ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver);
 168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 188         int ret= -1;
 189         int new_state,state,skip=0;
 190
 191         RAND_add(&Time,sizeof(Time),0);
 192         ERR_clear_error();
 193         clear_sys_error();
 194
 195         if (s->info_callback != NULL)
 196                 cb=s->info_callback;
 197         else if (s->ctx->info_callback != NULL)
 198                 cb=s->ctx->info_callback;
 199
 200         s->in_handshake++;
 201         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 202
 203         for (;;)
 204                 {
 205                 state=s->state;
 206
 207                 switch(s->state)
 208                         {
 209                 case SSL_ST_RENEGOTIATE:
 210                         s->renegotiate=1;
 211                         s->state=SSL_ST_CONNECT;
 212                         s->ctx->stats.sess_connect_renegotiate++;
 213                         /* break */
 214                 case SSL_ST_BEFORE:
 215                 case SSL_ST_CONNECT:
 216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 217                 case SSL_ST_OK|SSL_ST_CONNECT:
 218
 219                         s->server=0;
 220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 221
 222                         if ((s->version & 0xff00 ) != 0x0300)
 223                                 {
 224                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 225                                 ret = -1;
 226                                 goto end;
 227                                 }
 228
 229                         /* s->version=SSL3_VERSION; */
 230                         s->type=SSL_ST_CONNECT;
 231
 232                         if (s->init_buf == NULL)
 233                                 {
 234                                 if ((buf=BUF_MEM_new()) == NULL)
 235                                         {
 236                                         ret= -1;
 237                                         goto end;
 238                                         }
 239                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 240                                         {
 241                                         ret= -1;
 242                                         goto end;
 243                                         }
 244                                 s->init_buf=buf;
 245                                 buf=NULL;
 246                                 }
 247
 248                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 249
 250                         /* setup buffing BIO */
 251                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 252
 253                         /* don't push the buffering BIO quite yet */
 254
 255                         ssl3_init_finished_mac(s);
 256
 257                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 258                         s->ctx->stats.sess_connect++;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_CW_CLNT_HELLO_A:
 263                 case SSL3_ST_CW_CLNT_HELLO_B:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 269                         s->init_num=0;
 270
 271                         /* turn on buffering for the next lot of output */
 272                         if (s->bbio != s->wbio)
 273                                 s->wbio=BIO_push(s->bbio,s->wbio);
 274
 275                         break;
 276
 277                 case SSL3_ST_CR_SRVR_HELLO_A:
 278                 case SSL3_ST_CR_SRVR_HELLO_B:
 279                         ret=ssl3_get_server_hello(s);
 280 #ifndef OPENSSL_NO_SRP
 281                         if (ret == 0 && s->s3->warn_alert == SSL_AD_MISSING_SRP_USERNAME)
 282                                 {
 283                                 if (!SRP_have_to_put_srp_username(s))
 284                                         {
 285                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_MISSING_SRP_USERNAME);
 286                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_USER_CANCELLED);
 287                                         goto end;
 288                                         }
 289                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 290                                 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 291                                 break;
 292                                 }
 293 #endif
 294                         if (ret <= 0) goto end;
 295
 296                         if (s->hit)
 297                                 s->state=SSL3_ST_CR_FINISHED_A;
 298                         else
 299                                 s->state=SSL3_ST_CR_CERT_A;
 300                         s->init_num=0;
 301                         break;
 302
 303                 case SSL3_ST_CR_CERT_A:
 304                 case SSL3_ST_CR_CERT_B:
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         ret=ssl3_check_finished(s);
 307                         if (ret <= 0) goto end;
 308                         if (ret == 2)
 309                                 {
 310                                 s->hit = 1;
 311                                 if (s->tlsext_ticket_expected)
 312                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 313                                 else
 314                                         s->state=SSL3_ST_CR_FINISHED_A;
 315                                 s->init_num=0;
 316                                 break;
 317                                 }
 318 #endif
 319                         /* Check if it is anon DH/ECDH */
 320                         /* or PSK */
 321                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 322                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 323                                 {
 324                                 ret=ssl3_get_server_certificate(s);
 325                                 if (ret <= 0) goto end;
 326 #ifndef OPENSSL_NO_TLSEXT
 327                                 if (s->tlsext_status_expected)
 328                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 329                                 else
 330                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 331                                 }
 332                         else
 333                                 {
 334                                 skip = 1;
 335                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 336                                 }
 337 #else
 338                                 }
 339                         else
 340                                 skip=1;
 341
 342                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 343 #endif
 344                         s->init_num=0;
 345                         break;
 346
 347                 case SSL3_ST_CR_KEY_EXCH_A:
 348                 case SSL3_ST_CR_KEY_EXCH_B:
 349                         ret=ssl3_get_key_exchange(s);
 350                         if (ret <= 0) goto end;
 351                         s->state=SSL3_ST_CR_CERT_REQ_A;
 352                         s->init_num=0;
 353
 354                         /* at this point we check that we have the
 355                          * required stuff from the server */
 356                         if (!ssl3_check_cert_and_algorithm(s))
 357                                 {
 358                                 ret= -1;
 359                                 goto end;
 360                                 }
 361                         break;
 362
 363                 case SSL3_ST_CR_CERT_REQ_A:
 364                 case SSL3_ST_CR_CERT_REQ_B:
 365                         ret=ssl3_get_certificate_request(s);
 366                         if (ret <= 0) goto end;
 367                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 368                         s->init_num=0;
 369                         break;
 370
 371                 case SSL3_ST_CR_SRVR_DONE_A:
 372                 case SSL3_ST_CR_SRVR_DONE_B:
 373                         ret=ssl3_get_server_done(s);
 374                         if (ret <= 0) goto end;
 375 #ifndef OPENSSL_NO_SRP
 376                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 377                                 {
 378                                 if ((ret = SRP_Calc_A_param(s))<=0)
 379                                         {
 380                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 381                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 382                                         goto end;
 383                                         }
 384                                 }
 385 #endif
 386                         if (s->s3->tmp.cert_req)
 387                                 s->state=SSL3_ST_CW_CERT_A;
 388                         else
 389                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 390                         s->init_num=0;
 391
 392                         break;
 393
 394                 case SSL3_ST_CW_CERT_A:
 395                 case SSL3_ST_CW_CERT_B:
 396                 case SSL3_ST_CW_CERT_C:
 397                 case SSL3_ST_CW_CERT_D:
 398                         ret=ssl3_send_client_certificate(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 401                         s->init_num=0;
 402                         break;
 403
 404                 case SSL3_ST_CW_KEY_EXCH_A:
 405                 case SSL3_ST_CW_KEY_EXCH_B:
 406                         ret=ssl3_send_client_key_exchange(s);
 407                         if (ret <= 0) goto end;
 408                         /* EAY EAY EAY need to check for DH fix cert
 409                          * sent back */
 410                         /* For TLS, cert_req is set to 2, so a cert chain
 411                          * of nothing is sent, but no verify packet is sent */
 412                         /* XXX: For now, we do not support client
 413                          * authentication in ECDH cipher suites with
 414                          * ECDH (rather than ECDSA) certificates.
 415                          * We need to skip the certificate verify
 416                          * message when client's ECDH public key is sent
 417                          * inside the client certificate.
 418                          */
 419                         if (s->s3->tmp.cert_req == 1)
 420                                 {
 421                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 422                                 }
 423                         else
 424                                 {
 425                                 s->state=SSL3_ST_CW_CHANGE_A;
 426                                 s->s3->change_cipher_spec=0;
 427                                 }
 428                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 429                                 {
 430                                 s->state=SSL3_ST_CW_CHANGE_A;
 431                                 s->s3->change_cipher_spec=0;
 432                                 }
 433
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_CW_CERT_VRFY_A:
 438                 case SSL3_ST_CW_CERT_VRFY_B:
 439                         ret=ssl3_send_client_verify(s);
 440                         if (ret <= 0) goto end;
 441                         s->state=SSL3_ST_CW_CHANGE_A;
 442                         s->init_num=0;
 443                         s->s3->change_cipher_spec=0;
 444                         break;
 445
 446                 case SSL3_ST_CW_CHANGE_A:
 447                 case SSL3_ST_CW_CHANGE_B:
 448                         ret=ssl3_send_change_cipher_spec(s,
 449                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_FINISHED_A;
 452                         s->init_num=0;
 453
 454                         s->session->cipher=s->s3->tmp.new_cipher;
 455 #ifdef OPENSSL_NO_COMP
 456                         s->session->compress_meth=0;
 457 #else
 458                         if (s->s3->tmp.new_compression == NULL)
 459                                 s->session->compress_meth=0;
 460                         else
 461                                 s->session->compress_meth=
 462                                         s->s3->tmp.new_compression->id;
 463 #endif
 464                         if (!s->method->ssl3_enc->setup_key_block(s))
 465                                 {
 466                                 ret= -1;
 467                                 goto end;
 468                                 }
 469
 470                         if (!s->method->ssl3_enc->change_cipher_state(s,
 471                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 472                                 {
 473                                 ret= -1;
 474                                 goto end;
 475                                 }
 476
 477                         break;
 478
 479                 case SSL3_ST_CW_FINISHED_A:
 480                 case SSL3_ST_CW_FINISHED_B:
 481                         ret=ssl3_send_finished(s,
 482                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 483                                 s->method->ssl3_enc->client_finished_label,
 484                                 s->method->ssl3_enc->client_finished_label_len);
 485                         if (ret <= 0) goto end;
 486                         s->state=SSL3_ST_CW_FLUSH;
 487
 488                         /* clear flags */
 489                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 490                         if (s->hit)
 491                                 {
 492                                 s->s3->tmp.next_state=SSL_ST_OK;
 493                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 494                                         {
 495                                         s->state=SSL_ST_OK;
 496                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 497                                         s->s3->delay_buf_pop_ret=0;
 498                                         }
 499                                 }
 500                         else
 501                                 {
 502 #ifndef OPENSSL_NO_TLSEXT
 503                                 /* Allow NewSessionTicket if ticket expected */
 504                                 if (s->tlsext_ticket_expected)
 505                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 506                                 else
 507 #endif
 508
 509                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 510                                 }
 511                         s->init_num=0;
 512                         break;
 513
 514 #ifndef OPENSSL_NO_TLSEXT
 515                 case SSL3_ST_CR_SESSION_TICKET_A:
 516                 case SSL3_ST_CR_SESSION_TICKET_B:
 517                         ret=ssl3_get_new_session_ticket(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CR_FINISHED_A;
 520                         s->init_num=0;
 521                 break;
 522
 523                 case SSL3_ST_CR_CERT_STATUS_A:
 524                 case SSL3_ST_CR_CERT_STATUS_B:
 525                         ret=ssl3_get_cert_status(s);
 526                         if (ret <= 0) goto end;
 527                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 528                         s->init_num=0;
 529                 break;
 530 #endif
 531
 532                 case SSL3_ST_CR_FINISHED_A:
 533                 case SSL3_ST_CR_FINISHED_B:
 534
