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                         break;
 277
 278                 case SSL3_ST_CW_CLNT_HELLO_A:
 279                 case SSL3_ST_CW_CLNT_HELLO_B:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 285                         s->init_num=0;
 286
 287                         /* turn on buffering for the next lot of output */
 288                         if (s->bbio != s->wbio)
 289                                 s->wbio=BIO_push(s->bbio,s->wbio);
 290
 291                         break;
 292
 293                 case SSL3_ST_CR_SRVR_HELLO_A:
 294                 case SSL3_ST_CR_SRVR_HELLO_B:
 295                         ret=ssl3_get_server_hello(s);
 296                         if (ret <= 0) goto end;
 297
 298                         if (s->hit)
 299                                 {
 300                                 s->state=SSL3_ST_CR_FINISHED_A;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_ticket_expected)
 303                                         {
 304                                         /* receive renewed session ticket */
 305                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 306                                         }
 307 #endif
 308                                 }
 309                         else
 310                                 s->state=SSL3_ST_CR_CERT_A;
 311                         s->init_num=0;
 312                         break;
 313
 314                 case SSL3_ST_CR_CERT_A:
 315                 case SSL3_ST_CR_CERT_B:
 316                         /* Check if it is anon DH/ECDH, SRP auth */
 317                         /* or PSK */
 318                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 319                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 320                                 {
 321                                 ret=ssl3_get_server_certificate(s);
 322                                 if (ret <= 0) goto end;
 323 #ifndef OPENSSL_NO_TLSEXT
 324                                 if (s->tlsext_status_expected)
 325                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 326                                 else
 327                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 328                                 }
 329                         else
 330                                 {
 331                                 skip = 1;
 332                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 333                                 }
 334 #else
 335                                 }
 336                         else
 337                                 skip=1;
 338
 339                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 340 #endif
 341                         s->init_num=0;
 342                         break;
 343
 344                 case SSL3_ST_CR_KEY_EXCH_A:
 345                 case SSL3_ST_CR_KEY_EXCH_B:
 346                         ret=ssl3_get_key_exchange(s);
 347                         if (ret <= 0) goto end;
 348                         s->state=SSL3_ST_CR_CERT_REQ_A;
 349                         s->init_num=0;
 350
 351                         /* at this point we check that we have the
 352                          * required stuff from the server */
 353                         if (!ssl3_check_cert_and_algorithm(s))
 354                                 {
 355                                 ret= -1;
 356                                 goto end;
 357                                 }
 358                         break;
 359
 360                 case SSL3_ST_CR_CERT_REQ_A:
 361                 case SSL3_ST_CR_CERT_REQ_B:
 362                         ret=ssl3_get_certificate_request(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CR_SRVR_DONE_A:
 369                 case SSL3_ST_CR_SRVR_DONE_B:
 370                         ret=ssl3_get_server_done(s);
 371                         if (ret <= 0) goto end;
 372 #ifndef OPENSSL_NO_SRP
 373                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 374                                 {
 375                                 if ((ret = SRP_Calc_A_param(s))<=0)
 376                                         {
 377                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 378                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 379                                         goto end;
 380                                         }
 381                                 }
 382 #endif
 383                         if (s->s3->tmp.cert_req)
 384                                 s->state=SSL3_ST_CW_CERT_A;
 385                         else
 386                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 387                         s->init_num=0;
 388
 389                         break;
 390
 391                 case SSL3_ST_CW_CERT_A:
 392                 case SSL3_ST_CW_CERT_B:
 393                 case SSL3_ST_CW_CERT_C:
 394                 case SSL3_ST_CW_CERT_D:
 395                         ret=ssl3_send_client_certificate(s);
 396                         if (ret <= 0) goto end;
 397                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 398                         s->init_num=0;
 399                         break;
 400
 401                 case SSL3_ST_CW_KEY_EXCH_A:
 402                 case SSL3_ST_CW_KEY_EXCH_B:
 403                         ret=ssl3_send_client_key_exchange(s);
 404                         if (ret <= 0) goto end;
 405                         /* EAY EAY EAY need to check for DH fix cert
 406                          * sent back */
 407                         /* For TLS, cert_req is set to 2, so a cert chain
 408                          * of nothing is sent, but no verify packet is sent */
 409                         /* XXX: For now, we do not support client
 410                          * authentication in ECDH cipher suites with
 411                          * ECDH (rather than ECDSA) certificates.
 412                          * We need to skip the certificate verify
 413                          * message when client's ECDH public key is sent
 414                          * inside the client certificate.
 415                          */
 416                         if (s->s3->tmp.cert_req == 1)
 417                                 {
 418                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 419                                 }
 420                         else
 421                                 {
 422                                 s->state=SSL3_ST_CW_CHANGE_A;
 423                                 s->s3->change_cipher_spec=0;
 424                                 }
 425                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 426                                 {
 427                                 s->state=SSL3_ST_CW_CHANGE_A;
 428                                 s->s3->change_cipher_spec=0;
 429                                 }
 430
 431                         s->init_num=0;
 432                         break;
 433
 434                 case SSL3_ST_CW_CERT_VRFY_A:
 435                 case SSL3_ST_CW_CERT_VRFY_B:
 436                         ret=ssl3_send_client_verify(s);
 437                         if (ret <= 0) goto end;
 438                         s->state=SSL3_ST_CW_CHANGE_A;
 439                         s->init_num=0;
 440                         s->s3->change_cipher_spec=0;
 441                         break;
 442
 443                 case SSL3_ST_CW_CHANGE_A:
 444                 case SSL3_ST_CW_CHANGE_B:
 445                         ret=ssl3_send_change_cipher_spec(s,
 446                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 447                         if (ret <= 0) goto end;
 448
 449 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 450                         s->state=SSL3_ST_CW_FINISHED_A;
 451 #else
 452                         if (s->s3->next_proto_neg_seen)
 453                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 454                         else
 455                                 s->state=SSL3_ST_CW_FINISHED_A;
 456 #endif
 457                         s->init_num=0;
 458
 459                         s->session->cipher=s->s3->tmp.new_cipher;
 460 #ifdef OPENSSL_NO_COMP
 461                         s->session->compress_meth=0;
 462 #else
 463                         if (s->s3->tmp.new_compression == NULL)
 464                                 s->session->compress_meth=0;
 465                         else
 466                                 s->session->compress_meth=
 467                                         s->s3->tmp.new_compression->id;
 468 #endif
 469                         if (!s->method->ssl3_enc->setup_key_block(s))
 470                                 {
 471                                 ret= -1;
 472                                 goto end;
 473                                 }
 474
 475                         if (!s->method->ssl3_enc->change_cipher_state(s,
 476                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 477                                 {
 478                                 ret= -1;
 479                                 goto end;
 480                                 }
 481
 482                         break;
 483
 484 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 485                 case SSL3_ST_CW_NEXT_PROTO_A:
 486                 case SSL3_ST_CW_NEXT_PROTO_B:
 487                         ret=ssl3_send_next_proto(s);
 488                         if (ret <= 0) goto end;
 489                         s->state=SSL3_ST_CW_FINISHED_A;
 490                         break;
 491 #endif
 492
 493                 case SSL3_ST_CW_FINISHED_A:
 494                 case SSL3_ST_CW_FINISHED_B:
 495                         ret=ssl3_send_finished(s,
 496                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 497                                 s->method->ssl3_enc->client_finished_label,
 498                                 s->method->ssl3_enc->client_finished_label_len);
 499                         if (ret <= 0) goto end;
 500                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 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
 550                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 551                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 552                                 SSL3_ST_CR_FINISHED_B);
 553                         if (ret <= 0) goto end;
 554
 555                         if (s->hit)
 556                                 s->state=SSL3_ST_CW_CHANGE_A;
 557                         else
 558                                 s->state=SSL_ST_OK;
 559                         s->init_num=0;
 560                         break;
 561
 562                 case SSL3_ST_CW_FLUSH:
 563                         s->rwstate=SSL_WRITING;
 564                         if (BIO_flush(s->wbio) <= 0)
 565                                 {
 566                                 ret= -1;
 567                                 goto end;
 568                                 }
 569                         s->rwstate=SSL_NOTHING;
 570                         s->state=s->s3->tmp.next_state;
 571                         break;
 572
 573                 case SSL_ST_OK:
 574                         /* clean a few things up */
 575                         ssl3_cleanup_key_block(s);
 576
 577                         if (s->init_buf != NULL)
 578                                 {
 579                                 BUF_MEM_free(s->init_buf);
 580                                 s->init_buf=NULL;
 581                                 }
 582
 583                         /* If we are not 'joining' the last two packets,
 584                          * remove the buffering now */
 585                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 586                                 ssl_free_wbio_buffer(s);
 587                         /* else do it later in ssl3_write */
 588
 589                         s->init_num=0;
 590                         s->renegotiate=0;
 591                         s->new_session=0;
 592
 593                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 594                         if (s->hit) s->ctx->stats.sess_hit++;
 595
 596                         ret=1;
 597                         /* s->server=0; */
 598                         s->handshake_func=ssl3_connect;
 599                         s->ctx->stats.sess_connect_good++;
 600
 601                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 602
 603                         goto end;
 604                         /* break; */
 605
 606                 default:
 607                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 608                         ret= -1;
 609                         goto end;
 610                         /* break; */
 611                         }
 612
 613                 /* did we do anything */
 614                 if (!s->s3->tmp.reuse_message && !skip)
 615                         {
 616                         if (s->debug)
 617                                 {
 618                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 619                                         goto end;
 620                                 }
 621
 622                         if ((cb != NULL) && (s->state != state))
 623                                 {
 624                                 new_state=s->state;
 625                                 s->state=state;
 626                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 627                                 s->state=new_state;
 628                                 }
 629                         }
 630                 skip=0;
 631                 }
 632 end:
 633         s->in_handshake--;
 634         if (buf != NULL)
 635                 BUF_MEM_free(buf);
 636         if (cb != NULL)
 637                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 638         return(ret);
 639         }
 640
 641
 642 int ssl3_client_hello(SSL *s)
 643         {
 644         unsigned char *buf;
 645         unsigned char *p,*d;
 646         int i;
 647         unsigned long l;
 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                 /* else use the pre-loaded session */
 666
 667                 p=s->s3->client_random;
 668
 669                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 670                         goto err;
 671
 672                 /* Do the message type and length last */
 673                 d=p= &(buf[4]);
 674
 675                 /* version indicates the negotiated version: for example from
 676                  * an SSLv2/v3 compatible client hello). The client_version
 677                  * field is the maximum version we permit and it is also
 678                  * used in RSA encrypted premaster secrets. Some servers can
 679                  * choke if we initially report a higher version then
 680                  * renegotiate to a lower one in the premaster secret. This
 681                  * didn't happen with TLS 1.0 as most servers supported it
 682                  * but it can with TLS 1.1 or later if the server only supports
 683                  * 1.0.
 684                  *
 685                  * Possible scenario with previous logic:
 686                  *      1. Client hello indicates TLS 1.2
 687                  *      2. Server hello says TLS 1.0
 688                  *      3. RSA encrypted premaster secret uses 1.2.
 689                  *      4. Handhaked proceeds using TLS 1.0.
 690                  *      5. Server sends hello request to renegotiate.
 691                  *      6. Client hello indicates TLS v1.0 as we now
 692                  *         know that is maximum server supports.
