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 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206         for (;;)
 207                 {
 208                 state=s->state;
 209
 210                 switch(s->state)
 211                         {
 212                 case SSL_ST_RENEGOTIATE:
 213                         s->renegotiate=1;
 214                         s->state=SSL_ST_CONNECT;
 215                         s->ctx->stats.sess_connect_renegotiate++;
 216                         /* break */
 217                 case SSL_ST_BEFORE:
 218                 case SSL_ST_CONNECT:
 219                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 220                 case SSL_ST_OK|SSL_ST_CONNECT:
 221
 222                         s->server=0;
 223                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 224
 225                         if ((s->version & 0xff00 ) != 0x0300)
 226                                 {
 227                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 228                                 ret = -1;
 229                                 goto end;
 230                                 }
 231
 232                         /* s->version=SSL3_VERSION; */
 233                         s->type=SSL_ST_CONNECT;
 234
 235                         if (s->init_buf == NULL)
 236                                 {
 237                                 if ((buf=BUF_MEM_new()) == NULL)
 238                                         {
 239                                         ret= -1;
 240                                         goto end;
 241                                         }
 242                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 243                                         {
 244                                         ret= -1;
 245                                         goto end;
 246                                         }
 247                                 s->init_buf=buf;
 248                                 buf=NULL;
 249                                 }
 250
 251                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 252
 253                         /* setup buffing BIO */
 254                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 255
 256                         /* don't push the buffering BIO quite yet */
 257
 258                         ssl3_init_finished_mac(s);
 259
 260                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 261                         s->ctx->stats.sess_connect++;
 262                         s->init_num=0;
 263                         break;
 264
 265                 case SSL3_ST_CW_CLNT_HELLO_A:
 266                 case SSL3_ST_CW_CLNT_HELLO_B:
 267
 268                         s->shutdown=0;
 269                         ret=ssl3_client_hello(s);
 270                         if (ret <= 0) goto end;
 271                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 272                         s->init_num=0;
 273
 274                         /* turn on buffering for the next lot of output */
 275                         if (s->bbio != s->wbio)
 276                                 s->wbio=BIO_push(s->bbio,s->wbio);
 277
 278                         break;
 279
 280                 case SSL3_ST_CR_SRVR_HELLO_A:
 281                 case SSL3_ST_CR_SRVR_HELLO_B:
 282                         ret=ssl3_get_server_hello(s);
 283 #ifndef OPENSSL_NO_SRP
 284                         if (ret == 0 && s->s3->warn_alert == SSL_AD_MISSING_SRP_USERNAME)
 285                                 {
 286                                 if (!SRP_have_to_put_srp_username(s))
 287                                         {
 288                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_MISSING_SRP_USERNAME);
 289                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_USER_CANCELLED);
 290                                         goto end;
 291                                         }
 292                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 293                                 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 294                                 break;
 295                                 }
 296 #endif
 297                         if (ret <= 0) goto end;
 298
 299                         if (s->hit)
 300                                 {
 301                                 s->state=SSL3_ST_CR_FINISHED_A;
 302 #ifndef OPENSSL_NO_TLSEXT
 303                                 if (s->tlsext_ticket_expected)
 304                                         {
 305                                         /* receive renewed session ticket */
 306                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 307                                         }
 308 #endif
 309                                 }
 310                         else
 311                                 s->state=SSL3_ST_CR_CERT_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_CR_CERT_A:
 316                 case SSL3_ST_CR_CERT_B:
 317 #ifndef OPENSSL_NO_TLSEXT
 318                         ret=ssl3_check_finished(s);
 319                         if (ret <= 0) goto end;
 320                         if (ret == 2)
 321                                 {
 322                                 s->hit = 1;
 323                                 if (s->tlsext_ticket_expected)
 324                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 325                                 else
 326                                         s->state=SSL3_ST_CR_FINISHED_A;
 327                                 s->init_num=0;
 328                                 break;
 329                                 }
 330 #endif
 331                         /* Check if it is anon DH/ECDH */
 332                         /* or PSK */
 333                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 334                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 335                                 {
 336                                 ret=ssl3_get_server_certificate(s);
 337                                 if (ret <= 0) goto end;
 338 #ifndef OPENSSL_NO_TLSEXT
 339                                 if (s->tlsext_status_expected)
 340                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 341                                 else
 342                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 343                                 }
 344                         else
 345                                 {
 346                                 skip = 1;
 347                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 348                                 }
 349 #else
 350                                 }
 351                         else
 352                                 skip=1;
 353
 354                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 355 #endif
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_CR_KEY_EXCH_A:
 360                 case SSL3_ST_CR_KEY_EXCH_B:
 361                         ret=ssl3_get_key_exchange(s);
 362                         if (ret <= 0) goto end;
 363                         s->state=SSL3_ST_CR_CERT_REQ_A;
 364                         s->init_num=0;
 365
 366                         /* at this point we check that we have the
 367                          * required stuff from the server */
 368                         if (!ssl3_check_cert_and_algorithm(s))
 369                                 {
 370                                 ret= -1;
 371                                 goto end;
 372                                 }
 373                         break;
 374
 375                 case SSL3_ST_CR_CERT_REQ_A:
 376                 case SSL3_ST_CR_CERT_REQ_B:
 377                         ret=ssl3_get_certificate_request(s);
 378                         if (ret <= 0) goto end;
 379                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_CR_SRVR_DONE_A:
 384                 case SSL3_ST_CR_SRVR_DONE_B:
 385                         ret=ssl3_get_server_done(s);
 386                         if (ret <= 0) goto end;
 387 #ifndef OPENSSL_NO_SRP
 388                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 389                                 {
 390                                 if ((ret = SRP_Calc_A_param(s))<=0)
 391                                         {
 392                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 393                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 394                                         goto end;
 395                                         }
 396                                 }
 397 #endif
 398                         if (s->s3->tmp.cert_req)
 399                                 s->state=SSL3_ST_CW_CERT_A;
 400                         else
 401                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 402                         s->init_num=0;
 403
 404                         break;
 405
 406                 case SSL3_ST_CW_CERT_A:
 407                 case SSL3_ST_CW_CERT_B:
 408                 case SSL3_ST_CW_CERT_C:
 409                 case SSL3_ST_CW_CERT_D:
 410                         ret=ssl3_send_client_certificate(s);
 411                         if (ret <= 0) goto end;
 412                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_CW_KEY_EXCH_A:
 417                 case SSL3_ST_CW_KEY_EXCH_B:
 418                         ret=ssl3_send_client_key_exchange(s);
 419                         if (ret <= 0) goto end;
 420                         /* EAY EAY EAY need to check for DH fix cert
 421                          * sent back */
 422                         /* For TLS, cert_req is set to 2, so a cert chain
 423                          * of nothing is sent, but no verify packet is sent */
 424                         /* XXX: For now, we do not support client
 425                          * authentication in ECDH cipher suites with
 426                          * ECDH (rather than ECDSA) certificates.
 427                          * We need to skip the certificate verify
 428                          * message when client's ECDH public key is sent
 429                          * inside the client certificate.
 430                          */
 431                         if (s->s3->tmp.cert_req == 1)
 432                                 {
 433                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 434                                 }
 435                         else
 436                                 {
 437                                 s->state=SSL3_ST_CW_CHANGE_A;
 438                                 s->s3->change_cipher_spec=0;
 439                                 }
 440                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 441                                 {
 442                                 s->state=SSL3_ST_CW_CHANGE_A;
 443                                 s->s3->change_cipher_spec=0;
 444                                 }
 445
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_CW_CERT_VRFY_A:
 450                 case SSL3_ST_CW_CERT_VRFY_B:
 451                         ret=ssl3_send_client_verify(s);
 452                         if (ret <= 0) goto end;
 453                         s->state=SSL3_ST_CW_CHANGE_A;
 454                         s->init_num=0;
 455                         s->s3->change_cipher_spec=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_CHANGE_A:
 459                 case SSL3_ST_CW_CHANGE_B:
 460                         ret=ssl3_send_change_cipher_spec(s,
 461                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 462                         if (ret <= 0) goto end;
 463                         s->state=SSL3_ST_CW_FINISHED_A;
 464                         s->init_num=0;
 465
 466                         s->session->cipher=s->s3->tmp.new_cipher;
 467 #ifdef OPENSSL_NO_COMP
 468                         s->session->compress_meth=0;
 469 #else
 470                         if (s->s3->tmp.new_compression == NULL)
 471                                 s->session->compress_meth=0;
 472                         else
 473                                 s->session->compress_meth=
 474                                         s->s3->tmp.new_compression->id;
 475 #endif
 476                         if (!s->method->ssl3_enc->setup_key_block(s))
 477                                 {
 478                                 ret= -1;
 479                                 goto end;
 480                                 }
 481
 482                         if (!s->method->ssl3_enc->change_cipher_state(s,
 483                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 484                                 {
 485                                 ret= -1;
 486                                 goto end;
 487                                 }
 488
 489                         break;
 490
 491                 case SSL3_ST_CW_FINISHED_A:
 492                 case SSL3_ST_CW_FINISHED_B:
 493                         ret=ssl3_send_finished(s,
 494                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 495                                 s->method->ssl3_enc->client_finished_label,
 496                                 s->method->ssl3_enc->client_finished_label_len);
 497                         if (ret <= 0) goto end;
 498                         s->state=SSL3_ST_CW_FLUSH;
 499
 500                         /* clear flags */
 501                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 502                         if (s->hit)
 503                                 {
 504                                 s->s3->tmp.next_state=SSL_ST_OK;
 505                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 506                                         {
 507                                         s->state=SSL_ST_OK;
 508                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 509                                         s->s3->delay_buf_pop_ret=0;
 510                                         }
 511                                 }
 512                         else
 513                                 {
 514 #ifndef OPENSSL_NO_TLSEXT
 515                                 /* Allow NewSessionTicket if ticket expected */
 516                                 if (s->tlsext_ticket_expected)
 517                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 518                                 else
 519 #endif
 520
 521                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 522                                 }
 523                         s->init_num=0;
 524                         break;
 525
 526 #ifndef OPENSSL_NO_TLSEXT
 527                 case SSL3_ST_CR_SESSION_TICKET_A:
 528                 case SSL3_ST_CR_SESSION_TICKET_B:
 529                         ret=ssl3_get_new_session_ticket(s);
 530                         if (ret <= 0) goto end;
 531                         s->state=SSL3_ST_CR_FINISHED_A;
 532                         s->init_num=0;
 533                 break;
 534
 535                 case SSL3_ST_CR_CERT_STATUS_A:
 536                 case SSL3_ST_CR_CERT_STATUS_B:
 537                         ret=ssl3_get_cert_status(s);
 538                         if (ret <= 0) goto end;
 539                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 540                         s->init_num=0;
 541                 break;
 542 #endif
 543
 544                 case SSL3_ST_CR_FINISHED_A:
 545                 case SSL3_ST_CR_FINISHED_B:
 546
 547                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 548                                 SSL3_ST_CR_FINISHED_B);
 549                         if (ret <= 0) goto end;
