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 "ssl_locl.h"
 117
 118 const char tls1_version_str[]="TLSv1" OPENSSL_VERSION_PTEXT;
 119
 120 #ifndef OPENSSL_NO_TLSEXT
 121 static int tls_decrypt_ticket(SSL *s, const unsigned char *tick, int ticklen,
 122                                 const unsigned char *sess_id, int sesslen,
 123                                 SSL_SESSION **psess);
 124 #endif
 125
 126 SSL3_ENC_METHOD TLSv1_enc_data={
 127         tls1_enc,
 128         tls1_mac,
 129         tls1_setup_key_block,
 130         tls1_generate_master_secret,
 131         tls1_change_cipher_state,
 132         tls1_final_finish_mac,
 133         TLS1_FINISH_MAC_LENGTH,
 134         tls1_cert_verify_mac,
 135         TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
 136         TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
 137         tls1_alert_code,
 138         };
 139
 140 long tls1_default_timeout(void)
 141         {
 142         /* 2 hours, the 24 hours mentioned in the TLSv1 spec
 143          * is way too long for http, the cache would over fill */
 144         return(60*60*2);
 145         }
 146
 147 int tls1_new(SSL *s)
 148         {
 149         if (!ssl3_new(s)) return(0);
 150         s->method->ssl_clear(s);
 151         return(1);
 152         }
 153
 154 void tls1_free(SSL *s)
 155         {
 156         ssl3_free(s);
 157         }
 158
 159 void tls1_clear(SSL *s)
 160         {
 161         ssl3_clear(s);
 162         s->version=TLS1_VERSION;
 163         }
 164
 165 #ifndef OPENSSL_NO_EC
 166 static int nid_list[] =
 167         {
 168                 NID_sect163k1, /* sect163k1 (1) */
 169                 NID_sect163r1, /* sect163r1 (2) */
 170                 NID_sect163r2, /* sect163r2 (3) */
 171                 NID_sect193r1, /* sect193r1 (4) */
 172                 NID_sect193r2, /* sect193r2 (5) */
 173                 NID_sect233k1, /* sect233k1 (6) */
 174                 NID_sect233r1, /* sect233r1 (7) */
 175                 NID_sect239k1, /* sect239k1 (8) */
 176                 NID_sect283k1, /* sect283k1 (9) */
 177                 NID_sect283r1, /* sect283r1 (10) */
 178                 NID_sect409k1, /* sect409k1 (11) */
 179                 NID_sect409r1, /* sect409r1 (12) */
 180                 NID_sect571k1, /* sect571k1 (13) */
 181                 NID_sect571r1, /* sect571r1 (14) */
 182                 NID_secp160k1, /* secp160k1 (15) */
 183                 NID_secp160r1, /* secp160r1 (16) */
 184                 NID_secp160r2, /* secp160r2 (17) */
 185                 NID_secp192k1, /* secp192k1 (18) */
 186                 NID_X9_62_prime192v1, /* secp192r1 (19) */
 187                 NID_secp224k1, /* secp224k1 (20) */
 188                 NID_secp224r1, /* secp224r1 (21) */
 189                 NID_secp256k1, /* secp256k1 (22) */
 190                 NID_X9_62_prime256v1, /* secp256r1 (23) */
 191                 NID_secp384r1, /* secp384r1 (24) */
 192                 NID_secp521r1  /* secp521r1 (25) */
 193         };
 194
 195 int tls1_ec_curve_id2nid(int curve_id)
 196         {
 197         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 198         if ((curve_id < 1) || (curve_id > sizeof(nid_list)/sizeof(nid_list[0]))) return 0;
 199         return nid_list[curve_id-1];
 200         }
 201
 202 int tls1_ec_nid2curve_id(int nid)
 203         {
 204         /* ECC curves from draft-ietf-tls-ecc-12.txt (Oct. 17, 2005) */
 205         switch (nid)
 206                 {
 207         case NID_sect163k1: /* sect163k1 (1) */
 208                 return 1;
 209         case NID_sect163r1: /* sect163r1 (2) */
 210                 return 2;
 211         case NID_sect163r2: /* sect163r2 (3) */
 212                 return 3;
 213         case NID_sect193r1: /* sect193r1 (4) */
 214                 return 4;
 215         case NID_sect193r2: /* sect193r2 (5) */
 216                 return 5;
 217         case NID_sect233k1: /* sect233k1 (6) */
 218                 return 6;
 219         case NID_sect233r1: /* sect233r1 (7) */
 220                 return 7;
 221         case NID_sect239k1: /* sect239k1 (8) */
 222                 return 8;
 223         case NID_sect283k1: /* sect283k1 (9) */
 224                 return 9;
 225         case NID_sect283r1: /* sect283r1 (10) */
 226                 return 10;
 227         case NID_sect409k1: /* sect409k1 (11) */
 228                 return 11;
 229         case NID_sect409r1: /* sect409r1 (12) */
 230                 return 12;
 231         case NID_sect571k1: /* sect571k1 (13) */
 232                 return 13;
 233         case NID_sect571r1: /* sect571r1 (14) */
 234                 return 14;
 235         case NID_secp160k1: /* secp160k1 (15) */
