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 <openssl/crypto.h>
 153 #include "ssl_locl.h"
 154 #include "kssl_lcl.h"
 155 #include <openssl/buffer.h>
 156 #include <openssl/rand.h>
 157 #include <openssl/objects.h>
 158 #include <openssl/evp.h>
 159 #include <openssl/md5.h>
 160 #ifdef OPENSSL_FIPS
 161 #include <openssl/fips.h>
 162 #endif
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_ENGINE
 168 #include <openssl/engine.h>
 169 #endif
 170
 171 static const SSL_METHOD *ssl3_get_client_method(int ver);
 172 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 173
 174 static const SSL_METHOD *ssl3_get_client_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_client_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 183                         ssl_undefined_function,
 184                         ssl3_connect,
 185                         ssl3_get_client_method)
 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         for (;;)
 208                 {
 209                 state=s->state;
 210
 211                 switch(s->state)
 212                         {
 213                 case SSL_ST_RENEGOTIATE:
 214                         s->renegotiate=1;
 215                         s->state=SSL_ST_CONNECT;
 216                         s->ctx->stats.sess_connect_renegotiate++;
 217                         /* break */
 218                 case SSL_ST_BEFORE:
 219                 case SSL_ST_CONNECT:
 220                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 221                 case SSL_ST_OK|SSL_ST_CONNECT:
 222
 223                         s->server=0;
 224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 225
 226                         if ((s->version & 0xff00 ) != 0x0300)
 227                                 {
 228                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 229                                 ret = -1;
 230                                 goto end;
 231                                 }
 232
 233                         /* s->version=SSL3_VERSION; */
 234                         s->type=SSL_ST_CONNECT;
 235
 236                         if (s->init_buf == NULL)
 237                                 {
 238                                 if ((buf=BUF_MEM_new()) == NULL)
 239                                         {
 240                                         ret= -1;
 241                                         goto end;
 242                                         }
 243                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 244                                         {
 245                                         ret= -1;
 246                                         goto end;
 247                                         }
 248                                 s->init_buf=buf;
 249                                 buf=NULL;
 250                                 }
 251
 252                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 253
 254                         /* setup buffing BIO */
 255                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 256
 257                         /* don't push the buffering BIO quite yet */
 258
 259                         ssl3_init_finished_mac(s);
 260
 261                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 262                         s->ctx->stats.sess_connect++;
 263                         s->init_num=0;
 264                         break;
 265
 266                 case SSL3_ST_CW_CLNT_HELLO_A:
 267                 case SSL3_ST_CW_CLNT_HELLO_B:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 273                         s->init_num=0;
 274
 275                         /* turn on buffering for the next lot of output */
 276                         if (s->bbio != s->wbio)
 277                                 s->wbio=BIO_push(s->bbio,s->wbio);
 278
 279                         break;
 280
 281                 case SSL3_ST_CR_SRVR_HELLO_A:
 282                 case SSL3_ST_CR_SRVR_HELLO_B:
 283                         ret=ssl3_get_server_hello(s);
 284 #ifndef OPENSSL_NO_SRP
 285                         if ((ret == 0) && (s->s3->warn_alert == SSL_AD_MISSING_SRP_USERNAME))
 286                                 {
 287                                 if (!SRP_have_to_put_srp_username(s))
 288                                         {
 289                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_MISSING_SRP_USERNAME);
 290                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_USER_CANCELLED);
 291                                         goto end;
 292                                         }
 293                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 294                                 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 295                                 break;
 296                                 }
 297 #endif
 298                         if (ret <= 0) goto end;
 299
 300                         if (s->hit)
 301                                 {
 302                                 s->state=SSL3_ST_CR_FINISHED_A;
 303 #ifndef OPENSSL_NO_TLSEXT
 304                                 if (s->tlsext_ticket_expected)
 305                                         {
 306                                         /* receive renewed session ticket */
 307                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 308                                         }
 309 #endif
 310                                 }
 311                         else
 312                                 s->state=SSL3_ST_CR_CERT_A;
 313                         s->init_num=0;
 314                         break;
 315
 316                 case SSL3_ST_CR_CERT_A:
 317                 case SSL3_ST_CR_CERT_B:
 318 #ifndef OPENSSL_NO_TLSEXT
 319                         ret=ssl3_check_finished(s);
 320                         if (ret <= 0) goto end;
 321                         if (ret == 2)
 322                                 {
 323                                 s->hit = 1;
 324                                 if (s->tlsext_ticket_expected)
 325                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 326                                 else
 327                                         s->state=SSL3_ST_CR_FINISHED_A;
 328                                 s->init_num=0;
 329                                 break;
 330                                 }
 331 #endif
 332                         /* Check if it is anon DH/ECDH */
 333                         /* or PSK */
 334                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 335                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 336                                 {
 337                                 ret=ssl3_get_server_certificate(s);
 338                                 if (ret <= 0) goto end;
 339 #ifndef OPENSSL_NO_TLSEXT
 340                                 if (s->tlsext_status_expected)
 341                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 342                                 else
 343                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 344                                 }
 345                         else
 346                                 {
 347                                 skip = 1;
 348                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 349                                 }
 350 #else
 351                                 }
 352                         else
 353                                 skip=1;
 354
 355                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 356 #endif
 357                         s->init_num=0;
 358                         break;
 359
 360                 case SSL3_ST_CR_KEY_EXCH_A:
 361                 case SSL3_ST_CR_KEY_EXCH_B:
 362                         ret=ssl3_get_key_exchange(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CR_CERT_REQ_A;
 365                         s->init_num=0;
 366
 367                         /* at this point we check that we have the
 368                          * required stuff from the server */
 369                         if (!ssl3_check_cert_and_algorithm(s))
 370                                 {
 371                                 ret= -1;
 372                                 goto end;
 373                                 }
 374                         break;
 375
 376                 case SSL3_ST_CR_CERT_REQ_A:
 377                 case SSL3_ST_CR_CERT_REQ_B:
 378                         ret=ssl3_get_certificate_request(s);
 379                         if (ret <= 0) goto end;
 380                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 381                         s->init_num=0;
 382                         break;
 383
 384                 case SSL3_ST_CR_SRVR_DONE_A:
 385                 case SSL3_ST_CR_SRVR_DONE_B:
 386                         ret=ssl3_get_server_done(s);
 387                         if (ret <= 0) goto end;
 388 #ifndef OPENSSL_NO_SRP
 389                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 390                                 {
 391                                 if ((ret = SRP_Calc_A_param(s))<=0)
 392                                         {
 393                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 394                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 395                                         goto end;
 396                                         }
 397                                 }
 398 #endif
 399                         if (s->s3->tmp.cert_req)
 400                                 s->state=SSL3_ST_CW_CERT_A;
 401                         else
 402                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 403                         s->init_num=0;
 404
 405                         break;
 406
 407                 case SSL3_ST_CW_CERT_A:
 408                 case SSL3_ST_CW_CERT_B:
 409                 case SSL3_ST_CW_CERT_C:
 410                 case SSL3_ST_CW_CERT_D:
 411                         ret=ssl3_send_client_certificate(s);
 412                         if (ret <= 0) goto end;
 413                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 414                         s->init_num=0;
 415                         break;
 416
 417                 case SSL3_ST_CW_KEY_EXCH_A:
 418                 case SSL3_ST_CW_KEY_EXCH_B:
 419                         ret=ssl3_send_client_key_exchange(s);
 420                         if (ret <= 0) goto end;
 421                         /* EAY EAY EAY need to check for DH fix cert
 422                          * sent back */
 423                         /* For TLS, cert_req is set to 2, so a cert chain
 424                          * of nothing is sent, but no verify packet is sent */
 425                         /* XXX: For now, we do not support client
 426                          * authentication in ECDH cipher suites with
 427                          * ECDH (rather than ECDSA) certificates.
 428                          * We need to skip the certificate verify
 429                          * message when client's ECDH public key is sent
 430                          * inside the client certificate.
 431                          */
 432                         if (s->s3->tmp.cert_req == 1)
 433                                 {
 434                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 435                                 }
 436                         else
 437                                 {
 438                                 s->state=SSL3_ST_CW_CHANGE_A;
 439                                 s->s3->change_cipher_spec=0;
 440                                 }
 441                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 442                                 {
 443                                 s->state=SSL3_ST_CW_CHANGE_A;
 444                                 s->s3->change_cipher_spec=0;
 445                                 }
 446
 447                         s->init_num=0;
 448                         break;
 449
 450                 case SSL3_ST_CW_CERT_VRFY_A:
 451                 case SSL3_ST_CW_CERT_VRFY_B:
 452                         ret=ssl3_send_client_verify(s);
 453                         if (ret <= 0) goto end;
 454                         s->state=SSL3_ST_CW_CHANGE_A;
 455                         s->init_num=0;
 456                         s->s3->change_cipher_spec=0;
 457                         break;
 458
 459                 case SSL3_ST_CW_CHANGE_A:
 460                 case SSL3_ST_CW_CHANGE_B:
 461                         ret=ssl3_send_change_cipher_spec(s,
 462                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 463                         if (ret <= 0) goto end;
 464
 465 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 466                         s->state=SSL3_ST_CW_FINISHED_A;
 467 #else
 468                         if (s->next_proto_negotiated)
 469                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 470                         else
 471                                 s->state=SSL3_ST_CW_FINISHED_A;
 472 #endif
 473                         s->init_num=0;
 474
 475                         s->session->cipher=s->s3->tmp.new_cipher;
 476 #ifdef OPENSSL_NO_COMP
 477                         s->session->compress_meth=0;
 478 #else
 479                         if (s->s3->tmp.new_compression == NULL)
 480                                 s->session->compress_meth=0;
 481                         else
 482                                 s->session->compress_meth=
 483                                         s->s3->tmp.new_compression->id;
 484 #endif
 485                         if (!s->method->ssl3_enc->setup_key_block(s))
 486                                 {
 487                                 ret= -1;
 488                                 goto end;
 489                                 }
 490
 491                         if (!s->method->ssl3_enc->change_cipher_state(s,
 492                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 493                                 {
 494                                 ret= -1;
 495                                 goto end;
 496                                 }
 497
 498                         break;
 499
 500 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 501                 case SSL3_ST_CW_NEXT_PROTO_A:
 502                 case SSL3_ST_CW_NEXT_PROTO_B:
 503                         ret=ssl3_send_next_proto(s);
 504                         if (ret <= 0) goto end;
 505                         s->state=SSL3_ST_CW_FINISHED_A;
 506                         break;
 507 #endif
 508
 509                 case SSL3_ST_CW_FINISHED_A:
 510                 case SSL3_ST_CW_FINISHED_B:
 511                         ret=ssl3_send_finished(s,
 512                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 513                                 s->method->ssl3_enc->client_finished_label,
 514                                 s->method->ssl3_enc->client_finished_label_len);
 515                         if (ret <= 0) goto end;
 516                         s->state=SSL3_ST_CW_FLUSH;
 517
 518                         /* clear flags */
 519                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 520                         if (s->hit)
 521                                 {
 522                                 s->s3->tmp.next_state=SSL_ST_OK;
 523                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 524                                         {
 525                                         s->state=SSL_ST_OK;
 526                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 527                                         s->s3->delay_buf_pop_ret=0;
 528                                         }
 529                                 }
 530                         else
 531                                 {
 532 #ifndef OPENSSL_NO_TLSEXT
 533                                 /* Allow NewSessionTicket if ticket expected */
 534                                 if (s->tlsext_ticket_expected)
 535                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 536                                 else
 537 #endif
 538
 539                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 540                                 }