 550
 551                         if (s->hit)
 552                                 s->state=SSL3_ST_CW_CHANGE_A;
 553                         else
 554                                 s->state=SSL_ST_OK;
 555                         s->init_num=0;
 556                         break;
 557
 558                 case SSL3_ST_CW_FLUSH:
 559                         s->rwstate=SSL_WRITING;
 560                         if (BIO_flush(s->wbio) <= 0)
 561                                 {
 562                                 ret= -1;
 563                                 goto end;
 564                                 }
 565                         s->rwstate=SSL_NOTHING;
 566                         s->state=s->s3->tmp.next_state;
 567                         break;
 568
 569                 case SSL_ST_OK:
 570                         /* clean a few things up */
 571                         ssl3_cleanup_key_block(s);
 572
 573                         if (s->init_buf != NULL)
 574                                 {
 575                                 BUF_MEM_free(s->init_buf);
 576                                 s->init_buf=NULL;
 577                                 }
 578
 579                         /* If we are not 'joining' the last two packets,
 580                          * remove the buffering now */
 581                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 582                                 ssl_free_wbio_buffer(s);
 583                         /* else do it later in ssl3_write */
 584
 585                         s->init_num=0;
 586                         s->renegotiate=0;
 587                         s->new_session=0;
 588
 589                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 590                         if (s->hit) s->ctx->stats.sess_hit++;
 591
 592                         ret=1;
 593                         /* s->server=0; */
 594                         s->handshake_func=ssl3_connect;
 595                         s->ctx->stats.sess_connect_good++;
 596
 597                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 598
 599                         goto end;
 600                         /* break; */
 601
 602                 default:
 603                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 604                         ret= -1;
 605                         goto end;
 606                         /* break; */
 607                         }
 608
 609                 /* did we do anything */
 610                 if (!s->s3->tmp.reuse_message && !skip)
 611                         {
 612                         if (s->debug)
 613                                 {
 614                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 615                                         goto end;
 616                                 }
 617
 618                         if ((cb != NULL) && (s->state != state))
 619                                 {
 620                                 new_state=s->state;
 621                                 s->state=state;
 622                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 623                                 s->state=new_state;
 624                                 }
 625                         }
 626                 skip=0;
 627                 }
 628 end:
 629         s->in_handshake--;
 630         if (buf != NULL)
 631                 BUF_MEM_free(buf);
 632         if (cb != NULL)
 633                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 634         return(ret);
 635         }
 636
 637
 638 int ssl3_client_hello(SSL *s)
 639         {
 640         unsigned char *buf;
 641         unsigned char *p,*d;
 642         int i;
 643         unsigned long Time,l;
 644 #ifndef OPENSSL_NO_COMP
 645         int j;
 646         SSL_COMP *comp;
 647 #endif
 648
 649         buf=(unsigned char *)s->init_buf->data;
 650         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 651                 {
 652                 SSL_SESSION *sess = s->session;
 653                 if ((sess == NULL) ||
 654                         (sess->ssl_version != s->version) ||
 655 #ifdef OPENSSL_NO_TLSEXT
 656                         !sess->session_id_length ||
 657 #else
 658                         (!sess->session_id_length && !sess->tlsext_tick) ||
 659 #endif
 660                         (sess->not_resumable))
 661                         {
 662                         if (!ssl_get_new_session(s,0))
 663                                 goto err;
 664                         }
 665                 /* else use the pre-loaded session */
 666
 667                 p=s->s3->client_random;
 668                 Time=(unsigned long)time(NULL);                 /* Time */
 669                 l2n(Time,p);
 670                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 671                         goto err;
 672
 673                 /* Do the message type and length last */
 674                 d=p= &(buf[4]);
 675
 676                 *(p++)=s->version>>8;
 677                 *(p++)=s->version&0xff;
 678                 s->client_version=s->version;
 679
 680                 /* Random stuff */
 681                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 682                 p+=SSL3_RANDOM_SIZE;
 683
 684                 /* Session ID */
 685                 if (s->new_session)
 686                         i=0;
 687                 else
 688                         i=s->session->session_id_length;
 689                 *(p++)=i;
 690                 if (i != 0)
 691                         {
 692                         if (i > (int)sizeof(s->session->session_id))
 693                                 {
 694                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 695                                 goto err;
 696                                 }
 697                         memcpy(p,s->session->session_id,i);
 698                         p+=i;
 699                         }
 700
 701                 /* Ciphers supported */
 702                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 703                 if (i == 0)
 704                         {
 705                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 706                         goto err;
 707                         }
 708                 s2n(i,p);
 709                 p+=i;
 710
 711                 /* COMPRESSION */
 712 #ifdef OPENSSL_NO_COMP
 713                 *(p++)=1;
 714 #else
 715
 716                 if ((s->options & SSL_OP_NO_COMPRESSION)
 717                                         || !s->ctx->comp_methods)
 718                         j=0;
 719                 else
 720                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 721                 *(p++)=1+j;
 722                 for (i=0; i<j; i++)
 723                         {
 724                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 725                         *(p++)=comp->id;
 726                         }
 727 #endif
 728                 *(p++)=0; /* Add the NULL method */
 729
 730 #ifndef OPENSSL_NO_TLSEXT
 731                 /* TLS extensions*/
 732                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 733                         {
 734                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 735                         goto err;
 736                         }
 737                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 738                         {
 739                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 740                         goto err;
 741                         }
 742 #endif
 743
 744                 l=(p-d);
 745                 d=buf;
 746                 *(d++)=SSL3_MT_CLIENT_HELLO;
 747                 l2n3(l,d);
 748
 749                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 750                 /* number of bytes to write */
 751                 s->init_num=p-buf;
 752                 s->init_off=0;
 753                 }
 754
 755         /* SSL3_ST_CW_CLNT_HELLO_B */
 756         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 757 err:
 758         return(-1);
 759         }
 760
 761 int ssl3_get_server_hello(SSL *s)
 762         {
 763         STACK_OF(SSL_CIPHER) *sk;
 764         const SSL_CIPHER *c;
 765         unsigned char *p,*d;
 766         int i,al,ok;
 767         unsigned int j;
 768         long n;
 769 #ifndef OPENSSL_NO_COMP
 770         SSL_COMP *comp;
 771 #endif
 772
 773         n=s->method->ssl_get_message(s,
 774                 SSL3_ST_CR_SRVR_HELLO_A,
 775                 SSL3_ST_CR_SRVR_HELLO_B,
 776                 -1,
 777                 20000, /* ?? */
 778                 &ok);
 779
 780         if (!ok) return((int)n);
 781
 782         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 783                 {
 784                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 785                         {
 786                         if ( s->d1->send_cookie == 0)
 787                                 {
 788                                 s->s3->tmp.reuse_message = 1;
 789                                 return 1;
 790                                 }
 791                         else /* already sent a cookie */
 792                                 {
 793                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 794                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 795                                 goto f_err;
 796                                 }
 797                         }
 798                 }
 799
 800         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 801                 {
 802                 al=SSL_AD_UNEXPECTED_MESSAGE;
 803                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 804                 goto f_err;
 805                 }
 806
 807         d=p=(unsigned char *)s->init_msg;
 808
 809         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 810                 {
 811                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 812                 s->version=(s->version&0xff00)|p[1];
 813                 al=SSL_AD_PROTOCOL_VERSION;
 814                 goto f_err;
 815                 }
 816         p+=2;
 817
 818         /* load the server hello data */
 819         /* load the server random */
 820         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 821         p+=SSL3_RANDOM_SIZE;
 822
 823         /* get the session-id */
 824         j= *(p++);
 825
 826         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 827                 {
 828                 al=SSL_AD_ILLEGAL_PARAMETER;
 829                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 830                 goto f_err;
 831                 }
 832
 833 #ifndef OPENSSL_NO_TLSEXT
 834         /* check if we want to resume the session based on external pre-shared secret */
 835         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 836                 {
 837                 SSL_CIPHER *pref_cipher=NULL;
 838                 s->session->master_key_length=sizeof(s->session->master_key);
 839                 if (s->tls_session_secret_cb(s, s->session->master_key,
 840                                              &s->session->master_key_length,
 841                                              NULL, &pref_cipher,
 842                                              s->tls_session_secret_cb_arg))
 843                         {
 844                         s->session->cipher = pref_cipher ?
 845                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 846                         }
 847                 }
 848 #endif /* OPENSSL_NO_TLSEXT */
 849
 850         if (j != 0 && j == s->session->session_id_length
 851             && memcmp(p,s->session->session_id,j) == 0)
 852             {
 853             if(s->sid_ctx_length != s->session->sid_ctx_length
 854                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 855                 {
 856                 /* actually a client application bug */
 857                 al=SSL_AD_ILLEGAL_PARAMETER;
 858                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 859                 goto f_err;
 860                 }
 861             s->hit=1;
 862             }
 863         else    /* a miss or crap from the other end */
 864                 {
 865                 /* If we were trying for session-id reuse, make a new
 866                  * SSL_SESSION so we don't stuff up other people */
 867                 s->hit=0;
 868                 if (s->session->session_id_length > 0)
 869                         {
 870                         if (!ssl_get_new_session(s,0))
 871                                 {
 872                                 al=SSL_AD_INTERNAL_ERROR;
 873                                 goto f_err;
 874                                 }
 875                         }
 876                 s->session->session_id_length=j;
 877                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 878                 }
 879         p+=j;
 880         c=ssl_get_cipher_by_char(s,p);
 881         if (c == NULL)
 882                 {
 883                 /* unknown cipher */
 884                 al=SSL_AD_ILLEGAL_PARAMETER;
 885                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 886                 goto f_err;
 887                 }
 888         /* TLS v1.2 only ciphersuites require v1.2 or later */
 889         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 890                 (TLS1_get_version(s) < TLS1_2_VERSION))
 891                 {
 892                 al=SSL_AD_ILLEGAL_PARAMETER;
 893                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 894                 goto f_err;
 895                 }
 896         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 897
 898         sk=ssl_get_ciphers_by_id(s);
 899         i=sk_SSL_CIPHER_find(sk,c);
 900         if (i < 0)
 901                 {
 902                 /* we did not say we would use this cipher */
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 905                 goto f_err;
 906                 }
 907
 908         /* Depending on the session caching (internal/external), the cipher
 909            and/or cipher_id values may not be set. Make sure that
 910            cipher_id is set and use it for comparison. */
 911         if (s->session->cipher)
 912                 s->session->cipher_id = s->session->cipher->id;
 913         if (s->hit && (s->session->cipher_id != c->id))
 914                 {
 915 /* Workaround is now obsolete */
 916 #if 0
 917                 if (!(s->options &
 918                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 919 #endif
 920                         {
 921                         al=SSL_AD_ILLEGAL_PARAMETER;
 922                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 923                         goto f_err;
 924                         }
 925                 }
 926         s->s3->tmp.new_cipher=c;
 927         /* Don't digest cached records if TLS v1.2: we may need them for
 928          * client authentication.
 929          */
 930         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 931                 goto f_err;
 932         /* lets get the compression algorithm */
 933         /* COMPRESSION */
 934 #ifdef OPENSSL_NO_COMP
 935         if (*(p++) != 0)
 936                 {
 937                 al=SSL_AD_ILLEGAL_PARAMETER;
 938                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 939                 goto f_err;
 940                 }
 941         /* If compression is disabled we'd better not try to resume a session
 942          * using compression.
