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 <openssl/crypto.h>
 153 #include "ssl_locl.h"
 154 #include "kssl_lcl.h"
 155 #include <openssl/buffer.h>
 156 #include <openssl/rand.h>
 157 #include <openssl/objects.h>
 158 #include <openssl/evp.h>
 159 #include <openssl/md5.h>
 160 #ifndef OPENSSL_NO_DH
 161 #include <openssl/dh.h>
 162 #endif
 163 #include <openssl/bn.h>
 164 #ifndef OPENSSL_NO_ENGINE
 165 #include <openssl/engine.h>
 166 #endif
 167
 168 static const SSL_METHOD *ssl3_get_client_method(int ver);
 169 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 170
 171 static const SSL_METHOD *ssl3_get_client_method(int ver)
 172         {
 173         if (ver == SSL3_VERSION)
 174                 return(SSLv3_client_method());
 175         else
 176                 return(NULL);
 177         }
 178
 179 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 180                         ssl_undefined_function,
 181                         ssl3_connect,
 182                         ssl3_get_client_method)
 183
 184 int ssl3_connect(SSL *s)
 185         {
 186         BUF_MEM *buf=NULL;
 187         unsigned long Time=(unsigned long)time(NULL);
 188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 189         int ret= -1;
 190         int new_state,state,skip=0;
 191
 192         RAND_add(&Time,sizeof(Time),0);
 193         ERR_clear_error();
 194         clear_sys_error();
 195
 196         if (s->info_callback != NULL)
 197                 cb=s->info_callback;
 198         else if (s->ctx->info_callback != NULL)
 199                 cb=s->ctx->info_callback;
 200
 201         s->in_handshake++;
 202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 203
 204         for (;;)
 205                 {
 206                 state=s->state;
 207
 208                 switch(s->state)
 209                         {
 210                 case SSL_ST_RENEGOTIATE:
 211                         s->renegotiate=1;
 212                         s->state=SSL_ST_CONNECT;
 213                         s->ctx->stats.sess_connect_renegotiate++;
 214                         /* break */
 215                 case SSL_ST_BEFORE:
 216                 case SSL_ST_CONNECT:
 217                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 218                 case SSL_ST_OK|SSL_ST_CONNECT:
 219
 220                         s->server=0;
 221                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 222
 223                         if ((s->version & 0xff00 ) != 0x0300)
 224                                 {
 225                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 226                                 ret = -1;
 227                                 goto end;
 228                                 }
 229
 230                         /* s->version=SSL3_VERSION; */
 231                         s->type=SSL_ST_CONNECT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 buf=NULL;
 247                                 }
 248
 249                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 250
 251                         /* setup buffing BIO */
 252                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 253
 254                         /* don't push the buffering BIO quite yet */
 255
 256                         ssl3_init_finished_mac(s);
 257
 258                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 259                         s->ctx->stats.sess_connect++;
 260                         s->init_num=0;
 261                         break;
 262
 263                 case SSL3_ST_CW_CLNT_HELLO_A:
 264                 case SSL3_ST_CW_CLNT_HELLO_B:
 265
 266                         s->shutdown=0;
 267                         ret=ssl3_client_hello(s);
 268                         if (ret <= 0) goto end;
 269                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 270                         s->init_num=0;
 271
 272                         /* turn on buffering for the next lot of output */
 273                         if (s->bbio != s->wbio)
 274                                 s->wbio=BIO_push(s->bbio,s->wbio);
 275
 276                         break;
 277
 278                 case SSL3_ST_CR_SRVR_HELLO_A:
 279                 case SSL3_ST_CR_SRVR_HELLO_B:
 280                         ret=ssl3_get_server_hello(s);
 281 #ifndef OPENSSL_NO_SRP
 282                         if ((ret == 0) && (s->s3->warn_alert == SSL_AD_MISSING_SRP_USERNAME))
 283                                 {
 284                                 if (!SRP_have_to_put_srp_username(s))
 285                                         {
 286                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_MISSING_SRP_USERNAME);
 287                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_USER_CANCELLED);
 288                                         goto end;
 289                                         }
 290                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
 291                                 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 292                                 break;
 293                                 }
 294 #endif
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 s->state=SSL3_ST_CR_FINISHED_A;
 299                         else
 300                                 s->state=SSL3_ST_CR_CERT_A;
 301                         s->init_num=0;
 302                         break;
 303
 304                 case SSL3_ST_CR_CERT_A:
 305                 case SSL3_ST_CR_CERT_B:
 306 #ifndef OPENSSL_NO_TLSEXT
 307                         ret=ssl3_check_finished(s);
 308                         if (ret <= 0) goto end;
 309                         if (ret == 2)
 310                                 {
 311                                 s->hit = 1;
 312                                 if (s->tlsext_ticket_expected)
 313                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 314                                 else
 315                                         s->state=SSL3_ST_CR_FINISHED_A;
 316                                 s->init_num=0;
 317                                 break;
 318                                 }
 319 #endif
 320                         /* Check if it is anon DH/ECDH */
 321                         /* or PSK */
 322                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 323                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 324                                 {
 325                                 ret=ssl3_get_server_certificate(s);
 326                                 if (ret <= 0) goto end;
 327 #ifndef OPENSSL_NO_TLSEXT
 328                                 if (s->tlsext_status_expected)
 329                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 330                                 else
 331                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 332                                 }
 333                         else
 334                                 {
 335                                 skip = 1;
 336                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 337                                 }
 338 #else
 339                                 }
 340                         else
 341                                 skip=1;
 342
 343                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 344 #endif
 345                         s->init_num=0;
 346                         break;
 347
 348                 case SSL3_ST_CR_KEY_EXCH_A:
 349                 case SSL3_ST_CR_KEY_EXCH_B:
 350                         ret=ssl3_get_key_exchange(s);
 351                         if (ret <= 0) goto end;
 352                         s->state=SSL3_ST_CR_CERT_REQ_A;
 353                         s->init_num=0;
 354
 355                         /* at this point we check that we have the
 356                          * required stuff from the server */
 357                         if (!ssl3_check_cert_and_algorithm(s))
 358                                 {
 359                                 ret= -1;
 360                                 goto end;
 361                                 }
 362                         break;
 363
 364                 case SSL3_ST_CR_CERT_REQ_A:
 365                 case SSL3_ST_CR_CERT_REQ_B:
 366                         ret=ssl3_get_certificate_request(s);
 367                         if (ret <= 0) goto end;
 368                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 369                         s->init_num=0;
 370                         break;
 371
 372                 case SSL3_ST_CR_SRVR_DONE_A:
 373                 case SSL3_ST_CR_SRVR_DONE_B:
 374                         ret=ssl3_get_server_done(s);
 375                         if (ret <= 0) goto end;
 376 #ifndef OPENSSL_NO_SRP
 377                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 378                                 {
 379                                 if ((ret = SRP_Calc_A_param(s))<=0)
 380                                         {
 381                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 382                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 383                                         goto end;
 384                                         }
 385                                 }
 386 #endif
 387                         if (s->s3->tmp.cert_req)
 388                                 s->state=SSL3_ST_CW_CERT_A;
 389                         else
 390                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 391                         s->init_num=0;
 392
 393                         break;
 394
 395                 case SSL3_ST_CW_CERT_A:
 396                 case SSL3_ST_CW_CERT_B:
 397                 case SSL3_ST_CW_CERT_C:
 398                 case SSL3_ST_CW_CERT_D:
 399                         ret=ssl3_send_client_certificate(s);
 400                         if (ret <= 0) goto end;
 401                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 402                         s->init_num=0;
 403                         break;
 404
 405                 case SSL3_ST_CW_KEY_EXCH_A:
 406                 case SSL3_ST_CW_KEY_EXCH_B:
 407                         ret=ssl3_send_client_key_exchange(s);
 408                         if (ret <= 0) goto end;
 409                         /* EAY EAY EAY need to check for DH fix cert
 410                          * sent back */
 411                         /* For TLS, cert_req is set to 2, so a cert chain
 412                          * of nothing is sent, but no verify packet is sent */
 413                         /* XXX: For now, we do not support client
 414                          * authentication in ECDH cipher suites with
 415                          * ECDH (rather than ECDSA) certificates.
 416                          * We need to skip the certificate verify
 417                          * message when client's ECDH public key is sent
 418                          * inside the client certificate.
