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5188ba17 | 1 | /* $OpenBSD: groupaccess.c,v 1.10 2006/07/17 01:31:09 stevesk Exp $ */ |
63b68889 | 2 | /* |
3 | * Copyright (c) 2001 Kevin Steves. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. | |
13 | * | |
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. | |
24 | */ | |
25 | ||
26 | #include "includes.h" | |
27 | ||
16fbe330 | 28 | #include <sys/types.h> |
29 | ||
30 | #include <grp.h> | |
5188ba17 | 31 | #include <unistd.h> |
16fbe330 | 32 | |
63b68889 | 33 | #include "groupaccess.h" |
63b68889 | 34 | #include "xmalloc.h" |
35 | #include "match.h" | |
42f11eb2 | 36 | #include "log.h" |
63b68889 | 37 | |
38 | static int ngroups; | |
13dff404 | 39 | static char **groups_byname; |
63b68889 | 40 | |
255cabd9 | 41 | /* |
42 | * Initialize group access list for user with primary (base) and | |
43 | * supplementary groups. Return the number of groups in the list. | |
44 | */ | |
63b68889 | 45 | int |
46 | ga_init(const char *user, gid_t base) | |
47 | { | |
13dff404 | 48 | gid_t *groups_bygid; |
63b68889 | 49 | int i, j; |
50 | struct group *gr; | |
51 | ||
52 | if (ngroups > 0) | |
53 | ga_free(); | |
54 | ||
13dff404 | 55 | ngroups = NGROUPS_MAX; |
56 | #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) | |
57 | ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); | |
58 | #endif | |
59 | ||
01d35895 | 60 | groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); |
61 | groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); | |
13dff404 | 62 | |
63b68889 | 63 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
bbe88b6d | 64 | logit("getgrouplist: groups list too small"); |
63b68889 | 65 | for (i = 0, j = 0; i < ngroups; i++) |
66 | if ((gr = getgrgid(groups_bygid[i])) != NULL) | |
67 | groups_byname[j++] = xstrdup(gr->gr_name); | |
13dff404 | 68 | xfree(groups_bygid); |
63b68889 | 69 | return (ngroups = j); |
70 | } | |
71 | ||
255cabd9 | 72 | /* |
73 | * Return 1 if one of user's groups is contained in groups. | |
74 | * Return 0 otherwise. Use match_pattern() for string comparison. | |
75 | */ | |
63b68889 | 76 | int |
77 | ga_match(char * const *groups, int n) | |
78 | { | |
79 | int i, j; | |
80 | ||
81 | for (i = 0; i < ngroups; i++) | |
82 | for (j = 0; j < n; j++) | |
83 | if (match_pattern(groups_byname[i], groups[j])) | |
84 | return 1; | |
85 | return 0; | |
86 | } | |
87 | ||
255cabd9 | 88 | /* |
89 | * Free memory allocated for group access list. | |
90 | */ | |
63b68889 | 91 | void |
92 | ga_free(void) | |
93 | { | |
94 | int i; | |
95 | ||
96 | if (ngroups > 0) { | |
97 | for (i = 0; i < ngroups; i++) | |
98 | xfree(groups_byname[i]); | |
99 | ngroups = 0; | |
13dff404 | 100 | xfree(groups_byname); |
63b68889 | 101 | } |
102 | } |