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                 printf("client sent %d ciphers\n",sk_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                         printf("client [%2d of %2d]:%s\n",
1166                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1167 #endif
1168                         if (c->id == id)
1169                                 {
1170                                 j=1;
1171                                 break;
1172                                 }
1173                         }
1174 /* Disabled because it can be used in a ciphersuite downgrade
1175  * attack: CVE-2010-4180.
1176  */
1177 #if 0
1178                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1179                         {
1180                         /* Special case as client bug workaround: the previously used cipher may
1181                          * not be in the current list, the client instead might be trying to
1182                          * continue using a cipher that before wasn't chosen due to server
1183                          * preferences.  We'll have to reject the connection if the cipher is not
1184                          * enabled, though. */
1185                         c = sk_SSL_CIPHER_value(ciphers, 0);
1186                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1187                                 {
1188                                 s->session->cipher = c;
1189                                 j = 1;
1190                                 }
1191                         }
1192 #endif
1193                 if (j == 0)
1194                         {
1195                         /* we need to have the cipher in the cipher
1196                          * list if we are asked to reuse it */
1197                         al=SSL_AD_ILLEGAL_PARAMETER;
1198                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1199                         goto f_err;
1200                         }
1201                 }
1202
1203         /* compression */
1204         i= *(p++);
1205         if ((p+i) > (d+n))
1206                 {
1207                 /* not enough data */
1208                 al=SSL_AD_DECODE_ERROR;
1209                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1210                 goto f_err;
1211                 }
1212         q=p;
1213         for (j=0; j<i; j++)
1214                 {
1215                 if (p[j] == 0) break;
1216                 }
1217
1218         p+=i;
1219         if (j >= i)
1220                 {
1221                 /* no compress */
1222                 al=SSL_AD_DECODE_ERROR;
1223                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1224                 goto f_err;
1225                 }
1226
1227 #ifndef OPENSSL_NO_TLSEXT
1228         /* TLS extensions*/
1229         if (s->version >= SSL3_VERSION)
1230                 {
1231                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1232                         {
1233                         /* 'al' set by ssl_parse_clienthello_tlsext */
1234                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1235                         goto f_err;
1236                         }
1237                 }
1238                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1239                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1240                         goto err;
1241                 }
1242
1243         /* Check if we want to use external pre-shared secret for this
1244          * handshake for not reused session only. We need to generate
1245          * server_random before calling tls_session_secret_cb in order to allow
1246          * SessionTicket processing to use it in key derivation. */
1247         {
1248                 unsigned char *pos;
1249                 pos=s->s3->server_random;
1250                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1251                         {
1252                         al=SSL_AD_INTERNAL_ERROR;
1253                         goto f_err;
1254                         }
1255         }
1256
1257         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1258                 {
1259                 SSL_CIPHER *pref_cipher=NULL;
1260
1261                 s->session->master_key_length=sizeof(s->session->master_key);
1262                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1263                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1264                         {
1265                         s->hit=1;
1266                         s->session->ciphers=ciphers;
1267                         s->session->verify_result=X509_V_OK;
1268
1269                         ciphers=NULL;
1270
1271                         /* check if some cipher was preferred by call back */
1272                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1273                         if (pref_cipher == NULL)
1274                                 {
1275                                 al=SSL_AD_HANDSHAKE_FAILURE;
1276                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1277                                 goto f_err;
1278                                 }
1279
1280                         s->session->cipher=pref_cipher;
1281
1282                         if (s->cipher_list)
1283                                 sk_SSL_CIPHER_free(s->cipher_list);
1284
1285                         if (s->cipher_list_by_id)
1286                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1287
1288                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1289                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1290                         }
1291                 }
1292 #endif
1293
1294         /* Worst case, we will use the NULL compression, but if we have other
1295          * options, we will now look for them.  We have i-1 compression
1296          * algorithms from the client, starting at q. */
1297         s->s3->tmp.new_compression=NULL;
1298 #ifndef OPENSSL_NO_COMP
1299         /* This only happens if we have a cache hit */
1300         if (s->session->compress_meth != 0)
1301                 {
1302                 int m, comp_id = s->session->compress_meth;
1303                 /* Perform sanity checks on resumed compression algorithm */
1304                 /* Can't disable compression */
1305                 if (s->options & SSL_OP_NO_COMPRESSION)
1306                         {
1307                         al=SSL_AD_INTERNAL_ERROR;
1308                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1309                         goto f_err;
1310                         }
1311                 /* Look for resumed compression method */
1312                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1313                         {
1314                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1315                         if (comp_id == comp->id)
1316                                 {
1317                                 s->s3->tmp.new_compression=comp;
1318                                 break;
1319                                 }
1320                         }
1321                 if (s->s3->tmp.new_compression == NULL)
1322                         {
1323                         al=SSL_AD_INTERNAL_ERROR;
1324                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1325                         goto f_err;
1326                         }
1327                 /* Look for resumed method in compression list */
1328                 for (m = 0; m < i; m++)
1329                         {
1330                         if (q[m] == comp_id)
1331                                 break;
1332                         }
1333                 if (m >= i)
1334                         {
1335                         al=SSL_AD_ILLEGAL_PARAMETER;
1336                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1337                         goto f_err;
1338                         }
1339                 }
1340         else if (s->hit)
1341                 comp = NULL;
1342         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1343                 { /* See if we have a match */
1344                 int m,nn,o,v,done=0;
1345
1346                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1347                 for (m=0; m<nn; m++)
1348                         {
1349                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1350                         v=comp->id;
1351                         for (o=0; o<i; o++)
1352                                 {
1353                                 if (v == q[o])
1354                                         {
1355                                         done=1;
1356                                         break;
1357                                         }
1358                                 }
1359                         if (done) break;
1360                         }
1361                 if (done)
1362                         s->s3->tmp.new_compression=comp;
1363                 else
1364                         comp=NULL;
1365                 }
1366 #else
1367         /* If compression is disabled we'd better not try to resume a session
1368          * using compression.
1369          */
1370         if (s->session->compress_meth != 0)
1371                 {
1372                 al=SSL_AD_INTERNAL_ERROR;
1373                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1374                 goto f_err;
1375                 }
1376 #endif
1377
1378         /* Given s->session->ciphers and SSL_get_ciphers, we must
1379          * pick a cipher */
1380
1381         if (!s->hit)
1382                 {
1383 #ifdef OPENSSL_NO_COMP
1384                 s->session->compress_meth=0;
1385 #else
1386                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1387 #endif
1388                 if (s->session->ciphers != NULL)
1389                         sk_SSL_CIPHER_free(s->session->ciphers);
1390                 s->session->ciphers=ciphers;
1391                 if (ciphers == NULL)
1392                         {
1393                         al=SSL_AD_ILLEGAL_PARAMETER;
1394                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1395                         goto f_err;
1396                         }
1397                 ciphers=NULL;
1398                 c=ssl3_choose_cipher(s,s->session->ciphers,
1399                                      SSL_get_ciphers(s));
1400
1401                 if (c == NULL)
1402                         {
1403                         al=SSL_AD_HANDSHAKE_FAILURE;
1404                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1405                         goto f_err;
1406                         }
1407                 s->s3->tmp.new_cipher=c;
1408                 }
1409         else
1410                 {
1411                 /* Session-id reuse */
1412 #ifdef REUSE_CIPHER_BUG
1413                 STACK_OF(SSL_CIPHER) *sk;
1414                 SSL_CIPHER *nc=NULL;
1415                 SSL_CIPHER *ec=NULL;
1416
1417                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1418                         {
1419                         sk=s->session->ciphers;
1420                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1421                                 {
1422                                 c=sk_SSL_CIPHER_value(sk,i);
1423                                 if (c->algorithm_enc & SSL_eNULL)
1424                                         nc=c;
1425                                 if (SSL_C_IS_EXPORT(c))
1426                                         ec=c;
1427                                 }
1428                         if (nc != NULL)
1429                                 s->s3->tmp.new_cipher=nc;
1430                         else if (ec != NULL)
1431                                 s->s3->tmp.new_cipher=ec;
1432                         else
1433                                 s->s3->tmp.new_cipher=s->session->cipher;
1434                         }
1435                 else
1436 #endif
1437                 s->s3->tmp.new_cipher=s->session->cipher;
1438                 }
1439
1440         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1441                 {
1442                 if (!ssl3_digest_cached_records(s))
1443                         {
1444                         al = SSL_AD_INTERNAL_ERROR;
1445                         goto f_err;
1446                         }
1447                 }
1448
1449         /* we now have the following setup.
1450          * client_random
1451          * cipher_list          - our prefered list of ciphers
1452          * ciphers              - the clients prefered list of ciphers
1453          * compression          - basically ignored right now
1454          * ssl version is set   - sslv3
1455          * s->session           - The ssl session has been setup.
1456          * s->hit               - session reuse flag
1457          * s->tmp.new_cipher    - the new cipher to use.
