ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
 245                                                         s->version, NULL))
 246                                 {
 247                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
 248                                 return -1;
 249                                 }
 250
 251                         /* s->version=SSL3_VERSION; */
 252                         s->type=SSL_ST_CONNECT;
 253
 254                         if (s->init_buf == NULL)
 255                                 {
 256                                 if ((buf=BUF_MEM_new()) == NULL)
 257                                         {
 258                                         ret= -1;
 259                                         goto end;
 260                                         }
 261                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 262                                         {
 263                                         ret= -1;
 264                                         goto end;
 265                                         }
 266                                 s->init_buf=buf;
 267                                 buf=NULL;
 268                                 }
 269
 270                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 271
 272                         /* setup buffing BIO */
 273                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 274
 275                         /* don't push the buffering BIO quite yet */
 276
 277                         ssl3_init_finished_mac(s);
 278
 279                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 280                         s->ctx->stats.sess_connect++;
 281                         s->init_num=0;
 282                         break;
 283
 284                 case SSL3_ST_CW_CLNT_HELLO_A:
 285                 case SSL3_ST_CW_CLNT_HELLO_B:
 286
 287                         s->shutdown=0;
 288                         ret=ssl3_client_hello(s);
 289                         if (ret <= 0) goto end;
 290                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 291                         s->init_num=0;
 292
 293                         /* turn on buffering for the next lot of output */
 294                         if (s->bbio != s->wbio)
 295                                 s->wbio=BIO_push(s->bbio,s->wbio);
 296
 297                         break;
 298
 299                 case SSL3_ST_CR_SRVR_HELLO_A:
 300                 case SSL3_ST_CR_SRVR_HELLO_B:
 301                         ret=ssl3_get_server_hello(s);
 302                         if (ret <= 0) goto end;
 303
 304                         if (s->hit)
 305                                 {
 306                                 s->state=SSL3_ST_CR_FINISHED_A;
 307 #ifndef OPENSSL_NO_TLSEXT
 308                                 if (s->tlsext_ticket_expected)
 309                                         {
 310                                         /* receive renewed session ticket */
 311                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 312                                         }
 313 #endif
 314                                 }
 315                         else
 316                                 {
 317                                         s->state=SSL3_ST_CR_CERT_A;
 318                                 }
 319                         s->init_num=0;
 320                         break;
 321 #ifndef OPENSSL_NO_TLSEXT
 322                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_A:
 323                 case SSL3_ST_CR_SUPPLEMENTAL_DATA_B:
 324                         ret = tls1_get_server_supplemental_data(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_A;
 327                         s->init_num = 0;
 328                         break;
 329 #endif
 330                 case SSL3_ST_CR_CERT_A:
 331                 case SSL3_ST_CR_CERT_B:
 332 #ifndef OPENSSL_NO_TLSEXT
 333                         ret=ssl3_check_finished(s);
 334                         if (ret <= 0) goto end;
 335                         if (ret == 3)
 336                                 {
 337                                 s->state=SSL3_ST_CR_SUPPLEMENTAL_DATA_A;
 338                                 s->init_num=0;
 339                                 break;
 340                                 }
 341                         if (ret == 2)
 342                                 {
 343                                 s->hit = 1;
 344                                 if (s->tlsext_ticket_expected)
 345                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 346                                 else
 347                                         s->state=SSL3_ST_CR_FINISHED_A;
 348                                 s->init_num=0;
 349                                 break;
 350                                 }
 351 #endif
 352                         /* Check if it is anon DH/ECDH */
 353                         /* or PSK */
 354                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 355                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 356                                 {
 357                                 ret=ssl3_get_server_certificate(s);
 358                                 if (ret <= 0) goto end;
 359 #ifndef OPENSSL_NO_TLSEXT
 360                                 if (s->tlsext_status_expected)
 361                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 362                                 else
 363                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 364                                 }
 365                         else
 366                                 {
 367                                 skip = 1;
 368                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 369                                 }
 370 #else
 371                                 }
 372                         else
 373                                 skip=1;
 374
 375                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 376 #endif
 377                         s->init_num=0;
 378                         break;
 379
 380                 case SSL3_ST_CR_KEY_EXCH_A:
 381                 case SSL3_ST_CR_KEY_EXCH_B:
 382                         ret=ssl3_get_key_exchange(s);
 383                         if (ret <= 0) goto end;
 384                         s->state=SSL3_ST_CR_CERT_REQ_A;
 385                         s->init_num=0;
 386
 387                         /* at this point we check that we have the
 388                          * required stuff from the server */
 389                         if (!ssl3_check_cert_and_algorithm(s))
 390                                 {
 391                                 ret= -1;
 392                                 goto end;
 393                                 }
 394                         break;
 395
 396                 case SSL3_ST_CR_CERT_REQ_A:
 397                 case SSL3_ST_CR_CERT_REQ_B:
 398                         ret=ssl3_get_certificate_request(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 401                         s->init_num=0;
 402                         break;
 403
 404                 case SSL3_ST_CR_SRVR_DONE_A:
 405                 case SSL3_ST_CR_SRVR_DONE_B:
 406                         ret=ssl3_get_server_done(s);
 407                         if (ret <= 0) goto end;
 408 #ifndef OPENSSL_NO_SRP
 409                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 410                                 {
 411                                 if ((ret = SRP_Calc_A_param(s))<=0)
 412                                         {
 413                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 414                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 415                                         goto end;
 416                                         }
 417                                 }
 418 #endif
 419 #ifndef OPENSSL_NO_TLSEXT
 420                         s->state=SSL3_ST_CW_SUPPLEMENTAL_DATA_A;
 421 #else
 422                         if (s->s3->tmp.cert_req)
 423                                 s->state=SSL3_ST_CW_CERT_A;
 424                         else
 425                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 426 #endif
 427                         s->init_num=0;
 428
 429                         break;
 430
 431                 case SSL3_ST_CW_CERT_A:
 432                 case SSL3_ST_CW_CERT_B:
 433                 case SSL3_ST_CW_CERT_C:
 434                 case SSL3_ST_CW_CERT_D:
 435                         ret=ssl3_send_client_certificate(s);
 436                         if (ret <= 0) goto end;
 437                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_CW_KEY_EXCH_A:
 442                 case SSL3_ST_CW_KEY_EXCH_B:
 443                         ret=ssl3_send_client_key_exchange(s);
 444                         if (ret <= 0) goto end;
 445                         /* EAY EAY EAY need to check for DH fix cert
 446                          * sent back */
 447                         /* For TLS, cert_req is set to 2, so a cert chain
 448                          * of nothing is sent, but no verify packet is sent */
 449                         /* XXX: For now, we do not support client
 450                          * authentication in ECDH cipher suites with
 451                          * ECDH (rather than ECDSA) certificates.
 452                          * We need to skip the certificate verify
 453                          * message when client's ECDH public key is sent
 454                          * inside the client certificate.
 455                          */
 456                         if (s->s3->tmp.cert_req == 1)
 457                                 {
 458                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 459                                 }
 460                         else
 461                                 {
 462                                 s->state=SSL3_ST_CW_CHANGE_A;
 463                                 s->s3->change_cipher_spec=0;
 464                                 }
 465                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 466                                 {
 467                                 s->state=SSL3_ST_CW_CHANGE_A;
 468                                 s->s3->change_cipher_spec=0;
 469                                 }
 470
 471                         s->init_num=0;
 472                         break;
 473
 474                 case SSL3_ST_CW_CERT_VRFY_A:
 475                 case SSL3_ST_CW_CERT_VRFY_B:
 476                         ret=ssl3_send_client_verify(s);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CW_CHANGE_A;
 479                         s->init_num=0;
 480                         s->s3->change_cipher_spec=0;
 481                         break;
 482
 483                 case SSL3_ST_CW_CHANGE_A:
 484                 case SSL3_ST_CW_CHANGE_B:
 485                         ret=ssl3_send_change_cipher_spec(s,
 486                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 487                         if (ret <= 0) goto end;
 488
 489 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 490                         s->state=SSL3_ST_CW_FINISHED_A;
 491 #else
 492                         if (s->s3->next_proto_neg_seen)
 493                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 494                         else
 495                                 s->state=SSL3_ST_CW_FINISHED_A;
 496 #endif
 497                         s->init_num=0;
 498
 499                         s->session->cipher=s->s3->tmp.new_cipher;
 500 #ifdef OPENSSL_NO_COMP
 501                         s->session->compress_meth=0;
 502 #else
 503                         if (s->s3->tmp.new_compression == NULL)
 504                                 s->session->compress_meth=0;
 505                         else
 506                                 s->session->compress_meth=
 507                                         s->s3->tmp.new_compression->id;
 508 #endif
 509                         if (!s->method->ssl3_enc->setup_key_block(s))
 510                                 {
 511                                 ret= -1;
 512                                 goto end;
 513                                 }
 514
 515                         if (!s->method->ssl3_enc->change_cipher_state(s,
 516                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 517                                 {
 518                                 ret= -1;
 519                                 goto end;
 520                                 }
 521
 522                         break;
 523
 524 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 525                 case SSL3_ST_CW_NEXT_PROTO_A:
 526                 case SSL3_ST_CW_NEXT_PROTO_B:
 527                         ret=ssl3_send_next_proto(s);
 528                         if (ret <= 0) goto end;
 529                         s->state=SSL3_ST_CW_FINISHED_A;
 530                         break;
 531 #endif
 532
 533 #ifndef OPENSSL_NO_TLSEXT
 534                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_A:
 535                 case SSL3_ST_CW_SUPPLEMENTAL_DATA_B:
 536                         ret = tls1_send_client_supplemental_data(s, &skip);
 537                         if (ret <= 0) goto end;
 538                         if (s->s3->tmp.cert_req)
 539                                 s->state=SSL3_ST_CW_CERT_A;
 540                         else
 541                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 542                         s->init_num=0;
 543                         break;
 544 #endif
 545
 546                 case SSL3_ST_CW_FINISHED_A:
 547                 case SSL3_ST_CW_FINISHED_B:
 548                         ret=ssl3_send_finished(s,
 549                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 550                                 s->method->ssl3_enc->client_finished_label,
 551                                 s->method->ssl3_enc->client_finished_label_len);
 552                         if (ret <= 0) goto end;
 553                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 554                         s->state=SSL3_ST_CW_FLUSH;
 555
 556                         /* clear flags */
 557                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 558                         if (s->hit)
 559                                 {
 560                                 s->s3->tmp.next_state=SSL_ST_OK;
 561                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 562                                         {
 563                                         s->state=SSL_ST_OK;
 564                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 565                                         s->s3->delay_buf_pop_ret=0;
 566                                         }
 567                                 }
 568                         else
 569                                 {
 570 #ifndef OPENSSL_NO_TLSEXT
 571                                 /* Allow NewSessionTicket if ticket expected */
 572                                 if (s->tlsext_ticket_expected)
 573                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 574                                 else
 575 #endif
 576
 577                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 578                                 }
 579                         s->init_num=0;
 580                         break;
 581
 582 #ifndef OPENSSL_NO_TLSEXT
 583                 case SSL3_ST_CR_SESSION_TICKET_A:
 584                 case SSL3_ST_CR_SESSION_TICKET_B:
 585                         ret=ssl3_get_new_session_ticket(s);
 586                         if (ret <= 0) goto end;
 587                         s->state=SSL3_ST_CR_FINISHED_A;
 588                         s->init_num=0;
 589                 break;
 590
 591                 case SSL3_ST_CR_CERT_STATUS_A:
 592                 case SSL3_ST_CR_CERT_STATUS_B:
 593                         ret=ssl3_get_cert_status(s);
 594                         if (ret <= 0) goto end;
 595                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 596                         s->init_num=0;
 597                 break;
 598 #endif
 599
 600                 case SSL3_ST_CR_FINISHED_A:
 601                 case SSL3_ST_CR_FINISHED_B:
 602
 603                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 604                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 605                                 SSL3_ST_CR_FINISHED_B);
 606                         if (ret <= 0) goto end;
 607
 608                         if (s->hit)
 609                                 s->state=SSL3_ST_CW_CHANGE_A;
 610                         else
 611                                 s->state=SSL_ST_OK;
 612                         s->init_num=0;
 613                         break;
 614
 615                 case SSL3_ST_CW_FLUSH:
 616                         s->rwstate=SSL_WRITING;
 617                         if (BIO_flush(s->wbio) <= 0)
 618                                 {
 619                                 ret= -1;
 620                                 goto end;
 621                                 }
 622                         s->rwstate=SSL_NOTHING;
 623                         s->state=s->s3->tmp.next_state;
 624                         break;
 625
 626                 case SSL_ST_OK:
 627                         /* clean a few things up */
 628                         ssl3_cleanup_key_block(s);
 629
 630                         if (s->init_buf != NULL)
 631                                 {
 632                                 BUF_MEM_free(s->init_buf);
 633                                 s->init_buf=NULL;
 634                                 }
 635
 636                         /* If we are not 'joining' the last two packets,
 637                          * remove the buffering now */
 638                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 639                                 ssl_free_wbio_buffer(s);
 640                         /* else do it later in ssl3_write */
 641
 642                         s->init_num=0;
 643                         s->renegotiate=0;
 644                         s->new_session=0;
 645
 646                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 647                         if (s->hit) s->ctx->stats.sess_hit++;
 648
 649                         ret=1;
 650                         /* s->server=0; */
 651                         s->handshake_func=ssl3_connect;
 652                         s->ctx->stats.sess_connect_good++;
 653
 654                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 655
 656                         goto end;
 657                         /* break; */
 658
 659                 default:
 660                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 661                         ret= -1;
 662                         goto end;
 663                         /* break; */
 664                         }
 665
 666                 /* did we do anything */
 667                 if (!s->s3->tmp.reuse_message && !skip)
 668                         {
 669                         if (s->debug)
 670                                 {
 671                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 672                                         goto end;
 673                                 }
 674
 675                         if ((cb != NULL) && (s->state != state))
 676                                 {
 677                                 new_state=s->state;
 678                                 s->state=state;
 679                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 680                                 s->state=new_state;
 681                                 }
 682                         }
 683                 skip=0;
 684                 }
 685 end:
 686         s->in_handshake--;
 687         if (buf != NULL)
 688                 BUF_MEM_free(buf);
 689         if (cb != NULL)
 690                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 691         return(ret);
 692         }
 693
 694
 695 int ssl3_client_hello(SSL *s)
 696         {
 697         unsigned char *buf;
 698         unsigned char *p,*d;
 699         int i;
 700         unsigned long l;
 701         int al = 0;
 702 #ifndef OPENSSL_NO_COMP
 703         int j;
 704         SSL_COMP *comp;
 705 #endif
 706
 707         buf=(unsigned char *)s->init_buf->data;
 708         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 709                 {
 710                 SSL_SESSION *sess = s->session;
 711                 if ((sess == NULL) ||
 712                         (sess->ssl_version != s->version) ||
 713 #ifdef OPENSSL_NO_TLSEXT
 714                         !sess->session_id_length ||
 715 #else
 716                         (!sess->session_id_length && !sess->tlsext_tick) ||
 717 #endif
 718                         (sess->not_resumable))
 719                         {
 720                         if (!ssl_get_new_session(s,0))
 721                                 goto err;
 722                         }
 723                 if (s->method->version == DTLS_ANY_VERSION)
 724                         {
 725                         /* Determine which DTLS version to use */
 726                         int options = s->options;
 727                         /* If DTLS 1.2 disabled correct the version number */
 728                         if (options & SSL_OP_NO_DTLSv1_2)
 729                                 {
 730                                 if (tls1_suiteb(s))
 731                                         {
 732                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 733                                         goto err;
 734                                         }
 735                                 /* Disabling all versions is silly: return an
 736                                  * error.
