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 298
- compare with another revision
- download diff
- download tarball
- view history from revision 298
- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:26:27 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205032627-fbvgm97q5gtrbg10
* plugin-runner.c (handle_sigchld): Bug fix: Save and restore "errno".
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
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() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG() */
41
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS() */
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* struct dirent, scandirat() */
44
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
45
FD_CLOEXEC, write(), STDOUT_FILENO,
46
struct stat, fstat(), close(),
47
setgid(), setuid(), S_ISREG(),
48
faccessat() pipe2(), fork(),
49
_exit(), dup2(), fexecve(), read()
50
*/
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() */
51
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
52
FD_CLOEXEC, openat(), scandirat(),
53
pipe2() */
54
#include <string.h> /* strsep, strlen(), strsignal(),
55
strcmp(), strncmp() */
54
FD_CLOEXEC */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
62
62
#include <signal.h> /* struct sigaction, sigemptyset(),
63
63
sigaddset(), sigaction(),
64
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
65
SIG_UNBLOCK, kill() */
67
66
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
70
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
71
#include <errno.h> /* errno */
72
#include <error.h> /* error() */
73
#include <fnmatch.h> /* fnmatch() */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
74
68
75
69
#define BUFFER_SIZE 256
76
70
77
71
#define PDIR "/lib/mandos/plugins.d"
78
#define PHDIR "/lib/mandos/plugin-helpers"
79
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
73
81
74
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
76
84
77
typedef struct plugin{
85
78
char *name; /* can be NULL or any plugin name */
88
81
char **environ;
89
82
int envc;
90
83
bool disabled;
91
84
92
85
/* Variables used for running processes*/
93
86
pid_t pid;
94
87
int fd;
105
98
106
99
/* Gets an existing plugin based on name,
107
100
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
101
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
102
/* Check for exiting plugin with that name */
111
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
104
if((p->name == name)
113
105
or (p->name and name and (strcmp(p->name, name) == 0))){
115
107
}
116
108
}
117
109
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
110
plugin *new_plugin = malloc(sizeof(plugin));
122
111
if(new_plugin == NULL){
123
112
return NULL;
124
113
}
125
114
char *copy_name = NULL;
126
115
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
116
copy_name = strdup(name);
130
117
if(copy_name == NULL){
131
int e = errno;
132
118
free(new_plugin);
133
errno = e;
134
119
return NULL;
135
120
}
136
121
}
140
125
.disabled = false,
141
126
.next = plugin_list };
142
127
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
128
new_plugin->argv = malloc(sizeof(char *) * 2);
146
129
if(new_plugin->argv == NULL){
147
int e = errno;
148
130
free(copy_name);
149
131
free(new_plugin);
150
errno = e;
151
132
return NULL;
152
133
}
153
134
new_plugin->argv[0] = copy_name;
154
135
new_plugin->argv[1] = NULL;
155
136
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
137
new_plugin->environ = malloc(sizeof(char *));
159
138
if(new_plugin->environ == NULL){
160
int e = errno;
161
139
free(copy_name);
162
140
free(new_plugin->argv);
163
141
free(new_plugin);
164
errno = e;
165
142
return NULL;
166
143
}
167
144
new_plugin->environ[0] = NULL;
172
149
}
173
150
174
151
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
152
static bool add_to_char_array(const char *new, char ***array,
177
153
int *len){
178
154
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
184
157
/* Malloc check */
185
if(new_array == NULL){
158
if(*array == NULL){
186
159
return false;
187
160
}
188
*array = new_array;
189
161
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
162
char *copy = strdup(new);
194
163
if(copy == NULL){
195
164
return false;
196
165
}
203
172
}
204
173
205
174
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
175
static bool add_argument(plugin *p, const char *arg){
208
176
if(p == NULL){
209
177
return false;
212
180
}
213
181
214
182
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
183
static bool add_environment(plugin *p, const char *def, bool replace){
217
184
if(p == NULL){
218
185
return false;
220
187
/* namelen = length of name of environment variable */
221
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
189
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
225
192
/* It already exists */
226
193
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
232
196
return false;
233
197
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
198
*e = new;
199
strcpy(*e, def);
236
200
}
237
201
return true;
238
202
}
240
204
return add_to_char_array(def, &(p->environ), &(p->envc));
241
205
}
242
206
243
#ifndef O_CLOEXEC
244
207
/*
245
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
246
209
* Descriptor Flags".
