ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 s->state=SSL3_ST_CR_CERT_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_CR_CERT_A:
 314                 case SSL3_ST_CR_CERT_B:
 315 #ifndef OPENSSL_NO_TLSEXT
 316                         ret=ssl3_check_finished(s);
 317                         if (ret <= 0) goto end;
 318                         if (ret == 2)
 319                                 {
 320                                 s->hit = 1;
 321                                 if (s->tlsext_ticket_expected)
 322                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 323                                 else
 324                                         s->state=SSL3_ST_CR_FINISHED_A;
 325                                 s->init_num=0;
 326                                 break;
 327                                 }
 328 #endif
 329                         /* Check if it is anon DH/ECDH */
 330                         /* or PSK */
 331                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 332                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 333                                 {
 334                                 ret=ssl3_get_server_certificate(s);
 335                                 if (ret <= 0) goto end;
 336 #ifndef OPENSSL_NO_TLSEXT
 337                                 if (s->tlsext_status_expected)
 338                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 339                                 else
 340                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 341                                 }
 342                         else
 343                                 {
 344                                 skip = 1;
 345                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 346                                 }
 347 #else
 348                                 }
 349                         else
 350                                 skip=1;
 351
 352                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 353 #endif
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_KEY_EXCH_A:
 358                 case SSL3_ST_CR_KEY_EXCH_B:
 359                         ret=ssl3_get_key_exchange(s);
 360                         if (ret <= 0) goto end;
 361                         s->state=SSL3_ST_CR_CERT_REQ_A;
 362                         s->init_num=0;
 363
 364                         /* at this point we check that we have the
 365                          * required stuff from the server */
 366                         if (!ssl3_check_cert_and_algorithm(s))
 367                                 {
 368                                 ret= -1;
 369                                 goto end;
 370                                 }
 371                         break;
 372
 373                 case SSL3_ST_CR_CERT_REQ_A:
 374                 case SSL3_ST_CR_CERT_REQ_B:
 375                         ret=ssl3_get_certificate_request(s);
 376                         if (ret <= 0) goto end;
 377                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 378                         s->init_num=0;
 379                         break;
 380
 381                 case SSL3_ST_CR_SRVR_DONE_A:
 382                 case SSL3_ST_CR_SRVR_DONE_B:
 383                         ret=ssl3_get_server_done(s);
 384                         if (ret <= 0) goto end;
 385 #ifndef OPENSSL_NO_SRP
 386                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 387                                 {
 388                                 if ((ret = SRP_Calc_A_param(s))<=0)
 389                                         {
 390                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 391                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 392                                         goto end;
 393                                         }
 394                                 }
 395 #endif
 396                         if (s->s3->tmp.cert_req)
 397                                 s->state=SSL3_ST_CW_CERT_A;
 398                         else
 399                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 400                         s->init_num=0;
 401
 402                         break;
 403
 404                 case SSL3_ST_CW_CERT_A:
 405                 case SSL3_ST_CW_CERT_B:
 406                 case SSL3_ST_CW_CERT_C:
 407                 case SSL3_ST_CW_CERT_D:
 408                         ret=ssl3_send_client_certificate(s);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_CW_KEY_EXCH_A:
 415                 case SSL3_ST_CW_KEY_EXCH_B:
 416                         ret=ssl3_send_client_key_exchange(s);
 417                         if (ret <= 0) goto end;
 418                         /* EAY EAY EAY need to check for DH fix cert
 419                          * sent back */
 420                         /* For TLS, cert_req is set to 2, so a cert chain
 421                          * of nothing is sent, but no verify packet is sent */
 422                         /* XXX: For now, we do not support client
 423                          * authentication in ECDH cipher suites with
 424                          * ECDH (rather than ECDSA) certificates.
 425                          * We need to skip the certificate verify
 426                          * message when client's ECDH public key is sent
 427                          * inside the client certificate.
 428                          */
 429                         if (s->s3->tmp.cert_req == 1)
 430                                 {
 431                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 432                                 }
 433                         else
 434                                 {
 435                                 s->state=SSL3_ST_CW_CHANGE_A;
 436                                 s->s3->change_cipher_spec=0;
 437                                 }
 438                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 439                                 {
 440                                 s->state=SSL3_ST_CW_CHANGE_A;
 441                                 s->s3->change_cipher_spec=0;
 442                                 }
 443
 444                         s->init_num=0;
 445                         break;
 446
 447                 case SSL3_ST_CW_CERT_VRFY_A:
 448                 case SSL3_ST_CW_CERT_VRFY_B:
 449                         ret=ssl3_send_client_verify(s);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_CHANGE_A;
 452                         s->init_num=0;
 453                         s->s3->change_cipher_spec=0;
 454                         break;
 455
 456                 case SSL3_ST_CW_CHANGE_A:
 457                 case SSL3_ST_CW_CHANGE_B:
 458                         ret=ssl3_send_change_cipher_spec(s,
 459                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 460                         if (ret <= 0) goto end;
 461
 462 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 463                         s->state=SSL3_ST_CW_FINISHED_A;
 464 #else
 465                         if (s->s3->next_proto_neg_seen)
 466                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 467                         else
 468                                 s->state=SSL3_ST_CW_FINISHED_A;
 469 #endif
 470                         s->init_num=0;
 471
 472                         s->session->cipher=s->s3->tmp.new_cipher;
 473 #ifdef OPENSSL_NO_COMP
 474                         s->session->compress_meth=0;
 475 #else
 476                         if (s->s3->tmp.new_compression == NULL)
 477                                 s->session->compress_meth=0;
 478                         else
 479                                 s->session->compress_meth=
 480                                         s->s3->tmp.new_compression->id;
 481 #endif
 482                         if (!s->method->ssl3_enc->setup_key_block(s))
 483                                 {
 484                                 ret= -1;
 485                                 goto end;
 486                                 }
 487
 488                         if (!s->method->ssl3_enc->change_cipher_state(s,
 489                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 490                                 {
 491                                 ret= -1;
 492                                 goto end;
 493                                 }
 494
 495                         break;
 496
 497 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 498                 case SSL3_ST_CW_NEXT_PROTO_A:
 499                 case SSL3_ST_CW_NEXT_PROTO_B:
 500                         ret=ssl3_send_next_proto(s);
 501                         if (ret <= 0) goto end;
 502                         s->state=SSL3_ST_CW_FINISHED_A;
 503                         break;
 504 #endif
 505
 506                 case SSL3_ST_CW_FINISHED_A:
 507                 case SSL3_ST_CW_FINISHED_B:
 508                         ret=ssl3_send_finished(s,
 509                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 510                                 s->method->ssl3_enc->client_finished_label,
 511                                 s->method->ssl3_enc->client_finished_label_len);
 512                         if (ret <= 0) goto end;
 513                         s->state=SSL3_ST_CW_FLUSH;
 514
 515                         /* clear flags */
 516                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 517                         if (s->hit)
 518                                 {
 519                                 s->s3->tmp.next_state=SSL_ST_OK;
 520                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 521                                         {
 522                                         s->state=SSL_ST_OK;
 523                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 524                                         s->s3->delay_buf_pop_ret=0;
 525                                         }
 526                                 }
 527                         else
 528                                 {
 529 #ifndef OPENSSL_NO_TLSEXT
 530                                 /* Allow NewSessionTicket if ticket expected */
 531                                 if (s->tlsext_ticket_expected)
 532                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 533                                 else
 534 #endif
 535
 536                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 537                                 }
 538                         s->init_num=0;
 539                         break;
 540
 541 #ifndef OPENSSL_NO_TLSEXT
 542                 case SSL3_ST_CR_SESSION_TICKET_A:
 543                 case SSL3_ST_CR_SESSION_TICKET_B:
 544                         ret=ssl3_get_new_session_ticket(s);
 545                         if (ret <= 0) goto end;
 546                         s->state=SSL3_ST_CR_FINISHED_A;
 547                         s->init_num=0;
 548                 break;
 549
 550                 case SSL3_ST_CR_CERT_STATUS_A:
 551                 case SSL3_ST_CR_CERT_STATUS_B:
 552                         ret=ssl3_get_cert_status(s);
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 555                         s->init_num=0;
 556                 break;
 557 #endif
 558
 559                 case SSL3_ST_CR_FINISHED_A:
 560                 case SSL3_ST_CR_FINISHED_B:
 561
 562                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 563                                 SSL3_ST_CR_FINISHED_B);
 564                         if (ret <= 0) goto end;
 565
 566                         if (s->hit)
 567                                 s->state=SSL3_ST_CW_CHANGE_A;
 568                         else
 569                                 s->state=SSL_ST_OK;
 570                         s->init_num=0;
 571                         break;
 572
 573                 case SSL3_ST_CW_FLUSH:
 574                         s->rwstate=SSL_WRITING;
 575                         if (BIO_flush(s->wbio) <= 0)
 576                                 {
 577                                 ret= -1;
 578                                 goto end;
 579                                 }
 580                         s->rwstate=SSL_NOTHING;
 581                         s->state=s->s3->tmp.next_state;
 582                         break;
 583
 584                 case SSL_ST_OK:
 585                         /* clean a few things up */
 586                         ssl3_cleanup_key_block(s);
 587
 588                         if (s->init_buf != NULL)
 589                                 {
 590                                 BUF_MEM_free(s->init_buf);
 591                                 s->init_buf=NULL;
 592                                 }
 593
 594                         /* If we are not 'joining' the last two packets,
 595                          * remove the buffering now */
 596                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 597                                 ssl_free_wbio_buffer(s);
 598                         /* else do it later in ssl3_write */
 599
 600                         s->init_num=0;
 601                         s->renegotiate=0;
 602                         s->new_session=0;
 603
 604                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 605                         if (s->hit) s->ctx->stats.sess_hit++;
 606
 607                         ret=1;
 608                         /* s->server=0; */
 609                         s->handshake_func=ssl3_connect;
 610                         s->ctx->stats.sess_connect_good++;
 611
 612                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 613
 614                         goto end;
 615                         /* break; */
 616
 617                 default:
 618                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 619                         ret= -1;
 620                         goto end;
 621                         /* break; */
 622                         }
 623
 624                 /* did we do anything */
 625                 if (!s->s3->tmp.reuse_message && !skip)
 626                         {
 627                         if (s->debug)
 628                                 {
 629                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 630                                         goto end;
 631                                 }
 632
 633                         if ((cb != NULL) && (s->state != state))
 634                                 {
 635                                 new_state=s->state;
 636                                 s->state=state;
 637                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 638                                 s->state=new_state;
 639                                 }
 640                         }
 641                 skip=0;
 642                 }
 643 end:
 644         s->in_handshake--;
 645         if (buf != NULL)
 646                 BUF_MEM_free(buf);
 647         if (cb != NULL)
 648                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 649         return(ret);
 650         }
 651
 652
 653 int ssl3_client_hello(SSL *s)
 654         {
 655         unsigned char *buf;
 656         unsigned char *p,*d;
 657         int i;
 658         unsigned long l;
 659 #ifndef OPENSSL_NO_COMP
 660         int j;
 661         SSL_COMP *comp;
 662 #endif
 663
 664         buf=(unsigned char *)s->init_buf->data;
 665         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 666                 {
 667                 SSL_SESSION *sess = s->session;
 668                 if ((sess == NULL) ||
 669                         (sess->ssl_version != s->version) ||
 670 #ifdef OPENSSL_NO_TLSEXT
 671                         !sess->session_id_length ||
 672 #else
 673                         (!sess->session_id_length && !sess->tlsext_tick) ||
 674 #endif
 675                         (sess->not_resumable))
 676                         {
 677                         if (!ssl_get_new_session(s,0))
 678                                 goto err;
 679                         }
 680                 /* else use the pre-loaded session */
 681
 682                 p=s->s3->client_random;
 683                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE) <= 0)
 684                         goto err;
 685
 686                 /* Do the message type and length last */
 687                 d=p= &(buf[4]);
 688
 689                 /* version indicates the negotiated version: for example from
 690                  * an SSLv2/v3 compatible client hello). The client_version
 691                  * field is the maximum version we permit and it is also
 692                  * used in RSA encrypted premaster secrets. Some servers can
 693                  * choke if we initially report a higher version then
 694                  * renegotiate to a lower one in the premaster secret. This
 695                  * didn't happen with TLS 1.0 as most servers supported it
 696                  * but it can with TLS 1.1 or later if the server only supports
 697                  * 1.0.
