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 Time,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                 Time=(unsigned long)time(NULL);                 /* Time */
 684                 l2n(Time,p);
 685                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 686                         goto err;
 687
 688                 /* Do the message type and length last */
 689                 d=p= &(buf[4]);
 690
 691                 /* version indicates the negotiated version: for example from
 692                  * an SSLv2/v3 compatible client hello). The client_version
 693                  * field is the maximum version we permit and it is also
 694                  * used in RSA encrypted premaster secrets. Some servers can
 695                  * choke if we initially report a higher version then
 696                  * renegotiate to a lower one in the premaster secret. This
 697                  * didn't happen with TLS 1.0 as most servers supported it
 698                  * but it can with TLS 1.1 or later if the server only supports
 699                  * 1.0.
 700                  *
 701                  * Possible scenario with previous logic:
 702                  *      1. Client hello indicates TLS 1.2
 703                  *      2. Server hello says TLS 1.0
 704                  *      3. RSA encrypted premaster secret uses 1.2.
 705                  *      4. Handhaked proceeds using TLS 1.0.
 706                  *      5. Server sends hello request to renegotiate.
 707                  *      6. Client hello indicates TLS v1.0 as we now
 708                  *         know that is maximum server supports.
 709                  *      7. Server chokes on RSA encrypted premaster secret
 710                  *         containing version 1.0.
 711                  *
 712                  * For interoperability it should be OK to always use the
 713                  * maximum version we support in client hello and then rely
 714                  * on the checking of version to ensure the servers isn't
 715                  * being inconsistent: for example initially negotiating with
 716                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 717                  * client_version in client hello and not resetting it to
 718                  * the negotiated version.
 719                  */
 720 #if 0
 721                 *(p++)=s->version>>8;
 722                 *(p++)=s->version&0xff;
 723                 s->client_version=s->version;
 724 #else
 725                 *(p++)=s->client_version>>8;
 726                 *(p++)=s->client_version&0xff;
 727 #endif
 728
 729                 /* Random stuff */
 730                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 731                 p+=SSL3_RANDOM_SIZE;
 732
 733                 /* Session ID */
 734                 if (s->new_session)
 735                         i=0;
 736                 else
 737                         i=s->session->session_id_length;
 738                 *(p++)=i;
 739                 if (i != 0)
 740                         {
 741                         if (i > (int)sizeof(s->session->session_id))
 742                                 {
 743                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 744                                 goto err;
 745                                 }
 746                         memcpy(p,s->session->session_id,i);
 747                         p+=i;
 748                         }
 749
 750                 /* Ciphers supported */
 751                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 752                 if (i == 0)
 753                         {
 754                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 755                         goto err;
 756                         }
 757 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 758                         /* Some servers hang if client hello > 256 bytes
 759                          * as hack workaround chop number of supported ciphers
 760                          * to keep it well below this if we use TLS v1.2
 761                          */
 762                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 763                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 764                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 765 #endif
 766                 s2n(i,p);
 767                 p+=i;
 768
 769                 /* COMPRESSION */
 770 #ifdef OPENSSL_NO_COMP
 771                 *(p++)=1;
 772 #else
 773
 774                 if ((s->options & SSL_OP_NO_COMPRESSION)
 775                                         || !s->ctx->comp_methods)
 776                         j=0;
 777                 else
 778                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 779                 *(p++)=1+j;
 780                 for (i=0; i<j; i++)
 781                         {
 782                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 783                         *(p++)=comp->id;
 784                         }
 785 #endif
 786                 *(p++)=0; /* Add the NULL method */
 787
 788 #ifndef OPENSSL_NO_TLSEXT
 789                 /* TLS extensions*/
 790                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 791                         {
 792                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 793                         goto err;
 794                         }
 795                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 796                         {
 797                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 798                         goto err;
 799                         }
 800 #endif
 801
 802                 l=(p-d);
 803                 d=buf;
 804                 *(d++)=SSL3_MT_CLIENT_HELLO;
 805                 l2n3(l,d);
 806
 807                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 808                 /* number of bytes to write */
 809                 s->init_num=p-buf;
 810                 s->init_off=0;
 811                 }
 812
 813         /* SSL3_ST_CW_CLNT_HELLO_B */
 814         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 815 err:
 816         return(-1);
 817         }
 818
 819 int ssl3_get_server_hello(SSL *s)
 820         {
 821         STACK_OF(SSL_CIPHER) *sk;
 822         const SSL_CIPHER *c;
 823         unsigned char *p,*d;
 824         int i,al,ok;
 825         unsigned int j;
 826         long n;
 827 #ifndef OPENSSL_NO_COMP
 828         SSL_COMP *comp;
 829 #endif
 830
 831         n=s->method->ssl_get_message(s,
 832                 SSL3_ST_CR_SRVR_HELLO_A,
 833                 SSL3_ST_CR_SRVR_HELLO_B,
 834                 -1,
 835                 20000, /* ?? */
 836                 &ok);
 837
 838         if (!ok) return((int)n);
 839
 840         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 841                 {
 842                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 843                         {
 844                         if ( s->d1->send_cookie == 0)
 845                                 {
 846                                 s->s3->tmp.reuse_message = 1;
 847                                 return 1;
 848                                 }
 849                         else /* already sent a cookie */
 850                                 {
 851                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 852                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 853                                 goto f_err;
 854                                 }
 855                         }
 856                 }
 857
 858         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 859                 {
 860                 al=SSL_AD_UNEXPECTED_MESSAGE;
 861                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 862                 goto f_err;
 863                 }
 864
 865         d=p=(unsigned char *)s->init_msg;
 866
 867         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 868                 {
 869                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 870                 s->version=(s->version&0xff00)|p[1];
 871                 al=SSL_AD_PROTOCOL_VERSION;
 872                 goto f_err;
 873                 }
 874         p+=2;
 875
 876         /* load the server hello data */
 877         /* load the server random */
 878         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 879         p+=SSL3_RANDOM_SIZE;
 880
 881         /* get the session-id */
 882         j= *(p++);
 883
 884         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 885                 {
 886                 al=SSL_AD_ILLEGAL_PARAMETER;
 887                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 888                 goto f_err;
 889                 }
 890
 891 #ifndef OPENSSL_NO_TLSEXT
 892         /* check if we want to resume the session based on external pre-shared secret */
 893         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 894                 {
 895                 SSL_CIPHER *pref_cipher=NULL;
 896                 s->session->master_key_length=sizeof(s->session->master_key);
 897                 if (s->tls_session_secret_cb(s, s->session->master_key,
 898                                              &s->session->master_key_length,
 899                                              NULL, &pref_cipher,
 900                                              s->tls_session_secret_cb_arg))
 901                         {
 902                         s->session->cipher = pref_cipher ?
 903                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 904                         }
 905                 }
 906 #endif /* OPENSSL_NO_TLSEXT */
 907
 908         if (j != 0 && j == s->session->session_id_length
 909             && memcmp(p,s->session->session_id,j) == 0)
 910             {
 911             if(s->sid_ctx_length != s->session->sid_ctx_length
 912                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 913                 {
 914                 /* actually a client application bug */
 915                 al=SSL_AD_ILLEGAL_PARAMETER;
 916                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 917                 goto f_err;
 918                 }
 919             s->hit=1;
 920             }
 921         else    /* a miss or crap from the other end */
 922                 {
 923                 /* If we were trying for session-id reuse, make a new
 924                  * SSL_SESSION so we don't stuff up other people */
 925                 s->hit=0;
 926                 if (s->session->session_id_length > 0)
 927                         {
 928                         if (!ssl_get_new_session(s,0))
 929                                 {
 930                                 al=SSL_AD_INTERNAL_ERROR;
 931                                 goto f_err;
 932                                 }
 933                         }
 934                 s->session->session_id_length=j;
 935                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 936                 }
 937         p+=j;
 938         c=ssl_get_cipher_by_char(s,p);
 939         if (c == NULL)
 940                 {
 941                 /* unknown cipher */
 942                 al=SSL_AD_ILLEGAL_PARAMETER;
 943                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 944                 goto f_err;
 945                 }
 946         /* TLS v1.2 only ciphersuites require v1.2 or later */
 947         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 948                 (TLS1_get_version(s) < TLS1_2_VERSION))
 949                 {
 950                 al=SSL_AD_ILLEGAL_PARAMETER;
 951                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 952                 goto f_err;
 953                 }
 954         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 955
 956         sk=ssl_get_ciphers_by_id(s);
 957         i=sk_SSL_CIPHER_find(sk,c);
 958         if (i < 0)
 959                 {
 960                 /* we did not say we would use this cipher */
 961                 al=SSL_AD_ILLEGAL_PARAMETER;
 962                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 963                 goto f_err;
 964                 }
 965
 966         /* Depending on the session caching (internal/external), the cipher
 967            and/or cipher_id values may not be set. Make sure that
 968            cipher_id is set and use it for comparison. */
 969         if (s->session->cipher)
 970                 s->session->cipher_id = s->session->cipher->id;
 971         if (s->hit && (s->session->cipher_id != c->id))
 972                 {
 973 /* Workaround is now obsolete */
 974 #if 0
 975                 if (!(s->options &
 976                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 977 #endif
 978                         {
 979                         al=SSL_AD_ILLEGAL_PARAMETER;
 980                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 981                         goto f_err;
 982                         }
 983                 }
 984         s->s3->tmp.new_cipher=c;
 985         /* Don't digest cached records if TLS v1.2: we may need them for
 986          * client authentication.
 987          */
 988         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 989                 goto f_err;
 990         /* lets get the compression algorithm */
 991         /* COMPRESSION */
 992 #ifdef OPENSSL_NO_COMP
 993         if (*(p++) != 0)
 994                 {
 995                 al=SSL_AD_ILLEGAL_PARAMETER;
 996                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 997                 goto f_err;
 998                 }
 999         /* If compression is disabled we'd better not try to resume a session
1000          * using compression.
