crypto/openssl/ssl/t1_lib.c

   1 /* ssl/t1_lib.c */
   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 #include <stdio.h>
 113 #include <openssl/objects.h>
 114 #include <openssl/evp.h>
 115 #include <openssl/hmac.h>
 116 #include <openssl/ocsp.h>
 117 #include "ssl_locl.h"
 118
 119 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 120
 121 #ifndef OPENSSL_NO_TLSEXT
 122 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 123                                 const unsigned char *sess_id, int sesslen,
 124                                 SSL_SESSION **psess);
 125 #endif
 126
 127 SSL3_ENC_METHOD TLSv1_enc_data={
 128         tls1_enc,
 129         tls1_mac,
 130         tls1_setup_key_block,
 131         tls1_generate_master_secret,
 132         tls1_change_cipher_state,
 133         tls1_final_finish_mac,
 134         TLS1_FINISH_MAC_LENGTH,
 135         tls1_cert_verify_mac,
 136         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 137         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 138         tls1_alert_code,
 139         };
 140
 141 long tls1_default_timeout(void)
 142         {
 143         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 144          * is way too long for http, the cache would over fill */
 145         return(60*60*2);
 146         }
 147
 148 int tls1_new(SSL *s)
 149         {
 150         if (!ssl3_new(s)) return(0);
 151         s->method->ssl_clear(s);
 152         return(1);
 153         }
 154
 155 void tls1_free(SSL *s)
 156         {
 157 #ifndef OPENSSL_NO_TLSEXT
 158         if (s->tlsext_session_ticket)
 159                 {
 160                 OPENSSL_free(s->tlsext_session_ticket);
 161                 }
 162 #endif /* OPENSSL_NO_TLSEXT */
 163         ssl3_free(s);
 164         }
 165
 166 void tls1_clear(SSL *s)
 167         {
 168         ssl3_clear(s);
 169         s->version=TLS1_VERSION;
 170         }
 171
 172 #ifndef OPENSSL_NO_EC
 173 static int nid_list[] =
 174         {
 175                 NID_sect163k1, /* sect163k1 (1) */
 176                 NID_sect163r1, /* sect163r1 (2) */
 177                 NID_sect163r2, /* sect163r2 (3) */
 178                 NID_sect193r1, /* sect193r1 (4) */
 179                 NID_sect193r2, /* sect193r2 (5) */
 180                 NID_sect233k1, /* sect233k1 (6) */
 181                 NID_sect233r1, /* sect233r1 (7) */
 182                 NID_sect239k1, /* sect239k1 (8) */
 183                 NID_sect283k1, /* sect283k1 (9) */
 184                 NID_sect283r1, /* sect283r1 (10) */
 185                 NID_sect409k1, /* sect409k1 (11) */
 186                 NID_sect409r1, /* sect409r1 (12) */
 187                 NID_sect571k1, /* sect571k1 (13) */
 188                 NID_sect571r1, /* sect571r1 (14) */
 189                 NID_secp160k1, /* secp160k1 (15) */
 190                 NID_secp160r1, /* secp160r1 (16) */
 191                 NID_secp160r2, /* secp160r2 (17) */
 192                 NID_secp192k1, /* secp192k1 (18) */
 193                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 194                 NID_secp224k1, /* secp224k1 (20) */
 195                 NID_secp224r1, /* secp224r1 (21) */
 196                 NID_secp256k1, /* secp256k1 (22) */
 197                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 198                 NID_secp384r1, /* secp384r1 (24) */
 199                 NID_secp521r1  /* secp521r1 (25) */
 200         };
 201
 202 int tls1_ec_curve_id2nid(int curve_id)
 203         {
 204         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 205         if ((curve_id < 1) || ((unsigned int)curve_id >
 206                                 sizeof(nid_list)/sizeof(nid_list[0])))
 207                 return 0;
 208         return nid_list[curve_id-1];
 209         }
 210
 211 int tls1_ec_nid2curve_id(int nid)
 212         {
 213         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 214         switch (nid)
 215                 {
 216         case NID_sect163k1: /* sect163k1 (1) */
 217                 return 1;
 218         case NID_sect163r1: /* sect163r1 (2) */
 219                 return 2;
 220         case NID_sect163r2: /* sect163r2 (3) */
 221                 return 3;
 222         case NID_sect193r1: /* sect193r1 (4) */
 223                 return 4;
 224         case NID_sect193r2: /* sect193r2 (5) */
 225                 return 5;
 226         case NID_sect233k1: /* sect233k1 (6) */
 227                 return 6;
 228         case NID_sect233r1: /* sect233r1 (7) */
 229                 return 7;
 230         case NID_sect239k1: /* sect239k1 (8) */
 231                 return 8;
 232         case NID_sect283k1: /* sect283k1 (9) */
 233                 return 9;
 234         case NID_sect283r1: /* sect283r1 (10) */
 235                 return 10;
 236         case NID_sect409k1: /* sect409k1 (11) */
 237                 return 11;
 238         case NID_sect409r1: /* sect409r1 (12) */
 239                 return 12;
 240         case NID_sect571k1: /* sect571k1 (13) */
 241                 return 13;
 242         case NID_sect571r1: /* sect571r1 (14) */
 243                 return 14;
 244         case NID_secp160k1: /* secp160k1 (15) */
 245                 return 15;
 246         case NID_secp160r1: /* secp160r1 (16) */
 247                 return 16;
 248         case NID_secp160r2: /* secp160r2 (17) */
 249                 return 17;
 250         case NID_secp192k1: /* secp192k1 (18) */
 251                 return 18;
 252         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 253                 return 19;
 254         case NID_secp224k1: /* secp224k1 (20) */
 255                 return 20;
 256         case NID_secp224r1: /* secp224r1 (21) */
 257                 return 21;
 258         case NID_secp256k1: /* secp256k1 (22) */
 259                 return 22;
 260         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 261                 return 23;
 262         case NID_secp384r1: /* secp384r1 (24) */
 263                 return 24;
 264         case NID_secp521r1:  /* secp521r1 (25) */
 265                 return 25;
 266         default:
 267                 return 0;
 268                 }
 269         }
 270 #endif /* OPENSSL_NO_EC */
 271
 272 #ifndef OPENSSL_NO_TLSEXT
 273 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 274         {
 275         int extdatalen=0;
 276         unsigned char *ret = p;
 277
 278         /* don't add extensions for SSLv3 unless doing secure renegotiation */
 279         if (s->client_version == SSL3_VERSION
 280                                         && !s->s3->send_connection_binding)
 281                 return p;
 282
 283         ret+=2;
 284
 285         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 286
 287         if (s->tlsext_hostname != NULL)
 288                 {
 289                 /* Add TLS extension servername to the Client Hello message */
 290                 unsigned long size_str;
 291                 long lenmax;
 292
 293                 /* check for enough space.
