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 #ifndef OPENSSL_NO_TLSEXT
 230                         /*
 231                          * If renegotiating, the server may choose to not issue
 232                          * a new ticket, so reset the flag. It will be set to
 233                          * the right value when parsing ServerHello extensions.
 234                          */
 235                         s->tlsext_ticket_expected = 0;
 236 #endif
 237                         /* break */
 238                 case SSL_ST_BEFORE:
 239                 case SSL_ST_CONNECT:
 240                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 241                 case SSL_ST_OK|SSL_ST_CONNECT:
 242
 243                         s->server=0;
 244                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 245
 246                         if ((s->version & 0xff00 ) != 0x0300)
 247                                 {
 248                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 249                                 ret = -1;
 250                                 goto end;
 251                                 }
 252
 253                         /* s->version=SSL3_VERSION; */
 254                         s->type=SSL_ST_CONNECT;
 255
 256                         if (s->init_buf == NULL)
 257                                 {
 258                                 if ((buf=BUF_MEM_new()) == NULL)
 259                                         {
 260                                         ret= -1;
 261                                         goto end;
 262                                         }
 263                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 264                                         {
 265                                         ret= -1;
 266                                         goto end;
 267                                         }
 268                                 s->init_buf=buf;
 269                                 buf=NULL;
 270                                 }
 271
 272                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 273
 274                         /* setup buffing BIO */
 275                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 276
 277                         /* don't push the buffering BIO quite yet */
 278
 279                         ssl3_init_finished_mac(s);
 280
 281                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 282                         s->ctx->stats.sess_connect++;
 283                         s->init_num=0;
 284                         break;
 285
 286                 case SSL3_ST_CW_CLNT_HELLO_A:
 287                 case SSL3_ST_CW_CLNT_HELLO_B:
 288
 289                         s->shutdown=0;
 290                         ret=ssl3_client_hello(s);
 291                         if (ret <= 0) goto end;
 292                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 293                         s->init_num=0;
 294
 295                         /* turn on buffering for the next lot of output */
 296                         if (s->bbio != s->wbio)
 297                                 s->wbio=BIO_push(s->bbio,s->wbio);
 298
 299                         break;
 300
 301                 case SSL3_ST_CR_SRVR_HELLO_A:
 302                 case SSL3_ST_CR_SRVR_HELLO_B:
 303                         ret=ssl3_get_server_hello(s);
 304                         if (ret <= 0) goto end;
 305
 306                         if (s->hit)
 307                                 {
 308                                 s->state=SSL3_ST_CR_FINISHED_A;
 309 #ifndef OPENSSL_NO_TLSEXT
 310                                 if (s->tlsext_ticket_expected)
 311                                         {
 312                                         /* receive renewed session ticket */
 313                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 314                                         }
 315 #endif
 316                                 }
 317                         else
 318                                 {
 319                                         s->state=SSL3_ST_CR_CERT_A;
 320                                 }
 321                         s->init_num=0;
 322                         break;
 323                 case SSL3_ST_CR_CERT_A:
 324                 case SSL3_ST_CR_CERT_B:
 325 #ifndef OPENSSL_NO_TLSEXT
 326                         ret=ssl3_check_finished(s);
 327                         if (ret <= 0) goto end;
 328                         if (ret == 2)
 329                                 {
 330                                 s->hit = 1;
 331                                 if (s->tlsext_ticket_expected)
 332                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 333                                 else
 334                                         s->state=SSL3_ST_CR_FINISHED_A;
 335                                 s->init_num=0;
 336                                 break;
 337                                 }
 338 #endif
 339                         /* Check if it is anon DH/ECDH, SRP auth */
 340                         /* or PSK */
 341                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 342                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 343                                 {
 344                                 ret=ssl3_get_server_certificate(s);
 345                                 if (ret <= 0) goto end;
 346 #ifndef OPENSSL_NO_TLSEXT
 347                                 if (s->tlsext_status_expected)
 348                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 349                                 else
 350                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 351                                 }
 352                         else
 353                                 {
 354                                 skip = 1;
 355                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 356                                 }
 357 #else
 358                                 }
 359                         else
 360                                 skip=1;
 361
 362                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 363 #endif
 364                         s->init_num=0;
 365                         break;
 366
 367                 case SSL3_ST_CR_KEY_EXCH_A:
 368                 case SSL3_ST_CR_KEY_EXCH_B:
 369                         ret=ssl3_get_key_exchange(s);
 370                         if (ret <= 0) goto end;
 371                         s->state=SSL3_ST_CR_CERT_REQ_A;
 372                         s->init_num=0;
 373
 374                         /* at this point we check that we have the
 375                          * required stuff from the server */
 376                         if (!ssl3_check_cert_and_algorithm(s))
 377                                 {
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381                         break;
 382
 383                 case SSL3_ST_CR_CERT_REQ_A:
 384                 case SSL3_ST_CR_CERT_REQ_B:
 385                         ret=ssl3_get_certificate_request(s);
 386                         if (ret <= 0) goto end;
 387                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 388                         s->init_num=0;
 389                         break;
 390
 391                 case SSL3_ST_CR_SRVR_DONE_A:
 392                 case SSL3_ST_CR_SRVR_DONE_B:
 393                         ret=ssl3_get_server_done(s);
 394                         if (ret <= 0) goto end;
 395 #ifndef OPENSSL_NO_SRP
 396                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 397                                 {
 398                                 if ((ret = SRP_Calc_A_param(s))<=0)
 399                                         {
 400                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 401                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 402                                         goto end;
 403                                         }
 404                                 }
 405 #endif
 406                         if (s->s3->tmp.cert_req)
 407                                 s->state=SSL3_ST_CW_CERT_A;
 408                         else
 409                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 410                         s->init_num=0;
 411
 412                         break;
 413
 414                 case SSL3_ST_CW_CERT_A:
 415                 case SSL3_ST_CW_CERT_B:
 416                 case SSL3_ST_CW_CERT_C:
 417                 case SSL3_ST_CW_CERT_D:
 418                         ret=ssl3_send_client_certificate(s);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 421                         s->init_num=0;
 422                         break;
 423
 424                 case SSL3_ST_CW_KEY_EXCH_A:
 425                 case SSL3_ST_CW_KEY_EXCH_B:
 426                         ret=ssl3_send_client_key_exchange(s);
 427                         if (ret <= 0) goto end;
 428                         /* EAY EAY EAY need to check for DH fix cert
 429                          * sent back */
 430                         /* For TLS, cert_req is set to 2, so a cert chain
 431                          * of nothing is sent, but no verify packet is sent */
 432                         /* XXX: For now, we do not support client
 433                          * authentication in ECDH cipher suites with
 434                          * ECDH (rather than ECDSA) certificates.
 435                          * We need to skip the certificate verify
 436                          * message when client's ECDH public key is sent
 437                          * inside the client certificate.
 438                          */
 439                         if (s->s3->tmp.cert_req == 1)
 440                                 {
 441                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 442                                 }
 443                         else
 444                                 {
 445                                 s->state=SSL3_ST_CW_CHANGE_A;
 446                                 s->s3->change_cipher_spec=0;
 447                                 }
 448                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 449                                 {
 450                                 s->state=SSL3_ST_CW_CHANGE_A;
 451                                 s->s3->change_cipher_spec=0;
 452                                 }
 453
 454                         s->init_num=0;
 455                         break;
 456
 457                 case SSL3_ST_CW_CERT_VRFY_A:
 458                 case SSL3_ST_CW_CERT_VRFY_B:
 459                         ret=ssl3_send_client_verify(s);
 460                         if (ret <= 0) goto end;
 461                         s->state=SSL3_ST_CW_CHANGE_A;
 462                         s->init_num=0;
 463                         s->s3->change_cipher_spec=0;
 464                         break;
 465
 466                 case SSL3_ST_CW_CHANGE_A:
 467                 case SSL3_ST_CW_CHANGE_B:
 468                         ret=ssl3_send_change_cipher_spec(s,
 469                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 470                         if (ret <= 0) goto end;
 471
 472 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 473                         s->state=SSL3_ST_CW_FINISHED_A;
 474 #else
 475                         if (s->s3->next_proto_neg_seen)
 476                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 477                         else
 478                                 s->state=SSL3_ST_CW_FINISHED_A;
 479 #endif
 480                         s->init_num=0;
 481
 482                         s->session->cipher=s->s3->tmp.new_cipher;
 483 #ifdef OPENSSL_NO_COMP
 484                         s->session->compress_meth=0;
 485 #else
 486                         if (s->s3->tmp.new_compression == NULL)
 487                                 s->session->compress_meth=0;
 488                         else
 489                                 s->session->compress_meth=
 490                                         s->s3->tmp.new_compression->id;
 491 #endif
 492                         if (!s->method->ssl3_enc->setup_key_block(s))
 493                                 {
 494                                 ret= -1;
 495                                 goto end;
 496                                 }
 497
 498                         if (!s->method->ssl3_enc->change_cipher_state(s,
 499                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 500                                 {
 501                                 ret= -1;
 502                                 goto end;
 503                                 }
 504
 505                         break;
 506
 507 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 508                 case SSL3_ST_CW_NEXT_PROTO_A:
 509                 case SSL3_ST_CW_NEXT_PROTO_B:
 510                         ret=ssl3_send_next_proto(s);
 511                         if (ret <= 0) goto end;
 512                         s->state=SSL3_ST_CW_FINISHED_A;
 513                         break;
 514 #endif
 515
 516                 case SSL3_ST_CW_FINISHED_A:
 517                 case SSL3_ST_CW_FINISHED_B:
 518                         ret=ssl3_send_finished(s,
 519                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 520                                 s->method->ssl3_enc->client_finished_label,
 521                                 s->method->ssl3_enc->client_finished_label_len);
 522                         if (ret <= 0) goto end;
 523                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 524                         s->state=SSL3_ST_CW_FLUSH;
 525
 526                         /* clear flags */
 527                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 528                         if (s->hit)
 529                                 {
 530                                 s->s3->tmp.next_state=SSL_ST_OK;
 531                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 532                                         {
 533                                         s->state=SSL_ST_OK;
 534                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 535                                         s->s3->delay_buf_pop_ret=0;
 536                                         }
 537                                 }
 538                         else
 539                                 {
 540 #ifndef OPENSSL_NO_TLSEXT
 541                                 /* Allow NewSessionTicket if ticket expected */
 542                                 if (s->tlsext_ticket_expected)
 543                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 544                                 else
 545 #endif
 546
 547                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 548                                 }
 549                         s->init_num=0;
 550                         break;
 551
 552 #ifndef OPENSSL_NO_TLSEXT
 553                 case SSL3_ST_CR_SESSION_TICKET_A:
 554                 case SSL3_ST_CR_SESSION_TICKET_B:
 555                         ret=ssl3_get_new_session_ticket(s);
 556                         if (ret <= 0) goto end;
 557                         s->state=SSL3_ST_CR_FINISHED_A;
 558                         s->init_num=0;
 559                 break;
 560
 561                 case SSL3_ST_CR_CERT_STATUS_A:
 562                 case SSL3_ST_CR_CERT_STATUS_B:
 563                         ret=ssl3_get_cert_status(s);
 564                         if (ret <= 0) goto end;
 565                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 566                         s->init_num=0;
 567                 break;
 568 #endif
 569
 570                 case SSL3_ST_CR_FINISHED_A:
 571                 case SSL3_ST_CR_FINISHED_B:
 572
 573                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 574                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 575                                 SSL3_ST_CR_FINISHED_B);
 576                         if (ret <= 0) goto end;
 577
 578                         if (s->hit)
 579                                 s->state=SSL3_ST_CW_CHANGE_A;
 580                         else
 581                                 s->state=SSL_ST_OK;
 582                         s->init_num=0;
 583                         break;
 584
 585                 case SSL3_ST_CW_FLUSH:
 586                         s->rwstate=SSL_WRITING;
 587                         if (BIO_flush(s->wbio) <= 0)
 588                                 {
 589                                 ret= -1;
 590                                 goto end;
 591                                 }
 592                         s->rwstate=SSL_NOTHING;
 593                         s->state=s->s3->tmp.next_state;
 594                         break;
 595
 596                 case SSL_ST_OK:
 597                         /* clean a few things up */
 598                         ssl3_cleanup_key_block(s);
 599
 600                         if (s->init_buf != NULL)
 601                                 {
 602                                 BUF_MEM_free(s->init_buf);
 603                                 s->init_buf=NULL;
 604                                 }
 605
 606                         /* If we are not 'joining' the last two packets,
 607                          * remove the buffering now */
 608                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 609                                 ssl_free_wbio_buffer(s);
 610                         /* else do it later in ssl3_write */
 611
 612                         s->init_num=0;
 613                         s->renegotiate=0;
 614                         s->new_session=0;
 615
 616                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 617                         if (s->hit) s->ctx->stats.sess_hit++;
 618
 619                         ret=1;
 620                         /* s->server=0; */
 621                         s->handshake_func=ssl3_connect;
 622                         s->ctx->stats.sess_connect_good++;
 623
 624                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 625
 626                         goto end;
 627                         /* break; */
 628
 629                 default:
 630                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 631                         ret= -1;
 632                         goto end;
 633                         /* break; */
 634                         }
 635
 636                 /* did we do anything */
 637                 if (!s->s3->tmp.reuse_message && !skip)
 638                         {
 639                         if (s->debug)
 640                                 {
 641                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 642                                         goto end;
 643                                 }
 644
 645                         if ((cb != NULL) && (s->state != state))
 646                                 {
 647                                 new_state=s->state;
 648                                 s->state=state;
 649                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 650                                 s->state=new_state;
 651                                 }
 652                         }
 653                 skip=0;
 654                 }
 655 end:
 656         s->in_handshake--;
 657         if (buf != NULL)
 658                 BUF_MEM_free(buf);
 659         if (cb != NULL)
 660                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 661         return(ret);
 662         }
 663
 664
 665 int ssl3_client_hello(SSL *s)
 666         {
 667         unsigned char *buf;
 668         unsigned char *p,*d;
 669         int i;
 670         unsigned long l;
 671         int al = 0;
 672 #ifndef OPENSSL_NO_COMP
 673         int j;
 674         SSL_COMP *comp;
 675 #endif
 676
 677         buf=(unsigned char *)s->init_buf->data;
 678         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 679                 {
 680                 SSL_SESSION *sess = s->session;
 681                 if ((sess == NULL) ||
 682                         (sess->ssl_version != s->version) ||
 683 #ifdef OPENSSL_NO_TLSEXT
 684                         !sess->session_id_length ||
 685 #else
 686                         (!sess->session_id_length && !sess->tlsext_tick) ||
 687 #endif
 688                         (sess->not_resumable))
 689                         {
 690                         if (!ssl_get_new_session(s,0))
 691                                 goto err;
 692                         }
 693                 if (s->method->version == DTLS_ANY_VERSION)
 694                         {
 695                         /* Determine which DTLS version to use */
 696                         int options = s->options;
 697                         /* If DTLS 1.2 disabled correct the version number */
 698                         if (options & SSL_OP_NO_DTLSv1_2)
 699                                 {
 700                                 if (tls1_suiteb(s))
 701                                         {
 702                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 703                                         goto err;
 704                                         }
 705                                 /* Disabling all versions is silly: return an
 706                                  * error.
