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 int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 171
 172 #ifndef OPENSSL_NO_SSL3_METHOD
 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 #endif
 186
 187 int ssl3_connect(SSL *s)
 188         {
 189         BUF_MEM *buf=NULL;
 190         unsigned long Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         s->in_handshake++;
 205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 206
 207 #ifndef OPENSSL_NO_HEARTBEATS
 208         /* If we're awaiting a HeartbeatResponse, pretend we
 209          * already got and don't await it anymore, because
 210          * Heartbeats don't make sense during handshakes anyway.
 211          */
 212         if (s->tlsext_hb_pending)
 213                 {
 214                 s->tlsext_hb_pending = 0;
 215                 s->tlsext_hb_seq++;
 216                 }
 217 #endif
 218
 219         for (;;)
 220                 {
 221                 state=s->state;
 222
 223                 switch(s->state)
 224                         {
 225                 case SSL_ST_RENEGOTIATE:
 226                         s->renegotiate=1;
 227                         s->state=SSL_ST_CONNECT;
 228                         s->ctx->stats.sess_connect_renegotiate++;
 229                         /* break */
 230                 case SSL_ST_BEFORE:
 231                 case SSL_ST_CONNECT:
 232                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 233                 case SSL_ST_OK|SSL_ST_CONNECT:
 234
 235                         s->server=0;
 236                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 237
 238                         if ((s->version & 0xff00 ) != 0x0300)
 239                                 {
 240                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 241                                 ret = -1;
 242                                 goto end;
 243                                 }
 244
 245                         /* s->version=SSL3_VERSION; */
 246                         s->type=SSL_ST_CONNECT;
 247
 248                         if (s->init_buf == NULL)
 249                                 {
 250                                 if ((buf=BUF_MEM_new()) == NULL)
 251                                         {
 252                                         ret= -1;
 253                                         goto end;
 254                                         }
 255                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 256                                         {
 257                                         ret= -1;
 258                                         goto end;
 259                                         }
 260                                 s->init_buf=buf;
 261                                 buf=NULL;
 262                                 }
 263
 264                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 265
 266                         /* setup buffing BIO */
 267                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 268
 269                         /* don't push the buffering BIO quite yet */
 270
 271                         ssl3_init_finished_mac(s);
 272
 273                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 274                         s->ctx->stats.sess_connect++;
 275                         s->init_num=0;
 276                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 277                         /* Should have been reset by ssl3_get_finished, too. */
 278                         s->s3->change_cipher_spec = 0;
 279                         break;
 280
 281                 case SSL3_ST_CW_CLNT_HELLO_A:
 282                 case SSL3_ST_CW_CLNT_HELLO_B:
 283
 284                         s->shutdown=0;
 285                         ret=ssl3_client_hello(s);
 286                         if (ret <= 0) goto end;
 287                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 288                         s->init_num=0;
 289
 290                         /* turn on buffering for the next lot of output */
 291                         if (s->bbio != s->wbio)
 292                                 s->wbio=BIO_push(s->bbio,s->wbio);
 293
 294                         break;
 295
 296                 case SSL3_ST_CR_SRVR_HELLO_A:
 297                 case SSL3_ST_CR_SRVR_HELLO_B:
 298                         ret=ssl3_get_server_hello(s);
 299                         if (ret <= 0) goto end;
 300
 301                         if (s->hit)
 302                                 {
 303                                 s->state=SSL3_ST_CR_FINISHED_A;
 304 #ifndef OPENSSL_NO_TLSEXT
 305                                 if (s->tlsext_ticket_expected)
 306                                         {
 307                                         /* receive renewed session ticket */
 308                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 309                                         }
 310 #endif
 311                                 }
 312                         else
 313                                 {
 314                                         s->state=SSL3_ST_CR_CERT_A;
 315                                 }
 316                         s->init_num=0;
 317                         break;
 318                 case SSL3_ST_CR_CERT_A:
 319                 case SSL3_ST_CR_CERT_B:
 320                         /* Check if it is anon DH/ECDH, SRP auth */
 321                         /* or PSK */
 322                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 323                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 324                                 {
 325                                 ret=ssl3_get_server_certificate(s);
 326                                 if (ret <= 0) goto end;
 327 #ifndef OPENSSL_NO_TLSEXT
 328                                 if (s->tlsext_status_expected)
 329                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 330                                 else
 331                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 332                                 }
 333                         else
 334                                 {
 335                                 skip = 1;
 336                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 337                                 }
 338 #else
 339                                 }
 340                         else
 341                                 skip=1;
 342
 343                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 344 #endif
 345                         s->init_num=0;
 346                         break;
 347
 348                 case SSL3_ST_CR_KEY_EXCH_A:
 349                 case SSL3_ST_CR_KEY_EXCH_B:
 350                         ret=ssl3_get_key_exchange(s);
 351                         if (ret <= 0) goto end;
 352                         s->state=SSL3_ST_CR_CERT_REQ_A;
 353                         s->init_num=0;
 354
 355                         /* at this point we check that we have the
 356                          * required stuff from the server */
 357                         if (!ssl3_check_cert_and_algorithm(s))
 358                                 {
 359                                 ret= -1;
 360                                 goto end;
 361                                 }
 362                         break;
 363
 364                 case SSL3_ST_CR_CERT_REQ_A:
 365                 case SSL3_ST_CR_CERT_REQ_B:
 366                         ret=ssl3_get_certificate_request(s);
 367                         if (ret <= 0) goto end;
 368                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 369                         s->init_num=0;
 370                         break;
 371
 372                 case SSL3_ST_CR_SRVR_DONE_A:
 373                 case SSL3_ST_CR_SRVR_DONE_B:
 374                         ret=ssl3_get_server_done(s);
 375                         if (ret <= 0) goto end;
 376 #ifndef OPENSSL_NO_SRP
 377                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 378                                 {
 379                                 if ((ret = SRP_Calc_A_param(s))<=0)
 380                                         {
 381                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 382                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 383                                         goto end;
 384                                         }
 385                                 }
 386 #endif
 387                         if (s->s3->tmp.cert_req)
 388                                 s->state=SSL3_ST_CW_CERT_A;
 389                         else
 390                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 391                         s->init_num=0;
 392
 393                         break;
 394
 395                 case SSL3_ST_CW_CERT_A:
 396                 case SSL3_ST_CW_CERT_B:
 397                 case SSL3_ST_CW_CERT_C:
 398                 case SSL3_ST_CW_CERT_D:
 399                         ret=ssl3_send_client_certificate(s);
 400                         if (ret <= 0) goto end;
 401                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 402                         s->init_num=0;
 403                         break;
 404
 405                 case SSL3_ST_CW_KEY_EXCH_A:
 406                 case SSL3_ST_CW_KEY_EXCH_B:
 407                         ret=ssl3_send_client_key_exchange(s);
 408                         if (ret <= 0) goto end;
 409                         /* EAY EAY EAY need to check for DH fix cert
 410                          * sent back */
 411                         /* For TLS, cert_req is set to 2, so a cert chain
 412                          * of nothing is sent, but no verify packet is sent */
 413                         /* XXX: For now, we do not support client
 414                          * authentication in ECDH cipher suites with
 415                          * ECDH (rather than ECDSA) certificates.
 416                          * We need to skip the certificate verify
 417                          * message when client's ECDH public key is sent
 418                          * inside the client certificate.
 419                          */
 420                         if (s->s3->tmp.cert_req == 1)
 421                                 {
 422                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 423                                 }
 424                         else
 425                                 {
 426                                 s->state=SSL3_ST_CW_CHANGE_A;
 427                                 }
 428                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 429                                 {
 430                                 s->state=SSL3_ST_CW_CHANGE_A;
 431                                 }
 432
 433                         s->init_num=0;
 434                         break;
 435
 436                 case SSL3_ST_CW_CERT_VRFY_A:
 437                 case SSL3_ST_CW_CERT_VRFY_B:
 438                         ret=ssl3_send_client_verify(s);
 439                         if (ret <= 0) goto end;
 440                         s->state=SSL3_ST_CW_CHANGE_A;
 441                         s->init_num=0;
 442                         break;
 443
 444                 case SSL3_ST_CW_CHANGE_A:
 445                 case SSL3_ST_CW_CHANGE_B:
 446                         ret=ssl3_send_change_cipher_spec(s,
 447                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 448                         if (ret <= 0) goto end;
 449
 450 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 451                         s->state=SSL3_ST_CW_FINISHED_A;
 452 #else
 453                         if (s->s3->next_proto_neg_seen)
 454                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 455                         else
 456                                 s->state=SSL3_ST_CW_FINISHED_A;
 457 #endif
 458                         s->init_num=0;
 459
 460                         s->session->cipher=s->s3->tmp.new_cipher;
 461 #ifdef OPENSSL_NO_COMP
 462                         s->session->compress_meth=0;
 463 #else
 464                         if (s->s3->tmp.new_compression == NULL)
 465                                 s->session->compress_meth=0;
 466                         else
 467                                 s->session->compress_meth=
 468                                         s->s3->tmp.new_compression->id;
 469 #endif
 470                         if (!s->method->ssl3_enc->setup_key_block(s))
 471                                 {
 472                                 ret= -1;
 473                                 goto end;
 474                                 }
 475
 476                         if (!s->method->ssl3_enc->change_cipher_state(s,
 477                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 478                                 {
 479                                 ret= -1;
 480                                 goto end;
 481                                 }
 482
 483                         break;
 484
 485 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 486                 case SSL3_ST_CW_NEXT_PROTO_A:
 487                 case SSL3_ST_CW_NEXT_PROTO_B:
 488                         ret=ssl3_send_next_proto(s);
 489                         if (ret <= 0) goto end;
 490                         s->state=SSL3_ST_CW_FINISHED_A;
 491                         break;
 492 #endif
 493
 494                 case SSL3_ST_CW_FINISHED_A:
 495                 case SSL3_ST_CW_FINISHED_B:
 496                         ret=ssl3_send_finished(s,
 497                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 498                                 s->method->ssl3_enc->client_finished_label,
 499                                 s->method->ssl3_enc->client_finished_label_len);
 500                         if (ret <= 0) goto end;
 501                         s->state=SSL3_ST_CW_FLUSH;
 502
 503                         /* clear flags */
 504                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 505                         if (s->hit)
 506                                 {
 507                                 s->s3->tmp.next_state=SSL_ST_OK;
 508                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 509                                         {
 510                                         s->state=SSL_ST_OK;
 511                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 512                                         s->s3->delay_buf_pop_ret=0;
 513                                         }
 514                                 }
 515                         else
 516                                 {
 517 #ifndef OPENSSL_NO_TLSEXT
 518                                 /* Allow NewSessionTicket if ticket expected */
 519                                 if (s->tlsext_ticket_expected)
 520                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 521                                 else
 522 #endif
 523
 524                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 525                                 }
 526                         s->init_num=0;
 527                         break;
 528
 529 #ifndef OPENSSL_NO_TLSEXT
 530                 case SSL3_ST_CR_SESSION_TICKET_A:
 531                 case SSL3_ST_CR_SESSION_TICKET_B:
 532                         ret=ssl3_get_new_session_ticket(s);
 533                         if (ret <= 0) goto end;
 534                         s->state=SSL3_ST_CR_FINISHED_A;
 535                         s->init_num=0;
 536                 break;
 537
 538                 case SSL3_ST_CR_CERT_STATUS_A:
 539                 case SSL3_ST_CR_CERT_STATUS_B:
 540                         ret=ssl3_get_cert_status(s);
 541                         if (ret <= 0) goto end;
 542                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 543                         s->init_num=0;
 544                 break;
 545 #endif
 546
 547                 case SSL3_ST_CR_FINISHED_A:
 548                 case SSL3_ST_CR_FINISHED_B:
 549                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 550                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 551                                 SSL3_ST_CR_FINISHED_B);
 552                         if (ret <= 0) goto end;
 553
 554                         if (s->hit)
 555                                 s->state=SSL3_ST_CW_CHANGE_A;
 556                         else
 557                                 s->state=SSL_ST_OK;
 558                         s->init_num=0;
 559                         break;
 560
 561                 case SSL3_ST_CW_FLUSH:
 562                         s->rwstate=SSL_WRITING;
 563                         if (BIO_flush(s->wbio) <= 0)
 564                                 {
 565                                 ret= -1;
 566                                 goto end;
 567                                 }
 568                         s->rwstate=SSL_NOTHING;
 569                         s->state=s->s3->tmp.next_state;
 570                         break;
 571
 572                 case SSL_ST_OK:
 573                         /* clean a few things up */
 574                         ssl3_cleanup_key_block(s);
 575
 576                         if (s->init_buf != NULL)
 577                                 {
 578                                 BUF_MEM_free(s->init_buf);
 579                                 s->init_buf=NULL;
 580                                 }
 581
 582                         /* If we are not 'joining' the last two packets,
 583                          * remove the buffering now */
 584                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 585                                 ssl_free_wbio_buffer(s);
 586                         /* else do it later in ssl3_write */
 587
 588                         s->init_num=0;
 589                         s->renegotiate=0;
 590                         s->new_session=0;
 591
 592                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 593                         if (s->hit) s->ctx->stats.sess_hit++;
 594
 595                         ret=1;
 596                         /* s->server=0; */
 597                         s->handshake_func=ssl3_connect;
 598                         s->ctx->stats.sess_connect_good++;
 599
 600                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 601
 602                         goto end;
 603                         /* break; */
 604
 605                 default:
 606                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 607                         ret= -1;
 608                         goto end;
 609                         /* break; */
 610                         }
 611
 612                 /* did we do anything */
 613                 if (!s->s3->tmp.reuse_message && !skip)
 614                         {
 615                         if (s->debug)
 616                                 {
 617                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 618                                         goto end;
 619                                 }
 620
 621                         if ((cb != NULL) && (s->state != state))
 622                                 {
 623                                 new_state=s->state;
 624                                 s->state=state;
 625                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 626                                 s->state=new_state;
 627                                 }
 628                         }
 629                 skip=0;
 630                 }
 631 end:
 632         s->in_handshake--;
 633         if (buf != NULL)
 634                 BUF_MEM_free(buf);
 635         if (cb != NULL)
 636                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 637         return(ret);
 638         }
 639
 640
 641 int ssl3_client_hello(SSL *s)
 642         {
 643         unsigned char *buf;
 644         unsigned char *p,*d;
 645         int i;
 646         unsigned long l;
 647         int al = 0;
 648 #ifndef OPENSSL_NO_COMP
 649         int j;
 650         SSL_COMP *comp;
 651 #endif
 652
 653         buf=(unsigned char *)s->init_buf->data;
 654         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 655                 {
 656                 SSL_SESSION *sess = s->session;
 657                 if ((sess == NULL) ||
 658                         (sess->ssl_version != s->version) ||
 659                         !sess->session_id_length ||
 660                         (sess->not_resumable))
 661                         {
 662                         if (!ssl_get_new_session(s,0))
 663                                 goto err;
 664                         }
 665                 if (s->method->version == DTLS_ANY_VERSION)
 666                         {
 667                         /* Determine which DTLS version to use */
 668                         int options = s->options;
 669                         /* If DTLS 1.2 disabled correct the version number */
 670                         if (options & SSL_OP_NO_DTLSv1_2)
 671                                 {
 672                                 if (tls1_suiteb(s))
 673                                         {
 674                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 675                                         goto err;
 676                                         }
 677                                 /* Disabling all versions is silly: return an
 678                                  * error.
