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                 /*-
 730                  * version indicates the negotiated version: for example from
 731                  * an SSLv2/v3 compatible client hello). The client_version
 732                  * field is the maximum version we permit and it is also
 733                  * used in RSA encrypted premaster secrets. Some servers can
 734                  * choke if we initially report a higher version then
 735                  * renegotiate to a lower one in the premaster secret. This
 736                  * didn't happen with TLS 1.0 as most servers supported it
 737                  * but it can with TLS 1.1 or later if the server only supports
 738                  * 1.0.
 739                  *
 740                  * Possible scenario with previous logic:
 741                  *      1. Client hello indicates TLS 1.2
 742                  *      2. Server hello says TLS 1.0
 743                  *      3. RSA encrypted premaster secret uses 1.2.
 744                  *      4. Handhaked proceeds using TLS 1.0.
 745                  *      5. Server sends hello request to renegotiate.
 746                  *      6. Client hello indicates TLS v1.0 as we now
 747                  *         know that is maximum server supports.
 748                  *      7. Server chokes on RSA encrypted premaster secret
 749                  *         containing version 1.0.
 750                  *
 751                  * For interoperability it should be OK to always use the
 752                  * maximum version we support in client hello and then rely
 753                  * on the checking of version to ensure the servers isn't
 754                  * being inconsistent: for example initially negotiating with
 755                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 756                  * client_version in client hello and not resetting it to
 757                  * the negotiated version.
 758                  */
 759 #if 0
 760                 *(p++)=s->version>>8;
 761                 *(p++)=s->version&0xff;
 762                 s->client_version=s->version;
 763 #else
 764                 *(p++)=s->client_version>>8;
 765                 *(p++)=s->client_version&0xff;
 766 #endif
 767
 768                 /* Random stuff */
 769                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 770                 p+=SSL3_RANDOM_SIZE;
 771
 772                 /* Session ID */
 773                 if (s->new_session)
 774                         i=0;
 775                 else
 776                         i=s->session->session_id_length;
 777                 *(p++)=i;
 778                 if (i != 0)
 779                         {
 780                         if (i > (int)sizeof(s->session->session_id))
 781                                 {
 782                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 783                                 goto err;
 784                                 }
 785                         memcpy(p,s->session->session_id,i);
 786                         p+=i;
 787                         }
 788
 789                 /* cookie stuff for DTLS */
 790                 if (SSL_IS_DTLS(s))
 791                         {
 792                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 793                                 {
 794                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 795                                 goto err;
 796                                 }
 797                         *(p++) = s->d1->cookie_len;
 798                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 799                         p += s->d1->cookie_len;
 800                         }
 801
 802                 /* Ciphers supported */
 803                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 804                 if (i == 0)
 805                         {
 806                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 807                         goto err;
 808                         }
 809 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 810                         /* Some servers hang if client hello > 256 bytes
 811                          * as hack workaround chop number of supported ciphers
 812                          * to keep it well below this if we use TLS v1.2
 813                          */
 814                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 815                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 816                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 817 #endif
 818                 s2n(i,p);
 819                 p+=i;
 820
 821                 /* COMPRESSION */
 822 #ifdef OPENSSL_NO_COMP
 823                 *(p++)=1;
 824 #else
 825
 826                 if ((s->options & SSL_OP_NO_COMPRESSION)
 827                                         || !s->ctx->comp_methods)
 828                         j=0;
 829                 else
 830                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 831                 *(p++)=1+j;
 832                 for (i=0; i<j; i++)
 833                         {
 834                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 835                         *(p++)=comp->id;
 836                         }
 837 #endif
 838                 *(p++)=0; /* Add the NULL method */
 839
 840 #ifndef OPENSSL_NO_TLSEXT
 841                 /* TLS extensions*/
 842                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 843                         {
 844                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 845                         goto err;
 846                         }
 847                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 848                         {
 849                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 850                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 851                         goto err;
 852                         }
 853 #endif
 854
 855                 l= p-d;
 856                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 857                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 858                 }
 859
 860         /* SSL3_ST_CW_CLNT_HELLO_B */
 861         return ssl_do_write(s);
 862 err:
 863         return(-1);
 864         }
 865
 866 int ssl3_get_server_hello(SSL *s)
 867         {
 868         STACK_OF(SSL_CIPHER) *sk;
 869         const SSL_CIPHER *c;
 870         CERT *ct = s->cert;
 871         unsigned char *p,*d;
 872         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 873         unsigned int j;
 874         long n;
 875 #ifndef OPENSSL_NO_COMP
 876         SSL_COMP *comp;
 877 #endif
 878         /* Hello verify request and/or server hello version may not
 879          * match so set first packet if we're negotiating version.
 880          */
 881         if (SSL_IS_DTLS(s))
 882                 s->first_packet = 1;
 883
 884         n=s->method->ssl_get_message(s,
 885                 SSL3_ST_CR_SRVR_HELLO_A,
 886                 SSL3_ST_CR_SRVR_HELLO_B,
 887                 -1,
 888                 20000, /* ?? */
 889                 &ok);
 890
 891         if (!ok) return((int)n);
 892
 893         if (SSL_IS_DTLS(s))
 894                 {
 895                 s->first_packet = 0;
 896                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 897                         {
 898                         if ( s->d1->send_cookie == 0)
 899                                 {
 900                                 s->s3->tmp.reuse_message = 1;
 901                                 return 1;
 902                                 }
 903                         else /* already sent a cookie */
 904                                 {
 905                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 906                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 907                                 goto f_err;
 908                                 }
 909                         }
 910                 }
 911
 912         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 913                 {
 914                 al=SSL_AD_UNEXPECTED_MESSAGE;
 915                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 916                 goto f_err;
 917                 }
 918
 919         d=p=(unsigned char *)s->init_msg;
 920         if (s->method->version == DTLS_ANY_VERSION)
 921                 {
 922                 /* Work out correct protocol version to use */
 923                 int hversion = (p[0] << 8)|p[1];
 924                 int options = s->options;
 925                 if (hversion == DTLS1_2_VERSION
 926                         && !(options & SSL_OP_NO_DTLSv1_2))
 927                         s->method = DTLSv1_2_client_method();
 928                 else if (tls1_suiteb(s))
 929                         {
 930                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 931                         s->version = hversion;
 932                         al = SSL_AD_PROTOCOL_VERSION;
 933                         goto f_err;
 934                         }
 935                 else if (hversion == DTLS1_VERSION
 936                         && !(options & SSL_OP_NO_DTLSv1))
 937                         s->method = DTLSv1_client_method();
 938                 else
 939                         {
 940                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 941                         s->version = hversion;
 942                         al = SSL_AD_PROTOCOL_VERSION;
 943                         goto f_err;
 944                         }
 945                 s->version = s->method->version;
 946                 }
 947
 948         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 949                 {
 950                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 951                 s->version=(s->version&0xff00)|p[1];
 952                 al=SSL_AD_PROTOCOL_VERSION;
 953                 goto f_err;
 954                 }
 955         p+=2;
 956
 957         /* load the server hello data */
 958         /* load the server random */
 959         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 960         p+=SSL3_RANDOM_SIZE;
 961
 962         s->hit = 0;
 963
 964         /* get the session-id */
 965         j= *(p++);
 966
 967         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 968                 {
 969                 al=SSL_AD_ILLEGAL_PARAMETER;
 970                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 971                 goto f_err;
 972                 }
 973
 974 #ifndef OPENSSL_NO_TLSEXT
 975         /* check if we want to resume the session based on external pre-shared secret */
 976         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 977                 {
 978                 SSL_CIPHER *pref_cipher=NULL;
 979                 s->session->master_key_length=sizeof(s->session->master_key);
 980                 if (s->tls_session_secret_cb(s, s->session->master_key,
 981                                              &s->session->master_key_length,
 982                                              NULL, &pref_cipher,
 983                                              s->tls_session_secret_cb_arg))
 984                         {
 985                         s->session->cipher = pref_cipher ?
 986                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 987                         s->hit = 1;
 988                         }
 989                 }
 990 #endif /* OPENSSL_NO_TLSEXT */
 991
 992         if (!s->hit && j != 0 && j == s->session->session_id_length
 993             && memcmp(p,s->session->session_id,j) == 0)
 994             {
 995             if(s->sid_ctx_length != s->session->sid_ctx_length
 996                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 997                 {
 998                 /* actually a client application bug */
 999                 al=SSL_AD_ILLEGAL_PARAMETER;
1000                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1001                 goto f_err;
1002                 }
1003             s->hit=1;
1004             }
1005         /* a miss or crap from the other end */
1006         if (!s->hit)
1007                 {
1008                 /* If we were trying for session-id reuse, make a new
1009                  * SSL_SESSION so we don't stuff up other people */
1010                 if (s->session->session_id_length > 0)
1011                         {
1012                         if (!ssl_get_new_session(s,0))
1013                                 {
1014                                 goto f_err;
1015                                 }
1016                         }
1017                 s->session->session_id_length=j;
1018                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1019                 }
1020         p+=j;
1021         c=ssl_get_cipher_by_char(s,p);
1022         if (c == NULL)
1023                 {
1024                 /* unknown cipher */
1025                 al=SSL_AD_ILLEGAL_PARAMETER;
1026                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1027                 goto f_err;
1028                 }
1029         /* If it is a disabled cipher we didn't send it in client hello,
1030          * so return an error.
1031          */
1032         if (c->algorithm_ssl & ct->mask_ssl ||
1033                 c->algorithm_mkey & ct->mask_k ||
1034                 c->algorithm_auth & ct->mask_a)
1035                 {
1036                 al=SSL_AD_ILLEGAL_PARAMETER;
1037                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1038                 goto f_err;
1039                 }
1040         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1041
1042         sk=ssl_get_ciphers_by_id(s);
1043         i=sk_SSL_CIPHER_find(sk,c);
1044         if (i < 0)
1045                 {
1046                 /* we did not say we would use this cipher */
1047                 al=SSL_AD_ILLEGAL_PARAMETER;
1048                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1049                 goto f_err;
1050                 }
1051
1052         /* Depending on the session caching (internal/external), the cipher
1053            and/or cipher_id values may not be set. Make sure that
1054            cipher_id is set and use it for comparison. */
1055         if (s->session->cipher)
1056                 s->session->cipher_id = s->session->cipher->id;
1057         if (s->hit && (s->session->cipher_id != c->id))
1058                 {
1059 /* Workaround is now obsolete */
1060 #if 0
1061                 if (!(s->options &
1062                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1063 #endif
1064                         {
1065                         al=SSL_AD_ILLEGAL_PARAMETER;
1066                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1067                         goto f_err;
1068                         }
1069                 }
1070         s->s3->tmp.new_cipher=c;
1071         /* Don't digest cached records if no sigalgs: we may need them for
1072          * client authentication.