 236                 return 15;
 237         case NID_secp160r1: /* secp160r1 (16) */
 238                 return 16;
 239         case NID_secp160r2: /* secp160r2 (17) */
 240                 return 17;
 241         case NID_secp192k1: /* secp192k1 (18) */
 242                 return 18;
 243         case NID_X9_62_prime192v1: /* secp192r1 (19) */
 244                 return 19;
 245         case NID_secp224k1: /* secp224k1 (20) */
 246                 return 20;
 247         case NID_secp224r1: /* secp224r1 (21) */
 248                 return 21;
 249         case NID_secp256k1: /* secp256k1 (22) */
 250                 return 22;
 251         case NID_X9_62_prime256v1: /* secp256r1 (23) */
 252                 return 23;
 253         case NID_secp384r1: /* secp384r1 (24) */
 254                 return 24;
 255         case NID_secp521r1:  /* secp521r1 (25) */
 256                 return 25;
 257         default:
 258                 return 0;
 259                 }
 260         }
 261 #endif /* OPENSSL_NO_EC */
 262
 263 #ifndef OPENSSL_NO_TLSEXT
 264 unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 265         {
 266         int extdatalen=0;
 267         unsigned char *ret = p;
 268
 269         ret+=2;
 270
 271         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 272
 273         if (s->tlsext_hostname != NULL)
 274                 {
 275                 /* Add TLS extension servername to the Client Hello message */
 276                 unsigned long size_str;
 277                 long lenmax;
 278
 279                 /* check for enough space.
 280                    4 for the servername type and entension length
 281                    2 for servernamelist length
 282                    1 for the hostname type
 283                    2 for hostname length
 284                    + hostname length
 285                 */
 286
 287                 if ((lenmax = limit - p - 9) < 0
 288                 || (size_str = strlen(s->tlsext_hostname)) > (unsigned long)lenmax)
 289                         return NULL;
 290
 291                 /* extension type and length */
 292                 s2n(TLSEXT_TYPE_server_name,ret);
 293                 s2n(size_str+5,ret);
 294
 295                 /* length of servername list */
 296                 s2n(size_str+3,ret);
 297
 298                 /* hostname type, length and hostname */
 299                 *(ret++) = (unsigned char) TLSEXT_NAMETYPE_host_name;
 300                 s2n(size_str,ret);
 301                 memcpy(ret, s->tlsext_hostname, size_str);
 302                 ret+=size_str;
 303
 304                 }
 305 #ifndef OPENSSL_NO_EC
 306         if (s->tlsext_ecpointformatlist != NULL)
 307                 {
 308                 /* Add TLS extension ECPointFormats to the ClientHello message */
 309                 long lenmax;
 310
 311                 if ((lenmax = limit - p - 5) < 0) return NULL;
 312                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 313                 if (s->tlsext_ecpointformatlist_length > 255)
 314                         {
 315                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 316                         return NULL;
 317                         }
 318
 319                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 320                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 321                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 322                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 323                 ret+=s->tlsext_ecpointformatlist_length;
 324                 }
 325         if (s->tlsext_ellipticcurvelist != NULL)
 326                 {
 327                 /* Add TLS extension EllipticCurves to the ClientHello message */
 328                 long lenmax;
 329
 330                 if ((lenmax = limit - p - 6) < 0) return NULL;
 331                 if (s->tlsext_ellipticcurvelist_length > (unsigned long)lenmax) return NULL;
 332                 if (s->tlsext_ellipticcurvelist_length > 65532)
 333                         {
 334                         SSLerr(SSL_F_SSL_ADD_CLIENTHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 335                         return NULL;
 336                         }
 337
 338                 s2n(TLSEXT_TYPE_elliptic_curves,ret);
 339                 s2n(s->tlsext_ellipticcurvelist_length + 2, ret);
 340
 341                 /* NB: draft-ietf-tls-ecc-12.txt uses a one-byte prefix for
 342                  * elliptic_curve_list, but the examples use two bytes.
 343                  * http://www1.ietf.org/mail-archive/web/tls/current/msg00538.html
 344                  * resolves this to two bytes.
