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
1280         if (0)
1281                 {
1282 f_err:
1283                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1284                 }
1285 err:
1286         EVP_PKEY_free(pkey);
1287         X509_free(x);
1288         sk_X509_pop_free(sk,X509_free);
1289         return(ret);
1290         }
1291
1292 int ssl3_get_key_exchange(SSL *s)
1293         {
1294 #ifndef OPENSSL_NO_RSA
1295         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1296 #endif
1297         EVP_MD_CTX md_ctx;
1298         unsigned char *param,*p;
1299         int al,i,j,param_len,ok;
1300         long n,alg_k,alg_a;
1301         EVP_PKEY *pkey=NULL;
1302         const EVP_MD *md = NULL;
1303 #ifndef OPENSSL_NO_RSA
1304         RSA *rsa=NULL;
1305 #endif
1306 #ifndef OPENSSL_NO_DH
1307         DH *dh=NULL;
1308 #endif
1309 #ifndef OPENSSL_NO_ECDH
1310         EC_KEY *ecdh = NULL;
1311         BN_CTX *bn_ctx = NULL;
1312         EC_POINT *srvr_ecpoint = NULL;
1313         int curve_nid = 0;
1314         int encoded_pt_len = 0;
1315 #endif
1316
1317         /* use same message size as in ssl3_get_certificate_request()
1318          * as ServerKeyExchange message may be skipped */
1319         n=s->method->ssl_get_message(s,
1320                 SSL3_ST_CR_KEY_EXCH_A,
1321                 SSL3_ST_CR_KEY_EXCH_B,
1322                 -1,
1323                 s->max_cert_list,
1324                 &ok);
1325         if (!ok) return((int)n);
1326
1327         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1328                 {
1329 #ifndef OPENSSL_NO_PSK
1330                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1331                    omitted if no identity hint is sent. Set
1332                    session->sess_cert anyway to avoid problems
1333                    later.*/
1334                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1335                         {
1336                         s->session->sess_cert=ssl_sess_cert_new();
1337                         if (s->ctx->psk_identity_hint)
1338                                 OPENSSL_free(s->ctx->psk_identity_hint);
1339                         s->ctx->psk_identity_hint = NULL;
1340                         }
1341 #endif
1342                 s->s3->tmp.reuse_message=1;
1343                 return(1);
1344                 }
1345
1346         param=p=(unsigned char *)s->init_msg;
1347         if (s->session->sess_cert != NULL)
1348                 {
1349 #ifndef OPENSSL_NO_RSA
1350                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1351                         {
1352                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1353                         s->session->sess_cert->peer_rsa_tmp=NULL;
1354                         }
1355 #endif
1356 #ifndef OPENSSL_NO_DH
1357                 if (s->session->sess_cert->peer_dh_tmp)
1358                         {
1359                         DH_free(s->session->sess_cert->peer_dh_tmp);
1360                         s->session->sess_cert->peer_dh_tmp=NULL;
1361                         }
1362 #endif
1363 #ifndef OPENSSL_NO_ECDH
1364                 if (s->session->sess_cert->peer_ecdh_tmp)
1365                         {
1366                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1367                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1368                         }
1369 #endif
1370                 }
1371         else
1372                 {
1373                 s->session->sess_cert=ssl_sess_cert_new();
1374                 }
1375
1376         param_len=0;
1377         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1378         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1379         EVP_MD_CTX_init(&md_ctx);
1380
1381 #ifndef OPENSSL_NO_PSK
1382         if (alg_k & SSL_kPSK)
1383                 {
1384                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1385
1386                 al=SSL_AD_HANDSHAKE_FAILURE;
1387                 n2s(p,i);
1388                 param_len=i+2;
1389                 /* Store PSK identity hint for later use, hint is used
1390                  * in ssl3_send_client_key_exchange.  Assume that the
1391                  * maximum length of a PSK identity hint can be as
1392                  * long as the maximum length of a PSK identity. */
1393                 if (i > PSK_MAX_IDENTITY_LEN)
1394                         {
1395                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1396                                 SSL_R_DATA_LENGTH_TOO_LONG);
1397                         goto f_err;
1398                         }
1399                 if (param_len > n)
1400                         {
1401                         al=SSL_AD_DECODE_ERROR;
1402                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1403                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1404                         goto f_err;
1405                         }
1406                 /* If received PSK identity hint contains NULL
1407                  * characters, the hint is truncated from the first
1408                  * NULL. p may not be ending with NULL, so create a
1409                  * NULL-terminated string. */
1410                 memcpy(tmp_id_hint, p, i);
1411                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1412                 if (s->ctx->psk_identity_hint != NULL)
1413                         OPENSSL_free(s->ctx->psk_identity_hint);
1414                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1415                 if (s->ctx->psk_identity_hint == NULL)
1416                         {
1417                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1418                         goto f_err;
1419                         }
1420
1421                 p+=i;
1422                 n-=param_len;
1423                 }
1424         else
1425 #endif /* !OPENSSL_NO_PSK */
1426 #ifndef OPENSSL_NO_SRP
1427         if (alg_k & SSL_kSRP)
1428                 {
1429                 n2s(p,i);
1430                 param_len=i+2;
1431                 if (param_len > n)
1432                         {
1433                         al=SSL_AD_DECODE_ERROR;
1434                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1435                         goto f_err;
1436                         }
1437                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1438                         {
1439                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1440                         goto err;
1441                         }
1442                 p+=i;
1443
1444                 n2s(p,i);
1445                 param_len+=i+2;
1446                 if (param_len > n)
1447                         {
1448                         al=SSL_AD_DECODE_ERROR;
1449                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1450                         goto f_err;
1451                         }
1452                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1453                         {
1454                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1455                         goto err;
1456                         }
1457                 p+=i;
1458
1459                 i = (unsigned int)(p[0]);
1460                 p++;
1461                 param_len+=i+1;
1462                 if (param_len > n)
1463                         {
1464                         al=SSL_AD_DECODE_ERROR;
1465                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1466                         goto f_err;
1467                         }
1468                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1469                         {
1470                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1471                         goto err;
1472                         }
1473                 p+=i;
1474
1475                 n2s(p,i);
1476                 param_len+=i+2;
1477                 if (param_len > n)
1478                         {
1479                         al=SSL_AD_DECODE_ERROR;
1480                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1481                         goto f_err;
1482                         }
1483                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1484                         {
1485                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1486                         goto err;
1487                         }
1488                 p+=i;
1489                 n-=param_len;
1490
1491 /* We must check if there is a certificate */
1492 #ifndef OPENSSL_NO_RSA
1493                 if (alg_a & SSL_aRSA)
1494                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1495 #else
1496                 if (0)
1497                         ;
1498 #endif
1499 #ifndef OPENSSL_NO_DSA
1500                 else if (alg_a & SSL_aDSS)
1501                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1502 #endif
1503                 }
1504         else
1505 #endif /* !OPENSSL_NO_SRP */
1506 #ifndef OPENSSL_NO_RSA
1507         if (alg_k & SSL_kRSA)
1508                 {
1509                 if ((rsa=RSA_new()) == NULL)
1510                         {
1511                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1512                         goto err;
1513                         }
1514                 n2s(p,i);
1515                 param_len=i+2;
1516                 if (param_len > n)
1517                         {
1518                         al=SSL_AD_DECODE_ERROR;
1519                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1520                         goto f_err;
1521                         }
1522                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1523                         {
1524                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1525                         goto err;
1526                         }
1527                 p+=i;
1528
1529                 n2s(p,i);
1530                 param_len+=i+2;
1531                 if (param_len > n)
1532                         {
1533                         al=SSL_AD_DECODE_ERROR;
1534                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1535                         goto f_err;
1536                         }
1537                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1538                         {
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1540                         goto err;
1541                         }
1542                 p+=i;
1543                 n-=param_len;
1544
1545                 /* this should be because we are using an export cipher */
1546                 if (alg_a & SSL_aRSA)
1547                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1548                 else
1549                         {
1550                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1551                         goto err;
1552                         }
1553                 s->session->sess_cert->peer_rsa_tmp=rsa;
1554                 rsa=NULL;
1555                 }
1556 #else /* OPENSSL_NO_RSA */
1557         if (0)
1558                 ;
1559 #endif
1560 #ifndef OPENSSL_NO_DH
1561         else if (alg_k & SSL_kEDH)
1562                 {
1563                 if ((dh=DH_new()) == NULL)
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1566                         goto err;
1567                         }
1568                 n2s(p,i);
1569                 param_len=i+2;
1570                 if (param_len > n)
1571                         {
1572                         al=SSL_AD_DECODE_ERROR;
1573                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1574                         goto f_err;
1575                         }
1576                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1577                         {
1578                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1579                         goto err;
1580                         }
1581                 p+=i;
1582
1583                 n2s(p,i);
1584                 param_len+=i+2;
1585                 if (param_len > n)
1586                         {
1587                         al=SSL_AD_DECODE_ERROR;
1588                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1589                         goto f_err;
1590                         }
1591                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1592                         {
1593                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1594                         goto err;
1595                         }
1596                 p+=i;
1597
1598                 n2s(p,i);
1599                 param_len+=i+2;
1600                 if (param_len > n)
1601                         {
1602                         al=SSL_AD_DECODE_ERROR;
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1604                         goto f_err;
1605                         }
1606                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1607                         {
1608                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1609                         goto err;
1610                         }
1611                 p+=i;
1612                 n-=param_len;
1613
1614 #ifndef OPENSSL_NO_RSA
1615                 if (alg_a & SSL_aRSA)
1616                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1617 #else
1618                 if (0)
1619                         ;
1620 #endif
1621 #ifndef OPENSSL_NO_DSA
1622                 else if (alg_a & SSL_aDSS)
1623                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1624 #endif
1625                 /* else anonymous DH, so no certificate or pkey. */
1626
1627                 s->session->sess_cert->peer_dh_tmp=dh;
1628                 dh=NULL;
1629                 }
1630         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1631                 {
1632                 al=SSL_AD_ILLEGAL_PARAMETER;
1633                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1634                 goto f_err;
1635                 }
1636 #endif /* !OPENSSL_NO_DH */
1637
1638 #ifndef OPENSSL_NO_ECDH
1639         else if (alg_k & SSL_kEECDH)
1640                 {
1641                 EC_GROUP *ngroup;
1642                 const EC_GROUP *group;
1643
1644                 if ((ecdh=EC_KEY_new()) == NULL)
1645                         {
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1647                         goto err;
1648                         }
1649
1650                 /* Extract elliptic curve parameters and the
1651                  * server's ephemeral ECDH public key.