 541                         s->init_num=0;
 542                         break;
 543
 544 #ifndef OPENSSL_NO_TLSEXT
 545                 case SSL3_ST_CR_SESSION_TICKET_A:
 546                 case SSL3_ST_CR_SESSION_TICKET_B:
 547                         ret=ssl3_get_new_session_ticket(s);
 548                         if (ret <= 0) goto end;
 549                         s->state=SSL3_ST_CR_FINISHED_A;
 550                         s->init_num=0;
 551                 break;
 552
 553                 case SSL3_ST_CR_CERT_STATUS_A:
 554                 case SSL3_ST_CR_CERT_STATUS_B:
 555                         ret=ssl3_get_cert_status(s);
 556                         if (ret <= 0) goto end;
 557                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 558                         s->init_num=0;
 559                 break;
 560 #endif
 561
 562                 case SSL3_ST_CR_FINISHED_A:
 563                 case SSL3_ST_CR_FINISHED_B:
 564
 565                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 566                                 SSL3_ST_CR_FINISHED_B);
 567                         if (ret <= 0) goto end;
 568
 569                         if (s->hit)
 570                                 s->state=SSL3_ST_CW_CHANGE_A;
 571                         else
 572                                 s->state=SSL_ST_OK;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_CW_FLUSH:
 577                         s->rwstate=SSL_WRITING;
 578                         if (BIO_flush(s->wbio) <= 0)
 579                                 {
 580                                 ret= -1;
 581                                 goto end;
 582                                 }
 583                         s->rwstate=SSL_NOTHING;
 584                         s->state=s->s3->tmp.next_state;
 585                         break;
 586
 587                 case SSL_ST_OK:
 588                         /* clean a few things up */
 589                         ssl3_cleanup_key_block(s);
 590
 591                         if (s->init_buf != NULL)
 592                                 {
 593                                 BUF_MEM_free(s->init_buf);
 594                                 s->init_buf=NULL;
 595                                 }
 596
 597                         /* If we are not 'joining' the last two packets,
 598                          * remove the buffering now */
 599                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 600                                 ssl_free_wbio_buffer(s);
 601                         /* else do it later in ssl3_write */
 602
 603                         s->init_num=0;
 604                         s->renegotiate=0;
 605                         s->new_session=0;
 606
 607                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 608                         if (s->hit) s->ctx->stats.sess_hit++;
 609
 610                         ret=1;
 611                         /* s->server=0; */
 612                         s->handshake_func=ssl3_connect;
 613                         s->ctx->stats.sess_connect_good++;
 614
 615                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 616
 617                         goto end;
 618                         /* break; */
 619
 620                 default:
 621                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 622                         ret= -1;
 623                         goto end;
 624                         /* break; */
 625                         }
 626
 627                 /* did we do anything */
 628                 if (!s->s3->tmp.reuse_message && !skip)
 629                         {
 630                         if (s->debug)
 631                                 {
 632                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 633                                         goto end;
 634                                 }
 635
 636                         if ((cb != NULL) && (s->state != state))
 637                                 {
 638                                 new_state=s->state;
 639                                 s->state=state;
 640                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 641                                 s->state=new_state;
 642                                 }
 643                         }
 644                 skip=0;
 645                 }
 646 end:
 647         s->in_handshake--;
 648         if (buf != NULL)
 649                 BUF_MEM_free(buf);
 650         if (cb != NULL)
 651                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 652         return(ret);
 653         }
 654
 655
 656 int ssl3_client_hello(SSL *s)
 657         {
 658         unsigned char *buf;
 659         unsigned char *p,*d;
 660         int i;
 661         unsigned long Time,l;
 662 #ifndef OPENSSL_NO_COMP
 663         int j;
 664         SSL_COMP *comp;
 665 #endif
 666
 667         buf=(unsigned char *)s->init_buf->data;
 668         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 669                 {
 670                 SSL_SESSION *sess = s->session;
 671                 if ((sess == NULL) ||
 672                         (sess->ssl_version != s->version) ||
 673 #ifdef OPENSSL_NO_TLSEXT
 674                         !sess->session_id_length ||
 675 #else
 676                         (!sess->session_id_length && !sess->tlsext_tick) ||
 677 #endif
 678                         (sess->not_resumable))
 679                         {
 680                         if (!ssl_get_new_session(s,0))
 681                                 goto err;
 682                         }
 683                 /* else use the pre-loaded session */
 684
 685                 p=s->s3->client_random;
 686                 Time=(unsigned long)time(NULL);                 /* Time */
 687                 l2n(Time,p);
 688                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 689                         goto err;
 690
 691                 /* Do the message type and length last */
 692                 d=p= &(buf[4]);
 693
 694                 *(p++)=s->version>>8;
 695                 *(p++)=s->version&0xff;
 696                 s->client_version=s->version;
 697
 698                 /* Random stuff */
 699                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 700                 p+=SSL3_RANDOM_SIZE;
 701
 702                 /* Session ID */
 703                 if (s->new_session)
 704                         i=0;
 705                 else
 706                         i=s->session->session_id_length;
 707                 *(p++)=i;
 708                 if (i != 0)
 709                         {
 710                         if (i > (int)sizeof(s->session->session_id))
 711                                 {
 712                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 713                                 goto err;
 714                                 }
 715                         memcpy(p,s->session->session_id,i);
 716                         p+=i;
 717                         }
 718
 719                 /* Ciphers supported */
 720                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 721                 if (i == 0)
 722                         {
 723                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 724                         goto err;
 725                         }
 726                 s2n(i,p);
 727                 p+=i;
 728
 729                 /* COMPRESSION */
 730 #ifdef OPENSSL_NO_COMP
 731                 *(p++)=1;
 732 #else
 733
 734                 if ((s->options & SSL_OP_NO_COMPRESSION)
 735                                         || !s->ctx->comp_methods)
 736                         j=0;
 737                 else
 738                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 739                 *(p++)=1+j;
 740                 for (i=0; i<j; i++)
 741                         {
 742                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 743                         *(p++)=comp->id;
 744                         }
 745 #endif
 746                 *(p++)=0; /* Add the NULL method */
 747
 748 #ifndef OPENSSL_NO_TLSEXT
 749                 /* TLS extensions*/
 750                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 751                         {
 752                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 753                         goto err;
 754                         }
 755                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 756                         {
 757                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 758                         goto err;
 759                         }
 760 #endif
 761
 762                 l=(p-d);
 763                 d=buf;
 764                 *(d++)=SSL3_MT_CLIENT_HELLO;
 765                 l2n3(l,d);
 766
 767                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 768                 /* number of bytes to write */
 769                 s->init_num=p-buf;
 770                 s->init_off=0;
 771                 }
 772
 773         /* SSL3_ST_CW_CLNT_HELLO_B */
 774         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 775 err:
 776         return(-1);
 777         }
 778
 779 int ssl3_get_server_hello(SSL *s)
 780         {
 781         STACK_OF(SSL_CIPHER) *sk;
 782         const SSL_CIPHER *c;
 783         unsigned char *p,*d;
 784         int i,al,ok;
 785         unsigned int j;
 786         long n;
 787 #ifndef OPENSSL_NO_COMP
 788         SSL_COMP *comp;
 789 #endif
 790
 791         n=s->method->ssl_get_message(s,
 792                 SSL3_ST_CR_SRVR_HELLO_A,
 793                 SSL3_ST_CR_SRVR_HELLO_B,
 794                 -1,
 795                 20000, /* ?? */
 796                 &ok);
 797
 798         if (!ok) return((int)n);
 799
 800         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 801                 {
 802                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 803                         {
 804                         if ( s->d1->send_cookie == 0)
 805                                 {
 806                                 s->s3->tmp.reuse_message = 1;
 807                                 return 1;
 808                                 }
 809                         else /* already sent a cookie */
 810                                 {
 811                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 812                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 813                                 goto f_err;
 814                                 }
 815                         }
 816                 }
 817
 818         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 819                 {
 820                 al=SSL_AD_UNEXPECTED_MESSAGE;
 821                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 822                 goto f_err;
 823                 }
 824
 825         d=p=(unsigned char *)s->init_msg;
 826
 827         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 828                 {
 829                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 830                 s->version=(s->version&0xff00)|p[1];
 831                 al=SSL_AD_PROTOCOL_VERSION;
 832                 goto f_err;
 833                 }
 834         p+=2;
 835
 836         /* load the server hello data */
 837         /* load the server random */
 838         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 839         p+=SSL3_RANDOM_SIZE;
 840
 841         /* get the session-id */
 842         j= *(p++);
 843
 844         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 845                 {
 846                 al=SSL_AD_ILLEGAL_PARAMETER;
 847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 848                 goto f_err;
 849                 }
 850
 851 #ifndef OPENSSL_NO_TLSEXT
 852         /* check if we want to resume the session based on external pre-shared secret */
 853         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 854                 {
 855                 SSL_CIPHER *pref_cipher=NULL;
 856                 s->session->master_key_length=sizeof(s->session->master_key);
 857                 if (s->tls_session_secret_cb(s, s->session->master_key,
 858                                              &s->session->master_key_length,
 859                                              NULL, &pref_cipher,
 860                                              s->tls_session_secret_cb_arg))
 861                         {
 862                         s->session->cipher = pref_cipher ?
 863                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 864                         }
 865                 }
 866 #endif /* OPENSSL_NO_TLSEXT */
 867
 868         if (j != 0 && j == s->session->session_id_length
 869             && memcmp(p,s->session->session_id,j) == 0)
 870             {
 871             if(s->sid_ctx_length != s->session->sid_ctx_length
 872                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 873                 {
 874                 /* actually a client application bug */
 875                 al=SSL_AD_ILLEGAL_PARAMETER;
 876                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 877                 goto f_err;
 878                 }
 879             s->hit=1;
 880             }
 881         else    /* a miss or crap from the other end */
 882                 {
 883                 /* If we were trying for session-id reuse, make a new
 884                  * SSL_SESSION so we don't stuff up other people */
 885                 s->hit=0;
 886                 if (s->session->session_id_length > 0)
 887                         {
 888                         if (!ssl_get_new_session(s,0))
 889                                 {
 890                                 al=SSL_AD_INTERNAL_ERROR;
 891                                 goto f_err;
 892                                 }
 893                         }
 894                 s->session->session_id_length=j;
 895                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 896                 }
 897         p+=j;
 898         c=ssl_get_cipher_by_char(s,p);
 899         if (c == NULL)
 900                 {
 901                 /* unknown cipher */
 902                 al=SSL_AD_ILLEGAL_PARAMETER;
 903                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 904                 goto f_err;
 905                 }
 906         /* TLS v1.2 only ciphersuites require v1.2 or later */
 907         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 908                 (TLS1_get_version(s) < TLS1_2_VERSION))
 909                 {
 910                 al=SSL_AD_ILLEGAL_PARAMETER;
 911                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 912                 goto f_err;
 913                 }
 914         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 915
 916         sk=ssl_get_ciphers_by_id(s);
 917         i=sk_SSL_CIPHER_find(sk,c);
 918         if (i < 0)
 919                 {
 920                 /* we did not say we would use this cipher */
 921                 al=SSL_AD_ILLEGAL_PARAMETER;
 922                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 923                 goto f_err;
 924                 }
 925
 926         /* Depending on the session caching (internal/external), the cipher
 927            and/or cipher_id values may not be set. Make sure that
 928            cipher_id is set and use it for comparison. */
 929         if (s->session->cipher)
 930                 s->session->cipher_id = s->session->cipher->id;
 931         if (s->hit && (s->session->cipher_id != c->id))
 932                 {
 933 /* Workaround is now obsolete */
 934 #if 0
 935                 if (!(s->options &
 936                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 937 #endif
 938                         {
 939                         al=SSL_AD_ILLEGAL_PARAMETER;
 940                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 941                         goto f_err;
 942                         }
 943                 }
 944         s->s3->tmp.new_cipher=c;
 945         /* Don't digest cached records if TLS v1.2: we may need them for
 946          * client authentication.