1458          */
1459
1460         /* Handles TLS extensions that we couldn't check earlier */
1461         if (s->version >= SSL3_VERSION)
1462                 {
1463                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1464                         {
1465                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1466                         goto err;
1467                         }
1468                 }
1469
1470         if (ret < 0) ret=1;
1471         if (0)
1472                 {
1473 f_err:
1474                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1475                 }
1476 err:
1477         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1478         return(ret);
1479         }
1480
1481 int ssl3_send_server_hello(SSL *s)
1482         {
1483         unsigned char *buf;
1484         unsigned char *p,*d;
1485         int i,sl;
1486         unsigned long l;
1487
1488         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1489                 {
1490                 buf=(unsigned char *)s->init_buf->data;
1491 #ifdef OPENSSL_NO_TLSEXT
1492                 p=s->s3->server_random;
1493                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1494                         return -1;
1495 #endif
1496                 /* Do the message type and length last */
1497                 d=p= &(buf[4]);
1498
1499                 *(p++)=s->version>>8;
1500                 *(p++)=s->version&0xff;
1501
1502                 /* Random stuff */
1503                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1504                 p+=SSL3_RANDOM_SIZE;
1505
1506                 /* There are several cases for the session ID to send
1507                  * back in the server hello:
1508                  * - For session reuse from the session cache,
1509                  *   we send back the old session ID.
1510                  * - If stateless session reuse (using a session ticket)
1511                  *   is successful, we send back the client's "session ID"
1512                  *   (which doesn't actually identify the session).
1513                  * - If it is a new session, we send back the new
1514                  *   session ID.
1515                  * - However, if we want the new session to be single-use,
1516                  *   we send back a 0-length session ID.
1517                  * s->hit is non-zero in either case of session reuse,
1518                  * so the following won't overwrite an ID that we're supposed
1519                  * to send back.
1520                  */
1521                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1522                         && !s->hit)
1523                         s->session->session_id_length=0;
1524
1525                 sl=s->session->session_id_length;
1526                 if (sl > (int)sizeof(s->session->session_id))
1527                         {
1528                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1529                         return -1;
1530                         }
1531                 *(p++)=sl;
1532                 memcpy(p,s->session->session_id,sl);
1533                 p+=sl;
1534
1535                 /* put the cipher */
1536                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1537                 p+=i;
1538
1539                 /* put the compression method */
1540 #ifdef OPENSSL_NO_COMP
1541                         *(p++)=0;
1542 #else
1543                 if (s->s3->tmp.new_compression == NULL)
1544                         *(p++)=0;
1545                 else
1546                         *(p++)=s->s3->tmp.new_compression->id;
1547 #endif
1548 #ifndef OPENSSL_NO_TLSEXT
1549                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1550                         {
1551                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1552                         return -1;
1553                         }
1554                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1555                         {
1556                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1557                         return -1;
1558                         }
1559 #endif
1560                 /* do the header */
1561                 l=(p-d);
1562                 d=buf;
1563                 *(d++)=SSL3_MT_SERVER_HELLO;
1564                 l2n3(l,d);
1565
1566                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1567                 /* number of bytes to write */
1568                 s->init_num=p-buf;
1569                 s->init_off=0;
1570                 }
1571
1572         /* SSL3_ST_SW_SRVR_HELLO_B */
1573         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1574         }
1575
1576 int ssl3_send_server_done(SSL *s)
1577         {
1578         unsigned char *p;
1579
1580         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1581                 {
1582                 p=(unsigned char *)s->init_buf->data;
1583
1584                 /* do the header */
1585                 *(p++)=SSL3_MT_SERVER_DONE;
1586                 *(p++)=0;
1587                 *(p++)=0;
1588                 *(p++)=0;
1589
1590                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1591                 /* number of bytes to write */
1592                 s->init_num=4;
1593                 s->init_off=0;
1594                 }
1595
1596         /* SSL3_ST_SW_SRVR_DONE_B */
1597         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1598         }
1599
1600 int ssl3_send_server_key_exchange(SSL *s)
1601         {
1602 #ifndef OPENSSL_NO_RSA
1603         unsigned char *q;
1604         int j,num;
1605         RSA *rsa;
1606         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1607         unsigned int u;
1608 #endif
1609 #ifndef OPENSSL_NO_DH
1610         DH *dh=NULL,*dhp;
1611 #endif
1612 #ifndef OPENSSL_NO_ECDH
1613         EC_KEY *ecdh=NULL, *ecdhp;
1614         unsigned char *encodedPoint = NULL;
1615         int encodedlen = 0;
1616         int curve_id = 0;
1617         BN_CTX *bn_ctx = NULL;
1618 #endif
1619         EVP_PKEY *pkey;
1620         const EVP_MD *md = NULL;
1621         unsigned char *p,*d;
1622         int al,i;
1623         unsigned long type;
1624         int n;
1625         CERT *cert;
1626         BIGNUM *r[4];
1627         int nr[4],kn;
1628         BUF_MEM *buf;
1629         EVP_MD_CTX md_ctx;
1630
1631         EVP_MD_CTX_init(&md_ctx);
1632         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1633                 {
1634                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1635                 cert=s->cert;
1636
1637                 buf=s->init_buf;
1638
1639                 r[0]=r[1]=r[2]=r[3]=NULL;
1640                 n=0;
1641 #ifndef OPENSSL_NO_RSA
1642                 if (type & SSL_kRSA)
1643                         {
1644                         rsa=cert->rsa_tmp;
1645                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1646                                 {
1647                                 rsa=s->cert->rsa_tmp_cb(s,
1648                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1649                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1650                                 if(rsa == NULL)
1651                                 {
1652                                         al=SSL_AD_HANDSHAKE_FAILURE;
1653                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1654                                         goto f_err;
1655                                 }
1656                                 RSA_up_ref(rsa);
1657                                 cert->rsa_tmp=rsa;
1658                                 }
1659                         if (rsa == NULL)
1660                                 {
1661                                 al=SSL_AD_HANDSHAKE_FAILURE;
1662                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1663                                 goto f_err;
1664                                 }
1665                         r[0]=rsa->n;
1666                         r[1]=rsa->e;
1667                         s->s3->tmp.use_rsa_tmp=1;
1668                         }
1669                 else
1670 #endif
1671 #ifndef OPENSSL_NO_DH
1672                         if (type & SSL_kEDH)
1673                         {
1674                         dhp=cert->dh_tmp;
1675                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1676                                 dhp=s->cert->dh_tmp_cb(s,
1677                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1678                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1679                         if (dhp == NULL)
1680                                 {
1681                                 al=SSL_AD_HANDSHAKE_FAILURE;
1682                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1683                                 goto f_err;
1684                                 }
1685
1686                         if (s->s3->tmp.dh != NULL)
1687                                 {
1688                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1689                                 goto err;
1690                                 }
1691
1692                         if ((dh=DHparams_dup(dhp)) == NULL)
1693                                 {
1694                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1695                                 goto err;
1696                                 }
1697
1698                         s->s3->tmp.dh=dh;
1699                         if ((dhp->pub_key == NULL ||
1700                              dhp->priv_key == NULL ||
1701                              (s->options & SSL_OP_SINGLE_DH_USE)))
1702                                 {
1703                                 if(!DH_generate_key(dh))
1704                                     {
1705                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1706                                            ERR_R_DH_LIB);
1707                                     goto err;
1708                                     }
1709                                 }
1710                         else
1711                                 {
1712                                 dh->pub_key=BN_dup(dhp->pub_key);
1713                                 dh->priv_key=BN_dup(dhp->priv_key);
1714                                 if ((dh->pub_key == NULL) ||
1715                                         (dh->priv_key == NULL))
1716                                         {
1717                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1718                                         goto err;
1719                                         }
1720                                 }
1721                         r[0]=dh->p;
1722                         r[1]=dh->g;
1723                         r[2]=dh->pub_key;
1724                         }
1725                 else
1726 #endif
1727 #ifndef OPENSSL_NO_ECDH
1728                         if (type & SSL_kEECDH)
1729                         {
1730                         const EC_GROUP *group;
1731
1732                         ecdhp=cert->ecdh_tmp;
1733                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1734                                 {
1735                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1736                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1737                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1738                                 }
1739                         if (ecdhp == NULL)
1740                                 {
1741                                 al=SSL_AD_HANDSHAKE_FAILURE;
1742                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1743                                 goto f_err;
1744                                 }
1745
1746                         if (s->s3->tmp.ecdh != NULL)
1747                                 {
1748                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1749                                 goto err;
1750                                 }
1751
1752                         /* Duplicate the ECDH structure. */
1753                         if (ecdhp == NULL)
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1756                                 goto err;
1757                                 }
1758                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1759                                 {
1760                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1761                                 goto err;
1762                                 }
1763
1764                         s->s3->tmp.ecdh=ecdh;
1765                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1766                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1767                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1768                                 {
1769                                 if(!EC_KEY_generate_key(ecdh))
1770                                     {
1771                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1772                                     goto err;
1773                                     }
1774                                 }
1775
1776                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1777                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1778                             (EC_KEY_get0_private_key(ecdh) == NULL))
1779                                 {
1780                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1781                                 goto err;
1782                                 }
1783
1784                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1785                             (EC_GROUP_get_degree(group) > 163))
1786                                 {
1787                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1788                                 goto err;
1789                                 }
1790
1791                         /* XXX: For now, we only support ephemeral ECDH
1792                          * keys over named (not generic) curves. For
1793                          * supported named curves, curve_id is non-zero.
1794                          */
1795                         if ((curve_id =
1796                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1797                             == 0)
1798                                 {
1799                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1800                                 goto err;
1801                                 }
1802
1803                         /* Encode the public key.
