ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 {
 310 #ifndef OPENSSL_NO_TLSEXT
 311                                 /* The server hello indicated that
 312                                  * an audit proof would follow. */
 313                                 if (s->s3->tlsext_authz_server_promised)
 314                                         s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 315                                 else
 316 #endif
 317                                         s->state=SSL3_ST_CR_CERT_A;
 318                                 }
 319                         s->init_num=0;
 320                         break;
 321 #ifndef OPENSSL_NO_TLSEXT
 322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
 323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
 324                         ret = tls1_get_server_supplemental_data(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_A;
 327                         s->init_num = 0;
 328                         break;
 329 #endif
 330                 case SSL3_ST_CR_CERT_A:
 331                 case SSL3_ST_CR_CERT_B:
 332 #ifndef OPENSSL_NO_TLSEXT
 333                         ret=ssl3_check_finished(s);
 334                         if (ret <= 0) goto end;
 335                         if (ret == 2)
 336                                 {
 337                                 s->hit = 1;
 338                                 if (s->tlsext_ticket_expected)
 339                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_FINISHED_A;
 342                                 s->init_num=0;
 343                                 break;
 344                                 }
 345 #endif
 346                         /* Check if it is anon DH/ECDH */
 347                         /* or PSK */
 348                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 349                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 350                                 {
 351                                 ret=ssl3_get_server_certificate(s);
 352                                 if (ret <= 0) goto end;
 353 #ifndef OPENSSL_NO_TLSEXT
 354                                 if (s->tlsext_status_expected)
 355                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 356                                 else
 357                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 358                                 }
 359                         else
 360                                 {
 361                                 skip = 1;
 362                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 363                                 }
 364 #else
 365                                 }
 366                         else
 367                                 skip=1;
 368
 369                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 370 #endif
 371                         s->init_num=0;
 372                         break;
 373
 374                 case SSL3_ST_CR_KEY_EXCH_A:
 375                 case SSL3_ST_CR_KEY_EXCH_B:
 376                         ret=ssl3_get_key_exchange(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_CERT_REQ_A;
 379                         s->init_num=0;
 380
 381                         /* at this point we check that we have the
 382                          * required stuff from the server */
 383                         if (!ssl3_check_cert_and_algorithm(s))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388                         break;
 389
 390                 case SSL3_ST_CR_CERT_REQ_A:
 391                 case SSL3_ST_CR_CERT_REQ_B:
 392                         ret=ssl3_get_certificate_request(s);
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CR_SRVR_DONE_A:
 399                 case SSL3_ST_CR_SRVR_DONE_B:
 400                         ret=ssl3_get_server_done(s);
 401                         if (ret <= 0) goto end;
 402 #ifndef OPENSSL_NO_SRP
 403                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 404                                 {
 405                                 if ((ret = SRP_Calc_A_param(s))<=0)
 406                                         {
 407                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 408                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 409                                         goto end;
 410                                         }
 411                                 }
 412 #endif
 413                         if (s->s3->tmp.cert_req)
 414                                 s->state=SSL3_ST_CW_CERT_A;
 415                         else
 416                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 417                         s->init_num=0;
 418
 419                         break;
 420
 421                 case SSL3_ST_CW_CERT_A:
 422                 case SSL3_ST_CW_CERT_B:
 423                 case SSL3_ST_CW_CERT_C:
 424                 case SSL3_ST_CW_CERT_D:
 425                         ret=ssl3_send_client_certificate(s);
 426                         if (ret <= 0) goto end;
 427                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 428                         s->init_num=0;
 429                         break;
 430
 431                 case SSL3_ST_CW_KEY_EXCH_A:
 432                 case SSL3_ST_CW_KEY_EXCH_B:
 433                         ret=ssl3_send_client_key_exchange(s);
 434                         if (ret <= 0) goto end;
 435                         /* EAY EAY EAY need to check for DH fix cert
 436                          * sent back */
 437                         /* For TLS, cert_req is set to 2, so a cert chain
 438                          * of nothing is sent, but no verify packet is sent */
 439                         /* XXX: For now, we do not support client
 440                          * authentication in ECDH cipher suites with
 441                          * ECDH (rather than ECDSA) certificates.
 442                          * We need to skip the certificate verify
 443                          * message when client's ECDH public key is sent
 444                          * inside the client certificate.
 445                          */
 446                         if (s->s3->tmp.cert_req == 1)
 447                                 {
 448                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 449                                 }
 450                         else
 451                                 {
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                                 s->s3->change_cipher_spec=0;
 454                                 }
 455                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 456                                 {
 457                                 s->state=SSL3_ST_CW_CHANGE_A;
 458                                 s->s3->change_cipher_spec=0;
 459                                 }
 460
 461                         s->init_num=0;
 462                         break;
 463
 464                 case SSL3_ST_CW_CERT_VRFY_A:
 465                 case SSL3_ST_CW_CERT_VRFY_B:
 466                         ret=ssl3_send_client_verify(s);
 467                         if (ret <= 0) goto end;
 468                         s->state=SSL3_ST_CW_CHANGE_A;
 469                         s->init_num=0;
 470                         s->s3->change_cipher_spec=0;
 471                         break;
 472
 473                 case SSL3_ST_CW_CHANGE_A:
 474                 case SSL3_ST_CW_CHANGE_B:
 475                         ret=ssl3_send_change_cipher_spec(s,
 476                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 477                         if (ret <= 0) goto end;
 478
 479 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 480                         s->state=SSL3_ST_CW_FINISHED_A;
 481 #else
 482                         if (s->s3->next_proto_neg_seen)
 483                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 484                         else
 485                                 s->state=SSL3_ST_CW_FINISHED_A;
 486 #endif
 487                         s->init_num=0;
 488
 489                         s->session->cipher=s->s3->tmp.new_cipher;
 490 #ifdef OPENSSL_NO_COMP
 491                         s->session->compress_meth=0;
 492 #else
 493                         if (s->s3->tmp.new_compression == NULL)
 494                                 s->session->compress_meth=0;
 495                         else
 496                                 s->session->compress_meth=
 497                                         s->s3->tmp.new_compression->id;
 498 #endif
 499                         if (!s->method->ssl3_enc->setup_key_block(s))
 500                                 {
 501                                 ret= -1;
 502                                 goto end;
 503                                 }
 504
 505                         if (!s->method->ssl3_enc->change_cipher_state(s,
 506                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 507                                 {
 508                                 ret= -1;
 509                                 goto end;
 510                                 }
 511
 512                         break;
 513
 514 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 515                 case SSL3_ST_CW_NEXT_PROTO_A:
 516                 case SSL3_ST_CW_NEXT_PROTO_B:
 517                         ret=ssl3_send_next_proto(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CW_FINISHED_A;
 520                         break;
 521 #endif
 522
 523                 case SSL3_ST_CW_FINISHED_A:
 524                 case SSL3_ST_CW_FINISHED_B:
 525                         ret=ssl3_send_finished(s,
 526                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 527                                 s->method->ssl3_enc->client_finished_label,
 528                                 s->method->ssl3_enc->client_finished_label_len);
 529                         if (ret <= 0) goto end;
 530                         s->state=SSL3_ST_CW_FLUSH;
 531
 532                         /* clear flags */
 533                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 534                         if (s->hit)
 535                                 {
 536                                 s->s3->tmp.next_state=SSL_ST_OK;
 537                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 538                                         {
 539                                         s->state=SSL_ST_OK;
 540                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 541                                         s->s3->delay_buf_pop_ret=0;
 542                                         }
 543                                 }
 544                         else
 545                                 {
 546 #ifndef OPENSSL_NO_TLSEXT
 547                                 /* Allow NewSessionTicket if ticket expected */
 548                                 if (s->tlsext_ticket_expected)
 549                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 550                                 else
 551 #endif
 552
 553                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 554                                 }
 555                         s->init_num=0;
 556                         break;
 557
 558 #ifndef OPENSSL_NO_TLSEXT
 559                 case SSL3_ST_CR_SESSION_TICKET_A:
 560                 case SSL3_ST_CR_SESSION_TICKET_B:
 561                         ret=ssl3_get_new_session_ticket(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_CR_FINISHED_A;
 564                         s->init_num=0;
 565                 break;
 566
 567                 case SSL3_ST_CR_CERT_STATUS_A:
 568                 case SSL3_ST_CR_CERT_STATUS_B:
 569                         ret=ssl3_get_cert_status(s);
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 572                         s->init_num=0;
 573                 break;
 574 #endif
 575
 576                 case SSL3_ST_CR_FINISHED_A:
 577                 case SSL3_ST_CR_FINISHED_B:
 578
 579                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 580                                 SSL3_ST_CR_FINISHED_B);
 581                         if (ret <= 0) goto end;
 582
 583                         if (s->hit)
 584                                 s->state=SSL3_ST_CW_CHANGE_A;
 585                         else
 586                                 s->state=SSL_ST_OK;
 587                         s->init_num=0;
 588                         break;
 589
 590                 case SSL3_ST_CW_FLUSH:
 591                         s->rwstate=SSL_WRITING;
 592                         if (BIO_flush(s->wbio) <= 0)
 593                                 {
 594                                 ret= -1;
 595                                 goto end;
 596                                 }
 597                         s->rwstate=SSL_NOTHING;
 598                         s->state=s->s3->tmp.next_state;
 599                         break;
 600
 601                 case SSL_ST_OK:
 602                         /* clean a few things up */
 603                         ssl3_cleanup_key_block(s);
 604
 605                         if (s->init_buf != NULL)
 606                                 {
 607                                 BUF_MEM_free(s->init_buf);
 608                                 s->init_buf=NULL;
 609                                 }
 610
 611                         /* If we are not 'joining' the last two packets,
 612                          * remove the buffering now */
 613                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 614                                 ssl_free_wbio_buffer(s);
 615                         /* else do it later in ssl3_write */
 616
 617                         s->init_num=0;
 618                         s->renegotiate=0;
 619                         s->new_session=0;
 620
 621                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 622                         if (s->hit) s->ctx->stats.sess_hit++;
 623
 624                         ret=1;
 625                         /* s->server=0; */
 626                         s->handshake_func=ssl3_connect;
 627                         s->ctx->stats.sess_connect_good++;
 628
 629                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 630
 631                         goto end;
 632                         /* break; */
 633
 634                 default:
 635                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 636                         ret= -1;
 637                         goto end;
 638                         /* break; */
 639                         }
 640
 641                 /* did we do anything */
 642                 if (!s->s3->tmp.reuse_message && !skip)
 643                         {
 644                         if (s->debug)
 645                                 {
 646                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 647                                         goto end;
 648                                 }
 649
 650                         if ((cb != NULL) && (s->state != state))
 651                                 {
 652                                 new_state=s->state;
 653                                 s->state=state;
 654                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 655                                 s->state=new_state;
 656                                 }
 657                         }
 658                 skip=0;
 659                 }
 660 end:
 661         s->in_handshake--;
 662         if (buf != NULL)
 663                 BUF_MEM_free(buf);
 664         if (cb != NULL)
 665                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 666         return(ret);
 667         }
 668
 669
 670 int ssl3_client_hello(SSL *s)
 671         {
 672         unsigned char *buf;
 673         unsigned char *p,*d;
 674         int i;
 675         unsigned long Time,l;
 676 #ifndef OPENSSL_NO_COMP
 677         int j;
 678         SSL_COMP *comp;
 679 #endif
 680
 681         buf=(unsigned char *)s->init_buf->data;
 682         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 683                 {
 684                 SSL_SESSION *sess = s->session;
 685                 if ((sess == NULL) ||
 686                         (sess->ssl_version != s->version) ||
 687 #ifdef OPENSSL_NO_TLSEXT
 688                         !sess->session_id_length ||
 689 #else
 690                         (!sess->session_id_length && !sess->tlsext_tick) ||
 691 #endif
 692                         (sess->not_resumable))
 693                         {
 694                         if (!ssl_get_new_session(s,0))
 695                                 goto err;
 696                         }
 697                 /* else use the pre-loaded session */
 698
 699                 p=s->s3->client_random;
 700
 701                 /* for DTLS if client_random is initialized, reuse it, we are
 702                  * required to use same upon reply to HelloVerify */
 703                 if (SSL_IS_DTLS(s))
 704                         {
 705                         size_t idx;
 706                         i = 1;
 707                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 708                                 {
 709                                 if (p[idx])
 710                                         {
 711                                         i = 0;
 712                                         break;
 713                                         }
 714                                 }
 715                         }
 716                 else
 717                         i = 1;
 718
 719                 if (i)
 720                         {
 721                         Time=(unsigned long)time(NULL); /* Time */
 722                         l2n(Time,p);
 723                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 724                         }
 725
 726                 /* Do the message type and length last */
 727                 d=p= ssl_handshake_start(s);
 728
 729                 /* version indicates the negotiated version: for example from
 730                  * an SSLv2/v3 compatible client hello). The client_version
 731                  * field is the maximum version we permit and it is also
 732                  * used in RSA encrypted premaster secrets. Some servers can
 733                  * choke if we initially report a higher version then
 734                  * renegotiate to a lower one in the premaster secret. This
 735                  * didn't happen with TLS 1.0 as most servers supported it
 736                  * but it can with TLS 1.1 or later if the server only supports
 737                  * 1.0.