 535                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 536                                 SSL3_ST_CR_FINISHED_B);
 537                         if (ret <= 0) goto end;
 538
 539                         if (s->hit)
 540                                 s->state=SSL3_ST_CW_CHANGE_A;
 541                         else
 542                                 s->state=SSL_ST_OK;
 543                         s->init_num=0;
 544                         break;
 545
 546                 case SSL3_ST_CW_FLUSH:
 547                         s->rwstate=SSL_WRITING;
 548                         if (BIO_flush(s->wbio) <= 0)
 549                                 {
 550                                 ret= -1;
 551                                 goto end;
 552                                 }
 553                         s->rwstate=SSL_NOTHING;
 554                         s->state=s->s3->tmp.next_state;
 555                         break;
 556
 557                 case SSL_ST_OK:
 558                         /* clean a few things up */
 559                         ssl3_cleanup_key_block(s);
 560
 561                         if (s->init_buf != NULL)
 562                                 {
 563                                 BUF_MEM_free(s->init_buf);
 564                                 s->init_buf=NULL;
 565                                 }
 566
 567                         /* If we are not 'joining' the last two packets,
 568                          * remove the buffering now */
 569                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 570                                 ssl_free_wbio_buffer(s);
 571                         /* else do it later in ssl3_write */
 572
 573                         s->init_num=0;
 574                         s->renegotiate=0;
 575                         s->new_session=0;
 576
 577                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 578                         if (s->hit) s->ctx->stats.sess_hit++;
 579
 580                         ret=1;
 581                         /* s->server=0; */
 582                         s->handshake_func=ssl3_connect;
 583                         s->ctx->stats.sess_connect_good++;
 584
 585                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 586
 587                         goto end;
 588                         /* break; */
 589
 590                 default:
 591                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 592                         ret= -1;
 593                         goto end;
 594                         /* break; */
 595                         }
 596
 597                 /* did we do anything */
 598                 if (!s->s3->tmp.reuse_message && !skip)
 599                         {
 600                         if (s->debug)
 601                                 {
 602                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 603                                         goto end;
 604                                 }
 605
 606                         if ((cb != NULL) && (s->state != state))
 607                                 {
 608                                 new_state=s->state;
 609                                 s->state=state;
 610                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 611                                 s->state=new_state;
 612                                 }
 613                         }
 614                 skip=0;
 615                 }
 616 end:
 617         s->in_handshake--;
 618         if (buf != NULL)
 619                 BUF_MEM_free(buf);
 620         if (cb != NULL)
 621                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 622         return(ret);
 623         }
 624
 625
 626 int ssl3_client_hello(SSL *s)
 627         {
 628         unsigned char *buf;
 629         unsigned char *p,*d;
 630         int i;
 631         unsigned long Time,l;
 632 #ifndef OPENSSL_NO_COMP
 633         int j;
 634         SSL_COMP *comp;
 635 #endif
 636
 637         buf=(unsigned char *)s->init_buf->data;
 638         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 639                 {
 640                 SSL_SESSION *sess = s->session;
 641                 if ((sess == NULL) ||
 642                         (sess->ssl_version != s->version) ||
 643 #ifdef OPENSSL_NO_TLSEXT
 644                         !sess->session_id_length ||
 645 #else
 646                         (!sess->session_id_length && !sess->tlsext_tick) ||
 647 #endif
 648                         (sess->not_resumable))
 649                         {
 650                         if (!ssl_get_new_session(s,0))
 651                                 goto err;
 652                         }
 653                 /* else use the pre-loaded session */
 654
 655                 p=s->s3->client_random;
 656                 Time=(unsigned long)time(NULL);                 /* Time */
 657                 l2n(Time,p);
 658                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 659                         goto err;
 660
 661                 /* Do the message type and length last */
 662                 d=p= &(buf[4]);
 663
 664                 *(p++)=s->version>>8;
 665                 *(p++)=s->version&0xff;
 666                 s->client_version=s->version;
 667
 668                 /* Random stuff */
 669                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 670                 p+=SSL3_RANDOM_SIZE;
 671
 672                 /* Session ID */
 673                 if (s->new_session)
 674                         i=0;
 675                 else
 676                         i=s->session->session_id_length;
 677                 *(p++)=i;
 678                 if (i != 0)
 679                         {
 680                         if (i > (int)sizeof(s->session->session_id))
 681                                 {
 682                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 683                                 goto err;
 684                                 }
 685                         memcpy(p,s->session->session_id,i);
 686                         p+=i;
 687                         }
 688
 689                 /* Ciphers supported */
 690                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 691                 if (i == 0)
 692                         {
 693                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 694                         goto err;
 695                         }
 696                 s2n(i,p);
 697                 p+=i;
 698
 699                 /* COMPRESSION */
 700 #ifdef OPENSSL_NO_COMP
 701                 *(p++)=1;
 702 #else
 703
 704                 if ((s->options & SSL_OP_NO_COMPRESSION)
 705                                         || !s->ctx->comp_methods)
 706                         j=0;
 707                 else
 708                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 709                 *(p++)=1+j;
 710                 for (i=0; i<j; i++)
 711                         {
 712                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 713                         *(p++)=comp->id;
 714                         }
 715 #endif
 716                 *(p++)=0; /* Add the NULL method */
 717
 718 #ifndef OPENSSL_NO_TLSEXT
 719                 /* TLS extensions*/
 720                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 721                         {
 722                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 723                         goto err;
 724                         }
 725                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 726                         {
 727                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 728                         goto err;
 729                         }
 730 #endif
 731
 732                 l=(p-d);
 733                 d=buf;
 734                 *(d++)=SSL3_MT_CLIENT_HELLO;
 735                 l2n3(l,d);
 736
 737                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 738                 /* number of bytes to write */
 739                 s->init_num=p-buf;
 740                 s->init_off=0;
 741                 }
 742
 743         /* SSL3_ST_CW_CLNT_HELLO_B */
 744         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 745 err:
 746         return(-1);
 747         }
 748
 749 int ssl3_get_server_hello(SSL *s)
 750         {
 751         STACK_OF(SSL_CIPHER) *sk;
 752         const SSL_CIPHER *c;
 753         unsigned char *p,*d;
 754         int i,al,ok;
 755         unsigned int j;
 756         long n;
 757 #ifndef OPENSSL_NO_COMP
 758         SSL_COMP *comp;
 759 #endif
 760
 761         n=s->method->ssl_get_message(s,
 762                 SSL3_ST_CR_SRVR_HELLO_A,
 763                 SSL3_ST_CR_SRVR_HELLO_B,
 764                 -1,
 765                 20000, /* ?? */
 766                 &ok);
 767
 768         if (!ok) return((int)n);
 769
 770         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 771                 {
 772                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 773                         {
 774                         if ( s->d1->send_cookie == 0)
 775                                 {
 776                                 s->s3->tmp.reuse_message = 1;
 777                                 return 1;
 778                                 }
 779                         else /* already sent a cookie */
 780                                 {
 781                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 782                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 783                                 goto f_err;
 784                                 }
 785                         }
 786                 }
 787
 788         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 789                 {
 790                 al=SSL_AD_UNEXPECTED_MESSAGE;
 791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 792                 goto f_err;
 793                 }
 794
 795         d=p=(unsigned char *)s->init_msg;
 796
 797         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 798                 {
 799                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 800                 s->version=(s->version&0xff00)|p[1];
 801                 al=SSL_AD_PROTOCOL_VERSION;
 802                 goto f_err;
 803                 }
 804         p+=2;
 805
 806         /* load the server hello data */
 807         /* load the server random */
 808         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 809         p+=SSL3_RANDOM_SIZE;
 810
 811         /* get the session-id */
 812         j= *(p++);
 813
 814         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 815                 {
 816                 al=SSL_AD_ILLEGAL_PARAMETER;
 817                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 818                 goto f_err;
 819                 }
 820
 821 #ifndef OPENSSL_NO_TLSEXT
 822         /* check if we want to resume the session based on external pre-shared secret */
 823         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 824                 {
 825                 SSL_CIPHER *pref_cipher=NULL;
 826                 s->session->master_key_length=sizeof(s->session->master_key);
 827                 if (s->tls_session_secret_cb(s, s->session->master_key,
 828                                              &s->session->master_key_length,
 829                                              NULL, &pref_cipher,
 830                                              s->tls_session_secret_cb_arg))
 831                         {
 832                         s->session->cipher = pref_cipher ?
 833                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 834                         }
 835                 }
 836 #endif /* OPENSSL_NO_TLSEXT */
 837
 838         if (j != 0 && j == s->session->session_id_length
 839             && memcmp(p,s->session->session_id,j) == 0)
 840             {
 841             if(s->sid_ctx_length != s->session->sid_ctx_length
 842                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 843                 {
 844                 /* actually a client application bug */
 845                 al=SSL_AD_ILLEGAL_PARAMETER;
 846                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 847                 goto f_err;
 848                 }
 849             s->hit=1;
 850             }
 851         else    /* a miss or crap from the other end */
 852                 {
 853                 /* If we were trying for session-id reuse, make a new
 854                  * SSL_SESSION so we don't stuff up other people */
 855                 s->hit=0;
 856                 if (s->session->session_id_length > 0)
 857                         {
 858                         if (!ssl_get_new_session(s,0))
 859                                 {
 860                                 al=SSL_AD_INTERNAL_ERROR;
 861                                 goto f_err;
 862                                 }
 863                         }
 864                 s->session->session_id_length=j;
 865                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 866                 }
 867         p+=j;
 868         c=ssl_get_cipher_by_char(s,p);
 869         if (c == NULL)
 870                 {
 871                 /* unknown cipher */
 872                 al=SSL_AD_ILLEGAL_PARAMETER;
 873                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 874                 goto f_err;
 875                 }
 876         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 877
 878         sk=ssl_get_ciphers_by_id(s);
 879         i=sk_SSL_CIPHER_find(sk,c);
 880         if (i < 0)
 881                 {
 882                 /* we did not say we would use this cipher */
 883                 al=SSL_AD_ILLEGAL_PARAMETER;
 884                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 885                 goto f_err;
 886                 }
 887
 888         /* Depending on the session caching (internal/external), the cipher
 889            and/or cipher_id values may not be set. Make sure that
 890            cipher_id is set and use it for comparison. */
 891         if (s->session->cipher)
 892                 s->session->cipher_id = s->session->cipher->id;
 893         if (s->hit && (s->session->cipher_id != c->id))
 894                 {
 895 /* Workaround is now obsolete */
 896 #if 0
 897                 if (!(s->options &
 898                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 899 #endif
 900                         {
 901                         al=SSL_AD_ILLEGAL_PARAMETER;
 902                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 903                         goto f_err;
 904                         }
 905                 }
 906         s->s3->tmp.new_cipher=c;
 907         /* Don't digest cached records if TLS v1.2: we may need them for
 908          * client authentication.
 909          */
 910         if (s->version < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 911                 goto f_err;
 912         /* lets get the compression algorithm */
 913         /* COMPRESSION */
 914 #ifdef OPENSSL_NO_COMP
 915         if (*(p++) != 0)
 916                 {
 917                 al=SSL_AD_ILLEGAL_PARAMETER;
 918                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 919                 goto f_err;
 920                 }
 921         /* If compression is disabled we'd better not try to resume a session
 922          * using compression.
