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- Committer: Teddy Hogeborn
- Date: 2008-12-10 01:26:02 UTC
- mfrom: (237.1.2 mandos)
- Revision ID: teddy@fukt.bsnet.se-20081210012602-vhz3h75xkj24t340
First version of a somewhat complete D-Bus server interface. Also
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf() */
28
27
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
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() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
43
#include <iso646.h> /* and, or, not */
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
*/
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
readdir(), closedir(), dirfd() */
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
47
fcntl(), setuid(), setgid(),
48
F_GETFD, F_SETFD, FD_CLOEXEC,
49
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
51
execv(), write(), read(),
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
63
62
#include <signal.h> /* struct sigaction, sigemptyset(),
64
63
sigaddset(), sigaction(),
65
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
SIG_UNBLOCK, kill() */
68
66
#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() */
75
67
76
68
#define BUFFER_SIZE 256
77
69
78
70
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
72
82
73
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
75
85
76
typedef struct plugin{
86
77
char *name; /* can be NULL or any plugin name */
89
80
char **environ;
90
81
int envc;
91
82
bool disabled;
92
83
93
84
/* Variables used for running processes*/
94
85
pid_t pid;
95
86
int fd;
97
88
size_t buffer_size;
98
89
size_t buffer_length;
99
90
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
91
volatile bool completed;
92
volatile int status;
102
93
struct plugin *next;
103
94
} plugin;
104
95
106
97
107
98
/* Gets an existing plugin based on name,
108
99
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
100
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))){
101
/* Check for exiting plugin with that name */
102
for (plugin *p = plugin_list; p != NULL; p = p->next){
103
if ((p->name == name)
104
or (p->name and name and (strcmp(p->name, name) == 0))){
115
105
return p;
116
106
}
117
107
}
118
108
/* Create a new plugin */
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){
109
plugin *new_plugin = malloc(sizeof(plugin));
110
if (new_plugin == NULL){
124
111
return NULL;
125
112
}
126
113
char *copy_name = NULL;
127
114
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
115
copy_name = strdup(name);
131
116
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
117
return NULL;
136
118
}
137
119
}
138
120
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
121
*new_plugin = (plugin) { .name = copy_name,
122
.argc = 1,
123
.disabled = false,
124
.next = plugin_list };
143
125
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;
126
new_plugin->argv = malloc(sizeof(char *) * 2);
127
if (new_plugin->argv == NULL){
149
128
free(copy_name);
150
129
free(new_plugin);
151
errno = e;
152
130
return NULL;
153
131
}
154
132
new_plugin->argv[0] = copy_name;
155
133
new_plugin->argv[1] = NULL;
156
134
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
new_plugin->environ = malloc(sizeof(char *));
160
136
if(new_plugin->environ == NULL){
161
int e = errno;
162
137
free(copy_name);
163
138
free(new_plugin->argv);
164
139
free(new_plugin);
165
errno = e;
166
140
return NULL;
167
141
}
168
142
new_plugin->environ[0] = NULL;
173
147
}
174
148
175
149
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
150
static bool add_to_char_array(const char *new, char ***array,
178
151
int *len){
179
152
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
185
155
/* Malloc check */
186
if(new_array == NULL){
156
if(*array == NULL){
187
157
return false;
188
158
}
189
*array = new_array;
190
159
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
195
161
if(copy == NULL){
196
162
return false;
197
163
}
204
170
}
205
171
206
172
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
173
static bool add_argument(plugin *p, const char *arg){
209
174
if(p == NULL){
210
175
return false;
213
178
}
214
179
215
180
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
181
static bool add_environment(plugin *p, const char *def, bool replace){
218
182
if(p == NULL){
219
183
return false;
221
185
/* namelen = length of name of environment variable */
