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                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 {
 310 #ifndef OPENSSL_NO_TLSEXT
 311                                 /* The server hello indicated that
 312                                  * an audit proof would follow. */
 313                                 if (s->s3->tlsext_authz_server_promised)
 314                                         s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 315                                 else
 316 #endif
 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 == 2)
 336                                 {
 337                                 s->hit = 1;
 338                                 if (s->tlsext_ticket_expected)
 339                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_FINISHED_A;
 342                                 s->init_num=0;
 343                                 break;
 344                                 }
 345 #endif
 346                         /* Check if it is anon DH/ECDH */
 347                         /* or PSK */
 348                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 349                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 350                                 {
 351                                 ret=ssl3_get_server_certificate(s);
 352                                 if (ret <= 0) goto end;
 353 #ifndef OPENSSL_NO_TLSEXT
 354                                 if (s->tlsext_status_expected)
 355                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 356                                 else
 357                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 358                                 }
 359                         else
 360                                 {
 361                                 skip = 1;
 362                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 363                                 }
 364 #else
 365                                 }
 366                         else
 367                                 skip=1;
 368
 369                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 370 #endif
 371                         s->init_num=0;
 372                         break;
 373
 374                 case SSL3_ST_CR_KEY_EXCH_A:
 375                 case SSL3_ST_CR_KEY_EXCH_B:
 376                         ret=ssl3_get_key_exchange(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_CERT_REQ_A;
 379                         s->init_num=0;
 380
 381                         /* at this point we check that we have the
 382                          * required stuff from the server */
 383                         if (!ssl3_check_cert_and_algorithm(s))
 384                                 {
 385                                 ret= -1;
 386                                 goto end;
 387                                 }
 388                         break;
 389
 390                 case SSL3_ST_CR_CERT_REQ_A:
 391                 case SSL3_ST_CR_CERT_REQ_B:
 392                         ret=ssl3_get_certificate_request(s);
 393                         if (ret <= 0) goto end;
 394                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 395                         s->init_num=0;
 396                         break;
 397
 398                 case SSL3_ST_CR_SRVR_DONE_A:
 399                 case SSL3_ST_CR_SRVR_DONE_B:
 400                         ret=ssl3_get_server_done(s);
 401                         if (ret <= 0) goto end;
 402 #ifndef OPENSSL_NO_SRP
 403                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 404                                 {
 405                                 if ((ret = SRP_Calc_A_param(s))<=0)
 406                                         {
 407                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 408                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 409                                         goto end;
 410                                         }
 411                                 }
 412 #endif
 413                         if (s->s3->tmp.cert_req)
 414                                 s->state=SSL3_ST_CW_CERT_A;
 415                         else
 416                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 417                         s->init_num=0;
 418
 419                         break;
 420
 421                 case SSL3_ST_CW_CERT_A:
 422                 case SSL3_ST_CW_CERT_B:
 423                 case SSL3_ST_CW_CERT_C:
 424                 case SSL3_ST_CW_CERT_D:
 425                         ret=ssl3_send_client_certificate(s);
 426                         if (ret <= 0) goto end;
 427                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 428                         s->init_num=0;
 429                         break;
 430
 431                 case SSL3_ST_CW_KEY_EXCH_A:
 432                 case SSL3_ST_CW_KEY_EXCH_B:
 433                         ret=ssl3_send_client_key_exchange(s);
 434                         if (ret <= 0) goto end;
 435                         /* EAY EAY EAY need to check for DH fix cert
 436                          * sent back */
 437                         /* For TLS, cert_req is set to 2, so a cert chain
 438                          * of nothing is sent, but no verify packet is sent */
 439                         /* XXX: For now, we do not support client
 440                          * authentication in ECDH cipher suites with
 441                          * ECDH (rather than ECDSA) certificates.
 442                          * We need to skip the certificate verify
 443                          * message when client's ECDH public key is sent
 444                          * inside the client certificate.
 445                          */
 446                         if (s->s3->tmp.cert_req == 1)
 447                                 {
 448                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 449                                 }
 450                         else
 451                                 {
 452                                 s->state=SSL3_ST_CW_CHANGE_A;
 453                                 s->s3->change_cipher_spec=0;
 454                                 }
 455                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 456                                 {
 457                                 s->state=SSL3_ST_CW_CHANGE_A;
 458                                 s->s3->change_cipher_spec=0;
 459                                 }
 460
 461                         s->init_num=0;
 462                         break;
 463
 464                 case SSL3_ST_CW_CERT_VRFY_A:
 465                 case SSL3_ST_CW_CERT_VRFY_B:
 466                         ret=ssl3_send_client_verify(s);
 467                         if (ret <= 0) goto end;
 468                         s->state=SSL3_ST_CW_CHANGE_A;
 469                         s->init_num=0;
 470                         s->s3->change_cipher_spec=0;
 471                         break;
 472
 473                 case SSL3_ST_CW_CHANGE_A:
 474                 case SSL3_ST_CW_CHANGE_B:
 475                         ret=ssl3_send_change_cipher_spec(s,
 476                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 477                         if (ret <= 0) goto end;
 478
 479 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 480                         s->state=SSL3_ST_CW_FINISHED_A;
 481 #else
 482                         if (s->s3->next_proto_neg_seen)
 483                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 484                         else
 485                                 s->state=SSL3_ST_CW_FINISHED_A;
 486 #endif
 487                         s->init_num=0;
 488
 489                         s->session->cipher=s->s3->tmp.new_cipher;
 490 #ifdef OPENSSL_NO_COMP
 491                         s->session->compress_meth=0;
 492 #else
 493                         if (s->s3->tmp.new_compression == NULL)
 494                                 s->session->compress_meth=0;
 495                         else
 496                                 s->session->compress_meth=
 497                                         s->s3->tmp.new_compression->id;
 498 #endif
 499                         if (!s->method->ssl3_enc->setup_key_block(s))
 500                                 {
 501                                 ret= -1;
 502                                 goto end;
 503                                 }
 504
 505                         if (!s->method->ssl3_enc->change_cipher_state(s,
 506                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 507                                 {
 508                                 ret= -1;
 509                                 goto end;
 510                                 }
 511
 512                         break;
 513
 514 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 515                 case SSL3_ST_CW_NEXT_PROTO_A:
 516                 case SSL3_ST_CW_NEXT_PROTO_B:
 517                         ret=ssl3_send_next_proto(s);
 518                         if (ret <= 0) goto end;
 519                         s->state=SSL3_ST_CW_FINISHED_A;
 520                         break;
 521 #endif
 522
 523                 case SSL3_ST_CW_FINISHED_A:
 524                 case SSL3_ST_CW_FINISHED_B:
 525                         ret=ssl3_send_finished(s,
 526                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 527                                 s->method->ssl3_enc->client_finished_label,
 528                                 s->method->ssl3_enc->client_finished_label_len);
 529                         if (ret <= 0) goto end;
 530                         s->state=SSL3_ST_CW_FLUSH;
 531
 532                         /* clear flags */
 533                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 534                         if (s->hit)
 535                                 {
 536                                 s->s3->tmp.next_state=SSL_ST_OK;
 537                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 538                                         {
 539                                         s->state=SSL_ST_OK;
 540                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 541                                         s->s3->delay_buf_pop_ret=0;
 542                                         }
 543                                 }
 544                         else
 545                                 {
 546 #ifndef OPENSSL_NO_TLSEXT
 547                                 /* Allow NewSessionTicket if ticket expected */
 548                                 if (s->tlsext_ticket_expected)
 549                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 550                                 else
 551 #endif
 552
 553                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 554                                 }
 555                         s->init_num=0;
 556                         break;
 557
 558 #ifndef OPENSSL_NO_TLSEXT
 559                 case SSL3_ST_CR_SESSION_TICKET_A:
 560                 case SSL3_ST_CR_SESSION_TICKET_B:
 561                         ret=ssl3_get_new_session_ticket(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_CR_FINISHED_A;
 564                         s->init_num=0;
 565                 break;
 566
 567                 case SSL3_ST_CR_CERT_STATUS_A:
 568                 case SSL3_ST_CR_CERT_STATUS_B:
 569                         ret=ssl3_get_cert_status(s);
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 572                         s->init_num=0;
 573                 break;
 574 #endif
 575
 576                 case SSL3_ST_CR_FINISHED_A:
 577                 case SSL3_ST_CR_FINISHED_B:
 578
 579                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 580                                 SSL3_ST_CR_FINISHED_B);
 581                         if (ret <= 0) goto end;
 582
 583                         if (s->hit)
 584                                 s->state=SSL3_ST_CW_CHANGE_A;
 585                         else
 586                                 s->state=SSL_ST_OK;
 587                         s->init_num=0;
 588                         break;
 589
 590                 case SSL3_ST_CW_FLUSH:
 591                         s->rwstate=SSL_WRITING;
 592                         if (BIO_flush(s->wbio) <= 0)
 593                                 {
 594                                 ret= -1;
 595                                 goto end;
 596                                 }
 597                         s->rwstate=SSL_NOTHING;
 598                         s->state=s->s3->tmp.next_state;
 599                         break;
 600
 601                 case SSL_ST_OK:
 602                         /* clean a few things up */
 603                         ssl3_cleanup_key_block(s);
 604
 605                         if (s->init_buf != NULL)
 606                                 {
 607                                 BUF_MEM_free(s->init_buf);
 608                                 s->init_buf=NULL;
 609                                 }
 610
 611                         /* If we are not 'joining' the last two packets,
 612                          * remove the buffering now */
 613                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 614                                 ssl_free_wbio_buffer(s);
 615                         /* else do it later in ssl3_write */
 616
 617                         s->init_num=0;
 618                         s->renegotiate=0;
 619                         s->new_session=0;
 620
 621                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 622                         if (s->hit) s->ctx->stats.sess_hit++;
 623
 624                         ret=1;
 625                         /* s->server=0; */
 626                         s->handshake_func=ssl3_connect;
 627                         s->ctx->stats.sess_connect_good++;
 628
 629                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 630
 631                         goto end;
 632                         /* break; */
 633
 634                 default:
 635                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 636                         ret= -1;
 637                         goto end;
 638                         /* break; */
 639                         }
 640
 641                 /* did we do anything */
 642                 if (!s->s3->tmp.reuse_message && !skip)
 643                         {
 644                         if (s->debug)
 645                                 {
 646                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 647                                         goto end;
 648                                 }
 649
 650                         if ((cb != NULL) && (s->state != state))
 651                                 {
 652                                 new_state=s->state;
 653                                 s->state=state;
 654                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 655                                 s->state=new_state;
 656                                 }
 657                         }
 658                 skip=0;
 659                 }
 660 end:
 661         s->in_handshake--;
 662         if (buf != NULL)
 663                 BUF_MEM_free(buf);
 664         if (cb != NULL)
 665                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 666         return(ret);
 667         }
 668
 669
 670 int ssl3_client_hello(SSL *s)
 671         {
 672         unsigned char *buf;
 673         unsigned char *p,*d;
 674         int i;
 675         unsigned long Time,l;
 676 #ifndef OPENSSL_NO_COMP
 677         int j;
 678         SSL_COMP *comp;
 679 #endif
 680
 681         buf=(unsigned char *)s->init_buf->data;
 682         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 683                 {
 684                 SSL_SESSION *sess = s->session;
 685                 if ((sess == NULL) ||
 686                         (sess->ssl_version != s->version) ||
 687 #ifdef OPENSSL_NO_TLSEXT
 688                         !sess->session_id_length ||
 689 #else
 690                         (!sess->session_id_length && !sess->tlsext_tick) ||
 691 #endif
 692                         (sess->not_resumable))
 693                         {
 694                         if (!ssl_get_new_session(s,0))
 695                                 goto err;
 696                         }
 697                 /* else use the pre-loaded session */
 698
 699                 p=s->s3->client_random;
 700                 Time=(unsigned long)time(NULL);                 /* Time */
 701                 l2n(Time,p);
 702                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 703                         goto err;
 704
 705                 /* Do the message type and length last */
 706                 d=p= &(buf[4]);
 707
 708                 /* version indicates the negotiated version: for example from
 709                  * an SSLv2/v3 compatible client hello). The client_version
 710                  * field is the maximum version we permit and it is also
 711                  * used in RSA encrypted premaster secrets. Some servers can
 712                  * choke if we initially report a higher version then
 713                  * renegotiate to a lower one in the premaster secret. This
 714                  * didn't happen with TLS 1.0 as most servers supported it
 715                  * but it can with TLS 1.1 or later if the server only supports
 716                  * 1.0.