1073          */
1074         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1075                 goto f_err;
1076         /* lets get the compression algorithm */
1077         /* COMPRESSION */
1078 #ifdef OPENSSL_NO_COMP
1079         if (*(p++) != 0)
1080                 {
1081                 al=SSL_AD_ILLEGAL_PARAMETER;
1082                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1083                 goto f_err;
1084                 }
1085         /* If compression is disabled we'd better not try to resume a session
1086          * using compression.
1087          */
1088         if (s->session->compress_meth != 0)
1089                 {
1090                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1091                 goto f_err;
1092                 }
1093 #else
1094         j= *(p++);
1095         if (s->hit && j != s->session->compress_meth)
1096                 {
1097                 al=SSL_AD_ILLEGAL_PARAMETER;
1098                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1099                 goto f_err;
1100                 }
1101         if (j == 0)
1102                 comp=NULL;
1103         else if (s->options & SSL_OP_NO_COMPRESSION)
1104                 {
1105                 al=SSL_AD_ILLEGAL_PARAMETER;
1106                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1107                 goto f_err;
1108                 }
1109         else
1110                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1111
1112         if ((j != 0) && (comp == NULL))
1113                 {
1114                 al=SSL_AD_ILLEGAL_PARAMETER;
1115                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1116                 goto f_err;
1117                 }
1118         else
1119                 {
1120                 s->s3->tmp.new_compression=comp;
1121                 }
1122 #endif
1123
1124 #ifndef OPENSSL_NO_TLSEXT
1125         /* TLS extensions*/
1126         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1127                 {
1128                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1129                 goto err;
1130                 }
1131 #endif
1132
1133         if (p != (d+n))
1134                 {
1135                 /* wrong packet length */
1136                 al=SSL_AD_DECODE_ERROR;
1137                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1138                 goto f_err;
1139                 }
1140
1141         return(1);
1142 f_err:
1143         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1144 err:
1145         return(-1);
1146         }
1147
1148 int ssl3_get_server_certificate(SSL *s)
1149         {
1150         int al,i,ok,ret= -1;
1151         unsigned long n,nc,llen,l;
1152         X509 *x=NULL;
1153         const unsigned char *q,*p;
1154         unsigned char *d;
1155         STACK_OF(X509) *sk=NULL;
1156         SESS_CERT *sc;
1157         EVP_PKEY *pkey=NULL;
1158         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1159
1160         n=s->method->ssl_get_message(s,
1161                 SSL3_ST_CR_CERT_A,
1162                 SSL3_ST_CR_CERT_B,
1163                 -1,
1164                 s->max_cert_list,
1165                 &ok);
1166
1167         if (!ok) return((int)n);
1168
1169         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1170                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1171                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1172                 {
1173                 s->s3->tmp.reuse_message=1;
1174                 return(1);
1175                 }
1176
1177         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1178                 {
1179                 al=SSL_AD_UNEXPECTED_MESSAGE;
1180                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1181                 goto f_err;
1182                 }
1183         p=d=(unsigned char *)s->init_msg;
1184
1185         if ((sk=sk_X509_new_null()) == NULL)
1186                 {
1187                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1188                 goto err;
1189                 }
1190
1191         n2l3(p,llen);
1192         if (llen+3 != n)
1193                 {
1194                 al=SSL_AD_DECODE_ERROR;
1195                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1196                 goto f_err;
1197                 }
1198         for (nc=0; nc<llen; )
1199                 {
1200                 n2l3(p,l);
1201                 if ((l+nc+3) > llen)
1202                         {
1203                         al=SSL_AD_DECODE_ERROR;
1204                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1205                         goto f_err;
1206                         }
1207
1208                 q=p;
1209                 x=d2i_X509(NULL,&q,l);
1210                 if (x == NULL)
1211                         {
1212                         al=SSL_AD_BAD_CERTIFICATE;
1213                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1214                         goto f_err;
1215                         }
1216                 if (q != (p+l))
1217                         {
1218                         al=SSL_AD_DECODE_ERROR;
1219                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1220                         goto f_err;
1221                         }
1222                 if (!sk_X509_push(sk,x))
1223                         {
1224                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1225                         goto err;
1226                         }
1227                 x=NULL;
1228                 nc+=l+3;
1229                 p=q;
1230                 }
1231
1232         i=ssl_verify_cert_chain(s,sk);
1233         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1234 #ifndef OPENSSL_NO_KRB5
1235             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1236                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1237 #endif /* OPENSSL_NO_KRB5 */
1238                 )
1239                 {
1240                 al=ssl_verify_alarm_type(s->verify_result);
1241                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1242                 goto f_err;
1243                 }
1244         ERR_clear_error(); /* but we keep s->verify_result */
1245
1246         sc=ssl_sess_cert_new();
1247         if (sc == NULL) goto err;
1248
1249         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1250         s->session->sess_cert=sc;
1251
1252         sc->cert_chain=sk;
1253         /* Inconsistency alert: cert_chain does include the peer's
1254          * certificate, which we don't include in s3_srvr.c */
1255         x=sk_X509_value(sk,0);
1256         sk=NULL;
1257         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1258
1259         pkey=X509_get_pubkey(x);
1260
1261         /* VRS: allow null cert if auth == KRB5 */
1262         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1263                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1264                     ? 0 : 1;
1265
1266 #ifdef KSSL_DEBUG
1267         fprintf(stderr,"pkey,x = %p, %p\n", pkey,x);
1268         fprintf(stderr,"ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1269         fprintf(stderr,"cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1270                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1271 #endif    /* KSSL_DEBUG */
1272
1273         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1274                 {
1275                 x=NULL;
1276                 al=SSL3_AL_FATAL;
1277                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1278                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1279                 goto f_err;
1280                 }
1281
1282         i=ssl_cert_type(x,pkey);
1283         if (need_cert && i < 0)
1284                 {
1285                 x=NULL;
1286                 al=SSL3_AL_FATAL;
1287                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1288                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1289                 goto f_err;
1290                 }
1291
1292         if (need_cert)
1293                 {
1294                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1295                 if (exp_idx >= 0 && i != exp_idx)
1296                         {
1297                         x=NULL;
1298                         al=SSL_AD_ILLEGAL_PARAMETER;
1299                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1300                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1301                         goto f_err;
1302                         }
1303                 sc->peer_cert_type=i;
1304                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1305                 /* Why would the following ever happen?
1306                  * We just created sc a couple of lines ago. */
1307                 if (sc->peer_pkeys[i].x509 != NULL)
1308                         X509_free(sc->peer_pkeys[i].x509);
1309                 sc->peer_pkeys[i].x509=x;
1310                 sc->peer_key= &(sc->peer_pkeys[i]);
1311
1312                 if (s->session->peer != NULL)
1313                         X509_free(s->session->peer);
1314                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1315                 s->session->peer=x;
1316                 }
1317         else
1318                 {
1319                 sc->peer_cert_type=i;
1320                 sc->peer_key= NULL;
1321
1322                 if (s->session->peer != NULL)
1323                         X509_free(s->session->peer);
1324                 s->session->peer=NULL;
1325                 }
1326         s->session->verify_result = s->verify_result;
1327
1328         x=NULL;
1329         ret=1;
1330         if (0)
1331                 {
1332 f_err:
1333                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1334                 }
1335 err:
1336         EVP_PKEY_free(pkey);
1337         X509_free(x);
1338         sk_X509_pop_free(sk,X509_free);
1339         return(ret);
1340         }
1341
1342 int ssl3_get_key_exchange(SSL *s)
1343         {
1344 #ifndef OPENSSL_NO_RSA
1345         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1346 #endif
1347         EVP_MD_CTX md_ctx;
1348         unsigned char *param,*p;
1349         int al,j,ok;
1350         long i,param_len,n,alg_k,alg_a;
1351         EVP_PKEY *pkey=NULL;
1352         const EVP_MD *md = NULL;
1353 #ifndef OPENSSL_NO_RSA
1354         RSA *rsa=NULL;
1355 #endif
1356 #ifndef OPENSSL_NO_DH
1357         DH *dh=NULL;
1358 #endif
1359 #ifndef OPENSSL_NO_ECDH
1360         EC_KEY *ecdh = NULL;
1361         BN_CTX *bn_ctx = NULL;
1362         EC_POINT *srvr_ecpoint = NULL;
1363         int curve_nid = 0;
1364         int encoded_pt_len = 0;
1365 #endif
1366
1367         EVP_MD_CTX_init(&md_ctx);
1368
1369         /* use same message size as in ssl3_get_certificate_request()
1370          * as ServerKeyExchange message may be skipped */
1371         n=s->method->ssl_get_message(s,
1372                 SSL3_ST_CR_KEY_EXCH_A,
1373                 SSL3_ST_CR_KEY_EXCH_B,
1374                 -1,
1375                 s->max_cert_list,
1376                 &ok);
1377         if (!ok) return((int)n);
1378
1379         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1380
1381         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1382                 {
1383                 /*
1384                  * Can't skip server key exchange if this is an ephemeral
1385                  * ciphersuite.
