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                 if (!(s->options &
 870                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 871                         {
 872                         al=SSL_AD_ILLEGAL_PARAMETER;
 873                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 874                         goto f_err;
 875                         }
 876                 }
 877         s->s3->tmp.new_cipher=c;
 878         if (!ssl3_digest_cached_records(s))
 879                 goto f_err;
 880
 881         /* lets get the compression algorithm */
 882         /* COMPRESSION */
 883 #ifdef OPENSSL_NO_COMP
 884         if (*(p++) != 0)
 885                 {
 886                 al=SSL_AD_ILLEGAL_PARAMETER;
 887                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 888                 goto f_err;
 889                 }
 890         /* If compression is disabled we'd better not try to resume a session
 891          * using compression.
 892          */
 893         if (s->session->compress_meth != 0)
 894                 {
 895                 al=SSL_AD_INTERNAL_ERROR;
 896                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 897                 goto f_err;
 898                 }
 899 #else
 900         j= *(p++);
 901         if (s->hit && j != s->session->compress_meth)
 902                 {
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 905                 goto f_err;
 906                 }
 907         if (j == 0)
 908                 comp=NULL;
 909         else if (s->options & SSL_OP_NO_COMPRESSION)
 910                 {
 911                 al=SSL_AD_ILLEGAL_PARAMETER;
 912                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 913                 goto f_err;
 914                 }
 915         else
 916                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 917
 918         if ((j != 0) && (comp == NULL))
 919                 {
 920                 al=SSL_AD_ILLEGAL_PARAMETER;
 921                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 922                 goto f_err;
 923                 }
 924         else
 925                 {
 926                 s->s3->tmp.new_compression=comp;
 927                 }
 928 #endif
 929
 930 #ifndef OPENSSL_NO_TLSEXT
 931         /* TLS extensions*/
 932         if (s->version >= SSL3_VERSION)
 933                 {
 934                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 935                         {
 936                         /* 'al' set by ssl_parse_serverhello_tlsext */
 937                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 938                         goto f_err;
 939                         }
 940                 if (ssl_check_serverhello_tlsext(s) <= 0)
 941                         {
 942                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 943                                 goto err;
 944                         }
 945                 }
 946 #endif
 947
 948         if (p != (d+n))
 949                 {
 950                 /* wrong packet length */
 951                 al=SSL_AD_DECODE_ERROR;
 952                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 953                 goto err;
 954                 }
 955
 956         return(1);
 957 f_err:
 958         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 959 err:
 960         return(-1);
 961         }
 962
 963 int ssl3_get_server_certificate(SSL *s)
 964         {
 965         int al,i,ok,ret= -1;
 966         unsigned long n,nc,llen,l;
 967         X509 *x=NULL;
 968         const unsigned char *q,*p;
 969         unsigned char *d;
 970         STACK_OF(X509) *sk=NULL;
 971         SESS_CERT *sc;
 972         EVP_PKEY *pkey=NULL;
 973         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 974
 975         n=s->method->ssl_get_message(s,
 976                 SSL3_ST_CR_CERT_A,
 977                 SSL3_ST_CR_CERT_B,
 978                 -1,
 979                 s->max_cert_list,
 980                 &ok);
 981
 982         if (!ok) return((int)n);
 983
 984         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 985                 {
 986                 s->s3->tmp.reuse_message=1;
 987                 return(1);
 988                 }
 989
 990         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 991                 {
 992                 al=SSL_AD_UNEXPECTED_MESSAGE;
 993                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 994                 goto f_err;
 995                 }
 996         p=d=(unsigned char *)s->init_msg;
 997
 998         if ((sk=sk_X509_new_null()) == NULL)
 999                 {
1000                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1001                 goto err;
1002                 }
1003
1004         n2l3(p,llen);
1005         if (llen+3 != n)
1006                 {
1007                 al=SSL_AD_DECODE_ERROR;
1008                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1009                 goto f_err;
1010                 }
1011         for (nc=0; nc<llen; )
1012                 {
1013                 n2l3(p,l);
1014                 if ((l+nc+3) > llen)
1015                         {
1016                         al=SSL_AD_DECODE_ERROR;
1017                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1018                         goto f_err;
1019                         }
1020
1021                 q=p;
1022                 x=d2i_X509(NULL,&q,l);
1023                 if (x == NULL)
1024                         {
1025                         al=SSL_AD_BAD_CERTIFICATE;
1026                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1027                         goto f_err;
1028                         }
1029                 if (q != (p+l))
1030                         {
1031                         al=SSL_AD_DECODE_ERROR;
1032                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1033                         goto f_err;
1034                         }
1035                 if (!sk_X509_push(sk,x))
1036                         {
1037                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1038                         goto err;
1039                         }
1040                 x=NULL;
1041                 nc+=l+3;
1042                 p=q;
1043                 }
1044
1045         i=ssl_verify_cert_chain(s,sk);
1046         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1047 #ifndef OPENSSL_NO_KRB5
1048             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1049                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1050 #endif /* OPENSSL_NO_KRB5 */
1051                 )
1052                 {
1053                 al=ssl_verify_alarm_type(s->verify_result);
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1055                 goto f_err;
1056                 }
1057         ERR_clear_error(); /* but we keep s->verify_result */
1058
1059         sc=ssl_sess_cert_new();
1060         if (sc == NULL) goto err;
1061
1062         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1063         s->session->sess_cert=sc;
1064
1065         sc->cert_chain=sk;
1066         /* Inconsistency alert: cert_chain does include the peer's
1067          * certificate, which we don't include in s3_srvr.c */
1068         x=sk_X509_value(sk,0);
1069         sk=NULL;
1070         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1071
1072         pkey=X509_get_pubkey(x);
1073
1074         /* VRS: allow null cert if auth == KRB5 */
1075         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1076                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1077                     ? 0 : 1;
1078
1079 #ifdef KSSL_DEBUG
1080         printf("pkey,x = %p, %p\n", pkey,x);
1081         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1082         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1083                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1084 #endif    /* KSSL_DEBUG */
1085
1086         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1087                 {
1088                 x=NULL;
1089                 al=SSL3_AL_FATAL;
1090                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1091                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1092                 goto f_err;
1093                 }
1094
1095         i=ssl_cert_type(x,pkey);
1096         if (need_cert && i < 0)
1097                 {
1098                 x=NULL;
1099                 al=SSL3_AL_FATAL;
1100                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1101                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1102                 goto f_err;
1103                 }
1104
1105         if (need_cert)
1106                 {
1107                 sc->peer_cert_type=i;
1108                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1109                 /* Why would the following ever happen?