 717                  *
 718                  * Possible scenario with previous logic:
 719                  *      1. Client hello indicates TLS 1.2
 720                  *      2. Server hello says TLS 1.0
 721                  *      3. RSA encrypted premaster secret uses 1.2.
 722                  *      4. Handhaked proceeds using TLS 1.0.
 723                  *      5. Server sends hello request to renegotiate.
 724                  *      6. Client hello indicates TLS v1.0 as we now
 725                  *         know that is maximum server supports.
 726                  *      7. Server chokes on RSA encrypted premaster secret
 727                  *         containing version 1.0.
 728                  *
 729                  * For interoperability it should be OK to always use the
 730                  * maximum version we support in client hello and then rely
 731                  * on the checking of version to ensure the servers isn't
 732                  * being inconsistent: for example initially negotiating with
 733                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 734                  * client_version in client hello and not resetting it to
 735                  * the negotiated version.
 736                  */
 737 #if 0
 738                 *(p++)=s->version>>8;
 739                 *(p++)=s->version&0xff;
 740                 s->client_version=s->version;
 741 #else
 742                 *(p++)=s->client_version>>8;
 743                 *(p++)=s->client_version&0xff;
 744 #endif
 745
 746                 /* Random stuff */
 747                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 748                 p+=SSL3_RANDOM_SIZE;
 749
 750                 /* Session ID */
 751                 if (s->new_session)
 752                         i=0;
 753                 else
 754                         i=s->session->session_id_length;
 755                 *(p++)=i;
 756                 if (i != 0)
 757                         {
 758                         if (i > (int)sizeof(s->session->session_id))
 759                                 {
 760                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 761                                 goto err;
 762                                 }
 763                         memcpy(p,s->session->session_id,i);
 764                         p+=i;
 765                         }
 766
 767                 /* Ciphers supported */
 768                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 769                 if (i == 0)
 770                         {
 771                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 772                         goto err;
 773                         }
 774 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 775                         /* Some servers hang if client hello > 256 bytes
 776                          * as hack workaround chop number of supported ciphers
 777                          * to keep it well below this if we use TLS v1.2
 778                          */
 779                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 780                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 781                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 782 #endif
 783                 s2n(i,p);
 784                 p+=i;
 785
 786                 /* COMPRESSION */
 787 #ifdef OPENSSL_NO_COMP
 788                 *(p++)=1;
 789 #else
 790
 791                 if ((s->options & SSL_OP_NO_COMPRESSION)
 792                                         || !s->ctx->comp_methods)
 793                         j=0;
 794                 else
 795                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 796                 *(p++)=1+j;
 797                 for (i=0; i<j; i++)
 798                         {
 799                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 800                         *(p++)=comp->id;
 801                         }
 802 #endif
 803                 *(p++)=0; /* Add the NULL method */
 804
 805 #ifndef OPENSSL_NO_TLSEXT
 806                 /* TLS extensions*/
 807                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 808                         {
 809                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 810                         goto err;
 811                         }
 812                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 813                         {
 814                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 815                         goto err;
 816                         }
 817 #endif
 818
 819                 l=(p-d);
 820                 d=buf;
 821                 *(d++)=SSL3_MT_CLIENT_HELLO;
 822                 l2n3(l,d);
 823
 824                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 825                 /* number of bytes to write */
 826                 s->init_num=p-buf;
 827                 s->init_off=0;
 828                 }
 829
 830         /* SSL3_ST_CW_CLNT_HELLO_B */
 831         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 832 err:
 833         return(-1);
 834         }
 835
 836 int ssl3_get_server_hello(SSL *s)
 837         {
 838         STACK_OF(SSL_CIPHER) *sk;
 839         const SSL_CIPHER *c;
 840         unsigned char *p,*d;
 841         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 842         unsigned int j;
 843         long n;
 844 #ifndef OPENSSL_NO_COMP
 845         SSL_COMP *comp;
 846 #endif
 847
 848         n=s->method->ssl_get_message(s,
 849                 SSL3_ST_CR_SRVR_HELLO_A,
 850                 SSL3_ST_CR_SRVR_HELLO_B,
 851                 -1,
 852                 20000, /* ?? */
 853                 &ok);
 854
 855         if (!ok) return((int)n);
 856
 857         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 858                 {
 859                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 860                         {
 861                         if ( s->d1->send_cookie == 0)
 862                                 {
 863                                 s->s3->tmp.reuse_message = 1;
 864                                 return 1;
 865                                 }
 866                         else /* already sent a cookie */
 867                                 {
 868                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 869                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 870                                 goto f_err;
 871                                 }
 872                         }
 873                 }
 874
 875         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 876                 {
 877                 al=SSL_AD_UNEXPECTED_MESSAGE;
 878                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 879                 goto f_err;
 880                 }
 881
 882         d=p=(unsigned char *)s->init_msg;
 883
 884         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 885                 {
 886                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 887                 s->version=(s->version&0xff00)|p[1];
 888                 al=SSL_AD_PROTOCOL_VERSION;
 889                 goto f_err;
 890                 }
 891         p+=2;
 892
 893         /* load the server hello data */
 894         /* load the server random */
 895         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 896         p+=SSL3_RANDOM_SIZE;
 897
 898         /* get the session-id */
 899         j= *(p++);
 900
 901         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 902                 {
 903                 al=SSL_AD_ILLEGAL_PARAMETER;
 904                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 905                 goto f_err;
 906                 }
 907
 908 #ifndef OPENSSL_NO_TLSEXT
 909         /* check if we want to resume the session based on external pre-shared secret */
 910         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 911                 {
 912                 SSL_CIPHER *pref_cipher=NULL;
 913                 s->session->master_key_length=sizeof(s->session->master_key);
 914                 if (s->tls_session_secret_cb(s, s->session->master_key,
 915                                              &s->session->master_key_length,
 916                                              NULL, &pref_cipher,
 917                                              s->tls_session_secret_cb_arg))
 918                         {
 919                         s->session->cipher = pref_cipher ?
 920                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 921                         }
 922                 }
 923 #endif /* OPENSSL_NO_TLSEXT */
 924
 925         if (j != 0 && j == s->session->session_id_length
 926             && memcmp(p,s->session->session_id,j) == 0)
 927             {
 928             if(s->sid_ctx_length != s->session->sid_ctx_length
 929                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 930                 {
 931                 /* actually a client application bug */
 932                 al=SSL_AD_ILLEGAL_PARAMETER;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 934                 goto f_err;
 935                 }
 936             s->hit=1;
 937             }
 938         else    /* a miss or crap from the other end */
 939                 {
 940                 /* If we were trying for session-id reuse, make a new
 941                  * SSL_SESSION so we don't stuff up other people */
 942                 s->hit=0;
 943                 if (s->session->session_id_length > 0)
 944                         {
 945                         if (!ssl_get_new_session(s,0))
 946                                 {
 947                                 goto f_err;
 948                                 }
 949                         }
 950                 s->session->session_id_length=j;
 951                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 952                 }
 953         p+=j;
 954         c=ssl_get_cipher_by_char(s,p);
 955         if (c == NULL)
 956                 {
 957                 /* unknown cipher */
 958                 al=SSL_AD_ILLEGAL_PARAMETER;
 959                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 960                 goto f_err;
 961                 }
 962         /* TLS v1.2 only ciphersuites require v1.2 or later */
 963         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 964                 (TLS1_get_version(s) < TLS1_2_VERSION))
 965                 {
 966                 al=SSL_AD_ILLEGAL_PARAMETER;
 967                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 968                 goto f_err;
 969                 }
 970         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 971
 972         sk=ssl_get_ciphers_by_id(s);
 973         i=sk_SSL_CIPHER_find(sk,c);
 974         if (i < 0)
 975                 {
 976                 /* we did not say we would use this cipher */
 977                 al=SSL_AD_ILLEGAL_PARAMETER;
 978                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 979                 goto f_err;
 980                 }
 981
 982         /* Depending on the session caching (internal/external), the cipher
 983            and/or cipher_id values may not be set. Make sure that
 984            cipher_id is set and use it for comparison. */
 985         if (s->session->cipher)
 986                 s->session->cipher_id = s->session->cipher->id;
 987         if (s->hit && (s->session->cipher_id != c->id))
 988                 {
 989 /* Workaround is now obsolete */
 990 #if 0
 991                 if (!(s->options &
 992                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 993 #endif
 994                         {
 995                         al=SSL_AD_ILLEGAL_PARAMETER;
 996                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 997                         goto f_err;
 998                         }
 999                 }
1000         s->s3->tmp.new_cipher=c;
1001         /* Don't digest cached records if TLS v1.2: we may need them for
1002          * client authentication.
1003          */
1004         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1005                 goto f_err;
1006         /* lets get the compression algorithm */
1007         /* COMPRESSION */
1008 #ifdef OPENSSL_NO_COMP
1009         if (*(p++) != 0)
1010                 {
1011                 al=SSL_AD_ILLEGAL_PARAMETER;
1012                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1013                 goto f_err;
1014                 }
1015         /* If compression is disabled we'd better not try to resume a session
1016          * using compression.