 923          */
 924         if (s->session->compress_meth != 0)
 925                 {
 926                 al=SSL_AD_INTERNAL_ERROR;
 927                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 928                 goto f_err;
 929                 }
 930 #else
 931         j= *(p++);
 932         if (s->hit && j != s->session->compress_meth)
 933                 {
 934                 al=SSL_AD_ILLEGAL_PARAMETER;
 935                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 936                 goto f_err;
 937                 }
 938         if (j == 0)
 939                 comp=NULL;
 940         else if (s->options & SSL_OP_NO_COMPRESSION)
 941                 {
 942                 al=SSL_AD_ILLEGAL_PARAMETER;
 943                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 944                 goto f_err;
 945                 }
 946         else
 947                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 948
 949         if ((j != 0) && (comp == NULL))
 950                 {
 951                 al=SSL_AD_ILLEGAL_PARAMETER;
 952                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 953                 goto f_err;
 954                 }
 955         else
 956                 {
 957                 s->s3->tmp.new_compression=comp;
 958                 }
 959 #endif
 960
 961 #ifndef OPENSSL_NO_TLSEXT
 962         /* TLS extensions*/
 963         if (s->version >= SSL3_VERSION)
 964                 {
 965                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 966                         {
 967                         /* 'al' set by ssl_parse_serverhello_tlsext */
 968                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 969                         goto f_err;
 970                         }
 971                 if (ssl_check_serverhello_tlsext(s) <= 0)
 972                         {
 973                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 974                                 goto err;
 975                         }
 976                 }
 977 #endif
 978
 979         if (p != (d+n))
 980                 {
 981                 /* wrong packet length */
 982                 al=SSL_AD_DECODE_ERROR;
 983                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 984                 goto err;
 985                 }
 986
 987         return(1);
 988 f_err:
 989         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 990 err:
 991         return(-1);
 992         }
 993
 994 int ssl3_get_server_certificate(SSL *s)
 995         {
 996         int al,i,ok,ret= -1;
 997         unsigned long n,nc,llen,l;
 998         X509 *x=NULL;
 999         const unsigned char *q,*p;
1000         unsigned char *d;
1001         STACK_OF(X509) *sk=NULL;
1002         SESS_CERT *sc;
1003         EVP_PKEY *pkey=NULL;
1004         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1005
1006         n=s->method->ssl_get_message(s,
1007                 SSL3_ST_CR_CERT_A,
1008                 SSL3_ST_CR_CERT_B,
1009                 -1,
1010                 s->max_cert_list,
1011                 &ok);
1012
1013         if (!ok) return((int)n);
1014
1015         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1016                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1017                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1018                 {
1019                 s->s3->tmp.reuse_message=1;
1020                 return(1);
1021                 }
1022
1023         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1024                 {
1025                 al=SSL_AD_UNEXPECTED_MESSAGE;
1026                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1027                 goto f_err;
1028                 }
1029         p=d=(unsigned char *)s->init_msg;
1030
1031         if ((sk=sk_X509_new_null()) == NULL)
1032                 {
1033                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1034                 goto err;
1035                 }
1036
1037         n2l3(p,llen);
1038         if (llen+3 != n)
1039                 {
1040                 al=SSL_AD_DECODE_ERROR;
1041                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1042                 goto f_err;
1043                 }
1044         for (nc=0; nc<llen; )
1045                 {
1046                 n2l3(p,l);
1047                 if ((l+nc+3) > llen)
1048                         {
1049                         al=SSL_AD_DECODE_ERROR;
1050                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1051                         goto f_err;
1052                         }
1053
1054                 q=p;
1055                 x=d2i_X509(NULL,&q,l);
1056                 if (x == NULL)
1057                         {
1058                         al=SSL_AD_BAD_CERTIFICATE;
1059                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1060                         goto f_err;
1061                         }
1062                 if (q != (p+l))
1063                         {
1064                         al=SSL_AD_DECODE_ERROR;
1065                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1066                         goto f_err;
1067                         }
1068                 if (!sk_X509_push(sk,x))
1069                         {
1070                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1071                         goto err;
1072                         }
1073                 x=NULL;
1074                 nc+=l+3;
1075                 p=q;
1076                 }
1077
1078         i=ssl_verify_cert_chain(s,sk);
1079         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1080 #ifndef OPENSSL_NO_KRB5
1081             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1082                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1083 #endif /* OPENSSL_NO_KRB5 */
1084                 )
1085                 {
1086                 al=ssl_verify_alarm_type(s->verify_result);
1087                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1088                 goto f_err;
1089                 }
1090         ERR_clear_error(); /* but we keep s->verify_result */
1091
1092         sc=ssl_sess_cert_new();
1093         if (sc == NULL) goto err;
1094
1095         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1096         s->session->sess_cert=sc;
1097
1098         sc->cert_chain=sk;
1099         /* Inconsistency alert: cert_chain does include the peer's
1100          * certificate, which we don't include in s3_srvr.c */
1101         x=sk_X509_value(sk,0);
1102         sk=NULL;
1103         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1104
1105         pkey=X509_get_pubkey(x);
1106
1107         /* VRS: allow null cert if auth == KRB5 */
1108         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1109                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1110                     ? 0 : 1;
1111
1112 #ifdef KSSL_DEBUG
1113         printf("pkey,x = %p, %p\n", pkey,x);
1114         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1115         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1116                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1117 #endif    /* KSSL_DEBUG */
1118
1119         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1120                 {
1121                 x=NULL;
1122                 al=SSL3_AL_FATAL;
1123                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1124                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1125                 goto f_err;
1126                 }
1127
1128         i=ssl_cert_type(x,pkey);
1129         if (need_cert && i < 0)
1130                 {
1131                 x=NULL;
1132                 al=SSL3_AL_FATAL;
1133                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1134                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1135                 goto f_err;
1136                 }
1137
1138         if (need_cert)
1139                 {
1140                 sc->peer_cert_type=i;
1141                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1142                 /* Why would the following ever happen?
1143                  * We just created sc a couple of lines ago. */
1144                 if (sc->peer_pkeys[i].x509 != NULL)
1145                         X509_free(sc->peer_pkeys[i].x509);
1146                 sc->peer_pkeys[i].x509=x;
1147                 sc->peer_key= &(sc->peer_pkeys[i]);
1148
1149                 if (s->session->peer != NULL)
1150                         X509_free(s->session->peer);
1151                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1152                 s->session->peer=x;
1153                 }
1154         else
1155                 {
1156                 sc->peer_cert_type=i;
1157                 sc->peer_key= NULL;
1158
1159                 if (s->session->peer != NULL)
1160                         X509_free(s->session->peer);
1161                 s->session->peer=NULL;
1162                 }
1163         s->session->verify_result = s->verify_result;
1164
1165         x=NULL;
1166         ret=1;
1167
1168         if (0)
1169                 {
1170 f_err:
1171                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1172                 }
1173 err:
1174         EVP_PKEY_free(pkey);
1175         X509_free(x);
1176         sk_X509_pop_free(sk,X509_free);
1177         return(ret);
1178         }
1179
1180 int ssl3_get_key_exchange(SSL *s)
1181         {
1182 #ifndef OPENSSL_NO_RSA
1183         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1184 #endif
1185         EVP_MD_CTX md_ctx;
1186         unsigned char *param,*p;
1187         int al,i,j,param_len,ok;
1188         long n,alg_k,alg_a;
1189         EVP_PKEY *pkey=NULL;
1190         const EVP_MD *md = NULL;
1191 #ifndef OPENSSL_NO_RSA
1192         RSA *rsa=NULL;
1193 #endif
1194 #ifndef OPENSSL_NO_DH
1195         DH *dh=NULL;
1196 #endif
1197 #ifndef OPENSSL_NO_ECDH
1198         EC_KEY *ecdh = NULL;
1199         BN_CTX *bn_ctx = NULL;
1200         EC_POINT *srvr_ecpoint = NULL;
1201         int curve_nid = 0;
1202         int encoded_pt_len = 0;
1203 #endif
1204
1205         /* use same message size as in ssl3_get_certificate_request()
1206          * as ServerKeyExchange message may be skipped */
1207         n=s->method->ssl_get_message(s,
1208                 SSL3_ST_CR_KEY_EXCH_A,
1209                 SSL3_ST_CR_KEY_EXCH_B,
1210                 -1,
1211                 s->max_cert_list,
1212                 &ok);
1213         if (!ok) return((int)n);
1214
1215         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1216                 {
1217 #ifndef OPENSSL_NO_PSK
1218                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1219                    omitted if no identity hint is sent. Set
1220                    session->sess_cert anyway to avoid problems
1221                    later.*/
1222                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1223                         {
1224                         s->session->sess_cert=ssl_sess_cert_new();
1225                         if (s->ctx->psk_identity_hint)
1226                                 OPENSSL_free(s->ctx->psk_identity_hint);
1227                         s->ctx->psk_identity_hint = NULL;
1228                         }
1229 #endif
1230                 s->s3->tmp.reuse_message=1;
1231                 return(1);
1232                 }
1233
1234         param=p=(unsigned char *)s->init_msg;
1235         if (s->session->sess_cert != NULL)
1236                 {
1237 #ifndef OPENSSL_NO_RSA
1238                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1239                         {
1240                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1241                         s->session->sess_cert->peer_rsa_tmp=NULL;
1242                         }
1243 #endif
1244 #ifndef OPENSSL_NO_DH
1245                 if (s->session->sess_cert->peer_dh_tmp)
1246                         {
1247                         DH_free(s->session->sess_cert->peer_dh_tmp);
1248                         s->session->sess_cert->peer_dh_tmp=NULL;
1249                         }
1250 #endif
1251 #ifndef OPENSSL_NO_ECDH
1252                 if (s->session->sess_cert->peer_ecdh_tmp)
1253                         {
1254                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1255                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1256                         }
1257 #endif
1258                 }
1259         else
1260                 {
1261                 s->session->sess_cert=ssl_sess_cert_new();
1262                 }
1263
1264         param_len=0;
1265         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1266         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1267         EVP_MD_CTX_init(&md_ctx);
1268
1269 #ifndef OPENSSL_NO_PSK
1270         if (alg_k & SSL_kPSK)
1271                 {
1272                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1273
1274                 al=SSL_AD_HANDSHAKE_FAILURE;
1275                 n2s(p,i);
1276                 param_len=i+2;
1277                 /* Store PSK identity hint for later use, hint is used
1278                  * in ssl3_send_client_key_exchange.  Assume that the
1279                  * maximum length of a PSK identity hint can be as
1280                  * long as the maximum length of a PSK identity. */
1281                 if (i > PSK_MAX_IDENTITY_LEN)
1282                         {
1283                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1284                                 SSL_R_DATA_LENGTH_TOO_LONG);
1285                         goto f_err;
1286                         }
1287                 if (param_len > n)
1288                         {
1289                         al=SSL_AD_DECODE_ERROR;
1290                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1291                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1292                         goto f_err;
1293                         }
1294                 /* If received PSK identity hint contains NULL
1295                  * characters, the hint is truncated from the first
1296                  * NULL. p may not be ending with NULL, so create a
1297                  * NULL-terminated string. */
1298                 memcpy(tmp_id_hint, p, i);
1299                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1300                 if (s->ctx->psk_identity_hint != NULL)
1301                         OPENSSL_free(s->ctx->psk_identity_hint);
1302                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1303                 if (s->ctx->psk_identity_hint == NULL)
1304                         {
1305                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1306                         goto f_err;
1307                         }
1308
1309                 p+=i;
1310                 n-=param_len;
1311                 }
1312         else
1313 #endif /* !OPENSSL_NO_PSK */
1314 #ifndef OPENSSL_NO_SRP
1315         if (alg_k & SSL_kSRP)
1316                 {
1317                 n2s(p,i);
1318                 param_len=i+2;
1319                 if (param_len > n)
1320                         {
1321                         al=SSL_AD_DECODE_ERROR;
1322                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1323                         goto f_err;
1324                         }
1325                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1326                         {
1327                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1328                         goto err;
1329                         }
1330                 p+=i;
1331
1332                 n2s(p,i);
1333                 param_len+=i+2;
1334                 if (param_len > n)
1335                         {
1336                         al=SSL_AD_DECODE_ERROR;
1337                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1338                         goto f_err;
1339                         }
1340                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1341                         {
1342                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1343                         goto err;
1344                         }
1345                 p+=i;
1346
1347                 i = (unsigned int)(p[0]);
1348                 p++;
1349                 param_len+=i+1;
1350                 if (param_len > n)
1351                         {
1352                         al=SSL_AD_DECODE_ERROR;
1353                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1354                         goto f_err;
1355                         }
1356                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1357                         {
1358                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1359                         goto err;
1360                         }
1361                 p+=i;
1362
1363                 n2s(p,i);
1364                 param_len+=i+2;
1365                 if (param_len > n)
1366                         {
1367                         al=SSL_AD_DECODE_ERROR;
1368                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1369                         goto f_err;
1370                         }
1371                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1372                         {
