ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver);
 168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 188         int ret= -1;
 189         int new_state,state,skip=0;
 190
 191         RAND_add(&Time,sizeof(Time),0);
 192         ERR_clear_error();
 193         clear_sys_error();
 194
 195         if (s->info_callback != NULL)
 196                 cb=s->info_callback;
 197         else if (s->ctx->info_callback != NULL)
 198                 cb=s->ctx->info_callback;
 199
 200         s->in_handshake++;
 201         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 202
 203         for (;;)
 204                 {
 205                 state=s->state;
 206
 207                 switch(s->state)
 208                         {
 209                 case SSL_ST_RENEGOTIATE:
 210                         s->renegotiate=1;
 211                         s->state=SSL_ST_CONNECT;
 212                         s->ctx->stats.sess_connect_renegotiate++;
 213                         /* break */
 214                 case SSL_ST_BEFORE:
 215                 case SSL_ST_CONNECT:
 216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 217                 case SSL_ST_OK|SSL_ST_CONNECT:
 218
 219                         s->server=0;
 220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 221
 222                         if ((s->version & 0xff00 ) != 0x0300)
 223                                 {
 224                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 225                                 ret = -1;
 226                                 goto end;
 227                                 }
 228
 229                         /* s->version=SSL3_VERSION; */
 230                         s->type=SSL_ST_CONNECT;
 231
 232                         if (s->init_buf == NULL)
 233                                 {
 234                                 if ((buf=BUF_MEM_new()) == NULL)
 235                                         {
 236                                         ret= -1;
 237                                         goto end;
 238                                         }
 239                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 240                                         {
 241                                         ret= -1;
 242                                         goto end;
 243                                         }
 244                                 s->init_buf=buf;
 245                                 buf=NULL;
 246                                 }
 247
 248                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 249
 250                         /* setup buffing BIO */
 251                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 252
 253                         /* don't push the buffering BIO quite yet */
 254
 255                         ssl3_init_finished_mac(s);
 256
 257                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 258                         s->ctx->stats.sess_connect++;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_CW_CLNT_HELLO_A:
 263                 case SSL3_ST_CW_CLNT_HELLO_B:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 269                         s->init_num=0;
 270
 271                         /* turn on buffering for the next lot of output */
 272                         if (s->bbio != s->wbio)
 273                                 s->wbio=BIO_push(s->bbio,s->wbio);
 274
 275                         break;
 276
 277                 case SSL3_ST_CR_SRVR_HELLO_A:
 278                 case SSL3_ST_CR_SRVR_HELLO_B:
 279                         ret=ssl3_get_server_hello(s);
 280                         if (ret <= 0) goto end;
 281
 282                         if (s->hit)
 283                                 s->state=SSL3_ST_CR_FINISHED_A;
 284                         else
 285                                 s->state=SSL3_ST_CR_CERT_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CR_CERT_A:
 290                 case SSL3_ST_CR_CERT_B:
 291 #ifndef OPENSSL_NO_TLSEXT
 292                         ret=ssl3_check_finished(s);
 293                         if (ret <= 0) goto end;
 294                         if (ret == 2)
 295                                 {
 296                                 s->hit = 1;
 297                                 if (s->tlsext_ticket_expected)
 298                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 299                                 else
 300                                         s->state=SSL3_ST_CR_FINISHED_A;
 301                                 s->init_num=0;
 302                                 break;
 303                                 }
 304 #endif
 305                         /* Check if it is anon DH/ECDH */
 306                         /* or PSK */
 307                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 308                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 309                                 {
 310                                 ret=ssl3_get_server_certificate(s);
 311                                 if (ret <= 0) goto end;
 312 #ifndef OPENSSL_NO_TLSEXT
 313                                 if (s->tlsext_status_expected)
 314                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 315                                 else
 316                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 317                                 }
 318                         else
 319                                 {
 320                                 skip = 1;
 321                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 322                                 }
 323 #else
 324                                 }
 325                         else
 326                                 skip=1;
 327
 328                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 329 #endif
 330                         s->init_num=0;
 331                         break;
 332
 333                 case SSL3_ST_CR_KEY_EXCH_A:
 334                 case SSL3_ST_CR_KEY_EXCH_B:
 335                         ret=ssl3_get_key_exchange(s);
 336                         if (ret <= 0) goto end;
 337                         s->state=SSL3_ST_CR_CERT_REQ_A;
 338                         s->init_num=0;
 339
 340                         /* at this point we check that we have the
 341                          * required stuff from the server */
 342                         if (!ssl3_check_cert_and_algorithm(s))
 343                                 {
 344                                 ret= -1;
 345                                 goto end;
 346                                 }
 347                         break;
 348
 349                 case SSL3_ST_CR_CERT_REQ_A:
 350                 case SSL3_ST_CR_CERT_REQ_B:
 351                         ret=ssl3_get_certificate_request(s);
 352                         if (ret <= 0) goto end;
 353                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_SRVR_DONE_A:
 358                 case SSL3_ST_CR_SRVR_DONE_B:
 359                         ret=ssl3_get_server_done(s);
 360                         if (ret <= 0) goto end;
 361                         if (s->s3->tmp.cert_req)
 362                                 s->state=SSL3_ST_CW_CERT_A;
 363                         else
 364                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 365                         s->init_num=0;
 366
 367                         break;
 368
 369                 case SSL3_ST_CW_CERT_A:
 370                 case SSL3_ST_CW_CERT_B:
 371                 case SSL3_ST_CW_CERT_C:
 372                 case SSL3_ST_CW_CERT_D:
 373                         ret=ssl3_send_client_certificate(s);
 374                         if (ret <= 0) goto end;
 375                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 376                         s->init_num=0;
 377                         break;
 378
 379                 case SSL3_ST_CW_KEY_EXCH_A:
 380                 case SSL3_ST_CW_KEY_EXCH_B:
 381                         ret=ssl3_send_client_key_exchange(s);
 382                         if (ret <= 0) goto end;
 383                         /* EAY EAY EAY need to check for DH fix cert
 384                          * sent back */
 385                         /* For TLS, cert_req is set to 2, so a cert chain
 386                          * of nothing is sent, but no verify packet is sent */
 387                         /* XXX: For now, we do not support client
 388                          * authentication in ECDH cipher suites with
 389                          * ECDH (rather than ECDSA) certificates.
 390                          * We need to skip the certificate verify
 391                          * message when client's ECDH public key is sent
 392                          * inside the client certificate.
 393                          */
 394                         if (s->s3->tmp.cert_req == 1)
 395                                 {
 396                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 397                                 }
 398                         else
 399                                 {
 400                                 s->state=SSL3_ST_CW_CHANGE_A;
 401                                 s->s3->change_cipher_spec=0;
 402                                 }
 403                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 404                                 {
 405                                 s->state=SSL3_ST_CW_CHANGE_A;
 406                                 s->s3->change_cipher_spec=0;
 407                                 }
 408
 409                         s->init_num=0;
 410                         break;
 411
 412                 case SSL3_ST_CW_CERT_VRFY_A:
 413                 case SSL3_ST_CW_CERT_VRFY_B:
 414                         ret=ssl3_send_client_verify(s);
 415                         if (ret <= 0) goto end;
 416                         s->state=SSL3_ST_CW_CHANGE_A;
 417                         s->init_num=0;
 418                         s->s3->change_cipher_spec=0;
 419                         break;
 420
 421                 case SSL3_ST_CW_CHANGE_A:
 422                 case SSL3_ST_CW_CHANGE_B:
 423                         ret=ssl3_send_change_cipher_spec(s,
 424                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 425                         if (ret <= 0) goto end;
 426
 427 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 428                         s->state=SSL3_ST_CW_FINISHED_A;
 429 #else
 430                         if (s->next_proto_negotiated)
 431                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 432                         else
 433                                 s->state=SSL3_ST_CW_FINISHED_A;
 434 #endif
 435                         s->init_num=0;
 436
 437                         s->session->cipher=s->s3->tmp.new_cipher;
 438 #ifdef OPENSSL_NO_COMP
 439                         s->session->compress_meth=0;
 440 #else
 441                         if (s->s3->tmp.new_compression == NULL)
 442                                 s->session->compress_meth=0;
 443                         else
 444                                 s->session->compress_meth=
 445                                         s->s3->tmp.new_compression->id;
 446 #endif
 447                         if (!s->method->ssl3_enc->setup_key_block(s))
 448                                 {
 449                                 ret= -1;
 450                                 goto end;
 451                                 }
 452
 453                         if (!s->method->ssl3_enc->change_cipher_state(s,
 454                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 455                                 {
 456                                 ret= -1;
 457                                 goto end;
 458                                 }
 459
 460                         break;
 461
 462 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 463                 case SSL3_ST_CW_NEXT_PROTO_A:
 464                 case SSL3_ST_CW_NEXT_PROTO_B:
 465                         ret=ssl3_send_next_proto(s);
 466                         if (ret <= 0) goto end;
 467                         s->state=SSL3_ST_CW_FINISHED_A;
 468                         break;
 469 #endif
 470
 471                 case SSL3_ST_CW_FINISHED_A:
 472                 case SSL3_ST_CW_FINISHED_B:
 473                         ret=ssl3_send_finished(s,
 474                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 475                                 s->method->ssl3_enc->client_finished_label,
 476                                 s->method->ssl3_enc->client_finished_label_len);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CW_FLUSH;
 479
 480                         /* clear flags */
 481                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 482                         if (s->hit)
 483                                 {
 484                                 s->s3->tmp.next_state=SSL_ST_OK;
 485                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 486                                         {
 487                                         s->state=SSL_ST_OK;
 488                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 489                                         s->s3->delay_buf_pop_ret=0;
 490                                         }
 491                                 }
 492                         else
 493                                 {
 494 #ifndef OPENSSL_NO_TLSEXT
 495                                 /* Allow NewSessionTicket if ticket expected */
 496                                 if (s->tlsext_ticket_expected)
 497                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 498                                 else
 499 #endif
 500
 501                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 502                                 }
 503                         s->init_num=0;
 504                         break;
 505
 506 #ifndef OPENSSL_NO_TLSEXT
 507                 case SSL3_ST_CR_SESSION_TICKET_A:
 508                 case SSL3_ST_CR_SESSION_TICKET_B:
 509                         ret=ssl3_get_new_session_ticket(s);
 510                         if (ret <= 0) goto end;
 511                         s->state=SSL3_ST_CR_FINISHED_A;
 512                         s->init_num=0;
 513                 break;
 514
 515                 case SSL3_ST_CR_CERT_STATUS_A:
 516                 case SSL3_ST_CR_CERT_STATUS_B:
 517                         ret=ssl3_get_cert_status(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 520                         s->init_num=0;
 521                 break;
 522 #endif
 523
 524                 case SSL3_ST_CR_FINISHED_A:
 525                 case SSL3_ST_CR_FINISHED_B:
 526
 527                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 528                                 SSL3_ST_CR_FINISHED_B);
 529                         if (ret <= 0) goto end;
 530
 531                         if (s->hit)
 532                                 s->state=SSL3_ST_CW_CHANGE_A;