 294                    4 for the servername type and entension length
 295                    2 for servernamelist length
 296                    1 for the hostname type
 297                    2 for hostname length
 298                    + hostname length
 299                 */
 300
 301                 if ((lenmax = limit - ret - 9) < 0
 302                     || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
 303                         return NULL;
 304
 305                 /* extension type and length */
 306                 s2n(TLSEXT_TYPE_server_name,ret);
 307                 s2n(size_str+5,ret);
 308
 309                 /* length of servername list */
 310                 s2n(size_str+3,ret);
 311
 312                 /* hostname type, length and hostname */
 313                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 314                 s2n(size_str,ret);
 315                 memcpy(ret, s->tlsext_hostname, size_str);
 316                 ret+=size_str;
 317                 }
 318
 319         /* Add RI if renegotiating */
 320         if (s->new_session)
 321           {
 322           int el;
 323
 324           if(!ssl_add_clienthello_renegotiate_ext(s, 0, &el, 0))
 325               {
 326               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 327               return NULL;
 328               }
 329
 330           if((limit - p - 4 - el) < 0) return NULL;
 331
 332           s2n(TLSEXT_TYPE_renegotiate,ret);
 333           s2n(el,ret);
 334
 335           if(!ssl_add_clienthello_renegotiate_ext(s, ret, &el, el))
 336               {
 337               SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 338               return NULL;
 339               }
 340
 341           ret += el;
 342         }
 343
 344 #ifndef OPENSSL_NO_EC
 345         if (s->tlsext_ecpointformatlist != NULL &&
 346             s->version != DTLS1_VERSION)
 347                 {
 348                 /* Add TLS extension ECPointFormats to the ClientHello message */
 349                 long lenmax;
 350
 351                 if ((lenmax = limit - ret - 5) < 0) return NULL;
 352                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 353                 if (s->tlsext_ecpointformatlist_length > 255)
 354                         {
 355                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 356                         return NULL;
 357                         }
 358
 359                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 360                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 361                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 362                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 363                 ret+=s->tlsext_ecpointformatlist_length;
 364                 }
 365         if (s->tlsext_ellipticcurvelist != NULL &&
 366             s->version != DTLS1_VERSION)
 367                 {
 368                 /* Add TLS extension EllipticCurves to the ClientHello message */
 369                 long lenmax;
 370
 371                 if ((lenmax = limit - ret - 6) < 0) return NULL;
 372                 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
 373                 if (s->tlsext_ellipticcurvelist_length > 65532)
 374                         {
 375                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 376                         return NULL;
 377                         }
 378
 379                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
 380                 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
 381
 382                 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
 383                  * elliptic_curve_list, but the examples use two bytes.
 384                  * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
 385                  * resolves this to two bytes.
 386                  */
 387                 s2n(s->tlsext_ellipticcurvelist_length, ret);
 388                 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
 389                 ret+=s->tlsext_ellipticcurvelist_length;
 390                 }
 391 #endif /* OPENSSL_NO_EC */
 392
 393         if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
 394                 {
 395                 int ticklen;
 396                 if (!s->new_session && s->session && s->session->tlsext_tick)
 397                         ticklen = s->session->tlsext_ticklen;
 398                 else if (s->session && s->tlsext_session_ticket &&
 399                          s->tlsext_session_ticket->data)
 400                         {
 401                         ticklen = s->tlsext_session_ticket->length;
 402                         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
 403                         if (!s->session->tlsext_tick)
 404                                 return NULL;
 405                         memcpy(s->session->tlsext_tick,
 406                                s->tlsext_session_ticket->data,
 407                                ticklen);
 408                         s->session->tlsext_ticklen = ticklen;
 409                         }
 410                 else
 411                         ticklen = 0;
 412                 if (ticklen == 0 && s->tlsext_session_ticket &&
 413                     s->tlsext_session_ticket->data == NULL)
 414                         goto skip_ext;
 415                 /* Check for enough room 2 for extension type, 2 for len
 416                  * rest for ticket
 417                  */
 418                 if ((long)(limit - ret - 4 - ticklen) < 0) return NULL;
 419                 s2n(TLSEXT_TYPE_session_ticket,ret);
 420                 s2n(ticklen,ret);
 421                 if (ticklen)
 422                         {
 423                         memcpy(ret, s->session->tlsext_tick, ticklen);
 424                         ret += ticklen;
 425                         }
 426                 }
 427                 skip_ext:
 428
 429 #ifdef TLSEXT_TYPE_opaque_prf_input
 430         if (s->s3->client_opaque_prf_input != NULL &&
 431             s->version != DTLS1_VERSION)
 432                 {
 433                 size_t col = s->s3->client_opaque_prf_input_len;
 434
 435                 if ((long)(limit - ret - 6 - col < 0))
 436                         return NULL;
 437                 if (col > 0xFFFD) /* can't happen */
 438                         return NULL;
 439
 440                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
 441                 s2n(col + 2, ret);
 442                 s2n(col, ret);
 443                 memcpy(ret, s->s3->client_opaque_prf_input, col);
 444                 ret += col;
 445                 }
 446 #endif
 447
 448         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp &&
 449             s->version != DTLS1_VERSION)
 450                 {
 451                 int i;
 452                 long extlen, idlen, itmp;
 453                 OCSP_RESPID *id;
 454
 455                 idlen = 0;
 456                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
 457                         {
 458                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
 459                         itmp = i2d_OCSP_RESPID(id, NULL);
 460                         if (itmp <= 0)
 461                                 return NULL;
 462                         idlen += itmp + 2;
 463                         }
 464
 465                 if (s->tlsext_ocsp_exts)
 466                         {
 467                         extlen = i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, NULL);
 468                         if (extlen < 0)
 469                                 return NULL;
 470                         }
 471                 else
 472                         extlen = 0;
 473
 474                 if ((long)(limit - ret - 7 - extlen - idlen) < 0) return NULL;
 475                 s2n(TLSEXT_TYPE_status_request, ret);
 476                 if (extlen + idlen > 0xFFF0)
 477                         return NULL;
 478                 s2n(extlen + idlen + 5, ret);
 479                 *(ret++) = TLSEXT_STATUSTYPE_ocsp;
 480                 s2n(idlen, ret);
