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                 sc->peer_cert_type=i;
1229                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1230                 /* Why would the following ever happen?
1231                  * We just created sc a couple of lines ago. */
1232                 if (sc->peer_pkeys[i].x509 != NULL)
1233                         X509_free(sc->peer_pkeys[i].x509);
1234                 sc->peer_pkeys[i].x509=x;
1235                 sc->peer_key= &(sc->peer_pkeys[i]);
1236
1237                 if (s->session->peer != NULL)
1238                         X509_free(s->session->peer);
1239                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1240                 s->session->peer=x;
1241                 }
1242         else
1243                 {
1244                 sc->peer_cert_type=i;
1245                 sc->peer_key= NULL;
1246
1247                 if (s->session->peer != NULL)
1248                         X509_free(s->session->peer);
1249                 s->session->peer=NULL;
1250                 }
1251         s->session->verify_result = s->verify_result;
1252
1253         x=NULL;
1254 #ifndef OPENSSL_NO_TLSEXT
1255         /* Check the audit proof. */
1256         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1257                 {
1258                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1259                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1260                 if (ret <= 0)
1261                         {
1262                         al = SSL_AD_BAD_CERTIFICATE;
1263                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1264                         goto f_err;
1265                         }
1266                 }
1267
1268 #endif
1269         ret=1;
1270
1271         if (0)
1272                 {
1273 f_err:
1274                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1275                 }
1276 err:
1277         EVP_PKEY_free(pkey);
1278         X509_free(x);
1279         sk_X509_pop_free(sk,X509_free);
1280         return(ret);
1281         }
1282
1283 int ssl3_get_key_exchange(SSL *s)
1284         {
1285 #ifndef OPENSSL_NO_RSA
1286         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1287 #endif
1288         EVP_MD_CTX md_ctx;
1289         unsigned char *param,*p;
1290         int al,i,j,param_len,ok;
1291         long n,alg_k,alg_a;
1292         EVP_PKEY *pkey=NULL;
1293         const EVP_MD *md = NULL;
1294 #ifndef OPENSSL_NO_RSA
1295         RSA *rsa=NULL;
1296 #endif
1297 #ifndef OPENSSL_NO_DH
1298         DH *dh=NULL;
1299 #endif
1300 #ifndef OPENSSL_NO_ECDH
1301         EC_KEY *ecdh = NULL;
1302         BN_CTX *bn_ctx = NULL;
1303         EC_POINT *srvr_ecpoint = NULL;
1304         int curve_nid = 0;
1305         int encoded_pt_len = 0;
1306 #endif
1307
1308         /* use same message size as in ssl3_get_certificate_request()
1309          * as ServerKeyExchange message may be skipped */
1310         n=s->method->ssl_get_message(s,
1311                 SSL3_ST_CR_KEY_EXCH_A,
1312                 SSL3_ST_CR_KEY_EXCH_B,
1313                 -1,
1314                 s->max_cert_list,
1315                 &ok);
1316         if (!ok) return((int)n);
1317
1318         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1319                 {
1320 #ifndef OPENSSL_NO_PSK
1321                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1322                    omitted if no identity hint is sent. Set
1323                    session->sess_cert anyway to avoid problems
1324                    later.*/
1325                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1326                         {
1327                         s->session->sess_cert=ssl_sess_cert_new();
1328                         if (s->ctx->psk_identity_hint)
1329                                 OPENSSL_free(s->ctx->psk_identity_hint);
1330                         s->ctx->psk_identity_hint = NULL;
1331                         }
1332 #endif
1333                 s->s3->tmp.reuse_message=1;
1334                 return(1);
1335                 }
1336
1337         param=p=(unsigned char *)s->init_msg;
1338         if (s->session->sess_cert != NULL)
1339                 {
1340 #ifndef OPENSSL_NO_RSA
1341                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1342                         {
1343                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1344                         s->session->sess_cert->peer_rsa_tmp=NULL;
1345                         }
1346 #endif
1347 #ifndef OPENSSL_NO_DH
1348                 if (s->session->sess_cert->peer_dh_tmp)
1349                         {
1350                         DH_free(s->session->sess_cert->peer_dh_tmp);
1351                         s->session->sess_cert->peer_dh_tmp=NULL;
1352                         }
1353 #endif
1354 #ifndef OPENSSL_NO_ECDH
1355                 if (s->session->sess_cert->peer_ecdh_tmp)
1356                         {
1357                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1358                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1359                         }
1360 #endif
1361                 }
1362         else
1363                 {
1364                 s->session->sess_cert=ssl_sess_cert_new();
1365                 }
1366
1367         param_len=0;
1368         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1369         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1370         EVP_MD_CTX_init(&md_ctx);
1371
1372 #ifndef OPENSSL_NO_PSK
1373         if (alg_k & SSL_kPSK)
1374                 {
1375                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1376
1377                 al=SSL_AD_HANDSHAKE_FAILURE;
1378                 n2s(p,i);
1379                 param_len=i+2;
1380                 /* Store PSK identity hint for later use, hint is used
1381                  * in ssl3_send_client_key_exchange.  Assume that the
1382                  * maximum length of a PSK identity hint can be as
1383                  * long as the maximum length of a PSK identity. */
1384                 if (i > PSK_MAX_IDENTITY_LEN)
1385                         {
1386                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1387                                 SSL_R_DATA_LENGTH_TOO_LONG);
1388                         goto f_err;
1389                         }
1390                 if (param_len > n)
1391                         {
1392                         al=SSL_AD_DECODE_ERROR;
1393                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1394                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1395                         goto f_err;
1396                         }
1397                 /* If received PSK identity hint contains NULL
1398                  * characters, the hint is truncated from the first
1399                  * NULL. p may not be ending with NULL, so create a
1400                  * NULL-terminated string. */
1401                 memcpy(tmp_id_hint, p, i);
1402                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1403                 if (s->ctx->psk_identity_hint != NULL)
1404                         OPENSSL_free(s->ctx->psk_identity_hint);
1405                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1406                 if (s->ctx->psk_identity_hint == NULL)
1407                         {
1408                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1409                         goto f_err;
1410                         }
1411
1412                 p+=i;
1413                 n-=param_len;
1414                 }
1415         else
1416 #endif /* !OPENSSL_NO_PSK */
1417 #ifndef OPENSSL_NO_SRP
1418         if (alg_k & SSL_kSRP)
1419                 {
1420                 n2s(p,i);
1421                 param_len=i+2;
1422                 if (param_len > n)
1423                         {
1424                         al=SSL_AD_DECODE_ERROR;
1425                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1426                         goto f_err;
1427                         }
1428                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1429                         {
1430                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1431                         goto err;
1432                         }
1433                 p+=i;
1434
1435                 n2s(p,i);
1436                 param_len+=i+2;
1437                 if (param_len > n)
1438                         {
1439                         al=SSL_AD_DECODE_ERROR;
1440                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1441                         goto f_err;
1442                         }
1443                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1444                         {
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1446                         goto err;
1447                         }
1448                 p+=i;
1449
1450                 i = (unsigned int)(p[0]);
1451                 p++;
1452                 param_len+=i+1;
1453                 if (param_len > n)
1454                         {
1455                         al=SSL_AD_DECODE_ERROR;
1456                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1457                         goto f_err;
1458                         }
1459                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1460                         {
1461                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1462                         goto err;
1463                         }
1464                 p+=i;
1465
1466                 n2s(p,i);
1467                 param_len+=i+2;
1468                 if (param_len > n)
1469                         {
1470                         al=SSL_AD_DECODE_ERROR;
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1472                         goto f_err;
1473                         }
1474                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1475                         {
1476                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1477                         goto err;
1478                         }
1479                 p+=i;
1480                 n-=param_len;
1481
1482 /* We must check if there is a certificate */
1483 #ifndef OPENSSL_NO_RSA
1484                 if (alg_a & SSL_aRSA)
1485                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1486 #else
1487                 if (0)
1488                         ;
1489 #endif
1490 #ifndef OPENSSL_NO_DSA
1491                 else if (alg_a & SSL_aDSS)
1492                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1493 #endif
1494                 }
1495         else
1496 #endif /* !OPENSSL_NO_SRP */
1497 #ifndef OPENSSL_NO_RSA
1498         if (alg_k & SSL_kRSA)
1499                 {
1500                 if ((rsa=RSA_new()) == NULL)
1501                         {
1502                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1503                         goto err;
1504                         }
1505                 n2s(p,i);
1506                 param_len=i+2;
1507                 if (param_len > n)
1508                         {
1509                         al=SSL_AD_DECODE_ERROR;
1510                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1511                         goto f_err;
1512                         }
1513                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1514                         {
1515                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1516                         goto err;
1517                         }
1518                 p+=i;
1519
1520                 n2s(p,i);
1521                 param_len+=i+2;
1522                 if (param_len > n)
1523                         {
1524                         al=SSL_AD_DECODE_ERROR;
1525                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1526                         goto f_err;
1527                         }
1528                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1529                         {
1530                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1531                         goto err;
1532                         }
1533                 p+=i;
1534                 n-=param_len;
1535
1536                 /* this should be because we are using an export cipher */
1537                 if (alg_a & SSL_aRSA)
1538                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1539                 else
1540                         {
1541                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1542                         goto err;
1543                         }
1544                 s->session->sess_cert->peer_rsa_tmp=rsa;
1545                 rsa=NULL;
1546                 }
1547 #else /* OPENSSL_NO_RSA */
1548         if (0)
1549                 ;
1550 #endif
1551 #ifndef OPENSSL_NO_DH
1552         else if (alg_k & SSL_kEDH)
1553                 {
1554                 if ((dh=DH_new()) == NULL)
1555                         {
1556                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1557                         goto err;
1558                         }
1559                 n2s(p,i);
1560                 param_len=i+2;
1561                 if (param_len > n)
1562                         {
1563                         al=SSL_AD_DECODE_ERROR;
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1565                         goto f_err;
1566                         }
1567                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1568                         {
1569                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1570                         goto err;
1571                         }
1572                 p+=i;
1573
1574                 n2s(p,i);
1575                 param_len+=i+2;
1576                 if (param_len > n)
