crypto/openssl/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 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static const SSL_METHOD *ssl3_get_client_method(int ver);
 168 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182
 183 int ssl3_connect(SSL *s)
 184         {
 185         BUF_MEM *buf=NULL;
 186         unsigned long Time=(unsigned long)time(NULL);
 187         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 188         int ret= -1;
 189         int new_state,state,skip=0;
 190
 191         RAND_add(&Time,sizeof(Time),0);
 192         ERR_clear_error();
 193         clear_sys_error();
 194
 195         if (s->info_callback != NULL)
 196                 cb=s->info_callback;
 197         else if (s->ctx->info_callback != NULL)
 198                 cb=s->ctx->info_callback;
 199
 200         s->in_handshake++;
 201         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 202
 203         for (;;)
 204                 {
 205                 state=s->state;
 206
 207                 switch(s->state)
 208                         {
 209                 case SSL_ST_RENEGOTIATE:
 210                         s->new_session=1;
 211                         s->state=SSL_ST_CONNECT;
 212                         s->ctx->stats.sess_connect_renegotiate++;
 213                         /* break */
 214                 case SSL_ST_BEFORE:
 215                 case SSL_ST_CONNECT:
 216                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 217                 case SSL_ST_OK|SSL_ST_CONNECT:
 218
 219                         s->server=0;
 220                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 221
 222                         if ((s->version & 0xff00 ) != 0x0300)
 223                                 {
 224                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 225                                 ret = -1;
 226                                 goto end;
 227                                 }
 228
 229                         /* s->version=SSL3_VERSION; */
 230                         s->type=SSL_ST_CONNECT;
 231
 232                         if (s->init_buf == NULL)
 233                                 {
 234                                 if ((buf=BUF_MEM_new()) == NULL)
 235                                         {
 236                                         ret= -1;
 237                                         goto end;
 238                                         }
 239                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 240                                         {
 241                                         ret= -1;
 242                                         goto end;
 243                                         }
 244                                 s->init_buf=buf;
 245                                 buf=NULL;
 246                                 }
 247
 248                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 249
 250                         /* setup buffing BIO */
 251                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 252
 253                         /* don't push the buffering BIO quite yet */
 254
 255                         ssl3_init_finished_mac(s);
 256
 257                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 258                         s->ctx->stats.sess_connect++;
 259                         s->init_num=0;
 260                         break;
 261
 262                 case SSL3_ST_CW_CLNT_HELLO_A:
 263                 case SSL3_ST_CW_CLNT_HELLO_B:
 264
 265                         s->shutdown=0;
 266                         ret=ssl3_client_hello(s);
 267                         if (ret <= 0) goto end;
 268                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 269                         s->init_num=0;
 270
 271                         /* turn on buffering for the next lot of output */
 272                         if (s->bbio != s->wbio)
 273                                 s->wbio=BIO_push(s->bbio,s->wbio);
 274
 275                         break;
 276
 277                 case SSL3_ST_CR_SRVR_HELLO_A:
 278                 case SSL3_ST_CR_SRVR_HELLO_B:
 279                         ret=ssl3_get_server_hello(s);
 280                         if (ret <= 0) goto end;
 281
 282                         if (s->hit)
 283                                 s->state=SSL3_ST_CR_FINISHED_A;
 284                         else
 285                                 s->state=SSL3_ST_CR_CERT_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_CR_CERT_A:
 290                 case SSL3_ST_CR_CERT_B:
 291 #ifndef OPENSSL_NO_TLSEXT
 292                         ret=ssl3_check_finished(s);
 293                         if (ret <= 0) goto end;
 294                         if (ret == 2)
 295                                 {
 296                                 s->hit = 1;
 297                                 if (s->tlsext_ticket_expected)
 298                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 299                                 else
 300                                         s->state=SSL3_ST_CR_FINISHED_A;
 301                                 s->init_num=0;
 302                                 break;
 303                                 }
 304 #endif
 305                         /* Check if it is anon DH/ECDH */
 306                         /* or PSK */
 307                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 308                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 309                                 {
 310                                 ret=ssl3_get_server_certificate(s);
 311                                 if (ret <= 0) goto end;
 312 #ifndef OPENSSL_NO_TLSEXT
 313                                 if (s->tlsext_status_expected)
 314                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 315                                 else
 316                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 317                                 }
 318                         else
 319                                 {
 320                                 skip = 1;
 321                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 322                                 }
 323 #else
 324                                 }
 325                         else
 326                                 skip=1;
 327
 328                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 329 #endif
 330                         s->init_num=0;
 331                         break;
 332
 333                 case SSL3_ST_CR_KEY_EXCH_A:
 334                 case SSL3_ST_CR_KEY_EXCH_B:
 335                         ret=ssl3_get_key_exchange(s);
 336                         if (ret <= 0) goto end;
 337                         s->state=SSL3_ST_CR_CERT_REQ_A;
 338                         s->init_num=0;
 339
 340                         /* at this point we check that we have the
 341                          * required stuff from the server */
 342                         if (!ssl3_check_cert_and_algorithm(s))
 343                                 {
 344                                 ret= -1;
 345                                 goto end;
 346                                 }
 347                         break;
 348
 349                 case SSL3_ST_CR_CERT_REQ_A:
 350                 case SSL3_ST_CR_CERT_REQ_B:
 351                         ret=ssl3_get_certificate_request(s);
 352                         if (ret <= 0) goto end;
 353                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_SRVR_DONE_A:
 358                 case SSL3_ST_CR_SRVR_DONE_B:
 359                         ret=ssl3_get_server_done(s);
 360                         if (ret <= 0) goto end;
 361                         if (s->s3->tmp.cert_req)
 362                                 s->state=SSL3_ST_CW_CERT_A;
 363                         else
 364                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 365                         s->init_num=0;
 366
 367                         break;
 368
 369                 case SSL3_ST_CW_CERT_A:
 370                 case SSL3_ST_CW_CERT_B:
 371                 case SSL3_ST_CW_CERT_C:
 372                 case SSL3_ST_CW_CERT_D:
 373                         ret=ssl3_send_client_certificate(s);
 374                         if (ret <= 0) goto end;
 375                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 376                         s->init_num=0;
 377                         break;
 378
 379                 case SSL3_ST_CW_KEY_EXCH_A:
 380                 case SSL3_ST_CW_KEY_EXCH_B:
 381                         ret=ssl3_send_client_key_exchange(s);
 382                         if (ret <= 0) goto end;
 383                         /* EAY EAY EAY need to check for DH fix cert
 384                          * sent back */
 385                         /* For TLS, cert_req is set to 2, so a cert chain
 386                          * of nothing is sent, but no verify packet is sent */
 387                         /* XXX: For now, we do not support client
 388                          * authentication in ECDH cipher suites with
 389                          * ECDH (rather than ECDSA) certificates.
 390                          * We need to skip the certificate verify
 391                          * message when client's ECDH public key is sent
 392                          * inside the client certificate.
 393                          */
 394                         if (s->s3->tmp.cert_req == 1)
 395                                 {
 396                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 397                                 }
 398                         else
 399                                 {
 400                                 s->state=SSL3_ST_CW_CHANGE_A;
 401                                 s->s3->change_cipher_spec=0;
 402                                 }
 403                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 404                                 {
 405                                 s->state=SSL3_ST_CW_CHANGE_A;
 406                                 s->s3->change_cipher_spec=0;
 407                                 }
 408
 409                         s->init_num=0;
 410                         break;
 411
 412                 case SSL3_ST_CW_CERT_VRFY_A:
 413                 case SSL3_ST_CW_CERT_VRFY_B:
 414                         ret=ssl3_send_client_verify(s);
 415                         if (ret <= 0) goto end;
 416                         s->state=SSL3_ST_CW_CHANGE_A;
 417                         s->init_num=0;
 418                         s->s3->change_cipher_spec=0;
 419                         break;
 420
 421                 case SSL3_ST_CW_CHANGE_A:
 422                 case SSL3_ST_CW_CHANGE_B:
 423                         ret=ssl3_send_change_cipher_spec(s,
 424                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 425                         if (ret <= 0) goto end;
 426                         s->state=SSL3_ST_CW_FINISHED_A;
 427                         s->init_num=0;
 428
 429                         s->session->cipher=s->s3->tmp.new_cipher;
 430 #ifdef OPENSSL_NO_COMP
 431                         s->session->compress_meth=0;
 432 #else
 433                         if (s->s3->tmp.new_compression == NULL)
 434                                 s->session->compress_meth=0;
 435                         else
 436                                 s->session->compress_meth=
 437                                         s->s3->tmp.new_compression->id;
 438 #endif
 439                         if (!s->method->ssl3_enc->setup_key_block(s))
 440                                 {
 441                                 ret= -1;
 442                                 goto end;
 443                                 }
 444
 445                         if (!s->method->ssl3_enc->change_cipher_state(s,
 446                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 447                                 {
 448                                 ret= -1;
 449                                 goto end;
 450                                 }
 451
 452                         break;
 453
 454                 case SSL3_ST_CW_FINISHED_A:
 455                 case SSL3_ST_CW_FINISHED_B:
 456                         ret=ssl3_send_finished(s,
 457                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 458                                 s->method->ssl3_enc->client_finished_label,
 459                                 s->method->ssl3_enc->client_finished_label_len);
 460                         if (ret <= 0) goto end;
 461                         s->state=SSL3_ST_CW_FLUSH;
 462
 463                         /* clear flags */
 464                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 465                         if (s->hit)
 466                                 {
 467                                 s->s3->tmp.next_state=SSL_ST_OK;
 468                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 469                                         {
 470                                         s->state=SSL_ST_OK;
 471                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 472                                         s->s3->delay_buf_pop_ret=0;
 473                                         }
 474                                 }
 475                         else
 476                                 {
 477 #ifndef OPENSSL_NO_TLSEXT
 478                                 /* Allow NewSessionTicket if ticket expected */
 479                                 if (s->tlsext_ticket_expected)
 480                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 481                                 else
 482 #endif
 483
 484                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 485                                 }
 486                         s->init_num=0;
 487                         break;
 488
 489 #ifndef OPENSSL_NO_TLSEXT
 490                 case SSL3_ST_CR_SESSION_TICKET_A:
 491                 case SSL3_ST_CR_SESSION_TICKET_B:
 492                         ret=ssl3_get_new_session_ticket(s);
 493                         if (ret <= 0) goto end;
 494                         s->state=SSL3_ST_CR_FINISHED_A;
 495                         s->init_num=0;
 496                 break;
 497
 498                 case SSL3_ST_CR_CERT_STATUS_A:
 499                 case SSL3_ST_CR_CERT_STATUS_B:
 500                         ret=ssl3_get_cert_status(s);
 501                         if (ret <= 0) goto end;
 502                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 503                         s->init_num=0;
 504                 break;
 505 #endif
 506
 507                 case SSL3_ST_CR_FINISHED_A:
 508                 case SSL3_ST_CR_FINISHED_B:
 509
 510                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 511                                 SSL3_ST_CR_FINISHED_B);
 512                         if (ret <= 0) goto end;
 513
 514                         if (s->hit)
 515                                 s->state=SSL3_ST_CW_CHANGE_A;
