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 #ifndef OPENSSL_NO_TLSEXT
 170 static int ssl3_check_finished(SSL *s);
 171 #endif
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         long num1;
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         s->in_handshake++;
 205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 206
 207         for (;;)
 208                 {
 209                 state=s->state;
 210
 211                 switch(s->state)
 212                         {
 213                 case SSL_ST_RENEGOTIATE:
 214                         s->new_session=1;
 215                         s->state=SSL_ST_CONNECT;
 216                         s->ctx->stats.sess_connect_renegotiate++;
 217                         /* break */
 218                 case SSL_ST_BEFORE:
 219                 case SSL_ST_CONNECT:
 220                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 221                 case SSL_ST_OK|SSL_ST_CONNECT:
 222
 223                         s->server=0;
 224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 225
 226                         if ((s->version & 0xff00 ) != 0x0300)
 227                                 {
 228                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 229                                 ret = -1;
 230                                 goto end;
 231                                 }
 232
 233                         /* s->version=SSL3_VERSION; */
 234                         s->type=SSL_ST_CONNECT;
 235
 236                         if (s->init_buf == NULL)
 237                                 {
 238                                 if ((buf=BUF_MEM_new()) == NULL)
 239                                         {
 240                                         ret= -1;
 241                                         goto end;
 242                                         }
 243                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 244                                         {
 245                                         ret= -1;
 246                                         goto end;
 247                                         }
 248                                 s->init_buf=buf;
 249                                 buf=NULL;
 250                                 }
 251
 252                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 253
 254                         /* setup buffing BIO */
 255                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 256
 257                         /* don't push the buffering BIO quite yet */
 258
 259                         ssl3_init_finished_mac(s);
 260
 261                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 262                         s->ctx->stats.sess_connect++;
 263                         s->init_num=0;
 264                         break;
 265
 266                 case SSL3_ST_CW_CLNT_HELLO_A:
 267                 case SSL3_ST_CW_CLNT_HELLO_B:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 273                         s->init_num=0;
 274
 275                         /* turn on buffering for the next lot of output */
 276                         if (s->bbio != s->wbio)
 277                                 s->wbio=BIO_push(s->bbio,s->wbio);
 278
 279                         break;
 280
 281                 case SSL3_ST_CR_SRVR_HELLO_A:
 282                 case SSL3_ST_CR_SRVR_HELLO_B:
 283                         ret=ssl3_get_server_hello(s);
 284                         if (ret <= 0) goto end;
 285
 286                         if (s->hit)
 287                                 s->state=SSL3_ST_CR_FINISHED_A;
 288                         else
 289                                 s->state=SSL3_ST_CR_CERT_A;
 290                         s->init_num=0;
 291                         break;
 292
 293                 case SSL3_ST_CR_CERT_A:
 294                 case SSL3_ST_CR_CERT_B:
 295 #ifndef OPENSSL_NO_TLSEXT
 296                         ret=ssl3_check_finished(s);
 297                         if (ret <= 0) goto end;
 298                         if (ret == 2)
 299                                 {
 300                                 s->hit = 1;
 301                                 if (s->tlsext_ticket_expected)
 302                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 303                                 else
 304                                         s->state=SSL3_ST_CR_FINISHED_A;
 305                                 s->init_num=0;
 306                                 break;
 307                                 }
 308 #endif
 309                         /* Check if it is anon DH/ECDH */
 310                         /* or PSK */
 311                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 312                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 313                                 {
 314                                 ret=ssl3_get_server_certificate(s);
 315                                 if (ret <= 0) goto end;
 316 #ifndef OPENSSL_NO_TLSEXT
 317                                 if (s->tlsext_status_expected)
 318                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 319                                 else
 320                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 321                                 }
 322                         else
 323                                 {
 324                                 skip = 1;
 325                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 326                                 }
 327 #else
 328                                 }
 329                         else
 330                                 skip=1;
 331
 332                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 333 #endif
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_CR_KEY_EXCH_A:
 338                 case SSL3_ST_CR_KEY_EXCH_B:
 339                         ret=ssl3_get_key_exchange(s);
 340                         if (ret <= 0) goto end;
 341                         s->state=SSL3_ST_CR_CERT_REQ_A;
 342                         s->init_num=0;
 343
 344                         /* at this point we check that we have the
 345                          * required stuff from the server */
 346                         if (!ssl3_check_cert_and_algorithm(s))
 347                                 {
 348                                 ret= -1;
 349                                 goto end;
 350                                 }
 351                         break;
 352
 353                 case SSL3_ST_CR_CERT_REQ_A:
 354                 case SSL3_ST_CR_CERT_REQ_B:
 355                         ret=ssl3_get_certificate_request(s);
 356                         if (ret <= 0) goto end;
 357                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 358                         s->init_num=0;
 359                         break;
 360
 361                 case SSL3_ST_CR_SRVR_DONE_A:
 362                 case SSL3_ST_CR_SRVR_DONE_B:
 363                         ret=ssl3_get_server_done(s);
 364                         if (ret <= 0) goto end;
 365                         if (s->s3->tmp.cert_req)
 366                                 s->state=SSL3_ST_CW_CERT_A;
 367                         else
 368                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 369                         s->init_num=0;
 370
 371                         break;
 372
 373                 case SSL3_ST_CW_CERT_A:
 374                 case SSL3_ST_CW_CERT_B:
 375                 case SSL3_ST_CW_CERT_C:
 376                 case SSL3_ST_CW_CERT_D:
 377                         ret=ssl3_send_client_certificate(s);
 378                         if (ret <= 0) goto end;
 379                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_CW_KEY_EXCH_A:
 384                 case SSL3_ST_CW_KEY_EXCH_B:
 385                         ret=ssl3_send_client_key_exchange(s);
 386                         if (ret <= 0) goto end;
 387                         /* EAY EAY EAY need to check for DH fix cert
 388                          * sent back */
 389                         /* For TLS, cert_req is set to 2, so a cert chain
 390                          * of nothing is sent, but no verify packet is sent */
 391                         /* XXX: For now, we do not support client
 392                          * authentication in ECDH cipher suites with
 393                          * ECDH (rather than ECDSA) certificates.
 394                          * We need to skip the certificate verify
 395                          * message when client's ECDH public key is sent
 396                          * inside the client certificate.
 397                          */
 398                         if (s->s3->tmp.cert_req == 1)
 399                                 {
 400                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 401                                 }
 402                         else
 403                                 {
 404                                 s->state=SSL3_ST_CW_CHANGE_A;
 405                                 s->s3->change_cipher_spec=0;
 406                                 }
 407
 408                         s->init_num=0;
 409                         break;
 410
 411                 case SSL3_ST_CW_CERT_VRFY_A:
 412                 case SSL3_ST_CW_CERT_VRFY_B:
 413                         ret=ssl3_send_client_verify(s);
 414                         if (ret <= 0) goto end;
 415                         s->state=SSL3_ST_CW_CHANGE_A;
 416                         s->init_num=0;
 417                         s->s3->change_cipher_spec=0;
 418                         break;
 419
 420                 case SSL3_ST_CW_CHANGE_A:
 421                 case SSL3_ST_CW_CHANGE_B:
 422                         ret=ssl3_send_change_cipher_spec(s,
 423                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 424                         if (ret <= 0) goto end;
 425                         s->state=SSL3_ST_CW_FINISHED_A;
 426                         s->init_num=0;
 427
 428                         s->session->cipher=s->s3->tmp.new_cipher;
 429 #ifdef OPENSSL_NO_COMP
 430                         s->session->compress_meth=0;
 431 #else
 432                         if (s->s3->tmp.new_compression == NULL)
 433                                 s->session->compress_meth=0;
 434                         else
 435                                 s->session->compress_meth=
 436                                         s->s3->tmp.new_compression->id;
 437 #endif
 438                         if (!s->method->ssl3_enc->setup_key_block(s))
 439                                 {
 440                                 ret= -1;
 441                                 goto end;
 442                                 }
 443
 444                         if (!s->method->ssl3_enc->change_cipher_state(s,
 445                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 446                                 {
 447                                 ret= -1;
 448                                 goto end;
 449                                 }
 450
 451                         break;
 452
 453                 case SSL3_ST_CW_FINISHED_A:
 454                 case SSL3_ST_CW_FINISHED_B:
 455                         ret=ssl3_send_finished(s,
 456                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 457                                 s->method->ssl3_enc->client_finished_label,
 458                                 s->method->ssl3_enc->client_finished_label_len);
 459                         if (ret <= 0) goto end;
 460                         s->state=SSL3_ST_CW_FLUSH;
 461
 462                         /* clear flags */
 463                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 464                         if (s->hit)
 465                                 {
 466                                 s->s3->tmp.next_state=SSL_ST_OK;
 467                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 468                                         {
 469                                         s->state=SSL_ST_OK;
 470                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 471                                         s->s3->delay_buf_pop_ret=0;
 472                                         }
 473                                 }
 474                         else
 475                                 {
 476 #ifndef OPENSSL_NO_TLSEXT
 477                                 /* Allow NewSessionTicket if ticket expected */
 478                                 if (s->tlsext_ticket_expected)
 479                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 480                                 else