1386                  */
1387                 if (alg_k & (SSL_kDHE|SSL_kECDHE))
1388                         {
1389                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1390                         al = SSL_AD_UNEXPECTED_MESSAGE;
1391                         goto f_err;
1392                         }
1393 #ifndef OPENSSL_NO_PSK
1394                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1395                    omitted if no identity hint is sent. Set
1396                    session->sess_cert anyway to avoid problems
1397                    later.*/
1398                 if (alg_k & SSL_kPSK)
1399                         {
1400                         s->session->sess_cert=ssl_sess_cert_new();
1401                         if (s->ctx->psk_identity_hint)
1402                                 OPENSSL_free(s->ctx->psk_identity_hint);
1403                         s->ctx->psk_identity_hint = NULL;
1404                         }
1405 #endif
1406                 s->s3->tmp.reuse_message=1;
1407                 return(1);
1408                 }
1409
1410         param=p=(unsigned char *)s->init_msg;
1411         if (s->session->sess_cert != NULL)
1412                 {
1413 #ifndef OPENSSL_NO_RSA
1414                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1415                         {
1416                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1417                         s->session->sess_cert->peer_rsa_tmp=NULL;
1418                         }
1419 #endif
1420 #ifndef OPENSSL_NO_DH
1421                 if (s->session->sess_cert->peer_dh_tmp)
1422                         {
1423                         DH_free(s->session->sess_cert->peer_dh_tmp);
1424                         s->session->sess_cert->peer_dh_tmp=NULL;
1425                         }
1426 #endif
1427 #ifndef OPENSSL_NO_ECDH
1428                 if (s->session->sess_cert->peer_ecdh_tmp)
1429                         {
1430                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1431                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1432                         }
1433 #endif
1434                 }
1435         else
1436                 {
1437                 s->session->sess_cert=ssl_sess_cert_new();
1438                 }
1439
1440         /* Total length of the parameters including the length prefix */
1441         param_len=0;
1442
1443         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1444
1445         al=SSL_AD_DECODE_ERROR;
1446
1447 #ifndef OPENSSL_NO_PSK
1448         if (alg_k & SSL_kPSK)
1449                 {
1450                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1451
1452                 param_len = 2;
1453                 if (param_len > n)
1454                         {
1455                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1456                                 SSL_R_LENGTH_TOO_SHORT);
1457                         goto f_err;
1458                         }
1459                 n2s(p,i);
1460
1461                 /* Store PSK identity hint for later use, hint is used
1462                  * in ssl3_send_client_key_exchange.  Assume that the
1463                  * maximum length of a PSK identity hint can be as
1464                  * long as the maximum length of a PSK identity. */
1465                 if (i > PSK_MAX_IDENTITY_LEN)
1466                         {
1467                         al=SSL_AD_HANDSHAKE_FAILURE;
1468                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1469                                 SSL_R_DATA_LENGTH_TOO_LONG);
1470                         goto f_err;
1471                         }
1472                 if (i > n - param_len)
1473                         {
1474                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1475                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1476                         goto f_err;
1477                         }
1478                 param_len += i;
1479
1480                 /* If received PSK identity hint contains NULL
1481                  * characters, the hint is truncated from the first
1482                  * NULL. p may not be ending with NULL, so create a
1483                  * NULL-terminated string. */
1484                 memcpy(tmp_id_hint, p, i);
1485                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1486                 if (s->ctx->psk_identity_hint != NULL)
1487                         OPENSSL_free(s->ctx->psk_identity_hint);
1488                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1489                 if (s->ctx->psk_identity_hint == NULL)
1490                         {
1491                         al=SSL_AD_HANDSHAKE_FAILURE;
1492                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1493                         goto f_err;
1494                         }
1495
1496                 p+=i;
1497                 n-=param_len;
1498                 }
1499         else
1500 #endif /* !OPENSSL_NO_PSK */
1501 #ifndef OPENSSL_NO_SRP
1502         if (alg_k & SSL_kSRP)
1503                 {
1504                 param_len = 2;
1505                 if (param_len > n)
1506                         {
1507                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1508                                 SSL_R_LENGTH_TOO_SHORT);
1509                         goto f_err;
1510                         }
1511                 n2s(p,i);
1512
1513                 if (i > n - param_len)
1514                         {
1515                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1516                         goto f_err;
1517                         }
1518                 param_len += i;
1519
1520                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1521                         {
1522                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1523                         goto err;
1524                         }
1525                 p+=i;
1526
1527
1528                 if (2 > n - param_len)
1529                         {
1530                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1531                                 SSL_R_LENGTH_TOO_SHORT);
1532                         goto f_err;
1533                         }
1534                 param_len += 2;
1535
1536                 n2s(p,i);
1537
1538                 if (i > n - param_len)
1539                         {
1540                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1541                         goto f_err;
1542                         }
1543                 param_len += i;
1544
1545                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1546                         {
1547                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1548                         goto err;
1549                         }
1550                 p+=i;
1551
1552
1553                 if (1 > n - param_len)
1554                         {
1555                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1556                                 SSL_R_LENGTH_TOO_SHORT);
1557                         goto f_err;
1558                         }
1559                 param_len += 1;
1560
1561                 i = (unsigned int)(p[0]);
1562                 p++;
1563
1564                 if (i > n - param_len)
1565                         {
1566                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1567                         goto f_err;
1568                         }
1569                 param_len += i;
1570
1571                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1572                         {
1573                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1574                         goto err;
1575                         }
1576                 p+=i;
1577
1578                 if (2 > n - param_len)
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1581                                 SSL_R_LENGTH_TOO_SHORT);
1582                         goto f_err;
1583                         }
1584                 param_len += 2;
1585
1586                 n2s(p,i);
1587
1588                 if (i > n - param_len)
1589                         {
1590                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1591                         goto f_err;
1592                         }
1593                 param_len += i;
1594
1595                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1596                         {
1597                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1598                         goto err;
1599                         }
1600                 p+=i;
1601                 n-=param_len;
1602
1603                 if (!srp_verify_server_param(s, &al))
1604                         {
1605                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1606                         goto f_err;
1607                         }
1608
1609 /* We must check if there is a certificate */
1610 #ifndef OPENSSL_NO_RSA
1611                 if (alg_a & SSL_aRSA)
1612                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1613 #else
1614                 if (0)
1615                         ;
1616 #endif
1617 #ifndef OPENSSL_NO_DSA
1618                 else if (alg_a & SSL_aDSS)
1619                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1620 #endif
1621                 }
1622         else
1623 #endif /* !OPENSSL_NO_SRP */
1624 #ifndef OPENSSL_NO_RSA
1625         if (alg_k & SSL_kRSA)
1626                 {
1627                 /* Temporary RSA keys only allowed in export ciphersuites */
1628                 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher))
1629                         {
1630                         al=SSL_AD_UNEXPECTED_MESSAGE;
1631                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1632                         goto f_err;
1633                         }
1634                 if ((rsa=RSA_new()) == NULL)
1635                         {
1636                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1637                         goto err;
1638                         }
1639
1640                 param_len = 2;
1641                 if (param_len > n)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1644                                 SSL_R_LENGTH_TOO_SHORT);
1645                         goto f_err;
1646                         }
1647                 n2s(p,i);
1648
1649                 if (i > n - param_len)
1650                         {
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1652                         goto f_err;
1653                         }
1654                 param_len += i;
1655
1656                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1657                         {
1658                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1659                         goto err;
1660                         }
1661                 p+=i;
1662
1663                 if (2 > n - param_len)
1664                         {
1665                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1666                                 SSL_R_LENGTH_TOO_SHORT);
1667                         goto f_err;
1668                         }
1669                 param_len += 2;
1670
1671                 n2s(p,i);
1672
1673                 if (i > n - param_len)
1674                         {
1675                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1676                         goto f_err;
1677                         }
1678                 param_len += i;
1679
1680                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1681                         {
1682                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1683                         goto err;
1684                         }
1685                 p+=i;
1686                 n-=param_len;
1687
1688                 /* this should be because we are using an export cipher */
1689                 if (alg_a & SSL_aRSA)
1690                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1691                 else
1692                         {
1693                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1694                         goto err;
1695                         }
1696                 s->session->sess_cert->peer_rsa_tmp=rsa;
1697                 rsa=NULL;
1698                 }
1699 #else /* OPENSSL_NO_RSA */
1700         if (0)
1701                 ;
1702 #endif
1703 #ifndef OPENSSL_NO_DH
1704         else if (alg_k & SSL_kEDH)
1705                 {
1706                 if ((dh=DH_new()) == NULL)
1707                         {
1708                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1709                         goto err;
1710                         }
1711
1712                 param_len = 2;
1713                 if (param_len > n)
1714                         {
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1716                                 SSL_R_LENGTH_TOO_SHORT);
1717                         goto f_err;
1718                         }
1719                 n2s(p,i);
1720
1721                 if (i > n - param_len)
1722                         {
1723                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1724                         goto f_err;
1725                         }
1726                 param_len += i;
1727
1728                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1729                         {
1730                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1731                         goto err;
1732                         }
1733                 p+=i;
1734
1735                 if (2 > n - param_len)
1736                         {
1737                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1738                                 SSL_R_LENGTH_TOO_SHORT);
1739                         goto f_err;
1740                         }
1741                 param_len += 2;
1742
1743                 n2s(p,i);
1744
1745                 if (i > n - param_len)
1746                         {
1747                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1748                         goto f_err;
1749                         }
1750                 param_len += i;
1751
1752                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1753                         {
1754                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1755                         goto err;
1756                         }
1757                 p+=i;
1758
1759                 if (2 > n - param_len)
1760                         {
1761                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1762                                 SSL_R_LENGTH_TOO_SHORT);
1763                         goto f_err;
1764                         }
1765                 param_len += 2;
1766
1767                 n2s(p,i);
1768
1769                 if (i > n - param_len)
1770                         {
1771                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1772                         goto f_err;
1773                         }
1774                 param_len += i;
1775
1776                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1777                         {
1778                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1779                         goto err;
1780                         }
1781                 p+=i;
1782                 n-=param_len;
1783
1784 #ifndef OPENSSL_NO_RSA
1785                 if (alg_a & SSL_aRSA)
1786                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1787 #else
1788                 if (0)
1789                         ;
1790 #endif
1791 #ifndef OPENSSL_NO_DSA
1792                 else if (alg_a & SSL_aDSS)
1793                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1794 #endif
1795                 /* else anonymous DH, so no certificate or pkey. */
1796
1797                 s->session->sess_cert->peer_dh_tmp=dh;
1798                 dh=NULL;
1799                 }
1800         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1801                 {
1802                 al=SSL_AD_ILLEGAL_PARAMETER;
1803                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1804                 goto f_err;
1805                 }
1806 #endif /* !OPENSSL_NO_DH */
1807
1808 #ifndef OPENSSL_NO_ECDH
1809         else if (alg_k & SSL_kEECDH)
1810                 {
1811                 EC_GROUP *ngroup;
1812                 const EC_GROUP *group;
1813
1814                 if ((ecdh=EC_KEY_new()) == NULL)
1815                         {
1816                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1817                         goto err;
1818                         }
1819
1820                 /* Extract elliptic curve parameters and the
1821                  * server's ephemeral ECDH public key.
1822                  * Keep accumulating lengths of various components in
1823                  * param_len and make sure it never exceeds n.
1824                  */
1825
1826                 /* XXX: For now we only support named (not generic) curves
1827                  * and the ECParameters in this case is just three bytes. We
1828                  * also need one byte for the length of the encoded point
1829                  */
1830                 param_len=4;
1831                 if (param_len > n)
1832                         {
1833                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1834                                 SSL_R_LENGTH_TOO_SHORT);
1835                         goto f_err;
1836                         }
1837                 /* Check curve is one of our preferences, if not server has
1838                  * sent an invalid curve. ECParameters is 3 bytes.