222
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
187
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
226
190
/* It already exists */
227
191
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
233
194
return false;
234
195
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
237
198
}
238
199
return true;
239
200
}
241
202
return add_to_char_array(def, &(p->environ), &(p->envc));
242
203
}
243
204
244
#ifndef O_CLOEXEC
245
205
/*
246
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
207
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
209
*/
250
__attribute__((warn_unused_result))
251
210
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
253
212
/* If reading the flags failed, return error indication now. */
254
213
if(ret < 0){
255
214
return ret;
256
215
}
257
216
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
218
}
261
#endif /* not O_CLOEXEC */
262
219
263
220
264
221
/* Mark processes as completed when they exit, and save their exit
265
222
status. */
266
223
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
224
while(true){
269
225
plugin *proc = plugin_list;
270
226
int status;
274
230
break;
275
231
}
276
232
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
233
if (errno != ECHILD){
234
perror("waitpid");
280
235
}
281
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
282
238
}
283
239
284
240
/* A child exited, find it in process_list */
290
246
continue;
291
247
}
292
248
proc->status = status;
293
proc->completed = 1;
249
proc->completed = true;
294
250
}
295
errno = old_errno;
296
251
}
297
252
298
253
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
254
static bool print_out_password(const char *buffer, size_t length){
301
255
ssize_t ret;
302
256
for(size_t written = 0; written < length; written += (size_t)ret){
310
264
}
311
265
312
266
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
267
static void free_plugin(plugin *plugin_node){
315
268
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
270
free(*arg);
318
271
}
319
free(plugin_node->name);
320
272
free(plugin_node->argv);
321
273
for(char **env = plugin_node->environ; *env != NULL; env++){
322
274
free(*env);
323
275
}
324
276
free(plugin_node->environ);
325
277
free(plugin_node->buffer);
326
278
327
279
/* Removes the plugin from the singly-linked list */
328
280
if(plugin_node == plugin_list){
329
281
/* First one - simple */
349
301
350
302
int main(int argc, char *argv[]){
351
303
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
304
char *argfile = NULL;
354
305
FILE *conffp;
355
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
356
309
struct stat st;
357
310
fd_set rfds_all;
358
311
int ret, maxfd = 0;
359
ssize_t sret;
360
312
uid_t uid = 65534;
361
313
gid_t gid = 65534;
362
314
bool debug = false;
366
318
.sa_flags = SA_NOCLDSTOP };
367
319
char **custom_argv = NULL;
368
320
int custom_argc = 0;
369
int dir_fd = -1;
370
321
371
322
/* Establish a signal handler */
372
323
sigemptyset(&sigchld_action.sa_mask);
373
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
325
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
377
328
goto fallback;
378
329
}
379
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
331
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
383
334
goto fallback;
384
335
}
385
336
417
368
.doc = "Group ID the plugins will run as", .group = 3 },
418
369
{ .name = "debug", .key = 132,
419
370
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
433
371
{ .name = NULL }
434
372
};
435
373
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
442
377
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
378
if (arg != NULL){
379
char *p;
380
while((p = strsep(&arg, ",")) != NULL){
381
if(p[0] == '\0'){
382
continue;
383
}
384
if(not add_argument(getplugin(NULL), p)){
385
perror("add_argument");
386
return ARGP_ERR_UNKNOWN;
448
387
}
449
388
}
450
errno = 0;
451
389
}
452
390
break;
453
391
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
456
397
}
457
398
break;
458
399
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
400
if (arg != NULL){
401
char *p_name = strsep(&arg, ":");
402
if(p_name[0] == '\0' or arg == NULL){
403
break;
404
}
405
char *opt = strsep(&arg, ":");
406
if(opt[0] == '\0' or opt == NULL){
407
break;
408
}
409
char *p;
410
while((p = strsep(&opt, ",")) != NULL){
411
if(p[0] == '\0'){
412
continue;