 481                 for (i = 0; i < sk_OCSP_RESPID_num(s->tlsext_ocsp_ids); i++)
 482                         {
 483                         /* save position of id len */
 484                         unsigned char *q = ret;
 485                         id = sk_OCSP_RESPID_value(s->tlsext_ocsp_ids, i);
 486                         /* skip over id len */
 487                         ret += 2;
 488                         itmp = i2d_OCSP_RESPID(id, &ret);
 489                         /* write id len */
 490                         s2n(itmp, q);
 491                         }
 492                 s2n(extlen, ret);
 493                 if (extlen > 0)
 494                         i2d_X509_EXTENSIONS(s->tlsext_ocsp_exts, &ret);
 495                 }
 496
 497         if ((extdatalen = ret-p-2)== 0)
 498                 return p;
 499
 500         s2n(extdatalen,p);
 501         return ret;
 502         }
 503
 504 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 505         {
 506         int extdatalen=0;
 507         unsigned char *ret = p;
 508
 509         /* don't add extensions for SSLv3, unless doing secure renegotiation */
 510         if (s->version == SSL3_VERSION && !s->s3->send_connection_binding)
 511                 return p;
 512
 513         ret+=2;
 514         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 515
 516         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 517                 {
 518                 if ((long)(limit - ret - 4) < 0) return NULL;
 519
 520                 s2n(TLSEXT_TYPE_server_name,ret);
 521                 s2n(0,ret);
 522                 }
 523
 524         if(s->s3->send_connection_binding)
 525         {
 526           int el;
 527
 528           if(!ssl_add_serverhello_renegotiate_ext(s, 0, &el, 0))
 529               {
 530               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 531               return NULL;
 532               }
 533
 534           if((limit - p - 4 - el) < 0) return NULL;
 535
 536           s2n(TLSEXT_TYPE_renegotiate,ret);
 537           s2n(el,ret);
 538
 539           if(!ssl_add_serverhello_renegotiate_ext(s, ret, &el, el))
 540               {
 541               SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 542               return NULL;
 543               }
 544
 545           ret += el;
 546         }
 547
 548 #ifndef OPENSSL_NO_EC
 549         if (s->tlsext_ecpointformatlist != NULL &&
 550             s->version != DTLS1_VERSION)
 551                 {
 552                 /* Add TLS extension ECPointFormats to the ServerHello message */
 553                 long lenmax;
 554
 555                 if ((lenmax = limit - ret - 5) < 0) return NULL;
 556                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 557                 if (s->tlsext_ecpointformatlist_length > 255)
 558                         {
 559                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 560                         return NULL;
 561                         }
 562
 563                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 564                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 565                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 566                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 567                 ret+=s->tlsext_ecpointformatlist_length;
 568
 569                 }
 570         /* Currently the server should not respond with a SupportedCurves extension */
 571 #endif /* OPENSSL_NO_EC */
 572
 573         if (s->tlsext_ticket_expected
 574                 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
 575                 {
 576                 if ((long)(limit - ret - 4) < 0) return NULL;
 577                 s2n(TLSEXT_TYPE_session_ticket,ret);
 578                 s2n(0,ret);
 579                 }
 580
 581         if (s->tlsext_status_expected)
 582                 {
 583                 if ((long)(limit - ret - 4) < 0) return NULL;
 584                 s2n(TLSEXT_TYPE_status_request,ret);
 585                 s2n(0,ret);
 586                 }
 587
 588 #ifdef TLSEXT_TYPE_opaque_prf_input
 589         if (s->s3->server_opaque_prf_input != NULL &&
 590             s->version != DTLS1_VERSION)
 591                 {
 592                 size_t sol = s->s3->server_opaque_prf_input_len;
 593
 594                 if ((long)(limit - ret - 6 - sol) < 0)
 595                         return NULL;
 596                 if (sol > 0xFFFD) /* can't happen */
 597                         return NULL;
 598
 599                 s2n(TLSEXT_TYPE_opaque_prf_input, ret);
 600                 s2n(sol + 2, ret);
 601                 s2n(sol, ret);
 602                 memcpy(ret, s->s3->server_opaque_prf_input, sol);
 603                 ret += sol;
 604                 }
 605 #endif
 606         if (((s->s3->tmp.new_cipher->id & 0xFFFF)==0x80 || (s->s3->tmp.new_cipher->id & 0xFFFF)==0x81)
 607                 && (SSL_get_options(s) & SSL_OP_CRYPTOPRO_TLSEXT_BUG))
 608                 { const unsigned char cryptopro_ext[36] = {
 609                         0xfd, 0xe8, /*65000*/
 610                         0x00, 0x20, /*32 bytes length*/
 611                         0x30, 0x1e, 0x30, 0x08, 0x06, 0x06, 0x2a, 0x85,
 612                         0x03,   0x02, 0x02, 0x09, 0x30, 0x08, 0x06, 0x06,
 613                         0x2a, 0x85, 0x03, 0x02, 0x02, 0x16, 0x30, 0x08,
 614                         0x06, 0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x17};
 615                         if (limit-ret<36) return NULL;
 616                         memcpy(ret,cryptopro_ext,36);
 617                         ret+=36;
 618
 619                 }
 620
 621         if ((extdatalen = ret-p-2)== 0)
 622                 return p;
 623
 624         s2n(extdatalen,p);
 625         return ret;
 626         }
 627
 628 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 629         {
 630         unsigned short type;
 631         unsigned short size;
 632         unsigned short len;
 633         unsigned char *data = *p;
 634         int renegotiate_seen = 0;
 635
 636         s->servername_done = 0;
 637         s->tlsext_status_type = -1;
 638
 639         if (data >= (d+n-2))
 640                 goto ri_check;
 641         n2s(data,len);
 642
 643         if (data > (d+n-len))
 644                 goto ri_check;
 645
 646         while (data <= (d+n-4))
 647                 {
 648                 n2s(data,type);
 649                 n2s(data,size);
 650
 651                 if (data+size > (d+n))
 652                         goto ri_check;
 653 #if 0
 654                 fprintf(stderr,"Received extension type %d size %d\n",type,size);
 655 #endif
 656                 if (s->tlsext_debug_cb)
 657                         s->tlsext_debug_cb(s, 0, type, data, size,
 658                                                 s->tlsext_debug_arg);
 659 /* The servername extension is treated as follows:
 660
 661    - Only the hostname type is supported with a maximum length of 255.
 662    - The servername is rejected if too long or if it contains zeros,
 663      in which case an fatal alert is generated.
 664    - The servername field is maintained together with the session cache.
 665    - When a session is resumed, the servername call back invoked in order
 666      to allow the application to position itself to the right context.
 667    - The servername is acknowledged if it is new for a session or when
 668      it is identical to a previously used for the same session.
 669      Applications can control the behaviour.  They can at any time
 670      set a 'desirable' servername for a new SSL object. This can be the
 671      case for example with HTTPS when a Host: header field is received and
 672      a renegotiation is requested. In this case, a possible servername
 673      presented in the new client hello is only acknowledged if it matches
 674      the value of the Host: field.
 675    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 676      if they provide for changing an explicit servername context for the session,
 677      i.e. when the session has been established with a servername extension.
 678    - On session reconnect, the servername extension may be absent.