1017          */
1018         if (s->session->compress_meth != 0)
1019                 {
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1021                 goto f_err;
1022                 }
1023 #else
1024         j= *(p++);
1025         if (s->hit && j != s->session->compress_meth)
1026                 {
1027                 al=SSL_AD_ILLEGAL_PARAMETER;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1029                 goto f_err;
1030                 }
1031         if (j == 0)
1032                 comp=NULL;
1033         else if (s->options & SSL_OP_NO_COMPRESSION)
1034                 {
1035                 al=SSL_AD_ILLEGAL_PARAMETER;
1036                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1037                 goto f_err;
1038                 }
1039         else
1040                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1041
1042         if ((j != 0) && (comp == NULL))
1043                 {
1044                 al=SSL_AD_ILLEGAL_PARAMETER;
1045                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1046                 goto f_err;
1047                 }
1048         else
1049                 {
1050                 s->s3->tmp.new_compression=comp;
1051                 }
1052 #endif
1053
1054 #ifndef OPENSSL_NO_TLSEXT
1055         /* TLS extensions*/
1056         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1057                 {
1058                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1059                 goto err;
1060                 }
1061 #endif
1062
1063         if (p != (d+n))
1064                 {
1065                 /* wrong packet length */
1066                 al=SSL_AD_DECODE_ERROR;
1067                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1068                 goto f_err;
1069                 }
1070
1071         return(1);
1072 f_err:
1073         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1074 err:
1075         return(-1);
1076         }
1077
1078 int ssl3_get_server_certificate(SSL *s)
1079         {
1080         int al,i,ok,ret= -1;
1081         unsigned long n,nc,llen,l;
1082         X509 *x=NULL;
1083         const unsigned char *q,*p;
1084         unsigned char *d;
1085         STACK_OF(X509) *sk=NULL;
1086         SESS_CERT *sc;
1087         EVP_PKEY *pkey=NULL;
1088         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1089
1090         n=s->method->ssl_get_message(s,
1091                 SSL3_ST_CR_CERT_A,
1092                 SSL3_ST_CR_CERT_B,
1093                 -1,
1094                 s->max_cert_list,
1095                 &ok);
1096
1097         if (!ok) return((int)n);
1098
1099         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1100                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1101                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1102                 {
1103                 s->s3->tmp.reuse_message=1;
1104                 return(1);
1105                 }
1106
1107         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1108                 {
1109                 al=SSL_AD_UNEXPECTED_MESSAGE;
1110                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1111                 goto f_err;
1112                 }
1113         p=d=(unsigned char *)s->init_msg;
1114
1115         if ((sk=sk_X509_new_null()) == NULL)
1116                 {
1117                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1118                 goto err;
1119                 }
1120
1121         n2l3(p,llen);
1122         if (llen+3 != n)
1123                 {
1124                 al=SSL_AD_DECODE_ERROR;
1125                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1126                 goto f_err;
1127                 }
1128         for (nc=0; nc<llen; )
1129                 {
1130                 n2l3(p,l);
1131                 if ((l+nc+3) > llen)
1132                         {
1133                         al=SSL_AD_DECODE_ERROR;
1134                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1135                         goto f_err;
1136                         }
1137
1138                 q=p;
1139                 x=d2i_X509(NULL,&q,l);
1140                 if (x == NULL)
1141                         {
1142                         al=SSL_AD_BAD_CERTIFICATE;
1143                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1144                         goto f_err;
1145                         }
1146                 if (q != (p+l))
1147                         {
1148                         al=SSL_AD_DECODE_ERROR;
1149                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1150                         goto f_err;
1151                         }
1152                 if (!sk_X509_push(sk,x))
1153                         {
1154                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1155                         goto err;
1156                         }
1157                 x=NULL;
1158                 nc+=l+3;
1159                 p=q;
1160                 }
1161
1162         i=ssl_verify_cert_chain(s,sk);
1163         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1164 #ifndef OPENSSL_NO_KRB5
1165             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1166                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1167 #endif /* OPENSSL_NO_KRB5 */
1168                 )
1169                 {
1170                 al=ssl_verify_alarm_type(s->verify_result);
1171                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1172                 goto f_err;
1173                 }
1174         ERR_clear_error(); /* but we keep s->verify_result */
1175
1176         sc=ssl_sess_cert_new();
1177         if (sc == NULL) goto err;
1178
1179         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1180         s->session->sess_cert=sc;
1181
1182         sc->cert_chain=sk;
1183         /* Inconsistency alert: cert_chain does include the peer's
1184          * certificate, which we don't include in s3_srvr.c */
1185         x=sk_X509_value(sk,0);
1186         sk=NULL;
1187         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1188
1189         pkey=X509_get_pubkey(x);
1190
1191         /* VRS: allow null cert if auth == KRB5 */
1192         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1193                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1194                     ? 0 : 1;
1195
1196 #ifdef KSSL_DEBUG
1197         printf("pkey,x = %p, %p\n", pkey,x);
1198         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1199         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1200                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1201 #endif    /* KSSL_DEBUG */
1202
1203         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1204                 {
1205                 x=NULL;
1206                 al=SSL3_AL_FATAL;
1207                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1208                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1209                 goto f_err;
1210                 }
1211
1212         i=ssl_cert_type(x,pkey);
1213         if (need_cert && i < 0)
1214                 {
1215                 x=NULL;
1216                 al=SSL3_AL_FATAL;
1217                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1218                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1219                 goto f_err;
1220                 }
1221
1222         if (need_cert)
1223                 {
1224                 sc->peer_cert_type=i;
1225                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1226                 /* Why would the following ever happen?
1227                  * We just created sc a couple of lines ago. */
1228                 if (sc->peer_pkeys[i].x509 != NULL)
1229                         X509_free(sc->peer_pkeys[i].x509);
1230                 sc->peer_pkeys[i].x509=x;
1231                 sc->peer_key= &(sc->peer_pkeys[i]);
1232
1233                 if (s->session->peer != NULL)
1234                         X509_free(s->session->peer);
1235                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1236                 s->session->peer=x;
1237                 }
1238         else
1239                 {
1240                 sc->peer_cert_type=i;
1241                 sc->peer_key= NULL;
1242
1243                 if (s->session->peer != NULL)
1244                         X509_free(s->session->peer);
1245                 s->session->peer=NULL;
1246                 }
1247         s->session->verify_result = s->verify_result;
1248
1249         x=NULL;
1250 #ifndef OPENSSL_NO_TLSEXT
1251         /* Check the audit proof. */
1252         if (s->ctx->tlsext_authz_server_audit_proof_cb)
1253                 {
1254                 ret = s->ctx->tlsext_authz_server_audit_proof_cb(s,
1255                         s->ctx->tlsext_authz_server_audit_proof_cb_arg);
1256                 if (ret <= 0)
1257                         {
1258                         al = SSL_AD_BAD_CERTIFICATE;
1259                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_INVALID_AUDIT_PROOF);
1260                         goto f_err;
1261                         }
1262                 }
1263
1264 #endif
1265         ret=1;
1266         if (0)
1267                 {
1268 f_err:
1269                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1270                 }
1271 err:
1272         EVP_PKEY_free(pkey);
1273         X509_free(x);
1274         sk_X509_pop_free(sk,X509_free);
1275         return(ret);
1276         }
1277
1278 int ssl3_get_key_exchange(SSL *s)
1279         {
1280 #ifndef OPENSSL_NO_RSA
1281         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1282 #endif
1283         EVP_MD_CTX md_ctx;
1284         unsigned char *param,*p;
1285         int al,i,j,param_len,ok;
1286         long n,alg_k,alg_a;
1287         EVP_PKEY *pkey=NULL;
1288         const EVP_MD *md = NULL;
1289 #ifndef OPENSSL_NO_RSA
1290         RSA *rsa=NULL;
1291 #endif
1292 #ifndef OPENSSL_NO_DH
1293         DH *dh=NULL;
1294 #endif
1295 #ifndef OPENSSL_NO_ECDH
1296         EC_KEY *ecdh = NULL;
1297         BN_CTX *bn_ctx = NULL;
1298         EC_POINT *srvr_ecpoint = NULL;
1299         int curve_nid = 0;
1300         int encoded_pt_len = 0;
1301 #endif
1302
1303         /* use same message size as in ssl3_get_certificate_request()
1304          * as ServerKeyExchange message may be skipped */
1305         n=s->method->ssl_get_message(s,
1306                 SSL3_ST_CR_KEY_EXCH_A,
1307                 SSL3_ST_CR_KEY_EXCH_B,
1308                 -1,
1309                 s->max_cert_list,
1310                 &ok);
1311         if (!ok) return((int)n);
1312
1313         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1314                 {
1315 #ifndef OPENSSL_NO_PSK
1316                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1317                    omitted if no identity hint is sent. Set
1318                    session->sess_cert anyway to avoid problems
1319                    later.*/
1320                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1321                         {
1322                         s->session->sess_cert=ssl_sess_cert_new();
1323                         if (s->ctx->psk_identity_hint)
1324                                 OPENSSL_free(s->ctx->psk_identity_hint);
1325                         s->ctx->psk_identity_hint = NULL;
1326                         }
1327 #endif
1328                 s->s3->tmp.reuse_message=1;
1329                 return(1);
1330                 }
1331
1332         param=p=(unsigned char *)s->init_msg;
1333         if (s->session->sess_cert != NULL)
1334                 {
1335 #ifndef OPENSSL_NO_RSA
1336                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1337                         {
1338                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1339                         s->session->sess_cert->peer_rsa_tmp=NULL;
1340                         }
1341 #endif
1342 #ifndef OPENSSL_NO_DH
1343                 if (s->session->sess_cert->peer_dh_tmp)
1344                         {
1345                         DH_free(s->session->sess_cert->peer_dh_tmp);
1346                         s->session->sess_cert->peer_dh_tmp=NULL;
1347                         }
1348 #endif
1349 #ifndef OPENSSL_NO_ECDH
1350                 if (s->session->sess_cert->peer_ecdh_tmp)
1351                         {
1352                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1353                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1354                         }
1355 #endif
1356                 }
1357         else
1358                 {
1359                 s->session->sess_cert=ssl_sess_cert_new();
1360                 }
1361
1362         param_len=0;
1363         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1364         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1365         EVP_MD_CTX_init(&md_ctx);
1366
1367 #ifndef OPENSSL_NO_PSK
1368         if (alg_k & SSL_kPSK)
1369                 {
1370                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1371
1372                 al=SSL_AD_HANDSHAKE_FAILURE;
1373                 n2s(p,i);
1374                 param_len=i+2;
1375                 /* Store PSK identity hint for later use, hint is used
1376                  * in ssl3_send_client_key_exchange.  Assume that the
1377                  * maximum length of a PSK identity hint can be as
1378                  * long as the maximum length of a PSK identity. */
1379                 if (i > PSK_MAX_IDENTITY_LEN)
1380                         {
1381                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1382                                 SSL_R_DATA_LENGTH_TOO_LONG);
1383                         goto f_err;
1384                         }
1385                 if (param_len > n)
1386                         {
1387                         al=SSL_AD_DECODE_ERROR;
1388                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1389                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1390                         goto f_err;
1391                         }
1392                 /* If received PSK identity hint contains NULL
1393                  * characters, the hint is truncated from the first
1394                  * NULL. p may not be ending with NULL, so create a
1395                  * NULL-terminated string. */
1396                 memcpy(tmp_id_hint, p, i);
1397                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1398                 if (s->ctx->psk_identity_hint != NULL)
1399                         OPENSSL_free(s->ctx->psk_identity_hint);
1400                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1401                 if (s->ctx->psk_identity_hint == NULL)
1402                         {
1403                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1404                         goto f_err;
1405                         }
1406
1407                 p+=i;
1408                 n-=param_len;
1409                 }
1410         else
1411 #endif /* !OPENSSL_NO_PSK */
1412 #ifndef OPENSSL_NO_SRP
1413         if (alg_k & SSL_kSRP)
1414                 {
1415                 n2s(p,i);
1416                 param_len=i+2;
1417                 if (param_len > n)
1418                         {
1419                         al=SSL_AD_DECODE_ERROR;
1420                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1421                         goto f_err;
1422                         }
1423                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1424                         {
1425                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1426                         goto err;
1427                         }
1428                 p+=i;
1429
1430                 n2s(p,i);
1431                 param_len+=i+2;
1432                 if (param_len > n)
1433                         {
1434                         al=SSL_AD_DECODE_ERROR;
1435                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1436                         goto f_err;
1437                         }
1438                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1439                         {
1440                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1441                         goto err;
1442                         }
1443                 p+=i;
1444
1445                 i = (unsigned int)(p[0]);
1446                 p++;
1447                 param_len+=i+1;
1448                 if (param_len > n)
1449                         {
1450                         al=SSL_AD_DECODE_ERROR;
1451                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1452                         goto f_err;
1453                         }
1454                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1455                         {
1456                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1457                         goto err;
1458                         }
1459                 p+=i;
1460
1461                 n2s(p,i);
1462                 param_len+=i+2;
1463                 if (param_len > n)
1464                         {
1465                         al=SSL_AD_DECODE_ERROR;
1466                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1467                         goto f_err;
1468                         }
1469                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1472                         goto err;
1473                         }
1474                 p+=i;
1475                 n-=param_len;
1476
1477 /* We must check if there is a certificate */
1478 #ifndef OPENSSL_NO_RSA
1479                 if (alg_a & SSL_aRSA)
1480                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1481 #else
1482                 if (0)
1483                         ;
1484 #endif
1485 #ifndef OPENSSL_NO_DSA
1486                 else if (alg_a & SSL_aDSS)
1487                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1488 #endif
1489                 }
1490         else
1491 #endif /* !OPENSSL_NO_SRP */
1492 #ifndef OPENSSL_NO_RSA
1493         if (alg_k & SSL_kRSA)
1494                 {
1495                 if ((rsa=RSA_new()) == NULL)
1496                         {
1497                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1498                         goto err;
1499                         }
1500                 n2s(p,i);
1501                 param_len=i+2;
1502                 if (param_len > n)
1503                         {
1504                         al=SSL_AD_DECODE_ERROR;
1505                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1506                         goto f_err;
1507                         }
1508                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1509                         {
1510                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1511                         goto err;
1512                         }
1513                 p+=i;
1514
1515                 n2s(p,i);
1516                 param_len+=i+2;
1517                 if (param_len > n)
1518                         {
1519                         al=SSL_AD_DECODE_ERROR;
1520                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1521                         goto f_err;
1522                         }
1523                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1524                         {
1525                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1526                         goto err;
1527                         }
1528                 p+=i;
1529                 n-=param_len;
1530
1531                 /* this should be because we are using an export cipher */
1532                 if (alg_a & SSL_aRSA)
1533                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1534                 else
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1537                         goto err;
1538                         }
1539                 s->session->sess_cert->peer_rsa_tmp=rsa;
1540                 rsa=NULL;
1541                 }
1542 #else /* OPENSSL_NO_RSA */
1543         if (0)
1544                 ;
1545 #endif
1546 #ifndef OPENSSL_NO_DH
1547         else if (alg_k & SSL_kEDH)
1548                 {
1549                 if ((dh=DH_new()) == NULL)
1550                         {
1551                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1552                         goto err;
1553                         }
1554                 n2s(p,i);
1555                 param_len=i+2;
1556                 if (param_len > n)
1557                         {
1558                         al=SSL_AD_DECODE_ERROR;
1559                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1560                         goto f_err;
1561                         }
1562                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1565                         goto err;
1566                         }
1567                 p+=i;
1568
1569                 n2s(p,i);
1570                 param_len+=i+2;
1571                 if (param_len > n)
1572                         {
1573                         al=SSL_AD_DECODE_ERROR;
1574                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1575                         goto f_err;
1576                         }
1577                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1580                         goto err;
1581                         }
1582                 p+=i;
1583
1584                 n2s(p,i);
1585                 param_len+=i+2;
1586                 if (param_len > n)
1587                         {
1588                         al=SSL_AD_DECODE_ERROR;
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1590                         goto f_err;
1591                         }
1592                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1595                         goto err;
1596                         }
1597                 p+=i;
1598                 n-=param_len;
1599
1600 #ifndef OPENSSL_NO_RSA
1601                 if (alg_a & SSL_aRSA)
1602                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1603 #else
1604                 if (0)
1605                         ;
1606 #endif
1607 #ifndef OPENSSL_NO_DSA
1608                 else if (alg_a & SSL_aDSS)
1609                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1610 #endif
1611                 /* else anonymous DH, so no certificate or pkey. */
1612
1613                 s->session->sess_cert->peer_dh_tmp=dh;
1614                 dh=NULL;
1615                 }
1616         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1617                 {
1618                 al=SSL_AD_ILLEGAL_PARAMETER;
1619                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1620                 goto f_err;
1621                 }
1622 #endif /* !OPENSSL_NO_DH */
1623
1624 #ifndef OPENSSL_NO_ECDH
1625         else if (alg_k & SSL_kEECDH)
1626                 {
1627                 EC_GROUP *ngroup;
1628                 const EC_GROUP *group;
1629
1630                 if ((ecdh=EC_KEY_new()) == NULL)
1631                         {
1632                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1633                         goto err;
1634                         }
1635
1636                 /* Extract elliptic curve parameters and the
1637                  * server's ephemeral ECDH public key.