 738                  *
 739                  * Possible scenario with previous logic:
 740                  *      1. Client hello indicates TLS 1.2
 741                  *      2. Server hello says TLS 1.0
 742                  *      3. RSA encrypted premaster secret uses 1.2.
 743                  *      4. Handhaked proceeds using TLS 1.0.
 744                  *      5. Server sends hello request to renegotiate.
 745                  *      6. Client hello indicates TLS v1.0 as we now
 746                  *         know that is maximum server supports.
 747                  *      7. Server chokes on RSA encrypted premaster secret
 748                  *         containing version 1.0.
 749                  *
 750                  * For interoperability it should be OK to always use the
 751                  * maximum version we support in client hello and then rely
 752                  * on the checking of version to ensure the servers isn't
 753                  * being inconsistent: for example initially negotiating with
 754                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 755                  * client_version in client hello and not resetting it to
 756                  * the negotiated version.
 757                  */
 758 #if 0
 759                 *(p++)=s->version>>8;
 760                 *(p++)=s->version&0xff;
 761                 s->client_version=s->version;
 762 #else
 763                 *(p++)=s->client_version>>8;
 764                 *(p++)=s->client_version&0xff;
 765 #endif
 766
 767                 /* Random stuff */
 768                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 769                 p+=SSL3_RANDOM_SIZE;
 770
 771                 /* Session ID */
 772                 if (s->new_session)
 773                         i=0;
 774                 else
 775                         i=s->session->session_id_length;
 776                 *(p++)=i;
 777                 if (i != 0)
 778                         {
 779                         if (i > (int)sizeof(s->session->session_id))
 780                                 {
 781                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 782                                 goto err;
 783                                 }
 784                         memcpy(p,s->session->session_id,i);
 785                         p+=i;
 786                         }
 787
 788                 /* cookie stuff for DTLS */
 789                 if (SSL_IS_DTLS(s))
 790                         {
 791                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 792                                 {
 793                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 794                                 goto err;
 795                                 }
 796                         *(p++) = s->d1->cookie_len;
 797                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 798                         p += s->d1->cookie_len;
 799                         }
 800
 801                 /* Ciphers supported */
 802                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 803                 if (i == 0)
 804                         {
 805                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 806                         goto err;
 807                         }
 808 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 809                         /* Some servers hang if client hello > 256 bytes
 810                          * as hack workaround chop number of supported ciphers
 811                          * to keep it well below this if we use TLS v1.2
 812                          */
 813                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 814                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 815                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 816 #endif
 817                 s2n(i,p);
 818                 p+=i;
 819
 820                 /* COMPRESSION */
 821 #ifdef OPENSSL_NO_COMP
 822                 *(p++)=1;
 823 #else
 824
 825                 if ((s->options & SSL_OP_NO_COMPRESSION)
 826                                         || !s->ctx->comp_methods)
 827                         j=0;
 828                 else
 829                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 830                 *(p++)=1+j;
 831                 for (i=0; i<j; i++)
 832                         {
 833                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 834                         *(p++)=comp->id;
 835                         }
 836 #endif
 837                 *(p++)=0; /* Add the NULL method */
 838
 839 #ifndef OPENSSL_NO_TLSEXT
 840                 /* TLS extensions*/
 841                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 842                         {
 843                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 844                         goto err;
 845                         }
 846                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 847                         {
 848                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 849                         goto err;
 850                         }
 851 #endif
 852
 853                 l= p-d;
 854                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 855                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 856                 }
 857
 858         /* SSL3_ST_CW_CLNT_HELLO_B */
 859         return ssl_do_write(s);
 860 err:
 861         return(-1);
 862         }
 863
 864 int ssl3_get_server_hello(SSL *s)
 865         {
 866         STACK_OF(SSL_CIPHER) *sk;
 867         const SSL_CIPHER *c;
 868         CERT *ct = s->cert;
 869         unsigned char *p,*d;
 870         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 871         unsigned int j;
 872         long n;
 873 #ifndef OPENSSL_NO_COMP
 874         SSL_COMP *comp;
 875 #endif
 876
 877         n=s->method->ssl_get_message(s,
 878                 SSL3_ST_CR_SRVR_HELLO_A,
 879                 SSL3_ST_CR_SRVR_HELLO_B,
 880                 -1,
 881                 20000, /* ?? */
 882                 &ok);
 883
 884         if (!ok) return((int)n);
 885
 886         if (SSL_IS_DTLS(s))
 887                 {
 888                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 889                         {
 890                         if ( s->d1->send_cookie == 0)
 891                                 {
 892                                 s->s3->tmp.reuse_message = 1;
 893                                 return 1;
 894                                 }
 895                         else /* already sent a cookie */
 896                                 {
 897                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 898                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 899                                 goto f_err;
 900                                 }
 901                         }
 902                 }
 903
 904         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 905                 {
 906                 al=SSL_AD_UNEXPECTED_MESSAGE;
 907                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 908                 goto f_err;
 909                 }
 910
 911         d=p=(unsigned char *)s->init_msg;
 912
 913         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 914                 {
 915                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 916                 s->version=(s->version&0xff00)|p[1];
 917                 al=SSL_AD_PROTOCOL_VERSION;
 918                 goto f_err;
 919                 }
 920         p+=2;
 921
 922         /* load the server hello data */
 923         /* load the server random */
 924         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 925         p+=SSL3_RANDOM_SIZE;
 926
 927         /* get the session-id */
 928         j= *(p++);
 929
 930         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 931                 {
 932                 al=SSL_AD_ILLEGAL_PARAMETER;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 934                 goto f_err;
 935                 }
 936
 937 #ifndef OPENSSL_NO_TLSEXT
 938         /* check if we want to resume the session based on external pre-shared secret */
 939         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 940                 {
 941                 SSL_CIPHER *pref_cipher=NULL;
 942                 s->session->master_key_length=sizeof(s->session->master_key);
 943                 if (s->tls_session_secret_cb(s, s->session->master_key,
 944                                              &s->session->master_key_length,
 945                                              NULL, &pref_cipher,
 946                                              s->tls_session_secret_cb_arg))
 947                         {
 948                         s->session->cipher = pref_cipher ?
 949                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 950                         }
 951                 }
 952 #endif /* OPENSSL_NO_TLSEXT */
 953
 954         if (j != 0 && j == s->session->session_id_length
 955             && memcmp(p,s->session->session_id,j) == 0)
 956             {
 957             if(s->sid_ctx_length != s->session->sid_ctx_length
 958                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 959                 {
 960                 /* actually a client application bug */
 961                 al=SSL_AD_ILLEGAL_PARAMETER;
 962                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 963                 goto f_err;
 964                 }
 965             s->hit=1;
 966             }
 967         else    /* a miss or crap from the other end */
 968                 {
 969                 /* If we were trying for session-id reuse, make a new
 970                  * SSL_SESSION so we don't stuff up other people */
 971                 s->hit=0;
 972                 if (s->session->session_id_length > 0)
 973                         {
 974                         if (!ssl_get_new_session(s,0))
 975                                 {
 976                                 goto f_err;
 977                                 }
 978                         }
 979                 s->session->session_id_length=j;
 980                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 981                 }
 982         p+=j;
 983         c=ssl_get_cipher_by_char(s,p);
 984         if (c == NULL)
 985                 {
 986                 /* unknown cipher */
 987                 al=SSL_AD_ILLEGAL_PARAMETER;
 988                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 989                 goto f_err;
 990                 }
 991         /* If it is a disabled cipher we didn't send it in client hello,
 992          * so return an error.
 993          */
 994         if (c->algorithm_ssl & ct->mask_ssl ||
 995                 c->algorithm_mkey & ct->mask_k ||
 996                 c->algorithm_auth & ct->mask_a)
 997                 {
 998                 al=SSL_AD_ILLEGAL_PARAMETER;
 999                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1000                 goto f_err;
1001                 }
1002         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1003
1004         sk=ssl_get_ciphers_by_id(s);
1005         i=sk_SSL_CIPHER_find(sk,c);
1006         if (i < 0)
1007                 {
1008                 /* we did not say we would use this cipher */
1009                 al=SSL_AD_ILLEGAL_PARAMETER;
1010                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1011                 goto f_err;
1012                 }
1013
1014         /* Depending on the session caching (internal/external), the cipher
1015            and/or cipher_id values may not be set. Make sure that
1016            cipher_id is set and use it for comparison. */
1017         if (s->session->cipher)
1018                 s->session->cipher_id = s->session->cipher->id;
1019         if (s->hit && (s->session->cipher_id != c->id))
1020                 {
1021 /* Workaround is now obsolete */
1022 #if 0
1023                 if (!(s->options &
1024                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1025 #endif
1026                         {
1027                         al=SSL_AD_ILLEGAL_PARAMETER;
1028                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1029                         goto f_err;
1030                         }
1031                 }
1032         s->s3->tmp.new_cipher=c;
1033         /* Don't digest cached records if no sigalgs: we may need them for
1034          * client authentication.
1035          */
1036         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1037                 goto f_err;
1038         /* lets get the compression algorithm */
1039         /* COMPRESSION */
1040 #ifdef OPENSSL_NO_COMP
1041         if (*(p++) != 0)
1042                 {
1043                 al=SSL_AD_ILLEGAL_PARAMETER;
1044                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1045                 goto f_err;
1046                 }
1047         /* If compression is disabled we'd better not try to resume a session
1048          * using compression.
