ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 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         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
 245                                                         s->version, NULL))
 246                                 {
 247                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
 248                                 return -1;
 249                                 }
 250
 251                         /* s->version=SSL3_VERSION; */
 252                         s->type=SSL_ST_CONNECT;
 253
 254                         if (s->init_buf == NULL)
 255                                 {
 256                                 if ((buf=BUF_MEM_new()) == NULL)
 257                                         {
 258                                         ret= -1;
 259                                         goto end;
 260                                         }
 261                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 262                                         {
 263                                         ret= -1;
 264                                         goto end;
 265                                         }
 266                                 s->init_buf=buf;
 267                                 buf=NULL;
 268                                 }
 269
 270                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 271
 272                         /* setup buffing BIO */
 273                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 274
 275                         /* don't push the buffering BIO quite yet */
 276
 277                         ssl3_init_finished_mac(s);
 278
 279                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 280                         s->ctx->stats.sess_connect++;
 281                         s->init_num=0;
 282                         break;
 283
 284                 case SSL3_ST_CW_CLNT_HELLO_A:
 285                 case SSL3_ST_CW_CLNT_HELLO_B:
 286
 287                         s->shutdown=0;
 288                         ret=ssl3_client_hello(s);
 289                         if (ret <= 0) goto end;
 290                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 291                         s->init_num=0;
 292
 293                         /* turn on buffering for the next lot of output */
 294                         if (s->bbio != s->wbio)
 295                                 s->wbio=BIO_push(s->bbio,s->wbio);
 296
 297                         break;
 298
 299                 case SSL3_ST_CR_SRVR_HELLO_A:
 300                 case SSL3_ST_CR_SRVR_HELLO_B:
 301                         ret=ssl3_get_server_hello(s);
 302                         if (ret <= 0) goto end;
 303
 304                         if (s->hit)
 305                                 {
 306                                 s->state=SSL3_ST_CR_FINISHED_A;
 307 #ifndef OPENSSL_NO_TLSEXT
 308                                 if (s->tlsext_ticket_expected)
 309                                         {
 310                                         /* receive renewed session ticket */
 311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 312                                         }
 313 #endif
 314                                 }
 315                         else
 316                                 {
 317                                         s->state=SSL3_ST_CR_CERT_A;
 318                                 }
 319                         s->init_num=0;
 320                         break;
 321 #ifndef OPENSSL_NO_TLSEXT
 322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
 323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
 324                         ret = tls1_get_server_supplemental_data(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_A;
 327                         s->init_num = 0;
 328                         break;
 329 #endif
 330                 case SSL3_ST_CR_CERT_A:
 331                 case SSL3_ST_CR_CERT_B:
 332 #ifndef OPENSSL_NO_TLSEXT
 333                         ret=ssl3_check_finished(s);
 334                         if (ret <= 0) goto end;
 335                         if (ret == 3)
 336                                 {
 337                                 s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 338                                 s->init_num=0;
 339                                 break;
 340                                 }
 341                         if (ret == 2)
 342                                 {
 343                                 s->hit = 1;
 344                                 if (s->tlsext_ticket_expected)
 345                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 346                                 else
 347                                         s->state=SSL3_ST_CR_FINISHED_A;
 348                                 s->init_num=0;
 349                                 break;
 350                                 }
 351 #endif
 352                         /* Check if it is anon DH/ECDH */
 353                         /* or PSK */
 354                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 355                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 356                                 {
 357                                 ret=ssl3_get_server_certificate(s);
 358                                 if (ret <= 0) goto end;
 359 #ifndef OPENSSL_NO_TLSEXT
 360                                 if (s->tlsext_status_expected)
 361                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 362                                 else
 363                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 364                                 }
 365                         else
 366                                 {
 367                                 skip = 1;
 368                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 369                                 }
 370 #else
 371                                 }
 372                         else
 373                                 skip=1;
 374
 375                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 376 #endif
 377                         s->init_num=0;
 378                         break;
 379
 380                 case SSL3_ST_CR_KEY_EXCH_A:
 381                 case SSL3_ST_CR_KEY_EXCH_B:
 382                         ret=ssl3_get_key_exchange(s);
 383                         if (ret <= 0) goto end;
 384                         s->state=SSL3_ST_CR_CERT_REQ_A;
 385                         s->init_num=0;
 386
 387                         /* at this point we check that we have the
 388                          * required stuff from the server */
 389                         if (!ssl3_check_cert_and_algorithm(s))
 390                                 {
 391                                 ret= -1;
 392                                 goto end;
 393                                 }
 394                         break;
 395
 396                 case SSL3_ST_CR_CERT_REQ_A:
 397                 case SSL3_ST_CR_CERT_REQ_B:
 398                         ret=ssl3_get_certificate_request(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 401                         s->init_num=0;
 402                         break;
 403
 404                 case SSL3_ST_CR_SRVR_DONE_A:
 405                 case SSL3_ST_CR_SRVR_DONE_B:
 406                         ret=ssl3_get_server_done(s);
 407                         if (ret <= 0) goto end;
 408 #ifndef OPENSSL_NO_SRP
 409                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 410                                 {
 411                                 if ((ret = SRP_Calc_A_param(s))<=0)
 412                                         {
 413                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 414                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 415                                         goto end;
 416                                         }
 417                                 }
 418 #endif
 419 #ifndef OPENSSL_NO_TLSEXT
 420                         s->state=SSL3_ST_CW_SUPPLEMENTAL_DATA_A;
 421 #else
 422                         if (s->s3->tmp.cert_req)
 423                                 s->state=SSL3_ST_CW_CERT_A;
 424                         else
 425                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 426 #endif
 427                         s->init_num=0;
 428
 429                         break;
 430
 431                 case SSL3_ST_CW_CERT_A:
 432                 case SSL3_ST_CW_CERT_B:
 433                 case SSL3_ST_CW_CERT_C:
 434                 case SSL3_ST_CW_CERT_D:
 435                         ret=ssl3_send_client_certificate(s);
 436                         if (ret <= 0) goto end;
 437                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_CW_KEY_EXCH_A:
 442                 case SSL3_ST_CW_KEY_EXCH_B:
 443                         ret=ssl3_send_client_key_exchange(s);
 444                         if (ret <= 0) goto end;
 445                         /* EAY EAY EAY need to check for DH fix cert
 446                          * sent back */
 447                         /* For TLS, cert_req is set to 2, so a cert chain
 448                          * of nothing is sent, but no verify packet is sent */
 449                         /* XXX: For now, we do not support client
 450                          * authentication in ECDH cipher suites with
 451                          * ECDH (rather than ECDSA) certificates.
 452                          * We need to skip the certificate verify
 453                          * message when client's ECDH public key is sent
 454                          * inside the client certificate.
 455                          */
 456                         if (s->s3->tmp.cert_req == 1)
 457                                 {
 458                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 459                                 }
 460                         else
 461                                 {
 462                                 s->state=SSL3_ST_CW_CHANGE_A;
 463                                 s->s3->change_cipher_spec=0;
 464                                 }
 465                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 466                                 {
 467                                 s->state=SSL3_ST_CW_CHANGE_A;
 468                                 s->s3->change_cipher_spec=0;
 469                                 }
 470
 471                         s->init_num=0;
 472                         break;
 473
 474                 case SSL3_ST_CW_CERT_VRFY_A:
 475                 case SSL3_ST_CW_CERT_VRFY_B:
 476                         ret=ssl3_send_client_verify(s);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CW_CHANGE_A;
 479                         s->init_num=0;
 480                         s->s3->change_cipher_spec=0;
 481                         break;
 482
 483                 case SSL3_ST_CW_CHANGE_A:
 484                 case SSL3_ST_CW_CHANGE_B:
 485                         ret=ssl3_send_change_cipher_spec(s,
 486                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 487                         if (ret <= 0) goto end;
 488
 489 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 490                         s->state=SSL3_ST_CW_FINISHED_A;
 491 #else
 492                         if (s->s3->next_proto_neg_seen)
 493                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 494                         else
 495                                 s->state=SSL3_ST_CW_FINISHED_A;
 496 #endif
 497                         s->init_num=0;
 498
 499                         s->session->cipher=s->s3->tmp.new_cipher;
 500 #ifdef OPENSSL_NO_COMP
 501                         s->session->compress_meth=0;
 502 #else
 503                         if (s->s3->tmp.new_compression == NULL)
 504                                 s->session->compress_meth=0;
 505                         else
 506                                 s->session->compress_meth=
 507                                         s->s3->tmp.new_compression->id;
 508 #endif
 509                         if (!s->method->ssl3_enc->setup_key_block(s))
 510                                 {
 511                                 ret= -1;
 512                                 goto end;
 513                                 }
 514
 515                         if (!s->method->ssl3_enc->change_cipher_state(s,
 516                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 517                                 {
 518                                 ret= -1;
 519                                 goto end;
 520                                 }
 521
 522                         break;
 523
 524 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 525                 case SSL3_ST_CW_NEXT_PROTO_A:
 526                 case SSL3_ST_CW_NEXT_PROTO_B:
 527                         ret=ssl3_send_next_proto(s);
 528                         if (ret <= 0) goto end;
 529                         s->state=SSL3_ST_CW_FINISHED_A;
 530                         break;
 531 #endif
 532
 533 #ifndef OPENSSL_NO_TLSEXT
 534                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_A:
 535                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_B:
 536                         ret = tls1_send_client_supplemental_data(s, &skip);
 537                         if (ret <= 0) goto end;
 538                         if (s->s3->tmp.cert_req)
 539                                 s->state=SSL3_ST_CW_CERT_A;
 540                         else
 541                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 542                         s->init_num=0;
 543                         break;
 544 #endif
 545
 546                 case SSL3_ST_CW_FINISHED_A:
 547                 case SSL3_ST_CW_FINISHED_B:
 548                         ret=ssl3_send_finished(s,
 549                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 550                                 s->method->ssl3_enc->client_finished_label,
 551                                 s->method->ssl3_enc->client_finished_label_len);
 552                         if (ret <= 0) goto end;
 553                         s->state=SSL3_ST_CW_FLUSH;
 554
 555                         /* clear flags */
 556                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 557                         if (s->hit)
 558                                 {
 559                                 s->s3->tmp.next_state=SSL_ST_OK;
 560                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 561                                         {
 562                                         s->state=SSL_ST_OK;
 563                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 564                                         s->s3->delay_buf_pop_ret=0;
 565                                         }
 566                                 }
 567                         else
 568                                 {
 569 #ifndef OPENSSL_NO_TLSEXT
 570                                 /* Allow NewSessionTicket if ticket expected */
 571                                 if (s->tlsext_ticket_expected)
 572                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 573                                 else
 574 #endif
 575
 576                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 577                                 }
 578                         s->init_num=0;
 579                         break;
 580
 581 #ifndef OPENSSL_NO_TLSEXT
 582                 case SSL3_ST_CR_SESSION_TICKET_A:
 583                 case SSL3_ST_CR_SESSION_TICKET_B:
 584                         ret=ssl3_get_new_session_ticket(s);
 585                         if (ret <= 0) goto end;
 586                         s->state=SSL3_ST_CR_FINISHED_A;
 587                         s->init_num=0;
 588                 break;
 589
 590                 case SSL3_ST_CR_CERT_STATUS_A:
 591                 case SSL3_ST_CR_CERT_STATUS_B:
 592                         ret=ssl3_get_cert_status(s);
 593                         if (ret <= 0) goto end;
 594                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 595                         s->init_num=0;
 596                 break;
 597 #endif
 598
 599                 case SSL3_ST_CR_FINISHED_A:
 600                 case SSL3_ST_CR_FINISHED_B:
 601
 602                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 603                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 604                                 SSL3_ST_CR_FINISHED_B);
 605                         if (ret <= 0) goto end;
 606
 607                         if (s->hit)
 608                                 s->state=SSL3_ST_CW_CHANGE_A;
 609                         else
 610                                 s->state=SSL_ST_OK;
 611                         s->init_num=0;
 612                         break;
 613
 614                 case SSL3_ST_CW_FLUSH:
 615                         s->rwstate=SSL_WRITING;
 616                         if (BIO_flush(s->wbio) <= 0)
 617                                 {
 618                                 ret= -1;
 619                                 goto end;
 620                                 }
 621                         s->rwstate=SSL_NOTHING;
 622                         s->state=s->s3->tmp.next_state;
 623                         break;
 624
 625                 case SSL_ST_OK:
 626                         /* clean a few things up */
 627                         ssl3_cleanup_key_block(s);
 628
 629                         if (s->init_buf != NULL)
 630                                 {
 631                                 BUF_MEM_free(s->init_buf);
 632                                 s->init_buf=NULL;
 633                                 }
