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                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
 245                                                         s->version, NULL))
 246                                 {
 247                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
 248                                 return -1;
 249                                 }
 250
 251                         /* s->version=SSL3_VERSION; */
 252                         s->type=SSL_ST_CONNECT;
 253
 254                         if (s->init_buf == NULL)
 255                                 {
 256                                 if ((buf=BUF_MEM_new()) == NULL)
 257                                         {
 258                                         ret= -1;
 259                                         goto end;
 260                                         }
 261                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 262                                         {
 263                                         ret= -1;
 264                                         goto end;
 265                                         }
 266                                 s->init_buf=buf;
 267                                 buf=NULL;
 268                                 }
 269
 270                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 271
 272                         /* setup buffing BIO */
 273                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 274
 275                         /* don't push the buffering BIO quite yet */
 276
 277                         ssl3_init_finished_mac(s);
 278
 279                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 280                         s->ctx->stats.sess_connect++;
 281                         s->init_num=0;
 282                         break;
 283
 284                 case SSL3_ST_CW_CLNT_HELLO_A:
 285                 case SSL3_ST_CW_CLNT_HELLO_B:
 286
 287                         s->shutdown=0;
 288                         ret=ssl3_client_hello(s);
 289                         if (ret <= 0) goto end;
 290                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 291                         s->init_num=0;
 292
 293                         /* turn on buffering for the next lot of output */
 294                         if (s->bbio != s->wbio)
 295                                 s->wbio=BIO_push(s->bbio,s->wbio);
 296
 297                         break;
 298
 299                 case SSL3_ST_CR_SRVR_HELLO_A:
 300                 case SSL3_ST_CR_SRVR_HELLO_B:
 301                         ret=ssl3_get_server_hello(s);
 302                         if (ret <= 0) goto end;
 303
 304                         if (s->hit)
 305                                 {
 306                                 s->state=SSL3_ST_CR_FINISHED_A;
 307 #ifndef OPENSSL_NO_TLSEXT
 308                                 if (s->tlsext_ticket_expected)
 309                                         {
 310                                         /* receive renewed session ticket */
 311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 312                                         }
 313 #endif
 314                                 }
 315                         else
 316                                 {
 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 == 3)
 336                                 {
 337                                 s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 338                                 s->init_num=0;
 339                                 break;
 340                                 }
 341                         if (ret == 2)
 342                                 {
 343                                 s->hit = 1;
 344                                 if (s->tlsext_ticket_expected)
 345                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 346                                 else
 347                                         s->state=SSL3_ST_CR_FINISHED_A;
 348                                 s->init_num=0;
 349                                 break;
 350                                 }
 351 #endif
 352                         /* Check if it is anon DH/ECDH */
 353                         /* or PSK */
 354                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 355                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 356                                 {
 357                                 ret=ssl3_get_server_certificate(s);
 358                                 if (ret <= 0) goto end;
 359 #ifndef OPENSSL_NO_TLSEXT
 360                                 if (s->tlsext_status_expected)
 361                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 362                                 else
 363                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 364                                 }
 365                         else
 366                                 {
 367                                 skip = 1;
 368                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 369                                 }
 370 #else
 371                                 }
 372                         else
 373                                 skip=1;
 374
 375                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 376 #endif
 377                         s->init_num=0;
 378                         break;
 379
 380                 case SSL3_ST_CR_KEY_EXCH_A:
 381                 case SSL3_ST_CR_KEY_EXCH_B:
 382                         ret=ssl3_get_key_exchange(s);
 383                         if (ret <= 0) goto end;
 384                         s->state=SSL3_ST_CR_CERT_REQ_A;
 385                         s->init_num=0;
 386
 387                         /* at this point we check that we have the
 388                          * required stuff from the server */
 389                         if (!ssl3_check_cert_and_algorithm(s))
 390                                 {
 391                                 ret= -1;
 392                                 goto end;
 393                                 }
 394                         break;
 395
 396                 case SSL3_ST_CR_CERT_REQ_A:
 397                 case SSL3_ST_CR_CERT_REQ_B:
 398                         ret=ssl3_get_certificate_request(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 401                         s->init_num=0;
 402                         break;
 403
 404                 case SSL3_ST_CR_SRVR_DONE_A:
 405                 case SSL3_ST_CR_SRVR_DONE_B:
 406                         ret=ssl3_get_server_done(s);
 407                         if (ret <= 0) goto end;
 408 #ifndef OPENSSL_NO_SRP
 409                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 410                                 {
 411                                 if ((ret = SRP_Calc_A_param(s))<=0)
 412                                         {
 413                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 414                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 415                                         goto end;
 416                                         }
 417                                 }
 418 #endif
 419 #ifndef OPENSSL_NO_TLSEXT
 420                         s->state=SSL3_ST_CW_SUPPLEMENTAL_DATA_A;
 421 #else
 422                         if (s->s3->tmp.cert_req)
 423                                 s->state=SSL3_ST_CW_CERT_A;
 424                         else
 425                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 426 #endif
 427                         s->init_num=0;
 428
 429                         break;
 430
 431                 case SSL3_ST_CW_CERT_A:
 432                 case SSL3_ST_CW_CERT_B:
 433                 case SSL3_ST_CW_CERT_C:
 434                 case SSL3_ST_CW_CERT_D:
 435                         ret=ssl3_send_client_certificate(s);
 436                         if (ret <= 0) goto end;
 437                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_CW_KEY_EXCH_A:
 442                 case SSL3_ST_CW_KEY_EXCH_B:
 443                         ret=ssl3_send_client_key_exchange(s);
 444                         if (ret <= 0) goto end;
 445                         /* EAY EAY EAY need to check for DH fix cert
 446                          * sent back */
 447                         /* For TLS, cert_req is set to 2, so a cert chain
 448                          * of nothing is sent, but no verify packet is sent */
 449                         /* XXX: For now, we do not support client
 450                          * authentication in ECDH cipher suites with
 451                          * ECDH (rather than ECDSA) certificates.
 452                          * We need to skip the certificate verify
 453                          * message when client's ECDH public key is sent
 454                          * inside the client certificate.
 455                          */
 456                         if (s->s3->tmp.cert_req == 1)
 457                                 {
 458                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 459                                 }
 460                         else
 461                                 {
 462                                 s->state=SSL3_ST_CW_CHANGE_A;
 463                                 s->s3->change_cipher_spec=0;
 464                                 }
 465                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 466                                 {
 467                                 s->state=SSL3_ST_CW_CHANGE_A;
 468                                 s->s3->change_cipher_spec=0;
 469                                 }
 470
 471                         s->init_num=0;
 472                         break;
 473
 474                 case SSL3_ST_CW_CERT_VRFY_A:
 475                 case SSL3_ST_CW_CERT_VRFY_B:
 476                         ret=ssl3_send_client_verify(s);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CW_CHANGE_A;
 479                         s->init_num=0;
 480                         s->s3->change_cipher_spec=0;
 481                         break;
 482
 483                 case SSL3_ST_CW_CHANGE_A:
 484                 case SSL3_ST_CW_CHANGE_B:
 485                         ret=ssl3_send_change_cipher_spec(s,
 486                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 487                         if (ret <= 0) goto end;
 488
 489 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 490                         s->state=SSL3_ST_CW_FINISHED_A;
 491 #else
 492                         if (s->s3->next_proto_neg_seen)
 493                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 494                         else
 495                                 s->state=SSL3_ST_CW_FINISHED_A;
 496 #endif
 497                         s->init_num=0;
 498
 499                         s->session->cipher=s->s3->tmp.new_cipher;
 500 #ifdef OPENSSL_NO_COMP
 501                         s->session->compress_meth=0;
 502 #else
 503                         if (s->s3->tmp.new_compression == NULL)
 504                                 s->session->compress_meth=0;
 505                         else
 506                                 s->session->compress_meth=
 507                                         s->s3->tmp.new_compression->id;
 508 #endif
 509                         if (!s->method->ssl3_enc->setup_key_block(s))
 510                                 {
 511                                 ret= -1;
 512                                 goto end;
 513                                 }
 514
 515                         if (!s->method->ssl3_enc->change_cipher_state(s,
 516                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 517                                 {
 518                                 ret= -1;
 519                                 goto end;
 520                                 }
 521
 522                         break;
 523
 524 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 525                 case SSL3_ST_CW_NEXT_PROTO_A:
 526                 case SSL3_ST_CW_NEXT_PROTO_B:
 527                         ret=ssl3_send_next_proto(s);
 528                         if (ret <= 0) goto end;
 529                         s->state=SSL3_ST_CW_FINISHED_A;
 530                         break;
 531 #endif
 532
 533 #ifndef OPENSSL_NO_TLSEXT
 534                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_A:
 535                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_B:
 536                         ret = tls1_send_client_supplemental_data(s, &skip);
 537                         if (ret <= 0) goto end;
 538                         if (s->s3->tmp.cert_req)
 539                                 s->state=SSL3_ST_CW_CERT_A;
 540                         else
 541                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 542                         s->init_num=0;
 543                         break;
 544 #endif
 545
 546                 case SSL3_ST_CW_FINISHED_A:
 547                 case SSL3_ST_CW_FINISHED_B:
 548                         ret=ssl3_send_finished(s,
 549                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 550                                 s->method->ssl3_enc->client_finished_label,
 551                                 s->method->ssl3_enc->client_finished_label_len);
 552                         if (ret <= 0) goto end;
 553                         s->state=SSL3_ST_CW_FLUSH;
 554
 555                         /* clear flags */
 556                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 557                         if (s->hit)
 558                                 {
 559                                 s->s3->tmp.next_state=SSL_ST_OK;
 560                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 561                                         {
 562                                         s->state=SSL_ST_OK;
 563                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 564                                         s->s3->delay_buf_pop_ret=0;
 565                                         }
 566                                 }
 567                         else
 568                                 {
 569 #ifndef OPENSSL_NO_TLSEXT
 570                                 /* Allow NewSessionTicket if ticket expected */
 571                                 if (s->tlsext_ticket_expected)
 572                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 573                                 else
 574 #endif
 575
 576                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 577                                 }
 578                         s->init_num=0;
 579                         break;
 580
 581 #ifndef OPENSSL_NO_TLSEXT
 582                 case SSL3_ST_CR_SESSION_TICKET_A:
 583                 case SSL3_ST_CR_SESSION_TICKET_B:
 584                         ret=ssl3_get_new_session_ticket(s);
 585                         if (ret <= 0) goto end;
 586                         s->state=SSL3_ST_CR_FINISHED_A;
 587                         s->init_num=0;
 588                 break;
 589
 590                 case SSL3_ST_CR_CERT_STATUS_A:
 591                 case SSL3_ST_CR_CERT_STATUS_B:
 592                         ret=ssl3_get_cert_status(s);
 593                         if (ret <= 0) goto end;
 594                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 595                         s->init_num=0;
 596                 break;
 597 #endif
 598
 599                 case SSL3_ST_CR_FINISHED_A:
 600                 case SSL3_ST_CR_FINISHED_B:
 601
 602                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 603                                 SSL3_ST_CR_FINISHED_B);
 604                         if (ret <= 0) goto end;
 605
 606                         if (s->hit)
 607                                 s->state=SSL3_ST_CW_CHANGE_A;
 608                         else
 609                                 s->state=SSL_ST_OK;
 610                         s->init_num=0;
 611                         break;
 612
 613                 case SSL3_ST_CW_FLUSH:
 614                         s->rwstate=SSL_WRITING;
 615                         if (BIO_flush(s->wbio) <= 0)
 616                                 {
 617                                 ret= -1;
 618                                 goto end;
 619                                 }
 620                         s->rwstate=SSL_NOTHING;
 621                         s->state=s->s3->tmp.next_state;
 622                         break;
 623
 624                 case SSL_ST_OK:
 625                         /* clean a few things up */
 626                         ssl3_cleanup_key_block(s);
 627
 628                         if (s->init_buf != NULL)
 629                                 {
 630                                 BUF_MEM_free(s->init_buf);
 631                                 s->init_buf=NULL;
 632                                 }
 633
 634                         /* If we are not 'joining' the last two packets,
 635                          * remove the buffering now */
 636                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 637                                 ssl_free_wbio_buffer(s);
 638                         /* else do it later in ssl3_write */
 639
 640                         s->init_num=0;
 641                         s->renegotiate=0;
 642                         s->new_session=0;
 643
 644                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 645                         if (s->hit) s->ctx->stats.sess_hit++;
 646
 647                         ret=1;
 648                         /* s->server=0; */
 649                         s->handshake_func=ssl3_connect;
 650                         s->ctx->stats.sess_connect_good++;
 651
 652                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 653
 654                         goto end;
 655                         /* break; */
 656
 657                 default:
 658                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 659                         ret= -1;
 660                         goto end;
 661                         /* break; */
 662                         }
 663
 664                 /* did we do anything */
 665                 if (!s->s3->tmp.reuse_message && !skip)
 666                         {
 667                         if (s->debug)
 668                                 {
 669                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 670                                         goto end;
 671                                 }
 672
 673                         if ((cb != NULL) && (s->state != state))
 674                                 {
 675                                 new_state=s->state;
 676                                 s->state=state;
 677                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 678                                 s->state=new_state;
 679                                 }
 680                         }
 681                 skip=0;
 682                 }
 683 end:
 684         s->in_handshake--;
 685         if (buf != NULL)
 686                 BUF_MEM_free(buf);
 687         if (cb != NULL)
 688                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 689         return(ret);
 690         }
 691
 692
 693 int ssl3_client_hello(SSL *s)
 694         {
 695         unsigned char *buf;
 696         unsigned char *p,*d;
 697         int i;
 698         unsigned long l;
 699         int al = 0;
 700 #ifndef OPENSSL_NO_COMP
 701         int j;
 702         SSL_COMP *comp;
 703 #endif
 704
 705         buf=(unsigned char *)s->init_buf->data;
 706         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 707                 {
 708                 SSL_SESSION *sess = s->session;
 709                 if ((sess == NULL) ||
 710                         (sess->ssl_version != s->version) ||
 711 #ifdef OPENSSL_NO_TLSEXT
 712                         !sess->session_id_length ||
 713 #else
 714                         (!sess->session_id_length && !sess->tlsext_tick) ||
 715 #endif
 716                         (sess->not_resumable))
 717                         {
 718                         if (!ssl_get_new_session(s,0))
 719                                 goto err;
 720                         }
 721                 if (s->method->version == DTLS_ANY_VERSION)
 722                         {
 723                         /* Determine which DTLS version to use */
 724                         int options = s->options;
 725                         /* If DTLS 1.2 disabled correct the version number */
 726                         if (options & SSL_OP_NO_DTLSv1_2)
 727                                 {
 728                                 if (tls1_suiteb(s))
 729                                         {
 730                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 731                                         goto err;
 732                                         }
 733                                 /* Disabling all versions is silly: return an
 734                                  * error.
