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Ben Lindstrom4cc240d2001-07-04 04:46:56 +00001/* $OpenBSD: groupaccess.c,v 1.4 2001/06/26 17:27:23 markus Exp $ */
Ben Lindstrom36579d32001-01-29 07:39:26 +00002
Kevin Steves886b06c2001-01-14 00:35:19 +00003/*
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"
Kevin Steves886b06c2001-01-14 00:35:19 +000030#include "xmalloc.h"
31#include "match.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000032#include "log.h"
Kevin Steves886b06c2001-01-14 00:35:19 +000033
34static int ngroups;
35static char *groups_byname[NGROUPS_MAX + 1]; /* +1 for base/primary group */
36
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000037/*
38 * Initialize group access list for user with primary (base) and
39 * supplementary groups. Return the number of groups in the list.
40 */
Kevin Steves886b06c2001-01-14 00:35:19 +000041int
42ga_init(const char *user, gid_t base)
43{
44 gid_t groups_bygid[NGROUPS_MAX + 1];
45 int i, j;
46 struct group *gr;
47
48 if (ngroups > 0)
49 ga_free();
50
51 ngroups = sizeof(groups_bygid) / sizeof(gid_t);
52 if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
53 log("getgrouplist: groups list too small");
54 for (i = 0, j = 0; i < ngroups; i++)
55 if ((gr = getgrgid(groups_bygid[i])) != NULL)
56 groups_byname[j++] = xstrdup(gr->gr_name);
57 return (ngroups = j);
58}
59
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000060/*
61 * Return 1 if one of user's groups is contained in groups.
62 * Return 0 otherwise. Use match_pattern() for string comparison.
63 */
Kevin Steves886b06c2001-01-14 00:35:19 +000064int
65ga_match(char * const *groups, int n)
66{
67 int i, j;
68
69 for (i = 0; i < ngroups; i++)
70 for (j = 0; j < n; j++)
71 if (match_pattern(groups_byname[i], groups[j]))
72 return 1;
73 return 0;
74}
75
Ben Lindstrom4cc240d2001-07-04 04:46:56 +000076/*
77 * Free memory allocated for group access list.
78 */
Kevin Steves886b06c2001-01-14 00:35:19 +000079void
80ga_free(void)
81{
82 int i;
83
84 if (ngroups > 0) {
85 for (i = 0; i < ngroups; i++)
86 xfree(groups_byname[i]);
87 ngroups = 0;
88 }
89}