ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   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 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include <openssl/crypto.h>
 156 #include "ssl_locl.h"
 157 #include "kssl_lcl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 static const SSL_METHOD *ssl3_get_server_method(int ver);
 174
 175 static const SSL_METHOD *ssl3_get_server_method(int ver)
 176         {
 177         if (ver == SSL3_VERSION)
 178                 return(SSLv3_server_method());
 179         else
 180                 return(NULL);
 181         }
 182
 183 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 184                         ssl3_accept,
 185                         ssl_undefined_function,
 186                         ssl3_get_server_method)
 187
 188 int ssl3_accept(SSL *s)
 189         {
 190         BUF_MEM *buf;
 191         unsigned long alg_k,Time=(unsigned long)time(NULL);
 192         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 193         int ret= -1;
 194         int new_state,state,skip=0;
 195
 196         RAND_add(&Time,sizeof(Time),0);
 197         ERR_clear_error();
 198         clear_sys_error();
 199
 200         if (s->info_callback != NULL)
 201                 cb=s->info_callback;
 202         else if (s->ctx->info_callback != NULL)
 203                 cb=s->ctx->info_callback;
 204
 205         /* init things to blank */
 206         s->in_handshake++;
 207         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 208
 209         if (s->cert == NULL)
 210                 {
 211                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 212                 return(-1);
 213                 }
 214
 215         for (;;)
 216                 {
 217                 state=s->state;
 218
 219                 switch (s->state)
 220                         {
 221                 case SSL_ST_RENEGOTIATE:
 222                         s->renegotiate=1;
 223                         /* s->state=SSL_ST_ACCEPT; */
 224
 225                 case SSL_ST_BEFORE:
 226                 case SSL_ST_ACCEPT:
 227                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 228                 case SSL_ST_OK|SSL_ST_ACCEPT:
 229
 230                         s->server=1;
 231                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 232
 233                         if ((s->version>>8) != 3)
 234                                 {
 235                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 236                                 return -1;
 237                                 }
 238                         s->type=SSL_ST_ACCEPT;
 239
 240                         if (s->init_buf == NULL)
 241                                 {
 242                                 if ((buf=BUF_MEM_new()) == NULL)
 243                                         {
 244                                         ret= -1;
 245                                         goto end;
 246                                         }
 247                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 248                                         {
 249                                         ret= -1;
 250                                         goto end;
 251                                         }
 252                                 s->init_buf=buf;
 253                                 }
 254
 255                         if (!ssl3_setup_buffers(s))
 256                                 {
 257                                 ret= -1;
 258                                 goto end;
 259                                 }
 260
 261                         s->init_num=0;
 262
 263                         if (s->state != SSL_ST_RENEGOTIATE)
 264                                 {
 265                                 /* Ok, we now need to push on a buffering BIO so that
 266                                  * the output is sent in a way that TCP likes :-)
 267                                  */
 268                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 269
 270                                 ssl3_init_finished_mac(s);
 271                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 272                                 s->ctx->stats.sess_accept++;
 273                                 }
 274                         else if (!s->s3->send_connection_binding &&
 275                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 276                                 {
 277                                 /* Server attempting to renegotiate with
 278                                  * client that doesn't support secure
 279                                  * renegotiation.
 280                                  */
 281                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 282                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 283                                 ret = -1;
 284                                 goto end;
 285                                 }
 286                         else
 287                                 {
 288                                 /* s->state == SSL_ST_RENEGOTIATE,
 289                                  * we will just send a HelloRequest */
 290                                 s->ctx->stats.sess_accept_renegotiate++;
 291                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 292                                 }
 293                         break;
 294
 295                 case SSL3_ST_SW_HELLO_REQ_A:
 296                 case SSL3_ST_SW_HELLO_REQ_B:
 297
 298                         s->shutdown=0;
 299                         ret=ssl3_send_hello_request(s);
 300                         if (ret <= 0) goto end;
 301                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 302                         s->state=SSL3_ST_SW_FLUSH;
 303                         s->init_num=0;
 304
 305                         ssl3_init_finished_mac(s);
 306                         break;
 307
 308                 case SSL3_ST_SW_HELLO_REQ_C:
 309                         s->state=SSL_ST_OK;
 310                         break;
 311
 312                 case SSL3_ST_SR_CLNT_HELLO_A:
 313                 case SSL3_ST_SR_CLNT_HELLO_B:
 314                 case SSL3_ST_SR_CLNT_HELLO_C:
 315
 316                         s->shutdown=0;
 317                         ret=ssl3_get_client_hello(s);
 318                         if (ret <= 0) goto end;
 319
 320                         s->renegotiate = 2;
 321                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_SW_SRVR_HELLO_A:
 326                 case SSL3_ST_SW_SRVR_HELLO_B:
 327                         ret=ssl3_send_server_hello(s);
 328                         if (ret <= 0) goto end;
 329 #ifndef OPENSSL_NO_TLSEXT
 330                         if (s->hit)
 331                                 {
 332                                 if (s->tlsext_ticket_expected)
 333                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 334                                 else
 335                                         s->state=SSL3_ST_SW_CHANGE_A;
 336                                 }
 337 #else
 338                         if (s->hit)
 339                                         s->state=SSL3_ST_SW_CHANGE_A;
 340 #endif
 341                         else
 342                                 s->state=SSL3_ST_SW_CERT_A;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_SW_CERT_A:
 347                 case SSL3_ST_SW_CERT_B:
 348                         /* Check if it is anon DH or anon ECDH, */
 349                         /* normal PSK or KRB5 */
 350                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 351                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 352                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 353                                 {
 354                                 ret=ssl3_send_server_certificate(s);
 355                                 if (ret <= 0) goto end;
 356 #ifndef OPENSSL_NO_TLSEXT
 357                                 if (s->tlsext_status_expected)
 358                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 359                                 else
 360                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 361                                 }
 362                         else
 363                                 {
 364                                 skip = 1;
 365                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 366                                 }
 367 #else
 368                                 }
 369                         else
 370                                 skip=1;
 371
 372                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 373 #endif
 374                         s->init_num=0;
 375                         break;
 376
 377                 case SSL3_ST_SW_KEY_EXCH_A:
 378                 case SSL3_ST_SW_KEY_EXCH_B:
 379                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 380
 381                         /* clear this, it may get reset by
 382                          * send_server_key_exchange */
 383                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 384 #ifndef OPENSSL_NO_KRB5
 385                                 && !(alg_k & SSL_kKRB5)
 386 #endif /* OPENSSL_NO_KRB5 */
 387                                 )
 388                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 389                                  * even when forbidden by protocol specs
 390                                  * (handshake may fail as clients are not required to
 391                                  * be able to handle this) */
 392                                 s->s3->tmp.use_rsa_tmp=1;
 393                         else
 394                                 s->s3->tmp.use_rsa_tmp=0;
 395
 396
 397                         /* only send if a DH key exchange, fortezza or
 398                          * RSA but we have a sign only certificate
 399                          *
 400                          * PSK: may send PSK identity hints
 401                          *
 402                          * For ECC ciphersuites, we send a serverKeyExchange
 403                          * message only if the cipher suite is either
 404                          * ECDH-anon or ECDHE. In other cases, the
 405                          * server certificate contains the server's
 406                          * public key for key exchange.
 407                          */
 408                         if (s->s3->tmp.use_rsa_tmp
 409                         /* PSK: send ServerKeyExchange if PSK identity
 410                          * hint if provided */
 411 #ifndef OPENSSL_NO_PSK
 412                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 413 #endif
 414                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 415                             || (alg_k & SSL_kEECDH)
 416                             || ((alg_k & SSL_kRSA)
 417                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 418                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 419                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 420                                         )
 421                                     )
 422                                 )
 423                             )
 424                                 {
 425                                 ret=ssl3_send_server_key_exchange(s);
 426                                 if (ret <= 0) goto end;
 427                                 }
 428                         else
 429                                 skip=1;
 430
 431                         s->state=SSL3_ST_SW_CERT_REQ_A;
 432                         s->init_num=0;
 433                         break;
 434
 435                 case SSL3_ST_SW_CERT_REQ_A:
 436                 case SSL3_ST_SW_CERT_REQ_B:
 437                         if (/* don't request cert unless asked for it: */
 438                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 439                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 440                                  * don't request cert during re-negotiation: */
 441                                 ((s->session->peer != NULL) &&
 442                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 443                                 /* never request cert in anonymous ciphersuites
 444                                  * (see section "Certificate request" in SSL 3 drafts
 445                                  * and in RFC 2246): */
 446                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 447                                  /* ... except when the application insists on verification
 448                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 449                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 450                                  /* never request cert in Kerberos ciphersuites */
 451                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 452                                 /* With normal PSK Certificates and
 453                                  * Certificate Requests are omitted */
 454                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 455                                 {
 456                                 /* no cert request */
 457                                 skip=1;
 458                                 s->s3->tmp.cert_request=0;
 459                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 460                                 }
 461                         else
 462                                 {
 463                                 s->s3->tmp.cert_request=1;
 464                                 ret=ssl3_send_certificate_request(s);
 465                                 if (ret <= 0) goto end;
 466 #ifndef NETSCAPE_HANG_BUG
 467                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 468 #else
 469                                 s->state=SSL3_ST_SW_FLUSH;
 470                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 471 #endif
 472                                 s->init_num=0;
 473                                 }
 474                         break;
 475
 476                 case SSL3_ST_SW_SRVR_DONE_A:
 477                 case SSL3_ST_SW_SRVR_DONE_B:
 478                         ret=ssl3_send_server_done(s);
 479                         if (ret <= 0) goto end;
 480                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 481                         s->state=SSL3_ST_SW_FLUSH;
 482                         s->init_num=0;
 483                         break;
 484
 485                 case SSL3_ST_SW_FLUSH:
 486
 487                         /* This code originally checked to see if
 488                          * any data was pending using BIO_CTRL_INFO
 489                          * and then flushed. This caused problems
 490                          * as documented in PR#1939. The proposed
 491                          * fix doesn't completely resolve this issue
 492                          * as buggy implementations of BIO_CTRL_PENDING
 493                          * still exist. So instead we just flush
 494                          * unconditionally.
 495                          */
 496
 497                         s->rwstate=SSL_WRITING;
 498                         if (BIO_flush(s->wbio) <= 0)
 499                                 {
 500                                 ret= -1;
 501                                 goto end;
 502                                 }
 503                         s->rwstate=SSL_NOTHING;
 504
 505                         s->state=s->s3->tmp.next_state;
 506                         break;
 507
 508                 case SSL3_ST_SR_CERT_A:
 509                 case SSL3_ST_SR_CERT_B:
 510                         /* Check for second client hello (MS SGC) */
 511                         ret = ssl3_check_client_hello(s);
 512                         if (ret <= 0)
 513                                 goto end;
 514                         if (ret == 2)
 515                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 516                         else {
 517                                 if (s->s3->tmp.cert_request)
 518                                         {
 519                                         ret=ssl3_get_client_certificate(s);
 520                                         if (ret <= 0) goto end;
 521                                         }
 522                                 s->init_num=0;
 523                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 524                         }
 525                         break;
 526
 527                 case SSL3_ST_SR_KEY_EXCH_A:
 528                 case SSL3_ST_SR_KEY_EXCH_B:
 529                         ret=ssl3_get_client_key_exchange(s);
 530                         if (ret <= 0)
 531                                 goto end;
 532                         if (ret == 2)
 533                                 {
 534                                 /* For the ECDH ciphersuites when
 535                                  * the client sends its ECDH pub key in
 536                                  * a certificate, the CertificateVerify
 537                                  * message is not sent.
 538                                  * Also for GOST ciphersuites when
 539                                  * the client uses its key from the certificate
 540                                  * for key exchange.
