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 "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 183                         ssl3_accept,
 184                         ssl_undefined_function,
 185                         ssl3_get_server_method)
 186
 187 int ssl3_accept(SSL *s)
 188         {
 189         BUF_MEM *buf;
 190         unsigned long alg_k,Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         long num1;
 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->new_session=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->new_session = 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                         /* number of bytes to be flushed */
 487                         /* This originally and incorrectly called BIO_CTRL_INFO
 488                          * The reason why this is wrong is mentioned in PR#1949.
 489                          * Unfortunately, as suggested in that bug some
 490                          * versions of Apache unconditionally return 0
 491                          * for BIO_CTRL_WPENDING meaning we don't correctly
 492                          * flush data and some operations, like renegotiation,
 493                          * don't work. Other software may also be affected so
 494                          * call BIO_CTRL_INFO to retain compatibility with
 495                          * previous behaviour and BIO_CTRL_WPENDING if we
 496                          * get zero to address the PR#1949 case.
 497                          */
 498
 499                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 500                         if (num1 == 0)
 501                                 num1=BIO_ctrl(s->wbio,BIO_CTRL_WPENDING,0,NULL);
 502                         if (num1 == 0)
 503                                 num1=BIO_ctrl(s->wbio,BIO_CTRL_PENDING,0,NULL);
 504                         if (num1 > 0)
 505                                 {
 506                                 s->rwstate=SSL_WRITING;
 507                                 num1=BIO_flush(s->wbio);
 508                                 if (num1 <= 0) { ret= -1; goto end; }
 509                                 s->rwstate=SSL_NOTHING;
 510                                 }
 511
 512                         s->state=s->s3->tmp.next_state;
 513                         break;
 514
 515                 case SSL3_ST_SR_CERT_A:
 516                 case SSL3_ST_SR_CERT_B:
 517                         /* Check for second client hello (MS SGC) */
 518                         ret = ssl3_check_client_hello(s);
 519                         if (ret <= 0)
 520                                 goto end;
 521                         if (ret == 2)
 522                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 523                         else {
 524                                 if (s->s3->tmp.cert_request)
 525                                         {
 526                                         ret=ssl3_get_client_certificate(s);
 527                                         if (ret <= 0) goto end;
 528                                         }
 529                                 s->init_num=0;
 530                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 531                         }
 532                         break;
 533
 534                 case SSL3_ST_SR_KEY_EXCH_A:
 535                 case SSL3_ST_SR_KEY_EXCH_B:
 536                         ret=ssl3_get_client_key_exchange(s);
 537                         if (ret <= 0)
 538                                 goto end;
 539                         if (ret == 2)
 540                                 {
 541                                 /* For the ECDH ciphersuites when
 542                                  * the client sends its ECDH pub key in
 543                                  * a certificate, the CertificateVerify
 544                                  * message is not sent.
 545                                  * Also for GOST ciphersuites when
 546                                  * the client uses its key from the certificate
 547                                  * for key exchange.
 548                                  */
 549                                 s->state=SSL3_ST_SR_FINISHED_A;
 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                         s->state=SSL3_ST_SR_FINISHED_A;
 593                         s->init_num=0;
 594                         break;
 595
 596                 case SSL3_ST_SR_FINISHED_A:
 597                 case SSL3_ST_SR_FINISHED_B:
 598                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 599                                 SSL3_ST_SR_FINISHED_B);
 600                         if (ret <= 0) goto end;
 601 #ifndef OPENSSL_NO_TLSEXT
 602                         if (s->tlsext_ticket_expected)
 603                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 604                         else if (s->hit)
 605                                 s->state=SSL_ST_OK;
 606 #else
 607                         if (s->hit)
 608                                 s->state=SSL_ST_OK;
 609 #endif
 610                         else
 611                                 s->state=SSL3_ST_SW_CHANGE_A;
 612                         s->init_num=0;
 613                         break;
 614
 615 #ifndef OPENSSL_NO_TLSEXT
 616                 case SSL3_ST_SW_SESSION_TICKET_A:
 617                 case SSL3_ST_SW_SESSION_TICKET_B:
 618                         ret=ssl3_send_newsession_ticket(s);
 619                         if (ret <= 0) goto end;
 620                         s->state=SSL3_ST_SW_CHANGE_A;
 621                         s->init_num=0;
 622                         break;
 623
 624                 case SSL3_ST_SW_CERT_STATUS_A:
 625                 case SSL3_ST_SW_CERT_STATUS_B:
 626                         ret=ssl3_send_cert_status(s);
 627                         if (ret <= 0) goto end;
 628                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 629                         s->init_num=0;
 630                         break;
 631
 632 #endif
 633
 634                 case SSL3_ST_SW_CHANGE_A:
 635                 case SSL3_ST_SW_CHANGE_B:
 636
 637                         s->session->cipher=s->s3->tmp.new_cipher;
 638                         if (!s->method->ssl3_enc->setup_key_block(s))
 639                                 { ret= -1; goto end; }
 640
 641                         ret=ssl3_send_change_cipher_spec(s,
 642                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 643
 644                         if (ret <= 0) goto end;
 645                         s->state=SSL3_ST_SW_FINISHED_A;
 646                         s->init_num=0;
 647
 648                         if (!s->method->ssl3_enc->change_cipher_state(s,
 649                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 650                                 {
 651                                 ret= -1;
 652                                 goto end;
 653                                 }
 654
 655                         break;
 656
 657                 case SSL3_ST_SW_FINISHED_A:
 658                 case SSL3_ST_SW_FINISHED_B:
 659                         ret=ssl3_send_finished(s,
 660                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 661                                 s->method->ssl3_enc->server_finished_label,
 662                                 s->method->ssl3_enc->server_finished_label_len);
 663                         if (ret <= 0) goto end;
 664                         s->state=SSL3_ST_SW_FLUSH;
 665                         if (s->hit)
 666                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 667                         else
 668                                 s->s3->tmp.next_state=SSL_ST_OK;
 669                         s->init_num=0;
 670                         break;
 671
 672                 case SSL_ST_OK:
 673                         /* clean a few things up */
 674                         ssl3_cleanup_key_block(s);
 675
 676                         BUF_MEM_free(s->init_buf);
 677                         s->init_buf=NULL;
 678
 679                         /* remove buffering on output */
 680                         ssl_free_wbio_buffer(s);
 681
 682                         s->init_num=0;
 683
 684                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 685                                 {
 686                                 /* actually not necessarily a 'new' session unless
 687                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 688
 689                                 s->new_session=0;
 690
 691                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 692
 693                                 s->ctx->stats.sess_accept_good++;
 694                                 /* s->server=1; */
 695                                 s->handshake_func=ssl3_accept;
 696
 697                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 698                                 }
 699
 700                         ret = 1;
 701                         goto end;
 702                         /* break; */
 703
 704                 default:
 705                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 706                         ret= -1;
 707                         goto end;
 708                         /* break; */
 709                         }
 710
 711                 if (!s->s3->tmp.reuse_message && !skip)
 712                         {
 713                         if (s->debug)
 714                                 {
 715                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 716                                         goto end;
 717                                 }
 718
 719
 720                         if ((cb != NULL) && (s->state != state))
 721                                 {
 722                                 new_state=s->state;
 723                                 s->state=state;
 724                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 725                                 s->state=new_state;
 726                                 }
 727                         }
 728                 skip=0;
 729                 }
 730 end:
 731         /* BIO_flush(s->wbio); */
 732
 733         s->in_handshake--;
 734         if (cb != NULL)
 735                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 736         return(ret);
 737         }
 738
 739 int ssl3_send_hello_request(SSL *s)
 740         {
 741         unsigned char *p;
 742
 743         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 744                 {
 745                 p=(unsigned char *)s->init_buf->data;
 746                 *(p++)=SSL3_MT_HELLO_REQUEST;
 747                 *(p++)=0;
 748                 *(p++)=0;
 749                 *(p++)=0;
 750
 751                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 752                 /* number of bytes to write */
 753                 s->init_num=4;
 754                 s->init_off=0;
 755                 }
 756
 757         /* SSL3_ST_SW_HELLO_REQ_B */
 758         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 759         }
 760
 761 int ssl3_check_client_hello(SSL *s)
 762         {
 763         int ok;
 764         long n;
 765
 766         /* this function is called when we really expect a Certificate message,
 767          * so permit appropriate message length */
 768         n=s->method->ssl_get_message(s,
 769                 SSL3_ST_SR_CERT_A,
 770                 SSL3_ST_SR_CERT_B,
 771                 -1,
 772                 s->max_cert_list,
 773                 &ok);
 774         if (!ok) return((int)n);
 775         s->s3->tmp.reuse_message = 1;
 776         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 777                 {
 778                 /* Throw away what we have done so far in the current handshake,
 779                  * which will now be aborted. (A full SSL_clear would be too much.)
 780                  * I hope that tmp.dh is the only thing that may need to be cleared
 781                  * when a handshake is not completed ... */
 782 #ifndef OPENSSL_NO_DH
 783                 if (s->s3->tmp.dh != NULL)
 784                         {
 785                         DH_free(s->s3->tmp.dh);
 786                         s->s3->tmp.dh = NULL;
 787                         }
 788 #endif
 789                 return 2;
 790                 }
 791         return 1;
 792 }
 793
 794 int ssl3_get_client_hello(SSL *s)
 795         {
 796         int i,j,ok,al,ret= -1;
 797         unsigned int cookie_len;
 798         long n;
 799         unsigned long id;
 800         unsigned char *p,*d,*q;
 801         SSL_CIPHER *c;
 802 #ifndef OPENSSL_NO_COMP
 803         SSL_COMP *comp=NULL;
 804 #endif
 805         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 806
 807         /* We do this so that we will respond with our native type.
 808          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 809          * This down switching should be handled by a different method.
 810          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 811          * TLSv1.
