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         unsigned char *p,*d;
 841         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 842         unsigned int j;
 843         long n;
 844 #ifndef OPENSSL_NO_COMP
 845         SSL_COMP *comp;
 846 #endif
 847
 848         n=s->method->ssl_get_message(s,
 849                 SSL3_ST_CR_SRVR_HELLO_A,
 850                 SSL3_ST_CR_SRVR_HELLO_B,
 851                 -1,
 852                 20000, /* ?? */
 853                 &ok);
 854
 855         if (!ok) return((int)n);
 856
 857         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 858                 {
 859                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 860                         {
 861                         if ( s->d1->send_cookie == 0)
 862                                 {
 863                                 s->s3->tmp.reuse_message = 1;
 864                                 return 1;
 865                                 }
 866                         else /* already sent a cookie */
 867                                 {
 868                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 869                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 870                                 goto f_err;
 871                                 }
 872                         }
 873                 }
 874
 875         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 876                 {
 877                 al=SSL_AD_UNEXPECTED_MESSAGE;
 878                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 879                 goto f_err;
 880                 }
 881
 882         d=p=(unsigned char *)s->init_msg;
 883
 884         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 885                 {
 886                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 887                 s->version=(s->version&0xff00)|p[1];
 888                 al=SSL_AD_PROTOCOL_VERSION;
 889                 goto f_err;
 890                 }
 891         p+=2;
 892
 893         /* load the server hello data */
 894         /* load the server random */
 895         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 896         p+=SSL3_RANDOM_SIZE;
 897
 898         /* get the session-id */
 899         j= *(p++);
 900
 901         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 902                 {
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 905                 goto f_err;
 906                 }
 907
 908 #ifndef OPENSSL_NO_TLSEXT
 909         /* check if we want to resume the session based on external pre-shared secret */
 910         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 911                 {
 912                 SSL_CIPHER *pref_cipher=NULL;
 913                 s->session->master_key_length=sizeof(s->session->master_key);
 914                 if (s->tls_session_secret_cb(s, s->session->master_key,
 915                                              &s->session->master_key_length,
 916                                              NULL, &pref_cipher,
 917                                              s->tls_session_secret_cb_arg))
 918                         {
 919                         s->session->cipher = pref_cipher ?
 920                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 921                         }
 922                 }
 923 #endif /* OPENSSL_NO_TLSEXT */
 924
 925         if (j != 0 && j == s->session->session_id_length
 926             && memcmp(p,s->session->session_id,j) == 0)
 927             {
 928             if(s->sid_ctx_length != s->session->sid_ctx_length
 929                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 930                 {
 931                 /* actually a client application bug */
 932                 al=SSL_AD_ILLEGAL_PARAMETER;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 934                 goto f_err;
 935                 }
 936             s->hit=1;
 937             }
 938         else    /* a miss or crap from the other end */
 939                 {
 940                 /* If we were trying for session-id reuse, make a new
 941                  * SSL_SESSION so we don't stuff up other people */
 942                 s->hit=0;
 943                 if (s->session->session_id_length > 0)
 944                         {
 945                         if (!ssl_get_new_session(s,0))
 946                                 {
 947                                 goto f_err;
 948                                 }
 949                         }
 950                 s->session->session_id_length=j;
 951                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 952                 }
 953         p+=j;
 954         c=ssl_get_cipher_by_char(s,p);
 955         if (c == NULL)
 956                 {
 957                 /* unknown cipher */
 958                 al=SSL_AD_ILLEGAL_PARAMETER;
 959                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 960                 goto f_err;
 961                 }
 962         /* TLS v1.2 only ciphersuites require v1.2 or later */
 963         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 964                 (TLS1_get_version(s) < TLS1_2_VERSION))
 965                 {
 966                 al=SSL_AD_ILLEGAL_PARAMETER;
 967                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 968                 goto f_err;
 969                 }
 970         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 971
 972         sk=ssl_get_ciphers_by_id(s);
 973         i=sk_SSL_CIPHER_find(sk,c);
 974         if (i < 0)
 975                 {
 976                 /* we did not say we would use this cipher */
 977                 al=SSL_AD_ILLEGAL_PARAMETER;
 978                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 979                 goto f_err;
 980                 }
 981
 982         /* Depending on the session caching (internal/external), the cipher
 983            and/or cipher_id values may not be set. Make sure that
 984            cipher_id is set and use it for comparison. */
 985         if (s->session->cipher)
 986                 s->session->cipher_id = s->session->cipher->id;
 987         if (s->hit && (s->session->cipher_id != c->id))
 988                 {
 989 /* Workaround is now obsolete */
 990 #if 0
 991                 if (!(s->options &
 992                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 993 #endif
 994                         {
 995                         al=SSL_AD_ILLEGAL_PARAMETER;
 996                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 997                         goto f_err;
 998                         }
 999                 }
1000         s->s3->tmp.new_cipher=c;
1001         /* Don't digest cached records if TLS v1.2: we may need them for
1002          * client authentication.
1003          */
1004         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1005                 goto f_err;
1006         /* lets get the compression algorithm */
1007         /* COMPRESSION */
1008 #ifdef OPENSSL_NO_COMP
1009         if (*(p++) != 0)
1010                 {
1011                 al=SSL_AD_ILLEGAL_PARAMETER;
1012                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1013                 goto f_err;
1014                 }
1015         /* If compression is disabled we'd better not try to resume a session
1016          * using compression.
1017          */
1018         if (s->session->compress_meth != 0)
1019                 {
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1021                 goto f_err;
1022                 }
1023 #else
1024         j= *(p++);
1025         if (s->hit && j != s->session->compress_meth)
1026                 {
1027                 al=SSL_AD_ILLEGAL_PARAMETER;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1029                 goto f_err;
1030                 }
1031         if (j == 0)
1032                 comp=NULL;
1033         else if (s->options & SSL_OP_NO_COMPRESSION)
1034                 {
1035                 al=SSL_AD_ILLEGAL_PARAMETER;
1036                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1037                 goto f_err;
1038                 }
1039         else
1040                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1041
1042         if ((j != 0) && (comp == NULL))
1043                 {
1044                 al=SSL_AD_ILLEGAL_PARAMETER;
1045                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1046                 goto f_err;
1047                 }
1048         else
1049                 {
1050                 s->s3->tmp.new_compression=comp;
1051                 }
1052 #endif
1053
1054 #ifndef OPENSSL_NO_TLSEXT
1055         /* TLS extensions*/
1056         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1057                 {
1058                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1059                 goto err;
1060                 }
1061 #endif
1062
1063         if (p != (d+n))
1064                 {
1065                 /* wrong packet length */
1066                 al=SSL_AD_DECODE_ERROR;
1067                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1068                 goto f_err;
1069                 }
1070
1071         return(1);
1072 f_err:
1073         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1074 err:
1075         return(-1);
1076         }
1077
1078 int ssl3_get_server_certificate(SSL *s)
1079         {
1080         int al,i,ok,ret= -1;
1081         unsigned long n,nc,llen,l;
1082         X509 *x=NULL;
1083         const unsigned char *q,*p;
1084         unsigned char *d;
1085         STACK_OF(X509) *sk=NULL;
1086         SESS_CERT *sc;
1087         EVP_PKEY *pkey=NULL;
1088         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1089
1090         n=s->method->ssl_get_message(s,
1091                 SSL3_ST_CR_CERT_A,
1092                 SSL3_ST_CR_CERT_B,
1093                 -1,
1094                 s->max_cert_list,
1095                 &ok);
1096
1097         if (!ok) return((int)n);
1098
1099         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1100                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1101                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1102                 {
1103                 s->s3->tmp.reuse_message=1;
1104                 return(1);
1105                 }
1106
1107         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1108                 {
1109                 al=SSL_AD_UNEXPECTED_MESSAGE;
1110                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1111                 goto f_err;
1112                 }
1113         p=d=(unsigned char *)s->init_msg;
1114
1115         if ((sk=sk_X509_new_null()) == NULL)
1116                 {
1117                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1118                 goto err;
1119                 }
1120
1121         n2l3(p,llen);
1122         if (llen+3 != n)
1123                 {
1124                 al=SSL_AD_DECODE_ERROR;
1125                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1126                 goto f_err;
1127                 }
1128         for (nc=0; nc<llen; )
1129                 {
1130                 n2l3(p,l);
1131                 if ((l+nc+3) > llen)
1132                         {
1133                         al=SSL_AD_DECODE_ERROR;
1134                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1135                         goto f_err;
1136                         }
1137
1138                 q=p;
1139                 x=d2i_X509(NULL,&q,l);
1140                 if (x == NULL)
1141                         {
1142                         al=SSL_AD_BAD_CERTIFICATE;
1143                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1144                         goto f_err;
1145                         }
1146                 if (q != (p+l))
1147                         {
1148                         al=SSL_AD_DECODE_ERROR;
1149                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1150                         goto f_err;
1151                         }
1152                 if (!sk_X509_push(sk,x))
1153                         {
1154                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1155                         goto err;
1156                         }
1157                 x=NULL;
1158                 nc+=l+3;
1159                 p=q;
1160                 }
1161
1162         i=ssl_verify_cert_chain(s,sk);
1163         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1164 #ifndef OPENSSL_NO_KRB5
1165             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1166                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1167 #endif /* OPENSSL_NO_KRB5 */
1168                 )
1169                 {
1170                 al=ssl_verify_alarm_type(s->verify_result);
1171                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1172                 goto f_err;
1173                 }
1174         ERR_clear_error(); /* but we keep s->verify_result */
1175
1176         sc=ssl_sess_cert_new();
1177         if (sc == NULL) goto err;
1178
1179         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1180         s->session->sess_cert=sc;
1181
1182         sc->cert_chain=sk;
1183         /* Inconsistency alert: cert_chain does include the peer's
1184          * certificate, which we don't include in s3_srvr.c */
1185         x=sk_X509_value(sk,0);
1186         sk=NULL;
1187         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1188
1189         pkey=X509_get_pubkey(x);
1190
1191         /* VRS: allow null cert if auth == KRB5 */
1192         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1193                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1194                     ? 0 : 1;
1195
1196 #ifdef KSSL_DEBUG
1197         printf("pkey,x = %p, %p\n", pkey,x);
1198         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1199         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1200                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1201 #endif    /* KSSL_DEBUG */
1202
1203         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1204                 {
1205                 x=NULL;
1206                 al=SSL3_AL_FATAL;
1207                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1208                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1209                 goto f_err;
1210                 }
1211
1212         i=ssl_cert_type(x,pkey);
1213         if (need_cert && i < 0)
1214                 {
1215                 x=NULL;
1216                 al=SSL3_AL_FATAL;
1217                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1218                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1219                 goto f_err;
1220                 }
1221
1222         if (need_cert)
1223                 {
1224                 sc->peer_cert_type=i;
1225                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1226                 /* Why would the following ever happen?