1804                          * First check the size of encoding and
1805                          * allocate memory accordingly.
1806                          */
1807                         encodedlen = EC_POINT_point2oct(group,
1808                             EC_KEY_get0_public_key(ecdh),
1809                             POINT_CONVERSION_UNCOMPRESSED,
1810                             NULL, 0, NULL);
1811
1812                         encodedPoint = (unsigned char *)
1813                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1814                         bn_ctx = BN_CTX_new();
1815                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1816                                 {
1817                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1818                                 goto err;
1819                                 }
1820
1821
1822                         encodedlen = EC_POINT_point2oct(group,
1823                             EC_KEY_get0_public_key(ecdh),
1824                             POINT_CONVERSION_UNCOMPRESSED,
1825                             encodedPoint, encodedlen, bn_ctx);
1826
1827                         if (encodedlen == 0)
1828                                 {
1829                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1830                                 goto err;
1831                                 }
1832
1833                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1834
1835                         /* XXX: For now, we only support named (not
1836                          * generic) curves in ECDH ephemeral key exchanges.
1837                          * In this situation, we need four additional bytes
1838                          * to encode the entire ServerECDHParams
1839                          * structure.
1840                          */
1841                         n = 4 + encodedlen;
1842
1843                         /* We'll generate the serverKeyExchange message
1844                          * explicitly so we can set these to NULLs
1845                          */
1846                         r[0]=NULL;
1847                         r[1]=NULL;
1848                         r[2]=NULL;
1849                         r[3]=NULL;
1850                         }
1851                 else
1852 #endif /* !OPENSSL_NO_ECDH */
1853 #ifndef OPENSSL_NO_PSK
1854                         if (type & SSL_kPSK)
1855                                 {
1856                                 /* reserve size for record length and PSK identity hint*/
1857                                 n+=2+strlen(s->ctx->psk_identity_hint);
1858                                 }
1859                         else
1860 #endif /* !OPENSSL_NO_PSK */
1861 #ifndef OPENSSL_NO_SRP
1862                 if (type & SSL_kSRP)
1863                         {
1864                         if ((s->srp_ctx.N == NULL) ||
1865                                 (s->srp_ctx.g == NULL) ||
1866                                 (s->srp_ctx.s == NULL) ||
1867                                 (s->srp_ctx.B == NULL))
1868                                 {
1869                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1870                                 goto err;
1871                                 }
1872                         r[0]=s->srp_ctx.N;
1873                         r[1]=s->srp_ctx.g;
1874                         r[2]=s->srp_ctx.s;
1875                         r[3]=s->srp_ctx.B;
1876                         }
1877                 else
1878 #endif
1879                         {
1880                         al=SSL_AD_HANDSHAKE_FAILURE;
1881                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1882                         goto f_err;
1883                         }
1884                 for (i=0; i < 4 && r[i] != NULL; i++)
1885                         {
1886                         nr[i]=BN_num_bytes(r[i]);
1887 #ifndef OPENSSL_NO_SRP
1888                         if ((i == 2) && (type & SSL_kSRP))
1889                                 n+=1+nr[i];
1890                         else
1891 #endif
1892                         n+=2+nr[i];
1893                         }
1894
1895                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1896                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1897                         {
1898                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1899                                 == NULL)
1900                                 {
1901                                 al=SSL_AD_DECODE_ERROR;
1902                                 goto f_err;
1903                                 }
1904                         kn=EVP_PKEY_size(pkey);
1905                         }
1906                 else
1907                         {
1908                         pkey=NULL;
1909                         kn=0;
1910                         }
1911
1912                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1913                         {
1914                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1915                         goto err;
1916                         }
1917                 d=(unsigned char *)s->init_buf->data;
1918                 p= &(d[4]);
1919
1920                 for (i=0; i < 4 && r[i] != NULL; i++)
1921                         {
1922 #ifndef OPENSSL_NO_SRP
1923                         if ((i == 2) && (type & SSL_kSRP))
1924                                 {
1925                                 *p = nr[i];
1926                                 p++;
1927                                 }
1928                         else
1929 #endif
1930                         s2n(nr[i],p);
1931                         BN_bn2bin(r[i],p);
1932                         p+=nr[i];
1933                         }
1934
1935 #ifndef OPENSSL_NO_ECDH
1936                 if (type & SSL_kEECDH)
1937                         {
1938                         /* XXX: For now, we only support named (not generic) curves.
1939                          * In this situation, the serverKeyExchange message has:
1940                          * [1 byte CurveType], [2 byte CurveName]
1941                          * [1 byte length of encoded point], followed by
1942                          * the actual encoded point itself
1943                          */
1944                         *p = NAMED_CURVE_TYPE;
1945                         p += 1;
1946                         *p = 0;
1947                         p += 1;
1948                         *p = curve_id;
1949                         p += 1;
1950                         *p = encodedlen;
1951                         p += 1;
1952                         memcpy((unsigned char*)p,
1953                             (unsigned char *)encodedPoint,
1954                             encodedlen);
1955                         OPENSSL_free(encodedPoint);
1956                         encodedPoint = NULL;
1957                         p += encodedlen;
1958                         }
1959 #endif
1960
1961 #ifndef OPENSSL_NO_PSK
1962                 if (type & SSL_kPSK)
1963                         {
1964                         /* copy PSK identity hint */
1965                         s2n(strlen(s->ctx->psk_identity_hint), p);
1966                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1967                         p+=strlen(s->ctx->psk_identity_hint);
1968                         }
1969 #endif
1970
1971                 /* not anonymous */
1972                 if (pkey != NULL)
1973                         {
1974                         /* n is the length of the params, they start at &(d[4])
1975                          * and p points to the space at the end. */
1976 #ifndef OPENSSL_NO_RSA
1977                         if (pkey->type == EVP_PKEY_RSA
1978                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1979                                 {
1980                                 q=md_buf;
1981                                 j=0;
1982                                 for (num=2; num > 0; num--)
1983                                         {
1984                                         EVP_MD_CTX_set_flags(&md_ctx,
1985                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1986                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1987                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1988                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1989                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1990                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1991                                         EVP_DigestFinal_ex(&md_ctx,q,
1992                                                 (unsigned int *)&i);
1993                                         q+=i;
1994                                         j+=i;
1995                                         }
1996                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1997                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1998                                         {
1999                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2000                                         goto err;
2001                                         }
2002                                 s2n(u,p);
2003                                 n+=u+2;
2004                                 }
2005                         else
2006 #endif
2007                         if (md)
2008                                 {
2009                                 /* For TLS1.2 and later send signature
2010                                  * algorithm */
2011                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2012                                         {
2013                                         if (!tls12_get_sigandhash(p, pkey, md))
2014                                                 {
2015                                                 /* Should never happen */
2016                                                 al=SSL_AD_INTERNAL_ERROR;
2017                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2018                                                 goto f_err;
2019                                                 }
2020                                         p+=2;
2021                                         }
2022 #ifdef SSL_DEBUG
2023                                 fprintf(stderr, "Using hash %s\n",
2024                                                         EVP_MD_name(md));
2025 #endif
2026                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2027                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2028                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2029                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
2030                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2031                                         (unsigned int *)&i,pkey))
2032                                         {
2033                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2034                                         goto err;
2035                                         }
2036                                 s2n(i,p);
2037                                 n+=i+2;
2038                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2039                                         n+= 2;
2040                                 }
2041                         else
2042                                 {
2043                                 /* Is this error check actually needed? */
2044                                 al=SSL_AD_HANDSHAKE_FAILURE;
2045                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2046                                 goto f_err;
2047                                 }
2048                         }
2049
2050                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2051                 l2n3(n,d);
2052
2053                 /* we should now have things packed up, so lets send
2054                  * it off */
2055                 s->init_num=n+4;
2056                 s->init_off=0;
2057                 }
2058
2059         s->state = SSL3_ST_SW_KEY_EXCH_B;
2060         EVP_MD_CTX_cleanup(&md_ctx);
2061         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2062 f_err:
2063         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2064 err:
2065 #ifndef OPENSSL_NO_ECDH
2066         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2067         BN_CTX_free(bn_ctx);
2068 #endif
2069         EVP_MD_CTX_cleanup(&md_ctx);
2070         return(-1);
2071         }
2072
2073 int ssl3_send_certificate_request(SSL *s)
2074         {
2075         unsigned char *p,*d;
2076         int i,j,nl,off,n;
2077         STACK_OF(X509_NAME) *sk=NULL;
2078         X509_NAME *name;
2079         BUF_MEM *buf;
2080
2081         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2082                 {
2083                 buf=s->init_buf;
2084
2085                 d=p=(unsigned char *)&(buf->data[4]);
2086
2087                 /* get the list of acceptable cert types */
2088                 p++;
2089                 n=ssl3_get_req_cert_type(s,p);
2090                 d[0]=n;
2091                 p+=n;
2092                 n++;
2093
2094                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2095                         {
2096                         nl = tls12_get_req_sig_algs(s, p + 2);
2097                         s2n(nl, p);
2098                         p += nl + 2;
2099                         n += nl + 2;
2100                         }
2101
2102                 off=n;
2103                 p+=2;
2104                 n+=2;
2105
2106                 sk=SSL_get_client_CA_list(s);
2107                 nl=0;
2108                 if (sk != NULL)
2109                         {
2110                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2111                                 {
2112                                 name=sk_X509_NAME_value(sk,i);
2113                                 j=i2d_X509_NAME(name,NULL);
2114                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2115                                         {
2116                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2117                                         goto err;
2118                                         }
2119                                 p=(unsigned char *)&(buf->data[4+n]);
2120                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2121                                         {
2122                                         s2n(j,p);
2123                                         i2d_X509_NAME(name,&p);
2124                                         n+=2+j;
2125                                         nl+=2+j;
2126                                         }
2127                                 else
2128                                         {
2129                                         d=p;
2130                                         i2d_X509_NAME(name,&p);
2131                                         j-=2; s2n(j,d); j+=2;