 812          */
 813         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 814                 {
 815                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 816                 }
 817         s->first_packet=1;
 818         n=s->method->ssl_get_message(s,
 819                 SSL3_ST_SR_CLNT_HELLO_B,
 820                 SSL3_ST_SR_CLNT_HELLO_C,
 821                 SSL3_MT_CLIENT_HELLO,
 822                 SSL3_RT_MAX_PLAIN_LENGTH,
 823                 &ok);
 824
 825         if (!ok) return((int)n);
 826         s->first_packet=0;
 827         d=p=(unsigned char *)s->init_msg;
 828
 829         /* use version from inside client hello, not from record header
 830          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 831         s->client_version=(((int)p[0])<<8)|(int)p[1];
 832         p+=2;
 833
 834         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 835             (s->version != DTLS1_VERSION && s->client_version < s->version))
 836                 {
 837                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 838                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 839                         {
 840                         /* similar to ssl3_get_record, send alert using remote version number */
 841                         s->version = s->client_version;
 842                         }
 843                 al = SSL_AD_PROTOCOL_VERSION;
 844                 goto f_err;
 845                 }
 846
 847         /* If we require cookies and this ClientHello doesn't
 848          * contain one, just return since we do not want to
 849          * allocate any memory yet. So check cookie length...
 850          */
 851         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 852                 {
 853                 unsigned int session_length, cookie_length;
 854
 855                 session_length = *(p + SSL3_RANDOM_SIZE);
 856                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 857
 858                 if (cookie_length == 0)
 859                         return 1;
 860                 }
 861
 862         /* load the client random */
 863         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 864         p+=SSL3_RANDOM_SIZE;
 865
 866         /* get the session-id */
 867         j= *(p++);
 868
 869         s->hit=0;
 870         /* Versions before 0.9.7 always allow session reuse during renegotiation
 871          * (i.e. when s->new_session is true), option
 872          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 873          * Maybe this optional behaviour should always have been the default,
 874          * but we cannot safely change the default behaviour (or new applications
 875          * might be written that become totally unsecure when compiled with
 876          * an earlier library version)
 877          */
 878         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 879                 {
 880                 if (!ssl_get_new_session(s,1))
 881                         goto err;
 882                 }
 883         else
 884                 {
 885                 i=ssl_get_prev_session(s, p, j, d + n);
 886                 if (i == 1)
 887                         { /* previous session */
 888                         s->hit=1;
 889                         }
 890                 else if (i == -1)
 891                         goto err;
 892                 else /* i == 0 */
 893                         {
 894                         if (!ssl_get_new_session(s,1))
 895                                 goto err;
 896                         }
 897                 }
 898
 899         p+=j;
 900
 901         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 902                 {
 903                 /* cookie stuff */
 904                 cookie_len = *(p++);
 905
 906                 /*
 907                  * The ClientHello may contain a cookie even if the
 908                  * HelloVerify message has not been sent--make sure that it
 909                  * does not cause an overflow.
 910                  */
 911                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 912                         {
 913                         /* too much data */
 914                         al = SSL_AD_DECODE_ERROR;
 915                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 916                         goto f_err;
 917                         }
 918
 919                 /* verify the cookie if appropriate option is set. */
 920                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 921                         cookie_len > 0)
 922                         {
 923                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 924
 925                         if ( s->ctx->app_verify_cookie_cb != NULL)
 926                                 {
 927                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 928                                         cookie_len) == 0)
 929                                         {
 930                                         al=SSL_AD_HANDSHAKE_FAILURE;
 931                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 932                                                 SSL_R_COOKIE_MISMATCH);
 933                                         goto f_err;
 934                                         }
 935                                 /* else cookie verification succeeded */
 936                                 }
 937                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 938                                                   s->d1->cookie_len) != 0) /* default verification */
 939                                 {
 940                                         al=SSL_AD_HANDSHAKE_FAILURE;
 941                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 942                                                 SSL_R_COOKIE_MISMATCH);
 943                                         goto f_err;
 944                                 }
 945
 946                         ret = 2;
 947                         }
 948
 949                 p += cookie_len;
 950                 }
 951
 952         n2s(p,i);
 953         if ((i == 0) && (j != 0))
 954                 {
 955                 /* we need a cipher if we are not resuming a session */
 956                 al=SSL_AD_ILLEGAL_PARAMETER;
 957                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 958                 goto f_err;
 959                 }
 960         if ((p+i) >= (d+n))
 961                 {
 962                 /* not enough data */
 963                 al=SSL_AD_DECODE_ERROR;
 964                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 965                 goto f_err;
 966                 }
 967         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 968                 == NULL))
 969                 {
 970                 goto err;
 971                 }
 972         p+=i;
 973
 974         /* If it is a hit, check that the cipher is in the list */
 975         if ((s->hit) && (i > 0))
 976                 {
 977                 j=0;
 978                 id=s->session->cipher->id;
 979
 980 #ifdef CIPHER_DEBUG
 981                 printf("client sent %d ciphers\n",sk_num(ciphers));
 982 #endif
 983                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 984                         {
 985                         c=sk_SSL_CIPHER_value(ciphers,i);
 986 #ifdef CIPHER_DEBUG
 987                         printf("client [%2d of %2d]:%s\n",
 988                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 989 #endif
 990                         if (c->id == id)
 991                                 {
 992                                 j=1;
 993                                 break;
 994                                 }
 995                         }
 996                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 997                         {
 998                         /* Special case as client bug workaround: the previously used cipher may
 999                          * not be in the current list, the client instead might be trying to
1000                          * continue using a cipher that before wasn't chosen due to server
1001                          * preferences.  We'll have to reject the connection if the cipher is not
1002                          * enabled, though. */
1003                         c = sk_SSL_CIPHER_value(ciphers, 0);
1004                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1005                                 {
1006                                 s->session->cipher = c;
1007                                 j = 1;
1008                                 }
1009                         }
1010                 if (j == 0)
1011                         {
1012                         /* we need to have the cipher in the cipher
1013                          * list if we are asked to reuse it */
1014                         al=SSL_AD_ILLEGAL_PARAMETER;
1015                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1016                         goto f_err;
1017                         }
1018                 }
1019
1020         /* compression */
1021         i= *(p++);
1022         if ((p+i) > (d+n))
1023                 {
1024                 /* not enough data */
1025                 al=SSL_AD_DECODE_ERROR;
1026                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1027                 goto f_err;
1028                 }
1029         q=p;
1030         for (j=0; j<i; j++)
1031                 {
1032                 if (p[j] == 0) break;
1033                 }
1034
1035         p+=i;
1036         if (j >= i)
1037                 {
1038                 /* no compress */
1039                 al=SSL_AD_DECODE_ERROR;
1040                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1041                 goto f_err;
1042                 }
1043
1044 #ifndef OPENSSL_NO_TLSEXT
1045         /* TLS extensions*/
1046         if (s->version >= SSL3_VERSION)
1047                 {
1048                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1049                         {
1050                         /* 'al' set by ssl_parse_clienthello_tlsext */
1051                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1052                         goto f_err;
1053                         }
1054                 }
1055                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1056                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1057                         goto err;
1058                 }
1059
1060         /* Check if we want to use external pre-shared secret for this
1061          * handshake for not reused session only. We need to generate
1062          * server_random before calling tls_session_secret_cb in order to allow
1063          * SessionTicket processing to use it in key derivation. */
1064         {
1065                 unsigned long Time;
1066                 unsigned char *pos;
1067                 Time=(unsigned long)time(NULL);                 /* Time */
1068                 pos=s->s3->server_random;
1069                 l2n(Time,pos);
1070                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1071                         {
1072                         al=SSL_AD_INTERNAL_ERROR;
1073                         goto f_err;
1074                         }
1075         }
1076
1077         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1078                 {
1079                 SSL_CIPHER *pref_cipher=NULL;
1080
1081                 s->session->master_key_length=sizeof(s->session->master_key);
1082                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1083                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1084                         {
1085                         s->hit=1;
1086                         s->session->ciphers=ciphers;
1087                         s->session->verify_result=X509_V_OK;
1088
1089                         ciphers=NULL;
1090
1091                         /* check if some cipher was preferred by call back */
1092                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1093                         if (pref_cipher == NULL)
1094                                 {
1095                                 al=SSL_AD_HANDSHAKE_FAILURE;
1096                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1097                                 goto f_err;
1098                                 }
1099
1100                         s->session->cipher=pref_cipher;
1101
1102                         if (s->cipher_list)
1103                                 sk_SSL_CIPHER_free(s->cipher_list);
1104
1105                         if (s->cipher_list_by_id)
1106                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1107
1108                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1109                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1110                         }
1111                 }
1112 #endif
1113
1114         /* Worst case, we will use the NULL compression, but if we have other
1115          * options, we will now look for them.  We have i-1 compression
1116          * algorithms from the client, starting at q. */
1117         s->s3->tmp.new_compression=NULL;
1118 #ifndef OPENSSL_NO_COMP
1119         /* This only happens if we have a cache hit */
1120         if (s->session->compress_meth != 0)
1121                 {
1122                 int m, comp_id = s->session->compress_meth;
1123                 /* Perform sanity checks on resumed compression algorithm */
1124                 /* Can't disable compression */
1125                 if (s->options & SSL_OP_NO_COMPRESSION)
1126                         {
1127                         al=SSL_AD_INTERNAL_ERROR;
1128                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1129                         goto f_err;
1130                         }
1131                 /* Look for resumed compression method */
1132                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1133                         {
1134                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1135                         if (comp_id == comp->id)
1136                                 {
1137                                 s->s3->tmp.new_compression=comp;
1138                                 break;
1139                                 }
1140                         }
1141                 if (s->s3->tmp.new_compression == NULL)
1142                         {
1143                         al=SSL_AD_INTERNAL_ERROR;
1144                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1145                         goto f_err;
1146                         }
1147                 /* Look for resumed method in compression list */
1148                 for (m = 0; m < i; m++)
1149                         {
1150                         if (q[m] == comp_id)
1151                                 break;
1152                         }
1153                 if (m >= i)
1154                         {
1155                         al=SSL_AD_ILLEGAL_PARAMETER;
1156                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1157                         goto f_err;
1158                         }
1159                 }
1160         else if (s->hit)
1161                 comp = NULL;
1162         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1163                 { /* See if we have a match */
1164                 int m,nn,o,v,done=0;
1165
1166                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1167                 for (m=0; m<nn; m++)
1168                         {
1169                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1170                         v=comp->id;
1171                         for (o=0; o<i; o++)
1172                                 {
1173                                 if (v == q[o])
1174                                         {
1175                                         done=1;
1176                                         break;
1177                                         }
1178                                 }
1179                         if (done) break;
1180                         }
1181                 if (done)
1182                         s->s3->tmp.new_compression=comp;
1183                 else
1184                         comp=NULL;
1185                 }
1186 #else
1187         /* If compression is disabled we'd better not try to resume a session
1188          * using compression.
