To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 250
- compare with another revision
- download diff
- download tarball
- view history from revision 250
- Committer: Teddy Hogeborn
- Date: 2009-01-06 05:08:37 UTC
- Revision ID: teddy@fukt.bsnet.se-20090106050837-111vhmg0s4kv424d
* debian/mandos-client.config: Removed.
* debian/mandos-client.postinst: Do not source
"/usr/share/debconf/confmodule".
* debian/mandos.config: Removed.
* debian/mandos.postinst: Do not source
"/usr/share/debconf/confmodule".
* debian/mandos-client.postinst: Do not source
"/usr/share/debconf/confmodule".
* debian/mandos.config: Removed.
* debian/mandos.postinst: Do not source
"/usr/share/debconf/confmodule".
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-ctl => mandos-list
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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