 679
 680 */
 681
 682                 if (type == TLSEXT_TYPE_server_name)
 683                         {
 684                         unsigned char *sdata;
 685                         int servname_type;
 686                         int dsize;
 687
 688                         if (size < 2)
 689                                 {
 690                                 *al = SSL_AD_DECODE_ERROR;
 691                                 return 0;
 692                                 }
 693                         n2s(data,dsize);
 694                         size -= 2;
 695                         if (dsize > size  )
 696                                 {
 697                                 *al = SSL_AD_DECODE_ERROR;
 698                                 return 0;
 699                                 }
 700
 701                         sdata = data;
 702                         while (dsize > 3)
 703                                 {
 704                                 servname_type = *(sdata++);
 705                                 n2s(sdata,len);
 706                                 dsize -= 3;
 707
 708                                 if (len > dsize)
 709                                         {
 710                                         *al = SSL_AD_DECODE_ERROR;
 711                                         return 0;
 712                                         }
 713                                 if (s->servername_done == 0)
 714                                 switch (servname_type)
 715                                         {
 716                                 case TLSEXT_NAMETYPE_host_name:
 717                                         if (!s->hit)
 718                                                 {
 719                                                 if(s->session->tlsext_hostname)
 720                                                         {
 721                                                         *al = SSL_AD_DECODE_ERROR;
 722                                                         return 0;
 723                                                         }
 724                                                 if (len > TLSEXT_MAXLEN_host_name)
 725                                                         {
 726                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 727                                                         return 0;
 728                                                         }
 729                                                 if ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL)
 730                                                         {
 731                                                         *al = TLS1_AD_INTERNAL_ERROR;
 732                                                         return 0;
 733                                                         }
 734                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 735                                                 s->session->tlsext_hostname[len]='\0';
 736                                                 if (strlen(s->session->tlsext_hostname) != len) {
 737                                                         OPENSSL_free(s->session->tlsext_hostname);
 738                                                         s->session->tlsext_hostname = NULL;
 739                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 740                                                         return 0;
 741                                                 }
 742                                                 s->servername_done = 1;
 743
 744                                                 }
 745                                         else
 746                                                 s->servername_done = s->session->tlsext_hostname
 747                                                         && strlen(s->session->tlsext_hostname) == len
 748                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 749
 750                                         break;
 751
 752                                 default:
 753                                         break;
 754                                         }
 755
 756                                 dsize -= len;
 757                                 }
 758                         if (dsize != 0)
 759                                 {
 760                                 *al = SSL_AD_DECODE_ERROR;
 761                                 return 0;
 762                                 }
 763
 764                         }
 765
 766 #ifndef OPENSSL_NO_EC
 767                 else if (type == TLSEXT_TYPE_ec_point_formats &&
 768                      s->version != DTLS1_VERSION)
 769                         {
 770                         unsigned char *sdata = data;
 771                         int ecpointformatlist_length = *(sdata++);
 772
 773                         if (ecpointformatlist_length != size - 1)
 774                                 {
 775                                 *al = TLS1_AD_DECODE_ERROR;
 776                                 return 0;
 777                                 }
 778                         if (!s->hit)
 779                                 {
 780                                 if(s->session->tlsext_ecpointformatlist)
 781                                         {
 782                                         OPENSSL_free(s->session->tlsext_ecpointformatlist);
 783                                         s->session->tlsext_ecpointformatlist = NULL;
 784                                         }
 785                                 s->session->tlsext_ecpointformatlist_length = 0;
 786                                 if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 787                                         {
 788                                         *al = TLS1_AD_INTERNAL_ERROR;
 789                                         return 0;
 790                                         }
 791                                 s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 792                                 memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 793                                 }
 794 #if 0
 795                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 796                         sdata = s->session->tlsext_ecpointformatlist;
 797                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 798                                 fprintf(stderr,"%i ",*(sdata++));
 799                         fprintf(stderr,"\n");
 800 #endif
 801                         }
 802                 else if (type == TLSEXT_TYPE_elliptic_curves &&
 803                      s->version != DTLS1_VERSION)
 804                         {
 805                         unsigned char *sdata = data;
 806                         int ellipticcurvelist_length = (*(sdata++) << 8);
 807                         ellipticcurvelist_length += (*(sdata++));
 808
 809                         if (ellipticcurvelist_length != size - 2)
 810                                 {
 811                                 *al = TLS1_AD_DECODE_ERROR;
 812                                 return 0;
 813                                 }
 814                         if (!s->hit)
 815                                 {
 816                                 if(s->session->tlsext_ellipticcurvelist)
 817                                         {
 818                                         *al = TLS1_AD_DECODE_ERROR;
 819                                         return 0;
 820                                         }
 821                                 s->session->tlsext_ellipticcurvelist_length = 0;
 822                                 if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
 823                                         {
 824                                         *al = TLS1_AD_INTERNAL_ERROR;
 825                                         return 0;
 826                                         }
 827                                 s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
 828                                 memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
 829                                 }
 830 #if 0
 831                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
 832                         sdata = s->session->tlsext_ellipticcurvelist;
 833                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
 834                                 fprintf(stderr,"%i ",*(sdata++));
 835                         fprintf(stderr,"\n");
 836 #endif
 837                         }
 838 #endif /* OPENSSL_NO_EC */
 839 #ifdef TLSEXT_TYPE_opaque_prf_input
 840                 else if (type == TLSEXT_TYPE_opaque_prf_input &&
 841                      s->version != DTLS1_VERSION)
 842                         {
 843                         unsigned char *sdata = data;
 844
 845                         if (size < 2)
 846                                 {
 847                                 *al = SSL_AD_DECODE_ERROR;
 848                                 return 0;
 849                                 }
 850                         n2s(sdata, s->s3->client_opaque_prf_input_len);
 851                         if (s->s3->client_opaque_prf_input_len != size - 2)
 852                                 {
 853                                 *al = SSL_AD_DECODE_ERROR;
 854                                 return 0;
 855                                 }
 856
 857                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
 858                                 OPENSSL_free(s->s3->client_opaque_prf_input);
 859                         if (s->s3->client_opaque_prf_input_len == 0)
 860                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
 861                         else
 862                                 s->s3->client_opaque_prf_input = BUF_memdup(sdata, s->s3->client_opaque_prf_input_len);
 863                         if (s->s3->client_opaque_prf_input == NULL)
 864                                 {
 865                                 *al = TLS1_AD_INTERNAL_ERROR;
 866                                 return 0;
 867                                 }
 868                         }
 869 #endif
 870                 else if (type == TLSEXT_TYPE_session_ticket)
 871                         {
 872                         if (s->tls_session_ticket_ext_cb &&
 873                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
 874                                 {
 875                                 *al = TLS1_AD_INTERNAL_ERROR;
 876                                 return 0;
 877                                 }
 878                         }
 879                 else if (type == TLSEXT_TYPE_renegotiate)
 880                         {
 881                         if(!ssl_parse_clienthello_renegotiate_ext(s, data, size, al))
 882                                 return 0;
 883                         renegotiate_seen = 1;
 884                         }
 885                 else if (type == TLSEXT_TYPE_status_request &&
 886                          s->version != DTLS1_VERSION && s->ctx->tlsext_status_cb)
 887                         {
 888
 889                         if (size < 5)
 890                                 {
 891                                 *al = SSL_AD_DECODE_ERROR;
 892                                 return 0;
 893                                 }
 894
 895                         s->tlsext_status_type = *data++;
 896                         size--;
 897                         if (s->tlsext_status_type == TLSEXT_STATUSTYPE_ocsp)
 898                                 {
 899                                 const unsigned char *sdata;
 900                                 int dsize;
 901                                 /* Read in responder_id_list */