1652                  * Keep accumulating lengths of various components in
1653                  * param_len and make sure it never exceeds n.
1654                  */
1655
1656                 /* XXX: For now we only support named (not generic) curves
1657                  * and the ECParameters in this case is just three bytes.
1658                  */
1659                 param_len=3;
1660                 /* Check curve is one of our prefrences, if not server has
1661                  * sent an invalid curve.
1662                  */
1663                 if (!tls1_check_curve(s, p, param_len))
1664                         {
1665                         al=SSL_AD_DECODE_ERROR;
1666                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1667                         goto f_err;
1668                         }
1669
1670                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1671                         {
1672                         al=SSL_AD_INTERNAL_ERROR;
1673                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1674                         goto f_err;
1675                         }
1676
1677                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1678                 if (ngroup == NULL)
1679                         {
1680                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1681                         goto err;
1682                         }
1683                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1686                         goto err;
1687                         }
1688                 EC_GROUP_free(ngroup);
1689
1690                 group = EC_KEY_get0_group(ecdh);
1691
1692                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1693                     (EC_GROUP_get_degree(group) > 163))
1694                         {
1695                         al=SSL_AD_EXPORT_RESTRICTION;
1696                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1697                         goto f_err;
1698                         }
1699
1700                 p+=3;
1701
1702                 /* Next, get the encoded ECPoint */
1703                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1704                     ((bn_ctx = BN_CTX_new()) == NULL))
1705                         {
1706                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1707                         goto err;
1708                         }
1709
1710                 encoded_pt_len = *p;  /* length of encoded point */
1711                 p+=1;
1712                 param_len += (1 + encoded_pt_len);
1713                 if ((param_len > n) ||
1714                     (EC_POINT_oct2point(group, srvr_ecpoint,
1715                         p, encoded_pt_len, bn_ctx) == 0))
1716                         {
1717                         al=SSL_AD_DECODE_ERROR;
1718                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1719                         goto f_err;
1720                         }
1721
1722                 n-=param_len;
1723                 p+=encoded_pt_len;
1724
1725                 /* The ECC/TLS specification does not mention
1726                  * the use of DSA to sign ECParameters in the server
1727                  * key exchange message. We do support RSA and ECDSA.
1728                  */
1729                 if (0) ;
1730 #ifndef OPENSSL_NO_RSA
1731                 else if (alg_a & SSL_aRSA)
1732                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1733 #endif
1734 #ifndef OPENSSL_NO_ECDSA
1735                 else if (alg_a & SSL_aECDSA)
1736                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1737 #endif
1738                 /* else anonymous ECDH, so no certificate or pkey. */
1739                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1740                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1741                 ecdh=NULL;
1742                 BN_CTX_free(bn_ctx);
1743                 bn_ctx = NULL;
1744                 EC_POINT_free(srvr_ecpoint);
1745                 srvr_ecpoint = NULL;
1746                 }
1747         else if (alg_k)
1748                 {
1749                 al=SSL_AD_UNEXPECTED_MESSAGE;
1750                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1751                 goto f_err;
1752                 }
1753 #endif /* !OPENSSL_NO_ECDH */
1754
1755
1756         /* p points to the next byte, there are 'n' bytes left */
1757
1758         /* if it was signed, check the signature */
1759         if (pkey != NULL)
1760                 {
1761                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1762                         {
1763                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1764                         if (rv == -1)
1765                                 goto err;
1766                         else if (rv == 0)
1767                                 {
1768                                 al = SSL_AD_DECODE_ERROR;
1769                                 goto f_err;
1770                                 }
1771 #ifdef SSL_DEBUG
1772 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1773 #endif
1774                         p += 2;
1775                         n -= 2;
1776                         }
1777                 else
1778                         md = EVP_sha1();
1779
1780                 n2s(p,i);
1781                 n-=2;
1782                 j=EVP_PKEY_size(pkey);
1783
1784                 if ((i != n) || (n > j) || (n <= 0))
1785                         {
1786                         /* wrong packet length */
1787                         al=SSL_AD_DECODE_ERROR;
1788                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1789                         goto f_err;
1790                         }
1791
1792 #ifndef OPENSSL_NO_RSA
1793                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1794                         {
1795                         int num;
1796
1797                         j=0;
1798                         q=md_buf;
1799                         for (num=2; num > 0; num--)
1800                                 {
1801                                 EVP_MD_CTX_set_flags(&md_ctx,
1802                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1803                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1804                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1805                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1806                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1807                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1808                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1809                                 q+=i;
1810                                 j+=i;
1811                                 }
1812                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1813                                                                 pkey->pkey.rsa);
1814                         if (i < 0)
1815                                 {
1816                                 al=SSL_AD_DECRYPT_ERROR;
1817                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1818                                 goto f_err;
1819                                 }
1820                         if (i == 0)
1821                                 {
1822                                 /* bad signature */
1823                                 al=SSL_AD_DECRYPT_ERROR;
1824                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1825                                 goto f_err;
1826                                 }
1827                         }
1828                 else
1829 #endif
1830                         {
1831                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1832                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1833                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1834                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1835                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1836                                 {
1837                                 /* bad signature */
1838                                 al=SSL_AD_DECRYPT_ERROR;
1839                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1840                                 goto f_err;
1841                                 }
1842                         }
1843                 }
1844         else
1845                 {
1846                 /* aNULL or kPSK do not need public keys */
1847                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1848                         {
1849                         /* Might be wrong key type, check it */
1850                         if (ssl3_check_cert_and_algorithm(s))
1851                                 /* Otherwise this shouldn't happen */
1852                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1853                         goto err;
1854                         }
1855                 /* still data left over */
1856                 if (n != 0)
1857                         {
1858                         al=SSL_AD_DECODE_ERROR;
1859                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1860                         goto f_err;
1861                         }
1862                 }
1863         EVP_PKEY_free(pkey);
1864         EVP_MD_CTX_cleanup(&md_ctx);
1865         return(1);
1866 f_err:
1867         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1868 err:
1869         EVP_PKEY_free(pkey);
1870 #ifndef OPENSSL_NO_RSA
1871         if (rsa != NULL)
1872                 RSA_free(rsa);
1873 #endif
1874 #ifndef OPENSSL_NO_DH
1875         if (dh != NULL)
1876                 DH_free(dh);
1877 #endif
1878 #ifndef OPENSSL_NO_ECDH
1879         BN_CTX_free(bn_ctx);
1880         EC_POINT_free(srvr_ecpoint);
1881         if (ecdh != NULL)
1882                 EC_KEY_free(ecdh);
1883 #endif
1884         EVP_MD_CTX_cleanup(&md_ctx);
1885         return(-1);
1886         }
1887
1888 int ssl3_get_certificate_request(SSL *s)
1889         {
1890         int ok,ret=0;
1891         unsigned long n,nc,l;
1892         unsigned int llen, ctype_num,i;
1893         X509_NAME *xn=NULL;
1894         const unsigned char *p,*q;
1895         unsigned char *d;
1896         STACK_OF(X509_NAME) *ca_sk=NULL;
1897
1898         n=s->method->ssl_get_message(s,
1899                 SSL3_ST_CR_CERT_REQ_A,
1900                 SSL3_ST_CR_CERT_REQ_B,
1901                 -1,
1902                 s->max_cert_list,
1903                 &ok);
1904
1905         if (!ok) return((int)n);
1906
1907         s->s3->tmp.cert_req=0;
1908
1909         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1910                 {
1911                 s->s3->tmp.reuse_message=1;
1912                 /* If we get here we don't need any cached handshake records
1913                  * as we wont be doing client auth.
