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 #ifndef OPENSSL_NO_SRP
 183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 184         {
 185         int ret = SSL_ERROR_NONE;
 186
 187         *al = SSL_AD_UNRECOGNIZED_NAME;
 188
 189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 191                 {
 192                 if(s->srp_ctx.login == NULL)
 193                         {
 194                         /* RFC 5054 says SHOULD reject,
 195                            we do so if There is no srp login name */
 196                         ret = SSL3_AL_FATAL;
 197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 198                         }
 199                 else
 200                         {
 201                         ret = SSL_srp_server_param_with_username(s,al);
 202                         }
 203                 }
 204         return ret;
 205         }
 206 #endif
 207
 208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 209                         ssl3_accept,
 210                         ssl_undefined_function,
 211                         ssl3_get_server_method)
 212
 213 int ssl3_accept(SSL *s)
 214         {
 215         BUF_MEM *buf;
 216         unsigned long alg_k,Time=(unsigned long)time(NULL);
 217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 218         int ret= -1;
 219         int new_state,state,skip=0;
 220
 221         RAND_add(&Time,sizeof(Time),0);
 222         ERR_clear_error();
 223         clear_sys_error();
 224
 225         if (s->info_callback != NULL)
 226                 cb=s->info_callback;
 227         else if (s->ctx->info_callback != NULL)
 228                 cb=s->ctx->info_callback;
 229
 230         /* init things to blank */
 231         s->in_handshake++;
 232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 233
 234         if (s->cert == NULL)
 235                 {
 236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 237                 return(-1);
 238                 }
 239
 240 #ifndef OPENSSL_NO_HEARTBEATS
 241         /* If we're awaiting a HeartbeatResponse, pretend we
 242          * already got and don't await it anymore, because
 243          * Heartbeats don't make sense during handshakes anyway.
 244          */
 245         if (s->tlsext_hb_pending)
 246                 {
 247                 s->tlsext_hb_pending = 0;
 248                 s->tlsext_hb_seq++;
 249                 }
 250 #endif
 251
 252         for (;;)
 253                 {
 254                 state=s->state;
 255
 256                 switch (s->state)
 257                         {
 258                 case SSL_ST_RENEGOTIATE:
 259                         s->renegotiate=1;
 260                         /* s->state=SSL_ST_ACCEPT; */
 261
 262                 case SSL_ST_BEFORE:
 263                 case SSL_ST_ACCEPT:
 264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 265                 case SSL_ST_OK|SSL_ST_ACCEPT:
 266
 267                         s->server=1;
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 269
 270                         if ((s->version>>8) != 3)
 271                                 {
 272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 273                                 return -1;
 274                                 }
 275                         s->type=SSL_ST_ACCEPT;
 276
 277                         if (s->init_buf == NULL)
 278                                 {
 279                                 if ((buf=BUF_MEM_new()) == NULL)
 280                                         {
 281                                         ret= -1;
 282                                         goto end;
 283                                         }
 284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 285                                         {
 286                                         ret= -1;
 287                                         goto end;
 288                                         }
 289                                 s->init_buf=buf;
 290                                 }
 291
 292                         if (!ssl3_setup_buffers(s))
 293                                 {
 294                                 ret= -1;
 295                                 goto end;
 296                                 }
 297
 298                         s->init_num=0;
 299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 300                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 301
 302                         if (s->state != SSL_ST_RENEGOTIATE)
 303                                 {
 304                                 /* Ok, we now need to push on a buffering BIO so that
 305                                  * the output is sent in a way that TCP likes :-)
 306                                  */
 307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 308
 309                                 ssl3_init_finished_mac(s);
 310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 311                                 s->ctx->stats.sess_accept++;
 312                                 }
 313                         else if (!s->s3->send_connection_binding &&
 314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 315                                 {
 316                                 /* Server attempting to renegotiate with
 317                                  * client that doesn't support secure
 318                                  * renegotiation.
 319                                  */
 320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 322                                 ret = -1;
 323                                 goto end;
 324                                 }
 325                         else
 326                                 {
 327                                 /* s->state == SSL_ST_RENEGOTIATE,
 328                                  * we will just send a HelloRequest */
 329                                 s->ctx->stats.sess_accept_renegotiate++;
 330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 331                                 }
 332                         break;
 333
 334                 case SSL3_ST_SW_HELLO_REQ_A:
 335                 case SSL3_ST_SW_HELLO_REQ_B:
 336
 337                         s->shutdown=0;
 338                         ret=ssl3_send_hello_request(s);
 339                         if (ret <= 0) goto end;
 340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 341                         s->state=SSL3_ST_SW_FLUSH;
 342                         s->init_num=0;
 343
 344                         ssl3_init_finished_mac(s);
 345                         break;
 346
 347                 case SSL3_ST_SW_HELLO_REQ_C:
 348                         s->state=SSL_ST_OK;
 349                         break;
 350
 351                 case SSL3_ST_SR_CLNT_HELLO_A:
 352                 case SSL3_ST_SR_CLNT_HELLO_B:
 353                 case SSL3_ST_SR_CLNT_HELLO_C:
 354
 355                         if (s->rwstate != SSL_X509_LOOKUP)
 356                         {
 357                                 ret=ssl3_get_client_hello(s);
 358                                 if (ret <= 0) goto end;
 359                         }
 360 #ifndef OPENSSL_NO_SRP
 361                         {
 362                         int al;
 363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 364                                         {
 365                                         /* callback indicates firther work to be done */
 366                                         s->rwstate=SSL_X509_LOOKUP;
 367                                         goto end;
 368                                         }
 369                         if (ret != SSL_ERROR_NONE)
 370                                 {
 371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 372                                 /* This is not really an error but the only means to
 373                                    for a client to detect whether srp is supported. */
 374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 377                                 ret= -1;
 378                                 goto end;
 379                                 }
 380                         }
 381 #endif
 382
 383                         s->renegotiate = 2;
 384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 385                         s->init_num=0;
 386                         break;
 387
 388                 case SSL3_ST_SW_SRVR_HELLO_A:
 389                 case SSL3_ST_SW_SRVR_HELLO_B:
 390                         ret=ssl3_send_server_hello(s);
 391                         if (ret <= 0) goto end;
 392 #ifndef OPENSSL_NO_TLSEXT
 393                         if (s->hit)
 394                                 {
 395                                 if (s->tlsext_ticket_expected)
 396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 397                                 else
 398                                         s->state=SSL3_ST_SW_CHANGE_A;
 399                                 }
 400 #else
 401                         if (s->hit)
 402                                         s->state=SSL3_ST_SW_CHANGE_A;
 403 #endif
 404                         else
 405 #ifndef OPENSSL_NO_TLSEXT
 406                                 s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_A;
 407 #else
 408                         s->state = SSL3_ST_SW_CERT_A;
 409 #endif
 410                         s->init_num = 0;
 411                         break;
 412
 413 #ifndef OPENSSL_NO_TLSEXT
 414                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_A:
 415                 case SSL3_ST_SW_SUPPLEMENTAL_DATA_B:
 416                         /* We promised to send an audit proof in the hello. */
 417                         if (s->s3->tlsext_authz_promised_to_client)
 418                                 {
 419                                 ret = tls1_send_server_supplemental_data(s);
 420                                 if (ret <= 0) goto end;
 421                                 }
 422                         else
 423                                 skip = 1;
 424
 425                         s->state = SSL3_ST_SW_CERT_A;
 426                         s->init_num = 0;
 427                         break;
 428 #endif
 429
 430                 case SSL3_ST_SW_CERT_A:
 431                 case SSL3_ST_SW_CERT_B:
 432                         /* Check if it is anon DH or anon ECDH, */
 433                         /* normal PSK or KRB5 or SRP */
 434                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 435                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 436                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 437                                 {
 438                                 ret=ssl3_send_server_certificate(s);
 439                                 if (ret <= 0) goto end;
 440 #ifndef OPENSSL_NO_TLSEXT
 441                                 if (s->tlsext_status_expected)
 442                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 443                                 else
 444                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 445                                 }
 446                         else
 447                                 {
 448                                 skip = 1;
 449                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 450                                 }
 451 #else
 452                                 }
 453                         else
 454                                 skip=1;
 455
 456                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 457 #endif
 458                         s->init_num=0;
 459                         break;
 460
 461                 case SSL3_ST_SW_KEY_EXCH_A:
 462                 case SSL3_ST_SW_KEY_EXCH_B:
 463                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 464
 465                         /* clear this, it may get reset by
 466                          * send_server_key_exchange */
 467                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 468 #ifndef OPENSSL_NO_KRB5
 469                                 && !(alg_k & SSL_kKRB5)
 470 #endif /* OPENSSL_NO_KRB5 */
 471                                 )
 472                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 473                                  * even when forbidden by protocol specs
 474                                  * (handshake may fail as clients are not required to
 475                                  * be able to handle this) */
 476                                 s->s3->tmp.use_rsa_tmp=1;
 477                         else
 478                                 s->s3->tmp.use_rsa_tmp=0;
 479
 480
 481                         /* only send if a DH key exchange, fortezza or
 482                          * RSA but we have a sign only certificate
 483                          *
 484                          * PSK: may send PSK identity hints
 485                          *
 486                          * For ECC ciphersuites, we send a serverKeyExchange
 487                          * message only if the cipher suite is either
 488                          * ECDH-anon or ECDHE. In other cases, the
 489                          * server certificate contains the server's
 490                          * public key for key exchange.
 491                          */
 492                         if (s->s3->tmp.use_rsa_tmp
 493                         /* PSK: send ServerKeyExchange if PSK identity
 494                          * hint if provided */
 495 #ifndef OPENSSL_NO_PSK
 496                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 497 #endif
 498 #ifndef OPENSSL_NO_SRP
 499                             /* SRP: send ServerKeyExchange */
 500                             || (alg_k & SSL_kSRP)
 501 #endif
 502                             || (alg_k & SSL_kEDH)
 503                             || (alg_k & SSL_kEECDH)
 504                             || ((alg_k & SSL_kRSA)
 505                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 506                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 507                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 508                                         )
 509                                     )
 510                                 )
 511                             )
 512                                 {
 513                                 ret=ssl3_send_server_key_exchange(s);
 514                                 if (ret <= 0) goto end;
 515                                 }
 516                         else
 517                                 skip=1;
 518
 519                         s->state=SSL3_ST_SW_CERT_REQ_A;
 520                         s->init_num=0;
 521                         break;
 522
 523                 case SSL3_ST_SW_CERT_REQ_A:
 524                 case SSL3_ST_SW_CERT_REQ_B:
 525                         if (/* don't request cert unless asked for it: */
 526                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 527                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 528                                  * don't request cert during re-negotiation: */
 529                                 ((s->session->peer != NULL) &&
 530                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 531                                 /* never request cert in anonymous ciphersuites
 532                                  * (see section "Certificate request" in SSL 3 drafts
 533                                  * and in RFC 2246): */
 534                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 535                                  /* ... except when the application insists on verification
 536                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 537                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 538                                  /* never request cert in Kerberos ciphersuites */
 539                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 540                                 /* With normal PSK Certificates and
 541                                  * Certificate Requests are omitted */
 542                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 543                                 {
 544                                 /* no cert request */
 545                                 skip=1;
 546                                 s->s3->tmp.cert_request=0;
 547                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 548                                 if (s->s3->handshake_buffer)
 549                                         if (!ssl3_digest_cached_records(s))
 550                                                 return -1;
 551                                 }
 552                         else
 553                                 {
 554                                 s->s3->tmp.cert_request=1;
 555                                 ret=ssl3_send_certificate_request(s);
 556                                 if (ret <= 0) goto end;
 557 #ifndef NETSCAPE_HANG_BUG
 558                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 559 #else
 560                                 s->state=SSL3_ST_SW_FLUSH;
 561                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 562 #endif
 563                                 s->init_num=0;
 564                                 }
 565                         break;
 566
 567                 case SSL3_ST_SW_SRVR_DONE_A:
 568                 case SSL3_ST_SW_SRVR_DONE_B:
 569                         ret=ssl3_send_server_done(s);
 570                         if (ret <= 0) goto end;
 571                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 572                         s->state=SSL3_ST_SW_FLUSH;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_SW_FLUSH:
 577
 578                         /* This code originally checked to see if
 579                          * any data was pending using BIO_CTRL_INFO
 580                          * and then flushed. This caused problems
 581                          * as documented in PR#1939. The proposed
 582                          * fix doesn't completely resolve this issue
 583                          * as buggy implementations of BIO_CTRL_PENDING
 584                          * still exist. So instead we just flush
 585                          * unconditionally.
