ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 {
 310 #ifndef OPENSSL_NO_TLSEXT
 311                                 /* The server hello indicated that
 312                                  * an audit proof would follow. */
 313                                 if (s->s3->tlsext_authz_server_promised)
 314                                         s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 315                                 else
 316 #endif
 317                                         s->state=SSL3_ST_CR_CERT_A;
 318                                 }
 319                         s->init_num=0;
 320                         break;
 321 #ifndef OPENSSL_NO_TLSEXT
 322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
 323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
 324                         ret = tls1_get_server_supplemental_data(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_A;
 327                         s->init_num = 0;
 328                         break;
 329 #endif
 330                 case SSL3_ST_CR_CERT_A:
 331                 case SSL3_ST_CR_CERT_B:
 332 #ifndef OPENSSL_NO_TLSEXT
 333                         ret=ssl3_check_finished(s);
 334                         if (ret <= 0) goto end;
 335                         if (ret == 2)
 336                                 {
 337                                 s->hit = 1;
 338                                 if (s->tlsext_ticket_expected)
 339                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_FINISHED_A;
 342                                 s->init_num=0;
 343                                 break;
 344                                 }
 345 #endif
 346                         /* Check if it is anon DH/ECDH */
 347                         /* or PSK */
 348                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 349                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 350                                 {
 351                                 ret=ssl3_get_server_certificate(s);
 352                                 if (ret <= 0) goto end;
 353 #ifndef OPENSSL_NO_TLSEXT
 354                                 if (s->tlsext_status_expected)
 355                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 356                                 else
 357                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 358                                 }
 359                         else
 360                                 {
 361                                 skip = 1;
 362                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 363                                 }
 364 #else
 365                                 }
 366                         else
 367                                 skip=1;
 368
 369                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 370 #endif
 371                         s->init_num=0;
 372                         break;
 373
 374                 case SSL3_ST_CR_KEY_EXCH_A:
 375                 case SSL3_ST_CR_KEY_EXCH_B:
 376                         ret=ssl3_get_key_exchange(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_CERT_REQ_A;
 379                         s->init_num=0;
 380
 381                         /* at this point we check that we have the
 382                          * required stuff from the server */
 383                         if (!ssl3_check_cert_and_algorithm(s))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388                         break;
 389
 390                 case SSL3_ST_CR_CERT_REQ_A:
 391                 case SSL3_ST_CR_CERT_REQ_B:
 392                         ret=ssl3_get_certificate_request(s);
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CR_SRVR_DONE_A:
 399                 case SSL3_ST_CR_SRVR_DONE_B:
 400                         ret=ssl3_get_server_done(s);
 401                         if (ret <= 0) goto end;
 402 #ifndef OPENSSL_NO_SRP
 403                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 404                                 {
 405                                 if ((ret = SRP_Calc_A_param(s))<=0)
 406                                         {
 407                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 408                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 409                                         goto end;
 410                                         }
 411                                 }
 412 #endif
 413                         if (s->s3->tmp.cert_req)
 414                                 s->state=SSL3_ST_CW_CERT_A;
 415                         else
 416                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 417                         s->init_num=0;
 418
 419                         break;
 420
 421                 case SSL3_ST_CW_CERT_A:
 422                 case SSL3_ST_CW_CERT_B:
 423                 case SSL3_ST_CW_CERT_C:
 424                 case SSL3_ST_CW_CERT_D:
 425                         ret=ssl3_send_client_certificate(s);
 426                         if (ret <= 0) goto end;
 427                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 428                         s->init_num=0;
 429                         break;
 430
 431                 case SSL3_ST_CW_KEY_EXCH_A:
 432                 case SSL3_ST_CW_KEY_EXCH_B:
 433                         ret=ssl3_send_client_key_exchange(s);
 434                         if (ret <= 0) goto end;
 435                         /* EAY EAY EAY need to check for DH fix cert
 436                          * sent back */
 437                         /* For TLS, cert_req is set to 2, so a cert chain
 438                          * of nothing is sent, but no verify packet is sent */
 439                         /* XXX: For now, we do not support client
 440                          * authentication in ECDH cipher suites with
 441                          * ECDH (rather than ECDSA) certificates.
 442                          * We need to skip the certificate verify
 443                          * message when client's ECDH public key is sent
 444                          * inside the client certificate.
 445                          */
 446                         if (s->s3->tmp.cert_req == 1)
 447                                 {
 448                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 449                                 }
 450                         else
 451                                 {
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                                 s->s3->change_cipher_spec=0;
 454                                 }
 455                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 456                                 {
 457                                 s->state=SSL3_ST_CW_CHANGE_A;
 458                                 s->s3->change_cipher_spec=0;
 459                                 }
 460
 461                         s->init_num=0;
 462                         break;
 463
 464                 case SSL3_ST_CW_CERT_VRFY_A:
 465                 case SSL3_ST_CW_CERT_VRFY_B:
 466                         ret=ssl3_send_client_verify(s);
 467                         if (ret <= 0) goto end;
 468                         s->state=SSL3_ST_CW_CHANGE_A;
 469                         s->init_num=0;
 470                         s->s3->change_cipher_spec=0;
 471                         break;
 472
 473                 case SSL3_ST_CW_CHANGE_A:
 474                 case SSL3_ST_CW_CHANGE_B:
 475                         ret=ssl3_send_change_cipher_spec(s,
 476                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 477                         if (ret <= 0) goto end;
 478
 479 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 480                         s->state=SSL3_ST_CW_FINISHED_A;
 481 #else
 482                         if (s->s3->next_proto_neg_seen)
 483                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 484                         else
 485                                 s->state=SSL3_ST_CW_FINISHED_A;
 486 #endif
 487                         s->init_num=0;
 488
 489                         s->session->cipher=s->s3->tmp.new_cipher;
 490 #ifdef OPENSSL_NO_COMP
 491                         s->session->compress_meth=0;
 492 #else
 493                         if (s->s3->tmp.new_compression == NULL)
 494                                 s->session->compress_meth=0;
 495                         else
 496                                 s->session->compress_meth=
 497                                         s->s3->tmp.new_compression->id;
 498 #endif
 499                         if (!s->method->ssl3_enc->setup_key_block(s))
 500                                 {
 501                                 ret= -1;
 502                                 goto end;
 503                                 }
 504
 505                         if (!s->method->ssl3_enc->change_cipher_state(s,
 506                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 507                                 {
 508                                 ret= -1;
 509                                 goto end;
 510                                 }
 511
 512                         break;
 513
 514 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 515                 case SSL3_ST_CW_NEXT_PROTO_A:
 516                 case SSL3_ST_CW_NEXT_PROTO_B:
 517                         ret=ssl3_send_next_proto(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CW_FINISHED_A;
 520                         break;
 521 #endif
 522
 523                 case SSL3_ST_CW_FINISHED_A:
 524                 case SSL3_ST_CW_FINISHED_B:
 525                         ret=ssl3_send_finished(s,
 526                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 527                                 s->method->ssl3_enc->client_finished_label,
 528                                 s->method->ssl3_enc->client_finished_label_len);
 529                         if (ret <= 0) goto end;
 530                         s->state=SSL3_ST_CW_FLUSH;
 531
 532                         /* clear flags */
 533                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 534                         if (s->hit)
 535                                 {
 536                                 s->s3->tmp.next_state=SSL_ST_OK;
 537                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 538                                         {
 539                                         s->state=SSL_ST_OK;
 540                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 541                                         s->s3->delay_buf_pop_ret=0;
 542                                         }
 543                                 }
 544                         else
 545                                 {
 546 #ifndef OPENSSL_NO_TLSEXT
 547                                 /* Allow NewSessionTicket if ticket expected */
 548                                 if (s->tlsext_ticket_expected)
 549                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 550                                 else
 551 #endif
 552
 553                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 554                                 }
 555                         s->init_num=0;
 556                         break;
 557
 558 #ifndef OPENSSL_NO_TLSEXT
 559                 case SSL3_ST_CR_SESSION_TICKET_A:
 560                 case SSL3_ST_CR_SESSION_TICKET_B:
 561                         ret=ssl3_get_new_session_ticket(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_CR_FINISHED_A;
 564                         s->init_num=0;
 565                 break;
 566
 567                 case SSL3_ST_CR_CERT_STATUS_A:
 568                 case SSL3_ST_CR_CERT_STATUS_B:
 569                         ret=ssl3_get_cert_status(s);
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 572                         s->init_num=0;
 573                 break;
 574 #endif
 575
 576                 case SSL3_ST_CR_FINISHED_A:
 577                 case SSL3_ST_CR_FINISHED_B:
 578
 579                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 580                                 SSL3_ST_CR_FINISHED_B);
 581                         if (ret <= 0) goto end;
 582
 583                         if (s->hit)
 584                                 s->state=SSL3_ST_CW_CHANGE_A;
 585                         else
 586                                 s->state=SSL_ST_OK;
 587                         s->init_num=0;
 588                         break;
 589
 590                 case SSL3_ST_CW_FLUSH:
 591                         s->rwstate=SSL_WRITING;
 592                         if (BIO_flush(s->wbio) <= 0)
 593                                 {
 594                                 ret= -1;
 595                                 goto end;
 596                                 }
 597                         s->rwstate=SSL_NOTHING;
 598                         s->state=s->s3->tmp.next_state;
 599                         break;
 600
 601                 case SSL_ST_OK:
 602                         /* clean a few things up */
 603                         ssl3_cleanup_key_block(s);
 604
 605                         if (s->init_buf != NULL)
 606                                 {
 607                                 BUF_MEM_free(s->init_buf);
 608                                 s->init_buf=NULL;
 609                                 }
 610
 611                         /* If we are not 'joining' the last two packets,
 612                          * remove the buffering now */
 613                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 614                                 ssl_free_wbio_buffer(s);
 615                         /* else do it later in ssl3_write */
 616
 617                         s->init_num=0;
 618                         s->renegotiate=0;
 619                         s->new_session=0;
 620
 621                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 622                         if (s->hit) s->ctx->stats.sess_hit++;
 623
 624                         ret=1;
 625                         /* s->server=0; */
 626                         s->handshake_func=ssl3_connect;
 627                         s->ctx->stats.sess_connect_good++;
 628
 629                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 630
 631                         goto end;
 632                         /* break; */
 633
 634                 default:
 635                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 636                         ret= -1;
 637                         goto end;
 638                         /* break; */
 639                         }
 640
 641                 /* did we do anything */
 642                 if (!s->s3->tmp.reuse_message && !skip)
 643                         {
 644                         if (s->debug)
 645                                 {
 646                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 647                                         goto end;
 648                                 }
 649
 650                         if ((cb != NULL) && (s->state != state))
 651                                 {
 652                                 new_state=s->state;
 653                                 s->state=state;
 654                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 655                                 s->state=new_state;
 656                                 }
 657                         }
 658                 skip=0;
 659                 }
 660 end:
 661         s->in_handshake--;
 662         if (buf != NULL)
 663                 BUF_MEM_free(buf);
 664         if (cb != NULL)
 665                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 666         return(ret);
 667         }
 668
 669
 670 int ssl3_client_hello(SSL *s)
 671         {
 672         unsigned char *buf;
 673         unsigned char *p,*d;
 674         int i;
 675         unsigned long Time,l;
 676 #ifndef OPENSSL_NO_COMP
 677         int j;
 678         SSL_COMP *comp;
 679 #endif
 680
 681         buf=(unsigned char *)s->init_buf->data;
 682         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 683                 {
 684                 SSL_SESSION *sess = s->session;
 685                 if ((sess == NULL) ||
 686                         (sess->ssl_version != s->version) ||
 687 #ifdef OPENSSL_NO_TLSEXT
 688                         !sess->session_id_length ||
 689 #else
 690                         (!sess->session_id_length && !sess->tlsext_tick) ||
 691 #endif
 692                         (sess->not_resumable))
 693                         {
 694                         if (!ssl_get_new_session(s,0))
 695                                 goto err;
 696                         }
 697                 if (s->method->version == DTLS_ANY_VERSION)
 698                         {
 699                         /* Determine which DTLS version to use */
 700                         int options = s->options;
 701                         /* If DTLS 1.2 disabled correct the version number */
 702                         if (options & SSL_OP_NO_DTLSv1_2)
 703                                 {
 704                                 if (tls1_suiteb(s))
 705                                         {
 706                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 707                                         goto err;
 708                                         }
 709                                 /* Disabling all versions is silly: return an
 710                                  * error.