 533                         else
 534                                 s->state=SSL_ST_OK;
 535                         s->init_num=0;
 536                         break;
 537
 538                 case SSL3_ST_CW_FLUSH:
 539                         s->rwstate=SSL_WRITING;
 540                         if (BIO_flush(s->wbio) <= 0)
 541                                 {
 542                                 ret= -1;
 543                                 goto end;
 544                                 }
 545                         s->rwstate=SSL_NOTHING;
 546                         s->state=s->s3->tmp.next_state;
 547                         break;
 548
 549                 case SSL_ST_OK:
 550                         /* clean a few things up */
 551                         ssl3_cleanup_key_block(s);
 552
 553                         if (s->init_buf != NULL)
 554                                 {
 555                                 BUF_MEM_free(s->init_buf);
 556                                 s->init_buf=NULL;
 557                                 }
 558
 559                         /* If we are not 'joining' the last two packets,
 560                          * remove the buffering now */
 561                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 562                                 ssl_free_wbio_buffer(s);
 563                         /* else do it later in ssl3_write */
 564
 565                         s->init_num=0;
 566                         s->renegotiate=0;
 567                         s->new_session=0;
 568
 569                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 570                         if (s->hit) s->ctx->stats.sess_hit++;
 571
 572                         ret=1;
 573                         /* s->server=0; */
 574                         s->handshake_func=ssl3_connect;
 575                         s->ctx->stats.sess_connect_good++;
 576
 577                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 578
 579                         goto end;
 580                         /* break; */
 581
 582                 default:
 583                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 584                         ret= -1;
 585                         goto end;
 586                         /* break; */
 587                         }
 588
 589                 /* did we do anything */
 590                 if (!s->s3->tmp.reuse_message && !skip)
 591                         {
 592                         if (s->debug)
 593                                 {
 594                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 595                                         goto end;
 596                                 }
 597
 598                         if ((cb != NULL) && (s->state != state))
 599                                 {
 600                                 new_state=s->state;
 601                                 s->state=state;
 602                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 603                                 s->state=new_state;
 604                                 }
 605                         }
 606                 skip=0;
 607                 }
 608 end:
 609         s->in_handshake--;
 610         if (buf != NULL)
 611                 BUF_MEM_free(buf);
 612         if (cb != NULL)
 613                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 614         return(ret);
 615         }
 616
 617
 618 int ssl3_client_hello(SSL *s)
 619         {
 620         unsigned char *buf;
 621         unsigned char *p,*d;
 622         int i;
 623         unsigned long Time,l;
 624 #ifndef OPENSSL_NO_COMP
 625         int j;
 626         SSL_COMP *comp;
 627 #endif
 628
 629         buf=(unsigned char *)s->init_buf->data;
 630         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 631                 {
 632                 SSL_SESSION *sess = s->session;
 633                 if ((sess == NULL) ||
 634                         (sess->ssl_version != s->version) ||
 635 #ifdef OPENSSL_NO_TLSEXT
 636                         !sess->session_id_length ||
 637 #else
 638                         (!sess->session_id_length && !sess->tlsext_tick) ||
 639 #endif
 640                         (sess->not_resumable))
 641                         {
 642                         if (!ssl_get_new_session(s,0))
 643                                 goto err;
 644                         }
 645                 /* else use the pre-loaded session */
 646
 647                 p=s->s3->client_random;
 648                 Time=(unsigned long)time(NULL);                 /* Time */
 649                 l2n(Time,p);
 650                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 651                         goto err;
 652
 653                 /* Do the message type and length last */
 654                 d=p= &(buf[4]);
 655
 656                 *(p++)=s->version>>8;
 657                 *(p++)=s->version&0xff;
 658                 s->client_version=s->version;
 659
 660                 /* Random stuff */
 661                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 662                 p+=SSL3_RANDOM_SIZE;
 663
 664                 /* Session ID */
 665                 if (s->new_session)
 666                         i=0;
 667                 else
 668                         i=s->session->session_id_length;
 669                 *(p++)=i;
 670                 if (i != 0)
 671                         {
 672                         if (i > (int)sizeof(s->session->session_id))
 673                                 {
 674                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 675                                 goto err;
 676                                 }
 677                         memcpy(p,s->session->session_id,i);
 678                         p+=i;
 679                         }
 680
 681                 /* Ciphers supported */
 682                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 683                 if (i == 0)
 684                         {
 685                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 686                         goto err;
 687                         }
 688                 s2n(i,p);
 689                 p+=i;
 690
 691                 /* COMPRESSION */
 692 #ifdef OPENSSL_NO_COMP
 693                 *(p++)=1;
 694 #else
 695
 696                 if ((s->options & SSL_OP_NO_COMPRESSION)
 697                                         || !s->ctx->comp_methods)
 698                         j=0;
 699                 else
 700                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 701                 *(p++)=1+j;
 702                 for (i=0; i<j; i++)
 703                         {
 704                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 705                         *(p++)=comp->id;
 706                         }
 707 #endif
 708                 *(p++)=0; /* Add the NULL method */
 709
 710 #ifndef OPENSSL_NO_TLSEXT
 711                 /* TLS extensions*/
 712                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 713                         {
 714                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 715                         goto err;
 716                         }
 717                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 718                         {
 719                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 720                         goto err;
 721                         }
 722 #endif
 723
 724                 l=(p-d);
 725                 d=buf;
 726                 *(d++)=SSL3_MT_CLIENT_HELLO;
 727                 l2n3(l,d);
 728
 729                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 730                 /* number of bytes to write */
 731                 s->init_num=p-buf;
 732                 s->init_off=0;
 733                 }
 734
 735         /* SSL3_ST_CW_CLNT_HELLO_B */
 736         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 737 err:
 738         return(-1);
 739         }
 740
 741 int ssl3_get_server_hello(SSL *s)
 742         {
 743         STACK_OF(SSL_CIPHER) *sk;
 744         const SSL_CIPHER *c;
 745         unsigned char *p,*d;
 746         int i,al,ok;
 747         unsigned int j;
 748         long n;
 749 #ifndef OPENSSL_NO_COMP
 750         SSL_COMP *comp;
 751 #endif
 752
 753         n=s->method->ssl_get_message(s,
 754                 SSL3_ST_CR_SRVR_HELLO_A,
 755                 SSL3_ST_CR_SRVR_HELLO_B,
 756                 -1,
 757                 20000, /* ?? */
 758                 &ok);
 759
 760         if (!ok) return((int)n);
 761
 762         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 763                 {
 764                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 765                         {
 766                         if ( s->d1->send_cookie == 0)
 767                                 {
 768                                 s->s3->tmp.reuse_message = 1;
 769                                 return 1;
 770                                 }
 771                         else /* already sent a cookie */
 772                                 {
 773                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 774                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 775                                 goto f_err;
 776                                 }
 777                         }
 778                 }
 779
 780         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 781                 {
 782                 al=SSL_AD_UNEXPECTED_MESSAGE;
 783                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 784                 goto f_err;
 785                 }
 786
 787         d=p=(unsigned char *)s->init_msg;
 788
 789         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 790                 {
 791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 792                 s->version=(s->version&0xff00)|p[1];
 793                 al=SSL_AD_PROTOCOL_VERSION;
 794                 goto f_err;
 795                 }
 796         p+=2;
 797
 798         /* load the server hello data */
 799         /* load the server random */
 800         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 801         p+=SSL3_RANDOM_SIZE;
 802
 803         /* get the session-id */
 804         j= *(p++);
 805
 806         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 807                 {
 808                 al=SSL_AD_ILLEGAL_PARAMETER;
 809                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 810                 goto f_err;
 811                 }
 812
 813 #ifndef OPENSSL_NO_TLSEXT
 814         /* check if we want to resume the session based on external pre-shared secret */
 815         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 816                 {
 817                 SSL_CIPHER *pref_cipher=NULL;
 818                 s->session->master_key_length=sizeof(s->session->master_key);
 819                 if (s->tls_session_secret_cb(s, s->session->master_key,
 820                                              &s->session->master_key_length,
 821                                              NULL, &pref_cipher,
 822                                              s->tls_session_secret_cb_arg))
 823                         {
 824                         s->session->cipher = pref_cipher ?
 825                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 826                         }
 827                 }
 828 #endif /* OPENSSL_NO_TLSEXT */
 829
 830         if (j != 0 && j == s->session->session_id_length
 831             && memcmp(p,s->session->session_id,j) == 0)
 832             {
 833             if(s->sid_ctx_length != s->session->sid_ctx_length
 834                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 835                 {
 836                 /* actually a client application bug */
 837                 al=SSL_AD_ILLEGAL_PARAMETER;
 838                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 839                 goto f_err;
 840                 }
 841             s->hit=1;
 842             }
 843         else    /* a miss or crap from the other end */
 844                 {
 845                 /* If we were trying for session-id reuse, make a new
 846                  * SSL_SESSION so we don't stuff up other people */
 847                 s->hit=0;
 848                 if (s->session->session_id_length > 0)
 849                         {
 850                         if (!ssl_get_new_session(s,0))
 851                                 {
 852                                 al=SSL_AD_INTERNAL_ERROR;
 853                                 goto f_err;
 854                                 }
 855                         }
 856                 s->session->session_id_length=j;
 857                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 858                 }
 859         p+=j;
 860         c=ssl_get_cipher_by_char(s,p);
 861         if (c == NULL)
 862                 {
 863                 /* unknown cipher */
 864                 al=SSL_AD_ILLEGAL_PARAMETER;
 865                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 866                 goto f_err;
 867                 }
 868         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 869
 870         sk=ssl_get_ciphers_by_id(s);
 871         i=sk_SSL_CIPHER_find(sk,c);
 872         if (i < 0)
 873                 {
 874                 /* we did not say we would use this cipher */
 875                 al=SSL_AD_ILLEGAL_PARAMETER;
 876                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 877                 goto f_err;
 878                 }
 879
 880         /* Depending on the session caching (internal/external), the cipher
 881            and/or cipher_id values may not be set. Make sure that
 882            cipher_id is set and use it for comparison. */
 883         if (s->session->cipher)
 884                 s->session->cipher_id = s->session->cipher->id;
 885         if (s->hit && (s->session->cipher_id != c->id))
 886                 {
 887 /* Workaround is now obsolete */
 888 #if 0
 889                 if (!(s->options &
 890                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 891 #endif
 892                         {
 893                         al=SSL_AD_ILLEGAL_PARAMETER;
 894                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 895                         goto f_err;
 896                         }
 897                 }
 898         s->s3->tmp.new_cipher=c;
 899         if (!ssl3_digest_cached_records(s))
 900                 goto f_err;
 901
 902         /* lets get the compression algorithm */
 903         /* COMPRESSION */
 904 #ifdef OPENSSL_NO_COMP
 905         if (*(p++) != 0)
 906                 {
 907                 al=SSL_AD_ILLEGAL_PARAMETER;
 908                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 909                 goto f_err;
 910                 }
 911         /* If compression is disabled we'd better not try to resume a session
 912          * using compression.
