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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(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
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
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
153
*array = realloc(*array, sizeof(char *)
154
* (size_t) ((*len) + 2));
196
155
/* Malloc check */
197
if(new_array == NULL){
156
if(*array == NULL){
198
157
return false;
199
158
}
200
*array = new_array;
201
159
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
160
char *copy = strdup(new);
206
161
if(copy == NULL){
207
162
return false;
208
163
}
215
170
}
216
171
217
172
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
173
static bool add_argument(plugin *p, const char *arg){
220
174
if(p == NULL){
221
175
return false;
224
178
}
225
179
226
180
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
181
static bool add_environment(plugin *p, const char *def, bool replace){
229
182
if(p == NULL){
230
183
return false;
232
185
/* namelen = length of name of environment variable */
233
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
187
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
237
190
/* It already exists */
238
191
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
192
char *new = realloc(*e, strlen(def) + 1);
193
if(new == NULL){
244
194
return false;
245
195
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
196
*e = new;
197
strcpy(*e, def);
248
198
}
249
199
return true;
250
200
}
252
202
return add_to_char_array(def, &(p->environ), &(p->envc));
253
203
}
254
204
255
#ifndef O_CLOEXEC
256
205
/*
257
206
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
207
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
209
*/
261
__attribute__((warn_unused_result))
262
210
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
211
int ret = fcntl(fd, F_GETFD, 0);
264
212
/* If reading the flags failed, return error indication now. */
265
213
if(ret < 0){
266
214
return ret;
267
215
}
268
216
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
217
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
218
}
272
#endif /* not O_CLOEXEC */
273
219
274
220
275
221
/* Mark processes as completed when they exit, and save their exit
276
222
status. */
277
223
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
279
224
while(true){
280
225
plugin *proc = plugin_list;
281
226
int status;
285
230
break;
286
231
}
287
232
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
233
if (errno != ECHILD){
234
perror("waitpid");
291
235
}
292
error(0, errno, "waitpid");
236
/* No child processes */
237
break;
293
238
}
294
239
295
240
/* A child exited, find it in process_list */
301
246
continue;
302
247
}
303
248
proc->status = status;
304
proc->completed = 1;
249
proc->completed = true;
305
250
}
306
errno = old_errno;
307
251
}
308
252
309
253
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
254
static bool print_out_password(const char *buffer, size_t length){
312
255
ssize_t ret;
313
256
for(size_t written = 0; written < length; written += (size_t)ret){
321
264
}
322
265
323
266
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
267
static void free_plugin(plugin *plugin_node){
326
268
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
269
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
328
270
free(*arg);
329
271
}
330
free(plugin_node->name);
331
272
free(plugin_node->argv);
332
273
for(char **env = plugin_node->environ; *env != NULL; env++){
333
274
free(*env);
334
275
}
335
276
free(plugin_node->environ);
336
277
free(plugin_node->buffer);
337
278
338
279
/* Removes the plugin from the singly-linked list */
339
280
if(plugin_node == plugin_list){
340
281
/* First one - simple */
360
301
361
302
int main(int argc, char *argv[]){
362
303
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
304
char *argfile = NULL;
365
305
FILE *conffp;
366
struct dirent **direntries = NULL;
306
size_t d_name_len;
307
DIR *dir = NULL;
308
struct dirent *dirst;
367
309
struct stat st;
368
310
fd_set rfds_all;
369
311
int ret, maxfd = 0;
370
ssize_t sret;
371
312
uid_t uid = 65534;
372
313
gid_t gid = 65534;
373
314
bool debug = false;
377
318
.sa_flags = SA_NOCLDSTOP };
378
319
char **custom_argv = NULL;
379
320
int custom_argc = 0;
380
int dir_fd = -1;
381
321
382
322
/* Establish a signal handler */
383
323
sigemptyset(&sigchld_action.sa_mask);
384
324
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
325
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
326
perror("sigaddset");
327
exitstatus = EXIT_FAILURE;
388
328
goto fallback;
389
329
}
390
330
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
331
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
332
perror("sigaction");
333
exitstatus = EXIT_FAILURE;
394
334
goto fallback;
395
335
}
396
336
428
368
.doc = "Group ID the plugins will run as", .group = 3 },
429
369
{ .name = "debug", .key = 132,
430
370
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
444
371
{ .name = NULL }
445
372
};
446
373
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
374
error_t parse_opt (int key, char *arg, __attribute__((unused))
375
struct argp_state *state) {
376
switch (key) {
453
377
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
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;
459
387
}
460
388
}
461
errno = 0;
462
389
}
463
390
break;
464