 586                          */
 587
 588                         s->rwstate=SSL_WRITING;
 589                         if (BIO_flush(s->wbio) <= 0)
 590                                 {
 591                                 ret= -1;
 592                                 goto end;
 593                                 }
 594                         s->rwstate=SSL_NOTHING;
 595
 596                         s->state=s->s3->tmp.next_state;
 597                         break;
 598
 599                 case SSL3_ST_SR_CERT_A:
 600                 case SSL3_ST_SR_CERT_B:
 601                         /* Check for second client hello (MS SGC) */
 602                         ret = ssl3_check_client_hello(s);
 603                         if (ret <= 0)
 604                                 goto end;
 605                         if (ret == 2)
 606                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 607                         else {
 608                                 if (s->s3->tmp.cert_request)
 609                                         {
 610                                         ret=ssl3_get_client_certificate(s);
 611                                         if (ret <= 0) goto end;
 612                                         }
 613                                 s->init_num=0;
 614                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 615                         }
 616                         break;
 617
 618                 case SSL3_ST_SR_KEY_EXCH_A:
 619                 case SSL3_ST_SR_KEY_EXCH_B:
 620                         ret=ssl3_get_client_key_exchange(s);
 621                         if (ret <= 0)
 622                                 goto end;
 623                         if (ret == 2)
 624                                 {
 625                                 /* For the ECDH ciphersuites when
 626                                  * the client sends its ECDH pub key in
 627                                  * a certificate, the CertificateVerify
 628                                  * message is not sent.
 629                                  * Also for GOST ciphersuites when
 630                                  * the client uses its key from the certificate
 631                                  * for key exchange.
 632                                  */
 633 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 634                                 s->state=SSL3_ST_SR_FINISHED_A;
 635 #else
 636                                 if (s->s3->next_proto_neg_seen)
 637                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 638                                 else
 639                                         s->state=SSL3_ST_SR_FINISHED_A;
 640 #endif
 641                                 s->init_num = 0;
 642                                 }
 643                         else if (SSL_USE_SIGALGS(s))
 644                                 {
 645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 646                                 s->init_num=0;
 647                                 if (!s->session->peer)
 648                                         break;
 649                                 /* For sigalgs freeze the handshake buffer
 650                                  * at this point and digest cached records.
 651                                  */
 652                                 if (!s->s3->handshake_buffer)
 653                                         {
 654                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 655                                         return -1;
 656                                         }
 657                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 658                                 if (!ssl3_digest_cached_records(s))
 659                                         return -1;
 660                                 }
 661                         else
 662                                 {
 663                                 int offset=0;
 664                                 int dgst_num;
 665
 666                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 667                                 s->init_num=0;
 668
 669                                 /* We need to get hashes here so if there is
 670                                  * a client cert, it can be verified
 671                                  * FIXME - digest processing for CertificateVerify
 672                                  * should be generalized. But it is next step
 673                                  */
 674                                 if (s->s3->handshake_buffer)
 675                                         if (!ssl3_digest_cached_records(s))
 676                                                 return -1;
 677                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 678                                         if (s->s3->handshake_dgst[dgst_num])
 679                                                 {
 680                                                 int dgst_size;
 681
 682                                                 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]));
 683                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 684                                                 if (dgst_size < 0)
 685                                                         {
 686                                                         ret = -1;
 687                                                         goto end;
 688                                                         }
 689                                                 offset+=dgst_size;
 690                                                 }
 691                                 }
 692                         break;
 693
 694                 case SSL3_ST_SR_CERT_VRFY_A:
 695                 case SSL3_ST_SR_CERT_VRFY_B:
 696
 697                         /* we should decide if we expected this one */
 698                         ret=ssl3_get_cert_verify(s);
 699                         if (ret <= 0) goto end;
 700
 701 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 702                         s->state=SSL3_ST_SR_FINISHED_A;
 703 #else
 704                         if (s->s3->next_proto_neg_seen)
 705                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 706                         else
 707                                 s->state=SSL3_ST_SR_FINISHED_A;
 708 #endif
 709                         s->init_num=0;
 710                         break;
 711
 712 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 713                 case SSL3_ST_SR_NEXT_PROTO_A:
 714                 case SSL3_ST_SR_NEXT_PROTO_B:
 715                         ret=ssl3_get_next_proto(s);
 716                         if (ret <= 0) goto end;
 717                         s->init_num = 0;
 718                         s->state=SSL3_ST_SR_FINISHED_A;
 719                         break;
 720 #endif
 721
 722                 case SSL3_ST_SR_FINISHED_A:
 723                 case SSL3_ST_SR_FINISHED_B:
 724                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 725                                 SSL3_ST_SR_FINISHED_B);
 726                         if (ret <= 0) goto end;
 727                         if (s->hit)
 728                                 s->state=SSL_ST_OK;
 729 #ifndef OPENSSL_NO_TLSEXT
 730                         else if (s->tlsext_ticket_expected)
 731                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 732 #endif
 733                         else
 734                                 s->state=SSL3_ST_SW_CHANGE_A;
 735                         s->init_num=0;
 736                         break;
 737
 738 #ifndef OPENSSL_NO_TLSEXT
 739                 case SSL3_ST_SW_SESSION_TICKET_A:
 740                 case SSL3_ST_SW_SESSION_TICKET_B:
 741                         ret=ssl3_send_newsession_ticket(s);
 742                         if (ret <= 0) goto end;
 743                         s->state=SSL3_ST_SW_CHANGE_A;
 744                         s->init_num=0;
 745                         break;
 746
 747                 case SSL3_ST_SW_CERT_STATUS_A:
 748                 case SSL3_ST_SW_CERT_STATUS_B:
 749                         ret=ssl3_send_cert_status(s);
 750                         if (ret <= 0) goto end;
 751                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 752                         s->init_num=0;
 753                         break;
 754
 755 #endif
 756
 757                 case SSL3_ST_SW_CHANGE_A:
 758                 case SSL3_ST_SW_CHANGE_B:
 759
 760                         s->session->cipher=s->s3->tmp.new_cipher;
 761                         if (!s->method->ssl3_enc->setup_key_block(s))
 762                                 { ret= -1; goto end; }
 763
 764                         ret=ssl3_send_change_cipher_spec(s,
 765                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 766
 767                         if (ret <= 0) goto end;
 768                         s->state=SSL3_ST_SW_FINISHED_A;
 769                         s->init_num=0;
 770
 771                         if (!s->method->ssl3_enc->change_cipher_state(s,
 772                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 773                                 {
 774                                 ret= -1;
 775                                 goto end;
 776                                 }
 777
 778                         break;
 779
 780                 case SSL3_ST_SW_FINISHED_A:
 781                 case SSL3_ST_SW_FINISHED_B:
 782                         ret=ssl3_send_finished(s,
 783                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 784                                 s->method->ssl3_enc->server_finished_label,
 785                                 s->method->ssl3_enc->server_finished_label_len);
 786                         if (ret <= 0) goto end;
 787                         s->state=SSL3_ST_SW_FLUSH;
 788                         if (s->hit)
 789                                 {
 790 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 791                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 792 #else
 793                                 if (s->s3->next_proto_neg_seen)
 794                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 795                                 else
 796                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 797 #endif
 798                                 }
 799                         else
 800                                 s->s3->tmp.next_state=SSL_ST_OK;
 801                         s->init_num=0;
 802                         break;
 803
 804                 case SSL_ST_OK:
 805                         /* clean a few things up */
 806                         ssl3_cleanup_key_block(s);
 807
 808                         BUF_MEM_free(s->init_buf);
 809                         s->init_buf=NULL;
 810
 811                         /* remove buffering on output */
 812                         ssl_free_wbio_buffer(s);
 813
 814                         s->init_num=0;
 815
 816                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 817                                 {
 818                                 s->renegotiate=0;
 819                                 s->new_session=0;
 820
 821                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 822
 823                                 s->ctx->stats.sess_accept_good++;
 824                                 /* s->server=1; */
 825                                 s->handshake_func=ssl3_accept;
 826
 827                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 828                                 }
 829
 830                         ret = 1;
 831                         goto end;
 832                         /* break; */
 833
 834                 default:
 835                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 836                         ret= -1;
 837                         goto end;
 838                         /* break; */
 839                         }
 840
 841                 if (!s->s3->tmp.reuse_message && !skip)
 842                         {
 843                         if (s->debug)
 844                                 {
 845                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 846                                         goto end;
 847                                 }
 848
 849
 850                         if ((cb != NULL) && (s->state != state))
 851                                 {
 852                                 new_state=s->state;
 853                                 s->state=state;
 854                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 855                                 s->state=new_state;
 856                                 }
 857                         }
 858                 skip=0;
 859                 }
 860 end:
 861         /* BIO_flush(s->wbio); */
 862
 863         s->in_handshake--;
 864         if (cb != NULL)
 865                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 866         return(ret);
 867         }
 868
 869 int ssl3_send_hello_request(SSL *s)
 870         {
 871
 872         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 873                 {
 874                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 875                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 876                 }
 877
 878         /* SSL3_ST_SW_HELLO_REQ_B */
 879         return ssl_do_write(s);
 880         }
 881
 882 int ssl3_check_client_hello(SSL *s)
 883         {
 884         int ok;
 885         long n;
 886
 887         /* this function is called when we really expect a Certificate message,
 888          * so permit appropriate message length */
 889         n=s->method->ssl_get_message(s,
 890                 SSL3_ST_SR_CERT_A,
 891                 SSL3_ST_SR_CERT_B,
 892                 -1,
 893                 s->max_cert_list,
 894                 &ok);
 895         if (!ok) return((int)n);
 896         s->s3->tmp.reuse_message = 1;
 897         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 898                 {
 899                 /* We only allow the client to restart the handshake once per
 900                  * negotiation. */
 901                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 902                         {
 903                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 904                         return -1;
 905                         }
 906                 /* Throw away what we have done so far in the current handshake,
 907                  * which will now be aborted. (A full SSL_clear would be too much.) */
 908 #ifndef OPENSSL_NO_DH
 909                 if (s->s3->tmp.dh != NULL)
 910                         {
 911                         DH_free(s->s3->tmp.dh);
 912                         s->s3->tmp.dh = NULL;
 913                         }
 914 #endif
 915 #ifndef OPENSSL_NO_ECDH
 916                 if (s->s3->tmp.ecdh != NULL)
 917                         {
 918                         EC_KEY_free(s->s3->tmp.ecdh);
 919                         s->s3->tmp.ecdh = NULL;
 920                         }
 921 #endif
 922                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 923                 return 2;
 924                 }
 925         return 1;
 926 }
 927
 928 int ssl3_get_client_hello(SSL *s)
 929         {
 930         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 931         unsigned int cookie_len;
 932         long n;
 933         unsigned long id;
 934         unsigned char *p,*d;
 935         SSL_CIPHER *c;
 936 #ifndef OPENSSL_NO_COMP
 937         unsigned char *q;
 938         SSL_COMP *comp=NULL;
 939 #endif
 940         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 941
 942         /* We do this so that we will respond with our native type.
 943          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 944          * This down switching should be handled by a different method.
 945          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 946          * TLSv1.
 947          */
 948         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 949                 )
 950                 {
 951                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 952                 }
 953         s->first_packet=1;
 954         n=s->method->ssl_get_message(s,
 955                 SSL3_ST_SR_CLNT_HELLO_B,
 956                 SSL3_ST_SR_CLNT_HELLO_C,
 957                 SSL3_MT_CLIENT_HELLO,
 958                 SSL3_RT_MAX_PLAIN_LENGTH,
 959                 &ok);
 960
 961         if (!ok) return((int)n);
 962         s->first_packet=0;
 963         d=p=(unsigned char *)s->init_msg;
 964
 965         /* use version from inside client hello, not from record header
 966          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 967         s->client_version=(((int)p[0])<<8)|(int)p[1];
 968         p+=2;
 969
 970         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 971             (s->version != DTLS1_VERSION && s->client_version < s->version))
 972                 {
 973                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 974                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 975                         {
 976                         /* similar to ssl3_get_record, send alert using remote version number */
 977                         s->version = s->client_version;
 978                         }
 979                 al = SSL_AD_PROTOCOL_VERSION;
 980                 goto f_err;
 981                 }
 982
 983         /* If we require cookies and this ClientHello doesn't
 984          * contain one, just return since we do not want to
 985          * allocate any memory yet. So check cookie length...
 986          */
 987         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 988                 {
 989                 unsigned int session_length, cookie_length;
 990
 991                 session_length = *(p + SSL3_RANDOM_SIZE);
 992                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 993
 994                 if (cookie_length == 0)
 995                         return 1;
 996                 }
 997
 998         /* load the client random */
 999         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1000         p+=SSL3_RANDOM_SIZE;
1001
1002         /* get the session-id */
1003         j= *(p++);
1004
1005         s->hit=0;
1006         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1007          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1008          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1009          * than a change to default behavior so that applications relying on this for security
1010          * won't even compile against older library versions).
1011          *
1012          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1013          * renegotiation but not a new session (s->new_session remains unset): for servers,
1014          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1015          * setting will be ignored.
1016          */
1017         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1018                 {
1019                 if (!ssl_get_new_session(s,1))
1020                         goto err;
1021                 }
1022         else
1023                 {
1024                 i=ssl_get_prev_session(s, p, j, d + n);
1025                 if (i == 1)
1026                         { /* previous session */
1027                         s->hit=1;
1028                         }
1029                 else if (i == -1)
1030                         goto err;
1031                 else /* i == 0 */
1032                         {
1033                         if (!ssl_get_new_session(s,1))
1034                                 goto err;
1035                         }
1036                 }
1037
1038         p+=j;
1039
1040         if (SSL_IS_DTLS(s))
1041                 {
1042                 /* cookie stuff */
1043                 cookie_len = *(p++);
1044
1045                 /*
1046                  * The ClientHello may contain a cookie even if the
1047                  * HelloVerify message has not been sent--make sure that it
1048                  * does not cause an overflow.