 902                                 n2s(data,dsize);
 903                                 size -= 2;
 904                                 if (dsize > size  )
 905                                         {
 906                                         *al = SSL_AD_DECODE_ERROR;
 907                                         return 0;
 908                                         }
 909                                 while (dsize > 0)
 910                                         {
 911                                         OCSP_RESPID *id;
 912                                         int idsize;
 913                                         if (dsize < 4)
 914                                                 {
 915                                                 *al = SSL_AD_DECODE_ERROR;
 916                                                 return 0;
 917                                                 }
 918                                         n2s(data, idsize);
 919                                         dsize -= 2 + idsize;
 920                                         size -= 2 + idsize;
 921                                         if (dsize < 0)
 922                                                 {
 923                                                 *al = SSL_AD_DECODE_ERROR;
 924                                                 return 0;
 925                                                 }
 926                                         sdata = data;
 927                                         data += idsize;
 928                                         id = d2i_OCSP_RESPID(NULL,
 929                                                                 &sdata, idsize);
 930                                         if (!id)
 931                                                 {
 932                                                 *al = SSL_AD_DECODE_ERROR;
 933                                                 return 0;
 934                                                 }
 935                                         if (data != sdata)
 936                                                 {
 937                                                 OCSP_RESPID_free(id);
 938                                                 *al = SSL_AD_DECODE_ERROR;
 939                                                 return 0;
 940                                                 }
 941                                         if (!s->tlsext_ocsp_ids
 942                                                 && !(s->tlsext_ocsp_ids =
 943                                                 sk_OCSP_RESPID_new_null()))
 944                                                 {
 945                                                 OCSP_RESPID_free(id);
 946                                                 *al = SSL_AD_INTERNAL_ERROR;
 947                                                 return 0;
 948                                                 }
 949                                         if (!sk_OCSP_RESPID_push(
 950                                                         s->tlsext_ocsp_ids, id))
 951                                                 {
 952                                                 OCSP_RESPID_free(id);
 953                                                 *al = SSL_AD_INTERNAL_ERROR;
 954                                                 return 0;
 955                                                 }
 956                                         }
 957
 958                                 /* Read in request_extensions */
 959                                 if (size < 2)
 960                                         {
 961                                         *al = SSL_AD_DECODE_ERROR;
 962                                         return 0;
 963                                         }
 964                                 n2s(data,dsize);
 965                                 size -= 2;
 966                                 if (dsize != size)
 967                                         {
 968                                         *al = SSL_AD_DECODE_ERROR;
 969                                         return 0;
 970                                         }
 971                                 sdata = data;
 972                                 if (dsize > 0)
 973                                         {
 974                                         s->tlsext_ocsp_exts =
 975                                                 d2i_X509_EXTENSIONS(NULL,
 976                                                         &sdata, dsize);
 977                                         if (!s->tlsext_ocsp_exts
 978                                                 || (data + dsize != sdata))
 979                                                 {
 980                                                 *al = SSL_AD_DECODE_ERROR;
 981                                                 return 0;
 982                                                 }
 983                                         }
 984                                 }
 985                                 /* We don't know what to do with any other type
 986                                 * so ignore it.
 987                                 */
 988                                 else
 989                                         s->tlsext_status_type = -1;
 990                         }
 991
 992                 /* session ticket processed earlier */
 993                 data+=size;
 994                 }
 995
 996         *p = data;
 997
 998         ri_check:
 999
1000         /* Need RI if renegotiating */
1001
1002         if (!renegotiate_seen && s->new_session &&
1003                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1004                 {
1005                 *al = SSL_AD_HANDSHAKE_FAILURE;
1006                 SSLerr(SSL_F_SSL_PARSE_CLIENTHELLO_TLSEXT,
1007                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1008                 return 0;
1009                 }
1010
1011         return 1;
1012         }
1013
1014 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
1015         {
1016         unsigned short length;
1017         unsigned short type;
1018         unsigned short size;
1019         unsigned char *data = *p;
1020         int tlsext_servername = 0;
1021         int renegotiate_seen = 0;
1022
1023         if (data >= (d+n-2))
1024                 goto ri_check;
1025
1026         n2s(data,length);
1027         if (data+length != d+n)
1028                 {
1029                 *al = SSL_AD_DECODE_ERROR;
1030                 return 0;
1031                 }
1032
1033         while(data <= (d+n-4))
1034                 {
1035                 n2s(data,type);
1036                 n2s(data,size);
1037
1038                 if (data+size > (d+n))
1039                         goto ri_check;
1040
1041                 if (s->tlsext_debug_cb)
1042                         s->tlsext_debug_cb(s, 1, type, data, size,
1043                                                 s->tlsext_debug_arg);
1044
1045                 if (type == TLSEXT_TYPE_server_name)
1046                         {
1047                         if (s->tlsext_hostname == NULL || size > 0)
1048                                 {
1049                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
1050                                 return 0;
1051                                 }
1052                         tlsext_servername = 1;
1053                         }
1054
1055 #ifndef OPENSSL_NO_EC
1056                 else if (type == TLSEXT_TYPE_ec_point_formats &&
1057                      s->version != DTLS1_VERSION)
1058                         {
1059                         unsigned char *sdata = data;
1060                         int ecpointformatlist_length = *(sdata++);
1061
1062                         if (ecpointformatlist_length != size - 1)
1063                                 {
1064                                 *al = TLS1_AD_DECODE_ERROR;
1065                                 return 0;
1066                                 }
1067                         s->session->tlsext_ecpointformatlist_length = 0;
1068                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
1069                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
1070                                 {
1071                                 *al = TLS1_AD_INTERNAL_ERROR;
1072                                 return 0;
1073                                 }
1074                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
1075                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
1076 #if 0
1077                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
1078                         sdata = s->session->tlsext_ecpointformatlist;
1079                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1080                                 fprintf(stderr,"%i ",*(sdata++));
1081                         fprintf(stderr,"\n");
1082 #endif
1083                         }
1084 #endif /* OPENSSL_NO_EC */
1085
1086                 else if (type == TLSEXT_TYPE_session_ticket)
1087                         {
1088                         if (s->tls_session_ticket_ext_cb &&
1089                             !s->tls_session_ticket_ext_cb(s, data, size, s->tls_session_ticket_ext_cb_arg))
1090                                 {
1091                                 *al = TLS1_AD_INTERNAL_ERROR;
1092                                 return 0;
1093                                 }
1094                         if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
1095                                 || (size > 0))
1096                                 {
1097                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1098                                 return 0;
1099                                 }
1100                         s->tlsext_ticket_expected = 1;
1101                         }
1102 #ifdef TLSEXT_TYPE_opaque_prf_input
1103                 else if (type == TLSEXT_TYPE_opaque_prf_input &&
1104                      s->version != DTLS1_VERSION)
1105                         {
1106                         unsigned char *sdata = data;
1107
1108                         if (size < 2)
1109                                 {
1110                                 *al = SSL_AD_DECODE_ERROR;
1111                                 return 0;
1112                                 }
1113                         n2s(sdata, s->s3->server_opaque_prf_input_len);
1114                         if (s->s3->server_opaque_prf_input_len != size - 2)
1115                                 {
1116                                 *al = SSL_AD_DECODE_ERROR;
1117                                 return 0;
1118                                 }
1119
1120                         if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1121                                 OPENSSL_free(s->s3->server_opaque_prf_input);
1122                         if (s->s3->server_opaque_prf_input_len == 0)
1123                                 s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1124                         else
1125                                 s->s3->server_opaque_prf_input = BUF_memdup(sdata, s->s3->server_opaque_prf_input_len);
1126
1127                         if (s->s3->server_opaque_prf_input == NULL)
1128                                 {
1129                                 *al = TLS1_AD_INTERNAL_ERROR;
1130                                 return 0;
1131                                 }
1132                         }
1133 #endif
1134                 else if (type == TLSEXT_TYPE_status_request &&
1135                          s->version != DTLS1_VERSION)
1136                         {
1137                         /* MUST be empty and only sent if we've requested
1138                          * a status request message.