 711                                  */
 712                                 if (options & SSL_OP_NO_DTLSv1)
 713                                         {
 714                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 715                                         goto err;
 716                                         }
 717                                 /* Update method so we don't use any DTLS 1.2
 718                                  * features.
 719                                  */
 720                                 s->method = DTLSv1_client_method();
 721                                 s->version = DTLS1_VERSION;
 722                                 }
 723                         else
 724                                 {
 725                                 /* We only support one version: update method */
 726                                 if (options & SSL_OP_NO_DTLSv1)
 727                                         s->method = DTLSv1_2_client_method();
 728                                 s->version = DTLS1_2_VERSION;
 729                                 }
 730                         s->client_version = s->version;
 731                         }
 732                 /* else use the pre-loaded session */
 733
 734                 p=s->s3->client_random;
 735
 736                 /* for DTLS if client_random is initialized, reuse it, we are
 737                  * required to use same upon reply to HelloVerify */
 738                 if (SSL_IS_DTLS(s))
 739                         {
 740                         size_t idx;
 741                         i = 1;
 742                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 743                                 {
 744                                 if (p[idx])
 745                                         {
 746                                         i = 0;
 747                                         break;
 748                                         }
 749                                 }
 750                         }
 751                 else
 752                         i = 1;
 753
 754                 if (i)
 755                         {
 756                         Time=(unsigned long)time(NULL); /* Time */
 757                         l2n(Time,p);
 758                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
 759
 760                         }
 761
 762                 /* Do the message type and length last */
 763                 d=p= ssl_handshake_start(s);
 764
 765                 /* version indicates the negotiated version: for example from
 766                  * an SSLv2/v3 compatible client hello). The client_version
 767                  * field is the maximum version we permit and it is also
 768                  * used in RSA encrypted premaster secrets. Some servers can
 769                  * choke if we initially report a higher version then
 770                  * renegotiate to a lower one in the premaster secret. This
 771                  * didn't happen with TLS 1.0 as most servers supported it
 772                  * but it can with TLS 1.1 or later if the server only supports
 773                  * 1.0.
 774                  *
 775                  * Possible scenario with previous logic:
 776                  *      1. Client hello indicates TLS 1.2
 777                  *      2. Server hello says TLS 1.0
 778                  *      3. RSA encrypted premaster secret uses 1.2.
 779                  *      4. Handhaked proceeds using TLS 1.0.
 780                  *      5. Server sends hello request to renegotiate.
 781                  *      6. Client hello indicates TLS v1.0 as we now
 782                  *         know that is maximum server supports.
 783                  *      7. Server chokes on RSA encrypted premaster secret
 784                  *         containing version 1.0.
 785                  *
 786                  * For interoperability it should be OK to always use the
 787                  * maximum version we support in client hello and then rely
 788                  * on the checking of version to ensure the servers isn't
 789                  * being inconsistent: for example initially negotiating with
 790                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 791                  * client_version in client hello and not resetting it to
 792                  * the negotiated version.
 793                  */
 794 #if 0
 795                 *(p++)=s->version>>8;
 796                 *(p++)=s->version&0xff;
 797                 s->client_version=s->version;
 798 #else
 799                 *(p++)=s->client_version>>8;
 800                 *(p++)=s->client_version&0xff;
 801 #endif
 802
 803                 /* Random stuff */
 804                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 805                 p+=SSL3_RANDOM_SIZE;
 806
 807                 /* Session ID */
 808                 if (s->new_session)
 809                         i=0;
 810                 else
 811                         i=s->session->session_id_length;
 812                 *(p++)=i;
 813                 if (i != 0)
 814                         {
 815                         if (i > (int)sizeof(s->session->session_id))
 816                                 {
 817                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 818                                 goto err;
 819                                 }
 820                         memcpy(p,s->session->session_id,i);
 821                         p+=i;
 822                         }
 823
 824                 /* cookie stuff for DTLS */
 825                 if (SSL_IS_DTLS(s))
 826                         {
 827                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 828                                 {
 829                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 830                                 goto err;
 831                                 }
 832                         *(p++) = s->d1->cookie_len;
 833                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 834                         p += s->d1->cookie_len;
 835                         }
 836
 837                 /* Ciphers supported */
 838                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 839                 if (i == 0)
 840                         {
 841                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 842                         goto err;
 843                         }
 844 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 845                         /* Some servers hang if client hello > 256 bytes
 846                          * as hack workaround chop number of supported ciphers
 847                          * to keep it well below this if we use TLS v1.2
 848                          */
 849                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 850                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 851                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 852 #endif
 853                 s2n(i,p);
 854                 p+=i;
 855
 856                 /* COMPRESSION */
 857 #ifdef OPENSSL_NO_COMP
 858                 *(p++)=1;
 859 #else
 860
 861                 if ((s->options & SSL_OP_NO_COMPRESSION)
 862                                         || !s->ctx->comp_methods)
 863                         j=0;
 864                 else
 865                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 866                 *(p++)=1+j;
 867                 for (i=0; i<j; i++)
 868                         {
 869                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 870                         *(p++)=comp->id;
 871                         }
 872 #endif
 873                 *(p++)=0; /* Add the NULL method */
 874
 875 #ifndef OPENSSL_NO_TLSEXT
 876                 /* TLS extensions*/
 877                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 878                         {
 879                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 880                         goto err;
 881                         }
 882                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 883                         {
 884                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 885                         goto err;
 886                         }
 887 #endif
 888
 889                 l= p-d;
 890                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 891                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 892                 }
 893
 894         /* SSL3_ST_CW_CLNT_HELLO_B */
 895         return ssl_do_write(s);
 896 err:
 897         return(-1);
 898         }
 899
 900 int ssl3_get_server_hello(SSL *s)
 901         {
 902         STACK_OF(SSL_CIPHER) *sk;
 903         const SSL_CIPHER *c;
 904         CERT *ct = s->cert;
 905         unsigned char *p,*d;
 906         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 907         unsigned int j;
 908         long n;
 909 #ifndef OPENSSL_NO_COMP
 910         SSL_COMP *comp;
 911 #endif
 912         /* Hello verify request and/or server hello version may not
 913          * match so set first packet if we're negotiating version.
 914          */
 915         if (s->method->version == DTLS_ANY_VERSION)
 916                 s->first_packet = 1;
 917
 918         n=s->method->ssl_get_message(s,
 919                 SSL3_ST_CR_SRVR_HELLO_A,
 920                 SSL3_ST_CR_SRVR_HELLO_B,
 921                 -1,
 922                 20000, /* ?? */
 923                 &ok);
 924
 925         if (!ok) return((int)n);
 926
 927         if (SSL_IS_DTLS(s))
 928                 {
 929                 s->first_packet = 0;
 930                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 931                         {
 932                         if ( s->d1->send_cookie == 0)
 933                                 {
 934                                 s->s3->tmp.reuse_message = 1;
 935                                 return 1;
 936                                 }
 937                         else /* already sent a cookie */
 938                                 {
 939                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 940                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 941                                 goto f_err;
 942                                 }
 943                         }
 944                 }
 945
 946         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 947                 {
 948                 al=SSL_AD_UNEXPECTED_MESSAGE;
 949                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 950                 goto f_err;
 951                 }
 952
 953         d=p=(unsigned char *)s->init_msg;
 954         if (s->method->version == DTLS_ANY_VERSION)
 955                 {
 956                 /* Work out correct protocol version to use */
 957                 int hversion = (p[0] << 8)|p[1];
 958                 int options = s->options;
 959                 if (hversion == DTLS1_2_VERSION
 960                         && !(options & SSL_OP_NO_DTLSv1_2))
 961                         s->method = DTLSv1_2_client_method();
 962                 else if (tls1_suiteb(s))
 963                         {
 964                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 965                         s->version = hversion;
 966                         al = SSL_AD_PROTOCOL_VERSION;
 967                         goto f_err;
 968                         }
 969                 else if (hversion == DTLS1_VERSION
 970                         && !(options & SSL_OP_NO_DTLSv1))
 971                         s->method = DTLSv1_client_method();
 972                 else
 973                         {
 974                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 975                         s->version = hversion;
 976                         al = SSL_AD_PROTOCOL_VERSION;
 977                         goto f_err;
 978                         }
 979                 s->version = s->client_version = s->method->version;
 980                 }
 981
 982         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 983                 {
 984                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 985                 s->version=(s->version&0xff00)|p[1];
 986                 al=SSL_AD_PROTOCOL_VERSION;
 987                 goto f_err;
 988                 }
 989         p+=2;
 990
 991         /* load the server hello data */
 992         /* load the server random */
 993         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 994         p+=SSL3_RANDOM_SIZE;
 995
 996         /* get the session-id */
 997         j= *(p++);
 998
 999         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1000                 {
1001                 al=SSL_AD_ILLEGAL_PARAMETER;
1002                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1003                 goto f_err;
1004                 }
1005
1006 #ifndef OPENSSL_NO_TLSEXT
1007         /* check if we want to resume the session based on external pre-shared secret */
1008         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1009                 {
1010                 SSL_CIPHER *pref_cipher=NULL;
1011                 s->session->master_key_length=sizeof(s->session->master_key);
1012                 if (s->tls_session_secret_cb(s, s->session->master_key,
1013                                              &s->session->master_key_length,
1014                                              NULL, &pref_cipher,
1015                                              s->tls_session_secret_cb_arg))
1016                         {
1017                         s->session->cipher = pref_cipher ?
1018                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1019                         }
1020                 }
1021 #endif /* OPENSSL_NO_TLSEXT */
1022
1023         if (j != 0 && j == s->session->session_id_length
1024             && memcmp(p,s->session->session_id,j) == 0)
1025             {
1026             if(s->sid_ctx_length != s->session->sid_ctx_length
1027                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1028                 {
1029                 /* actually a client application bug */
1030                 al=SSL_AD_ILLEGAL_PARAMETER;
1031                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1032                 goto f_err;
1033                 }
1034             s->hit=1;
1035             }
1036         else    /* a miss or crap from the other end */
1037                 {
1038                 /* If we were trying for session-id reuse, make a new
1039                  * SSL_SESSION so we don't stuff up other people */
1040                 s->hit=0;
1041                 if (s->session->session_id_length > 0)
1042                         {
1043                         if (!ssl_get_new_session(s,0))
1044                                 {
1045                                 goto f_err;
1046                                 }
1047                         }
1048                 s->session->session_id_length=j;
1049                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1050                 }
1051         p+=j;
1052         c=ssl_get_cipher_by_char(s,p);
1053         if (c == NULL)
1054                 {
1055                 /* unknown cipher */
1056                 al=SSL_AD_ILLEGAL_PARAMETER;
1057                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1058                 goto f_err;
1059                 }
1060         /* If it is a disabled cipher we didn't send it in client hello,
1061          * so return an error.
1062          */
1063         if (c->algorithm_ssl & ct->mask_ssl ||
1064                 c->algorithm_mkey & ct->mask_k ||
1065                 c->algorithm_auth & ct->mask_a)
1066                 {
1067                 al=SSL_AD_ILLEGAL_PARAMETER;
1068                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1069                 goto f_err;
1070                 }
1071         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1072
1073         sk=ssl_get_ciphers_by_id(s);
1074         i=sk_SSL_CIPHER_find(sk,c);
1075         if (i < 0)
1076                 {
1077                 /* we did not say we would use this cipher */
1078                 al=SSL_AD_ILLEGAL_PARAMETER;
1079                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1080                 goto f_err;
1081                 }
1082
1083         /* Depending on the session caching (internal/external), the cipher
1084            and/or cipher_id values may not be set. Make sure that
1085            cipher_id is set and use it for comparison. */
1086         if (s->session->cipher)
1087                 s->session->cipher_id = s->session->cipher->id;
1088         if (s->hit && (s->session->cipher_id != c->id))
1089                 {
1090 /* Workaround is now obsolete */
1091 #if 0
1092                 if (!(s->options &
1093                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1094 #endif
1095                         {
1096                         al=SSL_AD_ILLEGAL_PARAMETER;
1097                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1098                         goto f_err;
1099                         }
1100                 }
1101         s->s3->tmp.new_cipher=c;
1102         /* Don't digest cached records if no sigalgs: we may need them for
1103          * client authentication.
1104          */
1105         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1106                 goto f_err;
1107         /* lets get the compression algorithm */
1108         /* COMPRESSION */
1109 #ifdef OPENSSL_NO_COMP
1110         if (*(p++) != 0)
1111                 {
1112                 al=SSL_AD_ILLEGAL_PARAMETER;
1113                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1114                 goto f_err;
1115                 }
1116         /* If compression is disabled we'd better not try to resume a session
1117          * using compression.
