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