 737                                  */
 738                                 if (options & SSL_OP_NO_DTLSv1)
 739                                         {
 740                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 741                                         goto err;
 742                                         }
 743                                 /* Update method so we don't use any DTLS 1.2
 744                                  * features.
 745                                  */
 746                                 s->method = DTLSv1_client_method();
 747                                 s->version = DTLS1_VERSION;
 748                                 }
 749                         else
 750                                 {
 751                                 /* We only support one version: update method */
 752                                 if (options & SSL_OP_NO_DTLSv1)
 753                                         s->method = DTLSv1_2_client_method();
 754                                 s->version = DTLS1_2_VERSION;
 755                                 }
 756                         s->client_version = s->version;
 757                         }
 758                 /* else use the pre-loaded session */
 759
 760                 p=s->s3->client_random;
 761
 762                 /* for DTLS if client_random is initialized, reuse it, we are
 763                  * required to use same upon reply to HelloVerify */
 764                 if (SSL_IS_DTLS(s))
 765                         {
 766                         size_t idx;
 767                         i = 1;
 768                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 769                                 {
 770                                 if (p[idx])
 771                                         {
 772                                         i = 0;
 773                                         break;
 774                                         }
 775                                 }
 776                         }
 777                 else
 778                         i = 1;
 779
 780                 if (i)
 781                         ssl_fill_hello_random(s, 0, p,
 782                                               sizeof(s->s3->client_random));
 783
 784                 /* Do the message type and length last */
 785                 d=p= ssl_handshake_start(s);
 786
 787                 /* version indicates the negotiated version: for example from
 788                  * an SSLv2/v3 compatible client hello). The client_version
 789                  * field is the maximum version we permit and it is also
 790                  * used in RSA encrypted premaster secrets. Some servers can
 791                  * choke if we initially report a higher version then
 792                  * renegotiate to a lower one in the premaster secret. This
 793                  * didn't happen with TLS 1.0 as most servers supported it
 794                  * but it can with TLS 1.1 or later if the server only supports
 795                  * 1.0.
 796                  *
 797                  * Possible scenario with previous logic:
 798                  *      1. Client hello indicates TLS 1.2
 799                  *      2. Server hello says TLS 1.0
 800                  *      3. RSA encrypted premaster secret uses 1.2.
 801                  *      4. Handhaked proceeds using TLS 1.0.
 802                  *      5. Server sends hello request to renegotiate.
 803                  *      6. Client hello indicates TLS v1.0 as we now
 804                  *         know that is maximum server supports.
 805                  *      7. Server chokes on RSA encrypted premaster secret
 806                  *         containing version 1.0.
 807                  *
 808                  * For interoperability it should be OK to always use the
 809                  * maximum version we support in client hello and then rely
 810                  * on the checking of version to ensure the servers isn't
 811                  * being inconsistent: for example initially negotiating with
 812                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 813                  * client_version in client hello and not resetting it to
 814                  * the negotiated version.
 815                  */
 816 #if 0
 817                 *(p++)=s->version>>8;
 818                 *(p++)=s->version&0xff;
 819                 s->client_version=s->version;
 820 #else
 821                 *(p++)=s->client_version>>8;
 822                 *(p++)=s->client_version&0xff;
 823 #endif
 824
 825                 /* Random stuff */
 826                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 827                 p+=SSL3_RANDOM_SIZE;
 828
 829                 /* Session ID */
 830                 if (s->new_session)
 831                         i=0;
 832                 else
 833                         i=s->session->session_id_length;
 834                 *(p++)=i;
 835                 if (i != 0)
 836                         {
 837                         if (i > (int)sizeof(s->session->session_id))
 838                                 {
 839                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 840                                 goto err;
 841                                 }
 842                         memcpy(p,s->session->session_id,i);
 843                         p+=i;
 844                         }
 845
 846                 /* cookie stuff for DTLS */
 847                 if (SSL_IS_DTLS(s))
 848                         {
 849                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 850                                 {
 851                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 852                                 goto err;
 853                                 }
 854                         *(p++) = s->d1->cookie_len;
 855                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 856                         p += s->d1->cookie_len;
 857                         }
 858
 859                 /* Ciphers supported */
 860                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 861                 if (i == 0)
 862                         {
 863                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 864                         goto err;
 865                         }
 866 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 867                         /* Some servers hang if client hello > 256 bytes
 868                          * as hack workaround chop number of supported ciphers
 869                          * to keep it well below this if we use TLS v1.2
 870                          */
 871                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 872                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 873                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 874 #endif
 875                 s2n(i,p);
 876                 p+=i;
 877
 878                 /* COMPRESSION */
 879 #ifdef OPENSSL_NO_COMP
 880                 *(p++)=1;
 881 #else
 882
 883                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
 884                         j=0;
 885                 else
 886                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 887                 *(p++)=1+j;
 888                 for (i=0; i<j; i++)
 889                         {
 890                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 891                         *(p++)=comp->id;
 892                         }
 893 #endif
 894                 *(p++)=0; /* Add the NULL method */
 895
 896 #ifndef OPENSSL_NO_TLSEXT
 897                 /* TLS extensions*/
 898                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 899                         {
 900                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 901                         goto err;
 902                         }
 903                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 904                         {
 905                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 906                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 907                         goto err;
 908                         }
 909 #endif
 910
 911                 l= p-d;
 912                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 913                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 914                 }
 915
 916         /* SSL3_ST_CW_CLNT_HELLO_B */
 917         return ssl_do_write(s);
 918 err:
 919         return(-1);
 920         }
 921
 922 int ssl3_get_server_hello(SSL *s)
 923         {
 924         STACK_OF(SSL_CIPHER) *sk;
 925         const SSL_CIPHER *c;
 926         CERT *ct = s->cert;
 927         unsigned char *p,*d;
 928         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 929         unsigned int j;
 930         long n;
 931 #ifndef OPENSSL_NO_COMP
 932         SSL_COMP *comp;
 933 #endif
 934         /* Hello verify request and/or server hello version may not
 935          * match so set first packet if we're negotiating version.
 936          */
 937         if (SSL_IS_DTLS(s))
 938                 s->first_packet = 1;
 939
 940         n=s->method->ssl_get_message(s,
 941                 SSL3_ST_CR_SRVR_HELLO_A,
 942                 SSL3_ST_CR_SRVR_HELLO_B,
 943                 -1,
 944                 20000, /* ?? */
 945                 &ok);
 946
 947         if (!ok) return((int)n);
 948
 949         if (SSL_IS_DTLS(s))
 950                 {
 951                 s->first_packet = 0;
 952                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 953                         {
 954                         if ( s->d1->send_cookie == 0)
 955                                 {
 956                                 s->s3->tmp.reuse_message = 1;
 957                                 return 1;
 958                                 }
 959                         else /* already sent a cookie */
 960                                 {
 961                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 962                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 963                                 goto f_err;
 964                                 }
 965                         }
 966                 }
 967
 968         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 969                 {
 970                 al=SSL_AD_UNEXPECTED_MESSAGE;
 971                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 972                 goto f_err;
 973                 }
 974
 975         d=p=(unsigned char *)s->init_msg;
 976         if (s->method->version == DTLS_ANY_VERSION)
 977                 {
 978                 /* Work out correct protocol version to use */
 979                 int hversion = (p[0] << 8)|p[1];
 980                 int options = s->options;
 981                 if (hversion == DTLS1_2_VERSION
 982                         && !(options & SSL_OP_NO_DTLSv1_2))
 983                         s->method = DTLSv1_2_client_method();
 984                 else if (tls1_suiteb(s))
 985                         {
 986                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 987                         s->version = hversion;
 988                         al = SSL_AD_PROTOCOL_VERSION;
 989                         goto f_err;
 990                         }
 991                 else if (hversion == DTLS1_VERSION
 992                         && !(options & SSL_OP_NO_DTLSv1))
 993                         s->method = DTLSv1_client_method();
 994                 else
 995                         {
 996                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 997                         s->version = hversion;
 998                         al = SSL_AD_PROTOCOL_VERSION;
 999                         goto f_err;
1000                         }
1001                 s->version = s->client_version = s->method->version;
1002                 }
1003
1004         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
1005                 {
1006                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
1007                 s->version=(s->version&0xff00)|p[1];
1008                 al=SSL_AD_PROTOCOL_VERSION;
1009                 goto f_err;
1010                 }
1011         p+=2;
1012
1013         /* load the server hello data */
1014         /* load the server random */
1015         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
1016         p+=SSL3_RANDOM_SIZE;
1017
1018         /* get the session-id */
1019         j= *(p++);
1020
1021         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
1022                 {
1023                 al=SSL_AD_ILLEGAL_PARAMETER;
1024                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
1025                 goto f_err;
1026                 }
1027
1028 #ifndef OPENSSL_NO_TLSEXT
1029         /* check if we want to resume the session based on external pre-shared secret */
1030         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1031                 {
1032                 SSL_CIPHER *pref_cipher=NULL;
1033                 s->session->master_key_length=sizeof(s->session->master_key);
1034                 if (s->tls_session_secret_cb(s, s->session->master_key,
1035                                              &s->session->master_key_length,
1036                                              NULL, &pref_cipher,
1037                                              s->tls_session_secret_cb_arg))
1038                         {
1039                         s->session->cipher = pref_cipher ?
1040                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1041                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1042                         }
1043                 }
1044 #endif /* OPENSSL_NO_TLSEXT */
1045
1046         if (j != 0 && j == s->session->session_id_length
1047             && memcmp(p,s->session->session_id,j) == 0)
1048             {
1049             if(s->sid_ctx_length != s->session->sid_ctx_length
1050                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1051                 {
1052                 /* actually a client application bug */
1053                 al=SSL_AD_ILLEGAL_PARAMETER;
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1055                 goto f_err;
1056                 }
1057             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1058             s->hit=1;
1059             }
1060         else    /* a miss or crap from the other end */
1061                 {
1062                 /* If we were trying for session-id reuse, make a new
1063                  * SSL_SESSION so we don't stuff up other people */
1064                 s->hit=0;
1065                 if (s->session->session_id_length > 0)
1066                         {
1067                         if (!ssl_get_new_session(s,0))
1068                                 {
1069                                 goto f_err;
1070                                 }
1071                         }
1072                 s->session->session_id_length=j;
1073                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1074                 }
1075         p+=j;
1076         c=ssl_get_cipher_by_char(s,p);
1077         if (c == NULL)
1078                 {
1079                 /* unknown cipher */
1080                 al=SSL_AD_ILLEGAL_PARAMETER;
1081                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1082                 goto f_err;
1083                 }
1084         /* Set version disabled mask now we know version */
1085         if (!SSL_USE_TLS1_2_CIPHERS(s))
1086                 ct->mask_ssl = SSL_TLSV1_2;
1087         else
1088                 ct->mask_ssl = 0;
1089         /* If it is a disabled cipher we didn't send it in client hello,
1090          * so return an error.
