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 "../crypto/constant_time_locl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 #ifndef OPENSSL_NO_SSL3_METHOD
 174 static const SSL_METHOD *ssl3_get_server_method(int ver);
 175
 176 static const SSL_METHOD *ssl3_get_server_method(int ver)
 177         {
 178         if (ver == SSL3_VERSION)
 179                 return(SSLv3_server_method());
 180         else
 181                 return(NULL);
 182         }
 183
 184 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 185                         ssl3_accept,
 186                         ssl_undefined_function,
 187                         ssl3_get_server_method)
 188 #endif
 189
 190 #ifndef OPENSSL_NO_SRP
 191 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 192         {
 193         int ret = SSL_ERROR_NONE;
 194
 195         *al = SSL_AD_UNRECOGNIZED_NAME;
 196
 197         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 198             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 199                 {
 200                 if(s->srp_ctx.login == NULL)
 201                         {
 202                         /* RFC 5054 says SHOULD reject,
 203                            we do so if There is no srp login name */
 204                         ret = SSL3_AL_FATAL;
 205                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 206                         }
 207                 else
 208                         {
 209                         ret = SSL_srp_server_param_with_username(s,al);
 210                         }
 211                 }
 212         return ret;
 213         }
 214 #endif
 215
 216 int ssl3_accept(SSL *s)
 217         {
 218         BUF_MEM *buf;
 219         unsigned long alg_k,Time=(unsigned long)time(NULL);
 220         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 221         int ret= -1;
 222         int new_state,state,skip=0;
 223
 224         RAND_add(&Time,sizeof(Time),0);
 225         ERR_clear_error();
 226         clear_sys_error();
 227
 228         if (s->info_callback != NULL)
 229                 cb=s->info_callback;
 230         else if (s->ctx->info_callback != NULL)
 231                 cb=s->ctx->info_callback;
 232
 233         /* init things to blank */
 234         s->in_handshake++;
 235         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 236
 237         if (s->cert == NULL)
 238                 {
 239                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 240                 return(-1);
 241                 }
 242
 243 #ifndef OPENSSL_NO_HEARTBEATS
 244         /* If we're awaiting a HeartbeatResponse, pretend we
 245          * already got and don't await it anymore, because
 246          * Heartbeats don't make sense during handshakes anyway.
 247          */
 248         if (s->tlsext_hb_pending)
 249                 {
 250                 s->tlsext_hb_pending = 0;
 251                 s->tlsext_hb_seq++;
 252                 }
 253 #endif
 254
 255         for (;;)
 256                 {
 257                 state=s->state;
 258
 259                 switch (s->state)
 260                         {
 261                 case SSL_ST_RENEGOTIATE:
 262                         s->renegotiate=1;
 263                         /* s->state=SSL_ST_ACCEPT; */
 264
 265                 case SSL_ST_BEFORE:
 266                 case SSL_ST_ACCEPT:
 267                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 268                 case SSL_ST_OK|SSL_ST_ACCEPT:
 269
 270                         s->server=1;
 271                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 272
 273                         if ((s->version>>8) != 3)
 274                                 {
 275                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 276                                 return -1;
 277                                 }
 278                         s->type=SSL_ST_ACCEPT;
 279
 280                         if (s->init_buf == NULL)
 281                                 {
 282                                 if ((buf=BUF_MEM_new()) == NULL)
 283                                         {
 284                                         ret= -1;
 285                                         goto end;
 286                                         }
 287                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 288                                         {
 289                                         BUF_MEM_free(buf);
 290                                         ret= -1;
 291                                         goto end;
 292                                         }
 293                                 s->init_buf=buf;
 294                                 }
 295
 296                         if (!ssl3_setup_buffers(s))
 297                                 {
 298                                 ret= -1;
 299                                 goto end;
 300                                 }
 301
 302                         s->init_num=0;
 303                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 304                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 305                         /* Should have been reset by ssl3_get_finished, too. */
 306                         s->s3->change_cipher_spec = 0;
 307
 308                         if (s->state != SSL_ST_RENEGOTIATE)
 309                                 {
 310                                 /* Ok, we now need to push on a buffering BIO so that
 311                                  * the output is sent in a way that TCP likes :-)
 312                                  */
 313                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 314
 315                                 ssl3_init_finished_mac(s);
 316                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 317                                 s->ctx->stats.sess_accept++;
 318                                 }
 319                         else if (!s->s3->send_connection_binding &&
 320                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 321                                 {
 322                                 /* Server attempting to renegotiate with
 323                                  * client that doesn't support secure
 324                                  * renegotiation.
 325                                  */
 326                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 327                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 328                                 ret = -1;
 329                                 goto end;
 330                                 }
 331                         else
 332                                 {
 333                                 /* s->state == SSL_ST_RENEGOTIATE,
 334                                  * we will just send a HelloRequest */
 335                                 s->ctx->stats.sess_accept_renegotiate++;
 336                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 337                                 }
 338                         break;
 339
 340                 case SSL3_ST_SW_HELLO_REQ_A:
 341                 case SSL3_ST_SW_HELLO_REQ_B:
 342
 343                         s->shutdown=0;
 344                         ret=ssl3_send_hello_request(s);
 345                         if (ret <= 0) goto end;
 346                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 347                         s->state=SSL3_ST_SW_FLUSH;
 348                         s->init_num=0;
 349
 350                         ssl3_init_finished_mac(s);
 351                         break;
 352
 353                 case SSL3_ST_SW_HELLO_REQ_C:
 354                         s->state=SSL_ST_OK;
 355                         break;
 356
 357                 case SSL3_ST_SR_CLNT_HELLO_A:
 358                 case SSL3_ST_SR_CLNT_HELLO_B:
 359                 case SSL3_ST_SR_CLNT_HELLO_C:
 360
 361                         s->shutdown=0;
 362                         if (s->rwstate != SSL_X509_LOOKUP)
 363                         {
 364                                 ret=ssl3_get_client_hello(s);
 365                                 if (ret <= 0) goto end;
 366                         }
 367 #ifndef OPENSSL_NO_SRP
 368                         {
 369                         int al;
 370                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 371                                         {
 372                                         /* callback indicates firther work to be done */
 373                                         s->rwstate=SSL_X509_LOOKUP;
 374                                         goto end;
 375                                         }
 376                         if (ret != SSL_ERROR_NONE)
 377                                 {
 378                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 379                                 /* This is not really an error but the only means to
 380                                    for a client to detect whether srp is supported. */
 381                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 382                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 383                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 384                                 ret= -1;
 385                                 goto end;
 386                                 }
 387                         }
 388 #endif
 389
 390                         s->renegotiate = 2;
 391                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 392                         s->init_num=0;
 393                         break;
 394
 395                 case SSL3_ST_SW_SRVR_HELLO_A:
 396                 case SSL3_ST_SW_SRVR_HELLO_B:
 397                         ret=ssl3_send_server_hello(s);
 398                         if (ret <= 0) goto end;
 399 #ifndef OPENSSL_NO_TLSEXT
 400                         if (s->hit)
 401                                 {
 402                                 if (s->tlsext_ticket_expected)
 403                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 404                                 else
 405                                         s->state=SSL3_ST_SW_CHANGE_A;
 406                                 }
 407 #else
 408                         if (s->hit)
 409                                         s->state=SSL3_ST_SW_CHANGE_A;
 410 #endif
 411                         else
 412                                 s->state=SSL3_ST_SW_CERT_A;
 413                         s->init_num=0;
 414                         break;
 415
 416                 case SSL3_ST_SW_CERT_A:
 417                 case SSL3_ST_SW_CERT_B:
 418                         /* Check if it is anon DH or anon ECDH, */
 419                         /* normal PSK or KRB5 or SRP */
 420                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
 421                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 422                                 {
 423                                 ret=ssl3_send_server_certificate(s);
 424                                 if (ret <= 0) goto end;
 425 #ifndef OPENSSL_NO_TLSEXT
 426                                 if (s->tlsext_status_expected)
 427                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 428                                 else
 429                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 430                                 }
 431                         else
 432                                 {
 433                                 skip = 1;
 434                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 435                                 }
 436 #else
 437                                 }
 438                         else
 439                                 skip=1;
 440
 441                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 442 #endif
 443                         s->init_num=0;
 444                         break;
 445
 446                 case SSL3_ST_SW_KEY_EXCH_A:
 447                 case SSL3_ST_SW_KEY_EXCH_B:
 448                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 449
 450                         /* clear this, it may get reset by
 451                          * send_server_key_exchange */
 452                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 453 #ifndef OPENSSL_NO_KRB5
 454                                 && !(alg_k & SSL_kKRB5)
 455 #endif /* OPENSSL_NO_KRB5 */
 456                                 )
 457                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 458                                  * even when forbidden by protocol specs
 459                                  * (handshake may fail as clients are not required to
 460                                  * be able to handle this) */
 461                                 s->s3->tmp.use_rsa_tmp=1;
 462                         else
 463                                 s->s3->tmp.use_rsa_tmp=0;
 464
 465
 466                         /* only send if a DH key exchange, fortezza or
 467                          * RSA but we have a sign only certificate
 468                          *
 469                          * PSK: may send PSK identity hints
 470                          *
 471                          * For ECC ciphersuites, we send a serverKeyExchange
 472                          * message only if the cipher suite is either
 473                          * ECDH-anon or ECDHE. In other cases, the
 474                          * server certificate contains the server's
 475                          * public key for key exchange.
 476                          */
 477                         if (s->s3->tmp.use_rsa_tmp
 478                         /* PSK: send ServerKeyExchange if PSK identity
 479                          * hint if provided */
 480 #ifndef OPENSSL_NO_PSK
 481                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 482 #endif
 483 #ifndef OPENSSL_NO_SRP
 484                             /* SRP: send ServerKeyExchange */
 485                             || (alg_k & SSL_kSRP)
 486 #endif
 487                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 488                             || (alg_k & SSL_kEECDH)
 489                             || ((alg_k & SSL_kRSA)
 490                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 491                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 492                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 493                                         )
 494                                     )
 495                                 )
 496                             )
 497                                 {
 498                                 ret=ssl3_send_server_key_exchange(s);
 499                                 if (ret <= 0) goto end;
 500                                 }
 501                         else
 502                                 skip=1;
 503
 504                         s->state=SSL3_ST_SW_CERT_REQ_A;
 505                         s->init_num=0;
 506                         break;
 507
 508                 case SSL3_ST_SW_CERT_REQ_A:
 509                 case SSL3_ST_SW_CERT_REQ_B:
 510                         if (/* don't request cert unless asked for it: */
 511                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 512                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 513                                  * don't request cert during re-negotiation: */
 514                                 ((s->session->peer != NULL) &&
 515                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 516                                 /* never request cert in anonymous ciphersuites
 517                                  * (see section "Certificate request" in SSL 3 drafts
 518                                  * and in RFC 2246): */
 519                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 520                                  /* ... except when the application insists on verification
 521                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 522                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 523                                  /* never request cert in Kerberos ciphersuites */
 524                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 525                                 /* don't request certificate for SRP auth */
 526                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 527                                 /* With normal PSK Certificates and
 528                                  * Certificate Requests are omitted */
 529                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 530                                 {
 531                                 /* no cert request */
 532                                 skip=1;
 533                                 s->s3->tmp.cert_request=0;
 534                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 535                                 if (s->s3->handshake_buffer)
 536                                         if (!ssl3_digest_cached_records(s))
 537                                                 return -1;
 538                                 }
 539                         else
 540                                 {
 541                                 s->s3->tmp.cert_request=1;
 542                                 ret=ssl3_send_certificate_request(s);
 543                                 if (ret <= 0) goto end;
 544 #ifndef NETSCAPE_HANG_BUG
 545                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 546 #else
 547                                 s->state=SSL3_ST_SW_FLUSH;
 548                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 549 #endif
 550                                 s->init_num=0;
 551                                 }
 552                         break;
 553
 554                 case SSL3_ST_SW_SRVR_DONE_A:
 555                 case SSL3_ST_SW_SRVR_DONE_B:
 556                         ret=ssl3_send_server_done(s);
 557                         if (ret <= 0) goto end;
 558                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 559                         s->state=SSL3_ST_SW_FLUSH;
 560                         s->init_num=0;
 561                         break;
 562
 563                 case SSL3_ST_SW_FLUSH:
 564
 565                         /* This code originally checked to see if
 566                          * any data was pending using BIO_CTRL_INFO
 567                          * and then flushed. This caused problems
 568                          * as documented in PR#1939. The proposed
 569                          * fix doesn't completely resolve this issue
 570                          * as buggy implementations of BIO_CTRL_PENDING
 571                          * still exist. So instead we just flush
 572                          * unconditionally.