 679                                  */
 680                                 if (options & SSL_OP_NO_DTLSv1)
 681                                         {
 682                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 683                                         goto err;
 684                                         }
 685                                 /* Update method so we don't use any DTLS 1.2
 686                                  * features.
 687                                  */
 688                                 s->method = DTLSv1_client_method();
 689                                 s->version = DTLS1_VERSION;
 690                                 }
 691                         else
 692                                 {
 693                                 /* We only support one version: update method */
 694                                 if (options & SSL_OP_NO_DTLSv1)
 695                                         s->method = DTLSv1_2_client_method();
 696                                 s->version = DTLS1_2_VERSION;
 697                                 }
 698                         s->client_version = s->version;
 699                         }
 700                 /* else use the pre-loaded session */
 701
 702                 p=s->s3->client_random;
 703
 704                 /* for DTLS if client_random is initialized, reuse it, we are
 705                  * required to use same upon reply to HelloVerify */
 706                 if (SSL_IS_DTLS(s))
 707                         {
 708                         size_t idx;
 709                         i = 1;
 710                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 711                                 {
 712                                 if (p[idx])
 713                                         {
 714                                         i = 0;
 715                                         break;
 716                                         }
 717                                 }
 718                         }
 719                 else
 720                         i = 1;
 721
 722                 if (i)
 723                         ssl_fill_hello_random(s, 0, p,
 724                                               sizeof(s->s3->client_random));
 725
 726                 /* Do the message type and length last */
 727                 d=p= ssl_handshake_start(s);
 728
 729                 /* version indicates the negotiated version: for example from
 730                  * an SSLv2/v3 compatible client hello). The client_version
 731                  * field is the maximum version we permit and it is also
 732                  * used in RSA encrypted premaster secrets. Some servers can
 733                  * choke if we initially report a higher version then
 734                  * renegotiate to a lower one in the premaster secret. This
 735                  * didn't happen with TLS 1.0 as most servers supported it
 736                  * but it can with TLS 1.1 or later if the server only supports
 737                  * 1.0.
 738                  *
 739                  * Possible scenario with previous logic:
 740                  *      1. Client hello indicates TLS 1.2
 741                  *      2. Server hello says TLS 1.0
 742                  *      3. RSA encrypted premaster secret uses 1.2.
 743                  *      4. Handhaked proceeds using TLS 1.0.
 744                  *      5. Server sends hello request to renegotiate.
 745                  *      6. Client hello indicates TLS v1.0 as we now
 746                  *         know that is maximum server supports.
 747                  *      7. Server chokes on RSA encrypted premaster secret
 748                  *         containing version 1.0.
 749                  *
 750                  * For interoperability it should be OK to always use the
 751                  * maximum version we support in client hello and then rely
 752                  * on the checking of version to ensure the servers isn't
 753                  * being inconsistent: for example initially negotiating with
 754                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 755                  * client_version in client hello and not resetting it to
 756                  * the negotiated version.
 757                  */
 758 #if 0
 759                 *(p++)=s->version>>8;
 760                 *(p++)=s->version&0xff;
 761                 s->client_version=s->version;
 762 #else
 763                 *(p++)=s->client_version>>8;
 764                 *(p++)=s->client_version&0xff;
 765 #endif
 766
 767                 /* Random stuff */
 768                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 769                 p+=SSL3_RANDOM_SIZE;
 770
 771                 /* Session ID */
 772                 if (s->new_session)
 773                         i=0;
 774                 else
 775                         i=s->session->session_id_length;
 776                 *(p++)=i;
 777                 if (i != 0)
 778                         {
 779                         if (i > (int)sizeof(s->session->session_id))
 780                                 {
 781                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 782                                 goto err;
 783                                 }
 784                         memcpy(p,s->session->session_id,i);
 785                         p+=i;
 786                         }
 787
 788                 /* cookie stuff for DTLS */
 789                 if (SSL_IS_DTLS(s))
 790                         {
 791                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 792                                 {
 793                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 794                                 goto err;
 795                                 }
 796                         *(p++) = s->d1->cookie_len;
 797                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 798                         p += s->d1->cookie_len;
 799                         }
 800
 801                 /* Ciphers supported */
 802                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 803                 if (i == 0)
 804                         {
 805                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 806                         goto err;
 807                         }
 808 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 809                         /* Some servers hang if client hello > 256 bytes
 810                          * as hack workaround chop number of supported ciphers
 811                          * to keep it well below this if we use TLS v1.2
 812                          */
 813                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 814                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 815                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 816 #endif
 817                 s2n(i,p);
 818                 p+=i;
 819
 820                 /* COMPRESSION */
 821 #ifdef OPENSSL_NO_COMP
 822                 *(p++)=1;
 823 #else
 824
 825                 if ((s->options & SSL_OP_NO_COMPRESSION)
 826                                         || !s->ctx->comp_methods)
 827                         j=0;
 828                 else
 829                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 830                 *(p++)=1+j;
 831                 for (i=0; i<j; i++)
 832                         {
 833                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 834                         *(p++)=comp->id;
 835                         }
 836 #endif
 837                 *(p++)=0; /* Add the NULL method */
 838
 839 #ifndef OPENSSL_NO_TLSEXT
 840                 /* TLS extensions*/
 841                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 842                         {
 843                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 844                         goto err;
 845                         }
 846                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 847                         {
 848                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 849                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 850                         goto err;
 851                         }
 852 #endif
 853
 854                 l= p-d;
 855                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 856                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 857                 }
 858
 859         /* SSL3_ST_CW_CLNT_HELLO_B */
 860         return ssl_do_write(s);
 861 err:
 862         return(-1);
 863         }
 864
 865 int ssl3_get_server_hello(SSL *s)
 866         {
 867         STACK_OF(SSL_CIPHER) *sk;
 868         const SSL_CIPHER *c;
 869         CERT *ct = s->cert;
 870         unsigned char *p,*d;
 871         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 872         unsigned int j;
 873         long n;
 874 #ifndef OPENSSL_NO_COMP
 875         SSL_COMP *comp;
 876 #endif
 877         /* Hello verify request and/or server hello version may not
 878          * match so set first packet if we're negotiating version.
 879          */
 880         if (SSL_IS_DTLS(s))
 881                 s->first_packet = 1;
 882
 883         n=s->method->ssl_get_message(s,
 884                 SSL3_ST_CR_SRVR_HELLO_A,
 885                 SSL3_ST_CR_SRVR_HELLO_B,
 886                 -1,
 887                 20000, /* ?? */
 888                 &ok);
 889
 890         if (!ok) return((int)n);
 891
 892         if (SSL_IS_DTLS(s))
 893                 {
 894                 s->first_packet = 0;
 895                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 896                         {
 897                         if ( s->d1->send_cookie == 0)
 898                                 {
 899                                 s->s3->tmp.reuse_message = 1;
 900                                 return 1;
 901                                 }
 902                         else /* already sent a cookie */
 903                                 {
 904                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 905                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 906                                 goto f_err;
 907                                 }
 908                         }
 909                 }
 910
 911         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 912                 {
 913                 al=SSL_AD_UNEXPECTED_MESSAGE;
 914                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 915                 goto f_err;
 916                 }
 917
 918         d=p=(unsigned char *)s->init_msg;
 919         if (s->method->version == DTLS_ANY_VERSION)
 920                 {
 921                 /* Work out correct protocol version to use */
 922                 int hversion = (p[0] << 8)|p[1];
 923                 int options = s->options;
 924                 if (hversion == DTLS1_2_VERSION
 925                         && !(options & SSL_OP_NO_DTLSv1_2))
 926                         s->method = DTLSv1_2_client_method();
 927                 else if (tls1_suiteb(s))
 928                         {
 929                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 930                         s->version = hversion;
 931                         al = SSL_AD_PROTOCOL_VERSION;
 932                         goto f_err;
 933                         }
 934                 else if (hversion == DTLS1_VERSION
 935                         && !(options & SSL_OP_NO_DTLSv1))
 936                         s->method = DTLSv1_client_method();
 937                 else
 938                         {
 939                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 940                         s->version = hversion;
 941                         al = SSL_AD_PROTOCOL_VERSION;
 942                         goto f_err;
 943                         }
 944                 s->version = s->method->version;
 945                 }
 946
 947         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 948                 {
 949                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 950                 s->version=(s->version&0xff00)|p[1];
 951                 al=SSL_AD_PROTOCOL_VERSION;
 952                 goto f_err;
 953                 }
 954         p+=2;
 955
 956         /* load the server hello data */
 957         /* load the server random */
 958         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 959         p+=SSL3_RANDOM_SIZE;
 960
 961         s->hit = 0;
 962
 963         /* get the session-id */
 964         j= *(p++);
 965
 966         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 967                 {
 968                 al=SSL_AD_ILLEGAL_PARAMETER;
 969                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 970                 goto f_err;
 971                 }
 972
 973 #ifndef OPENSSL_NO_TLSEXT
 974         /* check if we want to resume the session based on external pre-shared secret */
 975         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 976                 {
 977                 SSL_CIPHER *pref_cipher=NULL;
 978                 s->session->master_key_length=sizeof(s->session->master_key);
 979                 if (s->tls_session_secret_cb(s, s->session->master_key,
 980                                              &s->session->master_key_length,
 981                                              NULL, &pref_cipher,
 982                                              s->tls_session_secret_cb_arg))
 983                         {
 984                         s->session->cipher = pref_cipher ?