 693                  *      7. Server chokes on RSA encrypted premaster secret
 694                  *         containing version 1.0.
 695                  *
 696                  * For interoperability it should be OK to always use the
 697                  * maximum version we support in client hello and then rely
 698                  * on the checking of version to ensure the servers isn't
 699                  * being inconsistent: for example initially negotiating with
 700                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 701                  * client_version in client hello and not resetting it to
 702                  * the negotiated version.
 703                  */
 704 #if 0
 705                 *(p++)=s->version>>8;
 706                 *(p++)=s->version&0xff;
 707                 s->client_version=s->version;
 708 #else
 709                 *(p++)=s->client_version>>8;
 710                 *(p++)=s->client_version&0xff;
 711 #endif
 712
 713                 /* Random stuff */
 714                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 715                 p+=SSL3_RANDOM_SIZE;
 716
 717                 /* Session ID */
 718                 if (s->new_session)
 719                         i=0;
 720                 else
 721                         i=s->session->session_id_length;
 722                 *(p++)=i;
 723                 if (i != 0)
 724                         {
 725                         if (i > (int)sizeof(s->session->session_id))
 726                                 {
 727                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 728                                 goto err;
 729                                 }
 730                         memcpy(p,s->session->session_id,i);
 731                         p+=i;
 732                         }
 733
 734                 /* Ciphers supported */
 735                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 736                 if (i == 0)
 737                         {
 738                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 739                         goto err;
 740                         }
 741 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 742                         /* Some servers hang if client hello > 256 bytes
 743                          * as hack workaround chop number of supported ciphers
 744                          * to keep it well below this if we use TLS v1.2
 745                          */
 746                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 747                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 748                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 749 #endif
 750                 s2n(i,p);
 751                 p+=i;
 752
 753                 /* COMPRESSION */
 754 #ifdef OPENSSL_NO_COMP
 755                 *(p++)=1;
 756 #else
 757
 758                 if ((s->options & SSL_OP_NO_COMPRESSION)
 759                                         || !s->ctx->comp_methods)
 760                         j=0;
 761                 else
 762                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 763                 *(p++)=1+j;
 764                 for (i=0; i<j; i++)
 765                         {
 766                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 767                         *(p++)=comp->id;
 768                         }
 769 #endif
 770                 *(p++)=0; /* Add the NULL method */
 771
 772 #ifndef OPENSSL_NO_TLSEXT
 773                 /* TLS extensions*/
 774                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 775                         {
 776                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 777                         goto err;
 778                         }
 779                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 780                         {
 781                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 782                         goto err;
 783                         }
 784 #endif
 785
 786                 l=(p-d);
 787                 d=buf;
 788                 *(d++)=SSL3_MT_CLIENT_HELLO;
 789                 l2n3(l,d);
 790
 791                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 792                 /* number of bytes to write */
 793                 s->init_num=p-buf;
 794                 s->init_off=0;
 795                 }
 796
 797         /* SSL3_ST_CW_CLNT_HELLO_B */
 798         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 799 err:
 800         return(-1);
 801         }
 802
 803 int ssl3_get_server_hello(SSL *s)
 804         {
 805         STACK_OF(SSL_CIPHER) *sk;
 806         const SSL_CIPHER *c;
 807         unsigned char *p,*d;
 808         int i,al,ok;
 809         unsigned int j;
 810         long n;
 811 #ifndef OPENSSL_NO_COMP
 812         SSL_COMP *comp;
 813 #endif
 814
 815         n=s->method->ssl_get_message(s,
 816                 SSL3_ST_CR_SRVR_HELLO_A,
 817                 SSL3_ST_CR_SRVR_HELLO_B,
 818                 -1,
 819                 20000, /* ?? */
 820                 &ok);
 821
 822         if (!ok) return((int)n);
 823
 824         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 825                 {
 826                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 827                         {
 828                         if ( s->d1->send_cookie == 0)
 829                                 {
 830                                 s->s3->tmp.reuse_message = 1;
 831                                 return 1;
 832                                 }
 833                         else /* already sent a cookie */
 834                                 {
 835                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 836                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 837                                 goto f_err;
 838                                 }
 839                         }
 840                 }
 841
 842         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 843                 {
 844                 al=SSL_AD_UNEXPECTED_MESSAGE;
 845                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 846                 goto f_err;
 847                 }
 848
 849         d=p=(unsigned char *)s->init_msg;
 850
 851         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 852                 {
 853                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 854                 s->version=(s->version&0xff00)|p[1];
 855                 al=SSL_AD_PROTOCOL_VERSION;
 856                 goto f_err;
 857                 }
 858         p+=2;
 859
 860         /* load the server hello data */
 861         /* load the server random */
 862         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 863         p+=SSL3_RANDOM_SIZE;
 864
 865         s->hit = 0;
 866
 867         /* get the session-id */
 868         j= *(p++);
 869
 870         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 871                 {
 872                 al=SSL_AD_ILLEGAL_PARAMETER;
 873                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 874                 goto f_err;
 875                 }
 876
 877 #ifndef OPENSSL_NO_TLSEXT
 878         /* check if we want to resume the session based on external pre-shared secret */
 879         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 880                 {
 881                 SSL_CIPHER *pref_cipher=NULL;
 882                 s->session->master_key_length=sizeof(s->session->master_key);
 883                 if (s->tls_session_secret_cb(s, s->session->master_key,
 884                                              &s->session->master_key_length,
 885                                              NULL, &pref_cipher,
 886                                              s->tls_session_secret_cb_arg))
 887                         {
 888                         s->session->cipher = pref_cipher ?
 889                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 890                         s->hit = 1;
 891                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 892                         }
 893                 }
 894 #endif /* OPENSSL_NO_TLSEXT */
 895
 896         if (!s->hit && j != 0 && j == s->session->session_id_length
 897             && memcmp(p,s->session->session_id,j) == 0)
 898             {
 899             if(s->sid_ctx_length != s->session->sid_ctx_length
 900                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 901                 {
 902                 /* actually a client application bug */
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 905                 goto f_err;
 906                 }
 907             s->s3->flags |= SSL3_FLAGS_CCS_OK;
 908             s->hit=1;
 909             }
 910         /* a miss or crap from the other end */
 911         if (!s->hit)
 912                 {
 913                 /* If we were trying for session-id reuse, make a new
 914                  * SSL_SESSION so we don't stuff up other people */
 915                 if (s->session->session_id_length > 0)
 916                         {
 917                         if (!ssl_get_new_session(s,0))
 918                                 {
 919                                 al=SSL_AD_INTERNAL_ERROR;
 920                                 goto f_err;
 921                                 }
 922                         }
 923                 s->session->session_id_length=j;
 924                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 925                 }
 926         p+=j;
 927         c=ssl_get_cipher_by_char(s,p);
 928         if (c == NULL)
 929                 {
 930                 /* unknown cipher */
 931                 al=SSL_AD_ILLEGAL_PARAMETER;
 932                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 933                 goto f_err;
 934                 }
 935         /* TLS v1.2 only ciphersuites require v1.2 or later */
 936         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 937                 (TLS1_get_version(s) < TLS1_2_VERSION))
 938                 {
 939                 al=SSL_AD_ILLEGAL_PARAMETER;
 940                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 941                 goto f_err;
 942                 }
 943 #ifndef OPENSSL_NO_SRP
 944         if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) &&
 945                     !(s->srp_ctx.srp_Mask & SSL_kSRP))
 946                 {
 947                 al=SSL_AD_ILLEGAL_PARAMETER;
 948                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 949                 goto f_err;
 950                 }
 951 #endif /* OPENSSL_NO_SRP */
 952         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 953
 954         sk=ssl_get_ciphers_by_id(s);
 955         i=sk_SSL_CIPHER_find(sk,c);
 956         if (i < 0)
 957                 {
 958                 /* we did not say we would use this cipher */
 959                 al=SSL_AD_ILLEGAL_PARAMETER;
 960                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 961                 goto f_err;
 962                 }
 963
 964         /* Depending on the session caching (internal/external), the cipher
 965            and/or cipher_id values may not be set. Make sure that
 966            cipher_id is set and use it for comparison. */
 967         if (s->session->cipher)
 968                 s->session->cipher_id = s->session->cipher->id;
 969         if (s->hit && (s->session->cipher_id != c->id))
 970                 {
 971 /* Workaround is now obsolete */
 972 #if 0
 973                 if (!(s->options &
 974                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 975 #endif
 976                         {
 977                         al=SSL_AD_ILLEGAL_PARAMETER;
 978                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 979                         goto f_err;
 980                         }
 981                 }
 982         s->s3->tmp.new_cipher=c;
 983         /* Don't digest cached records if TLS v1.2: we may need them for
 984          * client authentication.
 985          */
 986         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 987                 {
 988                 al = SSL_AD_INTERNAL_ERROR;
 989                 goto f_err;
 990                 }
 991         /* lets get the compression algorithm */
 992         /* COMPRESSION */
 993 #ifdef OPENSSL_NO_COMP
 994         if (*(p++) != 0)
 995                 {
 996                 al=SSL_AD_ILLEGAL_PARAMETER;
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 998                 goto f_err;
 999                 }
1000         /* If compression is disabled we'd better not try to resume a session
1001          * using compression.