 573                          */
 574
 575                         s->rwstate=SSL_WRITING;
 576                         if (BIO_flush(s->wbio) <= 0)
 577                                 {
 578                                 ret= -1;
 579                                 goto end;
 580                                 }
 581                         s->rwstate=SSL_NOTHING;
 582
 583                         s->state=s->s3->tmp.next_state;
 584                         break;
 585
 586                 case SSL3_ST_SR_CERT_A:
 587                 case SSL3_ST_SR_CERT_B:
 588                         /* Check for second client hello (MS SGC) */
 589                         ret = ssl3_check_client_hello(s);
 590                         if (ret <= 0)
 591                                 goto end;
 592                         if (ret == 2)
 593                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 594                         else {
 595                                 if (s->s3->tmp.cert_request)
 596                                         {
 597                                         ret=ssl3_get_client_certificate(s);
 598                                         if (ret <= 0) goto end;
 599                                         }
 600                                 s->init_num=0;
 601                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 602                         }
 603                         break;
 604
 605                 case SSL3_ST_SR_KEY_EXCH_A:
 606                 case SSL3_ST_SR_KEY_EXCH_B:
 607                         ret=ssl3_get_client_key_exchange(s);
 608                         if (ret <= 0)
 609                                 goto end;
 610                         if (ret == 2)
 611                                 {
 612                                 /* For the ECDH ciphersuites when
 613                                  * the client sends its ECDH pub key in
 614                                  * a certificate, the CertificateVerify
 615                                  * message is not sent.
 616                                  * Also for GOST ciphersuites when
 617                                  * the client uses its key from the certificate
 618                                  * for key exchange.
 619                                  */
 620 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 621                                 s->state=SSL3_ST_SR_FINISHED_A;
 622 #else
 623                                 if (s->s3->next_proto_neg_seen)
 624                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 625                                 else
 626                                         s->state=SSL3_ST_SR_FINISHED_A;
 627 #endif
 628                                 s->init_num = 0;
 629                                 }
 630                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 631                                 {
 632                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 633                                 s->init_num=0;
 634                                 if (!s->session->peer)
 635                                         break;
 636                                 /* For TLS v1.2 freeze the handshake buffer
 637                                  * at this point and digest cached records.
 638                                  */
 639                                 if (!s->s3->handshake_buffer)
 640                                         {
 641                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 642                                         return -1;
 643                                         }
 644                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 645                                 if (!ssl3_digest_cached_records(s))
 646                                         return -1;
 647                                 }
 648                         else
 649                                 {
 650                                 int offset=0;
 651                                 int dgst_num;
 652
 653                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 654                                 s->init_num=0;
 655
 656                                 /* We need to get hashes here so if there is
 657                                  * a client cert, it can be verified
 658                                  * FIXME - digest processing for CertificateVerify
 659                                  * should be generalized. But it is next step
 660                                  */
 661                                 if (s->s3->handshake_buffer)
 662                                         if (!ssl3_digest_cached_records(s))
 663                                                 return -1;
 664                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 665                                         if (s->s3->handshake_dgst[dgst_num])
 666                                                 {
 667                                                 int dgst_size;
 668
 669                                                 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]));
 670                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 671                                                 if (dgst_size < 0)
 672                                                         {
 673                                                         ret = -1;
 674                                                         goto end;
 675                                                         }
 676                                                 offset+=dgst_size;
 677                                                 }
 678                                 }
 679                         break;
 680
 681                 case SSL3_ST_SR_CERT_VRFY_A:
 682                 case SSL3_ST_SR_CERT_VRFY_B:
 683                         /*
 684                          * This *should* be the first time we enable CCS, but be
 685                          * extra careful about surrounding code changes. We need
 686                          * to set this here because we don't know if we're
 687                          * expecting a CertificateVerify or not.
 688                          */
 689                         if (!s->s3->change_cipher_spec)
 690                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 691                         /* we should decide if we expected this one */
 692                         ret=ssl3_get_cert_verify(s);
 693                         if (ret <= 0) goto end;
 694
 695 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 696                         s->state=SSL3_ST_SR_FINISHED_A;
 697 #else
 698                         if (s->s3->next_proto_neg_seen)
 699                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 700                         else
 701                                 s->state=SSL3_ST_SR_FINISHED_A;
 702 #endif
 703                         s->init_num=0;
 704                         break;
 705
 706 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 707                 case SSL3_ST_SR_NEXT_PROTO_A:
 708                 case SSL3_ST_SR_NEXT_PROTO_B:
 709                         /*
 710                          * Enable CCS for resumed handshakes with NPN.
 711                          * In a full handshake with NPN, we end up here through
 712                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 713                          * already set. Receiving a CCS clears the flag, so make
 714                          * sure not to re-enable it to ban duplicates.
 715                          * s->s3->change_cipher_spec is set when a CCS is
 716                          * processed in s3_pkt.c, and remains set until
 717                          * the client's Finished message is read.
 718                          */
 719                         if (!s->s3->change_cipher_spec)
 720                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 721
 722                         ret=ssl3_get_next_proto(s);
 723                         if (ret <= 0) goto end;
 724                         s->init_num = 0;
 725                         s->state=SSL3_ST_SR_FINISHED_A;
 726                         break;
 727 #endif
 728
 729                 case SSL3_ST_SR_FINISHED_A:
 730                 case SSL3_ST_SR_FINISHED_B:
 731                         /*
 732                          * Enable CCS for resumed handshakes without NPN.
 733                          * In a full handshake, we end up here through
 734                          * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
 735                          * already set. Receiving a CCS clears the flag, so make
 736                          * sure not to re-enable it to ban duplicates.
 737                          * s->s3->change_cipher_spec is set when a CCS is
 738                          * processed in s3_pkt.c, and remains set until
 739                          * the client's Finished message is read.
 740                          */
 741                         if (!s->s3->change_cipher_spec)
 742                                 s->s3->flags |= SSL3_FLAGS_CCS_OK;
 743                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 744                                 SSL3_ST_SR_FINISHED_B);
 745                         if (ret <= 0) goto end;
 746                         if (s->hit)
 747                                 s->state=SSL_ST_OK;
 748 #ifndef OPENSSL_NO_TLSEXT
 749                         else if (s->tlsext_ticket_expected)
 750                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 751 #endif
 752                         else
 753                                 s->state=SSL3_ST_SW_CHANGE_A;
 754                         s->init_num=0;
 755                         break;
 756
 757 #ifndef OPENSSL_NO_TLSEXT
 758                 case SSL3_ST_SW_SESSION_TICKET_A:
 759                 case SSL3_ST_SW_SESSION_TICKET_B:
 760                         ret=ssl3_send_newsession_ticket(s);
 761                         if (ret <= 0) goto end;
 762                         s->state=SSL3_ST_SW_CHANGE_A;
 763                         s->init_num=0;
 764                         break;
 765
 766                 case SSL3_ST_SW_CERT_STATUS_A:
 767                 case SSL3_ST_SW_CERT_STATUS_B:
 768                         ret=ssl3_send_cert_status(s);
 769                         if (ret <= 0) goto end;
 770                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 771                         s->init_num=0;
 772                         break;
 773
 774 #endif
 775
 776                 case SSL3_ST_SW_CHANGE_A:
 777                 case SSL3_ST_SW_CHANGE_B:
 778
 779                         s->session->cipher=s->s3->tmp.new_cipher;
 780                         if (!s->method->ssl3_enc->setup_key_block(s))
 781                                 { ret= -1; goto end; }
 782
 783                         ret=ssl3_send_change_cipher_spec(s,
 784                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 785
 786                         if (ret <= 0) goto end;
 787                         s->state=SSL3_ST_SW_FINISHED_A;
 788                         s->init_num=0;
 789
 790                         if (!s->method->ssl3_enc->change_cipher_state(s,
 791                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 792                                 {
 793                                 ret= -1;
 794                                 goto end;
 795                                 }
 796
 797                         break;
 798
 799                 case SSL3_ST_SW_FINISHED_A:
 800                 case SSL3_ST_SW_FINISHED_B:
 801                         ret=ssl3_send_finished(s,
 802                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 803                                 s->method->ssl3_enc->server_finished_label,
 804                                 s->method->ssl3_enc->server_finished_label_len);
 805                         if (ret <= 0) goto end;
 806                         s->state=SSL3_ST_SW_FLUSH;
 807                         if (s->hit)
 808                                 {
 809 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 810                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 811 #else
 812                                 if (s->s3->next_proto_neg_seen)
 813                                         {
 814                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 815                                         }
 816                                 else
 817                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 818 #endif
 819                                 }
 820                         else
 821                                 s->s3->tmp.next_state=SSL_ST_OK;
 822                         s->init_num=0;
 823                         break;
 824
 825                 case SSL_ST_OK:
 826                         /* clean a few things up */
 827                         ssl3_cleanup_key_block(s);
 828
 829                         BUF_MEM_free(s->init_buf);
 830                         s->init_buf=NULL;
 831
 832                         /* remove buffering on output */
 833                         ssl_free_wbio_buffer(s);
 834
 835                         s->init_num=0;
 836
 837                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 838                                 {
 839                                 s->renegotiate=0;
 840                                 s->new_session=0;
 841
 842                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 843
 844                                 s->ctx->stats.sess_accept_good++;
 845                                 /* s->server=1; */
 846                                 s->handshake_func=ssl3_accept;
 847
 848                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 849                                 }
 850
 851                         ret = 1;
 852                         goto end;
 853                         /* break; */
 854
 855                 default:
 856                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 857                         ret= -1;
 858                         goto end;
 859                         /* break; */
 860                         }
 861
 862                 if (!s->s3->tmp.reuse_message && !skip)
 863                         {
 864                         if (s->debug)
 865                                 {
 866                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 867                                         goto end;
 868                                 }
 869
 870
 871                         if ((cb != NULL) && (s->state != state))
 872                                 {
 873                                 new_state=s->state;
 874                                 s->state=state;
 875                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 876                                 s->state=new_state;
 877                                 }
 878                         }
 879                 skip=0;
 880                 }
 881 end:
 882         /* BIO_flush(s->wbio); */
 883
 884         s->in_handshake--;
 885         if (cb != NULL)
 886                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 887         return(ret);
 888         }
 889
 890 int ssl3_send_hello_request(SSL *s)
 891         {
 892         unsigned char *p;
 893
 894         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 895                 {
 896                 p=(unsigned char *)s->init_buf->data;
 897                 *(p++)=SSL3_MT_HELLO_REQUEST;
 898                 *(p++)=0;
 899                 *(p++)=0;
 900                 *(p++)=0;
 901
 902                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 903                 /* number of bytes to write */
 904                 s->init_num=4;
 905                 s->init_off=0;
 906                 }
 907
 908         /* SSL3_ST_SW_HELLO_REQ_B */
 909         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 910         }
 911
 912 int ssl3_check_client_hello(SSL *s)
 913         {
 914         int ok;
 915         long n;
 916
 917         /* this function is called when we really expect a Certificate message,
 918          * so permit appropriate message length */
 919         n=s->method->ssl_get_message(s,
 920                 SSL3_ST_SR_CERT_A,
 921                 SSL3_ST_SR_CERT_B,
 922                 -1,
 923                 s->max_cert_list,
 924                 &ok);
 925         if (!ok) return((int)n);
 926         s->s3->tmp.reuse_message = 1;
 927         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 928                 {
 929                 /* We only allow the client to restart the handshake once per
 930                  * negotiation. */
 931                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 932                         {
 933                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 934                         return -1;
 935                         }
 936                 /* Throw away what we have done so far in the current handshake,
 937                  * which will now be aborted. (A full SSL_clear would be too much.) */
 938 #ifndef OPENSSL_NO_DH
 939                 if (s->s3->tmp.dh != NULL)
 940                         {
 941                         DH_free(s->s3->tmp.dh);
 942                         s->s3->tmp.dh = NULL;
 943                         }
 944 #endif
 945 #ifndef OPENSSL_NO_ECDH
 946                 if (s->s3->tmp.ecdh != NULL)
 947                         {
 948                         EC_KEY_free(s->s3->tmp.ecdh);
 949                         s->s3->tmp.ecdh = NULL;
 950                         }
 951 #endif
 952                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 953                 return 2;
 954                 }
 955         return 1;
 956 }
 957
 958 int ssl3_get_client_hello(SSL *s)
 959         {
 960         int i,j,ok,al,ret= -1;
 961         unsigned int cookie_len;
 962         long n;
 963         unsigned long id;
 964         unsigned char *p,*d,*q;
 965         SSL_CIPHER *c;
 966 #ifndef OPENSSL_NO_COMP
 967         SSL_COMP *comp=NULL;
 968 #endif
 969         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 970
 971         /* We do this so that we will respond with our native type.
 972          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 973          * This down switching should be handled by a different method.
 974          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 975          * TLSv1.
 976          */
 977         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 978                 )
 979                 {
 980                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 981                 }
 982         s->first_packet=1;
 983         n=s->method->ssl_get_message(s,
 984                 SSL3_ST_SR_CLNT_HELLO_B,
 985                 SSL3_ST_SR_CLNT_HELLO_C,
 986                 SSL3_MT_CLIENT_HELLO,
 987                 SSL3_RT_MAX_PLAIN_LENGTH,
 988                 &ok);
 989
 990         if (!ok) return((int)n);
 991         s->first_packet=0;
 992         d=p=(unsigned char *)s->init_msg;
 993
 994         /* use version from inside client hello, not from record header
 995          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 996         s->client_version=(((int)p[0])<<8)|(int)p[1];
 997         p+=2;
 998
 999         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
1000             (s->version != DTLS1_VERSION && s->client_version < s->version))
1001                 {
1002                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1003                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
1004                         !s->enc_write_ctx && !s->write_hash)
1005                         {
1006                         /* similar to ssl3_get_record, send alert using remote version number */
1007                         s->version = s->client_version;
1008                         }
1009                 al = SSL_AD_PROTOCOL_VERSION;
1010                 goto f_err;
1011                 }
1012
1013         /* If we require cookies and this ClientHello doesn't
1014          * contain one, just return since we do not want to
1015          * allocate any memory yet. So check cookie length...
