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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Copyright (c) 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef TIME_WITH_SYS_TIME
# include <time.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include "sudoers.h"
#include "sudo_dso.h"
#if defined(HAVE_DLOPEN) || defined(HAVE_SHL_LOAD)
static void *group_handle;
static struct sudoers_group_plugin *group_plugin;
/*
* Load the specified plugin and run its init function.
* Returns -1 if unable to open the plugin, else it returns
* the value from the plugin's init function.
*/
int
group_plugin_load(char *plugin_info)
{
struct stat sb;
char *args, path[PATH_MAX];
char **argv = NULL;
int len, rc = -1;
debug_decl(group_plugin_load, SUDO_DEBUG_UTIL)
/*
* Fill in .so path and split out args (if any).
*/
if ((args = strpbrk(plugin_info, " \t")) != NULL) {
len = snprintf(path, sizeof(path), "%s%.*s",
(*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "",
(int)(args - plugin_info), plugin_info);
args++;
} else {
len = snprintf(path, sizeof(path), "%s%s",
(*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "", plugin_info);
}
if (len <= 0 || (size_t)len >= sizeof(path)) {
errno = ENAMETOOLONG;
warning("%s%s",
(*plugin_info != '/') ? _PATH_SUDO_PLUGIN_DIR : "", plugin_info);
goto done;
}
/* Sanity check plugin path. */
if (stat(path, &sb) != 0) {
warning("%s", path);
goto done;
}
if (sb.st_uid != ROOT_UID) {
warningx(U_("%s must be owned by uid %d"), path, ROOT_UID);
goto done;
}
if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
warningx(U_("%s must only be writable by owner"), path);
goto done;
}
/* Open plugin and map in symbol. */
group_handle = sudo_dso_load(path, SUDO_DSO_LAZY|SUDO_DSO_GLOBAL);
if (!group_handle) {
warningx(U_("unable to load %s: %s"), path, sudo_dso_strerror());
goto done;
}
group_plugin = sudo_dso_findsym(group_handle, "group_plugin");
if (group_plugin == NULL) {
warningx(U_("unable to find symbol \"group_plugin\" in %s"), path);
goto done;
}
if (GROUP_API_VERSION_GET_MAJOR(group_plugin->version) != GROUP_API_VERSION_MAJOR) {
warningx(U_("%s: incompatible group plugin major version %d, expected %d"),
path, GROUP_API_VERSION_GET_MAJOR(group_plugin->version),
GROUP_API_VERSION_MAJOR);
goto done;
}
/*
* Split args into a vector if specified.
*/
if (args != NULL) {
int ac = 0;
bool wasblank = true;
char *cp;
for (cp = args; *cp != '\0'; cp++) {
if (isblank((unsigned char)*cp)) {
wasblank = true;
} else if (wasblank) {
wasblank = false;
ac++;
}
}
if (ac != 0) {
argv = emalloc2(ac, sizeof(char *));
ac = 0;
for ((cp = strtok(args, " \t")); cp; (cp = strtok(NULL, " \t")))
argv[ac++] = cp;
}
}
rc = (group_plugin->init)(GROUP_API_VERSION, sudo_printf, argv);
done:
efree(argv);
if (rc != true) {
if (group_handle != NULL) {
sudo_dso_unload(group_handle);
group_handle = NULL;
group_plugin = NULL;
}
}
debug_return_bool(rc);
}
void
group_plugin_unload(void)
{
debug_decl(group_plugin_unload, SUDO_DEBUG_UTIL)
if (group_plugin != NULL) {
(group_plugin->cleanup)();
group_plugin = NULL;
}
if (group_handle != NULL) {
sudo_dso_unload(group_handle);
group_handle = NULL;
}
debug_return;
}
int
group_plugin_query(const char *user, const char *group,
const struct passwd *pwd)
{
debug_decl(group_plugin_query, SUDO_DEBUG_UTIL)
if (group_plugin == NULL)
debug_return_bool(false);
debug_return_bool((group_plugin->query)(user, group, pwd));
}
#else /* !HAVE_DLOPEN && !HAVE_SHL_LOAD */
/*
* No loadable shared object support.
*/
int
group_plugin_load(char *plugin_info)
{
debug_decl(group_plugin_load, SUDO_DEBUG_UTIL)
debug_return_bool(false);
}
void
group_plugin_unload(void)
{
debug_decl(group_plugin_unload, SUDO_DEBUG_UTIL)
debug_return;
}
int
group_plugin_query(const char *user, const char *group,
const struct passwd *pwd)
{
debug_decl(group_plugin_query, SUDO_DEBUG_UTIL)
debug_return_bool(false);
}
#endif /* HAVE_DLOPEN || HAVE_SHL_LOAD */
|
