1 /*
2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 #pragma ident	"%Z%%M%	%I%	%E% SMI"
7 
8 /*
9  * lib/krb5/os/ktdefname.c
10  *
11  * Copyright 1990 by the Massachusetts Institute of Technology.
12  * All Rights Reserved.
13  *
14  * Export of this software from the United States of America may
15  *   require a specific license from the United States Government.
16  *   It is the responsibility of any person or organization contemplating
17  *   export to obtain such a license before exporting.
18  *
19  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
20  * distribute this software and its documentation for any purpose and
21  * without fee is hereby granted, provided that the above copyright
22  * notice appear in all copies and that both that copyright notice and
23  * this permission notice appear in supporting documentation, and that
24  * the name of M.I.T. not be used in advertising or publicity pertaining
25  * to distribution of the software without specific, written prior
26  * permission.  Furthermore if you modify this software you must label
27  * your software as modified software and not distribute it in such a
28  * fashion that it might be confused with the original M.I.T. software.
29  * M.I.T. makes no representations about the suitability of
30  * this software for any purpose.  It is provided "as is" without express
31  * or implied warranty.
32  *
33  *
34  * Return default keytab file name.
35  */
36 
37 #define NEED_WINDOWS
38 
39 #include <k5-int.h>
40 
41 extern char *krb5_defkeyname;
42 
43 /* this is a an exceedinly gross thing. */
44 char *krb5_overridekeyname = NULL;
45 
46 krb5_error_code KRB5_CALLCONV
47 krb5_kt_default_name(krb5_context context, char *name, int namesize)
48 {
49     char *cp = 0;
50     char *retval;
51 
52     if (krb5_overridekeyname) {
53 	if ((size_t) namesize < (strlen(krb5_overridekeyname)+1))
54 	    return KRB5_CONFIG_NOTENUFSPACE;
55 	strncpy(name, krb5_overridekeyname, namesize);
56     } else if ((context->profile_secure == FALSE) &&
57 	(cp = getenv("KRB5_KTNAME"))) {
58 	if ((size_t) namesize < (strlen(cp)+1))
59 	    return KRB5_CONFIG_NOTENUFSPACE;
60 	strncpy(name, cp, namesize);
61     } else if ((profile_get_string(context->profile,
62 					   "libdefaults",
63 					   "default_keytab_name", NULL,
64 					   NULL, &retval) == 0) &&
65 	       retval) {
66 	if ((size_t) namesize < (strlen(retval)+1))
67 	    return KRB5_CONFIG_NOTENUFSPACE;
68 	strncpy(name, retval, namesize);
69 	profile_release_string(retval);
70     } else {
71 #if defined(_WIN32)
72 	{
73 	    char    defname[160];
74 	    int     len;
75 
76 	    len= GetWindowsDirectory( defname, sizeof(defname)-2 );
77 	    defname[len]= '\0';
78 	    if ( (len + strlen(krb5_defkeyname) + 1) > namesize )
79 		return KRB5_CONFIG_NOTENUFSPACE;
80 	    sprintf(name, krb5_defkeyname, defname);
81 	}
82 #else
83 	if ((size_t) namesize < (strlen(krb5_defkeyname)+1))
84 	    return KRB5_CONFIG_NOTENUFSPACE;
85 	strncpy(name, krb5_defkeyname, namesize);
86 #endif
87     }
88     return 0;
89 }
90