1577                         {
1578                         al=SSL_AD_DECODE_ERROR;
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1580                         goto f_err;
1581                         }
1582                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1583                         {
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1585                         goto err;
1586                         }
1587                 p+=i;
1588
1589                 n2s(p,i);
1590                 param_len+=i+2;
1591                 if (param_len > n)
1592                         {
1593                         al=SSL_AD_DECODE_ERROR;
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1595                         goto f_err;
1596                         }
1597                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1600                         goto err;
1601                         }
1602                 p+=i;
1603                 n-=param_len;
1604
1605 #ifndef OPENSSL_NO_RSA
1606                 if (alg_a & SSL_aRSA)
1607                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1608 #else
1609                 if (0)
1610                         ;
1611 #endif
1612 #ifndef OPENSSL_NO_DSA
1613                 else if (alg_a & SSL_aDSS)
1614                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1615 #endif
1616                 /* else anonymous DH, so no certificate or pkey. */
1617
1618                 s->session->sess_cert->peer_dh_tmp=dh;
1619                 dh=NULL;
1620                 }
1621         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1622                 {
1623                 al=SSL_AD_ILLEGAL_PARAMETER;
1624                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1625                 goto f_err;
1626                 }
1627 #endif /* !OPENSSL_NO_DH */
1628
1629 #ifndef OPENSSL_NO_ECDH
1630         else if (alg_k & SSL_kEECDH)
1631                 {
1632                 EC_GROUP *ngroup;
1633                 const EC_GROUP *group;
1634
1635                 if ((ecdh=EC_KEY_new()) == NULL)
1636                         {
1637                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1638                         goto err;
1639                         }
1640
1641                 /* Extract elliptic curve parameters and the
1642                  * server's ephemeral ECDH public key.
1643                  * Keep accumulating lengths of various components in
1644                  * param_len and make sure it never exceeds n.
1645                  */
1646
1647                 /* XXX: For now we only support named (not generic) curves
1648                  * and the ECParameters in this case is just three bytes.
1649                  */
1650                 param_len=3;
1651                 /* Check curve is one of our prefrences, if not server has
1652                  * sent an invalid curve.
1653                  */
1654                 if (!tls1_check_curve(s, p, param_len))
1655                         {
1656                         al=SSL_AD_DECODE_ERROR;
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1658                         goto f_err;
1659                         }
1660
1661                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1662                         {
1663                         al=SSL_AD_INTERNAL_ERROR;
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1665                         goto f_err;
1666                         }
1667
1668                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1669                 if (ngroup == NULL)
1670                         {
1671                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1672                         goto err;
1673                         }
1674                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1675                         {
1676                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1677                         goto err;
1678                         }
1679                 EC_GROUP_free(ngroup);
1680
1681                 group = EC_KEY_get0_group(ecdh);
1682
1683                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1684                     (EC_GROUP_get_degree(group) > 163))
1685                         {
1686                         al=SSL_AD_EXPORT_RESTRICTION;
1687                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1688                         goto f_err;
1689                         }
1690
1691                 p+=3;
1692
1693                 /* Next, get the encoded ECPoint */
1694                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1695                     ((bn_ctx = BN_CTX_new()) == NULL))
1696                         {
1697                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1698                         goto err;
1699                         }
1700
1701                 encoded_pt_len = *p;  /* length of encoded point */
1702                 p+=1;
1703                 param_len += (1 + encoded_pt_len);
1704                 if ((param_len > n) ||
1705                     (EC_POINT_oct2point(group, srvr_ecpoint,
1706                         p, encoded_pt_len, bn_ctx) == 0))
1707                         {
1708                         al=SSL_AD_DECODE_ERROR;
1709                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1710                         goto f_err;
1711                         }
1712
1713                 n-=param_len;
1714                 p+=encoded_pt_len;
1715
1716                 /* The ECC/TLS specification does not mention
1717                  * the use of DSA to sign ECParameters in the server
1718                  * key exchange message. We do support RSA and ECDSA.
1719                  */
1720                 if (0) ;
1721 #ifndef OPENSSL_NO_RSA
1722                 else if (alg_a & SSL_aRSA)
1723                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1724 #endif
1725 #ifndef OPENSSL_NO_ECDSA
1726                 else if (alg_a & SSL_aECDSA)
1727                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1728 #endif
1729                 /* else anonymous ECDH, so no certificate or pkey. */
1730                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1731                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1732                 ecdh=NULL;
1733                 BN_CTX_free(bn_ctx);
1734                 bn_ctx = NULL;
1735                 EC_POINT_free(srvr_ecpoint);
1736                 srvr_ecpoint = NULL;
1737                 }
1738         else if (alg_k)
1739                 {
1740                 al=SSL_AD_UNEXPECTED_MESSAGE;
1741                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1742                 goto f_err;
1743                 }
1744 #endif /* !OPENSSL_NO_ECDH */
1745
1746
1747         /* p points to the next byte, there are 'n' bytes left */
1748
1749         /* if it was signed, check the signature */
1750         if (pkey != NULL)
1751                 {
1752                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1753                         {
1754                         int sigalg = tls12_get_sigid(pkey);
1755                         /* Should never happen */
1756                         if (sigalg == -1)
1757                                 {
1758                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1759                                 goto err;
1760                                 }
1761                         /* Check key type is consistent with signature */
1762                         if (sigalg != (int)p[1])
1763                                 {
1764                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1765                                 al=SSL_AD_DECODE_ERROR;
1766                                 goto f_err;
1767                                 }
1768                         md = tls12_get_hash(p[0]);
1769                         if (md == NULL)
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1772                                 al=SSL_AD_DECODE_ERROR;
1773                                 goto f_err;
1774                                 }
1775 #ifdef SSL_DEBUG
1776 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1777 #endif
1778                         p += 2;
1779                         n -= 2;
1780                         }
1781                 else
1782                         md = EVP_sha1();
1783
1784                 n2s(p,i);
1785                 n-=2;
1786                 j=EVP_PKEY_size(pkey);
1787
1788                 if ((i != n) || (n > j) || (n <= 0))
1789                         {
1790                         /* wrong packet length */
1791                         al=SSL_AD_DECODE_ERROR;
1792                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1793                         goto f_err;
1794                         }
1795
1796 #ifndef OPENSSL_NO_RSA
1797                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1798                         {
1799                         int num;
1800
1801                         j=0;
1802                         q=md_buf;
1803                         for (num=2; num > 0; num--)
1804                                 {
1805                                 EVP_MD_CTX_set_flags(&md_ctx,
1806                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1807                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1808                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1809                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1810                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1811                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1812                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1813                                 q+=i;
1814                                 j+=i;
1815                                 }
1816                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1817                                                                 pkey->pkey.rsa);
1818                         if (i < 0)
1819                                 {
1820                                 al=SSL_AD_DECRYPT_ERROR;
1821                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1822                                 goto f_err;
1823                                 }
1824                         if (i == 0)
1825                                 {
1826                                 /* bad signature */
1827                                 al=SSL_AD_DECRYPT_ERROR;
1828                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1829                                 goto f_err;
1830                                 }
1831                         }
1832                 else
1833 #endif
1834                         {
1835                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1836                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1837                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1838                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1839                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1840                                 {
1841                                 /* bad signature */
1842                                 al=SSL_AD_DECRYPT_ERROR;
1843                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1844                                 goto f_err;
1845                                 }
1846                         }
1847                 }
1848         else
1849                 {
1850                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1851                         /* aNULL or kPSK do not need public keys */
1852                         {
1853                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1854                         goto err;
1855                         }
1856                 /* still data left over */
1857                 if (n != 0)
1858                         {
1859                         al=SSL_AD_DECODE_ERROR;
1860                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1861                         goto f_err;
1862                         }
1863                 }
1864         EVP_PKEY_free(pkey);
1865         EVP_MD_CTX_cleanup(&md_ctx);
1866         return(1);
1867 f_err:
1868         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1869 err:
1870         EVP_PKEY_free(pkey);
1871 #ifndef OPENSSL_NO_RSA
1872         if (rsa != NULL)
1873                 RSA_free(rsa);
1874 #endif
1875 #ifndef OPENSSL_NO_DH
1876         if (dh != NULL)
1877                 DH_free(dh);
1878 #endif
1879 #ifndef OPENSSL_NO_ECDH
1880         BN_CTX_free(bn_ctx);
1881         EC_POINT_free(srvr_ecpoint);
1882         if (ecdh != NULL)
1883                 EC_KEY_free(ecdh);
1884 #endif
1885         EVP_MD_CTX_cleanup(&md_ctx);
1886         return(-1);
1887         }
1888
1889 int ssl3_get_certificate_request(SSL *s)
1890         {
1891         int ok,ret=0;
1892         unsigned long n,nc,l;
1893         unsigned int llen, ctype_num,i;
1894         X509_NAME *xn=NULL;
1895         const unsigned char *p,*q;
1896         unsigned char *d;
1897         STACK_OF(X509_NAME) *ca_sk=NULL;
1898
1899         n=s->method->ssl_get_message(s,
1900                 SSL3_ST_CR_CERT_REQ_A,
1901                 SSL3_ST_CR_CERT_REQ_B,
1902                 -1,
1903                 s->max_cert_list,
1904                 &ok);
1905
1906         if (!ok) return((int)n);
1907
1908         s->s3->tmp.cert_req=0;
1909
1910         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1911                 {
1912                 s->s3->tmp.reuse_message=1;
1913                 /* If we get here we don't need any cached handshake records
1914                  * as we wont be doing client auth.
