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 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 s->state=SSL3_ST_CR_CERT_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_CR_CERT_A:
 314                 case SSL3_ST_CR_CERT_B:
 315 #ifndef OPENSSL_NO_TLSEXT
 316                         ret=ssl3_check_finished(s);
 317                         if (ret <= 0) goto end;
 318                         if (ret == 2)
 319                                 {
 320                                 s->hit = 1;
 321                                 if (s->tlsext_ticket_expected)
 322                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 323                                 else
 324                                         s->state=SSL3_ST_CR_FINISHED_A;
 325                                 s->init_num=0;
 326                                 break;
 327                                 }
 328 #endif
 329                         /* Check if it is anon DH/ECDH */
 330                         /* or PSK */
 331                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 332                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 333                                 {
 334                                 ret=ssl3_get_server_certificate(s);
 335                                 if (ret <= 0) goto end;
 336 #ifndef OPENSSL_NO_TLSEXT
 337                                 if (s->tlsext_status_expected)
 338                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 339                                 else
 340                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 341                                 }
 342                         else
 343                                 {
 344                                 skip = 1;
 345                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 346                                 }
 347 #else
 348                                 }
 349                         else
 350                                 skip=1;
 351
 352                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 353 #endif
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_KEY_EXCH_A:
 358                 case SSL3_ST_CR_KEY_EXCH_B:
 359                         ret=ssl3_get_key_exchange(s);
 360                         if (ret <= 0) goto end;
 361                         s->state=SSL3_ST_CR_CERT_REQ_A;
 362                         s->init_num=0;
 363
 364                         /* at this point we check that we have the
 365                          * required stuff from the server */
 366                         if (!ssl3_check_cert_and_algorithm(s))
 367                                 {
 368                                 ret= -1;
 369                                 goto end;
 370                                 }
 371                         break;
 372
 373                 case SSL3_ST_CR_CERT_REQ_A:
 374                 case SSL3_ST_CR_CERT_REQ_B:
 375                         ret=ssl3_get_certificate_request(s);
 376                         if (ret <= 0) goto end;
 377                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 378                         s->init_num=0;
 379                         break;
 380
 381                 case SSL3_ST_CR_SRVR_DONE_A:
 382                 case SSL3_ST_CR_SRVR_DONE_B:
 383                         ret=ssl3_get_server_done(s);
 384                         if (ret <= 0) goto end;
 385 #ifndef OPENSSL_NO_SRP
 386                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 387                                 {
 388                                 if ((ret = SRP_Calc_A_param(s))<=0)
 389                                         {
 390                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 391                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 392                                         goto end;
 393                                         }
 394                                 }
 395 #endif
 396                         if (s->s3->tmp.cert_req)
 397                                 s->state=SSL3_ST_CW_CERT_A;
 398                         else
 399                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 400                         s->init_num=0;
 401
 402                         break;
 403
 404                 case SSL3_ST_CW_CERT_A:
 405                 case SSL3_ST_CW_CERT_B:
 406                 case SSL3_ST_CW_CERT_C:
 407                 case SSL3_ST_CW_CERT_D:
 408                         ret=ssl3_send_client_certificate(s);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_CW_KEY_EXCH_A:
 415                 case SSL3_ST_CW_KEY_EXCH_B:
 416                         ret=ssl3_send_client_key_exchange(s);
 417                         if (ret <= 0) goto end;
 418                         /* EAY EAY EAY need to check for DH fix cert
 419                          * sent back */
 420                         /* For TLS, cert_req is set to 2, so a cert chain
 421                          * of nothing is sent, but no verify packet is sent */
 422                         /* XXX: For now, we do not support client
 423                          * authentication in ECDH cipher suites with
 424                          * ECDH (rather than ECDSA) certificates.
 425                          * We need to skip the certificate verify
 426                          * message when client's ECDH public key is sent
 427                          * inside the client certificate.
 428                          */
 429                         if (s->s3->tmp.cert_req == 1)
 430                                 {
 431                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 432                                 }
 433                         else
 434                                 {
 435                                 s->state=SSL3_ST_CW_CHANGE_A;
 436                                 s->s3->change_cipher_spec=0;
 437                                 }
 438                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 439                                 {
 440                                 s->state=SSL3_ST_CW_CHANGE_A;
 441                                 s->s3->change_cipher_spec=0;
 442                                 }
 443
 444                         s->init_num=0;
 445                         break;
 446
 447                 case SSL3_ST_CW_CERT_VRFY_A:
 448                 case SSL3_ST_CW_CERT_VRFY_B:
 449                         ret=ssl3_send_client_verify(s);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_CHANGE_A;
 452                         s->init_num=0;
 453                         s->s3->change_cipher_spec=0;
 454                         break;
 455
 456                 case SSL3_ST_CW_CHANGE_A:
 457                 case SSL3_ST_CW_CHANGE_B:
 458                         ret=ssl3_send_change_cipher_spec(s,
 459                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 460                         if (ret <= 0) goto end;
 461
 462 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 463                         s->state=SSL3_ST_CW_FINISHED_A;
 464 #else
 465                         if (s->s3->next_proto_neg_seen)
 466                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 467                         else
 468                                 s->state=SSL3_ST_CW_FINISHED_A;
 469 #endif
 470                         s->init_num=0;
 471
 472                         s->session->cipher=s->s3->tmp.new_cipher;
 473 #ifdef OPENSSL_NO_COMP
 474                         s->session->compress_meth=0;
 475 #else
 476                         if (s->s3->tmp.new_compression == NULL)
 477                                 s->session->compress_meth=0;
 478                         else
 479                                 s->session->compress_meth=
 480                                         s->s3->tmp.new_compression->id;
 481 #endif
 482                         if (!s->method->ssl3_enc->setup_key_block(s))
 483                                 {
 484                                 ret= -1;
 485                                 goto end;
 486                                 }
 487
 488                         if (!s->method->ssl3_enc->change_cipher_state(s,
 489                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 490                                 {
 491                                 ret= -1;
 492                                 goto end;
 493                                 }
 494
 495                         break;
 496
 497 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 498                 case SSL3_ST_CW_NEXT_PROTO_A:
 499                 case SSL3_ST_CW_NEXT_PROTO_B:
 500                         ret=ssl3_send_next_proto(s);
 501                         if (ret <= 0) goto end;
 502                         s->state=SSL3_ST_CW_FINISHED_A;
 503                         break;
 504 #endif
 505
 506                 case SSL3_ST_CW_FINISHED_A:
 507                 case SSL3_ST_CW_FINISHED_B:
 508                         ret=ssl3_send_finished(s,
 509                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 510                                 s->method->ssl3_enc->client_finished_label,
 511                                 s->method->ssl3_enc->client_finished_label_len);
 512                         if (ret <= 0) goto end;
 513                         s->state=SSL3_ST_CW_FLUSH;
 514
 515                         /* clear flags */
 516                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 517                         if (s->hit)
 518                                 {
 519                                 s->s3->tmp.next_state=SSL_ST_OK;
 520                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 521                                         {
 522                                         s->state=SSL_ST_OK;
 523                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 524                                         s->s3->delay_buf_pop_ret=0;
 525                                         }
 526                                 }
 527                         else
 528                                 {
 529 #ifndef OPENSSL_NO_TLSEXT
 530                                 /* Allow NewSessionTicket if ticket expected */
 531                                 if (s->tlsext_ticket_expected)
 532                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 533                                 else
 534 #endif
 535
 536                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 537                                 }
 538                         s->init_num=0;
 539                         break;
 540
 541 #ifndef OPENSSL_NO_TLSEXT
 542                 case SSL3_ST_CR_SESSION_TICKET_A:
 543                 case SSL3_ST_CR_SESSION_TICKET_B:
 544                         ret=ssl3_get_new_session_ticket(s);
 545                         if (ret <= 0) goto end;
 546                         s->state=SSL3_ST_CR_FINISHED_A;
 547                         s->init_num=0;
 548                 break;
 549
 550                 case SSL3_ST_CR_CERT_STATUS_A:
 551                 case SSL3_ST_CR_CERT_STATUS_B:
 552                         ret=ssl3_get_cert_status(s);
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 555                         s->init_num=0;
 556                 break;
 557 #endif
 558
 559                 case SSL3_ST_CR_FINISHED_A:
 560                 case SSL3_ST_CR_FINISHED_B:
 561
 562                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 563                                 SSL3_ST_CR_FINISHED_B);
 564                         if (ret <= 0) goto end;
 565
 566                         if (s->hit)
 567                                 s->state=SSL3_ST_CW_CHANGE_A;
 568                         else
 569                                 s->state=SSL_ST_OK;
 570                         s->init_num=0;
 571                         break;
 572
 573                 case SSL3_ST_CW_FLUSH:
 574                         s->rwstate=SSL_WRITING;
 575                         if (BIO_flush(s->wbio) <= 0)
 576                                 {
 577                                 ret= -1;
 578                                 goto end;
 579                                 }
 580                         s->rwstate=SSL_NOTHING;
 581                         s->state=s->s3->tmp.next_state;
 582                         break;
 583
 584                 case SSL_ST_OK:
 585                         /* clean a few things up */
 586                         ssl3_cleanup_key_block(s);
 587
 588                         if (s->init_buf != NULL)
 589                                 {
 590                                 BUF_MEM_free(s->init_buf);
 591                                 s->init_buf=NULL;
 592                                 }
 593
 594                         /* If we are not 'joining' the last two packets,
 595                          * remove the buffering now */
 596                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 597                                 ssl_free_wbio_buffer(s);
 598                         /* else do it later in ssl3_write */
 599
 600                         s->init_num=0;
 601                         s->renegotiate=0;
 602                         s->new_session=0;
 603
 604                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 605                         if (s->hit) s->ctx->stats.sess_hit++;
 606
 607                         ret=1;
 608                         /* s->server=0; */
 609                         s->handshake_func=ssl3_connect;
 610                         s->ctx->stats.sess_connect_good++;
 611
 612                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 613
 614                         goto end;
 615                         /* break; */
 616
 617                 default:
 618                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 619                         ret= -1;
 620                         goto end;
 621                         /* break; */
 622                         }
 623
 624                 /* did we do anything */
 625                 if (!s->s3->tmp.reuse_message && !skip)
 626                         {
 627                         if (s->debug)
 628                                 {
 629                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 630                                         goto end;
 631                                 }
 632
 633                         if ((cb != NULL) && (s->state != state))
 634                                 {
 635                                 new_state=s->state;
 636                                 s->state=state;
 637                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 638                                 s->state=new_state;
 639                                 }
 640                         }
 641                 skip=0;
 642                 }
 643 end:
 644         s->in_handshake--;
 645         if (buf != NULL)
 646                 BUF_MEM_free(buf);
 647         if (cb != NULL)
 648                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 649         return(ret);
 650         }
 651
 652
 653 int ssl3_client_hello(SSL *s)
 654         {
 655         unsigned char *buf;
 656         unsigned char *p,*d;
 657         int i;
 658         unsigned long l;
 659 #ifndef OPENSSL_NO_COMP
 660         int j;
 661         SSL_COMP *comp;
 662 #endif
 663
 664         buf=(unsigned char *)s->init_buf->data;
 665         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 666                 {
 667                 SSL_SESSION *sess = s->session;
 668                 if ((sess == NULL) ||
 669                         (sess->ssl_version != s->version) ||
 670 #ifdef OPENSSL_NO_TLSEXT
 671                         !sess->session_id_length ||
 672 #else
 673                         (!sess->session_id_length && !sess->tlsext_tick) ||
 674 #endif
 675                         (sess->not_resumable))
 676                         {
 677                         if (!ssl_get_new_session(s,0))
 678                                 goto err;
 679                         }
 680                 /* else use the pre-loaded session */
 681
 682                 p=s->s3->client_random;
 683
 684                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 685                         goto err;
 686
 687                 /* Do the message type and length last */
 688                 d=p= &(buf[4]);
 689
 690                 /* version indicates the negotiated version: for example from
 691                  * an SSLv2/v3 compatible client hello). The client_version
 692                  * field is the maximum version we permit and it is also
 693                  * used in RSA encrypted premaster secrets. Some servers can
 694                  * choke if we initially report a higher version then
 695                  * renegotiate to a lower one in the premaster secret. This
 696                  * didn't happen with TLS 1.0 as most servers supported it
 697                  * but it can with TLS 1.1 or later if the server only supports
 698                  * 1.0.
