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 #ifndef OPENSSL_NO_TLSEXT
 170 static int ssl3_check_finished(SSL *s);
 171 #endif
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         long num1;
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         s->in_handshake++;
 205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 206
 207         for (;;)
 208                 {
 209                 state=s->state;
 210
 211                 switch(s->state)
 212                         {
 213                 case SSL_ST_RENEGOTIATE:
 214                         s->new_session=1;
 215                         s->state=SSL_ST_CONNECT;
 216                         s->ctx->stats.sess_connect_renegotiate++;
 217                         /* break */
 218                 case SSL_ST_BEFORE:
 219                 case SSL_ST_CONNECT:
 220                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 221                 case SSL_ST_OK|SSL_ST_CONNECT:
 222
 223                         s->server=0;
 224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 225
 226                         if ((s->version & 0xff00 ) != 0x0300)
 227                                 {
 228                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 229                                 ret = -1;
 230                                 goto end;
 231                                 }
 232
 233                         /* s->version=SSL3_VERSION; */
 234                         s->type=SSL_ST_CONNECT;
 235
 236                         if (s->init_buf == NULL)
 237                                 {
 238                                 if ((buf=BUF_MEM_new()) == NULL)
 239                                         {
 240                                         ret= -1;
 241                                         goto end;
 242                                         }
 243                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 244                                         {
 245                                         ret= -1;
 246                                         goto end;
 247                                         }
 248                                 s->init_buf=buf;
 249                                 buf=NULL;
 250                                 }
 251
 252                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 253
 254                         /* setup buffing BIO */
 255                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 256
 257                         /* don't push the buffering BIO quite yet */
 258
 259                         ssl3_init_finished_mac(s);
 260
 261                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 262                         s->ctx->stats.sess_connect++;
 263                         s->init_num=0;
 264                         break;
 265
 266                 case SSL3_ST_CW_CLNT_HELLO_A:
 267                 case SSL3_ST_CW_CLNT_HELLO_B:
 268
 269                         s->shutdown=0;
 270                         ret=ssl3_client_hello(s);
 271                         if (ret <= 0) goto end;
 272                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 273                         s->init_num=0;
 274
 275                         /* turn on buffering for the next lot of output */
 276                         if (s->bbio != s->wbio)
 277                                 s->wbio=BIO_push(s->bbio,s->wbio);
 278
 279                         break;
 280
 281                 case SSL3_ST_CR_SRVR_HELLO_A:
 282                 case SSL3_ST_CR_SRVR_HELLO_B:
 283                         ret=ssl3_get_server_hello(s);
 284                         if (ret <= 0) goto end;
 285
 286                         if (s->hit)
 287                                 s->state=SSL3_ST_CR_FINISHED_A;
 288                         else
 289                                 s->state=SSL3_ST_CR_CERT_A;
 290                         s->init_num=0;
 291                         break;
 292
 293                 case SSL3_ST_CR_CERT_A:
 294                 case SSL3_ST_CR_CERT_B:
 295 #ifndef OPENSSL_NO_TLSEXT
 296                         ret=ssl3_check_finished(s);
 297                         if (ret <= 0) goto end;
 298                         if (ret == 2)
 299                                 {
 300                                 s->hit = 1;
 301                                 if (s->tlsext_ticket_expected)
 302                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 303                                 else
 304                                         s->state=SSL3_ST_CR_FINISHED_A;
 305                                 s->init_num=0;
 306                                 break;
 307                                 }
 308 #endif
 309                         /* Check if it is anon DH/ECDH */
 310                         /* or PSK */
 311                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 312                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 313                                 {
 314                                 ret=ssl3_get_server_certificate(s);
 315                                 if (ret <= 0) goto end;
 316 #ifndef OPENSSL_NO_TLSEXT
 317                                 if (s->tlsext_status_expected)
 318                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 319                                 else
 320                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 321                                 }
 322                         else
 323                                 {
 324                                 skip = 1;
 325                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 326                                 }
 327 #else
 328                                 }
 329                         else
 330                                 skip=1;
 331
 332                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 333 #endif
 334                         s->init_num=0;
 335                         break;
 336
 337                 case SSL3_ST_CR_KEY_EXCH_A:
 338                 case SSL3_ST_CR_KEY_EXCH_B:
 339                         ret=ssl3_get_key_exchange(s);
 340                         if (ret <= 0) goto end;
 341                         s->state=SSL3_ST_CR_CERT_REQ_A;
 342                         s->init_num=0;
 343
 344                         /* at this point we check that we have the
 345                          * required stuff from the server */
 346                         if (!ssl3_check_cert_and_algorithm(s))
 347                                 {
 348                                 ret= -1;
 349                                 goto end;
 350                                 }
 351                         break;
 352
 353                 case SSL3_ST_CR_CERT_REQ_A:
 354                 case SSL3_ST_CR_CERT_REQ_B:
 355                         ret=ssl3_get_certificate_request(s);
 356                         if (ret <= 0) goto end;
 357                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 358                         s->init_num=0;
 359                         break;
 360
 361                 case SSL3_ST_CR_SRVR_DONE_A:
 362                 case SSL3_ST_CR_SRVR_DONE_B:
 363                         ret=ssl3_get_server_done(s);
 364                         if (ret <= 0) goto end;
 365                         if (s->s3->tmp.cert_req)
 366                                 s->state=SSL3_ST_CW_CERT_A;
 367                         else
 368                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 369                         s->init_num=0;
 370
 371                         break;
 372
 373                 case SSL3_ST_CW_CERT_A:
 374                 case SSL3_ST_CW_CERT_B:
 375                 case SSL3_ST_CW_CERT_C:
 376                 case SSL3_ST_CW_CERT_D:
 377                         ret=ssl3_send_client_certificate(s);
 378                         if (ret <= 0) goto end;
 379                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 380                         s->init_num=0;
 381                         break;
 382
 383                 case SSL3_ST_CW_KEY_EXCH_A:
 384                 case SSL3_ST_CW_KEY_EXCH_B:
 385                         ret=ssl3_send_client_key_exchange(s);
 386                         if (ret <= 0) goto end;
 387                         /* EAY EAY EAY need to check for DH fix cert
 388                          * sent back */
 389                         /* For TLS, cert_req is set to 2, so a cert chain
 390                          * of nothing is sent, but no verify packet is sent */
 391                         /* XXX: For now, we do not support client
 392                          * authentication in ECDH cipher suites with
 393                          * ECDH (rather than ECDSA) certificates.
 394                          * We need to skip the certificate verify
 395                          * message when client's ECDH public key is sent
 396                          * inside the client certificate.
 397                          */
 398                         if (s->s3->tmp.cert_req == 1)
 399                                 {
 400                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 401                                 }
 402                         else
 403                                 {
 404                                 s->state=SSL3_ST_CW_CHANGE_A;
 405                                 s->s3->change_cipher_spec=0;
 406                                 }
 407                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 408                                 {
 409                                 s->state=SSL3_ST_CW_CHANGE_A;
 410                                 s->s3->change_cipher_spec=0;
 411                                 }
 412
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_CW_CERT_VRFY_A:
 417                 case SSL3_ST_CW_CERT_VRFY_B:
 418                         ret=ssl3_send_client_verify(s);
 419                         if (ret <= 0) goto end;
 420                         s->state=SSL3_ST_CW_CHANGE_A;
 421                         s->init_num=0;
 422                         s->s3->change_cipher_spec=0;
 423                         break;
 424
 425                 case SSL3_ST_CW_CHANGE_A:
 426                 case SSL3_ST_CW_CHANGE_B:
 427                         ret=ssl3_send_change_cipher_spec(s,
 428                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 429                         if (ret <= 0) goto end;
 430                         s->state=SSL3_ST_CW_FINISHED_A;
 431                         s->init_num=0;
 432
 433                         s->session->cipher=s->s3->tmp.new_cipher;
 434 #ifdef OPENSSL_NO_COMP
 435                         s->session->compress_meth=0;
 436 #else
 437                         if (s->s3->tmp.new_compression == NULL)
 438                                 s->session->compress_meth=0;
 439                         else
 440                                 s->session->compress_meth=
 441                                         s->s3->tmp.new_compression->id;
 442 #endif
 443                         if (!s->method->ssl3_enc->setup_key_block(s))
 444                                 {
 445                                 ret= -1;
 446                                 goto end;
 447                                 }
 448
 449                         if (!s->method->ssl3_enc->change_cipher_state(s,
 450                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 451                                 {
 452                                 ret= -1;
 453                                 goto end;
 454                                 }
 455
 456                         break;
 457
 458                 case SSL3_ST_CW_FINISHED_A:
 459                 case SSL3_ST_CW_FINISHED_B:
 460                         ret=ssl3_send_finished(s,
 461                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 462                                 s->method->ssl3_enc->client_finished_label,
 463                                 s->method->ssl3_enc->client_finished_label_len);
 464                         if (ret <= 0) goto end;
 465                         s->state=SSL3_ST_CW_FLUSH;
 466
 467                         /* clear flags */
 468                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 469                         if (s->hit)
 470                                 {
 471                                 s->s3->tmp.next_state=SSL_ST_OK;
 472                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 473                                         {
 474                                         s->state=SSL_ST_OK;
 475                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 476                                         s->s3->delay_buf_pop_ret=0;
 477                                         }
 478                                 }
 479                         else
 480                                 {
 481 #ifndef OPENSSL_NO_TLSEXT
 482                                 /* Allow NewSessionTicket if ticket expected */
