1 /* $OpenBSD: groupaccess.c,v 1.17 2019/03/06 22:14:23 dtucker Exp $ */
3 * Copyright (c) 2001 Kevin Steves. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include <sys/types.h>
38 #include "groupaccess.h"
43 static char **groups_byname;
46 * Initialize group access list for user with primary (base) and
47 * supplementary groups. Return the number of groups in the list.
50 ga_init(const char *user, gid_t base)
59 ngroups = NGROUPS_MAX;
60 #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
61 ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
64 groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid));
65 while (getgrouplist(user, base, groups_bygid, &ngroups) == -1) {
67 fatal("getgrouplist: groups list too small");
68 groups_bygid = xreallocarray(groups_bygid, ngroups,
69 sizeof(*groups_bygid));
71 groups_byname = xcalloc(ngroups, sizeof(*groups_byname));
73 for (i = 0, j = 0; i < ngroups; i++)
74 if ((gr = getgrgid(groups_bygid[i])) != NULL)
75 groups_byname[j++] = xstrdup(gr->gr_name);
81 * Return 1 if one of user's groups is contained in groups.
82 * Return 0 otherwise. Use match_pattern() for string comparison.
85 ga_match(char * const *groups, int n)
89 for (i = 0; i < ngroups; i++)
90 for (j = 0; j < n; j++)
91 if (match_pattern(groups_byname[i], groups[j]))
97 * Return 1 if one of user's groups matches group_pattern list.
98 * Return 0 on negated or no match.
101 ga_match_pattern_list(const char *group_pattern)
105 for (i = 0; i < ngroups; i++) {
106 switch (match_usergroup_pattern_list(groups_byname[i],
109 return 0; /* Negated match wins */
120 * Free memory allocated for group access list.
128 for (i = 0; i < ngroups; i++)
129 free(groups_byname[i]);
132 groups_byname = NULL;