391
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
392
if(arg == NULL){
393
break;
394
}
395
if(not add_environment(getplugin(NULL), arg, true)){
396
perror("add_environment");
467
397
}
468
398
break;
469
399
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
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
}
491
419
}
492
420
break;
493
421
case 'E': /* --env-for */
422
if(arg == NULL){
423
break;
424
}
494
425
{
495
426
char *envdef = strchr(arg, ':');
496
427
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
428
break;
500
429
}
501
430
*envdef = '\0';
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
431
if(not add_environment(getplugin(arg), envdef+1, true)){
432
perror("add_environment");
510
433
}
511
434
}
512
435
break;
513
436
case 'd': /* --disable */
514
{
437
if (arg != NULL){
515
438
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
439
if(p == NULL){
440
return ARGP_ERR_UNKNOWN;
519
441
}
442
p->disabled = true;
520
443
}
521
444
break;
522
445
case 'e': /* --enable */
523
{
446
if (arg != NULL){
524
447
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
448
if(p == NULL){
449
return ARGP_ERR_UNKNOWN;
528
450
}
451
p->disabled = false;
529
452
}
530
453
break;
531
454
case 128: /* --plugin-dir */
532
455
free(plugindir);
533
456
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
457
if(plugindir == NULL){
458
perror("strdup");
459
}
537
460
break;
538
461
case 129: /* --config-file */
539
462
/* This is already done by parse_opt_config_file() */
540
463
break;
541
464
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
465
uid = (uid_t)strtol(arg, NULL, 10);
551
466
break;
552
467
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
468
gid = (gid_t)strtol(arg, NULL, 10);
562
469
break;
563
470
case 132: /* --debug */
564
471
debug = true;
565
472
break;
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
473
case ARGP_KEY_ARG:
594
474
/* Cryptsetup always passes an argument, which is an empty
595
475
string if "none" was specified in /etc/crypttab. So if
596
476
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
477
if(arg[0] != '\0'){
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
599
479
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
480
break;
481
case ARGP_KEY_END:
482
break;
605
483
default:
606
484
return ARGP_ERR_UNKNOWN;
607
485
}
608
return errno; /* Set to 0 at start */
486
return 0;
609
487
}
610
488
611
489
/* This option parser is the same as parse_opt() above, except it
612
490
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
618
495
case 'g': /* --global-options */
619
496
case 'G': /* --global-env */
620
497
case 'o': /* --options-for */
626
503
case 129: /* --config-file */
627
504
free(argfile);
628
505
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
506
if(argfile == NULL){
507
perror("strdup");
631
508
}
632
break;
509
break;
633
510
case 130: /* --userid */
634
511
case 131: /* --groupid */
635
512
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
641
515
break;
642
516
default:
643
517
return ARGP_ERR_UNKNOWN;
644
518
}
645
return errno;
519
return 0;
646
520
}
647
521
648
522
struct argp argp = { .options = options,
650
524
.args_doc = "",
651
525
.doc = "Mandos plugin runner -- Run plugins" };
652
526
653
/* 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
654
528
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
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;
669
533
goto fallback;
670
534
}
671
535
673
537
argp.parser = parse_opt;
674
538
675
539
/* Open the configfile if available */
676
if(argfile == NULL){
540
if (argfile == NULL){
677
541
conffp = fopen(AFILE, "r");
678
542
} else {
679
543
conffp = fopen(argfile, "r");
680
}
544
}
681
545
if(conffp != NULL){
682
546
char *org_line = NULL;
683
547
char *p, *arg, *new_arg, *line;
684
548
size_t size = 0;
549
ssize_t sret;
685
550
const char whitespace_delims[] = " \r\t\f\v\n";
686
551
const char comment_delim[] = "#";
687
552
688
553
custom_argc = 1;
689
554
custom_argv = malloc(sizeof(char*) * 2);
690
555
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
693
558
goto fallback;
694
559
}
695
560
custom_argv[0] = argv[0];
696
561
custom_argv[1] = NULL;
697
562
698
563
/* for each line in the config file, strip whitespace and ignore
699
564
commented text */
700
565
while(true){
702
567
if(sret == -1){
703
568
break;
704
569
}
705
570
706
571
line = org_line;
707
572
arg = strsep(&line, comment_delim);
708
573
while((p = strsep(&arg, whitespace_delims)) != NULL){
711
576
}
712
577
new_arg = strdup(p);
713
578
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
716
581
free(org_line);
717
582
goto fallback;
718
583
}
719
584
720
585
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
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;
744
593
}
745
594
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
595
custom_argv[custom_argc] = NULL;
747
596
}
748
597
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
598
free(org_line);
758
599
} else {
759
600
/* Check for harmful errors and go to fallback. Other errors might
760
601
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
602
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
perror("fopen");
604
exitstatus = EXIT_FAILURE;
764
605
goto fallback;
765
606
}
766
607
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
769
610
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