 516                         else
 517                                 s->state=SSL_ST_OK;
 518                         s->init_num=0;
 519                         break;
 520
 521                 case SSL3_ST_CW_FLUSH:
 522                         s->rwstate=SSL_WRITING;
 523                         if (BIO_flush(s->wbio) <= 0)
 524                                 {
 525                                 ret= -1;
 526                                 goto end;
 527                                 }
 528                         s->rwstate=SSL_NOTHING;
 529                         s->state=s->s3->tmp.next_state;
 530                         break;
 531
 532                 case SSL_ST_OK:
 533                         /* clean a few things up */
 534                         ssl3_cleanup_key_block(s);
 535
 536                         if (s->init_buf != NULL)
 537                                 {
 538                                 BUF_MEM_free(s->init_buf);
 539                                 s->init_buf=NULL;
 540                                 }
 541
 542                         /* If we are not 'joining' the last two packets,
 543                          * remove the buffering now */
 544                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 545                                 ssl_free_wbio_buffer(s);
 546                         /* else do it later in ssl3_write */
 547
 548                         s->init_num=0;
 549                         s->new_session=0;
 550
 551                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 552                         if (s->hit) s->ctx->stats.sess_hit++;
 553
 554                         ret=1;
 555                         /* s->server=0; */
 556                         s->handshake_func=ssl3_connect;
 557                         s->ctx->stats.sess_connect_good++;
 558
 559                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 560
 561                         goto end;
 562                         /* break; */
 563
 564                 default:
 565                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 566                         ret= -1;
 567                         goto end;
 568                         /* break; */
 569                         }
 570
 571                 /* did we do anything */
 572                 if (!s->s3->tmp.reuse_message && !skip)
 573                         {
 574                         if (s->debug)
 575                                 {
 576                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 577                                         goto end;
 578                                 }
 579
 580                         if ((cb != NULL) && (s->state != state))
 581                                 {
 582                                 new_state=s->state;
 583                                 s->state=state;
 584                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 585                                 s->state=new_state;
 586                                 }
 587                         }
 588                 skip=0;
 589                 }
 590 end:
 591         s->in_handshake--;
 592         if (buf != NULL)
 593                 BUF_MEM_free(buf);
 594         if (cb != NULL)
 595                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 596         return(ret);
 597         }
 598
 599
 600 int ssl3_client_hello(SSL *s)
 601         {
 602         unsigned char *buf;
 603         unsigned char *p,*d;
 604         int i;
 605         unsigned long Time,l;
 606 #ifndef OPENSSL_NO_COMP
 607         int j;
 608         SSL_COMP *comp;
 609 #endif
 610
 611         buf=(unsigned char *)s->init_buf->data;
 612         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 613                 {
 614                 SSL_SESSION *sess = s->session;
 615                 if ((sess == NULL) ||
 616                         (sess->ssl_version != s->version) ||
 617 #ifdef OPENSSL_NO_TLSEXT
 618                         !sess->session_id_length ||
 619 #else
 620                         (!sess->session_id_length && !sess->tlsext_tick) ||
 621 #endif
 622                         (sess->not_resumable))
 623                         {
 624                         if (!ssl_get_new_session(s,0))
 625                                 goto err;
 626                         }
 627                 /* else use the pre-loaded session */
 628
 629                 p=s->s3->client_random;
 630                 Time=(unsigned long)time(NULL);                 /* Time */
 631                 l2n(Time,p);
 632                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 633                         goto err;
 634
 635                 /* Do the message type and length last */
 636                 d=p= &(buf[4]);
 637
 638                 *(p++)=s->version>>8;
 639                 *(p++)=s->version&0xff;
 640                 s->client_version=s->version;
 641
 642                 /* Random stuff */
 643                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 644                 p+=SSL3_RANDOM_SIZE;
 645
 646                 /* Session ID */
 647                 if (s->new_session)
 648                         i=0;
 649                 else
 650                         i=s->session->session_id_length;
 651                 *(p++)=i;
 652                 if (i != 0)
 653                         {
 654                         if (i > (int)sizeof(s->session->session_id))
 655                                 {
 656                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 657                                 goto err;
 658                                 }
 659                         memcpy(p,s->session->session_id,i);
 660                         p+=i;
 661                         }
 662
 663                 /* Ciphers supported */
 664                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 665                 if (i == 0)
 666                         {
 667                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 668                         goto err;
 669                         }
 670                 s2n(i,p);
 671                 p+=i;
 672
 673                 /* COMPRESSION */
 674 #ifdef OPENSSL_NO_COMP
 675                 *(p++)=1;
 676 #else
 677
 678                 if ((s->options & SSL_OP_NO_COMPRESSION)
 679                                         || !s->ctx->comp_methods)
 680                         j=0;
 681                 else
 682                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 683                 *(p++)=1+j;
 684                 for (i=0; i<j; i++)
 685                         {
 686                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 687                         *(p++)=comp->id;
 688                         }
 689 #endif
 690                 *(p++)=0; /* Add the NULL method */
 691
 692 #ifndef OPENSSL_NO_TLSEXT
 693                 /* TLS extensions*/
 694                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 695                         {
 696                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 697                         goto err;
 698                         }
 699                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 700                         {
 701                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 702                         goto err;
 703                         }
 704 #endif
 705
 706                 l=(p-d);
 707                 d=buf;
 708                 *(d++)=SSL3_MT_CLIENT_HELLO;
 709                 l2n3(l,d);
 710
 711                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 712                 /* number of bytes to write */
 713                 s->init_num=p-buf;
 714                 s->init_off=0;
 715                 }
 716
 717         /* SSL3_ST_CW_CLNT_HELLO_B */
 718         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 719 err:
 720         return(-1);
 721         }
 722
 723 int ssl3_get_server_hello(SSL *s)
 724         {
 725         STACK_OF(SSL_CIPHER) *sk;
 726         const SSL_CIPHER *c;
 727         unsigned char *p,*d;
 728         int i,al,ok;
 729         unsigned int j;
 730         long n;
 731 #ifndef OPENSSL_NO_COMP
 732         SSL_COMP *comp;
 733 #endif
 734
 735         n=s->method->ssl_get_message(s,
 736                 SSL3_ST_CR_SRVR_HELLO_A,
 737                 SSL3_ST_CR_SRVR_HELLO_B,
 738                 -1,
 739                 20000, /* ?? */
 740                 &ok);
 741
 742         if (!ok) return((int)n);
 743
 744         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 745                 {
 746                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 747                         {
 748                         if ( s->d1->send_cookie == 0)
 749                                 {
 750                                 s->s3->tmp.reuse_message = 1;
 751                                 return 1;
 752                                 }
 753                         else /* already sent a cookie */
 754                                 {
 755                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 756                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 757                                 goto f_err;
 758                                 }
 759                         }
 760                 }
 761
 762         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 763                 {
 764                 al=SSL_AD_UNEXPECTED_MESSAGE;
 765                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 766                 goto f_err;
 767                 }
 768
 769         d=p=(unsigned char *)s->init_msg;
 770
 771         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 772                 {
 773                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 774                 s->version=(s->version&0xff00)|p[1];
 775                 al=SSL_AD_PROTOCOL_VERSION;
 776                 goto f_err;
 777                 }
 778         p+=2;
 779
 780         /* load the server hello data */
 781         /* load the server random */
 782         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 783         p+=SSL3_RANDOM_SIZE;
 784
 785         /* get the session-id */
 786         j= *(p++);
 787
 788         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 789                 {
 790                 al=SSL_AD_ILLEGAL_PARAMETER;
 791                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 792                 goto f_err;
 793                 }
 794
 795 #ifndef OPENSSL_NO_TLSEXT
 796         /* check if we want to resume the session based on external pre-shared secret */
 797         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 798                 {
 799                 SSL_CIPHER *pref_cipher=NULL;
 800                 s->session->master_key_length=sizeof(s->session->master_key);
 801                 if (s->tls_session_secret_cb(s, s->session->master_key,
 802                                              &s->session->master_key_length,
 803                                              NULL, &pref_cipher,
 804                                              s->tls_session_secret_cb_arg))
 805                         {
 806                         s->session->cipher = pref_cipher ?
 807                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 808                         }
 809                 }
 810 #endif /* OPENSSL_NO_TLSEXT */
 811
 812         if (j != 0 && j == s->session->session_id_length
 813             && memcmp(p,s->session->session_id,j) == 0)
 814             {
 815             if(s->sid_ctx_length != s->session->sid_ctx_length
 816                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 817                 {
 818                 /* actually a client application bug */
 819                 al=SSL_AD_ILLEGAL_PARAMETER;
 820                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 821                 goto f_err;
 822                 }
 823             s->hit=1;
 824             }
 825         else    /* a miss or crap from the other end */
 826                 {
 827                 /* If we were trying for session-id reuse, make a new
 828                  * SSL_SESSION so we don't stuff up other people */
 829                 s->hit=0;
 830                 if (s->session->session_id_length > 0)
 831                         {
 832                         if (!ssl_get_new_session(s,0))
 833                                 {
 834                                 al=SSL_AD_INTERNAL_ERROR;
 835                                 goto f_err;
 836                                 }
 837                         }
 838                 s->session->session_id_length=j;
 839                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 840                 }
 841         p+=j;
 842         c=ssl_get_cipher_by_char(s,p);
 843         if (c == NULL)
 844                 {
 845                 /* unknown cipher */
 846                 al=SSL_AD_ILLEGAL_PARAMETER;
 847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 848                 goto f_err;
 849                 }
 850         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 851
 852         sk=ssl_get_ciphers_by_id(s);
 853         i=sk_SSL_CIPHER_find(sk,c);
 854         if (i < 0)
 855                 {
 856                 /* we did not say we would use this cipher */
 857                 al=SSL_AD_ILLEGAL_PARAMETER;
 858                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 859                 goto f_err;
 860                 }
 861
 862         /* Depending on the session caching (internal/external), the cipher
 863            and/or cipher_id values may not be set. Make sure that
 864            cipher_id is set and use it for comparison. */
 865         if (s->session->cipher)
 866                 s->session->cipher_id = s->session->cipher->id;
 867         if (s->hit && (s->session->cipher_id != c->id))
 868                 {
 869 /* Workaround is now obsolete */
 870 #if 0
 871                 if (!(s->options &
 872                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 873 #endif
 874                         {
 875                         al=SSL_AD_ILLEGAL_PARAMETER;
 876                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 877                         goto f_err;
 878                         }
 879                 }
 880         s->s3->tmp.new_cipher=c;
 881         if (!ssl3_digest_cached_records(s))
 882                 goto f_err;
 883
 884         /* lets get the compression algorithm */
 885         /* COMPRESSION */
 886 #ifdef OPENSSL_NO_COMP
 887         if (*(p++) != 0)
 888                 {
 889                 al=SSL_AD_ILLEGAL_PARAMETER;
 890                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 891                 goto f_err;
 892                 }
 893         /* If compression is disabled we'd better not try to resume a session
 894          * using compression.
