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 int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 171
 172 #ifndef OPENSSL_NO_SSL3_METHOD
 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 #endif
 186
 187 int ssl3_connect(SSL *s)
 188         {
 189         BUF_MEM *buf=NULL;
 190         unsigned long Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         s->in_handshake++;
 205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 206
 207 #ifndef OPENSSL_NO_HEARTBEATS
 208         /* If we're awaiting a HeartbeatResponse, pretend we
 209          * already got and don't await it anymore, because
 210          * Heartbeats don't make sense during handshakes anyway.
 211          */
 212         if (s->tlsext_hb_pending)
 213                 {
 214                 s->tlsext_hb_pending = 0;
 215                 s->tlsext_hb_seq++;
 216                 }
 217 #endif
 218
 219         for (;;)
 220                 {
 221                 state=s->state;
 222
 223                 switch(s->state)
 224                         {
 225                 case SSL_ST_RENEGOTIATE:
 226                         s->renegotiate=1;
 227                         s->state=SSL_ST_CONNECT;
 228                         s->ctx->stats.sess_connect_renegotiate++;
 229                         /* break */
 230                 case SSL_ST_BEFORE:
 231                 case SSL_ST_CONNECT:
 232                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 233                 case SSL_ST_OK|SSL_ST_CONNECT:
 234
 235                         s->server=0;
 236                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 237
 238                         if ((s->version & 0xff00 ) != 0x0300)
 239                                 {
 240                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 241                                 ret = -1;
 242                                 goto end;
 243                                 }
 244
 245                         /* s->version=SSL3_VERSION; */
 246                         s->type=SSL_ST_CONNECT;
 247
 248                         if (s->init_buf == NULL)
 249                                 {
 250                                 if ((buf=BUF_MEM_new()) == NULL)
 251                                         {
 252                                         ret= -1;
 253                                         goto end;
 254                                         }
 255                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 256                                         {
 257                                         ret= -1;
 258                                         goto end;
 259                                         }
 260                                 s->init_buf=buf;
 261                                 buf=NULL;
 262                                 }
 263
 264                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 265
 266                         /* setup buffing BIO */
 267                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 268
 269                         /* don't push the buffering BIO quite yet */
 270
 271                         ssl3_init_finished_mac(s);
 272
 273                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 274                         s->ctx->stats.sess_connect++;
 275                         s->init_num=0;
 276                         break;
 277
 278                 case SSL3_ST_CW_CLNT_HELLO_A:
 279                 case SSL3_ST_CW_CLNT_HELLO_B:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 285                         s->init_num=0;
 286
 287                         /* turn on buffering for the next lot of output */
 288                         if (s->bbio != s->wbio)
 289                                 s->wbio=BIO_push(s->bbio,s->wbio);
 290
 291                         break;
 292
 293                 case SSL3_ST_CR_SRVR_HELLO_A:
 294                 case SSL3_ST_CR_SRVR_HELLO_B:
 295                         ret=ssl3_get_server_hello(s);
 296                         if (ret <= 0) goto end;
 297
 298                         if (s->hit)
 299                                 {
 300                                 s->state=SSL3_ST_CR_FINISHED_A;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_ticket_expected)
 303                                         {
 304                                         /* receive renewed session ticket */
 305                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 306                                         }
 307 #endif
 308                                 }
 309                         else
 310                                 {
 311                                         s->state=SSL3_ST_CR_CERT_A;
 312                                 }
 313                         s->init_num=0;
 314                         break;
 315                 case SSL3_ST_CR_CERT_A:
 316                 case SSL3_ST_CR_CERT_B:
 317 #ifndef OPENSSL_NO_TLSEXT
 318                         ret=ssl3_check_finished(s);
 319                         if (ret <= 0) goto end;
 320                         if (ret == 2)
 321                                 {
 322                                 s->hit = 1;
 323                                 if (s->tlsext_ticket_expected)
 324                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 325                                 else
 326                                         s->state=SSL3_ST_CR_FINISHED_A;
 327                                 s->init_num=0;
 328                                 break;
 329                                 }
 330 #endif
 331                         /* Check if it is anon DH/ECDH, SRP auth */
 332                         /* or PSK */
 333                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 334                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 335                                 {
 336                                 ret=ssl3_get_server_certificate(s);
 337                                 if (ret <= 0) goto end;
 338 #ifndef OPENSSL_NO_TLSEXT
 339                                 if (s->tlsext_status_expected)
 340                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 341                                 else
 342                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 343                                 }
 344                         else
 345                                 {
 346                                 skip = 1;
 347                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 348                                 }
 349 #else
 350                                 }
 351                         else
 352                                 skip=1;
 353
 354                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 355 #endif
 356                         s->init_num=0;
 357                         break;
 358
 359                 case SSL3_ST_CR_KEY_EXCH_A:
 360                 case SSL3_ST_CR_KEY_EXCH_B:
 361                         ret=ssl3_get_key_exchange(s);
 362                         if (ret <= 0) goto end;
 363                         s->state=SSL3_ST_CR_CERT_REQ_A;
 364                         s->init_num=0;
 365
 366                         /* at this point we check that we have the
 367                          * required stuff from the server */
 368                         if (!ssl3_check_cert_and_algorithm(s))
 369                                 {
 370                                 ret= -1;
 371                                 goto end;
 372                                 }
 373                         break;
 374
 375                 case SSL3_ST_CR_CERT_REQ_A:
 376                 case SSL3_ST_CR_CERT_REQ_B:
 377                         ret=ssl3_get_certificate_request(s);
 378                         if (ret <= 0) goto end;
 379                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_CR_SRVR_DONE_A:
 384                 case SSL3_ST_CR_SRVR_DONE_B:
 385                         ret=ssl3_get_server_done(s);
 386                         if (ret <= 0) goto end;
 387 #ifndef OPENSSL_NO_SRP
 388                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 389                                 {
 390                                 if ((ret = SRP_Calc_A_param(s))<=0)
 391                                         {
 392                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 393                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 394                                         goto end;
 395                                         }
 396                                 }
 397 #endif
 398                         if (s->s3->tmp.cert_req)
 399                                 s->state=SSL3_ST_CW_CERT_A;
 400                         else
 401                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 402                         s->init_num=0;
 403
 404                         break;
 405
 406                 case SSL3_ST_CW_CERT_A:
 407                 case SSL3_ST_CW_CERT_B:
 408                 case SSL3_ST_CW_CERT_C:
 409                 case SSL3_ST_CW_CERT_D:
 410                         ret=ssl3_send_client_certificate(s);
 411                         if (ret <= 0) goto end;
 412                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_CW_KEY_EXCH_A:
 417                 case SSL3_ST_CW_KEY_EXCH_B:
 418                         ret=ssl3_send_client_key_exchange(s);
 419                         if (ret <= 0) goto end;
 420                         /* EAY EAY EAY need to check for DH fix cert
 421                          * sent back */
 422                         /* For TLS, cert_req is set to 2, so a cert chain
 423                          * of nothing is sent, but no verify packet is sent */
 424                         /* XXX: For now, we do not support client
 425                          * authentication in ECDH cipher suites with
 426                          * ECDH (rather than ECDSA) certificates.
 427                          * We need to skip the certificate verify
 428                          * message when client's ECDH public key is sent
 429                          * inside the client certificate.
 430                          */
 431                         if (s->s3->tmp.cert_req == 1)
 432                                 {
 433                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 434                                 }
 435                         else
 436                                 {
 437                                 s->state=SSL3_ST_CW_CHANGE_A;
 438                                 s->s3->change_cipher_spec=0;
 439                                 }
 440                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 441                                 {
 442                                 s->state=SSL3_ST_CW_CHANGE_A;
 443                                 s->s3->change_cipher_spec=0;
 444                                 }
 445
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_CW_CERT_VRFY_A:
 450                 case SSL3_ST_CW_CERT_VRFY_B:
 451                         ret=ssl3_send_client_verify(s);
 452                         if (ret <= 0) goto end;
 453                         s->state=SSL3_ST_CW_CHANGE_A;
 454                         s->init_num=0;
 455                         s->s3->change_cipher_spec=0;
 456                         break;
 457
 458                 case SSL3_ST_CW_CHANGE_A:
 459                 case SSL3_ST_CW_CHANGE_B:
 460                         ret=ssl3_send_change_cipher_spec(s,
 461                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 462                         if (ret <= 0) goto end;
 463
 464 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 465                         s->state=SSL3_ST_CW_FINISHED_A;
 466 #else
 467                         if (s->s3->next_proto_neg_seen)
 468                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 469                         else
 470                                 s->state=SSL3_ST_CW_FINISHED_A;
 471 #endif
 472                         s->init_num=0;
 473
 474                         s->session->cipher=s->s3->tmp.new_cipher;
 475 #ifdef OPENSSL_NO_COMP
 476                         s->session->compress_meth=0;
 477 #else
 478                         if (s->s3->tmp.new_compression == NULL)
 479                                 s->session->compress_meth=0;
 480                         else
 481                                 s->session->compress_meth=
 482                                         s->s3->tmp.new_compression->id;
 483 #endif
 484                         if (!s->method->ssl3_enc->setup_key_block(s))
 485                                 {
 486                                 ret= -1;
 487                                 goto end;
 488                                 }
 489
 490                         if (!s->method->ssl3_enc->change_cipher_state(s,
 491                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 492                                 {
 493                                 ret= -1;
 494                                 goto end;
 495                                 }
 496
 497                         break;
 498
 499 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 500                 case SSL3_ST_CW_NEXT_PROTO_A:
 501                 case SSL3_ST_CW_NEXT_PROTO_B:
 502                         ret=ssl3_send_next_proto(s);
 503                         if (ret <= 0) goto end;
 504                         s->state=SSL3_ST_CW_FINISHED_A;
 505                         break;
 506 #endif
 507
 508                 case SSL3_ST_CW_FINISHED_A:
 509                 case SSL3_ST_CW_FINISHED_B:
 510                         ret=ssl3_send_finished(s,
 511                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 512                                 s->method->ssl3_enc->client_finished_label,
 513                                 s->method->ssl3_enc->client_finished_label_len);
 514                         if (ret <= 0) goto end;
 515                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 516                         s->state=SSL3_ST_CW_FLUSH;
 517
 518                         /* clear flags */
 519                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 520                         if (s->hit)
 521                                 {
 522                                 s->s3->tmp.next_state=SSL_ST_OK;
 523                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 524                                         {
 525                                         s->state=SSL_ST_OK;
 526                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 527                                         s->s3->delay_buf_pop_ret=0;
 528                                         }
 529                                 }
 530                         else
 531                                 {
 532 #ifndef OPENSSL_NO_TLSEXT
 533                                 /* Allow NewSessionTicket if ticket expected */
 534                                 if (s->tlsext_ticket_expected)
 535                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 536                                 else
 537 #endif
 538
 539                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 540                                 }
 541                         s->init_num=0;
 542                         break;
 543
 544 #ifndef OPENSSL_NO_TLSEXT
 545                 case SSL3_ST_CR_SESSION_TICKET_A:
 546                 case SSL3_ST_CR_SESSION_TICKET_B:
 547                         ret=ssl3_get_new_session_ticket(s);
 548                         if (ret <= 0) goto end;
 549                         s->state=SSL3_ST_CR_FINISHED_A;
 550                         s->init_num=0;
 551                 break;
 552
 553                 case SSL3_ST_CR_CERT_STATUS_A:
 554                 case SSL3_ST_CR_CERT_STATUS_B:
 555                         ret=ssl3_get_cert_status(s);
 556                         if (ret <= 0) goto end;
 557                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 558                         s->init_num=0;
 559                 break;
 560 #endif
 561
 562                 case SSL3_ST_CR_FINISHED_A:
 563                 case SSL3_ST_CR_FINISHED_B:
 564
 565                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 566                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 567                                 SSL3_ST_CR_FINISHED_B);
 568                         if (ret <= 0) goto end;
 569
 570                         if (s->hit)
 571                                 s->state=SSL3_ST_CW_CHANGE_A;
 572                         else
 573                                 s->state=SSL_ST_OK;
 574                         s->init_num=0;
 575                         break;
 576
 577                 case SSL3_ST_CW_FLUSH:
 578                         s->rwstate=SSL_WRITING;
 579                         if (BIO_flush(s->wbio) <= 0)
 580                                 {
 581                                 ret= -1;
 582                                 goto end;
 583                                 }
 584                         s->rwstate=SSL_NOTHING;
 585                         s->state=s->s3->tmp.next_state;
 586                         break;
 587
 588                 case SSL_ST_OK:
 589                         /* clean a few things up */
 590                         ssl3_cleanup_key_block(s);
 591
 592                         if (s->init_buf != NULL)
 593                                 {
 594                                 BUF_MEM_free(s->init_buf);
 595                                 s->init_buf=NULL;
 596                                 }
 597
 598                         /* If we are not 'joining' the last two packets,
 599                          * remove the buffering now */
 600                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 601                                 ssl_free_wbio_buffer(s);
 602                         /* else do it later in ssl3_write */
 603
 604                         s->init_num=0;
 605                         s->renegotiate=0;
 606                         s->new_session=0;
 607
 608                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 609                         if (s->hit) s->ctx->stats.sess_hit++;
 610
 611                         ret=1;
 612                         /* s->server=0; */
 613                         s->handshake_func=ssl3_connect;
 614                         s->ctx->stats.sess_connect_good++;
 615
 616                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 617
 618                         goto end;
 619                         /* break; */
 620
 621                 default:
 622                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 623                         ret= -1;
 624                         goto end;
 625                         /* break; */
 626                         }
 627
 628                 /* did we do anything */
 629                 if (!s->s3->tmp.reuse_message && !skip)
 630                         {
 631                         if (s->debug)
 632                                 {
 633                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 634                                         goto end;
 635                                 }
 636
 637                         if ((cb != NULL) && (s->state != state))
 638                                 {
 639                                 new_state=s->state;
 640                                 s->state=state;
 641                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 642                                 s->state=new_state;
 643                                 }
 644                         }
 645                 skip=0;
 646                 }
 647 end:
 648         s->in_handshake--;
 649         if (buf != NULL)
 650                 BUF_MEM_free(buf);
 651         if (cb != NULL)
 652                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 653         return(ret);
 654         }
 655
 656
 657 int ssl3_client_hello(SSL *s)
 658         {
 659         unsigned char *buf;
 660         unsigned char *p,*d;
 661         int i;
 662         unsigned long l;
 663         int al = 0;
 664 #ifndef OPENSSL_NO_COMP
 665         int j;
 666         SSL_COMP *comp;
 667 #endif
 668
 669         buf=(unsigned char *)s->init_buf->data;
 670         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 671                 {
 672                 SSL_SESSION *sess = s->session;
 673                 if ((sess == NULL) ||
 674                         (sess->ssl_version != s->version) ||
 675 #ifdef OPENSSL_NO_TLSEXT
 676                         !sess->session_id_length ||
 677 #else
 678                         (!sess->session_id_length && !sess->tlsext_tick) ||
 679 #endif
 680                         (sess->not_resumable))
 681                         {
 682                         if (!ssl_get_new_session(s,0))
 683                                 goto err;
 684                         }
 685                 if (s->method->version == DTLS_ANY_VERSION)
 686                         {
 687                         /* Determine which DTLS version to use */
 688                         int options = s->options;
 689                         /* If DTLS 1.2 disabled correct the version number */
 690                         if (options & SSL_OP_NO_DTLSv1_2)
 691                                 {
 692                                 if (tls1_suiteb(s))
 693                                         {
 694                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 695                                         goto err;
 696                                         }
 697                                 /* Disabling all versions is silly: return an
 698                                  * error.