1118          */
1119         if (s->session->compress_meth != 0)
1120                 {
1121                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1122                 goto f_err;
1123                 }
1124 #else
1125         j= *(p++);
1126         if (s->hit && j != s->session->compress_meth)
1127                 {
1128                 al=SSL_AD_ILLEGAL_PARAMETER;
1129                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1130                 goto f_err;
1131                 }
1132         if (j == 0)
1133                 comp=NULL;
1134         else if (s->options & SSL_OP_NO_COMPRESSION)
1135                 {
1136                 al=SSL_AD_ILLEGAL_PARAMETER;
1137                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1138                 goto f_err;
1139                 }
1140         else
1141                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1142
1143         if ((j != 0) && (comp == NULL))
1144                 {
1145                 al=SSL_AD_ILLEGAL_PARAMETER;
1146                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1147                 goto f_err;
1148                 }
1149         else
1150                 {
1151                 s->s3->tmp.new_compression=comp;
1152                 }
1153 #endif
1154
1155 #ifndef OPENSSL_NO_TLSEXT
1156         /* TLS extensions*/
1157         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1158                 {
1159                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1160                 goto err;
1161                 }
1162 #endif
1163
1164         if (p != (d+n))
1165                 {
1166                 /* wrong packet length */
1167                 al=SSL_AD_DECODE_ERROR;
1168                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1169                 goto f_err;
1170                 }
1171
1172         return(1);
1173 f_err:
1174         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1175 err:
1176         return(-1);
1177         }
1178
1179 int ssl3_get_server_certificate(SSL *s)
1180         {
1181         int al,i,ok,ret= -1;
1182         unsigned long n,nc,llen,l;
1183         X509 *x=NULL;
1184         const unsigned char *q,*p;
1185         unsigned char *d;
1186         STACK_OF(X509) *sk=NULL;
1187         SESS_CERT *sc;
1188         EVP_PKEY *pkey=NULL;
1189         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1190
1191         n=s->method->ssl_get_message(s,
1192                 SSL3_ST_CR_CERT_A,
1193                 SSL3_ST_CR_CERT_B,
1194                 -1,
1195                 s->max_cert_list,
1196                 &ok);
1197
1198         if (!ok) return((int)n);
1199
1200         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1201                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1202                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1203                 {
1204                 s->s3->tmp.reuse_message=1;
1205                 return(1);
1206                 }
1207
1208         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1209                 {
1210                 al=SSL_AD_UNEXPECTED_MESSAGE;
1211                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1212                 goto f_err;
1213                 }
1214         p=d=(unsigned char *)s->init_msg;
1215
1216         if ((sk=sk_X509_new_null()) == NULL)
1217                 {
1218                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1219                 goto err;
1220                 }
1221
1222         n2l3(p,llen);
1223         if (llen+3 != n)
1224                 {
1225                 al=SSL_AD_DECODE_ERROR;
1226                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1227                 goto f_err;
1228                 }
1229         for (nc=0; nc<llen; )
1230                 {
1231                 n2l3(p,l);
1232                 if ((l+nc+3) > llen)
1233                         {
1234                         al=SSL_AD_DECODE_ERROR;
1235                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1236                         goto f_err;
1237                         }
1238
1239                 q=p;
1240                 x=d2i_X509(NULL,&q,l);
1241                 if (x == NULL)
1242                         {
1243                         al=SSL_AD_BAD_CERTIFICATE;
1244                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1245                         goto f_err;
1246                         }
1247                 if (q != (p+l))
1248                         {
1249                         al=SSL_AD_DECODE_ERROR;
1250                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1251                         goto f_err;
1252                         }
1253                 if (!sk_X509_push(sk,x))
1254                         {
1255                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1256                         goto err;
1257                         }
1258                 x=NULL;
1259                 nc+=l+3;
1260                 p=q;
1261                 }
1262
1263         i=ssl_verify_cert_chain(s,sk);
1264         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1265 #ifndef OPENSSL_NO_KRB5
1266             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1267                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1268 #endif /* OPENSSL_NO_KRB5 */
1269                 )
1270                 {
1271                 al=ssl_verify_alarm_type(s->verify_result);
1272                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1273                 goto f_err;
1274                 }
1275         ERR_clear_error(); /* but we keep s->verify_result */
1276
1277         sc=ssl_sess_cert_new();
1278         if (sc == NULL) goto err;
1279
1280         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1281         s->session->sess_cert=sc;
1282
1283         sc->cert_chain=sk;
1284         /* Inconsistency alert: cert_chain does include the peer's
1285          * certificate, which we don't include in s3_srvr.c */
1286         x=sk_X509_value(sk,0);
1287         sk=NULL;
1288         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1289
1290         pkey=X509_get_pubkey(x);
1291
1292         /* VRS: allow null cert if auth == KRB5 */
1293         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1294                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1295                     ? 0 : 1;
1296
1297 #ifdef KSSL_DEBUG
1298         printf("pkey,x = %p, %p\n", pkey,x);
1299         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1300         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1301                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1302 #endif    /* KSSL_DEBUG */
1303
1304         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1305                 {
1306                 x=NULL;
1307                 al=SSL3_AL_FATAL;
1308                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1309                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1310                 goto f_err;
1311                 }
1312
1313         i=ssl_cert_type(x,pkey);
1314         if (need_cert && i < 0)
1315                 {
1316                 x=NULL;
1317                 al=SSL3_AL_FATAL;
1318                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1319                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1320                 goto f_err;
1321                 }
1322
1323         if (need_cert)
1324                 {
1325                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1326                 if (exp_idx >= 0 && i != exp_idx)
1327                         {
1328                         x=NULL;
1329                         al=SSL_AD_ILLEGAL_PARAMETER;
1330                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1331                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1332                         goto f_err;
1333                         }
1334                 sc->peer_cert_type=i;
1335                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1336                 /* Why would the following ever happen?
1337                  * We just created sc a couple of lines ago. */
1338                 if (sc->peer_pkeys[i].x509 != NULL)
1339                         X509_free(sc->peer_pkeys[i].x509);
1340                 sc->peer_pkeys[i].x509=x;
1341                 sc->peer_key= &(sc->peer_pkeys[i]);
1342
1343                 if (s->session->peer != NULL)
1344                         X509_free(s->session->peer);
1345                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1346                 s->session->peer=x;
1347                 }
1348         else
1349                 {
1350                 sc->peer_cert_type=i;
1351                 sc->peer_key= NULL;
1352
1353                 if (s->session->peer != NULL)
1354                         X509_free(s->session->peer);
1355                 s->session->peer=NULL;
1356                 }
1357         s->session->verify_result = s->verify_result;
1358
1359         x=NULL;
1360 #ifndef OPENSSL_NO_TLSEXT
1361         /* Check the audit proof. */
1362         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1363                 {
1364                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1365                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1366                 if (ret <= 0)
1367                         {
1368                         al = SSL_AD_BAD_CERTIFICATE;
1369                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1370                         goto f_err;
1371                         }
1372                 }
1373
1374 #endif
1375         ret=1;
1376         if (0)
1377                 {
1378 f_err:
1379                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1380                 }
1381 err:
1382         EVP_PKEY_free(pkey);
1383         X509_free(x);
1384         sk_X509_pop_free(sk,X509_free);
1385         return(ret);
1386         }
1387
1388 int ssl3_get_key_exchange(SSL *s)
1389         {
1390 #ifndef OPENSSL_NO_RSA
1391         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1392 #endif
1393         EVP_MD_CTX md_ctx;
1394         unsigned char *param,*p;
1395         int al,i,j,param_len,ok;
1396         long n,alg_k,alg_a;
1397         EVP_PKEY *pkey=NULL;
1398         const EVP_MD *md = NULL;
1399 #ifndef OPENSSL_NO_RSA
1400         RSA *rsa=NULL;
1401 #endif
1402 #ifndef OPENSSL_NO_DH
1403         DH *dh=NULL;
1404 #endif
1405 #ifndef OPENSSL_NO_ECDH
1406         EC_KEY *ecdh = NULL;
1407         BN_CTX *bn_ctx = NULL;
1408         EC_POINT *srvr_ecpoint = NULL;
1409         int curve_nid = 0;
1410         int encoded_pt_len = 0;
1411 #endif
1412
1413         /* use same message size as in ssl3_get_certificate_request()
1414          * as ServerKeyExchange message may be skipped */
1415         n=s->method->ssl_get_message(s,
1416                 SSL3_ST_CR_KEY_EXCH_A,
1417                 SSL3_ST_CR_KEY_EXCH_B,
1418                 -1,
1419                 s->max_cert_list,
1420                 &ok);
1421         if (!ok) return((int)n);
1422
1423         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1424                 {
1425 #ifndef OPENSSL_NO_PSK
1426                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1427                    omitted if no identity hint is sent. Set
1428                    session->sess_cert anyway to avoid problems
1429                    later.*/
1430                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1431                         {
1432                         s->session->sess_cert=ssl_sess_cert_new();
1433                         if (s->ctx->psk_identity_hint)
1434                                 OPENSSL_free(s->ctx->psk_identity_hint);
1435                         s->ctx->psk_identity_hint = NULL;
1436                         }
1437 #endif
1438                 s->s3->tmp.reuse_message=1;
1439                 return(1);
1440                 }
1441
1442         param=p=(unsigned char *)s->init_msg;
1443         if (s->session->sess_cert != NULL)
1444                 {
1445 #ifndef OPENSSL_NO_RSA
1446                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1447                         {
1448                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1449                         s->session->sess_cert->peer_rsa_tmp=NULL;
1450                         }
1451 #endif
1452 #ifndef OPENSSL_NO_DH
1453                 if (s->session->sess_cert->peer_dh_tmp)
1454                         {
1455                         DH_free(s->session->sess_cert->peer_dh_tmp);
1456                         s->session->sess_cert->peer_dh_tmp=NULL;
1457                         }
1458 #endif
1459 #ifndef OPENSSL_NO_ECDH
1460                 if (s->session->sess_cert->peer_ecdh_tmp)
1461                         {
1462                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1463                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1464                         }
1465 #endif
1466                 }
1467         else
1468                 {
1469                 s->session->sess_cert=ssl_sess_cert_new();
1470                 }
1471
1472         param_len=0;
1473         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1474         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1475         EVP_MD_CTX_init(&md_ctx);
1476
1477 #ifndef OPENSSL_NO_PSK
1478         if (alg_k & SSL_kPSK)
1479                 {
1480                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1481
1482                 al=SSL_AD_HANDSHAKE_FAILURE;
1483                 n2s(p,i);
1484                 param_len=i+2;
1485                 /* Store PSK identity hint for later use, hint is used
1486                  * in ssl3_send_client_key_exchange.  Assume that the
1487                  * maximum length of a PSK identity hint can be as
1488                  * long as the maximum length of a PSK identity. */
1489                 if (i > PSK_MAX_IDENTITY_LEN)
1490                         {
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1492                                 SSL_R_DATA_LENGTH_TOO_LONG);
1493                         goto f_err;
1494                         }
1495                 if (param_len > n)
1496                         {
1497                         al=SSL_AD_DECODE_ERROR;
1498                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1499                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1500                         goto f_err;
1501                         }
1502                 /* If received PSK identity hint contains NULL
1503                  * characters, the hint is truncated from the first
1504                  * NULL. p may not be ending with NULL, so create a
1505                  * NULL-terminated string. */
1506                 memcpy(tmp_id_hint, p, i);
1507                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1508                 if (s->ctx->psk_identity_hint != NULL)
1509                         OPENSSL_free(s->ctx->psk_identity_hint);
1510                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1511                 if (s->ctx->psk_identity_hint == NULL)
1512                         {
1513                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1514                         goto f_err;
1515                         }
1516
1517                 p+=i;
1518                 n-=param_len;
1519                 }
1520         else
1521 #endif /* !OPENSSL_NO_PSK */
1522 #ifndef OPENSSL_NO_SRP
1523         if (alg_k & SSL_kSRP)
1524                 {
1525                 n2s(p,i);
1526                 param_len=i+2;
1527                 if (param_len > n)
1528                         {
1529                         al=SSL_AD_DECODE_ERROR;
1530                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1531                         goto f_err;
1532                         }
1533                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1534                         {
1535                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1536                         goto err;
1537                         }
1538                 p+=i;
1539
1540                 n2s(p,i);
1541                 param_len+=i+2;
1542                 if (param_len > n)
1543                         {
1544                         al=SSL_AD_DECODE_ERROR;
1545                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1546                         goto f_err;
1547                         }
1548                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1549                         {
1550                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1551                         goto err;
1552                         }
1553                 p+=i;
1554
1555                 i = (unsigned int)(p[0]);
1556                 p++;
1557                 param_len+=i+1;
1558                 if (param_len > n)
1559                         {
1560                         al=SSL_AD_DECODE_ERROR;
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1562                         goto f_err;
1563                         }
1564                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1565                         {
1566                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1567                         goto err;
1568                         }
1569                 p+=i;
1570
1571                 n2s(p,i);
1572                 param_len+=i+2;
