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- Committer: Teddy Hogeborn
- Date: 2008-12-10 01:26:02 UTC
- mfrom: (237.1.2 mandos)
- mto: (24.1.114 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 238.
- 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/upstream
- 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
/* FALLTHROUGH */
480
break;
481
case ARGP_KEY_END:
482
break;
590
483
default:
591
484
return ARGP_ERR_UNKNOWN;
592
485
}
593
return errno; /* Set to 0 at start */
486
return 0;
594
487
}
595
488
596
489
/* This option parser is the same as parse_opt() above, except it
597
490
ignores everything but the --config-file option. */
598
error_t parse_opt_config_file(int key, char *arg,
599
__attribute__((unused))
600
struct argp_state *state){
601
errno = 0;
602
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
603
495
case 'g': /* --global-options */
604
496
case 'G': /* --global-env */
605
497
case 'o': /* --options-for */
611
503
case 129: /* --config-file */
612
504
free(argfile);
613
505
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
506
if(argfile == NULL){
507
perror("strdup");
616
508
}
617
break;
509
break;
618
510
case 130: /* --userid */
619
511
case 131: /* --groupid */
620
512
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
case '?': /* --help */
623
case -3: /* --usage */
624
case 'V': /* --version */
625
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
626
515
break;
627
516
default:
628
517
return ARGP_ERR_UNKNOWN;
629
518
}
630
return errno;
519
return 0;
631
520
}
632
521
633
522
struct argp argp = { .options = options,
635
524
.args_doc = "",
636
525
.doc = "Mandos plugin runner -- Run plugins" };
637
526
638
/* 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
639
528
config file location, if any. */
640
ret = argp_parse(&argp, argc, argv,
641
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
642
NULL, NULL);
643
switch(ret){
644
case 0:
645
break;
646
case ENOMEM:
647
default:
648
errno = ret;
649
error(0, errno, "argp_parse");
650
exitstatus = EX_OSERR;
651
goto fallback;
652
case EINVAL:
653
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;
654
533
goto fallback;
655
534
}
656
535
658
537
argp.parser = parse_opt;
659
538
660
539
/* Open the configfile if available */
661
if(argfile == NULL){
540
if (argfile == NULL){
662
541
conffp = fopen(AFILE, "r");
663
542
} else {
664
543
conffp = fopen(argfile, "r");
665
}
544
}
666
545
if(conffp != NULL){
667
546
char *org_line = NULL;
668
547
char *p, *arg, *new_arg, *line;
669
548
size_t size = 0;
549
ssize_t sret;
670
550
const char whitespace_delims[] = " \r\t\f\v\n";
671
551
const char comment_delim[] = "#";
672
552
673
553
custom_argc = 1;
674
554
custom_argv = malloc(sizeof(char*) * 2);
675
555
if(custom_argv == NULL){
676
error(0, errno, "malloc");
677
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
678
558
goto fallback;
679
559
}
680
560
custom_argv[0] = argv[0];
681
561
custom_argv[1] = NULL;
682
562
683
563
/* for each line in the config file, strip whitespace and ignore
684
564
commented text */
685
565
while(true){
687
567
if(sret == -1){
688
568
break;
689
569
}
690
570
691
571
line = org_line;
692
572
arg = strsep(&line, comment_delim);
693
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
696
576
}
697
577
new_arg = strdup(p);
698
578
if(new_arg == NULL){
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
701
581
free(org_line);
702
582
goto fallback;
703
583
}
704
584
705
585
custom_argc += 1;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
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;
718
593
}
719
594
custom_argv[custom_argc-1] = new_arg;
720
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
721
596
}
722
597
}
723
do {
724
ret = fclose(conffp);
725
} while(ret == EOF and errno == EINTR);
726
if(ret == EOF){
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
729
goto fallback;
730
}
731
598
free(org_line);
732
599
} else {
733
600
/* Check for harmful errors and go to fallback. Other errors might
734
601
not affect opening plugins */
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
738
605
goto fallback;
739
606
}
740
607
}
741
/* If there were any arguments from the configuration file, pass
742
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
743
610
if(custom_argv != NULL){
744
ret = argp_parse(&argp, custom_argc, custom_argv,
745
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
746
NULL, NULL);
747
switch(ret){
748
case 0:
749
break;
750
case ENOMEM:
751
default:
752
errno = ret;
753
error(0, errno, "argp_parse");
754
exitstatus = EX_OSERR;
755
goto fallback;
756
case EINVAL:
757
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;
758
616
goto fallback;
759
617
}
760
618
}
761
619
762
620
/* Parse actual command line arguments, to let them override the
763
621
config file */
764
ret = argp_parse(&argp, argc, argv,
765
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
766
NULL, NULL);
767
switch(ret){
768
case 0:
769
break;
770
case ENOMEM:
771
default:
772
errno = ret;
773
error(0, errno, "argp_parse");
774
exitstatus = EX_OSERR;
775
goto fallback;
776
case EINVAL:
777
exitstatus = EX_USAGE;
778
goto fallback;
779
}
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
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;