 943          */
 944         if (s->session->compress_meth != 0)
 945                 {
 946                 al=SSL_AD_INTERNAL_ERROR;
 947                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 948                 goto f_err;
 949                 }
 950 #else
 951         j= *(p++);
 952         if (s->hit && j != s->session->compress_meth)
 953                 {
 954                 al=SSL_AD_ILLEGAL_PARAMETER;
 955                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 956                 goto f_err;
 957                 }
 958         if (j == 0)
 959                 comp=NULL;
 960         else if (s->options & SSL_OP_NO_COMPRESSION)
 961                 {
 962                 al=SSL_AD_ILLEGAL_PARAMETER;
 963                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 964                 goto f_err;
 965                 }
 966         else
 967                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 968
 969         if ((j != 0) && (comp == NULL))
 970                 {
 971                 al=SSL_AD_ILLEGAL_PARAMETER;
 972                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 973                 goto f_err;
 974                 }
 975         else
 976                 {
 977                 s->s3->tmp.new_compression=comp;
 978                 }
 979 #endif
 980
 981 #ifndef OPENSSL_NO_TLSEXT
 982         /* TLS extensions*/
 983         if (s->version >= SSL3_VERSION)
 984                 {
 985                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 986                         {
 987                         /* 'al' set by ssl_parse_serverhello_tlsext */
 988                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 989                         goto f_err;
 990                         }
 991                 if (ssl_check_serverhello_tlsext(s) <= 0)
 992                         {
 993                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 994                                 goto err;
 995                         }
 996                 }
 997 #endif
 998
 999         if (p != (d+n))
1000                 {
1001                 /* wrong packet length */
1002                 al=SSL_AD_DECODE_ERROR;
1003                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1004                 goto err;
1005                 }
1006
1007         return(1);
1008 f_err:
1009         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1010 err:
1011         return(-1);
1012         }
1013
1014 int ssl3_get_server_certificate(SSL *s)
1015         {
1016         int al,i,ok,ret= -1;
1017         unsigned long n,nc,llen,l;
1018         X509 *x=NULL;
1019         const unsigned char *q,*p;
1020         unsigned char *d;
1021         STACK_OF(X509) *sk=NULL;
1022         SESS_CERT *sc;
1023         EVP_PKEY *pkey=NULL;
1024         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1025
1026         n=s->method->ssl_get_message(s,
1027                 SSL3_ST_CR_CERT_A,
1028                 SSL3_ST_CR_CERT_B,
1029                 -1,
1030                 s->max_cert_list,
1031                 &ok);
1032
1033         if (!ok) return((int)n);
1034
1035         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1036                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1037                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1038                 {
1039                 s->s3->tmp.reuse_message=1;
1040                 return(1);
1041                 }
1042
1043         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1044                 {
1045                 al=SSL_AD_UNEXPECTED_MESSAGE;
1046                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1047                 goto f_err;
1048                 }
1049         p=d=(unsigned char *)s->init_msg;
1050
1051         if ((sk=sk_X509_new_null()) == NULL)
1052                 {
1053                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1054                 goto err;
1055                 }
1056
1057         n2l3(p,llen);
1058         if (llen+3 != n)
1059                 {
1060                 al=SSL_AD_DECODE_ERROR;
1061                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1062                 goto f_err;
1063                 }
1064         for (nc=0; nc<llen; )
1065                 {
1066                 n2l3(p,l);
1067                 if ((l+nc+3) > llen)
1068                         {
1069                         al=SSL_AD_DECODE_ERROR;
1070                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1071                         goto f_err;
1072                         }
1073
1074                 q=p;
1075                 x=d2i_X509(NULL,&q,l);
1076                 if (x == NULL)
1077                         {
1078                         al=SSL_AD_BAD_CERTIFICATE;
1079                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1080                         goto f_err;
1081                         }
1082                 if (q != (p+l))
1083                         {
1084                         al=SSL_AD_DECODE_ERROR;
1085                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1086                         goto f_err;
1087                         }
1088                 if (!sk_X509_push(sk,x))
1089                         {
1090                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1091                         goto err;
1092                         }
1093                 x=NULL;
1094                 nc+=l+3;
1095                 p=q;
1096                 }
1097
1098         i=ssl_verify_cert_chain(s,sk);
1099         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1100 #ifndef OPENSSL_NO_KRB5
1101             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1102                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1103 #endif /* OPENSSL_NO_KRB5 */
1104                 )
1105                 {
1106                 al=ssl_verify_alarm_type(s->verify_result);
1107                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1108                 goto f_err;
1109                 }
1110         ERR_clear_error(); /* but we keep s->verify_result */
1111
1112         sc=ssl_sess_cert_new();
1113         if (sc == NULL) goto err;
1114
1115         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1116         s->session->sess_cert=sc;
1117
1118         sc->cert_chain=sk;
1119         /* Inconsistency alert: cert_chain does include the peer's
1120          * certificate, which we don't include in s3_srvr.c */
1121         x=sk_X509_value(sk,0);
1122         sk=NULL;
1123         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1124
1125         pkey=X509_get_pubkey(x);
1126
1127         /* VRS: allow null cert if auth == KRB5 */
1128         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1129                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1130                     ? 0 : 1;
1131
1132 #ifdef KSSL_DEBUG
1133         printf("pkey,x = %p, %p\n", pkey,x);
1134         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1135         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1136                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1137 #endif    /* KSSL_DEBUG */
1138
1139         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1140                 {
1141                 x=NULL;
1142                 al=SSL3_AL_FATAL;
1143                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1144                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1145                 goto f_err;
1146                 }
1147
1148         i=ssl_cert_type(x,pkey);
1149         if (need_cert && i < 0)
1150                 {
1151                 x=NULL;
1152                 al=SSL3_AL_FATAL;
1153                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1154                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1155                 goto f_err;
1156                 }
1157
1158         if (need_cert)
1159                 {
1160                 sc->peer_cert_type=i;
1161                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1162                 /* Why would the following ever happen?
1163                  * We just created sc a couple of lines ago. */
1164                 if (sc->peer_pkeys[i].x509 != NULL)
1165                         X509_free(sc->peer_pkeys[i].x509);
1166                 sc->peer_pkeys[i].x509=x;
1167                 sc->peer_key= &(sc->peer_pkeys[i]);
1168
1169                 if (s->session->peer != NULL)
1170                         X509_free(s->session->peer);
1171                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1172                 s->session->peer=x;
1173                 }
1174         else
1175                 {
1176                 sc->peer_cert_type=i;
1177                 sc->peer_key= NULL;
1178
1179                 if (s->session->peer != NULL)
1180                         X509_free(s->session->peer);
1181                 s->session->peer=NULL;
1182                 }
1183         s->session->verify_result = s->verify_result;
1184
1185         x=NULL;
1186         ret=1;
1187
1188         if (0)
1189                 {
1190 f_err:
1191                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1192                 }
1193 err:
1194         EVP_PKEY_free(pkey);
1195         X509_free(x);
1196         sk_X509_pop_free(sk,X509_free);
1197         return(ret);
1198         }
1199
1200 int ssl3_get_key_exchange(SSL *s)
1201         {
1202 #ifndef OPENSSL_NO_RSA
1203         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1204 #endif
1205         EVP_MD_CTX md_ctx;
1206         unsigned char *param,*p;
1207         int al,i,j,param_len,ok;
1208         long n,alg_k,alg_a;
1209         EVP_PKEY *pkey=NULL;
1210         const EVP_MD *md = NULL;
1211 #ifndef OPENSSL_NO_RSA
1212         RSA *rsa=NULL;
1213 #endif
1214 #ifndef OPENSSL_NO_DH
1215         DH *dh=NULL;
1216 #endif
1217 #ifndef OPENSSL_NO_ECDH
1218         EC_KEY *ecdh = NULL;
1219         BN_CTX *bn_ctx = NULL;
1220         EC_POINT *srvr_ecpoint = NULL;
1221         int curve_nid = 0;
1222         int encoded_pt_len = 0;
1223 #endif
1224
1225         /* use same message size as in ssl3_get_certificate_request()
1226          * as ServerKeyExchange message may be skipped */
1227         n=s->method->ssl_get_message(s,
1228                 SSL3_ST_CR_KEY_EXCH_A,
1229                 SSL3_ST_CR_KEY_EXCH_B,
1230                 -1,
1231                 s->max_cert_list,
1232                 &ok);
1233         if (!ok) return((int)n);
1234
1235         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1236                 {
1237 #ifndef OPENSSL_NO_PSK
1238                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1239                    omitted if no identity hint is sent. Set
1240                    session->sess_cert anyway to avoid problems
1241                    later.*/
1242                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1243                         {
1244                         s->session->sess_cert=ssl_sess_cert_new();
1245                         if (s->ctx->psk_identity_hint)
1246                                 OPENSSL_free(s->ctx->psk_identity_hint);
1247                         s->ctx->psk_identity_hint = NULL;
1248                         }
1249 #endif
1250                 s->s3->tmp.reuse_message=1;
1251                 return(1);
1252                 }
1253
1254         param=p=(unsigned char *)s->init_msg;
1255         if (s->session->sess_cert != NULL)
1256                 {
1257 #ifndef OPENSSL_NO_RSA
1258                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1259                         {
1260                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1261                         s->session->sess_cert->peer_rsa_tmp=NULL;
1262                         }
1263 #endif
1264 #ifndef OPENSSL_NO_DH
1265                 if (s->session->sess_cert->peer_dh_tmp)
1266                         {
1267                         DH_free(s->session->sess_cert->peer_dh_tmp);
1268                         s->session->sess_cert->peer_dh_tmp=NULL;
1269                         }
1270 #endif
1271 #ifndef OPENSSL_NO_ECDH
1272                 if (s->session->sess_cert->peer_ecdh_tmp)
1273                         {
1274                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1275                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1276                         }
1277 #endif
1278                 }
1279         else
1280                 {
1281                 s->session->sess_cert=ssl_sess_cert_new();
1282                 }
1283
1284         param_len=0;
1285         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1286         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1287         EVP_MD_CTX_init(&md_ctx);
1288
1289 #ifndef OPENSSL_NO_PSK
1290         if (alg_k & SSL_kPSK)
1291                 {
1292                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1293
1294                 al=SSL_AD_HANDSHAKE_FAILURE;
1295                 n2s(p,i);
1296                 param_len=i+2;
1297                 /* Store PSK identity hint for later use, hint is used
1298                  * in ssl3_send_client_key_exchange.  Assume that the
1299                  * maximum length of a PSK identity hint can be as
1300                  * long as the maximum length of a PSK identity. */
1301                 if (i > PSK_MAX_IDENTITY_LEN)
1302                         {
1303                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1304                                 SSL_R_DATA_LENGTH_TOO_LONG);
1305                         goto f_err;
1306                         }
1307                 if (param_len > n)
1308                         {
1309                         al=SSL_AD_DECODE_ERROR;
1310                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1311                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1312                         goto f_err;
1313                         }
1314                 /* If received PSK identity hint contains NULL
1315                  * characters, the hint is truncated from the first
1316                  * NULL. p may not be ending with NULL, so create a
1317                  * NULL-terminated string. */
1318                 memcpy(tmp_id_hint, p, i);
1319                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1320                 if (s->ctx->psk_identity_hint != NULL)
1321                         OPENSSL_free(s->ctx->psk_identity_hint);
1322                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1323                 if (s->ctx->psk_identity_hint == NULL)
1324                         {
1325                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1326                         goto f_err;
1327                         }
1328
1329                 p+=i;
1330                 n-=param_len;
1331                 }
1332         else
1333 #endif /* !OPENSSL_NO_PSK */
1334 #ifndef OPENSSL_NO_SRP
1335         if (alg_k & SSL_kSRP)
1336                 {
1337                 n2s(p,i);
1338                 param_len=i+2;
1339                 if (param_len > n)
1340                         {
1341                         al=SSL_AD_DECODE_ERROR;
1342                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1343                         goto f_err;
1344                         }
1345                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1346                         {
1347                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1348                         goto err;
1349                         }
1350                 p+=i;
1351
1352                 n2s(p,i);
1353                 param_len+=i+2;
1354                 if (param_len > n)
1355                         {
1356                         al=SSL_AD_DECODE_ERROR;
1357                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1358                         goto f_err;
1359                         }
1360                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1361                         {
1362                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1363                         goto err;
1364                         }
1365                 p+=i;
1366
1367                 i = (unsigned int)(p[0]);
1368                 p++;
1369                 param_len+=i+1;
1370                 if (param_len > n)
1371                         {
1372                         al=SSL_AD_DECODE_ERROR;
1373                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1374                         goto f_err;
1375                         }
1376                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1377                         {
1378                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1379                         goto err;
1380                         }
1381                 p+=i;
1382
1383                 n2s(p,i);
1384                 param_len+=i+2;
1385                 if (param_len > n)
1386                         {
1387                         al=SSL_AD_DECODE_ERROR;
1388                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1389                         goto f_err;
1390                         }
1391                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1392                         {