 735                                  */
 736                                 if (options & SSL_OP_NO_DTLSv1)
 737                                         {
 738                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 739                                         goto err;
 740                                         }
 741                                 /* Update method so we don't use any DTLS 1.2
 742                                  * features.
 743                                  */
 744                                 s->method = DTLSv1_client_method();
 745                                 s->version = DTLS1_VERSION;
 746                                 }
 747                         else
 748                                 {
 749                                 /* We only support one version: update method */
 750                                 if (options & SSL_OP_NO_DTLSv1)
 751                                         s->method = DTLSv1_2_client_method();
 752                                 s->version = DTLS1_2_VERSION;
 753                                 }
 754                         s->client_version = s->version;
 755                         }
 756                 /* else use the pre-loaded session */
 757
 758                 p=s->s3->client_random;
 759
 760                 /* for DTLS if client_random is initialized, reuse it, we are
 761                  * required to use same upon reply to HelloVerify */
 762                 if (SSL_IS_DTLS(s))
 763                         {
 764                         size_t idx;
 765                         i = 1;
 766                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 767                                 {
 768                                 if (p[idx])
 769                                         {
 770                                         i = 0;
 771                                         break;
 772                                         }
 773                                 }
 774                         }
 775                 else
 776                         i = 1;
 777
 778                 if (i)
 779                         ssl_fill_hello_random(s, 0, p,
 780                                               sizeof(s->s3->client_random));
 781
 782                 /* Do the message type and length last */
 783                 d=p= ssl_handshake_start(s);
 784
 785                 /* version indicates the negotiated version: for example from
 786                  * an SSLv2/v3 compatible client hello). The client_version
 787                  * field is the maximum version we permit and it is also
 788                  * used in RSA encrypted premaster secrets. Some servers can
 789                  * choke if we initially report a higher version then
 790                  * renegotiate to a lower one in the premaster secret. This
 791                  * didn't happen with TLS 1.0 as most servers supported it
 792                  * but it can with TLS 1.1 or later if the server only supports
 793                  * 1.0.
 794                  *
 795                  * Possible scenario with previous logic:
 796                  *      1. Client hello indicates TLS 1.2
 797                  *      2. Server hello says TLS 1.0
 798                  *      3. RSA encrypted premaster secret uses 1.2.
 799                  *      4. Handhaked proceeds using TLS 1.0.
 800                  *      5. Server sends hello request to renegotiate.
 801                  *      6. Client hello indicates TLS v1.0 as we now
 802                  *         know that is maximum server supports.
 803                  *      7. Server chokes on RSA encrypted premaster secret
 804                  *         containing version 1.0.
 805                  *
 806                  * For interoperability it should be OK to always use the
 807                  * maximum version we support in client hello and then rely
 808                  * on the checking of version to ensure the servers isn't
 809                  * being inconsistent: for example initially negotiating with
 810                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 811                  * client_version in client hello and not resetting it to
 812                  * the negotiated version.
 813                  */
 814 #if 0
 815                 *(p++)=s->version>>8;
 816                 *(p++)=s->version&0xff;
 817                 s->client_version=s->version;
 818 #else
 819                 *(p++)=s->client_version>>8;
 820                 *(p++)=s->client_version&0xff;
 821 #endif
 822
 823                 /* Random stuff */
 824                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 825                 p+=SSL3_RANDOM_SIZE;
 826
 827                 /* Session ID */
 828                 if (s->new_session)
 829                         i=0;
 830                 else
 831                         i=s->session->session_id_length;
 832                 *(p++)=i;
 833                 if (i != 0)
 834                         {
 835                         if (i > (int)sizeof(s->session->session_id))
 836                                 {
 837                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 838                                 goto err;
 839                                 }
 840                         memcpy(p,s->session->session_id,i);
 841                         p+=i;
 842                         }
 843
 844                 /* cookie stuff for DTLS */
 845                 if (SSL_IS_DTLS(s))
 846                         {
 847                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 848                                 {
 849                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 850                                 goto err;
 851                                 }
 852                         *(p++) = s->d1->cookie_len;
 853                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 854                         p += s->d1->cookie_len;
 855                         }
 856
 857                 /* Ciphers supported */
 858                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 859                 if (i == 0)
 860                         {
 861                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 862                         goto err;
 863                         }
 864 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 865                         /* Some servers hang if client hello > 256 bytes
 866                          * as hack workaround chop number of supported ciphers
 867                          * to keep it well below this if we use TLS v1.2
 868                          */
 869                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 870                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 871                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 872 #endif
 873                 s2n(i,p);
 874                 p+=i;
 875
 876                 /* COMPRESSION */
 877 #ifdef OPENSSL_NO_COMP
 878                 *(p++)=1;
 879 #else
 880
 881                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
 882                         j=0;
 883                 else
 884                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 885                 *(p++)=1+j;
 886                 for (i=0; i<j; i++)
 887                         {
 888                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 889                         *(p++)=comp->id;
 890                         }
 891 #endif
 892                 *(p++)=0; /* Add the NULL method */
 893
 894 #ifndef OPENSSL_NO_TLSEXT
 895                 /* TLS extensions*/
 896                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 897                         {
 898                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 899                         goto err;
 900                         }
 901                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 902                         {
 903                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 904                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 905                         goto err;
 906                         }
 907 #endif
 908
 909                 l= p-d;
 910                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 911                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 912                 }
 913
 914         /* SSL3_ST_CW_CLNT_HELLO_B */
 915         return ssl_do_write(s);
 916 err:
 917         return(-1);
 918         }
 919
 920 int ssl3_get_server_hello(SSL *s)
 921         {
 922         STACK_OF(SSL_CIPHER) *sk;
 923         const SSL_CIPHER *c;
 924         CERT *ct = s->cert;
 925         unsigned char *p,*d;
 926         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 927         unsigned int j;
 928         long n;
 929 #ifndef OPENSSL_NO_COMP
 930         SSL_COMP *comp;
 931 #endif
 932         /* Hello verify request and/or server hello version may not
 933          * match so set first packet if we're negotiating version.
 934          */
 935         if (SSL_IS_DTLS(s))
 936                 s->first_packet = 1;
 937
 938         n=s->method->ssl_get_message(s,
 939                 SSL3_ST_CR_SRVR_HELLO_A,
 940                 SSL3_ST_CR_SRVR_HELLO_B,
 941                 -1,
 942                 20000, /* ?? */
 943                 &ok);
 944
 945         if (!ok) return((int)n);
 946
 947         if (SSL_IS_DTLS(s))
 948                 {
 949                 s->first_packet = 0;
 950                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 951                         {
 952                         if ( s->d1->send_cookie == 0)
 953                                 {
 954                                 s->s3->tmp.reuse_message = 1;
 955                                 return 1;
 956                                 }
 957                         else /* already sent a cookie */
 958                                 {
 959                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 960                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 961                                 goto f_err;
 962                                 }
 963                         }
 964                 }
 965
 966         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 967                 {
 968                 al=SSL_AD_UNEXPECTED_MESSAGE;
 969                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 970                 goto f_err;
 971                 }
 972
 973         d=p=(unsigned char *)s->init_msg;
 974         if (s->method->version == DTLS_ANY_VERSION)
 975                 {
 976                 /* Work out correct protocol version to use */
 977                 int hversion = (p[0] << 8)|p[1];
 978                 int options = s->options;
 979                 if (hversion == DTLS1_2_VERSION
 980                         && !(options & SSL_OP_NO_DTLSv1_2))
 981                         s->method = DTLSv1_2_client_method();
 982                 else if (tls1_suiteb(s))
 983                         {
 984                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 985                         s->version = hversion;
 986                         al = SSL_AD_PROTOCOL_VERSION;
 987                         goto f_err;
 988                         }
 989                 else if (hversion == DTLS1_VERSION
 990                         && !(options & SSL_OP_NO_DTLSv1))
 991                         s->method = DTLSv1_client_method();
 992                 else
 993                         {
 994                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 995                         s->version = hversion;
 996                         al = SSL_AD_PROTOCOL_VERSION;
 997                         goto f_err;
 998                         }
 999                 s->version = s->client_version = s->method->version;
1000                 }
1001
1002         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
1003                 {
1004                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
1005                 s->version=(s->version&0xff00)|p[1];
1006                 al=SSL_AD_PROTOCOL_VERSION;
1007                 goto f_err;
1008                 }
1009         p+=2;
1010
1011         /* load the server hello data */
1012         /* load the server random */
1013         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
1014         p+=SSL3_RANDOM_SIZE;
1015
1016         /* get the session-id */
1017         j= *(p++);
1018
1019         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1020                 {
1021                 al=SSL_AD_ILLEGAL_PARAMETER;
1022                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1023                 goto f_err;
1024                 }
1025
1026 #ifndef OPENSSL_NO_TLSEXT
1027         /* check if we want to resume the session based on external pre-shared secret */
1028         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1029                 {
1030                 SSL_CIPHER *pref_cipher=NULL;
1031                 s->session->master_key_length=sizeof(s->session->master_key);
1032                 if (s->tls_session_secret_cb(s, s->session->master_key,
1033                                              &s->session->master_key_length,
1034                                              NULL, &pref_cipher,
1035                                              s->tls_session_secret_cb_arg))
1036                         {
1037                         s->session->cipher = pref_cipher ?
1038                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1039                         }
1040                 }
1041 #endif /* OPENSSL_NO_TLSEXT */
1042
1043         if (j != 0 && j == s->session->session_id_length
1044             && memcmp(p,s->session->session_id,j) == 0)
1045             {
1046             if(s->sid_ctx_length != s->session->sid_ctx_length
1047                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1048                 {
1049                 /* actually a client application bug */
1050                 al=SSL_AD_ILLEGAL_PARAMETER;
1051                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1052                 goto f_err;
1053                 }
1054             s->hit=1;
1055             }
1056         else    /* a miss or crap from the other end */
1057                 {
1058                 /* If we were trying for session-id reuse, make a new
1059                  * SSL_SESSION so we don't stuff up other people */
1060                 s->hit=0;
1061                 if (s->session->session_id_length > 0)
1062                         {
1063                         if (!ssl_get_new_session(s,0))
1064                                 {
1065                                 goto f_err;
1066                                 }
1067                         }
1068                 s->session->session_id_length=j;
1069                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1070                 }
1071         p+=j;
1072         c=ssl_get_cipher_by_char(s,p);
1073         if (c == NULL)
1074                 {
1075                 /* unknown cipher */
1076                 al=SSL_AD_ILLEGAL_PARAMETER;
1077                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1078                 goto f_err;
1079                 }
1080         /* Set version disabled mask now we know version */
1081         if (!SSL_USE_TLS1_2_CIPHERS(s))
1082                 ct->mask_ssl = SSL_TLSV1_2;
1083         else
1084                 ct->mask_ssl = 0;
1085         /* If it is a disabled cipher we didn't send it in client hello,
1086          * so return an error.