1638                  * Keep accumulating lengths of various components in
1639                  * param_len and make sure it never exceeds n.
1640                  */
1641
1642                 /* XXX: For now we only support named (not generic) curves
1643                  * and the ECParameters in this case is just three bytes.
1644                  */
1645                 param_len=3;
1646                 if ((param_len > n) ||
1647                     (*p != NAMED_CURVE_TYPE) ||
1648                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1649                         {
1650                         al=SSL_AD_INTERNAL_ERROR;
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1652                         goto f_err;
1653                         }
1654
1655                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1656                 if (ngroup == NULL)
1657                         {
1658                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1659                         goto err;
1660                         }
1661                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1662                         {
1663                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1664                         goto err;
1665                         }
1666                 EC_GROUP_free(ngroup);
1667
1668                 group = EC_KEY_get0_group(ecdh);
1669
1670                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1671                     (EC_GROUP_get_degree(group) > 163))
1672                         {
1673                         al=SSL_AD_EXPORT_RESTRICTION;
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1675                         goto f_err;
1676                         }
1677
1678                 p+=3;
1679
1680                 /* Next, get the encoded ECPoint */
1681                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1682                     ((bn_ctx = BN_CTX_new()) == NULL))
1683                         {
1684                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1685                         goto err;
1686                         }
1687
1688                 encoded_pt_len = *p;  /* length of encoded point */
1689                 p+=1;
1690                 param_len += (1 + encoded_pt_len);
1691                 if ((param_len > n) ||
1692                     (EC_POINT_oct2point(group, srvr_ecpoint,
1693                         p, encoded_pt_len, bn_ctx) == 0))
1694                         {
1695                         al=SSL_AD_DECODE_ERROR;
1696                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1697                         goto f_err;
1698                         }
1699
1700                 n-=param_len;
1701                 p+=encoded_pt_len;
1702
1703                 /* The ECC/TLS specification does not mention
1704                  * the use of DSA to sign ECParameters in the server
1705                  * key exchange message. We do support RSA and ECDSA.
1706                  */
1707                 if (0) ;
1708 #ifndef OPENSSL_NO_RSA
1709                 else if (alg_a & SSL_aRSA)
1710                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1711 #endif
1712 #ifndef OPENSSL_NO_ECDSA
1713                 else if (alg_a & SSL_aECDSA)
1714                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1715 #endif
1716                 /* else anonymous ECDH, so no certificate or pkey. */
1717                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1718                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1719                 ecdh=NULL;
1720                 BN_CTX_free(bn_ctx);
1721                 bn_ctx = NULL;
1722                 EC_POINT_free(srvr_ecpoint);
1723                 srvr_ecpoint = NULL;
1724                 }
1725         else if (alg_k)
1726                 {
1727                 al=SSL_AD_UNEXPECTED_MESSAGE;
1728                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1729                 goto f_err;
1730                 }
1731 #endif /* !OPENSSL_NO_ECDH */
1732
1733
1734         /* p points to the next byte, there are 'n' bytes left */
1735
1736         /* if it was signed, check the signature */
1737         if (pkey != NULL)
1738                 {
1739                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1740                         {
1741                         int sigalg = tls12_get_sigid(pkey);
1742                         /* Should never happen */
1743                         if (sigalg == -1)
1744                                 {
1745                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1746                                 goto err;
1747                                 }
1748                         /* Check key type is consistent with signature */
1749                         if (sigalg != (int)p[1])
1750                                 {
1751                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1752                                 al=SSL_AD_DECODE_ERROR;
1753                                 goto f_err;
1754                                 }
1755                         md = tls12_get_hash(p[0]);
1756                         if (md == NULL)
1757                                 {
1758                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1759                                 al=SSL_AD_DECODE_ERROR;
1760                                 goto f_err;
1761                                 }
1762 #ifdef SSL_DEBUG
1763 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1764 #endif
1765                         p += 2;
1766                         n -= 2;
1767                         }
1768                 else
1769                         md = EVP_sha1();
1770
1771                 n2s(p,i);
1772                 n-=2;
1773                 j=EVP_PKEY_size(pkey);
1774
1775                 if ((i != n) || (n > j) || (n <= 0))
1776                         {
1777                         /* wrong packet length */
1778                         al=SSL_AD_DECODE_ERROR;
1779                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1780                         goto f_err;
1781                         }
1782
1783 #ifndef OPENSSL_NO_RSA
1784                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1785                         {
1786                         int num;
1787
1788                         j=0;
1789                         q=md_buf;
1790                         for (num=2; num > 0; num--)
1791                                 {
1792                                 EVP_MD_CTX_set_flags(&md_ctx,
1793                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1794                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1795                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1796                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1797                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1798                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1799                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1800                                 q+=i;
1801                                 j+=i;
1802                                 }
1803                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1804                                                                 pkey->pkey.rsa);
1805                         if (i < 0)
1806                                 {
1807                                 al=SSL_AD_DECRYPT_ERROR;
1808                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1809                                 goto f_err;
1810                                 }
1811                         if (i == 0)
1812                                 {
1813                                 /* bad signature */
1814                                 al=SSL_AD_DECRYPT_ERROR;
1815                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1816                                 goto f_err;
1817                                 }
1818                         }
1819                 else
1820 #endif
1821                         {
1822                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1823                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1824                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1825                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1826                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1827                                 {
1828                                 /* bad signature */
1829                                 al=SSL_AD_DECRYPT_ERROR;
1830                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1831                                 goto f_err;
1832                                 }
1833                         }
1834                 }
1835         else
1836                 {
1837                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1838                         /* aNULL or kPSK do not need public keys */
1839                         {
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1841                         goto err;
1842                         }
1843                 /* still data left over */
1844                 if (n != 0)
1845                         {
1846                         al=SSL_AD_DECODE_ERROR;
1847                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1848                         goto f_err;
1849                         }
1850                 }
1851         EVP_PKEY_free(pkey);
1852         EVP_MD_CTX_cleanup(&md_ctx);
1853         return(1);
1854 f_err:
1855         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1856 err:
1857         EVP_PKEY_free(pkey);
1858 #ifndef OPENSSL_NO_RSA
1859         if (rsa != NULL)
1860                 RSA_free(rsa);
1861 #endif
1862 #ifndef OPENSSL_NO_DH
1863         if (dh != NULL)
1864                 DH_free(dh);
1865 #endif
1866 #ifndef OPENSSL_NO_ECDH
1867         BN_CTX_free(bn_ctx);
1868         EC_POINT_free(srvr_ecpoint);
1869         if (ecdh != NULL)
1870                 EC_KEY_free(ecdh);
1871 #endif
1872         EVP_MD_CTX_cleanup(&md_ctx);
1873         return(-1);
1874         }
1875
1876 int ssl3_get_certificate_request(SSL *s)
1877         {
1878         int ok,ret=0;
1879         unsigned long n,nc,l;
1880         unsigned int llen, ctype_num,i;
1881         X509_NAME *xn=NULL;
1882         const unsigned char *p,*q;
1883         unsigned char *d;
1884         STACK_OF(X509_NAME) *ca_sk=NULL;
1885
1886         n=s->method->ssl_get_message(s,
1887                 SSL3_ST_CR_CERT_REQ_A,
1888                 SSL3_ST_CR_CERT_REQ_B,
1889                 -1,
1890                 s->max_cert_list,
1891                 &ok);
1892
1893         if (!ok) return((int)n);
1894
1895         s->s3->tmp.cert_req=0;
1896
1897         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1898                 {
1899                 s->s3->tmp.reuse_message=1;
1900                 /* If we get here we don't need any cached handshake records
1901                  * as we wont be doing client auth.
1902                  */
1903                 if (s->s3->handshake_buffer)
1904                         {
1905                         if (!ssl3_digest_cached_records(s))
1906                                 goto err;
1907                         }
1908                 return(1);
1909                 }
1910
1911         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1912                 {
1913                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1914                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1915                 goto err;
1916                 }
1917
1918         /* TLS does not like anon-DH with client cert */
1919         if (s->version > SSL3_VERSION)
1920                 {
1921                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1922                         {
1923                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1924                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1925                         goto err;
1926                         }
1927                 }
1928
1929         p=d=(unsigned char *)s->init_msg;
1930
1931         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1932                 {
1933                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1934                 goto err;
1935                 }
1936
1937         /* get the certificate types */
1938         ctype_num= *(p++);
1939         if (ctype_num > SSL3_CT_NUMBER)
1940                 ctype_num=SSL3_CT_NUMBER;
1941         for (i=0; i<ctype_num; i++)
1942                 s->s3->tmp.ctype[i]= p[i];
1943         p+=ctype_num;
1944         if (TLS1_get_version(s) >= TLS1_2_VERSION)
1945                 {
1946                 n2s(p, llen);
1947                 /* Check we have enough room for signature algorithms and
1948                  * following length value.