247
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
211
*/
249
__attribute__((warn_unused_result))
250
212
static int set_cloexec_flag(int fd){
251
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
213
int ret = fcntl(fd, F_GETFD, 0);
252
214
/* If reading the flags failed, return error indication now. */
253
215
if(ret < 0){
254
216
return ret;
255
217
}
256
218
/* Store modified flag word in the descriptor. */
257
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
258
ret | FD_CLOEXEC));
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
259
220
}
260
#endif /* not O_CLOEXEC */
261
221
262
222
263
223
/* Mark processes as completed when they exit, and save their exit
277
237
/* No child processes */
278
238
break;
279
239
}
280
error(0, errno, "waitpid");
240
perror("waitpid");
281
241
}
282
242
283
243
/* A child exited, find it in process_list */
295
255
}
296
256
297
257
/* Prints out a password to stdout */
298
__attribute__((nonnull, warn_unused_result))
299
258
static bool print_out_password(const char *buffer, size_t length){
300
259
ssize_t ret;
301
260
for(size_t written = 0; written < length; written += (size_t)ret){
309
268
}
310
269
311
270
/* Removes and free a plugin from the plugin list */
312
__attribute__((nonnull))
313
271
static void free_plugin(plugin *plugin_node){
314
272
315
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
321
279
}
322
280
free(plugin_node->environ);
323
281
free(plugin_node->buffer);
324
282
325
283
/* Removes the plugin from the singly-linked list */
326
284
if(plugin_node == plugin_list){
327
285
/* First one - simple */
347
305
348
306
int main(int argc, char *argv[]){
349
307
char *plugindir = NULL;
350
char *pluginhelperdir = NULL;
351
308
char *argfile = NULL;
352
309
FILE *conffp;
353
struct dirent **direntries = NULL;
310
size_t d_name_len;
311
DIR *dir = NULL;
312
struct dirent *dirst;
354
313
struct stat st;
355
314
fd_set rfds_all;
356
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
357
316
ssize_t sret;
317
intmax_t tmpmax;
358
318
uid_t uid = 65534;
359
319
gid_t gid = 65534;
360
320
bool debug = false;
364
324
.sa_flags = SA_NOCLDSTOP };
365
325
char **custom_argv = NULL;
366
326
int custom_argc = 0;
367
int dir_fd = -1;
368
327
369
328
/* Establish a signal handler */
370
329
sigemptyset(&sigchld_action.sa_mask);
371
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
372
331
if(ret == -1){
373
error(0, errno, "sigaddset");
374
exitstatus = EX_OSERR;
332
perror("sigaddset");
333
exitstatus = EXIT_FAILURE;
375
334
goto fallback;
376
335
}
377
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
378
337
if(ret == -1){
379
error(0, errno, "sigaction");
380
exitstatus = EX_OSERR;
338
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
381
340
goto fallback;
382
341
}
383
342
415
374
.doc = "Group ID the plugins will run as", .group = 3 },
416
375
{ .name = "debug", .key = 132,
417
376
.doc = "Debug mode", .group = 4 },
418
{ .name = "plugin-helper-dir", .key = 133,
419
.arg = "DIRECTORY",
420
.doc = "Specify a different plugin helper directory",
421
.group = 2 },
422
/*
423
* These reproduce what we would get without ARGP_NO_HELP
424
*/
425
{ .name = "help", .key = '?',
426
.doc = "Give this help list", .group = -1 },
427
{ .name = "usage", .key = -3,
428
.doc = "Give a short usage message", .group = -1 },
429
{ .name = "version", .key = 'V',
430
.doc = "Print program version", .group = -1 },
431
377
{ .name = NULL }
432
378
};
433
379
434
__attribute__((nonnull(3)))
435
error_t parse_opt(int key, char *arg, struct argp_state *state){
436
errno = 0;
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
437
382
switch(key){
438
char *tmp;
439
intmax_t tmp_id;
440
383
case 'g': /* --global-options */
441
{
442
char *plugin_option;
443
while((plugin_option = strsep(&arg, ",")) != NULL){
444
if(not add_argument(getplugin(NULL), plugin_option)){
445
break;
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
446
393
}
447
394
}
448
errno = 0;
449
395
}
450
396
break;
451
397
case 'G': /* --global-env */
452
if(add_environment(getplugin(NULL), arg, true)){
453
errno = 0;
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
454
403
}
455
404
break;
456
405
case 'o': /* --options-for */
457
{
458
char *option_list = strchr(arg, ':');
459
if(option_list == NULL){
460
argp_error(state, "No colon in \"%s\"", arg);
461
errno = EINVAL;
462
break;
463
}
464
*option_list = '\0';
465
option_list++;
466
if(arg[0] == '\0'){
467