1049                  */
1050                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1051                         {
1052                         /* too much data */
1053                         al = SSL_AD_DECODE_ERROR;
1054                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1055                         goto f_err;
1056                         }
1057
1058                 /* verify the cookie if appropriate option is set. */
1059                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1060                         cookie_len > 0)
1061                         {
1062                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1063
1064                         if ( s->ctx->app_verify_cookie_cb != NULL)
1065                                 {
1066                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1067                                         cookie_len) == 0)
1068                                         {
1069                                         al=SSL_AD_HANDSHAKE_FAILURE;
1070                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1071                                                 SSL_R_COOKIE_MISMATCH);
1072                                         goto f_err;
1073                                         }
1074                                 /* else cookie verification succeeded */
1075                                 }
1076                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1077                                                   s->d1->cookie_len) != 0) /* default verification */
1078                                 {
1079                                         al=SSL_AD_HANDSHAKE_FAILURE;
1080                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1081                                                 SSL_R_COOKIE_MISMATCH);
1082                                         goto f_err;
1083                                 }
1084
1085                         ret = 2;
1086                         }
1087
1088                 p += cookie_len;
1089                 }
1090
1091         n2s(p,i);
1092         if ((i == 0) && (j != 0))
1093                 {
1094                 /* we need a cipher if we are not resuming a session */
1095                 al=SSL_AD_ILLEGAL_PARAMETER;
1096                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1097                 goto f_err;
1098                 }
1099         if ((p+i) >= (d+n))
1100                 {
1101                 /* not enough data */
1102                 al=SSL_AD_DECODE_ERROR;
1103                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1104                 goto f_err;
1105                 }
1106         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1107                 == NULL))
1108                 {
1109                 goto err;
1110                 }
1111         p+=i;
1112
1113         /* If it is a hit, check that the cipher is in the list */
1114         if ((s->hit) && (i > 0))
1115                 {
1116                 j=0;
1117                 id=s->session->cipher->id;
1118
1119 #ifdef CIPHER_DEBUG
1120                 printf("client sent %d ciphers\n",sk_num(ciphers));
1121 #endif
1122                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1123                         {
1124                         c=sk_SSL_CIPHER_value(ciphers,i);
1125 #ifdef CIPHER_DEBUG
1126                         printf("client [%2d of %2d]:%s\n",
1127                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1128 #endif
1129                         if (c->id == id)
1130                                 {
1131                                 j=1;
1132                                 break;
1133                                 }
1134                         }
1135 /* Disabled because it can be used in a ciphersuite downgrade
1136  * attack: CVE-2010-4180.
1137  */
1138 #if 0
1139                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1140                         {
1141                         /* Special case as client bug workaround: the previously used cipher may
1142                          * not be in the current list, the client instead might be trying to
1143                          * continue using a cipher that before wasn't chosen due to server
1144                          * preferences.  We'll have to reject the connection if the cipher is not
1145                          * enabled, though. */
1146                         c = sk_SSL_CIPHER_value(ciphers, 0);
1147                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1148                                 {
1149                                 s->session->cipher = c;
1150                                 j = 1;
1151                                 }
1152                         }
1153 #endif
1154                 if (j == 0)
1155                         {
1156                         /* we need to have the cipher in the cipher
1157                          * list if we are asked to reuse it */
1158                         al=SSL_AD_ILLEGAL_PARAMETER;
1159                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1160                         goto f_err;
1161                         }
1162                 }
1163
1164         /* compression */
1165         i= *(p++);
1166         if ((p+i) > (d+n))
1167                 {
1168                 /* not enough data */
1169                 al=SSL_AD_DECODE_ERROR;
1170                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1171                 goto f_err;
1172                 }
1173 #ifndef OPENSSL_NO_COMP
1174         q=p;
1175 #endif
1176         for (j=0; j<i; j++)
1177                 {
1178                 if (p[j] == 0) break;
1179                 }
1180
1181         p+=i;
1182         if (j >= i)
1183                 {
1184                 /* no compress */
1185                 al=SSL_AD_DECODE_ERROR;
1186                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1187                 goto f_err;
1188                 }
1189
1190 #ifndef OPENSSL_NO_TLSEXT
1191         /* TLS extensions*/
1192         if (s->version >= SSL3_VERSION)
1193                 {
1194                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1195                         {
1196                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1197                         goto err;
1198                         }
1199                 }
1200
1201         /* Check if we want to use external pre-shared secret for this
1202          * handshake for not reused session only. We need to generate
1203          * server_random before calling tls_session_secret_cb in order to allow
1204          * SessionTicket processing to use it in key derivation. */
1205         {
1206                 unsigned long Time;
1207                 unsigned char *pos;
1208                 Time=(unsigned long)time(NULL);                 /* Time */
1209                 pos=s->s3->server_random;
1210                 l2n(Time,pos);
1211                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1212                         {
1213                         goto f_err;
1214                         }
1215         }
1216
1217         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1218                 {
1219                 SSL_CIPHER *pref_cipher=NULL;
1220
1221                 s->session->master_key_length=sizeof(s->session->master_key);
1222                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1223                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1224                         {
1225                         s->hit=1;
1226                         s->session->ciphers=ciphers;
1227                         s->session->verify_result=X509_V_OK;
1228
1229                         ciphers=NULL;
1230
1231                         /* check if some cipher was preferred by call back */
1232                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1233                         if (pref_cipher == NULL)
1234                                 {
1235                                 al=SSL_AD_HANDSHAKE_FAILURE;
1236                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1237                                 goto f_err;
1238                                 }
1239
1240                         s->session->cipher=pref_cipher;
1241
1242                         if (s->cipher_list)
1243                                 sk_SSL_CIPHER_free(s->cipher_list);
1244
1245                         if (s->cipher_list_by_id)
1246                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1247
1248                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1249                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1250                         }
1251                 }
1252 #endif
1253
1254         /* Worst case, we will use the NULL compression, but if we have other
1255          * options, we will now look for them.  We have i-1 compression
1256          * algorithms from the client, starting at q. */
1257         s->s3->tmp.new_compression=NULL;
1258 #ifndef OPENSSL_NO_COMP
1259         /* This only happens if we have a cache hit */
1260         if (s->session->compress_meth != 0)
1261                 {
1262                 int m, comp_id = s->session->compress_meth;
1263                 /* Perform sanity checks on resumed compression algorithm */
1264                 /* Can't disable compression */
1265                 if (s->options & SSL_OP_NO_COMPRESSION)
1266                         {
1267                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1268                         goto f_err;
1269                         }
1270                 /* Look for resumed compression method */
1271                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1272                         {
1273                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1274                         if (comp_id == comp->id)
1275                                 {
1276                                 s->s3->tmp.new_compression=comp;
1277                                 break;
1278                                 }
1279                         }
1280                 if (s->s3->tmp.new_compression == NULL)
1281                         {
1282                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1283                         goto f_err;
1284                         }
1285                 /* Look for resumed method in compression list */
1286                 for (m = 0; m < i; m++)
1287                         {
1288                         if (q[m] == comp_id)
1289                                 break;
1290                         }
1291                 if (m >= i)
1292                         {
1293                         al=SSL_AD_ILLEGAL_PARAMETER;
1294                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1295                         goto f_err;
1296                         }
1297                 }
1298         else if (s->hit)
1299                 comp = NULL;
1300         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1301                 { /* See if we have a match */
1302                 int m,nn,o,v,done=0;
1303
1304                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1305                 for (m=0; m<nn; m++)
1306                         {
1307                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1308                         v=comp->id;
1309                         for (o=0; o<i; o++)
1310                                 {
1311                                 if (v == q[o])
1312                                         {
1313                                         done=1;
1314                                         break;
1315                                         }
1316                                 }
1317                         if (done) break;
1318                         }
1319                 if (done)
1320                         s->s3->tmp.new_compression=comp;
1321                 else
1322                         comp=NULL;
1323                 }
1324 #else
1325         /* If compression is disabled we'd better not try to resume a session
1326          * using compression.
1327          */
1328         if (s->session->compress_meth != 0)
1329                 {
1330                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1331                 goto f_err;
1332                 }
1333 #endif
1334
1335         /* Given s->session->ciphers and SSL_get_ciphers, we must
1336          * pick a cipher */
1337
1338         if (!s->hit)
1339                 {
1340 #ifdef OPENSSL_NO_COMP
1341                 s->session->compress_meth=0;
1342 #else
1343                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1344 #endif
1345                 if (s->session->ciphers != NULL)
1346                         sk_SSL_CIPHER_free(s->session->ciphers);
1347                 s->session->ciphers=ciphers;
1348                 if (ciphers == NULL)
1349                         {
1350                         al=SSL_AD_ILLEGAL_PARAMETER;
1351                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1352                         goto f_err;
1353                         }
1354                 ciphers=NULL;
1355                 /* Let cert callback update server certificates if required */
1356                 if (s->cert->cert_cb
1357                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1358                         {
1359                         al=SSL_AD_INTERNAL_ERROR;
1360                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1361                         goto f_err;
1362                         }
1363                 c=ssl3_choose_cipher(s,s->session->ciphers,
1364                                      SSL_get_ciphers(s));
1365
1366                 if (c == NULL)
1367                         {
1368                         al=SSL_AD_HANDSHAKE_FAILURE;
1369                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1370                         goto f_err;
1371                         }
1372                 s->s3->tmp.new_cipher=c;
1373                 /* check whether we should disable session resumption */
1374                 if (s->not_resumable_session_cb != NULL)
1375                         s->session->not_resumable=s->not_resumable_session_cb(s,
1376                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1377                 if (s->session->not_resumable)
1378                         /* do not send a session ticket */
1379                         s->tlsext_ticket_expected = 0;
1380                 }
1381         else
1382                 {
1383                 /* Session-id reuse */
1384 #ifdef REUSE_CIPHER_BUG
1385                 STACK_OF(SSL_CIPHER) *sk;
1386                 SSL_CIPHER *nc=NULL;
1387                 SSL_CIPHER *ec=NULL;
1388
1389                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1390                         {
1391                         sk=s->session->ciphers;
1392                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1393                                 {
1394                                 c=sk_SSL_CIPHER_value(sk,i);
1395                                 if (c->algorithm_enc & SSL_eNULL)
1396                                         nc=c;
1397                                 if (SSL_C_IS_EXPORT(c))
1398                                         ec=c;
1399                                 }
1400                         if (nc != NULL)
1401                                 s->s3->tmp.new_cipher=nc;
1402                         else if (ec != NULL)
1403                                 s->s3->tmp.new_cipher=ec;
1404                         else
1405                                 s->s3->tmp.new_cipher=s->session->cipher;
1406                         }
1407                 else
1408 #endif
1409                 s->s3->tmp.new_cipher=s->session->cipher;
1410                 }
1411
1412         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1413                 {
1414                 if (!ssl3_digest_cached_records(s))
1415                         goto f_err;
1416                 }
1417
1418         /* we now have the following setup.
1419          * client_random
1420          * cipher_list          - our prefered list of ciphers
1421          * ciphers              - the clients prefered list of ciphers
1422          * compression          - basically ignored right now
1423          * ssl version is set   - sslv3
1424          * s->session           - The ssl session has been setup.
1425          * s->hit               - session reuse flag
1426          * s->tmp.new_cipher    - the new cipher to use.
1427          */
1428
1429         /* Handles TLS extensions that we couldn't check earlier */
1430         if (s->version >= SSL3_VERSION)
1431                 {
1432                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1433                         {
1434                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1435                         goto err;
1436                         }
1437                 }
1438
1439         if (ret < 0) ret=1;
1440         if (0)
1441                 {
1442 f_err:
1443                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1444                 }
1445 err:
1446         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1447         return(ret);
1448         }
1449
1450 int ssl3_send_server_hello(SSL *s)
1451         {
1452         unsigned char *buf;
1453         unsigned char *p,*d;
1454         int i,sl;
1455         unsigned long l;
1456 #ifdef OPENSSL_NO_TLSEXT
1457         unsigned long Time;
1458 #endif
1459
1460         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1461                 {
1462                 buf=(unsigned char *)s->init_buf->data;
1463 #ifdef OPENSSL_NO_TLSEXT
1464                 p=s->s3->server_random;
1465                 /* Generate server_random if it was not needed previously */
1466                 Time=(unsigned long)time(NULL);                 /* Time */
1467                 l2n(Time,p);
1468                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1469                         return -1;
1470 #endif
1471                 /* Do the message type and length last */
1472                 d=p= ssl_handshake_start(s);
1473
1474                 *(p++)=s->version>>8;
1475                 *(p++)=s->version&0xff;
1476
1477                 /* Random stuff */
1478                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1479                 p+=SSL3_RANDOM_SIZE;
1480
1481                 /* There are several cases for the session ID to send
1482                  * back in the server hello:
1483                  * - For session reuse from the session cache,
1484                  *   we send back the old session ID.
1485                  * - If stateless session reuse (using a session ticket)
1486                  *   is successful, we send back the client's "session ID"
1487                  *   (which doesn't actually identify the session).