1914                  */
1915                 if (s->s3->handshake_buffer)
1916                         {
1917                         if (!ssl3_digest_cached_records(s))
1918                                 goto err;
1919                         }
1920                 return(1);
1921                 }
1922
1923         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1924                 {
1925                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1926                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1927                 goto err;
1928                 }
1929
1930         /* TLS does not like anon-DH with client cert */
1931         if (s->version > SSL3_VERSION)
1932                 {
1933                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1934                         {
1935                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1936                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1937                         goto err;
1938                         }
1939                 }
1940
1941         p=d=(unsigned char *)s->init_msg;
1942
1943         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1944                 {
1945                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1946                 goto err;
1947                 }
1948
1949         /* get the certificate types */
1950         ctype_num= *(p++);
1951         if (s->cert->ctypes)
1952                 {
1953                 OPENSSL_free(s->cert->ctypes);
1954                 s->cert->ctypes = NULL;
1955                 }
1956         if (ctype_num > SSL3_CT_NUMBER)
1957                 {
1958                 /* If we exceed static buffer copy all to cert structure */
1959                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1960                 memcpy(s->cert->ctypes, p, ctype_num);
1961                 s->cert->ctype_num = (size_t)ctype_num;
1962                 ctype_num=SSL3_CT_NUMBER;
1963                 }
1964         for (i=0; i<ctype_num; i++)
1965                 s->s3->tmp.ctype[i]= p[i];
1966         p+=p[-1];
1967         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1968                 {
1969                 n2s(p, llen);
1970                 /* Check we have enough room for signature algorithms and
1971                  * following length value.
1972                  */
1973                 if ((unsigned long)(p - d + llen + 2) > n)
1974                         {
1975                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1976                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1977                         goto err;
1978                         }
1979                 /* Clear certificate digests and validity flags */
1980                 for (i = 0; i < SSL_PKEY_NUM; i++)
1981                         {
1982                         s->cert->pkeys[i].digest = NULL;
1983                         s->cert->pkeys[i].valid_flags = 0;
1984                         }
1985                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1986                         {
1987                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1988                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1989                         goto err;
1990                         }
1991                 p += llen;
1992                 }
1993
1994         /* get the CA RDNs */
1995         n2s(p,llen);
1996 #if 0
1997 {
1998 FILE *out;
1999 out=fopen("/tmp/vsign.der","w");
2000 fwrite(p,1,llen,out);
2001 fclose(out);
2002 }
2003 #endif
2004
2005         if ((unsigned long)(p - d + llen) != n)
2006                 {
2007                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2008                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2009                 goto err;
2010                 }
2011
2012         for (nc=0; nc<llen; )
2013                 {
2014                 n2s(p,l);
2015                 if ((l+nc+2) > llen)
2016                         {
2017                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2018                                 goto cont; /* netscape bugs */
2019                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2020                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2021                         goto err;
2022                         }
2023
2024                 q=p;
2025
2026                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2027                         {
2028                         /* If netscape tolerance is on, ignore errors */
2029                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2030                                 goto cont;
2031                         else
2032                                 {
2033                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2034                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2035                                 goto err;
2036                                 }
2037                         }
2038
2039                 if (q != (p+l))
2040                         {
2041                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2042                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2043                         goto err;
2044                         }
2045                 if (!sk_X509_NAME_push(ca_sk,xn))
2046                         {
2047                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2048                         goto err;
2049                         }
2050
2051                 p+=l;
2052                 nc+=l+2;
2053                 }
2054
2055         if (0)
2056                 {
2057 cont:
2058                 ERR_clear_error();
2059                 }
2060
2061         /* we should setup a certificate to return.... */
2062         s->s3->tmp.cert_req=1;
2063         s->s3->tmp.ctype_num=ctype_num;
2064         if (s->s3->tmp.ca_names != NULL)
2065                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2066         s->s3->tmp.ca_names=ca_sk;
2067         ca_sk=NULL;
2068
2069         ret=1;
2070 err:
2071         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2072         return(ret);
2073         }
2074
2075 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2076         {
2077         return(X509_NAME_cmp(*a,*b));
2078         }
2079 #ifndef OPENSSL_NO_TLSEXT
2080 int ssl3_get_new_session_ticket(SSL *s)
2081         {
2082         int ok,al,ret=0, ticklen;
2083         long n;
2084         const unsigned char *p;
2085         unsigned char *d;
2086
2087         n=s->method->ssl_get_message(s,
2088                 SSL3_ST_CR_SESSION_TICKET_A,
2089                 SSL3_ST_CR_SESSION_TICKET_B,
2090                 -1,
2091                 16384,
2092                 &ok);
2093
2094         if (!ok)
2095                 return((int)n);
2096
2097         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2098                 {
2099                 s->s3->tmp.reuse_message=1;
2100                 return(1);
2101                 }
2102         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2103                 {
2104                 al=SSL_AD_UNEXPECTED_MESSAGE;
2105                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2106                 goto f_err;
2107                 }
2108         if (n < 6)
2109                 {
2110                 /* need at least ticket_lifetime_hint + ticket length */
2111                 al = SSL_AD_DECODE_ERROR;
2112                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2113                 goto f_err;
2114                 }
2115
2116         p=d=(unsigned char *)s->init_msg;
2117         n2l(p, s->session->tlsext_tick_lifetime_hint);
2118         n2s(p, ticklen);
2119         /* ticket_lifetime_hint + ticket_length + ticket */
2120         if (ticklen + 6 != n)
2121                 {
2122                 al = SSL_AD_DECODE_ERROR;
2123                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2124                 goto f_err;
2125                 }
2126         if (s->session->tlsext_tick)
2127                 {
2128                 OPENSSL_free(s->session->tlsext_tick);
2129                 s->session->tlsext_ticklen = 0;
2130                 }
2131         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2132         if (!s->session->tlsext_tick)
2133                 {
2134                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2135                 goto err;
2136                 }
2137         memcpy(s->session->tlsext_tick, p, ticklen);
2138         s->session->tlsext_ticklen = ticklen;
2139         /* There are two ways to detect a resumed ticket sesion.
2140          * One is to set an appropriate session ID and then the server
2141          * must return a match in ServerHello. This allows the normal
2142          * client session ID matching to work and we know much
2143          * earlier that the ticket has been accepted.
2144          *
2145          * The other way is to set zero length session ID when the
2146          * ticket is presented and rely on the handshake to determine
2147          * session resumption.
2148          *
2149          * We choose the former approach because this fits in with
2150          * assumptions elsewhere in OpenSSL. The session ID is set
2151          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2152          * ticket.