 483                                 if (s->tlsext_ticket_expected)
 484                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 485                                 else
 486 #endif
 487
 488                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 489                                 }
 490                         s->init_num=0;
 491                         break;
 492
 493 #ifndef OPENSSL_NO_TLSEXT
 494                 case SSL3_ST_CR_SESSION_TICKET_A:
 495                 case SSL3_ST_CR_SESSION_TICKET_B:
 496                         ret=ssl3_get_new_session_ticket(s);
 497                         if (ret <= 0) goto end;
 498                         s->state=SSL3_ST_CR_FINISHED_A;
 499                         s->init_num=0;
 500                 break;
 501
 502                 case SSL3_ST_CR_CERT_STATUS_A:
 503                 case SSL3_ST_CR_CERT_STATUS_B:
 504                         ret=ssl3_get_cert_status(s);
 505                         if (ret <= 0) goto end;
 506                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 507                         s->init_num=0;
 508                 break;
 509 #endif
 510
 511                 case SSL3_ST_CR_FINISHED_A:
 512                 case SSL3_ST_CR_FINISHED_B:
 513
 514                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 515                                 SSL3_ST_CR_FINISHED_B);
 516                         if (ret <= 0) goto end;
 517
 518                         if (s->hit)
 519                                 s->state=SSL3_ST_CW_CHANGE_A;
 520                         else
 521                                 s->state=SSL_ST_OK;
 522                         s->init_num=0;
 523                         break;
 524
 525                 case SSL3_ST_CW_FLUSH:
 526                         /* number of bytes to be flushed */
 527                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 528                         if (num1 > 0)
 529                                 {
 530                                 s->rwstate=SSL_WRITING;
 531                                 num1=BIO_flush(s->wbio);
 532                                 if (num1 <= 0) { ret= -1; goto end; }
 533                                 s->rwstate=SSL_NOTHING;
 534                                 }
 535
 536                         s->state=s->s3->tmp.next_state;
 537                         break;
 538
 539                 case SSL_ST_OK:
 540                         /* clean a few things up */
 541                         ssl3_cleanup_key_block(s);
 542
 543                         if (s->init_buf != NULL)
 544                                 {
 545                                 BUF_MEM_free(s->init_buf);
 546                                 s->init_buf=NULL;
 547                                 }
 548
 549                         /* If we are not 'joining' the last two packets,
 550                          * remove the buffering now */
 551                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 552                                 ssl_free_wbio_buffer(s);
 553                         /* else do it later in ssl3_write */
 554
 555                         s->init_num=0;
 556                         s->new_session=0;
 557
 558                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 559                         if (s->hit) s->ctx->stats.sess_hit++;
 560
 561                         ret=1;
 562                         /* s->server=0; */
 563                         s->handshake_func=ssl3_connect;
 564                         s->ctx->stats.sess_connect_good++;
 565
 566                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 567
 568                         goto end;
 569                         /* break; */
 570
 571                 default:
 572                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 573                         ret= -1;
 574                         goto end;
 575                         /* break; */
 576                         }
 577
 578                 /* did we do anything */
 579                 if (!s->s3->tmp.reuse_message && !skip)
 580                         {
 581                         if (s->debug)
 582                                 {
 583                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 584                                         goto end;
 585                                 }
 586
 587                         if ((cb != NULL) && (s->state != state))
 588                                 {
 589                                 new_state=s->state;
 590                                 s->state=state;
 591                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 592                                 s->state=new_state;
 593                                 }
 594                         }
 595                 skip=0;
 596                 }
 597 end:
 598         s->in_handshake--;
 599         if (buf != NULL)
 600                 BUF_MEM_free(buf);
 601         if (cb != NULL)
 602                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 603         return(ret);
 604         }
 605
 606
 607 int ssl3_client_hello(SSL *s)
 608         {
 609         unsigned char *buf;
 610         unsigned char *p,*d;
 611         int i;
 612         unsigned long Time,l;
 613 #ifndef OPENSSL_NO_COMP
 614         int j;
 615         SSL_COMP *comp;
 616 #endif
 617
 618         buf=(unsigned char *)s->init_buf->data;
 619         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 620                 {
 621                 SSL_SESSION *sess = s->session;
 622                 if ((sess == NULL) ||
 623                         (sess->ssl_version != s->version) ||
 624 #ifdef OPENSSL_NO_TLSEXT
 625                         !sess->session_id_length ||
 626 #else
 627                         (!sess->session_id_length && !sess->tlsext_tick) ||
 628 #endif
 629                         (sess->not_resumable))
 630                         {
 631                         if (!ssl_get_new_session(s,0))
 632                                 goto err;
 633                         }
 634                 /* else use the pre-loaded session */
 635
 636                 p=s->s3->client_random;
 637                 Time=(unsigned long)time(NULL);                 /* Time */
 638                 l2n(Time,p);
 639                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 640                         goto err;
 641
 642                 /* Do the message type and length last */
 643                 d=p= &(buf[4]);
 644
 645                 *(p++)=s->version>>8;
 646                 *(p++)=s->version&0xff;
 647                 s->client_version=s->version;
 648
 649                 /* Random stuff */
 650                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 651                 p+=SSL3_RANDOM_SIZE;
 652
 653                 /* Session ID */
 654                 if (s->new_session)
 655                         i=0;
 656                 else
 657                         i=s->session->session_id_length;
 658                 *(p++)=i;
 659                 if (i != 0)
 660                         {
 661                         if (i > (int)sizeof(s->session->session_id))
 662                                 {
 663                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 664                                 goto err;
 665                                 }
 666                         memcpy(p,s->session->session_id,i);
 667                         p+=i;
 668                         }
 669
 670                 /* Ciphers supported */
 671                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 672                 if (i == 0)
 673                         {
 674                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 675                         goto err;
 676                         }
 677                 s2n(i,p);
 678                 p+=i;
 679
 680                 /* COMPRESSION */
 681 #ifdef OPENSSL_NO_COMP
 682                 *(p++)=1;
 683 #else
 684
 685                 if ((s->options & SSL_OP_NO_COMPRESSION)
 686                                         || !s->ctx->comp_methods)
 687                         j=0;
 688                 else
 689                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 690                 *(p++)=1+j;
 691                 for (i=0; i<j; i++)
 692                         {
 693                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 694                         *(p++)=comp->id;
 695                         }
 696 #endif
 697                 *(p++)=0; /* Add the NULL method */
 698
 699 #ifndef OPENSSL_NO_TLSEXT
 700                 /* TLS extensions*/
 701                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 702                         {
 703                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 704                         goto err;
 705                         }
 706                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 707                         {
 708                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 709                         goto err;
 710                         }
 711 #endif
 712
 713                 l=(p-d);
 714                 d=buf;
 715                 *(d++)=SSL3_MT_CLIENT_HELLO;
 716                 l2n3(l,d);
 717
 718                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 719                 /* number of bytes to write */
 720                 s->init_num=p-buf;
 721                 s->init_off=0;
 722                 }
 723
 724         /* SSL3_ST_CW_CLNT_HELLO_B */
 725         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 726 err:
 727         return(-1);
 728         }
 729
 730 int ssl3_get_server_hello(SSL *s)
 731         {
 732         STACK_OF(SSL_CIPHER) *sk;
 733         const SSL_CIPHER *c;
 734         unsigned char *p,*d;
 735         int i,al,ok;
 736         unsigned int j;
 737         long n;
 738 #ifndef OPENSSL_NO_COMP
 739         SSL_COMP *comp;
 740 #endif
 741
 742         n=s->method->ssl_get_message(s,
 743                 SSL3_ST_CR_SRVR_HELLO_A,
 744                 SSL3_ST_CR_SRVR_HELLO_B,
 745                 -1,
 746                 20000, /* ?? */
 747                 &ok);
 748
 749         if (!ok) return((int)n);
 750
 751         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 752                 {
 753                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 754                         {
 755                         if ( s->d1->send_cookie == 0)
 756                                 {
 757                                 s->s3->tmp.reuse_message = 1;
 758                                 return 1;
 759                                 }
 760                         else /* already sent a cookie */
 761                                 {
 762                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 763                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 764                                 goto f_err;
 765                                 }
 766                         }
 767                 }
 768
 769         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 770                 {
 771                 al=SSL_AD_UNEXPECTED_MESSAGE;
 772                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 773                 goto f_err;
 774                 }
 775
 776         d=p=(unsigned char *)s->init_msg;
 777
 778         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 779                 {
 780                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 781                 s->version=(s->version&0xff00)|p[1];
 782                 al=SSL_AD_PROTOCOL_VERSION;
 783                 goto f_err;
 784                 }
 785         p+=2;
 786
 787         /* load the server hello data */
 788         /* load the server random */
 789         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 790         p+=SSL3_RANDOM_SIZE;
 791
 792         /* get the session-id */
 793         j= *(p++);
 794
 795         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 796                 {
 797                 al=SSL_AD_ILLEGAL_PARAMETER;
 798                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 799                 goto f_err;
 800                 }
 801
 802 #ifndef OPENSSL_NO_TLSEXT
 803         /* check if we want to resume the session based on external pre-shared secret */
 804         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 805                 {
 806                 SSL_CIPHER *pref_cipher=NULL;
 807                 s->session->master_key_length=sizeof(s->session->master_key);
 808                 if (s->tls_session_secret_cb(s, s->session->master_key,
 809                                              &s->session->master_key_length,
 810                                              NULL, &pref_cipher,
 811                                              s->tls_session_secret_cb_arg))
 812                         {
 813                         s->session->cipher = pref_cipher ?