1002          */
1003         if (s->session->compress_meth != 0)
1004                 {
1005                 al=SSL_AD_INTERNAL_ERROR;
1006                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1007                 goto f_err;
1008                 }
1009 #else
1010         j= *(p++);
1011         if (s->hit && j != s->session->compress_meth)
1012                 {
1013                 al=SSL_AD_ILLEGAL_PARAMETER;
1014                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1015                 goto f_err;
1016                 }
1017         if (j == 0)
1018                 comp=NULL;
1019         else if (s->options & SSL_OP_NO_COMPRESSION)
1020                 {
1021                 al=SSL_AD_ILLEGAL_PARAMETER;
1022                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1023                 goto f_err;
1024                 }
1025         else
1026                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1027
1028         if ((j != 0) && (comp == NULL))
1029                 {
1030                 al=SSL_AD_ILLEGAL_PARAMETER;
1031                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1032                 goto f_err;
1033                 }
1034         else
1035                 {
1036                 s->s3->tmp.new_compression=comp;
1037                 }
1038 #endif
1039
1040 #ifndef OPENSSL_NO_TLSEXT
1041         /* TLS extensions*/
1042         if (s->version >= SSL3_VERSION)
1043                 {
1044                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1045                         {
1046                         /* 'al' set by ssl_parse_serverhello_tlsext */
1047                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1048                         goto f_err;
1049                         }
1050                 if (ssl_check_serverhello_tlsext(s) <= 0)
1051                         {
1052                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1053                                 goto err;
1054                         }
1055                 }
1056 #endif
1057
1058         if (p != (d+n))
1059                 {
1060                 /* wrong packet length */
1061                 al=SSL_AD_DECODE_ERROR;
1062                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1063                 goto f_err;
1064                 }
1065
1066         return(1);
1067 f_err:
1068         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1069 err:
1070         return(-1);
1071         }
1072
1073 int ssl3_get_server_certificate(SSL *s)
1074         {
1075         int al,i,ok,ret= -1;
1076         unsigned long n,nc,llen,l;
1077         X509 *x=NULL;
1078         const unsigned char *q,*p;
1079         unsigned char *d;
1080         STACK_OF(X509) *sk=NULL;
1081         SESS_CERT *sc;
1082         EVP_PKEY *pkey=NULL;
1083         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1084
1085         n=s->method->ssl_get_message(s,
1086                 SSL3_ST_CR_CERT_A,
1087                 SSL3_ST_CR_CERT_B,
1088                 -1,
1089                 s->max_cert_list,
1090                 &ok);
1091
1092         if (!ok) return((int)n);
1093
1094         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1095                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1096                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1097                 {
1098                 s->s3->tmp.reuse_message=1;
1099                 return(1);
1100                 }
1101
1102         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1103                 {
1104                 al=SSL_AD_UNEXPECTED_MESSAGE;
1105                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1106                 goto f_err;
1107                 }
1108         p=d=(unsigned char *)s->init_msg;
1109
1110         if ((sk=sk_X509_new_null()) == NULL)
1111                 {
1112                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1113                 goto err;
1114                 }
1115
1116         n2l3(p,llen);
1117         if (llen+3 != n)
1118                 {
1119                 al=SSL_AD_DECODE_ERROR;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1121                 goto f_err;
1122                 }
1123         for (nc=0; nc<llen; )
1124                 {
1125                 n2l3(p,l);
1126                 if ((l+nc+3) > llen)
1127                         {
1128                         al=SSL_AD_DECODE_ERROR;
1129                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1130                         goto f_err;
1131                         }
1132
1133                 q=p;
1134                 x=d2i_X509(NULL,&q,l);
1135                 if (x == NULL)
1136                         {
1137                         al=SSL_AD_BAD_CERTIFICATE;
1138                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1139                         goto f_err;
1140                         }
1141                 if (q != (p+l))
1142                         {
1143                         al=SSL_AD_DECODE_ERROR;
1144                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1145                         goto f_err;
1146                         }
1147                 if (!sk_X509_push(sk,x))
1148                         {
1149                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1150                         goto err;
1151                         }
1152                 x=NULL;
1153                 nc+=l+3;
1154                 p=q;
1155                 }
1156
1157         i=ssl_verify_cert_chain(s,sk);
1158         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1159 #ifndef OPENSSL_NO_KRB5
1160             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1161                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1162 #endif /* OPENSSL_NO_KRB5 */
1163                 )
1164                 {
1165                 al=ssl_verify_alarm_type(s->verify_result);
1166                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1167                 goto f_err;
1168                 }
1169         ERR_clear_error(); /* but we keep s->verify_result */
1170
1171         sc=ssl_sess_cert_new();
1172         if (sc == NULL) goto err;
1173
1174         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1175         s->session->sess_cert=sc;
1176
1177         sc->cert_chain=sk;
1178         /* Inconsistency alert: cert_chain does include the peer's
1179          * certificate, which we don't include in s3_srvr.c */
1180         x=sk_X509_value(sk,0);
1181         sk=NULL;
1182         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1183
1184         pkey=X509_get_pubkey(x);
1185
1186         /* VRS: allow null cert if auth == KRB5 */
1187         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1188                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1189                     ? 0 : 1;
1190
1191 #ifdef KSSL_DEBUG
1192         printf("pkey,x = %p, %p\n", pkey,x);
1193         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1194         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1195                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1196 #endif    /* KSSL_DEBUG */
1197
1198         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1199                 {
1200                 x=NULL;
1201                 al=SSL3_AL_FATAL;
1202                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1203                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1204                 goto f_err;
1205                 }
1206
1207         i=ssl_cert_type(x,pkey);
1208         if (need_cert && i < 0)
1209                 {
1210                 x=NULL;
1211                 al=SSL3_AL_FATAL;
1212                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1213                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1214                 goto f_err;
1215                 }
1216
1217         if (need_cert)
1218                 {
1219                 sc->peer_cert_type=i;
1220                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1221                 /* Why would the following ever happen?
1222                  * We just created sc a couple of lines ago. */
1223                 if (sc->peer_pkeys[i].x509 != NULL)
1224                         X509_free(sc->peer_pkeys[i].x509);
1225                 sc->peer_pkeys[i].x509=x;
1226                 sc->peer_key= &(sc->peer_pkeys[i]);
1227
1228                 if (s->session->peer != NULL)
1229                         X509_free(s->session->peer);
1230                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1231                 s->session->peer=x;
1232                 }
1233         else
1234                 {
1235                 sc->peer_cert_type=i;
1236                 sc->peer_key= NULL;
1237
1238                 if (s->session->peer != NULL)
1239                         X509_free(s->session->peer);
1240                 s->session->peer=NULL;
1241                 }
1242         s->session->verify_result = s->verify_result;
1243
1244         x=NULL;
1245         ret=1;
1246
1247         if (0)
1248                 {
1249 f_err:
1250                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1251                 }
1252 err:
1253         EVP_PKEY_free(pkey);
1254         X509_free(x);
1255         sk_X509_pop_free(sk,X509_free);
1256         return(ret);
1257         }
1258
1259 int ssl3_get_key_exchange(SSL *s)
1260         {
1261 #ifndef OPENSSL_NO_RSA
1262         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1263 #endif
1264         EVP_MD_CTX md_ctx;
1265         unsigned char *param,*p;
1266         int al,j,ok;
1267         long i,param_len,n,alg_k,alg_a;
1268         EVP_PKEY *pkey=NULL;
1269         const EVP_MD *md = NULL;
1270 #ifndef OPENSSL_NO_RSA
1271         RSA *rsa=NULL;
1272 #endif
1273 #ifndef OPENSSL_NO_DH
1274         DH *dh=NULL;
1275 #endif
1276 #ifndef OPENSSL_NO_ECDH
1277         EC_KEY *ecdh = NULL;
1278         BN_CTX *bn_ctx = NULL;
1279         EC_POINT *srvr_ecpoint = NULL;
1280         int curve_nid = 0;
1281         int encoded_pt_len = 0;
1282 #endif
1283
1284         /* use same message size as in ssl3_get_certificate_request()
1285          * as ServerKeyExchange message may be skipped */
1286         n=s->method->ssl_get_message(s,
1287                 SSL3_ST_CR_KEY_EXCH_A,
1288                 SSL3_ST_CR_KEY_EXCH_B,
1289                 -1,
1290                 s->max_cert_list,
1291                 &ok);
1292         if (!ok) return((int)n);
1293
1294         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1295                 {
1296 #ifndef OPENSSL_NO_PSK
1297                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1298                    omitted if no identity hint is sent. Set
1299                    session->sess_cert anyway to avoid problems
1300                    later.*/
1301                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1302                         {
1303                         s->session->sess_cert=ssl_sess_cert_new();
1304                         if (s->ctx->psk_identity_hint)
1305                                 OPENSSL_free(s->ctx->psk_identity_hint);
1306                         s->ctx->psk_identity_hint = NULL;
1307                         }
1308 #endif
1309                 s->s3->tmp.reuse_message=1;
1310                 return(1);
1311                 }
1312
1313         param=p=(unsigned char *)s->init_msg;
1314         if (s->session->sess_cert != NULL)
1315                 {
1316 #ifndef OPENSSL_NO_RSA
1317                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1318                         {
1319                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1320                         s->session->sess_cert->peer_rsa_tmp=NULL;
1321                         }
1322 #endif
1323 #ifndef OPENSSL_NO_DH
1324                 if (s->session->sess_cert->peer_dh_tmp)
1325                         {
1326                         DH_free(s->session->sess_cert->peer_dh_tmp);
1327                         s->session->sess_cert->peer_dh_tmp=NULL;
1328                         }
1329 #endif
1330 #ifndef OPENSSL_NO_ECDH
1331                 if (s->session->sess_cert->peer_ecdh_tmp)
1332                         {
1333                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1334                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1335                         }
1336 #endif
1337                 }
1338         else
1339                 {
1340                 s->session->sess_cert=ssl_sess_cert_new();
1341                 }
1342
1343         /* Total length of the parameters including the length prefix */
1344         param_len=0;
1345
1346         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1347         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1348         EVP_MD_CTX_init(&md_ctx);
1349
1350         al=SSL_AD_DECODE_ERROR;
1351
1352 #ifndef OPENSSL_NO_PSK
1353         if (alg_k & SSL_kPSK)
1354                 {
1355                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1356
1357                 param_len = 2;
1358                 if (param_len > n)
1359                         {
1360                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1361                                 SSL_R_LENGTH_TOO_SHORT);
1362                         goto f_err;
1363                         }
1364                 n2s(p,i);
1365
1366                 /* Store PSK identity hint for later use, hint is used
1367                  * in ssl3_send_client_key_exchange.  Assume that the
1368                  * maximum length of a PSK identity hint can be as
1369                  * long as the maximum length of a PSK identity. */
1370                 if (i > PSK_MAX_IDENTITY_LEN)
1371                         {
1372                         al=SSL_AD_HANDSHAKE_FAILURE;
1373                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1374                                 SSL_R_DATA_LENGTH_TOO_LONG);
1375                         goto f_err;
1376                         }
1377                 if (i > n - param_len)
1378                         {
1379                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1380                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1381                         goto f_err;
1382                         }
1383                 param_len += i;
1384
1385                 /* If received PSK identity hint contains NULL
1386                  * characters, the hint is truncated from the first
1387                  * NULL. p may not be ending with NULL, so create a
1388                  * NULL-terminated string. */
1389                 memcpy(tmp_id_hint, p, i);
1390                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1391                 if (s->ctx->psk_identity_hint != NULL)
1392                         OPENSSL_free(s->ctx->psk_identity_hint);
1393                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1394                 if (s->ctx->psk_identity_hint == NULL)
1395                         {
1396                         al=SSL_AD_HANDSHAKE_FAILURE;
1397                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1398                         goto f_err;
1399                         }
1400
1401                 p+=i;
1402                 n-=param_len;
1403                 }
1404         else
1405 #endif /* !OPENSSL_NO_PSK */
1406 #ifndef OPENSSL_NO_SRP
1407         if (alg_k & SSL_kSRP)
1408                 {
1409                 param_len = 2;
1410                 if (param_len > n)
1411                         {
1412                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1413                                 SSL_R_LENGTH_TOO_SHORT);
1414                         goto f_err;
1415                         }
1416                 n2s(p,i);
1417
1418                 if (i > n - param_len)
1419                         {
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1421                         goto f_err;
1422                         }
1423                 param_len += i;
1424
1425                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1426                         {
1427                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1428                         goto err;
1429                         }
1430                 p+=i;
1431
1432
1433                 if (2 > n - param_len)
1434                         {
1435                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1436                                 SSL_R_LENGTH_TOO_SHORT);
1437                         goto f_err;
1438                         }
1439                 param_len += 2;
1440
1441                 n2s(p,i);
1442
1443                 if (i > n - param_len)
1444                         {
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1446                         goto f_err;
1447                         }
1448                 param_len += i;
1449
1450                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1451                         {
1452                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1453                         goto err;
1454                         }
1455                 p+=i;
1456
1457
1458                 if (1 > n - param_len)
1459                         {
1460                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1461                                 SSL_R_LENGTH_TOO_SHORT);
1462                         goto f_err;
1463                         }
1464                 param_len += 1;
1465
1466                 i = (unsigned int)(p[0]);
1467                 p++;
1468
1469                 if (i > n - param_len)
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1472                         goto f_err;
1473                         }
1474                 param_len += i;
1475
1476                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1477                         {
1478                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1479                         goto err;
1480                         }
1481                 p+=i;
1482
1483                 if (2 > n - param_len)
1484                         {
1485                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1486                                 SSL_R_LENGTH_TOO_SHORT);
1487                         goto f_err;
1488                         }
1489                 param_len += 2;
1490
1491                 n2s(p,i);
1492
1493                 if (i > n - param_len)
1494                         {
1495                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1496                         goto f_err;
1497                         }
1498                 param_len += i;
1499
1500                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1501                         {
1502                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1503                         goto err;
1504                         }
1505                 p+=i;
1506                 n-=param_len;
1507
1508                 if (!srp_verify_server_param(s, &al))
1509                         {
1510                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1511                         goto f_err;
1512                         }
1513
1514 /* We must check if there is a certificate */
1515 #ifndef OPENSSL_NO_RSA
1516                 if (alg_a & SSL_aRSA)