 985                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 986                         s->hit = 1;
 987                         }
 988                 }
 989 #endif /* OPENSSL_NO_TLSEXT */
 990
 991         if (!s->hit && j != 0 && j == s->session->session_id_length
 992             && memcmp(p,s->session->session_id,j) == 0)
 993             {
 994             if(s->sid_ctx_length != s->session->sid_ctx_length
 995                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 996                 {
 997                 /* actually a client application bug */
 998                 al=SSL_AD_ILLEGAL_PARAMETER;
 999                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1000                 goto f_err;
1001                 }
1002             s->hit=1;
1003             }
1004         /* a miss or crap from the other end */
1005         if (!s->hit)
1006                 {
1007                 /* If we were trying for session-id reuse, make a new
1008                  * SSL_SESSION so we don't stuff up other people */
1009                 if (s->session->session_id_length > 0)
1010                         {
1011                         if (!ssl_get_new_session(s,0))
1012                                 {
1013                                 goto f_err;
1014                                 }
1015                         }
1016                 s->session->session_id_length=j;
1017                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1018                 }
1019         p+=j;
1020         c=ssl_get_cipher_by_char(s,p);
1021         if (c == NULL)
1022                 {
1023                 /* unknown cipher */
1024                 al=SSL_AD_ILLEGAL_PARAMETER;
1025                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1026                 goto f_err;
1027                 }
1028         /* If it is a disabled cipher we didn't send it in client hello,
1029          * so return an error.
1030          */
1031         if (c->algorithm_ssl & ct->mask_ssl ||
1032                 c->algorithm_mkey & ct->mask_k ||
1033                 c->algorithm_auth & ct->mask_a)
1034                 {
1035                 al=SSL_AD_ILLEGAL_PARAMETER;
1036                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1037                 goto f_err;
1038                 }
1039         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1040
1041         sk=ssl_get_ciphers_by_id(s);
1042         i=sk_SSL_CIPHER_find(sk,c);
1043         if (i < 0)
1044                 {
1045                 /* we did not say we would use this cipher */
1046                 al=SSL_AD_ILLEGAL_PARAMETER;
1047                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1048                 goto f_err;
1049                 }
1050
1051         /* Depending on the session caching (internal/external), the cipher
1052            and/or cipher_id values may not be set. Make sure that
1053            cipher_id is set and use it for comparison. */
1054         if (s->session->cipher)
1055                 s->session->cipher_id = s->session->cipher->id;
1056         if (s->hit && (s->session->cipher_id != c->id))
1057                 {
1058 /* Workaround is now obsolete */
1059 #if 0
1060                 if (!(s->options &
1061                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1062 #endif
1063                         {
1064                         al=SSL_AD_ILLEGAL_PARAMETER;
1065                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1066                         goto f_err;
1067                         }
1068                 }
1069         s->s3->tmp.new_cipher=c;
1070         /* Don't digest cached records if no sigalgs: we may need them for
1071          * client authentication.
1072          */
1073         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1074                 goto f_err;
1075         /* lets get the compression algorithm */
1076         /* COMPRESSION */
1077 #ifdef OPENSSL_NO_COMP
1078         if (*(p++) != 0)
1079                 {
1080                 al=SSL_AD_ILLEGAL_PARAMETER;
1081                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1082                 goto f_err;
1083                 }
1084         /* If compression is disabled we'd better not try to resume a session
1085          * using compression.
1086          */
1087         if (s->session->compress_meth != 0)
1088                 {
1089                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1090                 goto f_err;
1091                 }
1092 #else
1093         j= *(p++);
1094         if (s->hit && j != s->session->compress_meth)
1095                 {
1096                 al=SSL_AD_ILLEGAL_PARAMETER;
1097                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1098                 goto f_err;
1099                 }
1100         if (j == 0)
1101                 comp=NULL;
1102         else if (s->options & SSL_OP_NO_COMPRESSION)
1103                 {
1104                 al=SSL_AD_ILLEGAL_PARAMETER;
1105                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1106                 goto f_err;
1107                 }
1108         else
1109                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1110
1111         if ((j != 0) && (comp == NULL))
1112                 {
1113                 al=SSL_AD_ILLEGAL_PARAMETER;
1114                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1115                 goto f_err;
1116                 }
1117         else
1118                 {
1119                 s->s3->tmp.new_compression=comp;
1120                 }
1121 #endif
1122
1123 #ifndef OPENSSL_NO_TLSEXT
1124         /* TLS extensions*/
1125         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1126                 {
1127                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1128                 goto err;
1129                 }
1130 #endif
1131
1132         if (p != (d+n))
1133                 {
1134                 /* wrong packet length */
1135                 al=SSL_AD_DECODE_ERROR;
1136                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1137                 goto f_err;
1138                 }
1139
1140         return(1);
1141 f_err:
1142         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1143 err:
1144         return(-1);
1145         }
1146
1147 int ssl3_get_server_certificate(SSL *s)
1148         {
1149         int al,i,ok,ret= -1;
1150         unsigned long n,nc,llen,l;
1151         X509 *x=NULL;
1152         const unsigned char *q,*p;
1153         unsigned char *d;
1154         STACK_OF(X509) *sk=NULL;
1155         SESS_CERT *sc;
1156         EVP_PKEY *pkey=NULL;
1157         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1158
1159         n=s->method->ssl_get_message(s,
1160                 SSL3_ST_CR_CERT_A,
1161                 SSL3_ST_CR_CERT_B,
1162                 -1,
1163                 s->max_cert_list,
1164                 &ok);
1165
1166         if (!ok) return((int)n);
1167
1168         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1169                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1170                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1171                 {
1172                 s->s3->tmp.reuse_message=1;
1173                 return(1);
1174                 }
1175
1176         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1177                 {
1178                 al=SSL_AD_UNEXPECTED_MESSAGE;
1179                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1180                 goto f_err;
1181                 }
1182         p=d=(unsigned char *)s->init_msg;
1183
1184         if ((sk=sk_X509_new_null()) == NULL)
1185                 {
1186                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1187                 goto err;
1188                 }
1189
1190         n2l3(p,llen);
1191         if (llen+3 != n)
1192                 {
1193                 al=SSL_AD_DECODE_ERROR;
1194                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1195                 goto f_err;
1196                 }
1197         for (nc=0; nc<llen; )
1198                 {
1199                 n2l3(p,l);
1200                 if ((l+nc+3) > llen)
1201                         {
1202                         al=SSL_AD_DECODE_ERROR;
1203                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1204                         goto f_err;
1205                         }
1206
1207                 q=p;
1208                 x=d2i_X509(NULL,&q,l);
1209                 if (x == NULL)
1210                         {
1211                         al=SSL_AD_BAD_CERTIFICATE;
1212                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1213                         goto f_err;
1214                         }
1215                 if (q != (p+l))
1216                         {
1217                         al=SSL_AD_DECODE_ERROR;
1218                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1219                         goto f_err;
1220                         }
1221                 if (!sk_X509_push(sk,x))
1222                         {
1223                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1224                         goto err;
1225                         }
1226                 x=NULL;
1227                 nc+=l+3;
1228                 p=q;
1229                 }
1230
1231         i=ssl_verify_cert_chain(s,sk);
1232         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1233 #ifndef OPENSSL_NO_KRB5
1234             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1235                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1236 #endif /* OPENSSL_NO_KRB5 */
1237                 )
1238                 {
1239                 al=ssl_verify_alarm_type(s->verify_result);
1240                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1241                 goto f_err;
1242                 }
1243         ERR_clear_error(); /* but we keep s->verify_result */
1244
1245         sc=ssl_sess_cert_new();
1246         if (sc == NULL) goto err;
1247
1248         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1249         s->session->sess_cert=sc;
1250
1251         sc->cert_chain=sk;
1252         /* Inconsistency alert: cert_chain does include the peer's
1253          * certificate, which we don't include in s3_srvr.c */
1254         x=sk_X509_value(sk,0);
1255         sk=NULL;
1256         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1257
1258         pkey=X509_get_pubkey(x);
1259
1260         /* VRS: allow null cert if auth == KRB5 */
1261         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1262                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1263                     ? 0 : 1;
1264
1265 #ifdef KSSL_DEBUG
1266         fprintf(stderr,"pkey,x = %p, %p\n", pkey,x);
1267         fprintf(stderr,"ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1268         fprintf(stderr,"cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1269                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1270 #endif    /* KSSL_DEBUG */
1271
1272         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1273                 {
1274                 x=NULL;
1275                 al=SSL3_AL_FATAL;
1276                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1277                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1278                 goto f_err;
1279                 }
1280
1281         i=ssl_cert_type(x,pkey);
1282         if (need_cert && i < 0)
1283                 {
1284                 x=NULL;
1285                 al=SSL3_AL_FATAL;
1286                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1287                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1288                 goto f_err;
1289                 }
1290
1291         if (need_cert)
1292                 {
1293                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1294                 if (exp_idx >= 0 && i != exp_idx)
1295                         {
1296                         x=NULL;
1297                         al=SSL_AD_ILLEGAL_PARAMETER;
1298                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1299                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1300                         goto f_err;
1301                         }
1302                 sc->peer_cert_type=i;
1303                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1304                 /* Why would the following ever happen?
1305                  * We just created sc a couple of lines ago. */
1306                 if (sc->peer_pkeys[i].x509 != NULL)
1307                         X509_free(sc->peer_pkeys[i].x509);
1308                 sc->peer_pkeys[i].x509=x;
1309                 sc->peer_key= &(sc->peer_pkeys[i]);
1310
1311                 if (s->session->peer != NULL)
1312                         X509_free(s->session->peer);
1313                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1314                 s->session->peer=x;
1315                 }
1316         else
1317                 {
1318                 sc->peer_cert_type=i;
1319                 sc->peer_key= NULL;
1320
1321                 if (s->session->peer != NULL)
1322                         X509_free(s->session->peer);
1323                 s->session->peer=NULL;
1324                 }
1325         s->session->verify_result = s->verify_result;
1326
1327         x=NULL;
1328         ret=1;
1329         if (0)
1330                 {
1331 f_err:
1332                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1333                 }
1334 err:
1335         EVP_PKEY_free(pkey);
1336         X509_free(x);
1337         sk_X509_pop_free(sk,X509_free);
1338         return(ret);
1339         }
1340
1341 int ssl3_get_key_exchange(SSL *s)
1342         {
1343 #ifndef OPENSSL_NO_RSA
1344         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1345 #endif
1346         EVP_MD_CTX md_ctx;
1347         unsigned char *param,*p;
1348         int al,j,ok;
1349         long i,param_len,n,alg_k,alg_a;
1350         EVP_PKEY *pkey=NULL;
1351         const EVP_MD *md = NULL;
1352 #ifndef OPENSSL_NO_RSA
1353         RSA *rsa=NULL;
1354 #endif
1355 #ifndef OPENSSL_NO_DH
1356         DH *dh=NULL;
1357 #endif
1358 #ifndef OPENSSL_NO_ECDH
1359         EC_KEY *ecdh = NULL;
1360         BN_CTX *bn_ctx = NULL;
1361         EC_POINT *srvr_ecpoint = NULL;
1362         int curve_nid = 0;
1363         int encoded_pt_len = 0;
1364 #endif
1365
1366         EVP_MD_CTX_init(&md_ctx);
1367
1368         /* use same message size as in ssl3_get_certificate_request()
1369          * as ServerKeyExchange message may be skipped */
1370         n=s->method->ssl_get_message(s,
1371                 SSL3_ST_CR_KEY_EXCH_A,
1372                 SSL3_ST_CR_KEY_EXCH_B,
1373                 -1,
1374                 s->max_cert_list,
1375                 &ok);
1376         if (!ok) return((int)n);
1377
1378         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1379
1380         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1381                 {
1382                 /*
1383                  * Can't skip server key exchange if this is an ephemeral
1384                  * ciphersuite.