1091          */
1092         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1093                 {
1094                 al=SSL_AD_ILLEGAL_PARAMETER;
1095                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1096                 goto f_err;
1097                 }
1098         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1099
1100         sk=ssl_get_ciphers_by_id(s);
1101         i=sk_SSL_CIPHER_find(sk,c);
1102         if (i < 0)
1103                 {
1104                 /* we did not say we would use this cipher */
1105                 al=SSL_AD_ILLEGAL_PARAMETER;
1106                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1107                 goto f_err;
1108                 }
1109
1110         /* Depending on the session caching (internal/external), the cipher
1111            and/or cipher_id values may not be set. Make sure that
1112            cipher_id is set and use it for comparison. */
1113         if (s->session->cipher)
1114                 s->session->cipher_id = s->session->cipher->id;
1115         if (s->hit && (s->session->cipher_id != c->id))
1116                 {
1117 /* Workaround is now obsolete */
1118 #if 0
1119                 if (!(s->options &
1120                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1121 #endif
1122                         {
1123                         al=SSL_AD_ILLEGAL_PARAMETER;
1124                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1125                         goto f_err;
1126                         }
1127                 }
1128         s->s3->tmp.new_cipher=c;
1129         /* Don't digest cached records if no sigalgs: we may need them for
1130          * client authentication.
1131          */
1132         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1133                 goto f_err;
1134         /* lets get the compression algorithm */
1135         /* COMPRESSION */
1136 #ifdef OPENSSL_NO_COMP
1137         if (*(p++) != 0)
1138                 {
1139                 al=SSL_AD_ILLEGAL_PARAMETER;
1140                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1141                 goto f_err;
1142                 }
1143         /* If compression is disabled we'd better not try to resume a session
1144          * using compression.
1145          */
1146         if (s->session->compress_meth != 0)
1147                 {
1148                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1149                 goto f_err;
1150                 }
1151 #else
1152         j= *(p++);
1153         if (s->hit && j != s->session->compress_meth)
1154                 {
1155                 al=SSL_AD_ILLEGAL_PARAMETER;
1156                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1157                 goto f_err;
1158                 }
1159         if (j == 0)
1160                 comp=NULL;
1161         else if (!ssl_allow_compression(s))
1162                 {
1163                 al=SSL_AD_ILLEGAL_PARAMETER;
1164                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1165                 goto f_err;
1166                 }
1167         else
1168                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1169
1170         if ((j != 0) && (comp == NULL))
1171                 {
1172                 al=SSL_AD_ILLEGAL_PARAMETER;
1173                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1174                 goto f_err;
1175                 }
1176         else
1177                 {
1178                 s->s3->tmp.new_compression=comp;
1179                 }
1180 #endif
1181
1182 #ifndef OPENSSL_NO_TLSEXT
1183         /* TLS extensions*/
1184         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1185                 {
1186                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1187                 goto err;
1188                 }
1189 #endif
1190
1191         if (p != (d+n))
1192                 {
1193                 /* wrong packet length */
1194                 al=SSL_AD_DECODE_ERROR;
1195                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1196                 goto f_err;
1197                 }
1198
1199         return(1);
1200 f_err:
1201         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1202 err:
1203         return(-1);
1204         }
1205
1206 int ssl3_get_server_certificate(SSL *s)
1207         {
1208         int al,i,ok,ret= -1;
1209         unsigned long n,nc,llen,l;
1210         X509 *x=NULL;
1211         const unsigned char *q,*p;
1212         unsigned char *d;
1213         STACK_OF(X509) *sk=NULL;
1214         SESS_CERT *sc;
1215         EVP_PKEY *pkey=NULL;
1216         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1217
1218         n=s->method->ssl_get_message(s,
1219                 SSL3_ST_CR_CERT_A,
1220                 SSL3_ST_CR_CERT_B,
1221                 -1,
1222                 s->max_cert_list,
1223                 &ok);
1224
1225         if (!ok) return((int)n);
1226
1227         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1228                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1229                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1230                 {
1231                 s->s3->tmp.reuse_message=1;
1232                 return(1);
1233                 }
1234
1235         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1236                 {
1237                 al=SSL_AD_UNEXPECTED_MESSAGE;
1238                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1239                 goto f_err;
1240                 }
1241         p=d=(unsigned char *)s->init_msg;
1242
1243         if ((sk=sk_X509_new_null()) == NULL)
1244                 {
1245                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1246                 goto err;
1247                 }
1248
1249         n2l3(p,llen);
1250         if (llen+3 != n)
1251                 {
1252                 al=SSL_AD_DECODE_ERROR;
1253                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1254                 goto f_err;
1255                 }
1256         for (nc=0; nc<llen; )
1257                 {
1258                 n2l3(p,l);
1259                 if ((l+nc+3) > llen)
1260                         {
1261                         al=SSL_AD_DECODE_ERROR;
1262                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1263                         goto f_err;
1264                         }
1265
1266                 q=p;
1267                 x=d2i_X509(NULL,&q,l);
1268                 if (x == NULL)
1269                         {
1270                         al=SSL_AD_BAD_CERTIFICATE;
1271                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1272                         goto f_err;
1273                         }
1274                 if (q != (p+l))
1275                         {
1276                         al=SSL_AD_DECODE_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1278                         goto f_err;
1279                         }
1280                 if (!sk_X509_push(sk,x))
1281                         {
1282                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1283                         goto err;
1284                         }
1285                 x=NULL;
1286                 nc+=l+3;
1287                 p=q;
1288                 }
1289
1290         i=ssl_verify_cert_chain(s,sk);
1291         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1292 #ifndef OPENSSL_NO_KRB5
1293             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1294                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1295 #endif /* OPENSSL_NO_KRB5 */
1296                 )
1297                 {
1298                 al=ssl_verify_alarm_type(s->verify_result);
1299                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1300                 goto f_err;
1301                 }
1302         ERR_clear_error(); /* but we keep s->verify_result */
1303         if (i > 1)
1304                 {
1305                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1306                 al = SSL_AD_HANDSHAKE_FAILURE;
1307                 goto f_err;
1308                 }
1309
1310         sc=ssl_sess_cert_new();
1311         if (sc == NULL) goto err;
1312
1313         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1314         s->session->sess_cert=sc;
1315
1316         sc->cert_chain=sk;
1317         /* Inconsistency alert: cert_chain does include the peer's
1318          * certificate, which we don't include in s3_srvr.c */
1319         x=sk_X509_value(sk,0);
1320         sk=NULL;
1321         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1322
1323         pkey=X509_get_pubkey(x);
1324
1325         /* VRS: allow null cert if auth == KRB5 */
1326         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1327                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1328                     ? 0 : 1;
1329
1330 #ifdef KSSL_DEBUG
1331         printf("pkey,x = %p, %p\n", pkey,x);
1332         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1333         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1334                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1335 #endif    /* KSSL_DEBUG */
1336
1337         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1338                 {
1339                 x=NULL;
1340                 al=SSL3_AL_FATAL;
1341                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1342                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1343                 goto f_err;
1344                 }
1345
1346         i=ssl_cert_type(x,pkey);
1347         if (need_cert && i < 0)
1348                 {
1349                 x=NULL;
1350                 al=SSL3_AL_FATAL;
1351                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1352                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1353                 goto f_err;
1354                 }
1355
1356         if (need_cert)
1357                 {
1358                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1359                 if (exp_idx >= 0 && i != exp_idx)
1360                         {
1361                         x=NULL;
1362                         al=SSL_AD_ILLEGAL_PARAMETER;
1363                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1364                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1365                         goto f_err;
1366                         }
1367                 sc->peer_cert_type=i;
1368                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1369                 /* Why would the following ever happen?
1370                  * We just created sc a couple of lines ago. */
1371                 if (sc->peer_pkeys[i].x509 != NULL)
1372                         X509_free(sc->peer_pkeys[i].x509);
1373                 sc->peer_pkeys[i].x509=x;
1374                 sc->peer_key= &(sc->peer_pkeys[i]);
1375
1376                 if (s->session->peer != NULL)
1377                         X509_free(s->session->peer);
1378                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1379                 s->session->peer=x;
1380                 }
1381         else
1382                 {
1383                 sc->peer_cert_type=i;
1384                 sc->peer_key= NULL;
1385
1386                 if (s->session->peer != NULL)
1387                         X509_free(s->session->peer);
1388                 s->session->peer=NULL;
1389                 }
1390         s->session->verify_result = s->verify_result;
1391
1392         x=NULL;
1393         ret=1;
1394         if (0)
1395                 {
1396 f_err:
1397                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1398                 }
1399 err:
1400         EVP_PKEY_free(pkey);
1401         X509_free(x);
1402         sk_X509_pop_free(sk,X509_free);
1403         return(ret);
1404         }
1405
1406 int ssl3_get_key_exchange(SSL *s)
1407         {
1408 #ifndef OPENSSL_NO_RSA
1409         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1410 #endif
1411         EVP_MD_CTX md_ctx;
1412         unsigned char *param,*p;
1413         int al,i,j,param_len,ok;
1414         long n,alg_k,alg_a;
1415         EVP_PKEY *pkey=NULL;
1416         const EVP_MD *md = NULL;
1417 #ifndef OPENSSL_NO_RSA
1418         RSA *rsa=NULL;
1419 #endif
1420 #ifndef OPENSSL_NO_DH
1421         DH *dh=NULL;
1422 #endif
1423 #ifndef OPENSSL_NO_ECDH
1424         EC_KEY *ecdh = NULL;
1425         BN_CTX *bn_ctx = NULL;
1426         EC_POINT *srvr_ecpoint = NULL;
1427         int curve_nid = 0;
1428         int encoded_pt_len = 0;
1429 #endif
1430
1431         /* use same message size as in ssl3_get_certificate_request()
1432          * as ServerKeyExchange message may be skipped */
1433         n=s->method->ssl_get_message(s,
1434                 SSL3_ST_CR_KEY_EXCH_A,
1435                 SSL3_ST_CR_KEY_EXCH_B,
1436                 -1,
1437                 s->max_cert_list,
1438                 &ok);
1439         if (!ok) return((int)n);
1440
1441         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1442                 {
1443 #ifndef OPENSSL_NO_PSK
1444                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1445                    omitted if no identity hint is sent. Set
1446                    session->sess_cert anyway to avoid problems
1447                    later.*/
1448                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1449                         {
1450                         s->session->sess_cert=ssl_sess_cert_new();
1451                         if (s->ctx->psk_identity_hint)
1452                                 OPENSSL_free(s->ctx->psk_identity_hint);
1453                         s->ctx->psk_identity_hint = NULL;
1454                         }
1455 #endif
1456                 s->s3->tmp.reuse_message=1;
1457                 return(1);
1458                 }
1459
1460         param=p=(unsigned char *)s->init_msg;
1461         if (s->session->sess_cert != NULL)
1462                 {
1463 #ifndef OPENSSL_NO_RSA
1464                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1465                         {
1466                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1467                         s->session->sess_cert->peer_rsa_tmp=NULL;
1468                         }
1469 #endif
1470 #ifndef OPENSSL_NO_DH
1471                 if (s->session->sess_cert->peer_dh_tmp)
1472                         {
1473                         DH_free(s->session->sess_cert->peer_dh_tmp);
1474                         s->session->sess_cert->peer_dh_tmp=NULL;
1475                         }
1476 #endif
1477 #ifndef OPENSSL_NO_ECDH
1478                 if (s->session->sess_cert->peer_ecdh_tmp)
1479                         {
1480                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1481                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1482                         }
1483 #endif
1484                 }
1485         else
1486                 {
1487                 s->session->sess_cert=ssl_sess_cert_new();
1488                 }
1489
1490         param_len=0;
1491         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1492         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1493         EVP_MD_CTX_init(&md_ctx);
1494
1495 #ifndef OPENSSL_NO_PSK
1496         if (alg_k & SSL_kPSK)
1497                 {
1498                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1499
1500                 al=SSL_AD_HANDSHAKE_FAILURE;
1501                 n2s(p,i);
1502                 param_len=i+2;
1503                 /* Store PSK identity hint for later use, hint is used
1504                  * in ssl3_send_client_key_exchange.  Assume that the
1505                  * maximum length of a PSK identity hint can be as
1506                  * long as the maximum length of a PSK identity. */
1507                 if (i > PSK_MAX_IDENTITY_LEN)
1508                         {
1509                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1510                                 SSL_R_DATA_LENGTH_TOO_LONG);
1511                         goto f_err;
1512                         }
1513                 if (param_len > n)
1514                         {
1515                         al=SSL_AD_DECODE_ERROR;
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1517                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1518                         goto f_err;
1519                         }
1520                 /* If received PSK identity hint contains NULL
1521                  * characters, the hint is truncated from the first
1522                  * NULL. p may not be ending with NULL, so create a
1523                  * NULL-terminated string. */
1524                 memcpy(tmp_id_hint, p, i);
1525                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1526                 if (s->ctx->psk_identity_hint != NULL)
1527                         OPENSSL_free(s->ctx->psk_identity_hint);
1528                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1529                 if (s->ctx->psk_identity_hint == NULL)
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1532                         goto f_err;
1533                         }
1534
1535                 p+=i;
1536                 n-=param_len;
1537                 }
1538         else
1539 #endif /* !OPENSSL_NO_PSK */
1540 #ifndef OPENSSL_NO_SRP
1541         if (alg_k & SSL_kSRP)
1542                 {
1543                 n2s(p,i);
1544                 param_len=i+2;
1545                 if (param_len > n)
1546                         {
1547                         al=SSL_AD_DECODE_ERROR;
1548                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1549                         goto f_err;
1550                         }
1551                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1552                         {
1553                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1554                         goto err;
1555                         }
1556                 p+=i;
1557
1558                 n2s(p,i);
1559                 param_len+=i+2;
1560                 if (param_len > n)
1561                         {
1562                         al=SSL_AD_DECODE_ERROR;
1563                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1564                         goto f_err;
1565                         }
1566                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1567                         {
1568                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1569                         goto err;