1393                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1394                         goto err;
1395                         }
1396                 p+=i;
1397                 n-=param_len;
1398
1399 /* We must check if there is a certificate */
1400 #ifndef OPENSSL_NO_RSA
1401                 if (alg_a & SSL_aRSA)
1402                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1403 #else
1404                 if (0)
1405                         ;
1406 #endif
1407 #ifndef OPENSSL_NO_DSA
1408                 else if (alg_a & SSL_aDSS)
1409                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1410 #endif
1411                 }
1412         else
1413 #endif /* !OPENSSL_NO_SRP */
1414 #ifndef OPENSSL_NO_RSA
1415         if (alg_k & SSL_kRSA)
1416                 {
1417                 if ((rsa=RSA_new()) == NULL)
1418                         {
1419                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1420                         goto err;
1421                         }
1422                 n2s(p,i);
1423                 param_len=i+2;
1424                 if (param_len > n)
1425                         {
1426                         al=SSL_AD_DECODE_ERROR;
1427                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1428                         goto f_err;
1429                         }
1430                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1431                         {
1432                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1433                         goto err;
1434                         }
1435                 p+=i;
1436
1437                 n2s(p,i);
1438                 param_len+=i+2;
1439                 if (param_len > n)
1440                         {
1441                         al=SSL_AD_DECODE_ERROR;
1442                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1443                         goto f_err;
1444                         }
1445                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1446                         {
1447                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1448                         goto err;
1449                         }
1450                 p+=i;
1451                 n-=param_len;
1452
1453                 /* this should be because we are using an export cipher */
1454                 if (alg_a & SSL_aRSA)
1455                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1456                 else
1457                         {
1458                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1459                         goto err;
1460                         }
1461                 s->session->sess_cert->peer_rsa_tmp=rsa;
1462                 rsa=NULL;
1463                 }
1464 #else /* OPENSSL_NO_RSA */
1465         if (0)
1466                 ;
1467 #endif
1468 #ifndef OPENSSL_NO_DH
1469         else if (alg_k & SSL_kEDH)
1470                 {
1471                 if ((dh=DH_new()) == NULL)
1472                         {
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1474                         goto err;
1475                         }
1476                 n2s(p,i);
1477                 param_len=i+2;
1478                 if (param_len > n)
1479                         {
1480                         al=SSL_AD_DECODE_ERROR;
1481                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1482                         goto f_err;
1483                         }
1484                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1485                         {
1486                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1487                         goto err;
1488                         }
1489                 p+=i;
1490
1491                 n2s(p,i);
1492                 param_len+=i+2;
1493                 if (param_len > n)
1494                         {
1495                         al=SSL_AD_DECODE_ERROR;
1496                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1497                         goto f_err;
1498                         }
1499                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1500                         {
1501                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1502                         goto err;
1503                         }
1504                 p+=i;
1505
1506                 n2s(p,i);
1507                 param_len+=i+2;
1508                 if (param_len > n)
1509                         {
1510                         al=SSL_AD_DECODE_ERROR;
1511                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1512                         goto f_err;
1513                         }
1514                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1515                         {
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1517                         goto err;
1518                         }
1519                 p+=i;
1520                 n-=param_len;
1521
1522 #ifndef OPENSSL_NO_RSA
1523                 if (alg_a & SSL_aRSA)
1524                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1525 #else
1526                 if (0)
1527                         ;
1528 #endif
1529 #ifndef OPENSSL_NO_DSA
1530                 else if (alg_a & SSL_aDSS)
1531                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1532 #endif
1533                 /* else anonymous DH, so no certificate or pkey. */
1534
1535                 s->session->sess_cert->peer_dh_tmp=dh;
1536                 dh=NULL;
1537                 }
1538         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1539                 {
1540                 al=SSL_AD_ILLEGAL_PARAMETER;
1541                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1542                 goto f_err;
1543                 }
1544 #endif /* !OPENSSL_NO_DH */
1545
1546 #ifndef OPENSSL_NO_ECDH
1547         else if (alg_k & SSL_kEECDH)
1548                 {
1549                 EC_GROUP *ngroup;
1550                 const EC_GROUP *group;
1551
1552                 if ((ecdh=EC_KEY_new()) == NULL)
1553                         {
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1555                         goto err;
1556                         }
1557
1558                 /* Extract elliptic curve parameters and the
1559                  * server's ephemeral ECDH public key.
1560                  * Keep accumulating lengths of various components in
1561                  * param_len and make sure it never exceeds n.
1562                  */
1563
1564                 /* XXX: For now we only support named (not generic) curves
1565                  * and the ECParameters in this case is just three bytes.
1566                  */
1567                 param_len=3;
1568                 if ((param_len > n) ||
1569                     (*p != NAMED_CURVE_TYPE) ||
1570                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1571                         {
1572                         al=SSL_AD_INTERNAL_ERROR;
1573                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1574                         goto f_err;
1575                         }
1576
1577                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1578                 if (ngroup == NULL)
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1581                         goto err;
1582                         }
1583                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1584                         {
1585                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1586                         goto err;
1587                         }
1588                 EC_GROUP_free(ngroup);
1589
1590                 group = EC_KEY_get0_group(ecdh);
1591
1592                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1593                     (EC_GROUP_get_degree(group) > 163))
1594                         {
1595                         al=SSL_AD_EXPORT_RESTRICTION;
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1597                         goto f_err;
1598                         }
1599
1600                 p+=3;
1601
1602                 /* Next, get the encoded ECPoint */
1603                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1604                     ((bn_ctx = BN_CTX_new()) == NULL))
1605                         {
1606                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1607                         goto err;
1608                         }
1609
1610                 encoded_pt_len = *p;  /* length of encoded point */
1611                 p+=1;
1612                 param_len += (1 + encoded_pt_len);
1613                 if ((param_len > n) ||
1614                     (EC_POINT_oct2point(group, srvr_ecpoint,
1615                         p, encoded_pt_len, bn_ctx) == 0))
1616                         {
1617                         al=SSL_AD_DECODE_ERROR;
1618                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1619                         goto f_err;
1620                         }
1621
1622                 n-=param_len;
1623                 p+=encoded_pt_len;
1624
1625                 /* The ECC/TLS specification does not mention
1626                  * the use of DSA to sign ECParameters in the server
1627                  * key exchange message. We do support RSA and ECDSA.
1628                  */
1629                 if (0) ;
1630 #ifndef OPENSSL_NO_RSA
1631                 else if (alg_a & SSL_aRSA)
1632                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1633 #endif
1634 #ifndef OPENSSL_NO_ECDSA
1635                 else if (alg_a & SSL_aECDSA)
1636                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1637 #endif
1638                 /* else anonymous ECDH, so no certificate or pkey. */
1639                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1640                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1641                 ecdh=NULL;
1642                 BN_CTX_free(bn_ctx);
1643                 bn_ctx = NULL;
1644                 EC_POINT_free(srvr_ecpoint);
1645                 srvr_ecpoint = NULL;
1646                 }
1647         else if (alg_k)
1648                 {
1649                 al=SSL_AD_UNEXPECTED_MESSAGE;
1650                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1651                 goto f_err;
1652                 }
1653 #endif /* !OPENSSL_NO_ECDH */
1654
1655
1656         /* p points to the next byte, there are 'n' bytes left */
1657
1658         /* if it was signed, check the signature */
1659         if (pkey != NULL)
1660                 {
1661                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1662                         {
1663                         int sigalg = tls12_get_sigid(pkey);
1664                         /* Should never happen */
1665                         if (sigalg == -1)
1666                                 {
1667                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1668                                 goto err;
1669                                 }
1670                         /* Check key type is consistent with signature */
1671                         if (sigalg != (int)p[1])
1672                                 {
1673                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1674                                 al=SSL_AD_DECODE_ERROR;
1675                                 goto f_err;
1676                                 }
1677                         md = tls12_get_hash(p[0]);
1678                         if (md == NULL)
1679                                 {
1680                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1681                                 al=SSL_AD_DECODE_ERROR;
1682                                 goto f_err;
1683                                 }
1684 #ifdef SSL_DEBUG
1685 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1686 #endif
1687                         p += 2;
1688                         n -= 2;
1689                         }
1690                 else
1691                         md = EVP_sha1();
1692
1693                 n2s(p,i);
1694                 n-=2;
1695                 j=EVP_PKEY_size(pkey);
1696
1697                 if ((i != n) || (n > j) || (n <= 0))
1698                         {
1699                         /* wrong packet length */
1700                         al=SSL_AD_DECODE_ERROR;
1701                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1702                         goto f_err;
1703                         }
1704
1705 #ifndef OPENSSL_NO_RSA
1706                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1707                         {
1708                         int num;
1709
1710                         j=0;
1711                         q=md_buf;
1712                         for (num=2; num > 0; num--)
1713                                 {
1714                                 EVP_MD_CTX_set_flags(&md_ctx,
1715                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1716                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1717                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1718                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1719                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1720                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1721                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1722                                 q+=i;
1723                                 j+=i;
1724                                 }
1725                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1726                                                                 pkey->pkey.rsa);
1727                         if (i < 0)
1728                                 {
1729                                 al=SSL_AD_DECRYPT_ERROR;
1730                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1731                                 goto f_err;
1732                                 }
1733                         if (i == 0)
1734                                 {
1735                                 /* bad signature */
1736                                 al=SSL_AD_DECRYPT_ERROR;
1737                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1738                                 goto f_err;
1739                                 }
1740                         }
1741                 else
1742 #endif
1743                         {
1744                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1745                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1746                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1747                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1748                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1749                                 {
1750                                 /* bad signature */
1751                                 al=SSL_AD_DECRYPT_ERROR;
1752                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1753                                 goto f_err;
1754                                 }
1755                         }
1756                 }
1757         else
1758                 {
1759                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1760                         /* aNULL or kPSK do not need public keys */
1761                         {
1762                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1763                         goto err;
1764                         }
1765                 /* still data left over */
1766                 if (n != 0)
1767                         {
1768                         al=SSL_AD_DECODE_ERROR;
1769                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1770                         goto f_err;
1771                         }
1772                 }
1773         EVP_PKEY_free(pkey);
1774         EVP_MD_CTX_cleanup(&md_ctx);
1775         return(1);
1776 f_err:
1777         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1778 err:
1779         EVP_PKEY_free(pkey);
1780 #ifndef OPENSSL_NO_RSA
1781         if (rsa != NULL)
1782                 RSA_free(rsa);
1783 #endif
1784 #ifndef OPENSSL_NO_DH
1785         if (dh != NULL)
1786                 DH_free(dh);
1787 #endif
1788 #ifndef OPENSSL_NO_ECDH
1789         BN_CTX_free(bn_ctx);
1790         EC_POINT_free(srvr_ecpoint);
1791         if (ecdh != NULL)
1792                 EC_KEY_free(ecdh);
1793 #endif
1794         EVP_MD_CTX_cleanup(&md_ctx);
1795         return(-1);
1796         }
1797
1798 int ssl3_get_certificate_request(SSL *s)
1799         {
1800         int ok,ret=0;
1801         unsigned long n,nc,l;
1802         unsigned int llen, ctype_num,i;
1803         X509_NAME *xn=NULL;
1804         const unsigned char *p,*q;
1805         unsigned char *d;
1806         STACK_OF(X509_NAME) *ca_sk=NULL;
1807
1808         n=s->method->ssl_get_message(s,
1809                 SSL3_ST_CR_CERT_REQ_A,
1810                 SSL3_ST_CR_CERT_REQ_B,
1811                 -1,
1812                 s->max_cert_list,
1813                 &ok);
1814
1815         if (!ok) return((int)n);
1816
1817         s->s3->tmp.cert_req=0;
1818
1819         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1820                 {
1821                 s->s3->tmp.reuse_message=1;
1822                 /* If we get here we don't need any cached handshake records
1823                  * as we wont be doing client auth.