413
}
414
if(not add_argument(getplugin(p_name), p)){
415
perror("add_argument");
416
return ARGP_ERR_UNKNOWN;
417
}
418
}
480
419
}
481
420
break;
482
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
483
425
{
484
426
char *envdef = strchr(arg, ':');
485
427
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
428
break;
489
429
}
490
430
*envdef = '\0';
491
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
499
433
}
500
434
}
501
435
break;
502
436
case 'd': /* --disable */
503
{
437
if (arg != NULL){
504
438
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
508
441
}
442
p->disabled = true;
509
443
}
510
444
break;
511
445
case 'e': /* --enable */
512
{
446
if (arg != NULL){
513
447
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
517
450
}
451
p->disabled = false;
518
452
}
519
453
break;
520
454
case 128: /* --plugin-dir */
521
455
free(plugindir);
522
456
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
457
if(plugindir == NULL){
458
perror("strdup");
459
}
526
460
break;
527
461
case 129: /* --config-file */
528
462
/* This is already done by parse_opt_config_file() */
529
463
break;
530
464
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
465
uid = (uid_t)strtol(arg, NULL, 10);
540
466
break;
541
467
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
468
gid = (gid_t)strtol(arg, NULL, 10);
551
469
break;
552
470
case 132: /* --debug */
553
471
debug = true;
554
472
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
473
case ARGP_KEY_ARG:
583
474
/* Cryptsetup always passes an argument, which is an empty
584
475
string if "none" was specified in /etc/crypttab. So if
585
476
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
588
479
}
589
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
480
break;
481
case ARGP_KEY_END:
482
break;
594
483
default:
595
484
return ARGP_ERR_UNKNOWN;
596
485
}
597
return errno; /* Set to 0 at start */
486
return 0;
598
487
}
599
488
600
489
/* This option parser is the same as parse_opt() above, except it
601
490
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
607
495
case 'g': /* --global-options */
608
496
case 'G': /* --global-env */
609
497
case 'o': /* --options-for */
615
503
case 129: /* --config-file */
616
504
free(argfile);
617
505
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
506
if(argfile == NULL){
507
perror("strdup");
620
508
}
621
break;
509
break;
622
510
case 130: /* --userid */
623
511
case 131: /* --groupid */
624
512
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
629
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
630
515
break;
631
516
default:
632
517
return ARGP_ERR_UNKNOWN;
633
518
}
634
return errno;
519
return 0;
635
520
}
636
521
637
522
struct argp argp = { .options = options,
639
524
.args_doc = "",
640
525
.doc = "Mandos plugin runner -- Run plugins" };
641
526
642
/* Parse using parse_opt_config_file() in order to get the custom
527
/* Parse using the parse_opt_config_file in order to get the custom
643
528
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
530
if (ret == ARGP_ERR_UNKNOWN){
531
fprintf(stderr, "Unknown error while parsing arguments\n");
532
exitstatus = EXIT_FAILURE;
658
533
goto fallback;
659
534
}
660
535
662
537
argp.parser = parse_opt;
663
538
664
539
/* Open the configfile if available */
665
if(argfile == NULL){
540
if (argfile == NULL){
666
541
conffp = fopen(AFILE, "r");
667
542
} else {
668
543
conffp = fopen(argfile, "r");
669
}
544
}
670
545
if(conffp != NULL){
671
546
char *org_line = NULL;
672
547
char *p, *arg, *new_arg, *line;
673
548
size_t size = 0;
549
ssize_t sret;
674
550
const char whitespace_delims[] = " \r\t\f\v\n";
675
551
const char comment_delim[] = "#";
676
552
677
553
custom_argc = 1;
678
554
custom_argv = malloc(sizeof(char*) * 2);
679
555
if(custom_argv == NULL){
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
682
558
goto fallback;
683
559
}
684
560
custom_argv[0] = argv[0];
685
561
custom_argv[1] = NULL;
686
562
687
563
/* for each line in the config file, strip whitespace and ignore
688
564
commented text */
689
565
while(true){
691
567
if(sret == -1){
692
568
break;
693
569
}
694
570
695
571
line = org_line;
696
572
arg = strsep(&line, comment_delim);
697
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
700
576
}
701
577
new_arg = strdup(p);
702
578
if(new_arg == NULL){
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