 345                  */
 346                 s2n(s->tlsext_ellipticcurvelist_length, ret);
 347                 memcpy(ret, s->tlsext_ellipticcurvelist, s->tlsext_ellipticcurvelist_length);
 348                 ret+=s->tlsext_ellipticcurvelist_length;
 349                 }
 350 #endif /* OPENSSL_NO_EC */
 351
 352         if (!(SSL_get_options(s) & SSL_OP_NO_TICKET))
 353                 {
 354                 int ticklen;
 355                 if (s->session && s->session->tlsext_tick)
 356                         ticklen = s->session->tlsext_ticklen;
 357                 else
 358                         ticklen = 0;
 359                 /* Check for enough room 2 for extension type, 2 for len
 360                  * rest for ticket
 361                  */
 362                 if (limit - p - 4 - ticklen < 0)
 363                         return NULL;
 364                 s2n(TLSEXT_TYPE_session_ticket,ret);
 365                 s2n(ticklen,ret);
 366                 if (ticklen)
 367                         {
 368                         memcpy(ret, s->session->tlsext_tick, ticklen);
 369                         ret += ticklen;
 370                         }
 371                 }
 372
 373         if ((extdatalen = ret-p-2)== 0)
 374                 return p;
 375
 376         s2n(extdatalen,p);
 377         return ret;
 378         }
 379
 380 unsigned char *ssl_add_serverhello_tlsext(SSL *s, unsigned char *p, unsigned char *limit)
 381         {
 382         int extdatalen=0;
 383         unsigned char *ret = p;
 384
 385         ret+=2;
 386         if (ret>=limit) return NULL; /* this really never occurs, but ... */
 387
 388         if (!s->hit && s->servername_done == 1 && s->session->tlsext_hostname != NULL)
 389                 {
 390                 if (limit - p - 4 < 0) return NULL;
 391
 392                 s2n(TLSEXT_TYPE_server_name,ret);
 393                 s2n(0,ret);
 394                 }
 395 #ifndef OPENSSL_NO_EC
 396         if (s->tlsext_ecpointformatlist != NULL)
 397                 {
 398                 /* Add TLS extension ECPointFormats to the ServerHello message */
 399                 long lenmax;
 400
 401                 if ((lenmax = limit - p - 5) < 0) return NULL;
 402                 if (s->tlsext_ecpointformatlist_length > (unsigned long)lenmax) return NULL;
 403                 if (s->tlsext_ecpointformatlist_length > 255)
 404                         {
 405                         SSLerr(SSL_F_SSL_ADD_SERVERHELLO_TLSEXT, ERR_R_INTERNAL_ERROR);
 406                         return NULL;
 407                         }
 408
 409                 s2n(TLSEXT_TYPE_ec_point_formats,ret);
 410                 s2n(s->tlsext_ecpointformatlist_length + 1,ret);
 411                 *(ret++) = (unsigned char) s->tlsext_ecpointformatlist_length;
 412                 memcpy(ret, s->tlsext_ecpointformatlist, s->tlsext_ecpointformatlist_length);
 413                 ret+=s->tlsext_ecpointformatlist_length;
 414
 415                 }
 416         /* Currently the server should not respond with a SupportedCurves extension */
 417 #endif /* OPENSSL_NO_EC */
 418
 419         if (s->tlsext_ticket_expected
 420                 && !(SSL_get_options(s) & SSL_OP_NO_TICKET))
 421                 {
 422                 if (limit - p - 4 < 0) return NULL;
 423                 s2n(TLSEXT_TYPE_session_ticket,ret);
 424                 s2n(0,ret);
 425                 }
 426
 427         if ((extdatalen = ret-p-2)== 0)
 428                 return p;
 429
 430         s2n(extdatalen,p);
 431         return ret;
 432         }
 433
 434 int ssl_parse_clienthello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 435         {
 436         unsigned short type;
 437         unsigned short size;
 438         unsigned short len;
 439         unsigned char *data = *p;
 440         s->servername_done = 0;
 441
 442         if (data >= (d+n-2))
 443                 return 1;
 444         n2s(data,len);
 445
 446         if (data > (d+n-len))
 447                 return 1;
 448
 449         while (data <= (d+n-4))
 450                 {
 451                 n2s(data,type);
 452                 n2s(data,size);
 453
 454                 if (data+size > (d+n))
 455                         return 1;
 456
 457                 if (s->tlsext_debug_cb)
 458                         s->tlsext_debug_cb(s, 0, type, data, size,
 459                                                 s->tlsext_debug_arg);
 460 /* The servername extension is treated as follows:
 461
 462    - Only the hostname type is supported with a maximum length of 255.