 699                  *
 700                  * Possible scenario with previous logic:
 701                  *      1. Client hello indicates TLS 1.2
 702                  *      2. Server hello says TLS 1.0
 703                  *      3. RSA encrypted premaster secret uses 1.2.
 704                  *      4. Handhaked proceeds using TLS 1.0.
 705                  *      5. Server sends hello request to renegotiate.
 706                  *      6. Client hello indicates TLS v1.0 as we now
 707                  *         know that is maximum server supports.
 708                  *      7. Server chokes on RSA encrypted premaster secret
 709                  *         containing version 1.0.
 710                  *
 711                  * For interoperability it should be OK to always use the
 712                  * maximum version we support in client hello and then rely
 713                  * on the checking of version to ensure the servers isn't
 714                  * being inconsistent: for example initially negotiating with
 715                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 716                  * client_version in client hello and not resetting it to
 717                  * the negotiated version.
 718                  */
 719 #if 0
 720                 *(p++)=s->version>>8;
 721                 *(p++)=s->version&0xff;
 722                 s->client_version=s->version;
 723 #else
 724                 *(p++)=s->client_version>>8;
 725                 *(p++)=s->client_version&0xff;
 726 #endif
 727
 728                 /* Random stuff */
 729                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 730                 p+=SSL3_RANDOM_SIZE;
 731
 732                 /* Session ID */
 733                 if (s->new_session)
 734                         i=0;
 735                 else
 736                         i=s->session->session_id_length;
 737                 *(p++)=i;
 738                 if (i != 0)
 739                         {
 740                         if (i > (int)sizeof(s->session->session_id))
 741                                 {
 742                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 743                                 goto err;
 744                                 }
 745                         memcpy(p,s->session->session_id,i);
 746                         p+=i;
 747                         }
 748
 749                 /* Ciphers supported */
 750                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 751                 if (i == 0)
 752                         {
 753                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 754                         goto err;
 755                         }
 756 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 757                         /* Some servers hang if client hello > 256 bytes
 758                          * as hack workaround chop number of supported ciphers
 759                          * to keep it well below this if we use TLS v1.2
 760                          */
 761                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 762                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 763                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 764 #endif
 765                 s2n(i,p);
 766                 p+=i;
 767
 768                 /* COMPRESSION */
 769 #ifdef OPENSSL_NO_COMP
 770                 *(p++)=1;
 771 #else
 772
 773                 if ((s->options & SSL_OP_NO_COMPRESSION)
 774                                         || !s->ctx->comp_methods)
 775                         j=0;
 776                 else
 777                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 778                 *(p++)=1+j;
 779                 for (i=0; i<j; i++)
 780                         {
 781                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 782                         *(p++)=comp->id;
 783                         }
 784 #endif
 785                 *(p++)=0; /* Add the NULL method */
 786
 787 #ifndef OPENSSL_NO_TLSEXT
 788                 /* TLS extensions*/
 789                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 790                         {
 791                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 792                         goto err;
 793                         }
 794                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 795                         {
 796                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 797                         goto err;
 798                         }
 799 #endif
 800
 801                 l=(p-d);
 802                 d=buf;
 803                 *(d++)=SSL3_MT_CLIENT_HELLO;
 804                 l2n3(l,d);
 805
 806                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 807                 /* number of bytes to write */
 808                 s->init_num=p-buf;
 809                 s->init_off=0;
 810                 }
 811
 812         /* SSL3_ST_CW_CLNT_HELLO_B */
 813         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 814 err:
 815         return(-1);
 816         }
 817
 818 int ssl3_get_server_hello(SSL *s)
 819         {
 820         STACK_OF(SSL_CIPHER) *sk;
 821         const SSL_CIPHER *c;
 822         unsigned char *p,*d;
 823         int i,al,ok;
 824         unsigned int j;
 825         long n;
 826 #ifndef OPENSSL_NO_COMP
 827         SSL_COMP *comp;
 828 #endif
 829
 830         n=s->method->ssl_get_message(s,
 831                 SSL3_ST_CR_SRVR_HELLO_A,
 832                 SSL3_ST_CR_SRVR_HELLO_B,
 833                 -1,
 834                 20000, /* ?? */
 835                 &ok);
 836
 837         if (!ok) return((int)n);
 838
 839         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 840                 {
 841                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 842                         {
 843                         if ( s->d1->send_cookie == 0)
 844                                 {
 845                                 s->s3->tmp.reuse_message = 1;
 846                                 return 1;
 847                                 }
 848                         else /* already sent a cookie */
 849                                 {
 850                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 851                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 852                                 goto f_err;
 853                                 }
 854                         }
 855                 }
 856
 857         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 858                 {
 859                 al=SSL_AD_UNEXPECTED_MESSAGE;
 860                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 861                 goto f_err;
 862                 }
 863
 864         d=p=(unsigned char *)s->init_msg;
 865
 866         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 867                 {
 868                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 869                 s->version=(s->version&0xff00)|p[1];
 870                 al=SSL_AD_PROTOCOL_VERSION;
 871                 goto f_err;
 872                 }
 873         p+=2;
 874
 875         /* load the server hello data */
 876         /* load the server random */
 877         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 878         p+=SSL3_RANDOM_SIZE;
 879
 880         /* get the session-id */
 881         j= *(p++);
 882
 883         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 884                 {
 885                 al=SSL_AD_ILLEGAL_PARAMETER;
 886                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 887                 goto f_err;
 888                 }
 889
 890 #ifndef OPENSSL_NO_TLSEXT
 891         /* check if we want to resume the session based on external pre-shared secret */
 892         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 893                 {
 894                 SSL_CIPHER *pref_cipher=NULL;
 895                 s->session->master_key_length=sizeof(s->session->master_key);
 896                 if (s->tls_session_secret_cb(s, s->session->master_key,
 897                                              &s->session->master_key_length,
 898                                              NULL, &pref_cipher,
 899                                              s->tls_session_secret_cb_arg))
 900                         {
 901                         s->session->cipher = pref_cipher ?
 902                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 903                         }
 904                 }
 905 #endif /* OPENSSL_NO_TLSEXT */
 906
 907         if (j != 0 && j == s->session->session_id_length
 908             && memcmp(p,s->session->session_id,j) == 0)
 909             {
 910             if(s->sid_ctx_length != s->session->sid_ctx_length
 911                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 912                 {
 913                 /* actually a client application bug */
 914                 al=SSL_AD_ILLEGAL_PARAMETER;
 915                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 916                 goto f_err;
 917                 }
 918             s->hit=1;
 919             }
 920         else    /* a miss or crap from the other end */
 921                 {
 922                 /* If we were trying for session-id reuse, make a new
 923                  * SSL_SESSION so we don't stuff up other people */
 924                 s->hit=0;
 925                 if (s->session->session_id_length > 0)
 926                         {
 927                         if (!ssl_get_new_session(s,0))
 928                                 {
 929                                 al=SSL_AD_INTERNAL_ERROR;
 930                                 goto f_err;
 931                                 }
 932                         }
 933                 s->session->session_id_length=j;
 934                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 935                 }
 936         p+=j;
 937         c=ssl_get_cipher_by_char(s,p);
 938         if (c == NULL)
 939                 {
 940                 /* unknown cipher */
 941                 al=SSL_AD_ILLEGAL_PARAMETER;
 942                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 943                 goto f_err;
 944                 }
 945         /* TLS v1.2 only ciphersuites require v1.2 or later */
 946         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 947                 (TLS1_get_version(s) < TLS1_2_VERSION))
 948                 {
 949                 al=SSL_AD_ILLEGAL_PARAMETER;
 950                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 951                 goto f_err;
 952                 }
 953         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 954
 955         sk=ssl_get_ciphers_by_id(s);
 956         i=sk_SSL_CIPHER_find(sk,c);
 957         if (i < 0)
 958                 {
 959                 /* we did not say we would use this cipher */
 960                 al=SSL_AD_ILLEGAL_PARAMETER;
 961                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 962                 goto f_err;
 963                 }
 964
 965         /* Depending on the session caching (internal/external), the cipher
 966            and/or cipher_id values may not be set. Make sure that
 967            cipher_id is set and use it for comparison. */
 968         if (s->session->cipher)
 969                 s->session->cipher_id = s->session->cipher->id;
 970         if (s->hit && (s->session->cipher_id != c->id))
 971                 {
 972 /* Workaround is now obsolete */
 973 #if 0
 974                 if (!(s->options &
 975                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 976 #endif
 977                         {
 978                         al=SSL_AD_ILLEGAL_PARAMETER;
 979                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 980                         goto f_err;
 981                         }
 982                 }
 983         s->s3->tmp.new_cipher=c;
 984         /* Don't digest cached records if TLS v1.2: we may need them for
 985          * client authentication.
 986          */
 987         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 988                 {
 989                 al = SSL_AD_INTERNAL_ERROR;
 990                 goto f_err;
 991                 }
 992         /* lets get the compression algorithm */
 993         /* COMPRESSION */
 994 #ifdef OPENSSL_NO_COMP
 995         if (*(p++) != 0)
 996                 {
 997                 al=SSL_AD_ILLEGAL_PARAMETER;
 998                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 999                 goto f_err;
1000                 }
1001         /* If compression is disabled we'd better not try to resume a session
1002          * using compression.