 634
 635                         /* If we are not 'joining' the last two packets,
 636                          * remove the buffering now */
 637                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 638                                 ssl_free_wbio_buffer(s);
 639                         /* else do it later in ssl3_write */
 640
 641                         s->init_num=0;
 642                         s->renegotiate=0;
 643                         s->new_session=0;
 644
 645                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 646                         if (s->hit) s->ctx->stats.sess_hit++;
 647
 648                         ret=1;
 649                         /* s->server=0; */
 650                         s->handshake_func=ssl3_connect;
 651                         s->ctx->stats.sess_connect_good++;
 652
 653                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 654
 655                         goto end;
 656                         /* break; */
 657
 658                 default:
 659                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 660                         ret= -1;
 661                         goto end;
 662                         /* break; */
 663                         }
 664
 665                 /* did we do anything */
 666                 if (!s->s3->tmp.reuse_message && !skip)
 667                         {
 668                         if (s->debug)
 669                                 {
 670                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 671                                         goto end;
 672                                 }
 673
 674                         if ((cb != NULL) && (s->state != state))
 675                                 {
 676                                 new_state=s->state;
 677                                 s->state=state;
 678                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 679                                 s->state=new_state;
 680                                 }
 681                         }
 682                 skip=0;
 683                 }
 684 end:
 685         s->in_handshake--;
 686         if (buf != NULL)
 687                 BUF_MEM_free(buf);
 688         if (cb != NULL)
 689                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 690         return(ret);
 691         }
 692
 693
 694 int ssl3_client_hello(SSL *s)
 695         {
 696         unsigned char *buf;
 697         unsigned char *p,*d;
 698         int i;
 699         unsigned long l;
 700         int al = 0;
 701 #ifndef OPENSSL_NO_COMP
 702         int j;
 703         SSL_COMP *comp;
 704 #endif
 705
 706         buf=(unsigned char *)s->init_buf->data;
 707         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 708                 {
 709                 SSL_SESSION *sess = s->session;
 710                 if ((sess == NULL) ||
 711                         (sess->ssl_version != s->version) ||
 712 #ifdef OPENSSL_NO_TLSEXT
 713                         !sess->session_id_length ||
 714 #else
 715                         (!sess->session_id_length && !sess->tlsext_tick) ||
 716 #endif
 717                         (sess->not_resumable))
 718                         {
 719                         if (!ssl_get_new_session(s,0))
 720                                 goto err;
 721                         }
 722                 if (s->method->version == DTLS_ANY_VERSION)
 723                         {
 724                         /* Determine which DTLS version to use */
 725                         int options = s->options;
 726                         /* If DTLS 1.2 disabled correct the version number */
 727                         if (options & SSL_OP_NO_DTLSv1_2)
 728                                 {
 729                                 if (tls1_suiteb(s))
 730                                         {
 731                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 732                                         goto err;
 733                                         }
 734                                 /* Disabling all versions is silly: return an
 735                                  * error.
 736                                  */
 737                                 if (options & SSL_OP_NO_DTLSv1)
 738                                         {
 739                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 740                                         goto err;
 741                                         }
 742                                 /* Update method so we don't use any DTLS 1.2
 743                                  * features.
 744                                  */
 745                                 s->method = DTLSv1_client_method();
 746                                 s->version = DTLS1_VERSION;
 747                                 }
 748                         else
 749                                 {
 750                                 /* We only support one version: update method */
 751                                 if (options & SSL_OP_NO_DTLSv1)
 752                                         s->method = DTLSv1_2_client_method();
 753                                 s->version = DTLS1_2_VERSION;
 754                                 }
 755                         s->client_version = s->version;
 756                         }
 757                 /* else use the pre-loaded session */
 758
 759                 p=s->s3->client_random;
 760
 761                 /* for DTLS if client_random is initialized, reuse it, we are
 762                  * required to use same upon reply to HelloVerify */
 763                 if (SSL_IS_DTLS(s))
 764                         {
 765                         size_t idx;
 766                         i = 1;
 767                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 768                                 {
 769                                 if (p[idx])
 770                                         {
 771                                         i = 0;
 772                                         break;
 773                                         }
 774                                 }
 775                         }
 776                 else
 777                         i = 1;
 778
 779                 if (i)
 780                         ssl_fill_hello_random(s, 0, p,
 781                                               sizeof(s->s3->client_random));
 782
 783                 /* Do the message type and length last */
 784                 d=p= ssl_handshake_start(s);
 785
 786                 /* version indicates the negotiated version: for example from
 787                  * an SSLv2/v3 compatible client hello). The client_version
 788                  * field is the maximum version we permit and it is also
 789                  * used in RSA encrypted premaster secrets. Some servers can
 790                  * choke if we initially report a higher version then
 791                  * renegotiate to a lower one in the premaster secret. This
 792                  * didn't happen with TLS 1.0 as most servers supported it
 793                  * but it can with TLS 1.1 or later if the server only supports
 794                  * 1.0.
 795                  *
 796                  * Possible scenario with previous logic:
 797                  *      1. Client hello indicates TLS 1.2
 798                  *      2. Server hello says TLS 1.0
 799                  *      3. RSA encrypted premaster secret uses 1.2.
 800                  *      4. Handhaked proceeds using TLS 1.0.
 801                  *      5. Server sends hello request to renegotiate.
 802                  *      6. Client hello indicates TLS v1.0 as we now
 803                  *         know that is maximum server supports.
 804                  *      7. Server chokes on RSA encrypted premaster secret
 805                  *         containing version 1.0.
 806                  *
 807                  * For interoperability it should be OK to always use the
 808                  * maximum version we support in client hello and then rely
 809                  * on the checking of version to ensure the servers isn't
 810                  * being inconsistent: for example initially negotiating with
 811                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 812                  * client_version in client hello and not resetting it to
 813                  * the negotiated version.
 814                  */
 815 #if 0
 816                 *(p++)=s->version>>8;
 817                 *(p++)=s->version&0xff;
 818                 s->client_version=s->version;
 819 #else
 820                 *(p++)=s->client_version>>8;
 821                 *(p++)=s->client_version&0xff;
 822 #endif
 823
 824                 /* Random stuff */
 825                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 826                 p+=SSL3_RANDOM_SIZE;
 827
 828                 /* Session ID */
 829                 if (s->new_session)
 830                         i=0;
 831                 else
 832                         i=s->session->session_id_length;
 833                 *(p++)=i;
 834                 if (i != 0)
 835                         {
 836                         if (i > (int)sizeof(s->session->session_id))
 837                                 {
 838                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 839                                 goto err;
 840                                 }
 841                         memcpy(p,s->session->session_id,i);
 842                         p+=i;
 843                         }
 844
 845                 /* cookie stuff for DTLS */
 846                 if (SSL_IS_DTLS(s))
 847                         {
 848                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 849                                 {
 850                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 851                                 goto err;
 852                                 }
 853                         *(p++) = s->d1->cookie_len;
 854                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 855                         p += s->d1->cookie_len;
 856                         }
 857
 858                 /* Ciphers supported */
 859                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 860                 if (i == 0)
 861                         {
 862                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 863                         goto err;
 864                         }
 865 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 866                         /* Some servers hang if client hello > 256 bytes
 867                          * as hack workaround chop number of supported ciphers
 868                          * to keep it well below this if we use TLS v1.2
 869                          */
 870                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 871                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 872                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 873 #endif
 874                 s2n(i,p);
 875                 p+=i;
 876
 877                 /* COMPRESSION */
 878 #ifdef OPENSSL_NO_COMP
 879                 *(p++)=1;
 880 #else
 881
 882                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
 883                         j=0;
 884                 else
 885                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 886                 *(p++)=1+j;
 887                 for (i=0; i<j; i++)
 888                         {
 889                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 890                         *(p++)=comp->id;
 891                         }
 892 #endif
 893                 *(p++)=0; /* Add the NULL method */
 894
 895 #ifndef OPENSSL_NO_TLSEXT
 896                 /* TLS extensions*/
 897                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 898                         {
 899                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 900                         goto err;
 901                         }
 902                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 903                         {
 904                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 905                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 906                         goto err;
 907                         }
 908 #endif
 909
 910                 l= p-d;
 911                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 912                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 913                 }
 914
 915         /* SSL3_ST_CW_CLNT_HELLO_B */
 916         return ssl_do_write(s);
 917 err:
 918         return(-1);
 919         }
 920
 921 int ssl3_get_server_hello(SSL *s)
 922         {
 923         STACK_OF(SSL_CIPHER) *sk;
 924         const SSL_CIPHER *c;
 925         CERT *ct = s->cert;
 926         unsigned char *p,*d;
 927         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 928         unsigned int j;
 929         long n;
 930 #ifndef OPENSSL_NO_COMP
 931         SSL_COMP *comp;
 932 #endif
 933         /* Hello verify request and/or server hello version may not
 934          * match so set first packet if we're negotiating version.
 935          */
 936         if (SSL_IS_DTLS(s))
 937                 s->first_packet = 1;
 938
 939         n=s->method->ssl_get_message(s,
 940                 SSL3_ST_CR_SRVR_HELLO_A,
 941                 SSL3_ST_CR_SRVR_HELLO_B,
 942                 -1,
 943                 20000, /* ?? */
 944                 &ok);
 945
 946         if (!ok) return((int)n);
 947
 948         if (SSL_IS_DTLS(s))
 949                 {
 950                 s->first_packet = 0;
 951                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 952                         {
 953                         if ( s->d1->send_cookie == 0)
 954                                 {
 955                                 s->s3->tmp.reuse_message = 1;
 956                                 return 1;
 957                                 }
 958                         else /* already sent a cookie */
 959                                 {
 960                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 961                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 962                                 goto f_err;
 963                                 }
 964                         }
 965                 }
 966
 967         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 968                 {
 969                 al=SSL_AD_UNEXPECTED_MESSAGE;
 970                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 971                 goto f_err;
 972                 }
 973
 974         d=p=(unsigned char *)s->init_msg;
 975         if (s->method->version == DTLS_ANY_VERSION)
 976                 {
 977                 /* Work out correct protocol version to use */
 978                 int hversion = (p[0] << 8)|p[1];
 979                 int options = s->options;
 980                 if (hversion == DTLS1_2_VERSION
 981                         && !(options & SSL_OP_NO_DTLSv1_2))
 982                         s->method = DTLSv1_2_client_method();
 983                 else if (tls1_suiteb(s))
 984                         {
 985                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 986                         s->version = hversion;
 987                         al = SSL_AD_PROTOCOL_VERSION;
 988                         goto f_err;
 989                         }
 990                 else if (hversion == DTLS1_VERSION
 991                         && !(options & SSL_OP_NO_DTLSv1))
 992                         s->method = DTLSv1_client_method();
 993                 else
 994                         {
 995                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 996                         s->version = hversion;
 997                         al = SSL_AD_PROTOCOL_VERSION;
 998                         goto f_err;
 999                         }
1000                 s->version = s->client_version = s->method->version;
1001                 }
1002
1003         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
1004                 {
1005                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
1006                 s->version=(s->version&0xff00)|p[1];
1007                 al=SSL_AD_PROTOCOL_VERSION;
1008                 goto f_err;
1009                 }
1010         p+=2;
1011
1012         /* load the server hello data */
1013         /* load the server random */
1014         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
1015         p+=SSL3_RANDOM_SIZE;
1016
1017         /* get the session-id */
1018         j= *(p++);
1019
1020         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1021                 {
1022                 al=SSL_AD_ILLEGAL_PARAMETER;
1023                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1024                 goto f_err;
1025                 }
1026
1027 #ifndef OPENSSL_NO_TLSEXT
1028         /* check if we want to resume the session based on external pre-shared secret */
1029         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1030                 {
1031                 SSL_CIPHER *pref_cipher=NULL;
1032                 s->session->master_key_length=sizeof(s->session->master_key);
1033                 if (s->tls_session_secret_cb(s, s->session->master_key,
1034                                              &s->session->master_key_length,
1035                                              NULL, &pref_cipher,
1036                                              s->tls_session_secret_cb_arg))
1037                         {
1038                         s->session->cipher = pref_cipher ?