 419                          */
 420                         if (s->s3->tmp.cert_req == 1)
 421                                 {
 422                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 423                                 }
 424                         else
 425                                 {
 426                                 s->state=SSL3_ST_CW_CHANGE_A;
 427                                 s->s3->change_cipher_spec=0;
 428                                 }
 429                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 430                                 {
 431                                 s->state=SSL3_ST_CW_CHANGE_A;
 432                                 s->s3->change_cipher_spec=0;
 433                                 }
 434
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_CW_CERT_VRFY_A:
 439                 case SSL3_ST_CW_CERT_VRFY_B:
 440                         ret=ssl3_send_client_verify(s);
 441                         if (ret <= 0) goto end;
 442                         s->state=SSL3_ST_CW_CHANGE_A;
 443                         s->init_num=0;
 444                         s->s3->change_cipher_spec=0;
 445                         break;
 446
 447                 case SSL3_ST_CW_CHANGE_A:
 448                 case SSL3_ST_CW_CHANGE_B:
 449                         ret=ssl3_send_change_cipher_spec(s,
 450                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 451                         if (ret <= 0) goto end;
 452
 453 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 454                         s->state=SSL3_ST_CW_FINISHED_A;
 455 #else
 456                         if (s->next_proto_negotiated)
 457                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 458                         else
 459                                 s->state=SSL3_ST_CW_FINISHED_A;
 460 #endif
 461                         s->init_num=0;
 462
 463                         s->session->cipher=s->s3->tmp.new_cipher;
 464 #ifdef OPENSSL_NO_COMP
 465                         s->session->compress_meth=0;
 466 #else
 467                         if (s->s3->tmp.new_compression == NULL)
 468                                 s->session->compress_meth=0;
 469                         else
 470                                 s->session->compress_meth=
 471                                         s->s3->tmp.new_compression->id;
 472 #endif
 473                         if (!s->method->ssl3_enc->setup_key_block(s))
 474                                 {
 475                                 ret= -1;
 476                                 goto end;
 477                                 }
 478
 479                         if (!s->method->ssl3_enc->change_cipher_state(s,
 480                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 481                                 {
 482                                 ret= -1;
 483                                 goto end;
 484                                 }
 485
 486                         break;
 487
 488 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 489                 case SSL3_ST_CW_NEXT_PROTO_A:
 490                 case SSL3_ST_CW_NEXT_PROTO_B:
 491                         ret=ssl3_send_next_proto(s);
 492                         if (ret <= 0) goto end;
 493                         s->state=SSL3_ST_CW_FINISHED_A;
 494                         break;
 495 #endif
 496
 497                 case SSL3_ST_CW_FINISHED_A:
 498                 case SSL3_ST_CW_FINISHED_B:
 499                         ret=ssl3_send_finished(s,
 500                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 501                                 s->method->ssl3_enc->client_finished_label,
 502                                 s->method->ssl3_enc->client_finished_label_len);
 503                         if (ret <= 0) goto end;
 504                         s->state=SSL3_ST_CW_FLUSH;
 505
 506                         /* clear flags */
 507                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 508                         if (s->hit)
 509                                 {
 510                                 s->s3->tmp.next_state=SSL_ST_OK;
 511                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 512                                         {
 513                                         s->state=SSL_ST_OK;
 514                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 515                                         s->s3->delay_buf_pop_ret=0;
 516                                         }
 517                                 }
 518                         else
 519                                 {
 520 #ifndef OPENSSL_NO_TLSEXT
 521                                 /* Allow NewSessionTicket if ticket expected */
 522                                 if (s->tlsext_ticket_expected)
 523                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 524                                 else
 525 #endif
 526
 527                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 528                                 }
 529                         s->init_num=0;
 530                         break;
 531
 532 #ifndef OPENSSL_NO_TLSEXT
 533                 case SSL3_ST_CR_SESSION_TICKET_A:
 534                 case SSL3_ST_CR_SESSION_TICKET_B:
 535                         ret=ssl3_get_new_session_ticket(s);
 536                         if (ret <= 0) goto end;
 537                         s->state=SSL3_ST_CR_FINISHED_A;
 538                         s->init_num=0;
 539                 break;
 540
 541                 case SSL3_ST_CR_CERT_STATUS_A:
 542                 case SSL3_ST_CR_CERT_STATUS_B:
 543                         ret=ssl3_get_cert_status(s);
 544                         if (ret <= 0) goto end;
 545                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 546                         s->init_num=0;
 547                 break;
 548 #endif
 549
 550                 case SSL3_ST_CR_FINISHED_A:
 551                 case SSL3_ST_CR_FINISHED_B:
 552
 553                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 554                                 SSL3_ST_CR_FINISHED_B);
 555                         if (ret <= 0) goto end;
 556
 557                         if (s->hit)
 558                                 s->state=SSL3_ST_CW_CHANGE_A;
 559                         else
 560                                 s->state=SSL_ST_OK;
 561                         s->init_num=0;
 562                         break;
 563
 564                 case SSL3_ST_CW_FLUSH:
 565                         s->rwstate=SSL_WRITING;
 566                         if (BIO_flush(s->wbio) <= 0)
 567                                 {
 568                                 ret= -1;
 569                                 goto end;
 570                                 }
 571                         s->rwstate=SSL_NOTHING;
 572                         s->state=s->s3->tmp.next_state;
 573                         break;
 574
 575                 case SSL_ST_OK:
 576                         /* clean a few things up */
 577                         ssl3_cleanup_key_block(s);
 578
 579                         if (s->init_buf != NULL)
 580                                 {
 581                                 BUF_MEM_free(s->init_buf);
 582                                 s->init_buf=NULL;
 583                                 }
 584
 585                         /* If we are not 'joining' the last two packets,
 586                          * remove the buffering now */
 587                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 588                                 ssl_free_wbio_buffer(s);
 589                         /* else do it later in ssl3_write */
 590
 591                         s->init_num=0;
 592                         s->renegotiate=0;
 593                         s->new_session=0;
 594
 595                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 596                         if (s->hit) s->ctx->stats.sess_hit++;
 597
 598                         ret=1;
 599                         /* s->server=0; */
 600                         s->handshake_func=ssl3_connect;
 601                         s->ctx->stats.sess_connect_good++;
 602
 603                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 604
 605                         goto end;
 606                         /* break; */
 607
 608                 default:
 609                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 610                         ret= -1;
 611                         goto end;
 612                         /* break; */
 613                         }
 614
 615                 /* did we do anything */
 616                 if (!s->s3->tmp.reuse_message && !skip)
 617                         {
 618                         if (s->debug)
 619                                 {
 620                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 621                                         goto end;
 622                                 }
 623
 624                         if ((cb != NULL) && (s->state != state))
 625                                 {
 626                                 new_state=s->state;
 627                                 s->state=state;
 628                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 629                                 s->state=new_state;
 630                                 }
 631                         }
 632                 skip=0;
 633                 }
 634 end:
 635         s->in_handshake--;
 636         if (buf != NULL)
 637                 BUF_MEM_free(buf);
 638         if (cb != NULL)
 639                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 640         return(ret);
 641         }
 642
 643
 644 int ssl3_client_hello(SSL *s)
 645         {
 646         unsigned char *buf;
 647         unsigned char *p,*d;
 648         int i;
 649         unsigned long Time,l;
 650 #ifndef OPENSSL_NO_COMP
 651         int j;
 652         SSL_COMP *comp;
 653 #endif
 654
 655         buf=(unsigned char *)s->init_buf->data;
 656         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 657                 {
 658                 SSL_SESSION *sess = s->session;
 659                 if ((sess == NULL) ||
 660                         (sess->ssl_version != s->version) ||
 661 #ifdef OPENSSL_NO_TLSEXT
 662                         !sess->session_id_length ||
 663 #else
 664                         (!sess->session_id_length && !sess->tlsext_tick) ||
 665 #endif
 666                         (sess->not_resumable))
 667                         {
 668                         if (!ssl_get_new_session(s,0))
 669                                 goto err;
 670                         }
 671                 /* else use the pre-loaded session */
 672
 673                 p=s->s3->client_random;
 674                 Time=(unsigned long)time(NULL);                 /* Time */
 675                 l2n(Time,p);
 676                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 677                         goto err;
 678
 679                 /* Do the message type and length last */
 680                 d=p= &(buf[4]);
 681
 682                 *(p++)=s->version>>8;
 683                 *(p++)=s->version&0xff;
 684                 s->client_version=s->version;
 685
 686                 /* Random stuff */
 687                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 688                 p+=SSL3_RANDOM_SIZE;
 689
 690                 /* Session ID */
 691                 if (s->new_session)
 692                         i=0;
 693                 else
 694                         i=s->session->session_id_length;
 695                 *(p++)=i;
 696                 if (i != 0)
 697                         {
 698                         if (i > (int)sizeof(s->session->session_id))
 699                                 {
 700                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 701                                 goto err;
 702                                 }
 703                         memcpy(p,s->session->session_id,i);
 704                         p+=i;
 705                         }
 706
 707                 /* Ciphers supported */
 708                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 709                 if (i == 0)
 710                         {
 711                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 712                         goto err;
 713                         }
 714                 s2n(i,p);
 715                 p+=i;
 716
 717                 /* COMPRESSION */
 718 #ifdef OPENSSL_NO_COMP
 719                 *(p++)=1;
 720 #else
 721
 722                 if ((s->options & SSL_OP_NO_COMPRESSION)
 723                                         || !s->ctx->comp_methods)
 724                         j=0;
 725                 else
 726                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 727                 *(p++)=1+j;
 728                 for (i=0; i<j; i++)
 729                         {
 730                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 731                         *(p++)=comp->id;
 732                         }
 733 #endif
 734                 *(p++)=0; /* Add the NULL method */
 735
 736 #ifndef OPENSSL_NO_TLSEXT
 737                 /* TLS extensions*/
 738                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 739                         {
 740                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 741                         goto err;
 742                         }
 743                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 744                         {
 745                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 746                         goto err;
 747                         }
 748 #endif
 749
 750                 l=(p-d);
 751                 d=buf;
 752                 *(d++)=SSL3_MT_CLIENT_HELLO;
 753                 l2n3(l,d);
 754
 755                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 756                 /* number of bytes to write */
 757                 s->init_num=p-buf;
 758                 s->init_off=0;
 759                 }
 760
 761         /* SSL3_ST_CW_CLNT_HELLO_B */
 762         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 763 err:
 764         return(-1);
 765         }
 766
 767 int ssl3_get_server_hello(SSL *s)
 768         {
 769         STACK_OF(SSL_CIPHER) *sk;
 770         const SSL_CIPHER *c;
 771         unsigned char *p,*d;
 772         int i,al,ok;
 773         unsigned int j;
 774         long n;
 775 #ifndef OPENSSL_NO_COMP
 776         SSL_COMP *comp;
 777 #endif
 778
 779         n=s->method->ssl_get_message(s,
 780                 SSL3_ST_CR_SRVR_HELLO_A,
 781                 SSL3_ST_CR_SRVR_HELLO_B,
 782                 -1,
 783                 20000, /* ?? */
 784                 &ok);
 785
 786         if (!ok) return((int)n);
 787
 788         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 789                 {
 790                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 791                         {
 792                         if ( s->d1->send_cookie == 0)
 793                                 {
 794                                 s->s3->tmp.reuse_message = 1;
 795                                 return 1;
 796                                 }
 797                         else /* already sent a cookie */
 798                                 {
 799                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 800                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 801                                 goto f_err;
 802                                 }
 803                         }
 804                 }
 805
 806         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 807                 {
 808                 al=SSL_AD_UNEXPECTED_MESSAGE;
 809                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 810                 goto f_err;
 811                 }
 812
 813         d=p=(unsigned char *)s->init_msg;
 814
 815         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 816                 {
 817                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 818                 s->version=(s->version&0xff00)|p[1];
 819                 al=SSL_AD_PROTOCOL_VERSION;
 820                 goto f_err;
 821                 }
 822         p+=2;
 823
 824         /* load the server hello data */
 825         /* load the server random */
 826         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 827         p+=SSL3_RANDOM_SIZE;
 828
 829         /* get the session-id */
 830         j= *(p++);
 831
 832         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 833                 {
 834                 al=SSL_AD_ILLEGAL_PARAMETER;
 835                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 836                 goto f_err;
 837                 }
 838
 839 #ifndef OPENSSL_NO_TLSEXT
 840         /* check if we want to resume the session based on external pre-shared secret */
 841         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 842                 {
 843                 SSL_CIPHER *pref_cipher=NULL;
 844                 s->session->master_key_length=sizeof(s->session->master_key);
 845                 if (s->tls_session_secret_cb(s, s->session->master_key,
 846                                              &s->session->master_key_length,
 847                                              NULL, &pref_cipher,
 848                                              s->tls_session_secret_cb_arg))
 849                         {
 850                         s->session->cipher = pref_cipher ?
 851                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 852                         }
 853                 }
 854 #endif /* OPENSSL_NO_TLSEXT */
 855
 856         if (j != 0 && j == s->session->session_id_length
 857             && memcmp(p,s->session->session_id,j) == 0)
 858             {
 859             if(s->sid_ctx_length != s->session->sid_ctx_length
 860                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 861                 {
 862                 /* actually a client application bug */
 863                 al=SSL_AD_ILLEGAL_PARAMETER;
 864                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 865                 goto f_err;
 866                 }
 867             s->hit=1;
 868             }
 869         else    /* a miss or crap from the other end */
 870                 {
 871                 /* If we were trying for session-id reuse, make a new
 872                  * SSL_SESSION so we don't stuff up other people */
 873                 s->hit=0;
 874                 if (s->session->session_id_length > 0)
 875                         {
 876                         if (!ssl_get_new_session(s,0))
 877                                 {
 878                                 al=SSL_AD_INTERNAL_ERROR;
 879                                 goto f_err;
 880                                 }
 881                         }
 882                 s->session->session_id_length=j;
 883                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 884                 }
 885         p+=j;
 886         c=ssl_get_cipher_by_char(s,p);
 887         if (c == NULL)
 888                 {
 889                 /* unknown cipher */
 890                 al=SSL_AD_ILLEGAL_PARAMETER;
 891                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 892                 goto f_err;
 893                 }
 894         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 895
 896         sk=ssl_get_ciphers_by_id(s);
 897         i=sk_SSL_CIPHER_find(sk,c);
 898         if (i < 0)
 899                 {
 900                 /* we did not say we would use this cipher */
 901                 al=SSL_AD_ILLEGAL_PARAMETER;
 902                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 903                 goto f_err;
 904                 }
 905
 906         /* Depending on the session caching (internal/external), the cipher
 907            and/or cipher_id values may not be set. Make sure that
 908            cipher_id is set and use it for comparison. */
 909         if (s->session->cipher)
 910                 s->session->cipher_id = s->session->cipher->id;
 911         if (s->hit && (s->session->cipher_id != c->id))
 912                 {
 913 /* Workaround is now obsolete */
 914 #if 0
 915                 if (!(s->options &
 916                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 917 #endif
 918                         {
 919                         al=SSL_AD_ILLEGAL_PARAMETER;
 920                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 921                         goto f_err;
 922                         }
 923                 }
 924         s->s3->tmp.new_cipher=c;
 925         /* Don't digest cached records if TLS v1.2: we may need them for
 926          * client authentication.