1227                  * We just created sc a couple of lines ago. */
1228                 if (sc->peer_pkeys[i].x509 != NULL)
1229                         X509_free(sc->peer_pkeys[i].x509);
1230                 sc->peer_pkeys[i].x509=x;
1231                 sc->peer_key= &(sc->peer_pkeys[i]);
1232
1233                 if (s->session->peer != NULL)
1234                         X509_free(s->session->peer);
1235                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1236                 s->session->peer=x;
1237                 }
1238         else
1239                 {
1240                 sc->peer_cert_type=i;
1241                 sc->peer_key= NULL;
1242
1243                 if (s->session->peer != NULL)
1244                         X509_free(s->session->peer);
1245                 s->session->peer=NULL;
1246                 }
1247         s->session->verify_result = s->verify_result;
1248
1249         x=NULL;
1250 #ifndef OPENSSL_NO_TLSEXT
1251         /* Check the audit proof. */
1252         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1253                 {
1254                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1255                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1256                 if (ret <= 0)
1257                         {
1258                         al = SSL_AD_BAD_CERTIFICATE;
1259                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1260                         goto f_err;
1261                         }
1262                 }
1263
1264 #endif
1265         ret=1;
1266
1267         if (0)
1268                 {
1269 f_err:
1270                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1271                 }
1272 err:
1273         EVP_PKEY_free(pkey);
1274         X509_free(x);
1275         sk_X509_pop_free(sk,X509_free);
1276         return(ret);
1277         }
1278
1279 int ssl3_get_key_exchange(SSL *s)
1280         {
1281 #ifndef OPENSSL_NO_RSA
1282         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1283 #endif
1284         EVP_MD_CTX md_ctx;
1285         unsigned char *param,*p;
1286         int al,i,j,param_len,ok;
1287         long n,alg_k,alg_a;
1288         EVP_PKEY *pkey=NULL;
1289         const EVP_MD *md = NULL;
1290 #ifndef OPENSSL_NO_RSA
1291         RSA *rsa=NULL;
1292 #endif
1293 #ifndef OPENSSL_NO_DH
1294         DH *dh=NULL;
1295 #endif
1296 #ifndef OPENSSL_NO_ECDH
1297         EC_KEY *ecdh = NULL;
1298         BN_CTX *bn_ctx = NULL;
1299         EC_POINT *srvr_ecpoint = NULL;
1300         int curve_nid = 0;
1301         int encoded_pt_len = 0;
1302 #endif
1303
1304         /* use same message size as in ssl3_get_certificate_request()
1305          * as ServerKeyExchange message may be skipped */
1306         n=s->method->ssl_get_message(s,
1307                 SSL3_ST_CR_KEY_EXCH_A,
1308                 SSL3_ST_CR_KEY_EXCH_B,
1309                 -1,
1310                 s->max_cert_list,
1311                 &ok);
1312         if (!ok) return((int)n);
1313
1314         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1315                 {
1316 #ifndef OPENSSL_NO_PSK
1317                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1318                    omitted if no identity hint is sent. Set
1319                    session->sess_cert anyway to avoid problems
1320                    later.*/
1321                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1322                         {
1323                         s->session->sess_cert=ssl_sess_cert_new();
1324                         if (s->ctx->psk_identity_hint)
1325                                 OPENSSL_free(s->ctx->psk_identity_hint);
1326                         s->ctx->psk_identity_hint = NULL;
1327                         }
1328 #endif
1329                 s->s3->tmp.reuse_message=1;
1330                 return(1);
1331                 }
1332
1333         param=p=(unsigned char *)s->init_msg;
1334         if (s->session->sess_cert != NULL)
1335                 {
1336 #ifndef OPENSSL_NO_RSA
1337                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1338                         {
1339                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1340                         s->session->sess_cert->peer_rsa_tmp=NULL;
1341                         }
1342 #endif
1343 #ifndef OPENSSL_NO_DH
1344                 if (s->session->sess_cert->peer_dh_tmp)
1345                         {
1346                         DH_free(s->session->sess_cert->peer_dh_tmp);
1347                         s->session->sess_cert->peer_dh_tmp=NULL;
1348                         }
1349 #endif
1350 #ifndef OPENSSL_NO_ECDH
1351                 if (s->session->sess_cert->peer_ecdh_tmp)
1352                         {
1353                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1354                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1355                         }
1356 #endif
1357                 }
1358         else
1359                 {
1360                 s->session->sess_cert=ssl_sess_cert_new();
1361                 }
1362
1363         param_len=0;
1364         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1365         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1366         EVP_MD_CTX_init(&md_ctx);
1367
1368 #ifndef OPENSSL_NO_PSK
1369         if (alg_k & SSL_kPSK)
1370                 {
1371                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1372
1373                 al=SSL_AD_HANDSHAKE_FAILURE;
1374                 n2s(p,i);
1375                 param_len=i+2;
1376                 /* Store PSK identity hint for later use, hint is used
1377                  * in ssl3_send_client_key_exchange.  Assume that the
1378                  * maximum length of a PSK identity hint can be as
1379                  * long as the maximum length of a PSK identity. */
1380                 if (i > PSK_MAX_IDENTITY_LEN)
1381                         {
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1383                                 SSL_R_DATA_LENGTH_TOO_LONG);
1384                         goto f_err;
1385                         }
1386                 if (param_len > n)
1387                         {
1388                         al=SSL_AD_DECODE_ERROR;
1389                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1390                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1391                         goto f_err;
1392                         }
1393                 /* If received PSK identity hint contains NULL
1394                  * characters, the hint is truncated from the first
1395                  * NULL. p may not be ending with NULL, so create a
1396                  * NULL-terminated string. */
1397                 memcpy(tmp_id_hint, p, i);
1398                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1399                 if (s->ctx->psk_identity_hint != NULL)
1400                         OPENSSL_free(s->ctx->psk_identity_hint);
1401                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1402                 if (s->ctx->psk_identity_hint == NULL)
1403                         {
1404                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1405                         goto f_err;
1406                         }
1407
1408                 p+=i;
1409                 n-=param_len;
1410                 }
1411         else
1412 #endif /* !OPENSSL_NO_PSK */
1413 #ifndef OPENSSL_NO_SRP
1414         if (alg_k & SSL_kSRP)
1415                 {
1416                 n2s(p,i);
1417                 param_len=i+2;
1418                 if (param_len > n)
1419                         {
1420                         al=SSL_AD_DECODE_ERROR;
1421                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1422                         goto f_err;
1423                         }
1424                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1425                         {
1426                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1427                         goto err;
1428                         }
1429                 p+=i;
1430
1431                 n2s(p,i);
1432                 param_len+=i+2;
1433                 if (param_len > n)
1434                         {
1435                         al=SSL_AD_DECODE_ERROR;
1436                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1437                         goto f_err;
1438                         }
1439                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1440                         {
1441                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1442                         goto err;
1443                         }
1444                 p+=i;
1445
1446                 i = (unsigned int)(p[0]);
1447                 p++;
1448                 param_len+=i+1;
1449                 if (param_len > n)
1450                         {
1451                         al=SSL_AD_DECODE_ERROR;
1452                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1453                         goto f_err;
1454                         }
1455                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1456                         {
1457                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1458                         goto err;
1459                         }
1460                 p+=i;
1461
1462                 n2s(p,i);
1463                 param_len+=i+2;
1464                 if (param_len > n)
1465                         {
1466                         al=SSL_AD_DECODE_ERROR;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1468                         goto f_err;
1469                         }
1470                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1471                         {
1472                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1473                         goto err;
1474                         }
1475                 p+=i;
1476                 n-=param_len;
1477
1478 /* We must check if there is a certificate */
1479 #ifndef OPENSSL_NO_RSA
1480                 if (alg_a & SSL_aRSA)
1481                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1482 #else
1483                 if (0)
1484                         ;
1485 #endif
1486 #ifndef OPENSSL_NO_DSA
1487                 else if (alg_a & SSL_aDSS)
1488                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1489 #endif
1490                 }
1491         else
1492 #endif /* !OPENSSL_NO_SRP */
1493 #ifndef OPENSSL_NO_RSA
1494         if (alg_k & SSL_kRSA)
1495                 {
1496                 if ((rsa=RSA_new()) == NULL)
1497                         {
1498                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1499                         goto err;
1500                         }
1501                 n2s(p,i);
1502                 param_len=i+2;
1503                 if (param_len > n)
1504                         {
1505                         al=SSL_AD_DECODE_ERROR;
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1507                         goto f_err;
1508                         }
1509                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1510                         {
1511                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1512                         goto err;
1513                         }
1514                 p+=i;
1515
1516                 n2s(p,i);
1517                 param_len+=i+2;
1518                 if (param_len > n)
1519                         {
1520                         al=SSL_AD_DECODE_ERROR;
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1522                         goto f_err;
1523                         }
1524                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1525                         {
1526                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1527                         goto err;
1528                         }
1529                 p+=i;
1530                 n-=param_len;
1531
1532                 /* this should be because we are using an export cipher */
1533                 if (alg_a & SSL_aRSA)
1534                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1535                 else
1536                         {
1537                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1538                         goto err;
1539                         }
1540                 s->session->sess_cert->peer_rsa_tmp=rsa;
1541                 rsa=NULL;
1542                 }
1543 #else /* OPENSSL_NO_RSA */
1544         if (0)
1545                 ;
1546 #endif
1547 #ifndef OPENSSL_NO_DH
1548         else if (alg_k & SSL_kEDH)
1549                 {
1550                 if ((dh=DH_new()) == NULL)
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1553                         goto err;
1554                         }
1555                 n2s(p,i);
1556                 param_len=i+2;
1557                 if (param_len > n)
1558                         {
1559                         al=SSL_AD_DECODE_ERROR;
1560                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1561                         goto f_err;
1562                         }
1563                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1566                         goto err;
1567                         }
1568                 p+=i;
1569
1570                 n2s(p,i);
1571                 param_len+=i+2;
1572                 if (param_len > n)
1573                         {
1574                         al=SSL_AD_DECODE_ERROR;
1575                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1576                         goto f_err;
1577                         }
1578                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1581                         goto err;
1582                         }
1583                 p+=i;
1584
1585                 n2s(p,i);
1586                 param_len+=i+2;
1587                 if (param_len > n)
1588                         {
1589                         al=SSL_AD_DECODE_ERROR;
1590                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1591                         goto f_err;
1592                         }
1593                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1594                         {
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1596                         goto err;
1597                         }
1598                 p+=i;
1599                 n-=param_len;
1600
1601 #ifndef OPENSSL_NO_RSA
1602                 if (alg_a & SSL_aRSA)
1603                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1604 #else
1605                 if (0)
1606                         ;
1607 #endif
1608 #ifndef OPENSSL_NO_DSA
1609                 else if (alg_a & SSL_aDSS)
1610                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1611 #endif
1612                 /* else anonymous DH, so no certificate or pkey. */
1613
1614                 s->session->sess_cert->peer_dh_tmp=dh;
1615                 dh=NULL;
1616                 }
1617         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1618                 {
1619                 al=SSL_AD_ILLEGAL_PARAMETER;
1620                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1621                 goto f_err;
1622                 }
1623 #endif /* !OPENSSL_NO_DH */
1624
1625 #ifndef OPENSSL_NO_ECDH
1626         else if (alg_k & SSL_kEECDH)
1627                 {
1628                 EC_GROUP *ngroup;
1629                 const EC_GROUP *group;
1630
1631                 if ((ecdh=EC_KEY_new()) == NULL)
1632                         {
1633                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1634                         goto err;
1635                         }
1636
1637                 /* Extract elliptic curve parameters and the
1638                  * server's ephemeral ECDH public key.