1488                  * - If it is a new session, we send back the new
1489                  *   session ID.
1490                  * - However, if we want the new session to be single-use,
1491                  *   we send back a 0-length session ID.
1492                  * s->hit is non-zero in either case of session reuse,
1493                  * so the following won't overwrite an ID that we're supposed
1494                  * to send back.
1495                  */
1496                 if (s->session->not_resumable ||
1497                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1498                                 && !s->hit))
1499                         s->session->session_id_length=0;
1500
1501                 sl=s->session->session_id_length;
1502                 if (sl > (int)sizeof(s->session->session_id))
1503                         {
1504                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1505                         return -1;
1506                         }
1507                 *(p++)=sl;
1508                 memcpy(p,s->session->session_id,sl);
1509                 p+=sl;
1510
1511                 /* put the cipher */
1512                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1513                 p+=i;
1514
1515                 /* put the compression method */
1516 #ifdef OPENSSL_NO_COMP
1517                         *(p++)=0;
1518 #else
1519                 if (s->s3->tmp.new_compression == NULL)
1520                         *(p++)=0;
1521                 else
1522                         *(p++)=s->s3->tmp.new_compression->id;
1523 #endif
1524 #ifndef OPENSSL_NO_TLSEXT
1525                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1526                         {
1527                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1528                         return -1;
1529                         }
1530                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1531                         {
1532                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1533                         return -1;
1534                         }
1535 #endif
1536                 /* do the header */
1537                 l=(p-d);
1538                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1539                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1540                 }
1541
1542         /* SSL3_ST_SW_SRVR_HELLO_B */
1543         return ssl_do_write(s);
1544         }
1545
1546 int ssl3_send_server_done(SSL *s)
1547         {
1548
1549         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1550                 {
1551                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1552                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1553                 }
1554
1555         /* SSL3_ST_SW_SRVR_DONE_B */
1556         return ssl_do_write(s);
1557         }
1558
1559 int ssl3_send_server_key_exchange(SSL *s)
1560         {
1561 #ifndef OPENSSL_NO_RSA
1562         unsigned char *q;
1563         int j,num;
1564         RSA *rsa;
1565         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1566         unsigned int u;
1567 #endif
1568 #ifndef OPENSSL_NO_DH
1569         DH *dh=NULL,*dhp;
1570 #endif
1571 #ifndef OPENSSL_NO_ECDH
1572         EC_KEY *ecdh=NULL, *ecdhp;
1573         unsigned char *encodedPoint = NULL;
1574         int encodedlen = 0;
1575         int curve_id = 0;
1576         BN_CTX *bn_ctx = NULL;
1577 #endif
1578         EVP_PKEY *pkey;
1579         const EVP_MD *md = NULL;
1580         unsigned char *p,*d;
1581         int al,i;
1582         unsigned long type;
1583         int n;
1584         CERT *cert;
1585         BIGNUM *r[4];
1586         int nr[4],kn;
1587         BUF_MEM *buf;
1588         EVP_MD_CTX md_ctx;
1589
1590         EVP_MD_CTX_init(&md_ctx);
1591         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1592                 {
1593                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1594                 cert=s->cert;
1595
1596                 buf=s->init_buf;
1597
1598                 r[0]=r[1]=r[2]=r[3]=NULL;
1599                 n=0;
1600 #ifndef OPENSSL_NO_RSA
1601                 if (type & SSL_kRSA)
1602                         {
1603                         rsa=cert->rsa_tmp;
1604                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1605                                 {
1606                                 rsa=s->cert->rsa_tmp_cb(s,
1607                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1608                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1609                                 if(rsa == NULL)
1610                                 {
1611                                         al=SSL_AD_HANDSHAKE_FAILURE;
1612                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1613                                         goto f_err;
1614                                 }
1615                                 RSA_up_ref(rsa);
1616                                 cert->rsa_tmp=rsa;
1617                                 }
1618                         if (rsa == NULL)
1619                                 {
1620                                 al=SSL_AD_HANDSHAKE_FAILURE;
1621                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1622                                 goto f_err;
1623                                 }
1624                         r[0]=rsa->n;
1625                         r[1]=rsa->e;
1626                         s->s3->tmp.use_rsa_tmp=1;
1627                         }
1628                 else
1629 #endif
1630 #ifndef OPENSSL_NO_DH
1631                         if (type & SSL_kEDH)
1632                         {
1633                         dhp=cert->dh_tmp;
1634                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1635                                 dhp=s->cert->dh_tmp_cb(s,
1636                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1637                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1638                         if (dhp == NULL)
1639                                 {
1640                                 al=SSL_AD_HANDSHAKE_FAILURE;
1641                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1642                                 goto f_err;
1643                                 }
1644
1645                         if (s->s3->tmp.dh != NULL)
1646                                 {
1647                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1648                                 goto err;
1649                                 }
1650
1651                         if ((dh=DHparams_dup(dhp)) == NULL)
1652                                 {
1653                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1654                                 goto err;
1655                                 }
1656
1657                         s->s3->tmp.dh=dh;
1658                         if ((dhp->pub_key == NULL ||
1659                              dhp->priv_key == NULL ||
1660                              (s->options & SSL_OP_SINGLE_DH_USE)))
1661                                 {
1662                                 if(!DH_generate_key(dh))
1663                                     {
1664                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1665                                            ERR_R_DH_LIB);
1666                                     goto err;
1667                                     }
1668                                 }
1669                         else
1670                                 {
1671                                 dh->pub_key=BN_dup(dhp->pub_key);
1672                                 dh->priv_key=BN_dup(dhp->priv_key);
1673                                 if ((dh->pub_key == NULL) ||
1674                                         (dh->priv_key == NULL))
1675                                         {
1676                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1677                                         goto err;
1678                                         }
1679                                 }
1680                         r[0]=dh->p;
1681                         r[1]=dh->g;
1682                         r[2]=dh->pub_key;
1683                         }
1684                 else
1685 #endif
1686 #ifndef OPENSSL_NO_ECDH
1687                         if (type & SSL_kEECDH)
1688                         {
1689                         const EC_GROUP *group;
1690
1691                         ecdhp=cert->ecdh_tmp;
1692                         if (s->cert->ecdh_tmp_auto)
1693                                 {
1694                                 /* Get NID of appropriate shared curve */
1695                                 int nid = tls1_shared_curve(s, -2);
1696                                 if (nid != NID_undef)
1697                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1698                                 }
1699                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1700                                 {
1701                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1702                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1703                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1704                                 }
1705                         if (ecdhp == NULL)
1706                                 {
1707                                 al=SSL_AD_HANDSHAKE_FAILURE;
1708                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1709                                 goto f_err;
1710                                 }
1711
1712                         if (s->s3->tmp.ecdh != NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1715                                 goto err;
1716                                 }
1717
1718                         /* Duplicate the ECDH structure. */
1719                         if (ecdhp == NULL)
1720                                 {
1721                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1722                                 goto err;
1723                                 }
1724                         if (s->cert->ecdh_tmp_auto)
1725                                 ecdh = ecdhp;
1726                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1727                                 {
1728                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1729                                 goto err;
1730                                 }
1731
1732                         s->s3->tmp.ecdh=ecdh;
1733                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1734                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1735                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1736                                 {
1737                                 if(!EC_KEY_generate_key(ecdh))
1738                                     {
1739                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1740                                     goto err;
1741                                     }
1742                                 }
1743
1744                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1745                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1746                             (EC_KEY_get0_private_key(ecdh) == NULL))
1747                                 {
1748                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1749                                 goto err;
1750                                 }
1751
1752                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1753                             (EC_GROUP_get_degree(group) > 163))
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1756                                 goto err;
1757                                 }
1758
1759                         /* XXX: For now, we only support ephemeral ECDH
1760                          * keys over named (not generic) curves. For
1761                          * supported named curves, curve_id is non-zero.
1762                          */
1763                         if ((curve_id =
1764                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1765                             == 0)
1766                                 {
1767                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1768                                 goto err;
1769                                 }
1770
1771                         /* Encode the public key.
1772                          * First check the size of encoding and
1773                          * allocate memory accordingly.
1774                          */
1775                         encodedlen = EC_POINT_point2oct(group,
1776                             EC_KEY_get0_public_key(ecdh),
1777                             POINT_CONVERSION_UNCOMPRESSED,
1778                             NULL, 0, NULL);
1779
1780                         encodedPoint = (unsigned char *)
1781                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1782                         bn_ctx = BN_CTX_new();
1783                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1784                                 {
1785                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1786                                 goto err;
1787                                 }
1788
1789
1790                         encodedlen = EC_POINT_point2oct(group,
1791                             EC_KEY_get0_public_key(ecdh),
1792                             POINT_CONVERSION_UNCOMPRESSED,
1793                             encodedPoint, encodedlen, bn_ctx);
1794
1795                         if (encodedlen == 0)
1796                                 {
1797                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1798                                 goto err;
1799                                 }
1800
1801                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1802
1803                         /* XXX: For now, we only support named (not
1804                          * generic) curves in ECDH ephemeral key exchanges.
1805                          * In this situation, we need four additional bytes
1806                          * to encode the entire ServerECDHParams
1807                          * structure.
1808                          */
1809                         n = 4 + encodedlen;
1810
1811                         /* We'll generate the serverKeyExchange message
1812                          * explicitly so we can set these to NULLs
1813                          */
1814                         r[0]=NULL;
1815                         r[1]=NULL;
1816                         r[2]=NULL;
1817                         r[3]=NULL;
1818                         }
1819                 else
1820 #endif /* !OPENSSL_NO_ECDH */
1821 #ifndef OPENSSL_NO_PSK
1822                         if (type & SSL_kPSK)
1823                                 {
1824                                 /* reserve size for record length and PSK identity hint*/
1825                                 n+=2+strlen(s->ctx->psk_identity_hint);
1826                                 }
1827                         else
1828 #endif /* !OPENSSL_NO_PSK */
1829 #ifndef OPENSSL_NO_SRP
1830                 if (type & SSL_kSRP)
1831                         {
1832                         if ((s->srp_ctx.N == NULL) ||
1833                                 (s->srp_ctx.g == NULL) ||
1834                                 (s->srp_ctx.s == NULL) ||
1835                                 (s->srp_ctx.B == NULL))
1836                                 {
1837                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1838                                 goto err;
1839                                 }
1840                         r[0]=s->srp_ctx.N;
1841                         r[1]=s->srp_ctx.g;
1842                         r[2]=s->srp_ctx.s;
1843                         r[3]=s->srp_ctx.B;
1844                         }
1845                 else
1846 #endif
1847                         {
1848                         al=SSL_AD_HANDSHAKE_FAILURE;
1849                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1850                         goto f_err;
1851                         }
1852                 for (i=0; r[i] != NULL && i<4; i++)
1853                         {
1854                         nr[i]=BN_num_bytes(r[i]);
1855 #ifndef OPENSSL_NO_SRP
1856                         if ((i == 2) && (type & SSL_kSRP))
1857                                 n+=1+nr[i];
1858                         else
1859 #endif
1860                         n+=2+nr[i];
1861                         }
1862
1863                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1864                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1865                         {
1866                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1867                                 == NULL)
1868                                 {
1869                                 al=SSL_AD_DECODE_ERROR;
1870                                 goto f_err;
1871                                 }
1872                         kn=EVP_PKEY_size(pkey);
1873                         }
1874                 else
1875                         {
1876                         pkey=NULL;
1877                         kn=0;
1878                         }
1879
1880                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1881                         {
1882                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1883                         goto err;
1884                         }
1885                 d = p = ssl_handshake_start(s);
1886
1887                 for (i=0; r[i] != NULL && i<4; i++)
1888                         {
1889 #ifndef OPENSSL_NO_SRP
1890                         if ((i == 2) && (type & SSL_kSRP))
1891                                 {
1892                                 *p = nr[i];
1893                                 p++;
1894                                 }
1895                         else
1896 #endif
1897                         s2n(nr[i],p);
1898                         BN_bn2bin(r[i],p);
1899                         p+=nr[i];
1900                         }
1901
1902 #ifndef OPENSSL_NO_ECDH
1903                 if (type & SSL_kEECDH)
1904                         {
1905                         /* XXX: For now, we only support named (not generic) curves.