1189          */
1190         if (s->session->compress_meth != 0)
1191                 {
1192                 al=SSL_AD_INTERNAL_ERROR;
1193                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1194                 goto f_err;
1195                 }
1196 #endif
1197
1198         /* Given s->session->ciphers and SSL_get_ciphers, we must
1199          * pick a cipher */
1200
1201         if (!s->hit)
1202                 {
1203 #ifdef OPENSSL_NO_COMP
1204                 s->session->compress_meth=0;
1205 #else
1206                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1207 #endif
1208                 if (s->session->ciphers != NULL)
1209                         sk_SSL_CIPHER_free(s->session->ciphers);
1210                 s->session->ciphers=ciphers;
1211                 if (ciphers == NULL)
1212                         {
1213                         al=SSL_AD_ILLEGAL_PARAMETER;
1214                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1215                         goto f_err;
1216                         }
1217                 ciphers=NULL;
1218                 c=ssl3_choose_cipher(s,s->session->ciphers,
1219                                      SSL_get_ciphers(s));
1220
1221                 if (c == NULL)
1222                         {
1223                         al=SSL_AD_HANDSHAKE_FAILURE;
1224                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1225                         goto f_err;
1226                         }
1227                 s->s3->tmp.new_cipher=c;
1228                 }
1229         else
1230                 {
1231                 /* Session-id reuse */
1232 #ifdef REUSE_CIPHER_BUG
1233                 STACK_OF(SSL_CIPHER) *sk;
1234                 SSL_CIPHER *nc=NULL;
1235                 SSL_CIPHER *ec=NULL;
1236
1237                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1238                         {
1239                         sk=s->session->ciphers;
1240                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1241                                 {
1242                                 c=sk_SSL_CIPHER_value(sk,i);
1243                                 if (c->algorithm_enc & SSL_eNULL)
1244                                         nc=c;
1245                                 if (SSL_C_IS_EXPORT(c))
1246                                         ec=c;
1247                                 }
1248                         if (nc != NULL)
1249                                 s->s3->tmp.new_cipher=nc;
1250                         else if (ec != NULL)
1251                                 s->s3->tmp.new_cipher=ec;
1252                         else
1253                                 s->s3->tmp.new_cipher=s->session->cipher;
1254                         }
1255                 else
1256 #endif
1257                 s->s3->tmp.new_cipher=s->session->cipher;
1258                 }
1259
1260         if (!ssl3_digest_cached_records(s))
1261                 goto f_err;
1262
1263         /* we now have the following setup.
1264          * client_random
1265          * cipher_list          - our prefered list of ciphers
1266          * ciphers              - the clients prefered list of ciphers
1267          * compression          - basically ignored right now
1268          * ssl version is set   - sslv3
1269          * s->session           - The ssl session has been setup.
1270          * s->hit               - session reuse flag
1271          * s->tmp.new_cipher    - the new cipher to use.
1272          */
1273
1274         if (ret < 0) ret=1;
1275         if (0)
1276                 {
1277 f_err:
1278                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1279                 }
1280 err:
1281         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1282         return(ret);
1283         }
1284
1285 int ssl3_send_server_hello(SSL *s)
1286         {
1287         unsigned char *buf;
1288         unsigned char *p,*d;
1289         int i,sl;
1290         unsigned long l;
1291 #ifdef OPENSSL_NO_TLSEXT
1292         unsigned long Time;
1293 #endif
1294
1295         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1296                 {
1297                 buf=(unsigned char *)s->init_buf->data;
1298 #ifdef OPENSSL_NO_TLSEXT
1299                 p=s->s3->server_random;
1300                 /* Generate server_random if it was not needed previously */
1301                 Time=(unsigned long)time(NULL);                 /* Time */
1302                 l2n(Time,p);
1303                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1304                         return -1;
1305 #endif
1306                 /* Do the message type and length last */
1307                 d=p= &(buf[4]);
1308
1309                 *(p++)=s->version>>8;
1310                 *(p++)=s->version&0xff;
1311
1312                 /* Random stuff */
1313                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1314                 p+=SSL3_RANDOM_SIZE;
1315
1316                 /* now in theory we have 3 options to sending back the
1317                  * session id.  If it is a re-use, we send back the
1318                  * old session-id, if it is a new session, we send
1319                  * back the new session-id or we send back a 0 length
1320                  * session-id if we want it to be single use.
1321                  * Currently I will not implement the '0' length session-id
1322                  * 12-Jan-98 - I'll now support the '0' length stuff.
1323                  *
1324                  * We also have an additional case where stateless session
1325                  * resumption is successful: we always send back the old
1326                  * session id. In this case s->hit is non zero: this can
1327                  * only happen if stateless session resumption is succesful
1328                  * if session caching is disabled so existing functionality
1329                  * is unaffected.
1330                  */
1331                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1332                         && !s->hit)
1333                         s->session->session_id_length=0;
1334
1335                 sl=s->session->session_id_length;
1336                 if (sl > (int)sizeof(s->session->session_id))
1337                         {
1338                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1339                         return -1;
1340                         }
1341                 *(p++)=sl;
1342                 memcpy(p,s->session->session_id,sl);
1343                 p+=sl;
1344
1345                 /* put the cipher */
1346                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1347                 p+=i;
1348
1349                 /* put the compression method */
1350 #ifdef OPENSSL_NO_COMP
1351                         *(p++)=0;
1352 #else
1353                 if (s->s3->tmp.new_compression == NULL)
1354                         *(p++)=0;
1355                 else
1356                         *(p++)=s->s3->tmp.new_compression->id;
1357 #endif
1358 #ifndef OPENSSL_NO_TLSEXT
1359                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1360                         {
1361                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1362                         return -1;
1363                         }
1364                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1365                         {
1366                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1367                         return -1;
1368                         }
1369 #endif
1370                 /* do the header */
1371                 l=(p-d);
1372                 d=buf;
1373                 *(d++)=SSL3_MT_SERVER_HELLO;
1374                 l2n3(l,d);
1375
1376                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1377                 /* number of bytes to write */
1378                 s->init_num=p-buf;
1379                 s->init_off=0;
1380                 }
1381
1382         /* SSL3_ST_SW_SRVR_HELLO_B */
1383         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1384         }
1385
1386 int ssl3_send_server_done(SSL *s)
1387         {
1388         unsigned char *p;
1389
1390         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1391                 {
1392                 p=(unsigned char *)s->init_buf->data;
1393
1394                 /* do the header */
1395                 *(p++)=SSL3_MT_SERVER_DONE;
1396                 *(p++)=0;
1397                 *(p++)=0;
1398                 *(p++)=0;
1399
1400                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1401                 /* number of bytes to write */
1402                 s->init_num=4;
1403                 s->init_off=0;
1404                 }
1405
1406         /* SSL3_ST_SW_SRVR_DONE_B */
1407         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1408         }
1409
1410 int ssl3_send_server_key_exchange(SSL *s)
1411         {
1412 #ifndef OPENSSL_NO_RSA
1413         unsigned char *q;
1414         int j,num;
1415         RSA *rsa;
1416         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1417         unsigned int u;
1418 #endif
1419 #ifndef OPENSSL_NO_DH
1420         DH *dh=NULL,*dhp;
1421 #endif
1422 #ifndef OPENSSL_NO_ECDH
1423         EC_KEY *ecdh=NULL, *ecdhp;
1424         unsigned char *encodedPoint = NULL;
1425         int encodedlen = 0;
1426         int curve_id = 0;
1427         BN_CTX *bn_ctx = NULL;
1428 #endif
1429         EVP_PKEY *pkey;
1430         unsigned char *p,*d;
1431         int al,i;
1432         unsigned long type;
1433         int n;
1434         CERT *cert;
1435         BIGNUM *r[4];
1436         int nr[4],kn;
1437         BUF_MEM *buf;
1438         EVP_MD_CTX md_ctx;
1439
1440         EVP_MD_CTX_init(&md_ctx);
1441         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1442                 {
1443                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1444                 cert=s->cert;
1445
1446                 buf=s->init_buf;
1447
1448                 r[0]=r[1]=r[2]=r[3]=NULL;
1449                 n=0;
1450 #ifndef OPENSSL_NO_RSA
1451                 if (type & SSL_kRSA)
1452                         {
1453                         rsa=cert->rsa_tmp;
1454                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1455                                 {
1456                                 rsa=s->cert->rsa_tmp_cb(s,
1457                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1458                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1459                                 if(rsa == NULL)
1460                                 {
1461                                         al=SSL_AD_HANDSHAKE_FAILURE;
1462                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1463                                         goto f_err;
1464                                 }
1465                                 RSA_up_ref(rsa);
1466                                 cert->rsa_tmp=rsa;
1467                                 }
1468                         if (rsa == NULL)
1469                                 {
1470                                 al=SSL_AD_HANDSHAKE_FAILURE;
1471                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1472                                 goto f_err;
1473                                 }
1474                         r[0]=rsa->n;
1475                         r[1]=rsa->e;
1476                         s->s3->tmp.use_rsa_tmp=1;
1477                         }
1478                 else
1479 #endif
1480 #ifndef OPENSSL_NO_DH
1481                         if (type & SSL_kEDH)
1482                         {
1483                         dhp=cert->dh_tmp;
1484                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1485                                 dhp=s->cert->dh_tmp_cb(s,
1486                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1487                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1488                         if (dhp == NULL)
1489                                 {
1490                                 al=SSL_AD_HANDSHAKE_FAILURE;
1491                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1492                                 goto f_err;
1493                                 }
1494
1495                         if (s->s3->tmp.dh != NULL)
1496                                 {
1497                                 DH_free(dh);
1498                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1499                                 goto err;
1500                                 }
1501
1502                         if ((dh=DHparams_dup(dhp)) == NULL)
1503                                 {
1504                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1505                                 goto err;
1506                                 }
1507
1508                         s->s3->tmp.dh=dh;
1509                         if ((dhp->pub_key == NULL ||
1510                              dhp->priv_key == NULL ||
1511                              (s->options & SSL_OP_SINGLE_DH_USE)))
1512                                 {
1513                                 if(!DH_generate_key(dh))
1514                                     {
1515                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1516                                            ERR_R_DH_LIB);
1517                                     goto err;
1518                                     }
1519                                 }
1520                         else
1521                                 {
1522                                 dh->pub_key=BN_dup(dhp->pub_key);
1523                                 dh->priv_key=BN_dup(dhp->priv_key);
1524                                 if ((dh->pub_key == NULL) ||
1525                                         (dh->priv_key == NULL))
1526                                         {
1527                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1528                                         goto err;
1529                                         }
1530                                 }
1531                         r[0]=dh->p;
1532                         r[1]=dh->g;
1533                         r[2]=dh->pub_key;
1534                         }
1535                 else
1536 #endif
1537 #ifndef OPENSSL_NO_ECDH
1538                         if (type & SSL_kEECDH)
1539                         {
1540                         const EC_GROUP *group;
1541
1542                         ecdhp=cert->ecdh_tmp;
1543                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1544                                 {
1545                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1546                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1547                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1548                                 }
1549                         if (ecdhp == NULL)
1550                                 {
1551                                 al=SSL_AD_HANDSHAKE_FAILURE;
1552                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1553                                 goto f_err;