1639                  * Keep accumulating lengths of various components in
1640                  * param_len and make sure it never exceeds n.
1641                  */
1642
1643                 /* XXX: For now we only support named (not generic) curves
1644                  * and the ECParameters in this case is just three bytes.
1645                  */
1646                 param_len=3;
1647                 if ((param_len > n) ||
1648                     (*p != NAMED_CURVE_TYPE) ||
1649                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1650                         {
1651                         al=SSL_AD_INTERNAL_ERROR;
1652                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1653                         goto f_err;
1654                         }
1655
1656                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1657                 if (ngroup == NULL)
1658                         {
1659                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1660                         goto err;
1661                         }
1662                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1665                         goto err;
1666                         }
1667                 EC_GROUP_free(ngroup);
1668
1669                 group = EC_KEY_get0_group(ecdh);
1670
1671                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1672                     (EC_GROUP_get_degree(group) > 163))
1673                         {
1674                         al=SSL_AD_EXPORT_RESTRICTION;
1675                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1676                         goto f_err;
1677                         }
1678
1679                 p+=3;
1680
1681                 /* Next, get the encoded ECPoint */
1682                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1683                     ((bn_ctx = BN_CTX_new()) == NULL))
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1686                         goto err;
1687                         }
1688
1689                 encoded_pt_len = *p;  /* length of encoded point */
1690                 p+=1;
1691                 param_len += (1 + encoded_pt_len);
1692                 if ((param_len > n) ||
1693                     (EC_POINT_oct2point(group, srvr_ecpoint,
1694                         p, encoded_pt_len, bn_ctx) == 0))
1695                         {
1696                         al=SSL_AD_DECODE_ERROR;
1697                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1698                         goto f_err;
1699                         }
1700
1701                 n-=param_len;
1702                 p+=encoded_pt_len;
1703
1704                 /* The ECC/TLS specification does not mention
1705                  * the use of DSA to sign ECParameters in the server
1706                  * key exchange message. We do support RSA and ECDSA.
1707                  */
1708                 if (0) ;
1709 #ifndef OPENSSL_NO_RSA
1710                 else if (alg_a & SSL_aRSA)
1711                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1712 #endif
1713 #ifndef OPENSSL_NO_ECDSA
1714                 else if (alg_a & SSL_aECDSA)
1715                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1716 #endif
1717                 /* else anonymous ECDH, so no certificate or pkey. */
1718                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1719                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1720                 ecdh=NULL;
1721                 BN_CTX_free(bn_ctx);
1722                 bn_ctx = NULL;
1723                 EC_POINT_free(srvr_ecpoint);
1724                 srvr_ecpoint = NULL;
1725                 }
1726         else if (alg_k)
1727                 {
1728                 al=SSL_AD_UNEXPECTED_MESSAGE;
1729                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1730                 goto f_err;
1731                 }
1732 #endif /* !OPENSSL_NO_ECDH */
1733
1734
1735         /* p points to the next byte, there are 'n' bytes left */
1736
1737         /* if it was signed, check the signature */
1738         if (pkey != NULL)
1739                 {
1740                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1741                         {
1742                         int sigalg = tls12_get_sigid(pkey);
1743                         /* Should never happen */
1744                         if (sigalg == -1)
1745                                 {
1746                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1747                                 goto err;
1748                                 }
1749                         /* Check key type is consistent with signature */
1750                         if (sigalg != (int)p[1])
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1753                                 al=SSL_AD_DECODE_ERROR;
1754                                 goto f_err;
1755                                 }
1756                         md = tls12_get_hash(p[0]);
1757                         if (md == NULL)
1758                                 {
1759                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1760                                 al=SSL_AD_DECODE_ERROR;
1761                                 goto f_err;
1762                                 }
1763 #ifdef SSL_DEBUG
1764 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1765 #endif
1766                         p += 2;
1767                         n -= 2;
1768                         }
1769                 else
1770                         md = EVP_sha1();
1771
1772                 n2s(p,i);
1773                 n-=2;
1774                 j=EVP_PKEY_size(pkey);
1775
1776                 if ((i != n) || (n > j) || (n <= 0))
1777                         {
1778                         /* wrong packet length */
1779                         al=SSL_AD_DECODE_ERROR;
1780                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1781                         goto f_err;
1782                         }
1783
1784 #ifndef OPENSSL_NO_RSA
1785                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1786                         {
1787                         int num;
1788
1789                         j=0;
1790                         q=md_buf;
1791                         for (num=2; num > 0; num--)
1792                                 {
1793                                 EVP_MD_CTX_set_flags(&md_ctx,
1794                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1795                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1796                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1797                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1798                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1799                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1800                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1801                                 q+=i;
1802                                 j+=i;
1803                                 }
1804                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1805                                                                 pkey->pkey.rsa);
1806                         if (i < 0)
1807                                 {
1808                                 al=SSL_AD_DECRYPT_ERROR;
1809                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1810                                 goto f_err;
1811                                 }
1812                         if (i == 0)
1813                                 {
1814                                 /* bad signature */
1815                                 al=SSL_AD_DECRYPT_ERROR;
1816                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1817                                 goto f_err;
1818                                 }
1819                         }
1820                 else
1821 #endif
1822                         {
1823                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1824                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1825                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1826                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1827                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1828                                 {
1829                                 /* bad signature */
1830                                 al=SSL_AD_DECRYPT_ERROR;
1831                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1832                                 goto f_err;
1833                                 }
1834                         }
1835                 }
1836         else
1837                 {
1838                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1839                         /* aNULL or kPSK do not need public keys */
1840                         {
1841                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1842                         goto err;
1843                         }
1844                 /* still data left over */
1845                 if (n != 0)
1846                         {
1847                         al=SSL_AD_DECODE_ERROR;
1848                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1849                         goto f_err;
1850                         }
1851                 }
1852         EVP_PKEY_free(pkey);
1853         EVP_MD_CTX_cleanup(&md_ctx);
1854         return(1);
1855 f_err:
1856         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1857 err:
1858         EVP_PKEY_free(pkey);
1859 #ifndef OPENSSL_NO_RSA
1860         if (rsa != NULL)
1861                 RSA_free(rsa);
1862 #endif
1863 #ifndef OPENSSL_NO_DH
1864         if (dh != NULL)
1865                 DH_free(dh);
1866 #endif
1867 #ifndef OPENSSL_NO_ECDH
1868         BN_CTX_free(bn_ctx);
1869         EC_POINT_free(srvr_ecpoint);
1870         if (ecdh != NULL)
1871                 EC_KEY_free(ecdh);
1872 #endif
1873         EVP_MD_CTX_cleanup(&md_ctx);
1874         return(-1);
1875         }
1876
1877 int ssl3_get_certificate_request(SSL *s)
1878         {
1879         int ok,ret=0;
1880         unsigned long n,nc,l;
1881         unsigned int llen, ctype_num,i;
1882         X509_NAME *xn=NULL;
1883         const unsigned char *p,*q;
1884         unsigned char *d;
1885         STACK_OF(X509_NAME) *ca_sk=NULL;
1886
1887         n=s->method->ssl_get_message(s,
1888                 SSL3_ST_CR_CERT_REQ_A,
1889                 SSL3_ST_CR_CERT_REQ_B,
1890                 -1,
1891                 s->max_cert_list,
1892                 &ok);
1893
1894         if (!ok) return((int)n);
1895
1896         s->s3->tmp.cert_req=0;
1897
1898         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1899                 {
1900                 s->s3->tmp.reuse_message=1;
1901                 /* If we get here we don't need any cached handshake records
1902                  * as we wont be doing client auth.