2132                                         n+=j;
2133                                         nl+=j;
2134                                         }
2135                                 }
2136                         }
2137                 /* else no CA names */
2138                 p=(unsigned char *)&(buf->data[4+off]);
2139                 s2n(nl,p);
2140
2141                 d=(unsigned char *)buf->data;
2142                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2143                 l2n3(n,d);
2144
2145                 /* we should now have things packed up, so lets send
2146                  * it off */
2147
2148                 s->init_num=n+4;
2149                 s->init_off=0;
2150 #ifdef NETSCAPE_HANG_BUG
2151                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2152                         {
2153                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2154                         goto err;
2155                         }
2156                 p=(unsigned char *)s->init_buf->data + s->init_num;
2157
2158                 /* do the header */
2159                 *(p++)=SSL3_MT_SERVER_DONE;
2160                 *(p++)=0;
2161                 *(p++)=0;
2162                 *(p++)=0;
2163                 s->init_num += 4;
2164 #endif
2165
2166                 s->state = SSL3_ST_SW_CERT_REQ_B;
2167                 }
2168
2169         /* SSL3_ST_SW_CERT_REQ_B */
2170         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2171 err:
2172         return(-1);
2173         }
2174
2175 int ssl3_get_client_key_exchange(SSL *s)
2176         {
2177         int i,al,ok;
2178         long n;
2179         unsigned long alg_k;
2180         unsigned char *p;
2181 #ifndef OPENSSL_NO_RSA
2182         RSA *rsa=NULL;
2183         EVP_PKEY *pkey=NULL;
2184 #endif
2185 #ifndef OPENSSL_NO_DH
2186         BIGNUM *pub=NULL;
2187         DH *dh_srvr;
2188 #endif
2189 #ifndef OPENSSL_NO_KRB5
2190         KSSL_ERR kssl_err;
2191 #endif /* OPENSSL_NO_KRB5 */
2192
2193 #ifndef OPENSSL_NO_ECDH
2194         EC_KEY *srvr_ecdh = NULL;
2195         EVP_PKEY *clnt_pub_pkey = NULL;
2196         EC_POINT *clnt_ecpoint = NULL;
2197         BN_CTX *bn_ctx = NULL;
2198 #endif
2199
2200         n=s->method->ssl_get_message(s,
2201                 SSL3_ST_SR_KEY_EXCH_A,
2202                 SSL3_ST_SR_KEY_EXCH_B,
2203                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2204                 2048, /* ??? */
2205                 &ok);
2206
2207         if (!ok) return((int)n);
2208         p=(unsigned char *)s->init_msg;
2209
2210         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2211
2212 #ifndef OPENSSL_NO_RSA
2213         if (alg_k & SSL_kRSA)
2214                 {
2215                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2216                 int decrypt_len;
2217                 unsigned char decrypt_good, version_good;
2218
2219                 /* FIX THIS UP EAY EAY EAY EAY */
2220                 if (s->s3->tmp.use_rsa_tmp)
2221                         {
2222                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2223                                 rsa=s->cert->rsa_tmp;
2224                         /* Don't do a callback because rsa_tmp should
2225                          * be sent already */
2226                         if (rsa == NULL)
2227                                 {
2228                                 al=SSL_AD_HANDSHAKE_FAILURE;
2229                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2230                                 goto f_err;
2231
2232                                 }
2233                         }
2234                 else
2235                         {
2236                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2237                         if (    (pkey == NULL) ||
2238                                 (pkey->type != EVP_PKEY_RSA) ||
2239                                 (pkey->pkey.rsa == NULL))
2240                                 {
2241                                 al=SSL_AD_HANDSHAKE_FAILURE;
2242                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2243                                 goto f_err;
2244                                 }
2245                         rsa=pkey->pkey.rsa;
2246                         }
2247
2248                 /* TLS and [incidentally] DTLS{0xFEFF} */
2249                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2250                         {
2251                         n2s(p,i);
2252                         if (n != i+2)
2253                                 {
2254                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2255                                         {
2256                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2257                                         goto err;
2258                                         }
2259                                 else
2260                                         p-=2;
2261                                 }
2262                         else
2263                                 n=i;
2264                         }
2265
2266                 /* We must not leak whether a decryption failure occurs because
2267                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2268                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2269                  * the TLS RFC and generates a random premaster secret for the
2270                  * case that the decrypt fails. See
2271                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2272
2273                 /* should be RAND_bytes, but we cannot work around a failure. */
2274                 if (RAND_pseudo_bytes(rand_premaster_secret,
2275                                       sizeof(rand_premaster_secret)) <= 0)
2276                         goto err;
2277                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2278                 ERR_clear_error();
2279
2280                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2281                  * decrypt_good will be 0xff if so and zero otherwise. */
2282                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2283
2284                 /* If the version in the decrypted pre-master secret is correct
2285                  * then version_good will be 0xff, otherwise it'll be zero.
2286                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2287                  * (http://eprint.iacr.org/2003/052/) exploits the version
2288                  * number check as a "bad version oracle". Thus version checks
2289                  * are done in constant time and are treated like any other
2290                  * decryption error. */
2291                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2292                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2293
2294                 /* The premaster secret must contain the same version number as
2295                  * the ClientHello to detect version rollback attacks
2296                  * (strangely, the protocol does not offer such protection for
2297                  * DH ciphersuites). However, buggy clients exist that send the
2298                  * negotiated protocol version instead if the server does not
2299                  * support the requested protocol version. If
2300                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2301                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2302                         {
2303                         unsigned char workaround_good;
2304                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2305                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2306                         version_good |= workaround_good;
2307                         }
2308
2309                 /* Both decryption and version must be good for decrypt_good
2310                  * to remain non-zero (0xff). */
2311                 decrypt_good &= version_good;
2312
2313                 /* Now copy rand_premaster_secret over p using
2314                  * decrypt_good_mask. */
2315                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2316                         {
2317                         p[i] = constant_time_select_8(decrypt_good, p[i],
2318                                                       rand_premaster_secret[i]);
2319                         }
2320
2321                 s->session->master_key_length=
2322                         s->method->ssl3_enc->generate_master_secret(s,
2323                                 s->session->master_key,
2324                                 p,i);
2325                 OPENSSL_cleanse(p,i);
2326                 }
2327         else
2328 #endif
2329 #ifndef OPENSSL_NO_DH
2330                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2331                 {
2332                 n2s(p,i);
2333                 if (n != i+2)
2334                         {
2335                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2336                                 {
2337                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2338                                 goto err;
2339                                 }
2340                         else
2341                                 {
2342                                 p-=2;
2343                                 i=(int)n;
2344                                 }
2345                         }
2346
2347                 if (n == 0L) /* the parameters are in the cert */
2348                         {
2349                         al=SSL_AD_HANDSHAKE_FAILURE;
2350                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2351                         goto f_err;
2352                         }
2353                 else
2354                         {
2355                         if (s->s3->tmp.dh == NULL)
2356                                 {
2357                                 al=SSL_AD_HANDSHAKE_FAILURE;
2358                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2359                                 goto f_err;
2360                                 }
2361                         else
2362                                 dh_srvr=s->s3->tmp.dh;
2363                         }
2364
2365                 pub=BN_bin2bn(p,i,NULL);
2366                 if (pub == NULL)
2367                         {
2368                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2369                         goto err;
2370                         }
2371
2372                 i=DH_compute_key(p,pub,dh_srvr);
2373
2374                 if (i <= 0)
2375                         {
2376                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2377                         BN_clear_free(pub);
2378                         goto err;
2379                         }
2380
2381                 DH_free(s->s3->tmp.dh);
2382                 s->s3->tmp.dh=NULL;
2383
2384                 BN_clear_free(pub);
2385                 pub=NULL;
2386                 s->session->master_key_length=
2387                         s->method->ssl3_enc->generate_master_secret(s,
2388                                 s->session->master_key,p,i);
2389                 OPENSSL_cleanse(p,i);
2390                 }
2391         else
2392 #endif
2393 #ifndef OPENSSL_NO_KRB5
2394         if (alg_k & SSL_kKRB5)
2395                 {
2396                 krb5_error_code         krb5rc;
2397                 krb5_data               enc_ticket;
2398                 krb5_data               authenticator;
2399                 krb5_data               enc_pms;
2400                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2401                 EVP_CIPHER_CTX          ciph_ctx;
2402                 const EVP_CIPHER        *enc = NULL;
2403                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2404                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2405                                                + EVP_MAX_BLOCK_LENGTH];
2406                 int                  padl, outl;
2407                 krb5_timestamp          authtime = 0;
2408                 krb5_ticket_times       ttimes;
2409
2410                 EVP_CIPHER_CTX_init(&ciph_ctx);
2411
2412                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2413
2414                 n2s(p,i);
2415                 enc_ticket.length = i;
2416
2417                 if (n < (long)(enc_ticket.length + 6))
2418                         {
2419                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2420                                 SSL_R_DATA_LENGTH_TOO_LONG);
2421                         goto err;
2422                         }
2423
2424                 enc_ticket.data = (char *)p;
2425                 p+=enc_ticket.length;
2426
2427                 n2s(p,i);
2428                 authenticator.length = i;
2429
2430                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2431                         {
2432                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2433                                 SSL_R_DATA_LENGTH_TOO_LONG);
2434                         goto err;
2435                         }
2436
2437                 authenticator.data = (char *)p;
2438                 p+=authenticator.length;
2439
2440                 n2s(p,i);
2441                 enc_pms.length = i;
2442                 enc_pms.data = (char *)p;
2443                 p+=enc_pms.length;
2444
2445                 /* Note that the length is checked again below,
2446                 ** after decryption
2447                 */
2448                 if(enc_pms.length > sizeof pms)
2449                         {
2450                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2451                                SSL_R_DATA_LENGTH_TOO_LONG);
2452                         goto err;
2453                         }
2454
2455                 if (n != (long)(enc_ticket.length + authenticator.length +
2456                                                 enc_pms.length + 6))
2457                         {
2458                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2459                                 SSL_R_DATA_LENGTH_TOO_LONG);
2460                         goto err;
2461                         }
2462
2463                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2464                                         &kssl_err)) != 0)
2465                         {
2466 #ifdef KSSL_DEBUG
2467                         printf("kssl_sget_tkt rtn %d [%d]\n",
2468                                 krb5rc, kssl_err.reason);
2469                         if (kssl_err.text)
2470                                 printf("kssl_err text= %s\n", kssl_err.text);
2471 #endif  /* KSSL_DEBUG */
2472                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2473                                 kssl_err.reason);
2474                         goto err;
2475                         }
2476
2477                 /*  Note: no authenticator is not considered an error,
2478                 **  but will return authtime == 0.