 707                                  */
 708                                 if (options & SSL_OP_NO_DTLSv1)
 709                                         {
 710                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 711                                         goto err;
 712                                         }
 713                                 /* Update method so we don't use any DTLS 1.2
 714                                  * features.
 715                                  */
 716                                 s->method = DTLSv1_client_method();
 717                                 s->version = DTLS1_VERSION;
 718                                 }
 719                         else
 720                                 {
 721                                 /* We only support one version: update method */
 722                                 if (options & SSL_OP_NO_DTLSv1)
 723                                         s->method = DTLSv1_2_client_method();
 724                                 s->version = DTLS1_2_VERSION;
 725                                 }
 726                         s->client_version = s->version;
 727                         }
 728                 /* else use the pre-loaded session */
 729
 730                 p=s->s3->client_random;
 731
 732                 /* for DTLS if client_random is initialized, reuse it, we are
 733                  * required to use same upon reply to HelloVerify */
 734                 if (SSL_IS_DTLS(s))
 735                         {
 736                         size_t idx;
 737                         i = 1;
 738                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 739                                 {
 740                                 if (p[idx])
 741                                         {
 742                                         i = 0;
 743                                         break;
 744                                         }
 745                                 }
 746                         }
 747                 else
 748                         i = 1;
 749
 750                 if (i)
 751                         ssl_fill_hello_random(s, 0, p,
 752                                               sizeof(s->s3->client_random));
 753
 754                 /* Do the message type and length last */
 755                 d=p= ssl_handshake_start(s);
 756
 757                 /* version indicates the negotiated version: for example from
 758                  * an SSLv2/v3 compatible client hello). The client_version
 759                  * field is the maximum version we permit and it is also
 760                  * used in RSA encrypted premaster secrets. Some servers can
 761                  * choke if we initially report a higher version then
 762                  * renegotiate to a lower one in the premaster secret. This
 763                  * didn't happen with TLS 1.0 as most servers supported it
 764                  * but it can with TLS 1.1 or later if the server only supports
 765                  * 1.0.
 766                  *
 767                  * Possible scenario with previous logic:
 768                  *      1. Client hello indicates TLS 1.2
 769                  *      2. Server hello says TLS 1.0
 770                  *      3. RSA encrypted premaster secret uses 1.2.
 771                  *      4. Handhaked proceeds using TLS 1.0.
 772                  *      5. Server sends hello request to renegotiate.
 773                  *      6. Client hello indicates TLS v1.0 as we now
 774                  *         know that is maximum server supports.
 775                  *      7. Server chokes on RSA encrypted premaster secret
 776                  *         containing version 1.0.
 777                  *
 778                  * For interoperability it should be OK to always use the
 779                  * maximum version we support in client hello and then rely
 780                  * on the checking of version to ensure the servers isn't
 781                  * being inconsistent: for example initially negotiating with
 782                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 783                  * client_version in client hello and not resetting it to
 784                  * the negotiated version.
 785                  */
 786 #if 0
 787                 *(p++)=s->version>>8;
 788                 *(p++)=s->version&0xff;
 789                 s->client_version=s->version;
 790 #else
 791                 *(p++)=s->client_version>>8;
 792                 *(p++)=s->client_version&0xff;
 793 #endif
 794
 795                 /* Random stuff */
 796                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 797                 p+=SSL3_RANDOM_SIZE;
 798
 799                 /* Session ID */
 800                 if (s->new_session)
 801                         i=0;
 802                 else
 803                         i=s->session->session_id_length;
 804                 *(p++)=i;
 805                 if (i != 0)
 806                         {
 807                         if (i > (int)sizeof(s->session->session_id))
 808                                 {
 809                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 810                                 goto err;
 811                                 }
 812                         memcpy(p,s->session->session_id,i);
 813                         p+=i;
 814                         }
 815
 816                 /* cookie stuff for DTLS */
 817                 if (SSL_IS_DTLS(s))
 818                         {
 819                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 820                                 {
 821                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 822                                 goto err;
 823                                 }
 824                         *(p++) = s->d1->cookie_len;
 825                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 826                         p += s->d1->cookie_len;
 827                         }
 828
 829                 /* Ciphers supported */
 830                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 831                 if (i == 0)
 832                         {
 833                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 834                         goto err;
 835                         }
 836 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 837                         /* Some servers hang if client hello > 256 bytes
 838                          * as hack workaround chop number of supported ciphers
 839                          * to keep it well below this if we use TLS v1.2
 840                          */
 841                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 842                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 843                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 844 #endif
 845                 s2n(i,p);
 846                 p+=i;
 847
 848                 /* COMPRESSION */
 849 #ifdef OPENSSL_NO_COMP
 850                 *(p++)=1;
 851 #else
 852
 853                 if ((s->options & SSL_OP_NO_COMPRESSION)
 854                                         || !s->ctx->comp_methods)
 855                         j=0;
 856                 else
 857                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 858                 *(p++)=1+j;
 859                 for (i=0; i<j; i++)
 860                         {
 861                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 862                         *(p++)=comp->id;
 863                         }
 864 #endif
 865                 *(p++)=0; /* Add the NULL method */
 866
 867 #ifndef OPENSSL_NO_TLSEXT
 868                 /* TLS extensions*/
 869                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 870                         {
 871                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 872                         goto err;
 873                         }
 874                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 875                         {
 876                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 877                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 878                         goto err;
 879                         }
 880 #endif
 881
 882                 l= p-d;
 883                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 884                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 885                 }
 886
 887         /* SSL3_ST_CW_CLNT_HELLO_B */
 888         return ssl_do_write(s);
 889 err:
 890         return(-1);
 891         }
 892
 893 int ssl3_get_server_hello(SSL *s)
 894         {
 895         STACK_OF(SSL_CIPHER) *sk;
 896         const SSL_CIPHER *c;
 897         CERT *ct = s->cert;
 898         unsigned char *p,*d;
 899         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 900         unsigned int j;
 901         long n;
 902 #ifndef OPENSSL_NO_COMP
 903         SSL_COMP *comp;
 904 #endif
 905         /* Hello verify request and/or server hello version may not
 906          * match so set first packet if we're negotiating version.
 907          */
 908         if (SSL_IS_DTLS(s))
 909                 s->first_packet = 1;
 910
 911         n=s->method->ssl_get_message(s,
 912                 SSL3_ST_CR_SRVR_HELLO_A,
 913                 SSL3_ST_CR_SRVR_HELLO_B,
 914                 -1,
 915                 20000, /* ?? */
 916                 &ok);
 917
 918         if (!ok) return((int)n);
 919
 920         if (SSL_IS_DTLS(s))
 921                 {
 922                 s->first_packet = 0;
 923                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 924                         {
 925                         if ( s->d1->send_cookie == 0)
 926                                 {
 927                                 s->s3->tmp.reuse_message = 1;
 928                                 return 1;
 929                                 }
 930                         else /* already sent a cookie */
 931                                 {
 932                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 933                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 934                                 goto f_err;
 935                                 }
 936                         }
 937                 }
 938
 939         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 940                 {
 941                 al=SSL_AD_UNEXPECTED_MESSAGE;
 942                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 943                 goto f_err;
 944                 }
 945
 946         d=p=(unsigned char *)s->init_msg;
 947         if (s->method->version == DTLS_ANY_VERSION)
 948                 {
 949                 /* Work out correct protocol version to use */
 950                 int hversion = (p[0] << 8)|p[1];
 951                 int options = s->options;
 952                 if (hversion == DTLS1_2_VERSION
 953                         && !(options & SSL_OP_NO_DTLSv1_2))
 954                         s->method = DTLSv1_2_client_method();
 955                 else if (tls1_suiteb(s))
 956                         {
 957                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 958                         s->version = hversion;
 959                         al = SSL_AD_PROTOCOL_VERSION;
 960                         goto f_err;
 961                         }
 962                 else if (hversion == DTLS1_VERSION
 963                         && !(options & SSL_OP_NO_DTLSv1))
 964                         s->method = DTLSv1_client_method();
 965                 else
 966                         {
 967                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 968                         s->version = hversion;
 969                         al = SSL_AD_PROTOCOL_VERSION;
 970                         goto f_err;
 971                         }
 972                 s->version = s->client_version = s->method->version;
 973                 }
 974
 975         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 976                 {
 977                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 978                 s->version=(s->version&0xff00)|p[1];
 979                 al=SSL_AD_PROTOCOL_VERSION;
 980                 goto f_err;
 981                 }
 982         p+=2;
 983
 984         /* load the server hello data */
 985         /* load the server random */
 986         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 987         p+=SSL3_RANDOM_SIZE;
 988
 989         /* get the session-id */
 990         j= *(p++);
 991
 992         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 993                 {
 994                 al=SSL_AD_ILLEGAL_PARAMETER;
 995                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 996                 goto f_err;
 997                 }
 998
 999 #ifndef OPENSSL_NO_TLSEXT
1000         /* check if we want to resume the session based on external pre-shared secret */
1001         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1002                 {
1003                 SSL_CIPHER *pref_cipher=NULL;
1004                 s->session->master_key_length=sizeof(s->session->master_key);
1005                 if (s->tls_session_secret_cb(s, s->session->master_key,
1006                                              &s->session->master_key_length,
1007                                              NULL, &pref_cipher,
1008                                              s->tls_session_secret_cb_arg))
1009                         {
1010                         s->session->cipher = pref_cipher ?
1011                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1012                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1013                         }
1014                 }
1015 #endif /* OPENSSL_NO_TLSEXT */
1016
1017         if (j != 0 && j == s->session->session_id_length
1018             && memcmp(p,s->session->session_id,j) == 0)
1019             {
1020             if(s->sid_ctx_length != s->session->sid_ctx_length
1021                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1022                 {
1023                 /* actually a client application bug */
1024                 al=SSL_AD_ILLEGAL_PARAMETER;
1025                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1026                 goto f_err;
1027                 }
1028             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1029             s->hit=1;
1030             }
1031         else    /* a miss or crap from the other end */
1032                 {
1033                 /* If we were trying for session-id reuse, make a new
1034                  * SSL_SESSION so we don't stuff up other people */
1035                 s->hit=0;
1036                 if (s->session->session_id_length > 0)
1037                         {
1038                         if (!ssl_get_new_session(s,0))
1039                                 {
1040                                 goto f_err;
1041                                 }
1042                         }
1043                 s->session->session_id_length=j;
1044                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1045                 }
1046         p+=j;
1047         c=ssl_get_cipher_by_char(s,p);
1048         if (c == NULL)
1049                 {
1050                 /* unknown cipher */
1051                 al=SSL_AD_ILLEGAL_PARAMETER;
1052                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1053                 goto f_err;
1054                 }
1055         /* If it is a disabled cipher we didn't send it in client hello,
1056          * so return an error.