 698                  *
 699                  * Possible scenario with previous logic:
 700                  *      1. Client hello indicates TLS 1.2
 701                  *      2. Server hello says TLS 1.0
 702                  *      3. RSA encrypted premaster secret uses 1.2.
 703                  *      4. Handhaked proceeds using TLS 1.0.
 704                  *      5. Server sends hello request to renegotiate.
 705                  *      6. Client hello indicates TLS v1.0 as we now
 706                  *         know that is maximum server supports.
 707                  *      7. Server chokes on RSA encrypted premaster secret
 708                  *         containing version 1.0.
 709                  *
 710                  * For interoperability it should be OK to always use the
 711                  * maximum version we support in client hello and then rely
 712                  * on the checking of version to ensure the servers isn't
 713                  * being inconsistent: for example initially negotiating with
 714                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 715                  * client_version in client hello and not resetting it to
 716                  * the negotiated version.
 717                  */
 718 #if 0
 719                 *(p++)=s->version>>8;
 720                 *(p++)=s->version&0xff;
 721                 s->client_version=s->version;
 722 #else
 723                 *(p++)=s->client_version>>8;
 724                 *(p++)=s->client_version&0xff;
 725 #endif
 726
 727                 /* Random stuff */
 728                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 729                 p+=SSL3_RANDOM_SIZE;
 730
 731                 /* Session ID */
 732                 if (s->new_session)
 733                         i=0;
 734                 else
 735                         i=s->session->session_id_length;
 736                 *(p++)=i;
 737                 if (i != 0)
 738                         {
 739                         if (i > (int)sizeof(s->session->session_id))
 740                                 {
 741                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 742                                 goto err;
 743                                 }
 744                         memcpy(p,s->session->session_id,i);
 745                         p+=i;
 746                         }
 747
 748                 /* Ciphers supported */
 749                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 750                 if (i == 0)
 751                         {
 752                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 753                         goto err;
 754                         }
 755 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 756                         /* Some servers hang if client hello > 256 bytes
 757                          * as hack workaround chop number of supported ciphers
 758                          * to keep it well below this if we use TLS v1.2
 759                          */
 760                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 761                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 762                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 763 #endif
 764                 s2n(i,p);
 765                 p+=i;
 766
 767                 /* COMPRESSION */
 768 #ifdef OPENSSL_NO_COMP
 769                 *(p++)=1;
 770 #else
 771
 772                 if ((s->options & SSL_OP_NO_COMPRESSION)
 773                                         || !s->ctx->comp_methods)
 774                         j=0;
 775                 else
 776                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 777                 *(p++)=1+j;
 778                 for (i=0; i<j; i++)
 779                         {
 780                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 781                         *(p++)=comp->id;
 782                         }
 783 #endif
 784                 *(p++)=0; /* Add the NULL method */
 785
 786 #ifndef OPENSSL_NO_TLSEXT
 787                 /* TLS extensions*/
 788                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 789                         {
 790                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 791                         goto err;
 792                         }
 793                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 794                         {
 795                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 796                         goto err;
 797                         }
 798 #endif
 799
 800                 l=(p-d);
 801                 d=buf;
 802                 *(d++)=SSL3_MT_CLIENT_HELLO;
 803                 l2n3(l,d);
 804
 805                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 806                 /* number of bytes to write */
 807                 s->init_num=p-buf;
 808                 s->init_off=0;
 809                 }
 810
 811         /* SSL3_ST_CW_CLNT_HELLO_B */
 812         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 813 err:
 814         return(-1);
 815         }
 816
 817 int ssl3_get_server_hello(SSL *s)
 818         {
 819         STACK_OF(SSL_CIPHER) *sk;
 820         const SSL_CIPHER *c;
 821         unsigned char *p,*d;
 822         int i,al,ok;
 823         unsigned int j;
 824         long n;
 825 #ifndef OPENSSL_NO_COMP
 826         SSL_COMP *comp;
 827 #endif
 828
 829         n=s->method->ssl_get_message(s,
 830                 SSL3_ST_CR_SRVR_HELLO_A,
 831                 SSL3_ST_CR_SRVR_HELLO_B,
 832                 -1,
 833                 20000, /* ?? */
 834                 &ok);
 835
 836         if (!ok) return((int)n);
 837
 838         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 839                 {
 840                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 841                         {
 842                         if ( s->d1->send_cookie == 0)
 843                                 {
 844                                 s->s3->tmp.reuse_message = 1;
 845                                 return 1;
 846                                 }
 847                         else /* already sent a cookie */
 848                                 {
 849                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 850                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 851                                 goto f_err;
 852                                 }
 853                         }
 854                 }
 855
 856         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 857                 {
 858                 al=SSL_AD_UNEXPECTED_MESSAGE;
 859                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 860                 goto f_err;
 861                 }
 862
 863         d=p=(unsigned char *)s->init_msg;
 864
 865         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 866                 {
 867                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 868                 s->version=(s->version&0xff00)|p[1];
 869                 al=SSL_AD_PROTOCOL_VERSION;
 870                 goto f_err;
 871                 }
 872         p+=2;
 873
 874         /* load the server hello data */
 875         /* load the server random */
 876         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 877         p+=SSL3_RANDOM_SIZE;
 878
 879         /* get the session-id */
 880         j= *(p++);
 881
 882         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 883                 {
 884                 al=SSL_AD_ILLEGAL_PARAMETER;
 885                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 886                 goto f_err;
 887                 }
 888
 889 #ifndef OPENSSL_NO_TLSEXT
 890         /* check if we want to resume the session based on external pre-shared secret */
 891         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 892                 {
 893                 SSL_CIPHER *pref_cipher=NULL;
 894                 s->session->master_key_length=sizeof(s->session->master_key);
 895                 if (s->tls_session_secret_cb(s, s->session->master_key,
 896                                              &s->session->master_key_length,
 897                                              NULL, &pref_cipher,
 898                                              s->tls_session_secret_cb_arg))
 899                         {
 900                         s->session->cipher = pref_cipher ?
 901                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 902                         }
 903                 }
 904 #endif /* OPENSSL_NO_TLSEXT */
 905
 906         if (j != 0 && j == s->session->session_id_length
 907             && memcmp(p,s->session->session_id,j) == 0)
 908             {
 909             if(s->sid_ctx_length != s->session->sid_ctx_length
 910                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 911                 {
 912                 /* actually a client application bug */
 913                 al=SSL_AD_ILLEGAL_PARAMETER;
 914                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 915                 goto f_err;
 916                 }
 917             s->hit=1;
 918             }
 919         else    /* a miss or crap from the other end */
 920                 {
 921                 /* If we were trying for session-id reuse, make a new
 922                  * SSL_SESSION so we don't stuff up other people */
 923                 s->hit=0;
 924                 if (s->session->session_id_length > 0)
 925                         {
 926                         if (!ssl_get_new_session(s,0))
 927                                 {
 928                                 al=SSL_AD_INTERNAL_ERROR;
 929                                 goto f_err;
 930                                 }
 931                         }
 932                 s->session->session_id_length=j;
 933                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 934                 }
 935         p+=j;
 936         c=ssl_get_cipher_by_char(s,p);
 937         if (c == NULL)
 938                 {
 939                 /* unknown cipher */
 940                 al=SSL_AD_ILLEGAL_PARAMETER;
 941                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 942                 goto f_err;
 943                 }
 944         /* TLS v1.2 only ciphersuites require v1.2 or later */
 945         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 946                 (TLS1_get_version(s) < TLS1_2_VERSION))
 947                 {
 948                 al=SSL_AD_ILLEGAL_PARAMETER;
 949                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 950                 goto f_err;
 951                 }
 952         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 953
 954         sk=ssl_get_ciphers_by_id(s);
 955         i=sk_SSL_CIPHER_find(sk,c);
 956         if (i < 0)
 957                 {
 958                 /* we did not say we would use this cipher */
 959                 al=SSL_AD_ILLEGAL_PARAMETER;
 960                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 961                 goto f_err;
 962                 }
 963
 964         /* Depending on the session caching (internal/external), the cipher
 965            and/or cipher_id values may not be set. Make sure that
 966            cipher_id is set and use it for comparison. */
 967         if (s->session->cipher)
 968                 s->session->cipher_id = s->session->cipher->id;
 969         if (s->hit && (s->session->cipher_id != c->id))
 970                 {
 971 /* Workaround is now obsolete */
 972 #if 0
 973                 if (!(s->options &
 974                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 975 #endif
 976                         {
 977                         al=SSL_AD_ILLEGAL_PARAMETER;
 978                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 979                         goto f_err;
 980                         }
 981                 }
 982         s->s3->tmp.new_cipher=c;
 983         /* Don't digest cached records if TLS v1.2: we may need them for
 984          * client authentication.
 985          */
 986         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 987                 {
 988                 al = SSL_AD_INTERNAL_ERROR;
 989                 goto f_err;
 990                 }
 991         /* lets get the compression algorithm */
 992         /* COMPRESSION */
 993 #ifdef OPENSSL_NO_COMP
 994         if (*(p++) != 0)
 995                 {
 996                 al=SSL_AD_ILLEGAL_PARAMETER;
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 998                 goto f_err;
 999                 }
1000         /* If compression is disabled we'd better not try to resume a session
1001          * using compression.