1373                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1374                         goto err;
1375                         }
1376                 p+=i;
1377                 n-=param_len;
1378
1379 /* We must check if there is a certificate */
1380 #ifndef OPENSSL_NO_RSA
1381                 if (alg_a & SSL_aRSA)
1382                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1383 #else
1384                 if (0)
1385                         ;
1386 #endif
1387 #ifndef OPENSSL_NO_DSA
1388                 else if (alg_a & SSL_aDSS)
1389                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1390 #endif
1391                 }
1392         else
1393 #endif /* !OPENSSL_NO_SRP */
1394 #ifndef OPENSSL_NO_RSA
1395         if (alg_k & SSL_kRSA)
1396                 {
1397                 if ((rsa=RSA_new()) == NULL)
1398                         {
1399                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1400                         goto err;
1401                         }
1402                 n2s(p,i);
1403                 param_len=i+2;
1404                 if (param_len > n)
1405                         {
1406                         al=SSL_AD_DECODE_ERROR;
1407                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1408                         goto f_err;
1409                         }
1410                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1411                         {
1412                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1413                         goto err;
1414                         }
1415                 p+=i;
1416
1417                 n2s(p,i);
1418                 param_len+=i+2;
1419                 if (param_len > n)
1420                         {
1421                         al=SSL_AD_DECODE_ERROR;
1422                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1423                         goto f_err;
1424                         }
1425                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1426                         {
1427                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1428                         goto err;
1429                         }
1430                 p+=i;
1431                 n-=param_len;
1432
1433                 /* this should be because we are using an export cipher */
1434                 if (alg_a & SSL_aRSA)
1435                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1436                 else
1437                         {
1438                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1439                         goto err;
1440                         }
1441                 s->session->sess_cert->peer_rsa_tmp=rsa;
1442                 rsa=NULL;
1443                 }
1444 #else /* OPENSSL_NO_RSA */
1445         if (0)
1446                 ;
1447 #endif
1448 #ifndef OPENSSL_NO_DH
1449         else if (alg_k & SSL_kEDH)
1450                 {
1451                 if ((dh=DH_new()) == NULL)
1452                         {
1453                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1454                         goto err;
1455                         }
1456                 n2s(p,i);
1457                 param_len=i+2;
1458                 if (param_len > n)
1459                         {
1460                         al=SSL_AD_DECODE_ERROR;
1461                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1462                         goto f_err;
1463                         }
1464                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1465                         {
1466                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1467                         goto err;
1468                         }
1469                 p+=i;
1470
1471                 n2s(p,i);
1472                 param_len+=i+2;
1473                 if (param_len > n)
1474                         {
1475                         al=SSL_AD_DECODE_ERROR;
1476                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1477                         goto f_err;
1478                         }
1479                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1480                         {
1481                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1482                         goto err;
1483                         }
1484                 p+=i;
1485
1486                 n2s(p,i);
1487                 param_len+=i+2;
1488                 if (param_len > n)
1489                         {
1490                         al=SSL_AD_DECODE_ERROR;
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1492                         goto f_err;
1493                         }
1494                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1495                         {
1496                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1497                         goto err;
1498                         }
1499                 p+=i;
1500                 n-=param_len;
1501
1502 #ifndef OPENSSL_NO_RSA
1503                 if (alg_a & SSL_aRSA)
1504                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1505 #else
1506                 if (0)
1507                         ;
1508 #endif
1509 #ifndef OPENSSL_NO_DSA
1510                 else if (alg_a & SSL_aDSS)
1511                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1512 #endif
1513                 /* else anonymous DH, so no certificate or pkey. */
1514
1515                 s->session->sess_cert->peer_dh_tmp=dh;
1516                 dh=NULL;
1517                 }
1518         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1519                 {
1520                 al=SSL_AD_ILLEGAL_PARAMETER;
1521                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1522                 goto f_err;
1523                 }
1524 #endif /* !OPENSSL_NO_DH */
1525
1526 #ifndef OPENSSL_NO_ECDH
1527         else if (alg_k & SSL_kEECDH)
1528                 {
1529                 EC_GROUP *ngroup;
1530                 const EC_GROUP *group;
1531
1532                 if ((ecdh=EC_KEY_new()) == NULL)
1533                         {
1534                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1535                         goto err;
1536                         }
1537
1538                 /* Extract elliptic curve parameters and the
1539                  * server's ephemeral ECDH public key.
1540                  * Keep accumulating lengths of various components in
1541                  * param_len and make sure it never exceeds n.
1542                  */
1543
1544                 /* XXX: For now we only support named (not generic) curves
1545                  * and the ECParameters in this case is just three bytes.
1546                  */
1547                 param_len=3;
1548                 if ((param_len > n) ||
1549                     (*p != NAMED_CURVE_TYPE) ||
1550                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1551                         {
1552                         al=SSL_AD_INTERNAL_ERROR;
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1554                         goto f_err;
1555                         }
1556
1557                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1558                 if (ngroup == NULL)
1559                         {
1560                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1561                         goto err;
1562                         }
1563                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1566                         goto err;
1567                         }
1568                 EC_GROUP_free(ngroup);
1569
1570                 group = EC_KEY_get0_group(ecdh);
1571
1572                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1573                     (EC_GROUP_get_degree(group) > 163))
1574                         {
1575                         al=SSL_AD_EXPORT_RESTRICTION;
1576                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1577                         goto f_err;
1578                         }
1579
1580                 p+=3;
1581
1582                 /* Next, get the encoded ECPoint */
1583                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1584                     ((bn_ctx = BN_CTX_new()) == NULL))
1585                         {
1586                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1587                         goto err;
1588                         }
1589
1590                 encoded_pt_len = *p;  /* length of encoded point */
1591                 p+=1;
1592                 param_len += (1 + encoded_pt_len);
1593                 if ((param_len > n) ||
1594                     (EC_POINT_oct2point(group, srvr_ecpoint,
1595                         p, encoded_pt_len, bn_ctx) == 0))
1596                         {
1597                         al=SSL_AD_DECODE_ERROR;
1598                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1599                         goto f_err;
1600                         }
1601
1602                 n-=param_len;
1603                 p+=encoded_pt_len;
1604
1605                 /* The ECC/TLS specification does not mention
1606                  * the use of DSA to sign ECParameters in the server
1607                  * key exchange message. We do support RSA and ECDSA.
1608                  */
1609                 if (0) ;
1610 #ifndef OPENSSL_NO_RSA
1611                 else if (alg_a & SSL_aRSA)
1612                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1613 #endif
1614 #ifndef OPENSSL_NO_ECDSA
1615                 else if (alg_a & SSL_aECDSA)
1616                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1617 #endif
1618                 /* else anonymous ECDH, so no certificate or pkey. */
1619                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1620                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1621                 ecdh=NULL;
1622                 BN_CTX_free(bn_ctx);
1623                 bn_ctx = NULL;
1624                 EC_POINT_free(srvr_ecpoint);
1625                 srvr_ecpoint = NULL;
1626                 }
1627         else if (alg_k)
1628                 {
1629                 al=SSL_AD_UNEXPECTED_MESSAGE;
1630                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1631                 goto f_err;
1632                 }
1633 #endif /* !OPENSSL_NO_ECDH */
1634
1635
1636         /* p points to the next byte, there are 'n' bytes left */
1637
1638         /* if it was signed, check the signature */
1639         if (pkey != NULL)
1640                 {
1641                 if (s->version >= TLS1_2_VERSION)
1642                         {
1643                         int sigalg = tls12_get_sigid(pkey);
1644                         /* Should never happen */
1645                         if (sigalg == -1)
1646                                 {
1647                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1648                                 goto err;
1649                                 }
1650                         /* Check key type is consistent with signature */
1651                         if (sigalg != (int)p[1])
1652                                 {
1653                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1654                                 al=SSL_AD_DECODE_ERROR;
1655                                 goto f_err;
1656                                 }
1657                         md = tls12_get_hash(p[0]);
1658                         if (md == NULL)
1659                                 {
1660                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1661                                 al=SSL_AD_DECODE_ERROR;
1662                                 goto f_err;
1663                                 }
1664 #ifdef SSL_DEBUG
1665 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1666 #endif
1667                         p += 2;
1668                         n -= 2;
1669                         }
1670                 else
1671                         md = EVP_sha1();
1672
1673                 n2s(p,i);
1674                 n-=2;
1675                 j=EVP_PKEY_size(pkey);
1676
1677                 if ((i != n) || (n > j) || (n <= 0))
1678                         {
1679                         /* wrong packet length */
1680                         al=SSL_AD_DECODE_ERROR;
1681                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1682                         goto f_err;
1683                         }
1684
1685 #ifndef OPENSSL_NO_RSA
1686                 if (pkey->type == EVP_PKEY_RSA && s->version < TLS1_2_VERSION)
1687                         {
1688                         int num;
1689
1690                         j=0;
1691                         q=md_buf;
1692                         for (num=2; num > 0; num--)
1693                                 {
1694                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1695                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1696                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1697                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1698                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1699                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1700                                 q+=i;
1701                                 j+=i;
1702                                 }
1703                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1704                                                                 pkey->pkey.rsa);
1705                         if (i < 0)
1706                                 {
1707                                 al=SSL_AD_DECRYPT_ERROR;
1708                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1709                                 goto f_err;
1710                                 }
1711                         if (i == 0)
1712                                 {
1713                                 /* bad signature */
1714                                 al=SSL_AD_DECRYPT_ERROR;
1715                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1716                                 goto f_err;
1717                                 }
1718                         }
1719                 else
1720 #endif
1721                         {
1722                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1723                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1724                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1725                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1726                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1727                                 {
1728                                 /* bad signature */
1729                                 al=SSL_AD_DECRYPT_ERROR;
1730                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1731                                 goto f_err;
1732                                 }
1733                         }
1734                 }
1735         else
1736                 {
1737                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1738                         /* aNULL or kPSK do not need public keys */
1739                         {
1740                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1741                         goto err;
1742                         }
1743                 /* still data left over */
1744                 if (n != 0)
1745                         {
1746                         al=SSL_AD_DECODE_ERROR;
1747                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1748                         goto f_err;
1749                         }
1750                 }
1751         EVP_PKEY_free(pkey);
1752         EVP_MD_CTX_cleanup(&md_ctx);
1753         return(1);
1754 f_err:
1755         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1756 err:
1757         EVP_PKEY_free(pkey);
1758 #ifndef OPENSSL_NO_RSA
1759         if (rsa != NULL)
1760                 RSA_free(rsa);
1761 #endif
1762 #ifndef OPENSSL_NO_DH
1763         if (dh != NULL)
1764                 DH_free(dh);
1765 #endif
1766 #ifndef OPENSSL_NO_ECDH
1767         BN_CTX_free(bn_ctx);
1768         EC_POINT_free(srvr_ecpoint);
1769         if (ecdh != NULL)
1770                 EC_KEY_free(ecdh);
1771 #endif
1772         EVP_MD_CTX_cleanup(&md_ctx);
1773         return(-1);
1774         }
1775
1776 int ssl3_get_certificate_request(SSL *s)
1777         {
1778         int ok,ret=0;
1779         unsigned long n,nc,l;
1780         unsigned int llen, ctype_num,i;
1781         X509_NAME *xn=NULL;
1782         const unsigned char *p,*q;
1783         unsigned char *d;
1784         STACK_OF(X509_NAME) *ca_sk=NULL;
1785
1786         n=s->method->ssl_get_message(s,
1787                 SSL3_ST_CR_CERT_REQ_A,
1788                 SSL3_ST_CR_CERT_REQ_B,
1789                 -1,
1790                 s->max_cert_list,
1791                 &ok);
1792
1793         if (!ok) return((int)n);
1794
1795         s->s3->tmp.cert_req=0;
1796
1797         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1798                 {
1799                 s->s3->tmp.reuse_message=1;
1800                 /* If we get here we don't need any cached handshake records
1801                  * as we wont be doing client auth.