1016          */
1017         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1018                 {
1019                 unsigned int session_length, cookie_length;
1020
1021                 session_length = *(p + SSL3_RANDOM_SIZE);
1022                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1023
1024                 if (cookie_length == 0)
1025                         return 1;
1026                 }
1027
1028         /* load the client random */
1029         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1030         p+=SSL3_RANDOM_SIZE;
1031
1032         /* get the session-id */
1033         j= *(p++);
1034
1035         s->hit=0;
1036         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1037          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1038          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1039          * than a change to default behavior so that applications relying on this for security
1040          * won't even compile against older library versions).
1041          *
1042          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1043          * renegotiation but not a new session (s->new_session remains unset): for servers,
1044          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1045          * setting will be ignored.
1046          */
1047         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1048                 {
1049                 if (!ssl_get_new_session(s,1))
1050                         goto err;
1051                 }
1052         else
1053                 {
1054                 i=ssl_get_prev_session(s, p, j, d + n);
1055                 /*
1056                  * Only resume if the session's version matches the negotiated
1057                  * version.
1058                  * RFC 5246 does not provide much useful advice on resumption
1059                  * with a different protocol version. It doesn't forbid it but
1060                  * the sanity of such behaviour would be questionable.
1061                  * In practice, clients do not accept a version mismatch and
1062                  * will abort the handshake with an error.
1063                  */
1064                 if (i == 1 && s->version == s->session->ssl_version)
1065                         { /* previous session */
1066                         s->hit=1;
1067                         }
1068                 else if (i == -1)
1069                         goto err;
1070                 else /* i == 0 */
1071                         {
1072                         if (!ssl_get_new_session(s,1))
1073                                 goto err;
1074                         }
1075                 }
1076
1077         p+=j;
1078
1079         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1080                 {
1081                 /* cookie stuff */
1082                 cookie_len = *(p++);
1083
1084                 /*
1085                  * The ClientHello may contain a cookie even if the
1086                  * HelloVerify message has not been sent--make sure that it
1087                  * does not cause an overflow.
1088                  */
1089                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1090                         {
1091                         /* too much data */
1092                         al = SSL_AD_DECODE_ERROR;
1093                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1094                         goto f_err;
1095                         }
1096
1097                 /* verify the cookie if appropriate option is set. */
1098                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1099                         cookie_len > 0)
1100                         {
1101                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1102
1103                         if ( s->ctx->app_verify_cookie_cb != NULL)
1104                                 {
1105                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1106                                         cookie_len) == 0)
1107                                         {
1108                                         al=SSL_AD_HANDSHAKE_FAILURE;
1109                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1110                                                 SSL_R_COOKIE_MISMATCH);
1111                                         goto f_err;
1112                                         }
1113                                 /* else cookie verification succeeded */
1114                                 }
1115                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1116                                                   s->d1->cookie_len) != 0) /* default verification */
1117                                 {
1118                                         al=SSL_AD_HANDSHAKE_FAILURE;
1119                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1120                                                 SSL_R_COOKIE_MISMATCH);
1121                                         goto f_err;
1122                                 }
1123
1124                         ret = 2;
1125                         }
1126
1127                 p += cookie_len;
1128                 }
1129
1130         n2s(p,i);
1131         if ((i == 0) && (j != 0))
1132                 {
1133                 /* we need a cipher if we are not resuming a session */
1134                 al=SSL_AD_ILLEGAL_PARAMETER;
1135                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1136                 goto f_err;
1137                 }
1138         if ((p+i) >= (d+n))
1139                 {
1140                 /* not enough data */
1141                 al=SSL_AD_DECODE_ERROR;
1142                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1143                 goto f_err;
1144                 }
1145         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1146                 == NULL))
1147                 {
1148                 goto err;
1149                 }
1150         p+=i;
1151
1152         /* If it is a hit, check that the cipher is in the list */
1153         if ((s->hit) && (i > 0))
1154                 {
1155                 j=0;
1156                 id=s->session->cipher->id;
1157
1158 #ifdef CIPHER_DEBUG
1159                 fprintf(stderr,"client sent %d ciphers\n",sk_SSL_CIPHER_num(ciphers));
1160 #endif
1161                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1162                         {
1163                         c=sk_SSL_CIPHER_value(ciphers,i);
1164 #ifdef CIPHER_DEBUG
1165                         fprintf(stderr,"client [%2d of %2d]:%s\n",
1166                                 i,sk_SSL_CIPHER_num(ciphers),
1167                                 SSL_CIPHER_get_name(c));
1168 #endif
1169                         if (c->id == id)
1170                                 {
1171                                 j=1;
1172                                 break;
1173                                 }
1174                         }
1175 /* Disabled because it can be used in a ciphersuite downgrade
1176  * attack: CVE-2010-4180.
1177  */
1178 #if 0
1179                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1180                         {
1181                         /* Special case as client bug workaround: the previously used cipher may
1182                          * not be in the current list, the client instead might be trying to
1183                          * continue using a cipher that before wasn't chosen due to server
1184                          * preferences.  We'll have to reject the connection if the cipher is not
1185                          * enabled, though. */
1186                         c = sk_SSL_CIPHER_value(ciphers, 0);
1187                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1188                                 {
1189                                 s->session->cipher = c;
1190                                 j = 1;
1191                                 }
1192                         }
1193 #endif
1194                 if (j == 0)
1195                         {
1196                         /* we need to have the cipher in the cipher
1197                          * list if we are asked to reuse it */
1198                         al=SSL_AD_ILLEGAL_PARAMETER;
1199                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1200                         goto f_err;
1201                         }
1202                 }
1203
1204         /* compression */
1205         i= *(p++);
1206         if ((p+i) > (d+n))
1207                 {
1208                 /* not enough data */
1209                 al=SSL_AD_DECODE_ERROR;
1210                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1211                 goto f_err;
1212                 }
1213         q=p;
1214         for (j=0; j<i; j++)
1215                 {
1216                 if (p[j] == 0) break;
1217                 }
1218
1219         p+=i;
1220         if (j >= i)
1221                 {
1222                 /* no compress */
1223                 al=SSL_AD_DECODE_ERROR;
1224                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1225                 goto f_err;
1226                 }
1227
1228 #ifndef OPENSSL_NO_TLSEXT
1229         /* TLS extensions*/
1230         if (s->version >= SSL3_VERSION)
1231                 {
1232                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1233                         {
1234                         /* 'al' set by ssl_parse_clienthello_tlsext */
1235                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1236                         goto f_err;
1237                         }
1238                 }
1239                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1240                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1241                         goto err;
1242                 }
1243
1244         /* Check if we want to use external pre-shared secret for this
1245          * handshake for not reused session only. We need to generate
1246          * server_random before calling tls_session_secret_cb in order to allow
1247          * SessionTicket processing to use it in key derivation. */
1248         {
1249                 unsigned char *pos;
1250                 pos=s->s3->server_random;
1251                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1252                         {
1253                         al=SSL_AD_INTERNAL_ERROR;
1254                         goto f_err;
1255                         }
1256         }
1257
1258         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1259                 {
1260                 SSL_CIPHER *pref_cipher=NULL;
1261
1262                 s->session->master_key_length=sizeof(s->session->master_key);
1263                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1264                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1265                         {
1266                         s->hit=1;
1267                         s->session->ciphers=ciphers;
1268                         s->session->verify_result=X509_V_OK;
1269
1270                         ciphers=NULL;
1271
1272                         /* check if some cipher was preferred by call back */
1273                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1274                         if (pref_cipher == NULL)
1275                                 {
1276                                 al=SSL_AD_HANDSHAKE_FAILURE;
1277                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1278                                 goto f_err;
1279                                 }
1280
1281                         s->session->cipher=pref_cipher;
1282
1283                         if (s->cipher_list)
1284                                 sk_SSL_CIPHER_free(s->cipher_list);
1285
1286                         if (s->cipher_list_by_id)
1287                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1288
1289                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1290                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1291                         }
1292                 }
1293 #endif
1294
1295         /* Worst case, we will use the NULL compression, but if we have other
1296          * options, we will now look for them.  We have i-1 compression
1297          * algorithms from the client, starting at q. */
1298         s->s3->tmp.new_compression=NULL;
1299 #ifndef OPENSSL_NO_COMP
1300         /* This only happens if we have a cache hit */
1301         if (s->session->compress_meth != 0)
1302                 {
1303                 int m, comp_id = s->session->compress_meth;
1304                 /* Perform sanity checks on resumed compression algorithm */
1305                 /* Can't disable compression */
1306                 if (s->options & SSL_OP_NO_COMPRESSION)
1307                         {
1308                         al=SSL_AD_INTERNAL_ERROR;
1309                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1310                         goto f_err;
1311                         }
1312                 /* Look for resumed compression method */
1313                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1314                         {
1315                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1316                         if (comp_id == comp->id)
1317                                 {
1318                                 s->s3->tmp.new_compression=comp;
1319                                 break;
1320                                 }
1321                         }
1322                 if (s->s3->tmp.new_compression == NULL)
1323                         {
1324                         al=SSL_AD_INTERNAL_ERROR;
1325                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1326                         goto f_err;
1327                         }
1328                 /* Look for resumed method in compression list */
1329                 for (m = 0; m < i; m++)
1330                         {
1331                         if (q[m] == comp_id)
1332                                 break;
1333                         }
1334                 if (m >= i)
1335                         {
1336                         al=SSL_AD_ILLEGAL_PARAMETER;
1337                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1338                         goto f_err;
1339                         }
1340                 }
1341         else if (s->hit)
1342                 comp = NULL;
1343         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1344                 { /* See if we have a match */
1345                 int m,nn,o,v,done=0;
1346
1347                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1348                 for (m=0; m<nn; m++)
1349                         {
1350                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1351                         v=comp->id;
1352                         for (o=0; o<i; o++)
1353                                 {
1354                                 if (v == q[o])
1355                                         {
1356                                         done=1;
1357                                         break;
1358                                         }
1359                                 }
1360                         if (done) break;
1361                         }
1362                 if (done)
1363                         s->s3->tmp.new_compression=comp;
1364                 else
1365                         comp=NULL;
1366                 }
1367 #else
1368         /* If compression is disabled we'd better not try to resume a session
1369          * using compression.
1370          */
1371         if (s->session->compress_meth != 0)
1372                 {
1373                 al=SSL_AD_INTERNAL_ERROR;
1374                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1375                 goto f_err;
1376                 }
1377 #endif
1378
1379         /* Given s->session->ciphers and SSL_get_ciphers, we must
1380          * pick a cipher */
1381
1382         if (!s->hit)
1383                 {
1384 #ifdef OPENSSL_NO_COMP
1385                 s->session->compress_meth=0;
1386 #else
1387                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1388 #endif
1389                 if (s->session->ciphers != NULL)
1390                         sk_SSL_CIPHER_free(s->session->ciphers);
1391                 s->session->ciphers=ciphers;
1392                 if (ciphers == NULL)
1393                         {
1394                         al=SSL_AD_ILLEGAL_PARAMETER;
1395                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1396                         goto f_err;
1397                         }
1398                 ciphers=NULL;
1399                 c=ssl3_choose_cipher(s,s->session->ciphers,
1400                                      SSL_get_ciphers(s));
1401
1402                 if (c == NULL)
1403                         {
1404                         al=SSL_AD_HANDSHAKE_FAILURE;
1405                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1406                         goto f_err;
1407                         }
1408                 s->s3->tmp.new_cipher=c;
1409                 }
1410         else
1411                 {
1412                 /* Session-id reuse */
1413 #ifdef REUSE_CIPHER_BUG
1414                 STACK_OF(SSL_CIPHER) *sk;
1415                 SSL_CIPHER *nc=NULL;
1416                 SSL_CIPHER *ec=NULL;
1417
1418                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1419                         {
1420                         sk=s->session->ciphers;
1421                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1422                                 {
1423                                 c=sk_SSL_CIPHER_value(sk,i);
1424                                 if (c->algorithm_enc & SSL_eNULL)
1425                                         nc=c;
1426                                 if (SSL_C_IS_EXPORT(c))
1427                                         ec=c;
1428                                 }
1429                         if (nc != NULL)
1430                                 s->s3->tmp.new_cipher=nc;
1431                         else if (ec != NULL)
1432                                 s->s3->tmp.new_cipher=ec;
1433                         else
1434                                 s->s3->tmp.new_cipher=s->session->cipher;
1435                         }
1436                 else
1437 #endif
1438                 s->s3->tmp.new_cipher=s->session->cipher;
1439                 }
1440
1441         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1442                 {
1443                 if (!ssl3_digest_cached_records(s))
1444                         {
1445                         al = SSL_AD_INTERNAL_ERROR;
1446                         goto f_err;
1447                         }
1448                 }
1449
1450         /* we now have the following setup.