1039                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1040                         }
1041                 }
1042 #endif /* OPENSSL_NO_TLSEXT */
1043
1044         if (j != 0 && j == s->session->session_id_length
1045             && memcmp(p,s->session->session_id,j) == 0)
1046             {
1047             if(s->sid_ctx_length != s->session->sid_ctx_length
1048                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1049                 {
1050                 /* actually a client application bug */
1051                 al=SSL_AD_ILLEGAL_PARAMETER;
1052                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1053                 goto f_err;
1054                 }
1055             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1056             s->hit=1;
1057             }
1058         else    /* a miss or crap from the other end */
1059                 {
1060                 /* If we were trying for session-id reuse, make a new
1061                  * SSL_SESSION so we don't stuff up other people */
1062                 s->hit=0;
1063                 if (s->session->session_id_length > 0)
1064                         {
1065                         if (!ssl_get_new_session(s,0))
1066                                 {
1067                                 goto f_err;
1068                                 }
1069                         }
1070                 s->session->session_id_length=j;
1071                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1072                 }
1073         p+=j;
1074         c=ssl_get_cipher_by_char(s,p);
1075         if (c == NULL)
1076                 {
1077                 /* unknown cipher */
1078                 al=SSL_AD_ILLEGAL_PARAMETER;
1079                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1080                 goto f_err;
1081                 }
1082         /* Set version disabled mask now we know version */
1083         if (!SSL_USE_TLS1_2_CIPHERS(s))
1084                 ct->mask_ssl = SSL_TLSV1_2;
1085         else
1086                 ct->mask_ssl = 0;
1087         /* If it is a disabled cipher we didn't send it in client hello,
1088          * so return an error.
1089          */
1090         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1091                 {
1092                 al=SSL_AD_ILLEGAL_PARAMETER;
1093                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1094                 goto f_err;
1095                 }
1096         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1097
1098         sk=ssl_get_ciphers_by_id(s);
1099         i=sk_SSL_CIPHER_find(sk,c);
1100         if (i < 0)
1101                 {
1102                 /* we did not say we would use this cipher */
1103                 al=SSL_AD_ILLEGAL_PARAMETER;
1104                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1105                 goto f_err;
1106                 }
1107
1108         /* Depending on the session caching (internal/external), the cipher
1109            and/or cipher_id values may not be set. Make sure that
1110            cipher_id is set and use it for comparison. */
1111         if (s->session->cipher)
1112                 s->session->cipher_id = s->session->cipher->id;
1113         if (s->hit && (s->session->cipher_id != c->id))
1114                 {
1115 /* Workaround is now obsolete */
1116 #if 0
1117                 if (!(s->options &
1118                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1119 #endif
1120                         {
1121                         al=SSL_AD_ILLEGAL_PARAMETER;
1122                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1123                         goto f_err;
1124                         }
1125                 }
1126         s->s3->tmp.new_cipher=c;
1127         /* Don't digest cached records if no sigalgs: we may need them for
1128          * client authentication.
1129          */
1130         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1131                 goto f_err;
1132         /* lets get the compression algorithm */
1133         /* COMPRESSION */
1134 #ifdef OPENSSL_NO_COMP
1135         if (*(p++) != 0)
1136                 {
1137                 al=SSL_AD_ILLEGAL_PARAMETER;
1138                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1139                 goto f_err;
1140                 }
1141         /* If compression is disabled we'd better not try to resume a session
1142          * using compression.
1143          */
1144         if (s->session->compress_meth != 0)
1145                 {
1146                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1147                 goto f_err;
1148                 }
1149 #else
1150         j= *(p++);
1151         if (s->hit && j != s->session->compress_meth)
1152                 {
1153                 al=SSL_AD_ILLEGAL_PARAMETER;
1154                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1155                 goto f_err;
1156                 }
1157         if (j == 0)
1158                 comp=NULL;
1159         else if (!ssl_allow_compression(s))
1160                 {
1161                 al=SSL_AD_ILLEGAL_PARAMETER;
1162                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1163                 goto f_err;
1164                 }
1165         else
1166                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1167
1168         if ((j != 0) && (comp == NULL))
1169                 {
1170                 al=SSL_AD_ILLEGAL_PARAMETER;
1171                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1172                 goto f_err;
1173                 }
1174         else
1175                 {
1176                 s->s3->tmp.new_compression=comp;
1177                 }
1178 #endif
1179
1180 #ifndef OPENSSL_NO_TLSEXT
1181         /* TLS extensions*/
1182         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1183                 {
1184                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1185                 goto err;
1186                 }
1187 #endif
1188
1189         if (p != (d+n))
1190                 {
1191                 /* wrong packet length */
1192                 al=SSL_AD_DECODE_ERROR;
1193                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1194                 goto f_err;
1195                 }
1196
1197         return(1);
1198 f_err:
1199         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1200 err:
1201         return(-1);
1202         }
1203
1204 int ssl3_get_server_certificate(SSL *s)
1205         {
1206         int al,i,ok,ret= -1;
1207         unsigned long n,nc,llen,l;
1208         X509 *x=NULL;
1209         const unsigned char *q,*p;
1210         unsigned char *d;
1211         STACK_OF(X509) *sk=NULL;
1212         SESS_CERT *sc;
1213         EVP_PKEY *pkey=NULL;
1214         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1215
1216         n=s->method->ssl_get_message(s,
1217                 SSL3_ST_CR_CERT_A,
1218                 SSL3_ST_CR_CERT_B,
1219                 -1,
1220                 s->max_cert_list,
1221                 &ok);
1222
1223         if (!ok) return((int)n);
1224
1225         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1226                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1227                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1228                 {
1229                 s->s3->tmp.reuse_message=1;
1230                 return(1);
1231                 }
1232
1233         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1234                 {
1235                 al=SSL_AD_UNEXPECTED_MESSAGE;
1236                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1237                 goto f_err;
1238                 }
1239         p=d=(unsigned char *)s->init_msg;
1240
1241         if ((sk=sk_X509_new_null()) == NULL)
1242                 {
1243                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1244                 goto err;
1245                 }
1246
1247         n2l3(p,llen);
1248         if (llen+3 != n)
1249                 {
1250                 al=SSL_AD_DECODE_ERROR;
1251                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1252                 goto f_err;
1253                 }
1254         for (nc=0; nc<llen; )
1255                 {
1256                 n2l3(p,l);
1257                 if ((l+nc+3) > llen)
1258                         {
1259                         al=SSL_AD_DECODE_ERROR;
1260                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1261                         goto f_err;
1262                         }
1263
1264                 q=p;
1265                 x=d2i_X509(NULL,&q,l);
1266                 if (x == NULL)
1267                         {
1268                         al=SSL_AD_BAD_CERTIFICATE;
1269                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1270                         goto f_err;
1271                         }
1272                 if (q != (p+l))
1273                         {
1274                         al=SSL_AD_DECODE_ERROR;
1275                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1276                         goto f_err;
1277                         }
1278                 if (!sk_X509_push(sk,x))
1279                         {
1280                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1281                         goto err;
1282                         }
1283                 x=NULL;
1284                 nc+=l+3;
1285                 p=q;
1286                 }
1287
1288         i=ssl_verify_cert_chain(s,sk);
1289         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1290 #ifndef OPENSSL_NO_KRB5
1291             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1292                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1293 #endif /* OPENSSL_NO_KRB5 */
1294                 )
1295                 {
1296                 al=ssl_verify_alarm_type(s->verify_result);
1297                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1298                 goto f_err;
1299                 }
1300         ERR_clear_error(); /* but we keep s->verify_result */
1301         if (i > 1)
1302                 {
1303                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1304                 al = SSL_AD_HANDSHAKE_FAILURE;
1305                 goto f_err;
1306                 }
1307
1308         sc=ssl_sess_cert_new();
1309         if (sc == NULL) goto err;
1310
1311         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1312         s->session->sess_cert=sc;
1313
1314         sc->cert_chain=sk;
1315         /* Inconsistency alert: cert_chain does include the peer's
1316          * certificate, which we don't include in s3_srvr.c */
1317         x=sk_X509_value(sk,0);
1318         sk=NULL;
1319         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1320
1321         pkey=X509_get_pubkey(x);
1322
1323         /* VRS: allow null cert if auth == KRB5 */
1324         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1325                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1326                     ? 0 : 1;
1327
1328 #ifdef KSSL_DEBUG
1329         printf("pkey,x = %p, %p\n", pkey,x);
1330         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1331         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1332                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1333 #endif    /* KSSL_DEBUG */
1334
1335         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1336                 {
1337                 x=NULL;
1338                 al=SSL3_AL_FATAL;
1339                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1340                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1341                 goto f_err;
1342                 }
1343
1344         i=ssl_cert_type(x,pkey);
1345         if (need_cert && i < 0)
1346                 {
1347                 x=NULL;
1348                 al=SSL3_AL_FATAL;
1349                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1350                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1351                 goto f_err;
1352                 }
1353
1354         if (need_cert)
1355                 {
1356                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1357                 if (exp_idx >= 0 && i != exp_idx)
1358                         {
1359                         x=NULL;
1360                         al=SSL_AD_ILLEGAL_PARAMETER;
1361                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1362                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1363                         goto f_err;
1364                         }
1365                 sc->peer_cert_type=i;
1366                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1367                 /* Why would the following ever happen?