 481 #endif
 482
 483                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 484                                 }
 485                         s->init_num=0;
 486                         break;
 487
 488 #ifndef OPENSSL_NO_TLSEXT
 489                 case SSL3_ST_CR_SESSION_TICKET_A:
 490                 case SSL3_ST_CR_SESSION_TICKET_B:
 491                         ret=ssl3_get_new_session_ticket(s);
 492                         if (ret <= 0) goto end;
 493                         s->state=SSL3_ST_CR_FINISHED_A;
 494                         s->init_num=0;
 495                 break;
 496
 497                 case SSL3_ST_CR_CERT_STATUS_A:
 498                 case SSL3_ST_CR_CERT_STATUS_B:
 499                         ret=ssl3_get_cert_status(s);
 500                         if (ret <= 0) goto end;
 501                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 502                         s->init_num=0;
 503                 break;
 504 #endif
 505
 506                 case SSL3_ST_CR_FINISHED_A:
 507                 case SSL3_ST_CR_FINISHED_B:
 508
 509                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 510                                 SSL3_ST_CR_FINISHED_B);
 511                         if (ret <= 0) goto end;
 512
 513                         if (s->hit)
 514                                 s->state=SSL3_ST_CW_CHANGE_A;
 515                         else
 516                                 s->state=SSL_ST_OK;
 517                         s->init_num=0;
 518                         break;
 519
 520                 case SSL3_ST_CW_FLUSH:
 521                         /* number of bytes to be flushed */
 522                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 523                         if (num1 > 0)
 524                                 {
 525                                 s->rwstate=SSL_WRITING;
 526                                 num1=BIO_flush(s->wbio);
 527                                 if (num1 <= 0) { ret= -1; goto end; }
 528                                 s->rwstate=SSL_NOTHING;
 529                                 }
 530
 531                         s->state=s->s3->tmp.next_state;
 532                         break;
 533
 534                 case SSL_ST_OK:
 535                         /* clean a few things up */
 536                         ssl3_cleanup_key_block(s);
 537
 538                         if (s->init_buf != NULL)
 539                                 {
 540                                 BUF_MEM_free(s->init_buf);
 541                                 s->init_buf=NULL;
 542                                 }
 543
 544                         /* If we are not 'joining' the last two packets,
 545                          * remove the buffering now */
 546                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 547                                 ssl_free_wbio_buffer(s);
 548                         /* else do it later in ssl3_write */
 549
 550                         s->init_num=0;
 551                         s->new_session=0;
 552
 553                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 554                         if (s->hit) s->ctx->stats.sess_hit++;
 555
 556                         ret=1;
 557                         /* s->server=0; */
 558                         s->handshake_func=ssl3_connect;
 559                         s->ctx->stats.sess_connect_good++;
 560
 561                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 562
 563                         goto end;
 564                         /* break; */
 565
 566                 default:
 567                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 568                         ret= -1;
 569                         goto end;
 570                         /* break; */
 571                         }
 572
 573                 /* did we do anything */
 574                 if (!s->s3->tmp.reuse_message && !skip)
 575                         {
 576                         if (s->debug)
 577                                 {
 578                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 579                                         goto end;
 580                                 }
 581
 582                         if ((cb != NULL) && (s->state != state))
 583                                 {
 584                                 new_state=s->state;
 585                                 s->state=state;
 586                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 587                                 s->state=new_state;
 588                                 }
 589                         }
 590                 skip=0;
 591                 }
 592 end:
 593         s->in_handshake--;
 594         if (buf != NULL)
 595                 BUF_MEM_free(buf);
 596         if (cb != NULL)
 597                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 598         return(ret);
 599         }
 600
 601
 602 int ssl3_client_hello(SSL *s)
 603         {
 604         unsigned char *buf;
 605         unsigned char *p,*d;
 606         int i;
 607         unsigned long Time,l;
 608 #ifndef OPENSSL_NO_COMP
 609         int j;
 610         SSL_COMP *comp;
 611 #endif
 612
 613         buf=(unsigned char *)s->init_buf->data;
 614         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 615                 {
 616                 if ((s->session == NULL) ||
 617                         (s->session->ssl_version != s->version) ||
 618                         (s->session->not_resumable))
 619                         {
 620                         if (!ssl_get_new_session(s,0))
 621                                 goto err;
 622                         }
 623                 /* else use the pre-loaded session */
 624
 625                 p=s->s3->client_random;
 626                 Time=(unsigned long)time(NULL);                 /* Time */
 627                 l2n(Time,p);
 628                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 629                         goto err;
 630
 631                 /* Do the message type and length last */
 632                 d=p= &(buf[4]);
 633
 634                 *(p++)=s->version>>8;
 635                 *(p++)=s->version&0xff;
 636                 s->client_version=s->version;
 637
 638                 /* Random stuff */
 639                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 640                 p+=SSL3_RANDOM_SIZE;
 641
 642                 /* Session ID */
 643                 if (s->new_session)
 644                         i=0;
 645                 else
 646                         i=s->session->session_id_length;
 647                 *(p++)=i;
 648                 if (i != 0)
 649                         {
 650                         if (i > (int)sizeof(s->session->session_id))
 651                                 {
 652                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 653                                 goto err;
 654                                 }
 655                         memcpy(p,s->session->session_id,i);
 656                         p+=i;
 657                         }
 658
 659                 /* Ciphers supported */
 660                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 661                 if (i == 0)
 662                         {
 663                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 664                         goto err;
 665                         }
 666                 s2n(i,p);
 667                 p+=i;
 668
 669                 /* COMPRESSION */
 670 #ifdef OPENSSL_NO_COMP
 671                 *(p++)=1;
 672 #else
 673
 674                 if ((s->options & SSL_OP_NO_COMPRESSION)
 675                                         || !s->ctx->comp_methods)
 676                         j=0;
 677                 else
 678                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 679                 *(p++)=1+j;
 680                 for (i=0; i<j; i++)
 681                         {
 682                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 683                         *(p++)=comp->id;
 684                         }
 685 #endif
 686                 *(p++)=0; /* Add the NULL method */
 687
 688 #ifndef OPENSSL_NO_TLSEXT
 689                 /* TLS extensions*/
 690                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 691                         {
 692                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 693                         goto err;
 694                         }
 695                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 696                         {
 697                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 698                         goto err;
 699                         }
 700 #endif
 701
 702                 l=(p-d);
 703                 d=buf;
 704                 *(d++)=SSL3_MT_CLIENT_HELLO;
 705                 l2n3(l,d);
 706
 707                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 708                 /* number of bytes to write */
 709                 s->init_num=p-buf;
 710                 s->init_off=0;
 711                 }
 712
 713         /* SSL3_ST_CW_CLNT_HELLO_B */
 714         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 715 err:
 716         return(-1);
 717         }
 718
 719 int ssl3_get_server_hello(SSL *s)
 720         {
 721         STACK_OF(SSL_CIPHER) *sk;
 722         const SSL_CIPHER *c;
 723         unsigned char *p,*d;
 724         int i,al,ok;
 725         unsigned int j;
 726         long n;
 727 #ifndef OPENSSL_NO_COMP
 728         SSL_COMP *comp;
 729 #endif
 730
 731         n=s->method->ssl_get_message(s,
 732                 SSL3_ST_CR_SRVR_HELLO_A,
 733                 SSL3_ST_CR_SRVR_HELLO_B,
 734                 -1,
 735                 20000, /* ?? */
 736                 &ok);
 737
 738         if (!ok) return((int)n);
 739
 740         if ( SSL_version(s) == DTLS1_VERSION)
 741                 {
 742                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 743                         {
 744                         if ( s->d1->send_cookie == 0)
 745                                 {
 746                                 s->s3->tmp.reuse_message = 1;
 747                                 return 1;
 748                                 }
 749                         else /* already sent a cookie */
 750                                 {
 751                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 752                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 753                                 goto f_err;
 754                                 }
 755                         }
 756                 }
 757
 758         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 759                 {
 760                 al=SSL_AD_UNEXPECTED_MESSAGE;
 761                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 762                 goto f_err;
 763                 }
 764
 765         d=p=(unsigned char *)s->init_msg;
 766
 767         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 768                 {
 769                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 770                 s->version=(s->version&0xff00)|p[1];
 771                 al=SSL_AD_PROTOCOL_VERSION;
 772                 goto f_err;
 773                 }
 774         p+=2;
 775
 776         /* load the server hello data */
 777         /* load the server random */
 778         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 779         p+=SSL3_RANDOM_SIZE;
 780
 781         /* get the session-id */
 782         j= *(p++);
 783
 784         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 785                 {
 786                 al=SSL_AD_ILLEGAL_PARAMETER;
 787                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 788                 goto f_err;
 789                 }
 790
 791 #ifndef OPENSSL_NO_TLSEXT
 792         /* check if we want to resume the session based on external pre-shared secret */
 793         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 794                 {
 795                 SSL_CIPHER *pref_cipher=NULL;
 796                 s->session->master_key_length=sizeof(s->session->master_key);
 797                 if (s->tls_session_secret_cb(s, s->session->master_key,
 798                                              &s->session->master_key_length,
 799                                              NULL, &pref_cipher,
 800                                              s->tls_session_secret_cb_arg))
 801                         {
 802                         s->session->cipher = pref_cipher ?