 927          */
 928         if (s->version < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
 929                 goto f_err;
 930         /* lets get the compression algorithm */
 931         /* COMPRESSION */
 932 #ifdef OPENSSL_NO_COMP
 933         if (*(p++) != 0)
 934                 {
 935                 al=SSL_AD_ILLEGAL_PARAMETER;
 936                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 937                 goto f_err;
 938                 }
 939         /* If compression is disabled we'd better not try to resume a session
 940          * using compression.
 941          */
 942         if (s->session->compress_meth != 0)
 943                 {
 944                 al=SSL_AD_INTERNAL_ERROR;
 945                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
 946                 goto f_err;
 947                 }
 948 #else
 949         j= *(p++);
 950         if (s->hit && j != s->session->compress_meth)
 951                 {
 952                 al=SSL_AD_ILLEGAL_PARAMETER;
 953                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
 954                 goto f_err;
 955                 }
 956         if (j == 0)
 957                 comp=NULL;
 958         else if (s->options & SSL_OP_NO_COMPRESSION)
 959                 {
 960                 al=SSL_AD_ILLEGAL_PARAMETER;
 961                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
 962                 goto f_err;
 963                 }
 964         else
 965                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 966
 967         if ((j != 0) && (comp == NULL))
 968                 {
 969                 al=SSL_AD_ILLEGAL_PARAMETER;
 970                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 971                 goto f_err;
 972                 }
 973         else
 974                 {
 975                 s->s3->tmp.new_compression=comp;
 976                 }
 977 #endif
 978
 979 #ifndef OPENSSL_NO_TLSEXT
 980         /* TLS extensions*/
 981         if (s->version >= SSL3_VERSION)
 982                 {
 983                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 984                         {
 985                         /* 'al' set by ssl_parse_serverhello_tlsext */
 986                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 987                         goto f_err;
 988                         }
 989                 if (ssl_check_serverhello_tlsext(s) <= 0)
 990                         {
 991                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 992                                 goto err;
 993                         }
 994                 }
 995 #endif
 996
 997         if (p != (d+n))
 998                 {
 999                 /* wrong packet length */
1000                 al=SSL_AD_DECODE_ERROR;
1001                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1002                 goto err;
1003                 }
1004
1005         return(1);
1006 f_err:
1007         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1008 err:
1009         return(-1);
1010         }
1011
1012 int ssl3_get_server_certificate(SSL *s)
1013         {
1014         int al,i,ok,ret= -1;
1015         unsigned long n,nc,llen,l;
1016         X509 *x=NULL;
1017         const unsigned char *q,*p;
1018         unsigned char *d;
1019         STACK_OF(X509) *sk=NULL;
1020         SESS_CERT *sc;
1021         EVP_PKEY *pkey=NULL;
1022         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1023
1024         n=s->method->ssl_get_message(s,
1025                 SSL3_ST_CR_CERT_A,
1026                 SSL3_ST_CR_CERT_B,
1027                 -1,
1028                 s->max_cert_list,
1029                 &ok);
1030
1031         if (!ok) return((int)n);
1032
1033         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1034                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1035                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1036                 {
1037                 s->s3->tmp.reuse_message=1;
1038                 return(1);
1039                 }
1040
1041         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1042                 {
1043                 al=SSL_AD_UNEXPECTED_MESSAGE;
1044                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1045                 goto f_err;
1046                 }
1047         p=d=(unsigned char *)s->init_msg;
1048
1049         if ((sk=sk_X509_new_null()) == NULL)
1050                 {
1051                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1052                 goto err;
1053                 }
1054
1055         n2l3(p,llen);
1056         if (llen+3 != n)
1057                 {
1058                 al=SSL_AD_DECODE_ERROR;
1059                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1060                 goto f_err;
1061                 }
1062         for (nc=0; nc<llen; )
1063                 {
1064                 n2l3(p,l);
1065                 if ((l+nc+3) > llen)
1066                         {
1067                         al=SSL_AD_DECODE_ERROR;
1068                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1069                         goto f_err;
1070                         }
1071
1072                 q=p;
1073                 x=d2i_X509(NULL,&q,l);
1074                 if (x == NULL)
1075                         {
1076                         al=SSL_AD_BAD_CERTIFICATE;
1077                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1078                         goto f_err;
1079                         }
1080                 if (q != (p+l))
1081                         {
1082                         al=SSL_AD_DECODE_ERROR;
1083                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1084                         goto f_err;
1085                         }
1086                 if (!sk_X509_push(sk,x))
1087                         {
1088                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1089                         goto err;
1090                         }
1091                 x=NULL;
1092                 nc+=l+3;
1093                 p=q;
1094                 }
1095
1096         i=ssl_verify_cert_chain(s,sk);
1097         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1098 #ifndef OPENSSL_NO_KRB5
1099             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1100                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1101 #endif /* OPENSSL_NO_KRB5 */
1102                 )
1103                 {
1104                 al=ssl_verify_alarm_type(s->verify_result);
1105                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1106                 goto f_err;
1107                 }
1108         ERR_clear_error(); /* but we keep s->verify_result */
1109
1110         sc=ssl_sess_cert_new();
1111         if (sc == NULL) goto err;
1112
1113         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1114         s->session->sess_cert=sc;
1115
1116         sc->cert_chain=sk;
1117         /* Inconsistency alert: cert_chain does include the peer's
1118          * certificate, which we don't include in s3_srvr.c */
1119         x=sk_X509_value(sk,0);
1120         sk=NULL;
1121         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1122
1123         pkey=X509_get_pubkey(x);
1124
1125         /* VRS: allow null cert if auth == KRB5 */
1126         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1127                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1128                     ? 0 : 1;
1129
1130 #ifdef KSSL_DEBUG
1131         printf("pkey,x = %p, %p\n", pkey,x);
1132         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1133         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1134                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1135 #endif    /* KSSL_DEBUG */
1136
1137         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1138                 {
1139                 x=NULL;
1140                 al=SSL3_AL_FATAL;
1141                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1142                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1143                 goto f_err;
1144                 }
1145
1146         i=ssl_cert_type(x,pkey);
1147         if (need_cert && i < 0)
1148                 {
1149                 x=NULL;
1150                 al=SSL3_AL_FATAL;
1151                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1152                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1153                 goto f_err;
1154                 }
1155
1156         if (need_cert)
1157                 {
1158                 sc->peer_cert_type=i;
1159                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1160                 /* Why would the following ever happen?
1161                  * We just created sc a couple of lines ago. */
1162                 if (sc->peer_pkeys[i].x509 != NULL)
1163                         X509_free(sc->peer_pkeys[i].x509);
1164                 sc->peer_pkeys[i].x509=x;
1165                 sc->peer_key= &(sc->peer_pkeys[i]);
1166
1167                 if (s->session->peer != NULL)
1168                         X509_free(s->session->peer);
1169                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1170                 s->session->peer=x;
1171                 }
1172         else
1173                 {
1174                 sc->peer_cert_type=i;
1175                 sc->peer_key= NULL;
1176
1177                 if (s->session->peer != NULL)
1178                         X509_free(s->session->peer);
1179                 s->session->peer=NULL;
1180                 }
1181         s->session->verify_result = s->verify_result;
1182
1183         x=NULL;
1184         ret=1;
1185
1186         if (0)
1187                 {
1188 f_err:
1189                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1190                 }
1191 err:
1192         EVP_PKEY_free(pkey);
1193         X509_free(x);
1194         sk_X509_pop_free(sk,X509_free);
1195         return(ret);
1196         }
1197
1198 int ssl3_get_key_exchange(SSL *s)
1199         {
1200 #ifndef OPENSSL_NO_RSA
1201         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1202 #endif
1203         EVP_MD_CTX md_ctx;
1204         unsigned char *param,*p;
1205         int al,i,j,param_len,ok;
1206         long n,alg_k,alg_a;
1207         EVP_PKEY *pkey=NULL;
1208         const EVP_MD *md = NULL;
1209 #ifndef OPENSSL_NO_RSA
1210         RSA *rsa=NULL;
1211 #endif
1212 #ifndef OPENSSL_NO_DH
1213         DH *dh=NULL;
1214 #endif
1215 #ifndef OPENSSL_NO_ECDH
1216         EC_KEY *ecdh = NULL;
1217         BN_CTX *bn_ctx = NULL;
1218         EC_POINT *srvr_ecpoint = NULL;
1219         int curve_nid = 0;
1220         int encoded_pt_len = 0;
1221 #endif
1222
1223         /* use same message size as in ssl3_get_certificate_request()
1224          * as ServerKeyExchange message may be skipped */
1225         n=s->method->ssl_get_message(s,
1226                 SSL3_ST_CR_KEY_EXCH_A,
1227                 SSL3_ST_CR_KEY_EXCH_B,
1228                 -1,
1229                 s->max_cert_list,
1230                 &ok);
1231         if (!ok) return((int)n);
1232
1233         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1234                 {
1235 #ifndef OPENSSL_NO_PSK
1236                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1237                    omitted if no identity hint is sent. Set
1238                    session->sess_cert anyway to avoid problems
1239                    later.*/
1240                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1241                         {
1242                         s->session->sess_cert=ssl_sess_cert_new();
1243                         if (s->ctx->psk_identity_hint)
1244                                 OPENSSL_free(s->ctx->psk_identity_hint);
1245                         s->ctx->psk_identity_hint = NULL;
1246                         }
1247 #endif
1248                 s->s3->tmp.reuse_message=1;
1249                 return(1);
1250                 }
1251
1252         param=p=(unsigned char *)s->init_msg;
1253         if (s->session->sess_cert != NULL)
1254                 {
1255 #ifndef OPENSSL_NO_RSA
1256                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1257                         {
1258                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1259                         s->session->sess_cert->peer_rsa_tmp=NULL;
1260                         }
1261 #endif
1262 #ifndef OPENSSL_NO_DH
1263                 if (s->session->sess_cert->peer_dh_tmp)
1264                         {
1265                         DH_free(s->session->sess_cert->peer_dh_tmp);
1266                         s->session->sess_cert->peer_dh_tmp=NULL;
1267                         }
1268 #endif
1269 #ifndef OPENSSL_NO_ECDH
1270                 if (s->session->sess_cert->peer_ecdh_tmp)
1271                         {
1272                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1273                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1274                         }
1275 #endif
1276                 }
1277         else
1278                 {
1279                 s->session->sess_cert=ssl_sess_cert_new();
1280                 }
1281
1282         param_len=0;
1283         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1284         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1285         EVP_MD_CTX_init(&md_ctx);
1286
1287 #ifndef OPENSSL_NO_PSK
1288         if (alg_k & SSL_kPSK)
1289                 {
1290                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1291
1292                 al=SSL_AD_HANDSHAKE_FAILURE;
1293                 n2s(p,i);
1294                 param_len=i+2;
1295                 /* Store PSK identity hint for later use, hint is used
1296                  * in ssl3_send_client_key_exchange.  Assume that the
1297                  * maximum length of a PSK identity hint can be as
1298                  * long as the maximum length of a PSK identity. */
1299                 if (i > PSK_MAX_IDENTITY_LEN)
1300                         {
1301                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1302                                 SSL_R_DATA_LENGTH_TOO_LONG);
1303                         goto f_err;
1304                         }
1305                 if (param_len > n)
1306                         {
1307                         al=SSL_AD_DECODE_ERROR;
1308                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1309                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1310                         goto f_err;
1311                         }
1312                 /* If received PSK identity hint contains NULL
1313                  * characters, the hint is truncated from the first
1314                  * NULL. p may not be ending with NULL, so create a
1315                  * NULL-terminated string. */
1316                 memcpy(tmp_id_hint, p, i);
1317                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1318                 if (s->ctx->psk_identity_hint != NULL)
1319                         OPENSSL_free(s->ctx->psk_identity_hint);
1320                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1321                 if (s->ctx->psk_identity_hint == NULL)
1322                         {
1323                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1324                         goto f_err;
1325                         }
1326
1327                 p+=i;
1328                 n-=param_len;
1329                 }
1330         else
1331 #endif /* !OPENSSL_NO_PSK */
1332 #ifndef OPENSSL_NO_SRP
1333         if (alg_k & SSL_kSRP)
1334                 {
1335                 n2s(p,i);
1336                 param_len=i+2;
1337                 if (param_len > n)
1338                         {
1339                         al=SSL_AD_DECODE_ERROR;
1340                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1341                         goto f_err;
1342                         }
1343                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1344                         {
1345                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1346                         goto err;
1347                         }
1348                 p+=i;
1349
1350                 n2s(p,i);
1351                 param_len+=i+2;
1352                 if (param_len > n)
1353                         {
1354                         al=SSL_AD_DECODE_ERROR;
1355                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1356                         goto f_err;
1357                         }
1358                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1359                         {
1360                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1361                         goto err;
1362                         }
1363                 p+=i;
1364
1365                 i = (unsigned int)(p[0]);
1366                 p++;
1367                 param_len+=i+1;
1368                 if (param_len > n)
1369                         {
1370                         al=SSL_AD_DECODE_ERROR;
1371                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1372                         goto f_err;
1373                         }
1374                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1375                         {
1376                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1377                         goto err;
1378                         }
1379                 p+=i;
1380
1381                 n2s(p,i);
1382                 param_len+=i+2;