1554                                 }
1555
1556                         if (s->s3->tmp.ecdh != NULL)
1557                                 {
1558                                 EC_KEY_free(s->s3->tmp.ecdh);
1559                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1560                                 goto err;
1561                                 }
1562
1563                         /* Duplicate the ECDH structure. */
1564                         if (ecdhp == NULL)
1565                                 {
1566                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1567                                 goto err;
1568                                 }
1569                         if (!EC_KEY_up_ref(ecdhp))
1570                                 {
1571                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1572                                 goto err;
1573                                 }
1574                         ecdh = ecdhp;
1575
1576                         s->s3->tmp.ecdh=ecdh;
1577                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1578                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1579                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1580                                 {
1581                                 if(!EC_KEY_generate_key(ecdh))
1582                                     {
1583                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1584                                     goto err;
1585                                     }
1586                                 }
1587
1588                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1589                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1590                             (EC_KEY_get0_private_key(ecdh) == NULL))
1591                                 {
1592                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1593                                 goto err;
1594                                 }
1595
1596                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1597                             (EC_GROUP_get_degree(group) > 163))
1598                                 {
1599                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1600                                 goto err;
1601                                 }
1602
1603                         /* XXX: For now, we only support ephemeral ECDH
1604                          * keys over named (not generic) curves. For
1605                          * supported named curves, curve_id is non-zero.
1606                          */
1607                         if ((curve_id =
1608                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1609                             == 0)
1610                                 {
1611                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1612                                 goto err;
1613                                 }
1614
1615                         /* Encode the public key.
1616                          * First check the size of encoding and
1617                          * allocate memory accordingly.
1618                          */
1619                         encodedlen = EC_POINT_point2oct(group,
1620                             EC_KEY_get0_public_key(ecdh),
1621                             POINT_CONVERSION_UNCOMPRESSED,
1622                             NULL, 0, NULL);
1623
1624                         encodedPoint = (unsigned char *)
1625                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1626                         bn_ctx = BN_CTX_new();
1627                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1628                                 {
1629                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1630                                 goto err;
1631                                 }
1632
1633
1634                         encodedlen = EC_POINT_point2oct(group,
1635                             EC_KEY_get0_public_key(ecdh),
1636                             POINT_CONVERSION_UNCOMPRESSED,
1637                             encodedPoint, encodedlen, bn_ctx);
1638
1639                         if (encodedlen == 0)
1640                                 {
1641                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1642                                 goto err;
1643                                 }
1644
1645                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1646
1647                         /* XXX: For now, we only support named (not
1648                          * generic) curves in ECDH ephemeral key exchanges.
1649                          * In this situation, we need four additional bytes
1650                          * to encode the entire ServerECDHParams
1651                          * structure.
1652                          */
1653                         n = 4 + encodedlen;
1654
1655                         /* We'll generate the serverKeyExchange message
1656                          * explicitly so we can set these to NULLs
1657                          */
1658                         r[0]=NULL;
1659                         r[1]=NULL;
1660                         r[2]=NULL;
1661                         r[3]=NULL;
1662                         }
1663                 else
1664 #endif /* !OPENSSL_NO_ECDH */
1665 #ifndef OPENSSL_NO_PSK
1666                         if (type & SSL_kPSK)
1667                                 {
1668                                 /* reserve size for record length and PSK identity hint*/
1669                                 n+=2+strlen(s->ctx->psk_identity_hint);
1670                                 }
1671                         else
1672 #endif /* !OPENSSL_NO_PSK */
1673                         {
1674                         al=SSL_AD_HANDSHAKE_FAILURE;
1675                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1676                         goto f_err;
1677                         }
1678                 for (i=0; r[i] != NULL; i++)
1679                         {
1680                         nr[i]=BN_num_bytes(r[i]);
1681                         n+=2+nr[i];
1682                         }
1683
1684                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1685                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1686                         {
1687                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1688                                 == NULL)
1689                                 {
1690                                 al=SSL_AD_DECODE_ERROR;
1691                                 goto f_err;
1692                                 }
1693                         kn=EVP_PKEY_size(pkey);
1694                         }
1695                 else
1696                         {
1697                         pkey=NULL;
1698                         kn=0;
1699                         }
1700
1701                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1702                         {
1703                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1704                         goto err;
1705                         }
1706                 d=(unsigned char *)s->init_buf->data;
1707                 p= &(d[4]);
1708
1709                 for (i=0; r[i] != NULL; i++)
1710                         {
1711                         s2n(nr[i],p);
1712                         BN_bn2bin(r[i],p);
1713                         p+=nr[i];
1714                         }
1715
1716 #ifndef OPENSSL_NO_ECDH
1717                 if (type & SSL_kEECDH)
1718                         {
1719                         /* XXX: For now, we only support named (not generic) curves.
1720                          * In this situation, the serverKeyExchange message has:
1721                          * [1 byte CurveType], [2 byte CurveName]
1722                          * [1 byte length of encoded point], followed by
1723                          * the actual encoded point itself
1724                          */
1725                         *p = NAMED_CURVE_TYPE;
1726                         p += 1;
1727                         *p = 0;
1728                         p += 1;
1729                         *p = curve_id;
1730                         p += 1;
1731                         *p = encodedlen;
1732                         p += 1;
1733                         memcpy((unsigned char*)p,
1734                             (unsigned char *)encodedPoint,
1735                             encodedlen);
1736                         OPENSSL_free(encodedPoint);
1737                         p += encodedlen;
1738                         }
1739 #endif
1740
1741 #ifndef OPENSSL_NO_PSK
1742                 if (type & SSL_kPSK)
1743                         {
1744                         /* copy PSK identity hint */
1745                         s2n(strlen(s->ctx->psk_identity_hint), p);
1746                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1747                         p+=strlen(s->ctx->psk_identity_hint);
1748                         }
1749 #endif
1750
1751                 /* not anonymous */
1752                 if (pkey != NULL)
1753                         {
1754                         /* n is the length of the params, they start at &(d[4])
1755                          * and p points to the space at the end. */
1756 #ifndef OPENSSL_NO_RSA
1757                         if (pkey->type == EVP_PKEY_RSA)
1758                                 {
1759                                 q=md_buf;
1760                                 j=0;
1761                                 for (num=2; num > 0; num--)
1762                                         {
1763                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1764                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1765                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1766                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1767                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1768                                         EVP_DigestFinal_ex(&md_ctx,q,
1769                                                 (unsigned int *)&i);
1770                                         q+=i;
1771                                         j+=i;
1772                                         }
1773                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1774                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1775                                         {
1776                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1777                                         goto err;
1778                                         }
1779                                 s2n(u,p);
1780                                 n+=u+2;
1781                                 }
1782                         else
1783 #endif
1784 #if !defined(OPENSSL_NO_DSA)
1785                                 if (pkey->type == EVP_PKEY_DSA)
1786                                 {
1787                                 /* lets do DSS */
1788                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1789                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1790                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1791                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1792                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1793                                         (unsigned int *)&i,pkey))
1794                                         {
1795                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1796                                         goto err;
1797                                         }
1798                                 s2n(i,p);
1799                                 n+=i+2;
1800                                 }
1801                         else
1802 #endif
1803 #if !defined(OPENSSL_NO_ECDSA)
1804                                 if (pkey->type == EVP_PKEY_EC)
1805                                 {
1806                                 /* let's do ECDSA */
1807                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1808                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1809                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1810                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1811                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1812                                         (unsigned int *)&i,pkey))
1813                                         {
1814                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1815                                         goto err;
1816                                         }
1817                                 s2n(i,p);
1818                                 n+=i+2;
1819                                 }
1820                         else
1821 #endif
1822                                 {
1823                                 /* Is this error check actually needed? */
1824                                 al=SSL_AD_HANDSHAKE_FAILURE;
1825                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1826                                 goto f_err;
1827                                 }
1828                         }
1829
1830                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1831                 l2n3(n,d);
1832
1833                 /* we should now have things packed up, so lets send
1834                  * it off */
1835                 s->init_num=n+4;
1836                 s->init_off=0;
1837                 }
1838
1839         s->state = SSL3_ST_SW_KEY_EXCH_B;
1840         EVP_MD_CTX_cleanup(&md_ctx);
1841         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1842 f_err:
1843         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1844 err:
1845 #ifndef OPENSSL_NO_ECDH
1846         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1847         BN_CTX_free(bn_ctx);
1848 #endif
1849         EVP_MD_CTX_cleanup(&md_ctx);
1850         return(-1);
1851         }
1852
1853 int ssl3_send_certificate_request(SSL *s)
1854         {
1855         unsigned char *p,*d;
1856         int i,j,nl,off,n;
1857         STACK_OF(X509_NAME) *sk=NULL;
1858         X509_NAME *name;
1859         BUF_MEM *buf;
1860
1861         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1862                 {
1863                 buf=s->init_buf;
1864
1865                 d=p=(unsigned char *)&(buf->data[4]);
1866
1867                 /* get the list of acceptable cert types */
1868                 p++;
1869                 n=ssl3_get_req_cert_type(s,p);
1870                 d[0]=n;
1871                 p+=n;
1872                 n++;
1873
1874                 off=n;
1875                 p+=2;
1876                 n+=2;
1877
1878                 sk=SSL_get_client_CA_list(s);
1879                 nl=0;
1880                 if (sk != NULL)
1881                         {
1882                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1883                                 {
1884                                 name=sk_X509_NAME_value(sk,i);