 541                                  */
 542 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 543                                 s->state=SSL3_ST_SR_FINISHED_A;
 544 #else
 545                                 if (s->s3->next_proto_neg_seen)
 546                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 547                                 else
 548                                         s->state=SSL3_ST_SR_FINISHED_A;
 549 #endif
 550                                 s->init_num = 0;
 551                                 }
 552                         else
 553                                 {
 554                                 int offset=0;
 555                                 int dgst_num;
 556
 557                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 558                                 s->init_num=0;
 559
 560                                 /* We need to get hashes here so if there is
 561                                  * a client cert, it can be verified
 562                                  * FIXME - digest processing for CertificateVerify
 563                                  * should be generalized. But it is next step
 564                                  */
 565                                 if (s->s3->handshake_buffer)
 566                                         if (!ssl3_digest_cached_records(s))
 567                                                 return -1;
 568                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 569                                         if (s->s3->handshake_dgst[dgst_num])
 570                                                 {
 571                                                 int dgst_size;
 572
 573                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 574                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 575                                                 if (dgst_size < 0)
 576                                                         {
 577                                                         ret = -1;
 578                                                         goto end;
 579                                                         }
 580                                                 offset+=dgst_size;
 581                                                 }
 582                                 }
 583                         break;
 584
 585                 case SSL3_ST_SR_CERT_VRFY_A:
 586                 case SSL3_ST_SR_CERT_VRFY_B:
 587
 588                         /* we should decide if we expected this one */
 589                         ret=ssl3_get_cert_verify(s);
 590                         if (ret <= 0) goto end;
 591
 592 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 593                         s->state=SSL3_ST_SR_FINISHED_A;
 594 #else
 595                         if (s->s3->next_proto_neg_seen)
 596                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 597                         else
 598                                 s->state=SSL3_ST_SR_FINISHED_A;
 599 #endif
 600                         s->init_num=0;
 601                         break;
 602
 603 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 604                 case SSL3_ST_SR_NEXT_PROTO_A:
 605                 case SSL3_ST_SR_NEXT_PROTO_B:
 606                         ret=ssl3_get_next_proto(s);
 607                         if (ret <= 0) goto end;
 608                         s->init_num = 0;
 609                         s->state=SSL3_ST_SR_FINISHED_A;
 610                         break;
 611 #endif
 612
 613                 case SSL3_ST_SR_FINISHED_A:
 614                 case SSL3_ST_SR_FINISHED_B:
 615                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 616                                 SSL3_ST_SR_FINISHED_B);
 617                         if (ret <= 0) goto end;
 618 #ifndef OPENSSL_NO_TLSEXT
 619                         if (s->tlsext_ticket_expected)
 620                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 621                         else if (s->hit)
 622                                 s->state=SSL_ST_OK;
 623 #else
 624                         if (s->hit)
 625                                 s->state=SSL_ST_OK;
 626 #endif
 627                         else
 628                                 s->state=SSL3_ST_SW_CHANGE_A;
 629                         s->init_num=0;
 630                         break;
 631
 632 #ifndef OPENSSL_NO_TLSEXT
 633                 case SSL3_ST_SW_SESSION_TICKET_A:
 634                 case SSL3_ST_SW_SESSION_TICKET_B:
 635                         ret=ssl3_send_newsession_ticket(s);
 636                         if (ret <= 0) goto end;
 637                         s->state=SSL3_ST_SW_CHANGE_A;
 638                         s->init_num=0;
 639                         break;
 640
 641                 case SSL3_ST_SW_CERT_STATUS_A:
 642                 case SSL3_ST_SW_CERT_STATUS_B:
 643                         ret=ssl3_send_cert_status(s);
 644                         if (ret <= 0) goto end;
 645                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 646                         s->init_num=0;
 647                         break;
 648
 649 #endif
 650
 651                 case SSL3_ST_SW_CHANGE_A:
 652                 case SSL3_ST_SW_CHANGE_B:
 653
 654                         s->session->cipher=s->s3->tmp.new_cipher;
 655                         if (!s->method->ssl3_enc->setup_key_block(s))
 656                                 { ret= -1; goto end; }
 657
 658                         ret=ssl3_send_change_cipher_spec(s,
 659                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 660
 661                         if (ret <= 0) goto end;
 662                         s->state=SSL3_ST_SW_FINISHED_A;
 663                         s->init_num=0;
 664
 665                         if (!s->method->ssl3_enc->change_cipher_state(s,
 666                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 667                                 {
 668                                 ret= -1;
 669                                 goto end;
 670                                 }
 671
 672                         break;
 673
 674                 case SSL3_ST_SW_FINISHED_A:
 675                 case SSL3_ST_SW_FINISHED_B:
 676                         ret=ssl3_send_finished(s,
 677                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 678                                 s->method->ssl3_enc->server_finished_label,
 679                                 s->method->ssl3_enc->server_finished_label_len);
 680                         if (ret <= 0) goto end;
 681                         s->state=SSL3_ST_SW_FLUSH;
 682                         if (s->hit)
 683                                 {
 684 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 685                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 686 #else
 687                                 if (s->s3->next_proto_neg_seen)
 688                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 689                                 else
 690                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 691 #endif
 692                                 }
 693                         else
 694                                 s->s3->tmp.next_state=SSL_ST_OK;
 695                         s->init_num=0;
 696                         break;
 697
 698                 case SSL_ST_OK:
 699                         /* clean a few things up */
 700                         ssl3_cleanup_key_block(s);
 701
 702                         BUF_MEM_free(s->init_buf);
 703                         s->init_buf=NULL;
 704
 705                         /* remove buffering on output */
 706                         ssl_free_wbio_buffer(s);
 707
 708                         s->init_num=0;
 709
 710                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 711                                 {
 712                                 /* actually not necessarily a 'new' session unless
 713                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 714
 715                                 s->renegotiate=0;
 716                                 s->new_session=0;
 717
 718                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 719
 720                                 s->ctx->stats.sess_accept_good++;
 721                                 /* s->server=1; */
 722                                 s->handshake_func=ssl3_accept;
 723
 724                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 725                                 }
 726
 727                         ret = 1;
 728                         goto end;
 729                         /* break; */
 730
 731                 default:
 732                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 733                         ret= -1;
 734                         goto end;
 735                         /* break; */
 736                         }
 737
 738                 if (!s->s3->tmp.reuse_message && !skip)
 739                         {
 740                         if (s->debug)
 741                                 {
 742                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 743                                         goto end;
 744                                 }
 745
 746
 747                         if ((cb != NULL) && (s->state != state))
 748                                 {
 749                                 new_state=s->state;
 750                                 s->state=state;
 751                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 752                                 s->state=new_state;
 753                                 }
 754                         }
 755                 skip=0;
 756                 }
 757 end:
 758         /* BIO_flush(s->wbio); */
 759
 760         s->in_handshake--;
 761         if (cb != NULL)
 762                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 763         return(ret);
 764         }
 765
 766 int ssl3_send_hello_request(SSL *s)
 767         {
 768         unsigned char *p;
 769
 770         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 771                 {
 772                 p=(unsigned char *)s->init_buf->data;
 773                 *(p++)=SSL3_MT_HELLO_REQUEST;
 774                 *(p++)=0;
 775                 *(p++)=0;
 776                 *(p++)=0;
 777
 778                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 779                 /* number of bytes to write */
 780                 s->init_num=4;
 781                 s->init_off=0;
 782                 }
 783
 784         /* SSL3_ST_SW_HELLO_REQ_B */
 785         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 786         }
 787
 788 int ssl3_check_client_hello(SSL *s)
 789         {
 790         int ok;
 791         long n;
 792
 793         /* this function is called when we really expect a Certificate message,
 794          * so permit appropriate message length */
 795         n=s->method->ssl_get_message(s,
 796                 SSL3_ST_SR_CERT_A,
 797                 SSL3_ST_SR_CERT_B,
 798                 -1,
 799                 s->max_cert_list,
 800                 &ok);
 801         if (!ok) return((int)n);
 802         s->s3->tmp.reuse_message = 1;
 803         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 804                 {
 805                 /* Throw away what we have done so far in the current handshake,
 806                  * which will now be aborted. (A full SSL_clear would be too much.)
 807                  * I hope that tmp.dh is the only thing that may need to be cleared
 808                  * when a handshake is not completed ... */
 809 #ifndef OPENSSL_NO_DH
 810                 if (s->s3->tmp.dh != NULL)
 811                         {
 812                         DH_free(s->s3->tmp.dh);
 813                         s->s3->tmp.dh = NULL;
 814                         }
 815 #endif
 816                 return 2;
 817                 }
 818         return 1;
 819 }
 820
 821 int ssl3_get_client_hello(SSL *s)
 822         {
 823         int i,j,ok,al,ret= -1;
 824         unsigned int cookie_len;
 825         long n;
 826         unsigned long id;
 827         unsigned char *p,*d,*q;
 828         SSL_CIPHER *c;
 829 #ifndef OPENSSL_NO_COMP
 830         SSL_COMP *comp=NULL;
 831 #endif
 832         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 833
 834         /* We do this so that we will respond with our native type.
 835          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 836          * This down switching should be handled by a different method.
 837          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 838          * TLSv1.
 839          */
 840         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 841                 {
 842                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 843                 }
 844         s->first_packet=1;
 845         n=s->method->ssl_get_message(s,
 846                 SSL3_ST_SR_CLNT_HELLO_B,
 847                 SSL3_ST_SR_CLNT_HELLO_C,
 848                 SSL3_MT_CLIENT_HELLO,
 849                 SSL3_RT_MAX_PLAIN_LENGTH,
 850                 &ok);
 851
 852         if (!ok) return((int)n);
 853         s->first_packet=0;
 854         d=p=(unsigned char *)s->init_msg;
 855
 856         /* use version from inside client hello, not from record header
 857          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 858         s->client_version=(((int)p[0])<<8)|(int)p[1];
 859         p+=2;
 860
 861         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 862             (s->version != DTLS1_VERSION && s->client_version < s->version))
 863                 {
 864                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 865                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 866                         {
 867                         /* similar to ssl3_get_record, send alert using remote version number */
 868                         s->version = s->client_version;
 869                         }
 870                 al = SSL_AD_PROTOCOL_VERSION;
 871                 goto f_err;
 872                 }
 873
 874         /* If we require cookies and this ClientHello doesn't
 875          * contain one, just return since we do not want to
 876          * allocate any memory yet. So check cookie length...
 877          */
 878         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 879                 {
 880                 unsigned int session_length, cookie_length;
 881
 882                 session_length = *(p + SSL3_RANDOM_SIZE);
 883                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 884
 885                 if (cookie_length == 0)
 886                         return 1;
 887                 }
 888
 889         /* load the client random */
 890         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 891         p+=SSL3_RANDOM_SIZE;
 892
 893         /* get the session-id */
 894         j= *(p++);
 895
 896         s->hit=0;
 897         /* Versions before 0.9.7 always allow session reuse during renegotiation
 898          * (i.e. when s->new_session is true), option
 899          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 900          * Maybe this optional behaviour should always have been the default,
 901          * but we cannot safely change the default behaviour (or new applications
 902          * might be written that become totally unsecure when compiled with
 903          * an earlier library version)
 904          */
 905         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 906                 {
 907                 if (!ssl_get_new_session(s,1))
 908                         goto err;
 909                 }
 910         else
 911                 {
 912                 i=ssl_get_prev_session(s, p, j, d + n);
 913                 if (i == 1)
 914                         { /* previous session */
 915                         s->hit=1;
 916                         }
 917                 else if (i == -1)
 918                         goto err;
 919                 else /* i == 0 */
 920                         {
 921                         if (!ssl_get_new_session(s,1))
 922                                 goto err;
 923                         }
 924                 }
 925
 926         p+=j;
 927
 928         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 929                 {
 930                 /* cookie stuff */
 931                 cookie_len = *(p++);
 932
 933                 /*
 934                  * The ClientHello may contain a cookie even if the
 935                  * HelloVerify message has not been sent--make sure that it
 936                  * does not cause an overflow.