1385                  */
1386                 if (alg_k & (SSL_kDHE|SSL_kECDHE))
1387                         {
1388                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1389                         al = SSL_AD_UNEXPECTED_MESSAGE;
1390                         goto f_err;
1391                         }
1392 #ifndef OPENSSL_NO_PSK
1393                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1394                    omitted if no identity hint is sent. Set
1395                    session->sess_cert anyway to avoid problems
1396                    later.*/
1397                 if (alg_k & SSL_kPSK)
1398                         {
1399                         s->session->sess_cert=ssl_sess_cert_new();
1400                         if (s->ctx->psk_identity_hint)
1401                                 OPENSSL_free(s->ctx->psk_identity_hint);
1402                         s->ctx->psk_identity_hint = NULL;
1403                         }
1404 #endif
1405                 s->s3->tmp.reuse_message=1;
1406                 return(1);
1407                 }
1408
1409         param=p=(unsigned char *)s->init_msg;
1410         if (s->session->sess_cert != NULL)
1411                 {
1412 #ifndef OPENSSL_NO_RSA
1413                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1414                         {
1415                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1416                         s->session->sess_cert->peer_rsa_tmp=NULL;
1417                         }
1418 #endif
1419 #ifndef OPENSSL_NO_DH
1420                 if (s->session->sess_cert->peer_dh_tmp)
1421                         {
1422                         DH_free(s->session->sess_cert->peer_dh_tmp);
1423                         s->session->sess_cert->peer_dh_tmp=NULL;
1424                         }
1425 #endif
1426 #ifndef OPENSSL_NO_ECDH
1427                 if (s->session->sess_cert->peer_ecdh_tmp)
1428                         {
1429                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1430                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1431                         }
1432 #endif
1433                 }
1434         else
1435                 {
1436                 s->session->sess_cert=ssl_sess_cert_new();
1437                 }
1438
1439         /* Total length of the parameters including the length prefix */
1440         param_len=0;
1441
1442         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1443
1444         al=SSL_AD_DECODE_ERROR;
1445
1446 #ifndef OPENSSL_NO_PSK
1447         if (alg_k & SSL_kPSK)
1448                 {
1449                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1450
1451                 param_len = 2;
1452                 if (param_len > n)
1453                         {
1454                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1455                                 SSL_R_LENGTH_TOO_SHORT);
1456                         goto f_err;
1457                         }
1458                 n2s(p,i);
1459
1460                 /* Store PSK identity hint for later use, hint is used
1461                  * in ssl3_send_client_key_exchange.  Assume that the
1462                  * maximum length of a PSK identity hint can be as
1463                  * long as the maximum length of a PSK identity. */
1464                 if (i > PSK_MAX_IDENTITY_LEN)
1465                         {
1466                         al=SSL_AD_HANDSHAKE_FAILURE;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1468                                 SSL_R_DATA_LENGTH_TOO_LONG);
1469                         goto f_err;
1470                         }
1471                 if (i > n - param_len)
1472                         {
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1474                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1475                         goto f_err;
1476                         }
1477                 param_len += i;
1478
1479                 /* If received PSK identity hint contains NULL
1480                  * characters, the hint is truncated from the first
1481                  * NULL. p may not be ending with NULL, so create a
1482                  * NULL-terminated string. */
1483                 memcpy(tmp_id_hint, p, i);
1484                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1485                 if (s->ctx->psk_identity_hint != NULL)
1486                         OPENSSL_free(s->ctx->psk_identity_hint);
1487                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1488                 if (s->ctx->psk_identity_hint == NULL)
1489                         {
1490                         al=SSL_AD_HANDSHAKE_FAILURE;
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1492                         goto f_err;
1493                         }
1494
1495                 p+=i;
1496                 n-=param_len;
1497                 }
1498         else
1499 #endif /* !OPENSSL_NO_PSK */
1500 #ifndef OPENSSL_NO_SRP
1501         if (alg_k & SSL_kSRP)
1502                 {
1503                 param_len = 2;
1504                 if (param_len > n)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1507                                 SSL_R_LENGTH_TOO_SHORT);
1508                         goto f_err;
1509                         }
1510                 n2s(p,i);
1511
1512                 if (i > n - param_len)
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1515                         goto f_err;
1516                         }
1517                 param_len += i;
1518
1519                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1522                         goto err;
1523                         }
1524                 p+=i;
1525
1526
1527                 if (2 > n - param_len)
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1530                                 SSL_R_LENGTH_TOO_SHORT);
1531                         goto f_err;
1532                         }
1533                 param_len += 2;
1534
1535                 n2s(p,i);
1536
1537                 if (i > n - param_len)
1538                         {
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1540                         goto f_err;
1541                         }
1542                 param_len += i;
1543
1544                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1547                         goto err;
1548                         }
1549                 p+=i;
1550
1551
1552                 if (1 > n - param_len)
1553                         {
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1555                                 SSL_R_LENGTH_TOO_SHORT);
1556                         goto f_err;
1557                         }
1558                 param_len += 1;
1559
1560                 i = (unsigned int)(p[0]);
1561                 p++;
1562
1563                 if (i > n - param_len)
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1566                         goto f_err;
1567                         }
1568                 param_len += i;
1569
1570                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1573                         goto err;
1574                         }
1575                 p+=i;
1576
1577                 if (2 > n - param_len)
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1580                                 SSL_R_LENGTH_TOO_SHORT);
1581                         goto f_err;
1582                         }
1583                 param_len += 2;
1584
1585                 n2s(p,i);
1586
1587                 if (i > n - param_len)
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1590                         goto f_err;
1591                         }
1592                 param_len += i;
1593
1594                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1597                         goto err;
1598                         }
1599                 p+=i;
1600                 n-=param_len;
1601
1602                 if (!srp_verify_server_param(s, &al))
1603                         {
1604                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1605                         goto f_err;
1606                         }
1607
1608 /* We must check if there is a certificate */
1609 #ifndef OPENSSL_NO_RSA
1610                 if (alg_a & SSL_aRSA)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1612 #else
1613                 if (0)
1614                         ;
1615 #endif
1616 #ifndef OPENSSL_NO_DSA
1617                 else if (alg_a & SSL_aDSS)
1618                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1619 #endif
1620                 }
1621         else
1622 #endif /* !OPENSSL_NO_SRP */
1623 #ifndef OPENSSL_NO_RSA
1624         if (alg_k & SSL_kRSA)
1625                 {
1626                 if ((rsa=RSA_new()) == NULL)
1627                         {
1628                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1629                         goto err;
1630                         }
1631
1632                 param_len = 2;
1633                 if (param_len > n)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1636                                 SSL_R_LENGTH_TOO_SHORT);
1637                         goto f_err;
1638                         }
1639                 n2s(p,i);
1640
1641                 if (i > n - param_len)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1644                         goto f_err;
1645                         }
1646                 param_len += i;
1647
1648                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1651                         goto err;
1652                         }
1653                 p+=i;
1654
1655                 if (2 > n - param_len)
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1658                                 SSL_R_LENGTH_TOO_SHORT);
1659                         goto f_err;
1660                         }
1661                 param_len += 2;
1662
1663                 n2s(p,i);
1664
1665                 if (i > n - param_len)
1666                         {
1667                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1668                         goto f_err;
1669                         }
1670                 param_len += i;
1671
1672                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1675                         goto err;
1676                         }
1677                 p+=i;
1678                 n-=param_len;
1679
1680                 /* this should be because we are using an export cipher */
1681                 if (alg_a & SSL_aRSA)
1682                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1683                 else
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1686                         goto err;
1687                         }
1688                 s->session->sess_cert->peer_rsa_tmp=rsa;
1689                 rsa=NULL;
1690                 }
1691 #else /* OPENSSL_NO_RSA */
1692         if (0)
1693                 ;
1694 #endif
1695 #ifndef OPENSSL_NO_DH
1696         else if (alg_k & SSL_kEDH)
1697                 {
1698                 if ((dh=DH_new()) == NULL)
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1701                         goto err;
1702                         }
1703
1704                 param_len = 2;
1705                 if (param_len > n)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1708                                 SSL_R_LENGTH_TOO_SHORT);
1709                         goto f_err;
1710                         }
1711                 n2s(p,i);
1712
1713                 if (i > n - param_len)
1714                         {
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1716                         goto f_err;
1717                         }
1718                 param_len += i;
1719
1720                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1723                         goto err;
1724                         }
1725                 p+=i;
1726
1727                 if (2 > n - param_len)
1728                         {
1729                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1730                                 SSL_R_LENGTH_TOO_SHORT);
1731                         goto f_err;
1732                         }
1733                 param_len += 2;
1734
1735                 n2s(p,i);
1736
1737                 if (i > n - param_len)
1738                         {
1739                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1740                         goto f_err;
1741                         }
1742                 param_len += i;
1743
1744                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1745                         {
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1747                         goto err;
1748                         }
1749                 p+=i;
1750
1751                 if (2 > n - param_len)
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1754                                 SSL_R_LENGTH_TOO_SHORT);
1755                         goto f_err;
1756                         }
1757                 param_len += 2;
1758
1759                 n2s(p,i);
1760
1761                 if (i > n - param_len)
1762                         {
1763                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1764                         goto f_err;
1765                         }
1766                 param_len += i;
1767
1768                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1771                         goto err;
1772                         }
1773                 p+=i;
1774                 n-=param_len;
1775
1776 #ifndef OPENSSL_NO_RSA
1777                 if (alg_a & SSL_aRSA)
1778                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1779 #else
1780                 if (0)
1781                         ;
1782 #endif
1783 #ifndef OPENSSL_NO_DSA
1784                 else if (alg_a & SSL_aDSS)
1785                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1786 #endif
1787                 /* else anonymous DH, so no certificate or pkey. */
1788
1789                 s->session->sess_cert->peer_dh_tmp=dh;
1790                 dh=NULL;
1791                 }
1792         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1793                 {
1794                 al=SSL_AD_ILLEGAL_PARAMETER;
1795                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1796                 goto f_err;
1797                 }
1798 #endif /* !OPENSSL_NO_DH */
1799
1800 #ifndef OPENSSL_NO_ECDH
1801         else if (alg_k & SSL_kEECDH)
1802                 {
1803                 EC_GROUP *ngroup;
1804                 const EC_GROUP *group;
1805
1806                 if ((ecdh=EC_KEY_new()) == NULL)
1807                         {
1808                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1809                         goto err;
1810                         }
1811
1812                 /* Extract elliptic curve parameters and the
1813                  * server's ephemeral ECDH public key.
1814                  * Keep accumulating lengths of various components in
1815                  * param_len and make sure it never exceeds n.
1816                  */
1817
1818                 /* XXX: For now we only support named (not generic) curves
1819                  * and the ECParameters in this case is just three bytes. We
1820                  * also need one byte for the length of the encoded point
1821                  */
1822                 param_len=4;
1823                 if (param_len > n)
1824                         {
1825                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1826                                 SSL_R_LENGTH_TOO_SHORT);
1827                         goto f_err;
1828                         }
1829                 /* Check curve is one of our preferences, if not server has
1830                  * sent an invalid curve. ECParameters is 3 bytes.
1831                  */
1832                 if (!tls1_check_curve(s, p, 3))
1833                         {
1834                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1835                         goto f_err;
1836                         }
1837
1838                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1839                         {
1840                         al=SSL_AD_INTERNAL_ERROR;
1841                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1842                         goto f_err;
1843                         }
1844
1845                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1846                 if (ngroup == NULL)
1847                         {
1848                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1849                         goto err;
1850                         }
1851                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1852                         {
1853                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1854                         goto err;
1855                         }
1856                 EC_GROUP_free(ngroup);
1857
1858                 group = EC_KEY_get0_group(ecdh);
1859
1860                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1861                     (EC_GROUP_get_degree(group) > 163))
1862                         {
1863                         al=SSL_AD_EXPORT_RESTRICTION;
1864                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1865                         goto f_err;
1866                         }
1867
1868                 p+=3;
1869
1870                 /* Next, get the encoded ECPoint */
1871                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1872                     ((bn_ctx = BN_CTX_new()) == NULL))
1873                         {
1874                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1875                         goto err;
1876                         }
1877
1878                 encoded_pt_len = *p;  /* length of encoded point */
1879                 p+=1;
1880
1881                 if ((encoded_pt_len > n - param_len) ||
1882                     (EC_POINT_oct2point(group, srvr_ecpoint,
1883                         p, encoded_pt_len, bn_ctx) == 0))
1884                         {
1885                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1886                         goto f_err;
1887                         }
1888                 param_len += encoded_pt_len;
1889
1890                 n-=param_len;
1891                 p+=encoded_pt_len;
1892
1893                 /* The ECC/TLS specification does not mention
1894                  * the use of DSA to sign ECParameters in the server
1895                  * key exchange message. We do support RSA and ECDSA.