1383                 if (param_len > n)
1384                         {
1385                         al=SSL_AD_DECODE_ERROR;
1386                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1387                         goto f_err;
1388                         }
1389                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1390                         {
1391                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1392                         goto err;
1393                         }
1394                 p+=i;
1395                 n-=param_len;
1396
1397 /* We must check if there is a certificate */
1398 #ifndef OPENSSL_NO_RSA
1399                 if (alg_a & SSL_aRSA)
1400                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1401 #else
1402                 if (0)
1403                         ;
1404 #endif
1405 #ifndef OPENSSL_NO_DSA
1406                 else if (alg_a & SSL_aDSS)
1407                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1408 #endif
1409                 }
1410         else
1411 #endif /* !OPENSSL_NO_SRP */
1412 #ifndef OPENSSL_NO_RSA
1413         if (alg_k & SSL_kRSA)
1414                 {
1415                 if ((rsa=RSA_new()) == NULL)
1416                         {
1417                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1418                         goto err;
1419                         }
1420                 n2s(p,i);
1421                 param_len=i+2;
1422                 if (param_len > n)
1423                         {
1424                         al=SSL_AD_DECODE_ERROR;
1425                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1426                         goto f_err;
1427                         }
1428                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1429                         {
1430                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1431                         goto err;
1432                         }
1433                 p+=i;
1434
1435                 n2s(p,i);
1436                 param_len+=i+2;
1437                 if (param_len > n)
1438                         {
1439                         al=SSL_AD_DECODE_ERROR;
1440                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1441                         goto f_err;
1442                         }
1443                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1444                         {
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1446                         goto err;
1447                         }
1448                 p+=i;
1449                 n-=param_len;
1450
1451                 /* this should be because we are using an export cipher */
1452                 if (alg_a & SSL_aRSA)
1453                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1454                 else
1455                         {
1456                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1457                         goto err;
1458                         }
1459                 s->session->sess_cert->peer_rsa_tmp=rsa;
1460                 rsa=NULL;
1461                 }
1462 #else /* OPENSSL_NO_RSA */
1463         if (0)
1464                 ;
1465 #endif
1466 #ifndef OPENSSL_NO_DH
1467         else if (alg_k & SSL_kEDH)
1468                 {
1469                 if ((dh=DH_new()) == NULL)
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1472                         goto err;
1473                         }
1474                 n2s(p,i);
1475                 param_len=i+2;
1476                 if (param_len > n)
1477                         {
1478                         al=SSL_AD_DECODE_ERROR;
1479                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1480                         goto f_err;
1481                         }
1482                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1483                         {
1484                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1485                         goto err;
1486                         }
1487                 p+=i;
1488
1489                 n2s(p,i);
1490                 param_len+=i+2;
1491                 if (param_len > n)
1492                         {
1493                         al=SSL_AD_DECODE_ERROR;
1494                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1495                         goto f_err;
1496                         }
1497                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1498                         {
1499                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1500                         goto err;
1501                         }
1502                 p+=i;
1503
1504                 n2s(p,i);
1505                 param_len+=i+2;
1506                 if (param_len > n)
1507                         {
1508                         al=SSL_AD_DECODE_ERROR;
1509                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1510                         goto f_err;
1511                         }
1512                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1515                         goto err;
1516                         }
1517                 p+=i;
1518                 n-=param_len;
1519
1520 #ifndef OPENSSL_NO_RSA
1521                 if (alg_a & SSL_aRSA)
1522                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1523 #else
1524                 if (0)
1525                         ;
1526 #endif
1527 #ifndef OPENSSL_NO_DSA
1528                 else if (alg_a & SSL_aDSS)
1529                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1530 #endif
1531                 /* else anonymous DH, so no certificate or pkey. */
1532
1533                 s->session->sess_cert->peer_dh_tmp=dh;
1534                 dh=NULL;
1535                 }
1536         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1537                 {
1538                 al=SSL_AD_ILLEGAL_PARAMETER;
1539                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1540                 goto f_err;
1541                 }
1542 #endif /* !OPENSSL_NO_DH */
1543
1544 #ifndef OPENSSL_NO_ECDH
1545         else if (alg_k & SSL_kEECDH)
1546                 {
1547                 EC_GROUP *ngroup;
1548                 const EC_GROUP *group;
1549
1550                 if ((ecdh=EC_KEY_new()) == NULL)
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1553                         goto err;
1554                         }
1555
1556                 /* Extract elliptic curve parameters and the
1557                  * server's ephemeral ECDH public key.
1558                  * Keep accumulating lengths of various components in
1559                  * param_len and make sure it never exceeds n.
1560                  */
1561
1562                 /* XXX: For now we only support named (not generic) curves
1563                  * and the ECParameters in this case is just three bytes.
1564                  */
1565                 param_len=3;
1566                 if ((param_len > n) ||
1567                     (*p != NAMED_CURVE_TYPE) ||
1568                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1569                         {
1570                         al=SSL_AD_INTERNAL_ERROR;
1571                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1572                         goto f_err;
1573                         }
1574
1575                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1576                 if (ngroup == NULL)
1577                         {
1578                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1579                         goto err;
1580                         }
1581                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1582                         {
1583                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1584                         goto err;
1585                         }
1586                 EC_GROUP_free(ngroup);
1587
1588                 group = EC_KEY_get0_group(ecdh);
1589
1590                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1591                     (EC_GROUP_get_degree(group) > 163))
1592                         {
1593                         al=SSL_AD_EXPORT_RESTRICTION;
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1595                         goto f_err;
1596                         }
1597
1598                 p+=3;
1599
1600                 /* Next, get the encoded ECPoint */
1601                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1602                     ((bn_ctx = BN_CTX_new()) == NULL))
1603                         {
1604                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1605                         goto err;
1606                         }
1607
1608                 encoded_pt_len = *p;  /* length of encoded point */
1609                 p+=1;
1610                 param_len += (1 + encoded_pt_len);
1611                 if ((param_len > n) ||
1612                     (EC_POINT_oct2point(group, srvr_ecpoint,
1613                         p, encoded_pt_len, bn_ctx) == 0))
1614                         {
1615                         al=SSL_AD_DECODE_ERROR;
1616                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1617                         goto f_err;
1618                         }
1619
1620                 n-=param_len;
1621                 p+=encoded_pt_len;
1622
1623                 /* The ECC/TLS specification does not mention
1624                  * the use of DSA to sign ECParameters in the server
1625                  * key exchange message. We do support RSA and ECDSA.
1626                  */
1627                 if (0) ;
1628 #ifndef OPENSSL_NO_RSA
1629                 else if (alg_a & SSL_aRSA)
1630                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1631 #endif
1632 #ifndef OPENSSL_NO_ECDSA
1633                 else if (alg_a & SSL_aECDSA)
1634                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1635 #endif
1636                 /* else anonymous ECDH, so no certificate or pkey. */
1637                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1638                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1639                 ecdh=NULL;
1640                 BN_CTX_free(bn_ctx);
1641                 bn_ctx = NULL;
1642                 EC_POINT_free(srvr_ecpoint);
1643                 srvr_ecpoint = NULL;
1644                 }
1645         else if (alg_k)
1646                 {
1647                 al=SSL_AD_UNEXPECTED_MESSAGE;
1648                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1649                 goto f_err;
1650                 }
1651 #endif /* !OPENSSL_NO_ECDH */
1652
1653
1654         /* p points to the next byte, there are 'n' bytes left */
1655
1656         /* if it was signed, check the signature */
1657         if (pkey != NULL)
1658                 {
1659                 if (s->version >= TLS1_2_VERSION)
1660                         {
1661                         int sigalg = tls12_get_sigid(pkey);
1662                         /* Should never happen */
1663                         if (sigalg == -1)
1664                                 {
1665                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1666                                 goto err;
1667                                 }
1668                         /* Check key type is consistent with signature */
1669                         if (sigalg != (int)p[1])
1670                                 {
1671                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1672                                 al=SSL_AD_DECODE_ERROR;
1673                                 goto f_err;
1674                                 }
1675                         md = tls12_get_hash(p[0]);
1676                         if (md == NULL)
1677                                 {
1678                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1679                                 al=SSL_AD_DECODE_ERROR;
1680                                 goto f_err;
1681                                 }
1682 #ifdef SSL_DEBUG
1683 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1684 #endif
1685                         p += 2;
1686                         n -= 2;
1687                         }
1688                 else
1689                         md = EVP_sha1();
1690
1691                 n2s(p,i);
1692                 n-=2;
1693                 j=EVP_PKEY_size(pkey);
1694
1695                 if ((i != n) || (n > j) || (n <= 0))
1696                         {
1697                         /* wrong packet length */
1698                         al=SSL_AD_DECODE_ERROR;
1699                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1700                         goto f_err;
1701                         }
1702
1703 #ifndef OPENSSL_NO_RSA
1704                 if (pkey->type == EVP_PKEY_RSA && s->version < TLS1_2_VERSION)
1705                         {
1706                         int num;
1707
1708                         j=0;
1709                         q=md_buf;
1710                         for (num=2; num > 0; num--)
1711                                 {
1712                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1713                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1714                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1715                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1716                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1717                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1718                                 q+=i;
1719                                 j+=i;
1720                                 }
1721                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1722                                                                 pkey->pkey.rsa);
1723                         if (i < 0)
1724                                 {
1725                                 al=SSL_AD_DECRYPT_ERROR;
1726                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1727                                 goto f_err;
1728                                 }
1729                         if (i == 0)
1730                                 {
1731                                 /* bad signature */
1732                                 al=SSL_AD_DECRYPT_ERROR;
1733                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1734                                 goto f_err;
1735                                 }
1736                         }
1737                 else
1738 #endif
1739                         {
1740                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1741                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1742                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1743                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1744                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1745                                 {
1746                                 /* bad signature */
1747                                 al=SSL_AD_DECRYPT_ERROR;
1748                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1749                                 goto f_err;
1750                                 }
1751                         }
1752                 }
1753         else
1754                 {
1755                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1756                         /* aNULL or kPSK do not need public keys */
1757                         {
1758                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1759                         goto err;
1760                         }
1761                 /* still data left over */
1762                 if (n != 0)
1763                         {
1764                         al=SSL_AD_DECODE_ERROR;
1765                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1766                         goto f_err;
1767                         }
1768                 }
1769         EVP_PKEY_free(pkey);
1770         EVP_MD_CTX_cleanup(&md_ctx);
1771         return(1);
1772 f_err:
1773         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1774 err:
1775         EVP_PKEY_free(pkey);
1776 #ifndef OPENSSL_NO_RSA
1777         if (rsa != NULL)
1778                 RSA_free(rsa);
1779 #endif
1780 #ifndef OPENSSL_NO_DH
1781         if (dh != NULL)
1782                 DH_free(dh);
1783 #endif
1784 #ifndef OPENSSL_NO_ECDH
1785         BN_CTX_free(bn_ctx);
1786         EC_POINT_free(srvr_ecpoint);
1787         if (ecdh != NULL)
1788                 EC_KEY_free(ecdh);
1789 #endif
1790         EVP_MD_CTX_cleanup(&md_ctx);
1791         return(-1);
1792         }
1793
1794 int ssl3_get_certificate_request(SSL *s)
1795         {
1796         int ok,ret=0;
1797         unsigned long n,nc,l;
1798         unsigned int llen, ctype_num,i;
1799         X509_NAME *xn=NULL;
1800         const unsigned char *p,*q;
1801         unsigned char *d;
1802         STACK_OF(X509_NAME) *ca_sk=NULL;
1803
1804         n=s->method->ssl_get_message(s,
1805                 SSL3_ST_CR_CERT_REQ_A,
1806                 SSL3_ST_CR_CERT_REQ_B,
1807                 -1,
1808                 s->max_cert_list,
1809                 &ok);
1810
1811         if (!ok) return((int)n);
1812
1813         s->s3->tmp.cert_req=0;
1814
1815         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1816                 {
1817                 s->s3->tmp.reuse_message=1;
1818                 /* If we get here we don't need any cached handshake records
1819                  * as we wont be doing client auth.