 814                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 815                         }
 816                 }
 817 #endif /* OPENSSL_NO_TLSEXT */
 818
 819         if (j != 0 && j == s->session->session_id_length
 820             && memcmp(p,s->session->session_id,j) == 0)
 821             {
 822             if(s->sid_ctx_length != s->session->sid_ctx_length
 823                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 824                 {
 825                 /* actually a client application bug */
 826                 al=SSL_AD_ILLEGAL_PARAMETER;
 827                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 828                 goto f_err;
 829                 }
 830             s->hit=1;
 831             }
 832         else    /* a miss or crap from the other end */
 833                 {
 834                 /* If we were trying for session-id reuse, make a new
 835                  * SSL_SESSION so we don't stuff up other people */
 836                 s->hit=0;
 837                 if (s->session->session_id_length > 0)
 838                         {
 839                         if (!ssl_get_new_session(s,0))
 840                                 {
 841                                 al=SSL_AD_INTERNAL_ERROR;
 842                                 goto f_err;
 843                                 }
 844                         }
 845                 s->session->session_id_length=j;
 846                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 847                 }
 848         p+=j;
 849         c=ssl_get_cipher_by_char(s,p);
 850         if (c == NULL)
 851                 {
 852                 /* unknown cipher */
 853                 al=SSL_AD_ILLEGAL_PARAMETER;
 854                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 855                 goto f_err;
 856                 }
 857         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 858
 859         sk=ssl_get_ciphers_by_id(s);
 860         i=sk_SSL_CIPHER_find(sk,c);
 861         if (i < 0)
 862                 {
 863                 /* we did not say we would use this cipher */
 864                 al=SSL_AD_ILLEGAL_PARAMETER;
 865                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 866                 goto f_err;
 867                 }
 868
 869         /* Depending on the session caching (internal/external), the cipher
 870            and/or cipher_id values may not be set. Make sure that
 871            cipher_id is set and use it for comparison. */
 872         if (s->session->cipher)
 873                 s->session->cipher_id = s->session->cipher->id;
 874         if (s->hit && (s->session->cipher_id != c->id))
 875                 {
 876                 if (!(s->options &
 877                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 878                         {
 879                         al=SSL_AD_ILLEGAL_PARAMETER;
 880                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 881                         goto f_err;
 882                         }
 883                 }
 884         s->s3->tmp.new_cipher=c;
 885         if (!ssl3_digest_cached_records(s))
 886                 goto f_err;
 887
 888         /* lets get the compression algorithm */
 889         /* COMPRESSION */
 890 #ifdef OPENSSL_NO_COMP
 891         if (*(p++) != 0)
 892                 {
 893                 al=SSL_AD_ILLEGAL_PARAMETER;
 894                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 895                 goto f_err;
 896                 }
 897 #else
 898         j= *(p++);
 899         if ((j == 0) || (s->options & SSL_OP_NO_COMPRESSION))
 900                 comp=NULL;
 901         else
 902                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 903
 904         if ((j != 0) && (comp == NULL))
 905                 {
 906                 al=SSL_AD_ILLEGAL_PARAMETER;
 907                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 908                 goto f_err;
 909                 }
 910         else
 911                 {
 912                 s->s3->tmp.new_compression=comp;
 913                 }
 914 #endif
 915
 916 #ifndef OPENSSL_NO_TLSEXT
 917         /* TLS extensions*/
 918         if (s->version > SSL3_VERSION && s->version != DTLS1_VERSION && s->version != DTLS1_BAD_VER)
 919                 {
 920                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 921                         {
 922                         /* 'al' set by ssl_parse_serverhello_tlsext */
 923                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 924                         goto f_err;
 925                         }
 926                 if (ssl_check_serverhello_tlsext(s) <= 0)
 927                         {
 928                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 929                                 goto err;
 930                         }
 931                 }
 932
 933         /* DTLS extensions */
 934         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 935         {
 936                 if (!ssl_parse_serverhello_dtlsext(s,&p,d,n, &al))
 937                 {
 938                         /* 'al' set by ssl_parse_serverhello_dtlsext */
 939                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 940                         goto f_err;
 941                 }
 942         }
 943 #endif
 944
 945         if (p != (d+n))
 946                 {
 947                 /* wrong packet length */
 948                 al=SSL_AD_DECODE_ERROR;
 949                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 950                 goto err;
 951                 }
 952
 953         return(1);
 954 f_err:
 955         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 956 err:
 957         return(-1);
 958         }
 959
 960 int ssl3_get_server_certificate(SSL *s)
 961         {
 962         int al,i,ok,ret= -1;
 963         unsigned long n,nc,llen,l;
 964         X509 *x=NULL;
 965         const unsigned char *q,*p;
 966         unsigned char *d;
 967         STACK_OF(X509) *sk=NULL;
 968         SESS_CERT *sc;
 969         EVP_PKEY *pkey=NULL;
 970         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 971
 972         n=s->method->ssl_get_message(s,
 973                 SSL3_ST_CR_CERT_A,
 974                 SSL3_ST_CR_CERT_B,
 975                 -1,
 976                 s->max_cert_list,
 977                 &ok);
 978
 979         if (!ok) return((int)n);
 980
 981         if (s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE)
 982                 {
 983                 s->s3->tmp.reuse_message=1;
 984                 return(1);
 985                 }
 986
 987         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 988                 {
 989                 al=SSL_AD_UNEXPECTED_MESSAGE;
 990                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 991                 goto f_err;
 992                 }
 993         p=d=(unsigned char *)s->init_msg;
 994
 995         if ((sk=sk_X509_new_null()) == NULL)
 996                 {
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 998                 goto err;
 999                 }
1000
1001         n2l3(p,llen);
1002         if (llen+3 != n)
1003                 {
1004                 al=SSL_AD_DECODE_ERROR;
1005                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1006                 goto f_err;
1007                 }
1008         for (nc=0; nc<llen; )
1009                 {
1010                 n2l3(p,l);
1011                 if ((l+nc+3) > llen)
1012                         {
1013                         al=SSL_AD_DECODE_ERROR;
1014                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1015                         goto f_err;
1016                         }
1017
1018                 q=p;
1019                 x=d2i_X509(NULL,&q,l);
1020                 if (x == NULL)
1021                         {
1022                         al=SSL_AD_BAD_CERTIFICATE;
1023                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1024                         goto f_err;
1025                         }
1026                 if (q != (p+l))
1027                         {
1028                         al=SSL_AD_DECODE_ERROR;
1029                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1030                         goto f_err;
1031                         }
1032                 if (!sk_X509_push(sk,x))
1033                         {
1034                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1035                         goto err;
1036                         }
1037                 x=NULL;
1038                 nc+=l+3;
1039                 p=q;
1040                 }
1041
1042         i=ssl_verify_cert_chain(s,sk);
1043         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1044 #ifndef OPENSSL_NO_KRB5
1045             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1046                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1047 #endif /* OPENSSL_NO_KRB5 */
1048                 )
1049                 {
1050                 al=ssl_verify_alarm_type(s->verify_result);
1051                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1052                 goto f_err;
1053                 }
1054         ERR_clear_error(); /* but we keep s->verify_result */
1055
1056         sc=ssl_sess_cert_new();
1057         if (sc == NULL) goto err;
1058
1059         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1060         s->session->sess_cert=sc;
1061
1062         sc->cert_chain=sk;
1063         /* Inconsistency alert: cert_chain does include the peer's
1064          * certificate, which we don't include in s3_srvr.c */
1065         x=sk_X509_value(sk,0);
1066         sk=NULL;
1067         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1068
1069         pkey=X509_get_pubkey(x);
1070
1071         /* VRS: allow null cert if auth == KRB5 */
1072         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1073                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1074                     ? 0 : 1;
1075
1076 #ifdef KSSL_DEBUG
1077         printf("pkey,x = %p, %p\n", pkey,x);
1078         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1079         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1080                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1081 #endif    /* KSSL_DEBUG */
1082
1083         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1084                 {
1085                 x=NULL;
1086                 al=SSL3_AL_FATAL;
1087                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1088                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1089                 goto f_err;
1090                 }
1091
1092         i=ssl_cert_type(x,pkey);
1093         if (need_cert && i < 0)
1094                 {
1095                 x=NULL;
1096                 al=SSL3_AL_FATAL;
1097                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1098                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1099                 goto f_err;
1100                 }
1101
1102         if (need_cert)
1103                 {
1104                 sc->peer_cert_type=i;
1105                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1106                 /* Why would the following ever happen?
1107                  * We just created sc a couple of lines ago. */
1108                 if (sc->peer_pkeys[i].x509 != NULL)
1109                         X509_free(sc->peer_pkeys[i].x509);
1110                 sc->peer_pkeys[i].x509=x;
1111                 sc->peer_key= &(sc->peer_pkeys[i]);
1112
1113                 if (s->session->peer != NULL)
1114                         X509_free(s->session->peer);
1115                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1116                 s->session->peer=x;
1117                 }
1118         else
1119                 {
1120                 sc->peer_cert_type=i;
1121                 sc->peer_key= NULL;
1122
1123                 if (s->session->peer != NULL)
1124                         X509_free(s->session->peer);
1125                 s->session->peer=NULL;
1126                 }
1127         s->session->verify_result = s->verify_result;
1128
1129         x=NULL;
1130         ret=1;
1131
1132         if (0)
1133                 {
1134 f_err:
1135                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1136                 }
1137 err:
1138         EVP_PKEY_free(pkey);
1139         X509_free(x);
1140         sk_X509_pop_free(sk,X509_free);
1141         return(ret);
1142         }
1143
1144 int ssl3_get_key_exchange(SSL *s)
1145         {
1146 #ifndef OPENSSL_NO_RSA
1147         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1148 #endif
1149         EVP_MD_CTX md_ctx;
1150         unsigned char *param,*p;
1151         int al,i,j,param_len,ok;
1152         long n,alg_k,alg_a;
1153         EVP_PKEY *pkey=NULL;
1154 #ifndef OPENSSL_NO_RSA
1155         RSA *rsa=NULL;
1156 #endif
1157 #ifndef OPENSSL_NO_DH
1158         DH *dh=NULL;
1159 #endif
1160 #ifndef OPENSSL_NO_ECDH
1161         EC_KEY *ecdh = NULL;
1162         BN_CTX *bn_ctx = NULL;
1163         EC_POINT *srvr_ecpoint = NULL;
1164         int curve_nid = 0;
1165         int encoded_pt_len = 0;
1166 #endif
1167
1168         /* use same message size as in ssl3_get_certificate_request()
1169          * as ServerKeyExchange message may be skipped */