1896                  */
1897                 if (0) ;
1898 #ifndef OPENSSL_NO_RSA
1899                 else if (alg_a & SSL_aRSA)
1900                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1901 #endif
1902 #ifndef OPENSSL_NO_ECDSA
1903                 else if (alg_a & SSL_aECDSA)
1904                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1905 #endif
1906                 /* else anonymous ECDH, so no certificate or pkey. */
1907                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1908                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1909                 ecdh=NULL;
1910                 BN_CTX_free(bn_ctx);
1911                 bn_ctx = NULL;
1912                 EC_POINT_free(srvr_ecpoint);
1913                 srvr_ecpoint = NULL;
1914                 }
1915         else if (alg_k)
1916                 {
1917                 al=SSL_AD_UNEXPECTED_MESSAGE;
1918                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1919                 goto f_err;
1920                 }
1921 #endif /* !OPENSSL_NO_ECDH */
1922
1923
1924         /* p points to the next byte, there are 'n' bytes left */
1925
1926         /* if it was signed, check the signature */
1927         if (pkey != NULL)
1928                 {
1929                 if (SSL_USE_SIGALGS(s))
1930                         {
1931                         int rv;
1932                         if (2 > n)
1933                                 {
1934                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1935                                         SSL_R_LENGTH_TOO_SHORT);
1936                                 goto f_err;
1937                                 }
1938                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1939                         if (rv == -1)
1940                                 goto err;
1941                         else if (rv == 0)
1942                                 {
1943                                 goto f_err;
1944                                 }
1945 #ifdef SSL_DEBUG
1946 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1947 #endif
1948                         p += 2;
1949                         n -= 2;
1950                         }
1951                 else
1952                         md = EVP_sha1();
1953
1954                 if (2 > n)
1955                         {
1956                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1957                                 SSL_R_LENGTH_TOO_SHORT);
1958                         goto f_err;
1959                         }
1960                 n2s(p,i);
1961                 n-=2;
1962                 j=EVP_PKEY_size(pkey);
1963
1964                 /* Check signature length. If n is 0 then signature is empty */
1965                 if ((i != n) || (n > j) || (n <= 0))
1966                         {
1967                         /* wrong packet length */
1968                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1969                         goto f_err;
1970                         }
1971
1972 #ifndef OPENSSL_NO_RSA
1973                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1974                         {
1975                         int num;
1976                         unsigned int size;
1977
1978                         j=0;
1979                         q=md_buf;
1980                         for (num=2; num > 0; num--)
1981                                 {
1982                                 EVP_MD_CTX_set_flags(&md_ctx,
1983                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1984                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1985                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1986                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1987                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1988                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1989                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1990                                 q+=size;
1991                                 j+=size;
1992                                 }
1993                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1994                                                                 pkey->pkey.rsa);
1995                         if (i < 0)
1996                                 {
1997                                 al=SSL_AD_DECRYPT_ERROR;
1998                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1999                                 goto f_err;
2000                                 }
2001                         if (i == 0)
2002                                 {
2003                                 /* bad signature */
2004                                 al=SSL_AD_DECRYPT_ERROR;
2005                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2006                                 goto f_err;
2007                                 }
2008                         }
2009                 else
2010 #endif
2011                         {
2012                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2013                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2014                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2015                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2016                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2017                                 {
2018                                 /* bad signature */
2019                                 al=SSL_AD_DECRYPT_ERROR;
2020                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2021                                 goto f_err;
2022                                 }
2023                         }
2024                 }
2025         else
2026                 {
2027                 /* aNULL, aSRP or kPSK do not need public keys */
2028                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2029                         {
2030                         /* Might be wrong key type, check it */
2031                         if (ssl3_check_cert_and_algorithm(s))
2032                                 /* Otherwise this shouldn't happen */
2033                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2034                         goto err;
2035                         }
2036                 /* still data left over */
2037                 if (n != 0)
2038                         {
2039                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2040                         goto f_err;
2041                         }
2042                 }
2043         EVP_PKEY_free(pkey);
2044         EVP_MD_CTX_cleanup(&md_ctx);
2045         return(1);
2046 f_err:
2047         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2048 err:
2049         EVP_PKEY_free(pkey);
2050 #ifndef OPENSSL_NO_RSA
2051         if (rsa != NULL)
2052                 RSA_free(rsa);
2053 #endif
2054 #ifndef OPENSSL_NO_DH
2055         if (dh != NULL)
2056                 DH_free(dh);
2057 #endif
2058 #ifndef OPENSSL_NO_ECDH
2059         BN_CTX_free(bn_ctx);
2060         EC_POINT_free(srvr_ecpoint);
2061         if (ecdh != NULL)
2062                 EC_KEY_free(ecdh);
2063 #endif
2064         EVP_MD_CTX_cleanup(&md_ctx);
2065         return(-1);
2066         }
2067
2068 int ssl3_get_certificate_request(SSL *s)
2069         {
2070         int ok,ret=0;
2071         unsigned long n,nc,l;
2072         unsigned int llen, ctype_num,i;
2073         X509_NAME *xn=NULL;
2074         const unsigned char *p,*q;
2075         unsigned char *d;
2076         STACK_OF(X509_NAME) *ca_sk=NULL;
2077
2078         n=s->method->ssl_get_message(s,
2079                 SSL3_ST_CR_CERT_REQ_A,
2080                 SSL3_ST_CR_CERT_REQ_B,
2081                 -1,
2082                 s->max_cert_list,
2083                 &ok);
2084
2085         if (!ok) return((int)n);
2086
2087         s->s3->tmp.cert_req=0;
2088
2089         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2090                 {
2091                 s->s3->tmp.reuse_message=1;
2092                 /* If we get here we don't need any cached handshake records
2093                  * as we wont be doing client auth.
2094                  */
2095                 if (s->s3->handshake_buffer)
2096                         {
2097                         if (!ssl3_digest_cached_records(s))
2098                                 goto err;
2099                         }
2100                 return(1);
2101                 }
2102
2103         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2104                 {
2105                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2106                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2107                 goto err;
2108                 }
2109
2110         /* TLS does not like anon-DH with client cert */
2111         if (s->version > SSL3_VERSION)
2112                 {
2113                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2114                         {
2115                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2116                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2117                         goto err;
2118                         }
2119                 }
2120
2121         p=d=(unsigned char *)s->init_msg;
2122
2123         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2124                 {
2125                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2126                 goto err;
2127                 }
2128
2129         /* get the certificate types */
2130         ctype_num= *(p++);
2131         if (s->cert->ctypes)
2132                 {
2133                 OPENSSL_free(s->cert->ctypes);
2134                 s->cert->ctypes = NULL;
2135                 }
2136         if (ctype_num > SSL3_CT_NUMBER)
2137                 {
2138                 /* If we exceed static buffer copy all to cert structure */
2139                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2140                 memcpy(s->cert->ctypes, p, ctype_num);
2141                 s->cert->ctype_num = (size_t)ctype_num;
2142                 ctype_num=SSL3_CT_NUMBER;
2143                 }
2144         for (i=0; i<ctype_num; i++)
2145                 s->s3->tmp.ctype[i]= p[i];
2146         p+=p[-1];
2147         if (SSL_USE_SIGALGS(s))
2148                 {
2149                 n2s(p, llen);
2150                 /* Check we have enough room for signature algorithms and
2151                  * following length value.
2152                  */
2153                 if ((unsigned long)(p - d + llen + 2) > n)
2154                         {
2155                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2156                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2157                         goto err;
2158                         }
2159                 /* Clear certificate digests and validity flags */
2160                 for (i = 0; i < SSL_PKEY_NUM; i++)
2161                         {
2162                         s->cert->pkeys[i].digest = NULL;
2163                         s->cert->pkeys[i].valid_flags = 0;
2164                         }
2165                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2166                         {
2167                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2168                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2169                         goto err;
2170                         }
2171                 if (!tls1_process_sigalgs(s))
2172                         {
2173                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2174                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2175                         goto err;
2176                         }
2177                 p += llen;
2178                 }
2179
2180         /* get the CA RDNs */
2181         n2s(p,llen);
2182 #if 0
2183 {
2184 FILE *out;
2185 out=fopen("/tmp/vsign.der","w");
2186 fwrite(p,1,llen,out);
2187 fclose(out);
2188 }
2189 #endif
2190
2191         if ((unsigned long)(p - d + llen) != n)
2192                 {
2193                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2194                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2195                 goto err;
2196                 }
2197
2198         for (nc=0; nc<llen; )
2199                 {
2200                 n2s(p,l);
2201                 if ((l+nc+2) > llen)
2202                         {
2203                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2204                                 goto cont; /* netscape bugs */
2205                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2206                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2207                         goto err;
2208                         }
2209
2210                 q=p;
2211
2212                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2213                         {
2214                         /* If netscape tolerance is on, ignore errors */
2215                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2216                                 goto cont;
2217                         else
2218                                 {
2219                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2220                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2221                                 goto err;
2222                                 }
2223                         }
2224
2225                 if (q != (p+l))
2226                         {
2227                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2228                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2229                         goto err;
2230                         }
2231                 if (!sk_X509_NAME_push(ca_sk,xn))
2232                         {
2233                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2234                         goto err;
2235                         }
2236
2237                 p+=l;
2238                 nc+=l+2;
2239                 }
2240
2241         if (0)
2242                 {
2243 cont:
2244                 ERR_clear_error();
2245                 }
2246
2247         /* we should setup a certificate to return.... */
2248         s->s3->tmp.cert_req=1;
2249         s->s3->tmp.ctype_num=ctype_num;
2250         if (s->s3->tmp.ca_names != NULL)
2251                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2252         s->s3->tmp.ca_names=ca_sk;
2253         ca_sk=NULL;
2254
2255         ret=1;
2256 err:
2257         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2258         return(ret);
2259         }
2260
2261 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2262         {
2263         return(X509_NAME_cmp(*a,*b));
2264         }
2265 #ifndef OPENSSL_NO_TLSEXT
2266 int ssl3_get_new_session_ticket(SSL *s)
2267         {
2268         int ok,al,ret=0, ticklen;
2269         long n;
2270         const unsigned char *p;
2271         unsigned char *d;
2272
2273         n=s->method->ssl_get_message(s,
2274                 SSL3_ST_CR_SESSION_TICKET_A,
2275                 SSL3_ST_CR_SESSION_TICKET_B,
2276                 SSL3_MT_NEWSESSION_TICKET,
2277                 16384,
2278                 &ok);
2279
2280         if (!ok)
2281                 return((int)n);
2282
2283         if (n < 6)
2284                 {
2285                 /* need at least ticket_lifetime_hint + ticket length */
2286                 al = SSL_AD_DECODE_ERROR;
2287                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2288                 goto f_err;
2289                 }
2290
2291         p=d=(unsigned char *)s->init_msg;
2292         n2l(p, s->session->tlsext_tick_lifetime_hint);
2293         n2s(p, ticklen);
2294         /* ticket_lifetime_hint + ticket_length + ticket */
2295         if (ticklen + 6 != n)
2296                 {
2297                 al = SSL_AD_DECODE_ERROR;
2298                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2299                 goto f_err;
2300                 }
2301         if (s->session->tlsext_tick)
2302                 {
2303                 OPENSSL_free(s->session->tlsext_tick);
2304                 s->session->tlsext_ticklen = 0;
2305                 }
2306         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2307         if (!s->session->tlsext_tick)
2308                 {
2309                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2310                 goto err;
2311                 }
2312         memcpy(s->session->tlsext_tick, p, ticklen);
2313         s->session->tlsext_ticklen = ticklen;
2314         /* There are two ways to detect a resumed ticket session.
2315          * One is to set an appropriate session ID and then the server
2316          * must return a match in ServerHello. This allows the normal
2317          * client session ID matching to work and we know much
2318          * earlier that the ticket has been accepted.
2319          *
2320          * The other way is to set zero length session ID when the
2321          * ticket is presented and rely on the handshake to determine
2322          * session resumption.
2323          *
2324          * We choose the former approach because this fits in with
2325          * assumptions elsewhere in OpenSSL. The session ID is set
2326          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2327          * ticket.