1906                          * In this situation, the serverKeyExchange message has:
1907                          * [1 byte CurveType], [2 byte CurveName]
1908                          * [1 byte length of encoded point], followed by
1909                          * the actual encoded point itself
1910                          */
1911                         *p = NAMED_CURVE_TYPE;
1912                         p += 1;
1913                         *p = 0;
1914                         p += 1;
1915                         *p = curve_id;
1916                         p += 1;
1917                         *p = encodedlen;
1918                         p += 1;
1919                         memcpy((unsigned char*)p,
1920                             (unsigned char *)encodedPoint,
1921                             encodedlen);
1922                         OPENSSL_free(encodedPoint);
1923                         encodedPoint = NULL;
1924                         p += encodedlen;
1925                         }
1926 #endif
1927
1928 #ifndef OPENSSL_NO_PSK
1929                 if (type & SSL_kPSK)
1930                         {
1931                         /* copy PSK identity hint */
1932                         s2n(strlen(s->ctx->psk_identity_hint), p);
1933                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1934                         p+=strlen(s->ctx->psk_identity_hint);
1935                         }
1936 #endif
1937
1938                 /* not anonymous */
1939                 if (pkey != NULL)
1940                         {
1941                         /* n is the length of the params, they start at &(d[4])
1942                          * and p points to the space at the end. */
1943 #ifndef OPENSSL_NO_RSA
1944                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1945                                 {
1946                                 q=md_buf;
1947                                 j=0;
1948                                 for (num=2; num > 0; num--)
1949                                         {
1950                                         EVP_MD_CTX_set_flags(&md_ctx,
1951                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1952                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1953                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1954                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1955                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1956                                         EVP_DigestUpdate(&md_ctx,d,n);
1957                                         EVP_DigestFinal_ex(&md_ctx,q,
1958                                                 (unsigned int *)&i);
1959                                         q+=i;
1960                                         j+=i;
1961                                         }
1962                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1963                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1964                                         {
1965                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1966                                         goto err;
1967                                         }
1968                                 s2n(u,p);
1969                                 n+=u+2;
1970                                 }
1971                         else
1972 #endif
1973                         if (md)
1974                                 {
1975                                 /* send signature algorithm */
1976                                 if (SSL_USE_SIGALGS(s))
1977                                         {
1978                                         if (!tls12_get_sigandhash(p, pkey, md))
1979                                                 {
1980                                                 /* Should never happen */
1981                                                 al=SSL_AD_INTERNAL_ERROR;
1982                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1983                                                 goto f_err;
1984                                                 }
1985                                         p+=2;
1986                                         }
1987 #ifdef SSL_DEBUG
1988                                 fprintf(stderr, "Using hash %s\n",
1989                                                         EVP_MD_name(md));
1990 #endif
1991                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1992                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1993                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1994                                 EVP_SignUpdate(&md_ctx,d,n);
1995                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1996                                         (unsigned int *)&i,pkey))
1997                                         {
1998                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1999                                         goto err;
2000                                         }
2001                                 s2n(i,p);
2002                                 n+=i+2;
2003                                 if (SSL_USE_SIGALGS(s))
2004                                         n+= 2;
2005                                 }
2006                         else
2007                                 {
2008                                 /* Is this error check actually needed? */
2009                                 al=SSL_AD_HANDSHAKE_FAILURE;
2010                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2011                                 goto f_err;
2012                                 }
2013                         }
2014
2015                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2016                 }
2017
2018         s->state = SSL3_ST_SW_KEY_EXCH_B;
2019         EVP_MD_CTX_cleanup(&md_ctx);
2020         return ssl_do_write(s);
2021 f_err:
2022         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2023 err:
2024 #ifndef OPENSSL_NO_ECDH
2025         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2026         BN_CTX_free(bn_ctx);
2027 #endif
2028         EVP_MD_CTX_cleanup(&md_ctx);
2029         return(-1);
2030         }
2031
2032 int ssl3_send_certificate_request(SSL *s)
2033         {
2034         unsigned char *p,*d;
2035         int i,j,nl,off,n;
2036         STACK_OF(X509_NAME) *sk=NULL;
2037         X509_NAME *name;
2038         BUF_MEM *buf;
2039
2040         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2041                 {
2042                 buf=s->init_buf;
2043
2044                 d=p=ssl_handshake_start(s);
2045
2046                 /* get the list of acceptable cert types */
2047                 p++;
2048                 n=ssl3_get_req_cert_type(s,p);
2049                 d[0]=n;
2050                 p+=n;
2051                 n++;
2052
2053                 if (SSL_USE_SIGALGS(s))
2054                         {
2055                         const unsigned char *psigs;
2056                         nl = tls12_get_psigalgs(s, &psigs);
2057                         s2n(nl, p);
2058                         memcpy(p, psigs, nl);
2059                         p += nl;
2060                         n += nl + 2;
2061                         }
2062
2063                 off=n;
2064                 p+=2;
2065                 n+=2;
2066
2067                 sk=SSL_get_client_CA_list(s);
2068                 nl=0;
2069                 if (sk != NULL)
2070                         {
2071                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2072                                 {
2073                                 name=sk_X509_NAME_value(sk,i);
2074                                 j=i2d_X509_NAME(name,NULL);
2075                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2076                                         {
2077                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2078                                         goto err;
2079                                         }
2080                                 p=(unsigned char *)&(buf->data[4+n]);
2081                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2082                                         {
2083                                         s2n(j,p);
2084                                         i2d_X509_NAME(name,&p);
2085                                         n+=2+j;
2086                                         nl+=2+j;
2087                                         }
2088                                 else
2089                                         {
2090                                         d=p;
2091                                         i2d_X509_NAME(name,&p);
2092                                         j-=2; s2n(j,d); j+=2;
2093                                         n+=j;
2094                                         nl+=j;
2095                                         }
2096                                 }
2097                         }
2098                 /* else no CA names */
2099                 p = ssl_handshake_start(s) + off;
2100                 s2n(nl,p);
2101
2102                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2103
2104 #ifdef NETSCAPE_HANG_BUG
2105                 if (!SSL_IS_DTLS(s))
2106                         {
2107                         p=(unsigned char *)s->init_buf->data + s->init_num;
2108                         /* do the header */
2109                         *(p++)=SSL3_MT_SERVER_DONE;
2110                         *(p++)=0;
2111                         *(p++)=0;
2112                         *(p++)=0;
2113                         s->init_num += 4;
2114                         }
2115 #endif
2116
2117                 s->state = SSL3_ST_SW_CERT_REQ_B;
2118                 }
2119
2120         /* SSL3_ST_SW_CERT_REQ_B */
2121         return ssl_do_write(s);
2122 err:
2123         return(-1);
2124         }
2125
2126 int ssl3_get_client_key_exchange(SSL *s)
2127         {
2128         int i,al,ok;
2129         long n;
2130         unsigned long alg_k;
2131         unsigned char *p;
2132 #ifndef OPENSSL_NO_RSA
2133         RSA *rsa=NULL;
2134         EVP_PKEY *pkey=NULL;
2135 #endif
2136 #ifndef OPENSSL_NO_DH
2137         BIGNUM *pub=NULL;
2138         DH *dh_srvr, *dh_clnt = NULL;
2139 #endif
2140 #ifndef OPENSSL_NO_KRB5
2141         KSSL_ERR kssl_err;
2142 #endif /* OPENSSL_NO_KRB5 */
2143
2144 #ifndef OPENSSL_NO_ECDH
2145         EC_KEY *srvr_ecdh = NULL;
2146         EVP_PKEY *clnt_pub_pkey = NULL;
2147         EC_POINT *clnt_ecpoint = NULL;
2148         BN_CTX *bn_ctx = NULL;
2149 #endif
2150
2151         n=s->method->ssl_get_message(s,
2152                 SSL3_ST_SR_KEY_EXCH_A,
2153                 SSL3_ST_SR_KEY_EXCH_B,
2154                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2155                 2048, /* ??? */
2156                 &ok);
2157
2158         if (!ok) return((int)n);
2159         p=(unsigned char *)s->init_msg;
2160
2161         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2162
2163 #ifndef OPENSSL_NO_RSA
2164         if (alg_k & SSL_kRSA)
2165                 {
2166                 /* FIX THIS UP EAY EAY EAY EAY */
2167                 if (s->s3->tmp.use_rsa_tmp)
2168                         {
2169                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2170                                 rsa=s->cert->rsa_tmp;
2171                         /* Don't do a callback because rsa_tmp should
2172                          * be sent already */
2173                         if (rsa == NULL)
2174                                 {
2175                                 al=SSL_AD_HANDSHAKE_FAILURE;
2176                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2177                                 goto f_err;
2178
2179                                 }
2180                         }
2181                 else
2182                         {
2183                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2184                         if (    (pkey == NULL) ||
2185                                 (pkey->type != EVP_PKEY_RSA) ||
2186                                 (pkey->pkey.rsa == NULL))
2187                                 {
2188                                 al=SSL_AD_HANDSHAKE_FAILURE;
2189                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2190                                 goto f_err;
2191                                 }
2192                         rsa=pkey->pkey.rsa;
2193                         }
2194
2195                 /* TLS and [incidentally] DTLS{0xFEFF} */
2196                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2197                         {
2198                         n2s(p,i);
2199                         if (n != i+2)
2200                                 {
2201                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2202                                         {
2203                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2204                                         goto err;
2205                                         }
2206                                 else
2207                                         p-=2;
2208                                 }
2209                         else
2210                                 n=i;
2211                         }
2212
2213                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2214
2215                 al = -1;
2216
2217                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2218                         {
2219                         al=SSL_AD_DECODE_ERROR;
2220                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2221                         }
2222
2223                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2224                         {
2225                         /* The premaster secret must contain the same version number as the
2226                          * ClientHello to detect version rollback attacks (strangely, the
2227                          * protocol does not offer such protection for DH ciphersuites).
2228                          * However, buggy clients exist that send the negotiated protocol
2229                          * version instead if the server does not support the requested
2230                          * protocol version.
2231                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2232                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2233                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2234                                 {
2235                                 al=SSL_AD_DECODE_ERROR;
2236                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2237
2238                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2239                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2240                                  * number check as a "bad version oracle" -- an alert would
2241                                  * reveal that the plaintext corresponding to some ciphertext
2242                                  * made up by the adversary is properly formatted except
2243                                  * that the version number is wrong.  To avoid such attacks,
2244                                  * we should treat this just like any other decryption error. */
2245                                 }
2246                         }
2247
2248                 if (al != -1)
2249                         {
2250                         /* Some decryption failure -- use random value instead as countermeasure
2251                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2252                          * (see RFC 2246, section 7.4.7.1). */
2253                         ERR_clear_error();
2254                         i = SSL_MAX_MASTER_KEY_LENGTH;
2255                         p[0] = s->client_version >> 8;
2256                         p[1] = s->client_version & 0xff;
2257                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2258                                 goto err;
2259                         }
2260
2261                 s->session->master_key_length=
2262                         s->method->ssl3_enc->generate_master_secret(s,
2263                                 s->session->master_key,
2264                                 p,i);
2265                 OPENSSL_cleanse(p,i);
2266                 }
2267         else
2268 #endif
2269 #ifndef OPENSSL_NO_DH
2270                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2271                 {
2272                 int idx = -1;
2273                 EVP_PKEY *skey = NULL;
2274                 if (n)
2275                         n2s(p,i);
2276                 else
2277                         i = 0;
2278                 if (n && n != i+2)
2279                         {
2280                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2281                                 {
2282                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2283                                 goto err;
2284                                 }
2285                         else
2286                                 {
2287                                 p-=2;
2288                                 i=(int)n;
2289                                 }
2290                         }
2291                 if (alg_k & SSL_kDHr)
2292                         idx = SSL_PKEY_DH_RSA;
2293                 else if (alg_k & SSL_kDHd)
2294                         idx = SSL_PKEY_DH_DSA;
2295                 if (idx >= 0)
2296                         {
2297                         skey = s->cert->pkeys[idx].privatekey;
2298                         if ((skey == NULL) ||
2299                                 (skey->type != EVP_PKEY_DH) ||
2300                                 (skey->pkey.dh == NULL))
2301                                 {
2302                                 al=SSL_AD_HANDSHAKE_FAILURE;
2303                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2304                                 goto f_err;
2305                                 }
2306                         dh_srvr = skey->pkey.dh;
2307                         }
2308                 else if (s->s3->tmp.dh == NULL)
2309                         {
2310                         al=SSL_AD_HANDSHAKE_FAILURE;
2311                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2312                         goto f_err;
2313                         }
2314                 else
2315                         dh_srvr=s->s3->tmp.dh;
2316
2317                 if (n == 0L)
2318                         {
2319                         /* Get pubkey from cert */
2320                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2321                         if (clkey)
2322                                 {
2323                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2324                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2325                                 }
2326                         if (dh_clnt == NULL)
2327                                 {
2328                                 al=SSL_AD_HANDSHAKE_FAILURE;
2329                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2330                                 goto f_err;
2331                                 }
2332                         EVP_PKEY_free(clkey);
2333                         pub = dh_clnt->pub_key;
2334                         }
2335                 else
2336                         pub=BN_bin2bn(p,i,NULL);
2337                 if (pub == NULL)
2338                         {
2339                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2340                         goto err;
2341                         }
2342
2343                 i=DH_compute_key(p,pub,dh_srvr);
2344
2345                 if (i <= 0)
2346                         {
2347                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2348                         BN_clear_free(pub);
2349                         goto err;
2350                         }
2351
2352                 DH_free(s->s3->tmp.dh);
2353                 s->s3->tmp.dh=NULL;
2354                 if (dh_clnt)
2355                         DH_free(dh_clnt);
2356                 else
2357                         BN_clear_free(pub);
2358                 pub=NULL;
2359                 s->session->master_key_length=
2360                         s->method->ssl3_enc->generate_master_secret(s,
2361                                 s->session->master_key,p,i);
2362                 OPENSSL_cleanse(p,i);
2363                 if (dh_clnt)
2364                         return 2;
2365                 }
2366         else
2367 #endif
2368 #ifndef OPENSSL_NO_KRB5
2369         if (alg_k & SSL_kKRB5)
2370                 {
2371                 krb5_error_code         krb5rc;
2372                 krb5_data               enc_ticket;
2373                 krb5_data               authenticator;
2374                 krb5_data               enc_pms;
2375                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2376                 EVP_CIPHER_CTX          ciph_ctx;
2377                 const EVP_CIPHER        *enc = NULL;
2378                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2379                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2380                                                + EVP_MAX_BLOCK_LENGTH];
2381                 int                  padl, outl;
2382                 krb5_timestamp          authtime = 0;
2383                 krb5_ticket_times       ttimes;
2384
2385                 EVP_CIPHER_CTX_init(&ciph_ctx);
2386
2387                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2388
2389                 n2s(p,i);
2390                 enc_ticket.length = i;
2391
2392                 if (n < (long)(enc_ticket.length + 6))
2393                         {
2394                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2395                                 SSL_R_DATA_LENGTH_TOO_LONG);
2396                         goto err;
2397                         }
2398
2399                 enc_ticket.data = (char *)p;
2400                 p+=enc_ticket.length;
2401
2402                 n2s(p,i);
2403                 authenticator.length = i;
2404
2405                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2406                         {
2407                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2408                                 SSL_R_DATA_LENGTH_TOO_LONG);
2409                         goto err;
2410                         }
2411
2412                 authenticator.data = (char *)p;
2413                 p+=authenticator.length;
2414
2415                 n2s(p,i);
2416                 enc_pms.length = i;
2417                 enc_pms.data = (char *)p;
2418                 p+=enc_pms.length;
2419
2420                 /* Note that the length is checked again below,
2421                 ** after decryption
2422                 */
2423                 if(enc_pms.length > sizeof pms)
2424                         {
2425                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2426                                SSL_R_DATA_LENGTH_TOO_LONG);
2427                         goto err;
2428                         }
2429
2430                 if (n != (long)(enc_ticket.length + authenticator.length +
2431                                                 enc_pms.length + 6))
2432                         {
2433                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2434                                 SSL_R_DATA_LENGTH_TOO_LONG);
2435                         goto err;
2436                         }
2437
2438                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2439                                         &kssl_err)) != 0)
2440                         {
2441 #ifdef KSSL_DEBUG
2442                         printf("kssl_sget_tkt rtn %d [%d]\n",
2443                                 krb5rc, kssl_err.reason);
2444                         if (kssl_err.text)
2445                                 printf("kssl_err text= %s\n", kssl_err.text);
2446 #endif  /* KSSL_DEBUG */
2447                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2448                                 kssl_err.reason);
2449                         goto err;
2450                         }
2451
2452                 /*  Note: no authenticator is not considered an error,
2453                 **  but will return authtime == 0.