1002          */
1003         if (s->session->compress_meth != 0)
1004                 {
1005                 al=SSL_AD_INTERNAL_ERROR;
1006                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1007                 goto f_err;
1008                 }
1009 #else
1010         j= *(p++);
1011         if (s->hit && j != s->session->compress_meth)
1012                 {
1013                 al=SSL_AD_ILLEGAL_PARAMETER;
1014                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1015                 goto f_err;
1016                 }
1017         if (j == 0)
1018                 comp=NULL;
1019         else if (s->options & SSL_OP_NO_COMPRESSION)
1020                 {
1021                 al=SSL_AD_ILLEGAL_PARAMETER;
1022                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1023                 goto f_err;
1024                 }
1025         else
1026                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1027
1028         if ((j != 0) && (comp == NULL))
1029                 {
1030                 al=SSL_AD_ILLEGAL_PARAMETER;
1031                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1032                 goto f_err;
1033                 }
1034         else
1035                 {
1036                 s->s3->tmp.new_compression=comp;
1037                 }
1038 #endif
1039
1040 #ifndef OPENSSL_NO_TLSEXT
1041         /* TLS extensions*/
1042         if (s->version >= SSL3_VERSION)
1043                 {
1044                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1045                         {
1046                         /* 'al' set by ssl_parse_serverhello_tlsext */
1047                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1048                         goto f_err;
1049                         }
1050                 if (ssl_check_serverhello_tlsext(s) <= 0)
1051                         {
1052                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1053                                 goto err;
1054                         }
1055                 }
1056 #endif
1057
1058         if (p != (d+n))
1059                 {
1060                 /* wrong packet length */
1061                 al=SSL_AD_DECODE_ERROR;
1062                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1063                 goto f_err;
1064                 }
1065
1066         return(1);
1067 f_err:
1068         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1069 err:
1070         return(-1);
1071         }
1072
1073 int ssl3_get_server_certificate(SSL *s)
1074         {
1075         int al,i,ok,ret= -1;
1076         unsigned long n,nc,llen,l;
1077         X509 *x=NULL;
1078         const unsigned char *q,*p;
1079         unsigned char *d;
1080         STACK_OF(X509) *sk=NULL;
1081         SESS_CERT *sc;
1082         EVP_PKEY *pkey=NULL;
1083         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1084
1085         n=s->method->ssl_get_message(s,
1086                 SSL3_ST_CR_CERT_A,
1087                 SSL3_ST_CR_CERT_B,
1088                 -1,
1089                 s->max_cert_list,
1090                 &ok);
1091
1092         if (!ok) return((int)n);
1093
1094         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1095                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1096                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1097                 {
1098                 s->s3->tmp.reuse_message=1;
1099                 return(1);
1100                 }
1101
1102         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1103                 {
1104                 al=SSL_AD_UNEXPECTED_MESSAGE;
1105                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1106                 goto f_err;
1107                 }
1108         p=d=(unsigned char *)s->init_msg;
1109
1110         if ((sk=sk_X509_new_null()) == NULL)
1111                 {
1112                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1113                 goto err;
1114                 }
1115
1116         n2l3(p,llen);
1117         if (llen+3 != n)
1118                 {
1119                 al=SSL_AD_DECODE_ERROR;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1121                 goto f_err;
1122                 }
1123         for (nc=0; nc<llen; )
1124                 {
1125                 n2l3(p,l);
1126                 if ((l+nc+3) > llen)
1127                         {
1128                         al=SSL_AD_DECODE_ERROR;
1129                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1130                         goto f_err;
1131                         }
1132
1133                 q=p;
1134                 x=d2i_X509(NULL,&q,l);
1135                 if (x == NULL)
1136                         {
1137                         al=SSL_AD_BAD_CERTIFICATE;
1138                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1139                         goto f_err;
1140                         }
1141                 if (q != (p+l))
1142                         {
1143                         al=SSL_AD_DECODE_ERROR;
1144                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1145                         goto f_err;
1146                         }
1147                 if (!sk_X509_push(sk,x))
1148                         {
1149                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1150                         goto err;
1151                         }
1152                 x=NULL;
1153                 nc+=l+3;
1154                 p=q;
1155                 }
1156
1157         i=ssl_verify_cert_chain(s,sk);
1158         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1159 #ifndef OPENSSL_NO_KRB5
1160             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1161                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1162 #endif /* OPENSSL_NO_KRB5 */
1163                 )
1164                 {
1165                 al=ssl_verify_alarm_type(s->verify_result);
1166                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1167                 goto f_err;
1168                 }
1169         ERR_clear_error(); /* but we keep s->verify_result */
1170
1171         sc=ssl_sess_cert_new();
1172         if (sc == NULL) goto err;
1173
1174         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1175         s->session->sess_cert=sc;
1176
1177         sc->cert_chain=sk;
1178         /* Inconsistency alert: cert_chain does include the peer's
1179          * certificate, which we don't include in s3_srvr.c */
1180         x=sk_X509_value(sk,0);
1181         sk=NULL;
1182         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1183
1184         pkey=X509_get_pubkey(x);
1185
1186         /* VRS: allow null cert if auth == KRB5 */
1187         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1188                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1189                     ? 0 : 1;
1190
1191 #ifdef KSSL_DEBUG
1192         printf("pkey,x = %p, %p\n", pkey,x);
1193         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1194         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1195                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1196 #endif    /* KSSL_DEBUG */
1197
1198         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1199                 {
1200                 x=NULL;
1201                 al=SSL3_AL_FATAL;
1202                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1203                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1204                 goto f_err;
1205                 }
1206
1207         i=ssl_cert_type(x,pkey);
1208         if (need_cert && i < 0)
1209                 {
1210                 x=NULL;
1211                 al=SSL3_AL_FATAL;
1212                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1213                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1214                 goto f_err;
1215                 }
1216
1217         if (need_cert)
1218                 {
1219                 sc->peer_cert_type=i;
1220                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1221                 /* Why would the following ever happen?
1222                  * We just created sc a couple of lines ago. */
1223                 if (sc->peer_pkeys[i].x509 != NULL)
1224                         X509_free(sc->peer_pkeys[i].x509);
1225                 sc->peer_pkeys[i].x509=x;
1226                 sc->peer_key= &(sc->peer_pkeys[i]);
1227
1228                 if (s->session->peer != NULL)
1229                         X509_free(s->session->peer);
1230                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1231                 s->session->peer=x;
1232                 }
1233         else
1234                 {
1235                 sc->peer_cert_type=i;
1236                 sc->peer_key= NULL;
1237
1238                 if (s->session->peer != NULL)
1239                         X509_free(s->session->peer);
1240                 s->session->peer=NULL;
1241                 }
1242         s->session->verify_result = s->verify_result;
1243
1244         x=NULL;
1245         ret=1;
1246
1247         if (0)
1248                 {
1249 f_err:
1250                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1251                 }
1252 err:
1253         EVP_PKEY_free(pkey);
1254         X509_free(x);
1255         sk_X509_pop_free(sk,X509_free);
1256         return(ret);
1257         }
1258
1259 int ssl3_get_key_exchange(SSL *s)
1260         {
1261 #ifndef OPENSSL_NO_RSA
1262         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1263 #endif
1264         EVP_MD_CTX md_ctx;
1265         unsigned char *param,*p;
1266         int al,i,j,param_len,ok;
1267         long n,alg_k,alg_a;
1268         EVP_PKEY *pkey=NULL;
1269         const EVP_MD *md = NULL;
1270 #ifndef OPENSSL_NO_RSA
1271         RSA *rsa=NULL;
1272 #endif
1273 #ifndef OPENSSL_NO_DH
1274         DH *dh=NULL;
1275 #endif
1276 #ifndef OPENSSL_NO_ECDH
1277         EC_KEY *ecdh = NULL;
1278         BN_CTX *bn_ctx = NULL;
1279         EC_POINT *srvr_ecpoint = NULL;
1280         int curve_nid = 0;
1281         int encoded_pt_len = 0;
1282 #endif
1283
1284         /* use same message size as in ssl3_get_certificate_request()
1285          * as ServerKeyExchange message may be skipped */
1286         n=s->method->ssl_get_message(s,
1287                 SSL3_ST_CR_KEY_EXCH_A,
1288                 SSL3_ST_CR_KEY_EXCH_B,
1289                 -1,
1290                 s->max_cert_list,
1291                 &ok);
1292         if (!ok) return((int)n);
1293
1294         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1295                 {
1296 #ifndef OPENSSL_NO_PSK
1297                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1298                    omitted if no identity hint is sent. Set
1299                    session->sess_cert anyway to avoid problems
1300                    later.*/
1301                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1302                         {
1303                         s->session->sess_cert=ssl_sess_cert_new();
1304                         if (s->ctx->psk_identity_hint)
1305                                 OPENSSL_free(s->ctx->psk_identity_hint);
1306                         s->ctx->psk_identity_hint = NULL;
1307                         }
1308 #endif
1309                 s->s3->tmp.reuse_message=1;
1310                 return(1);
1311                 }
1312
1313         param=p=(unsigned char *)s->init_msg;
1314         if (s->session->sess_cert != NULL)
1315                 {
1316 #ifndef OPENSSL_NO_RSA
1317                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1318                         {
1319                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1320                         s->session->sess_cert->peer_rsa_tmp=NULL;
1321                         }
1322 #endif
1323 #ifndef OPENSSL_NO_DH
1324                 if (s->session->sess_cert->peer_dh_tmp)
1325                         {
1326                         DH_free(s->session->sess_cert->peer_dh_tmp);
1327                         s->session->sess_cert->peer_dh_tmp=NULL;
1328                         }
1329 #endif
1330 #ifndef OPENSSL_NO_ECDH
1331                 if (s->session->sess_cert->peer_ecdh_tmp)
1332                         {
1333                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1334                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1335                         }
1336 #endif
1337                 }
1338         else
1339                 {
1340                 s->session->sess_cert=ssl_sess_cert_new();
1341                 }
1342
1343         param_len=0;
1344         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1345         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1346         EVP_MD_CTX_init(&md_ctx);
1347
1348 #ifndef OPENSSL_NO_PSK
1349         if (alg_k & SSL_kPSK)
1350                 {
1351                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1352
1353                 al=SSL_AD_HANDSHAKE_FAILURE;
1354                 n2s(p,i);
1355                 param_len=i+2;
1356                 /* Store PSK identity hint for later use, hint is used
1357                  * in ssl3_send_client_key_exchange.  Assume that the
1358                  * maximum length of a PSK identity hint can be as
1359                  * long as the maximum length of a PSK identity. */
1360                 if (i > PSK_MAX_IDENTITY_LEN)
1361                         {
1362                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1363                                 SSL_R_DATA_LENGTH_TOO_LONG);
1364                         goto f_err;
1365                         }
1366                 if (param_len > n)
1367                         {
1368                         al=SSL_AD_DECODE_ERROR;
1369                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1370                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1371                         goto f_err;
1372                         }
1373                 /* If received PSK identity hint contains NULL
1374                  * characters, the hint is truncated from the first
1375                  * NULL. p may not be ending with NULL, so create a
1376                  * NULL-terminated string. */
1377                 memcpy(tmp_id_hint, p, i);
1378                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1379                 if (s->ctx->psk_identity_hint != NULL)
1380                         OPENSSL_free(s->ctx->psk_identity_hint);
1381                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1382                 if (s->ctx->psk_identity_hint == NULL)
1383                         {
1384                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1385                         goto f_err;
1386                         }
1387
1388                 p+=i;
1389                 n-=param_len;
1390                 }
1391         else
1392 #endif /* !OPENSSL_NO_PSK */
1393 #ifndef OPENSSL_NO_SRP
1394         if (alg_k & SSL_kSRP)
1395                 {
1396                 n2s(p,i);
1397                 param_len=i+2;
1398                 if (param_len > n)
1399                         {
1400                         al=SSL_AD_DECODE_ERROR;
1401                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1402                         goto f_err;
1403                         }
1404                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1405                         {
1406                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1407                         goto err;
1408                         }
1409                 p+=i;
1410
1411                 n2s(p,i);
1412                 param_len+=i+2;
1413                 if (param_len > n)
1414                         {
1415                         al=SSL_AD_DECODE_ERROR;
1416                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1417                         goto f_err;
1418                         }
1419                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1420                         {
1421                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1422                         goto err;
1423                         }
1424                 p+=i;
1425
1426                 i = (unsigned int)(p[0]);
1427                 p++;
1428                 param_len+=i+1;
1429                 if (param_len > n)
1430                         {
1431                         al=SSL_AD_DECODE_ERROR;
1432                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1433                         goto f_err;
1434                         }
1435                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1436                         {
1437                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1438                         goto err;
1439                         }
1440                 p+=i;
1441
1442                 n2s(p,i);
1443                 param_len+=i+2;
1444                 if (param_len > n)
1445                         {
1446                         al=SSL_AD_DECODE_ERROR;
1447                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1448                         goto f_err;
1449                         }
1450                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1451                         {
1452                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1453                         goto err;