1003          */
1004         if (s->session->compress_meth != 0)
1005                 {
1006                 al=SSL_AD_INTERNAL_ERROR;
1007                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1008                 goto f_err;
1009                 }
1010 #else
1011         j= *(p++);
1012         if (s->hit && j != s->session->compress_meth)
1013                 {
1014                 al=SSL_AD_ILLEGAL_PARAMETER;
1015                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1016                 goto f_err;
1017                 }
1018         if (j == 0)
1019                 comp=NULL;
1020         else if (s->options & SSL_OP_NO_COMPRESSION)
1021                 {
1022                 al=SSL_AD_ILLEGAL_PARAMETER;
1023                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1024                 goto f_err;
1025                 }
1026         else
1027                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1028
1029         if ((j != 0) && (comp == NULL))
1030                 {
1031                 al=SSL_AD_ILLEGAL_PARAMETER;
1032                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1033                 goto f_err;
1034                 }
1035         else
1036                 {
1037                 s->s3->tmp.new_compression=comp;
1038                 }
1039 #endif
1040
1041 #ifndef OPENSSL_NO_TLSEXT
1042         /* TLS extensions*/
1043         if (s->version >= SSL3_VERSION)
1044                 {
1045                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1046                         {
1047                         /* 'al' set by ssl_parse_serverhello_tlsext */
1048                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1049                         goto f_err;
1050                         }
1051                 if (ssl_check_serverhello_tlsext(s) <= 0)
1052                         {
1053                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1054                                 goto err;
1055                         }
1056                 }
1057 #endif
1058
1059         if (p != (d+n))
1060                 {
1061                 /* wrong packet length */
1062                 al=SSL_AD_DECODE_ERROR;
1063                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1064                 goto f_err;
1065                 }
1066
1067         return(1);
1068 f_err:
1069         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1070 err:
1071         return(-1);
1072         }
1073
1074 int ssl3_get_server_certificate(SSL *s)
1075         {
1076         int al,i,ok,ret= -1;
1077         unsigned long n,nc,llen,l;
1078         X509 *x=NULL;
1079         const unsigned char *q,*p;
1080         unsigned char *d;
1081         STACK_OF(X509) *sk=NULL;
1082         SESS_CERT *sc;
1083         EVP_PKEY *pkey=NULL;
1084         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1085
1086         n=s->method->ssl_get_message(s,
1087                 SSL3_ST_CR_CERT_A,
1088                 SSL3_ST_CR_CERT_B,
1089                 -1,
1090                 s->max_cert_list,
1091                 &ok);
1092
1093         if (!ok) return((int)n);
1094
1095         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1096                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1097                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1098                 {
1099                 s->s3->tmp.reuse_message=1;
1100                 return(1);
1101                 }
1102
1103         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1104                 {
1105                 al=SSL_AD_UNEXPECTED_MESSAGE;
1106                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1107                 goto f_err;
1108                 }
1109         p=d=(unsigned char *)s->init_msg;
1110
1111         if ((sk=sk_X509_new_null()) == NULL)
1112                 {
1113                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1114                 goto err;
1115                 }
1116
1117         n2l3(p,llen);
1118         if (llen+3 != n)
1119                 {
1120                 al=SSL_AD_DECODE_ERROR;
1121                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1122                 goto f_err;
1123                 }
1124         for (nc=0; nc<llen; )
1125                 {
1126                 n2l3(p,l);
1127                 if ((l+nc+3) > llen)
1128                         {
1129                         al=SSL_AD_DECODE_ERROR;
1130                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1131                         goto f_err;
1132                         }
1133
1134                 q=p;
1135                 x=d2i_X509(NULL,&q,l);
1136                 if (x == NULL)
1137                         {
1138                         al=SSL_AD_BAD_CERTIFICATE;
1139                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1140                         goto f_err;
1141                         }
1142                 if (q != (p+l))
1143                         {
1144                         al=SSL_AD_DECODE_ERROR;
1145                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1146                         goto f_err;
1147                         }
1148                 if (!sk_X509_push(sk,x))
1149                         {
1150                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1151                         goto err;
1152                         }
1153                 x=NULL;
1154                 nc+=l+3;
1155                 p=q;
1156                 }
1157
1158         i=ssl_verify_cert_chain(s,sk);
1159         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1160 #ifndef OPENSSL_NO_KRB5
1161             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1162                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1163 #endif /* OPENSSL_NO_KRB5 */
1164                 )
1165                 {
1166                 al=ssl_verify_alarm_type(s->verify_result);
1167                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1168                 goto f_err;
1169                 }
1170         ERR_clear_error(); /* but we keep s->verify_result */
1171
1172         sc=ssl_sess_cert_new();
1173         if (sc == NULL) goto err;
1174
1175         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1176         s->session->sess_cert=sc;
1177
1178         sc->cert_chain=sk;
1179         /* Inconsistency alert: cert_chain does include the peer's
1180          * certificate, which we don't include in s3_srvr.c */
1181         x=sk_X509_value(sk,0);
1182         sk=NULL;
1183         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1184
1185         pkey=X509_get_pubkey(x);
1186
1187         /* VRS: allow null cert if auth == KRB5 */
1188         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1189                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1190                     ? 0 : 1;
1191
1192 #ifdef KSSL_DEBUG
1193         printf("pkey,x = %p, %p\n", pkey,x);
1194         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1195         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1196                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1197 #endif    /* KSSL_DEBUG */
1198
1199         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1200                 {
1201                 x=NULL;
1202                 al=SSL3_AL_FATAL;
1203                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1204                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1205                 goto f_err;
1206                 }
1207
1208         i=ssl_cert_type(x,pkey);
1209         if (need_cert && i < 0)
1210                 {
1211                 x=NULL;
1212                 al=SSL3_AL_FATAL;
1213                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1214                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1215                 goto f_err;
1216                 }
1217
1218         if (need_cert)
1219                 {
1220                 sc->peer_cert_type=i;
1221                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1222                 /* Why would the following ever happen?
1223                  * We just created sc a couple of lines ago. */
1224                 if (sc->peer_pkeys[i].x509 != NULL)
1225                         X509_free(sc->peer_pkeys[i].x509);
1226                 sc->peer_pkeys[i].x509=x;
1227                 sc->peer_key= &(sc->peer_pkeys[i]);
1228
1229                 if (s->session->peer != NULL)
1230                         X509_free(s->session->peer);
1231                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1232                 s->session->peer=x;
1233                 }
1234         else
1235                 {
1236                 sc->peer_cert_type=i;
1237                 sc->peer_key= NULL;
1238
1239                 if (s->session->peer != NULL)
1240                         X509_free(s->session->peer);
1241                 s->session->peer=NULL;
1242                 }
1243         s->session->verify_result = s->verify_result;
1244
1245         x=NULL;
1246         ret=1;
1247
1248         if (0)
1249                 {
1250 f_err:
1251                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1252                 }
1253 err:
1254         EVP_PKEY_free(pkey);
1255         X509_free(x);
1256         sk_X509_pop_free(sk,X509_free);
1257         return(ret);
1258         }
1259
1260 int ssl3_get_key_exchange(SSL *s)
1261         {
1262 #ifndef OPENSSL_NO_RSA
1263         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1264 #endif
1265         EVP_MD_CTX md_ctx;
1266         unsigned char *param,*p;
1267         int al,i,j,param_len,ok;
1268         long n,alg_k,alg_a;
1269         EVP_PKEY *pkey=NULL;
1270         const EVP_MD *md = NULL;
1271 #ifndef OPENSSL_NO_RSA
1272         RSA *rsa=NULL;
1273 #endif
1274 #ifndef OPENSSL_NO_DH
1275         DH *dh=NULL;
1276 #endif
1277 #ifndef OPENSSL_NO_ECDH
1278         EC_KEY *ecdh = NULL;
1279         BN_CTX *bn_ctx = NULL;
1280         EC_POINT *srvr_ecpoint = NULL;
1281         int curve_nid = 0;
1282         int encoded_pt_len = 0;
1283 #endif
1284
1285         /* use same message size as in ssl3_get_certificate_request()
1286          * as ServerKeyExchange message may be skipped */
1287         n=s->method->ssl_get_message(s,
1288                 SSL3_ST_CR_KEY_EXCH_A,
1289                 SSL3_ST_CR_KEY_EXCH_B,
1290                 -1,
1291                 s->max_cert_list,
1292                 &ok);
1293         if (!ok) return((int)n);
1294
1295         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1296                 {
1297 #ifndef OPENSSL_NO_PSK
1298                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1299                    omitted if no identity hint is sent. Set
1300                    session->sess_cert anyway to avoid problems
1301                    later.*/
1302                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1303                         {
1304                         s->session->sess_cert=ssl_sess_cert_new();
1305                         if (s->ctx->psk_identity_hint)
1306                                 OPENSSL_free(s->ctx->psk_identity_hint);
1307                         s->ctx->psk_identity_hint = NULL;
1308                         }
1309 #endif
1310                 s->s3->tmp.reuse_message=1;
1311                 return(1);
1312                 }
1313
1314         param=p=(unsigned char *)s->init_msg;
1315         if (s->session->sess_cert != NULL)
1316                 {
1317 #ifndef OPENSSL_NO_RSA
1318                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1319                         {
1320                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1321                         s->session->sess_cert->peer_rsa_tmp=NULL;
1322                         }
1323 #endif
1324 #ifndef OPENSSL_NO_DH
1325                 if (s->session->sess_cert->peer_dh_tmp)
1326                         {
1327                         DH_free(s->session->sess_cert->peer_dh_tmp);
1328                         s->session->sess_cert->peer_dh_tmp=NULL;
1329                         }
1330 #endif
1331 #ifndef OPENSSL_NO_ECDH
1332                 if (s->session->sess_cert->peer_ecdh_tmp)
1333                         {
1334                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1335                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1336                         }
1337 #endif
1338                 }
1339         else
1340                 {
1341                 s->session->sess_cert=ssl_sess_cert_new();
1342                 }
1343
1344         param_len=0;
1345         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1346         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1347         EVP_MD_CTX_init(&md_ctx);
1348
1349 #ifndef OPENSSL_NO_PSK
1350         if (alg_k & SSL_kPSK)
1351                 {
1352                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1353
1354                 al=SSL_AD_HANDSHAKE_FAILURE;
1355                 n2s(p,i);
1356                 param_len=i+2;
1357                 /* Store PSK identity hint for later use, hint is used
1358                  * in ssl3_send_client_key_exchange.  Assume that the
1359                  * maximum length of a PSK identity hint can be as
1360                  * long as the maximum length of a PSK identity. */
1361                 if (i > PSK_MAX_IDENTITY_LEN)
1362                         {
1363                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1364                                 SSL_R_DATA_LENGTH_TOO_LONG);
1365                         goto f_err;
1366                         }
1367                 if (param_len > n)
1368                         {
1369                         al=SSL_AD_DECODE_ERROR;
1370                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1371                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1372                         goto f_err;
1373                         }
1374                 /* If received PSK identity hint contains NULL
1375                  * characters, the hint is truncated from the first
1376                  * NULL. p may not be ending with NULL, so create a
1377                  * NULL-terminated string. */
1378                 memcpy(tmp_id_hint, p, i);
1379                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1380                 if (s->ctx->psk_identity_hint != NULL)
1381                         OPENSSL_free(s->ctx->psk_identity_hint);
1382                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1383                 if (s->ctx->psk_identity_hint == NULL)
1384                         {
1385                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1386                         goto f_err;
1387                         }
1388
1389                 p+=i;
1390                 n-=param_len;
1391                 }
1392         else
1393 #endif /* !OPENSSL_NO_PSK */
1394 #ifndef OPENSSL_NO_SRP
1395         if (alg_k & SSL_kSRP)
1396                 {
1397                 n2s(p,i);
1398                 param_len=i+2;
1399                 if (param_len > n)
1400                         {
1401                         al=SSL_AD_DECODE_ERROR;
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1403                         goto f_err;
1404                         }
1405                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1406                         {
1407                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1408                         goto err;
1409                         }
1410                 p+=i;
1411
1412                 n2s(p,i);
1413                 param_len+=i+2;
1414                 if (param_len > n)
1415                         {
1416                         al=SSL_AD_DECODE_ERROR;
1417                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1418                         goto f_err;
1419                         }
1420                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1421                         {
1422                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1423                         goto err;
1424                         }
1425                 p+=i;
1426
1427                 i = (unsigned int)(p[0]);
1428                 p++;
1429                 param_len+=i+1;
1430                 if (param_len > n)
1431                         {
1432                         al=SSL_AD_DECODE_ERROR;
1433                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1434                         goto f_err;
1435                         }
1436                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1437                         {
1438                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1439                         goto err;
1440                         }
1441                 p+=i;
1442
1443                 n2s(p,i);
