misc.c revision 178826 
1/*
2 * Copyright (c) 1997 - 2001 Kungliga Tekniska H�gskolan
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
36RCSID("$Id: misc.c 21106 2007-06-18 10:18:11Z lha $");
37
38struct timeval _kdc_now;
39
40krb5_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
83void
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
95krb5_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
123