1820                  */
1821                 if (s->s3->handshake_buffer)
1822                         {
1823                         if (!ssl3_digest_cached_records(s))
1824                                 goto err;
1825                         }
1826                 return(1);
1827                 }
1828
1829         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1830                 {
1831                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1832                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1833                 goto err;
1834                 }
1835
1836         /* TLS does not like anon-DH with client cert */
1837         if (s->version > SSL3_VERSION)
1838                 {
1839                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1840                         {
1841                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1842                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1843                         goto err;
1844                         }
1845                 }
1846
1847         p=d=(unsigned char *)s->init_msg;
1848
1849         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1850                 {
1851                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1852                 goto err;
1853                 }
1854
1855         /* get the certificate types */
1856         ctype_num= *(p++);
1857         if (ctype_num > SSL3_CT_NUMBER)
1858                 ctype_num=SSL3_CT_NUMBER;
1859         for (i=0; i<ctype_num; i++)
1860                 s->s3->tmp.ctype[i]= p[i];
1861         p+=ctype_num;
1862         /* HACK! For now just skip over signatature algorithms */
1863         if (s->version >= TLS1_2_VERSION)
1864                 {
1865                 n2s(p, llen);
1866                 /* Check we have enough room for signature algorithms and
1867                  * following length value.
1868                  */
1869                 if ((unsigned long)(p - d + llen + 2) > n)
1870                         {
1871                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1872                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
1873                         goto err;
1874                         }
1875                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
1876                         {
1877                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1878                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
1879                         goto err;
1880                         }
1881                 p += llen;
1882                 }
1883
1884         /* get the CA RDNs */
1885         n2s(p,llen);
1886 #if 0
1887 {
1888 FILE *out;
1889 out=fopen("/tmp/vsign.der","w");
1890 fwrite(p,1,llen,out);
1891 fclose(out);
1892 }
1893 #endif
1894
1895         if ((unsigned long)(p - d + llen) != n)
1896                 {
1897                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1898                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1899                 goto err;
1900                 }
1901
1902         for (nc=0; nc<llen; )
1903                 {
1904                 n2s(p,l);
1905                 if ((l+nc+2) > llen)
1906                         {
1907                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1908                                 goto cont; /* netscape bugs */
1909                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1910                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1911                         goto err;
1912                         }
1913
1914                 q=p;
1915
1916                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1917                         {
1918                         /* If netscape tolerance is on, ignore errors */
1919                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1920                                 goto cont;
1921                         else
1922                                 {
1923                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1924                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1925                                 goto err;
1926                                 }
1927                         }
1928
1929                 if (q != (p+l))
1930                         {
1931                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1932                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1933                         goto err;
1934                         }
1935                 if (!sk_X509_NAME_push(ca_sk,xn))
1936                         {
1937                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1938                         goto err;
1939                         }
1940
1941                 p+=l;
1942                 nc+=l+2;
1943                 }
1944
1945         if (0)
1946                 {
1947 cont:
1948                 ERR_clear_error();
1949                 }
1950
1951         /* we should setup a certificate to return.... */
1952         s->s3->tmp.cert_req=1;
1953         s->s3->tmp.ctype_num=ctype_num;
1954         if (s->s3->tmp.ca_names != NULL)
1955                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1956         s->s3->tmp.ca_names=ca_sk;
1957         ca_sk=NULL;
1958
1959         ret=1;
1960 err:
1961         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1962         return(ret);
1963         }
1964
1965 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1966         {
1967         return(X509_NAME_cmp(*a,*b));
1968         }
1969 #ifndef OPENSSL_NO_TLSEXT
1970 int ssl3_get_new_session_ticket(SSL *s)
1971         {
1972         int ok,al,ret=0, ticklen;
1973         long n;
1974         const unsigned char *p;
1975         unsigned char *d;
1976
1977         n=s->method->ssl_get_message(s,
1978                 SSL3_ST_CR_SESSION_TICKET_A,
1979                 SSL3_ST_CR_SESSION_TICKET_B,
1980                 -1,
1981                 16384,
1982                 &ok);
1983
1984         if (!ok)
1985                 return((int)n);
1986
1987         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1988                 {
1989                 s->s3->tmp.reuse_message=1;
1990                 return(1);
1991                 }
1992         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1993                 {
1994                 al=SSL_AD_UNEXPECTED_MESSAGE;
1995                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1996                 goto f_err;
1997                 }
1998         if (n < 6)
1999                 {
2000                 /* need at least ticket_lifetime_hint + ticket length */
2001                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2002                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2003                 goto f_err;
2004                 }
2005
2006         p=d=(unsigned char *)s->init_msg;
2007         n2l(p, s->session->tlsext_tick_lifetime_hint);
2008         n2s(p, ticklen);
2009         /* ticket_lifetime_hint + ticket_length + ticket */
2010         if (ticklen + 6 != n)
2011                 {
2012                 al = SSL3_AL_FATAL,SSL_AD_DECODE_ERROR;
2013                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2014                 goto f_err;
2015                 }
2016         if (s->session->tlsext_tick)
2017                 {
2018                 OPENSSL_free(s->session->tlsext_tick);
2019                 s->session->tlsext_ticklen = 0;
2020                 }
2021         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2022         if (!s->session->tlsext_tick)
2023                 {
2024                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2025                 goto err;
2026                 }
2027         memcpy(s->session->tlsext_tick, p, ticklen);
2028         s->session->tlsext_ticklen = ticklen;
2029         /* There are two ways to detect a resumed ticket sesion.
2030          * One is to set an appropriate session ID and then the server
2031          * must return a match in ServerHello. This allows the normal
2032          * client session ID matching to work and we know much
2033          * earlier that the ticket has been accepted.
2034          *
2035          * The other way is to set zero length session ID when the
2036          * ticket is presented and rely on the handshake to determine
2037          * session resumption.
2038          *
2039          * We choose the former approach because this fits in with
2040          * assumptions elsewhere in OpenSSL. The session ID is set
2041          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2042          * ticket.