1454                         }
1455                 p+=i;
1456                 n-=param_len;
1457
1458 /* We must check if there is a certificate */
1459 #ifndef OPENSSL_NO_RSA
1460                 if (alg_a & SSL_aRSA)
1461                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1462 #else
1463                 if (0)
1464                         ;
1465 #endif
1466 #ifndef OPENSSL_NO_DSA
1467                 else if (alg_a & SSL_aDSS)
1468                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1469 #endif
1470                 }
1471         else
1472 #endif /* !OPENSSL_NO_SRP */
1473 #ifndef OPENSSL_NO_RSA
1474         if (alg_k & SSL_kRSA)
1475                 {
1476                 if ((rsa=RSA_new()) == NULL)
1477                         {
1478                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1479                         goto err;
1480                         }
1481                 n2s(p,i);
1482                 param_len=i+2;
1483                 if (param_len > n)
1484                         {
1485                         al=SSL_AD_DECODE_ERROR;
1486                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1487                         goto f_err;
1488                         }
1489                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1490                         {
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1492                         goto err;
1493                         }
1494                 p+=i;
1495
1496                 n2s(p,i);
1497                 param_len+=i+2;
1498                 if (param_len > n)
1499                         {
1500                         al=SSL_AD_DECODE_ERROR;
1501                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1502                         goto f_err;
1503                         }
1504                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1507                         goto err;
1508                         }
1509                 p+=i;
1510                 n-=param_len;
1511
1512                 /* this should be because we are using an export cipher */
1513                 if (alg_a & SSL_aRSA)
1514                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1515                 else
1516                         {
1517                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1518                         goto err;
1519                         }
1520                 s->session->sess_cert->peer_rsa_tmp=rsa;
1521                 rsa=NULL;
1522                 }
1523 #else /* OPENSSL_NO_RSA */
1524         if (0)
1525                 ;
1526 #endif
1527 #ifndef OPENSSL_NO_DH
1528         else if (alg_k & SSL_kEDH)
1529                 {
1530                 if ((dh=DH_new()) == NULL)
1531                         {
1532                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1533                         goto err;
1534                         }
1535                 n2s(p,i);
1536                 param_len=i+2;
1537                 if (param_len > n)
1538                         {
1539                         al=SSL_AD_DECODE_ERROR;
1540                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1541                         goto f_err;
1542                         }
1543                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1544                         {
1545                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1546                         goto err;
1547                         }
1548                 p+=i;
1549
1550                 n2s(p,i);
1551                 param_len+=i+2;
1552                 if (param_len > n)
1553                         {
1554                         al=SSL_AD_DECODE_ERROR;
1555                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1556                         goto f_err;
1557                         }
1558                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1559                         {
1560                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1561                         goto err;
1562                         }
1563                 p+=i;
1564
1565                 n2s(p,i);
1566                 param_len+=i+2;
1567                 if (param_len > n)
1568                         {
1569                         al=SSL_AD_DECODE_ERROR;
1570                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1571                         goto f_err;
1572                         }
1573                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1574                         {
1575                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1576                         goto err;
1577                         }
1578                 p+=i;
1579                 n-=param_len;
1580
1581 #ifndef OPENSSL_NO_RSA
1582                 if (alg_a & SSL_aRSA)
1583                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1584 #else
1585                 if (0)
1586                         ;
1587 #endif
1588 #ifndef OPENSSL_NO_DSA
1589                 else if (alg_a & SSL_aDSS)
1590                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1591 #endif
1592                 /* else anonymous DH, so no certificate or pkey. */
1593
1594                 s->session->sess_cert->peer_dh_tmp=dh;
1595                 dh=NULL;
1596                 }
1597         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1598                 {
1599                 al=SSL_AD_ILLEGAL_PARAMETER;
1600                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1601                 goto f_err;
1602                 }
1603 #endif /* !OPENSSL_NO_DH */
1604
1605 #ifndef OPENSSL_NO_ECDH
1606         else if (alg_k & SSL_kEECDH)
1607                 {
1608                 EC_GROUP *ngroup;
1609                 const EC_GROUP *group;
1610
1611                 if ((ecdh=EC_KEY_new()) == NULL)
1612                         {
1613                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1614                         goto err;
1615                         }
1616
1617                 /* Extract elliptic curve parameters and the
1618                  * server's ephemeral ECDH public key.
1619                  * Keep accumulating lengths of various components in
1620                  * param_len and make sure it never exceeds n.
1621                  */
1622
1623                 /* XXX: For now we only support named (not generic) curves
1624                  * and the ECParameters in this case is just three bytes.
1625                  */
1626                 param_len=3;
1627                 if ((param_len > n) ||
1628                     (*p != NAMED_CURVE_TYPE) ||
1629                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1630                         {
1631                         al=SSL_AD_INTERNAL_ERROR;
1632                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1633                         goto f_err;
1634                         }
1635
1636                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1637                 if (ngroup == NULL)
1638                         {
1639                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1640                         goto err;
1641                         }
1642                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1643                         {
1644                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1645                         goto err;
1646                         }
1647                 EC_GROUP_free(ngroup);
1648
1649                 group = EC_KEY_get0_group(ecdh);
1650
1651                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1652                     (EC_GROUP_get_degree(group) > 163))
1653                         {
1654                         al=SSL_AD_EXPORT_RESTRICTION;
1655                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1656                         goto f_err;
1657                         }
1658
1659                 p+=3;
1660
1661                 /* Next, get the encoded ECPoint */
1662                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1663                     ((bn_ctx = BN_CTX_new()) == NULL))
1664                         {
1665                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1666                         goto err;
1667                         }
1668
1669                 encoded_pt_len = *p;  /* length of encoded point */
1670                 p+=1;
1671                 param_len += (1 + encoded_pt_len);
1672                 if ((param_len > n) ||
1673                     (EC_POINT_oct2point(group, srvr_ecpoint,
1674                         p, encoded_pt_len, bn_ctx) == 0))
1675                         {
1676                         al=SSL_AD_DECODE_ERROR;
1677                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1678                         goto f_err;
1679                         }
1680
1681                 n-=param_len;
1682                 p+=encoded_pt_len;
1683
1684                 /* The ECC/TLS specification does not mention
1685                  * the use of DSA to sign ECParameters in the server
1686                  * key exchange message. We do support RSA and ECDSA.
1687                  */
1688                 if (0) ;
1689 #ifndef OPENSSL_NO_RSA
1690                 else if (alg_a & SSL_aRSA)
1691                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1692 #endif
1693 #ifndef OPENSSL_NO_ECDSA
1694                 else if (alg_a & SSL_aECDSA)
1695                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1696 #endif
1697                 /* else anonymous ECDH, so no certificate or pkey. */
1698                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1699                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1700                 ecdh=NULL;
1701                 BN_CTX_free(bn_ctx);
1702                 bn_ctx = NULL;
1703                 EC_POINT_free(srvr_ecpoint);
1704                 srvr_ecpoint = NULL;
1705                 }
1706         else if (alg_k)
1707                 {
1708                 al=SSL_AD_UNEXPECTED_MESSAGE;
1709                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1710                 goto f_err;
1711                 }
1712 #endif /* !OPENSSL_NO_ECDH */
1713
1714
1715         /* p points to the next byte, there are 'n' bytes left */
1716
1717         /* if it was signed, check the signature */
1718         if (pkey != NULL)
1719                 {
1720                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1721                         {
1722                         int sigalg = tls12_get_sigid(pkey);
1723                         /* Should never happen */
1724                         if (sigalg == -1)
1725                                 {
1726                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1727                                 goto err;
1728                                 }
1729                         /* Check key type is consistent with signature */
1730                         if (sigalg != (int)p[1])
1731                                 {
1732                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1733                                 al=SSL_AD_DECODE_ERROR;
1734                                 goto f_err;
1735                                 }
1736                         md = tls12_get_hash(p[0]);
1737                         if (md == NULL)
1738                                 {
1739                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1740                                 al=SSL_AD_DECODE_ERROR;
1741                                 goto f_err;
1742                                 }
1743 #ifdef SSL_DEBUG
1744 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1745 #endif
1746                         p += 2;
1747                         n -= 2;
1748                         }
1749                 else
1750                         md = EVP_sha1();
1751
1752                 n2s(p,i);
1753                 n-=2;
1754                 j=EVP_PKEY_size(pkey);
1755
1756                 if ((i != n) || (n > j) || (n <= 0))
1757                         {
1758                         /* wrong packet length */
1759                         al=SSL_AD_DECODE_ERROR;
1760                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1761                         goto f_err;
1762                         }
1763
1764 #ifndef OPENSSL_NO_RSA
1765                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1766                         {
1767                         int num;
1768
1769                         j=0;
1770                         q=md_buf;
1771                         for (num=2; num > 0; num--)
1772                                 {
1773                                 EVP_MD_CTX_set_flags(&md_ctx,
1774                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1775                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1776                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1777                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1778                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1779                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1780                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1781                                 q+=i;
1782                                 j+=i;
1783                                 }
1784                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1785                                                                 pkey->pkey.rsa);
1786                         if (i < 0)
1787                                 {
1788                                 al=SSL_AD_DECRYPT_ERROR;
1789                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1790                                 goto f_err;
1791                                 }
1792                         if (i == 0)
1793                                 {
1794                                 /* bad signature */
1795                                 al=SSL_AD_DECRYPT_ERROR;
1796                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1797                                 goto f_err;
1798                                 }
1799                         }
1800                 else
1801 #endif
1802                         {
1803                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1804                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1805                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1806                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1807                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1808                                 {
1809                                 /* bad signature */
1810                                 al=SSL_AD_DECRYPT_ERROR;
1811                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1812                                 goto f_err;
1813                                 }
1814                         }
1815                 }
1816         else
1817                 {
1818                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1819                         /* aNULL or kPSK do not need public keys */
1820                         {
1821                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1822                         goto err;
1823                         }
1824                 /* still data left over */
1825                 if (n != 0)
1826                         {
1827                         al=SSL_AD_DECODE_ERROR;
1828                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1829                         goto f_err;
1830                         }
1831                 }
1832         EVP_PKEY_free(pkey);
1833         EVP_MD_CTX_cleanup(&md_ctx);
1834         return(1);
1835 f_err:
1836         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1837 err:
1838         EVP_PKEY_free(pkey);
1839 #ifndef OPENSSL_NO_RSA
1840         if (rsa != NULL)
1841                 RSA_free(rsa);
1842 #endif
1843 #ifndef OPENSSL_NO_DH
1844         if (dh != NULL)
1845                 DH_free(dh);
1846 #endif
1847 #ifndef OPENSSL_NO_ECDH
1848         BN_CTX_free(bn_ctx);
1849         EC_POINT_free(srvr_ecpoint);
1850         if (ecdh != NULL)
1851                 EC_KEY_free(ecdh);
1852 #endif
1853         EVP_MD_CTX_cleanup(&md_ctx);
1854         return(-1);
1855         }
1856
1857 int ssl3_get_certificate_request(SSL *s)
1858         {
1859         int ok,ret=0;
1860         unsigned long n,nc,l;
1861         unsigned int llen, ctype_num,i;
1862         X509_NAME *xn=NULL;
1863         const unsigned char *p,*q;
1864         unsigned char *d;
1865         STACK_OF(X509_NAME) *ca_sk=NULL;
1866
1867         n=s->method->ssl_get_message(s,
1868                 SSL3_ST_CR_CERT_REQ_A,
1869                 SSL3_ST_CR_CERT_REQ_B,
1870                 -1,
1871                 s->max_cert_list,
1872                 &ok);
1873
1874         if (!ok) return((int)n);
1875
1876         s->s3->tmp.cert_req=0;
1877
1878         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1879                 {
1880                 s->s3->tmp.reuse_message=1;
1881                 /* If we get here we don't need any cached handshake records
1882                  * as we wont be doing client auth.