1915                  */
1916                 if (s->s3->handshake_buffer)
1917                         {
1918                         if (!ssl3_digest_cached_records(s))
1919                                 goto err;
1920                         }
1921                 return(1);
1922                 }
1923
1924         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1925                 {
1926                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1927                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1928                 goto err;
1929                 }
1930
1931         /* TLS does not like anon-DH with client cert */
1932         if (s->version > SSL3_VERSION)
1933                 {
1934                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1935                         {
1936                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1937                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1938                         goto err;
1939                         }
1940                 }
1941
1942         p=d=(unsigned char *)s->init_msg;
1943
1944         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1945                 {
1946                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1947                 goto err;
1948                 }
1949
1950         /* get the certificate types */
1951         ctype_num= *(p++);
1952         if (s->cert->ctypes)
1953                 {
1954                 OPENSSL_free(s->cert->ctypes);
1955                 s->cert->ctypes = NULL;
1956                 }
1957         if (ctype_num > SSL3_CT_NUMBER)
1958                 {
1959                 /* If we exceed static buffer copy all to cert structure */
1960                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1961                 memcpy(s->cert->ctypes, p, ctype_num);
1962                 s->cert->ctype_num = (size_t)ctype_num;
1963                 ctype_num=SSL3_CT_NUMBER;
1964                 }
1965         for (i=0; i<ctype_num; i++)
1966                 s->s3->tmp.ctype[i]= p[i];
1967         p+=p[-1];
1968         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1969                 {
1970                 n2s(p, llen);
1971                 /* Check we have enough room for signature algorithms and
1972                  * following length value.
1973                  */
1974                 if ((unsigned long)(p - d + llen + 2) > n)
1975                         {
1976                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1977                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1978                         goto err;
1979                         }
1980                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1981                         {
1982                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1983                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1984                         goto err;
1985                         }
1986                 p += llen;
1987                 }
1988
1989         /* get the CA RDNs */
1990         n2s(p,llen);
1991 #if 0
1992 {
1993 FILE *out;
1994 out=fopen("/tmp/vsign.der","w");
1995 fwrite(p,1,llen,out);
1996 fclose(out);
1997 }
1998 #endif
1999
2000         if ((unsigned long)(p - d + llen) != n)
2001                 {
2002                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2003                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2004                 goto err;
2005                 }
2006
2007         for (nc=0; nc<llen; )
2008                 {
2009                 n2s(p,l);
2010                 if ((l+nc+2) > llen)
2011                         {
2012                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2013                                 goto cont; /* netscape bugs */
2014                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2015                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2016                         goto err;
2017                         }
2018
2019                 q=p;
2020
2021                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2022                         {
2023                         /* If netscape tolerance is on, ignore errors */
2024                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2025                                 goto cont;
2026                         else
2027                                 {
2028                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2029                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2030                                 goto err;
2031                                 }
2032                         }
2033
2034                 if (q != (p+l))
2035                         {
2036                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2037                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2038                         goto err;
2039                         }
2040                 if (!sk_X509_NAME_push(ca_sk,xn))
2041                         {
2042                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2043                         goto err;
2044                         }
2045
2046                 p+=l;
2047                 nc+=l+2;
2048                 }
2049
2050         if (0)
2051                 {
2052 cont:
2053                 ERR_clear_error();
2054                 }
2055
2056         /* we should setup a certificate to return.... */
2057         s->s3->tmp.cert_req=1;
2058         s->s3->tmp.ctype_num=ctype_num;
2059         if (s->s3->tmp.ca_names != NULL)
2060                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2061         s->s3->tmp.ca_names=ca_sk;
2062         ca_sk=NULL;
2063
2064         ret=1;
2065 err:
2066         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2067         return(ret);
2068         }
2069
2070 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2071         {
2072         return(X509_NAME_cmp(*a,*b));
2073         }
2074 #ifndef OPENSSL_NO_TLSEXT
2075 int ssl3_get_new_session_ticket(SSL *s)
2076         {
2077         int ok,al,ret=0, ticklen;
2078         long n;
2079         const unsigned char *p;
2080         unsigned char *d;
2081
2082         n=s->method->ssl_get_message(s,
2083                 SSL3_ST_CR_SESSION_TICKET_A,
2084                 SSL3_ST_CR_SESSION_TICKET_B,
2085                 -1,
2086                 16384,
2087                 &ok);
2088
2089         if (!ok)
2090                 return((int)n);
2091
2092         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2093                 {
2094                 s->s3->tmp.reuse_message=1;
2095                 return(1);
2096                 }
2097         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2098                 {
2099                 al=SSL_AD_UNEXPECTED_MESSAGE;
2100                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2101                 goto f_err;
2102                 }
2103         if (n < 6)
2104                 {
2105                 /* need at least ticket_lifetime_hint + ticket length */
2106                 al = SSL_AD_DECODE_ERROR;
2107                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2108                 goto f_err;
2109                 }
2110
2111         p=d=(unsigned char *)s->init_msg;
2112         n2l(p, s->session->tlsext_tick_lifetime_hint);
2113         n2s(p, ticklen);
2114         /* ticket_lifetime_hint + ticket_length + ticket */
2115         if (ticklen + 6 != n)
2116                 {
2117                 al = SSL_AD_DECODE_ERROR;
2118                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2119                 goto f_err;
2120                 }
2121         if (s->session->tlsext_tick)
2122                 {
2123                 OPENSSL_free(s->session->tlsext_tick);
2124                 s->session->tlsext_ticklen = 0;
2125                 }
2126         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2127         if (!s->session->tlsext_tick)
2128                 {
2129                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2130                 goto err;
2131                 }
2132         memcpy(s->session->tlsext_tick, p, ticklen);
2133         s->session->tlsext_ticklen = ticklen;
2134         /* There are two ways to detect a resumed ticket sesion.
2135          * One is to set an appropriate session ID and then the server
2136          * must return a match in ServerHello. This allows the normal
2137          * client session ID matching to work and we know much
2138          * earlier that the ticket has been accepted.
2139          *
2140          * The other way is to set zero length session ID when the
2141          * ticket is presented and rely on the handshake to determine
2142          * session resumption.
2143          *
2144          * We choose the former approach because this fits in with
2145          * assumptions elsewhere in OpenSSL. The session ID is set
2146          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2147          * ticket.
