ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver);
 168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         long num1;
 188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 189         int ret= -1;
 190         int new_state,state,skip=0;
 191
 192         RAND_add(&Time,sizeof(Time),0);
 193         ERR_clear_error();
 194         clear_sys_error();
 195
 196         if (s->info_callback != NULL)
 197                 cb=s->info_callback;
 198         else if (s->ctx->info_callback != NULL)
 199                 cb=s->ctx->info_callback;
 200
 201         s->in_handshake++;
 202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 203
 204         for (;;)
 205                 {
 206                 state=s->state;
 207
 208                 switch(s->state)
 209                         {
 210                 case SSL_ST_RENEGOTIATE:
 211                         s->new_session=1;
 212                         s->state=SSL_ST_CONNECT;
 213                         s->ctx->stats.sess_connect_renegotiate++;
 214                         /* break */
 215                 case SSL_ST_BEFORE:
 216                 case SSL_ST_CONNECT:
 217                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 218                 case SSL_ST_OK|SSL_ST_CONNECT:
 219
 220                         s->server=0;
 221                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 222
 223                         if ((s->version & 0xff00 ) != 0x0300)
 224                                 {
 225                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 226                                 ret = -1;
 227                                 goto end;
 228                                 }
 229
 230                         /* s->version=SSL3_VERSION; */
 231                         s->type=SSL_ST_CONNECT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 buf=NULL;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         ssl3_init_finished_mac(s);
 257
 258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 259                         s->ctx->stats.sess_connect++;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_CLNT_HELLO_A:
 264                 case SSL3_ST_CW_CLNT_HELLO_B:
 265
 266                         s->shutdown=0;
 267                         ret=ssl3_client_hello(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 270                         s->init_num=0;
 271
 272                         /* turn on buffering for the next lot of output */
 273                         if (s->bbio != s->wbio)
 274                                 s->wbio=BIO_push(s->bbio,s->wbio);
 275
 276                         break;
 277
 278                 case SSL3_ST_CR_SRVR_HELLO_A:
 279                 case SSL3_ST_CR_SRVR_HELLO_B:
 280                         ret=ssl3_get_server_hello(s);
 281                         if (ret <= 0) goto end;
 282
 283                         if (s->hit)
 284                                 s->state=SSL3_ST_CR_FINISHED_A;
 285                         else
 286                                 s->state=SSL3_ST_CR_CERT_A;
 287                         s->init_num=0;
 288                         break;
 289
 290                 case SSL3_ST_CR_CERT_A:
 291                 case SSL3_ST_CR_CERT_B:
 292 #ifndef OPENSSL_NO_TLSEXT
 293                         ret=ssl3_check_finished(s);
 294                         if (ret <= 0) goto end;
 295                         if (ret == 2)
 296                                 {
 297                                 s->hit = 1;
 298                                 if (s->tlsext_ticket_expected)
 299                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 300                                 else
 301                                         s->state=SSL3_ST_CR_FINISHED_A;
 302                                 s->init_num=0;
 303                                 break;
 304                                 }
 305 #endif
 306                         /* Check if it is anon DH/ECDH */
 307                         /* or PSK */
 308                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 309                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 310                                 {
 311                                 ret=ssl3_get_server_certificate(s);
 312                                 if (ret <= 0) goto end;
 313 #ifndef OPENSSL_NO_TLSEXT
 314                                 if (s->tlsext_status_expected)
 315                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 316                                 else
 317                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 318                                 }
 319                         else
 320                                 {
 321                                 skip = 1;
 322                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 323                                 }
 324 #else
 325                                 }
 326                         else
 327                                 skip=1;
 328
 329                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 330 #endif
 331                         s->init_num=0;
 332                         break;
 333
 334                 case SSL3_ST_CR_KEY_EXCH_A:
 335                 case SSL3_ST_CR_KEY_EXCH_B:
 336                         ret=ssl3_get_key_exchange(s);
 337                         if (ret <= 0) goto end;
 338                         s->state=SSL3_ST_CR_CERT_REQ_A;
 339                         s->init_num=0;
 340
 341                         /* at this point we check that we have the
 342                          * required stuff from the server */
 343                         if (!ssl3_check_cert_and_algorithm(s))
 344                                 {
 345                                 ret= -1;
 346                                 goto end;
 347                                 }
 348                         break;
 349
 350                 case SSL3_ST_CR_CERT_REQ_A:
 351                 case SSL3_ST_CR_CERT_REQ_B:
 352                         ret=ssl3_get_certificate_request(s);
 353                         if (ret <= 0) goto end;
 354                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 355                         s->init_num=0;
 356                         break;
 357
 358                 case SSL3_ST_CR_SRVR_DONE_A:
 359                 case SSL3_ST_CR_SRVR_DONE_B:
 360                         ret=ssl3_get_server_done(s);
 361                         if (ret <= 0) goto end;
 362                         if (s->s3->tmp.cert_req)
 363                                 s->state=SSL3_ST_CW_CERT_A;
 364                         else
 365                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 366                         s->init_num=0;
 367
 368                         break;
 369
 370                 case SSL3_ST_CW_CERT_A:
 371                 case SSL3_ST_CW_CERT_B:
 372                 case SSL3_ST_CW_CERT_C:
 373                 case SSL3_ST_CW_CERT_D:
 374                         ret=ssl3_send_client_certificate(s);
 375                         if (ret <= 0) goto end;
 376                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 377                         s->init_num=0;
 378                         break;
 379
 380                 case SSL3_ST_CW_KEY_EXCH_A:
 381                 case SSL3_ST_CW_KEY_EXCH_B:
 382                         ret=ssl3_send_client_key_exchange(s);
 383                         if (ret <= 0) goto end;
 384                         /* EAY EAY EAY need to check for DH fix cert
 385                          * sent back */
 386                         /* For TLS, cert_req is set to 2, so a cert chain
 387                          * of nothing is sent, but no verify packet is sent */
 388                         /* XXX: For now, we do not support client
 389                          * authentication in ECDH cipher suites with
 390                          * ECDH (rather than ECDSA) certificates.
 391                          * We need to skip the certificate verify
 392                          * message when client's ECDH public key is sent
 393                          * inside the client certificate.
 394                          */
 395                         if (s->s3->tmp.cert_req == 1)
 396                                 {
 397                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 398                                 }
 399                         else
 400                                 {
 401                                 s->state=SSL3_ST_CW_CHANGE_A;
 402                                 s->s3->change_cipher_spec=0;
 403                                 }
 404                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 405                                 {
 406                                 s->state=SSL3_ST_CW_CHANGE_A;
 407                                 s->s3->change_cipher_spec=0;
 408                                 }
 409
 410                         s->init_num=0;
 411                         break;
 412
 413                 case SSL3_ST_CW_CERT_VRFY_A:
 414                 case SSL3_ST_CW_CERT_VRFY_B:
 415                         ret=ssl3_send_client_verify(s);
 416                         if (ret <= 0) goto end;
 417                         s->state=SSL3_ST_CW_CHANGE_A;
 418                         s->init_num=0;
 419                         s->s3->change_cipher_spec=0;
 420                         break;
 421
 422                 case SSL3_ST_CW_CHANGE_A:
 423                 case SSL3_ST_CW_CHANGE_B:
 424                         ret=ssl3_send_change_cipher_spec(s,
 425                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 426                         if (ret <= 0) goto end;
 427                         s->state=SSL3_ST_CW_FINISHED_A;
 428                         s->init_num=0;
 429
 430                         s->session->cipher=s->s3->tmp.new_cipher;
 431 #ifdef OPENSSL_NO_COMP
 432                         s->session->compress_meth=0;
 433 #else
 434                         if (s->s3->tmp.new_compression == NULL)
 435                                 s->session->compress_meth=0;
 436                         else
 437                                 s->session->compress_meth=
 438                                         s->s3->tmp.new_compression->id;
 439 #endif
 440                         if (!s->method->ssl3_enc->setup_key_block(s))
 441                                 {
 442                                 ret= -1;
 443                                 goto end;
 444                                 }
 445
 446                         if (!s->method->ssl3_enc->change_cipher_state(s,
 447                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 448                                 {
 449                                 ret= -1;
 450                                 goto end;
 451                                 }
 452
 453                         break;
 454
 455                 case SSL3_ST_CW_FINISHED_A:
 456                 case SSL3_ST_CW_FINISHED_B:
 457                         ret=ssl3_send_finished(s,
 458                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 459                                 s->method->ssl3_enc->client_finished_label,
 460                                 s->method->ssl3_enc->client_finished_label_len);
 461                         if (ret <= 0) goto end;
 462                         s->state=SSL3_ST_CW_FLUSH;
 463
 464                         /* clear flags */
 465                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 466                         if (s->hit)
 467                                 {
 468                                 s->s3->tmp.next_state=SSL_ST_OK;
 469                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 470                                         {
 471                                         s->state=SSL_ST_OK;
 472                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 473                                         s->s3->delay_buf_pop_ret=0;
 474                                         }
 475                                 }
 476                         else
 477                                 {
 478 #ifndef OPENSSL_NO_TLSEXT
 479                                 /* Allow NewSessionTicket if ticket expected */
 480                                 if (s->tlsext_ticket_expected)
 481                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 482                                 else
 483 #endif
 484
 485                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 486                                 }
 487                         s->init_num=0;
 488                         break;
