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                                 {
 310 #ifndef OPENSSL_NO_TLSEXT
 311                                 /* The server hello indicated that
 312                                  * an audit proof would follow. */
 313                                 if (s->s3->tlsext_authz_server_promised)
 314                                         s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 315                                 else
 316 #endif
 317                                         s->state=SSL3_ST_CR_CERT_A;
 318                                 }
 319                         s->init_num=0;
 320                         break;
 321 #ifndef OPENSSL_NO_TLSEXT
 322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
 323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
 324                         ret = tls1_get_server_supplemental_data(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_A;
 327                         s->init_num = 0;
 328                         break;
 329 #endif
 330                 case SSL3_ST_CR_CERT_A:
 331                 case SSL3_ST_CR_CERT_B:
 332 #ifndef OPENSSL_NO_TLSEXT
 333                         ret=ssl3_check_finished(s);
 334                         if (ret <= 0) goto end;
 335                         if (ret == 2)
 336                                 {
 337                                 s->hit = 1;
 338                                 if (s->tlsext_ticket_expected)
 339                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_FINISHED_A;
 342                                 s->init_num=0;
 343                                 break;
 344                                 }
 345 #endif
 346                         /* Check if it is anon DH/ECDH */
 347                         /* or PSK */
 348                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 349                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 350                                 {
 351                                 ret=ssl3_get_server_certificate(s);
 352                                 if (ret <= 0) goto end;
 353 #ifndef OPENSSL_NO_TLSEXT
 354                                 if (s->tlsext_status_expected)
 355                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 356                                 else
 357                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 358                                 }
 359                         else
 360                                 {
 361                                 skip = 1;
 362                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 363                                 }
 364 #else
 365                                 }
 366                         else
 367                                 skip=1;
 368
 369                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 370 #endif
 371                         s->init_num=0;
 372                         break;
 373
 374                 case SSL3_ST_CR_KEY_EXCH_A:
 375                 case SSL3_ST_CR_KEY_EXCH_B:
 376                         ret=ssl3_get_key_exchange(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_CERT_REQ_A;
 379                         s->init_num=0;
 380
 381                         /* at this point we check that we have the
 382                          * required stuff from the server */
 383                         if (!ssl3_check_cert_and_algorithm(s))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388                         break;
 389
 390                 case SSL3_ST_CR_CERT_REQ_A:
 391                 case SSL3_ST_CR_CERT_REQ_B:
 392                         ret=ssl3_get_certificate_request(s);
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CR_SRVR_DONE_A:
 399                 case SSL3_ST_CR_SRVR_DONE_B:
 400                         ret=ssl3_get_server_done(s);
 401                         if (ret <= 0) goto end;
 402 #ifndef OPENSSL_NO_SRP
 403                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 404                                 {
 405                                 if ((ret = SRP_Calc_A_param(s))<=0)
 406                                         {
 407                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 408                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 409                                         goto end;
 410                                         }
 411                                 }
 412 #endif
 413                         if (s->s3->tmp.cert_req)
 414                                 s->state=SSL3_ST_CW_CERT_A;
 415                         else
 416                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 417                         s->init_num=0;
 418
 419                         break;
 420
 421                 case SSL3_ST_CW_CERT_A:
 422                 case SSL3_ST_CW_CERT_B:
 423                 case SSL3_ST_CW_CERT_C:
 424                 case SSL3_ST_CW_CERT_D:
 425                         ret=ssl3_send_client_certificate(s);
 426                         if (ret <= 0) goto end;
 427                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 428                         s->init_num=0;
 429                         break;
 430
 431                 case SSL3_ST_CW_KEY_EXCH_A:
 432                 case SSL3_ST_CW_KEY_EXCH_B:
 433                         ret=ssl3_send_client_key_exchange(s);
 434                         if (ret <= 0) goto end;
 435                         /* EAY EAY EAY need to check for DH fix cert
 436                          * sent back */
 437                         /* For TLS, cert_req is set to 2, so a cert chain
 438                          * of nothing is sent, but no verify packet is sent */
 439                         /* XXX: For now, we do not support client
 440                          * authentication in ECDH cipher suites with
 441                          * ECDH (rather than ECDSA) certificates.
 442                          * We need to skip the certificate verify
 443                          * message when client's ECDH public key is sent
 444                          * inside the client certificate.
 445                          */
 446                         if (s->s3->tmp.cert_req == 1)
 447                                 {
 448                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 449                                 }
 450                         else
 451                                 {
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                                 s->s3->change_cipher_spec=0;
 454                                 }
 455                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 456                                 {
 457                                 s->state=SSL3_ST_CW_CHANGE_A;
 458                                 s->s3->change_cipher_spec=0;
 459                                 }
 460
 461                         s->init_num=0;
 462                         break;
 463
 464                 case SSL3_ST_CW_CERT_VRFY_A:
 465                 case SSL3_ST_CW_CERT_VRFY_B:
 466                         ret=ssl3_send_client_verify(s);
 467                         if (ret <= 0) goto end;
 468                         s->state=SSL3_ST_CW_CHANGE_A;
 469                         s->init_num=0;
 470                         s->s3->change_cipher_spec=0;
 471                         break;
 472
 473                 case SSL3_ST_CW_CHANGE_A:
 474                 case SSL3_ST_CW_CHANGE_B:
 475                         ret=ssl3_send_change_cipher_spec(s,
 476                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 477                         if (ret <= 0) goto end;
 478
 479 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 480                         s->state=SSL3_ST_CW_FINISHED_A;
 481 #else
 482                         if (s->s3->next_proto_neg_seen)
 483                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 484                         else
 485                                 s->state=SSL3_ST_CW_FINISHED_A;
 486 #endif
 487                         s->init_num=0;
 488
 489                         s->session->cipher=s->s3->tmp.new_cipher;
 490 #ifdef OPENSSL_NO_COMP
 491                         s->session->compress_meth=0;
 492 #else
 493                         if (s->s3->tmp.new_compression == NULL)
 494                                 s->session->compress_meth=0;
 495                         else
 496                                 s->session->compress_meth=
 497                                         s->s3->tmp.new_compression->id;
 498 #endif
 499                         if (!s->method->ssl3_enc->setup_key_block(s))
 500                                 {
 501                                 ret= -1;
 502                                 goto end;
 503                                 }
 504
 505                         if (!s->method->ssl3_enc->change_cipher_state(s,
 506                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 507                                 {
 508                                 ret= -1;
 509                                 goto end;
 510                                 }
 511
 512                         break;
 513
 514 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 515                 case SSL3_ST_CW_NEXT_PROTO_A:
 516                 case SSL3_ST_CW_NEXT_PROTO_B:
 517                         ret=ssl3_send_next_proto(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CW_FINISHED_A;
 520                         break;
 521 #endif
 522
 523                 case SSL3_ST_CW_FINISHED_A:
 524                 case SSL3_ST_CW_FINISHED_B:
 525                         ret=ssl3_send_finished(s,
 526                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 527                                 s->method->ssl3_enc->client_finished_label,
 528                                 s->method->ssl3_enc->client_finished_label_len);
 529                         if (ret <= 0) goto end;
 530                         s->state=SSL3_ST_CW_FLUSH;
 531
 532                         /* clear flags */
 533                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 534                         if (s->hit)
 535                                 {
 536                                 s->s3->tmp.next_state=SSL_ST_OK;
 537                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 538                                         {
 539                                         s->state=SSL_ST_OK;
 540                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 541                                         s->s3->delay_buf_pop_ret=0;
 542                                         }
 543                                 }
 544                         else
 545                                 {
 546 #ifndef OPENSSL_NO_TLSEXT
 547                                 /* Allow NewSessionTicket if ticket expected */
 548                                 if (s->tlsext_ticket_expected)
 549                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 550                                 else
 551 #endif
 552
 553                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 554                                 }
 555                         s->init_num=0;
 556                         break;
 557
 558 #ifndef OPENSSL_NO_TLSEXT
 559                 case SSL3_ST_CR_SESSION_TICKET_A:
 560                 case SSL3_ST_CR_SESSION_TICKET_B:
 561                         ret=ssl3_get_new_session_ticket(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_CR_FINISHED_A;
 564                         s->init_num=0;
 565                 break;
 566
 567                 case SSL3_ST_CR_CERT_STATUS_A:
 568                 case SSL3_ST_CR_CERT_STATUS_B:
 569                         ret=ssl3_get_cert_status(s);
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 572                         s->init_num=0;
 573                 break;
 574 #endif
 575
 576                 case SSL3_ST_CR_FINISHED_A:
 577                 case SSL3_ST_CR_FINISHED_B:
 578
 579                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 580                                 SSL3_ST_CR_FINISHED_B);
 581                         if (ret <= 0) goto end;
 582
 583                         if (s->hit)
 584                                 s->state=SSL3_ST_CW_CHANGE_A;
 585                         else
 586                                 s->state=SSL_ST_OK;
 587                         s->init_num=0;
 588                         break;
 589
 590                 case SSL3_ST_CW_FLUSH:
 591                         s->rwstate=SSL_WRITING;
 592                         if (BIO_flush(s->wbio) <= 0)
 593                                 {
 594                                 ret= -1;
 595                                 goto end;
 596                                 }
 597                         s->rwstate=SSL_NOTHING;
 598                         s->state=s->s3->tmp.next_state;
 599                         break;
 600
 601                 case SSL_ST_OK:
 602                         /* clean a few things up */
 603                         ssl3_cleanup_key_block(s);
 604
 605                         if (s->init_buf != NULL)
 606                                 {
 607                                 BUF_MEM_free(s->init_buf);
 608                                 s->init_buf=NULL;
 609                                 }
 610
 611                         /* If we are not 'joining' the last two packets,
 612                          * remove the buffering now */
 613                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 614                                 ssl_free_wbio_buffer(s);
 615                         /* else do it later in ssl3_write */
 616
 617                         s->init_num=0;
 618                         s->renegotiate=0;
 619                         s->new_session=0;
 620
 621                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 622                         if (s->hit) s->ctx->stats.sess_hit++;
 623
 624                         ret=1;
 625                         /* s->server=0; */
 626                         s->handshake_func=ssl3_connect;
 627                         s->ctx->stats.sess_connect_good++;
 628
 629                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 630
 631                         goto end;
 632                         /* break; */
 633
 634                 default:
 635                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 636                         ret= -1;
 637                         goto end;
 638                         /* break; */
 639                         }
 640
 641                 /* did we do anything */
 642                 if (!s->s3->tmp.reuse_message && !skip)
 643                         {
 644                         if (s->debug)
 645                                 {
 646                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 647                                         goto end;
 648                                 }
 649
 650                         if ((cb != NULL) && (s->state != state))
 651                                 {
 652                                 new_state=s->state;
 653                                 s->state=state;
 654                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 655                                 s->state=new_state;
 656                                 }
 657                         }
 658                 skip=0;
 659                 }
 660 end:
 661         s->in_handshake--;
 662         if (buf != NULL)
 663                 BUF_MEM_free(buf);
 664         if (cb != NULL)
 665                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 666         return(ret);
 667         }
 668
 669
 670 int ssl3_client_hello(SSL *s)
 671         {
 672         unsigned char *buf;
 673         unsigned char *p,*d;
 674         int i;
 675         unsigned long Time,l;
 676 #ifndef OPENSSL_NO_COMP
 677         int j;
 678         SSL_COMP *comp;
 679 #endif
 680
 681         buf=(unsigned char *)s->init_buf->data;
 682         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 683                 {
 684                 SSL_SESSION *sess = s->session;
 685                 if ((sess == NULL) ||
 686                         (sess->ssl_version != s->version) ||
 687 #ifdef OPENSSL_NO_TLSEXT
 688                         !sess->session_id_length ||
 689 #else
 690                         (!sess->session_id_length && !sess->tlsext_tick) ||
 691 #endif
 692                         (sess->not_resumable))
 693                         {
 694                         if (!ssl_get_new_session(s,0))
 695                                 goto err;
 696                         }
 697                 /* else use the pre-loaded session */
 698
 699                 p=s->s3->client_random;
 700                 Time=(unsigned long)time(NULL);                 /* Time */
 701                 l2n(Time,p);
 702                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 703                         goto err;
 704
 705                 /* Do the message type and length last */
 706                 d=p= &(buf[4]);
 707
 708                 /* version indicates the negotiated version: for example from
 709                  * an SSLv2/v3 compatible client hello). The client_version
 710                  * field is the maximum version we permit and it is also
 711                  * used in RSA encrypted premaster secrets. Some servers can
 712                  * choke if we initially report a higher version then
 713                  * renegotiate to a lower one in the premaster secret. This
 714                  * didn't happen with TLS 1.0 as most servers supported it
 715                  * but it can with TLS 1.1 or later if the server only supports
 716                  * 1.0.