1049          */
1050         if (s->session->compress_meth != 0)
1051                 {
1052                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1053                 goto f_err;
1054                 }
1055 #else
1056         j= *(p++);
1057         if (s->hit && j != s->session->compress_meth)
1058                 {
1059                 al=SSL_AD_ILLEGAL_PARAMETER;
1060                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1061                 goto f_err;
1062                 }
1063         if (j == 0)
1064                 comp=NULL;
1065         else if (s->options & SSL_OP_NO_COMPRESSION)
1066                 {
1067                 al=SSL_AD_ILLEGAL_PARAMETER;
1068                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1069                 goto f_err;
1070                 }
1071         else
1072                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1073
1074         if ((j != 0) && (comp == NULL))
1075                 {
1076                 al=SSL_AD_ILLEGAL_PARAMETER;
1077                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1078                 goto f_err;
1079                 }
1080         else
1081                 {
1082                 s->s3->tmp.new_compression=comp;
1083                 }
1084 #endif
1085
1086 #ifndef OPENSSL_NO_TLSEXT
1087         /* TLS extensions*/
1088         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1089                 {
1090                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1091                 goto err;
1092                 }
1093 #endif
1094
1095         if (p != (d+n))
1096                 {
1097                 /* wrong packet length */
1098                 al=SSL_AD_DECODE_ERROR;
1099                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1100                 goto f_err;
1101                 }
1102
1103         return(1);
1104 f_err:
1105         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1106 err:
1107         return(-1);
1108         }
1109
1110 int ssl3_get_server_certificate(SSL *s)
1111         {
1112         int al,i,ok,ret= -1;
1113         unsigned long n,nc,llen,l;
1114         X509 *x=NULL;
1115         const unsigned char *q,*p;
1116         unsigned char *d;
1117         STACK_OF(X509) *sk=NULL;
1118         SESS_CERT *sc;
1119         EVP_PKEY *pkey=NULL;
1120         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1121
1122         n=s->method->ssl_get_message(s,
1123                 SSL3_ST_CR_CERT_A,
1124                 SSL3_ST_CR_CERT_B,
1125                 -1,
1126                 s->max_cert_list,
1127                 &ok);
1128
1129         if (!ok) return((int)n);
1130
1131         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1132                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1133                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1134                 {
1135                 s->s3->tmp.reuse_message=1;
1136                 return(1);
1137                 }
1138
1139         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1140                 {
1141                 al=SSL_AD_UNEXPECTED_MESSAGE;
1142                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1143                 goto f_err;
1144                 }
1145         p=d=(unsigned char *)s->init_msg;
1146
1147         if ((sk=sk_X509_new_null()) == NULL)
1148                 {
1149                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1150                 goto err;
1151                 }
1152
1153         n2l3(p,llen);
1154         if (llen+3 != n)
1155                 {
1156                 al=SSL_AD_DECODE_ERROR;
1157                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1158                 goto f_err;
1159                 }
1160         for (nc=0; nc<llen; )
1161                 {
1162                 n2l3(p,l);
1163                 if ((l+nc+3) > llen)
1164                         {
1165                         al=SSL_AD_DECODE_ERROR;
1166                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1167                         goto f_err;
1168                         }
1169
1170                 q=p;
1171                 x=d2i_X509(NULL,&q,l);
1172                 if (x == NULL)
1173                         {
1174                         al=SSL_AD_BAD_CERTIFICATE;
1175                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1176                         goto f_err;
1177                         }
1178                 if (q != (p+l))
1179                         {
1180                         al=SSL_AD_DECODE_ERROR;
1181                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1182                         goto f_err;
1183                         }
1184                 if (!sk_X509_push(sk,x))
1185                         {
1186                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1187                         goto err;
1188                         }
1189                 x=NULL;
1190                 nc+=l+3;
1191                 p=q;
1192                 }
1193
1194         i=ssl_verify_cert_chain(s,sk);
1195         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1196 #ifndef OPENSSL_NO_KRB5
1197             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1198                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1199 #endif /* OPENSSL_NO_KRB5 */
1200                 )
1201                 {
1202                 al=ssl_verify_alarm_type(s->verify_result);
1203                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1204                 goto f_err;
1205                 }
1206         ERR_clear_error(); /* but we keep s->verify_result */
1207
1208         sc=ssl_sess_cert_new();
1209         if (sc == NULL) goto err;
1210
1211         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1212         s->session->sess_cert=sc;
1213
1214         sc->cert_chain=sk;
1215         /* Inconsistency alert: cert_chain does include the peer's
1216          * certificate, which we don't include in s3_srvr.c */
1217         x=sk_X509_value(sk,0);
1218         sk=NULL;
1219         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1220
1221         pkey=X509_get_pubkey(x);
1222
1223         /* VRS: allow null cert if auth == KRB5 */
1224         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1225                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1226                     ? 0 : 1;
1227
1228 #ifdef KSSL_DEBUG
1229         printf("pkey,x = %p, %p\n", pkey,x);
1230         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1231         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1232                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1233 #endif    /* KSSL_DEBUG */
1234
1235         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1236                 {
1237                 x=NULL;
1238                 al=SSL3_AL_FATAL;
1239                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1240                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1241                 goto f_err;
1242                 }
1243
1244         i=ssl_cert_type(x,pkey);
1245         if (need_cert && i < 0)
1246                 {
1247                 x=NULL;
1248                 al=SSL3_AL_FATAL;
1249                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1250                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1251                 goto f_err;
1252                 }
1253
1254         if (need_cert)
1255                 {
1256                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1257                 if (exp_idx >= 0 && i != exp_idx)
1258                         {
1259                         x=NULL;
1260                         al=SSL_AD_ILLEGAL_PARAMETER;
1261                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1262                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1263                         goto f_err;
1264                         }
1265                 sc->peer_cert_type=i;
1266                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1267                 /* Why would the following ever happen?
1268                  * We just created sc a couple of lines ago. */
1269                 if (sc->peer_pkeys[i].x509 != NULL)
1270                         X509_free(sc->peer_pkeys[i].x509);
1271                 sc->peer_pkeys[i].x509=x;
1272                 sc->peer_key= &(sc->peer_pkeys[i]);
1273
1274                 if (s->session->peer != NULL)
1275                         X509_free(s->session->peer);
1276                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1277                 s->session->peer=x;
1278                 }
1279         else
1280                 {
1281                 sc->peer_cert_type=i;
1282                 sc->peer_key= NULL;
1283
1284                 if (s->session->peer != NULL)
1285                         X509_free(s->session->peer);
1286                 s->session->peer=NULL;
1287                 }
1288         s->session->verify_result = s->verify_result;
1289
1290         x=NULL;
1291 #ifndef OPENSSL_NO_TLSEXT
1292         /* Check the audit proof. */
1293         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1294                 {
1295                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1296                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1297                 if (ret <= 0)
1298                         {
1299                         al = SSL_AD_BAD_CERTIFICATE;
1300                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1301                         goto f_err;
1302                         }
1303                 }
1304
1305 #endif
1306         ret=1;
1307         if (0)
1308                 {
1309 f_err:
1310                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1311                 }
1312 err:
1313         EVP_PKEY_free(pkey);
1314         X509_free(x);
1315         sk_X509_pop_free(sk,X509_free);
1316         return(ret);
1317         }
1318
1319 int ssl3_get_key_exchange(SSL *s)
1320         {
1321 #ifndef OPENSSL_NO_RSA
1322         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1323 #endif
1324         EVP_MD_CTX md_ctx;
1325         unsigned char *param,*p;
1326         int al,i,j,param_len,ok;
1327         long n,alg_k,alg_a;
1328         EVP_PKEY *pkey=NULL;
1329         const EVP_MD *md = NULL;
1330 #ifndef OPENSSL_NO_RSA
1331         RSA *rsa=NULL;
1332 #endif
1333 #ifndef OPENSSL_NO_DH
1334         DH *dh=NULL;
1335 #endif
1336 #ifndef OPENSSL_NO_ECDH
1337         EC_KEY *ecdh = NULL;
1338         BN_CTX *bn_ctx = NULL;
1339         EC_POINT *srvr_ecpoint = NULL;
1340         int curve_nid = 0;
1341         int encoded_pt_len = 0;
1342 #endif
1343
1344         /* use same message size as in ssl3_get_certificate_request()
1345          * as ServerKeyExchange message may be skipped */
1346         n=s->method->ssl_get_message(s,
1347                 SSL3_ST_CR_KEY_EXCH_A,
1348                 SSL3_ST_CR_KEY_EXCH_B,
1349                 -1,
1350                 s->max_cert_list,
1351                 &ok);
1352         if (!ok) return((int)n);
1353
1354         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1355                 {
1356 #ifndef OPENSSL_NO_PSK
1357                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1358                    omitted if no identity hint is sent. Set
1359                    session->sess_cert anyway to avoid problems
1360                    later.*/
1361                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1362                         {
1363                         s->session->sess_cert=ssl_sess_cert_new();
1364                         if (s->ctx->psk_identity_hint)
1365                                 OPENSSL_free(s->ctx->psk_identity_hint);
1366                         s->ctx->psk_identity_hint = NULL;
1367                         }
1368 #endif
1369                 s->s3->tmp.reuse_message=1;
1370                 return(1);
1371                 }
1372
1373         param=p=(unsigned char *)s->init_msg;
1374         if (s->session->sess_cert != NULL)
1375                 {
1376 #ifndef OPENSSL_NO_RSA
1377                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1378                         {
1379                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1380                         s->session->sess_cert->peer_rsa_tmp=NULL;
1381                         }
1382 #endif
1383 #ifndef OPENSSL_NO_DH
1384                 if (s->session->sess_cert->peer_dh_tmp)
1385                         {
1386                         DH_free(s->session->sess_cert->peer_dh_tmp);
1387                         s->session->sess_cert->peer_dh_tmp=NULL;
1388                         }
1389 #endif
1390 #ifndef OPENSSL_NO_ECDH
1391                 if (s->session->sess_cert->peer_ecdh_tmp)
1392                         {
1393                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1394                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1395                         }
1396 #endif
1397                 }
1398         else
1399                 {
1400                 s->session->sess_cert=ssl_sess_cert_new();
1401                 }
1402
1403         param_len=0;
1404         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1405         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1406         EVP_MD_CTX_init(&md_ctx);
1407
1408 #ifndef OPENSSL_NO_PSK
1409         if (alg_k & SSL_kPSK)
1410                 {
1411                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1412
1413                 al=SSL_AD_HANDSHAKE_FAILURE;
1414                 n2s(p,i);
1415                 param_len=i+2;
1416                 /* Store PSK identity hint for later use, hint is used
1417                  * in ssl3_send_client_key_exchange.  Assume that the
1418                  * maximum length of a PSK identity hint can be as
1419                  * long as the maximum length of a PSK identity. */
1420                 if (i > PSK_MAX_IDENTITY_LEN)
1421                         {
1422                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1423                                 SSL_R_DATA_LENGTH_TOO_LONG);
1424                         goto f_err;
1425                         }
1426                 if (param_len > n)
1427                         {
1428                         al=SSL_AD_DECODE_ERROR;
1429                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1430                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1431                         goto f_err;
1432                         }
1433                 /* If received PSK identity hint contains NULL
1434                  * characters, the hint is truncated from the first
1435                  * NULL. p may not be ending with NULL, so create a
1436                  * NULL-terminated string. */
1437                 memcpy(tmp_id_hint, p, i);
1438                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1439                 if (s->ctx->psk_identity_hint != NULL)
1440                         OPENSSL_free(s->ctx->psk_identity_hint);
1441                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1442                 if (s->ctx->psk_identity_hint == NULL)
1443                         {
1444                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1445                         goto f_err;
1446                         }
1447
1448                 p+=i;
1449                 n-=param_len;
1450                 }
1451         else
1452 #endif /* !OPENSSL_NO_PSK */
1453 #ifndef OPENSSL_NO_SRP
1454         if (alg_k & SSL_kSRP)
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_SRP_N_LENGTH);
1462                         goto f_err;
1463                         }
1464                 if (!(s->srp_ctx.N=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_SRP_G_LENGTH);
1477                         goto f_err;
1478                         }
1479                 if (!(s->srp_ctx.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                 i = (unsigned int)(p[0]);
1487                 p++;
1488                 param_len+=i+1;
1489                 if (param_len > n)
1490                         {
1491                         al=SSL_AD_DECODE_ERROR;
1492                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1493                         goto f_err;
1494                         }
1495                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1496                         {
1497                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1498                         goto err;
1499                         }
1500                 p+=i;
1501
1502                 n2s(p,i);
1503                 param_len+=i+2;
1504                 if (param_len > n)
1505                         {
1506                         al=SSL_AD_DECODE_ERROR;
1507                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1508                         goto f_err;
1509                         }
1510                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1511                         {
1512                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1513                         goto err;
1514                         }
1515                 p+=i;
1516                 n-=param_len;
1517
1518 /* We must check if there is a certificate */
1519 #ifndef OPENSSL_NO_RSA
1520                 if (alg_a & SSL_aRSA)
1521                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1522 #else
1523                 if (0)
1524                         ;
1525 #endif
1526 #ifndef OPENSSL_NO_DSA
1527                 else if (alg_a & SSL_aDSS)
1528                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1529 #endif
1530                 }
1531         else
1532 #endif /* !OPENSSL_NO_SRP */
1533 #ifndef OPENSSL_NO_RSA
1534         if (alg_k & SSL_kRSA)
1535                 {
1536                 if ((rsa=RSA_new()) == NULL)
1537                         {
1538                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1539                         goto err;
1540                         }
1541                 n2s(p,i);
1542                 param_len=i+2;
1543                 if (param_len > n)
1544                         {
1545                         al=SSL_AD_DECODE_ERROR;
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1547                         goto f_err;
1548                         }
1549                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1550                         {
1551                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1552                         goto err;
1553                         }
1554                 p+=i;
1555
1556                 n2s(p,i);
1557                 param_len+=i+2;
1558                 if (param_len > n)
1559                         {
1560                         al=SSL_AD_DECODE_ERROR;
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1562                         goto f_err;
1563                         }
1564                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1565                         {
1566                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1567                         goto err;
1568                         }
1569                 p+=i;
1570                 n-=param_len;
1571
1572                 /* this should be because we are using an export cipher */
1573                 if (alg_a & SSL_aRSA)
1574                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1575                 else
1576                         {
1577                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1578                         goto err;
1579                         }
1580                 s->session->sess_cert->peer_rsa_tmp=rsa;
1581                 rsa=NULL;
1582                 }
1583 #else /* OPENSSL_NO_RSA */
1584         if (0)
1585                 ;
1586 #endif
1587 #ifndef OPENSSL_NO_DH
1588         else if (alg_k & SSL_kEDH)
1589                 {
1590                 if ((dh=DH_new()) == NULL)
1591                         {
1592                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1593                         goto err;
1594                         }
1595                 n2s(p,i);
1596                 param_len=i+2;
1597                 if (param_len > n)
1598                         {
1599                         al=SSL_AD_DECODE_ERROR;
1600                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1601                         goto f_err;
1602                         }
1603                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1604                         {
1605                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1606                         goto err;
1607                         }
1608                 p+=i;
1609
1610                 n2s(p,i);
1611                 param_len+=i+2;
1612                 if (param_len > n)
1613                         {
1614                         al=SSL_AD_DECODE_ERROR;
1615                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1616                         goto f_err;
1617                         }
1618                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1619                         {
1620                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1621                         goto err;
1622                         }
1623                 p+=i;
1624
1625                 n2s(p,i);
1626                 param_len+=i+2;
1627                 if (param_len > n)
1628                         {
1629                         al=SSL_AD_DECODE_ERROR;
1630                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1631                         goto f_err;
1632                         }
1633                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1636                         goto err;
1637                         }
1638                 p+=i;
1639                 n-=param_len;
1640
1641 #ifndef OPENSSL_NO_RSA
1642                 if (alg_a & SSL_aRSA)
1643                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1644 #else
1645                 if (0)
1646                         ;
1647 #endif
1648 #ifndef OPENSSL_NO_DSA
1649                 else if (alg_a & SSL_aDSS)
1650                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1651 #endif
1652                 /* else anonymous DH, so no certificate or pkey. */
1653
1654                 s->session->sess_cert->peer_dh_tmp=dh;
1655                 dh=NULL;
1656                 }
1657         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1658                 {
1659                 al=SSL_AD_ILLEGAL_PARAMETER;
1660                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1661                 goto f_err;
1662                 }
1663 #endif /* !OPENSSL_NO_DH */
1664
1665 #ifndef OPENSSL_NO_ECDH
1666         else if (alg_k & SSL_kEECDH)
1667                 {
1668                 EC_GROUP *ngroup;
1669                 const EC_GROUP *group;
1670
1671                 if ((ecdh=EC_KEY_new()) == NULL)
1672                         {
1673                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1674                         goto err;
1675                         }
1676
1677                 /* Extract elliptic curve parameters and the
1678                  * server's ephemeral ECDH public key.