1517                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1518 #else
1519                 if (0)
1520                         ;
1521 #endif
1522 #ifndef OPENSSL_NO_DSA
1523                 else if (alg_a & SSL_aDSS)
1524                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1525 #endif
1526                 }
1527         else
1528 #endif /* !OPENSSL_NO_SRP */
1529 #ifndef OPENSSL_NO_RSA
1530         if (alg_k & SSL_kRSA)
1531                 {
1532                 if ((rsa=RSA_new()) == NULL)
1533                         {
1534                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1535                         goto err;
1536                         }
1537
1538                 param_len = 2;
1539                 if (param_len > n)
1540                         {
1541                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1542                                 SSL_R_LENGTH_TOO_SHORT);
1543                         goto f_err;
1544                         }
1545                 n2s(p,i);
1546
1547                 if (i > n - param_len)
1548                         {
1549                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1550                         goto f_err;
1551                         }
1552                 param_len += i;
1553
1554                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1555                         {
1556                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1557                         goto err;
1558                         }
1559                 p+=i;
1560
1561                 if (2 > n - param_len)
1562                         {
1563                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1564                                 SSL_R_LENGTH_TOO_SHORT);
1565                         goto f_err;
1566                         }
1567                 param_len += 2;
1568
1569                 n2s(p,i);
1570
1571                 if (i > n - param_len)
1572                         {
1573                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1574                         goto f_err;
1575                         }
1576                 param_len += i;
1577
1578                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1581                         goto err;
1582                         }
1583                 p+=i;
1584                 n-=param_len;
1585
1586                 /* this should be because we are using an export cipher */
1587                 if (alg_a & SSL_aRSA)
1588                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1589                 else
1590                         {
1591                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1592                         goto err;
1593                         }
1594                 s->session->sess_cert->peer_rsa_tmp=rsa;
1595                 rsa=NULL;
1596                 }
1597 #else /* OPENSSL_NO_RSA */
1598         if (0)
1599                 ;
1600 #endif
1601 #ifndef OPENSSL_NO_DH
1602         else if (alg_k & SSL_kEDH)
1603                 {
1604                 if ((dh=DH_new()) == NULL)
1605                         {
1606                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1607                         goto err;
1608                         }
1609
1610                 param_len = 2;
1611                 if (param_len > n)
1612                         {
1613                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1614                                 SSL_R_LENGTH_TOO_SHORT);
1615                         goto f_err;
1616                         }
1617                 n2s(p,i);
1618
1619                 if (i > n - param_len)
1620                         {
1621                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1622                         goto f_err;
1623                         }
1624                 param_len += i;
1625
1626                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1627                         {
1628                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1629                         goto err;
1630                         }
1631                 p+=i;
1632
1633                 if (2 > n - param_len)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1636                                 SSL_R_LENGTH_TOO_SHORT);
1637                         goto f_err;
1638                         }
1639                 param_len += 2;
1640
1641                 n2s(p,i);
1642
1643                 if (i > n - param_len)
1644                         {
1645                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1646                         goto f_err;
1647                         }
1648                 param_len += i;
1649
1650                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1651                         {
1652                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1653                         goto err;
1654                         }
1655                 p+=i;
1656
1657                 if (2 > n - param_len)
1658                         {
1659                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1660                                 SSL_R_LENGTH_TOO_SHORT);
1661                         goto f_err;
1662                         }
1663                 param_len += 2;
1664
1665                 n2s(p,i);
1666
1667                 if (i > n - param_len)
1668                         {
1669                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1670                         goto f_err;
1671                         }
1672                 param_len += i;
1673
1674                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1675                         {
1676                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1677                         goto err;
1678                         }
1679                 p+=i;
1680                 n-=param_len;
1681
1682 #ifndef OPENSSL_NO_RSA
1683                 if (alg_a & SSL_aRSA)
1684                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1685 #else
1686                 if (0)
1687                         ;
1688 #endif
1689 #ifndef OPENSSL_NO_DSA
1690                 else if (alg_a & SSL_aDSS)
1691                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1692 #endif
1693                 /* else anonymous DH, so no certificate or pkey. */
1694
1695                 s->session->sess_cert->peer_dh_tmp=dh;
1696                 dh=NULL;
1697                 }
1698         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1699                 {
1700                 al=SSL_AD_ILLEGAL_PARAMETER;
1701                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1702                 goto f_err;
1703                 }
1704 #endif /* !OPENSSL_NO_DH */
1705
1706 #ifndef OPENSSL_NO_ECDH
1707         else if (alg_k & SSL_kEECDH)
1708                 {
1709                 EC_GROUP *ngroup;
1710                 const EC_GROUP *group;
1711
1712                 if ((ecdh=EC_KEY_new()) == NULL)
1713                         {
1714                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1715                         goto err;
1716                         }
1717
1718                 /* Extract elliptic curve parameters and the
1719                  * server's ephemeral ECDH public key.
1720                  * Keep accumulating lengths of various components in
1721                  * param_len and make sure it never exceeds n.
1722                  */
1723
1724                 /* XXX: For now we only support named (not generic) curves
1725                  * and the ECParameters in this case is just three bytes. We
1726                  * also need one byte for the length of the encoded point
1727                  */
1728                 param_len=4;
1729                 if (param_len > n)
1730                         {
1731                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1732                                 SSL_R_LENGTH_TOO_SHORT);
1733                         goto f_err;
1734                         }
1735
1736                 if ((*p != NAMED_CURVE_TYPE) ||
1737                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1738                         {
1739                         al=SSL_AD_INTERNAL_ERROR;
1740                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1741                         goto f_err;
1742                         }
1743
1744                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1745                 if (ngroup == NULL)
1746                         {
1747                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1748                         goto err;
1749                         }
1750                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1751                         {
1752                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1753                         goto err;
1754                         }
1755                 EC_GROUP_free(ngroup);
1756
1757                 group = EC_KEY_get0_group(ecdh);
1758
1759                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1760                     (EC_GROUP_get_degree(group) > 163))
1761                         {
1762                         al=SSL_AD_EXPORT_RESTRICTION;
1763                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1764                         goto f_err;
1765                         }
1766
1767                 p+=3;
1768
1769                 /* Next, get the encoded ECPoint */
1770                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1771                     ((bn_ctx = BN_CTX_new()) == NULL))
1772                         {
1773                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1774                         goto err;
1775                         }
1776
1777                 encoded_pt_len = *p;  /* length of encoded point */
1778                 p+=1;
1779
1780                 if ((encoded_pt_len > n - param_len) ||
1781                     (EC_POINT_oct2point(group, srvr_ecpoint,
1782                         p, encoded_pt_len, bn_ctx) == 0))
1783                         {
1784                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1785                         goto f_err;
1786                         }
1787                 param_len += encoded_pt_len;
1788
1789                 n-=param_len;
1790                 p+=encoded_pt_len;
1791
1792                 /* The ECC/TLS specification does not mention
1793                  * the use of DSA to sign ECParameters in the server
1794                  * key exchange message. We do support RSA and ECDSA.
1795                  */
1796                 if (0) ;
1797 #ifndef OPENSSL_NO_RSA
1798                 else if (alg_a & SSL_aRSA)
1799                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1800 #endif
1801 #ifndef OPENSSL_NO_ECDSA
1802                 else if (alg_a & SSL_aECDSA)
1803                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1804 #endif
1805                 /* else anonymous ECDH, so no certificate or pkey. */
1806                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1807                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1808                 ecdh=NULL;
1809                 BN_CTX_free(bn_ctx);
1810                 bn_ctx = NULL;
1811                 EC_POINT_free(srvr_ecpoint);
1812                 srvr_ecpoint = NULL;
1813                 }
1814         else if (alg_k)
1815                 {
1816                 al=SSL_AD_UNEXPECTED_MESSAGE;
1817                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1818                 goto f_err;
1819                 }
1820 #endif /* !OPENSSL_NO_ECDH */
1821
1822
1823         /* p points to the next byte, there are 'n' bytes left */
1824
1825         /* if it was signed, check the signature */
1826         if (pkey != NULL)
1827                 {
1828                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1829                         {
1830                         int sigalg;
1831                         if (2 > n)
1832                                 {
1833                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1834                                         SSL_R_LENGTH_TOO_SHORT);
1835                                 goto f_err;
1836                                 }
1837
1838                         sigalg = tls12_get_sigid(pkey);
1839                         /* Should never happen */
1840                         if (sigalg == -1)
1841                                 {
1842                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1843                                 goto err;
1844                                 }
1845                         /* Check key type is consistent with signature */
1846                         if (sigalg != (int)p[1])
1847                                 {
1848                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1849                                 al=SSL_AD_DECODE_ERROR;
1850                                 goto f_err;
1851                                 }
1852                         md = tls12_get_hash(p[0]);
1853                         if (md == NULL)
1854                                 {
1855                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1856                                 goto f_err;
1857                                 }
1858 #ifdef SSL_DEBUG
1859 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1860 #endif
1861                         p += 2;
1862                         n -= 2;
1863                         }
1864                 else
1865                         md = EVP_sha1();
1866
1867                 if (2 > n)
1868                         {
1869                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1870                                 SSL_R_LENGTH_TOO_SHORT);
1871                         goto f_err;
1872                         }
1873                 n2s(p,i);
1874                 n-=2;
1875                 j=EVP_PKEY_size(pkey);
1876
1877                 /* Check signature length. If n is 0 then signature is empty */
1878                 if ((i != n) || (n > j) || (n <= 0))
1879                         {
1880                         /* wrong packet length */
1881                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1882                         goto f_err;
1883                         }
1884
1885 #ifndef OPENSSL_NO_RSA
1886                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1887                         {
1888                         int num;
1889                         unsigned int size;
1890
1891                         j=0;
1892                         q=md_buf;
1893                         for (num=2; num > 0; num--)
1894                                 {
1895                                 EVP_MD_CTX_set_flags(&md_ctx,
1896                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1897                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1898                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1899                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1900                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1901                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1902                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1903                                 q+=size;
1904                                 j+=size;
1905                                 }
1906                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1907                                                                 pkey->pkey.rsa);
1908                         if (i < 0)
1909                                 {
1910                                 al=SSL_AD_DECRYPT_ERROR;
1911                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1912                                 goto f_err;
1913                                 }
1914                         if (i == 0)
1915                                 {
1916                                 /* bad signature */
1917                                 al=SSL_AD_DECRYPT_ERROR;
1918                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1919                                 goto f_err;
1920                                 }
1921                         }
1922                 else
1923 #endif
1924                         {
1925                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1926                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1927                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1928                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1929                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1930                                 {
1931                                 /* bad signature */
1932                                 al=SSL_AD_DECRYPT_ERROR;
1933                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1934                                 goto f_err;
1935                                 }
1936                         }
1937                 }
1938         else
1939                 {
1940                 /* aNULL, aSRP or kPSK do not need public keys */
1941                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
1942                         {
1943                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1944                         goto err;
1945                         }
1946                 /* still data left over */
1947                 if (n != 0)
1948                         {
1949                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1950                         goto f_err;
1951                         }
1952                 }
1953         EVP_PKEY_free(pkey);
1954         EVP_MD_CTX_cleanup(&md_ctx);
1955         return(1);
1956 f_err:
1957         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1958 err:
1959         EVP_PKEY_free(pkey);
1960 #ifndef OPENSSL_NO_RSA
1961         if (rsa != NULL)
1962                 RSA_free(rsa);
1963 #endif
1964 #ifndef OPENSSL_NO_DH
1965         if (dh != NULL)
1966                 DH_free(dh);
1967 #endif
1968 #ifndef OPENSSL_NO_ECDH
1969         BN_CTX_free(bn_ctx);
1970         EC_POINT_free(srvr_ecpoint);
1971         if (ecdh != NULL)
1972                 EC_KEY_free(ecdh);
1973 #endif
1974         EVP_MD_CTX_cleanup(&md_ctx);
1975         return(-1);
1976         }
1977
1978 int ssl3_get_certificate_request(SSL *s)
1979         {
1980         int ok,ret=0;
1981         unsigned long n,nc,l;
1982         unsigned int llen, ctype_num,i;
1983         X509_NAME *xn=NULL;
1984         const unsigned char *p,*q;
1985         unsigned char *d;
1986         STACK_OF(X509_NAME) *ca_sk=NULL;
1987
1988         n=s->method->ssl_get_message(s,
1989                 SSL3_ST_CR_CERT_REQ_A,
1990                 SSL3_ST_CR_CERT_REQ_B,
1991                 -1,
1992                 s->max_cert_list,
1993                 &ok);
1994
1995         if (!ok) return((int)n);
1996
1997         s->s3->tmp.cert_req=0;
1998
1999         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2000                 {
2001                 s->s3->tmp.reuse_message=1;
2002                 /* If we get here we don't need any cached handshake records
2003                  * as we wont be doing client auth.