1368                  * We just created sc a couple of lines ago. */
1369                 if (sc->peer_pkeys[i].x509 != NULL)
1370                         X509_free(sc->peer_pkeys[i].x509);
1371                 sc->peer_pkeys[i].x509=x;
1372                 sc->peer_key= &(sc->peer_pkeys[i]);
1373
1374                 if (s->session->peer != NULL)
1375                         X509_free(s->session->peer);
1376                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1377                 s->session->peer=x;
1378                 }
1379         else
1380                 {
1381                 sc->peer_cert_type=i;
1382                 sc->peer_key= NULL;
1383
1384                 if (s->session->peer != NULL)
1385                         X509_free(s->session->peer);
1386                 s->session->peer=NULL;
1387                 }
1388         s->session->verify_result = s->verify_result;
1389
1390         x=NULL;
1391         ret=1;
1392         if (0)
1393                 {
1394 f_err:
1395                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1396                 }
1397 err:
1398         EVP_PKEY_free(pkey);
1399         X509_free(x);
1400         sk_X509_pop_free(sk,X509_free);
1401         return(ret);
1402         }
1403
1404 int ssl3_get_key_exchange(SSL *s)
1405         {
1406 #ifndef OPENSSL_NO_RSA
1407         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1408 #endif
1409         EVP_MD_CTX md_ctx;
1410         unsigned char *param,*p;
1411         int al,i,j,param_len,ok;
1412         long n,alg_k,alg_a;
1413         EVP_PKEY *pkey=NULL;
1414         const EVP_MD *md = NULL;
1415 #ifndef OPENSSL_NO_RSA
1416         RSA *rsa=NULL;
1417 #endif
1418 #ifndef OPENSSL_NO_DH
1419         DH *dh=NULL;
1420 #endif
1421 #ifndef OPENSSL_NO_ECDH
1422         EC_KEY *ecdh = NULL;
1423         BN_CTX *bn_ctx = NULL;
1424         EC_POINT *srvr_ecpoint = NULL;
1425         int curve_nid = 0;
1426         int encoded_pt_len = 0;
1427 #endif
1428
1429         /* use same message size as in ssl3_get_certificate_request()
1430          * as ServerKeyExchange message may be skipped */
1431         n=s->method->ssl_get_message(s,
1432                 SSL3_ST_CR_KEY_EXCH_A,
1433                 SSL3_ST_CR_KEY_EXCH_B,
1434                 -1,
1435                 s->max_cert_list,
1436                 &ok);
1437         if (!ok) return((int)n);
1438
1439         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1440                 {
1441 #ifndef OPENSSL_NO_PSK
1442                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1443                    omitted if no identity hint is sent. Set
1444                    session->sess_cert anyway to avoid problems
1445                    later.*/
1446                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1447                         {
1448                         s->session->sess_cert=ssl_sess_cert_new();
1449                         if (s->ctx->psk_identity_hint)
1450                                 OPENSSL_free(s->ctx->psk_identity_hint);
1451                         s->ctx->psk_identity_hint = NULL;
1452                         }
1453 #endif
1454                 s->s3->tmp.reuse_message=1;
1455                 return(1);
1456                 }
1457
1458         param=p=(unsigned char *)s->init_msg;
1459         if (s->session->sess_cert != NULL)
1460                 {
1461 #ifndef OPENSSL_NO_RSA
1462                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1463                         {
1464                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1465                         s->session->sess_cert->peer_rsa_tmp=NULL;
1466                         }
1467 #endif
1468 #ifndef OPENSSL_NO_DH
1469                 if (s->session->sess_cert->peer_dh_tmp)
1470                         {
1471                         DH_free(s->session->sess_cert->peer_dh_tmp);
1472                         s->session->sess_cert->peer_dh_tmp=NULL;
1473                         }
1474 #endif
1475 #ifndef OPENSSL_NO_ECDH
1476                 if (s->session->sess_cert->peer_ecdh_tmp)
1477                         {
1478                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1479                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1480                         }
1481 #endif
1482                 }
1483         else
1484                 {
1485                 s->session->sess_cert=ssl_sess_cert_new();
1486                 }
1487
1488         param_len=0;
1489         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1490         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1491         EVP_MD_CTX_init(&md_ctx);
1492
1493 #ifndef OPENSSL_NO_PSK
1494         if (alg_k & SSL_kPSK)
1495                 {
1496                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1497
1498                 al=SSL_AD_HANDSHAKE_FAILURE;
1499                 n2s(p,i);
1500                 param_len=i+2;
1501                 /* Store PSK identity hint for later use, hint is used
1502                  * in ssl3_send_client_key_exchange.  Assume that the
1503                  * maximum length of a PSK identity hint can be as
1504                  * long as the maximum length of a PSK identity. */
1505                 if (i > PSK_MAX_IDENTITY_LEN)
1506                         {
1507                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1508                                 SSL_R_DATA_LENGTH_TOO_LONG);
1509                         goto f_err;
1510                         }
1511                 if (param_len > n)
1512                         {
1513                         al=SSL_AD_DECODE_ERROR;
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1515                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1516                         goto f_err;
1517                         }
1518                 /* If received PSK identity hint contains NULL
1519                  * characters, the hint is truncated from the first
1520                  * NULL. p may not be ending with NULL, so create a
1521                  * NULL-terminated string. */
1522                 memcpy(tmp_id_hint, p, i);
1523                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1524                 if (s->ctx->psk_identity_hint != NULL)
1525                         OPENSSL_free(s->ctx->psk_identity_hint);
1526                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1527                 if (s->ctx->psk_identity_hint == NULL)
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1530                         goto f_err;
1531                         }
1532
1533                 p+=i;
1534                 n-=param_len;
1535                 }
1536         else
1537 #endif /* !OPENSSL_NO_PSK */
1538 #ifndef OPENSSL_NO_SRP
1539         if (alg_k & SSL_kSRP)
1540                 {
1541                 n2s(p,i);
1542                 param_len=i+2;
1543                 if (param_len > n)
1544                         {
1545                         al=SSL_AD_DECODE_ERROR;
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1547                         goto f_err;
1548                         }
1549                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1550                         {
1551                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1552                         goto err;
1553                         }
1554                 p+=i;
1555
1556                 n2s(p,i);
1557                 param_len+=i+2;
1558                 if (param_len > n)
1559                         {
1560                         al=SSL_AD_DECODE_ERROR;
1561                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1562                         goto f_err;
1563                         }
1564                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1565                         {
1566                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1567                         goto err;
1568                         }
1569                 p+=i;
1570
1571                 i = (unsigned int)(p[0]);
1572                 p++;
1573                 param_len+=i+1;
1574                 if (param_len > n)
1575                         {
1576                         al=SSL_AD_DECODE_ERROR;
1577                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1578                         goto f_err;
1579                         }
1580                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1581                         {
1582                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1583                         goto err;
1584                         }
1585                 p+=i;
1586
1587                 n2s(p,i);
1588                 param_len+=i+2;
1589                 if (param_len > n)
1590                         {
1591                         al=SSL_AD_DECODE_ERROR;
1592                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1593                         goto f_err;
1594                         }
1595                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1596                         {
1597                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1598                         goto err;
1599                         }
1600                 p+=i;
1601                 n-=param_len;
1602
1603 /* We must check if there is a certificate */
1604 #ifndef OPENSSL_NO_RSA
1605                 if (alg_a & SSL_aRSA)
1606                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1607 #else
1608                 if (0)
1609                         ;
1610 #endif
1611 #ifndef OPENSSL_NO_DSA
1612                 else if (alg_a & SSL_aDSS)
1613                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1614 #endif
1615                 }
1616         else
1617 #endif /* !OPENSSL_NO_SRP */
1618 #ifndef OPENSSL_NO_RSA
1619         if (alg_k & SSL_kRSA)
1620                 {
1621                 if ((rsa=RSA_new()) == NULL)
1622                         {
1623                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1624                         goto err;
1625                         }
1626                 n2s(p,i);
1627                 param_len=i+2;
1628                 if (param_len > n)
1629                         {
1630                         al=SSL_AD_DECODE_ERROR;
1631                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1632                         goto f_err;
1633                         }
1634                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1635                         {
1636                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1637                         goto err;
1638                         }
1639                 p+=i;
1640
1641                 n2s(p,i);
1642                 param_len+=i+2;
1643                 if (param_len > n)
1644                         {
1645                         al=SSL_AD_DECODE_ERROR;
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1647                         goto f_err;
1648                         }
1649                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1650                         {
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1652                         goto err;
1653                         }
1654                 p+=i;
1655                 n-=param_len;
1656
1657                 /* this should be because we are using an export cipher */
1658                 if (alg_a & SSL_aRSA)
1659                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1660                 else
1661                         {
1662                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1663                         goto err;
1664                         }
1665                 s->session->sess_cert->peer_rsa_tmp=rsa;
1666                 rsa=NULL;
1667                 }
1668 #else /* OPENSSL_NO_RSA */
1669         if (0)
1670                 ;
1671 #endif
1672 #ifndef OPENSSL_NO_DH
1673         else if (alg_k & SSL_kDHE)
1674                 {
1675                 if ((dh=DH_new()) == NULL)
1676                         {
1677                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1678                         goto err;
1679                         }
1680                 n2s(p,i);
1681                 param_len=i+2;
1682                 if (param_len > n)
1683                         {
1684                         al=SSL_AD_DECODE_ERROR;
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1686                         goto f_err;
1687                         }
1688                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1689                         {
1690                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1691                         goto err;
1692                         }
1693                 p+=i;
1694
1695                 n2s(p,i);
1696                 param_len+=i+2;
1697                 if (param_len > n)
1698                         {
1699                         al=SSL_AD_DECODE_ERROR;
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1701                         goto f_err;
1702                         }
1703                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1704                         {
1705                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1706                         goto err;
1707                         }
1708                 p+=i;
1709
1710                 n2s(p,i);
1711                 param_len+=i+2;
1712                 if (param_len > n)
1713                         {
1714                         al=SSL_AD_DECODE_ERROR;
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1716                         goto f_err;
1717                         }
1718                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1719                         {
1720                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1721                         goto err;
1722                         }
1723                 p+=i;
1724                 n-=param_len;
1725
1726                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1727                                                 DH_security_bits(dh), 0, dh))
1728                         {
1729                         al=SSL_AD_HANDSHAKE_FAILURE;
1730                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1731                         goto f_err;
1732                         }
1733
1734 #ifndef OPENSSL_NO_RSA
1735                 if (alg_a & SSL_aRSA)
1736                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1737 #else
1738                 if (0)
1739                         ;
1740 #endif
1741 #ifndef OPENSSL_NO_DSA
1742                 else if (alg_a & SSL_aDSS)
1743                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1744 #endif
1745                 /* else anonymous DH, so no certificate or pkey. */
1746
1747                 s->session->sess_cert->peer_dh_tmp=dh;
1748                 dh=NULL;
1749                 }
1750         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1751                 {
1752                 al=SSL_AD_ILLEGAL_PARAMETER;
1753                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1754                 goto f_err;
1755                 }
1756 #endif /* !OPENSSL_NO_DH */
1757
1758 #ifndef OPENSSL_NO_ECDH
1759         else if (alg_k & SSL_kECDHE)
1760                 {
1761                 EC_GROUP *ngroup;
1762                 const EC_GROUP *group;
1763
1764                 if ((ecdh=EC_KEY_new()) == NULL)
1765                         {
1766                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1767                         goto err;
1768                         }
1769
1770                 /* Extract elliptic curve parameters and the
1771                  * server's ephemeral ECDH public key.
1772                  * Keep accumulating lengths of various components in
1773                  * param_len and make sure it never exceeds n.
1774                  */
1775
1776                 /* XXX: For now we only support named (not generic) curves
1777                  * and the ECParameters in this case is just three bytes.
1778                  */
1779                 param_len=3;
1780                 /* Check curve is one of our preferences, if not server has
1781                  * sent an invalid curve.
1782                  */
1783                 if (!tls1_check_curve(s, p, param_len))
1784                         {
1785                         al=SSL_AD_DECODE_ERROR;
1786                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1787                         goto f_err;
1788                         }
1789
1790                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1791                         {
1792                         al=SSL_AD_INTERNAL_ERROR;
1793                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1794                         goto f_err;
1795                         }
1796
1797                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1798                 if (ngroup == NULL)
1799                         {
1800                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1801                         goto err;
1802                         }
1803                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1804                         {
1805                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1806                         goto err;
1807                         }
1808                 EC_GROUP_free(ngroup);
1809
1810                 group = EC_KEY_get0_group(ecdh);
1811
1812                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1813                     (EC_GROUP_get_degree(group) > 163))
1814                         {
1815                         al=SSL_AD_EXPORT_RESTRICTION;
1816                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1817                         goto f_err;
1818                         }
1819
1820                 p+=3;
1821
1822                 /* Next, get the encoded ECPoint */
1823                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1824                     ((bn_ctx = BN_CTX_new()) == NULL))
1825                         {
1826                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1827                         goto err;
1828                         }
1829
1830                 encoded_pt_len = *p;  /* length of encoded point */
1831                 p+=1;
1832                 param_len += (1 + encoded_pt_len);
1833                 if ((param_len > n) ||
1834                     (EC_POINT_oct2point(group, srvr_ecpoint,
1835                         p, encoded_pt_len, bn_ctx) == 0))
1836                         {
1837                         al=SSL_AD_DECODE_ERROR;
1838                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1839                         goto f_err;
1840                         }
1841
1842                 n-=param_len;
1843                 p+=encoded_pt_len;
1844
1845                 /* The ECC/TLS specification does not mention
1846                  * the use of DSA to sign ECParameters in the server
1847                  * key exchange message. We do support RSA and ECDSA.