 947          */
 948         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 949                 goto f_err;
 950         /* lets get the compression algorithm */
 951         /* COMPRESSION */
 952 #ifdef OPENSSL_NO_COMP
 953         if (*(p++) != 0)
 954                 {
 955                 al=SSL_AD_ILLEGAL_PARAMETER;
 956                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 957                 goto f_err;
 958                 }
 959         /* If compression is disabled we'd better not try to resume a session
 960          * using compression.
 961          */
 962         if (s->session->compress_meth != 0)
 963                 {
 964                 al=SSL_AD_INTERNAL_ERROR;
 965                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 966                 goto f_err;
 967                 }
 968 #else
 969         j= *(p++);
 970         if (s->hit && j != s->session->compress_meth)
 971                 {
 972                 al=SSL_AD_ILLEGAL_PARAMETER;
 973                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 974                 goto f_err;
 975                 }
 976         if (j == 0)
 977                 comp=NULL;
 978         else if (s->options & SSL_OP_NO_COMPRESSION)
 979                 {
 980                 al=SSL_AD_ILLEGAL_PARAMETER;
 981                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 982                 goto f_err;
 983                 }
 984         else
 985                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 986
 987         if ((j != 0) && (comp == NULL))
 988                 {
 989                 al=SSL_AD_ILLEGAL_PARAMETER;
 990                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 991                 goto f_err;
 992                 }
 993         else
 994                 {
 995                 s->s3->tmp.new_compression=comp;
 996                 }
 997 #endif
 998
 999 #ifndef OPENSSL_NO_TLSEXT
1000         /* TLS extensions*/
1001         if (s->version >= SSL3_VERSION)
1002                 {
1003                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1004                         {
1005                         /* 'al' set by ssl_parse_serverhello_tlsext */
1006                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1007                         goto f_err;
1008                         }
1009                 if (ssl_check_serverhello_tlsext(s) <= 0)
1010                         {
1011                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1012                                 goto err;
1013                         }
1014                 }
1015 #endif
1016
1017         if (p != (d+n))
1018                 {
1019                 /* wrong packet length */
1020                 al=SSL_AD_DECODE_ERROR;
1021                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1022                 goto err;
1023                 }
1024
1025         return(1);
1026 f_err:
1027         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1028 err:
1029         return(-1);
1030         }
1031
1032 int ssl3_get_server_certificate(SSL *s)
1033         {
1034         int al,i,ok,ret= -1;
1035         unsigned long n,nc,llen,l;
1036         X509 *x=NULL;
1037         const unsigned char *q,*p;
1038         unsigned char *d;
1039         STACK_OF(X509) *sk=NULL;
1040         SESS_CERT *sc;
1041         EVP_PKEY *pkey=NULL;
1042         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1043
1044         n=s->method->ssl_get_message(s,
1045                 SSL3_ST_CR_CERT_A,
1046                 SSL3_ST_CR_CERT_B,
1047                 -1,
1048                 s->max_cert_list,
1049                 &ok);
1050
1051         if (!ok) return((int)n);
1052
1053         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1054                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1055                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1056                 {
1057                 s->s3->tmp.reuse_message=1;
1058                 return(1);
1059                 }
1060
1061         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1062                 {
1063                 al=SSL_AD_UNEXPECTED_MESSAGE;
1064                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1065                 goto f_err;
1066                 }
1067         p=d=(unsigned char *)s->init_msg;
1068
1069         if ((sk=sk_X509_new_null()) == NULL)
1070                 {
1071                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1072                 goto err;
1073                 }
1074
1075         n2l3(p,llen);
1076         if (llen+3 != n)
1077                 {
1078                 al=SSL_AD_DECODE_ERROR;
1079                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1080                 goto f_err;
1081                 }
1082         for (nc=0; nc<llen; )
1083                 {
1084                 n2l3(p,l);
1085                 if ((l+nc+3) > llen)
1086                         {
1087                         al=SSL_AD_DECODE_ERROR;
1088                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1089                         goto f_err;
1090                         }
1091
1092                 q=p;
1093                 x=d2i_X509(NULL,&q,l);
1094                 if (x == NULL)
1095                         {
1096                         al=SSL_AD_BAD_CERTIFICATE;
1097                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1098                         goto f_err;
1099                         }
1100                 if (q != (p+l))
1101                         {
1102                         al=SSL_AD_DECODE_ERROR;
1103                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1104                         goto f_err;
1105                         }
1106                 if (!sk_X509_push(sk,x))
1107                         {
1108                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1109                         goto err;
1110                         }
1111                 x=NULL;
1112                 nc+=l+3;
1113                 p=q;
1114                 }
1115
1116         i=ssl_verify_cert_chain(s,sk);
1117         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1118 #ifndef OPENSSL_NO_KRB5
1119             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1120                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1121 #endif /* OPENSSL_NO_KRB5 */
1122                 )
1123                 {
1124                 al=ssl_verify_alarm_type(s->verify_result);
1125                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1126                 goto f_err;
1127                 }
1128         ERR_clear_error(); /* but we keep s->verify_result */
1129
1130         sc=ssl_sess_cert_new();
1131         if (sc == NULL) goto err;
1132
1133         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1134         s->session->sess_cert=sc;
1135
1136         sc->cert_chain=sk;
1137         /* Inconsistency alert: cert_chain does include the peer's
1138          * certificate, which we don't include in s3_srvr.c */
1139         x=sk_X509_value(sk,0);
1140         sk=NULL;
1141         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1142
1143         pkey=X509_get_pubkey(x);
1144
1145         /* VRS: allow null cert if auth == KRB5 */
1146         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1147                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1148                     ? 0 : 1;
1149
1150 #ifdef KSSL_DEBUG
1151         printf("pkey,x = %p, %p\n", pkey,x);
1152         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1153         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1154                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1155 #endif    /* KSSL_DEBUG */
1156
1157         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1158                 {
1159                 x=NULL;
1160                 al=SSL3_AL_FATAL;
1161                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1162                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1163                 goto f_err;
1164                 }
1165
1166         i=ssl_cert_type(x,pkey);
1167         if (need_cert && i < 0)
1168                 {
1169                 x=NULL;
1170                 al=SSL3_AL_FATAL;
1171                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1172                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1173                 goto f_err;
1174                 }
1175
1176         if (need_cert)
1177                 {
1178                 sc->peer_cert_type=i;
1179                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1180                 /* Why would the following ever happen?
1181                  * We just created sc a couple of lines ago. */
1182                 if (sc->peer_pkeys[i].x509 != NULL)
1183                         X509_free(sc->peer_pkeys[i].x509);
1184                 sc->peer_pkeys[i].x509=x;
1185                 sc->peer_key= &(sc->peer_pkeys[i]);
1186
1187                 if (s->session->peer != NULL)
1188                         X509_free(s->session->peer);
1189                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1190                 s->session->peer=x;
1191                 }
1192         else
1193                 {
1194                 sc->peer_cert_type=i;
1195                 sc->peer_key= NULL;
1196
1197                 if (s->session->peer != NULL)
1198                         X509_free(s->session->peer);
1199                 s->session->peer=NULL;
1200                 }
1201         s->session->verify_result = s->verify_result;
1202
1203         x=NULL;
1204         ret=1;
1205
1206         if (0)
1207                 {
1208 f_err:
1209                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1210                 }
1211 err:
1212         EVP_PKEY_free(pkey);
1213         X509_free(x);
1214         sk_X509_pop_free(sk,X509_free);
1215         return(ret);
1216         }
1217
1218 int ssl3_get_key_exchange(SSL *s)
1219         {
1220 #ifndef OPENSSL_NO_RSA
1221         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1222 #endif
1223         EVP_MD_CTX md_ctx;
1224         unsigned char *param,*p;
1225         int al,i,j,param_len,ok;
1226         long n,alg_k,alg_a;
1227         EVP_PKEY *pkey=NULL;
1228         const EVP_MD *md = NULL;
1229 #ifndef OPENSSL_NO_RSA
1230         RSA *rsa=NULL;
1231 #endif
1232 #ifndef OPENSSL_NO_DH
1233         DH *dh=NULL;
1234 #endif
1235 #ifndef OPENSSL_NO_ECDH
1236         EC_KEY *ecdh = NULL;
1237         BN_CTX *bn_ctx = NULL;
1238         EC_POINT *srvr_ecpoint = NULL;
1239         int curve_nid = 0;
1240         int encoded_pt_len = 0;
1241 #endif
1242
1243         /* use same message size as in ssl3_get_certificate_request()
1244          * as ServerKeyExchange message may be skipped */
1245         n=s->method->ssl_get_message(s,
1246                 SSL3_ST_CR_KEY_EXCH_A,
1247                 SSL3_ST_CR_KEY_EXCH_B,
1248                 -1,
1249                 s->max_cert_list,
1250                 &ok);
1251         if (!ok) return((int)n);
1252
1253         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1254                 {
1255 #ifndef OPENSSL_NO_PSK
1256                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1257                    omitted if no identity hint is sent. Set
1258                    session->sess_cert anyway to avoid problems
1259                    later.*/
1260                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1261                         {
1262                         s->session->sess_cert=ssl_sess_cert_new();
1263                         if (s->ctx->psk_identity_hint)
1264                                 OPENSSL_free(s->ctx->psk_identity_hint);
1265                         s->ctx->psk_identity_hint = NULL;
1266                         }
1267 #endif
1268                 s->s3->tmp.reuse_message=1;
1269                 return(1);
1270                 }
1271
1272         param=p=(unsigned char *)s->init_msg;
1273         if (s->session->sess_cert != NULL)
1274                 {
1275 #ifndef OPENSSL_NO_RSA
1276                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1277                         {
1278                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1279                         s->session->sess_cert->peer_rsa_tmp=NULL;
1280                         }
1281 #endif
1282 #ifndef OPENSSL_NO_DH
1283                 if (s->session->sess_cert->peer_dh_tmp)
1284                         {
1285                         DH_free(s->session->sess_cert->peer_dh_tmp);
1286                         s->session->sess_cert->peer_dh_tmp=NULL;
1287                         }
1288 #endif
1289 #ifndef OPENSSL_NO_ECDH
1290                 if (s->session->sess_cert->peer_ecdh_tmp)
1291                         {
1292                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1293                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1294                         }
1295 #endif
1296                 }
1297         else
1298                 {
1299                 s->session->sess_cert=ssl_sess_cert_new();
1300                 }
1301
1302         param_len=0;
1303         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1304         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1305         EVP_MD_CTX_init(&md_ctx);
1306
1307 #ifndef OPENSSL_NO_PSK
1308         if (alg_k & SSL_kPSK)
1309                 {
1310                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1311
1312                 al=SSL_AD_HANDSHAKE_FAILURE;
1313                 n2s(p,i);
1314                 param_len=i+2;
1315                 /* Store PSK identity hint for later use, hint is used
1316                  * in ssl3_send_client_key_exchange.  Assume that the
1317                  * maximum length of a PSK identity hint can be as
1318                  * long as the maximum length of a PSK identity. */
1319                 if (i > PSK_MAX_IDENTITY_LEN)
1320                         {
1321                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1322                                 SSL_R_DATA_LENGTH_TOO_LONG);
1323                         goto f_err;
1324                         }
1325                 if (param_len > n)
1326                         {
1327                         al=SSL_AD_DECODE_ERROR;
1328                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1329                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1330                         goto f_err;
1331                         }
1332                 /* If received PSK identity hint contains NULL
1333                  * characters, the hint is truncated from the first
1334                  * NULL. p may not be ending with NULL, so create a
1335                  * NULL-terminated string. */
1336                 memcpy(tmp_id_hint, p, i);
1337                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1338                 if (s->ctx->psk_identity_hint != NULL)
1339                         OPENSSL_free(s->ctx->psk_identity_hint);
1340                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1341                 if (s->ctx->psk_identity_hint == NULL)
1342                         {
1343                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1344                         goto f_err;
1345                         }
1346
1347                 p+=i;
1348                 n-=param_len;
1349                 }
1350         else
1351 #endif /* !OPENSSL_NO_PSK */
1352 #ifndef OPENSSL_NO_SRP
1353         if (alg_k & SSL_kSRP)
1354                 {
1355                 n2s(p,i);
1356                 param_len=i+2;
1357                 if (param_len > n)
1358                         {
1359                         al=SSL_AD_DECODE_ERROR;
1360                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1361                         goto f_err;
1362                         }
1363                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1364                         {
1365                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1366                         goto err;
1367                         }
1368                 p+=i;
1369
1370                 n2s(p,i);
1371                 param_len+=i+2;
1372                 if (param_len > n)
1373                         {
1374                         al=SSL_AD_DECODE_ERROR;
1375                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1376                         goto f_err;
1377                         }
1378                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1379                         {
1380                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1381                         goto err;
1382                         }
1383                 p+=i;
1384
1385                 i = (unsigned int)(p[0]);
1386                 p++;
1387                 param_len+=i+1;
1388                 if (param_len > n)
1389                         {
1390                         al=SSL_AD_DECODE_ERROR;
1391                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1392                         goto f_err;
1393                         }
1394                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1395                         {
1396                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1397                         goto err;
1398                         }
1399                 p+=i;
1400
1401                 n2s(p,i);
1402                 param_len+=i+2;
1403                 if (param_len > n)
1404                         {
1405                         al=SSL_AD_DECODE_ERROR;