2479                 */
2480                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2481                                         &authtime, &kssl_err)) != 0)
2482                         {
2483 #ifdef KSSL_DEBUG
2484                         printf("kssl_check_authent rtn %d [%d]\n",
2485                                 krb5rc, kssl_err.reason);
2486                         if (kssl_err.text)
2487                                 printf("kssl_err text= %s\n", kssl_err.text);
2488 #endif  /* KSSL_DEBUG */
2489                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2490                                 kssl_err.reason);
2491                         goto err;
2492                         }
2493
2494                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2497                         goto err;
2498                         }
2499
2500 #ifdef KSSL_DEBUG
2501                 kssl_ctx_show(kssl_ctx);
2502 #endif  /* KSSL_DEBUG */
2503
2504                 enc = kssl_map_enc(kssl_ctx->enctype);
2505                 if (enc == NULL)
2506                     goto err;
2507
2508                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2509
2510                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2511                         {
2512                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2513                                 SSL_R_DECRYPTION_FAILED);
2514                         goto err;
2515                         }
2516                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2517                                         (unsigned char *)enc_pms.data, enc_pms.length))
2518                         {
2519                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2520                                 SSL_R_DECRYPTION_FAILED);
2521                         goto err;
2522                         }
2523                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2524                         {
2525                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2526                                 SSL_R_DATA_LENGTH_TOO_LONG);
2527                         goto err;
2528                         }
2529                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2530                         {
2531                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2532                                 SSL_R_DECRYPTION_FAILED);
2533                         goto err;
2534                         }
2535                 outl += padl;
2536                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2537                         {
2538                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2539                                 SSL_R_DATA_LENGTH_TOO_LONG);
2540                         goto err;
2541                         }
2542                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2543                     {
2544                     /* The premaster secret must contain the same version number as the
2545                      * ClientHello to detect version rollback attacks (strangely, the
2546                      * protocol does not offer such protection for DH ciphersuites).
2547                      * However, buggy clients exist that send random bytes instead of
2548                      * the protocol version.
2549                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2550                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2551                      */
2552                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2553                         {
2554                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2555                                SSL_AD_DECODE_ERROR);
2556                         goto err;
2557                         }
2558                     }
2559
2560                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2561
2562                 s->session->master_key_length=
2563                         s->method->ssl3_enc->generate_master_secret(s,
2564                                 s->session->master_key, pms, outl);
2565
2566                 if (kssl_ctx->client_princ)
2567                         {
2568                         size_t len = strlen(kssl_ctx->client_princ);
2569                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2570                                 {
2571                                 s->session->krb5_client_princ_len = len;
2572                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2573                                 }
2574                         }
2575
2576
2577                 /*  Was doing kssl_ctx_free() here,
2578                 **  but it caused problems for apache.
2579                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2580                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2581                 */
2582                 }
2583         else
2584 #endif  /* OPENSSL_NO_KRB5 */
2585
2586 #ifndef OPENSSL_NO_ECDH
2587                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2588                 {
2589                 int ret = 1;
2590                 int field_size = 0;
2591                 const EC_KEY   *tkey;
2592                 const EC_GROUP *group;
2593                 const BIGNUM *priv_key;
2594
2595                 /* initialize structures for server's ECDH key pair */
2596                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2597                         {
2598                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2599                             ERR_R_MALLOC_FAILURE);
2600                         goto err;
2601                         }
2602
2603                 /* Let's get server private key and group information */
2604                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2605                         {
2606                         /* use the certificate */
2607                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2608                         }
2609                 else
2610                         {
2611                         /* use the ephermeral values we saved when
2612                          * generating the ServerKeyExchange msg.
2613                          */
2614                         tkey = s->s3->tmp.ecdh;
2615                         }
2616
2617                 group    = EC_KEY_get0_group(tkey);
2618                 priv_key = EC_KEY_get0_private_key(tkey);
2619
2620                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2621                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2622                         {
2623                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2624                                ERR_R_EC_LIB);
2625                         goto err;
2626                         }
2627
2628                 /* Let's get client's public key */
2629                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2630                         {
2631                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2632                             ERR_R_MALLOC_FAILURE);
2633                         goto err;
2634                         }
2635
2636                 if (n == 0L)
2637                         {
2638                         /* Client Publickey was in Client Certificate */
2639
2640                          if (alg_k & SSL_kEECDH)
2641                                  {
2642                                  al=SSL_AD_HANDSHAKE_FAILURE;
2643                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2644                                  goto f_err;
2645                                  }
2646                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2647                             == NULL) ||
2648                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2649                                 {
2650                                 /* XXX: For now, we do not support client
2651                                  * authentication using ECDH certificates
2652                                  * so this branch (n == 0L) of the code is
2653                                  * never executed. When that support is
2654                                  * added, we ought to ensure the key
2655                                  * received in the certificate is
2656                                  * authorized for key agreement.
2657                                  * ECDH_compute_key implicitly checks that
2658                                  * the two ECDH shares are for the same
2659                                  * group.
2660                                  */
2661                                 al=SSL_AD_HANDSHAKE_FAILURE;
2662                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2663                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2664                                 goto f_err;
2665                                 }
2666
2667                         if (EC_POINT_copy(clnt_ecpoint,
2668                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2669                                 {
2670                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2671                                         ERR_R_EC_LIB);
2672                                 goto err;
2673                                 }
2674                         ret = 2; /* Skip certificate verify processing */
2675                         }
2676                 else
2677                         {
2678                         /* Get client's public key from encoded point
2679                          * in the ClientKeyExchange message.