1848                  */
1849                 if (0) ;
1850 #ifndef OPENSSL_NO_RSA
1851                 else if (alg_a & SSL_aRSA)
1852                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1853 #endif
1854 #ifndef OPENSSL_NO_ECDSA
1855                 else if (alg_a & SSL_aECDSA)
1856                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1857 #endif
1858                 /* else anonymous ECDH, so no certificate or pkey. */
1859                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1860                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1861                 ecdh=NULL;
1862                 BN_CTX_free(bn_ctx);
1863                 bn_ctx = NULL;
1864                 EC_POINT_free(srvr_ecpoint);
1865                 srvr_ecpoint = NULL;
1866                 }
1867         else if (alg_k)
1868                 {
1869                 al=SSL_AD_UNEXPECTED_MESSAGE;
1870                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1871                 goto f_err;
1872                 }
1873 #endif /* !OPENSSL_NO_ECDH */
1874
1875
1876         /* p points to the next byte, there are 'n' bytes left */
1877
1878         /* if it was signed, check the signature */
1879         if (pkey != NULL)
1880                 {
1881                 if (SSL_USE_SIGALGS(s))
1882                         {
1883                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1884                         if (rv == -1)
1885                                 goto err;
1886                         else if (rv == 0)
1887                                 {
1888                                 al = SSL_AD_DECODE_ERROR;
1889                                 goto f_err;
1890                                 }
1891 #ifdef SSL_DEBUG
1892 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1893 #endif
1894                         p += 2;
1895                         n -= 2;
1896                         }
1897                 else
1898                         md = EVP_sha1();
1899
1900                 n2s(p,i);
1901                 n-=2;
1902                 j=EVP_PKEY_size(pkey);
1903
1904                 if ((i != n) || (n > j) || (n <= 0))
1905                         {
1906                         /* wrong packet length */
1907                         al=SSL_AD_DECODE_ERROR;
1908                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1909                         goto f_err;
1910                         }
1911
1912 #ifndef OPENSSL_NO_RSA
1913                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1914                         {
1915                         int num;
1916
1917                         j=0;
1918                         q=md_buf;
1919                         for (num=2; num > 0; num--)
1920                                 {
1921                                 EVP_MD_CTX_set_flags(&md_ctx,
1922                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1923                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1924                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1925                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1926                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1927                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1928                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1929                                 q+=i;
1930                                 j+=i;
1931                                 }
1932                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1933                                                                 pkey->pkey.rsa);
1934                         if (i < 0)
1935                                 {
1936                                 al=SSL_AD_DECRYPT_ERROR;
1937                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1938                                 goto f_err;
1939                                 }
1940                         if (i == 0)
1941                                 {
1942                                 /* bad signature */
1943                                 al=SSL_AD_DECRYPT_ERROR;
1944                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1945                                 goto f_err;
1946                                 }
1947                         }
1948                 else
1949 #endif
1950                         {
1951                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1952                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1953                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1954                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1955                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1956                                 {
1957                                 /* bad signature */
1958                                 al=SSL_AD_DECRYPT_ERROR;
1959                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1960                                 goto f_err;
1961                                 }
1962                         }
1963                 }
1964         else
1965                 {
1966                 /* aNULL or kPSK do not need public keys */
1967                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1968                         {
1969                         /* Might be wrong key type, check it */
1970                         if (ssl3_check_cert_and_algorithm(s))
1971                                 /* Otherwise this shouldn't happen */
1972                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1973                         goto err;
1974                         }
1975                 /* still data left over */
1976                 if (n != 0)
1977                         {
1978                         al=SSL_AD_DECODE_ERROR;
1979                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1980                         goto f_err;
1981                         }
1982                 }
1983         EVP_PKEY_free(pkey);
1984         EVP_MD_CTX_cleanup(&md_ctx);
1985         return(1);
1986 f_err:
1987         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1988 err:
1989         EVP_PKEY_free(pkey);
1990 #ifndef OPENSSL_NO_RSA
1991         if (rsa != NULL)
1992                 RSA_free(rsa);
1993 #endif
1994 #ifndef OPENSSL_NO_DH
1995         if (dh != NULL)
1996                 DH_free(dh);
1997 #endif
1998 #ifndef OPENSSL_NO_ECDH
1999         BN_CTX_free(bn_ctx);
2000         EC_POINT_free(srvr_ecpoint);
2001         if (ecdh != NULL)
2002                 EC_KEY_free(ecdh);
2003 #endif
2004         EVP_MD_CTX_cleanup(&md_ctx);
2005         return(-1);
2006         }
2007
2008 int ssl3_get_certificate_request(SSL *s)
2009         {
2010         int ok,ret=0;
2011         unsigned long n,nc,l;
2012         unsigned int llen, ctype_num,i;
2013         X509_NAME *xn=NULL;
2014         const unsigned char *p,*q;
2015         unsigned char *d;
2016         STACK_OF(X509_NAME) *ca_sk=NULL;
2017
2018         n=s->method->ssl_get_message(s,
2019                 SSL3_ST_CR_CERT_REQ_A,
2020                 SSL3_ST_CR_CERT_REQ_B,
2021                 -1,
2022                 s->max_cert_list,
2023                 &ok);
2024
2025         if (!ok) return((int)n);
2026
2027         s->s3->tmp.cert_req=0;
2028
2029         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2030                 {
2031                 s->s3->tmp.reuse_message=1;
2032                 /* If we get here we don't need any cached handshake records
2033                  * as we wont be doing client auth.
2034                  */
2035                 if (s->s3->handshake_buffer)
2036                         {
2037                         if (!ssl3_digest_cached_records(s))
2038                                 goto err;
2039                         }
2040                 return(1);
2041                 }
2042
2043         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2044                 {
2045                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2046                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2047                 goto err;
2048                 }
2049
2050         /* TLS does not like anon-DH with client cert */
2051         if (s->version > SSL3_VERSION)
2052                 {
2053                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2054                         {
2055                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2056                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2057                         goto err;
2058                         }
2059                 }
2060
2061         p=d=(unsigned char *)s->init_msg;
2062
2063         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2064                 {
2065                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2066                 goto err;
2067                 }
2068
2069         /* get the certificate types */
2070         ctype_num= *(p++);
2071         if (s->cert->ctypes)
2072                 {
2073                 OPENSSL_free(s->cert->ctypes);
2074                 s->cert->ctypes = NULL;
2075                 }
2076         if (ctype_num > SSL3_CT_NUMBER)
2077                 {
2078                 /* If we exceed static buffer copy all to cert structure */
2079                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2080                 memcpy(s->cert->ctypes, p, ctype_num);
2081                 s->cert->ctype_num = (size_t)ctype_num;
2082                 ctype_num=SSL3_CT_NUMBER;
2083                 }
2084         for (i=0; i<ctype_num; i++)
2085                 s->s3->tmp.ctype[i]= p[i];
2086         p+=p[-1];
2087         if (SSL_USE_SIGALGS(s))
2088                 {
2089                 n2s(p, llen);
2090                 /* Check we have enough room for signature algorithms and
2091                  * following length value.
2092                  */
2093                 if ((unsigned long)(p - d + llen + 2) > n)
2094                         {
2095                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2096                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2097                         goto err;
2098                         }
2099                 /* Clear certificate digests and validity flags */
2100                 for (i = 0; i < SSL_PKEY_NUM; i++)
2101                         {
2102                         s->cert->pkeys[i].digest = NULL;
2103                         s->cert->pkeys[i].valid_flags = 0;
2104                         }
2105                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2106                         {
2107                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2108                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2109                         goto err;
2110                         }
2111                 p += llen;
2112                 }
2113
2114         /* get the CA RDNs */
2115         n2s(p,llen);
2116 #if 0
2117 {
2118 FILE *out;
2119 out=fopen("/tmp/vsign.der","w");
2120 fwrite(p,1,llen,out);
2121 fclose(out);
2122 }
2123 #endif
2124
2125         if ((unsigned long)(p - d + llen) != n)
2126                 {
2127                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2128                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2129                 goto err;
2130                 }
2131
2132         for (nc=0; nc<llen; )
2133                 {
2134                 n2s(p,l);
2135                 if ((l+nc+2) > llen)
2136                         {
2137                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2138                                 goto cont; /* netscape bugs */
2139                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2140                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2141                         goto err;
2142                         }
2143
2144                 q=p;
2145
2146                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2147                         {
2148                         /* If netscape tolerance is on, ignore errors */
2149                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2150                                 goto cont;
2151                         else
2152                                 {
2153                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2154                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2155                                 goto err;
2156                                 }
2157                         }
2158
2159                 if (q != (p+l))
2160                         {
2161                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2162                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2163                         goto err;
2164                         }
2165                 if (!sk_X509_NAME_push(ca_sk,xn))
2166                         {
2167                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2168                         goto err;
2169                         }
2170
2171                 p+=l;
2172                 nc+=l+2;
2173                 }
2174
2175         if (0)
2176                 {
2177 cont:
2178                 ERR_clear_error();
2179                 }
2180
2181         /* we should setup a certificate to return.... */
2182         s->s3->tmp.cert_req=1;
2183         s->s3->tmp.ctype_num=ctype_num;
2184         if (s->s3->tmp.ca_names != NULL)
2185                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2186         s->s3->tmp.ca_names=ca_sk;
2187         ca_sk=NULL;
2188
2189         ret=1;
2190 err:
2191         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2192         return(ret);
2193         }
2194
2195 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2196         {
2197         return(X509_NAME_cmp(*a,*b));
2198         }
2199 #ifndef OPENSSL_NO_TLSEXT
2200 int ssl3_get_new_session_ticket(SSL *s)
2201         {
2202         int ok,al,ret=0, ticklen;
2203         long n;
2204         const unsigned char *p;
2205         unsigned char *d;
2206
2207         n=s->method->ssl_get_message(s,
2208                 SSL3_ST_CR_SESSION_TICKET_A,
2209                 SSL3_ST_CR_SESSION_TICKET_B,
2210                 -1,
2211                 16384,
2212                 &ok);
2213
2214         if (!ok)
2215                 return((int)n);
2216
2217         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2218                 {
2219                 s->s3->tmp.reuse_message=1;
2220                 return(1);
2221                 }
2222         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2223                 {
2224                 al=SSL_AD_UNEXPECTED_MESSAGE;
2225                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2226                 goto f_err;
2227                 }
2228         if (n < 6)
2229                 {
2230                 /* need at least ticket_lifetime_hint + ticket length */
2231                 al = SSL_AD_DECODE_ERROR;
2232                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2233                 goto f_err;
2234                 }
2235
2236         p=d=(unsigned char *)s->init_msg;
2237         n2l(p, s->session->tlsext_tick_lifetime_hint);
2238         n2s(p, ticklen);
2239         /* ticket_lifetime_hint + ticket_length + ticket */
2240         if (ticklen + 6 != n)
2241                 {
2242                 al = SSL_AD_DECODE_ERROR;
2243                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2244                 goto f_err;
2245                 }
2246         if (s->session->tlsext_tick)
2247                 {
2248                 OPENSSL_free(s->session->tlsext_tick);
2249                 s->session->tlsext_ticklen = 0;
2250                 }
2251         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2252         if (!s->session->tlsext_tick)
2253                 {
2254                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2255                 goto err;
2256                 }
2257         memcpy(s->session->tlsext_tick, p, ticklen);
2258         s->session->tlsext_ticklen = ticklen;
2259         /* There are two ways to detect a resumed ticket sesion.
2260          * One is to set an appropriate session ID and then the server
2261          * must return a match in ServerHello. This allows the normal
2262          * client session ID matching to work and we know much
2263          * earlier that the ticket has been accepted.
2264          *
2265          * The other way is to set zero length session ID when the
2266          * ticket is presented and rely on the handshake to determine
2267          * session resumption.
2268          *
2269          * We choose the former approach because this fits in with
2270          * assumptions elsewhere in OpenSSL. The session ID is set
2271          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2272          * ticket.