 699                                  */
 700                                 if (options & SSL_OP_NO_DTLSv1)
 701                                         {
 702                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 703                                         goto err;
 704                                         }
 705                                 /* Update method so we don't use any DTLS 1.2
 706                                  * features.
 707                                  */
 708                                 s->method = DTLSv1_client_method();
 709                                 s->version = DTLS1_VERSION;
 710                                 }
 711                         else
 712                                 {
 713                                 /* We only support one version: update method */
 714                                 if (options & SSL_OP_NO_DTLSv1)
 715                                         s->method = DTLSv1_2_client_method();
 716                                 s->version = DTLS1_2_VERSION;
 717                                 }
 718                         s->client_version = s->version;
 719                         }
 720                 /* else use the pre-loaded session */
 721
 722                 p=s->s3->client_random;
 723
 724                 /* for DTLS if client_random is initialized, reuse it, we are
 725                  * required to use same upon reply to HelloVerify */
 726                 if (SSL_IS_DTLS(s))
 727                         {
 728                         size_t idx;
 729                         i = 1;
 730                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 731                                 {
 732                                 if (p[idx])
 733                                         {
 734                                         i = 0;
 735                                         break;
 736                                         }
 737                                 }
 738                         }
 739                 else
 740                         i = 1;
 741
 742                 if (i)
 743                         ssl_fill_hello_random(s, 0, p,
 744                                               sizeof(s->s3->client_random));
 745
 746                 /* Do the message type and length last */
 747                 d=p= ssl_handshake_start(s);
 748
 749                 /* version indicates the negotiated version: for example from
 750                  * an SSLv2/v3 compatible client hello). The client_version
 751                  * field is the maximum version we permit and it is also
 752                  * used in RSA encrypted premaster secrets. Some servers can
 753                  * choke if we initially report a higher version then
 754                  * renegotiate to a lower one in the premaster secret. This
 755                  * didn't happen with TLS 1.0 as most servers supported it
 756                  * but it can with TLS 1.1 or later if the server only supports
 757                  * 1.0.
 758                  *
 759                  * Possible scenario with previous logic:
 760                  *      1. Client hello indicates TLS 1.2
 761                  *      2. Server hello says TLS 1.0
 762                  *      3. RSA encrypted premaster secret uses 1.2.
 763                  *      4. Handhaked proceeds using TLS 1.0.
 764                  *      5. Server sends hello request to renegotiate.
 765                  *      6. Client hello indicates TLS v1.0 as we now
 766                  *         know that is maximum server supports.
 767                  *      7. Server chokes on RSA encrypted premaster secret
 768                  *         containing version 1.0.
 769                  *
 770                  * For interoperability it should be OK to always use the
 771                  * maximum version we support in client hello and then rely
 772                  * on the checking of version to ensure the servers isn't
 773                  * being inconsistent: for example initially negotiating with
 774                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 775                  * client_version in client hello and not resetting it to
 776                  * the negotiated version.
 777                  */
 778 #if 0
 779                 *(p++)=s->version>>8;
 780                 *(p++)=s->version&0xff;
 781                 s->client_version=s->version;
 782 #else
 783                 *(p++)=s->client_version>>8;
 784                 *(p++)=s->client_version&0xff;
 785 #endif
 786
 787                 /* Random stuff */
 788                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 789                 p+=SSL3_RANDOM_SIZE;
 790
 791                 /* Session ID */
 792                 if (s->new_session)
 793                         i=0;
 794                 else
 795                         i=s->session->session_id_length;
 796                 *(p++)=i;
 797                 if (i != 0)
 798                         {
 799                         if (i > (int)sizeof(s->session->session_id))
 800                                 {
 801                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 802                                 goto err;
 803                                 }
 804                         memcpy(p,s->session->session_id,i);
 805                         p+=i;
 806                         }
 807
 808                 /* cookie stuff for DTLS */
 809                 if (SSL_IS_DTLS(s))
 810                         {
 811                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 812                                 {
 813                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 814                                 goto err;
 815                                 }
 816                         *(p++) = s->d1->cookie_len;
 817                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 818                         p += s->d1->cookie_len;
 819                         }
 820
 821                 /* Ciphers supported */
 822                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 823                 if (i == 0)
 824                         {
 825                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 826                         goto err;
 827                         }
 828 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 829                         /* Some servers hang if client hello > 256 bytes
 830                          * as hack workaround chop number of supported ciphers
 831                          * to keep it well below this if we use TLS v1.2
 832                          */
 833                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 834                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 835                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 836 #endif
 837                 s2n(i,p);
 838                 p+=i;
 839
 840                 /* COMPRESSION */
 841 #ifdef OPENSSL_NO_COMP
 842                 *(p++)=1;
 843 #else
 844
 845                 if ((s->options & SSL_OP_NO_COMPRESSION)
 846                                         || !s->ctx->comp_methods)
 847                         j=0;
 848                 else
 849                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 850                 *(p++)=1+j;
 851                 for (i=0; i<j; i++)
 852                         {
 853                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 854                         *(p++)=comp->id;
 855                         }
 856 #endif
 857                 *(p++)=0; /* Add the NULL method */
 858
 859 #ifndef OPENSSL_NO_TLSEXT
 860                 /* TLS extensions*/
 861                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 862                         {
 863                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 864                         goto err;
 865                         }
 866                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 867                         {
 868                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 869                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 870                         goto err;
 871                         }
 872 #endif
 873
 874                 l= p-d;
 875                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 876                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 877                 }
 878
 879         /* SSL3_ST_CW_CLNT_HELLO_B */
 880         return ssl_do_write(s);
 881 err:
 882         return(-1);
 883         }
 884
 885 int ssl3_get_server_hello(SSL *s)
 886         {
 887         STACK_OF(SSL_CIPHER) *sk;
 888         const SSL_CIPHER *c;
 889         CERT *ct = s->cert;
 890         unsigned char *p,*d;
 891         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 892         unsigned int j;
 893         long n;
 894 #ifndef OPENSSL_NO_COMP
 895         SSL_COMP *comp;
 896 #endif
 897         /* Hello verify request and/or server hello version may not
 898          * match so set first packet if we're negotiating version.
 899          */
 900         if (SSL_IS_DTLS(s))
 901                 s->first_packet = 1;
 902
 903         n=s->method->ssl_get_message(s,
 904                 SSL3_ST_CR_SRVR_HELLO_A,
 905                 SSL3_ST_CR_SRVR_HELLO_B,
 906                 -1,
 907                 20000, /* ?? */
 908                 &ok);
 909
 910         if (!ok) return((int)n);
 911
 912         if (SSL_IS_DTLS(s))
 913                 {
 914                 s->first_packet = 0;
 915                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 916                         {
 917                         if ( s->d1->send_cookie == 0)
 918                                 {
 919                                 s->s3->tmp.reuse_message = 1;
 920                                 return 1;
 921                                 }
 922                         else /* already sent a cookie */
 923                                 {
 924                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 925                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 926                                 goto f_err;
 927                                 }
 928                         }
 929                 }
 930
 931         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 932                 {
 933                 al=SSL_AD_UNEXPECTED_MESSAGE;
 934                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 935                 goto f_err;
 936                 }
 937
 938         d=p=(unsigned char *)s->init_msg;
 939         if (s->method->version == DTLS_ANY_VERSION)
 940                 {
 941                 /* Work out correct protocol version to use */
 942                 int hversion = (p[0] << 8)|p[1];
 943                 int options = s->options;
 944                 if (hversion == DTLS1_2_VERSION
 945                         && !(options & SSL_OP_NO_DTLSv1_2))
 946                         s->method = DTLSv1_2_client_method();
 947                 else if (tls1_suiteb(s))
 948                         {
 949                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 950                         s->version = hversion;
 951                         al = SSL_AD_PROTOCOL_VERSION;
 952                         goto f_err;
 953                         }
 954                 else if (hversion == DTLS1_VERSION
 955                         && !(options & SSL_OP_NO_DTLSv1))
 956                         s->method = DTLSv1_client_method();
 957                 else
 958                         {
 959                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 960                         s->version = hversion;
 961                         al = SSL_AD_PROTOCOL_VERSION;
 962                         goto f_err;
 963                         }
 964                 s->version = s->client_version = s->method->version;
 965                 }
 966
 967         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 968                 {
 969                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 970                 s->version=(s->version&0xff00)|p[1];
 971                 al=SSL_AD_PROTOCOL_VERSION;
 972                 goto f_err;
 973                 }
 974         p+=2;
 975
 976         /* load the server hello data */
 977         /* load the server random */
 978         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 979         p+=SSL3_RANDOM_SIZE;
 980
 981         /* get the session-id */
 982         j= *(p++);
 983
 984         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 985                 {
 986                 al=SSL_AD_ILLEGAL_PARAMETER;
 987                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 988                 goto f_err;
 989                 }
 990
 991 #ifndef OPENSSL_NO_TLSEXT
 992         /* check if we want to resume the session based on external pre-shared secret */
 993         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 994                 {
 995                 SSL_CIPHER *pref_cipher=NULL;
 996                 s->session->master_key_length=sizeof(s->session->master_key);
 997                 if (s->tls_session_secret_cb(s, s->session->master_key,
 998                                              &s->session->master_key_length,
 999                                              NULL, &pref_cipher,
1000                                              s->tls_session_secret_cb_arg))
1001                         {
1002                         s->session->cipher = pref_cipher ?
1003                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1004                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1005                         }
1006                 }
1007 #endif /* OPENSSL_NO_TLSEXT */
1008
1009         if (j != 0 && j == s->session->session_id_length
1010             && memcmp(p,s->session->session_id,j) == 0)
1011             {
1012             if(s->sid_ctx_length != s->session->sid_ctx_length
1013                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1014                 {
1015                 /* actually a client application bug */
1016                 al=SSL_AD_ILLEGAL_PARAMETER;
1017                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1018                 goto f_err;
1019                 }
1020             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1021             s->hit=1;
1022             }
1023         else    /* a miss or crap from the other end */
1024                 {
1025                 /* If we were trying for session-id reuse, make a new
1026                  * SSL_SESSION so we don't stuff up other people */
1027                 s->hit=0;
1028                 if (s->session->session_id_length > 0)
1029                         {
1030                         if (!ssl_get_new_session(s,0))
1031                                 {
1032                                 goto f_err;
1033                                 }
1034                         }
1035                 s->session->session_id_length=j;
1036                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1037                 }
1038         p+=j;
1039         c=ssl_get_cipher_by_char(s,p);
1040         if (c == NULL)
1041                 {
1042                 /* unknown cipher */
1043                 al=SSL_AD_ILLEGAL_PARAMETER;
1044                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1045                 goto f_err;
1046                 }
1047         /* If it is a disabled cipher we didn't send it in client hello,
1048          * so return an error.