1570                         }
1571                 p+=i;
1572
1573                 i = (unsigned int)(p[0]);
1574                 p++;
1575                 param_len+=i+1;
1576                 if (param_len > n)
1577                         {
1578                         al=SSL_AD_DECODE_ERROR;
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1580                         goto f_err;
1581                         }
1582                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1583                         {
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1585                         goto err;
1586                         }
1587                 p+=i;
1588
1589                 n2s(p,i);
1590                 param_len+=i+2;
1591                 if (param_len > n)
1592                         {
1593                         al=SSL_AD_DECODE_ERROR;
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1595                         goto f_err;
1596                         }
1597                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1598                         {
1599                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1600                         goto err;
1601                         }
1602                 p+=i;
1603                 n-=param_len;
1604
1605 /* We must check if there is a certificate */
1606 #ifndef OPENSSL_NO_RSA
1607                 if (alg_a & SSL_aRSA)
1608                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1609 #else
1610                 if (0)
1611                         ;
1612 #endif
1613 #ifndef OPENSSL_NO_DSA
1614                 else if (alg_a & SSL_aDSS)
1615                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1616 #endif
1617                 }
1618         else
1619 #endif /* !OPENSSL_NO_SRP */
1620 #ifndef OPENSSL_NO_RSA
1621         if (alg_k & SSL_kRSA)
1622                 {
1623                 if ((rsa=RSA_new()) == NULL)
1624                         {
1625                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1626                         goto err;
1627                         }
1628                 n2s(p,i);
1629                 param_len=i+2;
1630                 if (param_len > n)
1631                         {
1632                         al=SSL_AD_DECODE_ERROR;
1633                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1634                         goto f_err;
1635                         }
1636                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1637                         {
1638                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1639                         goto err;
1640                         }
1641                 p+=i;
1642
1643                 n2s(p,i);
1644                 param_len+=i+2;
1645                 if (param_len > n)
1646                         {
1647                         al=SSL_AD_DECODE_ERROR;
1648                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1649                         goto f_err;
1650                         }
1651                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1652                         {
1653                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1654                         goto err;
1655                         }
1656                 p+=i;
1657                 n-=param_len;
1658
1659                 /* this should be because we are using an export cipher */
1660                 if (alg_a & SSL_aRSA)
1661                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1662                 else
1663                         {
1664                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1665                         goto err;
1666                         }
1667                 s->session->sess_cert->peer_rsa_tmp=rsa;
1668                 rsa=NULL;
1669                 }
1670 #else /* OPENSSL_NO_RSA */
1671         if (0)
1672                 ;
1673 #endif
1674 #ifndef OPENSSL_NO_DH
1675         else if (alg_k & SSL_kDHE)
1676                 {
1677                 if ((dh=DH_new()) == NULL)
1678                         {
1679                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1680                         goto err;
1681                         }
1682                 n2s(p,i);
1683                 param_len=i+2;
1684                 if (param_len > n)
1685                         {
1686                         al=SSL_AD_DECODE_ERROR;
1687                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1688                         goto f_err;
1689                         }
1690                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1693                         goto err;
1694                         }
1695                 p+=i;
1696
1697                 n2s(p,i);
1698                 param_len+=i+2;
1699                 if (param_len > n)
1700                         {
1701                         al=SSL_AD_DECODE_ERROR;
1702                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1703                         goto f_err;
1704                         }
1705                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1708                         goto err;
1709                         }
1710                 p+=i;
1711
1712                 n2s(p,i);
1713                 param_len+=i+2;
1714                 if (param_len > n)
1715                         {
1716                         al=SSL_AD_DECODE_ERROR;
1717                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1718                         goto f_err;
1719                         }
1720                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1723                         goto err;
1724                         }
1725                 p+=i;
1726                 n-=param_len;
1727
1728                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1729                                                 DH_security_bits(dh), 0, dh))
1730                         {
1731                         al=SSL_AD_HANDSHAKE_FAILURE;
1732                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1733                         goto f_err;
1734                         }
1735
1736 #ifndef OPENSSL_NO_RSA
1737                 if (alg_a & SSL_aRSA)
1738                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1739 #else
1740                 if (0)
1741                         ;
1742 #endif
1743 #ifndef OPENSSL_NO_DSA
1744                 else if (alg_a & SSL_aDSS)
1745                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1746 #endif
1747                 /* else anonymous DH, so no certificate or pkey. */
1748
1749                 s->session->sess_cert->peer_dh_tmp=dh;
1750                 dh=NULL;
1751                 }
1752         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1753                 {
1754                 al=SSL_AD_ILLEGAL_PARAMETER;
1755                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1756                 goto f_err;
1757                 }
1758 #endif /* !OPENSSL_NO_DH */
1759
1760 #ifndef OPENSSL_NO_ECDH
1761         else if (alg_k & SSL_kECDHE)
1762                 {
1763                 EC_GROUP *ngroup;
1764                 const EC_GROUP *group;
1765
1766                 if ((ecdh=EC_KEY_new()) == NULL)
1767                         {
1768                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1769                         goto err;
1770                         }
1771
1772                 /* Extract elliptic curve parameters and the
1773                  * server's ephemeral ECDH public key.
1774                  * Keep accumulating lengths of various components in
1775                  * param_len and make sure it never exceeds n.
1776                  */
1777
1778                 /* XXX: For now we only support named (not generic) curves
1779                  * and the ECParameters in this case is just three bytes.
1780                  */
1781                 param_len=3;
1782                 /* Check curve is one of our preferences, if not server has
1783                  * sent an invalid curve.
1784                  */
1785                 if (!tls1_check_curve(s, p, param_len))
1786                         {
1787                         al=SSL_AD_DECODE_ERROR;
1788                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1789                         goto f_err;
1790                         }
1791
1792                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1793                         {
1794                         al=SSL_AD_INTERNAL_ERROR;
1795                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1796                         goto f_err;
1797                         }
1798
1799                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1800                 if (ngroup == NULL)
1801                         {
1802                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1803                         goto err;
1804                         }
1805                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1806                         {
1807                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1808                         goto err;
1809                         }
1810                 EC_GROUP_free(ngroup);
1811
1812                 group = EC_KEY_get0_group(ecdh);
1813
1814                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1815                     (EC_GROUP_get_degree(group) > 163))
1816                         {
1817                         al=SSL_AD_EXPORT_RESTRICTION;
1818                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1819                         goto f_err;
1820                         }
1821
1822                 p+=3;
1823
1824                 /* Next, get the encoded ECPoint */
1825                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1826                     ((bn_ctx = BN_CTX_new()) == NULL))
1827                         {
1828                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1829                         goto err;
1830                         }
1831
1832                 encoded_pt_len = *p;  /* length of encoded point */
1833                 p+=1;
1834                 param_len += (1 + encoded_pt_len);
1835                 if ((param_len > n) ||
1836                     (EC_POINT_oct2point(group, srvr_ecpoint,
1837                         p, encoded_pt_len, bn_ctx) == 0))
1838                         {
1839                         al=SSL_AD_DECODE_ERROR;
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1841                         goto f_err;
1842                         }
1843
1844                 n-=param_len;
1845                 p+=encoded_pt_len;
1846
1847                 /* The ECC/TLS specification does not mention
1848                  * the use of DSA to sign ECParameters in the server
1849                  * key exchange message. We do support RSA and ECDSA.
1850                  */
1851                 if (0) ;
1852 #ifndef OPENSSL_NO_RSA
1853                 else if (alg_a & SSL_aRSA)
1854                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1855 #endif
1856 #ifndef OPENSSL_NO_ECDSA
1857                 else if (alg_a & SSL_aECDSA)
1858                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1859 #endif
1860                 /* else anonymous ECDH, so no certificate or pkey. */
1861                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1862                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1863                 ecdh=NULL;
1864                 BN_CTX_free(bn_ctx);
1865                 bn_ctx = NULL;
1866                 EC_POINT_free(srvr_ecpoint);
1867                 srvr_ecpoint = NULL;
1868                 }
1869         else if (alg_k)
1870                 {
1871                 al=SSL_AD_UNEXPECTED_MESSAGE;
1872                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1873                 goto f_err;
1874                 }
1875 #endif /* !OPENSSL_NO_ECDH */
1876
1877
1878         /* p points to the next byte, there are 'n' bytes left */
1879
1880         /* if it was signed, check the signature */
1881         if (pkey != NULL)
1882                 {
1883                 if (SSL_USE_SIGALGS(s))
1884                         {
1885                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1886                         if (rv == -1)
1887                                 goto err;
1888                         else if (rv == 0)
1889                                 {
1890                                 al = SSL_AD_DECODE_ERROR;
1891                                 goto f_err;
1892                                 }
1893 #ifdef SSL_DEBUG
1894 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1895 #endif
1896                         p += 2;
1897                         n -= 2;
1898                         }
1899                 else
1900                         md = EVP_sha1();
1901
1902                 n2s(p,i);
1903                 n-=2;
1904                 j=EVP_PKEY_size(pkey);
1905
1906                 if ((i != n) || (n > j) || (n <= 0))
1907                         {
1908                         /* wrong packet length */
1909                         al=SSL_AD_DECODE_ERROR;
1910                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1911                         goto f_err;
1912                         }
1913
1914 #ifndef OPENSSL_NO_RSA
1915                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1916                         {
1917                         int num;
1918
1919                         j=0;
1920                         q=md_buf;
1921                         for (num=2; num > 0; num--)
1922                                 {
1923                                 EVP_MD_CTX_set_flags(&md_ctx,
1924                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1925                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1926                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1927                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1928                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1929                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1930                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1931                                 q+=i;
1932                                 j+=i;
1933                                 }
1934                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1935                                                                 pkey->pkey.rsa);
1936                         if (i < 0)
1937                                 {
1938                                 al=SSL_AD_DECRYPT_ERROR;
1939                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1940                                 goto f_err;
1941                                 }
1942                         if (i == 0)
1943                                 {
1944                                 /* bad signature */
1945                                 al=SSL_AD_DECRYPT_ERROR;
1946                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1947                                 goto f_err;
1948                                 }
1949                         }
1950                 else
1951 #endif
1952                         {
1953                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1954                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1955                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1956                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1957                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1958                                 {
1959                                 /* bad signature */
1960                                 al=SSL_AD_DECRYPT_ERROR;
1961                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1962                                 goto f_err;
1963                                 }
1964                         }
1965                 }
1966         else
1967                 {
1968                 /* aNULL or kPSK do not need public keys */
1969                 if (!(alg_a & SSL_aNULL) && !(alg_k & SSL_kPSK))
1970                         {
1971                         /* Might be wrong key type, check it */
1972                         if (ssl3_check_cert_and_algorithm(s))
1973                                 /* Otherwise this shouldn't happen */
1974                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1975                         goto err;
1976                         }
1977                 /* still data left over */
1978                 if (n != 0)
1979                         {
1980                         al=SSL_AD_DECODE_ERROR;
1981                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1982                         goto f_err;
1983                         }
1984                 }
1985         EVP_PKEY_free(pkey);
1986         EVP_MD_CTX_cleanup(&md_ctx);
1987         return(1);
1988 f_err:
1989         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1990 err:
1991         EVP_PKEY_free(pkey);
1992 #ifndef OPENSSL_NO_RSA
1993         if (rsa != NULL)
1994                 RSA_free(rsa);
1995 #endif
1996 #ifndef OPENSSL_NO_DH
1997         if (dh != NULL)
1998                 DH_free(dh);
1999 #endif
2000 #ifndef OPENSSL_NO_ECDH
2001         BN_CTX_free(bn_ctx);
2002         EC_POINT_free(srvr_ecpoint);
2003         if (ecdh != NULL)
2004                 EC_KEY_free(ecdh);
2005 #endif
2006         EVP_MD_CTX_cleanup(&md_ctx);
2007         return(-1);
2008         }
2009
2010 int ssl3_get_certificate_request(SSL *s)
2011         {
2012         int ok,ret=0;
2013         unsigned long n,nc,l;
2014         unsigned int llen, ctype_num,i;
2015         X509_NAME *xn=NULL;
2016         const unsigned char *p,*q;
2017         unsigned char *d;
2018         STACK_OF(X509_NAME) *ca_sk=NULL;
2019
2020         n=s->method->ssl_get_message(s,
2021                 SSL3_ST_CR_CERT_REQ_A,
2022                 SSL3_ST_CR_CERT_REQ_B,
2023                 -1,
2024                 s->max_cert_list,
2025                 &ok);
2026
2027         if (!ok) return((int)n);
2028
2029         s->s3->tmp.cert_req=0;
2030
2031         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2032                 {
2033                 s->s3->tmp.reuse_message=1;
2034                 /* If we get here we don't need any cached handshake records
2035                  * as we wont be doing client auth.