 937                  */
 938                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 939                         {
 940                         /* too much data */
 941                         al = SSL_AD_DECODE_ERROR;
 942                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 943                         goto f_err;
 944                         }
 945
 946                 /* verify the cookie if appropriate option is set. */
 947                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 948                         cookie_len > 0)
 949                         {
 950                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 951
 952                         if ( s->ctx->app_verify_cookie_cb != NULL)
 953                                 {
 954                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 955                                         cookie_len) == 0)
 956                                         {
 957                                         al=SSL_AD_HANDSHAKE_FAILURE;
 958                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 959                                                 SSL_R_COOKIE_MISMATCH);
 960                                         goto f_err;
 961                                         }
 962                                 /* else cookie verification succeeded */
 963                                 }
 964                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 965                                                   s->d1->cookie_len) != 0) /* default verification */
 966                                 {
 967                                         al=SSL_AD_HANDSHAKE_FAILURE;
 968                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 969                                                 SSL_R_COOKIE_MISMATCH);
 970                                         goto f_err;
 971                                 }
 972
 973                         ret = 2;
 974                         }
 975
 976                 p += cookie_len;
 977                 }
 978
 979         n2s(p,i);
 980         if ((i == 0) && (j != 0))
 981                 {
 982                 /* we need a cipher if we are not resuming a session */
 983                 al=SSL_AD_ILLEGAL_PARAMETER;
 984                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 985                 goto f_err;
 986                 }
 987         if ((p+i) >= (d+n))
 988                 {
 989                 /* not enough data */
 990                 al=SSL_AD_DECODE_ERROR;
 991                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 992                 goto f_err;
 993                 }
 994         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 995                 == NULL))
 996                 {
 997                 goto err;
 998                 }
 999         p+=i;
1000
1001         /* If it is a hit, check that the cipher is in the list */
1002         if ((s->hit) && (i > 0))
1003                 {
1004                 j=0;
1005                 id=s->session->cipher->id;
1006
1007 #ifdef CIPHER_DEBUG
1008                 printf("client sent %d ciphers\n",sk_num(ciphers));
1009 #endif
1010                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1011                         {
1012                         c=sk_SSL_CIPHER_value(ciphers,i);
1013 #ifdef CIPHER_DEBUG
1014                         printf("client [%2d of %2d]:%s\n",
1015                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1016 #endif
1017                         if (c->id == id)
1018                                 {
1019                                 j=1;
1020                                 break;
1021                                 }
1022                         }
1023 /* Disabled because it can be used in a ciphersuite downgrade
1024  * attack: CVE-2010-4180.
1025  */
1026 #if 0
1027                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1028                         {
1029                         /* Special case as client bug workaround: the previously used cipher may
1030                          * not be in the current list, the client instead might be trying to
1031                          * continue using a cipher that before wasn't chosen due to server
1032                          * preferences.  We'll have to reject the connection if the cipher is not
1033                          * enabled, though. */
1034                         c = sk_SSL_CIPHER_value(ciphers, 0);
1035                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1036                                 {
1037                                 s->session->cipher = c;
1038                                 j = 1;
1039                                 }
1040                         }
1041 #endif
1042                 if (j == 0)
1043                         {
1044                         /* we need to have the cipher in the cipher
1045                          * list if we are asked to reuse it */
1046                         al=SSL_AD_ILLEGAL_PARAMETER;
1047                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1048                         goto f_err;
1049                         }
1050                 }
1051
1052         /* compression */
1053         i= *(p++);
1054         if ((p+i) > (d+n))
1055                 {
1056                 /* not enough data */
1057                 al=SSL_AD_DECODE_ERROR;
1058                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1059                 goto f_err;
1060                 }
1061         q=p;
1062         for (j=0; j<i; j++)
1063                 {
1064                 if (p[j] == 0) break;
1065                 }
1066
1067         p+=i;
1068         if (j >= i)
1069                 {
1070                 /* no compress */
1071                 al=SSL_AD_DECODE_ERROR;
1072                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1073                 goto f_err;
1074                 }
1075
1076 #ifndef OPENSSL_NO_TLSEXT
1077         /* TLS extensions*/
1078         if (s->version >= SSL3_VERSION)
1079                 {
1080                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1081                         {
1082                         /* 'al' set by ssl_parse_clienthello_tlsext */
1083                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1084                         goto f_err;
1085                         }
1086                 }
1087                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1088                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1089                         goto err;
1090                 }
1091
1092         /* Check if we want to use external pre-shared secret for this
1093          * handshake for not reused session only. We need to generate
1094          * server_random before calling tls_session_secret_cb in order to allow
1095          * SessionTicket processing to use it in key derivation. */
1096         {
1097                 unsigned long Time;
1098                 unsigned char *pos;
1099                 Time=(unsigned long)time(NULL);                 /* Time */
1100                 pos=s->s3->server_random;
1101                 l2n(Time,pos);
1102                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1103                         {
1104                         al=SSL_AD_INTERNAL_ERROR;
1105                         goto f_err;
1106                         }
1107         }
1108
1109         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1110                 {
1111                 SSL_CIPHER *pref_cipher=NULL;
1112
1113                 s->session->master_key_length=sizeof(s->session->master_key);
1114                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1115                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1116                         {
1117                         s->hit=1;
1118                         s->session->ciphers=ciphers;
1119                         s->session->verify_result=X509_V_OK;
1120
1121                         ciphers=NULL;
1122
1123                         /* check if some cipher was preferred by call back */
1124                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1125                         if (pref_cipher == NULL)
1126                                 {
1127                                 al=SSL_AD_HANDSHAKE_FAILURE;
1128                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1129                                 goto f_err;
1130                                 }
1131
1132                         s->session->cipher=pref_cipher;
1133
1134                         if (s->cipher_list)
1135                                 sk_SSL_CIPHER_free(s->cipher_list);
1136
1137                         if (s->cipher_list_by_id)
1138                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1139
1140                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1141                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1142                         }
1143                 }
1144 #endif
1145
1146         /* Worst case, we will use the NULL compression, but if we have other
1147          * options, we will now look for them.  We have i-1 compression
1148          * algorithms from the client, starting at q. */
1149         s->s3->tmp.new_compression=NULL;
1150 #ifndef OPENSSL_NO_COMP
1151         /* This only happens if we have a cache hit */
1152         if (s->session->compress_meth != 0)
1153                 {
1154                 int m, comp_id = s->session->compress_meth;
1155                 /* Perform sanity checks on resumed compression algorithm */
1156                 /* Can't disable compression */
1157                 if (s->options & SSL_OP_NO_COMPRESSION)
1158                         {
1159                         al=SSL_AD_INTERNAL_ERROR;
1160                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1161                         goto f_err;
1162                         }
1163                 /* Look for resumed compression method */
1164                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1165                         {
1166                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1167                         if (comp_id == comp->id)
1168                                 {
1169                                 s->s3->tmp.new_compression=comp;
1170                                 break;
1171                                 }
1172                         }
1173                 if (s->s3->tmp.new_compression == NULL)
1174                         {
1175                         al=SSL_AD_INTERNAL_ERROR;
1176                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1177                         goto f_err;
1178                         }
1179                 /* Look for resumed method in compression list */
1180                 for (m = 0; m < i; m++)
1181                         {
1182                         if (q[m] == comp_id)
1183                                 break;
1184                         }
1185                 if (m >= i)
1186                         {
1187                         al=SSL_AD_ILLEGAL_PARAMETER;
1188                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1189                         goto f_err;
1190                         }
1191                 }
1192         else if (s->hit)
1193                 comp = NULL;
1194         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1195                 { /* See if we have a match */
1196                 int m,nn,o,v,done=0;
1197
1198                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1199                 for (m=0; m<nn; m++)
1200                         {
1201                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1202                         v=comp->id;
1203                         for (o=0; o<i; o++)
1204                                 {
1205                                 if (v == q[o])
1206                                         {
1207                                         done=1;
1208                                         break;
1209                                         }
1210                                 }
1211                         if (done) break;
1212                         }
1213                 if (done)
1214                         s->s3->tmp.new_compression=comp;
1215                 else
1216                         comp=NULL;
1217                 }
1218 #else
1219         /* If compression is disabled we'd better not try to resume a session
1220          * using compression.
1221          */
1222         if (s->session->compress_meth != 0)
1223                 {
1224                 al=SSL_AD_INTERNAL_ERROR;
1225                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1226                 goto f_err;
1227                 }
1228 #endif
1229
1230         /* Given s->session->ciphers and SSL_get_ciphers, we must
1231          * pick a cipher */
1232
1233         if (!s->hit)
1234                 {
1235 #ifdef OPENSSL_NO_COMP
1236                 s->session->compress_meth=0;
1237 #else
1238                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1239 #endif
1240                 if (s->session->ciphers != NULL)
1241                         sk_SSL_CIPHER_free(s->session->ciphers);
1242                 s->session->ciphers=ciphers;
1243                 if (ciphers == NULL)
1244                         {
1245                         al=SSL_AD_ILLEGAL_PARAMETER;
1246                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1247                         goto f_err;
1248                         }
1249                 ciphers=NULL;
1250                 c=ssl3_choose_cipher(s,s->session->ciphers,
1251                                      SSL_get_ciphers(s));
1252
1253                 if (c == NULL)
1254                         {
1255                         al=SSL_AD_HANDSHAKE_FAILURE;
1256                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1257                         goto f_err;
1258                         }
1259                 s->s3->tmp.new_cipher=c;
1260                 /* check whether we should disable session resumption */
1261                 if (s->not_resumable_session_cb != NULL)
1262                         s->session->not_resumable=s->not_resumable_session_cb(s,
1263                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1264                 if (s->session->not_resumable)
1265                         /* do not send a session ticket */
1266                         s->tlsext_ticket_expected = 0;
1267                 }
1268         else
1269                 {
1270                 /* Session-id reuse */
1271 #ifdef REUSE_CIPHER_BUG
1272                 STACK_OF(SSL_CIPHER) *sk;
1273                 SSL_CIPHER *nc=NULL;
1274                 SSL_CIPHER *ec=NULL;
1275
1276                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1277                         {
1278                         sk=s->session->ciphers;
1279                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1280                                 {
1281                                 c=sk_SSL_CIPHER_value(sk,i);
1282                                 if (c->algorithm_enc & SSL_eNULL)
1283                                         nc=c;
1284                                 if (SSL_C_IS_EXPORT(c))
1285                                         ec=c;
1286                                 }
1287                         if (nc != NULL)
1288                                 s->s3->tmp.new_cipher=nc;
1289                         else if (ec != NULL)
1290                                 s->s3->tmp.new_cipher=ec;
1291                         else
1292                                 s->s3->tmp.new_cipher=s->session->cipher;
1293                         }
1294                 else
1295 #endif
1296                 s->s3->tmp.new_cipher=s->session->cipher;
1297                 }
1298
1299         if (!ssl3_digest_cached_records(s))
1300                 goto f_err;
1301
1302         /* we now have the following setup.
1303          * client_random
1304          * cipher_list          - our prefered list of ciphers
1305          * ciphers              - the clients prefered list of ciphers
1306          * compression          - basically ignored right now
1307          * ssl version is set   - sslv3
1308          * s->session           - The ssl session has been setup.
1309          * s->hit               - session reuse flag
1310          * s->tmp.new_cipher    - the new cipher to use.