1057          */
1058         if (c->algorithm_ssl & ct->mask_ssl ||
1059                 c->algorithm_mkey & ct->mask_k ||
1060                 c->algorithm_auth & ct->mask_a)
1061                 {
1062                 al=SSL_AD_ILLEGAL_PARAMETER;
1063                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1064                 goto f_err;
1065                 }
1066         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1067
1068         sk=ssl_get_ciphers_by_id(s);
1069         i=sk_SSL_CIPHER_find(sk,c);
1070         if (i < 0)
1071                 {
1072                 /* we did not say we would use this cipher */
1073                 al=SSL_AD_ILLEGAL_PARAMETER;
1074                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1075                 goto f_err;
1076                 }
1077
1078         /* Depending on the session caching (internal/external), the cipher
1079            and/or cipher_id values may not be set. Make sure that
1080            cipher_id is set and use it for comparison. */
1081         if (s->session->cipher)
1082                 s->session->cipher_id = s->session->cipher->id;
1083         if (s->hit && (s->session->cipher_id != c->id))
1084                 {
1085 /* Workaround is now obsolete */
1086 #if 0
1087                 if (!(s->options &
1088                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1089 #endif
1090                         {
1091                         al=SSL_AD_ILLEGAL_PARAMETER;
1092                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1093                         goto f_err;
1094                         }
1095                 }
1096         s->s3->tmp.new_cipher=c;
1097         /* Don't digest cached records if no sigalgs: we may need them for
1098          * client authentication.
1099          */
1100         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1101                 goto f_err;
1102         /* lets get the compression algorithm */
1103         /* COMPRESSION */
1104 #ifdef OPENSSL_NO_COMP
1105         if (*(p++) != 0)
1106                 {
1107                 al=SSL_AD_ILLEGAL_PARAMETER;
1108                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1109                 goto f_err;
1110                 }
1111         /* If compression is disabled we'd better not try to resume a session
1112          * using compression.
1113          */
1114         if (s->session->compress_meth != 0)
1115                 {
1116                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1117                 goto f_err;
1118                 }
1119 #else
1120         j= *(p++);
1121         if (s->hit && j != s->session->compress_meth)
1122                 {
1123                 al=SSL_AD_ILLEGAL_PARAMETER;
1124                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1125                 goto f_err;
1126                 }
1127         if (j == 0)
1128                 comp=NULL;
1129         else if (s->options & SSL_OP_NO_COMPRESSION)
1130                 {
1131                 al=SSL_AD_ILLEGAL_PARAMETER;
1132                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1133                 goto f_err;
1134                 }
1135         else
1136                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1137
1138         if ((j != 0) && (comp == NULL))
1139                 {
1140                 al=SSL_AD_ILLEGAL_PARAMETER;
1141                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1142                 goto f_err;
1143                 }
1144         else
1145                 {
1146                 s->s3->tmp.new_compression=comp;
1147                 }
1148 #endif
1149
1150 #ifndef OPENSSL_NO_TLSEXT
1151         /* TLS extensions*/
1152         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1153                 {
1154                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1155                 goto err;
1156                 }
1157 #endif
1158
1159         if (p != (d+n))
1160                 {
1161                 /* wrong packet length */
1162                 al=SSL_AD_DECODE_ERROR;
1163                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1164                 goto f_err;
1165                 }
1166
1167         return(1);
1168 f_err:
1169         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1170 err:
1171         return(-1);
1172         }
1173
1174 int ssl3_get_server_certificate(SSL *s)
1175         {
1176         int al,i,ok,ret= -1;
1177         unsigned long n,nc,llen,l;
1178         X509 *x=NULL;
1179         const unsigned char *q,*p;
1180         unsigned char *d;
1181         STACK_OF(X509) *sk=NULL;
1182         SESS_CERT *sc;
1183         EVP_PKEY *pkey=NULL;
1184         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1185
1186         n=s->method->ssl_get_message(s,
1187                 SSL3_ST_CR_CERT_A,
1188                 SSL3_ST_CR_CERT_B,
1189                 -1,
1190                 s->max_cert_list,
1191                 &ok);
1192
1193         if (!ok) return((int)n);
1194
1195         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1196                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1197                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1198                 {
1199                 s->s3->tmp.reuse_message=1;
1200                 return(1);
1201                 }
1202
1203         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1204                 {
1205                 al=SSL_AD_UNEXPECTED_MESSAGE;
1206                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1207                 goto f_err;
1208                 }
1209         p=d=(unsigned char *)s->init_msg;
1210
1211         if ((sk=sk_X509_new_null()) == NULL)
1212                 {
1213                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1214                 goto err;
1215                 }
1216
1217         n2l3(p,llen);
1218         if (llen+3 != n)
1219                 {
1220                 al=SSL_AD_DECODE_ERROR;
1221                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1222                 goto f_err;
1223                 }
1224         for (nc=0; nc<llen; )
1225                 {
1226                 n2l3(p,l);
1227                 if ((l+nc+3) > llen)
1228                         {
1229                         al=SSL_AD_DECODE_ERROR;
1230                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1231                         goto f_err;
1232                         }
1233
1234                 q=p;
1235                 x=d2i_X509(NULL,&q,l);
1236                 if (x == NULL)
1237                         {
1238                         al=SSL_AD_BAD_CERTIFICATE;
1239                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1240                         goto f_err;
1241                         }
1242                 if (q != (p+l))
1243                         {
1244                         al=SSL_AD_DECODE_ERROR;
1245                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1246                         goto f_err;
1247                         }
1248                 if (!sk_X509_push(sk,x))
1249                         {
1250                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1251                         goto err;
1252                         }
1253                 x=NULL;
1254                 nc+=l+3;
1255                 p=q;
1256                 }
1257
1258         i=ssl_verify_cert_chain(s,sk);
1259         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1260 #ifndef OPENSSL_NO_KRB5
1261             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1262                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1263 #endif /* OPENSSL_NO_KRB5 */
1264                 )
1265                 {
1266                 al=ssl_verify_alarm_type(s->verify_result);
1267                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1268                 goto f_err;
1269                 }
1270         ERR_clear_error(); /* but we keep s->verify_result */
1271
1272         sc=ssl_sess_cert_new();
1273         if (sc == NULL) goto err;
1274
1275         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1276         s->session->sess_cert=sc;
1277
1278         sc->cert_chain=sk;
1279         /* Inconsistency alert: cert_chain does include the peer's
1280          * certificate, which we don't include in s3_srvr.c */
1281         x=sk_X509_value(sk,0);
1282         sk=NULL;
1283         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1284
1285         pkey=X509_get_pubkey(x);
1286
1287         /* VRS: allow null cert if auth == KRB5 */
1288         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1289                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1290                     ? 0 : 1;
1291
1292 #ifdef KSSL_DEBUG
1293         printf("pkey,x = %p, %p\n", pkey,x);
1294         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1295         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1296                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1297 #endif    /* KSSL_DEBUG */
1298
1299         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1300                 {
1301                 x=NULL;
1302                 al=SSL3_AL_FATAL;
1303                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1304                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1305                 goto f_err;
1306                 }
1307
1308         i=ssl_cert_type(x,pkey);
1309         if (need_cert && i < 0)
1310                 {
1311                 x=NULL;
1312                 al=SSL3_AL_FATAL;
1313                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1314                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1315                 goto f_err;
1316                 }
1317
1318         if (need_cert)
1319                 {
1320                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1321                 if (exp_idx >= 0 && i != exp_idx)
1322                         {
1323                         x=NULL;
1324                         al=SSL_AD_ILLEGAL_PARAMETER;
1325                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1326                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1327                         goto f_err;
1328                         }
1329                 sc->peer_cert_type=i;
1330                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1331                 /* Why would the following ever happen?
1332                  * We just created sc a couple of lines ago. */
1333                 if (sc->peer_pkeys[i].x509 != NULL)
1334                         X509_free(sc->peer_pkeys[i].x509);
1335                 sc->peer_pkeys[i].x509=x;
1336                 sc->peer_key= &(sc->peer_pkeys[i]);
1337
1338                 if (s->session->peer != NULL)
1339                         X509_free(s->session->peer);
1340                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1341                 s->session->peer=x;
1342                 }
1343         else
1344                 {
1345                 sc->peer_cert_type=i;
1346                 sc->peer_key= NULL;
1347
1348                 if (s->session->peer != NULL)
1349                         X509_free(s->session->peer);
1350                 s->session->peer=NULL;
1351                 }
1352         s->session->verify_result = s->verify_result;
1353
1354         x=NULL;
1355         ret=1;
1356         if (0)
1357                 {
1358 f_err:
1359                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1360                 }
1361 err:
1362         EVP_PKEY_free(pkey);
1363         X509_free(x);
1364         sk_X509_pop_free(sk,X509_free);
1365         return(ret);
1366         }
1367
1368 int ssl3_get_key_exchange(SSL *s)
1369         {
1370 #ifndef OPENSSL_NO_RSA
1371         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1372 #endif
1373         EVP_MD_CTX md_ctx;
1374         unsigned char *param,*p;
1375         int al,j,ok;
1376         long i,param_len,n,alg_k,alg_a;
1377         EVP_PKEY *pkey=NULL;
1378         const EVP_MD *md = NULL;
1379 #ifndef OPENSSL_NO_RSA
1380         RSA *rsa=NULL;
1381 #endif
1382 #ifndef OPENSSL_NO_DH
1383         DH *dh=NULL;
1384 #endif
1385 #ifndef OPENSSL_NO_ECDH
1386         EC_KEY *ecdh = NULL;
1387         BN_CTX *bn_ctx = NULL;
1388         EC_POINT *srvr_ecpoint = NULL;
1389         int curve_nid = 0;
1390         int encoded_pt_len = 0;
1391 #endif
1392
1393         /* use same message size as in ssl3_get_certificate_request()
1394          * as ServerKeyExchange message may be skipped */
1395         n=s->method->ssl_get_message(s,
1396                 SSL3_ST_CR_KEY_EXCH_A,
1397                 SSL3_ST_CR_KEY_EXCH_B,
1398                 -1,
1399                 s->max_cert_list,
1400                 &ok);
1401         if (!ok) return((int)n);
1402
1403         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1404                 {
1405 #ifndef OPENSSL_NO_PSK
1406                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1407                    omitted if no identity hint is sent. Set
1408                    session->sess_cert anyway to avoid problems
1409                    later.*/
1410                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1411                         {
1412                         s->session->sess_cert=ssl_sess_cert_new();
1413                         if (s->ctx->psk_identity_hint)
1414                                 OPENSSL_free(s->ctx->psk_identity_hint);
1415                         s->ctx->psk_identity_hint = NULL;
1416                         }
1417 #endif
1418                 s->s3->tmp.reuse_message=1;
1419                 return(1);
1420                 }
1421
1422         param=p=(unsigned char *)s->init_msg;
1423         if (s->session->sess_cert != NULL)
1424                 {
1425 #ifndef OPENSSL_NO_RSA
1426                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1427                         {
1428                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1429                         s->session->sess_cert->peer_rsa_tmp=NULL;
1430                         }
1431 #endif
1432 #ifndef OPENSSL_NO_DH
1433                 if (s->session->sess_cert->peer_dh_tmp)
1434                         {
1435                         DH_free(s->session->sess_cert->peer_dh_tmp);
1436                         s->session->sess_cert->peer_dh_tmp=NULL;
1437                         }
1438 #endif
1439 #ifndef OPENSSL_NO_ECDH
1440                 if (s->session->sess_cert->peer_ecdh_tmp)
1441                         {
1442                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1443                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1444                         }
1445 #endif
1446                 }
1447         else
1448                 {
1449                 s->session->sess_cert=ssl_sess_cert_new();
1450                 }
1451
1452         /* Total length of the parameters including the length prefix */
1453         param_len=0;
1454
1455         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1456         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1457         EVP_MD_CTX_init(&md_ctx);
1458
1459         al=SSL_AD_DECODE_ERROR;
1460
1461 #ifndef OPENSSL_NO_PSK
1462         if (alg_k & SSL_kPSK)
1463                 {
1464                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1465
1466                 param_len = 2;
1467                 if (param_len > n)
1468                         {
1469                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1470                                 SSL_R_LENGTH_TOO_SHORT);
1471                         goto f_err;
1472                         }
1473                 n2s(p,i);
1474
1475                 /* Store PSK identity hint for later use, hint is used
1476                  * in ssl3_send_client_key_exchange.  Assume that the
1477                  * maximum length of a PSK identity hint can be as
1478                  * long as the maximum length of a PSK identity. */
1479                 if (i > PSK_MAX_IDENTITY_LEN)
1480                         {