2036                  */
2037                 if (s->s3->handshake_buffer)
2038                         {
2039                         if (!ssl3_digest_cached_records(s))
2040                                 goto err;
2041                         }
2042                 return(1);
2043                 }
2044
2045         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2046                 {
2047                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2048                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2049                 goto err;
2050                 }
2051
2052         /* TLS does not like anon-DH with client cert */
2053         if (s->version > SSL3_VERSION)
2054                 {
2055                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2056                         {
2057                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2058                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2059                         goto err;
2060                         }
2061                 }
2062
2063         p=d=(unsigned char *)s->init_msg;
2064
2065         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2066                 {
2067                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2068                 goto err;
2069                 }
2070
2071         /* get the certificate types */
2072         ctype_num= *(p++);
2073         if (s->cert->ctypes)
2074                 {
2075                 OPENSSL_free(s->cert->ctypes);
2076                 s->cert->ctypes = NULL;
2077                 }
2078         if (ctype_num > SSL3_CT_NUMBER)
2079                 {
2080                 /* If we exceed static buffer copy all to cert structure */
2081                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2082                 memcpy(s->cert->ctypes, p, ctype_num);
2083                 s->cert->ctype_num = (size_t)ctype_num;
2084                 ctype_num=SSL3_CT_NUMBER;
2085                 }
2086         for (i=0; i<ctype_num; i++)
2087                 s->s3->tmp.ctype[i]= p[i];
2088         p+=p[-1];
2089         if (SSL_USE_SIGALGS(s))
2090                 {
2091                 n2s(p, llen);
2092                 /* Check we have enough room for signature algorithms and
2093                  * following length value.
2094                  */
2095                 if ((unsigned long)(p - d + llen + 2) > n)
2096                         {
2097                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2098                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2099                         goto err;
2100                         }
2101                 /* Clear certificate digests and validity flags */
2102                 for (i = 0; i < SSL_PKEY_NUM; i++)
2103                         {
2104                         s->cert->pkeys[i].digest = NULL;
2105                         s->cert->pkeys[i].valid_flags = 0;
2106                         }
2107                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2108                         {
2109                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2110                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2111                         goto err;
2112                         }
2113                 p += llen;
2114                 }
2115
2116         /* get the CA RDNs */
2117         n2s(p,llen);
2118 #if 0
2119 {
2120 FILE *out;
2121 out=fopen("/tmp/vsign.der","w");
2122 fwrite(p,1,llen,out);
2123 fclose(out);
2124 }
2125 #endif
2126
2127         if ((unsigned long)(p - d + llen) != n)
2128                 {
2129                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2130                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2131                 goto err;
2132                 }
2133
2134         for (nc=0; nc<llen; )
2135                 {
2136                 n2s(p,l);
2137                 if ((l+nc+2) > llen)
2138                         {
2139                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2140                                 goto cont; /* netscape bugs */
2141                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2142                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2143                         goto err;
2144                         }
2145
2146                 q=p;
2147
2148                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2149                         {
2150                         /* If netscape tolerance is on, ignore errors */
2151                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2152                                 goto cont;
2153                         else
2154                                 {
2155                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2156                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2157                                 goto err;
2158                                 }
2159                         }
2160
2161                 if (q != (p+l))
2162                         {
2163                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2164                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2165                         goto err;
2166                         }
2167                 if (!sk_X509_NAME_push(ca_sk,xn))
2168                         {
2169                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2170                         goto err;
2171                         }
2172
2173                 p+=l;
2174                 nc+=l+2;
2175                 }
2176
2177         if (0)
2178                 {
2179 cont:
2180                 ERR_clear_error();
2181                 }
2182
2183         /* we should setup a certificate to return.... */
2184         s->s3->tmp.cert_req=1;
2185         s->s3->tmp.ctype_num=ctype_num;
2186         if (s->s3->tmp.ca_names != NULL)
2187                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2188         s->s3->tmp.ca_names=ca_sk;
2189         ca_sk=NULL;
2190
2191         ret=1;
2192 err:
2193         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2194         return(ret);
2195         }
2196
2197 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2198         {
2199         return(X509_NAME_cmp(*a,*b));
2200         }
2201 #ifndef OPENSSL_NO_TLSEXT
2202 int ssl3_get_new_session_ticket(SSL *s)
2203         {
2204         int ok,al,ret=0, ticklen;
2205         long n;
2206         const unsigned char *p;
2207         unsigned char *d;
2208
2209         n=s->method->ssl_get_message(s,
2210                 SSL3_ST_CR_SESSION_TICKET_A,
2211                 SSL3_ST_CR_SESSION_TICKET_B,
2212                 -1,
2213                 16384,
2214                 &ok);
2215
2216         if (!ok)
2217                 return((int)n);
2218
2219         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2220                 {
2221                 s->s3->tmp.reuse_message=1;
2222                 return(1);
2223                 }
2224         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2225                 {
2226                 al=SSL_AD_UNEXPECTED_MESSAGE;
2227                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2228                 goto f_err;
2229                 }
2230         if (n < 6)
2231                 {
2232                 /* need at least ticket_lifetime_hint + ticket length */
2233                 al = SSL_AD_DECODE_ERROR;
2234                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2235                 goto f_err;
2236                 }
2237
2238         p=d=(unsigned char *)s->init_msg;
2239         n2l(p, s->session->tlsext_tick_lifetime_hint);
2240         n2s(p, ticklen);
2241         /* ticket_lifetime_hint + ticket_length + ticket */
2242         if (ticklen + 6 != n)
2243                 {
2244                 al = SSL_AD_DECODE_ERROR;
2245                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2246                 goto f_err;
2247                 }
2248         if (s->session->tlsext_tick)
2249                 {
2250                 OPENSSL_free(s->session->tlsext_tick);
2251                 s->session->tlsext_ticklen = 0;
2252                 }
2253         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2254         if (!s->session->tlsext_tick)
2255                 {
2256                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2257                 goto err;
2258                 }
2259         memcpy(s->session->tlsext_tick, p, ticklen);
2260         s->session->tlsext_ticklen = ticklen;
2261         /* There are two ways to detect a resumed ticket sesion.
2262          * One is to set an appropriate session ID and then the server
2263          * must return a match in ServerHello. This allows the normal
2264          * client session ID matching to work and we know much
2265          * earlier that the ticket has been accepted.
2266          *
2267          * The other way is to set zero length session ID when the
2268          * ticket is presented and rely on the handshake to determine
2269          * session resumption.
2270          *
2271          * We choose the former approach because this fits in with
2272          * assumptions elsewhere in OpenSSL. The session ID is set
2273          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2274          * ticket.
2275          */
2276         EVP_Digest(p, ticklen,
2277                         s->session->session_id, &s->session->session_id_length,
2278 #ifndef OPENSSL_NO_SHA256
2279                                                         EVP_sha256(), NULL);
2280 #else
2281                                                         EVP_sha1(), NULL);
2282 #endif
2283         ret=1;
2284         return(ret);
2285 f_err:
2286         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2287 err:
2288         return(-1);
2289         }
2290
2291 int ssl3_get_cert_status(SSL *s)
2292         {
2293         int ok, al;
2294         unsigned long resplen,n;
2295         const unsigned char *p;
2296
2297         n=s->method->ssl_get_message(s,
2298                 SSL3_ST_CR_CERT_STATUS_A,
2299                 SSL3_ST_CR_CERT_STATUS_B,
2300                 SSL3_MT_CERTIFICATE_STATUS,
2301                 16384,
2302                 &ok);
2303
2304         if (!ok) return((int)n);
2305         if (n < 4)
2306                 {
2307                 /* need at least status type + length */
2308                 al = SSL_AD_DECODE_ERROR;
2309                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2310                 goto f_err;
2311                 }
2312         p = (unsigned char *)s->init_msg;
2313         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2314                 {
2315                 al = SSL_AD_DECODE_ERROR;
2316                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2317                 goto f_err;
2318                 }
2319         n2l3(p, resplen);
2320         if (resplen + 4 != n)
2321                 {
2322                 al = SSL_AD_DECODE_ERROR;
2323                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2324                 goto f_err;
2325                 }
2326         if (s->tlsext_ocsp_resp)
2327                 OPENSSL_free(s->tlsext_ocsp_resp);
2328         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2329         if (!s->tlsext_ocsp_resp)
2330                 {
2331                 al = SSL_AD_INTERNAL_ERROR;
2332                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2333                 goto f_err;
2334                 }
2335         s->tlsext_ocsp_resplen = resplen;
2336         if (s->ctx->tlsext_status_cb)
2337                 {
2338                 int ret;
2339                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2340                 if (ret == 0)
2341                         {
2342                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2343                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2344                         goto f_err;
2345                         }
2346                 if (ret < 0)
2347                         {
2348                         al = SSL_AD_INTERNAL_ERROR;
2349                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2350                         goto f_err;
2351                         }
2352                 }
2353         return 1;
2354 f_err:
2355         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2356         return(-1);
2357         }
2358 #endif
2359
2360 int ssl3_get_server_done(SSL *s)
2361         {
2362         int ok,ret=0;
2363         long n;
2364
2365         n=s->method->ssl_get_message(s,
2366                 SSL3_ST_CR_SRVR_DONE_A,
2367                 SSL3_ST_CR_SRVR_DONE_B,
2368                 SSL3_MT_SERVER_DONE,
2369                 30, /* should be very small, like 0 :-) */
2370                 &ok);
2371
2372         if (!ok) return((int)n);
2373         if (n > 0)
2374                 {
2375                 /* should contain no data */
2376                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2377                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2378                 return -1;
2379                 }
2380         ret=1;
2381         return(ret);
2382         }
2383
2384
2385 int ssl3_send_client_key_exchange(SSL *s)
2386         {
2387         unsigned char *p;
2388         int n;
2389         unsigned long alg_k;
2390 #ifndef OPENSSL_NO_RSA
2391         unsigned char *q;
2392         EVP_PKEY *pkey=NULL;
2393 #endif
2394 #ifndef OPENSSL_NO_KRB5
2395         KSSL_ERR kssl_err;
2396 #endif /* OPENSSL_NO_KRB5 */
2397 #ifndef OPENSSL_NO_ECDH
2398         EC_KEY *clnt_ecdh = NULL;
2399         const EC_POINT *srvr_ecpoint = NULL;
2400         EVP_PKEY *srvr_pub_pkey = NULL;
2401         unsigned char *encodedPoint = NULL;
2402         int encoded_pt_len = 0;
2403         BN_CTX * bn_ctx = NULL;
2404 #endif
2405
2406         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2407                 {
2408                 p = ssl_handshake_start(s);
2409
2410                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2411
2412                 /* Fool emacs indentation */
2413                 if (0) {}
2414 #ifndef OPENSSL_NO_RSA
2415                 else if (alg_k & SSL_kRSA)
2416                         {
2417                         RSA *rsa;
2418                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2419
2420                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2421                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2422                         else
2423                                 {
2424                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2425                                 if ((pkey == NULL) ||
2426                                         (pkey->type != EVP_PKEY_RSA) ||
2427                                         (pkey->pkey.rsa == NULL))
2428                                         {
2429                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2430                                         goto err;
2431                                         }
2432                                 rsa=pkey->pkey.rsa;
2433                                 EVP_PKEY_free(pkey);
2434                                 }
2435
2436                         tmp_buf[0]=s->client_version>>8;
2437                         tmp_buf[1]=s->client_version&0xff;
2438                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2439                                         goto err;
2440
2441                         s->session->master_key_length=sizeof tmp_buf;
2442
2443                         q=p;
2444                         /* Fix buf for TLS and beyond */
2445                         if (s->version > SSL3_VERSION)
2446                                 p+=2;
2447                         n=RSA_public_encrypt(sizeof tmp_buf,
2448                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2449 #ifdef PKCS1_CHECK
2450                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2451                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2452 #endif
2453                         if (n <= 0)
2454                                 {
2455                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2456                                 goto err;
2457                                 }
2458
2459                         /* Fix buf for TLS and beyond */
2460                         if (s->version > SSL3_VERSION)
2461                                 {
2462                                 s2n(n,q);
2463                                 n+=2;
2464                                 }
2465
2466                         s->session->master_key_length=
2467                                 s->method->ssl3_enc->generate_master_secret(s,
2468                                         s->session->master_key,
2469                                         tmp_buf,sizeof tmp_buf);
2470                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2471                         }
2472 #endif
2473 #ifndef OPENSSL_NO_KRB5
2474                 else if (alg_k & SSL_kKRB5)
2475                         {
2476                         krb5_error_code krb5rc;
2477                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2478                         /*  krb5_data   krb5_ap_req;  */
2479                         krb5_data       *enc_ticket;
2480                         krb5_data       authenticator, *authp = NULL;
2481                         EVP_CIPHER_CTX  ciph_ctx;
2482                         const EVP_CIPHER *enc = NULL;
2483                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2484                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2485                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2486                                                 + EVP_MAX_IV_LENGTH];
2487                         int             padl, outl = sizeof(epms);
2488
2489                         EVP_CIPHER_CTX_init(&ciph_ctx);
2490
2491 #ifdef KSSL_DEBUG
2492                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2493                                 alg_k, SSL_kKRB5);
2494 #endif  /* KSSL_DEBUG */
2495
2496                         authp = NULL;
2497 #ifdef KRB5SENDAUTH
2498                         if (KRB5SENDAUTH)  authp = &authenticator;
2499 #endif  /* KRB5SENDAUTH */
2500
2501                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2502                                 &kssl_err);
2503                         enc = kssl_map_enc(kssl_ctx->enctype);
2504                         if (enc == NULL)
2505                             goto err;
2506 #ifdef KSSL_DEBUG
2507                         {
2508                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2509                         if (krb5rc && kssl_err.text)
2510                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2511                         }
2512 #endif  /* KSSL_DEBUG */
2513
2514                         if (krb5rc)
2515                                 {
2516                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2517                                                 SSL_AD_HANDSHAKE_FAILURE);
2518                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2519                                                 kssl_err.reason);
2520                                 goto err;
2521                                 }
2522
2523                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2524                         **  in place of RFC 2712 KerberosWrapper, as in:
2525                         **
2526                         **  Send ticket (copy to *p, set n = length)
2527                         **  n = krb5_ap_req.length;
2528                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2529                         **  if (krb5_ap_req.data)
2530                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2531                         **
2532                         **  Now using real RFC 2712 KerberosWrapper
2533                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2534                         **  Note: 2712 "opaque" types are here replaced
2535                         **  with a 2-byte length followed by the value.