 717                  *
 718                  * Possible scenario with previous logic:
 719                  *      1. Client hello indicates TLS 1.2
 720                  *      2. Server hello says TLS 1.0
 721                  *      3. RSA encrypted premaster secret uses 1.2.
 722                  *      4. Handhaked proceeds using TLS 1.0.
 723                  *      5. Server sends hello request to renegotiate.
 724                  *      6. Client hello indicates TLS v1.0 as we now
 725                  *         know that is maximum server supports.
 726                  *      7. Server chokes on RSA encrypted premaster secret
 727                  *         containing version 1.0.
 728                  *
 729                  * For interoperability it should be OK to always use the
 730                  * maximum version we support in client hello and then rely
 731                  * on the checking of version to ensure the servers isn't
 732                  * being inconsistent: for example initially negotiating with
 733                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 734                  * client_version in client hello and not resetting it to
 735                  * the negotiated version.
 736                  */
 737 #if 0
 738                 *(p++)=s->version>>8;
 739                 *(p++)=s->version&0xff;
 740                 s->client_version=s->version;
 741 #else
 742                 *(p++)=s->client_version>>8;
 743                 *(p++)=s->client_version&0xff;
 744 #endif
 745
 746                 /* Random stuff */
 747                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 748                 p+=SSL3_RANDOM_SIZE;
 749
 750                 /* Session ID */
 751                 if (s->new_session)
 752                         i=0;
 753                 else
 754                         i=s->session->session_id_length;
 755                 *(p++)=i;
 756                 if (i != 0)
 757                         {
 758                         if (i > (int)sizeof(s->session->session_id))
 759                                 {
 760                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 761                                 goto err;
 762                                 }
 763                         memcpy(p,s->session->session_id,i);
 764                         p+=i;
 765                         }
 766
 767                 /* Ciphers supported */
 768                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 769                 if (i == 0)
 770                         {
 771                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 772                         goto err;
 773                         }
 774 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 775                         /* Some servers hang if client hello > 256 bytes
 776                          * as hack workaround chop number of supported ciphers
 777                          * to keep it well below this if we use TLS v1.2
 778                          */
 779                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 780                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 781                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 782 #endif
 783                 s2n(i,p);
 784                 p+=i;
 785
 786                 /* COMPRESSION */
 787 #ifdef OPENSSL_NO_COMP
 788                 *(p++)=1;
 789 #else
 790
 791                 if ((s->options & SSL_OP_NO_COMPRESSION)
 792                                         || !s->ctx->comp_methods)
 793                         j=0;
 794                 else
 795                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 796                 *(p++)=1+j;
 797                 for (i=0; i<j; i++)
 798                         {
 799                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 800                         *(p++)=comp->id;
 801                         }
 802 #endif
 803                 *(p++)=0; /* Add the NULL method */
 804
 805 #ifndef OPENSSL_NO_TLSEXT
 806                 /* TLS extensions*/
 807                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 808                         {
 809                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 810                         goto err;
 811                         }
 812                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 813                         {
 814                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 815                         goto err;
 816                         }
 817 #endif
 818
 819                 l=(p-d);
 820                 d=buf;
 821                 *(d++)=SSL3_MT_CLIENT_HELLO;
 822                 l2n3(l,d);
 823
 824                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 825                 /* number of bytes to write */
 826                 s->init_num=p-buf;
 827                 s->init_off=0;
 828                 }
 829
 830         /* SSL3_ST_CW_CLNT_HELLO_B */
 831         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 832 err:
 833         return(-1);
 834         }
 835
 836 int ssl3_get_server_hello(SSL *s)
 837         {
 838         STACK_OF(SSL_CIPHER) *sk;
 839         const SSL_CIPHER *c;
 840         CERT *ct = s->cert;
 841         unsigned char *p,*d;
 842         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 843         unsigned int j;
 844         long n;
 845 #ifndef OPENSSL_NO_COMP
 846         SSL_COMP *comp;
 847 #endif
 848
 849         n=s->method->ssl_get_message(s,
 850                 SSL3_ST_CR_SRVR_HELLO_A,
 851                 SSL3_ST_CR_SRVR_HELLO_B,
 852                 -1,
 853                 20000, /* ?? */
 854                 &ok);
 855
 856         if (!ok) return((int)n);
 857
 858         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 859                 {
 860                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 861                         {
 862                         if ( s->d1->send_cookie == 0)
 863                                 {
 864                                 s->s3->tmp.reuse_message = 1;
 865                                 return 1;
 866                                 }
 867                         else /* already sent a cookie */
 868                                 {
 869                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 870                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 871                                 goto f_err;
 872                                 }
 873                         }
 874                 }
 875
 876         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 877                 {
 878                 al=SSL_AD_UNEXPECTED_MESSAGE;
 879                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 880                 goto f_err;
 881                 }
 882
 883         d=p=(unsigned char *)s->init_msg;
 884
 885         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 886                 {
 887                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 888                 s->version=(s->version&0xff00)|p[1];
 889                 al=SSL_AD_PROTOCOL_VERSION;
 890                 goto f_err;
 891                 }
 892         p+=2;
 893
 894         /* load the server hello data */
 895         /* load the server random */
 896         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 897         p+=SSL3_RANDOM_SIZE;
 898
 899         /* get the session-id */
 900         j= *(p++);
 901
 902         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 903                 {
 904                 al=SSL_AD_ILLEGAL_PARAMETER;
 905                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 906                 goto f_err;
 907                 }
 908
 909 #ifndef OPENSSL_NO_TLSEXT
 910         /* check if we want to resume the session based on external pre-shared secret */
 911         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 912                 {
 913                 SSL_CIPHER *pref_cipher=NULL;
 914                 s->session->master_key_length=sizeof(s->session->master_key);
 915                 if (s->tls_session_secret_cb(s, s->session->master_key,
 916                                              &s->session->master_key_length,
 917                                              NULL, &pref_cipher,
 918                                              s->tls_session_secret_cb_arg))
 919                         {
 920                         s->session->cipher = pref_cipher ?
 921                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 922                         }
 923                 }
 924 #endif /* OPENSSL_NO_TLSEXT */
 925
 926         if (j != 0 && j == s->session->session_id_length
 927             && memcmp(p,s->session->session_id,j) == 0)
 928             {
 929             if(s->sid_ctx_length != s->session->sid_ctx_length
 930                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 931                 {
 932                 /* actually a client application bug */
 933                 al=SSL_AD_ILLEGAL_PARAMETER;
 934                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 935                 goto f_err;
 936                 }
 937             s->hit=1;
 938             }
 939         else    /* a miss or crap from the other end */
 940                 {
 941                 /* If we were trying for session-id reuse, make a new
 942                  * SSL_SESSION so we don't stuff up other people */
 943                 s->hit=0;
 944                 if (s->session->session_id_length > 0)
 945                         {
 946                         if (!ssl_get_new_session(s,0))
 947                                 {
 948                                 goto f_err;
 949                                 }
 950                         }
 951                 s->session->session_id_length=j;
 952                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 953                 }
 954         p+=j;
 955         c=ssl_get_cipher_by_char(s,p);
 956         if (c == NULL)
 957                 {
 958                 /* unknown cipher */
 959                 al=SSL_AD_ILLEGAL_PARAMETER;
 960                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 961                 goto f_err;
 962                 }
 963         /* If it is a disabled cipher we didn't send it in client hello,
 964          * so return an error.
 965          */
 966         if (c->algorithm_ssl & ct->mask_ssl ||
 967                 c->algorithm_mkey & ct->mask_k ||
 968                 c->algorithm_auth & ct->mask_a)
 969                 {
 970                 al=SSL_AD_ILLEGAL_PARAMETER;
 971                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 972                 goto f_err;
 973                 }
 974         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 975
 976         sk=ssl_get_ciphers_by_id(s);
 977         i=sk_SSL_CIPHER_find(sk,c);
 978         if (i < 0)
 979                 {
 980                 /* we did not say we would use this cipher */
 981                 al=SSL_AD_ILLEGAL_PARAMETER;
 982                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 983                 goto f_err;
 984                 }
 985
 986         /* Depending on the session caching (internal/external), the cipher
 987            and/or cipher_id values may not be set. Make sure that
 988            cipher_id is set and use it for comparison. */
 989         if (s->session->cipher)
 990                 s->session->cipher_id = s->session->cipher->id;
 991         if (s->hit && (s->session->cipher_id != c->id))
 992                 {
 993 /* Workaround is now obsolete */
 994 #if 0
 995                 if (!(s->options &
 996                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 997 #endif
 998                         {
 999                         al=SSL_AD_ILLEGAL_PARAMETER;
1000                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1001                         goto f_err;
1002                         }
1003                 }
1004         s->s3->tmp.new_cipher=c;
1005         /* Don't digest cached records if TLS v1.2: we may need them for
1006          * client authentication.
1007          */
1008         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1009                 goto f_err;
1010         /* lets get the compression algorithm */
1011         /* COMPRESSION */
1012 #ifdef OPENSSL_NO_COMP
1013         if (*(p++) != 0)
1014                 {
1015                 al=SSL_AD_ILLEGAL_PARAMETER;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1017                 goto f_err;
1018                 }
1019         /* If compression is disabled we'd better not try to resume a session
1020          * using compression.