2153          */
2154         EVP_Digest(p, ticklen,
2155                         s->session->session_id, &s->session->session_id_length,
2156 #ifndef OPENSSL_NO_SHA256
2157                                                         EVP_sha256(), NULL);
2158 #else
2159                                                         EVP_sha1(), NULL);
2160 #endif
2161         ret=1;
2162         return(ret);
2163 f_err:
2164         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2165 err:
2166         return(-1);
2167         }
2168
2169 int ssl3_get_cert_status(SSL *s)
2170         {
2171         int ok, al;
2172         unsigned long resplen,n;
2173         const unsigned char *p;
2174
2175         n=s->method->ssl_get_message(s,
2176                 SSL3_ST_CR_CERT_STATUS_A,
2177                 SSL3_ST_CR_CERT_STATUS_B,
2178                 SSL3_MT_CERTIFICATE_STATUS,
2179                 16384,
2180                 &ok);
2181
2182         if (!ok) return((int)n);
2183         if (n < 4)
2184                 {
2185                 /* need at least status type + length */
2186                 al = SSL_AD_DECODE_ERROR;
2187                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2188                 goto f_err;
2189                 }
2190         p = (unsigned char *)s->init_msg;
2191         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2192                 {
2193                 al = SSL_AD_DECODE_ERROR;
2194                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2195                 goto f_err;
2196                 }
2197         n2l3(p, resplen);
2198         if (resplen + 4 != n)
2199                 {
2200                 al = SSL_AD_DECODE_ERROR;
2201                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2202                 goto f_err;
2203                 }
2204         if (s->tlsext_ocsp_resp)
2205                 OPENSSL_free(s->tlsext_ocsp_resp);
2206         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2207         if (!s->tlsext_ocsp_resp)
2208                 {
2209                 al = SSL_AD_INTERNAL_ERROR;
2210                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2211                 goto f_err;
2212                 }
2213         s->tlsext_ocsp_resplen = resplen;
2214         if (s->ctx->tlsext_status_cb)
2215                 {
2216                 int ret;
2217                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2218                 if (ret == 0)
2219                         {
2220                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2221                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2222                         goto f_err;
2223                         }
2224                 if (ret < 0)
2225                         {
2226                         al = SSL_AD_INTERNAL_ERROR;
2227                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2228                         goto f_err;
2229                         }
2230                 }
2231         return 1;
2232 f_err:
2233         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2234         return(-1);
2235         }
2236 #endif
2237
2238 int ssl3_get_server_done(SSL *s)
2239         {
2240         int ok,ret=0;
2241         long n;
2242
2243         n=s->method->ssl_get_message(s,
2244                 SSL3_ST_CR_SRVR_DONE_A,
2245                 SSL3_ST_CR_SRVR_DONE_B,
2246                 SSL3_MT_SERVER_DONE,
2247                 30, /* should be very small, like 0 :-) */
2248                 &ok);
2249
2250         if (!ok) return((int)n);
2251         if (n > 0)
2252                 {
2253                 /* should contain no data */
2254                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2255                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2256                 return -1;
2257                 }
2258         ret=1;
2259         return(ret);
2260         }
2261
2262
2263 int ssl3_send_client_key_exchange(SSL *s)
2264         {
2265         unsigned char *p,*d;
2266         int n;
2267         unsigned long alg_k;
2268 #ifndef OPENSSL_NO_RSA
2269         unsigned char *q;
2270         EVP_PKEY *pkey=NULL;
2271 #endif
2272 #ifndef OPENSSL_NO_KRB5
2273         KSSL_ERR kssl_err;
2274 #endif /* OPENSSL_NO_KRB5 */
2275 #ifndef OPENSSL_NO_ECDH
2276         EC_KEY *clnt_ecdh = NULL;
2277         const EC_POINT *srvr_ecpoint = NULL;
2278         EVP_PKEY *srvr_pub_pkey = NULL;
2279         unsigned char *encodedPoint = NULL;
2280         int encoded_pt_len = 0;
2281         BN_CTX * bn_ctx = NULL;
2282 #endif
2283
2284         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2285                 {
2286                 d=(unsigned char *)s->init_buf->data;
2287                 p= &(d[4]);
2288
2289                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2290
2291                 /* Fool emacs indentation */
2292                 if (0) {}
2293 #ifndef OPENSSL_NO_RSA
2294                 else if (alg_k & SSL_kRSA)
2295                         {
2296                         RSA *rsa;
2297                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2298
2299                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2300                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2301                         else
2302                                 {
2303                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2304                                 if ((pkey == NULL) ||
2305                                         (pkey->type != EVP_PKEY_RSA) ||
2306                                         (pkey->pkey.rsa == NULL))
2307                                         {
2308                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2309                                         goto err;
2310                                         }
2311                                 rsa=pkey->pkey.rsa;
2312                                 EVP_PKEY_free(pkey);
2313                                 }
2314
2315                         tmp_buf[0]=s->client_version>>8;
2316                         tmp_buf[1]=s->client_version&0xff;
2317                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2318                                         goto err;
2319
2320                         s->session->master_key_length=sizeof tmp_buf;
2321
2322                         q=p;
2323                         /* Fix buf for TLS and beyond */
2324                         if (s->version > SSL3_VERSION)
2325                                 p+=2;
2326                         n=RSA_public_encrypt(sizeof tmp_buf,
2327                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2328 #ifdef PKCS1_CHECK
2329                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2330                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2331 #endif
2332                         if (n <= 0)
2333                                 {
2334                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2335                                 goto err;
2336                                 }
2337
2338                         /* Fix buf for TLS and beyond */
2339                         if (s->version > SSL3_VERSION)
2340                                 {
2341                                 s2n(n,q);
2342                                 n+=2;
2343                                 }
2344
2345                         s->session->master_key_length=
2346                                 s->method->ssl3_enc->generate_master_secret(s,
2347                                         s->session->master_key,
2348                                         tmp_buf,sizeof tmp_buf);
2349                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2350                         }
2351 #endif
2352 #ifndef OPENSSL_NO_KRB5
2353                 else if (alg_k & SSL_kKRB5)
2354                         {
2355                         krb5_error_code krb5rc;
2356                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2357                         /*  krb5_data   krb5_ap_req;  */
2358                         krb5_data       *enc_ticket;
2359                         krb5_data       authenticator, *authp = NULL;
2360                         EVP_CIPHER_CTX  ciph_ctx;
2361                         const EVP_CIPHER *enc = NULL;
2362                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2363                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2364                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2365                                                 + EVP_MAX_IV_LENGTH];
2366                         int             padl, outl = sizeof(epms);
2367
2368                         EVP_CIPHER_CTX_init(&ciph_ctx);
2369
2370 #ifdef KSSL_DEBUG
2371                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2372                                 alg_k, SSL_kKRB5);
2373 #endif  /* KSSL_DEBUG */
2374
2375                         authp = NULL;
2376 #ifdef KRB5SENDAUTH
2377                         if (KRB5SENDAUTH)  authp = &authenticator;
2378 #endif  /* KRB5SENDAUTH */
2379
2380                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2381                                 &kssl_err);
2382                         enc = kssl_map_enc(kssl_ctx->enctype);
2383                         if (enc == NULL)
2384                             goto err;
2385 #ifdef KSSL_DEBUG
2386                         {
2387                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2388                         if (krb5rc && kssl_err.text)
2389                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2390                         }
2391 #endif  /* KSSL_DEBUG */
2392
2393                         if (krb5rc)
2394                                 {
2395                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2396                                                 SSL_AD_HANDSHAKE_FAILURE);
2397                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2398                                                 kssl_err.reason);
2399                                 goto err;
2400                                 }
2401
2402                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2403                         **  in place of RFC 2712 KerberosWrapper, as in:
2404                         **
2405                         **  Send ticket (copy to *p, set n = length)
2406                         **  n = krb5_ap_req.length;
2407                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2408                         **  if (krb5_ap_req.data)
2409                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2410                         **
2411                         **  Now using real RFC 2712 KerberosWrapper
2412                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2413                         **  Note: 2712 "opaque" types are here replaced
2414                         **  with a 2-byte length followed by the value.
2415                         **  Example:
2416                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2417                         **  Where "xx xx" = length bytes.  Shown here with
2418                         **  optional authenticator omitted.
2419                         */
2420
2421                         /*  KerberosWrapper.Ticket              */
2422                         s2n(enc_ticket->length,p);
2423                         memcpy(p, enc_ticket->data, enc_ticket->length);
2424                         p+= enc_ticket->length;
2425                         n = enc_ticket->length + 2;
2426
2427                         /*  KerberosWrapper.Authenticator       */
2428                         if (authp  &&  authp->length)
2429                                 {
2430                                 s2n(authp->length,p);
2431                                 memcpy(p, authp->data, authp->length);
2432                                 p+= authp->length;
2433                                 n+= authp->length + 2;
2434
2435                                 free(authp->data);
2436                                 authp->data = NULL;
2437                                 authp->length = 0;
2438                                 }
2439                         else
2440                                 {
2441                                 s2n(0,p);/*  null authenticator length  */
2442                                 n+=2;
2443                                 }
2444
2445                             tmp_buf[0]=s->client_version>>8;
2446                             tmp_buf[1]=s->client_version&0xff;
2447                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2448                                 goto err;
2449
2450                         /*  20010420 VRS.  Tried it this way; failed.