1573                 if (param_len > n)
1574                         {
1575                         al=SSL_AD_DECODE_ERROR;
1576                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1577                         goto f_err;
1578                         }
1579                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1580                         {
1581                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1582                         goto err;
1583                         }
1584                 p+=i;
1585                 n-=param_len;
1586
1587 /* We must check if there is a certificate */
1588 #ifndef OPENSSL_NO_RSA
1589                 if (alg_a & SSL_aRSA)
1590                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1591 #else
1592                 if (0)
1593                         ;
1594 #endif
1595 #ifndef OPENSSL_NO_DSA
1596                 else if (alg_a & SSL_aDSS)
1597                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1598 #endif
1599                 }
1600         else
1601 #endif /* !OPENSSL_NO_SRP */
1602 #ifndef OPENSSL_NO_RSA
1603         if (alg_k & SSL_kRSA)
1604                 {
1605                 if ((rsa=RSA_new()) == NULL)
1606                         {
1607                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1608                         goto err;
1609                         }
1610                 n2s(p,i);
1611                 param_len=i+2;
1612                 if (param_len > n)
1613                         {
1614                         al=SSL_AD_DECODE_ERROR;
1615                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1616                         goto f_err;
1617                         }
1618                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1619                         {
1620                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1621                         goto err;
1622                         }
1623                 p+=i;
1624
1625                 n2s(p,i);
1626                 param_len+=i+2;
1627                 if (param_len > n)
1628                         {
1629                         al=SSL_AD_DECODE_ERROR;
1630                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1631                         goto f_err;
1632                         }
1633                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1636                         goto err;
1637                         }
1638                 p+=i;
1639                 n-=param_len;
1640
1641                 /* this should be because we are using an export cipher */
1642                 if (alg_a & SSL_aRSA)
1643                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1644                 else
1645                         {
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1647                         goto err;
1648                         }
1649                 s->session->sess_cert->peer_rsa_tmp=rsa;
1650                 rsa=NULL;
1651                 }
1652 #else /* OPENSSL_NO_RSA */
1653         if (0)
1654                 ;
1655 #endif
1656 #ifndef OPENSSL_NO_DH
1657         else if (alg_k & SSL_kEDH)
1658                 {
1659                 if ((dh=DH_new()) == NULL)
1660                         {
1661                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1662                         goto err;
1663                         }
1664                 n2s(p,i);
1665                 param_len=i+2;
1666                 if (param_len > n)
1667                         {
1668                         al=SSL_AD_DECODE_ERROR;
1669                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1670                         goto f_err;
1671                         }
1672                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1675                         goto err;
1676                         }
1677                 p+=i;
1678
1679                 n2s(p,i);
1680                 param_len+=i+2;
1681                 if (param_len > n)
1682                         {
1683                         al=SSL_AD_DECODE_ERROR;
1684                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1685                         goto f_err;
1686                         }
1687                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1688                         {
1689                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1690                         goto err;
1691                         }
1692                 p+=i;
1693
1694                 n2s(p,i);
1695                 param_len+=i+2;
1696                 if (param_len > n)
1697                         {
1698                         al=SSL_AD_DECODE_ERROR;
1699                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1700                         goto f_err;
1701                         }
1702                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1703                         {
1704                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1705                         goto err;
1706                         }
1707                 p+=i;
1708                 n-=param_len;
1709
1710 #ifndef OPENSSL_NO_RSA
1711                 if (alg_a & SSL_aRSA)
1712                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1713 #else
1714                 if (0)
1715                         ;
1716 #endif
1717 #ifndef OPENSSL_NO_DSA
1718                 else if (alg_a & SSL_aDSS)
1719                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1720 #endif
1721                 /* else anonymous DH, so no certificate or pkey. */
1722
1723                 s->session->sess_cert->peer_dh_tmp=dh;
1724                 dh=NULL;
1725                 }
1726         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1727                 {
1728                 al=SSL_AD_ILLEGAL_PARAMETER;
1729                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1730                 goto f_err;
1731                 }
1732 #endif /* !OPENSSL_NO_DH */
1733
1734 #ifndef OPENSSL_NO_ECDH
1735         else if (alg_k & SSL_kEECDH)
1736                 {
1737                 EC_GROUP *ngroup;
1738                 const EC_GROUP *group;
1739
1740                 if ((ecdh=EC_KEY_new()) == NULL)
1741                         {
1742                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1743                         goto err;
1744                         }
1745
1746                 /* Extract elliptic curve parameters and the
1747                  * server's ephemeral ECDH public key.
1748                  * Keep accumulating lengths of various components in
1749                  * param_len and make sure it never exceeds n.
1750                  */
1751
1752                 /* XXX: For now we only support named (not generic) curves
1753                  * and the ECParameters in this case is just three bytes.
1754                  */
1755                 param_len=3;
1756                 /* Check curve is one of our prefrences, if not server has
1757                  * sent an invalid curve.
1758                  */
1759                 if (!tls1_check_curve(s, p, param_len))
1760                         {
1761                         al=SSL_AD_DECODE_ERROR;
1762                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1763                         goto f_err;
1764                         }
1765
1766                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1767                         {
1768                         al=SSL_AD_INTERNAL_ERROR;
1769                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1770                         goto f_err;
1771                         }
1772
1773                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1774                 if (ngroup == NULL)
1775                         {
1776                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1777                         goto err;
1778                         }
1779                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1780                         {
1781                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1782                         goto err;
1783                         }
1784                 EC_GROUP_free(ngroup);
1785
1786                 group = EC_KEY_get0_group(ecdh);
1787
1788                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1789                     (EC_GROUP_get_degree(group) > 163))
1790                         {
1791                         al=SSL_AD_EXPORT_RESTRICTION;
1792                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1793                         goto f_err;
1794                         }
1795
1796                 p+=3;
1797
1798                 /* Next, get the encoded ECPoint */
1799                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1800                     ((bn_ctx = BN_CTX_new()) == NULL))
1801                         {
1802                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1803                         goto err;
1804                         }
1805
1806                 encoded_pt_len = *p;  /* length of encoded point */
1807                 p+=1;
1808                 param_len += (1 + encoded_pt_len);
1809                 if ((param_len > n) ||
1810                     (EC_POINT_oct2point(group, srvr_ecpoint,
1811                         p, encoded_pt_len, bn_ctx) == 0))
1812                         {
1813                         al=SSL_AD_DECODE_ERROR;
1814                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1815                         goto f_err;
1816                         }
1817
1818                 n-=param_len;
1819                 p+=encoded_pt_len;
1820
1821                 /* The ECC/TLS specification does not mention
1822                  * the use of DSA to sign ECParameters in the server
1823                  * key exchange message. We do support RSA and ECDSA.
1824                  */
1825                 if (0) ;
1826 #ifndef OPENSSL_NO_RSA
1827                 else if (alg_a & SSL_aRSA)
1828                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1829 #endif
1830 #ifndef OPENSSL_NO_ECDSA
1831                 else if (alg_a & SSL_aECDSA)
1832                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1833 #endif
1834                 /* else anonymous ECDH, so no certificate or pkey. */
1835                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1836                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1837                 ecdh=NULL;
1838                 BN_CTX_free(bn_ctx);
1839                 bn_ctx = NULL;
1840                 EC_POINT_free(srvr_ecpoint);
1841                 srvr_ecpoint = NULL;
1842                 }
1843         else if (alg_k)
1844                 {
1845                 al=SSL_AD_UNEXPECTED_MESSAGE;
1846                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1847                 goto f_err;
1848                 }
1849 #endif /* !OPENSSL_NO_ECDH */
1850
1851
1852         /* p points to the next byte, there are 'n' bytes left */
1853
1854         /* if it was signed, check the signature */
1855         if (pkey != NULL)
1856                 {
1857                 if (SSL_USE_SIGALGS(s))
1858                         {
1859                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1860                         if (rv == -1)
1861                                 goto err;
1862                         else if (rv == 0)
1863                                 {
1864                                 al = SSL_AD_DECODE_ERROR;
1865                                 goto f_err;
1866                                 }
1867 #ifdef SSL_DEBUG
1868 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1869 #endif
1870                         p += 2;
1871                         n -= 2;
1872                         }
1873                 else
1874                         md = EVP_sha1();
1875
1876                 n2s(p,i);
1877                 n-=2;
1878                 j=EVP_PKEY_size(pkey);
1879
1880                 if ((i != n) || (n > j) || (n <= 0))
1881                         {
1882                         /* wrong packet length */
1883                         al=SSL_AD_DECODE_ERROR;
1884                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1885                         goto f_err;
1886                         }
1887
1888 #ifndef OPENSSL_NO_RSA
1889                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1890                         {
1891                         int num;
1892
1893                         j=0;
1894                         q=md_buf;
1895                         for (num=2; num > 0; num--)
1896                                 {
1897                                 EVP_MD_CTX_set_flags(&md_ctx,
1898                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1899                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1900                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1901                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1902                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1903                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1904                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1905                                 q+=i;
1906                                 j+=i;
1907                                 }
1908                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1909                                                                 pkey->pkey.rsa);
1910                         if (i < 0)
1911                                 {
1912                                 al=SSL_AD_DECRYPT_ERROR;
1913                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1914                                 goto f_err;
1915                                 }
1916                         if (i == 0)
1917                                 {
1918                                 /* bad signature */
1919                                 al=SSL_AD_DECRYPT_ERROR;
1920                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1921                                 goto f_err;
1922                                 }
1923                         }
1924                 else
1925 #endif
1926                         {
1927                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1928                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1929                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1930                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1931                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1932                                 {
1933                                 /* bad signature */
1934                                 al=SSL_AD_DECRYPT_ERROR;
1935                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1936                                 goto f_err;
1937                                 }
1938                         }
1939                 }
1940         else
1941                 {
1942                 /* aNULL or kPSK do not need public keys */
1943                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1944                         {
1945                         /* Might be wrong key type, check it */
1946                         if (ssl3_check_cert_and_algorithm(s))
1947                                 /* Otherwise this shouldn't happen */
1948                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1949                         goto err;
1950                         }
1951                 /* still data left over */
1952                 if (n != 0)
1953                         {
1954                         al=SSL_AD_DECODE_ERROR;
1955                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1956                         goto f_err;
1957                         }
1958                 }
1959         EVP_PKEY_free(pkey);
1960         EVP_MD_CTX_cleanup(&md_ctx);
1961         return(1);
1962 f_err:
1963         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1964 err:
1965         EVP_PKEY_free(pkey);
1966 #ifndef OPENSSL_NO_RSA
1967         if (rsa != NULL)
1968                 RSA_free(rsa);
1969 #endif
1970 #ifndef OPENSSL_NO_DH
1971         if (dh != NULL)
1972                 DH_free(dh);
1973 #endif
1974 #ifndef OPENSSL_NO_ECDH
1975         BN_CTX_free(bn_ctx);
1976         EC_POINT_free(srvr_ecpoint);
1977         if (ecdh != NULL)
1978                 EC_KEY_free(ecdh);
1979 #endif
1980         EVP_MD_CTX_cleanup(&md_ctx);
1981         return(-1);
1982         }
1983
1984 int ssl3_get_certificate_request(SSL *s)
1985         {
1986         int ok,ret=0;
1987         unsigned long n,nc,l;
1988         unsigned int llen, ctype_num,i;
1989         X509_NAME *xn=NULL;
1990         const unsigned char *p,*q;
1991         unsigned char *d;
1992         STACK_OF(X509_NAME) *ca_sk=NULL;
1993
1994         n=s->method->ssl_get_message(s,
1995                 SSL3_ST_CR_CERT_REQ_A,
1996                 SSL3_ST_CR_CERT_REQ_B,
1997                 -1,
1998                 s->max_cert_list,
1999                 &ok);
2000
2001         if (!ok) return((int)n);
2002
2003         s->s3->tmp.cert_req=0;
2004
2005         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2006                 {
2007                 s->s3->tmp.reuse_message=1;
2008                 /* If we get here we don't need any cached handshake records
2009                  * as we wont be doing client auth.
