1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/* $OpenBSD: groupaccess.c,v 1.13 2008/07/04 03:44:59 djm Exp $ */
/*
* Copyright (c) 2001 Kevin Steves. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/param.h>
#include <grp.h>
#ifdef HAVE_LIMITS_H
# include <limits.h>
#endif
#include <unistd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include "groupaccess.h"
#include "match.h"
static int ngroups;
static char **groups_byname;
/*
* Initialize group access list for user with primary (base) and
* supplementary groups. Return the number of groups in the list.
*/
int
ga_init(const char *user, gid_t base)
{
gid_t *groups_bygid;
int i, j;
struct group *gr;
if (ngroups > 0)
ga_free();
#ifdef __APPLE__
ngroups = 1024;
#else
ngroups = NGROUPS_MAX;
# if defined(HAVE_SYSCONF) && defined(_SC_NGROUPS_MAX)
# ifndef MAX
# define MAX(a,b) (((a)>(b))?(a):(b))
# endif
ngroups = MAX(NGROUPS_MAX, sysconf(_SC_NGROUPS_MAX));
# endif
#endif
if (!(groups_bygid = calloc(ngroups, sizeof(*groups_bygid))) ||
!((groups_byname = calloc(ngroups, sizeof(*groups_byname))))) {
free(groups_bygid);
free(groups_byname);
return (-1);
}
if (getgrouplist(user, base, groups_bygid, &ngroups) == -1)
return (-1);
for (i = 0, j = 0; i < ngroups; i++)
if ((gr = getgrgid(groups_bygid[i])) != NULL)
groups_byname[j++] = strdup(gr->gr_name);
free(groups_bygid);
return (ngroups = j);
}
/*
* Return 1 if one of user's groups is contained in groups.
* Return 0 otherwise. Use match_pattern() for string comparison.
*/
int
ga_match(char * const *groups, int n)
{
int i, j;
for (i = 0; i < ngroups; i++)
for (j = 0; j < n; j++)
if (match_pattern(groups_byname[i], groups[j]))
return 1;
return 0;
}
/*
* Return 1 if one of user's groups matches group_pattern list.
* Return 0 on negated or no match.
*/
int
ga_match_pattern_list(const char *group_pattern)
{
int i, found = 0;
size_t len = strlen(group_pattern);
for (i = 0; i < ngroups; i++) {
switch (match_pattern_list(groups_byname[i],
group_pattern, len, 0)) {
case -1:
return 0; /* Negated match wins */
case 0:
continue;
case 1:
found = 1;
}
}
return found;
}
/*
* Free memory allocated for group access list.
*/
void
ga_free(void)
{
int i;
if (ngroups > 0) {
for (i = 0; i < ngroups; i++)
free(groups_byname[i]);
ngroups = 0;
free(groups_byname);
}
}
|