 489
 490 #ifndef OPENSSL_NO_TLSEXT
 491                 case SSL3_ST_CR_SESSION_TICKET_A:
 492                 case SSL3_ST_CR_SESSION_TICKET_B:
 493                         ret=ssl3_get_new_session_ticket(s);
 494                         if (ret <= 0) goto end;
 495                         s->state=SSL3_ST_CR_FINISHED_A;
 496                         s->init_num=0;
 497                 break;
 498
 499                 case SSL3_ST_CR_CERT_STATUS_A:
 500                 case SSL3_ST_CR_CERT_STATUS_B:
 501                         ret=ssl3_get_cert_status(s);
 502                         if (ret <= 0) goto end;
 503                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 504                         s->init_num=0;
 505                 break;
 506 #endif
 507
 508                 case SSL3_ST_CR_FINISHED_A:
 509                 case SSL3_ST_CR_FINISHED_B:
 510
 511                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 512                                 SSL3_ST_CR_FINISHED_B);
 513                         if (ret <= 0) goto end;
 514
 515                         if (s->hit)
 516                                 s->state=SSL3_ST_CW_CHANGE_A;
 517                         else
 518                                 s->state=SSL_ST_OK;
 519                         s->init_num=0;
 520                         break;
 521
 522                 case SSL3_ST_CW_FLUSH:
 523                         /* number of bytes to be flushed */
 524                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 525                         if (num1 > 0)
 526                                 {
 527                                 s->rwstate=SSL_WRITING;
 528                                 num1=BIO_flush(s->wbio);
 529                                 if (num1 <= 0) { ret= -1; goto end; }
 530                                 s->rwstate=SSL_NOTHING;
 531                                 }
 532
 533                         s->state=s->s3->tmp.next_state;
 534                         break;
 535
 536                 case SSL_ST_OK:
 537                         /* clean a few things up */
 538                         ssl3_cleanup_key_block(s);
 539
 540                         if (s->init_buf != NULL)
 541                                 {
 542                                 BUF_MEM_free(s->init_buf);
 543                                 s->init_buf=NULL;
 544                                 }
 545
 546                         /* If we are not 'joining' the last two packets,
 547                          * remove the buffering now */
 548                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 549                                 ssl_free_wbio_buffer(s);
 550                         /* else do it later in ssl3_write */
 551
 552                         s->init_num=0;
 553                         s->new_session=0;
 554
 555                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 556                         if (s->hit) s->ctx->stats.sess_hit++;
 557
 558                         ret=1;
 559                         /* s->server=0; */
 560                         s->handshake_func=ssl3_connect;
 561                         s->ctx->stats.sess_connect_good++;
 562
 563                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 564
 565                         goto end;
 566                         /* break; */
 567
 568                 default:
 569                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 570                         ret= -1;
 571                         goto end;
 572                         /* break; */
 573                         }
 574
 575                 /* did we do anything */
 576                 if (!s->s3->tmp.reuse_message && !skip)
 577                         {
 578                         if (s->debug)
 579                                 {
 580                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 581                                         goto end;
 582                                 }
 583
 584                         if ((cb != NULL) && (s->state != state))
 585                                 {
 586                                 new_state=s->state;
 587                                 s->state=state;
 588                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 589                                 s->state=new_state;
 590                                 }
 591                         }
 592                 skip=0;
 593                 }
 594 end:
 595         s->in_handshake--;
 596         if (buf != NULL)
 597                 BUF_MEM_free(buf);
 598         if (cb != NULL)
 599                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 600         return(ret);
 601         }
 602
 603
 604 int ssl3_client_hello(SSL *s)
 605         {
 606         unsigned char *buf;
 607         unsigned char *p,*d;
 608         int i;
 609         unsigned long Time,l;
 610 #ifndef OPENSSL_NO_COMP
 611         int j;
 612         SSL_COMP *comp;
 613 #endif
 614
 615         buf=(unsigned char *)s->init_buf->data;
 616         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 617                 {
 618                 SSL_SESSION *sess = s->session;
 619                 if ((sess == NULL) ||
 620                         (sess->ssl_version != s->version) ||
 621 #ifdef OPENSSL_NO_TLSEXT
 622                         !sess->session_id_length ||
 623 #else
 624                         (!sess->session_id_length && !sess->tlsext_tick) ||
 625 #endif
 626                         (sess->not_resumable))
 627                         {
 628                         if (!ssl_get_new_session(s,0))
 629                                 goto err;
 630                         }
 631                 /* else use the pre-loaded session */
 632
 633                 p=s->s3->client_random;
 634                 Time=(unsigned long)time(NULL);                 /* Time */
 635                 l2n(Time,p);
 636                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 637                         goto err;
 638
 639                 /* Do the message type and length last */
 640                 d=p= &(buf[4]);
 641
 642                 *(p++)=s->version>>8;
 643                 *(p++)=s->version&0xff;
 644                 s->client_version=s->version;
 645
 646                 /* Random stuff */
 647                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 648                 p+=SSL3_RANDOM_SIZE;
 649
 650                 /* Session ID */
 651                 if (s->new_session)
 652                         i=0;
 653                 else
 654                         i=s->session->session_id_length;
 655                 *(p++)=i;
 656                 if (i != 0)
 657                         {
 658                         if (i > (int)sizeof(s->session->session_id))
 659                                 {
 660                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 661                                 goto err;
 662                                 }
 663                         memcpy(p,s->session->session_id,i);
 664                         p+=i;
 665                         }
 666
 667                 /* Ciphers supported */
 668                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 669                 if (i == 0)
 670                         {
 671                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 672                         goto err;
 673                         }
 674                 s2n(i,p);
 675                 p+=i;
 676
 677                 /* COMPRESSION */
 678 #ifdef OPENSSL_NO_COMP
 679                 *(p++)=1;
 680 #else
 681
 682                 if ((s->options & SSL_OP_NO_COMPRESSION)
 683                                         || !s->ctx->comp_methods)
 684                         j=0;
 685                 else
 686                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 687                 *(p++)=1+j;
 688                 for (i=0; i<j; i++)
 689                         {
 690                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 691                         *(p++)=comp->id;
 692                         }
 693 #endif
 694                 *(p++)=0; /* Add the NULL method */
 695
 696 #ifndef OPENSSL_NO_TLSEXT
 697                 /* TLS extensions*/
 698                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 699                         {
 700                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 701                         goto err;
 702                         }
 703                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 704                         {
 705                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 706                         goto err;
 707                         }
 708 #endif
 709
 710                 l=(p-d);
 711                 d=buf;
 712                 *(d++)=SSL3_MT_CLIENT_HELLO;
 713                 l2n3(l,d);
 714
 715                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 716                 /* number of bytes to write */
 717                 s->init_num=p-buf;
 718                 s->init_off=0;
 719                 }
 720
 721         /* SSL3_ST_CW_CLNT_HELLO_B */
 722         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 723 err:
 724         return(-1);
 725         }
 726
 727 int ssl3_get_server_hello(SSL *s)
 728         {
 729         STACK_OF(SSL_CIPHER) *sk;
 730         const SSL_CIPHER *c;
 731         unsigned char *p,*d;
 732         int i,al,ok;
 733         unsigned int j;
 734         long n;
 735 #ifndef OPENSSL_NO_COMP
 736         SSL_COMP *comp;
 737 #endif
 738
 739         n=s->method->ssl_get_message(s,
 740                 SSL3_ST_CR_SRVR_HELLO_A,
 741                 SSL3_ST_CR_SRVR_HELLO_B,
 742                 -1,
 743                 20000, /* ?? */
 744                 &ok);
 745
 746         if (!ok) return((int)n);
 747
 748         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 749                 {
 750                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 751                         {
 752                         if ( s->d1->send_cookie == 0)
 753                                 {
 754                                 s->s3->tmp.reuse_message = 1;
 755                                 return 1;
 756                                 }
 757                         else /* already sent a cookie */
 758                                 {
 759                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 760                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 761                                 goto f_err;
 762                                 }
 763                         }
 764                 }
 765
 766         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 767                 {
 768                 al=SSL_AD_UNEXPECTED_MESSAGE;
 769                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 770                 goto f_err;
 771                 }
 772
 773         d=p=(unsigned char *)s->init_msg;
 774
 775         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 776                 {
 777                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 778                 s->version=(s->version&0xff00)|p[1];
 779                 al=SSL_AD_PROTOCOL_VERSION;
 780                 goto f_err;
 781                 }
 782         p+=2;
 783
 784         /* load the server hello data */
 785         /* load the server random */
 786         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 787         p+=SSL3_RANDOM_SIZE;
 788
 789         /* get the session-id */
 790         j= *(p++);
 791
 792         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 793                 {
 794                 al=SSL_AD_ILLEGAL_PARAMETER;
 795                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 796                 goto f_err;
 797                 }
 798
 799 #ifndef OPENSSL_NO_TLSEXT
 800         /* check if we want to resume the session based on external pre-shared secret */
 801         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 802                 {
 803                 SSL_CIPHER *pref_cipher=NULL;
 804                 s->session->master_key_length=sizeof(s->session->master_key);
 805                 if (s->tls_session_secret_cb(s, s->session->master_key,
 806                                              &s->session->master_key_length,
 807                                              NULL, &pref_cipher,
 808                                              s->tls_session_secret_cb_arg))
 809                         {
 810                         s->session->cipher = pref_cipher ?