1451          * client_random
1452          * cipher_list          - our prefered list of ciphers
1453          * ciphers              - the clients prefered list of ciphers
1454          * compression          - basically ignored right now
1455          * ssl version is set   - sslv3
1456          * s->session           - The ssl session has been setup.
1457          * s->hit               - session reuse flag
1458          * s->tmp.new_cipher    - the new cipher to use.
1459          */
1460
1461         /* Handles TLS extensions that we couldn't check earlier */
1462         if (s->version >= SSL3_VERSION)
1463                 {
1464                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1465                         {
1466                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1467                         goto err;
1468                         }
1469                 }
1470
1471         if (ret < 0) ret=1;
1472         if (0)
1473                 {
1474 f_err:
1475                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1476                 }
1477 err:
1478         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1479         return(ret);
1480         }
1481
1482 int ssl3_send_server_hello(SSL *s)
1483         {
1484         unsigned char *buf;
1485         unsigned char *p,*d;
1486         int i,sl;
1487         unsigned long l;
1488
1489         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1490                 {
1491                 buf=(unsigned char *)s->init_buf->data;
1492 #ifdef OPENSSL_NO_TLSEXT
1493                 p=s->s3->server_random;
1494                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1495                         return -1;
1496 #endif
1497                 /* Do the message type and length last */
1498                 d=p= &(buf[4]);
1499
1500                 *(p++)=s->version>>8;
1501                 *(p++)=s->version&0xff;
1502
1503                 /* Random stuff */
1504                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1505                 p+=SSL3_RANDOM_SIZE;
1506
1507                 /* There are several cases for the session ID to send
1508                  * back in the server hello:
1509                  * - For session reuse from the session cache,
1510                  *   we send back the old session ID.
1511                  * - If stateless session reuse (using a session ticket)
1512                  *   is successful, we send back the client's "session ID"
1513                  *   (which doesn't actually identify the session).
1514                  * - If it is a new session, we send back the new
1515                  *   session ID.
1516                  * - However, if we want the new session to be single-use,
1517                  *   we send back a 0-length session ID.
1518                  * s->hit is non-zero in either case of session reuse,
1519                  * so the following won't overwrite an ID that we're supposed
1520                  * to send back.
1521                  */
1522                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1523                         && !s->hit)
1524                         s->session->session_id_length=0;
1525
1526                 sl=s->session->session_id_length;
1527                 if (sl > (int)sizeof(s->session->session_id))
1528                         {
1529                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1530                         return -1;
1531                         }
1532                 *(p++)=sl;
1533                 memcpy(p,s->session->session_id,sl);
1534                 p+=sl;
1535
1536                 /* put the cipher */
1537                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1538                 p+=i;
1539
1540                 /* put the compression method */
1541 #ifdef OPENSSL_NO_COMP
1542                         *(p++)=0;
1543 #else
1544                 if (s->s3->tmp.new_compression == NULL)
1545                         *(p++)=0;
1546                 else
1547                         *(p++)=s->s3->tmp.new_compression->id;
1548 #endif
1549 #ifndef OPENSSL_NO_TLSEXT
1550                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1551                         {
1552                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1553                         return -1;
1554                         }
1555                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1556                         {
1557                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1558                         return -1;
1559                         }
1560 #endif
1561                 /* do the header */
1562                 l=(p-d);
1563                 d=buf;
1564                 *(d++)=SSL3_MT_SERVER_HELLO;
1565                 l2n3(l,d);
1566
1567                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1568                 /* number of bytes to write */
1569                 s->init_num=p-buf;
1570                 s->init_off=0;
1571                 }
1572
1573         /* SSL3_ST_SW_SRVR_HELLO_B */
1574         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1575         }
1576
1577 int ssl3_send_server_done(SSL *s)
1578         {
1579         unsigned char *p;
1580
1581         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1582                 {
1583                 p=(unsigned char *)s->init_buf->data;
1584
1585                 /* do the header */
1586                 *(p++)=SSL3_MT_SERVER_DONE;
1587                 *(p++)=0;
1588                 *(p++)=0;
1589                 *(p++)=0;
1590
1591                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1592                 /* number of bytes to write */
1593                 s->init_num=4;
1594                 s->init_off=0;
1595                 }
1596
1597         /* SSL3_ST_SW_SRVR_DONE_B */
1598         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1599         }
1600
1601 int ssl3_send_server_key_exchange(SSL *s)
1602         {
1603 #ifndef OPENSSL_NO_RSA
1604         unsigned char *q;
1605         int j,num;
1606         RSA *rsa;
1607         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1608         unsigned int u;
1609 #endif
1610 #ifndef OPENSSL_NO_DH
1611         DH *dh=NULL,*dhp;
1612 #endif
1613 #ifndef OPENSSL_NO_ECDH
1614         EC_KEY *ecdh=NULL, *ecdhp;
1615         unsigned char *encodedPoint = NULL;
1616         int encodedlen = 0;
1617         int curve_id = 0;
1618         BN_CTX *bn_ctx = NULL;
1619 #endif
1620         EVP_PKEY *pkey;
1621         const EVP_MD *md = NULL;
1622         unsigned char *p,*d;
1623         int al,i;
1624         unsigned long type;
1625         int n;
1626         CERT *cert;
1627         BIGNUM *r[4];
1628         int nr[4],kn;
1629         BUF_MEM *buf;
1630         EVP_MD_CTX md_ctx;
1631
1632         EVP_MD_CTX_init(&md_ctx);
1633         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1634                 {
1635                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1636                 cert=s->cert;
1637
1638                 buf=s->init_buf;
1639
1640                 r[0]=r[1]=r[2]=r[3]=NULL;
1641                 n=0;
1642 #ifndef OPENSSL_NO_RSA
1643                 if (type & SSL_kRSA)
1644                         {
1645                         rsa=cert->rsa_tmp;
1646                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1647                                 {
1648                                 rsa=s->cert->rsa_tmp_cb(s,
1649                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1650                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1651                                 if(rsa == NULL)
1652                                 {
1653                                         al=SSL_AD_HANDSHAKE_FAILURE;
1654                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1655                                         goto f_err;
1656                                 }
1657                                 RSA_up_ref(rsa);
1658                                 cert->rsa_tmp=rsa;
1659                                 }
1660                         if (rsa == NULL)
1661                                 {
1662                                 al=SSL_AD_HANDSHAKE_FAILURE;
1663                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1664                                 goto f_err;
1665                                 }
1666                         r[0]=rsa->n;
1667                         r[1]=rsa->e;
1668                         s->s3->tmp.use_rsa_tmp=1;
1669                         }
1670                 else
1671 #endif
1672 #ifndef OPENSSL_NO_DH
1673                         if (type & SSL_kEDH)
1674                         {
1675                         dhp=cert->dh_tmp;
1676                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1677                                 dhp=s->cert->dh_tmp_cb(s,
1678                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1679                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1680                         if (dhp == NULL)
1681                                 {
1682                                 al=SSL_AD_HANDSHAKE_FAILURE;
1683                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1684                                 goto f_err;
1685                                 }
1686
1687                         if (s->s3->tmp.dh != NULL)
1688                                 {
1689                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1690                                 goto err;
1691                                 }
1692
1693                         if ((dh=DHparams_dup(dhp)) == NULL)
1694                                 {
1695                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1696                                 goto err;
1697                                 }
1698
1699                         s->s3->tmp.dh=dh;
1700                         if ((dhp->pub_key == NULL ||
1701                              dhp->priv_key == NULL ||
1702                              (s->options & SSL_OP_SINGLE_DH_USE)))
1703                                 {
1704                                 if(!DH_generate_key(dh))
1705                                     {
1706                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1707                                            ERR_R_DH_LIB);
1708                                     goto err;
1709                                     }
1710                                 }
1711                         else
1712                                 {
1713                                 dh->pub_key=BN_dup(dhp->pub_key);
1714                                 dh->priv_key=BN_dup(dhp->priv_key);
1715                                 if ((dh->pub_key == NULL) ||
1716                                         (dh->priv_key == NULL))
1717                                         {
1718                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1719                                         goto err;
1720                                         }
1721                                 }
1722                         r[0]=dh->p;
1723                         r[1]=dh->g;
1724                         r[2]=dh->pub_key;
1725                         }
1726                 else
1727 #endif
1728 #ifndef OPENSSL_NO_ECDH
1729                         if (type & SSL_kEECDH)
1730                         {
1731                         const EC_GROUP *group;
1732
1733                         ecdhp=cert->ecdh_tmp;
1734                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1735                                 {
1736                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1737                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1738                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1739                                 }
1740                         if (ecdhp == NULL)
1741                                 {
1742                                 al=SSL_AD_HANDSHAKE_FAILURE;
1743                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1744                                 goto f_err;
1745                                 }
1746
1747                         if (s->s3->tmp.ecdh != NULL)
1748                                 {
1749                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1750                                 goto err;
1751                                 }
1752
1753                         /* Duplicate the ECDH structure. */
1754                         if (ecdhp == NULL)
1755                                 {
1756                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1757                                 goto err;
1758                                 }
1759                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1760                                 {
1761                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1762                                 goto err;
1763                                 }
1764
1765                         s->s3->tmp.ecdh=ecdh;
1766                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1767                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1768                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1769                                 {
1770                                 if(!EC_KEY_generate_key(ecdh))
1771                                     {
1772                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1773                                     goto err;
1774                                     }
1775                                 }
1776
1777                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1778                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1779                             (EC_KEY_get0_private_key(ecdh) == NULL))
1780                                 {
1781                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1782                                 goto err;
1783                                 }
1784
1785                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1786                             (EC_GROUP_get_degree(group) > 163))
1787                                 {
1788                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1789                                 goto err;
1790                                 }
1791
1792                         /* XXX: For now, we only support ephemeral ECDH
1793                          * keys over named (not generic) curves. For
1794                          * supported named curves, curve_id is non-zero.
1795                          */
1796                         if ((curve_id =
1797                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1798                             == 0)
1799                                 {
1800                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1801                                 goto err;
1802                                 }
1803
1804                         /* Encode the public key.
1805                          * First check the size of encoding and
1806                          * allocate memory accordingly.
1807                          */
1808                         encodedlen = EC_POINT_point2oct(group,
1809                             EC_KEY_get0_public_key(ecdh),
1810                             POINT_CONVERSION_UNCOMPRESSED,
1811                             NULL, 0, NULL);
1812
1813                         encodedPoint = (unsigned char *)
1814                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1815                         bn_ctx = BN_CTX_new();
1816                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1817                                 {
1818                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1819                                 goto err;
1820                                 }
1821
1822
1823                         encodedlen = EC_POINT_point2oct(group,
1824                             EC_KEY_get0_public_key(ecdh),
1825                             POINT_CONVERSION_UNCOMPRESSED,
1826                             encodedPoint, encodedlen, bn_ctx);
1827
1828                         if (encodedlen == 0)
1829                                 {
1830                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1831                                 goto err;
1832                                 }
1833
1834                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1835
1836                         /* XXX: For now, we only support named (not
1837                          * generic) curves in ECDH ephemeral key exchanges.
1838                          * In this situation, we need four additional bytes
1839                          * to encode the entire ServerECDHParams
1840                          * structure.
1841                          */
1842                         n = 4 + encodedlen;
1843
1844                         /* We'll generate the serverKeyExchange message
1845                          * explicitly so we can set these to NULLs
1846                          */
1847                         r[0]=NULL;
1848                         r[1]=NULL;
1849                         r[2]=NULL;
1850                         r[3]=NULL;
1851                         }
1852                 else
1853 #endif /* !OPENSSL_NO_ECDH */
1854 #ifndef OPENSSL_NO_PSK
1855                         if (type & SSL_kPSK)
1856                                 {
1857                                 /* reserve size for record length and PSK identity hint*/
1858                                 n+=2+strlen(s->ctx->psk_identity_hint);
1859                                 }
1860                         else
1861 #endif /* !OPENSSL_NO_PSK */
1862 #ifndef OPENSSL_NO_SRP
1863                 if (type & SSL_kSRP)
1864                         {
1865                         if ((s->srp_ctx.N == NULL) ||
1866                                 (s->srp_ctx.g == NULL) ||
1867                                 (s->srp_ctx.s == NULL) ||
1868                                 (s->srp_ctx.B == NULL))
1869                                 {
1870                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1871                                 goto err;
1872                                 }
1873                         r[0]=s->srp_ctx.N;
1874                         r[1]=s->srp_ctx.g;
1875                         r[2]=s->srp_ctx.s;
1876                         r[3]=s->srp_ctx.B;
1877                         }
1878                 else
1879 #endif
1880                         {
1881                         al=SSL_AD_HANDSHAKE_FAILURE;
1882                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1883                         goto f_err;
1884                         }
1885                 for (i=0; i < 4 && r[i] != NULL; i++)
1886                         {
1887                         nr[i]=BN_num_bytes(r[i]);
1888 #ifndef OPENSSL_NO_SRP
1889                         if ((i == 2) && (type & SSL_kSRP))
1890                                 n+=1+nr[i];
1891                         else
1892 #endif
1893                         n+=2+nr[i];
1894                         }
1895
1896                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1897                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1898                         {
1899                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1900                                 == NULL)
1901                                 {
1902                                 al=SSL_AD_DECODE_ERROR;
1903                                 goto f_err;
1904                                 }
1905                         kn=EVP_PKEY_size(pkey);
1906                         }
1907                 else
1908                         {
1909                         pkey=NULL;
1910                         kn=0;
1911                         }
1912
1913                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1914                         {
1915                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1916                         goto err;
1917                         }
1918                 d=(unsigned char *)s->init_buf->data;
1919                 p= &(d[4]);
1920
1921                 for (i=0; i < 4 && r[i] != NULL; i++)
1922                         {
1923 #ifndef OPENSSL_NO_SRP
1924                         if ((i == 2) && (type & SSL_kSRP))
1925                                 {
1926                                 *p = nr[i];
1927                                 p++;
1928                                 }
1929                         else
1930 #endif
1931                         s2n(nr[i],p);
1932                         BN_bn2bin(r[i],p);
1933                         p+=nr[i];
1934                         }
1935
1936 #ifndef OPENSSL_NO_ECDH
1937                 if (type & SSL_kEECDH)
1938                         {
1939                         /* XXX: For now, we only support named (not generic) curves.