 463    - The servername is rejected if too long or if it contains zeros,
 464      in which case an fatal alert is generated.
 465    - The servername field is maintained together with the session cache.
 466    - When a session is resumed, the servername call back invoked in order
 467      to allow the application to position itself to the right context.
 468    - The servername is acknowledged if it is new for a session or when
 469      it is identical to a previously used for the same session.
 470      Applications can control the behaviour.  They can at any time
 471      set a 'desirable' servername for a new SSL object. This can be the
 472      case for example with HTTPS when a Host: header field is received and
 473      a renegotiation is requested. In this case, a possible servername
 474      presented in the new client hello is only acknowledged if it matches
 475      the value of the Host: field.
 476    - Applications must  use SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
 477      if they provide for changing an explicit servername context for the session,
 478      i.e. when the session has been established with a servername extension.
 479    - On session reconnect, the servername extension may be absent.
 480
 481 */
 482
 483                 if (type == TLSEXT_TYPE_server_name)
 484                         {
 485                         unsigned char *sdata;
 486                         int servname_type;
 487                         int dsize;
 488
 489                         if (size < 2)
 490                                 {
 491                                 *al = SSL_AD_DECODE_ERROR;
 492                                 return 0;
 493                                 }
 494                         n2s(data,dsize);
 495                         size -= 2;
 496                         if (dsize > size  )
 497                                 {
 498                                 *al = SSL_AD_DECODE_ERROR;
 499                                 return 0;
 500                                 }
 501
 502                         sdata = data;
 503                         while (dsize > 3)
 504                                 {
 505                                 servname_type = *(sdata++);
 506                                 n2s(sdata,len);
 507                                 dsize -= 3;
 508
 509                                 if (len > dsize)
 510                                         {
 511                                         *al = SSL_AD_DECODE_ERROR;
 512                                         return 0;
 513                                         }
 514                                 if (s->servername_done == 0)
 515                                 switch (servname_type)
 516                                         {
 517                                 case TLSEXT_NAMETYPE_host_name:
 518                                         if (s->session->tlsext_hostname == NULL)
 519                                                 {
 520                                                 if (len > TLSEXT_MAXLEN_host_name ||
 521                                                         ((s->session->tlsext_hostname = OPENSSL_malloc(len+1)) == NULL))
 522                                                         {
 523                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 524                                                         return 0;
 525                                                         }
 526                                                 memcpy(s->session->tlsext_hostname, sdata, len);
 527                                                 s->session->tlsext_hostname[len]='\0';
 528                                                 if (strlen(s->session->tlsext_hostname) != len) {
 529                                                         OPENSSL_free(s->session->tlsext_hostname);
 530                                                         *al = TLS1_AD_UNRECOGNIZED_NAME;
 531                                                         return 0;
 532                                                 }
 533                                                 s->servername_done = 1;
 534
 535                                                 }
 536                                         else
 537                                                 s->servername_done = strlen(s->session->tlsext_hostname) == len
 538                                                         && strncmp(s->session->tlsext_hostname, (char *)sdata, len) == 0;
 539
 540                                         break;
 541
 542                                 default:
 543                                         break;
 544                                         }
 545
 546                                 dsize -= len;
 547                                 }
 548                         if (dsize != 0)
 549                                 {
 550                                 *al = SSL_AD_DECODE_ERROR;
 551                                 return 0;
 552                                 }
 553
 554                         }
 555
 556 #ifndef OPENSSL_NO_EC
 557                 else if (type == TLSEXT_TYPE_ec_point_formats)
 558                         {
 559                         unsigned char *sdata = data;
 560                         int ecpointformatlist_length = *(sdata++);
 561
 562                         if (ecpointformatlist_length != size - 1)
 563                                 {
 564                                 *al = TLS1_AD_DECODE_ERROR;
 565                                 return 0;
 566                                 }
 567                         s->session->tlsext_ecpointformatlist_length = 0;
 568                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 569                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 570                                 {
 571                                 *al = TLS1_AD_INTERNAL_ERROR;
 572                                 return 0;