 811                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 812                         }
 813                 }
 814 #endif /* OPENSSL_NO_TLSEXT */
 815
 816         if (j != 0 && j == s->session->session_id_length
 817             && memcmp(p,s->session->session_id,j) == 0)
 818             {
 819             if(s->sid_ctx_length != s->session->sid_ctx_length
 820                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 821                 {
 822                 /* actually a client application bug */
 823                 al=SSL_AD_ILLEGAL_PARAMETER;
 824                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 825                 goto f_err;
 826                 }
 827             s->hit=1;
 828             }
 829         else    /* a miss or crap from the other end */
 830                 {
 831                 /* If we were trying for session-id reuse, make a new
 832                  * SSL_SESSION so we don't stuff up other people */
 833                 s->hit=0;
 834                 if (s->session->session_id_length > 0)
 835                         {
 836                         if (!ssl_get_new_session(s,0))
 837                                 {
 838                                 al=SSL_AD_INTERNAL_ERROR;
 839                                 goto f_err;
 840                                 }
 841                         }
 842                 s->session->session_id_length=j;
 843                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 844                 }
 845         p+=j;
 846         c=ssl_get_cipher_by_char(s,p);
 847         if (c == NULL)
 848                 {
 849                 /* unknown cipher */
 850                 al=SSL_AD_ILLEGAL_PARAMETER;
 851                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 852                 goto f_err;
 853                 }
 854         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 855
 856         sk=ssl_get_ciphers_by_id(s);
 857         i=sk_SSL_CIPHER_find(sk,c);
 858         if (i < 0)
 859                 {
 860                 /* we did not say we would use this cipher */
 861                 al=SSL_AD_ILLEGAL_PARAMETER;
 862                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 863                 goto f_err;
 864                 }
 865
 866         /* Depending on the session caching (internal/external), the cipher
 867            and/or cipher_id values may not be set. Make sure that
 868            cipher_id is set and use it for comparison. */
 869         if (s->session->cipher)
 870                 s->session->cipher_id = s->session->cipher->id;
 871         if (s->hit && (s->session->cipher_id != c->id))
 872                 {
 873                 if (!(s->options &
 874                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 875                         {
 876                         al=SSL_AD_ILLEGAL_PARAMETER;
 877                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 878                         goto f_err;
 879                         }
 880                 }
 881         s->s3->tmp.new_cipher=c;
 882         if (!ssl3_digest_cached_records(s))
 883                 goto f_err;
 884
 885         /* lets get the compression algorithm */
 886         /* COMPRESSION */
 887 #ifdef OPENSSL_NO_COMP
 888         if (*(p++) != 0)
 889                 {
 890                 al=SSL_AD_ILLEGAL_PARAMETER;
 891                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 892                 goto f_err;
 893                 }
 894 #else
 895         j= *(p++);
 896         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 897                 comp=NULL;
 898         else
 899                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 900
 901         if ((j != 0) && (comp == NULL))
 902                 {
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 905                 goto f_err;
 906                 }
 907         else
 908                 {
 909                 s->s3->tmp.new_compression=comp;
 910                 }
 911 #endif
 912
 913 #ifndef OPENSSL_NO_TLSEXT
 914         /* TLS extensions*/
 915         if (s->version >= SSL3_VERSION)
 916                 {
 917                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 918                         {
 919                         /* 'al' set by ssl_parse_serverhello_tlsext */
 920                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 921                         goto f_err;
 922                         }
 923                 if (ssl_check_serverhello_tlsext(s) <= 0)
 924                         {
 925                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 926                                 goto err;
 927                         }
 928                 }
 929 #endif
 930
 931         if (p != (d+n))
 932                 {
 933                 /* wrong packet length */
 934                 al=SSL_AD_DECODE_ERROR;
 935                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 936                 goto err;
 937                 }
 938
 939         return(1);
 940 f_err:
 941         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 942 err:
 943         return(-1);
 944         }
 945
 946 int ssl3_get_server_certificate(SSL *s)
 947         {
 948         int al,i,ok,ret= -1;
 949         unsigned long n,nc,llen,l;
 950         X509 *x=NULL;
 951         const unsigned char *q,*p;
 952         unsigned char *d;
 953         STACK_OF(X509) *sk=NULL;
 954         SESS_CERT *sc;
 955         EVP_PKEY *pkey=NULL;
 956         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 957
 958         n=s->method->ssl_get_message(s,
 959                 SSL3_ST_CR_CERT_A,
 960                 SSL3_ST_CR_CERT_B,
 961                 -1,
 962                 s->max_cert_list,
 963                 &ok);
 964
 965         if (!ok) return((int)n);
 966
 967         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 968                 {
 969                 s->s3->tmp.reuse_message=1;
 970                 return(1);
 971                 }
 972
 973         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 974                 {
 975                 al=SSL_AD_UNEXPECTED_MESSAGE;
 976                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 977                 goto f_err;
 978                 }
 979         p=d=(unsigned char *)s->init_msg;
 980
 981         if ((sk=sk_X509_new_null()) == NULL)
 982                 {
 983                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 984                 goto err;
 985                 }
 986
 987         n2l3(p,llen);
 988         if (llen+3 != n)
 989                 {
 990                 al=SSL_AD_DECODE_ERROR;
 991                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 992                 goto f_err;
 993                 }
 994         for (nc=0; nc<llen; )
 995                 {
 996                 n2l3(p,l);
 997                 if ((l+nc+3) > llen)
 998                         {
 999                         al=SSL_AD_DECODE_ERROR;
1000                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1001                         goto f_err;
1002                         }
1003
1004                 q=p;
1005                 x=d2i_X509(NULL,&q,l);
1006                 if (x == NULL)
1007                         {
1008                         al=SSL_AD_BAD_CERTIFICATE;
1009                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1010                         goto f_err;
1011                         }
1012                 if (q != (p+l))
1013                         {
1014                         al=SSL_AD_DECODE_ERROR;
1015                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1016                         goto f_err;
1017                         }
1018                 if (!sk_X509_push(sk,x))
1019                         {
1020                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1021                         goto err;
1022                         }
1023                 x=NULL;
1024                 nc+=l+3;
1025                 p=q;
1026                 }
1027
1028         i=ssl_verify_cert_chain(s,sk);
1029         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1030 #ifndef OPENSSL_NO_KRB5
1031             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1032                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1033 #endif /* OPENSSL_NO_KRB5 */
1034                 )
1035                 {
1036                 al=ssl_verify_alarm_type(s->verify_result);
1037                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1038                 goto f_err;
1039                 }
1040         ERR_clear_error(); /* but we keep s->verify_result */
1041
1042         sc=ssl_sess_cert_new();
1043         if (sc == NULL) goto err;
1044
1045         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1046         s->session->sess_cert=sc;
1047
1048         sc->cert_chain=sk;
1049         /* Inconsistency alert: cert_chain does include the peer's
1050          * certificate, which we don't include in s3_srvr.c */
1051         x=sk_X509_value(sk,0);
1052         sk=NULL;
1053         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1054
1055         pkey=X509_get_pubkey(x);
1056
1057         /* VRS: allow null cert if auth == KRB5 */
1058         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1059                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1060                     ? 0 : 1;
1061
1062 #ifdef KSSL_DEBUG
1063         printf("pkey,x = %p, %p\n", pkey,x);
1064         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1065         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1066                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1067 #endif    /* KSSL_DEBUG */
1068
1069         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1070                 {
1071                 x=NULL;
1072                 al=SSL3_AL_FATAL;
1073                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1074                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1075                 goto f_err;
1076                 }
1077
1078         i=ssl_cert_type(x,pkey);
1079         if (need_cert && i < 0)
1080                 {
1081                 x=NULL;
1082                 al=SSL3_AL_FATAL;
1083                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1084                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1085                 goto f_err;
1086                 }
1087
1088         if (need_cert)
1089                 {
1090                 sc->peer_cert_type=i;
1091                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1092                 /* Why would the following ever happen?
1093                  * We just created sc a couple of lines ago. */
1094                 if (sc->peer_pkeys[i].x509 != NULL)
1095                         X509_free(sc->peer_pkeys[i].x509);
1096                 sc->peer_pkeys[i].x509=x;
1097                 sc->peer_key= &(sc->peer_pkeys[i]);
1098
1099                 if (s->session->peer != NULL)
1100                         X509_free(s->session->peer);
1101                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1102                 s->session->peer=x;
1103                 }
1104         else
1105                 {
1106                 sc->peer_cert_type=i;
1107                 sc->peer_key= NULL;
1108
1109                 if (s->session->peer != NULL)
1110                         X509_free(s->session->peer);
1111                 s->session->peer=NULL;
1112                 }
1113         s->session->verify_result = s->verify_result;
1114
1115         x=NULL;
1116         ret=1;
1117
1118         if (0)
1119                 {
1120 f_err:
1121                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1122                 }
1123 err:
1124         EVP_PKEY_free(pkey);
1125         X509_free(x);
1126         sk_X509_pop_free(sk,X509_free);
1127         return(ret);
1128         }
1129
1130 int ssl3_get_key_exchange(SSL *s)
1131         {
1132 #ifndef OPENSSL_NO_RSA
1133         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1134 #endif
1135         EVP_MD_CTX md_ctx;
1136         unsigned char *param,*p;
1137         int al,i,j,param_len,ok;
1138         long n,alg_k,alg_a;
1139         EVP_PKEY *pkey=NULL;
1140 #ifndef OPENSSL_NO_RSA
1141         RSA *rsa=NULL;
1142 #endif
1143 #ifndef OPENSSL_NO_DH
1144         DH *dh=NULL;
1145 #endif
1146 #ifndef OPENSSL_NO_ECDH
1147         EC_KEY *ecdh = NULL;
1148         BN_CTX *bn_ctx = NULL;
1149         EC_POINT *srvr_ecpoint = NULL;
1150         int curve_nid = 0;
1151         int encoded_pt_len = 0;
1152 #endif
1153
1154         /* use same message size as in ssl3_get_certificate_request()
1155          * as ServerKeyExchange message may be skipped */
1156         n=s->method->ssl_get_message(s,
1157                 SSL3_ST_CR_KEY_EXCH_A,
1158                 SSL3_ST_CR_KEY_EXCH_B,
1159                 -1,
1160                 s->max_cert_list,
1161                 &ok);
1162         if (!ok) return((int)n);
1163
1164         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1165                 {
1166 #ifndef OPENSSL_NO_PSK
1167                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1168                    omitted if no identity hint is sent. Set
1169                    session->sess_cert anyway to avoid problems
1170                    later.*/
1171                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1172                         {
1173                         s->session->sess_cert=ssl_sess_cert_new();
1174                         if (s->ctx->psk_identity_hint)
1175                                 OPENSSL_free(s->ctx->psk_identity_hint);
1176                         s->ctx->psk_identity_hint = NULL;
1177                         }
1178 #endif
1179                 s->s3->tmp.reuse_message=1;
1180                 return(1);
1181                 }
1182
1183         param=p=(unsigned char *)s->init_msg;
1184         if (s->session->sess_cert != NULL)
1185                 {
1186 #ifndef OPENSSL_NO_RSA
1187                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1188                         {
1189                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1190                         s->session->sess_cert->peer_rsa_tmp=NULL;
1191                         }
1192 #endif
1193 #ifndef OPENSSL_NO_DH
1194                 if (s->session->sess_cert->peer_dh_tmp)
1195                         {
1196                         DH_free(s->session->sess_cert->peer_dh_tmp);
1197                         s->session->sess_cert->peer_dh_tmp=NULL;
1198                         }
1199 #endif
1200 #ifndef OPENSSL_NO_ECDH
1201                 if (s->session->sess_cert->peer_ecdh_tmp)
1202                         {
1203                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1204                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1205                         }
1206 #endif
1207                 }
1208         else
1209                 {
1210                 s->session->sess_cert=ssl_sess_cert_new();
1211                 }
1212
1213         param_len=0;
1214         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1215         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1216         EVP_MD_CTX_init(&md_ctx);
1217
1218 #ifndef OPENSSL_NO_PSK
1219         if (alg_k & SSL_kPSK)
1220                 {
1221                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1222
1223                 al=SSL_AD_HANDSHAKE_FAILURE;
1224                 n2s(p,i);
1225                 param_len=i+2;
1226                 /* Store PSK identity hint for later use, hint is used
1227                  * in ssl3_send_client_key_exchange.  Assume that the