 895          */
 896         if (s->session->compress_meth != 0)
 897                 {
 898                 al=SSL_AD_INTERNAL_ERROR;
 899                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 900                 goto f_err;
 901                 }
 902 #else
 903         j= *(p++);
 904         if (s->hit && j != s->session->compress_meth)
 905                 {
 906                 al=SSL_AD_ILLEGAL_PARAMETER;
 907                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 908                 goto f_err;
 909                 }
 910         if (j == 0)
 911                 comp=NULL;
 912         else if (s->options & SSL_OP_NO_COMPRESSION)
 913                 {
 914                 al=SSL_AD_ILLEGAL_PARAMETER;
 915                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 916                 goto f_err;
 917                 }
 918         else
 919                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 920
 921         if ((j != 0) && (comp == NULL))
 922                 {
 923                 al=SSL_AD_ILLEGAL_PARAMETER;
 924                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 925                 goto f_err;
 926                 }
 927         else
 928                 {
 929                 s->s3->tmp.new_compression=comp;
 930                 }
 931 #endif
 932
 933 #ifndef OPENSSL_NO_TLSEXT
 934         /* TLS extensions*/
 935         if (s->version >= SSL3_VERSION)
 936                 {
 937                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 938                         {
 939                         /* 'al' set by ssl_parse_serverhello_tlsext */
 940                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 941                         goto f_err;
 942                         }
 943                 if (ssl_check_serverhello_tlsext(s) <= 0)
 944                         {
 945                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 946                                 goto err;
 947                         }
 948                 }
 949 #endif
 950
 951         if (p != (d+n))
 952                 {
 953                 /* wrong packet length */
 954                 al=SSL_AD_DECODE_ERROR;
 955                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 956                 goto err;
 957                 }
 958
 959         return(1);
 960 f_err:
 961         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 962 err:
 963         return(-1);
 964         }
 965
 966 int ssl3_get_server_certificate(SSL *s)
 967         {
 968         int al,i,ok,ret= -1;
 969         unsigned long n,nc,llen,l;
 970         X509 *x=NULL;
 971         const unsigned char *q,*p;
 972         unsigned char *d;
 973         STACK_OF(X509) *sk=NULL;
 974         SESS_CERT *sc;
 975         EVP_PKEY *pkey=NULL;
 976         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 977
 978         n=s->method->ssl_get_message(s,
 979                 SSL3_ST_CR_CERT_A,
 980                 SSL3_ST_CR_CERT_B,
 981                 -1,
 982                 s->max_cert_list,
 983                 &ok);
 984
 985         if (!ok) return((int)n);
 986
 987         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 988                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
 989                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 990                 {
 991                 s->s3->tmp.reuse_message=1;
 992                 return(1);
 993                 }
 994
 995         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 996                 {
 997                 al=SSL_AD_UNEXPECTED_MESSAGE;
 998                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 999                 goto f_err;
1000                 }
1001         p=d=(unsigned char *)s->init_msg;
1002
1003         if ((sk=sk_X509_new_null()) == NULL)
1004                 {
1005                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1006                 goto err;
1007                 }
1008
1009         n2l3(p,llen);
1010         if (llen+3 != n)
1011                 {
1012                 al=SSL_AD_DECODE_ERROR;
1013                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1014                 goto f_err;
1015                 }
1016         for (nc=0; nc<llen; )
1017                 {
1018                 n2l3(p,l);
1019                 if ((l+nc+3) > llen)
1020                         {
1021                         al=SSL_AD_DECODE_ERROR;
1022                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1023                         goto f_err;
1024                         }
1025
1026                 q=p;
1027                 x=d2i_X509(NULL,&q,l);
1028                 if (x == NULL)
1029                         {
1030                         al=SSL_AD_BAD_CERTIFICATE;
1031                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1032                         goto f_err;
1033                         }
1034                 if (q != (p+l))
1035                         {
1036                         al=SSL_AD_DECODE_ERROR;
1037                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1038                         goto f_err;
1039                         }
1040                 if (!sk_X509_push(sk,x))
1041                         {
1042                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1043                         goto err;
1044                         }
1045                 x=NULL;
1046                 nc+=l+3;
1047                 p=q;
1048                 }
1049
1050         i=ssl_verify_cert_chain(s,sk);
1051         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1052 #ifndef OPENSSL_NO_KRB5
1053             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1054                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1055 #endif /* OPENSSL_NO_KRB5 */
1056                 )
1057                 {
1058                 al=ssl_verify_alarm_type(s->verify_result);
1059                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1060                 goto f_err;
1061                 }
1062         ERR_clear_error(); /* but we keep s->verify_result */
1063
1064         sc=ssl_sess_cert_new();
1065         if (sc == NULL) goto err;
1066
1067         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1068         s->session->sess_cert=sc;
1069
1070         sc->cert_chain=sk;
1071         /* Inconsistency alert: cert_chain does include the peer's
1072          * certificate, which we don't include in s3_srvr.c */
1073         x=sk_X509_value(sk,0);
1074         sk=NULL;
1075         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1076
1077         pkey=X509_get_pubkey(x);
1078
1079         /* VRS: allow null cert if auth == KRB5 */
1080         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1081                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1082                     ? 0 : 1;
1083
1084 #ifdef KSSL_DEBUG
1085         printf("pkey,x = %p, %p\n", pkey,x);
1086         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1087         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1088                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1089 #endif    /* KSSL_DEBUG */
1090
1091         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1092                 {
1093                 x=NULL;
1094                 al=SSL3_AL_FATAL;
1095                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1096                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1097                 goto f_err;
1098                 }
1099
1100         i=ssl_cert_type(x,pkey);
1101         if (need_cert && i < 0)
1102                 {
1103                 x=NULL;
1104                 al=SSL3_AL_FATAL;
1105                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1106                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1107                 goto f_err;
1108                 }
1109
1110         if (need_cert)
1111                 {
1112                 sc->peer_cert_type=i;
1113                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1114                 /* Why would the following ever happen?
1115                  * We just created sc a couple of lines ago. */
1116                 if (sc->peer_pkeys[i].x509 != NULL)
1117                         X509_free(sc->peer_pkeys[i].x509);
1118                 sc->peer_pkeys[i].x509=x;
1119                 sc->peer_key= &(sc->peer_pkeys[i]);
1120
1121                 if (s->session->peer != NULL)
1122                         X509_free(s->session->peer);
1123                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1124                 s->session->peer=x;
1125                 }
1126         else
1127                 {
1128                 sc->peer_cert_type=i;
1129                 sc->peer_key= NULL;
1130
1131                 if (s->session->peer != NULL)
1132                         X509_free(s->session->peer);
1133                 s->session->peer=NULL;
1134                 }
1135         s->session->verify_result = s->verify_result;
1136
1137         x=NULL;
1138         ret=1;
1139
1140         if (0)
1141                 {
1142 f_err:
1143                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1144                 }
1145 err:
1146         EVP_PKEY_free(pkey);
1147         X509_free(x);
1148         sk_X509_pop_free(sk,X509_free);
1149         return(ret);
1150         }
1151
1152 int ssl3_get_key_exchange(SSL *s)
1153         {
1154 #ifndef OPENSSL_NO_RSA
1155         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1156 #endif
1157         EVP_MD_CTX md_ctx;
1158         unsigned char *param,*p;
1159         int al,i,j,param_len,ok;
1160         long n,alg_k,alg_a;
1161         EVP_PKEY *pkey=NULL;
1162 #ifndef OPENSSL_NO_RSA
1163         RSA *rsa=NULL;
1164 #endif
1165 #ifndef OPENSSL_NO_DH
1166         DH *dh=NULL;
1167 #endif
1168 #ifndef OPENSSL_NO_ECDH
1169         EC_KEY *ecdh = NULL;
1170         BN_CTX *bn_ctx = NULL;
1171         EC_POINT *srvr_ecpoint = NULL;
1172         int curve_nid = 0;
1173         int encoded_pt_len = 0;
1174 #endif
1175
1176         /* use same message size as in ssl3_get_certificate_request()
1177          * as ServerKeyExchange message may be skipped */
1178         n=s->method->ssl_get_message(s,
1179                 SSL3_ST_CR_KEY_EXCH_A,
1180                 SSL3_ST_CR_KEY_EXCH_B,
1181                 -1,
1182                 s->max_cert_list,
1183                 &ok);
1184         if (!ok) return((int)n);
1185
1186         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1187                 {
1188 #ifndef OPENSSL_NO_PSK
1189                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1190                    omitted if no identity hint is sent. Set
1191                    session->sess_cert anyway to avoid problems
1192                    later.*/
1193                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1194                         {
1195                         s->session->sess_cert=ssl_sess_cert_new();
1196                         if (s->ctx->psk_identity_hint)
1197                                 OPENSSL_free(s->ctx->psk_identity_hint);
1198                         s->ctx->psk_identity_hint = NULL;
1199                         }
1200 #endif
1201                 s->s3->tmp.reuse_message=1;
1202                 return(1);
1203                 }
1204
1205         param=p=(unsigned char *)s->init_msg;
1206         if (s->session->sess_cert != NULL)
1207                 {
1208 #ifndef OPENSSL_NO_RSA
1209                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1210                         {
1211                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1212                         s->session->sess_cert->peer_rsa_tmp=NULL;
