xref: /titanic_50/usr/src/cmd/ssh/sshd/groupaccess.c (revision 2eeaed14a5e2ed9bd811643ad5bffc3510ca0310)
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"
26 RCSID("$OpenBSD: groupaccess.c,v 1.5 2002/03/04 17:27:39 stevesk Exp $");
27 
28 #pragma ident	"%Z%%M%	%I%	%E% SMI"
29 
30 #include "groupaccess.h"
31 #include "xmalloc.h"
32 #include "match.h"
33 #include "log.h"
34 
35 static int ngroups;
36 static char *groups_byname[NGROUPS_UMAX + 1];	/* +1 for base/primary group */
37 
38 /*
39  * Initialize group access list for user with primary (base) and
40  * supplementary groups.  Return the number of groups in the list.
41  */
42 int
43 ga_init(const char *user, gid_t base)
44 {
45 	gid_t groups_bygid[NGROUPS_UMAX + 1];
46 	int i, j;
47 	struct group *gr;
48 
49 	if (ngroups > 0)
50 		ga_free();
51 
52 	ngroups = sizeof(groups_bygid) / sizeof(gid_t);
53 	if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
54 		log("getgrouplist: groups list too small");
55 	for (i = 0, j = 0; i < ngroups; i++)
56 		if ((gr = getgrgid(groups_bygid[i])) != NULL)
57 			groups_byname[j++] = xstrdup(gr->gr_name);
58 	return (ngroups = j);
59 }
60 
61 /*
62  * Return 1 if one of user's groups is contained in groups.
63  * Return 0 otherwise.  Use match_pattern() for string comparison.
64  */
65 int
66 ga_match(char * const *groups, int n)
67 {
68 	int i, j;
69 
70 	for (i = 0; i < ngroups; i++)
71 		for (j = 0; j < n; j++)
72 			if (match_pattern(groups_byname[i], groups[j]))
73 				return 1;
74 	return 0;
75 }
76 
77 /*
78  * Free memory allocated for group access list.
79  */
80 void
81 ga_free(void)
82 {
83 	int i;
84 
85 	if (ngroups > 0) {
86 		for (i = 0; i < ngroups; i++)
87 			xfree(groups_byname[i]);
88 		ngroups = 0;
89 	}
90 }
91