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                 if (!(s->options &
 888                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 889                         {
 890                         al=SSL_AD_ILLEGAL_PARAMETER;
 891                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 892                         goto f_err;
 893                         }
 894                 }
 895         s->s3->tmp.new_cipher=c;
 896         if (!ssl3_digest_cached_records(s))
 897                 goto f_err;
 898
 899         /* lets get the compression algorithm */
 900         /* COMPRESSION */
 901 #ifdef OPENSSL_NO_COMP
 902         if (*(p++) != 0)
 903                 {
 904                 al=SSL_AD_ILLEGAL_PARAMETER;
 905                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 906                 goto f_err;
 907                 }
 908         /* If compression is disabled we'd better not try to resume a session
 909          * using compression.
 910          */
 911         if (s->session->compress_meth != 0)
 912                 {
 913                 al=SSL_AD_INTERNAL_ERROR;
 914                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 915                 goto f_err;
 916                 }
 917 #else
 918         j= *(p++);
 919         if (s->hit && j != s->session->compress_meth)
 920                 {
 921                 al=SSL_AD_ILLEGAL_PARAMETER;
 922                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 923                 goto f_err;
 924                 }
 925         if (j == 0)
 926                 comp=NULL;
 927         else if (s->options & SSL_OP_NO_COMPRESSION)
 928                 {
 929                 al=SSL_AD_ILLEGAL_PARAMETER;
 930                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 931                 goto f_err;
 932                 }
 933         else
 934                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 935
 936         if ((j != 0) && (comp == NULL))
 937                 {
 938                 al=SSL_AD_ILLEGAL_PARAMETER;
 939                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 940                 goto f_err;
 941                 }
 942         else
 943                 {
 944                 s->s3->tmp.new_compression=comp;
 945                 }
 946 #endif
 947
 948 #ifndef OPENSSL_NO_TLSEXT
 949         /* TLS extensions*/
 950         if (s->version >= SSL3_VERSION)
 951                 {
 952                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 953                         {
 954                         /* 'al' set by ssl_parse_serverhello_tlsext */
 955                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 956                         goto f_err;
 957                         }
 958                 if (ssl_check_serverhello_tlsext(s) <= 0)
 959                         {
 960                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 961                                 goto err;
 962                         }
 963                 }
 964 #endif
 965
 966         if (p != (d+n))
 967                 {
 968                 /* wrong packet length */
 969                 al=SSL_AD_DECODE_ERROR;
 970                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 971                 goto err;
 972                 }
 973
 974         return(1);
 975 f_err:
 976         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 977 err:
 978         return(-1);
 979         }
 980
 981 int ssl3_get_server_certificate(SSL *s)
 982         {
 983         int al,i,ok,ret= -1;
 984         unsigned long n,nc,llen,l;
 985         X509 *x=NULL;
 986         const unsigned char *q,*p;
 987         unsigned char *d;
 988         STACK_OF(X509) *sk=NULL;
 989         SESS_CERT *sc;
 990         EVP_PKEY *pkey=NULL;
 991         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 992
 993         n=s->method->ssl_get_message(s,
 994                 SSL3_ST_CR_CERT_A,
 995                 SSL3_ST_CR_CERT_B,
 996                 -1,
 997                 s->max_cert_list,
 998                 &ok);
 999
1000         if (!ok) return((int)n);
1001
1002         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1003                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1004                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1005                 {
1006                 s->s3->tmp.reuse_message=1;
1007                 return(1);
1008                 }
1009
1010         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1011                 {
1012                 al=SSL_AD_UNEXPECTED_MESSAGE;
1013                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1014                 goto f_err;
1015                 }
1016         p=d=(unsigned char *)s->init_msg;
1017
1018         if ((sk=sk_X509_new_null()) == NULL)
1019                 {
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1021                 goto err;
1022                 }
1023
1024         n2l3(p,llen);
1025         if (llen+3 != n)
1026                 {
1027                 al=SSL_AD_DECODE_ERROR;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1029                 goto f_err;
1030                 }
1031         for (nc=0; nc<llen; )
1032                 {
1033                 n2l3(p,l);
1034                 if ((l+nc+3) > llen)
1035                         {
1036                         al=SSL_AD_DECODE_ERROR;
1037                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1038                         goto f_err;
1039                         }
1040
1041                 q=p;
1042                 x=d2i_X509(NULL,&q,l);
1043                 if (x == NULL)
1044                         {
1045                         al=SSL_AD_BAD_CERTIFICATE;
1046                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1047                         goto f_err;
1048                         }
1049                 if (q != (p+l))
1050                         {
1051                         al=SSL_AD_DECODE_ERROR;
1052                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1053                         goto f_err;
1054                         }
1055                 if (!sk_X509_push(sk,x))
1056                         {
1057                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1058                         goto err;
1059                         }
1060                 x=NULL;
1061                 nc+=l+3;
1062                 p=q;
1063                 }
1064
1065         i=ssl_verify_cert_chain(s,sk);
1066         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1067 #ifndef OPENSSL_NO_KRB5
1068             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1069                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1070 #endif /* OPENSSL_NO_KRB5 */
1071                 )
1072                 {
1073                 al=ssl_verify_alarm_type(s->verify_result);
1074                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1075                 goto f_err;
1076                 }
1077         ERR_clear_error(); /* but we keep s->verify_result */
1078
1079         sc=ssl_sess_cert_new();
1080         if (sc == NULL) goto err;
1081
1082         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1083         s->session->sess_cert=sc;
1084
1085         sc->cert_chain=sk;
1086         /* Inconsistency alert: cert_chain does include the peer's
1087          * certificate, which we don't include in s3_srvr.c */
1088         x=sk_X509_value(sk,0);
1089         sk=NULL;
1090         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1091
1092         pkey=X509_get_pubkey(x);
1093
1094         /* VRS: allow null cert if auth == KRB5 */
1095         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1096                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1097                     ? 0 : 1;
1098
1099 #ifdef KSSL_DEBUG
1100         printf("pkey,x = %p, %p\n", pkey,x);
1101         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1102         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1103                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1104 #endif    /* KSSL_DEBUG */
1105
1106         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1107                 {
1108                 x=NULL;
1109                 al=SSL3_AL_FATAL;
1110                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1111                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1112                 goto f_err;
1113                 }
1114
1115         i=ssl_cert_type(x,pkey);
1116         if (need_cert && i < 0)
1117                 {
1118                 x=NULL;
1119                 al=SSL3_AL_FATAL;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1121                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1122                 goto f_err;
1123                 }
1124
1125         if (need_cert)
1126                 {
1127                 sc->peer_cert_type=i;
1128                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1129                 /* Why would the following ever happen?