1679                  * Keep accumulating lengths of various components in
1680                  * param_len and make sure it never exceeds n.
1681                  */
1682
1683                 /* XXX: For now we only support named (not generic) curves
1684                  * and the ECParameters in this case is just three bytes.
1685                  */
1686                 param_len=3;
1687                 /* Check curve is one of our prefrences, if not server has
1688                  * sent an invalid curve.
1689                  */
1690                 if (!tls1_check_curve(s, p, param_len))
1691                         {
1692                         al=SSL_AD_DECODE_ERROR;
1693                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1694                         goto f_err;
1695                         }
1696
1697                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1698                         {
1699                         al=SSL_AD_INTERNAL_ERROR;
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1701                         goto f_err;
1702                         }
1703
1704                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1705                 if (ngroup == NULL)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1708                         goto err;
1709                         }
1710                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1711                         {
1712                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1713                         goto err;
1714                         }
1715                 EC_GROUP_free(ngroup);
1716
1717                 group = EC_KEY_get0_group(ecdh);
1718
1719                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1720                     (EC_GROUP_get_degree(group) > 163))
1721                         {
1722                         al=SSL_AD_EXPORT_RESTRICTION;
1723                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1724                         goto f_err;
1725                         }
1726
1727                 p+=3;
1728
1729                 /* Next, get the encoded ECPoint */
1730                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1731                     ((bn_ctx = BN_CTX_new()) == NULL))
1732                         {
1733                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1734                         goto err;
1735                         }
1736
1737                 encoded_pt_len = *p;  /* length of encoded point */
1738                 p+=1;
1739                 param_len += (1 + encoded_pt_len);
1740                 if ((param_len > n) ||
1741                     (EC_POINT_oct2point(group, srvr_ecpoint,
1742                         p, encoded_pt_len, bn_ctx) == 0))
1743                         {
1744                         al=SSL_AD_DECODE_ERROR;
1745                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1746                         goto f_err;
1747                         }
1748
1749                 n-=param_len;
1750                 p+=encoded_pt_len;
1751
1752                 /* The ECC/TLS specification does not mention
1753                  * the use of DSA to sign ECParameters in the server
1754                  * key exchange message. We do support RSA and ECDSA.
1755                  */
1756                 if (0) ;
1757 #ifndef OPENSSL_NO_RSA
1758                 else if (alg_a & SSL_aRSA)
1759                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1760 #endif
1761 #ifndef OPENSSL_NO_ECDSA
1762                 else if (alg_a & SSL_aECDSA)
1763                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1764 #endif
1765                 /* else anonymous ECDH, so no certificate or pkey. */
1766                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1767                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1768                 ecdh=NULL;
1769                 BN_CTX_free(bn_ctx);
1770                 bn_ctx = NULL;
1771                 EC_POINT_free(srvr_ecpoint);
1772                 srvr_ecpoint = NULL;
1773                 }
1774         else if (alg_k)
1775                 {
1776                 al=SSL_AD_UNEXPECTED_MESSAGE;
1777                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1778                 goto f_err;
1779                 }
1780 #endif /* !OPENSSL_NO_ECDH */
1781
1782
1783         /* p points to the next byte, there are 'n' bytes left */
1784
1785         /* if it was signed, check the signature */
1786         if (pkey != NULL)
1787                 {
1788                 if (SSL_USE_SIGALGS(s))
1789                         {
1790                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1791                         if (rv == -1)
1792                                 goto err;
1793                         else if (rv == 0)
1794                                 {
1795                                 al = SSL_AD_DECODE_ERROR;
1796                                 goto f_err;
1797                                 }
1798 #ifdef SSL_DEBUG
1799 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1800 #endif
1801                         p += 2;
1802                         n -= 2;
1803                         }
1804                 else
1805                         md = EVP_sha1();
1806
1807                 n2s(p,i);
1808                 n-=2;
1809                 j=EVP_PKEY_size(pkey);
1810
1811                 if ((i != n) || (n > j) || (n <= 0))
1812                         {
1813                         /* wrong packet length */
1814                         al=SSL_AD_DECODE_ERROR;
1815                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1816                         goto f_err;
1817                         }
1818
1819 #ifndef OPENSSL_NO_RSA
1820                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1821                         {
1822                         int num;
1823
1824                         j=0;
1825                         q=md_buf;
1826                         for (num=2; num > 0; num--)
1827                                 {
1828                                 EVP_MD_CTX_set_flags(&md_ctx,
1829                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1830                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1831                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1832                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1833                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1834                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1835                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1836                                 q+=i;
1837                                 j+=i;
1838                                 }
1839                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1840                                                                 pkey->pkey.rsa);
1841                         if (i < 0)
1842                                 {
1843                                 al=SSL_AD_DECRYPT_ERROR;
1844                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1845                                 goto f_err;
1846                                 }
1847                         if (i == 0)
1848                                 {
1849                                 /* bad signature */
1850                                 al=SSL_AD_DECRYPT_ERROR;
1851                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1852                                 goto f_err;
1853                                 }
1854                         }
1855                 else
1856 #endif
1857                         {
1858                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1859                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1860                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1861                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1862                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1863                                 {
1864                                 /* bad signature */
1865                                 al=SSL_AD_DECRYPT_ERROR;
1866                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1867                                 goto f_err;
1868                                 }
1869                         }
1870                 }
1871         else
1872                 {
1873                 /* aNULL or kPSK do not need public keys */
1874                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1875                         {
1876                         /* Might be wrong key type, check it */
1877                         if (ssl3_check_cert_and_algorithm(s))
1878                                 /* Otherwise this shouldn't happen */
1879                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1880                         goto err;
1881                         }
1882                 /* still data left over */
1883                 if (n != 0)
1884                         {
1885                         al=SSL_AD_DECODE_ERROR;
1886                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1887                         goto f_err;
1888                         }
1889                 }
1890         EVP_PKEY_free(pkey);
1891         EVP_MD_CTX_cleanup(&md_ctx);
1892         return(1);
1893 f_err:
1894         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1895 err:
1896         EVP_PKEY_free(pkey);
1897 #ifndef OPENSSL_NO_RSA
1898         if (rsa != NULL)
1899                 RSA_free(rsa);
1900 #endif
1901 #ifndef OPENSSL_NO_DH
1902         if (dh != NULL)
1903                 DH_free(dh);
1904 #endif
1905 #ifndef OPENSSL_NO_ECDH
1906         BN_CTX_free(bn_ctx);
1907         EC_POINT_free(srvr_ecpoint);
1908         if (ecdh != NULL)
1909                 EC_KEY_free(ecdh);
1910 #endif
1911         EVP_MD_CTX_cleanup(&md_ctx);
1912         return(-1);
1913         }
1914
1915 int ssl3_get_certificate_request(SSL *s)
1916         {
1917         int ok,ret=0;
1918         unsigned long n,nc,l;
1919         unsigned int llen, ctype_num,i;
1920         X509_NAME *xn=NULL;
1921         const unsigned char *p,*q;
1922         unsigned char *d;
1923         STACK_OF(X509_NAME) *ca_sk=NULL;
1924
1925         n=s->method->ssl_get_message(s,
1926                 SSL3_ST_CR_CERT_REQ_A,
1927                 SSL3_ST_CR_CERT_REQ_B,
1928                 -1,
1929                 s->max_cert_list,
1930                 &ok);
1931
1932         if (!ok) return((int)n);
1933
1934         s->s3->tmp.cert_req=0;
1935
1936         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1937                 {
1938                 s->s3->tmp.reuse_message=1;
1939                 /* If we get here we don't need any cached handshake records
1940                  * as we wont be doing client auth.
1941                  */
1942                 if (s->s3->handshake_buffer)
1943                         {
1944                         if (!ssl3_digest_cached_records(s))
1945                                 goto err;
1946                         }
1947                 return(1);
1948                 }
1949
1950         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1951                 {
1952                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1953                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1954                 goto err;
1955                 }
1956
1957         /* TLS does not like anon-DH with client cert */
1958         if (s->version > SSL3_VERSION)
1959                 {
1960                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1961                         {
1962                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1963                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1964                         goto err;
1965                         }
1966                 }
1967
1968         p=d=(unsigned char *)s->init_msg;
1969
1970         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1971                 {
1972                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1973                 goto err;
1974                 }
1975
1976         /* get the certificate types */
1977         ctype_num= *(p++);
1978         if (s->cert->ctypes)
1979                 {
1980                 OPENSSL_free(s->cert->ctypes);
1981                 s->cert->ctypes = NULL;
1982                 }
1983         if (ctype_num > SSL3_CT_NUMBER)
1984                 {
1985                 /* If we exceed static buffer copy all to cert structure */
1986                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
1987                 memcpy(s->cert->ctypes, p, ctype_num);
1988                 s->cert->ctype_num = (size_t)ctype_num;
1989                 ctype_num=SSL3_CT_NUMBER;
1990                 }
1991         for (i=0; i<ctype_num; i++)
1992                 s->s3->tmp.ctype[i]= p[i];
1993         p+=p[-1];
1994         if (SSL_USE_SIGALGS(s))
1995                 {
1996                 n2s(p, llen);
1997                 /* Check we have enough room for signature algorithms and
1998                  * following length value.