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;
784
616
goto fallback;
785
617
}
786
618
}
787
619
788
620
/* Parse actual command line arguments, to let them override the
789
621
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
822
}
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;
823
627
}
824
628
825
629
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
632
p->name ? p->name : "Global", p->argc - 1);
829
633
for(char **a = p->argv; *a != NULL; a++){
830
634
fprintf(stderr, "\tArg: %s\n", *a);
831
635
}
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
833
637
for(char **a = p->environ; *a != NULL; a++){
834
638
fprintf(stderr, "\t%s\n", *a);
835
639
}
836
640
}
837
641
}
838
642
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
643
/* Strip permissions down to nobody */
868
644
ret = setuid(uid);
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* 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 */
874
666
{
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
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;
919
674
}
920
675
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
931
676
}
932
677
933
678
FD_ZERO(&rfds_all);
934
679
935
680
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
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
952
758
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
759
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
956
760
if(debug){
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
761
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
762
" with bad type or mode\n", filename);
961
763
}
962
close(plugin_fd);
963
free(direntries[i]);
764
free(filename);
964
765
continue;
965
766
}
966
767
967
plugin *p = getplugin(direntries[i]->d_name);
768
plugin *p = getplugin(dirst->d_name);
968
769
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
770
perror("getplugin");
771
free(filename);
972
772
continue;
973
773
}
974
774
if(p->disabled){
975
775
if(debug){
976
776
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
777
dirst->d_name);
978
778
}
979
close(plugin_fd);
980
free(direntries[i]);
779
free(filename);
981
780
continue;
982
781
}
983
782
{
986
785
if(g != NULL){
987
786
for(char **a = g->argv + 1; *a != NULL; a++){
988
787
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
788
perror("add_argument");
990
789
}
991
790
}
992
791
/* Add global environment variables */
993
792
for(char **e = g->environ; *e != NULL; e++){
994
793
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
794
perror("add_environment");
996
795
}
997
796
}
998
797
}
999
798
}
1000
/* If this plugin has any environment variables, we need to
1001
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. */
1002
802
if(p->environ[0] != NULL){
1003
803
for(char **e = environ; *e != NULL; e++){
1004
804
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
805
perror("add_environment");
1006
806
}
1007
807
}
1008
808
}
1009
809
1010
810
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
811
ret = pipe(pipefd);
812
if (ret == -1){
813
perror("pipe");
814
exitstatus = EXIT_FAILURE;
815
goto fallback;
816
}
1032
817
/* Ask OS to automatic close the pipe on exec */
1033
818
ret = set_cloexec_flag(pipefd[0]);
1034
819
if(ret < 0){
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
820
perror("set_cloexec_flag");
821
exitstatus = EXIT_FAILURE;
1040
822
goto fallback;
1041
823
}
1042
824
ret = set_cloexec_flag(pipefd[1]);
1043
825
if(ret < 0){
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
826
perror("set_cloexec_flag");
827
exitstatus = EXIT_FAILURE;
1049
828
goto fallback;
1050
829
}
1051
#endif /* not O_CLOEXEC */
1052
830
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
831
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1056
832
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
833
perror("sigprocmask");
834
exitstatus = EXIT_FAILURE;
1060
835
goto fallback;
1061
836
}
1062
837
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
838
pid_t pid = fork();
1067
839
if(pid == -1){
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
840
perror("fork");
841
exitstatus = EXIT_FAILURE;
1075
842
goto fallback;
1076
843
}
1077
844
if(pid == 0){
1078
845
/* this is the child process */
1079
846
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
847
if(ret < 0){
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
848
perror("sigaction");
849
_exit(EXIT_FAILURE);
1083
850
}
1084
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
852
if(ret < 0){
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
853
perror("sigprocmask");
854
_exit(EXIT_FAILURE);
1088
855
}
1089
856
1090
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
858
if(ret == -1){
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
859
perror("dup2");
860
_exit(EXIT_FAILURE);
1094
861
}
1095
862
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
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
}
1102
878
}
1103
879
/* no return */
1104
880
}
1105
881
/* Parent process */
1106
882
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
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);
1114
888
if(ret < 0){
1115
error(0, errno, "sigprocmask");
889
perror("sigprocmask");
1116
890
}
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
891
exitstatus = EXIT_FAILURE;
1119
892
goto fallback;
1120
893
}
1121