1228                  * maximum length of a PSK identity hint can be as
1229                  * long as the maximum length of a PSK identity. */
1230                 if (i > PSK_MAX_IDENTITY_LEN)
1231                         {
1232                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1233                                 SSL_R_DATA_LENGTH_TOO_LONG);
1234                         goto f_err;
1235                         }
1236                 if (param_len > n)
1237                         {
1238                         al=SSL_AD_DECODE_ERROR;
1239                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1240                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1241                         goto f_err;
1242                         }
1243                 /* If received PSK identity hint contains NULL
1244                  * characters, the hint is truncated from the first
1245                  * NULL. p may not be ending with NULL, so create a
1246                  * NULL-terminated string. */
1247                 memcpy(tmp_id_hint, p, i);
1248                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1249                 if (s->ctx->psk_identity_hint != NULL)
1250                         OPENSSL_free(s->ctx->psk_identity_hint);
1251                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1252                 if (s->ctx->psk_identity_hint == NULL)
1253                         {
1254                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1255                         goto f_err;
1256                         }
1257
1258                 p+=i;
1259                 n-=param_len;
1260                 }
1261         else
1262 #endif /* !OPENSSL_NO_PSK */
1263 #ifndef OPENSSL_NO_RSA
1264         if (alg_k & SSL_kRSA)
1265                 {
1266                 if ((rsa=RSA_new()) == NULL)
1267                         {
1268                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1269                         goto err;
1270                         }
1271                 n2s(p,i);
1272                 param_len=i+2;
1273                 if (param_len > n)
1274                         {
1275                         al=SSL_AD_DECODE_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1277                         goto f_err;
1278                         }
1279                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1280                         {
1281                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1282                         goto err;
1283                         }
1284                 p+=i;
1285
1286                 n2s(p,i);
1287                 param_len+=i+2;
1288                 if (param_len > n)
1289                         {
1290                         al=SSL_AD_DECODE_ERROR;
1291                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1292                         goto f_err;
1293                         }
1294                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1295                         {
1296                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1297                         goto err;
1298                         }
1299                 p+=i;
1300                 n-=param_len;
1301
1302                 /* this should be because we are using an export cipher */
1303                 if (alg_a & SSL_aRSA)
1304                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1305                 else
1306                         {
1307                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1308                         goto err;
1309                         }
1310                 s->session->sess_cert->peer_rsa_tmp=rsa;
1311                 rsa=NULL;
1312                 }
1313 #else /* OPENSSL_NO_RSA */
1314         if (0)
1315                 ;
1316 #endif
1317 #ifndef OPENSSL_NO_DH
1318         else if (alg_k & SSL_kEDH)
1319                 {
1320                 if ((dh=DH_new()) == NULL)
1321                         {
1322                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1323                         goto err;
1324                         }
1325                 n2s(p,i);
1326                 param_len=i+2;
1327                 if (param_len > n)
1328                         {
1329                         al=SSL_AD_DECODE_ERROR;
1330                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1331                         goto f_err;
1332                         }
1333                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1334                         {
1335                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1336                         goto err;
1337                         }
1338                 p+=i;
1339
1340                 n2s(p,i);
1341                 param_len+=i+2;
1342                 if (param_len > n)
1343                         {
1344                         al=SSL_AD_DECODE_ERROR;
1345                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1346                         goto f_err;
1347                         }
1348                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1349                         {
1350                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1351                         goto err;
1352                         }
1353                 p+=i;
1354
1355                 n2s(p,i);
1356                 param_len+=i+2;
1357                 if (param_len > n)
1358                         {
1359                         al=SSL_AD_DECODE_ERROR;
1360                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1361                         goto f_err;
1362                         }
1363                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1364                         {
1365                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1366                         goto err;
1367                         }
1368                 p+=i;
1369                 n-=param_len;
1370
1371 #ifndef OPENSSL_NO_RSA
1372                 if (alg_a & SSL_aRSA)
1373                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1374 #else
1375                 if (0)
1376                         ;
1377 #endif
1378 #ifndef OPENSSL_NO_DSA
1379                 else if (alg_a & SSL_aDSS)
1380                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1381 #endif
1382                 /* else anonymous DH, so no certificate or pkey. */
1383
1384                 s->session->sess_cert->peer_dh_tmp=dh;
1385                 dh=NULL;
1386                 }
1387         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1388                 {
1389                 al=SSL_AD_ILLEGAL_PARAMETER;
1390                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1391                 goto f_err;
1392                 }
1393 #endif /* !OPENSSL_NO_DH */
1394
1395 #ifndef OPENSSL_NO_ECDH
1396         else if (alg_k & SSL_kEECDH)
1397                 {
1398                 EC_GROUP *ngroup;
1399                 const EC_GROUP *group;
1400
1401                 if ((ecdh=EC_KEY_new()) == NULL)
1402                         {
1403                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1404                         goto err;
1405                         }
1406
1407                 /* Extract elliptic curve parameters and the
1408                  * server's ephemeral ECDH public key.
1409                  * Keep accumulating lengths of various components in
1410                  * param_len and make sure it never exceeds n.
1411                  */
1412
1413                 /* XXX: For now we only support named (not generic) curves
1414                  * and the ECParameters in this case is just three bytes.
1415                  */
1416                 param_len=3;
1417                 if ((param_len > n) ||
1418                     (*p != NAMED_CURVE_TYPE) ||
1419                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1420                         {
1421                         al=SSL_AD_INTERNAL_ERROR;
1422                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1423                         goto f_err;
1424                         }
1425
1426                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1427                 if (ngroup == NULL)
1428                         {
1429                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1430                         goto err;
1431                         }
1432                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1433                         {
1434                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1435                         goto err;
1436                         }
1437                 EC_GROUP_free(ngroup);
1438
1439                 group = EC_KEY_get0_group(ecdh);
1440
1441                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1442                     (EC_GROUP_get_degree(group) > 163))
1443                         {
1444                         al=SSL_AD_EXPORT_RESTRICTION;
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1446                         goto f_err;
1447                         }
1448
1449                 p+=3;
1450
1451                 /* Next, get the encoded ECPoint */
1452                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1453                     ((bn_ctx = BN_CTX_new()) == NULL))
1454                         {
1455                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1456                         goto err;
1457                         }
1458
1459                 encoded_pt_len = *p;  /* length of encoded point */
1460                 p+=1;
1461                 param_len += (1 + encoded_pt_len);
1462                 if ((param_len > n) ||
1463                     (EC_POINT_oct2point(group, srvr_ecpoint,
1464                         p, encoded_pt_len, bn_ctx) == 0))
1465                         {
1466                         al=SSL_AD_DECODE_ERROR;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1468                         goto f_err;
1469                         }
1470
1471                 n-=param_len;
1472                 p+=encoded_pt_len;
1473
1474                 /* The ECC/TLS specification does not mention
1475                  * the use of DSA to sign ECParameters in the server
1476                  * key exchange message. We do support RSA and ECDSA.
1477                  */
1478                 if (0) ;
1479 #ifndef OPENSSL_NO_RSA
1480                 else if (alg_a & SSL_aRSA)
1481                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1482 #endif
1483 #ifndef OPENSSL_NO_ECDSA
1484                 else if (alg_a & SSL_aECDSA)
1485                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1486 #endif
1487                 /* else anonymous ECDH, so no certificate or pkey. */
1488                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1489                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1490                 ecdh=NULL;
1491                 BN_CTX_free(bn_ctx);
1492                 EC_POINT_free(srvr_ecpoint);
1493                 srvr_ecpoint = NULL;
1494                 }
1495         else if (alg_k)
1496                 {
1497                 al=SSL_AD_UNEXPECTED_MESSAGE;
1498                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1499                 goto f_err;
1500                 }
1501 #endif /* !OPENSSL_NO_ECDH */
1502
1503
1504         /* p points to the next byte, there are 'n' bytes left */
1505
1506         /* if it was signed, check the signature */
1507         if (pkey != NULL)
1508                 {
1509                 n2s(p,i);
1510                 n-=2;
1511                 j=EVP_PKEY_size(pkey);
1512
1513                 if ((i != n) || (n > j) || (n <= 0))
1514                         {
1515                         /* wrong packet length */
1516                         al=SSL_AD_DECODE_ERROR;
1517                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1518                         goto f_err;
1519                         }
1520
1521 #ifndef OPENSSL_NO_RSA
1522                 if (pkey->type == EVP_PKEY_RSA)
1523                         {
1524                         int num;
1525
1526                         j=0;
1527                         q=md_buf;
1528                         for (num=2; num > 0; num--)
1529                                 {
1530                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1531                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1532                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1533                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1534                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1535                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1536                                 q+=i;
1537                                 j+=i;
1538                                 }
1539                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1540                                                                 pkey->pkey.rsa);
1541                         if (i < 0)
1542                                 {
1543                                 al=SSL_AD_DECRYPT_ERROR;
1544                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1545                                 goto f_err;
1546                                 }
1547                         if (i == 0)
1548                                 {
1549                                 /* bad signature */
1550                                 al=SSL_AD_DECRYPT_ERROR;
1551                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1552                                 goto f_err;
1553                                 }
1554                         }
1555                 else
1556 #endif
1557 #ifndef OPENSSL_NO_DSA
1558                         if (pkey->type == EVP_PKEY_DSA)
1559                         {
1560                         /* lets do DSS */
1561                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1562                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1563                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1564                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1565                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1566                                 {
1567                                 /* bad signature */
1568                                 al=SSL_AD_DECRYPT_ERROR;
1569                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1570                                 goto f_err;
1571                                 }
1572                         }
1573                 else
1574 #endif
1575 #ifndef OPENSSL_NO_ECDSA
1576                         if (pkey->type == EVP_PKEY_EC)
1577                         {
1578                         /* let's do ECDSA */
1579                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1580                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1581                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1582                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1583                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1584                                 {
1585                                 /* bad signature */
1586                                 al=SSL_AD_DECRYPT_ERROR;
1587                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1588                                 goto f_err;
1589                                 }
1590                         }
1591                 else
1592 #endif
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1595                         goto err;