1130                  * We just created sc a couple of lines ago. */
1131                 if (sc->peer_pkeys[i].x509 != NULL)
1132                         X509_free(sc->peer_pkeys[i].x509);
1133                 sc->peer_pkeys[i].x509=x;
1134                 sc->peer_key= &(sc->peer_pkeys[i]);
1135
1136                 if (s->session->peer != NULL)
1137                         X509_free(s->session->peer);
1138                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1139                 s->session->peer=x;
1140                 }
1141         else
1142                 {
1143                 sc->peer_cert_type=i;
1144                 sc->peer_key= NULL;
1145
1146                 if (s->session->peer != NULL)
1147                         X509_free(s->session->peer);
1148                 s->session->peer=NULL;
1149                 }
1150         s->session->verify_result = s->verify_result;
1151
1152         x=NULL;
1153         ret=1;
1154
1155         if (0)
1156                 {
1157 f_err:
1158                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1159                 }
1160 err:
1161         EVP_PKEY_free(pkey);
1162         X509_free(x);
1163         sk_X509_pop_free(sk,X509_free);
1164         return(ret);
1165         }
1166
1167 int ssl3_get_key_exchange(SSL *s)
1168         {
1169 #ifndef OPENSSL_NO_RSA
1170         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1171 #endif
1172         EVP_MD_CTX md_ctx;
1173         unsigned char *param,*p;
1174         int al,i,j,param_len,ok;
1175         long n,alg_k,alg_a;
1176         EVP_PKEY *pkey=NULL;
1177 #ifndef OPENSSL_NO_RSA
1178         RSA *rsa=NULL;
1179 #endif
1180 #ifndef OPENSSL_NO_DH
1181         DH *dh=NULL;
1182 #endif
1183 #ifndef OPENSSL_NO_ECDH
1184         EC_KEY *ecdh = NULL;
1185         BN_CTX *bn_ctx = NULL;
1186         EC_POINT *srvr_ecpoint = NULL;
1187         int curve_nid = 0;
1188         int encoded_pt_len = 0;
1189 #endif
1190
1191         /* use same message size as in ssl3_get_certificate_request()
1192          * as ServerKeyExchange message may be skipped */
1193         n=s->method->ssl_get_message(s,
1194                 SSL3_ST_CR_KEY_EXCH_A,
1195                 SSL3_ST_CR_KEY_EXCH_B,
1196                 -1,
1197                 s->max_cert_list,
1198                 &ok);
1199         if (!ok) return((int)n);
1200
1201         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1202                 {
1203 #ifndef OPENSSL_NO_PSK
1204                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1205                    omitted if no identity hint is sent. Set
1206                    session->sess_cert anyway to avoid problems
1207                    later.*/
1208                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1209                         {
1210                         s->session->sess_cert=ssl_sess_cert_new();
1211                         if (s->ctx->psk_identity_hint)
1212                                 OPENSSL_free(s->ctx->psk_identity_hint);
1213                         s->ctx->psk_identity_hint = NULL;
1214                         }
1215 #endif
1216                 s->s3->tmp.reuse_message=1;
1217                 return(1);
1218                 }
1219
1220         param=p=(unsigned char *)s->init_msg;
1221         if (s->session->sess_cert != NULL)
1222                 {
1223 #ifndef OPENSSL_NO_RSA
1224                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1225                         {
1226                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1227                         s->session->sess_cert->peer_rsa_tmp=NULL;
1228                         }
1229 #endif
1230 #ifndef OPENSSL_NO_DH
1231                 if (s->session->sess_cert->peer_dh_tmp)
1232                         {
1233                         DH_free(s->session->sess_cert->peer_dh_tmp);
1234                         s->session->sess_cert->peer_dh_tmp=NULL;
1235                         }
1236 #endif
1237 #ifndef OPENSSL_NO_ECDH
1238                 if (s->session->sess_cert->peer_ecdh_tmp)
1239                         {
1240                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1241                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1242                         }
1243 #endif
1244                 }
1245         else
1246                 {
1247                 s->session->sess_cert=ssl_sess_cert_new();
1248                 }
1249
1250         param_len=0;
1251         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1252         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1253         EVP_MD_CTX_init(&md_ctx);
1254
1255 #ifndef OPENSSL_NO_PSK
1256         if (alg_k & SSL_kPSK)
1257                 {
1258                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1259
1260                 al=SSL_AD_HANDSHAKE_FAILURE;
1261                 n2s(p,i);
1262                 param_len=i+2;
1263                 /* Store PSK identity hint for later use, hint is used
1264                  * in ssl3_send_client_key_exchange.  Assume that the
1265                  * maximum length of a PSK identity hint can be as
1266                  * long as the maximum length of a PSK identity. */
1267                 if (i > PSK_MAX_IDENTITY_LEN)
1268                         {
1269                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1270                                 SSL_R_DATA_LENGTH_TOO_LONG);
1271                         goto f_err;
1272                         }
1273                 if (param_len > n)
1274                         {
1275                         al=SSL_AD_DECODE_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1277                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1278                         goto f_err;
1279                         }
1280                 /* If received PSK identity hint contains NULL
1281                  * characters, the hint is truncated from the first
1282                  * NULL. p may not be ending with NULL, so create a
1283                  * NULL-terminated string. */
1284                 memcpy(tmp_id_hint, p, i);
1285                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1286                 if (s->ctx->psk_identity_hint != NULL)
1287                         OPENSSL_free(s->ctx->psk_identity_hint);
1288                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1289                 if (s->ctx->psk_identity_hint == NULL)
1290                         {
1291                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1292                         goto f_err;
1293                         }
1294
1295                 p+=i;
1296                 n-=param_len;
1297                 }
1298         else
1299 #endif /* !OPENSSL_NO_PSK */
1300 #ifndef OPENSSL_NO_RSA
1301         if (alg_k & SSL_kRSA)
1302                 {
1303                 if ((rsa=RSA_new()) == NULL)
1304                         {
1305                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1306                         goto err;
1307                         }
1308                 n2s(p,i);
1309                 param_len=i+2;
1310                 if (param_len > n)
1311                         {
1312                         al=SSL_AD_DECODE_ERROR;
1313                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1314                         goto f_err;
1315                         }
1316                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1317                         {
1318                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1319                         goto err;
1320                         }
1321                 p+=i;
1322
1323                 n2s(p,i);
1324                 param_len+=i+2;
1325                 if (param_len > n)
1326                         {
1327                         al=SSL_AD_DECODE_ERROR;
1328                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1329                         goto f_err;
1330                         }
1331                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1332                         {
1333                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1334                         goto err;
1335                         }
1336                 p+=i;
1337                 n-=param_len;
1338
1339                 /* this should be because we are using an export cipher */
1340                 if (alg_a & SSL_aRSA)
1341                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1342                 else
1343                         {
1344                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1345                         goto err;
1346                         }
1347                 s->session->sess_cert->peer_rsa_tmp=rsa;
1348                 rsa=NULL;
1349                 }
1350 #else /* OPENSSL_NO_RSA */
1351         if (0)
1352                 ;
1353 #endif
1354 #ifndef OPENSSL_NO_DH
1355         else if (alg_k & SSL_kEDH)
1356                 {
1357                 if ((dh=DH_new()) == NULL)
1358                         {
1359                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1360                         goto err;
1361                         }
1362                 n2s(p,i);
1363                 param_len=i+2;
1364                 if (param_len > n)
1365                         {
1366                         al=SSL_AD_DECODE_ERROR;
1367                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1368                         goto f_err;
1369                         }
1370                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1373                         goto err;
1374                         }
1375                 p+=i;
1376
1377                 n2s(p,i);
1378                 param_len+=i+2;
1379                 if (param_len > n)
1380                         {
1381                         al=SSL_AD_DECODE_ERROR;
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1383                         goto f_err;
1384                         }
1385                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1386                         {
1387                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1388                         goto err;
1389                         }
1390                 p+=i;
1391
1392                 n2s(p,i);
1393                 param_len+=i+2;
1394                 if (param_len > n)
1395                         {
1396                         al=SSL_AD_DECODE_ERROR;
1397                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1398                         goto f_err;
1399                         }
1400                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1401                         {
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1403                         goto err;
1404                         }
1405                 p+=i;
1406                 n-=param_len;
1407
1408 #ifndef OPENSSL_NO_RSA
1409                 if (alg_a & SSL_aRSA)
1410                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1411 #else
1412                 if (0)
1413                         ;
1414 #endif
1415 #ifndef OPENSSL_NO_DSA
1416                 else if (alg_a & SSL_aDSS)
1417                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1418 #endif
1419                 /* else anonymous DH, so no certificate or pkey. */
1420
1421                 s->session->sess_cert->peer_dh_tmp=dh;
1422                 dh=NULL;
1423                 }
1424         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1425                 {
1426                 al=SSL_AD_ILLEGAL_PARAMETER;
1427                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1428                 goto f_err;
1429                 }
1430 #endif /* !OPENSSL_NO_DH */
1431
1432 #ifndef OPENSSL_NO_ECDH
1433         else if (alg_k & SSL_kEECDH)
1434                 {
1435                 EC_GROUP *ngroup;
1436                 const EC_GROUP *group;
1437
1438                 if ((ecdh=EC_KEY_new()) == NULL)
1439                         {
1440                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1441                         goto err;
1442                         }
1443
1444                 /* Extract elliptic curve parameters and the
1445                  * server's ephemeral ECDH public key.