 913          */
 914         if (s->session->compress_meth != 0)
 915                 {
 916                 al=SSL_AD_INTERNAL_ERROR;
 917                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 918                 goto f_err;
 919                 }
 920 #else
 921         j= *(p++);
 922         if (s->hit && j != s->session->compress_meth)
 923                 {
 924                 al=SSL_AD_ILLEGAL_PARAMETER;
 925                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 926                 goto f_err;
 927                 }
 928         if (j == 0)
 929                 comp=NULL;
 930         else if (s->options & SSL_OP_NO_COMPRESSION)
 931                 {
 932                 al=SSL_AD_ILLEGAL_PARAMETER;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 934                 goto f_err;
 935                 }
 936         else
 937                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 938
 939         if ((j != 0) && (comp == NULL))
 940                 {
 941                 al=SSL_AD_ILLEGAL_PARAMETER;
 942                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 943                 goto f_err;
 944                 }
 945         else
 946                 {
 947                 s->s3->tmp.new_compression=comp;
 948                 }
 949 #endif
 950
 951 #ifndef OPENSSL_NO_TLSEXT
 952         /* TLS extensions*/
 953         if (s->version >= SSL3_VERSION)
 954                 {
 955                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 956                         {
 957                         /* 'al' set by ssl_parse_serverhello_tlsext */
 958                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 959                         goto f_err;
 960                         }
 961                 if (ssl_check_serverhello_tlsext(s) <= 0)
 962                         {
 963                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 964                                 goto err;
 965                         }
 966                 }
 967 #endif
 968
 969         if (p != (d+n))
 970                 {
 971                 /* wrong packet length */
 972                 al=SSL_AD_DECODE_ERROR;
 973                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 974                 goto err;
 975                 }
 976
 977         return(1);
 978 f_err:
 979         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 980 err:
 981         return(-1);
 982         }
 983
 984 int ssl3_get_server_certificate(SSL *s)
 985         {
 986         int al,i,ok,ret= -1;
 987         unsigned long n,nc,llen,l;
 988         X509 *x=NULL;
 989         const unsigned char *q,*p;
 990         unsigned char *d;
 991         STACK_OF(X509) *sk=NULL;
 992         SESS_CERT *sc;
 993         EVP_PKEY *pkey=NULL;
 994         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 995
 996         n=s->method->ssl_get_message(s,
 997                 SSL3_ST_CR_CERT_A,
 998                 SSL3_ST_CR_CERT_B,
 999                 -1,
1000                 s->max_cert_list,
1001                 &ok);
1002
1003         if (!ok) return((int)n);
1004
1005         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1006                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1007                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1008                 {
1009                 s->s3->tmp.reuse_message=1;
1010                 return(1);
1011                 }
1012
1013         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1014                 {
1015                 al=SSL_AD_UNEXPECTED_MESSAGE;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1017                 goto f_err;
1018                 }
1019         p=d=(unsigned char *)s->init_msg;
1020
1021         if ((sk=sk_X509_new_null()) == NULL)
1022                 {
1023                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1024                 goto err;
1025                 }
1026
1027         n2l3(p,llen);
1028         if (llen+3 != n)
1029                 {
1030                 al=SSL_AD_DECODE_ERROR;
1031                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1032                 goto f_err;
1033                 }
1034         for (nc=0; nc<llen; )
1035                 {
1036                 n2l3(p,l);
1037                 if ((l+nc+3) > llen)
1038                         {
1039                         al=SSL_AD_DECODE_ERROR;
1040                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1041                         goto f_err;
1042                         }
1043
1044                 q=p;
1045                 x=d2i_X509(NULL,&q,l);
1046                 if (x == NULL)
1047                         {
1048                         al=SSL_AD_BAD_CERTIFICATE;
1049                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1050                         goto f_err;
1051                         }
1052                 if (q != (p+l))
1053                         {
1054                         al=SSL_AD_DECODE_ERROR;
1055                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1056                         goto f_err;
1057                         }
1058                 if (!sk_X509_push(sk,x))
1059                         {
1060                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1061                         goto err;
1062                         }
1063                 x=NULL;
1064                 nc+=l+3;
1065                 p=q;
1066                 }
1067
1068         i=ssl_verify_cert_chain(s,sk);
1069         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1070 #ifndef OPENSSL_NO_KRB5
1071             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1072                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1073 #endif /* OPENSSL_NO_KRB5 */
1074                 )
1075                 {
1076                 al=ssl_verify_alarm_type(s->verify_result);
1077                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1078                 goto f_err;
1079                 }
1080         ERR_clear_error(); /* but we keep s->verify_result */
1081
1082         sc=ssl_sess_cert_new();
1083         if (sc == NULL) goto err;
1084
1085         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1086         s->session->sess_cert=sc;
1087
1088         sc->cert_chain=sk;
1089         /* Inconsistency alert: cert_chain does include the peer's
1090          * certificate, which we don't include in s3_srvr.c */
1091         x=sk_X509_value(sk,0);
1092         sk=NULL;
1093         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1094
1095         pkey=X509_get_pubkey(x);
1096
1097         /* VRS: allow null cert if auth == KRB5 */
1098         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1099                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1100                     ? 0 : 1;
1101
1102 #ifdef KSSL_DEBUG
1103         printf("pkey,x = %p, %p\n", pkey,x);
1104         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1105         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1106                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1107 #endif    /* KSSL_DEBUG */
1108
1109         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1110                 {
1111                 x=NULL;
1112                 al=SSL3_AL_FATAL;
1113                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1114                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1115                 goto f_err;
1116                 }
1117
1118         i=ssl_cert_type(x,pkey);
1119         if (need_cert && i < 0)
1120                 {
1121                 x=NULL;
1122                 al=SSL3_AL_FATAL;
1123                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1124                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1125                 goto f_err;
1126                 }
1127
1128         if (need_cert)
1129                 {
1130                 sc->peer_cert_type=i;
1131                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1132                 /* Why would the following ever happen?
1133                  * We just created sc a couple of lines ago. */
1134                 if (sc->peer_pkeys[i].x509 != NULL)
1135                         X509_free(sc->peer_pkeys[i].x509);
1136                 sc->peer_pkeys[i].x509=x;
1137                 sc->peer_key= &(sc->peer_pkeys[i]);
1138
1139                 if (s->session->peer != NULL)
1140                         X509_free(s->session->peer);
1141                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1142                 s->session->peer=x;
1143                 }
1144         else
1145                 {
1146                 sc->peer_cert_type=i;
1147                 sc->peer_key= NULL;
1148
1149                 if (s->session->peer != NULL)
1150                         X509_free(s->session->peer);
1151                 s->session->peer=NULL;
1152                 }
1153         s->session->verify_result = s->verify_result;
1154
1155         x=NULL;
1156         ret=1;
1157
1158         if (0)
1159                 {
1160 f_err:
1161                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1162                 }
1163 err:
1164         EVP_PKEY_free(pkey);
1165         X509_free(x);
1166         sk_X509_pop_free(sk,X509_free);
1167         return(ret);
1168         }
1169
1170 int ssl3_get_key_exchange(SSL *s)
1171         {
1172 #ifndef OPENSSL_NO_RSA
1173         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1174 #endif
1175         EVP_MD_CTX md_ctx;
1176         unsigned char *param,*p;
1177         int al,i,j,param_len,ok;
1178         long n,alg_k,alg_a;
1179         EVP_PKEY *pkey=NULL;
1180 #ifndef OPENSSL_NO_RSA
1181         RSA *rsa=NULL;
1182 #endif
1183 #ifndef OPENSSL_NO_DH
1184         DH *dh=NULL;
1185 #endif
1186 #ifndef OPENSSL_NO_ECDH
1187         EC_KEY *ecdh = NULL;
1188         BN_CTX *bn_ctx = NULL;
1189         EC_POINT *srvr_ecpoint = NULL;
1190         int curve_nid = 0;
1191         int encoded_pt_len = 0;
1192 #endif
1193
1194         /* use same message size as in ssl3_get_certificate_request()
1195          * as ServerKeyExchange message may be skipped */
1196         n=s->method->ssl_get_message(s,
1197                 SSL3_ST_CR_KEY_EXCH_A,
1198                 SSL3_ST_CR_KEY_EXCH_B,
1199                 -1,
1200                 s->max_cert_list,
1201                 &ok);
1202         if (!ok) return((int)n);
1203
1204         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1205                 {
1206 #ifndef OPENSSL_NO_PSK
1207                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1208                    omitted if no identity hint is sent. Set
1209                    session->sess_cert anyway to avoid problems
1210                    later.*/
1211                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1212                         {
1213                         s->session->sess_cert=ssl_sess_cert_new();
1214                         if (s->ctx->psk_identity_hint)
1215                                 OPENSSL_free(s->ctx->psk_identity_hint);
1216                         s->ctx->psk_identity_hint = NULL;
1217                         }
1218 #endif
1219                 s->s3->tmp.reuse_message=1;
1220                 return(1);
1221                 }
1222
1223         param=p=(unsigned char *)s->init_msg;
1224         if (s->session->sess_cert != NULL)
1225                 {
1226 #ifndef OPENSSL_NO_RSA
1227                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1228                         {
1229                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1230                         s->session->sess_cert->peer_rsa_tmp=NULL;
1231                         }
1232 #endif
1233 #ifndef OPENSSL_NO_DH
1234                 if (s->session->sess_cert->peer_dh_tmp)
1235                         {
1236                         DH_free(s->session->sess_cert->peer_dh_tmp);
1237                         s->session->sess_cert->peer_dh_tmp=NULL;
1238                         }
1239 #endif
1240 #ifndef OPENSSL_NO_ECDH
1241                 if (s->session->sess_cert->peer_ecdh_tmp)
1242                         {
1243                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1244                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1245                         }
1246 #endif
1247                 }
1248         else
1249                 {
1250                 s->session->sess_cert=ssl_sess_cert_new();
1251                 }
1252
1253         param_len=0;
1254         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1255         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1256         EVP_MD_CTX_init(&md_ctx);
1257
1258 #ifndef OPENSSL_NO_PSK
1259         if (alg_k & SSL_kPSK)
1260                 {
1261                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1262
1263                 al=SSL_AD_HANDSHAKE_FAILURE;
1264                 n2s(p,i);
1265                 param_len=i+2;
1266                 /* Store PSK identity hint for later use, hint is used
1267                  * in ssl3_send_client_key_exchange.  Assume that the
1268                  * maximum length of a PSK identity hint can be as
1269                  * long as the maximum length of a PSK identity. */
1270                 if (i > PSK_MAX_IDENTITY_LEN)
1271                         {
1272                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1273                                 SSL_R_DATA_LENGTH_TOO_LONG);
1274                         goto f_err;
1275                         }
1276                 if (param_len > n)
1277                         {
1278                         al=SSL_AD_DECODE_ERROR;
1279                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1280                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1281                         goto f_err;
1282                         }
1283                 /* If received PSK identity hint contains NULL
1284                  * characters, the hint is truncated from the first
1285                  * NULL. p may not be ending with NULL, so create a
1286                  * NULL-terminated string. */
1287                 memcpy(tmp_id_hint, p, i);
1288                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1289                 if (s->ctx->psk_identity_hint != NULL)
1290                         OPENSSL_free(s->ctx->psk_identity_hint);
1291                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1292                 if (s->ctx->psk_identity_hint == NULL)
1293                         {
1294                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1295                         goto f_err;
1296                         }
1297
1298                 p+=i;
1299                 n-=param_len;
1300                 }
1301         else
1302 #endif /* !OPENSSL_NO_PSK */
1303 #ifndef OPENSSL_NO_RSA
1304         if (alg_k & SSL_kRSA)
1305                 {
1306                 if ((rsa=RSA_new()) == NULL)
1307                         {
1308                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1309                         goto err;