1087          */
1088         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1089                 {
1090                 al=SSL_AD_ILLEGAL_PARAMETER;
1091                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1092                 goto f_err;
1093                 }
1094         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1095
1096         sk=ssl_get_ciphers_by_id(s);
1097         i=sk_SSL_CIPHER_find(sk,c);
1098         if (i < 0)
1099                 {
1100                 /* we did not say we would use this cipher */
1101                 al=SSL_AD_ILLEGAL_PARAMETER;
1102                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1103                 goto f_err;
1104                 }
1105
1106         /* Depending on the session caching (internal/external), the cipher
1107            and/or cipher_id values may not be set. Make sure that
1108            cipher_id is set and use it for comparison. */
1109         if (s->session->cipher)
1110                 s->session->cipher_id = s->session->cipher->id;
1111         if (s->hit && (s->session->cipher_id != c->id))
1112                 {
1113 /* Workaround is now obsolete */
1114 #if 0
1115                 if (!(s->options &
1116                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1117 #endif
1118                         {
1119                         al=SSL_AD_ILLEGAL_PARAMETER;
1120                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1121                         goto f_err;
1122                         }
1123                 }
1124         s->s3->tmp.new_cipher=c;
1125         /* Don't digest cached records if no sigalgs: we may need them for
1126          * client authentication.
1127          */
1128         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1129                 goto f_err;
1130         /* lets get the compression algorithm */
1131         /* COMPRESSION */
1132 #ifdef OPENSSL_NO_COMP
1133         if (*(p++) != 0)
1134                 {
1135                 al=SSL_AD_ILLEGAL_PARAMETER;
1136                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1137                 goto f_err;
1138                 }
1139         /* If compression is disabled we'd better not try to resume a session
1140          * using compression.
1141          */
1142         if (s->session->compress_meth != 0)
1143                 {
1144                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1145                 goto f_err;
1146                 }
1147 #else
1148         j= *(p++);
1149         if (s->hit && j != s->session->compress_meth)
1150                 {
1151                 al=SSL_AD_ILLEGAL_PARAMETER;
1152                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1153                 goto f_err;
1154                 }
1155         if (j == 0)
1156                 comp=NULL;
1157         else if (!ssl_allow_compression(s))
1158                 {
1159                 al=SSL_AD_ILLEGAL_PARAMETER;
1160                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1161                 goto f_err;
1162                 }
1163         else
1164                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1165
1166         if ((j != 0) && (comp == NULL))
1167                 {
1168                 al=SSL_AD_ILLEGAL_PARAMETER;
1169                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1170                 goto f_err;
1171                 }
1172         else
1173                 {
1174                 s->s3->tmp.new_compression=comp;
1175                 }
1176 #endif
1177
1178 #ifndef OPENSSL_NO_TLSEXT
1179         /* TLS extensions*/
1180         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1181                 {
1182                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1183                 goto err;
1184                 }
1185 #endif
1186
1187         if (p != (d+n))
1188                 {
1189                 /* wrong packet length */
1190                 al=SSL_AD_DECODE_ERROR;
1191                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1192                 goto f_err;
1193                 }
1194
1195         return(1);
1196 f_err:
1197         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1198 err:
1199         return(-1);
1200         }
1201
1202 int ssl3_get_server_certificate(SSL *s)
1203         {
1204         int al,i,ok,ret= -1;
1205         unsigned long n,nc,llen,l;
1206         X509 *x=NULL;
1207         const unsigned char *q,*p;
1208         unsigned char *d;
1209         STACK_OF(X509) *sk=NULL;
1210         SESS_CERT *sc;
1211         EVP_PKEY *pkey=NULL;
1212         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1213
1214         n=s->method->ssl_get_message(s,
1215                 SSL3_ST_CR_CERT_A,
1216                 SSL3_ST_CR_CERT_B,
1217                 -1,
1218                 s->max_cert_list,
1219                 &ok);
1220
1221         if (!ok) return((int)n);
1222
1223         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1224                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1225                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1226                 {
1227                 s->s3->tmp.reuse_message=1;
1228                 return(1);
1229                 }
1230
1231         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1232                 {
1233                 al=SSL_AD_UNEXPECTED_MESSAGE;
1234                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1235                 goto f_err;
1236                 }
1237         p=d=(unsigned char *)s->init_msg;
1238
1239         if ((sk=sk_X509_new_null()) == NULL)
1240                 {
1241                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1242                 goto err;
1243                 }
1244
1245         n2l3(p,llen);
1246         if (llen+3 != n)
1247                 {
1248                 al=SSL_AD_DECODE_ERROR;
1249                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1250                 goto f_err;
1251                 }
1252         for (nc=0; nc<llen; )
1253                 {
1254                 n2l3(p,l);
1255                 if ((l+nc+3) > llen)
1256                         {
1257                         al=SSL_AD_DECODE_ERROR;
1258                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1259                         goto f_err;
1260                         }
1261
1262                 q=p;
1263                 x=d2i_X509(NULL,&q,l);
1264                 if (x == NULL)
1265                         {
1266                         al=SSL_AD_BAD_CERTIFICATE;
1267                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1268                         goto f_err;
1269                         }
1270                 if (q != (p+l))
1271                         {
1272                         al=SSL_AD_DECODE_ERROR;
1273                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1274                         goto f_err;
1275                         }
1276                 if (!sk_X509_push(sk,x))
1277                         {
1278                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1279                         goto err;
1280                         }
1281                 x=NULL;
1282                 nc+=l+3;
1283                 p=q;
1284                 }
1285
1286         i=ssl_verify_cert_chain(s,sk);
1287         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1288 #ifndef OPENSSL_NO_KRB5
1289             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1290                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1291 #endif /* OPENSSL_NO_KRB5 */
1292                 )
1293                 {
1294                 al=ssl_verify_alarm_type(s->verify_result);
1295                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1296                 goto f_err;
1297                 }
1298         ERR_clear_error(); /* but we keep s->verify_result */
1299         if (i > 1)
1300                 {
1301                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1302                 al = SSL_AD_HANDSHAKE_FAILURE;
1303                 goto f_err;
1304                 }
1305
1306         sc=ssl_sess_cert_new();
1307         if (sc == NULL) goto err;
1308
1309         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1310         s->session->sess_cert=sc;
1311
1312         sc->cert_chain=sk;
1313         /* Inconsistency alert: cert_chain does include the peer's
1314          * certificate, which we don't include in s3_srvr.c */
1315         x=sk_X509_value(sk,0);
1316         sk=NULL;
1317         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1318
1319         pkey=X509_get_pubkey(x);
1320
1321         /* VRS: allow null cert if auth == KRB5 */
1322         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1323                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1324                     ? 0 : 1;
1325
1326 #ifdef KSSL_DEBUG
1327         printf("pkey,x = %p, %p\n", pkey,x);
1328         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1329         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1330                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1331 #endif    /* KSSL_DEBUG */
1332
1333         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1334                 {
1335                 x=NULL;
1336                 al=SSL3_AL_FATAL;
1337                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1338                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1339                 goto f_err;
1340                 }
1341
1342         i=ssl_cert_type(x,pkey);
1343         if (need_cert && i < 0)
1344                 {
1345                 x=NULL;
1346                 al=SSL3_AL_FATAL;
1347                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1348                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1349                 goto f_err;
1350                 }
1351
1352         if (need_cert)
1353                 {
1354                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1355                 if (exp_idx >= 0 && i != exp_idx)
1356                         {
1357                         x=NULL;
1358                         al=SSL_AD_ILLEGAL_PARAMETER;
1359                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1360                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1361                         goto f_err;
1362                         }
1363                 sc->peer_cert_type=i;
1364                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1365                 /* Why would the following ever happen?
1366                  * We just created sc a couple of lines ago. */
1367                 if (sc->peer_pkeys[i].x509 != NULL)
1368                         X509_free(sc->peer_pkeys[i].x509);
1369                 sc->peer_pkeys[i].x509=x;
1370                 sc->peer_key= &(sc->peer_pkeys[i]);
1371
1372                 if (s->session->peer != NULL)
1373                         X509_free(s->session->peer);
1374                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1375                 s->session->peer=x;
1376                 }
1377         else
1378                 {
1379                 sc->peer_cert_type=i;
1380                 sc->peer_key= NULL;
1381
1382                 if (s->session->peer != NULL)
1383                         X509_free(s->session->peer);
1384                 s->session->peer=NULL;
1385                 }
1386         s->session->verify_result = s->verify_result;
1387
1388         x=NULL;
1389         ret=1;
1390         if (0)
1391                 {
1392 f_err:
1393                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1394                 }
1395 err:
1396         EVP_PKEY_free(pkey);
1397         X509_free(x);
1398         sk_X509_pop_free(sk,X509_free);
1399         return(ret);
1400         }
1401
1402 int ssl3_get_key_exchange(SSL *s)
1403         {
1404 #ifndef OPENSSL_NO_RSA
1405         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1406 #endif
1407         EVP_MD_CTX md_ctx;
1408         unsigned char *param,*p;
1409         int al,i,j,param_len,ok;
1410         long n,alg_k,alg_a;
1411         EVP_PKEY *pkey=NULL;
1412         const EVP_MD *md = NULL;
1413 #ifndef OPENSSL_NO_RSA
1414         RSA *rsa=NULL;
1415 #endif
1416 #ifndef OPENSSL_NO_DH
1417         DH *dh=NULL;
1418 #endif
1419 #ifndef OPENSSL_NO_ECDH
1420         EC_KEY *ecdh = NULL;
1421         BN_CTX *bn_ctx = NULL;
1422         EC_POINT *srvr_ecpoint = NULL;
1423         int curve_nid = 0;
1424         int encoded_pt_len = 0;
1425 #endif
1426
1427         /* use same message size as in ssl3_get_certificate_request()
1428          * as ServerKeyExchange message may be skipped */
1429         n=s->method->ssl_get_message(s,
1430                 SSL3_ST_CR_KEY_EXCH_A,
1431                 SSL3_ST_CR_KEY_EXCH_B,
1432                 -1,
1433                 s->max_cert_list,
1434                 &ok);
1435         if (!ok) return((int)n);
1436
1437         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1438                 {
1439 #ifndef OPENSSL_NO_PSK
1440                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1441                    omitted if no identity hint is sent. Set
1442                    session->sess_cert anyway to avoid problems
1443                    later.*/
1444                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1445                         {
1446                         s->session->sess_cert=ssl_sess_cert_new();
1447                         if (s->ctx->psk_identity_hint)
1448                                 OPENSSL_free(s->ctx->psk_identity_hint);
1449                         s->ctx->psk_identity_hint = NULL;
1450                         }
1451 #endif
1452                 s->s3->tmp.reuse_message=1;
1453                 return(1);
1454                 }
1455
1456         param=p=(unsigned char *)s->init_msg;
1457         if (s->session->sess_cert != NULL)
1458                 {
1459 #ifndef OPENSSL_NO_RSA
1460                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1461                         {
1462                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1463                         s->session->sess_cert->peer_rsa_tmp=NULL;
1464                         }
1465 #endif
1466 #ifndef OPENSSL_NO_DH
1467                 if (s->session->sess_cert->peer_dh_tmp)
1468                         {
1469                         DH_free(s->session->sess_cert->peer_dh_tmp);
1470                         s->session->sess_cert->peer_dh_tmp=NULL;
1471                         }
1472 #endif
1473 #ifndef OPENSSL_NO_ECDH
1474                 if (s->session->sess_cert->peer_ecdh_tmp)
1475                         {
1476                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1477                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1478                         }
1479 #endif
1480                 }
1481         else
1482                 {
1483                 s->session->sess_cert=ssl_sess_cert_new();
1484                 }
1485
1486         param_len=0;
1487         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1488         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1489         EVP_MD_CTX_init(&md_ctx);
1490
1491 #ifndef OPENSSL_NO_PSK
1492         if (alg_k & SSL_kPSK)
1493                 {
1494                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1495
1496                 al=SSL_AD_HANDSHAKE_FAILURE;
1497                 n2s(p,i);
1498                 param_len=i+2;
1499                 /* Store PSK identity hint for later use, hint is used
1500                  * in ssl3_send_client_key_exchange.  Assume that the
1501                  * maximum length of a PSK identity hint can be as
1502                  * long as the maximum length of a PSK identity. */
1503                 if (i > PSK_MAX_IDENTITY_LEN)
1504                         {
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1506                                 SSL_R_DATA_LENGTH_TOO_LONG);
1507                         goto f_err;
1508                         }
1509                 if (param_len > n)
1510                         {
1511                         al=SSL_AD_DECODE_ERROR;
1512                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1513                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1514                         goto f_err;
1515                         }
1516                 /* If received PSK identity hint contains NULL
1517                  * characters, the hint is truncated from the first
1518                  * NULL. p may not be ending with NULL, so create a
1519                  * NULL-terminated string. */
1520                 memcpy(tmp_id_hint, p, i);
1521                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1522                 if (s->ctx->psk_identity_hint != NULL)
1523                         OPENSSL_free(s->ctx->psk_identity_hint);
1524                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1525                 if (s->ctx->psk_identity_hint == NULL)
1526                         {
1527                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1528                         goto f_err;
1529                         }
1530
1531                 p+=i;
1532                 n-=param_len;
1533                 }
1534         else
1535 #endif /* !OPENSSL_NO_PSK */
1536 #ifndef OPENSSL_NO_SRP
1537         if (alg_k & SSL_kSRP)
1538                 {
1539                 n2s(p,i);
1540                 param_len=i+2;
1541                 if (param_len > n)
1542                         {
1543                         al=SSL_AD_DECODE_ERROR;
1544                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1545                         goto f_err;
1546                         }
1547                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1548                         {
1549                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1550                         goto err;
1551                         }
1552                 p+=i;
1553
1554                 n2s(p,i);
1555                 param_len+=i+2;
1556                 if (param_len > n)
1557                         {
1558                         al=SSL_AD_DECODE_ERROR;
1559                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1560                         goto f_err;
1561                         }
1562                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1565                         goto err;
1566                         }
1567                 p+=i;
1568
