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_message(context, ENOMEM, "malloc: out of memory");
  55         return ENOMEM;
  56     }
  57
  58     for(i = 0; i < config->num_db; i++) {
  59         krb5_principal enterprise_principal = NULL;
  60         if (!(config->db[i]->hdb_capability_flags & HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL)
  61             && principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
  62             if (principal->name.name_string.len != 1) {
  63                 ret = KRB5_PARSE_MALFORMED;
  64                 krb5_set_error_message(context, ret,
  65                                        "malformed request: "
  66                                        "enterprise name with %d name components",
  67                                        principal->name.name_string.len);
  68                 free(ent);
  69                 return ret;
  70             }
  71             ret = krb5_parse_name(context, principal->name.name_string.val[0],
  72                                   &enterprise_principal);
  73             if (ret) {
  74                 free(ent);
  75                 return ret;
  76             }
  77
  78             principal = enterprise_principal;
  79         }
  80
  81         ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
  82         if (ret) {
  83             const char *msg = krb5_get_error_message(context, ret);
  84             kdc_log(context, config, 0, "Failed to open database: %s", msg);
  85             krb5_free_error_message(context, msg);
  86             continue;
  87         }
  88
  89         ret = config->db[i]->hdb_fetch(context,
  90                                        config->db[i],
  91                                        principal,
  92                                        flags | HDB_F_DECRYPT,
  93                                        ent);
  94         krb5_free_principal(context, enterprise_principal);
  95
  96         config->db[i]->hdb_close(context, config->db[i]);
  97         if(ret == 0) {
  98             if (db)
  99                 *db = config->db[i];
 100             *h = ent;
 101             return 0;
 102         }
 103     }
 104     free(ent);
 105     krb5_set_error_message(context, HDB_ERR_NOENTRY,
 106                            "no such entry found in hdb");
 107     return HDB_ERR_NOENTRY;
 108 }
 109
 110 void
 111 _kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
 112 {
 113     hdb_free_entry (context, ent);
 114     free (ent);
 115 }
 116
 117 /*
 118  * Use the order list of preferred encryption types and sort the
 119  * available keys and return the most preferred key.
 120  */
 121
 122 krb5_error_code
 123 _kdc_get_preferred_key(krb5_context context,
 124                        krb5_kdc_configuration *config,
 125                        hdb_entry_ex *h,
 126                        const char *name,
 127                        krb5_enctype *enctype,
 128                        Key **key)
 129 {
 130     const krb5_enctype *p;
 131     krb5_error_code ret;
 132     int i;
 133
 134     p = krb5_kerberos_enctypes(context);
 135
 136     for (i = 0; p[i] != ETYPE_NULL; i++) {
 137         if (krb5_enctype_valid(context, p[i]) != 0)
 138             continue;
 139         ret = hdb_enctype2key(context, &h->entry, p[i], key);
 140         if (ret == 0) {
 141             *enctype = p[i];
 142             return 0;
 143         }
 144     }
 145
 146     krb5_set_error_message(context, EINVAL,
 147                            "No valid kerberos key found for %s", name);
 148     return EINVAL;
 149 }
 150