1885                                 j=i2d_X509_NAME(name,NULL);
1886                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1887                                         {
1888                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1889                                         goto err;
1890                                         }
1891                                 p=(unsigned char *)&(buf->data[4+n]);
1892                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1893                                         {
1894                                         s2n(j,p);
1895                                         i2d_X509_NAME(name,&p);
1896                                         n+=2+j;
1897                                         nl+=2+j;
1898                                         }
1899                                 else
1900                                         {
1901                                         d=p;
1902                                         i2d_X509_NAME(name,&p);
1903                                         j-=2; s2n(j,d); j+=2;
1904                                         n+=j;
1905                                         nl+=j;
1906                                         }
1907                                 }
1908                         }
1909                 /* else no CA names */
1910                 p=(unsigned char *)&(buf->data[4+off]);
1911                 s2n(nl,p);
1912
1913                 d=(unsigned char *)buf->data;
1914                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1915                 l2n3(n,d);
1916
1917                 /* we should now have things packed up, so lets send
1918                  * it off */
1919
1920                 s->init_num=n+4;
1921                 s->init_off=0;
1922 #ifdef NETSCAPE_HANG_BUG
1923                 p=(unsigned char *)s->init_buf->data + s->init_num;
1924
1925                 /* do the header */
1926                 *(p++)=SSL3_MT_SERVER_DONE;
1927                 *(p++)=0;
1928                 *(p++)=0;
1929                 *(p++)=0;
1930                 s->init_num += 4;
1931 #endif
1932
1933                 s->state = SSL3_ST_SW_CERT_REQ_B;
1934                 }
1935
1936         /* SSL3_ST_SW_CERT_REQ_B */
1937         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1938 err:
1939         return(-1);
1940         }
1941
1942 int ssl3_get_client_key_exchange(SSL *s)
1943         {
1944         int i,al,ok;
1945         long n;
1946         unsigned long alg_k;
1947         unsigned char *p;
1948 #ifndef OPENSSL_NO_RSA
1949         RSA *rsa=NULL;
1950         EVP_PKEY *pkey=NULL;
1951 #endif
1952 #ifndef OPENSSL_NO_DH
1953         BIGNUM *pub=NULL;
1954         DH *dh_srvr;
1955 #endif
1956 #ifndef OPENSSL_NO_KRB5
1957         KSSL_ERR kssl_err;
1958 #endif /* OPENSSL_NO_KRB5 */
1959
1960 #ifndef OPENSSL_NO_ECDH
1961         EC_KEY *srvr_ecdh = NULL;
1962         EVP_PKEY *clnt_pub_pkey = NULL;
1963         EC_POINT *clnt_ecpoint = NULL;
1964         BN_CTX *bn_ctx = NULL;
1965 #endif
1966
1967         n=s->method->ssl_get_message(s,
1968                 SSL3_ST_SR_KEY_EXCH_A,
1969                 SSL3_ST_SR_KEY_EXCH_B,
1970                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1971                 2048, /* ??? */
1972                 &ok);
1973
1974         if (!ok) return((int)n);
1975         p=(unsigned char *)s->init_msg;
1976
1977         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1978
1979 #ifndef OPENSSL_NO_RSA
1980         if (alg_k & SSL_kRSA)
1981                 {
1982                 /* FIX THIS UP EAY EAY EAY EAY */
1983                 if (s->s3->tmp.use_rsa_tmp)
1984                         {
1985                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1986                                 rsa=s->cert->rsa_tmp;
1987                         /* Don't do a callback because rsa_tmp should
1988                          * be sent already */
1989                         if (rsa == NULL)
1990                                 {
1991                                 al=SSL_AD_HANDSHAKE_FAILURE;
1992                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1993                                 goto f_err;
1994
1995                                 }
1996                         }
1997                 else
1998                         {
1999                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2000                         if (    (pkey == NULL) ||
2001                                 (pkey->type != EVP_PKEY_RSA) ||
2002                                 (pkey->pkey.rsa == NULL))
2003                                 {
2004                                 al=SSL_AD_HANDSHAKE_FAILURE;
2005                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2006                                 goto f_err;
2007                                 }
2008                         rsa=pkey->pkey.rsa;
2009                         }
2010
2011                 /* TLS and [incidentally] DTLS{0xFEFF} */
2012                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2013                         {
2014                         n2s(p,i);
2015                         if (n != i+2)
2016                                 {
2017                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2018                                         {
2019                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2020                                         goto err;
2021                                         }
2022                                 else
2023                                         p-=2;
2024                                 }
2025                         else
2026                                 n=i;
2027                         }
2028
2029                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2030
2031                 al = -1;
2032
2033                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2034                         {
2035                         al=SSL_AD_DECODE_ERROR;
2036                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2037                         }
2038
2039                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2040                         {
2041                         /* The premaster secret must contain the same version number as the
2042                          * ClientHello to detect version rollback attacks (strangely, the
2043                          * protocol does not offer such protection for DH ciphersuites).
2044                          * However, buggy clients exist that send the negotiated protocol
2045                          * version instead if the server does not support the requested
2046                          * protocol version.
2047                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2048                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2049                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2050                                 {
2051                                 al=SSL_AD_DECODE_ERROR;
2052                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2053
2054                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2055                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2056                                  * number check as a "bad version oracle" -- an alert would
2057                                  * reveal that the plaintext corresponding to some ciphertext
2058                                  * made up by the adversary is properly formatted except
2059                                  * that the version number is wrong.  To avoid such attacks,
2060                                  * we should treat this just like any other decryption error. */
2061                                 }
2062                         }
2063
2064                 if (al != -1)
2065                         {
2066                         /* Some decryption failure -- use random value instead as countermeasure
2067                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2068                          * (see RFC 2246, section 7.4.7.1). */
2069                         ERR_clear_error();
2070                         i = SSL_MAX_MASTER_KEY_LENGTH;
2071                         p[0] = s->client_version >> 8;
2072                         p[1] = s->client_version & 0xff;
2073                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2074                                 goto err;
2075                         }
2076
2077                 s->session->master_key_length=
2078                         s->method->ssl3_enc->generate_master_secret(s,
2079                                 s->session->master_key,
2080                                 p,i);
2081                 OPENSSL_cleanse(p,i);
2082                 }
2083         else
2084 #endif
2085 #ifndef OPENSSL_NO_DH
2086                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2087                 {
2088                 n2s(p,i);
2089                 if (n != i+2)
2090                         {
2091                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2092                                 {
2093                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2094                                 goto err;
2095                                 }
2096                         else
2097                                 {
2098                                 p-=2;
2099                                 i=(int)n;
2100                                 }
2101                         }
2102
2103                 if (n == 0L) /* the parameters are in the cert */
2104                         {
2105                         al=SSL_AD_HANDSHAKE_FAILURE;
2106                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2107                         goto f_err;
2108                         }
2109                 else
2110                         {
2111                         if (s->s3->tmp.dh == NULL)
2112                                 {
2113                                 al=SSL_AD_HANDSHAKE_FAILURE;
2114                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2115                                 goto f_err;
2116                                 }
2117                         else
2118                                 dh_srvr=s->s3->tmp.dh;
2119                         }
2120
2121                 pub=BN_bin2bn(p,i,NULL);
2122                 if (pub == NULL)
2123                         {
2124                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2125                         goto err;
2126                         }
2127
2128                 i=DH_compute_key(p,pub,dh_srvr);
2129
2130                 if (i <= 0)
2131                         {
2132                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2133                         goto err;
2134                         }
2135
2136                 DH_free(s->s3->tmp.dh);
2137                 s->s3->tmp.dh=NULL;
2138
2139                 BN_clear_free(pub);
2140                 pub=NULL;
2141                 s->session->master_key_length=
2142                         s->method->ssl3_enc->generate_master_secret(s,
2143                                 s->session->master_key,p,i);
2144                 OPENSSL_cleanse(p,i);
2145                 }
2146         else
2147 #endif
2148 #ifndef OPENSSL_NO_KRB5
2149         if (alg_k & SSL_kKRB5)
2150                 {
2151                 krb5_error_code         krb5rc;
2152                 krb5_data               enc_ticket;
2153                 krb5_data               authenticator;
2154                 krb5_data               enc_pms;
2155                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2156                 EVP_CIPHER_CTX          ciph_ctx;
2157                 const EVP_CIPHER        *enc = NULL;
2158                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2159                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2160                                                + EVP_MAX_BLOCK_LENGTH];
2161                 int                  padl, outl;
2162                 krb5_timestamp          authtime = 0;
2163                 krb5_ticket_times       ttimes;
2164
2165                 EVP_CIPHER_CTX_init(&ciph_ctx);
2166
2167                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2168
2169                 n2s(p,i);
2170                 enc_ticket.length = i;
2171
2172                 if (n < (long)(enc_ticket.length + 6))
2173                         {
2174                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2175                                 SSL_R_DATA_LENGTH_TOO_LONG);
2176                         goto err;
2177                         }
2178
2179                 enc_ticket.data = (char *)p;
2180                 p+=enc_ticket.length;
2181
2182                 n2s(p,i);
2183                 authenticator.length = i;
2184
2185                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2186                         {
2187                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2188                                 SSL_R_DATA_LENGTH_TOO_LONG);
2189                         goto err;
2190                         }
2191
2192                 authenticator.data = (char *)p;
2193                 p+=authenticator.length;
2194
2195                 n2s(p,i);
2196                 enc_pms.length = i;
2197                 enc_pms.data = (char *)p;
2198                 p+=enc_pms.length;
2199
2200                 /* Note that the length is checked again below,
2201                 ** after decryption
2202                 */
2203                 if(enc_pms.length > sizeof pms)
2204                         {
2205                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2206                                SSL_R_DATA_LENGTH_TOO_LONG);
2207                         goto err;
2208                         }
2209
2210                 if (n != (long)(enc_ticket.length + authenticator.length +
2211                                                 enc_pms.length + 6))
2212                         {
2213                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2214                                 SSL_R_DATA_LENGTH_TOO_LONG);
2215                         goto err;
2216                         }
2217
2218                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2219                                         &kssl_err)) != 0)
2220                         {
2221 #ifdef KSSL_DEBUG
2222                         printf("kssl_sget_tkt rtn %d [%d]\n",
2223                                 krb5rc, kssl_err.reason);
2224                         if (kssl_err.text)
2225                                 printf("kssl_err text= %s\n", kssl_err.text);
2226 #endif  /* KSSL_DEBUG */
2227                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2228                                 kssl_err.reason);
2229                         goto err;
2230                         }
2231
2232                 /*  Note: no authenticator is not considered an error,
2233                 **  but will return authtime == 0.