2454                 */
2455                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2456                                         &authtime, &kssl_err)) != 0)
2457                         {
2458 #ifdef KSSL_DEBUG
2459                         printf("kssl_check_authent rtn %d [%d]\n",
2460                                 krb5rc, kssl_err.reason);
2461                         if (kssl_err.text)
2462                                 printf("kssl_err text= %s\n", kssl_err.text);
2463 #endif  /* KSSL_DEBUG */
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                 kssl_err.reason);
2466                         goto err;
2467                         }
2468
2469                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2470                         {
2471                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2472                         goto err;
2473                         }
2474
2475 #ifdef KSSL_DEBUG
2476                 kssl_ctx_show(kssl_ctx);
2477 #endif  /* KSSL_DEBUG */
2478
2479                 enc = kssl_map_enc(kssl_ctx->enctype);
2480                 if (enc == NULL)
2481                     goto err;
2482
2483                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2484
2485                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 SSL_R_DECRYPTION_FAILED);
2489                         goto err;
2490                         }
2491                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2492                                         (unsigned char *)enc_pms.data, enc_pms.length))
2493                         {
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2495                                 SSL_R_DECRYPTION_FAILED);
2496                         goto err;
2497                         }
2498                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2499                         {
2500                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2501                                 SSL_R_DATA_LENGTH_TOO_LONG);
2502                         goto err;
2503                         }
2504                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2505                         {
2506                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2507                                 SSL_R_DECRYPTION_FAILED);
2508                         goto err;
2509                         }
2510                 outl += padl;
2511                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2512                         {
2513                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2514                                 SSL_R_DATA_LENGTH_TOO_LONG);
2515                         goto err;
2516                         }
2517                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2518                     {
2519                     /* The premaster secret must contain the same version number as the
2520                      * ClientHello to detect version rollback attacks (strangely, the
2521                      * protocol does not offer such protection for DH ciphersuites).
2522                      * However, buggy clients exist that send random bytes instead of
2523                      * the protocol version.
2524                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2525                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2526                      */
2527                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2528                         {
2529                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2530                                SSL_AD_DECODE_ERROR);
2531                         goto err;
2532                         }
2533                     }
2534
2535                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2536
2537                 s->session->master_key_length=
2538                         s->method->ssl3_enc->generate_master_secret(s,
2539                                 s->session->master_key, pms, outl);
2540
2541                 if (kssl_ctx->client_princ)
2542                         {
2543                         size_t len = strlen(kssl_ctx->client_princ);
2544                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2545                                 {
2546                                 s->session->krb5_client_princ_len = len;
2547                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2548                                 }
2549                         }
2550
2551
2552                 /*  Was doing kssl_ctx_free() here,
2553                 **  but it caused problems for apache.
2554                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2555                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2556                 */
2557                 }
2558         else
2559 #endif  /* OPENSSL_NO_KRB5 */
2560
2561 #ifndef OPENSSL_NO_ECDH
2562                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2563                 {
2564                 int ret = 1;
2565                 int field_size = 0;
2566                 const EC_KEY   *tkey;
2567                 const EC_GROUP *group;
2568                 const BIGNUM *priv_key;
2569
2570                 /* initialize structures for server's ECDH key pair */
2571                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2572                         {
2573                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2574                             ERR_R_MALLOC_FAILURE);
2575                         goto err;
2576                         }
2577
2578                 /* Let's get server private key and group information */
2579                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2580                         {
2581                         /* use the certificate */
2582                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2583                         }
2584                 else
2585                         {
2586                         /* use the ephermeral values we saved when
2587                          * generating the ServerKeyExchange msg.
2588                          */
2589                         tkey = s->s3->tmp.ecdh;
2590                         }
2591
2592                 group    = EC_KEY_get0_group(tkey);
2593                 priv_key = EC_KEY_get0_private_key(tkey);
2594
2595                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2596                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2597                         {
2598                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2599                                ERR_R_EC_LIB);
2600                         goto err;
2601                         }
2602
2603                 /* Let's get client's public key */
2604                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2605                         {
2606                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2607                             ERR_R_MALLOC_FAILURE);
2608                         goto err;
2609                         }
2610
2611                 if (n == 0L)
2612                         {
2613                         /* Client Publickey was in Client Certificate */
2614
2615                          if (alg_k & SSL_kEECDH)
2616                                  {
2617                                  al=SSL_AD_HANDSHAKE_FAILURE;
2618                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2619                                  goto f_err;
2620                                  }
2621                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2622                             == NULL) ||
2623                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2624                                 {
2625                                 /* XXX: For now, we do not support client
2626                                  * authentication using ECDH certificates
2627                                  * so this branch (n == 0L) of the code is
2628                                  * never executed. When that support is
2629                                  * added, we ought to ensure the key
2630                                  * received in the certificate is
2631                                  * authorized for key agreement.
2632                                  * ECDH_compute_key implicitly checks that
2633                                  * the two ECDH shares are for the same
2634                                  * group.
2635                                  */
2636                                 al=SSL_AD_HANDSHAKE_FAILURE;
2637                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2638                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2639                                 goto f_err;
2640                                 }
2641
2642                         if (EC_POINT_copy(clnt_ecpoint,
2643                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2644                                 {
2645                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2646                                         ERR_R_EC_LIB);
2647                                 goto err;
2648                                 }
2649                         ret = 2; /* Skip certificate verify processing */
2650                         }
2651                 else
2652                         {
2653                         /* Get client's public key from encoded point
2654                          * in the ClientKeyExchange message.
2655                          */
2656                         if ((bn_ctx = BN_CTX_new()) == NULL)
2657                                 {
2658                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2659                                     ERR_R_MALLOC_FAILURE);
2660                                 goto err;
2661                                 }
2662
2663                         /* Get encoded point length */
2664                         i = *p;
2665                         p += 1;
2666                         if (n != 1 + i)
2667                                 {
2668                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2669                                     ERR_R_EC_LIB);
2670                                 goto err;
2671                                 }
2672                         if (EC_POINT_oct2point(group,
2673                             clnt_ecpoint, p, i, bn_ctx) == 0)
2674                                 {
2675                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2676                                     ERR_R_EC_LIB);
2677                                 goto err;
2678                                 }
2679                         /* p is pointing to somewhere in the buffer
2680                          * currently, so set it to the start
2681                          */
2682                         p=(unsigned char *)s->init_buf->data;
2683                         }
2684
2685                 /* Compute the shared pre-master secret */
2686                 field_size = EC_GROUP_get_degree(group);
2687                 if (field_size <= 0)
2688                         {
2689                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2690                                ERR_R_ECDH_LIB);
2691                         goto err;
2692                         }
2693                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2694                 if (i <= 0)
2695                         {
2696                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2697                             ERR_R_ECDH_LIB);
2698                         goto err;
2699                         }
2700
2701                 EVP_PKEY_free(clnt_pub_pkey);
2702                 EC_POINT_free(clnt_ecpoint);
2703                 EC_KEY_free(srvr_ecdh);
2704                 BN_CTX_free(bn_ctx);
2705                 EC_KEY_free(s->s3->tmp.ecdh);
2706                 s->s3->tmp.ecdh = NULL;
2707
2708                 /* Compute the master secret */
2709                 s->session->master_key_length = s->method->ssl3_enc-> \
2710                     generate_master_secret(s, s->session->master_key, p, i);
2711
2712                 OPENSSL_cleanse(p, i);
2713                 return (ret);
2714                 }
2715         else
2716 #endif
2717 #ifndef OPENSSL_NO_PSK
2718                 if (alg_k & SSL_kPSK)
2719                         {
2720                         unsigned char *t = NULL;
2721                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2722                         unsigned int pre_ms_len = 0, psk_len = 0;
2723                         int psk_err = 1;
2724                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2725
2726                         al=SSL_AD_HANDSHAKE_FAILURE;
2727
2728                         n2s(p,i);
2729                         if (n != i+2)
2730                                 {
2731                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2732                                         SSL_R_LENGTH_MISMATCH);
2733                                 goto psk_err;
2734                                 }
2735                         if (i > PSK_MAX_IDENTITY_LEN)
2736                                 {
2737                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2738                                         SSL_R_DATA_LENGTH_TOO_LONG);
2739                                 goto psk_err;
2740                                 }
2741                         if (s->psk_server_callback == NULL)
2742                                 {
2743                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2744                                        SSL_R_PSK_NO_SERVER_CB);
2745                                 goto psk_err;
2746                                 }
2747
2748                         /* Create guaranteed NULL-terminated identity
2749                          * string for the callback */
2750                         memcpy(tmp_id, p, i);
2751                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2752                         psk_len = s->psk_server_callback(s, tmp_id,
2753                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2754                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2755
2756                         if (psk_len > PSK_MAX_PSK_LEN)
2757                                 {
2758                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2759                                         ERR_R_INTERNAL_ERROR);
2760                                 goto psk_err;
2761                                 }
2762                         else if (psk_len == 0)
2763                                 {
2764                                 /* PSK related to the given identity not found */
2765                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2766                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2767                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2768                                 goto psk_err;
2769                                 }
2770
2771                         /* create PSK pre_master_secret */
2772                         pre_ms_len=2+psk_len+2+psk_len;
2773                         t = psk_or_pre_ms;
2774                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2775                         s2n(psk_len, t);
2776                         memset(t, 0, psk_len);
2777                         t+=psk_len;
2778                         s2n(psk_len, t);
2779
2780                         if (s->session->psk_identity != NULL)
2781                                 OPENSSL_free(s->session->psk_identity);
2782                         s->session->psk_identity = BUF_strdup((char *)p);
2783                         if (s->session->psk_identity == NULL)
2784                                 {
2785                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2786                                         ERR_R_MALLOC_FAILURE);
2787                                 goto psk_err;
2788                                 }
2789
2790                         if (s->session->psk_identity_hint != NULL)
2791                                 OPENSSL_free(s->session->psk_identity_hint);
2792                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2793                         if (s->ctx->psk_identity_hint != NULL &&
2794                                 s->session->psk_identity_hint == NULL)
2795                                 {
2796                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2797                                         ERR_R_MALLOC_FAILURE);
2798                                 goto psk_err;
2799                                 }
2800
2801                         s->session->master_key_length=
2802                                 s->method->ssl3_enc->generate_master_secret(s,
2803                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2804                         psk_err = 0;
2805                 psk_err:
2806                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2807                         if (psk_err != 0)
2808                                 goto f_err;
2809                         }
2810                 else
2811 #endif
2812 #ifndef OPENSSL_NO_SRP
2813                 if (alg_k & SSL_kSRP)
2814                         {
2815                         int param_len;
2816
2817                         n2s(p,i);
2818                         param_len=i+2;
2819                         if (param_len > n)
2820                                 {
2821                                 al=SSL_AD_DECODE_ERROR;
2822                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2823                                 goto f_err;
2824                                 }
2825                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2826                                 {
2827                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2828                                 goto err;
2829                                 }