1569                 i = (unsigned int)(p[0]);
1570                 p++;
1571                 param_len+=i+1;
1572                 if (param_len > n)
1573                         {
1574                         al=SSL_AD_DECODE_ERROR;
1575                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1576                         goto f_err;
1577                         }
1578                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1581                         goto err;
1582                         }
1583                 p+=i;
1584
1585                 n2s(p,i);
1586                 param_len+=i+2;
1587                 if (param_len > n)
1588                         {
1589                         al=SSL_AD_DECODE_ERROR;
1590                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1591                         goto f_err;
1592                         }
1593                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1594                         {
1595                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1596                         goto err;
1597                         }
1598                 p+=i;
1599                 n-=param_len;
1600
1601 /* We must check if there is a certificate */
1602 #ifndef OPENSSL_NO_RSA
1603                 if (alg_a & SSL_aRSA)
1604                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1605 #else
1606                 if (0)
1607                         ;
1608 #endif
1609 #ifndef OPENSSL_NO_DSA
1610                 else if (alg_a & SSL_aDSS)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1612 #endif
1613                 }
1614         else
1615 #endif /* !OPENSSL_NO_SRP */
1616 #ifndef OPENSSL_NO_RSA
1617         if (alg_k & SSL_kRSA)
1618                 {
1619                 if ((rsa=RSA_new()) == NULL)
1620                         {
1621                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1622                         goto err;
1623                         }
1624                 n2s(p,i);
1625                 param_len=i+2;
1626                 if (param_len > n)
1627                         {
1628                         al=SSL_AD_DECODE_ERROR;
1629                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1630                         goto f_err;
1631                         }
1632                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1633                         {
1634                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1635                         goto err;
1636                         }
1637                 p+=i;
1638
1639                 n2s(p,i);
1640                 param_len+=i+2;
1641                 if (param_len > n)
1642                         {
1643                         al=SSL_AD_DECODE_ERROR;
1644                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1645                         goto f_err;
1646                         }
1647                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1650                         goto err;
1651                         }
1652                 p+=i;
1653                 n-=param_len;
1654
1655                 /* this should be because we are using an export cipher */
1656                 if (alg_a & SSL_aRSA)
1657                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1658                 else
1659                         {
1660                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1661                         goto err;
1662                         }
1663                 s->session->sess_cert->peer_rsa_tmp=rsa;
1664                 rsa=NULL;
1665                 }
1666 #else /* OPENSSL_NO_RSA */
1667         if (0)
1668                 ;
1669 #endif
1670 #ifndef OPENSSL_NO_DH
1671         else if (alg_k & SSL_kDHE)
1672                 {
1673                 if ((dh=DH_new()) == NULL)
1674                         {
1675                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1676                         goto err;
1677                         }
1678                 n2s(p,i);
1679                 param_len=i+2;
1680                 if (param_len > n)
1681                         {
1682                         al=SSL_AD_DECODE_ERROR;
1683                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1684                         goto f_err;
1685                         }
1686                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1687                         {
1688                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1689                         goto err;
1690                         }
1691                 p+=i;
1692
1693                 n2s(p,i);
1694                 param_len+=i+2;
1695                 if (param_len > n)
1696                         {
1697                         al=SSL_AD_DECODE_ERROR;
1698                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1699                         goto f_err;
1700                         }
1701                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1702                         {
1703                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1704                         goto err;
1705                         }
1706                 p+=i;
1707
1708                 n2s(p,i);
1709                 param_len+=i+2;
1710                 if (param_len > n)
1711                         {
1712                         al=SSL_AD_DECODE_ERROR;
1713                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1714                         goto f_err;
1715                         }
1716                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1717                         {
1718                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1719                         goto err;
1720                         }
1721                 p+=i;
1722                 n-=param_len;
1723
1724                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1725                                                 DH_security_bits(dh), 0, dh))
1726                         {
1727                         al=SSL_AD_HANDSHAKE_FAILURE;
1728                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1729                         goto f_err;
1730                         }
1731
1732 #ifndef OPENSSL_NO_RSA
1733                 if (alg_a & SSL_aRSA)
1734                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1735 #else
1736                 if (0)
1737                         ;
1738 #endif
1739 #ifndef OPENSSL_NO_DSA
1740                 else if (alg_a & SSL_aDSS)
1741                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1742 #endif
1743                 /* else anonymous DH, so no certificate or pkey. */
1744
1745                 s->session->sess_cert->peer_dh_tmp=dh;
1746                 dh=NULL;
1747                 }
1748         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1749                 {
1750                 al=SSL_AD_ILLEGAL_PARAMETER;
1751                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1752                 goto f_err;
1753                 }
1754 #endif /* !OPENSSL_NO_DH */
1755
1756 #ifndef OPENSSL_NO_ECDH
1757         else if (alg_k & SSL_kECDHE)
1758                 {
1759                 EC_GROUP *ngroup;
1760                 const EC_GROUP *group;
1761
1762                 if ((ecdh=EC_KEY_new()) == NULL)
1763                         {
1764                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1765                         goto err;
1766                         }
1767
1768                 /* Extract elliptic curve parameters and the
1769                  * server's ephemeral ECDH public key.
1770                  * Keep accumulating lengths of various components in
1771                  * param_len and make sure it never exceeds n.
1772                  */
1773
1774                 /* XXX: For now we only support named (not generic) curves
1775                  * and the ECParameters in this case is just three bytes.
1776                  */
1777                 param_len=3;
1778                 /* Check curve is one of our preferences, if not server has
1779                  * sent an invalid curve.
1780                  */
1781                 if (!tls1_check_curve(s, p, param_len))
1782                         {
1783                         al=SSL_AD_DECODE_ERROR;
1784                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1785                         goto f_err;
1786                         }
1787
1788                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1789                         {
1790                         al=SSL_AD_INTERNAL_ERROR;
1791                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1792                         goto f_err;
1793                         }
1794
1795                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1796                 if (ngroup == NULL)
1797                         {
1798                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1799                         goto err;
1800                         }
1801                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1802                         {
1803                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1804                         goto err;
1805                         }
1806                 EC_GROUP_free(ngroup);
1807
1808                 group = EC_KEY_get0_group(ecdh);
1809
1810                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1811                     (EC_GROUP_get_degree(group) > 163))
1812                         {
1813                         al=SSL_AD_EXPORT_RESTRICTION;
1814                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1815                         goto f_err;
1816                         }
1817
1818                 p+=3;
1819
1820                 /* Next, get the encoded ECPoint */
1821                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1822                     ((bn_ctx = BN_CTX_new()) == NULL))
1823                         {
1824                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1825                         goto err;
1826                         }
1827
1828                 encoded_pt_len = *p;  /* length of encoded point */
1829                 p+=1;
1830                 param_len += (1 + encoded_pt_len);
1831                 if ((param_len > n) ||
1832                     (EC_POINT_oct2point(group, srvr_ecpoint,
1833                         p, encoded_pt_len, bn_ctx) == 0))
1834                         {
1835                         al=SSL_AD_DECODE_ERROR;
1836                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1837                         goto f_err;
1838                         }
1839
1840                 n-=param_len;
1841                 p+=encoded_pt_len;
1842
1843                 /* The ECC/TLS specification does not mention
1844                  * the use of DSA to sign ECParameters in the server
1845                  * key exchange message. We do support RSA and ECDSA.
1846                  */
1847                 if (0) ;
1848 #ifndef OPENSSL_NO_RSA
1849                 else if (alg_a & SSL_aRSA)
1850                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1851 #endif
1852 #ifndef OPENSSL_NO_ECDSA
1853                 else if (alg_a & SSL_aECDSA)
1854                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1855 #endif
1856                 /* else anonymous ECDH, so no certificate or pkey. */
1857                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1858                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1859                 ecdh=NULL;
1860                 BN_CTX_free(bn_ctx);
1861                 bn_ctx = NULL;
1862                 EC_POINT_free(srvr_ecpoint);
1863                 srvr_ecpoint = NULL;
1864                 }
1865         else if (alg_k)
1866                 {
1867                 al=SSL_AD_UNEXPECTED_MESSAGE;
1868                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1869                 goto f_err;
1870                 }
1871 #endif /* !OPENSSL_NO_ECDH */
1872
1873
1874         /* p points to the next byte, there are 'n' bytes left */
1875
1876         /* if it was signed, check the signature */
1877         if (pkey != NULL)
1878                 {
1879                 if (SSL_USE_SIGALGS(s))
1880                         {
1881                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1882                         if (rv == -1)
1883                                 goto err;
1884                         else if (rv == 0)
1885                                 {
1886                                 al = SSL_AD_DECODE_ERROR;
1887                                 goto f_err;
1888                                 }
1889 #ifdef SSL_DEBUG
1890 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1891 #endif
1892                         p += 2;
1893                         n -= 2;
1894                         }
1895                 else
1896                         md = EVP_sha1();
1897
1898                 n2s(p,i);
1899                 n-=2;
1900                 j=EVP_PKEY_size(pkey);
1901
1902                 if ((i != n) || (n > j) || (n <= 0))
1903                         {
1904                         /* wrong packet length */
1905                         al=SSL_AD_DECODE_ERROR;
1906                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1907                         goto f_err;
1908                         }
1909
1910 #ifndef OPENSSL_NO_RSA
1911                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1912                         {
1913                         int num;
1914
1915                         j=0;
1916                         q=md_buf;
1917                         for (num=2; num > 0; num--)
1918                                 {
1919                                 EVP_MD_CTX_set_flags(&md_ctx,
1920                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1921                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1922                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1923                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1924                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1925                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1926                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1927                                 q+=i;
1928                                 j+=i;
1929                                 }
1930                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1931                                                                 pkey->pkey.rsa);
1932                         if (i < 0)
1933                                 {
1934                                 al=SSL_AD_DECRYPT_ERROR;
1935                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1936                                 goto f_err;
1937                                 }
1938                         if (i == 0)
1939                                 {
1940                                 /* bad signature */
1941                                 al=SSL_AD_DECRYPT_ERROR;
1942                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1943                                 goto f_err;
1944                                 }
1945                         }
1946                 else
1947 #endif
1948                         {
1949                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1950                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1951                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1952                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1953                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1954                                 {
1955                                 /* bad signature */
1956                                 al=SSL_AD_DECRYPT_ERROR;
1957                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1958                                 goto f_err;
1959                                 }
1960                         }
1961                 }
1962         else
1963                 {
1964                 /* aNULL or kPSK do not need public keys */
1965                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1966                         {
1967                         /* Might be wrong key type, check it */
1968                         if (ssl3_check_cert_and_algorithm(s))
1969                                 /* Otherwise this shouldn't happen */
1970                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1971                         goto err;
1972                         }
1973                 /* still data left over */
1974                 if (n != 0)
1975                         {
1976                         al=SSL_AD_DECODE_ERROR;
1977                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1978                         goto f_err;
1979                         }
1980                 }
1981         EVP_PKEY_free(pkey);
1982         EVP_MD_CTX_cleanup(&md_ctx);
1983         return(1);
1984 f_err:
1985         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1986 err:
1987         EVP_PKEY_free(pkey);
1988 #ifndef OPENSSL_NO_RSA
1989         if (rsa != NULL)
1990                 RSA_free(rsa);
1991 #endif
1992 #ifndef OPENSSL_NO_DH
1993         if (dh != NULL)
1994                 DH_free(dh);
1995 #endif
1996 #ifndef OPENSSL_NO_ECDH
1997         BN_CTX_free(bn_ctx);
1998         EC_POINT_free(srvr_ecpoint);
1999         if (ecdh != NULL)
2000                 EC_KEY_free(ecdh);
2001 #endif
2002         EVP_MD_CTX_cleanup(&md_ctx);
2003         return(-1);
2004         }
2005
2006 int ssl3_get_certificate_request(SSL *s)
2007         {
2008         int ok,ret=0;
2009         unsigned long n,nc,l;
2010         unsigned int llen, ctype_num,i;
2011         X509_NAME *xn=NULL;
2012         const unsigned char *p,*q;
2013         unsigned char *d;
2014         STACK_OF(X509_NAME) *ca_sk=NULL;
2015
2016         n=s->method->ssl_get_message(s,
2017                 SSL3_ST_CR_CERT_REQ_A,
2018                 SSL3_ST_CR_CERT_REQ_B,
2019                 -1,
2020                 s->max_cert_list,
2021                 &ok);
2022
2023         if (!ok) return((int)n);
2024
2025         s->s3->tmp.cert_req=0;
2026
2027         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2028                 {
2029                 s->s3->tmp.reuse_message=1;
2030                 /* If we get here we don't need any cached handshake records
2031                  * as we wont be doing client auth.