1170         n=s->method->ssl_get_message(s,
1171                 SSL3_ST_CR_KEY_EXCH_A,
1172                 SSL3_ST_CR_KEY_EXCH_B,
1173                 -1,
1174                 s->max_cert_list,
1175                 &ok);
1176         if (!ok) return((int)n);
1177
1178         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1179                 {
1180 #ifndef OPENSSL_NO_PSK
1181                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1182                    omitted if no identity hint is sent. Set
1183                    session->sess_cert anyway to avoid problems
1184                    later.*/
1185                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1186                         {
1187                         s->session->sess_cert=ssl_sess_cert_new();
1188                         if (s->ctx->psk_identity_hint)
1189                                 OPENSSL_free(s->ctx->psk_identity_hint);
1190                         s->ctx->psk_identity_hint = NULL;
1191                         }
1192 #endif
1193                 s->s3->tmp.reuse_message=1;
1194                 return(1);
1195                 }
1196
1197         param=p=(unsigned char *)s->init_msg;
1198         if (s->session->sess_cert != NULL)
1199                 {
1200 #ifndef OPENSSL_NO_RSA
1201                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1202                         {
1203                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1204                         s->session->sess_cert->peer_rsa_tmp=NULL;
1205                         }
1206 #endif
1207 #ifndef OPENSSL_NO_DH
1208                 if (s->session->sess_cert->peer_dh_tmp)
1209                         {
1210                         DH_free(s->session->sess_cert->peer_dh_tmp);
1211                         s->session->sess_cert->peer_dh_tmp=NULL;
1212                         }
1213 #endif
1214 #ifndef OPENSSL_NO_ECDH
1215                 if (s->session->sess_cert->peer_ecdh_tmp)
1216                         {
1217                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1218                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1219                         }
1220 #endif
1221                 }
1222         else
1223                 {
1224                 s->session->sess_cert=ssl_sess_cert_new();
1225                 }
1226
1227         param_len=0;
1228         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1229         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1230         EVP_MD_CTX_init(&md_ctx);
1231
1232 #ifndef OPENSSL_NO_PSK
1233         if (alg_k & SSL_kPSK)
1234                 {
1235                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1236
1237                 al=SSL_AD_HANDSHAKE_FAILURE;
1238                 n2s(p,i);
1239                 param_len=i+2;
1240                 /* Store PSK identity hint for later use, hint is used
1241                  * in ssl3_send_client_key_exchange.  Assume that the
1242                  * maximum length of a PSK identity hint can be as
1243                  * long as the maximum length of a PSK identity. */
1244                 if (i > PSK_MAX_IDENTITY_LEN)
1245                         {
1246                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1247                                 SSL_R_DATA_LENGTH_TOO_LONG);
1248                         goto f_err;
1249                         }
1250                 if (param_len > n)
1251                         {
1252                         al=SSL_AD_DECODE_ERROR;
1253                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1254                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1255                         goto f_err;
1256                         }
1257                 /* If received PSK identity hint contains NULL
1258                  * characters, the hint is truncated from the first
1259                  * NULL. p may not be ending with NULL, so create a
1260                  * NULL-terminated string. */
1261                 memcpy(tmp_id_hint, p, i);
1262                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1263                 if (s->ctx->psk_identity_hint != NULL)
1264                         OPENSSL_free(s->ctx->psk_identity_hint);
1265                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1266                 if (s->ctx->psk_identity_hint == NULL)
1267                         {
1268                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1269                         goto f_err;
1270                         }
1271
1272                 p+=i;
1273                 n-=param_len;
1274                 }
1275         else
1276 #endif /* !OPENSSL_NO_PSK */
1277 #ifndef OPENSSL_NO_RSA
1278         if (alg_k & SSL_kRSA)
1279                 {
1280                 if ((rsa=RSA_new()) == NULL)
1281                         {
1282                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1283                         goto err;
1284                         }
1285                 n2s(p,i);
1286                 param_len=i+2;
1287                 if (param_len > n)
1288                         {
1289                         al=SSL_AD_DECODE_ERROR;
1290                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1291                         goto f_err;
1292                         }
1293                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1294                         {
1295                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1296                         goto err;
1297                         }
1298                 p+=i;
1299
1300                 n2s(p,i);
1301                 param_len+=i+2;
1302                 if (param_len > n)
1303                         {
1304                         al=SSL_AD_DECODE_ERROR;
1305                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1306                         goto f_err;
1307                         }
1308                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1309                         {
1310                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1311                         goto err;
1312                         }
1313                 p+=i;
1314                 n-=param_len;
1315
1316                 /* this should be because we are using an export cipher */
1317                 if (alg_a & SSL_aRSA)
1318                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1319                 else
1320                         {
1321                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1322                         goto err;
1323                         }
1324                 s->session->sess_cert->peer_rsa_tmp=rsa;
1325                 rsa=NULL;
1326                 }
1327 #else /* OPENSSL_NO_RSA */
1328         if (0)
1329                 ;
1330 #endif
1331 #ifndef OPENSSL_NO_DH
1332         else if (alg_k & SSL_kEDH)
1333                 {
1334                 if ((dh=DH_new()) == NULL)
1335                         {
1336                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1337                         goto err;
1338                         }
1339                 n2s(p,i);
1340                 param_len=i+2;
1341                 if (param_len > n)
1342                         {
1343                         al=SSL_AD_DECODE_ERROR;
1344                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1345                         goto f_err;
1346                         }
1347                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1348                         {
1349                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1350                         goto err;
1351                         }
1352                 p+=i;
1353
1354                 n2s(p,i);
1355                 param_len+=i+2;
1356                 if (param_len > n)
1357                         {
1358                         al=SSL_AD_DECODE_ERROR;
1359                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1360                         goto f_err;
1361                         }
1362                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1363                         {
1364                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1365                         goto err;
1366                         }
1367                 p+=i;
1368
1369                 n2s(p,i);
1370                 param_len+=i+2;
1371                 if (param_len > n)
1372                         {
1373                         al=SSL_AD_DECODE_ERROR;
1374                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1375                         goto f_err;
1376                         }
1377                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1378                         {
1379                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1380                         goto err;
1381                         }
1382                 p+=i;
1383                 n-=param_len;
1384
1385 #ifndef OPENSSL_NO_RSA
1386                 if (alg_a & SSL_aRSA)
1387                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1388 #else
1389                 if (0)
1390                         ;
1391 #endif
1392 #ifndef OPENSSL_NO_DSA
1393                 else if (alg_a & SSL_aDSS)
1394                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1395 #endif
1396                 /* else anonymous DH, so no certificate or pkey. */
1397
1398                 s->session->sess_cert->peer_dh_tmp=dh;
1399                 dh=NULL;
1400                 }
1401         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1402                 {
1403                 al=SSL_AD_ILLEGAL_PARAMETER;
1404                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1405                 goto f_err;
1406                 }
1407 #endif /* !OPENSSL_NO_DH */
1408
1409 #ifndef OPENSSL_NO_ECDH
1410         else if (alg_k & SSL_kEECDH)
1411                 {
1412                 EC_GROUP *ngroup;
1413                 const EC_GROUP *group;
1414
1415                 if ((ecdh=EC_KEY_new()) == NULL)
1416                         {
1417                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1418                         goto err;
1419                         }
1420
1421                 /* Extract elliptic curve parameters and the
1422                  * server's ephemeral ECDH public key.
1423                  * Keep accumulating lengths of various components in
1424                  * param_len and make sure it never exceeds n.
1425                  */
1426
1427                 /* XXX: For now we only support named (not generic) curves
1428                  * and the ECParameters in this case is just three bytes.
1429                  */
1430                 param_len=3;
1431                 if ((param_len > n) ||
1432                     (*p != NAMED_CURVE_TYPE) ||
1433                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1434                         {
1435                         al=SSL_AD_INTERNAL_ERROR;
1436                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1437                         goto f_err;
1438                         }
1439
1440                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1441                 if (ngroup == NULL)
1442                         {
1443                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1444                         goto err;
1445                         }
1446                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1447                         {
1448                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1449                         goto err;
1450                         }
1451                 EC_GROUP_free(ngroup);
1452
1453                 group = EC_KEY_get0_group(ecdh);
1454
1455                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1456                     (EC_GROUP_get_degree(group) > 163))
1457                         {
1458                         al=SSL_AD_EXPORT_RESTRICTION;
1459                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1460                         goto f_err;
1461                         }
1462
1463                 p+=3;
1464
1465                 /* Next, get the encoded ECPoint */
1466                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1467                     ((bn_ctx = BN_CTX_new()) == NULL))
1468                         {
1469                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1470                         goto err;
1471                         }
1472
1473                 encoded_pt_len = *p;  /* length of encoded point */
1474                 p+=1;
1475                 param_len += (1 + encoded_pt_len);
1476                 if ((param_len > n) ||
1477                     (EC_POINT_oct2point(group, srvr_ecpoint,
1478                         p, encoded_pt_len, bn_ctx) == 0))
1479                         {
1480                         al=SSL_AD_DECODE_ERROR;
1481                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1482                         goto f_err;
1483                         }
1484
1485                 n-=param_len;
1486                 p+=encoded_pt_len;
1487
1488                 /* The ECC/TLS specification does not mention
1489                  * the use of DSA to sign ECParameters in the server
1490                  * key exchange message. We do support RSA and ECDSA.