1596                         }
1597                 }
1598         else
1599                 {
1600                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1601                         /* aNULL or kPSK do not need public keys */
1602                         {
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1604                         goto err;
1605                         }
1606                 /* still data left over */
1607                 if (n != 0)
1608                         {
1609                         al=SSL_AD_DECODE_ERROR;
1610                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1611                         goto f_err;
1612                         }
1613                 }
1614         EVP_PKEY_free(pkey);
1615         EVP_MD_CTX_cleanup(&md_ctx);
1616         return(1);
1617 f_err:
1618         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1619 err:
1620         EVP_PKEY_free(pkey);
1621 #ifndef OPENSSL_NO_RSA
1622         if (rsa != NULL)
1623                 RSA_free(rsa);
1624 #endif
1625 #ifndef OPENSSL_NO_DH
1626         if (dh != NULL)
1627                 DH_free(dh);
1628 #endif
1629 #ifndef OPENSSL_NO_ECDH
1630         BN_CTX_free(bn_ctx);
1631         EC_POINT_free(srvr_ecpoint);
1632         if (ecdh != NULL)
1633                 EC_KEY_free(ecdh);
1634 #endif
1635         EVP_MD_CTX_cleanup(&md_ctx);
1636         return(-1);
1637         }
1638
1639 int ssl3_get_certificate_request(SSL *s)
1640         {
1641         int ok,ret=0;
1642         unsigned long n,nc,l;
1643         unsigned int llen,ctype_num,i;
1644         X509_NAME *xn=NULL;
1645         const unsigned char *p,*q;
1646         unsigned char *d;
1647         STACK_OF(X509_NAME) *ca_sk=NULL;
1648
1649         n=s->method->ssl_get_message(s,
1650                 SSL3_ST_CR_CERT_REQ_A,
1651                 SSL3_ST_CR_CERT_REQ_B,
1652                 -1,
1653                 s->max_cert_list,
1654                 &ok);
1655
1656         if (!ok) return((int)n);
1657
1658         s->s3->tmp.cert_req=0;
1659
1660         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1661                 {
1662                 s->s3->tmp.reuse_message=1;
1663                 return(1);
1664                 }
1665
1666         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1667                 {
1668                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1669                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1670                 goto err;
1671                 }
1672
1673         /* TLS does not like anon-DH with client cert */
1674         if (s->version > SSL3_VERSION)
1675                 {
1676                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1677                         {
1678                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1679                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1680                         goto err;
1681                         }
1682                 }
1683
1684         p=d=(unsigned char *)s->init_msg;
1685
1686         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1687                 {
1688                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1689                 goto err;
1690                 }
1691
1692         /* get the certificate types */
1693         ctype_num= *(p++);
1694         if (ctype_num > SSL3_CT_NUMBER)
1695                 ctype_num=SSL3_CT_NUMBER;
1696         for (i=0; i<ctype_num; i++)
1697                 s->s3->tmp.ctype[i]= p[i];
1698         p+=ctype_num;
1699
1700         /* get the CA RDNs */
1701         n2s(p,llen);
1702 #if 0
1703 {
1704 FILE *out;
1705 out=fopen("/tmp/vsign.der","w");
1706 fwrite(p,1,llen,out);
1707 fclose(out);
1708 }
1709 #endif
1710
1711         if ((llen+ctype_num+2+1) != n)
1712                 {
1713                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1714                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1715                 goto err;
1716                 }
1717
1718         for (nc=0; nc<llen; )
1719                 {
1720                 n2s(p,l);
1721                 if ((l+nc+2) > llen)
1722                         {
1723                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1724                                 goto cont; /* netscape bugs */
1725                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1726                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1727                         goto err;
1728                         }
1729
1730                 q=p;
1731
1732                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1733                         {
1734                         /* If netscape tolerance is on, ignore errors */
1735                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1736                                 goto cont;
1737                         else
1738                                 {
1739                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1740                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1741                                 goto err;
1742                                 }
1743                         }
1744
1745                 if (q != (p+l))
1746                         {
1747                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1748                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1749                         goto err;
1750                         }
1751                 if (!sk_X509_NAME_push(ca_sk,xn))
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1754                         goto err;
1755                         }
1756
1757                 p+=l;
1758                 nc+=l+2;
1759                 }
1760
1761         if (0)
1762                 {
1763 cont:
1764                 ERR_clear_error();
1765                 }
1766
1767         /* we should setup a certificate to return.... */
1768         s->s3->tmp.cert_req=1;
1769         s->s3->tmp.ctype_num=ctype_num;
1770         if (s->s3->tmp.ca_names != NULL)
1771                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1772         s->s3->tmp.ca_names=ca_sk;
1773         ca_sk=NULL;
1774
1775         ret=1;
1776 err:
1777         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1778         return(ret);
1779         }
1780
1781 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1782         {
1783         return(X509_NAME_cmp(*a,*b));
1784         }
1785 #ifndef OPENSSL_NO_TLSEXT
1786 int ssl3_get_new_session_ticket(SSL *s)
1787         {
1788         int ok,al,ret=0, ticklen;
1789         long n;
1790         const unsigned char *p;
1791         unsigned char *d;
1792
1793         n=s->method->ssl_get_message(s,
1794                 SSL3_ST_CR_SESSION_TICKET_A,
1795                 SSL3_ST_CR_SESSION_TICKET_B,
1796                 -1,
1797                 16384,
1798                 &ok);
1799
1800         if (!ok)
1801                 return((int)n);
1802
1803         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1804                 {
1805                 s->s3->tmp.reuse_message=1;
1806                 return(1);
1807                 }
1808         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1809                 {
1810                 al=SSL_AD_UNEXPECTED_MESSAGE;
1811                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1812                 goto f_err;
1813                 }
1814         if (n < 6)
1815                 {
1816                 /* need at least ticket_lifetime_hint + ticket length */
1817                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1818                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1819                 goto f_err;
1820                 }
1821
1822         p=d=(unsigned char *)s->init_msg;
1823         n2l(p, s->session->tlsext_tick_lifetime_hint);
1824         n2s(p, ticklen);
1825         /* ticket_lifetime_hint + ticket_length + ticket */
1826         if (ticklen + 6 != n)
1827                 {
1828                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1829                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1830                 goto f_err;
1831                 }
1832         if (s->session->tlsext_tick)
1833                 {
1834                 OPENSSL_free(s->session->tlsext_tick);
1835                 s->session->tlsext_ticklen = 0;
1836                 }
1837         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1838         if (!s->session->tlsext_tick)
1839                 {
1840                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1841                 goto err;
1842                 }
1843         memcpy(s->session->tlsext_tick, p, ticklen);
1844         s->session->tlsext_ticklen = ticklen;
1845         /* There are two ways to detect a resumed ticket sesion.
1846          * One is to set an appropriate session ID and then the server
1847          * must return a match in ServerHello. This allows the normal
1848          * client session ID matching to work and we know much
1849          * earlier that the ticket has been accepted.
1850          *
1851          * The other way is to set zero length session ID when the
1852          * ticket is presented and rely on the handshake to determine
1853          * session resumption.
1854          *
1855          * We choose the former approach because this fits in with
1856          * assumptions elsewhere in OpenSSL. The session ID is set
1857          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1858          * ticket.
1859          */
1860         EVP_Digest(p, ticklen,
1861                         s->session->session_id, &s->session->session_id_length,
1862 #ifndef OPENSSL_NO_SHA256
1863                                                         EVP_sha256(), NULL);
1864 #else
1865                                                         EVP_sha1(), NULL);
1866 #endif
1867         ret=1;
1868         return(ret);
1869 f_err:
1870         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1871 err:
1872         return(-1);
1873         }
1874
1875 int ssl3_get_cert_status(SSL *s)
1876         {
1877         int ok, al;
1878         unsigned long resplen,n;
1879         const unsigned char *p;
1880
1881         n=s->method->ssl_get_message(s,
1882                 SSL3_ST_CR_CERT_STATUS_A,
1883                 SSL3_ST_CR_CERT_STATUS_B,
1884                 SSL3_MT_CERTIFICATE_STATUS,
1885                 16384,
1886                 &ok);
1887
1888         if (!ok) return((int)n);
1889         if (n < 4)
1890                 {
1891                 /* need at least status type + length */
1892                 al = SSL_AD_DECODE_ERROR;
1893                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1894                 goto f_err;
1895                 }
1896         p = (unsigned char *)s->init_msg;
1897         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1898                 {
1899                 al = SSL_AD_DECODE_ERROR;
1900                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1901                 goto f_err;
1902                 }
1903         n2l3(p, resplen);
1904         if (resplen + 4 != n)
1905                 {
1906                 al = SSL_AD_DECODE_ERROR;
1907                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1908                 goto f_err;
1909                 }
1910         if (s->tlsext_ocsp_resp)
1911                 OPENSSL_free(s->tlsext_ocsp_resp);
1912         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1913         if (!s->tlsext_ocsp_resp)
1914                 {
1915                 al = SSL_AD_INTERNAL_ERROR;
1916                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1917                 goto f_err;
1918                 }
1919         s->tlsext_ocsp_resplen = resplen;
1920         if (s->ctx->tlsext_status_cb)
1921                 {
1922                 int ret;
1923                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1924                 if (ret == 0)
1925                         {
1926                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1927                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1928                         goto f_err;
1929                         }
1930                 if (ret < 0)
1931                         {
1932                         al = SSL_AD_INTERNAL_ERROR;
1933                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1934                         goto f_err;
1935                         }
1936                 }
1937         return 1;
1938 f_err:
1939         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1940         return(-1);
1941         }
1942 #endif
1943
1944 int ssl3_get_server_done(SSL *s)
1945         {
1946         int ok,ret=0;
1947         long n;
1948
1949         n=s->method->ssl_get_message(s,
1950                 SSL3_ST_CR_SRVR_DONE_A,
1951                 SSL3_ST_CR_SRVR_DONE_B,
1952                 SSL3_MT_SERVER_DONE,
1953                 30, /* should be very small, like 0 :-) */
1954                 &ok);
1955
1956         if (!ok) return((int)n);
1957         if (n > 0)
1958                 {
1959                 /* should contain no data */
1960                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1961                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1962                 return -1;
1963                 }
1964         ret=1;
1965         return(ret);
1966         }
1967
1968
1969 int ssl3_send_client_key_exchange(SSL *s)
1970         {
1971         unsigned char *p,*d;
1972         int n;
1973         unsigned long alg_k;
1974 #ifndef OPENSSL_NO_RSA
1975         unsigned char *q;
1976         EVP_PKEY *pkey=NULL;
1977 #endif
1978 #ifndef OPENSSL_NO_KRB5
1979         KSSL_ERR kssl_err;
1980 #endif /* OPENSSL_NO_KRB5 */
1981 #ifndef OPENSSL_NO_ECDH
1982         EC_KEY *clnt_ecdh = NULL;
1983         const EC_POINT *srvr_ecpoint = NULL;
1984         EVP_PKEY *srvr_pub_pkey = NULL;
1985         unsigned char *encodedPoint = NULL;
1986         int encoded_pt_len = 0;
1987         BN_CTX * bn_ctx = NULL;
1988 #endif
1989
1990         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1991                 {
1992                 d=(unsigned char *)s->init_buf->data;
1993                 p= &(d[4]);
1994
1995                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1996
1997                 /* Fool emacs indentation */
1998                 if (0) {}
1999 #ifndef OPENSSL_NO_RSA
2000                 else if (alg_k & SSL_kRSA)
2001                         {
2002                         RSA *rsa;
2003                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2004
2005                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2006                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2007                         else
2008                                 {
2009                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2010                                 if ((pkey == NULL) ||
2011                                         (pkey->type != EVP_PKEY_RSA) ||
2012                                         (pkey->pkey.rsa == NULL))
2013                                         {
2014                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2015                                         goto err;
2016                                         }
2017                                 rsa=pkey->pkey.rsa;
2018                                 EVP_PKEY_free(pkey);
2019                                 }
2020
2021                         tmp_buf[0]=s->client_version>>8;
2022                         tmp_buf[1]=s->client_version&0xff;
2023                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2024                                         goto err;