1824                  */
1825                 if (s->s3->handshake_buffer)
1826                         {
1827                         if (!ssl3_digest_cached_records(s))
1828                                 goto err;
1829                         }
1830                 return(1);
1831                 }
1832
1833         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1834                 {
1835                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1836                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1837                 goto err;
1838                 }
1839
1840         /* TLS does not like anon-DH with client cert */
1841         if (s->version > SSL3_VERSION)
1842                 {
1843                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1844                         {
1845                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1846                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1847                         goto err;
1848                         }
1849                 }
1850
1851         p=d=(unsigned char *)s->init_msg;
1852
1853         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1854                 {
1855                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1856                 goto err;
1857                 }
1858
1859         /* get the certificate types */
1860         ctype_num= *(p++);
1861         if (ctype_num > SSL3_CT_NUMBER)
1862                 ctype_num=SSL3_CT_NUMBER;
1863         for (i=0; i<ctype_num; i++)
1864                 s->s3->tmp.ctype[i]= p[i];
1865         p+=ctype_num;
1866         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1867                 {
1868                 n2s(p, llen);
1869                 /* Check we have enough room for signature algorithms and
1870                  * following length value.
1871                  */
1872                 if ((unsigned long)(p - d + llen + 2) > n)
1873                         {
1874                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1875                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1876                         goto err;
1877                         }
1878                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1879                         {
1880                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1881                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1882                         goto err;
1883                         }
1884                 p += llen;
1885                 }
1886
1887         /* get the CA RDNs */
1888         n2s(p,llen);
1889 #if 0
1890 {
1891 FILE *out;
1892 out=fopen("/tmp/vsign.der","w");
1893 fwrite(p,1,llen,out);
1894 fclose(out);
1895 }
1896 #endif
1897
1898         if ((unsigned long)(p - d + llen) != n)
1899                 {
1900                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1901                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1902                 goto err;
1903                 }
1904
1905         for (nc=0; nc<llen; )
1906                 {
1907                 n2s(p,l);
1908                 if ((l+nc+2) > llen)
1909                         {
1910                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1911                                 goto cont; /* netscape bugs */
1912                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1913                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1914                         goto err;
1915                         }
1916
1917                 q=p;
1918
1919                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1920                         {
1921                         /* If netscape tolerance is on, ignore errors */
1922                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1923                                 goto cont;
1924                         else
1925                                 {
1926                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1927                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1928                                 goto err;
1929                                 }
1930                         }
1931
1932                 if (q != (p+l))
1933                         {
1934                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1935                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1936                         goto err;
1937                         }
1938                 if (!sk_X509_NAME_push(ca_sk,xn))
1939                         {
1940                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1941                         goto err;
1942                         }
1943
1944                 p+=l;
1945                 nc+=l+2;
1946                 }
1947
1948         if (0)
1949                 {
1950 cont:
1951                 ERR_clear_error();
1952                 }
1953
1954         /* we should setup a certificate to return.... */
1955         s->s3->tmp.cert_req=1;
1956         s->s3->tmp.ctype_num=ctype_num;
1957         if (s->s3->tmp.ca_names != NULL)
1958                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1959         s->s3->tmp.ca_names=ca_sk;
1960         ca_sk=NULL;
1961
1962         ret=1;
1963 err:
1964         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1965         return(ret);
1966         }
1967
1968 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1969         {
1970         return(X509_NAME_cmp(*a,*b));
1971         }
1972 #ifndef OPENSSL_NO_TLSEXT
1973 int ssl3_get_new_session_ticket(SSL *s)
1974         {
1975         int ok,al,ret=0, ticklen;
1976         long n;
1977         const unsigned char *p;
1978         unsigned char *d;
1979
1980         n=s->method->ssl_get_message(s,
1981                 SSL3_ST_CR_SESSION_TICKET_A,
1982                 SSL3_ST_CR_SESSION_TICKET_B,
1983                 -1,
1984                 16384,
1985                 &ok);
1986
1987         if (!ok)
1988                 return((int)n);
1989
1990         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1991                 {
1992                 s->s3->tmp.reuse_message=1;
1993                 return(1);
1994                 }
1995         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1996                 {
1997                 al=SSL_AD_UNEXPECTED_MESSAGE;
1998                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1999                 goto f_err;
2000                 }
2001         if (n < 6)
2002                 {
2003                 /* need at least ticket_lifetime_hint + ticket length */
2004                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2005                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2006                 goto f_err;
2007                 }
2008
2009         p=d=(unsigned char *)s->init_msg;
2010         n2l(p, s->session->tlsext_tick_lifetime_hint);
2011         n2s(p, ticklen);
2012         /* ticket_lifetime_hint + ticket_length + ticket */
2013         if (ticklen + 6 != n)
2014                 {
2015                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2016                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2017                 goto f_err;
2018                 }
2019         if (s->session->tlsext_tick)
2020                 {
2021                 OPENSSL_free(s->session->tlsext_tick);
2022                 s->session->tlsext_ticklen = 0;
2023                 }
2024         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2025         if (!s->session->tlsext_tick)
2026                 {
2027                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2028                 goto err;
2029                 }
2030         memcpy(s->session->tlsext_tick, p, ticklen);
2031         s->session->tlsext_ticklen = ticklen;
2032         /* There are two ways to detect a resumed ticket sesion.
2033          * One is to set an appropriate session ID and then the server
2034          * must return a match in ServerHello. This allows the normal
2035          * client session ID matching to work and we know much
2036          * earlier that the ticket has been accepted.
2037          *
2038          * The other way is to set zero length session ID when the
2039          * ticket is presented and rely on the handshake to determine
2040          * session resumption.
2041          *
2042          * We choose the former approach because this fits in with
2043          * assumptions elsewhere in OpenSSL. The session ID is set
2044          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2045          * ticket.