1213                         }
1214 #endif
1215 #ifndef OPENSSL_NO_DH
1216                 if (s->session->sess_cert->peer_dh_tmp)
1217                         {
1218                         DH_free(s->session->sess_cert->peer_dh_tmp);
1219                         s->session->sess_cert->peer_dh_tmp=NULL;
1220                         }
1221 #endif
1222 #ifndef OPENSSL_NO_ECDH
1223                 if (s->session->sess_cert->peer_ecdh_tmp)
1224                         {
1225                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1226                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1227                         }
1228 #endif
1229                 }
1230         else
1231                 {
1232                 s->session->sess_cert=ssl_sess_cert_new();
1233                 }
1234
1235         param_len=0;
1236         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1237         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1238         EVP_MD_CTX_init(&md_ctx);
1239
1240 #ifndef OPENSSL_NO_PSK
1241         if (alg_k & SSL_kPSK)
1242                 {
1243                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1244
1245                 al=SSL_AD_HANDSHAKE_FAILURE;
1246                 n2s(p,i);
1247                 param_len=i+2;
1248                 /* Store PSK identity hint for later use, hint is used
1249                  * in ssl3_send_client_key_exchange.  Assume that the
1250                  * maximum length of a PSK identity hint can be as
1251                  * long as the maximum length of a PSK identity. */
1252                 if (i > PSK_MAX_IDENTITY_LEN)
1253                         {
1254                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1255                                 SSL_R_DATA_LENGTH_TOO_LONG);
1256                         goto f_err;
1257                         }
1258                 if (param_len > n)
1259                         {
1260                         al=SSL_AD_DECODE_ERROR;
1261                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1262                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1263                         goto f_err;
1264                         }
1265                 /* If received PSK identity hint contains NULL
1266                  * characters, the hint is truncated from the first
1267                  * NULL. p may not be ending with NULL, so create a
1268                  * NULL-terminated string. */
1269                 memcpy(tmp_id_hint, p, i);
1270                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1271                 if (s->ctx->psk_identity_hint != NULL)
1272                         OPENSSL_free(s->ctx->psk_identity_hint);
1273                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1274                 if (s->ctx->psk_identity_hint == NULL)
1275                         {
1276                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1277                         goto f_err;
1278                         }
1279
1280                 p+=i;
1281                 n-=param_len;
1282                 }
1283         else
1284 #endif /* !OPENSSL_NO_PSK */
1285 #ifndef OPENSSL_NO_RSA
1286         if (alg_k & SSL_kRSA)
1287                 {
1288                 if ((rsa=RSA_new()) == NULL)
1289                         {
1290                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1291                         goto err;
1292                         }
1293                 n2s(p,i);
1294                 param_len=i+2;
1295                 if (param_len > n)
1296                         {
1297                         al=SSL_AD_DECODE_ERROR;
1298                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1299                         goto f_err;
1300                         }
1301                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1302                         {
1303                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1304                         goto err;
1305                         }
1306                 p+=i;
1307
1308                 n2s(p,i);
1309                 param_len+=i+2;
1310                 if (param_len > n)
1311                         {
1312                         al=SSL_AD_DECODE_ERROR;
1313                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1314                         goto f_err;
1315                         }
1316                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1317                         {
1318                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1319                         goto err;
1320                         }
1321                 p+=i;
1322                 n-=param_len;
1323
1324                 /* this should be because we are using an export cipher */
1325                 if (alg_a & SSL_aRSA)
1326                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1327                 else
1328                         {
1329                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1330                         goto err;
1331                         }
1332                 s->session->sess_cert->peer_rsa_tmp=rsa;
1333                 rsa=NULL;
1334                 }
1335 #else /* OPENSSL_NO_RSA */
1336         if (0)
1337                 ;
1338 #endif
1339 #ifndef OPENSSL_NO_DH
1340         else if (alg_k & SSL_kEDH)
1341                 {
1342                 if ((dh=DH_new()) == NULL)
1343                         {
1344                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1345                         goto err;
1346                         }
1347                 n2s(p,i);
1348                 param_len=i+2;
1349                 if (param_len > n)
1350                         {
1351                         al=SSL_AD_DECODE_ERROR;
1352                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1353                         goto f_err;
1354                         }
1355                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1356                         {
1357                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1358                         goto err;
1359                         }
1360                 p+=i;
1361
1362                 n2s(p,i);
1363                 param_len+=i+2;
1364                 if (param_len > n)
1365                         {
1366                         al=SSL_AD_DECODE_ERROR;
1367                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1368                         goto f_err;
1369                         }
1370                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1373                         goto err;
1374                         }
1375                 p+=i;
1376
1377                 n2s(p,i);
1378                 param_len+=i+2;
1379                 if (param_len > n)
1380                         {
1381                         al=SSL_AD_DECODE_ERROR;
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1383                         goto f_err;
1384                         }
1385                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1386                         {
1387                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1388                         goto err;
1389                         }
1390                 p+=i;
1391                 n-=param_len;
1392
1393 #ifndef OPENSSL_NO_RSA
1394                 if (alg_a & SSL_aRSA)
1395                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1396 #else
1397                 if (0)
1398                         ;
1399 #endif
1400 #ifndef OPENSSL_NO_DSA
1401                 else if (alg_a & SSL_aDSS)
1402                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1403 #endif
1404                 /* else anonymous DH, so no certificate or pkey. */
1405
1406                 s->session->sess_cert->peer_dh_tmp=dh;
1407                 dh=NULL;
1408                 }
1409         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1410                 {
1411                 al=SSL_AD_ILLEGAL_PARAMETER;
1412                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1413                 goto f_err;
1414                 }
1415 #endif /* !OPENSSL_NO_DH */
1416
1417 #ifndef OPENSSL_NO_ECDH
1418         else if (alg_k & SSL_kEECDH)
1419                 {
1420                 EC_GROUP *ngroup;
1421                 const EC_GROUP *group;
1422
1423                 if ((ecdh=EC_KEY_new()) == NULL)
1424                         {
1425                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1426                         goto err;
1427                         }
1428
1429                 /* Extract elliptic curve parameters and the
1430                  * server's ephemeral ECDH public key.
1431                  * Keep accumulating lengths of various components in
1432                  * param_len and make sure it never exceeds n.
1433                  */
1434
1435                 /* XXX: For now we only support named (not generic) curves
1436                  * and the ECParameters in this case is just three bytes.
1437                  */
1438                 param_len=3;
1439                 if ((param_len > n) ||
1440                     (*p != NAMED_CURVE_TYPE) ||
1441                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1442                         {
1443                         al=SSL_AD_INTERNAL_ERROR;
1444                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1445                         goto f_err;
1446                         }
1447
1448                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1449                 if (ngroup == NULL)
1450                         {
1451                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1452                         goto err;
1453                         }
1454                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1455                         {
1456                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1457                         goto err;
1458                         }
1459                 EC_GROUP_free(ngroup);
1460
1461                 group = EC_KEY_get0_group(ecdh);
1462
1463                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1464                     (EC_GROUP_get_degree(group) > 163))
1465                         {
1466                         al=SSL_AD_EXPORT_RESTRICTION;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1468                         goto f_err;
1469                         }
1470
1471                 p+=3;
1472
1473                 /* Next, get the encoded ECPoint */
1474                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1475                     ((bn_ctx = BN_CTX_new()) == NULL))
1476                         {
1477                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1478                         goto err;
1479                         }
1480
1481                 encoded_pt_len = *p;  /* length of encoded point */
1482                 p+=1;
1483                 param_len += (1 + encoded_pt_len);
1484                 if ((param_len > n) ||
1485                     (EC_POINT_oct2point(group, srvr_ecpoint,
1486                         p, encoded_pt_len, bn_ctx) == 0))
1487                         {
1488                         al=SSL_AD_DECODE_ERROR;
1489                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1490                         goto f_err;
1491                         }
1492
1493                 n-=param_len;
1494                 p+=encoded_pt_len;
1495
1496                 /* The ECC/TLS specification does not mention
1497                  * the use of DSA to sign ECParameters in the server
1498                  * key exchange message. We do support RSA and ECDSA.