2025
2026                         s->session->master_key_length=sizeof tmp_buf;
2027
2028                         q=p;
2029                         /* Fix buf for TLS and beyond */
2030                         if (s->version > SSL3_VERSION)
2031                                 p+=2;
2032                         n=RSA_public_encrypt(sizeof tmp_buf,
2033                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2034 #ifdef PKCS1_CHECK
2035                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2036                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2037 #endif
2038                         if (n <= 0)
2039                                 {
2040                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2041                                 goto err;
2042                                 }
2043
2044                         /* Fix buf for TLS and beyond */
2045                         if (s->version > SSL3_VERSION)
2046                                 {
2047                                 s2n(n,q);
2048                                 n+=2;
2049                                 }
2050
2051                         s->session->master_key_length=
2052                                 s->method->ssl3_enc->generate_master_secret(s,
2053                                         s->session->master_key,
2054                                         tmp_buf,sizeof tmp_buf);
2055                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2056                         }
2057 #endif
2058 #ifndef OPENSSL_NO_KRB5
2059                 else if (alg_k & SSL_kKRB5)
2060                         {
2061                         krb5_error_code krb5rc;
2062                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2063                         /*  krb5_data   krb5_ap_req;  */
2064                         krb5_data       *enc_ticket;
2065                         krb5_data       authenticator, *authp = NULL;
2066                         EVP_CIPHER_CTX  ciph_ctx;
2067                         const EVP_CIPHER *enc = NULL;
2068                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2069                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2070                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2071                                                 + EVP_MAX_IV_LENGTH];
2072                         int             padl, outl = sizeof(epms);
2073
2074                         EVP_CIPHER_CTX_init(&ciph_ctx);
2075
2076 #ifdef KSSL_DEBUG
2077                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2078                                 alg_k, SSL_kKRB5);
2079 #endif  /* KSSL_DEBUG */
2080
2081                         authp = NULL;
2082 #ifdef KRB5SENDAUTH
2083                         if (KRB5SENDAUTH)  authp = &authenticator;
2084 #endif  /* KRB5SENDAUTH */
2085
2086                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2087                                 &kssl_err);
2088                         enc = kssl_map_enc(kssl_ctx->enctype);
2089                         if (enc == NULL)
2090                             goto err;
2091 #ifdef KSSL_DEBUG
2092                         {
2093                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2094                         if (krb5rc && kssl_err.text)
2095                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2096                         }
2097 #endif  /* KSSL_DEBUG */
2098
2099                         if (krb5rc)
2100                                 {
2101                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2102                                                 SSL_AD_HANDSHAKE_FAILURE);
2103                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2104                                                 kssl_err.reason);
2105                                 goto err;
2106                                 }
2107
2108                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2109                         **  in place of RFC 2712 KerberosWrapper, as in:
2110                         **
2111                         **  Send ticket (copy to *p, set n = length)
2112                         **  n = krb5_ap_req.length;
2113                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2114                         **  if (krb5_ap_req.data)
2115                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2116                         **
2117                         **  Now using real RFC 2712 KerberosWrapper
2118                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2119                         **  Note: 2712 "opaque" types are here replaced
2120                         **  with a 2-byte length followed by the value.
2121                         **  Example:
2122                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2123                         **  Where "xx xx" = length bytes.  Shown here with
2124                         **  optional authenticator omitted.
2125                         */
2126
2127                         /*  KerberosWrapper.Ticket              */
2128                         s2n(enc_ticket->length,p);
2129                         memcpy(p, enc_ticket->data, enc_ticket->length);
2130                         p+= enc_ticket->length;
2131                         n = enc_ticket->length + 2;
2132
2133                         /*  KerberosWrapper.Authenticator       */
2134                         if (authp  &&  authp->length)
2135                                 {
2136                                 s2n(authp->length,p);
2137                                 memcpy(p, authp->data, authp->length);
2138                                 p+= authp->length;
2139                                 n+= authp->length + 2;
2140
2141                                 free(authp->data);
2142                                 authp->data = NULL;
2143                                 authp->length = 0;
2144                                 }
2145                         else
2146                                 {
2147                                 s2n(0,p);/*  null authenticator length  */
2148                                 n+=2;
2149                                 }
2150
2151                             tmp_buf[0]=s->client_version>>8;
2152                             tmp_buf[1]=s->client_version&0xff;
2153                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2154                                 goto err;
2155
2156                         /*  20010420 VRS.  Tried it this way; failed.
2157                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2158                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2159                         **                              kssl_ctx->length);
2160                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2161                         */
2162
2163                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2164                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2165                                 kssl_ctx->key,iv);
2166                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2167                                 sizeof tmp_buf);
2168                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2169                         outl += padl;
2170                         if (outl > (int)sizeof epms)
2171                                 {
2172                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2173                                 goto err;
2174                                 }
2175                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2176
2177                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2178                         s2n(outl,p);
2179                         memcpy(p, epms, outl);
2180                         p+=outl;
2181                         n+=outl + 2;
2182
2183                         s->session->master_key_length=
2184                                 s->method->ssl3_enc->generate_master_secret(s,
2185                                         s->session->master_key,
2186                                         tmp_buf, sizeof tmp_buf);
2187
2188                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2189                         OPENSSL_cleanse(epms, outl);
2190                         }
2191 #endif
2192 #ifndef OPENSSL_NO_DH
2193                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2194                         {
2195                         DH *dh_srvr,*dh_clnt;
2196
2197                         if (s->session->sess_cert == NULL)
2198                                 {
2199                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2200                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2201                                 goto err;
2202                                 }
2203
2204                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2205                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2206                         else
2207                                 {
2208                                 /* we get them from the cert */
2209                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2210                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2211                                 goto err;
2212                                 }
2213
2214                         /* generate a new random key */
2215                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2216                                 {
2217                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2218                                 goto err;
2219                                 }
2220                         if (!DH_generate_key(dh_clnt))
2221                                 {
2222                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2223                                 goto err;
2224                                 }
2225
2226                         /* use the 'p' output buffer for the DH key, but
2227                          * make sure to clear it out afterwards */
2228
2229                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2230
2231                         if (n <= 0)
2232                                 {
2233                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2234                                 goto err;
2235                                 }
2236
2237                         /* generate master key from the result */
2238                         s->session->master_key_length=
2239                                 s->method->ssl3_enc->generate_master_secret(s,
2240                                         s->session->master_key,p,n);
2241                         /* clean up */
2242                         memset(p,0,n);
2243
2244                         /* send off the data */
2245                         n=BN_num_bytes(dh_clnt->pub_key);
2246                         s2n(n,p);
2247                         BN_bn2bin(dh_clnt->pub_key,p);
2248                         n+=2;
2249
2250                         DH_free(dh_clnt);
2251
2252                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2253                         }
2254 #endif
2255
2256 #ifndef OPENSSL_NO_ECDH
2257                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2258                         {
2259                         const EC_GROUP *srvr_group = NULL;
2260                         EC_KEY *tkey;
2261                         int ecdh_clnt_cert = 0;
2262                         int field_size = 0;
2263
2264                         /* Did we send out the client's
2265                          * ECDH share for use in premaster
2266                          * computation as part of client certificate?
2267                          * If so, set ecdh_clnt_cert to 1.
2268                          */
2269                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2270                                 {
2271                                 /* XXX: For now, we do not support client
2272                                  * authentication using ECDH certificates.
2273                                  * To add such support, one needs to add
2274                                  * code that checks for appropriate
2275                                  * conditions and sets ecdh_clnt_cert to 1.
2276                                  * For example, the cert have an ECC
2277                                  * key on the same curve as the server's
2278                                  * and the key should be authorized for
2279                                  * key agreement.
2280                                  *
2281                                  * One also needs to add code in ssl3_connect
2282                                  * to skip sending the certificate verify
2283                                  * message.
2284                                  *
2285                                  * if ((s->cert->key->privatekey != NULL) &&
2286                                  *     (s->cert->key->privatekey->type ==
2287                                  *      EVP_PKEY_EC) && ...)
2288                                  * ecdh_clnt_cert = 1;
2289                                  */
2290                                 }
2291
2292                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2293                                 {
2294                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2295                                 }
2296                         else
2297                                 {
2298                                 /* Get the Server Public Key from Cert */
2299                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2300                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2301                                 if ((srvr_pub_pkey == NULL) ||
2302                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2303                                     (srvr_pub_pkey->pkey.ec == NULL))
2304                                         {
2305                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2306                                             ERR_R_INTERNAL_ERROR);
2307                                         goto err;
2308                                         }
2309
2310                                 tkey = srvr_pub_pkey->pkey.ec;
2311                                 }
2312
2313                         srvr_group   = EC_KEY_get0_group(tkey);
2314                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2315
2316                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2317                                 {
2318                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2319                                     ERR_R_INTERNAL_ERROR);
2320                                 goto err;
2321                                 }
2322
2323                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2324                                 {
2325                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2326                                 goto err;
2327                                 }
2328
2329                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2330                                 {
2331                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2332                                 goto err;
2333                                 }
2334                         if (ecdh_clnt_cert)
2335                                 {
2336                                 /* Reuse key info from our certificate
2337                                  * We only need our private key to perform
2338                                  * the ECDH computation.