1802                  */
1803                 if (s->s3->handshake_buffer)
1804                         {
1805                         if (!ssl3_digest_cached_records(s))
1806                                 goto err;
1807                         }
1808                 return(1);
1809                 }
1810
1811         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1812                 {
1813                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1814                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1815                 goto err;
1816                 }
1817
1818         /* TLS does not like anon-DH with client cert */
1819         if (s->version > SSL3_VERSION)
1820                 {
1821                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1822                         {
1823                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1824                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1825                         goto err;
1826                         }
1827                 }
1828
1829         p=d=(unsigned char *)s->init_msg;
1830
1831         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1832                 {
1833                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1834                 goto err;
1835                 }
1836
1837         /* get the certificate types */
1838         ctype_num= *(p++);
1839         if (ctype_num > SSL3_CT_NUMBER)
1840                 ctype_num=SSL3_CT_NUMBER;
1841         for (i=0; i<ctype_num; i++)
1842                 s->s3->tmp.ctype[i]= p[i];
1843         p+=ctype_num;
1844         /* HACK! For now just skip over signatature algorithms */
1845         if (s->version >= TLS1_2_VERSION)
1846                 {
1847                 n2s(p, llen);
1848                 /* Check we have enough room for signature algorithms and
1849                  * following length value.
1850                  */
1851                 if ((unsigned long)(p - d + llen + 2) > n)
1852                         {
1853                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1854                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1855                         goto err;
1856                         }
1857                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1858                         {
1859                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1860                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1861                         goto err;
1862                         }
1863                 p += llen;
1864                 }
1865
1866         /* get the CA RDNs */
1867         n2s(p,llen);
1868 #if 0
1869 {
1870 FILE *out;
1871 out=fopen("/tmp/vsign.der","w");
1872 fwrite(p,1,llen,out);
1873 fclose(out);
1874 }
1875 #endif
1876
1877         if ((unsigned long)(p - d + llen) != n)
1878                 {
1879                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1880                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1881                 goto err;
1882                 }
1883
1884         for (nc=0; nc<llen; )
1885                 {
1886                 n2s(p,l);
1887                 if ((l+nc+2) > llen)
1888                         {
1889                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1890                                 goto cont; /* netscape bugs */
1891                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1892                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1893                         goto err;
1894                         }
1895
1896                 q=p;
1897
1898                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1899                         {
1900                         /* If netscape tolerance is on, ignore errors */
1901                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1902                                 goto cont;
1903                         else
1904                                 {
1905                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1906                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1907                                 goto err;
1908                                 }
1909                         }
1910
1911                 if (q != (p+l))
1912                         {
1913                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1914                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1915                         goto err;
1916                         }
1917                 if (!sk_X509_NAME_push(ca_sk,xn))
1918                         {
1919                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1920                         goto err;
1921                         }
1922
1923                 p+=l;
1924                 nc+=l+2;
1925                 }
1926
1927         if (0)
1928                 {
1929 cont:
1930                 ERR_clear_error();
1931                 }
1932
1933         /* we should setup a certificate to return.... */
1934         s->s3->tmp.cert_req=1;
1935         s->s3->tmp.ctype_num=ctype_num;
1936         if (s->s3->tmp.ca_names != NULL)
1937                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1938         s->s3->tmp.ca_names=ca_sk;
1939         ca_sk=NULL;
1940
1941         ret=1;
1942 err:
1943         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1944         return(ret);
1945         }
1946
1947 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1948         {
1949         return(X509_NAME_cmp(*a,*b));
1950         }
1951 #ifndef OPENSSL_NO_TLSEXT
1952 int ssl3_get_new_session_ticket(SSL *s)
1953         {
1954         int ok,al,ret=0, ticklen;
1955         long n;
1956         const unsigned char *p;
1957         unsigned char *d;
1958
1959         n=s->method->ssl_get_message(s,
1960                 SSL3_ST_CR_SESSION_TICKET_A,
1961                 SSL3_ST_CR_SESSION_TICKET_B,
1962                 -1,
1963                 16384,
1964                 &ok);
1965
1966         if (!ok)
1967                 return((int)n);
1968
1969         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1970                 {
1971                 s->s3->tmp.reuse_message=1;
1972                 return(1);
1973                 }
1974         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1975                 {
1976                 al=SSL_AD_UNEXPECTED_MESSAGE;
1977                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1978                 goto f_err;
1979                 }
1980         if (n < 6)
1981                 {
1982                 /* need at least ticket_lifetime_hint + ticket length */
1983                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1984                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1985                 goto f_err;
1986                 }
1987
1988         p=d=(unsigned char *)s->init_msg;
1989         n2l(p, s->session->tlsext_tick_lifetime_hint);
1990         n2s(p, ticklen);
1991         /* ticket_lifetime_hint + ticket_length + ticket */
1992         if (ticklen + 6 != n)
1993                 {
1994                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1995                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1996                 goto f_err;
1997                 }
1998         if (s->session->tlsext_tick)
1999                 {
2000                 OPENSSL_free(s->session->tlsext_tick);
2001                 s->session->tlsext_ticklen = 0;
2002                 }
2003         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2004         if (!s->session->tlsext_tick)
2005                 {
2006                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2007                 goto err;
2008                 }
2009         memcpy(s->session->tlsext_tick, p, ticklen);
2010         s->session->tlsext_ticklen = ticklen;
2011         /* There are two ways to detect a resumed ticket sesion.
2012          * One is to set an appropriate session ID and then the server
2013          * must return a match in ServerHello. This allows the normal
2014          * client session ID matching to work and we know much
2015          * earlier that the ticket has been accepted.
2016          *
2017          * The other way is to set zero length session ID when the
2018          * ticket is presented and rely on the handshake to determine
2019          * session resumption.
2020          *
2021          * We choose the former approach because this fits in with
2022          * assumptions elsewhere in OpenSSL. The session ID is set
2023          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2024          * ticket.