1021          */
1022         if (s->session->compress_meth != 0)
1023                 {
1024                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1025                 goto f_err;
1026                 }
1027 #else
1028         j= *(p++);
1029         if (s->hit && j != s->session->compress_meth)
1030                 {
1031                 al=SSL_AD_ILLEGAL_PARAMETER;
1032                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1033                 goto f_err;
1034                 }
1035         if (j == 0)
1036                 comp=NULL;
1037         else if (s->options & SSL_OP_NO_COMPRESSION)
1038                 {
1039                 al=SSL_AD_ILLEGAL_PARAMETER;
1040                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1041                 goto f_err;
1042                 }
1043         else
1044                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1045
1046         if ((j != 0) && (comp == NULL))
1047                 {
1048                 al=SSL_AD_ILLEGAL_PARAMETER;
1049                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1050                 goto f_err;
1051                 }
1052         else
1053                 {
1054                 s->s3->tmp.new_compression=comp;
1055                 }
1056 #endif
1057
1058 #ifndef OPENSSL_NO_TLSEXT
1059         /* TLS extensions*/
1060         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1061                 {
1062                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1063                 goto err;
1064                 }
1065 #endif
1066
1067         if (p != (d+n))
1068                 {
1069                 /* wrong packet length */
1070                 al=SSL_AD_DECODE_ERROR;
1071                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1072                 goto f_err;
1073                 }
1074
1075         return(1);
1076 f_err:
1077         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1078 err:
1079         return(-1);
1080         }
1081
1082 int ssl3_get_server_certificate(SSL *s)
1083         {
1084         int al,i,ok,ret= -1;
1085         unsigned long n,nc,llen,l;
1086         X509 *x=NULL;
1087         const unsigned char *q,*p;
1088         unsigned char *d;
1089         STACK_OF(X509) *sk=NULL;
1090         SESS_CERT *sc;
1091         EVP_PKEY *pkey=NULL;
1092         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1093
1094         n=s->method->ssl_get_message(s,
1095                 SSL3_ST_CR_CERT_A,
1096                 SSL3_ST_CR_CERT_B,
1097                 -1,
1098                 s->max_cert_list,
1099                 &ok);
1100
1101         if (!ok) return((int)n);
1102
1103         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1104                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1105                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1106                 {
1107                 s->s3->tmp.reuse_message=1;
1108                 return(1);
1109                 }
1110
1111         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1112                 {
1113                 al=SSL_AD_UNEXPECTED_MESSAGE;
1114                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1115                 goto f_err;
1116                 }
1117         p=d=(unsigned char *)s->init_msg;
1118
1119         if ((sk=sk_X509_new_null()) == NULL)
1120                 {
1121                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1122                 goto err;
1123                 }
1124
1125         n2l3(p,llen);
1126         if (llen+3 != n)
1127                 {
1128                 al=SSL_AD_DECODE_ERROR;
1129                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1130                 goto f_err;
1131                 }
1132         for (nc=0; nc<llen; )
1133                 {
1134                 n2l3(p,l);
1135                 if ((l+nc+3) > llen)
1136                         {
1137                         al=SSL_AD_DECODE_ERROR;
1138                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1139                         goto f_err;
1140                         }
1141
1142                 q=p;
1143                 x=d2i_X509(NULL,&q,l);
1144                 if (x == NULL)
1145                         {
1146                         al=SSL_AD_BAD_CERTIFICATE;
1147                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1148                         goto f_err;
1149                         }
1150                 if (q != (p+l))
1151                         {
1152                         al=SSL_AD_DECODE_ERROR;
1153                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1154                         goto f_err;
1155                         }
1156                 if (!sk_X509_push(sk,x))
1157                         {
1158                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1159                         goto err;
1160                         }
1161                 x=NULL;
1162                 nc+=l+3;
1163                 p=q;
1164                 }
1165
1166         i=ssl_verify_cert_chain(s,sk);
1167         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1168 #ifndef OPENSSL_NO_KRB5
1169             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1170                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1171 #endif /* OPENSSL_NO_KRB5 */
1172                 )
1173                 {
1174                 al=ssl_verify_alarm_type(s->verify_result);
1175                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1176                 goto f_err;
1177                 }
1178         ERR_clear_error(); /* but we keep s->verify_result */
1179
1180         sc=ssl_sess_cert_new();
1181         if (sc == NULL) goto err;
1182
1183         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1184         s->session->sess_cert=sc;
1185
1186         sc->cert_chain=sk;
1187         /* Inconsistency alert: cert_chain does include the peer's
1188          * certificate, which we don't include in s3_srvr.c */
1189         x=sk_X509_value(sk,0);
1190         sk=NULL;
1191         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1192
1193         pkey=X509_get_pubkey(x);
1194
1195         /* VRS: allow null cert if auth == KRB5 */
1196         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1197                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1198                     ? 0 : 1;
1199
1200 #ifdef KSSL_DEBUG
1201         printf("pkey,x = %p, %p\n", pkey,x);
1202         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1203         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1204                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1205 #endif    /* KSSL_DEBUG */
1206
1207         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1208                 {
1209                 x=NULL;
1210                 al=SSL3_AL_FATAL;
1211                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1212                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1213                 goto f_err;
1214                 }
1215
1216         i=ssl_cert_type(x,pkey);
1217         if (need_cert && i < 0)
1218                 {
1219                 x=NULL;
1220                 al=SSL3_AL_FATAL;
1221                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1222                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1223                 goto f_err;
1224                 }
1225
1226         if (need_cert)
1227                 {
1228                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1229                 if (exp_idx >= 0 && i != exp_idx)
1230                         {
1231                         x=NULL;
1232                         al=SSL_AD_ILLEGAL_PARAMETER;
1233                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1234                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1235                         goto f_err;
1236                         }
1237                 sc->peer_cert_type=i;
1238                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1239                 /* Why would the following ever happen?
1240                  * We just created sc a couple of lines ago. */
1241                 if (sc->peer_pkeys[i].x509 != NULL)
1242                         X509_free(sc->peer_pkeys[i].x509);
1243                 sc->peer_pkeys[i].x509=x;
1244                 sc->peer_key= &(sc->peer_pkeys[i]);
1245
1246                 if (s->session->peer != NULL)
1247                         X509_free(s->session->peer);
1248                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1249                 s->session->peer=x;
1250                 }
1251         else
1252                 {
1253                 sc->peer_cert_type=i;
1254                 sc->peer_key= NULL;
1255
1256                 if (s->session->peer != NULL)
1257                         X509_free(s->session->peer);
1258                 s->session->peer=NULL;
1259                 }
1260         s->session->verify_result = s->verify_result;
1261
1262         x=NULL;
1263 #ifndef OPENSSL_NO_TLSEXT
1264         /* Check the audit proof. */
1265         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1266                 {
1267                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1268                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1269                 if (ret <= 0)
1270                         {
1271                         al = SSL_AD_BAD_CERTIFICATE;
1272                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1273                         goto f_err;
1274                         }
1275                 }
1276
1277 #endif
1278         ret=1;
1279         if (0)
1280                 {
1281 f_err:
1282                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1283                 }
1284 err:
1285         EVP_PKEY_free(pkey);
1286         X509_free(x);
1287         sk_X509_pop_free(sk,X509_free);
1288         return(ret);
1289         }
1290
1291 int ssl3_get_key_exchange(SSL *s)
1292         {
1293 #ifndef OPENSSL_NO_RSA
1294         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1295 #endif
1296         EVP_MD_CTX md_ctx;
1297         unsigned char *param,*p;
1298         int al,i,j,param_len,ok;
1299         long n,alg_k,alg_a;
1300         EVP_PKEY *pkey=NULL;
1301         const EVP_MD *md = NULL;
1302 #ifndef OPENSSL_NO_RSA
1303         RSA *rsa=NULL;
1304 #endif
1305 #ifndef OPENSSL_NO_DH
1306         DH *dh=NULL;
1307 #endif
1308 #ifndef OPENSSL_NO_ECDH
1309         EC_KEY *ecdh = NULL;
1310         BN_CTX *bn_ctx = NULL;
1311         EC_POINT *srvr_ecpoint = NULL;
1312         int curve_nid = 0;
1313         int encoded_pt_len = 0;
1314 #endif
1315
1316         /* use same message size as in ssl3_get_certificate_request()
1317          * as ServerKeyExchange message may be skipped */
1318         n=s->method->ssl_get_message(s,
1319                 SSL3_ST_CR_KEY_EXCH_A,
1320                 SSL3_ST_CR_KEY_EXCH_B,
1321                 -1,
1322                 s->max_cert_list,
1323                 &ok);
1324         if (!ok) return((int)n);
1325
1326         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1327                 {
1328 #ifndef OPENSSL_NO_PSK
1329                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1330                    omitted if no identity hint is sent. Set
1331                    session->sess_cert anyway to avoid problems
1332                    later.*/
1333                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1334                         {
1335                         s->session->sess_cert=ssl_sess_cert_new();
1336                         if (s->ctx->psk_identity_hint)
1337                                 OPENSSL_free(s->ctx->psk_identity_hint);
1338                         s->ctx->psk_identity_hint = NULL;
1339                         }
1340 #endif
1341                 s->s3->tmp.reuse_message=1;
1342                 return(1);
1343                 }
1344
1345         param=p=(unsigned char *)s->init_msg;
1346         if (s->session->sess_cert != NULL)
1347                 {
1348 #ifndef OPENSSL_NO_RSA
1349                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1350                         {
1351                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1352                         s->session->sess_cert->peer_rsa_tmp=NULL;
1353                         }
1354 #endif
1355 #ifndef OPENSSL_NO_DH
1356                 if (s->session->sess_cert->peer_dh_tmp)
1357                         {
1358                         DH_free(s->session->sess_cert->peer_dh_tmp);
1359                         s->session->sess_cert->peer_dh_tmp=NULL;
1360                         }
1361 #endif
1362 #ifndef OPENSSL_NO_ECDH
1363                 if (s->session->sess_cert->peer_ecdh_tmp)
1364                         {
1365                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1366                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1367                         }
1368 #endif
1369                 }
1370         else
1371                 {
1372                 s->session->sess_cert=ssl_sess_cert_new();
1373                 }
1374
1375         param_len=0;
1376         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1377         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1378         EVP_MD_CTX_init(&md_ctx);
1379
1380 #ifndef OPENSSL_NO_PSK
1381         if (alg_k & SSL_kPSK)
1382                 {
1383                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1384
1385                 al=SSL_AD_HANDSHAKE_FAILURE;
1386                 n2s(p,i);
1387                 param_len=i+2;
1388                 /* Store PSK identity hint for later use, hint is used
1389                  * in ssl3_send_client_key_exchange.  Assume that the
1390                  * maximum length of a PSK identity hint can be as
1391                  * long as the maximum length of a PSK identity. */
1392                 if (i > PSK_MAX_IDENTITY_LEN)
1393                         {
1394                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1395                                 SSL_R_DATA_LENGTH_TOO_LONG);
1396                         goto f_err;
1397                         }
1398                 if (param_len > n)
1399                         {
1400                         al=SSL_AD_DECODE_ERROR;
1401                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1402                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1403                         goto f_err;
1404                         }
1405                 /* If received PSK identity hint contains NULL
1406                  * characters, the hint is truncated from the first
1407                  * NULL. p may not be ending with NULL, so create a
1408                  * NULL-terminated string. */
1409                 memcpy(tmp_id_hint, p, i);
1410                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1411                 if (s->ctx->psk_identity_hint != NULL)
1412                         OPENSSL_free(s->ctx->psk_identity_hint);
1413                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1414                 if (s->ctx->psk_identity_hint == NULL)
1415                         {
1416                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1417                         goto f_err;
1418                         }
1419
1420                 p+=i;
1421                 n-=param_len;
1422                 }
1423         else
1424 #endif /* !OPENSSL_NO_PSK */
1425 #ifndef OPENSSL_NO_SRP
1426         if (alg_k & SSL_kSRP)
1427                 {
1428                 n2s(p,i);
1429                 param_len=i+2;
1430                 if (param_len > n)
1431                         {
1432                         al=SSL_AD_DECODE_ERROR;
1433                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1434                         goto f_err;
1435                         }
1436                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1437                         {
1438                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1439                         goto err;
1440                         }
1441                 p+=i;
1442
1443                 n2s(p,i);
1444                 param_len+=i+2;
1445                 if (param_len > n)
1446                         {
1447                         al=SSL_AD_DECODE_ERROR;
1448                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1449                         goto f_err;
1450                         }
1451                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1452                         {
1453                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1454                         goto err;
1455                         }
1456                 p+=i;
1457
1458                 i = (unsigned int)(p[0]);
1459                 p++;
1460                 param_len+=i+1;
1461                 if (param_len > n)
1462                         {
1463                         al=SSL_AD_DECODE_ERROR;
1464                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1465                         goto f_err;
1466                         }
1467                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1468                         {
1469                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1470                         goto err;
1471                         }
1472                 p+=i;
1473
1474                 n2s(p,i);
1475                 param_len+=i+2;
1476                 if (param_len > n)
1477                         {
1478                         al=SSL_AD_DECODE_ERROR;
1479                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1480                         goto f_err;
1481                         }
1482                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1483                         {
1484                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1485                         goto err;
1486                         }
1487                 p+=i;
1488                 n-=param_len;
1489
1490 /* We must check if there is a certificate */
1491 #ifndef OPENSSL_NO_RSA
1492                 if (alg_a & SSL_aRSA)
1493                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1494 #else
1495                 if (0)
1496                         ;
1497 #endif
1498 #ifndef OPENSSL_NO_DSA
1499                 else if (alg_a & SSL_aDSS)
1500                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1501 #endif
1502                 }
1503         else
1504 #endif /* !OPENSSL_NO_SRP */
1505 #ifndef OPENSSL_NO_RSA
1506         if (alg_k & SSL_kRSA)
1507                 {
1508                 if ((rsa=RSA_new()) == NULL)
1509                         {
1510                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1511                         goto err;
1512                         }
1513                 n2s(p,i);
1514                 param_len=i+2;
1515                 if (param_len > n)
1516                         {
1517                         al=SSL_AD_DECODE_ERROR;
1518                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1519                         goto f_err;
1520                         }
1521                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1522                         {
1523                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1524                         goto err;
1525                         }
1526                 p+=i;
1527
1528                 n2s(p,i);
1529                 param_len+=i+2;
1530                 if (param_len > n)
1531                         {
1532                         al=SSL_AD_DECODE_ERROR;
1533                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1534                         goto f_err;
1535                         }
1536                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1537                         {
1538                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1539                         goto err;
1540                         }
1541                 p+=i;
1542                 n-=param_len;
1543
1544                 /* this should be because we are using an export cipher */
1545                 if (alg_a & SSL_aRSA)
1546                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1547                 else
1548                         {
1549                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1550                         goto err;
1551                         }
1552                 s->session->sess_cert->peer_rsa_tmp=rsa;
1553                 rsa=NULL;
1554                 }
1555 #else /* OPENSSL_NO_RSA */
1556         if (0)
1557                 ;
1558 #endif
1559 #ifndef OPENSSL_NO_DH
1560         else if (alg_k & SSL_kEDH)
1561                 {
1562                 if ((dh=DH_new()) == NULL)
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1565                         goto err;
1566                         }
1567                 n2s(p,i);
1568                 param_len=i+2;
1569                 if (param_len > n)
1570                         {
1571                         al=SSL_AD_DECODE_ERROR;
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1573                         goto f_err;
1574                         }
1575                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1576                         {
1577                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1578                         goto err;
1579                         }
1580                 p+=i;
1581
1582                 n2s(p,i);
1583                 param_len+=i+2;
1584                 if (param_len > n)
1585                         {
1586                         al=SSL_AD_DECODE_ERROR;
1587                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1588                         goto f_err;
1589                         }
1590                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1591                         {
1592                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1593                         goto err;
1594                         }
1595                 p+=i;
1596
1597                 n2s(p,i);
1598                 param_len+=i+2;
1599                 if (param_len > n)
1600                         {
1601                         al=SSL_AD_DECODE_ERROR;
1602                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1603                         goto f_err;
1604                         }
1605                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1606                         {
1607                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1608                         goto err;
1609                         }
1610                 p+=i;
1611                 n-=param_len;
1612
1613 #ifndef OPENSSL_NO_RSA
1614                 if (alg_a & SSL_aRSA)
1615                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1616 #else
1617                 if (0)
1618                         ;
1619 #endif
1620 #ifndef OPENSSL_NO_DSA
1621                 else if (alg_a & SSL_aDSS)
1622                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1623 #endif
1624                 /* else anonymous DH, so no certificate or pkey. */
1625
1626                 s->session->sess_cert->peer_dh_tmp=dh;
1627                 dh=NULL;
1628                 }
1629         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1630                 {
1631                 al=SSL_AD_ILLEGAL_PARAMETER;
1632                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1633                 goto f_err;
1634                 }
1635 #endif /* !OPENSSL_NO_DH */
1636
1637 #ifndef OPENSSL_NO_ECDH
1638         else if (alg_k & SSL_kEECDH)
1639                 {
1640                 EC_GROUP *ngroup;
1641                 const EC_GROUP *group;
1642
1643                 if ((ecdh=EC_KEY_new()) == NULL)
1644                         {
1645                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1646                         goto err;
1647                         }
1648
1649                 /* Extract elliptic curve parameters and the
1650                  * server's ephemeral ECDH public key.