2046          */
2047         EVP_Digest(p, ticklen,
2048                         s->session->session_id, &s->session->session_id_length,
2049 #ifndef OPENSSL_NO_SHA256
2050                                                         EVP_sha256(), NULL);
2051 #else
2052                                                         EVP_sha1(), NULL);
2053 #endif
2054         ret=1;
2055         return(ret);
2056 f_err:
2057         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2058 err:
2059         return(-1);
2060         }
2061
2062 int ssl3_get_cert_status(SSL *s)
2063         {
2064         int ok, al;
2065         unsigned long resplen,n;
2066         const unsigned char *p;
2067
2068         n=s->method->ssl_get_message(s,
2069                 SSL3_ST_CR_CERT_STATUS_A,
2070                 SSL3_ST_CR_CERT_STATUS_B,
2071                 SSL3_MT_CERTIFICATE_STATUS,
2072                 16384,
2073                 &ok);
2074
2075         if (!ok) return((int)n);
2076         if (n < 4)
2077                 {
2078                 /* need at least status type + length */
2079                 al = SSL_AD_DECODE_ERROR;
2080                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2081                 goto f_err;
2082                 }
2083         p = (unsigned char *)s->init_msg;
2084         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2085                 {
2086                 al = SSL_AD_DECODE_ERROR;
2087                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2088                 goto f_err;
2089                 }
2090         n2l3(p, resplen);
2091         if (resplen + 4 != n)
2092                 {
2093                 al = SSL_AD_DECODE_ERROR;
2094                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2095                 goto f_err;
2096                 }
2097         if (s->tlsext_ocsp_resp)
2098                 OPENSSL_free(s->tlsext_ocsp_resp);
2099         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2100         if (!s->tlsext_ocsp_resp)
2101                 {
2102                 al = SSL_AD_INTERNAL_ERROR;
2103                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2104                 goto f_err;
2105                 }
2106         s->tlsext_ocsp_resplen = resplen;
2107         if (s->ctx->tlsext_status_cb)
2108                 {
2109                 int ret;
2110                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2111                 if (ret == 0)
2112                         {
2113                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2114                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2115                         goto f_err;
2116                         }
2117                 if (ret < 0)
2118                         {
2119                         al = SSL_AD_INTERNAL_ERROR;
2120                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2121                         goto f_err;
2122                         }
2123                 }
2124         return 1;
2125 f_err:
2126         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2127         return(-1);
2128         }
2129 #endif
2130
2131 int ssl3_get_server_done(SSL *s)
2132         {
2133         int ok,ret=0;
2134         long n;
2135
2136         n=s->method->ssl_get_message(s,
2137                 SSL3_ST_CR_SRVR_DONE_A,
2138                 SSL3_ST_CR_SRVR_DONE_B,
2139                 SSL3_MT_SERVER_DONE,
2140                 30, /* should be very small, like 0 :-) */
2141                 &ok);
2142
2143         if (!ok) return((int)n);
2144         if (n > 0)
2145                 {
2146                 /* should contain no data */
2147                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2148                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2149                 return -1;
2150                 }
2151         ret=1;
2152         return(ret);
2153         }
2154
2155
2156 int ssl3_send_client_key_exchange(SSL *s)
2157         {
2158         unsigned char *p,*d;
2159         int n;
2160         unsigned long alg_k;
2161 #ifndef OPENSSL_NO_RSA
2162         unsigned char *q;
2163         EVP_PKEY *pkey=NULL;
2164 #endif
2165 #ifndef OPENSSL_NO_KRB5
2166         KSSL_ERR kssl_err;
2167 #endif /* OPENSSL_NO_KRB5 */
2168 #ifndef OPENSSL_NO_ECDH
2169         EC_KEY *clnt_ecdh = NULL;
2170         const EC_POINT *srvr_ecpoint = NULL;
2171         EVP_PKEY *srvr_pub_pkey = NULL;
2172         unsigned char *encodedPoint = NULL;
2173         int encoded_pt_len = 0;
2174         BN_CTX * bn_ctx = NULL;
2175 #endif
2176
2177         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2178                 {
2179                 d=(unsigned char *)s->init_buf->data;
2180                 p= &(d[4]);
2181
2182                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2183
2184                 /* Fool emacs indentation */
2185                 if (0) {}
2186 #ifndef OPENSSL_NO_RSA
2187                 else if (alg_k & SSL_kRSA)
2188                         {
2189                         RSA *rsa;
2190                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2191
2192                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2193                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2194                         else
2195                                 {
2196                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2197                                 if ((pkey == NULL) ||
2198                                         (pkey->type != EVP_PKEY_RSA) ||
2199                                         (pkey->pkey.rsa == NULL))
2200                                         {
2201                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2202                                         goto err;
2203                                         }
2204                                 rsa=pkey->pkey.rsa;
2205                                 EVP_PKEY_free(pkey);
2206                                 }
2207
2208                         tmp_buf[0]=s->client_version>>8;
2209                         tmp_buf[1]=s->client_version&0xff;
2210                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2211                                         goto err;
2212
2213                         s->session->master_key_length=sizeof tmp_buf;
2214
2215                         q=p;
2216                         /* Fix buf for TLS and beyond */
2217                         if (s->version > SSL3_VERSION)
2218                                 p+=2;
2219                         n=RSA_public_encrypt(sizeof tmp_buf,
2220                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2221 #ifdef PKCS1_CHECK
2222                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2223                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2224 #endif
2225                         if (n <= 0)
2226                                 {
2227                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2228                                 goto err;
2229                                 }
2230
2231                         /* Fix buf for TLS and beyond */
2232                         if (s->version > SSL3_VERSION)
2233                                 {
2234                                 s2n(n,q);
2235                                 n+=2;
2236                                 }
2237
2238                         s->session->master_key_length=
2239                                 s->method->ssl3_enc->generate_master_secret(s,
2240                                         s->session->master_key,
2241                                         tmp_buf,sizeof tmp_buf);
2242                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2243                         }
2244 #endif
2245 #ifndef OPENSSL_NO_KRB5
2246                 else if (alg_k & SSL_kKRB5)
2247                         {
2248                         krb5_error_code krb5rc;
2249                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2250                         /*  krb5_data   krb5_ap_req;  */
2251                         krb5_data       *enc_ticket;
2252                         krb5_data       authenticator, *authp = NULL;
2253                         EVP_CIPHER_CTX  ciph_ctx;
2254                         const EVP_CIPHER *enc = NULL;
2255                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2256                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2257                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2258                                                 + EVP_MAX_IV_LENGTH];
2259                         int             padl, outl = sizeof(epms);
2260
2261                         EVP_CIPHER_CTX_init(&ciph_ctx);
2262
2263 #ifdef KSSL_DEBUG
2264                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2265                                 alg_k, SSL_kKRB5);
2266 #endif  /* KSSL_DEBUG */
2267
2268                         authp = NULL;
2269 #ifdef KRB5SENDAUTH
2270                         if (KRB5SENDAUTH)  authp = &authenticator;
2271 #endif  /* KRB5SENDAUTH */
2272
2273                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2274                                 &kssl_err);
2275                         enc = kssl_map_enc(kssl_ctx->enctype);
2276                         if (enc == NULL)
2277                             goto err;
2278 #ifdef KSSL_DEBUG
2279                         {
2280                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2281                         if (krb5rc && kssl_err.text)
2282                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2283                         }
2284 #endif  /* KSSL_DEBUG */
2285
2286                         if (krb5rc)
2287                                 {
2288                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2289                                                 SSL_AD_HANDSHAKE_FAILURE);
2290                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2291                                                 kssl_err.reason);
2292                                 goto err;
2293                                 }
2294
2295                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2296                         **  in place of RFC 2712 KerberosWrapper, as in:
2297                         **
2298                         **  Send ticket (copy to *p, set n = length)
2299                         **  n = krb5_ap_req.length;
2300                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2301                         **  if (krb5_ap_req.data)
2302                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2303                         **
2304                         **  Now using real RFC 2712 KerberosWrapper
2305                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2306                         **  Note: 2712 "opaque" types are here replaced
2307                         **  with a 2-byte length followed by the value.
2308                         **  Example:
2309                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2310                         **  Where "xx xx" = length bytes.  Shown here with
2311                         **  optional authenticator omitted.
2312                         */
2313
2314                         /*  KerberosWrapper.Ticket              */
2315                         s2n(enc_ticket->length,p);
2316                         memcpy(p, enc_ticket->data, enc_ticket->length);
2317                         p+= enc_ticket->length;
2318                         n = enc_ticket->length + 2;
2319
2320                         /*  KerberosWrapper.Authenticator       */
2321                         if (authp  &&  authp->length)
2322                                 {
2323                                 s2n(authp->length,p);
2324                                 memcpy(p, authp->data, authp->length);
2325                                 p+= authp->length;
2326                                 n+= authp->length + 2;
2327
2328                                 free(authp->data);
2329                                 authp->data = NULL;
2330                                 authp->length = 0;
2331                                 }
2332                         else
2333                                 {
2334                                 s2n(0,p);/*  null authenticator length  */
2335                                 n+=2;
2336                                 }
2337
2338                             tmp_buf[0]=s->client_version>>8;
2339                             tmp_buf[1]=s->client_version&0xff;
2340                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2341                                 goto err;
2342
2343                         /*  20010420 VRS.  Tried it this way; failed.
2344                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2345                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2346                         **                              kssl_ctx->length);
2347                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2348                         */
2349
2350                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2351                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2352                                 kssl_ctx->key,iv);
2353                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2354                                 sizeof tmp_buf);
2355                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2356                         outl += padl;
2357                         if (outl > (int)sizeof epms)
2358                                 {
2359                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2360                                 goto err;
2361                                 }
2362                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2363
2364                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2365                         s2n(outl,p);
2366                         memcpy(p, epms, outl);
2367                         p+=outl;
2368                         n+=outl + 2;
2369
2370                         s->session->master_key_length=
2371                                 s->method->ssl3_enc->generate_master_secret(s,
2372                                         s->session->master_key,
2373                                         tmp_buf, sizeof tmp_buf);
2374
2375                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2376                         OPENSSL_cleanse(epms, outl);
2377                         }
2378 #endif
2379 #ifndef OPENSSL_NO_DH
2380                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2381                         {
2382                         DH *dh_srvr,*dh_clnt;
2383
2384                         if (s->session->sess_cert == NULL)
2385                                 {
2386                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2387                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2388                                 goto err;
2389                                 }
2390
2391                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2392                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2393                         else
2394                                 {
2395                                 /* we get them from the cert */
2396                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2397                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2398                                 goto err;
2399                                 }
2400
2401                         /* generate a new random key */
2402                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2403                                 {
2404                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2405                                 goto err;
2406                                 }
2407                         if (!DH_generate_key(dh_clnt))
2408                                 {
2409                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2410                                 DH_free(dh_clnt);
2411                                 goto err;
2412                                 }
2413
2414                         /* use the 'p' output buffer for the DH key, but
2415                          * make sure to clear it out afterwards */
2416
2417                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2418
2419                         if (n <= 0)
2420                                 {
2421                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2422                                 DH_free(dh_clnt);
2423                                 goto err;
2424                                 }
2425
2426                         /* generate master key from the result */
2427                         s->session->master_key_length=
2428                                 s->method->ssl3_enc->generate_master_secret(s,
2429                                         s->session->master_key,p,n);
2430                         /* clean up */
2431                         memset(p,0,n);
2432
2433                         /* send off the data */
2434                         n=BN_num_bytes(dh_clnt->pub_key);
2435                         s2n(n,p);
2436                         BN_bn2bin(dh_clnt->pub_key,p);
2437                         n+=2;
2438
2439                         DH_free(dh_clnt);
2440
2441                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2442                         }
2443 #endif
2444
2445 #ifndef OPENSSL_NO_ECDH
2446                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2447                         {
2448                         const EC_GROUP *srvr_group = NULL;
2449                         EC_KEY *tkey;
2450                         int ecdh_clnt_cert = 0;
2451                         int field_size = 0;
2452
2453                         /* Did we send out the client's
2454                          * ECDH share for use in premaster
2455                          * computation as part of client certificate?
2456                          * If so, set ecdh_clnt_cert to 1.
2457                          */
2458                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2459                                 {
2460                                 /* XXX: For now, we do not support client
2461                                  * authentication using ECDH certificates.
2462                                  * To add such support, one needs to add
2463                                  * code that checks for appropriate
2464                                  * conditions and sets ecdh_clnt_cert to 1.
2465                                  * For example, the cert have an ECC
2466                                  * key on the same curve as the server's
2467                                  * and the key should be authorized for
2468                                  * key agreement.
2469                                  *
2470                                  * One also needs to add code in ssl3_connect
2471                                  * to skip sending the certificate verify
2472                                  * message.
2473                                  *
2474                                  * if ((s->cert->key->privatekey != NULL) &&
2475                                  *     (s->cert->key->privatekey->type ==
2476                                  *      EVP_PKEY_EC) && ...)
2477                                  * ecdh_clnt_cert = 1;
2478                                  */
2479                                 }
2480
2481                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2482                                 {
2483                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2484                                 }
2485                         else
2486                                 {
2487                                 /* Get the Server Public Key from Cert */
2488                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2489                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2490                                 if ((srvr_pub_pkey == NULL) ||
2491                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2492                                     (srvr_pub_pkey->pkey.ec == NULL))
2493                                         {
2494                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2495                                             ERR_R_INTERNAL_ERROR);
2496                                         goto err;
2497                                         }
2498
2499                                 tkey = srvr_pub_pkey->pkey.ec;
2500                                 }
2501
2502                         srvr_group   = EC_KEY_get0_group(tkey);
2503                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2504
2505                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2506                                 {
2507                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2508                                     ERR_R_INTERNAL_ERROR);
2509                                 goto err;
2510                                 }
2511
2512                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2513                                 {
2514                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2515                                 goto err;
2516                                 }
2517
2518                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2519                                 {
2520                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2521                                 goto err;
2522                                 }
2523                         if (ecdh_clnt_cert)
2524                                 {
2525                                 /* Reuse key info from our certificate
2526                                  * We only need our private key to perform
2527                                  * the ECDH computation.