1883                  */
1884                 if (s->s3->handshake_buffer)
1885                         {
1886                         if (!ssl3_digest_cached_records(s))
1887                                 goto err;
1888                         }
1889                 return(1);
1890                 }
1891
1892         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1893                 {
1894                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1895                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1896                 goto err;
1897                 }
1898
1899         /* TLS does not like anon-DH with client cert */
1900         if (s->version > SSL3_VERSION)
1901                 {
1902                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1903                         {
1904                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1905                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1906                         goto err;
1907                         }
1908                 }
1909
1910         p=d=(unsigned char *)s->init_msg;
1911
1912         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1913                 {
1914                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1915                 goto err;
1916                 }
1917
1918         /* get the certificate types */
1919         ctype_num= *(p++);
1920         if (ctype_num > SSL3_CT_NUMBER)
1921                 ctype_num=SSL3_CT_NUMBER;
1922         for (i=0; i<ctype_num; i++)
1923                 s->s3->tmp.ctype[i]= p[i];
1924         p+=ctype_num;
1925         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1926                 {
1927                 n2s(p, llen);
1928                 /* Check we have enough room for signature algorithms and
1929                  * following length value.
1930                  */
1931                 if ((unsigned long)(p - d + llen + 2) > n)
1932                         {
1933                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1934                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1935                         goto err;
1936                         }
1937                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1938                         {
1939                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1940                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1941                         goto err;
1942                         }
1943                 p += llen;
1944                 }
1945
1946         /* get the CA RDNs */
1947         n2s(p,llen);
1948 #if 0
1949 {
1950 FILE *out;
1951 out=fopen("/tmp/vsign.der","w");
1952 fwrite(p,1,llen,out);
1953 fclose(out);
1954 }
1955 #endif
1956
1957         if ((unsigned long)(p - d + llen) != n)
1958                 {
1959                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1960                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1961                 goto err;
1962                 }
1963
1964         for (nc=0; nc<llen; )
1965                 {
1966                 n2s(p,l);
1967                 if ((l+nc+2) > llen)
1968                         {
1969                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1970                                 goto cont; /* netscape bugs */
1971                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1972                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1973                         goto err;
1974                         }
1975
1976                 q=p;
1977
1978                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1979                         {
1980                         /* If netscape tolerance is on, ignore errors */
1981                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1982                                 goto cont;
1983                         else
1984                                 {
1985                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1986                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1987                                 goto err;
1988                                 }
1989                         }
1990
1991                 if (q != (p+l))
1992                         {
1993                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1994                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1995                         goto err;
1996                         }
1997                 if (!sk_X509_NAME_push(ca_sk,xn))
1998                         {
1999                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2000                         goto err;
2001                         }
2002
2003                 p+=l;
2004                 nc+=l+2;
2005                 }
2006
2007         if (0)
2008                 {
2009 cont:
2010                 ERR_clear_error();
2011                 }
2012
2013         /* we should setup a certificate to return.... */
2014         s->s3->tmp.cert_req=1;
2015         s->s3->tmp.ctype_num=ctype_num;
2016         if (s->s3->tmp.ca_names != NULL)
2017                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2018         s->s3->tmp.ca_names=ca_sk;
2019         ca_sk=NULL;
2020
2021         ret=1;
2022 err:
2023         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2024         return(ret);
2025         }
2026
2027 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2028         {
2029         return(X509_NAME_cmp(*a,*b));
2030         }
2031 #ifndef OPENSSL_NO_TLSEXT
2032 int ssl3_get_new_session_ticket(SSL *s)
2033         {
2034         int ok,al,ret=0, ticklen;
2035         long n;
2036         const unsigned char *p;
2037         unsigned char *d;
2038
2039         n=s->method->ssl_get_message(s,
2040                 SSL3_ST_CR_SESSION_TICKET_A,
2041                 SSL3_ST_CR_SESSION_TICKET_B,
2042                 -1,
2043                 16384,
2044                 &ok);
2045
2046         if (!ok)
2047                 return((int)n);
2048
2049         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2050                 {
2051                 s->s3->tmp.reuse_message=1;
2052                 return(1);
2053                 }
2054         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2055                 {
2056                 al=SSL_AD_UNEXPECTED_MESSAGE;
2057                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2058                 goto f_err;
2059                 }
2060         if (n < 6)
2061                 {
2062                 /* need at least ticket_lifetime_hint + ticket length */
2063                 al = SSL_AD_DECODE_ERROR;
2064                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2065                 goto f_err;
2066                 }
2067
2068         p=d=(unsigned char *)s->init_msg;
2069         n2l(p, s->session->tlsext_tick_lifetime_hint);
2070         n2s(p, ticklen);
2071         /* ticket_lifetime_hint + ticket_length + ticket */
2072         if (ticklen + 6 != n)
2073                 {
2074                 al = SSL_AD_DECODE_ERROR;
2075                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2076                 goto f_err;
2077                 }
2078         if (s->session->tlsext_tick)
2079                 {
2080                 OPENSSL_free(s->session->tlsext_tick);
2081                 s->session->tlsext_ticklen = 0;
2082                 }
2083         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2084         if (!s->session->tlsext_tick)
2085                 {
2086                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2087                 goto err;
2088                 }
2089         memcpy(s->session->tlsext_tick, p, ticklen);
2090         s->session->tlsext_ticklen = ticklen;
2091         /* There are two ways to detect a resumed ticket sesion.
2092          * One is to set an appropriate session ID and then the server
2093          * must return a match in ServerHello. This allows the normal
2094          * client session ID matching to work and we know much
2095          * earlier that the ticket has been accepted.
2096          *
2097          * The other way is to set zero length session ID when the
2098          * ticket is presented and rely on the handshake to determine
2099          * session resumption.
2100          *
2101          * We choose the former approach because this fits in with
2102          * assumptions elsewhere in OpenSSL. The session ID is set
2103          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2104          * ticket.
2105          */
2106         EVP_Digest(p, ticklen,
2107                         s->session->session_id, &s->session->session_id_length,
2108 #ifndef OPENSSL_NO_SHA256
2109                                                         EVP_sha256(), NULL);
2110 #else
2111                                                         EVP_sha1(), NULL);
2112 #endif
2113         ret=1;
2114         return(ret);
2115 f_err:
2116         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2117 err:
2118         return(-1);
2119         }
2120
2121 int ssl3_get_cert_status(SSL *s)
2122         {
2123         int ok, al;
2124         unsigned long resplen,n;
2125         const unsigned char *p;
2126
2127         n=s->method->ssl_get_message(s,
2128                 SSL3_ST_CR_CERT_STATUS_A,
2129                 SSL3_ST_CR_CERT_STATUS_B,
2130                 SSL3_MT_CERTIFICATE_STATUS,
2131                 16384,
2132                 &ok);
2133
2134         if (!ok) return((int)n);
2135         if (n < 4)
2136                 {
2137                 /* need at least status type + length */
2138                 al = SSL_AD_DECODE_ERROR;
2139                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2140                 goto f_err;
2141                 }
2142         p = (unsigned char *)s->init_msg;
2143         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2144                 {
2145                 al = SSL_AD_DECODE_ERROR;
2146                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2147                 goto f_err;
2148                 }
2149         n2l3(p, resplen);
2150         if (resplen + 4 != n)
2151                 {
2152                 al = SSL_AD_DECODE_ERROR;
2153                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2154                 goto f_err;
2155                 }
2156         if (s->tlsext_ocsp_resp)
2157                 OPENSSL_free(s->tlsext_ocsp_resp);
2158         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2159         if (!s->tlsext_ocsp_resp)
2160                 {
2161                 al = SSL_AD_INTERNAL_ERROR;
2162                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2163                 goto f_err;
2164                 }
2165         s->tlsext_ocsp_resplen = resplen;
2166         if (s->ctx->tlsext_status_cb)
2167                 {
2168                 int ret;
2169                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2170                 if (ret == 0)
2171                         {
2172                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2173                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2174                         goto f_err;
2175                         }
2176                 if (ret < 0)
2177                         {
2178                         al = SSL_AD_INTERNAL_ERROR;
2179                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2180                         goto f_err;
2181                         }
2182                 }
2183         return 1;
2184 f_err:
2185         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2186         return(-1);
2187         }
2188 #endif
2189
2190 int ssl3_get_server_done(SSL *s)
2191         {
2192         int ok,ret=0;
2193         long n;
2194
2195         n=s->method->ssl_get_message(s,
2196                 SSL3_ST_CR_SRVR_DONE_A,
2197                 SSL3_ST_CR_SRVR_DONE_B,
2198                 SSL3_MT_SERVER_DONE,
2199                 30, /* should be very small, like 0 :-) */
2200                 &ok);
2201
2202         if (!ok) return((int)n);
2203         if (n > 0)
2204                 {
2205                 /* should contain no data */
2206                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2207                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2208                 return -1;
2209                 }
2210         ret=1;
2211         return(ret);
2212         }
2213
2214
2215 int ssl3_send_client_key_exchange(SSL *s)
2216         {
2217         unsigned char *p,*d;
2218         int n;
2219         unsigned long alg_k;
2220 #ifndef OPENSSL_NO_RSA
2221         unsigned char *q;
2222         EVP_PKEY *pkey=NULL;
2223 #endif
2224 #ifndef OPENSSL_NO_KRB5
2225         KSSL_ERR kssl_err;
2226 #endif /* OPENSSL_NO_KRB5 */
2227 #ifndef OPENSSL_NO_ECDH
2228         EC_KEY *clnt_ecdh = NULL;
2229         const EC_POINT *srvr_ecpoint = NULL;
2230         EVP_PKEY *srvr_pub_pkey = NULL;
2231         unsigned char *encodedPoint = NULL;
2232         int encoded_pt_len = 0;
2233         BN_CTX * bn_ctx = NULL;
2234 #endif
2235
2236         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2237                 {
2238                 d=(unsigned char *)s->init_buf->data;
2239                 p= &(d[4]);
2240
2241                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2242
2243                 /* Fool emacs indentation */
2244                 if (0) {}
2245 #ifndef OPENSSL_NO_RSA
2246                 else if (alg_k & SSL_kRSA)
2247                         {
2248                         RSA *rsa;
2249                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2250
2251                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2252                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2253                         else
2254                                 {
2255                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2256                                 if ((pkey == NULL) ||
2257                                         (pkey->type != EVP_PKEY_RSA) ||
2258                                         (pkey->pkey.rsa == NULL))
2259                                         {
2260                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2261                                         goto err;
2262                                         }
2263                                 rsa=pkey->pkey.rsa;
2264                                 EVP_PKEY_free(pkey);
2265                                 }
2266
2267                         tmp_buf[0]=s->client_version>>8;
2268                         tmp_buf[1]=s->client_version&0xff;
2269                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2270                                         goto err;
2271
2272                         s->session->master_key_length=sizeof tmp_buf;
2273
2274                         q=p;
2275                         /* Fix buf for TLS and beyond */
2276                         if (s->version > SSL3_VERSION)
2277                                 p+=2;
2278                         n=RSA_public_encrypt(sizeof tmp_buf,
2279                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2280 #ifdef PKCS1_CHECK
2281                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2282                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2283 #endif
2284                         if (n <= 0)
2285                                 {
2286                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2287                                 goto err;
2288                                 }
2289
2290                         /* Fix buf for TLS and beyond */
2291                         if (s->version > SSL3_VERSION)
2292                                 {
2293                                 s2n(n,q);
2294                                 n+=2;
2295                                 }
2296
2297                         s->session->master_key_length=
2298                                 s->method->ssl3_enc->generate_master_secret(s,
2299                                         s->session->master_key,
2300                                         tmp_buf,sizeof tmp_buf);
2301                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2302                         }
2303 #endif
2304 #ifndef OPENSSL_NO_KRB5
2305                 else if (alg_k & SSL_kKRB5)
2306                         {
2307                         krb5_error_code krb5rc;
2308                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2309                         /*  krb5_data   krb5_ap_req;  */
2310                         krb5_data       *enc_ticket;
2311                         krb5_data       authenticator, *authp = NULL;
2312                         EVP_CIPHER_CTX  ciph_ctx;
2313                         const EVP_CIPHER *enc = NULL;