2025          */
2026         EVP_Digest(p, ticklen,
2027                         s->session->session_id, &s->session->session_id_length,
2028 #ifndef OPENSSL_NO_SHA256
2029                                                         EVP_sha256(), NULL);
2030 #else
2031                                                         EVP_sha1(), NULL);
2032 #endif
2033         ret=1;
2034         return(ret);
2035 f_err:
2036         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2037 err:
2038         return(-1);
2039         }
2040
2041 int ssl3_get_cert_status(SSL *s)
2042         {
2043         int ok, al;
2044         unsigned long resplen,n;
2045         const unsigned char *p;
2046
2047         n=s->method->ssl_get_message(s,
2048                 SSL3_ST_CR_CERT_STATUS_A,
2049                 SSL3_ST_CR_CERT_STATUS_B,
2050                 SSL3_MT_CERTIFICATE_STATUS,
2051                 16384,
2052                 &ok);
2053
2054         if (!ok) return((int)n);
2055         if (n < 4)
2056                 {
2057                 /* need at least status type + length */
2058                 al = SSL_AD_DECODE_ERROR;
2059                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2060                 goto f_err;
2061                 }
2062         p = (unsigned char *)s->init_msg;
2063         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2064                 {
2065                 al = SSL_AD_DECODE_ERROR;
2066                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2067                 goto f_err;
2068                 }
2069         n2l3(p, resplen);
2070         if (resplen + 4 != n)
2071                 {
2072                 al = SSL_AD_DECODE_ERROR;
2073                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2074                 goto f_err;
2075                 }
2076         if (s->tlsext_ocsp_resp)
2077                 OPENSSL_free(s->tlsext_ocsp_resp);
2078         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2079         if (!s->tlsext_ocsp_resp)
2080                 {
2081                 al = SSL_AD_INTERNAL_ERROR;
2082                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2083                 goto f_err;
2084                 }
2085         s->tlsext_ocsp_resplen = resplen;
2086         if (s->ctx->tlsext_status_cb)
2087                 {
2088                 int ret;
2089                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2090                 if (ret == 0)
2091                         {
2092                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2093                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2094                         goto f_err;
2095                         }
2096                 if (ret < 0)
2097                         {
2098                         al = SSL_AD_INTERNAL_ERROR;
2099                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2100                         goto f_err;
2101                         }
2102                 }
2103         return 1;
2104 f_err:
2105         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2106         return(-1);
2107         }
2108 #endif
2109
2110 int ssl3_get_server_done(SSL *s)
2111         {
2112         int ok,ret=0;
2113         long n;
2114
2115         n=s->method->ssl_get_message(s,
2116                 SSL3_ST_CR_SRVR_DONE_A,
2117                 SSL3_ST_CR_SRVR_DONE_B,
2118                 SSL3_MT_SERVER_DONE,
2119                 30, /* should be very small, like 0 :-) */
2120                 &ok);
2121
2122         if (!ok) return((int)n);
2123         if (n > 0)
2124                 {
2125                 /* should contain no data */
2126                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2127                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2128                 return -1;
2129                 }
2130         ret=1;
2131         return(ret);
2132         }
2133
2134
2135 int ssl3_send_client_key_exchange(SSL *s)
2136         {
2137         unsigned char *p,*d;
2138         int n;
2139         unsigned long alg_k;
2140 #ifndef OPENSSL_NO_RSA
2141         unsigned char *q;
2142         EVP_PKEY *pkey=NULL;
2143 #endif
2144 #ifndef OPENSSL_NO_KRB5
2145         KSSL_ERR kssl_err;
2146 #endif /* OPENSSL_NO_KRB5 */
2147 #ifndef OPENSSL_NO_ECDH
2148         EC_KEY *clnt_ecdh = NULL;
2149         const EC_POINT *srvr_ecpoint = NULL;
2150         EVP_PKEY *srvr_pub_pkey = NULL;
2151         unsigned char *encodedPoint = NULL;
2152         int encoded_pt_len = 0;
2153         BN_CTX * bn_ctx = NULL;
2154 #endif
2155
2156         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2157                 {
2158                 d=(unsigned char *)s->init_buf->data;
2159                 p= &(d[4]);
2160
2161                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2162
2163                 /* Fool emacs indentation */
2164                 if (0) {}
2165 #ifndef OPENSSL_NO_RSA
2166                 else if (alg_k & SSL_kRSA)
2167                         {
2168                         RSA *rsa;
2169                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2170
2171                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2172                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2173                         else
2174                                 {
2175                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2176                                 if ((pkey == NULL) ||
2177                                         (pkey->type != EVP_PKEY_RSA) ||
2178                                         (pkey->pkey.rsa == NULL))
2179                                         {
2180                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2181                                         goto err;
2182                                         }
2183                                 rsa=pkey->pkey.rsa;
2184                                 EVP_PKEY_free(pkey);
2185                                 }
2186
2187                         tmp_buf[0]=s->client_version>>8;
2188                         tmp_buf[1]=s->client_version&0xff;
2189                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2190                                         goto err;
2191
2192                         s->session->master_key_length=sizeof tmp_buf;
2193
2194                         q=p;
2195                         /* Fix buf for TLS and beyond */
2196                         if (s->version > SSL3_VERSION)
2197                                 p+=2;
2198                         n=RSA_public_encrypt(sizeof tmp_buf,
2199                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2200 #ifdef PKCS1_CHECK
2201                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2202                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2203 #endif
2204                         if (n <= 0)
2205                                 {
2206                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2207                                 goto err;
2208                                 }
2209
2210                         /* Fix buf for TLS and beyond */
2211                         if (s->version > SSL3_VERSION)
2212                                 {
2213                                 s2n(n,q);
2214                                 n+=2;
2215                                 }
2216
2217                         s->session->master_key_length=
2218                                 s->method->ssl3_enc->generate_master_secret(s,
2219                                         s->session->master_key,
2220                                         tmp_buf,sizeof tmp_buf);
2221                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2222                         }
2223 #endif
2224 #ifndef OPENSSL_NO_KRB5
2225                 else if (alg_k & SSL_kKRB5)
2226                         {
2227                         krb5_error_code krb5rc;
2228                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2229                         /*  krb5_data   krb5_ap_req;  */
2230                         krb5_data       *enc_ticket;
2231                         krb5_data       authenticator, *authp = NULL;
2232                         EVP_CIPHER_CTX  ciph_ctx;
2233                         const EVP_CIPHER *enc = NULL;
2234                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2235                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2236                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2237                                                 + EVP_MAX_IV_LENGTH];
2238                         int             padl, outl = sizeof(epms);
2239
2240                         EVP_CIPHER_CTX_init(&ciph_ctx);
2241
2242 #ifdef KSSL_DEBUG
2243                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2244                                 alg_k, SSL_kKRB5);
2245 #endif  /* KSSL_DEBUG */
2246
2247                         authp = NULL;
2248 #ifdef KRB5SENDAUTH
2249                         if (KRB5SENDAUTH)  authp = &authenticator;
2250 #endif  /* KRB5SENDAUTH */
2251
2252                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2253                                 &kssl_err);
2254                         enc = kssl_map_enc(kssl_ctx->enctype);
2255                         if (enc == NULL)
2256                             goto err;
2257 #ifdef KSSL_DEBUG
2258                         {
2259                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2260                         if (krb5rc && kssl_err.text)
2261                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2262                         }
2263 #endif  /* KSSL_DEBUG */
2264
2265                         if (krb5rc)
2266                                 {
2267                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2268                                                 SSL_AD_HANDSHAKE_FAILURE);
2269                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2270                                                 kssl_err.reason);
2271                                 goto err;
2272                                 }
2273
2274                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2275                         **  in place of RFC 2712 KerberosWrapper, as in:
2276                         **
2277                         **  Send ticket (copy to *p, set n = length)
2278                         **  n = krb5_ap_req.length;
2279                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2280                         **  if (krb5_ap_req.data)
2281                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2282                         **
2283                         **  Now using real RFC 2712 KerberosWrapper
2284                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2285                         **  Note: 2712 "opaque" types are here replaced
2286                         **  with a 2-byte length followed by the value.
2287                         **  Example:
2288                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2289                         **  Where "xx xx" = length bytes.  Shown here with
2290                         **  optional authenticator omitted.
2291                         */
2292
2293                         /*  KerberosWrapper.Ticket              */
2294                         s2n(enc_ticket->length,p);
2295                         memcpy(p, enc_ticket->data, enc_ticket->length);
2296                         p+= enc_ticket->length;
2297                         n = enc_ticket->length + 2;
2298
2299                         /*  KerberosWrapper.Authenticator       */
2300                         if (authp  &&  authp->length)
2301                                 {
2302                                 s2n(authp->length,p);
2303                                 memcpy(p, authp->data, authp->length);
2304                                 p+= authp->length;
2305                                 n+= authp->length + 2;
2306
2307                                 free(authp->data);
2308                                 authp->data = NULL;
2309                                 authp->length = 0;
2310                                 }
2311                         else
2312                                 {
2313                                 s2n(0,p);/*  null authenticator length  */
2314                                 n+=2;
2315                                 }
2316
2317                             tmp_buf[0]=s->client_version>>8;
2318                             tmp_buf[1]=s->client_version&0xff;
2319                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2320                                 goto err;
2321
2322                         /*  20010420 VRS.  Tried it this way; failed.
2323                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2324                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2325                         **                              kssl_ctx->length);
2326                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2327                         */
2328
2329                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2330                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2331                                 kssl_ctx->key,iv);
2332                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2333                                 sizeof tmp_buf);
2334                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2335                         outl += padl;
2336                         if (outl > (int)sizeof epms)
2337                                 {
2338                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2339                                 goto err;
2340                                 }
2341                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2342
2343                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2344                         s2n(outl,p);
2345                         memcpy(p, epms, outl);
2346                         p+=outl;
2347                         n+=outl + 2;
2348
2349                         s->session->master_key_length=
2350                                 s->method->ssl3_enc->generate_master_secret(s,
2351                                         s->session->master_key,
2352                                         tmp_buf, sizeof tmp_buf);
2353
2354                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2355                         OPENSSL_cleanse(epms, outl);
2356                         }
2357 #endif
2358 #ifndef OPENSSL_NO_DH
2359                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2360                         {
2361                         DH *dh_srvr,*dh_clnt;
2362
2363                         if (s->session->sess_cert == NULL)
2364                                 {
2365                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2366                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2367                                 goto err;
2368                                 }
2369
2370                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2371                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2372                         else
2373                                 {
2374                                 /* we get them from the cert */
2375                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2376                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2377                                 goto err;
2378                                 }
2379
2380                         /* generate a new random key */
2381                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2382                                 {
2383                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2384                                 goto err;
2385                                 }
2386                         if (!DH_generate_key(dh_clnt))
2387                                 {
2388                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2389                                 goto err;
2390                                 }
2391
2392                         /* use the 'p' output buffer for the DH key, but
2393                          * make sure to clear it out afterwards */
2394
2395                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2396
2397                         if (n <= 0)
2398                                 {
2399                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2400                                 goto err;
2401                                 }
2402
2403                         /* generate master key from the result */
2404                         s->session->master_key_length=
2405                                 s->method->ssl3_enc->generate_master_secret(s,
2406                                         s->session->master_key,p,n);
2407                         /* clean up */
2408                         memset(p,0,n);
2409
2410                         /* send off the data */
2411                         n=BN_num_bytes(dh_clnt->pub_key);
2412                         s2n(n,p);
2413                         BN_bn2bin(dh_clnt->pub_key,p);
2414                         n+=2;
2415
2416                         DH_free(dh_clnt);
2417
2418                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2419                         }
2420 #endif
2421
2422 #ifndef OPENSSL_NO_ECDH
2423                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2424                         {
2425                         const EC_GROUP *srvr_group = NULL;
2426                         EC_KEY *tkey;
2427                         int ecdh_clnt_cert = 0;
2428                         int field_size = 0;
2429
2430                         /* Did we send out the client's
2431                          * ECDH share for use in premaster
2432                          * computation as part of client certificate?
2433                          * If so, set ecdh_clnt_cert to 1.
2434                          */
2435                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2436                                 {
2437                                 /* XXX: For now, we do not support client
2438                                  * authentication using ECDH certificates.
2439                                  * To add such support, one needs to add
2440                                  * code that checks for appropriate
2441                                  * conditions and sets ecdh_clnt_cert to 1.
2442                                  * For example, the cert have an ECC
2443                                  * key on the same curve as the server's
2444                                  * and the key should be authorized for
2445                                  * key agreement.
2446                                  *
2447                                  * One also needs to add code in ssl3_connect
2448                                  * to skip sending the certificate verify
2449                                  * message.
2450                                  *
2451                                  * if ((s->cert->key->privatekey != NULL) &&
2452                                  *     (s->cert->key->privatekey->type ==
2453                                  *      EVP_PKEY_EC) && ...)
2454                                  * ecdh_clnt_cert = 1;
2455                                  */
2456                                 }
2457
2458                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2459                                 {
2460                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2461                                 }
2462                         else
2463                                 {
2464                                 /* Get the Server Public Key from Cert */
2465                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2466                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2467                                 if ((srvr_pub_pkey == NULL) ||
2468                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2469                                     (srvr_pub_pkey->pkey.ec == NULL))
2470                                         {
2471                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2472                                             ERR_R_INTERNAL_ERROR);
2473                                         goto err;
2474                                         }
2475
2476                                 tkey = srvr_pub_pkey->pkey.ec;
2477                                 }
2478
2479                         srvr_group   = EC_KEY_get0_group(tkey);
2480                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2481
2482                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2483                                 {
2484                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2485                                     ERR_R_INTERNAL_ERROR);
2486                                 goto err;
2487                                 }
2488
2489                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2490                                 {
2491                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2492                                 goto err;
2493                                 }
2494
2495                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2496                                 {
2497                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2498                                 goto err;
2499                                 }
2500                         if (ecdh_clnt_cert)
2501                                 {
2502                                 /* Reuse key info from our certificate
2503                                  * We only need our private key to perform
2504                                  * the ECDH computation.