1001          */
1002         if (s->session->compress_meth != 0)
1003                 {
1004                 al=SSL_AD_INTERNAL_ERROR;
1005                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1006                 goto f_err;
1007                 }
1008 #else
1009         j= *(p++);
1010         if (s->hit && j != s->session->compress_meth)
1011                 {
1012                 al=SSL_AD_ILLEGAL_PARAMETER;
1013                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1014                 goto f_err;
1015                 }
1016         if (j == 0)
1017                 comp=NULL;
1018         else if (s->options & SSL_OP_NO_COMPRESSION)
1019                 {
1020                 al=SSL_AD_ILLEGAL_PARAMETER;
1021                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1022                 goto f_err;
1023                 }
1024         else
1025                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1026
1027         if ((j != 0) && (comp == NULL))
1028                 {
1029                 al=SSL_AD_ILLEGAL_PARAMETER;
1030                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1031                 goto f_err;
1032                 }
1033         else
1034                 {
1035                 s->s3->tmp.new_compression=comp;
1036                 }
1037 #endif
1038
1039 #ifndef OPENSSL_NO_TLSEXT
1040         /* TLS extensions*/
1041         if (s->version >= SSL3_VERSION)
1042                 {
1043                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1044                         {
1045                         /* 'al' set by ssl_parse_serverhello_tlsext */
1046                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1047                         goto f_err;
1048                         }
1049                 if (ssl_check_serverhello_tlsext(s) <= 0)
1050                         {
1051                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1052                                 goto err;
1053                         }
1054                 }
1055 #endif
1056
1057         if (p != (d+n))
1058                 {
1059                 /* wrong packet length */
1060                 al=SSL_AD_DECODE_ERROR;
1061                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1062                 goto f_err;
1063                 }
1064
1065         return(1);
1066 f_err:
1067         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1068 err:
1069         return(-1);
1070         }
1071
1072 int ssl3_get_server_certificate(SSL *s)
1073         {
1074         int al,i,ok,ret= -1;
1075         unsigned long n,nc,llen,l;
1076         X509 *x=NULL;
1077         const unsigned char *q,*p;
1078         unsigned char *d;
1079         STACK_OF(X509) *sk=NULL;
1080         SESS_CERT *sc;
1081         EVP_PKEY *pkey=NULL;
1082         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1083
1084         n=s->method->ssl_get_message(s,
1085                 SSL3_ST_CR_CERT_A,
1086                 SSL3_ST_CR_CERT_B,
1087                 -1,
1088                 s->max_cert_list,
1089                 &ok);
1090
1091         if (!ok) return((int)n);
1092
1093         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1094                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1095                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1096                 {
1097                 s->s3->tmp.reuse_message=1;
1098                 return(1);
1099                 }
1100
1101         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1102                 {
1103                 al=SSL_AD_UNEXPECTED_MESSAGE;
1104                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1105                 goto f_err;
1106                 }
1107         p=d=(unsigned char *)s->init_msg;
1108
1109         if ((sk=sk_X509_new_null()) == NULL)
1110                 {
1111                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1112                 goto err;
1113                 }
1114
1115         n2l3(p,llen);
1116         if (llen+3 != n)
1117                 {
1118                 al=SSL_AD_DECODE_ERROR;
1119                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1120                 goto f_err;
1121                 }
1122         for (nc=0; nc<llen; )
1123                 {
1124                 n2l3(p,l);
1125                 if ((l+nc+3) > llen)
1126                         {
1127                         al=SSL_AD_DECODE_ERROR;
1128                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1129                         goto f_err;
1130                         }
1131
1132                 q=p;
1133                 x=d2i_X509(NULL,&q,l);
1134                 if (x == NULL)
1135                         {
1136                         al=SSL_AD_BAD_CERTIFICATE;
1137                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1138                         goto f_err;
1139                         }
1140                 if (q != (p+l))
1141                         {
1142                         al=SSL_AD_DECODE_ERROR;
1143                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1144                         goto f_err;
1145                         }
1146                 if (!sk_X509_push(sk,x))
1147                         {
1148                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1149                         goto err;
1150                         }
1151                 x=NULL;
1152                 nc+=l+3;
1153                 p=q;
1154                 }
1155
1156         i=ssl_verify_cert_chain(s,sk);
1157         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1158 #ifndef OPENSSL_NO_KRB5
1159             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1160                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1161 #endif /* OPENSSL_NO_KRB5 */
1162                 )
1163                 {
1164                 al=ssl_verify_alarm_type(s->verify_result);
1165                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1166                 goto f_err;
1167                 }
1168         ERR_clear_error(); /* but we keep s->verify_result */
1169
1170         sc=ssl_sess_cert_new();
1171         if (sc == NULL) goto err;
1172
1173         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1174         s->session->sess_cert=sc;
1175
1176         sc->cert_chain=sk;
1177         /* Inconsistency alert: cert_chain does include the peer's
1178          * certificate, which we don't include in s3_srvr.c */
1179         x=sk_X509_value(sk,0);
1180         sk=NULL;
1181         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1182
1183         pkey=X509_get_pubkey(x);
1184
1185         /* VRS: allow null cert if auth == KRB5 */
1186         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1187                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1188                     ? 0 : 1;
1189
1190 #ifdef KSSL_DEBUG
1191         printf("pkey,x = %p, %p\n", pkey,x);
1192         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1193         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1194                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1195 #endif    /* KSSL_DEBUG */
1196
1197         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1198                 {
1199                 x=NULL;
1200                 al=SSL3_AL_FATAL;
1201                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1202                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1203                 goto f_err;
1204                 }
1205
1206         i=ssl_cert_type(x,pkey);
1207         if (need_cert && i < 0)
1208                 {
1209                 x=NULL;
1210                 al=SSL3_AL_FATAL;
1211                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1212                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1213                 goto f_err;
1214                 }
1215
1216         if (need_cert)
1217                 {
1218                 sc->peer_cert_type=i;
1219                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1220                 /* Why would the following ever happen?
1221                  * We just created sc a couple of lines ago. */
1222                 if (sc->peer_pkeys[i].x509 != NULL)
1223                         X509_free(sc->peer_pkeys[i].x509);
1224                 sc->peer_pkeys[i].x509=x;
1225                 sc->peer_key= &(sc->peer_pkeys[i]);
1226
1227                 if (s->session->peer != NULL)
1228                         X509_free(s->session->peer);
1229                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1230                 s->session->peer=x;
1231                 }
1232         else
1233                 {
1234                 sc->peer_cert_type=i;
1235                 sc->peer_key= NULL;
1236
1237                 if (s->session->peer != NULL)
1238                         X509_free(s->session->peer);
1239                 s->session->peer=NULL;
1240                 }
1241         s->session->verify_result = s->verify_result;
1242
1243         x=NULL;
1244         ret=1;
1245
1246         if (0)
1247                 {
1248 f_err:
1249                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1250                 }
1251 err:
1252         EVP_PKEY_free(pkey);
1253         X509_free(x);
1254         sk_X509_pop_free(sk,X509_free);
1255         return(ret);
1256         }
1257
1258 int ssl3_get_key_exchange(SSL *s)
1259         {
1260 #ifndef OPENSSL_NO_RSA
1261         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1262 #endif
1263         EVP_MD_CTX md_ctx;
1264         unsigned char *param,*p;
1265         int al,i,j,param_len,ok;
1266         long n,alg_k,alg_a;
1267         EVP_PKEY *pkey=NULL;
1268         const EVP_MD *md = NULL;
1269 #ifndef OPENSSL_NO_RSA
1270         RSA *rsa=NULL;
1271 #endif
1272 #ifndef OPENSSL_NO_DH
1273         DH *dh=NULL;
1274 #endif
1275 #ifndef OPENSSL_NO_ECDH
1276         EC_KEY *ecdh = NULL;
1277         BN_CTX *bn_ctx = NULL;
1278         EC_POINT *srvr_ecpoint = NULL;
1279         int curve_nid = 0;
1280         int encoded_pt_len = 0;
1281 #endif
1282
1283         /* use same message size as in ssl3_get_certificate_request()
1284          * as ServerKeyExchange message may be skipped */
1285         n=s->method->ssl_get_message(s,
1286                 SSL3_ST_CR_KEY_EXCH_A,
1287                 SSL3_ST_CR_KEY_EXCH_B,
1288                 -1,
1289                 s->max_cert_list,
1290                 &ok);
1291         if (!ok) return((int)n);
1292
1293         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1294                 {
1295 #ifndef OPENSSL_NO_PSK
1296                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1297                    omitted if no identity hint is sent. Set
1298                    session->sess_cert anyway to avoid problems
1299                    later.*/
1300                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1301                         {
1302                         s->session->sess_cert=ssl_sess_cert_new();
1303                         if (s->ctx->psk_identity_hint)
1304                                 OPENSSL_free(s->ctx->psk_identity_hint);
1305                         s->ctx->psk_identity_hint = NULL;
1306                         }
1307 #endif
1308                 s->s3->tmp.reuse_message=1;
1309                 return(1);
1310                 }
1311
1312         param=p=(unsigned char *)s->init_msg;
1313         if (s->session->sess_cert != NULL)
1314                 {
1315 #ifndef OPENSSL_NO_RSA
1316                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1317                         {
1318                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1319                         s->session->sess_cert->peer_rsa_tmp=NULL;
1320                         }
1321 #endif
1322 #ifndef OPENSSL_NO_DH
1323                 if (s->session->sess_cert->peer_dh_tmp)
1324                         {
1325                         DH_free(s->session->sess_cert->peer_dh_tmp);
1326                         s->session->sess_cert->peer_dh_tmp=NULL;
1327                         }
1328 #endif
1329 #ifndef OPENSSL_NO_ECDH
1330                 if (s->session->sess_cert->peer_ecdh_tmp)
1331                         {
1332                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1333                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1334                         }
1335 #endif
1336                 }
1337         else
1338                 {
1339                 s->session->sess_cert=ssl_sess_cert_new();
1340                 }
1341
1342         param_len=0;
1343         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1344         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1345         EVP_MD_CTX_init(&md_ctx);
1346
1347 #ifndef OPENSSL_NO_PSK
1348         if (alg_k & SSL_kPSK)
1349                 {
1350                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1351
1352                 al=SSL_AD_HANDSHAKE_FAILURE;
1353                 n2s(p,i);
1354                 param_len=i+2;
1355                 /* Store PSK identity hint for later use, hint is used
1356                  * in ssl3_send_client_key_exchange.  Assume that the