2314                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2315                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2316                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2317                                                 + EVP_MAX_IV_LENGTH];
2318                         int             padl, outl = sizeof(epms);
2319
2320                         EVP_CIPHER_CTX_init(&ciph_ctx);
2321
2322 #ifdef KSSL_DEBUG
2323                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2324                                 alg_k, SSL_kKRB5);
2325 #endif  /* KSSL_DEBUG */
2326
2327                         authp = NULL;
2328 #ifdef KRB5SENDAUTH
2329                         if (KRB5SENDAUTH)  authp = &authenticator;
2330 #endif  /* KRB5SENDAUTH */
2331
2332                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2333                                 &kssl_err);
2334                         enc = kssl_map_enc(kssl_ctx->enctype);
2335                         if (enc == NULL)
2336                             goto err;
2337 #ifdef KSSL_DEBUG
2338                         {
2339                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2340                         if (krb5rc && kssl_err.text)
2341                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2342                         }
2343 #endif  /* KSSL_DEBUG */
2344
2345                         if (krb5rc)
2346                                 {
2347                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2348                                                 SSL_AD_HANDSHAKE_FAILURE);
2349                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2350                                                 kssl_err.reason);
2351                                 goto err;
2352                                 }
2353
2354                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2355                         **  in place of RFC 2712 KerberosWrapper, as in:
2356                         **
2357                         **  Send ticket (copy to *p, set n = length)
2358                         **  n = krb5_ap_req.length;
2359                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2360                         **  if (krb5_ap_req.data)
2361                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2362                         **
2363                         **  Now using real RFC 2712 KerberosWrapper
2364                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2365                         **  Note: 2712 "opaque" types are here replaced
2366                         **  with a 2-byte length followed by the value.
2367                         **  Example:
2368                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2369                         **  Where "xx xx" = length bytes.  Shown here with
2370                         **  optional authenticator omitted.
2371                         */
2372
2373                         /*  KerberosWrapper.Ticket              */
2374                         s2n(enc_ticket->length,p);
2375                         memcpy(p, enc_ticket->data, enc_ticket->length);
2376                         p+= enc_ticket->length;
2377                         n = enc_ticket->length + 2;
2378
2379                         /*  KerberosWrapper.Authenticator       */
2380                         if (authp  &&  authp->length)
2381                                 {
2382                                 s2n(authp->length,p);
2383                                 memcpy(p, authp->data, authp->length);
2384                                 p+= authp->length;
2385                                 n+= authp->length + 2;
2386
2387                                 free(authp->data);
2388                                 authp->data = NULL;
2389                                 authp->length = 0;
2390                                 }
2391                         else
2392                                 {
2393                                 s2n(0,p);/*  null authenticator length  */
2394                                 n+=2;
2395                                 }
2396
2397                             tmp_buf[0]=s->client_version>>8;
2398                             tmp_buf[1]=s->client_version&0xff;
2399                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2400                                 goto err;
2401
2402                         /*  20010420 VRS.  Tried it this way; failed.
2403                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2404                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2405                         **                              kssl_ctx->length);
2406                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2407                         */
2408
2409                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2410                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2411                                 kssl_ctx->key,iv);
2412                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2413                                 sizeof tmp_buf);
2414                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2415                         outl += padl;
2416                         if (outl > (int)sizeof epms)
2417                                 {
2418                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2419                                 goto err;
2420                                 }
2421                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2422
2423                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2424                         s2n(outl,p);
2425                         memcpy(p, epms, outl);
2426                         p+=outl;
2427                         n+=outl + 2;
2428
2429                         s->session->master_key_length=
2430                                 s->method->ssl3_enc->generate_master_secret(s,
2431                                         s->session->master_key,
2432                                         tmp_buf, sizeof tmp_buf);
2433
2434                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2435                         OPENSSL_cleanse(epms, outl);
2436                         }
2437 #endif
2438 #ifndef OPENSSL_NO_DH
2439                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2440                         {
2441                         DH *dh_srvr,*dh_clnt;
2442
2443                         if (s->session->sess_cert == NULL)
2444                                 {
2445                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2446                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2447                                 goto err;
2448                                 }
2449
2450                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2451                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2452                         else
2453                                 {
2454                                 /* we get them from the cert */
2455                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2456                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2457                                 goto err;
2458                                 }
2459
2460                         /* generate a new random key */
2461                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2462                                 {
2463                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2464                                 goto err;
2465                                 }
2466                         if (!DH_generate_key(dh_clnt))
2467                                 {
2468                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2469                                 DH_free(dh_clnt);
2470                                 goto err;
2471                                 }
2472
2473                         /* use the 'p' output buffer for the DH key, but
2474                          * make sure to clear it out afterwards */
2475
2476                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2477
2478                         if (n <= 0)
2479                                 {
2480                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2481                                 DH_free(dh_clnt);
2482                                 goto err;
2483                                 }
2484
2485                         /* generate master key from the result */
2486                         s->session->master_key_length=
2487                                 s->method->ssl3_enc->generate_master_secret(s,
2488                                         s->session->master_key,p,n);
2489                         /* clean up */
2490                         memset(p,0,n);
2491
2492                         /* send off the data */
2493                         n=BN_num_bytes(dh_clnt->pub_key);
2494                         s2n(n,p);
2495                         BN_bn2bin(dh_clnt->pub_key,p);
2496                         n+=2;
2497
2498                         DH_free(dh_clnt);
2499
2500                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2501                         }
2502 #endif
2503
2504 #ifndef OPENSSL_NO_ECDH
2505                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2506                         {
2507                         const EC_GROUP *srvr_group = NULL;
2508                         EC_KEY *tkey;
2509                         int ecdh_clnt_cert = 0;
2510                         int field_size = 0;
2511
2512                         /* Did we send out the client's
2513                          * ECDH share for use in premaster
2514                          * computation as part of client certificate?
2515                          * If so, set ecdh_clnt_cert to 1.
2516                          */
2517                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2518                                 {
2519                                 /* XXX: For now, we do not support client
2520                                  * authentication using ECDH certificates.
2521                                  * To add such support, one needs to add
2522                                  * code that checks for appropriate
2523                                  * conditions and sets ecdh_clnt_cert to 1.
2524                                  * For example, the cert have an ECC
2525                                  * key on the same curve as the server's
2526                                  * and the key should be authorized for
2527                                  * key agreement.
2528                                  *
2529                                  * One also needs to add code in ssl3_connect
2530                                  * to skip sending the certificate verify
2531                                  * message.
2532                                  *
2533                                  * if ((s->cert->key->privatekey != NULL) &&
2534                                  *     (s->cert->key->privatekey->type ==
2535                                  *      EVP_PKEY_EC) && ...)
2536                                  * ecdh_clnt_cert = 1;
2537                                  */
2538                                 }
2539
2540                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2541                                 {
2542                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2543                                 }
2544                         else
2545                                 {
2546                                 /* Get the Server Public Key from Cert */
2547                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2548                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2549                                 if ((srvr_pub_pkey == NULL) ||
2550                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2551                                     (srvr_pub_pkey->pkey.ec == NULL))
2552                                         {
2553                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2554                                             ERR_R_INTERNAL_ERROR);
2555                                         goto err;
2556                                         }
2557
2558                                 tkey = srvr_pub_pkey->pkey.ec;
2559                                 }
2560
2561                         srvr_group   = EC_KEY_get0_group(tkey);
2562                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2563
2564                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2565                                 {
2566                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2567                                     ERR_R_INTERNAL_ERROR);
2568                                 goto err;
2569                                 }
2570
2571                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2572                                 {
2573                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2574                                 goto err;
2575                                 }
2576
2577                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2578                                 {
2579                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2580                                 goto err;
2581                                 }
2582                         if (ecdh_clnt_cert)
2583                                 {
2584                                 /* Reuse key info from our certificate
2585                                  * We only need our private key to perform
2586                                  * the ECDH computation.
2587                                  */
2588                                 const BIGNUM *priv_key;
2589                                 tkey = s->cert->key->privatekey->pkey.ec;
2590                                 priv_key = EC_KEY_get0_private_key(tkey);
2591                                 if (priv_key == NULL)
2592                                         {
2593                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2594                                         goto err;
2595                                         }
2596                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2597                                         {
2598                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2599                                         goto err;
2600                                         }
2601                                 }
2602                         else
2603                                 {
2604                                 /* Generate a new ECDH key pair */
2605                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2606                                         {
2607                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2608                                         goto err;
2609                                         }
2610                                 }
2611
2612                         /* use the 'p' output buffer for the ECDH key, but
2613                          * make sure to clear it out afterwards
2614                          */
2615
2616                         field_size = EC_GROUP_get_degree(srvr_group);
2617                         if (field_size <= 0)
2618                                 {
2619                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2620                                        ERR_R_ECDH_LIB);
2621                                 goto err;
2622                                 }
2623                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2624                         if (n <= 0)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2627                                        ERR_R_ECDH_LIB);
2628                                 goto err;
2629                                 }
2630
2631                         /* generate master key from the result */
2632                         s->session->master_key_length = s->method->ssl3_enc \
2633                             -> generate_master_secret(s,
2634                                 s->session->master_key,
2635                                 p, n);
2636
2637                         memset(p, 0, n); /* clean up */
2638
2639                         if (ecdh_clnt_cert)
2640                                 {
2641                                 /* Send empty client key exch message */
2642                                 n = 0;
2643                                 }
2644                         else
2645                                 {
2646                                 /* First check the size of encoding and
2647                                  * allocate memory accordingly.
