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- Committer: teddy at recompile
- Date: 2020-04-05 21:30:59 UTC
- Revision ID: teddy@recompile.se-20200405213059-fb2a61ckqynrmatk
Fix file descriptor leak in mandos-client
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
58
60
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
63
#include <signal.h> /* struct sigaction, sigemptyset(),
61
64
sigaddset(), sigaction(),
62
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
65
75
66
76
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
85
84
86
85
typedef struct plugin{
87
86
char *name; /* can be NULL or any plugin name */
90
89
char **environ;
91
90
int envc;
92
91
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
93
102
struct plugin *next;
94
103
} plugin;
95
104
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
100
115
return p;
101
116
}
102
117
}
103
118
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
106
124
return NULL;
107
125
}
108
126
char *copy_name = NULL;
109
127
if(name != NULL){
110
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
111
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
112
135
return NULL;
113
136
}
114
137
}
115
138
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
121
143
122
new_plugin->argv = malloc(sizeof(char *) * 2);
123
if (new_plugin->argv == NULL){
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
124
149
free(copy_name);
125
150
free(new_plugin);
151
errno = e;
126
152
return NULL;
127
153
}
128
154
new_plugin->argv[0] = copy_name;
129
155
new_plugin->argv[1] = NULL;
130
131
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
132
160
if(new_plugin->environ == NULL){
161
int e = errno;
133
162
free(copy_name);
134
163
free(new_plugin->argv);
135
164
free(new_plugin);
165
errno = e;
136
166
return NULL;
137
167
}
138
168
new_plugin->environ[0] = NULL;
169
139
170
/* Append the new plugin to the list */
140
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
141
172
return new_plugin;
142
173
}
143
174
144
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
145
177
static bool add_to_char_array(const char *new, char ***array,
146
178
int *len){
147
179
/* Resize the pointed-to array to hold one more pointer */
148
*array = realloc(*array, sizeof(char *)
149
* (size_t) ((*len) + 2));
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
150
196
/* Malloc check */
151
if(*array == NULL){
197
if(new_array == NULL){
152
198
return false;
153
199
}
200
*array = new_array;
154
201
/* Make a copy of the new string */
155
char *copy = strdup(new);
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
156
206
if(copy == NULL){
157
207
return false;
158
208
}
165
215
}
166
216
167
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
168
219
static bool add_argument(plugin *p, const char *arg){
169
220
if(p == NULL){
170
221
return false;
173
224
}
174
225
175
226
/* Add to a plugin's environment */
176
static bool add_environment(plugin *p, const char *def){
227
__attribute__((nonnull(2), warn_unused_result))
228
static bool add_environment(plugin *p, const char *def, bool replace){
177
229
if(p == NULL){
178
230
return false;
179
231
}
232
/* namelen = length of name of environment variable */
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
237
/* It already exists */
238
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
244
return false;
245
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
248
}
249
return true;
250
}
251
}
180
252
return add_to_char_array(def, &(p->environ), &(p->envc));
181
253
}
182
254
183
255
#ifndef O_CLOEXEC
184
256
/*
185
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
186
258
* Descriptor Flags".