1903                  */
1904                 if (s->s3->handshake_buffer)
1905                         {
1906                         if (!ssl3_digest_cached_records(s))
1907                                 goto err;
1908                         }
1909                 return(1);
1910                 }
1911
1912         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1913                 {
1914                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1915                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1916                 goto err;
1917                 }
1918
1919         /* TLS does not like anon-DH with client cert */
1920         if (s->version > SSL3_VERSION)
1921                 {
1922                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1923                         {
1924                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1925                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1926                         goto err;
1927                         }
1928                 }
1929
1930         p=d=(unsigned char *)s->init_msg;
1931
1932         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1933                 {
1934                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1935                 goto err;
1936                 }
1937
1938         /* get the certificate types */
1939         ctype_num= *(p++);
1940         if (s->cert->ctypes)
1941                 {
1942                 OPENSSL_free(s->cert->ctypes);
1943                 s->cert->ctypes = NULL;
1944                 }
1945         if (ctype_num > SSL3_CT_NUMBER)
1946                 {
1947                 /* If we exceed static buffer copy all to cert structure */
1948                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1949                 memcpy(s->cert->ctypes, p, ctype_num);
1950                 s->cert->ctype_num = (size_t)ctype_num;
1951                 ctype_num=SSL3_CT_NUMBER;
1952                 }
1953         for (i=0; i<ctype_num; i++)
1954                 s->s3->tmp.ctype[i]= p[i];
1955         p+=p[-1];
1956         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1957                 {
1958                 n2s(p, llen);
1959                 /* Check we have enough room for signature algorithms and
1960                  * following length value.
1961                  */
1962                 if ((unsigned long)(p - d + llen + 2) > n)
1963                         {
1964                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1965                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1966                         goto err;
1967                         }
1968                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1969                         {
1970                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1971                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1972                         goto err;
1973                         }
1974                 p += llen;
1975                 }
1976
1977         /* get the CA RDNs */
1978         n2s(p,llen);
1979 #if 0
1980 {
1981 FILE *out;
1982 out=fopen("/tmp/vsign.der","w");
1983 fwrite(p,1,llen,out);
1984 fclose(out);
1985 }
1986 #endif
1987
1988         if ((unsigned long)(p - d + llen) != n)
1989                 {
1990                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1991                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1992                 goto err;
1993                 }
1994
1995         for (nc=0; nc<llen; )
1996                 {
1997                 n2s(p,l);
1998                 if ((l+nc+2) > llen)
1999                         {
2000                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2001                                 goto cont; /* netscape bugs */
2002                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2003                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2004                         goto err;
2005                         }
2006
2007                 q=p;
2008
2009                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2010                         {
2011                         /* If netscape tolerance is on, ignore errors */
2012                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2013                                 goto cont;
2014                         else
2015                                 {
2016                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2017                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2018                                 goto err;
2019                                 }
2020                         }
2021
2022                 if (q != (p+l))
2023                         {
2024                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2025                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2026                         goto err;
2027                         }
2028                 if (!sk_X509_NAME_push(ca_sk,xn))
2029                         {
2030                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2031                         goto err;
2032                         }
2033
2034                 p+=l;
2035                 nc+=l+2;
2036                 }
2037
2038         if (0)
2039                 {
2040 cont:
2041                 ERR_clear_error();
2042                 }
2043
2044         /* we should setup a certificate to return.... */
2045         s->s3->tmp.cert_req=1;
2046         s->s3->tmp.ctype_num=ctype_num;
2047         if (s->s3->tmp.ca_names != NULL)
2048                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2049         s->s3->tmp.ca_names=ca_sk;
2050         ca_sk=NULL;
2051
2052         ret=1;
2053 err:
2054         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2055         return(ret);
2056         }
2057
2058 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2059         {
2060         return(X509_NAME_cmp(*a,*b));
2061         }
2062 #ifndef OPENSSL_NO_TLSEXT
2063 int ssl3_get_new_session_ticket(SSL *s)
2064         {
2065         int ok,al,ret=0, ticklen;
2066         long n;
2067         const unsigned char *p;
2068         unsigned char *d;
2069
2070         n=s->method->ssl_get_message(s,
2071                 SSL3_ST_CR_SESSION_TICKET_A,
2072                 SSL3_ST_CR_SESSION_TICKET_B,
2073                 -1,
2074                 16384,
2075                 &ok);
2076
2077         if (!ok)
2078                 return((int)n);
2079
2080         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2081                 {
2082                 s->s3->tmp.reuse_message=1;
2083                 return(1);
2084                 }
2085         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2086                 {
2087                 al=SSL_AD_UNEXPECTED_MESSAGE;
2088                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2089                 goto f_err;
2090                 }
2091         if (n < 6)
2092                 {
2093                 /* need at least ticket_lifetime_hint + ticket length */
2094                 al = SSL_AD_DECODE_ERROR;
2095                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2096                 goto f_err;
2097                 }
2098
2099         p=d=(unsigned char *)s->init_msg;
2100         n2l(p, s->session->tlsext_tick_lifetime_hint);
2101         n2s(p, ticklen);
2102         /* ticket_lifetime_hint + ticket_length + ticket */
2103         if (ticklen + 6 != n)
2104                 {
2105                 al = SSL_AD_DECODE_ERROR;
2106                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2107                 goto f_err;
2108                 }
2109         if (s->session->tlsext_tick)
2110                 {
2111                 OPENSSL_free(s->session->tlsext_tick);
2112                 s->session->tlsext_ticklen = 0;
2113                 }
2114         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2115         if (!s->session->tlsext_tick)
2116                 {
2117                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2118                 goto err;
2119                 }
2120         memcpy(s->session->tlsext_tick, p, ticklen);
2121         s->session->tlsext_ticklen = ticklen;
2122         /* There are two ways to detect a resumed ticket sesion.
2123          * One is to set an appropriate session ID and then the server
2124          * must return a match in ServerHello. This allows the normal
2125          * client session ID matching to work and we know much
2126          * earlier that the ticket has been accepted.
2127          *
2128          * The other way is to set zero length session ID when the
2129          * ticket is presented and rely on the handshake to determine
2130          * session resumption.
2131          *
2132          * We choose the former approach because this fits in with
2133          * assumptions elsewhere in OpenSSL. The session ID is set
2134          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2135          * ticket.
2136          */
2137         EVP_Digest(p, ticklen,
2138                         s->session->session_id, &s->session->session_id_length,
2139 #ifndef OPENSSL_NO_SHA256
2140                                                         EVP_sha256(), NULL);
2141 #else
2142                                                         EVP_sha1(), NULL);
2143 #endif
2144         ret=1;
2145         return(ret);
2146 f_err:
2147         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2148 err:
2149         return(-1);
2150         }
2151
2152 int ssl3_get_cert_status(SSL *s)
2153         {
2154         int ok, al;
2155         unsigned long resplen,n;
2156         const unsigned char *p;
2157
2158         n=s->method->ssl_get_message(s,
2159                 SSL3_ST_CR_CERT_STATUS_A,
2160                 SSL3_ST_CR_CERT_STATUS_B,
2161                 SSL3_MT_CERTIFICATE_STATUS,
2162                 16384,
2163                 &ok);
2164
2165         if (!ok) return((int)n);
2166         if (n < 4)
2167                 {
2168                 /* need at least status type + length */
2169                 al = SSL_AD_DECODE_ERROR;
2170                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2171                 goto f_err;
2172                 }
2173         p = (unsigned char *)s->init_msg;
2174         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2175                 {
2176                 al = SSL_AD_DECODE_ERROR;
2177                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2178                 goto f_err;
2179                 }
2180         n2l3(p, resplen);
2181         if (resplen + 4 != n)
2182                 {
2183                 al = SSL_AD_DECODE_ERROR;
2184                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2185                 goto f_err;
2186                 }
2187         if (s->tlsext_ocsp_resp)
2188                 OPENSSL_free(s->tlsext_ocsp_resp);
2189         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2190         if (!s->tlsext_ocsp_resp)
2191                 {
2192                 al = SSL_AD_INTERNAL_ERROR;
2193                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2194                 goto f_err;
2195                 }
2196         s->tlsext_ocsp_resplen = resplen;
2197         if (s->ctx->tlsext_status_cb)
2198                 {
2199                 int ret;
2200                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2201                 if (ret == 0)
2202                         {
2203                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2204                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2205                         goto f_err;
2206                         }
2207                 if (ret < 0)
2208                         {
2209                         al = SSL_AD_INTERNAL_ERROR;
2210                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2211                         goto f_err;
2212                         }
2213                 }
2214         return 1;
2215 f_err:
2216         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2217         return(-1);
2218         }
2219 #endif
2220
2221 int ssl3_get_server_done(SSL *s)
2222         {
2223         int ok,ret=0;
2224         long n;
2225
2226         n=s->method->ssl_get_message(s,
2227                 SSL3_ST_CR_SRVR_DONE_A,
2228                 SSL3_ST_CR_SRVR_DONE_B,
2229                 SSL3_MT_SERVER_DONE,
2230                 30, /* should be very small, like 0 :-) */
2231                 &ok);
2232
2233         if (!ok) return((int)n);
2234         if (n > 0)
2235                 {
2236                 /* should contain no data */
2237                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2238                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2239                 return -1;
2240                 }
2241         ret=1;
2242         return(ret);
2243         }
2244
2245
2246 int ssl3_send_client_key_exchange(SSL *s)
2247         {
2248         unsigned char *p,*d;
2249         int n;
2250         unsigned long alg_k;
2251 #ifndef OPENSSL_NO_RSA
2252         unsigned char *q;
2253         EVP_PKEY *pkey=NULL;
2254 #endif
2255 #ifndef OPENSSL_NO_KRB5
2256         KSSL_ERR kssl_err;
2257 #endif /* OPENSSL_NO_KRB5 */
2258 #ifndef OPENSSL_NO_ECDH
2259         EC_KEY *clnt_ecdh = NULL;
2260         const EC_POINT *srvr_ecpoint = NULL;
2261         EVP_PKEY *srvr_pub_pkey = NULL;
2262         unsigned char *encodedPoint = NULL;
2263         int encoded_pt_len = 0;
2264         BN_CTX * bn_ctx = NULL;
2265 #endif
2266
2267         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2268                 {
2269                 d=(unsigned char *)s->init_buf->data;
2270                 p= &(d[4]);
2271
2272                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2273
2274                 /* Fool emacs indentation */
2275                 if (0) {}
2276 #ifndef OPENSSL_NO_RSA
2277                 else if (alg_k & SSL_kRSA)
2278                         {
2279                         RSA *rsa;
2280                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2281
2282                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2283                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2284                         else
2285                                 {
2286                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2287                                 if ((pkey == NULL) ||
2288                                         (pkey->type != EVP_PKEY_RSA) ||
2289                                         (pkey->pkey.rsa == NULL))