2032                  */
2033                 if (s->s3->handshake_buffer)
2034                         {
2035                         if (!ssl3_digest_cached_records(s))
2036                                 goto err;
2037                         }
2038                 return(1);
2039                 }
2040
2041         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2042                 {
2043                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2044                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2045                 goto err;
2046                 }
2047
2048         /* TLS does not like anon-DH with client cert */
2049         if (s->version > SSL3_VERSION)
2050                 {
2051                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2052                         {
2053                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2054                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2055                         goto err;
2056                         }
2057                 }
2058
2059         p=d=(unsigned char *)s->init_msg;
2060
2061         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2062                 {
2063                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2064                 goto err;
2065                 }
2066
2067         /* get the certificate types */
2068         ctype_num= *(p++);
2069         if (s->cert->ctypes)
2070                 {
2071                 OPENSSL_free(s->cert->ctypes);
2072                 s->cert->ctypes = NULL;
2073                 }
2074         if (ctype_num > SSL3_CT_NUMBER)
2075                 {
2076                 /* If we exceed static buffer copy all to cert structure */
2077                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2078                 memcpy(s->cert->ctypes, p, ctype_num);
2079                 s->cert->ctype_num = (size_t)ctype_num;
2080                 ctype_num=SSL3_CT_NUMBER;
2081                 }
2082         for (i=0; i<ctype_num; i++)
2083                 s->s3->tmp.ctype[i]= p[i];
2084         p+=p[-1];
2085         if (SSL_USE_SIGALGS(s))
2086                 {
2087                 n2s(p, llen);
2088                 /* Check we have enough room for signature algorithms and
2089                  * following length value.
2090                  */
2091                 if ((unsigned long)(p - d + llen + 2) > n)
2092                         {
2093                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2094                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2095                         goto err;
2096                         }
2097                 /* Clear certificate digests and validity flags */
2098                 for (i = 0; i < SSL_PKEY_NUM; i++)
2099                         {
2100                         s->cert->pkeys[i].digest = NULL;
2101                         s->cert->pkeys[i].valid_flags = 0;
2102                         }
2103                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2104                         {
2105                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2106                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2107                         goto err;
2108                         }
2109                 p += llen;
2110                 }
2111
2112         /* get the CA RDNs */
2113         n2s(p,llen);
2114 #if 0
2115 {
2116 FILE *out;
2117 out=fopen("/tmp/vsign.der","w");
2118 fwrite(p,1,llen,out);
2119 fclose(out);
2120 }
2121 #endif
2122
2123         if ((unsigned long)(p - d + llen) != n)
2124                 {
2125                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2126                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2127                 goto err;
2128                 }
2129
2130         for (nc=0; nc<llen; )
2131                 {
2132                 n2s(p,l);
2133                 if ((l+nc+2) > llen)
2134                         {
2135                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2136                                 goto cont; /* netscape bugs */
2137                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2138                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2139                         goto err;
2140                         }
2141
2142                 q=p;
2143
2144                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2145                         {
2146                         /* If netscape tolerance is on, ignore errors */
2147                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2148                                 goto cont;
2149                         else
2150                                 {
2151                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2152                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2153                                 goto err;
2154                                 }
2155                         }
2156
2157                 if (q != (p+l))
2158                         {
2159                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2160                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2161                         goto err;
2162                         }
2163                 if (!sk_X509_NAME_push(ca_sk,xn))
2164                         {
2165                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2166                         goto err;
2167                         }
2168
2169                 p+=l;
2170                 nc+=l+2;
2171                 }
2172
2173         if (0)
2174                 {
2175 cont:
2176                 ERR_clear_error();
2177                 }
2178
2179         /* we should setup a certificate to return.... */
2180         s->s3->tmp.cert_req=1;
2181         s->s3->tmp.ctype_num=ctype_num;
2182         if (s->s3->tmp.ca_names != NULL)
2183                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2184         s->s3->tmp.ca_names=ca_sk;
2185         ca_sk=NULL;
2186
2187         ret=1;
2188 err:
2189         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2190         return(ret);
2191         }
2192
2193 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2194         {
2195         return(X509_NAME_cmp(*a,*b));
2196         }
2197 #ifndef OPENSSL_NO_TLSEXT
2198 int ssl3_get_new_session_ticket(SSL *s)
2199         {
2200         int ok,al,ret=0, ticklen;
2201         long n;
2202         const unsigned char *p;
2203         unsigned char *d;
2204
2205         n=s->method->ssl_get_message(s,
2206                 SSL3_ST_CR_SESSION_TICKET_A,
2207                 SSL3_ST_CR_SESSION_TICKET_B,
2208                 -1,
2209                 16384,
2210                 &ok);
2211
2212         if (!ok)
2213                 return((int)n);
2214
2215         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2216                 {
2217                 s->s3->tmp.reuse_message=1;
2218                 return(1);
2219                 }
2220         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2221                 {
2222                 al=SSL_AD_UNEXPECTED_MESSAGE;
2223                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2224                 goto f_err;
2225                 }
2226         if (n < 6)
2227                 {
2228                 /* need at least ticket_lifetime_hint + ticket length */
2229                 al = SSL_AD_DECODE_ERROR;
2230                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2231                 goto f_err;
2232                 }
2233
2234         p=d=(unsigned char *)s->init_msg;
2235         n2l(p, s->session->tlsext_tick_lifetime_hint);
2236         n2s(p, ticklen);
2237         /* ticket_lifetime_hint + ticket_length + ticket */
2238         if (ticklen + 6 != n)
2239                 {
2240                 al = SSL_AD_DECODE_ERROR;
2241                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2242                 goto f_err;
2243                 }
2244         if (s->session->tlsext_tick)
2245                 {
2246                 OPENSSL_free(s->session->tlsext_tick);
2247                 s->session->tlsext_ticklen = 0;
2248                 }
2249         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2250         if (!s->session->tlsext_tick)
2251                 {
2252                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2253                 goto err;
2254                 }
2255         memcpy(s->session->tlsext_tick, p, ticklen);
2256         s->session->tlsext_ticklen = ticklen;
2257         /* There are two ways to detect a resumed ticket sesion.
2258          * One is to set an appropriate session ID and then the server
2259          * must return a match in ServerHello. This allows the normal
2260          * client session ID matching to work and we know much
2261          * earlier that the ticket has been accepted.
2262          *
2263          * The other way is to set zero length session ID when the
2264          * ticket is presented and rely on the handshake to determine
2265          * session resumption.
2266          *
2267          * We choose the former approach because this fits in with
2268          * assumptions elsewhere in OpenSSL. The session ID is set
2269          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2270          * ticket.
2271          */
2272         EVP_Digest(p, ticklen,
2273                         s->session->session_id, &s->session->session_id_length,
2274 #ifndef OPENSSL_NO_SHA256
2275                                                         EVP_sha256(), NULL);
2276 #else
2277                                                         EVP_sha1(), NULL);
2278 #endif
2279         ret=1;
2280         return(ret);
2281 f_err:
2282         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2283 err:
2284         return(-1);
2285         }
2286
2287 int ssl3_get_cert_status(SSL *s)
2288         {
2289         int ok, al;
2290         unsigned long resplen,n;
2291         const unsigned char *p;
2292
2293         n=s->method->ssl_get_message(s,
2294                 SSL3_ST_CR_CERT_STATUS_A,
2295                 SSL3_ST_CR_CERT_STATUS_B,
2296                 SSL3_MT_CERTIFICATE_STATUS,
2297                 16384,
2298                 &ok);
2299
2300         if (!ok) return((int)n);
2301         if (n < 4)
2302                 {
2303                 /* need at least status type + length */
2304                 al = SSL_AD_DECODE_ERROR;
2305                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2306                 goto f_err;
2307                 }
2308         p = (unsigned char *)s->init_msg;
2309         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2310                 {
2311                 al = SSL_AD_DECODE_ERROR;
2312                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2313                 goto f_err;
2314                 }
2315         n2l3(p, resplen);
2316         if (resplen + 4 != n)
2317                 {
2318                 al = SSL_AD_DECODE_ERROR;
2319                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2320                 goto f_err;
2321                 }
2322         if (s->tlsext_ocsp_resp)
2323                 OPENSSL_free(s->tlsext_ocsp_resp);
2324         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2325         if (!s->tlsext_ocsp_resp)
2326                 {
2327                 al = SSL_AD_INTERNAL_ERROR;
2328                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2329                 goto f_err;
2330                 }
2331         s->tlsext_ocsp_resplen = resplen;
2332         if (s->ctx->tlsext_status_cb)
2333                 {
2334                 int ret;
2335                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2336                 if (ret == 0)
2337                         {
2338                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2339                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2340                         goto f_err;
2341                         }
2342                 if (ret < 0)
2343                         {
2344                         al = SSL_AD_INTERNAL_ERROR;
2345                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2346                         goto f_err;
2347                         }
2348                 }
2349         return 1;
2350 f_err:
2351         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2352         return(-1);
2353         }
2354 #endif
2355
2356 int ssl3_get_server_done(SSL *s)
2357         {
2358         int ok,ret=0;
2359         long n;
2360
2361         n=s->method->ssl_get_message(s,
2362                 SSL3_ST_CR_SRVR_DONE_A,
2363                 SSL3_ST_CR_SRVR_DONE_B,
2364                 SSL3_MT_SERVER_DONE,
2365                 30, /* should be very small, like 0 :-) */
2366                 &ok);
2367
2368         if (!ok) return((int)n);
2369         if (n > 0)
2370                 {
2371                 /* should contain no data */
2372                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2373                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2374                 return -1;
2375                 }
2376         ret=1;
2377         return(ret);
2378         }
2379
2380
2381 int ssl3_send_client_key_exchange(SSL *s)
2382         {
2383         unsigned char *p;
2384         int n;
2385         unsigned long alg_k;
2386 #ifndef OPENSSL_NO_RSA
2387         unsigned char *q;
2388         EVP_PKEY *pkey=NULL;
2389 #endif
2390 #ifndef OPENSSL_NO_KRB5
2391         KSSL_ERR kssl_err;
2392 #endif /* OPENSSL_NO_KRB5 */
2393 #ifndef OPENSSL_NO_ECDH
2394         EC_KEY *clnt_ecdh = NULL;
2395         const EC_POINT *srvr_ecpoint = NULL;
2396         EVP_PKEY *srvr_pub_pkey = NULL;
2397         unsigned char *encodedPoint = NULL;
2398         int encoded_pt_len = 0;
2399         BN_CTX * bn_ctx = NULL;
2400 #endif
2401
2402         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2403                 {
2404                 p = ssl_handshake_start(s);
2405
2406                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2407
2408                 /* Fool emacs indentation */
2409                 if (0) {}
2410 #ifndef OPENSSL_NO_RSA
2411                 else if (alg_k & SSL_kRSA)
2412                         {
2413                         RSA *rsa;
2414                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2415
2416                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2417                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2418                         else
2419                                 {
2420                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2421                                 if ((pkey == NULL) ||
2422                                         (pkey->type != EVP_PKEY_RSA) ||
2423                                         (pkey->pkey.rsa == NULL))
2424                                         {
2425                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2426                                         goto err;
2427                                         }
2428                                 rsa=pkey->pkey.rsa;
2429                                 EVP_PKEY_free(pkey);
2430                                 }
2431
2432                         tmp_buf[0]=s->client_version>>8;
2433                         tmp_buf[1]=s->client_version&0xff;
2434                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2435                                         goto err;
2436
2437                         s->session->master_key_length=sizeof tmp_buf;
2438
2439                         q=p;
2440                         /* Fix buf for TLS and beyond */
2441                         if (s->version > SSL3_VERSION)
2442                                 p+=2;
2443                         n=RSA_public_encrypt(sizeof tmp_buf,
2444                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2445 #ifdef PKCS1_CHECK
2446                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2447                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2448 #endif
2449                         if (n <= 0)
2450                                 {
2451                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2452                                 goto err;
2453                                 }
2454
2455                         /* Fix buf for TLS and beyond */
2456                         if (s->version > SSL3_VERSION)
2457                                 {
2458                                 s2n(n,q);
2459                                 n+=2;
2460                                 }
2461
2462                         s->session->master_key_length=
2463                                 s->method->ssl3_enc->generate_master_secret(s,
2464                                         s->session->master_key,
2465                                         tmp_buf,sizeof tmp_buf);
2466                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2467                         }
2468 #endif
2469 #ifndef OPENSSL_NO_KRB5
2470                 else if (alg_k & SSL_kKRB5)
2471                         {
2472                         krb5_error_code krb5rc;
2473                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2474                         /*  krb5_data   krb5_ap_req;  */
2475                         krb5_data       *enc_ticket;
2476                         krb5_data       authenticator, *authp = NULL;
2477                         EVP_CIPHER_CTX  ciph_ctx;
2478                         const EVP_CIPHER *enc = NULL;
2479                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2480                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2481                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2482                                                 + EVP_MAX_IV_LENGTH];
2483                         int             padl, outl = sizeof(epms);
2484
2485                         EVP_CIPHER_CTX_init(&ciph_ctx);
2486
2487 #ifdef KSSL_DEBUG
2488                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2489                                 alg_k, SSL_kKRB5);
2490 #endif  /* KSSL_DEBUG */
2491
2492                         authp = NULL;
2493 #ifdef KRB5SENDAUTH
2494                         if (KRB5SENDAUTH)  authp = &authenticator;
2495 #endif  /* KRB5SENDAUTH */
2496
2497                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2498                                 &kssl_err);
2499                         enc = kssl_map_enc(kssl_ctx->enctype);
2500                         if (enc == NULL)
2501                             goto err;
2502 #ifdef KSSL_DEBUG
2503                         {
2504                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2505                         if (krb5rc && kssl_err.text)
2506                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2507                         }
2508 #endif  /* KSSL_DEBUG */
2509
2510                         if (krb5rc)
2511                                 {
2512                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2513                                                 SSL_AD_HANDSHAKE_FAILURE);
2514                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2515                                                 kssl_err.reason);
2516                                 goto err;
2517                                 }
2518
2519                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2520                         **  in place of RFC 2712 KerberosWrapper, as in:
2521                         **
2522                         **  Send ticket (copy to *p, set n = length)
2523                         **  n = krb5_ap_req.length;
2524                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2525                         **  if (krb5_ap_req.data)
2526                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2527                         **
2528                         **  Now using real RFC 2712 KerberosWrapper
2529                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2530                         **  Note: 2712 "opaque" types are here replaced
2531                         **  with a 2-byte length followed by the value.