1110                  * We just created sc a couple of lines ago. */
1111                 if (sc->peer_pkeys[i].x509 != NULL)
1112                         X509_free(sc->peer_pkeys[i].x509);
1113                 sc->peer_pkeys[i].x509=x;
1114                 sc->peer_key= &(sc->peer_pkeys[i]);
1115
1116                 if (s->session->peer != NULL)
1117                         X509_free(s->session->peer);
1118                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1119                 s->session->peer=x;
1120                 }
1121         else
1122                 {
1123                 sc->peer_cert_type=i;
1124                 sc->peer_key= NULL;
1125
1126                 if (s->session->peer != NULL)
1127                         X509_free(s->session->peer);
1128                 s->session->peer=NULL;
1129                 }
1130         s->session->verify_result = s->verify_result;
1131
1132         x=NULL;
1133         ret=1;
1134
1135         if (0)
1136                 {
1137 f_err:
1138                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1139                 }
1140 err:
1141         EVP_PKEY_free(pkey);
1142         X509_free(x);
1143         sk_X509_pop_free(sk,X509_free);
1144         return(ret);
1145         }
1146
1147 int ssl3_get_key_exchange(SSL *s)
1148         {
1149 #ifndef OPENSSL_NO_RSA
1150         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1151 #endif
1152         EVP_MD_CTX md_ctx;
1153         unsigned char *param,*p;
1154         int al,i,j,param_len,ok;
1155         long n,alg_k,alg_a;
1156         EVP_PKEY *pkey=NULL;
1157 #ifndef OPENSSL_NO_RSA
1158         RSA *rsa=NULL;
1159 #endif
1160 #ifndef OPENSSL_NO_DH
1161         DH *dh=NULL;
1162 #endif
1163 #ifndef OPENSSL_NO_ECDH
1164         EC_KEY *ecdh = NULL;
1165         BN_CTX *bn_ctx = NULL;
1166         EC_POINT *srvr_ecpoint = NULL;
1167         int curve_nid = 0;
1168         int encoded_pt_len = 0;
1169 #endif
1170
1171         /* use same message size as in ssl3_get_certificate_request()
1172          * as ServerKeyExchange message may be skipped */
1173         n=s->method->ssl_get_message(s,
1174                 SSL3_ST_CR_KEY_EXCH_A,
1175                 SSL3_ST_CR_KEY_EXCH_B,
1176                 -1,
1177                 s->max_cert_list,
1178                 &ok);
1179         if (!ok) return((int)n);
1180
1181         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1182                 {
1183 #ifndef OPENSSL_NO_PSK
1184                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1185                    omitted if no identity hint is sent. Set
1186                    session->sess_cert anyway to avoid problems
1187                    later.*/
1188                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1189                         {
1190                         s->session->sess_cert=ssl_sess_cert_new();
1191                         if (s->ctx->psk_identity_hint)
1192                                 OPENSSL_free(s->ctx->psk_identity_hint);
1193                         s->ctx->psk_identity_hint = NULL;
1194                         }
1195 #endif
1196                 s->s3->tmp.reuse_message=1;
1197                 return(1);
1198                 }
1199
1200         param=p=(unsigned char *)s->init_msg;
1201         if (s->session->sess_cert != NULL)
1202                 {
1203 #ifndef OPENSSL_NO_RSA
1204                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1205                         {
1206                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1207                         s->session->sess_cert->peer_rsa_tmp=NULL;
1208                         }
1209 #endif
1210 #ifndef OPENSSL_NO_DH
1211                 if (s->session->sess_cert->peer_dh_tmp)
1212                         {
1213                         DH_free(s->session->sess_cert->peer_dh_tmp);
1214                         s->session->sess_cert->peer_dh_tmp=NULL;
1215                         }
1216 #endif
1217 #ifndef OPENSSL_NO_ECDH
1218                 if (s->session->sess_cert->peer_ecdh_tmp)
1219                         {
1220                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1221                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1222                         }
1223 #endif
1224                 }
1225         else
1226                 {
1227                 s->session->sess_cert=ssl_sess_cert_new();
1228                 }
1229
1230         param_len=0;
1231         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1232         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1233         EVP_MD_CTX_init(&md_ctx);
1234
1235 #ifndef OPENSSL_NO_PSK
1236         if (alg_k & SSL_kPSK)
1237                 {
1238                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1239
1240                 al=SSL_AD_HANDSHAKE_FAILURE;
1241                 n2s(p,i);
1242                 param_len=i+2;
1243                 /* Store PSK identity hint for later use, hint is used
1244                  * in ssl3_send_client_key_exchange.  Assume that the
1245                  * maximum length of a PSK identity hint can be as
1246                  * long as the maximum length of a PSK identity. */
1247                 if (i > PSK_MAX_IDENTITY_LEN)
1248                         {
1249                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1250                                 SSL_R_DATA_LENGTH_TOO_LONG);
1251                         goto f_err;
1252                         }
1253                 if (param_len > n)
1254                         {
1255                         al=SSL_AD_DECODE_ERROR;
1256                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1257                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1258                         goto f_err;
1259                         }
1260                 /* If received PSK identity hint contains NULL
1261                  * characters, the hint is truncated from the first
1262                  * NULL. p may not be ending with NULL, so create a
1263                  * NULL-terminated string. */
1264                 memcpy(tmp_id_hint, p, i);
1265                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1266                 if (s->ctx->psk_identity_hint != NULL)
1267                         OPENSSL_free(s->ctx->psk_identity_hint);
1268                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1269                 if (s->ctx->psk_identity_hint == NULL)
1270                         {
1271                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1272                         goto f_err;
1273                         }
1274
1275                 p+=i;
1276                 n-=param_len;
1277                 }
1278         else
1279 #endif /* !OPENSSL_NO_PSK */
1280 #ifndef OPENSSL_NO_RSA
1281         if (alg_k & SSL_kRSA)
1282                 {
1283                 if ((rsa=RSA_new()) == NULL)
1284                         {
1285                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1286                         goto err;
1287                         }
1288                 n2s(p,i);
1289                 param_len=i+2;
1290                 if (param_len > n)
1291                         {
1292                         al=SSL_AD_DECODE_ERROR;
1293                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1294                         goto f_err;
1295                         }
1296                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1297                         {
1298                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1299                         goto err;
1300                         }
1301                 p+=i;
1302
1303                 n2s(p,i);
1304                 param_len+=i+2;
1305                 if (param_len > n)
1306                         {
1307                         al=SSL_AD_DECODE_ERROR;
1308                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1309                         goto f_err;
1310                         }
1311                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1312                         {
1313                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1314                         goto err;
1315                         }
1316                 p+=i;
1317                 n-=param_len;
1318
1319                 /* this should be because we are using an export cipher */
1320                 if (alg_a & SSL_aRSA)
1321                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1322                 else
1323                         {
1324                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1325                         goto err;
1326                         }
1327                 s->session->sess_cert->peer_rsa_tmp=rsa;
1328                 rsa=NULL;
1329                 }
1330 #else /* OPENSSL_NO_RSA */
1331         if (0)
1332                 ;
1333 #endif
1334 #ifndef OPENSSL_NO_DH
1335         else if (alg_k & SSL_kEDH)
1336                 {
1337                 if ((dh=DH_new()) == NULL)
1338                         {
1339                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1340                         goto err;
1341                         }
1342                 n2s(p,i);
1343                 param_len=i+2;
1344                 if (param_len > n)
1345                         {
1346                         al=SSL_AD_DECODE_ERROR;
1347                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1348                         goto f_err;
1349                         }
1350                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1351                         {
1352                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1353                         goto err;
1354                         }
1355                 p+=i;
1356
1357                 n2s(p,i);
1358                 param_len+=i+2;
1359                 if (param_len > n)
1360                         {
1361                         al=SSL_AD_DECODE_ERROR;
1362                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1363                         goto f_err;
1364                         }
1365                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1366                         {
1367                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1368                         goto err;
1369                         }
1370                 p+=i;
1371
1372                 n2s(p,i);
1373                 param_len+=i+2;
1374                 if (param_len > n)
1375                         {
1376                         al=SSL_AD_DECODE_ERROR;
1377                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1378                         goto f_err;
1379                         }
1380                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1381                         {
1382                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1383                         goto err;
1384                         }
1385                 p+=i;
1386                 n-=param_len;
1387
1388 #ifndef OPENSSL_NO_RSA
1389                 if (alg_a & SSL_aRSA)
1390                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1391 #else
1392                 if (0)
1393                         ;
1394 #endif
1395 #ifndef OPENSSL_NO_DSA
1396                 else if (alg_a & SSL_aDSS)
1397                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1398 #endif
1399                 /* else anonymous DH, so no certificate or pkey. */
1400
1401                 s->session->sess_cert->peer_dh_tmp=dh;
1402                 dh=NULL;
1403                 }
1404         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1405                 {
1406                 al=SSL_AD_ILLEGAL_PARAMETER;
1407                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1408                 goto f_err;
1409                 }
1410 #endif /* !OPENSSL_NO_DH */
1411
1412 #ifndef OPENSSL_NO_ECDH
1413         else if (alg_k & SSL_kEECDH)
1414                 {
1415                 EC_GROUP *ngroup;
1416                 const EC_GROUP *group;
1417
1418                 if ((ecdh=EC_KEY_new()) == NULL)
1419                         {
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1421                         goto err;
1422                         }
1423
1424                 /* Extract elliptic curve parameters and the
1425                  * server's ephemeral ECDH public key.