1949                  */
1950                 if ((unsigned long)(p - d + llen + 2) > n)
1951                         {
1952                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1953                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1954                         goto err;
1955                         }
1956                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1957                         {
1958                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1959                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1960                         goto err;
1961                         }
1962                 p += llen;
1963                 }
1964
1965         /* get the CA RDNs */
1966         n2s(p,llen);
1967 #if 0
1968 {
1969 FILE *out;
1970 out=fopen("/tmp/vsign.der","w");
1971 fwrite(p,1,llen,out);
1972 fclose(out);
1973 }
1974 #endif
1975
1976         if ((unsigned long)(p - d + llen) != n)
1977                 {
1978                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1979                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1980                 goto err;
1981                 }
1982
1983         for (nc=0; nc<llen; )
1984                 {
1985                 n2s(p,l);
1986                 if ((l+nc+2) > llen)
1987                         {
1988                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1989                                 goto cont; /* netscape bugs */
1990                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1991                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1992                         goto err;
1993                         }
1994
1995                 q=p;
1996
1997                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1998                         {
1999                         /* If netscape tolerance is on, ignore errors */
2000                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2001                                 goto cont;
2002                         else
2003                                 {
2004                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2005                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2006                                 goto err;
2007                                 }
2008                         }
2009
2010                 if (q != (p+l))
2011                         {
2012                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2013                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2014                         goto err;
2015                         }
2016                 if (!sk_X509_NAME_push(ca_sk,xn))
2017                         {
2018                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2019                         goto err;
2020                         }
2021
2022                 p+=l;
2023                 nc+=l+2;
2024                 }
2025
2026         if (0)
2027                 {
2028 cont:
2029                 ERR_clear_error();
2030                 }
2031
2032         /* we should setup a certificate to return.... */
2033         s->s3->tmp.cert_req=1;
2034         s->s3->tmp.ctype_num=ctype_num;
2035         if (s->s3->tmp.ca_names != NULL)
2036                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2037         s->s3->tmp.ca_names=ca_sk;
2038         ca_sk=NULL;
2039
2040         ret=1;
2041 err:
2042         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2043         return(ret);
2044         }
2045
2046 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2047         {
2048         return(X509_NAME_cmp(*a,*b));
2049         }
2050 #ifndef OPENSSL_NO_TLSEXT
2051 int ssl3_get_new_session_ticket(SSL *s)
2052         {
2053         int ok,al,ret=0, ticklen;
2054         long n;
2055         const unsigned char *p;
2056         unsigned char *d;
2057
2058         n=s->method->ssl_get_message(s,
2059                 SSL3_ST_CR_SESSION_TICKET_A,
2060                 SSL3_ST_CR_SESSION_TICKET_B,
2061                 -1,
2062                 16384,
2063                 &ok);
2064
2065         if (!ok)
2066                 return((int)n);
2067
2068         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2069                 {
2070                 s->s3->tmp.reuse_message=1;
2071                 return(1);
2072                 }
2073         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2074                 {
2075                 al=SSL_AD_UNEXPECTED_MESSAGE;
2076                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2077                 goto f_err;
2078                 }
2079         if (n < 6)
2080                 {
2081                 /* need at least ticket_lifetime_hint + ticket length */
2082                 al = SSL_AD_DECODE_ERROR;
2083                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2084                 goto f_err;
2085                 }
2086
2087         p=d=(unsigned char *)s->init_msg;
2088         n2l(p, s->session->tlsext_tick_lifetime_hint);
2089         n2s(p, ticklen);
2090         /* ticket_lifetime_hint + ticket_length + ticket */
2091         if (ticklen + 6 != n)
2092                 {
2093                 al = SSL_AD_DECODE_ERROR;
2094                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2095                 goto f_err;
2096                 }
2097         if (s->session->tlsext_tick)
2098                 {
2099                 OPENSSL_free(s->session->tlsext_tick);
2100                 s->session->tlsext_ticklen = 0;
2101                 }
2102         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2103         if (!s->session->tlsext_tick)
2104                 {
2105                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2106                 goto err;
2107                 }
2108         memcpy(s->session->tlsext_tick, p, ticklen);
2109         s->session->tlsext_ticklen = ticklen;
2110         /* There are two ways to detect a resumed ticket sesion.
2111          * One is to set an appropriate session ID and then the server
2112          * must return a match in ServerHello. This allows the normal
2113          * client session ID matching to work and we know much
2114          * earlier that the ticket has been accepted.
2115          *
2116          * The other way is to set zero length session ID when the
2117          * ticket is presented and rely on the handshake to determine
2118          * session resumption.
2119          *
2120          * We choose the former approach because this fits in with
2121          * assumptions elsewhere in OpenSSL. The session ID is set
2122          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2123          * ticket.
2124          */
2125         EVP_Digest(p, ticklen,
2126                         s->session->session_id, &s->session->session_id_length,
2127 #ifndef OPENSSL_NO_SHA256
2128                                                         EVP_sha256(), NULL);
2129 #else
2130                                                         EVP_sha1(), NULL);
2131 #endif
2132         ret=1;
2133         return(ret);
2134 f_err:
2135         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2136 err:
2137         return(-1);
2138         }
2139
2140 int ssl3_get_cert_status(SSL *s)
2141         {
2142         int ok, al;
2143         unsigned long resplen,n;
2144         const unsigned char *p;
2145
2146         n=s->method->ssl_get_message(s,
2147                 SSL3_ST_CR_CERT_STATUS_A,
2148                 SSL3_ST_CR_CERT_STATUS_B,
2149                 SSL3_MT_CERTIFICATE_STATUS,
2150                 16384,
2151                 &ok);
2152
2153         if (!ok) return((int)n);
2154         if (n < 4)
2155                 {
2156                 /* need at least status type + length */
2157                 al = SSL_AD_DECODE_ERROR;
2158                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2159                 goto f_err;
2160                 }
2161         p = (unsigned char *)s->init_msg;
2162         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2163                 {
2164                 al = SSL_AD_DECODE_ERROR;
2165                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2166                 goto f_err;
2167                 }
2168         n2l3(p, resplen);
2169         if (resplen + 4 != n)
2170                 {
2171                 al = SSL_AD_DECODE_ERROR;
2172                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2173                 goto f_err;
2174                 }
2175         if (s->tlsext_ocsp_resp)
2176                 OPENSSL_free(s->tlsext_ocsp_resp);
2177         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2178         if (!s->tlsext_ocsp_resp)
2179                 {
2180                 al = SSL_AD_INTERNAL_ERROR;
2181                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2182                 goto f_err;
2183                 }
2184         s->tlsext_ocsp_resplen = resplen;
2185         if (s->ctx->tlsext_status_cb)
2186                 {
2187                 int ret;
2188                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2189                 if (ret == 0)
2190                         {
2191                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2192                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2193                         goto f_err;
2194                         }
2195                 if (ret < 0)
2196                         {
2197                         al = SSL_AD_INTERNAL_ERROR;
2198                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2199                         goto f_err;
2200                         }
2201                 }
2202         return 1;
2203 f_err:
2204         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2205         return(-1);
2206         }
2207 #endif
2208
2209 int ssl3_get_server_done(SSL *s)
2210         {
2211         int ok,ret=0;
2212         long n;
2213
2214         n=s->method->ssl_get_message(s,
2215                 SSL3_ST_CR_SRVR_DONE_A,
2216                 SSL3_ST_CR_SRVR_DONE_B,
2217                 SSL3_MT_SERVER_DONE,
2218                 30, /* should be very small, like 0 :-) */
2219                 &ok);
2220
2221         if (!ok) return((int)n);
2222         if (n > 0)
2223                 {
2224                 /* should contain no data */
2225                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2226                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2227                 return -1;
2228                 }
2229         ret=1;
2230         return(ret);
2231         }
2232
2233
2234 int ssl3_send_client_key_exchange(SSL *s)
2235         {
2236         unsigned char *p,*d;
2237         int n;
2238         unsigned long alg_k;
2239 #ifndef OPENSSL_NO_RSA
2240         unsigned char *q;
2241         EVP_PKEY *pkey=NULL;
2242 #endif
2243 #ifndef OPENSSL_NO_KRB5
2244         KSSL_ERR kssl_err;
2245 #endif /* OPENSSL_NO_KRB5 */
2246 #ifndef OPENSSL_NO_ECDH
2247         EC_KEY *clnt_ecdh = NULL;
2248         const EC_POINT *srvr_ecpoint = NULL;
2249         EVP_PKEY *srvr_pub_pkey = NULL;
2250         unsigned char *encodedPoint = NULL;
2251         int encoded_pt_len = 0;
2252         BN_CTX * bn_ctx = NULL;
2253 #endif
2254
2255         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2256                 {
2257                 d=(unsigned char *)s->init_buf->data;
2258                 p= &(d[4]);
2259
2260                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2261
2262                 /* Fool emacs indentation */
2263                 if (0) {}
2264 #ifndef OPENSSL_NO_RSA
2265                 else if (alg_k & SSL_kRSA)
2266                         {
2267                         RSA *rsa;
2268                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2269
2270                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2271                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2272                         else
2273                                 {
2274                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2275                                 if ((pkey == NULL) ||
2276                                         (pkey->type != EVP_PKEY_RSA) ||
2277                                         (pkey->pkey.rsa == NULL))
2278                                         {
2279                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2280                                         goto err;
2281                                         }
2282                                 rsa=pkey->pkey.rsa;
2283                                 EVP_PKEY_free(pkey);
2284                                 }
2285
2286                         tmp_buf[0]=s->client_version>>8;
2287                         tmp_buf[1]=s->client_version&0xff;
2288                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2289                                         goto err;
2290
2291                         s->session->master_key_length=sizeof tmp_buf;
2292
2293                         q=p;
2294                         /* Fix buf for TLS and beyond */
2295                         if (s->version > SSL3_VERSION)
2296                                 p+=2;
2297                         n=RSA_public_encrypt(sizeof tmp_buf,
2298                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2299 #ifdef PKCS1_CHECK
2300                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2301                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2302 #endif
2303                         if (n <= 0)
2304                                 {
2305                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2306                                 goto err;
2307                                 }
2308
2309                         /* Fix buf for TLS and beyond */
2310                         if (s->version > SSL3_VERSION)
2311                                 {
2312                                 s2n(n,q);
2313                                 n+=2;
2314                                 }
2315
2316                         s->session->master_key_length=
2317                                 s->method->ssl3_enc->generate_master_secret(s,
2318                                         s->session->master_key,
2319                                         tmp_buf,sizeof tmp_buf);
2320                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2321                         }
2322 #endif
2323 #ifndef OPENSSL_NO_KRB5
2324                 else if (alg_k & SSL_kKRB5)
2325                         {
2326                         krb5_error_code krb5rc;
2327                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2328                         /*  krb5_data   krb5_ap_req;  */
2329                         krb5_data       *enc_ticket;
2330                         krb5_data       authenticator, *authp = NULL;
2331                         EVP_CIPHER_CTX  ciph_ctx;
2332                         const EVP_CIPHER *enc = NULL;
2333                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2334                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2335                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2336                                                 + EVP_MAX_IV_LENGTH];
2337                         int             padl, outl = sizeof(epms);
2338
2339                         EVP_CIPHER_CTX_init(&ciph_ctx);
2340
2341 #ifdef KSSL_DEBUG
2342                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2343                                 alg_k, SSL_kKRB5);
2344 #endif  /* KSSL_DEBUG */
2345
2346                         authp = NULL;
2347 #ifdef KRB5SENDAUTH
2348                         if (KRB5SENDAUTH)  authp = &authenticator;
2349 #endif  /* KRB5SENDAUTH */
2350
2351                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2352                                 &kssl_err);
2353                         enc = kssl_map_enc(kssl_ctx->enctype);
2354                         if (enc == NULL)
2355                             goto err;
2356 #ifdef KSSL_DEBUG
2357                         {
2358                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2359                         if (krb5rc && kssl_err.text)
2360                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2361                         }
2362 #endif  /* KSSL_DEBUG */
2363
2364                         if (krb5rc)
2365                                 {
2366                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2367                                                 SSL_AD_HANDSHAKE_FAILURE);
2368                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2369                                                 kssl_err.reason);
2370                                 goto err;
2371                                 }
2372
2373                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2374                         **  in place of RFC 2712 KerberosWrapper, as in:
2375                         **
2376                         **  Send ticket (copy to *p, set n = length)
2377                         **  n = krb5_ap_req.length;
2378                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2379                         **  if (krb5_ap_req.data)
2380                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2381                         **
2382                         **  Now using real RFC 2712 KerberosWrapper
2383                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2384                         **  Note: 2712 "opaque" types are here replaced
2385                         **  with a 2-byte length followed by the value.