705
581
free(org_line);
706
582
goto fallback;
707
583
}
708
584
709
585
custom_argc += 1;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
722
593
}
723
594
custom_argv[custom_argc-1] = new_arg;
724
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
725
596
}
726
597
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
735
598
free(org_line);
736
599
} else {
737
600
/* Check for harmful errors and go to fallback. Other errors might
738
601
not affect opening plugins */
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
742
605
goto fallback;
743
606
}
744
607
}
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
747
610
if(custom_argv != NULL){
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
613
if (ret == ARGP_ERR_UNKNOWN){
614
fprintf(stderr, "Unknown error while parsing arguments\n");
615
exitstatus = EXIT_FAILURE;
762
616
goto fallback;
763
617
}
764
618
}
765
619
766
620
/* Parse actual command line arguments, to let them override the
767
621
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
800
}
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
801
627
}
802
628
803
629
if(debug){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
805
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
806
632
p->name ? p->name : "Global", p->argc - 1);
807
633
for(char **a = p->argv; *a != NULL; a++){
808
634
fprintf(stderr, "\tArg: %s\n", *a);
809
635
}
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
811
637
for(char **a = p->environ; *a != NULL; a++){
812
638
fprintf(stderr, "\t%s\n", *a);
813
639
}
814
640
}
815
641
}
816
642
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
643
/* Strip permissions down to nobody */
846
644
ret = setuid(uid);
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
645
if (ret == -1){
646
perror("setuid");
647
}
648
setgid(gid);
649
if (ret == -1){
650
perror("setgid");
651
}
652
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
659
if(dir == NULL){
660
perror("Could not open plugin dir");
661
exitstatus = EXIT_FAILURE;
662
goto fallback;
663
}
664
665
/* Set the FD_CLOEXEC flag on the directory, if possible */
852
666
{
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
667
int dir_fd = dirfd(dir);
668
if(dir_fd >= 0){
669
ret = set_cloexec_flag(dir_fd);
670
if(ret < 0){
671
perror("set_cloexec_flag");
672
exitstatus = EXIT_FAILURE;
673
goto fallback;
897
674
}
898
675
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
909
676
}
910
677
911
678
FD_ZERO(&rfds_all);
912
679
913
680
/* Read and execute any executable in the plugin directory*/
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
681
while(true){
682
dirst = readdir(dir);
683
684
/* All directory entries have been processed */
685
if(dirst == NULL){
686
if (errno == EBADF){
687
perror("readdir");
688
exitstatus = EXIT_FAILURE;
689
goto fallback;
690
}
691
break;
692
}
693
694
d_name_len = strlen(dirst->d_name);
695
696
/* Ignore dotfiles, backup files and other junk */
697
{
698
bool bad_name = false;
699
700
const char const *bad_prefixes[] = { ".", "#", NULL };
701
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
703
".dpkg-old",
704
".dpkg-bak",
705
".dpkg-divert", NULL };
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
707
size_t pre_len = strlen(*pre);
708
if((d_name_len >= pre_len)
709
and strncmp((dirst->d_name), *pre, pre_len) == 0){
710
if(debug){
711
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
712
" with bad prefix %s\n", dirst->d_name, *pre);
713
}
714
bad_name = true;
715
break;
716
}
717
}
718
if(bad_name){
719
continue;
720
}
721
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
722
size_t suf_len = strlen(*suf);
723
if((d_name_len >= suf_len)
724
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
725
== 0)){
726
if(debug){
727
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
728
" with bad suffix %s\n", dirst->d_name, *suf);
729
}
730
bad_name = true;
731
break;
732
}
733
}
734
735
if(bad_name){
736
continue;
737
}
738
}
739
740
char *filename;
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
743
} else {
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
745
}
746
if(ret < 0){
747
perror("asprintf");
748
continue;
749
}
750
751
ret = stat(filename, &st);
752
if (ret == -1){
753
perror("stat");
754
free(filename);
755
continue;
756
}
757
930
758
/* Ignore non-executable files */
