Line data    Source code

       1             : /*
       2             :  * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Redistribution and use in source and binary forms, with or without
       7             :  * modification, are permitted provided that the following conditions
       8             :  * are met:
       9             :  *
      10             :  * 1. Redistributions of source code must retain the above copyright
      11             :  *    notice, this list of conditions and the following disclaimer.
      12             :  *
      13             :  * 2. Redistributions in binary form must reproduce the above copyright
      14             :  *    notice, this list of conditions and the following disclaimer in the
      15             :  *    documentation and/or other materials provided with the distribution.
      16             :  *
      17             :  * 3. Neither the name of the Institute nor the names of its contributors
      18             :  *    may be used to endorse or promote products derived from this software
      19             :  *    without specific prior written permission.
      20             :  *
      21             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      22             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      23             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      24             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      25             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      26             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      27             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      28             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      29             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      30             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      31             :  * SUCH DAMAGE.
      32             :  */
      33             : 
      34             : #include "krb5_locl.h"
      35             : 
      36             : const int _krb5_AES_SHA1_string_to_default_iterator = 4096;
      37             : 
      38             : static krb5_error_code
      39       86562 : AES_SHA1_string_to_key(krb5_context context,
      40             :                        krb5_enctype enctype,
      41             :                        krb5_data password,
      42             :                        krb5_salt salt,
      43             :                        krb5_data opaque,
      44             :                        krb5_keyblock *key)
      45             : {
      46        1640 :     krb5_error_code ret;
      47        1640 :     uint32_t iter;
      48        1640 :     struct _krb5_encryption_type *et;
      49        1640 :     struct _krb5_key_data kd;
      50             : 
      51       86562 :     if (opaque.length == 0)
      52       58782 :         iter = _krb5_AES_SHA1_string_to_default_iterator;
      53       27298 :     else if (opaque.length == 4) {
      54        1158 :         unsigned long v;
      55       27298 :         _krb5_get_int(opaque.data, &v, 4);
      56       27298 :         iter = ((uint32_t)v);
      57             :     } else
      58           0 :         return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
      59             : 
      60       86562 :     et = _krb5_find_enctype(enctype);
      61       86562 :     if (et == NULL)
      62           0 :         return KRB5_PROG_KEYTYPE_NOSUPP;
      63             : 
      64       86562 :     kd.schedule = NULL;
      65       86562 :     ALLOC(kd.key, 1);
      66       86562 :     if (kd.key == NULL)
      67           0 :         return krb5_enomem(context);
      68       86562 :     kd.key->keytype = enctype;
      69       86562 :     ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
      70       86562 :     if (ret) {
      71           0 :         krb5_set_error_message (context, ret, N_("malloc: out of memory", ""));
      72           0 :         return ret;
      73             :     }
      74             : 
      75      174764 :     ret = PKCS5_PBKDF2_HMAC(password.data, password.length,
      76       86562 :                             salt.saltvalue.data, salt.saltvalue.length,
      77             :                             iter,
      78             :                             EVP_sha1(),
      79       86562 :                             et->keytype->size, kd.key->keyvalue.data);
      80       86562 :     if (ret != 1) {
      81           0 :         _krb5_free_key_data(context, &kd, et);
      82           0 :         krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
      83             :                                "Error calculating s2k");
      84           0 :         return KRB5_PROG_KEYTYPE_NOSUPP;
      85             :     }
      86             : 
      87       86562 :     ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
      88       86562 :     if (ret == 0)
      89       86562 :         ret = krb5_copy_keyblock_contents(context, kd.key, key);
      90       86562 :     _krb5_free_key_data(context, &kd, et);
      91             : 
      92       86562 :     return ret;
      93             : }
      94             : 
      95             : struct salt_type _krb5_AES_SHA1_salt[] = {
      96             :     {
      97             :         KRB5_PW_SALT,
      98             :         "pw-salt",
      99             :         AES_SHA1_string_to_key
     100             :     },
     101             :     { 0, NULL, NULL }
     102             : };