2010                  */
2011                 if (s->s3->handshake_buffer)
2012                         {
2013                         if (!ssl3_digest_cached_records(s))
2014                                 goto err;
2015                         }
2016                 return(1);
2017                 }
2018
2019         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2020                 {
2021                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2022                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2023                 goto err;
2024                 }
2025
2026         /* TLS does not like anon-DH with client cert */
2027         if (s->version > SSL3_VERSION)
2028                 {
2029                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2030                         {
2031                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2032                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2033                         goto err;
2034                         }
2035                 }
2036
2037         p=d=(unsigned char *)s->init_msg;
2038
2039         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2040                 {
2041                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2042                 goto err;
2043                 }
2044
2045         /* get the certificate types */
2046         ctype_num= *(p++);
2047         if (s->cert->ctypes)
2048                 {
2049                 OPENSSL_free(s->cert->ctypes);
2050                 s->cert->ctypes = NULL;
2051                 }
2052         if (ctype_num > SSL3_CT_NUMBER)
2053                 {
2054                 /* If we exceed static buffer copy all to cert structure */
2055                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2056                 memcpy(s->cert->ctypes, p, ctype_num);
2057                 s->cert->ctype_num = (size_t)ctype_num;
2058                 ctype_num=SSL3_CT_NUMBER;
2059                 }
2060         for (i=0; i<ctype_num; i++)
2061                 s->s3->tmp.ctype[i]= p[i];
2062         p+=p[-1];
2063         if (SSL_USE_SIGALGS(s))
2064                 {
2065                 n2s(p, llen);
2066                 /* Check we have enough room for signature algorithms and
2067                  * following length value.
2068                  */
2069                 if ((unsigned long)(p - d + llen + 2) > n)
2070                         {
2071                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2072                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2073                         goto err;
2074                         }
2075                 /* Clear certificate digests and validity flags */
2076                 for (i = 0; i < SSL_PKEY_NUM; i++)
2077                         {
2078                         s->cert->pkeys[i].digest = NULL;
2079                         s->cert->pkeys[i].valid_flags = 0;
2080                         }
2081                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2082                         {
2083                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2084                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2085                         goto err;
2086                         }
2087                 p += llen;
2088                 }
2089
2090         /* get the CA RDNs */
2091         n2s(p,llen);
2092 #if 0
2093 {
2094 FILE *out;
2095 out=fopen("/tmp/vsign.der","w");
2096 fwrite(p,1,llen,out);
2097 fclose(out);
2098 }
2099 #endif
2100
2101         if ((unsigned long)(p - d + llen) != n)
2102                 {
2103                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2104                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2105                 goto err;
2106                 }
2107
2108         for (nc=0; nc<llen; )
2109                 {
2110                 n2s(p,l);
2111                 if ((l+nc+2) > llen)
2112                         {
2113                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2114                                 goto cont; /* netscape bugs */
2115                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2116                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2117                         goto err;
2118                         }
2119
2120                 q=p;
2121
2122                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2123                         {
2124                         /* If netscape tolerance is on, ignore errors */
2125                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2126                                 goto cont;
2127                         else
2128                                 {
2129                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2130                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2131                                 goto err;
2132                                 }
2133                         }
2134
2135                 if (q != (p+l))
2136                         {
2137                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2138                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2139                         goto err;
2140                         }
2141                 if (!sk_X509_NAME_push(ca_sk,xn))
2142                         {
2143                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2144                         goto err;
2145                         }
2146
2147                 p+=l;
2148                 nc+=l+2;
2149                 }
2150
2151         if (0)
2152                 {
2153 cont:
2154                 ERR_clear_error();
2155                 }
2156
2157         /* we should setup a certificate to return.... */
2158         s->s3->tmp.cert_req=1;
2159         s->s3->tmp.ctype_num=ctype_num;
2160         if (s->s3->tmp.ca_names != NULL)
2161                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2162         s->s3->tmp.ca_names=ca_sk;
2163         ca_sk=NULL;
2164
2165         ret=1;
2166 err:
2167         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2168         return(ret);
2169         }
2170
2171 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2172         {
2173         return(X509_NAME_cmp(*a,*b));
2174         }
2175 #ifndef OPENSSL_NO_TLSEXT
2176 int ssl3_get_new_session_ticket(SSL *s)
2177         {
2178         int ok,al,ret=0, ticklen;
2179         long n;
2180         const unsigned char *p;
2181         unsigned char *d;
2182
2183         n=s->method->ssl_get_message(s,
2184                 SSL3_ST_CR_SESSION_TICKET_A,
2185                 SSL3_ST_CR_SESSION_TICKET_B,
2186                 -1,
2187                 16384,
2188                 &ok);
2189
2190         if (!ok)
2191                 return((int)n);
2192
2193         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2194                 {
2195                 s->s3->tmp.reuse_message=1;
2196                 return(1);
2197                 }
2198         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2199                 {
2200                 al=SSL_AD_UNEXPECTED_MESSAGE;
2201                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2202                 goto f_err;
2203                 }
2204         if (n < 6)
2205                 {
2206                 /* need at least ticket_lifetime_hint + ticket length */
2207                 al = SSL_AD_DECODE_ERROR;
2208                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2209                 goto f_err;
2210                 }
2211
2212         p=d=(unsigned char *)s->init_msg;
2213         n2l(p, s->session->tlsext_tick_lifetime_hint);
2214         n2s(p, ticklen);
2215         /* ticket_lifetime_hint + ticket_length + ticket */
2216         if (ticklen + 6 != n)
2217                 {
2218                 al = SSL_AD_DECODE_ERROR;
2219                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2220                 goto f_err;
2221                 }
2222         if (s->session->tlsext_tick)
2223                 {
2224                 OPENSSL_free(s->session->tlsext_tick);
2225                 s->session->tlsext_ticklen = 0;
2226                 }
2227         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2228         if (!s->session->tlsext_tick)
2229                 {
2230                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2231                 goto err;
2232                 }
2233         memcpy(s->session->tlsext_tick, p, ticklen);
2234         s->session->tlsext_ticklen = ticklen;
2235         /* There are two ways to detect a resumed ticket sesion.
2236          * One is to set an appropriate session ID and then the server
2237          * must return a match in ServerHello. This allows the normal
2238          * client session ID matching to work and we know much
2239          * earlier that the ticket has been accepted.
2240          *
2241          * The other way is to set zero length session ID when the
2242          * ticket is presented and rely on the handshake to determine
2243          * session resumption.
2244          *
2245          * We choose the former approach because this fits in with
2246          * assumptions elsewhere in OpenSSL. The session ID is set
2247          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2248          * ticket.
2249          */
2250         EVP_Digest(p, ticklen,
2251                         s->session->session_id, &s->session->session_id_length,
2252 #ifndef OPENSSL_NO_SHA256
2253                                                         EVP_sha256(), NULL);
2254 #else
2255                                                         EVP_sha1(), NULL);
2256 #endif
2257         ret=1;
2258         return(ret);
2259 f_err:
2260         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2261 err:
2262         return(-1);
2263         }
2264
2265 int ssl3_get_cert_status(SSL *s)
2266         {
2267         int ok, al;
2268         unsigned long resplen,n;
2269         const unsigned char *p;
2270
2271         n=s->method->ssl_get_message(s,
2272                 SSL3_ST_CR_CERT_STATUS_A,
2273                 SSL3_ST_CR_CERT_STATUS_B,
2274                 SSL3_MT_CERTIFICATE_STATUS,
2275                 16384,
2276                 &ok);
2277
2278         if (!ok) return((int)n);
2279         if (n < 4)
2280                 {
2281                 /* need at least status type + length */
2282                 al = SSL_AD_DECODE_ERROR;
2283                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2284                 goto f_err;
2285                 }
2286         p = (unsigned char *)s->init_msg;
2287         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2288                 {
2289                 al = SSL_AD_DECODE_ERROR;
2290                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2291                 goto f_err;
2292                 }
2293         n2l3(p, resplen);
2294         if (resplen + 4 != n)
2295                 {
2296                 al = SSL_AD_DECODE_ERROR;
2297                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2298                 goto f_err;
2299                 }
2300         if (s->tlsext_ocsp_resp)
2301                 OPENSSL_free(s->tlsext_ocsp_resp);
2302         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2303         if (!s->tlsext_ocsp_resp)
2304                 {
2305                 al = SSL_AD_INTERNAL_ERROR;
2306                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2307                 goto f_err;
2308                 }
2309         s->tlsext_ocsp_resplen = resplen;
2310         if (s->ctx->tlsext_status_cb)
2311                 {
2312                 int ret;
2313                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2314                 if (ret == 0)
2315                         {
2316                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2317                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2318                         goto f_err;
2319                         }
2320                 if (ret < 0)
2321                         {
2322                         al = SSL_AD_INTERNAL_ERROR;
2323                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2324                         goto f_err;
2325                         }
2326                 }
2327         return 1;
2328 f_err:
2329         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2330         return(-1);
2331         }
2332 #endif
2333
2334 int ssl3_get_server_done(SSL *s)
2335         {
2336         int ok,ret=0;
2337         long n;
2338
2339         n=s->method->ssl_get_message(s,
2340                 SSL3_ST_CR_SRVR_DONE_A,
2341                 SSL3_ST_CR_SRVR_DONE_B,
2342                 SSL3_MT_SERVER_DONE,
2343                 30, /* should be very small, like 0 :-) */
2344                 &ok);
2345
2346         if (!ok) return((int)n);
2347         if (n > 0)
2348                 {
2349                 /* should contain no data */
2350                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2351                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2352                 return -1;
2353                 }
2354         ret=1;
2355         return(ret);
2356         }
2357
2358
2359 int ssl3_send_client_key_exchange(SSL *s)
2360         {
2361         unsigned char *p;
2362         int n;
2363         unsigned long alg_k;
2364 #ifndef OPENSSL_NO_RSA
2365         unsigned char *q;
2366         EVP_PKEY *pkey=NULL;
2367 #endif
2368 #ifndef OPENSSL_NO_KRB5
2369         KSSL_ERR kssl_err;
2370 #endif /* OPENSSL_NO_KRB5 */
2371 #ifndef OPENSSL_NO_ECDH
2372         EC_KEY *clnt_ecdh = NULL;
2373         const EC_POINT *srvr_ecpoint = NULL;
2374         EVP_PKEY *srvr_pub_pkey = NULL;
2375         unsigned char *encodedPoint = NULL;
2376         int encoded_pt_len = 0;
2377         BN_CTX * bn_ctx = NULL;
2378 #endif
2379
2380         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2381                 {
2382                 p = ssl_handshake_start(s);
2383
2384                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2385
2386                 /* Fool emacs indentation */
2387                 if (0) {}
2388 #ifndef OPENSSL_NO_RSA
2389                 else if (alg_k & SSL_kRSA)
2390                         {
2391                         RSA *rsa;
2392                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2393
2394                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2395                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2396                         else
2397                                 {
2398                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2399                                 if ((pkey == NULL) ||
2400                                         (pkey->type != EVP_PKEY_RSA) ||
2401                                         (pkey->pkey.rsa == NULL))
2402                                         {
2403                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2404                                         goto err;
2405                                         }
2406                                 rsa=pkey->pkey.rsa;
2407                                 EVP_PKEY_free(pkey);
2408                                 }
2409
2410                         tmp_buf[0]=s->client_version>>8;
2411                         tmp_buf[1]=s->client_version&0xff;
2412                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2413                                         goto err;
2414
2415                         s->session->master_key_length=sizeof tmp_buf;
2416
2417                         q=p;
2418                         /* Fix buf for TLS and beyond */
2419                         if (s->version > SSL3_VERSION)
2420                                 p+=2;
2421                         n=RSA_public_encrypt(sizeof tmp_buf,
2422                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2423 #ifdef PKCS1_CHECK
2424                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2425                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2426 #endif
2427                         if (n <= 0)
2428                                 {
2429                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2430                                 goto err;
2431                                 }
2432
2433                         /* Fix buf for TLS and beyond */
2434                         if (s->version > SSL3_VERSION)
2435                                 {
2436                                 s2n(n,q);
2437                                 n+=2;
2438                                 }
2439
2440                         s->session->master_key_length=
2441                                 s->method->ssl3_enc->generate_master_secret(s,
2442                                         s->session->master_key,
2443                                         tmp_buf,sizeof tmp_buf);
2444                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2445                         }
2446 #endif
2447 #ifndef OPENSSL_NO_KRB5
2448                 else if (alg_k & SSL_kKRB5)
2449                         {
2450                         krb5_error_code krb5rc;
2451                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2452                         /*  krb5_data   krb5_ap_req;  */
2453                         krb5_data       *enc_ticket;
2454                         krb5_data       authenticator, *authp = NULL;
2455                         EVP_CIPHER_CTX  ciph_ctx;
2456                         const EVP_CIPHER *enc = NULL;
2457                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2458                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2459                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2460                                                 + EVP_MAX_IV_LENGTH];
2461                         int             padl, outl = sizeof(epms);
2462
2463                         EVP_CIPHER_CTX_init(&ciph_ctx);
2464
2465 #ifdef KSSL_DEBUG
2466                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2467                                 alg_k, SSL_kKRB5);
2468 #endif  /* KSSL_DEBUG */
2469
2470                         authp = NULL;
2471 #ifdef KRB5SENDAUTH
2472                         if (KRB5SENDAUTH)  authp = &authenticator;
2473 #endif  /* KRB5SENDAUTH */
2474
2475                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2476                                 &kssl_err);
2477                         enc = kssl_map_enc(kssl_ctx->enctype);
2478                         if (enc == NULL)
2479                             goto err;
2480 #ifdef KSSL_DEBUG
2481                         {
2482                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2483                         if (krb5rc && kssl_err.text)
2484                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2485                         }
2486 #endif  /* KSSL_DEBUG */
2487
2488                         if (krb5rc)
2489                                 {
2490                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2491                                                 SSL_AD_HANDSHAKE_FAILURE);
2492                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2493                                                 kssl_err.reason);
2494                                 goto err;
2495                                 }
2496
2497                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2498                         **  in place of RFC 2712 KerberosWrapper, as in:
2499                         **
2500                         **  Send ticket (copy to *p, set n = length)
2501                         **  n = krb5_ap_req.length;
2502                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2503                         **  if (krb5_ap_req.data)
2504                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2505                         **
2506                         **  Now using real RFC 2712 KerberosWrapper
2507                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2508                         **  Note: 2712 "opaque" types are here replaced
2509                         **  with a 2-byte length followed by the value.