1481                         al=SSL_AD_HANDSHAKE_FAILURE;
1482                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1483                                 SSL_R_DATA_LENGTH_TOO_LONG);
1484                         goto f_err;
1485                         }
1486                 if (i > n - param_len)
1487                         {
1488                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1489                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1490                         goto f_err;
1491                         }
1492                 param_len += i;
1493
1494                 /* If received PSK identity hint contains NULL
1495                  * characters, the hint is truncated from the first
1496                  * NULL. p may not be ending with NULL, so create a
1497                  * NULL-terminated string. */
1498                 memcpy(tmp_id_hint, p, i);
1499                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1500                 if (s->ctx->psk_identity_hint != NULL)
1501                         OPENSSL_free(s->ctx->psk_identity_hint);
1502                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1503                 if (s->ctx->psk_identity_hint == NULL)
1504                         {
1505                         al=SSL_AD_HANDSHAKE_FAILURE;
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1507                         goto f_err;
1508                         }
1509
1510                 p+=i;
1511                 n-=param_len;
1512                 }
1513         else
1514 #endif /* !OPENSSL_NO_PSK */
1515 #ifndef OPENSSL_NO_SRP
1516         if (alg_k & SSL_kSRP)
1517                 {
1518                 param_len = 2;
1519                 if (param_len > n)
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1522                                 SSL_R_LENGTH_TOO_SHORT);
1523                         goto f_err;
1524                         }
1525                 n2s(p,i);
1526
1527                 if (i > n - param_len)
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1530                         goto f_err;
1531                         }
1532                 param_len += i;
1533
1534                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1537                         goto err;
1538                         }
1539                 p+=i;
1540
1541
1542                 if (2 > n - param_len)
1543                         {
1544                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1545                                 SSL_R_LENGTH_TOO_SHORT);
1546                         goto f_err;
1547                         }
1548                 param_len += 2;
1549
1550                 n2s(p,i);
1551
1552                 if (i > n - param_len)
1553                         {
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1555                         goto f_err;
1556                         }
1557                 param_len += i;
1558
1559                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1560                         {
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1562                         goto err;
1563                         }
1564                 p+=i;
1565
1566
1567                 if (1 > n - param_len)
1568                         {
1569                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1570                                 SSL_R_LENGTH_TOO_SHORT);
1571                         goto f_err;
1572                         }
1573                 param_len += 1;
1574
1575                 i = (unsigned int)(p[0]);
1576                 p++;
1577
1578                 if (i > n - param_len)
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1581                         goto f_err;
1582                         }
1583                 param_len += i;
1584
1585                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1586                         {
1587                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1588                         goto err;
1589                         }
1590                 p+=i;
1591
1592                 if (2 > n - param_len)
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1595                                 SSL_R_LENGTH_TOO_SHORT);
1596                         goto f_err;
1597                         }
1598                 param_len += 2;
1599
1600                 n2s(p,i);
1601
1602                 if (i > n - param_len)
1603                         {
1604                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1605                         goto f_err;
1606                         }
1607                 param_len += i;
1608
1609                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1610                         {
1611                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1612                         goto err;
1613                         }
1614                 p+=i;
1615                 n-=param_len;
1616
1617                 if (!srp_verify_server_param(s, &al))
1618                         {
1619                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1620                         goto f_err;
1621                         }
1622
1623 /* We must check if there is a certificate */
1624 #ifndef OPENSSL_NO_RSA
1625                 if (alg_a & SSL_aRSA)
1626                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1627 #else
1628                 if (0)
1629                         ;
1630 #endif
1631 #ifndef OPENSSL_NO_DSA
1632                 else if (alg_a & SSL_aDSS)
1633                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1634 #endif
1635                 }
1636         else
1637 #endif /* !OPENSSL_NO_SRP */
1638 #ifndef OPENSSL_NO_RSA
1639         if (alg_k & SSL_kRSA)
1640                 {
1641                 if ((rsa=RSA_new()) == NULL)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1644                         goto err;
1645                         }
1646
1647                 param_len = 2;
1648                 if (param_len > n)
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1651                                 SSL_R_LENGTH_TOO_SHORT);
1652                         goto f_err;
1653                         }
1654                 n2s(p,i);
1655
1656                 if (i > n - param_len)
1657                         {
1658                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1659                         goto f_err;
1660                         }
1661                 param_len += i;
1662
1663                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1664                         {
1665                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1666                         goto err;
1667                         }
1668                 p+=i;
1669
1670                 if (2 > n - param_len)
1671                         {
1672                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1673                                 SSL_R_LENGTH_TOO_SHORT);
1674                         goto f_err;
1675                         }
1676                 param_len += 2;
1677
1678                 n2s(p,i);
1679
1680                 if (i > n - param_len)
1681                         {
1682                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1683                         goto f_err;
1684                         }
1685                 param_len += i;
1686
1687                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1688                         {
1689                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1690                         goto err;
1691                         }
1692                 p+=i;
1693                 n-=param_len;
1694
1695                 /* this should be because we are using an export cipher */
1696                 if (alg_a & SSL_aRSA)
1697                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1698                 else
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1701                         goto err;
1702                         }
1703                 s->session->sess_cert->peer_rsa_tmp=rsa;
1704                 rsa=NULL;
1705                 }
1706 #else /* OPENSSL_NO_RSA */
1707         if (0)
1708                 ;
1709 #endif
1710 #ifndef OPENSSL_NO_DH
1711         else if (alg_k & SSL_kEDH)
1712                 {
1713                 if ((dh=DH_new()) == NULL)
1714                         {
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1716                         goto err;
1717                         }
1718
1719                 param_len = 2;
1720                 if (param_len > n)
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1723                                 SSL_R_LENGTH_TOO_SHORT);
1724                         goto f_err;
1725                         }
1726                 n2s(p,i);
1727
1728                 if (i > n - param_len)
1729                         {
1730                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1731                         goto f_err;
1732                         }
1733                 param_len += i;
1734
1735                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1736                         {
1737                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1738                         goto err;
1739                         }
1740                 p+=i;
1741
1742                 if (2 > n - param_len)
1743                         {
1744                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1745                                 SSL_R_LENGTH_TOO_SHORT);
1746                         goto f_err;
1747                         }
1748                 param_len += 2;
1749
1750                 n2s(p,i);
1751
1752                 if (i > n - param_len)
1753                         {
1754                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1755                         goto f_err;
1756                         }
1757                 param_len += i;
1758
1759                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1760                         {
1761                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1762                         goto err;
1763                         }
1764                 p+=i;
1765
1766                 if (2 > n - param_len)
1767                         {
1768                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1769                                 SSL_R_LENGTH_TOO_SHORT);
1770                         goto f_err;
1771                         }
1772                 param_len += 2;
1773
1774                 n2s(p,i);
1775
1776                 if (i > n - param_len)
1777                         {
1778                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1779                         goto f_err;
1780                         }
1781                 param_len += i;
1782
1783                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1784                         {
1785                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1786                         goto err;
1787                         }
1788                 p+=i;
1789                 n-=param_len;
1790
1791 #ifndef OPENSSL_NO_RSA
1792                 if (alg_a & SSL_aRSA)
1793                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1794 #else
1795                 if (0)
1796                         ;
1797 #endif
1798 #ifndef OPENSSL_NO_DSA
1799                 else if (alg_a & SSL_aDSS)
1800                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1801 #endif
1802                 /* else anonymous DH, so no certificate or pkey. */
1803
1804                 s->session->sess_cert->peer_dh_tmp=dh;
1805                 dh=NULL;
1806                 }
1807         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1808                 {
1809                 al=SSL_AD_ILLEGAL_PARAMETER;
1810                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1811                 goto f_err;
1812                 }
1813 #endif /* !OPENSSL_NO_DH */
1814
1815 #ifndef OPENSSL_NO_ECDH
1816         else if (alg_k & SSL_kEECDH)
1817                 {
1818                 EC_GROUP *ngroup;
1819                 const EC_GROUP *group;
1820
1821                 if ((ecdh=EC_KEY_new()) == NULL)
1822                         {
1823                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1824                         goto err;
1825                         }
1826
1827                 /* Extract elliptic curve parameters and the
1828                  * server's ephemeral ECDH public key.
1829                  * Keep accumulating lengths of various components in
1830                  * param_len and make sure it never exceeds n.
1831                  */
1832
1833                 /* XXX: For now we only support named (not generic) curves
1834                  * and the ECParameters in this case is just three bytes. We
1835                  * also need one byte for the length of the encoded point
1836                  */
1837                 param_len=4;
1838                 if (param_len > n)
1839                         {
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1841                                 SSL_R_LENGTH_TOO_SHORT);
1842                         goto f_err;
1843                         }
1844                 /* Check curve is one of our preferences, if not server has
1845                  * sent an invalid curve. ECParameters is 3 bytes.
1846                  */
1847                 if (!tls1_check_curve(s, p, 3))
1848                         {
1849                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1850                         goto f_err;
1851                         }
1852
1853                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1854                         {
1855                         al=SSL_AD_INTERNAL_ERROR;
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1857                         goto f_err;
1858                         }
1859
1860                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1861                 if (ngroup == NULL)
1862                         {
1863                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1864                         goto err;
1865                         }
1866                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1867                         {
1868                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1869                         goto err;
1870                         }
1871                 EC_GROUP_free(ngroup);
1872
1873                 group = EC_KEY_get0_group(ecdh);
1874
1875                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1876                     (EC_GROUP_get_degree(group) > 163))
1877                         {
1878                         al=SSL_AD_EXPORT_RESTRICTION;
1879                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1880                         goto f_err;
1881                         }
1882
1883                 p+=3;
1884
1885                 /* Next, get the encoded ECPoint */
1886                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1887                     ((bn_ctx = BN_CTX_new()) == NULL))
1888                         {
1889                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1890                         goto err;
1891                         }
1892
1893                 encoded_pt_len = *p;  /* length of encoded point */
1894                 p+=1;
1895
1896                 if ((encoded_pt_len > n - param_len) ||
1897                     (EC_POINT_oct2point(group, srvr_ecpoint,
1898                         p, encoded_pt_len, bn_ctx) == 0))
1899                         {
1900                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1901                         goto f_err;
1902                         }
1903                 param_len += encoded_pt_len;
1904
1905                 n-=param_len;
1906                 p+=encoded_pt_len;
1907
1908                 /* The ECC/TLS specification does not mention
1909                  * the use of DSA to sign ECParameters in the server
1910                  * key exchange message. We do support RSA and ECDSA.