1940                          * In this situation, the serverKeyExchange message has:
1941                          * [1 byte CurveType], [2 byte CurveName]
1942                          * [1 byte length of encoded point], followed by
1943                          * the actual encoded point itself
1944                          */
1945                         *p = NAMED_CURVE_TYPE;
1946                         p += 1;
1947                         *p = 0;
1948                         p += 1;
1949                         *p = curve_id;
1950                         p += 1;
1951                         *p = encodedlen;
1952                         p += 1;
1953                         memcpy((unsigned char*)p,
1954                             (unsigned char *)encodedPoint,
1955                             encodedlen);
1956                         OPENSSL_free(encodedPoint);
1957                         encodedPoint = NULL;
1958                         p += encodedlen;
1959                         }
1960 #endif
1961
1962 #ifndef OPENSSL_NO_PSK
1963                 if (type & SSL_kPSK)
1964                         {
1965                         /* copy PSK identity hint */
1966                         s2n(strlen(s->ctx->psk_identity_hint), p);
1967                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1968                         p+=strlen(s->ctx->psk_identity_hint);
1969                         }
1970 #endif
1971
1972                 /* not anonymous */
1973                 if (pkey != NULL)
1974                         {
1975                         /* n is the length of the params, they start at &(d[4])
1976                          * and p points to the space at the end. */
1977 #ifndef OPENSSL_NO_RSA
1978                         if (pkey->type == EVP_PKEY_RSA
1979                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1980                                 {
1981                                 q=md_buf;
1982                                 j=0;
1983                                 for (num=2; num > 0; num--)
1984                                         {
1985                                         EVP_MD_CTX_set_flags(&md_ctx,
1986                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1987                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1988                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1989                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1990                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1991                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1992                                         EVP_DigestFinal_ex(&md_ctx,q,
1993                                                 (unsigned int *)&i);
1994                                         q+=i;
1995                                         j+=i;
1996                                         }
1997                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1998                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1999                                         {
2000                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2001                                         goto err;
2002                                         }
2003                                 s2n(u,p);
2004                                 n+=u+2;
2005                                 }
2006                         else
2007 #endif
2008                         if (md)
2009                                 {
2010                                 /* For TLS1.2 and later send signature
2011                                  * algorithm */
2012                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2013                                         {
2014                                         if (!tls12_get_sigandhash(p, pkey, md))
2015                                                 {
2016                                                 /* Should never happen */
2017                                                 al=SSL_AD_INTERNAL_ERROR;
2018                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2019                                                 goto f_err;
2020                                                 }
2021                                         p+=2;
2022                                         }
2023 #ifdef SSL_DEBUG
2024                                 fprintf(stderr, "Using hash %s\n",
2025                                                         EVP_MD_name(md));
2026 #endif
2027                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2028                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2029                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2030                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2031                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2032                                         (unsigned int *)&i,pkey))
2033                                         {
2034                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2035                                         goto err;
2036                                         }
2037                                 s2n(i,p);
2038                                 n+=i+2;
2039                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2040                                         n+= 2;
2041                                 }
2042                         else
2043                                 {
2044                                 /* Is this error check actually needed? */
2045                                 al=SSL_AD_HANDSHAKE_FAILURE;
2046                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2047                                 goto f_err;
2048                                 }
2049                         }
2050
2051                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2052                 l2n3(n,d);
2053
2054                 /* we should now have things packed up, so lets send
2055                  * it off */
2056                 s->init_num=n+4;
2057                 s->init_off=0;
2058                 }
2059
2060         s->state = SSL3_ST_SW_KEY_EXCH_B;
2061         EVP_MD_CTX_cleanup(&md_ctx);
2062         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2063 f_err:
2064         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2065 err:
2066 #ifndef OPENSSL_NO_ECDH
2067         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2068         BN_CTX_free(bn_ctx);
2069 #endif
2070         EVP_MD_CTX_cleanup(&md_ctx);
2071         return(-1);
2072         }
2073
2074 int ssl3_send_certificate_request(SSL *s)
2075         {
2076         unsigned char *p,*d;
2077         int i,j,nl,off,n;
2078         STACK_OF(X509_NAME) *sk=NULL;
2079         X509_NAME *name;
2080         BUF_MEM *buf;
2081
2082         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2083                 {
2084                 buf=s->init_buf;
2085
2086                 d=p=(unsigned char *)&(buf->data[4]);
2087
2088                 /* get the list of acceptable cert types */
2089                 p++;
2090                 n=ssl3_get_req_cert_type(s,p);
2091                 d[0]=n;
2092                 p+=n;
2093                 n++;
2094
2095                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2096                         {
2097                         nl = tls12_get_req_sig_algs(s, p + 2);
2098                         s2n(nl, p);
2099                         p += nl + 2;
2100                         n += nl + 2;
2101                         }
2102
2103                 off=n;
2104                 p+=2;
2105                 n+=2;
2106
2107                 sk=SSL_get_client_CA_list(s);
2108                 nl=0;
2109                 if (sk != NULL)
2110                         {
2111                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2112                                 {
2113                                 name=sk_X509_NAME_value(sk,i);
2114                                 j=i2d_X509_NAME(name,NULL);
2115                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2116                                         {
2117                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2118                                         goto err;
2119                                         }
2120                                 p=(unsigned char *)&(buf->data[4+n]);
2121                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2122                                         {
2123                                         s2n(j,p);
2124                                         i2d_X509_NAME(name,&p);
2125                                         n+=2+j;
2126                                         nl+=2+j;
2127                                         }
2128                                 else
2129                                         {
2130                                         d=p;
2131                                         i2d_X509_NAME(name,&p);
2132                                         j-=2; s2n(j,d); j+=2;
2133                                         n+=j;
2134                                         nl+=j;
2135                                         }
2136                                 }
2137                         }
2138                 /* else no CA names */
2139                 p=(unsigned char *)&(buf->data[4+off]);
2140                 s2n(nl,p);
2141
2142                 d=(unsigned char *)buf->data;
2143                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2144                 l2n3(n,d);
2145
2146                 /* we should now have things packed up, so lets send
2147                  * it off */
2148
2149                 s->init_num=n+4;
2150                 s->init_off=0;
2151 #ifdef NETSCAPE_HANG_BUG
2152                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2153                         {
2154                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2155                         goto err;
2156                         }
2157                 p=(unsigned char *)s->init_buf->data + s->init_num;
2158
2159                 /* do the header */
2160                 *(p++)=SSL3_MT_SERVER_DONE;
2161                 *(p++)=0;
2162                 *(p++)=0;
2163                 *(p++)=0;
2164                 s->init_num += 4;
2165 #endif
2166
2167                 s->state = SSL3_ST_SW_CERT_REQ_B;
2168                 }
2169
2170         /* SSL3_ST_SW_CERT_REQ_B */
2171         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2172 err:
2173         return(-1);
2174         }
2175
2176 int ssl3_get_client_key_exchange(SSL *s)
2177         {
2178         int i,al,ok;
2179         long n;
2180         unsigned long alg_k;
2181         unsigned char *p;
2182 #ifndef OPENSSL_NO_RSA
2183         RSA *rsa=NULL;
2184         EVP_PKEY *pkey=NULL;
2185 #endif
2186 #ifndef OPENSSL_NO_DH
2187         BIGNUM *pub=NULL;
2188         DH *dh_srvr;
2189 #endif
2190 #ifndef OPENSSL_NO_KRB5
2191         KSSL_ERR kssl_err;
2192 #endif /* OPENSSL_NO_KRB5 */
2193
2194 #ifndef OPENSSL_NO_ECDH
2195         EC_KEY *srvr_ecdh = NULL;
2196         EVP_PKEY *clnt_pub_pkey = NULL;
2197         EC_POINT *clnt_ecpoint = NULL;
2198         BN_CTX *bn_ctx = NULL;
2199 #endif
2200
2201         n=s->method->ssl_get_message(s,
2202                 SSL3_ST_SR_KEY_EXCH_A,
2203                 SSL3_ST_SR_KEY_EXCH_B,
2204                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2205                 2048, /* ??? */
2206                 &ok);
2207
2208         if (!ok) return((int)n);
2209         p=(unsigned char *)s->init_msg;
2210
2211         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2212
2213 #ifndef OPENSSL_NO_RSA
2214         if (alg_k & SSL_kRSA)
2215                 {
2216                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2217                 int decrypt_len;
2218                 unsigned char decrypt_good, version_good;
2219                 size_t j;
2220
2221                 /* FIX THIS UP EAY EAY EAY EAY */
2222                 if (s->s3->tmp.use_rsa_tmp)
2223                         {
2224                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2225                                 rsa=s->cert->rsa_tmp;
2226                         /* Don't do a callback because rsa_tmp should
2227                          * be sent already */
2228                         if (rsa == NULL)
2229                                 {
2230                                 al=SSL_AD_HANDSHAKE_FAILURE;
2231                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2232                                 goto f_err;
2233
2234                                 }
2235                         }
2236                 else
2237                         {
2238                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2239                         if (    (pkey == NULL) ||
2240                                 (pkey->type != EVP_PKEY_RSA) ||
2241                                 (pkey->pkey.rsa == NULL))
2242                                 {
2243                                 al=SSL_AD_HANDSHAKE_FAILURE;
2244                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2245                                 goto f_err;
2246                                 }
2247                         rsa=pkey->pkey.rsa;
2248                         }
2249
2250                 /* TLS and [incidentally] DTLS{0xFEFF} */
2251                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2252                         {
2253                         n2s(p,i);
2254                         if (n != i+2)
2255                                 {
2256                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2257                                         {
2258                                         al = SSL_AD_DECODE_ERROR;
2259                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2260                                         goto f_err;
2261                                         }
2262                                 else
2263                                         p-=2;
2264                                 }
2265                         else
2266                                 n=i;
2267                         }
2268
2269                 /*
2270                  * Reject overly short RSA ciphertext because we want to be sure
2271                  * that the buffer size makes it safe to iterate over the entire
2272                  * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The
2273                  * actual expected size is larger due to RSA padding, but the
2274                  * bound is sufficient to be safe.
2275                  */
2276                 if (n < SSL_MAX_MASTER_KEY_LENGTH)
2277                         {
2278                         al = SSL_AD_DECRYPT_ERROR;
2279                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2280                         goto f_err;
2281                         }
2282
2283                 /* We must not leak whether a decryption failure occurs because
2284                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2285                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2286                  * the TLS RFC and generates a random premaster secret for the
2287                  * case that the decrypt fails. See
2288                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2289
2290                 /* should be RAND_bytes, but we cannot work around a failure. */
2291                 if (RAND_pseudo_bytes(rand_premaster_secret,
2292                                       sizeof(rand_premaster_secret)) <= 0)
2293                         goto err;
2294                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2295                 ERR_clear_error();
2296
2297                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2298                  * decrypt_good will be 0xff if so and zero otherwise. */
2299                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2300
2301                 /* If the version in the decrypted pre-master secret is correct
2302                  * then version_good will be 0xff, otherwise it'll be zero.
2303                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2304                  * (http://eprint.iacr.org/2003/052/) exploits the version
2305                  * number check as a "bad version oracle". Thus version checks
2306                  * are done in constant time and are treated like any other
2307                  * decryption error. */
2308                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2309                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2310
2311                 /* The premaster secret must contain the same version number as
2312                  * the ClientHello to detect version rollback attacks
2313                  * (strangely, the protocol does not offer such protection for
2314                  * DH ciphersuites). However, buggy clients exist that send the
2315                  * negotiated protocol version instead if the server does not
2316                  * support the requested protocol version. If
2317                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2318                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2319                         {
2320                         unsigned char workaround_good;
2321                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2322                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2323                         version_good |= workaround_good;
2324                         }
2325
2326                 /* Both decryption and version must be good for decrypt_good
2327                  * to remain non-zero (0xff). */
2328                 decrypt_good &= version_good;
2329
2330                 /*
2331                  * Now copy rand_premaster_secret over from p using
2332                  * decrypt_good_mask. If decryption failed, then p does not
2333                  * contain valid plaintext, however, a check above guarantees
2334                  * it is still sufficiently large to read from.