1651                  * Keep accumulating lengths of various components in
1652                  * param_len and make sure it never exceeds n.
1653                  */
1654
1655                 /* XXX: For now we only support named (not generic) curves
1656                  * and the ECParameters in this case is just three bytes.
1657                  */
1658                 param_len=3;
1659                 /* Check curve is one of our prefrences, if not server has
1660                  * sent an invalid curve.
1661                  */
1662                 if (!tls1_check_curve(s, p, param_len))
1663                         {
1664                         al=SSL_AD_DECODE_ERROR;
1665                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1666                         goto f_err;
1667                         }
1668
1669                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1670                         {
1671                         al=SSL_AD_INTERNAL_ERROR;
1672                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1673                         goto f_err;
1674                         }
1675
1676                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1677                 if (ngroup == NULL)
1678                         {
1679                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1680                         goto err;
1681                         }
1682                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1683                         {
1684                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1685                         goto err;
1686                         }
1687                 EC_GROUP_free(ngroup);
1688
1689                 group = EC_KEY_get0_group(ecdh);
1690
1691                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1692                     (EC_GROUP_get_degree(group) > 163))
1693                         {
1694                         al=SSL_AD_EXPORT_RESTRICTION;
1695                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1696                         goto f_err;
1697                         }
1698
1699                 p+=3;
1700
1701                 /* Next, get the encoded ECPoint */
1702                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1703                     ((bn_ctx = BN_CTX_new()) == NULL))
1704                         {
1705                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1706                         goto err;
1707                         }
1708
1709                 encoded_pt_len = *p;  /* length of encoded point */
1710                 p+=1;
1711                 param_len += (1 + encoded_pt_len);
1712                 if ((param_len > n) ||
1713                     (EC_POINT_oct2point(group, srvr_ecpoint,
1714                         p, encoded_pt_len, bn_ctx) == 0))
1715                         {
1716                         al=SSL_AD_DECODE_ERROR;
1717                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1718                         goto f_err;
1719                         }
1720
1721                 n-=param_len;
1722                 p+=encoded_pt_len;
1723
1724                 /* The ECC/TLS specification does not mention
1725                  * the use of DSA to sign ECParameters in the server
1726                  * key exchange message. We do support RSA and ECDSA.
1727                  */
1728                 if (0) ;
1729 #ifndef OPENSSL_NO_RSA
1730                 else if (alg_a & SSL_aRSA)
1731                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1732 #endif
1733 #ifndef OPENSSL_NO_ECDSA
1734                 else if (alg_a & SSL_aECDSA)
1735                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1736 #endif
1737                 /* else anonymous ECDH, so no certificate or pkey. */
1738                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1739                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1740                 ecdh=NULL;
1741                 BN_CTX_free(bn_ctx);
1742                 bn_ctx = NULL;
1743                 EC_POINT_free(srvr_ecpoint);
1744                 srvr_ecpoint = NULL;
1745                 }
1746         else if (alg_k)
1747                 {
1748                 al=SSL_AD_UNEXPECTED_MESSAGE;
1749                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1750                 goto f_err;
1751                 }
1752 #endif /* !OPENSSL_NO_ECDH */
1753
1754
1755         /* p points to the next byte, there are 'n' bytes left */
1756
1757         /* if it was signed, check the signature */
1758         if (pkey != NULL)
1759                 {
1760                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1761                         {
1762                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1763                         if (rv == -1)
1764                                 goto err;
1765                         else if (rv == 0)
1766                                 {
1767                                 al = SSL_AD_DECODE_ERROR;
1768                                 goto f_err;
1769                                 }
1770 #ifdef SSL_DEBUG
1771 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1772 #endif
1773                         p += 2;
1774                         n -= 2;
1775                         }
1776                 else
1777                         md = EVP_sha1();
1778
1779                 n2s(p,i);
1780                 n-=2;
1781                 j=EVP_PKEY_size(pkey);
1782
1783                 if ((i != n) || (n > j) || (n <= 0))
1784                         {
1785                         /* wrong packet length */
1786                         al=SSL_AD_DECODE_ERROR;
1787                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1788                         goto f_err;
1789                         }
1790
1791 #ifndef OPENSSL_NO_RSA
1792                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1793                         {
1794                         int num;
1795
1796                         j=0;
1797                         q=md_buf;
1798                         for (num=2; num > 0; num--)
1799                                 {
1800                                 EVP_MD_CTX_set_flags(&md_ctx,
1801                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1802                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1803                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1804                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1805                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1806                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1807                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1808                                 q+=i;
1809                                 j+=i;
1810                                 }
1811                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1812                                                                 pkey->pkey.rsa);
1813                         if (i < 0)
1814                                 {
1815                                 al=SSL_AD_DECRYPT_ERROR;
1816                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1817                                 goto f_err;
1818                                 }
1819                         if (i == 0)
1820                                 {
1821                                 /* bad signature */
1822                                 al=SSL_AD_DECRYPT_ERROR;
1823                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1824                                 goto f_err;
1825                                 }
1826                         }
1827                 else
1828 #endif
1829                         {
1830                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1831                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1832                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1833                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1834                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1835                                 {
1836                                 /* bad signature */
1837                                 al=SSL_AD_DECRYPT_ERROR;
1838                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1839                                 goto f_err;
1840                                 }
1841                         }
1842                 }
1843         else
1844                 {
1845                 /* aNULL or kPSK do not need public keys */
1846                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1847                         {
1848                         /* Might be wrong key type, check it */
1849                         if (ssl3_check_cert_and_algorithm(s))
1850                                 /* Otherwise this shouldn't happen */
1851                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1852                         goto err;
1853                         }
1854                 /* still data left over */
1855                 if (n != 0)
1856                         {
1857                         al=SSL_AD_DECODE_ERROR;
1858                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1859                         goto f_err;
1860                         }
1861                 }
1862         EVP_PKEY_free(pkey);
1863         EVP_MD_CTX_cleanup(&md_ctx);
1864         return(1);
1865 f_err:
1866         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1867 err:
1868         EVP_PKEY_free(pkey);
1869 #ifndef OPENSSL_NO_RSA
1870         if (rsa != NULL)
1871                 RSA_free(rsa);
1872 #endif
1873 #ifndef OPENSSL_NO_DH
1874         if (dh != NULL)
1875                 DH_free(dh);
1876 #endif
1877 #ifndef OPENSSL_NO_ECDH
1878         BN_CTX_free(bn_ctx);
1879         EC_POINT_free(srvr_ecpoint);
1880         if (ecdh != NULL)
1881                 EC_KEY_free(ecdh);
1882 #endif
1883         EVP_MD_CTX_cleanup(&md_ctx);
1884         return(-1);
1885         }
1886
1887 int ssl3_get_certificate_request(SSL *s)
1888         {
1889         int ok,ret=0;
1890         unsigned long n,nc,l;
1891         unsigned int llen, ctype_num,i;
1892         X509_NAME *xn=NULL;
1893         const unsigned char *p,*q;
1894         unsigned char *d;
1895         STACK_OF(X509_NAME) *ca_sk=NULL;
1896
1897         n=s->method->ssl_get_message(s,
1898                 SSL3_ST_CR_CERT_REQ_A,
1899                 SSL3_ST_CR_CERT_REQ_B,
1900                 -1,
1901                 s->max_cert_list,
1902                 &ok);
1903
1904         if (!ok) return((int)n);
1905
1906         s->s3->tmp.cert_req=0;
1907
1908         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1909                 {
1910                 s->s3->tmp.reuse_message=1;
1911                 /* If we get here we don't need any cached handshake records
1912                  * as we wont be doing client auth.
1913                  */
1914                 if (s->s3->handshake_buffer)
1915                         {
1916                         if (!ssl3_digest_cached_records(s))
1917                                 goto err;
1918                         }
1919                 return(1);
1920                 }
1921
1922         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1923                 {
1924                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1925                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1926                 goto err;
1927                 }
1928
1929         /* TLS does not like anon-DH with client cert */
1930         if (s->version > SSL3_VERSION)
1931                 {
1932                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1933                         {
1934                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1935                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1936                         goto err;
1937                         }
1938                 }
1939
1940         p=d=(unsigned char *)s->init_msg;
1941
1942         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1943                 {
1944                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1945                 goto err;
1946                 }
1947
1948         /* get the certificate types */
1949         ctype_num= *(p++);
1950         if (s->cert->ctypes)
1951                 {
1952                 OPENSSL_free(s->cert->ctypes);
1953                 s->cert->ctypes = NULL;
1954                 }
1955         if (ctype_num > SSL3_CT_NUMBER)
1956                 {
1957                 /* If we exceed static buffer copy all to cert structure */
1958                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1959                 memcpy(s->cert->ctypes, p, ctype_num);
1960                 s->cert->ctype_num = (size_t)ctype_num;
1961                 ctype_num=SSL3_CT_NUMBER;
1962                 }
1963         for (i=0; i<ctype_num; i++)
1964                 s->s3->tmp.ctype[i]= p[i];
1965         p+=p[-1];
1966         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1967                 {
1968                 n2s(p, llen);
1969                 /* Check we have enough room for signature algorithms and
1970                  * following length value.