2648                                  */
2649                                 encoded_pt_len =
2650                                     EC_POINT_point2oct(srvr_group,
2651                                         EC_KEY_get0_public_key(clnt_ecdh),
2652                                         POINT_CONVERSION_UNCOMPRESSED,
2653                                         NULL, 0, NULL);
2654
2655                                 encodedPoint = (unsigned char *)
2656                                     OPENSSL_malloc(encoded_pt_len *
2657                                         sizeof(unsigned char));
2658                                 bn_ctx = BN_CTX_new();
2659                                 if ((encodedPoint == NULL) ||
2660                                     (bn_ctx == NULL))
2661                                         {
2662                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2663                                         goto err;
2664                                         }
2665
2666                                 /* Encode the public key */
2667                                 n = EC_POINT_point2oct(srvr_group,
2668                                     EC_KEY_get0_public_key(clnt_ecdh),
2669                                     POINT_CONVERSION_UNCOMPRESSED,
2670                                     encodedPoint, encoded_pt_len, bn_ctx);
2671
2672                                 *p = n; /* length of encoded point */
2673                                 /* Encoded point will be copied here */
2674                                 p += 1;
2675                                 /* copy the point */
2676                                 memcpy((unsigned char *)p, encodedPoint, n);
2677                                 /* increment n to account for length field */
2678                                 n += 1;
2679                                 }
2680
2681                         /* Free allocated memory */
2682                         BN_CTX_free(bn_ctx);
2683                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2684                         if (clnt_ecdh != NULL)
2685                                  EC_KEY_free(clnt_ecdh);
2686                         EVP_PKEY_free(srvr_pub_pkey);
2687                         }
2688 #endif /* !OPENSSL_NO_ECDH */
2689                 else if (alg_k & SSL_kGOST)
2690                         {
2691                         /* GOST key exchange message creation */
2692                         EVP_PKEY_CTX *pkey_ctx;
2693                         X509 *peer_cert;
2694                         size_t msglen;
2695                         unsigned int md_len;
2696                         int keytype;
2697                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2698                         EVP_MD_CTX *ukm_hash;
2699                         EVP_PKEY *pub_key;
2700
2701                         /* Get server sertificate PKEY and create ctx from it */
2702                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2703                         if (!peer_cert)
2704                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2705                         if (!peer_cert)         {
2706                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2707                                         goto err;
2708                                 }
2709
2710                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2711                         /* If we have send a certificate, and certificate key
2712
2713                          * parameters match those of server certificate, use
2714                          * certificate key for key exchange
2715                          */
2716
2717                          /* Otherwise, generate ephemeral key pair */
2718
2719                         EVP_PKEY_encrypt_init(pkey_ctx);
2720                           /* Generate session key */
2721                     RAND_bytes(premaster_secret,32);
2722                         /* If we have client certificate, use its secret as peer key */
2723                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2724                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2725                                         /* If there was an error - just ignore it. Ephemeral key
2726                                         * would be used
2727                                         */
2728                                         ERR_clear_error();
2729                                 }
2730                         }
2731                         /* Compute shared IV and store it in algorithm-specific
2732                          * context data */
2733                         ukm_hash = EVP_MD_CTX_create();
2734                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2735                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2736                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2737                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2738                         EVP_MD_CTX_destroy(ukm_hash);
2739                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2740                                 8,shared_ukm)<0) {
2741                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2742                                                 SSL_R_LIBRARY_BUG);
2743                                         goto err;
2744                                 }
2745                         /* Make GOST keytransport blob message */
2746                         /*Encapsulate it into sequence */
2747                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2748                         msglen=255;
2749                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2750                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2751                                         SSL_R_LIBRARY_BUG);
2752                                 goto err;
2753                         }
2754                         if (msglen >= 0x80)
2755                                 {
2756                                 *(p++)=0x81;
2757                                 *(p++)= msglen & 0xff;
2758                                 n=msglen+3;
2759                                 }
2760                         else
2761                                 {
2762                                 *(p++)= msglen & 0xff;
2763                                 n=msglen+2;
2764                                 }
2765                         memcpy(p, tmp, msglen);
2766                         /* Check if pubkey from client certificate was used */
2767                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2768                                 {
2769                                 /* Set flag "skip certificate verify" */
2770                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2771                                 }
2772                         EVP_PKEY_CTX_free(pkey_ctx);
2773                         s->session->master_key_length=
2774                                 s->method->ssl3_enc->generate_master_secret(s,
2775                                         s->session->master_key,premaster_secret,32);
2776                         EVP_PKEY_free(pub_key);
2777
2778                         }
2779 #ifndef OPENSSL_NO_SRP
2780                 else if (alg_k & SSL_kSRP)
2781                         {
2782                         if (s->srp_ctx.A != NULL)
2783                                 {
2784                                 /* send off the data */
2785                                 n=BN_num_bytes(s->srp_ctx.A);
2786                                 s2n(n,p);
2787                                 BN_bn2bin(s->srp_ctx.A,p);
2788                                 n+=2;
2789                                 }
2790                         else
2791                                 {
2792                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2793                                 goto err;
2794                                 }
2795                         if (s->session->srp_username != NULL)
2796                                 OPENSSL_free(s->session->srp_username);
2797                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2798                         if (s->session->srp_username == NULL)
2799                                 {
2800                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2801                                         ERR_R_MALLOC_FAILURE);
2802                                 goto err;
2803                                 }
2804
2805                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2806                                 {
2807                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2808                                 goto err;
2809                                 }
2810                         }
2811 #endif
2812 #ifndef OPENSSL_NO_PSK
2813                 else if (alg_k & SSL_kPSK)
2814                         {
2815                         char identity[PSK_MAX_IDENTITY_LEN];
2816                         unsigned char *t = NULL;
2817                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2818                         unsigned int pre_ms_len = 0, psk_len = 0;
2819                         int psk_err = 1;
2820
2821                         n = 0;
2822                         if (s->psk_client_callback == NULL)
2823                                 {
2824                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2825                                         SSL_R_PSK_NO_CLIENT_CB);
2826                                 goto err;
2827                                 }
2828
2829                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2830                                 identity, PSK_MAX_IDENTITY_LEN,
2831                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2832                         if (psk_len > PSK_MAX_PSK_LEN)
2833                                 {
2834                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2835                                         ERR_R_INTERNAL_ERROR);
2836                                 goto psk_err;
2837                                 }
2838                         else if (psk_len == 0)
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2841                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2842                                 goto psk_err;
2843                                 }
2844
2845                         /* create PSK pre_master_secret */
2846                         pre_ms_len = 2+psk_len+2+psk_len;
2847                         t = psk_or_pre_ms;
2848                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2849                         s2n(psk_len, t);
2850                         memset(t, 0, psk_len);
2851                         t+=psk_len;
2852                         s2n(psk_len, t);
2853
2854                         if (s->session->psk_identity_hint != NULL)
2855                                 OPENSSL_free(s->session->psk_identity_hint);
2856                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2857                         if (s->ctx->psk_identity_hint != NULL &&
2858                                 s->session->psk_identity_hint == NULL)
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2861                                         ERR_R_MALLOC_FAILURE);
2862                                 goto psk_err;
2863                                 }
2864
2865                         if (s->session->psk_identity != NULL)
2866                                 OPENSSL_free(s->session->psk_identity);
2867                         s->session->psk_identity = BUF_strdup(identity);
2868                         if (s->session->psk_identity == NULL)
2869                                 {
2870                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2871                                         ERR_R_MALLOC_FAILURE);
2872                                 goto psk_err;
2873                                 }
2874
2875                         s->session->master_key_length =
2876                                 s->method->ssl3_enc->generate_master_secret(s,
2877                                         s->session->master_key,
2878                                         psk_or_pre_ms, pre_ms_len);
2879                         n = strlen(identity);
2880                         s2n(n, p);
2881                         memcpy(p, identity, n);
2882                         n+=2;
2883                         psk_err = 0;
2884                 psk_err:
2885                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2886                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2887                         if (psk_err != 0)
2888                                 {
2889                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2890                                 goto err;
2891                                 }
2892                         }
2893 #endif
2894                 else
2895                         {
2896                         ssl3_send_alert(s, SSL3_AL_FATAL,
2897                             SSL_AD_HANDSHAKE_FAILURE);
2898                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2899                             ERR_R_INTERNAL_ERROR);
2900                         goto err;
2901                         }
2902
2903                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2904                 l2n3(n,d);
2905
2906                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2907                 /* number of bytes to write */
2908                 s->init_num=n+4;
2909                 s->init_off=0;
2910                 }
2911
2912         /* SSL3_ST_CW_KEY_EXCH_B */
2913         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2914 err:
2915 #ifndef OPENSSL_NO_ECDH
2916         BN_CTX_free(bn_ctx);
2917         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2918         if (clnt_ecdh != NULL)
2919                 EC_KEY_free(clnt_ecdh);
2920         EVP_PKEY_free(srvr_pub_pkey);
2921 #endif
2922         return(-1);
2923         }
2924
2925 int ssl3_send_client_verify(SSL *s)
2926         {
2927         unsigned char *p,*d;
2928         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2929         EVP_PKEY *pkey;
2930         EVP_PKEY_CTX *pctx=NULL;
2931         EVP_MD_CTX mctx;
2932         unsigned u=0;
2933         unsigned long n;
2934         int j;
2935
2936         EVP_MD_CTX_init(&mctx);
2937
2938         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2939                 {
2940                 d=(unsigned char *)s->init_buf->data;
2941                 p= &(d[4]);
2942                 pkey=s->cert->key->privatekey;
2943 /* Create context from key and test if sha1 is allowed as digest */
2944                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2945                 EVP_PKEY_sign_init(pctx);
2946                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2947                         {
2948                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2949                                 s->method->ssl3_enc->cert_verify_mac(s,
2950                                                 NID_sha1,
2951                                                 &(data[MD5_DIGEST_LENGTH]));
2952                         }
2953                 else
2954                         {
2955                         ERR_clear_error();
2956                         }
2957                 /* For TLS v1.2 send signature algorithm and signature
2958                  * using agreed digest and cached handshake records.
