1 /*-
2 * Copyright (c) 1999-2001, 2008 Robert N. M. Watson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26 /*
27 * Support functionality for the POSIX.1e ACL interface
28 * These calls are intended only to be called within the library.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/types.h>
35 #include "namespace.h"
36 #include <sys/acl.h>
37 #include "un-namespace.h"
38 #include <errno.h>
39 #include <grp.h>
40 #include <pwd.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <assert.h>
45
46 #include "acl_support.h"
47
48 /*
49 * Given a uid/gid, return a username/groupname for the text form of an ACL.
50 * Note that we truncate user and group names, rather than error out, as
51 * this is consistent with other tools manipulating user and group names.
52 * XXX NOT THREAD SAFE, RELIES ON GETPWUID, GETGRGID
53 * XXX USES *PW* AND *GR* WHICH ARE STATEFUL AND THEREFORE THIS ROUTINE
54 * MAY HAVE SIDE-EFFECTS
55 */
56 int
_posix1e_acl_id_to_name(acl_tag_t tag,uid_t id,ssize_t buf_len,char * buf,int flags)57 _posix1e_acl_id_to_name(acl_tag_t tag, uid_t id, ssize_t buf_len, char *buf,
58 int flags)
59 {
60 struct group *g;
61 struct passwd *p;
62 int i;
63
64 switch(tag) {
65 case ACL_USER:
66 if (flags & ACL_TEXT_NUMERIC_IDS)
67 p = NULL;
68 else
69 p = getpwuid(id);
70 if (!p)
71 i = snprintf(buf, buf_len, "%d", id);
72 else
73 i = snprintf(buf, buf_len, "%s", p->pw_name);
74
75 if (i < 0) {
76 errno = ENOMEM;
77 return (-1);
78 }
79 return (0);
80
81 case ACL_GROUP:
82 if (flags & ACL_TEXT_NUMERIC_IDS)
83 g = NULL;
84 else
85 g = getgrgid(id);
86 if (g == NULL)
87 i = snprintf(buf, buf_len, "%d", id);
88 else
89 i = snprintf(buf, buf_len, "%s", g->gr_name);
90
91 if (i < 0) {
92 errno = ENOMEM;
93 return (-1);
94 }
95 return (0);
96
97 default:
98 return (EINVAL);
99 }
100 }
101