crypto/external/bsd/heimdal/dist/kdc/misc.c

   1 /*      $NetBSD: misc.c,v 1.1.1.2 2014/04/24 12:45:27 pettai Exp $      */
   2
   3 /*
   4  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "kdc_locl.h"
  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               krb5uint32 *kvno_ptr,
  46               HDB **db,
  47               hdb_entry_ex **h)
  48 {
  49     hdb_entry_ex *ent;
  50     krb5_error_code ret = HDB_ERR_NOENTRY;
  51     int i;
  52     unsigned kvno = 0;
  53
  54     if (kvno_ptr) {
  55             kvno = *kvno_ptr;
  56             flags |= HDB_F_KVNO_SPECIFIED;
  57     }
  58
  59     ent = calloc (1, sizeof (*ent));
  60     if (ent == NULL) {
  61         krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
  62         return ENOMEM;
  63     }
  64
  65     for(i = 0; i < config->num_db; i++) {
  66         krb5_principal enterprise_principal = NULL;
  67         if (!(config->db[i]->hdb_capability_flags & HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL)
  68             && principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
  69             if (principal->name.name_string.len != 1) {
  70                 ret = KRB5_PARSE_MALFORMED;
  71                 krb5_set_error_message(context, ret,
  72                                        "malformed request: "
  73                                        "enterprise name with %d name components",
  74                                        principal->name.name_string.len);
  75                 free(ent);
  76                 return ret;
  77             }
  78             ret = krb5_parse_name(context, principal->name.name_string.val[0],
  79                                   &enterprise_principal);
  80             if (ret) {
  81                 free(ent);
  82                 return ret;
  83             }
  84
  85             principal = enterprise_principal;
  86         }
  87
  88         ret = config->db[i]->hdb_open(context, config->db[i], O_RDONLY, 0);
  89         if (ret) {
  90             const char *msg = krb5_get_error_message(context, ret);
  91             kdc_log(context, config, 0, "Failed to open database: %s", msg);
  92             krb5_free_error_message(context, msg);
  93             continue;
  94         }
  95
  96         ret = config->db[i]->hdb_fetch_kvno(context,
  97                                             config->db[i],
  98                                             principal,
  99                                             flags | HDB_F_DECRYPT,
 100                                             kvno,
 101                                             ent);
 102
 103         krb5_free_principal(context, enterprise_principal);
 104
 105         config->db[i]->hdb_close(context, config->db[i]);
 106         if(ret == 0) {
 107             if (db)
 108                 *db = config->db[i];
 109             *h = ent;
 110             return 0;
 111         }
 112     }
 113     free(ent);
 114     krb5_set_error_message(context, ret,
 115                            "no such entry found in hdb");
 116     return ret;
 117 }
 118
 119 void
 120 _kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
 121 {
 122     hdb_free_entry (context, ent);
 123     free (ent);
 124 }
 125
 126 /*
 127  * Use the order list of preferred encryption types and sort the
 128  * available keys and return the most preferred key.
 129  */
 130
 131 krb5_error_code
 132 _kdc_get_preferred_key(krb5_context context,
 133                        krb5_kdc_configuration *config,
 134                        hdb_entry_ex *h,
 135                        const char *name,
 136                        krb5_enctype *enctype,
 137                        Key **key)
 138 {
 139     krb5_error_code ret;
 140     int i;
 141
 142     if (config->use_strongest_server_key) {
 143         const krb5_enctype *p = krb5_kerberos_enctypes(context);
 144
 145         for (i = 0; p[i] != (krb5_enctype)ETYPE_NULL; i++) {
 146             if (krb5_enctype_valid(context, p[i]) != 0 &&
 147                 !_kdc_is_weak_exception(h->entry.principal, p[i]))
 148                 continue;
 149             ret = hdb_enctype2key(context, &h->entry, p[i], key);
 150             if (ret != 0)
 151                 continue;
 152             if (enctype != NULL)
 153                 *enctype = p[i];
 154             return 0;
 155         }
 156     } else {
 157         *key = NULL;
 158
 159         for (i = 0; i < h->entry.keys.len; i++) {
 160             if (krb5_enctype_valid(context, h->entry.keys.val[i].key.keytype) != 0 &&
 161                 !_kdc_is_weak_exception(h->entry.principal, h->entry.keys.val[i].key.keytype))
 162                 continue;
 163             ret = hdb_enctype2key(context, &h->entry,
 164                 h->entry.keys.val[i].key.keytype, key);
 165             if (ret != 0)
 166                 continue;
 167             if (enctype != NULL)
 168                 *enctype = (*key)->key.keytype;
 169             return 0;
 170         }
 171     }
 172
 173     krb5_set_error_message(context, EINVAL,
 174                            "No valid kerberos key found for %s", name);
 175     return EINVAL; /* XXX */
 176 }
 177