1971                  */
1972                 if ((unsigned long)(p - d + llen + 2) > n)
1973                         {
1974                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1975                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1976                         goto err;
1977                         }
1978                 /* Clear certificate digests and validity flags */
1979                 for (i = 0; i < SSL_PKEY_NUM; i++)
1980                         {
1981                         s->cert->pkeys[i].digest = NULL;
1982                         s->cert->pkeys[i].valid_flags = 0;
1983                         }
1984                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1985                         {
1986                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1987                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1988                         goto err;
1989                         }
1990                 p += llen;
1991                 }
1992
1993         /* get the CA RDNs */
1994         n2s(p,llen);
1995 #if 0
1996 {
1997 FILE *out;
1998 out=fopen("/tmp/vsign.der","w");
1999 fwrite(p,1,llen,out);
2000 fclose(out);
2001 }
2002 #endif
2003
2004         if ((unsigned long)(p - d + llen) != n)
2005                 {
2006                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2007                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2008                 goto err;
2009                 }
2010
2011         for (nc=0; nc<llen; )
2012                 {
2013                 n2s(p,l);
2014                 if ((l+nc+2) > llen)
2015                         {
2016                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2017                                 goto cont; /* netscape bugs */
2018                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2019                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2020                         goto err;
2021                         }
2022
2023                 q=p;
2024
2025                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2026                         {
2027                         /* If netscape tolerance is on, ignore errors */
2028                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2029                                 goto cont;
2030                         else
2031                                 {
2032                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2033                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2034                                 goto err;
2035                                 }
2036                         }
2037
2038                 if (q != (p+l))
2039                         {
2040                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2041                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2042                         goto err;
2043                         }
2044                 if (!sk_X509_NAME_push(ca_sk,xn))
2045                         {
2046                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2047                         goto err;
2048                         }
2049
2050                 p+=l;
2051                 nc+=l+2;
2052                 }
2053
2054         if (0)
2055                 {
2056 cont:
2057                 ERR_clear_error();
2058                 }
2059
2060         /* we should setup a certificate to return.... */
2061         s->s3->tmp.cert_req=1;
2062         s->s3->tmp.ctype_num=ctype_num;
2063         if (s->s3->tmp.ca_names != NULL)
2064                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2065         s->s3->tmp.ca_names=ca_sk;
2066         ca_sk=NULL;
2067
2068         ret=1;
2069 err:
2070         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2071         return(ret);
2072         }
2073
2074 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2075         {
2076         return(X509_NAME_cmp(*a,*b));
2077         }
2078 #ifndef OPENSSL_NO_TLSEXT
2079 int ssl3_get_new_session_ticket(SSL *s)
2080         {
2081         int ok,al,ret=0, ticklen;
2082         long n;
2083         const unsigned char *p;
2084         unsigned char *d;
2085
2086         n=s->method->ssl_get_message(s,
2087                 SSL3_ST_CR_SESSION_TICKET_A,
2088                 SSL3_ST_CR_SESSION_TICKET_B,
2089                 -1,
2090                 16384,
2091                 &ok);
2092
2093         if (!ok)
2094                 return((int)n);
2095
2096         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2097                 {
2098                 s->s3->tmp.reuse_message=1;
2099                 return(1);
2100                 }
2101         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2102                 {
2103                 al=SSL_AD_UNEXPECTED_MESSAGE;
2104                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2105                 goto f_err;
2106                 }
2107         if (n < 6)
2108                 {
2109                 /* need at least ticket_lifetime_hint + ticket length */
2110                 al = SSL_AD_DECODE_ERROR;
2111                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2112                 goto f_err;
2113                 }
2114
2115         p=d=(unsigned char *)s->init_msg;
2116         n2l(p, s->session->tlsext_tick_lifetime_hint);
2117         n2s(p, ticklen);
2118         /* ticket_lifetime_hint + ticket_length + ticket */
2119         if (ticklen + 6 != n)
2120                 {
2121                 al = SSL_AD_DECODE_ERROR;
2122                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2123                 goto f_err;
2124                 }
2125         if (s->session->tlsext_tick)
2126                 {
2127                 OPENSSL_free(s->session->tlsext_tick);
2128                 s->session->tlsext_ticklen = 0;
2129                 }
2130         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2131         if (!s->session->tlsext_tick)
2132                 {
2133                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2134                 goto err;
2135                 }
2136         memcpy(s->session->tlsext_tick, p, ticklen);
2137         s->session->tlsext_ticklen = ticklen;
2138         /* There are two ways to detect a resumed ticket sesion.
2139          * One is to set an appropriate session ID and then the server
2140          * must return a match in ServerHello. This allows the normal
2141          * client session ID matching to work and we know much
2142          * earlier that the ticket has been accepted.
2143          *
2144          * The other way is to set zero length session ID when the
2145          * ticket is presented and rely on the handshake to determine
2146          * session resumption.
2147          *
2148          * We choose the former approach because this fits in with
2149          * assumptions elsewhere in OpenSSL. The session ID is set
2150          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2151          * ticket.
2152          */
2153         EVP_Digest(p, ticklen,
2154                         s->session->session_id, &s->session->session_id_length,
2155 #ifndef OPENSSL_NO_SHA256
2156                                                         EVP_sha256(), NULL);
2157 #else
2158                                                         EVP_sha1(), NULL);
2159 #endif
2160         ret=1;
2161         return(ret);
2162 f_err:
2163         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2164 err:
2165         return(-1);
2166         }
2167
2168 int ssl3_get_cert_status(SSL *s)
2169         {
2170         int ok, al;
2171         unsigned long resplen,n;
2172         const unsigned char *p;
2173
2174         n=s->method->ssl_get_message(s,
2175                 SSL3_ST_CR_CERT_STATUS_A,
2176                 SSL3_ST_CR_CERT_STATUS_B,
2177                 SSL3_MT_CERTIFICATE_STATUS,
2178                 16384,
2179                 &ok);
2180
2181         if (!ok) return((int)n);
2182         if (n < 4)
2183                 {
2184                 /* need at least status type + length */
2185                 al = SSL_AD_DECODE_ERROR;
2186                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2187                 goto f_err;
2188                 }
2189         p = (unsigned char *)s->init_msg;
2190         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2191                 {
2192                 al = SSL_AD_DECODE_ERROR;
2193                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2194                 goto f_err;
2195                 }
2196         n2l3(p, resplen);
2197         if (resplen + 4 != n)
2198                 {
2199                 al = SSL_AD_DECODE_ERROR;
2200                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2201                 goto f_err;
2202                 }
2203         if (s->tlsext_ocsp_resp)
2204                 OPENSSL_free(s->tlsext_ocsp_resp);
2205         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2206         if (!s->tlsext_ocsp_resp)
2207                 {
2208                 al = SSL_AD_INTERNAL_ERROR;
2209                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2210                 goto f_err;
2211                 }
2212         s->tlsext_ocsp_resplen = resplen;
2213         if (s->ctx->tlsext_status_cb)
2214                 {
2215                 int ret;
2216                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2217                 if (ret == 0)
2218                         {
2219                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2220                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2221                         goto f_err;
2222                         }
2223                 if (ret < 0)
2224                         {
2225                         al = SSL_AD_INTERNAL_ERROR;
2226                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2227                         goto f_err;
2228                         }
2229                 }
2230         return 1;
2231 f_err:
2232         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2233         return(-1);
2234         }
2235 #endif
2236
2237 int ssl3_get_server_done(SSL *s)
2238         {
2239         int ok,ret=0;
2240         long n;
2241
2242         n=s->method->ssl_get_message(s,
2243                 SSL3_ST_CR_SRVR_DONE_A,
2244                 SSL3_ST_CR_SRVR_DONE_B,
2245                 SSL3_MT_SERVER_DONE,
2246                 30, /* should be very small, like 0 :-) */
2247                 &ok);
2248
2249         if (!ok) return((int)n);
2250         if (n > 0)
2251                 {
2252                 /* should contain no data */
2253                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2254                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2255                 return -1;
2256                 }
2257         ret=1;
2258         return(ret);
2259         }
2260
2261
2262 int ssl3_send_client_key_exchange(SSL *s)
2263         {
2264         unsigned char *p,*d;
2265         int n;
2266         unsigned long alg_k;
2267 #ifndef OPENSSL_NO_RSA
2268         unsigned char *q;
2269         EVP_PKEY *pkey=NULL;
2270 #endif
2271 #ifndef OPENSSL_NO_KRB5
2272         KSSL_ERR kssl_err;
2273 #endif /* OPENSSL_NO_KRB5 */
2274 #ifndef OPENSSL_NO_ECDH
2275         EC_KEY *clnt_ecdh = NULL;
2276         const EC_POINT *srvr_ecpoint = NULL;
2277         EVP_PKEY *srvr_pub_pkey = NULL;
2278         unsigned char *encodedPoint = NULL;
2279         int encoded_pt_len = 0;
2280         BN_CTX * bn_ctx = NULL;
2281 #endif
2282
2283         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2284                 {
2285                 d=(unsigned char *)s->init_buf->data;
2286                 p= &(d[4]);
2287
2288                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2289
2290                 /* Fool emacs indentation */
2291                 if (0) {}
2292 #ifndef OPENSSL_NO_RSA
2293                 else if (alg_k & SSL_kRSA)
2294                         {
2295                         RSA *rsa;
2296                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2297
2298                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2299                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2300                         else
2301                                 {
2302                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2303                                 if ((pkey == NULL) ||
2304                                         (pkey->type != EVP_PKEY_RSA) ||
2305                                         (pkey->pkey.rsa == NULL))
2306                                         {
2307                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2308                                         goto err;
2309                                         }
2310                                 rsa=pkey->pkey.rsa;
2311                                 EVP_PKEY_free(pkey);
2312                                 }
2313
2314                         tmp_buf[0]=s->client_version>>8;
2315                         tmp_buf[1]=s->client_version&0xff;
2316                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2317                                         goto err;
2318
2319                         s->session->master_key_length=sizeof tmp_buf;
2320
2321                         q=p;
2322                         /* Fix buf for TLS and beyond */
2323                         if (s->version > SSL3_VERSION)
2324                                 p+=2;
2325                         n=RSA_public_encrypt(sizeof tmp_buf,
2326                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2327 #ifdef PKCS1_CHECK
2328                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2329                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2330 #endif
2331                         if (n <= 0)
2332                                 {
2333                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2334                                 goto err;
2335                                 }
2336
2337                         /* Fix buf for TLS and beyond */
2338                         if (s->version > SSL3_VERSION)
2339                                 {
2340                                 s2n(n,q);
2341                                 n+=2;
2342                                 }
2343
2344                         s->session->master_key_length=
2345                                 s->method->ssl3_enc->generate_master_secret(s,
2346                                         s->session->master_key,
2347                                         tmp_buf,sizeof tmp_buf);
2348                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2349                         }
2350 #endif
2351 #ifndef OPENSSL_NO_KRB5
2352                 else if (alg_k & SSL_kKRB5)
2353                         {
2354                         krb5_error_code krb5rc;
2355                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2356                         /*  krb5_data   krb5_ap_req;  */
2357                         krb5_data       *enc_ticket;
2358                         krb5_data       authenticator, *authp = NULL;
2359                         EVP_CIPHER_CTX  ciph_ctx;
2360                         const EVP_CIPHER *enc = NULL;
2361                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2362                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2363                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2364                                                 + EVP_MAX_IV_LENGTH];
2365                         int             padl, outl = sizeof(epms);
2366
2367                         EVP_CIPHER_CTX_init(&ciph_ctx);
2368
2369 #ifdef KSSL_DEBUG
2370                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2371                                 alg_k, SSL_kKRB5);
2372 #endif  /* KSSL_DEBUG */
2373
2374                         authp = NULL;
2375 #ifdef KRB5SENDAUTH
2376                         if (KRB5SENDAUTH)  authp = &authenticator;
2377 #endif  /* KRB5SENDAUTH */
2378
2379                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2380                                 &kssl_err);
2381                         enc = kssl_map_enc(kssl_ctx->enctype);
2382                         if (enc == NULL)
2383                             goto err;
2384 #ifdef KSSL_DEBUG
2385                         {
2386                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2387                         if (krb5rc && kssl_err.text)
2388                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2389                         }
2390 #endif  /* KSSL_DEBUG */
2391
2392                         if (krb5rc)
2393                                 {
2394                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2395                                                 SSL_AD_HANDSHAKE_FAILURE);
2396                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2397                                                 kssl_err.reason);
2398                                 goto err;
2399                                 }
2400
2401                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2402                         **  in place of RFC 2712 KerberosWrapper, as in:
2403                         **
2404                         **  Send ticket (copy to *p, set n = length)
2405                         **  n = krb5_ap_req.length;
2406                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2407                         **  if (krb5_ap_req.data)
2408                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2409                         **
2410                         **  Now using real RFC 2712 KerberosWrapper
2411                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2412                         **  Note: 2712 "opaque" types are here replaced
2413                         **  with a 2-byte length followed by the value.