2043          */
2044         EVP_Digest(p, ticklen,
2045                         s->session->session_id, &s->session->session_id_length,
2046 #ifndef OPENSSL_NO_SHA256
2047                                                         EVP_sha256(), NULL);
2048 #else
2049                                                         EVP_sha1(), NULL);
2050 #endif
2051         ret=1;
2052         return(ret);
2053 f_err:
2054         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2055 err:
2056         return(-1);
2057         }
2058
2059 int ssl3_get_cert_status(SSL *s)
2060         {
2061         int ok, al;
2062         unsigned long resplen,n;
2063         const unsigned char *p;
2064
2065         n=s->method->ssl_get_message(s,
2066                 SSL3_ST_CR_CERT_STATUS_A,
2067                 SSL3_ST_CR_CERT_STATUS_B,
2068                 SSL3_MT_CERTIFICATE_STATUS,
2069                 16384,
2070                 &ok);
2071
2072         if (!ok) return((int)n);
2073         if (n < 4)
2074                 {
2075                 /* need at least status type + length */
2076                 al = SSL_AD_DECODE_ERROR;
2077                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2078                 goto f_err;
2079                 }
2080         p = (unsigned char *)s->init_msg;
2081         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2082                 {
2083                 al = SSL_AD_DECODE_ERROR;
2084                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2085                 goto f_err;
2086                 }
2087         n2l3(p, resplen);
2088         if (resplen + 4 != n)
2089                 {
2090                 al = SSL_AD_DECODE_ERROR;
2091                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2092                 goto f_err;
2093                 }
2094         if (s->tlsext_ocsp_resp)
2095                 OPENSSL_free(s->tlsext_ocsp_resp);
2096         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2097         if (!s->tlsext_ocsp_resp)
2098                 {
2099                 al = SSL_AD_INTERNAL_ERROR;
2100                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2101                 goto f_err;
2102                 }
2103         s->tlsext_ocsp_resplen = resplen;
2104         if (s->ctx->tlsext_status_cb)
2105                 {
2106                 int ret;
2107                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2108                 if (ret == 0)
2109                         {
2110                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2111                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2112                         goto f_err;
2113                         }
2114                 if (ret < 0)
2115                         {
2116                         al = SSL_AD_INTERNAL_ERROR;
2117                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2118                         goto f_err;
2119                         }
2120                 }
2121         return 1;
2122 f_err:
2123         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2124         return(-1);
2125         }
2126 #endif
2127
2128 int ssl3_get_server_done(SSL *s)
2129         {
2130         int ok,ret=0;
2131         long n;
2132
2133         n=s->method->ssl_get_message(s,
2134                 SSL3_ST_CR_SRVR_DONE_A,
2135                 SSL3_ST_CR_SRVR_DONE_B,
2136                 SSL3_MT_SERVER_DONE,
2137                 30, /* should be very small, like 0 :-) */
2138                 &ok);
2139
2140         if (!ok) return((int)n);
2141         if (n > 0)
2142                 {
2143                 /* should contain no data */
2144                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2145                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2146                 return -1;
2147                 }
2148         ret=1;
2149         return(ret);
2150         }
2151
2152
2153 int ssl3_send_client_key_exchange(SSL *s)
2154         {
2155         unsigned char *p,*d;
2156         int n;
2157         unsigned long alg_k;
2158 #ifndef OPENSSL_NO_RSA
2159         unsigned char *q;
2160         EVP_PKEY *pkey=NULL;
2161 #endif
2162 #ifndef OPENSSL_NO_KRB5
2163         KSSL_ERR kssl_err;
2164 #endif /* OPENSSL_NO_KRB5 */
2165 #ifndef OPENSSL_NO_ECDH
2166         EC_KEY *clnt_ecdh = NULL;
2167         const EC_POINT *srvr_ecpoint = NULL;
2168         EVP_PKEY *srvr_pub_pkey = NULL;
2169         unsigned char *encodedPoint = NULL;
2170         int encoded_pt_len = 0;
2171         BN_CTX * bn_ctx = NULL;
2172 #endif
2173
2174         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2175                 {
2176                 d=(unsigned char *)s->init_buf->data;
2177                 p= &(d[4]);
2178
2179                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2180
2181                 /* Fool emacs indentation */
2182                 if (0) {}
2183 #ifndef OPENSSL_NO_RSA
2184                 else if (alg_k & SSL_kRSA)
2185                         {
2186                         RSA *rsa;
2187                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2188
2189                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2190                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2191                         else
2192                                 {
2193                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2194                                 if ((pkey == NULL) ||
2195                                         (pkey->type != EVP_PKEY_RSA) ||
2196                                         (pkey->pkey.rsa == NULL))
2197                                         {
2198                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2199                                         goto err;
2200                                         }
2201                                 rsa=pkey->pkey.rsa;
2202                                 EVP_PKEY_free(pkey);
2203                                 }
2204
2205                         tmp_buf[0]=s->client_version>>8;
2206                         tmp_buf[1]=s->client_version&0xff;
2207                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2208                                         goto err;
2209
2210                         s->session->master_key_length=sizeof tmp_buf;
2211
2212                         q=p;
2213                         /* Fix buf for TLS and beyond */
2214                         if (s->version > SSL3_VERSION)
2215                                 p+=2;
2216                         n=RSA_public_encrypt(sizeof tmp_buf,
2217                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2218 #ifdef PKCS1_CHECK
2219                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2220                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2221 #endif
2222                         if (n <= 0)
2223                                 {
2224                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2225                                 goto err;
2226                                 }
2227
2228                         /* Fix buf for TLS and beyond */
2229                         if (s->version > SSL3_VERSION)
2230                                 {
2231                                 s2n(n,q);
2232                                 n+=2;
2233                                 }
2234
2235                         s->session->master_key_length=
2236                                 s->method->ssl3_enc->generate_master_secret(s,
2237                                         s->session->master_key,
2238                                         tmp_buf,sizeof tmp_buf);
2239                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2240                         }
2241 #endif
2242 #ifndef OPENSSL_NO_KRB5
2243                 else if (alg_k & SSL_kKRB5)
2244                         {
2245                         krb5_error_code krb5rc;
2246                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2247                         /*  krb5_data   krb5_ap_req;  */
2248                         krb5_data       *enc_ticket;
2249                         krb5_data       authenticator, *authp = NULL;
2250                         EVP_CIPHER_CTX  ciph_ctx;
2251                         const EVP_CIPHER *enc = NULL;
2252                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2253                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2254                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2255                                                 + EVP_MAX_IV_LENGTH];
2256                         int             padl, outl = sizeof(epms);
2257
2258                         EVP_CIPHER_CTX_init(&ciph_ctx);
2259
2260 #ifdef KSSL_DEBUG
2261                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2262                                 alg_k, SSL_kKRB5);
2263 #endif  /* KSSL_DEBUG */
2264
2265                         authp = NULL;
2266 #ifdef KRB5SENDAUTH
2267                         if (KRB5SENDAUTH)  authp = &authenticator;
2268 #endif  /* KRB5SENDAUTH */
2269
2270                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2271                                 &kssl_err);
2272                         enc = kssl_map_enc(kssl_ctx->enctype);
2273                         if (enc == NULL)
2274                             goto err;
2275 #ifdef KSSL_DEBUG
2276                         {
2277                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2278                         if (krb5rc && kssl_err.text)
2279                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2280                         }
2281 #endif  /* KSSL_DEBUG */
2282
2283                         if (krb5rc)
2284                                 {
2285                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2286                                                 SSL_AD_HANDSHAKE_FAILURE);
2287                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2288                                                 kssl_err.reason);
2289                                 goto err;
2290                                 }
2291
2292                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2293                         **  in place of RFC 2712 KerberosWrapper, as in:
2294                         **
2295                         **  Send ticket (copy to *p, set n = length)
2296                         **  n = krb5_ap_req.length;
2297                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2298                         **  if (krb5_ap_req.data)
2299                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2300                         **
2301                         **  Now using real RFC 2712 KerberosWrapper
2302                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2303                         **  Note: 2712 "opaque" types are here replaced
2304                         **  with a 2-byte length followed by the value.
2305                         **  Example:
2306                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2307                         **  Where "xx xx" = length bytes.  Shown here with
2308                         **  optional authenticator omitted.
2309                         */
2310
2311                         /*  KerberosWrapper.Ticket              */
2312                         s2n(enc_ticket->length,p);
2313                         memcpy(p, enc_ticket->data, enc_ticket->length);
2314                         p+= enc_ticket->length;
2315                         n = enc_ticket->length + 2;
2316
2317                         /*  KerberosWrapper.Authenticator       */
2318                         if (authp  &&  authp->length)
2319                                 {
2320                                 s2n(authp->length,p);
2321                                 memcpy(p, authp->data, authp->length);
2322                                 p+= authp->length;
2323                                 n+= authp->length + 2;
2324
2325                                 free(authp->data);
2326                                 authp->data = NULL;
2327                                 authp->length = 0;
2328                                 }
2329                         else
2330                                 {
2331                                 s2n(0,p);/*  null authenticator length  */
2332                                 n+=2;
2333                                 }
2334
2335                             tmp_buf[0]=s->client_version>>8;
2336                             tmp_buf[1]=s->client_version&0xff;
2337                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2338                                 goto err;
2339
2340                         /*  20010420 VRS.  Tried it this way; failed.
2341                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2342                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2343                         **                              kssl_ctx->length);
2344                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2345                         */
2346
2347                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2348                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2349                                 kssl_ctx->key,iv);
2350                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2351                                 sizeof tmp_buf);
2352                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2353                         outl += padl;
2354                         if (outl > (int)sizeof epms)
2355                                 {
2356                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2357                                 goto err;
2358                                 }
2359                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2360
2361                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2362                         s2n(outl,p);
2363                         memcpy(p, epms, outl);
2364                         p+=outl;
2365                         n+=outl + 2;
2366
2367                         s->session->master_key_length=
2368                                 s->method->ssl3_enc->generate_master_secret(s,
2369                                         s->session->master_key,
2370                                         tmp_buf, sizeof tmp_buf);
2371
2372                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2373                         OPENSSL_cleanse(epms, outl);
2374                         }
2375 #endif
2376 #ifndef OPENSSL_NO_DH
2377                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2378                         {
2379                         DH *dh_srvr,*dh_clnt;
2380
2381                         if (s->session->sess_cert == NULL)
2382                                 {
2383                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2384                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2385                                 goto err;
2386                                 }
2387
2388                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2389                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2390                         else
2391                                 {
2392                                 /* we get them from the cert */
2393                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2394                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2395                                 goto err;
2396                                 }
2397
2398                         /* generate a new random key */
2399                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2400                                 {
2401                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2402                                 goto err;
2403                                 }
2404                         if (!DH_generate_key(dh_clnt))
2405                                 {
2406                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2407                                 goto err;
2408                                 }
2409
2410                         /* use the 'p' output buffer for the DH key, but
2411                          * make sure to clear it out afterwards */
2412
2413                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2414
2415                         if (n <= 0)
2416                                 {
2417                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2418                                 goto err;
2419                                 }
2420
2421                         /* generate master key from the result */
2422                         s->session->master_key_length=
2423                                 s->method->ssl3_enc->generate_master_secret(s,
2424                                         s->session->master_key,p,n);
2425                         /* clean up */
2426                         memset(p,0,n);
2427
2428                         /* send off the data */
2429                         n=BN_num_bytes(dh_clnt->pub_key);
2430                         s2n(n,p);
2431                         BN_bn2bin(dh_clnt->pub_key,p);
2432                         n+=2;
2433
2434                         DH_free(dh_clnt);
2435
2436                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2437                         }
2438 #endif
2439
2440 #ifndef OPENSSL_NO_ECDH
2441                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2442                         {
2443                         const EC_GROUP *srvr_group = NULL;
2444                         EC_KEY *tkey;
2445                         int ecdh_clnt_cert = 0;
2446                         int field_size = 0;
2447
2448                         /* Did we send out the client's
2449                          * ECDH share for use in premaster
2450                          * computation as part of client certificate?
2451                          * If so, set ecdh_clnt_cert to 1.
2452                          */
2453                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2454                                 {
2455                                 /* XXX: For now, we do not support client
2456                                  * authentication using ECDH certificates.
2457                                  * To add such support, one needs to add
2458                                  * code that checks for appropriate
2459                                  * conditions and sets ecdh_clnt_cert to 1.
2460                                  * For example, the cert have an ECC
2461                                  * key on the same curve as the server's
2462                                  * and the key should be authorized for
2463                                  * key agreement.
2464                                  *
2465                                  * One also needs to add code in ssl3_connect
2466                                  * to skip sending the certificate verify
2467                                  * message.
2468                                  *
2469                                  * if ((s->cert->key->privatekey != NULL) &&
2470                                  *     (s->cert->key->privatekey->type ==
2471                                  *      EVP_PKEY_EC) && ...)
2472                                  * ecdh_clnt_cert = 1;
2473                                  */
2474                                 }
2475
2476                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2477                                 {
2478                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2479                                 }
2480                         else
2481                                 {
2482                                 /* Get the Server Public Key from Cert */
2483                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2484                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2485                                 if ((srvr_pub_pkey == NULL) ||
2486                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2487                                     (srvr_pub_pkey->pkey.ec == NULL))
2488                                         {
2489                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2490                                             ERR_R_INTERNAL_ERROR);
2491                                         goto err;
2492                                         }
2493
2494                                 tkey = srvr_pub_pkey->pkey.ec;
2495                                 }
2496
2497                         srvr_group   = EC_KEY_get0_group(tkey);
2498                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2499
2500                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2501                                 {
2502                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2503                                     ERR_R_INTERNAL_ERROR);
2504                                 goto err;
2505                                 }
2506
2507                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2508                                 {
2509                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2510                                 goto err;
2511                                 }
2512
2513                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2514                                 {
2515                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2516                                 goto err;
2517                                 }
2518                         if (ecdh_clnt_cert)
2519                                 {
2520                                 /* Reuse key info from our certificate
2521                                  * We only need our private key to perform
2522                                  * the ECDH computation.
