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_SHA2_string_to_default_iterator = 32768;
      37             : 
      38             : static krb5_error_code
      39           0 : AES_SHA2_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           0 :     krb5_error_code ret;
      47           0 :     uint32_t iter;
      48           0 :     struct _krb5_encryption_type *et = NULL;
      49           0 :     struct _krb5_key_data kd;
      50           0 :     krb5_data saltp;
      51           0 :     size_t enctypesz;
      52           0 :     const EVP_MD *md = NULL;
      53             : 
      54           0 :     krb5_data_zero(&saltp);
      55           0 :     kd.key = NULL;
      56           0 :     kd.schedule = NULL;
      57             : 
      58           0 :     if (opaque.length == 0) {
      59           0 :         iter = _krb5_AES_SHA2_string_to_default_iterator;
      60           0 :     } else if (opaque.length == 4) {
      61           0 :         unsigned long v;
      62           0 :         _krb5_get_int(opaque.data, &v, 4);
      63           0 :         iter = ((uint32_t)v);
      64             :     } else {
      65           0 :         ret = KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
      66           0 :         goto cleanup;
      67             :     }
      68             : 
      69           0 :     et = _krb5_find_enctype(enctype);
      70           0 :     if (et == NULL) {
      71           0 :         ret = KRB5_PROG_KEYTYPE_NOSUPP;
      72           0 :         goto cleanup;
      73             :     }
      74             : 
      75           0 :     kd.schedule = NULL;
      76           0 :     ALLOC(kd.key, 1);
      77           0 :     if (kd.key == NULL) {
      78           0 :         ret = krb5_enomem(context);
      79           0 :         goto cleanup;
      80             :     }
      81           0 :     kd.key->keytype = enctype;
      82           0 :     ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
      83           0 :     if (ret) {
      84           0 :         ret = krb5_enomem(context);
      85           0 :         goto cleanup;
      86             :     }
      87             : 
      88           0 :     enctypesz = strlen(et->name) + 1;
      89           0 :     ret = krb5_data_alloc(&saltp, enctypesz + salt.saltvalue.length);
      90           0 :     if (ret) {
      91           0 :         ret = krb5_enomem(context);
      92           0 :         goto cleanup;
      93             :     }
      94           0 :     memcpy(saltp.data, et->name, enctypesz);
      95           0 :     if (salt.saltvalue.length)
      96           0 :         memcpy((unsigned char *)saltp.data + enctypesz,
      97           0 :                salt.saltvalue.data, salt.saltvalue.length);
      98             : 
      99           0 :     ret = _krb5_aes_sha2_md_for_enctype(context, enctype, &md);
     100           0 :     if (ret)
     101           0 :         goto cleanup;
     102             : 
     103           0 :     ret = PKCS5_PBKDF2_HMAC(password.data, password.length,
     104           0 :                             saltp.data, saltp.length,
     105             :                             iter, md,
     106           0 :                             et->keytype->size, kd.key->keyvalue.data);
     107           0 :     if (ret != 1) {
     108           0 :         krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
     109             :                                "Error calculating s2k");
     110           0 :         ret = KRB5_PROG_KEYTYPE_NOSUPP;
     111           0 :         goto cleanup;
     112             :     }
     113             : 
     114           0 :     ret = _krb5_derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
     115           0 :     if (ret)
     116           0 :         goto cleanup;
     117             : 
     118           0 :     ret = krb5_copy_keyblock_contents(context, kd.key, key);
     119           0 :     if (ret)
     120           0 :         goto cleanup;
     121             : 
     122           0 : cleanup:
     123           0 :     krb5_data_free(&saltp);
     124           0 :     _krb5_free_key_data(context, &kd, et);
     125             : 
     126           0 :     return ret;
     127             : }
     128             : 
     129             : struct salt_type _krb5_AES_SHA2_salt[] = {
     130             :     {
     131             :         KRB5_PW_SALT,
     132             :         "pw-salt",
     133             :         AES_SHA2_string_to_key
     134             :     },
     135             :     { 0, NULL, NULL }
     136             : };