797
627
}
798
628
799
629
if(debug){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
801
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
802
632
p->name ? p->name : "Global", p->argc - 1);
803
633
for(char **a = p->argv; *a != NULL; a++){
804
634
fprintf(stderr, "\tArg: %s\n", *a);
805
635
}
806
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
807
637
for(char **a = p->environ; *a != NULL; a++){
808
638
fprintf(stderr, "\t%s\n", *a);
809
639
}
810
640
}
811
641
}
812
642
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
839
if(ret == -1){
840
error(0, errno, "setgid");
841
}
643
/* Strip permissions down to nobody */
842
644
ret = setuid(uid);
843
if(ret == -1){
844
error(0, errno, "setuid");
845
}
846
847
/* 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 */
848
666
{
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
856
if(dir_fd == -1){
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
859
goto fallback;
860
}
861
862
#ifndef O_CLOEXEC
863
/* Set the FD_CLOEXEC flag on the directory */
864
ret = set_cloexec_flag(dir_fd);
865
if(ret < 0){
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
868
goto fallback;
869
}
870
#endif /* O_CLOEXEC */
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
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;
893
674
}
894
675
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
905
676
}
906
677
907
678
FD_ZERO(&rfds_all);
908
679
909
680
/* Read and execute any executable in the plugin directory*/
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
916
continue;
917
}
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
919
if(ret == -1){
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
923
continue;
924
}
925
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
926
758
/* Ignore non-executable files */
927
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
930
760
if(debug){
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
935
763
}
936
close(plugin_fd);
937
free(direntries[i]);
764
free(filename);
938
765
continue;
939
766
}
940
767
941
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
942
769
if(p == NULL){
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
946
772
continue;
947
773
}
948
774
if(p->disabled){
949
775
if(debug){
950
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
951
direntries[i]->d_name);
777
dirst->d_name);
952
778
}
953
close(plugin_fd);
954
free(direntries[i]);
779
free(filename);
955
780
continue;
956
781
}
957
782
{
960
785
if(g != NULL){
961
786
for(char **a = g->argv + 1; *a != NULL; a++){
962
787
if(not add_argument(p, *a)){
963
error(0, errno, "add_argument");
788
perror("add_argument");
964
789
}
965
790
}
966
791
/* Add global environment variables */
967
792
for(char **e = g->environ; *e != NULL; e++){
968
793
if(not add_environment(p, *e, false)){
969
error(0, errno, "add_environment");
794
perror("add_environment");
970
795
}
971
796
}
972
797
}
973
798
}
974
/* If this plugin has any environment variables, we need to
975
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. */
976
802
if(p->environ[0] != NULL){
977
803
for(char **e = environ; *e != NULL; e++){
978
804
if(not add_environment(p, *e, false)){
979
error(0, errno, "add_environment");
805
perror("add_environment");
980
806
}
981
807
}
982
808
}
983
809
984
810
int pipefd[2];
985
#ifndef O_CLOEXEC
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
990
if(ret == -1){
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1006
817
/* Ask OS to automatic close the pipe on exec */
1007
818
ret = set_cloexec_flag(pipefd[0]);
1008
819
if(ret < 0){
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1014
822
goto fallback;
1015
823
}
1016
824
ret = set_cloexec_flag(pipefd[1]);
1017
825
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1023
828
goto fallback;
1024
829
}
1025
#endif /* not O_CLOEXEC */
1026
830
/* Block SIGCHLD until process is safely in process list */
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
&sigchld_action.sa_mask,
1029
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1030
832
if(ret < 0){
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1034
835
goto fallback;
1035
836
}
1036
837
/* Starting a new process to be watched */
1037
pid_t pid;
1038
do {
1039
pid = fork();
1040
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1041
839
if(pid == -1){
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1049
842
goto fallback;
1050
843
}
1051
844
if(pid == 0){
1052
845
/* this is the child process */
1053
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1054
847
if(ret < 0){
1055
error(0, errno, "sigaction");
1056
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1057
850
}
1058
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
852
if(ret < 0){
1060
error(0, errno, "sigprocmask");
1061
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1062
855
}
1063
856
1064
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
858
if(ret == -1){
1066
error(0, errno, "dup2");
1067
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1068
861
}
1069
862
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_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
}
1076
878
}
1077
879
/* no return */
1078
880
}
1079
881
/* Parent process */
1080
882