2386                         **  Example:
2387                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2388                         **  Where "xx xx" = length bytes.  Shown here with
2389                         **  optional authenticator omitted.
2390                         */
2391
2392                         /*  KerberosWrapper.Ticket              */
2393                         s2n(enc_ticket->length,p);
2394                         memcpy(p, enc_ticket->data, enc_ticket->length);
2395                         p+= enc_ticket->length;
2396                         n = enc_ticket->length + 2;
2397
2398                         /*  KerberosWrapper.Authenticator       */
2399                         if (authp  &&  authp->length)
2400                                 {
2401                                 s2n(authp->length,p);
2402                                 memcpy(p, authp->data, authp->length);
2403                                 p+= authp->length;
2404                                 n+= authp->length + 2;
2405
2406                                 free(authp->data);
2407                                 authp->data = NULL;
2408                                 authp->length = 0;
2409                                 }
2410                         else
2411                                 {
2412                                 s2n(0,p);/*  null authenticator length  */
2413                                 n+=2;
2414                                 }
2415
2416                             tmp_buf[0]=s->client_version>>8;
2417                             tmp_buf[1]=s->client_version&0xff;
2418                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2419                                 goto err;
2420
2421                         /*  20010420 VRS.  Tried it this way; failed.
2422                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2423                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2424                         **                              kssl_ctx->length);
2425                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2426                         */
2427
2428                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2429                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2430                                 kssl_ctx->key,iv);
2431                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2432                                 sizeof tmp_buf);
2433                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2434                         outl += padl;
2435                         if (outl > (int)sizeof epms)
2436                                 {
2437                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2438                                 goto err;
2439                                 }
2440                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2441
2442                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2443                         s2n(outl,p);
2444                         memcpy(p, epms, outl);
2445                         p+=outl;
2446                         n+=outl + 2;
2447
2448                         s->session->master_key_length=
2449                                 s->method->ssl3_enc->generate_master_secret(s,
2450                                         s->session->master_key,
2451                                         tmp_buf, sizeof tmp_buf);
2452
2453                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2454                         OPENSSL_cleanse(epms, outl);
2455                         }
2456 #endif
2457 #ifndef OPENSSL_NO_DH
2458                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2459                         {
2460                         DH *dh_srvr,*dh_clnt;
2461                         SESS_CERT *scert = s->session->sess_cert;
2462
2463                         if (scert == NULL)
2464                                 {
2465                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2466                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2467                                 goto err;
2468                                 }
2469
2470                         if (scert->peer_dh_tmp != NULL)
2471                                 dh_srvr=scert->peer_dh_tmp;
2472                         else
2473                                 {
2474                                 /* we get them from the cert */
2475                                 int idx = scert->peer_cert_type;
2476                                 EVP_PKEY *spkey = NULL;
2477                                 dh_srvr = NULL;
2478                                 if (idx >= 0)
2479                                         spkey = X509_get_pubkey(
2480                                                 scert->peer_pkeys[idx].x509);
2481                                 if (spkey)
2482                                         {
2483                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2484                                         EVP_PKEY_free(spkey);
2485                                         }
2486                                 if (dh_srvr == NULL)
2487                                         {
2488                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2489                                             ERR_R_INTERNAL_ERROR);
2490                                         goto err;
2491                                         }
2492                                 }
2493                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2494                                 {
2495                                 /* Use client certificate key */
2496                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2497                                 dh_clnt = NULL;
2498                                 if (clkey)
2499                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2500                                 if (dh_clnt == NULL)
2501                                         {
2502                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2503                                             ERR_R_INTERNAL_ERROR);
2504                                         goto err;
2505                                         }
2506                                 }
2507                         else
2508                                 {
2509                                 /* generate a new random key */
2510                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2511                                         {
2512                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2513                                         goto err;
2514                                         }
2515                                 if (!DH_generate_key(dh_clnt))
2516                                         {
2517                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2518                                         DH_free(dh_clnt);
2519                                         goto err;
2520                                         }
2521                                 }
2522
2523                         /* use the 'p' output buffer for the DH key, but
2524                          * make sure to clear it out afterwards */
2525
2526                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2527                         if (scert->peer_dh_tmp == NULL)
2528                                 DH_free(dh_srvr);
2529
2530                         if (n <= 0)
2531                                 {
2532                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2533                                 DH_free(dh_clnt);
2534                                 goto err;
2535                                 }
2536
2537                         /* generate master key from the result */
2538                         s->session->master_key_length=
2539                                 s->method->ssl3_enc->generate_master_secret(s,
2540                                         s->session->master_key,p,n);
2541                         /* clean up */
2542                         memset(p,0,n);
2543
2544                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2545                                 n = 0;
2546                         else
2547                                 {
2548                                 /* send off the data */
2549                                 n=BN_num_bytes(dh_clnt->pub_key);
2550                                 s2n(n,p);
2551                                 BN_bn2bin(dh_clnt->pub_key,p);
2552                                 n+=2;
2553                                 }
2554
2555                         DH_free(dh_clnt);
2556
2557                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2558                         }
2559 #endif
2560
2561 #ifndef OPENSSL_NO_ECDH
2562                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2563                         {
2564                         const EC_GROUP *srvr_group = NULL;
2565                         EC_KEY *tkey;
2566                         int ecdh_clnt_cert = 0;
2567                         int field_size = 0;
2568
2569                         /* Did we send out the client's
2570                          * ECDH share for use in premaster
2571                          * computation as part of client certificate?
2572                          * If so, set ecdh_clnt_cert to 1.
2573                          */
2574                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2575                                 {
2576                                 /* XXX: For now, we do not support client
2577                                  * authentication using ECDH certificates.
2578                                  * To add such support, one needs to add
2579                                  * code that checks for appropriate
2580                                  * conditions and sets ecdh_clnt_cert to 1.
2581                                  * For example, the cert have an ECC
2582                                  * key on the same curve as the server's
2583                                  * and the key should be authorized for
2584                                  * key agreement.
2585                                  *
2586                                  * One also needs to add code in ssl3_connect
2587                                  * to skip sending the certificate verify
2588                                  * message.
2589                                  *
2590                                  * if ((s->cert->key->privatekey != NULL) &&
2591                                  *     (s->cert->key->privatekey->type ==
2592                                  *      EVP_PKEY_EC) && ...)
2593                                  * ecdh_clnt_cert = 1;
2594                                  */
2595                                 }
2596
2597                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2598                                 {
2599                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2600                                 }
2601                         else
2602                                 {
2603                                 /* Get the Server Public Key from Cert */
2604                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2605                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2606                                 if ((srvr_pub_pkey == NULL) ||
2607                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2608                                     (srvr_pub_pkey->pkey.ec == NULL))
2609                                         {
2610                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2611                                             ERR_R_INTERNAL_ERROR);
2612                                         goto err;
2613                                         }
2614
2615                                 tkey = srvr_pub_pkey->pkey.ec;
2616                                 }
2617
2618                         srvr_group   = EC_KEY_get0_group(tkey);
2619                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2620
2621                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2622                                 {
2623                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2624                                     ERR_R_INTERNAL_ERROR);
2625                                 goto err;
2626                                 }
2627
2628                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2629                                 {
2630                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2631                                 goto err;
2632                                 }
2633
2634                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2635                                 {
2636                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2637                                 goto err;
2638                                 }
2639                         if (ecdh_clnt_cert)
2640                                 {
2641                                 /* Reuse key info from our certificate
2642                                  * We only need our private key to perform
2643                                  * the ECDH computation.
2644                                  */
2645                                 const BIGNUM *priv_key;
2646                                 tkey = s->cert->key->privatekey->pkey.ec;
2647                                 priv_key = EC_KEY_get0_private_key(tkey);
2648                                 if (priv_key == NULL)
2649                                         {
2650                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2651                                         goto err;
2652                                         }
2653                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2654                                         {
2655                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2656                                         goto err;
2657                                         }
2658                                 }
2659                         else
2660                                 {
2661                                 /* Generate a new ECDH key pair */
2662                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2663                                         {
2664                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2665                                         goto err;
2666                                         }
2667                                 }
2668
2669                         /* use the 'p' output buffer for the ECDH key, but
2670                          * make sure to clear it out afterwards
2671                          */
2672
2673                         field_size = EC_GROUP_get_degree(srvr_group);
2674                         if (field_size <= 0)
2675                                 {
2676                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2677                                        ERR_R_ECDH_LIB);
2678                                 goto err;
2679                                 }
2680                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2681                         if (n <= 0)
2682                                 {
2683                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2684                                        ERR_R_ECDH_LIB);
2685                                 goto err;
2686                                 }
2687
2688                         /* generate master key from the result */
2689                         s->session->master_key_length = s->method->ssl3_enc \
2690                             -> generate_master_secret(s,
2691                                 s->session->master_key,
2692                                 p, n);
2693
2694                         memset(p, 0, n); /* clean up */
2695
2696                         if (ecdh_clnt_cert)
2697                                 {
2698                                 /* Send empty client key exch message */
2699                                 n = 0;
2700                                 }
2701                         else
2702                                 {
2703                                 /* First check the size of encoding and
2704                                  * allocate memory accordingly.