2004                  */
2005                 if (s->s3->handshake_buffer)
2006                         {
2007                         if (!ssl3_digest_cached_records(s))
2008                                 goto err;
2009                         }
2010                 return(1);
2011                 }
2012
2013         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2014                 {
2015                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2016                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2017                 goto err;
2018                 }
2019
2020         /* TLS does not like anon-DH with client cert */
2021         if (s->version > SSL3_VERSION)
2022                 {
2023                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2024                         {
2025                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2026                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2027                         goto err;
2028                         }
2029                 }
2030
2031         p=d=(unsigned char *)s->init_msg;
2032
2033         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2034                 {
2035                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2036                 goto err;
2037                 }
2038
2039         /* get the certificate types */
2040         ctype_num= *(p++);
2041         if (ctype_num > SSL3_CT_NUMBER)
2042                 ctype_num=SSL3_CT_NUMBER;
2043         for (i=0; i<ctype_num; i++)
2044                 s->s3->tmp.ctype[i]= p[i];
2045         p+=ctype_num;
2046         if (TLS1_get_version(s) >= TLS1_2_VERSION)
2047                 {
2048                 n2s(p, llen);
2049                 /* Check we have enough room for signature algorithms and
2050                  * following length value.
2051                  */
2052                 if ((unsigned long)(p - d + llen + 2) > n)
2053                         {
2054                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2055                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2056                         goto err;
2057                         }
2058                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2059                         {
2060                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2061                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2062                         goto err;
2063                         }
2064                 p += llen;
2065                 }
2066
2067         /* get the CA RDNs */
2068         n2s(p,llen);
2069 #if 0
2070 {
2071 FILE *out;
2072 out=fopen("/tmp/vsign.der","w");
2073 fwrite(p,1,llen,out);
2074 fclose(out);
2075 }
2076 #endif
2077
2078         if ((unsigned long)(p - d + llen) != n)
2079                 {
2080                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2081                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2082                 goto err;
2083                 }
2084
2085         for (nc=0; nc<llen; )
2086                 {
2087                 n2s(p,l);
2088                 if ((l+nc+2) > llen)
2089                         {
2090                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2091                                 goto cont; /* netscape bugs */
2092                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2093                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2094                         goto err;
2095                         }
2096
2097                 q=p;
2098
2099                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2100                         {
2101                         /* If netscape tolerance is on, ignore errors */
2102                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2103                                 goto cont;
2104                         else
2105                                 {
2106                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2107                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2108                                 goto err;
2109                                 }
2110                         }
2111
2112                 if (q != (p+l))
2113                         {
2114                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2115                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2116                         goto err;
2117                         }
2118                 if (!sk_X509_NAME_push(ca_sk,xn))
2119                         {
2120                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2121                         goto err;
2122                         }
2123
2124                 p+=l;
2125                 nc+=l+2;
2126                 }
2127
2128         if (0)
2129                 {
2130 cont:
2131                 ERR_clear_error();
2132                 }
2133
2134         /* we should setup a certificate to return.... */
2135         s->s3->tmp.cert_req=1;
2136         s->s3->tmp.ctype_num=ctype_num;
2137         if (s->s3->tmp.ca_names != NULL)
2138                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2139         s->s3->tmp.ca_names=ca_sk;
2140         ca_sk=NULL;
2141
2142         ret=1;
2143 err:
2144         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2145         return(ret);
2146         }
2147
2148 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2149         {
2150         return(X509_NAME_cmp(*a,*b));
2151         }
2152 #ifndef OPENSSL_NO_TLSEXT
2153 int ssl3_get_new_session_ticket(SSL *s)
2154         {
2155         int ok,al,ret=0, ticklen;
2156         long n;
2157         const unsigned char *p;
2158         unsigned char *d;
2159
2160         n=s->method->ssl_get_message(s,
2161                 SSL3_ST_CR_SESSION_TICKET_A,
2162                 SSL3_ST_CR_SESSION_TICKET_B,
2163                 -1,
2164                 16384,
2165                 &ok);
2166
2167         if (!ok)
2168                 return((int)n);
2169
2170         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2171                 {
2172                 s->s3->tmp.reuse_message=1;
2173                 return(1);
2174                 }
2175         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2176                 {
2177                 al=SSL_AD_UNEXPECTED_MESSAGE;
2178                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2179                 goto f_err;
2180                 }
2181         if (n < 6)
2182                 {
2183                 /* need at least ticket_lifetime_hint + ticket length */
2184                 al = SSL_AD_DECODE_ERROR;
2185                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2186                 goto f_err;
2187                 }
2188
2189         p=d=(unsigned char *)s->init_msg;
2190         n2l(p, s->session->tlsext_tick_lifetime_hint);
2191         n2s(p, ticklen);
2192         /* ticket_lifetime_hint + ticket_length + ticket */
2193         if (ticklen + 6 != n)
2194                 {
2195                 al = SSL_AD_DECODE_ERROR;
2196                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2197                 goto f_err;
2198                 }
2199         if (s->session->tlsext_tick)
2200                 {
2201                 OPENSSL_free(s->session->tlsext_tick);
2202                 s->session->tlsext_ticklen = 0;
2203                 }
2204         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2205         if (!s->session->tlsext_tick)
2206                 {
2207                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2208                 goto err;
2209                 }
2210         memcpy(s->session->tlsext_tick, p, ticklen);
2211         s->session->tlsext_ticklen = ticklen;
2212         /* There are two ways to detect a resumed ticket session.
2213          * One is to set an appropriate session ID and then the server
2214          * must return a match in ServerHello. This allows the normal
2215          * client session ID matching to work and we know much
2216          * earlier that the ticket has been accepted.
2217          *
2218          * The other way is to set zero length session ID when the
2219          * ticket is presented and rely on the handshake to determine
2220          * session resumption.
2221          *
2222          * We choose the former approach because this fits in with
2223          * assumptions elsewhere in OpenSSL. The session ID is set
2224          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2225          * ticket.