1406                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1407                         goto f_err;
1408                         }
1409                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1410                         {
1411                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1412                         goto err;
1413                         }
1414                 p+=i;
1415                 n-=param_len;
1416
1417 /* We must check if there is a certificate */
1418 #ifndef OPENSSL_NO_RSA
1419                 if (alg_a & SSL_aRSA)
1420                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1421 #else
1422                 if (0)
1423                         ;
1424 #endif
1425 #ifndef OPENSSL_NO_DSA
1426                 else if (alg_a & SSL_aDSS)
1427                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1428 #endif
1429                 }
1430         else
1431 #endif /* !OPENSSL_NO_SRP */
1432 #ifndef OPENSSL_NO_RSA
1433         if (alg_k & SSL_kRSA)
1434                 {
1435                 if ((rsa=RSA_new()) == NULL)
1436                         {
1437                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1438                         goto err;
1439                         }
1440                 n2s(p,i);
1441                 param_len=i+2;
1442                 if (param_len > n)
1443                         {
1444                         al=SSL_AD_DECODE_ERROR;
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1446                         goto f_err;
1447                         }
1448                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1449                         {
1450                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1451                         goto err;
1452                         }
1453                 p+=i;
1454
1455                 n2s(p,i);
1456                 param_len+=i+2;
1457                 if (param_len > n)
1458                         {
1459                         al=SSL_AD_DECODE_ERROR;
1460                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1461                         goto f_err;
1462                         }
1463                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1464                         {
1465                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1466                         goto err;
1467                         }
1468                 p+=i;
1469                 n-=param_len;
1470
1471                 /* this should be because we are using an export cipher */
1472                 if (alg_a & SSL_aRSA)
1473                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1474                 else
1475                         {
1476                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1477                         goto err;
1478                         }
1479                 s->session->sess_cert->peer_rsa_tmp=rsa;
1480                 rsa=NULL;
1481                 }
1482 #else /* OPENSSL_NO_RSA */
1483         if (0)
1484                 ;
1485 #endif
1486 #ifndef OPENSSL_NO_DH
1487         else if (alg_k & SSL_kEDH)
1488                 {
1489                 if ((dh=DH_new()) == NULL)
1490                         {
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1492                         goto err;
1493                         }
1494                 n2s(p,i);
1495                 param_len=i+2;
1496                 if (param_len > n)
1497                         {
1498                         al=SSL_AD_DECODE_ERROR;
1499                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1500                         goto f_err;
1501                         }
1502                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1503                         {
1504                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1505                         goto err;
1506                         }
1507                 p+=i;
1508
1509                 n2s(p,i);
1510                 param_len+=i+2;
1511                 if (param_len > n)
1512                         {
1513                         al=SSL_AD_DECODE_ERROR;
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1515                         goto f_err;
1516                         }
1517                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1518                         {
1519                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1520                         goto err;
1521                         }
1522                 p+=i;
1523
1524                 n2s(p,i);
1525                 param_len+=i+2;
1526                 if (param_len > n)
1527                         {
1528                         al=SSL_AD_DECODE_ERROR;
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1530                         goto f_err;
1531                         }
1532                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1533                         {
1534                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1535                         goto err;
1536                         }
1537                 p+=i;
1538                 n-=param_len;
1539
1540 #ifndef OPENSSL_NO_RSA
1541                 if (alg_a & SSL_aRSA)
1542                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1543 #else
1544                 if (0)
1545                         ;
1546 #endif
1547 #ifndef OPENSSL_NO_DSA
1548                 else if (alg_a & SSL_aDSS)
1549                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1550 #endif
1551                 /* else anonymous DH, so no certificate or pkey. */
1552
1553                 s->session->sess_cert->peer_dh_tmp=dh;
1554                 dh=NULL;
1555                 }
1556         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1557                 {
1558                 al=SSL_AD_ILLEGAL_PARAMETER;
1559                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1560                 goto f_err;
1561                 }
1562 #endif /* !OPENSSL_NO_DH */
1563
1564 #ifndef OPENSSL_NO_ECDH
1565         else if (alg_k & SSL_kEECDH)
1566                 {
1567                 EC_GROUP *ngroup;
1568                 const EC_GROUP *group;
1569
1570                 if ((ecdh=EC_KEY_new()) == NULL)
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1573                         goto err;
1574                         }
1575
1576                 /* Extract elliptic curve parameters and the
1577                  * server's ephemeral ECDH public key.
1578                  * Keep accumulating lengths of various components in
1579                  * param_len and make sure it never exceeds n.
1580                  */
1581
1582                 /* XXX: For now we only support named (not generic) curves
1583                  * and the ECParameters in this case is just three bytes.
1584                  */
1585                 param_len=3;
1586                 if ((param_len > n) ||
1587                     (*p != NAMED_CURVE_TYPE) ||
1588                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1589                         {
1590                         al=SSL_AD_INTERNAL_ERROR;
1591                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1592                         goto f_err;
1593                         }
1594
1595                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1596                 if (ngroup == NULL)
1597                         {
1598                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1599                         goto err;
1600                         }
1601                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1602                         {
1603                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1604                         goto err;
1605                         }
1606                 EC_GROUP_free(ngroup);
1607
1608                 group = EC_KEY_get0_group(ecdh);
1609
1610                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1611                     (EC_GROUP_get_degree(group) > 163))
1612                         {
1613                         al=SSL_AD_EXPORT_RESTRICTION;
1614                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1615                         goto f_err;
1616                         }
1617
1618                 p+=3;
1619
1620                 /* Next, get the encoded ECPoint */
1621                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1622                     ((bn_ctx = BN_CTX_new()) == NULL))
1623                         {
1624                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1625                         goto err;
1626                         }
1627
1628                 encoded_pt_len = *p;  /* length of encoded point */
1629                 p+=1;
1630                 param_len += (1 + encoded_pt_len);
1631                 if ((param_len > n) ||
1632                     (EC_POINT_oct2point(group, srvr_ecpoint,
1633                         p, encoded_pt_len, bn_ctx) == 0))
1634                         {
1635                         al=SSL_AD_DECODE_ERROR;
1636                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1637                         goto f_err;
1638                         }
1639
1640                 n-=param_len;
1641                 p+=encoded_pt_len;
1642
1643                 /* The ECC/TLS specification does not mention
1644                  * the use of DSA to sign ECParameters in the server
1645                  * key exchange message. We do support RSA and ECDSA.
1646                  */
1647                 if (0) ;
1648 #ifndef OPENSSL_NO_RSA
1649                 else if (alg_a & SSL_aRSA)
1650                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1651 #endif
1652 #ifndef OPENSSL_NO_ECDSA
1653                 else if (alg_a & SSL_aECDSA)
1654                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1655 #endif
1656                 /* else anonymous ECDH, so no certificate or pkey. */
1657                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1658                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1659                 ecdh=NULL;
1660                 BN_CTX_free(bn_ctx);
1661                 bn_ctx = NULL;
1662                 EC_POINT_free(srvr_ecpoint);
1663                 srvr_ecpoint = NULL;
1664                 }
1665         else if (alg_k)
1666                 {
1667                 al=SSL_AD_UNEXPECTED_MESSAGE;
1668                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1669                 goto f_err;
1670                 }
1671 #endif /* !OPENSSL_NO_ECDH */
1672
1673
1674         /* p points to the next byte, there are 'n' bytes left */
1675
1676         /* if it was signed, check the signature */
1677         if (pkey != NULL)
1678                 {
1679                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1680                         {
1681                         int sigalg = tls12_get_sigid(pkey);
1682                         /* Should never happen */
1683                         if (sigalg == -1)
1684                                 {
1685                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1686                                 goto err;
1687                                 }
1688                         /* Check key type is consistent with signature */
1689                         if (sigalg != (int)p[1])
1690                                 {
1691                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1692                                 al=SSL_AD_DECODE_ERROR;
1693                                 goto f_err;
1694                                 }
1695                         md = tls12_get_hash(p[0]);
1696                         if (md == NULL)
1697                                 {
1698                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1699                                 al=SSL_AD_DECODE_ERROR;
1700                                 goto f_err;
1701                                 }
1702 #ifdef SSL_DEBUG
1703 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1704 #endif
1705                         p += 2;
1706                         n -= 2;
1707                         }
1708                 else
1709                         md = EVP_sha1();
1710
1711                 n2s(p,i);
1712                 n-=2;
1713                 j=EVP_PKEY_size(pkey);
1714
1715                 if ((i != n) || (n > j) || (n <= 0))
1716                         {
1717                         /* wrong packet length */
1718                         al=SSL_AD_DECODE_ERROR;
1719                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1720                         goto f_err;
1721                         }
1722
1723 #ifndef OPENSSL_NO_RSA
1724                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1725                         {
1726                         int num;
1727
1728                         j=0;
1729                         q=md_buf;
1730                         for (num=2; num > 0; num--)
1731                                 {
1732                                 EVP_MD_CTX_set_flags(&md_ctx,
1733                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1734                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1735                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1736                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1737                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1738                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1739                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1740                                 q+=i;
1741                                 j+=i;
1742                                 }
1743                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1744                                                                 pkey->pkey.rsa);
1745                         if (i < 0)
1746                                 {
1747                                 al=SSL_AD_DECRYPT_ERROR;
1748                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1749                                 goto f_err;
1750                                 }
1751                         if (i == 0)
1752                                 {
1753                                 /* bad signature */
1754                                 al=SSL_AD_DECRYPT_ERROR;
1755                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1756                                 goto f_err;
1757                                 }
1758                         }
1759                 else
1760 #endif
1761                         {
1762                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1763                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1764                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1765                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1766                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1767                                 {
1768                                 /* bad signature */
1769                                 al=SSL_AD_DECRYPT_ERROR;
1770                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1771                                 goto f_err;
1772                                 }
1773                         }
1774                 }
1775         else
1776                 {
1777                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1778                         /* aNULL or kPSK do not need public keys */
1779                         {
1780                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1781                         goto err;
1782                         }
1783                 /* still data left over */
1784                 if (n != 0)
1785                         {
1786                         al=SSL_AD_DECODE_ERROR;
1787                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1788                         goto f_err;
1789                         }
1790                 }
1791         EVP_PKEY_free(pkey);
1792         EVP_MD_CTX_cleanup(&md_ctx);
1793         return(1);
1794 f_err:
1795         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1796 err:
1797         EVP_PKEY_free(pkey);
1798 #ifndef OPENSSL_NO_RSA
1799         if (rsa != NULL)
1800                 RSA_free(rsa);
1801 #endif
1802 #ifndef OPENSSL_NO_DH
1803         if (dh != NULL)
1804                 DH_free(dh);
1805 #endif
1806 #ifndef OPENSSL_NO_ECDH
1807         BN_CTX_free(bn_ctx);
1808         EC_POINT_free(srvr_ecpoint);
1809         if (ecdh != NULL)
1810                 EC_KEY_free(ecdh);
1811 #endif
1812         EVP_MD_CTX_cleanup(&md_ctx);
1813         return(-1);
1814         }
1815
1816 int ssl3_get_certificate_request(SSL *s)
1817         {
1818         int ok,ret=0;
1819         unsigned long n,nc,l;
1820         unsigned int llen, ctype_num,i;
1821         X509_NAME *xn=NULL;
1822         const unsigned char *p,*q;
1823         unsigned char *d;
1824         STACK_OF(X509_NAME) *ca_sk=NULL;
1825
1826         n=s->method->ssl_get_message(s,
1827                 SSL3_ST_CR_CERT_REQ_A,
1828                 SSL3_ST_CR_CERT_REQ_B,
1829                 -1,
1830                 s->max_cert_list,
1831                 &ok);
1832
1833         if (!ok) return((int)n);
1834
1835         s->s3->tmp.cert_req=0;
1836
1837         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1838                 {
1839                 s->s3->tmp.reuse_message=1;
1840                 /* If we get here we don't need any cached handshake records
1841                  * as we wont be doing client auth.