2536                         **  Example:
2537                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2538                         **  Where "xx xx" = length bytes.  Shown here with
2539                         **  optional authenticator omitted.
2540                         */
2541
2542                         /*  KerberosWrapper.Ticket              */
2543                         s2n(enc_ticket->length,p);
2544                         memcpy(p, enc_ticket->data, enc_ticket->length);
2545                         p+= enc_ticket->length;
2546                         n = enc_ticket->length + 2;
2547
2548                         /*  KerberosWrapper.Authenticator       */
2549                         if (authp  &&  authp->length)
2550                                 {
2551                                 s2n(authp->length,p);
2552                                 memcpy(p, authp->data, authp->length);
2553                                 p+= authp->length;
2554                                 n+= authp->length + 2;
2555
2556                                 free(authp->data);
2557                                 authp->data = NULL;
2558                                 authp->length = 0;
2559                                 }
2560                         else
2561                                 {
2562                                 s2n(0,p);/*  null authenticator length  */
2563                                 n+=2;
2564                                 }
2565
2566                             tmp_buf[0]=s->client_version>>8;
2567                             tmp_buf[1]=s->client_version&0xff;
2568                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2569                                 goto err;
2570
2571                         /*  20010420 VRS.  Tried it this way; failed.
2572                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2573                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2574                         **                              kssl_ctx->length);
2575                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2576                         */
2577
2578                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2579                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2580                                 kssl_ctx->key,iv);
2581                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2582                                 sizeof tmp_buf);
2583                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2584                         outl += padl;
2585                         if (outl > (int)sizeof epms)
2586                                 {
2587                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2588                                 goto err;
2589                                 }
2590                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2591
2592                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2593                         s2n(outl,p);
2594                         memcpy(p, epms, outl);
2595                         p+=outl;
2596                         n+=outl + 2;
2597
2598                         s->session->master_key_length=
2599                                 s->method->ssl3_enc->generate_master_secret(s,
2600                                         s->session->master_key,
2601                                         tmp_buf, sizeof tmp_buf);
2602
2603                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2604                         OPENSSL_cleanse(epms, outl);
2605                         }
2606 #endif
2607 #ifndef OPENSSL_NO_DH
2608                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2609                         {
2610                         DH *dh_srvr,*dh_clnt;
2611                         SESS_CERT *scert = s->session->sess_cert;
2612
2613                         if (scert == NULL)
2614                                 {
2615                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2616                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2617                                 goto err;
2618                                 }
2619
2620                         if (scert->peer_dh_tmp != NULL)
2621                                 dh_srvr=scert->peer_dh_tmp;
2622                         else
2623                                 {
2624                                 /* we get them from the cert */
2625                                 int idx = scert->peer_cert_type;
2626                                 EVP_PKEY *spkey = NULL;
2627                                 dh_srvr = NULL;
2628                                 if (idx >= 0)
2629                                         spkey = X509_get_pubkey(
2630                                                 scert->peer_pkeys[idx].x509);
2631                                 if (spkey)
2632                                         {
2633                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2634                                         EVP_PKEY_free(spkey);
2635                                         }
2636                                 if (dh_srvr == NULL)
2637                                         {
2638                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2639                                             ERR_R_INTERNAL_ERROR);
2640                                         goto err;
2641                                         }
2642                                 }
2643                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2644                                 {
2645                                 /* Use client certificate key */
2646                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2647                                 dh_clnt = NULL;
2648                                 if (clkey)
2649                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2650                                 if (dh_clnt == NULL)
2651                                         {
2652                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2653                                             ERR_R_INTERNAL_ERROR);
2654                                         goto err;
2655                                         }
2656                                 }
2657                         else
2658                                 {
2659                                 /* generate a new random key */
2660                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2661                                         {
2662                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2663                                         goto err;
2664                                         }
2665                                 if (!DH_generate_key(dh_clnt))
2666                                         {
2667                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2668                                         DH_free(dh_clnt);
2669                                         goto err;
2670                                         }
2671                                 }
2672
2673                         /* use the 'p' output buffer for the DH key, but
2674                          * make sure to clear it out afterwards */
2675
2676                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2677                         if (scert->peer_dh_tmp == NULL)
2678                                 DH_free(dh_srvr);
2679
2680                         if (n <= 0)
2681                                 {
2682                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2683                                 DH_free(dh_clnt);
2684                                 goto err;
2685                                 }
2686
2687                         /* generate master key from the result */
2688                         s->session->master_key_length=
2689                                 s->method->ssl3_enc->generate_master_secret(s,
2690                                         s->session->master_key,p,n);
2691                         /* clean up */
2692                         memset(p,0,n);
2693
2694                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2695                                 n = 0;
2696                         else
2697                                 {
2698                                 /* send off the data */
2699                                 n=BN_num_bytes(dh_clnt->pub_key);
2700                                 s2n(n,p);
2701                                 BN_bn2bin(dh_clnt->pub_key,p);
2702                                 n+=2;
2703                                 }
2704
2705                         DH_free(dh_clnt);
2706
2707                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2708                         }
2709 #endif
2710
2711 #ifndef OPENSSL_NO_ECDH
2712                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2713                         {
2714                         const EC_GROUP *srvr_group = NULL;
2715                         EC_KEY *tkey;
2716                         int ecdh_clnt_cert = 0;
2717                         int field_size = 0;
2718
2719                         if (s->session->sess_cert == NULL)
2720                                 {
2721                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2722                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2723                                 goto err;
2724                                 }
2725
2726                         /* Did we send out the client's
2727                          * ECDH share for use in premaster
2728                          * computation as part of client certificate?
2729                          * If so, set ecdh_clnt_cert to 1.
2730                          */
2731                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2732                                 {
2733                                 /* XXX: For now, we do not support client
2734                                  * authentication using ECDH certificates.
2735                                  * To add such support, one needs to add
2736                                  * code that checks for appropriate
2737                                  * conditions and sets ecdh_clnt_cert to 1.
2738                                  * For example, the cert have an ECC
2739                                  * key on the same curve as the server's
2740                                  * and the key should be authorized for
2741                                  * key agreement.
2742                                  *
2743                                  * One also needs to add code in ssl3_connect
2744                                  * to skip sending the certificate verify
2745                                  * message.
2746                                  *
2747                                  * if ((s->cert->key->privatekey != NULL) &&
2748                                  *     (s->cert->key->privatekey->type ==
2749                                  *      EVP_PKEY_EC) && ...)
2750                                  * ecdh_clnt_cert = 1;
2751                                  */
2752                                 }
2753
2754                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2755                                 {
2756                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2757                                 }
2758                         else
2759                                 {
2760                                 /* Get the Server Public Key from Cert */
2761                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2762                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2763                                 if ((srvr_pub_pkey == NULL) ||
2764                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2765                                     (srvr_pub_pkey->pkey.ec == NULL))
2766                                         {
2767                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2768                                             ERR_R_INTERNAL_ERROR);
2769                                         goto err;
2770                                         }
2771
2772                                 tkey = srvr_pub_pkey->pkey.ec;
2773                                 }
2774
2775                         srvr_group   = EC_KEY_get0_group(tkey);
2776                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2777
2778                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2779                                 {
2780                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2781                                     ERR_R_INTERNAL_ERROR);
2782                                 goto err;
2783                                 }
2784
2785                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2786                                 {
2787                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2788                                 goto err;
2789                                 }
2790
2791                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2794                                 goto err;
2795                                 }
2796                         if (ecdh_clnt_cert)
2797                                 {
2798                                 /* Reuse key info from our certificate
2799                                  * We only need our private key to perform
2800                                  * the ECDH computation.
2801                                  */
2802                                 const BIGNUM *priv_key;
2803                                 tkey = s->cert->key->privatekey->pkey.ec;
2804                                 priv_key = EC_KEY_get0_private_key(tkey);
2805                                 if (priv_key == NULL)
2806                                         {
2807                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2808                                         goto err;
2809                                         }
2810                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2811                                         {
2812                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2813                                         goto err;
2814                                         }
2815                                 }
2816                         else
2817                                 {
2818                                 /* Generate a new ECDH key pair */
2819                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2820                                         {
2821                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2822                                         goto err;
2823                                         }
2824                                 }
2825
2826                         /* use the 'p' output buffer for the ECDH key, but
2827                          * make sure to clear it out afterwards
2828                          */
2829
2830                         field_size = EC_GROUP_get_degree(srvr_group);
2831                         if (field_size <= 0)
2832                                 {
2833                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2834                                        ERR_R_ECDH_LIB);
2835                                 goto err;
2836                                 }
2837                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2838                         if (n <= 0)
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2841                                        ERR_R_ECDH_LIB);
2842                                 goto err;
2843                                 }
2844
2845                         /* generate master key from the result */
2846                         s->session->master_key_length = s->method->ssl3_enc \
2847                             -> generate_master_secret(s,
2848                                 s->session->master_key,
2849                                 p, n);
2850
2851                         memset(p, 0, n); /* clean up */
2852
2853                         if (ecdh_clnt_cert)
2854                                 {
2855                                 /* Send empty client key exch message */
2856                                 n = 0;
2857                                 }
2858                         else
2859                                 {
2860                                 /* First check the size of encoding and
2861                                  * allocate memory accordingly.