2510                         **  Example:
2511                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2512                         **  Where "xx xx" = length bytes.  Shown here with
2513                         **  optional authenticator omitted.
2514                         */
2515
2516                         /*  KerberosWrapper.Ticket              */
2517                         s2n(enc_ticket->length,p);
2518                         memcpy(p, enc_ticket->data, enc_ticket->length);
2519                         p+= enc_ticket->length;
2520                         n = enc_ticket->length + 2;
2521
2522                         /*  KerberosWrapper.Authenticator       */
2523                         if (authp  &&  authp->length)
2524                                 {
2525                                 s2n(authp->length,p);
2526                                 memcpy(p, authp->data, authp->length);
2527                                 p+= authp->length;
2528                                 n+= authp->length + 2;
2529
2530                                 free(authp->data);
2531                                 authp->data = NULL;
2532                                 authp->length = 0;
2533                                 }
2534                         else
2535                                 {
2536                                 s2n(0,p);/*  null authenticator length  */
2537                                 n+=2;
2538                                 }
2539
2540                             tmp_buf[0]=s->client_version>>8;
2541                             tmp_buf[1]=s->client_version&0xff;
2542                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2543                                 goto err;
2544
2545                         /*  20010420 VRS.  Tried it this way; failed.
2546                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2547                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2548                         **                              kssl_ctx->length);
2549                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2550                         */
2551
2552                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2553                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2554                                 kssl_ctx->key,iv);
2555                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2556                                 sizeof tmp_buf);
2557                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2558                         outl += padl;
2559                         if (outl > (int)sizeof epms)
2560                                 {
2561                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2562                                 goto err;
2563                                 }
2564                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2565
2566                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2567                         s2n(outl,p);
2568                         memcpy(p, epms, outl);
2569                         p+=outl;
2570                         n+=outl + 2;
2571
2572                         s->session->master_key_length=
2573                                 s->method->ssl3_enc->generate_master_secret(s,
2574                                         s->session->master_key,
2575                                         tmp_buf, sizeof tmp_buf);
2576
2577                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2578                         OPENSSL_cleanse(epms, outl);
2579                         }
2580 #endif
2581 #ifndef OPENSSL_NO_DH
2582                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2583                         {
2584                         DH *dh_srvr,*dh_clnt;
2585                         SESS_CERT *scert = s->session->sess_cert;
2586
2587                         if (scert == NULL)
2588                                 {
2589                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2590                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2591                                 goto err;
2592                                 }
2593
2594                         if (scert->peer_dh_tmp != NULL)
2595                                 dh_srvr=scert->peer_dh_tmp;
2596                         else
2597                                 {
2598                                 /* we get them from the cert */
2599                                 int idx = scert->peer_cert_type;
2600                                 EVP_PKEY *spkey = NULL;
2601                                 dh_srvr = NULL;
2602                                 if (idx >= 0)
2603                                         spkey = X509_get_pubkey(
2604                                                 scert->peer_pkeys[idx].x509);
2605                                 if (spkey)
2606                                         {
2607                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2608                                         EVP_PKEY_free(spkey);
2609                                         }
2610                                 if (dh_srvr == NULL)
2611                                         {
2612                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2613                                             ERR_R_INTERNAL_ERROR);
2614                                         goto err;
2615                                         }
2616                                 }
2617                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2618                                 {
2619                                 /* Use client certificate key */
2620                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2621                                 dh_clnt = NULL;
2622                                 if (clkey)
2623                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2624                                 if (dh_clnt == NULL)
2625                                         {
2626                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2627                                             ERR_R_INTERNAL_ERROR);
2628                                         goto err;
2629                                         }
2630                                 }
2631                         else
2632                                 {
2633                                 /* generate a new random key */
2634                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2635                                         {
2636                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2637                                         goto err;
2638                                         }
2639                                 if (!DH_generate_key(dh_clnt))
2640                                         {
2641                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2642                                         DH_free(dh_clnt);
2643                                         goto err;
2644                                         }
2645                                 }
2646
2647                         /* use the 'p' output buffer for the DH key, but
2648                          * make sure to clear it out afterwards */
2649
2650                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2651                         if (scert->peer_dh_tmp == NULL)
2652                                 DH_free(dh_srvr);
2653
2654                         if (n <= 0)
2655                                 {
2656                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2657                                 DH_free(dh_clnt);
2658                                 goto err;
2659                                 }
2660
2661                         /* generate master key from the result */
2662                         s->session->master_key_length=
2663                                 s->method->ssl3_enc->generate_master_secret(s,
2664                                         s->session->master_key,p,n);
2665                         /* clean up */
2666                         memset(p,0,n);
2667
2668                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2669                                 n = 0;
2670                         else
2671                                 {
2672                                 /* send off the data */
2673                                 n=BN_num_bytes(dh_clnt->pub_key);
2674                                 s2n(n,p);
2675                                 BN_bn2bin(dh_clnt->pub_key,p);
2676                                 n+=2;
2677                                 }
2678
2679                         DH_free(dh_clnt);
2680
2681                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2682                         }
2683 #endif
2684
2685 #ifndef OPENSSL_NO_ECDH
2686                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2687                         {
2688                         const EC_GROUP *srvr_group = NULL;
2689                         EC_KEY *tkey;
2690                         int ecdh_clnt_cert = 0;
2691                         int field_size = 0;
2692
2693                         /* Did we send out the client's
2694                          * ECDH share for use in premaster
2695                          * computation as part of client certificate?
2696                          * If so, set ecdh_clnt_cert to 1.
2697                          */
2698                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2699                                 {
2700                                 /* XXX: For now, we do not support client
2701                                  * authentication using ECDH certificates.
2702                                  * To add such support, one needs to add
2703                                  * code that checks for appropriate
2704                                  * conditions and sets ecdh_clnt_cert to 1.
2705                                  * For example, the cert have an ECC
2706                                  * key on the same curve as the server's
2707                                  * and the key should be authorized for
2708                                  * key agreement.
2709                                  *
2710                                  * One also needs to add code in ssl3_connect
2711                                  * to skip sending the certificate verify
2712                                  * message.
2713                                  *
2714                                  * if ((s->cert->key->privatekey != NULL) &&
2715                                  *     (s->cert->key->privatekey->type ==
2716                                  *      EVP_PKEY_EC) && ...)
2717                                  * ecdh_clnt_cert = 1;
2718                                  */
2719                                 }
2720
2721                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2722                                 {
2723                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2724                                 }
2725                         else
2726                                 {
2727                                 /* Get the Server Public Key from Cert */
2728                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2729                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2730                                 if ((srvr_pub_pkey == NULL) ||
2731                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2732                                     (srvr_pub_pkey->pkey.ec == NULL))
2733                                         {
2734                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2735                                             ERR_R_INTERNAL_ERROR);
2736                                         goto err;
2737                                         }
2738
2739                                 tkey = srvr_pub_pkey->pkey.ec;
2740                                 }
2741
2742                         srvr_group   = EC_KEY_get0_group(tkey);
2743                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2744
2745                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2748                                     ERR_R_INTERNAL_ERROR);
2749                                 goto err;
2750                                 }
2751
2752                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2755                                 goto err;
2756                                 }
2757
2758                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2759                                 {
2760                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2761                                 goto err;
2762                                 }
2763                         if (ecdh_clnt_cert)
2764                                 {
2765                                 /* Reuse key info from our certificate
2766                                  * We only need our private key to perform
2767                                  * the ECDH computation.
2768                                  */
2769                                 const BIGNUM *priv_key;
2770                                 tkey = s->cert->key->privatekey->pkey.ec;
2771                                 priv_key = EC_KEY_get0_private_key(tkey);
2772                                 if (priv_key == NULL)
2773                                         {
2774                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2775                                         goto err;
2776                                         }
2777                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2778                                         {
2779                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2780                                         goto err;
2781                                         }
2782                                 }
2783                         else
2784                                 {
2785                                 /* Generate a new ECDH key pair */
2786                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2787                                         {
2788                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2789                                         goto err;
2790                                         }
2791                                 }
2792
2793                         /* use the 'p' output buffer for the ECDH key, but
2794                          * make sure to clear it out afterwards
2795                          */
2796
2797                         field_size = EC_GROUP_get_degree(srvr_group);
2798                         if (field_size <= 0)
2799                                 {
2800                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2801                                        ERR_R_ECDH_LIB);
2802                                 goto err;
2803                                 }
2804                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2805                         if (n <= 0)
2806                                 {
2807                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2808                                        ERR_R_ECDH_LIB);
2809                                 goto err;
2810                                 }
2811
2812                         /* generate master key from the result */
2813                         s->session->master_key_length = s->method->ssl3_enc \
2814                             -> generate_master_secret(s,
2815                                 s->session->master_key,
2816                                 p, n);
2817
2818                         memset(p, 0, n); /* clean up */
2819
2820                         if (ecdh_clnt_cert)
2821                                 {
2822                                 /* Send empty client key exch message */
2823                                 n = 0;
2824                                 }
2825                         else
2826                                 {
2827                                 /* First check the size of encoding and
2828                                  * allocate memory accordingly.