2505                                  */
2506                                 const BIGNUM *priv_key;
2507                                 tkey = s->cert->key->privatekey->pkey.ec;
2508                                 priv_key = EC_KEY_get0_private_key(tkey);
2509                                 if (priv_key == NULL)
2510                                         {
2511                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2512                                         goto err;
2513                                         }
2514                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2515                                         {
2516                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2517                                         goto err;
2518                                         }
2519                                 }
2520                         else
2521                                 {
2522                                 /* Generate a new ECDH key pair */
2523                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2524                                         {
2525                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2526                                         goto err;
2527                                         }
2528                                 }
2529
2530                         /* use the 'p' output buffer for the ECDH key, but
2531                          * make sure to clear it out afterwards
2532                          */
2533
2534                         field_size = EC_GROUP_get_degree(srvr_group);
2535                         if (field_size <= 0)
2536                                 {
2537                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2538                                        ERR_R_ECDH_LIB);
2539                                 goto err;
2540                                 }
2541                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2542                         if (n <= 0)
2543                                 {
2544                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2545                                        ERR_R_ECDH_LIB);
2546                                 goto err;
2547                                 }
2548
2549                         /* generate master key from the result */
2550                         s->session->master_key_length = s->method->ssl3_enc \
2551                             -> generate_master_secret(s,
2552                                 s->session->master_key,
2553                                 p, n);
2554
2555                         memset(p, 0, n); /* clean up */
2556
2557                         if (ecdh_clnt_cert)
2558                                 {
2559                                 /* Send empty client key exch message */
2560                                 n = 0;
2561                                 }
2562                         else
2563                                 {
2564                                 /* First check the size of encoding and
2565                                  * allocate memory accordingly.
2566                                  */
2567                                 encoded_pt_len =
2568                                     EC_POINT_point2oct(srvr_group,
2569                                         EC_KEY_get0_public_key(clnt_ecdh),
2570                                         POINT_CONVERSION_UNCOMPRESSED,
2571                                         NULL, 0, NULL);
2572
2573                                 encodedPoint = (unsigned char *)
2574                                     OPENSSL_malloc(encoded_pt_len *
2575                                         sizeof(unsigned char));
2576                                 bn_ctx = BN_CTX_new();
2577                                 if ((encodedPoint == NULL) ||
2578                                     (bn_ctx == NULL))
2579                                         {
2580                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2581                                         goto err;
2582                                         }
2583
2584                                 /* Encode the public key */
2585                                 n = EC_POINT_point2oct(srvr_group,
2586                                     EC_KEY_get0_public_key(clnt_ecdh),
2587                                     POINT_CONVERSION_UNCOMPRESSED,
2588                                     encodedPoint, encoded_pt_len, bn_ctx);
2589
2590                                 *p = n; /* length of encoded point */
2591                                 /* Encoded point will be copied here */
2592                                 p += 1;
2593                                 /* copy the point */
2594                                 memcpy((unsigned char *)p, encodedPoint, n);
2595                                 /* increment n to account for length field */
2596                                 n += 1;
2597                                 }
2598
2599                         /* Free allocated memory */
2600                         BN_CTX_free(bn_ctx);
2601                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2602                         if (clnt_ecdh != NULL)
2603                                  EC_KEY_free(clnt_ecdh);
2604                         EVP_PKEY_free(srvr_pub_pkey);
2605                         }
2606 #endif /* !OPENSSL_NO_ECDH */
2607                 else if (alg_k & SSL_kGOST)
2608                         {
2609                         /* GOST key exchange message creation */
2610                         EVP_PKEY_CTX *pkey_ctx;
2611                         X509 *peer_cert;
2612                         size_t msglen;
2613                         unsigned int md_len;
2614                         int keytype;
2615                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2616                         EVP_MD_CTX *ukm_hash;
2617                         EVP_PKEY *pub_key;
2618
2619                         /* Get server sertificate PKEY and create ctx from it */
2620                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2621                         if (!peer_cert)
2622                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2623                         if (!peer_cert)         {
2624                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2625                                         goto err;
2626                                 }
2627
2628                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2629                         /* If we have send a certificate, and certificate key
2630
2631                          * parameters match those of server certificate, use
2632                          * certificate key for key exchange
2633                          */
2634
2635                          /* Otherwise, generate ephemeral key pair */
2636
2637                         EVP_PKEY_encrypt_init(pkey_ctx);
2638                           /* Generate session key */
2639                     RAND_bytes(premaster_secret,32);
2640                         /* If we have client certificate, use its secret as peer key */
2641                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2642                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2643                                         /* If there was an error - just ignore it. Ephemeral key
2644                                         * would be used
2645                                         */
2646                                         ERR_clear_error();
2647                                 }
2648                         }
2649                         /* Compute shared IV and store it in algorithm-specific
2650                          * context data */
2651                         ukm_hash = EVP_MD_CTX_create();
2652                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2653                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2654                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2655                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2656                         EVP_MD_CTX_destroy(ukm_hash);
2657                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2658                                 8,shared_ukm)<0) {
2659                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2660                                                 SSL_R_LIBRARY_BUG);
2661                                         goto err;
2662                                 }
2663                         /* Make GOST keytransport blob message */
2664                         /*Encapsulate it into sequence */
2665                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2666                         msglen=255;
2667                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2668                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2669                                         SSL_R_LIBRARY_BUG);
2670                                 goto err;
2671                         }
2672                         if (msglen >= 0x80)
2673                                 {
2674                                 *(p++)=0x81;
2675                                 *(p++)= msglen & 0xff;
2676                                 n=msglen+3;
2677                                 }
2678                         else
2679                                 {
2680                                 *(p++)= msglen & 0xff;
2681                                 n=msglen+2;
2682                                 }
2683                         memcpy(p, tmp, msglen);
2684                         /* Check if pubkey from client certificate was used */
2685                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2686                                 {
2687                                 /* Set flag "skip certificate verify" */
2688                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2689                                 }
2690                         EVP_PKEY_CTX_free(pkey_ctx);
2691                         s->session->master_key_length=
2692                                 s->method->ssl3_enc->generate_master_secret(s,
2693                                         s->session->master_key,premaster_secret,32);
2694                         EVP_PKEY_free(pub_key);
2695
2696                         }
2697 #ifndef OPENSSL_NO_SRP
2698                 else if (alg_k & SSL_kSRP)
2699                         {
2700                         if (s->srp_ctx.A != NULL)
2701                                 {
2702                                 /* send off the data */
2703                                 n=BN_num_bytes(s->srp_ctx.A);
2704                                 s2n(n,p);
2705                                 BN_bn2bin(s->srp_ctx.A,p);
2706                                 n+=2;
2707                                 }
2708                         else
2709                                 {
2710                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2711                                 goto err;
2712                                 }
2713                         if (s->session->srp_username != NULL)
2714                                 OPENSSL_free(s->session->srp_username);
2715                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2716                         if (s->session->srp_username == NULL)
2717                                 {
2718                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2719                                         ERR_R_MALLOC_FAILURE);
2720                                 goto err;
2721                                 }
2722
2723                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2724                                 {
2725                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2726                                 goto err;
2727                                 }
2728                         }
2729 #endif
2730 #ifndef OPENSSL_NO_PSK
2731                 else if (alg_k & SSL_kPSK)
2732                         {
2733                         char identity[PSK_MAX_IDENTITY_LEN];
2734                         unsigned char *t = NULL;
2735                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2736                         unsigned int pre_ms_len = 0, psk_len = 0;
2737                         int psk_err = 1;
2738
2739                         n = 0;
2740                         if (s->psk_client_callback == NULL)
2741                                 {
2742                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2743                                         SSL_R_PSK_NO_CLIENT_CB);
2744                                 goto err;
2745                                 }
2746
2747                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2748                                 identity, PSK_MAX_IDENTITY_LEN,
2749                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2750                         if (psk_len > PSK_MAX_PSK_LEN)
2751                                 {
2752                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2753                                         ERR_R_INTERNAL_ERROR);
2754                                 goto psk_err;
2755                                 }
2756                         else if (psk_len == 0)
2757                                 {
2758                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2759                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2760                                 goto psk_err;
2761                                 }
2762
2763                         /* create PSK pre_master_secret */
2764                         pre_ms_len = 2+psk_len+2+psk_len;
2765                         t = psk_or_pre_ms;
2766                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2767                         s2n(psk_len, t);
2768                         memset(t, 0, psk_len);
2769                         t+=psk_len;
2770                         s2n(psk_len, t);
2771
2772                         if (s->session->psk_identity_hint != NULL)
2773                                 OPENSSL_free(s->session->psk_identity_hint);
2774                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2775                         if (s->ctx->psk_identity_hint != NULL &&
2776                                 s->session->psk_identity_hint == NULL)
2777                                 {
2778                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2779                                         ERR_R_MALLOC_FAILURE);
2780                                 goto psk_err;
2781                                 }
2782
2783                         if (s->session->psk_identity != NULL)
2784                                 OPENSSL_free(s->session->psk_identity);
2785                         s->session->psk_identity = BUF_strdup(identity);
2786                         if (s->session->psk_identity == NULL)
2787                                 {
2788                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2789                                         ERR_R_MALLOC_FAILURE);
2790                                 goto psk_err;
2791                                 }
2792
2793                         s->session->master_key_length =
2794                                 s->method->ssl3_enc->generate_master_secret(s,
2795                                         s->session->master_key,
2796                                         psk_or_pre_ms, pre_ms_len);
2797                         n = strlen(identity);
2798                         s2n(n, p);
2799                         memcpy(p, identity, n);
2800                         n+=2;
2801                         psk_err = 0;
2802                 psk_err:
2803                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2804                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2805                         if (psk_err != 0)
2806                                 {
2807                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2808                                 goto err;
2809                                 }
2810                         }
2811 #endif
2812                 else
2813                         {
2814                         ssl3_send_alert(s, SSL3_AL_FATAL,
2815                             SSL_AD_HANDSHAKE_FAILURE);
2816                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2817                             ERR_R_INTERNAL_ERROR);
2818                         goto err;
2819                         }
2820
2821                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2822                 l2n3(n,d);
2823
2824                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2825                 /* number of bytes to write */
2826                 s->init_num=n+4;
2827                 s->init_off=0;
2828                 }
2829
2830         /* SSL3_ST_CW_KEY_EXCH_B */
2831         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2832 err:
2833 #ifndef OPENSSL_NO_ECDH
2834         BN_CTX_free(bn_ctx);
2835         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2836         if (clnt_ecdh != NULL)
2837                 EC_KEY_free(clnt_ecdh);
2838         EVP_PKEY_free(srvr_pub_pkey);
2839 #endif
2840         return(-1);
2841         }
2842
2843 int ssl3_send_client_verify(SSL *s)
2844         {
2845         unsigned char *p,*d;
2846         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2847         EVP_PKEY *pkey;
2848         EVP_PKEY_CTX *pctx=NULL;
2849         EVP_MD_CTX mctx;
2850         unsigned u=0;
2851         unsigned long n;
2852         int j;
2853
2854         EVP_MD_CTX_init(&mctx);
2855
2856         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2857                 {
2858                 d=(unsigned char *)s->init_buf->data;
2859                 p= &(d[4]);
2860                 pkey=s->cert->key->privatekey;
2861 /* Create context from key and test if sha1 is allowed as digest */
2862                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2863                 EVP_PKEY_sign_init(pctx);
2864                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2865                         {
2866                         if (s->version < TLS1_2_VERSION)
2867                                 s->method->ssl3_enc->cert_verify_mac(s,
2868                                                 NID_sha1,
2869                                                 &(data[MD5_DIGEST_LENGTH]));
2870                         }
2871                 else
2872                         {
2873                         ERR_clear_error();
2874                         }
2875                 /* For TLS v1.2 send signature algorithm and signature
2876                  * using agreed digest and cached handshake records.
