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3c0ef626 | 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" | |
70791e56 | 26 | RCSID("$OpenBSD: groupaccess.c,v 1.6 2003/04/08 20:21:28 itojun Exp $"); |
3c0ef626 | 27 | |
28 | #include "groupaccess.h" | |
29 | #include "xmalloc.h" | |
30 | #include "match.h" | |
31 | #include "log.h" | |
32 | ||
33 | static int ngroups; | |
416fd2a8 | 34 | static char **groups_byname; |
3c0ef626 | 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 | */ | |
40 | int | |
41 | ga_init(const char *user, gid_t base) | |
42 | { | |
416fd2a8 | 43 | gid_t *groups_bygid; |
3c0ef626 | 44 | int i, j; |
45 | struct group *gr; | |
46 | ||
47 | if (ngroups > 0) | |
48 | ga_free(); | |
49 | ||
416fd2a8 | 50 | ngroups = NGROUPS_MAX; |
51 | #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) | |
52 | ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); | |
53 | #endif | |
54 | ||
55 | groups_bygid = xmalloc(ngroups * sizeof(*groups_bygid)); | |
56 | groups_byname = xmalloc(ngroups * sizeof(*groups_byname)); | |
57 | ||
3c0ef626 | 58 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
70791e56 | 59 | logit("getgrouplist: groups list too small"); |
3c0ef626 | 60 | for (i = 0, j = 0; i < ngroups; i++) |
61 | if ((gr = getgrgid(groups_bygid[i])) != NULL) | |
62 | groups_byname[j++] = xstrdup(gr->gr_name); | |
416fd2a8 | 63 | xfree(groups_bygid); |
3c0ef626 | 64 | return (ngroups = j); |
65 | } | |
66 | ||
67 | /* | |
68 | * Return 1 if one of user's groups is contained in groups. | |
69 | * Return 0 otherwise. Use match_pattern() for string comparison. | |
70 | */ | |
71 | int | |
72 | ga_match(char * const *groups, int n) | |
73 | { | |
74 | int i, j; | |
75 | ||
76 | for (i = 0; i < ngroups; i++) | |
77 | for (j = 0; j < n; j++) | |
78 | if (match_pattern(groups_byname[i], groups[j])) | |
79 | return 1; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | /* | |
84 | * Free memory allocated for group access list. | |
85 | */ | |
86 | void | |
87 | ga_free(void) | |
88 | { | |
89 | int i; | |
90 | ||
91 | if (ngroups > 0) { | |
92 | for (i = 0; i < ngroups; i++) | |
93 | xfree(groups_byname[i]); | |
94 | ngroups = 0; | |
416fd2a8 | 95 | xfree(groups_byname); |
3c0ef626 | 96 | } |
97 | } |