 573                                 }
 574                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 575                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 576 #if 0
 577                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ecpointformatlist (length=%i) ", s->session->tlsext_ecpointformatlist_length);
 578                         sdata = s->session->tlsext_ecpointformatlist;
 579                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 580                                 fprintf(stderr,"%i ",*(sdata++));
 581                         fprintf(stderr,"\n");
 582 #endif
 583                         }
 584                 else if (type == TLSEXT_TYPE_elliptic_curves)
 585                         {
 586                         unsigned char *sdata = data;
 587                         int ellipticcurvelist_length = (*(sdata++) << 8);
 588                         ellipticcurvelist_length += (*(sdata++));
 589
 590                         if (ellipticcurvelist_length != size - 2)
 591                                 {
 592                                 *al = TLS1_AD_DECODE_ERROR;
 593                                 return 0;
 594                                 }
 595                         s->session->tlsext_ellipticcurvelist_length = 0;
 596                         if (s->session->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->session->tlsext_ellipticcurvelist);
 597                         if ((s->session->tlsext_ellipticcurvelist = OPENSSL_malloc(ellipticcurvelist_length)) == NULL)
 598                                 {
 599                                 *al = TLS1_AD_INTERNAL_ERROR;
 600                                 return 0;
 601                                 }
 602                         s->session->tlsext_ellipticcurvelist_length = ellipticcurvelist_length;
 603                         memcpy(s->session->tlsext_ellipticcurvelist, sdata, ellipticcurvelist_length);
 604 #if 0
 605                         fprintf(stderr,"ssl_parse_clienthello_tlsext s->session->tlsext_ellipticcurvelist (length=%i) ", s->session->tlsext_ellipticcurvelist_length);
 606                         sdata = s->session->tlsext_ellipticcurvelist;
 607                         for (i = 0; i < s->session->tlsext_ellipticcurvelist_length; i++)
 608                                 fprintf(stderr,"%i ",*(sdata++));
 609                         fprintf(stderr,"\n");
 610 #endif
 611                         }
 612 #endif /* OPENSSL_NO_EC */
 613                 /* session ticket processed earlier */
 614                 data+=size;
 615                 }
 616
 617         *p = data;
 618         return 1;
 619         }
 620
 621 int ssl_parse_serverhello_tlsext(SSL *s, unsigned char **p, unsigned char *d, int n, int *al)
 622         {
 623         unsigned short type;
 624         unsigned short size;
 625         unsigned short len;
 626         unsigned char *data = *p;
 627
 628         int tlsext_servername = 0;
 629
 630         if (data >= (d+n-2))
 631                 return 1;
 632
 633         n2s(data,len);
 634
 635         while(data <= (d+n-4))
 636                 {
 637                 n2s(data,type);
 638                 n2s(data,size);
 639
 640                 if (data+size > (d+n))
 641                         return 1;
 642
 643                 if (s->tlsext_debug_cb)
 644                         s->tlsext_debug_cb(s, 1, type, data, size,
 645                                                 s->tlsext_debug_arg);
 646
 647                 if (type == TLSEXT_TYPE_server_name)
 648                         {
 649                         if (s->tlsext_hostname == NULL || size > 0)
 650                                 {
 651                                 *al = TLS1_AD_UNRECOGNIZED_NAME;
 652                                 return 0;
 653                                 }
 654                         tlsext_servername = 1;
 655                         }
 656
 657 #ifndef OPENSSL_NO_EC
 658                 else if (type == TLSEXT_TYPE_ec_point_formats)
 659                         {
 660                         unsigned char *sdata = data;
 661                         int ecpointformatlist_length = *(sdata++);
 662
 663                         if (ecpointformatlist_length != size - 1)
 664                                 {
 665                                 *al = TLS1_AD_DECODE_ERROR;
 666                                 return 0;
 667                                 }
 668                         s->session->tlsext_ecpointformatlist_length = 0;
 669                         if (s->session->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->session->tlsext_ecpointformatlist);
 670                         if ((s->session->tlsext_ecpointformatlist = OPENSSL_malloc(ecpointformatlist_length)) == NULL)
 671                                 {
 672                                 *al = TLS1_AD_INTERNAL_ERROR;
 673                                 return 0;
 674                                 }
 675                         s->session->tlsext_ecpointformatlist_length = ecpointformatlist_length;
 676                         memcpy(s->session->tlsext_ecpointformatlist, sdata, ecpointformatlist_length);
 677 #if 0
 678                         fprintf(stderr,"ssl_parse_serverhello_tlsext s->session->tlsext_ecpointformatlist ");
 679                         sdata = s->session->tlsext_ecpointformatlist;
 680                         for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 681                                 fprintf(stderr,"%i ",*(sdata++));
 682                         fprintf(stderr,"\n");
 683 #endif
 684                         }
 685 #endif /* OPENSSL_NO_EC */
 686
 687                 else if (type == TLSEXT_TYPE_session_ticket)
 688                         {
 689                         if ((SSL_get_options(s) & SSL_OP_NO_TICKET)
 690                                 || (size > 0))
 691                                 {
 692                                 *al = TLS1_AD_UNSUPPORTED_EXTENSION;