2328          */
2329         EVP_Digest(p, ticklen,
2330                         s->session->session_id, &s->session->session_id_length,
2331 #ifndef OPENSSL_NO_SHA256
2332                                                         EVP_sha256(), NULL);
2333 #else
2334                                                         EVP_sha1(), NULL);
2335 #endif
2336         ret=1;
2337         return(ret);
2338 f_err:
2339         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2340 err:
2341         return(-1);
2342         }
2343
2344 int ssl3_get_cert_status(SSL *s)
2345         {
2346         int ok, al;
2347         unsigned long resplen,n;
2348         const unsigned char *p;
2349
2350         n=s->method->ssl_get_message(s,
2351                 SSL3_ST_CR_CERT_STATUS_A,
2352                 SSL3_ST_CR_CERT_STATUS_B,
2353                 SSL3_MT_CERTIFICATE_STATUS,
2354                 16384,
2355                 &ok);
2356
2357         if (!ok) return((int)n);
2358         if (n < 4)
2359                 {
2360                 /* need at least status type + length */
2361                 al = SSL_AD_DECODE_ERROR;
2362                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2363                 goto f_err;
2364                 }
2365         p = (unsigned char *)s->init_msg;
2366         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2367                 {
2368                 al = SSL_AD_DECODE_ERROR;
2369                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2370                 goto f_err;
2371                 }
2372         n2l3(p, resplen);
2373         if (resplen + 4 != n)
2374                 {
2375                 al = SSL_AD_DECODE_ERROR;
2376                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2377                 goto f_err;
2378                 }
2379         if (s->tlsext_ocsp_resp)
2380                 OPENSSL_free(s->tlsext_ocsp_resp);
2381         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2382         if (!s->tlsext_ocsp_resp)
2383                 {
2384                 al = SSL_AD_INTERNAL_ERROR;
2385                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2386                 goto f_err;
2387                 }
2388         s->tlsext_ocsp_resplen = resplen;
2389         if (s->ctx->tlsext_status_cb)
2390                 {
2391                 int ret;
2392                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2393                 if (ret == 0)
2394                         {
2395                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2396                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2397                         goto f_err;
2398                         }
2399                 if (ret < 0)
2400                         {
2401                         al = SSL_AD_INTERNAL_ERROR;
2402                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2403                         goto f_err;
2404                         }
2405                 }
2406         return 1;
2407 f_err:
2408         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2409         return(-1);
2410         }
2411 #endif
2412
2413 int ssl3_get_server_done(SSL *s)
2414         {
2415         int ok,ret=0;
2416         long n;
2417
2418         n=s->method->ssl_get_message(s,
2419                 SSL3_ST_CR_SRVR_DONE_A,
2420                 SSL3_ST_CR_SRVR_DONE_B,
2421                 SSL3_MT_SERVER_DONE,
2422                 30, /* should be very small, like 0 :-) */
2423                 &ok);
2424
2425         if (!ok) return((int)n);
2426         if (n > 0)
2427                 {
2428                 /* should contain no data */
2429                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2430                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2431                 return -1;
2432                 }
2433         ret=1;
2434         return(ret);
2435         }
2436
2437
2438 int ssl3_send_client_key_exchange(SSL *s)
2439         {
2440         unsigned char *p;
2441         int n;
2442         unsigned long alg_k;
2443 #ifndef OPENSSL_NO_RSA
2444         unsigned char *q;
2445         EVP_PKEY *pkey=NULL;
2446 #endif
2447 #ifndef OPENSSL_NO_KRB5
2448         KSSL_ERR kssl_err;
2449 #endif /* OPENSSL_NO_KRB5 */
2450 #ifndef OPENSSL_NO_ECDH
2451         EC_KEY *clnt_ecdh = NULL;
2452         const EC_POINT *srvr_ecpoint = NULL;
2453         EVP_PKEY *srvr_pub_pkey = NULL;
2454         unsigned char *encodedPoint = NULL;
2455         int encoded_pt_len = 0;
2456         BN_CTX * bn_ctx = NULL;
2457 #endif
2458
2459         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2460                 {
2461                 p = ssl_handshake_start(s);
2462
2463                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2464
2465                 /* Fool emacs indentation */
2466                 if (0) {}
2467 #ifndef OPENSSL_NO_RSA
2468                 else if (alg_k & SSL_kRSA)
2469                         {
2470                         RSA *rsa;
2471                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2472
2473                         if (s->session->sess_cert == NULL)
2474                                 {
2475                                 /* We should always have a server certificate with SSL_kRSA. */
2476                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2477                                 goto err;
2478                                 }
2479
2480                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2481                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2482                         else
2483                                 {
2484                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2485                                 if ((pkey == NULL) ||
2486                                         (pkey->type != EVP_PKEY_RSA) ||
2487                                         (pkey->pkey.rsa == NULL))
2488                                         {
2489                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2490                                         goto err;
2491                                         }
2492                                 rsa=pkey->pkey.rsa;
2493                                 EVP_PKEY_free(pkey);
2494                                 }
2495
2496                         tmp_buf[0]=s->client_version>>8;
2497                         tmp_buf[1]=s->client_version&0xff;
2498                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2499                                         goto err;
2500
2501                         s->session->master_key_length=sizeof tmp_buf;
2502
2503                         q=p;
2504                         /* Fix buf for TLS and beyond */
2505                         if (s->version > SSL3_VERSION)
2506                                 p+=2;
2507                         n=RSA_public_encrypt(sizeof tmp_buf,
2508                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2509 #ifdef PKCS1_CHECK
2510                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2511                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2512 #endif
2513                         if (n <= 0)
2514                                 {
2515                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2516                                 goto err;
2517                                 }
2518
2519                         /* Fix buf for TLS and beyond */
2520                         if (s->version > SSL3_VERSION)
2521                                 {
2522                                 s2n(n,q);
2523                                 n+=2;
2524                                 }
2525
2526                         s->session->master_key_length=
2527                                 s->method->ssl3_enc->generate_master_secret(s,
2528                                         s->session->master_key,
2529                                         tmp_buf,sizeof tmp_buf);
2530                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2531                         }
2532 #endif
2533 #ifndef OPENSSL_NO_KRB5
2534                 else if (alg_k & SSL_kKRB5)
2535                         {
2536                         krb5_error_code krb5rc;
2537                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2538                         /*  krb5_data   krb5_ap_req;  */
2539                         krb5_data       *enc_ticket;
2540                         krb5_data       authenticator, *authp = NULL;
2541                         EVP_CIPHER_CTX  ciph_ctx;
2542                         const EVP_CIPHER *enc = NULL;
2543                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2544                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2545                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2546                                                 + EVP_MAX_IV_LENGTH];
2547                         int             padl, outl = sizeof(epms);
2548
2549                         EVP_CIPHER_CTX_init(&ciph_ctx);
2550
2551 #ifdef KSSL_DEBUG
2552                         fprintf(stderr,"ssl3_send_client_key_exchange(%lx & %lx)\n",
2553                                 alg_k, SSL_kKRB5);
2554 #endif  /* KSSL_DEBUG */
2555
2556                         authp = NULL;
2557 #ifdef KRB5SENDAUTH
2558                         if (KRB5SENDAUTH)  authp = &authenticator;
2559 #endif  /* KRB5SENDAUTH */
2560
2561                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2562                                 &kssl_err);
2563                         enc = kssl_map_enc(kssl_ctx->enctype);
2564                         if (enc == NULL)
2565                             goto err;
2566 #ifdef KSSL_DEBUG
2567                         {
2568                         fprintf(stderr,"kssl_cget_tkt rtn %d\n", krb5rc);
2569                         if (krb5rc && kssl_err.text)
2570                           fprintf(stderr,"kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2571                         }
2572 #endif  /* KSSL_DEBUG */
2573
2574                         if (krb5rc)
2575                                 {
2576                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2577                                                 SSL_AD_HANDSHAKE_FAILURE);
2578                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2579                                                 kssl_err.reason);
2580                                 goto err;
2581                                 }
2582
2583                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2584                         **  in place of RFC 2712 KerberosWrapper, as in:
2585                         **
2586                         **  Send ticket (copy to *p, set n = length)
2587                         **  n = krb5_ap_req.length;
2588                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2589                         **  if (krb5_ap_req.data)
2590                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2591                         **
2592                         **  Now using real RFC 2712 KerberosWrapper
2593                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2594                         **  Note: 2712 "opaque" types are here replaced
2595                         **  with a 2-byte length followed by the value.
2596                         **  Example:
2597                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2598                         **  Where "xx xx" = length bytes.  Shown here with
2599                         **  optional authenticator omitted.
2600                         */
2601
2602                         /*  KerberosWrapper.Ticket              */
2603                         s2n(enc_ticket->length,p);
2604                         memcpy(p, enc_ticket->data, enc_ticket->length);
2605                         p+= enc_ticket->length;
2606                         n = enc_ticket->length + 2;
2607
2608                         /*  KerberosWrapper.Authenticator       */
2609                         if (authp  &&  authp->length)
2610                                 {
2611                                 s2n(authp->length,p);
2612                                 memcpy(p, authp->data, authp->length);
2613                                 p+= authp->length;
2614                                 n+= authp->length + 2;
2615
2616                                 free(authp->data);
2617                                 authp->data = NULL;
2618                                 authp->length = 0;
2619                                 }
2620                         else
2621                                 {
2622                                 s2n(0,p);/*  null authenticator length  */
2623                                 n+=2;
2624                                 }
2625
2626                             tmp_buf[0]=s->client_version>>8;
2627                             tmp_buf[1]=s->client_version&0xff;
2628                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2629                                 goto err;
2630
2631                         /*  20010420 VRS.  Tried it this way; failed.
2632                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2633                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2634                         **                              kssl_ctx->length);
2635                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2636                         */
2637
2638                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2639                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2640                                 kssl_ctx->key,iv);
2641                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2642                                 sizeof tmp_buf);
2643                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2644                         outl += padl;
2645                         if (outl > (int)sizeof epms)
2646                                 {
2647                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2648                                 goto err;
2649                                 }
2650                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2651
2652                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2653                         s2n(outl,p);
2654                         memcpy(p, epms, outl);
2655                         p+=outl;
2656                         n+=outl + 2;
2657
2658                         s->session->master_key_length=
2659                                 s->method->ssl3_enc->generate_master_secret(s,
2660                                         s->session->master_key,
2661                                         tmp_buf, sizeof tmp_buf);
2662
2663                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2664                         OPENSSL_cleanse(epms, outl);
2665                         }
2666 #endif
2667 #ifndef OPENSSL_NO_DH
2668                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2669                         {
2670                         DH *dh_srvr,*dh_clnt;
2671                         SESS_CERT *scert = s->session->sess_cert;
2672
2673                         if (scert == NULL)
2674                                 {
2675                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2676                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2677                                 goto err;
2678                                 }
2679
2680                         if (scert->peer_dh_tmp != NULL)
2681                                 dh_srvr=scert->peer_dh_tmp;
2682                         else
2683                                 {
2684                                 /* we get them from the cert */
2685                                 int idx = scert->peer_cert_type;
2686                                 EVP_PKEY *spkey = NULL;
2687                                 dh_srvr = NULL;
2688                                 if (idx >= 0)
2689                                         spkey = X509_get_pubkey(
2690                                                 scert->peer_pkeys[idx].x509);
2691                                 if (spkey)
2692                                         {
2693                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2694                                         EVP_PKEY_free(spkey);
2695                                         }
2696                                 if (dh_srvr == NULL)
2697                                         {
2698                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2699                                             ERR_R_INTERNAL_ERROR);
2700                                         goto err;
2701                                         }
2702                                 }
2703                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2704                                 {
2705                                 /* Use client certificate key */
2706                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2707                                 dh_clnt = NULL;
2708                                 if (clkey)
2709                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2710                                 if (dh_clnt == NULL)
2711                                         {
2712                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2713                                             ERR_R_INTERNAL_ERROR);
2714                                         goto err;
2715                                         }
2716                                 }
2717                         else
2718                                 {
2719                                 /* generate a new random key */
2720                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2721                                         {
2722                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2723                                         goto err;
2724                                         }
2725                                 if (!DH_generate_key(dh_clnt))
2726                                         {
2727                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2728                                         DH_free(dh_clnt);
2729                                         goto err;
2730                                         }
2731                                 }
2732
2733                         /* use the 'p' output buffer for the DH key, but
2734                          * make sure to clear it out afterwards */
2735
2736                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2737                         if (scert->peer_dh_tmp == NULL)
2738                                 DH_free(dh_srvr);
2739
2740                         if (n <= 0)
2741                                 {
2742                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2743                                 DH_free(dh_clnt);
2744                                 goto err;
2745                                 }
2746
2747                         /* generate master key from the result */
2748                         s->session->master_key_length=
2749                                 s->method->ssl3_enc->generate_master_secret(s,
2750                                         s->session->master_key,p,n);
2751                         /* clean up */
2752                         memset(p,0,n);
2753
2754                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2755                                 n = 0;
2756                         else
2757                                 {
2758                                 /* send off the data */
2759                                 n=BN_num_bytes(dh_clnt->pub_key);
2760                                 s2n(n,p);
2761                                 BN_bn2bin(dh_clnt->pub_key,p);
2762                                 n+=2;
2763                                 }
2764
2765                         DH_free(dh_clnt);
2766
2767                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2768                         }
2769 #endif
2770
2771 #ifndef OPENSSL_NO_ECDH
2772                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2773                         {
2774                         const EC_GROUP *srvr_group = NULL;
2775                         EC_KEY *tkey;
2776                         int ecdh_clnt_cert = 0;
2777                         int field_size = 0;
2778
2779                         if (s->session->sess_cert == NULL)
2780                                 {
2781                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2782                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2783                                 goto err;
2784                                 }
2785
2786                         /* Did we send out the client's
2787                          * ECDH share for use in premaster
2788                          * computation as part of client certificate?
2789                          * If so, set ecdh_clnt_cert to 1.
2790                          */
2791                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2792                                 {
2793                                 /* XXX: For now, we do not support client
2794                                  * authentication using ECDH certificates.
2795                                  * To add such support, one needs to add
2796                                  * code that checks for appropriate
2797                                  * conditions and sets ecdh_clnt_cert to 1.
2798                                  * For example, the cert have an ECC
2799                                  * key on the same curve as the server's
2800                                  * and the key should be authorized for
2801                                  * key agreement.
2802                                  *
2803                                  * One also needs to add code in ssl3_connect
2804                                  * to skip sending the certificate verify
2805                                  * message.
2806                                  *
2807                                  * if ((s->cert->key->privatekey != NULL) &&
2808                                  *     (s->cert->key->privatekey->type ==
2809                                  *      EVP_PKEY_EC) && ...)