2862                                  */
2863                                 encoded_pt_len =
2864                                     EC_POINT_point2oct(srvr_group,
2865                                         EC_KEY_get0_public_key(clnt_ecdh),
2866                                         POINT_CONVERSION_UNCOMPRESSED,
2867                                         NULL, 0, NULL);
2868
2869                                 encodedPoint = (unsigned char *)
2870                                     OPENSSL_malloc(encoded_pt_len *
2871                                         sizeof(unsigned char));
2872                                 bn_ctx = BN_CTX_new();
2873                                 if ((encodedPoint == NULL) ||
2874                                     (bn_ctx == NULL))
2875                                         {
2876                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2877                                         goto err;
2878                                         }
2879
2880                                 /* Encode the public key */
2881                                 n = EC_POINT_point2oct(srvr_group,
2882                                     EC_KEY_get0_public_key(clnt_ecdh),
2883                                     POINT_CONVERSION_UNCOMPRESSED,
2884                                     encodedPoint, encoded_pt_len, bn_ctx);
2885
2886                                 *p = n; /* length of encoded point */
2887                                 /* Encoded point will be copied here */
2888                                 p += 1;
2889                                 /* copy the point */
2890                                 memcpy((unsigned char *)p, encodedPoint, n);
2891                                 /* increment n to account for length field */
2892                                 n += 1;
2893                                 }
2894
2895                         /* Free allocated memory */
2896                         BN_CTX_free(bn_ctx);
2897                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2898                         if (clnt_ecdh != NULL)
2899                                  EC_KEY_free(clnt_ecdh);
2900                         EVP_PKEY_free(srvr_pub_pkey);
2901                         }
2902 #endif /* !OPENSSL_NO_ECDH */
2903                 else if (alg_k & SSL_kGOST)
2904                         {
2905                         /* GOST key exchange message creation */
2906                         EVP_PKEY_CTX *pkey_ctx;
2907                         X509 *peer_cert;
2908                         size_t msglen;
2909                         unsigned int md_len;
2910                         int keytype;
2911                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2912                         EVP_MD_CTX *ukm_hash;
2913                         EVP_PKEY *pub_key;
2914
2915                         /* Get server sertificate PKEY and create ctx from it */
2916                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2917                         if (!peer_cert)
2918                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2919                         if (!peer_cert)         {
2920                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2921                                         goto err;
2922                                 }
2923
2924                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2925                         /* If we have send a certificate, and certificate key
2926
2927                          * parameters match those of server certificate, use
2928                          * certificate key for key exchange
2929                          */
2930
2931                          /* Otherwise, generate ephemeral key pair */
2932
2933                         EVP_PKEY_encrypt_init(pkey_ctx);
2934                           /* Generate session key */
2935                     RAND_bytes(premaster_secret,32);
2936                         /* If we have client certificate, use its secret as peer key */
2937                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2938                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2939                                         /* If there was an error - just ignore it. Ephemeral key
2940                                         * would be used
2941                                         */
2942                                         ERR_clear_error();
2943                                 }
2944                         }
2945                         /* Compute shared IV and store it in algorithm-specific
2946                          * context data */
2947                         ukm_hash = EVP_MD_CTX_create();
2948                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2949                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2950                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2951                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2952                         EVP_MD_CTX_destroy(ukm_hash);
2953                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2954                                 8,shared_ukm)<0) {
2955                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2956                                                 SSL_R_LIBRARY_BUG);
2957                                         goto err;
2958                                 }
2959                         /* Make GOST keytransport blob message */
2960                         /*Encapsulate it into sequence */
2961                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2962                         msglen=255;
2963                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2964                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2965                                         SSL_R_LIBRARY_BUG);
2966                                 goto err;
2967                         }
2968                         if (msglen >= 0x80)
2969                                 {
2970                                 *(p++)=0x81;
2971                                 *(p++)= msglen & 0xff;
2972                                 n=msglen+3;
2973                                 }
2974                         else
2975                                 {
2976                                 *(p++)= msglen & 0xff;
2977                                 n=msglen+2;
2978                                 }
2979                         memcpy(p, tmp, msglen);
2980                         /* Check if pubkey from client certificate was used */
2981                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2982                                 {
2983                                 /* Set flag "skip certificate verify" */
2984                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2985                                 }
2986                         EVP_PKEY_CTX_free(pkey_ctx);
2987                         s->session->master_key_length=
2988                                 s->method->ssl3_enc->generate_master_secret(s,
2989                                         s->session->master_key,premaster_secret,32);
2990                         EVP_PKEY_free(pub_key);
2991
2992                         }
2993 #ifndef OPENSSL_NO_SRP
2994                 else if (alg_k & SSL_kSRP)
2995                         {
2996                         if (s->srp_ctx.A != NULL)
2997                                 {
2998                                 /* send off the data */
2999                                 n=BN_num_bytes(s->srp_ctx.A);
3000                                 s2n(n,p);
3001                                 BN_bn2bin(s->srp_ctx.A,p);
3002                                 n+=2;
3003                                 }
3004                         else
3005                                 {
3006                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3007                                 goto err;
3008                                 }
3009                         if (s->session->srp_username != NULL)
3010                                 OPENSSL_free(s->session->srp_username);
3011                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3012                         if (s->session->srp_username == NULL)
3013                                 {
3014                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3015                                         ERR_R_MALLOC_FAILURE);
3016                                 goto err;
3017                                 }
3018
3019                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3020                                 {
3021                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3022                                 goto err;
3023                                 }
3024                         }
3025 #endif
3026 #ifndef OPENSSL_NO_PSK
3027                 else if (alg_k & SSL_kPSK)
3028                         {
3029                         char identity[PSK_MAX_IDENTITY_LEN];
3030                         unsigned char *t = NULL;
3031                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3032                         unsigned int pre_ms_len = 0, psk_len = 0;
3033                         int psk_err = 1;
3034
3035                         n = 0;
3036                         if (s->psk_client_callback == NULL)
3037                                 {
3038                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3039                                         SSL_R_PSK_NO_CLIENT_CB);
3040                                 goto err;
3041                                 }
3042
3043                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3044                                 identity, PSK_MAX_IDENTITY_LEN,
3045                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3046                         if (psk_len > PSK_MAX_PSK_LEN)
3047                                 {
3048                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3049                                         ERR_R_INTERNAL_ERROR);
3050                                 goto psk_err;
3051                                 }
3052                         else if (psk_len == 0)
3053                                 {
3054                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3055                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3056                                 goto psk_err;
3057                                 }
3058
3059                         /* create PSK pre_master_secret */
3060                         pre_ms_len = 2+psk_len+2+psk_len;
3061                         t = psk_or_pre_ms;
3062                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3063                         s2n(psk_len, t);
3064                         memset(t, 0, psk_len);
3065                         t+=psk_len;
3066                         s2n(psk_len, t);
3067
3068                         if (s->session->psk_identity_hint != NULL)
3069                                 OPENSSL_free(s->session->psk_identity_hint);
3070                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3071                         if (s->ctx->psk_identity_hint != NULL &&
3072                                 s->session->psk_identity_hint == NULL)
3073                                 {
3074                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3075                                         ERR_R_MALLOC_FAILURE);
3076                                 goto psk_err;
3077                                 }
3078
3079                         if (s->session->psk_identity != NULL)
3080                                 OPENSSL_free(s->session->psk_identity);
3081                         s->session->psk_identity = BUF_strdup(identity);
3082                         if (s->session->psk_identity == NULL)
3083                                 {
3084                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3085                                         ERR_R_MALLOC_FAILURE);
3086                                 goto psk_err;
3087                                 }
3088
3089                         s->session->master_key_length =
3090                                 s->method->ssl3_enc->generate_master_secret(s,
3091                                         s->session->master_key,
3092                                         psk_or_pre_ms, pre_ms_len);
3093                         n = strlen(identity);
3094                         s2n(n, p);
3095                         memcpy(p, identity, n);
3096                         n+=2;
3097                         psk_err = 0;
3098                 psk_err:
3099                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
3100                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3101                         if (psk_err != 0)
3102                                 {
3103                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3104                                 goto err;
3105                                 }
3106                         }
3107 #endif
3108                 else
3109                         {
3110                         ssl3_send_alert(s, SSL3_AL_FATAL,
3111                             SSL_AD_HANDSHAKE_FAILURE);
3112                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3113                             ERR_R_INTERNAL_ERROR);
3114                         goto err;
3115                         }
3116
3117                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3118                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3119                 }
3120
3121         /* SSL3_ST_CW_KEY_EXCH_B */
3122         return ssl_do_write(s);
3123 err:
3124 #ifndef OPENSSL_NO_ECDH
3125         BN_CTX_free(bn_ctx);
3126         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3127         if (clnt_ecdh != NULL)
3128                 EC_KEY_free(clnt_ecdh);
3129         EVP_PKEY_free(srvr_pub_pkey);
3130 #endif
3131         return(-1);
3132         }
3133
3134 int ssl3_send_client_verify(SSL *s)
3135         {
3136         unsigned char *p;
3137         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3138         EVP_PKEY *pkey;
3139         EVP_PKEY_CTX *pctx=NULL;
3140         EVP_MD_CTX mctx;
3141         unsigned u=0;
3142         unsigned long n;
3143         int j;
3144
3145         EVP_MD_CTX_init(&mctx);
3146
3147         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3148                 {
3149                 p= ssl_handshake_start(s);
3150                 pkey=s->cert->key->privatekey;
3151 /* Create context from key and test if sha1 is allowed as digest */
3152                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3153                 EVP_PKEY_sign_init(pctx);
3154                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3155                         {
3156                         if (!SSL_USE_SIGALGS(s))
3157                                 s->method->ssl3_enc->cert_verify_mac(s,
3158                                                 NID_sha1,
3159                                                 &(data[MD5_DIGEST_LENGTH]));
3160                         }
3161                 else
3162                         {
3163                         ERR_clear_error();
3164                         }
3165                 /* For TLS v1.2 send signature algorithm and signature
3166                  * using agreed digest and cached handshake records.
3167                  */
3168                 if (SSL_USE_SIGALGS(s))
3169                         {
3170                         long hdatalen = 0;
3171                         void *hdata;
3172                         const EVP_MD *md = s->cert->key->digest;
3173                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3174                                                                 &hdata);
3175                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3176                                 {
3177                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3178                                                 ERR_R_INTERNAL_ERROR);
3179                                 goto err;
3180                                 }
3181                         p += 2;
3182 #ifdef SSL_DEBUG
3183                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3184                                                         EVP_MD_name(md));
3185 #endif
3186                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3187                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3188                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3189                                 {
3190                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3191                                                 ERR_R_EVP_LIB);
3192                                 goto err;
3193                                 }
3194                         s2n(u,p);
3195                         n = u + 4;
3196                         if (!ssl3_digest_cached_records(s))
3197                                 goto err;
3198                         }
3199                 else
3200 #ifndef OPENSSL_NO_RSA
3201                 if (pkey->type == EVP_PKEY_RSA)
3202                         {
3203                         s->method->ssl3_enc->cert_verify_mac(s,
3204                                 NID_md5,
3205                                 &(data[0]));
3206                         if (RSA_sign(NID_md5_sha1, data,
3207                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3208                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3209                                 {
3210                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3211                                 goto err;
3212                                 }
3213                         s2n(u,p);
3214                         n=u+2;
3215                         }
3216                 else
3217 #endif
3218 #ifndef OPENSSL_NO_DSA
3219                         if (pkey->type == EVP_PKEY_DSA)
3220                         {
3221                         if (!DSA_sign(pkey->save_type,
3222                                 &(data[MD5_DIGEST_LENGTH]),
3223                                 SHA_DIGEST_LENGTH,&(p[2]),
3224                                 (unsigned int *)&j,pkey->pkey.dsa))
3225                                 {
3226                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3227                                 goto err;
3228                                 }
3229                         s2n(j,p);
3230                         n=j+2;
3231                         }
3232                 else
3233 #endif
3234 #ifndef OPENSSL_NO_ECDSA
3235                         if (pkey->type == EVP_PKEY_EC)
3236                         {
3237                         if (!ECDSA_sign(pkey->save_type,
3238                                 &(data[MD5_DIGEST_LENGTH]),
3239                                 SHA_DIGEST_LENGTH,&(p[2]),
3240                                 (unsigned int *)&j,pkey->pkey.ec))
3241                                 {
3242                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3243                                     ERR_R_ECDSA_LIB);
3244                                 goto err;
3245                                 }
3246                         s2n(j,p);
3247                         n=j+2;
3248                         }
3249                 else
3250 #endif
3251                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3252                 {
3253                 unsigned char signbuf[64];
3254                 int i;
3255                 size_t sigsize=64;
3256                 s->method->ssl3_enc->cert_verify_mac(s,
3257                         NID_id_GostR3411_94,
3258                         data);
3259                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3260                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3261                         ERR_R_INTERNAL_ERROR);
3262                         goto err;
3263                 }
3264                 for (i=63,j=0; i>=0; j++, i--) {
3265                         p[2+j]=signbuf[i];
3266                 }
3267                 s2n(j,p);
3268                 n=j+2;
3269                 }
3270                 else
3271                 {
3272                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3273                         goto err;
3274                 }
3275                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3276                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3277                 }
3278         EVP_MD_CTX_cleanup(&mctx);
3279         EVP_PKEY_CTX_free(pctx);
3280         return ssl_do_write(s);
3281 err:
3282         EVP_MD_CTX_cleanup(&mctx);
3283         EVP_PKEY_CTX_free(pctx);
3284         return(-1);
3285         }
3286
3287 /* Check a certificate can be used for client authentication. Currently
3288  * check cert exists, if we have a suitable digest for TLS 1.2 if
3289  * static DH client certificates can be used and optionally checks
3290  * suitability for Suite B.
3291  */
3292 static int ssl3_check_client_certificate(SSL *s)
3293         {
3294         unsigned long alg_k;
3295         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3296                 return 0;
3297         /* If no suitable signature algorithm can't use certificate */
3298         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3299                 return 0;
3300         /* If strict mode check suitability of chain before using it.
3301          * This also adjusts suite B digest if necessary.
