSA_sign(pkey->save_type,
2858                                 &(data[MD5_DIGEST_LENGTH]),
2859                                 SHA_DIGEST_LENGTH,&(p[2]),
2860                                 (unsigned int *)&j,pkey->pkey.dsa))
2861                                 {
2862                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2863                                 goto err;
2864                                 }
2865                         s2n(j,p);
2866                         n=j+2;
2867                         }
2868                 else
2869 #endif
2870 #ifndef OPENSSL_NO_ECDSA
2871                         if (pkey->type == EVP_PKEY_EC)
2872                         {
2873                         if (!ECDSA_sign(pkey->save_type,
2874                                 &(data[MD5_DIGEST_LENGTH]),
2875                                 SHA_DIGEST_LENGTH,&(p[2]),
2876                                 (unsigned int *)&j,pkey->pkey.ec))
2877                                 {
2878                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2879                                     ERR_R_ECDSA_LIB);
2880                                 goto err;
2881                                 }
2882                         s2n(j,p);
2883                         n=j+2;
2884                         }
2885                 else
2886 #endif
2887                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2888                 {
2889                 unsigned char signbuf[64];
2890                 int i;
2891                 size_t sigsize=64;
2892                 s->method->ssl3_enc->cert_verify_mac(s,
2893                         NID_id_GostR3411_94,
2894                         data);
2895                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2896                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2897                         ERR_R_INTERNAL_ERROR);
2898                         goto err;
2899                 }
2900                 for (i=63,j=0; i>=0; j++, i--) {
2901                         p[2+j]=signbuf[i];
2902                 }
2903                 s2n(j,p);
2904                 n=j+2;
2905                 }
2906                 else
2907                 {
2908                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2909                         goto err;
2910                 }
2911                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2912                 l2n3(n,d);
2913
2914                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2915                 s->init_num=(int)n+4;
2916                 s->init_off=0;
2917                 }
2918         EVP_PKEY_CTX_free(pctx);
2919         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2920 err:
2921         EVP_PKEY_CTX_free(pctx);
2922         return(-1);
2923         }
2924
2925 int ssl3_send_client_certificate(SSL *s)
2926         {
2927         X509 *x509=NULL;
2928         EVP_PKEY *pkey=NULL;
2929         int i;
2930         unsigned long l;
2931
2932         if (s->state == SSL3_ST_CW_CERT_A)
2933                 {
2934                 if ((s->cert == NULL) ||
2935                         (s->cert->key->x509 == NULL) ||
2936                         (s->cert->key->privatekey == NULL))
2937                         s->state=SSL3_ST_CW_CERT_B;
2938                 else
2939                         s->state=SSL3_ST_CW_CERT_C;
2940                 }
2941
2942         /* We need to get a client cert */
2943         if (s->state == SSL3_ST_CW_CERT_B)
2944                 {
2945                 /* If we get an error, we need to
2946                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2947                  * We then get retied later */
2948                 i=0;
2949                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2950                 if (i < 0)
2951                         {
2952                         s->rwstate=SSL_X509_LOOKUP;
2953                         return(-1);
2954                         }
2955                 s->rwstate=SSL_NOTHING;
2956                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2957                         {
2958                         s->state=SSL3_ST_CW_CERT_B;
2959                         if (    !SSL_use_certificate(s,x509) ||
2960                                 !SSL_use_PrivateKey(s,pkey))
2961                                 i=0;
2962                         }
2963                 else if (i == 1)
2964                         {
2965                         i=0;
2966                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2967                         }
2968
2969                 if (x509 != NULL) X509_free(x509);
2970                 if (pkey != NULL) EVP_PKEY_free(pkey);
2971                 if (i == 0)
2972                         {
2973                         if (s->version == SSL3_VERSION)
2974                                 {
2975                                 s->s3->tmp.cert_req=0;
2976                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2977                                 return(1);
2978                                 }
2979                         else
2980                                 {
2981                                 s->s3->tmp.cert_req=2;
2982                                 }
2983                         }
2984
2985                 /* Ok, we have a cert */
2986                 s->state=SSL3_ST_CW_CERT_C;
2987                 }
2988
2989         if (s->state == SSL3_ST_CW_CERT_C)
2990                 {
2991                 s->state=SSL3_ST_CW_CERT_D;
2992                 l=ssl3_output_cert_chain(s,
2993                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2994                 s->init_num=(int)l;
2995                 s->init_off=0;
2996                 }
2997         /* SSL3_ST_CW_CERT_D */
2998         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2999         }
3000
3001 #define has_bits(i,m)   (((i)&(m)) == (m))
3002
3003 int ssl3_check_cert_and_algorithm(SSL *s)
3004         {
3005         int i,idx;
3006         long alg_k,alg_a;
3007         EVP_PKEY *pkey=NULL;
3008         SESS_CERT *sc;
3009 #ifndef OPENSSL_NO_RSA
3010         RSA *rsa;
3011 #endif
3012 #ifndef OPENSSL_NO_DH
3013         DH *dh;
3014 #endif
3015
3016         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3017         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3018