2959                  */
2960                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2961                         {
2962                         long hdatalen = 0;
2963                         void *hdata;
2964                         const EVP_MD *md = s->cert->key->digest;
2965                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2966                                                                 &hdata);
2967                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2968                                 {
2969                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2970                                                 ERR_R_INTERNAL_ERROR);
2971                                 goto err;
2972                                 }
2973                         p += 2;
2974 #ifdef SSL_DEBUG
2975                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2976                                                         EVP_MD_name(md));
2977 #endif
2978                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2979                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2980                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2981                                 {
2982                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2983                                                 ERR_R_EVP_LIB);
2984                                 goto err;
2985                                 }
2986                         s2n(u,p);
2987                         n = u + 4;
2988                         if (!ssl3_digest_cached_records(s))
2989                                 goto err;
2990                         }
2991                 else
2992 #ifndef OPENSSL_NO_RSA
2993                 if (pkey->type == EVP_PKEY_RSA)
2994                         {
2995                         s->method->ssl3_enc->cert_verify_mac(s,
2996                                 NID_md5,
2997                                 &(data[0]));
2998                         if (RSA_sign(NID_md5_sha1, data,
2999                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3000                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3001                                 {
3002                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3003                                 goto err;
3004                                 }
3005                         s2n(u,p);
3006                         n=u+2;
3007                         }
3008                 else
3009 #endif
3010 #ifndef OPENSSL_NO_DSA
3011                         if (pkey->type == EVP_PKEY_DSA)
3012                         {
3013                         if (!DSA_sign(pkey->save_type,
3014                                 &(data[MD5_DIGEST_LENGTH]),
3015                                 SHA_DIGEST_LENGTH,&(p[2]),
3016                                 (unsigned int *)&j,pkey->pkey.dsa))
3017                                 {
3018                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3019                                 goto err;
3020                                 }
3021                         s2n(j,p);
3022                         n=j+2;
3023                         }
3024                 else
3025 #endif
3026 #ifndef OPENSSL_NO_ECDSA
3027                         if (pkey->type == EVP_PKEY_EC)
3028                         {
3029                         if (!ECDSA_sign(pkey->save_type,
3030                                 &(data[MD5_DIGEST_LENGTH]),
3031                                 SHA_DIGEST_LENGTH,&(p[2]),
3032                                 (unsigned int *)&j,pkey->pkey.ec))
3033                                 {
3034                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3035                                     ERR_R_ECDSA_LIB);
3036                                 goto err;
3037                                 }
3038                         s2n(j,p);
3039                         n=j+2;
3040                         }
3041                 else
3042 #endif
3043                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3044                 {
3045                 unsigned char signbuf[64];
3046                 int i;
3047                 size_t sigsize=64;
3048                 s->method->ssl3_enc->cert_verify_mac(s,
3049                         NID_id_GostR3411_94,
3050                         data);
3051                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3052                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3053                         ERR_R_INTERNAL_ERROR);
3054                         goto err;
3055                 }
3056                 for (i=63,j=0; i>=0; j++, i--) {
3057                         p[2+j]=signbuf[i];
3058                 }
3059                 s2n(j,p);
3060                 n=j+2;
3061                 }
3062                 else
3063                 {
3064                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3065                         goto err;
3066                 }
3067                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3068                 l2n3(n,d);
3069
3070                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3071                 s->init_num=(int)n+4;
3072                 s->init_off=0;
3073                 }
3074         EVP_MD_CTX_cleanup(&mctx);
3075         EVP_PKEY_CTX_free(pctx);
3076         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3077 err:
3078         EVP_MD_CTX_cleanup(&mctx);
3079         EVP_PKEY_CTX_free(pctx);
3080         return(-1);
3081         }
3082
3083 int ssl3_send_client_certificate(SSL *s)
3084         {
3085         X509 *x509=NULL;
3086         EVP_PKEY *pkey=NULL;
3087         int i;
3088         unsigned long l;
3089
3090         if (s->state == SSL3_ST_CW_CERT_A)
3091                 {
3092                 if ((s->cert == NULL) ||
3093                         (s->cert->key->x509 == NULL) ||
3094                         (s->cert->key->privatekey == NULL))
3095                         s->state=SSL3_ST_CW_CERT_B;
3096                 else
3097                         s->state=SSL3_ST_CW_CERT_C;
3098                 }
3099
3100         /* We need to get a client cert */
3101         if (s->state == SSL3_ST_CW_CERT_B)
3102                 {
3103                 /* If we get an error, we need to
3104                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3105                  * We then get retied later */
3106                 i=0;
3107                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3108                 if (i < 0)
3109                         {
3110                         s->rwstate=SSL_X509_LOOKUP;
3111                         return(-1);
3112                         }
3113                 s->rwstate=SSL_NOTHING;
3114                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3115                         {
3116                         s->state=SSL3_ST_CW_CERT_B;
3117                         if (    !SSL_use_certificate(s,x509) ||
3118                                 !SSL_use_PrivateKey(s,pkey))
3119                                 i=0;
3120                         }
3121                 else if (i == 1)
3122                         {
3123                         i=0;
3124                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3125                         }
3126
3127                 if (x509 != NULL) X509_free(x509);
3128                 if (pkey != NULL) EVP_PKEY_free(pkey);
3129                 if (i == 0)
3130                         {
3131                         if (s->version == SSL3_VERSION)
3132                                 {
3133                                 s->s3->tmp.cert_req=0;
3134                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3135                                 return(1);
3136                                 }
3137                         else
3138                                 {
3139                                 s->s3->tmp.cert_req=2;
3140                                 }
3141                         }
3142
3143                 /* Ok, we have a cert */
3144                 s->state=SSL3_ST_CW_CERT_C;
3145                 }
3146
3147         if (s->state == SSL3_ST_CW_CERT_C)
3148                 {
3149                 s->state=SSL3_ST_CW_CERT_D;
3150                 l=ssl3_output_cert_chain(s,
3151                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3152                 s->init_num=(int)l;
3153                 s->init_off=0;
3154                 }
3155         /* SSL3_ST_CW_CERT_D */
3156         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3157         }
3158
3159 #define has_bits(i,m)   (((i)&(m)) == (m))
3160
3161 int ssl3_check_cert_and_algorithm(SSL *s)
3162         {
3163         int i,idx;
3164         long alg_k,alg_a;
3165         EVP_PKEY *pkey=NULL;
3166         SESS_CERT *sc;
3167 #ifndef OPENSSL_NO_RSA
3168         RSA *rsa;
3169 #endif
3170 #ifndef OPENSSL_NO_DH
3171         DH *dh;
3172 #endif
3173
3174         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3175         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3176
3177         /* we don't have a certificate */
3178         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3179                 return(1);
3180
3181         sc=s->session->sess_cert;
3182         if (sc == NULL)
3183                 {
3184                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3185                 goto err;
3186                 }
3187
3188 #ifndef OPENSSL_NO_RSA
3189         rsa=s->session->sess_cert->peer_rsa_tmp;
3190 #endif
3191 #ifndef OPENSSL_NO_DH
3192         dh=s->session->sess_cert->peer_dh_tmp;
3193 #endif
3194
3195         /* This is the passed certificate */
3196
3197         idx=sc->peer_cert_type;
3198 #ifndef OPENSSL_NO_ECDH
3199         if (idx == SSL_PKEY_ECC)
3200                 {
3201                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3202                                                                 s) == 0)
3203                         { /* check failed */
3204                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3205                         goto f_err;
3206                         }
3207                 else
3208                         {
3209                         return 1;
3210                         }
3211                 }
3212 #endif
3213         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3214         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3215         EVP_PKEY_free(pkey);
3216
3217
3218         /* Check that we have a certificate if we require one */
3219         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3220                 {
3221                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3222                 goto f_err;
3223                 }
3224 #ifndef OPENSSL_NO_DSA
3225         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3226                 {
3227                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3228                 goto f_err;
3229                 }
3230 #endif
3231 #ifndef OPENSSL_NO_RSA
3232         if ((alg_k & SSL_kRSA) &&
3233                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3234                 {
3235                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3236                 goto f_err;
3237                 }
3238 #endif
3239 #ifndef OPENSSL_NO_DH
3240         if ((alg_k & SSL_kEDH) &&
3241                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3242                 {
3243                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3244                 goto f_err;
3245                 }
3246         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3247                 {
3248                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3249                 goto f_err;
3250                 }
3251 #ifndef OPENSSL_NO_DSA
3252         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3253                 {
3254                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3255                 goto f_err;
3256                 }
3257 #endif
3258 #endif
3259
3260         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3261                 {
3262 #ifndef OPENSSL_NO_RSA
3263                 if (alg_k & SSL_kRSA)
3264                         {
3265                         if (rsa == NULL
3266                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3267                                 {
3268                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3269                                 goto f_err;
3270                                 }
3271                         }
3272                 else
3273 #endif
3274 #ifndef OPENSSL_NO_DH
3275                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3276                             {
3277                             if (dh == NULL
3278                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3279                                 {
3280                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3281                                 goto f_err;
3282                                 }
3283                         }
3284                 else
3285 #endif
3286                         {
3287                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3288                         goto f_err;
3289                         }
3290                 }
3291         return(1);
3292 f_err:
3293         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3294 err:
3295         return(0);
3296         }
3297
3298 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3299 int ssl3_send_next_proto(SSL *s)
3300         {
3301         unsigned int len, padding_len;
3302         unsigned char *d;
3303
3304         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3305                 {
3306                 len = s->next_proto_negotiated_len;
3307                 padding_len = 32 - ((len + 2) % 32);
3308                 d = (unsigned char *)s->init_buf->data;
3309                 d[4] = len;
3310                 memcpy(d + 5, s->next_proto_negotiated, len);
3311                 d[5 + len] = padding_len;
3312                 memset(d + 6 + len, 0, padding_len);
3313                 *(d++)=SSL3_MT_NEXT_PROTO;
3314                 l2n3(2 + len + padding_len, d);
3315                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3316                 s->init_num = 4 + 2 + len + padding_len;
3317                 s->init_off = 0;
3318                 }
3319
3320         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3321 }
3322 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3323
3324 /* Check to see if handshake is full or resumed. Usually this is just a
3325  * case of checking to see if a cache hit has occurred. In the case of
3326  * session tickets we have to check the next message to be sure.
3327  */
3328
3329 #ifndef OPENSSL_NO_TLSEXT
3330 int ssl3_check_finished(SSL *s)
3331         {
3332         int ok;
3333         long n;
3334         /* If we have no ticket it cannot be a resumed session. */
3335         if (!s->session->tlsext_tick)
3336                 return 1;
3337         /* this function is called when we really expect a Certificate
3338          * message, so permit appropriate message length */
3339         n=s->method->ssl_get_message(s,
3340                 SSL3_ST_CR_CERT_A,
3341                 SSL3_ST_CR_CERT_B,
3342                 -1,
3343                 s->max_cert_list,
3344                 &ok);
3345         if (!ok) return((int)n);
3346         s->s3->tmp.reuse_message = 1;
3347         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3348                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3349                 return 2;
3350
3351         return 1;
3352         }
3353 #endif
3354
3355 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3356         {
3357         int i = 0;
3358 #ifndef OPENSSL_NO_ENGINE
3359         if (s->ctx->client_cert_engine)
3360                 {
3361                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3362                                                 SSL_get_client_CA_list(s),
3363                                                 px509, ppkey, NULL, NULL, NULL);
3364                 if (i != 0)
3365                         return i;
3366                 }
3367 #endif
3368         if (s->ctx->client_cert_cb)
3369                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3370         return i;
3371         }