1357                  * maximum length of a PSK identity hint can be as
1358                  * long as the maximum length of a PSK identity. */
1359                 if (i > PSK_MAX_IDENTITY_LEN)
1360                         {
1361                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1362                                 SSL_R_DATA_LENGTH_TOO_LONG);
1363                         goto f_err;
1364                         }
1365                 if (param_len > n)
1366                         {
1367                         al=SSL_AD_DECODE_ERROR;
1368                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1369                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1370                         goto f_err;
1371                         }
1372                 /* If received PSK identity hint contains NULL
1373                  * characters, the hint is truncated from the first
1374                  * NULL. p may not be ending with NULL, so create a
1375                  * NULL-terminated string. */
1376                 memcpy(tmp_id_hint, p, i);
1377                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1378                 if (s->ctx->psk_identity_hint != NULL)
1379                         OPENSSL_free(s->ctx->psk_identity_hint);
1380                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1381                 if (s->ctx->psk_identity_hint == NULL)
1382                         {
1383                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1384                         goto f_err;
1385                         }
1386
1387                 p+=i;
1388                 n-=param_len;
1389                 }
1390         else
1391 #endif /* !OPENSSL_NO_PSK */
1392 #ifndef OPENSSL_NO_SRP
1393         if (alg_k & SSL_kSRP)
1394                 {
1395                 n2s(p,i);
1396                 param_len=i+2;
1397                 if (param_len > n)
1398                         {
1399                         al=SSL_AD_DECODE_ERROR;
1400                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1401                         goto f_err;
1402                         }
1403                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1404                         {
1405                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1406                         goto err;
1407                         }
1408                 p+=i;
1409
1410                 n2s(p,i);
1411                 param_len+=i+2;
1412                 if (param_len > n)
1413                         {
1414                         al=SSL_AD_DECODE_ERROR;
1415                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1416                         goto f_err;
1417                         }
1418                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1419                         {
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1421                         goto err;
1422                         }
1423                 p+=i;
1424
1425                 i = (unsigned int)(p[0]);
1426                 p++;
1427                 param_len+=i+1;
1428                 if (param_len > n)
1429                         {
1430                         al=SSL_AD_DECODE_ERROR;
1431                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1432                         goto f_err;
1433                         }
1434                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1435                         {
1436                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1437                         goto err;
1438                         }
1439                 p+=i;
1440
1441                 n2s(p,i);
1442                 param_len+=i+2;
1443                 if (param_len > n)
1444                         {
1445                         al=SSL_AD_DECODE_ERROR;
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1447                         goto f_err;
1448                         }
1449                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1450                         {
1451                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1452                         goto err;
1453                         }
1454                 p+=i;
1455                 n-=param_len;
1456
1457 /* We must check if there is a certificate */
1458 #ifndef OPENSSL_NO_RSA
1459                 if (alg_a & SSL_aRSA)
1460                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1461 #else
1462                 if (0)
1463                         ;
1464 #endif
1465 #ifndef OPENSSL_NO_DSA
1466                 else if (alg_a & SSL_aDSS)
1467                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1468 #endif
1469                 }
1470         else
1471 #endif /* !OPENSSL_NO_SRP */
1472 #ifndef OPENSSL_NO_RSA
1473         if (alg_k & SSL_kRSA)
1474                 {
1475                 if ((rsa=RSA_new()) == NULL)
1476                         {
1477                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1478                         goto err;
1479                         }
1480                 n2s(p,i);
1481                 param_len=i+2;
1482                 if (param_len > n)
1483                         {
1484                         al=SSL_AD_DECODE_ERROR;
1485                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1486                         goto f_err;
1487                         }
1488                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1489                         {
1490                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1491                         goto err;
1492                         }
1493                 p+=i;
1494
1495                 n2s(p,i);
1496                 param_len+=i+2;
1497                 if (param_len > n)
1498                         {
1499                         al=SSL_AD_DECODE_ERROR;
1500                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1501                         goto f_err;
1502                         }
1503                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1504                         {
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1506                         goto err;
1507                         }
1508                 p+=i;
1509                 n-=param_len;
1510
1511                 /* this should be because we are using an export cipher */
1512                 if (alg_a & SSL_aRSA)
1513                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1514                 else
1515                         {
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1517                         goto err;
1518                         }
1519                 s->session->sess_cert->peer_rsa_tmp=rsa;
1520                 rsa=NULL;
1521                 }
1522 #else /* OPENSSL_NO_RSA */
1523         if (0)
1524                 ;
1525 #endif
1526 #ifndef OPENSSL_NO_DH
1527         else if (alg_k & SSL_kEDH)
1528                 {
1529                 if ((dh=DH_new()) == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1532                         goto err;
1533                         }
1534                 n2s(p,i);
1535                 param_len=i+2;
1536                 if (param_len > n)
1537                         {
1538                         al=SSL_AD_DECODE_ERROR;
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1540                         goto f_err;
1541                         }
1542                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1543                         {
1544                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1545                         goto err;
1546                         }
1547                 p+=i;
1548
1549                 n2s(p,i);
1550                 param_len+=i+2;
1551                 if (param_len > n)
1552                         {
1553                         al=SSL_AD_DECODE_ERROR;
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1555                         goto f_err;
1556                         }
1557                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1558                         {
1559                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1560                         goto err;
1561                         }
1562                 p+=i;
1563
1564                 n2s(p,i);
1565                 param_len+=i+2;
1566                 if (param_len > n)
1567                         {
1568                         al=SSL_AD_DECODE_ERROR;
1569                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1570                         goto f_err;
1571                         }
1572                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1573                         {
1574                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1575                         goto err;
1576                         }
1577                 p+=i;
1578                 n-=param_len;
1579
1580 #ifndef OPENSSL_NO_RSA
1581                 if (alg_a & SSL_aRSA)
1582                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1583 #else
1584                 if (0)
1585                         ;
1586 #endif
1587 #ifndef OPENSSL_NO_DSA
1588                 else if (alg_a & SSL_aDSS)
1589                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1590 #endif
1591                 /* else anonymous DH, so no certificate or pkey. */
1592
1593                 s->session->sess_cert->peer_dh_tmp=dh;
1594                 dh=NULL;
1595                 }
1596         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1597                 {
1598                 al=SSL_AD_ILLEGAL_PARAMETER;
1599                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1600                 goto f_err;
1601                 }
1602 #endif /* !OPENSSL_NO_DH */
1603
1604 #ifndef OPENSSL_NO_ECDH
1605         else if (alg_k & SSL_kEECDH)
1606                 {
1607                 EC_GROUP *ngroup;
1608                 const EC_GROUP *group;
1609
1610                 if ((ecdh=EC_KEY_new()) == NULL)
1611                         {
1612                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1613                         goto err;
1614                         }
1615
1616                 /* Extract elliptic curve parameters and the
1617                  * server's ephemeral ECDH public key.
1618                  * Keep accumulating lengths of various components in
1619                  * param_len and make sure it never exceeds n.
1620                  */
1621
1622                 /* XXX: For now we only support named (not generic) curves
1623                  * and the ECParameters in this case is just three bytes.
1624                  */
1625                 param_len=3;
1626                 if ((param_len > n) ||
1627                     (*p != NAMED_CURVE_TYPE) ||
1628                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1629                         {
1630                         al=SSL_AD_INTERNAL_ERROR;
1631                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1632                         goto f_err;
1633                         }
1634
1635                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1636                 if (ngroup == NULL)
1637                         {
1638                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1639                         goto err;
1640                         }
1641                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1644                         goto err;
1645                         }
1646                 EC_GROUP_free(ngroup);
1647
1648                 group = EC_KEY_get0_group(ecdh);
1649
1650                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1651                     (EC_GROUP_get_degree(group) > 163))
1652                         {
1653                         al=SSL_AD_EXPORT_RESTRICTION;
1654                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1655                         goto f_err;
1656                         }
1657
1658                 p+=3;
1659
1660                 /* Next, get the encoded ECPoint */
1661                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1662                     ((bn_ctx = BN_CTX_new()) == NULL))
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1665                         goto err;
1666                         }
1667
1668                 encoded_pt_len = *p;  /* length of encoded point */
1669                 p+=1;
1670                 param_len += (1 + encoded_pt_len);
1671                 if ((param_len > n) ||
1672                     (EC_POINT_oct2point(group, srvr_ecpoint,
1673                         p, encoded_pt_len, bn_ctx) == 0))
1674                         {
1675                         al=SSL_AD_DECODE_ERROR;
1676                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1677                         goto f_err;
1678                         }
1679
1680                 n-=param_len;
1681                 p+=encoded_pt_len;
1682
1683                 /* The ECC/TLS specification does not mention
1684                  * the use of DSA to sign ECParameters in the server
1685                  * key exchange message. We do support RSA and ECDSA.