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
934
760
if(debug){
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
939
763
}
940
close(plugin_fd);
941
free(direntries[i]);
764
free(filename);
942
765
continue;
943
766
}
944
767
945
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
946
769
if(p == NULL){
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
950
772
continue;
951
773
}
952
774
if(p->disabled){
953
775
if(debug){
954
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
955
direntries[i]->d_name);
777
dirst->d_name);
956
778
}
957
close(plugin_fd);
958
free(direntries[i]);
779
free(filename);
959
780
continue;
960
781
}
961
782
{
964
785
if(g != NULL){
965
786
for(char **a = g->argv + 1; *a != NULL; a++){
966
787
if(not add_argument(p, *a)){
967
error(0, errno, "add_argument");
788
perror("add_argument");
968
789
}
969
790
}
970
791
/* Add global environment variables */
971
792
for(char **e = g->environ; *e != NULL; e++){
972
793
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
794
perror("add_environment");
974
795
}
975
796
}
976
797
}
977
798
}
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
799
/* If this plugin has any environment variables, we will call
800
using execve and need to duplicate the environment from this
801
process, too. */
980
802
if(p->environ[0] != NULL){
981
803
for(char **e = environ; *e != NULL; e++){
982
804
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
805
perror("add_environment");
984
806
}
985
807
}
986
808
}
987
809
988
810
int pipefd[2];
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1010
817
/* Ask OS to automatic close the pipe on exec */
1011
818
ret = set_cloexec_flag(pipefd[0]);
1012
819
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1018
822
goto fallback;
1019
823
}
1020
824
ret = set_cloexec_flag(pipefd[1]);
1021
825
if(ret < 0){
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1027
828
goto fallback;
1028
829
}
1029
#endif /* not O_CLOEXEC */
1030
830
/* Block SIGCHLD until process is safely in process list */
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1034
832
if(ret < 0){
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1038
835
goto fallback;
1039
836
}
1040
837
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1045
839
if(pid == -1){
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1053
842
goto fallback;
1054
843
}
1055
844
if(pid == 0){
1056
845
/* this is the child process */
1057
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
847
if(ret < 0){
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1061
850
}
1062
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1063
852
if(ret < 0){
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1066
855
}
1067
856
1068
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1069
858
if(ret == -1){
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1072
861
}
1073
862
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
863
if(dirfd(dir) < 0){
864
/* If dir has no file descriptor, we could not set FD_CLOEXEC
865
above and must now close it manually here. */
866
closedir(dir);
867
}
868
if(p->environ[0] == NULL){
869
if(execv(filename, p->argv) < 0){
870
perror("execv");
871
_exit(EXIT_FAILURE);
872
}
873
} else {
874
if(execve(filename, p->argv, p->environ) < 0){
875
perror("execve");
876
_exit(EXIT_FAILURE);
877
}
1080
878
}
1081
879
/* no return */
1082
880
}
1083
881
/* Parent process */
1084
882
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
883
free(filename);
884
plugin *new_plugin = getplugin(dirst->d_name);
885
if (new_plugin == NULL){
886
perror("getplugin");
887
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1092
888
if(ret < 0){
1093
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1094
890
}
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1097
892
goto fallback;
1098
893
}
1099
free(direntries[i]);
1100
894
1101
895
new_plugin->pid = pid;
1102
896
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
897
1109
898
/* Unblock SIGCHLD so signal handler can be run if this process
1110
899
has already completed */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
901
if(ret < 0){
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1117
904
goto fallback;
1118
905
}
1119
906
1120
907
FD_SET(new_plugin->fd, &rfds_all);
1121
908
1122
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1123
910
maxfd = new_plugin->fd;
1124