1842                  */
1843                 if (s->s3->handshake_buffer)
1844                         {
1845                         if (!ssl3_digest_cached_records(s))
1846                                 goto err;
1847                         }
1848                 return(1);
1849                 }
1850
1851         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1852                 {
1853                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1854                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1855                 goto err;
1856                 }
1857
1858         /* TLS does not like anon-DH with client cert */
1859         if (s->version > SSL3_VERSION)
1860                 {
1861                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1862                         {
1863                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1864                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1865                         goto err;
1866                         }
1867                 }
1868
1869         p=d=(unsigned char *)s->init_msg;
1870
1871         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1872                 {
1873                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1874                 goto err;
1875                 }
1876
1877         /* get the certificate types */
1878         ctype_num= *(p++);
1879         if (ctype_num > SSL3_CT_NUMBER)
1880                 ctype_num=SSL3_CT_NUMBER;
1881         for (i=0; i<ctype_num; i++)
1882                 s->s3->tmp.ctype[i]= p[i];
1883         p+=ctype_num;
1884         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1885                 {
1886                 n2s(p, llen);
1887                 /* Check we have enough room for signature algorithms and
1888                  * following length value.
1889                  */
1890                 if ((unsigned long)(p - d + llen + 2) > n)
1891                         {
1892                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1893                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1894                         goto err;
1895                         }
1896                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1897                         {
1898                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1899                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1900                         goto err;
1901                         }
1902                 p += llen;
1903                 }
1904
1905         /* get the CA RDNs */
1906         n2s(p,llen);
1907 #if 0
1908 {
1909 FILE *out;
1910 out=fopen("/tmp/vsign.der","w");
1911 fwrite(p,1,llen,out);
1912 fclose(out);
1913 }
1914 #endif
1915
1916         if ((unsigned long)(p - d + llen) != n)
1917                 {
1918                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1919                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1920                 goto err;
1921                 }
1922
1923         for (nc=0; nc<llen; )
1924                 {
1925                 n2s(p,l);
1926                 if ((l+nc+2) > llen)
1927                         {
1928                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1929                                 goto cont; /* netscape bugs */
1930                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1931                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1932                         goto err;
1933                         }
1934
1935                 q=p;
1936
1937                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1938                         {
1939                         /* If netscape tolerance is on, ignore errors */
1940                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1941                                 goto cont;
1942                         else
1943                                 {
1944                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1945                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1946                                 goto err;
1947                                 }
1948                         }
1949
1950                 if (q != (p+l))
1951                         {
1952                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1953                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1954                         goto err;
1955                         }
1956                 if (!sk_X509_NAME_push(ca_sk,xn))
1957                         {
1958                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1959                         goto err;
1960                         }
1961
1962                 p+=l;
1963                 nc+=l+2;
1964                 }
1965
1966         if (0)
1967                 {
1968 cont:
1969                 ERR_clear_error();
1970                 }
1971
1972         /* we should setup a certificate to return.... */
1973         s->s3->tmp.cert_req=1;
1974         s->s3->tmp.ctype_num=ctype_num;
1975         if (s->s3->tmp.ca_names != NULL)
1976                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1977         s->s3->tmp.ca_names=ca_sk;
1978         ca_sk=NULL;
1979
1980         ret=1;
1981 err:
1982         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1983         return(ret);
1984         }
1985
1986 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1987         {
1988         return(X509_NAME_cmp(*a,*b));
1989         }
1990 #ifndef OPENSSL_NO_TLSEXT
1991 int ssl3_get_new_session_ticket(SSL *s)
1992         {
1993         int ok,al,ret=0, ticklen;
1994         long n;
1995         const unsigned char *p;
1996         unsigned char *d;
1997
1998         n=s->method->ssl_get_message(s,
1999                 SSL3_ST_CR_SESSION_TICKET_A,
2000                 SSL3_ST_CR_SESSION_TICKET_B,
2001                 -1,
2002                 16384,
2003                 &ok);
2004
2005         if (!ok)
2006                 return((int)n);
2007
2008         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2009                 {
2010                 s->s3->tmp.reuse_message=1;
2011                 return(1);
2012                 }
2013         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2014                 {
2015                 al=SSL_AD_UNEXPECTED_MESSAGE;
2016                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2017                 goto f_err;
2018                 }
2019         if (n < 6)
2020                 {
2021                 /* need at least ticket_lifetime_hint + ticket length */
2022                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2023                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2024                 goto f_err;
2025                 }
2026
2027         p=d=(unsigned char *)s->init_msg;
2028         n2l(p, s->session->tlsext_tick_lifetime_hint);
2029         n2s(p, ticklen);
2030         /* ticket_lifetime_hint + ticket_length + ticket */
2031         if (ticklen + 6 != n)
2032                 {
2033                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2034                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2035                 goto f_err;
2036                 }
2037         if (s->session->tlsext_tick)
2038                 {
2039                 OPENSSL_free(s->session->tlsext_tick);
2040                 s->session->tlsext_ticklen = 0;
2041                 }
2042         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2043         if (!s->session->tlsext_tick)
2044                 {
2045                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2046                 goto err;
2047                 }
2048         memcpy(s->session->tlsext_tick, p, ticklen);
2049         s->session->tlsext_ticklen = ticklen;
2050         /* There are two ways to detect a resumed ticket sesion.
2051          * One is to set an appropriate session ID and then the server
2052          * must return a match in ServerHello. This allows the normal
2053          * client session ID matching to work and we know much
2054          * earlier that the ticket has been accepted.
2055          *
2056          * The other way is to set zero length session ID when the
2057          * ticket is presented and rely on the handshake to determine
2058          * session resumption.
2059          *
2060          * We choose the former approach because this fits in with
2061          * assumptions elsewhere in OpenSSL. The session ID is set
2062          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2063          * ticket.