1444                 param_len+=i+2;
1445                 if (param_len > n)
1446                         {
1447                         al=SSL_AD_DECODE_ERROR;
1448                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1449                         goto f_err;
1450                         }
1451                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1452                         {
1453                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1454                         goto err;
1455                         }
1456                 p+=i;
1457                 n-=param_len;
1458
1459 /* We must check if there is a certificate */
1460 #ifndef OPENSSL_NO_RSA
1461                 if (alg_a & SSL_aRSA)
1462                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1463 #else
1464                 if (0)
1465                         ;
1466 #endif
1467 #ifndef OPENSSL_NO_DSA
1468                 else if (alg_a & SSL_aDSS)
1469                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1470 #endif
1471                 }
1472         else
1473 #endif /* !OPENSSL_NO_SRP */
1474 #ifndef OPENSSL_NO_RSA
1475         if (alg_k & SSL_kRSA)
1476                 {
1477                 if ((rsa=RSA_new()) == NULL)
1478                         {
1479                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1480                         goto err;
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_RSA_MODULUS_LENGTH);
1488                         goto f_err;
1489                         }
1490                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
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_RSA_E_LENGTH);
1503                         goto f_err;
1504                         }
1505                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
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                 /* this should be because we are using an export cipher */
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                         {
1518                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1519                         goto err;
1520                         }
1521                 s->session->sess_cert->peer_rsa_tmp=rsa;
1522                 rsa=NULL;
1523                 }
1524 #else /* OPENSSL_NO_RSA */
1525         if (0)
1526                 ;
1527 #endif
1528 #ifndef OPENSSL_NO_DH
1529         else if (alg_k & SSL_kEDH)
1530                 {
1531                 if ((dh=DH_new()) == NULL)
1532                         {
1533                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1534                         goto err;
1535                         }
1536                 n2s(p,i);
1537                 param_len=i+2;
1538                 if (param_len > n)
1539                         {
1540                         al=SSL_AD_DECODE_ERROR;
1541                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1542                         goto f_err;
1543                         }
1544                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1547                         goto err;
1548                         }
1549                 p+=i;
1550
1551                 n2s(p,i);
1552                 param_len+=i+2;
1553                 if (param_len > n)
1554                         {
1555                         al=SSL_AD_DECODE_ERROR;
1556                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1557                         goto f_err;
1558                         }
1559                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1560                         {
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1562                         goto err;
1563                         }
1564                 p+=i;
1565
1566                 n2s(p,i);
1567                 param_len+=i+2;
1568                 if (param_len > n)
1569                         {
1570                         al=SSL_AD_DECODE_ERROR;
1571                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1572                         goto f_err;
1573                         }
1574                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1575                         {
1576                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1577                         goto err;
1578                         }
1579                 p+=i;
1580                 n-=param_len;
1581
1582 #ifndef OPENSSL_NO_RSA
1583                 if (alg_a & SSL_aRSA)
1584                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1585 #else
1586                 if (0)
1587                         ;
1588 #endif
1589 #ifndef OPENSSL_NO_DSA
1590                 else if (alg_a & SSL_aDSS)
1591                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1592 #endif
1593                 /* else anonymous DH, so no certificate or pkey. */
1594
1595                 s->session->sess_cert->peer_dh_tmp=dh;
1596                 dh=NULL;
1597                 }
1598         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1599                 {
1600                 al=SSL_AD_ILLEGAL_PARAMETER;
1601                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1602                 goto f_err;
1603                 }
1604 #endif /* !OPENSSL_NO_DH */
1605
1606 #ifndef OPENSSL_NO_ECDH
1607         else if (alg_k & SSL_kEECDH)
1608                 {
1609                 EC_GROUP *ngroup;
1610                 const EC_GROUP *group;
1611
1612                 if ((ecdh=EC_KEY_new()) == NULL)
1613                         {
1614                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1615                         goto err;
1616                         }
1617
1618                 /* Extract elliptic curve parameters and the
1619                  * server's ephemeral ECDH public key.
1620                  * Keep accumulating lengths of various components in
1621                  * param_len and make sure it never exceeds n.
1622                  */
1623
1624                 /* XXX: For now we only support named (not generic) curves
1625                  * and the ECParameters in this case is just three bytes.
1626                  */
1627                 param_len=3;
1628                 if ((param_len > n) ||
1629                     (*p != NAMED_CURVE_TYPE) ||
1630                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1631                         {
1632                         al=SSL_AD_INTERNAL_ERROR;
1633                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1634                         goto f_err;
1635                         }
1636
1637                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1638                 if (ngroup == NULL)
1639                         {
1640                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1641                         goto err;
1642                         }
1643                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1644                         {
1645                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1646                         goto err;
1647                         }
1648                 EC_GROUP_free(ngroup);
1649
1650                 group = EC_KEY_get0_group(ecdh);
1651
1652                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1653                     (EC_GROUP_get_degree(group) > 163))
1654                         {
1655                         al=SSL_AD_EXPORT_RESTRICTION;
1656                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1657                         goto f_err;
1658                         }
1659
1660                 p+=3;
1661
1662                 /* Next, get the encoded ECPoint */
1663                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1664                     ((bn_ctx = BN_CTX_new()) == NULL))
1665                         {
1666                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1667                         goto err;
1668                         }
1669
1670                 encoded_pt_len = *p;  /* length of encoded point */
1671                 p+=1;
1672                 param_len += (1 + encoded_pt_len);
1673                 if ((param_len > n) ||
1674                     (EC_POINT_oct2point(group, srvr_ecpoint,
1675                         p, encoded_pt_len, bn_ctx) == 0))
1676                         {
1677                         al=SSL_AD_DECODE_ERROR;
1678                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1679                         goto f_err;
1680                         }
1681
1682                 n-=param_len;
1683                 p+=encoded_pt_len;
1684
1685                 /* The ECC/TLS specification does not mention
1686                  * the use of DSA to sign ECParameters in the server
1687                  * key exchange message. We do support RSA and ECDSA.
1688                  */
1689                 if (0) ;
1690 #ifndef OPENSSL_NO_RSA
1691                 else if (alg_a & SSL_aRSA)
1692                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1693 #endif
1694 #ifndef OPENSSL_NO_ECDSA
1695                 else if (alg_a & SSL_aECDSA)
1696                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1697 #endif
1698                 /* else anonymous ECDH, so no certificate or pkey. */
1699                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1700                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1701                 ecdh=NULL;
1702                 BN_CTX_free(bn_ctx);
1703                 bn_ctx = NULL;
1704                 EC_POINT_free(srvr_ecpoint);
1705                 srvr_ecpoint = NULL;
1706                 }
1707         else if (alg_k)
1708                 {
1709                 al=SSL_AD_UNEXPECTED_MESSAGE;
1710                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1711                 goto f_err;
1712                 }
1713 #endif /* !OPENSSL_NO_ECDH */
1714
1715
1716         /* p points to the next byte, there are 'n' bytes left */
1717
1718         /* if it was signed, check the signature */
1719         if (pkey != NULL)
1720                 {
1721                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1722                         {
1723                         int sigalg = tls12_get_sigid(pkey);
1724                         /* Should never happen */
1725                         if (sigalg == -1)
1726                                 {
1727                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1728                                 goto err;
1729                                 }
1730                         /* Check key type is consistent with signature */
1731                         if (sigalg != (int)p[1])
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1734                                 al=SSL_AD_DECODE_ERROR;
1735                                 goto f_err;
1736                                 }
1737                         md = tls12_get_hash(p[0]);
1738                         if (md == NULL)
1739                                 {
1740                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1741                                 al=SSL_AD_DECODE_ERROR;
1742                                 goto f_err;
1743                                 }
1744 #ifdef SSL_DEBUG
1745 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1746 #endif
1747                         p += 2;
1748                         n -= 2;
1749                         }
1750                 else
1751                         md = EVP_sha1();
1752
1753                 n2s(p,i);
1754                 n-=2;
1755                 j=EVP_PKEY_size(pkey);
1756
1757                 if ((i != n) || (n > j) || (n <= 0))
1758                         {
1759                         /* wrong packet length */
1760                         al=SSL_AD_DECODE_ERROR;
1761                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1762                         goto f_err;
1763                         }
1764
1765 #ifndef OPENSSL_NO_RSA
1766                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1767                         {
1768                         int num;
1769
1770                         j=0;
1771                         q=md_buf;
1772                         for (num=2; num > 0; num--)
1773                                 {
1774                                 EVP_MD_CTX_set_flags(&md_ctx,
1775                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1776                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1777                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1778                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1779                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1780                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1781                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1782                                 q+=i;
1783                                 j+=i;
1784                                 }
1785                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1786                                                                 pkey->pkey.rsa);
1787                         if (i < 0)
1788                                 {
1789                                 al=SSL_AD_DECRYPT_ERROR;
1790                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1791                                 goto f_err;
1792                                 }
1793                         if (i == 0)
1794                                 {
1795                                 /* bad signature */
1796                                 al=SSL_AD_DECRYPT_ERROR;
1797                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1798                                 goto f_err;
1799                                 }
1800                         }
1801                 else
1802 #endif
1803                         {
1804                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1805                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1806                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1807                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1808                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1809                                 {
1810                                 /* bad signature */
1811                                 al=SSL_AD_DECRYPT_ERROR;
1812                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1813                                 goto f_err;
1814                                 }
1815                         }
1816                 }
1817         else
1818                 {
1819                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1820                         /* aNULL or kPSK do not need public keys */
1821                         {
1822                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1823                         goto err;
1824                         }
1825                 /* still data left over */
1826                 if (n != 0)
1827                         {
1828                         al=SSL_AD_DECODE_ERROR;
1829                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1830                         goto f_err;
1831                         }
1832                 }
1833         EVP_PKEY_free(pkey);
1834         EVP_MD_CTX_cleanup(&md_ctx);
1835         return(1);
1836 f_err:
1837         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1838 err:
1839         EVP_PKEY_free(pkey);
1840 #ifndef OPENSSL_NO_RSA
1841         if (rsa != NULL)
1842                 RSA_free(rsa);
1843 #endif
1844 #ifndef OPENSSL_NO_DH
1845         if (dh != NULL)
1846                 DH_free(dh);
1847 #endif
1848 #ifndef OPENSSL_NO_ECDH
1849         BN_CTX_free(bn_ctx);
1850         EC_POINT_free(srvr_ecpoint);
1851         if (ecdh != NULL)
1852                 EC_KEY_free(ecdh);
1853 #endif
1854         EVP_MD_CTX_cleanup(&md_ctx);
1855         return(-1);
1856         }
1857
1858 int ssl3_get_certificate_request(SSL *s)
1859         {
1860         int ok,ret=0;
1861         unsigned long n,nc,l;
1862         unsigned int llen, ctype_num,i;
1863         X509_NAME *xn=NULL;
1864         const unsigned char *p,*q;
1865         unsigned char *d;
1866         STACK_OF(X509_NAME) *ca_sk=NULL;
1867
1868         n=s->method->ssl_get_message(s,
1869                 SSL3_ST_CR_CERT_REQ_A,
1870                 SSL3_ST_CR_CERT_REQ_B,
1871                 -1,
1872                 s->max_cert_list,
1873                 &ok);
1874
1875         if (!ok) return((int)n);
1876
1877         s->s3->tmp.cert_req=0;
1878
1879         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1880                 {
1881                 s->s3->tmp.reuse_message=1;
1882                 /* If we get here we don't need any cached handshake records
1883                  * as we wont be doing client auth.