1686                  */
1687                 if (0) ;
1688 #ifndef OPENSSL_NO_RSA
1689                 else if (alg_a & SSL_aRSA)
1690                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1691 #endif
1692 #ifndef OPENSSL_NO_ECDSA
1693                 else if (alg_a & SSL_aECDSA)
1694                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1695 #endif
1696                 /* else anonymous ECDH, so no certificate or pkey. */
1697                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1698                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1699                 ecdh=NULL;
1700                 BN_CTX_free(bn_ctx);
1701                 bn_ctx = NULL;
1702                 EC_POINT_free(srvr_ecpoint);
1703                 srvr_ecpoint = NULL;
1704                 }
1705         else if (alg_k)
1706                 {
1707                 al=SSL_AD_UNEXPECTED_MESSAGE;
1708                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1709                 goto f_err;
1710                 }
1711 #endif /* !OPENSSL_NO_ECDH */
1712
1713
1714         /* p points to the next byte, there are 'n' bytes left */
1715
1716         /* if it was signed, check the signature */
1717         if (pkey != NULL)
1718                 {
1719                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1720                         {
1721                         int sigalg = tls12_get_sigid(pkey);
1722                         /* Should never happen */
1723                         if (sigalg == -1)
1724                                 {
1725                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1726                                 goto err;
1727                                 }
1728                         /* Check key type is consistent with signature */
1729                         if (sigalg != (int)p[1])
1730                                 {
1731                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1732                                 al=SSL_AD_DECODE_ERROR;
1733                                 goto f_err;
1734                                 }
1735                         md = tls12_get_hash(p[0]);
1736                         if (md == NULL)
1737                                 {
1738                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1739                                 al=SSL_AD_DECODE_ERROR;
1740                                 goto f_err;
1741                                 }
1742 #ifdef SSL_DEBUG
1743 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1744 #endif
1745                         p += 2;
1746                         n -= 2;
1747                         }
1748                 else
1749                         md = EVP_sha1();
1750
1751                 n2s(p,i);
1752                 n-=2;
1753                 j=EVP_PKEY_size(pkey);
1754
1755                 if ((i != n) || (n > j) || (n <= 0))
1756                         {
1757                         /* wrong packet length */
1758                         al=SSL_AD_DECODE_ERROR;
1759                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1760                         goto f_err;
1761                         }
1762
1763 #ifndef OPENSSL_NO_RSA
1764                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1765                         {
1766                         int num;
1767
1768                         j=0;
1769                         q=md_buf;
1770                         for (num=2; num > 0; num--)
1771                                 {
1772                                 EVP_MD_CTX_set_flags(&md_ctx,
1773                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1774                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1775                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1776                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1777                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1778                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1779                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1780                                 q+=i;
1781                                 j+=i;
1782                                 }
1783                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1784                                                                 pkey->pkey.rsa);
1785                         if (i < 0)
1786                                 {
1787                                 al=SSL_AD_DECRYPT_ERROR;
1788                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1789                                 goto f_err;
1790                                 }
1791                         if (i == 0)
1792                                 {
1793                                 /* bad signature */
1794                                 al=SSL_AD_DECRYPT_ERROR;
1795                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1796                                 goto f_err;
1797                                 }
1798                         }
1799                 else
1800 #endif
1801                         {
1802                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1803                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1804                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1805                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1806                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1807                                 {
1808                                 /* bad signature */
1809                                 al=SSL_AD_DECRYPT_ERROR;
1810                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1811                                 goto f_err;
1812                                 }
1813                         }
1814                 }
1815         else
1816                 {
1817                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1818                         /* aNULL or kPSK do not need public keys */
1819                         {
1820                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1821                         goto err;
1822                         }
1823                 /* still data left over */
1824                 if (n != 0)
1825                         {
1826                         al=SSL_AD_DECODE_ERROR;
1827                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1828                         goto f_err;
1829                         }
1830                 }
1831         EVP_PKEY_free(pkey);
1832         EVP_MD_CTX_cleanup(&md_ctx);
1833         return(1);
1834 f_err:
1835         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1836 err:
1837         EVP_PKEY_free(pkey);
1838 #ifndef OPENSSL_NO_RSA
1839         if (rsa != NULL)
1840                 RSA_free(rsa);
1841 #endif
1842 #ifndef OPENSSL_NO_DH
1843         if (dh != NULL)
1844                 DH_free(dh);
1845 #endif
1846 #ifndef OPENSSL_NO_ECDH
1847         BN_CTX_free(bn_ctx);
1848         EC_POINT_free(srvr_ecpoint);
1849         if (ecdh != NULL)
1850                 EC_KEY_free(ecdh);
1851 #endif
1852         EVP_MD_CTX_cleanup(&md_ctx);
1853         return(-1);
1854         }
1855
1856 int ssl3_get_certificate_request(SSL *s)
1857         {
1858         int ok,ret=0;
1859         unsigned long n,nc,l;
1860         unsigned int llen, ctype_num,i;
1861         X509_NAME *xn=NULL;
1862         const unsigned char *p,*q;
1863         unsigned char *d;
1864         STACK_OF(X509_NAME) *ca_sk=NULL;
1865
1866         n=s->method->ssl_get_message(s,
1867                 SSL3_ST_CR_CERT_REQ_A,
1868                 SSL3_ST_CR_CERT_REQ_B,
1869                 -1,
1870                 s->max_cert_list,
1871                 &ok);
1872
1873         if (!ok) return((int)n);
1874
1875         s->s3->tmp.cert_req=0;
1876
1877         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1878                 {
1879                 s->s3->tmp.reuse_message=1;
1880                 /* If we get here we don't need any cached handshake records
1881                  * as we wont be doing client auth.
1882                  */
1883                 if (s->s3->handshake_buffer)
1884                         {
1885                         if (!ssl3_digest_cached_records(s))
1886                                 goto err;
1887                         }
1888                 return(1);
1889                 }
1890
1891         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1892                 {
1893                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1894                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1895                 goto err;
1896                 }
1897
1898         /* TLS does not like anon-DH with client cert */
1899         if (s->version > SSL3_VERSION)
1900                 {
1901                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1902                         {
1903                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1904                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1905                         goto err;
1906                         }
1907                 }
1908
1909         p=d=(unsigned char *)s->init_msg;
1910
1911         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1912                 {
1913                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1914                 goto err;
1915                 }
1916
1917         /* get the certificate types */
1918         ctype_num= *(p++);
1919         if (ctype_num > SSL3_CT_NUMBER)
1920                 ctype_num=SSL3_CT_NUMBER;
1921         for (i=0; i<ctype_num; i++)
1922                 s->s3->tmp.ctype[i]= p[i];
1923         p+=ctype_num;
1924         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1925                 {
1926                 n2s(p, llen);
1927                 /* Check we have enough room for signature algorithms and
1928                  * following length value.
1929                  */
1930                 if ((unsigned long)(p - d + llen + 2) > n)
1931                         {
1932                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1933                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1934                         goto err;
1935                         }
1936                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1937                         {
1938                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1939                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1940                         goto err;
1941                         }
1942                 p += llen;
1943                 }
1944
1945         /* get the CA RDNs */
1946         n2s(p,llen);
1947 #if 0
1948 {
1949 FILE *out;
1950 out=fopen("/tmp/vsign.der","w");
1951 fwrite(p,1,llen,out);
1952 fclose(out);
1953 }
1954 #endif
1955
1956         if ((unsigned long)(p - d + llen) != n)
1957                 {
1958                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1959                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1960                 goto err;
1961                 }
1962
1963         for (nc=0; nc<llen; )
1964                 {
1965                 n2s(p,l);
1966                 if ((l+nc+2) > llen)
1967                         {
1968                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1969                                 goto cont; /* netscape bugs */
1970                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1971                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1972                         goto err;
1973                         }
1974
1975                 q=p;
1976
1977                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1978                         {
1979                         /* If netscape tolerance is on, ignore errors */
1980                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1981                                 goto cont;
1982                         else
1983                                 {
1984                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1985                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1986                                 goto err;
1987                                 }
1988                         }
1989
1990                 if (q != (p+l))
1991                         {
1992                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1993                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1994                         goto err;
1995                         }
1996                 if (!sk_X509_NAME_push(ca_sk,xn))
1997                         {
1998                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1999                         goto err;
2000                         }
2001
2002                 p+=l;
2003                 nc+=l+2;
2004                 }
2005
2006         if (0)
2007                 {
2008 cont:
2009                 ERR_clear_error();
2010                 }
2011
2012         /* we should setup a certificate to return.... */
2013         s->s3->tmp.cert_req=1;
2014         s->s3->tmp.ctype_num=ctype_num;
2015         if (s->s3->tmp.ca_names != NULL)
2016                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2017         s->s3->tmp.ca_names=ca_sk;
2018         ca_sk=NULL;
2019
2020         ret=1;
2021 err:
2022         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2023         return(ret);
2024         }
2025
2026 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2027         {
2028         return(X509_NAME_cmp(*a,*b));
2029         }
2030 #ifndef OPENSSL_NO_TLSEXT
2031 int ssl3_get_new_session_ticket(SSL *s)
2032         {
2033         int ok,al,ret=0, ticklen;
2034         long n;
2035         const unsigned char *p;
2036         unsigned char *d;
2037
2038         n=s->method->ssl_get_message(s,
2039                 SSL3_ST_CR_SESSION_TICKET_A,
2040                 SSL3_ST_CR_SESSION_TICKET_B,
2041                 -1,
2042                 16384,
2043                 &ok);
2044
2045         if (!ok)
2046                 return((int)n);
2047
2048         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2049                 {
2050                 s->s3->tmp.reuse_message=1;
2051                 return(1);
2052                 }
2053         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2054                 {
2055                 al=SSL_AD_UNEXPECTED_MESSAGE;
2056                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2057                 goto f_err;
2058                 }
2059         if (n < 6)
2060                 {
2061                 /* need at least ticket_lifetime_hint + ticket length */
2062                 al = SSL_AD_DECODE_ERROR;
2063                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2064                 goto f_err;
2065                 }
2066
2067         p=d=(unsigned char *)s->init_msg;
2068         n2l(p, s->session->tlsext_tick_lifetime_hint);
2069         n2s(p, ticklen);
2070         /* ticket_lifetime_hint + ticket_length + ticket */
2071         if (ticklen + 6 != n)
2072                 {
2073                 al = SSL_AD_DECODE_ERROR;
2074                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2075                 goto f_err;
2076                 }
2077         if (s->session->tlsext_tick)
2078                 {
2079                 OPENSSL_free(s->session->tlsext_tick);
2080                 s->session->tlsext_ticklen = 0;
2081                 }
2082         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2083         if (!s->session->tlsext_tick)
2084                 {
2085                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2086                 goto err;
2087                 }
2088         memcpy(s->session->tlsext_tick, p, ticklen);
2089         s->session->tlsext_ticklen = ticklen;
2090         /* There are two ways to detect a resumed ticket sesion.