2064          */
2065         EVP_Digest(p, ticklen,
2066                         s->session->session_id, &s->session->session_id_length,
2067 #ifndef OPENSSL_NO_SHA256
2068                                                         EVP_sha256(), NULL);
2069 #else
2070                                                         EVP_sha1(), NULL);
2071 #endif
2072         ret=1;
2073         return(ret);
2074 f_err:
2075         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2076 err:
2077         return(-1);
2078         }
2079
2080 int ssl3_get_cert_status(SSL *s)
2081         {
2082         int ok, al;
2083         unsigned long resplen,n;
2084         const unsigned char *p;
2085
2086         n=s->method->ssl_get_message(s,
2087                 SSL3_ST_CR_CERT_STATUS_A,
2088                 SSL3_ST_CR_CERT_STATUS_B,
2089                 SSL3_MT_CERTIFICATE_STATUS,
2090                 16384,
2091                 &ok);
2092
2093         if (!ok) return((int)n);
2094         if (n < 4)
2095                 {
2096                 /* need at least status type + length */
2097                 al = SSL_AD_DECODE_ERROR;
2098                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2099                 goto f_err;
2100                 }
2101         p = (unsigned char *)s->init_msg;
2102         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2103                 {
2104                 al = SSL_AD_DECODE_ERROR;
2105                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2106                 goto f_err;
2107                 }
2108         n2l3(p, resplen);
2109         if (resplen + 4 != n)
2110                 {
2111                 al = SSL_AD_DECODE_ERROR;
2112                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2113                 goto f_err;
2114                 }
2115         if (s->tlsext_ocsp_resp)
2116                 OPENSSL_free(s->tlsext_ocsp_resp);
2117         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2118         if (!s->tlsext_ocsp_resp)
2119                 {
2120                 al = SSL_AD_INTERNAL_ERROR;
2121                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2122                 goto f_err;
2123                 }
2124         s->tlsext_ocsp_resplen = resplen;
2125         if (s->ctx->tlsext_status_cb)
2126                 {
2127                 int ret;
2128                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2129                 if (ret == 0)
2130                         {
2131                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2132                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2133                         goto f_err;
2134                         }
2135                 if (ret < 0)
2136                         {
2137                         al = SSL_AD_INTERNAL_ERROR;
2138                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2139                         goto f_err;
2140                         }
2141                 }
2142         return 1;
2143 f_err:
2144         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2145         return(-1);
2146         }
2147 #endif
2148
2149 int ssl3_get_server_done(SSL *s)
2150         {
2151         int ok,ret=0;
2152         long n;
2153
2154         n=s->method->ssl_get_message(s,
2155                 SSL3_ST_CR_SRVR_DONE_A,
2156                 SSL3_ST_CR_SRVR_DONE_B,
2157                 SSL3_MT_SERVER_DONE,
2158                 30, /* should be very small, like 0 :-) */
2159                 &ok);
2160
2161         if (!ok) return((int)n);
2162         if (n > 0)
2163                 {
2164                 /* should contain no data */
2165                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2166                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2167                 return -1;
2168                 }
2169         ret=1;
2170         return(ret);
2171         }
2172
2173
2174 int ssl3_send_client_key_exchange(SSL *s)
2175         {
2176         unsigned char *p,*d;
2177         int n;
2178         unsigned long alg_k;
2179 #ifndef OPENSSL_NO_RSA
2180         unsigned char *q;
2181         EVP_PKEY *pkey=NULL;
2182 #endif
2183 #ifndef OPENSSL_NO_KRB5
2184         KSSL_ERR kssl_err;
2185 #endif /* OPENSSL_NO_KRB5 */
2186 #ifndef OPENSSL_NO_ECDH
2187         EC_KEY *clnt_ecdh = NULL;
2188         const EC_POINT *srvr_ecpoint = NULL;
2189         EVP_PKEY *srvr_pub_pkey = NULL;
2190         unsigned char *encodedPoint = NULL;
2191         int encoded_pt_len = 0;
2192         BN_CTX * bn_ctx = NULL;
2193 #endif
2194
2195         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2196                 {
2197                 d=(unsigned char *)s->init_buf->data;
2198                 p= &(d[4]);
2199
2200                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2201
2202                 /* Fool emacs indentation */
2203                 if (0) {}
2204 #ifndef OPENSSL_NO_RSA
2205                 else if (alg_k & SSL_kRSA)
2206                         {
2207                         RSA *rsa;
2208                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2209
2210                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2211                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2212                         else
2213                                 {
2214                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2215                                 if ((pkey == NULL) ||
2216                                         (pkey->type != EVP_PKEY_RSA) ||
2217                                         (pkey->pkey.rsa == NULL))
2218                                         {
2219                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2220                                         goto err;
2221                                         }
2222                                 rsa=pkey->pkey.rsa;
2223                                 EVP_PKEY_free(pkey);
2224                                 }
2225
2226                         tmp_buf[0]=s->client_version>>8;
2227                         tmp_buf[1]=s->client_version&0xff;
2228                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2229                                         goto err;
2230
2231                         s->session->master_key_length=sizeof tmp_buf;
2232
2233                         q=p;
2234                         /* Fix buf for TLS and beyond */
2235                         if (s->version > SSL3_VERSION)
2236                                 p+=2;
2237                         n=RSA_public_encrypt(sizeof tmp_buf,
2238                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2239 #ifdef PKCS1_CHECK
2240                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2241                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2242 #endif
2243                         if (n <= 0)
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2246                                 goto err;
2247                                 }
2248
2249                         /* Fix buf for TLS and beyond */
2250                         if (s->version > SSL3_VERSION)
2251                                 {
2252                                 s2n(n,q);
2253                                 n+=2;
2254                                 }
2255
2256                         s->session->master_key_length=
2257                                 s->method->ssl3_enc->generate_master_secret(s,
2258                                         s->session->master_key,
2259                                         tmp_buf,sizeof tmp_buf);
2260                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2261                         }
2262 #endif
2263 #ifndef OPENSSL_NO_KRB5
2264                 else if (alg_k & SSL_kKRB5)
2265                         {
2266                         krb5_error_code krb5rc;
2267                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2268                         /*  krb5_data   krb5_ap_req;  */
2269                         krb5_data       *enc_ticket;
2270                         krb5_data       authenticator, *authp = NULL;
2271                         EVP_CIPHER_CTX  ciph_ctx;
2272                         const EVP_CIPHER *enc = NULL;
2273                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2274                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2275                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2276                                                 + EVP_MAX_IV_LENGTH];
2277                         int             padl, outl = sizeof(epms);
2278
2279                         EVP_CIPHER_CTX_init(&ciph_ctx);
2280
2281 #ifdef KSSL_DEBUG
2282                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2283                                 alg_k, SSL_kKRB5);
2284 #endif  /* KSSL_DEBUG */
2285
2286                         authp = NULL;
2287 #ifdef KRB5SENDAUTH
2288                         if (KRB5SENDAUTH)  authp = &authenticator;
2289 #endif  /* KRB5SENDAUTH */
2290
2291                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2292                                 &kssl_err);
2293                         enc = kssl_map_enc(kssl_ctx->enctype);
2294                         if (enc == NULL)
2295                             goto err;
2296 #ifdef KSSL_DEBUG
2297                         {
2298                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2299                         if (krb5rc && kssl_err.text)
2300                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2301                         }
2302 #endif  /* KSSL_DEBUG */
2303
2304                         if (krb5rc)
2305                                 {
2306                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2307                                                 SSL_AD_HANDSHAKE_FAILURE);
2308                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2309                                                 kssl_err.reason);
2310                                 goto err;
2311                                 }
2312
2313                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2314                         **  in place of RFC 2712 KerberosWrapper, as in:
2315                         **
2316                         **  Send ticket (copy to *p, set n = length)
2317                         **  n = krb5_ap_req.length;
2318                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2319                         **  if (krb5_ap_req.data)
2320                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2321                         **
2322                         **  Now using real RFC 2712 KerberosWrapper
2323                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2324                         **  Note: 2712 "opaque" types are here replaced
2325                         **  with a 2-byte length followed by the value.
2326                         **  Example:
2327                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2328                         **  Where "xx xx" = length bytes.  Shown here with
2329                         **  optional authenticator omitted.
2330                         */
2331
2332                         /*  KerberosWrapper.Ticket              */
2333                         s2n(enc_ticket->length,p);
2334                         memcpy(p, enc_ticket->data, enc_ticket->length);
2335                         p+= enc_ticket->length;
2336                         n = enc_ticket->length + 2;
2337
2338                         /*  KerberosWrapper.Authenticator       */
2339                         if (authp  &&  authp->length)
2340                                 {
2341                                 s2n(authp->length,p);
2342                                 memcpy(p, authp->data, authp->length);
2343                                 p+= authp->length;
2344                                 n+= authp->length + 2;
2345
2346                                 free(authp->data);
2347                                 authp->data = NULL;
2348                                 authp->length = 0;
2349                                 }
2350                         else
2351                                 {
2352                                 s2n(0,p);/*  null authenticator length  */
2353                                 n+=2;
2354                                 }
2355
2356                             tmp_buf[0]=s->client_version>>8;
2357                             tmp_buf[1]=s->client_version&0xff;
2358                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2359                                 goto err;
2360
2361                         /*  20010420 VRS.  Tried it this way; failed.
2362                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2363                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2364                         **                              kssl_ctx->length);
2365                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2366                         */
2367
2368                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2369                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2370                                 kssl_ctx->key,iv);
2371                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2372                                 sizeof tmp_buf);
2373                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2374                         outl += padl;
2375                         if (outl > (int)sizeof epms)
2376                                 {
2377                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2378                                 goto err;
2379                                 }
2380                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2381
2382                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2383                         s2n(outl,p);
2384                         memcpy(p, epms, outl);
2385                         p+=outl;
2386                         n+=outl + 2;
2387
2388                         s->session->master_key_length=
2389                                 s->method->ssl3_enc->generate_master_secret(s,
2390                                         s->session->master_key,
2391                                         tmp_buf, sizeof tmp_buf);
2392
2393                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2394                         OPENSSL_cleanse(epms, outl);
2395                         }
2396 #endif
2397 #ifndef OPENSSL_NO_DH
2398                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2399                         {
2400                         DH *dh_srvr,*dh_clnt;
2401
2402                         if (s->session->sess_cert == NULL)
2403                                 {
2404                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2405                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2406                                 goto err;
2407                                 }
2408
2409                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2410                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2411                         else
2412                                 {
2413                                 /* we get them from the cert */
2414                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2415                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2416                                 goto err;
2417                                 }
2418
2419                         /* generate a new random key */
2420                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2421                                 {
2422                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2423                                 goto err;
2424                                 }
2425                         if (!DH_generate_key(dh_clnt))
2426                                 {
2427                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2428                                 DH_free(dh_clnt);
2429                                 goto err;
2430                                 }
2431
2432                         /* use the 'p' output buffer for the DH key, but
2433                          * make sure to clear it out afterwards */
2434
2435                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2436
2437                         if (n <= 0)
2438                                 {
2439                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2440                                 DH_free(dh_clnt);
2441                                 goto err;
2442                                 }
2443
2444                         /* generate master key from the result */
2445                         s->session->master_key_length=
2446                                 s->method->ssl3_enc->generate_master_secret(s,
2447                                         s->session->master_key,p,n);
2448                         /* clean up */
2449                         memset(p,0,n);
2450
2451                         /* send off the data */
2452                         n=BN_num_bytes(dh_clnt->pub_key);
2453                         s2n(n,p);
2454                         BN_bn2bin(dh_clnt->pub_key,p);
2455                         n+=2;
2456
2457                         DH_free(dh_clnt);
2458
2459                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2460                         }
2461 #endif
2462
2463 #ifndef OPENSSL_NO_ECDH
2464                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2465                         {
2466                         const EC_GROUP *srvr_group = NULL;
2467                         EC_KEY *tkey;
2468                         int ecdh_clnt_cert = 0;
2469                         int field_size = 0;
2470
2471                         /* Did we send out the client's
2472                          * ECDH share for use in premaster
2473                          * computation as part of client certificate?
2474                          * If so, set ecdh_clnt_cert to 1.
2475                          */
2476                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2477                                 {
2478                                 /* XXX: For now, we do not support client
2479                                  * authentication using ECDH certificates.
2480                                  * To add such support, one needs to add
2481                                  * code that checks for appropriate
2482                                  * conditions and sets ecdh_clnt_cert to 1.
2483                                  * For example, the cert have an ECC
2484                                  * key on the same curve as the server's
2485                                  * and the key should be authorized for
2486                                  * key agreement.
2487                                  *
2488                                  * One also needs to add code in ssl3_connect
2489                                  * to skip sending the certificate verify
2490                                  * message.
2491                                  *
2492                                  * if ((s->cert->key->privatekey != NULL) &&
2493                                  *     (s->cert->key->privatekey->type ==
2494                                  *      EVP_PKEY_EC) && ...)
2495                                  * ecdh_clnt_cert = 1;
2496                                  */
2497                                 }
2498
2499                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2500                                 {
2501                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2502                                 }
2503                         else
2504                                 {
2505                                 /* Get the Server Public Key from Cert */
2506                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2507                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2508                                 if ((srvr_pub_pkey == NULL) ||
2509                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2510                                     (srvr_pub_pkey->pkey.ec == NULL))
2511                                         {
2512                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2513                                             ERR_R_INTERNAL_ERROR);
2514                                         goto err;
2515                                         }
2516
2517                                 tkey = srvr_pub_pkey->pkey.ec;
2518                                 }
2519
2520                         srvr_group   = EC_KEY_get0_group(tkey);
2521                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2522
2523                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2524                                 {
2525                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2526                                     ERR_R_INTERNAL_ERROR);
2527                                 goto err;
2528                                 }
2529
2530                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2531                                 {
2532                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2533                                 goto err;
2534                                 }
2535
2536                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2537                                 {
2538                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2539                                 goto err;
2540                                 }
2541                         if (ecdh_clnt_cert)
2542                                 {
2543                                 /* Reuse key info from our certificate
2544                                  * We only need our private key to perform
2545                                  * the ECDH computation.