1049          */
1050         if (c->algorithm_ssl & ct->mask_ssl ||
1051                 c->algorithm_mkey & ct->mask_k ||
1052                 c->algorithm_auth & ct->mask_a)
1053                 {
1054                 al=SSL_AD_ILLEGAL_PARAMETER;
1055                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1056                 goto f_err;
1057                 }
1058         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1059
1060         sk=ssl_get_ciphers_by_id(s);
1061         i=sk_SSL_CIPHER_find(sk,c);
1062         if (i < 0)
1063                 {
1064                 /* we did not say we would use this cipher */
1065                 al=SSL_AD_ILLEGAL_PARAMETER;
1066                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1067                 goto f_err;
1068                 }
1069
1070         /* Depending on the session caching (internal/external), the cipher
1071            and/or cipher_id values may not be set. Make sure that
1072            cipher_id is set and use it for comparison. */
1073         if (s->session->cipher)
1074                 s->session->cipher_id = s->session->cipher->id;
1075         if (s->hit && (s->session->cipher_id != c->id))
1076                 {
1077 /* Workaround is now obsolete */
1078 #if 0
1079                 if (!(s->options &
1080                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1081 #endif
1082                         {
1083                         al=SSL_AD_ILLEGAL_PARAMETER;
1084                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1085                         goto f_err;
1086                         }
1087                 }
1088         s->s3->tmp.new_cipher=c;
1089         /* Don't digest cached records if no sigalgs: we may need them for
1090          * client authentication.
1091          */
1092         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1093                 goto f_err;
1094         /* lets get the compression algorithm */
1095         /* COMPRESSION */
1096 #ifdef OPENSSL_NO_COMP
1097         if (*(p++) != 0)
1098                 {
1099                 al=SSL_AD_ILLEGAL_PARAMETER;
1100                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1101                 goto f_err;
1102                 }
1103         /* If compression is disabled we'd better not try to resume a session
1104          * using compression.
1105          */
1106         if (s->session->compress_meth != 0)
1107                 {
1108                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1109                 goto f_err;
1110                 }
1111 #else
1112         j= *(p++);
1113         if (s->hit && j != s->session->compress_meth)
1114                 {
1115                 al=SSL_AD_ILLEGAL_PARAMETER;
1116                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1117                 goto f_err;
1118                 }
1119         if (j == 0)
1120                 comp=NULL;
1121         else if (s->options & SSL_OP_NO_COMPRESSION)
1122                 {
1123                 al=SSL_AD_ILLEGAL_PARAMETER;
1124                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1125                 goto f_err;
1126                 }
1127         else
1128                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1129
1130         if ((j != 0) && (comp == NULL))
1131                 {
1132                 al=SSL_AD_ILLEGAL_PARAMETER;
1133                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1134                 goto f_err;
1135                 }
1136         else
1137                 {
1138                 s->s3->tmp.new_compression=comp;
1139                 }
1140 #endif
1141
1142 #ifndef OPENSSL_NO_TLSEXT
1143         /* TLS extensions*/
1144         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1145                 {
1146                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1147                 goto err;
1148                 }
1149 #endif
1150
1151         if (p != (d+n))
1152                 {
1153                 /* wrong packet length */
1154                 al=SSL_AD_DECODE_ERROR;
1155                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1156                 goto f_err;
1157                 }
1158
1159         return(1);
1160 f_err:
1161         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1162 err:
1163         return(-1);
1164         }
1165
1166 int ssl3_get_server_certificate(SSL *s)
1167         {
1168         int al,i,ok,ret= -1;
1169         unsigned long n,nc,llen,l;
1170         X509 *x=NULL;
1171         const unsigned char *q,*p;
1172         unsigned char *d;
1173         STACK_OF(X509) *sk=NULL;
1174         SESS_CERT *sc;
1175         EVP_PKEY *pkey=NULL;
1176         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1177
1178         n=s->method->ssl_get_message(s,
1179                 SSL3_ST_CR_CERT_A,
1180                 SSL3_ST_CR_CERT_B,
1181                 -1,
1182                 s->max_cert_list,
1183                 &ok);
1184
1185         if (!ok) return((int)n);
1186
1187         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1188                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1189                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1190                 {
1191                 s->s3->tmp.reuse_message=1;
1192                 return(1);
1193                 }
1194
1195         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1196                 {
1197                 al=SSL_AD_UNEXPECTED_MESSAGE;
1198                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1199                 goto f_err;
1200                 }
1201         p=d=(unsigned char *)s->init_msg;
1202
1203         if ((sk=sk_X509_new_null()) == NULL)
1204                 {
1205                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1206                 goto err;
1207                 }
1208
1209         n2l3(p,llen);
1210         if (llen+3 != n)
1211                 {
1212                 al=SSL_AD_DECODE_ERROR;
1213                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1214                 goto f_err;
1215                 }
1216         for (nc=0; nc<llen; )
1217                 {
1218                 n2l3(p,l);
1219                 if ((l+nc+3) > llen)
1220                         {
1221                         al=SSL_AD_DECODE_ERROR;
1222                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1223                         goto f_err;
1224                         }
1225
1226                 q=p;
1227                 x=d2i_X509(NULL,&q,l);
1228                 if (x == NULL)
1229                         {
1230                         al=SSL_AD_BAD_CERTIFICATE;
1231                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1232                         goto f_err;
1233                         }
1234                 if (q != (p+l))
1235                         {
1236                         al=SSL_AD_DECODE_ERROR;
1237                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1238                         goto f_err;
1239                         }
1240                 if (!sk_X509_push(sk,x))
1241                         {
1242                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1243                         goto err;
1244                         }
1245                 x=NULL;
1246                 nc+=l+3;
1247                 p=q;
1248                 }
1249
1250         i=ssl_verify_cert_chain(s,sk);
1251         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1252 #ifndef OPENSSL_NO_KRB5
1253             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1254                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1255 #endif /* OPENSSL_NO_KRB5 */
1256                 )
1257                 {
1258                 al=ssl_verify_alarm_type(s->verify_result);
1259                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1260                 goto f_err;
1261                 }
1262         ERR_clear_error(); /* but we keep s->verify_result */
1263
1264         sc=ssl_sess_cert_new();
1265         if (sc == NULL) goto err;
1266
1267         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1268         s->session->sess_cert=sc;
1269
1270         sc->cert_chain=sk;
1271         /* Inconsistency alert: cert_chain does include the peer's
1272          * certificate, which we don't include in s3_srvr.c */
1273         x=sk_X509_value(sk,0);
1274         sk=NULL;
1275         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1276
1277         pkey=X509_get_pubkey(x);
1278
1279         /* VRS: allow null cert if auth == KRB5 */
1280         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1281                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1282                     ? 0 : 1;
1283
1284 #ifdef KSSL_DEBUG
1285         printf("pkey,x = %p, %p\n", pkey,x);
1286         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1287         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1288                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1289 #endif    /* KSSL_DEBUG */
1290
1291         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1292                 {
1293                 x=NULL;
1294                 al=SSL3_AL_FATAL;
1295                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1296                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1297                 goto f_err;
1298                 }
1299
1300         i=ssl_cert_type(x,pkey);
1301         if (need_cert && i < 0)
1302                 {
1303                 x=NULL;
1304                 al=SSL3_AL_FATAL;
1305                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1306                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1307                 goto f_err;
1308                 }
1309
1310         if (need_cert)
1311                 {
1312                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1313                 if (exp_idx >= 0 && i != exp_idx)
1314                         {
1315                         x=NULL;
1316                         al=SSL_AD_ILLEGAL_PARAMETER;
1317                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1318                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1319                         goto f_err;
1320                         }
1321                 sc->peer_cert_type=i;
1322                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1323                 /* Why would the following ever happen?
1324                  * We just created sc a couple of lines ago. */
1325                 if (sc->peer_pkeys[i].x509 != NULL)
1326                         X509_free(sc->peer_pkeys[i].x509);
1327                 sc->peer_pkeys[i].x509=x;
1328                 sc->peer_key= &(sc->peer_pkeys[i]);
1329
1330                 if (s->session->peer != NULL)
1331                         X509_free(s->session->peer);
1332                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1333                 s->session->peer=x;
1334                 }
1335         else
1336                 {
1337                 sc->peer_cert_type=i;
1338                 sc->peer_key= NULL;
1339
1340                 if (s->session->peer != NULL)
1341                         X509_free(s->session->peer);
1342                 s->session->peer=NULL;
1343                 }
1344         s->session->verify_result = s->verify_result;
1345
1346         x=NULL;
1347         ret=1;
1348         if (0)
1349                 {
1350 f_err:
1351                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1352                 }
1353 err:
1354         EVP_PKEY_free(pkey);
1355         X509_free(x);
1356         sk_X509_pop_free(sk,X509_free);
1357         return(ret);
1358         }
1359
1360 int ssl3_get_key_exchange(SSL *s)
1361         {
1362 #ifndef OPENSSL_NO_RSA
1363         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1364 #endif
1365         EVP_MD_CTX md_ctx;
1366         unsigned char *param,*p;
1367         int al,j,ok;
1368         long i,param_len,n,alg_k,alg_a;
1369         EVP_PKEY *pkey=NULL;
1370         const EVP_MD *md = NULL;
1371 #ifndef OPENSSL_NO_RSA
1372         RSA *rsa=NULL;
1373 #endif
1374 #ifndef OPENSSL_NO_DH
1375         DH *dh=NULL;
1376 #endif
1377 #ifndef OPENSSL_NO_ECDH
1378         EC_KEY *ecdh = NULL;
1379         BN_CTX *bn_ctx = NULL;
1380         EC_POINT *srvr_ecpoint = NULL;
1381         int curve_nid = 0;
1382         int encoded_pt_len = 0;
1383 #endif
1384
1385         /* use same message size as in ssl3_get_certificate_request()
1386          * as ServerKeyExchange message may be skipped */
1387         n=s->method->ssl_get_message(s,
1388                 SSL3_ST_CR_KEY_EXCH_A,
1389                 SSL3_ST_CR_KEY_EXCH_B,
1390                 -1,
1391                 s->max_cert_list,
1392                 &ok);
1393         if (!ok) return((int)n);
1394
1395         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1396                 {
1397 #ifndef OPENSSL_NO_PSK
1398                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1399                    omitted if no identity hint is sent. Set
1400                    session->sess_cert anyway to avoid problems
1401                    later.*/
1402                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1403                         {
1404                         s->session->sess_cert=ssl_sess_cert_new();
1405                         if (s->ctx->psk_identity_hint)
1406                                 OPENSSL_free(s->ctx->psk_identity_hint);
1407                         s->ctx->psk_identity_hint = NULL;
1408                         }
1409 #endif
1410                 s->s3->tmp.reuse_message=1;
1411                 return(1);
1412                 }
1413
1414         param=p=(unsigned char *)s->init_msg;
1415         if (s->session->sess_cert != NULL)
1416                 {
1417 #ifndef OPENSSL_NO_RSA
1418                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1419                         {
1420                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1421                         s->session->sess_cert->peer_rsa_tmp=NULL;
1422                         }
1423 #endif
1424 #ifndef OPENSSL_NO_DH
1425                 if (s->session->sess_cert->peer_dh_tmp)
1426                         {
1427                         DH_free(s->session->sess_cert->peer_dh_tmp);
1428                         s->session->sess_cert->peer_dh_tmp=NULL;
1429                         }
1430 #endif
1431 #ifndef OPENSSL_NO_ECDH
1432                 if (s->session->sess_cert->peer_ecdh_tmp)
1433                         {
1434                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1435                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1436                         }
1437 #endif
1438                 }
1439         else
1440                 {
1441                 s->session->sess_cert=ssl_sess_cert_new();
1442                 }
1443
1444         /* Total length of the parameters including the length prefix */
1445         param_len=0;
1446
1447         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1448         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1449         EVP_MD_CTX_init(&md_ctx);
1450
1451         al=SSL_AD_DECODE_ERROR;
1452
1453 #ifndef OPENSSL_NO_PSK
1454         if (alg_k & SSL_kPSK)
1455                 {
1456                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1457
1458                 param_len = 2;
1459                 if (param_len > n)
1460                         {
1461                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1462                                 SSL_R_LENGTH_TOO_SHORT);
1463                         goto f_err;
1464                         }
1465                 n2s(p,i);
1466
1467                 /* Store PSK identity hint for later use, hint is used
1468                  * in ssl3_send_client_key_exchange.  Assume that the