1999                  */
2000                 if ((unsigned long)(p - d + llen + 2) > n)
2001                         {
2002                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2003                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2004                         goto err;
2005                         }
2006                 /* Clear certificate digests and validity flags */
2007                 for (i = 0; i < SSL_PKEY_NUM; i++)
2008                         {
2009                         s->cert->pkeys[i].digest = NULL;
2010                         s->cert->pkeys[i].valid_flags = 0;
2011                         }
2012                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2013                         {
2014                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2015                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2016                         goto err;
2017                         }
2018                 p += llen;
2019                 }
2020
2021         /* get the CA RDNs */
2022         n2s(p,llen);
2023 #if 0
2024 {
2025 FILE *out;
2026 out=fopen("/tmp/vsign.der","w");
2027 fwrite(p,1,llen,out);
2028 fclose(out);
2029 }
2030 #endif
2031
2032         if ((unsigned long)(p - d + llen) != n)
2033                 {
2034                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2035                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2036                 goto err;
2037                 }
2038
2039         for (nc=0; nc<llen; )
2040                 {
2041                 n2s(p,l);
2042                 if ((l+nc+2) > llen)
2043                         {
2044                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2045                                 goto cont; /* netscape bugs */
2046                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2047                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2048                         goto err;
2049                         }
2050
2051                 q=p;
2052
2053                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2054                         {
2055                         /* If netscape tolerance is on, ignore errors */
2056                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2057                                 goto cont;
2058                         else
2059                                 {
2060                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2061                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2062                                 goto err;
2063                                 }
2064                         }
2065
2066                 if (q != (p+l))
2067                         {
2068                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2069                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2070                         goto err;
2071                         }
2072                 if (!sk_X509_NAME_push(ca_sk,xn))
2073                         {
2074                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2075                         goto err;
2076                         }
2077
2078                 p+=l;
2079                 nc+=l+2;
2080                 }
2081
2082         if (0)
2083                 {
2084 cont:
2085                 ERR_clear_error();
2086                 }
2087
2088         /* we should setup a certificate to return.... */
2089         s->s3->tmp.cert_req=1;
2090         s->s3->tmp.ctype_num=ctype_num;
2091         if (s->s3->tmp.ca_names != NULL)
2092                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2093         s->s3->tmp.ca_names=ca_sk;
2094         ca_sk=NULL;
2095
2096         ret=1;
2097 err:
2098         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2099         return(ret);
2100         }
2101
2102 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2103         {
2104         return(X509_NAME_cmp(*a,*b));
2105         }
2106 #ifndef OPENSSL_NO_TLSEXT
2107 int ssl3_get_new_session_ticket(SSL *s)
2108         {
2109         int ok,al,ret=0, ticklen;
2110         long n;
2111         const unsigned char *p;
2112         unsigned char *d;
2113
2114         n=s->method->ssl_get_message(s,
2115                 SSL3_ST_CR_SESSION_TICKET_A,
2116                 SSL3_ST_CR_SESSION_TICKET_B,
2117                 -1,
2118                 16384,
2119                 &ok);
2120
2121         if (!ok)
2122                 return((int)n);
2123
2124         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2125                 {
2126                 s->s3->tmp.reuse_message=1;
2127                 return(1);
2128                 }
2129         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2130                 {
2131                 al=SSL_AD_UNEXPECTED_MESSAGE;
2132                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2133                 goto f_err;
2134                 }
2135         if (n < 6)
2136                 {
2137                 /* need at least ticket_lifetime_hint + ticket length */
2138                 al = SSL_AD_DECODE_ERROR;
2139                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2140                 goto f_err;
2141                 }
2142
2143         p=d=(unsigned char *)s->init_msg;
2144         n2l(p, s->session->tlsext_tick_lifetime_hint);
2145         n2s(p, ticklen);
2146         /* ticket_lifetime_hint + ticket_length + ticket */
2147         if (ticklen + 6 != n)
2148                 {
2149                 al = SSL_AD_DECODE_ERROR;
2150                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2151                 goto f_err;
2152                 }
2153         if (s->session->tlsext_tick)
2154                 {
2155                 OPENSSL_free(s->session->tlsext_tick);
2156                 s->session->tlsext_ticklen = 0;
2157                 }
2158         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2159         if (!s->session->tlsext_tick)
2160                 {
2161                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2162                 goto err;
2163                 }
2164         memcpy(s->session->tlsext_tick, p, ticklen);
2165         s->session->tlsext_ticklen = ticklen;
2166         /* There are two ways to detect a resumed ticket sesion.
2167          * One is to set an appropriate session ID and then the server
2168          * must return a match in ServerHello. This allows the normal
2169          * client session ID matching to work and we know much
2170          * earlier that the ticket has been accepted.
2171          *
2172          * The other way is to set zero length session ID when the
2173          * ticket is presented and rely on the handshake to determine
2174          * session resumption.
2175          *
2176          * We choose the former approach because this fits in with
2177          * assumptions elsewhere in OpenSSL. The session ID is set
2178          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2179          * ticket.
2180          */
2181         EVP_Digest(p, ticklen,
2182                         s->session->session_id, &s->session->session_id_length,
2183 #ifndef OPENSSL_NO_SHA256
2184                                                         EVP_sha256(), NULL);
2185 #else
2186                                                         EVP_sha1(), NULL);
2187 #endif
2188         ret=1;
2189         return(ret);
2190 f_err:
2191         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2192 err:
2193         return(-1);
2194         }
2195
2196 int ssl3_get_cert_status(SSL *s)
2197         {
2198         int ok, al;
2199         unsigned long resplen,n;
2200         const unsigned char *p;
2201
2202         n=s->method->ssl_get_message(s,
2203                 SSL3_ST_CR_CERT_STATUS_A,
2204                 SSL3_ST_CR_CERT_STATUS_B,
2205                 SSL3_MT_CERTIFICATE_STATUS,
2206                 16384,
2207                 &ok);
2208
2209         if (!ok) return((int)n);
2210         if (n < 4)
2211                 {
2212                 /* need at least status type + length */
2213                 al = SSL_AD_DECODE_ERROR;
2214                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2215                 goto f_err;
2216                 }
2217         p = (unsigned char *)s->init_msg;
2218         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2219                 {
2220                 al = SSL_AD_DECODE_ERROR;
2221                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2222                 goto f_err;
2223                 }
2224         n2l3(p, resplen);
2225         if (resplen + 4 != n)
2226                 {
2227                 al = SSL_AD_DECODE_ERROR;
2228                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2229                 goto f_err;
2230                 }
2231         if (s->tlsext_ocsp_resp)
2232                 OPENSSL_free(s->tlsext_ocsp_resp);
2233         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2234         if (!s->tlsext_ocsp_resp)
2235                 {
2236                 al = SSL_AD_INTERNAL_ERROR;
2237                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2238                 goto f_err;
2239                 }
2240         s->tlsext_ocsp_resplen = resplen;
2241         if (s->ctx->tlsext_status_cb)
2242                 {
2243                 int ret;
2244                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2245                 if (ret == 0)
2246                         {
2247                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2248                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2249                         goto f_err;
2250                         }
2251                 if (ret < 0)
2252                         {
2253                         al = SSL_AD_INTERNAL_ERROR;
2254                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2255                         goto f_err;
2256                         }
2257                 }
2258         return 1;
2259 f_err:
2260         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2261         return(-1);
2262         }
2263 #endif
2264
2265 int ssl3_get_server_done(SSL *s)
2266         {
2267         int ok,ret=0;
2268         long n;
2269
2270         n=s->method->ssl_get_message(s,
2271                 SSL3_ST_CR_SRVR_DONE_A,
2272                 SSL3_ST_CR_SRVR_DONE_B,
2273                 SSL3_MT_SERVER_DONE,
2274                 30, /* should be very small, like 0 :-) */
2275                 &ok);
2276
2277         if (!ok) return((int)n);
2278         if (n > 0)
2279                 {
2280                 /* should contain no data */
2281                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2282                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2283                 return -1;
2284                 }
2285         ret=1;
2286         return(ret);
2287         }
2288
2289
2290 int ssl3_send_client_key_exchange(SSL *s)
2291         {
2292         unsigned char *p;
2293         int n;
2294         unsigned long alg_k;
2295 #ifndef OPENSSL_NO_RSA
2296         unsigned char *q;
2297         EVP_PKEY *pkey=NULL;
2298 #endif
2299 #ifndef OPENSSL_NO_KRB5
2300         KSSL_ERR kssl_err;
2301 #endif /* OPENSSL_NO_KRB5 */
2302 #ifndef OPENSSL_NO_ECDH
2303         EC_KEY *clnt_ecdh = NULL;
2304         const EC_POINT *srvr_ecpoint = NULL;
2305         EVP_PKEY *srvr_pub_pkey = NULL;
2306         unsigned char *encodedPoint = NULL;
2307         int encoded_pt_len = 0;
2308         BN_CTX * bn_ctx = NULL;
2309 #endif
2310
2311         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2312                 {
2313                 p = ssl_handshake_start(s);
2314
2315                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2316
2317                 /* Fool emacs indentation */
2318                 if (0) {}
2319 #ifndef OPENSSL_NO_RSA
2320                 else if (alg_k & SSL_kRSA)
2321                         {
2322                         RSA *rsa;
2323                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2324
2325                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2326                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2327                         else
2328                                 {
2329                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2330                                 if ((pkey == NULL) ||
2331                                         (pkey->type != EVP_PKEY_RSA) ||
2332                                         (pkey->pkey.rsa == NULL))
2333                                         {
2334                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2335                                         goto err;
2336                                         }
2337                                 rsa=pkey->pkey.rsa;
2338                                 EVP_PKEY_free(pkey);
2339                                 }
2340
2341                         tmp_buf[0]=s->client_version>>8;
2342                         tmp_buf[1]=s->client_version&0xff;
2343                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2344                                         goto err;
2345
2346                         s->session->master_key_length=sizeof tmp_buf;
2347
2348                         q=p;
2349                         /* Fix buf for TLS and beyond */
2350                         if (s->version > SSL3_VERSION)
2351                                 p+=2;
2352                         n=RSA_public_encrypt(sizeof tmp_buf,
2353                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2354 #ifdef PKCS1_CHECK
2355                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2356                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2357 #endif
2358                         if (n <= 0)
2359                                 {
2360                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2361                                 goto err;
2362                                 }
2363
2364                         /* Fix buf for TLS and beyond */
2365                         if (s->version > SSL3_VERSION)
2366                                 {
2367                                 s2n(n,q);
2368                                 n+=2;
2369                                 }
2370
2371                         s->session->master_key_length=
2372                                 s->method->ssl3_enc->generate_master_secret(s,
2373                                         s->session->master_key,
2374                                         tmp_buf,sizeof tmp_buf);
2375                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2376                         }
2377 #endif
2378 #ifndef OPENSSL_NO_KRB5
2379                 else if (alg_k & SSL_kKRB5)
2380                         {
2381                         krb5_error_code krb5rc;
2382                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2383                         /*  krb5_data   krb5_ap_req;  */
2384                         krb5_data       *enc_ticket;
2385                         krb5_data       authenticator, *authp = NULL;
2386                         EVP_CIPHER_CTX  ciph_ctx;
2387                         const EVP_CIPHER *enc = NULL;
2388                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2389                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2390                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2391                                                 + EVP_MAX_IV_LENGTH];
2392                         int             padl, outl = sizeof(epms);
2393
2394                         EVP_CIPHER_CTX_init(&ciph_ctx);
2395
2396 #ifdef KSSL_DEBUG
2397                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2398                                 alg_k, SSL_kKRB5);
2399 #endif  /* KSSL_DEBUG */
2400
2401                         authp = NULL;
2402 #ifdef KRB5SENDAUTH
2403                         if (KRB5SENDAUTH)  authp = &authenticator;
2404 #endif  /* KRB5SENDAUTH */
2405
2406                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2407                                 &kssl_err);
2408                         enc = kssl_map_enc(kssl_ctx->enctype);
2409                         if (enc == NULL)
2410                             goto err;
2411 #ifdef KSSL_DEBUG
2412                         {
2413                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2414                         if (krb5rc && kssl_err.text)
2415                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2416                         }
2417 #endif  /* KSSL_DEBUG */
2418
2419                         if (krb5rc)
2420                                 {
2421                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2422                                                 SSL_AD_HANDSHAKE_FAILURE);
2423                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2424                                                 kssl_err.reason);
2425                                 goto err;
2426                                 }
2427
2428                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2429                         **  in place of RFC 2712 KerberosWrapper, as in:
2430                         **
2431                         **  Send ticket (copy to *p, set n = length)
2432                         **  n = krb5_ap_req.length;
2433                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2434                         **  if (krb5_ap_req.data)
2435                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2436                         **
2437                         **  Now using real RFC 2712 KerberosWrapper
2438                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2439                         **  Note: 2712 "opaque" types are here replaced
2440                         **  with a 2-byte length followed by the value.