2546                                  */
2547                                 const BIGNUM *priv_key;
2548                                 tkey = s->cert->key->privatekey->pkey.ec;
2549                                 priv_key = EC_KEY_get0_private_key(tkey);
2550                                 if (priv_key == NULL)
2551                                         {
2552                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2553                                         goto err;
2554                                         }
2555                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2556                                         {
2557                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2558                                         goto err;
2559                                         }
2560                                 }
2561                         else
2562                                 {
2563                                 /* Generate a new ECDH key pair */
2564                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2565                                         {
2566                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2567                                         goto err;
2568                                         }
2569                                 }
2570
2571                         /* use the 'p' output buffer for the ECDH key, but
2572                          * make sure to clear it out afterwards
2573                          */
2574
2575                         field_size = EC_GROUP_get_degree(srvr_group);
2576                         if (field_size <= 0)
2577                                 {
2578                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2579                                        ERR_R_ECDH_LIB);
2580                                 goto err;
2581                                 }
2582                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2583                         if (n <= 0)
2584                                 {
2585                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2586                                        ERR_R_ECDH_LIB);
2587                                 goto err;
2588                                 }
2589
2590                         /* generate master key from the result */
2591                         s->session->master_key_length = s->method->ssl3_enc \
2592                             -> generate_master_secret(s,
2593                                 s->session->master_key,
2594                                 p, n);
2595
2596                         memset(p, 0, n); /* clean up */
2597
2598                         if (ecdh_clnt_cert)
2599                                 {
2600                                 /* Send empty client key exch message */
2601                                 n = 0;
2602                                 }
2603                         else
2604                                 {
2605                                 /* First check the size of encoding and
2606                                  * allocate memory accordingly.
2607                                  */
2608                                 encoded_pt_len =
2609                                     EC_POINT_point2oct(srvr_group,
2610                                         EC_KEY_get0_public_key(clnt_ecdh),
2611                                         POINT_CONVERSION_UNCOMPRESSED,
2612                                         NULL, 0, NULL);
2613
2614                                 encodedPoint = (unsigned char *)
2615                                     OPENSSL_malloc(encoded_pt_len *
2616                                         sizeof(unsigned char));
2617                                 bn_ctx = BN_CTX_new();
2618                                 if ((encodedPoint == NULL) ||
2619                                     (bn_ctx == NULL))
2620                                         {
2621                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2622                                         goto err;
2623                                         }
2624
2625                                 /* Encode the public key */
2626                                 n = EC_POINT_point2oct(srvr_group,
2627                                     EC_KEY_get0_public_key(clnt_ecdh),
2628                                     POINT_CONVERSION_UNCOMPRESSED,
2629                                     encodedPoint, encoded_pt_len, bn_ctx);
2630
2631                                 *p = n; /* length of encoded point */
2632                                 /* Encoded point will be copied here */
2633                                 p += 1;
2634                                 /* copy the point */
2635                                 memcpy((unsigned char *)p, encodedPoint, n);
2636                                 /* increment n to account for length field */
2637                                 n += 1;
2638                                 }
2639
2640                         /* Free allocated memory */
2641                         BN_CTX_free(bn_ctx);
2642                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2643                         if (clnt_ecdh != NULL)
2644                                  EC_KEY_free(clnt_ecdh);
2645                         EVP_PKEY_free(srvr_pub_pkey);
2646                         }
2647 #endif /* !OPENSSL_NO_ECDH */
2648                 else if (alg_k & SSL_kGOST)
2649                         {
2650                         /* GOST key exchange message creation */
2651                         EVP_PKEY_CTX *pkey_ctx;
2652                         X509 *peer_cert;
2653                         size_t msglen;
2654                         unsigned int md_len;
2655                         int keytype;
2656                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2657                         EVP_MD_CTX *ukm_hash;
2658                         EVP_PKEY *pub_key;
2659
2660                         /* Get server sertificate PKEY and create ctx from it */
2661                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2662                         if (!peer_cert)
2663                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2664                         if (!peer_cert)         {
2665                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2666                                         goto err;
2667                                 }
2668
2669                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2670                         /* If we have send a certificate, and certificate key
2671
2672                          * parameters match those of server certificate, use
2673                          * certificate key for key exchange
2674                          */
2675
2676                          /* Otherwise, generate ephemeral key pair */
2677
2678                         EVP_PKEY_encrypt_init(pkey_ctx);
2679                           /* Generate session key */
2680                     RAND_bytes(premaster_secret,32);
2681                         /* If we have client certificate, use its secret as peer key */
2682                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2683                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2684                                         /* If there was an error - just ignore it. Ephemeral key
2685                                         * would be used
2686                                         */
2687                                         ERR_clear_error();
2688                                 }
2689                         }
2690                         /* Compute shared IV and store it in algorithm-specific
2691                          * context data */
2692                         ukm_hash = EVP_MD_CTX_create();
2693                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2694                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2695                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2696                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2697                         EVP_MD_CTX_destroy(ukm_hash);
2698                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2699                                 8,shared_ukm)<0) {
2700                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2701                                                 SSL_R_LIBRARY_BUG);
2702                                         goto err;
2703                                 }
2704                         /* Make GOST keytransport blob message */
2705                         /*Encapsulate it into sequence */
2706                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2707                         msglen=255;
2708                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2709                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2710                                         SSL_R_LIBRARY_BUG);
2711                                 goto err;
2712                         }
2713                         if (msglen >= 0x80)
2714                                 {
2715                                 *(p++)=0x81;
2716                                 *(p++)= msglen & 0xff;
2717                                 n=msglen+3;
2718                                 }
2719                         else
2720                                 {
2721                                 *(p++)= msglen & 0xff;
2722                                 n=msglen+2;
2723                                 }
2724                         memcpy(p, tmp, msglen);
2725                         /* Check if pubkey from client certificate was used */
2726                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2727                                 {
2728                                 /* Set flag "skip certificate verify" */
2729                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2730                                 }
2731                         EVP_PKEY_CTX_free(pkey_ctx);
2732                         s->session->master_key_length=
2733                                 s->method->ssl3_enc->generate_master_secret(s,
2734                                         s->session->master_key,premaster_secret,32);
2735                         EVP_PKEY_free(pub_key);
2736
2737                         }
2738 #ifndef OPENSSL_NO_SRP
2739                 else if (alg_k & SSL_kSRP)
2740                         {
2741                         if (s->srp_ctx.A != NULL)
2742                                 {
2743                                 /* send off the data */
2744                                 n=BN_num_bytes(s->srp_ctx.A);
2745                                 s2n(n,p);
2746                                 BN_bn2bin(s->srp_ctx.A,p);
2747                                 n+=2;
2748                                 }
2749                         else
2750                                 {
2751                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2752                                 goto err;
2753                                 }
2754                         if (s->session->srp_username != NULL)
2755                                 OPENSSL_free(s->session->srp_username);
2756                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2757                         if (s->session->srp_username == NULL)
2758                                 {
2759                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2760                                         ERR_R_MALLOC_FAILURE);
2761                                 goto err;
2762                                 }
2763
2764                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2765                                 {
2766                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2767                                 goto err;
2768                                 }
2769                         }
2770 #endif
2771 #ifndef OPENSSL_NO_PSK
2772                 else if (alg_k & SSL_kPSK)
2773                         {
2774                         char identity[PSK_MAX_IDENTITY_LEN];
2775                         unsigned char *t = NULL;
2776                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2777                         unsigned int pre_ms_len = 0, psk_len = 0;
2778                         int psk_err = 1;
2779
2780                         n = 0;
2781                         if (s->psk_client_callback == NULL)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2784                                         SSL_R_PSK_NO_CLIENT_CB);
2785                                 goto err;
2786                                 }
2787
2788                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2789                                 identity, PSK_MAX_IDENTITY_LEN,
2790                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2791                         if (psk_len > PSK_MAX_PSK_LEN)
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2794                                         ERR_R_INTERNAL_ERROR);
2795                                 goto psk_err;
2796                                 }
2797                         else if (psk_len == 0)
2798                                 {
2799                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2800                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2801                                 goto psk_err;
2802                                 }
2803
2804                         /* create PSK pre_master_secret */
2805                         pre_ms_len = 2+psk_len+2+psk_len;
2806                         t = psk_or_pre_ms;
2807                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2808                         s2n(psk_len, t);
2809                         memset(t, 0, psk_len);
2810                         t+=psk_len;
2811                         s2n(psk_len, t);
2812
2813                         if (s->session->psk_identity_hint != NULL)
2814                                 OPENSSL_free(s->session->psk_identity_hint);
2815                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2816                         if (s->ctx->psk_identity_hint != NULL &&
2817                                 s->session->psk_identity_hint == NULL)
2818                                 {
2819                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2820                                         ERR_R_MALLOC_FAILURE);
2821                                 goto psk_err;
2822                                 }
2823
2824                         if (s->session->psk_identity != NULL)
2825                                 OPENSSL_free(s->session->psk_identity);
2826                         s->session->psk_identity = BUF_strdup(identity);
2827                         if (s->session->psk_identity == NULL)
2828                                 {
2829                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2830                                         ERR_R_MALLOC_FAILURE);
2831                                 goto psk_err;
2832                                 }
2833
2834                         s->session->master_key_length =
2835                                 s->method->ssl3_enc->generate_master_secret(s,
2836                                         s->session->master_key,
2837                                         psk_or_pre_ms, pre_ms_len);
2838                         n = strlen(identity);
2839                         s2n(n, p);
2840                         memcpy(p, identity, n);
2841                         n+=2;
2842                         psk_err = 0;
2843                 psk_err:
2844                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2845                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2846                         if (psk_err != 0)
2847                                 {
2848                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2849                                 goto err;
2850                                 }
2851                         }
2852 #endif
2853                 else
2854                         {
2855                         ssl3_send_alert(s, SSL3_AL_FATAL,
2856                             SSL_AD_HANDSHAKE_FAILURE);
2857                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2858                             ERR_R_INTERNAL_ERROR);
2859                         goto err;
2860                         }
2861
2862                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2863                 l2n3(n,d);
2864
2865                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2866                 /* number of bytes to write */
2867                 s->init_num=n+4;
2868                 s->init_off=0;
2869                 }
2870
2871         /* SSL3_ST_CW_KEY_EXCH_B */
2872         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2873 err:
2874 #ifndef OPENSSL_NO_ECDH
2875         BN_CTX_free(bn_ctx);
2876         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2877         if (clnt_ecdh != NULL)
2878                 EC_KEY_free(clnt_ecdh);
2879         EVP_PKEY_free(srvr_pub_pkey);
2880 #endif
2881         return(-1);
2882         }
2883
2884 int ssl3_send_client_verify(SSL *s)
2885         {
2886         unsigned char *p,*d;
2887         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2888         EVP_PKEY *pkey;
2889         EVP_PKEY_CTX *pctx=NULL;
2890         EVP_MD_CTX mctx;
2891         unsigned u=0;
2892         unsigned long n;
2893         int j;
2894
2895         EVP_MD_CTX_init(&mctx);
2896
2897         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2898                 {
2899                 d=(unsigned char *)s->init_buf->data;
2900                 p= &(d[4]);
2901                 pkey=s->cert->key->privatekey;
2902 /* Create context from key and test if sha1 is allowed as digest */
2903                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2904                 EVP_PKEY_sign_init(pctx);
2905                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2906                         {
2907                         if (TLS1_get_version(s) < TLS1_2_VERSION)
2908                                 s->method->ssl3_enc->cert_verify_mac(s,
2909                                                 NID_sha1,
2910                                                 &(data[MD5_DIGEST_LENGTH]));
2911                         }
2912                 else
2913                         {
2914                         ERR_clear_error();
2915                         }
2916                 /* For TLS v1.2 send signature algorithm and signature
2917                  * using agreed digest and cached handshake records.