2273          */
2274         EVP_Digest(p, ticklen,
2275                         s->session->session_id, &s->session->session_id_length,
2276 #ifndef OPENSSL_NO_SHA256
2277                                                         EVP_sha256(), NULL);
2278 #else
2279                                                         EVP_sha1(), NULL);
2280 #endif
2281         ret=1;
2282         return(ret);
2283 f_err:
2284         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2285 err:
2286         return(-1);
2287         }
2288
2289 int ssl3_get_cert_status(SSL *s)
2290         {
2291         int ok, al;
2292         unsigned long resplen,n;
2293         const unsigned char *p;
2294
2295         n=s->method->ssl_get_message(s,
2296                 SSL3_ST_CR_CERT_STATUS_A,
2297                 SSL3_ST_CR_CERT_STATUS_B,
2298                 SSL3_MT_CERTIFICATE_STATUS,
2299                 16384,
2300                 &ok);
2301
2302         if (!ok) return((int)n);
2303         if (n < 4)
2304                 {
2305                 /* need at least status type + length */
2306                 al = SSL_AD_DECODE_ERROR;
2307                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2308                 goto f_err;
2309                 }
2310         p = (unsigned char *)s->init_msg;
2311         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2312                 {
2313                 al = SSL_AD_DECODE_ERROR;
2314                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2315                 goto f_err;
2316                 }
2317         n2l3(p, resplen);
2318         if (resplen + 4 != n)
2319                 {
2320                 al = SSL_AD_DECODE_ERROR;
2321                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2322                 goto f_err;
2323                 }
2324         if (s->tlsext_ocsp_resp)
2325                 OPENSSL_free(s->tlsext_ocsp_resp);
2326         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2327         if (!s->tlsext_ocsp_resp)
2328                 {
2329                 al = SSL_AD_INTERNAL_ERROR;
2330                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2331                 goto f_err;
2332                 }
2333         s->tlsext_ocsp_resplen = resplen;
2334         if (s->ctx->tlsext_status_cb)
2335                 {
2336                 int ret;
2337                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2338                 if (ret == 0)
2339                         {
2340                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2341                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2342                         goto f_err;
2343                         }
2344                 if (ret < 0)
2345                         {
2346                         al = SSL_AD_INTERNAL_ERROR;
2347                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2348                         goto f_err;
2349                         }
2350                 }
2351         return 1;
2352 f_err:
2353         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2354         return(-1);
2355         }
2356 #endif
2357
2358 int ssl3_get_server_done(SSL *s)
2359         {
2360         int ok,ret=0;
2361         long n;
2362
2363         n=s->method->ssl_get_message(s,
2364                 SSL3_ST_CR_SRVR_DONE_A,
2365                 SSL3_ST_CR_SRVR_DONE_B,
2366                 SSL3_MT_SERVER_DONE,
2367                 30, /* should be very small, like 0 :-) */
2368                 &ok);
2369
2370         if (!ok) return((int)n);
2371         if (n > 0)
2372                 {
2373                 /* should contain no data */
2374                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2375                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2376                 return -1;
2377                 }
2378         ret=1;
2379         return(ret);
2380         }
2381
2382
2383 int ssl3_send_client_key_exchange(SSL *s)
2384         {
2385         unsigned char *p;
2386         int n;
2387         unsigned long alg_k;
2388 #ifndef OPENSSL_NO_RSA
2389         unsigned char *q;
2390         EVP_PKEY *pkey=NULL;
2391 #endif
2392 #ifndef OPENSSL_NO_KRB5
2393         KSSL_ERR kssl_err;
2394 #endif /* OPENSSL_NO_KRB5 */
2395 #ifndef OPENSSL_NO_ECDH
2396         EC_KEY *clnt_ecdh = NULL;
2397         const EC_POINT *srvr_ecpoint = NULL;
2398         EVP_PKEY *srvr_pub_pkey = NULL;
2399         unsigned char *encodedPoint = NULL;
2400         int encoded_pt_len = 0;
2401         BN_CTX * bn_ctx = NULL;
2402 #endif
2403
2404         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2405                 {
2406                 p = ssl_handshake_start(s);
2407
2408                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2409
2410                 /* Fool emacs indentation */
2411                 if (0) {}
2412 #ifndef OPENSSL_NO_RSA
2413                 else if (alg_k & SSL_kRSA)
2414                         {
2415                         RSA *rsa;
2416                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2417
2418                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2419                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2420                         else
2421                                 {
2422                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2423                                 if ((pkey == NULL) ||
2424                                         (pkey->type != EVP_PKEY_RSA) ||
2425                                         (pkey->pkey.rsa == NULL))
2426                                         {
2427                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2428                                         goto err;
2429                                         }
2430                                 rsa=pkey->pkey.rsa;
2431                                 EVP_PKEY_free(pkey);
2432                                 }
2433
2434                         tmp_buf[0]=s->client_version>>8;
2435                         tmp_buf[1]=s->client_version&0xff;
2436                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2437                                         goto err;
2438
2439                         s->session->master_key_length=sizeof tmp_buf;
2440
2441                         q=p;
2442                         /* Fix buf for TLS and beyond */
2443                         if (s->version > SSL3_VERSION)
2444                                 p+=2;
2445                         n=RSA_public_encrypt(sizeof tmp_buf,
2446                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2447 #ifdef PKCS1_CHECK
2448                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2449                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2450 #endif
2451                         if (n <= 0)
2452                                 {
2453                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2454                                 goto err;
2455                                 }
2456
2457                         /* Fix buf for TLS and beyond */
2458                         if (s->version > SSL3_VERSION)
2459                                 {
2460                                 s2n(n,q);
2461                                 n+=2;
2462                                 }
2463
2464                         s->session->master_key_length=
2465                                 s->method->ssl3_enc->generate_master_secret(s,
2466                                         s->session->master_key,
2467                                         tmp_buf,sizeof tmp_buf);
2468                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2469                         }
2470 #endif
2471 #ifndef OPENSSL_NO_KRB5
2472                 else if (alg_k & SSL_kKRB5)
2473                         {
2474                         krb5_error_code krb5rc;
2475                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2476                         /*  krb5_data   krb5_ap_req;  */
2477                         krb5_data       *enc_ticket;
2478                         krb5_data       authenticator, *authp = NULL;
2479                         EVP_CIPHER_CTX  ciph_ctx;
2480                         const EVP_CIPHER *enc = NULL;
2481                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2482                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2483                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2484                                                 + EVP_MAX_IV_LENGTH];
2485                         int             padl, outl = sizeof(epms);
2486
2487                         EVP_CIPHER_CTX_init(&ciph_ctx);
2488
2489 #ifdef KSSL_DEBUG
2490                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2491                                 alg_k, SSL_kKRB5);
2492 #endif  /* KSSL_DEBUG */
2493
2494                         authp = NULL;
2495 #ifdef KRB5SENDAUTH
2496                         if (KRB5SENDAUTH)  authp = &authenticator;
2497 #endif  /* KRB5SENDAUTH */
2498
2499                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2500                                 &kssl_err);
2501                         enc = kssl_map_enc(kssl_ctx->enctype);
2502                         if (enc == NULL)
2503                             goto err;
2504 #ifdef KSSL_DEBUG
2505                         {
2506                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2507                         if (krb5rc && kssl_err.text)
2508                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2509                         }
2510 #endif  /* KSSL_DEBUG */
2511
2512                         if (krb5rc)
2513                                 {
2514                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2515                                                 SSL_AD_HANDSHAKE_FAILURE);
2516                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2517                                                 kssl_err.reason);
2518                                 goto err;
2519                                 }
2520
2521                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2522                         **  in place of RFC 2712 KerberosWrapper, as in:
2523                         **
2524                         **  Send ticket (copy to *p, set n = length)
2525                         **  n = krb5_ap_req.length;
2526                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2527                         **  if (krb5_ap_req.data)
2528                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2529                         **
2530                         **  Now using real RFC 2712 KerberosWrapper
2531                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2532                         **  Note: 2712 "opaque" types are here replaced
2533                         **  with a 2-byte length followed by the value.
2534                         **  Example:
2535                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2536                         **  Where "xx xx" = length bytes.  Shown here with
2537                         **  optional authenticator omitted.
2538                         */
2539
2540                         /*  KerberosWrapper.Ticket              */
2541                         s2n(enc_ticket->length,p);
2542                         memcpy(p, enc_ticket->data, enc_ticket->length);
2543                         p+= enc_ticket->length;
2544                         n = enc_ticket->length + 2;
2545
2546                         /*  KerberosWrapper.Authenticator       */
2547                         if (authp  &&  authp->length)
2548                                 {
2549                                 s2n(authp->length,p);
2550                                 memcpy(p, authp->data, authp->length);
2551                                 p+= authp->length;
2552                                 n+= authp->length + 2;
2553
2554                                 free(authp->data);
2555                                 authp->data = NULL;
2556                                 authp->length = 0;
2557                                 }
2558                         else
2559                                 {
2560                                 s2n(0,p);/*  null authenticator length  */
2561                                 n+=2;
2562                                 }
2563
2564                             tmp_buf[0]=s->client_version>>8;
2565                             tmp_buf[1]=s->client_version&0xff;
2566                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2567                                 goto err;
2568
2569                         /*  20010420 VRS.  Tried it this way; failed.
2570                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2571                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2572                         **                              kssl_ctx->length);
2573                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2574                         */
2575
2576                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2577                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2578                                 kssl_ctx->key,iv);
2579                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2580                                 sizeof tmp_buf);
2581                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2582                         outl += padl;
2583                         if (outl > (int)sizeof epms)
2584                                 {
2585                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2586                                 goto err;
2587                                 }
2588                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2589
2590                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2591                         s2n(outl,p);
2592                         memcpy(p, epms, outl);
2593                         p+=outl;
2594                         n+=outl + 2;
2595
2596                         s->session->master_key_length=
2597                                 s->method->ssl3_enc->generate_master_secret(s,
2598                                         s->session->master_key,
2599                                         tmp_buf, sizeof tmp_buf);
2600
2601                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2602                         OPENSSL_cleanse(epms, outl);
2603                         }
2604 #endif
2605 #ifndef OPENSSL_NO_DH
2606                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2607                         {
2608                         DH *dh_srvr,*dh_clnt;
2609                         SESS_CERT *scert = s->session->sess_cert;
2610
2611                         if (scert == NULL)
2612                                 {
2613                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2614                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2615                                 goto err;
2616                                 }
2617
2618                         if (scert->peer_dh_tmp != NULL)
2619                                 dh_srvr=scert->peer_dh_tmp;
2620                         else
2621                                 {
2622                                 /* we get them from the cert */
2623                                 int idx = scert->peer_cert_type;
2624                                 EVP_PKEY *spkey = NULL;
2625                                 dh_srvr = NULL;
2626                                 if (idx >= 0)
2627                                         spkey = X509_get_pubkey(
2628                                                 scert->peer_pkeys[idx].x509);
2629                                 if (spkey)
2630                                         {
2631                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2632                                         EVP_PKEY_free(spkey);
2633                                         }
2634                                 if (dh_srvr == NULL)
2635                                         {
2636                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2637                                             ERR_R_INTERNAL_ERROR);
2638                                         goto err;
2639                                         }
2640                                 }
2641                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2642                                 {
2643                                 /* Use client certificate key */
2644                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2645                                 dh_clnt = NULL;
2646                                 if (clkey)
2647                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2648                                 if (dh_clnt == NULL)
2649                                         {
2650                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2651                                             ERR_R_INTERNAL_ERROR);
2652                                         goto err;
2653                                         }
2654                                 }
2655                         else
2656                                 {
2657                                 /* generate a new random key */
2658                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2659                                         {
2660                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2661                                         goto err;
2662                                         }
2663                                 if (!DH_generate_key(dh_clnt))
2664                                         {
2665                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2666                                         DH_free(dh_clnt);
2667                                         goto err;
2668                                         }
2669                                 }
2670
2671                         /* use the 'p' output buffer for the DH key, but
2672                          * make sure to clear it out afterwards */
2673
2674                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2675                         if (scert->peer_dh_tmp == NULL)
2676                                 DH_free(dh_srvr);
2677
2678                         if (n <= 0)
2679                                 {
2680                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2681                                 DH_free(dh_clnt);
2682                                 goto err;
2683                                 }
2684
2685                         /* generate master key from the result */
2686                         s->session->master_key_length=
2687                                 s->method->ssl3_enc->generate_master_secret(s,
2688                                         s->session->master_key,p,n);
2689                         /* clean up */
2690                         memset(p,0,n);
2691
2692                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2693                                 n = 0;
2694                         else
2695                                 {
2696                                 /* send off the data */
2697                                 n=BN_num_bytes(dh_clnt->pub_key);
2698                                 s2n(n,p);
2699                                 BN_bn2bin(dh_clnt->pub_key,p);
2700                                 n+=2;
2701                                 }
2702
2703                         DH_free(dh_clnt);
2704
2705                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2706                         }
2707 #endif
2708
2709 #ifndef OPENSSL_NO_ECDH
2710                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2711                         {
2712                         const EC_GROUP *srvr_group = NULL;
2713                         EC_KEY *tkey;
2714                         int ecdh_clnt_cert = 0;
2715                         int field_size = 0;
2716
2717                         if (s->session->sess_cert == NULL)
2718                                 {
2719                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2720                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2721                                 goto err;
2722                                 }
2723
2724                         /* Did we send out the client's
2725                          * ECDH share for use in premaster
2726                          * computation as part of client certificate?