2148          */
2149         EVP_Digest(p, ticklen,
2150                         s->session->session_id, &s->session->session_id_length,
2151 #ifndef OPENSSL_NO_SHA256
2152                                                         EVP_sha256(), NULL);
2153 #else
2154                                                         EVP_sha1(), NULL);
2155 #endif
2156         ret=1;
2157         return(ret);
2158 f_err:
2159         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2160 err:
2161         return(-1);
2162         }
2163
2164 int ssl3_get_cert_status(SSL *s)
2165         {
2166         int ok, al;
2167         unsigned long resplen,n;
2168         const unsigned char *p;
2169
2170         n=s->method->ssl_get_message(s,
2171                 SSL3_ST_CR_CERT_STATUS_A,
2172                 SSL3_ST_CR_CERT_STATUS_B,
2173                 SSL3_MT_CERTIFICATE_STATUS,
2174                 16384,
2175                 &ok);
2176
2177         if (!ok) return((int)n);
2178         if (n < 4)
2179                 {
2180                 /* need at least status type + length */
2181                 al = SSL_AD_DECODE_ERROR;
2182                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2183                 goto f_err;
2184                 }
2185         p = (unsigned char *)s->init_msg;
2186         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2187                 {
2188                 al = SSL_AD_DECODE_ERROR;
2189                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2190                 goto f_err;
2191                 }
2192         n2l3(p, resplen);
2193         if (resplen + 4 != n)
2194                 {
2195                 al = SSL_AD_DECODE_ERROR;
2196                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2197                 goto f_err;
2198                 }
2199         if (s->tlsext_ocsp_resp)
2200                 OPENSSL_free(s->tlsext_ocsp_resp);
2201         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2202         if (!s->tlsext_ocsp_resp)
2203                 {
2204                 al = SSL_AD_INTERNAL_ERROR;
2205                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2206                 goto f_err;
2207                 }
2208         s->tlsext_ocsp_resplen = resplen;
2209         if (s->ctx->tlsext_status_cb)
2210                 {
2211                 int ret;
2212                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2213                 if (ret == 0)
2214                         {
2215                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2216                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2217                         goto f_err;
2218                         }
2219                 if (ret < 0)
2220                         {
2221                         al = SSL_AD_INTERNAL_ERROR;
2222                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2223                         goto f_err;
2224                         }
2225                 }
2226         return 1;
2227 f_err:
2228         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2229         return(-1);
2230         }
2231 #endif
2232
2233 int ssl3_get_server_done(SSL *s)
2234         {
2235         int ok,ret=0;
2236         long n;
2237
2238         n=s->method->ssl_get_message(s,
2239                 SSL3_ST_CR_SRVR_DONE_A,
2240                 SSL3_ST_CR_SRVR_DONE_B,
2241                 SSL3_MT_SERVER_DONE,
2242                 30, /* should be very small, like 0 :-) */
2243                 &ok);
2244
2245         if (!ok) return((int)n);
2246         if (n > 0)
2247                 {
2248                 /* should contain no data */
2249                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2250                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2251                 return -1;
2252                 }
2253         ret=1;
2254         return(ret);
2255         }
2256
2257
2258 int ssl3_send_client_key_exchange(SSL *s)
2259         {
2260         unsigned char *p,*d;
2261         int n;
2262         unsigned long alg_k;
2263 #ifndef OPENSSL_NO_RSA
2264         unsigned char *q;
2265         EVP_PKEY *pkey=NULL;
2266 #endif
2267 #ifndef OPENSSL_NO_KRB5
2268         KSSL_ERR kssl_err;
2269 #endif /* OPENSSL_NO_KRB5 */
2270 #ifndef OPENSSL_NO_ECDH
2271         EC_KEY *clnt_ecdh = NULL;
2272         const EC_POINT *srvr_ecpoint = NULL;
2273         EVP_PKEY *srvr_pub_pkey = NULL;
2274         unsigned char *encodedPoint = NULL;
2275         int encoded_pt_len = 0;
2276         BN_CTX * bn_ctx = NULL;
2277 #endif
2278
2279         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2280                 {
2281                 d=(unsigned char *)s->init_buf->data;
2282                 p= &(d[4]);
2283
2284                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2285
2286                 /* Fool emacs indentation */
2287                 if (0) {}
2288 #ifndef OPENSSL_NO_RSA
2289                 else if (alg_k & SSL_kRSA)
2290                         {
2291                         RSA *rsa;
2292                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2293
2294                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2295                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2296                         else
2297                                 {
2298                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2299                                 if ((pkey == NULL) ||
2300                                         (pkey->type != EVP_PKEY_RSA) ||
2301                                         (pkey->pkey.rsa == NULL))
2302                                         {
2303                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2304                                         goto err;
2305                                         }
2306                                 rsa=pkey->pkey.rsa;
2307                                 EVP_PKEY_free(pkey);
2308                                 }
2309
2310                         tmp_buf[0]=s->client_version>>8;
2311                         tmp_buf[1]=s->client_version&0xff;
2312                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2313                                         goto err;
2314
2315                         s->session->master_key_length=sizeof tmp_buf;
2316
2317                         q=p;
2318                         /* Fix buf for TLS and beyond */
2319                         if (s->version > SSL3_VERSION)
2320                                 p+=2;
2321                         n=RSA_public_encrypt(sizeof tmp_buf,
2322                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2323 #ifdef PKCS1_CHECK
2324                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2325                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2326 #endif
2327                         if (n <= 0)
2328                                 {
2329                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2330                                 goto err;
2331                                 }
2332
2333                         /* Fix buf for TLS and beyond */
2334                         if (s->version > SSL3_VERSION)
2335                                 {
2336                                 s2n(n,q);
2337                                 n+=2;
2338                                 }
2339
2340                         s->session->master_key_length=
2341                                 s->method->ssl3_enc->generate_master_secret(s,
2342                                         s->session->master_key,
2343                                         tmp_buf,sizeof tmp_buf);
2344                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2345                         }
2346 #endif
2347 #ifndef OPENSSL_NO_KRB5
2348                 else if (alg_k & SSL_kKRB5)
2349                         {
2350                         krb5_error_code krb5rc;
2351                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2352                         /*  krb5_data   krb5_ap_req;  */
2353                         krb5_data       *enc_ticket;
2354                         krb5_data       authenticator, *authp = NULL;
2355                         EVP_CIPHER_CTX  ciph_ctx;
2356                         const EVP_CIPHER *enc = NULL;
2357                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2358                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2359                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2360                                                 + EVP_MAX_IV_LENGTH];
2361                         int             padl, outl = sizeof(epms);
2362
2363                         EVP_CIPHER_CTX_init(&ciph_ctx);
2364
2365 #ifdef KSSL_DEBUG
2366                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2367                                 alg_k, SSL_kKRB5);
2368 #endif  /* KSSL_DEBUG */
2369
2370                         authp = NULL;
2371 #ifdef KRB5SENDAUTH
2372                         if (KRB5SENDAUTH)  authp = &authenticator;
2373 #endif  /* KRB5SENDAUTH */
2374
2375                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2376                                 &kssl_err);
2377                         enc = kssl_map_enc(kssl_ctx->enctype);
2378                         if (enc == NULL)
2379                             goto err;
2380 #ifdef KSSL_DEBUG
2381                         {
2382                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2383                         if (krb5rc && kssl_err.text)
2384                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2385                         }
2386 #endif  /* KSSL_DEBUG */
2387
2388                         if (krb5rc)
2389                                 {
2390                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2391                                                 SSL_AD_HANDSHAKE_FAILURE);
2392                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2393                                                 kssl_err.reason);
2394                                 goto err;
2395                                 }
2396
2397                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2398                         **  in place of RFC 2712 KerberosWrapper, as in:
2399                         **
2400                         **  Send ticket (copy to *p, set n = length)
2401                         **  n = krb5_ap_req.length;
2402                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2403                         **  if (krb5_ap_req.data)
2404                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2405                         **
2406                         **  Now using real RFC 2712 KerberosWrapper
2407                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2408                         **  Note: 2712 "opaque" types are here replaced
2409                         **  with a 2-byte length followed by the value.
2410                         **  Example:
2411                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2412                         **  Where "xx xx" = length bytes.  Shown here with
2413                         **  optional authenticator omitted.