1491                  */
1492                 if (0) ;
1493 #ifndef OPENSSL_NO_RSA
1494                 else if (alg_a & SSL_aRSA)
1495                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1496 #endif
1497 #ifndef OPENSSL_NO_ECDSA
1498                 else if (alg_a & SSL_aECDSA)
1499                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1500 #endif
1501                 /* else anonymous ECDH, so no certificate or pkey. */
1502                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1503                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1504                 ecdh=NULL;
1505                 BN_CTX_free(bn_ctx);
1506                 EC_POINT_free(srvr_ecpoint);
1507                 srvr_ecpoint = NULL;
1508                 }
1509         else if (alg_k)
1510                 {
1511                 al=SSL_AD_UNEXPECTED_MESSAGE;
1512                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1513                 goto f_err;
1514                 }
1515 #endif /* !OPENSSL_NO_ECDH */
1516
1517
1518         /* p points to the next byte, there are 'n' bytes left */
1519
1520         /* if it was signed, check the signature */
1521         if (pkey != NULL)
1522                 {
1523                 n2s(p,i);
1524                 n-=2;
1525                 j=EVP_PKEY_size(pkey);
1526
1527                 if ((i != n) || (n > j) || (n <= 0))
1528                         {
1529                         /* wrong packet length */
1530                         al=SSL_AD_DECODE_ERROR;
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1532                         goto f_err;
1533                         }
1534
1535 #ifndef OPENSSL_NO_RSA
1536                 if (pkey->type == EVP_PKEY_RSA)
1537                         {
1538                         int num;
1539
1540                         j=0;
1541                         q=md_buf;
1542                         for (num=2; num > 0; num--)
1543                                 {
1544                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1545                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1546                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1547                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1548                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1549                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1550                                 q+=i;
1551                                 j+=i;
1552                                 }
1553                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1554                                                                 pkey->pkey.rsa);
1555                         if (i < 0)
1556                                 {
1557                                 al=SSL_AD_DECRYPT_ERROR;
1558                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1559                                 goto f_err;
1560                                 }
1561                         if (i == 0)
1562                                 {
1563                                 /* bad signature */
1564                                 al=SSL_AD_DECRYPT_ERROR;
1565                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1566                                 goto f_err;
1567                                 }
1568                         }
1569                 else
1570 #endif
1571 #ifndef OPENSSL_NO_DSA
1572                         if (pkey->type == EVP_PKEY_DSA)
1573                         {
1574                         /* lets do DSS */
1575                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1576                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1577                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1578                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1579                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1580                                 {
1581                                 /* bad signature */
1582                                 al=SSL_AD_DECRYPT_ERROR;
1583                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1584                                 goto f_err;
1585                                 }
1586                         }
1587                 else
1588 #endif
1589 #ifndef OPENSSL_NO_ECDSA
1590                         if (pkey->type == EVP_PKEY_EC)
1591                         {
1592                         /* let's do ECDSA */
1593                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1594                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1595                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1596                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1597                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1598                                 {
1599                                 /* bad signature */
1600                                 al=SSL_AD_DECRYPT_ERROR;
1601                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1602                                 goto f_err;
1603                                 }
1604                         }
1605                 else
1606 #endif
1607                         {
1608                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1609                         goto err;
1610                         }
1611                 }
1612         else
1613                 {
1614                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1615                         /* aNULL or kPSK do not need public keys */
1616                         {
1617                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1618                         goto err;
1619                         }
1620                 /* still data left over */
1621                 if (n != 0)
1622                         {
1623                         al=SSL_AD_DECODE_ERROR;
1624                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1625                         goto f_err;
1626                         }
1627                 }
1628         EVP_PKEY_free(pkey);
1629         EVP_MD_CTX_cleanup(&md_ctx);
1630         return(1);
1631 f_err:
1632         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1633 err:
1634         EVP_PKEY_free(pkey);
1635 #ifndef OPENSSL_NO_RSA
1636         if (rsa != NULL)
1637                 RSA_free(rsa);
1638 #endif
1639 #ifndef OPENSSL_NO_DH
1640         if (dh != NULL)
1641                 DH_free(dh);
1642 #endif
1643 #ifndef OPENSSL_NO_ECDH
1644         BN_CTX_free(bn_ctx);
1645         EC_POINT_free(srvr_ecpoint);
1646         if (ecdh != NULL)
1647                 EC_KEY_free(ecdh);
1648 #endif
1649         EVP_MD_CTX_cleanup(&md_ctx);
1650         return(-1);
1651         }
1652
1653 int ssl3_get_certificate_request(SSL *s)
1654         {
1655         int ok,ret=0;
1656         unsigned long n,nc,l;
1657         unsigned int llen,ctype_num,i;
1658         X509_NAME *xn=NULL;
1659         const unsigned char *p,*q;
1660         unsigned char *d;
1661         STACK_OF(X509_NAME) *ca_sk=NULL;
1662
1663         n=s->method->ssl_get_message(s,
1664                 SSL3_ST_CR_CERT_REQ_A,
1665                 SSL3_ST_CR_CERT_REQ_B,
1666                 -1,
1667                 s->max_cert_list,
1668                 &ok);
1669
1670         if (!ok) return((int)n);
1671
1672         s->s3->tmp.cert_req=0;
1673
1674         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1675                 {
1676                 s->s3->tmp.reuse_message=1;
1677                 return(1);
1678                 }
1679
1680         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1681                 {
1682                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1683                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1684                 goto err;
1685                 }
1686
1687         /* TLS does not like anon-DH with client cert */
1688         if (s->version > SSL3_VERSION)
1689                 {
1690                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1691                         {
1692                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1693                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1694                         goto err;
1695                         }
1696                 }
1697
1698         p=d=(unsigned char *)s->init_msg;
1699
1700         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1701                 {
1702                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1703                 goto err;
1704                 }
1705
1706         /* get the certificate types */
1707         ctype_num= *(p++);
1708         if (ctype_num > SSL3_CT_NUMBER)
1709                 ctype_num=SSL3_CT_NUMBER;
1710         for (i=0; i<ctype_num; i++)
1711                 s->s3->tmp.ctype[i]= p[i];
1712         p+=ctype_num;
1713
1714         /* get the CA RDNs */
1715         n2s(p,llen);
1716 #if 0
1717 {
1718 FILE *out;
1719 out=fopen("/tmp/vsign.der","w");
1720 fwrite(p,1,llen,out);
1721 fclose(out);
1722 }
1723 #endif
1724
1725         if ((llen+ctype_num+2+1) != n)
1726                 {
1727                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1728                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1729                 goto err;
1730                 }
1731
1732         for (nc=0; nc<llen; )
1733                 {
1734                 n2s(p,l);
1735                 if ((l+nc+2) > llen)
1736                         {
1737                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1738                                 goto cont; /* netscape bugs */
1739                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1740                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1741                         goto err;
1742                         }
1743
1744                 q=p;
1745
1746                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1747                         {
1748                         /* If netscape tolerance is on, ignore errors */
1749                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1750                                 goto cont;
1751                         else
1752                                 {
1753                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1754                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1755                                 goto err;
1756                                 }
1757                         }
1758
1759                 if (q != (p+l))
1760                         {
1761                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1762                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1763                         goto err;
1764                         }
1765                 if (!sk_X509_NAME_push(ca_sk,xn))
1766                         {
1767                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1768                         goto err;
1769                         }
1770
1771                 p+=l;
1772                 nc+=l+2;
1773                 }
1774
1775         if (0)
1776                 {
1777 cont:
1778                 ERR_clear_error();
1779                 }
1780
1781         /* we should setup a certificate to return.... */
1782         s->s3->tmp.cert_req=1;
1783         s->s3->tmp.ctype_num=ctype_num;
1784         if (s->s3->tmp.ca_names != NULL)
1785                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1786         s->s3->tmp.ca_names=ca_sk;
1787         ca_sk=NULL;
1788
1789         ret=1;
1790 err:
1791         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1792         return(ret);
1793         }
1794
1795 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1796         {
1797         return(X509_NAME_cmp(*a,*b));
1798         }
1799 #ifndef OPENSSL_NO_TLSEXT
1800 int ssl3_get_new_session_ticket(SSL *s)
1801         {
1802         int ok,al,ret=0, ticklen;
1803         long n;
1804         const unsigned char *p;
1805         unsigned char *d;
1806
1807         n=s->method->ssl_get_message(s,
1808                 SSL3_ST_CR_SESSION_TICKET_A,
1809                 SSL3_ST_CR_SESSION_TICKET_B,
1810                 -1,
1811                 16384,
1812                 &ok);
1813
1814         if (!ok)
1815                 return((int)n);
1816
1817         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1818                 {
1819                 s->s3->tmp.reuse_message=1;
1820                 return(1);
1821                 }
1822         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1823                 {
1824                 al=SSL_AD_UNEXPECTED_MESSAGE;
1825                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1826                 goto f_err;
1827                 }
1828         if (n < 6)
1829                 {
1830                 /* need at least ticket_lifetime_hint + ticket length */
1831                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1832                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1833                 goto f_err;
1834                 }
1835         p=d=(unsigned char *)s->init_msg;
1836         n2l(p, s->session->tlsext_tick_lifetime_hint);
1837         n2s(p, ticklen);
1838         /* ticket_lifetime_hint + ticket_length + ticket */
1839         if (ticklen + 6 != n)
1840                 {
1841                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
1842                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1843                 goto f_err;
1844                 }
1845         if (s->session->tlsext_tick)
1846                 {
1847                 OPENSSL_free(s->session->tlsext_tick);
1848                 s->session->tlsext_ticklen = 0;
1849                 }
1850         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1851         if (!s->session->tlsext_tick)
1852                 {
1853                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1854                 goto err;
1855                 }
1856         memcpy(s->session->tlsext_tick, p, ticklen);
1857         s->session->tlsext_ticklen = ticklen;
1858         /* There are two ways to detect a resumed ticket sesion.
1859          * One is to set an appropriate session ID and then the server
1860          * must return a match in ServerHello. This allows the normal
1861          * client session ID matching to work and we know much
1862          * earlier that the ticket has been accepted.
1863          *
1864          * The other way is to set zero length session ID when the
1865          * ticket is presented and rely on the handshake to determine
1866          * session resumption.
1867          *
1868          * We choose the former approach because this fits in with
1869          * assumptions elsewhere in OpenSSL. The session ID is set
1870          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1871          * ticket.
1872          */
1873         EVP_Digest(p, ticklen,
1874                         s->session->session_id, &s->session->session_id_length,
1875 #ifndef OPENSSL_NO_SHA256
1876                                                         EVP_sha256(), NULL);
1877 #else
1878                                                         EVP_sha1(), NULL);
1879 #endif
1880         ret=1;
1881         return(ret);
1882 f_err:
1883         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1884 err:
1885         return(-1);
1886         }
1887
1888 int ssl3_get_cert_status(SSL *s)
1889         {
1890         int ok, al;
1891         unsigned long resplen,n;
1892         const unsigned char *p;
1893
1894         n=s->method->ssl_get_message(s,
1895                 SSL3_ST_CR_CERT_STATUS_A,
1896                 SSL3_ST_CR_CERT_STATUS_B,
1897                 SSL3_MT_CERTIFICATE_STATUS,
1898                 16384,
1899                 &ok);
1900
1901         if (!ok) return((int)n);
1902         if (n < 4)
1903                 {
1904                 /* need at least status type + length */
1905                 al = SSL_AD_DECODE_ERROR;
1906                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1907                 goto f_err;
1908                 }
1909         p = (unsigned char *)s->init_msg;
1910         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1911                 {
1912                 al = SSL_AD_DECODE_ERROR;
1913                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1914                 goto f_err;
1915                 }
1916         n2l3(p, resplen);
1917         if (resplen + 4 != n)
1918                 {
1919                 al = SSL_AD_DECODE_ERROR;
1920                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1921                 goto f_err;
1922                 }
1923         if (s->tlsext_ocsp_resp)
1924                 OPENSSL_free(s->tlsext_ocsp_resp);
1925         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1926         if (!s->tlsext_ocsp_resp)
1927                 {
1928                 al = SSL_AD_INTERNAL_ERROR;
1929                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1930                 goto f_err;
1931                 }
1932         s->tlsext_ocsp_resplen = resplen;
1933         if (s->ctx->tlsext_status_cb)
1934                 {
1935                 int ret;
1936                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1937                 if (ret == 0)
1938                         {
1939                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1940                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1941                         goto f_err;
1942                         }
1943                 if (ret < 0)
1944                         {
1945                         al = SSL_AD_INTERNAL_ERROR;
1946                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1947                         goto f_err;
1948                         }
1949                 }
1950         return 1;
1951 f_err:
1952         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1953         return(-1);
1954         }
1955 #endif
1956
1957 int ssl3_get_server_done(SSL *s)
1958         {
1959         int ok,ret=0;
1960         long n;
1961
1962         n=s->method->ssl_get_message(s,
1963                 SSL3_ST_CR_SRVR_DONE_A,
1964                 SSL3_ST_CR_SRVR_DONE_B,
1965                 SSL3_MT_SERVER_DONE,
1966                 30, /* should be very small, like 0 :-) */