1139                          */
1140                         if ((s->tlsext_status_type == -1) || (size > 0))
1141                                 {
1142                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
1143                                 return 0;
1144                                 }
1145                         /* Set flag to expect CertificateStatus message */
1146                         s->tlsext_status_expected = 1;
1147                         }
1148                 else if (type == TLSEXT_TYPE_renegotiate)
1149                         {
1150                         if(!ssl_parse_serverhello_renegotiate_ext(s, data, size, al))
1151                                 return 0;
1152                         renegotiate_seen = 1;
1153                         }
1154                 data+=size;
1155                 }
1156
1157         if (data != d+n)
1158                 {
1159                 *al = SSL_AD_DECODE_ERROR;
1160                 return 0;
1161                 }
1162
1163         if (!s->hit && tlsext_servername == 1)
1164                 {
1165                 if (s->tlsext_hostname)
1166                         {
1167                         if (s->session->tlsext_hostname == NULL)
1168                                 {
1169                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
1170                                 if (!s->session->tlsext_hostname)
1171                                         {
1172                                         *al = SSL_AD_UNRECOGNIZED_NAME;
1173                                         return 0;
1174                                         }
1175                                 }
1176                         else
1177                                 {
1178                                 *al = SSL_AD_DECODE_ERROR;
1179                                 return 0;
1180                                 }
1181                         }
1182                 }
1183
1184         *p = data;
1185
1186         ri_check:
1187
1188         /* Determine if we need to see RI. Strictly speaking if we want to
1189          * avoid an attack we should *always* see RI even on initial server
1190          * hello because the client doesn't see any renegotiation during an
1191          * attack. However this would mean we could not connect to any server
1192          * which doesn't support RI so for the immediate future tolerate RI
1193          * absence on initial connect only.
1194          */
1195         if (!renegotiate_seen
1196                 && !(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
1197                 && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
1198                 {
1199                 *al = SSL_AD_HANDSHAKE_FAILURE;
1200                 SSLerr(SSL_F_SSL_PARSE_SERVERHELLO_TLSEXT,
1201                                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
1202                 return 0;
1203                 }
1204
1205         return 1;
1206         }
1207
1208
1209 int ssl_prepare_clienthello_tlsext(SSL *s)
1210         {
1211 #ifndef OPENSSL_NO_EC
1212         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
1213          * and elliptic curves we support.
1214          */
1215         int using_ecc = 0;
1216         int i;
1217         unsigned char *j;
1218         unsigned long alg_k, alg_a;
1219         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
1220
1221         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
1222                 {
1223                 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
1224
1225                 alg_k = c->algorithm_mkey;
1226                 alg_a = c->algorithm_auth;
1227                 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
1228                         {
1229                         using_ecc = 1;
1230                         break;
1231                         }
1232                 }
1233         using_ecc = using_ecc && (s->version == TLS1_VERSION);
1234         if (using_ecc)
1235                 {
1236                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1237                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1238                         {
1239                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1240                         return -1;
1241                         }
1242                 s->tlsext_ecpointformatlist_length = 3;
1243                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1244                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1245                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1246
1247                 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
1248                 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
1249                 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
1250                 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
1251                         {
1252                         s->tlsext_ellipticcurvelist_length = 0;
1253                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1254                         return -1;
1255                         }
1256                 for (i = 1, j = s->tlsext_ellipticcurvelist; (unsigned int)i <=
1257                                 sizeof(nid_list)/sizeof(nid_list[0]); i++)
1258                         s2n(i,j);
1259                 }
1260 #endif /* OPENSSL_NO_EC */
1261
1262 #ifdef TLSEXT_TYPE_opaque_prf_input
1263         {
1264                 int r = 1;
1265
1266                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1267                         {
1268                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1269                         if (!r)
1270                                 return -1;
1271                         }
1272
1273                 if (s->tlsext_opaque_prf_input != NULL)
1274                         {
1275                         if (s->s3->client_opaque_prf_input != NULL) /* shouldn't really happen */
1276                                 OPENSSL_free(s->s3->client_opaque_prf_input);
1277
1278                         if (s->tlsext_opaque_prf_input_len == 0)
1279                                 s->s3->client_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1280                         else
1281                                 s->s3->client_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1282                         if (s->s3->client_opaque_prf_input == NULL)
1283                                 {
1284                                 SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1285                                 return -1;
1286                                 }
1287                         s->s3->client_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1288                         }
1289
1290                 if (r == 2)
1291                         /* at callback's request, insist on receiving an appropriate server opaque PRF input */
1292                         s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1293         }
1294 #endif
1295
1296         return 1;
1297         }
1298
1299 int ssl_prepare_serverhello_tlsext(SSL *s)
1300         {
1301 #ifndef OPENSSL_NO_EC
1302         /* If we are server and using an ECC cipher suite, send the point formats we support
1303          * if the client sent us an ECPointsFormat extension.  Note that the server is not
1304          * supposed to send an EllipticCurves extension.
1305          */
1306
1307         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1308         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1309         int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
1310         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
1311
1312         if (using_ecc)
1313                 {
1314                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
1315                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
1316                         {
1317                         SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
1318                         return -1;
1319                         }
1320                 s->tlsext_ecpointformatlist_length = 3;
1321                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
1322                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
1323                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
1324                 }
1325 #endif /* OPENSSL_NO_EC */
1326
1327         return 1;
1328         }
1329
1330 int ssl_check_clienthello_tlsext(SSL *s)
1331         {
1332         int ret=SSL_TLSEXT_ERR_NOACK;
1333         int al = SSL_AD_UNRECOGNIZED_NAME;
1334
1335 #ifndef OPENSSL_NO_EC
1336         /* The handling of the ECPointFormats extension is done elsewhere, namely in
1337          * ssl3_choose_cipher in s3_lib.c.
1338          */
1339         /* The handling of the EllipticCurves extension is done elsewhere, namely in
1340          * ssl3_choose_cipher in s3_lib.c.
1341          */
1342 #endif
1343
1344         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1345                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1346         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1347                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1348
1349         /* If status request then ask callback what to do.
1350          * Note: this must be called after servername callbacks in case
1351          * the certificate has changed.