1426                  * Keep accumulating lengths of various components in
1427                  * param_len and make sure it never exceeds n.
1428                  */
1429
1430                 /* XXX: For now we only support named (not generic) curves
1431                  * and the ECParameters in this case is just three bytes.
1432                  */
1433                 param_len=3;
1434                 if ((param_len > n) ||
1435                     (*p != NAMED_CURVE_TYPE) ||
1436                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1437                         {
1438                         al=SSL_AD_INTERNAL_ERROR;
1439                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1440                         goto f_err;
1441                         }
1442
1443                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1444                 if (ngroup == NULL)
1445                         {
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1447                         goto err;
1448                         }
1449                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1450                         {
1451                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1452                         goto err;
1453                         }
1454                 EC_GROUP_free(ngroup);
1455
1456                 group = EC_KEY_get0_group(ecdh);
1457
1458                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1459                     (EC_GROUP_get_degree(group) > 163))
1460                         {
1461                         al=SSL_AD_EXPORT_RESTRICTION;
1462                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1463                         goto f_err;
1464                         }
1465
1466                 p+=3;
1467
1468                 /* Next, get the encoded ECPoint */
1469                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1470                     ((bn_ctx = BN_CTX_new()) == NULL))
1471                         {
1472                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1473                         goto err;
1474                         }
1475
1476                 encoded_pt_len = *p;  /* length of encoded point */
1477                 p+=1;
1478                 param_len += (1 + encoded_pt_len);
1479                 if ((param_len > n) ||
1480                     (EC_POINT_oct2point(group, srvr_ecpoint,
1481                         p, encoded_pt_len, bn_ctx) == 0))
1482                         {
1483                         al=SSL_AD_DECODE_ERROR;
1484                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1485                         goto f_err;
1486                         }
1487
1488                 n-=param_len;
1489                 p+=encoded_pt_len;
1490
1491                 /* The ECC/TLS specification does not mention
1492                  * the use of DSA to sign ECParameters in the server
1493                  * key exchange message. We do support RSA and ECDSA.
1494                  */
1495                 if (0) ;
1496 #ifndef OPENSSL_NO_RSA
1497                 else if (alg_a & SSL_aRSA)
1498                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1499 #endif
1500 #ifndef OPENSSL_NO_ECDSA
1501                 else if (alg_a & SSL_aECDSA)
1502                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1503 #endif
1504                 /* else anonymous ECDH, so no certificate or pkey. */
1505                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1506                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1507                 ecdh=NULL;
1508                 BN_CTX_free(bn_ctx);
1509                 EC_POINT_free(srvr_ecpoint);
1510                 srvr_ecpoint = NULL;
1511                 }
1512         else if (alg_k)
1513                 {
1514                 al=SSL_AD_UNEXPECTED_MESSAGE;
1515                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1516                 goto f_err;
1517                 }
1518 #endif /* !OPENSSL_NO_ECDH */
1519
1520
1521         /* p points to the next byte, there are 'n' bytes left */
1522
1523         /* if it was signed, check the signature */
1524         if (pkey != NULL)
1525                 {
1526                 n2s(p,i);
1527                 n-=2;
1528                 j=EVP_PKEY_size(pkey);
1529
1530                 if ((i != n) || (n > j) || (n <= 0))
1531                         {
1532                         /* wrong packet length */
1533                         al=SSL_AD_DECODE_ERROR;
1534                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1535                         goto f_err;
1536                         }
1537
1538 #ifndef OPENSSL_NO_RSA
1539                 if (pkey->type == EVP_PKEY_RSA)
1540                         {
1541                         int num;
1542
1543                         j=0;
1544                         q=md_buf;
1545                         for (num=2; num > 0; num--)
1546                                 {
1547                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1548                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1549                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1550                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1551                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1552                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1553                                 q+=i;
1554                                 j+=i;
1555                                 }
1556                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1557                                                                 pkey->pkey.rsa);
1558                         if (i < 0)
1559                                 {
1560                                 al=SSL_AD_DECRYPT_ERROR;
1561                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1562                                 goto f_err;
1563                                 }
1564                         if (i == 0)
1565                                 {
1566                                 /* bad signature */
1567                                 al=SSL_AD_DECRYPT_ERROR;
1568                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1569                                 goto f_err;
1570                                 }
1571                         }
1572                 else
1573 #endif
1574 #ifndef OPENSSL_NO_DSA
1575                         if (pkey->type == EVP_PKEY_DSA)
1576                         {
1577                         /* lets do DSS */
1578                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1579                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1580                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1581                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1582                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1583                                 {
1584                                 /* bad signature */
1585                                 al=SSL_AD_DECRYPT_ERROR;
1586                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1587                                 goto f_err;
1588                                 }
1589                         }
1590                 else
1591 #endif
1592 #ifndef OPENSSL_NO_ECDSA
1593                         if (pkey->type == EVP_PKEY_EC)
1594                         {
1595                         /* let's do ECDSA */
1596                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1597                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1598                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1599                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1600                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1601                                 {
1602                                 /* bad signature */
1603                                 al=SSL_AD_DECRYPT_ERROR;
1604                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1605                                 goto f_err;
1606                                 }
1607                         }
1608                 else
1609 #endif
1610                         {
1611                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1612                         goto err;
1613                         }
1614                 }
1615         else
1616                 {
1617                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1618                         /* aNULL or kPSK do not need public keys */
1619                         {
1620                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1621                         goto err;
1622                         }
1623                 /* still data left over */
1624                 if (n != 0)
1625                         {
1626                         al=SSL_AD_DECODE_ERROR;
1627                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1628                         goto f_err;
1629                         }
1630                 }
1631         EVP_PKEY_free(pkey);
1632         EVP_MD_CTX_cleanup(&md_ctx);
1633         return(1);
1634 f_err:
1635         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1636 err:
1637         EVP_PKEY_free(pkey);
1638 #ifndef OPENSSL_NO_RSA
1639         if (rsa != NULL)
1640                 RSA_free(rsa);
1641 #endif
1642 #ifndef OPENSSL_NO_DH
1643         if (dh != NULL)
1644                 DH_free(dh);
1645 #endif
1646 #ifndef OPENSSL_NO_ECDH
1647         BN_CTX_free(bn_ctx);
1648         EC_POINT_free(srvr_ecpoint);
1649         if (ecdh != NULL)
1650                 EC_KEY_free(ecdh);
1651 #endif
1652         EVP_MD_CTX_cleanup(&md_ctx);
1653         return(-1);
1654         }
1655
1656 int ssl3_get_certificate_request(SSL *s)
1657         {
1658         int ok,ret=0;
1659         unsigned long n,nc,l;
1660         unsigned int llen,ctype_num,i;
1661         X509_NAME *xn=NULL;
1662         const unsigned char *p,*q;
1663         unsigned char *d;
1664         STACK_OF(X509_NAME) *ca_sk=NULL;
1665
1666         n=s->method->ssl_get_message(s,
1667                 SSL3_ST_CR_CERT_REQ_A,
1668                 SSL3_ST_CR_CERT_REQ_B,
1669                 -1,
1670                 s->max_cert_list,
1671                 &ok);
1672
1673         if (!ok) return((int)n);
1674
1675         s->s3->tmp.cert_req=0;
1676
1677         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1678                 {
1679                 s->s3->tmp.reuse_message=1;
1680                 return(1);
1681                 }
1682
1683         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1684                 {
1685                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1686                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1687                 goto err;
1688                 }
1689
1690         /* TLS does not like anon-DH with client cert */
1691         if (s->version > SSL3_VERSION)
1692                 {
1693                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1694                         {
1695                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1696                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1697                         goto err;
1698                         }
1699                 }
1700
1701         p=d=(unsigned char *)s->init_msg;
1702
1703         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1704                 {
1705                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1706                 goto err;
1707                 }
1708
1709         /* get the certificate types */
1710         ctype_num= *(p++);
1711         if (ctype_num > SSL3_CT_NUMBER)
1712                 ctype_num=SSL3_CT_NUMBER;
1713         for (i=0; i<ctype_num; i++)
1714                 s->s3->tmp.ctype[i]= p[i];
1715         p+=ctype_num;
1716
1717         /* get the CA RDNs */