2830                         if (s->session->srp_username != NULL)
2831                                 OPENSSL_free(s->session->srp_username);
2832                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2833                         if (s->session->srp_username == NULL)
2834                                 {
2835                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2836                                         ERR_R_MALLOC_FAILURE);
2837                                 goto err;
2838                                 }
2839
2840                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2841                                 {
2842                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2843                                 goto err;
2844                                 }
2845
2846                         p+=i;
2847                         }
2848                 else
2849 #endif  /* OPENSSL_NO_SRP */
2850                 if (alg_k & SSL_kGOST)
2851                         {
2852                         int ret = 0;
2853                         EVP_PKEY_CTX *pkey_ctx;
2854                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2855                         unsigned char premaster_secret[32], *start;
2856                         size_t outlen=32, inlen;
2857                         unsigned long alg_a;
2858
2859                         /* Get our certificate private key*/
2860                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2861                         if (alg_a & SSL_aGOST94)
2862                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2863                         else if (alg_a & SSL_aGOST01)
2864                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2865
2866                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2867                         EVP_PKEY_decrypt_init(pkey_ctx);
2868                         /* If client certificate is present and is of the same type, maybe
2869                          * use it for key exchange.  Don't mind errors from
2870                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2871                          * a client certificate for authorization only. */
2872                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2873                         if (client_pub_pkey)
2874                                 {
2875                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2876                                         ERR_clear_error();
2877                                 }
2878                         /* Decrypt session key */
2879                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2880                                 {
2881                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2882                                 goto gerr;
2883                                 }
2884                         if (p[1] == 0x81)
2885                                 {
2886                                 start = p+3;
2887                                 inlen = p[2];
2888                                 }
2889                         else if (p[1] < 0x80)
2890                                 {
2891                                 start = p+2;
2892                                 inlen = p[1];
2893                                 }
2894                         else
2895                                 {
2896                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2897                                 goto gerr;
2898                                 }
2899                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2900
2901                                 {
2902                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2903                                 goto gerr;
2904                                 }
2905                         /* Generate master secret */
2906                         s->session->master_key_length=
2907                                 s->method->ssl3_enc->generate_master_secret(s,
2908                                         s->session->master_key,premaster_secret,32);
2909                         /* Check if pubkey from client certificate was used */
2910                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2911                                 ret = 2;
2912                         else
2913                                 ret = 1;
2914                 gerr:
2915                         EVP_PKEY_free(client_pub_pkey);
2916                         EVP_PKEY_CTX_free(pkey_ctx);
2917                         if (ret)
2918                                 return ret;
2919                         else
2920                                 goto err;
2921                         }
2922                 else
2923                 {
2924                 al=SSL_AD_HANDSHAKE_FAILURE;
2925                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2926                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2927                 goto f_err;
2928                 }
2929
2930         return(1);
2931 f_err:
2932         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2933 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2934 err:
2935 #endif
2936 #ifndef OPENSSL_NO_ECDH
2937         EVP_PKEY_free(clnt_pub_pkey);
2938         EC_POINT_free(clnt_ecpoint);
2939         if (srvr_ecdh != NULL)
2940                 EC_KEY_free(srvr_ecdh);
2941         BN_CTX_free(bn_ctx);
2942 #endif
2943         return(-1);
2944         }
2945
2946 int ssl3_get_cert_verify(SSL *s)
2947         {
2948         EVP_PKEY *pkey=NULL;
2949         unsigned char *p;
2950         int al,ok,ret=0;
2951         long n;
2952         int type=0,i,j;
2953         X509 *peer;
2954         const EVP_MD *md = NULL;
2955         EVP_MD_CTX mctx;
2956         EVP_MD_CTX_init(&mctx);
2957
2958         n=s->method->ssl_get_message(s,
2959                 SSL3_ST_SR_CERT_VRFY_A,
2960                 SSL3_ST_SR_CERT_VRFY_B,
2961                 -1,
2962                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2963                 &ok);
2964
2965         if (!ok) return((int)n);
2966
2967         if (s->session->peer != NULL)
2968                 {
2969                 peer=s->session->peer;
2970                 pkey=X509_get_pubkey(peer);
2971                 type=X509_certificate_type(peer,pkey);
2972                 }
2973         else
2974                 {
2975                 peer=NULL;
2976                 pkey=NULL;
2977                 }
2978
2979         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2980                 {
2981                 s->s3->tmp.reuse_message=1;
2982                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2983                         {
2984                         al=SSL_AD_UNEXPECTED_MESSAGE;
2985                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2986                         goto f_err;
2987                         }
2988                 ret=1;
2989                 goto end;
2990                 }
2991
2992         if (peer == NULL)
2993                 {
2994                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2995                 al=SSL_AD_UNEXPECTED_MESSAGE;
2996                 goto f_err;
2997                 }
2998
2999         if (!(type & EVP_PKT_SIGN))
3000                 {
3001                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3002                 al=SSL_AD_ILLEGAL_PARAMETER;
3003                 goto f_err;
3004                 }
3005
3006         if (s->s3->change_cipher_spec)
3007                 {
3008                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3009                 al=SSL_AD_UNEXPECTED_MESSAGE;
3010                 goto f_err;
3011                 }
3012
3013         /* we now have a signature that we need to verify */
3014         p=(unsigned char *)s->init_msg;
3015         /* Check for broken implementations of GOST ciphersuites */
3016         /* If key is GOST and n is exactly 64, it is bare
3017          * signature without length field */
3018         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3019                 pkey->type == NID_id_GostR3410_2001) )
3020                 {
3021                 i=64;
3022                 }
3023         else
3024                 {
3025                 if (SSL_USE_SIGALGS(s))
3026                         {
3027                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3028                         if (rv == -1)
3029                                 {
3030                                 al = SSL_AD_INTERNAL_ERROR;
3031                                 goto f_err;
3032                                 }
3033                         else if (rv == 0)
3034                                 {
3035                                 al = SSL_AD_DECODE_ERROR;
3036                                 goto f_err;
3037                                 }
3038 #ifdef SSL_DEBUG
3039 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3040 #endif
3041                         p += 2;
3042                         n -= 2;
3043                         }
3044                 n2s(p,i);
3045                 n-=2;
3046                 if (i > n)
3047                         {
3048                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3049                         al=SSL_AD_DECODE_ERROR;
3050                         goto f_err;
3051                         }
3052         }
3053         j=EVP_PKEY_size(pkey);
3054         if ((i > j) || (n > j) || (n <= 0))
3055                 {
3056                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3057                 al=SSL_AD_DECODE_ERROR;
3058                 goto f_err;
3059                 }
3060
3061         if (SSL_USE_SIGALGS(s))
3062                 {
3063                 long hdatalen = 0;
3064                 void *hdata;
3065                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3066                 if (hdatalen <= 0)
3067                         {
3068                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3069                         al=SSL_AD_INTERNAL_ERROR;
3070                         goto f_err;
3071                         }
3072 #ifdef SSL_DEBUG
3073                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3074                                                         EVP_MD_name(md));
3075 #endif
3076                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3077                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3078                         {
3079                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3080                         al=SSL_AD_INTERNAL_ERROR;
3081                         goto f_err;
3082                         }
3083
3084                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3085                         {
3086                         al=SSL_AD_DECRYPT_ERROR;
3087                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3088                         goto f_err;
3089                         }
3090                 }
3091         else
3092 #ifndef OPENSSL_NO_RSA
3093         if (pkey->type == EVP_PKEY_RSA)
3094                 {
3095                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3096                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3097                                                         pkey->pkey.rsa);
3098                 if (i < 0)
3099                         {
3100                         al=SSL_AD_DECRYPT_ERROR;
3101                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3102                         goto f_err;
3103                         }
3104                 if (i == 0)
3105                         {
3106                         al=SSL_AD_DECRYPT_ERROR;
3107                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3108                         goto f_err;
3109                         }
3110                 }
3111         else
3112 #endif
3113 #ifndef OPENSSL_NO_DSA
3114                 if (pkey->type == EVP_PKEY_DSA)
3115                 {
3116                 j=DSA_verify(pkey->save_type,
3117                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3118                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3119                 if (j <= 0)
3120                         {
3121                         /* bad signature */
3122                         al=SSL_AD_DECRYPT_ERROR;
3123                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3124                         goto f_err;
3125                         }
3126                 }
3127         else
3128 #endif
3129 #ifndef OPENSSL_NO_ECDSA
3130                 if (pkey->type == EVP_PKEY_EC)
3131                 {
3132                 j=ECDSA_verify(pkey->save_type,
3133                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3134                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3135                 if (j <= 0)
3136                         {
3137                         /* bad signature */
3138                         al=SSL_AD_DECRYPT_ERROR;
3139                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3140                             SSL_R_BAD_ECDSA_SIGNATURE);
3141                         goto f_err;
3142                         }
3143                 }
3144         else
3145 #endif
3146         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3147                 {   unsigned char signature[64];
3148                         int idx;
3149                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3150                         EVP_PKEY_verify_init(pctx);
3151                         if (i!=64) {
3152                                 fprintf(stderr,"GOST signature length is %d",i);
3153                         }
3154                         for (idx=0;idx<64;idx++) {
3155                                 signature[63-idx]=p[idx];
3156                         }
3157                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3158                         EVP_PKEY_CTX_free(pctx);
3159                         if (j<=0)
3160                                 {
3161                                 al=SSL_AD_DECRYPT_ERROR;
3162                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3163                                         SSL_R_BAD_ECDSA_SIGNATURE);
3164                                 goto f_err;
3165                                 }
3166                 }
3167         else
3168                 {
3169                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3170                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3171                 goto f_err;
3172                 }
3173
3174
3175         ret=1;
3176         if (0)
3177                 {
3178 f_err:
3179                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3180                 }
3181 end:
3182         if (s->s3->handshake_buffer)
3183                 {
3184                 BIO_free(s->s3->handshake_buffer);
3185                 s->s3->handshake_buffer = NULL;
3186                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3187                 }
3188         EVP_MD_CTX_cleanup(&mctx);
3189         EVP_PKEY_free(pkey);
3190         return(ret);
3191         }
3192
3193 int ssl3_get_client_certificate(SSL *s)
3194         {
3195         int i,ok,al,ret= -1;
3196         X509 *x=NULL;
3197         unsigned long l,nc,llen,n;
3198         const unsigned char *p,*q;
3199         unsigned char *d;
3200         STACK_OF(X509) *sk=NULL;
3201
3202         n=s->method->ssl_get_message(s,
3203                 SSL3_ST_SR_CERT_A,
3204                 SSL3_ST_SR_CERT_B,
3205                 -1,
3206                 s->max_cert_list,
3207                 &ok);
3208
3209         if (!ok) return((int)n);
3210
3211         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3212                 {
3213                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3214                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3215                         {
3216                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3217                         al=SSL_AD_HANDSHAKE_FAILURE;
3218                         goto f_err;
3219                         }
3220                 /* If tls asked for a client cert, the client must return a 0 list */
3221                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3222                         {
3223                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3224                         al=SSL_AD_UNEXPECTED_MESSAGE;
3225                         goto f_err;
3226                         }
3227                 s->s3->tmp.reuse_message=1;
3228                 return(1);
3229                 }
3230
3231         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3232                 {
3233                 al=SSL_AD_UNEXPECTED_MESSAGE;
3234                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3235                 goto f_err;
3236                 }
3237         p=d=(unsigned char *)s->init_msg;
3238
3239         if ((sk=sk_X509_new_null()) == NULL)
3240                 {
3241                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3242                 goto err;
3243                 }
3244
3245         n2l3(p,llen);
3246         if (llen+3 != n)
3247                 {
3248                 al=SSL_AD_DECODE_ERROR;
3249                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3250                 goto f_err;
3251                 }
3252         for (nc=0; nc<llen; )
3253                 {
3254                 n2l3(p,l);
3255                 if ((l+nc+3) > llen)
3256                         {
3257                         al=SSL_AD_DECODE_ERROR;
3258                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3259                         goto f_err;
3260                         }
3261
3262                 q=p;
3263                 x=d2i_X509(NULL,&p,l);
3264                 if (x == NULL)
3265                         {