1884                  */
1885                 if (s->s3->handshake_buffer)
1886                         {
1887                         if (!ssl3_digest_cached_records(s))
1888                                 goto err;
1889                         }
1890                 return(1);
1891                 }
1892
1893         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1894                 {
1895                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1896                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1897                 goto err;
1898                 }
1899
1900         /* TLS does not like anon-DH with client cert */
1901         if (s->version > SSL3_VERSION)
1902                 {
1903                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1904                         {
1905                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1906                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1907                         goto err;
1908                         }
1909                 }
1910
1911         p=d=(unsigned char *)s->init_msg;
1912
1913         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1914                 {
1915                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1916                 goto err;
1917                 }
1918
1919         /* get the certificate types */
1920         ctype_num= *(p++);
1921         if (ctype_num > SSL3_CT_NUMBER)
1922                 ctype_num=SSL3_CT_NUMBER;
1923         for (i=0; i<ctype_num; i++)
1924                 s->s3->tmp.ctype[i]= p[i];
1925         p+=ctype_num;
1926         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1927                 {
1928                 n2s(p, llen);
1929                 /* Check we have enough room for signature algorithms and
1930                  * following length value.
1931                  */
1932                 if ((unsigned long)(p - d + llen + 2) > n)
1933                         {
1934                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1935                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1936                         goto err;
1937                         }
1938                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1939                         {
1940                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1941                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1942                         goto err;
1943                         }
1944                 p += llen;
1945                 }
1946
1947         /* get the CA RDNs */
1948         n2s(p,llen);
1949 #if 0
1950 {
1951 FILE *out;
1952 out=fopen("/tmp/vsign.der","w");
1953 fwrite(p,1,llen,out);
1954 fclose(out);
1955 }
1956 #endif
1957
1958         if ((unsigned long)(p - d + llen) != n)
1959                 {
1960                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1961                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1962                 goto err;
1963                 }
1964
1965         for (nc=0; nc<llen; )
1966                 {
1967                 n2s(p,l);
1968                 if ((l+nc+2) > llen)
1969                         {
1970                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1971                                 goto cont; /* netscape bugs */
1972                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1973                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1974                         goto err;
1975                         }
1976
1977                 q=p;
1978
1979                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1980                         {
1981                         /* If netscape tolerance is on, ignore errors */
1982                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1983                                 goto cont;
1984                         else
1985                                 {
1986                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1987                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1988                                 goto err;
1989                                 }
1990                         }
1991
1992                 if (q != (p+l))
1993                         {
1994                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1995                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1996                         goto err;
1997                         }
1998                 if (!sk_X509_NAME_push(ca_sk,xn))
1999                         {
2000                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2001                         goto err;
2002                         }
2003
2004                 p+=l;
2005                 nc+=l+2;
2006                 }
2007
2008         if (0)
2009                 {
2010 cont:
2011                 ERR_clear_error();
2012                 }
2013
2014         /* we should setup a certificate to return.... */
2015         s->s3->tmp.cert_req=1;
2016         s->s3->tmp.ctype_num=ctype_num;
2017         if (s->s3->tmp.ca_names != NULL)
2018                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2019         s->s3->tmp.ca_names=ca_sk;
2020         ca_sk=NULL;
2021
2022         ret=1;
2023 err:
2024         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2025         return(ret);
2026         }
2027
2028 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2029         {
2030         return(X509_NAME_cmp(*a,*b));
2031         }
2032 #ifndef OPENSSL_NO_TLSEXT
2033 int ssl3_get_new_session_ticket(SSL *s)
2034         {
2035         int ok,al,ret=0, ticklen;
2036         long n;
2037         const unsigned char *p;
2038         unsigned char *d;
2039
2040         n=s->method->ssl_get_message(s,
2041                 SSL3_ST_CR_SESSION_TICKET_A,
2042                 SSL3_ST_CR_SESSION_TICKET_B,
2043                 -1,
2044                 16384,
2045                 &ok);
2046
2047         if (!ok)
2048                 return((int)n);
2049
2050         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2051                 {
2052                 s->s3->tmp.reuse_message=1;
2053                 return(1);
2054                 }
2055         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2056                 {
2057                 al=SSL_AD_UNEXPECTED_MESSAGE;
2058                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2059                 goto f_err;
2060                 }
2061         if (n < 6)
2062                 {
2063                 /* need at least ticket_lifetime_hint + ticket length */
2064                 al = SSL_AD_DECODE_ERROR;
2065                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2066                 goto f_err;
2067                 }
2068
2069         p=d=(unsigned char *)s->init_msg;
2070         n2l(p, s->session->tlsext_tick_lifetime_hint);
2071         n2s(p, ticklen);
2072         /* ticket_lifetime_hint + ticket_length + ticket */
2073         if (ticklen + 6 != n)
2074                 {
2075                 al = SSL_AD_DECODE_ERROR;
2076                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2077                 goto f_err;
2078                 }
2079         if (s->session->tlsext_tick)
2080                 {
2081                 OPENSSL_free(s->session->tlsext_tick);
2082                 s->session->tlsext_ticklen = 0;
2083                 }
2084         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2085         if (!s->session->tlsext_tick)
2086                 {
2087                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2088                 goto err;
2089                 }
2090         memcpy(s->session->tlsext_tick, p, ticklen);
2091         s->session->tlsext_ticklen = ticklen;
2092         /* There are two ways to detect a resumed ticket sesion.
2093          * One is to set an appropriate session ID and then the server
2094          * must return a match in ServerHello. This allows the normal
2095          * client session ID matching to work and we know much
2096          * earlier that the ticket has been accepted.
2097          *
2098          * The other way is to set zero length session ID when the
2099          * ticket is presented and rely on the handshake to determine
2100          * session resumption.
2101          *
2102          * We choose the former approach because this fits in with
2103          * assumptions elsewhere in OpenSSL. The session ID is set
2104          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2105          * ticket.
2106          */
2107         EVP_Digest(p, ticklen,
2108                         s->session->session_id, &s->session->session_id_length,
2109 #ifndef OPENSSL_NO_SHA256
2110                                                         EVP_sha256(), NULL);
2111 #else
2112                                                         EVP_sha1(), NULL);
2113 #endif
2114         ret=1;
2115         return(ret);
2116 f_err:
2117         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2118 err:
2119         return(-1);
2120         }
2121
2122 int ssl3_get_cert_status(SSL *s)
2123         {
2124         int ok, al;
2125         unsigned long resplen,n;
2126         const unsigned char *p;
2127
2128         n=s->method->ssl_get_message(s,
2129                 SSL3_ST_CR_CERT_STATUS_A,
2130                 SSL3_ST_CR_CERT_STATUS_B,
2131                 SSL3_MT_CERTIFICATE_STATUS,
2132                 16384,
2133                 &ok);
2134
2135         if (!ok) return((int)n);
2136         if (n < 4)
2137                 {
2138                 /* need at least status type + length */
2139                 al = SSL_AD_DECODE_ERROR;
2140                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2141                 goto f_err;
2142                 }
2143         p = (unsigned char *)s->init_msg;
2144         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2145                 {
2146                 al = SSL_AD_DECODE_ERROR;
2147                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2148                 goto f_err;
2149                 }
2150         n2l3(p, resplen);
2151         if (resplen + 4 != n)
2152                 {
2153                 al = SSL_AD_DECODE_ERROR;
2154                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2155                 goto f_err;
2156                 }
2157         if (s->tlsext_ocsp_resp)
2158                 OPENSSL_free(s->tlsext_ocsp_resp);
2159         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2160         if (!s->tlsext_ocsp_resp)
2161                 {
2162                 al = SSL_AD_INTERNAL_ERROR;
2163                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2164                 goto f_err;
2165                 }
2166         s->tlsext_ocsp_resplen = resplen;
2167         if (s->ctx->tlsext_status_cb)
2168                 {
2169                 int ret;
2170                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2171                 if (ret == 0)
2172                         {
2173                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2174                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2175                         goto f_err;
2176                         }
2177                 if (ret < 0)
2178                         {
2179                         al = SSL_AD_INTERNAL_ERROR;
2180                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2181                         goto f_err;
2182                         }
2183                 }
2184         return 1;
2185 f_err:
2186         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2187         return(-1);
2188         }
2189 #endif
2190
2191 int ssl3_get_server_done(SSL *s)
2192         {
2193         int ok,ret=0;
2194         long n;
2195
2196         n=s->method->ssl_get_message(s,
2197                 SSL3_ST_CR_SRVR_DONE_A,
2198                 SSL3_ST_CR_SRVR_DONE_B,
2199                 SSL3_MT_SERVER_DONE,
2200                 30, /* should be very small, like 0 :-) */
2201                 &ok);
2202
2203         if (!ok) return((int)n);
2204         if (n > 0)
2205                 {
2206                 /* should contain no data */
2207                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2208                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2209                 return -1;
2210                 }
2211         ret=1;
2212         return(ret);
2213         }
2214
2215
2216 int ssl3_send_client_key_exchange(SSL *s)
2217         {
2218         unsigned char *p,*d;
2219         int n;
2220         unsigned long alg_k;
2221 #ifndef OPENSSL_NO_RSA
2222         unsigned char *q;
2223         EVP_PKEY *pkey=NULL;
2224 #endif
2225 #ifndef OPENSSL_NO_KRB5
2226         KSSL_ERR kssl_err;
2227 #endif /* OPENSSL_NO_KRB5 */
2228 #ifndef OPENSSL_NO_ECDH
2229         EC_KEY *clnt_ecdh = NULL;
2230         const EC_POINT *srvr_ecpoint = NULL;
2231         EVP_PKEY *srvr_pub_pkey = NULL;
2232         unsigned char *encodedPoint = NULL;
2233         int encoded_pt_len = 0;
2234         BN_CTX * bn_ctx = NULL;
2235 #endif
2236
2237         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2238                 {
2239                 d=(unsigned char *)s->init_buf->data;
2240                 p= &(d[4]);
2241
2242                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2243
2244                 /* Fool emacs indentation */
2245                 if (0) {}
2246 #ifndef OPENSSL_NO_RSA
2247                 else if (alg_k & SSL_kRSA)
2248                         {
2249                         RSA *rsa;
2250                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2251
2252                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2253                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2254                         else
2255                                 {
2256                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2257                                 if ((pkey == NULL) ||
2258                                         (pkey->type != EVP_PKEY_RSA) ||
2259                                         (pkey->pkey.rsa == NULL))
2260                                         {
2261                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2262                                         goto err;
2263                                         }
2264                                 rsa=pkey->pkey.rsa;
2265                                 EVP_PKEY_free(pkey);
2266                                 }
2267
2268                         tmp_buf[0]=s->client_version>>8;
2269                         tmp_buf[1]=s->client_version&0xff;
2270                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2271                                         goto err;
2272
2273                         s->session->master_key_length=sizeof tmp_buf;
2274
2275                         q=p;
2276                         /* Fix buf for TLS and beyond */
2277                         if (s->version > SSL3_VERSION)
2278                                 p+=2;
2279                         n=RSA_public_encrypt(sizeof tmp_buf,
2280                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2281 #ifdef PKCS1_CHECK
2282                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2283                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2284 #endif
2285                         if (n <= 0)
2286                                 {
2287                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2288                                 goto err;
2289                                 }
2290
2291                         /* Fix buf for TLS and beyond */
2292                         if (s->version > SSL3_VERSION)
2293                                 {
2294                                 s2n(n,q);
2295                                 n+=2;
2296                                 }
2297
2298                         s->session->master_key_length=
2299                                 s->method->ssl3_enc->generate_master_secret(s,
2300                                         s->session->master_key,
2301                                         tmp_buf,sizeof tmp_buf);
2302                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2303                         }
2304 #endif
2305 #ifndef OPENSSL_NO_KRB5
2306                 else if (alg_k & SSL_kKRB5)
2307                         {
2308                         krb5_error_code krb5rc;
2309                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2310                         /*  krb5_data   krb5_ap_req;  */
2311                         krb5_data       *enc_ticket;
2312                         krb5_data       authenticator, *authp = NULL;
2313                         EVP_CIPHER_CTX  ciph_ctx;
2314                         const EVP_CIPHER *enc = NULL;