2339                                  */
2340                                 const BIGNUM *priv_key;
2341                                 tkey = s->cert->key->privatekey->pkey.ec;
2342                                 priv_key = EC_KEY_get0_private_key(tkey);
2343                                 if (priv_key == NULL)
2344                                         {
2345                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2346                                         goto err;
2347                                         }
2348                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2349                                         {
2350                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2351                                         goto err;
2352                                         }
2353                                 }
2354                         else
2355                                 {
2356                                 /* Generate a new ECDH key pair */
2357                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2358                                         {
2359                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2360                                         goto err;
2361                                         }
2362                                 }
2363
2364                         /* use the 'p' output buffer for the ECDH key, but
2365                          * make sure to clear it out afterwards
2366                          */
2367
2368                         field_size = EC_GROUP_get_degree(srvr_group);
2369                         if (field_size <= 0)
2370                                 {
2371                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2372                                        ERR_R_ECDH_LIB);
2373                                 goto err;
2374                                 }
2375                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2376                         if (n <= 0)
2377                                 {
2378                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2379                                        ERR_R_ECDH_LIB);
2380                                 goto err;
2381                                 }
2382
2383                         /* generate master key from the result */
2384                         s->session->master_key_length = s->method->ssl3_enc \
2385                             -> generate_master_secret(s,
2386                                 s->session->master_key,
2387                                 p, n);
2388
2389                         memset(p, 0, n); /* clean up */
2390
2391                         if (ecdh_clnt_cert)
2392                                 {
2393                                 /* Send empty client key exch message */
2394                                 n = 0;
2395                                 }
2396                         else
2397                                 {
2398                                 /* First check the size of encoding and
2399                                  * allocate memory accordingly.
2400                                  */
2401                                 encoded_pt_len =
2402                                     EC_POINT_point2oct(srvr_group,
2403                                         EC_KEY_get0_public_key(clnt_ecdh),
2404                                         POINT_CONVERSION_UNCOMPRESSED,
2405                                         NULL, 0, NULL);
2406
2407                                 encodedPoint = (unsigned char *)
2408                                     OPENSSL_malloc(encoded_pt_len *
2409                                         sizeof(unsigned char));
2410                                 bn_ctx = BN_CTX_new();
2411                                 if ((encodedPoint == NULL) ||
2412                                     (bn_ctx == NULL))
2413                                         {
2414                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2415                                         goto err;
2416                                         }
2417
2418                                 /* Encode the public key */
2419                                 n = EC_POINT_point2oct(srvr_group,
2420                                     EC_KEY_get0_public_key(clnt_ecdh),
2421                                     POINT_CONVERSION_UNCOMPRESSED,
2422                                     encodedPoint, encoded_pt_len, bn_ctx);
2423
2424                                 *p = n; /* length of encoded point */
2425                                 /* Encoded point will be copied here */
2426                                 p += 1;
2427                                 /* copy the point */
2428                                 memcpy((unsigned char *)p, encodedPoint, n);
2429                                 /* increment n to account for length field */
2430                                 n += 1;
2431                                 }
2432
2433                         /* Free allocated memory */
2434                         BN_CTX_free(bn_ctx);
2435                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2436                         if (clnt_ecdh != NULL)
2437                                  EC_KEY_free(clnt_ecdh);
2438                         EVP_PKEY_free(srvr_pub_pkey);
2439                         }
2440 #endif /* !OPENSSL_NO_ECDH */
2441                 else if (alg_k & SSL_kGOST)
2442                         {
2443                         /* GOST key exchange message creation */
2444                         EVP_PKEY_CTX *pkey_ctx;
2445                         X509 *peer_cert;
2446                         size_t msglen;
2447                         unsigned int md_len;
2448                         int keytype;
2449                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2450                         EVP_MD_CTX *ukm_hash;
2451                         EVP_PKEY *pub_key;
2452
2453                         /* Get server sertificate PKEY and create ctx from it */
2454                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2455                         if (!peer_cert)
2456                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2457                         if (!peer_cert)         {
2458                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2459                                         goto err;
2460                                 }
2461
2462                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2463                         /* If we have send a certificate, and certificate key
2464
2465                          * parameters match those of server certificate, use
2466                          * certificate key for key exchange
2467                          */
2468
2469                          /* Otherwise, generate ephemeral key pair */
2470
2471                         EVP_PKEY_encrypt_init(pkey_ctx);
2472                           /* Generate session key */
2473                     RAND_bytes(premaster_secret,32);
2474                         /* If we have client certificate, use its secret as peer key */
2475                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2476                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2477                                         /* If there was an error - just ignore it. Ephemeral key
2478                                         * would be used
2479                                         */
2480                                         ERR_clear_error();
2481                                 }
2482                         }
2483                         /* Compute shared IV and store it in algorithm-specific
2484                          * context data */
2485                         ukm_hash = EVP_MD_CTX_create();
2486                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2487                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2488                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2489                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2490                         EVP_MD_CTX_destroy(ukm_hash);
2491                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2492                                 8,shared_ukm)<0) {
2493                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2494                                                 SSL_R_LIBRARY_BUG);
2495                                         goto err;
2496                                 }
2497                         /* Make GOST keytransport blob message */
2498                         /*Encapsulate it into sequence */
2499                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2500                         msglen=255;
2501                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2502                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2503                                         SSL_R_LIBRARY_BUG);
2504                                 goto err;
2505                         }
2506                         if (msglen >= 0x80)
2507                                 {
2508                                 *(p++)=0x81;
2509                                 *(p++)= msglen & 0xff;
2510                                 n=msglen+3;
2511                                 }
2512                         else
2513                                 {
2514                                 *(p++)= msglen & 0xff;
2515                                 n=msglen+2;
2516                                 }
2517                         memcpy(p, tmp, msglen);
2518                         /* Check if pubkey from client certificate was used */
2519                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2520                                 {
2521                                 /* Set flag "skip certificate verify" */
2522                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2523                                 }
2524                         EVP_PKEY_CTX_free(pkey_ctx);
2525                         s->session->master_key_length=
2526                                 s->method->ssl3_enc->generate_master_secret(s,
2527                                         s->session->master_key,premaster_secret,32);
2528                         EVP_PKEY_free(pub_key);
2529
2530                         }
2531 #ifndef OPENSSL_NO_PSK
2532                 else if (alg_k & SSL_kPSK)
2533                         {
2534                         char identity[PSK_MAX_IDENTITY_LEN];
2535                         unsigned char *t = NULL;
2536                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2537                         unsigned int pre_ms_len = 0, psk_len = 0;
2538                         int psk_err = 1;
2539
2540                         n = 0;
2541                         if (s->psk_client_callback == NULL)
2542                                 {
2543                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2544                                         SSL_R_PSK_NO_CLIENT_CB);
2545                                 goto err;
2546                                 }
2547
2548                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2549                                 identity, PSK_MAX_IDENTITY_LEN,
2550                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2551                         if (psk_len > PSK_MAX_PSK_LEN)
2552                                 {
2553                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2554                                         ERR_R_INTERNAL_ERROR);
2555                                 goto psk_err;
2556                                 }
2557                         else if (psk_len == 0)
2558                                 {
2559                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2560                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2561                                 goto psk_err;
2562                                 }
2563
2564                         /* create PSK pre_master_secret */
2565                         pre_ms_len = 2+psk_len+2+psk_len;
2566                         t = psk_or_pre_ms;
2567                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2568                         s2n(psk_len, t);
2569                         memset(t, 0, psk_len);
2570                         t+=psk_len;
2571                         s2n(psk_len, t);
2572
2573                         if (s->session->psk_identity_hint != NULL)
2574                                 OPENSSL_free(s->session->psk_identity_hint);
2575                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2576                         if (s->ctx->psk_identity_hint != NULL &&
2577                                 s->session->psk_identity_hint == NULL)
2578                                 {
2579                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2580                                         ERR_R_MALLOC_FAILURE);
2581                                 goto psk_err;
2582                                 }
2583
2584                         if (s->session->psk_identity != NULL)
2585                                 OPENSSL_free(s->session->psk_identity);
2586                         s->session->psk_identity = BUF_strdup(identity);
2587                         if (s->session->psk_identity == NULL)
2588                                 {
2589                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2590                                         ERR_R_MALLOC_FAILURE);
2591                                 goto psk_err;
2592                                 }
2593
2594                         s->session->master_key_length =
2595                                 s->method->ssl3_enc->generate_master_secret(s,
2596                                         s->session->master_key,
2597                                         psk_or_pre_ms, pre_ms_len);
2598                         n = strlen(identity);
2599                         s2n(n, p);
2600                         memcpy(p, identity, n);
2601                         n+=2;
2602                         psk_err = 0;
2603                 psk_err:
2604                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2605                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2606                         if (psk_err != 0)
2607                                 {
2608                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2609                                 goto err;
2610                                 }
2611                         }
2612 #endif
2613                 else
2614                         {
2615                         ssl3_send_alert(s, SSL3_AL_FATAL,
2616                             SSL_AD_HANDSHAKE_FAILURE);
2617                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2618                             ERR_R_INTERNAL_ERROR);
2619                         goto err;
2620                         }
2621
2622                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2623                 l2n3(n,d);
2624
2625                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2626                 /* number of bytes to write */
2627                 s->init_num=n+4;
2628                 s->init_off=0;
2629                 }
2630