1718         n2s(p,llen);
1719 #if 0
1720 {
1721 FILE *out;
1722 out=fopen("/tmp/vsign.der","w");
1723 fwrite(p,1,llen,out);
1724 fclose(out);
1725 }
1726 #endif
1727
1728         if ((llen+ctype_num+2+1) != n)
1729                 {
1730                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1731                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1732                 goto err;
1733                 }
1734
1735         for (nc=0; nc<llen; )
1736                 {
1737                 n2s(p,l);
1738                 if ((l+nc+2) > llen)
1739                         {
1740                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1741                                 goto cont; /* netscape bugs */
1742                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1743                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1744                         goto err;
1745                         }
1746
1747                 q=p;
1748
1749                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1750                         {
1751                         /* If netscape tolerance is on, ignore errors */
1752                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1753                                 goto cont;
1754                         else
1755                                 {
1756                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1757                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1758                                 goto err;
1759                                 }
1760                         }
1761
1762                 if (q != (p+l))
1763                         {
1764                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1765                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1766                         goto err;
1767                         }
1768                 if (!sk_X509_NAME_push(ca_sk,xn))
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1771                         goto err;
1772                         }
1773
1774                 p+=l;
1775                 nc+=l+2;
1776                 }
1777
1778         if (0)
1779                 {
1780 cont:
1781                 ERR_clear_error();
1782                 }
1783
1784         /* we should setup a certificate to return.... */
1785         s->s3->tmp.cert_req=1;
1786         s->s3->tmp.ctype_num=ctype_num;
1787         if (s->s3->tmp.ca_names != NULL)
1788                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1789         s->s3->tmp.ca_names=ca_sk;
1790         ca_sk=NULL;
1791
1792         ret=1;
1793 err:
1794         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1795         return(ret);
1796         }
1797
1798 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1799         {
1800         return(X509_NAME_cmp(*a,*b));
1801         }
1802 #ifndef OPENSSL_NO_TLSEXT
1803 int ssl3_get_new_session_ticket(SSL *s)
1804         {
1805         int ok,al,ret=0, ticklen;
1806         long n;
1807         const unsigned char *p;
1808         unsigned char *d;
1809
1810         n=s->method->ssl_get_message(s,
1811                 SSL3_ST_CR_SESSION_TICKET_A,
1812                 SSL3_ST_CR_SESSION_TICKET_B,
1813                 -1,
1814                 16384,
1815                 &ok);
1816
1817         if (!ok)
1818                 return((int)n);
1819
1820         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1821                 {
1822                 s->s3->tmp.reuse_message=1;
1823                 return(1);
1824                 }
1825         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1826                 {
1827                 al=SSL_AD_UNEXPECTED_MESSAGE;
1828                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1829                 goto f_err;
1830                 }
1831         if (n < 6)
1832                 {
1833                 /* need at least ticket_lifetime_hint + ticket length */
1834                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1835                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1836                 goto f_err;
1837                 }
1838
1839         p=d=(unsigned char *)s->init_msg;
1840         n2l(p, s->session->tlsext_tick_lifetime_hint);
1841         n2s(p, ticklen);
1842         /* ticket_lifetime_hint + ticket_length + ticket */
1843         if (ticklen + 6 != n)
1844                 {
1845                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1846                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1847                 goto f_err;
1848                 }
1849         if (s->session->tlsext_tick)
1850                 {
1851                 OPENSSL_free(s->session->tlsext_tick);
1852                 s->session->tlsext_ticklen = 0;
1853                 }
1854         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1855         if (!s->session->tlsext_tick)
1856                 {
1857                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1858                 goto err;
1859                 }
1860         memcpy(s->session->tlsext_tick, p, ticklen);
1861         s->session->tlsext_ticklen = ticklen;
1862         /* There are two ways to detect a resumed ticket sesion.
1863          * One is to set an appropriate session ID and then the server
1864          * must return a match in ServerHello. This allows the normal
1865          * client session ID matching to work and we know much
1866          * earlier that the ticket has been accepted.
1867          *
1868          * The other way is to set zero length session ID when the
1869          * ticket is presented and rely on the handshake to determine
1870          * session resumption.
1871          *
1872          * We choose the former approach because this fits in with
1873          * assumptions elsewhere in OpenSSL. The session ID is set
1874          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1875          * ticket.
1876          */
1877         EVP_Digest(p, ticklen,
1878                         s->session->session_id, &s->session->session_id_length,
1879 #ifndef OPENSSL_NO_SHA256
1880                                                         EVP_sha256(), NULL);
1881 #else
1882                                                         EVP_sha1(), NULL);
1883 #endif
1884         ret=1;
1885         return(ret);
1886 f_err:
1887         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1888 err:
1889         return(-1);
1890         }
1891
1892 int ssl3_get_cert_status(SSL *s)
1893         {
1894         int ok, al;
1895         unsigned long resplen,n;
1896         const unsigned char *p;
1897
1898         n=s->method->ssl_get_message(s,
1899                 SSL3_ST_CR_CERT_STATUS_A,
1900                 SSL3_ST_CR_CERT_STATUS_B,
1901                 SSL3_MT_CERTIFICATE_STATUS,
1902                 16384,
1903                 &ok);
1904
1905         if (!ok) return((int)n);
1906         if (n < 4)
1907                 {
1908                 /* need at least status type + length */
1909                 al = SSL_AD_DECODE_ERROR;
1910                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1911                 goto f_err;
1912                 }
1913         p = (unsigned char *)s->init_msg;
1914         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1915                 {
1916                 al = SSL_AD_DECODE_ERROR;
1917                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1918                 goto f_err;
1919                 }
1920         n2l3(p, resplen);
1921         if (resplen + 4 != n)
1922                 {
1923                 al = SSL_AD_DECODE_ERROR;
1924                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1925                 goto f_err;
1926                 }
1927         if (s->tlsext_ocsp_resp)
1928                 OPENSSL_free(s->tlsext_ocsp_resp);
1929         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1930         if (!s->tlsext_ocsp_resp)
1931                 {
1932                 al = SSL_AD_INTERNAL_ERROR;
1933                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1934                 goto f_err;
1935                 }
1936         s->tlsext_ocsp_resplen = resplen;
1937         if (s->ctx->tlsext_status_cb)
1938                 {
1939                 int ret;
1940                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1941                 if (ret == 0)
1942                         {
1943                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1944                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1945                         goto f_err;
1946                         }
1947                 if (ret < 0)
1948                         {
1949                         al = SSL_AD_INTERNAL_ERROR;
1950                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1951                         goto f_err;
1952                         }
1953                 }
1954         return 1;
1955 f_err:
1956         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1957         return(-1);
1958         }
1959 #endif
1960
1961 int ssl3_get_server_done(SSL *s)
1962         {
1963         int ok,ret=0;
1964         long n;
1965
1966         n=s->method->ssl_get_message(s,
1967                 SSL3_ST_CR_SRVR_DONE_A,
1968                 SSL3_ST_CR_SRVR_DONE_B,
1969                 SSL3_MT_SERVER_DONE,
1970                 30, /* should be very small, like 0 :-) */
1971                 &ok);
1972
1973         if (!ok) return((int)n);
1974         if (n > 0)
1975                 {
1976                 /* should contain no data */
1977                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1978                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1979                 return -1;
1980                 }
1981         ret=1;
1982         return(ret);
1983         }
1984
1985
1986 int ssl3_send_client_key_exchange(SSL *s)
1987         {
1988         unsigned char *p,*d;
1989         int n;
1990         unsigned long alg_k;
1991 #ifndef OPENSSL_NO_RSA
1992         unsigned char *q;
1993         EVP_PKEY *pkey=NULL;
1994 #endif
1995 #ifndef OPENSSL_NO_KRB5
1996         KSSL_ERR kssl_err;
1997 #endif /* OPENSSL_NO_KRB5 */
1998 #ifndef OPENSSL_NO_ECDH
1999         EC_KEY *clnt_ecdh = NULL;
2000         const EC_POINT *srvr_ecpoint = NULL;
2001         EVP_PKEY *srvr_pub_pkey = NULL;
2002         unsigned char *encodedPoint = NULL;
2003         int encoded_pt_len = 0;
2004         BN_CTX * bn_ctx = NULL;
2005 #endif
2006
2007         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2008                 {
2009                 d=(unsigned char *)s->init_buf->data;
2010                 p= &(d[4]);
2011
2012                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2013
2014                 /* Fool emacs indentation */
2015                 if (0) {}
2016 #ifndef OPENSSL_NO_RSA
2017                 else if (alg_k & SSL_kRSA)
2018                         {
2019                         RSA *rsa;
2020                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2021
2022                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2023                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2024                         else
2025                                 {
2026                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2027                                 if ((pkey == NULL) ||
2028                                         (pkey->type != EVP_PKEY_RSA) ||
2029                                         (pkey->pkey.rsa == NULL))
2030                                         {
2031                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2032                                         goto err;
2033                                         }
2034                                 rsa=pkey->pkey.rsa;
2035                                 EVP_PKEY_free(pkey);
2036                                 }
2037
