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
142
143
144
|
/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2010-2014 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#include <string.h>
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <grp.h>
#include "sudo_compat.h"
#include "sudo_dso.h"
#include "sudo_plugin.h"
#include "sudo_util.h"
/*
* Sudoers group plugin that does group name-based lookups using the system
* group database functions, similar to how sudo behaved prior to 1.7.3.
* This can be used on systems where lookups by group ID are problematic.
*/
typedef struct group * (*sysgroup_getgrnam_t)(const char *);
typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
typedef void (*sysgroup_gr_delref_t)(struct group *);
static sysgroup_getgrnam_t sysgroup_getgrnam;
static sysgroup_getgrgid_t sysgroup_getgrgid;
static sysgroup_gr_delref_t sysgroup_gr_delref;
static bool need_setent;
static int
sysgroup_init(int version, sudo_printf_t plugin_printf, char *const argv[])
{
void *handle;
if (SUDO_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
plugin_printf(SUDO_CONV_ERROR_MSG,
"sysgroup_group: incompatible major version %d, expected %d\n",
SUDO_API_VERSION_GET_MAJOR(version),
GROUP_API_VERSION_MAJOR);
return -1;
}
/* Share group cache with sudo if possible. */
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrnam");
if (handle != NULL) {
sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
} else {
sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
need_setent = true;
}
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_getgrgid");
if (handle != NULL) {
sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
} else {
sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
need_setent = true;
}
handle = sudo_dso_findsym(SUDO_DSO_DEFAULT, "sudo_gr_delref");
if (handle != NULL)
sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
if (need_setent)
setgrent();
return true;
}
static void
sysgroup_cleanup(void)
{
if (need_setent)
endgrent();
}
/*
* Returns true if "user" is a member of "group", else false.
*/
static int
sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
{
char **member;
struct group *grp;
grp = sysgroup_getgrnam(group);
if (grp == NULL && group[0] == '#' && group[1] != '\0') {
const char *errstr;
gid_t gid = sudo_strtoid(group + 1, &errstr);
if (errstr == NULL)
grp = sysgroup_getgrgid(gid);
}
if (grp != NULL) {
if (grp->gr_mem != NULL) {
for (member = grp->gr_mem; *member != NULL; member++) {
if (strcasecmp(user, *member) == 0) {
if (sysgroup_gr_delref)
sysgroup_gr_delref(grp);
return true;
}
}
}
if (sysgroup_gr_delref)
sysgroup_gr_delref(grp);
}
return false;
}
sudo_dso_public struct sudoers_group_plugin group_plugin = {
GROUP_API_VERSION,
sysgroup_init,
sysgroup_cleanup,
sysgroup_query
};
|