free(direntries[i]);
1122
894
1123
895
new_plugin->pid = pid;
1124
896
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
897
1131
898
/* Unblock SIGCHLD so signal handler can be run if this process
1132
899
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
900
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1136
901
if(ret < 0){
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
902
perror("sigprocmask");
903
exitstatus = EXIT_FAILURE;
1139
904
goto fallback;
1140
905
}
1141
906
1142
907
FD_SET(new_plugin->fd, &rfds_all);
1143
908
1144
if(maxfd < new_plugin->fd){
909
if (maxfd < new_plugin->fd){
1145
910
maxfd = new_plugin->fd;
1146
911
}
1147
912
}
1148
913
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
914
closedir(dir);
915
dir = NULL;
1154
916
1155
917
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
918
if(p->pid != 0){
1167
929
while(plugin_list){
1168
930
fd_set rfds = rfds_all;
1169
931
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
932
if (select_ret == -1){
933
perror("select");
934
exitstatus = EXIT_FAILURE;
1173
935
goto fallback;
1174
936
}
1175
937
/* OK, now either a process completed, or something can be read
1176
938
from one of them */
1177
939
for(plugin *proc = plugin_list; proc != NULL;){
1178
940
/* Is this process completely done? */
1179
if(proc->completed and proc->eof){
941
if(proc->eof and proc->completed){
1180
942
/* Only accept the plugin output if it exited cleanly */
1181
943
if(not WIFEXITED(proc->status)
1182
944
or WEXITSTATUS(proc->status) != 0){
1183
945
/* Bad exit by plugin */
1184
946
1185
947
if(debug){
1186
948
if(WIFEXITED(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
949
fprintf(stderr, "Plugin %u exited with status %d\n",
950
(unsigned int) (proc->pid),
1190
951
WEXITSTATUS(proc->status));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
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));
1197
959
}
1198
960
}
1199
961
1200
962
/* Remove the plugin */
1201
963
FD_CLR(proc->fd, &rfds_all);
1202
964
1203
965
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
966
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1208
967
if(ret < 0){
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
968
perror("sigprocmask");
969
exitstatus = EXIT_FAILURE;
1211
970
goto fallback;
1212
971
}
1213
972
1216
975
proc = next_plugin;
1217
976
1218
977
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
979
NULL);
1222
980
if(ret < 0){
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
981
perror("sigprocmask");
982
exitstatus = EXIT_FAILURE;
1225
983
goto fallback;
1226
984
}
1227
985
1237
995
bool bret = print_out_password(proc->buffer,
1238
996
proc->buffer_length);
1239
997
if(not bret){
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
998
perror("print_out_password");
999
exitstatus = EXIT_FAILURE;
1242
1000
}
1243
1001
goto fallback;
1244
1002
}
1251
1009
}
1252
1010
/* Before reading, make the process' data buffer large enough */
1253
1011
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
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;
1259
1017
goto fallback;
1260
1018
}
1261
proc->buffer = new_buffer;
1262
1019
proc->buffer_size += BUFFER_SIZE;
1263
1020
}
1264
1021
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
1022
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1023
BUFFER_SIZE);
1024
if(ret < 0){
1270
1025
/* Read error from this process; ignore the error */
1271
1026
proc = proc->next;
1272
1027
continue;
1273
1028
}
1274
if(sret == 0){
1029
if(ret == 0){
1275
1030
/* got EOF */
1276
1031
proc->eof = true;
1277
1032
} else {
1278
proc->buffer_length += (size_t) sret;
1033
proc->buffer_length += (size_t) ret;
1279
1034
}
1280
1035
}
1281
1036
}
1282
1283
1037
1038
1284
1039
fallback:
1285
1040
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1041
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1288
1042
/* Fallback if all plugins failed, none are found or an error
1289
1043
occured */
1290
1044
bool bret;
1298
1052
}
1299
1053
bret = print_out_password(passwordbuffer, len);
1300
1054
if(not bret){
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
1055
perror("print_out_password");
1056
exitstatus = EXIT_FAILURE;
1303
1057
}
1304
1058
}
1305
1059
1306
1060
/* Restore old signal handler */
1307
1061
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
1062
if(ret == -1){
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1063
perror("sigaction");
1064
exitstatus = EXIT_FAILURE;
1311
1065
}
1312
1066
1313
1067
if(custom_argv != NULL){
1317
1071
free(custom_argv);
1318
1072
}
1319
1073
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1074
if(dir != NULL){
1075
closedir(dir);
1324
1076
}
1325
1077
1326
1078
/* Kill the processes */
1330
1082
ret = kill(p->pid, SIGTERM);
1331
1083
if(ret == -1 and errno != ESRCH){
1332
1084
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1085
perror("kill");
1334
1086
}
1335
1087
}
1336
1088
}
1337
1089
1338
1090
/* Wait for any remaining child processes to terminate */
1339
do {
1091
do{
1340
1092
ret = wait(NULL);
1341
1093
} while(ret >= 0);
1342
1094
if(errno != ECHILD){
1343
error(0, errno, "wait");
1095
perror("wait");
1344
1096
}
1345
1097
1346
1098
free_plugin_list();
1347
1099
1348
1100
free(plugindir);
1349
free(pluginhelperdir);
1350
1101
free(argfile);
1351
1102
1352
1103
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0