1499                  */
1500                 if (0) ;
1501 #ifndef OPENSSL_NO_RSA
1502                 else if (alg_a & SSL_aRSA)
1503                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1504 #endif
1505 #ifndef OPENSSL_NO_ECDSA
1506                 else if (alg_a & SSL_aECDSA)
1507                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1508 #endif
1509                 /* else anonymous ECDH, so no certificate or pkey. */
1510                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1511                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1512                 ecdh=NULL;
1513                 BN_CTX_free(bn_ctx);
1514                 bn_ctx = NULL;
1515                 EC_POINT_free(srvr_ecpoint);
1516                 srvr_ecpoint = NULL;
1517                 }
1518         else if (alg_k)
1519                 {
1520                 al=SSL_AD_UNEXPECTED_MESSAGE;
1521                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1522                 goto f_err;
1523                 }
1524 #endif /* !OPENSSL_NO_ECDH */
1525
1526
1527         /* p points to the next byte, there are 'n' bytes left */
1528
1529         /* if it was signed, check the signature */
1530         if (pkey != NULL)
1531                 {
1532                 n2s(p,i);
1533                 n-=2;
1534                 j=EVP_PKEY_size(pkey);
1535
1536                 if ((i != n) || (n > j) || (n <= 0))
1537                         {
1538                         /* wrong packet length */
1539                         al=SSL_AD_DECODE_ERROR;
1540                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1541                         goto f_err;
1542                         }
1543
1544 #ifndef OPENSSL_NO_RSA
1545                 if (pkey->type == EVP_PKEY_RSA)
1546                         {
1547                         int num;
1548
1549                         j=0;
1550                         q=md_buf;
1551                         for (num=2; num > 0; num--)
1552                                 {
1553                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1554                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1555                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1556                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1557                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1558                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1559                                 q+=i;
1560                                 j+=i;
1561                                 }
1562                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1563                                                                 pkey->pkey.rsa);
1564                         if (i < 0)
1565                                 {
1566                                 al=SSL_AD_DECRYPT_ERROR;
1567                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1568                                 goto f_err;
1569                                 }
1570                         if (i == 0)
1571                                 {
1572                                 /* bad signature */
1573                                 al=SSL_AD_DECRYPT_ERROR;
1574                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1575                                 goto f_err;
1576                                 }
1577                         }
1578                 else
1579 #endif
1580 #ifndef OPENSSL_NO_DSA
1581                         if (pkey->type == EVP_PKEY_DSA)
1582                         {
1583                         /* lets do DSS */
1584                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1585                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1586                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1587                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1588                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1589                                 {
1590                                 /* bad signature */
1591                                 al=SSL_AD_DECRYPT_ERROR;
1592                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1593                                 goto f_err;
1594                                 }
1595                         }
1596                 else
1597 #endif
1598 #ifndef OPENSSL_NO_ECDSA
1599                         if (pkey->type == EVP_PKEY_EC)
1600                         {
1601                         /* let's do ECDSA */
1602                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1603                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1604                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1605                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1606                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1607                                 {
1608                                 /* bad signature */
1609                                 al=SSL_AD_DECRYPT_ERROR;
1610                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1611                                 goto f_err;
1612                                 }
1613                         }
1614                 else
1615 #endif
1616                         {
1617                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1618                         goto err;
1619                         }
1620                 }
1621         else
1622                 {
1623                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1624                         /* aNULL or kPSK do not need public keys */
1625                         {
1626                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1627                         goto err;
1628                         }
1629                 /* still data left over */
1630                 if (n != 0)
1631                         {
1632                         al=SSL_AD_DECODE_ERROR;
1633                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1634                         goto f_err;
1635                         }
1636                 }
1637         EVP_PKEY_free(pkey);
1638         EVP_MD_CTX_cleanup(&md_ctx);
1639         return(1);
1640 f_err:
1641         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1642 err:
1643         EVP_PKEY_free(pkey);
1644 #ifndef OPENSSL_NO_RSA
1645         if (rsa != NULL)
1646                 RSA_free(rsa);
1647 #endif
1648 #ifndef OPENSSL_NO_DH
1649         if (dh != NULL)
1650                 DH_free(dh);
1651 #endif
1652 #ifndef OPENSSL_NO_ECDH
1653         BN_CTX_free(bn_ctx);
1654         EC_POINT_free(srvr_ecpoint);
1655         if (ecdh != NULL)
1656                 EC_KEY_free(ecdh);
1657 #endif
1658         EVP_MD_CTX_cleanup(&md_ctx);
1659         return(-1);
1660         }
1661
1662 int ssl3_get_certificate_request(SSL *s)
1663         {
1664         int ok,ret=0;
1665         unsigned long n,nc,l;
1666         unsigned int llen,ctype_num,i;
1667         X509_NAME *xn=NULL;
1668         const unsigned char *p,*q;
1669         unsigned char *d;
1670         STACK_OF(X509_NAME) *ca_sk=NULL;
1671
1672         n=s->method->ssl_get_message(s,
1673                 SSL3_ST_CR_CERT_REQ_A,
1674                 SSL3_ST_CR_CERT_REQ_B,
1675                 -1,
1676                 s->max_cert_list,
1677                 &ok);
1678
1679         if (!ok) return((int)n);
1680
1681         s->s3->tmp.cert_req=0;
1682
1683         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1684                 {
1685                 s->s3->tmp.reuse_message=1;
1686                 return(1);
1687                 }
1688
1689         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1690                 {
1691                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1692                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1693                 goto err;
1694                 }
1695
1696         /* TLS does not like anon-DH with client cert */
1697         if (s->version > SSL3_VERSION)
1698                 {
1699                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1700                         {
1701                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1702                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1703                         goto err;
1704                         }
1705                 }
1706
1707         p=d=(unsigned char *)s->init_msg;
1708
1709         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1710                 {
1711                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1712                 goto err;
1713                 }
1714
1715         /* get the certificate types */
1716         ctype_num= *(p++);
1717         if (ctype_num > SSL3_CT_NUMBER)
1718                 ctype_num=SSL3_CT_NUMBER;
1719         for (i=0; i<ctype_num; i++)
1720                 s->s3->tmp.ctype[i]= p[i];
1721         p+=ctype_num;
1722
1723         /* get the CA RDNs */
1724         n2s(p,llen);
1725 #if 0
1726 {
1727 FILE *out;
1728 out=fopen("/tmp/vsign.der","w");
1729 fwrite(p,1,llen,out);
1730 fclose(out);
1731 }
1732 #endif
1733
1734         if ((llen+ctype_num+2+1) != n)
1735                 {
1736                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1737                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1738                 goto err;
1739                 }
1740
1741         for (nc=0; nc<llen; )
1742                 {
1743                 n2s(p,l);
1744                 if ((l+nc+2) > llen)
1745                         {
1746                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1747                                 goto cont; /* netscape bugs */
1748                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1749                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1750                         goto err;
1751                         }
1752
1753                 q=p;
1754
1755                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1756                         {
1757                         /* If netscape tolerance is on, ignore errors */
1758                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1759                                 goto cont;
1760                         else
1761                                 {
1762                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1763                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1764                                 goto err;
1765                                 }
1766                         }
1767
1768                 if (q != (p+l))
1769                         {
1770                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1771                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1772                         goto err;
1773                         }
1774                 if (!sk_X509_NAME_push(ca_sk,xn))
1775                         {
1776                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1777                         goto err;
1778                         }
1779
1780                 p+=l;
1781                 nc+=l+2;
1782                 }
1783
1784         if (0)
1785                 {
1786 cont:
1787                 ERR_clear_error();
1788                 }
1789
1790         /* we should setup a certificate to return.... */
1791         s->s3->tmp.cert_req=1;
1792         s->s3->tmp.ctype_num=ctype_num;
1793         if (s->s3->tmp.ca_names != NULL)
1794                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1795         s->s3->tmp.ca_names=ca_sk;
1796         ca_sk=NULL;
1797
1798         ret=1;
1799 err:
1800         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1801         return(ret);
1802         }
1803
1804 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1805         {
1806         return(X509_NAME_cmp(*a,*b));
1807         }
1808 #ifndef OPENSSL_NO_TLSEXT
1809 int ssl3_get_new_session_ticket(SSL *s)
1810         {
1811         int ok,al,ret=0, ticklen;
1812         long n;
1813         const unsigned char *p;
1814         unsigned char *d;
1815
1816         n=s->method->ssl_get_message(s,
1817                 SSL3_ST_CR_SESSION_TICKET_A,
1818                 SSL3_ST_CR_SESSION_TICKET_B,
1819                 -1,
1820                 16384,
1821                 &ok);
1822
1823         if (!ok)
1824                 return((int)n);
1825
1826         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1827                 {
1828                 s->s3->tmp.reuse_message=1;
1829                 return(1);
1830                 }
1831         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1832                 {
1833                 al=SSL_AD_UNEXPECTED_MESSAGE;
1834                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1835                 goto f_err;
1836                 }
1837         if (n < 6)
1838                 {
1839                 /* need at least ticket_lifetime_hint + ticket length */
1840                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1841                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1842                 goto f_err;
1843                 }
1844
1845         p=d=(unsigned char *)s->init_msg;
1846         n2l(p, s->session->tlsext_tick_lifetime_hint);
1847         n2s(p, ticklen);
1848         /* ticket_lifetime_hint + ticket_length + ticket */
1849         if (ticklen + 6 != n)
1850                 {
1851                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1852                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1853                 goto f_err;
1854                 }
1855         if (s->session->tlsext_tick)
1856                 {
1857                 OPENSSL_free(s->session->tlsext_tick);
1858                 s->session->tlsext_ticklen = 0;
1859                 }
1860         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1861         if (!s->session->tlsext_tick)
1862                 {
1863                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1864                 goto err;
1865                 }
1866         memcpy(s->session->tlsext_tick, p, ticklen);
1867         s->session->tlsext_ticklen = ticklen;
1868         /* There are two ways to detect a resumed ticket sesion.
1869          * One is to set an appropriate session ID and then the server
1870          * must return a match in ServerHello. This allows the normal
1871          * client session ID matching to work and we know much
1872          * earlier that the ticket has been accepted.
1873          *
1874          * The other way is to set zero length session ID when the
1875          * ticket is presented and rely on the handshake to determine
1876          * session resumption.
1877          *
1878          * We choose the former approach because this fits in with
1879          * assumptions elsewhere in OpenSSL. The session ID is set
1880          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1881          * ticket.