2680                          */
2681                         if ((bn_ctx = BN_CTX_new()) == NULL)
2682                                 {
2683                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2684                                     ERR_R_MALLOC_FAILURE);
2685                                 goto err;
2686                                 }
2687
2688                         /* Get encoded point length */
2689                         i = *p;
2690                         p += 1;
2691                         if (n != 1 + i)
2692                                 {
2693                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2694                                     ERR_R_EC_LIB);
2695                                 goto err;
2696                                 }
2697                         if (EC_POINT_oct2point(group,
2698                             clnt_ecpoint, p, i, bn_ctx) == 0)
2699                                 {
2700                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2701                                     ERR_R_EC_LIB);
2702                                 goto err;
2703                                 }
2704                         /* p is pointing to somewhere in the buffer
2705                          * currently, so set it to the start
2706                          */
2707                         p=(unsigned char *)s->init_buf->data;
2708                         }
2709
2710                 /* Compute the shared pre-master secret */
2711                 field_size = EC_GROUP_get_degree(group);
2712                 if (field_size <= 0)
2713                         {
2714                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2715                                ERR_R_ECDH_LIB);
2716                         goto err;
2717                         }
2718                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2719                 if (i <= 0)
2720                         {
2721                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2722                             ERR_R_ECDH_LIB);
2723                         goto err;
2724                         }
2725
2726                 EVP_PKEY_free(clnt_pub_pkey);
2727                 EC_POINT_free(clnt_ecpoint);
2728                 EC_KEY_free(srvr_ecdh);
2729                 BN_CTX_free(bn_ctx);
2730                 EC_KEY_free(s->s3->tmp.ecdh);
2731                 s->s3->tmp.ecdh = NULL;
2732
2733                 /* Compute the master secret */
2734                 s->session->master_key_length = s->method->ssl3_enc-> \
2735                     generate_master_secret(s, s->session->master_key, p, i);
2736
2737                 OPENSSL_cleanse(p, i);
2738                 return (ret);
2739                 }
2740         else
2741 #endif
2742 #ifndef OPENSSL_NO_PSK
2743                 if (alg_k & SSL_kPSK)
2744                         {
2745                         unsigned char *t = NULL;
2746                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2747                         unsigned int pre_ms_len = 0, psk_len = 0;
2748                         int psk_err = 1;
2749                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2750
2751                         al=SSL_AD_HANDSHAKE_FAILURE;
2752
2753                         n2s(p,i);
2754                         if (n != i+2)
2755                                 {
2756                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2757                                         SSL_R_LENGTH_MISMATCH);
2758                                 goto psk_err;
2759                                 }
2760                         if (i > PSK_MAX_IDENTITY_LEN)
2761                                 {
2762                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2763                                         SSL_R_DATA_LENGTH_TOO_LONG);
2764                                 goto psk_err;
2765                                 }
2766                         if (s->psk_server_callback == NULL)
2767                                 {
2768                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2769                                        SSL_R_PSK_NO_SERVER_CB);
2770                                 goto psk_err;
2771                                 }
2772
2773                         /* Create guaranteed NULL-terminated identity
2774                          * string for the callback */
2775                         memcpy(tmp_id, p, i);
2776                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2777                         psk_len = s->psk_server_callback(s, tmp_id,
2778                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2779                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2780
2781                         if (psk_len > PSK_MAX_PSK_LEN)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2784                                         ERR_R_INTERNAL_ERROR);
2785                                 goto psk_err;
2786                                 }
2787                         else if (psk_len == 0)
2788                                 {
2789                                 /* PSK related to the given identity not found */
2790                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2791                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2792                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2793                                 goto psk_err;
2794                                 }
2795
2796                         /* create PSK pre_master_secret */
2797                         pre_ms_len=2+psk_len+2+psk_len;
2798                         t = psk_or_pre_ms;
2799                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2800                         s2n(psk_len, t);
2801                         memset(t, 0, psk_len);
2802                         t+=psk_len;
2803                         s2n(psk_len, t);
2804
2805                         if (s->session->psk_identity != NULL)
2806                                 OPENSSL_free(s->session->psk_identity);
2807                         s->session->psk_identity = BUF_strdup((char *)p);
2808                         if (s->session->psk_identity == NULL)
2809                                 {
2810                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2811                                         ERR_R_MALLOC_FAILURE);
2812                                 goto psk_err;
2813                                 }
2814
2815                         if (s->session->psk_identity_hint != NULL)
2816                                 OPENSSL_free(s->session->psk_identity_hint);
2817                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2818                         if (s->ctx->psk_identity_hint != NULL &&
2819                                 s->session->psk_identity_hint == NULL)
2820                                 {
2821                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2822                                         ERR_R_MALLOC_FAILURE);
2823                                 goto psk_err;
2824                                 }
2825
2826                         s->session->master_key_length=
2827                                 s->method->ssl3_enc->generate_master_secret(s,
2828                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2829                         psk_err = 0;
2830                 psk_err:
2831                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2832                         if (psk_err != 0)
2833                                 goto f_err;
2834                         }
2835                 else
2836 #endif
2837 #ifndef OPENSSL_NO_SRP
2838                 if (alg_k & SSL_kSRP)
2839                         {
2840                         int param_len;
2841
2842                         n2s(p,i);
2843                         param_len=i+2;
2844                         if (param_len > n)
2845                                 {
2846                                 al=SSL_AD_DECODE_ERROR;
2847                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2848                                 goto f_err;
2849                                 }
2850                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2851                                 {
2852                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2853                                 goto err;
2854                                 }
2855                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2856                                 || BN_is_zero(s->srp_ctx.A))
2857                                 {
2858                                 al=SSL_AD_ILLEGAL_PARAMETER;
2859                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2860                                 goto f_err;
2861                                 }
2862                         if (s->session->srp_username != NULL)
2863                                 OPENSSL_free(s->session->srp_username);
2864                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2865                         if (s->session->srp_username == NULL)
2866                                 {
2867                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2868                                         ERR_R_MALLOC_FAILURE);
2869                                 goto err;
2870                                 }
2871
2872                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2873                                 {
2874                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2875                                 goto err;
2876                                 }
2877
2878                         p+=i;
2879                         }
2880                 else
2881 #endif  /* OPENSSL_NO_SRP */
2882                 if (alg_k & SSL_kGOST)
2883                         {
2884                         int ret = 0;
2885                         EVP_PKEY_CTX *pkey_ctx;
2886                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2887                         unsigned char premaster_secret[32], *start;
2888                         size_t outlen=32, inlen;
2889                         unsigned long alg_a;
2890                         int Ttag, Tclass;
2891                         long Tlen;
2892
2893                         /* Get our certificate private key*/
2894                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2895                         if (alg_a & SSL_aGOST94)
2896                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2897                         else if (alg_a & SSL_aGOST01)
2898                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2899
2900                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2901                         EVP_PKEY_decrypt_init(pkey_ctx);
2902                         /* If client certificate is present and is of the same type, maybe
2903                          * use it for key exchange.  Don't mind errors from
2904                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2905                          * a client certificate for authorization only. */
2906                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2907                         if (client_pub_pkey)
2908                                 {
2909                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2910                                         ERR_clear_error();
2911                                 }
2912                         /* Decrypt session key */
2913                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2914                                 Ttag != V_ASN1_SEQUENCE ||
2915                                 Tclass != V_ASN1_UNIVERSAL)
2916                                 {
2917                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2918                                 goto gerr;
2919                                 }
2920                         start = p;
2921                         inlen = Tlen;
2922                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2923
2924                                 {
2925                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2926                                 goto gerr;
2927                                 }
2928                         /* Generate master secret */
2929                         s->session->master_key_length=
2930                                 s->method->ssl3_enc->generate_master_secret(s,
2931                                         s->session->master_key,premaster_secret,32);
2932                         /* Check if pubkey from client certificate was used */
2933                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2934                                 ret = 2;
2935                         else
2936                                 ret = 1;
2937                 gerr:
2938                         EVP_PKEY_free(client_pub_pkey);
2939                         EVP_PKEY_CTX_free(pkey_ctx);
2940                         if (ret)
2941                                 return ret;
2942                         else
2943                                 goto err;
2944                         }
2945                 else
2946                 {
2947                 al=SSL_AD_HANDSHAKE_FAILURE;
2948                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2949                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2950                 goto f_err;
2951                 }
2952
2953         return(1);
2954 f_err:
2955         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2956 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2957 err:
2958 #endif
2959 #ifndef OPENSSL_NO_ECDH
2960         EVP_PKEY_free(clnt_pub_pkey);
2961         EC_POINT_free(clnt_ecpoint);
2962         if (srvr_ecdh != NULL)
2963                 EC_KEY_free(srvr_ecdh);
2964         BN_CTX_free(bn_ctx);
2965 #endif
2966         return(-1);
2967         }
2968
2969 int ssl3_get_cert_verify(SSL *s)
2970         {
2971         EVP_PKEY *pkey=NULL;
2972         unsigned char *p;
2973         int al,ok,ret=0;
2974         long n;
2975         int type=0,i,j;