2091          * One is to set an appropriate session ID and then the server
2092          * must return a match in ServerHello. This allows the normal
2093          * client session ID matching to work and we know much
2094          * earlier that the ticket has been accepted.
2095          *
2096          * The other way is to set zero length session ID when the
2097          * ticket is presented and rely on the handshake to determine
2098          * session resumption.
2099          *
2100          * We choose the former approach because this fits in with
2101          * assumptions elsewhere in OpenSSL. The session ID is set
2102          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2103          * ticket.
2104          */
2105         EVP_Digest(p, ticklen,
2106                         s->session->session_id, &s->session->session_id_length,
2107 #ifndef OPENSSL_NO_SHA256
2108                                                         EVP_sha256(), NULL);
2109 #else
2110                                                         EVP_sha1(), NULL);
2111 #endif
2112         ret=1;
2113         return(ret);
2114 f_err:
2115         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2116 err:
2117         return(-1);
2118         }
2119
2120 int ssl3_get_cert_status(SSL *s)
2121         {
2122         int ok, al;
2123         unsigned long resplen,n;
2124         const unsigned char *p;
2125
2126         n=s->method->ssl_get_message(s,
2127                 SSL3_ST_CR_CERT_STATUS_A,
2128                 SSL3_ST_CR_CERT_STATUS_B,
2129                 SSL3_MT_CERTIFICATE_STATUS,
2130                 16384,
2131                 &ok);
2132
2133         if (!ok) return((int)n);
2134         if (n < 4)
2135                 {
2136                 /* need at least status type + length */
2137                 al = SSL_AD_DECODE_ERROR;
2138                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2139                 goto f_err;
2140                 }
2141         p = (unsigned char *)s->init_msg;
2142         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2143                 {
2144                 al = SSL_AD_DECODE_ERROR;
2145                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2146                 goto f_err;
2147                 }
2148         n2l3(p, resplen);
2149         if (resplen + 4 != n)
2150                 {
2151                 al = SSL_AD_DECODE_ERROR;
2152                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2153                 goto f_err;
2154                 }
2155         if (s->tlsext_ocsp_resp)
2156                 OPENSSL_free(s->tlsext_ocsp_resp);
2157         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2158         if (!s->tlsext_ocsp_resp)
2159                 {
2160                 al = SSL_AD_INTERNAL_ERROR;
2161                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2162                 goto f_err;
2163                 }
2164         s->tlsext_ocsp_resplen = resplen;
2165         if (s->ctx->tlsext_status_cb)
2166                 {
2167                 int ret;
2168                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2169                 if (ret == 0)
2170                         {
2171                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2172                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2173                         goto f_err;
2174                         }
2175                 if (ret < 0)
2176                         {
2177                         al = SSL_AD_INTERNAL_ERROR;
2178                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2179                         goto f_err;
2180                         }
2181                 }
2182         return 1;
2183 f_err:
2184         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2185         return(-1);
2186         }
2187 #endif
2188
2189 int ssl3_get_server_done(SSL *s)
2190         {
2191         int ok,ret=0;
2192         long n;
2193
2194         n=s->method->ssl_get_message(s,
2195                 SSL3_ST_CR_SRVR_DONE_A,
2196                 SSL3_ST_CR_SRVR_DONE_B,
2197                 SSL3_MT_SERVER_DONE,
2198                 30, /* should be very small, like 0 :-) */
2199                 &ok);
2200
2201         if (!ok) return((int)n);
2202         if (n > 0)
2203                 {
2204                 /* should contain no data */
2205                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2206                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2207                 return -1;
2208                 }
2209         ret=1;
2210         return(ret);
2211         }
2212
2213
2214 int ssl3_send_client_key_exchange(SSL *s)
2215         {
2216         unsigned char *p,*d;
2217         int n;
2218         unsigned long alg_k;
2219 #ifndef OPENSSL_NO_RSA
2220         unsigned char *q;
2221         EVP_PKEY *pkey=NULL;
2222 #endif
2223 #ifndef OPENSSL_NO_KRB5
2224         KSSL_ERR kssl_err;
2225 #endif /* OPENSSL_NO_KRB5 */
2226 #ifndef OPENSSL_NO_ECDH
2227         EC_KEY *clnt_ecdh = NULL;
2228         const EC_POINT *srvr_ecpoint = NULL;
2229         EVP_PKEY *srvr_pub_pkey = NULL;
2230         unsigned char *encodedPoint = NULL;
2231         int encoded_pt_len = 0;
2232         BN_CTX * bn_ctx = NULL;
2233 #endif
2234
2235         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2236                 {
2237                 d=(unsigned char *)s->init_buf->data;
2238                 p= &(d[4]);
2239
2240                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2241
2242                 /* Fool emacs indentation */
2243                 if (0) {}
2244 #ifndef OPENSSL_NO_RSA
2245                 else if (alg_k & SSL_kRSA)
2246                         {
2247                         RSA *rsa;
2248                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2249
2250                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2251                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2252                         else
2253                                 {
2254                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2255                                 if ((pkey == NULL) ||
2256                                         (pkey->type != EVP_PKEY_RSA) ||
2257                                         (pkey->pkey.rsa == NULL))
2258                                         {
2259                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2260                                         goto err;
2261                                         }
2262                                 rsa=pkey->pkey.rsa;
2263                                 EVP_PKEY_free(pkey);
2264                                 }
2265
2266                         tmp_buf[0]=s->client_version>>8;
2267                         tmp_buf[1]=s->client_version&0xff;
2268                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2269                                         goto err;
2270
2271                         s->session->master_key_length=sizeof tmp_buf;
2272
2273                         q=p;
2274                         /* Fix buf for TLS and beyond */
2275                         if (s->version > SSL3_VERSION)
2276                                 p+=2;
2277                         n=RSA_public_encrypt(sizeof tmp_buf,
2278                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2279 #ifdef PKCS1_CHECK
2280                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2281                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2282 #endif
2283                         if (n <= 0)
2284                                 {
2285                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2286                                 goto err;
2287                                 }
2288
2289                         /* Fix buf for TLS and beyond */
2290                         if (s->version > SSL3_VERSION)
2291                                 {
2292                                 s2n(n,q);
2293                                 n+=2;
2294                                 }
2295
2296                         s->session->master_key_length=
2297                                 s->method->ssl3_enc->generate_master_secret(s,
2298                                         s->session->master_key,
2299                                         tmp_buf,sizeof tmp_buf);
2300                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2301                         }
2302 #endif
2303 #ifndef OPENSSL_NO_KRB5
2304                 else if (alg_k & SSL_kKRB5)
2305                         {
2306                         krb5_error_code krb5rc;
2307                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2308                         /*  krb5_data   krb5_ap_req;  */
2309                         krb5_data       *enc_ticket;
2310                         krb5_data       authenticator, *authp = NULL;
2311                         EVP_CIPHER_CTX  ciph_ctx;
2312                         const EVP_CIPHER *enc = NULL;
2313                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2314                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2315                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2316                                                 + EVP_MAX_IV_LENGTH];
2317                         int             padl, outl = sizeof(epms);
2318
2319                         EVP_CIPHER_CTX_init(&ciph_ctx);
2320
2321 #ifdef KSSL_DEBUG
2322                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2323                                 alg_k, SSL_kKRB5);
2324 #endif  /* KSSL_DEBUG */
2325
2326                         authp = NULL;
2327 #ifdef KRB5SENDAUTH
2328                         if (KRB5SENDAUTH)  authp = &authenticator;
2329 #endif  /* KRB5SENDAUTH */
2330
2331                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2332                                 &kssl_err);
2333                         enc = kssl_map_enc(kssl_ctx->enctype);
2334                         if (enc == NULL)
2335                             goto err;
2336 #ifdef KSSL_DEBUG
2337                         {
2338                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2339                         if (krb5rc && kssl_err.text)
2340                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2341                         }
2342 #endif  /* KSSL_DEBUG */
2343
2344                         if (krb5rc)
2345                                 {
2346                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2347                                                 SSL_AD_HANDSHAKE_FAILURE);
2348                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2349                                                 kssl_err.reason);
2350                                 goto err;
2351                                 }
2352
2353                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2354                         **  in place of RFC 2712 KerberosWrapper, as in:
2355                         **
2356                         **  Send ticket (copy to *p, set n = length)
2357                         **  n = krb5_ap_req.length;
2358                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2359                         **  if (krb5_ap_req.data)
2360                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2361                         **
2362                         **  Now using real RFC 2712 KerberosWrapper
2363                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2364                         **  Note: 2712 "opaque" types are here replaced
2365                         **  with a 2-byte length followed by the value.
2366                         **  Example:
2367                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2368                         **  Where "xx xx" = length bytes.  Shown here with
2369                         **  optional authenticator omitted.
