1/*
2 * Copyright (c) 1997 - 1999, 2002 - 2003 Kungliga Tekniska Högskolan
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
36KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
37krb5_aname_to_localname (krb5_context context,
38			 krb5_const_principal aname,
39			 size_t lnsize,
40			 char *lname)
41{
42    krb5_error_code ret;
43    krb5_realm *lrealms, *r;
44    int valid;
45    size_t len;
46    const char *res;
47
48    ret = krb5_get_default_realms (context, &lrealms);
49    if (ret)
50	return ret;
51
52    valid = 0;
53    for (r = lrealms; *r != NULL; ++r) {
54	if (strcmp (*r, aname->realm) == 0) {
55	    valid = 1;
56	    break;
57	}
58    }
59    krb5_free_host_realm (context, lrealms);
60    if (valid == 0)
61	return KRB5_NO_LOCALNAME;
62
63    if (aname->name.name_string.len == 1)
64	res = aname->name.name_string.val[0];
65    else if (aname->name.name_string.len == 2
66	     && strcmp (aname->name.name_string.val[1], "root") == 0) {
67	krb5_principal rootprinc;
68	krb5_boolean userok;
69
70	res = "root";
71
72	ret = krb5_copy_principal(context, aname, &rootprinc);
73	if (ret)
74	    return ret;
75
76	userok = krb5_kuserok(context, rootprinc, res);
77	krb5_free_principal(context, rootprinc);
78	if (!userok)
79	    return KRB5_NO_LOCALNAME;
80
81    } else
82	return KRB5_NO_LOCALNAME;
83
84    len = strlen (res);
85    if (len >= lnsize)
86	return ERANGE;
87    strlcpy (lname, res, lnsize);
88
89    return 0;
90}
91