2226          */
2227         EVP_Digest(p, ticklen,
2228                         s->session->session_id, &s->session->session_id_length,
2229 #ifndef OPENSSL_NO_SHA256
2230                                                         EVP_sha256(), NULL);
2231 #else
2232                                                         EVP_sha1(), NULL);
2233 #endif
2234         ret=1;
2235         return(ret);
2236 f_err:
2237         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2238 err:
2239         return(-1);
2240         }
2241
2242 int ssl3_get_cert_status(SSL *s)
2243         {
2244         int ok, al;
2245         unsigned long resplen,n;
2246         const unsigned char *p;
2247
2248         n=s->method->ssl_get_message(s,
2249                 SSL3_ST_CR_CERT_STATUS_A,
2250                 SSL3_ST_CR_CERT_STATUS_B,
2251                 SSL3_MT_CERTIFICATE_STATUS,
2252                 16384,
2253                 &ok);
2254
2255         if (!ok) return((int)n);
2256         if (n < 4)
2257                 {
2258                 /* need at least status type + length */
2259                 al = SSL_AD_DECODE_ERROR;
2260                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2261                 goto f_err;
2262                 }
2263         p = (unsigned char *)s->init_msg;
2264         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2265                 {
2266                 al = SSL_AD_DECODE_ERROR;
2267                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2268                 goto f_err;
2269                 }
2270         n2l3(p, resplen);
2271         if (resplen + 4 != n)
2272                 {
2273                 al = SSL_AD_DECODE_ERROR;
2274                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2275                 goto f_err;
2276                 }
2277         if (s->tlsext_ocsp_resp)
2278                 OPENSSL_free(s->tlsext_ocsp_resp);
2279         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2280         if (!s->tlsext_ocsp_resp)
2281                 {
2282                 al = SSL_AD_INTERNAL_ERROR;
2283                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2284                 goto f_err;
2285                 }
2286         s->tlsext_ocsp_resplen = resplen;
2287         if (s->ctx->tlsext_status_cb)
2288                 {
2289                 int ret;
2290                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2291                 if (ret == 0)
2292                         {
2293                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2294                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2295                         goto f_err;
2296                         }
2297                 if (ret < 0)
2298                         {
2299                         al = SSL_AD_INTERNAL_ERROR;
2300                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2301                         goto f_err;
2302                         }
2303                 }
2304         return 1;
2305 f_err:
2306         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2307         return(-1);
2308         }
2309 #endif
2310
2311 int ssl3_get_server_done(SSL *s)
2312         {
2313         int ok,ret=0;
2314         long n;
2315
2316         n=s->method->ssl_get_message(s,
2317                 SSL3_ST_CR_SRVR_DONE_A,
2318                 SSL3_ST_CR_SRVR_DONE_B,
2319                 SSL3_MT_SERVER_DONE,
2320                 30, /* should be very small, like 0 :-) */
2321                 &ok);
2322
2323         if (!ok) return((int)n);
2324         if (n > 0)
2325                 {
2326                 /* should contain no data */
2327                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2328                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2329                 return -1;
2330                 }
2331         ret=1;
2332         return(ret);
2333         }
2334
2335
2336 int ssl3_send_client_key_exchange(SSL *s)
2337         {
2338         unsigned char *p,*d;
2339         int n;
2340         unsigned long alg_k;
2341 #ifndef OPENSSL_NO_RSA
2342         unsigned char *q;
2343         EVP_PKEY *pkey=NULL;
2344 #endif
2345 #ifndef OPENSSL_NO_KRB5
2346         KSSL_ERR kssl_err;
2347 #endif /* OPENSSL_NO_KRB5 */
2348 #ifndef OPENSSL_NO_ECDH
2349         EC_KEY *clnt_ecdh = NULL;
2350         const EC_POINT *srvr_ecpoint = NULL;
2351         EVP_PKEY *srvr_pub_pkey = NULL;
2352         unsigned char *encodedPoint = NULL;
2353         int encoded_pt_len = 0;
2354         BN_CTX * bn_ctx = NULL;
2355 #endif
2356
2357         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2358                 {
2359                 d=(unsigned char *)s->init_buf->data;
2360                 p= &(d[4]);
2361
2362                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2363
2364                 /* Fool emacs indentation */
2365                 if (0) {}
2366 #ifndef OPENSSL_NO_RSA
2367                 else if (alg_k & SSL_kRSA)
2368                         {
2369                         RSA *rsa;
2370                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2371
2372                         if (s->session->sess_cert == NULL)
2373                                 {
2374                                 /* We should always have a server certificate with SSL_kRSA. */
2375                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2376                                 goto err;
2377                                 }
2378
2379                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2380                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2381                         else
2382                                 {
2383                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2384                                 if ((pkey == NULL) ||
2385                                         (pkey->type != EVP_PKEY_RSA) ||
2386                                         (pkey->pkey.rsa == NULL))
2387                                         {
2388                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2389                                         goto err;
2390                                         }
2391                                 rsa=pkey->pkey.rsa;
2392                                 EVP_PKEY_free(pkey);
2393                                 }
2394
2395                         tmp_buf[0]=s->client_version>>8;
2396                         tmp_buf[1]=s->client_version&0xff;
2397                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2398                                         goto err;
2399
2400                         s->session->master_key_length=sizeof tmp_buf;
2401
2402                         q=p;
2403                         /* Fix buf for TLS and beyond */
2404                         if (s->version > SSL3_VERSION)
2405                                 p+=2;
2406                         n=RSA_public_encrypt(sizeof tmp_buf,
2407                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2408 #ifdef PKCS1_CHECK
2409                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2410                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2411 #endif
2412                         if (n <= 0)
2413                                 {
2414                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2415                                 goto err;
2416                                 }
2417
2418                         /* Fix buf for TLS and beyond */
2419                         if (s->version > SSL3_VERSION)
2420                                 {
2421                                 s2n(n,q);
2422                                 n+=2;
2423                                 }
2424
2425                         s->session->master_key_length=
2426                                 s->method->ssl3_enc->generate_master_secret(s,
2427                                         s->session->master_key,
2428                                         tmp_buf,sizeof tmp_buf);
2429                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2430                         }
2431 #endif
2432 #ifndef OPENSSL_NO_KRB5
2433                 else if (alg_k & SSL_kKRB5)
2434                         {
2435                         krb5_error_code krb5rc;
2436                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2437                         /*  krb5_data   krb5_ap_req;  */
2438                         krb5_data       *enc_ticket;
2439                         krb5_data       authenticator, *authp = NULL;
2440                         EVP_CIPHER_CTX  ciph_ctx;
2441                         const EVP_CIPHER *enc = NULL;
2442                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2443                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2444                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2445                                                 + EVP_MAX_IV_LENGTH];
2446                         int             padl, outl = sizeof(epms);
2447
2448                         EVP_CIPHER_CTX_init(&ciph_ctx);
2449
2450 #ifdef KSSL_DEBUG
2451                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2452                                 alg_k, SSL_kKRB5);
2453 #endif  /* KSSL_DEBUG */
2454
2455                         authp = NULL;
2456 #ifdef KRB5SENDAUTH
2457                         if (KRB5SENDAUTH)  authp = &authenticator;
2458 #endif  /* KRB5SENDAUTH */
2459
2460                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2461                                 &kssl_err);
2462                         enc = kssl_map_enc(kssl_ctx->enctype);
2463                         if (enc == NULL)
2464                             goto err;
2465 #ifdef KSSL_DEBUG
2466                         {
2467                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2468                         if (krb5rc && kssl_err.text)
2469                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2470                         }
2471 #endif  /* KSSL_DEBUG */
2472
2473                         if (krb5rc)
2474                                 {
2475                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2476                                                 SSL_AD_HANDSHAKE_FAILURE);
2477                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2478                                                 kssl_err.reason);
2479                                 goto err;
2480                                 }
2481
2482                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2483                         **  in place of RFC 2712 KerberosWrapper, as in:
2484                         **
2485                         **  Send ticket (copy to *p, set n = length)
2486                         **  n = krb5_ap_req.length;
2487                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2488                         **  if (krb5_ap_req.data)
2489                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2490                         **
2491                         **  Now using real RFC 2712 KerberosWrapper
2492                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2493                         **  Note: 2712 "opaque" types are here replaced
2494                         **  with a 2-byte length followed by the value.
2495                         **  Example:
2496                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2497                         **  Where "xx xx" = length bytes.  Shown here with
2498                         **  optional authenticator omitted.
2499                         */
2500
2501                         /*  KerberosWrapper.Ticket              */
2502                         s2n(enc_ticket->length,p);
2503                         memcpy(p, enc_ticket->data, enc_ticket->length);
2504                         p+= enc_ticket->length;
2505                         n = enc_ticket->length + 2;
2506
2507                         /*  KerberosWrapper.Authenticator       */
2508                         if (authp  &&  authp->length)
2509                                 {
2510                                 s2n(authp->length,p);
2511                                 memcpy(p, authp->data, authp->length);
2512                                 p+= authp->length;
2513                                 n+= authp->length + 2;
2514
2515                                 free(authp->data);
2516                                 authp->data = NULL;
2517                                 authp->length = 0;
2518                                 }
2519                         else
2520                                 {
2521                                 s2n(0,p);/*  null authenticator length  */
2522                                 n+=2;
2523                                 }
2524
2525                             tmp_buf[0]=s->client_version>>8;
2526                             tmp_buf[1]=s->client_version&0xff;
2527                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2528                                 goto err;
2529
2530                         /*  20010420 VRS.  Tried it this way; failed.
2531                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2532                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2533                         **                              kssl_ctx->length);
2534                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2535                         */
2536
2537                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2538                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2539                                 kssl_ctx->key,iv);
2540                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2541                                 sizeof tmp_buf);
2542                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2543                         outl += padl;
2544                         if (outl > (int)sizeof epms)
2545                                 {
2546                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2547                                 goto err;
2548                                 }
2549                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2550
2551                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2552                         s2n(outl,p);
2553                         memcpy(p, epms, outl);
2554                         p+=outl;
2555                         n+=outl + 2;
2556
2557                         s->session->master_key_length=
2558                                 s->method->ssl3_enc->generate_master_secret(s,
2559                                         s->session->master_key,
2560                                         tmp_buf, sizeof tmp_buf);
2561
2562                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2563                         OPENSSL_cleanse(epms, outl);
2564                         }
2565 #endif
2566 #ifndef OPENSSL_NO_DH
2567                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2568                         {
2569                         DH *dh_srvr,*dh_clnt;
2570
2571                         if (s->session->sess_cert == NULL)
2572                                 {
2573                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2574                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2575                                 goto err;
2576                                 }
2577
2578                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2579                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2580                         else
2581                                 {
2582                                 /* we get them from the cert */
2583                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2584                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2585                                 goto err;
2586                                 }
2587
2588                         /* generate a new random key */
2589                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2590                                 {
2591                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2592                                 goto err;
2593                                 }
2594                         if (!DH_generate_key(dh_clnt))
2595                                 {
2596                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2597                                 DH_free(dh_clnt);
2598                                 goto err;
2599                                 }
2600
2601                         /* use the 'p' output buffer for the DH key, but
2602                          * make sure to clear it out afterwards */
2603
2604                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2605
2606                         if (n <= 0)
2607                                 {
2608                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2609                                 DH_free(dh_clnt);
2610                                 goto err;
2611                                 }
2612
2613                         /* generate master key from the result */
2614                         s->session->master_key_length=
2615                                 s->method->ssl3_enc->generate_master_secret(s,
2616                                         s->session->master_key,p,n);
2617                         /* clean up */
2618                         memset(p,0,n);
2619
2620                         /* send off the data */
2621                         n=BN_num_bytes(dh_clnt->pub_key);
2622                         s2n(n,p);
2623                         BN_bn2bin(dh_clnt->pub_key,p);
2624                         n+=2;
2625
2626                         DH_free(dh_clnt);
2627
2628                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2629                         }
2630 #endif
2631
2632 #ifndef OPENSSL_NO_ECDH
2633                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2634                         {
2635                         const EC_GROUP *srvr_group = NULL;
2636                         EC_KEY *tkey;
2637                         int ecdh_clnt_cert = 0;
2638                         int field_size = 0;
2639
2640                         if (s->session->sess_cert == NULL)
2641                                 {
2642                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2643                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2644                                 goto err;
2645                                 }
2646
2647                         /* Did we send out the client's
2648                          * ECDH share for use in premaster
2649                          * computation as part of client certificate?
2650                          * If so, set ecdh_clnt_cert to 1.
2651                          */
2652                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2653                                 {
2654                                 /* XXX: For now, we do not support client
2655                                  * authentication using ECDH certificates.
2656                                  * To add such support, one needs to add
2657                                  * code that checks for appropriate
2658                                  * conditions and sets ecdh_clnt_cert to 1.
2659                                  * For example, the cert have an ECC
2660                                  * key on the same curve as the server's
2661                                  * and the key should be authorized for
2662                                  * key agreement.
2663                                  *
2664                                  * One also needs to add code in ssl3_connect
2665                                  * to skip sending the certificate verify
2666                                  * message.
2667                                  *
2668                                  * if ((s->cert->key->privatekey != NULL) &&
2669                                  *     (s->cert->key->privatekey->type ==
2670                                  *      EVP_PKEY_EC) && ...)
2671                                  * ecdh_clnt_cert = 1;
2672                                  */
2673                                 }
2674
2675                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2676                                 {
2677                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2678                                 }
2679                         else
2680                                 {
2681                                 /* Get the Server Public Key from Cert */
2682                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2683                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2684                                 if ((srvr_pub_pkey == NULL) ||
2685                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2686                                     (srvr_pub_pkey->pkey.ec == NULL))
2687                                         {
2688                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2689                                             ERR_R_INTERNAL_ERROR);
2690                                         goto err;
2691                                         }
2692
2693                                 tkey = srvr_pub_pkey->pkey.ec;
2694                                 }
2695
2696                         srvr_group   = EC_KEY_get0_group(tkey);
2697                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2698
2699                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2700                                 {
2701                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2702                                     ERR_R_INTERNAL_ERROR);
2703                                 goto err;
2704                                 }
2705
2706                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2707                                 {
2708                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2709                                 goto err;
2710                                 }
2711
2712                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2713                                 {
2714                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2715                                 goto err;
2716                                 }
2717                         if (ecdh_clnt_cert)
2718                                 {
2719                                 /* Reuse key info from our certificate
2720                                  * We only need our private key to perform
2721                                  * the ECDH computation.