1311          */
1312
1313         if (ret < 0) ret=1;
1314         if (0)
1315                 {
1316 f_err:
1317                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1318                 }
1319 err:
1320         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1321         return(ret);
1322         }
1323
1324 int ssl3_send_server_hello(SSL *s)
1325         {
1326         unsigned char *buf;
1327         unsigned char *p,*d;
1328         int i,sl;
1329         unsigned long l;
1330 #ifdef OPENSSL_NO_TLSEXT
1331         unsigned long Time;
1332 #endif
1333
1334         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1335                 {
1336                 buf=(unsigned char *)s->init_buf->data;
1337 #ifdef OPENSSL_NO_TLSEXT
1338                 p=s->s3->server_random;
1339                 /* Generate server_random if it was not needed previously */
1340                 Time=(unsigned long)time(NULL);                 /* Time */
1341                 l2n(Time,p);
1342                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1343                         return -1;
1344 #endif
1345                 /* Do the message type and length last */
1346                 d=p= &(buf[4]);
1347
1348                 *(p++)=s->version>>8;
1349                 *(p++)=s->version&0xff;
1350
1351                 /* Random stuff */
1352                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1353                 p+=SSL3_RANDOM_SIZE;
1354
1355                 /* now in theory we have 3 options to sending back the
1356                  * session id.  If it is a re-use, we send back the
1357                  * old session-id, if it is a new session, we send
1358                  * back the new session-id or we send back a 0 length
1359                  * session-id if we want it to be single use.
1360                  * Currently I will not implement the '0' length session-id
1361                  * 12-Jan-98 - I'll now support the '0' length stuff.
1362                  *
1363                  * We also have an additional case where stateless session
1364                  * resumption is successful: we always send back the old
1365                  * session id. In this case s->hit is non zero: this can
1366                  * only happen if stateless session resumption is succesful
1367                  * if session caching is disabled so existing functionality
1368                  * is unaffected.
1369                  */
1370                 if (s->session->not_resumable ||
1371                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1372                                 && !s->hit))
1373                         s->session->session_id_length=0;
1374
1375                 sl=s->session->session_id_length;
1376                 if (sl > (int)sizeof(s->session->session_id))
1377                         {
1378                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1379                         return -1;
1380                         }
1381                 *(p++)=sl;
1382                 memcpy(p,s->session->session_id,sl);
1383                 p+=sl;
1384
1385                 /* put the cipher */
1386                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1387                 p+=i;
1388
1389                 /* put the compression method */
1390 #ifdef OPENSSL_NO_COMP
1391                         *(p++)=0;
1392 #else
1393                 if (s->s3->tmp.new_compression == NULL)
1394                         *(p++)=0;
1395                 else
1396                         *(p++)=s->s3->tmp.new_compression->id;
1397 #endif
1398 #ifndef OPENSSL_NO_TLSEXT
1399                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1400                         {
1401                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1402                         return -1;
1403                         }
1404                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1405                         {
1406                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1407                         return -1;
1408                         }
1409 #endif
1410                 /* do the header */
1411                 l=(p-d);
1412                 d=buf;
1413                 *(d++)=SSL3_MT_SERVER_HELLO;
1414                 l2n3(l,d);
1415
1416                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1417                 /* number of bytes to write */
1418                 s->init_num=p-buf;
1419                 s->init_off=0;
1420                 }
1421
1422         /* SSL3_ST_SW_SRVR_HELLO_B */
1423         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1424         }
1425
1426 int ssl3_send_server_done(SSL *s)
1427         {
1428         unsigned char *p;
1429
1430         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1431                 {
1432                 p=(unsigned char *)s->init_buf->data;
1433
1434                 /* do the header */
1435                 *(p++)=SSL3_MT_SERVER_DONE;
1436                 *(p++)=0;
1437                 *(p++)=0;
1438                 *(p++)=0;
1439
1440                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1441                 /* number of bytes to write */
1442                 s->init_num=4;
1443                 s->init_off=0;
1444                 }
1445
1446         /* SSL3_ST_SW_SRVR_DONE_B */
1447         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1448         }
1449
1450 int ssl3_send_server_key_exchange(SSL *s)
1451         {
1452 #ifndef OPENSSL_NO_RSA
1453         unsigned char *q;
1454         int j,num;
1455         RSA *rsa;
1456         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1457         unsigned int u;
1458 #endif
1459 #ifndef OPENSSL_NO_DH
1460         DH *dh=NULL,*dhp;
1461 #endif
1462 #ifndef OPENSSL_NO_ECDH
1463         EC_KEY *ecdh=NULL, *ecdhp;
1464         unsigned char *encodedPoint = NULL;
1465         int encodedlen = 0;
1466         int curve_id = 0;
1467         BN_CTX *bn_ctx = NULL;
1468 #endif
1469         EVP_PKEY *pkey;
1470         unsigned char *p,*d;
1471         int al,i;
1472         unsigned long type;
1473         int n;
1474         CERT *cert;
1475         BIGNUM *r[4];
1476         int nr[4],kn;
1477         BUF_MEM *buf;
1478         EVP_MD_CTX md_ctx;
1479
1480         EVP_MD_CTX_init(&md_ctx);
1481         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1482                 {
1483                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1484                 cert=s->cert;
1485
1486                 buf=s->init_buf;
1487
1488                 r[0]=r[1]=r[2]=r[3]=NULL;
1489                 n=0;
1490 #ifndef OPENSSL_NO_RSA
1491                 if (type & SSL_kRSA)
1492                         {
1493                         rsa=cert->rsa_tmp;
1494                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1495                                 {
1496                                 rsa=s->cert->rsa_tmp_cb(s,
1497                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1498                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1499                                 if(rsa == NULL)
1500                                 {
1501                                         al=SSL_AD_HANDSHAKE_FAILURE;
1502                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1503                                         goto f_err;
1504                                 }
1505                                 RSA_up_ref(rsa);
1506                                 cert->rsa_tmp=rsa;
1507                                 }
1508                         if (rsa == NULL)
1509                                 {
1510                                 al=SSL_AD_HANDSHAKE_FAILURE;
1511                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1512                                 goto f_err;
1513                                 }
1514                         r[0]=rsa->n;
1515                         r[1]=rsa->e;
1516                         s->s3->tmp.use_rsa_tmp=1;
1517                         }
1518                 else
1519 #endif
1520 #ifndef OPENSSL_NO_DH
1521                         if (type & SSL_kEDH)
1522                         {
1523                         dhp=cert->dh_tmp;
1524                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1525                                 dhp=s->cert->dh_tmp_cb(s,
1526                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1527                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1528                         if (dhp == NULL)
1529                                 {
1530                                 al=SSL_AD_HANDSHAKE_FAILURE;
1531                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1532                                 goto f_err;
1533                                 }
1534
1535                         if (s->s3->tmp.dh != NULL)
1536                                 {
1537                                 DH_free(dh);
1538                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1539                                 goto err;
1540                                 }
1541
1542                         if ((dh=DHparams_dup(dhp)) == NULL)
1543                                 {
1544                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1545                                 goto err;
1546                                 }
1547
1548                         s->s3->tmp.dh=dh;
1549                         if ((dhp->pub_key == NULL ||
1550                              dhp->priv_key == NULL ||
1551                              (s->options & SSL_OP_SINGLE_DH_USE)))
1552                                 {
1553                                 if(!DH_generate_key(dh))
1554                                     {
1555                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1556                                            ERR_R_DH_LIB);
1557                                     goto err;
1558                                     }
1559                                 }
1560                         else
1561                                 {
1562                                 dh->pub_key=BN_dup(dhp->pub_key);
1563                                 dh->priv_key=BN_dup(dhp->priv_key);
1564                                 if ((dh->pub_key == NULL) ||
1565                                         (dh->priv_key == NULL))
1566                                         {
1567                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1568                                         goto err;
1569                                         }
1570                                 }
1571                         r[0]=dh->p;
1572                         r[1]=dh->g;
1573                         r[2]=dh->pub_key;
1574                         }
1575                 else
1576 #endif
1577 #ifndef OPENSSL_NO_ECDH
1578                         if (type & SSL_kEECDH)
1579                         {
1580                         const EC_GROUP *group;
1581
1582                         ecdhp=cert->ecdh_tmp;
1583                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1584                                 {
1585                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1586                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1587                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1588                                 }
1589                         if (ecdhp == NULL)
1590                                 {
1591                                 al=SSL_AD_HANDSHAKE_FAILURE;
1592                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1593                                 goto f_err;
1594                                 }
1595
1596                         if (s->s3->tmp.ecdh != NULL)
1597                                 {
1598                                 EC_KEY_free(s->s3->tmp.ecdh);
1599                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1600                                 goto err;
1601                                 }
1602
1603                         /* Duplicate the ECDH structure. */
1604                         if (ecdhp == NULL)
1605                                 {
1606                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1607                                 goto err;
1608                                 }
1609                         if (!EC_KEY_up_ref(ecdhp))
1610                                 {
1611                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1612                                 goto err;
1613                                 }
1614                         ecdh = ecdhp;
1615
1616                         s->s3->tmp.ecdh=ecdh;
1617                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1618                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1619                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1620                                 {
1621                                 if(!EC_KEY_generate_key(ecdh))
1622                                     {
1623                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1624                                     goto err;
1625                                     }
1626                                 }
1627
1628                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1629                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1630                             (EC_KEY_get0_private_key(ecdh) == NULL))
1631                                 {
1632                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1633                                 goto err;
1634                                 }
1635
1636                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1637                             (EC_GROUP_get_degree(group) > 163))
1638                                 {
1639                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1640                                 goto err;
1641                                 }
1642
1643                         /* XXX: For now, we only support ephemeral ECDH
1644                          * keys over named (not generic) curves. For
1645                          * supported named curves, curve_id is non-zero.
1646                          */
1647                         if ((curve_id =
1648                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1649                             == 0)
1650                                 {
1651                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1652                                 goto err;
1653                                 }
1654
1655                         /* Encode the public key.
1656                          * First check the size of encoding and
1657                          * allocate memory accordingly.
1658                          */
1659                         encodedlen = EC_POINT_point2oct(group,
1660                             EC_KEY_get0_public_key(ecdh),
1661                             POINT_CONVERSION_UNCOMPRESSED,
1662                             NULL, 0, NULL);
1663
1664                         encodedPoint = (unsigned char *)
1665                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1666                         bn_ctx = BN_CTX_new();
1667                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1668                                 {
1669                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1670                                 goto err;
1671                                 }
1672
1673
1674                         encodedlen = EC_POINT_point2oct(group,
1675                             EC_KEY_get0_public_key(ecdh),
1676                             POINT_CONVERSION_UNCOMPRESSED,
1677                             encodedPoint, encodedlen, bn_ctx);
1678
1679                         if (encodedlen == 0)
1680                                 {
1681                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1682                                 goto err;
1683                                 }
1684
1685                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1686
1687                         /* XXX: For now, we only support named (not
1688                          * generic) curves in ECDH ephemeral key exchanges.
1689                          * In this situation, we need four additional bytes
1690                          * to encode the entire ServerECDHParams
1691                          * structure.
