1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1999-2001, 2008 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/*
29 * Support functionality for the POSIX.1e ACL interface
30 * These calls are intended only to be called within the library.
31 */
32
33#include <sys/types.h>
34#include "namespace.h"
35#include <sys/acl.h>
36#include "un-namespace.h"
37#include <errno.h>
38#include <grp.h>
39#include <pwd.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <assert.h>
44
45#include "acl_support.h"
46
47/*
48 * Given a uid/gid, return a username/groupname for the text form of an ACL.
49 * Note that we truncate user and group names, rather than error out, as
50 * this is consistent with other tools manipulating user and group names.
51 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID
52 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
53 * MAY HAVE SIDE-EFFECTS
54 */
55int
56_posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf,
57    int flags)
58{
59	struct group	*g;
60	struct passwd	*p;
61	int	i;
62
63	switch(tag) {
64	case ACL_USER:
65		if (flags & ACL_TEXT_NUMERIC_IDS)
66			p = NULL;
67		else
68			p = getpwuid(id);
69		if (!p)
70			i = snprintf(buf, buf_len, "%d", id);
71		else
72			i = snprintf(buf, buf_len, "%s", p->pw_name);
73
74		if (i < 0) {
75			errno = ENOMEM;
76			return (-1);
77		}
78		return (0);
79
80	case ACL_GROUP:
81		if (flags & ACL_TEXT_NUMERIC_IDS)
82			g = NULL;
83		else
84			g = getgrgid(id);
85		if (g == NULL)
86			i = snprintf(buf, buf_len, "%d", id);
87		else
88			i = snprintf(buf, buf_len, "%s", g->gr_name);
89
90		if (i < 0) {
91			errno = ENOMEM;
92			return (-1);
93		}
94		return (0);
95
96	default:
97		return (EINVAL);
98	}
99}
100