2532                         **  Example:
2533                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2534                         **  Where "xx xx" = length bytes.  Shown here with
2535                         **  optional authenticator omitted.
2536                         */
2537
2538                         /*  KerberosWrapper.Ticket              */
2539                         s2n(enc_ticket->length,p);
2540                         memcpy(p, enc_ticket->data, enc_ticket->length);
2541                         p+= enc_ticket->length;
2542                         n = enc_ticket->length + 2;
2543
2544                         /*  KerberosWrapper.Authenticator       */
2545                         if (authp  &&  authp->length)
2546                                 {
2547                                 s2n(authp->length,p);
2548                                 memcpy(p, authp->data, authp->length);
2549                                 p+= authp->length;
2550                                 n+= authp->length + 2;
2551
2552                                 free(authp->data);
2553                                 authp->data = NULL;
2554                                 authp->length = 0;
2555                                 }
2556                         else
2557                                 {
2558                                 s2n(0,p);/*  null authenticator length  */
2559                                 n+=2;
2560                                 }
2561
2562                             tmp_buf[0]=s->client_version>>8;
2563                             tmp_buf[1]=s->client_version&0xff;
2564                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2565                                 goto err;
2566
2567                         /*  20010420 VRS.  Tried it this way; failed.
2568                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2569                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2570                         **                              kssl_ctx->length);
2571                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2572                         */
2573
2574                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2575                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2576                                 kssl_ctx->key,iv);
2577                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2578                                 sizeof tmp_buf);
2579                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2580                         outl += padl;
2581                         if (outl > (int)sizeof epms)
2582                                 {
2583                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2584                                 goto err;
2585                                 }
2586                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2587
2588                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2589                         s2n(outl,p);
2590                         memcpy(p, epms, outl);
2591                         p+=outl;
2592                         n+=outl + 2;
2593
2594                         s->session->master_key_length=
2595                                 s->method->ssl3_enc->generate_master_secret(s,
2596                                         s->session->master_key,
2597                                         tmp_buf, sizeof tmp_buf);
2598
2599                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2600                         OPENSSL_cleanse(epms, outl);
2601                         }
2602 #endif
2603 #ifndef OPENSSL_NO_DH
2604                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2605                         {
2606                         DH *dh_srvr,*dh_clnt;
2607                         SESS_CERT *scert = s->session->sess_cert;
2608
2609                         if (scert == NULL)
2610                                 {
2611                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2612                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2613                                 goto err;
2614                                 }
2615
2616                         if (scert->peer_dh_tmp != NULL)
2617                                 dh_srvr=scert->peer_dh_tmp;
2618                         else
2619                                 {
2620                                 /* we get them from the cert */
2621                                 int idx = scert->peer_cert_type;
2622                                 EVP_PKEY *spkey = NULL;
2623                                 dh_srvr = NULL;
2624                                 if (idx >= 0)
2625                                         spkey = X509_get_pubkey(
2626                                                 scert->peer_pkeys[idx].x509);
2627                                 if (spkey)
2628                                         {
2629                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2630                                         EVP_PKEY_free(spkey);
2631                                         }
2632                                 if (dh_srvr == NULL)
2633                                         {
2634                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2635                                             ERR_R_INTERNAL_ERROR);
2636                                         goto err;
2637                                         }
2638                                 }
2639                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2640                                 {
2641                                 /* Use client certificate key */
2642                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2643                                 dh_clnt = NULL;
2644                                 if (clkey)
2645                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2646                                 if (dh_clnt == NULL)
2647                                         {
2648                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2649                                             ERR_R_INTERNAL_ERROR);
2650                                         goto err;
2651                                         }
2652                                 }
2653                         else
2654                                 {
2655                                 /* generate a new random key */
2656                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2657                                         {
2658                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2659                                         goto err;
2660                                         }
2661                                 if (!DH_generate_key(dh_clnt))
2662                                         {
2663                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2664                                         DH_free(dh_clnt);
2665                                         goto err;
2666                                         }
2667                                 }
2668
2669                         /* use the 'p' output buffer for the DH key, but
2670                          * make sure to clear it out afterwards */
2671
2672                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2673                         if (scert->peer_dh_tmp == NULL)
2674                                 DH_free(dh_srvr);
2675
2676                         if (n <= 0)
2677                                 {
2678                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2679                                 DH_free(dh_clnt);
2680                                 goto err;
2681                                 }
2682
2683                         /* generate master key from the result */
2684                         s->session->master_key_length=
2685                                 s->method->ssl3_enc->generate_master_secret(s,
2686                                         s->session->master_key,p,n);
2687                         /* clean up */
2688                         memset(p,0,n);
2689
2690                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2691                                 n = 0;
2692                         else
2693                                 {
2694                                 /* send off the data */
2695                                 n=BN_num_bytes(dh_clnt->pub_key);
2696                                 s2n(n,p);
2697                                 BN_bn2bin(dh_clnt->pub_key,p);
2698                                 n+=2;
2699                                 }
2700
2701                         DH_free(dh_clnt);
2702
2703                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2704                         }
2705 #endif
2706
2707 #ifndef OPENSSL_NO_ECDH
2708                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2709                         {
2710                         const EC_GROUP *srvr_group = NULL;
2711                         EC_KEY *tkey;
2712                         int ecdh_clnt_cert = 0;
2713                         int field_size = 0;
2714
2715                         if (s->session->sess_cert == NULL)
2716                                 {
2717                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2718                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2719                                 goto err;
2720                                 }
2721
2722                         /* Did we send out the client's
2723                          * ECDH share for use in premaster
2724                          * computation as part of client certificate?
2725                          * If so, set ecdh_clnt_cert to 1.
2726                          */
2727                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2728                                 {
2729                                 /* XXX: For now, we do not support client
2730                                  * authentication using ECDH certificates.
2731                                  * To add such support, one needs to add
2732                                  * code that checks for appropriate
2733                                  * conditions and sets ecdh_clnt_cert to 1.
2734                                  * For example, the cert have an ECC
2735                                  * key on the same curve as the server's
2736                                  * and the key should be authorized for
2737                                  * key agreement.
2738                                  *
2739                                  * One also needs to add code in ssl3_connect
2740                                  * to skip sending the certificate verify
2741                                  * message.
2742                                  *
2743                                  * if ((s->cert->key->privatekey != NULL) &&
2744                                  *     (s->cert->key->privatekey->type ==
2745                                  *      EVP_PKEY_EC) && ...)
2746                                  * ecdh_clnt_cert = 1;
2747                                  */
2748                                 }
2749
2750                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2751                                 {
2752                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2753                                 }
2754                         else
2755                                 {
2756                                 /* Get the Server Public Key from Cert */
2757                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2758                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2759                                 if ((srvr_pub_pkey == NULL) ||
2760                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2761                                     (srvr_pub_pkey->pkey.ec == NULL))
2762                                         {
2763                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2764                                             ERR_R_INTERNAL_ERROR);
2765                                         goto err;
2766                                         }
2767
2768                                 tkey = srvr_pub_pkey->pkey.ec;
2769                                 }
2770
2771                         srvr_group   = EC_KEY_get0_group(tkey);
2772                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2773
2774                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2775                                 {
2776                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2777                                     ERR_R_INTERNAL_ERROR);
2778                                 goto err;
2779                                 }
2780
2781                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2784                                 goto err;
2785                                 }
2786
2787                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2788                                 {
2789                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2790                                 goto err;
2791                                 }
2792                         if (ecdh_clnt_cert)
2793                                 {
2794                                 /* Reuse key info from our certificate
2795                                  * We only need our private key to perform
2796                                  * the ECDH computation.
2797                                  */
2798                                 const BIGNUM *priv_key;
2799                                 tkey = s->cert->key->privatekey->pkey.ec;
2800                                 priv_key = EC_KEY_get0_private_key(tkey);
2801                                 if (priv_key == NULL)
2802                                         {
2803                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2804                                         goto err;
2805                                         }
2806                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2807                                         {
2808                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2809                                         goto err;
2810                                         }
2811                                 }
2812                         else
2813                                 {
2814                                 /* Generate a new ECDH key pair */
2815                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2816                                         {
2817                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2818                                         goto err;
2819                                         }
2820                                 }
2821
2822                         /* use the 'p' output buffer for the ECDH key, but
2823                          * make sure to clear it out afterwards
2824                          */
2825
2826                         field_size = EC_GROUP_get_degree(srvr_group);
2827                         if (field_size <= 0)
2828                                 {
2829                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2830                                        ERR_R_ECDH_LIB);
2831                                 goto err;
2832                                 }
2833                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2834                         if (n <= 0)
2835                                 {
2836                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2837                                        ERR_R_ECDH_LIB);
2838                                 goto err;
2839                                 }
2840
2841                         /* generate master key from the result */
2842                         s->session->master_key_length = s->method->ssl3_enc \
2843                             -> generate_master_secret(s,
2844                                 s->session->master_key,
2845                                 p, n);
2846
2847                         memset(p, 0, n); /* clean up */
2848
2849                         if (ecdh_clnt_cert)
2850                                 {
2851                                 /* Send empty client key exch message */
2852                                 n = 0;
2853                                 }
2854                         else
2855                                 {
2856                                 /* First check the size of encoding and
2857                                  * allocate memory accordingly.