2335                  */
2336                 for (j = 0; j < sizeof(rand_premaster_secret); j++)
2337                         {
2338                         p[j] = constant_time_select_8(decrypt_good, p[j],
2339                                                       rand_premaster_secret[j]);
2340                         }
2341
2342                 s->session->master_key_length=
2343                         s->method->ssl3_enc->generate_master_secret(s,
2344                                 s->session->master_key,
2345                                 p,sizeof(rand_premaster_secret));
2346                 OPENSSL_cleanse(p,sizeof(rand_premaster_secret));
2347                 }
2348         else
2349 #endif
2350 #ifndef OPENSSL_NO_DH
2351                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2352                 {
2353                 n2s(p,i);
2354                 if (n != i+2)
2355                         {
2356                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2357                                 {
2358                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2359                                 goto err;
2360                                 }
2361                         else
2362                                 {
2363                                 p-=2;
2364                                 i=(int)n;
2365                                 }
2366                         }
2367
2368                 if (n == 0L) /* the parameters are in the cert */
2369                         {
2370                         al=SSL_AD_HANDSHAKE_FAILURE;
2371                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2372                         goto f_err;
2373                         }
2374                 else
2375                         {
2376                         if (s->s3->tmp.dh == NULL)
2377                                 {
2378                                 al=SSL_AD_HANDSHAKE_FAILURE;
2379                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2380                                 goto f_err;
2381                                 }
2382                         else
2383                                 dh_srvr=s->s3->tmp.dh;
2384                         }
2385
2386                 pub=BN_bin2bn(p,i,NULL);
2387                 if (pub == NULL)
2388                         {
2389                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2390                         goto err;
2391                         }
2392
2393                 i=DH_compute_key(p,pub,dh_srvr);
2394
2395                 if (i <= 0)
2396                         {
2397                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2398                         BN_clear_free(pub);
2399                         goto err;
2400                         }
2401
2402                 DH_free(s->s3->tmp.dh);
2403                 s->s3->tmp.dh=NULL;
2404
2405                 BN_clear_free(pub);
2406                 pub=NULL;
2407                 s->session->master_key_length=
2408                         s->method->ssl3_enc->generate_master_secret(s,
2409                                 s->session->master_key,p,i);
2410                 OPENSSL_cleanse(p,i);
2411                 }
2412         else
2413 #endif
2414 #ifndef OPENSSL_NO_KRB5
2415         if (alg_k & SSL_kKRB5)
2416                 {
2417                 krb5_error_code         krb5rc;
2418                 krb5_data               enc_ticket;
2419                 krb5_data               authenticator;
2420                 krb5_data               enc_pms;
2421                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2422                 EVP_CIPHER_CTX          ciph_ctx;
2423                 const EVP_CIPHER        *enc = NULL;
2424                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2425                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2426                                                + EVP_MAX_BLOCK_LENGTH];
2427                 int                  padl, outl;
2428                 krb5_timestamp          authtime = 0;
2429                 krb5_ticket_times       ttimes;
2430
2431                 EVP_CIPHER_CTX_init(&ciph_ctx);
2432
2433                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2434
2435                 n2s(p,i);
2436                 enc_ticket.length = i;
2437
2438                 if (n < (long)(enc_ticket.length + 6))
2439                         {
2440                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2441                                 SSL_R_DATA_LENGTH_TOO_LONG);
2442                         goto err;
2443                         }
2444
2445                 enc_ticket.data = (char *)p;
2446                 p+=enc_ticket.length;
2447
2448                 n2s(p,i);
2449                 authenticator.length = i;
2450
2451                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2452                         {
2453                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2454                                 SSL_R_DATA_LENGTH_TOO_LONG);
2455                         goto err;
2456                         }
2457
2458                 authenticator.data = (char *)p;
2459                 p+=authenticator.length;
2460
2461                 n2s(p,i);
2462                 enc_pms.length = i;
2463                 enc_pms.data = (char *)p;
2464                 p+=enc_pms.length;
2465
2466                 /* Note that the length is checked again below,
2467                 ** after decryption
2468                 */
2469                 if(enc_pms.length > sizeof pms)
2470                         {
2471                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2472                                SSL_R_DATA_LENGTH_TOO_LONG);
2473                         goto err;
2474                         }
2475
2476                 if (n != (long)(enc_ticket.length + authenticator.length +
2477                                                 enc_pms.length + 6))
2478                         {
2479                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2480                                 SSL_R_DATA_LENGTH_TOO_LONG);
2481                         goto err;
2482                         }
2483
2484                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2485                                         &kssl_err)) != 0)
2486                         {
2487 #ifdef KSSL_DEBUG
2488                         fprintf(stderr,"kssl_sget_tkt rtn %d [%d]\n",
2489                                 krb5rc, kssl_err.reason);
2490                         if (kssl_err.text)
2491                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2492 #endif  /* KSSL_DEBUG */
2493                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2494                                 kssl_err.reason);
2495                         goto err;
2496                         }
2497
2498                 /*  Note: no authenticator is not considered an error,
2499                 **  but will return authtime == 0.
2500                 */
2501                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2502                                         &authtime, &kssl_err)) != 0)
2503                         {
2504 #ifdef KSSL_DEBUG
2505                         fprintf(stderr,"kssl_check_authent rtn %d [%d]\n",
2506                                 krb5rc, kssl_err.reason);
2507                         if (kssl_err.text)
2508                                 fprintf(stderr,"kssl_err text= %s\n", kssl_err.text);
2509 #endif  /* KSSL_DEBUG */
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                 kssl_err.reason);
2512                         goto err;
2513                         }
2514
2515                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2516                         {
2517                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2518                         goto err;
2519                         }
2520
2521 #ifdef KSSL_DEBUG
2522                 kssl_ctx_show(kssl_ctx);
2523 #endif  /* KSSL_DEBUG */
2524
2525                 enc = kssl_map_enc(kssl_ctx->enctype);
2526                 if (enc == NULL)
2527                     goto err;
2528
2529                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2530
2531                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2532                         {
2533                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2534                                 SSL_R_DECRYPTION_FAILED);
2535                         goto err;
2536                         }
2537                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2538                                         (unsigned char *)enc_pms.data, enc_pms.length))
2539                         {
2540                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2541                                 SSL_R_DECRYPTION_FAILED);
2542                         goto err;
2543                         }
2544                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2545                         {
2546                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2547                                 SSL_R_DATA_LENGTH_TOO_LONG);
2548                         goto err;
2549                         }
2550                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2551                         {
2552                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2553                                 SSL_R_DECRYPTION_FAILED);
2554                         goto err;
2555                         }
2556                 outl += padl;
2557                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2558                         {
2559                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2560                                 SSL_R_DATA_LENGTH_TOO_LONG);
2561                         goto err;
2562                         }
2563                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2564                     {
2565                     /* The premaster secret must contain the same version number as the
2566                      * ClientHello to detect version rollback attacks (strangely, the
2567                      * protocol does not offer such protection for DH ciphersuites).
2568                      * However, buggy clients exist that send random bytes instead of
2569                      * the protocol version.
2570                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2571                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2572                      */
2573                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2574                         {
2575                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2576                                SSL_AD_DECODE_ERROR);
2577                         goto err;
2578                         }
2579                     }
2580
2581                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2582
2583                 s->session->master_key_length=
2584                         s->method->ssl3_enc->generate_master_secret(s,
2585                                 s->session->master_key, pms, outl);
2586
2587                 if (kssl_ctx->client_princ)
2588                         {
2589                         size_t len = strlen(kssl_ctx->client_princ);
2590                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2591                                 {
2592                                 s->session->krb5_client_princ_len = len;
2593                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2594                                 }
2595                         }
2596
2597
2598                 /*  Was doing kssl_ctx_free() here,
2599                 **  but it caused problems for apache.
2600                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2601                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2602                 */
2603                 }
2604         else
2605 #endif  /* OPENSSL_NO_KRB5 */
2606
2607 #ifndef OPENSSL_NO_ECDH
2608                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2609                 {
2610                 int ret = 1;
2611                 int field_size = 0;
2612                 const EC_KEY   *tkey;
2613                 const EC_GROUP *group;
2614                 const BIGNUM *priv_key;
2615
2616                 /* initialize structures for server's ECDH key pair */
2617                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2618                         {
2619                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2620                             ERR_R_MALLOC_FAILURE);
2621                         goto err;
2622                         }
2623
2624                 /* Let's get server private key and group information */
2625                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2626                         {
2627                         /* use the certificate */
2628                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2629                         }
2630                 else
2631                         {
2632                         /* use the ephermeral values we saved when
2633                          * generating the ServerKeyExchange msg.
2634                          */
2635                         tkey = s->s3->tmp.ecdh;
2636                         }
2637
2638                 group    = EC_KEY_get0_group(tkey);
2639                 priv_key = EC_KEY_get0_private_key(tkey);
2640
2641                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2642                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2643                         {
2644                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2645                                ERR_R_EC_LIB);
2646                         goto err;
2647                         }
2648
2649                 /* Let's get client's public key */
2650                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2651                         {
2652                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2653                             ERR_R_MALLOC_FAILURE);
2654                         goto err;
2655                         }
2656
2657                 if (n == 0L)
2658                         {
2659                         /* Client Publickey was in Client Certificate */
2660
2661                          if (alg_k & SSL_kEECDH)
2662                                  {
2663                                  al=SSL_AD_HANDSHAKE_FAILURE;
2664                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2665                                  goto f_err;
2666                                  }
2667                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2668                             == NULL) ||
2669                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2670                                 {
2671                                 /* XXX: For now, we do not support client
2672                                  * authentication using ECDH certificates
2673                                  * so this branch (n == 0L) of the code is
2674                                  * never executed. When that support is
2675                                  * added, we ought to ensure the key
2676                                  * received in the certificate is
2677                                  * authorized for key agreement.
2678                                  * ECDH_compute_key implicitly checks that
2679                                  * the two ECDH shares are for the same
2680                                  * group.
2681                                  */
2682                                 al=SSL_AD_HANDSHAKE_FAILURE;
2683                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2684                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2685                                 goto f_err;
2686                                 }
2687
2688                         if (EC_POINT_copy(clnt_ecpoint,
2689                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2690                                 {
2691                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2692                                         ERR_R_EC_LIB);
2693                                 goto err;
2694                                 }
2695                         ret = 2; /* Skip certificate verify processing */
2696                         }
2697                 else
2698                         {
2699                         /* Get client's public key from encoded point
2700                          * in the ClientKeyExchange message.