1967                 &ok);
1968
1969         if (!ok) return((int)n);
1970         if (n > 0)
1971                 {
1972                 /* should contain no data */
1973                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1974                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1975                 return -1;
1976                 }
1977         ret=1;
1978         return(ret);
1979         }
1980
1981
1982 int ssl3_send_client_key_exchange(SSL *s)
1983         {
1984         unsigned char *p,*d;
1985         int n;
1986         unsigned long alg_k;
1987 #ifndef OPENSSL_NO_RSA
1988         unsigned char *q;
1989         EVP_PKEY *pkey=NULL;
1990 #endif
1991 #ifndef OPENSSL_NO_KRB5
1992         KSSL_ERR kssl_err;
1993 #endif /* OPENSSL_NO_KRB5 */
1994 #ifndef OPENSSL_NO_ECDH
1995         EC_KEY *clnt_ecdh = NULL;
1996         const EC_POINT *srvr_ecpoint = NULL;
1997         EVP_PKEY *srvr_pub_pkey = NULL;
1998         unsigned char *encodedPoint = NULL;
1999         int encoded_pt_len = 0;
2000         BN_CTX * bn_ctx = NULL;
2001 #endif
2002
2003         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2004                 {
2005                 d=(unsigned char *)s->init_buf->data;
2006                 p= &(d[4]);
2007
2008                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2009
2010                 /* Fool emacs indentation */
2011                 if (0) {}
2012 #ifndef OPENSSL_NO_RSA
2013                 else if (alg_k & SSL_kRSA)
2014                         {
2015                         RSA *rsa;
2016                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2017
2018                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2019                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2020                         else
2021                                 {
2022                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2023                                 if ((pkey == NULL) ||
2024                                         (pkey->type != EVP_PKEY_RSA) ||
2025                                         (pkey->pkey.rsa == NULL))
2026                                         {
2027                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2028                                         goto err;
2029                                         }
2030                                 rsa=pkey->pkey.rsa;
2031                                 EVP_PKEY_free(pkey);
2032                                 }
2033
2034                         tmp_buf[0]=s->client_version>>8;
2035                         tmp_buf[1]=s->client_version&0xff;
2036                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2037                                         goto err;
2038
2039                         s->session->master_key_length=sizeof tmp_buf;
2040
2041                         q=p;
2042                         /* Fix buf for TLS and beyond */
2043                         if (s->version > SSL3_VERSION)
2044                                 p+=2;
2045                         n=RSA_public_encrypt(sizeof tmp_buf,
2046                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2047 #ifdef PKCS1_CHECK
2048                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2049                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2050 #endif
2051                         if (n <= 0)
2052                                 {
2053                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2054                                 goto err;
2055                                 }
2056
2057                         /* Fix buf for TLS and beyond */
2058                         if (s->version > SSL3_VERSION)
2059                                 {
2060                                 s2n(n,q);
2061                                 n+=2;
2062                                 }
2063
2064                         s->session->master_key_length=
2065                                 s->method->ssl3_enc->generate_master_secret(s,
2066                                         s->session->master_key,
2067                                         tmp_buf,sizeof tmp_buf);
2068                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2069                         }
2070 #endif
2071 #ifndef OPENSSL_NO_KRB5
2072                 else if (alg_k & SSL_kKRB5)
2073                         {
2074                         krb5_error_code krb5rc;
2075                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2076                         /*  krb5_data   krb5_ap_req;  */
2077                         krb5_data       *enc_ticket;
2078                         krb5_data       authenticator, *authp = NULL;
2079                         EVP_CIPHER_CTX  ciph_ctx;
2080                         const EVP_CIPHER *enc = NULL;
2081                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2082                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2083                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2084                                                 + EVP_MAX_IV_LENGTH];
2085                         int             padl, outl = sizeof(epms);
2086
2087                         EVP_CIPHER_CTX_init(&ciph_ctx);
2088
2089 #ifdef KSSL_DEBUG
2090                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2091                                 alg_k, SSL_kKRB5);
2092 #endif  /* KSSL_DEBUG */
2093
2094                         authp = NULL;
2095 #ifdef KRB5SENDAUTH
2096                         if (KRB5SENDAUTH)  authp = &authenticator;
2097 #endif  /* KRB5SENDAUTH */
2098
2099                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2100                                 &kssl_err);
2101                         enc = kssl_map_enc(kssl_ctx->enctype);
2102                         if (enc == NULL)
2103                             goto err;
2104 #ifdef KSSL_DEBUG
2105                         {
2106                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2107                         if (krb5rc && kssl_err.text)
2108                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2109                         }
2110 #endif  /* KSSL_DEBUG */
2111
2112                         if (krb5rc)
2113                                 {
2114                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2115                                                 SSL_AD_HANDSHAKE_FAILURE);
2116                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2117                                                 kssl_err.reason);
2118                                 goto err;
2119                                 }
2120
2121                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2122                         **  in place of RFC 2712 KerberosWrapper, as in:
2123                         **
2124                         **  Send ticket (copy to *p, set n = length)
2125                         **  n = krb5_ap_req.length;
2126                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2127                         **  if (krb5_ap_req.data)
2128                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2129                         **
2130                         **  Now using real RFC 2712 KerberosWrapper
2131                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2132                         **  Note: 2712 "opaque" types are here replaced
2133                         **  with a 2-byte length followed by the value.
2134                         **  Example:
2135                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2136                         **  Where "xx xx" = length bytes.  Shown here with
2137                         **  optional authenticator omitted.
2138                         */
2139
2140                         /*  KerberosWrapper.Ticket              */
2141                         s2n(enc_ticket->length,p);
2142                         memcpy(p, enc_ticket->data, enc_ticket->length);
2143                         p+= enc_ticket->length;
2144                         n = enc_ticket->length + 2;
2145
2146                         /*  KerberosWrapper.Authenticator       */
2147                         if (authp  &&  authp->length)
2148                                 {
2149                                 s2n(authp->length,p);
2150                                 memcpy(p, authp->data, authp->length);
2151                                 p+= authp->length;
2152                                 n+= authp->length + 2;
2153
2154                                 free(authp->data);
2155                                 authp->data = NULL;
2156                                 authp->length = 0;
2157                                 }
2158                         else
2159                                 {
2160                                 s2n(0,p);/*  null authenticator length  */
2161                                 n+=2;
2162                                 }
2163
2164                             tmp_buf[0]=s->client_version>>8;
2165                             tmp_buf[1]=s->client_version&0xff;
2166                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2167                                 goto err;
2168
2169                         /*  20010420 VRS.  Tried it this way; failed.
2170                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2171                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2172                         **                              kssl_ctx->length);
2173                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2174                         */
2175
2176                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2177                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2178                                 kssl_ctx->key,iv);
2179                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2180                                 sizeof tmp_buf);
2181                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2182                         outl += padl;
2183                         if (outl > (int)sizeof epms)
2184                                 {
2185                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2186                                 goto err;
2187                                 }
2188                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2189
2190                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2191                         s2n(outl,p);
2192                         memcpy(p, epms, outl);
2193                         p+=outl;
2194                         n+=outl + 2;
2195
2196                         s->session->master_key_length=
2197                                 s->method->ssl3_enc->generate_master_secret(s,
2198                                         s->session->master_key,
2199                                         tmp_buf, sizeof tmp_buf);
2200
2201                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2202                         OPENSSL_cleanse(epms, outl);
2203                         }
2204 #endif
2205 #ifndef OPENSSL_NO_DH
2206                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2207                         {
2208                         DH *dh_srvr,*dh_clnt;
2209
2210                         if (s->session->sess_cert == NULL)
2211                                 {
2212                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2213                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2214                                 goto err;
2215                                 }
2216
2217                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2218                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2219                         else
2220                                 {
2221                                 /* we get them from the cert */
2222                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2223                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2224                                 goto err;
2225                                 }
2226
2227                         /* generate a new random key */
2228                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2229                                 {
2230                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2231                                 goto err;
2232                                 }
2233                         if (!DH_generate_key(dh_clnt))
2234                                 {
2235                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2236                                 goto err;
2237                                 }
2238
2239                         /* use the 'p' output buffer for the DH key, but
2240                          * make sure to clear it out afterwards */
2241
2242                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2243
2244                         if (n <= 0)
2245                                 {
2246                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2247                                 goto err;
2248                                 }
2249
2250                         /* generate master key from the result */
2251                         s->session->master_key_length=
2252                                 s->method->ssl3_enc->generate_master_secret(s,
2253                                         s->session->master_key,p,n);
2254                         /* clean up */
2255                         memset(p,0,n);
2256
2257                         /* send off the data */
2258                         n=BN_num_bytes(dh_clnt->pub_key);
2259                         s2n(n,p);
2260                         BN_bn2bin(dh_clnt->pub_key,p);
2261                         n+=2;
2262
2263                         DH_free(dh_clnt);
2264
2265                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2266                         }
2267 #endif
2268
2269 #ifndef OPENSSL_NO_ECDH
2270                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2271                         {
2272                         const EC_GROUP *srvr_group = NULL;
2273                         EC_KEY *tkey;
2274                         int ecdh_clnt_cert = 0;
2275                         int field_size = 0;
2276
2277                         /* Did we send out the client's
2278                          * ECDH share for use in premaster
2279                          * computation as part of client certificate?
2280                          * If so, set ecdh_clnt_cert to 1.
2281                          */
2282                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2283                                 {
2284                                 /* XXX: For now, we do not support client
2285                                  * authentication using ECDH certificates.
2286                                  * To add such support, one needs to add
2287                                  * code that checks for appropriate
2288                                  * conditions and sets ecdh_clnt_cert to 1.
2289                                  * For example, the cert have an ECC
2290                                  * key on the same curve as the server's
2291                                  * and the key should be authorized for
2292                                  * key agreement.
2293                                  *
2294                                  * One also needs to add code in ssl3_connect
2295                                  * to skip sending the certificate verify
2296                                  * message.
2297                                  *
2298                                  * if ((s->cert->key->privatekey != NULL) &&
2299                                  *     (s->cert->key->privatekey->type ==
2300                                  *      EVP_PKEY_EC) && ...)
2301                                  * ecdh_clnt_cert = 1;
2302                                  */
2303                                 }
2304
2305                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2306                                 {
2307                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2308                                 }
2309                         else
2310                                 {
2311                                 /* Get the Server Public Key from Cert */
2312                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2313                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2314                                 if ((srvr_pub_pkey == NULL) ||
2315                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2316                                     (srvr_pub_pkey->pkey.ec == NULL))
2317                                         {
2318                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2319                                             ERR_R_INTERNAL_ERROR);
2320                                         goto err;
2321                                         }
2322
2323                                 tkey = srvr_pub_pkey->pkey.ec;
2324                                 }
2325
2326                         srvr_group   = EC_KEY_get0_group(tkey);
2327                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2328
2329                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2330                                 {
2331                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2332                                     ERR_R_INTERNAL_ERROR);
2333                                 goto err;
2334                                 }
2335
2336                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2337                                 {
2338                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2339                                 goto err;
2340                                 }
2341
2342                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2343                                 {
2344                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2345                                 goto err;
2346                                 }
2347                         if (ecdh_clnt_cert)
2348                                 {
2349                                 /* Reuse key info from our certificate
2350                                  * We only need our private key to perform
2351                                  * the ECDH computation.