2858                                  */
2859                                 encoded_pt_len =
2860                                     EC_POINT_point2oct(srvr_group,
2861                                         EC_KEY_get0_public_key(clnt_ecdh),
2862                                         POINT_CONVERSION_UNCOMPRESSED,
2863                                         NULL, 0, NULL);
2864
2865                                 encodedPoint = (unsigned char *)
2866                                     OPENSSL_malloc(encoded_pt_len *
2867                                         sizeof(unsigned char));
2868                                 bn_ctx = BN_CTX_new();
2869                                 if ((encodedPoint == NULL) ||
2870                                     (bn_ctx == NULL))
2871                                         {
2872                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2873                                         goto err;
2874                                         }
2875
2876                                 /* Encode the public key */
2877                                 n = EC_POINT_point2oct(srvr_group,
2878                                     EC_KEY_get0_public_key(clnt_ecdh),
2879                                     POINT_CONVERSION_UNCOMPRESSED,
2880                                     encodedPoint, encoded_pt_len, bn_ctx);
2881
2882                                 *p = n; /* length of encoded point */
2883                                 /* Encoded point will be copied here */
2884                                 p += 1;
2885                                 /* copy the point */
2886                                 memcpy((unsigned char *)p, encodedPoint, n);
2887                                 /* increment n to account for length field */
2888                                 n += 1;
2889                                 }
2890
2891                         /* Free allocated memory */
2892                         BN_CTX_free(bn_ctx);
2893                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2894                         if (clnt_ecdh != NULL)
2895                                  EC_KEY_free(clnt_ecdh);
2896                         EVP_PKEY_free(srvr_pub_pkey);
2897                         }
2898 #endif /* !OPENSSL_NO_ECDH */
2899                 else if (alg_k & SSL_kGOST)
2900                         {
2901                         /* GOST key exchange message creation */
2902                         EVP_PKEY_CTX *pkey_ctx;
2903                         X509 *peer_cert;
2904                         size_t msglen;
2905                         unsigned int md_len;
2906                         int keytype;
2907                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2908                         EVP_MD_CTX *ukm_hash;
2909                         EVP_PKEY *pub_key;
2910
2911                         /* Get server sertificate PKEY and create ctx from it */
2912                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2913                         if (!peer_cert)
2914                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2915                         if (!peer_cert)         {
2916                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2917                                         goto err;
2918                                 }
2919
2920                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2921                         /* If we have send a certificate, and certificate key
2922
2923                          * parameters match those of server certificate, use
2924                          * certificate key for key exchange
2925                          */
2926
2927                          /* Otherwise, generate ephemeral key pair */
2928
2929                         EVP_PKEY_encrypt_init(pkey_ctx);
2930                           /* Generate session key */
2931                     RAND_bytes(premaster_secret,32);
2932                         /* If we have client certificate, use its secret as peer key */
2933                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2934                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2935                                         /* If there was an error - just ignore it. Ephemeral key
2936                                         * would be used
2937                                         */
2938                                         ERR_clear_error();
2939                                 }
2940                         }
2941                         /* Compute shared IV and store it in algorithm-specific
2942                          * context data */
2943                         ukm_hash = EVP_MD_CTX_create();
2944                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2945                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2946                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2947                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2948                         EVP_MD_CTX_destroy(ukm_hash);
2949                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2950                                 8,shared_ukm)<0) {
2951                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2952                                                 SSL_R_LIBRARY_BUG);
2953                                         goto err;
2954                                 }
2955                         /* Make GOST keytransport blob message */
2956                         /*Encapsulate it into sequence */
2957                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2958                         msglen=255;
2959                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2960                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2961                                         SSL_R_LIBRARY_BUG);
2962                                 goto err;
2963                         }
2964                         if (msglen >= 0x80)
2965                                 {
2966                                 *(p++)=0x81;
2967                                 *(p++)= msglen & 0xff;
2968                                 n=msglen+3;
2969                                 }
2970                         else
2971                                 {
2972                                 *(p++)= msglen & 0xff;
2973                                 n=msglen+2;
2974                                 }
2975                         memcpy(p, tmp, msglen);
2976                         /* Check if pubkey from client certificate was used */
2977                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2978                                 {
2979                                 /* Set flag "skip certificate verify" */
2980                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2981                                 }
2982                         EVP_PKEY_CTX_free(pkey_ctx);
2983                         s->session->master_key_length=
2984                                 s->method->ssl3_enc->generate_master_secret(s,
2985                                         s->session->master_key,premaster_secret,32);
2986                         EVP_PKEY_free(pub_key);
2987
2988                         }
2989 #ifndef OPENSSL_NO_SRP
2990                 else if (alg_k & SSL_kSRP)
2991                         {
2992                         if (s->srp_ctx.A != NULL)
2993                                 {
2994                                 /* send off the data */
2995                                 n=BN_num_bytes(s->srp_ctx.A);
2996                                 s2n(n,p);
2997                                 BN_bn2bin(s->srp_ctx.A,p);
2998                                 n+=2;
2999                                 }
3000                         else
3001                                 {
3002                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3003                                 goto err;
3004                                 }
3005                         if (s->session->srp_username != NULL)
3006                                 OPENSSL_free(s->session->srp_username);
3007                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3008                         if (s->session->srp_username == NULL)
3009                                 {
3010                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3011                                         ERR_R_MALLOC_FAILURE);
3012                                 goto err;
3013                                 }
3014
3015                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3016                                 {
3017                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3018                                 goto err;
3019                                 }
3020                         }
3021 #endif
3022 #ifndef OPENSSL_NO_PSK
3023                 else if (alg_k & SSL_kPSK)
3024                         {
3025                         char identity[PSK_MAX_IDENTITY_LEN];
3026                         unsigned char *t = NULL;
3027                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3028                         unsigned int pre_ms_len = 0, psk_len = 0;
3029                         int psk_err = 1;
3030
3031                         n = 0;
3032                         if (s->psk_client_callback == NULL)
3033                                 {
3034                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3035                                         SSL_R_PSK_NO_CLIENT_CB);
3036                                 goto err;
3037                                 }
3038
3039                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3040                                 identity, PSK_MAX_IDENTITY_LEN,
3041                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3042                         if (psk_len > PSK_MAX_PSK_LEN)
3043                                 {
3044                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3045                                         ERR_R_INTERNAL_ERROR);
3046                                 goto psk_err;
3047                                 }
3048                         else if (psk_len == 0)
3049                                 {
3050                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3051                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3052                                 goto psk_err;
3053                                 }
3054
3055                         /* create PSK pre_master_secret */
3056                         pre_ms_len = 2+psk_len+2+psk_len;
3057                         t = psk_or_pre_ms;
3058                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3059                         s2n(psk_len, t);
3060                         memset(t, 0, psk_len);
3061                         t+=psk_len;
3062                         s2n(psk_len, t);
3063
3064                         if (s->session->psk_identity_hint != NULL)
3065                                 OPENSSL_free(s->session->psk_identity_hint);
3066                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3067                         if (s->ctx->psk_identity_hint != NULL &&
3068                                 s->session->psk_identity_hint == NULL)
3069                                 {
3070                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3071                                         ERR_R_MALLOC_FAILURE);
3072                                 goto psk_err;
3073                                 }
3074
3075                         if (s->session->psk_identity != NULL)
3076                                 OPENSSL_free(s->session->psk_identity);
3077                         s->session->psk_identity = BUF_strdup(identity);
3078                         if (s->session->psk_identity == NULL)
3079                                 {
3080                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3081                                         ERR_R_MALLOC_FAILURE);
3082                                 goto psk_err;
3083                                 }
3084
3085                         s->session->master_key_length =
3086                                 s->method->ssl3_enc->generate_master_secret(s,
3087                                         s->session->master_key,
3088                                         psk_or_pre_ms, pre_ms_len);
3089                         n = strlen(identity);
3090                         s2n(n, p);
3091                         memcpy(p, identity, n);
3092                         n+=2;
3093                         psk_err = 0;
3094                 psk_err:
3095                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
3096                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3097                         if (psk_err != 0)
3098                                 {
3099                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3100                                 goto err;
3101                                 }
3102                         }
3103 #endif
3104                 else
3105                         {
3106                         ssl3_send_alert(s, SSL3_AL_FATAL,
3107                             SSL_AD_HANDSHAKE_FAILURE);
3108                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3109                             ERR_R_INTERNAL_ERROR);
3110                         goto err;
3111                         }
3112
3113                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3114                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3115                 }
3116
3117         /* SSL3_ST_CW_KEY_EXCH_B */
3118         return ssl_do_write(s);
3119 err:
3120 #ifndef OPENSSL_NO_ECDH
3121         BN_CTX_free(bn_ctx);
3122         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3123         if (clnt_ecdh != NULL)
3124                 EC_KEY_free(clnt_ecdh);
3125         EVP_PKEY_free(srvr_pub_pkey);
3126 #endif
3127         return(-1);
3128         }
3129
3130 int ssl3_send_client_verify(SSL *s)
3131         {
3132         unsigned char *p;
3133         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3134         EVP_PKEY *pkey;
3135         EVP_PKEY_CTX *pctx=NULL;
3136         EVP_MD_CTX mctx;
3137         unsigned u=0;
3138         unsigned long n;
3139         int j;
3140
3141         EVP_MD_CTX_init(&mctx);
3142
3143         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3144                 {
3145                 p= ssl_handshake_start(s);
3146                 pkey=s->cert->key->privatekey;
3147 /* Create context from key and test if sha1 is allowed as digest */
3148                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3149                 EVP_PKEY_sign_init(pctx);
3150                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3151                         {
3152                         if (!SSL_USE_SIGALGS(s))
3153                                 s->method->ssl3_enc->cert_verify_mac(s,
3154                                                 NID_sha1,
3155                                                 &(data[MD5_DIGEST_LENGTH]));
3156                         }
3157                 else
3158                         {
3159                         ERR_clear_error();
3160                         }
3161                 /* For TLS v1.2 send signature algorithm and signature
3162                  * using agreed digest and cached handshake records.
3163                  */
3164                 if (SSL_USE_SIGALGS(s))
3165                         {
3166                         long hdatalen = 0;
3167                         void *hdata;
3168                         const EVP_MD *md = s->cert->key->digest;
3169                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3170                                                                 &hdata);
3171                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3172                                 {
3173                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3174                                                 ERR_R_INTERNAL_ERROR);
3175                                 goto err;
3176                                 }
3177                         p += 2;
3178 #ifdef SSL_DEBUG
3179                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3180                                                         EVP_MD_name(md));
3181 #endif
3182                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3183                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3184                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3185                                 {
3186                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3187                                                 ERR_R_EVP_LIB);
3188                                 goto err;
3189                                 }
3190                         s2n(u,p);
3191                         n = u + 4;
3192                         if (!ssl3_digest_cached_records(s))
3193                                 goto err;
3194                         }
3195                 else
3196 #ifndef OPENSSL_NO_RSA
3197                 if (pkey->type == EVP_PKEY_RSA)
3198                         {
3199                         s->method->ssl3_enc->cert_verify_mac(s,
3200                                 NID_md5,
3201                                 &(data[0]));
3202                         if (RSA_sign(NID_md5_sha1, data,
3203                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3204                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3205                                 {
3206                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3207                                 goto err;
3208                                 }
3209                         s2n(u,p);
3210                         n=u+2;
3211                         }
3212                 else
3213 #endif
3214 #ifndef OPENSSL_NO_DSA
3215                         if (pkey->type == EVP_PKEY_DSA)
3216                         {
3217                         if (!DSA_sign(pkey->save_type,
3218                                 &(data[MD5_DIGEST_LENGTH]),
3219                                 SHA_DIGEST_LENGTH,&(p[2]),
3220                                 (unsigned int *)&j,pkey->pkey.dsa))
3221                                 {
3222                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3223                                 goto err;
3224                                 }
3225                         s2n(j,p);
3226                         n=j+2;
3227                         }
3228                 else
3229 #endif
3230 #ifndef OPENSSL_NO_ECDSA
3231                         if (pkey->type == EVP_PKEY_EC)
3232                         {
3233                         if (!ECDSA_sign(pkey->save_type,
3234                                 &(data[MD5_DIGEST_LENGTH]),
3235                                 SHA_DIGEST_LENGTH,&(p[2]),
3236                                 (unsigned int *)&j,pkey->pkey.ec))
3237                                 {
3238                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3239                                     ERR_R_ECDSA_LIB);
3240                                 goto err;
3241                                 }
3242                         s2n(j,p);
3243                         n=j+2;
3244                         }
3245                 else
3246 #endif
3247                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3248                 {
3249                 unsigned char signbuf[64];
3250                 int i;
3251                 size_t sigsize=64;
3252                 s->method->ssl3_enc->cert_verify_mac(s,
3253                         NID_id_GostR3411_94,
3254                         data);
3255                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3256                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3257                         ERR_R_INTERNAL_ERROR);
3258                         goto err;
3259                 }
3260                 for (i=63,j=0; i>=0; j++, i--) {
3261                         p[2+j]=signbuf[i];
3262                 }
3263                 s2n(j,p);
3264                 n=j+2;
3265                 }
3266                 else
3267                 {
3268                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3269                         goto err;
3270                 }
3271                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3272                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3273                 }
3274         EVP_MD_CTX_cleanup(&mctx);
3275         EVP_PKEY_CTX_free(pctx);
3276         return ssl_do_write(s);
3277 err:
3278         EVP_MD_CTX_cleanup(&mctx);
3279         EVP_PKEY_CTX_free(pctx);
3280         return(-1);
3281         }
3282
3283 /* Check a certificate can be used for client authentication. Currently
3284  * check cert exists, if we have a suitable digest for TLS 1.2 if
3285  * static DH client certificates can be used and optionally checks
3286  * suitability for Suite B.
3287  */
3288 static int ssl3_check_client_certificate(SSL *s)
3289         {
3290         unsigned long alg_k;
3291         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3292                 return 0;
3293         /* If no suitable signature algorithm can't use certificate */
3294         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3295                 return 0;
3296         /* If strict mode check suitability of chain before using it.
3297          * This also adjusts suite B digest if necessary.