 693                                 return 0;
 694                                 }
 695                         s->tlsext_ticket_expected = 1;
 696                         }
 697                 data+=size;
 698                 }
 699
 700         if (data != d+n)
 701                 {
 702                 *al = SSL_AD_DECODE_ERROR;
 703                 return 0;
 704                 }
 705
 706         if (!s->hit && tlsext_servername == 1)
 707                 {
 708                 if (s->tlsext_hostname)
 709                         {
 710                         if (s->session->tlsext_hostname == NULL)
 711                                 {
 712                                 s->session->tlsext_hostname = BUF_strdup(s->tlsext_hostname);
 713                                 if (!s->session->tlsext_hostname)
 714                                         {
 715                                         *al = SSL_AD_UNRECOGNIZED_NAME;
 716                                         return 0;
 717                                         }
 718                                 }
 719                         else
 720                                 {
 721                                 *al = SSL_AD_DECODE_ERROR;
 722                                 return 0;
 723                                 }
 724                         }
 725                 }
 726
 727         *p = data;
 728         return 1;
 729         }
 730
 731
 732 int ssl_prepare_clienthello_tlsext(SSL *s)
 733         {
 734 #ifndef OPENSSL_NO_EC
 735         /* If we are client and using an elliptic curve cryptography cipher suite, send the point formats
 736          * and elliptic curves we support.
 737          */
 738         int using_ecc = 0;
 739         int i;
 740         unsigned char *j;
 741         unsigned long alg_k, alg_a;
 742         STACK_OF(SSL_CIPHER) *cipher_stack = SSL_get_ciphers(s);
 743
 744         for (i = 0; i < sk_SSL_CIPHER_num(cipher_stack); i++)
 745                 {
 746                 SSL_CIPHER *c = sk_SSL_CIPHER_value(cipher_stack, i);
 747
 748                 alg_k = c->algorithm_mkey;
 749                 alg_a = c->algorithm_auth;
 750                 if ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe) || (alg_a & SSL_aECDSA)))
 751                         {
 752                         using_ecc = 1;
 753                         break;
 754                         }
 755                 }
 756         using_ecc = using_ecc && (s->version == TLS1_VERSION);
 757         if (using_ecc)
 758                 {
 759                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 760                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 761                         {
 762                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 763                         return -1;
 764                         }
 765                 s->tlsext_ecpointformatlist_length = 3;
 766                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 767                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 768                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 769
 770                 /* we support all named elliptic curves in draft-ietf-tls-ecc-12 */
 771                 if (s->tlsext_ellipticcurvelist != NULL) OPENSSL_free(s->tlsext_ellipticcurvelist);
 772                 s->tlsext_ellipticcurvelist_length = sizeof(nid_list)/sizeof(nid_list[0]) * 2;
 773                 if ((s->tlsext_ellipticcurvelist = OPENSSL_malloc(s->tlsext_ellipticcurvelist_length)) == NULL)
 774                         {
 775                         s->tlsext_ellipticcurvelist_length = 0;
 776                         SSLerr(SSL_F_SSL_PREPARE_CLIENTHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 777                         return -1;
 778                         }
 779                 for (i = 1, j = s->tlsext_ellipticcurvelist; i <= sizeof(nid_list)/sizeof(nid_list[0]); i++)
 780                         s2n(i,j);
 781                 }
 782 #endif /* OPENSSL_NO_EC */
 783         return 1;
 784         }
 785
 786 int ssl_prepare_serverhello_tlsext(SSL *s)
 787         {
 788 #ifndef OPENSSL_NO_EC
 789         /* If we are server and using an ECC cipher suite, send the point formats we support
 790          * if the client sent us an ECPointsFormat extension.  Note that the server is not
 791          * supposed to send an EllipticCurves extension.
 792          */
 793
 794         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 795         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 796         int using_ecc = (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA);
 797         using_ecc = using_ecc && (s->session->tlsext_ecpointformatlist != NULL);
 798
 799         if (using_ecc)
 800                 {
 801                 if (s->tlsext_ecpointformatlist != NULL) OPENSSL_free(s->tlsext_ecpointformatlist);
 802                 if ((s->tlsext_ecpointformatlist = OPENSSL_malloc(3)) == NULL)
 803                         {
 804                         SSLerr(SSL_F_SSL_PREPARE_SERVERHELLO_TLSEXT,ERR_R_MALLOC_FAILURE);
 805                         return -1;
 806                         }
 807                 s->tlsext_ecpointformatlist_length = 3;
 808                 s->tlsext_ecpointformatlist[0] = TLSEXT_ECPOINTFORMAT_uncompressed;
 809                 s->tlsext_ecpointformatlist[1] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime;
 810                 s->tlsext_ecpointformatlist[2] = TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2;
 811                 }
 812 #endif /* OPENSSL_NO_EC */
 813         return 1;
 814         }
 815
 816 int ssl_check_clienthello_tlsext(SSL *s)
 817         {
 818         int ret=SSL_TLSEXT_ERR_NOACK;
 819         int al = SSL_AD_UNRECOGNIZED_NAME;
 820
 821 #ifndef OPENSSL_NO_EC
 822         /* The handling of the ECPointFormats extension is done elsewhere, namely in
 823          * ssl3_choose_cipher in s3_lib.c.