1839                  */
1840                 if (!tls1_check_curve(s, p, 3))
1841                         {
1842                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1843                         goto f_err;
1844                         }
1845
1846                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1847                         {
1848                         al=SSL_AD_INTERNAL_ERROR;
1849                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1850                         goto f_err;
1851                         }
1852
1853                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1854                 if (ngroup == NULL)
1855                         {
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1857                         goto err;
1858                         }
1859                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1860                         {
1861                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1862                         goto err;
1863                         }
1864                 EC_GROUP_free(ngroup);
1865
1866                 group = EC_KEY_get0_group(ecdh);
1867
1868                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1869                     (EC_GROUP_get_degree(group) > 163))
1870                         {
1871                         al=SSL_AD_EXPORT_RESTRICTION;
1872                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1873                         goto f_err;
1874                         }
1875
1876                 p+=3;
1877
1878                 /* Next, get the encoded ECPoint */
1879                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1880                     ((bn_ctx = BN_CTX_new()) == NULL))
1881                         {
1882                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1883                         goto err;
1884                         }
1885
1886                 encoded_pt_len = *p;  /* length of encoded point */
1887                 p+=1;
1888
1889                 if ((encoded_pt_len > n - param_len) ||
1890                     (EC_POINT_oct2point(group, srvr_ecpoint,
1891                         p, encoded_pt_len, bn_ctx) == 0))
1892                         {
1893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1894                         goto f_err;
1895                         }
1896                 param_len += encoded_pt_len;
1897
1898                 n-=param_len;
1899                 p+=encoded_pt_len;
1900
1901                 /* The ECC/TLS specification does not mention
1902                  * the use of DSA to sign ECParameters in the server
1903                  * key exchange message. We do support RSA and ECDSA.
1904                  */
1905                 if (0) ;
1906 #ifndef OPENSSL_NO_RSA
1907                 else if (alg_a & SSL_aRSA)
1908                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1909 #endif
1910 #ifndef OPENSSL_NO_ECDSA
1911                 else if (alg_a & SSL_aECDSA)
1912                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1913 #endif
1914                 /* else anonymous ECDH, so no certificate or pkey. */
1915                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1916                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1917                 ecdh=NULL;
1918                 BN_CTX_free(bn_ctx);
1919                 bn_ctx = NULL;
1920                 EC_POINT_free(srvr_ecpoint);
1921                 srvr_ecpoint = NULL;
1922                 }
1923         else if (alg_k)
1924                 {
1925                 al=SSL_AD_UNEXPECTED_MESSAGE;
1926                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1927                 goto f_err;
1928                 }
1929 #endif /* !OPENSSL_NO_ECDH */
1930
1931
1932         /* p points to the next byte, there are 'n' bytes left */
1933
1934         /* if it was signed, check the signature */
1935         if (pkey != NULL)
1936                 {
1937                 if (SSL_USE_SIGALGS(s))
1938                         {
1939                         int rv;
1940                         if (2 > n)
1941                                 {
1942                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1943                                         SSL_R_LENGTH_TOO_SHORT);
1944                                 goto f_err;
1945                                 }
1946                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1947                         if (rv == -1)
1948                                 goto err;
1949                         else if (rv == 0)
1950                                 {
1951                                 goto f_err;
1952                                 }
1953 #ifdef SSL_DEBUG
1954 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1955 #endif
1956                         p += 2;
1957                         n -= 2;
1958                         }
1959                 else
1960                         md = EVP_sha1();
1961
1962                 if (2 > n)
1963                         {
1964                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1965                                 SSL_R_LENGTH_TOO_SHORT);
1966                         goto f_err;
1967                         }
1968                 n2s(p,i);
1969                 n-=2;
1970                 j=EVP_PKEY_size(pkey);
1971
1972                 /* Check signature length. If n is 0 then signature is empty */
1973                 if ((i != n) || (n > j) || (n <= 0))
1974                         {
1975                         /* wrong packet length */
1976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1977                         goto f_err;
1978                         }
1979
1980 #ifndef OPENSSL_NO_RSA
1981                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1982                         {
1983                         int num;
1984                         unsigned int size;
1985
1986                         j=0;
1987                         q=md_buf;
1988                         for (num=2; num > 0; num--)
1989                                 {
1990                                 EVP_MD_CTX_set_flags(&md_ctx,
1991                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1992                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1993                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1994                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1995                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1996                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1997                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1998                                 q+=size;
1999                                 j+=size;
2000                                 }
2001                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2002                                                                 pkey->pkey.rsa);
2003                         if (i < 0)
2004                                 {
2005                                 al=SSL_AD_DECRYPT_ERROR;
2006                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2007                                 goto f_err;
2008                                 }
2009                         if (i == 0)
2010                                 {
2011                                 /* bad signature */
2012                                 al=SSL_AD_DECRYPT_ERROR;
2013                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2014                                 goto f_err;
2015                                 }
2016                         }
2017                 else
2018 #endif
2019                         {
2020                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2021                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2022                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2023                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2024                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2025                                 {
2026                                 /* bad signature */
2027                                 al=SSL_AD_DECRYPT_ERROR;
2028                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2029                                 goto f_err;
2030                                 }
2031                         }
2032                 }
2033         else
2034                 {
2035                 /* aNULL, aSRP or kPSK do not need public keys */
2036                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2037                         {
2038                         /* Might be wrong key type, check it */
2039                         if (ssl3_check_cert_and_algorithm(s))
2040                                 /* Otherwise this shouldn't happen */
2041                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2042                         goto err;
2043                         }
2044                 /* still data left over */
2045                 if (n != 0)
2046                         {
2047                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2048                         goto f_err;
2049                         }
2050                 }
2051         EVP_PKEY_free(pkey);
2052         EVP_MD_CTX_cleanup(&md_ctx);
2053         return(1);
2054 f_err:
2055         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2056 err:
2057         EVP_PKEY_free(pkey);
2058 #ifndef OPENSSL_NO_RSA
2059         if (rsa != NULL)
2060                 RSA_free(rsa);
2061 #endif
2062 #ifndef OPENSSL_NO_DH
2063         if (dh != NULL)
2064                 DH_free(dh);
2065 #endif
2066 #ifndef OPENSSL_NO_ECDH
2067         BN_CTX_free(bn_ctx);
2068         EC_POINT_free(srvr_ecpoint);
2069         if (ecdh != NULL)
2070                 EC_KEY_free(ecdh);
2071 #endif
2072         EVP_MD_CTX_cleanup(&md_ctx);
2073         return(-1);
2074         }
2075
2076 int ssl3_get_certificate_request(SSL *s)
2077         {
2078         int ok,ret=0;
2079         unsigned long n,nc,l;
2080         unsigned int llen, ctype_num,i;
2081         X509_NAME *xn=NULL;
2082         const unsigned char *p,*q;
2083         unsigned char *d;
2084         STACK_OF(X509_NAME) *ca_sk=NULL;
2085
2086         n=s->method->ssl_get_message(s,
2087                 SSL3_ST_CR_CERT_REQ_A,
2088                 SSL3_ST_CR_CERT_REQ_B,
2089                 -1,
2090                 s->max_cert_list,
2091                 &ok);
2092
2093         if (!ok) return((int)n);
2094
2095         s->s3->tmp.cert_req=0;
2096
2097         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2098                 {
2099                 s->s3->tmp.reuse_message=1;
2100                 /* If we get here we don't need any cached handshake records
2101                  * as we wont be doing client auth.
2102                  */
2103                 if (s->s3->handshake_buffer)
2104                         {
2105                         if (!ssl3_digest_cached_records(s))
2106                                 goto err;
2107                         }
2108                 return(1);
2109                 }
2110
2111         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2112                 {
2113                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2114                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2115                 goto err;
2116                 }
2117
2118         /* TLS does not like anon-DH with client cert */
2119         if (s->version > SSL3_VERSION)
2120                 {
2121                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2122                         {
2123                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2124                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2125                         goto err;
2126                         }
2127                 }
2128
2129         p=d=(unsigned char *)s->init_msg;
2130
2131         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2132                 {
2133                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2134                 goto err;
2135                 }
2136
2137         /* get the certificate types */
2138         ctype_num= *(p++);
2139         if (s->cert->ctypes)
2140                 {
2141                 OPENSSL_free(s->cert->ctypes);
2142                 s->cert->ctypes = NULL;
2143                 }
2144         if (ctype_num > SSL3_CT_NUMBER)
2145                 {
2146                 /* If we exceed static buffer copy all to cert structure */
2147                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2148                 memcpy(s->cert->ctypes, p, ctype_num);
2149                 s->cert->ctype_num = (size_t)ctype_num;
2150                 ctype_num=SSL3_CT_NUMBER;
2151                 }
2152         for (i=0; i<ctype_num; i++)
2153                 s->s3->tmp.ctype[i]= p[i];
2154         p+=p[-1];
2155         if (SSL_USE_SIGALGS(s))
2156                 {
2157                 n2s(p, llen);
2158                 /* Check we have enough room for signature algorithms and
2159                  * following length value.
2160                  */
2161                 if ((unsigned long)(p - d + llen + 2) > n)
2162                         {
2163                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2164                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2165                         goto err;
2166                         }
2167                 /* Clear certificate digests and validity flags */
2168                 for (i = 0; i < SSL_PKEY_NUM; i++)
2169                         {
2170                         s->cert->pkeys[i].digest = NULL;
2171                         s->cert->pkeys[i].valid_flags = 0;
2172                         }
2173                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2174                         {
2175                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2176                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2177                         goto err;
2178                         }
2179                 if (!tls1_process_sigalgs(s))
2180                         {
2181                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2182                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2183                         goto err;
2184                         }
2185                 p += llen;
2186                 }
2187
2188         /* get the CA RDNs */
2189         n2s(p,llen);
2190 #if 0
2191 {
2192 FILE *out;
2193 out=fopen("/tmp/vsign.der","w");
2194 fwrite(p,1,llen,out);
2195 fclose(out);
2196 }
2197 #endif
2198
2199         if ((unsigned long)(p - d + llen) != n)
2200                 {
2201                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2202                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2203                 goto err;
2204                 }
2205
2206         for (nc=0; nc<llen; )
2207                 {
2208                 n2s(p,l);
2209                 if ((l+nc+2) > llen)
2210                         {
2211                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2212                                 goto cont; /* netscape bugs */
2213                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2214                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2215                         goto err;
2216                         }
2217
2218                 q=p;
2219
2220                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2221                         {
2222                         /* If netscape tolerance is on, ignore errors */
2223                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2224                                 goto cont;
2225                         else
2226                                 {
2227                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2228                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2229                                 goto err;
2230                                 }
2231                         }
2232
2233                 if (q != (p+l))
2234                         {
2235                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2236                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2237                         goto err;
2238                         }
2239                 if (!sk_X509_NAME_push(ca_sk,xn))
2240                         {
2241                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2242                         goto err;
2243                         }
2244
2245                 p+=l;
2246                 nc+=l+2;
2247                 }
2248
2249         if (0)
2250                 {
2251 cont:
2252                 ERR_clear_error();
2253                 }
2254
2255         /* we should setup a certificate to return.... */
2256         s->s3->tmp.cert_req=1;
2257         s->s3->tmp.ctype_num=ctype_num;
2258         if (s->s3->tmp.ca_names != NULL)
2259                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2260         s->s3->tmp.ca_names=ca_sk;
2261         ca_sk=NULL;
2262
2263         ret=1;
2264 err:
2265         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2266         return(ret);
2267         }
2268
2269 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2270         {
2271         return(X509_NAME_cmp(*a,*b));
2272         }
2273 #ifndef OPENSSL_NO_TLSEXT
2274 int ssl3_get_new_session_ticket(SSL *s)
2275         {
2276         int ok,al,ret=0, ticklen;
2277         long n;
2278         const unsigned char *p;
2279         unsigned char *d;
2280
2281         n=s->method->ssl_get_message(s,
2282                 SSL3_ST_CR_SESSION_TICKET_A,
2283                 SSL3_ST_CR_SESSION_TICKET_B,
2284                 SSL3_MT_NEWSESSION_TICKET,
2285                 16384,
2286                 &ok);
2287
2288         if (!ok)
2289                 return((int)n);
2290
2291         if (n < 6)
2292                 {
2293                 /* need at least ticket_lifetime_hint + ticket length */
2294                 al = SSL_AD_DECODE_ERROR;
2295                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2296                 goto f_err;
2297                 }
2298
2299         p=d=(unsigned char *)s->init_msg;
2300         n2l(p, s->session->tlsext_tick_lifetime_hint);
2301         n2s(p, ticklen);
2302         /* ticket_lifetime_hint + ticket_length + ticket */
2303         if (ticklen + 6 != n)
2304                 {
2305                 al = SSL_AD_DECODE_ERROR;
2306                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2307                 goto f_err;
2308                 }
2309         if (s->session->tlsext_tick)
2310                 {
2311                 OPENSSL_free(s->session->tlsext_tick);
2312                 s->session->tlsext_ticklen = 0;
2313                 }
2314         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2315         if (!s->session->tlsext_tick)
2316                 {
2317                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2318                 goto err;
2319                 }
2320         memcpy(s->session->tlsext_tick, p, ticklen);
2321         s->session->tlsext_ticklen = ticklen;
2322         /* There are two ways to detect a resumed ticket session.