1446                  * Keep accumulating lengths of various components in
1447                  * param_len and make sure it never exceeds n.
1448                  */
1449
1450                 /* XXX: For now we only support named (not generic) curves
1451                  * and the ECParameters in this case is just three bytes.
1452                  */
1453                 param_len=3;
1454                 if ((param_len > n) ||
1455                     (*p != NAMED_CURVE_TYPE) ||
1456                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1457                         {
1458                         al=SSL_AD_INTERNAL_ERROR;
1459                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1460                         goto f_err;
1461                         }
1462
1463                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1464                 if (ngroup == NULL)
1465                         {
1466                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1467                         goto err;
1468                         }
1469                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1472                         goto err;
1473                         }
1474                 EC_GROUP_free(ngroup);
1475
1476                 group = EC_KEY_get0_group(ecdh);
1477
1478                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1479                     (EC_GROUP_get_degree(group) > 163))
1480                         {
1481                         al=SSL_AD_EXPORT_RESTRICTION;
1482                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1483                         goto f_err;
1484                         }
1485
1486                 p+=3;
1487
1488                 /* Next, get the encoded ECPoint */
1489                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1490                     ((bn_ctx = BN_CTX_new()) == NULL))
1491                         {
1492                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1493                         goto err;
1494                         }
1495
1496                 encoded_pt_len = *p;  /* length of encoded point */
1497                 p+=1;
1498                 param_len += (1 + encoded_pt_len);
1499                 if ((param_len > n) ||
1500                     (EC_POINT_oct2point(group, srvr_ecpoint,
1501                         p, encoded_pt_len, bn_ctx) == 0))
1502                         {
1503                         al=SSL_AD_DECODE_ERROR;
1504                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1505                         goto f_err;
1506                         }
1507
1508                 n-=param_len;
1509                 p+=encoded_pt_len;
1510
1511                 /* The ECC/TLS specification does not mention
1512                  * the use of DSA to sign ECParameters in the server
1513                  * key exchange message. We do support RSA and ECDSA.
1514                  */
1515                 if (0) ;
1516 #ifndef OPENSSL_NO_RSA
1517                 else if (alg_a & SSL_aRSA)
1518                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1519 #endif
1520 #ifndef OPENSSL_NO_ECDSA
1521                 else if (alg_a & SSL_aECDSA)
1522                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1523 #endif
1524                 /* else anonymous ECDH, so no certificate or pkey. */
1525                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1526                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1527                 ecdh=NULL;
1528                 BN_CTX_free(bn_ctx);
1529                 bn_ctx = NULL;
1530                 EC_POINT_free(srvr_ecpoint);
1531                 srvr_ecpoint = NULL;
1532                 }
1533         else if (alg_k)
1534                 {
1535                 al=SSL_AD_UNEXPECTED_MESSAGE;
1536                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1537                 goto f_err;
1538                 }
1539 #endif /* !OPENSSL_NO_ECDH */
1540
1541
1542         /* p points to the next byte, there are 'n' bytes left */
1543
1544         /* if it was signed, check the signature */
1545         if (pkey != NULL)
1546                 {
1547                 n2s(p,i);
1548                 n-=2;
1549                 j=EVP_PKEY_size(pkey);
1550
1551                 if ((i != n) || (n > j) || (n <= 0))
1552                         {
1553                         /* wrong packet length */
1554                         al=SSL_AD_DECODE_ERROR;
1555                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1556                         goto f_err;
1557                         }
1558
1559 #ifndef OPENSSL_NO_RSA
1560                 if (pkey->type == EVP_PKEY_RSA)
1561                         {
1562                         int num;
1563
1564                         j=0;
1565                         q=md_buf;
1566                         for (num=2; num > 0; num--)
1567                                 {
1568                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1569                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1570                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1571                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1572                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1573                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1574                                 q+=i;
1575                                 j+=i;
1576                                 }
1577                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1578                                                                 pkey->pkey.rsa);
1579                         if (i < 0)
1580                                 {
1581                                 al=SSL_AD_DECRYPT_ERROR;
1582                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1583                                 goto f_err;
1584                                 }
1585                         if (i == 0)
1586                                 {
1587                                 /* bad signature */
1588                                 al=SSL_AD_DECRYPT_ERROR;
1589                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1590                                 goto f_err;
1591                                 }
1592                         }
1593                 else
1594 #endif
1595 #ifndef OPENSSL_NO_DSA
1596                         if (pkey->type == EVP_PKEY_DSA)
1597                         {
1598                         /* lets do DSS */
1599                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1600                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1601                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1602                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1603                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1604                                 {
1605                                 /* bad signature */
1606                                 al=SSL_AD_DECRYPT_ERROR;
1607                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1608                                 goto f_err;
1609                                 }
1610                         }
1611                 else
1612 #endif
1613 #ifndef OPENSSL_NO_ECDSA
1614                         if (pkey->type == EVP_PKEY_EC)
1615                         {
1616                         /* let's do ECDSA */
1617                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1618                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1619                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1620                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1621                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1622                                 {
1623                                 /* bad signature */
1624                                 al=SSL_AD_DECRYPT_ERROR;
1625                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1626                                 goto f_err;
1627                                 }
1628                         }
1629                 else
1630 #endif
1631                         {
1632                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1633                         goto err;
1634                         }
1635                 }
1636         else
1637                 {
1638                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1639                         /* aNULL or kPSK do not need public keys */
1640                         {
1641                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1642                         goto err;
1643                         }
1644                 /* still data left over */
1645                 if (n != 0)
1646                         {
1647                         al=SSL_AD_DECODE_ERROR;
1648                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1649                         goto f_err;
1650                         }
1651                 }
1652         EVP_PKEY_free(pkey);
1653         EVP_MD_CTX_cleanup(&md_ctx);
1654         return(1);
1655 f_err:
1656         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1657 err:
1658         EVP_PKEY_free(pkey);
1659 #ifndef OPENSSL_NO_RSA
1660         if (rsa != NULL)
1661                 RSA_free(rsa);
1662 #endif
1663 #ifndef OPENSSL_NO_DH
1664         if (dh != NULL)
1665                 DH_free(dh);
1666 #endif
1667 #ifndef OPENSSL_NO_ECDH
1668         BN_CTX_free(bn_ctx);
1669         EC_POINT_free(srvr_ecpoint);
1670         if (ecdh != NULL)
1671                 EC_KEY_free(ecdh);
1672 #endif
1673         EVP_MD_CTX_cleanup(&md_ctx);
1674         return(-1);
1675         }
1676
1677 int ssl3_get_certificate_request(SSL *s)
1678         {
1679         int ok,ret=0;
1680         unsigned long n,nc,l;
1681         unsigned int llen,ctype_num,i;
1682         X509_NAME *xn=NULL;
1683         const unsigned char *p,*q;
1684         unsigned char *d;
1685         STACK_OF(X509_NAME) *ca_sk=NULL;
1686
1687         n=s->method->ssl_get_message(s,
1688                 SSL3_ST_CR_CERT_REQ_A,
1689                 SSL3_ST_CR_CERT_REQ_B,
1690                 -1,
1691                 s->max_cert_list,
1692                 &ok);
1693
1694         if (!ok) return((int)n);
1695
1696         s->s3->tmp.cert_req=0;
1697
1698         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1699                 {
1700                 s->s3->tmp.reuse_message=1;
1701                 return(1);
1702                 }
1703
1704         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1705                 {
1706                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1707                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1708                 goto err;
1709                 }
1710
1711         /* TLS does not like anon-DH with client cert */
1712         if (s->version > SSL3_VERSION)
1713                 {
1714                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1715                         {
1716                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1717                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1718                         goto err;
1719                         }
1720                 }
1721
1722         p=d=(unsigned char *)s->init_msg;
1723
1724         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1725                 {
1726                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1727                 goto err;
1728                 }
1729
1730         /* get the certificate types */
1731         ctype_num= *(p++);
1732         if (ctype_num > SSL3_CT_NUMBER)
1733                 ctype_num=SSL3_CT_NUMBER;
1734         for (i=0; i<ctype_num; i++)
1735                 s->s3->tmp.ctype[i]= p[i];
1736         p+=ctype_num;
1737
1738         /* get the CA RDNs */
1739         n2s(p,llen);
1740 #if 0