2038                         tmp_buf[0]=s->client_version>>8;
2039                         tmp_buf[1]=s->client_version&0xff;
2040                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2041                                         goto err;
2042
2043                         s->session->master_key_length=sizeof tmp_buf;
2044
2045                         q=p;
2046                         /* Fix buf for TLS and beyond */
2047                         if (s->version > SSL3_VERSION)
2048                                 p+=2;
2049                         n=RSA_public_encrypt(sizeof tmp_buf,
2050                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2051 #ifdef PKCS1_CHECK
2052                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2053                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2054 #endif
2055                         if (n <= 0)
2056                                 {
2057                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2058                                 goto err;
2059                                 }
2060
2061                         /* Fix buf for TLS and beyond */
2062                         if (s->version > SSL3_VERSION)
2063                                 {
2064                                 s2n(n,q);
2065                                 n+=2;
2066                                 }
2067
2068                         s->session->master_key_length=
2069                                 s->method->ssl3_enc->generate_master_secret(s,
2070                                         s->session->master_key,
2071                                         tmp_buf,sizeof tmp_buf);
2072                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2073                         }
2074 #endif
2075 #ifndef OPENSSL_NO_KRB5
2076                 else if (alg_k & SSL_kKRB5)
2077                         {
2078                         krb5_error_code krb5rc;
2079                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2080                         /*  krb5_data   krb5_ap_req;  */
2081                         krb5_data       *enc_ticket;
2082                         krb5_data       authenticator, *authp = NULL;
2083                         EVP_CIPHER_CTX  ciph_ctx;
2084                         const EVP_CIPHER *enc = NULL;
2085                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2086                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2087                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2088                                                 + EVP_MAX_IV_LENGTH];
2089                         int             padl, outl = sizeof(epms);
2090
2091                         EVP_CIPHER_CTX_init(&ciph_ctx);
2092
2093 #ifdef KSSL_DEBUG
2094                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2095                                 alg_k, SSL_kKRB5);
2096 #endif  /* KSSL_DEBUG */
2097
2098                         authp = NULL;
2099 #ifdef KRB5SENDAUTH
2100                         if (KRB5SENDAUTH)  authp = &authenticator;
2101 #endif  /* KRB5SENDAUTH */
2102
2103                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2104                                 &kssl_err);
2105                         enc = kssl_map_enc(kssl_ctx->enctype);
2106                         if (enc == NULL)
2107                             goto err;
2108 #ifdef KSSL_DEBUG
2109                         {
2110                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2111                         if (krb5rc && kssl_err.text)
2112                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2113                         }
2114 #endif  /* KSSL_DEBUG */
2115
2116                         if (krb5rc)
2117                                 {
2118                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2119                                                 SSL_AD_HANDSHAKE_FAILURE);
2120                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2121                                                 kssl_err.reason);
2122                                 goto err;
2123                                 }
2124
2125                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2126                         **  in place of RFC 2712 KerberosWrapper, as in:
2127                         **
2128                         **  Send ticket (copy to *p, set n = length)
2129                         **  n = krb5_ap_req.length;
2130                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2131                         **  if (krb5_ap_req.data)
2132                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2133                         **
2134                         **  Now using real RFC 2712 KerberosWrapper
2135                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2136                         **  Note: 2712 "opaque" types are here replaced
2137                         **  with a 2-byte length followed by the value.
2138                         **  Example:
2139                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2140                         **  Where "xx xx" = length bytes.  Shown here with
2141                         **  optional authenticator omitted.
2142                         */
2143
2144                         /*  KerberosWrapper.Ticket              */
2145                         s2n(enc_ticket->length,p);
2146                         memcpy(p, enc_ticket->data, enc_ticket->length);
2147                         p+= enc_ticket->length;
2148                         n = enc_ticket->length + 2;
2149
2150                         /*  KerberosWrapper.Authenticator       */
2151                         if (authp  &&  authp->length)
2152                                 {
2153                                 s2n(authp->length,p);
2154                                 memcpy(p, authp->data, authp->length);
2155                                 p+= authp->length;
2156                                 n+= authp->length + 2;
2157
2158                                 free(authp->data);
2159                                 authp->data = NULL;
2160                                 authp->length = 0;
2161                                 }
2162                         else
2163                                 {
2164                                 s2n(0,p);/*  null authenticator length  */
2165                                 n+=2;
2166                                 }
2167
2168                             tmp_buf[0]=s->client_version>>8;
2169                             tmp_buf[1]=s->client_version&0xff;
2170                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2171                                 goto err;
2172
2173                         /*  20010420 VRS.  Tried it this way; failed.
2174                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2175                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2176                         **                              kssl_ctx->length);
2177                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2178                         */
2179
2180                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2181                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2182                                 kssl_ctx->key,iv);
2183                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2184                                 sizeof tmp_buf);
2185                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2186                         outl += padl;
2187                         if (outl > (int)sizeof epms)
2188                                 {
2189                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2190                                 goto err;
2191                                 }
2192                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2193
2194                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2195                         s2n(outl,p);
2196                         memcpy(p, epms, outl);
2197                         p+=outl;
2198                         n+=outl + 2;
2199
2200                         s->session->master_key_length=
2201                                 s->method->ssl3_enc->generate_master_secret(s,
2202                                         s->session->master_key,
2203                                         tmp_buf, sizeof tmp_buf);
2204
2205                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2206                         OPENSSL_cleanse(epms, outl);
2207                         }
2208 #endif
2209 #ifndef OPENSSL_NO_DH
2210                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2211                         {
2212                         DH *dh_srvr,*dh_clnt;
2213
2214                         if (s->session->sess_cert == NULL)
2215                                 {
2216                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2217                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2218                                 goto err;
2219                                 }
2220
2221                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2222                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2223                         else
2224                                 {
2225                                 /* we get them from the cert */
2226                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2227                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2228                                 goto err;
2229                                 }
2230
2231                         /* generate a new random key */
2232                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2233                                 {
2234                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2235                                 goto err;
2236                                 }
2237                         if (!DH_generate_key(dh_clnt))
2238                                 {
2239                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2240                                 goto err;
2241                                 }
2242
2243                         /* use the 'p' output buffer for the DH key, but
2244                          * make sure to clear it out afterwards */
2245
2246                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2247
2248                         if (n <= 0)
2249                                 {
2250                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2251                                 goto err;
2252                                 }
2253
2254                         /* generate master key from the result */
2255                         s->session->master_key_length=
2256                                 s->method->ssl3_enc->generate_master_secret(s,
2257                                         s->session->master_key,p,n);
2258                         /* clean up */
2259                         memset(p,0,n);
2260
2261                         /* send off the data */
2262                         n=BN_num_bytes(dh_clnt->pub_key);
2263                         s2n(n,p);
2264                         BN_bn2bin(dh_clnt->pub_key,p);
2265                         n+=2;
2266
2267                         DH_free(dh_clnt);
2268
2269                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2270                         }
2271 #endif
2272
2273 #ifndef OPENSSL_NO_ECDH
2274                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2275                         {
2276                         const EC_GROUP *srvr_group = NULL;
2277                         EC_KEY *tkey;
2278                         int ecdh_clnt_cert = 0;
2279                         int field_size = 0;
2280
2281                         /* Did we send out the client's
2282                          * ECDH share for use in premaster
2283                          * computation as part of client certificate?