2414                         **  Example:
2415                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2416                         **  Where "xx xx" = length bytes.  Shown here with
2417                         **  optional authenticator omitted.
2418                         */
2419
2420                         /*  KerberosWrapper.Ticket              */
2421                         s2n(enc_ticket->length,p);
2422                         memcpy(p, enc_ticket->data, enc_ticket->length);
2423                         p+= enc_ticket->length;
2424                         n = enc_ticket->length + 2;
2425
2426                         /*  KerberosWrapper.Authenticator       */
2427                         if (authp  &&  authp->length)
2428                                 {
2429                                 s2n(authp->length,p);
2430                                 memcpy(p, authp->data, authp->length);
2431                                 p+= authp->length;
2432                                 n+= authp->length + 2;
2433
2434                                 free(authp->data);
2435                                 authp->data = NULL;
2436                                 authp->length = 0;
2437                                 }
2438                         else
2439                                 {
2440                                 s2n(0,p);/*  null authenticator length  */
2441                                 n+=2;
2442                                 }
2443
2444                             tmp_buf[0]=s->client_version>>8;
2445                             tmp_buf[1]=s->client_version&0xff;
2446                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2447                                 goto err;
2448
2449                         /*  20010420 VRS.  Tried it this way; failed.
2450                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2451                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2452                         **                              kssl_ctx->length);
2453                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2454                         */
2455
2456                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2457                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2458                                 kssl_ctx->key,iv);
2459                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2460                                 sizeof tmp_buf);
2461                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2462                         outl += padl;
2463                         if (outl > (int)sizeof epms)
2464                                 {
2465                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2466                                 goto err;
2467                                 }
2468                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2469
2470                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2471                         s2n(outl,p);
2472                         memcpy(p, epms, outl);
2473                         p+=outl;
2474                         n+=outl + 2;
2475
2476                         s->session->master_key_length=
2477                                 s->method->ssl3_enc->generate_master_secret(s,
2478                                         s->session->master_key,
2479                                         tmp_buf, sizeof tmp_buf);
2480
2481                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2482                         OPENSSL_cleanse(epms, outl);
2483                         }
2484 #endif
2485 #ifndef OPENSSL_NO_DH
2486                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2487                         {
2488                         DH *dh_srvr,*dh_clnt;
2489                         SESS_CERT *scert = s->session->sess_cert;
2490
2491                         if (scert == NULL)
2492                                 {
2493                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2494                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2495                                 goto err;
2496                                 }
2497
2498                         if (scert->peer_dh_tmp != NULL)
2499                                 dh_srvr=scert->peer_dh_tmp;
2500                         else
2501                                 {
2502                                 /* we get them from the cert */
2503                                 int idx = scert->peer_cert_type;
2504                                 EVP_PKEY *spkey = NULL;
2505                                 dh_srvr = NULL;
2506                                 if (idx >= 0)
2507                                         spkey = X509_get_pubkey(
2508                                                 scert->peer_pkeys[idx].x509);
2509                                 if (spkey)
2510                                         {
2511                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2512                                         EVP_PKEY_free(spkey);
2513                                         }
2514                                 if (dh_srvr == NULL)
2515                                         {
2516                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2517                                             ERR_R_INTERNAL_ERROR);
2518                                         goto err;
2519                                         }
2520                                 }
2521                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2522                                 {
2523                                 /* Use client certificate key */
2524                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2525                                 dh_clnt = NULL;
2526                                 if (clkey)
2527                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2528                                 if (dh_clnt == NULL)
2529                                         {
2530                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2531                                             ERR_R_INTERNAL_ERROR);
2532                                         goto err;
2533                                         }
2534                                 }
2535                         else
2536                                 {
2537                                 /* generate a new random key */
2538                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2539                                         {
2540                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2541                                         goto err;
2542                                         }
2543                                 if (!DH_generate_key(dh_clnt))
2544                                         {
2545                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2546                                         DH_free(dh_clnt);
2547                                         goto err;
2548                                         }
2549                                 }
2550
2551                         /* use the 'p' output buffer for the DH key, but
2552                          * make sure to clear it out afterwards */
2553
2554                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2555                         if (scert->peer_dh_tmp == NULL)
2556                                 DH_free(dh_srvr);
2557
2558                         if (n <= 0)
2559                                 {
2560                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2561                                 DH_free(dh_clnt);
2562                                 goto err;
2563                                 }
2564
2565                         /* generate master key from the result */
2566                         s->session->master_key_length=
2567                                 s->method->ssl3_enc->generate_master_secret(s,
2568                                         s->session->master_key,p,n);
2569                         /* clean up */
2570                         memset(p,0,n);
2571
2572                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2573                                 n = 0;
2574                         else
2575                                 {
2576                                 /* send off the data */
2577                                 n=BN_num_bytes(dh_clnt->pub_key);
2578                                 s2n(n,p);
2579                                 BN_bn2bin(dh_clnt->pub_key,p);
2580                                 n+=2;
2581                                 }
2582
2583                         DH_free(dh_clnt);
2584
2585                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2586                         }
2587 #endif
2588
2589 #ifndef OPENSSL_NO_ECDH
2590                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2591                         {
2592                         const EC_GROUP *srvr_group = NULL;
2593                         EC_KEY *tkey;
2594                         int ecdh_clnt_cert = 0;
2595                         int field_size = 0;
2596
2597                         /* Did we send out the client's
2598                          * ECDH share for use in premaster
2599                          * computation as part of client certificate?
2600                          * If so, set ecdh_clnt_cert to 1.
2601                          */
2602                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2603                                 {
2604                                 /* XXX: For now, we do not support client
2605                                  * authentication using ECDH certificates.
2606                                  * To add such support, one needs to add
2607                                  * code that checks for appropriate
2608                                  * conditions and sets ecdh_clnt_cert to 1.
2609                                  * For example, the cert have an ECC
2610                                  * key on the same curve as the server's
2611                                  * and the key should be authorized for
2612                                  * key agreement.
2613                                  *
2614                                  * One also needs to add code in ssl3_connect
2615                                  * to skip sending the certificate verify
2616                                  * message.
2617                                  *
2618                                  * if ((s->cert->key->privatekey != NULL) &&
2619                                  *     (s->cert->key->privatekey->type ==
2620                                  *      EVP_PKEY_EC) && ...)
2621                                  * ecdh_clnt_cert = 1;
2622                                  */
2623                                 }
2624
2625                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2626                                 {
2627                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2628                                 }
2629                         else
2630                                 {
2631                                 /* Get the Server Public Key from Cert */
2632                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2633                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2634                                 if ((srvr_pub_pkey == NULL) ||
2635                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2636                                     (srvr_pub_pkey->pkey.ec == NULL))
2637                                         {
2638                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2639                                             ERR_R_INTERNAL_ERROR);
2640                                         goto err;
2641                                         }
2642
2643                                 tkey = srvr_pub_pkey->pkey.ec;
2644                                 }
2645
2646                         srvr_group   = EC_KEY_get0_group(tkey);
2647                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2648
2649                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2650                                 {
2651                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2652                                     ERR_R_INTERNAL_ERROR);
2653                                 goto err;
2654                                 }
2655
2656                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2657                                 {
2658                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2659                                 goto err;
2660                                 }
2661
2662                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2663                                 {
2664                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2665                                 goto err;
2666                                 }
2667                         if (ecdh_clnt_cert)
2668                                 {
2669                                 /* Reuse key info from our certificate
2670                                  * We only need our private key to perform
2671                                  * the ECDH computation.
2672                                  */
2673                                 const BIGNUM *priv_key;
2674                                 tkey = s->cert->key->privatekey->pkey.ec;
2675                                 priv_key = EC_KEY_get0_private_key(tkey);
2676                                 if (priv_key == NULL)
2677                                         {
2678                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2679                                         goto err;
2680                                         }
2681                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2682                                         {
2683                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2684                                         goto err;
2685                                         }
2686                                 }
2687                         else
2688                                 {
2689                                 /* Generate a new ECDH key pair */
2690                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2691                                         {
2692                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2693                                         goto err;
2694                                         }
2695                                 }
2696
2697                         /* use the 'p' output buffer for the ECDH key, but
2698                          * make sure to clear it out afterwards
2699                          */
2700
2701                         field_size = EC_GROUP_get_degree(srvr_group);
2702                         if (field_size <= 0)
2703                                 {
2704                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2705                                        ERR_R_ECDH_LIB);
2706                                 goto err;
2707                                 }
2708                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2709                         if (n <= 0)
2710                                 {
2711                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2712                                        ERR_R_ECDH_LIB);
2713                                 goto err;
2714                                 }
2715
2716                         /* generate master key from the result */
2717                         s->session->master_key_length = s->method->ssl3_enc \
2718                             -> generate_master_secret(s,
2719                                 s->session->master_key,
2720                                 p, n);
2721
2722                         memset(p, 0, n); /* clean up */
2723
2724                         if (ecdh_clnt_cert)
2725                                 {
2726                                 /* Send empty client key exch message */
2727                                 n = 0;
2728                                 }
2729                         else
2730                                 {
2731                                 /* First check the size of encoding and
2732                                  * allocate memory accordingly.