1310                         }
1311                 n2s(p,i);
1312                 param_len=i+2;
1313                 if (param_len > n)
1314                         {
1315                         al=SSL_AD_DECODE_ERROR;
1316                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1317                         goto f_err;
1318                         }
1319                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1320                         {
1321                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1322                         goto err;
1323                         }
1324                 p+=i;
1325
1326                 n2s(p,i);
1327                 param_len+=i+2;
1328                 if (param_len > n)
1329                         {
1330                         al=SSL_AD_DECODE_ERROR;
1331                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1332                         goto f_err;
1333                         }
1334                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1335                         {
1336                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1337                         goto err;
1338                         }
1339                 p+=i;
1340                 n-=param_len;
1341
1342                 /* this should be because we are using an export cipher */
1343                 if (alg_a & SSL_aRSA)
1344                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1345                 else
1346                         {
1347                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1348                         goto err;
1349                         }
1350                 s->session->sess_cert->peer_rsa_tmp=rsa;
1351                 rsa=NULL;
1352                 }
1353 #else /* OPENSSL_NO_RSA */
1354         if (0)
1355                 ;
1356 #endif
1357 #ifndef OPENSSL_NO_DH
1358         else if (alg_k & SSL_kEDH)
1359                 {
1360                 if ((dh=DH_new()) == NULL)
1361                         {
1362                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1363                         goto err;
1364                         }
1365                 n2s(p,i);
1366                 param_len=i+2;
1367                 if (param_len > n)
1368                         {
1369                         al=SSL_AD_DECODE_ERROR;
1370                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1371                         goto f_err;
1372                         }
1373                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1374                         {
1375                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1376                         goto err;
1377                         }
1378                 p+=i;
1379
1380                 n2s(p,i);
1381                 param_len+=i+2;
1382                 if (param_len > n)
1383                         {
1384                         al=SSL_AD_DECODE_ERROR;
1385                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1386                         goto f_err;
1387                         }
1388                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1389                         {
1390                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1391                         goto err;
1392                         }
1393                 p+=i;
1394
1395                 n2s(p,i);
1396                 param_len+=i+2;
1397                 if (param_len > n)
1398                         {
1399                         al=SSL_AD_DECODE_ERROR;
1400                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1401                         goto f_err;
1402                         }
1403                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1404                         {
1405                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1406                         goto err;
1407                         }
1408                 p+=i;
1409                 n-=param_len;
1410
1411 #ifndef OPENSSL_NO_RSA
1412                 if (alg_a & SSL_aRSA)
1413                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1414 #else
1415                 if (0)
1416                         ;
1417 #endif
1418 #ifndef OPENSSL_NO_DSA
1419                 else if (alg_a & SSL_aDSS)
1420                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1421 #endif
1422                 /* else anonymous DH, so no certificate or pkey. */
1423
1424                 s->session->sess_cert->peer_dh_tmp=dh;
1425                 dh=NULL;
1426                 }
1427         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1428                 {
1429                 al=SSL_AD_ILLEGAL_PARAMETER;
1430                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1431                 goto f_err;
1432                 }
1433 #endif /* !OPENSSL_NO_DH */
1434
1435 #ifndef OPENSSL_NO_ECDH
1436         else if (alg_k & SSL_kEECDH)
1437                 {
1438                 EC_GROUP *ngroup;
1439                 const EC_GROUP *group;
1440
1441                 if ((ecdh=EC_KEY_new()) == NULL)
1442                         {
1443                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1444                         goto err;
1445                         }
1446
1447                 /* Extract elliptic curve parameters and the
1448                  * server's ephemeral ECDH public key.
1449                  * Keep accumulating lengths of various components in
1450                  * param_len and make sure it never exceeds n.
1451                  */
1452
1453                 /* XXX: For now we only support named (not generic) curves
1454                  * and the ECParameters in this case is just three bytes.
1455                  */
1456                 param_len=3;
1457                 if ((param_len > n) ||
1458                     (*p != NAMED_CURVE_TYPE) ||
1459                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1460                         {
1461                         al=SSL_AD_INTERNAL_ERROR;
1462                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1463                         goto f_err;
1464                         }
1465
1466                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1467                 if (ngroup == NULL)
1468                         {
1469                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1470                         goto err;
1471                         }
1472                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1473                         {
1474                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1475                         goto err;
1476                         }
1477                 EC_GROUP_free(ngroup);
1478
1479                 group = EC_KEY_get0_group(ecdh);
1480
1481                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1482                     (EC_GROUP_get_degree(group) > 163))
1483                         {
1484                         al=SSL_AD_EXPORT_RESTRICTION;
1485                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1486                         goto f_err;
1487                         }
1488
1489                 p+=3;
1490
1491                 /* Next, get the encoded ECPoint */
1492                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1493                     ((bn_ctx = BN_CTX_new()) == NULL))
1494                         {
1495                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1496                         goto err;
1497                         }
1498
1499                 encoded_pt_len = *p;  /* length of encoded point */
1500                 p+=1;
1501                 param_len += (1 + encoded_pt_len);
1502                 if ((param_len > n) ||
1503                     (EC_POINT_oct2point(group, srvr_ecpoint,
1504                         p, encoded_pt_len, bn_ctx) == 0))
1505                         {
1506                         al=SSL_AD_DECODE_ERROR;
1507                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1508                         goto f_err;
1509                         }
1510
1511                 n-=param_len;
1512                 p+=encoded_pt_len;
1513
1514                 /* The ECC/TLS specification does not mention
1515                  * the use of DSA to sign ECParameters in the server
1516                  * key exchange message. We do support RSA and ECDSA.
1517                  */
1518                 if (0) ;
1519 #ifndef OPENSSL_NO_RSA
1520                 else if (alg_a & SSL_aRSA)
1521                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1522 #endif
1523 #ifndef OPENSSL_NO_ECDSA
1524                 else if (alg_a & SSL_aECDSA)
1525                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1526 #endif
1527                 /* else anonymous ECDH, so no certificate or pkey. */
1528                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1529                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1530                 ecdh=NULL;
1531                 BN_CTX_free(bn_ctx);
1532                 bn_ctx = NULL;
1533                 EC_POINT_free(srvr_ecpoint);
1534                 srvr_ecpoint = NULL;
1535                 }
1536         else if (alg_k)
1537                 {
1538                 al=SSL_AD_UNEXPECTED_MESSAGE;
1539                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1540                 goto f_err;
1541                 }
1542 #endif /* !OPENSSL_NO_ECDH */
1543
1544
1545         /* p points to the next byte, there are 'n' bytes left */
1546
1547         /* if it was signed, check the signature */
1548         if (pkey != NULL)
1549                 {
1550                 n2s(p,i);
1551                 n-=2;
1552                 j=EVP_PKEY_size(pkey);
1553
1554                 if ((i != n) || (n > j) || (n <= 0))
1555                         {
1556                         /* wrong packet length */
1557                         al=SSL_AD_DECODE_ERROR;
1558                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1559                         goto f_err;
1560                         }
1561
1562 #ifndef OPENSSL_NO_RSA
1563                 if (pkey->type == EVP_PKEY_RSA)
1564                         {
1565                         int num;
1566
1567                         j=0;
1568                         q=md_buf;
1569                         for (num=2; num > 0; num--)
1570                                 {
1571                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1572                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1573                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1574                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1575                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1576                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1577                                 q+=i;
1578                                 j+=i;
1579                                 }
1580                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1581                                                                 pkey->pkey.rsa);
1582                         if (i < 0)
1583                                 {
1584                                 al=SSL_AD_DECRYPT_ERROR;
1585                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1586                                 goto f_err;
1587                                 }
1588                         if (i == 0)
1589                                 {
1590                                 /* bad signature */
1591                                 al=SSL_AD_DECRYPT_ERROR;
1592                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1593                                 goto f_err;
1594                                 }
1595                         }
1596                 else
1597 #endif
1598 #ifndef OPENSSL_NO_DSA
1599                         if (pkey->type == EVP_PKEY_DSA)
1600                         {
1601                         /* lets do DSS */
1602                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1603                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1604                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1605                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1606                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1607                                 {
1608                                 /* bad signature */
1609                                 al=SSL_AD_DECRYPT_ERROR;
1610                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1611                                 goto f_err;
1612                                 }
1613                         }
1614                 else
1615 #endif
1616 #ifndef OPENSSL_NO_ECDSA
1617                         if (pkey->type == EVP_PKEY_EC)
1618                         {
1619                         /* let's do ECDSA */
1620                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1621                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1622                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1623                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1624                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1625                                 {
1626                                 /* bad signature */
1627                                 al=SSL_AD_DECRYPT_ERROR;
1628                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1629                                 goto f_err;
1630                                 }
1631                         }
1632                 else
1633 #endif
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1636                         goto err;
1637                         }
1638                 }
1639         else
1640                 {
1641                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1642                         /* aNULL or kPSK do not need public keys */
1643                         {
1644                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1645                         goto err;
1646                         }
1647                 /* still data left over */
1648                 if (n != 0)
1649                         {
1650                         al=SSL_AD_DECODE_ERROR;
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1652                         goto f_err;
1653                         }
1654                 }
1655         EVP_PKEY_free(pkey);
1656         EVP_MD_CTX_cleanup(&md_ctx);
1657         return(1);
1658 f_err:
1659         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1660 err:
1661         EVP_PKEY_free(pkey);
1662 #ifndef OPENSSL_NO_RSA
1663         if (rsa != NULL)
1664                 RSA_free(rsa);
1665 #endif
1666 #ifndef OPENSSL_NO_DH
1667         if (dh != NULL)
1668                 DH_free(dh);
1669 #endif
1670 #ifndef OPENSSL_NO_ECDH
1671         BN_CTX_free(bn_ctx);
1672         EC_POINT_free(srvr_ecpoint);
1673         if (ecdh != NULL)