1692                          */
1693                         n = 4 + encodedlen;
1694
1695                         /* We'll generate the serverKeyExchange message
1696                          * explicitly so we can set these to NULLs
1697                          */
1698                         r[0]=NULL;
1699                         r[1]=NULL;
1700                         r[2]=NULL;
1701                         r[3]=NULL;
1702                         }
1703                 else
1704 #endif /* !OPENSSL_NO_ECDH */
1705 #ifndef OPENSSL_NO_PSK
1706                         if (type & SSL_kPSK)
1707                                 {
1708                                 /* reserve size for record length and PSK identity hint*/
1709                                 n+=2+strlen(s->ctx->psk_identity_hint);
1710                                 }
1711                         else
1712 #endif /* !OPENSSL_NO_PSK */
1713                         {
1714                         al=SSL_AD_HANDSHAKE_FAILURE;
1715                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1716                         goto f_err;
1717                         }
1718                 for (i=0; r[i] != NULL; i++)
1719                         {
1720                         nr[i]=BN_num_bytes(r[i]);
1721                         n+=2+nr[i];
1722                         }
1723
1724                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1725                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1726                         {
1727                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1728                                 == NULL)
1729                                 {
1730                                 al=SSL_AD_DECODE_ERROR;
1731                                 goto f_err;
1732                                 }
1733                         kn=EVP_PKEY_size(pkey);
1734                         }
1735                 else
1736                         {
1737                         pkey=NULL;
1738                         kn=0;
1739                         }
1740
1741                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1742                         {
1743                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1744                         goto err;
1745                         }
1746                 d=(unsigned char *)s->init_buf->data;
1747                 p= &(d[4]);
1748
1749                 for (i=0; r[i] != NULL; i++)
1750                         {
1751                         s2n(nr[i],p);
1752                         BN_bn2bin(r[i],p);
1753                         p+=nr[i];
1754                         }
1755
1756 #ifndef OPENSSL_NO_ECDH
1757                 if (type & SSL_kEECDH)
1758                         {
1759                         /* XXX: For now, we only support named (not generic) curves.
1760                          * In this situation, the serverKeyExchange message has:
1761                          * [1 byte CurveType], [2 byte CurveName]
1762                          * [1 byte length of encoded point], followed by
1763                          * the actual encoded point itself
1764                          */
1765                         *p = NAMED_CURVE_TYPE;
1766                         p += 1;
1767                         *p = 0;
1768                         p += 1;
1769                         *p = curve_id;
1770                         p += 1;
1771                         *p = encodedlen;
1772                         p += 1;
1773                         memcpy((unsigned char*)p,
1774                             (unsigned char *)encodedPoint,
1775                             encodedlen);
1776                         OPENSSL_free(encodedPoint);
1777                         p += encodedlen;
1778                         }
1779 #endif
1780
1781 #ifndef OPENSSL_NO_PSK
1782                 if (type & SSL_kPSK)
1783                         {
1784                         /* copy PSK identity hint */
1785                         s2n(strlen(s->ctx->psk_identity_hint), p);
1786                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1787                         p+=strlen(s->ctx->psk_identity_hint);
1788                         }
1789 #endif
1790
1791                 /* not anonymous */
1792                 if (pkey != NULL)
1793                         {
1794                         /* n is the length of the params, they start at &(d[4])
1795                          * and p points to the space at the end. */
1796 #ifndef OPENSSL_NO_RSA
1797                         if (pkey->type == EVP_PKEY_RSA)
1798                                 {
1799                                 q=md_buf;
1800                                 j=0;
1801                                 for (num=2; num > 0; num--)
1802                                         {
1803                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1804                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1805                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1806                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1807                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1808                                         EVP_DigestFinal_ex(&md_ctx,q,
1809                                                 (unsigned int *)&i);
1810                                         q+=i;
1811                                         j+=i;
1812                                         }
1813                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1814                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1815                                         {
1816                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1817                                         goto err;
1818                                         }
1819                                 s2n(u,p);
1820                                 n+=u+2;
1821                                 }
1822                         else
1823 #endif
1824 #if !defined(OPENSSL_NO_DSA)
1825                                 if (pkey->type == EVP_PKEY_DSA)
1826                                 {
1827                                 /* lets do DSS */
1828                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1829                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1830                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1831                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1832                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1833                                         (unsigned int *)&i,pkey))
1834                                         {
1835                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1836                                         goto err;
1837                                         }
1838                                 s2n(i,p);
1839                                 n+=i+2;
1840                                 }
1841                         else
1842 #endif
1843 #if !defined(OPENSSL_NO_ECDSA)
1844                                 if (pkey->type == EVP_PKEY_EC)
1845                                 {
1846                                 /* let's do ECDSA */
1847                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1848                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1849                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1850                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1851                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1852                                         (unsigned int *)&i,pkey))
1853                                         {
1854                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1855                                         goto err;
1856                                         }
1857                                 s2n(i,p);
1858                                 n+=i+2;
1859                                 }
1860                         else
1861 #endif
1862                                 {
1863                                 /* Is this error check actually needed? */
1864                                 al=SSL_AD_HANDSHAKE_FAILURE;
1865                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1866                                 goto f_err;
1867                                 }
1868                         }
1869
1870                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1871                 l2n3(n,d);
1872
1873                 /* we should now have things packed up, so lets send
1874                  * it off */
1875                 s->init_num=n+4;
1876                 s->init_off=0;
1877                 }
1878
1879         s->state = SSL3_ST_SW_KEY_EXCH_B;
1880         EVP_MD_CTX_cleanup(&md_ctx);
1881         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1882 f_err:
1883         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1884 err:
1885 #ifndef OPENSSL_NO_ECDH
1886         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1887         BN_CTX_free(bn_ctx);
1888 #endif
1889         EVP_MD_CTX_cleanup(&md_ctx);
1890         return(-1);
1891         }
1892
1893 int ssl3_send_certificate_request(SSL *s)
1894         {
1895         unsigned char *p,*d;
1896         int i,j,nl,off,n;
1897         STACK_OF(X509_NAME) *sk=NULL;
1898         X509_NAME *name;
1899         BUF_MEM *buf;
1900
1901         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1902                 {
1903                 buf=s->init_buf;
1904
1905                 d=p=(unsigned char *)&(buf->data[4]);
1906
1907                 /* get the list of acceptable cert types */
1908                 p++;
1909                 n=ssl3_get_req_cert_type(s,p);
1910                 d[0]=n;
1911                 p+=n;
1912                 n++;
1913
1914                 off=n;
1915                 p+=2;
1916                 n+=2;
1917
1918                 sk=SSL_get_client_CA_list(s);
1919                 nl=0;
1920                 if (sk != NULL)
1921                         {
1922                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1923                                 {
1924                                 name=sk_X509_NAME_value(sk,i);
1925                                 j=i2d_X509_NAME(name,NULL);
1926                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1927                                         {
1928                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1929                                         goto err;
1930                                         }
1931                                 p=(unsigned char *)&(buf->data[4+n]);
1932                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1933                                         {
1934                                         s2n(j,p);
1935                                         i2d_X509_NAME(name,&p);
1936                                         n+=2+j;
1937                                         nl+=2+j;
1938                                         }
1939                                 else
1940                                         {
1941                                         d=p;
1942                                         i2d_X509_NAME(name,&p);
1943                                         j-=2; s2n(j,d); j+=2;
1944                                         n+=j;
1945                                         nl+=j;
1946                                         }
1947                                 }
1948                         }
1949                 /* else no CA names */
1950                 p=(unsigned char *)&(buf->data[4+off]);
1951                 s2n(nl,p);
1952
1953                 d=(unsigned char *)buf->data;
1954                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1955                 l2n3(n,d);
1956
1957                 /* we should now have things packed up, so lets send
1958                  * it off */
1959
1960                 s->init_num=n+4;
1961                 s->init_off=0;
1962 #ifdef NETSCAPE_HANG_BUG
1963                 p=(unsigned char *)s->init_buf->data + s->init_num;
1964
1965                 /* do the header */
1966                 *(p++)=SSL3_MT_SERVER_DONE;
1967                 *(p++)=0;
1968                 *(p++)=0;
1969                 *(p++)=0;
1970                 s->init_num += 4;
1971 #endif
1972
1973                 s->state = SSL3_ST_SW_CERT_REQ_B;
1974                 }
1975
1976         /* SSL3_ST_SW_CERT_REQ_B */
1977         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1978 err:
1979         return(-1);
1980         }
1981
1982 int ssl3_get_client_key_exchange(SSL *s)
1983         {
1984         int i,al,ok;
1985         long n;
1986         unsigned long alg_k;
1987         unsigned char *p;
1988 #ifndef OPENSSL_NO_RSA
1989         RSA *rsa=NULL;
1990         EVP_PKEY *pkey=NULL;
1991 #endif
1992 #ifndef OPENSSL_NO_DH
1993         BIGNUM *pub=NULL;
1994         DH *dh_srvr;
1995 #endif
1996 #ifndef OPENSSL_NO_KRB5
1997         KSSL_ERR kssl_err;
1998 #endif /* OPENSSL_NO_KRB5 */
1999
2000 #ifndef OPENSSL_NO_ECDH
2001         EC_KEY *srvr_ecdh = NULL;
2002         EVP_PKEY *clnt_pub_pkey = NULL;
2003         EC_POINT *clnt_ecpoint = NULL;
2004         BN_CTX *bn_ctx = NULL;
2005 #endif
2006
2007         n=s->method->ssl_get_message(s,
2008                 SSL3_ST_SR_KEY_EXCH_A,
2009                 SSL3_ST_SR_KEY_EXCH_B,
2010                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2011                 2048, /* ??? */
2012                 &ok);
2013
2014         if (!ok) return((int)n);
2015         p=(unsigned char *)s->init_msg;
2016
2017         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2018
2019 #ifndef OPENSSL_NO_RSA
2020         if (alg_k & SSL_kRSA)
2021                 {
2022                 /* FIX THIS UP EAY EAY EAY EAY */
2023                 if (s->s3->tmp.use_rsa_tmp)
2024                         {
2025                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2026                                 rsa=s->cert->rsa_tmp;
2027                         /* Don't do a callback because rsa_tmp should
2028                          * be sent already */
2029                         if (rsa == NULL)
2030                                 {
2031                                 al=SSL_AD_HANDSHAKE_FAILURE;
2032                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2033                                 goto f_err;
2034
2035                                 }
2036                         }
2037                 else
2038                         {
2039                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2040                         if (    (pkey == NULL) ||
2041                                 (pkey->type != EVP_PKEY_RSA) ||
2042                                 (pkey->pkey.rsa == NULL))
2043                                 {
2044                                 al=SSL_AD_HANDSHAKE_FAILURE;
2045                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2046                                 goto f_err;
2047                                 }
2048                         rsa=pkey->pkey.rsa;
2049                         }
2050
2051                 /* TLS and [incidentally] DTLS{0xFEFF} */
2052                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2053                         {
2054                         n2s(p,i);
2055                         if (n != i+2)
2056                                 {
2057                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2058                                         {
2059                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2060                                         goto err;
2061                                         }
2062                                 else
2063                                         p-=2;
2064                                 }
2065                         else
2066                                 n=i;
2067                         }
2068
2069                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2070
2071                 al = -1;
2072
2073                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2074                         {
2075                         al=SSL_AD_DECODE_ERROR;
2076                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2077                         }
2078
2079                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2080                         {
2081                         /* The premaster secret must contain the same version number as the
2082                          * ClientHello to detect version rollback attacks (strangely, the
2083                          * protocol does not offer such protection for DH ciphersuites).
2084                          * However, buggy clients exist that send the negotiated protocol
2085                          * version instead if the server does not support the requested
2086                          * protocol version.
