lib/kadm5/keys.c

   1 /*
   2  * Copyright (c) 1997 - 2000 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 "kadm5_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 /*
  39  * free all the memory used by (len, keys)
  40  */
  41
  42 void
  43 _kadm5_free_keys (krb5_context context,
  44                   int len, Key *keys)
  45 {
  46     hdb_free_keys(context, len, keys);
  47 }
  48
  49 /*
  50  * null-ify `len', `keys'
  51  */
  52
  53 void
  54 _kadm5_init_keys (Key *keys, int len)
  55 {
  56     int i;
  57
  58     for (i = 0; i < len; ++i) {
  59         keys[i].mkvno               = NULL;
  60         keys[i].salt                = NULL;
  61         keys[i].key.keyvalue.length = 0;
  62         keys[i].key.keyvalue.data   = NULL;
  63     }
  64 }
  65
  66
  67 /*
  68  * return 1 if any key in `keys1, len1' exists in `keys2, len2'
  69  */
  70 static int
  71 _kadm5_exists_keys(Key *keys1, int len1, Key *keys2, int len2)
  72 {
  73     size_t i, j;
  74     size_t optimize;
  75
  76     for (i = 0; i < len1; ++i) {
  77         optimize = 0;
  78         for (j = 0; j < len2; j++) {
  79             if ((keys1[i].salt != NULL && keys2[j].salt == NULL)
  80                 || (keys1[i].salt == NULL && keys2[j].salt != NULL))
  81                 continue;
  82
  83             if (keys1[i].salt != NULL) {
  84                 if (keys1[i].salt->type != keys2[j].salt->type)
  85                     continue;
  86                 if (keys1[i].salt->salt.length != keys2[j].salt->salt.length)
  87                     continue;
  88                 if (memcmp (keys1[i].salt->salt.data, keys2[j].salt->salt.data,
  89                             keys1[i].salt->salt.length) != 0)
  90                     continue;
  91             }
  92             if (keys1[i].key.keytype != keys2[j].key.keytype)
  93                 continue;
  94             optimize = 1;
  95             if (keys1[i].key.keyvalue.length != keys2[j].key.keyvalue.length)
  96                 continue;
  97             if (memcmp (keys1[i].key.keyvalue.data, keys2[j].key.keyvalue.data,
  98                         keys1[i].key.keyvalue.length) != 0)
  99                 continue;
 100
 101             return 1;
 102         }
 103
 104         /*
 105          * Optimization: no need to check all of keys1[] if one there
 106          * was one key in keys2[] with matching enctype and salt but not
 107          * matching key.  Assumption: all keys in keys1[] and keys2[]
 108          * are output by string2key.
 109          */
 110         if (optimize)
 111             return 0;
 112     }
 113     return 0;
 114 }
 115
 116 /*
 117  * return 1 if any key in `keys1, len1' exists in hist_keys
 118  */
 119 int
 120 _kadm5_exists_keys_hist(Key *keys1, int len1, HDB_Ext_KeySet *hist_keys)
 121 {
 122     size_t i;
 123
 124     for (i = 0; i < hist_keys->len; i++) {
 125         if (_kadm5_exists_keys(keys1, len1,
 126                                hist_keys->val[i].keys.val,
 127                                hist_keys->val[i].keys.len))
 128             return 1;
 129     }
 130
 131     return 0;
 132 }