2441                         **  Example:
2442                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2443                         **  Where "xx xx" = length bytes.  Shown here with
2444                         **  optional authenticator omitted.
2445                         */
2446
2447                         /*  KerberosWrapper.Ticket              */
2448                         s2n(enc_ticket->length,p);
2449                         memcpy(p, enc_ticket->data, enc_ticket->length);
2450                         p+= enc_ticket->length;
2451                         n = enc_ticket->length + 2;
2452
2453                         /*  KerberosWrapper.Authenticator       */
2454                         if (authp  &&  authp->length)
2455                                 {
2456                                 s2n(authp->length,p);
2457                                 memcpy(p, authp->data, authp->length);
2458                                 p+= authp->length;
2459                                 n+= authp->length + 2;
2460
2461                                 free(authp->data);
2462                                 authp->data = NULL;
2463                                 authp->length = 0;
2464                                 }
2465                         else
2466                                 {
2467                                 s2n(0,p);/*  null authenticator length  */
2468                                 n+=2;
2469                                 }
2470
2471                             tmp_buf[0]=s->client_version>>8;
2472                             tmp_buf[1]=s->client_version&0xff;
2473                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2474                                 goto err;
2475
2476                         /*  20010420 VRS.  Tried it this way; failed.
2477                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2478                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2479                         **                              kssl_ctx->length);
2480                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2481                         */
2482
2483                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2484                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2485                                 kssl_ctx->key,iv);
2486                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2487                                 sizeof tmp_buf);
2488                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2489                         outl += padl;
2490                         if (outl > (int)sizeof epms)
2491                                 {
2492                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2493                                 goto err;
2494                                 }
2495                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2496
2497                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2498                         s2n(outl,p);
2499                         memcpy(p, epms, outl);
2500                         p+=outl;
2501                         n+=outl + 2;
2502
2503                         s->session->master_key_length=
2504                                 s->method->ssl3_enc->generate_master_secret(s,
2505                                         s->session->master_key,
2506                                         tmp_buf, sizeof tmp_buf);
2507
2508                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2509                         OPENSSL_cleanse(epms, outl);
2510                         }
2511 #endif
2512 #ifndef OPENSSL_NO_DH
2513                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2514                         {
2515                         DH *dh_srvr,*dh_clnt;
2516                         SESS_CERT *scert = s->session->sess_cert;
2517
2518                         if (scert == NULL)
2519                                 {
2520                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2521                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2522                                 goto err;
2523                                 }
2524
2525                         if (scert->peer_dh_tmp != NULL)
2526                                 dh_srvr=scert->peer_dh_tmp;
2527                         else
2528                                 {
2529                                 /* we get them from the cert */
2530                                 int idx = scert->peer_cert_type;
2531                                 EVP_PKEY *spkey = NULL;
2532                                 dh_srvr = NULL;
2533                                 if (idx >= 0)
2534                                         spkey = X509_get_pubkey(
2535                                                 scert->peer_pkeys[idx].x509);
2536                                 if (spkey)
2537                                         {
2538                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2539                                         EVP_PKEY_free(spkey);
2540                                         }
2541                                 if (dh_srvr == NULL)
2542                                         {
2543                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2544                                             ERR_R_INTERNAL_ERROR);
2545                                         goto err;
2546                                         }
2547                                 }
2548                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2549                                 {
2550                                 /* Use client certificate key */
2551                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2552                                 dh_clnt = NULL;
2553                                 if (clkey)
2554                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2555                                 if (dh_clnt == NULL)
2556                                         {
2557                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2558                                             ERR_R_INTERNAL_ERROR);
2559                                         goto err;
2560                                         }
2561                                 }
2562                         else
2563                                 {
2564                                 /* generate a new random key */
2565                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2566                                         {
2567                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2568                                         goto err;
2569                                         }
2570                                 if (!DH_generate_key(dh_clnt))
2571                                         {
2572                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2573                                         DH_free(dh_clnt);
2574                                         goto err;
2575                                         }
2576                                 }
2577
2578                         /* use the 'p' output buffer for the DH key, but
2579                          * make sure to clear it out afterwards */
2580
2581                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2582                         if (scert->peer_dh_tmp == NULL)
2583                                 DH_free(dh_srvr);
2584
2585                         if (n <= 0)
2586                                 {
2587                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2588                                 DH_free(dh_clnt);
2589                                 goto err;
2590                                 }
2591
2592                         /* generate master key from the result */
2593                         s->session->master_key_length=
2594                                 s->method->ssl3_enc->generate_master_secret(s,
2595                                         s->session->master_key,p,n);
2596                         /* clean up */
2597                         memset(p,0,n);
2598
2599                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2600                                 n = 0;
2601                         else
2602                                 {
2603                                 /* send off the data */
2604                                 n=BN_num_bytes(dh_clnt->pub_key);
2605                                 s2n(n,p);
2606                                 BN_bn2bin(dh_clnt->pub_key,p);
2607                                 n+=2;
2608                                 }
2609
2610                         DH_free(dh_clnt);
2611
2612                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2613                         }
2614 #endif
2615
2616 #ifndef OPENSSL_NO_ECDH
2617                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2618                         {
2619                         const EC_GROUP *srvr_group = NULL;
2620                         EC_KEY *tkey;
2621                         int ecdh_clnt_cert = 0;
2622                         int field_size = 0;
2623
2624                         /* Did we send out the client's
2625                          * ECDH share for use in premaster
2626                          * computation as part of client certificate?
2627                          * If so, set ecdh_clnt_cert to 1.
2628                          */
2629                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2630                                 {
2631                                 /* XXX: For now, we do not support client
2632                                  * authentication using ECDH certificates.
2633                                  * To add such support, one needs to add
2634                                  * code that checks for appropriate
2635                                  * conditions and sets ecdh_clnt_cert to 1.
2636                                  * For example, the cert have an ECC
2637                                  * key on the same curve as the server's
2638                                  * and the key should be authorized for
2639                                  * key agreement.
2640                                  *
2641                                  * One also needs to add code in ssl3_connect
2642                                  * to skip sending the certificate verify
2643                                  * message.
2644                                  *
2645                                  * if ((s->cert->key->privatekey != NULL) &&
2646                                  *     (s->cert->key->privatekey->type ==
2647                                  *      EVP_PKEY_EC) && ...)
2648                                  * ecdh_clnt_cert = 1;
2649                                  */
2650                                 }
2651
2652                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2653                                 {
2654                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2655                                 }
2656                         else
2657                                 {
2658                                 /* Get the Server Public Key from Cert */
2659                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2660                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2661                                 if ((srvr_pub_pkey == NULL) ||
2662                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2663                                     (srvr_pub_pkey->pkey.ec == NULL))
2664                                         {
2665                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2666                                             ERR_R_INTERNAL_ERROR);
2667                                         goto err;
2668                                         }
2669
2670                                 tkey = srvr_pub_pkey->pkey.ec;
2671                                 }
2672
2673                         srvr_group   = EC_KEY_get0_group(tkey);
2674                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2675
2676                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2677                                 {
2678                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2679                                     ERR_R_INTERNAL_ERROR);
2680                                 goto err;
2681                                 }
2682
2683                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2686                                 goto err;
2687                                 }
2688
2689                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2690                                 {
2691                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2692                                 goto err;
2693                                 }
2694                         if (ecdh_clnt_cert)
2695                                 {
2696                                 /* Reuse key info from our certificate
2697                                  * We only need our private key to perform
2698                                  * the ECDH computation.
2699                                  */
2700                                 const BIGNUM *priv_key;
2701                                 tkey = s->cert->key->privatekey->pkey.ec;
2702                                 priv_key = EC_KEY_get0_private_key(tkey);
2703                                 if (priv_key == NULL)
2704                                         {
2705                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2706                                         goto err;
2707                                         }
2708                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2709                                         {
2710                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2711                                         goto err;
2712                                         }
2713                                 }
2714                         else
2715                                 {
2716                                 /* Generate a new ECDH key pair */
2717                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2718                                         {
2719                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2720                                         goto err;
2721                                         }
2722                                 }
2723
2724                         /* use the 'p' output buffer for the ECDH key, but
2725                          * make sure to clear it out afterwards
2726                          */
2727
2728                         field_size = EC_GROUP_get_degree(srvr_group);
2729                         if (field_size <= 0)
2730                                 {
2731                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2732                                        ERR_R_ECDH_LIB);
2733                                 goto err;
2734                                 }
2735                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2736                         if (n <= 0)
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2739                                        ERR_R_ECDH_LIB);
2740                                 goto err;
2741                                 }
2742
2743                         /* generate master key from the result */
2744                         s->session->master_key_length = s->method->ssl3_enc \
2745                             -> generate_master_secret(s,
2746                                 s->session->master_key,
2747                                 p, n);
2748
2749                         memset(p, 0, n); /* clean up */
2750
2751                         if (ecdh_clnt_cert)
2752                                 {
2753                                 /* Send empty client key exch message */
2754                                 n = 0;
2755                                 }
2756                         else
2757                                 {
2758                                 /* First check the size of encoding and
2759                                  * allocate memory accordingly.