2631         /* SSL3_ST_CW_KEY_EXCH_B */
2632         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2633 err:
2634 #ifndef OPENSSL_NO_ECDH
2635         BN_CTX_free(bn_ctx);
2636         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2637         if (clnt_ecdh != NULL)
2638                 EC_KEY_free(clnt_ecdh);
2639         EVP_PKEY_free(srvr_pub_pkey);
2640 #endif
2641         return(-1);
2642         }
2643
2644 int ssl3_send_client_verify(SSL *s)
2645         {
2646         unsigned char *p,*d;
2647         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2648         EVP_PKEY *pkey;
2649         EVP_PKEY_CTX *pctx=NULL;
2650 #ifndef OPENSSL_NO_RSA
2651         unsigned u=0;
2652 #endif
2653         unsigned long n;
2654 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2655         int j;
2656 #endif
2657
2658         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2659                 {
2660                 d=(unsigned char *)s->init_buf->data;
2661                 p= &(d[4]);
2662                 pkey=s->cert->key->privatekey;
2663 /* Create context from key and test if sha1 is allowed as digest */
2664                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2665                 EVP_PKEY_sign_init(pctx);
2666                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2667                         {
2668                         s->method->ssl3_enc->cert_verify_mac(s,
2669                                                 NID_sha1,
2670                                                 &(data[MD5_DIGEST_LENGTH]));
2671                         }
2672                 else
2673                         {
2674                         ERR_clear_error();
2675                         }
2676 #ifndef OPENSSL_NO_RSA
2677                 if (pkey->type == EVP_PKEY_RSA)
2678                         {
2679                         s->method->ssl3_enc->cert_verify_mac(s,
2680                                 NID_md5,
2681                                 &(data[0]));
2682                         if (RSA_sign(NID_md5_sha1, data,
2683                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2684                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2685                                 {
2686                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2687                                 goto err;
2688                                 }
2689                         s2n(u,p);
2690                         n=u+2;
2691                         }
2692                 else
2693 #endif
2694 #ifndef OPENSSL_NO_DSA
2695                         if (pkey->type == EVP_PKEY_DSA)
2696                         {
2697                         if (!DSA_sign(pkey->save_type,
2698                                 &(data[MD5_DIGEST_LENGTH]),
2699                                 SHA_DIGEST_LENGTH,&(p[2]),
2700                                 (unsigned int *)&j,pkey->pkey.dsa))
2701                                 {
2702                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2703                                 goto err;
2704                                 }
2705                         s2n(j,p);
2706                         n=j+2;
2707                         }
2708                 else
2709 #endif
2710 #ifndef OPENSSL_NO_ECDSA
2711                         if (pkey->type == EVP_PKEY_EC)
2712                         {
2713                         if (!ECDSA_sign(pkey->save_type,
2714                                 &(data[MD5_DIGEST_LENGTH]),
2715                                 SHA_DIGEST_LENGTH,&(p[2]),
2716                                 (unsigned int *)&j,pkey->pkey.ec))
2717                                 {
2718                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2719                                     ERR_R_ECDSA_LIB);
2720                                 goto err;
2721                                 }
2722                         s2n(j,p);
2723                         n=j+2;
2724                         }
2725                 else
2726 #endif
2727                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2728                 {
2729                 unsigned char signbuf[64];
2730                 int i;
2731                 size_t sigsize=64;
2732                 s->method->ssl3_enc->cert_verify_mac(s,
2733                         NID_id_GostR3411_94,
2734                         data);
2735                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2736                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2737                         ERR_R_INTERNAL_ERROR);
2738                         goto err;
2739                 }
2740                 for (i=63,j=0; i>=0; j++, i--) {
2741                         p[2+j]=signbuf[i];
2742                 }
2743                 s2n(j,p);
2744                 n=j+2;
2745                 }
2746                 else
2747                 {
2748                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2749                         goto err;
2750                 }
2751                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2752                 l2n3(n,d);
2753
2754                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2755                 s->init_num=(int)n+4;
2756                 s->init_off=0;
2757                 }
2758         EVP_PKEY_CTX_free(pctx);
2759         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2760 err:
2761         EVP_PKEY_CTX_free(pctx);
2762         return(-1);
2763         }
2764
2765 int ssl3_send_client_certificate(SSL *s)
2766         {
2767         X509 *x509=NULL;
2768         EVP_PKEY *pkey=NULL;
2769         int i;
2770         unsigned long l;
2771
2772         if (s->state == SSL3_ST_CW_CERT_A)
2773                 {
2774                 if ((s->cert == NULL) ||
2775                         (s->cert->key->x509 == NULL) ||
2776                         (s->cert->key->privatekey == NULL))
2777                         s->state=SSL3_ST_CW_CERT_B;
2778                 else
2779                         s->state=SSL3_ST_CW_CERT_C;
2780                 }
2781
2782         /* We need to get a client cert */
2783         if (s->state == SSL3_ST_CW_CERT_B)
2784                 {
2785                 /* If we get an error, we need to
2786                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2787                  * We then get retied later */
2788                 i=0;
2789                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2790                 if (i < 0)
2791                         {
2792                         s->rwstate=SSL_X509_LOOKUP;
2793                         return(-1);
2794                         }
2795                 s->rwstate=SSL_NOTHING;
2796                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2797                         {
2798                         s->state=SSL3_ST_CW_CERT_B;
2799                         if (    !SSL_use_certificate(s,x509) ||
2800                                 !SSL_use_PrivateKey(s,pkey))
2801                                 i=0;
2802                         }
2803                 else if (i == 1)
2804                         {
2805                         i=0;
2806                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2807                         }
2808
2809                 if (x509 != NULL) X509_free(x509);
2810                 if (pkey != NULL) EVP_PKEY_free(pkey);
2811                 if (i == 0)
2812                         {
2813                         if (s->version == SSL3_VERSION)
2814                                 {
2815                                 s->s3->tmp.cert_req=0;
2816                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2817                                 return(1);
2818                                 }
2819                         else
2820                                 {
2821                                 s->s3->tmp.cert_req=2;
2822                                 }
2823                         }
2824
2825                 /* Ok, we have a cert */
2826                 s->state=SSL3_ST_CW_CERT_C;
2827                 }
2828
2829         if (s->state == SSL3_ST_CW_CERT_C)
2830                 {
2831                 s->state=SSL3_ST_CW_CERT_D;
2832                 l=ssl3_output_cert_chain(s,
2833                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2834                 s->init_num=(int)l;
2835                 s->init_off=0;
2836                 }
2837         /* SSL3_ST_CW_CERT_D */
2838         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2839         }
2840
2841 #define has_bits(i,m)   (((i)&(m)) == (m))
2842
2843 int ssl3_check_cert_and_algorithm(SSL *s)
2844         {
2845         int i,idx;
2846         long alg_k,alg_a;
2847         EVP_PKEY *pkey=NULL;
2848         SESS_CERT *sc;
2849 #ifndef OPENSSL_NO_RSA
2850         RSA *rsa;
2851 #endif
2852 #ifndef OPENSSL_NO_DH
2853         DH *dh;
2854 #endif
2855
2856         sc=s->session->sess_cert;
2857         if (sc == NULL)
2858                 {
2859                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2860                 goto err;
2861                 }
2862
2863         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2864         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2865
2866         /* we don't have a certificate */
2867         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2868                 return(1);
2869
2870 #ifndef OPENSSL_NO_RSA
2871         rsa=s->session->sess_cert->peer_rsa_tmp;
2872 #endif
2873 #ifndef OPENSSL_NO_DH
2874         dh=s->session->sess_cert->peer_dh_tmp;
2875 #endif
2876
2877         /* This is the passed certificate */
2878
2879         idx=sc->peer_cert_type;
2880 #ifndef OPENSSL_NO_ECDH
2881         if (idx == SSL_PKEY_ECC)
2882                 {
2883                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2884                     s->s3->tmp.new_cipher) == 0)
2885                         { /* check failed */
2886                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2887                         goto f_err;
2888                         }
2889                 else
2890                         {
2891                         return 1;
2892                         }
2893                 }
2894 #endif
2895         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2896         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2897         EVP_PKEY_free(pkey);
2898
2899
2900         /* Check that we have a certificate if we require one */
2901         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2902                 {
2903                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2904                 goto f_err;
2905                 }
2906 #ifndef OPENSSL_NO_DSA
2907         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2908                 {
2909                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2910                 goto f_err;
2911                 }
2912 #endif
2913 #ifndef OPENSSL_NO_RSA
2914         if ((alg_k & SSL_kRSA) &&
2915                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2916                 {
2917                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2918                 goto f_err;
2919                 }
2920 #endif
2921 #ifndef OPENSSL_NO_DH
2922         if ((alg_k & SSL_kEDH) &&
2923                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2924                 {
2925                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2926                 goto f_err;
2927                 }
2928         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2929                 {
2930                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2931                 goto f_err;
2932                 }
2933 #ifndef OPENSSL_NO_DSA
2934         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2935                 {
2936                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2937                 goto f_err;
2938                 }
2939 #endif
2940 #endif
2941
2942         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2943                 {
2944 #ifndef OPENSSL_NO_RSA
2945                 if (alg_k & SSL_kRSA)
2946                         {
2947                         if (rsa == NULL
2948                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2949                                 {
2950                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2951                                 goto f_err;
2952                                 }
2953                         }
2954                 else
2955 #endif
2956 #ifndef OPENSSL_NO_DH
2957                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2958                             {
2959                             if (dh == NULL
2960                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2961                                 {
2962                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2963                                 goto f_err;
2964                                 }
2965                         }
2966                 else
2967 #endif
2968                         {
2969                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2970                         goto f_err;
2971                         }
2972                 }
2973         return(1);
2974 f_err:
2975         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2976 err:
2977         return(0);
2978         }
2979
2980 /* Check to see if handshake is full or resumed. Usually this is just a
2981  * case of checking to see if a cache hit has occurred. In the case of
2982  * session tickets we have to check the next message to be sure.
2983  */
2984
2985 #ifndef OPENSSL_NO_TLSEXT
2986 int ssl3_check_finished(SSL *s)
2987         {
2988         int ok;
2989         long n;
2990         /* If we have no ticket it cannot be a resumed session. */
2991         if (!s->session->tlsext_tick)
2992                 return 1;
2993         /* this function is called when we really expect a Certificate
2994          * message, so permit appropriate message length */
2995         n=s->method->ssl_get_message(s,
2996                 SSL3_ST_CR_CERT_A,
2997                 SSL3_ST_CR_CERT_B,
2998                 -1,
2999                 s->max_cert_list,
3000                 &ok);
3001         if (!ok) return((int)n);
3002         s->s3->tmp.reuse_message = 1;
3003         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3004                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3005                 return 2;
3006
3007         return 1;
3008         }
3009 #endif
3010
3011 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3012         {
3013         int i = 0;
3014 #ifndef OPENSSL_NO_ENGINE
3015         if (s->ctx->client_cert_engine)
3016                 {
3017                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3018                                                 SSL_get_client_CA_list(s),
3019                                                 px509, ppkey, NULL, NULL, NULL);
3020                 if (i != 0)
3021                         return i;
3022                 }
3023 #endif
3024         if (s->ctx->client_cert_cb)
3025                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3026         return i;
3027         }