]>
Commit | Line | Data |
---|---|---|
31652869 | 1 | /* $OpenBSD: groupaccess.c,v 1.12 2006/08/03 03:34:42 deraadt 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> |
536c14e8 | 29 | #include <sys/param.h> |
16fbe330 | 30 | |
31 | #include <grp.h> | |
5188ba17 | 32 | #include <unistd.h> |
31652869 | 33 | #include <stdarg.h> |
16fbe330 | 34 | |
63b68889 | 35 | #include "xmalloc.h" |
31652869 | 36 | #include "groupaccess.h" |
63b68889 | 37 | #include "match.h" |
42f11eb2 | 38 | #include "log.h" |
63b68889 | 39 | |
40 | static int ngroups; | |
13dff404 | 41 | static char **groups_byname; |
63b68889 | 42 | |
255cabd9 | 43 | /* |
44 | * Initialize group access list for user with primary (base) and | |
45 | * supplementary groups. Return the number of groups in the list. | |
46 | */ | |
63b68889 | 47 | int |
48 | ga_init(const char *user, gid_t base) | |
49 | { | |
13dff404 | 50 | gid_t *groups_bygid; |
63b68889 | 51 | int i, j; |
52 | struct group *gr; | |
53 | ||
54 | if (ngroups > 0) | |
55 | ga_free(); | |
56 | ||
13dff404 | 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 | ||
01d35895 | 62 | groups_bygid = xcalloc(ngroups, sizeof(*groups_bygid)); |
63 | groups_byname = xcalloc(ngroups, sizeof(*groups_byname)); | |
13dff404 | 64 | |
63b68889 | 65 | if (getgrouplist(user, base, groups_bygid, &ngroups) == -1) |
bbe88b6d | 66 | logit("getgrouplist: groups list too small"); |
63b68889 | 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); | |
13dff404 | 70 | xfree(groups_bygid); |
63b68889 | 71 | return (ngroups = j); |
72 | } | |
73 | ||
255cabd9 | 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 | */ | |
63b68889 | 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 | ||
255cabd9 | 90 | /* |
91 | * Free memory allocated for group access list. | |
92 | */ | |
63b68889 | 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; | |
13dff404 | 102 | xfree(groups_byname); |
63b68889 | 103 | } |
104 | } |