2284                          * If so, set ecdh_clnt_cert to 1.
2285                          */
2286                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2287                                 {
2288                                 /* XXX: For now, we do not support client
2289                                  * authentication using ECDH certificates.
2290                                  * To add such support, one needs to add
2291                                  * code that checks for appropriate
2292                                  * conditions and sets ecdh_clnt_cert to 1.
2293                                  * For example, the cert have an ECC
2294                                  * key on the same curve as the server's
2295                                  * and the key should be authorized for
2296                                  * key agreement.
2297                                  *
2298                                  * One also needs to add code in ssl3_connect
2299                                  * to skip sending the certificate verify
2300                                  * message.
2301                                  *
2302                                  * if ((s->cert->key->privatekey != NULL) &&
2303                                  *     (s->cert->key->privatekey->type ==
2304                                  *      EVP_PKEY_EC) && ...)
2305                                  * ecdh_clnt_cert = 1;
2306                                  */
2307                                 }
2308
2309                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2310                                 {
2311                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2312                                 }
2313                         else
2314                                 {
2315                                 /* Get the Server Public Key from Cert */
2316                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2317                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2318                                 if ((srvr_pub_pkey == NULL) ||
2319                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2320                                     (srvr_pub_pkey->pkey.ec == NULL))
2321                                         {
2322                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2323                                             ERR_R_INTERNAL_ERROR);
2324                                         goto err;
2325                                         }
2326
2327                                 tkey = srvr_pub_pkey->pkey.ec;
2328                                 }
2329
2330                         srvr_group   = EC_KEY_get0_group(tkey);
2331                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2332
2333                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2334                                 {
2335                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2336                                     ERR_R_INTERNAL_ERROR);
2337                                 goto err;
2338                                 }
2339
2340                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2341                                 {
2342                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2343                                 goto err;
2344                                 }
2345
2346                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2347                                 {
2348                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2349                                 goto err;
2350                                 }
2351                         if (ecdh_clnt_cert)
2352                                 {
2353                                 /* Reuse key info from our certificate
2354                                  * We only need our private key to perform
2355                                  * the ECDH computation.
2356                                  */
2357                                 const BIGNUM *priv_key;
2358                                 tkey = s->cert->key->privatekey->pkey.ec;
2359                                 priv_key = EC_KEY_get0_private_key(tkey);
2360                                 if (priv_key == NULL)
2361                                         {
2362                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2363                                         goto err;
2364                                         }
2365                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2366                                         {
2367                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2368                                         goto err;
2369                                         }
2370                                 }
2371                         else
2372                                 {
2373                                 /* Generate a new ECDH key pair */
2374                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2375                                         {
2376                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2377                                         goto err;
2378                                         }
2379                                 }
2380
2381                         /* use the 'p' output buffer for the ECDH key, but
2382                          * make sure to clear it out afterwards
2383                          */
2384
2385                         field_size = EC_GROUP_get_degree(srvr_group);
2386                         if (field_size <= 0)
2387                                 {
2388                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2389                                        ERR_R_ECDH_LIB);
2390                                 goto err;
2391                                 }
2392                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2393                         if (n <= 0)
2394                                 {
2395                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2396                                        ERR_R_ECDH_LIB);
2397                                 goto err;
2398                                 }
2399
2400                         /* generate master key from the result */
2401                         s->session->master_key_length = s->method->ssl3_enc \
2402                             -> generate_master_secret(s,
2403                                 s->session->master_key,
2404                                 p, n);
2405
2406                         memset(p, 0, n); /* clean up */
2407
2408                         if (ecdh_clnt_cert)
2409                                 {
2410                                 /* Send empty client key exch message */
2411                                 n = 0;
2412                                 }
2413                         else
2414                                 {
2415                                 /* First check the size of encoding and
2416                                  * allocate memory accordingly.
2417                                  */
2418                                 encoded_pt_len =
2419                                     EC_POINT_point2oct(srvr_group,
2420                                         EC_KEY_get0_public_key(clnt_ecdh),
2421                                         POINT_CONVERSION_UNCOMPRESSED,
2422                                         NULL, 0, NULL);
2423
2424                                 encodedPoint = (unsigned char *)
2425                                     OPENSSL_malloc(encoded_pt_len *
2426                                         sizeof(unsigned char));
2427                                 bn_ctx = BN_CTX_new();
2428                                 if ((encodedPoint == NULL) ||
2429                                     (bn_ctx == NULL))
2430                                         {
2431                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2432                                         goto err;
2433                                         }
2434
2435                                 /* Encode the public key */
2436                                 n = EC_POINT_point2oct(srvr_group,
2437                                     EC_KEY_get0_public_key(clnt_ecdh),
2438                                     POINT_CONVERSION_UNCOMPRESSED,
2439                                     encodedPoint, encoded_pt_len, bn_ctx);
2440
2441                                 *p = n; /* length of encoded point */
2442                                 /* Encoded point will be copied here */
2443                                 p += 1;
2444                                 /* copy the point */
2445                                 memcpy((unsigned char *)p, encodedPoint, n);
2446                                 /* increment n to account for length field */
2447                                 n += 1;
2448                                 }
2449
2450                         /* Free allocated memory */
2451                         BN_CTX_free(bn_ctx);
2452                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2453                         if (clnt_ecdh != NULL)
2454                                  EC_KEY_free(clnt_ecdh);
2455                         EVP_PKEY_free(srvr_pub_pkey);
2456                         }
2457 #endif /* !OPENSSL_NO_ECDH */
2458                 else if (alg_k & SSL_kGOST)
2459                         {
2460                         /* GOST key exchange message creation */
2461                         EVP_PKEY_CTX *pkey_ctx;
2462                         X509 *peer_cert;
2463                         size_t msglen;
2464                         unsigned int md_len;
2465                         int keytype;
2466                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2467                         EVP_MD_CTX *ukm_hash;
2468                         EVP_PKEY *pub_key;
2469
2470                         /* Get server sertificate PKEY and create ctx from it */
2471                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2472                         if (!peer_cert)
2473                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2474                         if (!peer_cert)         {
2475                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2476                                         goto err;
2477                                 }
2478
2479                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2480                         /* If we have send a certificate, and certificate key
2481
2482                          * parameters match those of server certificate, use
2483                          * certificate key for key exchange
2484                          */
2485
2486                          /* Otherwise, generate ephemeral key pair */
2487
2488                         EVP_PKEY_encrypt_init(pkey_ctx);
2489                           /* Generate session key */
2490                     RAND_bytes(premaster_secret,32);
2491                         /* If we have client certificate, use its secret as peer key */
2492                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2493                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2494                                         /* If there was an error - just ignore it. Ephemeral key
2495                                         * would be used
2496                                         */
2497                                         ERR_clear_error();