2727                          * If so, set ecdh_clnt_cert to 1.
2728                          */
2729                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2730                                 {
2731                                 /* XXX: For now, we do not support client
2732                                  * authentication using ECDH certificates.
2733                                  * To add such support, one needs to add
2734                                  * code that checks for appropriate
2735                                  * conditions and sets ecdh_clnt_cert to 1.
2736                                  * For example, the cert have an ECC
2737                                  * key on the same curve as the server's
2738                                  * and the key should be authorized for
2739                                  * key agreement.
2740                                  *
2741                                  * One also needs to add code in ssl3_connect
2742                                  * to skip sending the certificate verify
2743                                  * message.
2744                                  *
2745                                  * if ((s->cert->key->privatekey != NULL) &&
2746                                  *     (s->cert->key->privatekey->type ==
2747                                  *      EVP_PKEY_EC) && ...)
2748                                  * ecdh_clnt_cert = 1;
2749                                  */
2750                                 }
2751
2752                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2753                                 {
2754                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2755                                 }
2756                         else
2757                                 {
2758                                 /* Get the Server Public Key from Cert */
2759                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2760                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2761                                 if ((srvr_pub_pkey == NULL) ||
2762                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2763                                     (srvr_pub_pkey->pkey.ec == NULL))
2764                                         {
2765                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2766                                             ERR_R_INTERNAL_ERROR);
2767                                         goto err;
2768                                         }
2769
2770                                 tkey = srvr_pub_pkey->pkey.ec;
2771                                 }
2772
2773                         srvr_group   = EC_KEY_get0_group(tkey);
2774                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2775
2776                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2777                                 {
2778                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2779                                     ERR_R_INTERNAL_ERROR);
2780                                 goto err;
2781                                 }
2782
2783                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2784                                 {
2785                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2786                                 goto err;
2787                                 }
2788
2789                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2790                                 {
2791                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2792                                 goto err;
2793                                 }
2794                         if (ecdh_clnt_cert)
2795                                 {
2796                                 /* Reuse key info from our certificate
2797                                  * We only need our private key to perform
2798                                  * the ECDH computation.
2799                                  */
2800                                 const BIGNUM *priv_key;
2801                                 tkey = s->cert->key->privatekey->pkey.ec;
2802                                 priv_key = EC_KEY_get0_private_key(tkey);
2803                                 if (priv_key == NULL)
2804                                         {
2805                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2806                                         goto err;
2807                                         }
2808                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2809                                         {
2810                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2811                                         goto err;
2812                                         }
2813                                 }
2814                         else
2815                                 {
2816                                 /* Generate a new ECDH key pair */
2817                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2818                                         {
2819                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2820                                         goto err;
2821                                         }
2822                                 }
2823
2824                         /* use the 'p' output buffer for the ECDH key, but
2825                          * make sure to clear it out afterwards
2826                          */
2827
2828                         field_size = EC_GROUP_get_degree(srvr_group);
2829                         if (field_size <= 0)
2830                                 {
2831                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2832                                        ERR_R_ECDH_LIB);
2833                                 goto err;
2834                                 }
2835                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2836                         if (n <= 0)
2837                                 {
2838                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2839                                        ERR_R_ECDH_LIB);
2840                                 goto err;
2841                                 }
2842
2843                         /* generate master key from the result */
2844                         s->session->master_key_length = s->method->ssl3_enc \
2845                             -> generate_master_secret(s,
2846                                 s->session->master_key,
2847                                 p, n);
2848
2849                         memset(p, 0, n); /* clean up */
2850
2851                         if (ecdh_clnt_cert)
2852                                 {
2853                                 /* Send empty client key exch message */
2854                                 n = 0;
2855                                 }
2856                         else
2857                                 {
2858                                 /* First check the size of encoding and
2859                                  * allocate memory accordingly.
2860                                  */
2861                                 encoded_pt_len =
2862                                     EC_POINT_point2oct(srvr_group,
2863                                         EC_KEY_get0_public_key(clnt_ecdh),
2864                                         POINT_CONVERSION_UNCOMPRESSED,
2865                                         NULL, 0, NULL);
2866
2867                                 encodedPoint = (unsigned char *)
2868                                     OPENSSL_malloc(encoded_pt_len *
2869                                         sizeof(unsigned char));
2870                                 bn_ctx = BN_CTX_new();
2871                                 if ((encodedPoint == NULL) ||
2872                                     (bn_ctx == NULL))
2873                                         {
2874                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2875                                         goto err;
2876                                         }
2877
2878                                 /* Encode the public key */
2879                                 n = EC_POINT_point2oct(srvr_group,
2880                                     EC_KEY_get0_public_key(clnt_ecdh),
2881                                     POINT_CONVERSION_UNCOMPRESSED,
2882                                     encodedPoint, encoded_pt_len, bn_ctx);
2883
2884                                 *p = n; /* length of encoded point */
2885                                 /* Encoded point will be copied here */
2886                                 p += 1;
2887                                 /* copy the point */
2888                                 memcpy((unsigned char *)p, encodedPoint, n);
2889                                 /* increment n to account for length field */
2890                                 n += 1;
2891                                 }
2892
2893                         /* Free allocated memory */
2894                         BN_CTX_free(bn_ctx);
2895                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2896                         if (clnt_ecdh != NULL)
2897                                  EC_KEY_free(clnt_ecdh);
2898                         EVP_PKEY_free(srvr_pub_pkey);
2899                         }
2900 #endif /* !OPENSSL_NO_ECDH */
2901                 else if (alg_k & SSL_kGOST)
2902                         {
2903                         /* GOST key exchange message creation */
2904                         EVP_PKEY_CTX *pkey_ctx;
2905                         X509 *peer_cert;
2906                         size_t msglen;
2907                         unsigned int md_len;
2908                         int keytype;
2909                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2910                         EVP_MD_CTX *ukm_hash;
2911                         EVP_PKEY *pub_key;
2912
2913                         /* Get server sertificate PKEY and create ctx from it */
2914                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2915                         if (!peer_cert)
2916                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2917                         if (!peer_cert)         {
2918                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2919                                         goto err;
2920                                 }
2921
2922                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2923                         /* If we have send a certificate, and certificate key
2924
2925                          * parameters match those of server certificate, use
2926                          * certificate key for key exchange
2927                          */
2928
2929                          /* Otherwise, generate ephemeral key pair */
2930
2931                         EVP_PKEY_encrypt_init(pkey_ctx);
2932                           /* Generate session key */
2933                     RAND_bytes(premaster_secret,32);
2934                         /* If we have client certificate, use its secret as peer key */
2935                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2936                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2937                                         /* If there was an error - just ignore it. Ephemeral key
2938                                         * would be used
2939                                         */
2940                                         ERR_clear_error();
2941                                 }
2942                         }
2943                         /* Compute shared IV and store it in algorithm-specific
2944                          * context data */
2945                         ukm_hash = EVP_MD_CTX_create();
2946                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2947                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2948                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2949                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2950                         EVP_MD_CTX_destroy(ukm_hash);
2951                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2952                                 8,shared_ukm)<0) {
2953                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2954                                                 SSL_R_LIBRARY_BUG);
2955                                         goto err;
2956                                 }
2957                         /* Make GOST keytransport blob message */
2958                         /*Encapsulate it into sequence */
2959                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2960                         msglen=255;
2961                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2962                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2963                                         SSL_R_LIBRARY_BUG);
2964                                 goto err;
2965                         }
2966                         if (msglen >= 0x80)
2967                                 {
2968                                 *(p++)=0x81;
2969                                 *(p++)= msglen & 0xff;
2970                                 n=msglen+3;
2971                                 }
2972                         else
2973                                 {
2974                                 *(p++)= msglen & 0xff;
2975                                 n=msglen+2;
2976                                 }
2977                         memcpy(p, tmp, msglen);
2978                         /* Check if pubkey from client certificate was used */
2979                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2980                                 {
2981                                 /* Set flag "skip certificate verify" */
2982                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2983                                 }
2984                         EVP_PKEY_CTX_free(pkey_ctx);
2985                         s->session->master_key_length=
2986                                 s->method->ssl3_enc->generate_master_secret(s,
2987                                         s->session->master_key,premaster_secret,32);
2988                         EVP_PKEY_free(pub_key);
2989
2990                         }
2991 #ifndef OPENSSL_NO_SRP
2992                 else if (alg_k & SSL_kSRP)
2993                         {
2994                         if (s->srp_ctx.A != NULL)
2995                                 {
2996                                 /* send off the data */
2997                                 n=BN_num_bytes(s->srp_ctx.A);
2998                                 s2n(n,p);
2999                                 BN_bn2bin(s->srp_ctx.A,p);
3000                                 n+=2;
3001                                 }
3002                         else
3003                                 {
3004                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3005                                 goto err;
3006                                 }
3007                         if (s->session->srp_username != NULL)
3008                                 OPENSSL_free(s->session->srp_username);
3009                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3010                         if (s->session->srp_username == NULL)
3011                                 {
3012                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3013                                         ERR_R_MALLOC_FAILURE);
3014                                 goto err;
3015                                 }
3016
3017                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3018                                 {
3019                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3020                                 goto err;
3021                                 }
3022                         }
3023 #endif
3024 #ifndef OPENSSL_NO_PSK
3025                 else if (alg_k & SSL_kPSK)
3026                         {
3027                         char identity[PSK_MAX_IDENTITY_LEN];
3028                         unsigned char *t = NULL;
3029                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3030                         unsigned int pre_ms_len = 0, psk_len = 0;
3031                         int psk_err = 1;
3032
3033                         n = 0;
3034                         if (s->psk_client_callback == NULL)
3035                                 {
3036                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3037                                         SSL_R_PSK_NO_CLIENT_CB);
3038                                 goto err;
3039                                 }
3040
3041                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3042                                 identity, PSK_MAX_IDENTITY_LEN,
3043                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3044                         if (psk_len > PSK_MAX_PSK_LEN)
3045                                 {
3046                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3047                                         ERR_R_INTERNAL_ERROR);
3048                                 goto psk_err;
3049                                 }
3050                         else if (psk_len == 0)
3051                                 {
3052                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3053                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3054                                 goto psk_err;
3055                                 }
3056
3057                         /* create PSK pre_master_secret */
3058                         pre_ms_len = 2+psk_len+2+psk_len;
3059                         t = psk_or_pre_ms;
3060                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3061                         s2n(psk_len, t);
3062                         memset(t, 0, psk_len);
3063                         t+=psk_len;
3064                         s2n(psk_len, t);
3065
3066                         if (s->session->psk_identity_hint != NULL)
3067                                 OPENSSL_free(s->session->psk_identity_hint);
3068                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3069                         if (s->ctx->psk_identity_hint != NULL &&
3070                                 s->session->psk_identity_hint == NULL)
3071                                 {
3072                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3073                                         ERR_R_MALLOC_FAILURE);
3074                                 goto psk_err;
3075                                 }
3076
3077                         if (s->session->psk_identity != NULL)
3078                                 OPENSSL_free(s->session->psk_identity);
3079                         s->session->psk_identity = BUF_strdup(identity);
3080                         if (s->session->psk_identity == NULL)
3081                                 {
3082                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3083                                         ERR_R_MALLOC_FAILURE);
3084                                 goto psk_err;
3085                                 }
3086
3087                         s->session->master_key_length =
3088                                 s->method->ssl3_enc->generate_master_secret(s,
3089                                         s->session->master_key,
3090                                         psk_or_pre_ms, pre_ms_len);
3091                         n = strlen(identity);
3092                         s2n(n, p);
3093                         memcpy(p, identity, n);
3094                         n+=2;
3095                         psk_err = 0;
3096                 psk_err:
3097                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
3098                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3099                         if (psk_err != 0)
3100                                 {
3101                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3102                                 goto err;
3103                                 }
3104                         }
3105 #endif
3106                 else
3107                         {
3108                         ssl3_send_alert(s, SSL3_AL_FATAL,
3109                             SSL_AD_HANDSHAKE_FAILURE);
3110                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3111                             ERR_R_INTERNAL_ERROR);
3112                         goto err;
3113                         }
3114
3115                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3116                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3117                 }
3118
3119         /* SSL3_ST_CW_KEY_EXCH_B */
3120         return ssl_do_write(s);
3121 err:
3122 #ifndef OPENSSL_NO_ECDH
3123         BN_CTX_free(bn_ctx);
3124         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3125         if (clnt_ecdh != NULL)
3126                 EC_KEY_free(clnt_ecdh);
3127         EVP_PKEY_free(srvr_pub_pkey);
3128 #endif
3129         return(-1);
3130         }
3131
3132 int ssl3_send_client_verify(SSL *s)
3133         {
3134         unsigned char *p;
3135         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3136         EVP_PKEY *pkey;
3137         EVP_PKEY_CTX *pctx=NULL;
3138         EVP_MD_CTX mctx;
3139         unsigned u=0;
3140         unsigned long n;
3141         int j;
3142
3143         EVP_MD_CTX_init(&mctx);
3144
3145         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3146                 {
3147                 p= ssl_handshake_start(s);
3148                 pkey=s->cert->key->privatekey;
3149 /* Create context from key and test if sha1 is allowed as digest */
3150                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3151                 EVP_PKEY_sign_init(pctx);
3152                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3153                         {
3154                         if (!SSL_USE_SIGALGS(s))
3155                                 s->method->ssl3_enc->cert_verify_mac(s,
3156                                                 NID_sha1,
3157                                                 &(data[MD5_DIGEST_LENGTH]));
3158                         }
3159                 else
3160                         {
3161                         ERR_clear_error();
3162                         }
3163                 /* For TLS v1.2 send signature algorithm and signature
3164                  * using agreed digest and cached handshake records.