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
260
*/
189
static int set_cloexec_flag(int fd)
190
{
191
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
264
/* If reading the flags failed, return error indication now. */
193
265
if(ret < 0){
194
266
return ret;
195
267
}
196
268
/* Store modified flag word in the descriptor. */
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
198
271
}
199
200
process *process_list = NULL;
201
202
/* Mark a process as completed when it exits, and save its exit
272
#endif /* not O_CLOEXEC */
273
274
275
/* Mark processes as completed when they exit, and save their exit
203
276
status. */
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
279
while(true){
280
plugin *proc = plugin_list;
281
int status;
282
pid_t pid = waitpid(-1, &status, WNOHANG);
283
if(pid == 0){
284
/* Only still running child processes */
285
break;
286
}
287
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
291
}
292
error(0, errno, "waitpid");
293
}
294
295
/* A child exited, find it in process_list */
296
while(proc != NULL and proc->pid != pid){
297
proc = proc->next;
298
}
299
if(proc == NULL){
300
/* Process not found in process list */
301
continue;
302
}
303
proc->status = status;
304
proc->completed = 1;
305
}
306
errno = old_errno;
221
307
}
222
308
223
bool print_out_password(const char *buffer, size_t length){
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
224
312
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
228
313
for(size_t written = 0; written < length; written += (size_t)ret){
229
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
230
315
length - written));
235
320
return true;
236
321
}
237
322
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
static void free_plugin(plugin *plugin_node){
326
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
328
free(*arg);
329
}
330
free(plugin_node->name);
331
free(plugin_node->argv);
332
for(char **env = plugin_node->environ; *env != NULL; env++){
333
free(*env);
334
}
335
free(plugin_node->environ);
336
free(plugin_node->buffer);
337
338
/* Removes the plugin from the singly-linked list */
339
if(plugin_node == plugin_list){
340
/* First one - simple */
341
plugin_list = plugin_list->next;
342
} else {
343
/* Second one or later */
344
for(plugin *p = plugin_list; p != NULL; p = p->next){
345
if(p->next == plugin_node){
346
p->next = plugin_node->next;
347
break;
348
}
244
349
}
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
350
}
351
352
free(plugin_node);
257
353
}
258
354
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
355
static void free_plugin_list(void){
356
while(plugin_list != NULL){
357
free_plugin(plugin_list);
271
358
}
272
359
}
273
360
274
361
int main(int argc, char *argv[]){
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
char *argfile = NULL;
277
365
FILE *conffp;
278
size_t d_name_len;
279
DIR *dir = NULL;
280
struct dirent *dirst;
366
struct dirent **direntries = NULL;
281
367
struct stat st;
282
368
fd_set rfds_all;
283
369
int ret, maxfd = 0;
370
ssize_t sret;
284
371
uid_t uid = 65534;
285
372
gid_t gid = 65534;
286
373
bool debug = false;
290
377
.sa_flags = SA_NOCLDSTOP };
291
378
char **custom_argv = NULL;
292
379
int custom_argc = 0;
380
int dir_fd = -1;
293
381
294
382
/* Establish a signal handler */
295
383
sigemptyset(&sigchld_action.sa_mask);
296
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
297
385
if(ret == -1){
298
perror("sigaddset");
299
exitstatus = EXIT_FAILURE;
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
300
388
goto fallback;
301
389
}
302
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
303
391
if(ret == -1){
304
perror("sigaction");
305
exitstatus = EXIT_FAILURE;
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
306
394
goto fallback;
307
395
}
308
396
311
399
{ .name = "global-options", .key = 'g',
312
400
.arg = "OPTION[,OPTION[,...]]",
313
401
.doc = "Options passed to all plugins" },
314
{ .name = "global-envs", .key = 'e',
402
{ .name = "global-env", .key = 'G',
315
403
.arg = "VAR=value",
316
404
.doc = "Environment variable passed to all plugins" },
317
405
{ .name = "options-for", .key = 'o',
318
406
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
319
407
.doc = "Options passed only to specified plugin" },
320
{ .name = "envs-for", .key = 'f',
408
{ .name = "env-for", .key = 'E',
321
409
.arg = "PLUGIN:ENV=value",
322
410
.doc = "Environment variable passed to specified plugin" },
323
411
{ .name = "disable", .key = 'd',
324
412
.arg = "PLUGIN",
325
413
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
326
417
{ .name = "plugin-dir", .key = 128,
327
418
.arg = "DIRECTORY",
328
419
.doc = "Specify a different plugin directory", .group = 2 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
420
{ .name = "config-file", .key = 129,
421
.arg = "FILE",
422
.doc = "Specify a different configuration file", .group = 2 },
423
{ .name = "userid", .key = 130,
