1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /* lib/krb5/keytab/read_servi.c */
3 /*
4 * Copyright 1990,2008 by the Massachusetts Institute of Technology.
5 * All Rights Reserved.
6 *
7 * Export of this software from the United States of America may
8 * require a specific license from the United States Government.
9 * It is the responsibility of any person or organization contemplating
10 * export to obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of M.I.T. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. Furthermore if you modify this software you must label
20 * your software as modified software and not distribute it in such a
21 * fashion that it might be confused with the original M.I.T. software.
22 * M.I.T. makes no representations about the suitability of
23 * this software for any purpose. It is provided "as is" without express
24 * or implied warranty.
25 */
26
27 /*
28 * This routine is designed to be passed to krb5_rd_req.
29 * It is a convenience function that reads a key out of a keytab.
30 * It handles all of the opening and closing of the keytab
31 * internally.
32 */
33 #ifndef LEAN_CLIENT
34
35 #include "k5-int.h"
36
37 #define KSUCCESS 0
38
39 /*
40 * effects: If keyprocarg is not NULL, it is taken to be the name of a
41 * keytab. Otherwise, the default keytab will be used. This
42 * routine opens the keytab and finds the principal associated with
43 * principal, vno, and enctype and returns the resulting key in *key
44 * or returning an error code if it is not found.
45 * returns: Either KSUCCESS or error code.
46 * errors: error code if not found or keyprocarg is invalid.
47 */
48 krb5_error_code KRB5_CALLCONV
krb5_kt_read_service_key(krb5_context context,krb5_pointer keyprocarg,krb5_principal principal,krb5_kvno vno,krb5_enctype enctype,krb5_keyblock ** key)49 krb5_kt_read_service_key(krb5_context context, krb5_pointer keyprocarg, krb5_principal principal, krb5_kvno vno, krb5_enctype enctype, krb5_keyblock **key)
50 {
51 krb5_error_code kerror = KSUCCESS;
52 char keytabname[MAX_KEYTAB_NAME_LEN + 1]; /* + 1 for NULL termination */
53 krb5_keytab id;
54 krb5_keytab_entry entry;
55
56 /*
57 * Get the name of the file that we should use.
58 */
59 if (!keyprocarg) {
60 if ((kerror = krb5_kt_default_name(context, (char *)keytabname,
61 sizeof(keytabname) - 1))!= KSUCCESS)
62 return (kerror);
63 } else {
64 memset(keytabname, 0, sizeof(keytabname));
65 (void) strncpy(keytabname, (char *)keyprocarg,
66 sizeof(keytabname) - 1);
67 }
68
69 if ((kerror = krb5_kt_resolve(context, (char *)keytabname, &id)))
70 return (kerror);
71
72 kerror = krb5_kt_get_entry(context, id, principal, vno, enctype, &entry);
73 krb5_kt_close(context, id);
74
75 if (kerror)
76 return(kerror);
77
78 krb5_copy_keyblock(context, &entry.key, key);
79
80 krb5_kt_free_entry(context, &entry);
81
82 return (KSUCCESS);
83 }
84 #endif /* LEAN_CLIENT */
85