2234                 */
2235                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2236                                         &authtime, &kssl_err)) != 0)
2237                         {
2238 #ifdef KSSL_DEBUG
2239                         printf("kssl_check_authent rtn %d [%d]\n",
2240                                 krb5rc, kssl_err.reason);
2241                         if (kssl_err.text)
2242                                 printf("kssl_err text= %s\n", kssl_err.text);
2243 #endif  /* KSSL_DEBUG */
2244                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2245                                 kssl_err.reason);
2246                         goto err;
2247                         }
2248
2249                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2250                         {
2251                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2252                         goto err;
2253                         }
2254
2255 #ifdef KSSL_DEBUG
2256                 kssl_ctx_show(kssl_ctx);
2257 #endif  /* KSSL_DEBUG */
2258
2259                 enc = kssl_map_enc(kssl_ctx->enctype);
2260                 if (enc == NULL)
2261                     goto err;
2262
2263                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2264
2265                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2266                         {
2267                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2268                                 SSL_R_DECRYPTION_FAILED);
2269                         goto err;
2270                         }
2271                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2272                                         (unsigned char *)enc_pms.data, enc_pms.length))
2273                         {
2274                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2275                                 SSL_R_DECRYPTION_FAILED);
2276                         goto err;
2277                         }
2278                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2279                         {
2280                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2281                                 SSL_R_DATA_LENGTH_TOO_LONG);
2282                         goto err;
2283                         }
2284                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2285                         {
2286                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2287                                 SSL_R_DECRYPTION_FAILED);
2288                         goto err;
2289                         }
2290                 outl += padl;
2291                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2292                         {
2293                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2294                                 SSL_R_DATA_LENGTH_TOO_LONG);
2295                         goto err;
2296                         }
2297                 if (!((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2298                     {
2299                     /* The premaster secret must contain the same version number as the
2300                      * ClientHello to detect version rollback attacks (strangely, the
2301                      * protocol does not offer such protection for DH ciphersuites).
2302                      * However, buggy clients exist that send random bytes instead of
2303                      * the protocol version.
2304                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2305                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2306                      */
2307                     if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2308                            (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2309                         {
2310                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2311                                SSL_AD_DECODE_ERROR);
2312                         goto err;
2313                         }
2314                     }
2315
2316                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2317
2318                 s->session->master_key_length=
2319                         s->method->ssl3_enc->generate_master_secret(s,
2320                                 s->session->master_key, pms, outl);
2321
2322                 if (kssl_ctx->client_princ)
2323                         {
2324                         size_t len = strlen(kssl_ctx->client_princ);
2325                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2326                                 {
2327                                 s->session->krb5_client_princ_len = len;
2328                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2329                                 }
2330                         }
2331
2332
2333                 /*  Was doing kssl_ctx_free() here,
2334                 **  but it caused problems for apache.
2335                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2336                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2337                 */
2338                 }
2339         else
2340 #endif  /* OPENSSL_NO_KRB5 */
2341
2342 #ifndef OPENSSL_NO_ECDH
2343                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2344                 {
2345                 int ret = 1;
2346                 int field_size = 0;
2347                 const EC_KEY   *tkey;
2348                 const EC_GROUP *group;
2349                 const BIGNUM *priv_key;
2350
2351                 /* initialize structures for server's ECDH key pair */
2352                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2353                         {
2354                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2355                             ERR_R_MALLOC_FAILURE);
2356                         goto err;
2357                         }
2358
2359                 /* Let's get server private key and group information */
2360                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2361                         {
2362                         /* use the certificate */
2363                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2364                         }
2365                 else
2366                         {
2367                         /* use the ephermeral values we saved when
2368                          * generating the ServerKeyExchange msg.
2369                          */
2370                         tkey = s->s3->tmp.ecdh;
2371                         }
2372
2373                 group    = EC_KEY_get0_group(tkey);
2374                 priv_key = EC_KEY_get0_private_key(tkey);
2375
2376                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2377                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2378                         {
2379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2380                                ERR_R_EC_LIB);
2381                         goto err;
2382                         }
2383
2384                 /* Let's get client's public key */
2385                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2386                         {
2387                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2388                             ERR_R_MALLOC_FAILURE);
2389                         goto err;
2390                         }
2391
2392                 if (n == 0L)
2393                         {
2394                         /* Client Publickey was in Client Certificate */
2395
2396                          if (alg_k & SSL_kEECDH)
2397                                  {
2398                                  al=SSL_AD_HANDSHAKE_FAILURE;
2399                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2400                                  goto f_err;
2401                                  }
2402                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2403                             == NULL) ||
2404                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2405                                 {
2406                                 /* XXX: For now, we do not support client
2407                                  * authentication using ECDH certificates
2408                                  * so this branch (n == 0L) of the code is
2409                                  * never executed. When that support is
2410                                  * added, we ought to ensure the key
2411                                  * received in the certificate is
2412                                  * authorized for key agreement.
2413                                  * ECDH_compute_key implicitly checks that
2414                                  * the two ECDH shares are for the same
2415                                  * group.
2416                                  */
2417                                 al=SSL_AD_HANDSHAKE_FAILURE;
2418                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2419                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2420                                 goto f_err;
2421                                 }
2422
2423                         if (EC_POINT_copy(clnt_ecpoint,
2424                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2425                                 {
2426                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2427                                         ERR_R_EC_LIB);
2428                                 goto err;
2429                                 }
2430                         ret = 2; /* Skip certificate verify processing */
2431                         }
2432                 else
2433                         {
2434                         /* Get client's public key from encoded point
2435                          * in the ClientKeyExchange message.