3165                  */
3166                 if (SSL_USE_SIGALGS(s))
3167                         {
3168                         long hdatalen = 0;
3169                         void *hdata;
3170                         const EVP_MD *md = s->cert->key->digest;
3171                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3172                                                                 &hdata);
3173                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3174                                 {
3175                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3176                                                 ERR_R_INTERNAL_ERROR);
3177                                 goto err;
3178                                 }
3179                         p += 2;
3180 #ifdef SSL_DEBUG
3181                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3182                                                         EVP_MD_name(md));
3183 #endif
3184                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3185                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3186                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3187                                 {
3188                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3189                                                 ERR_R_EVP_LIB);
3190                                 goto err;
3191                                 }
3192                         s2n(u,p);
3193                         n = u + 4;
3194                         if (!ssl3_digest_cached_records(s))
3195                                 goto err;
3196                         }
3197                 else
3198 #ifndef OPENSSL_NO_RSA
3199                 if (pkey->type == EVP_PKEY_RSA)
3200                         {
3201                         s->method->ssl3_enc->cert_verify_mac(s,
3202                                 NID_md5,
3203                                 &(data[0]));
3204                         if (RSA_sign(NID_md5_sha1, data,
3205                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3206                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3207                                 {
3208                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3209                                 goto err;
3210                                 }
3211                         s2n(u,p);
3212                         n=u+2;
3213                         }
3214                 else
3215 #endif
3216 #ifndef OPENSSL_NO_DSA
3217                         if (pkey->type == EVP_PKEY_DSA)
3218                         {
3219                         if (!DSA_sign(pkey->save_type,
3220                                 &(data[MD5_DIGEST_LENGTH]),
3221                                 SHA_DIGEST_LENGTH,&(p[2]),
3222                                 (unsigned int *)&j,pkey->pkey.dsa))
3223                                 {
3224                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3225                                 goto err;
3226                                 }
3227                         s2n(j,p);
3228                         n=j+2;
3229                         }
3230                 else
3231 #endif
3232 #ifndef OPENSSL_NO_ECDSA
3233                         if (pkey->type == EVP_PKEY_EC)
3234                         {
3235                         if (!ECDSA_sign(pkey->save_type,
3236                                 &(data[MD5_DIGEST_LENGTH]),
3237                                 SHA_DIGEST_LENGTH,&(p[2]),
3238                                 (unsigned int *)&j,pkey->pkey.ec))
3239                                 {
3240                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3241                                     ERR_R_ECDSA_LIB);
3242                                 goto err;
3243                                 }
3244                         s2n(j,p);
3245                         n=j+2;
3246                         }
3247                 else
3248 #endif
3249                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3250                 {
3251                 unsigned char signbuf[64];
3252                 int i;
3253                 size_t sigsize=64;
3254                 s->method->ssl3_enc->cert_verify_mac(s,
3255                         NID_id_GostR3411_94,
3256                         data);
3257                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3258                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3259                         ERR_R_INTERNAL_ERROR);
3260                         goto err;
3261                 }
3262                 for (i=63,j=0; i>=0; j++, i--) {
3263                         p[2+j]=signbuf[i];
3264                 }
3265                 s2n(j,p);
3266                 n=j+2;
3267                 }
3268                 else
3269                 {
3270                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3271                         goto err;
3272                 }
3273                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3274                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3275                 }
3276         EVP_MD_CTX_cleanup(&mctx);
3277         EVP_PKEY_CTX_free(pctx);
3278         return ssl_do_write(s);
3279 err:
3280         EVP_MD_CTX_cleanup(&mctx);
3281         EVP_PKEY_CTX_free(pctx);
3282         return(-1);
3283         }
3284
3285 /* Check a certificate can be used for client authentication. Currently
3286  * check cert exists, if we have a suitable digest for TLS 1.2 if
3287  * static DH client certificates can be used and optionally checks
3288  * suitability for Suite B.
3289  */
3290 static int ssl3_check_client_certificate(SSL *s)
3291         {
3292         unsigned long alg_k;
3293         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3294                 return 0;
3295         /* If no suitable signature algorithm can't use certificate */
3296         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3297                 return 0;
3298         /* If strict mode check suitability of chain before using it.
3299          * This also adjusts suite B digest if necessary.
3300          */
3301         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3302                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3303                 return 0;
3304         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3305         /* See if we can use client certificate for fixed DH */
3306         if (alg_k & (SSL_kDHr|SSL_kDHd))
3307                 {
3308                 SESS_CERT *scert = s->session->sess_cert;
3309                 int i = scert->peer_cert_type;
3310                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3311                 clkey = s->cert->key->privatekey;
3312                 /* If client key not DH assume it can be used */
3313                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3314                         return 1;
3315                 if (i >= 0)
3316                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3317                 if (spkey)
3318                         {
3319                         /* Compare server and client parameters */
3320                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3321                         EVP_PKEY_free(spkey);
3322                         if (i != 1)
3323                                 return 0;
3324                         }
3325                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3326                 }
3327         return 1;
3328         }
3329
3330 int ssl3_send_client_certificate(SSL *s)
3331         {
3332         X509 *x509=NULL;
3333         EVP_PKEY *pkey=NULL;
3334         int i;
3335
3336         if (s->state == SSL3_ST_CW_CERT_A)
3337                 {
3338                 /* Let cert callback update client certificates if required */
3339                 if (s->cert->cert_cb)
3340                         {
3341                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3342                         if (i < 0)
3343                                 {
3344                                 s->rwstate=SSL_X509_LOOKUP;
3345                                 return -1;
3346                                 }
3347                         if (i == 0)
3348                                 {
3349                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3350                                 return 0;
3351                                 }
3352                         s->rwstate=SSL_NOTHING;
3353                         }
3354                 if (ssl3_check_client_certificate(s))
3355                         s->state=SSL3_ST_CW_CERT_C;
3356                 else
3357                         s->state=SSL3_ST_CW_CERT_B;
3358                 }
3359
3360         /* We need to get a client cert */
3361         if (s->state == SSL3_ST_CW_CERT_B)
3362                 {
3363                 /* If we get an error, we need to
3364                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3365                  * We then get retied later */
3366                 i=0;
3367                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3368                 if (i < 0)
3369                         {
3370                         s->rwstate=SSL_X509_LOOKUP;
3371                         return(-1);
3372                         }
3373                 s->rwstate=SSL_NOTHING;
3374                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3375                         {
3376                         s->state=SSL3_ST_CW_CERT_B;
3377                         if (    !SSL_use_certificate(s,x509) ||
3378                                 !SSL_use_PrivateKey(s,pkey))
3379                                 i=0;
3380                         }
3381                 else if (i == 1)
3382                         {
3383                         i=0;
3384                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3385                         }
3386
3387                 if (x509 != NULL) X509_free(x509);
3388                 if (pkey != NULL) EVP_PKEY_free(pkey);
3389                 if (i && !ssl3_check_client_certificate(s))
3390                         i = 0;
3391                 if (i == 0)
3392                         {
3393                         if (s->version == SSL3_VERSION)
3394                                 {
3395                                 s->s3->tmp.cert_req=0;
3396                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3397                                 return(1);
3398                                 }
3399                         else
3400                                 {
3401                                 s->s3->tmp.cert_req=2;
3402                                 }
3403                         }
3404
3405                 /* Ok, we have a cert */
3406                 s->state=SSL3_ST_CW_CERT_C;
3407                 }
3408
3409         if (s->state == SSL3_ST_CW_CERT_C)
3410                 {
3411                 s->state=SSL3_ST_CW_CERT_D;
3412                 if (!ssl3_output_cert_chain(s,
3413                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3414                         {
3415                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3416                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3417                         return 0;
3418                         }
3419                 }
3420         /* SSL3_ST_CW_CERT_D */
3421         return ssl_do_write(s);
3422         }
3423
3424 #define has_bits(i,m)   (((i)&(m)) == (m))
3425
3426 int ssl3_check_cert_and_algorithm(SSL *s)
3427         {
3428         int i,idx;
3429         long alg_k,alg_a;
3430         EVP_PKEY *pkey=NULL;
3431         SESS_CERT *sc;
3432 #ifndef OPENSSL_NO_RSA
3433         RSA *rsa;
3434 #endif
3435 #ifndef OPENSSL_NO_DH
3436         DH *dh;
3437 #endif
3438
3439         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3440         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3441
3442         /* we don't have a certificate */
3443         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3444                 return(1);
3445
3446         sc=s->session->sess_cert;
3447         if (sc == NULL)
3448                 {
3449                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3450                 goto err;
3451                 }
3452
3453 #ifndef OPENSSL_NO_RSA
3454         rsa=s->session->sess_cert->peer_rsa_tmp;
3455 #endif
3456 #ifndef OPENSSL_NO_DH
3457         dh=s->session->sess_cert->peer_dh_tmp;