2976         X509 *peer;
2977         const EVP_MD *md = NULL;
2978         EVP_MD_CTX mctx;
2979         EVP_MD_CTX_init(&mctx);
2980
2981         n=s->method->ssl_get_message(s,
2982                 SSL3_ST_SR_CERT_VRFY_A,
2983                 SSL3_ST_SR_CERT_VRFY_B,
2984                 -1,
2985                 SSL3_RT_MAX_PLAIN_LENGTH,
2986                 &ok);
2987
2988         if (!ok) return((int)n);
2989
2990         if (s->session->peer != NULL)
2991                 {
2992                 peer=s->session->peer;
2993                 pkey=X509_get_pubkey(peer);
2994                 type=X509_certificate_type(peer,pkey);
2995                 }
2996         else
2997                 {
2998                 peer=NULL;
2999                 pkey=NULL;
3000                 }
3001
3002         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3003                 {
3004                 s->s3->tmp.reuse_message=1;
3005                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3006                         {
3007                         al=SSL_AD_UNEXPECTED_MESSAGE;
3008                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3009                         goto f_err;
3010                         }
3011                 ret=1;
3012                 goto end;
3013                 }
3014
3015         if (peer == NULL)
3016                 {
3017                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3018                 al=SSL_AD_UNEXPECTED_MESSAGE;
3019                 goto f_err;
3020                 }
3021
3022         if (!(type & EVP_PKT_SIGN))
3023                 {
3024                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3025                 al=SSL_AD_ILLEGAL_PARAMETER;
3026                 goto f_err;
3027                 }
3028
3029         if (s->s3->change_cipher_spec)
3030                 {
3031                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3032                 al=SSL_AD_UNEXPECTED_MESSAGE;
3033                 goto f_err;
3034                 }
3035
3036         /* we now have a signature that we need to verify */
3037         p=(unsigned char *)s->init_msg;
3038         /* Check for broken implementations of GOST ciphersuites */
3039         /* If key is GOST and n is exactly 64, it is bare
3040          * signature without length field */
3041         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3042                 pkey->type == NID_id_GostR3410_2001) )
3043                 {
3044                 i=64;
3045                 }
3046         else
3047                 {
3048                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3049                         {
3050                         int sigalg = tls12_get_sigid(pkey);
3051                         /* Should never happen */
3052                         if (sigalg == -1)
3053                                 {
3054                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3055                                 al=SSL_AD_INTERNAL_ERROR;
3056                                 goto f_err;
3057                                 }
3058                         /* Check key type is consistent with signature */
3059                         if (sigalg != (int)p[1])
3060                                 {
3061                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3062                                 al=SSL_AD_DECODE_ERROR;
3063                                 goto f_err;
3064                                 }
3065                         md = tls12_get_hash(p[0]);
3066                         if (md == NULL)
3067                                 {
3068                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3069                                 al=SSL_AD_DECODE_ERROR;
3070                                 goto f_err;
3071                                 }
3072 #ifdef SSL_DEBUG
3073 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3074 #endif
3075                         p += 2;
3076                         n -= 2;
3077                         }
3078                 n2s(p,i);
3079                 n-=2;
3080                 if (i > n)
3081                         {
3082                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3083                         al=SSL_AD_DECODE_ERROR;
3084                         goto f_err;
3085                         }
3086         }
3087         j=EVP_PKEY_size(pkey);
3088         if ((i > j) || (n > j) || (n <= 0))
3089                 {
3090                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3091                 al=SSL_AD_DECODE_ERROR;
3092                 goto f_err;
3093                 }
3094
3095         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3096                 {
3097                 long hdatalen = 0;
3098                 void *hdata;
3099                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3100                 if (hdatalen <= 0)
3101                         {
3102                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3103                         al=SSL_AD_INTERNAL_ERROR;
3104                         goto f_err;
3105                         }
3106 #ifdef SSL_DEBUG
3107                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3108                                                         EVP_MD_name(md));
3109 #endif
3110                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3111                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3112                         {
3113                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3114                         al=SSL_AD_INTERNAL_ERROR;
3115                         goto f_err;
3116                         }
3117
3118                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3119                         {
3120                         al=SSL_AD_DECRYPT_ERROR;
3121                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3122                         goto f_err;
3123                         }
3124                 }
3125         else
3126 #ifndef OPENSSL_NO_RSA
3127         if (pkey->type == EVP_PKEY_RSA)
3128                 {
3129                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3130                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3131                                                         pkey->pkey.rsa);
3132                 if (i < 0)
3133                         {
3134                         al=SSL_AD_DECRYPT_ERROR;
3135                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3136                         goto f_err;
3137                         }
3138                 if (i == 0)
3139                         {
3140                         al=SSL_AD_DECRYPT_ERROR;
3141                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3142                         goto f_err;
3143                         }
3144                 }
3145         else
3146 #endif
3147 #ifndef OPENSSL_NO_DSA
3148                 if (pkey->type == EVP_PKEY_DSA)
3149                 {
3150                 j=DSA_verify(pkey->save_type,
3151                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3152                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3153                 if (j <= 0)
3154                         {
3155                         /* bad signature */
3156                         al=SSL_AD_DECRYPT_ERROR;
3157                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3158                         goto f_err;
3159                         }
3160                 }
3161         else
3162 #endif
3163 #ifndef OPENSSL_NO_ECDSA
3164                 if (pkey->type == EVP_PKEY_EC)
3165                 {
3166                 j=ECDSA_verify(pkey->save_type,
3167                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3168                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3169                 if (j <= 0)
3170                         {
3171                         /* bad signature */
3172                         al=SSL_AD_DECRYPT_ERROR;
3173                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3174                             SSL_R_BAD_ECDSA_SIGNATURE);
3175                         goto f_err;
3176                         }
3177                 }
3178         else
3179 #endif
3180         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3181                 {   unsigned char signature[64];
3182                         int idx;
3183                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3184                         EVP_PKEY_verify_init(pctx);
3185                         if (i!=64) {
3186                                 fprintf(stderr,"GOST signature length is %d",i);
3187                         }
3188                         for (idx=0;idx<64;idx++) {
3189                                 signature[63-idx]=p[idx];
3190                         }
3191                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3192                         EVP_PKEY_CTX_free(pctx);
3193                         if (j<=0)
3194                                 {
3195                                 al=SSL_AD_DECRYPT_ERROR;
3196                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3197                                         SSL_R_BAD_ECDSA_SIGNATURE);
3198                                 goto f_err;
3199                                 }
3200                 }
3201         else
3202                 {
3203                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3204                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3205                 goto f_err;
3206                 }
3207
3208
3209         ret=1;
3210         if (0)
3211                 {
3212 f_err:
3213                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3214                 }
3215 end:
3216         if (s->s3->handshake_buffer)
3217                 {
3218                 BIO_free(s->s3->handshake_buffer);
3219                 s->s3->handshake_buffer = NULL;
3220                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3221                 }
3222         EVP_MD_CTX_cleanup(&mctx);
3223         EVP_PKEY_free(pkey);
3224         return(ret);
3225         }
3226
3227 int ssl3_get_client_certificate(SSL *s)
3228         {
3229         int i,ok,al,ret= -1;
3230         X509 *x=NULL;
3231         unsigned long l,nc,llen,n;
3232         const unsigned char *p,*q;
3233         unsigned char *d;
3234         STACK_OF(X509) *sk=NULL;
3235
3236         n=s->method->ssl_get_message(s,
3237                 SSL3_ST_SR_CERT_A,
3238                 SSL3_ST_SR_CERT_B,
3239                 -1,
3240                 s->max_cert_list,
3241                 &ok);
3242
3243         if (!ok) return((int)n);
3244
3245         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3246                 {
3247                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3248                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3249                         {
3250                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3251                         al=SSL_AD_HANDSHAKE_FAILURE;
3252                         goto f_err;
3253                         }
3254                 /* If tls asked for a client cert, the client must return a 0 list */
3255                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3256                         {
3257                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3258                         al=SSL_AD_UNEXPECTED_MESSAGE;
3259                         goto f_err;
3260                         }
3261                 s->s3->tmp.reuse_message=1;
3262                 return(1);
3263                 }
3264
3265         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3266                 {
3267                 al=SSL_AD_UNEXPECTED_MESSAGE;
3268                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3269                 goto f_err;
3270                 }
3271         p=d=(unsigned char *)s->init_msg;
3272
3273         if ((sk=sk_X509_new_null()) == NULL)
3274                 {
3275                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3276                 goto err;
3277                 }
3278
3279         n2l3(p,llen);
3280         if (llen+3 != n)
3281                 {
3282                 al=SSL_AD_DECODE_ERROR;
3283                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3284                 goto f_err;
3285                 }
3286         for (nc=0; nc<llen; )
3287                 {
3288                 n2l3(p,l);
3289                 if ((l+nc+3) > llen)
3290                         {
3291                         al=SSL_AD_DECODE_ERROR;
3292                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3293                         goto f_err;
3294                         }
3295
3296                 q=p;
3297                 x=d2i_X509(NULL,&p,l);
3298                 if (x == NULL)
3299                         {
3300                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3301                         goto err;
3302                         }
3303                 if (p != (q+l))
3304                         {
3305                         al=SSL_AD_DECODE_ERROR;
3306                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3307                         goto f_err;
3308                         }
3309                 if (!sk_X509_push(sk,x))
3310                         {
3311                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3312                         goto err;
3313                         }
3314                 x=NULL;
3315                 nc+=l+3;
3316                 }
3317
3318         if (sk_X509_num(sk) <= 0)
3319                 {
3320                 /* TLS does not mind 0 certs returned */
3321                 if (s->version == SSL3_VERSION)
3322                         {
3323                         al=SSL_AD_HANDSHAKE_FAILURE;
3324                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3325                         goto f_err;
3326                         }
3327                 /* Fail for TLS only if we required a certificate */