2722                                  */
2723                                 const BIGNUM *priv_key;
2724                                 tkey = s->cert->key->privatekey->pkey.ec;
2725                                 priv_key = EC_KEY_get0_private_key(tkey);
2726                                 if (priv_key == NULL)
2727                                         {
2728                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2729                                         goto err;
2730                                         }
2731                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2732                                         {
2733                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2734                                         goto err;
2735                                         }
2736                                 }
2737                         else
2738                                 {
2739                                 /* Generate a new ECDH key pair */
2740                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2741                                         {
2742                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2743                                         goto err;
2744                                         }
2745                                 }
2746
2747                         /* use the 'p' output buffer for the ECDH key, but
2748                          * make sure to clear it out afterwards
2749                          */
2750
2751                         field_size = EC_GROUP_get_degree(srvr_group);
2752                         if (field_size <= 0)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2755                                        ERR_R_ECDH_LIB);
2756                                 goto err;
2757                                 }
2758                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2759                         if (n <= 0)
2760                                 {
2761                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2762                                        ERR_R_ECDH_LIB);
2763                                 goto err;
2764                                 }
2765
2766                         /* generate master key from the result */
2767                         s->session->master_key_length = s->method->ssl3_enc \
2768                             -> generate_master_secret(s,
2769                                 s->session->master_key,
2770                                 p, n);
2771
2772                         memset(p, 0, n); /* clean up */
2773
2774                         if (ecdh_clnt_cert)
2775                                 {
2776                                 /* Send empty client key exch message */
2777                                 n = 0;
2778                                 }
2779                         else
2780                                 {
2781                                 /* First check the size of encoding and
2782                                  * allocate memory accordingly.
2783                                  */
2784                                 encoded_pt_len =
2785                                     EC_POINT_point2oct(srvr_group,
2786                                         EC_KEY_get0_public_key(clnt_ecdh),
2787                                         POINT_CONVERSION_UNCOMPRESSED,
2788                                         NULL, 0, NULL);
2789
2790                                 encodedPoint = (unsigned char *)
2791                                     OPENSSL_malloc(encoded_pt_len *
2792                                         sizeof(unsigned char));
2793                                 bn_ctx = BN_CTX_new();
2794                                 if ((encodedPoint == NULL) ||
2795                                     (bn_ctx == NULL))
2796                                         {
2797                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2798                                         goto err;
2799                                         }
2800
2801                                 /* Encode the public key */
2802                                 n = EC_POINT_point2oct(srvr_group,
2803                                     EC_KEY_get0_public_key(clnt_ecdh),
2804                                     POINT_CONVERSION_UNCOMPRESSED,
2805                                     encodedPoint, encoded_pt_len, bn_ctx);
2806
2807                                 *p = n; /* length of encoded point */
2808                                 /* Encoded point will be copied here */
2809                                 p += 1;
2810                                 /* copy the point */
2811                                 memcpy((unsigned char *)p, encodedPoint, n);
2812                                 /* increment n to account for length field */
2813                                 n += 1;
2814                                 }
2815
2816                         /* Free allocated memory */
2817                         BN_CTX_free(bn_ctx);
2818                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2819                         if (clnt_ecdh != NULL)
2820                                  EC_KEY_free(clnt_ecdh);
2821                         EVP_PKEY_free(srvr_pub_pkey);
2822                         }
2823 #endif /* !OPENSSL_NO_ECDH */
2824                 else if (alg_k & SSL_kGOST)
2825                         {
2826                         /* GOST key exchange message creation */
2827                         EVP_PKEY_CTX *pkey_ctx;
2828                         X509 *peer_cert;
2829                         size_t msglen;
2830                         unsigned int md_len;
2831                         int keytype;
2832                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2833                         EVP_MD_CTX *ukm_hash;
2834                         EVP_PKEY *pub_key;
2835
2836                         /* Get server sertificate PKEY and create ctx from it */
2837                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2838                         if (!peer_cert)
2839                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2840                         if (!peer_cert)         {
2841                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2842                                         goto err;
2843                                 }
2844
2845                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2846                         /* If we have send a certificate, and certificate key
2847
2848                          * parameters match those of server certificate, use
2849                          * certificate key for key exchange
2850                          */
2851
2852                          /* Otherwise, generate ephemeral key pair */
2853
2854                         EVP_PKEY_encrypt_init(pkey_ctx);
2855                           /* Generate session key */
2856                     RAND_bytes(premaster_secret,32);
2857                         /* If we have client certificate, use its secret as peer key */
2858                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2859                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2860                                         /* If there was an error - just ignore it. Ephemeral key
2861                                         * would be used
2862                                         */
2863                                         ERR_clear_error();
2864                                 }
2865                         }
2866                         /* Compute shared IV and store it in algorithm-specific
2867                          * context data */
2868                         ukm_hash = EVP_MD_CTX_create();
2869                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2870                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2871                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2872                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2873                         EVP_MD_CTX_destroy(ukm_hash);
2874                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2875                                 8,shared_ukm)<0) {
2876                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2877                                                 SSL_R_LIBRARY_BUG);
2878                                         goto err;
2879                                 }
2880                         /* Make GOST keytransport blob message */
2881                         /*Encapsulate it into sequence */
2882                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2883                         msglen=255;
2884                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2885                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2886                                         SSL_R_LIBRARY_BUG);
2887                                 goto err;
2888                         }
2889                         if (msglen >= 0x80)
2890                                 {
2891                                 *(p++)=0x81;
2892                                 *(p++)= msglen & 0xff;
2893                                 n=msglen+3;
2894                                 }
2895                         else
2896                                 {
2897                                 *(p++)= msglen & 0xff;
2898                                 n=msglen+2;
2899                                 }
2900                         memcpy(p, tmp, msglen);
2901                         /* Check if pubkey from client certificate was used */
2902                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2903                                 {
2904                                 /* Set flag "skip certificate verify" */
2905                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2906                                 }
2907                         EVP_PKEY_CTX_free(pkey_ctx);
2908                         s->session->master_key_length=
2909                                 s->method->ssl3_enc->generate_master_secret(s,
2910                                         s->session->master_key,premaster_secret,32);
2911                         EVP_PKEY_free(pub_key);
2912
2913                         }
2914 #ifndef OPENSSL_NO_SRP
2915                 else if (alg_k & SSL_kSRP)
2916                         {
2917                         if (s->srp_ctx.A != NULL)
2918                                 {
2919                                 /* send off the data */
2920                                 n=BN_num_bytes(s->srp_ctx.A);
2921                                 s2n(n,p);
2922                                 BN_bn2bin(s->srp_ctx.A,p);
2923                                 n+=2;
2924                                 }
2925                         else
2926                                 {
2927                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2928                                 goto err;
2929                                 }
2930                         if (s->session->srp_username != NULL)
2931                                 OPENSSL_free(s->session->srp_username);
2932                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2933                         if (s->session->srp_username == NULL)
2934                                 {
2935                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2936                                         ERR_R_MALLOC_FAILURE);
2937                                 goto err;
2938                                 }
2939
2940                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2941                                 {
2942                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2943                                 goto err;
2944                                 }
2945                         }
2946 #endif
2947 #ifndef OPENSSL_NO_PSK
2948                 else if (alg_k & SSL_kPSK)
2949                         {
2950                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
2951                          * to return a \0-terminated identity. The last byte
2952                          * is for us for simulating strnlen. */
2953                         char identity[PSK_MAX_IDENTITY_LEN + 2];
2954                         size_t identity_len;
2955                         unsigned char *t = NULL;
2956                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2957                         unsigned int pre_ms_len = 0, psk_len = 0;
2958                         int psk_err = 1;
2959
2960                         n = 0;
2961                         if (s->psk_client_callback == NULL)
2962                                 {
2963                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2964                                         SSL_R_PSK_NO_CLIENT_CB);
2965                                 goto err;
2966                                 }
2967
2968                         memset(identity, 0, sizeof(identity));
2969                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2970                                 identity, sizeof(identity) - 1,
2971                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2972                         if (psk_len > PSK_MAX_PSK_LEN)
2973                                 {
2974                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2975                                         ERR_R_INTERNAL_ERROR);
2976                                 goto psk_err;
2977                                 }
2978                         else if (psk_len == 0)
2979                                 {
2980                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2981                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2982                                 goto psk_err;
2983                                 }
2984                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
2985                         identity_len = strlen(identity);
2986                         if (identity_len > PSK_MAX_IDENTITY_LEN)
2987                                 {
2988                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2989                                         ERR_R_INTERNAL_ERROR);
2990                                 goto psk_err;
2991                                 }
2992                         /* create PSK pre_master_secret */
2993                         pre_ms_len = 2+psk_len+2+psk_len;
2994                         t = psk_or_pre_ms;
2995                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2996                         s2n(psk_len, t);
2997                         memset(t, 0, psk_len);
2998                         t+=psk_len;
2999                         s2n(psk_len, t);
3000
3001                         if (s->session->psk_identity_hint != NULL)
3002                                 OPENSSL_free(s->session->psk_identity_hint);
3003                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3004                         if (s->ctx->psk_identity_hint != NULL &&
3005                                 s->session->psk_identity_hint == NULL)
3006                                 {
3007                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3008                                         ERR_R_MALLOC_FAILURE);
3009                                 goto psk_err;
3010                                 }
3011
3012                         if (s->session->psk_identity != NULL)
3013                                 OPENSSL_free(s->session->psk_identity);
3014                         s->session->psk_identity = BUF_strdup(identity);
3015                         if (s->session->psk_identity == NULL)
3016                                 {
3017                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3018                                         ERR_R_MALLOC_FAILURE);
3019                                 goto psk_err;
3020                                 }
3021
3022                         s->session->master_key_length =
3023                                 s->method->ssl3_enc->generate_master_secret(s,
3024                                         s->session->master_key,
3025                                         psk_or_pre_ms, pre_ms_len);
3026                         s2n(identity_len, p);
3027                         memcpy(p, identity, identity_len);
3028                         n = 2 + identity_len;
3029                         psk_err = 0;
3030                 psk_err:
3031                         OPENSSL_cleanse(identity, sizeof(identity));
3032                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3033                         if (psk_err != 0)
3034                                 {
3035                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3036                                 goto err;
3037                                 }
3038                         }
3039 #endif
3040                 else
3041                         {
3042                         ssl3_send_alert(s, SSL3_AL_FATAL,
3043                             SSL_AD_HANDSHAKE_FAILURE);
3044                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3045                             ERR_R_INTERNAL_ERROR);
3046                         goto err;
3047                         }
3048
3049                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
3050                 l2n3(n,d);
3051
3052                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3053                 /* number of bytes to write */
3054                 s->init_num=n+4;
3055                 s->init_off=0;
3056                 }
3057
3058         /* SSL3_ST_CW_KEY_EXCH_B */
3059         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3060 err:
3061 #ifndef OPENSSL_NO_ECDH
3062         BN_CTX_free(bn_ctx);
3063         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3064         if (clnt_ecdh != NULL)
3065                 EC_KEY_free(clnt_ecdh);
3066         EVP_PKEY_free(srvr_pub_pkey);
3067 #endif
3068         return(-1);
3069         }
3070
3071 int ssl3_send_client_verify(SSL *s)
3072         {
3073         unsigned char *p,*d;
3074         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3075         EVP_PKEY *pkey;
3076         EVP_PKEY_CTX *pctx=NULL;
3077         EVP_MD_CTX mctx;
3078         unsigned u=0;
3079         unsigned long n;
3080         int j;
3081
3082         EVP_MD_CTX_init(&mctx);
3083
3084         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3085                 {
3086                 d=(unsigned char *)s->init_buf->data;
3087                 p= &(d[4]);
3088                 pkey=s->cert->key->privatekey;
3089 /* Create context from key and test if sha1 is allowed as digest */
3090                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3091                 EVP_PKEY_sign_init(pctx);
3092                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3093                         {
3094                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3095                                 s->method->ssl3_enc->cert_verify_mac(s,
3096                                                 NID_sha1,
3097                                                 &(data[MD5_DIGEST_LENGTH]));
3098                         }
3099                 else
3100                         {
3101                         ERR_clear_error();
3102                         }
3103                 /* For TLS v1.2 send signature algorithm and signature
3104                  * using agreed digest and cached handshake records.
