blob: 83c573defcf87b696a8df442c987d8d8f496ef00 [file] [log] [blame]
Damien Miller57c30112006-03-26 14:24:48 +11001/* $OpenBSD: groupaccess.c,v 1.8 2006/03/25 13:17:01 djm Exp $ */
Kevin Steves886b06c2001-01-14 00:35:19 +00002/*
3 * Copyright (c) 2001 Kevin Steves. 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 ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
27
28#include "groupaccess.h"
Kevin Steves886b06c2001-01-14 00:35:19 +000029#include "xmalloc.h"
30#include "match.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000031#include "log.h"
Kevin Steves886b06c2001-01-14 00:35:19 +000032
33static int ngroups;
Damien Millera811d9a2004-02-24 13:05:11 +110034static char **groups_byname;
Kevin Steves886b06c2001-01-14 00:35:19 +000035
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000036/*
37 * Initialize group access list for user with primary (base) and
38 * supplementary groups. Return the number of groups in the list.
39 */
Kevin Steves886b06c2001-01-14 00:35:19 +000040int
41ga_init(const char *user, gid_t base)
42{
Damien Millera811d9a2004-02-24 13:05:11 +110043 gid_t *groups_bygid;
Kevin Steves886b06c2001-01-14 00:35:19 +000044 int i, j;
45 struct group *gr;
46
47 if (ngroups > 0)
48 ga_free();
49
Damien Millera811d9a2004-02-24 13:05:11 +110050 ngroups = NGROUPS_MAX;
51#if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
52 ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
53#endif
54
55 groups_bygid = xmalloc(ngroups * sizeof(*groups_bygid));
56 groups_byname = xmalloc(ngroups * sizeof(*groups_byname));
57
Kevin Steves886b06c2001-01-14 00:35:19 +000058 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
Damien Miller996acd22003-04-09 20:59:48 +100059 logit("getgrouplist: groups list too small");
Kevin Steves886b06c2001-01-14 00:35:19 +000060 for (i = 0, j = 0; i < ngroups; i++)
61 if ((gr = getgrgid(groups_bygid[i])) != NULL)
62 groups_byname[j++] = xstrdup(gr->gr_name);
Damien Millera811d9a2004-02-24 13:05:11 +110063 xfree(groups_bygid);
Kevin Steves886b06c2001-01-14 00:35:19 +000064 return (ngroups = j);
65}
66
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000067/*
68 * Return 1 if one of user's groups is contained in groups.
69 * Return 0 otherwise. Use match_pattern() for string comparison.
70 */
Kevin Steves886b06c2001-01-14 00:35:19 +000071int
72ga_match(char * const *groups, int n)
73{
74 int i, j;
75
76 for (i = 0; i < ngroups; i++)
77 for (j = 0; j < n; j++)
78 if (match_pattern(groups_byname[i], groups[j]))
79 return 1;
80 return 0;
81}
82
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000083/*
84 * Free memory allocated for group access list.
85 */
Kevin Steves886b06c2001-01-14 00:35:19 +000086void
87ga_free(void)
88{
89 int i;
90
91 if (ngroups > 0) {
92 for (i = 0; i < ngroups; i++)
93 xfree(groups_byname[i]);
94 ngroups = 0;
Damien Millera811d9a2004-02-24 13:05:11 +110095 xfree(groups_byname);
Kevin Steves886b06c2001-01-14 00:35:19 +000096 }
97}