2370                         */
2371
2372                         /*  KerberosWrapper.Ticket              */
2373                         s2n(enc_ticket->length,p);
2374                         memcpy(p, enc_ticket->data, enc_ticket->length);
2375                         p+= enc_ticket->length;
2376                         n = enc_ticket->length + 2;
2377
2378                         /*  KerberosWrapper.Authenticator       */
2379                         if (authp  &&  authp->length)
2380                                 {
2381                                 s2n(authp->length,p);
2382                                 memcpy(p, authp->data, authp->length);
2383                                 p+= authp->length;
2384                                 n+= authp->length + 2;
2385
2386                                 free(authp->data);
2387                                 authp->data = NULL;
2388                                 authp->length = 0;
2389                                 }
2390                         else
2391                                 {
2392                                 s2n(0,p);/*  null authenticator length  */
2393                                 n+=2;
2394                                 }
2395
2396                             tmp_buf[0]=s->client_version>>8;
2397                             tmp_buf[1]=s->client_version&0xff;
2398                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2399                                 goto err;
2400
2401                         /*  20010420 VRS.  Tried it this way; failed.
2402                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2403                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2404                         **                              kssl_ctx->length);
2405                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2406                         */
2407
2408                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2409                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2410                                 kssl_ctx->key,iv);
2411                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2412                                 sizeof tmp_buf);
2413                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2414                         outl += padl;
2415                         if (outl > (int)sizeof epms)
2416                                 {
2417                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2418                                 goto err;
2419                                 }
2420                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2421
2422                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2423                         s2n(outl,p);
2424                         memcpy(p, epms, outl);
2425                         p+=outl;
2426                         n+=outl + 2;
2427
2428                         s->session->master_key_length=
2429                                 s->method->ssl3_enc->generate_master_secret(s,
2430                                         s->session->master_key,
2431                                         tmp_buf, sizeof tmp_buf);
2432
2433                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2434                         OPENSSL_cleanse(epms, outl);
2435                         }
2436 #endif
2437 #ifndef OPENSSL_NO_DH
2438                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2439                         {
2440                         DH *dh_srvr,*dh_clnt;
2441
2442                         if (s->session->sess_cert == NULL)
2443                                 {
2444                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2445                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2446                                 goto err;
2447                                 }
2448
2449                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2450                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2451                         else
2452                                 {
2453                                 /* we get them from the cert */
2454                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2455                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2456                                 goto err;
2457                                 }
2458
2459                         /* generate a new random key */
2460                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2461                                 {
2462                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2463                                 goto err;
2464                                 }
2465                         if (!DH_generate_key(dh_clnt))
2466                                 {
2467                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2468                                 DH_free(dh_clnt);
2469                                 goto err;
2470                                 }
2471
2472                         /* use the 'p' output buffer for the DH key, but
2473                          * make sure to clear it out afterwards */
2474
2475                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2476
2477                         if (n <= 0)
2478                                 {
2479                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2480                                 DH_free(dh_clnt);
2481                                 goto err;
2482                                 }
2483
2484                         /* generate master key from the result */
2485                         s->session->master_key_length=
2486                                 s->method->ssl3_enc->generate_master_secret(s,
2487                                         s->session->master_key,p,n);
2488                         /* clean up */
2489                         memset(p,0,n);
2490
2491                         /* send off the data */
2492                         n=BN_num_bytes(dh_clnt->pub_key);
2493                         s2n(n,p);
2494                         BN_bn2bin(dh_clnt->pub_key,p);
2495                         n+=2;
2496
2497                         DH_free(dh_clnt);
2498
2499                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2500                         }
2501 #endif
2502
2503 #ifndef OPENSSL_NO_ECDH
2504                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2505                         {
2506                         const EC_GROUP *srvr_group = NULL;
2507                         EC_KEY *tkey;
2508                         int ecdh_clnt_cert = 0;
2509                         int field_size = 0;
2510
2511                         /* Did we send out the client's
2512                          * ECDH share for use in premaster
2513                          * computation as part of client certificate?
2514                          * If so, set ecdh_clnt_cert to 1.
2515                          */
2516                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2517                                 {
2518                                 /* XXX: For now, we do not support client
2519                                  * authentication using ECDH certificates.
2520                                  * To add such support, one needs to add
2521                                  * code that checks for appropriate
2522                                  * conditions and sets ecdh_clnt_cert to 1.
2523                                  * For example, the cert have an ECC
2524                                  * key on the same curve as the server's
2525                                  * and the key should be authorized for
2526                                  * key agreement.
2527                                  *
2528                                  * One also needs to add code in ssl3_connect
2529                                  * to skip sending the certificate verify
2530                                  * message.
2531                                  *
2532                                  * if ((s->cert->key->privatekey != NULL) &&
2533                                  *     (s->cert->key->privatekey->type ==
2534                                  *      EVP_PKEY_EC) && ...)
2535                                  * ecdh_clnt_cert = 1;
2536                                  */
2537                                 }
2538
2539                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2540                                 {
2541                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2542                                 }
2543                         else
2544                                 {
2545                                 /* Get the Server Public Key from Cert */
2546                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2547                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2548                                 if ((srvr_pub_pkey == NULL) ||
2549                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2550                                     (srvr_pub_pkey->pkey.ec == NULL))
2551                                         {
2552                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2553                                             ERR_R_INTERNAL_ERROR);
2554                                         goto err;
2555                                         }
2556
2557                                 tkey = srvr_pub_pkey->pkey.ec;
2558                                 }
2559
2560                         srvr_group   = EC_KEY_get0_group(tkey);
2561                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2562
2563                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2564                                 {
2565                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2566                                     ERR_R_INTERNAL_ERROR);
2567                                 goto err;
2568                                 }
2569
2570                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2571                                 {
2572                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2573                                 goto err;
2574                                 }
2575
2576                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2577                                 {
2578                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2579                                 goto err;
2580                                 }
2581                         if (ecdh_clnt_cert)
2582                                 {
2583                                 /* Reuse key info from our certificate
2584                                  * We only need our private key to perform
2585                                  * the ECDH computation.
2586                                  */
2587                                 const BIGNUM *priv_key;
2588                                 tkey = s->cert->key->privatekey->pkey.ec;
2589                                 priv_key = EC_KEY_get0_private_key(tkey);
2590                                 if (priv_key == NULL)
2591                                         {
2592                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2593                                         goto err;
2594                                         }
2595                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2596                                         {
2597                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2598                                         goto err;
2599                                         }
2600                                 }
2601                         else
2602                                 {
2603                                 /* Generate a new ECDH key pair */
2604                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2605                                         {
2606                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2607                                         goto err;
2608                                         }
2609                                 }
2610
2611                         /* use the 'p' output buffer for the ECDH key, but
2612                          * make sure to clear it out afterwards
2613                          */
2614
2615                         field_size = EC_GROUP_get_degree(srvr_group);
2616                         if (field_size <= 0)
2617                                 {
2618                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2619                                        ERR_R_ECDH_LIB);
2620                                 goto err;
2621                                 }
2622                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2623                         if (n <= 0)
2624                                 {
2625                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2626                                        ERR_R_ECDH_LIB);
2627                                 goto err;
2628                                 }
2629
2630                         /* generate master key from the result */
2631                         s->session->master_key_length = s->method->ssl3_enc \
2632                             -> generate_master_secret(s,
2633                                 s->session->master_key,
2634                                 p, n);
2635
2636                         memset(p, 0, n); /* clean up */
2637
2638                         if (ecdh_clnt_cert)
2639                                 {
2640                                 /* Send empty client key exch message */
2641                                 n = 0;
2642                                 }
2643                         else
2644                                 {
2645                                 /* First check the size of encoding and
2646                                  * allocate memory accordingly.