2451                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2452                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2453                         **                              kssl_ctx->length);
2454                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2455                         */
2456
2457                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2458                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2459                                 kssl_ctx->key,iv);
2460                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2461                                 sizeof tmp_buf);
2462                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2463                         outl += padl;
2464                         if (outl > (int)sizeof epms)
2465                                 {
2466                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2467                                 goto err;
2468                                 }
2469                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2470
2471                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2472                         s2n(outl,p);
2473                         memcpy(p, epms, outl);
2474                         p+=outl;
2475                         n+=outl + 2;
2476
2477                         s->session->master_key_length=
2478                                 s->method->ssl3_enc->generate_master_secret(s,
2479                                         s->session->master_key,
2480                                         tmp_buf, sizeof tmp_buf);
2481
2482                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2483                         OPENSSL_cleanse(epms, outl);
2484                         }
2485 #endif
2486 #ifndef OPENSSL_NO_DH
2487                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2488                         {
2489                         DH *dh_srvr,*dh_clnt;
2490                         SESS_CERT *scert = s->session->sess_cert;
2491
2492                         if (scert == NULL)
2493                                 {
2494                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2495                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2496                                 goto err;
2497                                 }
2498
2499                         if (scert->peer_dh_tmp != NULL)
2500                                 dh_srvr=scert->peer_dh_tmp;
2501                         else
2502                                 {
2503                                 /* we get them from the cert */
2504                                 int idx = scert->peer_cert_type;
2505                                 EVP_PKEY *spkey = NULL;
2506                                 dh_srvr = NULL;
2507                                 if (idx >= 0)
2508                                         spkey = X509_get_pubkey(
2509                                                 scert->peer_pkeys[idx].x509);
2510                                 if (spkey)
2511                                         {
2512                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2513                                         EVP_PKEY_free(spkey);
2514                                         }
2515                                 if (dh_srvr == NULL)
2516                                         {
2517                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2518                                             ERR_R_INTERNAL_ERROR);
2519                                         goto err;
2520                                         }
2521                                 }
2522                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2523                                 {
2524                                 /* Use client certificate key */
2525                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2526                                 dh_clnt = NULL;
2527                                 if (clkey)
2528                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2529                                 if (dh_clnt == NULL)
2530                                         {
2531                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2532                                             ERR_R_INTERNAL_ERROR);
2533                                         goto err;
2534                                         }
2535                                 }
2536                         else
2537                                 {
2538                                 /* generate a new random key */
2539                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2540                                         {
2541                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2542                                         goto err;
2543                                         }
2544                                 if (!DH_generate_key(dh_clnt))
2545                                         {
2546                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2547                                         DH_free(dh_clnt);
2548                                         goto err;
2549                                         }
2550                                 }
2551
2552                         /* use the 'p' output buffer for the DH key, but
2553                          * make sure to clear it out afterwards */
2554
2555                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2556                         if (scert->peer_dh_tmp == NULL)
2557                                 DH_free(dh_srvr);
2558
2559                         if (n <= 0)
2560                                 {
2561                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2562                                 DH_free(dh_clnt);
2563                                 goto err;
2564                                 }
2565
2566                         /* generate master key from the result */
2567                         s->session->master_key_length=
2568                                 s->method->ssl3_enc->generate_master_secret(s,
2569                                         s->session->master_key,p,n);
2570                         /* clean up */
2571                         memset(p,0,n);
2572
2573                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2574                                 n = 0;
2575                         else
2576                                 {
2577                                 /* send off the data */
2578                                 n=BN_num_bytes(dh_clnt->pub_key);
2579                                 s2n(n,p);
2580                                 BN_bn2bin(dh_clnt->pub_key,p);
2581                                 n+=2;
2582                                 }
2583
2584                         DH_free(dh_clnt);
2585
2586                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2587                         }
2588 #endif
2589
2590 #ifndef OPENSSL_NO_ECDH
2591                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2592                         {
2593                         const EC_GROUP *srvr_group = NULL;
2594                         EC_KEY *tkey;
2595                         int ecdh_clnt_cert = 0;
2596                         int field_size = 0;
2597
2598                         /* Did we send out the client's
2599                          * ECDH share for use in premaster
2600                          * computation as part of client certificate?
2601                          * If so, set ecdh_clnt_cert to 1.
2602                          */
2603                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2604                                 {
2605                                 /* XXX: For now, we do not support client
2606                                  * authentication using ECDH certificates.
2607                                  * To add such support, one needs to add
2608                                  * code that checks for appropriate
2609                                  * conditions and sets ecdh_clnt_cert to 1.
2610                                  * For example, the cert have an ECC
2611                                  * key on the same curve as the server's
2612                                  * and the key should be authorized for
2613                                  * key agreement.
2614                                  *
2615                                  * One also needs to add code in ssl3_connect
2616                                  * to skip sending the certificate verify
2617                                  * message.
2618                                  *
2619                                  * if ((s->cert->key->privatekey != NULL) &&
2620                                  *     (s->cert->key->privatekey->type ==
2621                                  *      EVP_PKEY_EC) && ...)
2622                                  * ecdh_clnt_cert = 1;
2623                                  */
2624                                 }
2625
2626                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2627                                 {
2628                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2629                                 }
2630                         else
2631                                 {
2632                                 /* Get the Server Public Key from Cert */
2633                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2634                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2635                                 if ((srvr_pub_pkey == NULL) ||
2636                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2637                                     (srvr_pub_pkey->pkey.ec == NULL))
2638                                         {
2639                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2640                                             ERR_R_INTERNAL_ERROR);
2641                                         goto err;
2642                                         }
2643
2644                                 tkey = srvr_pub_pkey->pkey.ec;
2645                                 }
2646
2647                         srvr_group   = EC_KEY_get0_group(tkey);
2648                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2649
2650                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2651                                 {
2652                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2653                                     ERR_R_INTERNAL_ERROR);
2654                                 goto err;
2655                                 }
2656
2657                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2658                                 {
2659                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2660                                 goto err;
2661                                 }
2662
2663                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2664                                 {
2665                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2666                                 goto err;
2667                                 }
2668                         if (ecdh_clnt_cert)
2669                                 {
2670                                 /* Reuse key info from our certificate
2671                                  * We only need our private key to perform
2672                                  * the ECDH computation.
2673                                  */
2674                                 const BIGNUM *priv_key;
2675                                 tkey = s->cert->key->privatekey->pkey.ec;
2676                                 priv_key = EC_KEY_get0_private_key(tkey);
2677                                 if (priv_key == NULL)
2678                                         {
2679                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2680                                         goto err;
2681                                         }
2682                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2683                                         {
2684                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2685                                         goto err;
2686                                         }
2687                                 }
2688                         else
2689                                 {
2690                                 /* Generate a new ECDH key pair */
2691                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2692                                         {
2693                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2694                                         goto err;
2695                                         }
2696                                 }
2697
2698                         /* use the 'p' output buffer for the ECDH key, but
2699                          * make sure to clear it out afterwards
2700                          */
2701
2702                         field_size = EC_GROUP_get_degree(srvr_group);
2703                         if (field_size <= 0)
2704                                 {
2705                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2706                                        ERR_R_ECDH_LIB);
2707                                 goto err;
2708                                 }
2709                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2710                         if (n <= 0)
2711                                 {
2712                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2713                                        ERR_R_ECDH_LIB);
2714                                 goto err;
2715                                 }
2716
2717                         /* generate master key from the result */
2718                         s->session->master_key_length = s->method->ssl3_enc \
2719                             -> generate_master_secret(s,
2720                                 s->session->master_key,
2721                                 p, n);
2722
2723                         memset(p, 0, n); /* clean up */
2724
2725                         if (ecdh_clnt_cert)
2726                                 {
2727                                 /* Send empty client key exch message */
2728                                 n = 0;
2729                                 }
2730                         else
2731                                 {
2732                                 /* First check the size of encoding and
2733                                  * allocate memory accordingly.