2810                                  * ecdh_clnt_cert = 1;
2811                                  */
2812                                 }
2813
2814                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2815                                 {
2816                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2817                                 }
2818                         else
2819                                 {
2820                                 /* Get the Server Public Key from Cert */
2821                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2822                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2823                                 if ((srvr_pub_pkey == NULL) ||
2824                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2825                                     (srvr_pub_pkey->pkey.ec == NULL))
2826                                         {
2827                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2828                                             ERR_R_INTERNAL_ERROR);
2829                                         goto err;
2830                                         }
2831
2832                                 tkey = srvr_pub_pkey->pkey.ec;
2833                                 }
2834
2835                         srvr_group   = EC_KEY_get0_group(tkey);
2836                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2837
2838                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2841                                     ERR_R_INTERNAL_ERROR);
2842                                 goto err;
2843                                 }
2844
2845                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2846                                 {
2847                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2848                                 goto err;
2849                                 }
2850
2851                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2852                                 {
2853                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2854                                 goto err;
2855                                 }
2856                         if (ecdh_clnt_cert)
2857                                 {
2858                                 /* Reuse key info from our certificate
2859                                  * We only need our private key to perform
2860                                  * the ECDH computation.
2861                                  */
2862                                 const BIGNUM *priv_key;
2863                                 tkey = s->cert->key->privatekey->pkey.ec;
2864                                 priv_key = EC_KEY_get0_private_key(tkey);
2865                                 if (priv_key == NULL)
2866                                         {
2867                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2868                                         goto err;
2869                                         }
2870                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2871                                         {
2872                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2873                                         goto err;
2874                                         }
2875                                 }
2876                         else
2877                                 {
2878                                 /* Generate a new ECDH key pair */
2879                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2880                                         {
2881                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2882                                         goto err;
2883                                         }
2884                                 }
2885
2886                         /* use the 'p' output buffer for the ECDH key, but
2887                          * make sure to clear it out afterwards
2888                          */
2889
2890                         field_size = EC_GROUP_get_degree(srvr_group);
2891                         if (field_size <= 0)
2892                                 {
2893                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2894                                        ERR_R_ECDH_LIB);
2895                                 goto err;
2896                                 }
2897                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2898                         if (n <= 0)
2899                                 {
2900                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2901                                        ERR_R_ECDH_LIB);
2902                                 goto err;
2903                                 }
2904
2905                         /* generate master key from the result */
2906                         s->session->master_key_length = s->method->ssl3_enc \
2907                             -> generate_master_secret(s,
2908                                 s->session->master_key,
2909                                 p, n);
2910
2911                         memset(p, 0, n); /* clean up */
2912
2913                         if (ecdh_clnt_cert)
2914                                 {
2915                                 /* Send empty client key exch message */
2916                                 n = 0;
2917                                 }
2918                         else
2919                                 {
2920                                 /* First check the size of encoding and
2921                                  * allocate memory accordingly.
2922                                  */
2923                                 encoded_pt_len =
2924                                     EC_POINT_point2oct(srvr_group,
2925                                         EC_KEY_get0_public_key(clnt_ecdh),
2926                                         POINT_CONVERSION_UNCOMPRESSED,
2927                                         NULL, 0, NULL);
2928
2929                                 encodedPoint = (unsigned char *)
2930                                     OPENSSL_malloc(encoded_pt_len *
2931                                         sizeof(unsigned char));
2932                                 bn_ctx = BN_CTX_new();
2933                                 if ((encodedPoint == NULL) ||
2934                                     (bn_ctx == NULL))
2935                                         {
2936                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2937                                         goto err;
2938                                         }
2939
2940                                 /* Encode the public key */
2941                                 n = EC_POINT_point2oct(srvr_group,
2942                                     EC_KEY_get0_public_key(clnt_ecdh),
2943                                     POINT_CONVERSION_UNCOMPRESSED,
2944                                     encodedPoint, encoded_pt_len, bn_ctx);
2945
2946                                 *p = n; /* length of encoded point */
2947                                 /* Encoded point will be copied here */
2948                                 p += 1;
2949                                 /* copy the point */
2950                                 memcpy((unsigned char *)p, encodedPoint, n);
2951                                 /* increment n to account for length field */
2952                                 n += 1;
2953                                 }
2954
2955                         /* Free allocated memory */
2956                         BN_CTX_free(bn_ctx);
2957                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2958                         if (clnt_ecdh != NULL)
2959                                  EC_KEY_free(clnt_ecdh);
2960                         EVP_PKEY_free(srvr_pub_pkey);
2961                         }
2962 #endif /* !OPENSSL_NO_ECDH */
2963                 else if (alg_k & SSL_kGOST)
2964                         {
2965                         /* GOST key exchange message creation */
2966                         EVP_PKEY_CTX *pkey_ctx;
2967                         X509 *peer_cert;
2968                         size_t msglen;
2969                         unsigned int md_len;
2970                         int keytype;
2971                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2972                         EVP_MD_CTX *ukm_hash;
2973                         EVP_PKEY *pub_key;
2974
2975                         /* Get server sertificate PKEY and create ctx from it */
2976                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2977                         if (!peer_cert)
2978                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2979                         if (!peer_cert)         {
2980                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2981                                         goto err;
2982                                 }
2983
2984                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2985                         /* If we have send a certificate, and certificate key
2986
2987                          * parameters match those of server certificate, use
2988                          * certificate key for key exchange
2989                          */
2990
2991                          /* Otherwise, generate ephemeral key pair */
2992
2993                         EVP_PKEY_encrypt_init(pkey_ctx);
2994                           /* Generate session key */
2995                     RAND_bytes(premaster_secret,32);
2996                         /* If we have client certificate, use its secret as peer key */
2997                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2998                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2999                                         /* If there was an error - just ignore it. Ephemeral key
3000                                         * would be used
3001                                         */
3002                                         ERR_clear_error();
3003                                 }
3004                         }
3005                         /* Compute shared IV and store it in algorithm-specific
3006                          * context data */
3007                         ukm_hash = EVP_MD_CTX_create();
3008                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3009                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3010                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3011                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3012                         EVP_MD_CTX_destroy(ukm_hash);
3013                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3014                                 8,shared_ukm)<0) {
3015                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3016                                                 SSL_R_LIBRARY_BUG);
3017                                         goto err;
3018                                 }
3019                         /* Make GOST keytransport blob message */
3020                         /*Encapsulate it into sequence */
3021                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3022                         msglen=255;
3023                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3024                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3025                                         SSL_R_LIBRARY_BUG);
3026                                 goto err;
3027                         }
3028                         if (msglen >= 0x80)
3029                                 {
3030                                 *(p++)=0x81;
3031                                 *(p++)= msglen & 0xff;
3032                                 n=msglen+3;
3033                                 }
3034                         else
3035                                 {
3036                                 *(p++)= msglen & 0xff;
3037                                 n=msglen+2;
3038                                 }
3039                         memcpy(p, tmp, msglen);
3040                         /* Check if pubkey from client certificate was used */
3041                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3042                                 {
3043                                 /* Set flag "skip certificate verify" */
3044                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3045                                 }
3046                         EVP_PKEY_CTX_free(pkey_ctx);
3047                         s->session->master_key_length=
3048                                 s->method->ssl3_enc->generate_master_secret(s,
3049                                         s->session->master_key,premaster_secret,32);
3050                         EVP_PKEY_free(pub_key);
3051
3052                         }
3053 #ifndef OPENSSL_NO_SRP
3054                 else if (alg_k & SSL_kSRP)
3055                         {
3056                         if (s->srp_ctx.A != NULL)
3057                                 {
3058                                 /* send off the data */
3059                                 n=BN_num_bytes(s->srp_ctx.A);
3060                                 s2n(n,p);
3061                                 BN_bn2bin(s->srp_ctx.A,p);
3062                                 n+=2;
3063                                 }
3064                         else
3065                                 {
3066                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3067                                 goto err;
3068                                 }
3069                         if (s->session->srp_username != NULL)
3070                                 OPENSSL_free(s->session->srp_username);
3071                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3072                         if (s->session->srp_username == NULL)
3073                                 {
3074                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3075                                         ERR_R_MALLOC_FAILURE);
3076                                 goto err;
3077                                 }
3078
3079                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3080                                 {
3081                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3082                                 goto err;
3083                                 }
3084                         }
3085 #endif
3086 #ifndef OPENSSL_NO_PSK
3087                 else if (alg_k & SSL_kPSK)
3088                         {
3089                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3090                          * to return a \0-terminated identity. The last byte
3091                          * is for us for simulating strnlen. */
3092                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3093                         size_t identity_len;
3094                         unsigned char *t = NULL;
3095                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3096                         unsigned int pre_ms_len = 0, psk_len = 0;
3097                         int psk_err = 1;
3098
3099                         n = 0;
3100                         if (s->psk_client_callback == NULL)
3101                                 {
3102                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3103                                         SSL_R_PSK_NO_CLIENT_CB);
3104                                 goto err;
3105                                 }
3106
3107                         memset(identity, 0, sizeof(identity));
3108                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3109                                 identity, sizeof(identity) - 1,
3110                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3111                         if (psk_len > PSK_MAX_PSK_LEN)
3112                                 {
3113                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3114                                         ERR_R_INTERNAL_ERROR);
3115                                 goto psk_err;
3116                                 }
3117                         else if (psk_len == 0)
3118                                 {
3119                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3120                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3121                                 goto psk_err;
3122                                 }
3123                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3124                         identity_len = strlen(identity);
3125                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3126                                 {
3127                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3128                                         ERR_R_INTERNAL_ERROR);
3129                                 goto psk_err;
3130                                 }
3131                         /* create PSK pre_master_secret */
3132                         pre_ms_len = 2+psk_len+2+psk_len;
3133                         t = psk_or_pre_ms;
3134                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3135                         s2n(psk_len, t);
3136                         memset(t, 0, psk_len);
3137                         t+=psk_len;
3138                         s2n(psk_len, t);
3139
3140                         if (s->session->psk_identity_hint != NULL)
3141                                 OPENSSL_free(s->session->psk_identity_hint);
3142                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3143                         if (s->ctx->psk_identity_hint != NULL &&
3144                                 s->session->psk_identity_hint == NULL)
3145                                 {
3146                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3147                                         ERR_R_MALLOC_FAILURE);
3148                                 goto psk_err;
3149                                 }
3150
3151                         if (s->session->psk_identity != NULL)
3152                                 OPENSSL_free(s->session->psk_identity);
3153                         s->session->psk_identity = BUF_strdup(identity);
3154                         if (s->session->psk_identity == NULL)
3155                                 {
3156                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3157                                         ERR_R_MALLOC_FAILURE);
3158                                 goto psk_err;
3159                                 }
3160
3161                         s->session->master_key_length =
3162                                 s->method->ssl3_enc->generate_master_secret(s,
3163                                         s->session->master_key,
3164                                         psk_or_pre_ms, pre_ms_len);
3165                         s2n(identity_len, p);
3166                         memcpy(p, identity, identity_len);
3167                         n = 2 + identity_len;
3168                         psk_err = 0;
3169                 psk_err:
3170                         OPENSSL_cleanse(identity, sizeof(identity));
3171                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3172                         if (psk_err != 0)
3173                                 {
3174                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3175                                 goto err;
3176                                 }
3177                         }
3178 #endif
3179                 else
3180                         {
3181                         ssl3_send_alert(s, SSL3_AL_FATAL,
3182                             SSL_AD_HANDSHAKE_FAILURE);
3183                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3184                             ERR_R_INTERNAL_ERROR);
3185                         goto err;
3186                         }
3187
3188                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3189                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3190                 }
3191
3192         /* SSL3_ST_CW_KEY_EXCH_B */
3193         return ssl_do_write(s);
3194 err:
3195 #ifndef OPENSSL_NO_ECDH
3196         BN_CTX_free(bn_ctx);
3197         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3198         if (clnt_ecdh != NULL)
3199                 EC_KEY_free(clnt_ecdh);
3200         EVP_PKEY_free(srvr_pub_pkey);
3201 #endif
3202         return(-1);
3203         }
3204
3205 int ssl3_send_client_verify(SSL *s)
3206         {
3207         unsigned char *p;
3208         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3209         EVP_PKEY *pkey;
3210         EVP_PKEY_CTX *pctx=NULL;
3211         EVP_MD_CTX mctx;
3212         unsigned u=0;
3213         unsigned long n;
3214         int j;
3215
3216         EVP_MD_CTX_init(&mctx);
3217
3218         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3219                 {
3220                 p= ssl_handshake_start(s);
3221                 pkey=s->cert->key->privatekey;
3222 /* Create context from key and test if sha1 is allowed as digest */
3223                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3224                 EVP_PKEY_sign_init(pctx);
3225                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3226                         {
3227                         if (!SSL_USE_SIGALGS(s))
3228                                 s->method->ssl3_enc->cert_verify_mac(s,
3229                                                 NID_sha1,
3230                                                 &(data[MD5_DIGEST_LENGTH]));
3231                         }
3232                 else
3233                         {
3234                         ERR_clear_error();
3235                         }
3236                 /* For TLS v1.2 send signature algorithm and signature
3237                  * using agreed digest and cached handshake records.