1469                  * maximum length of a PSK identity hint can be as
1470                  * long as the maximum length of a PSK identity. */
1471                 if (i > PSK_MAX_IDENTITY_LEN)
1472                         {
1473                         al=SSL_AD_HANDSHAKE_FAILURE;
1474                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1475                                 SSL_R_DATA_LENGTH_TOO_LONG);
1476                         goto f_err;
1477                         }
1478                 if (i > n - param_len)
1479                         {
1480                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1481                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1482                         goto f_err;
1483                         }
1484                 param_len += i;
1485
1486                 /* If received PSK identity hint contains NULL
1487                  * characters, the hint is truncated from the first
1488                  * NULL. p may not be ending with NULL, so create a
1489                  * NULL-terminated string. */
1490                 memcpy(tmp_id_hint, p, i);
1491                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1492                 if (s->ctx->psk_identity_hint != NULL)
1493                         OPENSSL_free(s->ctx->psk_identity_hint);
1494                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1495                 if (s->ctx->psk_identity_hint == NULL)
1496                         {
1497                         al=SSL_AD_HANDSHAKE_FAILURE;
1498                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1499                         goto f_err;
1500                         }
1501
1502                 p+=i;
1503                 n-=param_len;
1504                 }
1505         else
1506 #endif /* !OPENSSL_NO_PSK */
1507 #ifndef OPENSSL_NO_SRP
1508         if (alg_k & SSL_kSRP)
1509                 {
1510                 param_len = 2;
1511                 if (param_len > n)
1512                         {
1513                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1514                                 SSL_R_LENGTH_TOO_SHORT);
1515                         goto f_err;
1516                         }
1517                 n2s(p,i);
1518
1519                 if (i > n - param_len)
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1522                         goto f_err;
1523                         }
1524                 param_len += i;
1525
1526                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1527                         {
1528                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1529                         goto err;
1530                         }
1531                 p+=i;
1532
1533
1534                 if (2 > n - param_len)
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1537                                 SSL_R_LENGTH_TOO_SHORT);
1538                         goto f_err;
1539                         }
1540                 param_len += 2;
1541
1542                 n2s(p,i);
1543
1544                 if (i > n - param_len)
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1547                         goto f_err;
1548                         }
1549                 param_len += i;
1550
1551                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1552                         {
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1554                         goto err;
1555                         }
1556                 p+=i;
1557
1558
1559                 if (1 > n - param_len)
1560                         {
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1562                                 SSL_R_LENGTH_TOO_SHORT);
1563                         goto f_err;
1564                         }
1565                 param_len += 1;
1566
1567                 i = (unsigned int)(p[0]);
1568                 p++;
1569
1570                 if (i > n - param_len)
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1573                         goto f_err;
1574                         }
1575                 param_len += i;
1576
1577                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1580                         goto err;
1581                         }
1582                 p+=i;
1583
1584                 if (2 > n - param_len)
1585                         {
1586                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1587                                 SSL_R_LENGTH_TOO_SHORT);
1588                         goto f_err;
1589                         }
1590                 param_len += 2;
1591
1592                 n2s(p,i);
1593
1594                 if (i > n - param_len)
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1597                         goto f_err;
1598                         }
1599                 param_len += i;
1600
1601                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1602                         {
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1604                         goto err;
1605                         }
1606                 p+=i;
1607                 n-=param_len;
1608
1609                 if (!srp_verify_server_param(s, &al))
1610                         {
1611                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1612                         goto f_err;
1613                         }
1614
1615 /* We must check if there is a certificate */
1616 #ifndef OPENSSL_NO_RSA
1617                 if (alg_a & SSL_aRSA)
1618                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1619 #else
1620                 if (0)
1621                         ;
1622 #endif
1623 #ifndef OPENSSL_NO_DSA
1624                 else if (alg_a & SSL_aDSS)
1625                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1626 #endif
1627                 }
1628         else
1629 #endif /* !OPENSSL_NO_SRP */
1630 #ifndef OPENSSL_NO_RSA
1631         if (alg_k & SSL_kRSA)
1632                 {
1633                 if ((rsa=RSA_new()) == NULL)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1636                         goto err;
1637                         }
1638
1639                 param_len = 2;
1640                 if (param_len > n)
1641                         {
1642                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1643                                 SSL_R_LENGTH_TOO_SHORT);
1644                         goto f_err;
1645                         }
1646                 n2s(p,i);
1647
1648                 if (i > n - param_len)
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1651                         goto f_err;
1652                         }
1653                 param_len += i;
1654
1655                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1658                         goto err;
1659                         }
1660                 p+=i;
1661
1662                 if (2 > n - param_len)
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1665                                 SSL_R_LENGTH_TOO_SHORT);
1666                         goto f_err;
1667                         }
1668                 param_len += 2;
1669
1670                 n2s(p,i);
1671
1672                 if (i > n - param_len)
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1675                         goto f_err;
1676                         }
1677                 param_len += i;
1678
1679                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1680                         {
1681                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1682                         goto err;
1683                         }
1684                 p+=i;
1685                 n-=param_len;
1686
1687                 /* this should be because we are using an export cipher */
1688                 if (alg_a & SSL_aRSA)
1689                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1690                 else
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1693                         goto err;
1694                         }
1695                 s->session->sess_cert->peer_rsa_tmp=rsa;
1696                 rsa=NULL;
1697                 }
1698 #else /* OPENSSL_NO_RSA */
1699         if (0)
1700                 ;
1701 #endif
1702 #ifndef OPENSSL_NO_DH
1703         else if (alg_k & SSL_kEDH)
1704                 {
1705                 if ((dh=DH_new()) == NULL)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1708                         goto err;
1709                         }
1710
1711                 param_len = 2;
1712                 if (param_len > n)
1713                         {
1714                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1715                                 SSL_R_LENGTH_TOO_SHORT);
1716                         goto f_err;
1717                         }
1718                 n2s(p,i);
1719
1720                 if (i > n - param_len)
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1723                         goto f_err;
1724                         }
1725                 param_len += i;
1726
1727                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1728                         {
1729                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1730                         goto err;
1731                         }
1732                 p+=i;
1733
1734                 if (2 > n - param_len)
1735                         {
1736                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1737                                 SSL_R_LENGTH_TOO_SHORT);
1738                         goto f_err;
1739                         }
1740                 param_len += 2;
1741
1742                 n2s(p,i);
1743
1744                 if (i > n - param_len)
1745                         {
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1747                         goto f_err;
1748                         }
1749                 param_len += i;
1750
1751                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1754                         goto err;
1755                         }
1756                 p+=i;
1757
1758                 if (2 > n - param_len)
1759                         {
1760                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1761                                 SSL_R_LENGTH_TOO_SHORT);
1762                         goto f_err;
1763                         }
1764                 param_len += 2;
1765
1766                 n2s(p,i);
1767
1768                 if (i > n - param_len)
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1771                         goto f_err;
1772                         }
1773                 param_len += i;
1774
1775                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1776                         {
1777                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1778                         goto err;
1779                         }
1780                 p+=i;
1781                 n-=param_len;
1782
1783 #ifndef OPENSSL_NO_RSA
1784                 if (alg_a & SSL_aRSA)
1785                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1786 #else
1787                 if (0)
1788                         ;
1789 #endif
1790 #ifndef OPENSSL_NO_DSA
1791                 else if (alg_a & SSL_aDSS)
1792                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1793 #endif
1794                 /* else anonymous DH, so no certificate or pkey. */
1795
1796                 s->session->sess_cert->peer_dh_tmp=dh;
1797                 dh=NULL;
1798                 }
1799         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1800                 {
1801                 al=SSL_AD_ILLEGAL_PARAMETER;
1802                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1803                 goto f_err;
1804                 }
1805 #endif /* !OPENSSL_NO_DH */
1806
1807 #ifndef OPENSSL_NO_ECDH
1808         else if (alg_k & SSL_kEECDH)
1809                 {
1810                 EC_GROUP *ngroup;
1811                 const EC_GROUP *group;
1812
1813                 if ((ecdh=EC_KEY_new()) == NULL)
1814                         {
1815                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1816                         goto err;
1817                         }
1818
1819                 /* Extract elliptic curve parameters and the
1820                  * server's ephemeral ECDH public key.
1821                  * Keep accumulating lengths of various components in
1822                  * param_len and make sure it never exceeds n.
1823                  */
1824
1825                 /* XXX: For now we only support named (not generic) curves
1826                  * and the ECParameters in this case is just three bytes. We
1827                  * also need one byte for the length of the encoded point
1828                  */
1829                 param_len=4;
1830                 if (param_len > n)
1831                         {
1832                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1833                                 SSL_R_LENGTH_TOO_SHORT);
1834                         goto f_err;
1835                         }
1836                 /* Check curve is one of our preferences, if not server has
1837                  * sent an invalid curve. ECParameters is 3 bytes.
1838                  */
1839                 if (!tls1_check_curve(s, p, 3))
1840                         {
1841                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1842                         goto f_err;
1843                         }
1844
1845                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1846                         {
1847                         al=SSL_AD_INTERNAL_ERROR;
1848                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1849                         goto f_err;
1850                         }
1851
1852                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1853                 if (ngroup == NULL)
1854                         {
1855                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1856                         goto err;
1857                         }
1858                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1859                         {
1860                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1861                         goto err;
1862                         }
1863                 EC_GROUP_free(ngroup);
1864
1865                 group = EC_KEY_get0_group(ecdh);
1866
1867                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1868                     (EC_GROUP_get_degree(group) > 163))
1869                         {
1870                         al=SSL_AD_EXPORT_RESTRICTION;
1871                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1872                         goto f_err;
1873                         }
1874
1875                 p+=3;
1876
1877                 /* Next, get the encoded ECPoint */
1878                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1879                     ((bn_ctx = BN_CTX_new()) == NULL))
1880                         {
1881                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1882                         goto err;
1883                         }
1884
1885                 encoded_pt_len = *p;  /* length of encoded point */
1886                 p+=1;
1887
1888                 if ((encoded_pt_len > n - param_len) ||
1889                     (EC_POINT_oct2point(group, srvr_ecpoint,
1890                         p, encoded_pt_len, bn_ctx) == 0))
1891                         {
1892                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1893                         goto f_err;
1894                         }
1895                 param_len += encoded_pt_len;
1896
1897                 n-=param_len;
1898                 p+=encoded_pt_len;
1899
1900                 /* The ECC/TLS specification does not mention
1901                  * the use of DSA to sign ECParameters in the server
1902                  * key exchange message. We do support RSA and ECDSA.