3298          */
3299         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3300                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3301                 return 0;
3302         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3303         /* See if we can use client certificate for fixed DH */
3304         if (alg_k & (SSL_kDHr|SSL_kDHd))
3305                 {
3306                 SESS_CERT *scert = s->session->sess_cert;
3307                 int i = scert->peer_cert_type;
3308                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3309                 clkey = s->cert->key->privatekey;
3310                 /* If client key not DH assume it can be used */
3311                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3312                         return 1;
3313                 if (i >= 0)
3314                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3315                 if (spkey)
3316                         {
3317                         /* Compare server and client parameters */
3318                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3319                         EVP_PKEY_free(spkey);
3320                         if (i != 1)
3321                                 return 0;
3322                         }
3323                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3324                 }
3325         return 1;
3326         }
3327
3328 int ssl3_send_client_certificate(SSL *s)
3329         {
3330         X509 *x509=NULL;
3331         EVP_PKEY *pkey=NULL;
3332         int i;
3333
3334         if (s->state == SSL3_ST_CW_CERT_A)
3335                 {
3336                 /* Let cert callback update client certificates if required */
3337                 if (s->cert->cert_cb)
3338                         {
3339                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3340                         if (i < 0)
3341                                 {
3342                                 s->rwstate=SSL_X509_LOOKUP;
3343                                 return -1;
3344                                 }
3345                         if (i == 0)
3346                                 {
3347                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3348                                 return 0;
3349                                 }
3350                         s->rwstate=SSL_NOTHING;
3351                         }
3352                 if (ssl3_check_client_certificate(s))
3353                         s->state=SSL3_ST_CW_CERT_C;
3354                 else
3355                         s->state=SSL3_ST_CW_CERT_B;
3356                 }
3357
3358         /* We need to get a client cert */
3359         if (s->state == SSL3_ST_CW_CERT_B)
3360                 {
3361                 /* If we get an error, we need to
3362                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3363                  * We then get retied later */
3364                 i=0;
3365                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3366                 if (i < 0)
3367                         {
3368                         s->rwstate=SSL_X509_LOOKUP;
3369                         return(-1);
3370                         }
3371                 s->rwstate=SSL_NOTHING;
3372                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3373                         {
3374                         s->state=SSL3_ST_CW_CERT_B;
3375                         if (    !SSL_use_certificate(s,x509) ||
3376                                 !SSL_use_PrivateKey(s,pkey))
3377                                 i=0;
3378                         }
3379                 else if (i == 1)
3380                         {
3381                         i=0;
3382                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3383                         }
3384
3385                 if (x509 != NULL) X509_free(x509);
3386                 if (pkey != NULL) EVP_PKEY_free(pkey);
3387                 if (i && !ssl3_check_client_certificate(s))
3388                         i = 0;
3389                 if (i == 0)
3390                         {
3391                         if (s->version == SSL3_VERSION)
3392                                 {
3393                                 s->s3->tmp.cert_req=0;
3394                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3395                                 return(1);
3396                                 }
3397                         else
3398                                 {
3399                                 s->s3->tmp.cert_req=2;
3400                                 }
3401                         }
3402
3403                 /* Ok, we have a cert */
3404                 s->state=SSL3_ST_CW_CERT_C;
3405                 }
3406
3407         if (s->state == SSL3_ST_CW_CERT_C)
3408                 {
3409                 s->state=SSL3_ST_CW_CERT_D;
3410                 if (!ssl3_output_cert_chain(s,
3411                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3412                         {
3413                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3414                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3415                         return 0;
3416                         }
3417                 }
3418         /* SSL3_ST_CW_CERT_D */
3419         return ssl_do_write(s);
3420         }
3421
3422 #define has_bits(i,m)   (((i)&(m)) == (m))
3423
3424 int ssl3_check_cert_and_algorithm(SSL *s)
3425         {
3426         int i,idx;
3427         long alg_k,alg_a;
3428         EVP_PKEY *pkey=NULL;
3429         SESS_CERT *sc;
3430 #ifndef OPENSSL_NO_RSA
3431         RSA *rsa;
3432 #endif
3433 #ifndef OPENSSL_NO_DH
3434         DH *dh;
3435 #endif
3436
3437         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3438         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3439
3440         /* we don't have a certificate */
3441         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3442                 return(1);
3443
3444         sc=s->session->sess_cert;
3445         if (sc == NULL)
3446                 {
3447                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3448                 goto err;
3449                 }
3450
3451 #ifndef OPENSSL_NO_RSA
3452         rsa=s->session->sess_cert->peer_rsa_tmp;
3453 #endif
3454 #ifndef OPENSSL_NO_DH
3455         dh=s->session->sess_cert->peer_dh_tmp;
3456 #endif
3457
3458         /* This is the passed certificate */
3459
3460         idx=sc->peer_cert_type;
3461 #ifndef OPENSSL_NO_ECDH
3462         if (idx == SSL_PKEY_ECC)
3463                 {
3464                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3465                                                                 s) == 0)
3466                         { /* check failed */
3467                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3468                         goto f_err;
3469                         }
3470                 else
3471                         {
3472                         return 1;
3473                         }
3474                 }
3475         else if (alg_a & SSL_aECDSA)
3476                 {
3477                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3478                 goto f_err;
3479                 }
3480         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3481                 {
3482                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3483                 goto f_err;
3484                 }
3485 #endif
3486         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3487         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3488         EVP_PKEY_free(pkey);
3489
3490
3491         /* Check that we have a certificate if we require one */
3492         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3493                 {
3494                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3495                 goto f_err;
3496                 }
3497 #ifndef OPENSSL_NO_DSA
3498         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3499                 {
3500                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3501                 goto f_err;
3502                 }
3503 #endif
3504 #ifndef OPENSSL_NO_RSA
3505         if ((alg_k & SSL_kRSA) &&
3506                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3507                 {
3508                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3509                 goto f_err;
3510                 }
3511 #endif
3512 #ifndef OPENSSL_NO_DH
3513         if ((alg_k & SSL_kDHE) &&
3514                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3515                 {
3516                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3517                 goto f_err;
3518                 }
3519         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3520                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3521                 {
3522                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3523                 goto f_err;
3524                 }
3525 #ifndef OPENSSL_NO_DSA
3526         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3527                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3528                 {
3529                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3530                 goto f_err;
3531                 }
3532 #endif
3533 #endif
3534
3535         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3536                 {
3537 #ifndef OPENSSL_NO_RSA
3538                 if (alg_k & SSL_kRSA)
3539                         {
3540                         if (rsa == NULL
3541                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3542                                 {
3543                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3544                                 goto f_err;
3545                                 }
3546                         }
3547                 else
3548 #endif
3549 #ifndef OPENSSL_NO_DH
3550                         if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
3551                             {
3552                             if (dh == NULL
3553                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3554                                 {
3555                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3556                                 goto f_err;
3557                                 }
3558                         }
3559                 else
3560 #endif
3561                         {
3562                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3563                         goto f_err;
3564                         }
3565                 }
3566         return(1);
3567 f_err:
3568         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3569 err:
3570         return(0);
3571         }
3572
3573 /* Check to see if handshake is full or resumed. Usually this is just a
3574  * case of checking to see if a cache hit has occurred. In the case of
3575  * session tickets we have to check the next message to be sure.
3576  */
3577
3578 #ifndef OPENSSL_NO_TLSEXT
3579 # ifndef OPENSSL_NO_NEXTPROTONEG
3580 int ssl3_send_next_proto(SSL *s)
3581         {
3582         unsigned int len, padding_len;
3583         unsigned char *d;
3584
3585         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3586                 {
3587                 len = s->next_proto_negotiated_len;
3588                 padding_len = 32 - ((len + 2) % 32);
3589                 d = (unsigned char *)s->init_buf->data;
3590                 d[4] = len;
3591                 memcpy(d + 5, s->next_proto_negotiated, len);
3592                 d[5 + len] = padding_len;
3593                 memset(d + 6 + len, 0, padding_len);
3594                 *(d++)=SSL3_MT_NEXT_PROTO;
3595                 l2n3(2 + len + padding_len, d);
3596                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3597                 s->init_num = 4 + 2 + len + padding_len;
3598                 s->init_off = 0;
3599                 }
3600
3601         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3602         }
3603 # endif
3604
3605 int ssl3_check_finished(SSL *s)
3606         {
3607         int ok;
3608         long n;
3609
3610         /* Read the message to see if it is supplemental data,
3611          * regardless if there is a session ticket this function is
3612          * called when we really expect a Certificate message, so
3613          * permit appropriate message length */
3614         n=s->method->ssl_get_message(s,
3615                 SSL3_ST_CR_CERT_A,
3616                 SSL3_ST_CR_CERT_B,
3617                 -1,
3618                 s->max_cert_list,
3619                 &ok);
3620         if (!ok) return((int)n);
3621         s->s3->tmp.reuse_message = 1;
3622
3623         if (s->s3->tmp.message_type == SSL3_MT_SUPPLEMENTAL_DATA)
3624                 return 3;
3625         /* If we have no ticket it cannot be a resumed session. */
3626         if (!s->session->tlsext_tick)
3627                 return 1;
3628         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3629                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3630                 return 2;
3631
3632         return 1;
3633         }
3634 #endif
3635
3636 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3637         {
3638         int i = 0;
3639 #ifndef OPENSSL_NO_ENGINE
3640         if (s->ctx->client_cert_engine)
3641                 {
3642                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3643                                                 SSL_get_client_CA_list(s),
3644                                                 px509, ppkey, NULL, NULL, NULL);
3645                 if (i != 0)
3646                         return i;
3647                 }
3648 #endif
3649         if (s->ctx->client_cert_cb)
3650                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3651         return i;
3652         }
3653
3654 #ifndef OPENSSL_NO_TLSEXT
3655 int tls1_send_client_supplemental_data(SSL *s, int *skip)
3656         {
3657         int al = 0;
3658         if (s->ctx->cli_supp_data_records_count)
3659                 {
3660                 unsigned char *p = NULL;
3661                 unsigned char *size_loc = NULL;
3662                 cli_supp_data_record *record = NULL;
3663                 size_t length = 0;
3664                 size_t i = 0;
3665
3666                 for (i = 0; i < s->ctx->cli_supp_data_records_count; i++)
3667                         {
3668                         const unsigned char *out = NULL;
3669                         unsigned short outlen = 0;
3670                         int cb_retval = 0;
3671                         record = &s->ctx->cli_supp_data_records[i];
3672
3673                         /* NULL callback or -1 omits supp data entry*/
3674                         if (!record->fn2)
3675                                 continue;
3676                         cb_retval = record->fn2(s, record->supp_data_type,
3677                                                 &out, &outlen, &al,
3678                                                 record->arg);
3679                         if (cb_retval == -1)
3680                                 continue; /* skip this supp data entry */
3681                         if (cb_retval == 0)
3682                                 {
3683                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3684                                 goto f_err;
3685                                 }
3686                         if (outlen == 0 || TLSEXT_MAXLEN_supplemental_data < outlen + 4 + length)
3687                                 {
3688                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3689                                 return 0;
3690                                 }
3691                         /* if first entry, write handshake message type */
3692                         if (length == 0)
3693                                 {
3694                                 if (!BUF_MEM_grow_clean(s->init_buf, 4))
3695                                         {
3696                                         SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3697                                         return 0;
3698                                         }
3699                                 p = (unsigned char *)s->init_buf->data;
3700                                 *(p++) = SSL3_MT_SUPPLEMENTAL_DATA;
3701                                 /* update message length when all
3702                                  * callbacks complete */
3703                                 size_loc = p;
3704                                 /* skip over handshake length field (3
3705                                  * bytes) and supp_data length field
3706                                  * (3 bytes) */
3707                                 p += 3 + 3;
3708                                 length += 1 +3 +3;
3709                                 }
3710                         if (!BUF_MEM_grow(s->init_buf, outlen + 4))
3711                                 {
3712                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3713                                 return 0;
3714                                 }
3715                         s2n(record->supp_data_type, p);
3716                         s2n(outlen, p);
3717                         memcpy(p, out, outlen);
3718                         length += (outlen + 4);
3719                         p += outlen;
3720                         }
3721                 if (length > 0)
3722                         {
3723                         /* write handshake length */
3724                         l2n3(length - 4, size_loc);
3725                         /* supp_data length */
3726                         l2n3(length - 7, size_loc);
3727                         s->state = SSL3_ST_CW_SUPPLEMENTAL_DATA_B;
3728                         s->init_num = length;
3729                         s->init_off = 0;
3730                         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3731                         }
3732                 }
3733
3734         /* no supp data message sent */
3735         *skip = 1;
3736         s->init_num = 0;
3737         s->init_off = 0;
3738         return 1;
3739
3740         f_err:
3741         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3742         return 0;
3743         }
3744
3745 int tls1_get_server_supplemental_data(SSL *s)
3746         {
3747         int al = 0;
3748         int ok;
3749         long n;
3750         const unsigned char *p, *d;
3751         unsigned short supp_data_entry_type = 0;
3752         unsigned short supp_data_entry_len = 0;
3753         unsigned long supp_data_len = 0;
3754         size_t i;
3755         int cb_retval = 0;
3756
3757         n=s->method->ssl_get_message(s,
3758                                      SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3759                                      SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3760                                      SSL3_MT_SUPPLEMENTAL_DATA,
3761                                      /* use default limit */
3762                                      TLSEXT_MAXLEN_supplemental_data,
3763                                      &ok);
3764
3765         if (!ok) return((int)n);
3766
3767         p = (unsigned char *)s->init_msg;
3768         d = p;
3769         /* The message cannot be empty */
3770         if (n < 3)
3771                 {
3772                 al = SSL_AD_DECODE_ERROR;
3773                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3774                 goto f_err;
3775                 }
3776         n2l3(p, supp_data_len);
3777         while (p < d+supp_data_len)
3778                 {
3779                 n2s(p, supp_data_entry_type);
3780                 n2s(p, supp_data_entry_len);
3781                 /* if there is a callback for this supp data type, send it */
3782                 for (i=0; i < s->ctx->cli_supp_data_records_count; i++)
3783                         {
3784                         if (s->ctx->cli_supp_data_records[i].supp_data_type == supp_data_entry_type &&
3785                             s->ctx->cli_supp_data_records[i].fn1)
3786                                 {
3787                                 cb_retval = s->ctx->cli_supp_data_records[i].fn1(s, supp_data_entry_type, p,
3788                                                                                  supp_data_entry_len, &al,
3789                                                                                  s->ctx->cli_supp_data_records[i].arg);
3790                                 if (cb_retval == 0)
3791                                         {
3792                                         SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA, ERR_R_SSL_LIB);
3793                                         goto f_err;
3794                                         }
3795                                 }
3796                         }
3797                 p += supp_data_entry_len;
3798                 }
3799         return 1;
3800 f_err:
3801         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3802         return -1;
3803         }
3804 #endif