2414                         */
2415
2416                         /*  KerberosWrapper.Ticket              */
2417                         s2n(enc_ticket->length,p);
2418                         memcpy(p, enc_ticket->data, enc_ticket->length);
2419                         p+= enc_ticket->length;
2420                         n = enc_ticket->length + 2;
2421
2422                         /*  KerberosWrapper.Authenticator       */
2423                         if (authp  &&  authp->length)
2424                                 {
2425                                 s2n(authp->length,p);
2426                                 memcpy(p, authp->data, authp->length);
2427                                 p+= authp->length;
2428                                 n+= authp->length + 2;
2429
2430                                 free(authp->data);
2431                                 authp->data = NULL;
2432                                 authp->length = 0;
2433                                 }
2434                         else
2435                                 {
2436                                 s2n(0,p);/*  null authenticator length  */
2437                                 n+=2;
2438                                 }
2439
2440                             tmp_buf[0]=s->client_version>>8;
2441                             tmp_buf[1]=s->client_version&0xff;
2442                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2443                                 goto err;
2444
2445                         /*  20010420 VRS.  Tried it this way; failed.
2446                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2447                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2448                         **                              kssl_ctx->length);
2449                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2450                         */
2451
2452                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2453                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2454                                 kssl_ctx->key,iv);
2455                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2456                                 sizeof tmp_buf);
2457                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2458                         outl += padl;
2459                         if (outl > (int)sizeof epms)
2460                                 {
2461                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2462                                 goto err;
2463                                 }
2464                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2465
2466                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2467                         s2n(outl,p);
2468                         memcpy(p, epms, outl);
2469                         p+=outl;
2470                         n+=outl + 2;
2471
2472                         s->session->master_key_length=
2473                                 s->method->ssl3_enc->generate_master_secret(s,
2474                                         s->session->master_key,
2475                                         tmp_buf, sizeof tmp_buf);
2476
2477                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2478                         OPENSSL_cleanse(epms, outl);
2479                         }
2480 #endif
2481 #ifndef OPENSSL_NO_DH
2482                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2483                         {
2484                         DH *dh_srvr,*dh_clnt;
2485                         SESS_CERT *scert = s->session->sess_cert;
2486
2487                         if (scert == NULL)
2488                                 {
2489                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2490                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2491                                 goto err;
2492                                 }
2493
2494                         if (scert->peer_dh_tmp != NULL)
2495                                 dh_srvr=scert->peer_dh_tmp;
2496                         else
2497                                 {
2498                                 /* we get them from the cert */
2499                                 int idx = scert->peer_cert_type;
2500                                 EVP_PKEY *spkey = NULL;
2501                                 dh_srvr = NULL;
2502                                 if (idx >= 0)
2503                                         spkey = X509_get_pubkey(
2504                                                 scert->peer_pkeys[idx].x509);
2505                                 if (spkey)
2506                                         {
2507                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2508                                         EVP_PKEY_free(spkey);
2509                                         }
2510                                 if (dh_srvr == NULL)
2511                                         {
2512                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2513                                             ERR_R_INTERNAL_ERROR);
2514                                         goto err;
2515                                         }
2516                                 }
2517                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2518                                 {
2519                                 /* Use client certificate key */
2520                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2521                                 dh_clnt = NULL;
2522                                 if (clkey)
2523                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2524                                 if (dh_clnt == NULL)
2525                                         {
2526                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2527                                             ERR_R_INTERNAL_ERROR);
2528                                         goto err;
2529                                         }
2530                                 }
2531                         else
2532                                 {
2533                                 /* generate a new random key */
2534                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2535                                         {
2536                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2537                                         goto err;
2538                                         }
2539                                 if (!DH_generate_key(dh_clnt))
2540                                         {
2541                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2542                                         DH_free(dh_clnt);
2543                                         goto err;
2544                                         }
2545                                 }
2546
2547                         /* use the 'p' output buffer for the DH key, but
2548                          * make sure to clear it out afterwards */
2549
2550                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2551                         if (scert->peer_dh_tmp == NULL)
2552                                 DH_free(dh_srvr);
2553
2554                         if (n <= 0)
2555                                 {
2556                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2557                                 DH_free(dh_clnt);
2558                                 goto err;
2559                                 }
2560
2561                         /* generate master key from the result */
2562                         s->session->master_key_length=
2563                                 s->method->ssl3_enc->generate_master_secret(s,
2564                                         s->session->master_key,p,n);
2565                         /* clean up */
2566                         memset(p,0,n);
2567
2568                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2569                                 n = 0;
2570                         else
2571                                 {
2572                                 /* send off the data */
2573                                 n=BN_num_bytes(dh_clnt->pub_key);
2574                                 s2n(n,p);
2575                                 BN_bn2bin(dh_clnt->pub_key,p);
2576                                 n+=2;
2577                                 }
2578
2579                         DH_free(dh_clnt);
2580
2581                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2582                         }
2583 #endif
2584
2585 #ifndef OPENSSL_NO_ECDH
2586                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2587                         {
2588                         const EC_GROUP *srvr_group = NULL;
2589                         EC_KEY *tkey;
2590                         int ecdh_clnt_cert = 0;
2591                         int field_size = 0;
2592
2593                         /* Did we send out the client's
2594                          * ECDH share for use in premaster
2595                          * computation as part of client certificate?
2596                          * If so, set ecdh_clnt_cert to 1.
2597                          */
2598                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2599                                 {
2600                                 /* XXX: For now, we do not support client
2601                                  * authentication using ECDH certificates.
2602                                  * To add such support, one needs to add
2603                                  * code that checks for appropriate
2604                                  * conditions and sets ecdh_clnt_cert to 1.
2605                                  * For example, the cert have an ECC
2606                                  * key on the same curve as the server's
2607                                  * and the key should be authorized for
2608                                  * key agreement.
2609                                  *
2610                                  * One also needs to add code in ssl3_connect
2611                                  * to skip sending the certificate verify
2612                                  * message.
2613                                  *
2614                                  * if ((s->cert->key->privatekey != NULL) &&
2615                                  *     (s->cert->key->privatekey->type ==
2616                                  *      EVP_PKEY_EC) && ...)
2617                                  * ecdh_clnt_cert = 1;
2618                                  */
2619                                 }
2620
2621                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2622                                 {
2623                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2624                                 }
2625                         else
2626                                 {
2627                                 /* Get the Server Public Key from Cert */
2628                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2629                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2630                                 if ((srvr_pub_pkey == NULL) ||
2631                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2632                                     (srvr_pub_pkey->pkey.ec == NULL))
2633                                         {
2634                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2635                                             ERR_R_INTERNAL_ERROR);
2636                                         goto err;
2637                                         }
2638
2639                                 tkey = srvr_pub_pkey->pkey.ec;
2640                                 }
2641
2642                         srvr_group   = EC_KEY_get0_group(tkey);
2643                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2644
2645                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2646                                 {
2647                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2648                                     ERR_R_INTERNAL_ERROR);
2649                                 goto err;
2650                                 }
2651
2652                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2653                                 {
2654                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2655                                 goto err;
2656                                 }
2657
2658                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2659                                 {
2660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2661                                 goto err;
2662                                 }
2663                         if (ecdh_clnt_cert)
2664                                 {
2665                                 /* Reuse key info from our certificate
2666                                  * We only need our private key to perform
2667                                  * the ECDH computation.
2668                                  */
2669                                 const BIGNUM *priv_key;
2670                                 tkey = s->cert->key->privatekey->pkey.ec;
2671                                 priv_key = EC_KEY_get0_private_key(tkey);
2672                                 if (priv_key == NULL)
2673                                         {
2674                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2675                                         goto err;
2676                                         }
2677                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2678                                         {
2679                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2680                                         goto err;
2681                                         }
2682                                 }
2683                         else
2684                                 {
2685                                 /* Generate a new ECDH key pair */
2686                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2687                                         {
2688                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2689                                         goto err;
2690                                         }
2691                                 }
2692
2693                         /* use the 'p' output buffer for the ECDH key, but
2694                          * make sure to clear it out afterwards
2695                          */
2696
2697                         field_size = EC_GROUP_get_degree(srvr_group);
2698                         if (field_size <= 0)
2699                                 {
2700                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2701                                        ERR_R_ECDH_LIB);
2702                                 goto err;
2703                                 }
2704                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2705                         if (n <= 0)
2706                                 {
2707                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2708                                        ERR_R_ECDH_LIB);
2709                                 goto err;
2710                                 }
2711
2712                         /* generate master key from the result */
2713                         s->session->master_key_length = s->method->ssl3_enc \
2714                             -> generate_master_secret(s,
2715                                 s->session->master_key,
2716                                 p, n);
2717
2718                         memset(p, 0, n); /* clean up */
2719
2720                         if (ecdh_clnt_cert)
2721                                 {
2722                                 /* Send empty client key exch message */
2723                                 n = 0;
2724                                 }
2725                         else
2726                                 {
2727                                 /* First check the size of encoding and
2728                                  * allocate memory accordingly.