2323          * One is to set an appropriate session ID and then the server
2324          * must return a match in ServerHello. This allows the normal
2325          * client session ID matching to work and we know much
2326          * earlier that the ticket has been accepted.
2327          *
2328          * The other way is to set zero length session ID when the
2329          * ticket is presented and rely on the handshake to determine
2330          * session resumption.
2331          *
2332          * We choose the former approach because this fits in with
2333          * assumptions elsewhere in OpenSSL. The session ID is set
2334          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2335          * ticket.
2336          */
2337         EVP_Digest(p, ticklen,
2338                         s->session->session_id, &s->session->session_id_length,
2339 #ifndef OPENSSL_NO_SHA256
2340                                                         EVP_sha256(), NULL);
2341 #else
2342                                                         EVP_sha1(), NULL);
2343 #endif
2344         ret=1;
2345         return(ret);
2346 f_err:
2347         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2348 err:
2349         return(-1);
2350         }
2351
2352 int ssl3_get_cert_status(SSL *s)
2353         {
2354         int ok, al;
2355         unsigned long resplen,n;
2356         const unsigned char *p;
2357
2358         n=s->method->ssl_get_message(s,
2359                 SSL3_ST_CR_CERT_STATUS_A,
2360                 SSL3_ST_CR_CERT_STATUS_B,
2361                 SSL3_MT_CERTIFICATE_STATUS,
2362                 16384,
2363                 &ok);
2364
2365         if (!ok) return((int)n);
2366         if (n < 4)
2367                 {
2368                 /* need at least status type + length */
2369                 al = SSL_AD_DECODE_ERROR;
2370                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2371                 goto f_err;
2372                 }
2373         p = (unsigned char *)s->init_msg;
2374         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2375                 {
2376                 al = SSL_AD_DECODE_ERROR;
2377                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2378                 goto f_err;
2379                 }
2380         n2l3(p, resplen);
2381         if (resplen + 4 != n)
2382                 {
2383                 al = SSL_AD_DECODE_ERROR;
2384                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2385                 goto f_err;
2386                 }
2387         if (s->tlsext_ocsp_resp)
2388                 OPENSSL_free(s->tlsext_ocsp_resp);
2389         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2390         if (!s->tlsext_ocsp_resp)
2391                 {
2392                 al = SSL_AD_INTERNAL_ERROR;
2393                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2394                 goto f_err;
2395                 }
2396         s->tlsext_ocsp_resplen = resplen;
2397         if (s->ctx->tlsext_status_cb)
2398                 {
2399                 int ret;
2400                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2401                 if (ret == 0)
2402                         {
2403                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2404                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2405                         goto f_err;
2406                         }
2407                 if (ret < 0)
2408                         {
2409                         al = SSL_AD_INTERNAL_ERROR;
2410                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2411                         goto f_err;
2412                         }
2413                 }
2414         return 1;
2415 f_err:
2416         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2417         return(-1);
2418         }
2419 #endif
2420
2421 int ssl3_get_server_done(SSL *s)
2422         {
2423         int ok,ret=0;
2424         long n;
2425
2426         n=s->method->ssl_get_message(s,
2427                 SSL3_ST_CR_SRVR_DONE_A,
2428                 SSL3_ST_CR_SRVR_DONE_B,
2429                 SSL3_MT_SERVER_DONE,
2430                 30, /* should be very small, like 0 :-) */
2431                 &ok);
2432
2433         if (!ok) return((int)n);
2434         if (n > 0)
2435                 {
2436                 /* should contain no data */
2437                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2438                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2439                 return -1;
2440                 }
2441         ret=1;
2442         return(ret);
2443         }
2444
2445
2446 int ssl3_send_client_key_exchange(SSL *s)
2447         {
2448         unsigned char *p;
2449         int n;
2450         unsigned long alg_k;
2451 #ifndef OPENSSL_NO_RSA
2452         unsigned char *q;
2453         EVP_PKEY *pkey=NULL;
2454 #endif
2455 #ifndef OPENSSL_NO_KRB5
2456         KSSL_ERR kssl_err;
2457 #endif /* OPENSSL_NO_KRB5 */
2458 #ifndef OPENSSL_NO_ECDH
2459         EC_KEY *clnt_ecdh = NULL;
2460         const EC_POINT *srvr_ecpoint = NULL;
2461         EVP_PKEY *srvr_pub_pkey = NULL;
2462         unsigned char *encodedPoint = NULL;
2463         int encoded_pt_len = 0;
2464         BN_CTX * bn_ctx = NULL;
2465 #endif
2466
2467         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2468                 {
2469                 p = ssl_handshake_start(s);
2470
2471                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2472
2473                 /* Fool emacs indentation */
2474                 if (0) {}
2475 #ifndef OPENSSL_NO_RSA
2476                 else if (alg_k & SSL_kRSA)
2477                         {
2478                         RSA *rsa;
2479                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2480
2481                         if (s->session->sess_cert == NULL)
2482                                 {
2483                                 /* We should always have a server certificate with SSL_kRSA. */
2484                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2485                                 goto err;
2486                                 }
2487
2488                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2489                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2490                         else
2491                                 {
2492                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2493                                 if ((pkey == NULL) ||
2494                                         (pkey->type != EVP_PKEY_RSA) ||
2495                                         (pkey->pkey.rsa == NULL))
2496                                         {
2497                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2498                                         goto err;
2499                                         }
2500                                 rsa=pkey->pkey.rsa;
2501                                 EVP_PKEY_free(pkey);
2502                                 }
2503
2504                         tmp_buf[0]=s->client_version>>8;
2505                         tmp_buf[1]=s->client_version&0xff;
2506                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2507                                         goto err;
2508
2509                         s->session->master_key_length=sizeof tmp_buf;
2510
2511                         q=p;
2512                         /* Fix buf for TLS and beyond */
2513                         if (s->version > SSL3_VERSION)
2514                                 p+=2;
2515                         n=RSA_public_encrypt(sizeof tmp_buf,
2516                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2517 #ifdef PKCS1_CHECK
2518                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2519                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2520 #endif
2521                         if (n <= 0)
2522                                 {
2523                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2524                                 goto err;
2525                                 }
2526
2527                         /* Fix buf for TLS and beyond */
2528                         if (s->version > SSL3_VERSION)
2529                                 {
2530                                 s2n(n,q);
2531                                 n+=2;
2532                                 }
2533
2534                         s->session->master_key_length=
2535                                 s->method->ssl3_enc->generate_master_secret(s,
2536                                         s->session->master_key,
2537                                         tmp_buf,sizeof tmp_buf);
2538                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2539                         }
2540 #endif
2541 #ifndef OPENSSL_NO_KRB5
2542                 else if (alg_k & SSL_kKRB5)
2543                         {
2544                         krb5_error_code krb5rc;
2545                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2546                         /*  krb5_data   krb5_ap_req;  */
2547                         krb5_data       *enc_ticket;
2548                         krb5_data       authenticator, *authp = NULL;
2549                         EVP_CIPHER_CTX  ciph_ctx;
2550                         const EVP_CIPHER *enc = NULL;
2551                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2552                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2553                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2554                                                 + EVP_MAX_IV_LENGTH];
2555                         int             padl, outl = sizeof(epms);
2556
2557                         EVP_CIPHER_CTX_init(&ciph_ctx);
2558
2559 #ifdef KSSL_DEBUG
2560                         fprintf(stderr,"ssl3_send_client_key_exchange(%lx & %lx)\n",
2561                                 alg_k, SSL_kKRB5);
2562 #endif  /* KSSL_DEBUG */
2563
2564                         authp = NULL;
2565 #ifdef KRB5SENDAUTH
2566                         if (KRB5SENDAUTH)  authp = &authenticator;
2567 #endif  /* KRB5SENDAUTH */
2568
2569                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2570                                 &kssl_err);
2571                         enc = kssl_map_enc(kssl_ctx->enctype);
2572                         if (enc == NULL)
2573                             goto err;
2574 #ifdef KSSL_DEBUG
2575                         {
2576                         fprintf(stderr,"kssl_cget_tkt rtn %d\n", krb5rc);
2577                         if (krb5rc && kssl_err.text)
2578                           fprintf(stderr,"kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2579                         }
2580 #endif  /* KSSL_DEBUG */
2581
2582                         if (krb5rc)
2583                                 {
2584                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2585                                                 SSL_AD_HANDSHAKE_FAILURE);
2586                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2587                                                 kssl_err.reason);
2588                                 goto err;
2589                                 }
2590
2591                         /*-
2592                          * 20010406 VRS - Earlier versions used KRB5 AP_REQ
2593                          * in place of RFC 2712 KerberosWrapper, as in:
2594                          *
2595                          * Send ticket (copy to *p, set n = length)
2596                          * n = krb5_ap_req.length;
2597                          * memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2598                          * if (krb5_ap_req.data)
2599                          *   kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2600                          *
2601                          * Now using real RFC 2712 KerberosWrapper
2602                          * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2603                          * Note: 2712 "opaque" types are here replaced
2604                          * with a 2-byte length followed by the value.