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1083
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1085
ret = (int)(TEMP_FAILURE_RETRY
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1087
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);
1088
888
if(ret < 0){
1089
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1090
890
}
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1093
892
goto fallback;
1094
893
}
1095
free(direntries[i]);
1096
894
1097
895
new_plugin->pid = pid;
1098
896
new_plugin->fd = pipefd[0];
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
897
1105
898
/* Unblock SIGCHLD so signal handler can be run if this process
1106
899
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
901
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1113
904
goto fallback;
1114
905
}
1115
906
1116
907
FD_SET(new_plugin->fd, &rfds_all);
1117
908
1118
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1119
910
maxfd = new_plugin->fd;
1120
911
}
1121
912
}
1122
913
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1127
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1128
916
1129
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1130
918
if(p->pid != 0){
1141
929
while(plugin_list){
1142
930
fd_set rfds = rfds_all;
1143
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1144
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1147
935
goto fallback;
1148
936
}
1149
937
/* OK, now either a process completed, or something can be read
1150
938
from one of them */
1151
939
for(plugin *proc = plugin_list; proc != NULL;){
1152
940
/* Is this process completely done? */
1153
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1154
942
/* Only accept the plugin output if it exited cleanly */
1155
943
if(not WIFEXITED(proc->status)
1156
944
or WEXITSTATUS(proc->status) != 0){
1157
945
/* Bad exit by plugin */
1158
946
1159
947
if(debug){
1160
948
if(WIFEXITED(proc->status)){
1161
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1162
" status %d\n", proc->name,
1163
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1164
951
WEXITSTATUS(proc->status));
1165
} else if(WIFSIGNALED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1167
" signal %d: %s\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WTERMSIG(proc->status),
1170
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));
1171
959
}
1172
960
}
1173
961
1174
962
/* Remove the plugin */
1175
963
FD_CLR(proc->fd, &rfds_all);
1176
964
1177
965
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
967
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1185
970
goto fallback;
1186
971
}
1187
972
1190
975
proc = next_plugin;
1191
976
1192
977
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1196
980
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1199
983
goto fallback;
1200
984
}
1201
985
1211
995
bool bret = print_out_password(proc->buffer,
1212
996
proc->buffer_length);
1213
997
if(not bret){
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1216
1000
}
1217
1001
goto fallback;
1218
1002
}
1225
1009
}
1226
1010
/* Before reading, make the process' data buffer large enough */
1227
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1232
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;
1233
1017
goto fallback;
1234
1018
}
1235
proc->buffer = new_buffer;
1236
1019
proc->buffer_size += BUFFER_SIZE;
1237
1020
}
1238
1021
/* Read from the process */
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1243
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1244
1025
/* Read error from this process; ignore the error */
1245
1026
proc = proc->next;
1246
1027
continue;
1247
1028
}
1248
if(sret == 0){
1029
if(ret == 0){
1249
1030
/* got EOF */
1250
1031
proc->eof = true;
1251
1032
} else {
1252
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1253
1034
}
1254
1035
}
1255
1036
}
1256
1257
1037
1038
1258
1039
fallback:
1259
1040
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1262
1042
/* Fallback if all plugins failed, none are found or an error
1263
1043
occured */
1264
1044
bool bret;
1272
1052
}
1273
1053
bret = print_out_password(passwordbuffer, len);
1274
1054
if(not bret){
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1277
1057
}
1278
1058
}
1279
1059
1280
1060
/* Restore old signal handler */
1281
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
1062
if(ret == -1){
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1285
1065
}
1286
1066
1287
1067
if(custom_argv != NULL){
1291
1071
free(custom_argv);
1292
1072
}
1293
1073
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1298
1076
}
1299
1077
1300
1078
/* Kill the processes */
1304
1082
ret = kill(p->pid, SIGTERM);
1305
1083
if(ret == -1 and errno != ESRCH){
1306
1084
/* Set-uid proccesses might not get closed */
1307
error(0, errno, "kill");
1085
perror("kill");
1308
1086
}
1309
1087
}
1310
1088
}
1311
1089
1312
1090
/* Wait for any remaining child processes to terminate */
1313
do {
1091
do{
1314
1092
ret = wait(NULL);
1315
1093
} while(ret >= 0);
1316
1094
if(errno != ECHILD){
1317
error(0, errno, "wait");
1095
perror("wait");
1318
1096
}
1319
1097
1320
1098
free_plugin_list();
1321
1099
1322
1100
free(plugindir);
1323
free(pluginhelperdir);
1324
1101
free(argfile);
1325
1102
1326
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0