1882          */
1883         EVP_Digest(p, ticklen,
1884                         s->session->session_id, &s->session->session_id_length,
1885 #ifndef OPENSSL_NO_SHA256
1886                                                         EVP_sha256(), NULL);
1887 #else
1888                                                         EVP_sha1(), NULL);
1889 #endif
1890         ret=1;
1891         return(ret);
1892 f_err:
1893         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1894 err:
1895         return(-1);
1896         }
1897
1898 int ssl3_get_cert_status(SSL *s)
1899         {
1900         int ok, al;
1901         unsigned long resplen,n;
1902         const unsigned char *p;
1903
1904         n=s->method->ssl_get_message(s,
1905                 SSL3_ST_CR_CERT_STATUS_A,
1906                 SSL3_ST_CR_CERT_STATUS_B,
1907                 SSL3_MT_CERTIFICATE_STATUS,
1908                 16384,
1909                 &ok);
1910
1911         if (!ok) return((int)n);
1912         if (n < 4)
1913                 {
1914                 /* need at least status type + length */
1915                 al = SSL_AD_DECODE_ERROR;
1916                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1917                 goto f_err;
1918                 }
1919         p = (unsigned char *)s->init_msg;
1920         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1921                 {
1922                 al = SSL_AD_DECODE_ERROR;
1923                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1924                 goto f_err;
1925                 }
1926         n2l3(p, resplen);
1927         if (resplen + 4 != n)
1928                 {
1929                 al = SSL_AD_DECODE_ERROR;
1930                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1931                 goto f_err;
1932                 }
1933         if (s->tlsext_ocsp_resp)
1934                 OPENSSL_free(s->tlsext_ocsp_resp);
1935         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1936         if (!s->tlsext_ocsp_resp)
1937                 {
1938                 al = SSL_AD_INTERNAL_ERROR;
1939                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1940                 goto f_err;
1941                 }
1942         s->tlsext_ocsp_resplen = resplen;
1943         if (s->ctx->tlsext_status_cb)
1944                 {
1945                 int ret;
1946                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1947                 if (ret == 0)
1948                         {
1949                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1950                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1951                         goto f_err;
1952                         }
1953                 if (ret < 0)
1954                         {
1955                         al = SSL_AD_INTERNAL_ERROR;
1956                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1957                         goto f_err;
1958                         }
1959                 }
1960         return 1;
1961 f_err:
1962         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1963         return(-1);
1964         }
1965 #endif
1966
1967 int ssl3_get_server_done(SSL *s)
1968         {
1969         int ok,ret=0;
1970         long n;
1971
1972         n=s->method->ssl_get_message(s,
1973                 SSL3_ST_CR_SRVR_DONE_A,
1974                 SSL3_ST_CR_SRVR_DONE_B,
1975                 SSL3_MT_SERVER_DONE,
1976                 30, /* should be very small, like 0 :-) */
1977                 &ok);
1978
1979         if (!ok) return((int)n);
1980         if (n > 0)
1981                 {
1982                 /* should contain no data */
1983                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1984                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1985                 return -1;
1986                 }
1987         ret=1;
1988         return(ret);
1989         }
1990
1991
1992 int ssl3_send_client_key_exchange(SSL *s)
1993         {
1994         unsigned char *p,*d;
1995         int n;
1996         unsigned long alg_k;
1997 #ifndef OPENSSL_NO_RSA
1998         unsigned char *q;
1999         EVP_PKEY *pkey=NULL;
2000 #endif
2001 #ifndef OPENSSL_NO_KRB5
2002         KSSL_ERR kssl_err;
2003 #endif /* OPENSSL_NO_KRB5 */
2004 #ifndef OPENSSL_NO_ECDH
2005         EC_KEY *clnt_ecdh = NULL;
2006         const EC_POINT *srvr_ecpoint = NULL;
2007         EVP_PKEY *srvr_pub_pkey = NULL;
2008         unsigned char *encodedPoint = NULL;
2009         int encoded_pt_len = 0;
2010         BN_CTX * bn_ctx = NULL;
2011 #endif
2012
2013         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2014                 {
2015                 d=(unsigned char *)s->init_buf->data;
2016                 p= &(d[4]);
2017
2018                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2019
2020                 /* Fool emacs indentation */
2021                 if (0) {}
2022 #ifndef OPENSSL_NO_RSA
2023                 else if (alg_k & SSL_kRSA)
2024                         {
2025                         RSA *rsa;
2026                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2027
2028                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2029                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2030                         else
2031                                 {
2032                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2033                                 if ((pkey == NULL) ||
2034                                         (pkey->type != EVP_PKEY_RSA) ||
2035                                         (pkey->pkey.rsa == NULL))
2036                                         {
2037                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2038                                         goto err;
2039                                         }
2040                                 rsa=pkey->pkey.rsa;
2041                                 EVP_PKEY_free(pkey);
2042                                 }
2043
2044                         tmp_buf[0]=s->client_version>>8;
2045                         tmp_buf[1]=s->client_version&0xff;
2046                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2047                                         goto err;
2048
2049                         s->session->master_key_length=sizeof tmp_buf;
2050
2051                         q=p;
2052                         /* Fix buf for TLS and beyond */
2053                         if (s->version > SSL3_VERSION)
2054                                 p+=2;
2055                         n=RSA_public_encrypt(sizeof tmp_buf,
2056                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2057 #ifdef PKCS1_CHECK
2058                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2059                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2060 #endif
2061                         if (n <= 0)
2062                                 {
2063                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2064                                 goto err;
2065                                 }
2066
2067                         /* Fix buf for TLS and beyond */
2068                         if (s->version > SSL3_VERSION)
2069                                 {
2070                                 s2n(n,q);
2071                                 n+=2;
2072                                 }
2073
2074                         s->session->master_key_length=
2075                                 s->method->ssl3_enc->generate_master_secret(s,
2076                                         s->session->master_key,
2077                                         tmp_buf,sizeof tmp_buf);
2078                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2079                         }
2080 #endif
2081 #ifndef OPENSSL_NO_KRB5
2082                 else if (alg_k & SSL_kKRB5)
2083                         {
2084                         krb5_error_code krb5rc;
2085                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2086                         /*  krb5_data   krb5_ap_req;  */
2087                         krb5_data       *enc_ticket;
2088                         krb5_data       authenticator, *authp = NULL;
2089                         EVP_CIPHER_CTX  ciph_ctx;
2090                         const EVP_CIPHER *enc = NULL;
2091                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2092                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2093                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2094                                                 + EVP_MAX_IV_LENGTH];
2095                         int             padl, outl = sizeof(epms);
2096
2097                         EVP_CIPHER_CTX_init(&ciph_ctx);
2098
2099 #ifdef KSSL_DEBUG
2100                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2101                                 alg_k, SSL_kKRB5);
2102 #endif  /* KSSL_DEBUG */
2103
2104                         authp = NULL;
2105 #ifdef KRB5SENDAUTH
2106                         if (KRB5SENDAUTH)  authp = &authenticator;
2107 #endif  /* KRB5SENDAUTH */
2108
2109                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2110                                 &kssl_err);
2111                         enc = kssl_map_enc(kssl_ctx->enctype);
2112                         if (enc == NULL)
2113                             goto err;
2114 #ifdef KSSL_DEBUG
2115                         {
2116                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2117                         if (krb5rc && kssl_err.text)
2118                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2119                         }
2120 #endif  /* KSSL_DEBUG */
2121
2122                         if (krb5rc)
2123                                 {
2124                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2125                                                 SSL_AD_HANDSHAKE_FAILURE);
2126                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2127                                                 kssl_err.reason);
2128                                 goto err;
2129                                 }
2130
2131                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2132                         **  in place of RFC 2712 KerberosWrapper, as in:
2133                         **
2134                         **  Send ticket (copy to *p, set n = length)
2135                         **  n = krb5_ap_req.length;
2136                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2137                         **  if (krb5_ap_req.data)
2138                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2139                         **
2140                         **  Now using real RFC 2712 KerberosWrapper
2141                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2142                         **  Note: 2712 "opaque" types are here replaced
2143                         **  with a 2-byte length followed by the value.
2144                         **  Example:
2145                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2146                         **  Where "xx xx" = length bytes.  Shown here with
2147                         **  optional authenticator omitted.
2148                         */
2149
2150                         /*  KerberosWrapper.Ticket              */
2151                         s2n(enc_ticket->length,p);
2152                         memcpy(p, enc_ticket->data, enc_ticket->length);
2153                         p+= enc_ticket->length;
2154                         n = enc_ticket->length + 2;
2155
2156                         /*  KerberosWrapper.Authenticator       */
2157                         if (authp  &&  authp->length)
2158                                 {
2159                                 s2n(authp->length,p);
2160                                 memcpy(p, authp->data, authp->length);
2161                                 p+= authp->length;
2162                                 n+= authp->length + 2;
2163
2164                                 free(authp->data);
2165                                 authp->data = NULL;
2166                                 authp->length = 0;
2167                                 }
2168                         else
2169                                 {
2170                                 s2n(0,p);/*  null authenticator length  */
2171                                 n+=2;
2172                                 }
2173
2174                             tmp_buf[0]=s->client_version>>8;
2175                             tmp_buf[1]=s->client_version&0xff;
2176                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2177                                 goto err;
2178
2179                         /*  20010420 VRS.  Tried it this way; failed.
2180                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2181                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2182                         **                              kssl_ctx->length);
2183                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2184                         */
2185
2186                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2187                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2188                                 kssl_ctx->key,iv);
2189                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2190                                 sizeof tmp_buf);
2191                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2192                         outl += padl;
2193                         if (outl > (int)sizeof epms)
2194                                 {
2195                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2196                                 goto err;
2197                                 }
2198                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2199
2200                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2201                         s2n(outl,p);
2202                         memcpy(p, epms, outl);
2203                         p+=outl;
2204                         n+=outl + 2;
2205
2206                         s->session->master_key_length=
2207                                 s->method->ssl3_enc->generate_master_secret(s,
2208                                         s->session->master_key,
2209                                         tmp_buf, sizeof tmp_buf);
2210
2211                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2212                         OPENSSL_cleanse(epms, outl);
2213                         }
2214 #endif
2215 #ifndef OPENSSL_NO_DH
2216                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2217                         {
2218                         DH *dh_srvr,*dh_clnt;
2219
2220                         if (s->session->sess_cert == NULL)
2221                                 {
2222                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2223                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2224                                 goto err;
2225                                 }
2226
2227                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2228                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2229                         else
2230                                 {
2231                                 /* we get them from the cert */
2232                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2233                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2234                                 goto err;
2235                                 }
2236
2237                         /* generate a new random key */
2238                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2239                                 {
2240                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2241                                 goto err;
2242                                 }
2243                         if (!DH_generate_key(dh_clnt))
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2246                                 goto err;
2247                                 }
2248
2249                         /* use the 'p' output buffer for the DH key, but
2250                          * make sure to clear it out afterwards */
2251
2252                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2253
2254                         if (n <= 0)
2255                                 {
2256                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2257                                 goto err;
2258                                 }
2259
2260                         /* generate master key from the result */
2261                         s->session->master_key_length=
2262                                 s->method->ssl3_enc->generate_master_secret(s,
2263                                         s->session->master_key,p,n);
2264                         /* clean up */
2265                         memset(p,0,n);
2266
2267                         /* send off the data */
2268                         n=BN_num_bytes(dh_clnt->pub_key);
2269                         s2n(n,p);
2270                         BN_bn2bin(dh_clnt->pub_key,p);
2271                         n+=2;
2272
2273                         DH_free(dh_clnt);
2274
2275                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2276                         }
2277 #endif
2278
2279 #ifndef OPENSSL_NO_ECDH
2280                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2281                         {
2282                         const EC_GROUP *srvr_group = NULL;
2283                         EC_KEY *tkey;
2284                         int ecdh_clnt_cert = 0;
2285                         int field_size = 0;
2286
2287                         /* Did we send out the client's
2288                          * ECDH share for use in premaster
2289                          * computation as part of client certificate?
2290                          * If so, set ecdh_clnt_cert to 1.
2291                          */
2292                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2293                                 {
2294                                 /* XXX: For now, we do not support client
2295                                  * authentication using ECDH certificates.
2296                                  * To add such support, one needs to add
2297                                  * code that checks for appropriate
2298                                  * conditions and sets ecdh_clnt_cert to 1.
2299                                  * For example, the cert have an ECC
2300                                  * key on the same curve as the server's
2301                                  * and the key should be authorized for
2302                                  * key agreement.
2303                                  *
2304                                  * One also needs to add code in ssl3_connect
2305                                  * to skip sending the certificate verify
2306                                  * message.
2307                                  *
2308                                  * if ((s->cert->key->privatekey != NULL) &&
2309                                  *     (s->cert->key->privatekey->type ==
2310                                  *      EVP_PKEY_EC) && ...)
2311                                  * ecdh_clnt_cert = 1;
2312                                  */
2313                                 }
2314
2315                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2316                                 {
2317                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2318                                 }
2319                         else
2320                                 {
2321                                 /* Get the Server Public Key from Cert */
2322                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2323                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2324                                 if ((srvr_pub_pkey == NULL) ||
2325                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2326                                     (srvr_pub_pkey->pkey.ec == NULL))
2327                                         {
2328                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2329                                             ERR_R_INTERNAL_ERROR);
2330                                         goto err;
2331                                         }
2332
2333                                 tkey = srvr_pub_pkey->pkey.ec;
2334                                 }
2335
2336                         srvr_group   = EC_KEY_get0_group(tkey);
2337                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2338
2339                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2340                                 {
2341                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2342                                     ERR_R_INTERNAL_ERROR);
2343                                 goto err;
2344                                 }
2345
2346                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2347                                 {
2348                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2349                                 goto err;
2350                                 }
2351
2352                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2353                                 {
2354                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2355                                 goto err;
2356                                 }
2357                         if (ecdh_clnt_cert)
2358                                 {
2359                                 /* Reuse key info from our certificate
2360                                  * We only need our private key to perform
2361                                  * the ECDH computation.