2605                          * Example:
2606                          * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2607                          * Where "xx xx" = length bytes.  Shown here with
2608                          * optional authenticator omitted.
2609                          */
2610
2611                         /*  KerberosWrapper.Ticket              */
2612                         s2n(enc_ticket->length,p);
2613                         memcpy(p, enc_ticket->data, enc_ticket->length);
2614                         p+= enc_ticket->length;
2615                         n = enc_ticket->length + 2;
2616
2617                         /*  KerberosWrapper.Authenticator       */
2618                         if (authp  &&  authp->length)
2619                                 {
2620                                 s2n(authp->length,p);
2621                                 memcpy(p, authp->data, authp->length);
2622                                 p+= authp->length;
2623                                 n+= authp->length + 2;
2624
2625                                 free(authp->data);
2626                                 authp->data = NULL;
2627                                 authp->length = 0;
2628                                 }
2629                         else
2630                                 {
2631                                 s2n(0,p);/*  null authenticator length  */
2632                                 n+=2;
2633                                 }
2634
2635                             tmp_buf[0]=s->client_version>>8;
2636                             tmp_buf[1]=s->client_version&0xff;
2637                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2638                                 goto err;
2639
2640                         /*-
2641                          * 20010420 VRS.  Tried it this way; failed.
2642                          *      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2643                          *      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2644                          *                              kssl_ctx->length);
2645                          *      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2646                          */
2647
2648                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2649                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2650                                 kssl_ctx->key,iv);
2651                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2652                                 sizeof tmp_buf);
2653                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2654                         outl += padl;
2655                         if (outl > (int)sizeof epms)
2656                                 {
2657                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2658                                 goto err;
2659                                 }
2660                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2661
2662                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2663                         s2n(outl,p);
2664                         memcpy(p, epms, outl);
2665                         p+=outl;
2666                         n+=outl + 2;
2667
2668                         s->session->master_key_length=
2669                                 s->method->ssl3_enc->generate_master_secret(s,
2670                                         s->session->master_key,
2671                                         tmp_buf, sizeof tmp_buf);
2672
2673                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2674                         OPENSSL_cleanse(epms, outl);
2675                         }
2676 #endif
2677 #ifndef OPENSSL_NO_DH
2678                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2679                         {
2680                         DH *dh_srvr,*dh_clnt;
2681                         SESS_CERT *scert = s->session->sess_cert;
2682
2683                         if (scert == NULL)
2684                                 {
2685                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2686                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2687                                 goto err;
2688                                 }
2689
2690                         if (scert->peer_dh_tmp != NULL)
2691                                 dh_srvr=scert->peer_dh_tmp;
2692                         else
2693                                 {
2694                                 /* we get them from the cert */
2695                                 int idx = scert->peer_cert_type;
2696                                 EVP_PKEY *spkey = NULL;
2697                                 dh_srvr = NULL;
2698                                 if (idx >= 0)
2699                                         spkey = X509_get_pubkey(
2700                                                 scert->peer_pkeys[idx].x509);
2701                                 if (spkey)
2702                                         {
2703                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2704                                         EVP_PKEY_free(spkey);
2705                                         }
2706                                 if (dh_srvr == NULL)
2707                                         {
2708                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2709                                             ERR_R_INTERNAL_ERROR);
2710                                         goto err;
2711                                         }
2712                                 }
2713                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2714                                 {
2715                                 /* Use client certificate key */
2716                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2717                                 dh_clnt = NULL;
2718                                 if (clkey)
2719                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2720                                 if (dh_clnt == NULL)
2721                                         {
2722                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2723                                             ERR_R_INTERNAL_ERROR);
2724                                         goto err;
2725                                         }
2726                                 }
2727                         else
2728                                 {
2729                                 /* generate a new random key */
2730                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2731                                         {
2732                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2733                                         goto err;
2734                                         }
2735                                 if (!DH_generate_key(dh_clnt))
2736                                         {
2737                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2738                                         DH_free(dh_clnt);
2739                                         goto err;
2740                                         }
2741                                 }
2742
2743                         /* use the 'p' output buffer for the DH key, but
2744                          * make sure to clear it out afterwards */
2745
2746                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2747                         if (scert->peer_dh_tmp == NULL)
2748                                 DH_free(dh_srvr);
2749
2750                         if (n <= 0)
2751                                 {
2752                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2753                                 DH_free(dh_clnt);
2754                                 goto err;
2755                                 }
2756
2757                         /* generate master key from the result */
2758                         s->session->master_key_length=
2759                                 s->method->ssl3_enc->generate_master_secret(s,
2760                                         s->session->master_key,p,n);
2761                         /* clean up */
2762                         memset(p,0,n);
2763
2764                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2765                                 n = 0;
2766                         else
2767                                 {
2768                                 /* send off the data */
2769                                 n=BN_num_bytes(dh_clnt->pub_key);
2770                                 s2n(n,p);
2771                                 BN_bn2bin(dh_clnt->pub_key,p);
2772                                 n+=2;
2773                                 }
2774
2775                         DH_free(dh_clnt);
2776
2777                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2778                         }
2779 #endif
2780
2781 #ifndef OPENSSL_NO_ECDH
2782                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2783                         {
2784                         const EC_GROUP *srvr_group = NULL;
2785                         EC_KEY *tkey;
2786                         int ecdh_clnt_cert = 0;
2787                         int field_size = 0;
2788
2789                         if (s->session->sess_cert == NULL)
2790                                 {
2791                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2792                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2793                                 goto err;
2794                                 }
2795
2796                         /* Did we send out the client's
2797                          * ECDH share for use in premaster
2798                          * computation as part of client certificate?
2799                          * If so, set ecdh_clnt_cert to 1.
2800                          */
2801                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2802                                 {
2803                                 /*-
2804                                  * XXX: For now, we do not support client
2805                                  * authentication using ECDH certificates.
2806                                  * To add such support, one needs to add
2807                                  * code that checks for appropriate
2808                                  * conditions and sets ecdh_clnt_cert to 1.
2809                                  * For example, the cert have an ECC
2810                                  * key on the same curve as the server's
2811                                  * and the key should be authorized for
2812                                  * key agreement.
2813                                  *
2814                                  * One also needs to add code in ssl3_connect
2815                                  * to skip sending the certificate verify
2816                                  * message.
2817                                  *
2818                                  * if ((s->cert->key->privatekey != NULL) &&
2819                                  *     (s->cert->key->privatekey->type ==
2820                                  *      EVP_PKEY_EC) && ...)
2821                                  * ecdh_clnt_cert = 1;
2822                                  */
2823                                 }
2824
2825                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2826                                 {
2827                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2828                                 }
2829                         else
2830                                 {
2831                                 /* Get the Server Public Key from Cert */
2832                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2833                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2834                                 if ((srvr_pub_pkey == NULL) ||
2835                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2836                                     (srvr_pub_pkey->pkey.ec == NULL))
2837                                         {
2838                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2839                                             ERR_R_INTERNAL_ERROR);
2840                                         goto err;
2841                                         }
2842
2843                                 tkey = srvr_pub_pkey->pkey.ec;
2844                                 }
2845
2846                         srvr_group   = EC_KEY_get0_group(tkey);
2847                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2848
2849                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2850                                 {
2851                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2852                                     ERR_R_INTERNAL_ERROR);
2853                                 goto err;
2854                                 }
2855
2856                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2857                                 {
2858                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2859                                 goto err;
2860                                 }
2861
2862                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2863                                 {
2864                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2865                                 goto err;
2866                                 }
2867                         if (ecdh_clnt_cert)
2868                                 {
2869                                 /* Reuse key info from our certificate
2870                                  * We only need our private key to perform
2871                                  * the ECDH computation.
2872                                  */
2873                                 const BIGNUM *priv_key;
2874                                 tkey = s->cert->key->privatekey->pkey.ec;
2875                                 priv_key = EC_KEY_get0_private_key(tkey);
2876                                 if (priv_key == NULL)
2877                                         {
2878                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2879                                         goto err;
2880                                         }
2881                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2882                                         {
2883                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2884                                         goto err;
2885                                         }
2886                                 }
2887                         else
2888                                 {
2889                                 /* Generate a new ECDH key pair */
2890                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2891                                         {
2892                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2893                                         goto err;
2894                                         }
2895                                 }
2896
2897                         /* use the 'p' output buffer for the ECDH key, but
2898                          * make sure to clear it out afterwards
2899                          */
2900
2901                         field_size = EC_GROUP_get_degree(srvr_group);
2902                         if (field_size <= 0)
2903                                 {
2904                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2905                                        ERR_R_ECDH_LIB);
2906                                 goto err;
2907                                 }
2908                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2909                         if (n <= 0)
2910                                 {
2911                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2912                                        ERR_R_ECDH_LIB);
2913                                 goto err;
2914                                 }
2915
2916                         /* generate master key from the result */
2917                         s->session->master_key_length = s->method->ssl3_enc \
2918                             -> generate_master_secret(s,
2919                                 s->session->master_key,
2920                                 p, n);
2921
2922                         memset(p, 0, n); /* clean up */
2923
2924                         if (ecdh_clnt_cert)
2925                                 {
2926                                 /* Send empty client key exch message */
2927                                 n = 0;
2928                                 }
2929                         else
2930                                 {
2931                                 /* First check the size of encoding and
2932                                  * allocate memory accordingly.