1911                  */
1912                 if (0) ;
1913 #ifndef OPENSSL_NO_RSA
1914                 else if (alg_a & SSL_aRSA)
1915                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1916 #endif
1917 #ifndef OPENSSL_NO_ECDSA
1918                 else if (alg_a & SSL_aECDSA)
1919                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1920 #endif
1921                 /* else anonymous ECDH, so no certificate or pkey. */
1922                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1923                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1924                 ecdh=NULL;
1925                 BN_CTX_free(bn_ctx);
1926                 bn_ctx = NULL;
1927                 EC_POINT_free(srvr_ecpoint);
1928                 srvr_ecpoint = NULL;
1929                 }
1930         else if (alg_k)
1931                 {
1932                 al=SSL_AD_UNEXPECTED_MESSAGE;
1933                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1934                 goto f_err;
1935                 }
1936 #endif /* !OPENSSL_NO_ECDH */
1937
1938
1939         /* p points to the next byte, there are 'n' bytes left */
1940
1941         /* if it was signed, check the signature */
1942         if (pkey != NULL)
1943                 {
1944                 if (SSL_USE_SIGALGS(s))
1945                         {
1946                         int rv;
1947                         if (2 > n)
1948                                 {
1949                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1950                                         SSL_R_LENGTH_TOO_SHORT);
1951                                 goto f_err;
1952                                 }
1953                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1954                         if (rv == -1)
1955                                 goto err;
1956                         else if (rv == 0)
1957                                 {
1958                                 goto f_err;
1959                                 }
1960 #ifdef SSL_DEBUG
1961 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1962 #endif
1963                         p += 2;
1964                         n -= 2;
1965                         }
1966                 else
1967                         md = EVP_sha1();
1968
1969                 if (2 > n)
1970                         {
1971                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1972                                 SSL_R_LENGTH_TOO_SHORT);
1973                         goto f_err;
1974                         }
1975                 n2s(p,i);
1976                 n-=2;
1977                 j=EVP_PKEY_size(pkey);
1978
1979                 /* Check signature length. If n is 0 then signature is empty */
1980                 if ((i != n) || (n > j) || (n <= 0))
1981                         {
1982                         /* wrong packet length */
1983                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1984                         goto f_err;
1985                         }
1986
1987 #ifndef OPENSSL_NO_RSA
1988                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1989                         {
1990                         int num;
1991                         unsigned int size;
1992
1993                         j=0;
1994                         q=md_buf;
1995                         for (num=2; num > 0; num--)
1996                                 {
1997                                 EVP_MD_CTX_set_flags(&md_ctx,
1998                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1999                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
2000                                         ?s->ctx->md5:s->ctx->sha1, NULL);
2001                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2002                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2003                                 EVP_DigestUpdate(&md_ctx,param,param_len);
2004                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
2005                                 q+=size;
2006                                 j+=size;
2007                                 }
2008                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2009                                                                 pkey->pkey.rsa);
2010                         if (i < 0)
2011                                 {
2012                                 al=SSL_AD_DECRYPT_ERROR;
2013                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2014                                 goto f_err;
2015                                 }
2016                         if (i == 0)
2017                                 {
2018                                 /* bad signature */
2019                                 al=SSL_AD_DECRYPT_ERROR;
2020                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2021                                 goto f_err;
2022                                 }
2023                         }
2024                 else
2025 #endif
2026                         {
2027                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2028                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2029                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2030                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2031                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2032                                 {
2033                                 /* bad signature */
2034                                 al=SSL_AD_DECRYPT_ERROR;
2035                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2036                                 goto f_err;
2037                                 }
2038                         }
2039                 }
2040         else
2041                 {
2042                 /* aNULL, aSRP or kPSK do not need public keys */
2043                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2044                         {
2045                         /* Might be wrong key type, check it */
2046                         if (ssl3_check_cert_and_algorithm(s))
2047                                 /* Otherwise this shouldn't happen */
2048                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2049                         goto err;
2050                         }
2051                 /* still data left over */
2052                 if (n != 0)
2053                         {
2054                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2055                         goto f_err;
2056                         }
2057                 }
2058         EVP_PKEY_free(pkey);
2059         EVP_MD_CTX_cleanup(&md_ctx);
2060         return(1);
2061 f_err:
2062         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2063 err:
2064         EVP_PKEY_free(pkey);
2065 #ifndef OPENSSL_NO_RSA
2066         if (rsa != NULL)
2067                 RSA_free(rsa);
2068 #endif
2069 #ifndef OPENSSL_NO_DH
2070         if (dh != NULL)
2071                 DH_free(dh);
2072 #endif
2073 #ifndef OPENSSL_NO_ECDH
2074         BN_CTX_free(bn_ctx);
2075         EC_POINT_free(srvr_ecpoint);
2076         if (ecdh != NULL)
2077                 EC_KEY_free(ecdh);
2078 #endif
2079         EVP_MD_CTX_cleanup(&md_ctx);
2080         return(-1);
2081         }
2082
2083 int ssl3_get_certificate_request(SSL *s)
2084         {
2085         int ok,ret=0;
2086         unsigned long n,nc,l;
2087         unsigned int llen, ctype_num,i;
2088         X509_NAME *xn=NULL;
2089         const unsigned char *p,*q;
2090         unsigned char *d;
2091         STACK_OF(X509_NAME) *ca_sk=NULL;
2092
2093         n=s->method->ssl_get_message(s,
2094                 SSL3_ST_CR_CERT_REQ_A,
2095                 SSL3_ST_CR_CERT_REQ_B,
2096                 -1,
2097                 s->max_cert_list,
2098                 &ok);
2099
2100         if (!ok) return((int)n);
2101
2102         s->s3->tmp.cert_req=0;
2103
2104         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2105                 {
2106                 s->s3->tmp.reuse_message=1;
2107                 /* If we get here we don't need any cached handshake records
2108                  * as we wont be doing client auth.
2109                  */
2110                 if (s->s3->handshake_buffer)
2111                         {
2112                         if (!ssl3_digest_cached_records(s))
2113                                 goto err;
2114                         }
2115                 return(1);
2116                 }
2117
2118         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2119                 {
2120                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2121                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2122                 goto err;
2123                 }
2124
2125         /* TLS does not like anon-DH with client cert */
2126         if (s->version > SSL3_VERSION)
2127                 {
2128                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2129                         {
2130                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2131                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2132                         goto err;
2133                         }
2134                 }
2135
2136         p=d=(unsigned char *)s->init_msg;
2137
2138         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2139                 {
2140                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2141                 goto err;
2142                 }
2143
2144         /* get the certificate types */
2145         ctype_num= *(p++);
2146         if (s->cert->ctypes)
2147                 {
2148                 OPENSSL_free(s->cert->ctypes);
2149                 s->cert->ctypes = NULL;
2150                 }
2151         if (ctype_num > SSL3_CT_NUMBER)
2152                 {
2153                 /* If we exceed static buffer copy all to cert structure */
2154                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2155                 memcpy(s->cert->ctypes, p, ctype_num);
2156                 s->cert->ctype_num = (size_t)ctype_num;
2157                 ctype_num=SSL3_CT_NUMBER;
2158                 }
2159         for (i=0; i<ctype_num; i++)
2160                 s->s3->tmp.ctype[i]= p[i];
2161         p+=p[-1];
2162         if (SSL_USE_SIGALGS(s))
2163                 {
2164                 n2s(p, llen);
2165                 /* Check we have enough room for signature algorithms and
2166                  * following length value.
2167                  */
2168                 if ((unsigned long)(p - d + llen + 2) > n)
2169                         {
2170                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2171                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2172                         goto err;
2173                         }
2174                 /* Clear certificate digests and validity flags */
2175                 for (i = 0; i < SSL_PKEY_NUM; i++)
2176                         {
2177                         s->cert->pkeys[i].digest = NULL;
2178                         s->cert->pkeys[i].valid_flags = 0;
2179                         }
2180                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2181                         {
2182                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2183                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2184                         goto err;
2185                         }
2186                 if (!tls1_process_sigalgs(s))
2187                         {
2188                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2189                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2190                         goto err;
2191                         }
2192                 p += llen;
2193                 }
2194
2195         /* get the CA RDNs */
2196         n2s(p,llen);
2197 #if 0
2198 {
2199 FILE *out;
2200 out=fopen("/tmp/vsign.der","w");
2201 fwrite(p,1,llen,out);
2202 fclose(out);
2203 }
2204 #endif
2205
2206         if ((unsigned long)(p - d + llen) != n)
2207                 {
2208                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2209                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2210                 goto err;
2211                 }
2212
2213         for (nc=0; nc<llen; )
2214                 {
2215                 n2s(p,l);
2216                 if ((l+nc+2) > llen)
2217                         {
2218                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2219                                 goto cont; /* netscape bugs */
2220                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2221                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2222                         goto err;
2223                         }
2224
2225                 q=p;
2226
2227                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2228                         {
2229                         /* If netscape tolerance is on, ignore errors */
2230                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2231                                 goto cont;
2232                         else
2233                                 {
2234                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2235                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2236                                 goto err;
2237                                 }
2238                         }
2239
2240                 if (q != (p+l))
2241                         {
2242                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2243                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2244                         goto err;
2245                         }
2246                 if (!sk_X509_NAME_push(ca_sk,xn))
2247                         {
2248                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2249                         goto err;
2250                         }
2251
2252                 p+=l;
2253                 nc+=l+2;
2254                 }
2255
2256         if (0)
2257                 {
2258 cont:
2259                 ERR_clear_error();
2260                 }
2261
2262         /* we should setup a certificate to return.... */
2263         s->s3->tmp.cert_req=1;
2264         s->s3->tmp.ctype_num=ctype_num;
2265         if (s->s3->tmp.ca_names != NULL)
2266                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2267         s->s3->tmp.ca_names=ca_sk;
2268         ca_sk=NULL;
2269
2270         ret=1;
2271 err:
2272         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2273         return(ret);
2274         }
2275
2276 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2277         {
2278         return(X509_NAME_cmp(*a,*b));
2279         }
2280 #ifndef OPENSSL_NO_TLSEXT
2281 int ssl3_get_new_session_ticket(SSL *s)
2282         {
2283         int ok,al,ret=0, ticklen;
2284         long n;
2285         const unsigned char *p;
2286         unsigned char *d;
2287
2288         n=s->method->ssl_get_message(s,
2289                 SSL3_ST_CR_SESSION_TICKET_A,
2290                 SSL3_ST_CR_SESSION_TICKET_B,
2291                 -1,
2292                 16384,
2293                 &ok);
2294
2295         if (!ok)
2296                 return((int)n);
2297
2298         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2299                 {
2300                 s->s3->tmp.reuse_message=1;
2301                 return(1);
2302                 }
2303         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2304                 {
2305                 al=SSL_AD_UNEXPECTED_MESSAGE;
2306                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2307                 goto f_err;
2308                 }
2309         if (n < 6)
2310                 {
2311                 /* need at least ticket_lifetime_hint + ticket length */
2312                 al = SSL_AD_DECODE_ERROR;
2313                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2314                 goto f_err;
2315                 }
2316
2317         p=d=(unsigned char *)s->init_msg;
2318         n2l(p, s->session->tlsext_tick_lifetime_hint);
2319         n2s(p, ticklen);
2320         /* ticket_lifetime_hint + ticket_length + ticket */
2321         if (ticklen + 6 != n)
2322                 {
2323                 al = SSL_AD_DECODE_ERROR;
2324                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2325                 goto f_err;
2326                 }
2327         if (s->session->tlsext_tick)
2328                 {
2329                 OPENSSL_free(s->session->tlsext_tick);
2330                 s->session->tlsext_ticklen = 0;
2331                 }
2332         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2333         if (!s->session->tlsext_tick)
2334                 {
2335                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2336                 goto err;
2337                 }
2338         memcpy(s->session->tlsext_tick, p, ticklen);
2339         s->session->tlsext_ticklen = ticklen;
2340         /* There are two ways to detect a resumed ticket session.
2341          * One is to set an appropriate session ID and then the server
2342          * must return a match in ServerHello. This allows the normal
2343          * client session ID matching to work and we know much
2344          * earlier that the ticket has been accepted.
2345          *
2346          * The other way is to set zero length session ID when the
2347          * ticket is presented and rely on the handshake to determine
2348          * session resumption.
2349          *
2350          * We choose the former approach because this fits in with
2351          * assumptions elsewhere in OpenSSL. The session ID is set
2352          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2353          * ticket.