2877                  */
2878                 if (s->version >= TLS1_2_VERSION)
2879                         {
2880                         long hdatalen = 0;
2881                         void *hdata;
2882                         const EVP_MD *md = s->cert->key->digest;
2883                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2884                                                                 &hdata);
2885                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2886                                 {
2887                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2888                                                 ERR_R_INTERNAL_ERROR);
2889                                 goto err;
2890                                 }
2891                         p += 2;
2892 #ifdef SSL_DEBUG
2893                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2894                                                         EVP_MD_name(md));
2895 #endif
2896                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2897                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2898                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2899                                 {
2900                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2901                                                 ERR_R_EVP_LIB);
2902                                 goto err;
2903                                 }
2904                         s2n(u,p);
2905                         n = u + 4;
2906                         if (!ssl3_digest_cached_records(s))
2907                                 goto err;
2908                         }
2909                 else
2910 #ifndef OPENSSL_NO_RSA
2911                 if (pkey->type == EVP_PKEY_RSA)
2912                         {
2913                         s->method->ssl3_enc->cert_verify_mac(s,
2914                                 NID_md5,
2915                                 &(data[0]));
2916                         if (RSA_sign(NID_md5_sha1, data,
2917                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2918                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2919                                 {
2920                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2921                                 goto err;
2922                                 }
2923                         s2n(u,p);
2924                         n=u+2;
2925                         }
2926                 else
2927 #endif
2928 #ifndef OPENSSL_NO_DSA
2929                         if (pkey->type == EVP_PKEY_DSA)
2930                         {
2931                         if (!DSA_sign(pkey->save_type,
2932                                 &(data[MD5_DIGEST_LENGTH]),
2933                                 SHA_DIGEST_LENGTH,&(p[2]),
2934                                 (unsigned int *)&j,pkey->pkey.dsa))
2935                                 {
2936                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2937                                 goto err;
2938                                 }
2939                         s2n(j,p);
2940                         n=j+2;
2941                         }
2942                 else
2943 #endif
2944 #ifndef OPENSSL_NO_ECDSA
2945                         if (pkey->type == EVP_PKEY_EC)
2946                         {
2947                         if (!ECDSA_sign(pkey->save_type,
2948                                 &(data[MD5_DIGEST_LENGTH]),
2949                                 SHA_DIGEST_LENGTH,&(p[2]),
2950                                 (unsigned int *)&j,pkey->pkey.ec))
2951                                 {
2952                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2953                                     ERR_R_ECDSA_LIB);
2954                                 goto err;
2955                                 }
2956                         s2n(j,p);
2957                         n=j+2;
2958                         }
2959                 else
2960 #endif
2961                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2962                 {
2963                 unsigned char signbuf[64];
2964                 int i;
2965                 size_t sigsize=64;
2966                 s->method->ssl3_enc->cert_verify_mac(s,
2967                         NID_id_GostR3411_94,
2968                         data);
2969                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2970                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2971                         ERR_R_INTERNAL_ERROR);
2972                         goto err;
2973                 }
2974                 for (i=63,j=0; i>=0; j++, i--) {
2975                         p[2+j]=signbuf[i];
2976                 }
2977                 s2n(j,p);
2978                 n=j+2;
2979                 }
2980                 else
2981                 {
2982                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2983                         goto err;
2984                 }
2985                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2986                 l2n3(n,d);
2987
2988                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2989                 s->init_num=(int)n+4;
2990                 s->init_off=0;
2991                 }
2992         EVP_MD_CTX_cleanup(&mctx);
2993         EVP_PKEY_CTX_free(pctx);
2994         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2995 err:
2996         EVP_MD_CTX_cleanup(&mctx);
2997         EVP_PKEY_CTX_free(pctx);
2998         return(-1);
2999         }
3000
3001 int ssl3_send_client_certificate(SSL *s)
3002         {
3003         X509 *x509=NULL;
3004         EVP_PKEY *pkey=NULL;
3005         int i;
3006         unsigned long l;
3007
3008         if (s->state == SSL3_ST_CW_CERT_A)
3009                 {
3010                 if ((s->cert == NULL) ||
3011                         (s->cert->key->x509 == NULL) ||
3012                         (s->cert->key->privatekey == NULL))
3013                         s->state=SSL3_ST_CW_CERT_B;
3014                 else
3015                         s->state=SSL3_ST_CW_CERT_C;
3016                 }
3017
3018         /* We need to get a client cert */
3019         if (s->state == SSL3_ST_CW_CERT_B)
3020                 {
3021                 /* If we get an error, we need to
3022                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3023                  * We then get retied later */
3024                 i=0;
3025                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3026                 if (i < 0)
3027                         {
3028                         s->rwstate=SSL_X509_LOOKUP;
3029                         return(-1);
3030                         }
3031                 s->rwstate=SSL_NOTHING;
3032                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3033                         {
3034                         s->state=SSL3_ST_CW_CERT_B;
3035                         if (    !SSL_use_certificate(s,x509) ||
3036                                 !SSL_use_PrivateKey(s,pkey))
3037                                 i=0;
3038                         }
3039                 else if (i == 1)
3040                         {
3041                         i=0;
3042                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3043                         }
3044
3045                 if (x509 != NULL) X509_free(x509);
3046                 if (pkey != NULL) EVP_PKEY_free(pkey);
3047                 if (i == 0)
3048                         {
3049                         if (s->version == SSL3_VERSION)
3050                                 {
3051                                 s->s3->tmp.cert_req=0;
3052                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3053                                 return(1);
3054                                 }
3055                         else
3056                                 {
3057                                 s->s3->tmp.cert_req=2;
3058                                 }
3059                         }
3060
3061                 /* Ok, we have a cert */
3062                 s->state=SSL3_ST_CW_CERT_C;
3063                 }
3064
3065         if (s->state == SSL3_ST_CW_CERT_C)
3066                 {
3067                 s->state=SSL3_ST_CW_CERT_D;
3068                 l=ssl3_output_cert_chain(s,
3069                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3070                 s->init_num=(int)l;
3071                 s->init_off=0;
3072                 }
3073         /* SSL3_ST_CW_CERT_D */
3074         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3075         }
3076
3077 #define has_bits(i,m)   (((i)&(m)) == (m))
3078
3079 int ssl3_check_cert_and_algorithm(SSL *s)
3080         {
3081         int i,idx;
3082         long alg_k,alg_a;
3083         EVP_PKEY *pkey=NULL;
3084         SESS_CERT *sc;
3085 #ifndef OPENSSL_NO_RSA
3086         RSA *rsa;
3087 #endif
3088 #ifndef OPENSSL_NO_DH
3089         DH *dh;
3090 #endif
3091
3092         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3093         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3094
3095         /* we don't have a certificate */
3096         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3097                 return(1);
3098
3099         sc=s->session->sess_cert;
3100         if (sc == NULL)
3101                 {
3102                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3103                 goto err;
3104                 }
3105
3106 #ifndef OPENSSL_NO_RSA
3107         rsa=s->session->sess_cert->peer_rsa_tmp;
3108 #endif
3109 #ifndef OPENSSL_NO_DH
3110         dh=s->session->sess_cert->peer_dh_tmp;
3111 #endif
3112
3113         /* This is the passed certificate */
3114
3115         idx=sc->peer_cert_type;
3116 #ifndef OPENSSL_NO_ECDH
3117         if (idx == SSL_PKEY_ECC)
3118                 {
3119                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3120                                                                 s) == 0)
3121                         { /* check failed */
3122                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3123                         goto f_err;
3124                         }
3125                 else
3126                         {
3127                         return 1;
3128                         }
3129                 }
3130 #endif
3131         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3132         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3133         EVP_PKEY_free(pkey);
3134
3135
3136         /* Check that we have a certificate if we require one */
3137         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3138                 {
3139                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3140                 goto f_err;
3141                 }
3142 #ifndef OPENSSL_NO_DSA
3143         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3144                 {
3145                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3146                 goto f_err;
3147                 }
3148 #endif
3149 #ifndef OPENSSL_NO_RSA
3150         if ((alg_k & SSL_kRSA) &&
3151                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3152                 {
3153                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3154                 goto f_err;
3155                 }
3156 #endif
3157 #ifndef OPENSSL_NO_DH
3158         if ((alg_k & SSL_kEDH) &&
3159                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3160                 {
3161                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3162                 goto f_err;
3163                 }
3164         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3165                 {
3166                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3167                 goto f_err;
3168                 }
3169 #ifndef OPENSSL_NO_DSA
3170         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3171                 {
3172                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3173                 goto f_err;
3174                 }
3175 #endif
3176 #endif
3177
3178         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3179                 {
3180 #ifndef OPENSSL_NO_RSA
3181                 if (alg_k & SSL_kRSA)
3182                         {
3183                         if (rsa == NULL
3184                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3185                                 {
3186                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3187                                 goto f_err;
3188                                 }
3189                         }
3190                 else
3191 #endif
3192 #ifndef OPENSSL_NO_DH
3193                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3194                             {
3195                             if (dh == NULL
3196                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3197                                 {
3198                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3199                                 goto f_err;
3200                                 }
3201                         }
3202                 else
3203 #endif
3204                         {
3205                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3206                         goto f_err;
3207                         }
3208                 }
3209         return(1);
3210 f_err:
3211         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3212 err:
3213         return(0);
3214         }
3215
3216 /* Check to see if handshake is full or resumed. Usually this is just a
3217  * case of checking to see if a cache hit has occurred. In the case of
3218  * session tickets we have to check the next message to be sure.
3219  */
3220
3221 #ifndef OPENSSL_NO_TLSEXT
3222 int ssl3_check_finished(SSL *s)
3223         {
3224         int ok;
3225         long n;
3226         /* If we have no ticket it cannot be a resumed session. */
3227         if (!s->session->tlsext_tick)
3228                 return 1;
3229         /* this function is called when we really expect a Certificate
3230          * message, so permit appropriate message length */
3231         n=s->method->ssl_get_message(s,
3232                 SSL3_ST_CR_CERT_A,
3233                 SSL3_ST_CR_CERT_B,
3234                 -1,
3235                 s->max_cert_list,
3236                 &ok);
3237         if (!ok) return((int)n);
3238         s->s3->tmp.reuse_message = 1;
3239         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3240                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3241                 return 2;
3242
3243         return 1;
3244         }
3245 #endif
3246
3247 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3248         {
3249         int i = 0;
3250 #ifndef OPENSSL_NO_ENGINE
3251         if (s->ctx->client_cert_engine)
3252                 {
3253                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3254                                                 SSL_get_client_CA_list(s),
3255                                                 px509, ppkey, NULL, NULL, NULL);
3256                 if (i != 0)
3257                         return i;
3258                 }
3259 #endif
3260         if (s->ctx->client_cert_cb)
3261                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3262         return i;
3263         }