1352          */
1353         if ((s->tlsext_status_type != -1) && s->ctx && s->ctx->tlsext_status_cb)
1354                 {
1355                 int r;
1356                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1357                 switch (r)
1358                         {
1359                         /* We don't want to send a status request response */
1360                         case SSL_TLSEXT_ERR_NOACK:
1361                                 s->tlsext_status_expected = 0;
1362                                 break;
1363                         /* status request response should be sent */
1364                         case SSL_TLSEXT_ERR_OK:
1365                                 if (s->tlsext_ocsp_resp)
1366                                         s->tlsext_status_expected = 1;
1367                                 else
1368                                         s->tlsext_status_expected = 0;
1369                                 break;
1370                         /* something bad happened */
1371                         case SSL_TLSEXT_ERR_ALERT_FATAL:
1372                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1373                                 al = SSL_AD_INTERNAL_ERROR;
1374                                 goto err;
1375                         }
1376                 }
1377         else
1378                 s->tlsext_status_expected = 0;
1379
1380 #ifdef TLSEXT_TYPE_opaque_prf_input
1381         {
1382                 /* This sort of belongs into ssl_prepare_serverhello_tlsext(),
1383                  * but we might be sending an alert in response to the client hello,
1384                  * so this has to happen here in ssl_check_clienthello_tlsext(). */
1385
1386                 int r = 1;
1387
1388                 if (s->ctx->tlsext_opaque_prf_input_callback != 0)
1389                         {
1390                         r = s->ctx->tlsext_opaque_prf_input_callback(s, NULL, 0, s->ctx->tlsext_opaque_prf_input_callback_arg);
1391                         if (!r)
1392                                 {
1393                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1394                                 al = SSL_AD_INTERNAL_ERROR;
1395                                 goto err;
1396                                 }
1397                         }
1398
1399                 if (s->s3->server_opaque_prf_input != NULL) /* shouldn't really happen */
1400                         OPENSSL_free(s->s3->server_opaque_prf_input);
1401                 s->s3->server_opaque_prf_input = NULL;
1402
1403                 if (s->tlsext_opaque_prf_input != NULL)
1404                         {
1405                         if (s->s3->client_opaque_prf_input != NULL &&
1406                                 s->s3->client_opaque_prf_input_len == s->tlsext_opaque_prf_input_len)
1407                                 {
1408                                 /* can only use this extension if we have a server opaque PRF input
1409                                  * of the same length as the client opaque PRF input! */
1410
1411                                 if (s->tlsext_opaque_prf_input_len == 0)
1412                                         s->s3->server_opaque_prf_input = OPENSSL_malloc(1); /* dummy byte just to get non-NULL */
1413                                 else
1414                                         s->s3->server_opaque_prf_input = BUF_memdup(s->tlsext_opaque_prf_input, s->tlsext_opaque_prf_input_len);
1415                                 if (s->s3->server_opaque_prf_input == NULL)
1416                                         {
1417                                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1418                                         al = SSL_AD_INTERNAL_ERROR;
1419                                         goto err;
1420                                         }
1421                                 s->s3->server_opaque_prf_input_len = s->tlsext_opaque_prf_input_len;
1422                                 }
1423                         }
1424
1425                 if (r == 2 && s->s3->server_opaque_prf_input == NULL)
1426                         {
1427                         /* The callback wants to enforce use of the extension,
1428                          * but we can't do that with the client opaque PRF input;
1429                          * abort the handshake.
1430                          */
1431                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1432                         al = SSL_AD_HANDSHAKE_FAILURE;
1433                         }
1434         }
1435
1436 #endif
1437  err:
1438         switch (ret)
1439                 {
1440                 case SSL_TLSEXT_ERR_ALERT_FATAL:
1441                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1442                         return -1;
1443
1444                 case SSL_TLSEXT_ERR_ALERT_WARNING:
1445                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
1446                         return 1;
1447
1448                 case SSL_TLSEXT_ERR_NOACK:
1449                         s->servername_done=0;
1450                         default:
1451                 return 1;
1452                 }
1453         }
1454
1455 int ssl_check_serverhello_tlsext(SSL *s)
1456         {
1457         int ret=SSL_TLSEXT_ERR_NOACK;
1458         int al = SSL_AD_UNRECOGNIZED_NAME;
1459
1460 #ifndef OPENSSL_NO_EC
1461         /* If we are client and using an elliptic curve cryptography cipher
1462          * suite, then if server returns an EC point formats lists extension
1463          * it must contain uncompressed.
1464          */
1465         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
1466         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
1467         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
1468             (s->session->tlsext_ecpointformatlist != NULL) && (s->session->tlsext_ecpointformatlist_length > 0) &&
1469             ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
1470                 {
1471                 /* we are using an ECC cipher */
1472                 size_t i;
1473                 unsigned char *list;
1474                 int found_uncompressed = 0;
1475                 list = s->session->tlsext_ecpointformatlist;
1476                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
1477                         {
1478                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
1479                                 {
1480                                 found_uncompressed = 1;
1481                                 break;
1482                                 }
1483                         }
1484                 if (!found_uncompressed)
1485                         {
1486                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
1487                         return -1;
1488                         }
1489                 }
1490         ret = SSL_TLSEXT_ERR_OK;
1491 #endif /* OPENSSL_NO_EC */
1492
1493         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
1494                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
1495         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
1496                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
1497
1498 #ifdef TLSEXT_TYPE_opaque_prf_input
1499         if (s->s3->server_opaque_prf_input_len > 0)
1500                 {
1501                 /* This case may indicate that we, as a client, want to insist on using opaque PRF inputs.
1502                  * So first verify that we really have a value from the server too. */
1503
1504                 if (s->s3->server_opaque_prf_input == NULL)
1505                         {
1506                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1507                         al = SSL_AD_HANDSHAKE_FAILURE;
1508                         }
1509
1510                 /* Anytime the server *has* sent an opaque PRF input, we need to check
1511                  * that we have a client opaque PRF input of the same size. */
1512                 if (s->s3->client_opaque_prf_input == NULL ||
1513                     s->s3->client_opaque_prf_input_len != s->s3->server_opaque_prf_input_len)
1514                         {
1515                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1516                         al = SSL_AD_ILLEGAL_PARAMETER;
1517                         }
1518                 }
1519 #endif
1520
1521         /* If we've requested certificate status and we wont get one
1522          * tell the callback
1523          */
1524         if ((s->tlsext_status_type != -1) && !(s->tlsext_status_expected)
1525                         && s->ctx && s->ctx->tlsext_status_cb)
1526                 {
1527                 int r;
1528                 /* Set resp to NULL, resplen to -1 so callback knows
1529                  * there is no response.