2701                          */
2702                         if ((bn_ctx = BN_CTX_new()) == NULL)
2703                                 {
2704                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2705                                     ERR_R_MALLOC_FAILURE);
2706                                 goto err;
2707                                 }
2708
2709                         /* Get encoded point length */
2710                         i = *p;
2711                         p += 1;
2712                         if (n != 1 + i)
2713                                 {
2714                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2715                                     ERR_R_EC_LIB);
2716                                 goto err;
2717                                 }
2718                         if (EC_POINT_oct2point(group,
2719                             clnt_ecpoint, p, i, bn_ctx) == 0)
2720                                 {
2721                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2722                                     ERR_R_EC_LIB);
2723                                 goto err;
2724                                 }
2725                         /* p is pointing to somewhere in the buffer
2726                          * currently, so set it to the start
2727                          */
2728                         p=(unsigned char *)s->init_buf->data;
2729                         }
2730
2731                 /* Compute the shared pre-master secret */
2732                 field_size = EC_GROUP_get_degree(group);
2733                 if (field_size <= 0)
2734                         {
2735                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2736                                ERR_R_ECDH_LIB);
2737                         goto err;
2738                         }
2739                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2740                 if (i <= 0)
2741                         {
2742                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2743                             ERR_R_ECDH_LIB);
2744                         goto err;
2745                         }
2746
2747                 EVP_PKEY_free(clnt_pub_pkey);
2748                 EC_POINT_free(clnt_ecpoint);
2749                 EC_KEY_free(srvr_ecdh);
2750                 BN_CTX_free(bn_ctx);
2751                 EC_KEY_free(s->s3->tmp.ecdh);
2752                 s->s3->tmp.ecdh = NULL;
2753
2754                 /* Compute the master secret */
2755                 s->session->master_key_length = s->method->ssl3_enc-> \
2756                     generate_master_secret(s, s->session->master_key, p, i);
2757
2758                 OPENSSL_cleanse(p, i);
2759                 return (ret);
2760                 }
2761         else
2762 #endif
2763 #ifndef OPENSSL_NO_PSK
2764                 if (alg_k & SSL_kPSK)
2765                         {
2766                         unsigned char *t = NULL;
2767                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2768                         unsigned int pre_ms_len = 0, psk_len = 0;
2769                         int psk_err = 1;
2770                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2771
2772                         al=SSL_AD_HANDSHAKE_FAILURE;
2773
2774                         n2s(p,i);
2775                         if (n != i+2)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         SSL_R_LENGTH_MISMATCH);
2779                                 goto psk_err;
2780                                 }
2781                         if (i > PSK_MAX_IDENTITY_LEN)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2784                                         SSL_R_DATA_LENGTH_TOO_LONG);
2785                                 goto psk_err;
2786                                 }
2787                         if (s->psk_server_callback == NULL)
2788                                 {
2789                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2790                                        SSL_R_PSK_NO_SERVER_CB);
2791                                 goto psk_err;
2792                                 }
2793
2794                         /* Create guaranteed NULL-terminated identity
2795                          * string for the callback */
2796                         memcpy(tmp_id, p, i);
2797                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2798                         psk_len = s->psk_server_callback(s, tmp_id,
2799                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2800                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2801
2802                         if (psk_len > PSK_MAX_PSK_LEN)
2803                                 {
2804                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2805                                         ERR_R_INTERNAL_ERROR);
2806                                 goto psk_err;
2807                                 }
2808                         else if (psk_len == 0)
2809                                 {
2810                                 /* PSK related to the given identity not found */
2811                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2812                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2813                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2814                                 goto psk_err;
2815                                 }
2816
2817                         /* create PSK pre_master_secret */
2818                         pre_ms_len=2+psk_len+2+psk_len;
2819                         t = psk_or_pre_ms;
2820                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2821                         s2n(psk_len, t);
2822                         memset(t, 0, psk_len);
2823                         t+=psk_len;
2824                         s2n(psk_len, t);
2825
2826                         if (s->session->psk_identity != NULL)
2827                                 OPENSSL_free(s->session->psk_identity);
2828                         s->session->psk_identity = BUF_strdup((char *)p);
2829                         if (s->session->psk_identity == NULL)
2830                                 {
2831                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2832                                         ERR_R_MALLOC_FAILURE);
2833                                 goto psk_err;
2834                                 }
2835
2836                         if (s->session->psk_identity_hint != NULL)
2837                                 OPENSSL_free(s->session->psk_identity_hint);
2838                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2839                         if (s->ctx->psk_identity_hint != NULL &&
2840                                 s->session->psk_identity_hint == NULL)
2841                                 {
2842                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2843                                         ERR_R_MALLOC_FAILURE);
2844                                 goto psk_err;
2845                                 }
2846
2847                         s->session->master_key_length=
2848                                 s->method->ssl3_enc->generate_master_secret(s,
2849                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2850                         psk_err = 0;
2851                 psk_err:
2852                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2853                         if (psk_err != 0)
2854                                 goto f_err;
2855                         }
2856                 else
2857 #endif
2858 #ifndef OPENSSL_NO_SRP
2859                 if (alg_k & SSL_kSRP)
2860                         {
2861                         int param_len;
2862
2863                         n2s(p,i);
2864                         param_len=i+2;
2865                         if (param_len > n)
2866                                 {
2867                                 al=SSL_AD_DECODE_ERROR;
2868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2869                                 goto f_err;
2870                                 }
2871                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2874                                 goto err;
2875                                 }
2876                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2877                                 || BN_is_zero(s->srp_ctx.A))
2878                                 {
2879                                 al=SSL_AD_ILLEGAL_PARAMETER;
2880                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2881                                 goto f_err;
2882                                 }
2883                         if (s->session->srp_username != NULL)
2884                                 OPENSSL_free(s->session->srp_username);
2885                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2886                         if (s->session->srp_username == NULL)
2887                                 {
2888                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2889                                         ERR_R_MALLOC_FAILURE);
2890                                 goto err;
2891                                 }
2892
2893                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2894                                 {
2895                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2896                                 goto err;
2897                                 }
2898
2899                         p+=i;
2900                         }
2901                 else
2902 #endif  /* OPENSSL_NO_SRP */
2903                 if (alg_k & SSL_kGOST)
2904                         {
2905                         int ret = 0;
2906                         EVP_PKEY_CTX *pkey_ctx;
2907                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2908                         unsigned char premaster_secret[32], *start;
2909                         size_t outlen=32, inlen;
2910                         unsigned long alg_a;
2911                         int Ttag, Tclass;
2912                         long Tlen;
2913
2914                         /* Get our certificate private key*/
2915                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2916                         if (alg_a & SSL_aGOST94)
2917                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2918                         else if (alg_a & SSL_aGOST01)
2919                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2920
2921                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2922                         EVP_PKEY_decrypt_init(pkey_ctx);
2923                         /* If client certificate is present and is of the same type, maybe
2924                          * use it for key exchange.  Don't mind errors from
2925                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2926                          * a client certificate for authorization only. */
2927                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2928                         if (client_pub_pkey)
2929                                 {
2930                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2931                                         ERR_clear_error();
2932                                 }
2933                         /* Decrypt session key */
2934                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2935                                 Ttag != V_ASN1_SEQUENCE ||
2936                                 Tclass != V_ASN1_UNIVERSAL)
2937                                 {
2938                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2939                                 goto gerr;
2940                                 }
2941                         start = p;
2942                         inlen = Tlen;
2943                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2944
2945                                 {
2946                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2947                                 goto gerr;
2948                                 }
2949                         /* Generate master secret */
2950                         s->session->master_key_length=
2951                                 s->method->ssl3_enc->generate_master_secret(s,
2952                                         s->session->master_key,premaster_secret,32);
2953                         /* Check if pubkey from client certificate was used */
2954                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2955                                 ret = 2;
2956                         else
2957                                 ret = 1;
2958                 gerr:
2959                         EVP_PKEY_free(client_pub_pkey);
2960                         EVP_PKEY_CTX_free(pkey_ctx);
2961                         if (ret)
2962                                 return ret;
2963                         else
2964                                 goto err;
2965                         }
2966                 else
2967                 {
2968                 al=SSL_AD_HANDSHAKE_FAILURE;
2969                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2970                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2971                 goto f_err;
2972                 }
2973
2974         return(1);
2975 f_err:
2976         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2977 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2978 err:
2979 #endif
2980 #ifndef OPENSSL_NO_ECDH
2981         EVP_PKEY_free(clnt_pub_pkey);
2982         EC_POINT_free(clnt_ecpoint);
2983         if (srvr_ecdh != NULL)
2984                 EC_KEY_free(srvr_ecdh);
2985         BN_CTX_free(bn_ctx);
2986 #endif
2987         return(-1);
2988         }
2989
2990 int ssl3_get_cert_verify(SSL *s)
2991         {
2992         EVP_PKEY *pkey=NULL;
2993         unsigned char *p;
2994         int al,ok,ret=0;
2995         long n;
2996         int type=0,i,j;
2997         X509 *peer;
2998         const EVP_MD *md = NULL;
2999         EVP_MD_CTX mctx;
3000         EVP_MD_CTX_init(&mctx);
3001
3002         n=s->method->ssl_get_message(s,
3003                 SSL3_ST_SR_CERT_VRFY_A,
3004                 SSL3_ST_SR_CERT_VRFY_B,
3005                 -1,
3006                 SSL3_RT_MAX_PLAIN_LENGTH,
3007                 &ok);
3008
3009         if (!ok) return((int)n);
3010
3011         if (s->session->peer != NULL)
3012                 {
3013                 peer=s->session->peer;
3014                 pkey=X509_get_pubkey(peer);
3015                 type=X509_certificate_type(peer,pkey);
3016                 }
3017         else
3018                 {
3019                 peer=NULL;
3020                 pkey=NULL;
3021                 }
3022
3023         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3024                 {
3025                 s->s3->tmp.reuse_message=1;
3026                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3027                         {
3028                         al=SSL_AD_UNEXPECTED_MESSAGE;
3029                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3030                         goto f_err;
3031                         }
3032                 ret=1;
3033                 goto end;
3034                 }
3035
3036         if (peer == NULL)
3037                 {
3038                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3039                 al=SSL_AD_UNEXPECTED_MESSAGE;
3040                 goto f_err;
3041                 }
3042
3043         if (!(type & EVP_PKT_SIGN))
3044                 {
3045                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3046                 al=SSL_AD_ILLEGAL_PARAMETER;
3047                 goto f_err;
3048                 }
3049
3050         if (s->s3->change_cipher_spec)
3051                 {
3052                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3053                 al=SSL_AD_UNEXPECTED_MESSAGE;
3054                 goto f_err;
3055                 }
3056
3057         /* we now have a signature that we need to verify */
3058         p=(unsigned char *)s->init_msg;
3059         /* Check for broken implementations of GOST ciphersuites */
3060         /* If key is GOST and n is exactly 64, it is bare
3061          * signature without length field */
3062         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3063                 pkey->type == NID_id_GostR3410_2001) )
3064                 {
3065                 i=64;
3066                 }
3067         else
3068                 {
3069                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3070                         {
3071                         int sigalg = tls12_get_sigid(pkey);
3072                         /* Should never happen */
3073                         if (sigalg == -1)
3074                                 {
3075                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3076                                 al=SSL_AD_INTERNAL_ERROR;
3077                                 goto f_err;
3078                                 }
3079                         /* Check key type is consistent with signature */
3080                         if (sigalg != (int)p[1])
3081                                 {
3082                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3083                                 al=SSL_AD_DECODE_ERROR;
3084                                 goto f_err;
3085                                 }
3086                         md = tls12_get_hash(p[0]);
3087                         if (md == NULL)
3088                                 {
3089                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3090                                 al=SSL_AD_DECODE_ERROR;
3091                                 goto f_err;
3092                                 }
3093 #ifdef SSL_DEBUG
3094 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3095 #endif
3096                         p += 2;
3097                         n -= 2;
3098                         }
3099                 n2s(p,i);
3100                 n-=2;
3101                 if (i > n)
3102                         {
3103                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3104                         al=SSL_AD_DECODE_ERROR;
3105                         goto f_err;
3106                         }
3107         }
3108         j=EVP_PKEY_size(pkey);
3109         if ((i > j) || (n > j) || (n <= 0))
3110                 {
3111                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3112                 al=SSL_AD_DECODE_ERROR;
3113                 goto f_err;
3114                 }
3115
3116         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3117                 {
3118                 long hdatalen = 0;
3119                 void *hdata;
3120                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3121                 if (hdatalen <= 0)
3122                         {
3123                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3124                         al=SSL_AD_INTERNAL_ERROR;
3125                         goto f_err;
3126                         }
3127 #ifdef SSL_DEBUG
3128                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3129                                                         EVP_MD_name(md));
3130 #endif
3131                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3132                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3133                         {
3134                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3135                         al=SSL_AD_INTERNAL_ERROR;
3136                         goto f_err;
3137                         }
3138
3139                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3140                         {
3141                         al=SSL_AD_DECRYPT_ERROR;
3142                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3143                         goto f_err;
3144                         }
3145                 }
3146         else
3147 #ifndef OPENSSL_NO_RSA
3148         if (pkey->type == EVP_PKEY_RSA)
3149                 {
3150                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3151                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3152                                                         pkey->pkey.rsa);
3153                 if (i < 0)
3154                         {
3155                         al=SSL_AD_DECRYPT_ERROR;
3156                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3157                         goto f_err;
3158                         }
3159                 if (i == 0)
3160                         {
3161                         al=SSL_AD_DECRYPT_ERROR;
3162                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3163                         goto f_err;
3164                         }
3165                 }
3166         else
3167 #endif
3168 #ifndef OPENSSL_NO_DSA
3169                 if (pkey->type == EVP_PKEY_DSA)
3170                 {
3171                 j=DSA_verify(pkey->save_type,
3172                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3173                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3174                 if (j <= 0)