2352                                  */
2353                                 const BIGNUM *priv_key;
2354                                 tkey = s->cert->key->privatekey->pkey.ec;
2355                                 priv_key = EC_KEY_get0_private_key(tkey);
2356                                 if (priv_key == NULL)
2357                                         {
2358                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2359                                         goto err;
2360                                         }
2361                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2362                                         {
2363                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2364                                         goto err;
2365                                         }
2366                                 }
2367                         else
2368                                 {
2369                                 /* Generate a new ECDH key pair */
2370                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2371                                         {
2372                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2373                                         goto err;
2374                                         }
2375                                 }
2376
2377                         /* use the 'p' output buffer for the ECDH key, but
2378                          * make sure to clear it out afterwards
2379                          */
2380
2381                         field_size = EC_GROUP_get_degree(srvr_group);
2382                         if (field_size <= 0)
2383                                 {
2384                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2385                                        ERR_R_ECDH_LIB);
2386                                 goto err;
2387                                 }
2388                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2389                         if (n <= 0)
2390                                 {
2391                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2392                                        ERR_R_ECDH_LIB);
2393                                 goto err;
2394                                 }
2395
2396                         /* generate master key from the result */
2397                         s->session->master_key_length = s->method->ssl3_enc \
2398                             -> generate_master_secret(s,
2399                                 s->session->master_key,
2400                                 p, n);
2401
2402                         memset(p, 0, n); /* clean up */
2403
2404                         if (ecdh_clnt_cert)
2405                                 {
2406                                 /* Send empty client key exch message */
2407                                 n = 0;
2408                                 }
2409                         else
2410                                 {
2411                                 /* First check the size of encoding and
2412                                  * allocate memory accordingly.
2413                                  */
2414                                 encoded_pt_len =
2415                                     EC_POINT_point2oct(srvr_group,
2416                                         EC_KEY_get0_public_key(clnt_ecdh),
2417                                         POINT_CONVERSION_UNCOMPRESSED,
2418                                         NULL, 0, NULL);
2419
2420                                 encodedPoint = (unsigned char *)
2421                                     OPENSSL_malloc(encoded_pt_len *
2422                                         sizeof(unsigned char));
2423                                 bn_ctx = BN_CTX_new();
2424                                 if ((encodedPoint == NULL) ||
2425                                     (bn_ctx == NULL))
2426                                         {
2427                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2428                                         goto err;
2429                                         }
2430
2431                                 /* Encode the public key */
2432                                 n = EC_POINT_point2oct(srvr_group,
2433                                     EC_KEY_get0_public_key(clnt_ecdh),
2434                                     POINT_CONVERSION_UNCOMPRESSED,
2435                                     encodedPoint, encoded_pt_len, bn_ctx);
2436
2437                                 *p = n; /* length of encoded point */
2438                                 /* Encoded point will be copied here */
2439                                 p += 1;
2440                                 /* copy the point */
2441                                 memcpy((unsigned char *)p, encodedPoint, n);
2442                                 /* increment n to account for length field */
2443                                 n += 1;
2444                                 }
2445
2446                         /* Free allocated memory */
2447                         BN_CTX_free(bn_ctx);
2448                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2449                         if (clnt_ecdh != NULL)
2450                                  EC_KEY_free(clnt_ecdh);
2451                         EVP_PKEY_free(srvr_pub_pkey);
2452                         }
2453 #endif /* !OPENSSL_NO_ECDH */
2454                 else if (alg_k & SSL_kGOST)
2455                         {
2456                         /* GOST key exchange message creation */
2457                         EVP_PKEY_CTX *pkey_ctx;
2458                         X509 *peer_cert;
2459                         size_t msglen;
2460                         unsigned int md_len;
2461                         int keytype;
2462                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2463                         EVP_MD_CTX *ukm_hash;
2464                         EVP_PKEY *pub_key;
2465
2466                         /* Get server sertificate PKEY and create ctx from it */
2467                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2468                         if (!peer_cert)
2469                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2470                         if (!peer_cert)         {
2471                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2472                                         goto err;
2473                                 }
2474
2475                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2476                         /* If we have send a certificate, and certificate key
2477
2478                          * parameters match those of server certificate, use
2479                          * certificate key for key exchange
2480                          */
2481
2482                          /* Otherwise, generate ephemeral key pair */
2483
2484                         EVP_PKEY_encrypt_init(pkey_ctx);
2485                           /* Generate session key */
2486                     RAND_bytes(premaster_secret,32);
2487                         /* If we have client certificate, use its secret as peer key */
2488                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2489                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2490                                         /* If there was an error - just ignore it. Ephemeral key
2491                                         * would be used
2492                                         */
2493                                         ERR_clear_error();
2494                                 }
2495                         }
2496                         /* Compute shared IV and store it in algorithm-specific
2497                          * context data */
2498                         ukm_hash = EVP_MD_CTX_create();
2499                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2500                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2501                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2502                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2503                         EVP_MD_CTX_destroy(ukm_hash);
2504                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2505                                 8,shared_ukm)<0) {
2506                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2507                                                 SSL_R_LIBRARY_BUG);
2508                                         goto err;
2509                                 }
2510                         /* Make GOST keytransport blob message */
2511                         /*Encapsulate it into sequence */
2512                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2513                         msglen=255;
2514                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2515                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2516                                         SSL_R_LIBRARY_BUG);
2517                                 goto err;
2518                         }
2519                         if (msglen >= 0x80)
2520                                 {
2521                                 *(p++)=0x81;
2522                                 *(p++)= msglen & 0xff;
2523                                 n=msglen+3;
2524                                 }
2525                         else
2526                                 {
2527                                 *(p++)= msglen & 0xff;
2528                                 n=msglen+2;
2529                                 }
2530                         memcpy(p, tmp, msglen);
2531                         /* Check if pubkey from client certificate was used */
2532                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2533                                 {
2534                                 /* Set flag "skip certificate verify" */
2535                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2536                                 }
2537                         EVP_PKEY_CTX_free(pkey_ctx);
2538                         s->session->master_key_length=
2539                                 s->method->ssl3_enc->generate_master_secret(s,
2540                                         s->session->master_key,premaster_secret,32);
2541                         EVP_PKEY_free(pub_key);
2542
2543                         }
2544 #ifndef OPENSSL_NO_PSK
2545                 else if (alg_k & SSL_kPSK)
2546                         {
2547                         char identity[PSK_MAX_IDENTITY_LEN];
2548                         unsigned char *t = NULL;
2549                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2550                         unsigned int pre_ms_len = 0, psk_len = 0;
2551                         int psk_err = 1;
2552
2553                         n = 0;
2554                         if (s->psk_client_callback == NULL)
2555                                 {
2556                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2557                                         SSL_R_PSK_NO_CLIENT_CB);
2558                                 goto err;
2559                                 }
2560
2561                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2562                                 identity, PSK_MAX_IDENTITY_LEN,
2563                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2564                         if (psk_len > PSK_MAX_PSK_LEN)
2565                                 {
2566                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2567                                         ERR_R_INTERNAL_ERROR);
2568                                 goto psk_err;
2569                                 }
2570                         else if (psk_len == 0)
2571                                 {
2572                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2573                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2574                                 goto psk_err;
2575                                 }
2576
2577                         /* create PSK pre_master_secret */
2578                         pre_ms_len = 2+psk_len+2+psk_len;
2579                         t = psk_or_pre_ms;
2580                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2581                         s2n(psk_len, t);
2582                         memset(t, 0, psk_len);
2583                         t+=psk_len;
2584                         s2n(psk_len, t);
2585
2586                         if (s->session->psk_identity_hint != NULL)
2587                                 OPENSSL_free(s->session->psk_identity_hint);
2588                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2589                         if (s->ctx->psk_identity_hint != NULL &&
2590                                 s->session->psk_identity_hint == NULL)
2591                                 {
2592                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2593                                         ERR_R_MALLOC_FAILURE);
2594                                 goto psk_err;
2595                                 }
2596
2597                         if (s->session->psk_identity != NULL)
2598                                 OPENSSL_free(s->session->psk_identity);
2599                         s->session->psk_identity = BUF_strdup(identity);
2600                         if (s->session->psk_identity == NULL)
2601                                 {
2602                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2603                                         ERR_R_MALLOC_FAILURE);
2604                                 goto psk_err;
2605                                 }
2606
2607                         s->session->master_key_length =
2608                                 s->method->ssl3_enc->generate_master_secret(s,
2609                                         s->session->master_key,
2610                                         psk_or_pre_ms, pre_ms_len);
2611                         n = strlen(identity);
2612                         s2n(n, p);
2613                         memcpy(p, identity, n);
2614                         n+=2;
2615                         psk_err = 0;
2616                 psk_err:
2617                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2618                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2619                         if (psk_err != 0)
2620                                 {
2621                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2622                                 goto err;
2623                                 }
2624                         }
2625 #endif
2626                 else
2627                         {
2628                         ssl3_send_alert(s, SSL3_AL_FATAL,
2629                             SSL_AD_HANDSHAKE_FAILURE);
2630                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2631                             ERR_R_INTERNAL_ERROR);
2632                         goto err;
2633                         }
2634
2635                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2636                 l2n3(n,d);
2637
2638                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2639                 /* number of bytes to write */
2640                 s->init_num=n+4;
2641                 s->init_off=0;
2642                 }
2643