1903                  */
1904                 if (0) ;
1905 #ifndef OPENSSL_NO_RSA
1906                 else if (alg_a & SSL_aRSA)
1907                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1908 #endif
1909 #ifndef OPENSSL_NO_ECDSA
1910                 else if (alg_a & SSL_aECDSA)
1911                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1912 #endif
1913                 /* else anonymous ECDH, so no certificate or pkey. */
1914                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1915                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1916                 ecdh=NULL;
1917                 BN_CTX_free(bn_ctx);
1918                 bn_ctx = NULL;
1919                 EC_POINT_free(srvr_ecpoint);
1920                 srvr_ecpoint = NULL;
1921                 }
1922         else if (alg_k)
1923                 {
1924                 al=SSL_AD_UNEXPECTED_MESSAGE;
1925                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1926                 goto f_err;
1927                 }
1928 #endif /* !OPENSSL_NO_ECDH */
1929
1930
1931         /* p points to the next byte, there are 'n' bytes left */
1932
1933         /* if it was signed, check the signature */
1934         if (pkey != NULL)
1935                 {
1936                 if (SSL_USE_SIGALGS(s))
1937                         {
1938                         int rv;
1939                         if (2 > n)
1940                                 {
1941                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1942                                         SSL_R_LENGTH_TOO_SHORT);
1943                                 goto f_err;
1944                                 }
1945                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1946                         if (rv == -1)
1947                                 goto err;
1948                         else if (rv == 0)
1949                                 {
1950                                 goto f_err;
1951                                 }
1952 #ifdef SSL_DEBUG
1953 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1954 #endif
1955                         p += 2;
1956                         n -= 2;
1957                         }
1958                 else
1959                         md = EVP_sha1();
1960
1961                 if (2 > n)
1962                         {
1963                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1964                                 SSL_R_LENGTH_TOO_SHORT);
1965                         goto f_err;
1966                         }
1967                 n2s(p,i);
1968                 n-=2;
1969                 j=EVP_PKEY_size(pkey);
1970
1971                 /* Check signature length. If n is 0 then signature is empty */
1972                 if ((i != n) || (n > j) || (n <= 0))
1973                         {
1974                         /* wrong packet length */
1975                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1976                         goto f_err;
1977                         }
1978
1979 #ifndef OPENSSL_NO_RSA
1980                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1981                         {
1982                         int num;
1983                         unsigned int size;
1984
1985                         j=0;
1986                         q=md_buf;
1987                         for (num=2; num > 0; num--)
1988                                 {
1989                                 EVP_MD_CTX_set_flags(&md_ctx,
1990                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1991                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1992                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1993                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1994                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1995                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1996                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1997                                 q+=size;
1998                                 j+=size;
1999                                 }
2000                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2001                                                                 pkey->pkey.rsa);
2002                         if (i < 0)
2003                                 {
2004                                 al=SSL_AD_DECRYPT_ERROR;
2005                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2006                                 goto f_err;
2007                                 }
2008                         if (i == 0)
2009                                 {
2010                                 /* bad signature */
2011                                 al=SSL_AD_DECRYPT_ERROR;
2012                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2013                                 goto f_err;
2014                                 }
2015                         }
2016                 else
2017 #endif
2018                         {
2019                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2020                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2021                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2022                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2023                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2024                                 {
2025                                 /* bad signature */
2026                                 al=SSL_AD_DECRYPT_ERROR;
2027                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2028                                 goto f_err;
2029                                 }
2030                         }
2031                 }
2032         else
2033                 {
2034                 /* aNULL, aSRP or kPSK do not need public keys */
2035                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2036                         {
2037                         /* Might be wrong key type, check it */
2038                         if (ssl3_check_cert_and_algorithm(s))
2039                                 /* Otherwise this shouldn't happen */
2040                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2041                         goto err;
2042                         }
2043                 /* still data left over */
2044                 if (n != 0)
2045                         {
2046                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2047                         goto f_err;
2048                         }
2049                 }
2050         EVP_PKEY_free(pkey);
2051         EVP_MD_CTX_cleanup(&md_ctx);
2052         return(1);
2053 f_err:
2054         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2055 err:
2056         EVP_PKEY_free(pkey);
2057 #ifndef OPENSSL_NO_RSA
2058         if (rsa != NULL)
2059                 RSA_free(rsa);
2060 #endif
2061 #ifndef OPENSSL_NO_DH
2062         if (dh != NULL)
2063                 DH_free(dh);
2064 #endif
2065 #ifndef OPENSSL_NO_ECDH
2066         BN_CTX_free(bn_ctx);
2067         EC_POINT_free(srvr_ecpoint);
2068         if (ecdh != NULL)
2069                 EC_KEY_free(ecdh);
2070 #endif
2071         EVP_MD_CTX_cleanup(&md_ctx);
2072         return(-1);
2073         }
2074
2075 int ssl3_get_certificate_request(SSL *s)
2076         {
2077         int ok,ret=0;
2078         unsigned long n,nc,l;
2079         unsigned int llen, ctype_num,i;
2080         X509_NAME *xn=NULL;
2081         const unsigned char *p,*q;
2082         unsigned char *d;
2083         STACK_OF(X509_NAME) *ca_sk=NULL;
2084
2085         n=s->method->ssl_get_message(s,
2086                 SSL3_ST_CR_CERT_REQ_A,
2087                 SSL3_ST_CR_CERT_REQ_B,
2088                 -1,
2089                 s->max_cert_list,
2090                 &ok);
2091
2092         if (!ok) return((int)n);
2093
2094         s->s3->tmp.cert_req=0;
2095
2096         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2097                 {
2098                 s->s3->tmp.reuse_message=1;
2099                 /* If we get here we don't need any cached handshake records
2100                  * as we wont be doing client auth.
2101                  */
2102                 if (s->s3->handshake_buffer)
2103                         {
2104                         if (!ssl3_digest_cached_records(s))
2105                                 goto err;
2106                         }
2107                 return(1);
2108                 }
2109
2110         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2111                 {
2112                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2113                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2114                 goto err;
2115                 }
2116
2117         /* TLS does not like anon-DH with client cert */
2118         if (s->version > SSL3_VERSION)
2119                 {
2120                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2121                         {
2122                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2123                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2124                         goto err;
2125                         }
2126                 }
2127
2128         p=d=(unsigned char *)s->init_msg;
2129
2130         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2131                 {
2132                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2133                 goto err;
2134                 }
2135
2136         /* get the certificate types */
2137         ctype_num= *(p++);
2138         if (s->cert->ctypes)
2139                 {
2140                 OPENSSL_free(s->cert->ctypes);
2141                 s->cert->ctypes = NULL;
2142                 }
2143         if (ctype_num > SSL3_CT_NUMBER)
2144                 {
2145                 /* If we exceed static buffer copy all to cert structure */
2146                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2147                 memcpy(s->cert->ctypes, p, ctype_num);
2148                 s->cert->ctype_num = (size_t)ctype_num;
2149                 ctype_num=SSL3_CT_NUMBER;
2150                 }
2151         for (i=0; i<ctype_num; i++)
2152                 s->s3->tmp.ctype[i]= p[i];
2153         p+=p[-1];
2154         if (SSL_USE_SIGALGS(s))
2155                 {
2156                 n2s(p, llen);
2157                 /* Check we have enough room for signature algorithms and
2158                  * following length value.
2159                  */
2160                 if ((unsigned long)(p - d + llen + 2) > n)
2161                         {
2162                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2163                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2164                         goto err;
2165                         }
2166                 /* Clear certificate digests and validity flags */
2167                 for (i = 0; i < SSL_PKEY_NUM; i++)
2168                         {
2169                         s->cert->pkeys[i].digest = NULL;
2170                         s->cert->pkeys[i].valid_flags = 0;
2171                         }
2172                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2173                         {
2174                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2175                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2176                         goto err;
2177                         }
2178                 if (!tls1_process_sigalgs(s))
2179                         {
2180                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2181                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2182                         goto err;
2183                         }
2184                 p += llen;
2185                 }
2186
2187         /* get the CA RDNs */
2188         n2s(p,llen);
2189 #if 0
2190 {
2191 FILE *out;
2192 out=fopen("/tmp/vsign.der","w");
2193 fwrite(p,1,llen,out);
2194 fclose(out);
2195 }
2196 #endif
2197
2198         if ((unsigned long)(p - d + llen) != n)
2199                 {
2200                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2201                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2202                 goto err;
2203                 }
2204
2205         for (nc=0; nc<llen; )
2206                 {
2207                 n2s(p,l);
2208                 if ((l+nc+2) > llen)
2209                         {
2210                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2211                                 goto cont; /* netscape bugs */
2212                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2213                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2214                         goto err;
2215                         }
2216
2217                 q=p;
2218
2219                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2220                         {
2221                         /* If netscape tolerance is on, ignore errors */
2222                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2223                                 goto cont;
2224                         else
2225                                 {
2226                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2227                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2228                                 goto err;
2229                                 }
2230                         }
2231
2232                 if (q != (p+l))
2233                         {
2234                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2235                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2236                         goto err;
2237                         }
2238                 if (!sk_X509_NAME_push(ca_sk,xn))
2239                         {
2240                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2241                         goto err;
2242                         }
2243
2244                 p+=l;
2245                 nc+=l+2;
2246                 }
2247
2248         if (0)
2249                 {
2250 cont:
2251                 ERR_clear_error();
2252                 }
2253
2254         /* we should setup a certificate to return.... */
2255         s->s3->tmp.cert_req=1;
2256         s->s3->tmp.ctype_num=ctype_num;
2257         if (s->s3->tmp.ca_names != NULL)
2258                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2259         s->s3->tmp.ca_names=ca_sk;
2260         ca_sk=NULL;
2261
2262         ret=1;
2263 err:
2264         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2265         return(ret);
2266         }
2267
2268 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2269         {
2270         return(X509_NAME_cmp(*a,*b));
2271         }
2272 #ifndef OPENSSL_NO_TLSEXT
2273 int ssl3_get_new_session_ticket(SSL *s)
2274         {
2275         int ok,al,ret=0, ticklen;
2276         long n;
2277         const unsigned char *p;
2278         unsigned char *d;
2279
2280         n=s->method->ssl_get_message(s,
2281                 SSL3_ST_CR_SESSION_TICKET_A,
2282                 SSL3_ST_CR_SESSION_TICKET_B,
2283                 -1,
2284                 16384,
2285                 &ok);
2286
2287         if (!ok)
2288                 return((int)n);
2289
2290         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2291                 {
2292                 s->s3->tmp.reuse_message=1;
2293                 return(1);
2294                 }
2295         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2296                 {
2297                 al=SSL_AD_UNEXPECTED_MESSAGE;
2298                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2299                 goto f_err;
2300                 }
2301         if (n < 6)
2302                 {
2303                 /* need at least ticket_lifetime_hint + ticket length */
2304                 al = SSL_AD_DECODE_ERROR;
2305                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2306                 goto f_err;
2307                 }
2308
2309         p=d=(unsigned char *)s->init_msg;
2310         n2l(p, s->session->tlsext_tick_lifetime_hint);
2311         n2s(p, ticklen);
2312         /* ticket_lifetime_hint + ticket_length + ticket */
2313         if (ticklen + 6 != n)
2314                 {
2315                 al = SSL_AD_DECODE_ERROR;
2316                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2317                 goto f_err;
2318                 }
2319         if (s->session->tlsext_tick)
2320                 {
2321                 OPENSSL_free(s->session->tlsext_tick);
2322                 s->session->tlsext_ticklen = 0;
2323                 }
2324         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2325         if (!s->session->tlsext_tick)
2326                 {
2327                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2328                 goto err;
2329                 }
2330         memcpy(s->session->tlsext_tick, p, ticklen);
2331         s->session->tlsext_ticklen = ticklen;
2332         /* There are two ways to detect a resumed ticket session.
2333          * One is to set an appropriate session ID and then the server
2334          * must return a match in ServerHello. This allows the normal
2335          * client session ID matching to work and we know much
2336          * earlier that the ticket has been accepted.
2337          *
2338          * The other way is to set zero length session ID when the
2339          * ticket is presented and rely on the handshake to determine
2340          * session resumption.
2341          *
2342          * We choose the former approach because this fits in with
2343          * assumptions elsewhere in OpenSSL. The session ID is set
2344          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2345          * ticket.