2705                                  */
2706                                 encoded_pt_len =
2707                                     EC_POINT_point2oct(srvr_group,
2708                                         EC_KEY_get0_public_key(clnt_ecdh),
2709                                         POINT_CONVERSION_UNCOMPRESSED,
2710                                         NULL, 0, NULL);
2711
2712                                 encodedPoint = (unsigned char *)
2713                                     OPENSSL_malloc(encoded_pt_len *
2714                                         sizeof(unsigned char));
2715                                 bn_ctx = BN_CTX_new();
2716                                 if ((encodedPoint == NULL) ||
2717                                     (bn_ctx == NULL))
2718                                         {
2719                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2720                                         goto err;
2721                                         }
2722
2723                                 /* Encode the public key */
2724                                 n = EC_POINT_point2oct(srvr_group,
2725                                     EC_KEY_get0_public_key(clnt_ecdh),
2726                                     POINT_CONVERSION_UNCOMPRESSED,
2727                                     encodedPoint, encoded_pt_len, bn_ctx);
2728
2729                                 *p = n; /* length of encoded point */
2730                                 /* Encoded point will be copied here */
2731                                 p += 1;
2732                                 /* copy the point */
2733                                 memcpy((unsigned char *)p, encodedPoint, n);
2734                                 /* increment n to account for length field */
2735                                 n += 1;
2736                                 }
2737
2738                         /* Free allocated memory */
2739                         BN_CTX_free(bn_ctx);
2740                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2741                         if (clnt_ecdh != NULL)
2742                                  EC_KEY_free(clnt_ecdh);
2743                         EVP_PKEY_free(srvr_pub_pkey);
2744                         }
2745 #endif /* !OPENSSL_NO_ECDH */
2746                 else if (alg_k & SSL_kGOST)
2747                         {
2748                         /* GOST key exchange message creation */
2749                         EVP_PKEY_CTX *pkey_ctx;
2750                         X509 *peer_cert;
2751                         size_t msglen;
2752                         unsigned int md_len;
2753                         int keytype;
2754                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2755                         EVP_MD_CTX *ukm_hash;
2756                         EVP_PKEY *pub_key;
2757
2758                         /* Get server sertificate PKEY and create ctx from it */
2759                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2760                         if (!peer_cert)
2761                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2762                         if (!peer_cert)         {
2763                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2764                                         goto err;
2765                                 }
2766
2767                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2768                         /* If we have send a certificate, and certificate key
2769
2770                          * parameters match those of server certificate, use
2771                          * certificate key for key exchange
2772                          */
2773
2774                          /* Otherwise, generate ephemeral key pair */
2775
2776                         EVP_PKEY_encrypt_init(pkey_ctx);
2777                           /* Generate session key */
2778                     RAND_bytes(premaster_secret,32);
2779                         /* If we have client certificate, use its secret as peer key */
2780                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2781                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2782                                         /* If there was an error - just ignore it. Ephemeral key
2783                                         * would be used
2784                                         */
2785                                         ERR_clear_error();
2786                                 }
2787                         }
2788                         /* Compute shared IV and store it in algorithm-specific
2789                          * context data */
2790                         ukm_hash = EVP_MD_CTX_create();
2791                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2792                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2793                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2794                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2795                         EVP_MD_CTX_destroy(ukm_hash);
2796                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2797                                 8,shared_ukm)<0) {
2798                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2799                                                 SSL_R_LIBRARY_BUG);
2800                                         goto err;
2801                                 }
2802                         /* Make GOST keytransport blob message */
2803                         /*Encapsulate it into sequence */
2804                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2805                         msglen=255;
2806                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2807                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2808                                         SSL_R_LIBRARY_BUG);
2809                                 goto err;
2810                         }
2811                         if (msglen >= 0x80)
2812                                 {
2813                                 *(p++)=0x81;
2814                                 *(p++)= msglen & 0xff;
2815                                 n=msglen+3;
2816                                 }
2817                         else
2818                                 {
2819                                 *(p++)= msglen & 0xff;
2820                                 n=msglen+2;
2821                                 }
2822                         memcpy(p, tmp, msglen);
2823                         /* Check if pubkey from client certificate was used */
2824                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2825                                 {
2826                                 /* Set flag "skip certificate verify" */
2827                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2828                                 }
2829                         EVP_PKEY_CTX_free(pkey_ctx);
2830                         s->session->master_key_length=
2831                                 s->method->ssl3_enc->generate_master_secret(s,
2832                                         s->session->master_key,premaster_secret,32);
2833                         EVP_PKEY_free(pub_key);
2834
2835                         }
2836 #ifndef OPENSSL_NO_SRP
2837                 else if (alg_k & SSL_kSRP)
2838                         {
2839                         if (s->srp_ctx.A != NULL)
2840                                 {
2841                                 /* send off the data */
2842                                 n=BN_num_bytes(s->srp_ctx.A);
2843                                 s2n(n,p);
2844                                 BN_bn2bin(s->srp_ctx.A,p);
2845                                 n+=2;
2846                                 }
2847                         else
2848                                 {
2849                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2850                                 goto err;
2851                                 }
2852                         if (s->session->srp_username != NULL)
2853                                 OPENSSL_free(s->session->srp_username);
2854                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2855                         if (s->session->srp_username == NULL)
2856                                 {
2857                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2858                                         ERR_R_MALLOC_FAILURE);
2859                                 goto err;
2860                                 }
2861
2862                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2863                                 {
2864                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2865                                 goto err;
2866                                 }
2867                         }
2868 #endif
2869 #ifndef OPENSSL_NO_PSK
2870                 else if (alg_k & SSL_kPSK)
2871                         {
2872                         char identity[PSK_MAX_IDENTITY_LEN];
2873                         unsigned char *t = NULL;
2874                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2875                         unsigned int pre_ms_len = 0, psk_len = 0;
2876                         int psk_err = 1;
2877
2878                         n = 0;
2879                         if (s->psk_client_callback == NULL)
2880                                 {
2881                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2882                                         SSL_R_PSK_NO_CLIENT_CB);
2883                                 goto err;
2884                                 }
2885
2886                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2887                                 identity, PSK_MAX_IDENTITY_LEN,
2888                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2889                         if (psk_len > PSK_MAX_PSK_LEN)
2890                                 {
2891                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2892                                         ERR_R_INTERNAL_ERROR);
2893                                 goto psk_err;
2894                                 }
2895                         else if (psk_len == 0)
2896                                 {
2897                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2898                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2899                                 goto psk_err;
2900                                 }
2901
2902                         /* create PSK pre_master_secret */
2903                         pre_ms_len = 2+psk_len+2+psk_len;
2904                         t = psk_or_pre_ms;
2905                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2906                         s2n(psk_len, t);
2907                         memset(t, 0, psk_len);
2908                         t+=psk_len;
2909                         s2n(psk_len, t);
2910
2911                         if (s->session->psk_identity_hint != NULL)
2912                                 OPENSSL_free(s->session->psk_identity_hint);
2913                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2914                         if (s->ctx->psk_identity_hint != NULL &&
2915                                 s->session->psk_identity_hint == NULL)
2916                                 {
2917                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2918                                         ERR_R_MALLOC_FAILURE);
2919                                 goto psk_err;
2920                                 }
2921
2922                         if (s->session->psk_identity != NULL)
2923                                 OPENSSL_free(s->session->psk_identity);
2924                         s->session->psk_identity = BUF_strdup(identity);
2925                         if (s->session->psk_identity == NULL)
2926                                 {
2927                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2928                                         ERR_R_MALLOC_FAILURE);
2929                                 goto psk_err;
2930                                 }
2931
2932                         s->session->master_key_length =
2933                                 s->method->ssl3_enc->generate_master_secret(s,
2934                                         s->session->master_key,
2935                                         psk_or_pre_ms, pre_ms_len);
2936                         n = strlen(identity);
2937                         s2n(n, p);
2938                         memcpy(p, identity, n);
2939                         n+=2;
2940                         psk_err = 0;
2941                 psk_err:
2942                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2943                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2944                         if (psk_err != 0)
2945                                 {
2946                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2947                                 goto err;
2948                                 }
2949                         }
2950 #endif
2951                 else
2952                         {
2953                         ssl3_send_alert(s, SSL3_AL_FATAL,
2954                             SSL_AD_HANDSHAKE_FAILURE);
2955                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2956                             ERR_R_INTERNAL_ERROR);
2957                         goto err;
2958                         }
2959
2960                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2961                 l2n3(n,d);
2962
2963                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2964                 /* number of bytes to write */
2965                 s->init_num=n+4;
2966                 s->init_off=0;
2967                 }
2968
2969         /* SSL3_ST_CW_KEY_EXCH_B */
2970         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2971 err:
2972 #ifndef OPENSSL_NO_ECDH
2973         BN_CTX_free(bn_ctx);
2974         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2975         if (clnt_ecdh != NULL)
2976                 EC_KEY_free(clnt_ecdh);
2977         EVP_PKEY_free(srvr_pub_pkey);
2978 #endif
2979         return(-1);
2980         }
2981
2982 int ssl3_send_client_verify(SSL *s)
2983         {
2984         unsigned char *p,*d;
2985         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2986         EVP_PKEY *pkey;
2987         EVP_PKEY_CTX *pctx=NULL;
2988         EVP_MD_CTX mctx;
2989         unsigned u=0;
2990         unsigned long n;
2991         int j;
2992
2993         EVP_MD_CTX_init(&mctx);
2994
2995         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2996                 {
2997                 d=(unsigned char *)s->init_buf->data;
2998                 p= &(d[4]);
2999                 pkey=s->cert->key->privatekey;
3000 /* Create context from key and test if sha1 is allowed as digest */
3001                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3002                 EVP_PKEY_sign_init(pctx);
3003                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3004                         {
3005                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3006                                 s->method->ssl3_enc->cert_verify_mac(s,
3007                                                 NID_sha1,
3008                                                 &(data[MD5_DIGEST_LENGTH]));
3009                         }
3010                 else
3011                         {
3012                         ERR_clear_error();
3013                         }
3014                 /* For TLS v1.2 send signature algorithm and signature
3015                  * using agreed digest and cached handshake records.
3016                  */
3017                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3018                         {
3019                         long hdatalen = 0;
3020                         void *hdata;
3021                         const EVP_MD *md = s->cert->key->digest;
3022                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3023                                                                 &hdata);
3024                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3025                                 {
3026                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3027                                                 ERR_R_INTERNAL_ERROR);
3028                                 goto err;
3029                                 }
3030                         p += 2;
3031 #ifdef SSL_DEBUG
3032                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3033                                                         EVP_MD_name(md));
3034 #endif
3035                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3036                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3037                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3038                                 {
3039                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3040                                                 ERR_R_EVP_LIB);
3041                                 goto err;
3042                                 }
3043                         s2n(u,p);
3044                         n = u + 4;
3045                         if (!ssl3_digest_cached_records(s))
3046                                 goto err;
3047                         }
3048                 else
3049 #ifndef OPENSSL_NO_RSA
3050                 if (pkey->type == EVP_PKEY_RSA)
3051                         {
3052                         s->method->ssl3_enc->cert_verify_mac(s,
3053                                 NID_md5,
3054                                 &(data[0]));
3055                         if (RSA_sign(NID_md5_sha1, data,
3056                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3057                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3058                                 {
3059                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3060                                 goto err;
3061                                 }
3062                         s2n(u,p);
3063                         n=u+2;
3064                         }
3065                 else
3066 #endif
3067 #ifndef OPENSSL_NO_DSA
3068                         if (pkey->type == EVP_PKEY_DSA)
3069                         {
3070                         if (!DSA_sign(pkey->save_type,
3071                                 &(data[MD5_DIGEST_LENGTH]),
3072                                 SHA_DIGEST_LENGTH,&(p[2]),
3073                                 (unsigned int *)&j,pkey->pkey.dsa))
3074                                 {
3075                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3076                                 goto err;
3077                                 }
3078                         s2n(j,p);
3079                         n=j+2;
3080                         }
3081                 else
3082 #endif
3083 #ifndef OPENSSL_NO_ECDSA
3084                         if (pkey->type == EVP_PKEY_EC)
3085                         {
3086                         if (!ECDSA_sign(pkey->save_type,
3087                                 &(data[MD5_DIGEST_LENGTH]),
3088                                 SHA_DIGEST_LENGTH,&(p[2]),
3089                                 (unsigned int *)&j,pkey->pkey.ec))
3090                                 {
3091                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3092                                     ERR_R_ECDSA_LIB);
3093                                 goto err;
3094                                 }
3095                         s2n(j,p);
3096                         n=j+2;
3097                         }
3098                 else
3099 #endif
3100                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3101                 {
3102                 unsigned char signbuf[64];
3103                 int i;
3104                 size_t sigsize=64;
3105                 s->method->ssl3_enc->cert_verify_mac(s,
3106                         NID_id_GostR3411_94,
3107                         data);
3108                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3109                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3110                         ERR_R_INTERNAL_ERROR);
3111                         goto err;
3112                 }
3113                 for (i=63,j=0; i>=0; j++, i--) {
3114                         p[2+j]=signbuf[i];
3115                 }
3116                 s2n(j,p);
3117                 n=j+2;
3118                 }
3119                 else
3120                 {
3121                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3122                         goto err;
3123                 }
3124                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3125                 l2n3(n,d);
3126
3127                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3128                 s->init_num=(int)n+4;
3129                 s->init_off=0;
3130                 }
3131         EVP_MD_CTX_cleanup(&mctx);
3132         EVP_PKEY_CTX_free(pctx);
3133         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3134 err:
3135         EVP_MD_CTX_cleanup(&mctx);
3136         EVP_PKEY_CTX_free(pctx);
3137         return(-1);
3138         }
3139
3140 /* Check a certificate can be used for client authentication. Currently
3141  * just check cert exists and if static DH client certificates can be used.