2436                          */
2437                         if ((bn_ctx = BN_CTX_new()) == NULL)
2438                                 {
2439                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2440                                     ERR_R_MALLOC_FAILURE);
2441                                 goto err;
2442                                 }
2443
2444                         /* Get encoded point length */
2445                         i = *p;
2446                         p += 1;
2447                         if (EC_POINT_oct2point(group,
2448                             clnt_ecpoint, p, i, bn_ctx) == 0)
2449                                 {
2450                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                     ERR_R_EC_LIB);
2452                                 goto err;
2453                                 }
2454                         /* p is pointing to somewhere in the buffer
2455                          * currently, so set it to the start
2456                          */
2457                         p=(unsigned char *)s->init_buf->data;
2458                         }
2459
2460                 /* Compute the shared pre-master secret */
2461                 field_size = EC_GROUP_get_degree(group);
2462                 if (field_size <= 0)
2463                         {
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                ERR_R_ECDH_LIB);
2466                         goto err;
2467                         }
2468                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2469                 if (i <= 0)
2470                         {
2471                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2472                             ERR_R_ECDH_LIB);
2473                         goto err;
2474                         }
2475
2476                 EVP_PKEY_free(clnt_pub_pkey);
2477                 EC_POINT_free(clnt_ecpoint);
2478                 EC_KEY_free(srvr_ecdh);
2479                 BN_CTX_free(bn_ctx);
2480                 EC_KEY_free(s->s3->tmp.ecdh);
2481                 s->s3->tmp.ecdh = NULL;
2482
2483                 /* Compute the master secret */
2484                 s->session->master_key_length = s->method->ssl3_enc-> \
2485                     generate_master_secret(s, s->session->master_key, p, i);
2486
2487                 OPENSSL_cleanse(p, i);
2488                 return (ret);
2489                 }
2490         else
2491 #endif
2492 #ifndef OPENSSL_NO_PSK
2493                 if (alg_k & SSL_kPSK)
2494                         {
2495                         unsigned char *t = NULL;
2496                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2497                         unsigned int pre_ms_len = 0, psk_len = 0;
2498                         int psk_err = 1;
2499                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2500
2501                         al=SSL_AD_HANDSHAKE_FAILURE;
2502
2503                         n2s(p,i);
2504                         if (n != i+2)
2505                                 {
2506                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2507                                         SSL_R_LENGTH_MISMATCH);
2508                                 goto psk_err;
2509                                 }
2510                         if (i > PSK_MAX_IDENTITY_LEN)
2511                                 {
2512                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2513                                         SSL_R_DATA_LENGTH_TOO_LONG);
2514                                 goto psk_err;
2515                                 }
2516                         if (s->psk_server_callback == NULL)
2517                                 {
2518                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2519                                        SSL_R_PSK_NO_SERVER_CB);
2520                                 goto psk_err;
2521                                 }
2522
2523                         /* Create guaranteed NULL-terminated identity
2524                          * string for the callback */
2525                         memcpy(tmp_id, p, i);
2526                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2527                         psk_len = s->psk_server_callback(s, tmp_id,
2528                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2529                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2530
2531                         if (psk_len > PSK_MAX_PSK_LEN)
2532                                 {
2533                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2534                                         ERR_R_INTERNAL_ERROR);
2535                                 goto psk_err;
2536                                 }
2537                         else if (psk_len == 0)
2538                                 {
2539                                 /* PSK related to the given identity not found */
2540                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2541                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2542                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2543                                 goto psk_err;
2544                                 }
2545
2546                         /* create PSK pre_master_secret */
2547                         pre_ms_len=2+psk_len+2+psk_len;
2548                         t = psk_or_pre_ms;
2549                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2550                         s2n(psk_len, t);
2551                         memset(t, 0, psk_len);
2552                         t+=psk_len;
2553                         s2n(psk_len, t);
2554
2555                         if (s->session->psk_identity != NULL)
2556                                 OPENSSL_free(s->session->psk_identity);
2557                         s->session->psk_identity = BUF_strdup((char *)p);
2558                         if (s->session->psk_identity == NULL)
2559                                 {
2560                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2561                                         ERR_R_MALLOC_FAILURE);
2562                                 goto psk_err;
2563                                 }
2564
2565                         if (s->session->psk_identity_hint != NULL)
2566                                 OPENSSL_free(s->session->psk_identity_hint);
2567                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2568                         if (s->ctx->psk_identity_hint != NULL &&
2569                                 s->session->psk_identity_hint == NULL)
2570                                 {
2571                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2572                                         ERR_R_MALLOC_FAILURE);
2573                                 goto psk_err;
2574                                 }
2575
2576                         s->session->master_key_length=
2577                                 s->method->ssl3_enc->generate_master_secret(s,
2578                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2579                         psk_err = 0;
2580                 psk_err:
2581                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2582                         if (psk_err != 0)
2583                                 goto f_err;
2584                         }
2585                 else
2586 #endif
2587                 if (alg_k & SSL_kGOST)
2588                         {
2589                         int ret = 0;
2590                         EVP_PKEY_CTX *pkey_ctx;
2591                         EVP_PKEY *client_pub_pkey = NULL;
2592                         unsigned char premaster_secret[32], *start;
2593                         size_t outlen=32, inlen;
2594
2595                         /* Get our certificate private key*/
2596                         pkey_ctx = EVP_PKEY_CTX_new(s->cert->key->privatekey,NULL);
2597                         EVP_PKEY_decrypt_init(pkey_ctx);
2598                         /* If client certificate is present and is of the same type, maybe
2599                          * use it for key exchange.  Don't mind errors from
2600                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2601                          * a client certificate for authorization only. */
2602                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2603                         if (client_pub_pkey)
2604                                 {
2605                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2606                                         ERR_clear_error();
2607                                 }
2608                         /* Decrypt session key */
2609                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2610                                 {
2611                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2612                                 goto gerr;
2613                                 }
2614                         if (p[1] == 0x81)
2615                                 {
2616                                 start = p+3;
2617                                 inlen = p[2];
2618                                 }
2619                         else if (p[1] < 0x80)
2620                                 {
2621                                 start = p+2;
2622                                 inlen = p[1];
2623                                 }
2624                         else
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2627                                 goto gerr;
2628                                 }
2629                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2630
2631                                 {
2632                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2633                                 goto gerr;
2634                                 }
2635                         /* Generate master secret */
2636                         s->session->master_key_length=
2637                                 s->method->ssl3_enc->generate_master_secret(s,
2638                                         s->session->master_key,premaster_secret,32);
2639                         /* Check if pubkey from client certificate was used */
2640                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2641                                 ret = 2;
2642                         else
2643                                 ret = 1;
2644                 gerr:
2645                         EVP_PKEY_free(client_pub_pkey);
2646                         EVP_PKEY_CTX_free(pkey_ctx);
2647                         if (ret)
2648                                 return ret;
2649                         else
2650                                 goto err;
2651                         }
2652                 else
2653                 {
2654                 al=SSL_AD_HANDSHAKE_FAILURE;
2655                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2656                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2657                 goto f_err;
2658                 }
2659
2660         return(1);
2661 f_err:
2662         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2663 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2664 err:
2665 #endif
2666 #ifndef OPENSSL_NO_ECDH
2667         EVP_PKEY_free(clnt_pub_pkey);
2668         EC_POINT_free(clnt_ecpoint);
2669         if (srvr_ecdh != NULL)
2670                 EC_KEY_free(srvr_ecdh);
2671         BN_CTX_free(bn_ctx);
2672 #endif
2673         return(-1);
2674         }
2675
2676 int ssl3_get_cert_verify(SSL *s)
2677         {
2678         EVP_PKEY *pkey=NULL;
2679         unsigned char *p;
2680         int al,ok,ret=0;
2681         long n;
2682         int type=0,i,j;
2683         X509 *peer;
2684
2685         n=s->method->ssl_get_message(s,
2686                 SSL3_ST_SR_CERT_VRFY_A,
2687                 SSL3_ST_SR_CERT_VRFY_B,
2688                 -1,
2689                 514, /* 514? */
2690                 &ok);
2691
2692         if (!ok) return((int)n);
2693
2694         if (s->session->peer != NULL)
2695                 {
2696                 peer=s->session->peer;
2697                 pkey=X509_get_pubkey(peer);
2698                 type=X509_certificate_type(peer,pkey);
2699                 }
2700         else
2701                 {
2702                 peer=NULL;
2703                 pkey=NULL;
2704                 }
2705
2706         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2707                 {
2708                 s->s3->tmp.reuse_message=1;
2709                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2710                         {
2711                         al=SSL_AD_UNEXPECTED_MESSAGE;
2712                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2713                         goto f_err;
2714                         }
2715                 ret=1;
2716                 goto end;
2717                 }
2718
2719         if (peer == NULL)
2720                 {
2721                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2722                 al=SSL_AD_UNEXPECTED_MESSAGE;
2723                 goto f_err;
2724                 }
2725
2726         if (!(type & EVP_PKT_SIGN))
2727                 {
2728                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2729                 al=SSL_AD_ILLEGAL_PARAMETER;
2730                 goto f_err;
2731                 }
2732
2733         if (s->s3->change_cipher_spec)
2734                 {
2735                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2736                 al=SSL_AD_UNEXPECTED_MESSAGE;
2737                 goto f_err;
2738                 }
2739
2740         /* we now have a signature that we need to verify */
2741         p=(unsigned char *)s->init_msg;
2742         /* Check for broken implementations of GOST ciphersuites */
2743         /* If key is GOST and n is exactly 64, it is bare
2744          * signature without length field */
2745         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2746                 pkey->type == NID_id_GostR3410_2001) )
2747                 {
2748                 i=64;
2749                 }
2750         else
2751                 {
2752                 n2s(p,i);
2753                 n-=2;
2754                 if (i > n)
2755                         {
2756                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2757                         al=SSL_AD_DECODE_ERROR;
2758                         goto f_err;
2759                         }
2760         }
2761         j=EVP_PKEY_size(pkey);
2762         if ((i > j) || (n > j) || (n <= 0))
2763                 {
2764                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2765                 al=SSL_AD_DECODE_ERROR;
2766                 goto f_err;
2767                 }
2768
2769 #ifndef OPENSSL_NO_RSA
2770         if (pkey->type == EVP_PKEY_RSA)
2771                 {
2772                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2773                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2774                                                         pkey->pkey.rsa);
2775                 if (i < 0)
2776                         {
2777                         al=SSL_AD_DECRYPT_ERROR;
2778                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2779                         goto f_err;
2780                         }
2781                 if (i == 0)
2782                         {
2783                         al=SSL_AD_DECRYPT_ERROR;
2784                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2785                         goto f_err;
2786                         }
2787                 }
2788         else
2789 #endif
2790 #ifndef OPENSSL_NO_DSA
2791                 if (pkey->type == EVP_PKEY_DSA)
2792                 {
2793                 j=DSA_verify(pkey->save_type,
2794                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2795                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2796                 if (j <= 0)
2797                         {
2798                         /* bad signature */
2799                         al=SSL_AD_DECRYPT_ERROR;
2800                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2801                         goto f_err;
2802                         }