2087                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2088                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2089                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2090                                 {
2091                                 al=SSL_AD_DECODE_ERROR;
2092                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2093
2094                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2095                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2096                                  * number check as a "bad version oracle" -- an alert would
2097                                  * reveal that the plaintext corresponding to some ciphertext
2098                                  * made up by the adversary is properly formatted except
2099                                  * that the version number is wrong.  To avoid such attacks,
2100                                  * we should treat this just like any other decryption error. */
2101                                 }
2102                         }
2103
2104                 if (al != -1)
2105                         {
2106                         /* Some decryption failure -- use random value instead as countermeasure
2107                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2108                          * (see RFC 2246, section 7.4.7.1). */
2109                         ERR_clear_error();
2110                         i = SSL_MAX_MASTER_KEY_LENGTH;
2111                         p[0] = s->client_version >> 8;
2112                         p[1] = s->client_version & 0xff;
2113                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2114                                 goto err;
2115                         }
2116
2117                 s->session->master_key_length=
2118                         s->method->ssl3_enc->generate_master_secret(s,
2119                                 s->session->master_key,
2120                                 p,i);
2121                 OPENSSL_cleanse(p,i);
2122                 }
2123         else
2124 #endif
2125 #ifndef OPENSSL_NO_DH
2126                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2127                 {
2128                 n2s(p,i);
2129                 if (n != i+2)
2130                         {
2131                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2132                                 {
2133                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2134                                 goto err;
2135                                 }
2136                         else
2137                                 {
2138                                 p-=2;
2139                                 i=(int)n;
2140                                 }
2141                         }
2142
2143                 if (n == 0L) /* the parameters are in the cert */
2144                         {
2145                         al=SSL_AD_HANDSHAKE_FAILURE;
2146                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2147                         goto f_err;
2148                         }
2149                 else
2150                         {
2151                         if (s->s3->tmp.dh == NULL)
2152                                 {
2153                                 al=SSL_AD_HANDSHAKE_FAILURE;
2154                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2155                                 goto f_err;
2156                                 }
2157                         else
2158                                 dh_srvr=s->s3->tmp.dh;
2159                         }
2160
2161                 pub=BN_bin2bn(p,i,NULL);
2162                 if (pub == NULL)
2163                         {
2164                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2165                         goto err;
2166                         }
2167
2168                 i=DH_compute_key(p,pub,dh_srvr);
2169
2170                 if (i <= 0)
2171                         {
2172                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2173                         goto err;
2174                         }
2175
2176                 DH_free(s->s3->tmp.dh);
2177                 s->s3->tmp.dh=NULL;
2178
2179                 BN_clear_free(pub);
2180                 pub=NULL;
2181                 s->session->master_key_length=
2182                         s->method->ssl3_enc->generate_master_secret(s,
2183                                 s->session->master_key,p,i);
2184                 OPENSSL_cleanse(p,i);
2185                 }
2186         else
2187 #endif
2188 #ifndef OPENSSL_NO_KRB5
2189         if (alg_k & SSL_kKRB5)
2190                 {
2191                 krb5_error_code         krb5rc;
2192                 krb5_data               enc_ticket;
2193                 krb5_data               authenticator;
2194                 krb5_data               enc_pms;
2195                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2196                 EVP_CIPHER_CTX          ciph_ctx;
2197                 const EVP_CIPHER        *enc = NULL;
2198                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2199                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2200                                                + EVP_MAX_BLOCK_LENGTH];
2201                 int                  padl, outl;
2202                 krb5_timestamp          authtime = 0;
2203                 krb5_ticket_times       ttimes;
2204
2205                 EVP_CIPHER_CTX_init(&ciph_ctx);
2206
2207                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2208
2209                 n2s(p,i);
2210                 enc_ticket.length = i;
2211
2212                 if (n < (long)(enc_ticket.length + 6))
2213                         {
2214                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2215                                 SSL_R_DATA_LENGTH_TOO_LONG);
2216                         goto err;
2217                         }
2218
2219                 enc_ticket.data = (char *)p;
2220                 p+=enc_ticket.length;
2221
2222                 n2s(p,i);
2223                 authenticator.length = i;
2224
2225                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2226                         {
2227                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2228                                 SSL_R_DATA_LENGTH_TOO_LONG);
2229                         goto err;
2230                         }
2231
2232                 authenticator.data = (char *)p;
2233                 p+=authenticator.length;
2234
2235                 n2s(p,i);
2236                 enc_pms.length = i;
2237                 enc_pms.data = (char *)p;
2238                 p+=enc_pms.length;
2239
2240                 /* Note that the length is checked again below,
2241                 ** after decryption
2242                 */
2243                 if(enc_pms.length > sizeof pms)
2244                         {
2245                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2246                                SSL_R_DATA_LENGTH_TOO_LONG);
2247                         goto err;
2248                         }
2249
2250                 if (n != (long)(enc_ticket.length + authenticator.length +
2251                                                 enc_pms.length + 6))
2252                         {
2253                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2254                                 SSL_R_DATA_LENGTH_TOO_LONG);
2255                         goto err;
2256                         }
2257
2258                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2259                                         &kssl_err)) != 0)
2260                         {
2261 #ifdef KSSL_DEBUG
2262                         printf("kssl_sget_tkt rtn %d [%d]\n",
2263                                 krb5rc, kssl_err.reason);
2264                         if (kssl_err.text)
2265                                 printf("kssl_err text= %s\n", kssl_err.text);
2266 #endif  /* KSSL_DEBUG */
2267                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2268                                 kssl_err.reason);
2269                         goto err;
2270                         }
2271
2272                 /*  Note: no authenticator is not considered an error,
2273                 **  but will return authtime == 0.
2274                 */
2275                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2276                                         &authtime, &kssl_err)) != 0)
2277                         {
2278 #ifdef KSSL_DEBUG
2279                         printf("kssl_check_authent rtn %d [%d]\n",
2280                                 krb5rc, kssl_err.reason);
2281                         if (kssl_err.text)
2282                                 printf("kssl_err text= %s\n", kssl_err.text);
2283 #endif  /* KSSL_DEBUG */
2284                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2285                                 kssl_err.reason);
2286                         goto err;
2287                         }
2288
2289                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2290                         {
2291                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2292                         goto err;
2293                         }
2294
2295 #ifdef KSSL_DEBUG
2296                 kssl_ctx_show(kssl_ctx);
2297 #endif  /* KSSL_DEBUG */
2298
2299                 enc = kssl_map_enc(kssl_ctx->enctype);
2300                 if (enc == NULL)
2301                     goto err;
2302
2303                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2304
2305                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2306                         {
2307                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2308                                 SSL_R_DECRYPTION_FAILED);
2309                         goto err;
2310                         }
2311                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2312                                         (unsigned char *)enc_pms.data, enc_pms.length))
2313                         {
2314                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2315                                 SSL_R_DECRYPTION_FAILED);
2316                         goto err;
2317                         }
2318                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2319                         {
2320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2321                                 SSL_R_DATA_LENGTH_TOO_LONG);
2322                         goto err;
2323                         }
2324                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2325                         {
2326                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2327                                 SSL_R_DECRYPTION_FAILED);
2328                         goto err;
2329                         }
2330                 outl += padl;
2331                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2332                         {
2333                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2334                                 SSL_R_DATA_LENGTH_TOO_LONG);
2335                         goto err;
2336                         }
2337                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2338                     {
2339                     /* The premaster secret must contain the same version number as the
2340                      * ClientHello to detect version rollback attacks (strangely, the
2341                      * protocol does not offer such protection for DH ciphersuites).
2342                      * However, buggy clients exist that send random bytes instead of
2343                      * the protocol version.
2344                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2345                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2346                      */
2347                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2348                         {
2349                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2350                                SSL_AD_DECODE_ERROR);
2351                         goto err;
2352                         }
2353                     }
2354
2355                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2356
2357                 s->session->master_key_length=
2358                         s->method->ssl3_enc->generate_master_secret(s,
2359                                 s->session->master_key, pms, outl);
2360
2361                 if (kssl_ctx->client_princ)
2362                         {
2363                         size_t len = strlen(kssl_ctx->client_princ);
2364                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2365                                 {
2366                                 s->session->krb5_client_princ_len = len;
2367                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2368                                 }
2369                         }
2370
2371
2372                 /*  Was doing kssl_ctx_free() here,
2373                 **  but it caused problems for apache.
2374                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2375                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2376                 */
2377                 }
2378         else
2379 #endif  /* OPENSSL_NO_KRB5 */
2380
2381 #ifndef OPENSSL_NO_ECDH
2382                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2383                 {
2384                 int ret = 1;
2385                 int field_size = 0;
2386                 const EC_KEY   *tkey;
2387                 const EC_GROUP *group;
2388                 const BIGNUM *priv_key;
2389
2390                 /* initialize structures for server's ECDH key pair */
2391                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2392                         {
2393                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2394                             ERR_R_MALLOC_FAILURE);
2395                         goto err;
2396                         }
2397
2398                 /* Let's get server private key and group information */
2399                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2400                         {
2401                         /* use the certificate */
2402                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2403                         }
2404                 else
2405                         {
2406                         /* use the ephermeral values we saved when
2407                          * generating the ServerKeyExchange msg.
2408                          */
2409                         tkey = s->s3->tmp.ecdh;
2410                         }
2411
2412                 group    = EC_KEY_get0_group(tkey);
2413                 priv_key = EC_KEY_get0_private_key(tkey);
2414
2415                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2416                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2417                         {
2418                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2419                                ERR_R_EC_LIB);
2420                         goto err;
2421                         }
2422
2423                 /* Let's get client's public key */
2424                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2425                         {
2426                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2427                             ERR_R_MALLOC_FAILURE);
2428                         goto err;
2429                         }
2430
2431                 if (n == 0L)
2432                         {
2433                         /* Client Publickey was in Client Certificate */
2434
2435                          if (alg_k & SSL_kEECDH)
2436                                  {
2437                                  al=SSL_AD_HANDSHAKE_FAILURE;
2438                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2439                                  goto f_err;
2440                                  }
2441                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2442                             == NULL) ||
2443                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2444                                 {
2445                                 /* XXX: For now, we do not support client
2446                                  * authentication using ECDH certificates
2447                                  * so this branch (n == 0L) of the code is
2448                                  * never executed. When that support is
2449                                  * added, we ought to ensure the key
2450                                  * received in the certificate is
2451                                  * authorized for key agreement.
2452                                  * ECDH_compute_key implicitly checks that
2453                                  * the two ECDH shares are for the same
2454                                  * group.
2455                                  */
2456                                 al=SSL_AD_HANDSHAKE_FAILURE;
2457                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2458                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2459                                 goto f_err;
2460                                 }
2461
2462                         if (EC_POINT_copy(clnt_ecpoint,
2463                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2464                                 {
2465                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2466                                         ERR_R_EC_LIB);
2467                                 goto err;
2468                                 }
2469                         ret = 2; /* Skip certificate verify processing */
2470                         }
2471                 else
2472                         {
2473                         /* Get client's public key from encoded point
2474                          * in the ClientKeyExchange message.
