kdc/misc.c

   1 /*
   2  * Copyright (c) 1997 - 2001 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 "kdc_locl.h"
  35
  36 RCSID("$Id$");
  37
  38 struct timeval _kdc_now;
  39
  40 krb5_error_code
  41 _kdc_db_fetch(krb5_context context,
  42               krb5_kdc_configuration *config,
  43               krb5_const_principal principal,
  44               unsigned flags,
  45               HDB **db,
  46               hdb_entry_ex **h)
  47 {
  48     hdb_entry_ex *ent;
  49     krb5_error_code ret;
  50     int i;
  51
  52     ent = calloc (1, sizeof (*ent));
  53     if (ent == NULL) {
  54         krb5_set_error_string(context, "out of memory");
  55         return ENOMEM;
  56     }
  57
  58     for(i = 0; i < config->num_db; i++) {
  59         ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
  60         if (ret) {
  61             kdc_log(context, config, 0, "Failed to open database: %s",
  62                     krb5_get_err_text(context, ret));
  63             continue;
  64         }
  65         ret = config->db[i]->hdb_fetch(context,
  66                                        config->db[i],
  67                                        principal,
  68                                        flags | HDB_F_DECRYPT,
  69                                        ent);
  70         config->db[i]->hdb_close(context, config->db[i]);
  71         if(ret == 0) {
  72             if (db)
  73                 *db = config->db[i];
  74             *h = ent;
  75             return 0;
  76         }
  77     }
  78     free(ent);
  79     krb5_set_error_string(context, "no such entry found in hdb");
  80     return  HDB_ERR_NOENTRY;
  81 }
  82
  83 void
  84 _kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
  85 {
  86     hdb_free_entry (context, ent);
  87     free (ent);
  88 }
  89
  90 /*
  91  * Use the order list of preferred encryption types and sort the
  92  * available keys and return the most preferred key.
  93  */
  94
  95 krb5_error_code
  96 _kdc_get_preferred_key(krb5_context context,
  97                        krb5_kdc_configuration *config,
  98                        hdb_entry_ex *h,
  99                        const char *name,
 100                        krb5_enctype *enctype,
 101                        Key **key)
 102 {
 103     const krb5_enctype *p;
 104     krb5_error_code ret;
 105     int i;
 106
 107     p = krb5_kerberos_enctypes(context);
 108
 109     for (i = 0; p[i] != ETYPE_NULL; i++) {
 110         if (krb5_enctype_valid(context, p[i]) != 0)
 111             continue;
 112         ret = hdb_enctype2key(context, &h->entry, p[i], key);
 113         if (ret == 0) {
 114             *enctype = p[i];
 115             return 0;
 116         }
 117     }
 118
 119     krb5_set_error_string(context, "No valid kerberos key found for %s", name);
 120     return EINVAL;
 121 }
 122