2647                                  */
2648                                 encoded_pt_len =
2649                                     EC_POINT_point2oct(srvr_group,
2650                                         EC_KEY_get0_public_key(clnt_ecdh),
2651                                         POINT_CONVERSION_UNCOMPRESSED,
2652                                         NULL, 0, NULL);
2653
2654                                 encodedPoint = (unsigned char *)
2655                                     OPENSSL_malloc(encoded_pt_len *
2656                                         sizeof(unsigned char));
2657                                 bn_ctx = BN_CTX_new();
2658                                 if ((encodedPoint == NULL) ||
2659                                     (bn_ctx == NULL))
2660                                         {
2661                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2662                                         goto err;
2663                                         }
2664
2665                                 /* Encode the public key */
2666                                 n = EC_POINT_point2oct(srvr_group,
2667                                     EC_KEY_get0_public_key(clnt_ecdh),
2668                                     POINT_CONVERSION_UNCOMPRESSED,
2669                                     encodedPoint, encoded_pt_len, bn_ctx);
2670
2671                                 *p = n; /* length of encoded point */
2672                                 /* Encoded point will be copied here */
2673                                 p += 1;
2674                                 /* copy the point */
2675                                 memcpy((unsigned char *)p, encodedPoint, n);
2676                                 /* increment n to account for length field */
2677                                 n += 1;
2678                                 }
2679
2680                         /* Free allocated memory */
2681                         BN_CTX_free(bn_ctx);
2682                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2683                         if (clnt_ecdh != NULL)
2684                                  EC_KEY_free(clnt_ecdh);
2685                         EVP_PKEY_free(srvr_pub_pkey);
2686                         }
2687 #endif /* !OPENSSL_NO_ECDH */
2688                 else if (alg_k & SSL_kGOST)
2689                         {
2690                         /* GOST key exchange message creation */
2691                         EVP_PKEY_CTX *pkey_ctx;
2692                         X509 *peer_cert;
2693                         size_t msglen;
2694                         unsigned int md_len;
2695                         int keytype;
2696                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2697                         EVP_MD_CTX *ukm_hash;
2698                         EVP_PKEY *pub_key;
2699
2700                         /* Get server sertificate PKEY and create ctx from it */
2701                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2702                         if (!peer_cert)
2703                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2704                         if (!peer_cert)         {
2705                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2706                                         goto err;
2707                                 }
2708
2709                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2710                         /* If we have send a certificate, and certificate key
2711
2712                          * parameters match those of server certificate, use
2713                          * certificate key for key exchange
2714                          */
2715
2716                          /* Otherwise, generate ephemeral key pair */
2717
2718                         EVP_PKEY_encrypt_init(pkey_ctx);
2719                           /* Generate session key */
2720                     RAND_bytes(premaster_secret,32);
2721                         /* If we have client certificate, use its secret as peer key */
2722                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2723                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2724                                         /* If there was an error - just ignore it. Ephemeral key
2725                                         * would be used
2726                                         */
2727                                         ERR_clear_error();
2728                                 }
2729                         }
2730                         /* Compute shared IV and store it in algorithm-specific
2731                          * context data */
2732                         ukm_hash = EVP_MD_CTX_create();
2733                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2734                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2735                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2736                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2737                         EVP_MD_CTX_destroy(ukm_hash);
2738                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2739                                 8,shared_ukm)<0) {
2740                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2741                                                 SSL_R_LIBRARY_BUG);
2742                                         goto err;
2743                                 }
2744                         /* Make GOST keytransport blob message */
2745                         /*Encapsulate it into sequence */
2746                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2747                         msglen=255;
2748                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2749                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2750                                         SSL_R_LIBRARY_BUG);
2751                                 goto err;
2752                         }
2753                         if (msglen >= 0x80)
2754                                 {
2755                                 *(p++)=0x81;
2756                                 *(p++)= msglen & 0xff;
2757                                 n=msglen+3;
2758                                 }
2759                         else
2760                                 {
2761                                 *(p++)= msglen & 0xff;
2762                                 n=msglen+2;
2763                                 }
2764                         memcpy(p, tmp, msglen);
2765                         /* Check if pubkey from client certificate was used */
2766                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2767                                 {
2768                                 /* Set flag "skip certificate verify" */
2769                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2770                                 }
2771                         EVP_PKEY_CTX_free(pkey_ctx);
2772                         s->session->master_key_length=
2773                                 s->method->ssl3_enc->generate_master_secret(s,
2774                                         s->session->master_key,premaster_secret,32);
2775                         EVP_PKEY_free(pub_key);
2776
2777                         }
2778 #ifndef OPENSSL_NO_SRP
2779                 else if (alg_k & SSL_kSRP)
2780                         {
2781                         if (s->srp_ctx.A != NULL)
2782                                 {
2783                                 /* send off the data */
2784                                 n=BN_num_bytes(s->srp_ctx.A);
2785                                 s2n(n,p);
2786                                 BN_bn2bin(s->srp_ctx.A,p);
2787                                 n+=2;
2788                                 }
2789                         else
2790                                 {
2791                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2792                                 goto err;
2793                                 }
2794                         if (s->session->srp_username != NULL)
2795                                 OPENSSL_free(s->session->srp_username);
2796                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2797                         if (s->session->srp_username == NULL)
2798                                 {
2799                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2800                                         ERR_R_MALLOC_FAILURE);
2801                                 goto err;
2802                                 }
2803
2804                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2805                                 {
2806                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2807                                 goto err;
2808                                 }
2809                         }
2810 #endif
2811 #ifndef OPENSSL_NO_PSK
2812                 else if (alg_k & SSL_kPSK)
2813                         {
2814                         char identity[PSK_MAX_IDENTITY_LEN];
2815                         unsigned char *t = NULL;
2816                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2817                         unsigned int pre_ms_len = 0, psk_len = 0;
2818                         int psk_err = 1;
2819
2820                         n = 0;
2821                         if (s->psk_client_callback == NULL)
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2824                                         SSL_R_PSK_NO_CLIENT_CB);
2825                                 goto err;
2826                                 }
2827
2828                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2829                                 identity, PSK_MAX_IDENTITY_LEN,
2830                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2831                         if (psk_len > PSK_MAX_PSK_LEN)
2832                                 {
2833                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2834                                         ERR_R_INTERNAL_ERROR);
2835                                 goto psk_err;
2836                                 }
2837                         else if (psk_len == 0)
2838                                 {
2839                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2840                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2841                                 goto psk_err;
2842                                 }
2843
2844                         /* create PSK pre_master_secret */
2845                         pre_ms_len = 2+psk_len+2+psk_len;
2846                         t = psk_or_pre_ms;
2847                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2848                         s2n(psk_len, t);
2849                         memset(t, 0, psk_len);
2850                         t+=psk_len;
2851                         s2n(psk_len, t);
2852
2853                         if (s->session->psk_identity_hint != NULL)
2854                                 OPENSSL_free(s->session->psk_identity_hint);
2855                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2856                         if (s->ctx->psk_identity_hint != NULL &&
2857                                 s->session->psk_identity_hint == NULL)
2858                                 {
2859                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2860                                         ERR_R_MALLOC_FAILURE);
2861                                 goto psk_err;
2862                                 }
2863
2864                         if (s->session->psk_identity != NULL)
2865                                 OPENSSL_free(s->session->psk_identity);
2866                         s->session->psk_identity = BUF_strdup(identity);
2867                         if (s->session->psk_identity == NULL)
2868                                 {
2869                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2870                                         ERR_R_MALLOC_FAILURE);
2871                                 goto psk_err;
2872                                 }
2873
2874                         s->session->master_key_length =
2875                                 s->method->ssl3_enc->generate_master_secret(s,
2876                                         s->session->master_key,
2877                                         psk_or_pre_ms, pre_ms_len);
2878                         n = strlen(identity);
2879                         s2n(n, p);
2880                         memcpy(p, identity, n);
2881                         n+=2;
2882                         psk_err = 0;
2883                 psk_err:
2884                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2885                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2886                         if (psk_err != 0)
2887                                 {
2888                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2889                                 goto err;
2890                                 }
2891                         }
2892 #endif
2893                 else
2894                         {
2895                         ssl3_send_alert(s, SSL3_AL_FATAL,
2896                             SSL_AD_HANDSHAKE_FAILURE);
2897                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2898                             ERR_R_INTERNAL_ERROR);
2899                         goto err;
2900                         }
2901
2902                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2903                 l2n3(n,d);
2904
2905                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2906                 /* number of bytes to write */
2907                 s->init_num=n+4;
2908                 s->init_off=0;
2909                 }
2910
2911         /* SSL3_ST_CW_KEY_EXCH_B */
2912         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2913 err:
2914 #ifndef OPENSSL_NO_ECDH
2915         BN_CTX_free(bn_ctx);
2916         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2917         if (clnt_ecdh != NULL)
2918                 EC_KEY_free(clnt_ecdh);
2919         EVP_PKEY_free(srvr_pub_pkey);
2920 #endif
2921         return(-1);
2922         }
2923
2924 int ssl3_send_client_verify(SSL *s)
2925         {
2926         unsigned char *p,*d;
2927         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2928         EVP_PKEY *pkey;
2929         EVP_PKEY_CTX *pctx=NULL;
2930         EVP_MD_CTX mctx;
2931         unsigned u=0;
2932         unsigned long n;
2933         int j;
2934
2935         EVP_MD_CTX_init(&mctx);
2936
2937         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2938                 {
2939                 d=(unsigned char *)s->init_buf->data;
2940                 p= &(d[4]);
2941                 pkey=s->cert->key->privatekey;
2942 /* Create context from key and test if sha1 is allowed as digest */
2943                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2944                 EVP_PKEY_sign_init(pctx);
2945                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2946                         {
2947                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2948                                 s->method->ssl3_enc->cert_verify_mac(s,
2949                                                 NID_sha1,
2950                                                 &(data[MD5_DIGEST_LENGTH]));
2951                         }
2952                 else
2953                         {
2954                         ERR_clear_error();
2955                         }
2956                 /* For TLS v1.2 send signature algorithm and signature
2957                  * using agreed digest and cached handshake records.