3328                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3329                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3330                         {
3331                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3332                         al=SSL_AD_HANDSHAKE_FAILURE;
3333                         goto f_err;
3334                         }
3335                 /* No client certificate so digest cached records */
3336                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3337                         {
3338                         al=SSL_AD_INTERNAL_ERROR;
3339                         goto f_err;
3340                         }
3341                 }
3342         else
3343                 {
3344                 i=ssl_verify_cert_chain(s,sk);
3345                 if (i <= 0)
3346                         {
3347                         al=ssl_verify_alarm_type(s->verify_result);
3348                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3349                         goto f_err;
3350                         }
3351                 }
3352
3353         if (s->session->peer != NULL) /* This should not be needed */
3354                 X509_free(s->session->peer);
3355         s->session->peer=sk_X509_shift(sk);
3356         s->session->verify_result = s->verify_result;
3357
3358         /* With the current implementation, sess_cert will always be NULL
3359          * when we arrive here. */
3360         if (s->session->sess_cert == NULL)
3361                 {
3362                 s->session->sess_cert = ssl_sess_cert_new();
3363                 if (s->session->sess_cert == NULL)
3364                         {
3365                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3366                         goto err;
3367                         }
3368                 }
3369         if (s->session->sess_cert->cert_chain != NULL)
3370                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3371         s->session->sess_cert->cert_chain=sk;
3372         /* Inconsistency alert: cert_chain does *not* include the
3373          * peer's own certificate, while we do include it in s3_clnt.c */
3374
3375         sk=NULL;
3376
3377         ret=1;
3378         if (0)
3379                 {
3380 f_err:
3381                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3382                 }
3383 err:
3384         if (x != NULL) X509_free(x);
3385         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3386         return(ret);
3387         }
3388
3389 int ssl3_send_server_certificate(SSL *s)
3390         {
3391         unsigned long l;
3392         X509 *x;
3393
3394         if (s->state == SSL3_ST_SW_CERT_A)
3395                 {
3396                 x=ssl_get_server_send_cert(s);
3397                 if (x == NULL)
3398                         {
3399                         /* VRS: allow null cert if auth == KRB5 */
3400                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3401                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3402                                 {
3403                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3404                                 return(0);
3405                                 }
3406                         }
3407
3408                 l=ssl3_output_cert_chain(s,x);
3409                 if (!l)
3410                         {
3411                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3412                         return(0);
3413                         }
3414                 s->state=SSL3_ST_SW_CERT_B;
3415                 s->init_num=(int)l;
3416                 s->init_off=0;
3417                 }
3418
3419         /* SSL3_ST_SW_CERT_B */
3420         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3421         }
3422
3423 #ifndef OPENSSL_NO_TLSEXT
3424 /* send a new session ticket (not necessarily for a new session) */
3425 int ssl3_send_newsession_ticket(SSL *s)
3426         {
3427         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3428                 {
3429                 unsigned char *p, *senc, *macstart;
3430                 const unsigned char *const_p;
3431                 int len, slen_full, slen;
3432                 SSL_SESSION *sess;
3433                 unsigned int hlen;
3434                 EVP_CIPHER_CTX ctx;
3435                 HMAC_CTX hctx;
3436                 SSL_CTX *tctx = s->initial_ctx;
3437                 unsigned char iv[EVP_MAX_IV_LENGTH];
3438                 unsigned char key_name[16];
3439
3440                 /* get session encoding length */
3441                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3442                 /* Some length values are 16 bits, so forget it if session is
3443                  * too long
3444                  */
3445                 if (slen_full > 0xFF00)
3446                         return -1;
3447                 senc = OPENSSL_malloc(slen_full);
3448                 if (!senc)
3449                         return -1;
3450                 p = senc;
3451                 i2d_SSL_SESSION(s->session, &p);
3452
3453                 /* create a fresh copy (not shared with other threads) to clean up */
3454                 const_p = senc;
3455                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3456                 if (sess == NULL)
3457                         {
3458                         OPENSSL_free(senc);
3459                         return -1;
3460                         }
3461                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3462
3463                 slen = i2d_SSL_SESSION(sess, NULL);
3464                 if (slen > slen_full) /* shouldn't ever happen */
3465                         {
3466                         OPENSSL_free(senc);
3467                         return -1;
3468                         }
3469                 p = senc;
3470                 i2d_SSL_SESSION(sess, &p);
3471                 SSL_SESSION_free(sess);
3472
3473                 /* Grow buffer if need be: the length calculation is as
3474                  * follows 1 (size of message name) + 3 (message length
3475                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3476                  * 16 (key name) + max_iv_len (iv length) +
3477                  * session_length + max_enc_block_size (max encrypted session
3478                  * length) + max_md_size (HMAC).
3479                  */
3480                 if (!BUF_MEM_grow(s->init_buf,
3481                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3482                         EVP_MAX_MD_SIZE + slen))
3483                         return -1;
3484
3485                 p=(unsigned char *)s->init_buf->data;
3486                 /* do the header */
3487                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3488                 /* Skip message length for now */
3489                 p += 3;
3490                 EVP_CIPHER_CTX_init(&ctx);
3491                 HMAC_CTX_init(&hctx);
3492                 /* Initialize HMAC and cipher contexts. If callback present
3493                  * it does all the work otherwise use generated values
3494                  * from parent ctx.
3495                  */
3496                 if (tctx->tlsext_ticket_key_cb)
3497                         {
3498                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3499                                                          &hctx, 1) < 0)
3500                                 {
3501                                 OPENSSL_free(senc);
3502                                 return -1;
3503                                 }
3504                         }
3505                 else
3506                         {
3507                         RAND_pseudo_bytes(iv, 16);
3508                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3509                                         tctx->tlsext_tick_aes_key, iv);
3510                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3511                                         tlsext_tick_md(), NULL);
3512                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3513                         }
3514
3515                 /* Ticket lifetime hint (advisory only):
3516                  * We leave this unspecified for resumed session (for simplicity),
3517                  * and guess that tickets for new sessions will live as long
3518                  * as their sessions. */
3519                 l2n(s->hit ? 0 : s->session->timeout, p);
3520
3521                 /* Skip ticket length for now */
3522                 p += 2;
3523                 /* Output key name */
3524                 macstart = p;
3525                 memcpy(p, key_name, 16);
3526                 p += 16;
3527                 /* output IV */
3528                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3529                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3530                 /* Encrypt session data */
3531                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3532                 p += len;
3533                 EVP_EncryptFinal(&ctx, p, &len);
3534                 p += len;
3535                 EVP_CIPHER_CTX_cleanup(&ctx);
3536
3537                 HMAC_Update(&hctx, macstart, p - macstart);
3538                 HMAC_Final(&hctx, p, &hlen);
3539                 HMAC_CTX_cleanup(&hctx);
3540
3541                 p += hlen;
3542                 /* Now write out lengths: p points to end of data written */
3543                 /* Total length */
3544                 len = p - (unsigned char *)s->init_buf->data;
3545                 p=(unsigned char *)s->init_buf->data + 1;
3546                 l2n3(len - 4, p); /* Message length */
3547                 p += 4;
3548                 s2n(len - 10, p);  /* Ticket length */
3549
3550                 /* number of bytes to write */
3551                 s->init_num= len;
3552                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3553                 s->init_off=0;
3554                 OPENSSL_free(senc);
3555                 }
3556
3557         /* SSL3_ST_SW_SESSION_TICKET_B */
3558         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3559         }
3560
3561 int ssl3_send_cert_status(SSL *s)
3562         {
3563         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3564                 {
3565                 unsigned char *p;
3566                 /* Grow buffer if need be: the length calculation is as
3567                  * follows 1 (message type) + 3 (message length) +
3568                  * 1 (ocsp response type) + 3 (ocsp response length)
3569                  * + (ocsp response)
3570                  */
3571                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3572                         return -1;
3573
3574                 p=(unsigned char *)s->init_buf->data;
3575
3576                 /* do the header */
3577                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3578                 /* message length */
3579                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3580                 /* status type */
3581                 *(p++)= s->tlsext_status_type;
3582                 /* length of OCSP response */
3583                 l2n3(s->tlsext_ocsp_resplen, p);
3584                 /* actual response */
3585                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3586                 /* number of bytes to write */
3587                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3588                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3589                 s->init_off = 0;
3590                 }
3591
3592         /* SSL3_ST_SW_CERT_STATUS_B */
3593         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3594         }
3595
3596 # ifndef OPENSSL_NO_NEXTPROTONEG
3597 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3598  * sets the next_proto member in s if found */
3599 int ssl3_get_next_proto(SSL *s)
3600         {
3601         int ok;
3602         int proto_len, padding_len;
3603         long n;
3604         const unsigned char *p;
3605
3606         /* Clients cannot send a NextProtocol message if we didn't see the
3607          * extension in their ClientHello */
3608         if (!s->s3->next_proto_neg_seen)
3609                 {
3610                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3611                 return -1;
3612                 }
3613
3614         n=s->method->ssl_get_message(s,
3615                 SSL3_ST_SR_NEXT_PROTO_A,
3616                 SSL3_ST_SR_NEXT_PROTO_B,
3617                 SSL3_MT_NEXT_PROTO,
3618                 514,  /* See the payload format below */
3619                 &ok);
3620
3621         if (!ok)
3622                 return((int)n);
3623
3624         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3625          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3626          * by ssl3_get_finished). */
3627         if (!s->s3->change_cipher_spec)
3628                 {
3629                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3630                 return -1;
3631                 }
3632
3633         if (n < 2)
3634                 return 0;  /* The body must be > 1 bytes long */
3635
3636         p=(unsigned char *)s->init_msg;
3637
3638         /* The payload looks like:
3639          *   uint8 proto_len;
3640          *   uint8 proto[proto_len];
3641          *   uint8 padding_len;
3642          *   uint8 padding[padding_len];
3643          */
3644         proto_len = p[0];
3645         if (proto_len + 2 > s->init_num)
3646                 return 0;
3647         padding_len = p[proto_len + 1];
3648         if (proto_len + padding_len + 2 != s->init_num)
3649                 return 0;
3650
3651         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3652         if (!s->next_proto_negotiated)
3653                 {
3654                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3655                 return 0;
3656                 }
3657         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3658         s->next_proto_negotiated_len = proto_len;
3659
3660         return 1;
3661         }
3662 # endif
3663 #endif