2498                                 }
2499                         }
2500                         /* Compute shared IV and store it in algorithm-specific
2501                          * context data */
2502                         ukm_hash = EVP_MD_CTX_create();
2503                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2504                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2505                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2506                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2507                         EVP_MD_CTX_destroy(ukm_hash);
2508                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2509                                 8,shared_ukm)<0) {
2510                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2511                                                 SSL_R_LIBRARY_BUG);
2512                                         goto err;
2513                                 }
2514                         /* Make GOST keytransport blob message */
2515                         /*Encapsulate it into sequence */
2516                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2517                         msglen=255;
2518                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2519                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2520                                         SSL_R_LIBRARY_BUG);
2521                                 goto err;
2522                         }
2523                         if (msglen >= 0x80)
2524                                 {
2525                                 *(p++)=0x81;
2526                                 *(p++)= msglen & 0xff;
2527                                 n=msglen+3;
2528                                 }
2529                         else
2530                                 {
2531                                 *(p++)= msglen & 0xff;
2532                                 n=msglen+2;
2533                                 }
2534                         memcpy(p, tmp, msglen);
2535                         /* Check if pubkey from client certificate was used */
2536                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2537                                 {
2538                                 /* Set flag "skip certificate verify" */
2539                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2540                                 }
2541                         EVP_PKEY_CTX_free(pkey_ctx);
2542                         s->session->master_key_length=
2543                                 s->method->ssl3_enc->generate_master_secret(s,
2544                                         s->session->master_key,premaster_secret,32);
2545                         EVP_PKEY_free(pub_key);
2546
2547                         }
2548 #ifndef OPENSSL_NO_PSK
2549                 else if (alg_k & SSL_kPSK)
2550                         {
2551                         char identity[PSK_MAX_IDENTITY_LEN];
2552                         unsigned char *t = NULL;
2553                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2554                         unsigned int pre_ms_len = 0, psk_len = 0;
2555                         int psk_err = 1;
2556
2557                         n = 0;
2558                         if (s->psk_client_callback == NULL)
2559                                 {
2560                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2561                                         SSL_R_PSK_NO_CLIENT_CB);
2562                                 goto err;
2563                                 }
2564
2565                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2566                                 identity, PSK_MAX_IDENTITY_LEN,
2567                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2568                         if (psk_len > PSK_MAX_PSK_LEN)
2569                                 {
2570                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2571                                         ERR_R_INTERNAL_ERROR);
2572                                 goto psk_err;
2573                                 }
2574                         else if (psk_len == 0)
2575                                 {
2576                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2577                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2578                                 goto psk_err;
2579                                 }
2580
2581                         /* create PSK pre_master_secret */
2582                         pre_ms_len = 2+psk_len+2+psk_len;
2583                         t = psk_or_pre_ms;
2584                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2585                         s2n(psk_len, t);
2586                         memset(t, 0, psk_len);
2587                         t+=psk_len;
2588                         s2n(psk_len, t);
2589
2590                         if (s->session->psk_identity_hint != NULL)
2591                                 OPENSSL_free(s->session->psk_identity_hint);
2592                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2593                         if (s->ctx->psk_identity_hint != NULL &&
2594                                 s->session->psk_identity_hint == NULL)
2595                                 {
2596                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2597                                         ERR_R_MALLOC_FAILURE);
2598                                 goto psk_err;
2599                                 }
2600
2601                         if (s->session->psk_identity != NULL)
2602                                 OPENSSL_free(s->session->psk_identity);
2603                         s->session->psk_identity = BUF_strdup(identity);
2604                         if (s->session->psk_identity == NULL)
2605                                 {
2606                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2607                                         ERR_R_MALLOC_FAILURE);
2608                                 goto psk_err;
2609                                 }
2610
2611                         s->session->master_key_length =
2612                                 s->method->ssl3_enc->generate_master_secret(s,
2613                                         s->session->master_key,
2614                                         psk_or_pre_ms, pre_ms_len);
2615                         n = strlen(identity);
2616                         s2n(n, p);
2617                         memcpy(p, identity, n);
2618                         n+=2;
2619                         psk_err = 0;
2620                 psk_err:
2621                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2622                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2623                         if (psk_err != 0)
2624                                 {
2625                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2626                                 goto err;
2627                                 }
2628                         }
2629 #endif
2630                 else
2631                         {
2632                         ssl3_send_alert(s, SSL3_AL_FATAL,
2633                             SSL_AD_HANDSHAKE_FAILURE);
2634                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2635                             ERR_R_INTERNAL_ERROR);
2636                         goto err;
2637                         }
2638
2639                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2640                 l2n3(n,d);
2641
2642                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2643                 /* number of bytes to write */
2644                 s->init_num=n+4;
2645                 s->init_off=0;
2646                 }
2647
2648         /* SSL3_ST_CW_KEY_EXCH_B */
2649         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2650 err:
2651 #ifndef OPENSSL_NO_ECDH
2652         BN_CTX_free(bn_ctx);
2653         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2654         if (clnt_ecdh != NULL)
2655                 EC_KEY_free(clnt_ecdh);
2656         EVP_PKEY_free(srvr_pub_pkey);
2657 #endif
2658         return(-1);
2659         }
2660
2661 int ssl3_send_client_verify(SSL *s)
2662         {
2663         unsigned char *p,*d;
2664         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2665         EVP_PKEY *pkey;
2666         EVP_PKEY_CTX *pctx=NULL;
2667 #ifndef OPENSSL_NO_RSA
2668         unsigned u=0;
2669 #endif
2670         unsigned long n;
2671 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2672         int j;
2673 #endif
2674
2675         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2676                 {
2677                 d=(unsigned char *)s->init_buf->data;
2678                 p= &(d[4]);
2679                 pkey=s->cert->key->privatekey;
2680 /* Create context from key and test if sha1 is allowed as digest */
2681                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2682                 EVP_PKEY_sign_init(pctx);
2683                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2684                         {
2685                         s->method->ssl3_enc->cert_verify_mac(s,
2686                                                 NID_sha1,
2687                                                 &(data[MD5_DIGEST_LENGTH]));
2688                         }
2689                 else
2690                         {
2691                         ERR_clear_error();
2692                         }
2693 #ifndef OPENSSL_NO_RSA
2694                 if (pkey->type == EVP_PKEY_RSA)
2695                         {
2696                         s->method->ssl3_enc->cert_verify_mac(s,
2697                                 NID_md5,
2698                                 &(data[0]));
2699                         if (RSA_sign(NID_md5_sha1, data,
2700                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2701                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2702                                 {
2703                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2704                                 goto err;
2705                                 }
2706                         s2n(u,p);
2707                         n=u+2;
2708                         }
2709                 else
2710 #endif
2711 #ifndef OPENSSL_NO_DSA
2712                         if (pkey->type == EVP_PKEY_DSA)
2713                         {
2714                         if (!DSA_sign(pkey->save_type,
2715                                 &(data[MD5_DIGEST_LENGTH]),
2716                                 SHA_DIGEST_LENGTH,&(p[2]),
2717                                 (unsigned int *)&j,pkey->pkey.dsa))
2718                                 {
2719                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2720                                 goto err;
2721                                 }
2722                         s2n(j,p);
2723                         n=j+2;
2724                         }
2725                 else
2726 #endif
2727 #ifndef OPENSSL_NO_ECDSA
2728                         if (pkey->type == EVP_PKEY_EC)
2729                         {
2730                         if (!ECDSA_sign(pkey->save_type,
2731                                 &(data[MD5_DIGEST_LENGTH]),
2732                                 SHA_DIGEST_LENGTH,&(p[2]),
2733                                 (unsigned int *)&j,pkey->pkey.ec))
2734                                 {
2735                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2736                                     ERR_R_ECDSA_LIB);