3105                  */
3106                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3107                         {
3108                         long hdatalen = 0;
3109                         void *hdata;
3110                         const EVP_MD *md = s->cert->key->digest;
3111                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3112                                                                 &hdata);
3113                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3114                                 {
3115                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3116                                                 ERR_R_INTERNAL_ERROR);
3117                                 goto err;
3118                                 }
3119                         p += 2;
3120 #ifdef SSL_DEBUG
3121                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3122                                                         EVP_MD_name(md));
3123 #endif
3124                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3125                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3126                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3127                                 {
3128                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3129                                                 ERR_R_EVP_LIB);
3130                                 goto err;
3131                                 }
3132                         s2n(u,p);
3133                         n = u + 4;
3134                         if (!ssl3_digest_cached_records(s))
3135                                 goto err;
3136                         }
3137                 else
3138 #ifndef OPENSSL_NO_RSA
3139                 if (pkey->type == EVP_PKEY_RSA)
3140                         {
3141                         s->method->ssl3_enc->cert_verify_mac(s,
3142                                 NID_md5,
3143                                 &(data[0]));
3144                         if (RSA_sign(NID_md5_sha1, data,
3145                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3146                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3147                                 {
3148                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3149                                 goto err;
3150                                 }
3151                         s2n(u,p);
3152                         n=u+2;
3153                         }
3154                 else
3155 #endif
3156 #ifndef OPENSSL_NO_DSA
3157                         if (pkey->type == EVP_PKEY_DSA)
3158                         {
3159                         if (!DSA_sign(pkey->save_type,
3160                                 &(data[MD5_DIGEST_LENGTH]),
3161                                 SHA_DIGEST_LENGTH,&(p[2]),
3162                                 (unsigned int *)&j,pkey->pkey.dsa))
3163                                 {
3164                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3165                                 goto err;
3166                                 }
3167                         s2n(j,p);
3168                         n=j+2;
3169                         }
3170                 else
3171 #endif
3172 #ifndef OPENSSL_NO_ECDSA
3173                         if (pkey->type == EVP_PKEY_EC)
3174                         {
3175                         if (!ECDSA_sign(pkey->save_type,
3176                                 &(data[MD5_DIGEST_LENGTH]),
3177                                 SHA_DIGEST_LENGTH,&(p[2]),
3178                                 (unsigned int *)&j,pkey->pkey.ec))
3179                                 {
3180                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3181                                     ERR_R_ECDSA_LIB);
3182                                 goto err;
3183                                 }
3184                         s2n(j,p);
3185                         n=j+2;
3186                         }
3187                 else
3188 #endif
3189                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3190                 {
3191                 unsigned char signbuf[64];
3192                 int i;
3193                 size_t sigsize=64;
3194                 s->method->ssl3_enc->cert_verify_mac(s,
3195                         NID_id_GostR3411_94,
3196                         data);
3197                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3198                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3199                         ERR_R_INTERNAL_ERROR);
3200                         goto err;
3201                 }
3202                 for (i=63,j=0; i>=0; j++, i--) {
3203                         p[2+j]=signbuf[i];
3204                 }
3205                 s2n(j,p);
3206                 n=j+2;
3207                 }
3208                 else
3209                 {
3210                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3211                         goto err;
3212                 }
3213                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3214                 l2n3(n,d);
3215
3216                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3217                 s->init_num=(int)n+4;
3218                 s->init_off=0;
3219                 }
3220         EVP_MD_CTX_cleanup(&mctx);
3221         EVP_PKEY_CTX_free(pctx);
3222         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3223 err:
3224         EVP_MD_CTX_cleanup(&mctx);
3225         EVP_PKEY_CTX_free(pctx);
3226         return(-1);
3227         }
3228
3229 int ssl3_send_client_certificate(SSL *s)
3230         {
3231         X509 *x509=NULL;
3232         EVP_PKEY *pkey=NULL;
3233         int i;
3234         unsigned long l;
3235
3236         if (s->state == SSL3_ST_CW_CERT_A)
3237                 {
3238                 if ((s->cert == NULL) ||
3239                         (s->cert->key->x509 == NULL) ||
3240                         (s->cert->key->privatekey == NULL))
3241                         s->state=SSL3_ST_CW_CERT_B;
3242                 else
3243                         s->state=SSL3_ST_CW_CERT_C;
3244                 }
3245
3246         /* We need to get a client cert */
3247         if (s->state == SSL3_ST_CW_CERT_B)
3248                 {
3249                 /* If we get an error, we need to
3250                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3251                  * We then get retied later */
3252                 i=0;
3253                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3254                 if (i < 0)
3255                         {
3256                         s->rwstate=SSL_X509_LOOKUP;
3257                         return(-1);
3258                         }
3259                 s->rwstate=SSL_NOTHING;
3260                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3261                         {
3262                         s->state=SSL3_ST_CW_CERT_B;
3263                         if (    !SSL_use_certificate(s,x509) ||
3264                                 !SSL_use_PrivateKey(s,pkey))
3265                                 i=0;
3266                         }
3267                 else if (i == 1)
3268                         {
3269                         i=0;
3270                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3271                         }
3272
3273                 if (x509 != NULL) X509_free(x509);
3274                 if (pkey != NULL) EVP_PKEY_free(pkey);
3275                 if (i == 0)
3276                         {
3277                         if (s->version == SSL3_VERSION)
3278                                 {
3279                                 s->s3->tmp.cert_req=0;
3280                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3281                                 return(1);
3282                                 }
3283                         else
3284                                 {
3285                                 s->s3->tmp.cert_req=2;
3286                                 }
3287                         }
3288
3289                 /* Ok, we have a cert */
3290                 s->state=SSL3_ST_CW_CERT_C;
3291                 }
3292
3293         if (s->state == SSL3_ST_CW_CERT_C)
3294                 {
3295                 s->state=SSL3_ST_CW_CERT_D;
3296                 l=ssl3_output_cert_chain(s,
3297                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3298                 s->init_num=(int)l;
3299                 s->init_off=0;
3300                 }
3301         /* SSL3_ST_CW_CERT_D */
3302         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3303         }
3304
3305 #define has_bits(i,m)   (((i)&(m)) == (m))
3306
3307 int ssl3_check_cert_and_algorithm(SSL *s)
3308         {
3309         int i,idx;
3310         long alg_k,alg_a;
3311         EVP_PKEY *pkey=NULL;
3312         SESS_CERT *sc;
3313 #ifndef OPENSSL_NO_RSA
3314         RSA *rsa;
3315 #endif
3316 #ifndef OPENSSL_NO_DH
3317         DH *dh;
3318 #endif
3319
3320         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3321         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3322
3323         /* we don't have a certificate */
3324         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3325                 return(1);
3326
3327         sc=s->session->sess_cert;
3328         if (sc == NULL)
3329                 {
3330                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3331                 goto err;
3332                 }
3333
3334 #ifndef OPENSSL_NO_RSA
3335         rsa=s->session->sess_cert->peer_rsa_tmp;
3336 #endif
3337 #ifndef OPENSSL_NO_DH
3338         dh=s->session->sess_cert->peer_dh_tmp;
3339 #endif
3340
3341         /* This is the passed certificate */
3342
3343         idx=sc->peer_cert_type;
3344 #ifndef OPENSSL_NO_ECDH
3345         if (idx == SSL_PKEY_ECC)
3346                 {
3347                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3348                                                                 s) == 0)
3349                         { /* check failed */
3350                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3351                         goto f_err;
3352                         }
3353                 else
3354                         {
3355                         return 1;
3356                         }
3357                 }
3358 #endif
3359         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3360         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3361         EVP_PKEY_free(pkey);
3362
3363
3364         /* Check that we have a certificate if we require one */
3365         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3366                 {
3367                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3368                 goto f_err;
3369                 }
3370 #ifndef OPENSSL_NO_DSA
3371         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3372                 {
3373                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3374                 goto f_err;
3375                 }
3376 #endif
3377 #ifndef OPENSSL_NO_RSA
3378         if ((alg_k & SSL_kRSA) &&
3379                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3380                 {
3381                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3382                 goto f_err;
3383                 }
3384 #endif
3385 #ifndef OPENSSL_NO_DH
3386         if ((alg_k & SSL_kEDH) &&
3387                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3388                 {
3389                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3390                 goto f_err;
3391                 }
3392         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3393                 {
3394                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3395                 goto f_err;
3396                 }
3397 #ifndef OPENSSL_NO_DSA
3398         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3399                 {
3400                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3401                 goto f_err;
3402                 }
3403 #endif
3404 #endif
3405
3406         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3407                 {
3408 #ifndef OPENSSL_NO_RSA
3409                 if (alg_k & SSL_kRSA)
3410                         {
3411                         if (rsa == NULL
3412                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3413                                 {
3414                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3415                                 goto f_err;
3416                                 }
3417                         }
3418                 else
3419 #endif
3420 #ifndef OPENSSL_NO_DH
3421                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3422                             {
3423                             if (dh == NULL
3424                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3425                                 {
3426                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3427                                 goto f_err;
3428                                 }
3429                         }
3430                 else
3431 #endif
3432                         {
3433                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3434                         goto f_err;
3435                         }
3436                 }
3437         return(1);
3438 f_err:
3439         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3440 err:
3441         return(0);
3442         }
3443
3444 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3445 int ssl3_send_next_proto(SSL *s)
3446         {
3447         unsigned int len, padding_len;
3448         unsigned char *d;
3449
3450         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3451                 {
3452                 len = s->next_proto_negotiated_len;
3453                 padding_len = 32 - ((len + 2) % 32);
3454                 d = (unsigned char *)s->init_buf->data;
3455                 d[4] = len;
3456                 memcpy(d + 5, s->next_proto_negotiated, len);
3457                 d[5 + len] = padding_len;
3458                 memset(d + 6 + len, 0, padding_len);
3459                 *(d++)=SSL3_MT_NEXT_PROTO;
3460                 l2n3(2 + len + padding_len, d);
3461                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3462                 s->init_num = 4 + 2 + len + padding_len;
3463                 s->init_off = 0;
3464                 }
3465
3466         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3467         }
3468 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3469
3470 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3471         {
3472         int i = 0;
3473 #ifndef OPENSSL_NO_ENGINE
3474         if (s->ctx->client_cert_engine)
3475                 {
3476                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3477                                                 SSL_get_client_CA_list(s),
3478                                                 px509, ppkey, NULL, NULL, NULL);
3479                 if (i != 0)
3480                         return i;
3481                 }
3482 #endif
3483         if (s->ctx->client_cert_cb)
3484                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3485         return i;
3486         }