3175                         {
3176                         /* bad signature */
3177                         al=SSL_AD_DECRYPT_ERROR;
3178                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3179                         goto f_err;
3180                         }
3181                 }
3182         else
3183 #endif
3184 #ifndef OPENSSL_NO_ECDSA
3185                 if (pkey->type == EVP_PKEY_EC)
3186                 {
3187                 j=ECDSA_verify(pkey->save_type,
3188                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3189                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3190                 if (j <= 0)
3191                         {
3192                         /* bad signature */
3193                         al=SSL_AD_DECRYPT_ERROR;
3194                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3195                             SSL_R_BAD_ECDSA_SIGNATURE);
3196                         goto f_err;
3197                         }
3198                 }
3199         else
3200 #endif
3201         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3202                 {   unsigned char signature[64];
3203                         int idx;
3204                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3205                         EVP_PKEY_verify_init(pctx);
3206                         if (i!=64) {
3207                                 fprintf(stderr,"GOST signature length is %d",i);
3208                         }
3209                         for (idx=0;idx<64;idx++) {
3210                                 signature[63-idx]=p[idx];
3211                         }
3212                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3213                         EVP_PKEY_CTX_free(pctx);
3214                         if (j<=0)
3215                                 {
3216                                 al=SSL_AD_DECRYPT_ERROR;
3217                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3218                                         SSL_R_BAD_ECDSA_SIGNATURE);
3219                                 goto f_err;
3220                                 }
3221                 }
3222         else
3223                 {
3224                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3225                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3226                 goto f_err;
3227                 }
3228
3229
3230         ret=1;
3231         if (0)
3232                 {
3233 f_err:
3234                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3235                 }
3236 end:
3237         if (s->s3->handshake_buffer)
3238                 {
3239                 BIO_free(s->s3->handshake_buffer);
3240                 s->s3->handshake_buffer = NULL;
3241                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3242                 }
3243         EVP_MD_CTX_cleanup(&mctx);
3244         EVP_PKEY_free(pkey);
3245         return(ret);
3246         }
3247
3248 int ssl3_get_client_certificate(SSL *s)
3249         {
3250         int i,ok,al,ret= -1;
3251         X509 *x=NULL;
3252         unsigned long l,nc,llen,n;
3253         const unsigned char *p,*q;
3254         unsigned char *d;
3255         STACK_OF(X509) *sk=NULL;
3256
3257         n=s->method->ssl_get_message(s,
3258                 SSL3_ST_SR_CERT_A,
3259                 SSL3_ST_SR_CERT_B,
3260                 -1,
3261                 s->max_cert_list,
3262                 &ok);
3263
3264         if (!ok) return((int)n);
3265
3266         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3267                 {
3268                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3269                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3270                         {
3271                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3272                         al=SSL_AD_HANDSHAKE_FAILURE;
3273                         goto f_err;
3274                         }
3275                 /* If tls asked for a client cert, the client must return a 0 list */
3276                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3277                         {
3278                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3279                         al=SSL_AD_UNEXPECTED_MESSAGE;
3280                         goto f_err;
3281                         }
3282                 s->s3->tmp.reuse_message=1;
3283                 return(1);
3284                 }
3285
3286         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3287                 {
3288                 al=SSL_AD_UNEXPECTED_MESSAGE;
3289                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3290                 goto f_err;
3291                 }
3292         p=d=(unsigned char *)s->init_msg;
3293
3294         if ((sk=sk_X509_new_null()) == NULL)
3295                 {
3296                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3297                 goto err;
3298                 }
3299
3300         n2l3(p,llen);
3301         if (llen+3 != n)
3302                 {
3303                 al=SSL_AD_DECODE_ERROR;
3304                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3305                 goto f_err;
3306                 }
3307         for (nc=0; nc<llen; )
3308                 {
3309                 n2l3(p,l);
3310                 if ((l+nc+3) > llen)
3311                         {
3312                         al=SSL_AD_DECODE_ERROR;
3313                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3314                         goto f_err;
3315                         }
3316
3317                 q=p;
3318                 x=d2i_X509(NULL,&p,l);
3319                 if (x == NULL)
3320                         {
3321                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3322                         goto err;
3323                         }
3324                 if (p != (q+l))
3325                         {
3326                         al=SSL_AD_DECODE_ERROR;
3327                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3328                         goto f_err;
3329                         }
3330                 if (!sk_X509_push(sk,x))
3331                         {
3332                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3333                         goto err;
3334                         }
3335                 x=NULL;
3336                 nc+=l+3;
3337                 }
3338
3339         if (sk_X509_num(sk) <= 0)
3340                 {
3341                 /* TLS does not mind 0 certs returned */
3342                 if (s->version == SSL3_VERSION)
3343                         {
3344                         al=SSL_AD_HANDSHAKE_FAILURE;
3345                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3346                         goto f_err;
3347                         }
3348                 /* Fail for TLS only if we required a certificate */
3349                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3350                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3351                         {
3352                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3353                         al=SSL_AD_HANDSHAKE_FAILURE;
3354                         goto f_err;
3355                         }
3356                 /* No client certificate so digest cached records */
3357                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3358                         {
3359                         al=SSL_AD_INTERNAL_ERROR;
3360                         goto f_err;
3361                         }
3362                 }
3363         else
3364                 {
3365                 i=ssl_verify_cert_chain(s,sk);
3366                 if (i <= 0)
3367                         {
3368                         al=ssl_verify_alarm_type(s->verify_result);
3369                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3370                         goto f_err;
3371                         }
3372                 }
3373
3374         if (s->session->peer != NULL) /* This should not be needed */
3375                 X509_free(s->session->peer);
3376         s->session->peer=sk_X509_shift(sk);
3377         s->session->verify_result = s->verify_result;
3378
3379         /* With the current implementation, sess_cert will always be NULL
3380          * when we arrive here. */
3381         if (s->session->sess_cert == NULL)
3382                 {
3383                 s->session->sess_cert = ssl_sess_cert_new();
3384                 if (s->session->sess_cert == NULL)
3385                         {
3386                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3387                         goto err;
3388                         }
3389                 }
3390         if (s->session->sess_cert->cert_chain != NULL)
3391                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3392         s->session->sess_cert->cert_chain=sk;
3393         /* Inconsistency alert: cert_chain does *not* include the
3394          * peer's own certificate, while we do include it in s3_clnt.c */
3395
3396         sk=NULL;
3397
3398         ret=1;
3399         if (0)
3400                 {
3401 f_err:
3402                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3403                 }
3404 err:
3405         if (x != NULL) X509_free(x);
3406         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3407         return(ret);
3408         }
3409
3410 int ssl3_send_server_certificate(SSL *s)
3411         {
3412         unsigned long l;
3413         X509 *x;
3414
3415         if (s->state == SSL3_ST_SW_CERT_A)
3416                 {
3417                 x=ssl_get_server_send_cert(s);
3418                 if (x == NULL)
3419                         {
3420                         /* VRS: allow null cert if auth == KRB5 */
3421                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3422                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3423                                 {
3424                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3425                                 return(0);
3426                                 }
3427                         }
3428
3429                 l=ssl3_output_cert_chain(s,x);
3430                 if (!l)
3431                         {
3432                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3433                         return(0);
3434                         }
3435                 s->state=SSL3_ST_SW_CERT_B;
3436                 s->init_num=(int)l;
3437                 s->init_off=0;
3438                 }
3439
3440         /* SSL3_ST_SW_CERT_B */
3441         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3442         }
3443
3444 #ifndef OPENSSL_NO_TLSEXT
3445 /* send a new session ticket (not necessarily for a new session) */
3446 int ssl3_send_newsession_ticket(SSL *s)
3447         {
3448         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3449                 {
3450                 unsigned char *p, *senc, *macstart;
3451                 const unsigned char *const_p;
3452                 int len, slen_full, slen;
3453                 SSL_SESSION *sess;
3454                 unsigned int hlen;
3455                 EVP_CIPHER_CTX ctx;
3456                 HMAC_CTX hctx;
3457                 SSL_CTX *tctx = s->initial_ctx;
3458                 unsigned char iv[EVP_MAX_IV_LENGTH];
3459                 unsigned char key_name[16];
3460
3461                 /* get session encoding length */
3462                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3463                 /* Some length values are 16 bits, so forget it if session is
3464                  * too long
3465                  */
3466                 if (slen_full > 0xFF00)
3467                         return -1;
3468                 senc = OPENSSL_malloc(slen_full);
3469                 if (!senc)
3470                         return -1;
3471                 p = senc;
3472                 i2d_SSL_SESSION(s->session, &p);
3473
3474                 /* create a fresh copy (not shared with other threads) to clean up */
3475                 const_p = senc;
3476                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3477                 if (sess == NULL)
3478                         {
3479                         OPENSSL_free(senc);
3480                         return -1;
3481                         }
3482                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3483
3484                 slen = i2d_SSL_SESSION(sess, NULL);
3485                 if (slen > slen_full) /* shouldn't ever happen */
3486                         {
3487                         OPENSSL_free(senc);
3488                         return -1;
3489                         }
3490                 p = senc;
3491                 i2d_SSL_SESSION(sess, &p);
3492                 SSL_SESSION_free(sess);
3493
3494                 /* Grow buffer if need be: the length calculation is as
3495                  * follows 1 (size of message name) + 3 (message length
3496                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3497                  * 16 (key name) + max_iv_len (iv length) +
3498                  * session_length + max_enc_block_size (max encrypted session
3499                  * length) + max_md_size (HMAC).
3500                  */
3501                 if (!BUF_MEM_grow(s->init_buf,
3502                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3503                         EVP_MAX_MD_SIZE + slen))
3504                         return -1;
3505
3506                 p=(unsigned char *)s->init_buf->data;
3507                 /* do the header */
3508                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3509                 /* Skip message length for now */
3510                 p += 3;
3511                 EVP_CIPHER_CTX_init(&ctx);
3512                 HMAC_CTX_init(&hctx);
3513                 /* Initialize HMAC and cipher contexts. If callback present
3514                  * it does all the work otherwise use generated values
3515                  * from parent ctx.
3516                  */
3517                 if (tctx->tlsext_ticket_key_cb)
3518                         {
3519                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3520                                                          &hctx, 1) < 0)
3521                                 {
3522                                 OPENSSL_free(senc);
3523                                 return -1;
3524                                 }
3525                         }
3526                 else
3527                         {
3528                         RAND_pseudo_bytes(iv, 16);
3529                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3530                                         tctx->tlsext_tick_aes_key, iv);
3531                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3532                                         tlsext_tick_md(), NULL);
3533                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3534                         }
3535
3536                 /* Ticket lifetime hint (advisory only):
3537                  * We leave this unspecified for resumed session (for simplicity),
3538                  * and guess that tickets for new sessions will live as long
3539                  * as their sessions. */
3540                 l2n(s->hit ? 0 : s->session->timeout, p);
3541
3542                 /* Skip ticket length for now */
3543                 p += 2;
3544                 /* Output key name */
3545                 macstart = p;
3546                 memcpy(p, key_name, 16);
3547                 p += 16;
3548                 /* output IV */
3549                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3550                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3551                 /* Encrypt session data */
3552                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3553                 p += len;
3554                 EVP_EncryptFinal(&ctx, p, &len);
3555                 p += len;
3556                 EVP_CIPHER_CTX_cleanup(&ctx);
3557
3558                 HMAC_Update(&hctx, macstart, p - macstart);
3559                 HMAC_Final(&hctx, p, &hlen);
3560                 HMAC_CTX_cleanup(&hctx);
3561
3562                 p += hlen;
3563                 /* Now write out lengths: p points to end of data written */
3564                 /* Total length */
3565                 len = p - (unsigned char *)s->init_buf->data;
3566                 p=(unsigned char *)s->init_buf->data + 1;
3567                 l2n3(len - 4, p); /* Message length */
3568                 p += 4;
3569                 s2n(len - 10, p);  /* Ticket length */
3570
3571                 /* number of bytes to write */
3572                 s->init_num= len;
3573                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3574                 s->init_off=0;
3575                 OPENSSL_free(senc);
3576                 }
3577
3578         /* SSL3_ST_SW_SESSION_TICKET_B */
3579         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3580         }
3581
3582 int ssl3_send_cert_status(SSL *s)
3583         {
3584         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3585                 {
3586                 unsigned char *p;
3587                 /* Grow buffer if need be: the length calculation is as
3588                  * follows 1 (message type) + 3 (message length) +
3589                  * 1 (ocsp response type) + 3 (ocsp response length)
3590                  * + (ocsp response)
3591                  */
3592                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3593                         return -1;
3594
3595                 p=(unsigned char *)s->init_buf->data;
3596
3597                 /* do the header */
3598                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3599                 /* message length */
3600                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3601                 /* status type */
3602                 *(p++)= s->tlsext_status_type;
3603                 /* length of OCSP response */
3604                 l2n3(s->tlsext_ocsp_resplen, p);
3605                 /* actual response */
3606                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3607                 /* number of bytes to write */
3608                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3609                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3610                 s->init_off = 0;
3611                 }
3612
3613         /* SSL3_ST_SW_CERT_STATUS_B */
3614         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3615         }
3616
3617 # ifndef OPENSSL_NO_NEXTPROTONEG
3618 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3619  * sets the next_proto member in s if found */
3620 int ssl3_get_next_proto(SSL *s)
3621         {
3622         int ok;
3623         int proto_len, padding_len;
3624         long n;
3625         const unsigned char *p;
3626
3627         /* Clients cannot send a NextProtocol message if we didn't see the
3628          * extension in their ClientHello */
3629         if (!s->s3->next_proto_neg_seen)
3630                 {
3631                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3632                 return -1;
3633                 }
3634
3635         n=s->method->ssl_get_message(s,
3636                 SSL3_ST_SR_NEXT_PROTO_A,
3637                 SSL3_ST_SR_NEXT_PROTO_B,
3638                 SSL3_MT_NEXT_PROTO,
3639                 514,  /* See the payload format below */
3640                 &ok);
3641
3642         if (!ok)
3643                 return((int)n);
3644
3645         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3646          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3647          * by ssl3_get_finished). */
3648         if (!s->s3->change_cipher_spec)
3649                 {
3650                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3651                 return -1;
3652                 }
3653
3654         if (n < 2)
3655                 return 0;  /* The body must be > 1 bytes long */
3656
3657         p=(unsigned char *)s->init_msg;
3658
3659         /* The payload looks like:
3660          *   uint8 proto_len;
3661          *   uint8 proto[proto_len];
3662          *   uint8 padding_len;
3663          *   uint8 padding[padding_len];
3664          */
3665         proto_len = p[0];
3666         if (proto_len + 2 > s->init_num)
3667                 return 0;
3668         padding_len = p[proto_len + 1];
3669         if (proto_len + padding_len + 2 != s->init_num)
3670                 return 0;
3671
3672         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3673         if (!s->next_proto_negotiated)
3674                 {
3675                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3676                 return 0;
3677                 }
3678         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3679         s->next_proto_negotiated_len = proto_len;
3680
3681         return 1;
3682         }
3683 # endif
3684 #endif