2354          */
2355         EVP_Digest(p, ticklen,
2356                         s->session->session_id, &s->session->session_id_length,
2357 #ifndef OPENSSL_NO_SHA256
2358                                                         EVP_sha256(), NULL);
2359 #else
2360                                                         EVP_sha1(), NULL);
2361 #endif
2362         ret=1;
2363         return(ret);
2364 f_err:
2365         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2366 err:
2367         return(-1);
2368         }
2369
2370 int ssl3_get_cert_status(SSL *s)
2371         {
2372         int ok, al;
2373         unsigned long resplen,n;
2374         const unsigned char *p;
2375
2376         n=s->method->ssl_get_message(s,
2377                 SSL3_ST_CR_CERT_STATUS_A,
2378                 SSL3_ST_CR_CERT_STATUS_B,
2379                 SSL3_MT_CERTIFICATE_STATUS,
2380                 16384,
2381                 &ok);
2382
2383         if (!ok) return((int)n);
2384         if (n < 4)
2385                 {
2386                 /* need at least status type + length */
2387                 al = SSL_AD_DECODE_ERROR;
2388                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2389                 goto f_err;
2390                 }
2391         p = (unsigned char *)s->init_msg;
2392         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2393                 {
2394                 al = SSL_AD_DECODE_ERROR;
2395                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2396                 goto f_err;
2397                 }
2398         n2l3(p, resplen);
2399         if (resplen + 4 != n)
2400                 {
2401                 al = SSL_AD_DECODE_ERROR;
2402                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2403                 goto f_err;
2404                 }
2405         if (s->tlsext_ocsp_resp)
2406                 OPENSSL_free(s->tlsext_ocsp_resp);
2407         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2408         if (!s->tlsext_ocsp_resp)
2409                 {
2410                 al = SSL_AD_INTERNAL_ERROR;
2411                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2412                 goto f_err;
2413                 }
2414         s->tlsext_ocsp_resplen = resplen;
2415         if (s->ctx->tlsext_status_cb)
2416                 {
2417                 int ret;
2418                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2419                 if (ret == 0)
2420                         {
2421                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2422                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2423                         goto f_err;
2424                         }
2425                 if (ret < 0)
2426                         {
2427                         al = SSL_AD_INTERNAL_ERROR;
2428                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2429                         goto f_err;
2430                         }
2431                 }
2432         return 1;
2433 f_err:
2434         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2435         return(-1);
2436         }
2437 #endif
2438
2439 int ssl3_get_server_done(SSL *s)
2440         {
2441         int ok,ret=0;
2442         long n;
2443
2444         n=s->method->ssl_get_message(s,
2445                 SSL3_ST_CR_SRVR_DONE_A,
2446                 SSL3_ST_CR_SRVR_DONE_B,
2447                 SSL3_MT_SERVER_DONE,
2448                 30, /* should be very small, like 0 :-) */
2449                 &ok);
2450
2451         if (!ok) return((int)n);
2452         if (n > 0)
2453                 {
2454                 /* should contain no data */
2455                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2456                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2457                 return -1;
2458                 }
2459         ret=1;
2460         return(ret);
2461         }
2462
2463
2464 int ssl3_send_client_key_exchange(SSL *s)
2465         {
2466         unsigned char *p;
2467         int n;
2468         unsigned long alg_k;
2469 #ifndef OPENSSL_NO_RSA
2470         unsigned char *q;
2471         EVP_PKEY *pkey=NULL;
2472 #endif
2473 #ifndef OPENSSL_NO_KRB5
2474         KSSL_ERR kssl_err;
2475 #endif /* OPENSSL_NO_KRB5 */
2476 #ifndef OPENSSL_NO_ECDH
2477         EC_KEY *clnt_ecdh = NULL;
2478         const EC_POINT *srvr_ecpoint = NULL;
2479         EVP_PKEY *srvr_pub_pkey = NULL;
2480         unsigned char *encodedPoint = NULL;
2481         int encoded_pt_len = 0;
2482         BN_CTX * bn_ctx = NULL;
2483 #endif
2484
2485         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2486                 {
2487                 p = ssl_handshake_start(s);
2488
2489                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2490
2491                 /* Fool emacs indentation */
2492                 if (0) {}
2493 #ifndef OPENSSL_NO_RSA
2494                 else if (alg_k & SSL_kRSA)
2495                         {
2496                         RSA *rsa;
2497                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2498
2499                         if (s->session->sess_cert == NULL)
2500                                 {
2501                                 /* We should always have a server certificate with SSL_kRSA. */
2502                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2503                                 goto err;
2504                                 }
2505
2506                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2507                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2508                         else
2509                                 {
2510                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2511                                 if ((pkey == NULL) ||
2512                                         (pkey->type != EVP_PKEY_RSA) ||
2513                                         (pkey->pkey.rsa == NULL))
2514                                         {
2515                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2516                                         goto err;
2517                                         }
2518                                 rsa=pkey->pkey.rsa;
2519                                 EVP_PKEY_free(pkey);
2520                                 }
2521
2522                         tmp_buf[0]=s->client_version>>8;
2523                         tmp_buf[1]=s->client_version&0xff;
2524                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2525                                         goto err;
2526
2527                         s->session->master_key_length=sizeof tmp_buf;
2528
2529                         q=p;
2530                         /* Fix buf for TLS and beyond */
2531                         if (s->version > SSL3_VERSION)
2532                                 p+=2;
2533                         n=RSA_public_encrypt(sizeof tmp_buf,
2534                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2535 #ifdef PKCS1_CHECK
2536                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2537                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2538 #endif
2539                         if (n <= 0)
2540                                 {
2541                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2542                                 goto err;
2543                                 }
2544
2545                         /* Fix buf for TLS and beyond */
2546                         if (s->version > SSL3_VERSION)
2547                                 {
2548                                 s2n(n,q);
2549                                 n+=2;
2550                                 }
2551
2552                         s->session->master_key_length=
2553                                 s->method->ssl3_enc->generate_master_secret(s,
2554                                         s->session->master_key,
2555                                         tmp_buf,sizeof tmp_buf);
2556                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2557                         }
2558 #endif
2559 #ifndef OPENSSL_NO_KRB5
2560                 else if (alg_k & SSL_kKRB5)
2561                         {
2562                         krb5_error_code krb5rc;
2563                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2564                         /*  krb5_data   krb5_ap_req;  */
2565                         krb5_data       *enc_ticket;
2566                         krb5_data       authenticator, *authp = NULL;
2567                         EVP_CIPHER_CTX  ciph_ctx;
2568                         const EVP_CIPHER *enc = NULL;
2569                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2570                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2571                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2572                                                 + EVP_MAX_IV_LENGTH];
2573                         int             padl, outl = sizeof(epms);
2574
2575                         EVP_CIPHER_CTX_init(&ciph_ctx);
2576
2577 #ifdef KSSL_DEBUG
2578                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2579                                 alg_k, SSL_kKRB5);
2580 #endif  /* KSSL_DEBUG */
2581
2582                         authp = NULL;
2583 #ifdef KRB5SENDAUTH
2584                         if (KRB5SENDAUTH)  authp = &authenticator;
2585 #endif  /* KRB5SENDAUTH */
2586
2587                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2588                                 &kssl_err);
2589                         enc = kssl_map_enc(kssl_ctx->enctype);
2590                         if (enc == NULL)
2591                             goto err;
2592 #ifdef KSSL_DEBUG
2593                         {
2594                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2595                         if (krb5rc && kssl_err.text)
2596                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2597                         }
2598 #endif  /* KSSL_DEBUG */
2599
2600                         if (krb5rc)
2601                                 {
2602                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2603                                                 SSL_AD_HANDSHAKE_FAILURE);
2604                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2605                                                 kssl_err.reason);
2606                                 goto err;
2607                                 }
2608
2609                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2610                         **  in place of RFC 2712 KerberosWrapper, as in:
2611                         **
2612                         **  Send ticket (copy to *p, set n = length)
2613                         **  n = krb5_ap_req.length;
2614                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2615                         **  if (krb5_ap_req.data)
2616                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2617                         **
2618                         **  Now using real RFC 2712 KerberosWrapper
2619                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2620                         **  Note: 2712 "opaque" types are here replaced
2621                         **  with a 2-byte length followed by the value.
2622                         **  Example:
2623                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2624                         **  Where "xx xx" = length bytes.  Shown here with
2625                         **  optional authenticator omitted.
2626                         */
2627
2628                         /*  KerberosWrapper.Ticket              */
2629                         s2n(enc_ticket->length,p);
2630                         memcpy(p, enc_ticket->data, enc_ticket->length);
2631                         p+= enc_ticket->length;
2632                         n = enc_ticket->length + 2;
2633
2634                         /*  KerberosWrapper.Authenticator       */
2635                         if (authp  &&  authp->length)
2636                                 {
2637                                 s2n(authp->length,p);
2638                                 memcpy(p, authp->data, authp->length);
2639                                 p+= authp->length;
2640                                 n+= authp->length + 2;
2641
2642                                 free(authp->data);
2643                                 authp->data = NULL;
2644                                 authp->length = 0;
2645                                 }
2646                         else
2647                                 {
2648                                 s2n(0,p);/*  null authenticator length  */
2649                                 n+=2;
2650                                 }
2651
2652                             tmp_buf[0]=s->client_version>>8;
2653                             tmp_buf[1]=s->client_version&0xff;
2654                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2655                                 goto err;
2656
2657                         /*  20010420 VRS.  Tried it this way; failed.
2658                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2659                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2660                         **                              kssl_ctx->length);
2661                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2662                         */
2663
2664                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2665                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2666                                 kssl_ctx->key,iv);
2667                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2668                                 sizeof tmp_buf);
2669                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2670                         outl += padl;
2671                         if (outl > (int)sizeof epms)
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2674                                 goto err;
2675                                 }
2676                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2677
2678                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2679                         s2n(outl,p);
2680                         memcpy(p, epms, outl);
2681                         p+=outl;
2682                         n+=outl + 2;
2683
2684                         s->session->master_key_length=
2685                                 s->method->ssl3_enc->generate_master_secret(s,
2686                                         s->session->master_key,
2687                                         tmp_buf, sizeof tmp_buf);
2688
2689                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2690                         OPENSSL_cleanse(epms, outl);
2691                         }
2692 #endif
2693 #ifndef OPENSSL_NO_DH
2694                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2695                         {
2696                         DH *dh_srvr,*dh_clnt;
2697                         SESS_CERT *scert = s->session->sess_cert;
2698
2699                         if (scert == NULL)
2700                                 {
2701                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2702                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2703                                 goto err;
2704                                 }
2705
2706                         if (scert->peer_dh_tmp != NULL)
2707                                 dh_srvr=scert->peer_dh_tmp;
2708                         else
2709                                 {
2710                                 /* we get them from the cert */
2711                                 int idx = scert->peer_cert_type;
2712                                 EVP_PKEY *spkey = NULL;
2713                                 dh_srvr = NULL;
2714                                 if (idx >= 0)
2715                                         spkey = X509_get_pubkey(
2716                                                 scert->peer_pkeys[idx].x509);
2717                                 if (spkey)
2718                                         {
2719                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2720                                         EVP_PKEY_free(spkey);
2721                                         }
2722                                 if (dh_srvr == NULL)
2723                                         {
2724                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2725                                             ERR_R_INTERNAL_ERROR);
2726                                         goto err;
2727                                         }
2728                                 }
2729                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2730                                 {
2731                                 /* Use client certificate key */
2732                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2733                                 dh_clnt = NULL;
2734                                 if (clkey)
2735                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2736                                 if (dh_clnt == NULL)
2737                                         {
2738                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2739                                             ERR_R_INTERNAL_ERROR);
2740                                         goto err;
2741                                         }
2742                                 }
2743                         else
2744                                 {
2745                                 /* generate a new random key */
2746                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2747                                         {
2748                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2749                                         goto err;
2750                                         }
2751                                 if (!DH_generate_key(dh_clnt))
2752                                         {
2753                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2754                                         DH_free(dh_clnt);
2755                                         goto err;
2756                                         }
2757                                 }
2758
2759                         /* use the 'p' output buffer for the DH key, but
2760                          * make sure to clear it out afterwards */
2761
2762                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2763                         if (scert->peer_dh_tmp == NULL)
2764                                 DH_free(dh_srvr);
2765
2766                         if (n <= 0)
2767                                 {
2768                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2769                                 DH_free(dh_clnt);
2770                                 goto err;
2771                                 }
2772
2773                         /* generate master key from the result */
2774                         s->session->master_key_length=
2775                                 s->method->ssl3_enc->generate_master_secret(s,
2776                                         s->session->master_key,p,n);
2777                         /* clean up */
2778                         memset(p,0,n);
2779
2780                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2781                                 n = 0;
2782                         else
2783                                 {
2784                                 /* send off the data */
2785                                 n=BN_num_bytes(dh_clnt->pub_key);
2786                                 s2n(n,p);
2787                                 BN_bn2bin(dh_clnt->pub_key,p);
2788                                 n+=2;
2789                                 }
2790
2791                         DH_free(dh_clnt);
2792
2793                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2794                         }
2795 #endif
2796
2797 #ifndef OPENSSL_NO_ECDH
2798                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2799                         {
2800                         const EC_GROUP *srvr_group = NULL;
2801                         EC_KEY *tkey;
2802                         int ecdh_clnt_cert = 0;
2803                         int field_size = 0;
2804
2805                         if (s->session->sess_cert == NULL)
2806                                 {
2807                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2808                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2809                                 goto err;
2810                                 }
2811
2812                         /* Did we send out the client's
2813                          * ECDH share for use in premaster
2814                          * computation as part of client certificate?
2815                          * If so, set ecdh_clnt_cert to 1.
2816                          */
2817                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2818                                 {
2819                                 /* XXX: For now, we do not support client
2820                                  * authentication using ECDH certificates.
2821                                  * To add such support, one needs to add
2822                                  * code that checks for appropriate
2823                                  * conditions and sets ecdh_clnt_cert to 1.
2824                                  * For example, the cert have an ECC
2825                                  * key on the same curve as the server's
2826                                  * and the key should be authorized for
2827                                  * key agreement.
2828                                  *
2829                                  * One also needs to add code in ssl3_connect
2830                                  * to skip sending the certificate verify
2831                                  * message.
2832                                  *
2833                                  * if ((s->cert->key->privatekey != NULL) &&
2834                                  *     (s->cert->key->privatekey->type ==
2835                                  *      EVP_PKEY_EC) && ...)
2836                                  * ecdh_clnt_cert = 1;
2837                                  */
2838                                 }
2839
2840                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2841                                 {
2842                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2843                                 }
2844                         else
2845                                 {
2846                                 /* Get the Server Public Key from Cert */
2847                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2848                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2849                                 if ((srvr_pub_pkey == NULL) ||
2850                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2851                                     (srvr_pub_pkey->pkey.ec == NULL))
2852                                         {
2853                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2854                                             ERR_R_INTERNAL_ERROR);
2855                                         goto err;
2856                                         }
2857
2858                                 tkey = srvr_pub_pkey->pkey.ec;
2859                                 }
2860
2861                         srvr_group   = EC_KEY_get0_group(tkey);
2862                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2863
2864                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2865                                 {
2866                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2867                                     ERR_R_INTERNAL_ERROR);
2868                                 goto err;
2869                                 }
2870
2871                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2874                                 goto err;
2875                                 }
2876
2877                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2878                                 {
2879                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2880                                 goto err;
2881                                 }
2882                         if (ecdh_clnt_cert)
2883                                 {
2884                                 /* Reuse key info from our certificate
2885                                  * We only need our private key to perform
2886                                  * the ECDH computation.