1741 {
1742 FILE *out;
1743 out=fopen("/tmp/vsign.der","w");
1744 fwrite(p,1,llen,out);
1745 fclose(out);
1746 }
1747 #endif
1748
1749         if ((llen+ctype_num+2+1) != n)
1750                 {
1751                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1752                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1753                 goto err;
1754                 }
1755
1756         for (nc=0; nc<llen; )
1757                 {
1758                 n2s(p,l);
1759                 if ((l+nc+2) > llen)
1760                         {
1761                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1762                                 goto cont; /* netscape bugs */
1763                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1764                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1765                         goto err;
1766                         }
1767
1768                 q=p;
1769
1770                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1771                         {
1772                         /* If netscape tolerance is on, ignore errors */
1773                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1774                                 goto cont;
1775                         else
1776                                 {
1777                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1778                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1779                                 goto err;
1780                                 }
1781                         }
1782
1783                 if (q != (p+l))
1784                         {
1785                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1786                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1787                         goto err;
1788                         }
1789                 if (!sk_X509_NAME_push(ca_sk,xn))
1790                         {
1791                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1792                         goto err;
1793                         }
1794
1795                 p+=l;
1796                 nc+=l+2;
1797                 }
1798
1799         if (0)
1800                 {
1801 cont:
1802                 ERR_clear_error();
1803                 }
1804
1805         /* we should setup a certificate to return.... */
1806         s->s3->tmp.cert_req=1;
1807         s->s3->tmp.ctype_num=ctype_num;
1808         if (s->s3->tmp.ca_names != NULL)
1809                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1810         s->s3->tmp.ca_names=ca_sk;
1811         ca_sk=NULL;
1812
1813         ret=1;
1814 err:
1815         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1816         return(ret);
1817         }
1818
1819 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1820         {
1821         return(X509_NAME_cmp(*a,*b));
1822         }
1823 #ifndef OPENSSL_NO_TLSEXT
1824 int ssl3_get_new_session_ticket(SSL *s)
1825         {
1826         int ok,al,ret=0, ticklen;
1827         long n;
1828         const unsigned char *p;
1829         unsigned char *d;
1830
1831         n=s->method->ssl_get_message(s,
1832                 SSL3_ST_CR_SESSION_TICKET_A,
1833                 SSL3_ST_CR_SESSION_TICKET_B,
1834                 -1,
1835                 16384,
1836                 &ok);
1837
1838         if (!ok)
1839                 return((int)n);
1840
1841         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1842                 {
1843                 s->s3->tmp.reuse_message=1;
1844                 return(1);
1845                 }
1846         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1847                 {
1848                 al=SSL_AD_UNEXPECTED_MESSAGE;
1849                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1850                 goto f_err;
1851                 }
1852         if (n < 6)
1853                 {
1854                 /* need at least ticket_lifetime_hint + ticket length */
1855                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1856                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1857                 goto f_err;
1858                 }
1859
1860         p=d=(unsigned char *)s->init_msg;
1861         n2l(p, s->session->tlsext_tick_lifetime_hint);
1862         n2s(p, ticklen);
1863         /* ticket_lifetime_hint + ticket_length + ticket */
1864         if (ticklen + 6 != n)
1865                 {
1866                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1867                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1868                 goto f_err;
1869                 }
1870         if (s->session->tlsext_tick)
1871                 {
1872                 OPENSSL_free(s->session->tlsext_tick);
1873                 s->session->tlsext_ticklen = 0;
1874                 }
1875         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1876         if (!s->session->tlsext_tick)
1877                 {
1878                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1879                 goto err;
1880                 }
1881         memcpy(s->session->tlsext_tick, p, ticklen);
1882         s->session->tlsext_ticklen = ticklen;
1883         /* There are two ways to detect a resumed ticket sesion.
1884          * One is to set an appropriate session ID and then the server
1885          * must return a match in ServerHello. This allows the normal
1886          * client session ID matching to work and we know much
1887          * earlier that the ticket has been accepted.
1888          *
1889          * The other way is to set zero length session ID when the
1890          * ticket is presented and rely on the handshake to determine
1891          * session resumption.
1892          *
1893          * We choose the former approach because this fits in with
1894          * assumptions elsewhere in OpenSSL. The session ID is set
1895          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1896          * ticket.
1897          */
1898         EVP_Digest(p, ticklen,
1899                         s->session->session_id, &s->session->session_id_length,
1900 #ifndef OPENSSL_NO_SHA256
1901                                                         EVP_sha256(), NULL);
1902 #else
1903                                                         EVP_sha1(), NULL);
1904 #endif
1905         ret=1;
1906         return(ret);
1907 f_err:
1908         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1909 err:
1910         return(-1);
1911         }
1912
1913 int ssl3_get_cert_status(SSL *s)
1914         {
1915         int ok, al;
1916         unsigned long resplen,n;
1917         const unsigned char *p;
1918
1919         n=s->method->ssl_get_message(s,
1920                 SSL3_ST_CR_CERT_STATUS_A,
1921                 SSL3_ST_CR_CERT_STATUS_B,
1922                 SSL3_MT_CERTIFICATE_STATUS,
1923                 16384,
1924                 &ok);
1925
1926         if (!ok) return((int)n);
1927         if (n < 4)
1928                 {
1929                 /* need at least status type + length */
1930                 al = SSL_AD_DECODE_ERROR;
1931                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1932                 goto f_err;
1933                 }
1934         p = (unsigned char *)s->init_msg;
1935         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1936                 {
1937                 al = SSL_AD_DECODE_ERROR;
1938                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1939                 goto f_err;
1940                 }
1941         n2l3(p, resplen);
1942         if (resplen + 4 != n)
1943                 {
1944                 al = SSL_AD_DECODE_ERROR;
1945                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1946                 goto f_err;
1947                 }
1948         if (s->tlsext_ocsp_resp)
1949                 OPENSSL_free(s->tlsext_ocsp_resp);
1950         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1951         if (!s->tlsext_ocsp_resp)
1952                 {
1953                 al = SSL_AD_INTERNAL_ERROR;
1954                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1955                 goto f_err;
1956                 }
1957         s->tlsext_ocsp_resplen = resplen;
1958         if (s->ctx->tlsext_status_cb)
1959                 {
1960                 int ret;
1961                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1962                 if (ret == 0)
1963                         {
1964                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1965                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1966                         goto f_err;
1967                         }
1968                 if (ret < 0)
1969                         {
1970                         al = SSL_AD_INTERNAL_ERROR;
1971                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1972                         goto f_err;
1973                         }
1974                 }
1975         return 1;
1976 f_err:
1977         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1978         return(-1);
1979         }
1980 #endif
1981
1982 int ssl3_get_server_done(SSL *s)
1983         {
1984         int ok,ret=0;
1985         long n;
1986
1987         n=s->method->ssl_get_message(s,
1988                 SSL3_ST_CR_SRVR_DONE_A,
1989                 SSL3_ST_CR_SRVR_DONE_B,
1990                 SSL3_MT_SERVER_DONE,
1991                 30, /* should be very small, like 0 :-) */
1992                 &ok);
1993
1994         if (!ok) return((int)n);
1995         if (n > 0)
1996                 {
1997                 /* should contain no data */
1998                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1999                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2000                 return -1;
2001                 }
2002         ret=1;
2003         return(ret);
2004         }
2005
2006
2007 int ssl3_send_client_key_exchange(SSL *s)
2008         {
2009         unsigned char *p,*d;
2010         int n;
2011         unsigned long alg_k;
2012 #ifndef OPENSSL_NO_RSA
2013         unsigned char *q;
2014         EVP_PKEY *pkey=NULL;
2015 #endif
2016 #ifndef OPENSSL_NO_KRB5
2017         KSSL_ERR kssl_err;
2018 #endif /* OPENSSL_NO_KRB5 */
2019 #ifndef OPENSSL_NO_ECDH
2020         EC_KEY *clnt_ecdh = NULL;
2021         const EC_POINT *srvr_ecpoint = NULL;
2022         EVP_PKEY *srvr_pub_pkey = NULL;
2023         unsigned char *encodedPoint = NULL;
2024         int encoded_pt_len = 0;
2025         BN_CTX * bn_ctx = NULL;
2026 #endif
2027
2028         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2029                 {
2030                 d=(unsigned char *)s->init_buf->data;
2031                 p= &(d[4]);
2032
2033                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2034
2035                 /* Fool emacs indentation */
2036                 if (0) {}
2037 #ifndef OPENSSL_NO_RSA
2038                 else if (alg_k & SSL_kRSA)
2039                         {
2040                         RSA *rsa;
2041                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2042
2043                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2044                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2045                         else
2046                                 {
2047                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2048                                 if ((pkey == NULL) ||
2049                                         (pkey->type != EVP_PKEY_RSA) ||
2050                                         (pkey->pkey.rsa == NULL))
2051                                         {
2052                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2053                                         goto err;
2054                                         }
2055                                 rsa=pkey->pkey.rsa;
2056                                 EVP_PKEY_free(pkey);
2057                                 }
2058