 803                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 804                         }
 805                 }
 806 #endif /* OPENSSL_NO_TLSEXT */
 807
 808         if (j != 0 && j == s->session->session_id_length
 809             && memcmp(p,s->session->session_id,j) == 0)
 810             {
 811             if(s->sid_ctx_length != s->session->sid_ctx_length
 812                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 813                 {
 814                 /* actually a client application bug */
 815                 al=SSL_AD_ILLEGAL_PARAMETER;
 816                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 817                 goto f_err;
 818                 }
 819             s->hit=1;
 820             }
 821         else    /* a miss or crap from the other end */
 822                 {
 823                 /* If we were trying for session-id reuse, make a new
 824                  * SSL_SESSION so we don't stuff up other people */
 825                 s->hit=0;
 826                 if (s->session->session_id_length > 0)
 827                         {
 828                         if (!ssl_get_new_session(s,0))
 829                                 {
 830                                 al=SSL_AD_INTERNAL_ERROR;
 831                                 goto f_err;
 832                                 }
 833                         }
 834                 s->session->session_id_length=j;
 835                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 836                 }
 837         p+=j;
 838         c=ssl_get_cipher_by_char(s,p);
 839         if (c == NULL)
 840                 {
 841                 /* unknown cipher */
 842                 al=SSL_AD_ILLEGAL_PARAMETER;
 843                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 844                 goto f_err;
 845                 }
 846         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 847
 848         sk=ssl_get_ciphers_by_id(s);
 849         i=sk_SSL_CIPHER_find(sk,c);
 850         if (i < 0)
 851                 {
 852                 /* we did not say we would use this cipher */
 853                 al=SSL_AD_ILLEGAL_PARAMETER;
 854                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 855                 goto f_err;
 856                 }
 857
 858         /* Depending on the session caching (internal/external), the cipher
 859            and/or cipher_id values may not be set. Make sure that
 860            cipher_id is set and use it for comparison. */
 861         if (s->session->cipher)
 862                 s->session->cipher_id = s->session->cipher->id;
 863         if (s->hit && (s->session->cipher_id != c->id))
 864                 {
 865                 if (!(s->options &
 866                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 867                         {
 868                         al=SSL_AD_ILLEGAL_PARAMETER;
 869                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 870                         goto f_err;
 871                         }
 872                 }
 873         s->s3->tmp.new_cipher=c;
 874         ssl3_digest_cached_records(s);
 875
 876         /* lets get the compression algorithm */
 877         /* COMPRESSION */
 878 #ifdef OPENSSL_NO_COMP
 879         if (*(p++) != 0)
 880                 {
 881                 al=SSL_AD_ILLEGAL_PARAMETER;
 882                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 883                 goto f_err;
 884                 }
 885 #else
 886         j= *(p++);
 887         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 888                 comp=NULL;
 889         else
 890                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 891
 892         if ((j != 0) && (comp == NULL))
 893                 {
 894                 al=SSL_AD_ILLEGAL_PARAMETER;
 895                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 896                 goto f_err;
 897                 }
 898         else
 899                 {
 900                 s->s3->tmp.new_compression=comp;
 901                 }
 902 #endif
 903
 904 #ifndef OPENSSL_NO_TLSEXT
 905         /* TLS extensions*/
 906         if (s->version > SSL3_VERSION)
 907                 {
 908                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 909                         {
 910                         /* 'al' set by ssl_parse_serverhello_tlsext */
 911                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 912                         goto f_err;
 913                         }
 914                 if (ssl_check_serverhello_tlsext(s) <= 0)
 915                         {
 916                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 917                                 goto err;
 918                         }
 919                 }
 920 #endif
 921
 922         if (p != (d+n))
 923                 {
 924                 /* wrong packet length */
 925                 al=SSL_AD_DECODE_ERROR;
 926                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 927                 goto err;
 928                 }
 929
 930         return(1);
 931 f_err:
 932         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 933 err:
 934         return(-1);
 935         }
 936
 937 int ssl3_get_server_certificate(SSL *s)
 938         {
 939         int al,i,ok,ret= -1;
 940         unsigned long n,nc,llen,l;
 941         X509 *x=NULL;
 942         const unsigned char *q,*p;
 943         unsigned char *d;
 944         STACK_OF(X509) *sk=NULL;
 945         SESS_CERT *sc;
 946         EVP_PKEY *pkey=NULL;
 947         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 948
 949         n=s->method->ssl_get_message(s,
 950                 SSL3_ST_CR_CERT_A,
 951                 SSL3_ST_CR_CERT_B,
 952                 -1,
 953                 s->max_cert_list,
 954                 &ok);
 955
 956         if (!ok) return((int)n);
 957
 958         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 959                 {
 960                 s->s3->tmp.reuse_message=1;
 961                 return(1);
 962                 }
 963
 964         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 965                 {
 966                 al=SSL_AD_UNEXPECTED_MESSAGE;
 967                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 968                 goto f_err;
 969                 }
 970         p=d=(unsigned char *)s->init_msg;
 971
 972         if ((sk=sk_X509_new_null()) == NULL)
 973                 {
 974                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 975                 goto err;
 976                 }
 977
 978         n2l3(p,llen);
 979         if (llen+3 != n)
 980                 {
 981                 al=SSL_AD_DECODE_ERROR;
 982                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 983                 goto f_err;
 984                 }
 985         for (nc=0; nc<llen; )
 986                 {
 987                 n2l3(p,l);
 988                 if ((l+nc+3) > llen)
 989                         {
 990                         al=SSL_AD_DECODE_ERROR;
 991                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 992                         goto f_err;
 993                         }
 994
 995                 q=p;
 996                 x=d2i_X509(NULL,&q,l);
 997                 if (x == NULL)
 998                         {
 999                         al=SSL_AD_BAD_CERTIFICATE;
1000                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1001                         goto f_err;
1002                         }
1003                 if (q != (p+l))
1004                         {
1005                         al=SSL_AD_DECODE_ERROR;
1006                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1007                         goto f_err;
1008                         }
1009                 if (!sk_X509_push(sk,x))
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1012                         goto err;
1013                         }
1014                 x=NULL;
1015                 nc+=l+3;
1016                 p=q;
1017                 }
1018
1019         i=ssl_verify_cert_chain(s,sk);
1020         if ((s->verify_mode != SSL_VERIFY_NONE) && (!i)
1021 #ifndef OPENSSL_NO_KRB5
1022             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1023                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1024 #endif /* OPENSSL_NO_KRB5 */
1025                 )
1026                 {
1027                 al=ssl_verify_alarm_type(s->verify_result);
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1029                 goto f_err;
1030                 }
1031         ERR_clear_error(); /* but we keep s->verify_result */
1032
1033         sc=ssl_sess_cert_new();
1034         if (sc == NULL) goto err;
1035
1036         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1037         s->session->sess_cert=sc;
1038
1039         sc->cert_chain=sk;
1040         /* Inconsistency alert: cert_chain does include the peer's
1041          * certificate, which we don't include in s3_srvr.c */
1042         x=sk_X509_value(sk,0);
1043         sk=NULL;
1044         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1045
1046         pkey=X509_get_pubkey(x);
1047
1048         /* VRS: allow null cert if auth == KRB5 */
1049         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1050                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1051                     ? 0 : 1;
1052
1053 #ifdef KSSL_DEBUG
1054         printf("pkey,x = %p, %p\n", pkey,x);
1055         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1056         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1057                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1058 #endif    /* KSSL_DEBUG */
1059
1060         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1061                 {
1062                 x=NULL;
1063                 al=SSL3_AL_FATAL;
1064                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1065                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1066                 goto f_err;
1067                 }
1068
1069         i=ssl_cert_type(x,pkey);
1070         if (need_cert && i < 0)
1071                 {
1072                 x=NULL;
1073                 al=SSL3_AL_FATAL;
1074                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1075                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1076                 goto f_err;
1077                 }
1078
1079         if (need_cert)
1080                 {
1081                 sc->peer_cert_type=i;
1082                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1083                 /* Why would the following ever happen?
1084                  * We just created sc a couple of lines ago. */
1085                 if (sc->peer_pkeys[i].x509 != NULL)
1086                         X509_free(sc->peer_pkeys[i].x509);
1087                 sc->peer_pkeys[i].x509=x;
1088                 sc->peer_key= &(sc->peer_pkeys[i]);
1089
1090                 if (s->session->peer != NULL)
1091                         X509_free(s->session->peer);
1092                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1093                 s->session->peer=x;
1094                 }
1095         else
1096                 {
1097                 sc->peer_cert_type=i;
1098                 sc->peer_key= NULL;
1099
1100                 if (s->session->peer != NULL)
1101                         X509_free(s->session->peer);
1102                 s->session->peer=NULL;
1103                 }
1104         s->session->verify_result = s->verify_result;
1105
1106         x=NULL;
1107         ret=1;
1108
1109         if (0)
1110                 {
1111 f_err:
1112                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1113                 }
1114 err:
1115         EVP_PKEY_free(pkey);
1116         X509_free(x);
1117         sk_X509_pop_free(sk,X509_free);
1118         return(ret);
1119         }
1120
1121 int ssl3_get_key_exchange(SSL *s)
1122         {
1123 #ifndef OPENSSL_NO_RSA
1124         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1125 #endif
1126         EVP_MD_CTX md_ctx;
1127         unsigned char *param,*p;
1128         int al,i,j,param_len,ok;
1129         long n,alg_k,alg_a;
1130         EVP_PKEY *pkey=NULL;
1131 #ifndef OPENSSL_NO_RSA
1132         RSA *rsa=NULL;
1133 #endif
1134 #ifndef OPENSSL_NO_DH
1135         DH *dh=NULL;
1136 #endif
1137 #ifndef OPENSSL_NO_ECDH
1138         EC_KEY *ecdh = NULL;
1139         BN_CTX *bn_ctx = NULL;
1140         EC_POINT *srvr_ecpoint = NULL;
1141         int curve_nid = 0;
1142         int encoded_pt_len = 0;
1143 #endif
1144
1145         /* use same message size as in ssl3_get_certificate_request()
1146          * as ServerKeyExchange message may be skipped */
1147         n=s->method->ssl_get_message(s,
1148                 SSL3_ST_CR_KEY_EXCH_A,
1149                 SSL3_ST_CR_KEY_EXCH_B,
1150                 -1,
1151                 s->max_cert_list,
1152                 &ok);
1153         if (!ok) return((int)n);
1154
1155         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1156                 {
1157 #ifndef OPENSSL_NO_PSK
1158                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1159                    omitted if no identity hint is sent. Set
1160                    session->sess_cert anyway to avoid problems
1161                    later.*/
1162                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1163                         {
1164                         s->session->sess_cert=ssl_sess_cert_new();
1165                         if (s->ctx->psk_identity_hint)
1166                                 OPENSSL_free(s->ctx->psk_identity_hint);
1167                         s->ctx->psk_identity_hint = NULL;
1168                         }
1169 #endif
1170                 s->s3->tmp.reuse_message=1;
1171                 return(1);
1172                 }
1173
1174         param=p=(unsigned char *)s->init_msg;
1175         if (s->session->sess_cert != NULL)
1176                 {
1177 #ifndef OPENSSL_NO_RSA
1178                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1179                         {
1180                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1181                         s->session->sess_cert->peer_rsa_tmp=NULL;
1182                         }
1183 #endif
1184 #ifndef OPENSSL_NO_DH
1185                 if (s->session->sess_cert->peer_dh_tmp)
1186                         {
1187                         DH_free(s->session->sess_cert->peer_dh_tmp);
1188                         s->session->sess_cert->peer_dh_tmp=NULL;
1189                         }
1190 #endif
1191 #ifndef OPENSSL_NO_ECDH
1192                 if (s->session->sess_cert->peer_ecdh_tmp)
1193                         {
1194                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1195                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1196                         }
1197 #endif
1198                 }
1199         else
1200                 {
1201                 s->session->sess_cert=ssl_sess_cert_new();
1202                 }
1203
1204         param_len=0;
1205         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1206         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1207         EVP_MD_CTX_init(&md_ctx);
1208
1209 #ifndef OPENSSL_NO_PSK
1210         if (alg_k & SSL_kPSK)
1211                 {
1212                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1213