2734                                  */
2735                                 encoded_pt_len =
2736                                     EC_POINT_point2oct(srvr_group,
2737                                         EC_KEY_get0_public_key(clnt_ecdh),
2738                                         POINT_CONVERSION_UNCOMPRESSED,
2739                                         NULL, 0, NULL);
2740
2741                                 encodedPoint = (unsigned char *)
2742                                     OPENSSL_malloc(encoded_pt_len *
2743                                         sizeof(unsigned char));
2744                                 bn_ctx = BN_CTX_new();
2745                                 if ((encodedPoint == NULL) ||
2746                                     (bn_ctx == NULL))
2747                                         {
2748                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2749                                         goto err;
2750                                         }
2751
2752                                 /* Encode the public key */
2753                                 n = EC_POINT_point2oct(srvr_group,
2754                                     EC_KEY_get0_public_key(clnt_ecdh),
2755                                     POINT_CONVERSION_UNCOMPRESSED,
2756                                     encodedPoint, encoded_pt_len, bn_ctx);
2757
2758                                 *p = n; /* length of encoded point */
2759                                 /* Encoded point will be copied here */
2760                                 p += 1;
2761                                 /* copy the point */
2762                                 memcpy((unsigned char *)p, encodedPoint, n);
2763                                 /* increment n to account for length field */
2764                                 n += 1;
2765                                 }
2766
2767                         /* Free allocated memory */
2768                         BN_CTX_free(bn_ctx);
2769                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2770                         if (clnt_ecdh != NULL)
2771                                  EC_KEY_free(clnt_ecdh);
2772                         EVP_PKEY_free(srvr_pub_pkey);
2773                         }
2774 #endif /* !OPENSSL_NO_ECDH */
2775                 else if (alg_k & SSL_kGOST)
2776                         {
2777                         /* GOST key exchange message creation */
2778                         EVP_PKEY_CTX *pkey_ctx;
2779                         X509 *peer_cert;
2780                         size_t msglen;
2781                         unsigned int md_len;
2782                         int keytype;
2783                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2784                         EVP_MD_CTX *ukm_hash;
2785                         EVP_PKEY *pub_key;
2786
2787                         /* Get server sertificate PKEY and create ctx from it */
2788                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2789                         if (!peer_cert)
2790                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2791                         if (!peer_cert)         {
2792                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2793                                         goto err;
2794                                 }
2795
2796                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2797                         /* If we have send a certificate, and certificate key
2798
2799                          * parameters match those of server certificate, use
2800                          * certificate key for key exchange
2801                          */
2802
2803                          /* Otherwise, generate ephemeral key pair */
2804
2805                         EVP_PKEY_encrypt_init(pkey_ctx);
2806                           /* Generate session key */
2807                     RAND_bytes(premaster_secret,32);
2808                         /* If we have client certificate, use its secret as peer key */
2809                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2810                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2811                                         /* If there was an error - just ignore it. Ephemeral key
2812                                         * would be used
2813                                         */
2814                                         ERR_clear_error();
2815                                 }
2816                         }
2817                         /* Compute shared IV and store it in algorithm-specific
2818                          * context data */
2819                         ukm_hash = EVP_MD_CTX_create();
2820                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2821                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2822                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2823                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2824                         EVP_MD_CTX_destroy(ukm_hash);
2825                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2826                                 8,shared_ukm)<0) {
2827                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2828                                                 SSL_R_LIBRARY_BUG);
2829                                         goto err;
2830                                 }
2831                         /* Make GOST keytransport blob message */
2832                         /*Encapsulate it into sequence */
2833                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2834                         msglen=255;
2835                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2836                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2837                                         SSL_R_LIBRARY_BUG);
2838                                 goto err;
2839                         }
2840                         if (msglen >= 0x80)
2841                                 {
2842                                 *(p++)=0x81;
2843                                 *(p++)= msglen & 0xff;
2844                                 n=msglen+3;
2845                                 }
2846                         else
2847                                 {
2848                                 *(p++)= msglen & 0xff;
2849                                 n=msglen+2;
2850                                 }
2851                         memcpy(p, tmp, msglen);
2852                         /* Check if pubkey from client certificate was used */
2853                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2854                                 {
2855                                 /* Set flag "skip certificate verify" */
2856                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2857                                 }
2858                         EVP_PKEY_CTX_free(pkey_ctx);
2859                         s->session->master_key_length=
2860                                 s->method->ssl3_enc->generate_master_secret(s,
2861                                         s->session->master_key,premaster_secret,32);
2862                         EVP_PKEY_free(pub_key);
2863
2864                         }
2865 #ifndef OPENSSL_NO_SRP
2866                 else if (alg_k & SSL_kSRP)
2867                         {
2868                         if (s->srp_ctx.A != NULL)
2869                                 {
2870                                 /* send off the data */
2871                                 n=BN_num_bytes(s->srp_ctx.A);
2872                                 s2n(n,p);
2873                                 BN_bn2bin(s->srp_ctx.A,p);
2874                                 n+=2;
2875                                 }
2876                         else
2877                                 {
2878                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2879                                 goto err;
2880                                 }
2881                         if (s->session->srp_username != NULL)
2882                                 OPENSSL_free(s->session->srp_username);
2883                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2884                         if (s->session->srp_username == NULL)
2885                                 {
2886                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2887                                         ERR_R_MALLOC_FAILURE);
2888                                 goto err;
2889                                 }
2890
2891                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2892                                 {
2893                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2894                                 goto err;
2895                                 }
2896                         }
2897 #endif
2898 #ifndef OPENSSL_NO_PSK
2899                 else if (alg_k & SSL_kPSK)
2900                         {
2901                         char identity[PSK_MAX_IDENTITY_LEN];
2902                         unsigned char *t = NULL;
2903                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2904                         unsigned int pre_ms_len = 0, psk_len = 0;
2905                         int psk_err = 1;
2906
2907                         n = 0;
2908                         if (s->psk_client_callback == NULL)
2909                                 {
2910                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2911                                         SSL_R_PSK_NO_CLIENT_CB);
2912                                 goto err;
2913                                 }
2914
2915                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2916                                 identity, PSK_MAX_IDENTITY_LEN,
2917                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2918                         if (psk_len > PSK_MAX_PSK_LEN)
2919                                 {
2920                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2921                                         ERR_R_INTERNAL_ERROR);
2922                                 goto psk_err;
2923                                 }
2924                         else if (psk_len == 0)
2925                                 {
2926                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2927                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2928                                 goto psk_err;
2929                                 }
2930
2931                         /* create PSK pre_master_secret */
2932                         pre_ms_len = 2+psk_len+2+psk_len;
2933                         t = psk_or_pre_ms;
2934                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2935                         s2n(psk_len, t);
2936                         memset(t, 0, psk_len);
2937                         t+=psk_len;
2938                         s2n(psk_len, t);
2939
2940                         if (s->session->psk_identity_hint != NULL)
2941                                 OPENSSL_free(s->session->psk_identity_hint);
2942                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2943                         if (s->ctx->psk_identity_hint != NULL &&
2944                                 s->session->psk_identity_hint == NULL)
2945                                 {
2946                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2947                                         ERR_R_MALLOC_FAILURE);
2948                                 goto psk_err;
2949                                 }
2950
2951                         if (s->session->psk_identity != NULL)
2952                                 OPENSSL_free(s->session->psk_identity);
2953                         s->session->psk_identity = BUF_strdup(identity);
2954                         if (s->session->psk_identity == NULL)
2955                                 {
2956                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2957                                         ERR_R_MALLOC_FAILURE);
2958                                 goto psk_err;
2959                                 }
2960
2961                         s->session->master_key_length =
2962                                 s->method->ssl3_enc->generate_master_secret(s,
2963                                         s->session->master_key,
2964                                         psk_or_pre_ms, pre_ms_len);
2965                         n = strlen(identity);
2966                         s2n(n, p);
2967                         memcpy(p, identity, n);
2968                         n+=2;
2969                         psk_err = 0;
2970                 psk_err:
2971                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2972                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2973                         if (psk_err != 0)
2974                                 {
2975                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2976                                 goto err;
2977                                 }
2978                         }
2979 #endif
2980                 else
2981                         {
2982                         ssl3_send_alert(s, SSL3_AL_FATAL,
2983                             SSL_AD_HANDSHAKE_FAILURE);
2984                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2985                             ERR_R_INTERNAL_ERROR);
2986                         goto err;
2987                         }
2988
2989                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2990                 l2n3(n,d);
2991
2992                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2993                 /* number of bytes to write */
2994                 s->init_num=n+4;
2995                 s->init_off=0;
2996                 }
2997
2998         /* SSL3_ST_CW_KEY_EXCH_B */
2999         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3000 err:
3001 #ifndef OPENSSL_NO_ECDH
3002         BN_CTX_free(bn_ctx);
3003         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3004         if (clnt_ecdh != NULL)
3005                 EC_KEY_free(clnt_ecdh);
3006         EVP_PKEY_free(srvr_pub_pkey);
3007 #endif
3008         return(-1);
3009         }
3010
3011 int ssl3_send_client_verify(SSL *s)
3012         {
3013         unsigned char *p,*d;
3014         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3015         EVP_PKEY *pkey;
3016         EVP_PKEY_CTX *pctx=NULL;
3017         EVP_MD_CTX mctx;
3018         unsigned u=0;
3019         unsigned long n;
3020         int j;
3021
3022         EVP_MD_CTX_init(&mctx);
3023
3024         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3025                 {
3026                 d=(unsigned char *)s->init_buf->data;
3027                 p= &(d[4]);
3028                 pkey=s->cert->key->privatekey;
3029 /* Create context from key and test if sha1 is allowed as digest */
3030                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3031                 EVP_PKEY_sign_init(pctx);
3032                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3033                         {
3034                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3035                                 s->method->ssl3_enc->cert_verify_mac(s,
3036                                                 NID_sha1,
3037                                                 &(data[MD5_DIGEST_LENGTH]));
3038                         }
3039                 else
3040                         {
3041                         ERR_clear_error();
3042                         }
3043                 /* For TLS v1.2 send signature algorithm and signature
3044                  * using agreed digest and cached handshake records.