3302          */
3303         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3304                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3305                 return 0;
3306         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3307         /* See if we can use client certificate for fixed DH */
3308         if (alg_k & (SSL_kDHr|SSL_kDHd))
3309                 {
3310                 SESS_CERT *scert = s->session->sess_cert;
3311                 int i = scert->peer_cert_type;
3312                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3313                 clkey = s->cert->key->privatekey;
3314                 /* If client key not DH assume it can be used */
3315                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3316                         return 1;
3317                 if (i >= 0)
3318                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3319                 if (spkey)
3320                         {
3321                         /* Compare server and client parameters */
3322                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3323                         EVP_PKEY_free(spkey);
3324                         if (i != 1)
3325                                 return 0;
3326                         }
3327                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3328                 }
3329         return 1;
3330         }
3331
3332 int ssl3_send_client_certificate(SSL *s)
3333         {
3334         X509 *x509=NULL;
3335         EVP_PKEY *pkey=NULL;
3336         int i;
3337
3338         if (s->state == SSL3_ST_CW_CERT_A)
3339                 {
3340                 /* Let cert callback update client certificates if required */
3341                 if (s->cert->cert_cb)
3342                         {
3343                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3344                         if (i < 0)
3345                                 {
3346                                 s->rwstate=SSL_X509_LOOKUP;
3347                                 return -1;
3348                                 }
3349                         if (i == 0)
3350                                 {
3351                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3352                                 return 0;
3353                                 }
3354                         s->rwstate=SSL_NOTHING;
3355                         }
3356                 if (ssl3_check_client_certificate(s))
3357                         s->state=SSL3_ST_CW_CERT_C;
3358                 else
3359                         s->state=SSL3_ST_CW_CERT_B;
3360                 }
3361
3362         /* We need to get a client cert */
3363         if (s->state == SSL3_ST_CW_CERT_B)
3364                 {
3365                 /* If we get an error, we need to
3366                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3367                  * We then get retied later */
3368                 i=0;
3369                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3370                 if (i < 0)
3371                         {
3372                         s->rwstate=SSL_X509_LOOKUP;
3373                         return(-1);
3374                         }
3375                 s->rwstate=SSL_NOTHING;
3376                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3377                         {
3378                         s->state=SSL3_ST_CW_CERT_B;
3379                         if (    !SSL_use_certificate(s,x509) ||
3380                                 !SSL_use_PrivateKey(s,pkey))
3381                                 i=0;
3382                         }
3383                 else if (i == 1)
3384                         {
3385                         i=0;
3386                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3387                         }
3388
3389                 if (x509 != NULL) X509_free(x509);
3390                 if (pkey != NULL) EVP_PKEY_free(pkey);
3391                 if (i && !ssl3_check_client_certificate(s))
3392                         i = 0;
3393                 if (i == 0)
3394                         {
3395                         if (s->version == SSL3_VERSION)
3396                                 {
3397                                 s->s3->tmp.cert_req=0;
3398                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3399                                 return(1);
3400                                 }
3401                         else
3402                                 {
3403                                 s->s3->tmp.cert_req=2;
3404                                 }
3405                         }
3406
3407                 /* Ok, we have a cert */
3408                 s->state=SSL3_ST_CW_CERT_C;
3409                 }
3410
3411         if (s->state == SSL3_ST_CW_CERT_C)
3412                 {
3413                 s->state=SSL3_ST_CW_CERT_D;
3414                 if (!ssl3_output_cert_chain(s,
3415                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3416                         {
3417                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3418                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3419                         return 0;
3420                         }
3421                 }
3422         /* SSL3_ST_CW_CERT_D */
3423         return ssl_do_write(s);
3424         }
3425
3426 #define has_bits(i,m)   (((i)&(m)) == (m))
3427
3428 int ssl3_check_cert_and_algorithm(SSL *s)
3429         {
3430         int i,idx;
3431         long alg_k,alg_a;
3432         EVP_PKEY *pkey=NULL;
3433         SESS_CERT *sc;
3434 #ifndef OPENSSL_NO_RSA
3435         RSA *rsa;
3436 #endif
3437 #ifndef OPENSSL_NO_DH
3438         DH *dh;
3439 #endif
3440
3441         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3442         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3443
3444         /* we don't have a certificate */
3445         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3446                 return(1);
3447
3448         sc=s->session->sess_cert;
3449         if (sc == NULL)
3450                 {
3451                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3452                 goto err;
3453                 }
3454
3455 #ifndef OPENSSL_NO_RSA
3456         rsa=s->session->sess_cert->peer_rsa_tmp;
3457 #endif
3458 #ifndef OPENSSL_NO_DH
3459         dh=s->session->sess_cert->peer_dh_tmp;
3460 #endif
3461
3462         /* This is the passed certificate */
3463
3464         idx=sc->peer_cert_type;
3465 #ifndef OPENSSL_NO_ECDH
3466         if (idx == SSL_PKEY_ECC)
3467                 {
3468                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3469                                                                 s) == 0)
3470                         { /* check failed */
3471                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3472                         goto f_err;
3473                         }
3474                 else
3475                         {
3476                         return 1;
3477                         }
3478                 }
3479         else if (alg_a & SSL_aECDSA)
3480                 {
3481                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3482                 goto f_err;
3483                 }
3484         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3485                 {
3486                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3487                 goto f_err;
3488                 }
3489 #endif
3490         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3491         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3492         EVP_PKEY_free(pkey);
3493
3494
3495         /* Check that we have a certificate if we require one */
3496         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3497                 {
3498                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3499                 goto f_err;
3500                 }
3501 #ifndef OPENSSL_NO_DSA
3502         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3503                 {
3504                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3505                 goto f_err;
3506                 }
3507 #endif
3508 #ifndef OPENSSL_NO_RSA
3509         if ((alg_k & SSL_kRSA) &&
3510                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3511                 {
3512                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3513                 goto f_err;
3514                 }
3515 #endif
3516 #ifndef OPENSSL_NO_DH
3517         if ((alg_k & SSL_kDHE) &&
3518                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3519                 {
3520                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3521                 goto f_err;
3522                 }
3523         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3524                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3525                 {
3526                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3527                 goto f_err;
3528                 }
3529 #ifndef OPENSSL_NO_DSA
3530         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3531                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3532                 {
3533                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3534                 goto f_err;
3535                 }
3536 #endif
3537 #endif
3538
3539         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3540                 {
3541 #ifndef OPENSSL_NO_RSA
3542                 if (alg_k & SSL_kRSA)
3543                         {
3544                         if (rsa == NULL
3545                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3546                                 {
3547                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3548                                 goto f_err;
3549                                 }
3550                         }
3551                 else
3552 #endif
3553 #ifndef OPENSSL_NO_DH
3554                         if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
3555                             {
3556                             if (dh == NULL
3557                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3558                                 {
3559                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3560                                 goto f_err;
3561                                 }
3562                         }
3563                 else
3564 #endif
3565                         {
3566                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3567                         goto f_err;
3568                         }
3569                 }
3570         return(1);
3571 f_err:
3572         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3573 err:
3574         return(0);
3575         }
3576
3577 /* Check to see if handshake is full or resumed. Usually this is just a
3578  * case of checking to see if a cache hit has occurred. In the case of
3579  * session tickets we have to check the next message to be sure.
3580  */
3581
3582 #ifndef OPENSSL_NO_TLSEXT
3583 # ifndef OPENSSL_NO_NEXTPROTONEG
3584 int ssl3_send_next_proto(SSL *s)
3585         {
3586         unsigned int len, padding_len;
3587         unsigned char *d;
3588
3589         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3590                 {
3591                 len = s->next_proto_negotiated_len;
3592                 padding_len = 32 - ((len + 2) % 32);
3593                 d = (unsigned char *)s->init_buf->data;
3594                 d[4] = len;
3595                 memcpy(d + 5, s->next_proto_negotiated, len);
3596                 d[5 + len] = padding_len;
3597                 memset(d + 6 + len, 0, padding_len);
3598                 *(d++)=SSL3_MT_NEXT_PROTO;
3599                 l2n3(2 + len + padding_len, d);
3600                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3601                 s->init_num = 4 + 2 + len + padding_len;
3602                 s->init_off = 0;
3603                 }
3604
3605         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3606         }
3607 # endif
3608
3609 int ssl3_check_finished(SSL *s)
3610         {
3611         int ok;
3612         long n;
3613
3614         /* Read the message to see if it is supplemental data,
3615          * regardless if there is a session ticket this function is
3616          * called when we really expect a Certificate message, so
3617          * permit appropriate message length */
3618         n=s->method->ssl_get_message(s,
3619                 SSL3_ST_CR_CERT_A,
3620                 SSL3_ST_CR_CERT_B,
3621                 -1,
3622                 s->max_cert_list,
3623                 &ok);
3624         if (!ok) return((int)n);
3625         s->s3->tmp.reuse_message = 1;
3626
3627         if (s->s3->tmp.message_type == SSL3_MT_SUPPLEMENTAL_DATA)
3628                 return 3;
3629         /* If we have no ticket it cannot be a resumed session. */
3630         if (!s->session->tlsext_tick)
3631                 return 1;
3632         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3633                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3634                 return 2;
3635
3636         return 1;
3637         }
3638 #endif
3639
3640 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3641         {
3642         int i = 0;
3643 #ifndef OPENSSL_NO_ENGINE
3644         if (s->ctx->client_cert_engine)
3645                 {
3646                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3647                                                 SSL_get_client_CA_list(s),
3648                                                 px509, ppkey, NULL, NULL, NULL);
3649                 if (i != 0)
3650                         return i;
3651                 }
3652 #endif
3653         if (s->ctx->client_cert_cb)
3654                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3655         return i;
3656         }
3657
3658 #ifndef OPENSSL_NO_TLSEXT
3659 int tls1_send_client_supplemental_data(SSL *s, int *skip)
3660         {
3661         int al = 0;
3662         if (s->ctx->cli_supp_data_records_count)
3663                 {
3664                 unsigned char *p = NULL;
3665                 unsigned char *size_loc = NULL;
3666                 cli_supp_data_record *record = NULL;
3667                 size_t length = 0;
3668                 size_t i = 0;
3669
3670                 for (i = 0; i < s->ctx->cli_supp_data_records_count; i++)
3671                         {
3672                         const unsigned char *out = NULL;
3673                         unsigned short outlen = 0;
3674                         int cb_retval = 0;
3675                         record = &s->ctx->cli_supp_data_records[i];
3676
3677                         /* NULL callback or -1 omits supp data entry*/
3678                         if (!record->fn2)
3679                                 continue;
3680                         cb_retval = record->fn2(s, record->supp_data_type,
3681                                                 &out, &outlen, &al,
3682                                                 record->arg);
3683                         if (cb_retval == -1)
3684                                 continue; /* skip this supp data entry */
3685                         if (cb_retval == 0)
3686                                 {
3687                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3688                                 goto f_err;
3689                                 }
3690                         if (outlen == 0 || TLSEXT_MAXLEN_supplemental_data < outlen + 4 + length)
3691                                 {
3692                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3693                                 return 0;
3694                                 }
3695                         /* if first entry, write handshake message type */
3696                         if (length == 0)
3697                                 {
3698                                 if (!BUF_MEM_grow_clean(s->init_buf, 4))
3699                                         {
3700                                         SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3701                                         return 0;
3702                                         }
3703                                 p = (unsigned char *)s->init_buf->data;
3704                                 *(p++) = SSL3_MT_SUPPLEMENTAL_DATA;
3705                                 /* update message length when all
3706                                  * callbacks complete */
3707                                 size_loc = p;
3708                                 /* skip over handshake length field (3
3709                                  * bytes) and supp_data length field
3710                                  * (3 bytes) */
3711                                 p += 3 + 3;
3712                                 length += 1 +3 +3;
3713                                 }
3714                         if (!BUF_MEM_grow(s->init_buf, outlen + 4))
3715                                 {
3716                                 SSLerr(SSL_F_TLS1_SEND_CLIENT_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3717                                 return 0;
3718                                 }
3719                         s2n(record->supp_data_type, p);
3720                         s2n(outlen, p);
3721                         memcpy(p, out, outlen);
3722                         length += (outlen + 4);
3723                         p += outlen;
3724                         }
3725                 if (length > 0)
3726                         {
3727                         /* write handshake length */
3728                         l2n3(length - 4, size_loc);
3729                         /* supp_data length */
3730                         l2n3(length - 7, size_loc);
3731                         s->state = SSL3_ST_CW_SUPPLEMENTAL_DATA_B;
3732                         s->init_num = length;
3733                         s->init_off = 0;
3734                         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3735                         }
3736                 }
3737
3738         /* no supp data message sent */
3739         *skip = 1;
3740         s->init_num = 0;
3741         s->init_off = 0;
3742         return 1;
3743
3744         f_err:
3745         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3746         return 0;
3747         }
3748
3749 int tls1_get_server_supplemental_data(SSL *s)
3750         {
3751         int al = 0;
3752         int ok;
3753         long n;
3754         const unsigned char *p, *d;
3755         unsigned short supp_data_entry_type = 0;
3756         unsigned short supp_data_entry_len = 0;
3757         unsigned long supp_data_len = 0;
3758         size_t i;
3759         int cb_retval = 0;
3760
3761         n=s->method->ssl_get_message(s,
3762                                      SSL3_ST_CR_SUPPLEMENTAL_DATA_A,
3763                                      SSL3_ST_CR_SUPPLEMENTAL_DATA_B,
3764                                      SSL3_MT_SUPPLEMENTAL_DATA,
3765                                      /* use default limit */
3766                                      TLSEXT_MAXLEN_supplemental_data,
3767                                      &ok);
3768
3769         if (!ok) return((int)n);
3770
3771         p = (unsigned char *)s->init_msg;
3772         d = p;
3773         /* The message cannot be empty */
3774         if (n < 3)
3775                 {
3776                 al = SSL_AD_DECODE_ERROR;
3777                 SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA,SSL_R_LENGTH_MISMATCH);
3778                 goto f_err;
3779                 }
3780         n2l3(p, supp_data_len);
3781         while (p < d+supp_data_len)
3782                 {
3783                 n2s(p, supp_data_entry_type);
3784                 n2s(p, supp_data_entry_len);
3785                 /* if there is a callback for this supp data type, send it */
3786                 for (i=0; i < s->ctx->cli_supp_data_records_count; i++)
3787                         {
3788                         if (s->ctx->cli_supp_data_records[i].supp_data_type == supp_data_entry_type &&
3789                             s->ctx->cli_supp_data_records[i].fn1)
3790                                 {
3791                                 cb_retval = s->ctx->cli_supp_data_records[i].fn1(s, supp_data_entry_type, p,
3792                                                                                  supp_data_entry_len, &al,
3793                                                                                  s->ctx->cli_supp_data_records[i].arg);
3794                                 if (cb_retval == 0)
3795                                         {
3796                                         SSLerr(SSL_F_TLS1_GET_SERVER_SUPPLEMENTAL_DATA, ERR_R_SSL_LIB);
3797                                         goto f_err;
3798                                         }
3799                                 }
3800                         }
3801                 p += supp_data_entry_len;
3802                 }
3803         return 1;
3804 f_err:
3805         ssl3_send_alert(s,SSL3_AL_FATAL,al);
3806         return -1;
3807         }
3808 #endif