1214                 al=SSL_AD_HANDSHAKE_FAILURE;
1215                 n2s(p,i);
1216                 param_len=i+2;
1217                 /* Store PSK identity hint for later use, hint is used
1218                  * in ssl3_send_client_key_exchange.  Assume that the
1219                  * maximum length of a PSK identity hint can be as
1220                  * long as the maximum length of a PSK identity. */
1221                 if (i > PSK_MAX_IDENTITY_LEN)
1222                         {
1223                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1224                                 SSL_R_DATA_LENGTH_TOO_LONG);
1225                         goto f_err;
1226                         }
1227                 if (param_len > n)
1228                         {
1229                         al=SSL_AD_DECODE_ERROR;
1230                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1231                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1232                         goto f_err;
1233                         }
1234                 /* If received PSK identity hint contains NULL
1235                  * characters, the hint is truncated from the first
1236                  * NULL. p may not be ending with NULL, so create a
1237                  * NULL-terminated string. */
1238                 memcpy(tmp_id_hint, p, i);
1239                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1240                 if (s->ctx->psk_identity_hint != NULL)
1241                         OPENSSL_free(s->ctx->psk_identity_hint);
1242                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1243                 if (s->ctx->psk_identity_hint == NULL)
1244                         {
1245                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1246                         goto f_err;
1247                         }
1248
1249                 p+=i;
1250                 n-=param_len;
1251                 }
1252         else
1253 #endif /* !OPENSSL_NO_PSK */
1254 #ifndef OPENSSL_NO_RSA
1255         if (alg_k & SSL_kRSA)
1256                 {
1257                 if ((rsa=RSA_new()) == NULL)
1258                         {
1259                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1260                         goto err;
1261                         }
1262                 n2s(p,i);
1263                 param_len=i+2;
1264                 if (param_len > n)
1265                         {
1266                         al=SSL_AD_DECODE_ERROR;
1267                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1268                         goto f_err;
1269                         }
1270                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1271                         {
1272                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1273                         goto err;
1274                         }
1275                 p+=i;
1276
1277                 n2s(p,i);
1278                 param_len+=i+2;
1279                 if (param_len > n)
1280                         {
1281                         al=SSL_AD_DECODE_ERROR;
1282                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1283                         goto f_err;
1284                         }
1285                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1286                         {
1287                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1288                         goto err;
1289                         }
1290                 p+=i;
1291                 n-=param_len;
1292
1293                 /* this should be because we are using an export cipher */
1294                 if (alg_a & SSL_aRSA)
1295                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1296                 else
1297                         {
1298                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1299                         goto err;
1300                         }
1301                 s->session->sess_cert->peer_rsa_tmp=rsa;
1302                 rsa=NULL;
1303                 }
1304 #else /* OPENSSL_NO_RSA */
1305         if (0)
1306                 ;
1307 #endif
1308 #ifndef OPENSSL_NO_DH
1309         else if (alg_k & SSL_kEDH)
1310                 {
1311                 if ((dh=DH_new()) == NULL)
1312                         {
1313                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1314                         goto err;
1315                         }
1316                 n2s(p,i);
1317                 param_len=i+2;
1318                 if (param_len > n)
1319                         {
1320                         al=SSL_AD_DECODE_ERROR;
1321                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1322                         goto f_err;
1323                         }
1324                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1325                         {
1326                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1327                         goto err;
1328                         }
1329                 p+=i;
1330
1331                 n2s(p,i);
1332                 param_len+=i+2;
1333                 if (param_len > n)
1334                         {
1335                         al=SSL_AD_DECODE_ERROR;
1336                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1337                         goto f_err;
1338                         }
1339                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1340                         {
1341                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1342                         goto err;
1343                         }
1344                 p+=i;
1345
1346                 n2s(p,i);
1347                 param_len+=i+2;
1348                 if (param_len > n)
1349                         {
1350                         al=SSL_AD_DECODE_ERROR;
1351                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1352                         goto f_err;
1353                         }
1354                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1355                         {
1356                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1357                         goto err;
1358                         }
1359                 p+=i;
1360                 n-=param_len;
1361
1362 #ifndef OPENSSL_NO_RSA
1363                 if (alg_a & SSL_aRSA)
1364                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1365 #else
1366                 if (0)
1367                         ;
1368 #endif
1369 #ifndef OPENSSL_NO_DSA
1370                 else if (alg_a & SSL_aDSS)
1371                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1372 #endif
1373                 /* else anonymous DH, so no certificate or pkey. */
1374
1375                 s->session->sess_cert->peer_dh_tmp=dh;
1376                 dh=NULL;
1377                 }
1378         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1379                 {
1380                 al=SSL_AD_ILLEGAL_PARAMETER;
1381                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1382                 goto f_err;
1383                 }
1384 #endif /* !OPENSSL_NO_DH */
1385
1386 #ifndef OPENSSL_NO_ECDH
1387         else if (alg_k & SSL_kEECDH)
1388                 {
1389                 EC_GROUP *ngroup;
1390                 const EC_GROUP *group;
1391
1392                 if ((ecdh=EC_KEY_new()) == NULL)
1393                         {
1394                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1395                         goto err;
1396                         }
1397
1398                 /* Extract elliptic curve parameters and the
1399                  * server's ephemeral ECDH public key.
1400                  * Keep accumulating lengths of various components in
1401                  * param_len and make sure it never exceeds n.
1402                  */
1403
1404                 /* XXX: For now we only support named (not generic) curves
1405                  * and the ECParameters in this case is just three bytes.
1406                  */
1407                 param_len=3;
1408                 if ((param_len > n) ||
1409                     (*p != NAMED_CURVE_TYPE) ||
1410                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1411                         {
1412                         al=SSL_AD_INTERNAL_ERROR;
1413                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1414                         goto f_err;
1415                         }
1416
1417                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1418                 if (ngroup == NULL)
1419                         {
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1421                         goto err;
1422                         }
1423                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1424                         {
1425                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1426                         goto err;
1427                         }
1428                 EC_GROUP_free(ngroup);
1429
1430                 group = EC_KEY_get0_group(ecdh);
1431
1432                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1433                     (EC_GROUP_get_degree(group) > 163))
1434                         {
1435                         al=SSL_AD_EXPORT_RESTRICTION;
1436                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1437                         goto f_err;
1438                         }
1439
1440                 p+=3;
1441
1442                 /* Next, get the encoded ECPoint */
1443                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1444                     ((bn_ctx = BN_CTX_new()) == NULL))
1445                         {
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1447                         goto err;
1448                         }
1449
1450                 encoded_pt_len = *p;  /* length of encoded point */
1451                 p+=1;
1452                 param_len += (1 + encoded_pt_len);
1453                 if ((param_len > n) ||
1454                     (EC_POINT_oct2point(group, srvr_ecpoint,
1455                         p, encoded_pt_len, bn_ctx) == 0))
1456                         {
1457                         al=SSL_AD_DECODE_ERROR;
1458                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1459                         goto f_err;
1460                         }
1461
1462                 n-=param_len;
1463                 p+=encoded_pt_len;
1464
1465                 /* The ECC/TLS specification does not mention
1466                  * the use of DSA to sign ECParameters in the server
1467                  * key exchange message. We do support RSA and ECDSA.
1468                  */
1469                 if (0) ;
1470 #ifndef OPENSSL_NO_RSA
1471                 else if (alg_a & SSL_aRSA)
1472                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1473 #endif
1474 #ifndef OPENSSL_NO_ECDSA
1475                 else if (alg_a & SSL_aECDSA)
1476                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1477 #endif
1478                 /* else anonymous ECDH, so no certificate or pkey. */
1479                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1480                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1481                 ecdh=NULL;
1482                 BN_CTX_free(bn_ctx);
1483                 EC_POINT_free(srvr_ecpoint);
1484                 srvr_ecpoint = NULL;
1485                 }
1486         else if (alg_k)
1487                 {
1488                 al=SSL_AD_UNEXPECTED_MESSAGE;
1489                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1490                 goto f_err;
1491                 }
1492 #endif /* !OPENSSL_NO_ECDH */
1493
1494
1495         /* p points to the next byte, there are 'n' bytes left */
1496
1497         /* if it was signed, check the signature */
1498         if (pkey != NULL)
1499                 {
1500                 n2s(p,i);
1501                 n-=2;
1502                 j=EVP_PKEY_size(pkey);
1503
1504                 if ((i != n) || (n > j) || (n <= 0))
1505                         {
1506                         /* wrong packet length */
1507                         al=SSL_AD_DECODE_ERROR;
1508                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1509                         goto f_err;
1510                         }
1511
1512 #ifndef OPENSSL_NO_RSA
1513                 if (pkey->type == EVP_PKEY_RSA)
1514                         {
1515                         int num;
1516
1517                         j=0;
1518                         q=md_buf;
1519                         for (num=2; num > 0; num--)
1520                                 {
1521                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1522                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1523                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1524                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1525                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1526                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1527                                 q+=i;
1528                                 j+=i;
1529                                 }
1530                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1531                                                                 pkey->pkey.rsa);
1532                         if (i < 0)
1533                                 {
1534                                 al=SSL_AD_DECRYPT_ERROR;
1535                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1536                                 goto f_err;
1537                                 }
1538                         if (i == 0)
1539                                 {
1540                                 /* bad signature */
1541                                 al=SSL_AD_DECRYPT_ERROR;
1542                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1543                                 goto f_err;
1544                                 }
1545                         }
1546                 else
1547 #endif
1548 #ifndef OPENSSL_NO_DSA
1549                         if (pkey->type == EVP_PKEY_DSA)
1550                         {
1551                         /* lets do DSS */
1552                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1553                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1554                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1555                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1556                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1557                                 {
1558                                 /* bad signature */
1559                                 al=SSL_AD_DECRYPT_ERROR;
1560                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1561                                 goto f_err;
1562                                 }
1563                         }
1564                 else
1565 #endif
1566 #ifndef OPENSSL_NO_ECDSA
1567                         if (pkey->type == EVP_PKEY_EC)
1568                         {
1569                         /* let's do ECDSA */
1570                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1571                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1572                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1573                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1574                         if (!EVP_VerifyFinal(&md_ctx,p,(int)n,pkey))