2733                                  */
2734                                 encoded_pt_len =
2735                                     EC_POINT_point2oct(srvr_group,
2736                                         EC_KEY_get0_public_key(clnt_ecdh),
2737                                         POINT_CONVERSION_UNCOMPRESSED,
2738                                         NULL, 0, NULL);
2739
2740                                 encodedPoint = (unsigned char *)
2741                                     OPENSSL_malloc(encoded_pt_len *
2742                                         sizeof(unsigned char));
2743                                 bn_ctx = BN_CTX_new();
2744                                 if ((encodedPoint == NULL) ||
2745                                     (bn_ctx == NULL))
2746                                         {
2747                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2748                                         goto err;
2749                                         }
2750
2751                                 /* Encode the public key */
2752                                 n = EC_POINT_point2oct(srvr_group,
2753                                     EC_KEY_get0_public_key(clnt_ecdh),
2754                                     POINT_CONVERSION_UNCOMPRESSED,
2755                                     encodedPoint, encoded_pt_len, bn_ctx);
2756
2757                                 *p = n; /* length of encoded point */
2758                                 /* Encoded point will be copied here */
2759                                 p += 1;
2760                                 /* copy the point */
2761                                 memcpy((unsigned char *)p, encodedPoint, n);
2762                                 /* increment n to account for length field */
2763                                 n += 1;
2764                                 }
2765
2766                         /* Free allocated memory */
2767                         BN_CTX_free(bn_ctx);
2768                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2769                         if (clnt_ecdh != NULL)
2770                                  EC_KEY_free(clnt_ecdh);
2771                         EVP_PKEY_free(srvr_pub_pkey);
2772                         }
2773 #endif /* !OPENSSL_NO_ECDH */
2774                 else if (alg_k & SSL_kGOST)
2775                         {
2776                         /* GOST key exchange message creation */
2777                         EVP_PKEY_CTX *pkey_ctx;
2778                         X509 *peer_cert;
2779                         size_t msglen;
2780                         unsigned int md_len;
2781                         int keytype;
2782                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2783                         EVP_MD_CTX *ukm_hash;
2784                         EVP_PKEY *pub_key;
2785
2786                         /* Get server sertificate PKEY and create ctx from it */
2787                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2788                         if (!peer_cert)
2789                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2790                         if (!peer_cert)         {
2791                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2792                                         goto err;
2793                                 }
2794
2795                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2796                         /* If we have send a certificate, and certificate key
2797
2798                          * parameters match those of server certificate, use
2799                          * certificate key for key exchange
2800                          */
2801
2802                          /* Otherwise, generate ephemeral key pair */
2803
2804                         EVP_PKEY_encrypt_init(pkey_ctx);
2805                           /* Generate session key */
2806                     RAND_bytes(premaster_secret,32);
2807                         /* If we have client certificate, use its secret as peer key */
2808                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2809                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2810                                         /* If there was an error - just ignore it. Ephemeral key
2811                                         * would be used
2812                                         */
2813                                         ERR_clear_error();
2814                                 }
2815                         }
2816                         /* Compute shared IV and store it in algorithm-specific
2817                          * context data */
2818                         ukm_hash = EVP_MD_CTX_create();
2819                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2820                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2821                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2822                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2823                         EVP_MD_CTX_destroy(ukm_hash);
2824                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2825                                 8,shared_ukm)<0) {
2826                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2827                                                 SSL_R_LIBRARY_BUG);
2828                                         goto err;
2829                                 }
2830                         /* Make GOST keytransport blob message */
2831                         /*Encapsulate it into sequence */
2832                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2833                         msglen=255;
2834                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2835                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2836                                         SSL_R_LIBRARY_BUG);
2837                                 goto err;
2838                         }
2839                         if (msglen >= 0x80)
2840                                 {
2841                                 *(p++)=0x81;
2842                                 *(p++)= msglen & 0xff;
2843                                 n=msglen+3;
2844                                 }
2845                         else
2846                                 {
2847                                 *(p++)= msglen & 0xff;
2848                                 n=msglen+2;
2849                                 }
2850                         memcpy(p, tmp, msglen);
2851                         /* Check if pubkey from client certificate was used */
2852                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2853                                 {
2854                                 /* Set flag "skip certificate verify" */
2855                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2856                                 }
2857                         EVP_PKEY_CTX_free(pkey_ctx);
2858                         s->session->master_key_length=
2859                                 s->method->ssl3_enc->generate_master_secret(s,
2860                                         s->session->master_key,premaster_secret,32);
2861                         EVP_PKEY_free(pub_key);
2862
2863                         }
2864 #ifndef OPENSSL_NO_SRP
2865                 else if (alg_k & SSL_kSRP)
2866                         {
2867                         if (s->srp_ctx.A != NULL)
2868                                 {
2869                                 /* send off the data */
2870                                 n=BN_num_bytes(s->srp_ctx.A);
2871                                 s2n(n,p);
2872                                 BN_bn2bin(s->srp_ctx.A,p);
2873                                 n+=2;
2874                                 }
2875                         else
2876                                 {
2877                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2878                                 goto err;
2879                                 }
2880                         if (s->session->srp_username != NULL)
2881                                 OPENSSL_free(s->session->srp_username);
2882                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2883                         if (s->session->srp_username == NULL)
2884                                 {
2885                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2886                                         ERR_R_MALLOC_FAILURE);
2887                                 goto err;
2888                                 }
2889
2890                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2891                                 {
2892                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2893                                 goto err;
2894                                 }
2895                         }
2896 #endif
2897 #ifndef OPENSSL_NO_PSK
2898                 else if (alg_k & SSL_kPSK)
2899                         {
2900                         char identity[PSK_MAX_IDENTITY_LEN];
2901                         unsigned char *t = NULL;
2902                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2903                         unsigned int pre_ms_len = 0, psk_len = 0;
2904                         int psk_err = 1;
2905
2906                         n = 0;
2907                         if (s->psk_client_callback == NULL)
2908                                 {
2909                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2910                                         SSL_R_PSK_NO_CLIENT_CB);
2911                                 goto err;
2912                                 }
2913
2914                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2915                                 identity, PSK_MAX_IDENTITY_LEN,
2916                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2917                         if (psk_len > PSK_MAX_PSK_LEN)
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2920                                         ERR_R_INTERNAL_ERROR);
2921                                 goto psk_err;
2922                                 }
2923                         else if (psk_len == 0)
2924                                 {
2925                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2926                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2927                                 goto psk_err;
2928                                 }
2929
2930                         /* create PSK pre_master_secret */
2931                         pre_ms_len = 2+psk_len+2+psk_len;
2932                         t = psk_or_pre_ms;
2933                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2934                         s2n(psk_len, t);
2935                         memset(t, 0, psk_len);
2936                         t+=psk_len;
2937                         s2n(psk_len, t);
2938
2939                         if (s->session->psk_identity_hint != NULL)
2940                                 OPENSSL_free(s->session->psk_identity_hint);
2941                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2942                         if (s->ctx->psk_identity_hint != NULL &&
2943                                 s->session->psk_identity_hint == NULL)
2944                                 {
2945                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2946                                         ERR_R_MALLOC_FAILURE);
2947                                 goto psk_err;
2948                                 }
2949
2950                         if (s->session->psk_identity != NULL)
2951                                 OPENSSL_free(s->session->psk_identity);
2952                         s->session->psk_identity = BUF_strdup(identity);
2953                         if (s->session->psk_identity == NULL)
2954                                 {
2955                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2956                                         ERR_R_MALLOC_FAILURE);
2957                                 goto psk_err;
2958                                 }
2959
2960                         s->session->master_key_length =
2961                                 s->method->ssl3_enc->generate_master_secret(s,
2962                                         s->session->master_key,
2963                                         psk_or_pre_ms, pre_ms_len);
2964                         n = strlen(identity);
2965                         s2n(n, p);
2966                         memcpy(p, identity, n);
2967                         n+=2;
2968                         psk_err = 0;
2969                 psk_err:
2970                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2971                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2972                         if (psk_err != 0)
2973                                 {
2974                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2975                                 goto err;
2976                                 }
2977                         }
2978 #endif
2979                 else
2980                         {
2981                         ssl3_send_alert(s, SSL3_AL_FATAL,
2982                             SSL_AD_HANDSHAKE_FAILURE);
2983                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2984                             ERR_R_INTERNAL_ERROR);
2985                         goto err;
2986                         }
2987
2988                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2989                 l2n3(n,d);
2990
2991                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2992                 /* number of bytes to write */
2993                 s->init_num=n+4;
2994                 s->init_off=0;
2995                 }
2996
2997         /* SSL3_ST_CW_KEY_EXCH_B */
2998         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2999 err:
3000 #ifndef OPENSSL_NO_ECDH
3001         BN_CTX_free(bn_ctx);
3002         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3003         if (clnt_ecdh != NULL)
3004                 EC_KEY_free(clnt_ecdh);
3005         EVP_PKEY_free(srvr_pub_pkey);
3006 #endif
3007         return(-1);
3008         }
3009
3010 int ssl3_send_client_verify(SSL *s)
3011         {
3012         unsigned char *p,*d;
3013         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3014         EVP_PKEY *pkey;
3015         EVP_PKEY_CTX *pctx=NULL;
3016         EVP_MD_CTX mctx;
3017         unsigned u=0;
3018         unsigned long n;
3019         int j;
3020
3021         EVP_MD_CTX_init(&mctx);
3022
3023         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3024                 {
3025                 d=(unsigned char *)s->init_buf->data;
3026                 p= &(d[4]);
3027                 pkey=s->cert->key->privatekey;
3028 /* Create context from key and test if sha1 is allowed as digest */
3029                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3030                 EVP_PKEY_sign_init(pctx);
3031                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3032                         {
3033                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3034                                 s->method->ssl3_enc->cert_verify_mac(s,
3035                                                 NID_sha1,
3036                                                 &(data[MD5_DIGEST_LENGTH]));
3037                         }
3038                 else
3039                         {
3040                         ERR_clear_error();
3041                         }
3042                 /* For TLS v1.2 send signature algorithm and signature
3043                  * using agreed digest and cached handshake records.
3044                  */
3045                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3046                         {
3047                         long hdatalen = 0;
3048                         void *hdata;
3049                         const EVP_MD *md = s->cert->key->digest;
3050                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3051                                                                 &hdata);
3052                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3053                                 {
3054                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3055                                                 ERR_R_INTERNAL_ERROR);
3056                                 goto err;
3057                                 }
3058                         p += 2;
3059 #ifdef SSL_DEBUG
3060                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3061                                                         EVP_MD_name(md));
3062 #endif
3063                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3064                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3065                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3066                                 {
3067                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3068                                                 ERR_R_EVP_LIB);
3069                                 goto err;
3070                                 }
3071                         s2n(u,p);
3072                         n = u + 4;
3073                         if (!ssl3_digest_cached_records(s))
3074                                 goto err;
3075                         }
3076                 else
3077 #ifndef OPENSSL_NO_RSA
3078                 if (pkey->type == EVP_PKEY_RSA)
3079                         {
3080                         s->method->ssl3_enc->cert_verify_mac(s,
3081                                 NID_md5,
3082                                 &(data[0]));
3083                         if (RSA_sign(NID_md5_sha1, data,
3084                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3085                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3086                                 {
3087                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3088                                 goto err;
3089                                 }
3090                         s2n(u,p);
3091                         n=u+2;
3092                         }
3093                 else
3094 #endif
3095 #ifndef OPENSSL_NO_DSA
3096                         if (pkey->type == EVP_PKEY_DSA)
3097                         {
3098                         if (!DSA_sign(pkey->save_type,
3099                                 &(data[MD5_DIGEST_LENGTH]),
3100                                 SHA_DIGEST_LENGTH,&(p[2]),
3101                                 (unsigned int *)&j,pkey->pkey.dsa))
3102                                 {
3103                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3104                                 goto err;
3105                                 }
3106                         s2n(j,p);
3107                         n=j+2;
3108                         }
3109                 else
3110 #endif
3111 #ifndef OPENSSL_NO_ECDSA
3112                         if (pkey->type == EVP_PKEY_EC)
3113                         {
3114                         if (!ECDSA_sign(pkey->save_type,
3115                                 &(data[MD5_DIGEST_LENGTH]),
3116                                 SHA_DIGEST_LENGTH,&(p[2]),
3117                                 (unsigned int *)&j,pkey->pkey.ec))
3118                                 {
3119                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3120                                     ERR_R_ECDSA_LIB);
3121                                 goto err;
3122                                 }
3123                         s2n(j,p);
3124                         n=j+2;
3125                         }
3126                 else
3127 #endif
3128                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3129                 {
3130                 unsigned char signbuf[64];
3131                 int i;
3132                 size_t sigsize=64;
3133                 s->method->ssl3_enc->cert_verify_mac(s,
3134                         NID_id_GostR3411_94,
3135                         data);
3136                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3137                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3138                         ERR_R_INTERNAL_ERROR);
3139                         goto err;
3140                 }
3141                 for (i=63,j=0; i>=0; j++, i--) {
3142                         p[2+j]=signbuf[i];
3143                 }
3144                 s2n(j,p);
3145                 n=j+2;
3146                 }
3147                 else
3148                 {
3149                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3150                         goto err;
3151                 }
3152                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3153                 l2n3(n,d);
3154
3155                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3156                 s->init_num=(int)n+4;
3157                 s->init_off=0;
3158                 }
3159         EVP_MD_CTX_cleanup(&mctx);
3160         EVP_PKEY_CTX_free(pctx);
3161         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3162 err:
3163         EVP_MD_CTX_cleanup(&mctx);
3164         EVP_PKEY_CTX_free(pctx);
3165         return(-1);
3166         }
3167
3168 /* Check a certificate can be used for client authentication. Currently
3169  * check cert exists, if we have a suitable digest for TLS 1.2 if
3170  * static DH client certificates can be used and optionally checks
3171  * suitability for Suite B.
3172  */
3173 static int ssl3_check_client_certificate(SSL *s)
3174         {
3175         unsigned long alg_k;
3176         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3177                 return 0;
3178         /* If no suitable signature algorithm can't use certificate */
3179         if (TLS1_get_version(s) >= TLS1_2_VERSION && !s->cert->key->digest)
3180                 return 0;
3181         /* If strict mode check suitability of chain before using it.
3182          * This also adjusts suite B digest if necessary.
