groupaccess.c revision 124208 
1/*
2 * Copyright (c) 2001 Kevin Steves.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
26RCSID("$OpenBSD: groupaccess.c,v 1.6 2003/04/08 20:21:28 itojun Exp $");
27
28#include "groupaccess.h"
29#include "xmalloc.h"
30#include "match.h"
31#include "log.h"
32
33static int ngroups;
34static char *groups_byname[NGROUPS_MAX + 1];	/* +1 for base/primary group */
35
36/*
37 * Initialize group access list for user with primary (base) and
38 * supplementary groups.  Return the number of groups in the list.
39 */
40int
41ga_init(const char *user, gid_t base)
42{
43	gid_t groups_bygid[NGROUPS_MAX + 1];
44	int i, j;
45	struct group *gr;
46
47	if (ngroups > 0)
48		ga_free();
49
50	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
51	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
52		logit("getgrouplist: groups list too small");
53	for (i = 0, j = 0; i < ngroups; i++)
54		if ((gr = getgrgid(groups_bygid[i])) != NULL)
55			groups_byname[j++] = xstrdup(gr->gr_name);
56	return (ngroups = j);
57}
58
59/*
60 * Return 1 if one of user's groups is contained in groups.
61 * Return 0 otherwise.  Use match_pattern() for string comparison.
62 */
63int
64ga_match(char * const *groups, int n)
65{
66	int i, j;
67
68	for (i = 0; i < ngroups; i++)
69		for (j = 0; j < n; j++)
70			if (match_pattern(groups_byname[i], groups[j]))
71				return 1;
72	return 0;
73}
74
75/*
76 * Free memory allocated for group access list.
77 */
78void
79ga_free(void)
80{
81	int i;
82
83	if (ngroups > 0) {
84		for (i = 0; i < ngroups; i++)
85			xfree(groups_byname[i]);
86		ngroups = 0;
87	}
88}
89