2059                         tmp_buf[0]=s->client_version>>8;
2060                         tmp_buf[1]=s->client_version&0xff;
2061                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2062                                         goto err;
2063
2064                         s->session->master_key_length=sizeof tmp_buf;
2065
2066                         q=p;
2067                         /* Fix buf for TLS and beyond */
2068                         if (s->version > SSL3_VERSION)
2069                                 p+=2;
2070                         n=RSA_public_encrypt(sizeof tmp_buf,
2071                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2072 #ifdef PKCS1_CHECK
2073                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2074                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2075 #endif
2076                         if (n <= 0)
2077                                 {
2078                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2079                                 goto err;
2080                                 }
2081
2082                         /* Fix buf for TLS and beyond */
2083                         if (s->version > SSL3_VERSION)
2084                                 {
2085                                 s2n(n,q);
2086                                 n+=2;
2087                                 }
2088
2089                         s->session->master_key_length=
2090                                 s->method->ssl3_enc->generate_master_secret(s,
2091                                         s->session->master_key,
2092                                         tmp_buf,sizeof tmp_buf);
2093                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2094                         }
2095 #endif
2096 #ifndef OPENSSL_NO_KRB5
2097                 else if (alg_k & SSL_kKRB5)
2098                         {
2099                         krb5_error_code krb5rc;
2100                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2101                         /*  krb5_data   krb5_ap_req;  */
2102                         krb5_data       *enc_ticket;
2103                         krb5_data       authenticator, *authp = NULL;
2104                         EVP_CIPHER_CTX  ciph_ctx;
2105                         const EVP_CIPHER *enc = NULL;
2106                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2107                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2108                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2109                                                 + EVP_MAX_IV_LENGTH];
2110                         int             padl, outl = sizeof(epms);
2111
2112                         EVP_CIPHER_CTX_init(&ciph_ctx);
2113
2114 #ifdef KSSL_DEBUG
2115                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2116                                 alg_k, SSL_kKRB5);
2117 #endif  /* KSSL_DEBUG */
2118
2119                         authp = NULL;
2120 #ifdef KRB5SENDAUTH
2121                         if (KRB5SENDAUTH)  authp = &authenticator;
2122 #endif  /* KRB5SENDAUTH */
2123
2124                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2125                                 &kssl_err);
2126                         enc = kssl_map_enc(kssl_ctx->enctype);
2127                         if (enc == NULL)
2128                             goto err;
2129 #ifdef KSSL_DEBUG
2130                         {
2131                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2132                         if (krb5rc && kssl_err.text)
2133                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2134                         }
2135 #endif  /* KSSL_DEBUG */
2136
2137                         if (krb5rc)
2138                                 {
2139                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2140                                                 SSL_AD_HANDSHAKE_FAILURE);
2141                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2142                                                 kssl_err.reason);
2143                                 goto err;
2144                                 }
2145
2146                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2147                         **  in place of RFC 2712 KerberosWrapper, as in:
2148                         **
2149                         **  Send ticket (copy to *p, set n = length)
2150                         **  n = krb5_ap_req.length;
2151                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2152                         **  if (krb5_ap_req.data)
2153                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2154                         **
2155                         **  Now using real RFC 2712 KerberosWrapper
2156                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2157                         **  Note: 2712 "opaque" types are here replaced
2158                         **  with a 2-byte length followed by the value.
2159                         **  Example:
2160                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2161                         **  Where "xx xx" = length bytes.  Shown here with
2162                         **  optional authenticator omitted.
2163                         */
2164
2165                         /*  KerberosWrapper.Ticket              */
2166                         s2n(enc_ticket->length,p);
2167                         memcpy(p, enc_ticket->data, enc_ticket->length);
2168                         p+= enc_ticket->length;
2169                         n = enc_ticket->length + 2;
2170
2171                         /*  KerberosWrapper.Authenticator       */
2172                         if (authp  &&  authp->length)
2173                                 {
2174                                 s2n(authp->length,p);
2175                                 memcpy(p, authp->data, authp->length);
2176                                 p+= authp->length;
2177                                 n+= authp->length + 2;
2178
2179                                 free(authp->data);
2180                                 authp->data = NULL;
2181                                 authp->length = 0;
2182                                 }
2183                         else
2184                                 {
2185                                 s2n(0,p);/*  null authenticator length  */
2186                                 n+=2;
2187                                 }
2188
2189                             tmp_buf[0]=s->client_version>>8;
2190                             tmp_buf[1]=s->client_version&0xff;
2191                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2192                                 goto err;
2193
2194                         /*  20010420 VRS.  Tried it this way; failed.
2195                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2196                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2197                         **                              kssl_ctx->length);
2198                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2199                         */
2200
2201                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2202                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2203                                 kssl_ctx->key,iv);
2204                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2205                                 sizeof tmp_buf);
2206                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2207                         outl += padl;
2208                         if (outl > (int)sizeof epms)
2209                                 {
2210                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2211                                 goto err;
2212                                 }
2213                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2214
2215                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2216                         s2n(outl,p);
2217                         memcpy(p, epms, outl);
2218                         p+=outl;
2219                         n+=outl + 2;
2220
2221                         s->session->master_key_length=
2222                                 s->method->ssl3_enc->generate_master_secret(s,
2223                                         s->session->master_key,
2224                                         tmp_buf, sizeof tmp_buf);
2225
2226                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2227                         OPENSSL_cleanse(epms, outl);
2228                         }
2229 #endif
2230 #ifndef OPENSSL_NO_DH
2231                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2232                         {
2233                         DH *dh_srvr,*dh_clnt;
2234
2235                         if (s->session->sess_cert == NULL)
2236                                 {
2237                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2238                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2239                                 goto err;
2240                                 }
2241
2242                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2243                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2244                         else
2245                                 {
2246                                 /* we get them from the cert */
2247                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2248                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2249                                 goto err;
2250                                 }
2251
2252                         /* generate a new random key */
2253                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2254                                 {
2255                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2256                                 goto err;
2257                                 }
2258                         if (!DH_generate_key(dh_clnt))
2259                                 {
2260                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2261                                 goto err;
2262                                 }
2263
2264                         /* use the 'p' output buffer for the DH key, but
2265                          * make sure to clear it out afterwards */
2266
2267                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2268
2269                         if (n <= 0)
2270                                 {
2271                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2272                                 goto err;
2273                                 }
2274
2275                         /* generate master key from the result */
2276                         s->session->master_key_length=
2277                                 s->method->ssl3_enc->generate_master_secret(s,
2278                                         s->session->master_key,p,n);
2279                         /* clean up */
2280                         memset(p,0,n);
2281
2282                         /* send off the data */
2283                         n=BN_num_bytes(dh_clnt->pub_key);
2284                         s2n(n,p);
2285                         BN_bn2bin(dh_clnt->pub_key,p);
2286                         n+=2;
2287
2288                         DH_free(dh_clnt);
2289
2290                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2291                         }
2292 #endif
2293
2294 #ifndef OPENSSL_NO_ECDH
2295                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2296                         {
2297                         const EC_GROUP *srvr_group = NULL;
2298                         EC_KEY *tkey;
2299                         int ecdh_clnt_cert = 0;
2300                         int field_size = 0;
2301
2302                         /* Did we send out the client's
2303                          * ECDH share for use in premaster
2304                          * computation as part of client certificate?