2290                                         {
2291                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2292                                         goto err;
2293                                         }
2294                                 rsa=pkey->pkey.rsa;
2295                                 EVP_PKEY_free(pkey);
2296                                 }
2297
2298                         tmp_buf[0]=s->client_version>>8;
2299                         tmp_buf[1]=s->client_version&0xff;
2300                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2301                                         goto err;
2302
2303                         s->session->master_key_length=sizeof tmp_buf;
2304
2305                         q=p;
2306                         /* Fix buf for TLS and beyond */
2307                         if (s->version > SSL3_VERSION)
2308                                 p+=2;
2309                         n=RSA_public_encrypt(sizeof tmp_buf,
2310                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2311 #ifdef PKCS1_CHECK
2312                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2313                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2314 #endif
2315                         if (n <= 0)
2316                                 {
2317                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2318                                 goto err;
2319                                 }
2320
2321                         /* Fix buf for TLS and beyond */
2322                         if (s->version > SSL3_VERSION)
2323                                 {
2324                                 s2n(n,q);
2325                                 n+=2;
2326                                 }
2327
2328                         s->session->master_key_length=
2329                                 s->method->ssl3_enc->generate_master_secret(s,
2330                                         s->session->master_key,
2331                                         tmp_buf,sizeof tmp_buf);
2332                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2333                         }
2334 #endif
2335 #ifndef OPENSSL_NO_KRB5
2336                 else if (alg_k & SSL_kKRB5)
2337                         {
2338                         krb5_error_code krb5rc;
2339                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2340                         /*  krb5_data   krb5_ap_req;  */
2341                         krb5_data       *enc_ticket;
2342                         krb5_data       authenticator, *authp = NULL;
2343                         EVP_CIPHER_CTX  ciph_ctx;
2344                         const EVP_CIPHER *enc = NULL;
2345                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2346                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2347                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2348                                                 + EVP_MAX_IV_LENGTH];
2349                         int             padl, outl = sizeof(epms);
2350
2351                         EVP_CIPHER_CTX_init(&ciph_ctx);
2352
2353 #ifdef KSSL_DEBUG
2354                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2355                                 alg_k, SSL_kKRB5);
2356 #endif  /* KSSL_DEBUG */
2357
2358                         authp = NULL;
2359 #ifdef KRB5SENDAUTH
2360                         if (KRB5SENDAUTH)  authp = &authenticator;
2361 #endif  /* KRB5SENDAUTH */
2362
2363                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2364                                 &kssl_err);
2365                         enc = kssl_map_enc(kssl_ctx->enctype);
2366                         if (enc == NULL)
2367                             goto err;
2368 #ifdef KSSL_DEBUG
2369                         {
2370                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2371                         if (krb5rc && kssl_err.text)
2372                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2373                         }
2374 #endif  /* KSSL_DEBUG */
2375
2376                         if (krb5rc)
2377                                 {
2378                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2379                                                 SSL_AD_HANDSHAKE_FAILURE);
2380                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2381                                                 kssl_err.reason);
2382                                 goto err;
2383                                 }
2384
2385                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2386                         **  in place of RFC 2712 KerberosWrapper, as in:
2387                         **
2388                         **  Send ticket (copy to *p, set n = length)
2389                         **  n = krb5_ap_req.length;
2390                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2391                         **  if (krb5_ap_req.data)
2392                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2393                         **
2394                         **  Now using real RFC 2712 KerberosWrapper
2395                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2396                         **  Note: 2712 "opaque" types are here replaced
2397                         **  with a 2-byte length followed by the value.
2398                         **  Example:
2399                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2400                         **  Where "xx xx" = length bytes.  Shown here with
2401                         **  optional authenticator omitted.
2402                         */
2403
2404                         /*  KerberosWrapper.Ticket              */
2405                         s2n(enc_ticket->length,p);
2406                         memcpy(p, enc_ticket->data, enc_ticket->length);
2407                         p+= enc_ticket->length;
2408                         n = enc_ticket->length + 2;
2409
2410                         /*  KerberosWrapper.Authenticator       */
2411                         if (authp  &&  authp->length)
2412                                 {
2413                                 s2n(authp->length,p);
2414                                 memcpy(p, authp->data, authp->length);
2415                                 p+= authp->length;
2416                                 n+= authp->length + 2;
2417
2418                                 free(authp->data);
2419                                 authp->data = NULL;
2420                                 authp->length = 0;
2421                                 }
2422                         else
2423                                 {
2424                                 s2n(0,p);/*  null authenticator length  */
2425                                 n+=2;
2426                                 }
2427
2428                             tmp_buf[0]=s->client_version>>8;
2429                             tmp_buf[1]=s->client_version&0xff;
2430                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2431                                 goto err;
2432
2433                         /*  20010420 VRS.  Tried it this way; failed.
2434                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2435                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2436                         **                              kssl_ctx->length);
2437                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2438                         */
2439
2440                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2441                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2442                                 kssl_ctx->key,iv);
2443                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2444                                 sizeof tmp_buf);
2445                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2446                         outl += padl;
2447                         if (outl > (int)sizeof epms)
2448                                 {
2449                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2450                                 goto err;
2451                                 }
2452                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2453
2454                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2455                         s2n(outl,p);
2456                         memcpy(p, epms, outl);
2457                         p+=outl;
2458                         n+=outl + 2;
2459
2460                         s->session->master_key_length=
2461                                 s->method->ssl3_enc->generate_master_secret(s,
2462                                         s->session->master_key,
2463                                         tmp_buf, sizeof tmp_buf);
2464
2465                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2466                         OPENSSL_cleanse(epms, outl);
2467                         }
2468 #endif
2469 #ifndef OPENSSL_NO_DH
2470                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2471                         {
2472                         DH *dh_srvr,*dh_clnt;
2473                         SESS_CERT *scert = s->session->sess_cert;
2474
2475                         if (scert == NULL)
2476                                 {
2477                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2478                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2479                                 goto err;
2480                                 }
2481
2482                         if (scert->peer_dh_tmp != NULL)
2483                                 dh_srvr=scert->peer_dh_tmp;
2484                         else
2485                                 {
2486                                 /* we get them from the cert */
2487                                 int idx = scert->peer_cert_type;
2488                                 EVP_PKEY *spkey = NULL;
2489                                 dh_srvr = NULL;
2490                                 if (idx >= 0)
2491                                         spkey = X509_get_pubkey(
2492                                                 scert->peer_pkeys[idx].x509);
2493                                 if (spkey)
2494                                         {
2495                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2496                                         EVP_PKEY_free(spkey);
2497                                         }
2498                                 if (dh_srvr == NULL)
2499                                         {
2500                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2501                                             ERR_R_INTERNAL_ERROR);
2502                                         goto err;
2503                                         }
2504                                 }
2505                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2506                                 {
2507                                 /* Use client certificate key */
2508                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2509                                 dh_clnt = NULL;
2510                                 if (clkey)
2511                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2512                                 if (dh_clnt == NULL)
2513                                         {
2514                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2515                                             ERR_R_INTERNAL_ERROR);
2516                                         goto err;
2517                                         }
2518                                 }
2519                         else
2520                                 {
2521                                 /* generate a new random key */
2522                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2523                                         {
2524                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2525                                         goto err;
2526                                         }
2527                                 if (!DH_generate_key(dh_clnt))
2528                                         {
2529                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2530                                         DH_free(dh_clnt);
2531                                         goto err;
2532                                         }
2533                                 }
2534
2535                         /* use the 'p' output buffer for the DH key, but
2536                          * make sure to clear it out afterwards */
2537
2538                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2539                         if (scert->peer_dh_tmp == NULL)
2540                                 DH_free(dh_srvr);
2541
2542                         if (n <= 0)
2543                                 {
2544                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2545                                 DH_free(dh_clnt);
2546                                 goto err;
2547                                 }
2548
2549                         /* generate master key from the result */
2550                         s->session->master_key_length=
2551                                 s->method->ssl3_enc->generate_master_secret(s,
2552                                         s->session->master_key,p,n);
2553                         /* clean up */
2554                         memset(p,0,n);
2555
2556                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2557                                 n = 0;
2558                         else
2559                                 {
2560                                 /* send off the data */
2561                                 n=BN_num_bytes(dh_clnt->pub_key);
2562                                 s2n(n,p);
2563                                 BN_bn2bin(dh_clnt->pub_key,p);
2564                                 n+=2;
2565                                 }
2566
2567                         DH_free(dh_clnt);
2568
2569                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2570                         }
2571 #endif
2572
2573 #ifndef OPENSSL_NO_ECDH
2574                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2575                         {
2576                         const EC_GROUP *srvr_group = NULL;
2577                         EC_KEY *tkey;
2578                         int ecdh_clnt_cert = 0;
2579                         int field_size = 0;
2580
2581                         /* Did we send out the client's
2582                          * ECDH share for use in premaster
2583                          * computation as part of client certificate?