2729                                  */
2730                                 encoded_pt_len =
2731                                     EC_POINT_point2oct(srvr_group,
2732                                         EC_KEY_get0_public_key(clnt_ecdh),
2733                                         POINT_CONVERSION_UNCOMPRESSED,
2734                                         NULL, 0, NULL);
2735
2736                                 encodedPoint = (unsigned char *)
2737                                     OPENSSL_malloc(encoded_pt_len *
2738                                         sizeof(unsigned char));
2739                                 bn_ctx = BN_CTX_new();
2740                                 if ((encodedPoint == NULL) ||
2741                                     (bn_ctx == NULL))
2742                                         {
2743                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2744                                         goto err;
2745                                         }
2746
2747                                 /* Encode the public key */
2748                                 n = EC_POINT_point2oct(srvr_group,
2749                                     EC_KEY_get0_public_key(clnt_ecdh),
2750                                     POINT_CONVERSION_UNCOMPRESSED,
2751                                     encodedPoint, encoded_pt_len, bn_ctx);
2752
2753                                 *p = n; /* length of encoded point */
2754                                 /* Encoded point will be copied here */
2755                                 p += 1;
2756                                 /* copy the point */
2757                                 memcpy((unsigned char *)p, encodedPoint, n);
2758                                 /* increment n to account for length field */
2759                                 n += 1;
2760                                 }
2761
2762                         /* Free allocated memory */
2763                         BN_CTX_free(bn_ctx);
2764                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2765                         if (clnt_ecdh != NULL)
2766                                  EC_KEY_free(clnt_ecdh);
2767                         EVP_PKEY_free(srvr_pub_pkey);
2768                         }
2769 #endif /* !OPENSSL_NO_ECDH */
2770                 else if (alg_k & SSL_kGOST)
2771                         {
2772                         /* GOST key exchange message creation */
2773                         EVP_PKEY_CTX *pkey_ctx;
2774                         X509 *peer_cert;
2775                         size_t msglen;
2776                         unsigned int md_len;
2777                         int keytype;
2778                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2779                         EVP_MD_CTX *ukm_hash;
2780                         EVP_PKEY *pub_key;
2781
2782                         /* Get server sertificate PKEY and create ctx from it */
2783                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2784                         if (!peer_cert)
2785                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2786                         if (!peer_cert)         {
2787                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2788                                         goto err;
2789                                 }
2790
2791                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2792                         /* If we have send a certificate, and certificate key
2793
2794                          * parameters match those of server certificate, use
2795                          * certificate key for key exchange
2796                          */
2797
2798                          /* Otherwise, generate ephemeral key pair */
2799
2800                         EVP_PKEY_encrypt_init(pkey_ctx);
2801                           /* Generate session key */
2802                     RAND_bytes(premaster_secret,32);
2803                         /* If we have client certificate, use its secret as peer key */
2804                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2805                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2806                                         /* If there was an error - just ignore it. Ephemeral key
2807                                         * would be used
2808                                         */
2809                                         ERR_clear_error();
2810                                 }
2811                         }
2812                         /* Compute shared IV and store it in algorithm-specific
2813                          * context data */
2814                         ukm_hash = EVP_MD_CTX_create();
2815                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2816                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2817                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2818                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2819                         EVP_MD_CTX_destroy(ukm_hash);
2820                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2821                                 8,shared_ukm)<0) {
2822                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2823                                                 SSL_R_LIBRARY_BUG);
2824                                         goto err;
2825                                 }
2826                         /* Make GOST keytransport blob message */
2827                         /*Encapsulate it into sequence */
2828                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2829                         msglen=255;
2830                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2831                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2832                                         SSL_R_LIBRARY_BUG);
2833                                 goto err;
2834                         }
2835                         if (msglen >= 0x80)
2836                                 {
2837                                 *(p++)=0x81;
2838                                 *(p++)= msglen & 0xff;
2839                                 n=msglen+3;
2840                                 }
2841                         else
2842                                 {
2843                                 *(p++)= msglen & 0xff;
2844                                 n=msglen+2;
2845                                 }
2846                         memcpy(p, tmp, msglen);
2847                         /* Check if pubkey from client certificate was used */
2848                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2849                                 {
2850                                 /* Set flag "skip certificate verify" */
2851                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2852                                 }
2853                         EVP_PKEY_CTX_free(pkey_ctx);
2854                         s->session->master_key_length=
2855                                 s->method->ssl3_enc->generate_master_secret(s,
2856                                         s->session->master_key,premaster_secret,32);
2857                         EVP_PKEY_free(pub_key);
2858
2859                         }
2860 #ifndef OPENSSL_NO_SRP
2861                 else if (alg_k & SSL_kSRP)
2862                         {
2863                         if (s->srp_ctx.A != NULL)
2864                                 {
2865                                 /* send off the data */
2866                                 n=BN_num_bytes(s->srp_ctx.A);
2867                                 s2n(n,p);
2868                                 BN_bn2bin(s->srp_ctx.A,p);
2869                                 n+=2;
2870                                 }
2871                         else
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2874                                 goto err;
2875                                 }
2876                         if (s->session->srp_username != NULL)
2877                                 OPENSSL_free(s->session->srp_username);
2878                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2879                         if (s->session->srp_username == NULL)
2880                                 {
2881                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2882                                         ERR_R_MALLOC_FAILURE);
2883                                 goto err;
2884                                 }
2885
2886                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2887                                 {
2888                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2889                                 goto err;
2890                                 }
2891                         }
2892 #endif
2893 #ifndef OPENSSL_NO_PSK
2894                 else if (alg_k & SSL_kPSK)
2895                         {
2896                         char identity[PSK_MAX_IDENTITY_LEN];
2897                         unsigned char *t = NULL;
2898                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2899                         unsigned int pre_ms_len = 0, psk_len = 0;
2900                         int psk_err = 1;
2901
2902                         n = 0;
2903                         if (s->psk_client_callback == NULL)
2904                                 {
2905                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2906                                         SSL_R_PSK_NO_CLIENT_CB);
2907                                 goto err;
2908                                 }
2909
2910                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2911                                 identity, PSK_MAX_IDENTITY_LEN,
2912                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2913                         if (psk_len > PSK_MAX_PSK_LEN)
2914                                 {
2915                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2916                                         ERR_R_INTERNAL_ERROR);
2917                                 goto psk_err;
2918                                 }
2919                         else if (psk_len == 0)
2920                                 {
2921                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2922                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2923                                 goto psk_err;
2924                                 }
2925
2926                         /* create PSK pre_master_secret */
2927                         pre_ms_len = 2+psk_len+2+psk_len;
2928                         t = psk_or_pre_ms;
2929                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2930                         s2n(psk_len, t);
2931                         memset(t, 0, psk_len);
2932                         t+=psk_len;
2933                         s2n(psk_len, t);
2934
2935                         if (s->session->psk_identity_hint != NULL)
2936                                 OPENSSL_free(s->session->psk_identity_hint);
2937                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2938                         if (s->ctx->psk_identity_hint != NULL &&
2939                                 s->session->psk_identity_hint == NULL)
2940                                 {
2941                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2942                                         ERR_R_MALLOC_FAILURE);
2943                                 goto psk_err;
2944                                 }
2945
2946                         if (s->session->psk_identity != NULL)
2947                                 OPENSSL_free(s->session->psk_identity);
2948                         s->session->psk_identity = BUF_strdup(identity);
2949                         if (s->session->psk_identity == NULL)
2950                                 {
2951                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2952                                         ERR_R_MALLOC_FAILURE);
2953                                 goto psk_err;
2954                                 }
2955
2956                         s->session->master_key_length =
2957                                 s->method->ssl3_enc->generate_master_secret(s,
2958                                         s->session->master_key,
2959                                         psk_or_pre_ms, pre_ms_len);
2960                         n = strlen(identity);
2961                         s2n(n, p);
2962                         memcpy(p, identity, n);
2963                         n+=2;
2964                         psk_err = 0;
2965                 psk_err:
2966                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2967                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2968                         if (psk_err != 0)
2969                                 {
2970                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2971                                 goto err;
2972                                 }
2973                         }
2974 #endif
2975                 else
2976                         {
2977                         ssl3_send_alert(s, SSL3_AL_FATAL,
2978                             SSL_AD_HANDSHAKE_FAILURE);
2979                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2980                             ERR_R_INTERNAL_ERROR);
2981                         goto err;
2982                         }
2983
2984                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2985                 l2n3(n,d);
2986
2987                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2988                 /* number of bytes to write */
2989                 s->init_num=n+4;
2990                 s->init_off=0;
2991                 }
2992
2993         /* SSL3_ST_CW_KEY_EXCH_B */
2994         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2995 err:
2996 #ifndef OPENSSL_NO_ECDH
2997         BN_CTX_free(bn_ctx);
2998         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2999         if (clnt_ecdh != NULL)
3000                 EC_KEY_free(clnt_ecdh);
3001         EVP_PKEY_free(srvr_pub_pkey);
3002 #endif
3003         return(-1);
3004         }
3005
3006 int ssl3_send_client_verify(SSL *s)
3007         {
3008         unsigned char *p,*d;
3009         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3010         EVP_PKEY *pkey;
3011         EVP_PKEY_CTX *pctx=NULL;
3012         EVP_MD_CTX mctx;
3013         unsigned u=0;
3014         unsigned long n;
3015         int j;
3016
3017         EVP_MD_CTX_init(&mctx);
3018
3019         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3020                 {
3021                 d=(unsigned char *)s->init_buf->data;
3022                 p= &(d[4]);
3023                 pkey=s->cert->key->privatekey;
3024 /* Create context from key and test if sha1 is allowed as digest */
3025                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3026                 EVP_PKEY_sign_init(pctx);
3027                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3028                         {
3029                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3030                                 s->method->ssl3_enc->cert_verify_mac(s,
3031                                                 NID_sha1,
3032                                                 &(data[MD5_DIGEST_LENGTH]));
3033                         }
3034                 else
3035                         {
3036                         ERR_clear_error();
3037                         }
3038                 /* For TLS v1.2 send signature algorithm and signature
3039                  * using agreed digest and cached handshake records.