2528                                  */
2529                                 const BIGNUM *priv_key;
2530                                 tkey = s->cert->key->privatekey->pkey.ec;
2531                                 priv_key = EC_KEY_get0_private_key(tkey);
2532                                 if (priv_key == NULL)
2533                                         {
2534                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2535                                         goto err;
2536                                         }
2537                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2538                                         {
2539                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2540                                         goto err;
2541                                         }
2542                                 }
2543                         else
2544                                 {
2545                                 /* Generate a new ECDH key pair */
2546                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2547                                         {
2548                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2549                                         goto err;
2550                                         }
2551                                 }
2552
2553                         /* use the 'p' output buffer for the ECDH key, but
2554                          * make sure to clear it out afterwards
2555                          */
2556
2557                         field_size = EC_GROUP_get_degree(srvr_group);
2558                         if (field_size <= 0)
2559                                 {
2560                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2561                                        ERR_R_ECDH_LIB);
2562                                 goto err;
2563                                 }
2564                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2565                         if (n <= 0)
2566                                 {
2567                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2568                                        ERR_R_ECDH_LIB);
2569                                 goto err;
2570                                 }
2571
2572                         /* generate master key from the result */
2573                         s->session->master_key_length = s->method->ssl3_enc \
2574                             -> generate_master_secret(s,
2575                                 s->session->master_key,
2576                                 p, n);
2577
2578                         memset(p, 0, n); /* clean up */
2579
2580                         if (ecdh_clnt_cert)
2581                                 {
2582                                 /* Send empty client key exch message */
2583                                 n = 0;
2584                                 }
2585                         else
2586                                 {
2587                                 /* First check the size of encoding and
2588                                  * allocate memory accordingly.
2589                                  */
2590                                 encoded_pt_len =
2591                                     EC_POINT_point2oct(srvr_group,
2592                                         EC_KEY_get0_public_key(clnt_ecdh),
2593                                         POINT_CONVERSION_UNCOMPRESSED,
2594                                         NULL, 0, NULL);
2595
2596                                 encodedPoint = (unsigned char *)
2597                                     OPENSSL_malloc(encoded_pt_len *
2598                                         sizeof(unsigned char));
2599                                 bn_ctx = BN_CTX_new();
2600                                 if ((encodedPoint == NULL) ||
2601                                     (bn_ctx == NULL))
2602                                         {
2603                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2604                                         goto err;
2605                                         }
2606
2607                                 /* Encode the public key */
2608                                 n = EC_POINT_point2oct(srvr_group,
2609                                     EC_KEY_get0_public_key(clnt_ecdh),
2610                                     POINT_CONVERSION_UNCOMPRESSED,
2611                                     encodedPoint, encoded_pt_len, bn_ctx);
2612
2613                                 *p = n; /* length of encoded point */
2614                                 /* Encoded point will be copied here */
2615                                 p += 1;
2616                                 /* copy the point */
2617                                 memcpy((unsigned char *)p, encodedPoint, n);
2618                                 /* increment n to account for length field */
2619                                 n += 1;
2620                                 }
2621
2622                         /* Free allocated memory */
2623                         BN_CTX_free(bn_ctx);
2624                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2625                         if (clnt_ecdh != NULL)
2626                                  EC_KEY_free(clnt_ecdh);
2627                         EVP_PKEY_free(srvr_pub_pkey);
2628                         }
2629 #endif /* !OPENSSL_NO_ECDH */
2630                 else if (alg_k & SSL_kGOST)
2631                         {
2632                         /* GOST key exchange message creation */
2633                         EVP_PKEY_CTX *pkey_ctx;
2634                         X509 *peer_cert;
2635                         size_t msglen;
2636                         unsigned int md_len;
2637                         int keytype;
2638                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2639                         EVP_MD_CTX *ukm_hash;
2640                         EVP_PKEY *pub_key;
2641
2642                         /* Get server sertificate PKEY and create ctx from it */
2643                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2644                         if (!peer_cert)
2645                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2646                         if (!peer_cert)         {
2647                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2648                                         goto err;
2649                                 }
2650
2651                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2652                         /* If we have send a certificate, and certificate key
2653
2654                          * parameters match those of server certificate, use
2655                          * certificate key for key exchange
2656                          */
2657
2658                          /* Otherwise, generate ephemeral key pair */
2659
2660                         EVP_PKEY_encrypt_init(pkey_ctx);
2661                           /* Generate session key */
2662                     RAND_bytes(premaster_secret,32);
2663                         /* If we have client certificate, use its secret as peer key */
2664                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2665                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2666                                         /* If there was an error - just ignore it. Ephemeral key
2667                                         * would be used
2668                                         */
2669                                         ERR_clear_error();
2670                                 }
2671                         }
2672                         /* Compute shared IV and store it in algorithm-specific
2673                          * context data */
2674                         ukm_hash = EVP_MD_CTX_create();
2675                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2676                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2677                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2678                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2679                         EVP_MD_CTX_destroy(ukm_hash);
2680                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2681                                 8,shared_ukm)<0) {
2682                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2683                                                 SSL_R_LIBRARY_BUG);
2684                                         goto err;
2685                                 }
2686                         /* Make GOST keytransport blob message */
2687                         /*Encapsulate it into sequence */
2688                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2689                         msglen=255;
2690                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2691                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2692                                         SSL_R_LIBRARY_BUG);
2693                                 goto err;
2694                         }
2695                         if (msglen >= 0x80)
2696                                 {
2697                                 *(p++)=0x81;
2698                                 *(p++)= msglen & 0xff;
2699                                 n=msglen+3;
2700                                 }
2701                         else
2702                                 {
2703                                 *(p++)= msglen & 0xff;
2704                                 n=msglen+2;
2705                                 }
2706                         memcpy(p, tmp, msglen);
2707                         /* Check if pubkey from client certificate was used */
2708                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2709                                 {
2710                                 /* Set flag "skip certificate verify" */
2711                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2712                                 }
2713                         EVP_PKEY_CTX_free(pkey_ctx);
2714                         s->session->master_key_length=
2715                                 s->method->ssl3_enc->generate_master_secret(s,
2716                                         s->session->master_key,premaster_secret,32);
2717                         EVP_PKEY_free(pub_key);
2718
2719                         }
2720 #ifndef OPENSSL_NO_SRP
2721                 else if (alg_k & SSL_kSRP)
2722                         {
2723                         if (s->srp_ctx.A != NULL)
2724                                 {
2725                                 /* send off the data */
2726                                 n=BN_num_bytes(s->srp_ctx.A);
2727                                 s2n(n,p);
2728                                 BN_bn2bin(s->srp_ctx.A,p);
2729                                 n+=2;
2730                                 }
2731                         else
2732                                 {
2733                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2734                                 goto err;
2735                                 }
2736                         if (s->session->srp_username != NULL)
2737                                 OPENSSL_free(s->session->srp_username);
2738                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2739                         if (s->session->srp_username == NULL)
2740                                 {
2741                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2742                                         ERR_R_MALLOC_FAILURE);
2743                                 goto err;
2744                                 }
2745
2746                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2747                                 {
2748                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2749                                 goto err;
2750                                 }
2751                         }
2752 #endif
2753 #ifndef OPENSSL_NO_PSK
2754                 else if (alg_k & SSL_kPSK)
2755                         {
2756                         char identity[PSK_MAX_IDENTITY_LEN];
2757                         unsigned char *t = NULL;
2758                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2759                         unsigned int pre_ms_len = 0, psk_len = 0;
2760                         int psk_err = 1;
2761
2762                         n = 0;
2763                         if (s->psk_client_callback == NULL)
2764                                 {
2765                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2766                                         SSL_R_PSK_NO_CLIENT_CB);
2767                                 goto err;
2768                                 }
2769
2770                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2771                                 identity, PSK_MAX_IDENTITY_LEN,
2772                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2773                         if (psk_len > PSK_MAX_PSK_LEN)
2774                                 {
2775                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2776                                         ERR_R_INTERNAL_ERROR);
2777                                 goto psk_err;
2778                                 }
2779                         else if (psk_len == 0)
2780                                 {
2781                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2782                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2783                                 goto psk_err;
2784                                 }
2785
2786                         /* create PSK pre_master_secret */
2787                         pre_ms_len = 2+psk_len+2+psk_len;
2788                         t = psk_or_pre_ms;
2789                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2790                         s2n(psk_len, t);
2791                         memset(t, 0, psk_len);
2792                         t+=psk_len;
2793                         s2n(psk_len, t);
2794
2795                         if (s->session->psk_identity_hint != NULL)
2796                                 OPENSSL_free(s->session->psk_identity_hint);
2797                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2798                         if (s->ctx->psk_identity_hint != NULL &&
2799                                 s->session->psk_identity_hint == NULL)
2800                                 {
2801                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2802                                         ERR_R_MALLOC_FAILURE);
2803                                 goto psk_err;
2804                                 }
2805
2806                         if (s->session->psk_identity != NULL)
2807                                 OPENSSL_free(s->session->psk_identity);
2808                         s->session->psk_identity = BUF_strdup(identity);
2809                         if (s->session->psk_identity == NULL)
2810                                 {
2811                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2812                                         ERR_R_MALLOC_FAILURE);
2813                                 goto psk_err;
2814                                 }
2815
2816                         s->session->master_key_length =
2817                                 s->method->ssl3_enc->generate_master_secret(s,
2818                                         s->session->master_key,
2819                                         psk_or_pre_ms, pre_ms_len);
2820                         n = strlen(identity);
2821                         s2n(n, p);
2822                         memcpy(p, identity, n);
2823                         n+=2;
2824                         psk_err = 0;
2825                 psk_err:
2826                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2827                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2828                         if (psk_err != 0)
2829                                 {
2830                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2831                                 goto err;
2832                                 }
2833                         }
2834 #endif
2835                 else
2836                         {
2837                         ssl3_send_alert(s, SSL3_AL_FATAL,
2838                             SSL_AD_HANDSHAKE_FAILURE);
2839                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2840                             ERR_R_INTERNAL_ERROR);
2841                         goto err;
2842                         }
2843
2844                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2845                 l2n3(n,d);
2846
2847                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2848                 /* number of bytes to write */
2849                 s->init_num=n+4;
2850                 s->init_off=0;
2851                 }
2852
2853         /* SSL3_ST_CW_KEY_EXCH_B */
2854         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2855 err:
2856 #ifndef OPENSSL_NO_ECDH
2857         BN_CTX_free(bn_ctx);
2858         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2859         if (clnt_ecdh != NULL)
2860                 EC_KEY_free(clnt_ecdh);
2861         EVP_PKEY_free(srvr_pub_pkey);
2862 #endif
2863         return(-1);
2864         }
2865
2866 int ssl3_send_client_verify(SSL *s)
2867         {
2868         unsigned char *p,*d;
2869         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2870         EVP_PKEY *pkey;
2871         EVP_PKEY_CTX *pctx=NULL;
2872         EVP_MD_CTX mctx;
2873         unsigned u=0;
2874         unsigned long n;
2875         int j;
2876
2877         EVP_MD_CTX_init(&mctx);
2878
2879         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2880                 {
2881                 d=(unsigned char *)s->init_buf->data;
2882                 p= &(d[4]);
2883                 pkey=s->cert->key->privatekey;
2884 /* Create context from key and test if sha1 is allowed as digest */
2885                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2886                 EVP_PKEY_sign_init(pctx);
2887                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2888                         {
2889                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2890                                 s->method->ssl3_enc->cert_verify_mac(s,
2891                                                 NID_sha1,
2892                                                 &(data[MD5_DIGEST_LENGTH]));
2893                         }
2894                 else
2895                         {
2896                         ERR_clear_error();
2897                         }
2898                 /* For TLS v1.2 send signature algorithm and signature
2899                  * using agreed digest and cached handshake records.