2475                          */
2476                         if ((bn_ctx = BN_CTX_new()) == NULL)
2477                                 {
2478                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2479                                     ERR_R_MALLOC_FAILURE);
2480                                 goto err;
2481                                 }
2482
2483                         /* Get encoded point length */
2484                         i = *p;
2485                         p += 1;
2486                         if (EC_POINT_oct2point(group,
2487                             clnt_ecpoint, p, i, bn_ctx) == 0)
2488                                 {
2489                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2490                                     ERR_R_EC_LIB);
2491                                 goto err;
2492                                 }
2493                         /* p is pointing to somewhere in the buffer
2494                          * currently, so set it to the start
2495                          */
2496                         p=(unsigned char *)s->init_buf->data;
2497                         }
2498
2499                 /* Compute the shared pre-master secret */
2500                 field_size = EC_GROUP_get_degree(group);
2501                 if (field_size <= 0)
2502                         {
2503                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2504                                ERR_R_ECDH_LIB);
2505                         goto err;
2506                         }
2507                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2508                 if (i <= 0)
2509                         {
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                             ERR_R_ECDH_LIB);
2512                         goto err;
2513                         }
2514
2515                 EVP_PKEY_free(clnt_pub_pkey);
2516                 EC_POINT_free(clnt_ecpoint);
2517                 EC_KEY_free(srvr_ecdh);
2518                 BN_CTX_free(bn_ctx);
2519                 EC_KEY_free(s->s3->tmp.ecdh);
2520                 s->s3->tmp.ecdh = NULL;
2521
2522                 /* Compute the master secret */
2523                 s->session->master_key_length = s->method->ssl3_enc-> \
2524                     generate_master_secret(s, s->session->master_key, p, i);
2525
2526                 OPENSSL_cleanse(p, i);
2527                 return (ret);
2528                 }
2529         else
2530 #endif
2531 #ifndef OPENSSL_NO_PSK
2532                 if (alg_k & SSL_kPSK)
2533                         {
2534                         unsigned char *t = NULL;
2535                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2536                         unsigned int pre_ms_len = 0, psk_len = 0;
2537                         int psk_err = 1;
2538                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2539
2540                         al=SSL_AD_HANDSHAKE_FAILURE;
2541
2542                         n2s(p,i);
2543                         if (n != i+2)
2544                                 {
2545                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2546                                         SSL_R_LENGTH_MISMATCH);
2547                                 goto psk_err;
2548                                 }
2549                         if (i > PSK_MAX_IDENTITY_LEN)
2550                                 {
2551                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2552                                         SSL_R_DATA_LENGTH_TOO_LONG);
2553                                 goto psk_err;
2554                                 }
2555                         if (s->psk_server_callback == NULL)
2556                                 {
2557                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2558                                        SSL_R_PSK_NO_SERVER_CB);
2559                                 goto psk_err;
2560                                 }
2561
2562                         /* Create guaranteed NULL-terminated identity
2563                          * string for the callback */
2564                         memcpy(tmp_id, p, i);
2565                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2566                         psk_len = s->psk_server_callback(s, tmp_id,
2567                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2568                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2569
2570                         if (psk_len > PSK_MAX_PSK_LEN)
2571                                 {
2572                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2573                                         ERR_R_INTERNAL_ERROR);
2574                                 goto psk_err;
2575                                 }
2576                         else if (psk_len == 0)
2577                                 {
2578                                 /* PSK related to the given identity not found */
2579                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2580                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2581                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2582                                 goto psk_err;
2583                                 }
2584
2585                         /* create PSK pre_master_secret */
2586                         pre_ms_len=2+psk_len+2+psk_len;
2587                         t = psk_or_pre_ms;
2588                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2589                         s2n(psk_len, t);
2590                         memset(t, 0, psk_len);
2591                         t+=psk_len;
2592                         s2n(psk_len, t);
2593
2594                         if (s->session->psk_identity != NULL)
2595                                 OPENSSL_free(s->session->psk_identity);
2596                         s->session->psk_identity = BUF_strdup((char *)p);
2597                         if (s->session->psk_identity == NULL)
2598                                 {
2599                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2600                                         ERR_R_MALLOC_FAILURE);
2601                                 goto psk_err;
2602                                 }
2603
2604                         if (s->session->psk_identity_hint != NULL)
2605                                 OPENSSL_free(s->session->psk_identity_hint);
2606                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2607                         if (s->ctx->psk_identity_hint != NULL &&
2608                                 s->session->psk_identity_hint == NULL)
2609                                 {
2610                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2611                                         ERR_R_MALLOC_FAILURE);
2612                                 goto psk_err;
2613                                 }
2614
2615                         s->session->master_key_length=
2616                                 s->method->ssl3_enc->generate_master_secret(s,
2617                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2618                         psk_err = 0;
2619                 psk_err:
2620                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2621                         if (psk_err != 0)
2622                                 goto f_err;
2623                         }
2624                 else
2625 #endif
2626                 if (alg_k & SSL_kGOST)
2627                         {
2628                         int ret = 0;
2629                         EVP_PKEY_CTX *pkey_ctx;
2630                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2631                         unsigned char premaster_secret[32], *start;
2632                         size_t outlen=32, inlen;
2633                         unsigned long alg_a;
2634
2635                         /* Get our certificate private key*/
2636                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2637                         if (alg_a & SSL_aGOST94)
2638                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2639                         else if (alg_a & SSL_aGOST01)
2640                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2641
2642                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2643                         EVP_PKEY_decrypt_init(pkey_ctx);
2644                         /* If client certificate is present and is of the same type, maybe
2645                          * use it for key exchange.  Don't mind errors from
2646                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2647                          * a client certificate for authorization only. */
2648                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2649                         if (client_pub_pkey)
2650                                 {
2651                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2652                                         ERR_clear_error();
2653                                 }
2654                         /* Decrypt session key */
2655                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2656                                 {
2657                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2658                                 goto gerr;
2659                                 }
2660                         if (p[1] == 0x81)
2661                                 {
2662                                 start = p+3;
2663                                 inlen = p[2];
2664                                 }
2665                         else if (p[1] < 0x80)
2666                                 {
2667                                 start = p+2;
2668                                 inlen = p[1];
2669                                 }
2670                         else
2671                                 {
2672                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2673                                 goto gerr;
2674                                 }
2675                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2676
2677                                 {
2678                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2679                                 goto gerr;
2680                                 }
2681                         /* Generate master secret */
2682                         s->session->master_key_length=
2683                                 s->method->ssl3_enc->generate_master_secret(s,
2684                                         s->session->master_key,premaster_secret,32);
2685                         /* Check if pubkey from client certificate was used */
2686                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2687                                 ret = 2;
2688                         else
2689                                 ret = 1;
2690                 gerr:
2691                         EVP_PKEY_free(client_pub_pkey);
2692                         EVP_PKEY_CTX_free(pkey_ctx);
2693                         if (ret)
2694                                 return ret;
2695                         else
2696                                 goto err;
2697                         }
2698                 else
2699                 {
2700                 al=SSL_AD_HANDSHAKE_FAILURE;
2701                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2702                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2703                 goto f_err;
2704                 }
2705
2706         return(1);
2707 f_err:
2708         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2709 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2710 err:
2711 #endif
2712 #ifndef OPENSSL_NO_ECDH
2713         EVP_PKEY_free(clnt_pub_pkey);
2714         EC_POINT_free(clnt_ecpoint);
2715         if (srvr_ecdh != NULL)
2716                 EC_KEY_free(srvr_ecdh);
2717         BN_CTX_free(bn_ctx);
2718 #endif
2719         return(-1);
2720         }
2721
2722 int ssl3_get_cert_verify(SSL *s)
2723         {
2724         EVP_PKEY *pkey=NULL;
2725         unsigned char *p;
2726         int al,ok,ret=0;
2727         long n;
2728         int type=0,i,j;
2729         X509 *peer;
2730
2731         n=s->method->ssl_get_message(s,
2732                 SSL3_ST_SR_CERT_VRFY_A,
2733                 SSL3_ST_SR_CERT_VRFY_B,
2734                 -1,
2735                 514, /* 514? */
2736                 &ok);
2737
2738         if (!ok) return((int)n);
2739
2740         if (s->session->peer != NULL)
2741                 {
2742                 peer=s->session->peer;
2743                 pkey=X509_get_pubkey(peer);
2744                 type=X509_certificate_type(peer,pkey);
2745                 }
2746         else
2747                 {
2748                 peer=NULL;
2749                 pkey=NULL;
2750                 }
2751
2752         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2753                 {
2754                 s->s3->tmp.reuse_message=1;
2755                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2756                         {
2757                         al=SSL_AD_UNEXPECTED_MESSAGE;
2758                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2759                         goto f_err;
2760                         }
2761                 ret=1;
2762                 goto end;
2763                 }
2764
2765         if (peer == NULL)
2766                 {
2767                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2768                 al=SSL_AD_UNEXPECTED_MESSAGE;
2769                 goto f_err;
2770                 }
2771
2772         if (!(type & EVP_PKT_SIGN))
2773                 {
2774                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2775                 al=SSL_AD_ILLEGAL_PARAMETER;
2776                 goto f_err;
2777                 }
2778
2779         if (s->s3->change_cipher_spec)
2780                 {
2781                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2782                 al=SSL_AD_UNEXPECTED_MESSAGE;
2783                 goto f_err;
2784                 }
2785
2786         /* we now have a signature that we need to verify */
2787         p=(unsigned char *)s->init_msg;
2788         /* Check for broken implementations of GOST ciphersuites */
2789         /* If key is GOST and n is exactly 64, it is bare
2790          * signature without length field */
2791         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2792                 pkey->type == NID_id_GostR3410_2001) )
2793                 {
2794                 i=64;
2795                 }
2796         else
2797                 {
2798                 n2s(p,i);
2799                 n-=2;
2800                 if (i > n)
2801                         {
2802                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2803                         al=SSL_AD_DECODE_ERROR;
2804                         goto f_err;
2805                         }
2806         }
2807         j=EVP_PKEY_size(pkey);
2808         if ((i > j) || (n > j) || (n <= 0))
2809                 {
2810                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2811                 al=SSL_AD_DECODE_ERROR;
2812                 goto f_err;
2813                 }
2814
2815 #ifndef OPENSSL_NO_RSA
2816         if (pkey->type == EVP_PKEY_RSA)
2817                 {
2818                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2819                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2820                                                         pkey->pkey.rsa);
2821                 if (i < 0)
2822                         {
2823                         al=SSL_AD_DECRYPT_ERROR;
2824                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2825                         goto f_err;
2826                         }
2827                 if (i == 0)
2828                         {
2829                         al=SSL_AD_DECRYPT_ERROR;
2830                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2831                         goto f_err;
2832                         }
2833                 }
2834         else
2835 #endif
2836 #ifndef OPENSSL_NO_DSA
2837                 if (pkey->type == EVP_PKEY_DSA)
2838                 {
2839                 j=DSA_verify(pkey->save_type,
2840                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2841                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2842                 if (j <= 0)
2843                         {
2844                         /* bad signature */
2845                         al=SSL_AD_DECRYPT_ERROR;
2846                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2847                         goto f_err;
2848                         }
2849                 }
2850         else
2851 #endif
2852 #ifndef OPENSSL_NO_ECDSA
2853                 if (pkey->type == EVP_PKEY_EC)
2854                 {
2855                 j=ECDSA_verify(pkey->save_type,
2856                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2857                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2858                 if (j <= 0)
2859                         {
2860                         /* bad signature */
2861                         al=SSL_AD_DECRYPT_ERROR;
2862                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2863                             SSL_R_BAD_ECDSA_SIGNATURE);
2864                         goto f_err;
2865                         }
2866                 }
2867         else
2868 #endif
2869         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2870                 {   unsigned char signature[64];
2871                         int idx;