2305                          * If so, set ecdh_clnt_cert to 1.
2306                          */
2307                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2308                                 {
2309                                 /* XXX: For now, we do not support client
2310                                  * authentication using ECDH certificates.
2311                                  * To add such support, one needs to add
2312                                  * code that checks for appropriate
2313                                  * conditions and sets ecdh_clnt_cert to 1.
2314                                  * For example, the cert have an ECC
2315                                  * key on the same curve as the server's
2316                                  * and the key should be authorized for
2317                                  * key agreement.
2318                                  *
2319                                  * One also needs to add code in ssl3_connect
2320                                  * to skip sending the certificate verify
2321                                  * message.
2322                                  *
2323                                  * if ((s->cert->key->privatekey != NULL) &&
2324                                  *     (s->cert->key->privatekey->type ==
2325                                  *      EVP_PKEY_EC) && ...)
2326                                  * ecdh_clnt_cert = 1;
2327                                  */
2328                                 }
2329
2330                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2331                                 {
2332                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2333                                 }
2334                         else
2335                                 {
2336                                 /* Get the Server Public Key from Cert */
2337                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2338                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2339                                 if ((srvr_pub_pkey == NULL) ||
2340                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2341                                     (srvr_pub_pkey->pkey.ec == NULL))
2342                                         {
2343                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2344                                             ERR_R_INTERNAL_ERROR);
2345                                         goto err;
2346                                         }
2347
2348                                 tkey = srvr_pub_pkey->pkey.ec;
2349                                 }
2350
2351                         srvr_group   = EC_KEY_get0_group(tkey);
2352                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2353
2354                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2355                                 {
2356                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2357                                     ERR_R_INTERNAL_ERROR);
2358                                 goto err;
2359                                 }
2360
2361                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2362                                 {
2363                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2364                                 goto err;
2365                                 }
2366
2367                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2368                                 {
2369                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2370                                 goto err;
2371                                 }
2372                         if (ecdh_clnt_cert)
2373                                 {
2374                                 /* Reuse key info from our certificate
2375                                  * We only need our private key to perform
2376                                  * the ECDH computation.
2377                                  */
2378                                 const BIGNUM *priv_key;
2379                                 tkey = s->cert->key->privatekey->pkey.ec;
2380                                 priv_key = EC_KEY_get0_private_key(tkey);
2381                                 if (priv_key == NULL)
2382                                         {
2383                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2384                                         goto err;
2385                                         }
2386                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2387                                         {
2388                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2389                                         goto err;
2390                                         }
2391                                 }
2392                         else
2393                                 {
2394                                 /* Generate a new ECDH key pair */
2395                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2396                                         {
2397                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2398                                         goto err;
2399                                         }
2400                                 }
2401
2402                         /* use the 'p' output buffer for the ECDH key, but
2403                          * make sure to clear it out afterwards
2404                          */
2405
2406                         field_size = EC_GROUP_get_degree(srvr_group);
2407                         if (field_size <= 0)
2408                                 {
2409                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2410                                        ERR_R_ECDH_LIB);
2411                                 goto err;
2412                                 }
2413                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2414                         if (n <= 0)
2415                                 {
2416                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2417                                        ERR_R_ECDH_LIB);
2418                                 goto err;
2419                                 }
2420
2421                         /* generate master key from the result */
2422                         s->session->master_key_length = s->method->ssl3_enc \
2423                             -> generate_master_secret(s,
2424                                 s->session->master_key,
2425                                 p, n);
2426
2427                         memset(p, 0, n); /* clean up */
2428
2429                         if (ecdh_clnt_cert)
2430                                 {
2431                                 /* Send empty client key exch message */
2432                                 n = 0;
2433                                 }
2434                         else
2435                                 {
2436                                 /* First check the size of encoding and
2437                                  * allocate memory accordingly.
2438                                  */
2439                                 encoded_pt_len =
2440                                     EC_POINT_point2oct(srvr_group,
2441                                         EC_KEY_get0_public_key(clnt_ecdh),
2442                                         POINT_CONVERSION_UNCOMPRESSED,
2443                                         NULL, 0, NULL);
2444
2445                                 encodedPoint = (unsigned char *)
2446                                     OPENSSL_malloc(encoded_pt_len *
2447                                         sizeof(unsigned char));
2448                                 bn_ctx = BN_CTX_new();
2449                                 if ((encodedPoint == NULL) ||
2450                                     (bn_ctx == NULL))
2451                                         {
2452                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2453                                         goto err;
2454                                         }
2455
2456                                 /* Encode the public key */
2457                                 n = EC_POINT_point2oct(srvr_group,
2458                                     EC_KEY_get0_public_key(clnt_ecdh),
2459                                     POINT_CONVERSION_UNCOMPRESSED,
2460                                     encodedPoint, encoded_pt_len, bn_ctx);
2461
2462                                 *p = n; /* length of encoded point */
2463                                 /* Encoded point will be copied here */
2464                                 p += 1;
2465                                 /* copy the point */
2466                                 memcpy((unsigned char *)p, encodedPoint, n);
2467                                 /* increment n to account for length field */
2468                                 n += 1;
2469                                 }
2470
2471                         /* Free allocated memory */
2472                         BN_CTX_free(bn_ctx);
2473                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2474                         if (clnt_ecdh != NULL)
2475                                  EC_KEY_free(clnt_ecdh);
2476                         EVP_PKEY_free(srvr_pub_pkey);
2477                         }
2478 #endif /* !OPENSSL_NO_ECDH */
2479                 else if (alg_k & SSL_kGOST)
2480                         {
2481                         /* GOST key exchange message creation */
2482                         EVP_PKEY_CTX *pkey_ctx;
2483                         X509 *peer_cert;
2484                         size_t msglen;
2485                         unsigned int md_len;
2486                         int keytype;
2487                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2488                         EVP_MD_CTX *ukm_hash;
2489                         EVP_PKEY *pub_key;
2490
2491                         /* Get server sertificate PKEY and create ctx from it */
2492                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2493                         if (!peer_cert)
2494                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2495                         if (!peer_cert)         {
2496                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2497                                         goto err;
2498                                 }
2499
2500                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2501                         /* If we have send a certificate, and certificate key
2502
2503                          * parameters match those of server certificate, use
2504                          * certificate key for key exchange
2505                          */
2506
2507                          /* Otherwise, generate ephemeral key pair */
2508
2509                         EVP_PKEY_encrypt_init(pkey_ctx);
2510                           /* Generate session key */
2511                     RAND_bytes(premaster_secret,32);
2512                         /* If we have client certificate, use its secret as peer key */
2513                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2514                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2515                                         /* If there was an error - just ignore it. Ephemeral key
2516                                         * would be used
2517                                         */
2518                                         ERR_clear_error();
2519                                 }
2520                         }
2521                         /* Compute shared IV and store it in algorithm-specific
2522                          * context data */
2523                         ukm_hash = EVP_MD_CTX_create();