 824          */
 825         /* The handling of the EllipticCurves extension is done elsewhere, namely in
 826          * ssl3_choose_cipher in s3_lib.c.
 827          */
 828 #endif
 829
 830         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 831                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 832         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 833                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 834
 835         switch (ret)
 836                 {
 837                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 838                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 839                         return -1;
 840
 841                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 842                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 843                         return 1;
 844
 845                 case SSL_TLSEXT_ERR_NOACK:
 846                         s->servername_done=0;
 847                         default:
 848                 return 1;
 849                 }
 850         }
 851
 852 int ssl_check_serverhello_tlsext(SSL *s)
 853         {
 854         int ret=SSL_TLSEXT_ERR_NOACK;
 855         int al = SSL_AD_UNRECOGNIZED_NAME;
 856
 857 #ifndef OPENSSL_NO_EC
 858         /* If we are client and using an elliptic curve cryptography cipher suite, then server
 859          * must return a an EC point formats lists containing uncompressed.
 860          */
 861         unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 862         unsigned long alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 863         if ((s->tlsext_ecpointformatlist != NULL) && (s->tlsext_ecpointformatlist_length > 0) &&
 864             ((alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe)) || (alg_a & SSL_aECDSA)))
 865                 {
 866                 /* we are using an ECC cipher */
 867                 size_t i;
 868                 unsigned char *list;
 869                 int found_uncompressed = 0;
 870                 if ((s->session->tlsext_ecpointformatlist == NULL) || (s->session->tlsext_ecpointformatlist_length == 0))
 871                         {
 872                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 873                         return -1;
 874                         }
 875                 list = s->session->tlsext_ecpointformatlist;
 876                 for (i = 0; i < s->session->tlsext_ecpointformatlist_length; i++)
 877                         {
 878                         if (*(list++) == TLSEXT_ECPOINTFORMAT_uncompressed)
 879                                 {
 880                                 found_uncompressed = 1;
 881                                 break;
 882                                 }
 883                         }
 884                 if (!found_uncompressed)
 885                         {
 886                         SSLerr(SSL_F_SSL_CHECK_SERVERHELLO_TLSEXT,SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
 887                         return -1;
 888                         }
 889                 }
 890         ret = SSL_TLSEXT_ERR_OK;
 891 #endif /* OPENSSL_NO_EC */
 892
 893         if (s->ctx != NULL && s->ctx->tlsext_servername_callback != 0)
 894                 ret = s->ctx->tlsext_servername_callback(s, &al, s->ctx->tlsext_servername_arg);
 895         else if (s->initial_ctx != NULL && s->initial_ctx->tlsext_servername_callback != 0)
 896                 ret = s->initial_ctx->tlsext_servername_callback(s, &al, s->initial_ctx->tlsext_servername_arg);
 897
 898         switch (ret)
 899                 {
 900                 case SSL_TLSEXT_ERR_ALERT_FATAL:
 901                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 902                         return -1;
 903
 904                 case SSL_TLSEXT_ERR_ALERT_WARNING:
 905                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 906                         return 1;
 907
 908                 case SSL_TLSEXT_ERR_NOACK:
 909                         s->servername_done=0;
 910                         default:
 911                 return 1;
 912                 }
 913         }
 914
 915 /* Since the server cache lookup is done early on in the processing of client
 916  * hello and other operations depend on the result we need to handle any TLS
 917  * session ticket extension at the same time.