3045                  */
3046                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3047                         {
3048                         long hdatalen = 0;
3049                         void *hdata;
3050                         const EVP_MD *md = s->cert->key->digest;
3051                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3052                                                                 &hdata);
3053                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3054                                 {
3055                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3056                                                 ERR_R_INTERNAL_ERROR);
3057                                 goto err;
3058                                 }
3059                         p += 2;
3060 #ifdef SSL_DEBUG
3061                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3062                                                         EVP_MD_name(md));
3063 #endif
3064                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3065                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3066                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3067                                 {
3068                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3069                                                 ERR_R_EVP_LIB);
3070                                 goto err;
3071                                 }
3072                         s2n(u,p);
3073                         n = u + 4;
3074                         if (!ssl3_digest_cached_records(s))
3075                                 goto err;
3076                         }
3077                 else
3078 #ifndef OPENSSL_NO_RSA
3079                 if (pkey->type == EVP_PKEY_RSA)
3080                         {
3081                         s->method->ssl3_enc->cert_verify_mac(s,
3082                                 NID_md5,
3083                                 &(data[0]));
3084                         if (RSA_sign(NID_md5_sha1, data,
3085                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3086                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3087                                 {
3088                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3089                                 goto err;
3090                                 }
3091                         s2n(u,p);
3092                         n=u+2;
3093                         }
3094                 else
3095 #endif
3096 #ifndef OPENSSL_NO_DSA
3097                         if (pkey->type == EVP_PKEY_DSA)
3098                         {
3099                         if (!DSA_sign(pkey->save_type,
3100                                 &(data[MD5_DIGEST_LENGTH]),
3101                                 SHA_DIGEST_LENGTH,&(p[2]),
3102                                 (unsigned int *)&j,pkey->pkey.dsa))
3103                                 {
3104                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3105                                 goto err;
3106                                 }
3107                         s2n(j,p);
3108                         n=j+2;
3109                         }
3110                 else
3111 #endif
3112 #ifndef OPENSSL_NO_ECDSA
3113                         if (pkey->type == EVP_PKEY_EC)
3114                         {
3115                         if (!ECDSA_sign(pkey->save_type,
3116                                 &(data[MD5_DIGEST_LENGTH]),
3117                                 SHA_DIGEST_LENGTH,&(p[2]),
3118                                 (unsigned int *)&j,pkey->pkey.ec))
3119                                 {
3120                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3121                                     ERR_R_ECDSA_LIB);
3122                                 goto err;
3123                                 }
3124                         s2n(j,p);
3125                         n=j+2;
3126                         }
3127                 else
3128 #endif
3129                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3130                 {
3131                 unsigned char signbuf[64];
3132                 int i;
3133                 size_t sigsize=64;
3134                 s->method->ssl3_enc->cert_verify_mac(s,
3135                         NID_id_GostR3411_94,
3136                         data);
3137                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3138                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3139                         ERR_R_INTERNAL_ERROR);
3140                         goto err;
3141                 }
3142                 for (i=63,j=0; i>=0; j++, i--) {
3143                         p[2+j]=signbuf[i];
3144                 }
3145                 s2n(j,p);
3146                 n=j+2;
3147                 }
3148                 else
3149                 {
3150                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3151                         goto err;
3152                 }
3153                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3154                 l2n3(n,d);
3155
3156                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3157                 s->init_num=(int)n+4;
3158                 s->init_off=0;
3159                 }
3160         EVP_MD_CTX_cleanup(&mctx);
3161         EVP_PKEY_CTX_free(pctx);
3162         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3163 err:
3164         EVP_MD_CTX_cleanup(&mctx);
3165         EVP_PKEY_CTX_free(pctx);
3166         return(-1);
3167         }
3168
3169 /* Check a certificate can be used for client authentication. Currently
3170  * check cert exists, if we have a suitable digest for TLS 1.2 if
3171  * static DH client certificates can be used and optionally checks
3172  * suitability for Suite B.
3173  */
3174 static int ssl3_check_client_certificate(SSL *s)
3175         {
3176         unsigned long alg_k;
3177         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3178                 return 0;
3179         /* If no suitable signature algorithm can't use certificate */
3180         if (TLS1_get_version(s) >= TLS1_2_VERSION && !s->cert->key->digest)
3181                 return 0;
3182         /* If strict mode check suitability of chain before using it.
3183          * This also adjusts suite B digest if necessary.
3184          */
3185         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3186                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3187                 return 0;
3188         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3189         /* See if we can use client certificate for fixed DH */
3190         if (alg_k & (SSL_kDHr|SSL_kDHd))
3191                 {
3192                 SESS_CERT *scert = s->session->sess_cert;
3193                 int i = scert->peer_cert_type;
3194                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3195                 clkey = s->cert->key->privatekey;
3196                 /* If client key not DH assume it can be used */
3197                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3198                         return 1;
3199                 if (i >= 0)
3200                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3201                 if (spkey)
3202                         {
3203                         /* Compare server and client parameters */
3204                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3205                         EVP_PKEY_free(spkey);
3206                         if (i != 1)
3207                                 return 0;
3208                         }
3209                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3210                 }
3211         return 1;
3212         }
3213
3214 int ssl3_send_client_certificate(SSL *s)
3215         {
3216         X509 *x509=NULL;
3217         EVP_PKEY *pkey=NULL;
3218         int i;
3219         unsigned long l;
3220
3221         if (s->state == SSL3_ST_CW_CERT_A)
3222                 {
3223                 /* Let cert callback update client certificates if required */
3224                 if (s->cert->cert_cb
3225                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3226                         {
3227                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3228                         return 0;
3229                         }
3230                 if (ssl3_check_client_certificate(s))
3231                         s->state=SSL3_ST_CW_CERT_C;
3232                 else
3233                         s->state=SSL3_ST_CW_CERT_B;
3234                 }
3235
3236         /* We need to get a client cert */
3237         if (s->state == SSL3_ST_CW_CERT_B)
3238                 {
3239                 /* If we get an error, we need to
3240                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3241                  * We then get retied later */
3242                 i=0;
3243                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3244                 if (i < 0)
3245                         {
3246                         s->rwstate=SSL_X509_LOOKUP;
3247                         return(-1);
3248                         }
3249                 s->rwstate=SSL_NOTHING;
3250                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3251                         {
3252                         s->state=SSL3_ST_CW_CERT_B;
3253                         if (    !SSL_use_certificate(s,x509) ||
3254                                 !SSL_use_PrivateKey(s,pkey))
3255                                 i=0;
3256                         }
3257                 else if (i == 1)
3258                         {
3259                         i=0;
3260                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3261                         }
3262
3263                 if (x509 != NULL) X509_free(x509);
3264                 if (pkey != NULL) EVP_PKEY_free(pkey);
3265                 if (i && !ssl3_check_client_certificate(s))
3266                         i = 0;
3267                 if (i == 0)
3268                         {
3269                         if (s->version == SSL3_VERSION)
3270                                 {
3271                                 s->s3->tmp.cert_req=0;
3272                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3273                                 return(1);
3274                                 }
3275                         else
3276                                 {
3277                                 s->s3->tmp.cert_req=2;
3278                                 }
3279                         }
3280
3281                 /* Ok, we have a cert */
3282                 s->state=SSL3_ST_CW_CERT_C;
3283                 }
3284
3285         if (s->state == SSL3_ST_CW_CERT_C)
3286                 {
3287                 s->state=SSL3_ST_CW_CERT_D;
3288                 l=ssl3_output_cert_chain(s,
3289                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3290                 s->init_num=(int)l;
3291                 s->init_off=0;
3292                 }
3293         /* SSL3_ST_CW_CERT_D */
3294         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3295         }
3296
3297 #define has_bits(i,m)   (((i)&(m)) == (m))
3298
3299 int ssl3_check_cert_and_algorithm(SSL *s)
3300         {
3301         int i,idx;
3302         long alg_k,alg_a;
3303         EVP_PKEY *pkey=NULL;
3304         SESS_CERT *sc;
3305 #ifndef OPENSSL_NO_RSA
3306         RSA *rsa;
3307 #endif
3308 #ifndef OPENSSL_NO_DH
3309         DH *dh;
3310 #endif
3311
3312         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3313         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3314
3315         /* we don't have a certificate */
3316         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3317                 return(1);