2803                 }
2804         else
2805 #endif
2806 #ifndef OPENSSL_NO_ECDSA
2807                 if (pkey->type == EVP_PKEY_EC)
2808                 {
2809                 j=ECDSA_verify(pkey->save_type,
2810                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2811                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2812                 if (j <= 0)
2813                         {
2814                         /* bad signature */
2815                         al=SSL_AD_DECRYPT_ERROR;
2816                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2817                             SSL_R_BAD_ECDSA_SIGNATURE);
2818                         goto f_err;
2819                         }
2820                 }
2821         else
2822 #endif
2823         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2824                 {   unsigned char signature[64];
2825                         int idx;
2826                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2827                         EVP_PKEY_verify_init(pctx);
2828                         if (i!=64) {
2829                                 fprintf(stderr,"GOST signature length is %d",i);
2830                         }
2831                         for (idx=0;idx<64;idx++) {
2832                                 signature[63-idx]=p[idx];
2833                         }
2834                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2835                         EVP_PKEY_CTX_free(pctx);
2836                         if (j<=0)
2837                                 {
2838                                 al=SSL_AD_DECRYPT_ERROR;
2839                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2840                                         SSL_R_BAD_ECDSA_SIGNATURE);
2841                                 goto f_err;
2842                                 }
2843                 }
2844         else
2845                 {
2846                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2847                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2848                 goto f_err;
2849                 }
2850
2851
2852         ret=1;
2853         if (0)
2854                 {
2855 f_err:
2856                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2857                 }
2858 end:
2859         EVP_PKEY_free(pkey);
2860         return(ret);
2861         }
2862
2863 int ssl3_get_client_certificate(SSL *s)
2864         {
2865         int i,ok,al,ret= -1;
2866         X509 *x=NULL;
2867         unsigned long l,nc,llen,n;
2868         const unsigned char *p,*q;
2869         unsigned char *d;
2870         STACK_OF(X509) *sk=NULL;
2871
2872         n=s->method->ssl_get_message(s,
2873                 SSL3_ST_SR_CERT_A,
2874                 SSL3_ST_SR_CERT_B,
2875                 -1,
2876                 s->max_cert_list,
2877                 &ok);
2878
2879         if (!ok) return((int)n);
2880
2881         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2882                 {
2883                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2884                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2885                         {
2886                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2887                         al=SSL_AD_HANDSHAKE_FAILURE;
2888                         goto f_err;
2889                         }
2890                 /* If tls asked for a client cert, the client must return a 0 list */
2891                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2892                         {
2893                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2894                         al=SSL_AD_UNEXPECTED_MESSAGE;
2895                         goto f_err;
2896                         }
2897                 s->s3->tmp.reuse_message=1;
2898                 return(1);
2899                 }
2900
2901         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2902                 {
2903                 al=SSL_AD_UNEXPECTED_MESSAGE;
2904                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2905                 goto f_err;
2906                 }
2907         p=d=(unsigned char *)s->init_msg;
2908
2909         if ((sk=sk_X509_new_null()) == NULL)
2910                 {
2911                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2912                 goto err;
2913                 }
2914
2915         n2l3(p,llen);
2916         if (llen+3 != n)
2917                 {
2918                 al=SSL_AD_DECODE_ERROR;
2919                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2920                 goto f_err;
2921                 }
2922         for (nc=0; nc<llen; )
2923                 {
2924                 n2l3(p,l);
2925                 if ((l+nc+3) > llen)
2926                         {
2927                         al=SSL_AD_DECODE_ERROR;
2928                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2929                         goto f_err;
2930                         }
2931
2932                 q=p;
2933                 x=d2i_X509(NULL,&p,l);
2934                 if (x == NULL)
2935                         {
2936                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2937                         goto err;
2938                         }
2939                 if (p != (q+l))
2940                         {
2941                         al=SSL_AD_DECODE_ERROR;
2942                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2943                         goto f_err;
2944                         }
2945                 if (!sk_X509_push(sk,x))
2946                         {
2947                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2948                         goto err;
2949                         }
2950                 x=NULL;
2951                 nc+=l+3;
2952                 }
2953
2954         if (sk_X509_num(sk) <= 0)
2955                 {
2956                 /* TLS does not mind 0 certs returned */
2957                 if (s->version == SSL3_VERSION)
2958                         {
2959                         al=SSL_AD_HANDSHAKE_FAILURE;
2960                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2961                         goto f_err;
2962                         }
2963                 /* Fail for TLS only if we required a certificate */
2964                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2965                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2966                         {
2967                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2968                         al=SSL_AD_HANDSHAKE_FAILURE;
2969                         goto f_err;
2970                         }
2971                 }
2972         else
2973                 {
2974                 i=ssl_verify_cert_chain(s,sk);
2975                 if (i <= 0)
2976                         {
2977                         al=ssl_verify_alarm_type(s->verify_result);
2978                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2979                         goto f_err;
2980                         }
2981                 }
2982
2983         if (s->session->peer != NULL) /* This should not be needed */
2984                 X509_free(s->session->peer);
2985         s->session->peer=sk_X509_shift(sk);
2986         s->session->verify_result = s->verify_result;
2987
2988         /* With the current implementation, sess_cert will always be NULL
2989          * when we arrive here. */
2990         if (s->session->sess_cert == NULL)
2991                 {
2992                 s->session->sess_cert = ssl_sess_cert_new();
2993                 if (s->session->sess_cert == NULL)
2994                         {
2995                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2996                         goto err;
2997                         }
2998                 }
2999         if (s->session->sess_cert->cert_chain != NULL)
3000                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3001         s->session->sess_cert->cert_chain=sk;
3002         /* Inconsistency alert: cert_chain does *not* include the
3003          * peer's own certificate, while we do include it in s3_clnt.c */
3004
3005         sk=NULL;
3006
3007         ret=1;
3008         if (0)
3009                 {
3010 f_err:
3011                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3012                 }
3013 err:
3014         if (x != NULL) X509_free(x);
3015         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3016         return(ret);
3017         }
3018
3019 int ssl3_send_server_certificate(SSL *s)
3020         {
3021         unsigned long l;
3022         X509 *x;
3023
3024         if (s->state == SSL3_ST_SW_CERT_A)
3025                 {
3026                 x=ssl_get_server_send_cert(s);
3027                 if (x == NULL)
3028                         {
3029                         /* VRS: allow null cert if auth == KRB5 */
3030                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3031                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3032                                 {
3033                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3034                                 return(0);
3035                                 }
3036                         }
3037
3038                 l=ssl3_output_cert_chain(s,x);
3039                 s->state=SSL3_ST_SW_CERT_B;
3040                 s->init_num=(int)l;
3041                 s->init_off=0;
3042                 }
3043
3044         /* SSL3_ST_SW_CERT_B */
3045         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3046         }
3047 #ifndef OPENSSL_NO_TLSEXT
3048 int ssl3_send_newsession_ticket(SSL *s)
3049         {
3050         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3051                 {
3052                 unsigned char *p, *senc, *macstart;
3053                 int len, slen;
3054                 unsigned int hlen;
3055                 EVP_CIPHER_CTX ctx;
3056                 HMAC_CTX hctx;
3057                 SSL_CTX *tctx = s->initial_ctx;
3058                 unsigned char iv[EVP_MAX_IV_LENGTH];
3059                 unsigned char key_name[16];
3060
3061                 /* get session encoding length */
3062                 slen = i2d_SSL_SESSION(s->session, NULL);
3063                 /* Some length values are 16 bits, so forget it if session is
3064                  * too long
3065                  */
3066                 if (slen > 0xFF00)
3067                         return -1;
3068                 /* Grow buffer if need be: the length calculation is as
3069                  * follows 1 (size of message name) + 3 (message length
3070                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3071                  * 16 (key name) + max_iv_len (iv length) +
3072                  * session_length + max_enc_block_size (max encrypted session
3073                  * length) + max_md_size (HMAC).
3074                  */
3075                 if (!BUF_MEM_grow(s->init_buf,
3076                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3077                         EVP_MAX_MD_SIZE + slen))
3078                         return -1;
3079                 senc = OPENSSL_malloc(slen);
3080                 if (!senc)
3081                         return -1;
3082                 p = senc;
3083                 i2d_SSL_SESSION(s->session, &p);
3084
3085                 p=(unsigned char *)s->init_buf->data;
3086                 /* do the header */
3087                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3088                 /* Skip message length for now */
3089                 p += 3;
3090                 EVP_CIPHER_CTX_init(&ctx);
3091                 HMAC_CTX_init(&hctx);
3092                 /* Initialize HMAC and cipher contexts. If callback present
3093                  * it does all the work otherwise use generated values
3094                  * from parent ctx.
3095                  */
3096                 if (tctx->tlsext_ticket_key_cb)
3097                         {
3098                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3099                                                          &hctx, 1) < 0)
3100                                 {
3101                                 OPENSSL_free(senc);
3102                                 return -1;
3103                                 }
3104                         }
3105                 else
3106                         {
3107                         RAND_pseudo_bytes(iv, 16);
3108                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3109                                         tctx->tlsext_tick_aes_key, iv);
3110                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3111                                         tlsext_tick_md(), NULL);
3112                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3113                         }
3114                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3115                 /* Skip ticket length for now */
3116                 p += 2;
3117                 /* Output key name */
3118                 macstart = p;
3119                 memcpy(p, key_name, 16);
3120                 p += 16;
3121                 /* output IV */
3122                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3123                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3124                 /* Encrypt session data */
3125                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3126                 p += len;
3127                 EVP_EncryptFinal(&ctx, p, &len);
3128                 p += len;
3129                 EVP_CIPHER_CTX_cleanup(&ctx);
3130
3131                 HMAC_Update(&hctx, macstart, p - macstart);
3132                 HMAC_Final(&hctx, p, &hlen);
3133                 HMAC_CTX_cleanup(&hctx);
3134
3135                 p += hlen;
3136                 /* Now write out lengths: p points to end of data written */
3137                 /* Total length */
3138                 len = p - (unsigned char *)s->init_buf->data;
3139                 p=(unsigned char *)s->init_buf->data + 1;
3140                 l2n3(len - 4, p); /* Message length */
3141                 p += 4;
3142                 s2n(len - 10, p);  /* Ticket length */
3143
3144                 /* number of bytes to write */
3145                 s->init_num= len;
3146                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3147                 s->init_off=0;
3148                 OPENSSL_free(senc);
3149                 }
3150
3151         /* SSL3_ST_SW_SESSION_TICKET_B */
3152         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3153         }
3154
3155 int ssl3_send_cert_status(SSL *s)
3156         {
3157         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3158                 {
3159                 unsigned char *p;
3160                 /* Grow buffer if need be: the length calculation is as
3161                  * follows 1 (message type) + 3 (message length) +
3162                  * 1 (ocsp response type) + 3 (ocsp response length)
3163                  * + (ocsp response)
3164                  */
3165                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3166                         return -1;
3167
3168                 p=(unsigned char *)s->init_buf->data;
3169
3170                 /* do the header */
3171                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3172                 /* message length */
3173                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3174                 /* status type */
3175                 *(p++)= s->tlsext_status_type;
3176                 /* length of OCSP response */
3177                 l2n3(s->tlsext_ocsp_resplen, p);
3178                 /* actual response */
3179                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3180                 /* number of bytes to write */
3181                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3182                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3183                 s->init_off = 0;
3184                 }
3185
3186         /* SSL3_ST_SW_CERT_STATUS_B */
3187         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3188         }
3189 #endif