3266                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3267                         goto err;
3268                         }
3269                 if (p != (q+l))
3270                         {
3271                         al=SSL_AD_DECODE_ERROR;
3272                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3273                         goto f_err;
3274                         }
3275                 if (!sk_X509_push(sk,x))
3276                         {
3277                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3278                         goto err;
3279                         }
3280                 x=NULL;
3281                 nc+=l+3;
3282                 }
3283
3284         if (sk_X509_num(sk) <= 0)
3285                 {
3286                 /* TLS does not mind 0 certs returned */
3287                 if (s->version == SSL3_VERSION)
3288                         {
3289                         al=SSL_AD_HANDSHAKE_FAILURE;
3290                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3291                         goto f_err;
3292                         }
3293                 /* Fail for TLS only if we required a certificate */
3294                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3295                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3296                         {
3297                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3298                         al=SSL_AD_HANDSHAKE_FAILURE;
3299                         goto f_err;
3300                         }
3301                 /* No client certificate so digest cached records */
3302                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3303                         {
3304                         al=SSL_AD_INTERNAL_ERROR;
3305                         goto f_err;
3306                         }
3307                 }
3308         else
3309                 {
3310                 i=ssl_verify_cert_chain(s,sk);
3311                 if (i <= 0)
3312                         {
3313                         al=ssl_verify_alarm_type(s->verify_result);
3314                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3315                         goto f_err;
3316                         }
3317                 }
3318
3319         if (s->session->peer != NULL) /* This should not be needed */
3320                 X509_free(s->session->peer);
3321         s->session->peer=sk_X509_shift(sk);
3322         s->session->verify_result = s->verify_result;
3323
3324         /* With the current implementation, sess_cert will always be NULL
3325          * when we arrive here. */
3326         if (s->session->sess_cert == NULL)
3327                 {
3328                 s->session->sess_cert = ssl_sess_cert_new();
3329                 if (s->session->sess_cert == NULL)
3330                         {
3331                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3332                         goto err;
3333                         }
3334                 }
3335         if (s->session->sess_cert->cert_chain != NULL)
3336                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3337         s->session->sess_cert->cert_chain=sk;
3338         /* Inconsistency alert: cert_chain does *not* include the
3339          * peer's own certificate, while we do include it in s3_clnt.c */
3340
3341         sk=NULL;
3342
3343         ret=1;
3344         if (0)
3345                 {
3346 f_err:
3347                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3348                 }
3349 err:
3350         if (x != NULL) X509_free(x);
3351         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3352         return(ret);
3353         }
3354
3355 int ssl3_send_server_certificate(SSL *s)
3356         {
3357         CERT_PKEY *cpk;
3358
3359         if (s->state == SSL3_ST_SW_CERT_A)
3360                 {
3361                 cpk=ssl_get_server_send_pkey(s);
3362                 if (cpk == NULL)
3363                         {
3364                         /* VRS: allow null cert if auth == KRB5 */
3365                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3366                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3367                                 {
3368                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3369                                 return(0);
3370                                 }
3371                         }
3372
3373                 ssl3_output_cert_chain(s,cpk);
3374                 s->state=SSL3_ST_SW_CERT_B;
3375                 }
3376
3377         /* SSL3_ST_SW_CERT_B */
3378         return ssl_do_write(s);
3379         }
3380
3381 #ifndef OPENSSL_NO_TLSEXT
3382 /* send a new session ticket (not necessarily for a new session) */
3383 int ssl3_send_newsession_ticket(SSL *s)
3384         {
3385         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3386                 {
3387                 unsigned char *p, *senc, *macstart;
3388                 const unsigned char *const_p;
3389                 int len, slen_full, slen;
3390                 SSL_SESSION *sess;
3391                 unsigned int hlen;
3392                 EVP_CIPHER_CTX ctx;
3393                 HMAC_CTX hctx;
3394                 SSL_CTX *tctx = s->initial_ctx;
3395                 unsigned char iv[EVP_MAX_IV_LENGTH];
3396                 unsigned char key_name[16];
3397
3398                 /* get session encoding length */
3399                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3400                 /* Some length values are 16 bits, so forget it if session is
3401                  * too long
3402                  */
3403                 if (slen_full > 0xFF00)
3404                         return -1;
3405                 senc = OPENSSL_malloc(slen_full);
3406                 if (!senc)
3407                         return -1;
3408                 p = senc;
3409                 i2d_SSL_SESSION(s->session, &p);
3410
3411                 /* create a fresh copy (not shared with other threads) to clean up */
3412                 const_p = senc;
3413                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3414                 if (sess == NULL)
3415                         {
3416                         OPENSSL_free(senc);
3417                         return -1;
3418                         }
3419                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3420
3421                 slen = i2d_SSL_SESSION(sess, NULL);
3422                 if (slen > slen_full) /* shouldn't ever happen */
3423                         {
3424                         OPENSSL_free(senc);
3425                         return -1;
3426                         }
3427                 p = senc;
3428                 i2d_SSL_SESSION(sess, &p);
3429                 SSL_SESSION_free(sess);
3430
3431                 /* Grow buffer if need be: the length calculation is as
3432                  * follows handshake_header_length +
3433                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3434                  * 16 (key name) + max_iv_len (iv length) +
3435                  * session_length + max_enc_block_size (max encrypted session
3436                  * length) + max_md_size (HMAC).
3437                  */
3438                 if (!BUF_MEM_grow(s->init_buf,
3439                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3440                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3441                         return -1;
3442                 p = ssl_handshake_start(s);
3443                 EVP_CIPHER_CTX_init(&ctx);
3444                 HMAC_CTX_init(&hctx);
3445                 /* Initialize HMAC and cipher contexts. If callback present
3446                  * it does all the work otherwise use generated values
3447                  * from parent ctx.
3448                  */
3449                 if (tctx->tlsext_ticket_key_cb)
3450                         {
3451                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3452                                                          &hctx, 1) < 0)
3453                                 {
3454                                 OPENSSL_free(senc);
3455                                 return -1;
3456                                 }
3457                         }
3458                 else
3459                         {
3460                         RAND_pseudo_bytes(iv, 16);
3461                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3462                                         tctx->tlsext_tick_aes_key, iv);
3463                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3464                                         tlsext_tick_md(), NULL);
3465                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3466                         }
3467
3468                 /* Ticket lifetime hint (advisory only):
3469                  * We leave this unspecified for resumed session (for simplicity),
3470                  * and guess that tickets for new sessions will live as long
3471                  * as their sessions. */
3472                 l2n(s->hit ? 0 : s->session->timeout, p);
3473
3474                 /* Skip ticket length for now */
3475                 p += 2;
3476                 /* Output key name */
3477                 macstart = p;
3478                 memcpy(p, key_name, 16);
3479                 p += 16;
3480                 /* output IV */
3481                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3482                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3483                 /* Encrypt session data */
3484                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3485                 p += len;
3486                 EVP_EncryptFinal(&ctx, p, &len);
3487                 p += len;
3488                 EVP_CIPHER_CTX_cleanup(&ctx);
3489
3490                 HMAC_Update(&hctx, macstart, p - macstart);
3491                 HMAC_Final(&hctx, p, &hlen);
3492                 HMAC_CTX_cleanup(&hctx);
3493
3494                 p += hlen;
3495                 /* Now write out lengths: p points to end of data written */
3496                 /* Total length */
3497                 len = p - ssl_handshake_start(s);
3498                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3499                 /* Skip ticket lifetime hint */
3500                 p = ssl_handshake_start(s) + 4;
3501                 s2n(len - 6, p);
3502                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3503                 OPENSSL_free(senc);
3504                 }
3505
3506         /* SSL3_ST_SW_SESSION_TICKET_B */
3507         return ssl_do_write(s);
3508         }
3509
3510 int ssl3_send_cert_status(SSL *s)
3511         {
3512         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3513                 {
3514                 unsigned char *p;
3515                 /* Grow buffer if need be: the length calculation is as
3516                  * follows 1 (message type) + 3 (message length) +
3517                  * 1 (ocsp response type) + 3 (ocsp response length)
3518                  * + (ocsp response)
3519                  */
3520                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3521                         return -1;
3522
3523                 p=(unsigned char *)s->init_buf->data;
3524
3525                 /* do the header */
3526                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3527                 /* message length */
3528                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3529                 /* status type */
3530                 *(p++)= s->tlsext_status_type;
3531                 /* length of OCSP response */
3532                 l2n3(s->tlsext_ocsp_resplen, p);
3533                 /* actual response */
3534                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3535                 /* number of bytes to write */
3536                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3537                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3538                 s->init_off = 0;
3539                 }
3540
3541         /* SSL3_ST_SW_CERT_STATUS_B */
3542         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3543         }
3544
3545 # ifndef OPENSSL_NO_NEXTPROTONEG
3546 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3547  * sets the next_proto member in s if found */
3548 int ssl3_get_next_proto(SSL *s)
3549         {
3550         int ok;
3551         int proto_len, padding_len;
3552         long n;
3553         const unsigned char *p;
3554
3555         /* Clients cannot send a NextProtocol message if we didn't see the
3556          * extension in their ClientHello */
3557         if (!s->s3->next_proto_neg_seen)
3558                 {
3559                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3560                 return -1;
3561                 }
3562
3563         n=s->method->ssl_get_message(s,
3564                 SSL3_ST_SR_NEXT_PROTO_A,
3565                 SSL3_ST_SR_NEXT_PROTO_B,
3566                 SSL3_MT_NEXT_PROTO,
3567                 514,  /* See the payload format below */
3568                 &ok);
3569
3570         if (!ok)
3571                 return((int)n);
3572
3573         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3574          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3575          * by ssl3_get_finished). */
3576         if (!s->s3->change_cipher_spec)
3577                 {
3578                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3579                 return -1;
3580                 }
3581
3582         if (n < 2)
3583                 return 0;  /* The body must be > 1 bytes long */
3584
3585         p=(unsigned char *)s->init_msg;
3586
3587         /* The payload looks like:
3588          *   uint8 proto_len;
3589          *   uint8 proto[proto_len];
3590          *   uint8 padding_len;
3591          *   uint8 padding[padding_len];
3592          */
3593         proto_len = p[0];
3594         if (proto_len + 2 > s->init_num)
3595                 return 0;
3596         padding_len = p[proto_len + 1];
3597         if (proto_len + padding_len + 2 != s->init_num)
3598                 return 0;
3599
3600         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3601         if (!s->next_proto_negotiated)
3602                 {
3603                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3604                 return 0;
3605                 }
3606         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3607         s->next_proto_negotiated_len = proto_len;
3608
3609         return 1;
3610         }
3611 # endif
3612
3613 int tls1_send_server_supplemental_data(SSL *s)
3614         {
3615         size_t length = 0;
3616         const unsigned char *authz, *orig_authz;
3617         unsigned char *p;
3618         size_t authz_length, i;
3619
3620         if (s->state != SSL3_ST_SW_SUPPLEMENTAL_DATA_A)
3621                 return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3622
3623         orig_authz = authz = ssl_get_authz_data(s, &authz_length);
3624         if (authz == NULL)
3625                 {
3626                 /* This should never occur. */
3627                 return 0;
3628                 }
3629
3630         /* First we walk over the authz data to see how long the handshake
3631          * message will be. */
3632         for (i = 0; i < authz_length; i++)
3633                 {
3634                 unsigned short len;
3635                 unsigned char type;
3636
3637                 type = *(authz++);
3638                 n2s(authz, len);
3639                 /* n2s increments authz by 2*/
3640                 i += 2;
3641
3642                 if (memchr(s->s3->tlsext_authz_client_types,
3643                            type,
3644                            s->s3->tlsext_authz_client_types_len) != NULL)
3645                         length += 1 /* authz type */ + 2 /* length */ + len;
3646
3647                 authz += len;
3648                 i += len;
3649                 }
3650
3651         length += 1 /* handshake type */ +
3652                   3 /* handshake length */ +
3653                   3 /* supplemental data length */ +
3654                   2 /* supplemental entry type */ +
3655                   2 /* supplemental entry length */;
3656
3657         if (!BUF_MEM_grow_clean(s->init_buf, length))
3658                 {
3659                 SSLerr(SSL_F_TLS1_SEND_SERVER_SUPPLEMENTAL_DATA,ERR_R_BUF_LIB);
3660                 return 0;
3661                 }
3662
3663         p = (unsigned char *)s->init_buf->data;
3664         *(p++) = SSL3_MT_SUPPLEMENTAL_DATA;
3665         /* Handshake length */
3666         l2n3(length - 4, p);
3667         /* Length of supplemental data */
3668         l2n3(length - 7, p);
3669         /* Supplemental data type */
3670         s2n(TLSEXT_SUPPLEMENTALDATATYPE_authz_data, p);
3671         /* Its length */
3672         s2n(length - 11, p);
3673
3674         authz = orig_authz;
3675
3676         /* Walk over the authz again and append the selected elements. */
3677         for (i = 0; i < authz_length; i++)
3678                 {
3679                 unsigned short len;
3680                 unsigned char type;
3681
3682                 type = *(authz++);
3683                 n2s(authz, len);
3684                 /* n2s increments authz by 2 */
3685                 i += 2;
3686
3687                 if (memchr(s->s3->tlsext_authz_client_types,
3688                            type,
3689                            s->s3->tlsext_authz_client_types_len) != NULL)
3690                         {
3691                         *(p++) = type;
3692                         s2n(len, p);
3693                         memcpy(p, authz, len);
3694                         p += len;
3695                         }
3696
3697                 authz += len;
3698                 i += len;
3699                 }
3700
3701         s->state = SSL3_ST_SW_SUPPLEMENTAL_DATA_B;
3702         s->init_num = length;
3703         s->init_off = 0;
3704
3705         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3706         }
3707 #endif