1575                                 {
1576                                 /* bad signature */
1577                                 al=SSL_AD_DECRYPT_ERROR;
1578                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1579                                 goto f_err;
1580                                 }
1581                         }
1582                 else
1583 #endif
1584                         {
1585                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1586                         goto err;
1587                         }
1588                 }
1589         else
1590                 {
1591                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1592                         /* aNULL or kPSK do not need public keys */
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1595                         goto err;
1596                         }
1597                 /* still data left over */
1598                 if (n != 0)
1599                         {
1600                         al=SSL_AD_DECODE_ERROR;
1601                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1602                         goto f_err;
1603                         }
1604                 }
1605         EVP_PKEY_free(pkey);
1606         EVP_MD_CTX_cleanup(&md_ctx);
1607         return(1);
1608 f_err:
1609         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1610 err:
1611         EVP_PKEY_free(pkey);
1612 #ifndef OPENSSL_NO_RSA
1613         if (rsa != NULL)
1614                 RSA_free(rsa);
1615 #endif
1616 #ifndef OPENSSL_NO_DH
1617         if (dh != NULL)
1618                 DH_free(dh);
1619 #endif
1620 #ifndef OPENSSL_NO_ECDH
1621         BN_CTX_free(bn_ctx);
1622         EC_POINT_free(srvr_ecpoint);
1623         if (ecdh != NULL)
1624                 EC_KEY_free(ecdh);
1625 #endif
1626         EVP_MD_CTX_cleanup(&md_ctx);
1627         return(-1);
1628         }
1629
1630 int ssl3_get_certificate_request(SSL *s)
1631         {
1632         int ok,ret=0;
1633         unsigned long n,nc,l;
1634         unsigned int llen,ctype_num,i;
1635         X509_NAME *xn=NULL;
1636         const unsigned char *p,*q;
1637         unsigned char *d;
1638         STACK_OF(X509_NAME) *ca_sk=NULL;
1639
1640         n=s->method->ssl_get_message(s,
1641                 SSL3_ST_CR_CERT_REQ_A,
1642                 SSL3_ST_CR_CERT_REQ_B,
1643                 -1,
1644                 s->max_cert_list,
1645                 &ok);
1646
1647         if (!ok) return((int)n);
1648
1649         s->s3->tmp.cert_req=0;
1650
1651         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1652                 {
1653                 s->s3->tmp.reuse_message=1;
1654                 return(1);
1655                 }
1656
1657         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1658                 {
1659                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1660                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1661                 goto err;
1662                 }
1663
1664         /* TLS does not like anon-DH with client cert */
1665         if (s->version > SSL3_VERSION)
1666                 {
1667                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1668                         {
1669                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1670                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1671                         goto err;
1672                         }
1673                 }
1674
1675         p=d=(unsigned char *)s->init_msg;
1676
1677         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1678                 {
1679                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1680                 goto err;
1681                 }
1682
1683         /* get the certificate types */
1684         ctype_num= *(p++);
1685         if (ctype_num > SSL3_CT_NUMBER)
1686                 ctype_num=SSL3_CT_NUMBER;
1687         for (i=0; i<ctype_num; i++)
1688                 s->s3->tmp.ctype[i]= p[i];
1689         p+=ctype_num;
1690
1691         /* get the CA RDNs */
1692         n2s(p,llen);
1693 #if 0
1694 {
1695 FILE *out;
1696 out=fopen("/tmp/vsign.der","w");
1697 fwrite(p,1,llen,out);
1698 fclose(out);
1699 }
1700 #endif
1701
1702         if ((llen+ctype_num+2+1) != n)
1703                 {
1704                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1705                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1706                 goto err;
1707                 }
1708
1709         for (nc=0; nc<llen; )
1710                 {
1711                 n2s(p,l);
1712                 if ((l+nc+2) > llen)
1713                         {
1714                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1715                                 goto cont; /* netscape bugs */
1716                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1717                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1718                         goto err;
1719                         }
1720
1721                 q=p;
1722
1723                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1724                         {
1725                         /* If netscape tolerance is on, ignore errors */
1726                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1727                                 goto cont;
1728                         else
1729                                 {
1730                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1731                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1732                                 goto err;
1733                                 }
1734                         }
1735
1736                 if (q != (p+l))
1737                         {
1738                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1739                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1740                         goto err;
1741                         }
1742                 if (!sk_X509_NAME_push(ca_sk,xn))
1743                         {
1744                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1745                         goto err;
1746                         }
1747
1748                 p+=l;
1749                 nc+=l+2;
1750                 }
1751
1752         if (0)
1753                 {
1754 cont:
1755                 ERR_clear_error();
1756                 }
1757
1758         /* we should setup a certificate to return.... */
1759         s->s3->tmp.cert_req=1;
1760         s->s3->tmp.ctype_num=ctype_num;
1761         if (s->s3->tmp.ca_names != NULL)
1762                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1763         s->s3->tmp.ca_names=ca_sk;
1764         ca_sk=NULL;
1765
1766         ret=1;
1767 err:
1768         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1769         return(ret);
1770         }
1771
1772 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1773         {
1774         return(X509_NAME_cmp(*a,*b));
1775         }
1776 #ifndef OPENSSL_NO_TLSEXT
1777 int ssl3_get_new_session_ticket(SSL *s)
1778         {
1779         int ok,al,ret=0, ticklen;
1780         long n;
1781         const unsigned char *p;
1782         unsigned char *d;
1783
1784         n=s->method->ssl_get_message(s,
1785                 SSL3_ST_CR_SESSION_TICKET_A,
1786                 SSL3_ST_CR_SESSION_TICKET_B,
1787                 -1,
1788                 16384,
1789                 &ok);
1790
1791         if (!ok)
1792                 return((int)n);
1793
1794         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1795                 {
1796                 s->s3->tmp.reuse_message=1;
1797                 return(1);
1798                 }
1799         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1800                 {
1801                 al=SSL_AD_UNEXPECTED_MESSAGE;
1802                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1803                 goto f_err;
1804                 }
1805         if (n < 6)
1806                 {
1807                 /* need at least ticket_lifetime_hint + ticket length */
1808                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1809                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1810                 goto f_err;
1811                 }
1812         p=d=(unsigned char *)s->init_msg;
1813         n2l(p, s->session->tlsext_tick_lifetime_hint);
1814         n2s(p, ticklen);
1815         /* ticket_lifetime_hint + ticket_length + ticket */
1816         if (ticklen + 6 != n)
1817                 {
1818                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1819                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1820                 goto f_err;
1821                 }
1822         if (s->session->tlsext_tick)
1823                 {
1824                 OPENSSL_free(s->session->tlsext_tick);
1825                 s->session->tlsext_ticklen = 0;
1826                 }
1827         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1828         if (!s->session->tlsext_tick)
1829                 {
1830                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1831                 goto err;
1832                 }
1833         memcpy(s->session->tlsext_tick, p, ticklen);
1834         s->session->tlsext_ticklen = ticklen;
1835
1836         ret=1;
1837         return(ret);
1838 f_err:
1839         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1840 err:
1841         return(-1);
1842         }
1843
1844 int ssl3_get_cert_status(SSL *s)
1845         {
1846         int ok, al;
1847         unsigned long resplen,n;
1848         const unsigned char *p;
1849
1850         n=s->method->ssl_get_message(s,
1851                 SSL3_ST_CR_CERT_STATUS_A,
1852                 SSL3_ST_CR_CERT_STATUS_B,
1853                 SSL3_MT_CERTIFICATE_STATUS,
1854                 16384,
1855                 &ok);
1856
1857         if (!ok) return((int)n);
1858         if (n < 4)
1859                 {
1860                 /* need at least status type + length */
1861                 al = SSL_AD_DECODE_ERROR;
1862                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1863                 goto f_err;
1864                 }
1865         p = (unsigned char *)s->init_msg;
1866         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1867                 {
1868                 al = SSL_AD_DECODE_ERROR;
1869                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1870                 goto f_err;
1871                 }
1872         n2l3(p, resplen);
1873         if (resplen + 4 != n)
1874                 {
1875                 al = SSL_AD_DECODE_ERROR;
1876                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1877                 goto f_err;
1878                 }
1879         if (s->tlsext_ocsp_resp)
1880                 OPENSSL_free(s->tlsext_ocsp_resp);
1881         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1882         if (!s->tlsext_ocsp_resp)
1883                 {
1884                 al = SSL_AD_INTERNAL_ERROR;
1885                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1886                 goto f_err;
1887                 }
1888         s->tlsext_ocsp_resplen = resplen;
1889         if (s->ctx->tlsext_status_cb)
1890                 {
1891                 int ret;
1892                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1893                 if (ret == 0)
1894                         {
1895                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1896                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1897                         goto f_err;
1898                         }
1899                 if (ret < 0)
1900                         {
1901                         al = SSL_AD_INTERNAL_ERROR;
1902                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1903                         goto f_err;
1904                         }
1905                 }
1906         return 1;
1907 f_err:
1908         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1909         return(-1);
1910         }
1911 #endif
1912
1913 int ssl3_get_server_done(SSL *s)
1914         {
1915         int ok,ret=0;
1916         long n;
1917
1918         n=s->method->ssl_get_message(s,
1919                 SSL3_ST_CR_SRVR_DONE_A,
1920                 SSL3_ST_CR_SRVR_DONE_B,
1921                 SSL3_MT_SERVER_DONE,
1922                 30, /* should be very small, like 0 :-) */
1923                 &ok);
1924
1925         if (!ok) return((int)n);
1926         if (n > 0)
1927                 {
1928                 /* should contain no data */
1929                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1930                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1931                 return -1;
1932                 }
1933         ret=1;
1934         return(ret);
1935         }
1936
1937
1938 int ssl3_send_client_key_exchange(SSL *s)
1939         {
1940         unsigned char *p,*d;
1941         int n;
1942         unsigned long alg_k;
1943 #ifndef OPENSSL_NO_RSA
1944         unsigned char *q;
1945         EVP_PKEY *pkey=NULL;
1946 #endif
1947 #ifndef OPENSSL_NO_KRB5
1948         KSSL_ERR kssl_err;
1949 #endif /* OPENSSL_NO_KRB5 */
1950 #ifndef OPENSSL_NO_ECDH
1951         EC_KEY *clnt_ecdh = NULL;
1952         const EC_POINT *srvr_ecpoint = NULL;
1953         EVP_PKEY *srvr_pub_pkey = NULL;
1954         unsigned char *encodedPoint = NULL;
1955         int encoded_pt_len = 0;
1956         BN_CTX * bn_ctx = NULL;
1957 #endif
1958
1959         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1960                 {
1961                 d=(unsigned char *)s->init_buf->data;
1962                 p= &(d[4]);
1963
1964                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1965
1966                 /* Fool emacs indentation */
1967                 if (0) {}
1968 #ifndef OPENSSL_NO_RSA
1969                 else if (alg_k & SSL_kRSA)
1970                         {
1971                         RSA *rsa;
1972                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1973
1974                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1975                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1976                         else
1977                                 {
1978                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1979                                 if ((pkey == NULL) ||
1980                                         (pkey->type != EVP_PKEY_RSA) ||
1981                                         (pkey->pkey.rsa == NULL))
1982                                         {
1983                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1984                                         goto err;
1985                                         }
1986                                 rsa=pkey->pkey.rsa;
1987                                 EVP_PKEY_free(pkey);
1988                                 }
1989
1990                         tmp_buf[0]=s->client_version>>8;
1991                         tmp_buf[1]=s->client_version&0xff;
1992                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1993                                         goto err;
1994
1995                         s->session->master_key_length=sizeof tmp_buf;
1996
1997                         q=p;
1998                         /* Fix buf for TLS and beyond */
1999                         if (s->version > SSL3_VERSION)