2829                                  */
2830                                 encoded_pt_len =
2831                                     EC_POINT_point2oct(srvr_group,
2832                                         EC_KEY_get0_public_key(clnt_ecdh),
2833                                         POINT_CONVERSION_UNCOMPRESSED,
2834                                         NULL, 0, NULL);
2835
2836                                 encodedPoint = (unsigned char *)
2837                                     OPENSSL_malloc(encoded_pt_len *
2838                                         sizeof(unsigned char));
2839                                 bn_ctx = BN_CTX_new();
2840                                 if ((encodedPoint == NULL) ||
2841                                     (bn_ctx == NULL))
2842                                         {
2843                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2844                                         goto err;
2845                                         }
2846
2847                                 /* Encode the public key */
2848                                 n = EC_POINT_point2oct(srvr_group,
2849                                     EC_KEY_get0_public_key(clnt_ecdh),
2850                                     POINT_CONVERSION_UNCOMPRESSED,
2851                                     encodedPoint, encoded_pt_len, bn_ctx);
2852
2853                                 *p = n; /* length of encoded point */
2854                                 /* Encoded point will be copied here */
2855                                 p += 1;
2856                                 /* copy the point */
2857                                 memcpy((unsigned char *)p, encodedPoint, n);
2858                                 /* increment n to account for length field */
2859                                 n += 1;
2860                                 }
2861
2862                         /* Free allocated memory */
2863                         BN_CTX_free(bn_ctx);
2864                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2865                         if (clnt_ecdh != NULL)
2866                                  EC_KEY_free(clnt_ecdh);
2867                         EVP_PKEY_free(srvr_pub_pkey);
2868                         }
2869 #endif /* !OPENSSL_NO_ECDH */
2870                 else if (alg_k & SSL_kGOST)
2871                         {
2872                         /* GOST key exchange message creation */
2873                         EVP_PKEY_CTX *pkey_ctx;
2874                         X509 *peer_cert;
2875                         size_t msglen;
2876                         unsigned int md_len;
2877                         int keytype;
2878                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2879                         EVP_MD_CTX *ukm_hash;
2880                         EVP_PKEY *pub_key;
2881
2882                         /* Get server sertificate PKEY and create ctx from it */
2883                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2884                         if (!peer_cert)
2885                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2886                         if (!peer_cert)         {
2887                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2888                                         goto err;
2889                                 }
2890
2891                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2892                         /* If we have send a certificate, and certificate key
2893
2894                          * parameters match those of server certificate, use
2895                          * certificate key for key exchange
2896                          */
2897
2898                          /* Otherwise, generate ephemeral key pair */
2899
2900                         EVP_PKEY_encrypt_init(pkey_ctx);
2901                           /* Generate session key */
2902                     RAND_bytes(premaster_secret,32);
2903                         /* If we have client certificate, use its secret as peer key */
2904                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2905                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2906                                         /* If there was an error - just ignore it. Ephemeral key
2907                                         * would be used
2908                                         */
2909                                         ERR_clear_error();
2910                                 }
2911                         }
2912                         /* Compute shared IV and store it in algorithm-specific
2913                          * context data */
2914                         ukm_hash = EVP_MD_CTX_create();
2915                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2916                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2917                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2918                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2919                         EVP_MD_CTX_destroy(ukm_hash);
2920                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2921                                 8,shared_ukm)<0) {
2922                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2923                                                 SSL_R_LIBRARY_BUG);
2924                                         goto err;
2925                                 }
2926                         /* Make GOST keytransport blob message */
2927                         /*Encapsulate it into sequence */
2928                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2929                         msglen=255;
2930                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2931                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2932                                         SSL_R_LIBRARY_BUG);
2933                                 goto err;
2934                         }
2935                         if (msglen >= 0x80)
2936                                 {
2937                                 *(p++)=0x81;
2938                                 *(p++)= msglen & 0xff;
2939                                 n=msglen+3;
2940                                 }
2941                         else
2942                                 {
2943                                 *(p++)= msglen & 0xff;
2944                                 n=msglen+2;
2945                                 }
2946                         memcpy(p, tmp, msglen);
2947                         /* Check if pubkey from client certificate was used */
2948                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2949                                 {
2950                                 /* Set flag "skip certificate verify" */
2951                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2952                                 }
2953                         EVP_PKEY_CTX_free(pkey_ctx);
2954                         s->session->master_key_length=
2955                                 s->method->ssl3_enc->generate_master_secret(s,
2956                                         s->session->master_key,premaster_secret,32);
2957                         EVP_PKEY_free(pub_key);
2958
2959                         }
2960 #ifndef OPENSSL_NO_SRP
2961                 else if (alg_k & SSL_kSRP)
2962                         {
2963                         if (s->srp_ctx.A != NULL)
2964                                 {
2965                                 /* send off the data */
2966                                 n=BN_num_bytes(s->srp_ctx.A);
2967                                 s2n(n,p);
2968                                 BN_bn2bin(s->srp_ctx.A,p);
2969                                 n+=2;
2970                                 }
2971                         else
2972                                 {
2973                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2974                                 goto err;
2975                                 }
2976                         if (s->session->srp_username != NULL)
2977                                 OPENSSL_free(s->session->srp_username);
2978                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2979                         if (s->session->srp_username == NULL)
2980                                 {
2981                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2982                                         ERR_R_MALLOC_FAILURE);
2983                                 goto err;
2984                                 }
2985
2986                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2987                                 {
2988                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2989                                 goto err;
2990                                 }
2991                         }
2992 #endif
2993 #ifndef OPENSSL_NO_PSK
2994                 else if (alg_k & SSL_kPSK)
2995                         {
2996                         char identity[PSK_MAX_IDENTITY_LEN];
2997                         unsigned char *t = NULL;
2998                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2999                         unsigned int pre_ms_len = 0, psk_len = 0;
3000                         int psk_err = 1;
3001
3002                         n = 0;
3003                         if (s->psk_client_callback == NULL)
3004                                 {
3005                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3006                                         SSL_R_PSK_NO_CLIENT_CB);
3007                                 goto err;
3008                                 }
3009
3010                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3011                                 identity, PSK_MAX_IDENTITY_LEN,
3012                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3013                         if (psk_len > PSK_MAX_PSK_LEN)
3014                                 {
3015                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3016                                         ERR_R_INTERNAL_ERROR);
3017                                 goto psk_err;
3018                                 }
3019                         else if (psk_len == 0)
3020                                 {
3021                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3022                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3023                                 goto psk_err;
3024                                 }
3025
3026                         /* create PSK pre_master_secret */
3027                         pre_ms_len = 2+psk_len+2+psk_len;
3028                         t = psk_or_pre_ms;
3029                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3030                         s2n(psk_len, t);
3031                         memset(t, 0, psk_len);
3032                         t+=psk_len;
3033                         s2n(psk_len, t);
3034
3035                         if (s->session->psk_identity_hint != NULL)
3036                                 OPENSSL_free(s->session->psk_identity_hint);
3037                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3038                         if (s->ctx->psk_identity_hint != NULL &&
3039                                 s->session->psk_identity_hint == NULL)
3040                                 {
3041                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3042                                         ERR_R_MALLOC_FAILURE);
3043                                 goto psk_err;
3044                                 }
3045
3046                         if (s->session->psk_identity != NULL)
3047                                 OPENSSL_free(s->session->psk_identity);
3048                         s->session->psk_identity = BUF_strdup(identity);
3049                         if (s->session->psk_identity == NULL)
3050                                 {
3051                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3052                                         ERR_R_MALLOC_FAILURE);
3053                                 goto psk_err;
3054                                 }
3055
3056                         s->session->master_key_length =
3057                                 s->method->ssl3_enc->generate_master_secret(s,
3058                                         s->session->master_key,
3059                                         psk_or_pre_ms, pre_ms_len);
3060                         n = strlen(identity);
3061                         s2n(n, p);
3062                         memcpy(p, identity, n);
3063                         n+=2;
3064                         psk_err = 0;
3065                 psk_err:
3066                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
3067                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3068                         if (psk_err != 0)
3069                                 {
3070                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3071                                 goto err;
3072                                 }
3073                         }
3074 #endif
3075                 else
3076                         {
3077                         ssl3_send_alert(s, SSL3_AL_FATAL,
3078                             SSL_AD_HANDSHAKE_FAILURE);
3079                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3080                             ERR_R_INTERNAL_ERROR);
3081                         goto err;
3082                         }
3083
3084                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3085                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3086                 }
3087
3088         /* SSL3_ST_CW_KEY_EXCH_B */
3089         return ssl_do_write(s);
3090 err:
3091 #ifndef OPENSSL_NO_ECDH
3092         BN_CTX_free(bn_ctx);
3093         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3094         if (clnt_ecdh != NULL)
3095                 EC_KEY_free(clnt_ecdh);
3096         EVP_PKEY_free(srvr_pub_pkey);
3097 #endif
3098         return(-1);
3099         }
3100
3101 int ssl3_send_client_verify(SSL *s)
3102         {
3103         unsigned char *p;
3104         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3105         EVP_PKEY *pkey;
3106         EVP_PKEY_CTX *pctx=NULL;
3107         EVP_MD_CTX mctx;
3108         unsigned u=0;
3109         unsigned long n;
3110         int j;
3111
3112         EVP_MD_CTX_init(&mctx);
3113
3114         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3115                 {
3116                 p= ssl_handshake_start(s);
3117                 pkey=s->cert->key->privatekey;
3118 /* Create context from key and test if sha1 is allowed as digest */
3119                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3120                 EVP_PKEY_sign_init(pctx);
3121                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3122                         {
3123                         if (!SSL_USE_SIGALGS(s))
3124                                 s->method->ssl3_enc->cert_verify_mac(s,
3125                                                 NID_sha1,
3126                                                 &(data[MD5_DIGEST_LENGTH]));
3127                         }
3128                 else
3129                         {
3130                         ERR_clear_error();
3131                         }
3132                 /* For TLS v1.2 send signature algorithm and signature
3133                  * using agreed digest and cached handshake records.
3134                  */
3135                 if (SSL_USE_SIGALGS(s))
3136                         {
3137                         long hdatalen = 0;
3138                         void *hdata;
3139                         const EVP_MD *md = s->cert->key->digest;
3140                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3141                                                                 &hdata);
3142                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3143                                 {
3144                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3145                                                 ERR_R_INTERNAL_ERROR);
3146                                 goto err;
3147                                 }
3148                         p += 2;
3149 #ifdef SSL_DEBUG
3150                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3151                                                         EVP_MD_name(md));
3152 #endif
3153                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3154                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3155                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3156                                 {
3157                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3158                                                 ERR_R_EVP_LIB);
3159                                 goto err;
3160                                 }
3161                         s2n(u,p);
3162                         n = u + 4;
3163                         if (!ssl3_digest_cached_records(s))
3164                                 goto err;
3165                         }
3166                 else
3167 #ifndef OPENSSL_NO_RSA
3168                 if (pkey->type == EVP_PKEY_RSA)
3169                         {
3170                         s->method->ssl3_enc->cert_verify_mac(s,
3171                                 NID_md5,
3172                                 &(data[0]));
3173                         if (RSA_sign(NID_md5_sha1, data,
3174                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3175                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3176                                 {
3177                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3178                                 goto err;
3179                                 }
3180                         s2n(u,p);
3181                         n=u+2;
3182                         }
3183                 else
3184 #endif
3185 #ifndef OPENSSL_NO_DSA
3186                         if (pkey->type == EVP_PKEY_DSA)
3187                         {
3188                         if (!DSA_sign(pkey->save_type,
3189                                 &(data[MD5_DIGEST_LENGTH]),
3190                                 SHA_DIGEST_LENGTH,&(p[2]),
3191                                 (unsigned int *)&j,pkey->pkey.dsa))
3192                                 {
3193                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3194                                 goto err;
3195                                 }
3196                         s2n(j,p);
3197                         n=j+2;
3198                         }
3199                 else
3200 #endif
3201 #ifndef OPENSSL_NO_ECDSA
3202                         if (pkey->type == EVP_PKEY_EC)
3203                         {
3204                         if (!ECDSA_sign(pkey->save_type,
3205                                 &(data[MD5_DIGEST_LENGTH]),
3206                                 SHA_DIGEST_LENGTH,&(p[2]),
3207                                 (unsigned int *)&j,pkey->pkey.ec))
3208                                 {
3209                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3210                                     ERR_R_ECDSA_LIB);
3211                                 goto err;
3212                                 }
3213                         s2n(j,p);
3214                         n=j+2;
3215                         }
3216                 else
3217 #endif
3218                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3219                 {
3220                 unsigned char signbuf[64];
3221                 int i;
3222                 size_t sigsize=64;
3223                 s->method->ssl3_enc->cert_verify_mac(s,
3224                         NID_id_GostR3411_94,
3225                         data);
3226                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3227                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3228                         ERR_R_INTERNAL_ERROR);
3229                         goto err;
3230                 }
3231                 for (i=63,j=0; i>=0; j++, i--) {
3232                         p[2+j]=signbuf[i];
3233                 }
3234                 s2n(j,p);
3235                 n=j+2;
3236                 }
3237                 else
3238                 {
3239                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3240                         goto err;
3241                 }
3242                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3243                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3244                 }
3245         EVP_MD_CTX_cleanup(&mctx);
3246         EVP_PKEY_CTX_free(pctx);
3247         return ssl_do_write(s);
3248 err:
3249         EVP_MD_CTX_cleanup(&mctx);
3250         EVP_PKEY_CTX_free(pctx);
3251         return(-1);
3252         }
3253
3254 /* Check a certificate can be used for client authentication. Currently
3255  * check cert exists, if we have a suitable digest for TLS 1.2 if
3256  * static DH client certificates can be used and optionally checks
3257  * suitability for Suite B.