3238                  */
3239                 if (SSL_USE_SIGALGS(s))
3240                         {
3241                         long hdatalen = 0;
3242                         void *hdata;
3243                         const EVP_MD *md = s->cert->key->digest;
3244                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3245                                                                 &hdata);
3246                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3247                                 {
3248                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3249                                                 ERR_R_INTERNAL_ERROR);
3250                                 goto err;
3251                                 }
3252                         p += 2;
3253 #ifdef SSL_DEBUG
3254                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3255                                                         EVP_MD_name(md));
3256 #endif
3257                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3258                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3259                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3260                                 {
3261                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3262                                                 ERR_R_EVP_LIB);
3263                                 goto err;
3264                                 }
3265                         s2n(u,p);
3266                         n = u + 4;
3267                         if (!ssl3_digest_cached_records(s))
3268                                 goto err;
3269                         }
3270                 else
3271 #ifndef OPENSSL_NO_RSA
3272                 if (pkey->type == EVP_PKEY_RSA)
3273                         {
3274                         s->method->ssl3_enc->cert_verify_mac(s,
3275                                 NID_md5,
3276                                 &(data[0]));
3277                         if (RSA_sign(NID_md5_sha1, data,
3278                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3279                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3280                                 {
3281                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3282                                 goto err;
3283                                 }
3284                         s2n(u,p);
3285                         n=u+2;
3286                         }
3287                 else
3288 #endif
3289 #ifndef OPENSSL_NO_DSA
3290                         if (pkey->type == EVP_PKEY_DSA)
3291                         {
3292                         if (!DSA_sign(pkey->save_type,
3293                                 &(data[MD5_DIGEST_LENGTH]),
3294                                 SHA_DIGEST_LENGTH,&(p[2]),
3295                                 (unsigned int *)&j,pkey->pkey.dsa))
3296                                 {
3297                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3298                                 goto err;
3299                                 }
3300                         s2n(j,p);
3301                         n=j+2;
3302                         }
3303                 else
3304 #endif
3305 #ifndef OPENSSL_NO_ECDSA
3306                         if (pkey->type == EVP_PKEY_EC)
3307                         {
3308                         if (!ECDSA_sign(pkey->save_type,
3309                                 &(data[MD5_DIGEST_LENGTH]),
3310                                 SHA_DIGEST_LENGTH,&(p[2]),
3311                                 (unsigned int *)&j,pkey->pkey.ec))
3312                                 {
3313                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3314                                     ERR_R_ECDSA_LIB);
3315                                 goto err;
3316                                 }
3317                         s2n(j,p);
3318                         n=j+2;
3319                         }
3320                 else
3321 #endif
3322                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3323                 {
3324                 unsigned char signbuf[64];
3325                 int i;
3326                 size_t sigsize=64;
3327                 s->method->ssl3_enc->cert_verify_mac(s,
3328                         NID_id_GostR3411_94,
3329                         data);
3330                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3331                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3332                         ERR_R_INTERNAL_ERROR);
3333                         goto err;
3334                 }
3335                 for (i=63,j=0; i>=0; j++, i--) {
3336                         p[2+j]=signbuf[i];
3337                 }
3338                 s2n(j,p);
3339                 n=j+2;
3340                 }
3341                 else
3342                 {
3343                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3344                         goto err;
3345                 }
3346                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3347                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3348                 }
3349         EVP_MD_CTX_cleanup(&mctx);
3350         EVP_PKEY_CTX_free(pctx);
3351         return ssl_do_write(s);
3352 err:
3353         EVP_MD_CTX_cleanup(&mctx);
3354         EVP_PKEY_CTX_free(pctx);
3355         return(-1);
3356         }
3357
3358 /* Check a certificate can be used for client authentication. Currently
3359  * check cert exists, if we have a suitable digest for TLS 1.2 if
3360  * static DH client certificates can be used and optionally checks
3361  * suitability for Suite B.
3362  */
3363 static int ssl3_check_client_certificate(SSL *s)
3364         {
3365         unsigned long alg_k;
3366         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3367                 return 0;
3368         /* If no suitable signature algorithm can't use certificate */
3369         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3370                 return 0;
3371         /* If strict mode check suitability of chain before using it.
3372          * This also adjusts suite B digest if necessary.
3373          */
3374         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3375                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3376                 return 0;
3377         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3378         /* See if we can use client certificate for fixed DH */
3379         if (alg_k & (SSL_kDHr|SSL_kDHd))
3380                 {
3381                 SESS_CERT *scert = s->session->sess_cert;
3382                 int i = scert->peer_cert_type;
3383                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3384                 clkey = s->cert->key->privatekey;
3385                 /* If client key not DH assume it can be used */
3386                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3387                         return 1;
3388                 if (i >= 0)
3389                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3390                 if (spkey)
3391                         {
3392                         /* Compare server and client parameters */
3393                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3394                         EVP_PKEY_free(spkey);
3395                         if (i != 1)
3396                                 return 0;
3397                         }
3398                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3399                 }
3400         return 1;
3401         }
3402
3403 int ssl3_send_client_certificate(SSL *s)
3404         {
3405         X509 *x509=NULL;
3406         EVP_PKEY *pkey=NULL;
3407         int i;
3408
3409         if (s->state == SSL3_ST_CW_CERT_A)
3410                 {
3411                 /* Let cert callback update client certificates if required */
3412                 if (s->cert->cert_cb)
3413                         {
3414                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3415                         if (i < 0)
3416                                 {
3417                                 s->rwstate=SSL_X509_LOOKUP;
3418                                 return -1;
3419                                 }
3420                         if (i == 0)
3421                                 {
3422                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3423                                 return 0;
3424                                 }
3425                         s->rwstate=SSL_NOTHING;
3426                         }
3427                 if (ssl3_check_client_certificate(s))
3428                         s->state=SSL3_ST_CW_CERT_C;
3429                 else
3430                         s->state=SSL3_ST_CW_CERT_B;
3431                 }
3432
3433         /* We need to get a client cert */
3434         if (s->state == SSL3_ST_CW_CERT_B)
3435                 {
3436                 /* If we get an error, we need to
3437                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3438                  * We then get retied later */
3439                 i=0;
3440                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3441                 if (i < 0)
3442                         {
3443                         s->rwstate=SSL_X509_LOOKUP;
3444                         return(-1);
3445                         }
3446                 s->rwstate=SSL_NOTHING;
3447                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3448                         {
3449                         s->state=SSL3_ST_CW_CERT_B;
3450                         if (    !SSL_use_certificate(s,x509) ||
3451                                 !SSL_use_PrivateKey(s,pkey))
3452                                 i=0;
3453                         }
3454                 else if (i == 1)
3455                         {
3456                         i=0;
3457                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3458                         }
3459
3460                 if (x509 != NULL) X509_free(x509);
3461                 if (pkey != NULL) EVP_PKEY_free(pkey);
3462                 if (i && !ssl3_check_client_certificate(s))
3463                         i = 0;
3464                 if (i == 0)
3465                         {
3466                         if (s->version == SSL3_VERSION)
3467                                 {
3468                                 s->s3->tmp.cert_req=0;
3469                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3470                                 return(1);
3471                                 }
3472                         else
3473                                 {
3474                                 s->s3->tmp.cert_req=2;
3475                                 }
3476                         }
3477
3478                 /* Ok, we have a cert */
3479                 s->state=SSL3_ST_CW_CERT_C;
3480                 }
3481
3482         if (s->state == SSL3_ST_CW_CERT_C)
3483                 {
3484                 s->state=SSL3_ST_CW_CERT_D;
3485                 if (!ssl3_output_cert_chain(s,
3486                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3487                         {
3488                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3489                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3490                         return 0;
3491                         }
3492                 }
3493         /* SSL3_ST_CW_CERT_D */
3494         return ssl_do_write(s);
3495         }
3496
3497 #define has_bits(i,m)   (((i)&(m)) == (m))
3498
3499 int ssl3_check_cert_and_algorithm(SSL *s)
3500         {
3501         int i,idx;
3502         long alg_k,alg_a;
3503         EVP_PKEY *pkey=NULL;
3504         SESS_CERT *sc;
3505 #ifndef OPENSSL_NO_RSA
3506         RSA *rsa;
3507 #endif
3508 #ifndef OPENSSL_NO_DH
3509         DH *dh;
3510 #endif
3511
3512         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3513         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3514
3515         /* we don't have a certificate */
3516         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3517                 return(1);
3518
3519         sc=s->session->sess_cert;
3520         if (sc == NULL)
3521                 {
3522                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3523                 goto err;
3524                 }
3525
3526 #ifndef OPENSSL_NO_RSA
3527         rsa=s->session->sess_cert->peer_rsa_tmp;
3528 #endif
3529 #ifndef OPENSSL_NO_DH
3530         dh=s->session->sess_cert->peer_dh_tmp;
3531 #endif
3532
3533         /* This is the passed certificate */
3534
3535         idx=sc->peer_cert_type;
3536 #ifndef OPENSSL_NO_ECDH
3537         if (idx == SSL_PKEY_ECC)
3538                 {
3539                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3540                                                                 s) == 0)
3541                         { /* check failed */
3542                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3543                         goto f_err;
3544                         }
3545                 else
3546                         {
3547                         return 1;
3548                         }
3549                 }
3550         else if (alg_a & SSL_aECDSA)
3551                 {
3552                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3553                 goto f_err;
3554                 }
3555         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3556                 {
3557                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3558                 goto f_err;
3559                 }
3560 #endif
3561         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3562         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3563         EVP_PKEY_free(pkey);
3564
3565
3566         /* Check that we have a certificate if we require one */
3567         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3568                 {
3569                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3570                 goto f_err;
3571                 }
3572 #ifndef OPENSSL_NO_DSA
3573         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3574                 {
3575                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3576                 goto f_err;
3577                 }
3578 #endif
3579 #ifndef OPENSSL_NO_RSA
3580         if ((alg_k & SSL_kRSA) &&
3581                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3582                 {
3583                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3584                 goto f_err;
3585                 }
3586 #endif
3587 #ifndef OPENSSL_NO_DH
3588         if ((alg_k & SSL_kEDH) &&
3589                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3590                 {
3591                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3592                 goto f_err;
3593                 }
3594         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3595                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3596                 {
3597                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3598                 goto f_err;
3599                 }
3600 #ifndef OPENSSL_NO_DSA
3601         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3602                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3603                 {
3604                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3605                 goto f_err;
3606                 }
3607 #endif
3608 #endif
3609
3610         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3611                 {
3612 #ifndef OPENSSL_NO_RSA
3613                 if (alg_k & SSL_kRSA)
3614                         {
3615                         if (rsa == NULL
3616                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3617                                 {
3618                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3619                                 goto f_err;
3620                                 }
3621                         }
3622                 else
3623 #endif
3624 #ifndef OPENSSL_NO_DH
3625                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3626                             {
3627                             if (dh == NULL
3628                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3629                                 {
3630                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3631                                 goto f_err;
3632                                 }
3633                         }
3634                 else
3635 #endif
3636                         {
3637                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3638                         goto f_err;
3639                         }
3640                 }
3641         return(1);
3642 f_err:
3643         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3644 err:
3645         return(0);
3646         }
3647
3648 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3649 int ssl3_send_next_proto(SSL *s)
3650         {
3651         unsigned int len, padding_len;
3652         unsigned char *d;
3653
3654         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3655                 {
3656                 len = s->next_proto_negotiated_len;
3657                 padding_len = 32 - ((len + 2) % 32);
3658                 d = (unsigned char *)s->init_buf->data;
3659                 d[4] = len;
3660                 memcpy(d + 5, s->next_proto_negotiated, len);
3661                 d[5 + len] = padding_len;
3662                 memset(d + 6 + len, 0, padding_len);
3663                 *(d++)=SSL3_MT_NEXT_PROTO;
3664                 l2n3(2 + len + padding_len, d);
3665                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3666                 s->init_num = 4 + 2 + len + padding_len;
3667                 s->init_off = 0;
3668                 }
3669
3670         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3671         }
3672 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3673
3674 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3675         {
3676         int i = 0;
3677 #ifndef OPENSSL_NO_ENGINE
3678         if (s->ctx->client_cert_engine)
3679                 {
3680                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3681                                                 SSL_get_client_CA_list(s),
3682                                                 px509, ppkey, NULL, NULL, NULL);
3683                 if (i != 0)
3684                         return i;
3685                 }
3686 #endif
3687         if (s->ctx->client_cert_cb)
3688                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3689         return i;
3690         }