2000                                 p+=2;
2001                         n=RSA_public_encrypt(sizeof tmp_buf,
2002                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2003 #ifdef PKCS1_CHECK
2004                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2005                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2006 #endif
2007                         if (n <= 0)
2008                                 {
2009                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2010                                 goto err;
2011                                 }
2012
2013                         /* Fix buf for TLS and beyond */
2014                         if (s->version > SSL3_VERSION)
2015                                 {
2016                                 s2n(n,q);
2017                                 n+=2;
2018                                 }
2019
2020                         s->session->master_key_length=
2021                                 s->method->ssl3_enc->generate_master_secret(s,
2022                                         s->session->master_key,
2023                                         tmp_buf,sizeof tmp_buf);
2024                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2025                         }
2026 #endif
2027 #ifndef OPENSSL_NO_KRB5
2028                 else if (alg_k & SSL_kKRB5)
2029                         {
2030                         krb5_error_code krb5rc;
2031                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2032                         /*  krb5_data   krb5_ap_req;  */
2033                         krb5_data       *enc_ticket;
2034                         krb5_data       authenticator, *authp = NULL;
2035                         EVP_CIPHER_CTX  ciph_ctx;
2036                         EVP_CIPHER      *enc = NULL;
2037                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2038                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2039                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2040                                                 + EVP_MAX_IV_LENGTH];
2041                         int             padl, outl = sizeof(epms);
2042
2043                         EVP_CIPHER_CTX_init(&ciph_ctx);
2044
2045 #ifdef KSSL_DEBUG
2046                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2047                                 alg_k, SSL_kKRB5);
2048 #endif  /* KSSL_DEBUG */
2049
2050                         authp = NULL;
2051 #ifdef KRB5SENDAUTH
2052                         if (KRB5SENDAUTH)  authp = &authenticator;
2053 #endif  /* KRB5SENDAUTH */
2054
2055                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2056                                 &kssl_err);
2057                         enc = kssl_map_enc(kssl_ctx->enctype);
2058                         if (enc == NULL)
2059                             goto err;
2060 #ifdef KSSL_DEBUG
2061                         {
2062                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2063                         if (krb5rc && kssl_err.text)
2064                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2065                         }
2066 #endif  /* KSSL_DEBUG */
2067
2068                         if (krb5rc)
2069                                 {
2070                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2071                                                 SSL_AD_HANDSHAKE_FAILURE);
2072                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2073                                                 kssl_err.reason);
2074                                 goto err;
2075                                 }
2076
2077                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2078                         **  in place of RFC 2712 KerberosWrapper, as in:
2079                         **
2080                         **  Send ticket (copy to *p, set n = length)
2081                         **  n = krb5_ap_req.length;
2082                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2083                         **  if (krb5_ap_req.data)
2084                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2085                         **
2086                         **  Now using real RFC 2712 KerberosWrapper
2087                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2088                         **  Note: 2712 "opaque" types are here replaced
2089                         **  with a 2-byte length followed by the value.
2090                         **  Example:
2091                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2092                         **  Where "xx xx" = length bytes.  Shown here with
2093                         **  optional authenticator omitted.
2094                         */
2095
2096                         /*  KerberosWrapper.Ticket              */
2097                         s2n(enc_ticket->length,p);
2098                         memcpy(p, enc_ticket->data, enc_ticket->length);
2099                         p+= enc_ticket->length;
2100                         n = enc_ticket->length + 2;
2101
2102                         /*  KerberosWrapper.Authenticator       */
2103                         if (authp  &&  authp->length)
2104                                 {
2105                                 s2n(authp->length,p);
2106                                 memcpy(p, authp->data, authp->length);
2107                                 p+= authp->length;
2108                                 n+= authp->length + 2;
2109
2110                                 free(authp->data);
2111                                 authp->data = NULL;
2112                                 authp->length = 0;
2113                                 }
2114                         else
2115                                 {
2116                                 s2n(0,p);/*  null authenticator length  */
2117                                 n+=2;
2118                                 }
2119
2120                             tmp_buf[0]=s->client_version>>8;
2121                             tmp_buf[1]=s->client_version&0xff;
2122                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2123                                 goto err;
2124
2125                         /*  20010420 VRS.  Tried it this way; failed.
2126                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2127                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2128                         **                              kssl_ctx->length);
2129                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2130                         */
2131
2132                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2133                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2134                                 kssl_ctx->key,iv);
2135                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2136                                 sizeof tmp_buf);
2137                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2138                         outl += padl;
2139                         if (outl > sizeof epms)
2140                                 {
2141                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2142                                 goto err;
2143                                 }
2144                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2145
2146                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2147                         s2n(outl,p);
2148                         memcpy(p, epms, outl);
2149                         p+=outl;
2150                         n+=outl + 2;
2151
2152                         s->session->master_key_length=
2153                                 s->method->ssl3_enc->generate_master_secret(s,
2154                                         s->session->master_key,
2155                                         tmp_buf, sizeof tmp_buf);
2156
2157                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2158                         OPENSSL_cleanse(epms, outl);
2159                         }
2160 #endif
2161 #ifndef OPENSSL_NO_DH
2162                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2163                         {
2164                         DH *dh_srvr,*dh_clnt;
2165
2166                         if (s->session->sess_cert == NULL)
2167                                 {
2168                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2169                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2170                                 goto err;
2171                                 }
2172
2173                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2174                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2175                         else
2176                                 {
2177                                 /* we get them from the cert */
2178                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2179                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2180                                 goto err;
2181                                 }
2182
2183                         /* generate a new random key */
2184                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2185                                 {
2186                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2187                                 goto err;
2188                                 }
2189                         if (!DH_generate_key(dh_clnt))
2190                                 {
2191                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2192                                 goto err;
2193                                 }
2194
2195                         /* use the 'p' output buffer for the DH key, but
2196                          * make sure to clear it out afterwards */
2197
2198                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2199
2200                         if (n <= 0)
2201                                 {
2202                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2203                                 goto err;
2204                                 }
2205
2206                         /* generate master key from the result */
2207                         s->session->master_key_length=
2208                                 s->method->ssl3_enc->generate_master_secret(s,
2209                                         s->session->master_key,p,n);
2210                         /* clean up */
2211                         memset(p,0,n);
2212
2213                         /* send off the data */
2214                         n=BN_num_bytes(dh_clnt->pub_key);
2215                         s2n(n,p);
2216                         BN_bn2bin(dh_clnt->pub_key,p);
2217                         n+=2;
2218
2219                         DH_free(dh_clnt);
2220
2221                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2222                         }
2223 #endif
2224
2225 #ifndef OPENSSL_NO_ECDH
2226                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2227                         {
2228                         const EC_GROUP *srvr_group = NULL;
2229                         EC_KEY *tkey;
2230                         int ecdh_clnt_cert = 0;
2231                         int field_size = 0;
2232
2233                         /* Did we send out the client's
2234                          * ECDH share for use in premaster
2235                          * computation as part of client certificate?
2236                          * If so, set ecdh_clnt_cert to 1.
2237                          */
2238                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2239                                 {
2240                                 /* XXX: For now, we do not support client
2241                                  * authentication using ECDH certificates.
2242                                  * To add such support, one needs to add
2243                                  * code that checks for appropriate
2244                                  * conditions and sets ecdh_clnt_cert to 1.
2245                                  * For example, the cert have an ECC
2246                                  * key on the same curve as the server's
2247                                  * and the key should be authorized for
2248                                  * key agreement.
2249                                  *
2250                                  * One also needs to add code in ssl3_connect
2251                                  * to skip sending the certificate verify
2252                                  * message.
2253                                  *
2254                                  * if ((s->cert->key->privatekey != NULL) &&
2255                                  *     (s->cert->key->privatekey->type ==
2256                                  *      EVP_PKEY_EC) && ...)
2257                                  * ecdh_clnt_cert = 1;
2258                                  */
2259                                 }
2260
2261                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2262                                 {
2263                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2264                                 }
2265                         else
2266                                 {
2267                                 /* Get the Server Public Key from Cert */
2268                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2269                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2270                                 if ((srvr_pub_pkey == NULL) ||
2271                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2272                                     (srvr_pub_pkey->pkey.ec == NULL))
2273                                         {
2274                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2275                                             ERR_R_INTERNAL_ERROR);
2276                                         goto err;
2277                                         }
2278
2279                                 tkey = srvr_pub_pkey->pkey.ec;
2280                                 }
2281
2282                         srvr_group   = EC_KEY_get0_group(tkey);
2283                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2284
2285                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2286                                 {
2287                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2288                                     ERR_R_INTERNAL_ERROR);
2289                                 goto err;
2290                                 }
2291
2292                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2293                                 {
2294                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2295                                 goto err;
2296                                 }
2297
2298                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2299                                 {
2300                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2301                                 goto err;
2302                                 }
2303                         if (ecdh_clnt_cert)
2304                                 {
2305                                 /* Reuse key info from our certificate
2306                                  * We only need our private key to perform
2307                                  * the ECDH computation.