2346          */
2347         EVP_Digest(p, ticklen,
2348                         s->session->session_id, &s->session->session_id_length,
2349 #ifndef OPENSSL_NO_SHA256
2350                                                         EVP_sha256(), NULL);
2351 #else
2352                                                         EVP_sha1(), NULL);
2353 #endif
2354         ret=1;
2355         return(ret);
2356 f_err:
2357         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2358 err:
2359         return(-1);
2360         }
2361
2362 int ssl3_get_cert_status(SSL *s)
2363         {
2364         int ok, al;
2365         unsigned long resplen,n;
2366         const unsigned char *p;
2367
2368         n=s->method->ssl_get_message(s,
2369                 SSL3_ST_CR_CERT_STATUS_A,
2370                 SSL3_ST_CR_CERT_STATUS_B,
2371                 SSL3_MT_CERTIFICATE_STATUS,
2372                 16384,
2373                 &ok);
2374
2375         if (!ok) return((int)n);
2376         if (n < 4)
2377                 {
2378                 /* need at least status type + length */
2379                 al = SSL_AD_DECODE_ERROR;
2380                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2381                 goto f_err;
2382                 }
2383         p = (unsigned char *)s->init_msg;
2384         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2385                 {
2386                 al = SSL_AD_DECODE_ERROR;
2387                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2388                 goto f_err;
2389                 }
2390         n2l3(p, resplen);
2391         if (resplen + 4 != n)
2392                 {
2393                 al = SSL_AD_DECODE_ERROR;
2394                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2395                 goto f_err;
2396                 }
2397         if (s->tlsext_ocsp_resp)
2398                 OPENSSL_free(s->tlsext_ocsp_resp);
2399         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2400         if (!s->tlsext_ocsp_resp)
2401                 {
2402                 al = SSL_AD_INTERNAL_ERROR;
2403                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2404                 goto f_err;
2405                 }
2406         s->tlsext_ocsp_resplen = resplen;
2407         if (s->ctx->tlsext_status_cb)
2408                 {
2409                 int ret;
2410                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2411                 if (ret == 0)
2412                         {
2413                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2414                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2415                         goto f_err;
2416                         }
2417                 if (ret < 0)
2418                         {
2419                         al = SSL_AD_INTERNAL_ERROR;
2420                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2421                         goto f_err;
2422                         }
2423                 }
2424         return 1;
2425 f_err:
2426         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2427         return(-1);
2428         }
2429 #endif
2430
2431 int ssl3_get_server_done(SSL *s)
2432         {
2433         int ok,ret=0;
2434         long n;
2435
2436         n=s->method->ssl_get_message(s,
2437                 SSL3_ST_CR_SRVR_DONE_A,
2438                 SSL3_ST_CR_SRVR_DONE_B,
2439                 SSL3_MT_SERVER_DONE,
2440                 30, /* should be very small, like 0 :-) */
2441                 &ok);
2442
2443         if (!ok) return((int)n);
2444         if (n > 0)
2445                 {
2446                 /* should contain no data */
2447                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2448                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2449                 return -1;
2450                 }
2451         ret=1;
2452         return(ret);
2453         }
2454
2455
2456 int ssl3_send_client_key_exchange(SSL *s)
2457         {
2458         unsigned char *p;
2459         int n;
2460         unsigned long alg_k;
2461 #ifndef OPENSSL_NO_RSA
2462         unsigned char *q;
2463         EVP_PKEY *pkey=NULL;
2464 #endif
2465 #ifndef OPENSSL_NO_KRB5
2466         KSSL_ERR kssl_err;
2467 #endif /* OPENSSL_NO_KRB5 */
2468 #ifndef OPENSSL_NO_ECDH
2469         EC_KEY *clnt_ecdh = NULL;
2470         const EC_POINT *srvr_ecpoint = NULL;
2471         EVP_PKEY *srvr_pub_pkey = NULL;
2472         unsigned char *encodedPoint = NULL;
2473         int encoded_pt_len = 0;
2474         BN_CTX * bn_ctx = NULL;
2475 #endif
2476
2477         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2478                 {
2479                 p = ssl_handshake_start(s);
2480
2481                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2482
2483                 /* Fool emacs indentation */
2484                 if (0) {}
2485 #ifndef OPENSSL_NO_RSA
2486                 else if (alg_k & SSL_kRSA)
2487                         {
2488                         RSA *rsa;
2489                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2490
2491                         if (s->session->sess_cert == NULL)
2492                                 {
2493                                 /* We should always have a server certificate with SSL_kRSA. */
2494                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2495                                 goto err;
2496                                 }
2497
2498                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2499                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2500                         else
2501                                 {
2502                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2503                                 if ((pkey == NULL) ||
2504                                         (pkey->type != EVP_PKEY_RSA) ||
2505                                         (pkey->pkey.rsa == NULL))
2506                                         {
2507                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2508                                         goto err;
2509                                         }
2510                                 rsa=pkey->pkey.rsa;
2511                                 EVP_PKEY_free(pkey);
2512                                 }
2513
2514                         tmp_buf[0]=s->client_version>>8;
2515                         tmp_buf[1]=s->client_version&0xff;
2516                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2517                                         goto err;
2518
2519                         s->session->master_key_length=sizeof tmp_buf;
2520
2521                         q=p;
2522                         /* Fix buf for TLS and beyond */
2523                         if (s->version > SSL3_VERSION)
2524                                 p+=2;
2525                         n=RSA_public_encrypt(sizeof tmp_buf,
2526                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2527 #ifdef PKCS1_CHECK
2528                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2529                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2530 #endif
2531                         if (n <= 0)
2532                                 {
2533                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2534                                 goto err;
2535                                 }
2536
2537                         /* Fix buf for TLS and beyond */
2538                         if (s->version > SSL3_VERSION)
2539                                 {
2540                                 s2n(n,q);
2541                                 n+=2;
2542                                 }
2543
2544                         s->session->master_key_length=
2545                                 s->method->ssl3_enc->generate_master_secret(s,
2546                                         s->session->master_key,
2547                                         tmp_buf,sizeof tmp_buf);
2548                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2549                         }
2550 #endif
2551 #ifndef OPENSSL_NO_KRB5
2552                 else if (alg_k & SSL_kKRB5)
2553                         {
2554                         krb5_error_code krb5rc;
2555                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2556                         /*  krb5_data   krb5_ap_req;  */
2557                         krb5_data       *enc_ticket;
2558                         krb5_data       authenticator, *authp = NULL;
2559                         EVP_CIPHER_CTX  ciph_ctx;
2560                         const EVP_CIPHER *enc = NULL;
2561                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2562                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2563                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2564                                                 + EVP_MAX_IV_LENGTH];
2565                         int             padl, outl = sizeof(epms);
2566
2567                         EVP_CIPHER_CTX_init(&ciph_ctx);
2568
2569 #ifdef KSSL_DEBUG
2570                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2571                                 alg_k, SSL_kKRB5);
2572 #endif  /* KSSL_DEBUG */
2573
2574                         authp = NULL;
2575 #ifdef KRB5SENDAUTH
2576                         if (KRB5SENDAUTH)  authp = &authenticator;
2577 #endif  /* KRB5SENDAUTH */
2578
2579                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2580                                 &kssl_err);
2581                         enc = kssl_map_enc(kssl_ctx->enctype);
2582                         if (enc == NULL)
2583                             goto err;
2584 #ifdef KSSL_DEBUG
2585                         {
2586                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2587                         if (krb5rc && kssl_err.text)
2588                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2589                         }
2590 #endif  /* KSSL_DEBUG */
2591
2592                         if (krb5rc)
2593                                 {
2594                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2595                                                 SSL_AD_HANDSHAKE_FAILURE);
2596                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2597                                                 kssl_err.reason);
2598                                 goto err;
2599                                 }
2600
2601                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2602                         **  in place of RFC 2712 KerberosWrapper, as in:
2603                         **
2604                         **  Send ticket (copy to *p, set n = length)
2605                         **  n = krb5_ap_req.length;
2606                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2607                         **  if (krb5_ap_req.data)
2608                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2609                         **
2610                         **  Now using real RFC 2712 KerberosWrapper
2611                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2612                         **  Note: 2712 "opaque" types are here replaced
2613                         **  with a 2-byte length followed by the value.
2614                         **  Example:
2615                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2616                         **  Where "xx xx" = length bytes.  Shown here with
2617                         **  optional authenticator omitted.
2618                         */
2619
2620                         /*  KerberosWrapper.Ticket              */
2621                         s2n(enc_ticket->length,p);
2622                         memcpy(p, enc_ticket->data, enc_ticket->length);
2623                         p+= enc_ticket->length;
2624                         n = enc_ticket->length + 2;
2625
2626                         /*  KerberosWrapper.Authenticator       */
2627                         if (authp  &&  authp->length)
2628                                 {
2629                                 s2n(authp->length,p);
2630                                 memcpy(p, authp->data, authp->length);
2631                                 p+= authp->length;
2632                                 n+= authp->length + 2;
2633
2634                                 free(authp->data);
2635                                 authp->data = NULL;
2636                                 authp->length = 0;
2637                                 }
2638                         else
2639                                 {
2640                                 s2n(0,p);/*  null authenticator length  */
2641                                 n+=2;
2642                                 }
2643
2644                             tmp_buf[0]=s->client_version>>8;
2645                             tmp_buf[1]=s->client_version&0xff;
2646                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2647                                 goto err;
2648
2649                         /*  20010420 VRS.  Tried it this way; failed.
2650                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2651                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2652                         **                              kssl_ctx->length);
2653                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2654                         */
2655
2656                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2657                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2658                                 kssl_ctx->key,iv);
2659                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2660                                 sizeof tmp_buf);
2661                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2662                         outl += padl;
2663                         if (outl > (int)sizeof epms)
2664                                 {
2665                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2666                                 goto err;
2667                                 }
2668                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2669
2670                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2671                         s2n(outl,p);
2672                         memcpy(p, epms, outl);
2673                         p+=outl;
2674                         n+=outl + 2;
2675
2676                         s->session->master_key_length=
2677                                 s->method->ssl3_enc->generate_master_secret(s,
2678                                         s->session->master_key,
2679                                         tmp_buf, sizeof tmp_buf);
2680
2681                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2682                         OPENSSL_cleanse(epms, outl);
2683                         }
2684 #endif
2685 #ifndef OPENSSL_NO_DH
2686                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2687                         {
2688                         DH *dh_srvr,*dh_clnt;
2689                         SESS_CERT *scert = s->session->sess_cert;
2690
2691                         if (scert == NULL)
2692                                 {
2693                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2694                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2695                                 goto err;
2696                                 }
2697
2698                         if (scert->peer_dh_tmp != NULL)
2699                                 dh_srvr=scert->peer_dh_tmp;
2700                         else
2701                                 {
2702                                 /* we get them from the cert */
2703                                 int idx = scert->peer_cert_type;
2704                                 EVP_PKEY *spkey = NULL;
2705                                 dh_srvr = NULL;
2706                                 if (idx >= 0)
2707                                         spkey = X509_get_pubkey(
2708                                                 scert->peer_pkeys[idx].x509);
2709                                 if (spkey)
2710                                         {
2711                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2712                                         EVP_PKEY_free(spkey);
2713                                         }
2714                                 if (dh_srvr == NULL)
2715                                         {
2716                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2717                                             ERR_R_INTERNAL_ERROR);
2718                                         goto err;
2719                                         }
2720                                 }
2721                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2722                                 {
2723                                 /* Use client certificate key */
2724                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2725                                 dh_clnt = NULL;
2726                                 if (clkey)
2727                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2728                                 if (dh_clnt == NULL)
2729                                         {
2730                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2731                                             ERR_R_INTERNAL_ERROR);
2732                                         goto err;
2733                                         }
2734                                 }
2735                         else
2736                                 {
2737                                 /* generate a new random key */
2738                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2739                                         {
2740                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2741                                         goto err;
2742                                         }
2743                                 if (!DH_generate_key(dh_clnt))
2744                                         {
2745                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2746                                         DH_free(dh_clnt);
2747                                         goto err;
2748                                         }
2749                                 }
2750
2751                         /* use the 'p' output buffer for the DH key, but
2752                          * make sure to clear it out afterwards */
2753
2754                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2755                         if (scert->peer_dh_tmp == NULL)
2756                                 DH_free(dh_srvr);
2757
2758                         if (n <= 0)
2759                                 {
2760                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2761                                 DH_free(dh_clnt);
2762                                 goto err;
2763                                 }
2764
2765                         /* generate master key from the result */
2766                         s->session->master_key_length=
2767                                 s->method->ssl3_enc->generate_master_secret(s,
2768                                         s->session->master_key,p,n);
2769                         /* clean up */
2770                         memset(p,0,n);
2771
2772                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2773                                 n = 0;
2774                         else
2775                                 {
2776                                 /* send off the data */
2777                                 n=BN_num_bytes(dh_clnt->pub_key);
2778                                 s2n(n,p);
2779                                 BN_bn2bin(dh_clnt->pub_key,p);
2780                                 n+=2;
2781                                 }
2782
2783                         DH_free(dh_clnt);
2784
2785                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2786                         }
2787 #endif
2788
2789 #ifndef OPENSSL_NO_ECDH
2790                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2791                         {
2792                         const EC_GROUP *srvr_group = NULL;
2793                         EC_KEY *tkey;
2794                         int ecdh_clnt_cert = 0;
2795                         int field_size = 0;
2796
2797                         if (s->session->sess_cert == NULL)
2798                                 {
2799                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2800                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2801                                 goto err;
2802                                 }
2803
2804                         /* Did we send out the client's
2805                          * ECDH share for use in premaster
2806                          * computation as part of client certificate?
2807                          * If so, set ecdh_clnt_cert to 1.
2808                          */
2809                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2810                                 {
2811                                 /* XXX: For now, we do not support client
2812                                  * authentication using ECDH certificates.
2813                                  * To add such support, one needs to add
2814                                  * code that checks for appropriate
2815                                  * conditions and sets ecdh_clnt_cert to 1.
2816                                  * For example, the cert have an ECC
2817                                  * key on the same curve as the server's
2818                                  * and the key should be authorized for
2819                                  * key agreement.
2820                                  *
2821                                  * One also needs to add code in ssl3_connect
2822                                  * to skip sending the certificate verify
2823                                  * message.
2824                                  *
2825                                  * if ((s->cert->key->privatekey != NULL) &&
2826                                  *     (s->cert->key->privatekey->type ==
2827                                  *      EVP_PKEY_EC) && ...)
2828                                  * ecdh_clnt_cert = 1;
2829                                  */
2830                                 }
2831
2832                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2833                                 {
2834                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2835                                 }
2836                         else
2837                                 {
2838                                 /* Get the Server Public Key from Cert */
2839                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2840                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2841                                 if ((srvr_pub_pkey == NULL) ||
2842                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2843                                     (srvr_pub_pkey->pkey.ec == NULL))
2844                                         {
2845                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2846                                             ERR_R_INTERNAL_ERROR);
2847                                         goto err;
2848                                         }
2849
2850                                 tkey = srvr_pub_pkey->pkey.ec;
2851                                 }
2852
2853                         srvr_group   = EC_KEY_get0_group(tkey);
2854                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2855
2856                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2857                                 {
2858                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2859                                     ERR_R_INTERNAL_ERROR);
2860                                 goto err;
2861                                 }
2862
2863                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2864                                 {
2865                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2866                                 goto err;
2867                                 }
2868
2869                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2870                                 {
2871                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2872                                 goto err;
2873                                 }
2874                         if (ecdh_clnt_cert)
2875                                 {
2876                                 /* Reuse key info from our certificate
2877                                  * We only need our private key to perform
2878                                  * the ECDH computation.