2584                          * If so, set ecdh_clnt_cert to 1.
2585                          */
2586                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2587                                 {
2588                                 /* XXX: For now, we do not support client
2589                                  * authentication using ECDH certificates.
2590                                  * To add such support, one needs to add
2591                                  * code that checks for appropriate
2592                                  * conditions and sets ecdh_clnt_cert to 1.
2593                                  * For example, the cert have an ECC
2594                                  * key on the same curve as the server's
2595                                  * and the key should be authorized for
2596                                  * key agreement.
2597                                  *
2598                                  * One also needs to add code in ssl3_connect
2599                                  * to skip sending the certificate verify
2600                                  * message.
2601                                  *
2602                                  * if ((s->cert->key->privatekey != NULL) &&
2603                                  *     (s->cert->key->privatekey->type ==
2604                                  *      EVP_PKEY_EC) && ...)
2605                                  * ecdh_clnt_cert = 1;
2606                                  */
2607                                 }
2608
2609                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2610                                 {
2611                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2612                                 }
2613                         else
2614                                 {
2615                                 /* Get the Server Public Key from Cert */
2616                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2617                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2618                                 if ((srvr_pub_pkey == NULL) ||
2619                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2620                                     (srvr_pub_pkey->pkey.ec == NULL))
2621                                         {
2622                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2623                                             ERR_R_INTERNAL_ERROR);
2624                                         goto err;
2625                                         }
2626
2627                                 tkey = srvr_pub_pkey->pkey.ec;
2628                                 }
2629
2630                         srvr_group   = EC_KEY_get0_group(tkey);
2631                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2632
2633                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2634                                 {
2635                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2636                                     ERR_R_INTERNAL_ERROR);
2637                                 goto err;
2638                                 }
2639
2640                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2641                                 {
2642                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2643                                 goto err;
2644                                 }
2645
2646                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2647                                 {
2648                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2649                                 goto err;
2650                                 }
2651                         if (ecdh_clnt_cert)
2652                                 {
2653                                 /* Reuse key info from our certificate
2654                                  * We only need our private key to perform
2655                                  * the ECDH computation.
2656                                  */
2657                                 const BIGNUM *priv_key;
2658                                 tkey = s->cert->key->privatekey->pkey.ec;
2659                                 priv_key = EC_KEY_get0_private_key(tkey);
2660                                 if (priv_key == NULL)
2661                                         {
2662                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2663                                         goto err;
2664                                         }
2665                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2666                                         {
2667                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2668                                         goto err;
2669                                         }
2670                                 }
2671                         else
2672                                 {
2673                                 /* Generate a new ECDH key pair */
2674                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2675                                         {
2676                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2677                                         goto err;
2678                                         }
2679                                 }
2680
2681                         /* use the 'p' output buffer for the ECDH key, but
2682                          * make sure to clear it out afterwards
2683                          */
2684
2685                         field_size = EC_GROUP_get_degree(srvr_group);
2686                         if (field_size <= 0)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2689                                        ERR_R_ECDH_LIB);
2690                                 goto err;
2691                                 }
2692                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2693                         if (n <= 0)
2694                                 {
2695                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2696                                        ERR_R_ECDH_LIB);
2697                                 goto err;
2698                                 }
2699
2700                         /* generate master key from the result */
2701                         s->session->master_key_length = s->method->ssl3_enc \
2702                             -> generate_master_secret(s,
2703                                 s->session->master_key,
2704                                 p, n);
2705
2706                         memset(p, 0, n); /* clean up */
2707
2708                         if (ecdh_clnt_cert)
2709                                 {
2710                                 /* Send empty client key exch message */
2711                                 n = 0;
2712                                 }
2713                         else
2714                                 {
2715                                 /* First check the size of encoding and
2716                                  * allocate memory accordingly.
2717                                  */
2718                                 encoded_pt_len =
2719                                     EC_POINT_point2oct(srvr_group,
2720                                         EC_KEY_get0_public_key(clnt_ecdh),
2721                                         POINT_CONVERSION_UNCOMPRESSED,
2722                                         NULL, 0, NULL);
2723
2724                                 encodedPoint = (unsigned char *)
2725                                     OPENSSL_malloc(encoded_pt_len *
2726                                         sizeof(unsigned char));
2727                                 bn_ctx = BN_CTX_new();
2728                                 if ((encodedPoint == NULL) ||
2729                                     (bn_ctx == NULL))
2730                                         {
2731                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2732                                         goto err;
2733                                         }
2734
2735                                 /* Encode the public key */
2736                                 n = EC_POINT_point2oct(srvr_group,
2737                                     EC_KEY_get0_public_key(clnt_ecdh),
2738                                     POINT_CONVERSION_UNCOMPRESSED,
2739                                     encodedPoint, encoded_pt_len, bn_ctx);
2740
2741                                 *p = n; /* length of encoded point */
2742                                 /* Encoded point will be copied here */
2743                                 p += 1;
2744                                 /* copy the point */
2745                                 memcpy((unsigned char *)p, encodedPoint, n);
2746                                 /* increment n to account for length field */
2747                                 n += 1;
2748                                 }
2749
2750                         /* Free allocated memory */
2751                         BN_CTX_free(bn_ctx);
2752                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2753                         if (clnt_ecdh != NULL)
2754                                  EC_KEY_free(clnt_ecdh);
2755                         EVP_PKEY_free(srvr_pub_pkey);
2756                         }
2757 #endif /* !OPENSSL_NO_ECDH */
2758                 else if (alg_k & SSL_kGOST)
2759                         {
2760                         /* GOST key exchange message creation */
2761                         EVP_PKEY_CTX *pkey_ctx;
2762                         X509 *peer_cert;
2763                         size_t msglen;
2764                         unsigned int md_len;
2765                         int keytype;
2766                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2767                         EVP_MD_CTX *ukm_hash;
2768                         EVP_PKEY *pub_key;
2769
2770                         /* Get server sertificate PKEY and create ctx from it */
2771                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2772                         if (!peer_cert)
2773                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2774                         if (!peer_cert)         {
2775                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2776                                         goto err;
2777                                 }
2778
2779                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2780                         /* If we have send a certificate, and certificate key
2781
2782                          * parameters match those of server certificate, use
2783                          * certificate key for key exchange
2784                          */
2785
2786                          /* Otherwise, generate ephemeral key pair */
2787
2788                         EVP_PKEY_encrypt_init(pkey_ctx);
2789                           /* Generate session key */
2790                     RAND_bytes(premaster_secret,32);
2791                         /* If we have client certificate, use its secret as peer key */
2792                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2793                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2794                                         /* If there was an error - just ignore it. Ephemeral key
2795                                         * would be used
2796                                         */
2797                                         ERR_clear_error();
2798                                 }
2799                         }
2800                         /* Compute shared IV and store it in algorithm-specific
2801                          * context data */
2802                         ukm_hash = EVP_MD_CTX_create();
2803                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2804                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2805                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2806                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2807                         EVP_MD_CTX_destroy(ukm_hash);
2808                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2809                                 8,shared_ukm)<0) {
2810                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2811                                                 SSL_R_LIBRARY_BUG);
2812                                         goto err;
2813                                 }
2814                         /* Make GOST keytransport blob message */
2815                         /*Encapsulate it into sequence */
2816                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2817                         msglen=255;
2818                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2819                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2820                                         SSL_R_LIBRARY_BUG);
2821                                 goto err;
2822                         }
2823                         if (msglen >= 0x80)
2824                                 {
2825                                 *(p++)=0x81;
2826                                 *(p++)= msglen & 0xff;
2827                                 n=msglen+3;
2828                                 }
2829                         else
2830                                 {
2831                                 *(p++)= msglen & 0xff;
2832                                 n=msglen+2;
2833                                 }
2834                         memcpy(p, tmp, msglen);
2835                         /* Check if pubkey from client certificate was used */
2836                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2837                                 {
2838                                 /* Set flag "skip certificate verify" */
2839                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2840                                 }
2841                         EVP_PKEY_CTX_free(pkey_ctx);
2842                         s->session->master_key_length=
2843                                 s->method->ssl3_enc->generate_master_secret(s,
2844                                         s->session->master_key,premaster_secret,32);
2845                         EVP_PKEY_free(pub_key);