3318
3319         sc=s->session->sess_cert;
3320         if (sc == NULL)
3321                 {
3322                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3323                 goto err;
3324                 }
3325
3326 #ifndef OPENSSL_NO_RSA
3327         rsa=s->session->sess_cert->peer_rsa_tmp;
3328 #endif
3329 #ifndef OPENSSL_NO_DH
3330         dh=s->session->sess_cert->peer_dh_tmp;
3331 #endif
3332
3333         /* This is the passed certificate */
3334
3335         idx=sc->peer_cert_type;
3336 #ifndef OPENSSL_NO_ECDH
3337         if (idx == SSL_PKEY_ECC)
3338                 {
3339                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3340                                                                 s) == 0)
3341                         { /* check failed */
3342                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3343                         goto f_err;
3344                         }
3345                 else
3346                         {
3347                         return 1;
3348                         }
3349                 }
3350         else if (alg_a & SSL_aECDSA)
3351                 {
3352                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3353                 goto f_err;
3354                 }
3355         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3356                 {
3357                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3358                 goto f_err;
3359                 }
3360 #endif
3361         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3362         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3363         EVP_PKEY_free(pkey);
3364
3365
3366         /* Check that we have a certificate if we require one */
3367         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3368                 {
3369                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3370                 goto f_err;
3371                 }
3372 #ifndef OPENSSL_NO_DSA
3373         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3374                 {
3375                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3376                 goto f_err;
3377                 }
3378 #endif
3379 #ifndef OPENSSL_NO_RSA
3380         if ((alg_k & SSL_kRSA) &&
3381                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3382                 {
3383                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3384                 goto f_err;
3385                 }
3386 #endif
3387 #ifndef OPENSSL_NO_DH
3388         if ((alg_k & SSL_kEDH) &&
3389                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3390                 {
3391                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3392                 goto f_err;
3393                 }
3394         else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3395                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3396                 {
3397                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3398                 goto f_err;
3399                 }
3400 #ifndef OPENSSL_NO_DSA
3401         else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3402                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3403                 {
3404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3405                 goto f_err;
3406                 }
3407 #endif
3408 #endif
3409
3410         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3411                 {
3412 #ifndef OPENSSL_NO_RSA
3413                 if (alg_k & SSL_kRSA)
3414                         {
3415                         if (rsa == NULL
3416                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3417                                 {
3418                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3419                                 goto f_err;
3420                                 }
3421                         }
3422                 else
3423 #endif
3424 #ifndef OPENSSL_NO_DH
3425                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3426                             {
3427                             if (dh == NULL
3428                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3429                                 {
3430                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3431                                 goto f_err;
3432                                 }
3433                         }
3434                 else
3435 #endif
3436                         {
3437                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3438                         goto f_err;
3439                         }
3440                 }
3441         return(1);
3442 f_err:
3443         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3444 err:
3445         return(0);
3446         }
3447
3448 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3449 int ssl3_send_next_proto(SSL *s)
3450         {
3451         unsigned int len, padding_len;
3452         unsigned char *d;
3453
3454         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3455                 {
3456                 len = s->next_proto_negotiated_len;
3457                 padding_len = 32 - ((len + 2) % 32);
3458                 d = (unsigned char *)s->init_buf->data;
3459                 d[4] = len;
3460                 memcpy(d + 5, s->next_proto_negotiated, len);
3461                 d[5 + len] = padding_len;
3462                 memset(d + 6 + len, 0, padding_len);
3463                 *(d++)=SSL3_MT_NEXT_PROTO;
3464                 l2n3(2 + len + padding_len, d);
3465                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3466                 s->init_num = 4 + 2 + len + padding_len;
3467                 s->init_off = 0;
3468                 }
3469
3470         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3471 }
3472 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3473
3474 /* Check to see if handshake is full or resumed. Usually this is just a
3475  * case of checking to see if a cache hit has occurred. In the case of
3476  * session tickets we have to check the next message to be sure.
3477  */
3478
3479 #ifndef OPENSSL_NO_TLSEXT
3480 int ssl3_check_finished(SSL *s)
3481         {
3482         int ok;
3483         long n;
3484         /* If we have no ticket it cannot be a resumed session. */
3485         if (!s->session->tlsext_tick)
3486                 return 1;
3487         /* this function is called when we really expect a Certificate
3488          * message, so permit appropriate message length */
3489         n=s->method->ssl_get_message(s,
3490                 SSL3_ST_CR_CERT_A,
3491                 SSL3_ST_CR_CERT_B,
3492                 -1,
3493                 s->max_cert_list,
3494                 &ok);
3495         if (!ok) return((int)n);
3496         s->s3->tmp.reuse_message = 1;
3497         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3498                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3499                 return 2;
3500
3501         return 1;
3502         }
3503 #endif
3504
3505 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3506         {
3507         int i = 0;
3508 #ifndef OPENSSL_NO_ENGINE
3509         if (s->ctx->client_cert_engine)
3510                 {
3511                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3512                                                 SSL_get_client_CA_list(s),
3513                                                 px509, ppkey, NULL, NULL, NULL);
3514                 if (i != 0)
3515                         return i;
3516                 }
3517 #endif
3518         if (s->ctx->client_cert_cb)
3519                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3520         return i;
3521         }
3522
3523 #ifndef OPENSSL_NO_TLSEXT
3524 int tls1_get_server_supplemental_data(SSL *s)
3525         {
3526         int al;
3527         int ok;
3528         unsigned long supp_data_len, authz_data_len;
3529         long n;
3530         unsigned short supp_data_type, authz_data_type, proof_len;
3531         const unsigned char *p;
3532         unsigned char *new_proof;
3533
3534         n=s->method->ssl_get_message(s,
3535                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3536                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3537                 SSL3_MT_SUPPLEMENTAL_DATA,
3538                 /* use default limit */
3539                 TLSEXT_MAXLEN_supplemental_data,
3540                 &ok);
3541
3542         if (!ok) return((int)n);
3543
3544         p = (unsigned char *)s->init_msg;
3545
3546         /* The message cannot be empty */
3547         if (n < 3)
3548                 {
3549                 al = SSL_AD_DECODE_ERROR;
3550                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3551                 goto f_err;
3552                 }
3553         /* Length of supplemental data */
3554         n2l3(p,supp_data_len);
3555         n -= 3;
3556         /* We must have at least one supplemental data entry
3557          * with type (1 byte) and length (2 bytes). */
3558         if (supp_data_len != (unsigned long) n || n < 4)
3559                 {
3560                 al = SSL_AD_DECODE_ERROR;
3561                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3562                 goto f_err;
3563                 }
3564         /* Supplemental data type: must be authz_data */
3565         n2s(p,supp_data_type);
3566         n -= 2;
3567         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3568                 {
3569                 al = SSL_AD_UNEXPECTED_MESSAGE;
3570                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3571                 goto f_err;
3572                 }
3573         /* Authz data length */
3574         n2s(p, authz_data_len);
3575         n -= 2;
3576         if (authz_data_len != (unsigned long) n || n < 1)
3577                 {
3578                 al = SSL_AD_DECODE_ERROR;
3579                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3580                 goto f_err;
3581                 }
3582         /* Authz data type: must be audit_proof */
3583         authz_data_type = *(p++);
3584         n -= 1;
3585         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3586                 {
3587                 al=SSL_AD_UNEXPECTED_MESSAGE;
3588                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3589                 goto f_err;
3590                 }
3591         /* We have a proof: read its length */
3592         if (n < 2)
3593                 {
3594                 al = SSL_AD_DECODE_ERROR;
3595                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3596                 goto f_err;
3597                 }
3598         n2s(p, proof_len);
3599         n -= 2;
3600         if (proof_len != (unsigned long) n)
3601                 {
3602                 al = SSL_AD_DECODE_ERROR;
3603                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3604                 goto f_err;
3605                 }
3606         /* Store the proof */
3607         new_proof = OPENSSL_realloc(s->session->audit_proof,
3608                                     proof_len);
3609         if (new_proof == NULL)
3610                 {
3611                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3612                 return 0;
3613                 }
3614         s->session->audit_proof_length = proof_len;
3615         s->session->audit_proof = new_proof;
3616         memcpy(s->session->audit_proof, p, proof_len);
3617
3618         /* Got the proof, but can't verify it yet. */
3619         return 1;
3620 f_err:
3621         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3622         return -1;
3623         }
3624 #endif