2737                                 goto err;
2738                                 }
2739                         s2n(j,p);
2740                         n=j+2;
2741                         }
2742                 else
2743 #endif
2744                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2745                 {
2746                 unsigned char signbuf[64];
2747                 int i;
2748                 size_t sigsize=64;
2749                 s->method->ssl3_enc->cert_verify_mac(s,
2750                         NID_id_GostR3411_94,
2751                         data);
2752                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2753                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2754                         ERR_R_INTERNAL_ERROR);
2755                         goto err;
2756                 }
2757                 for (i=63,j=0; i>=0; j++, i--) {
2758                         p[2+j]=signbuf[i];
2759                 }
2760                 s2n(j,p);
2761                 n=j+2;
2762                 }
2763                 else
2764                 {
2765                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2766                         goto err;
2767                 }
2768                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2769                 l2n3(n,d);
2770
2771                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2772                 s->init_num=(int)n+4;
2773                 s->init_off=0;
2774                 }
2775         EVP_PKEY_CTX_free(pctx);
2776         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2777 err:
2778         EVP_PKEY_CTX_free(pctx);
2779         return(-1);
2780         }
2781
2782 int ssl3_send_client_certificate(SSL *s)
2783         {
2784         X509 *x509=NULL;
2785         EVP_PKEY *pkey=NULL;
2786         int i;
2787         unsigned long l;
2788
2789         if (s->state == SSL3_ST_CW_CERT_A)
2790                 {
2791                 if ((s->cert == NULL) ||
2792                         (s->cert->key->x509 == NULL) ||
2793                         (s->cert->key->privatekey == NULL))
2794                         s->state=SSL3_ST_CW_CERT_B;
2795                 else
2796                         s->state=SSL3_ST_CW_CERT_C;
2797                 }
2798
2799         /* We need to get a client cert */
2800         if (s->state == SSL3_ST_CW_CERT_B)
2801                 {
2802                 /* If we get an error, we need to
2803                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2804                  * We then get retied later */
2805                 i=0;
2806                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2807                 if (i < 0)
2808                         {
2809                         s->rwstate=SSL_X509_LOOKUP;
2810                         return(-1);
2811                         }
2812                 s->rwstate=SSL_NOTHING;
2813                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2814                         {
2815                         s->state=SSL3_ST_CW_CERT_B;
2816                         if (    !SSL_use_certificate(s,x509) ||
2817                                 !SSL_use_PrivateKey(s,pkey))
2818                                 i=0;
2819                         }
2820                 else if (i == 1)
2821                         {
2822                         i=0;
2823                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2824                         }
2825
2826                 if (x509 != NULL) X509_free(x509);
2827                 if (pkey != NULL) EVP_PKEY_free(pkey);
2828                 if (i == 0)
2829                         {
2830                         if (s->version == SSL3_VERSION)
2831                                 {
2832                                 s->s3->tmp.cert_req=0;
2833                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2834                                 return(1);
2835                                 }
2836                         else
2837                                 {
2838                                 s->s3->tmp.cert_req=2;
2839                                 }
2840                         }
2841
2842                 /* Ok, we have a cert */
2843                 s->state=SSL3_ST_CW_CERT_C;
2844                 }
2845
2846         if (s->state == SSL3_ST_CW_CERT_C)
2847                 {
2848                 s->state=SSL3_ST_CW_CERT_D;
2849                 l=ssl3_output_cert_chain(s,
2850                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2851                 s->init_num=(int)l;
2852                 s->init_off=0;
2853                 }
2854         /* SSL3_ST_CW_CERT_D */
2855         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2856         }
2857
2858 #define has_bits(i,m)   (((i)&(m)) == (m))
2859
2860 int ssl3_check_cert_and_algorithm(SSL *s)
2861         {
2862         int i,idx;
2863         long alg_k,alg_a;
2864         EVP_PKEY *pkey=NULL;
2865         SESS_CERT *sc;
2866 #ifndef OPENSSL_NO_RSA
2867         RSA *rsa;
2868 #endif
2869 #ifndef OPENSSL_NO_DH
2870         DH *dh;
2871 #endif
2872
2873         sc=s->session->sess_cert;
2874         if (sc == NULL)
2875                 {
2876                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2877                 goto err;
2878                 }
2879
2880         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2881         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2882
2883         /* we don't have a certificate */
2884         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2885                 return(1);
2886
2887 #ifndef OPENSSL_NO_RSA
2888         rsa=s->session->sess_cert->peer_rsa_tmp;
2889 #endif
2890 #ifndef OPENSSL_NO_DH
2891         dh=s->session->sess_cert->peer_dh_tmp;
2892 #endif
2893
2894         /* This is the passed certificate */
2895
2896         idx=sc->peer_cert_type;
2897 #ifndef OPENSSL_NO_ECDH
2898         if (idx == SSL_PKEY_ECC)
2899                 {
2900                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2901                     s->s3->tmp.new_cipher) == 0)
2902                         { /* check failed */
2903                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2904                         goto f_err;
2905                         }
2906                 else
2907                         {
2908                         return 1;
2909                         }
2910                 }
2911 #endif
2912         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2913         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2914         EVP_PKEY_free(pkey);
2915
2916
2917         /* Check that we have a certificate if we require one */
2918         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2919                 {
2920                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2921                 goto f_err;
2922                 }
2923 #ifndef OPENSSL_NO_DSA
2924         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2925                 {
2926                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2927                 goto f_err;
2928                 }
2929 #endif
2930 #ifndef OPENSSL_NO_RSA
2931         if ((alg_k & SSL_kRSA) &&
2932                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2933                 {
2934                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2935                 goto f_err;
2936                 }
2937 #endif
2938 #ifndef OPENSSL_NO_DH
2939         if ((alg_k & SSL_kEDH) &&
2940                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2941                 {
2942                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2943                 goto f_err;
2944                 }
2945         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2946                 {
2947                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2948                 goto f_err;
2949                 }
2950 #ifndef OPENSSL_NO_DSA
2951         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2952                 {
2953                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2954                 goto f_err;
2955                 }
2956 #endif
2957 #endif
2958
2959         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2960                 {
2961 #ifndef OPENSSL_NO_RSA
2962                 if (alg_k & SSL_kRSA)
2963                         {
2964                         if (rsa == NULL
2965                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2966                                 {
2967                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2968                                 goto f_err;
2969                                 }
2970                         }
2971                 else
2972 #endif
2973 #ifndef OPENSSL_NO_DH
2974                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2975                             {
2976                             if (dh == NULL
2977                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2978                                 {
2979                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2980                                 goto f_err;
2981                                 }
2982                         }
2983                 else
2984 #endif
2985                         {
2986                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2987                         goto f_err;
2988                         }
2989                 }
2990         return(1);
2991 f_err:
2992         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2993 err:
2994         return(0);
2995         }
2996
2997 /* Check to see if handshake is full or resumed. Usually this is just a
2998  * case of checking to see if a cache hit has occurred. In the case of
2999  * session tickets we have to check the next message to be sure.
3000  */
3001
3002 #ifndef OPENSSL_NO_TLSEXT
3003 int ssl3_check_finished(SSL *s)
3004         {
3005         int ok;
3006         long n;
3007         /* If we have no ticket it cannot be a resumed session. */
3008         if (!s->session->tlsext_tick)
3009                 return 1;
3010         /* this function is called when we really expect a Certificate
3011          * message, so permit appropriate message length */
3012         n=s->method->ssl_get_message(s,
3013                 SSL3_ST_CR_CERT_A,
3014                 SSL3_ST_CR_CERT_B,
3015                 -1,
3016                 s->max_cert_list,
3017                 &ok);
3018         if (!ok) return((int)n);
3019         s->s3->tmp.reuse_message = 1;
3020         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3021                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3022                 return 2;
3023
3024         return 1;
3025         }
3026 #endif
3027
3028 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3029         {
3030         int i = 0;
3031 #ifndef OPENSSL_NO_ENGINE
3032         if (s->ctx->client_cert_engine)
3033                 {
3034                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3035                                                 SSL_get_client_CA_list(s),
3036                                                 px509, ppkey, NULL, NULL, NULL);
3037                 if (i != 0)
3038                         return i;
3039                 }
3040 #endif
3041         if (s->ctx->client_cert_cb)
3042                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3043         return i;
3044         }