424
.arg = "ID", .flags = 0,
425
.doc = "User ID the plugins will run as", .group = 3 },
426
{ .name = "groupid", .key = 131,
427
.arg = "ID", .flags = 0,
428
.doc = "Group ID the plugins will run as", .group = 3 },
429
{ .name = "debug", .key = 132,
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
337
444
{ .name = NULL }
338
445
};
339
446
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
344
switch (key) {
345
case 'g':
346
if (arg != NULL){
347
char *p;
348
while((p = strsep(&arg, ",")) != NULL){
349
if(p[0] == '\0'){
350
continue;
351
}
352
if(not add_argument(getplugin(NULL, plugins), p)){
353
perror("add_argument");
354
return ARGP_ERR_UNKNOWN;
355
}
356
}
357
}
358
break;
359
case 'e':
360
if(arg == NULL){
361
break;
362
}
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
371
}
372
break;
373
case 'o':
374
if (arg != NULL){
375
char *p_name = strsep(&arg, ":");
376
if(p_name[0] == '\0'){
377
break;
378
}
379
char *opt = strsep(&arg, ":");
380
if(opt[0] == '\0'){
381
break;
382
}
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
}
396
break;
397
case 'f':
398
if(arg == NULL){
399
break;
400
}
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
453
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
468
break;
469
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
491
}
492
break;
493
case 'E': /* --env-for */
401
494
{
402
495
char *envdef = strchr(arg, ':');
403
496
if(envdef == NULL){
404
break;
405
}
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
410
502
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
412
perror("add_environment");
413
}
414
}
415
break;
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
419
if(p == NULL){
420
return ARGP_ERR_UNKNOWN;
421
}
422
p->disabled = true;
423
}
424
break;
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
429
uid = (uid_t)strtol(arg, NULL, 10);
430
break;
431
case 130:
432
gid = (gid_t)strtol(arg, NULL, 10);
433
break;
434
case 131:
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
511
}
512
break;
513
case 'd': /* --disable */
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
529
}
530
break;
531
case 128: /* --plugin-dir */
532
free(plugindir);
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
break;
538
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
541
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
break;
552
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
break;
563
case 132: /* --debug */
435
564
debug = true;
436
565
break;
437
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
break;
633
case 130: /* --userid */
634
case 131: /* --groupid */
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
case ARGP_KEY_ARG:
641
break;
642
default:
643
return ARGP_ERR_UNKNOWN;
644
}
645
return errno;
646
}
647
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
452
651
.doc = "Mandos plugin runner -- Run plugins" };
453
652
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
456
fprintf(stderr, "Unknown error while parsing arguments\n");
457
exitstatus = EXIT_FAILURE;
458
goto fallback;
459
}
460
461
conffp = fopen(argfile, "r");
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
669
goto fallback;
670
}
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
/* Open the configfile if available */
676
if(argfile == NULL){
677
conffp = fopen(AFILE, "r");
678
} else {
679
conffp = fopen(argfile, "r");
680
}
462
681
if(conffp != NULL){
463
682
char *org_line = NULL;
464
683
char *p, *arg, *new_arg, *line;
465
684
size_t size = 0;
466
ssize_t sret;
467
685
const char whitespace_delims[] = " \r\t\f\v\n";
468
686
const char comment_delim[] = "#";
469
687
688
custom_argc = 1;
689
custom_argv = malloc(sizeof(char*) * 2);
690
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
693
goto fallback;
694
}
695
custom_argv[0] = argv[0];
696
custom_argv[1] = NULL;
697
698
/* for each line in the config file, strip whitespace and ignore
699
commented text */
470
700
while(true){
471
701
sret = getline(&org_line, &size, conffp);
472
702
if(sret == -1){
473
703
break;
474
704
}
475
705
476
706
line = org_line;
477
707
arg = strsep(&line, comment_delim);
478
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
480
710
continue;
481
711
}
482
712
new_arg = strdup(p);
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
713
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
716
free(org_line);
487
717
goto fallback;
488
718
}
719
720
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
744
}
745
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
489
747
}
490
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
491
757
free(org_line);
492
} else{
758
} else {
493
759
/* Check for harmful errors and go to fallback. Other errors might
494
760
not affect opening plugins */
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
496
perror("fopen");
497
exitstatus = EXIT_FAILURE;
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