2846
2847                         }
2848 #ifndef OPENSSL_NO_SRP
2849                 else if (alg_k & SSL_kSRP)
2850                         {
2851                         if (s->srp_ctx.A != NULL)
2852                                 {
2853                                 /* send off the data */
2854                                 n=BN_num_bytes(s->srp_ctx.A);
2855                                 s2n(n,p);
2856                                 BN_bn2bin(s->srp_ctx.A,p);
2857                                 n+=2;
2858                                 }
2859                         else
2860                                 {
2861                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2862                                 goto err;
2863                                 }
2864                         if (s->session->srp_username != NULL)
2865                                 OPENSSL_free(s->session->srp_username);
2866                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2867                         if (s->session->srp_username == NULL)
2868                                 {
2869                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2870                                         ERR_R_MALLOC_FAILURE);
2871                                 goto err;
2872                                 }
2873
2874                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2875                                 {
2876                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2877                                 goto err;
2878                                 }
2879                         }
2880 #endif
2881 #ifndef OPENSSL_NO_PSK
2882                 else if (alg_k & SSL_kPSK)
2883                         {
2884                         char identity[PSK_MAX_IDENTITY_LEN];
2885                         unsigned char *t = NULL;
2886                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2887                         unsigned int pre_ms_len = 0, psk_len = 0;
2888                         int psk_err = 1;
2889
2890                         n = 0;
2891                         if (s->psk_client_callback == NULL)
2892                                 {
2893                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2894                                         SSL_R_PSK_NO_CLIENT_CB);
2895                                 goto err;
2896                                 }
2897
2898                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2899                                 identity, PSK_MAX_IDENTITY_LEN,
2900                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2901                         if (psk_len > PSK_MAX_PSK_LEN)
2902                                 {
2903                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2904                                         ERR_R_INTERNAL_ERROR);
2905                                 goto psk_err;
2906                                 }
2907                         else if (psk_len == 0)
2908                                 {
2909                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2910                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2911                                 goto psk_err;
2912                                 }
2913
2914                         /* create PSK pre_master_secret */
2915                         pre_ms_len = 2+psk_len+2+psk_len;
2916                         t = psk_or_pre_ms;
2917                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2918                         s2n(psk_len, t);
2919                         memset(t, 0, psk_len);
2920                         t+=psk_len;
2921                         s2n(psk_len, t);
2922
2923                         if (s->session->psk_identity_hint != NULL)
2924                                 OPENSSL_free(s->session->psk_identity_hint);
2925                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2926                         if (s->ctx->psk_identity_hint != NULL &&
2927                                 s->session->psk_identity_hint == NULL)
2928                                 {
2929                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2930                                         ERR_R_MALLOC_FAILURE);
2931                                 goto psk_err;
2932                                 }
2933
2934                         if (s->session->psk_identity != NULL)
2935                                 OPENSSL_free(s->session->psk_identity);
2936                         s->session->psk_identity = BUF_strdup(identity);
2937                         if (s->session->psk_identity == NULL)
2938                                 {
2939                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2940                                         ERR_R_MALLOC_FAILURE);
2941                                 goto psk_err;
2942                                 }
2943
2944                         s->session->master_key_length =
2945                                 s->method->ssl3_enc->generate_master_secret(s,
2946                                         s->session->master_key,
2947                                         psk_or_pre_ms, pre_ms_len);
2948                         n = strlen(identity);
2949                         s2n(n, p);
2950                         memcpy(p, identity, n);
2951                         n+=2;
2952                         psk_err = 0;
2953                 psk_err:
2954                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2955                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2956                         if (psk_err != 0)
2957                                 {
2958                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2959                                 goto err;
2960                                 }
2961                         }
2962 #endif
2963                 else
2964                         {
2965                         ssl3_send_alert(s, SSL3_AL_FATAL,
2966                             SSL_AD_HANDSHAKE_FAILURE);
2967                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2968                             ERR_R_INTERNAL_ERROR);
2969                         goto err;
2970                         }
2971
2972                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2973                 l2n3(n,d);
2974
2975                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2976                 /* number of bytes to write */
2977                 s->init_num=n+4;
2978                 s->init_off=0;
2979                 }
2980
2981         /* SSL3_ST_CW_KEY_EXCH_B */
2982         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2983 err:
2984 #ifndef OPENSSL_NO_ECDH
2985         BN_CTX_free(bn_ctx);
2986         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2987         if (clnt_ecdh != NULL)
2988                 EC_KEY_free(clnt_ecdh);
2989         EVP_PKEY_free(srvr_pub_pkey);
2990 #endif
2991         return(-1);
2992         }
2993
2994 int ssl3_send_client_verify(SSL *s)
2995         {
2996         unsigned char *p,*d;
2997         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2998         EVP_PKEY *pkey;
2999         EVP_PKEY_CTX *pctx=NULL;
3000         EVP_MD_CTX mctx;
3001         unsigned u=0;
3002         unsigned long n;
3003         int j;
3004
3005         EVP_MD_CTX_init(&mctx);
3006
3007         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3008                 {
3009                 d=(unsigned char *)s->init_buf->data;
3010                 p= &(d[4]);
3011                 pkey=s->cert->key->privatekey;
3012 /* Create context from key and test if sha1 is allowed as digest */
3013                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3014                 EVP_PKEY_sign_init(pctx);
3015                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3016                         {
3017                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3018                                 s->method->ssl3_enc->cert_verify_mac(s,
3019                                                 NID_sha1,
3020                                                 &(data[MD5_DIGEST_LENGTH]));
3021                         }
3022                 else
3023                         {
3024                         ERR_clear_error();
3025                         }
3026                 /* For TLS v1.2 send signature algorithm and signature
3027                  * using agreed digest and cached handshake records.
3028                  */
3029                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3030                         {
3031                         long hdatalen = 0;
3032                         void *hdata;
3033                         const EVP_MD *md = s->cert->key->digest;
3034                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3035                                                                 &hdata);
3036                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3037                                 {
3038                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3039                                                 ERR_R_INTERNAL_ERROR);
3040                                 goto err;
3041                                 }
3042                         p += 2;
3043 #ifdef SSL_DEBUG
3044                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3045                                                         EVP_MD_name(md));
3046 #endif
3047                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3048                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3049                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3050                                 {
3051                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3052                                                 ERR_R_EVP_LIB);
3053                                 goto err;
3054                                 }
3055                         s2n(u,p);
3056                         n = u + 4;
3057                         if (!ssl3_digest_cached_records(s))
3058                                 goto err;
3059                         }
3060                 else
3061 #ifndef OPENSSL_NO_RSA
3062                 if (pkey->type == EVP_PKEY_RSA)
3063                         {
3064                         s->method->ssl3_enc->cert_verify_mac(s,
3065                                 NID_md5,
3066                                 &(data[0]));
3067                         if (RSA_sign(NID_md5_sha1, data,
3068                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3069                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3070                                 {
3071                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3072                                 goto err;
3073                                 }
3074                         s2n(u,p);
3075                         n=u+2;
3076                         }
3077                 else
3078 #endif
3079 #ifndef OPENSSL_NO_DSA
3080                         if (pkey->type == EVP_PKEY_DSA)
3081                         {
3082                         if (!DSA_sign(pkey->save_type,
3083                                 &(data[MD5_DIGEST_LENGTH]),
3084                                 SHA_DIGEST_LENGTH,&(p[2]),
3085                                 (unsigned int *)&j,pkey->pkey.dsa))
3086                                 {
3087                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3088                                 goto err;
3089                                 }
3090                         s2n(j,p);
3091                         n=j+2;
3092                         }
3093                 else
3094 #endif
3095 #ifndef OPENSSL_NO_ECDSA
3096                         if (pkey->type == EVP_PKEY_EC)
3097                         {
3098                         if (!ECDSA_sign(pkey->save_type,
3099                                 &(data[MD5_DIGEST_LENGTH]),
3100                                 SHA_DIGEST_LENGTH,&(p[2]),
3101                                 (unsigned int *)&j,pkey->pkey.ec))
3102                                 {
3103                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3104                                     ERR_R_ECDSA_LIB);
3105                                 goto err;
3106                                 }
3107                         s2n(j,p);
3108                         n=j+2;
3109                         }
3110                 else
3111 #endif
3112                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3113                 {
3114                 unsigned char signbuf[64];
3115                 int i;
3116                 size_t sigsize=64;
3117                 s->method->ssl3_enc->cert_verify_mac(s,
3118                         NID_id_GostR3411_94,
3119                         data);
3120                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3121                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3122                         ERR_R_INTERNAL_ERROR);
3123                         goto err;
3124                 }
3125                 for (i=63,j=0; i>=0; j++, i--) {
3126                         p[2+j]=signbuf[i];
3127                 }
3128                 s2n(j,p);
3129                 n=j+2;
3130                 }
3131                 else
3132                 {
3133                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3134                         goto err;
3135                 }
3136                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3137                 l2n3(n,d);
3138
3139                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3140                 s->init_num=(int)n+4;
3141                 s->init_off=0;
3142                 }
3143         EVP_MD_CTX_cleanup(&mctx);
3144         EVP_PKEY_CTX_free(pctx);
3145         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3146 err:
3147         EVP_MD_CTX_cleanup(&mctx);
3148         EVP_PKEY_CTX_free(pctx);
3149         return(-1);
3150         }
3151
3152 /* Check a certificate can be used for client authentication. Currently
3153  * just check cert exists and if static DH client certificates can be used.
