groupaccess.c revision 76259 
1/*	$OpenBSD: groupaccess.c,v 1.3 2001/01/29 01:58:15 niklas Exp $	*/
2
3/*
4 * Copyright (c) 2001 Kevin Steves.  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 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "includes.h"
28
29#include "groupaccess.h"
30#include "xmalloc.h"
31#include "match.h"
32#include "log.h"
33
34static int ngroups;
35static char *groups_byname[NGROUPS_MAX + 1];	/* +1 for base/primary group */
36
37int
38ga_init(const char *user, gid_t base)
39{
40	gid_t groups_bygid[NGROUPS_MAX + 1];
41	int i, j;
42	struct group *gr;
43
44	if (ngroups > 0)
45		ga_free();
46
47	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
48	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
49		log("getgrouplist: groups list too small");
50	for (i = 0, j = 0; i < ngroups; i++)
51		if ((gr = getgrgid(groups_bygid[i])) != NULL)
52			groups_byname[j++] = xstrdup(gr->gr_name);
53	return (ngroups = j);
54}
55
56int
57ga_match(char * const *groups, int n)
58{
59	int i, j;
60
61	for (i = 0; i < ngroups; i++)
62		for (j = 0; j < n; j++)
63			if (match_pattern(groups_byname[i], groups[j]))
64				return 1;
65	return 0;
66}
67
68void
69ga_free(void)
70{
71	int i;
72
73	if (ngroups > 0) {
74		for (i = 0; i < ngroups; i++)
75			xfree(groups_byname[i]);
76		ngroups = 0;
77	}
78}
79