2523                                  */
2524                                 const BIGNUM *priv_key;
2525                                 tkey = s->cert->key->privatekey->pkey.ec;
2526                                 priv_key = EC_KEY_get0_private_key(tkey);
2527                                 if (priv_key == NULL)
2528                                         {
2529                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2530                                         goto err;
2531                                         }
2532                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2533                                         {
2534                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2535                                         goto err;
2536                                         }
2537                                 }
2538                         else
2539                                 {
2540                                 /* Generate a new ECDH key pair */
2541                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2542                                         {
2543                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2544                                         goto err;
2545                                         }
2546                                 }
2547
2548                         /* use the 'p' output buffer for the ECDH key, but
2549                          * make sure to clear it out afterwards
2550                          */
2551
2552                         field_size = EC_GROUP_get_degree(srvr_group);
2553                         if (field_size <= 0)
2554                                 {
2555                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2556                                        ERR_R_ECDH_LIB);
2557                                 goto err;
2558                                 }
2559                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2560                         if (n <= 0)
2561                                 {
2562                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2563                                        ERR_R_ECDH_LIB);
2564                                 goto err;
2565                                 }
2566
2567                         /* generate master key from the result */
2568                         s->session->master_key_length = s->method->ssl3_enc \
2569                             -> generate_master_secret(s,
2570                                 s->session->master_key,
2571                                 p, n);
2572
2573                         memset(p, 0, n); /* clean up */
2574
2575                         if (ecdh_clnt_cert)
2576                                 {
2577                                 /* Send empty client key exch message */
2578                                 n = 0;
2579                                 }
2580                         else
2581                                 {
2582                                 /* First check the size of encoding and
2583                                  * allocate memory accordingly.
2584                                  */
2585                                 encoded_pt_len =
2586                                     EC_POINT_point2oct(srvr_group,
2587                                         EC_KEY_get0_public_key(clnt_ecdh),
2588                                         POINT_CONVERSION_UNCOMPRESSED,
2589                                         NULL, 0, NULL);
2590
2591                                 encodedPoint = (unsigned char *)
2592                                     OPENSSL_malloc(encoded_pt_len *
2593                                         sizeof(unsigned char));
2594                                 bn_ctx = BN_CTX_new();
2595                                 if ((encodedPoint == NULL) ||
2596                                     (bn_ctx == NULL))
2597                                         {
2598                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2599                                         goto err;
2600                                         }
2601
2602                                 /* Encode the public key */
2603                                 n = EC_POINT_point2oct(srvr_group,
2604                                     EC_KEY_get0_public_key(clnt_ecdh),
2605                                     POINT_CONVERSION_UNCOMPRESSED,
2606                                     encodedPoint, encoded_pt_len, bn_ctx);
2607
2608                                 *p = n; /* length of encoded point */
2609                                 /* Encoded point will be copied here */
2610                                 p += 1;
2611                                 /* copy the point */
2612                                 memcpy((unsigned char *)p, encodedPoint, n);
2613                                 /* increment n to account for length field */
2614                                 n += 1;
2615                                 }
2616
2617                         /* Free allocated memory */
2618                         BN_CTX_free(bn_ctx);
2619                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2620                         if (clnt_ecdh != NULL)
2621                                  EC_KEY_free(clnt_ecdh);
2622                         EVP_PKEY_free(srvr_pub_pkey);
2623                         }
2624 #endif /* !OPENSSL_NO_ECDH */
2625                 else if (alg_k & SSL_kGOST)
2626                         {
2627                         /* GOST key exchange message creation */
2628                         EVP_PKEY_CTX *pkey_ctx;
2629                         X509 *peer_cert;
2630                         size_t msglen;
2631                         unsigned int md_len;
2632                         int keytype;
2633                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2634                         EVP_MD_CTX *ukm_hash;
2635                         EVP_PKEY *pub_key;
2636
2637                         /* Get server sertificate PKEY and create ctx from it */
2638                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2639                         if (!peer_cert)
2640                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2641                         if (!peer_cert)         {
2642                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2643                                         goto err;
2644                                 }
2645
2646                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2647                         /* If we have send a certificate, and certificate key
2648
2649                          * parameters match those of server certificate, use
2650                          * certificate key for key exchange
2651                          */
2652
2653                          /* Otherwise, generate ephemeral key pair */
2654
2655                         EVP_PKEY_encrypt_init(pkey_ctx);
2656                           /* Generate session key */
2657                     RAND_bytes(premaster_secret,32);
2658                         /* If we have client certificate, use its secret as peer key */
2659                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2660                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2661                                         /* If there was an error - just ignore it. Ephemeral key
2662                                         * would be used
2663                                         */
2664                                         ERR_clear_error();
2665                                 }
2666                         }
2667                         /* Compute shared IV and store it in algorithm-specific
2668                          * context data */
2669                         ukm_hash = EVP_MD_CTX_create();
2670                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2671                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2672                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2673                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2674                         EVP_MD_CTX_destroy(ukm_hash);
2675                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2676                                 8,shared_ukm)<0) {
2677                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2678                                                 SSL_R_LIBRARY_BUG);
2679                                         goto err;
2680                                 }
2681                         /* Make GOST keytransport blob message */
2682                         /*Encapsulate it into sequence */
2683                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2684                         msglen=255;
2685                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2686                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2687                                         SSL_R_LIBRARY_BUG);
2688                                 goto err;
2689                         }
2690                         if (msglen >= 0x80)
2691                                 {
2692                                 *(p++)=0x81;
2693                                 *(p++)= msglen & 0xff;
2694                                 n=msglen+3;
2695                                 }
2696                         else
2697                                 {
2698                                 *(p++)= msglen & 0xff;
2699                                 n=msglen+2;
2700                                 }
2701                         memcpy(p, tmp, msglen);
2702                         /* Check if pubkey from client certificate was used */
2703                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2704                                 {
2705                                 /* Set flag "skip certificate verify" */
2706                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2707                                 }
2708                         EVP_PKEY_CTX_free(pkey_ctx);
2709                         s->session->master_key_length=
2710                                 s->method->ssl3_enc->generate_master_secret(s,
2711                                         s->session->master_key,premaster_secret,32);
2712                         EVP_PKEY_free(pub_key);
2713
2714                         }
2715 #ifndef OPENSSL_NO_SRP
2716                 else if (alg_k & SSL_kSRP)
2717                         {
2718                         if (s->srp_ctx.A != NULL)
2719                                 {
2720                                 /* send off the data */
2721                                 n=BN_num_bytes(s->srp_ctx.A);
2722                                 s2n(n,p);
2723                                 BN_bn2bin(s->srp_ctx.A,p);
2724                                 n+=2;
2725                                 }
2726                         else
2727                                 {
2728                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2729                                 goto err;
2730                                 }
2731                         if (s->session->srp_username != NULL)
2732                                 OPENSSL_free(s->session->srp_username);
2733                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2734                         if (s->session->srp_username == NULL)
2735                                 {
2736                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2737                                         ERR_R_MALLOC_FAILURE);
2738                                 goto err;
2739                                 }
2740
2741                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2742                                 {
2743                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2744                                 goto err;
2745                                 }
2746                         }
2747 #endif
2748 #ifndef OPENSSL_NO_PSK
2749                 else if (alg_k & SSL_kPSK)
2750                         {
2751                         char identity[PSK_MAX_IDENTITY_LEN];
2752                         unsigned char *t = NULL;
2753                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2754                         unsigned int pre_ms_len = 0, psk_len = 0;
2755                         int psk_err = 1;
2756
2757                         n = 0;
2758                         if (s->psk_client_callback == NULL)
2759                                 {
2760                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2761                                         SSL_R_PSK_NO_CLIENT_CB);
2762                                 goto err;
2763                                 }
2764
2765                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
2766                                 identity, PSK_MAX_IDENTITY_LEN,
2767                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2768                         if (psk_len > PSK_MAX_PSK_LEN)
2769                                 {
2770                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2771                                         ERR_R_INTERNAL_ERROR);
2772                                 goto psk_err;
2773                                 }
2774                         else if (psk_len == 0)
2775                                 {
2776                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2777                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
2778                                 goto psk_err;
2779                                 }
2780
2781                         /* create PSK pre_master_secret */
2782                         pre_ms_len = 2+psk_len+2+psk_len;
2783                         t = psk_or_pre_ms;
2784                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2785                         s2n(psk_len, t);
2786                         memset(t, 0, psk_len);
2787                         t+=psk_len;
2788                         s2n(psk_len, t);
2789
2790                         if (s->session->psk_identity_hint != NULL)
2791                                 OPENSSL_free(s->session->psk_identity_hint);
2792                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2793                         if (s->ctx->psk_identity_hint != NULL &&
2794                                 s->session->psk_identity_hint == NULL)
2795                                 {
2796                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2797                                         ERR_R_MALLOC_FAILURE);
2798                                 goto psk_err;
2799                                 }
2800
2801                         if (s->session->psk_identity != NULL)
2802                                 OPENSSL_free(s->session->psk_identity);
2803                         s->session->psk_identity = BUF_strdup(identity);
2804                         if (s->session->psk_identity == NULL)
2805                                 {
2806                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2807                                         ERR_R_MALLOC_FAILURE);
2808                                 goto psk_err;
2809                                 }
2810
2811                         s->session->master_key_length =
2812                                 s->method->ssl3_enc->generate_master_secret(s,
2813                                         s->session->master_key,
2814                                         psk_or_pre_ms, pre_ms_len);
2815                         n = strlen(identity);
2816                         s2n(n, p);
2817                         memcpy(p, identity, n);
2818                         n+=2;
2819                         psk_err = 0;
2820                 psk_err:
2821                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
2822                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2823                         if (psk_err != 0)
2824                                 {
2825                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
2826                                 goto err;
2827                                 }
2828                         }
2829 #endif
2830                 else
2831                         {
2832                         ssl3_send_alert(s, SSL3_AL_FATAL,
2833                             SSL_AD_HANDSHAKE_FAILURE);
2834                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2835                             ERR_R_INTERNAL_ERROR);
2836                         goto err;
2837                         }
2838
2839                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2840                 l2n3(n,d);
2841
2842                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2843                 /* number of bytes to write */
2844                 s->init_num=n+4;
2845                 s->init_off=0;
2846                 }
2847
2848         /* SSL3_ST_CW_KEY_EXCH_B */
2849         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2850 err:
2851 #ifndef OPENSSL_NO_ECDH
2852         BN_CTX_free(bn_ctx);
2853         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2854         if (clnt_ecdh != NULL)
2855                 EC_KEY_free(clnt_ecdh);
2856         EVP_PKEY_free(srvr_pub_pkey);
2857 #endif
2858         return(-1);
2859         }
2860
2861 int ssl3_send_client_verify(SSL *s)
2862         {
2863         unsigned char *p,*d;
2864         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2865         EVP_PKEY *pkey;
2866         EVP_PKEY_CTX *pctx=NULL;
2867         EVP_MD_CTX mctx;
2868         unsigned u=0;
2869         unsigned long n;
2870         int j;
2871
2872         EVP_MD_CTX_init(&mctx);
2873
2874         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2875                 {
2876                 d=(unsigned char *)s->init_buf->data;
2877                 p= &(d[4]);
2878                 pkey=s->cert->key->privatekey;
2879 /* Create context from key and test if sha1 is allowed as digest */
2880                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
2881                 EVP_PKEY_sign_init(pctx);
2882                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
2883                         {
2884                         if (s->version < TLS1_2_VERSION)
2885                                 s->method->ssl3_enc->cert_verify_mac(s,
2886                                                 NID_sha1,
2887                                                 &(data[MD5_DIGEST_LENGTH]));
2888                         }
2889                 else
2890                         {
2891                         ERR_clear_error();
2892                         }
2893                 /* For TLS v1.2 send signature algorithm and signature
2894                  * using agreed digest and cached handshake records.