3154  */
3155 static int ssl3_check_client_certificate(SSL *s)
3156         {
3157         unsigned long alg_k;
3158         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3159                 return 0;
3160         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3161         /* See if we can use client certificate for fixed DH */
3162         if (alg_k & (SSL_kDHr|SSL_kDHd))
3163                 {
3164                 SESS_CERT *scert = s->session->sess_cert;
3165                 int i = scert->peer_cert_type;
3166                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3167                 clkey = s->cert->key->privatekey;
3168                 /* If client key not DH assume it can be used */
3169                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3170                         return 1;
3171                 if (i >= 0)
3172                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3173                 if (spkey)
3174                         {
3175                         /* Compare server and client parameters */
3176                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3177                         EVP_PKEY_free(spkey);
3178                         if (i != 1)
3179                                 return 0;
3180                         }
3181                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3182                 }
3183         return 1;
3184         }
3185
3186 int ssl3_send_client_certificate(SSL *s)
3187         {
3188         X509 *x509=NULL;
3189         EVP_PKEY *pkey=NULL;
3190         int i;
3191         unsigned long l;
3192
3193         if (s->state == SSL3_ST_CW_CERT_A)
3194                 {
3195                 /* Let cert callback update client certificates if required */
3196                 if (s->cert->cert_cb
3197                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3198                         {
3199                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3200                         return 0;
3201                         }
3202                 if (ssl3_check_client_certificate(s))
3203                         s->state=SSL3_ST_CW_CERT_C;
3204                 else
3205                         s->state=SSL3_ST_CW_CERT_B;
3206                 }
3207
3208         /* We need to get a client cert */
3209         if (s->state == SSL3_ST_CW_CERT_B)
3210                 {
3211                 /* If we get an error, we need to
3212                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3213                  * We then get retied later */
3214                 i=0;
3215                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3216                 if (i < 0)
3217                         {
3218                         s->rwstate=SSL_X509_LOOKUP;
3219                         return(-1);
3220                         }
3221                 s->rwstate=SSL_NOTHING;
3222                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3223                         {
3224                         s->state=SSL3_ST_CW_CERT_B;
3225                         if (    !SSL_use_certificate(s,x509) ||
3226                                 !SSL_use_PrivateKey(s,pkey))
3227                                 i=0;
3228                         }
3229                 else if (i == 1)
3230                         {
3231                         i=0;
3232                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3233                         }
3234
3235                 if (x509 != NULL) X509_free(x509);
3236                 if (pkey != NULL) EVP_PKEY_free(pkey);
3237                 if (i && !ssl3_check_client_certificate(s))
3238                         i = 0;
3239                 if (i == 0)
3240                         {
3241                         if (s->version == SSL3_VERSION)
3242                                 {
3243                                 s->s3->tmp.cert_req=0;
3244                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3245                                 return(1);
3246                                 }
3247                         else
3248                                 {
3249                                 s->s3->tmp.cert_req=2;
3250                                 }
3251                         }
3252
3253                 /* Ok, we have a cert */
3254                 s->state=SSL3_ST_CW_CERT_C;
3255                 }
3256
3257         if (s->state == SSL3_ST_CW_CERT_C)
3258                 {
3259                 s->state=SSL3_ST_CW_CERT_D;
3260                 l=ssl3_output_cert_chain(s,
3261                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3262                 s->init_num=(int)l;
3263                 s->init_off=0;
3264                 }
3265         /* SSL3_ST_CW_CERT_D */
3266         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3267         }
3268
3269 #define has_bits(i,m)   (((i)&(m)) == (m))
3270
3271 int ssl3_check_cert_and_algorithm(SSL *s)
3272         {
3273         int i,idx;
3274         long alg_k,alg_a;
3275         EVP_PKEY *pkey=NULL;
3276         SESS_CERT *sc;
3277 #ifndef OPENSSL_NO_RSA
3278         RSA *rsa;
3279 #endif
3280 #ifndef OPENSSL_NO_DH
3281         DH *dh;
3282 #endif
3283
3284         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3285         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3286
3287         /* we don't have a certificate */
3288         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3289                 return(1);
3290
3291         sc=s->session->sess_cert;
3292         if (sc == NULL)
3293                 {
3294                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3295                 goto err;
3296                 }
3297
3298 #ifndef OPENSSL_NO_RSA
3299         rsa=s->session->sess_cert->peer_rsa_tmp;
3300 #endif
3301 #ifndef OPENSSL_NO_DH
3302         dh=s->session->sess_cert->peer_dh_tmp;
3303 #endif
3304
3305         /* This is the passed certificate */
3306
3307         idx=sc->peer_cert_type;
3308 #ifndef OPENSSL_NO_ECDH
3309         if (idx == SSL_PKEY_ECC)
3310                 {
3311                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3312                                                                 s) == 0)
3313                         { /* check failed */
3314                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3315                         goto f_err;
3316                         }
3317                 else
3318                         {
3319                         return 1;
3320                         }
3321                 }
3322 #endif
3323         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3324         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3325         EVP_PKEY_free(pkey);
3326
3327
3328         /* Check that we have a certificate if we require one */
3329         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3330                 {
3331                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3332                 goto f_err;
3333                 }
3334 #ifndef OPENSSL_NO_DSA
3335         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3336                 {
3337                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3338                 goto f_err;
3339                 }
3340 #endif
3341 #ifndef OPENSSL_NO_RSA
3342         if ((alg_k & SSL_kRSA) &&
3343                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3344                 {
3345                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3346                 goto f_err;
3347                 }
3348 #endif
3349 #ifndef OPENSSL_NO_DH
3350         if ((alg_k & SSL_kEDH) &&
3351                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3352                 {
3353                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3354                 goto f_err;
3355                 }
3356         else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3357                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3358                 {
3359                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3360                 goto f_err;
3361                 }
3362 #ifndef OPENSSL_NO_DSA
3363         else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3364                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3365                 {
3366                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3367                 goto f_err;
3368                 }
3369 #endif
3370 #endif
3371
3372         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3373                 {
3374 #ifndef OPENSSL_NO_RSA
3375                 if (alg_k & SSL_kRSA)
3376                         {
3377                         if (rsa == NULL
3378                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3379                                 {
3380                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3381                                 goto f_err;
3382                                 }
3383                         }
3384                 else
3385 #endif
3386 #ifndef OPENSSL_NO_DH
3387                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3388                             {
3389                             if (dh == NULL
3390                                 || DH_size(dh)*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_DH_KEY);
3393                                 goto f_err;
3394                                 }
3395                         }
3396                 else
3397 #endif
3398                         {
3399                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3400                         goto f_err;
3401                         }
3402                 }
3403         return(1);
3404 f_err:
3405         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3406 err:
3407         return(0);
3408         }
3409
3410 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3411 int ssl3_send_next_proto(SSL *s)
3412         {
3413         unsigned int len, padding_len;
3414         unsigned char *d;
3415
3416         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3417                 {
3418                 len = s->next_proto_negotiated_len;
3419                 padding_len = 32 - ((len + 2) % 32);
3420                 d = (unsigned char *)s->init_buf->data;
3421                 d[4] = len;
3422                 memcpy(d + 5, s->next_proto_negotiated, len);
3423                 d[5 + len] = padding_len;
3424                 memset(d + 6 + len, 0, padding_len);
3425                 *(d++)=SSL3_MT_NEXT_PROTO;
3426                 l2n3(2 + len + padding_len, d);
3427                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3428                 s->init_num = 4 + 2 + len + padding_len;
3429                 s->init_off = 0;
3430                 }
3431
3432         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3433 }
3434 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3435
3436 /* Check to see if handshake is full or resumed. Usually this is just a
3437  * case of checking to see if a cache hit has occurred. In the case of
3438  * session tickets we have to check the next message to be sure.
3439  */
3440
3441 #ifndef OPENSSL_NO_TLSEXT
3442 int ssl3_check_finished(SSL *s)
3443         {
3444         int ok;
3445         long n;
3446         /* If we have no ticket it cannot be a resumed session. */
3447         if (!s->session->tlsext_tick)
3448                 return 1;
3449         /* this function is called when we really expect a Certificate
3450          * message, so permit appropriate message length */
3451         n=s->method->ssl_get_message(s,
3452                 SSL3_ST_CR_CERT_A,
3453                 SSL3_ST_CR_CERT_B,
3454                 -1,
3455                 s->max_cert_list,
3456                 &ok);
3457         if (!ok) return((int)n);
3458         s->s3->tmp.reuse_message = 1;
3459         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3460                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3461                 return 2;
3462
3463         return 1;
3464         }
3465 #endif
3466
3467 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3468         {
3469         int i = 0;
3470 #ifndef OPENSSL_NO_ENGINE
3471         if (s->ctx->client_cert_engine)
3472                 {
3473                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3474                                                 SSL_get_client_CA_list(s),
3475                                                 px509, ppkey, NULL, NULL, NULL);
3476                 if (i != 0)
3477                         return i;
3478                 }
3479 #endif
3480         if (s->ctx->client_cert_cb)
3481                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3482         return i;
3483         }
3484
3485 #ifndef OPENSSL_NO_TLSEXT
3486 int tls1_get_server_supplemental_data(SSL *s)
3487         {
3488         int al;
3489         int ok;
3490         unsigned long supp_data_len, authz_data_len;
3491         long n;
3492         unsigned short supp_data_type, authz_data_type, proof_len;
3493         const unsigned char *p;
3494         unsigned char *new_proof;
3495
3496         n=s->method->ssl_get_message(s,
3497                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3498                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3499                 SSL3_MT_SUPPLEMENTAL_DATA,
3500                 /* use default limit */
3501                 TLSEXT_MAXLEN_supplemental_data,
3502                 &ok);
3503
3504         if (!ok) return((int)n);
3505
3506         p = (unsigned char *)s->init_msg;
3507
3508         /* The message cannot be empty */
3509         if (n < 3)
3510                 {
3511                 al = SSL_AD_DECODE_ERROR;
3512                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3513                 goto f_err;
3514                 }
3515         /* Length of supplemental data */
3516         n2l3(p,supp_data_len);
3517         n -= 3;
3518         /* We must have at least one supplemental data entry
3519          * with type (1 byte) and length (2 bytes). */
3520         if (supp_data_len != (unsigned long) n || n < 4)
3521                 {
3522                 al = SSL_AD_DECODE_ERROR;
3523                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3524                 goto f_err;
3525                 }
3526         /* Supplemental data type: must be authz_data */
3527         n2s(p,supp_data_type);
3528         n -= 2;
3529         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3530                 {
3531                 al = SSL_AD_UNEXPECTED_MESSAGE;
3532                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3533                 goto f_err;
3534                 }
3535         /* Authz data length */
3536         n2s(p, authz_data_len);
3537         n -= 2;
3538         if (authz_data_len != (unsigned long) n || n < 1)
3539                 {
3540                 al = SSL_AD_DECODE_ERROR;
3541                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3542                 goto f_err;
3543                 }
3544         /* Authz data type: must be audit_proof */
3545         authz_data_type = *(p++);
3546         n -= 1;
3547         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3548                 {
3549                 al=SSL_AD_UNEXPECTED_MESSAGE;
3550                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3551                 goto f_err;
3552                 }
3553         /* We have a proof: read its length */
3554         if (n < 2)
3555                 {
3556                 al = SSL_AD_DECODE_ERROR;
3557                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3558                 goto f_err;
3559                 }
3560         n2s(p, proof_len);
3561         n -= 2;
3562         if (proof_len != (unsigned long) n)
3563                 {
3564                 al = SSL_AD_DECODE_ERROR;
3565                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3566                 goto f_err;
3567                 }
3568         /* Store the proof */
3569         new_proof = OPENSSL_realloc(s->session->audit_proof,
3570                                     proof_len);
3571         if (new_proof == NULL)
3572                 {
3573                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3574                 return 0;
3575                 }
3576         s->session->audit_proof_length = proof_len;
3577         s->session->audit_proof = new_proof;
3578         memcpy(s->session->audit_proof, p, proof_len);
3579
3580         /* Got the proof, but can't verify it yet. */
3581         return 1;
3582 f_err:
3583         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3584         return -1;
3585         }
3586 #endif