3183          */
3184         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3185                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3186                 return 0;
3187         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3188         /* See if we can use client certificate for fixed DH */
3189         if (alg_k & (SSL_kDHr|SSL_kDHd))
3190                 {
3191                 SESS_CERT *scert = s->session->sess_cert;
3192                 int i = scert->peer_cert_type;
3193                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3194                 clkey = s->cert->key->privatekey;
3195                 /* If client key not DH assume it can be used */
3196                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3197                         return 1;
3198                 if (i >= 0)
3199                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3200                 if (spkey)
3201                         {
3202                         /* Compare server and client parameters */
3203                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3204                         EVP_PKEY_free(spkey);
3205                         if (i != 1)
3206                                 return 0;
3207                         }
3208                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3209                 }
3210         return 1;
3211         }
3212
3213 int ssl3_send_client_certificate(SSL *s)
3214         {
3215         X509 *x509=NULL;
3216         EVP_PKEY *pkey=NULL;
3217         int i;
3218         unsigned long l;
3219
3220         if (s->state == SSL3_ST_CW_CERT_A)
3221                 {
3222                 /* Let cert callback update client certificates if required */
3223                 if (s->cert->cert_cb
3224                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3225                         {
3226                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3227                         return 0;
3228                         }
3229                 if (ssl3_check_client_certificate(s))
3230                         s->state=SSL3_ST_CW_CERT_C;
3231                 else
3232                         s->state=SSL3_ST_CW_CERT_B;
3233                 }
3234
3235         /* We need to get a client cert */
3236         if (s->state == SSL3_ST_CW_CERT_B)
3237                 {
3238                 /* If we get an error, we need to
3239                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3240                  * We then get retied later */
3241                 i=0;
3242                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3243                 if (i < 0)
3244                         {
3245                         s->rwstate=SSL_X509_LOOKUP;
3246                         return(-1);
3247                         }
3248                 s->rwstate=SSL_NOTHING;
3249                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3250                         {
3251                         s->state=SSL3_ST_CW_CERT_B;
3252                         if (    !SSL_use_certificate(s,x509) ||
3253                                 !SSL_use_PrivateKey(s,pkey))
3254                                 i=0;
3255                         }
3256                 else if (i == 1)
3257                         {
3258                         i=0;
3259                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3260                         }
3261
3262                 if (x509 != NULL) X509_free(x509);
3263                 if (pkey != NULL) EVP_PKEY_free(pkey);
3264                 if (i && !ssl3_check_client_certificate(s))
3265                         i = 0;
3266                 if (i == 0)
3267                         {
3268                         if (s->version == SSL3_VERSION)
3269                                 {
3270                                 s->s3->tmp.cert_req=0;
3271                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3272                                 return(1);
3273                                 }
3274                         else
3275                                 {
3276                                 s->s3->tmp.cert_req=2;
3277                                 }
3278                         }
3279
3280                 /* Ok, we have a cert */
3281                 s->state=SSL3_ST_CW_CERT_C;
3282                 }
3283
3284         if (s->state == SSL3_ST_CW_CERT_C)
3285                 {
3286                 s->state=SSL3_ST_CW_CERT_D;
3287                 l=ssl3_output_cert_chain(s,
3288                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3289                 s->init_num=(int)l;
3290                 s->init_off=0;
3291                 }
3292         /* SSL3_ST_CW_CERT_D */
3293         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3294         }
3295
3296 #define has_bits(i,m)   (((i)&(m)) == (m))
3297
3298 int ssl3_check_cert_and_algorithm(SSL *s)
3299         {
3300         int i,idx;
3301         long alg_k,alg_a;
3302         EVP_PKEY *pkey=NULL;
3303         SESS_CERT *sc;
3304 #ifndef OPENSSL_NO_RSA
3305         RSA *rsa;
3306 #endif
3307 #ifndef OPENSSL_NO_DH
3308         DH *dh;
3309 #endif
3310
3311         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3312         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3313
3314         /* we don't have a certificate */
3315         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3316                 return(1);
3317
3318         sc=s->session->sess_cert;
3319         if (sc == NULL)
3320                 {
3321                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3322                 goto err;
3323                 }
3324
3325 #ifndef OPENSSL_NO_RSA
3326         rsa=s->session->sess_cert->peer_rsa_tmp;
3327 #endif
3328 #ifndef OPENSSL_NO_DH
3329         dh=s->session->sess_cert->peer_dh_tmp;
3330 #endif
3331
3332         /* This is the passed certificate */
3333
3334         idx=sc->peer_cert_type;
3335 #ifndef OPENSSL_NO_ECDH
3336         if (idx == SSL_PKEY_ECC)
3337                 {
3338                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3339                                                                 s) == 0)
3340                         { /* check failed */
3341                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3342                         goto f_err;
3343                         }
3344                 else
3345                         {
3346                         return 1;
3347                         }
3348                 }
3349         else if (alg_a & SSL_aECDSA)
3350                 {
3351                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3352                 goto f_err;
3353                 }
3354         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3355                 {
3356                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3357                 goto f_err;
3358                 }
3359 #endif
3360         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3361         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3362         EVP_PKEY_free(pkey);
3363
3364
3365         /* Check that we have a certificate if we require one */
3366         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3367                 {
3368                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3369                 goto f_err;
3370                 }
3371 #ifndef OPENSSL_NO_DSA
3372         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3373                 {
3374                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3375                 goto f_err;
3376                 }
3377 #endif
3378 #ifndef OPENSSL_NO_RSA
3379         if ((alg_k & SSL_kRSA) &&
3380                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3381                 {
3382                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3383                 goto f_err;
3384                 }
3385 #endif
3386 #ifndef OPENSSL_NO_DH
3387         if ((alg_k & SSL_kEDH) &&
3388                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3389                 {
3390                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3391                 goto f_err;
3392                 }
3393         else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3394                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3395                 {
3396                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3397                 goto f_err;
3398                 }
3399 #ifndef OPENSSL_NO_DSA
3400         else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3401                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3402                 {
3403                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3404                 goto f_err;
3405                 }
3406 #endif
3407 #endif
3408
3409         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3410                 {
3411 #ifndef OPENSSL_NO_RSA
3412                 if (alg_k & SSL_kRSA)
3413                         {
3414                         if (rsa == NULL
3415                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3416                                 {
3417                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3418                                 goto f_err;
3419                                 }
3420                         }
3421                 else
3422 #endif
3423 #ifndef OPENSSL_NO_DH
3424                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3425                             {
3426                             if (dh == NULL
3427                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3428                                 {
3429                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3430                                 goto f_err;
3431                                 }
3432                         }
3433                 else
3434 #endif
3435                         {
3436                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3437                         goto f_err;
3438                         }
3439                 }
3440         return(1);
3441 f_err:
3442         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3443 err:
3444         return(0);
3445         }
3446
3447 /* Check to see if handshake is full or resumed. Usually this is just a
3448  * case of checking to see if a cache hit has occurred. In the case of
3449  * session tickets we have to check the next message to be sure.
3450  */
3451
3452 #ifndef OPENSSL_NO_TLSEXT
3453 # ifndef OPENSSL_NO_NEXTPROTONEG
3454 int ssl3_send_next_proto(SSL *s)
3455         {
3456         unsigned int len, padding_len;
3457         unsigned char *d;
3458
3459         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3460                 {
3461                 len = s->next_proto_negotiated_len;
3462                 padding_len = 32 - ((len + 2) % 32);
3463                 d = (unsigned char *)s->init_buf->data;
3464                 d[4] = len;
3465                 memcpy(d + 5, s->next_proto_negotiated, len);
3466                 d[5 + len] = padding_len;
3467                 memset(d + 6 + len, 0, padding_len);
3468                 *(d++)=SSL3_MT_NEXT_PROTO;
3469                 l2n3(2 + len + padding_len, d);
3470                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3471                 s->init_num = 4 + 2 + len + padding_len;
3472                 s->init_off = 0;
3473                 }
3474
3475         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3476         }
3477 # endif
3478
3479 int ssl3_check_finished(SSL *s)
3480         {
3481         int ok;
3482         long n;
3483         /* If we have no ticket it cannot be a resumed session. */
3484         if (!s->session->tlsext_tick)
3485                 return 1;
3486         /* this function is called when we really expect a Certificate
3487          * message, so permit appropriate message length */
3488         n=s->method->ssl_get_message(s,
3489                 SSL3_ST_CR_CERT_A,
3490                 SSL3_ST_CR_CERT_B,
3491                 -1,
3492                 s->max_cert_list,
3493                 &ok);
3494         if (!ok) return((int)n);
3495         s->s3->tmp.reuse_message = 1;
3496         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3497                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3498                 return 2;
3499
3500         return 1;
3501         }
3502 #endif
3503
3504 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3505         {
3506         int i = 0;
3507 #ifndef OPENSSL_NO_ENGINE
3508         if (s->ctx->client_cert_engine)
3509                 {
3510                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3511                                                 SSL_get_client_CA_list(s),
3512                                                 px509, ppkey, NULL, NULL, NULL);
3513                 if (i != 0)
3514                         return i;
3515                 }
3516 #endif
3517         if (s->ctx->client_cert_cb)
3518                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3519         return i;
3520         }
3521
3522 #ifndef OPENSSL_NO_TLSEXT
3523 int tls1_get_server_supplemental_data(SSL *s)
3524         {
3525         int al;
3526         int ok;
3527         unsigned long supp_data_len, authz_data_len;
3528         long n;
3529         unsigned short supp_data_type, authz_data_type, proof_len;
3530         const unsigned char *p;
3531         unsigned char *new_proof;
3532
3533         n=s->method->ssl_get_message(s,
3534                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3535                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3536                 SSL3_MT_SUPPLEMENTAL_DATA,
3537                 /* use default limit */
3538                 TLSEXT_MAXLEN_supplemental_data,
3539                 &ok);
3540
3541         if (!ok) return((int)n);
3542
3543         p = (unsigned char *)s->init_msg;
3544
3545         /* The message cannot be empty */
3546         if (n < 3)
3547                 {
3548                 al = SSL_AD_DECODE_ERROR;
3549                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3550                 goto f_err;
3551                 }
3552         /* Length of supplemental data */
3553         n2l3(p,supp_data_len);
3554         n -= 3;
3555         /* We must have at least one supplemental data entry
3556          * with type (1 byte) and length (2 bytes). */
3557         if (supp_data_len != (unsigned long) n || n < 4)
3558                 {
3559                 al = SSL_AD_DECODE_ERROR;
3560                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3561                 goto f_err;
3562                 }
3563         /* Supplemental data type: must be authz_data */
3564         n2s(p,supp_data_type);
3565         n -= 2;
3566         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3567                 {
3568                 al = SSL_AD_UNEXPECTED_MESSAGE;
3569                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3570                 goto f_err;
3571                 }
3572         /* Authz data length */
3573         n2s(p, authz_data_len);
3574         n -= 2;
3575         if (authz_data_len != (unsigned long) n || n < 1)
3576                 {
3577                 al = SSL_AD_DECODE_ERROR;
3578                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3579                 goto f_err;
3580                 }
3581         /* Authz data type: must be audit_proof */
3582         authz_data_type = *(p++);
3583         n -= 1;
3584         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3585                 {
3586                 al=SSL_AD_UNEXPECTED_MESSAGE;
3587                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3588                 goto f_err;
3589                 }
3590         /* We have a proof: read its length */
3591         if (n < 2)
3592                 {
3593                 al = SSL_AD_DECODE_ERROR;
3594                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3595                 goto f_err;
3596                 }
3597         n2s(p, proof_len);
3598         n -= 2;
3599         if (proof_len != (unsigned long) n)
3600                 {
3601                 al = SSL_AD_DECODE_ERROR;
3602                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3603                 goto f_err;
3604                 }
3605         /* Store the proof */
3606         new_proof = OPENSSL_realloc(s->session->audit_proof,
3607                                     proof_len);
3608         if (new_proof == NULL)
3609                 {
3610                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3611                 return 0;
3612                 }
3613         s->session->audit_proof_length = proof_len;
3614         s->session->audit_proof = new_proof;
3615         memcpy(s->session->audit_proof, p, proof_len);
3616
3617         /* Got the proof, but can't verify it yet. */
3618         return 1;
3619 f_err:
3620         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3621         return -1;
3622         }
3623 #endif