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 struct timeval _kdc_now;
  37
  38 krb5_error_code
  39 _kdc_db_fetch(krb5_context context,
  40               krb5_kdc_configuration *config,
  41               krb5_const_principal principal,
  42               unsigned flags,
  43               HDB **db,
  44               hdb_entry_ex **h)
  45 {
  46     hdb_entry_ex *ent;
  47     krb5_error_code ret;
  48     int i;
  49
  50     ent = calloc (1, sizeof (*ent));
  51     if (ent == NULL) {
  52         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
  53         return ENOMEM;
  54     }
  55
  56     for(i = 0; i < config->num_db; i++) {
  57         krb5_principal enterprise_principal = NULL;
  58         if (!(config->db[i]->hdb_capability_flags & HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL)
  59             && principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
  60             if (principal->name.name_string.len != 1) {
  61                 ret = KRB5_PARSE_MALFORMED;
  62                 krb5_set_error_message(context, ret,
  63                                        "malformed request: "
  64                                        "enterprise name with %d name components",
  65                                        principal->name.name_string.len);
  66                 free(ent);
  67                 return ret;
  68             }
  69             ret = krb5_parse_name(context, principal->name.name_string.val[0],
  70                                   &enterprise_principal);
  71             if (ret) {
  72                 free(ent);
  73                 return ret;
  74             }
  75
  76             principal = enterprise_principal;
  77         }
  78
  79         ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
  80         if (ret) {
  81             const char *msg = krb5_get_error_message(context, ret);
  82             kdc_log(context, config, 0, "Failed to open database: %s", msg);
  83             krb5_free_error_message(context, msg);
  84             continue;
  85         }
  86
  87         ret = config->db[i]->hdb_fetch(context,
  88                                        config->db[i],
  89                                        principal,
  90                                        flags | HDB_F_DECRYPT,
  91                                        ent);
  92         krb5_free_principal(context, enterprise_principal);
  93
  94         config->db[i]->hdb_close(context, config->db[i]);
  95         if(ret == 0) {
  96             if (db)
  97                 *db = config->db[i];
  98             *h = ent;
  99             return 0;
 100         }
 101     }
 102     free(ent);
 103     krb5_set_error_message(context, HDB_ERR_NOENTRY,
 104                            "no such entry found in hdb");
 105     return HDB_ERR_NOENTRY;
 106 }
 107
 108 void
 109 _kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
 110 {
 111     hdb_free_entry (context, ent);
 112     free (ent);
 113 }
 114
 115 /*
 116  * Use the order list of preferred encryption types and sort the
 117  * available keys and return the most preferred key.
 118  */
 119
 120 krb5_error_code
 121 _kdc_get_preferred_key(krb5_context context,
 122                        krb5_kdc_configuration *config,
 123                        hdb_entry_ex *h,
 124                        const char *name,
 125                        krb5_enctype *enctype,
 126                        Key **key)
 127 {
 128     const krb5_enctype *p;
 129     krb5_error_code ret;
 130     int i;
 131
 132     p = krb5_kerberos_enctypes(context);
 133
 134     for (i = 0; p[i] != ETYPE_NULL; i++) {
 135         if (krb5_enctype_valid(context, p[i]) != 0)
 136             continue;
 137         ret = hdb_enctype2key(context, &h->entry, p[i], key);
 138         if (ret == 0) {
 139             *enctype = p[i];
 140             return 0;
 141         }
 142     }
 143
 144     krb5_set_error_message(context, EINVAL,
 145                            "No valid kerberos key found for %s", name);
 146     return EINVAL;
 147 }
 148