2895                  */
2896                 if (s->version >= TLS1_2_VERSION)
2897                         {
2898                         long hdatalen = 0;
2899                         void *hdata;
2900                         const EVP_MD *md = s->cert->key->digest;
2901                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
2902                                                                 &hdata);
2903                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
2904                                 {
2905                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2906                                                 ERR_R_INTERNAL_ERROR);
2907                                 goto err;
2908                                 }
2909                         p += 2;
2910 #ifdef SSL_DEBUG
2911                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
2912                                                         EVP_MD_name(md));
2913 #endif
2914                         if (!EVP_SignInit_ex(&mctx, md, NULL)
2915                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
2916                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
2917                                 {
2918                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2919                                                 ERR_R_EVP_LIB);
2920                                 goto err;
2921                                 }
2922                         s2n(u,p);
2923                         n = u + 4;
2924                         if (!ssl3_digest_cached_records(s))
2925                                 goto err;
2926                         }
2927                 else
2928 #ifndef OPENSSL_NO_RSA
2929                 if (pkey->type == EVP_PKEY_RSA)
2930                         {
2931                         s->method->ssl3_enc->cert_verify_mac(s,
2932                                 NID_md5,
2933                                 &(data[0]));
2934                         if (RSA_sign(NID_md5_sha1, data,
2935                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2936                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2937                                 {
2938                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2939                                 goto err;
2940                                 }
2941                         s2n(u,p);
2942                         n=u+2;
2943                         }
2944                 else
2945 #endif
2946 #ifndef OPENSSL_NO_DSA
2947                         if (pkey->type == EVP_PKEY_DSA)
2948                         {
2949                         if (!DSA_sign(pkey->save_type,
2950                                 &(data[MD5_DIGEST_LENGTH]),
2951                                 SHA_DIGEST_LENGTH,&(p[2]),
2952                                 (unsigned int *)&j,pkey->pkey.dsa))
2953                                 {
2954                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2955                                 goto err;
2956                                 }
2957                         s2n(j,p);
2958                         n=j+2;
2959                         }
2960                 else
2961 #endif
2962 #ifndef OPENSSL_NO_ECDSA
2963                         if (pkey->type == EVP_PKEY_EC)
2964                         {
2965                         if (!ECDSA_sign(pkey->save_type,
2966                                 &(data[MD5_DIGEST_LENGTH]),
2967                                 SHA_DIGEST_LENGTH,&(p[2]),
2968                                 (unsigned int *)&j,pkey->pkey.ec))
2969                                 {
2970                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2971                                     ERR_R_ECDSA_LIB);
2972                                 goto err;
2973                                 }
2974                         s2n(j,p);
2975                         n=j+2;
2976                         }
2977                 else
2978 #endif
2979                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2980                 {
2981                 unsigned char signbuf[64];
2982                 int i;
2983                 size_t sigsize=64;
2984                 s->method->ssl3_enc->cert_verify_mac(s,
2985                         NID_id_GostR3411_94,
2986                         data);
2987                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
2988                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2989                         ERR_R_INTERNAL_ERROR);
2990                         goto err;
2991                 }
2992                 for (i=63,j=0; i>=0; j++, i--) {
2993                         p[2+j]=signbuf[i];
2994                 }
2995                 s2n(j,p);
2996                 n=j+2;
2997                 }
2998                 else
2999                 {
3000                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3001                         goto err;
3002                 }
3003                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3004                 l2n3(n,d);
3005
3006                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3007                 s->init_num=(int)n+4;
3008                 s->init_off=0;
3009                 }
3010         EVP_MD_CTX_cleanup(&mctx);
3011         EVP_PKEY_CTX_free(pctx);
3012         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3013 err:
3014         EVP_MD_CTX_cleanup(&mctx);
3015         EVP_PKEY_CTX_free(pctx);
3016         return(-1);
3017         }
3018
3019 int ssl3_send_client_certificate(SSL *s)
3020         {
3021         X509 *x509=NULL;
3022         EVP_PKEY *pkey=NULL;
3023         int i;
3024         unsigned long l;
3025
3026         if (s->state == SSL3_ST_CW_CERT_A)
3027                 {
3028                 if ((s->cert == NULL) ||
3029                         (s->cert->key->x509 == NULL) ||
3030                         (s->cert->key->privatekey == NULL))
3031                         s->state=SSL3_ST_CW_CERT_B;
3032                 else
3033                         s->state=SSL3_ST_CW_CERT_C;
3034                 }
3035
3036         /* We need to get a client cert */
3037         if (s->state == SSL3_ST_CW_CERT_B)
3038                 {
3039                 /* If we get an error, we need to
3040                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3041                  * We then get retied later */
3042                 i=0;
3043                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3044                 if (i < 0)
3045                         {
3046                         s->rwstate=SSL_X509_LOOKUP;
3047                         return(-1);
3048                         }
3049                 s->rwstate=SSL_NOTHING;
3050                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3051                         {
3052                         s->state=SSL3_ST_CW_CERT_B;
3053                         if (    !SSL_use_certificate(s,x509) ||
3054                                 !SSL_use_PrivateKey(s,pkey))
3055                                 i=0;
3056                         }
3057                 else if (i == 1)
3058                         {
3059                         i=0;
3060                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3061                         }
3062
3063                 if (x509 != NULL) X509_free(x509);
3064                 if (pkey != NULL) EVP_PKEY_free(pkey);
3065                 if (i == 0)
3066                         {
3067                         if (s->version == SSL3_VERSION)
3068                                 {
3069                                 s->s3->tmp.cert_req=0;
3070                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3071                                 return(1);
3072                                 }
3073                         else
3074                                 {
3075                                 s->s3->tmp.cert_req=2;
3076                                 }
3077                         }
3078
3079                 /* Ok, we have a cert */
3080                 s->state=SSL3_ST_CW_CERT_C;
3081                 }
3082
3083         if (s->state == SSL3_ST_CW_CERT_C)
3084                 {
3085                 s->state=SSL3_ST_CW_CERT_D;
3086                 l=ssl3_output_cert_chain(s,
3087                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3088                 s->init_num=(int)l;
3089                 s->init_off=0;
3090                 }
3091         /* SSL3_ST_CW_CERT_D */
3092         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3093         }
3094
3095 #define has_bits(i,m)   (((i)&(m)) == (m))
3096
3097 int ssl3_check_cert_and_algorithm(SSL *s)
3098         {
3099         int i,idx;
3100         long alg_k,alg_a;
3101         EVP_PKEY *pkey=NULL;
3102         SESS_CERT *sc;
3103 #ifndef OPENSSL_NO_RSA
3104         RSA *rsa;
3105 #endif
3106 #ifndef OPENSSL_NO_DH
3107         DH *dh;
3108 #endif
3109
3110         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3111         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3112
3113         /* we don't have a certificate */
3114         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3115                 return(1);
3116
3117         sc=s->session->sess_cert;
3118         if (sc == NULL)
3119                 {
3120                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3121                 goto err;
3122                 }
3123
3124 #ifndef OPENSSL_NO_RSA
3125         rsa=s->session->sess_cert->peer_rsa_tmp;
3126 #endif
3127 #ifndef OPENSSL_NO_DH
3128         dh=s->session->sess_cert->peer_dh_tmp;
3129 #endif
3130
3131         /* This is the passed certificate */
3132
3133         idx=sc->peer_cert_type;
3134 #ifndef OPENSSL_NO_ECDH
3135         if (idx == SSL_PKEY_ECC)
3136                 {
3137                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3138                                                                 s) == 0)
3139                         { /* check failed */
3140                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3141                         goto f_err;
3142                         }
3143                 else
3144                         {
3145                         return 1;
3146                         }
3147                 }
3148 #endif
3149         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3150         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3151         EVP_PKEY_free(pkey);
3152
3153
3154         /* Check that we have a certificate if we require one */
3155         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3156                 {
3157                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3158                 goto f_err;
3159                 }
3160 #ifndef OPENSSL_NO_DSA
3161         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3162                 {
3163                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3164                 goto f_err;
3165                 }
3166 #endif
3167 #ifndef OPENSSL_NO_RSA
3168         if ((alg_k & SSL_kRSA) &&
3169                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3170                 {
3171                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3172                 goto f_err;
3173                 }
3174 #endif
3175 #ifndef OPENSSL_NO_DH
3176         if ((alg_k & SSL_kEDH) &&
3177                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3178                 {
3179                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3180                 goto f_err;
3181                 }
3182         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3183                 {
3184                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3185                 goto f_err;
3186                 }
3187 #ifndef OPENSSL_NO_DSA
3188         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3189                 {
3190                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3191                 goto f_err;
3192                 }
3193 #endif
3194 #endif
3195
3196         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3197                 {
3198 #ifndef OPENSSL_NO_RSA
3199                 if (alg_k & SSL_kRSA)
3200                         {
3201                         if (rsa == NULL
3202                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3203                                 {
3204                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3205                                 goto f_err;
3206                                 }
3207                         }
3208                 else
3209 #endif
3210 #ifndef OPENSSL_NO_DH
3211                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3212                             {
3213                             if (dh == NULL
3214                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3215                                 {
3216                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3217                                 goto f_err;
3218                                 }
3219                         }
3220                 else
3221 #endif
3222                         {
3223                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3224                         goto f_err;
3225                         }
3226                 }
3227         return(1);
3228 f_err:
3229         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3230 err:
3231         return(0);
3232         }
3233
3234 /* Check to see if handshake is full or resumed. Usually this is just a
3235  * case of checking to see if a cache hit has occurred. In the case of
3236  * session tickets we have to check the next message to be sure.
3237  */
3238
3239 #ifndef OPENSSL_NO_TLSEXT
3240 # ifndef OPENSSL_NO_NEXTPROTONEG
3241 int ssl3_send_next_proto(SSL *s)
3242         {
3243         unsigned int len, padding_len;
3244         unsigned char *d;
3245
3246         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3247                 {
3248                 len = s->next_proto_negotiated_len;
3249                 padding_len = 32 - ((len + 2) % 32);
3250                 d = (unsigned char *)s->init_buf->data;
3251                 d[4] = len;
3252                 memcpy(d + 5, s->next_proto_negotiated, len);
3253                 d[5 + len] = padding_len;
3254                 memset(d + 6 + len, 0, padding_len);
3255                 *(d++)=SSL3_MT_NEXT_PROTO;
3256                 l2n3(2 + len + padding_len, d);
3257                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3258                 s->init_num = 4 + 2 + len + padding_len;
3259                 s->init_off = 0;
3260                 }
3261
3262         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3263         }
3264 # endif
3265
3266 int ssl3_check_finished(SSL *s)
3267         {
3268         int ok;
3269         long n;
3270         /* If we have no ticket it cannot be a resumed session. */
3271         if (!s->session->tlsext_tick)
3272                 return 1;
3273         /* this function is called when we really expect a Certificate
3274          * message, so permit appropriate message length */
3275         n=s->method->ssl_get_message(s,
3276                 SSL3_ST_CR_CERT_A,
3277                 SSL3_ST_CR_CERT_B,
3278                 -1,
3279                 s->max_cert_list,
3280                 &ok);
3281         if (!ok) return((int)n);
3282         s->s3->tmp.reuse_message = 1;
3283         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3284                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3285                 return 2;
3286
3287         return 1;
3288         }
3289 #endif
3290
3291 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3292         {
3293         int i = 0;
3294 #ifndef OPENSSL_NO_ENGINE
3295         if (s->ctx->client_cert_engine)
3296                 {
3297                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3298                                                 SSL_get_client_CA_list(s),
3299                                                 px509, ppkey, NULL, NULL, NULL);
3300                 if (i != 0)
3301                         return i;
3302                 }
3303 #endif
3304         if (s->ctx->client_cert_cb)
3305                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3306         return i;
3307         }