1 /*
2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 
7 /*
8  * lib/krb5/os/ktdefname.c
9  *
10  * Copyright 1990 by the Massachusetts Institute of Technology.
11  * All Rights Reserved.
12  *
13  * Export of this software from the United States of America may
14  *   require a specific license from the United States Government.
15  *   It is the responsibility of any person or organization contemplating
16  *   export to obtain such a license before exporting.
17  *
18  * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
19  * distribute this software and its documentation for any purpose and
20  * without fee is hereby granted, provided that the above copyright
21  * notice appear in all copies and that both that copyright notice and
22  * this permission notice appear in supporting documentation, and that
23  * the name of M.I.T. not be used in advertising or publicity pertaining
24  * to distribution of the software without specific, written prior
25  * permission.  Furthermore if you modify this software you must label
26  * your software as modified software and not distribute it in such a
27  * fashion that it might be confused with the original M.I.T. software.
28  * M.I.T. makes no representations about the suitability of
29  * this software for any purpose.  It is provided "as is" without express
30  * or implied warranty.
31  *
32  *
33  * Return default keytab file name.
34  */
35 
36 #define NEED_WINDOWS
37 
38 #include "k5-int.h"
39 
40 extern char *krb5_defkeyname;
41 
42 /* this is a an exceedinly gross thing. */
43 char *krb5_overridekeyname = NULL;
44 
45 krb5_error_code KRB5_CALLCONV
46 krb5_kt_default_name(krb5_context context, char *name, int namesize)
47 {
48     char *cp = 0;
49     char *retval;
50 
51     if (krb5_overridekeyname) {
52 	if ((size_t) namesize < (strlen(krb5_overridekeyname)+1))
53 	    return KRB5_CONFIG_NOTENUFSPACE;
54 	/* Solaris Kerberos */
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 	/* Solaris Kerberos */
61 	strncpy(name, cp, namesize);
62     } else if ((profile_get_string(context->profile,
63 				   "libdefaults",
64 				   "default_keytab_name", NULL,
65 				   NULL, &retval) == 0) &&
66 	       retval) {
67 	if ((size_t) namesize < (strlen(retval)+1))
68 	    return KRB5_CONFIG_NOTENUFSPACE;
69 	/* Solaris Kerberos */
70 	strncpy(name, retval, namesize);
71 	profile_release_string(retval);
72     } else {
73 #if defined(_WIN32)
74 	{
75 	    char    defname[160];
76 	    int     len;
77 
78 	    len= GetWindowsDirectory( defname, sizeof(defname)-2 );
79 	    defname[len]= '\0';
80 	    if ( (len + strlen(krb5_defkeyname) + 1) > namesize )
81 		return KRB5_CONFIG_NOTENUFSPACE;
82 	    sprintf(name, krb5_defkeyname, defname);
83 	}
84 #else
85 	if ((size_t) namesize < (strlen(krb5_defkeyname)+1))
86 	    return KRB5_CONFIG_NOTENUFSPACE;
87 	/* Solaris Kerberos */
88 	strncpy(name, krb5_defkeyname, namesize);
89 #endif
90     }
91     return 0;
92 }
93 
94