3258  */
3259 static int ssl3_check_client_certificate(SSL *s)
3260         {
3261         unsigned long alg_k;
3262         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3263                 return 0;
3264         /* If no suitable signature algorithm can't use certificate */
3265         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3266                 return 0;
3267         /* If strict mode check suitability of chain before using it.
3268          * This also adjusts suite B digest if necessary.
3269          */
3270         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3271                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3272                 return 0;
3273         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3274         /* See if we can use client certificate for fixed DH */
3275         if (alg_k & (SSL_kDHr|SSL_kDHd))
3276                 {
3277                 SESS_CERT *scert = s->session->sess_cert;
3278                 int i = scert->peer_cert_type;
3279                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3280                 clkey = s->cert->key->privatekey;
3281                 /* If client key not DH assume it can be used */
3282                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3283                         return 1;
3284                 if (i >= 0)
3285                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3286                 if (spkey)
3287                         {
3288                         /* Compare server and client parameters */
3289                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3290                         EVP_PKEY_free(spkey);
3291                         if (i != 1)
3292                                 return 0;
3293                         }
3294                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3295                 }
3296         return 1;
3297         }
3298
3299 int ssl3_send_client_certificate(SSL *s)
3300         {
3301         X509 *x509=NULL;
3302         EVP_PKEY *pkey=NULL;
3303         int i;
3304
3305         if (s->state == SSL3_ST_CW_CERT_A)
3306                 {
3307                 /* Let cert callback update client certificates if required */
3308                 if (s->cert->cert_cb
3309                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
3310                         {
3311                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3312                         return 0;
3313                         }
3314                 if (ssl3_check_client_certificate(s))
3315                         s->state=SSL3_ST_CW_CERT_C;
3316                 else
3317                         s->state=SSL3_ST_CW_CERT_B;
3318                 }
3319
3320         /* We need to get a client cert */
3321         if (s->state == SSL3_ST_CW_CERT_B)
3322                 {
3323                 /* If we get an error, we need to
3324                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3325                  * We then get retied later */
3326                 i=0;
3327                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3328                 if (i < 0)
3329                         {
3330                         s->rwstate=SSL_X509_LOOKUP;
3331                         return(-1);
3332                         }
3333                 s->rwstate=SSL_NOTHING;
3334                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3335                         {
3336                         s->state=SSL3_ST_CW_CERT_B;
3337                         if (    !SSL_use_certificate(s,x509) ||
3338                                 !SSL_use_PrivateKey(s,pkey))
3339                                 i=0;
3340                         }
3341                 else if (i == 1)
3342                         {
3343                         i=0;
3344                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3345                         }
3346
3347                 if (x509 != NULL) X509_free(x509);
3348                 if (pkey != NULL) EVP_PKEY_free(pkey);
3349                 if (i && !ssl3_check_client_certificate(s))
3350                         i = 0;
3351                 if (i == 0)
3352                         {
3353                         if (s->version == SSL3_VERSION)
3354                                 {
3355                                 s->s3->tmp.cert_req=0;
3356                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3357                                 return(1);
3358                                 }
3359                         else
3360                                 {
3361                                 s->s3->tmp.cert_req=2;
3362                                 }
3363                         }
3364
3365                 /* Ok, we have a cert */
3366                 s->state=SSL3_ST_CW_CERT_C;
3367                 }
3368
3369         if (s->state == SSL3_ST_CW_CERT_C)
3370                 {
3371                 s->state=SSL3_ST_CW_CERT_D;
3372                 ssl3_output_cert_chain(s,
3373                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3374                 }
3375         /* SSL3_ST_CW_CERT_D */
3376         return ssl_do_write(s);
3377         }
3378
3379 #define has_bits(i,m)   (((i)&(m)) == (m))
3380
3381 int ssl3_check_cert_and_algorithm(SSL *s)
3382         {
3383         int i,idx;
3384         long alg_k,alg_a;
3385         EVP_PKEY *pkey=NULL;
3386         SESS_CERT *sc;
3387 #ifndef OPENSSL_NO_RSA
3388         RSA *rsa;
3389 #endif
3390 #ifndef OPENSSL_NO_DH
3391         DH *dh;
3392 #endif
3393
3394         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3395         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3396
3397         /* we don't have a certificate */
3398         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3399                 return(1);
3400
3401         sc=s->session->sess_cert;
3402         if (sc == NULL)
3403                 {
3404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3405                 goto err;
3406                 }
3407
3408 #ifndef OPENSSL_NO_RSA
3409         rsa=s->session->sess_cert->peer_rsa_tmp;
3410 #endif
3411 #ifndef OPENSSL_NO_DH
3412         dh=s->session->sess_cert->peer_dh_tmp;
3413 #endif
3414
3415         /* This is the passed certificate */
3416
3417         idx=sc->peer_cert_type;
3418 #ifndef OPENSSL_NO_ECDH
3419         if (idx == SSL_PKEY_ECC)
3420                 {
3421                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3422                                                                 s) == 0)
3423                         { /* check failed */
3424                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3425                         goto f_err;
3426                         }
3427                 else
3428                         {
3429                         return 1;
3430                         }
3431                 }
3432         else if (alg_a & SSL_aECDSA)
3433                 {
3434                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3435                 goto f_err;
3436                 }
3437         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3438                 {
3439                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3440                 goto f_err;
3441                 }
3442 #endif
3443         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3444         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3445         EVP_PKEY_free(pkey);
3446
3447
3448         /* Check that we have a certificate if we require one */
3449         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3450                 {
3451                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3452                 goto f_err;
3453                 }
3454 #ifndef OPENSSL_NO_DSA
3455         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3456                 {
3457                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3458                 goto f_err;
3459                 }
3460 #endif
3461 #ifndef OPENSSL_NO_RSA
3462         if ((alg_k & SSL_kRSA) &&
3463                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3464                 {
3465                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3466                 goto f_err;
3467                 }
3468 #endif
3469 #ifndef OPENSSL_NO_DH
3470         if ((alg_k & SSL_kEDH) &&
3471                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3472                 {
3473                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3474                 goto f_err;
3475                 }
3476         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3477                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3478                 {
3479                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3480                 goto f_err;
3481                 }
3482 #ifndef OPENSSL_NO_DSA
3483         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3484                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3485                 {
3486                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3487                 goto f_err;
3488                 }
3489 #endif
3490 #endif
3491
3492         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3493                 {
3494 #ifndef OPENSSL_NO_RSA
3495                 if (alg_k & SSL_kRSA)
3496                         {
3497                         if (rsa == NULL
3498                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3499                                 {
3500                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3501                                 goto f_err;
3502                                 }
3503                         }
3504                 else
3505 #endif
3506 #ifndef OPENSSL_NO_DH
3507                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3508                             {
3509                             if (dh == NULL
3510                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3511                                 {
3512                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3513                                 goto f_err;
3514                                 }
3515                         }
3516                 else
3517 #endif
3518                         {
3519                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3520                         goto f_err;
3521                         }
3522                 }
3523         return(1);
3524 f_err:
3525         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3526 err:
3527         return(0);
3528         }
3529
3530 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3531 int ssl3_send_next_proto(SSL *s)
3532         {
3533         unsigned int len, padding_len;
3534         unsigned char *d;
3535
3536         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3537                 {
3538                 len = s->next_proto_negotiated_len;
3539                 padding_len = 32 - ((len + 2) % 32);
3540                 d = (unsigned char *)s->init_buf->data;
3541                 d[4] = len;
3542                 memcpy(d + 5, s->next_proto_negotiated, len);
3543                 d[5 + len] = padding_len;
3544                 memset(d + 6 + len, 0, padding_len);
3545                 *(d++)=SSL3_MT_NEXT_PROTO;
3546                 l2n3(2 + len + padding_len, d);
3547                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3548                 s->init_num = 4 + 2 + len + padding_len;
3549                 s->init_off = 0;
3550                 }
3551
3552         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3553 }
3554 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3555
3556 /* Check to see if handshake is full or resumed. Usually this is just a
3557  * case of checking to see if a cache hit has occurred. In the case of
3558  * session tickets we have to check the next message to be sure.
3559  */
3560
3561 #ifndef OPENSSL_NO_TLSEXT
3562 int ssl3_check_finished(SSL *s)
3563         {
3564         int ok;
3565         long n;
3566         /* If we have no ticket it cannot be a resumed session. */
3567         if (!s->session->tlsext_tick)
3568                 return 1;
3569         /* this function is called when we really expect a Certificate
3570          * message, so permit appropriate message length */
3571         n=s->method->ssl_get_message(s,
3572                 SSL3_ST_CR_CERT_A,
3573                 SSL3_ST_CR_CERT_B,
3574                 -1,
3575                 s->max_cert_list,
3576                 &ok);
3577         if (!ok) return((int)n);
3578         s->s3->tmp.reuse_message = 1;
3579         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3580                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3581                 return 2;
3582
3583         return 1;
3584         }
3585 #endif
3586
3587 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3588         {
3589         int i = 0;
3590 #ifndef OPENSSL_NO_ENGINE
3591         if (s->ctx->client_cert_engine)
3592                 {
3593                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3594                                                 SSL_get_client_CA_list(s),
3595                                                 px509, ppkey, NULL, NULL, NULL);
3596                 if (i != 0)
3597                         return i;
3598                 }
3599 #endif
3600         if (s->ctx->client_cert_cb)
3601                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3602         return i;
3603         }
3604
3605 #ifndef OPENSSL_NO_TLSEXT
3606 int tls1_get_server_supplemental_data(SSL *s)
3607         {
3608         int al;
3609         int ok;
3610         unsigned long supp_data_len, authz_data_len;
3611         long n;
3612         unsigned short supp_data_type, authz_data_type, proof_len;
3613         const unsigned char *p;
3614         unsigned char *new_proof;
3615
3616         n=s->method->ssl_get_message(s,
3617                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3618                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3619                 SSL3_MT_SUPPLEMENTAL_DATA,
3620                 /* use default limit */
3621                 TLSEXT_MAXLEN_supplemental_data,
3622                 &ok);
3623
3624         if (!ok) return((int)n);
3625
3626         p = (unsigned char *)s->init_msg;
3627
3628         /* The message cannot be empty */
3629         if (n < 3)
3630                 {
3631                 al = SSL_AD_DECODE_ERROR;
3632                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3633                 goto f_err;
3634                 }
3635         /* Length of supplemental data */
3636         n2l3(p,supp_data_len);
3637         n -= 3;
3638         /* We must have at least one supplemental data entry
3639          * with type (1 byte) and length (2 bytes). */
3640         if (supp_data_len != (unsigned long) n || n < 4)
3641                 {
3642                 al = SSL_AD_DECODE_ERROR;
3643                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3644                 goto f_err;
3645                 }
3646         /* Supplemental data type: must be authz_data */
3647         n2s(p,supp_data_type);
3648         n -= 2;
3649         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3650                 {
3651                 al = SSL_AD_UNEXPECTED_MESSAGE;
3652                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3653                 goto f_err;
3654                 }
3655         /* Authz data length */
3656         n2s(p, authz_data_len);
3657         n -= 2;
3658         if (authz_data_len != (unsigned long) n || n < 1)
3659                 {
3660                 al = SSL_AD_DECODE_ERROR;
3661                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3662                 goto f_err;
3663                 }
3664         /* Authz data type: must be audit_proof */
3665         authz_data_type = *(p++);
3666         n -= 1;
3667         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3668                 {
3669                 al=SSL_AD_UNEXPECTED_MESSAGE;
3670                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3671                 goto f_err;
3672                 }
3673         /* We have a proof: read its length */
3674         if (n < 2)
3675                 {
3676                 al = SSL_AD_DECODE_ERROR;
3677                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3678                 goto f_err;
3679                 }
3680         n2s(p, proof_len);
3681         n -= 2;
3682         if (proof_len != (unsigned long) n)
3683                 {
3684                 al = SSL_AD_DECODE_ERROR;
3685                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3686                 goto f_err;
3687                 }
3688         /* Store the proof */
3689         new_proof = OPENSSL_realloc(s->session->audit_proof,
3690                                     proof_len);
3691         if (new_proof == NULL)
3692                 {
3693                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3694                 return 0;
3695                 }
3696         s->session->audit_proof_length = proof_len;
3697         s->session->audit_proof = new_proof;
3698         memcpy(s->session->audit_proof, p, proof_len);
3699
3700         /* Got the proof, but can't verify it yet. */
3701         return 1;
3702 f_err:
3703         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3704         return -1;
3705         }
3706 #endif