3019         /* we don't have a certificate */
3020         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3021                 return(1);
3022
3023         sc=s->session->sess_cert;
3024         if (sc == NULL)
3025                 {
3026                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3027                 goto err;
3028                 }
3029
3030 #ifndef OPENSSL_NO_RSA
3031         rsa=s->session->sess_cert->peer_rsa_tmp;
3032 #endif
3033 #ifndef OPENSSL_NO_DH
3034         dh=s->session->sess_cert->peer_dh_tmp;
3035 #endif
3036
3037         /* This is the passed certificate */
3038
3039         idx=sc->peer_cert_type;
3040 #ifndef OPENSSL_NO_ECDH
3041         if (idx == SSL_PKEY_ECC)
3042                 {
3043                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3044                     s->s3->tmp.new_cipher) == 0)
3045                         { /* check failed */
3046                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3047                         goto f_err;
3048                         }
3049                 else
3050                         {
3051                         return 1;
3052                         }
3053                 }
3054 #endif
3055         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3056         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3057         EVP_PKEY_free(pkey);
3058
3059
3060         /* Check that we have a certificate if we require one */
3061         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3062                 {
3063                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3064                 goto f_err;
3065                 }
3066 #ifndef OPENSSL_NO_DSA
3067         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3068                 {
3069                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3070                 goto f_err;
3071                 }
3072 #endif
3073 #ifndef OPENSSL_NO_RSA
3074         if ((alg_k & SSL_kRSA) &&
3075                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3076                 {
3077                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3078                 goto f_err;
3079                 }
3080 #endif
3081 #ifndef OPENSSL_NO_DH
3082         if ((alg_k & SSL_kEDH) &&
3083                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3084                 {
3085                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3086                 goto f_err;
3087                 }
3088         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3089                 {
3090                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3091                 goto f_err;
3092                 }
3093 #ifndef OPENSSL_NO_DSA
3094         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3095                 {
3096                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3097                 goto f_err;
3098                 }
3099 #endif
3100 #endif
3101
3102         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3103                 {
3104 #ifndef OPENSSL_NO_RSA
3105                 if (alg_k & SSL_kRSA)
3106                         {
3107                         if (rsa == NULL
3108                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3109                                 {
3110                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3111                                 goto f_err;
3112                                 }
3113                         }
3114                 else
3115 #endif
3116 #ifndef OPENSSL_NO_DH
3117                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3118                             {
3119                             if (dh == NULL
3120                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3121                                 {
3122                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3123                                 goto f_err;
3124                                 }
3125                         }
3126                 else
3127 #endif
3128                         {
3129                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3130                         goto f_err;
3131                         }
3132                 }
3133         return(1);
3134 f_err:
3135         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3136 err:
3137         return(0);
3138         }
3139
3140 /* Check to see if handshake is full or resumed. Usually this is just a
3141  * case of checking to see if a cache hit has occurred. In the case of
3142  * session tickets we have to check the next message to be sure.
3143  */
3144
3145 #ifndef OPENSSL_NO_TLSEXT
3146 int ssl3_check_finished(SSL *s)
3147         {
3148         int ok;
3149         long n;
3150         /* If we have no ticket it cannot be a resumed session. */
3151         if (!s->session->tlsext_tick)
3152                 return 1;
3153         /* this function is called when we really expect a Certificate
3154          * message, so permit appropriate message length */
3155         n=s->method->ssl_get_message(s,
3156                 SSL3_ST_CR_CERT_A,
3157                 SSL3_ST_CR_CERT_B,
3158                 -1,
3159                 s->max_cert_list,
3160                 &ok);
3161         if (!ok) return((int)n);
3162         s->s3->tmp.reuse_message = 1;
3163         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3164                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3165                 return 2;
3166
3167         return 1;
3168         }
3169 #endif
3170
3171 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3172         {
3173         int i = 0;
3174 #ifndef OPENSSL_NO_ENGINE
3175         if (s->ctx->client_cert_engine)
3176                 {
3177                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3178                                                 SSL_get_client_CA_list(s),
3179                                                 px509, ppkey, NULL, NULL, NULL);
3180                 if (i != 0)
3181                         return i;
3182                 }
3183 #endif
3184         if (s->ctx->client_cert_cb)
3185                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3186         return i;
3187         }