2933                                  */
2934                                 encoded_pt_len =
2935                                     EC_POINT_point2oct(srvr_group,
2936                                         EC_KEY_get0_public_key(clnt_ecdh),
2937                                         POINT_CONVERSION_UNCOMPRESSED,
2938                                         NULL, 0, NULL);
2939
2940                                 encodedPoint = (unsigned char *)
2941                                     OPENSSL_malloc(encoded_pt_len *
2942                                         sizeof(unsigned char));
2943                                 bn_ctx = BN_CTX_new();
2944                                 if ((encodedPoint == NULL) ||
2945                                     (bn_ctx == NULL))
2946                                         {
2947                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2948                                         goto err;
2949                                         }
2950
2951                                 /* Encode the public key */
2952                                 n = EC_POINT_point2oct(srvr_group,
2953                                     EC_KEY_get0_public_key(clnt_ecdh),
2954                                     POINT_CONVERSION_UNCOMPRESSED,
2955                                     encodedPoint, encoded_pt_len, bn_ctx);
2956
2957                                 *p = n; /* length of encoded point */
2958                                 /* Encoded point will be copied here */
2959                                 p += 1;
2960                                 /* copy the point */
2961                                 memcpy((unsigned char *)p, encodedPoint, n);
2962                                 /* increment n to account for length field */
2963                                 n += 1;
2964                                 }
2965
2966                         /* Free allocated memory */
2967                         BN_CTX_free(bn_ctx);
2968                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2969                         if (clnt_ecdh != NULL)
2970                                  EC_KEY_free(clnt_ecdh);
2971                         EVP_PKEY_free(srvr_pub_pkey);
2972                         }
2973 #endif /* !OPENSSL_NO_ECDH */
2974                 else if (alg_k & SSL_kGOST)
2975                         {
2976                         /* GOST key exchange message creation */
2977                         EVP_PKEY_CTX *pkey_ctx;
2978                         X509 *peer_cert;
2979                         size_t msglen;
2980                         unsigned int md_len;
2981                         int keytype;
2982                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2983                         EVP_MD_CTX *ukm_hash;
2984                         EVP_PKEY *pub_key;
2985
2986                         /* Get server sertificate PKEY and create ctx from it */
2987                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2988                         if (!peer_cert)
2989                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2990                         if (!peer_cert)         {
2991                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2992                                         goto err;
2993                                 }
2994
2995                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2996                         /* If we have send a certificate, and certificate key
2997
2998                          * parameters match those of server certificate, use
2999                          * certificate key for key exchange
3000                          */
3001
3002                          /* Otherwise, generate ephemeral key pair */
3003
3004                         EVP_PKEY_encrypt_init(pkey_ctx);
3005                           /* Generate session key */
3006                     RAND_bytes(premaster_secret,32);
3007                         /* If we have client certificate, use its secret as peer key */
3008                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3009                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3010                                         /* If there was an error - just ignore it. Ephemeral key
3011                                         * would be used
3012                                         */
3013                                         ERR_clear_error();
3014                                 }
3015                         }
3016                         /* Compute shared IV and store it in algorithm-specific
3017                          * context data */
3018                         ukm_hash = EVP_MD_CTX_create();
3019                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3020                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3021                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3022                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3023                         EVP_MD_CTX_destroy(ukm_hash);
3024                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3025                                 8,shared_ukm)<0) {
3026                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3027                                                 SSL_R_LIBRARY_BUG);
3028                                         goto err;
3029                                 }
3030                         /* Make GOST keytransport blob message */
3031                         /*Encapsulate it into sequence */
3032                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3033                         msglen=255;
3034                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3035                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3036                                         SSL_R_LIBRARY_BUG);
3037                                 goto err;
3038                         }
3039                         if (msglen >= 0x80)
3040                                 {
3041                                 *(p++)=0x81;
3042                                 *(p++)= msglen & 0xff;
3043                                 n=msglen+3;
3044                                 }
3045                         else
3046                                 {
3047                                 *(p++)= msglen & 0xff;
3048                                 n=msglen+2;
3049                                 }
3050                         memcpy(p, tmp, msglen);
3051                         /* Check if pubkey from client certificate was used */
3052                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3053                                 {
3054                                 /* Set flag "skip certificate verify" */
3055                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3056                                 }
3057                         EVP_PKEY_CTX_free(pkey_ctx);
3058                         s->session->master_key_length=
3059                                 s->method->ssl3_enc->generate_master_secret(s,
3060                                         s->session->master_key,premaster_secret,32);
3061                         EVP_PKEY_free(pub_key);
3062
3063                         }
3064 #ifndef OPENSSL_NO_SRP
3065                 else if (alg_k & SSL_kSRP)
3066                         {
3067                         if (s->srp_ctx.A != NULL)
3068                                 {
3069                                 /* send off the data */
3070                                 n=BN_num_bytes(s->srp_ctx.A);
3071                                 s2n(n,p);
3072                                 BN_bn2bin(s->srp_ctx.A,p);
3073                                 n+=2;
3074                                 }
3075                         else
3076                                 {
3077                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3078                                 goto err;
3079                                 }
3080                         if (s->session->srp_username != NULL)
3081                                 OPENSSL_free(s->session->srp_username);
3082                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3083                         if (s->session->srp_username == NULL)
3084                                 {
3085                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3086                                         ERR_R_MALLOC_FAILURE);
3087                                 goto err;
3088                                 }
3089
3090                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3091                                 {
3092                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3093                                 goto err;
3094                                 }
3095                         }
3096 #endif
3097 #ifndef OPENSSL_NO_PSK
3098                 else if (alg_k & SSL_kPSK)
3099                         {
3100                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3101                          * to return a \0-terminated identity. The last byte
3102                          * is for us for simulating strnlen. */
3103                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3104                         size_t identity_len;
3105                         unsigned char *t = NULL;
3106                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3107                         unsigned int pre_ms_len = 0, psk_len = 0;
3108                         int psk_err = 1;
3109
3110                         n = 0;
3111                         if (s->psk_client_callback == NULL)
3112                                 {
3113                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3114                                         SSL_R_PSK_NO_CLIENT_CB);
3115                                 goto err;
3116                                 }
3117
3118                         memset(identity, 0, sizeof(identity));
3119                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3120                                 identity, sizeof(identity) - 1,
3121                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3122                         if (psk_len > PSK_MAX_PSK_LEN)
3123                                 {
3124                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3125                                         ERR_R_INTERNAL_ERROR);
3126                                 goto psk_err;
3127                                 }
3128                         else if (psk_len == 0)
3129                                 {
3130                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3131                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3132                                 goto psk_err;
3133                                 }
3134                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3135                         identity_len = strlen(identity);
3136                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3137                                 {
3138                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3139                                         ERR_R_INTERNAL_ERROR);
3140                                 goto psk_err;
3141                                 }
3142                         /* create PSK pre_master_secret */
3143                         pre_ms_len = 2+psk_len+2+psk_len;
3144                         t = psk_or_pre_ms;
3145                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3146                         s2n(psk_len, t);
3147                         memset(t, 0, psk_len);
3148                         t+=psk_len;
3149                         s2n(psk_len, t);
3150
3151                         if (s->session->psk_identity_hint != NULL)
3152                                 OPENSSL_free(s->session->psk_identity_hint);
3153                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3154                         if (s->ctx->psk_identity_hint != NULL &&
3155                                 s->session->psk_identity_hint == NULL)
3156                                 {
3157                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3158                                         ERR_R_MALLOC_FAILURE);
3159                                 goto psk_err;
3160                                 }
3161
3162                         if (s->session->psk_identity != NULL)
3163                                 OPENSSL_free(s->session->psk_identity);
3164                         s->session->psk_identity = BUF_strdup(identity);
3165                         if (s->session->psk_identity == NULL)
3166                                 {
3167                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3168                                         ERR_R_MALLOC_FAILURE);
3169                                 goto psk_err;
3170                                 }
3171
3172                         s->session->master_key_length =
3173                                 s->method->ssl3_enc->generate_master_secret(s,
3174                                         s->session->master_key,
3175                                         psk_or_pre_ms, pre_ms_len);
3176                         s2n(identity_len, p);
3177                         memcpy(p, identity, identity_len);
3178                         n = 2 + identity_len;
3179                         psk_err = 0;
3180                 psk_err:
3181                         OPENSSL_cleanse(identity, sizeof(identity));
3182                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3183                         if (psk_err != 0)
3184                                 {
3185                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3186                                 goto err;
3187                                 }
3188                         }
3189 #endif
3190                 else
3191                         {
3192                         ssl3_send_alert(s, SSL3_AL_FATAL,
3193                             SSL_AD_HANDSHAKE_FAILURE);
3194                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3195                             ERR_R_INTERNAL_ERROR);
3196                         goto err;
3197                         }
3198
3199                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3200                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3201                 }
3202
3203         /* SSL3_ST_CW_KEY_EXCH_B */
3204         return ssl_do_write(s);
3205 err:
3206 #ifndef OPENSSL_NO_ECDH
3207         BN_CTX_free(bn_ctx);
3208         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3209         if (clnt_ecdh != NULL)
3210                 EC_KEY_free(clnt_ecdh);
3211         EVP_PKEY_free(srvr_pub_pkey);
3212 #endif
3213         return(-1);
3214         }
3215
3216 int ssl3_send_client_verify(SSL *s)
3217         {
3218         unsigned char *p;
3219         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3220         EVP_PKEY *pkey;
3221         EVP_PKEY_CTX *pctx=NULL;
3222         EVP_MD_CTX mctx;
3223         unsigned u=0;
3224         unsigned long n;
3225         int j;
3226
3227         EVP_MD_CTX_init(&mctx);
3228
3229         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3230                 {
3231                 p= ssl_handshake_start(s);
3232                 pkey=s->cert->key->privatekey;
3233 /* Create context from key and test if sha1 is allowed as digest */
3234                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3235                 EVP_PKEY_sign_init(pctx);
3236                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3237                         {
3238                         if (!SSL_USE_SIGALGS(s))
3239                                 s->method->ssl3_enc->cert_verify_mac(s,
3240                                                 NID_sha1,
3241                                                 &(data[MD5_DIGEST_LENGTH]));
3242                         }
3243                 else
3244                         {
3245                         ERR_clear_error();
3246                         }
3247                 /* For TLS v1.2 send signature algorithm and signature
3248                  * using agreed digest and cached handshake records.