498
764
goto fallback;
499
765
}
500
766
}
501
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
502
769
if(custom_argv != NULL){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
505
if (ret == ARGP_ERR_UNKNOWN){
506
fprintf(stderr, "Unknown error while parsing arguments\n");
507
exitstatus = EXIT_FAILURE;
508
goto fallback;
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
784
goto fallback;
785
}
786
}
787
788
/* Parse actual command line arguments, to let them override the
789
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
509
822
}
510
823
}
511
824
512
825
if(debug){
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
514
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
515
828
p->name ? p->name : "Global", p->argc - 1);
516
829
for(char **a = p->argv; *a != NULL; a++){
517
830
fprintf(stderr, "\tArg: %s\n", *a);
518
831
}
519
fprintf(stderr, "...and %u environment variables\n", p->envc);
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
520
833
for(char **a = p->environ; *a != NULL; a++){
521
834
fprintf(stderr, "\t%s\n", *a);
522
835
}
523
836
}
524
837
}
525
838
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
526
868
ret = setuid(uid);
527
if (ret == -1){
528
perror("setuid");
529
}
530
531
setgid(gid);
532
if (ret == -1){
533
perror("setgid");
534
}
535
536
dir = opendir(plugindir);
537
if(dir == NULL){
538
perror("Could not open plugin dir");
539
exitstatus = EXIT_FAILURE;
540
goto fallback;
541
}
542
543
/* Set the FD_CLOEXEC flag on the directory, if possible */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
544
874
{
545
int dir_fd = dirfd(dir);
546
if(dir_fd >= 0){
547
ret = set_cloexec_flag(dir_fd);
548
if(ret < 0){
549
perror("set_cloexec_flag");
550
exitstatus = EXIT_FAILURE;
551
goto fallback;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
552
919
}
553
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
554
931
}
555
932
556
933
FD_ZERO(&rfds_all);
557
934
558
while(true){
559
dirst = readdir(dir);
560
561
// All directory entries have been processed
562
if(dirst == NULL){
563
if (errno == EBADF){
564
perror("readdir");
565
exitstatus = EXIT_FAILURE;
566
goto fallback;
567
}
568
break;
569
}
570
571
d_name_len = strlen(dirst->d_name);
572
573
// Ignore dotfiles, backup files and other junk
574
{
575
bool bad_name = false;
576
577
const char const *bad_prefixes[] = { ".", "#", NULL };
578
579
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
580
".dpkg-old",
581
".dpkg-divert", NULL };
582
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
583
size_t pre_len = strlen(*pre);
584
if((d_name_len >= pre_len)
585
and strncmp((dirst->d_name), *pre, pre_len) == 0){
586
if(debug){
587
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
588
" with bad prefix %s\n", dirst->d_name, *pre);
589
}
590
bad_name = true;
591
break;
592
}
593
}
594
595
if(bad_name){
596
continue;
597
}
598
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
600
size_t suf_len = strlen(*suf);
601
if((d_name_len >= suf_len)
602
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
603
== 0)){
604
if(debug){
605
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
606
" with bad suffix %s\n", dirst->d_name, *suf);
607
}
608
bad_name = true;
609
break;
610
}
611
}
612
613
if(bad_name){
614
continue;
615
}
616
}
617
618
char *filename;
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
620
if(ret < 0){
621
perror("asprintf");
622
continue;
623
}
624
625
ret = stat(filename, &st);
626
if (ret == -1){
627
perror("stat");
628
free(filename);
629
continue;
630
}
631
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
935
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
952
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
633
956
if(debug){
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
635
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
636
961
}
637
free(filename);
962
close(plugin_fd);
963
free(direntries[i]);
638
964
continue;
639
965
}
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
966
967
plugin *p = getplugin(direntries[i]->d_name);
641
968
if(p == NULL){
642
perror("getplugin");
643
free(filename);
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
644
972
continue;
645
973
}
646
974
if(p->disabled){
647
975
if(debug){
648
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
649
dirst->d_name);
977
direntries[i]->d_name);
650
978
}
651
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
652
981
continue;
653
982
}
654
983
{
655
984
/* Add global arguments to argument list for this plugin */
656
plugin *g = getplugin(NULL, &plugin_list);
985
plugin *g = getplugin(NULL);
657
986
if(g != NULL){
658
987
for(char **a = g->argv + 1; *a != NULL; a++){
659
988
if(not add_argument(p, *a)){
660
perror("add_argument");
989
error(0, errno, "add_argument");
661
990
}
662
991
}
663
992
/* Add global environment variables */
664
993
for(char **e = g->environ; *e != NULL; e++){