2315                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2316                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2317                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2318                                                 + EVP_MAX_IV_LENGTH];
2319                         int             padl, outl = sizeof(epms);
2320
2321                         EVP_CIPHER_CTX_init(&ciph_ctx);
2322
2323 #ifdef KSSL_DEBUG
2324                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2325                                 alg_k, SSL_kKRB5);
2326 #endif  /* KSSL_DEBUG */
2327
2328                         authp = NULL;
2329 #ifdef KRB5SENDAUTH
2330                         if (KRB5SENDAUTH)  authp = &authenticator;
2331 #endif  /* KRB5SENDAUTH */
2332
2333                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2334                                 &kssl_err);
2335                         enc = kssl_map_enc(kssl_ctx->enctype);
2336                         if (enc == NULL)
2337                             goto err;
2338 #ifdef KSSL_DEBUG
2339                         {
2340                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2341                         if (krb5rc && kssl_err.text)
2342                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2343                         }
2344 #endif  /* KSSL_DEBUG */
2345
2346                         if (krb5rc)
2347                                 {
2348                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2349                                                 SSL_AD_HANDSHAKE_FAILURE);
2350                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2351                                                 kssl_err.reason);
2352                                 goto err;
2353                                 }
2354
2355                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2356                         **  in place of RFC 2712 KerberosWrapper, as in:
2357                         **
2358                         **  Send ticket (copy to *p, set n = length)
2359                         **  n = krb5_ap_req.length;
2360                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2361                         **  if (krb5_ap_req.data)
2362                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2363                         **
2364                         **  Now using real RFC 2712 KerberosWrapper
2365                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2366                         **  Note: 2712 "opaque" types are here replaced
2367                         **  with a 2-byte length followed by the value.
2368                         **  Example:
2369                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2370                         **  Where "xx xx" = length bytes.  Shown here with
2371                         **  optional authenticator omitted.
2372                         */
2373
2374                         /*  KerberosWrapper.Ticket              */
2375                         s2n(enc_ticket->length,p);
2376                         memcpy(p, enc_ticket->data, enc_ticket->length);
2377                         p+= enc_ticket->length;
2378                         n = enc_ticket->length + 2;
2379
2380                         /*  KerberosWrapper.Authenticator       */
2381                         if (authp  &&  authp->length)
2382                                 {
2383                                 s2n(authp->length,p);
2384                                 memcpy(p, authp->data, authp->length);
2385                                 p+= authp->length;
2386                                 n+= authp->length + 2;
2387
2388                                 free(authp->data);
2389                                 authp->data = NULL;
2390                                 authp->length = 0;
2391                                 }
2392                         else
2393                                 {
2394                                 s2n(0,p);/*  null authenticator length  */
2395                                 n+=2;
2396                                 }
2397
2398                             tmp_buf[0]=s->client_version>>8;
2399                             tmp_buf[1]=s->client_version&0xff;
2400                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2401                                 goto err;
2402
2403                         /*  20010420 VRS.  Tried it this way; failed.
2404                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2405                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2406                         **                              kssl_ctx->length);
2407                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2408                         */
2409
2410                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2411                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2412                                 kssl_ctx->key,iv);
2413                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2414                                 sizeof tmp_buf);
2415                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2416                         outl += padl;
2417                         if (outl > (int)sizeof epms)
2418                                 {
2419                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2420                                 goto err;
2421                                 }
2422                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2423
2424                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2425                         s2n(outl,p);
2426                         memcpy(p, epms, outl);
2427                         p+=outl;
2428                         n+=outl + 2;
2429
2430                         s->session->master_key_length=
2431                                 s->method->ssl3_enc->generate_master_secret(s,
2432                                         s->session->master_key,
2433                                         tmp_buf, sizeof tmp_buf);
2434
2435                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2436                         OPENSSL_cleanse(epms, outl);
2437                         }
2438 #endif
2439 #ifndef OPENSSL_NO_DH
2440                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2441                         {
2442                         DH *dh_srvr,*dh_clnt;
2443
2444                         if (s->session->sess_cert == NULL)
2445                                 {
2446                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2447                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2448                                 goto err;
2449                                 }
2450
2451                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2452                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2453                         else
2454                                 {
2455                                 /* we get them from the cert */
2456                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2457                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2458                                 goto err;
2459                                 }
2460
2461                         /* generate a new random key */
2462                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2463                                 {
2464                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2465                                 goto err;
2466                                 }
2467                         if (!DH_generate_key(dh_clnt))
2468                                 {
2469                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2470                                 DH_free(dh_clnt);
2471                                 goto err;
2472                                 }
2473
2474                         /* use the 'p' output buffer for the DH key, but
2475                          * make sure to clear it out afterwards */
2476
2477                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2478
2479                         if (n <= 0)
2480                                 {
2481                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2482                                 DH_free(dh_clnt);
2483                                 goto err;
2484                                 }
2485
2486                         /* generate master key from the result */
2487                         s->session->master_key_length=
2488                                 s->method->ssl3_enc->generate_master_secret(s,
2489                                         s->session->master_key,p,n);
2490                         /* clean up */
2491                         memset(p,0,n);
2492
2493                         /* send off the data */
2494                         n=BN_num_bytes(dh_clnt->pub_key);
2495                         s2n(n,p);
2496                         BN_bn2bin(dh_clnt->pub_key,p);
2497                         n+=2;
2498
2499                         DH_free(dh_clnt);
2500
2501                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2502                         }
2503 #endif
2504
2505 #ifndef OPENSSL_NO_ECDH
2506                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2507                         {
2508                         const EC_GROUP *srvr_group = NULL;
2509                         EC_KEY *tkey;
2510                         int ecdh_clnt_cert = 0;
2511                         int field_size = 0;
2512
2513                         /* Did we send out the client's
2514                          * ECDH share for use in premaster
2515                          * computation as part of client certificate?
2516                          * If so, set ecdh_clnt_cert to 1.
2517                          */
2518                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2519                                 {
2520                                 /* XXX: For now, we do not support client
2521                                  * authentication using ECDH certificates.
2522                                  * To add such support, one needs to add
2523                                  * code that checks for appropriate
2524                                  * conditions and sets ecdh_clnt_cert to 1.
2525                                  * For example, the cert have an ECC
2526                                  * key on the same curve as the server's
2527                                  * and the key should be authorized for
2528                                  * key agreement.
2529                                  *
2530                                  * One also needs to add code in ssl3_connect
2531                                  * to skip sending the certificate verify
2532                                  * message.
2533                                  *
2534                                  * if ((s->cert->key->privatekey != NULL) &&
2535                                  *     (s->cert->key->privatekey->type ==
2536                                  *      EVP_PKEY_EC) && ...)
2537                                  * ecdh_clnt_cert = 1;
2538                                  */
2539                                 }
2540
2541                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2542                                 {
2543                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2544                                 }
2545                         else
2546                                 {
2547                                 /* Get the Server Public Key from Cert */
2548                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2549                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2550                                 if ((srvr_pub_pkey == NULL) ||
2551                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2552                                     (srvr_pub_pkey->pkey.ec == NULL))
2553                                         {
2554                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2555                                             ERR_R_INTERNAL_ERROR);
2556                                         goto err;
2557                                         }
2558
2559                                 tkey = srvr_pub_pkey->pkey.ec;
2560                                 }
2561
2562                         srvr_group   = EC_KEY_get0_group(tkey);
2563                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2564
2565                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2566                                 {
2567                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2568                                     ERR_R_INTERNAL_ERROR);
2569                                 goto err;
2570                                 }
2571
2572                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2573                                 {
2574                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2575                                 goto err;
2576                                 }
2577
2578                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2579                                 {
2580                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2581                                 goto err;
2582                                 }
2583                         if (ecdh_clnt_cert)
2584                                 {
2585                                 /* Reuse key info from our certificate
2586                                  * We only need our private key to perform
2587                                  * the ECDH computation.
2588                                  */
2589                                 const BIGNUM *priv_key;
2590                                 tkey = s->cert->key->privatekey->pkey.ec;
2591                                 priv_key = EC_KEY_get0_private_key(tkey);
2592                                 if (priv_key == NULL)
2593                                         {
2594                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2595                                         goto err;
2596                                         }
2597                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2598                                         {
2599                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2600                                         goto err;
2601                                         }
2602                                 }
2603                         else
2604                                 {
2605                                 /* Generate a new ECDH key pair */
2606                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2607                                         {
2608                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2609                                         goto err;
2610                                         }
2611                                 }
2612
2613                         /* use the 'p' output buffer for the ECDH key, but
2614                          * make sure to clear it out afterwards
2615                          */
2616
2617                         field_size = EC_GROUP_get_degree(srvr_group);
2618                         if (field_size <= 0)
2619                                 {
2620                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2621                                        ERR_R_ECDH_LIB);
2622                                 goto err;
2623                                 }
2624                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2625                         if (n <= 0)
2626                                 {
2627                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2628                                        ERR_R_ECDH_LIB);
2629                                 goto err;
2630                                 }
2631
2632                         /* generate master key from the result */
2633                         s->session->master_key_length = s->method->ssl3_enc \
2634                             -> generate_master_secret(s,
2635                                 s->session->master_key,
2636                                 p, n);
2637
2638                         memset(p, 0, n); /* clean up */
2639
2640                         if (ecdh_clnt_cert)
2641                                 {
2642                                 /* Send empty client key exch message */
2643                                 n = 0;
2644                                 }
2645                         else
2646                                 {
2647                                 /* First check the size of encoding and
2648                                  * allocate memory accordingly.