2362                                  */
2363                                 const BIGNUM *priv_key;
2364                                 tkey = s->cert->key->privatekey->pkey.ec;
2365                                 priv_key = EC_KEY_get0_private_key(tkey);
2366                                 if (priv_key == NULL)
2367                                         {
2368                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2369                                         goto err;
2370                                         }
2371                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2372                                         {
2373                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2374                                         goto err;
2375                                         }
2376                                 }
2377                         else
2378                                 {
2379                                 /* Generate a new ECDH key pair */
2380                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2381                                         {
2382                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2383                                         goto err;
2384                                         }
2385                                 }
2386
2387                         /* use the 'p' output buffer for the ECDH key, but
2388                          * make sure to clear it out afterwards
2389                          */
2390
2391                         field_size = EC_GROUP_get_degree(srvr_group);
2392                         if (field_size <= 0)
2393                                 {
2394                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2395                                        ERR_R_ECDH_LIB);
2396                                 goto err;
2397                                 }
2398                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2399                         if (n <= 0)
2400                                 {
2401                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2402                                        ERR_R_ECDH_LIB);
2403                                 goto err;
2404                                 }
2405
2406                         /* generate master key from the result */
2407                         s->session->master_key_length = s->method->ssl3_enc \
2408                             -> generate_master_secret(s,
2409                                 s->session->master_key,
2410                                 p, n);
2411
2412                         memset(p, 0, n); /* clean up */
2413
2414                         if (ecdh_clnt_cert)
2415                                 {
2416                                 /* Send empty client key exch message */
2417                                 n = 0;
2418                                 }
2419                         else
2420                                 {
2421                                 /* First check the size of encoding and
2422                                  * allocate memory accordingly.
2423                                  */
2424                                 encoded_pt_len =
2425                                     EC_POINT_point2oct(srvr_group,
2426                                         EC_KEY_get0_public_key(clnt_ecdh),
2427                                         POINT_CONVERSION_UNCOMPRESSED,
2428                                         NULL, 0, NULL);
2429
2430                                 encodedPoint = (unsigned char *)
2431                                     OPENSSL_malloc(encoded_pt_len *
2432                                         sizeof(unsigned char));
2433                                 bn_ctx = BN_CTX_new();
2434                                 if ((encodedPoint == NULL) ||
2435                                     (bn_ctx == NULL))
2436                                         {
2437                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2438                                         goto err;
2439                                         }
2440
2441                                 /* Encode the public key */
2442                                 n = EC_POINT_point2oct(srvr_group,
2443                                     EC_KEY_get0_public_key(clnt_ecdh),
2444                                     POINT_CONVERSION_UNCOMPRESSED,
2445                                     encodedPoint, encoded_pt_len, bn_ctx);
2446
2447                                 *p = n; /* length of encoded point */
2448                                 /* Encoded point will be copied here */
2449                                 p += 1;
2450                                 /* copy the point */
2451                                 memcpy((unsigned char *)p, encodedPoint, n);
2452                                 /* increment n to account for length field */
2453                                 n += 1;
2454                                 }
2455
2456                         /* Free allocated memory */
2457                         BN_CTX_free(bn_ctx);
2458                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2459                         if (clnt_ecdh != NULL)
2460                                  EC_KEY_free(clnt_ecdh);
2461                         EVP_PKEY_free(srvr_pub_pkey);
2462                         }
2463 #endif /* !OPENSSL_NO_ECDH */
2464                 else if (alg_k & SSL_kGOST)
2465                         {
2466                         /* GOST key exchange message creation */
2467                         EVP_PKEY_CTX *pkey_ctx;
2468                         X509 *peer_cert;
2469                         size_t msglen;
2470                         unsigned int md_len;
2471                         int keytype;
2472                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2473                         EVP_MD_CTX *ukm_hash;
2474                         EVP_PKEY *pub_key;
2475
2476                         /* Get server sertificate PKEY and create ctx from it */
2477                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2478                         if (!peer_cert)
2479                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2480                         if (!peer_cert)         {
2481                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2482                                         goto err;
2483                                 }
2484
2485                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2486                         /* If we have send a certificate, and certificate key
2487
2488                          * parameters match those of server certificate, use
2489                          * certificate key for key exchange
2490                          */
2491
2492                          /* Otherwise, generate ephemeral key pair */
2493
2494                         EVP_PKEY_encrypt_init(pkey_ctx);
2495                           /* Generate session key */
2496                     RAND_bytes(premaster_secret,32);
2497                         /* If we have client certificate, use its secret as peer key */
2498                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2499                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2500                                         /* If there was an error - just ignore it. Ephemeral key
2501                                         * would be used
2502                                         */
2503                                         ERR_clear_error();
2504                                 }
2505                         }
2506                         /* Compute shared IV and store it in algorithm-specific
2507                          * context data */
2508                         ukm_hash = EVP_MD_CTX_create();
2509                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2510                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2511                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2512                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2513                         EVP_MD_CTX_destroy(ukm_hash);
2514                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2515                                 8,shared_ukm)<0) {
2516                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2517                                                 SSL_R_LIBRARY_BUG);
2518                                         goto err;
2519                                 }
2520                         /* Make GOST keytransport blob message */
2521                         /*Encapsulate it into sequence */
2522                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2523                         msglen=255;
2524                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2525                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2526                                         SSL_R_LIBRARY_BUG);
2527                                 goto err;
2528                         }
2529                         if (msglen >= 0x80)
2530                                 {
2531                                 *(p++)=0x81;
2532                                 *(p++)= msglen & 0xff;
2533                                 n=msglen+3;
2534                                 }
2535                         else
2536                                 {
2537                                 *(p++)= msglen & 0xff;
2538                                 n=msglen+2;
2539                                 }
2540                         memcpy(p, tmp, msglen);
2541                         /* Check if pubkey from client certificate was used */
2542                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2543                                 {
2544                                 /* Set flag "skip certificate verify" */
2545                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2546                                 }
2547                         EVP_PKEY_CTX_free(pkey_ctx);
2548                         s->session->master_key_length=
2549                                 s->method->ssl3_enc->generate_master_secret(s,
2550                                         s->session->master_key,premaster_secret,32);
2551                         EVP_PKEY_free(pub_key);
2552
2553                         }
2554 #ifndef OPENSSL_NO_PSK
2555                 else if (alg_k & SSL_kPSK)
2556                         {
2557                         char identity[PSK_MAX_IDENTITY_LEN];
2558                         unsigned char *t = NULL;
2559                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2560                         unsigned int pre_ms_len = 0, psk_len = 0;
2561                         int psk_err = 1;
2562
2563                         n = 0;
2564                         if (s->psk_client_callback == NULL)
2565                                 {
2566                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2567                                         SSL_R_PSK_NO_CLIENT_CB);
2568                                 goto err;
2569                                 }
2570
2571                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2572                                 identity, PSK_MAX_IDENTITY_LEN,
2573                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2574                         if (psk_len > PSK_MAX_PSK_LEN)
2575                                 {
2576                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2577                                         ERR_R_INTERNAL_ERROR);
2578                                 goto psk_err;
2579                                 }
2580                         else if (psk_len == 0)
2581                                 {
2582                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2583                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2584                                 goto psk_err;
2585                                 }
2586
2587                         /* create PSK pre_master_secret */
2588                         pre_ms_len = 2+psk_len+2+psk_len;
2589                         t = psk_or_pre_ms;
2590                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2591                         s2n(psk_len, t);
2592                         memset(t, 0, psk_len);
2593                         t+=psk_len;
2594                         s2n(psk_len, t);
2595
2596                         if (s->session->psk_identity_hint != NULL)
2597                                 OPENSSL_free(s->session->psk_identity_hint);
2598                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2599                         if (s->ctx->psk_identity_hint != NULL &&
2600                                 s->session->psk_identity_hint == NULL)
2601                                 {
2602                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2603                                         ERR_R_MALLOC_FAILURE);
2604                                 goto psk_err;
2605                                 }
2606
2607                         if (s->session->psk_identity != NULL)
2608                                 OPENSSL_free(s->session->psk_identity);
2609                         s->session->psk_identity = BUF_strdup(identity);
2610                         if (s->session->psk_identity == NULL)
2611                                 {
2612                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2613                                         ERR_R_MALLOC_FAILURE);
2614                                 goto psk_err;
2615                                 }
2616
2617                         s->session->master_key_length =
2618                                 s->method->ssl3_enc->generate_master_secret(s,
2619                                         s->session->master_key,
2620                                         psk_or_pre_ms, pre_ms_len);
2621                         n = strlen(identity);
2622                         s2n(n, p);
2623                         memcpy(p, identity, n);
2624                         n+=2;
2625                         psk_err = 0;
2626                 psk_err:
2627                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2628                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2629                         if (psk_err != 0)
2630                                 {
2631                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2632                                 goto err;
2633                                 }
2634                         }
2635 #endif
2636                 else
2637                         {
2638                         ssl3_send_alert(s, SSL3_AL_FATAL,
2639                             SSL_AD_HANDSHAKE_FAILURE);
2640                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2641                             ERR_R_INTERNAL_ERROR);
2642                         goto err;
2643                         }
2644
2645                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2646                 l2n3(n,d);
2647
2648                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2649                 /* number of bytes to write */
2650                 s->init_num=n+4;
2651                 s->init_off=0;