3249                  */
3250                 if (SSL_USE_SIGALGS(s))
3251                         {
3252                         long hdatalen = 0;
3253                         void *hdata;
3254                         const EVP_MD *md = s->cert->key->digest;
3255                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3256                                                                 &hdata);
3257                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3258                                 {
3259                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3260                                                 ERR_R_INTERNAL_ERROR);
3261                                 goto err;
3262                                 }
3263                         p += 2;
3264 #ifdef SSL_DEBUG
3265                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3266                                                         EVP_MD_name(md));
3267 #endif
3268                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3269                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3270                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3271                                 {
3272                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3273                                                 ERR_R_EVP_LIB);
3274                                 goto err;
3275                                 }
3276                         s2n(u,p);
3277                         n = u + 4;
3278                         if (!ssl3_digest_cached_records(s))
3279                                 goto err;
3280                         }
3281                 else
3282 #ifndef OPENSSL_NO_RSA
3283                 if (pkey->type == EVP_PKEY_RSA)
3284                         {
3285                         s->method->ssl3_enc->cert_verify_mac(s,
3286                                 NID_md5,
3287                                 &(data[0]));
3288                         if (RSA_sign(NID_md5_sha1, data,
3289                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3290                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3291                                 {
3292                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3293                                 goto err;
3294                                 }
3295                         s2n(u,p);
3296                         n=u+2;
3297                         }
3298                 else
3299 #endif
3300 #ifndef OPENSSL_NO_DSA
3301                         if (pkey->type == EVP_PKEY_DSA)
3302                         {
3303                         if (!DSA_sign(pkey->save_type,
3304                                 &(data[MD5_DIGEST_LENGTH]),
3305                                 SHA_DIGEST_LENGTH,&(p[2]),
3306                                 (unsigned int *)&j,pkey->pkey.dsa))
3307                                 {
3308                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3309                                 goto err;
3310                                 }
3311                         s2n(j,p);
3312                         n=j+2;
3313                         }
3314                 else
3315 #endif
3316 #ifndef OPENSSL_NO_ECDSA
3317                         if (pkey->type == EVP_PKEY_EC)
3318                         {
3319                         if (!ECDSA_sign(pkey->save_type,
3320                                 &(data[MD5_DIGEST_LENGTH]),
3321                                 SHA_DIGEST_LENGTH,&(p[2]),
3322                                 (unsigned int *)&j,pkey->pkey.ec))
3323                                 {
3324                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3325                                     ERR_R_ECDSA_LIB);
3326                                 goto err;
3327                                 }
3328                         s2n(j,p);
3329                         n=j+2;
3330                         }
3331                 else
3332 #endif
3333                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3334                 {
3335                 unsigned char signbuf[64];
3336                 int i;
3337                 size_t sigsize=64;
3338                 s->method->ssl3_enc->cert_verify_mac(s,
3339                         NID_id_GostR3411_94,
3340                         data);
3341                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3342                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3343                         ERR_R_INTERNAL_ERROR);
3344                         goto err;
3345                 }
3346                 for (i=63,j=0; i>=0; j++, i--) {
3347                         p[2+j]=signbuf[i];
3348                 }
3349                 s2n(j,p);
3350                 n=j+2;
3351                 }
3352                 else
3353                 {
3354                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3355                         goto err;
3356                 }
3357                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3358                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3359                 }
3360         EVP_MD_CTX_cleanup(&mctx);
3361         EVP_PKEY_CTX_free(pctx);
3362         return ssl_do_write(s);
3363 err:
3364         EVP_MD_CTX_cleanup(&mctx);
3365         EVP_PKEY_CTX_free(pctx);
3366         return(-1);
3367         }
3368
3369 /* Check a certificate can be used for client authentication. Currently
3370  * check cert exists, if we have a suitable digest for TLS 1.2 if
3371  * static DH client certificates can be used and optionally checks
3372  * suitability for Suite B.
3373  */
3374 static int ssl3_check_client_certificate(SSL *s)
3375         {
3376         unsigned long alg_k;
3377         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3378                 return 0;
3379         /* If no suitable signature algorithm can't use certificate */
3380         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3381                 return 0;
3382         /* If strict mode check suitability of chain before using it.
3383          * This also adjusts suite B digest if necessary.
3384          */
3385         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3386                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3387                 return 0;
3388         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3389         /* See if we can use client certificate for fixed DH */
3390         if (alg_k & (SSL_kDHr|SSL_kDHd))
3391                 {
3392                 SESS_CERT *scert = s->session->sess_cert;
3393                 int i = scert->peer_cert_type;
3394                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3395                 clkey = s->cert->key->privatekey;
3396                 /* If client key not DH assume it can be used */
3397                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3398                         return 1;
3399                 if (i >= 0)
3400                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3401                 if (spkey)
3402                         {
3403                         /* Compare server and client parameters */
3404                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3405                         EVP_PKEY_free(spkey);
3406                         if (i != 1)
3407                                 return 0;
3408                         }
3409                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3410                 }
3411         return 1;
3412         }
3413
3414 int ssl3_send_client_certificate(SSL *s)
3415         {
3416         X509 *x509=NULL;
3417         EVP_PKEY *pkey=NULL;
3418         int i;
3419
3420         if (s->state == SSL3_ST_CW_CERT_A)
3421                 {
3422                 /* Let cert callback update client certificates if required */
3423                 if (s->cert->cert_cb)
3424                         {
3425                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3426                         if (i < 0)
3427                                 {
3428                                 s->rwstate=SSL_X509_LOOKUP;
3429                                 return -1;
3430                                 }
3431                         if (i == 0)
3432                                 {
3433                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3434                                 return 0;
3435                                 }
3436                         s->rwstate=SSL_NOTHING;
3437                         }
3438                 if (ssl3_check_client_certificate(s))
3439                         s->state=SSL3_ST_CW_CERT_C;
3440                 else
3441                         s->state=SSL3_ST_CW_CERT_B;
3442                 }
3443
3444         /* We need to get a client cert */
3445         if (s->state == SSL3_ST_CW_CERT_B)
3446                 {
3447                 /* If we get an error, we need to
3448                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3449                  * We then get retied later */
3450                 i=0;
3451                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3452                 if (i < 0)
3453                         {
3454                         s->rwstate=SSL_X509_LOOKUP;
3455                         return(-1);
3456                         }
3457                 s->rwstate=SSL_NOTHING;
3458                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3459                         {
3460                         s->state=SSL3_ST_CW_CERT_B;
3461                         if (    !SSL_use_certificate(s,x509) ||
3462                                 !SSL_use_PrivateKey(s,pkey))
3463                                 i=0;
3464                         }
3465                 else if (i == 1)
3466                         {
3467                         i=0;
3468                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3469                         }
3470
3471                 if (x509 != NULL) X509_free(x509);
3472                 if (pkey != NULL) EVP_PKEY_free(pkey);
3473                 if (i && !ssl3_check_client_certificate(s))
3474                         i = 0;
3475                 if (i == 0)
3476                         {
3477                         if (s->version == SSL3_VERSION)
3478                                 {
3479                                 s->s3->tmp.cert_req=0;
3480                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3481                                 return(1);
3482                                 }
3483                         else
3484                                 {
3485                                 s->s3->tmp.cert_req=2;
3486                                 }
3487                         }
3488
3489                 /* Ok, we have a cert */
3490                 s->state=SSL3_ST_CW_CERT_C;
3491                 }
3492
3493         if (s->state == SSL3_ST_CW_CERT_C)
3494                 {
3495                 s->state=SSL3_ST_CW_CERT_D;
3496                 if (!ssl3_output_cert_chain(s,
3497                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3498                         {
3499                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3500                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3501                         return 0;
3502                         }
3503                 }
3504         /* SSL3_ST_CW_CERT_D */
3505         return ssl_do_write(s);
3506         }
3507
3508 #define has_bits(i,m)   (((i)&(m)) == (m))
3509
3510 int ssl3_check_cert_and_algorithm(SSL *s)
3511         {
3512         int i,idx;
3513         long alg_k,alg_a;
3514         EVP_PKEY *pkey=NULL;
3515         SESS_CERT *sc;
3516 #ifndef OPENSSL_NO_RSA
3517         RSA *rsa;
3518 #endif
3519 #ifndef OPENSSL_NO_DH
3520         DH *dh;
3521 #endif
3522
3523         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3524         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3525
3526         /* we don't have a certificate */
3527         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3528                 return(1);
3529
3530         sc=s->session->sess_cert;
3531         if (sc == NULL)
3532                 {
3533                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3534                 goto err;
3535                 }
3536
3537 #ifndef OPENSSL_NO_RSA
3538         rsa=s->session->sess_cert->peer_rsa_tmp;
3539 #endif
3540 #ifndef OPENSSL_NO_DH
3541         dh=s->session->sess_cert->peer_dh_tmp;
3542 #endif
3543
3544         /* This is the passed certificate */
3545
3546         idx=sc->peer_cert_type;
3547 #ifndef OPENSSL_NO_ECDH
3548         if (idx == SSL_PKEY_ECC)
3549                 {
3550                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3551                                                                 s) == 0)
3552                         { /* check failed */
3553                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3554                         goto f_err;
3555                         }
3556                 else
3557                         {
3558                         return 1;
3559                         }
3560                 }
3561         else if (alg_a & SSL_aECDSA)
3562                 {
3563                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3564                 goto f_err;
3565                 }
3566         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3567                 {
3568                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3569                 goto f_err;
3570                 }
3571 #endif
3572         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3573         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3574         EVP_PKEY_free(pkey);
3575
3576
3577         /* Check that we have a certificate if we require one */
3578         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3579                 {
3580                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3581                 goto f_err;
3582                 }
3583 #ifndef OPENSSL_NO_DSA
3584         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3585                 {
3586                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3587                 goto f_err;
3588                 }
3589 #endif
3590 #ifndef OPENSSL_NO_RSA
3591         if ((alg_k & SSL_kRSA) &&
3592                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3593                 {
3594                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3595                 goto f_err;
3596                 }
3597 #endif
3598 #ifndef OPENSSL_NO_DH
3599         if ((alg_k & SSL_kEDH) &&
3600                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3601                 {
3602                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3603                 goto f_err;
3604                 }
3605         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3606                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3607                 {
3608                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3609                 goto f_err;
3610                 }
3611 #ifndef OPENSSL_NO_DSA
3612         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3613                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3614                 {
3615                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3616                 goto f_err;
3617                 }
3618 #endif
3619 #endif
3620
3621         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3622                 {
3623 #ifndef OPENSSL_NO_RSA
3624                 if (alg_k & SSL_kRSA)
3625                         {
3626                         if (rsa == NULL
3627                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3628                                 {
3629                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3630                                 goto f_err;
3631                                 }
3632                         }
3633                 else
3634 #endif
3635 #ifndef OPENSSL_NO_DH
3636                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3637                             {
3638                             if (dh == NULL
3639                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3640                                 {
3641                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3642                                 goto f_err;
3643                                 }
3644                         }
3645                 else
3646 #endif
3647                         {
3648                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3649                         goto f_err;
3650                         }
3651                 }
3652         return(1);
3653 f_err:
3654         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3655 err:
3656         return(0);
3657         }
3658
3659 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3660 int ssl3_send_next_proto(SSL *s)
3661         {
3662         unsigned int len, padding_len;
3663         unsigned char *d;
3664
3665         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3666                 {
3667                 len = s->next_proto_negotiated_len;
3668                 padding_len = 32 - ((len + 2) % 32);
3669                 d = (unsigned char *)s->init_buf->data;
3670                 d[4] = len;
3671                 memcpy(d + 5, s->next_proto_negotiated, len);
3672                 d[5 + len] = padding_len;
3673                 memset(d + 6 + len, 0, padding_len);
3674                 *(d++)=SSL3_MT_NEXT_PROTO;
3675                 l2n3(2 + len + padding_len, d);
3676                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3677                 s->init_num = 4 + 2 + len + padding_len;
3678                 s->init_off = 0;
3679                 }
3680
3681         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3682         }
3683 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3684
3685 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3686         {
3687         int i = 0;
3688 #ifndef OPENSSL_NO_ENGINE
3689         if (s->ctx->client_cert_engine)
3690                 {
3691                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3692                                                 SSL_get_client_CA_list(s),
3693                                                 px509, ppkey, NULL, NULL, NULL);
3694                 if (i != 0)
3695                         return i;
3696                 }
3697 #endif
3698         if (s->ctx->client_cert_cb)
3699                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3700         return i;
3701         }