2649                                  */
2650                                 encoded_pt_len =
2651                                     EC_POINT_point2oct(srvr_group,
2652                                         EC_KEY_get0_public_key(clnt_ecdh),
2653                                         POINT_CONVERSION_UNCOMPRESSED,
2654                                         NULL, 0, NULL);
2655
2656                                 encodedPoint = (unsigned char *)
2657                                     OPENSSL_malloc(encoded_pt_len *
2658                                         sizeof(unsigned char));
2659                                 bn_ctx = BN_CTX_new();
2660                                 if ((encodedPoint == NULL) ||
2661                                     (bn_ctx == NULL))
2662                                         {
2663                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2664                                         goto err;
2665                                         }
2666
2667                                 /* Encode the public key */
2668                                 n = EC_POINT_point2oct(srvr_group,
2669                                     EC_KEY_get0_public_key(clnt_ecdh),
2670                                     POINT_CONVERSION_UNCOMPRESSED,
2671                                     encodedPoint, encoded_pt_len, bn_ctx);
2672
2673                                 *p = n; /* length of encoded point */
2674                                 /* Encoded point will be copied here */
2675                                 p += 1;
2676                                 /* copy the point */
2677                                 memcpy((unsigned char *)p, encodedPoint, n);
2678                                 /* increment n to account for length field */
2679                                 n += 1;
2680                                 }
2681
2682                         /* Free allocated memory */
2683                         BN_CTX_free(bn_ctx);
2684                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2685                         if (clnt_ecdh != NULL)
2686                                  EC_KEY_free(clnt_ecdh);
2687                         EVP_PKEY_free(srvr_pub_pkey);
2688                         }
2689 #endif /* !OPENSSL_NO_ECDH */
2690                 else if (alg_k & SSL_kGOST)
2691                         {
2692                         /* GOST key exchange message creation */
2693                         EVP_PKEY_CTX *pkey_ctx;
2694                         X509 *peer_cert;
2695                         size_t msglen;
2696                         unsigned int md_len;
2697                         int keytype;
2698                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2699                         EVP_MD_CTX *ukm_hash;
2700                         EVP_PKEY *pub_key;
2701
2702                         /* Get server sertificate PKEY and create ctx from it */
2703                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2704                         if (!peer_cert)
2705                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2706                         if (!peer_cert)         {
2707                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2708                                         goto err;
2709                                 }
2710
2711                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2712                         /* If we have send a certificate, and certificate key
2713
2714                          * parameters match those of server certificate, use
2715                          * certificate key for key exchange
2716                          */
2717
2718                          /* Otherwise, generate ephemeral key pair */
2719
2720                         EVP_PKEY_encrypt_init(pkey_ctx);
2721                           /* Generate session key */
2722                     RAND_bytes(premaster_secret,32);
2723                         /* If we have client certificate, use its secret as peer key */
2724                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2725                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2726                                         /* If there was an error - just ignore it. Ephemeral key
2727                                         * would be used
2728                                         */
2729                                         ERR_clear_error();
2730                                 }
2731                         }
2732                         /* Compute shared IV and store it in algorithm-specific
2733                          * context data */
2734                         ukm_hash = EVP_MD_CTX_create();
2735                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2736                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2737                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2738                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2739                         EVP_MD_CTX_destroy(ukm_hash);
2740                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2741                                 8,shared_ukm)<0) {
2742                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2743                                                 SSL_R_LIBRARY_BUG);
2744                                         goto err;
2745                                 }
2746                         /* Make GOST keytransport blob message */
2747                         /*Encapsulate it into sequence */
2748                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2749                         msglen=255;
2750                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2751                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2752                                         SSL_R_LIBRARY_BUG);
2753                                 goto err;
2754                         }
2755                         if (msglen >= 0x80)
2756                                 {
2757                                 *(p++)=0x81;
2758                                 *(p++)= msglen & 0xff;
2759                                 n=msglen+3;
2760                                 }
2761                         else
2762                                 {
2763                                 *(p++)= msglen & 0xff;
2764                                 n=msglen+2;
2765                                 }
2766                         memcpy(p, tmp, msglen);
2767                         /* Check if pubkey from client certificate was used */
2768                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2769                                 {
2770                                 /* Set flag "skip certificate verify" */
2771                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2772                                 }
2773                         EVP_PKEY_CTX_free(pkey_ctx);
2774                         s->session->master_key_length=
2775                                 s->method->ssl3_enc->generate_master_secret(s,
2776                                         s->session->master_key,premaster_secret,32);
2777                         EVP_PKEY_free(pub_key);
2778
2779                         }
2780 #ifndef OPENSSL_NO_SRP
2781                 else if (alg_k & SSL_kSRP)
2782                         {
2783                         if (s->srp_ctx.A != NULL)
2784                                 {
2785                                 /* send off the data */
2786                                 n=BN_num_bytes(s->srp_ctx.A);
2787                                 s2n(n,p);
2788                                 BN_bn2bin(s->srp_ctx.A,p);
2789                                 n+=2;
2790                                 }
2791                         else
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2794                                 goto err;
2795                                 }
2796                         if (s->session->srp_username != NULL)
2797                                 OPENSSL_free(s->session->srp_username);
2798                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2799                         if (s->session->srp_username == NULL)
2800                                 {
2801                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2802                                         ERR_R_MALLOC_FAILURE);
2803                                 goto err;
2804                                 }
2805
2806                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2807                                 {
2808                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2809                                 goto err;
2810                                 }
2811                         }
2812 #endif
2813 #ifndef OPENSSL_NO_PSK
2814                 else if (alg_k & SSL_kPSK)
2815                         {
2816                         char identity[PSK_MAX_IDENTITY_LEN];
2817                         unsigned char *t = NULL;
2818                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2819                         unsigned int pre_ms_len = 0, psk_len = 0;
2820                         int psk_err = 1;
2821
2822                         n = 0;
2823                         if (s->psk_client_callback == NULL)
2824                                 {
2825                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2826                                         SSL_R_PSK_NO_CLIENT_CB);
2827                                 goto err;
2828                                 }
2829
2830                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2831                                 identity, PSK_MAX_IDENTITY_LEN,
2832                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2833                         if (psk_len > PSK_MAX_PSK_LEN)
2834                                 {
2835                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2836                                         ERR_R_INTERNAL_ERROR);
2837                                 goto psk_err;
2838                                 }
2839                         else if (psk_len == 0)
2840                                 {
2841                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2842                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2843                                 goto psk_err;
2844                                 }
2845
2846                         /* create PSK pre_master_secret */
2847                         pre_ms_len = 2+psk_len+2+psk_len;
2848                         t = psk_or_pre_ms;
2849                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2850                         s2n(psk_len, t);
2851                         memset(t, 0, psk_len);
2852                         t+=psk_len;
2853                         s2n(psk_len, t);
2854
2855                         if (s->session->psk_identity_hint != NULL)
2856                                 OPENSSL_free(s->session->psk_identity_hint);
2857                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2858                         if (s->ctx->psk_identity_hint != NULL &&
2859                                 s->session->psk_identity_hint == NULL)
2860                                 {
2861                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2862                                         ERR_R_MALLOC_FAILURE);
2863                                 goto psk_err;
2864                                 }
2865
2866                         if (s->session->psk_identity != NULL)
2867                                 OPENSSL_free(s->session->psk_identity);
2868                         s->session->psk_identity = BUF_strdup(identity);
2869                         if (s->session->psk_identity == NULL)
2870                                 {
2871                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2872                                         ERR_R_MALLOC_FAILURE);
2873                                 goto psk_err;
2874                                 }
2875
2876                         s->session->master_key_length =
2877                                 s->method->ssl3_enc->generate_master_secret(s,
2878                                         s->session->master_key,
2879                                         psk_or_pre_ms, pre_ms_len);
2880                         n = strlen(identity);
2881                         s2n(n, p);
2882                         memcpy(p, identity, n);
2883                         n+=2;
2884                         psk_err = 0;
2885                 psk_err:
2886                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2887                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2888                         if (psk_err != 0)
2889                                 {
2890                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2891                                 goto err;
2892                                 }
2893                         }
2894 #endif
2895                 else
2896                         {
2897                         ssl3_send_alert(s, SSL3_AL_FATAL,
2898                             SSL_AD_HANDSHAKE_FAILURE);
2899                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2900                             ERR_R_INTERNAL_ERROR);
2901                         goto err;
2902                         }
2903
2904                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2905                 l2n3(n,d);
2906
2907                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2908                 /* number of bytes to write */
2909                 s->init_num=n+4;
2910                 s->init_off=0;
2911                 }
2912
2913         /* SSL3_ST_CW_KEY_EXCH_B */
2914         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2915 err:
2916 #ifndef OPENSSL_NO_ECDH
2917         BN_CTX_free(bn_ctx);
2918         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2919         if (clnt_ecdh != NULL)
2920                 EC_KEY_free(clnt_ecdh);
2921         EVP_PKEY_free(srvr_pub_pkey);
2922 #endif
2923         return(-1);
2924         }
2925
2926 int ssl3_send_client_verify(SSL *s)
2927         {
2928         unsigned char *p,*d;
2929         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2930         EVP_PKEY *pkey;
2931         EVP_PKEY_CTX *pctx=NULL;
2932         EVP_MD_CTX mctx;
2933         unsigned u=0;
2934         unsigned long n;
2935         int j;
2936
2937         EVP_MD_CTX_init(&mctx);
2938
2939         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2940                 {
2941                 d=(unsigned char *)s->init_buf->data;
2942                 p= &(d[4]);
2943                 pkey=s->cert->key->privatekey;
2944 /* Create context from key and test if sha1 is allowed as digest */
2945                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2946                 EVP_PKEY_sign_init(pctx);
2947                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2948                         {
2949                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2950                                 s->method->ssl3_enc->cert_verify_mac(s,
2951                                                 NID_sha1,
2952                                                 &(data[MD5_DIGEST_LENGTH]));
2953                         }
2954                 else
2955                         {
2956                         ERR_clear_error();
2957                         }
2958                 /* For TLS v1.2 send signature algorithm and signature
2959                  * using agreed digest and cached handshake records.