2524                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2525                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2526                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2527                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2528                         EVP_MD_CTX_destroy(ukm_hash);
2529                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2530                                 8,shared_ukm)<0) {
2531                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2532                                                 SSL_R_LIBRARY_BUG);
2533                                         goto err;
2534                                 }
2535                         /* Make GOST keytransport blob message */
2536                         /*Encapsulate it into sequence */
2537                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2538                         msglen=255;
2539                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2540                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2541                                         SSL_R_LIBRARY_BUG);
2542                                 goto err;
2543                         }
2544                         if (msglen >= 0x80)
2545                                 {
2546                                 *(p++)=0x81;
2547                                 *(p++)= msglen & 0xff;
2548                                 n=msglen+3;
2549                                 }
2550                         else
2551                                 {
2552                                 *(p++)= msglen & 0xff;
2553                                 n=msglen+2;
2554                                 }
2555                         memcpy(p, tmp, msglen);
2556                         /* Check if pubkey from client certificate was used */
2557                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2558                                 {
2559                                 /* Set flag "skip certificate verify" */
2560                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2561                                 }
2562                         EVP_PKEY_CTX_free(pkey_ctx);
2563                         s->session->master_key_length=
2564                                 s->method->ssl3_enc->generate_master_secret(s,
2565                                         s->session->master_key,premaster_secret,32);
2566                         EVP_PKEY_free(pub_key);
2567
2568                         }
2569 #ifndef OPENSSL_NO_PSK
2570                 else if (alg_k & SSL_kPSK)
2571                         {
2572                         char identity[PSK_MAX_IDENTITY_LEN];
2573                         unsigned char *t = NULL;
2574                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2575                         unsigned int pre_ms_len = 0, psk_len = 0;
2576                         int psk_err = 1;
2577
2578                         n = 0;
2579                         if (s->psk_client_callback == NULL)
2580                                 {
2581                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2582                                         SSL_R_PSK_NO_CLIENT_CB);
2583                                 goto err;
2584                                 }
2585
2586                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2587                                 identity, PSK_MAX_IDENTITY_LEN,
2588                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2589                         if (psk_len > PSK_MAX_PSK_LEN)
2590                                 {
2591                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2592                                         ERR_R_INTERNAL_ERROR);
2593                                 goto psk_err;
2594                                 }
2595                         else if (psk_len == 0)
2596                                 {
2597                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2598                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2599                                 goto psk_err;
2600                                 }
2601
2602                         /* create PSK pre_master_secret */
2603                         pre_ms_len = 2+psk_len+2+psk_len;
2604                         t = psk_or_pre_ms;
2605                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2606                         s2n(psk_len, t);
2607                         memset(t, 0, psk_len);
2608                         t+=psk_len;
2609                         s2n(psk_len, t);
2610
2611                         if (s->session->psk_identity_hint != NULL)
2612                                 OPENSSL_free(s->session->psk_identity_hint);
2613                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2614                         if (s->ctx->psk_identity_hint != NULL &&
2615                                 s->session->psk_identity_hint == NULL)
2616                                 {
2617                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2618                                         ERR_R_MALLOC_FAILURE);
2619                                 goto psk_err;
2620                                 }
2621
2622                         if (s->session->psk_identity != NULL)
2623                                 OPENSSL_free(s->session->psk_identity);
2624                         s->session->psk_identity = BUF_strdup(identity);
2625                         if (s->session->psk_identity == NULL)
2626                                 {
2627                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2628                                         ERR_R_MALLOC_FAILURE);
2629                                 goto psk_err;
2630                                 }
2631
2632                         s->session->master_key_length =
2633                                 s->method->ssl3_enc->generate_master_secret(s,
2634                                         s->session->master_key,
2635                                         psk_or_pre_ms, pre_ms_len);
2636                         n = strlen(identity);
2637                         s2n(n, p);
2638                         memcpy(p, identity, n);
2639                         n+=2;
2640                         psk_err = 0;
2641                 psk_err:
2642                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2643                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2644                         if (psk_err != 0)
2645                                 {
2646                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2647                                 goto err;
2648                                 }
2649                         }
2650 #endif
2651                 else
2652                         {
2653                         ssl3_send_alert(s, SSL3_AL_FATAL,
2654                             SSL_AD_HANDSHAKE_FAILURE);
2655                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2656                             ERR_R_INTERNAL_ERROR);
2657                         goto err;
2658                         }
2659
2660                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2661                 l2n3(n,d);
2662
2663                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2664                 /* number of bytes to write */
2665                 s->init_num=n+4;
2666                 s->init_off=0;
2667                 }
2668
2669         /* SSL3_ST_CW_KEY_EXCH_B */
2670         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2671 err:
2672 #ifndef OPENSSL_NO_ECDH
2673         BN_CTX_free(bn_ctx);
2674         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2675         if (clnt_ecdh != NULL)
2676                 EC_KEY_free(clnt_ecdh);
2677         EVP_PKEY_free(srvr_pub_pkey);
2678 #endif
2679         return(-1);
2680         }
2681
2682 int ssl3_send_client_verify(SSL *s)
2683         {
2684         unsigned char *p,*d;
2685         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2686         EVP_PKEY *pkey;
2687         EVP_PKEY_CTX *pctx=NULL;
2688 #ifndef OPENSSL_NO_RSA
2689         unsigned u=0;
2690 #endif
2691         unsigned long n;
2692         int j;
2693
2694         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2695                 {
2696                 d=(unsigned char *)s->init_buf->data;
2697                 p= &(d[4]);
2698                 pkey=s->cert->key->privatekey;
2699 /* Create context from key and test if sha1 is allowed as digest */
2700                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2701                 EVP_PKEY_sign_init(pctx);
2702                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2703                         {
2704                         s->method->ssl3_enc->cert_verify_mac(s,
2705                                                 NID_sha1,
2706                                                 &(data[MD5_DIGEST_LENGTH]));
2707                         }
2708                 else
2709                         {
2710                         ERR_clear_error();
2711                         }
2712 #ifndef OPENSSL_NO_RSA
2713                 if (pkey->type == EVP_PKEY_RSA)
2714                         {
2715                         s->method->ssl3_enc->cert_verify_mac(s,
2716                                 NID_md5,
2717                                 &(data[0]));
2718                         if (RSA_sign(NID_md5_sha1, data,
2719                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2720                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2721                                 {
2722                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2723                                 goto err;
2724                                 }
2725                         s2n(u,p);
2726                         n=u+2;
2727                         }
2728                 else
2729 #endif
2730 #ifndef OPENSSL_NO_DSA
2731                         if (pkey->type == EVP_PKEY_DSA)
2732                         {
2733                         if (!DSA_sign(pkey->save_type,
2734                                 &(data[MD5_DIGEST_LENGTH]),
2735                                 SHA_DIGEST_LENGTH,&(p[2]),
2736                                 (unsigned int *)&j,pkey->pkey.dsa))
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2739                                 goto err;
2740                                 }
2741                         s2n(j,p);
2742                         n=j+2;
2743                         }
2744                 else
2745 #endif
2746 #ifndef OPENSSL_NO_ECDSA
2747                         if (pkey->type == EVP_PKEY_EC)
2748                         {
2749                         if (!ECDSA_sign(pkey->save_type,
2750                                 &(data[MD5_DIGEST_LENGTH]),
2751                                 SHA_DIGEST_LENGTH,&(p[2]),
2752                                 (unsigned int *)&j,pkey->pkey.ec))
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2755                                     ERR_R_ECDSA_LIB);
2756                                 goto err;
2757                                 }
2758                         s2n(j,p);
2759                         n=j+2;
2760                         }
2761                 else
2762 #endif
2763                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2764                 {
2765                 unsigned char signbuf[64];
2766                 int i;
2767                 size_t sigsize=64;
2768                 s->method->ssl3_enc->cert_verify_mac(s,
2769                         NID_id_GostR3411_94,
2770                         data);
2771                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2772                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2773                         ERR_R_INTERNAL_ERROR);