1530                  */
1531                 if (s->tlsext_ocsp_resp)
1532                         {
1533                         OPENSSL_free(s->tlsext_ocsp_resp);
1534                         s->tlsext_ocsp_resp = NULL;
1535                         }
1536                 s->tlsext_ocsp_resplen = -1;
1537                 r = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1538                 if (r == 0)
1539                         {
1540                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1541                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1542                         }
1543                 if (r < 0)
1544                         {
1545                         al = SSL_AD_INTERNAL_ERROR;
1546                         ret = SSL_TLSEXT_ERR_ALERT_FATAL;
1547                         }
1548                 }
1549
1550         switch (ret)
1551                 {
1552                 case SSL_TLSEXT_ERR_ALERT_FATAL:
1553                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1554                         return -1;
1555
1556                 case SSL_TLSEXT_ERR_ALERT_WARNING:
1557                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
1558                         return 1;
1559
1560                 case SSL_TLSEXT_ERR_NOACK:
1561                         s->servername_done=0;
1562                         default:
1563                 return 1;
1564                 }
1565         }
1566
1567 /* Since the server cache lookup is done early on in the processing of client
1568  * hello and other operations depend on the result we need to handle any TLS
1569  * session ticket extension at the same time.
1570  */
1571
1572 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
1573                                 const unsigned char *limit, SSL_SESSION **ret)
1574         {
1575         /* Point after session ID in client hello */
1576         const unsigned char *p = session_id + len;
1577         unsigned short i;
1578
1579         /* If tickets disabled behave as if no ticket present
1580          * to permit stateful resumption.
1581          */
1582         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1583                 return 1;
1584
1585         if ((s->version <= SSL3_VERSION) || !limit)
1586                 return 1;
1587         if (p >= limit)
1588                 return -1;
1589         /* Skip past DTLS cookie */
1590         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1591                 {
1592                 i = *(p++);
1593                 p+= i;
1594                 if (p >= limit)
1595                         return -1;
1596                 }
1597         /* Skip past cipher list */
1598         n2s(p, i);
1599         p+= i;
1600         if (p >= limit)
1601                 return -1;
1602         /* Skip past compression algorithm list */
1603         i = *(p++);
1604         p += i;
1605         if (p > limit)
1606                 return -1;
1607         /* Now at start of extensions */
1608         if ((p + 2) >= limit)
1609                 return 1;
1610         n2s(p, i);
1611         while ((p + 4) <= limit)
1612                 {
1613                 unsigned short type, size;
1614                 n2s(p, type);
1615                 n2s(p, size);
1616                 if (p + size > limit)
1617                         return 1;
1618                 if (type == TLSEXT_TYPE_session_ticket)
1619                         {
1620                         /* If tickets disabled indicate cache miss which will
1621                          * trigger a full handshake
1622                          */
1623                         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
1624                                 return 1;
1625                         /* If zero length note client will accept a ticket
1626                          * and indicate cache miss to trigger full handshake
1627                          */
1628                         if (size == 0)
1629                                 {
1630                                 s->tlsext_ticket_expected = 1;
1631                                 return 0;       /* Cache miss */
1632                                 }
1633                         if (s->tls_session_secret_cb)
1634                                 {
1635                                 /* Indicate cache miss here and instead of
1636                                  * generating the session from ticket now,
1637                                  * trigger abbreviated handshake based on
1638                                  * external mechanism to calculate the master
1639                                  * secret later. */
1640                                 return 0;
1641                                 }
1642                         return tls_decrypt_ticket(s, p, size, session_id, len,
1643                                                                         ret);
1644                         }
1645                 p += size;
1646                 }
1647         return 1;
1648         }
1649
1650 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
1651                                 const unsigned char *sess_id, int sesslen,
1652                                 SSL_SESSION **psess)
1653         {
1654         SSL_SESSION *sess;
1655         unsigned char *sdec;
1656         const unsigned char *p;
1657         int slen, mlen, renew_ticket = 0;
1658         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
1659         HMAC_CTX hctx;
1660         EVP_CIPHER_CTX ctx;
1661         SSL_CTX *tctx = s->initial_ctx;
1662         /* Need at least keyname + iv + some encrypted data */
1663         if (eticklen < 48)
1664                 goto tickerr;
1665         /* Initialize session ticket encryption and HMAC contexts */
1666         HMAC_CTX_init(&hctx);
1667         EVP_CIPHER_CTX_init(&ctx);
1668         if (tctx->tlsext_ticket_key_cb)
1669                 {
1670                 unsigned char *nctick = (unsigned char *)etick;
1671                 int rv = tctx->tlsext_ticket_key_cb(s, nctick, nctick + 16,
1672                                                         &ctx, &hctx, 0);
1673                 if (rv < 0)
1674                         return -1;
1675                 if (rv == 0)
1676                         goto tickerr;
1677                 if (rv == 2)
1678                         renew_ticket = 1;
1679                 }
1680         else
1681                 {
1682                 /* Check key name matches */
1683                 if (memcmp(etick, tctx->tlsext_tick_key_name, 16))
1684                         goto tickerr;
1685                 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1686                                         tlsext_tick_md(), NULL);
1687                 EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1688                                 tctx->tlsext_tick_aes_key, etick + 16);
1689                 }
1690         /* Attempt to process session ticket, first conduct sanity and
1691          * integrity checks on ticket.
1692          */
1693         mlen = HMAC_size(&hctx);
1694         if (mlen < 0)
1695                 {
1696                 EVP_CIPHER_CTX_cleanup(&ctx);
1697                 return -1;
1698                 }
1699         eticklen -= mlen;
1700         /* Check HMAC of encrypted ticket */
1701         HMAC_Update(&hctx, etick, eticklen);
1702         HMAC_Final(&hctx, tick_hmac, NULL);
1703         HMAC_CTX_cleanup(&hctx);
1704         if (memcmp(tick_hmac, etick + eticklen, mlen))
1705                 goto tickerr;
1706         /* Attempt to decrypt session data */
1707         /* Move p after IV to start of encrypted ticket, update length */
1708         p = etick + 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1709         eticklen -= 16 + EVP_CIPHER_CTX_iv_length(&ctx);
1710         sdec = OPENSSL_malloc(eticklen);
1711         if (!sdec)
1712                 {
1713                 EVP_CIPHER_CTX_cleanup(&ctx);
1714                 return -1;
1715                 }
1716         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1717         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1718                 goto tickerr;
1719         slen += mlen;
1720         EVP_CIPHER_CTX_cleanup(&ctx);
1721         p = sdec;
1722
1723         sess = d2i_SSL_SESSION(NULL, &p, slen);
1724         OPENSSL_free(sdec);
1725         if (sess)
1726                 {
1727                 /* The session ID if non-empty is used by some clients to
1728                  * detect that the ticket has been accepted. So we copy it to
1729                  * the session structure. If it is empty set length to zero
1730                  * as required by standard.
1731                  */
1732                 if (sesslen)
1733                         memcpy(sess->session_id, sess_id, sesslen);
1734                 sess->session_id_length = sesslen;
1735                 *psess = sess;
1736                 s->tlsext_ticket_expected = renew_ticket;
1737                 return 1;
1738                 }
1739         /* If session decrypt failure indicate a cache miss and set state to
1740          * send a new ticket
1741          */
1742         tickerr:
1743         s->tlsext_ticket_expected = 1;
1744         return 0;
1745         }
1746
1747 #endif