1674                 EC_KEY_free(ecdh);
1675 #endif
1676         EVP_MD_CTX_cleanup(&md_ctx);
1677         return(-1);
1678         }
1679
1680 int ssl3_get_certificate_request(SSL *s)
1681         {
1682         int ok,ret=0;
1683         unsigned long n,nc,l;
1684         unsigned int llen,ctype_num,i;
1685         X509_NAME *xn=NULL;
1686         const unsigned char *p,*q;
1687         unsigned char *d;
1688         STACK_OF(X509_NAME) *ca_sk=NULL;
1689
1690         n=s->method->ssl_get_message(s,
1691                 SSL3_ST_CR_CERT_REQ_A,
1692                 SSL3_ST_CR_CERT_REQ_B,
1693                 -1,
1694                 s->max_cert_list,
1695                 &ok);
1696
1697         if (!ok) return((int)n);
1698
1699         s->s3->tmp.cert_req=0;
1700
1701         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1702                 {
1703                 s->s3->tmp.reuse_message=1;
1704                 return(1);
1705                 }
1706
1707         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1708                 {
1709                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1710                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1711                 goto err;
1712                 }
1713
1714         /* TLS does not like anon-DH with client cert */
1715         if (s->version > SSL3_VERSION)
1716                 {
1717                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1718                         {
1719                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1720                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1721                         goto err;
1722                         }
1723                 }
1724
1725         p=d=(unsigned char *)s->init_msg;
1726
1727         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1728                 {
1729                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1730                 goto err;
1731                 }
1732
1733         /* get the certificate types */
1734         ctype_num= *(p++);
1735         if (ctype_num > SSL3_CT_NUMBER)
1736                 ctype_num=SSL3_CT_NUMBER;
1737         for (i=0; i<ctype_num; i++)
1738                 s->s3->tmp.ctype[i]= p[i];
1739         p+=ctype_num;
1740
1741         /* get the CA RDNs */
1742         n2s(p,llen);
1743 #if 0
1744 {
1745 FILE *out;
1746 out=fopen("/tmp/vsign.der","w");
1747 fwrite(p,1,llen,out);
1748 fclose(out);
1749 }
1750 #endif
1751
1752         if ((llen+ctype_num+2+1) != n)
1753                 {
1754                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1755                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1756                 goto err;
1757                 }
1758
1759         for (nc=0; nc<llen; )
1760                 {
1761                 n2s(p,l);
1762                 if ((l+nc+2) > llen)
1763                         {
1764                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1765                                 goto cont; /* netscape bugs */
1766                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1767                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1768                         goto err;
1769                         }
1770
1771                 q=p;
1772
1773                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1774                         {
1775                         /* If netscape tolerance is on, ignore errors */
1776                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1777                                 goto cont;
1778                         else
1779                                 {
1780                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1781                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1782                                 goto err;
1783                                 }
1784                         }
1785
1786                 if (q != (p+l))
1787                         {
1788                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1789                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1790                         goto err;
1791                         }
1792                 if (!sk_X509_NAME_push(ca_sk,xn))
1793                         {
1794                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1795                         goto err;
1796                         }
1797
1798                 p+=l;
1799                 nc+=l+2;
1800                 }
1801
1802         if (0)
1803                 {
1804 cont:
1805                 ERR_clear_error();
1806                 }
1807
1808         /* we should setup a certificate to return.... */
1809         s->s3->tmp.cert_req=1;
1810         s->s3->tmp.ctype_num=ctype_num;
1811         if (s->s3->tmp.ca_names != NULL)
1812                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1813         s->s3->tmp.ca_names=ca_sk;
1814         ca_sk=NULL;
1815
1816         ret=1;
1817 err:
1818         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1819         return(ret);
1820         }
1821
1822 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1823         {
1824         return(X509_NAME_cmp(*a,*b));
1825         }
1826 #ifndef OPENSSL_NO_TLSEXT
1827 int ssl3_get_new_session_ticket(SSL *s)
1828         {
1829         int ok,al,ret=0, ticklen;
1830         long n;
1831         const unsigned char *p;
1832         unsigned char *d;
1833
1834         n=s->method->ssl_get_message(s,
1835                 SSL3_ST_CR_SESSION_TICKET_A,
1836                 SSL3_ST_CR_SESSION_TICKET_B,
1837                 -1,
1838                 16384,
1839                 &ok);
1840
1841         if (!ok)
1842                 return((int)n);
1843
1844         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1845                 {
1846                 s->s3->tmp.reuse_message=1;
1847                 return(1);
1848                 }
1849         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1850                 {
1851                 al=SSL_AD_UNEXPECTED_MESSAGE;
1852                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1853                 goto f_err;
1854                 }
1855         if (n < 6)
1856                 {
1857                 /* need at least ticket_lifetime_hint + ticket length */
1858                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1859                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1860                 goto f_err;
1861                 }
1862
1863         p=d=(unsigned char *)s->init_msg;
1864         n2l(p, s->session->tlsext_tick_lifetime_hint);
1865         n2s(p, ticklen);
1866         /* ticket_lifetime_hint + ticket_length + ticket */
1867         if (ticklen + 6 != n)
1868                 {
1869                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1870                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1871                 goto f_err;
1872                 }
1873         if (s->session->tlsext_tick)
1874                 {
1875                 OPENSSL_free(s->session->tlsext_tick);
1876                 s->session->tlsext_ticklen = 0;
1877                 }
1878         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1879         if (!s->session->tlsext_tick)
1880                 {
1881                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1882                 goto err;
1883                 }
1884         memcpy(s->session->tlsext_tick, p, ticklen);
1885         s->session->tlsext_ticklen = ticklen;
1886         /* There are two ways to detect a resumed ticket sesion.
1887          * One is to set an appropriate session ID and then the server
1888          * must return a match in ServerHello. This allows the normal
1889          * client session ID matching to work and we know much
1890          * earlier that the ticket has been accepted.
1891          *
1892          * The other way is to set zero length session ID when the
1893          * ticket is presented and rely on the handshake to determine
1894          * session resumption.
1895          *
1896          * We choose the former approach because this fits in with
1897          * assumptions elsewhere in OpenSSL. The session ID is set
1898          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1899          * ticket.
1900          */
1901         EVP_Digest(p, ticklen,
1902                         s->session->session_id, &s->session->session_id_length,
1903 #ifndef OPENSSL_NO_SHA256
1904                                                         EVP_sha256(), NULL);
1905 #else
1906                                                         EVP_sha1(), NULL);
1907 #endif
1908         ret=1;
1909         return(ret);
1910 f_err:
1911         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1912 err:
1913         return(-1);
1914         }
1915
1916 int ssl3_get_cert_status(SSL *s)
1917         {
1918         int ok, al;
1919         unsigned long resplen,n;
1920         const unsigned char *p;
1921
1922         n=s->method->ssl_get_message(s,
1923                 SSL3_ST_CR_CERT_STATUS_A,
1924                 SSL3_ST_CR_CERT_STATUS_B,
1925                 SSL3_MT_CERTIFICATE_STATUS,
1926                 16384,
1927                 &ok);
1928
1929         if (!ok) return((int)n);
1930         if (n < 4)
1931                 {
1932                 /* need at least status type + length */
1933                 al = SSL_AD_DECODE_ERROR;
1934                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1935                 goto f_err;
1936                 }
1937         p = (unsigned char *)s->init_msg;
1938         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1939                 {
1940                 al = SSL_AD_DECODE_ERROR;
1941                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1942                 goto f_err;
1943                 }
1944         n2l3(p, resplen);
1945         if (resplen + 4 != n)
1946                 {
1947                 al = SSL_AD_DECODE_ERROR;
1948                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1949                 goto f_err;
1950                 }
1951         if (s->tlsext_ocsp_resp)
1952                 OPENSSL_free(s->tlsext_ocsp_resp);
1953         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1954         if (!s->tlsext_ocsp_resp)
1955                 {
1956                 al = SSL_AD_INTERNAL_ERROR;
1957                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1958                 goto f_err;
1959                 }
1960         s->tlsext_ocsp_resplen = resplen;
1961         if (s->ctx->tlsext_status_cb)
1962                 {
1963                 int ret;
1964                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1965                 if (ret == 0)
1966                         {
1967                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1968                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1969                         goto f_err;
1970                         }
1971                 if (ret < 0)
1972                         {
1973                         al = SSL_AD_INTERNAL_ERROR;
1974                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1975                         goto f_err;
1976                         }
1977                 }
1978         return 1;
1979 f_err:
1980         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1981         return(-1);
1982         }
1983 #endif
1984
1985 int ssl3_get_server_done(SSL *s)
1986         {
1987         int ok,ret=0;
1988         long n;
1989
1990         n=s->method->ssl_get_message(s,
1991                 SSL3_ST_CR_SRVR_DONE_A,
1992                 SSL3_ST_CR_SRVR_DONE_B,
1993                 SSL3_MT_SERVER_DONE,
1994                 30, /* should be very small, like 0 :-) */
1995                 &ok);
1996
1997         if (!ok) return((int)n);
1998         if (n > 0)
1999                 {
2000                 /* should contain no data */
2001                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2002                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2003                 return -1;
2004                 }
2005         ret=1;
2006         return(ret);
2007         }
2008
2009
2010 int ssl3_send_client_key_exchange(SSL *s)
2011         {
2012         unsigned char *p,*d;
2013         int n;
2014         unsigned long alg_k;
2015 #ifndef OPENSSL_NO_RSA
2016         unsigned char *q;
2017         EVP_PKEY *pkey=NULL;
2018 #endif
2019 #ifndef OPENSSL_NO_KRB5
2020         KSSL_ERR kssl_err;
2021 #endif /* OPENSSL_NO_KRB5 */
2022 #ifndef OPENSSL_NO_ECDH
2023         EC_KEY *clnt_ecdh = NULL;
2024         const EC_POINT *srvr_ecpoint = NULL;
2025         EVP_PKEY *srvr_pub_pkey = NULL;
2026         unsigned char *encodedPoint = NULL;
2027         int encoded_pt_len = 0;
2028         BN_CTX * bn_ctx = NULL;
2029 #endif
2030
2031         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2032                 {
2033                 d=(unsigned char *)s->init_buf->data;
2034                 p= &(d[4]);
2035
2036                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2037
2038                 /* Fool emacs indentation */
2039                 if (0) {}
2040 #ifndef OPENSSL_NO_RSA
2041                 else if (alg_k & SSL_kRSA)
2042                         {
2043                         RSA *rsa;
2044                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2045
2046                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2047                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2048                         else
2049                                 {
2050                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2051                                 if ((pkey == NULL) ||
2052                                         (pkey->type != EVP_PKEY_RSA) ||
2053                                         (pkey->pkey.rsa == NULL))
2054                                         {
2055                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2056                                         goto err;
2057                                         }
2058                                 rsa=pkey->pkey.rsa;
2059                                 EVP_PKEY_free(pkey);
2060                                 }
2061
2062                         tmp_buf[0]=s->client_version>>8;
2063                         tmp_buf[1]=s->client_version&0xff;
2064                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2065                                         goto err;
2066
2067                         s->session->master_key_length=sizeof tmp_buf;
2068
2069                         q=p;
2070                         /* Fix buf for TLS and beyond */
2071                         if (s->version > SSL3_VERSION)
2072                                 p+=2;
2073                         n=RSA_public_encrypt(sizeof tmp_buf,
2074                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2075 #ifdef PKCS1_CHECK
2076                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2077                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2078 #endif