2887                                  */
2888                                 const BIGNUM *priv_key;
2889                                 tkey = s->cert->key->privatekey->pkey.ec;
2890                                 priv_key = EC_KEY_get0_private_key(tkey);
2891                                 if (priv_key == NULL)
2892                                         {
2893                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2894                                         goto err;
2895                                         }
2896                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2897                                         {
2898                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2899                                         goto err;
2900                                         }
2901                                 }
2902                         else
2903                                 {
2904                                 /* Generate a new ECDH key pair */
2905                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2906                                         {
2907                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2908                                         goto err;
2909                                         }
2910                                 }
2911
2912                         /* use the 'p' output buffer for the ECDH key, but
2913                          * make sure to clear it out afterwards
2914                          */
2915
2916                         field_size = EC_GROUP_get_degree(srvr_group);
2917                         if (field_size <= 0)
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2920                                        ERR_R_ECDH_LIB);
2921                                 goto err;
2922                                 }
2923                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2924                         if (n <= 0)
2925                                 {
2926                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2927                                        ERR_R_ECDH_LIB);
2928                                 goto err;
2929                                 }
2930
2931                         /* generate master key from the result */
2932                         s->session->master_key_length = s->method->ssl3_enc \
2933                             -> generate_master_secret(s,
2934                                 s->session->master_key,
2935                                 p, n);
2936
2937                         memset(p, 0, n); /* clean up */
2938
2939                         if (ecdh_clnt_cert)
2940                                 {
2941                                 /* Send empty client key exch message */
2942                                 n = 0;
2943                                 }
2944                         else
2945                                 {
2946                                 /* First check the size of encoding and
2947                                  * allocate memory accordingly.
2948                                  */
2949                                 encoded_pt_len =
2950                                     EC_POINT_point2oct(srvr_group,
2951                                         EC_KEY_get0_public_key(clnt_ecdh),
2952                                         POINT_CONVERSION_UNCOMPRESSED,
2953                                         NULL, 0, NULL);
2954
2955                                 encodedPoint = (unsigned char *)
2956                                     OPENSSL_malloc(encoded_pt_len *
2957                                         sizeof(unsigned char));
2958                                 bn_ctx = BN_CTX_new();
2959                                 if ((encodedPoint == NULL) ||
2960                                     (bn_ctx == NULL))
2961                                         {
2962                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2963                                         goto err;
2964                                         }
2965
2966                                 /* Encode the public key */
2967                                 n = EC_POINT_point2oct(srvr_group,
2968                                     EC_KEY_get0_public_key(clnt_ecdh),
2969                                     POINT_CONVERSION_UNCOMPRESSED,
2970                                     encodedPoint, encoded_pt_len, bn_ctx);
2971
2972                                 *p = n; /* length of encoded point */
2973                                 /* Encoded point will be copied here */
2974                                 p += 1;
2975                                 /* copy the point */
2976                                 memcpy((unsigned char *)p, encodedPoint, n);
2977                                 /* increment n to account for length field */
2978                                 n += 1;
2979                                 }
2980
2981                         /* Free allocated memory */
2982                         BN_CTX_free(bn_ctx);
2983                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2984                         if (clnt_ecdh != NULL)
2985                                  EC_KEY_free(clnt_ecdh);
2986                         EVP_PKEY_free(srvr_pub_pkey);
2987                         }
2988 #endif /* !OPENSSL_NO_ECDH */
2989                 else if (alg_k & SSL_kGOST)
2990                         {
2991                         /* GOST key exchange message creation */
2992                         EVP_PKEY_CTX *pkey_ctx;
2993                         X509 *peer_cert;
2994                         size_t msglen;
2995                         unsigned int md_len;
2996                         int keytype;
2997                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2998                         EVP_MD_CTX *ukm_hash;
2999                         EVP_PKEY *pub_key;
3000
3001                         /* Get server sertificate PKEY and create ctx from it */
3002                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
3003                         if (!peer_cert)
3004                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
3005                         if (!peer_cert)         {
3006                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
3007                                         goto err;
3008                                 }
3009
3010                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
3011                         /* If we have send a certificate, and certificate key
3012
3013                          * parameters match those of server certificate, use
3014                          * certificate key for key exchange
3015                          */
3016
3017                          /* Otherwise, generate ephemeral key pair */
3018
3019                         EVP_PKEY_encrypt_init(pkey_ctx);
3020                           /* Generate session key */
3021                     RAND_bytes(premaster_secret,32);
3022                         /* If we have client certificate, use its secret as peer key */
3023                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3024                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3025                                         /* If there was an error - just ignore it. Ephemeral key
3026                                         * would be used
3027                                         */
3028                                         ERR_clear_error();
3029                                 }
3030                         }
3031                         /* Compute shared IV and store it in algorithm-specific
3032                          * context data */
3033                         ukm_hash = EVP_MD_CTX_create();
3034                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3035                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3036                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3037                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3038                         EVP_MD_CTX_destroy(ukm_hash);
3039                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3040                                 8,shared_ukm)<0) {
3041                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3042                                                 SSL_R_LIBRARY_BUG);
3043                                         goto err;
3044                                 }
3045                         /* Make GOST keytransport blob message */
3046                         /*Encapsulate it into sequence */
3047                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3048                         msglen=255;
3049                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3050                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3051                                         SSL_R_LIBRARY_BUG);
3052                                 goto err;
3053                         }
3054                         if (msglen >= 0x80)
3055                                 {
3056                                 *(p++)=0x81;
3057                                 *(p++)= msglen & 0xff;
3058                                 n=msglen+3;
3059                                 }
3060                         else
3061                                 {
3062                                 *(p++)= msglen & 0xff;
3063                                 n=msglen+2;
3064                                 }
3065                         memcpy(p, tmp, msglen);
3066                         /* Check if pubkey from client certificate was used */
3067                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3068                                 {
3069                                 /* Set flag "skip certificate verify" */
3070                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3071                                 }
3072                         EVP_PKEY_CTX_free(pkey_ctx);
3073                         s->session->master_key_length=
3074                                 s->method->ssl3_enc->generate_master_secret(s,
3075                                         s->session->master_key,premaster_secret,32);
3076                         EVP_PKEY_free(pub_key);
3077
3078                         }
3079 #ifndef OPENSSL_NO_SRP
3080                 else if (alg_k & SSL_kSRP)
3081                         {
3082                         if (s->srp_ctx.A != NULL)
3083                                 {
3084                                 /* send off the data */
3085                                 n=BN_num_bytes(s->srp_ctx.A);
3086                                 s2n(n,p);
3087                                 BN_bn2bin(s->srp_ctx.A,p);
3088                                 n+=2;
3089                                 }
3090                         else
3091                                 {
3092                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3093                                 goto err;
3094                                 }
3095                         if (s->session->srp_username != NULL)
3096                                 OPENSSL_free(s->session->srp_username);
3097                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3098                         if (s->session->srp_username == NULL)
3099                                 {
3100                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3101                                         ERR_R_MALLOC_FAILURE);
3102                                 goto err;
3103                                 }
3104
3105                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3106                                 {
3107                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3108                                 goto err;
3109                                 }
3110                         }
3111 #endif
3112 #ifndef OPENSSL_NO_PSK
3113                 else if (alg_k & SSL_kPSK)
3114                         {
3115                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3116                          * to return a \0-terminated identity. The last byte
3117                          * is for us for simulating strnlen. */
3118                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3119                         size_t identity_len;
3120                         unsigned char *t = NULL;
3121                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3122                         unsigned int pre_ms_len = 0, psk_len = 0;
3123                         int psk_err = 1;
3124
3125                         n = 0;
3126                         if (s->psk_client_callback == NULL)
3127                                 {
3128                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3129                                         SSL_R_PSK_NO_CLIENT_CB);
3130                                 goto err;
3131                                 }
3132
3133                         memset(identity, 0, sizeof(identity));
3134                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3135                                 identity, sizeof(identity) - 1,
3136                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3137                         if (psk_len > PSK_MAX_PSK_LEN)
3138                                 {
3139                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3140                                         ERR_R_INTERNAL_ERROR);
3141                                 goto psk_err;
3142                                 }
3143                         else if (psk_len == 0)
3144                                 {
3145                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3146                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3147                                 goto psk_err;
3148                                 }
3149                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3150                         identity_len = strlen(identity);
3151                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3152                                 {
3153                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3154                                         ERR_R_INTERNAL_ERROR);
3155                                 goto psk_err;
3156                                 }
3157                         /* create PSK pre_master_secret */
3158                         pre_ms_len = 2+psk_len+2+psk_len;
3159                         t = psk_or_pre_ms;
3160                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3161                         s2n(psk_len, t);
3162                         memset(t, 0, psk_len);
3163                         t+=psk_len;
3164                         s2n(psk_len, t);
3165
3166                         if (s->session->psk_identity_hint != NULL)
3167                                 OPENSSL_free(s->session->psk_identity_hint);
3168                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3169                         if (s->ctx->psk_identity_hint != NULL &&
3170                                 s->session->psk_identity_hint == NULL)
3171                                 {
3172                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3173                                         ERR_R_MALLOC_FAILURE);
3174                                 goto psk_err;
3175                                 }
3176
3177                         if (s->session->psk_identity != NULL)
3178                                 OPENSSL_free(s->session->psk_identity);
3179                         s->session->psk_identity = BUF_strdup(identity);
3180                         if (s->session->psk_identity == NULL)
3181                                 {
3182                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3183                                         ERR_R_MALLOC_FAILURE);
3184                                 goto psk_err;
3185                                 }
3186
3187                         s->session->master_key_length =
3188                                 s->method->ssl3_enc->generate_master_secret(s,
3189                                         s->session->master_key,
3190                                         psk_or_pre_ms, pre_ms_len);
3191                         s2n(identity_len, p);
3192                         memcpy(p, identity, identity_len);
3193                         n = 2 + identity_len;
3194                         psk_err = 0;
3195                 psk_err:
3196                         OPENSSL_cleanse(identity, sizeof(identity));
3197                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3198                         if (psk_err != 0)
3199                                 {
3200                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3201                                 goto err;
3202                                 }
3203                         }
3204 #endif
3205                 else
3206                         {
3207                         ssl3_send_alert(s, SSL3_AL_FATAL,
3208                             SSL_AD_HANDSHAKE_FAILURE);
3209                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3210                             ERR_R_INTERNAL_ERROR);
3211                         goto err;
3212                         }
3213
3214                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3215                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3216                 }
3217
3218         /* SSL3_ST_CW_KEY_EXCH_B */
3219         return ssl_do_write(s);
3220 err:
3221 #ifndef OPENSSL_NO_ECDH
3222         BN_CTX_free(bn_ctx);
3223         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3224         if (clnt_ecdh != NULL)
3225                 EC_KEY_free(clnt_ecdh);
3226         EVP_PKEY_free(srvr_pub_pkey);
3227 #endif
3228         return(-1);
3229         }
3230
3231 int ssl3_send_client_verify(SSL *s)
3232         {
3233         unsigned char *p;
3234         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3235         EVP_PKEY *pkey;
3236         EVP_PKEY_CTX *pctx=NULL;
3237         EVP_MD_CTX mctx;
3238         unsigned u=0;
3239         unsigned long n;
3240         int j;
3241
3242         EVP_MD_CTX_init(&mctx);
3243
3244         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3245                 {
3246                 p= ssl_handshake_start(s);
3247                 pkey=s->cert->key->privatekey;
3248 /* Create context from key and test if sha1 is allowed as digest */
3249                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3250                 EVP_PKEY_sign_init(pctx);
3251                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3252                         {
3253                         if (!SSL_USE_SIGALGS(s))
3254                                 s->method->ssl3_enc->cert_verify_mac(s,
3255                                                 NID_sha1,
3256                                                 &(data[MD5_DIGEST_LENGTH]));
3257                         }
3258                 else
3259                         {
3260                         ERR_clear_error();
3261                         }
3262                 /* For TLS v1.2 send signature algorithm and signature
3263                  * using agreed digest and cached handshake records.