2652                 }
2653
2654         /* SSL3_ST_CW_KEY_EXCH_B */
2655         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2656 err:
2657 #ifndef OPENSSL_NO_ECDH
2658         BN_CTX_free(bn_ctx);
2659         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2660         if (clnt_ecdh != NULL)
2661                 EC_KEY_free(clnt_ecdh);
2662         EVP_PKEY_free(srvr_pub_pkey);
2663 #endif
2664         return(-1);
2665         }
2666
2667 int ssl3_send_client_verify(SSL *s)
2668         {
2669         unsigned char *p,*d;
2670         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2671         EVP_PKEY *pkey;
2672         EVP_PKEY_CTX *pctx=NULL;
2673 #ifndef OPENSSL_NO_RSA
2674         unsigned u=0;
2675 #endif
2676         unsigned long n;
2677         int j;
2678
2679         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2680                 {
2681                 d=(unsigned char *)s->init_buf->data;
2682                 p= &(d[4]);
2683                 pkey=s->cert->key->privatekey;
2684 /* Create context from key and test if sha1 is allowed as digest */
2685                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2686                 EVP_PKEY_sign_init(pctx);
2687                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2688                         {
2689                         s->method->ssl3_enc->cert_verify_mac(s,
2690                                                 NID_sha1,
2691                                                 &(data[MD5_DIGEST_LENGTH]));
2692                         }
2693                 else
2694                         {
2695                         ERR_clear_error();
2696                         }
2697 #ifndef OPENSSL_NO_RSA
2698                 if (pkey->type == EVP_PKEY_RSA)
2699                         {
2700                         s->method->ssl3_enc->cert_verify_mac(s,
2701                                 NID_md5,
2702                                 &(data[0]));
2703                         if (RSA_sign(NID_md5_sha1, data,
2704                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2705                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2706                                 {
2707                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2708                                 goto err;
2709                                 }
2710                         s2n(u,p);
2711                         n=u+2;
2712                         }
2713                 else
2714 #endif
2715 #ifndef OPENSSL_NO_DSA
2716                         if (pkey->type == EVP_PKEY_DSA)
2717                         {
2718                         if (!DSA_sign(pkey->save_type,
2719                                 &(data[MD5_DIGEST_LENGTH]),
2720                                 SHA_DIGEST_LENGTH,&(p[2]),
2721                                 (unsigned int *)&j,pkey->pkey.dsa))
2722                                 {
2723                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2724                                 goto err;
2725                                 }
2726                         s2n(j,p);
2727                         n=j+2;
2728                         }
2729                 else
2730 #endif
2731 #ifndef OPENSSL_NO_ECDSA
2732                         if (pkey->type == EVP_PKEY_EC)
2733                         {
2734                         if (!ECDSA_sign(pkey->save_type,
2735                                 &(data[MD5_DIGEST_LENGTH]),
2736                                 SHA_DIGEST_LENGTH,&(p[2]),
2737                                 (unsigned int *)&j,pkey->pkey.ec))
2738                                 {
2739                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2740                                     ERR_R_ECDSA_LIB);
2741                                 goto err;
2742                                 }
2743                         s2n(j,p);
2744                         n=j+2;
2745                         }
2746                 else
2747 #endif
2748                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2749                 {
2750                 unsigned char signbuf[64];
2751                 int i;
2752                 size_t sigsize=64;
2753                 s->method->ssl3_enc->cert_verify_mac(s,
2754                         NID_id_GostR3411_94,
2755                         data);
2756                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2757                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2758                         ERR_R_INTERNAL_ERROR);
2759                         goto err;
2760                 }
2761                 for (i=63,j=0; i>=0; j++, i--) {
2762                         p[2+j]=signbuf[i];
2763                 }
2764                 s2n(j,p);
2765                 n=j+2;
2766                 }
2767                 else
2768                 {
2769                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2770                         goto err;
2771                 }
2772                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2773                 l2n3(n,d);
2774
2775                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2776                 s->init_num=(int)n+4;
2777                 s->init_off=0;
2778                 }
2779         EVP_PKEY_CTX_free(pctx);
2780         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2781 err:
2782         EVP_PKEY_CTX_free(pctx);
2783         return(-1);
2784         }
2785
2786 int ssl3_send_client_certificate(SSL *s)
2787         {
2788         X509 *x509=NULL;
2789         EVP_PKEY *pkey=NULL;
2790         int i;
2791         unsigned long l;
2792
2793         if (s->state == SSL3_ST_CW_CERT_A)
2794                 {
2795                 if ((s->cert == NULL) ||
2796                         (s->cert->key->x509 == NULL) ||
2797                         (s->cert->key->privatekey == NULL))
2798                         s->state=SSL3_ST_CW_CERT_B;
2799                 else
2800                         s->state=SSL3_ST_CW_CERT_C;
2801                 }
2802
2803         /* We need to get a client cert */
2804         if (s->state == SSL3_ST_CW_CERT_B)
2805                 {
2806                 /* If we get an error, we need to
2807                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2808                  * We then get retied later */
2809                 i=0;
2810                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2811                 if (i < 0)
2812                         {
2813                         s->rwstate=SSL_X509_LOOKUP;
2814                         return(-1);
2815                         }
2816                 s->rwstate=SSL_NOTHING;
2817                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2818                         {
2819                         s->state=SSL3_ST_CW_CERT_B;
2820                         if (    !SSL_use_certificate(s,x509) ||
2821                                 !SSL_use_PrivateKey(s,pkey))
2822                                 i=0;
2823                         }
2824                 else if (i == 1)
2825                         {
2826                         i=0;
2827                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2828                         }
2829
2830                 if (x509 != NULL) X509_free(x509);
2831                 if (pkey != NULL) EVP_PKEY_free(pkey);
2832                 if (i == 0)
2833                         {
2834                         if (s->version == SSL3_VERSION)
2835                                 {
2836                                 s->s3->tmp.cert_req=0;
2837                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2838                                 return(1);
2839                                 }
2840                         else
2841                                 {
2842                                 s->s3->tmp.cert_req=2;
2843                                 }
2844                         }
2845
2846                 /* Ok, we have a cert */
2847                 s->state=SSL3_ST_CW_CERT_C;
2848                 }
2849
2850         if (s->state == SSL3_ST_CW_CERT_C)
2851                 {
2852                 s->state=SSL3_ST_CW_CERT_D;
2853                 l=ssl3_output_cert_chain(s,
2854                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2855                 s->init_num=(int)l;
2856                 s->init_off=0;
2857                 }
2858         /* SSL3_ST_CW_CERT_D */
2859         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2860         }
2861
2862 #define has_bits(i,m)   (((i)&(m)) == (m))
2863
2864 int ssl3_check_cert_and_algorithm(SSL *s)
2865         {
2866         int i,idx;
2867         long alg_k,alg_a;
2868         EVP_PKEY *pkey=NULL;
2869         SESS_CERT *sc;
2870 #ifndef OPENSSL_NO_RSA
2871         RSA *rsa;
2872 #endif
2873 #ifndef OPENSSL_NO_DH
2874         DH *dh;
2875 #endif
2876
2877         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2878         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2879
2880         /* we don't have a certificate */
2881         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2882                 return(1);
2883
2884         sc=s->session->sess_cert;
2885         if (sc == NULL)
2886                 {
2887                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2888                 goto err;
2889                 }
2890
2891 #ifndef OPENSSL_NO_RSA
2892         rsa=s->session->sess_cert->peer_rsa_tmp;
2893 #endif
2894 #ifndef OPENSSL_NO_DH
2895         dh=s->session->sess_cert->peer_dh_tmp;
2896 #endif
2897
2898         /* This is the passed certificate */
2899
2900         idx=sc->peer_cert_type;
2901 #ifndef OPENSSL_NO_ECDH
2902         if (idx == SSL_PKEY_ECC)
2903                 {
2904                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2905                     s->s3->tmp.new_cipher) == 0)
2906                         { /* check failed */
2907                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2908                         goto f_err;
2909                         }
2910                 else
2911                         {
2912                         return 1;
2913                         }
2914                 }
2915 #endif
2916         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2917         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2918         EVP_PKEY_free(pkey);
2919
2920
2921         /* Check that we have a certificate if we require one */
2922         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2923                 {
2924                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2925                 goto f_err;
2926                 }
2927 #ifndef OPENSSL_NO_DSA
2928         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2929                 {
2930                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2931                 goto f_err;
2932                 }
2933 #endif
2934 #ifndef OPENSSL_NO_RSA
2935         if ((alg_k & SSL_kRSA) &&
2936                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2937                 {
2938                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2939                 goto f_err;
2940                 }
2941 #endif
2942 #ifndef OPENSSL_NO_DH
2943         if ((alg_k & SSL_kEDH) &&
2944                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2945                 {
2946                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2947                 goto f_err;
2948                 }
2949         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2950                 {
2951                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2952                 goto f_err;
2953                 }
2954 #ifndef OPENSSL_NO_DSA
2955         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2956                 {
2957                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2958                 goto f_err;
2959                 }
2960 #endif
2961 #endif
2962
2963         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2964                 {
2965 #ifndef OPENSSL_NO_RSA
2966                 if (alg_k & SSL_kRSA)
2967                         {
2968                         if (rsa == NULL
2969                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2970                                 {
2971                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2972                                 goto f_err;
2973                                 }
2974                         }
2975                 else
2976 #endif
2977 #ifndef OPENSSL_NO_DH
2978                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2979                             {
2980                             if (dh == NULL
2981                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2982                                 {
2983                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2984                                 goto f_err;
2985                                 }
2986                         }
2987                 else
2988 #endif
2989                         {
2990                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2991                         goto f_err;
2992                         }
2993                 }
2994         return(1);
2995 f_err:
2996         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2997 err:
2998         return(0);
2999         }
3000
3001 /* Check to see if handshake is full or resumed. Usually this is just a
3002  * case of checking to see if a cache hit has occurred. In the case of
3003  * session tickets we have to check the next message to be sure.
3004  */
3005
3006 #ifndef OPENSSL_NO_TLSEXT
3007 int ssl3_check_finished(SSL *s)
3008         {
3009         int ok;
3010         long n;
3011         /* If we have no ticket it cannot be a resumed session. */
3012         if (!s->session->tlsext_tick)
3013                 return 1;
3014         /* this function is called when we really expect a Certificate
3015          * message, so permit appropriate message length */
3016         n=s->method->ssl_get_message(s,
3017                 SSL3_ST_CR_CERT_A,
3018                 SSL3_ST_CR_CERT_B,
3019                 -1,
3020                 s->max_cert_list,
3021                 &ok);
3022         if (!ok) return((int)n);
3023         s->s3->tmp.reuse_message = 1;
3024         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3025                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3026                 return 2;
3027
3028         return 1;
3029         }
3030 #endif
3031
3032 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3033         {
3034         int i = 0;
3035 #ifndef OPENSSL_NO_ENGINE
3036         if (s->ctx->client_cert_engine)
3037                 {
3038                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3039                                                 SSL_get_client_CA_list(s),
3040                                                 px509, ppkey, NULL, NULL, NULL);
3041                 if (i != 0)
3042                         return i;
3043                 }
3044 #endif
3045         if (s->ctx->client_cert_cb)
3046                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3047         return i;
3048         }