2760                                  */
2761                                 encoded_pt_len =
2762                                     EC_POINT_point2oct(srvr_group,
2763                                         EC_KEY_get0_public_key(clnt_ecdh),
2764                                         POINT_CONVERSION_UNCOMPRESSED,
2765                                         NULL, 0, NULL);
2766
2767                                 encodedPoint = (unsigned char *)
2768                                     OPENSSL_malloc(encoded_pt_len *
2769                                         sizeof(unsigned char));
2770                                 bn_ctx = BN_CTX_new();
2771                                 if ((encodedPoint == NULL) ||
2772                                     (bn_ctx == NULL))
2773                                         {
2774                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2775                                         goto err;
2776                                         }
2777
2778                                 /* Encode the public key */
2779                                 n = EC_POINT_point2oct(srvr_group,
2780                                     EC_KEY_get0_public_key(clnt_ecdh),
2781                                     POINT_CONVERSION_UNCOMPRESSED,
2782                                     encodedPoint, encoded_pt_len, bn_ctx);
2783
2784                                 *p = n; /* length of encoded point */
2785                                 /* Encoded point will be copied here */
2786                                 p += 1;
2787                                 /* copy the point */
2788                                 memcpy((unsigned char *)p, encodedPoint, n);
2789                                 /* increment n to account for length field */
2790                                 n += 1;
2791                                 }
2792
2793                         /* Free allocated memory */
2794                         BN_CTX_free(bn_ctx);
2795                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2796                         if (clnt_ecdh != NULL)
2797                                  EC_KEY_free(clnt_ecdh);
2798                         EVP_PKEY_free(srvr_pub_pkey);
2799                         }
2800 #endif /* !OPENSSL_NO_ECDH */
2801                 else if (alg_k & SSL_kGOST)
2802                         {
2803                         /* GOST key exchange message creation */
2804                         EVP_PKEY_CTX *pkey_ctx;
2805                         X509 *peer_cert;
2806                         size_t msglen;
2807                         unsigned int md_len;
2808                         int keytype;
2809                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2810                         EVP_MD_CTX *ukm_hash;
2811                         EVP_PKEY *pub_key;
2812
2813                         /* Get server sertificate PKEY and create ctx from it */
2814                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2815                         if (!peer_cert)
2816                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2817                         if (!peer_cert)         {
2818                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2819                                         goto err;
2820                                 }
2821
2822                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2823                         /* If we have send a certificate, and certificate key
2824
2825                          * parameters match those of server certificate, use
2826                          * certificate key for key exchange
2827                          */
2828
2829                          /* Otherwise, generate ephemeral key pair */
2830
2831                         EVP_PKEY_encrypt_init(pkey_ctx);
2832                           /* Generate session key */
2833                     RAND_bytes(premaster_secret,32);
2834                         /* If we have client certificate, use its secret as peer key */
2835                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2836                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2837                                         /* If there was an error - just ignore it. Ephemeral key
2838                                         * would be used
2839                                         */
2840                                         ERR_clear_error();
2841                                 }
2842                         }
2843                         /* Compute shared IV and store it in algorithm-specific
2844                          * context data */
2845                         ukm_hash = EVP_MD_CTX_create();
2846                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2847                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2848                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2849                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2850                         EVP_MD_CTX_destroy(ukm_hash);
2851                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2852                                 8,shared_ukm)<0) {
2853                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2854                                                 SSL_R_LIBRARY_BUG);
2855                                         goto err;
2856                                 }
2857                         /* Make GOST keytransport blob message */
2858                         /*Encapsulate it into sequence */
2859                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2860                         msglen=255;
2861                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2862                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2863                                         SSL_R_LIBRARY_BUG);
2864                                 goto err;
2865                         }
2866                         if (msglen >= 0x80)
2867                                 {
2868                                 *(p++)=0x81;
2869                                 *(p++)= msglen & 0xff;
2870                                 n=msglen+3;
2871                                 }
2872                         else
2873                                 {
2874                                 *(p++)= msglen & 0xff;
2875                                 n=msglen+2;
2876                                 }
2877                         memcpy(p, tmp, msglen);
2878                         /* Check if pubkey from client certificate was used */
2879                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2880                                 {
2881                                 /* Set flag "skip certificate verify" */
2882                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2883                                 }
2884                         EVP_PKEY_CTX_free(pkey_ctx);
2885                         s->session->master_key_length=
2886                                 s->method->ssl3_enc->generate_master_secret(s,
2887                                         s->session->master_key,premaster_secret,32);
2888                         EVP_PKEY_free(pub_key);
2889
2890                         }
2891 #ifndef OPENSSL_NO_SRP
2892                 else if (alg_k & SSL_kSRP)
2893                         {
2894                         if (s->srp_ctx.A != NULL)
2895                                 {
2896                                 /* send off the data */
2897                                 n=BN_num_bytes(s->srp_ctx.A);
2898                                 s2n(n,p);
2899                                 BN_bn2bin(s->srp_ctx.A,p);
2900                                 n+=2;
2901                                 }
2902                         else
2903                                 {
2904                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2905                                 goto err;
2906                                 }
2907                         if (s->session->srp_username != NULL)
2908                                 OPENSSL_free(s->session->srp_username);
2909                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2910                         if (s->session->srp_username == NULL)
2911                                 {
2912                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2913                                         ERR_R_MALLOC_FAILURE);
2914                                 goto err;
2915                                 }
2916
2917                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2918                                 {
2919                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2920                                 goto err;
2921                                 }
2922                         }
2923 #endif
2924 #ifndef OPENSSL_NO_PSK
2925                 else if (alg_k & SSL_kPSK)
2926                         {
2927                         char identity[PSK_MAX_IDENTITY_LEN];
2928                         unsigned char *t = NULL;
2929                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2930                         unsigned int pre_ms_len = 0, psk_len = 0;
2931                         int psk_err = 1;
2932
2933                         n = 0;
2934                         if (s->psk_client_callback == NULL)
2935                                 {
2936                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2937                                         SSL_R_PSK_NO_CLIENT_CB);
2938                                 goto err;
2939                                 }
2940
2941                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2942                                 identity, PSK_MAX_IDENTITY_LEN,
2943                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2944                         if (psk_len > PSK_MAX_PSK_LEN)
2945                                 {
2946                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2947                                         ERR_R_INTERNAL_ERROR);
2948                                 goto psk_err;
2949                                 }
2950                         else if (psk_len == 0)
2951                                 {
2952                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2953                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2954                                 goto psk_err;
2955                                 }
2956
2957                         /* create PSK pre_master_secret */
2958                         pre_ms_len = 2+psk_len+2+psk_len;
2959                         t = psk_or_pre_ms;
2960                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2961                         s2n(psk_len, t);
2962                         memset(t, 0, psk_len);
2963                         t+=psk_len;
2964                         s2n(psk_len, t);
2965
2966                         if (s->session->psk_identity_hint != NULL)
2967                                 OPENSSL_free(s->session->psk_identity_hint);
2968                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2969                         if (s->ctx->psk_identity_hint != NULL &&
2970                                 s->session->psk_identity_hint == NULL)
2971                                 {
2972                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2973                                         ERR_R_MALLOC_FAILURE);
2974                                 goto psk_err;
2975                                 }
2976
2977                         if (s->session->psk_identity != NULL)
2978                                 OPENSSL_free(s->session->psk_identity);
2979                         s->session->psk_identity = BUF_strdup(identity);
2980                         if (s->session->psk_identity == NULL)
2981                                 {
2982                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2983                                         ERR_R_MALLOC_FAILURE);
2984                                 goto psk_err;
2985                                 }
2986
2987                         s->session->master_key_length =
2988                                 s->method->ssl3_enc->generate_master_secret(s,
2989                                         s->session->master_key,
2990                                         psk_or_pre_ms, pre_ms_len);
2991                         n = strlen(identity);
2992                         s2n(n, p);
2993                         memcpy(p, identity, n);
2994                         n+=2;
2995                         psk_err = 0;
2996                 psk_err:
2997                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2998                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2999                         if (psk_err != 0)
3000                                 {
3001                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3002                                 goto err;
3003                                 }
3004                         }
3005 #endif
3006                 else
3007                         {
3008                         ssl3_send_alert(s, SSL3_AL_FATAL,
3009                             SSL_AD_HANDSHAKE_FAILURE);
3010                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3011                             ERR_R_INTERNAL_ERROR);
3012                         goto err;
3013                         }
3014
3015                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3016                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3017                 }
3018
3019         /* SSL3_ST_CW_KEY_EXCH_B */
3020         return ssl_do_write(s);
3021 err:
3022 #ifndef OPENSSL_NO_ECDH
3023         BN_CTX_free(bn_ctx);
3024         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3025         if (clnt_ecdh != NULL)
3026                 EC_KEY_free(clnt_ecdh);
3027         EVP_PKEY_free(srvr_pub_pkey);
3028 #endif
3029         return(-1);
3030         }
3031
3032 int ssl3_send_client_verify(SSL *s)
3033         {
3034         unsigned char *p;
3035         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3036         EVP_PKEY *pkey;
3037         EVP_PKEY_CTX *pctx=NULL;
3038         EVP_MD_CTX mctx;
3039         unsigned u=0;
3040         unsigned long n;
3041         int j;
3042
3043         EVP_MD_CTX_init(&mctx);
3044
3045         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3046                 {
3047                 p= ssl_handshake_start(s);
3048                 pkey=s->cert->key->privatekey;
3049 /* Create context from key and test if sha1 is allowed as digest */
3050                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3051                 EVP_PKEY_sign_init(pctx);
3052                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3053                         {
3054                         if (!SSL_USE_SIGALGS(s))
3055                                 s->method->ssl3_enc->cert_verify_mac(s,
3056                                                 NID_sha1,
3057                                                 &(data[MD5_DIGEST_LENGTH]));
3058                         }
3059                 else
3060                         {
3061                         ERR_clear_error();
3062                         }
3063                 /* For TLS v1.2 send signature algorithm and signature
3064                  * using agreed digest and cached handshake records.
3065                  */
3066                 if (SSL_USE_SIGALGS(s))
3067                         {
3068                         long hdatalen = 0;
3069                         void *hdata;
3070                         const EVP_MD *md = s->cert->key->digest;
3071                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3072                                                                 &hdata);
3073                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3074                                 {
3075                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3076                                                 ERR_R_INTERNAL_ERROR);
3077                                 goto err;
3078                                 }
3079                         p += 2;
3080 #ifdef SSL_DEBUG
3081                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3082                                                         EVP_MD_name(md));
3083 #endif
3084                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3085                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3086                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3087                                 {
3088                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3089                                                 ERR_R_EVP_LIB);
3090                                 goto err;
3091                                 }
3092                         s2n(u,p);
3093                         n = u + 4;
3094                         if (!ssl3_digest_cached_records(s))
3095                                 goto err;
3096                         }
3097                 else
3098 #ifndef OPENSSL_NO_RSA
3099                 if (pkey->type == EVP_PKEY_RSA)
3100                         {
3101                         s->method->ssl3_enc->cert_verify_mac(s,
3102                                 NID_md5,
3103                                 &(data[0]));
3104                         if (RSA_sign(NID_md5_sha1, data,
3105                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3106                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3107                                 {
3108                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3109                                 goto err;
3110                                 }
3111                         s2n(u,p);
3112                         n=u+2;
3113                         }
3114                 else
3115 #endif
3116 #ifndef OPENSSL_NO_DSA
3117                         if (pkey->type == EVP_PKEY_DSA)
3118                         {
3119                         if (!DSA_sign(pkey->save_type,
3120                                 &(data[MD5_DIGEST_LENGTH]),
3121                                 SHA_DIGEST_LENGTH,&(p[2]),
3122                                 (unsigned int *)&j,pkey->pkey.dsa))
3123                                 {
3124                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3125                                 goto err;
3126                                 }
3127                         s2n(j,p);
3128                         n=j+2;
3129                         }
3130                 else
3131 #endif
3132 #ifndef OPENSSL_NO_ECDSA
3133                         if (pkey->type == EVP_PKEY_EC)
3134                         {
3135                         if (!ECDSA_sign(pkey->save_type,
3136                                 &(data[MD5_DIGEST_LENGTH]),
3137                                 SHA_DIGEST_LENGTH,&(p[2]),
3138                                 (unsigned int *)&j,pkey->pkey.ec))
3139                                 {
3140                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3141                                     ERR_R_ECDSA_LIB);
3142                                 goto err;
3143                                 }
3144                         s2n(j,p);
3145                         n=j+2;
3146                         }
3147                 else
3148 #endif
3149                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3150                 {
3151                 unsigned char signbuf[64];
3152                 int i;
3153                 size_t sigsize=64;
3154                 s->method->ssl3_enc->cert_verify_mac(s,
3155                         NID_id_GostR3411_94,
3156                         data);
3157                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3158                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3159                         ERR_R_INTERNAL_ERROR);
3160                         goto err;
3161                 }
3162                 for (i=63,j=0; i>=0; j++, i--) {
3163                         p[2+j]=signbuf[i];
3164                 }
3165                 s2n(j,p);
3166                 n=j+2;
3167                 }
3168                 else
3169                 {
3170                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3171                         goto err;
3172                 }
3173                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3174                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3175                 }
3176         EVP_MD_CTX_cleanup(&mctx);
3177         EVP_PKEY_CTX_free(pctx);
3178         return ssl_do_write(s);
3179 err:
3180         EVP_MD_CTX_cleanup(&mctx);
3181         EVP_PKEY_CTX_free(pctx);
3182         return(-1);
3183         }
3184
3185 /* Check a certificate can be used for client authentication. Currently
3186  * check cert exists, if we have a suitable digest for TLS 1.2 if
3187  * static DH client certificates can be used and optionally checks
3188  * suitability for Suite B.
3189  */
3190 static int ssl3_check_client_certificate(SSL *s)
3191         {
3192         unsigned long alg_k;
3193         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3194                 return 0;
3195         /* If no suitable signature algorithm can't use certificate */
3196         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3197                 return 0;
3198         /* If strict mode check suitability of chain before using it.
3199          * This also adjusts suite B digest if necessary.