2308                                  */
2309                                 const BIGNUM *priv_key;
2310                                 tkey = s->cert->key->privatekey->pkey.ec;
2311                                 priv_key = EC_KEY_get0_private_key(tkey);
2312                                 if (priv_key == NULL)
2313                                         {
2314                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2315                                         goto err;
2316                                         }
2317                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2318                                         {
2319                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2320                                         goto err;
2321                                         }
2322                                 }
2323                         else
2324                                 {
2325                                 /* Generate a new ECDH key pair */
2326                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2327                                         {
2328                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2329                                         goto err;
2330                                         }
2331                                 }
2332
2333                         /* use the 'p' output buffer for the ECDH key, but
2334                          * make sure to clear it out afterwards
2335                          */
2336
2337                         field_size = EC_GROUP_get_degree(srvr_group);
2338                         if (field_size <= 0)
2339                                 {
2340                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2341                                        ERR_R_ECDH_LIB);
2342                                 goto err;
2343                                 }
2344                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2345                         if (n <= 0)
2346                                 {
2347                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2348                                        ERR_R_ECDH_LIB);
2349                                 goto err;
2350                                 }
2351
2352                         /* generate master key from the result */
2353                         s->session->master_key_length = s->method->ssl3_enc \
2354                             -> generate_master_secret(s,
2355                                 s->session->master_key,
2356                                 p, n);
2357
2358                         memset(p, 0, n); /* clean up */
2359
2360                         if (ecdh_clnt_cert)
2361                                 {
2362                                 /* Send empty client key exch message */
2363                                 n = 0;
2364                                 }
2365                         else
2366                                 {
2367                                 /* First check the size of encoding and
2368                                  * allocate memory accordingly.
2369                                  */
2370                                 encoded_pt_len =
2371                                     EC_POINT_point2oct(srvr_group,
2372                                         EC_KEY_get0_public_key(clnt_ecdh),
2373                                         POINT_CONVERSION_UNCOMPRESSED,
2374                                         NULL, 0, NULL);
2375
2376                                 encodedPoint = (unsigned char *)
2377                                     OPENSSL_malloc(encoded_pt_len *
2378                                         sizeof(unsigned char));
2379                                 bn_ctx = BN_CTX_new();
2380                                 if ((encodedPoint == NULL) ||
2381                                     (bn_ctx == NULL))
2382                                         {
2383                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2384                                         goto err;
2385                                         }
2386
2387                                 /* Encode the public key */
2388                                 n = EC_POINT_point2oct(srvr_group,
2389                                     EC_KEY_get0_public_key(clnt_ecdh),
2390                                     POINT_CONVERSION_UNCOMPRESSED,
2391                                     encodedPoint, encoded_pt_len, bn_ctx);
2392
2393                                 *p = n; /* length of encoded point */
2394                                 /* Encoded point will be copied here */
2395                                 p += 1;
2396                                 /* copy the point */
2397                                 memcpy((unsigned char *)p, encodedPoint, n);
2398                                 /* increment n to account for length field */
2399                                 n += 1;
2400                                 }
2401
2402                         /* Free allocated memory */
2403                         BN_CTX_free(bn_ctx);
2404                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2405                         if (clnt_ecdh != NULL)
2406                                  EC_KEY_free(clnt_ecdh);
2407                         EVP_PKEY_free(srvr_pub_pkey);
2408                         }
2409 #endif /* !OPENSSL_NO_ECDH */
2410                 else if (alg_k & SSL_kGOST)
2411                         {
2412                         /* GOST key exchange message creation */
2413                         EVP_PKEY_CTX *pkey_ctx;
2414                         X509 *peer_cert;
2415                         size_t msglen;
2416                         unsigned int md_len;
2417                         int keytype;
2418                         unsigned char premaster_secret[32],shared_ukm[32];
2419                         EVP_MD_CTX *ukm_hash;
2420                         EVP_PKEY *pub_key;
2421
2422                         /* Get server sertificate PKEY and create ctx from it */
2423                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2424                         if (!peer_cert)
2425                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2426                         if (!peer_cert)         {
2427                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2428                                         goto err;
2429                                 }
2430
2431                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2432                         /* If we have send a certificate, and certificate key
2433
2434                          * parameters match those of server certificate, use
2435                          * certificate key for key exchange
2436                          */
2437
2438                          /* Otherwise, generate ephemeral key pair */
2439
2440                         EVP_PKEY_encrypt_init(pkey_ctx);
2441                           /* Generate session key */
2442                     RAND_bytes(premaster_secret,32);
2443                         /* If we have client certificate, use its secret as peer key */
2444                         if (s->cert->key->privatekey) {
2445                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <0) {
2446                                         /* If there was an error - just ignore it. Ephemeral key
2447                                         * would be used
2448                                         */
2449                                         ERR_clear_error();
2450                                 } else {
2451                                         /* Set flag "client cert key is used for key
2452                                          * exchange"*/
2453                                 }
2454                         }
2455                         /* Compute shared IV and store it in algorithm-specific
2456                          * context data */
2457                         ukm_hash = EVP_MD_CTX_create();
2458                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2459                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2460                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2461                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2462                         EVP_MD_CTX_destroy(ukm_hash);
2463                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2464                                 8,shared_ukm)<0) {
2465                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2466                                                 SSL_R_LIBRARY_BUG);
2467                                         goto err;
2468                                 }
2469                         /* Make GOST keytransport blob message */
2470                         /*Encapsulate it into sequence */
2471                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2472                         *(p++)=0x81;
2473                         msglen=256;
2474                         if (EVP_PKEY_encrypt(pkey_ctx,(unsigned char *)p+1,&msglen,premaster_secret,32)<0) {
2475                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2476                                         SSL_R_LIBRARY_BUG);
2477                                 goto err;
2478                         }
2479                         *(p++)= msglen & 0xff;
2480                         n=msglen+3;
2481                         EVP_PKEY_CTX_free(pkey_ctx);
2482                         s->session->master_key_length=
2483                                 s->method->ssl3_enc->generate_master_secret(s,
2484                                         s->session->master_key,premaster_secret,32);
2485                         EVP_PKEY_free(pub_key);
2486
2487                         }
2488 #ifndef OPENSSL_NO_PSK
2489                 else if (alg_k & SSL_kPSK)
2490                         {
2491                         char identity[PSK_MAX_IDENTITY_LEN];
2492                         unsigned char *t = NULL;
2493                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2494                         unsigned int pre_ms_len = 0, psk_len = 0;
2495                         int psk_err = 1;
2496
2497                         n = 0;
2498                         if (s->psk_client_callback == NULL)
2499                                 {
2500                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2501                                         SSL_R_PSK_NO_CLIENT_CB);
2502                                 goto err;
2503                                 }
2504
2505                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2506                                 identity, PSK_MAX_IDENTITY_LEN,
2507                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2508                         if (psk_len > PSK_MAX_PSK_LEN)
2509                                 {
2510                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2511                                         ERR_R_INTERNAL_ERROR);
2512                                 goto psk_err;
2513                                 }
2514                         else if (psk_len == 0)
2515                                 {
2516                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2517                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2518                                 goto psk_err;
2519                                 }
2520
2521                         /* create PSK pre_master_secret */
2522                         pre_ms_len = 2+psk_len+2+psk_len;
2523                         t = psk_or_pre_ms;
2524                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2525                         s2n(psk_len, t);
2526                         memset(t, 0, psk_len);
2527                         t+=psk_len;
2528                         s2n(psk_len, t);
2529
2530                         if (s->session->psk_identity_hint != NULL)
2531                                 OPENSSL_free(s->session->psk_identity_hint);
2532                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2533                         if (s->ctx->psk_identity_hint != NULL &&
2534                                 s->session->psk_identity_hint == NULL)
2535                                 {
2536                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2537                                         ERR_R_MALLOC_FAILURE);
2538                                 goto psk_err;
2539                                 }
2540
2541                         if (s->session->psk_identity != NULL)
2542                                 OPENSSL_free(s->session->psk_identity);
2543                         s->session->psk_identity = BUF_strdup(identity);
2544                         if (s->session->psk_identity == NULL)
2545                                 {
2546                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2547                                         ERR_R_MALLOC_FAILURE);
2548                                 goto psk_err;
2549                                 }
2550
2551                         s->session->master_key_length =
2552                                 s->method->ssl3_enc->generate_master_secret(s,
2553                                         s->session->master_key,
2554                                         psk_or_pre_ms, pre_ms_len);
2555                         n = strlen(identity);
2556                         s2n(n, p);
2557                         memcpy(p, identity, n);
2558                         n+=2;
2559                         psk_err = 0;
2560                 psk_err:
2561                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2562                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2563                         if (psk_err != 0)
2564                                 {
2565                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2566                                 goto err;
2567                                 }
2568                         }
2569 #endif
2570                 else
2571                         {
2572                         ssl3_send_alert(s, SSL3_AL_FATAL,
2573                             SSL_AD_HANDSHAKE_FAILURE);
2574                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2575                             ERR_R_INTERNAL_ERROR);
2576                         goto err;
2577                         }
2578
2579                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2580                 l2n3(n,d);
2581
2582                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2583                 /* number of bytes to write */
2584                 s->init_num=n+4;
2585                 s->init_off=0;
2586                 }
2587
2588         /* SSL3_ST_CW_KEY_EXCH_B */
2589         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2590 err:
2591 #ifndef OPENSSL_NO_ECDH
2592         BN_CTX_free(bn_ctx);
2593         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2594         if (clnt_ecdh != NULL)