2958                  */
2959                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2960                         {
2961                         long hdatalen = 0;
2962                         void *hdata;
2963                         const EVP_MD *md = s->cert->key->digest;
2964                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2965                                                                 &hdata);
2966                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2967                                 {
2968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2969                                                 ERR_R_INTERNAL_ERROR);
2970                                 goto err;
2971                                 }
2972                         p += 2;
2973 #ifdef SSL_DEBUG
2974                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2975                                                         EVP_MD_name(md));
2976 #endif
2977                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2978                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2979                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2980                                 {
2981                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2982                                                 ERR_R_EVP_LIB);
2983                                 goto err;
2984                                 }
2985                         s2n(u,p);
2986                         n = u + 4;
2987                         if (!ssl3_digest_cached_records(s))
2988                                 goto err;
2989                         }
2990                 else
2991 #ifndef OPENSSL_NO_RSA
2992                 if (pkey->type == EVP_PKEY_RSA)
2993                         {
2994                         s->method->ssl3_enc->cert_verify_mac(s,
2995                                 NID_md5,
2996                                 &(data[0]));
2997                         if (RSA_sign(NID_md5_sha1, data,
2998                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2999                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3000                                 {
3001                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3002                                 goto err;
3003                                 }
3004                         s2n(u,p);
3005                         n=u+2;
3006                         }
3007                 else
3008 #endif
3009 #ifndef OPENSSL_NO_DSA
3010                         if (pkey->type == EVP_PKEY_DSA)
3011                         {
3012                         if (!DSA_sign(pkey->save_type,
3013                                 &(data[MD5_DIGEST_LENGTH]),
3014                                 SHA_DIGEST_LENGTH,&(p[2]),
3015                                 (unsigned int *)&j,pkey->pkey.dsa))
3016                                 {
3017                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3018                                 goto err;
3019                                 }
3020                         s2n(j,p);
3021                         n=j+2;
3022                         }
3023                 else
3024 #endif
3025 #ifndef OPENSSL_NO_ECDSA
3026                         if (pkey->type == EVP_PKEY_EC)
3027                         {
3028                         if (!ECDSA_sign(pkey->save_type,
3029                                 &(data[MD5_DIGEST_LENGTH]),
3030                                 SHA_DIGEST_LENGTH,&(p[2]),
3031                                 (unsigned int *)&j,pkey->pkey.ec))
3032                                 {
3033                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3034                                     ERR_R_ECDSA_LIB);
3035                                 goto err;
3036                                 }
3037                         s2n(j,p);
3038                         n=j+2;
3039                         }
3040                 else
3041 #endif
3042                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3043                 {
3044                 unsigned char signbuf[64];
3045                 int i;
3046                 size_t sigsize=64;
3047                 s->method->ssl3_enc->cert_verify_mac(s,
3048                         NID_id_GostR3411_94,
3049                         data);
3050                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3051                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3052                         ERR_R_INTERNAL_ERROR);
3053                         goto err;
3054                 }
3055                 for (i=63,j=0; i>=0; j++, i--) {
3056                         p[2+j]=signbuf[i];
3057                 }
3058                 s2n(j,p);
3059                 n=j+2;
3060                 }
3061                 else
3062                 {
3063                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3064                         goto err;
3065                 }
3066                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3067                 l2n3(n,d);
3068
3069                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3070                 s->init_num=(int)n+4;
3071                 s->init_off=0;
3072                 }
3073         EVP_MD_CTX_cleanup(&mctx);
3074         EVP_PKEY_CTX_free(pctx);
3075         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3076 err:
3077         EVP_MD_CTX_cleanup(&mctx);
3078         EVP_PKEY_CTX_free(pctx);
3079         return(-1);
3080         }
3081
3082 int ssl3_send_client_certificate(SSL *s)
3083         {
3084         X509 *x509=NULL;
3085         EVP_PKEY *pkey=NULL;
3086         int i;
3087         unsigned long l;
3088
3089         if (s->state == SSL3_ST_CW_CERT_A)
3090                 {
3091                 if ((s->cert == NULL) ||
3092                         (s->cert->key->x509 == NULL) ||
3093                         (s->cert->key->privatekey == NULL))
3094                         s->state=SSL3_ST_CW_CERT_B;
3095                 else
3096                         s->state=SSL3_ST_CW_CERT_C;
3097                 }
3098
3099         /* We need to get a client cert */
3100         if (s->state == SSL3_ST_CW_CERT_B)
3101                 {
3102                 /* If we get an error, we need to
3103                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3104                  * We then get retied later */
3105                 i=0;
3106                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3107                 if (i < 0)
3108                         {
3109                         s->rwstate=SSL_X509_LOOKUP;
3110                         return(-1);
3111                         }
3112                 s->rwstate=SSL_NOTHING;
3113                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3114                         {
3115                         s->state=SSL3_ST_CW_CERT_B;
3116                         if (    !SSL_use_certificate(s,x509) ||
3117                                 !SSL_use_PrivateKey(s,pkey))
3118                                 i=0;
3119                         }
3120                 else if (i == 1)
3121                         {
3122                         i=0;
3123                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3124                         }
3125
3126                 if (x509 != NULL) X509_free(x509);
3127                 if (pkey != NULL) EVP_PKEY_free(pkey);
3128                 if (i == 0)
3129                         {
3130                         if (s->version == SSL3_VERSION)
3131                                 {
3132                                 s->s3->tmp.cert_req=0;
3133                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3134                                 return(1);
3135                                 }
3136                         else
3137                                 {
3138                                 s->s3->tmp.cert_req=2;
3139                                 }
3140                         }
3141
3142                 /* Ok, we have a cert */
3143                 s->state=SSL3_ST_CW_CERT_C;
3144                 }
3145
3146         if (s->state == SSL3_ST_CW_CERT_C)
3147                 {
3148                 s->state=SSL3_ST_CW_CERT_D;
3149                 l=ssl3_output_cert_chain(s,
3150                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3151                 s->init_num=(int)l;
3152                 s->init_off=0;
3153                 }
3154         /* SSL3_ST_CW_CERT_D */
3155         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3156         }
3157
3158 #define has_bits(i,m)   (((i)&(m)) == (m))
3159
3160 int ssl3_check_cert_and_algorithm(SSL *s)
3161         {
3162         int i,idx;
3163         long alg_k,alg_a;
3164         EVP_PKEY *pkey=NULL;
3165         SESS_CERT *sc;
3166 #ifndef OPENSSL_NO_RSA
3167         RSA *rsa;
3168 #endif
3169 #ifndef OPENSSL_NO_DH
3170         DH *dh;
3171 #endif
3172
3173         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3174         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3175
3176         /* we don't have a certificate */
3177         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3178                 return(1);
3179
3180         sc=s->session->sess_cert;
3181         if (sc == NULL)
3182                 {
3183                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3184                 goto err;
3185                 }
3186
3187 #ifndef OPENSSL_NO_RSA
3188         rsa=s->session->sess_cert->peer_rsa_tmp;
3189 #endif
3190 #ifndef OPENSSL_NO_DH
3191         dh=s->session->sess_cert->peer_dh_tmp;
3192 #endif
3193
3194         /* This is the passed certificate */
3195
3196         idx=sc->peer_cert_type;
3197 #ifndef OPENSSL_NO_ECDH
3198         if (idx == SSL_PKEY_ECC)
3199                 {
3200                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3201                                                                 s) == 0)
3202                         { /* check failed */
3203                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3204                         goto f_err;
3205                         }
3206                 else
3207                         {
3208                         return 1;
3209                         }
3210                 }
3211 #endif
3212         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3213         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3214         EVP_PKEY_free(pkey);
3215
3216
3217         /* Check that we have a certificate if we require one */
3218         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3219                 {
3220                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3221                 goto f_err;
3222                 }
3223 #ifndef OPENSSL_NO_DSA
3224         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3225                 {
3226                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3227                 goto f_err;
3228                 }
3229 #endif
3230 #ifndef OPENSSL_NO_RSA
3231         if ((alg_k & SSL_kRSA) &&
3232                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3233                 {
3234                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3235                 goto f_err;
3236                 }
3237 #endif
3238 #ifndef OPENSSL_NO_DH
3239         if ((alg_k & SSL_kEDH) &&
3240                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3241                 {
3242                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3243                 goto f_err;
3244                 }
3245         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3246                 {
3247                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3248                 goto f_err;
3249                 }
3250 #ifndef OPENSSL_NO_DSA
3251         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3252                 {
3253                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3254                 goto f_err;
3255                 }
3256 #endif
3257 #endif
3258
3259         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3260                 {
3261 #ifndef OPENSSL_NO_RSA
3262                 if (alg_k & SSL_kRSA)
3263                         {
3264                         if (rsa == NULL
3265                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3266                                 {
3267                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3268                                 goto f_err;
3269                                 }
3270                         }
3271                 else
3272 #endif
3273 #ifndef OPENSSL_NO_DH
3274                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3275                             {
3276                             if (dh == NULL
3277                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3278                                 {
3279                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3280                                 goto f_err;
3281                                 }
3282                         }
3283                 else
3284 #endif
3285                         {
3286                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3287                         goto f_err;
3288                         }
3289                 }
3290         return(1);
3291 f_err:
3292         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3293 err:
3294         return(0);
3295         }
3296
3297 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3298 int ssl3_send_next_proto(SSL *s)
3299         {
3300         unsigned int len, padding_len;
3301         unsigned char *d;
3302
3303         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3304                 {
3305                 len = s->next_proto_negotiated_len;
3306                 padding_len = 32 - ((len + 2) % 32);
3307                 d = (unsigned char *)s->init_buf->data;
3308                 d[4] = len;
3309                 memcpy(d + 5, s->next_proto_negotiated, len);
3310                 d[5 + len] = padding_len;
3311                 memset(d + 6 + len, 0, padding_len);
3312                 *(d++)=SSL3_MT_NEXT_PROTO;
3313                 l2n3(2 + len + padding_len, d);
3314                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3315                 s->init_num = 4 + 2 + len + padding_len;
3316                 s->init_off = 0;
3317                 }
3318
3319         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3320 }
3321 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3322
3323 /* Check to see if handshake is full or resumed. Usually this is just a
3324  * case of checking to see if a cache hit has occurred. In the case of
3325  * session tickets we have to check the next message to be sure.
3326  */
3327
3328 #ifndef OPENSSL_NO_TLSEXT
3329 int ssl3_check_finished(SSL *s)
3330         {
3331         int ok;
3332         long n;
3333         /* If we have no ticket it cannot be a resumed session. */
3334         if (!s->session->tlsext_tick)
3335                 return 1;
3336         /* this function is called when we really expect a Certificate
3337          * message, so permit appropriate message length */
3338         n=s->method->ssl_get_message(s,
3339                 SSL3_ST_CR_CERT_A,
3340                 SSL3_ST_CR_CERT_B,
3341                 -1,
3342                 s->max_cert_list,
3343                 &ok);
3344         if (!ok) return((int)n);
3345         s->s3->tmp.reuse_message = 1;
3346         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3347                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3348                 return 2;
3349
3350         return 1;
3351         }
3352 #endif
3353
3354 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3355         {
3356         int i = 0;
3357 #ifndef OPENSSL_NO_ENGINE
3358         if (s->ctx->client_cert_engine)
3359                 {
3360                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3361                                                 SSL_get_client_CA_list(s),
3362                                                 px509, ppkey, NULL, NULL, NULL);
3363                 if (i != 0)
3364                         return i;
3365                 }
3366 #endif
3367         if (s->ctx->client_cert_cb)
3368                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3369         return i;
3370         }