2872                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2873                         EVP_PKEY_verify_init(pctx);
2874                         if (i!=64) {
2875                                 fprintf(stderr,"GOST signature length is %d",i);
2876                         }
2877                         for (idx=0;idx<64;idx++) {
2878                                 signature[63-idx]=p[idx];
2879                         }
2880                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2881                         EVP_PKEY_CTX_free(pctx);
2882                         if (j<=0)
2883                                 {
2884                                 al=SSL_AD_DECRYPT_ERROR;
2885                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2886                                         SSL_R_BAD_ECDSA_SIGNATURE);
2887                                 goto f_err;
2888                                 }
2889                 }
2890         else
2891                 {
2892                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2893                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2894                 goto f_err;
2895                 }
2896
2897
2898         ret=1;
2899         if (0)
2900                 {
2901 f_err:
2902                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2903                 }
2904 end:
2905         EVP_PKEY_free(pkey);
2906         return(ret);
2907         }
2908
2909 int ssl3_get_client_certificate(SSL *s)
2910         {
2911         int i,ok,al,ret= -1;
2912         X509 *x=NULL;
2913         unsigned long l,nc,llen,n;
2914         const unsigned char *p,*q;
2915         unsigned char *d;
2916         STACK_OF(X509) *sk=NULL;
2917
2918         n=s->method->ssl_get_message(s,
2919                 SSL3_ST_SR_CERT_A,
2920                 SSL3_ST_SR_CERT_B,
2921                 -1,
2922                 s->max_cert_list,
2923                 &ok);
2924
2925         if (!ok) return((int)n);
2926
2927         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2928                 {
2929                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2930                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2931                         {
2932                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2933                         al=SSL_AD_HANDSHAKE_FAILURE;
2934                         goto f_err;
2935                         }
2936                 /* If tls asked for a client cert, the client must return a 0 list */
2937                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2938                         {
2939                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2940                         al=SSL_AD_UNEXPECTED_MESSAGE;
2941                         goto f_err;
2942                         }
2943                 s->s3->tmp.reuse_message=1;
2944                 return(1);
2945                 }
2946
2947         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2948                 {
2949                 al=SSL_AD_UNEXPECTED_MESSAGE;
2950                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2951                 goto f_err;
2952                 }
2953         p=d=(unsigned char *)s->init_msg;
2954
2955         if ((sk=sk_X509_new_null()) == NULL)
2956                 {
2957                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2958                 goto err;
2959                 }
2960
2961         n2l3(p,llen);
2962         if (llen+3 != n)
2963                 {
2964                 al=SSL_AD_DECODE_ERROR;
2965                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2966                 goto f_err;
2967                 }
2968         for (nc=0; nc<llen; )
2969                 {
2970                 n2l3(p,l);
2971                 if ((l+nc+3) > llen)
2972                         {
2973                         al=SSL_AD_DECODE_ERROR;
2974                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2975                         goto f_err;
2976                         }
2977
2978                 q=p;
2979                 x=d2i_X509(NULL,&p,l);
2980                 if (x == NULL)
2981                         {
2982                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2983                         goto err;
2984                         }
2985                 if (p != (q+l))
2986                         {
2987                         al=SSL_AD_DECODE_ERROR;
2988                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2989                         goto f_err;
2990                         }
2991                 if (!sk_X509_push(sk,x))
2992                         {
2993                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2994                         goto err;
2995                         }
2996                 x=NULL;
2997                 nc+=l+3;
2998                 }
2999
3000         if (sk_X509_num(sk) <= 0)
3001                 {
3002                 /* TLS does not mind 0 certs returned */
3003                 if (s->version == SSL3_VERSION)
3004                         {
3005                         al=SSL_AD_HANDSHAKE_FAILURE;
3006                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3007                         goto f_err;
3008                         }
3009                 /* Fail for TLS only if we required a certificate */
3010                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3011                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3012                         {
3013                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3014                         al=SSL_AD_HANDSHAKE_FAILURE;
3015                         goto f_err;
3016                         }
3017                 }
3018         else
3019                 {
3020                 i=ssl_verify_cert_chain(s,sk);
3021                 if (i <= 0)
3022                         {
3023                         al=ssl_verify_alarm_type(s->verify_result);
3024                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3025                         goto f_err;
3026                         }
3027                 }
3028
3029         if (s->session->peer != NULL) /* This should not be needed */
3030                 X509_free(s->session->peer);
3031         s->session->peer=sk_X509_shift(sk);
3032         s->session->verify_result = s->verify_result;
3033
3034         /* With the current implementation, sess_cert will always be NULL
3035          * when we arrive here. */
3036         if (s->session->sess_cert == NULL)
3037                 {
3038                 s->session->sess_cert = ssl_sess_cert_new();
3039                 if (s->session->sess_cert == NULL)
3040                         {
3041                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3042                         goto err;
3043                         }
3044                 }
3045         if (s->session->sess_cert->cert_chain != NULL)
3046                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3047         s->session->sess_cert->cert_chain=sk;
3048         /* Inconsistency alert: cert_chain does *not* include the
3049          * peer's own certificate, while we do include it in s3_clnt.c */
3050
3051         sk=NULL;
3052
3053         ret=1;
3054         if (0)
3055                 {
3056 f_err:
3057                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3058                 }
3059 err:
3060         if (x != NULL) X509_free(x);
3061         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3062         return(ret);
3063         }
3064
3065 int ssl3_send_server_certificate(SSL *s)
3066         {
3067         unsigned long l;
3068         X509 *x;
3069
3070         if (s->state == SSL3_ST_SW_CERT_A)
3071                 {
3072                 x=ssl_get_server_send_cert(s);
3073                 if (x == NULL)
3074                         {
3075                         /* VRS: allow null cert if auth == KRB5 */
3076                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3077                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3078                                 {
3079                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3080                                 return(0);
3081                                 }
3082                         }
3083
3084                 l=ssl3_output_cert_chain(s,x);
3085                 s->state=SSL3_ST_SW_CERT_B;
3086                 s->init_num=(int)l;
3087                 s->init_off=0;
3088                 }
3089
3090         /* SSL3_ST_SW_CERT_B */
3091         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3092         }
3093 #ifndef OPENSSL_NO_TLSEXT
3094 int ssl3_send_newsession_ticket(SSL *s)
3095         {
3096         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3097                 {
3098                 unsigned char *p, *senc, *macstart;
3099                 int len, slen;
3100                 unsigned int hlen;
3101                 EVP_CIPHER_CTX ctx;
3102                 HMAC_CTX hctx;
3103                 SSL_CTX *tctx = s->initial_ctx;
3104                 unsigned char iv[EVP_MAX_IV_LENGTH];
3105                 unsigned char key_name[16];
3106
3107                 /* get session encoding length */
3108                 slen = i2d_SSL_SESSION(s->session, NULL);
3109                 /* Some length values are 16 bits, so forget it if session is
3110                  * too long
3111                  */
3112                 if (slen > 0xFF00)
3113                         return -1;
3114                 /* Grow buffer if need be: the length calculation is as
3115                  * follows 1 (size of message name) + 3 (message length
3116                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3117                  * 16 (key name) + max_iv_len (iv length) +
3118                  * session_length + max_enc_block_size (max encrypted session
3119                  * length) + max_md_size (HMAC).
3120                  */
3121                 if (!BUF_MEM_grow(s->init_buf,
3122                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3123                         EVP_MAX_MD_SIZE + slen))
3124                         return -1;
3125                 senc = OPENSSL_malloc(slen);
3126                 if (!senc)
3127                         return -1;
3128                 p = senc;
3129                 i2d_SSL_SESSION(s->session, &p);
3130
3131                 p=(unsigned char *)s->init_buf->data;
3132                 /* do the header */
3133                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3134                 /* Skip message length for now */
3135                 p += 3;
3136                 EVP_CIPHER_CTX_init(&ctx);
3137                 HMAC_CTX_init(&hctx);
3138                 /* Initialize HMAC and cipher contexts. If callback present
3139                  * it does all the work otherwise use generated values
3140                  * from parent ctx.
3141                  */
3142                 if (tctx->tlsext_ticket_key_cb)
3143                         {
3144                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3145                                                          &hctx, 1) < 0)
3146                                 {
3147                                 OPENSSL_free(senc);
3148                                 return -1;
3149                                 }
3150                         }
3151                 else
3152                         {
3153                         RAND_pseudo_bytes(iv, 16);
3154                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3155                                         tctx->tlsext_tick_aes_key, iv);
3156                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3157                                         tlsext_tick_md(), NULL);
3158                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3159                         }
3160                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3161                 /* Skip ticket length for now */
3162                 p += 2;
3163                 /* Output key name */
3164                 macstart = p;
3165                 memcpy(p, key_name, 16);
3166                 p += 16;
3167                 /* output IV */
3168                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3169                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3170                 /* Encrypt session data */
3171                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3172                 p += len;
3173                 EVP_EncryptFinal(&ctx, p, &len);
3174                 p += len;
3175                 EVP_CIPHER_CTX_cleanup(&ctx);
3176
3177                 HMAC_Update(&hctx, macstart, p - macstart);
3178                 HMAC_Final(&hctx, p, &hlen);
3179                 HMAC_CTX_cleanup(&hctx);
3180
3181                 p += hlen;
3182                 /* Now write out lengths: p points to end of data written */
3183                 /* Total length */
3184                 len = p - (unsigned char *)s->init_buf->data;
3185                 p=(unsigned char *)s->init_buf->data + 1;
3186                 l2n3(len - 4, p); /* Message length */
3187                 p += 4;
3188                 s2n(len - 10, p);  /* Ticket length */
3189
3190                 /* number of bytes to write */
3191                 s->init_num= len;
3192                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3193                 s->init_off=0;
3194                 OPENSSL_free(senc);
3195                 }
3196
3197         /* SSL3_ST_SW_SESSION_TICKET_B */
3198         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3199         }
3200
3201 int ssl3_send_cert_status(SSL *s)
3202         {
3203         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3204                 {
3205                 unsigned char *p;
3206                 /* Grow buffer if need be: the length calculation is as
3207                  * follows 1 (message type) + 3 (message length) +
3208                  * 1 (ocsp response type) + 3 (ocsp response length)
3209                  * + (ocsp response)
3210                  */
3211                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3212                         return -1;
3213
3214                 p=(unsigned char *)s->init_buf->data;
3215
3216                 /* do the header */
3217                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3218                 /* message length */
3219                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3220                 /* status type */
3221                 *(p++)= s->tlsext_status_type;
3222                 /* length of OCSP response */
3223                 l2n3(s->tlsext_ocsp_resplen, p);
3224                 /* actual response */
3225                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3226                 /* number of bytes to write */
3227                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3228                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3229                 s->init_off = 0;
3230                 }
3231
3232         /* SSL3_ST_SW_CERT_STATUS_B */
3233         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3234         }
3235
3236 # ifndef OPENSSL_NO_NPN
3237 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3238  * sets the next_proto member in s if found */
3239 int ssl3_get_next_proto(SSL *s)
3240         {
3241         int ok;
3242         int proto_len, padding_len;
3243         long n;
3244         const unsigned char *p;
3245
3246         /* Clients cannot send a NextProtocol message if we didn't see the
3247          * extension in their ClientHello */
3248         if (!s->s3->next_proto_neg_seen)
3249                 {
3250                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3251                 return -1;
3252                 }
3253
3254         n=s->method->ssl_get_message(s,
3255                 SSL3_ST_SR_NEXT_PROTO_A,
3256                 SSL3_ST_SR_NEXT_PROTO_B,
3257                 SSL3_MT_NEXT_PROTO,
3258                 514,  /* See the payload format below */
3259                 &ok);
3260
3261         if (!ok)
3262                 return((int)n);
3263
3264         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3265          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3266          * by ssl3_get_finished). */
3267         if (!s->s3->change_cipher_spec)
3268                 {
3269                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3270                 return -1;
3271                 }
3272
3273         if (n < 2)
3274                 return 0;  /* The body must be > 1 bytes long */
3275
3276         p=(unsigned char *)s->init_msg;
3277
3278         /* The payload looks like:
3279          *   uint8 proto_len;
3280          *   uint8 proto[proto_len];
3281          *   uint8 padding_len;
3282          *   uint8 padding[padding_len];
3283          */
3284         proto_len = p[0];
3285         if (proto_len + 2 > s->init_num)
3286                 return 0;
3287         padding_len = p[proto_len + 1];
3288         if (proto_len + padding_len + 2 != s->init_num)
3289                 return 0;
3290
3291         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3292         if (!s->next_proto_negotiated)
3293                 {
3294                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3295                 return 0;
3296                 }
3297         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3298         s->next_proto_negotiated_len = proto_len;
3299
3300         return 1;
3301         }
3302 # endif
3303 #endif