 918  */
 919
 920 int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
 921                                 const unsigned char *limit, SSL_SESSION **ret)
 922         {
 923         /* Point after session ID in client hello */
 924         const unsigned char *p = session_id + len;
 925         unsigned short i;
 926         if ((s->version <= SSL3_VERSION) || !limit)
 927                 return 1;
 928         if (p >= limit)
 929                 return -1;
 930         /* Skip past cipher list */
 931         n2s(p, i);
 932         p+= i;
 933         if (p >= limit)
 934                 return -1;
 935         /* Skip past compression algorithm list */
 936         i = *(p++);
 937         p += i;
 938         if (p > limit)
 939                 return -1;
 940         /* Now at start of extensions */
 941         if ((p + 2) >= limit)
 942                 return 1;
 943         n2s(p, i);
 944         while ((p + 4) <= limit)
 945                 {
 946                 unsigned short type, size;
 947                 n2s(p, type);
 948                 n2s(p, size);
 949                 if (p + size > limit)
 950                         return 1;
 951                 if (type == TLSEXT_TYPE_session_ticket)
 952                         {
 953                         /* If tickets disabled indicate cache miss which will
 954                          * trigger a full handshake
 955                          */
 956                         if (SSL_get_options(s) & SSL_OP_NO_TICKET)
 957                                 return 0;
 958                         /* If zero length not client will accept a ticket
 959                          * and indicate cache miss to trigger full handshake
 960                          */
 961                         if (size == 0)
 962                                 {
 963                                 s->tlsext_ticket_expected = 1;
 964                                 return 0;       /* Cache miss */
 965                                 }
 966                         return tls_decrypt_ticket(s, p, size, session_id, len,
 967                                                                         ret);
 968                         }
 969                 p += size;
 970                 }
 971         return 1;
 972         }
 973
 974 static int tls_decrypt_ticket(SSL *s, const unsigned char *etick, int eticklen,
 975                                 const unsigned char *sess_id, int sesslen,
 976                                 SSL_SESSION **psess)
 977         {
 978         SSL_SESSION *sess;
 979         unsigned char *sdec;
 980         const unsigned char *p;
 981         int slen, mlen;
 982         unsigned char tick_hmac[EVP_MAX_MD_SIZE];
 983         HMAC_CTX hctx;
 984         EVP_CIPHER_CTX ctx;
 985         /* Attempt to process session ticket, first conduct sanity and
 986          * integrity checks on ticket.
 987          */
 988         mlen = EVP_MD_size(EVP_sha1());
 989         eticklen -= mlen;
 990         /* Need at least keyname + iv + some encrypted data */
 991         if (eticklen < 48)
 992                 goto tickerr;
 993         /* Check key name matches */
 994         if (memcmp(etick, s->ctx->tlsext_tick_key_name, 16))
 995                 goto tickerr;
 996         /* Check HMAC of encrypted ticket */
 997         HMAC_CTX_init(&hctx);
 998         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
 999                                 EVP_sha1(), NULL);
1000         HMAC_Update(&hctx, etick, eticklen);
1001         HMAC_Final(&hctx, tick_hmac, NULL);
1002         HMAC_CTX_cleanup(&hctx);
1003         if (memcmp(tick_hmac, etick + eticklen, mlen))
1004                 goto tickerr;
1005         /* Set p to start of IV */
1006         p = etick + 16;
1007         EVP_CIPHER_CTX_init(&ctx);
1008         /* Attempt to decrypt session data */
1009         EVP_DecryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1010                                         s->ctx->tlsext_tick_aes_key, p);
1011         /* Move p after IV to start of encrypted ticket, update length */
1012         p += 16;
1013         eticklen -= 32;
1014         sdec = OPENSSL_malloc(eticklen);
1015         if (!sdec)
1016                 {
1017                 EVP_CIPHER_CTX_cleanup(&ctx);
1018                 return -1;
1019                 }
1020         EVP_DecryptUpdate(&ctx, sdec, &slen, p, eticklen);
1021         if (EVP_DecryptFinal(&ctx, sdec + slen, &mlen) <= 0)
1022                 goto tickerr;
1023         slen += mlen;
1024         EVP_CIPHER_CTX_cleanup(&ctx);
1025         p = sdec;
1026
1027         sess = d2i_SSL_SESSION(NULL, &p, slen);
1028         OPENSSL_free(sdec);
1029         if (sess)
1030                 {
1031                 /* The session ID if non-empty is used by some clients to
1032                  * detect that the ticket has been accepted. So we copy it to
1033                  * the session structure. If it is empty set length to zero
1034                  * as required by standard.
1035                  */
1036                 if (sesslen)
1037                         memcpy(sess->session_id, sess_id, sesslen);
1038                 sess->session_id_length = sesslen;
1039                 *psess = sess;
1040                 return 1;
1041                 }
1042         /* If session decrypt failure indicate a cache miss and set state to
1043          * send a new ticket
1044          */
1045         tickerr:
1046         s->tlsext_ticket_expected = 1;
1047         return 0;
1048         }
1049
1050 #endif