2918                  */
2919                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2920                         {
2921                         long hdatalen = 0;
2922                         void *hdata;
2923                         const EVP_MD *md = s->cert->key->digest;
2924                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2925                                                                 &hdata);
2926                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2927                                 {
2928                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2929                                                 ERR_R_INTERNAL_ERROR);
2930                                 goto err;
2931                                 }
2932                         p += 2;
2933 #ifdef SSL_DEBUG
2934                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2935                                                         EVP_MD_name(md));
2936 #endif
2937                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2938                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2939                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2940                                 {
2941                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2942                                                 ERR_R_EVP_LIB);
2943                                 goto err;
2944                                 }
2945                         s2n(u,p);
2946                         n = u + 4;
2947                         if (!ssl3_digest_cached_records(s))
2948                                 goto err;
2949                         }
2950                 else
2951 #ifndef OPENSSL_NO_RSA
2952                 if (pkey->type == EVP_PKEY_RSA)
2953                         {
2954                         s->method->ssl3_enc->cert_verify_mac(s,
2955                                 NID_md5,
2956                                 &(data[0]));
2957                         if (RSA_sign(NID_md5_sha1, data,
2958                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2959                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2960                                 {
2961                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2962                                 goto err;
2963                                 }
2964                         s2n(u,p);
2965                         n=u+2;
2966                         }
2967                 else
2968 #endif
2969 #ifndef OPENSSL_NO_DSA
2970                         if (pkey->type == EVP_PKEY_DSA)
2971                         {
2972                         if (!DSA_sign(pkey->save_type,
2973                                 &(data[MD5_DIGEST_LENGTH]),
2974                                 SHA_DIGEST_LENGTH,&(p[2]),
2975                                 (unsigned int *)&j,pkey->pkey.dsa))
2976                                 {
2977                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2978                                 goto err;
2979                                 }
2980                         s2n(j,p);
2981                         n=j+2;
2982                         }
2983                 else
2984 #endif
2985 #ifndef OPENSSL_NO_ECDSA
2986                         if (pkey->type == EVP_PKEY_EC)
2987                         {
2988                         if (!ECDSA_sign(pkey->save_type,
2989                                 &(data[MD5_DIGEST_LENGTH]),
2990                                 SHA_DIGEST_LENGTH,&(p[2]),
2991                                 (unsigned int *)&j,pkey->pkey.ec))
2992                                 {
2993                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2994                                     ERR_R_ECDSA_LIB);
2995                                 goto err;
2996                                 }
2997                         s2n(j,p);
2998                         n=j+2;
2999                         }
3000                 else
3001 #endif
3002                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3003                 {
3004                 unsigned char signbuf[64];
3005                 int i;
3006                 size_t sigsize=64;
3007                 s->method->ssl3_enc->cert_verify_mac(s,
3008                         NID_id_GostR3411_94,
3009                         data);
3010                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3011                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3012                         ERR_R_INTERNAL_ERROR);
3013                         goto err;
3014                 }
3015                 for (i=63,j=0; i>=0; j++, i--) {
3016                         p[2+j]=signbuf[i];
3017                 }
3018                 s2n(j,p);
3019                 n=j+2;
3020                 }
3021                 else
3022                 {
3023                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3024                         goto err;
3025                 }
3026                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3027                 l2n3(n,d);
3028
3029                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3030                 s->init_num=(int)n+4;
3031                 s->init_off=0;
3032                 }
3033         EVP_MD_CTX_cleanup(&mctx);
3034         EVP_PKEY_CTX_free(pctx);
3035         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3036 err:
3037         EVP_MD_CTX_cleanup(&mctx);
3038         EVP_PKEY_CTX_free(pctx);
3039         return(-1);
3040         }
3041
3042 int ssl3_send_client_certificate(SSL *s)
3043         {
3044         X509 *x509=NULL;
3045         EVP_PKEY *pkey=NULL;
3046         int i;
3047         unsigned long l;
3048
3049         if (s->state == SSL3_ST_CW_CERT_A)
3050                 {
3051                 if ((s->cert == NULL) ||
3052                         (s->cert->key->x509 == NULL) ||
3053                         (s->cert->key->privatekey == NULL))
3054                         s->state=SSL3_ST_CW_CERT_B;
3055                 else
3056                         s->state=SSL3_ST_CW_CERT_C;
3057                 }
3058
3059         /* We need to get a client cert */
3060         if (s->state == SSL3_ST_CW_CERT_B)
3061                 {
3062                 /* If we get an error, we need to
3063                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3064                  * We then get retied later */
3065                 i=0;
3066                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3067                 if (i < 0)
3068                         {
3069                         s->rwstate=SSL_X509_LOOKUP;
3070                         return(-1);
3071                         }
3072                 s->rwstate=SSL_NOTHING;
3073                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3074                         {
3075                         s->state=SSL3_ST_CW_CERT_B;
3076                         if (    !SSL_use_certificate(s,x509) ||
3077                                 !SSL_use_PrivateKey(s,pkey))
3078                                 i=0;
3079                         }
3080                 else if (i == 1)
3081                         {
3082                         i=0;
3083                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3084                         }
3085
3086                 if (x509 != NULL) X509_free(x509);
3087                 if (pkey != NULL) EVP_PKEY_free(pkey);
3088                 if (i == 0)
3089                         {
3090                         if (s->version == SSL3_VERSION)
3091                                 {
3092                                 s->s3->tmp.cert_req=0;
3093                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3094                                 return(1);
3095                                 }
3096                         else
3097                                 {
3098                                 s->s3->tmp.cert_req=2;
3099                                 }
3100                         }
3101
3102                 /* Ok, we have a cert */
3103                 s->state=SSL3_ST_CW_CERT_C;
3104                 }
3105
3106         if (s->state == SSL3_ST_CW_CERT_C)
3107                 {
3108                 s->state=SSL3_ST_CW_CERT_D;
3109                 l=ssl3_output_cert_chain(s,
3110                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3111                 s->init_num=(int)l;
3112                 s->init_off=0;
3113                 }
3114         /* SSL3_ST_CW_CERT_D */
3115         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3116         }
3117
3118 #define has_bits(i,m)   (((i)&(m)) == (m))
3119
3120 int ssl3_check_cert_and_algorithm(SSL *s)
3121         {
3122         int i,idx;
3123         long alg_k,alg_a;
3124         EVP_PKEY *pkey=NULL;
3125         SESS_CERT *sc;
3126 #ifndef OPENSSL_NO_RSA
3127         RSA *rsa;
3128 #endif
3129 #ifndef OPENSSL_NO_DH
3130         DH *dh;
3131 #endif
3132
3133         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3134         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3135
3136         /* we don't have a certificate */
3137         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3138                 return(1);
3139
3140         sc=s->session->sess_cert;
3141         if (sc == NULL)
3142                 {
3143                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3144                 goto err;
3145                 }
3146
3147 #ifndef OPENSSL_NO_RSA
3148         rsa=s->session->sess_cert->peer_rsa_tmp;
3149 #endif
3150 #ifndef OPENSSL_NO_DH
3151         dh=s->session->sess_cert->peer_dh_tmp;
3152 #endif
3153
3154         /* This is the passed certificate */
3155
3156         idx=sc->peer_cert_type;
3157 #ifndef OPENSSL_NO_ECDH
3158         if (idx == SSL_PKEY_ECC)
3159                 {
3160                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3161                                                                 s) == 0)
3162                         { /* check failed */
3163                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3164                         goto f_err;
3165                         }
3166                 else
3167                         {
3168                         return 1;
3169                         }
3170                 }
3171 #endif
3172         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3173         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3174         EVP_PKEY_free(pkey);
3175
3176
3177         /* Check that we have a certificate if we require one */
3178         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3179                 {
3180                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3181                 goto f_err;
3182                 }
3183 #ifndef OPENSSL_NO_DSA
3184         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3185                 {
3186                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3187                 goto f_err;
3188                 }
3189 #endif
3190 #ifndef OPENSSL_NO_RSA
3191         if ((alg_k & SSL_kRSA) &&
3192                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3193                 {
3194                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3195                 goto f_err;
3196                 }
3197 #endif
3198 #ifndef OPENSSL_NO_DH
3199         if ((alg_k & SSL_kEDH) &&
3200                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3201                 {
3202                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3203                 goto f_err;
3204                 }
3205         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3206                 {
3207                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3208                 goto f_err;
3209                 }
3210 #ifndef OPENSSL_NO_DSA
3211         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3212                 {
3213                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3214                 goto f_err;
3215                 }
3216 #endif
3217 #endif
3218
3219         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3220                 {
3221 #ifndef OPENSSL_NO_RSA
3222                 if (alg_k & SSL_kRSA)
3223                         {
3224                         if (rsa == NULL
3225                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3226                                 {
3227                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3228                                 goto f_err;
3229                                 }
3230                         }
3231                 else
3232 #endif
3233 #ifndef OPENSSL_NO_DH
3234                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3235                             {
3236                             if (dh == NULL
3237                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3238                                 {
3239                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3240                                 goto f_err;
3241                                 }
3242                         }
3243                 else
3244 #endif
3245                         {
3246                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3247                         goto f_err;
3248                         }
3249                 }
3250         return(1);
3251 f_err:
3252         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3253 err:
3254         return(0);
3255         }
3256
3257 /* Check to see if handshake is full or resumed. Usually this is just a
3258  * case of checking to see if a cache hit has occurred. In the case of
3259  * session tickets we have to check the next message to be sure.
3260  */
3261
3262 #ifndef OPENSSL_NO_TLSEXT
3263 # ifndef OPENSSL_NO_NEXTPROTONEG
3264 int ssl3_send_next_proto(SSL *s)
3265         {
3266         unsigned int len, padding_len;
3267         unsigned char *d;
3268
3269         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3270                 {
3271                 len = s->next_proto_negotiated_len;
3272                 padding_len = 32 - ((len + 2) % 32);
3273                 d = (unsigned char *)s->init_buf->data;
3274                 d[4] = len;
3275                 memcpy(d + 5, s->next_proto_negotiated, len);
3276                 d[5 + len] = padding_len;
3277                 memset(d + 6 + len, 0, padding_len);
3278                 *(d++)=SSL3_MT_NEXT_PROTO;
3279                 l2n3(2 + len + padding_len, d);
3280                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3281                 s->init_num = 4 + 2 + len + padding_len;
3282                 s->init_off = 0;
3283                 }
3284
3285         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3286         }
3287 # endif
3288
3289 int ssl3_check_finished(SSL *s)
3290         {
3291         int ok;
3292         long n;
3293         /* If we have no ticket it cannot be a resumed session. */
3294         if (!s->session->tlsext_tick)
3295                 return 1;
3296         /* this function is called when we really expect a Certificate
3297          * message, so permit appropriate message length */
3298         n=s->method->ssl_get_message(s,
3299                 SSL3_ST_CR_CERT_A,
3300                 SSL3_ST_CR_CERT_B,
3301                 -1,
3302                 s->max_cert_list,
3303                 &ok);
3304         if (!ok) return((int)n);
3305         s->s3->tmp.reuse_message = 1;
3306         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3307                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3308                 return 2;
3309
3310         return 1;
3311         }
3312 #endif
3313
3314 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3315         {
3316         int i = 0;
3317 #ifndef OPENSSL_NO_ENGINE
3318         if (s->ctx->client_cert_engine)
3319                 {
3320                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3321                                                 SSL_get_client_CA_list(s),
3322                                                 px509, ppkey, NULL, NULL, NULL);
3323                 if (i != 0)
3324                         return i;
3325                 }
3326 #endif
3327         if (s->ctx->client_cert_cb)
3328                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3329         return i;
3330         }