2644         /* SSL3_ST_CW_KEY_EXCH_B */
2645         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2646 err:
2647 #ifndef OPENSSL_NO_ECDH
2648         BN_CTX_free(bn_ctx);
2649         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2650         if (clnt_ecdh != NULL)
2651                 EC_KEY_free(clnt_ecdh);
2652         EVP_PKEY_free(srvr_pub_pkey);
2653 #endif
2654         return(-1);
2655         }
2656
2657 int ssl3_send_client_verify(SSL *s)
2658         {
2659         unsigned char *p,*d;
2660         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2661         EVP_PKEY *pkey;
2662         EVP_PKEY_CTX *pctx=NULL;
2663 #ifndef OPENSSL_NO_RSA
2664         unsigned u=0;
2665 #endif
2666         unsigned long n;
2667 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2668         int j;
2669 #endif
2670
2671         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2672                 {
2673                 d=(unsigned char *)s->init_buf->data;
2674                 p= &(d[4]);
2675                 pkey=s->cert->key->privatekey;
2676 /* Create context from key and test if sha1 is allowed as digest */
2677                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2678                 EVP_PKEY_sign_init(pctx);
2679                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2680                         {
2681                         s->method->ssl3_enc->cert_verify_mac(s,
2682                                                 NID_sha1,
2683                                                 &(data[MD5_DIGEST_LENGTH]));
2684                         }
2685                 else
2686                         {
2687                         ERR_clear_error();
2688                         }
2689 #ifndef OPENSSL_NO_RSA
2690                 if (pkey->type == EVP_PKEY_RSA)
2691                         {
2692                         s->method->ssl3_enc->cert_verify_mac(s,
2693                                 NID_md5,
2694                                 &(data[0]));
2695                         if (RSA_sign(NID_md5_sha1, data,
2696                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2697                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2698                                 {
2699                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2700                                 goto err;
2701                                 }
2702                         s2n(u,p);
2703                         n=u+2;
2704                         }
2705                 else
2706 #endif
2707 #ifndef OPENSSL_NO_DSA
2708                         if (pkey->type == EVP_PKEY_DSA)
2709                         {
2710                         if (!DSA_sign(pkey->save_type,
2711                                 &(data[MD5_DIGEST_LENGTH]),
2712                                 SHA_DIGEST_LENGTH,&(p[2]),
2713                                 (unsigned int *)&j,pkey->pkey.dsa))
2714                                 {
2715                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2716                                 goto err;
2717                                 }
2718                         s2n(j,p);
2719                         n=j+2;
2720                         }
2721                 else
2722 #endif
2723 #ifndef OPENSSL_NO_ECDSA
2724                         if (pkey->type == EVP_PKEY_EC)
2725                         {
2726                         if (!ECDSA_sign(pkey->save_type,
2727                                 &(data[MD5_DIGEST_LENGTH]),
2728                                 SHA_DIGEST_LENGTH,&(p[2]),
2729                                 (unsigned int *)&j,pkey->pkey.ec))
2730                                 {
2731                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2732                                     ERR_R_ECDSA_LIB);
2733                                 goto err;
2734                                 }
2735                         s2n(j,p);
2736                         n=j+2;
2737                         }
2738                 else
2739 #endif
2740                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2741                 {
2742                 unsigned char signbuf[64];
2743                 int i;
2744                 size_t sigsize=64;
2745                 s->method->ssl3_enc->cert_verify_mac(s,
2746                         NID_id_GostR3411_94,
2747                         data);
2748                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2749                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2750                         ERR_R_INTERNAL_ERROR);
2751                         goto err;
2752                 }
2753                 for (i=63,j=0; i>=0; j++, i--) {
2754                         p[2+j]=signbuf[i];
2755                 }
2756                 s2n(j,p);
2757                 n=j+2;
2758                 }
2759                 else
2760                 {
2761                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2762                         goto err;
2763                 }
2764                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2765                 l2n3(n,d);
2766
2767                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2768                 s->init_num=(int)n+4;
2769                 s->init_off=0;
2770                 }
2771         EVP_PKEY_CTX_free(pctx);
2772         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2773 err:
2774         EVP_PKEY_CTX_free(pctx);
2775         return(-1);
2776         }
2777
2778 int ssl3_send_client_certificate(SSL *s)
2779         {
2780         X509 *x509=NULL;
2781         EVP_PKEY *pkey=NULL;
2782         int i;
2783         unsigned long l;
2784
2785         if (s->state == SSL3_ST_CW_CERT_A)
2786                 {
2787                 if ((s->cert == NULL) ||
2788                         (s->cert->key->x509 == NULL) ||
2789                         (s->cert->key->privatekey == NULL))
2790                         s->state=SSL3_ST_CW_CERT_B;
2791                 else
2792                         s->state=SSL3_ST_CW_CERT_C;
2793                 }
2794
2795         /* We need to get a client cert */
2796         if (s->state == SSL3_ST_CW_CERT_B)
2797                 {
2798                 /* If we get an error, we need to
2799                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2800                  * We then get retied later */
2801                 i=0;
2802                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2803                 if (i < 0)
2804                         {
2805                         s->rwstate=SSL_X509_LOOKUP;
2806                         return(-1);
2807                         }
2808                 s->rwstate=SSL_NOTHING;
2809                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2810                         {
2811                         s->state=SSL3_ST_CW_CERT_B;
2812                         if (    !SSL_use_certificate(s,x509) ||
2813                                 !SSL_use_PrivateKey(s,pkey))
2814                                 i=0;
2815                         }
2816                 else if (i == 1)
2817                         {
2818                         i=0;
2819                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2820                         }
2821
2822                 if (x509 != NULL) X509_free(x509);
2823                 if (pkey != NULL) EVP_PKEY_free(pkey);
2824                 if (i == 0)
2825                         {
2826                         if (s->version == SSL3_VERSION)
2827                                 {
2828                                 s->s3->tmp.cert_req=0;
2829                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2830                                 return(1);
2831                                 }
2832                         else
2833                                 {
2834                                 s->s3->tmp.cert_req=2;
2835                                 }
2836                         }
2837
2838                 /* Ok, we have a cert */
2839                 s->state=SSL3_ST_CW_CERT_C;
2840                 }
2841
2842         if (s->state == SSL3_ST_CW_CERT_C)
2843                 {
2844                 s->state=SSL3_ST_CW_CERT_D;
2845                 l=ssl3_output_cert_chain(s,
2846                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2847                 s->init_num=(int)l;
2848                 s->init_off=0;
2849                 }
2850         /* SSL3_ST_CW_CERT_D */
2851         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2852         }
2853
2854 #define has_bits(i,m)   (((i)&(m)) == (m))
2855
2856 int ssl3_check_cert_and_algorithm(SSL *s)
2857         {
2858         int i,idx;
2859         long alg_k,alg_a;
2860         EVP_PKEY *pkey=NULL;
2861         SESS_CERT *sc;
2862 #ifndef OPENSSL_NO_RSA
2863         RSA *rsa;
2864 #endif
2865 #ifndef OPENSSL_NO_DH
2866         DH *dh;
2867 #endif
2868
2869         sc=s->session->sess_cert;
2870         if (sc == NULL)
2871                 {
2872                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2873                 goto err;
2874                 }
2875
2876         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2877         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
2878
2879         /* we don't have a certificate */
2880         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
2881                 return(1);
2882
2883 #ifndef OPENSSL_NO_RSA
2884         rsa=s->session->sess_cert->peer_rsa_tmp;
2885 #endif
2886 #ifndef OPENSSL_NO_DH
2887         dh=s->session->sess_cert->peer_dh_tmp;
2888 #endif
2889
2890         /* This is the passed certificate */
2891
2892         idx=sc->peer_cert_type;
2893 #ifndef OPENSSL_NO_ECDH
2894         if (idx == SSL_PKEY_ECC)
2895                 {
2896                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2897                     s->s3->tmp.new_cipher) == 0)
2898                         { /* check failed */
2899                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2900                         goto f_err;
2901                         }
2902                 else
2903                         {
2904                         return 1;
2905                         }
2906                 }
2907 #endif
2908         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2909         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2910         EVP_PKEY_free(pkey);
2911
2912
2913         /* Check that we have a certificate if we require one */
2914         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2915                 {
2916                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2917                 goto f_err;
2918                 }
2919 #ifndef OPENSSL_NO_DSA
2920         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2921                 {
2922                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2923                 goto f_err;
2924                 }
2925 #endif
2926 #ifndef OPENSSL_NO_RSA
2927         if ((alg_k & SSL_kRSA) &&
2928                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2929                 {
2930                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2931                 goto f_err;
2932                 }
2933 #endif
2934 #ifndef OPENSSL_NO_DH
2935         if ((alg_k & SSL_kEDH) &&
2936                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2937                 {
2938                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2939                 goto f_err;
2940                 }
2941         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2942                 {
2943                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2944                 goto f_err;
2945                 }
2946 #ifndef OPENSSL_NO_DSA
2947         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2948                 {
2949                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2950                 goto f_err;
2951                 }
2952 #endif
2953 #endif
2954
2955         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2956                 {
2957 #ifndef OPENSSL_NO_RSA
2958                 if (alg_k & SSL_kRSA)
2959                         {
2960                         if (rsa == NULL
2961                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2962                                 {
2963                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2964                                 goto f_err;
2965                                 }
2966                         }
2967                 else
2968 #endif
2969 #ifndef OPENSSL_NO_DH
2970                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2971                             {
2972                             if (dh == NULL
2973                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2974                                 {
2975                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2976                                 goto f_err;
2977                                 }
2978                         }
2979                 else
2980 #endif
2981                         {
2982                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2983                         goto f_err;
2984                         }
2985                 }
2986         return(1);
2987 f_err:
2988         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2989 err:
2990         return(0);
2991         }
2992
2993 /* Check to see if handshake is full or resumed. Usually this is just a
2994  * case of checking to see if a cache hit has occurred. In the case of
2995  * session tickets we have to check the next message to be sure.
2996  */
2997
2998 #ifndef OPENSSL_NO_TLSEXT
2999 static int ssl3_check_finished(SSL *s)
3000         {
3001         int ok;
3002         long n;
3003         /* If we have no ticket it cannot be a resumed session. */
3004         if (!s->session->tlsext_tick)
3005                 return 1;
3006         /* this function is called when we really expect a Certificate
3007          * message, so permit appropriate message length */
3008         n=s->method->ssl_get_message(s,
3009                 SSL3_ST_CR_CERT_A,
3010                 SSL3_ST_CR_CERT_B,
3011                 -1,
3012                 s->max_cert_list,
3013                 &ok);
3014         if (!ok) return((int)n);
3015         s->s3->tmp.reuse_message = 1;
3016         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3017                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3018                 return 2;
3019
3020         return 1;
3021         }
3022 #endif
3023
3024 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3025         {
3026         int i = 0;
3027 #ifndef OPENSSL_NO_ENGINE
3028         if (s->ctx->client_cert_engine)
3029                 {
3030                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3031                                                 SSL_get_client_CA_list(s),
3032                                                 px509, ppkey, NULL, NULL, NULL);
3033                 if (i != 0)
3034                         return i;
3035                 }
3036 #endif
3037         if (s->ctx->client_cert_cb)
3038                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3039         return i;
3040         }