911
}
1125
912
}
1126
913
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1132
916
1133
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1134
918
if(p->pid != 0){
1145
929
while(plugin_list){
1146
930
fd_set rfds = rfds_all;
1147
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1151
935
goto fallback;
1152
936
}
1153
937
/* OK, now either a process completed, or something can be read
1154
938
from one of them */
1155
939
for(plugin *proc = plugin_list; proc != NULL;){
1156
940
/* Is this process completely done? */
1157
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1158
942
/* Only accept the plugin output if it exited cleanly */
1159
943
if(not WIFEXITED(proc->status)
1160
944
or WEXITSTATUS(proc->status) != 0){
1161
945
/* Bad exit by plugin */
1162
946
1163
947
if(debug){
1164
948
if(WIFEXITED(proc->status)){
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1168
951
WEXITSTATUS(proc->status));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
952
} else if(WIFSIGNALED(proc->status)) {
953
fprintf(stderr, "Plugin %u killed by signal %d\n",
954
(unsigned int) (proc->pid),
955
WTERMSIG(proc->status));
956
} else if(WCOREDUMP(proc->status)){
957
fprintf(stderr, "Plugin %d dumped core\n",
958
(unsigned int) (proc->pid));
1175
959
}
1176
960
}
1177
961
1178
962
/* Remove the plugin */
1179
963
FD_CLR(proc->fd, &rfds_all);
1180
964
1181
965
/* Block signal while modifying process_list */
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1186
967
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1189
970
goto fallback;
1190
971
}
1191
972
1194
975
proc = next_plugin;
1195
976
1196
977
/* We are done modifying process list, so unblock signal */
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1200
980
if(ret < 0){
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1203
983
goto fallback;
1204
984
}
1205
985
1215
995
bool bret = print_out_password(proc->buffer,
1216
996
proc->buffer_length);
1217
997
if(not bret){
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1220
1000
}
1221
1001
goto fallback;
1222
1002
}
1229
1009
}
1230
1010
/* Before reading, make the process' data buffer large enough */
1231
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
1012
proc->buffer = realloc(proc->buffer, proc->buffer_size
1013
+ (size_t) BUFFER_SIZE);
1014
if (proc->buffer == NULL){
1015
perror("malloc");
1016
exitstatus = EXIT_FAILURE;
1237
1017
goto fallback;
1238
1018
}
1239
proc->buffer = new_buffer;
1240
1019
proc->buffer_size += BUFFER_SIZE;
1241
1020
}
1242
1021
/* Read from the process */
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1248
1025
/* Read error from this process; ignore the error */
1249
1026
proc = proc->next;
1250
1027
continue;
1251
1028
}
1252
if(sret == 0){
1029
if(ret == 0){
1253
1030
/* got EOF */
1254
1031
proc->eof = true;
1255
1032
} else {
1256
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1257
1034
}
1258
1035
}
1259
1036
}
1260
1261
1037
1038
1262
1039
fallback:
1263
1040
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1266
1042
/* Fallback if all plugins failed, none are found or an error
1267
1043
occured */
1268
1044
bool bret;
1276
1052
}
1277
1053
bret = print_out_password(passwordbuffer, len);
1278
1054
if(not bret){
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1281
1057
}
1282
1058
}
1283
1059
1284
1060
/* Restore old signal handler */
1285
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
1062
if(ret == -1){
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1289
1065
}
1290
1066
1291
1067
if(custom_argv != NULL){
1295
1071
free(custom_argv);
1296
1072
}
1297
1073
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1302
1076
}
1303
1077
1304
1078
/* Kill the processes */
1308
1082
ret = kill(p->pid, SIGTERM);
1309
1083
if(ret == -1 and errno != ESRCH){
1310
1084
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1085
perror("kill");
1312
1086
}
1313
1087
}
1314
1088
}
1315
1089
1316
1090
/* Wait for any remaining child processes to terminate */
1317
do {
1091
do{
1318
1092
ret = wait(NULL);
1319
1093
} while(ret >= 0);
1320
1094
if(errno != ECHILD){
1321
error(0, errno, "wait");
1095
perror("wait");
1322
1096
}
1323
1097
1324
1098
free_plugin_list();
1325
1099
1326
1100
free(plugindir);
1327
free(pluginhelperdir);
1328
1101
free(argfile);
1329
1102
1330
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0