3040                  */
3041                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3042                         {
3043                         long hdatalen = 0;
3044                         void *hdata;
3045                         const EVP_MD *md = s->cert->key->digest;
3046                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3047                                                                 &hdata);
3048                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3049                                 {
3050                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3051                                                 ERR_R_INTERNAL_ERROR);
3052                                 goto err;
3053                                 }
3054                         p += 2;
3055 #ifdef SSL_DEBUG
3056                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3057                                                         EVP_MD_name(md));
3058 #endif
3059                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3060                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3061                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3062                                 {
3063                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3064                                                 ERR_R_EVP_LIB);
3065                                 goto err;
3066                                 }
3067                         s2n(u,p);
3068                         n = u + 4;
3069                         if (!ssl3_digest_cached_records(s))
3070                                 goto err;
3071                         }
3072                 else
3073 #ifndef OPENSSL_NO_RSA
3074                 if (pkey->type == EVP_PKEY_RSA)
3075                         {
3076                         s->method->ssl3_enc->cert_verify_mac(s,
3077                                 NID_md5,
3078                                 &(data[0]));
3079                         if (RSA_sign(NID_md5_sha1, data,
3080                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3081                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3082                                 {
3083                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3084                                 goto err;
3085                                 }
3086                         s2n(u,p);
3087                         n=u+2;
3088                         }
3089                 else
3090 #endif
3091 #ifndef OPENSSL_NO_DSA
3092                         if (pkey->type == EVP_PKEY_DSA)
3093                         {
3094                         if (!DSA_sign(pkey->save_type,
3095                                 &(data[MD5_DIGEST_LENGTH]),
3096                                 SHA_DIGEST_LENGTH,&(p[2]),
3097                                 (unsigned int *)&j,pkey->pkey.dsa))
3098                                 {
3099                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3100                                 goto err;
3101                                 }
3102                         s2n(j,p);
3103                         n=j+2;
3104                         }
3105                 else
3106 #endif
3107 #ifndef OPENSSL_NO_ECDSA
3108                         if (pkey->type == EVP_PKEY_EC)
3109                         {
3110                         if (!ECDSA_sign(pkey->save_type,
3111                                 &(data[MD5_DIGEST_LENGTH]),
3112                                 SHA_DIGEST_LENGTH,&(p[2]),
3113                                 (unsigned int *)&j,pkey->pkey.ec))
3114                                 {
3115                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3116                                     ERR_R_ECDSA_LIB);
3117                                 goto err;
3118                                 }
3119                         s2n(j,p);
3120                         n=j+2;
3121                         }
3122                 else
3123 #endif
3124                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3125                 {
3126                 unsigned char signbuf[64];
3127                 int i;
3128                 size_t sigsize=64;
3129                 s->method->ssl3_enc->cert_verify_mac(s,
3130                         NID_id_GostR3411_94,
3131                         data);
3132                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3133                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3134                         ERR_R_INTERNAL_ERROR);
3135                         goto err;
3136                 }
3137                 for (i=63,j=0; i>=0; j++, i--) {
3138                         p[2+j]=signbuf[i];
3139                 }
3140                 s2n(j,p);
3141                 n=j+2;
3142                 }
3143                 else
3144                 {
3145                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3146                         goto err;
3147                 }
3148                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3149                 l2n3(n,d);
3150
3151                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3152                 s->init_num=(int)n+4;
3153                 s->init_off=0;
3154                 }
3155         EVP_MD_CTX_cleanup(&mctx);
3156         EVP_PKEY_CTX_free(pctx);
3157         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3158 err:
3159         EVP_MD_CTX_cleanup(&mctx);
3160         EVP_PKEY_CTX_free(pctx);
3161         return(-1);
3162         }
3163
3164 /* Check a certificate can be used for client authentication. Currently
3165  * just check cert exists and if static DH client certificates can be used.
3166  */
3167 static int ssl3_check_client_certificate(SSL *s)
3168         {
3169         unsigned long alg_k;
3170         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3171                 return 0;
3172         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3173         /* See if we can use client certificate for fixed DH */
3174         if (alg_k & (SSL_kDHr|SSL_kDHd))
3175                 {
3176                 SESS_CERT *scert = s->session->sess_cert;
3177                 int i = scert->peer_cert_type;
3178                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3179                 clkey = s->cert->key->privatekey;
3180                 /* If client key not DH assume it can be used */
3181                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3182                         return 1;
3183                 if (i >= 0)
3184                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3185                 if (spkey)
3186                         {
3187                         /* Compare server and client parameters */
3188                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3189                         EVP_PKEY_free(spkey);
3190                         if (i != 1)
3191                                 return 0;
3192                         }
3193                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3194                 }
3195         return 1;
3196         }
3197
3198 int ssl3_send_client_certificate(SSL *s)
3199         {
3200         X509 *x509=NULL;
3201         EVP_PKEY *pkey=NULL;
3202         int i;
3203         unsigned long l;
3204
3205         if (s->state == SSL3_ST_CW_CERT_A)
3206                 {
3207                 /* Let cert callback update client certificates if required */
3208                 if (s->cert->cert_cb
3209                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3210                         {
3211                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3212                         return 0;
3213                         }
3214                 if (ssl3_check_client_certificate(s))
3215                         s->state=SSL3_ST_CW_CERT_C;
3216                 else
3217                         s->state=SSL3_ST_CW_CERT_B;
3218                 }
3219
3220         /* We need to get a client cert */
3221         if (s->state == SSL3_ST_CW_CERT_B)
3222                 {
3223                 /* If we get an error, we need to
3224                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3225                  * We then get retied later */
3226                 i=0;
3227                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3228                 if (i < 0)
3229                         {
3230                         s->rwstate=SSL_X509_LOOKUP;
3231                         return(-1);
3232                         }
3233                 s->rwstate=SSL_NOTHING;
3234                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3235                         {
3236                         s->state=SSL3_ST_CW_CERT_B;
3237                         if (    !SSL_use_certificate(s,x509) ||
3238                                 !SSL_use_PrivateKey(s,pkey))
3239                                 i=0;
3240                         }
3241                 else if (i == 1)
3242                         {
3243                         i=0;
3244                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3245                         }
3246
3247                 if (x509 != NULL) X509_free(x509);
3248                 if (pkey != NULL) EVP_PKEY_free(pkey);
3249                 if (i && !ssl3_check_client_certificate(s))
3250                         i = 0;
3251                 if (i == 0)
3252                         {
3253                         if (s->version == SSL3_VERSION)
3254                                 {
3255                                 s->s3->tmp.cert_req=0;
3256                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3257                                 return(1);
3258                                 }
3259                         else
3260                                 {
3261                                 s->s3->tmp.cert_req=2;
3262                                 }
3263                         }
3264
3265                 /* Ok, we have a cert */
3266                 s->state=SSL3_ST_CW_CERT_C;
3267                 }
3268
3269         if (s->state == SSL3_ST_CW_CERT_C)
3270                 {
3271                 s->state=SSL3_ST_CW_CERT_D;
3272                 l=ssl3_output_cert_chain(s,
3273                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3274                 s->init_num=(int)l;
3275                 s->init_off=0;
3276                 }
3277         /* SSL3_ST_CW_CERT_D */
3278         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3279         }
3280
3281 #define has_bits(i,m)   (((i)&(m)) == (m))
3282
3283 int ssl3_check_cert_and_algorithm(SSL *s)
3284         {
3285         int i,idx;
3286         long alg_k,alg_a;
3287         EVP_PKEY *pkey=NULL;
3288         SESS_CERT *sc;
3289 #ifndef OPENSSL_NO_RSA
3290         RSA *rsa;
3291 #endif
3292 #ifndef OPENSSL_NO_DH
3293         DH *dh;
3294 #endif
3295
3296         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3297         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3298
3299         /* we don't have a certificate */
3300         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3301                 return(1);
3302
3303         sc=s->session->sess_cert;
3304         if (sc == NULL)