2900                  */
2901                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2902                         {
2903                         long hdatalen = 0;
2904                         void *hdata;
2905                         const EVP_MD *md = s->cert->key->digest;
2906                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2907                                                                 &hdata);
2908                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2909                                 {
2910                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2911                                                 ERR_R_INTERNAL_ERROR);
2912                                 goto err;
2913                                 }
2914                         p += 2;
2915 #ifdef SSL_DEBUG
2916                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2917                                                         EVP_MD_name(md));
2918 #endif
2919                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2920                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2921                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2922                                 {
2923                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2924                                                 ERR_R_EVP_LIB);
2925                                 goto err;
2926                                 }
2927                         s2n(u,p);
2928                         n = u + 4;
2929                         if (!ssl3_digest_cached_records(s))
2930                                 goto err;
2931                         }
2932                 else
2933 #ifndef OPENSSL_NO_RSA
2934                 if (pkey->type == EVP_PKEY_RSA)
2935                         {
2936                         s->method->ssl3_enc->cert_verify_mac(s,
2937                                 NID_md5,
2938                                 &(data[0]));
2939                         if (RSA_sign(NID_md5_sha1, data,
2940                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2941                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2942                                 {
2943                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2944                                 goto err;
2945                                 }
2946                         s2n(u,p);
2947                         n=u+2;
2948                         }
2949                 else
2950 #endif
2951 #ifndef OPENSSL_NO_DSA
2952                         if (pkey->type == EVP_PKEY_DSA)
2953                         {
2954                         if (!DSA_sign(pkey->save_type,
2955                                 &(data[MD5_DIGEST_LENGTH]),
2956                                 SHA_DIGEST_LENGTH,&(p[2]),
2957                                 (unsigned int *)&j,pkey->pkey.dsa))
2958                                 {
2959                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2960                                 goto err;
2961                                 }
2962                         s2n(j,p);
2963                         n=j+2;
2964                         }
2965                 else
2966 #endif
2967 #ifndef OPENSSL_NO_ECDSA
2968                         if (pkey->type == EVP_PKEY_EC)
2969                         {
2970                         if (!ECDSA_sign(pkey->save_type,
2971                                 &(data[MD5_DIGEST_LENGTH]),
2972                                 SHA_DIGEST_LENGTH,&(p[2]),
2973                                 (unsigned int *)&j,pkey->pkey.ec))
2974                                 {
2975                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2976                                     ERR_R_ECDSA_LIB);
2977                                 goto err;
2978                                 }
2979                         s2n(j,p);
2980                         n=j+2;
2981                         }
2982                 else
2983 #endif
2984                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2985                 {
2986                 unsigned char signbuf[64];
2987                 int i;
2988                 size_t sigsize=64;
2989                 s->method->ssl3_enc->cert_verify_mac(s,
2990                         NID_id_GostR3411_94,
2991                         data);
2992                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2993                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2994                         ERR_R_INTERNAL_ERROR);
2995                         goto err;
2996                 }
2997                 for (i=63,j=0; i>=0; j++, i--) {
2998                         p[2+j]=signbuf[i];
2999                 }
3000                 s2n(j,p);
3001                 n=j+2;
3002                 }
3003                 else
3004                 {
3005                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3006                         goto err;
3007                 }
3008                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3009                 l2n3(n,d);
3010
3011                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3012                 s->init_num=(int)n+4;
3013                 s->init_off=0;
3014                 }
3015         EVP_MD_CTX_cleanup(&mctx);
3016         EVP_PKEY_CTX_free(pctx);
3017         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3018 err:
3019         EVP_MD_CTX_cleanup(&mctx);
3020         EVP_PKEY_CTX_free(pctx);
3021         return(-1);
3022         }
3023
3024 int ssl3_send_client_certificate(SSL *s)
3025         {
3026         X509 *x509=NULL;
3027         EVP_PKEY *pkey=NULL;
3028         int i;
3029         unsigned long l;
3030
3031         if (s->state == SSL3_ST_CW_CERT_A)
3032                 {
3033                 if ((s->cert == NULL) ||
3034                         (s->cert->key->x509 == NULL) ||
3035                         (s->cert->key->privatekey == NULL))
3036                         s->state=SSL3_ST_CW_CERT_B;
3037                 else
3038                         s->state=SSL3_ST_CW_CERT_C;
3039                 }
3040
3041         /* We need to get a client cert */
3042         if (s->state == SSL3_ST_CW_CERT_B)
3043                 {
3044                 /* If we get an error, we need to
3045                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3046                  * We then get retied later */
3047                 i=0;
3048                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3049                 if (i < 0)
3050                         {
3051                         s->rwstate=SSL_X509_LOOKUP;
3052                         return(-1);
3053                         }
3054                 s->rwstate=SSL_NOTHING;
3055                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3056                         {
3057                         s->state=SSL3_ST_CW_CERT_B;
3058                         if (    !SSL_use_certificate(s,x509) ||
3059                                 !SSL_use_PrivateKey(s,pkey))
3060                                 i=0;
3061                         }
3062                 else if (i == 1)
3063                         {
3064                         i=0;
3065                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3066                         }
3067
3068                 if (x509 != NULL) X509_free(x509);
3069                 if (pkey != NULL) EVP_PKEY_free(pkey);
3070                 if (i == 0)
3071                         {
3072                         if (s->version == SSL3_VERSION)
3073                                 {
3074                                 s->s3->tmp.cert_req=0;
3075                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3076                                 return(1);
3077                                 }
3078                         else
3079                                 {
3080                                 s->s3->tmp.cert_req=2;
3081                                 }
3082                         }
3083
3084                 /* Ok, we have a cert */
3085                 s->state=SSL3_ST_CW_CERT_C;
3086                 }
3087
3088         if (s->state == SSL3_ST_CW_CERT_C)
3089                 {
3090                 s->state=SSL3_ST_CW_CERT_D;
3091                 l=ssl3_output_cert_chain(s,
3092                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3093                 s->init_num=(int)l;
3094                 s->init_off=0;
3095                 }
3096         /* SSL3_ST_CW_CERT_D */
3097         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3098         }
3099
3100 #define has_bits(i,m)   (((i)&(m)) == (m))
3101
3102 int ssl3_check_cert_and_algorithm(SSL *s)
3103         {
3104         int i,idx;
3105         long alg_k,alg_a;
3106         EVP_PKEY *pkey=NULL;
3107         SESS_CERT *sc;
3108 #ifndef OPENSSL_NO_RSA
3109         RSA *rsa;
3110 #endif
3111 #ifndef OPENSSL_NO_DH
3112         DH *dh;
3113 #endif
3114
3115         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3116         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3117
3118         /* we don't have a certificate */
3119         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3120                 return(1);
3121
3122         sc=s->session->sess_cert;
3123         if (sc == NULL)
3124                 {
3125                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3126                 goto err;
3127                 }
3128
3129 #ifndef OPENSSL_NO_RSA
3130         rsa=s->session->sess_cert->peer_rsa_tmp;
3131 #endif
3132 #ifndef OPENSSL_NO_DH
3133         dh=s->session->sess_cert->peer_dh_tmp;
3134 #endif
3135
3136         /* This is the passed certificate */
3137
3138         idx=sc->peer_cert_type;
3139 #ifndef OPENSSL_NO_ECDH
3140         if (idx == SSL_PKEY_ECC)
3141                 {
3142                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3143                                                                 s) == 0)
3144                         { /* check failed */
3145                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3146                         goto f_err;
3147                         }
3148                 else
3149                         {
3150                         return 1;
3151                         }
3152                 }
3153 #endif
3154         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3155         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3156         EVP_PKEY_free(pkey);
3157
3158
3159         /* Check that we have a certificate if we require one */
3160         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3161                 {
3162                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3163                 goto f_err;
3164                 }
3165 #ifndef OPENSSL_NO_DSA
3166         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3167                 {
3168                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3169                 goto f_err;
3170                 }
3171 #endif
3172 #ifndef OPENSSL_NO_RSA
3173         if ((alg_k & SSL_kRSA) &&
3174                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3175                 {
3176                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3177                 goto f_err;
3178                 }
3179 #endif
3180 #ifndef OPENSSL_NO_DH
3181         if ((alg_k & SSL_kEDH) &&
3182                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3183                 {
3184                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3185                 goto f_err;
3186                 }
3187         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3188                 {
3189                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3190                 goto f_err;
3191                 }
3192 #ifndef OPENSSL_NO_DSA
3193         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3194                 {
3195                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3196                 goto f_err;
3197                 }
3198 #endif
3199 #endif
3200
3201         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3202                 {
3203 #ifndef OPENSSL_NO_RSA
3204                 if (alg_k & SSL_kRSA)
3205                         {
3206                         if (rsa == NULL
3207                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3208                                 {
3209                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3210                                 goto f_err;
3211                                 }
3212                         }
3213                 else
3214 #endif
3215 #ifndef OPENSSL_NO_DH
3216                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3217                             {
3218                             if (dh == NULL
3219                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3220                                 {
3221                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3222                                 goto f_err;
3223                                 }
3224                         }
3225                 else
3226 #endif
3227                         {
3228                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3229                         goto f_err;
3230                         }
3231                 }
3232         return(1);
3233 f_err:
3234         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3235 err:
3236         return(0);
3237         }
3238
3239 /* Check to see if handshake is full or resumed. Usually this is just a
3240  * case of checking to see if a cache hit has occurred. In the case of
3241  * session tickets we have to check the next message to be sure.
3242  */
3243
3244 #ifndef OPENSSL_NO_TLSEXT
3245 int ssl3_check_finished(SSL *s)
3246         {
3247         int ok;
3248         long n;
3249         /* If we have no ticket it cannot be a resumed session. */
3250         if (!s->session->tlsext_tick)
3251                 return 1;
3252         /* this function is called when we really expect a Certificate
3253          * message, so permit appropriate message length */
3254         n=s->method->ssl_get_message(s,
3255                 SSL3_ST_CR_CERT_A,
3256                 SSL3_ST_CR_CERT_B,
3257                 -1,
3258                 s->max_cert_list,
3259                 &ok);
3260         if (!ok) return((int)n);
3261         s->s3->tmp.reuse_message = 1;
3262         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3263                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3264                 return 2;
3265
3266         return 1;
3267         }
3268 #endif
3269
3270 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3271         {
3272         int i = 0;
3273 #ifndef OPENSSL_NO_ENGINE
3274         if (s->ctx->client_cert_engine)
3275                 {
3276                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3277                                                 SSL_get_client_CA_list(s),
3278                                                 px509, ppkey, NULL, NULL, NULL);
3279                 if (i != 0)
3280                         return i;
3281                 }
3282 #endif
3283         if (s->ctx->client_cert_cb)
3284                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3285         return i;
3286         }