665
if(not add_environment(p, *e)){
666
perror("add_environment");
994
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
667
996
}
668
997
}
669
998
}
670
999
}
671
/* If this plugin has any environment variables, we will call
672
using execve and need to duplicate the environment from this
673
process, too. */
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
674
1002
if(p->environ[0] != NULL){
675
1003
for(char **e = environ; *e != NULL; e++){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
682
perror("add_environment");
1004
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
683
1006
}
684
1007
}
685
1008
}
686
1009
687
1010
int pipefd[2];
688
ret = pipe(pipefd);
689
if (ret == -1){
690
perror("pipe");
691
exitstatus = EXIT_FAILURE;
692
goto fallback;
693
}
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
1032
/* Ask OS to automatic close the pipe on exec */
694
1033
ret = set_cloexec_flag(pipefd[0]);
695
1034
if(ret < 0){
696
perror("set_cloexec_flag");
697
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
698
1040
goto fallback;
699
1041
}
700
1042
ret = set_cloexec_flag(pipefd[1]);
701
1043
if(ret < 0){
702
perror("set_cloexec_flag");
703
exitstatus = EXIT_FAILURE;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
704
1049
goto fallback;
705
1050
}
1051
#endif /* not O_CLOEXEC */
706
1052
/* Block SIGCHLD until process is safely in process list */
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
708
1056
if(ret < 0){
709
perror("sigprocmask");
710
exitstatus = EXIT_FAILURE;
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
711
1060
goto fallback;
712
1061
}
713
// Starting a new process to be watched
714
pid_t pid = fork();
1062
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
715
1067
if(pid == -1){
716
perror("fork");
717
exitstatus = EXIT_FAILURE;
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
718
1075
goto fallback;
719
1076
}
720
1077
if(pid == 0){
721
1078
/* this is the child process */
722
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
723
1080
if(ret < 0){
724
perror("sigaction");
725
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
726
1083
}
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
728
1085
if(ret < 0){
729
perror("sigprocmask");
730
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
731
1088
}
732
1089
733
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
734
1091
if(ret == -1){
735
perror("dup2");
736
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
737
1094
}
738
1095
739
if(dirfd(dir) < 0){
740
/* If dir has no file descriptor, we could not set FD_CLOEXEC
741
above and must now close it manually here. */
742
closedir(dir);
743
}
744
if(p->environ[0] == NULL){
745
if(execv(filename, p->argv) < 0){
746
perror("execv");
747
_exit(EXIT_FAILURE);
748
}
749
} else {
750
if(execve(filename, p->argv, p->environ) < 0){
751
perror("execve");
752
_exit(EXIT_FAILURE);
753
}
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
754
1102
}
755
1103
/* no return */
756
1104
}
757
/* parent process */
758
free(filename);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1105
/* Parent process */
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
764
1114
if(ret < 0){
765
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
766
1116
}
767
exitstatus = EXIT_FAILURE;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
768
1119
goto fallback;
769
1120
}
1121
free(direntries[i]);
770
1122
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
1123
new_plugin->pid = pid;
1124
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
776
1131
/* Unblock SIGCHLD so signal handler can be run if this process
777
1132
has already completed */
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
779
1136
if(ret < 0){
780
perror("sigprocmask");
781
exitstatus = EXIT_FAILURE;
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
782
1139
goto fallback;
783
1140
}
784
1141
785
FD_SET(new_process->fd, &rfds_all);
786
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
789
}
790
791
}
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
796
closedir(dir);
797
dir = NULL;
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
803
}
804
while(process_list){
1142
FD_SET(new_plugin->fd, &rfds_all);
1143
1144
if(maxfd < new_plugin->fd){
1145
maxfd = new_plugin->fd;
1146
}
1147
}
1148
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
if(p->pid != 0){
1157
break;
1158
}
1159
if(p->next == NULL){
1160
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1161
" directory?\n");
1162
free_plugin_list();
1163
}
1164
}
1165
1166
/* Main loop while running plugins exist */
1167
while(plugin_list){
805
1168
fd_set rfds = rfds_all;
806
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
807
if (select_ret == -1){
808
perror("select");
809
exitstatus = EXIT_FAILURE;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
810
1173
goto fallback;
811
1174
}
812
1175