2960                  */
2961                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2962                         {
2963                         long hdatalen = 0;
2964                         void *hdata;
2965                         const EVP_MD *md = s->cert->key->digest;
2966                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2967                                                                 &hdata);
2968                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2969                                 {
2970                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2971                                                 ERR_R_INTERNAL_ERROR);
2972                                 goto err;
2973                                 }
2974                         p += 2;
2975 #ifdef SSL_DEBUG
2976                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2977                                                         EVP_MD_name(md));
2978 #endif
2979                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2980                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2981                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2982                                 {
2983                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2984                                                 ERR_R_EVP_LIB);
2985                                 goto err;
2986                                 }
2987                         s2n(u,p);
2988                         n = u + 4;
2989                         if (!ssl3_digest_cached_records(s))
2990                                 goto err;
2991                         }
2992                 else
2993 #ifndef OPENSSL_NO_RSA
2994                 if (pkey->type == EVP_PKEY_RSA)
2995                         {
2996                         s->method->ssl3_enc->cert_verify_mac(s,
2997                                 NID_md5,
2998                                 &(data[0]));
2999                         if (RSA_sign(NID_md5_sha1, data,
3000                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3001                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3002                                 {
3003                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3004                                 goto err;
3005                                 }
3006                         s2n(u,p);
3007                         n=u+2;
3008                         }
3009                 else
3010 #endif
3011 #ifndef OPENSSL_NO_DSA
3012                         if (pkey->type == EVP_PKEY_DSA)
3013                         {
3014                         if (!DSA_sign(pkey->save_type,
3015                                 &(data[MD5_DIGEST_LENGTH]),
3016                                 SHA_DIGEST_LENGTH,&(p[2]),
3017                                 (unsigned int *)&j,pkey->pkey.dsa))
3018                                 {
3019                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3020                                 goto err;
3021                                 }
3022                         s2n(j,p);
3023                         n=j+2;
3024                         }
3025                 else
3026 #endif
3027 #ifndef OPENSSL_NO_ECDSA
3028                         if (pkey->type == EVP_PKEY_EC)
3029                         {
3030                         if (!ECDSA_sign(pkey->save_type,
3031                                 &(data[MD5_DIGEST_LENGTH]),
3032                                 SHA_DIGEST_LENGTH,&(p[2]),
3033                                 (unsigned int *)&j,pkey->pkey.ec))
3034                                 {
3035                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3036                                     ERR_R_ECDSA_LIB);
3037                                 goto err;
3038                                 }
3039                         s2n(j,p);
3040                         n=j+2;
3041                         }
3042                 else
3043 #endif
3044                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3045                 {
3046                 unsigned char signbuf[64];
3047                 int i;
3048                 size_t sigsize=64;
3049                 s->method->ssl3_enc->cert_verify_mac(s,
3050                         NID_id_GostR3411_94,
3051                         data);
3052                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3053                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3054                         ERR_R_INTERNAL_ERROR);
3055                         goto err;
3056                 }
3057                 for (i=63,j=0; i>=0; j++, i--) {
3058                         p[2+j]=signbuf[i];
3059                 }
3060                 s2n(j,p);
3061                 n=j+2;
3062                 }
3063                 else
3064                 {
3065                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3066                         goto err;
3067                 }
3068                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3069                 l2n3(n,d);
3070
3071                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3072                 s->init_num=(int)n+4;
3073                 s->init_off=0;
3074                 }
3075         EVP_MD_CTX_cleanup(&mctx);
3076         EVP_PKEY_CTX_free(pctx);
3077         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3078 err:
3079         EVP_MD_CTX_cleanup(&mctx);
3080         EVP_PKEY_CTX_free(pctx);
3081         return(-1);
3082         }
3083
3084 int ssl3_send_client_certificate(SSL *s)
3085         {
3086         X509 *x509=NULL;
3087         EVP_PKEY *pkey=NULL;
3088         int i;
3089         unsigned long l;
3090
3091         if (s->state == SSL3_ST_CW_CERT_A)
3092                 {
3093                 if ((s->cert == NULL) ||
3094                         (s->cert->key->x509 == NULL) ||
3095                         (s->cert->key->privatekey == NULL))
3096                         s->state=SSL3_ST_CW_CERT_B;
3097                 else
3098                         s->state=SSL3_ST_CW_CERT_C;
3099                 }
3100
3101         /* We need to get a client cert */
3102         if (s->state == SSL3_ST_CW_CERT_B)
3103                 {
3104                 /* If we get an error, we need to
3105                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3106                  * We then get retied later */
3107                 i=0;
3108                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3109                 if (i < 0)
3110                         {
3111                         s->rwstate=SSL_X509_LOOKUP;
3112                         return(-1);
3113                         }
3114                 s->rwstate=SSL_NOTHING;
3115                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3116                         {
3117                         s->state=SSL3_ST_CW_CERT_B;
3118                         if (    !SSL_use_certificate(s,x509) ||
3119                                 !SSL_use_PrivateKey(s,pkey))
3120                                 i=0;
3121                         }
3122                 else if (i == 1)
3123                         {
3124                         i=0;
3125                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3126                         }
3127
3128                 if (x509 != NULL) X509_free(x509);
3129                 if (pkey != NULL) EVP_PKEY_free(pkey);
3130                 if (i == 0)
3131                         {
3132                         if (s->version == SSL3_VERSION)
3133                                 {
3134                                 s->s3->tmp.cert_req=0;
3135                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3136                                 return(1);
3137                                 }
3138                         else
3139                                 {
3140                                 s->s3->tmp.cert_req=2;
3141                                 }
3142                         }
3143
3144                 /* Ok, we have a cert */
3145                 s->state=SSL3_ST_CW_CERT_C;
3146                 }
3147
3148         if (s->state == SSL3_ST_CW_CERT_C)
3149                 {
3150                 s->state=SSL3_ST_CW_CERT_D;
3151                 l=ssl3_output_cert_chain(s,
3152                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3153                 s->init_num=(int)l;
3154                 s->init_off=0;
3155                 }
3156         /* SSL3_ST_CW_CERT_D */
3157         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3158         }
3159
3160 #define has_bits(i,m)   (((i)&(m)) == (m))
3161
3162 int ssl3_check_cert_and_algorithm(SSL *s)
3163         {
3164         int i,idx;
3165         long alg_k,alg_a;
3166         EVP_PKEY *pkey=NULL;
3167         SESS_CERT *sc;
3168 #ifndef OPENSSL_NO_RSA
3169         RSA *rsa;
3170 #endif
3171 #ifndef OPENSSL_NO_DH
3172         DH *dh;
3173 #endif
3174
3175         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3176         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3177
3178         /* we don't have a certificate */
3179         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3180                 return(1);
3181
3182         sc=s->session->sess_cert;
3183         if (sc == NULL)
3184                 {
3185                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3186                 goto err;
3187                 }
3188
3189 #ifndef OPENSSL_NO_RSA
3190         rsa=s->session->sess_cert->peer_rsa_tmp;
3191 #endif
3192 #ifndef OPENSSL_NO_DH
3193         dh=s->session->sess_cert->peer_dh_tmp;
3194 #endif
3195
3196         /* This is the passed certificate */
3197
3198         idx=sc->peer_cert_type;
3199 #ifndef OPENSSL_NO_ECDH
3200         if (idx == SSL_PKEY_ECC)
3201                 {
3202                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3203                                                                 s) == 0)
3204                         { /* check failed */
3205                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3206                         goto f_err;
3207                         }
3208                 else
3209                         {
3210                         return 1;
3211                         }
3212                 }
3213 #endif
3214         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3215         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3216         EVP_PKEY_free(pkey);
3217
3218
3219         /* Check that we have a certificate if we require one */
3220         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3221                 {
3222                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3223                 goto f_err;
3224                 }
3225 #ifndef OPENSSL_NO_DSA
3226         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3227                 {
3228                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3229                 goto f_err;
3230                 }
3231 #endif
3232 #ifndef OPENSSL_NO_RSA
3233         if ((alg_k & SSL_kRSA) &&
3234                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3235                 {
3236                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3237                 goto f_err;
3238                 }
3239 #endif
3240 #ifndef OPENSSL_NO_DH
3241         if ((alg_k & SSL_kEDH) &&
3242                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3243                 {
3244                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3245                 goto f_err;
3246                 }
3247         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3248                 {
3249                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3250                 goto f_err;
3251                 }
3252 #ifndef OPENSSL_NO_DSA
3253         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3254                 {
3255                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3256                 goto f_err;
3257                 }
3258 #endif
3259 #endif
3260
3261         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3262                 {
3263 #ifndef OPENSSL_NO_RSA
3264                 if (alg_k & SSL_kRSA)
3265                         {
3266                         if (rsa == NULL
3267                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3268                                 {
3269                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3270                                 goto f_err;
3271                                 }
3272                         }
3273                 else
3274 #endif
3275 #ifndef OPENSSL_NO_DH
3276                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3277                             {
3278                             if (dh == NULL
3279                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3280                                 {
3281                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3282                                 goto f_err;
3283                                 }
3284                         }
3285                 else
3286 #endif
3287                         {
3288                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3289                         goto f_err;
3290                         }
3291                 }
3292         return(1);
3293 f_err:
3294         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3295 err:
3296         return(0);
3297         }
3298
3299 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3300 int ssl3_send_next_proto(SSL *s)
3301         {
3302         unsigned int len, padding_len;
3303         unsigned char *d;
3304
3305         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3306                 {
3307                 len = s->next_proto_negotiated_len;
3308                 padding_len = 32 - ((len + 2) % 32);
3309                 d = (unsigned char *)s->init_buf->data;
3310                 d[4] = len;
3311                 memcpy(d + 5, s->next_proto_negotiated, len);
3312                 d[5 + len] = padding_len;
3313                 memset(d + 6 + len, 0, padding_len);
3314                 *(d++)=SSL3_MT_NEXT_PROTO;
3315                 l2n3(2 + len + padding_len, d);
3316                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3317                 s->init_num = 4 + 2 + len + padding_len;
3318                 s->init_off = 0;
3319                 }
3320
3321         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3322 }
3323 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3324
3325 /* Check to see if handshake is full or resumed. Usually this is just a
3326  * case of checking to see if a cache hit has occurred. In the case of
3327  * session tickets we have to check the next message to be sure.
3328  */
3329
3330 #ifndef OPENSSL_NO_TLSEXT
3331 int ssl3_check_finished(SSL *s)
3332         {
3333         int ok;
3334         long n;
3335         /* If we have no ticket it cannot be a resumed session. */
3336         if (!s->session->tlsext_tick)
3337                 return 1;
3338         /* this function is called when we really expect a Certificate
3339          * message, so permit appropriate message length */
3340         n=s->method->ssl_get_message(s,
3341                 SSL3_ST_CR_CERT_A,
3342                 SSL3_ST_CR_CERT_B,
3343                 -1,
3344                 s->max_cert_list,
3345                 &ok);
3346         if (!ok) return((int)n);
3347         s->s3->tmp.reuse_message = 1;
3348         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3349                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3350                 return 2;
3351
3352         return 1;
3353         }
3354 #endif
3355
3356 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3357         {
3358         int i = 0;
3359 #ifndef OPENSSL_NO_ENGINE
3360         if (s->ctx->client_cert_engine)
3361                 {
3362                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3363                                                 SSL_get_client_CA_list(s),
3364                                                 px509, ppkey, NULL, NULL, NULL);
3365                 if (i != 0)
3366                         return i;
3367                 }
3368 #endif
3369         if (s->ctx->client_cert_cb)
3370                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3371         return i;
3372         }