xref: /freebsd/crypto/heimdal/lib/krb5/aname_to_localname.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1997 - 1999, 2002 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 <krb5_locl.h>
35 
36 RCSID("$Id: aname_to_localname.c,v 1.6 2003/04/16 16:01:06 lha Exp $");
37 
38 krb5_error_code
39 krb5_aname_to_localname (krb5_context context,
40 			 krb5_const_principal aname,
41 			 size_t lnsize,
42 			 char *lname)
43 {
44     krb5_error_code ret;
45     krb5_realm *lrealms, *r;
46     int valid;
47     size_t len;
48     const char *res;
49 
50     ret = krb5_get_default_realms (context, &lrealms);
51     if (ret)
52 	return ret;
53 
54     valid = 0;
55     for (r = lrealms; *r != NULL; ++r) {
56 	if (strcmp (*r, aname->realm) == 0) {
57 	    valid = 1;
58 	    break;
59 	}
60     }
61     krb5_free_host_realm (context, lrealms);
62     if (valid == 0)
63 	return KRB5_NO_LOCALNAME;
64 
65     if (aname->name.name_string.len == 1)
66 	res = aname->name.name_string.val[0];
67     else if (aname->name.name_string.len == 2
68 	     && strcmp (aname->name.name_string.val[1], "root") == 0) {
69 	krb5_principal rootprinc;
70 	krb5_boolean userok;
71 
72 	res = "root";
73 
74 	ret = krb5_copy_principal(context, aname, &rootprinc);
75 	if (ret)
76 	    return ret;
77 
78 	userok = krb5_kuserok(context, rootprinc, res);
79 	krb5_free_principal(context, rootprinc);
80 	if (!userok)
81 	    return KRB5_NO_LOCALNAME;
82 
83     } else
84 	return KRB5_NO_LOCALNAME;
85 
86     len = strlen (res);
87     if (len >= lnsize)
88 	return ERANGE;
89     strlcpy (lname, res, lnsize);
90 
91     return 0;
92 }
93