2595                 EC_KEY_free(clnt_ecdh);
2596         EVP_PKEY_free(srvr_pub_pkey);
2597 #endif
2598         return(-1);
2599         }
2600
2601 int ssl3_send_client_verify(SSL *s)
2602         {
2603         unsigned char *p,*d;
2604         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2605         EVP_PKEY *pkey;
2606         EVP_PKEY_CTX *pctx=NULL;
2607 #ifndef OPENSSL_NO_RSA
2608         unsigned u=0;
2609 #endif
2610         unsigned long n;
2611 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2612         int j;
2613 #endif
2614
2615         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2616                 {
2617                 d=(unsigned char *)s->init_buf->data;
2618                 p= &(d[4]);
2619                 pkey=s->cert->key->privatekey;
2620 /* Create context from key and test if sha1 is allowed as digest */
2621                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2622                 EVP_PKEY_sign_init(pctx);
2623                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2624                         {
2625                         s->method->ssl3_enc->cert_verify_mac(s,
2626                                                 NID_sha1,
2627                                                 &(data[MD5_DIGEST_LENGTH]));
2628                         }
2629                 else
2630                         {
2631                         ERR_clear_error();
2632                         }
2633 #ifndef OPENSSL_NO_RSA
2634                 if (pkey->type == EVP_PKEY_RSA)
2635                         {
2636                         s->method->ssl3_enc->cert_verify_mac(s,
2637                                 NID_md5,
2638                                 &(data[0]));
2639                         if (RSA_sign(NID_md5_sha1, data,
2640                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2641                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2642                                 {
2643                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2644                                 goto err;
2645                                 }
2646                         s2n(u,p);
2647                         n=u+2;
2648                         }
2649                 else
2650 #endif
2651 #ifndef OPENSSL_NO_DSA
2652                         if (pkey->type == EVP_PKEY_DSA)
2653                         {
2654                         if (!DSA_sign(pkey->save_type,
2655                                 &(data[MD5_DIGEST_LENGTH]),
2656                                 SHA_DIGEST_LENGTH,&(p[2]),
2657                                 (unsigned int *)&j,pkey->pkey.dsa))
2658                                 {
2659                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2660                                 goto err;
2661                                 }
2662                         s2n(j,p);
2663                         n=j+2;
2664                         }
2665                 else
2666 #endif
2667 #ifndef OPENSSL_NO_ECDSA
2668                         if (pkey->type == EVP_PKEY_EC)
2669                         {
2670                         if (!ECDSA_sign(pkey->save_type,
2671                                 &(data[MD5_DIGEST_LENGTH]),
2672                                 SHA_DIGEST_LENGTH,&(p[2]),
2673                                 (unsigned int *)&j,pkey->pkey.ec))
2674                                 {
2675                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2676                                     ERR_R_ECDSA_LIB);
2677                                 goto err;
2678                                 }
2679                         s2n(j,p);
2680                         n=j+2;
2681                         }
2682                 else
2683 #endif
2684                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2685                 {
2686                 unsigned char signbuf[64];
2687                 int i;
2688                 size_t sigsize=64;
2689                 s->method->ssl3_enc->cert_verify_mac(s,
2690                         NID_id_GostR3411_94,
2691                         data);
2692                 if (!EVP_PKEY_sign(pctx,signbuf,&sigsize,data,32)) {
2693                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2694                         ERR_R_INTERNAL_ERROR);
2695                         goto err;
2696                 }
2697                 for (i=63,j=0; i>=0; j++, i--) {
2698                         p[2+j]=signbuf[i];
2699                 }
2700                 s2n(j,p);
2701                 n=j+2;
2702                 }
2703                 else
2704                 {
2705                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2706                         goto err;
2707                 }
2708                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2709                 l2n3(n,d);
2710
2711                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2712                 s->init_num=(int)n+4;
2713                 s->init_off=0;
2714                 }
2715         EVP_PKEY_CTX_free(pctx);
2716         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2717 err:
2718         EVP_PKEY_CTX_free(pctx);
2719         return(-1);
2720         }
2721
2722 int ssl3_send_client_certificate(SSL *s)
2723         {
2724         X509 *x509=NULL;
2725         EVP_PKEY *pkey=NULL;
2726         int i;
2727         unsigned long l;
2728
2729         if (s->state == SSL3_ST_CW_CERT_A)
2730                 {
2731                 if ((s->cert == NULL) ||
2732                         (s->cert->key->x509 == NULL) ||
2733                         (s->cert->key->privatekey == NULL))
2734                         s->state=SSL3_ST_CW_CERT_B;
2735                 else
2736                         s->state=SSL3_ST_CW_CERT_C;
2737                 }
2738
2739         /* We need to get a client cert */
2740         if (s->state == SSL3_ST_CW_CERT_B)
2741                 {
2742                 /* If we get an error, we need to
2743                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2744                  * We then get retied later */
2745                 i=0;
2746                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2747                 if (i < 0)
2748                         {
2749                         s->rwstate=SSL_X509_LOOKUP;
2750                         return(-1);
2751                         }
2752                 s->rwstate=SSL_NOTHING;
2753                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2754                         {
2755                         s->state=SSL3_ST_CW_CERT_B;
2756                         if (    !SSL_use_certificate(s,x509) ||
2757                                 !SSL_use_PrivateKey(s,pkey))
2758                                 i=0;
2759                         }
2760                 else if (i == 1)
2761                         {
2762                         i=0;
2763                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2764                         }
2765
2766                 if (x509 != NULL) X509_free(x509);
2767                 if (pkey != NULL) EVP_PKEY_free(pkey);
2768                 if (i == 0)
2769                         {
2770                         if (s->version == SSL3_VERSION)
2771                                 {
2772                                 s->s3->tmp.cert_req=0;
2773                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2774                                 return(1);
2775                                 }
2776                         else
2777                                 {
2778                                 s->s3->tmp.cert_req=2;
2779                                 }
2780                         }
2781
2782                 /* Ok, we have a cert */
2783                 s->state=SSL3_ST_CW_CERT_C;
2784                 }
2785
2786         if (s->state == SSL3_ST_CW_CERT_C)
2787                 {
2788                 s->state=SSL3_ST_CW_CERT_D;
2789                 l=ssl3_output_cert_chain(s,
2790                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2791                 s->init_num=(int)l;
2792                 s->init_off=0;
2793                 }
2794         /* SSL3_ST_CW_CERT_D */
2795         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2796         }
2797
2798 #define has_bits(i,m)   (((i)&(m)) == (m))
2799
2800 int ssl3_check_cert_and_algorithm(SSL *s)
2801         {
2802         int i,idx;
2803         long alg_k,alg_a;
2804         EVP_PKEY *pkey=NULL;
2805         SESS_CERT *sc;
2806 #ifndef OPENSSL_NO_RSA
2807         RSA *rsa;
2808 #endif
2809 #ifndef OPENSSL_NO_DH
2810         DH *dh;
2811 #endif
2812
2813         sc=s->session->sess_cert;
2814         if (sc == NULL)
2815                 {
2816                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2817                 goto err;
2818                 }
2819
2820         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2821         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2822
2823         /* we don't have a certificate */
2824         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2825                 return(1);
2826
2827 #ifndef OPENSSL_NO_RSA
2828         rsa=s->session->sess_cert->peer_rsa_tmp;
2829 #endif
2830 #ifndef OPENSSL_NO_DH
2831         dh=s->session->sess_cert->peer_dh_tmp;
2832 #endif
2833
2834         /* This is the passed certificate */
2835
2836         idx=sc->peer_cert_type;
2837 #ifndef OPENSSL_NO_ECDH
2838         if (idx == SSL_PKEY_ECC)
2839                 {
2840                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2841                     s->s3->tmp.new_cipher) == 0)
2842                         { /* check failed */
2843                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2844                         goto f_err;
2845                         }
2846                 else
2847                         {
2848                         return 1;
2849                         }
2850                 }
2851 #endif
2852         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2853         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2854         EVP_PKEY_free(pkey);
2855
2856
2857         /* Check that we have a certificate if we require one */
2858         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2859                 {
2860                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2861                 goto f_err;
2862                 }
2863 #ifndef OPENSSL_NO_DSA
2864         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2865                 {
2866                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2867                 goto f_err;
2868                 }
2869 #endif
2870 #ifndef OPENSSL_NO_RSA
2871         if ((alg_k & SSL_kRSA) &&
2872                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2873                 {
2874                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2875                 goto f_err;
2876                 }
2877 #endif
2878 #ifndef OPENSSL_NO_DH
2879         if ((alg_k & SSL_kEDH) &&
2880                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2881                 {
2882                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2883                 goto f_err;
2884                 }
2885         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2886                 {
2887                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2888                 goto f_err;
2889                 }
2890 #ifndef OPENSSL_NO_DSA
2891         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2892                 {
2893                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2894                 goto f_err;
2895                 }
2896 #endif
2897 #endif
2898
2899         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2900                 {
2901 #ifndef OPENSSL_NO_RSA
2902                 if (alg_k & SSL_kRSA)
2903                         {
2904                         if (rsa == NULL
2905                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2906                                 {
2907                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2908                                 goto f_err;
2909                                 }
2910                         }
2911                 else
2912 #endif
2913 #ifndef OPENSSL_NO_DH
2914                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2915                             {
2916                             if (dh == NULL
2917                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2920                                 goto f_err;
2921                                 }
2922                         }
2923                 else
2924 #endif
2925                         {
2926                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2927                         goto f_err;
2928                         }
2929                 }
2930         return(1);
2931 f_err:
2932         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2933 err:
2934         return(0);
2935         }
2936
2937 /* Check to see if handshake is full or resumed. Usually this is just a
2938  * case of checking to see if a cache hit has occurred. In the case of
2939  * session tickets we have to check the next message to be sure.
2940  */
2941
2942 #ifndef OPENSSL_NO_TLSEXT
2943 static int ssl3_check_finished(SSL *s)
2944         {
2945         int ok;
2946         long n;
2947         /* If we have no ticket it cannot be a resumed session. */
2948         if (!s->session->tlsext_tick)
2949                 return 1;
2950         /* this function is called when we really expect a Certificate
2951          * message, so permit appropriate message length */
2952         n=s->method->ssl_get_message(s,
2953                 SSL3_ST_CR_CERT_A,
2954                 SSL3_ST_CR_CERT_B,
2955                 -1,
2956                 s->max_cert_list,
2957                 &ok);
2958         if (!ok) return((int)n);
2959         s->s3->tmp.reuse_message = 1;
2960         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2961                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2962                 return 2;
2963
2964         return 1;
2965         }
2966 #endif
2967
2968 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2969         {
2970         int i = 0;
2971 #ifndef OPENSSL_NO_ENGINE
2972         if (s->ctx->client_cert_engine)
2973                 {
2974                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2975                                                 SSL_get_client_CA_list(s),
2976                                                 px509, ppkey, NULL, NULL, NULL);
2977                 if (i != 0)
2978                         return i;
2979                 }
2980 #endif
2981         if (s->ctx->client_cert_cb)
2982                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2983         return i;
2984         }