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2e437378 | 1 | /* $OpenBSD: groupaccess.c,v 1.12 2006/08/03 03:34:42 deraadt Exp $ */ |
3c0ef626 | 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 | ||
2e437378 | 28 | #include <sys/types.h> |
29 | #include <sys/param.h> | |
30 | ||
31 | #include <grp.h> | |
32 | #include <unistd.h> | |
33 | #include <stdarg.h> | |
34 | ||
3c0ef626 | 35 | #include "xmalloc.h" |
2e437378 | 36 | #include "groupaccess.h" |
3c0ef626 | 37 | #include "match.h" |
38 | #include "log.h" | |
39 | ||
40 | static int ngroups; | |
416fd2a8 | 41 | static char **groups_byname; |
3c0ef626 | 42 | |
43 | /* | |
44 | * Initialize group access list for user with primary (base) and | |
45 | * supplementary groups. Return the number of groups in the list. | |
46 | */ | |
47 | int | |
48 | ga_init(const char *user, gid_t base) | |
49 | { | |
416fd2a8 | 50 | gid_t *groups_bygid; |
3c0ef626 | 51 | int i, j; |
52 | struct group *gr; | |
53 | ||
54 | if (ngroups > 0) | |
55 | ga_free(); | |
56 | ||
416fd2a8 | 57 | ngroups = NGROUPS_MAX; |
58 | #if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX) | |
59 | ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX)); | |
60 | #endif | |
61 | ||
2e437378 | 62 | groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); |
63 | groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); | |
416fd2a8 | 64 | |
3c0ef626 | 65 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
70791e56 | 66 | logit("getgrouplist: groups list too small"); |
3c0ef626 | 67 | for (i = 0, j = 0; i < ngroups; i++) |
68 | if ((gr = getgrgid(groups_bygid[i])) != NULL) | |
69 | groups_byname[j++] = xstrdup(gr->gr_name); | |
416fd2a8 | 70 | xfree(groups_bygid); |
3c0ef626 | 71 | return (ngroups = j); |
72 | } | |
73 | ||
74 | /* | |
75 | * Return 1 if one of user's groups is contained in groups. | |
76 | * Return 0 otherwise. Use match_pattern() for string comparison. | |
77 | */ | |
78 | int | |
79 | ga_match(char * const *groups, int n) | |
80 | { | |
81 | int i, j; | |
82 | ||
83 | for (i = 0; i < ngroups; i++) | |
84 | for (j = 0; j < n; j++) | |
85 | if (match_pattern(groups_byname[i], groups[j])) | |
86 | return 1; | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /* | |
91 | * Free memory allocated for group access list. | |
92 | */ | |
93 | void | |
94 | ga_free(void) | |
95 | { | |
96 | int i; | |
97 | ||
98 | if (ngroups > 0) { | |
99 | for (i = 0; i < ngroups; i++) | |
100 | xfree(groups_byname[i]); | |
101 | ngroups = 0; | |
416fd2a8 | 102 | xfree(groups_byname); |
3c0ef626 | 103 | } |
104 | } |