2079                         if (n <= 0)
2080                                 {
2081                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2082                                 goto err;
2083                                 }
2084
2085                         /* Fix buf for TLS and beyond */
2086                         if (s->version > SSL3_VERSION)
2087                                 {
2088                                 s2n(n,q);
2089                                 n+=2;
2090                                 }
2091
2092                         s->session->master_key_length=
2093                                 s->method->ssl3_enc->generate_master_secret(s,
2094                                         s->session->master_key,
2095                                         tmp_buf,sizeof tmp_buf);
2096                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2097                         }
2098 #endif
2099 #ifndef OPENSSL_NO_KRB5
2100                 else if (alg_k & SSL_kKRB5)
2101                         {
2102                         krb5_error_code krb5rc;
2103                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2104                         /*  krb5_data   krb5_ap_req;  */
2105                         krb5_data       *enc_ticket;
2106                         krb5_data       authenticator, *authp = NULL;
2107                         EVP_CIPHER_CTX  ciph_ctx;
2108                         const EVP_CIPHER *enc = NULL;
2109                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2110                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2111                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2112                                                 + EVP_MAX_IV_LENGTH];
2113                         int             padl, outl = sizeof(epms);
2114
2115                         EVP_CIPHER_CTX_init(&ciph_ctx);
2116
2117 #ifdef KSSL_DEBUG
2118                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2119                                 alg_k, SSL_kKRB5);
2120 #endif  /* KSSL_DEBUG */
2121
2122                         authp = NULL;
2123 #ifdef KRB5SENDAUTH
2124                         if (KRB5SENDAUTH)  authp = &authenticator;
2125 #endif  /* KRB5SENDAUTH */
2126
2127                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2128                                 &kssl_err);
2129                         enc = kssl_map_enc(kssl_ctx->enctype);
2130                         if (enc == NULL)
2131                             goto err;
2132 #ifdef KSSL_DEBUG
2133                         {
2134                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2135                         if (krb5rc && kssl_err.text)
2136                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2137                         }
2138 #endif  /* KSSL_DEBUG */
2139
2140                         if (krb5rc)
2141                                 {
2142                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2143                                                 SSL_AD_HANDSHAKE_FAILURE);
2144                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2145                                                 kssl_err.reason);
2146                                 goto err;
2147                                 }
2148
2149                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2150                         **  in place of RFC 2712 KerberosWrapper, as in:
2151                         **
2152                         **  Send ticket (copy to *p, set n = length)
2153                         **  n = krb5_ap_req.length;
2154                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2155                         **  if (krb5_ap_req.data)
2156                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2157                         **
2158                         **  Now using real RFC 2712 KerberosWrapper
2159                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2160                         **  Note: 2712 "opaque" types are here replaced
2161                         **  with a 2-byte length followed by the value.
2162                         **  Example:
2163                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2164                         **  Where "xx xx" = length bytes.  Shown here with
2165                         **  optional authenticator omitted.
2166                         */
2167
2168                         /*  KerberosWrapper.Ticket              */
2169                         s2n(enc_ticket->length,p);
2170                         memcpy(p, enc_ticket->data, enc_ticket->length);
2171                         p+= enc_ticket->length;
2172                         n = enc_ticket->length + 2;
2173
2174                         /*  KerberosWrapper.Authenticator       */
2175                         if (authp  &&  authp->length)
2176                                 {
2177                                 s2n(authp->length,p);
2178                                 memcpy(p, authp->data, authp->length);
2179                                 p+= authp->length;
2180                                 n+= authp->length + 2;
2181
2182                                 free(authp->data);
2183                                 authp->data = NULL;
2184                                 authp->length = 0;
2185                                 }
2186                         else
2187                                 {
2188                                 s2n(0,p);/*  null authenticator length  */
2189                                 n+=2;
2190                                 }
2191
2192                             tmp_buf[0]=s->client_version>>8;
2193                             tmp_buf[1]=s->client_version&0xff;
2194                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2195                                 goto err;
2196
2197                         /*  20010420 VRS.  Tried it this way; failed.
2198                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2199                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2200                         **                              kssl_ctx->length);
2201                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2202                         */
2203
2204                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2205                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2206                                 kssl_ctx->key,iv);
2207                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2208                                 sizeof tmp_buf);
2209                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2210                         outl += padl;
2211                         if (outl > (int)sizeof epms)
2212                                 {
2213                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2214                                 goto err;
2215                                 }
2216                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2217
2218                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2219                         s2n(outl,p);
2220                         memcpy(p, epms, outl);
2221                         p+=outl;
2222                         n+=outl + 2;
2223
2224                         s->session->master_key_length=
2225                                 s->method->ssl3_enc->generate_master_secret(s,
2226                                         s->session->master_key,
2227                                         tmp_buf, sizeof tmp_buf);
2228
2229                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2230                         OPENSSL_cleanse(epms, outl);
2231                         }
2232 #endif
2233 #ifndef OPENSSL_NO_DH
2234                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2235                         {
2236                         DH *dh_srvr,*dh_clnt;
2237
2238                         if (s->session->sess_cert == NULL)
2239                                 {
2240                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2241                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2242                                 goto err;
2243                                 }
2244
2245                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2246                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2247                         else
2248                                 {
2249                                 /* we get them from the cert */
2250                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2251                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2252                                 goto err;
2253                                 }
2254
2255                         /* generate a new random key */
2256                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2257                                 {
2258                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2259                                 goto err;
2260                                 }
2261                         if (!DH_generate_key(dh_clnt))
2262                                 {
2263                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2264                                 goto err;
2265                                 }
2266
2267                         /* use the 'p' output buffer for the DH key, but
2268                          * make sure to clear it out afterwards */
2269
2270                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2271
2272                         if (n <= 0)
2273                                 {
2274                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2275                                 goto err;
2276                                 }
2277
2278                         /* generate master key from the result */
2279                         s->session->master_key_length=
2280                                 s->method->ssl3_enc->generate_master_secret(s,
2281                                         s->session->master_key,p,n);
2282                         /* clean up */
2283                         memset(p,0,n);
2284
2285                         /* send off the data */
2286                         n=BN_num_bytes(dh_clnt->pub_key);
2287                         s2n(n,p);
2288                         BN_bn2bin(dh_clnt->pub_key,p);
2289                         n+=2;
2290
2291                         DH_free(dh_clnt);
2292
2293                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2294                         }
2295 #endif
2296
2297 #ifndef OPENSSL_NO_ECDH
2298                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2299                         {
2300                         const EC_GROUP *srvr_group = NULL;
2301                         EC_KEY *tkey;
2302                         int ecdh_clnt_cert = 0;
2303                         int field_size = 0;
2304
2305                         /* Did we send out the client's
2306                          * ECDH share for use in premaster
2307                          * computation as part of client certificate?
2308                          * If so, set ecdh_clnt_cert to 1.
2309                          */
2310                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2311                                 {
2312                                 /* XXX: For now, we do not support client
2313                                  * authentication using ECDH certificates.
2314                                  * To add such support, one needs to add
2315                                  * code that checks for appropriate
2316                                  * conditions and sets ecdh_clnt_cert to 1.
2317                                  * For example, the cert have an ECC
2318                                  * key on the same curve as the server's
2319                                  * and the key should be authorized for
2320                                  * key agreement.
2321                                  *
2322                                  * One also needs to add code in ssl3_connect
2323                                  * to skip sending the certificate verify
2324                                  * message.
2325                                  *
2326                                  * if ((s->cert->key->privatekey != NULL) &&
2327                                  *     (s->cert->key->privatekey->type ==
2328                                  *      EVP_PKEY_EC) && ...)
2329                                  * ecdh_clnt_cert = 1;
2330                                  */
2331                                 }
2332
2333                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2334                                 {
2335                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2336                                 }
2337                         else
2338                                 {
2339                                 /* Get the Server Public Key from Cert */
2340                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2341                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2342                                 if ((srvr_pub_pkey == NULL) ||
2343                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2344                                     (srvr_pub_pkey->pkey.ec == NULL))
2345                                         {
2346                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2347                                             ERR_R_INTERNAL_ERROR);
2348                                         goto err;
2349                                         }
2350
2351                                 tkey = srvr_pub_pkey->pkey.ec;
2352                                 }
2353
2354                         srvr_group   = EC_KEY_get0_group(tkey);
2355                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2356
2357                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2358                                 {
2359                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2360                                     ERR_R_INTERNAL_ERROR);
2361                                 goto err;
2362                                 }
2363
2364                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2365                                 {
2366                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2367                                 goto err;
2368                                 }
2369
2370                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2371                                 {
2372                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2373                                 goto err;
2374                                 }
2375                         if (ecdh_clnt_cert)
2376                                 {
2377                                 /* Reuse key info from our certificate
2378                                  * We only need our private key to perform
2379                                  * the ECDH computation.