3200          */
3201         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3202                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3203                 return 0;
3204         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3205         /* See if we can use client certificate for fixed DH */
3206         if (alg_k & (SSL_kDHr|SSL_kDHd))
3207                 {
3208                 SESS_CERT *scert = s->session->sess_cert;
3209                 int i = scert->peer_cert_type;
3210                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3211                 clkey = s->cert->key->privatekey;
3212                 /* If client key not DH assume it can be used */
3213                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3214                         return 1;
3215                 if (i >= 0)
3216                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3217                 if (spkey)
3218                         {
3219                         /* Compare server and client parameters */
3220                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3221                         EVP_PKEY_free(spkey);
3222                         if (i != 1)
3223                                 return 0;
3224                         }
3225                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3226                 }
3227         return 1;
3228         }
3229
3230 int ssl3_send_client_certificate(SSL *s)
3231         {
3232         X509 *x509=NULL;
3233         EVP_PKEY *pkey=NULL;
3234         int i;
3235
3236         if (s->state == SSL3_ST_CW_CERT_A)
3237                 {
3238                 /* Let cert callback update client certificates if required */
3239                 if (s->cert->cert_cb
3240                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3241                         {
3242                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3243                         return 0;
3244                         }
3245                 if (ssl3_check_client_certificate(s))
3246                         s->state=SSL3_ST_CW_CERT_C;
3247                 else
3248                         s->state=SSL3_ST_CW_CERT_B;
3249                 }
3250
3251         /* We need to get a client cert */
3252         if (s->state == SSL3_ST_CW_CERT_B)
3253                 {
3254                 /* If we get an error, we need to
3255                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3256                  * We then get retied later */
3257                 i=0;
3258                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3259                 if (i < 0)
3260                         {
3261                         s->rwstate=SSL_X509_LOOKUP;
3262                         return(-1);
3263                         }
3264                 s->rwstate=SSL_NOTHING;
3265                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3266                         {
3267                         s->state=SSL3_ST_CW_CERT_B;
3268                         if (    !SSL_use_certificate(s,x509) ||
3269                                 !SSL_use_PrivateKey(s,pkey))
3270                                 i=0;
3271                         }
3272                 else if (i == 1)
3273                         {
3274                         i=0;
3275                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3276                         }
3277
3278                 if (x509 != NULL) X509_free(x509);
3279                 if (pkey != NULL) EVP_PKEY_free(pkey);
3280                 if (i && !ssl3_check_client_certificate(s))
3281                         i = 0;
3282                 if (i == 0)
3283                         {
3284                         if (s->version == SSL3_VERSION)
3285                                 {
3286                                 s->s3->tmp.cert_req=0;
3287                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3288                                 return(1);
3289                                 }
3290                         else
3291                                 {
3292                                 s->s3->tmp.cert_req=2;
3293                                 }
3294                         }
3295
3296                 /* Ok, we have a cert */
3297                 s->state=SSL3_ST_CW_CERT_C;
3298                 }
3299
3300         if (s->state == SSL3_ST_CW_CERT_C)
3301                 {
3302                 s->state=SSL3_ST_CW_CERT_D;
3303                 ssl3_output_cert_chain(s,
3304                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3305                 }
3306         /* SSL3_ST_CW_CERT_D */
3307         return ssl_do_write(s);
3308         }
3309
3310 #define has_bits(i,m)   (((i)&(m)) == (m))
3311
3312 int ssl3_check_cert_and_algorithm(SSL *s)
3313         {
3314         int i,idx;
3315         long alg_k,alg_a;
3316         EVP_PKEY *pkey=NULL;
3317         SESS_CERT *sc;
3318 #ifndef OPENSSL_NO_RSA
3319         RSA *rsa;
3320 #endif
3321 #ifndef OPENSSL_NO_DH
3322         DH *dh;
3323 #endif
3324
3325         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3326         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3327
3328         /* we don't have a certificate */
3329         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3330                 return(1);
3331
3332         sc=s->session->sess_cert;
3333         if (sc == NULL)
3334                 {
3335                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3336                 goto err;
3337                 }
3338
3339 #ifndef OPENSSL_NO_RSA
3340         rsa=s->session->sess_cert->peer_rsa_tmp;
3341 #endif
3342 #ifndef OPENSSL_NO_DH
3343         dh=s->session->sess_cert->peer_dh_tmp;
3344 #endif
3345
3346         /* This is the passed certificate */
3347
3348         idx=sc->peer_cert_type;
3349 #ifndef OPENSSL_NO_ECDH
3350         if (idx == SSL_PKEY_ECC)
3351                 {
3352                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3353                                                                 s) == 0)
3354                         { /* check failed */
3355                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3356                         goto f_err;
3357                         }
3358                 else
3359                         {
3360                         return 1;
3361                         }
3362                 }
3363         else if (alg_a & SSL_aECDSA)
3364                 {
3365                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3366                 goto f_err;
3367                 }
3368         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3369                 {
3370                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3371                 goto f_err;
3372                 }
3373 #endif
3374         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3375         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3376         EVP_PKEY_free(pkey);
3377
3378
3379         /* Check that we have a certificate if we require one */
3380         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3381                 {
3382                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3383                 goto f_err;
3384                 }
3385 #ifndef OPENSSL_NO_DSA
3386         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3387                 {
3388                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3389                 goto f_err;
3390                 }
3391 #endif
3392 #ifndef OPENSSL_NO_RSA
3393         if ((alg_k & SSL_kRSA) &&
3394                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3395                 {
3396                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3397                 goto f_err;
3398                 }
3399 #endif
3400 #ifndef OPENSSL_NO_DH
3401         if ((alg_k & SSL_kEDH) &&
3402                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3403                 {
3404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3405                 goto f_err;
3406                 }
3407         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3408                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3409                 {
3410                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3411                 goto f_err;
3412                 }
3413 #ifndef OPENSSL_NO_DSA
3414         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3415                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3416                 {
3417                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3418                 goto f_err;
3419                 }
3420 #endif
3421 #endif
3422
3423         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3424                 {
3425 #ifndef OPENSSL_NO_RSA
3426                 if (alg_k & SSL_kRSA)
3427                         {
3428                         if (rsa == NULL
3429                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3430                                 {
3431                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3432                                 goto f_err;
3433                                 }
3434                         }
3435                 else
3436 #endif
3437 #ifndef OPENSSL_NO_DH
3438                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3439                             {
3440                             if (dh == NULL
3441                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3442                                 {
3443                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3444                                 goto f_err;
3445                                 }
3446                         }
3447                 else
3448 #endif
3449                         {
3450                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3451                         goto f_err;
3452                         }
3453                 }
3454         return(1);
3455 f_err:
3456         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3457 err:
3458         return(0);
3459         }
3460
3461 /* Check to see if handshake is full or resumed. Usually this is just a
3462  * case of checking to see if a cache hit has occurred. In the case of
3463  * session tickets we have to check the next message to be sure.
3464  */
3465
3466 #ifndef OPENSSL_NO_TLSEXT
3467 # ifndef OPENSSL_NO_NEXTPROTONEG
3468 int ssl3_send_next_proto(SSL *s)
3469         {
3470         unsigned int len, padding_len;
3471         unsigned char *d;
3472
3473         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3474                 {
3475                 len = s->next_proto_negotiated_len;
3476                 padding_len = 32 - ((len + 2) % 32);
3477                 d = (unsigned char *)s->init_buf->data;
3478                 d[4] = len;
3479                 memcpy(d + 5, s->next_proto_negotiated, len);
3480                 d[5 + len] = padding_len;
3481                 memset(d + 6 + len, 0, padding_len);
3482                 *(d++)=SSL3_MT_NEXT_PROTO;
3483                 l2n3(2 + len + padding_len, d);
3484                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3485                 s->init_num = 4 + 2 + len + padding_len;
3486                 s->init_off = 0;
3487                 }
3488
3489         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3490         }
3491 # endif
3492
3493 int ssl3_check_finished(SSL *s)
3494         {
3495         int ok;
3496         long n;
3497         /* If we have no ticket it cannot be a resumed session. */
3498         if (!s->session->tlsext_tick)
3499                 return 1;
3500         /* this function is called when we really expect a Certificate
3501          * message, so permit appropriate message length */
3502         n=s->method->ssl_get_message(s,
3503                 SSL3_ST_CR_CERT_A,
3504                 SSL3_ST_CR_CERT_B,
3505                 -1,
3506                 s->max_cert_list,
3507                 &ok);
3508         if (!ok) return((int)n);
3509         s->s3->tmp.reuse_message = 1;
3510         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3511                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3512                 return 2;
3513
3514         return 1;
3515         }
3516 #endif
3517
3518 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3519         {
3520         int i = 0;
3521 #ifndef OPENSSL_NO_ENGINE
3522         if (s->ctx->client_cert_engine)
3523                 {
3524                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3525                                                 SSL_get_client_CA_list(s),
3526                                                 px509, ppkey, NULL, NULL, NULL);
3527                 if (i != 0)
3528                         return i;
3529                 }
3530 #endif
3531         if (s->ctx->client_cert_cb)
3532                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3533         return i;
3534         }
3535
3536 #ifndef OPENSSL_NO_TLSEXT
3537 int tls1_get_server_supplemental_data(SSL *s)
3538         {
3539         int al;
3540         int ok;
3541         unsigned long supp_data_len, authz_data_len;
3542         long n;
3543         unsigned short supp_data_type, authz_data_type, proof_len;
3544         const unsigned char *p;
3545         unsigned char *new_proof;
3546
3547         n=s->method->ssl_get_message(s,
3548                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3549                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3550                 SSL3_MT_SUPPLEMENTAL_DATA,
3551                 /* use default limit */
3552                 TLSEXT_MAXLEN_supplemental_data,
3553                 &ok);
3554
3555         if (!ok) return((int)n);
3556
3557         p = (unsigned char *)s->init_msg;
3558
3559         /* The message cannot be empty */
3560         if (n < 3)
3561                 {
3562                 al = SSL_AD_DECODE_ERROR;
3563                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3564                 goto f_err;
3565                 }
3566         /* Length of supplemental data */
3567         n2l3(p,supp_data_len);
3568         n -= 3;
3569         /* We must have at least one supplemental data entry
3570          * with type (1 byte) and length (2 bytes). */
3571         if (supp_data_len != (unsigned long) n || n < 4)
3572                 {
3573                 al = SSL_AD_DECODE_ERROR;
3574                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3575                 goto f_err;
3576                 }
3577         /* Supplemental data type: must be authz_data */
3578         n2s(p,supp_data_type);
3579         n -= 2;
3580         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3581                 {
3582                 al = SSL_AD_UNEXPECTED_MESSAGE;
3583                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3584                 goto f_err;
3585                 }
3586         /* Authz data length */
3587         n2s(p, authz_data_len);
3588         n -= 2;
3589         if (authz_data_len != (unsigned long) n || n < 1)
3590                 {
3591                 al = SSL_AD_DECODE_ERROR;
3592                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3593                 goto f_err;
3594                 }
3595         /* Authz data type: must be audit_proof */
3596         authz_data_type = *(p++);
3597         n -= 1;
3598         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3599                 {
3600                 al=SSL_AD_UNEXPECTED_MESSAGE;
3601                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3602                 goto f_err;
3603                 }
3604         /* We have a proof: read its length */
3605         if (n < 2)
3606                 {
3607                 al = SSL_AD_DECODE_ERROR;
3608                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3609                 goto f_err;
3610                 }
3611         n2s(p, proof_len);
3612         n -= 2;
3613         if (proof_len != (unsigned long) n)
3614                 {
3615                 al = SSL_AD_DECODE_ERROR;
3616                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3617                 goto f_err;
3618                 }
3619         /* Store the proof */
3620         new_proof = OPENSSL_realloc(s->session->audit_proof,
3621                                     proof_len);
3622         if (new_proof == NULL)
3623                 {
3624                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3625                 return 0;
3626                 }
3627         s->session->audit_proof_length = proof_len;
3628         s->session->audit_proof = new_proof;
3629         memcpy(s->session->audit_proof, p, proof_len);
3630
3631         /* Got the proof, but can't verify it yet. */
3632         return 1;
3633 f_err:
3634         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3635         return -1;
3636         }
3637 #endif