2879                                  */
2880                                 const BIGNUM *priv_key;
2881                                 tkey = s->cert->key->privatekey->pkey.ec;
2882                                 priv_key = EC_KEY_get0_private_key(tkey);
2883                                 if (priv_key == NULL)
2884                                         {
2885                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2886                                         goto err;
2887                                         }
2888                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2889                                         {
2890                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2891                                         goto err;
2892                                         }
2893                                 }
2894                         else
2895                                 {
2896                                 /* Generate a new ECDH key pair */
2897                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2898                                         {
2899                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2900                                         goto err;
2901                                         }
2902                                 }
2903
2904                         /* use the 'p' output buffer for the ECDH key, but
2905                          * make sure to clear it out afterwards
2906                          */
2907
2908                         field_size = EC_GROUP_get_degree(srvr_group);
2909                         if (field_size <= 0)
2910                                 {
2911                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2912                                        ERR_R_ECDH_LIB);
2913                                 goto err;
2914                                 }
2915                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2916                         if (n <= 0)
2917                                 {
2918                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2919                                        ERR_R_ECDH_LIB);
2920                                 goto err;
2921                                 }
2922
2923                         /* generate master key from the result */
2924                         s->session->master_key_length = s->method->ssl3_enc \
2925                             -> generate_master_secret(s,
2926                                 s->session->master_key,
2927                                 p, n);
2928
2929                         memset(p, 0, n); /* clean up */
2930
2931                         if (ecdh_clnt_cert)
2932                                 {
2933                                 /* Send empty client key exch message */
2934                                 n = 0;
2935                                 }
2936                         else
2937                                 {
2938                                 /* First check the size of encoding and
2939                                  * allocate memory accordingly.
2940                                  */
2941                                 encoded_pt_len =
2942                                     EC_POINT_point2oct(srvr_group,
2943                                         EC_KEY_get0_public_key(clnt_ecdh),
2944                                         POINT_CONVERSION_UNCOMPRESSED,
2945                                         NULL, 0, NULL);
2946
2947                                 encodedPoint = (unsigned char *)
2948                                     OPENSSL_malloc(encoded_pt_len *
2949                                         sizeof(unsigned char));
2950                                 bn_ctx = BN_CTX_new();
2951                                 if ((encodedPoint == NULL) ||
2952                                     (bn_ctx == NULL))
2953                                         {
2954                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2955                                         goto err;
2956                                         }
2957
2958                                 /* Encode the public key */
2959                                 n = EC_POINT_point2oct(srvr_group,
2960                                     EC_KEY_get0_public_key(clnt_ecdh),
2961                                     POINT_CONVERSION_UNCOMPRESSED,
2962                                     encodedPoint, encoded_pt_len, bn_ctx);
2963
2964                                 *p = n; /* length of encoded point */
2965                                 /* Encoded point will be copied here */
2966                                 p += 1;
2967                                 /* copy the point */
2968                                 memcpy((unsigned char *)p, encodedPoint, n);
2969                                 /* increment n to account for length field */
2970                                 n += 1;
2971                                 }
2972
2973                         /* Free allocated memory */
2974                         BN_CTX_free(bn_ctx);
2975                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2976                         if (clnt_ecdh != NULL)
2977                                  EC_KEY_free(clnt_ecdh);
2978                         EVP_PKEY_free(srvr_pub_pkey);
2979                         }
2980 #endif /* !OPENSSL_NO_ECDH */
2981                 else if (alg_k & SSL_kGOST)
2982                         {
2983                         /* GOST key exchange message creation */
2984                         EVP_PKEY_CTX *pkey_ctx;
2985                         X509 *peer_cert;
2986                         size_t msglen;
2987                         unsigned int md_len;
2988                         int keytype;
2989                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2990                         EVP_MD_CTX *ukm_hash;
2991                         EVP_PKEY *pub_key;
2992
2993                         /* Get server sertificate PKEY and create ctx from it */
2994                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2995                         if (!peer_cert)
2996                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2997                         if (!peer_cert)         {
2998                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2999                                         goto err;
3000                                 }
3001
3002                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
3003                         /* If we have send a certificate, and certificate key
3004
3005                          * parameters match those of server certificate, use
3006                          * certificate key for key exchange
3007                          */
3008
3009                          /* Otherwise, generate ephemeral key pair */
3010
3011                         EVP_PKEY_encrypt_init(pkey_ctx);
3012                           /* Generate session key */
3013                     RAND_bytes(premaster_secret,32);
3014                         /* If we have client certificate, use its secret as peer key */
3015                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3016                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3017                                         /* If there was an error - just ignore it. Ephemeral key
3018                                         * would be used
3019                                         */
3020                                         ERR_clear_error();
3021                                 }
3022                         }
3023                         /* Compute shared IV and store it in algorithm-specific
3024                          * context data */
3025                         ukm_hash = EVP_MD_CTX_create();
3026                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3027                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3028                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3029                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3030                         EVP_MD_CTX_destroy(ukm_hash);
3031                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3032                                 8,shared_ukm)<0) {
3033                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3034                                                 SSL_R_LIBRARY_BUG);
3035                                         goto err;
3036                                 }
3037                         /* Make GOST keytransport blob message */
3038                         /*Encapsulate it into sequence */
3039                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3040                         msglen=255;
3041                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3042                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3043                                         SSL_R_LIBRARY_BUG);
3044                                 goto err;
3045                         }
3046                         if (msglen >= 0x80)
3047                                 {
3048                                 *(p++)=0x81;
3049                                 *(p++)= msglen & 0xff;
3050                                 n=msglen+3;
3051                                 }
3052                         else
3053                                 {
3054                                 *(p++)= msglen & 0xff;
3055                                 n=msglen+2;
3056                                 }
3057                         memcpy(p, tmp, msglen);
3058                         /* Check if pubkey from client certificate was used */
3059                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3060                                 {
3061                                 /* Set flag "skip certificate verify" */
3062                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3063                                 }
3064                         EVP_PKEY_CTX_free(pkey_ctx);
3065                         s->session->master_key_length=
3066                                 s->method->ssl3_enc->generate_master_secret(s,
3067                                         s->session->master_key,premaster_secret,32);
3068                         EVP_PKEY_free(pub_key);
3069
3070                         }
3071 #ifndef OPENSSL_NO_SRP
3072                 else if (alg_k & SSL_kSRP)
3073                         {
3074                         if (s->srp_ctx.A != NULL)
3075                                 {
3076                                 /* send off the data */
3077                                 n=BN_num_bytes(s->srp_ctx.A);
3078                                 s2n(n,p);
3079                                 BN_bn2bin(s->srp_ctx.A,p);
3080                                 n+=2;
3081                                 }
3082                         else
3083                                 {
3084                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3085                                 goto err;
3086                                 }
3087                         if (s->session->srp_username != NULL)
3088                                 OPENSSL_free(s->session->srp_username);
3089                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3090                         if (s->session->srp_username == NULL)
3091                                 {
3092                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3093                                         ERR_R_MALLOC_FAILURE);
3094                                 goto err;
3095                                 }
3096
3097                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3098                                 {
3099                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3100                                 goto err;
3101                                 }
3102                         }
3103 #endif
3104 #ifndef OPENSSL_NO_PSK
3105                 else if (alg_k & SSL_kPSK)
3106                         {
3107                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3108                          * to return a \0-terminated identity. The last byte
3109                          * is for us for simulating strnlen. */
3110                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3111                         size_t identity_len;
3112                         unsigned char *t = NULL;
3113                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3114                         unsigned int pre_ms_len = 0, psk_len = 0;
3115                         int psk_err = 1;
3116
3117                         n = 0;
3118                         if (s->psk_client_callback == NULL)
3119                                 {
3120                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3121                                         SSL_R_PSK_NO_CLIENT_CB);
3122                                 goto err;
3123                                 }
3124
3125                         memset(identity, 0, sizeof(identity));
3126                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3127                                 identity, sizeof(identity) - 1,
3128                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3129                         if (psk_len > PSK_MAX_PSK_LEN)
3130                                 {
3131                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3132                                         ERR_R_INTERNAL_ERROR);
3133                                 goto psk_err;
3134                                 }
3135                         else if (psk_len == 0)
3136                                 {
3137                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3138                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3139                                 goto psk_err;
3140                                 }
3141                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3142                         identity_len = strlen(identity);
3143                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3144                                 {
3145                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3146                                         ERR_R_INTERNAL_ERROR);
3147                                 goto psk_err;
3148                                 }
3149                         /* create PSK pre_master_secret */
3150                         pre_ms_len = 2+psk_len+2+psk_len;
3151                         t = psk_or_pre_ms;
3152                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3153                         s2n(psk_len, t);
3154                         memset(t, 0, psk_len);
3155                         t+=psk_len;
3156                         s2n(psk_len, t);
3157
3158                         if (s->session->psk_identity_hint != NULL)
3159                                 OPENSSL_free(s->session->psk_identity_hint);
3160                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3161                         if (s->ctx->psk_identity_hint != NULL &&
3162                                 s->session->psk_identity_hint == NULL)
3163                                 {
3164                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3165                                         ERR_R_MALLOC_FAILURE);
3166                                 goto psk_err;
3167                                 }
3168
3169                         if (s->session->psk_identity != NULL)
3170                                 OPENSSL_free(s->session->psk_identity);
3171                         s->session->psk_identity = BUF_strdup(identity);
3172                         if (s->session->psk_identity == NULL)
3173                                 {
3174                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3175                                         ERR_R_MALLOC_FAILURE);
3176                                 goto psk_err;
3177                                 }
3178
3179                         s->session->master_key_length =
3180                                 s->method->ssl3_enc->generate_master_secret(s,
3181                                         s->session->master_key,
3182                                         psk_or_pre_ms, pre_ms_len);
3183                         s2n(identity_len, p);
3184                         memcpy(p, identity, identity_len);
3185                         n = 2 + identity_len;
3186                         psk_err = 0;
3187                 psk_err:
3188                         OPENSSL_cleanse(identity, sizeof(identity));
3189                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3190                         if (psk_err != 0)
3191                                 {
3192                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3193                                 goto err;
3194                                 }
3195                         }
3196 #endif
3197                 else
3198                         {
3199                         ssl3_send_alert(s, SSL3_AL_FATAL,
3200                             SSL_AD_HANDSHAKE_FAILURE);
3201                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3202                             ERR_R_INTERNAL_ERROR);
3203                         goto err;
3204                         }
3205
3206                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3207                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3208                 }
3209
3210         /* SSL3_ST_CW_KEY_EXCH_B */
3211         return ssl_do_write(s);
3212 err:
3213 #ifndef OPENSSL_NO_ECDH
3214         BN_CTX_free(bn_ctx);
3215         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3216         if (clnt_ecdh != NULL)
3217                 EC_KEY_free(clnt_ecdh);
3218         EVP_PKEY_free(srvr_pub_pkey);
3219 #endif
3220         return(-1);
3221         }
3222
3223 int ssl3_send_client_verify(SSL *s)
3224         {
3225         unsigned char *p;
3226         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3227         EVP_PKEY *pkey;
3228         EVP_PKEY_CTX *pctx=NULL;
3229         EVP_MD_CTX mctx;
3230         unsigned u=0;
3231         unsigned long n;
3232         int j;
3233
3234         EVP_MD_CTX_init(&mctx);
3235
3236         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3237                 {
3238                 p= ssl_handshake_start(s);
3239                 pkey=s->cert->key->privatekey;
3240 /* Create context from key and test if sha1 is allowed as digest */
3241                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3242                 EVP_PKEY_sign_init(pctx);
3243                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3244                         {
3245                         if (!SSL_USE_SIGALGS(s))
3246                                 s->method->ssl3_enc->cert_verify_mac(s,
3247                                                 NID_sha1,
3248                                                 &(data[MD5_DIGEST_LENGTH]));
3249                         }
3250                 else
3251                         {
3252                         ERR_clear_error();
3253                         }
3254                 /* For TLS v1.2 send signature algorithm and signature
3255                  * using agreed digest and cached handshake records.