/* OK, now either a process completed, or something can be read
813
1176
from one of them */
814
for(process *proc = process_list; proc ; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
815
1178
/* Is this process completely done? */
816
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
817
1180
/* Only accept the plugin output if it exited cleanly */
818
1181
if(not WIFEXITED(proc->status)
819
1182
or WEXITSTATUS(proc->status) != 0){
820
1183
/* Bad exit by plugin */
1184
821
1185
if(debug){
822
1186
if(WIFEXITED(proc->status)){
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
825
1190
WEXITSTATUS(proc->status));
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
829
WTERMSIG(proc->status));
830
} else if(WCOREDUMP(proc->status)){
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
833
1197
}
834
1198
}
1199
835
1200
/* Remove the plugin */
836
1201
FD_CLR(proc->fd, &rfds_all);
1202
837
1203
/* Block signal while modifying process_list */
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
839
1208
if(ret < 0){
840
perror("sigprocmask");
841
exitstatus = EXIT_FAILURE;
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
842
1211
goto fallback;
843
1212
}
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
1213
1214
plugin *next_plugin = proc->next;
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
857
1218
/* We are done modifying process list, so unblock signal */
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
860
1222
if(ret < 0){
861
perror("sigprocmask");
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
1226
}
1227
1228
if(plugin_list == NULL){
1229
break;
1230
}
1231
1232
continue;
869
1233
}
1234
870
1235
/* This process exited nicely, so print its buffer */
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1236
1237
bool bret = print_out_password(proc->buffer,
1238
proc->buffer_length);
873
1239
if(not bret){
874
perror("print_out_password");
875
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
876
1242
}
877
1243
goto fallback;
878
1244
}
1245
879
1246
/* This process has not completed. Does it have any output? */
880
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
881
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
882
1250
continue;
883
1251
}
884
1252
/* Before reading, make the process' data buffer large enough */
885
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
887
+ (size_t) BUFFER_SIZE);
888
if (proc->buffer == NULL){
889
perror("malloc");
890
exitstatus = EXIT_FAILURE;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
891
1259
goto fallback;
892
1260
}
1261
proc->buffer = new_buffer;
893
1262
proc->buffer_size += BUFFER_SIZE;
894
1263
}
895
1264
/* Read from the process */
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
899
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
900
1272
continue;
901
1273
}
902
if(ret == 0){
1274
if(sret == 0){
903
1275
/* got EOF */
904
1276
proc->eof = true;
905
1277
} else {
906
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
907
1279
}
908
1280
}
909
1281
}
910
911
1282
1283
912
1284
fallback:
913
1285
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1288
/* Fallback if all plugins failed, none are found or an error
1289
occured */
916
1290
bool bret;
917
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
918
1292
char *passwordbuffer = getpass("Password: ");
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
920
1300
if(not bret){
921
perror("print_out_password");
922
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
923
1303
}
924
1304
}
925
1305
926
1306
/* Restore old signal handler */
927
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
928
1308
if(ret == -1){
929
perror("sigaction");
930
exitstatus = EXIT_FAILURE;
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
931
1311
}
932
1312
933
1313
if(custom_argv != NULL){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
935
1315
free(*arg);
936
1316
}
937
1317
free(custom_argv);
938
1318
}
939
free_plugin_list(plugin_list);
940
941
if(dir != NULL){
942
closedir(dir);
1319
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
943
1324
}
944
1325
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1326
/* Kill the processes */
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1328
if(p->pid != 0){
1329
close(p->fd);
1330
ret = kill(p->pid, SIGTERM);
1331
if(ret == -1 and errno != ESRCH){
1332
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1334
}
953
1335
}
954
free(process_list->buffer);
955
free(process_list);
956
1336
}
957
1337
958
1338
/* Wait for any remaining child processes to terminate */
959
do{
1339
do {
960
1340
ret = wait(NULL);
961
1341
} while(ret >= 0);
962
1342
if(errno != ECHILD){
963
perror("wait");
1343
error(0, errno, "wait");
964
1344
}
965
1345
1346
free_plugin_list();
1347
1348
free(plugindir);
1349
free(pluginhelperdir);
1350
free(argfile);
1351
966
1352
return exitstatus;
967
1353
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0