3305                 {
3306                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3307                 goto err;
3308                 }
3309
3310 #ifndef OPENSSL_NO_RSA
3311         rsa=s->session->sess_cert->peer_rsa_tmp;
3312 #endif
3313 #ifndef OPENSSL_NO_DH
3314         dh=s->session->sess_cert->peer_dh_tmp;
3315 #endif
3316
3317         /* This is the passed certificate */
3318
3319         idx=sc->peer_cert_type;
3320 #ifndef OPENSSL_NO_ECDH
3321         if (idx == SSL_PKEY_ECC)
3322                 {
3323                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3324                                                                 s) == 0)
3325                         { /* check failed */
3326                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3327                         goto f_err;
3328                         }
3329                 else
3330                         {
3331                         return 1;
3332                         }
3333                 }
3334 #endif
3335         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3336         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3337         EVP_PKEY_free(pkey);
3338
3339
3340         /* Check that we have a certificate if we require one */
3341         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3342                 {
3343                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3344                 goto f_err;
3345                 }
3346 #ifndef OPENSSL_NO_DSA
3347         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3348                 {
3349                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3350                 goto f_err;
3351                 }
3352 #endif
3353 #ifndef OPENSSL_NO_RSA
3354         if ((alg_k & SSL_kRSA) &&
3355                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3356                 {
3357                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3358                 goto f_err;
3359                 }
3360 #endif
3361 #ifndef OPENSSL_NO_DH
3362         if ((alg_k & SSL_kEDH) &&
3363                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3364                 {
3365                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3366                 goto f_err;
3367                 }
3368         else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3369                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3370                 {
3371                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3372                 goto f_err;
3373                 }
3374 #ifndef OPENSSL_NO_DSA
3375         else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3376                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3377                 {
3378                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3379                 goto f_err;
3380                 }
3381 #endif
3382 #endif
3383
3384         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3385                 {
3386 #ifndef OPENSSL_NO_RSA
3387                 if (alg_k & SSL_kRSA)
3388                         {
3389                         if (rsa == NULL
3390                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3391                                 {
3392                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3393                                 goto f_err;
3394                                 }
3395                         }
3396                 else
3397 #endif
3398 #ifndef OPENSSL_NO_DH
3399                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3400                             {
3401                             if (dh == NULL
3402                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3403                                 {
3404                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3405                                 goto f_err;
3406                                 }
3407                         }
3408                 else
3409 #endif
3410                         {
3411                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3412                         goto f_err;
3413                         }
3414                 }
3415         return(1);
3416 f_err:
3417         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3418 err:
3419         return(0);
3420         }
3421
3422 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3423 int ssl3_send_next_proto(SSL *s)
3424         {
3425         unsigned int len, padding_len;
3426         unsigned char *d;
3427
3428         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3429                 {
3430                 len = s->next_proto_negotiated_len;
3431                 padding_len = 32 - ((len + 2) % 32);
3432                 d = (unsigned char *)s->init_buf->data;
3433                 d[4] = len;
3434                 memcpy(d + 5, s->next_proto_negotiated, len);
3435                 d[5 + len] = padding_len;
3436                 memset(d + 6 + len, 0, padding_len);
3437                 *(d++)=SSL3_MT_NEXT_PROTO;
3438                 l2n3(2 + len + padding_len, d);
3439                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3440                 s->init_num = 4 + 2 + len + padding_len;
3441                 s->init_off = 0;
3442                 }
3443
3444         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3445 }
3446 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3447
3448 /* Check to see if handshake is full or resumed. Usually this is just a
3449  * case of checking to see if a cache hit has occurred. In the case of
3450  * session tickets we have to check the next message to be sure.
3451  */
3452
3453 #ifndef OPENSSL_NO_TLSEXT
3454 int ssl3_check_finished(SSL *s)
3455         {
3456         int ok;
3457         long n;
3458         /* If we have no ticket it cannot be a resumed session. */
3459         if (!s->session->tlsext_tick)
3460                 return 1;
3461         /* this function is called when we really expect a Certificate
3462          * message, so permit appropriate message length */
3463         n=s->method->ssl_get_message(s,
3464                 SSL3_ST_CR_CERT_A,
3465                 SSL3_ST_CR_CERT_B,
3466                 -1,
3467                 s->max_cert_list,
3468                 &ok);
3469         if (!ok) return((int)n);
3470         s->s3->tmp.reuse_message = 1;
3471         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3472                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3473                 return 2;
3474
3475         return 1;
3476         }
3477 #endif
3478
3479 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3480         {
3481         int i = 0;
3482 #ifndef OPENSSL_NO_ENGINE
3483         if (s->ctx->client_cert_engine)
3484                 {
3485                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3486                                                 SSL_get_client_CA_list(s),
3487                                                 px509, ppkey, NULL, NULL, NULL);
3488                 if (i != 0)
3489                         return i;
3490                 }
3491 #endif
3492         if (s->ctx->client_cert_cb)
3493                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3494         return i;
3495         }
3496
3497 #ifndef OPENSSL_NO_TLSEXT
3498 int tls1_get_server_supplemental_data(SSL *s)
3499         {
3500         int al;
3501         int ok;
3502         unsigned long supp_data_len, authz_data_len;
3503         long n;
3504         unsigned short supp_data_type, authz_data_type, proof_len;
3505         const unsigned char *p;
3506         unsigned char *new_proof;
3507
3508         n=s->method->ssl_get_message(s,
3509                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3510                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3511                 SSL3_MT_SUPPLEMENTAL_DATA,
3512                 /* use default limit */
3513                 TLSEXT_MAXLEN_supplemental_data,
3514                 &ok);
3515
3516         if (!ok) return((int)n);
3517
3518         p = (unsigned char *)s->init_msg;
3519
3520         /* The message cannot be empty */
3521         if (n < 3)
3522                 {
3523                 al = SSL_AD_DECODE_ERROR;
3524                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3525                 goto f_err;
3526                 }
3527         /* Length of supplemental data */
3528         n2l3(p,supp_data_len);
3529         n -= 3;
3530         /* We must have at least one supplemental data entry
3531          * with type (1 byte) and length (2 bytes). */
3532         if (supp_data_len != (unsigned long) n || n < 4)
3533                 {
3534                 al = SSL_AD_DECODE_ERROR;
3535                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3536                 goto f_err;
3537                 }
3538         /* Supplemental data type: must be authz_data */
3539         n2s(p,supp_data_type);
3540         n -= 2;
3541         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3542                 {
3543                 al = SSL_AD_UNEXPECTED_MESSAGE;
3544                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3545                 goto f_err;
3546                 }
3547         /* Authz data length */
3548         n2s(p, authz_data_len);
3549         n -= 2;
3550         if (authz_data_len != (unsigned long) n || n < 1)
3551                 {
3552                 al = SSL_AD_DECODE_ERROR;
3553                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3554                 goto f_err;
3555                 }
3556         /* Authz data type: must be audit_proof */
3557         authz_data_type = *(p++);
3558         n -= 1;
3559         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3560                 {
3561                 al=SSL_AD_UNEXPECTED_MESSAGE;
3562                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3563                 goto f_err;
3564                 }
3565         /* We have a proof: read its length */
3566         if (n < 2)
3567                 {
3568                 al = SSL_AD_DECODE_ERROR;
3569                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3570                 goto f_err;
3571                 }
3572         n2s(p, proof_len);
3573         n -= 2;
3574         if (proof_len != (unsigned long) n)
3575                 {
3576                 al = SSL_AD_DECODE_ERROR;
3577                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3578                 goto f_err;
3579                 }
3580         /* Store the proof */
3581         new_proof = OPENSSL_realloc(s->session->audit_proof,
3582                                     proof_len);
3583         if (new_proof == NULL)
3584                 {
3585                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3586                 return 0;
3587                 }
3588         s->session->audit_proof_length = proof_len;
3589         s->session->audit_proof = new_proof;
3590         memcpy(s->session->audit_proof, p, proof_len);
3591
3592         /* Got the proof, but can't verify it yet. */
3593         return 1;
3594 f_err:
3595         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3596         return -1;
3597         }
3598 #endif