3256                  */
3257                 if (SSL_USE_SIGALGS(s))
3258                         {
3259                         long hdatalen = 0;
3260                         void *hdata;
3261                         const EVP_MD *md = s->cert->key->digest;
3262                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3263                                                                 &hdata);
3264                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3265                                 {
3266                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3267                                                 ERR_R_INTERNAL_ERROR);
3268                                 goto err;
3269                                 }
3270                         p += 2;
3271 #ifdef SSL_DEBUG
3272                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3273                                                         EVP_MD_name(md));
3274 #endif
3275                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3276                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3277                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3278                                 {
3279                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3280                                                 ERR_R_EVP_LIB);
3281                                 goto err;
3282                                 }
3283                         s2n(u,p);
3284                         n = u + 4;
3285                         if (!ssl3_digest_cached_records(s))
3286                                 goto err;
3287                         }
3288                 else
3289 #ifndef OPENSSL_NO_RSA
3290                 if (pkey->type == EVP_PKEY_RSA)
3291                         {
3292                         s->method->ssl3_enc->cert_verify_mac(s,
3293                                 NID_md5,
3294                                 &(data[0]));
3295                         if (RSA_sign(NID_md5_sha1, data,
3296                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3297                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3298                                 {
3299                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3300                                 goto err;
3301                                 }
3302                         s2n(u,p);
3303                         n=u+2;
3304                         }
3305                 else
3306 #endif
3307 #ifndef OPENSSL_NO_DSA
3308                         if (pkey->type == EVP_PKEY_DSA)
3309                         {
3310                         if (!DSA_sign(pkey->save_type,
3311                                 &(data[MD5_DIGEST_LENGTH]),
3312                                 SHA_DIGEST_LENGTH,&(p[2]),
3313                                 (unsigned int *)&j,pkey->pkey.dsa))
3314                                 {
3315                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3316                                 goto err;
3317                                 }
3318                         s2n(j,p);
3319                         n=j+2;
3320                         }
3321                 else
3322 #endif
3323 #ifndef OPENSSL_NO_ECDSA
3324                         if (pkey->type == EVP_PKEY_EC)
3325                         {
3326                         if (!ECDSA_sign(pkey->save_type,
3327                                 &(data[MD5_DIGEST_LENGTH]),
3328                                 SHA_DIGEST_LENGTH,&(p[2]),
3329                                 (unsigned int *)&j,pkey->pkey.ec))
3330                                 {
3331                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3332                                     ERR_R_ECDSA_LIB);
3333                                 goto err;
3334                                 }
3335                         s2n(j,p);
3336                         n=j+2;
3337                         }
3338                 else
3339 #endif
3340                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3341                 {
3342                 unsigned char signbuf[64];
3343                 int i;
3344                 size_t sigsize=64;
3345                 s->method->ssl3_enc->cert_verify_mac(s,
3346                         NID_id_GostR3411_94,
3347                         data);
3348                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3349                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3350                         ERR_R_INTERNAL_ERROR);
3351                         goto err;
3352                 }
3353                 for (i=63,j=0; i>=0; j++, i--) {
3354                         p[2+j]=signbuf[i];
3355                 }
3356                 s2n(j,p);
3357                 n=j+2;
3358                 }
3359                 else
3360                 {
3361                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3362                         goto err;
3363                 }
3364                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3365                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3366                 }
3367         EVP_MD_CTX_cleanup(&mctx);
3368         EVP_PKEY_CTX_free(pctx);
3369         return ssl_do_write(s);
3370 err:
3371         EVP_MD_CTX_cleanup(&mctx);
3372         EVP_PKEY_CTX_free(pctx);
3373         return(-1);
3374         }
3375
3376 /* Check a certificate can be used for client authentication. Currently
3377  * check cert exists, if we have a suitable digest for TLS 1.2 if
3378  * static DH client certificates can be used and optionally checks
3379  * suitability for Suite B.
3380  */
3381 static int ssl3_check_client_certificate(SSL *s)
3382         {
3383         unsigned long alg_k;
3384         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3385                 return 0;
3386         /* If no suitable signature algorithm can't use certificate */
3387         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3388                 return 0;
3389         /* If strict mode check suitability of chain before using it.
3390          * This also adjusts suite B digest if necessary.
3391          */
3392         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3393                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3394                 return 0;
3395         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3396         /* See if we can use client certificate for fixed DH */
3397         if (alg_k & (SSL_kDHr|SSL_kDHd))
3398                 {
3399                 SESS_CERT *scert = s->session->sess_cert;
3400                 int i = scert->peer_cert_type;
3401                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3402                 clkey = s->cert->key->privatekey;
3403                 /* If client key not DH assume it can be used */
3404                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3405                         return 1;
3406                 if (i >= 0)
3407                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3408                 if (spkey)
3409                         {
3410                         /* Compare server and client parameters */
3411                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3412                         EVP_PKEY_free(spkey);
3413                         if (i != 1)
3414                                 return 0;
3415                         }
3416                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3417                 }
3418         return 1;
3419         }
3420
3421 int ssl3_send_client_certificate(SSL *s)
3422         {
3423         X509 *x509=NULL;
3424         EVP_PKEY *pkey=NULL;
3425         int i;
3426
3427         if (s->state == SSL3_ST_CW_CERT_A)
3428                 {
3429                 /* Let cert callback update client certificates if required */
3430                 if (s->cert->cert_cb)
3431                         {
3432                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3433                         if (i < 0)
3434                                 {
3435                                 s->rwstate=SSL_X509_LOOKUP;
3436                                 return -1;
3437                                 }
3438                         if (i == 0)
3439                                 {
3440                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3441                                 return 0;
3442                                 }
3443                         s->rwstate=SSL_NOTHING;
3444                         }
3445                 if (ssl3_check_client_certificate(s))
3446                         s->state=SSL3_ST_CW_CERT_C;
3447                 else
3448                         s->state=SSL3_ST_CW_CERT_B;
3449                 }
3450
3451         /* We need to get a client cert */
3452         if (s->state == SSL3_ST_CW_CERT_B)
3453                 {
3454                 /* If we get an error, we need to
3455                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3456                  * We then get retied later */
3457                 i=0;
3458                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3459                 if (i < 0)
3460                         {
3461                         s->rwstate=SSL_X509_LOOKUP;
3462                         return(-1);
3463                         }
3464                 s->rwstate=SSL_NOTHING;
3465                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3466                         {
3467                         s->state=SSL3_ST_CW_CERT_B;
3468                         if (    !SSL_use_certificate(s,x509) ||
3469                                 !SSL_use_PrivateKey(s,pkey))
3470                                 i=0;
3471                         }
3472                 else if (i == 1)
3473                         {
3474                         i=0;
3475                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3476                         }
3477
3478                 if (x509 != NULL) X509_free(x509);
3479                 if (pkey != NULL) EVP_PKEY_free(pkey);
3480                 if (i && !ssl3_check_client_certificate(s))
3481                         i = 0;
3482                 if (i == 0)
3483                         {
3484                         if (s->version == SSL3_VERSION)
3485                                 {
3486                                 s->s3->tmp.cert_req=0;
3487                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3488                                 return(1);
3489                                 }
3490                         else
3491                                 {
3492                                 s->s3->tmp.cert_req=2;
3493                                 }
3494                         }
3495
3496                 /* Ok, we have a cert */
3497                 s->state=SSL3_ST_CW_CERT_C;
3498                 }
3499
3500         if (s->state == SSL3_ST_CW_CERT_C)
3501                 {
3502                 s->state=SSL3_ST_CW_CERT_D;
3503                 ssl3_output_cert_chain(s,
3504                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3505                 }
3506         /* SSL3_ST_CW_CERT_D */
3507         return ssl_do_write(s);
3508         }
3509
3510 #define has_bits(i,m)   (((i)&(m)) == (m))
3511
3512 int ssl3_check_cert_and_algorithm(SSL *s)
3513         {
3514         int i,idx;
3515         long alg_k,alg_a;
3516         EVP_PKEY *pkey=NULL;
3517         SESS_CERT *sc;
3518 #ifndef OPENSSL_NO_RSA
3519         RSA *rsa;
3520 #endif
3521 #ifndef OPENSSL_NO_DH
3522         DH *dh;
3523 #endif
3524
3525         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3526         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3527
3528         /* we don't have a certificate */
3529         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3530                 return(1);
3531
3532         sc=s->session->sess_cert;
3533         if (sc == NULL)
3534                 {
3535                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3536                 goto err;
3537                 }
3538
3539 #ifndef OPENSSL_NO_RSA
3540         rsa=s->session->sess_cert->peer_rsa_tmp;
3541 #endif
3542 #ifndef OPENSSL_NO_DH
3543         dh=s->session->sess_cert->peer_dh_tmp;
3544 #endif
3545
3546         /* This is the passed certificate */
3547
3548         idx=sc->peer_cert_type;
3549 #ifndef OPENSSL_NO_ECDH
3550         if (idx == SSL_PKEY_ECC)
3551                 {
3552                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3553                                                                 s) == 0)
3554                         { /* check failed */
3555                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3556                         goto f_err;
3557                         }
3558                 else
3559                         {
3560                         return 1;
3561                         }
3562                 }
3563         else if (alg_a & SSL_aECDSA)
3564                 {
3565                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3566                 goto f_err;
3567                 }
3568         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3569                 {
3570                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3571                 goto f_err;
3572                 }
3573 #endif
3574         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3575         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3576         EVP_PKEY_free(pkey);
3577
3578
3579         /* Check that we have a certificate if we require one */
3580         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3581                 {
3582                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3583                 goto f_err;
3584                 }
3585 #ifndef OPENSSL_NO_DSA
3586         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3587                 {
3588                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3589                 goto f_err;
3590                 }
3591 #endif
3592 #ifndef OPENSSL_NO_RSA
3593         if ((alg_k & SSL_kRSA) &&
3594                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3595                 {
3596                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3597                 goto f_err;
3598                 }
3599 #endif
3600 #ifndef OPENSSL_NO_DH
3601         if ((alg_k & SSL_kEDH) &&
3602                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3603                 {
3604                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3605                 goto f_err;
3606                 }
3607         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3608                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3609                 {
3610                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3611                 goto f_err;
3612                 }
3613 #ifndef OPENSSL_NO_DSA
3614         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3615                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3616                 {
3617                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3618                 goto f_err;
3619                 }
3620 #endif
3621 #endif
3622
3623         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3624                 {
3625 #ifndef OPENSSL_NO_RSA
3626                 if (alg_k & SSL_kRSA)
3627                         {
3628                         if (rsa == NULL
3629                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3630                                 {
3631                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3632                                 goto f_err;
3633                                 }
3634                         }
3635                 else
3636 #endif
3637 #ifndef OPENSSL_NO_DH
3638                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3639                             {
3640                             if (dh == NULL
3641                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3642                                 {
3643                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3644                                 goto f_err;
3645                                 }
3646                         }
3647                 else
3648 #endif
3649                         {
3650                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3651                         goto f_err;
3652                         }
3653                 }
3654         return(1);
3655 f_err:
3656         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3657 err:
3658         return(0);
3659         }
3660
3661 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3662 int ssl3_send_next_proto(SSL *s)
3663         {
3664         unsigned int len, padding_len;
3665         unsigned char *d;
3666
3667         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3668                 {
3669                 len = s->next_proto_negotiated_len;
3670                 padding_len = 32 - ((len + 2) % 32);
3671                 d = (unsigned char *)s->init_buf->data;
3672                 d[4] = len;
3673                 memcpy(d + 5, s->next_proto_negotiated, len);
3674                 d[5 + len] = padding_len;
3675                 memset(d + 6 + len, 0, padding_len);
3676                 *(d++)=SSL3_MT_NEXT_PROTO;
3677                 l2n3(2 + len + padding_len, d);
3678                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3679                 s->init_num = 4 + 2 + len + padding_len;
3680                 s->init_off = 0;
3681                 }
3682
3683         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3684 }
3685 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3686
3687 /* Check to see if handshake is full or resumed. Usually this is just a
3688  * case of checking to see if a cache hit has occurred. In the case of
3689  * session tickets we have to check the next message to be sure.
3690  */
3691
3692 #ifndef OPENSSL_NO_TLSEXT
3693 int ssl3_check_finished(SSL *s)
3694         {
3695         int ok;
3696         long n;
3697
3698         /* If we have no ticket it cannot be a resumed session. */
3699         if (!s->session->tlsext_tick)
3700                 return 1;
3701         /* this function is called when we really expect a Certificate
3702          * message, so permit appropriate message length */
3703         n=s->method->ssl_get_message(s,
3704                 SSL3_ST_CR_CERT_A,
3705                 SSL3_ST_CR_CERT_B,
3706                 -1,
3707                 s->max_cert_list,
3708                 &ok);
3709         if (!ok) return((int)n);
3710         s->s3->tmp.reuse_message = 1;
3711
3712         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3713                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3714                 return 2;
3715
3716         return 1;
3717         }
3718 #endif
3719
3720 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3721         {
3722         int i = 0;
3723 #ifndef OPENSSL_NO_ENGINE
3724         if (s->ctx->client_cert_engine)
3725                 {
3726                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3727                                                 SSL_get_client_CA_list(s),
3728                                                 px509, ppkey, NULL, NULL, NULL);
3729                 if (i != 0)
3730                         return i;
3731                 }
3732 #endif
3733         if (s->ctx->client_cert_cb)
3734                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3735         return i;
3736         }
3737