2380                                  */
2381                                 const BIGNUM *priv_key;
2382                                 tkey = s->cert->key->privatekey->pkey.ec;
2383                                 priv_key = EC_KEY_get0_private_key(tkey);
2384                                 if (priv_key == NULL)
2385                                         {
2386                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2387                                         goto err;
2388                                         }
2389                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2390                                         {
2391                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2392                                         goto err;
2393                                         }
2394                                 }
2395                         else
2396                                 {
2397                                 /* Generate a new ECDH key pair */
2398                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2399                                         {
2400                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2401                                         goto err;
2402                                         }
2403                                 }
2404
2405                         /* use the 'p' output buffer for the ECDH key, but
2406                          * make sure to clear it out afterwards
2407                          */
2408
2409                         field_size = EC_GROUP_get_degree(srvr_group);
2410                         if (field_size <= 0)
2411                                 {
2412                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2413                                        ERR_R_ECDH_LIB);
2414                                 goto err;
2415                                 }
2416                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2417                         if (n <= 0)
2418                                 {
2419                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2420                                        ERR_R_ECDH_LIB);
2421                                 goto err;
2422                                 }
2423
2424                         /* generate master key from the result */
2425                         s->session->master_key_length = s->method->ssl3_enc \
2426                             -> generate_master_secret(s,
2427                                 s->session->master_key,
2428                                 p, n);
2429
2430                         memset(p, 0, n); /* clean up */
2431
2432                         if (ecdh_clnt_cert)
2433                                 {
2434                                 /* Send empty client key exch message */
2435                                 n = 0;
2436                                 }
2437                         else
2438                                 {
2439                                 /* First check the size of encoding and
2440                                  * allocate memory accordingly.
2441                                  */
2442                                 encoded_pt_len =
2443                                     EC_POINT_point2oct(srvr_group,
2444                                         EC_KEY_get0_public_key(clnt_ecdh),
2445                                         POINT_CONVERSION_UNCOMPRESSED,
2446                                         NULL, 0, NULL);
2447
2448                                 encodedPoint = (unsigned char *)
2449                                     OPENSSL_malloc(encoded_pt_len *
2450                                         sizeof(unsigned char));
2451                                 bn_ctx = BN_CTX_new();
2452                                 if ((encodedPoint == NULL) ||
2453                                     (bn_ctx == NULL))
2454                                         {
2455                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2456                                         goto err;
2457                                         }
2458
2459                                 /* Encode the public key */
2460                                 n = EC_POINT_point2oct(srvr_group,
2461                                     EC_KEY_get0_public_key(clnt_ecdh),
2462                                     POINT_CONVERSION_UNCOMPRESSED,
2463                                     encodedPoint, encoded_pt_len, bn_ctx);
2464
2465                                 *p = n; /* length of encoded point */
2466                                 /* Encoded point will be copied here */
2467                                 p += 1;
2468                                 /* copy the point */
2469                                 memcpy((unsigned char *)p, encodedPoint, n);
2470                                 /* increment n to account for length field */
2471                                 n += 1;
2472                                 }
2473
2474                         /* Free allocated memory */
2475                         BN_CTX_free(bn_ctx);
2476                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2477                         if (clnt_ecdh != NULL)
2478                                  EC_KEY_free(clnt_ecdh);
2479                         EVP_PKEY_free(srvr_pub_pkey);
2480                         }
2481 #endif /* !OPENSSL_NO_ECDH */
2482                 else if (alg_k & SSL_kGOST)
2483                         {
2484                         /* GOST key exchange message creation */
2485                         EVP_PKEY_CTX *pkey_ctx;
2486                         X509 *peer_cert;
2487                         size_t msglen;
2488                         unsigned int md_len;
2489                         int keytype;
2490                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2491                         EVP_MD_CTX *ukm_hash;
2492                         EVP_PKEY *pub_key;
2493
2494                         /* Get server sertificate PKEY and create ctx from it */
2495                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2496                         if (!peer_cert)
2497                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2498                         if (!peer_cert)         {
2499                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2500                                         goto err;
2501                                 }
2502
2503                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2504                         /* If we have send a certificate, and certificate key
2505
2506                          * parameters match those of server certificate, use
2507                          * certificate key for key exchange
2508                          */
2509
2510                          /* Otherwise, generate ephemeral key pair */
2511
2512                         EVP_PKEY_encrypt_init(pkey_ctx);
2513                           /* Generate session key */
2514                     RAND_bytes(premaster_secret,32);
2515                         /* If we have client certificate, use its secret as peer key */
2516                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2517                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2518                                         /* If there was an error - just ignore it. Ephemeral key
2519                                         * would be used
2520                                         */
2521                                         ERR_clear_error();
2522                                 }
2523                         }
2524                         /* Compute shared IV and store it in algorithm-specific
2525                          * context data */
2526                         ukm_hash = EVP_MD_CTX_create();
2527                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2528                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2529                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2530                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2531                         EVP_MD_CTX_destroy(ukm_hash);
2532                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2533                                 8,shared_ukm)<0) {
2534                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2535                                                 SSL_R_LIBRARY_BUG);
2536                                         goto err;
2537                                 }
2538                         /* Make GOST keytransport blob message */
2539                         /*Encapsulate it into sequence */
2540                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2541                         msglen=255;
2542                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2543                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2544                                         SSL_R_LIBRARY_BUG);
2545                                 goto err;
2546                         }
2547                         if (msglen >= 0x80)
2548                                 {
2549                                 *(p++)=0x81;
2550                                 *(p++)= msglen & 0xff;
2551                                 n=msglen+3;
2552                                 }
2553                         else
2554                                 {
2555                                 *(p++)= msglen & 0xff;
2556                                 n=msglen+2;
2557                                 }
2558                         memcpy(p, tmp, msglen);
2559                         /* Check if pubkey from client certificate was used */
2560                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2561                                 {
2562                                 /* Set flag "skip certificate verify" */
2563                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2564                                 }
2565                         EVP_PKEY_CTX_free(pkey_ctx);
2566                         s->session->master_key_length=
2567                                 s->method->ssl3_enc->generate_master_secret(s,
2568                                         s->session->master_key,premaster_secret,32);
2569                         EVP_PKEY_free(pub_key);
2570
2571                         }
2572 #ifndef OPENSSL_NO_PSK
2573                 else if (alg_k & SSL_kPSK)
2574                         {
2575                         char identity[PSK_MAX_IDENTITY_LEN];
2576                         unsigned char *t = NULL;
2577                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2578                         unsigned int pre_ms_len = 0, psk_len = 0;
2579                         int psk_err = 1;
2580
2581                         n = 0;
2582                         if (s->psk_client_callback == NULL)
2583                                 {
2584                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2585                                         SSL_R_PSK_NO_CLIENT_CB);
2586                                 goto err;
2587                                 }
2588
2589                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2590                                 identity, PSK_MAX_IDENTITY_LEN,
2591                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2592                         if (psk_len > PSK_MAX_PSK_LEN)
2593                                 {
2594                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2595                                         ERR_R_INTERNAL_ERROR);
2596                                 goto psk_err;
2597                                 }
2598                         else if (psk_len == 0)
2599                                 {
2600                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2601                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2602                                 goto psk_err;
2603                                 }
2604
2605                         /* create PSK pre_master_secret */
2606                         pre_ms_len = 2+psk_len+2+psk_len;
2607                         t = psk_or_pre_ms;
2608                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2609                         s2n(psk_len, t);
2610                         memset(t, 0, psk_len);
2611                         t+=psk_len;
2612                         s2n(psk_len, t);
2613
2614                         if (s->session->psk_identity_hint != NULL)
2615                                 OPENSSL_free(s->session->psk_identity_hint);
2616                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2617                         if (s->ctx->psk_identity_hint != NULL &&
2618                                 s->session->psk_identity_hint == NULL)
2619                                 {
2620                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2621                                         ERR_R_MALLOC_FAILURE);
2622                                 goto psk_err;
2623                                 }
2624
2625                         if (s->session->psk_identity != NULL)
2626                                 OPENSSL_free(s->session->psk_identity);
2627                         s->session->psk_identity = BUF_strdup(identity);
2628                         if (s->session->psk_identity == NULL)
2629                                 {
2630                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2631                                         ERR_R_MALLOC_FAILURE);
2632                                 goto psk_err;
2633                                 }
2634
2635                         s->session->master_key_length =
2636                                 s->method->ssl3_enc->generate_master_secret(s,
2637                                         s->session->master_key,
2638                                         psk_or_pre_ms, pre_ms_len);
2639                         n = strlen(identity);
2640                         s2n(n, p);
2641                         memcpy(p, identity, n);
2642                         n+=2;
2643                         psk_err = 0;
2644                 psk_err:
2645                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2646                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2647                         if (psk_err != 0)
2648                                 {
2649                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2650                                 goto err;
2651                                 }
2652                         }
2653 #endif
2654                 else
2655                         {
2656                         ssl3_send_alert(s, SSL3_AL_FATAL,
2657                             SSL_AD_HANDSHAKE_FAILURE);
2658                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2659                             ERR_R_INTERNAL_ERROR);
2660                         goto err;
2661                         }
2662
2663                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2664                 l2n3(n,d);
2665
2666                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2667                 /* number of bytes to write */
2668                 s->init_num=n+4;
2669                 s->init_off=0;
2670                 }
2671
2672         /* SSL3_ST_CW_KEY_EXCH_B */
2673         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2674 err:
2675 #ifndef OPENSSL_NO_ECDH
2676         BN_CTX_free(bn_ctx);
2677         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2678         if (clnt_ecdh != NULL)
2679                 EC_KEY_free(clnt_ecdh);
2680         EVP_PKEY_free(srvr_pub_pkey);
2681 #endif
2682         return(-1);
2683         }
2684
2685 int ssl3_send_client_verify(SSL *s)
2686         {