3142  */
3143 static int ssl3_check_client_certificate(SSL *s)
3144         {
3145         unsigned long alg_k;
3146         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3147                 return 0;
3148         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3149         /* See if we can use client certificate for fixed DH */
3150         if (alg_k & (SSL_kDHr|SSL_kDHd))
3151                 {
3152                 SESS_CERT *scert = s->session->sess_cert;
3153                 int i = scert->peer_cert_type;
3154                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3155                 clkey = s->cert->key->privatekey;
3156                 /* If client key not DH assume it can be used */
3157                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3158                         return 1;
3159                 if (i >= 0)
3160                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3161                 if (spkey)
3162                         {
3163                         /* Compare server and client parameters */
3164                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3165                         EVP_PKEY_free(spkey);
3166                         if (i != 1)
3167                                 return 0;
3168                         }
3169                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3170                 }
3171         return 1;
3172         }
3173
3174 int ssl3_send_client_certificate(SSL *s)
3175         {
3176         X509 *x509=NULL;
3177         EVP_PKEY *pkey=NULL;
3178         int i;
3179         unsigned long l;
3180
3181         if (s->state == SSL3_ST_CW_CERT_A)
3182                 {
3183                 if (ssl3_check_client_certificate(s))
3184                         s->state=SSL3_ST_CW_CERT_C;
3185                 else
3186                         s->state=SSL3_ST_CW_CERT_B;
3187                 }
3188
3189         /* We need to get a client cert */
3190         if (s->state == SSL3_ST_CW_CERT_B)
3191                 {
3192                 /* If we get an error, we need to
3193                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3194                  * We then get retied later */
3195                 i=0;
3196                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3197                 if (i < 0)
3198                         {
3199                         s->rwstate=SSL_X509_LOOKUP;
3200                         return(-1);
3201                         }
3202                 s->rwstate=SSL_NOTHING;
3203                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3204                         {
3205                         s->state=SSL3_ST_CW_CERT_B;
3206                         if (    !SSL_use_certificate(s,x509) ||
3207                                 !SSL_use_PrivateKey(s,pkey))
3208                                 i=0;
3209                         }
3210                 else if (i == 1)
3211                         {
3212                         i=0;
3213                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3214                         }
3215
3216                 if (x509 != NULL) X509_free(x509);
3217                 if (pkey != NULL) EVP_PKEY_free(pkey);
3218                 if (i && !ssl3_check_client_certificate(s))
3219                         i = 0;
3220                 if (i == 0)
3221                         {
3222                         if (s->version == SSL3_VERSION)
3223                                 {
3224                                 s->s3->tmp.cert_req=0;
3225                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3226                                 return(1);
3227                                 }
3228                         else
3229                                 {
3230                                 s->s3->tmp.cert_req=2;
3231                                 }
3232                         }
3233
3234                 /* Ok, we have a cert */
3235                 s->state=SSL3_ST_CW_CERT_C;
3236                 }
3237
3238         if (s->state == SSL3_ST_CW_CERT_C)
3239                 {
3240                 s->state=SSL3_ST_CW_CERT_D;
3241                 l=ssl3_output_cert_chain(s,
3242                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3243                 s->init_num=(int)l;
3244                 s->init_off=0;
3245                 }
3246         /* SSL3_ST_CW_CERT_D */
3247         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3248         }
3249
3250 #define has_bits(i,m)   (((i)&(m)) == (m))
3251
3252 int ssl3_check_cert_and_algorithm(SSL *s)
3253         {
3254         int i,idx;
3255         long alg_k,alg_a;
3256         EVP_PKEY *pkey=NULL;
3257         SESS_CERT *sc;
3258 #ifndef OPENSSL_NO_RSA
3259         RSA *rsa;
3260 #endif
3261 #ifndef OPENSSL_NO_DH
3262         DH *dh;
3263 #endif
3264
3265         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3266         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3267
3268         /* we don't have a certificate */
3269         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3270                 return(1);
3271
3272         sc=s->session->sess_cert;
3273         if (sc == NULL)
3274                 {
3275                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3276                 goto err;
3277                 }
3278
3279 #ifndef OPENSSL_NO_RSA
3280         rsa=s->session->sess_cert->peer_rsa_tmp;
3281 #endif
3282 #ifndef OPENSSL_NO_DH
3283         dh=s->session->sess_cert->peer_dh_tmp;
3284 #endif
3285
3286         /* This is the passed certificate */
3287
3288         idx=sc->peer_cert_type;
3289 #ifndef OPENSSL_NO_ECDH
3290         if (idx == SSL_PKEY_ECC)
3291                 {
3292                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3293                                                                 s) == 0)
3294                         { /* check failed */
3295                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3296                         goto f_err;
3297                         }
3298                 else
3299                         {
3300                         return 1;
3301                         }
3302                 }
3303 #endif
3304         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3305         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3306         EVP_PKEY_free(pkey);
3307
3308
3309         /* Check that we have a certificate if we require one */
3310         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3311                 {
3312                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3313                 goto f_err;
3314                 }
3315 #ifndef OPENSSL_NO_DSA
3316         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3317                 {
3318                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3319                 goto f_err;
3320                 }
3321 #endif
3322 #ifndef OPENSSL_NO_RSA
3323         if ((alg_k & SSL_kRSA) &&
3324                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3325                 {
3326                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3327                 goto f_err;
3328                 }
3329 #endif
3330 #ifndef OPENSSL_NO_DH
3331         if ((alg_k & SSL_kEDH) &&
3332                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3333                 {
3334                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3335                 goto f_err;
3336                 }
3337         else if ((alg_k & SSL_kDHr) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3338                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3339                 {
3340                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3341                 goto f_err;
3342                 }
3343 #ifndef OPENSSL_NO_DSA
3344         else if ((alg_k & SSL_kDHd) && (TLS1_get_version(s) < TLS1_2_VERSION) &&
3345                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3346                 {
3347                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3348                 goto f_err;
3349                 }
3350 #endif
3351 #endif
3352
3353         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3354                 {
3355 #ifndef OPENSSL_NO_RSA
3356                 if (alg_k & SSL_kRSA)
3357                         {
3358                         if (rsa == NULL
3359                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3360                                 {
3361                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3362                                 goto f_err;
3363                                 }
3364                         }
3365                 else
3366 #endif
3367 #ifndef OPENSSL_NO_DH
3368                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3369                             {
3370                             if (dh == NULL
3371                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3372                                 {
3373                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3374                                 goto f_err;
3375                                 }
3376                         }
3377                 else
3378 #endif
3379                         {
3380                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3381                         goto f_err;
3382                         }
3383                 }
3384         return(1);
3385 f_err:
3386         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3387 err:
3388         return(0);
3389         }
3390
3391 /* Check to see if handshake is full or resumed. Usually this is just a
3392  * case of checking to see if a cache hit has occurred. In the case of
3393  * session tickets we have to check the next message to be sure.
3394  */
3395
3396 #ifndef OPENSSL_NO_TLSEXT
3397 # ifndef OPENSSL_NO_NEXTPROTONEG
3398 int ssl3_send_next_proto(SSL *s)
3399         {
3400         unsigned int len, padding_len;
3401         unsigned char *d;
3402
3403         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3404                 {
3405                 len = s->next_proto_negotiated_len;
3406                 padding_len = 32 - ((len + 2) % 32);
3407                 d = (unsigned char *)s->init_buf->data;
3408                 d[4] = len;
3409                 memcpy(d + 5, s->next_proto_negotiated, len);
3410                 d[5 + len] = padding_len;
3411                 memset(d + 6 + len, 0, padding_len);
3412                 *(d++)=SSL3_MT_NEXT_PROTO;
3413                 l2n3(2 + len + padding_len, d);
3414                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3415                 s->init_num = 4 + 2 + len + padding_len;
3416                 s->init_off = 0;
3417                 }
3418
3419         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3420         }
3421 # endif
3422
3423 int ssl3_check_finished(SSL *s)
3424         {
3425         int ok;
3426         long n;
3427         /* If we have no ticket it cannot be a resumed session. */
3428         if (!s->session->tlsext_tick)
3429                 return 1;
3430         /* this function is called when we really expect a Certificate
3431          * message, so permit appropriate message length */
3432         n=s->method->ssl_get_message(s,
3433                 SSL3_ST_CR_CERT_A,
3434                 SSL3_ST_CR_CERT_B,
3435                 -1,
3436                 s->max_cert_list,
3437                 &ok);
3438         if (!ok) return((int)n);
3439         s->s3->tmp.reuse_message = 1;
3440         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3441                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3442                 return 2;
3443
3444         return 1;
3445         }
3446 #endif
3447
3448 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3449         {
3450         int i = 0;
3451 #ifndef OPENSSL_NO_ENGINE
3452         if (s->ctx->client_cert_engine)
3453                 {
3454                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3455                                                 SSL_get_client_CA_list(s),
3456                                                 px509, ppkey, NULL, NULL, NULL);
3457                 if (i != 0)
3458                         return i;
3459                 }
3460 #endif
3461         if (s->ctx->client_cert_cb)
3462                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3463         return i;
3464         }
3465
3466 #ifndef OPENSSL_NO_TLSEXT
3467 int tls1_get_server_supplemental_data(SSL *s)
3468         {
3469         int al;
3470         int ok;
3471         unsigned long supp_data_len, authz_data_len;
3472         long n;
3473         unsigned short supp_data_type, authz_data_type, proof_len;
3474         const unsigned char *p;
3475         unsigned char *new_proof;
3476
3477         n=s->method->ssl_get_message(s,
3478                 SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3479                 SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3480                 SSL3_MT_SUPPLEMENTAL_DATA,
3481                 /* use default limit */
3482                 TLSEXT_MAXLEN_supplemental_data,
3483                 &ok);
3484
3485         if (!ok) return((int)n);
3486
3487         p = (unsigned char *)s->init_msg;
3488
3489         /* The message cannot be empty */
3490         if (n < 3)
3491                 {
3492                 al = SSL_AD_DECODE_ERROR;
3493                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3494                 goto f_err;
3495                 }
3496         /* Length of supplemental data */
3497         n2l3(p,supp_data_len);
3498         n -= 3;
3499         /* We must have at least one supplemental data entry
3500          * with type (1 byte) and length (2 bytes). */
3501         if (supp_data_len != (unsigned long) n || n < 4)
3502                 {
3503                 al = SSL_AD_DECODE_ERROR;
3504                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3505                 goto f_err;
3506                 }
3507         /* Supplemental data type: must be authz_data */
3508         n2s(p,supp_data_type);
3509         n -= 2;
3510         if (supp_data_type != TLSEXT_SUPPLEMENTALDATATYPE_authz_data)
3511                 {
3512                 al = SSL_AD_UNEXPECTED_MESSAGE;
3513                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_SUPPLEMENTAL_DATA_TYPE);
3514                 goto f_err;
3515                 }
3516         /* Authz data length */
3517         n2s(p, authz_data_len);
3518         n -= 2;
3519         if (authz_data_len != (unsigned long) n || n < 1)
3520                 {
3521                 al = SSL_AD_DECODE_ERROR;
3522                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3523                 goto f_err;
3524                 }
3525         /* Authz data type: must be audit_proof */
3526         authz_data_type = *(p++);
3527         n -= 1;
3528         if (authz_data_type != TLSEXT_AUTHZDATAFORMAT_audit_proof)
3529                 {
3530                 al=SSL_AD_UNEXPECTED_MESSAGE;
3531                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_UNKNOWN_AUTHZ_DATA_TYPE);
3532                 goto f_err;
3533                 }
3534         /* We have a proof: read its length */
3535         if (n < 2)
3536                 {
3537                 al = SSL_AD_DECODE_ERROR;
3538                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3539                 goto f_err;
3540                 }
3541         n2s(p, proof_len);
3542         n -= 2;
3543         if (proof_len != (unsigned long) n)
3544                 {
3545                 al = SSL_AD_DECODE_ERROR;
3546                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3547                 goto f_err;
3548                 }
3549         /* Store the proof */
3550         new_proof = OPENSSL_realloc(s->session->audit_proof,
3551                                     proof_len);
3552         if (new_proof == NULL)
3553                 {
3554                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,ERR_R_MALLOC_FAILURE);
3555                 return 0;
3556                 }
3557         s->session->audit_proof_length = proof_len;
3558         s->session->audit_proof = new_proof;
3559         memcpy(s->session->audit_proof, p, proof_len);
3560
3561         /* Got the proof, but can't verify it yet. */
3562         return 1;
3563 f_err:
3564         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3565         return -1;
3566         }
3567 #endif