2774                         goto err;
2775                 }
2776                 for (i=63,j=0; i>=0; j++, i--) {
2777                         p[2+j]=signbuf[i];
2778                 }
2779                 s2n(j,p);
2780                 n=j+2;
2781                 }
2782                 else
2783                 {
2784                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2785                         goto err;
2786                 }
2787                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2788                 l2n3(n,d);
2789
2790                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2791                 s->init_num=(int)n+4;
2792                 s->init_off=0;
2793                 }
2794         EVP_PKEY_CTX_free(pctx);
2795         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2796 err:
2797         EVP_PKEY_CTX_free(pctx);
2798         return(-1);
2799         }
2800
2801 int ssl3_send_client_certificate(SSL *s)
2802         {
2803         X509 *x509=NULL;
2804         EVP_PKEY *pkey=NULL;
2805         int i;
2806         unsigned long l;
2807
2808         if (s->state == SSL3_ST_CW_CERT_A)
2809                 {
2810                 if ((s->cert == NULL) ||
2811                         (s->cert->key->x509 == NULL) ||
2812                         (s->cert->key->privatekey == NULL))
2813                         s->state=SSL3_ST_CW_CERT_B;
2814                 else
2815                         s->state=SSL3_ST_CW_CERT_C;
2816                 }
2817
2818         /* We need to get a client cert */
2819         if (s->state == SSL3_ST_CW_CERT_B)
2820                 {
2821                 /* If we get an error, we need to
2822                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2823                  * We then get retied later */
2824                 i=0;
2825                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2826                 if (i < 0)
2827                         {
2828                         s->rwstate=SSL_X509_LOOKUP;
2829                         return(-1);
2830                         }
2831                 s->rwstate=SSL_NOTHING;
2832                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2833                         {
2834                         s->state=SSL3_ST_CW_CERT_B;
2835                         if (    !SSL_use_certificate(s,x509) ||
2836                                 !SSL_use_PrivateKey(s,pkey))
2837                                 i=0;
2838                         }
2839                 else if (i == 1)
2840                         {
2841                         i=0;
2842                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2843                         }
2844
2845                 if (x509 != NULL) X509_free(x509);
2846                 if (pkey != NULL) EVP_PKEY_free(pkey);
2847                 if (i == 0)
2848                         {
2849                         if (s->version == SSL3_VERSION)
2850                                 {
2851                                 s->s3->tmp.cert_req=0;
2852                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2853                                 return(1);
2854                                 }
2855                         else
2856                                 {
2857                                 s->s3->tmp.cert_req=2;
2858                                 }
2859                         }
2860
2861                 /* Ok, we have a cert */
2862                 s->state=SSL3_ST_CW_CERT_C;
2863                 }
2864
2865         if (s->state == SSL3_ST_CW_CERT_C)
2866                 {
2867                 s->state=SSL3_ST_CW_CERT_D;
2868                 l=ssl3_output_cert_chain(s,
2869                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2870                 s->init_num=(int)l;
2871                 s->init_off=0;
2872                 }
2873         /* SSL3_ST_CW_CERT_D */
2874         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2875         }
2876
2877 #define has_bits(i,m)   (((i)&(m)) == (m))
2878
2879 int ssl3_check_cert_and_algorithm(SSL *s)
2880         {
2881         int i,idx;
2882         long alg_k,alg_a;
2883         EVP_PKEY *pkey=NULL;
2884         SESS_CERT *sc;
2885 #ifndef OPENSSL_NO_RSA
2886         RSA *rsa;
2887 #endif
2888 #ifndef OPENSSL_NO_DH
2889         DH *dh;
2890 #endif
2891
2892         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2893         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2894
2895         /* we don't have a certificate */
2896         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2897                 return(1);
2898
2899         sc=s->session->sess_cert;
2900         if (sc == NULL)
2901                 {
2902                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2903                 goto err;
2904                 }
2905
2906 #ifndef OPENSSL_NO_RSA
2907         rsa=s->session->sess_cert->peer_rsa_tmp;
2908 #endif
2909 #ifndef OPENSSL_NO_DH
2910         dh=s->session->sess_cert->peer_dh_tmp;
2911 #endif
2912
2913         /* This is the passed certificate */
2914
2915         idx=sc->peer_cert_type;
2916 #ifndef OPENSSL_NO_ECDH
2917         if (idx == SSL_PKEY_ECC)
2918                 {
2919                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2920                     s->s3->tmp.new_cipher) == 0)
2921                         { /* check failed */
2922                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2923                         goto f_err;
2924                         }
2925                 else
2926                         {
2927                         return 1;
2928                         }
2929                 }
2930 #endif
2931         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2932         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2933         EVP_PKEY_free(pkey);
2934
2935
2936         /* Check that we have a certificate if we require one */
2937         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2938                 {
2939                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2940                 goto f_err;
2941                 }
2942 #ifndef OPENSSL_NO_DSA
2943         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2944                 {
2945                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2946                 goto f_err;
2947                 }
2948 #endif
2949 #ifndef OPENSSL_NO_RSA
2950         if ((alg_k & SSL_kRSA) &&
2951                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2952                 {
2953                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2954                 goto f_err;
2955                 }
2956 #endif
2957 #ifndef OPENSSL_NO_DH
2958         if ((alg_k & SSL_kEDH) &&
2959                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2960                 {
2961                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2962                 goto f_err;
2963                 }
2964         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2965                 {
2966                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2967                 goto f_err;
2968                 }
2969 #ifndef OPENSSL_NO_DSA
2970         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2971                 {
2972                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2973                 goto f_err;
2974                 }
2975 #endif
2976 #endif
2977
2978         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2979                 {
2980 #ifndef OPENSSL_NO_RSA
2981                 if (alg_k & SSL_kRSA)
2982                         {
2983                         if (rsa == NULL
2984                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2985                                 {
2986                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2987                                 goto f_err;
2988                                 }
2989                         }
2990                 else
2991 #endif
2992 #ifndef OPENSSL_NO_DH
2993                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2994                             {
2995                             if (dh == NULL
2996                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2997                                 {
2998                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2999                                 goto f_err;
3000                                 }
3001                         }
3002                 else
3003 #endif
3004                         {
3005                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3006                         goto f_err;
3007                         }
3008                 }
3009         return(1);
3010 f_err:
3011         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3012 err:
3013         return(0);
3014         }
3015
3016 /* Check to see if handshake is full or resumed. Usually this is just a
3017  * case of checking to see if a cache hit has occurred. In the case of
3018  * session tickets we have to check the next message to be sure.
3019  */
3020
3021 #ifndef OPENSSL_NO_TLSEXT
3022 # ifndef OPENSSL_NO_NEXTPROTONEG
3023 int ssl3_send_next_proto(SSL *s)
3024         {
3025         unsigned int len, padding_len;
3026         unsigned char *d;
3027
3028         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3029                 {
3030                 len = s->next_proto_negotiated_len;
3031                 padding_len = 32 - ((len + 2) % 32);
3032                 d = (unsigned char *)s->init_buf->data;
3033                 d[4] = len;
3034                 memcpy(d + 5, s->next_proto_negotiated, len);
3035                 d[5 + len] = padding_len;
3036                 memset(d + 6 + len, 0, padding_len);
3037                 *(d++)=SSL3_MT_NEXT_PROTO;
3038                 l2n3(2 + len + padding_len, d);
3039                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3040                 s->init_num = 4 + 2 + len + padding_len;
3041                 s->init_off = 0;
3042                 }
3043
3044         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3045         }
3046 # endif
3047
3048 int ssl3_check_finished(SSL *s)
3049         {
3050         int ok;
3051         long n;
3052         /* If we have no ticket it cannot be a resumed session. */
3053         if (!s->session->tlsext_tick)
3054                 return 1;
3055         /* this function is called when we really expect a Certificate
3056          * message, so permit appropriate message length */
3057         n=s->method->ssl_get_message(s,
3058                 SSL3_ST_CR_CERT_A,
3059                 SSL3_ST_CR_CERT_B,
3060                 -1,
3061                 s->max_cert_list,
3062                 &ok);
3063         if (!ok) return((int)n);
3064         s->s3->tmp.reuse_message = 1;
3065         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3066                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3067                 return 2;
3068
3069         return 1;
3070         }
3071 #endif
3072
3073 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3074         {
3075         int i = 0;
3076 #ifndef OPENSSL_NO_ENGINE
3077         if (s->ctx->client_cert_engine)
3078                 {
3079                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3080                                                 SSL_get_client_CA_list(s),
3081                                                 px509, ppkey, NULL, NULL, NULL);
3082                 if (i != 0)
3083                         return i;
3084                 }
3085 #endif
3086         if (s->ctx->client_cert_cb)
3087                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3088         return i;
3089         }