2687         unsigned char *p,*d;
2688         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2689         EVP_PKEY *pkey;
2690         EVP_PKEY_CTX *pctx=NULL;
2691 #ifndef OPENSSL_NO_RSA
2692         unsigned u=0;
2693 #endif
2694         unsigned long n;
2695         int j;
2696
2697         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2698                 {
2699                 d=(unsigned char *)s->init_buf->data;
2700                 p= &(d[4]);
2701                 pkey=s->cert->key->privatekey;
2702 /* Create context from key and test if sha1 is allowed as digest */
2703                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2704                 EVP_PKEY_sign_init(pctx);
2705                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2706                         {
2707                         s->method->ssl3_enc->cert_verify_mac(s,
2708                                                 NID_sha1,
2709                                                 &(data[MD5_DIGEST_LENGTH]));
2710                         }
2711                 else
2712                         {
2713                         ERR_clear_error();
2714                         }
2715 #ifndef OPENSSL_NO_RSA
2716                 if (pkey->type == EVP_PKEY_RSA)
2717                         {
2718                         s->method->ssl3_enc->cert_verify_mac(s,
2719                                 NID_md5,
2720                                 &(data[0]));
2721                         if (RSA_sign(NID_md5_sha1, data,
2722                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2723                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2724                                 {
2725                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2726                                 goto err;
2727                                 }
2728                         s2n(u,p);
2729                         n=u+2;
2730                         }
2731                 else
2732 #endif
2733 #ifndef OPENSSL_NO_DSA
2734                         if (pkey->type == EVP_PKEY_DSA)
2735                         {
2736                         if (!DSA_sign(pkey->save_type,
2737                                 &(data[MD5_DIGEST_LENGTH]),
2738                                 SHA_DIGEST_LENGTH,&(p[2]),
2739                                 (unsigned int *)&j,pkey->pkey.dsa))
2740                                 {
2741                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2742                                 goto err;
2743                                 }
2744                         s2n(j,p);
2745                         n=j+2;
2746                         }
2747                 else
2748 #endif
2749 #ifndef OPENSSL_NO_ECDSA
2750                         if (pkey->type == EVP_PKEY_EC)
2751                         {
2752                         if (!ECDSA_sign(pkey->save_type,
2753                                 &(data[MD5_DIGEST_LENGTH]),
2754                                 SHA_DIGEST_LENGTH,&(p[2]),
2755                                 (unsigned int *)&j,pkey->pkey.ec))
2756                                 {
2757                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2758                                     ERR_R_ECDSA_LIB);
2759                                 goto err;
2760                                 }
2761                         s2n(j,p);
2762                         n=j+2;
2763                         }
2764                 else
2765 #endif
2766                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2767                 {
2768                 unsigned char signbuf[64];
2769                 int i;
2770                 size_t sigsize=64;
2771                 s->method->ssl3_enc->cert_verify_mac(s,
2772                         NID_id_GostR3411_94,
2773                         data);
2774                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2775                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2776                         ERR_R_INTERNAL_ERROR);
2777                         goto err;
2778                 }
2779                 for (i=63,j=0; i>=0; j++, i--) {
2780                         p[2+j]=signbuf[i];
2781                 }
2782                 s2n(j,p);
2783                 n=j+2;
2784                 }
2785                 else
2786                 {
2787                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2788                         goto err;
2789                 }
2790                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2791                 l2n3(n,d);
2792
2793                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2794                 s->init_num=(int)n+4;
2795                 s->init_off=0;
2796                 }
2797         EVP_PKEY_CTX_free(pctx);
2798         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2799 err:
2800         EVP_PKEY_CTX_free(pctx);
2801         return(-1);
2802         }
2803
2804 int ssl3_send_client_certificate(SSL *s)
2805         {
2806         X509 *x509=NULL;
2807         EVP_PKEY *pkey=NULL;
2808         int i;
2809         unsigned long l;
2810
2811         if (s->state == SSL3_ST_CW_CERT_A)
2812                 {
2813                 if ((s->cert == NULL) ||
2814                         (s->cert->key->x509 == NULL) ||
2815                         (s->cert->key->privatekey == NULL))
2816                         s->state=SSL3_ST_CW_CERT_B;
2817                 else
2818                         s->state=SSL3_ST_CW_CERT_C;
2819                 }
2820
2821         /* We need to get a client cert */
2822         if (s->state == SSL3_ST_CW_CERT_B)
2823                 {
2824                 /* If we get an error, we need to
2825                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2826                  * We then get retied later */
2827                 i=0;
2828                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2829                 if (i < 0)
2830                         {
2831                         s->rwstate=SSL_X509_LOOKUP;
2832                         return(-1);
2833                         }
2834                 s->rwstate=SSL_NOTHING;
2835                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2836                         {
2837                         s->state=SSL3_ST_CW_CERT_B;
2838                         if (    !SSL_use_certificate(s,x509) ||
2839                                 !SSL_use_PrivateKey(s,pkey))
2840                                 i=0;
2841                         }
2842                 else if (i == 1)
2843                         {
2844                         i=0;
2845                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2846                         }
2847
2848                 if (x509 != NULL) X509_free(x509);
2849                 if (pkey != NULL) EVP_PKEY_free(pkey);
2850                 if (i == 0)
2851                         {
2852                         if (s->version == SSL3_VERSION)
2853                                 {
2854                                 s->s3->tmp.cert_req=0;
2855                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2856                                 return(1);
2857                                 }
2858                         else
2859                                 {
2860                                 s->s3->tmp.cert_req=2;
2861                                 }
2862                         }
2863
2864                 /* Ok, we have a cert */
2865                 s->state=SSL3_ST_CW_CERT_C;
2866                 }
2867
2868         if (s->state == SSL3_ST_CW_CERT_C)
2869                 {
2870                 s->state=SSL3_ST_CW_CERT_D;
2871                 l=ssl3_output_cert_chain(s,
2872                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2873                 s->init_num=(int)l;
2874                 s->init_off=0;
2875                 }
2876         /* SSL3_ST_CW_CERT_D */
2877         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2878         }
2879
2880 #define has_bits(i,m)   (((i)&(m)) == (m))
2881
2882 int ssl3_check_cert_and_algorithm(SSL *s)
2883         {
2884         int i,idx;
2885         long alg_k,alg_a;
2886         EVP_PKEY *pkey=NULL;
2887         SESS_CERT *sc;
2888 #ifndef OPENSSL_NO_RSA
2889         RSA *rsa;
2890 #endif
2891 #ifndef OPENSSL_NO_DH
2892         DH *dh;
2893 #endif
2894
2895         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2896         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2897
2898         /* we don't have a certificate */
2899         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2900                 return(1);
2901
2902         sc=s->session->sess_cert;
2903         if (sc == NULL)
2904                 {
2905                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2906                 goto err;
2907                 }
2908
2909 #ifndef OPENSSL_NO_RSA
2910         rsa=s->session->sess_cert->peer_rsa_tmp;
2911 #endif
2912 #ifndef OPENSSL_NO_DH
2913         dh=s->session->sess_cert->peer_dh_tmp;
2914 #endif
2915
2916         /* This is the passed certificate */
2917
2918         idx=sc->peer_cert_type;
2919 #ifndef OPENSSL_NO_ECDH
2920         if (idx == SSL_PKEY_ECC)
2921                 {
2922                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2923                     s->s3->tmp.new_cipher) == 0)
2924                         { /* check failed */
2925                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2926                         goto f_err;
2927                         }
2928                 else
2929                         {
2930                         return 1;
2931                         }
2932                 }
2933 #endif
2934         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2935         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2936         EVP_PKEY_free(pkey);
2937
2938
2939         /* Check that we have a certificate if we require one */
2940         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2941                 {
2942                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2943                 goto f_err;
2944                 }
2945 #ifndef OPENSSL_NO_DSA
2946         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2947                 {
2948                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2949                 goto f_err;
2950                 }
2951 #endif
2952 #ifndef OPENSSL_NO_RSA
2953         if ((alg_k & SSL_kRSA) &&
2954                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2955                 {
2956                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2957                 goto f_err;
2958                 }
2959 #endif
2960 #ifndef OPENSSL_NO_DH
2961         if ((alg_k & SSL_kEDH) &&
2962                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2963                 {
2964                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2965                 goto f_err;
2966                 }
2967         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2968                 {
2969                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2970                 goto f_err;
2971                 }
2972 #ifndef OPENSSL_NO_DSA
2973         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2974                 {
2975                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2976                 goto f_err;
2977                 }
2978 #endif
2979 #endif
2980
2981         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2982                 {
2983 #ifndef OPENSSL_NO_RSA
2984                 if (alg_k & SSL_kRSA)
2985                         {
2986                         if (rsa == NULL
2987                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2988                                 {
2989                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2990                                 goto f_err;
2991                                 }
2992                         }
2993                 else
2994 #endif
2995 #ifndef OPENSSL_NO_DH
2996                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2997                             {
2998                             if (dh == NULL
2999                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3000                                 {
3001                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3002                                 goto f_err;
3003                                 }
3004                         }
3005                 else
3006 #endif
3007                         {
3008                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3009                         goto f_err;
3010                         }
3011                 }
3012         return(1);
3013 f_err:
3014         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3015 err:
3016         return(0);
3017         }
3018
3019 /* Check to see if handshake is full or resumed. Usually this is just a
3020  * case of checking to see if a cache hit has occurred. In the case of
3021  * session tickets we have to check the next message to be sure.
3022  */
3023
3024 #ifndef OPENSSL_NO_TLSEXT
3025 # ifndef OPENSSL_NO_NEXTPROTONEG
3026 int ssl3_send_next_proto(SSL *s)
3027         {
3028         unsigned int len, padding_len;
3029         unsigned char *d;
3030
3031         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3032                 {
3033                 len = s->next_proto_negotiated_len;
3034                 padding_len = 32 - ((len + 2) % 32);
3035                 d = (unsigned char *)s->init_buf->data;
3036                 d[4] = len;
3037                 memcpy(d + 5, s->next_proto_negotiated, len);
3038                 d[5 + len] = padding_len;
3039                 memset(d + 6 + len, 0, padding_len);
3040                 *(d++)=SSL3_MT_NEXT_PROTO;
3041                 l2n3(2 + len + padding_len, d);
3042                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3043                 s->init_num = 4 + 2 + len + padding_len;
3044                 s->init_off = 0;
3045                 }
3046
3047         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3048         }
3049 # endif
3050
3051 int ssl3_check_finished(SSL *s)
3052         {
3053         int ok;
3054         long n;
3055         /* If we have no ticket it cannot be a resumed session. */
3056         if (!s->session->tlsext_tick)
3057                 return 1;
3058         /* this function is called when we really expect a Certificate
3059          * message, so permit appropriate message length */
3060         n=s->method->ssl_get_message(s,
3061                 SSL3_ST_CR_CERT_A,
3062                 SSL3_ST_CR_CERT_B,
3063                 -1,
3064                 s->max_cert_list,
3065                 &ok);
3066         if (!ok) return((int)n);
3067         s->s3->tmp.reuse_message = 1;
3068         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3069                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3070                 return 2;
3071
3072         return 1;
3073         }
3074 #endif
3075
3076 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3077         {
3078         int i = 0;
3079 #ifndef OPENSSL_NO_ENGINE
3080         if (s->ctx->client_cert_engine)
3081                 {
3082                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3083                                                 SSL_get_client_CA_list(s),
3084                                                 px509, ppkey, NULL, NULL, NULL);
3085                 if (i != 0)
3086                         return i;
3087                 }
3088 #endif
3089         if (s->ctx->client_cert_cb)
3090                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3091         return i;
3092         }