3264                  */
3265                 if (SSL_USE_SIGALGS(s))
3266                         {
3267                         long hdatalen = 0;
3268                         void *hdata;
3269                         const EVP_MD *md = s->cert->key->digest;
3270                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3271                                                                 &hdata);
3272                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3273                                 {
3274                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3275                                                 ERR_R_INTERNAL_ERROR);
3276                                 goto err;
3277                                 }
3278                         p += 2;
3279 #ifdef SSL_DEBUG
3280                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3281                                                         EVP_MD_name(md));
3282 #endif
3283                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3284                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3285                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3286                                 {
3287                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3288                                                 ERR_R_EVP_LIB);
3289                                 goto err;
3290                                 }
3291                         s2n(u,p);
3292                         n = u + 4;
3293                         if (!ssl3_digest_cached_records(s))
3294                                 goto err;
3295                         }
3296                 else
3297 #ifndef OPENSSL_NO_RSA
3298                 if (pkey->type == EVP_PKEY_RSA)
3299                         {
3300                         s->method->ssl3_enc->cert_verify_mac(s,
3301                                 NID_md5,
3302                                 &(data[0]));
3303                         if (RSA_sign(NID_md5_sha1, data,
3304                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3305                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3306                                 {
3307                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3308                                 goto err;
3309                                 }
3310                         s2n(u,p);
3311                         n=u+2;
3312                         }
3313                 else
3314 #endif
3315 #ifndef OPENSSL_NO_DSA
3316                         if (pkey->type == EVP_PKEY_DSA)
3317                         {
3318                         if (!DSA_sign(pkey->save_type,
3319                                 &(data[MD5_DIGEST_LENGTH]),
3320                                 SHA_DIGEST_LENGTH,&(p[2]),
3321                                 (unsigned int *)&j,pkey->pkey.dsa))
3322                                 {
3323                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3324                                 goto err;
3325                                 }
3326                         s2n(j,p);
3327                         n=j+2;
3328                         }
3329                 else
3330 #endif
3331 #ifndef OPENSSL_NO_ECDSA
3332                         if (pkey->type == EVP_PKEY_EC)
3333                         {
3334                         if (!ECDSA_sign(pkey->save_type,
3335                                 &(data[MD5_DIGEST_LENGTH]),
3336                                 SHA_DIGEST_LENGTH,&(p[2]),
3337                                 (unsigned int *)&j,pkey->pkey.ec))
3338                                 {
3339                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3340                                     ERR_R_ECDSA_LIB);
3341                                 goto err;
3342                                 }
3343                         s2n(j,p);
3344                         n=j+2;
3345                         }
3346                 else
3347 #endif
3348                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3349                 {
3350                 unsigned char signbuf[64];
3351                 int i;
3352                 size_t sigsize=64;
3353                 s->method->ssl3_enc->cert_verify_mac(s,
3354                         NID_id_GostR3411_94,
3355                         data);
3356                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3357                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3358                         ERR_R_INTERNAL_ERROR);
3359                         goto err;
3360                 }
3361                 for (i=63,j=0; i>=0; j++, i--) {
3362                         p[2+j]=signbuf[i];
3363                 }
3364                 s2n(j,p);
3365                 n=j+2;
3366                 }
3367                 else
3368                 {
3369                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3370                         goto err;
3371                 }
3372                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3373                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3374                 }
3375         EVP_MD_CTX_cleanup(&mctx);
3376         EVP_PKEY_CTX_free(pctx);
3377         return ssl_do_write(s);
3378 err:
3379         EVP_MD_CTX_cleanup(&mctx);
3380         EVP_PKEY_CTX_free(pctx);
3381         return(-1);
3382         }
3383
3384 /* Check a certificate can be used for client authentication. Currently
3385  * check cert exists, if we have a suitable digest for TLS 1.2 if
3386  * static DH client certificates can be used and optionally checks
3387  * suitability for Suite B.
3388  */
3389 static int ssl3_check_client_certificate(SSL *s)
3390         {
3391         unsigned long alg_k;
3392         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3393                 return 0;
3394         /* If no suitable signature algorithm can't use certificate */
3395         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3396                 return 0;
3397         /* If strict mode check suitability of chain before using it.
3398          * This also adjusts suite B digest if necessary.
3399          */
3400         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3401                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3402                 return 0;
3403         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3404         /* See if we can use client certificate for fixed DH */
3405         if (alg_k & (SSL_kDHr|SSL_kDHd))
3406                 {
3407                 SESS_CERT *scert = s->session->sess_cert;
3408                 int i = scert->peer_cert_type;
3409                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3410                 clkey = s->cert->key->privatekey;
3411                 /* If client key not DH assume it can be used */
3412                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3413                         return 1;
3414                 if (i >= 0)
3415                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3416                 if (spkey)
3417                         {
3418                         /* Compare server and client parameters */
3419                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3420                         EVP_PKEY_free(spkey);
3421                         if (i != 1)
3422                                 return 0;
3423                         }
3424                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3425                 }
3426         return 1;
3427         }
3428
3429 int ssl3_send_client_certificate(SSL *s)
3430         {
3431         X509 *x509=NULL;
3432         EVP_PKEY *pkey=NULL;
3433         int i;
3434
3435         if (s->state == SSL3_ST_CW_CERT_A)
3436                 {
3437                 /* Let cert callback update client certificates if required */
3438                 if (s->cert->cert_cb)
3439                         {
3440                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3441                         if (i < 0)
3442                                 {
3443                                 s->rwstate=SSL_X509_LOOKUP;
3444                                 return -1;
3445                                 }
3446                         if (i == 0)
3447                                 {
3448                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3449                                 return 0;
3450                                 }
3451                         s->rwstate=SSL_NOTHING;
3452                         }
3453                 if (ssl3_check_client_certificate(s))
3454                         s->state=SSL3_ST_CW_CERT_C;
3455                 else
3456                         s->state=SSL3_ST_CW_CERT_B;
3457                 }
3458
3459         /* We need to get a client cert */
3460         if (s->state == SSL3_ST_CW_CERT_B)
3461                 {
3462                 /* If we get an error, we need to
3463                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3464                  * We then get retied later */
3465                 i=0;
3466                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3467                 if (i < 0)
3468                         {
3469                         s->rwstate=SSL_X509_LOOKUP;
3470                         return(-1);
3471                         }
3472                 s->rwstate=SSL_NOTHING;
3473                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3474                         {
3475                         s->state=SSL3_ST_CW_CERT_B;
3476                         if (    !SSL_use_certificate(s,x509) ||
3477                                 !SSL_use_PrivateKey(s,pkey))
3478                                 i=0;
3479                         }
3480                 else if (i == 1)
3481                         {
3482                         i=0;
3483                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3484                         }
3485
3486                 if (x509 != NULL) X509_free(x509);
3487                 if (pkey != NULL) EVP_PKEY_free(pkey);
3488                 if (i && !ssl3_check_client_certificate(s))
3489                         i = 0;
3490                 if (i == 0)
3491                         {
3492                         if (s->version == SSL3_VERSION)
3493                                 {
3494                                 s->s3->tmp.cert_req=0;
3495                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3496                                 return(1);
3497                                 }
3498                         else
3499                                 {
3500                                 s->s3->tmp.cert_req=2;
3501                                 }
3502                         }
3503
3504                 /* Ok, we have a cert */
3505                 s->state=SSL3_ST_CW_CERT_C;
3506                 }
3507
3508         if (s->state == SSL3_ST_CW_CERT_C)
3509                 {
3510                 s->state=SSL3_ST_CW_CERT_D;
3511                 ssl3_output_cert_chain(s,
3512                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3513                 }
3514         /* SSL3_ST_CW_CERT_D */
3515         return ssl_do_write(s);
3516         }
3517
3518 #define has_bits(i,m)   (((i)&(m)) == (m))
3519
3520 int ssl3_check_cert_and_algorithm(SSL *s)
3521         {
3522         int i,idx;
3523         long alg_k,alg_a;
3524         EVP_PKEY *pkey=NULL;
3525         SESS_CERT *sc;
3526 #ifndef OPENSSL_NO_RSA
3527         RSA *rsa;
3528 #endif
3529 #ifndef OPENSSL_NO_DH
3530         DH *dh;
3531 #endif
3532
3533         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3534         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3535
3536         /* we don't have a certificate */
3537         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3538                 return(1);
3539
3540         sc=s->session->sess_cert;
3541         if (sc == NULL)
3542                 {
3543                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3544                 goto err;
3545                 }
3546
3547 #ifndef OPENSSL_NO_RSA
3548         rsa=s->session->sess_cert->peer_rsa_tmp;
3549 #endif
3550 #ifndef OPENSSL_NO_DH
3551         dh=s->session->sess_cert->peer_dh_tmp;
3552 #endif
3553
3554         /* This is the passed certificate */
3555
3556         idx=sc->peer_cert_type;
3557 #ifndef OPENSSL_NO_ECDH
3558         if (idx == SSL_PKEY_ECC)
3559                 {
3560                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3561                                                                 s) == 0)
3562                         { /* check failed */
3563                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3564                         goto f_err;
3565                         }
3566                 else
3567                         {
3568                         return 1;
3569                         }
3570                 }
3571         else if (alg_a & SSL_aECDSA)
3572                 {
3573                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3574                 goto f_err;
3575                 }
3576         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3577                 {
3578                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3579                 goto f_err;
3580                 }
3581 #endif
3582         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3583         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3584         EVP_PKEY_free(pkey);
3585
3586
3587         /* Check that we have a certificate if we require one */
3588         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3589                 {
3590                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3591                 goto f_err;
3592                 }
3593 #ifndef OPENSSL_NO_DSA
3594         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3595                 {
3596                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3597                 goto f_err;
3598                 }
3599 #endif
3600 #ifndef OPENSSL_NO_RSA
3601         if ((alg_k & SSL_kRSA) &&
3602                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3603                 {
3604                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3605                 goto f_err;
3606                 }
3607 #endif
3608 #ifndef OPENSSL_NO_DH
3609         if ((alg_k & SSL_kEDH) &&
3610                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3611                 {
3612                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3613                 goto f_err;
3614                 }
3615         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3616                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3617                 {
3618                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3619                 goto f_err;
3620                 }
3621 #ifndef OPENSSL_NO_DSA
3622         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3623                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3624                 {
3625                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3626                 goto f_err;
3627                 }
3628 #endif
3629 #endif
3630
3631         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3632                 {
3633 #ifndef OPENSSL_NO_RSA
3634                 if (alg_k & SSL_kRSA)
3635                         {
3636                         if (rsa == NULL
3637                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3638                                 {
3639                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3640                                 goto f_err;
3641                                 }
3642                         }
3643                 else
3644 #endif
3645 #ifndef OPENSSL_NO_DH
3646                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3647                             {
3648                             if (dh == NULL
3649                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3650                                 {
3651                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3652                                 goto f_err;
3653                                 }
3654                         }
3655                 else
3656 #endif
3657                         {
3658                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3659                         goto f_err;
3660                         }
3661                 }
3662         return(1);
3663 f_err:
3664         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3665 err:
3666         return(0);
3667         }
3668
3669 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3670 int ssl3_send_next_proto(SSL *s)
3671         {
3672         unsigned int len, padding_len;
3673         unsigned char *d;
3674
3675         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3676                 {
3677                 len = s->next_proto_negotiated_len;
3678                 padding_len = 32 - ((len + 2) % 32);
3679                 d = (unsigned char *)s->init_buf->data;
3680                 d[4] = len;
3681                 memcpy(d + 5, s->next_proto_negotiated, len);
3682                 d[5 + len] = padding_len;
3683                 memset(d + 6 + len, 0, padding_len);
3684                 *(d++)=SSL3_MT_NEXT_PROTO;
3685                 l2n3(2 + len + padding_len, d);
3686                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3687                 s->init_num = 4 + 2 + len + padding_len;
3688                 s->init_off = 0;
3689                 }
3690
3691         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3692 }
3693 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3694
3695 /* Check to see if handshake is full or resumed. Usually this is just a
3696  * case of checking to see if a cache hit has occurred. In the case of
3697  * session tickets we have to check the next message to be sure.
3698  */
3699
3700 #ifndef OPENSSL_NO_TLSEXT
3701 int ssl3_check_finished(SSL *s)
3702         {
3703         int ok;
3704         long n;
3705
3706         /* If we have no ticket it cannot be a resumed session. */
3707         if (!s->session->tlsext_tick)
3708                 return 1;
3709         /* this function is called when we really expect a Certificate
3710          * message, so permit appropriate message length */
3711         n=s->method->ssl_get_message(s,
3712                 SSL3_ST_CR_CERT_A,
3713                 SSL3_ST_CR_CERT_B,
3714                 -1,
3715                 s->max_cert_list,
3716                 &ok);
3717         if (!ok) return((int)n);
3718         s->s3->tmp.reuse_message = 1;
3719
3720         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3721                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3722                 return 2;
3723
3724         return 1;
3725         }
3726 #endif
3727
3728 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3729         {
3730         int i = 0;
3731 #ifndef OPENSSL_NO_ENGINE
3732         if (s->ctx->client_cert_engine)
3733                 {
3734                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3735                                                 SSL_get_client_CA_list(s),
3736                                                 px509, ppkey, NULL, NULL, NULL);
3737                 if (i != 0)
3738                         return i;
3739                 }
3740 #endif
3741         if (s->ctx->client_cert_cb)
3742                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3743         return i;
3744         }
3745