argp_error(state, "Empty plugin name");
468
errno = EINVAL;
469
break;
470
}
471
char *option;
472
while((option = strsep(&option_list, ",")) != NULL){
473
if(not add_argument(getplugin(arg), option)){
474
break;
475
}
476
}
477
errno = 0;
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
478
425
}
479
426
break;
480
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
481
431
{
482
432
char *envdef = strchr(arg, ':');
483
433
if(envdef == NULL){
484
argp_error(state, "No colon in \"%s\"", arg);
485
errno = EINVAL;
486
434
break;
487
435
}
488
436
*envdef = '\0';
489
envdef++;
490
if(arg[0] == '\0'){
491
argp_error(state, "Empty plugin name");
492
errno = EINVAL;
493
break;
494
}
495
if(add_environment(getplugin(arg), envdef, true)){
496
errno = 0;
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
497
439
}
498
440
}
499
441
break;
500
442
case 'd': /* --disable */
501
{
443
if(arg != NULL){
502
444
plugin *p = getplugin(arg);
503
if(p != NULL){
504
p->disabled = true;
505
errno = 0;
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
506
447
}
448
p->disabled = true;
507
449
}
508
450
break;
509
451
case 'e': /* --enable */
510
{
452
if(arg != NULL){
511
453
plugin *p = getplugin(arg);
512
if(p != NULL){
513
p->disabled = false;
514
errno = 0;
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
515
456
}
457
p->disabled = false;
516
458
}
517
459
break;
518
460
case 128: /* --plugin-dir */
519
461
free(plugindir);
520
462
plugindir = strdup(arg);
521
if(plugindir != NULL){
522
errno = 0;
523
}
463
if(plugindir == NULL){
464
perror("strdup");
465
}
524
466
break;
525
467
case 129: /* --config-file */
526
468
/* This is already done by parse_opt_config_file() */
527
469
break;
528
470
case 130: /* --userid */
529
tmp_id = strtoimax(arg, &tmp, 10);
530
if(errno != 0 or tmp == arg or *tmp != '\0'
531
or tmp_id != (uid_t)tmp_id){
532
argp_error(state, "Bad user ID number: \"%s\", using %"
533
PRIdMAX, arg, (intmax_t)uid);
534
break;
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
535
478
}
536
uid = (uid_t)tmp_id;
537
errno = 0;
538
479
break;
539
480
case 131: /* --groupid */
540
tmp_id = strtoimax(arg, &tmp, 10);
541
if(errno != 0 or tmp == arg or *tmp != '\0'
542
or tmp_id != (gid_t)tmp_id){
543
argp_error(state, "Bad group ID number: \"%s\", using %"
544
PRIdMAX, arg, (intmax_t)gid);
545
break;
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
546
488
}
547
gid = (gid_t)tmp_id;
548
errno = 0;
549
489
break;
550
490
case 132: /* --debug */
551
491
debug = true;
552
492
break;
553
case 133: /* --plugin-helper-dir */
554
free(pluginhelperdir);
555
pluginhelperdir = strdup(arg);
556
if(pluginhelperdir != NULL){
557
errno = 0;
558
}
559
break;
560
/*
561
* These reproduce what we would get without ARGP_NO_HELP
562
*/
563
case '?': /* --help */
564
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
565
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
566
case -3: /* --usage */
567
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
568
argp_state_help(state, state->out_stream,
569
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
570
case 'V': /* --version */
571
fprintf(state->out_stream, "%s\n", argp_program_version);
572
exit(EXIT_SUCCESS);
573
break;
574
493
/*
575
494
* When adding more options before this line, remember to also add a
576
495
* "case" to the "parse_opt_config_file" function below.
579
498
/* Cryptsetup always passes an argument, which is an empty
580
499
string if "none" was specified in /etc/crypttab. So if
581
500
argument was empty, we ignore it silently. */
582
if(arg[0] == '\0'){
583
break;
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
584
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
585
507
default:
586
508
return ARGP_ERR_UNKNOWN;
587
509
}
588
return errno; /* Set to 0 at start */
510
return 0;
589
511
}
590
512
591
513
/* This option parser is the same as parse_opt() above, except it
593
515
error_t parse_opt_config_file(int key, char *arg,
594
516
__attribute__((unused))
595
517
struct argp_state *state){
596
errno = 0;
597
518
switch(key){
598
519
case 'g': /* --global-options */
599
520
case 'G': /* --global-env */
606
527
case 129: /* --config-file */
607
528
free(argfile);
608
529
argfile = strdup(arg);
609
if(argfile != NULL){
610
errno = 0;
530
if(argfile == NULL){
531
perror("strdup");
611
532
}
612
break;
533
break;
613
534
case 130: /* --userid */
614
535
case 131: /* --groupid */
615
536
case 132: /* --debug */
616
case 133: /* --plugin-helper-dir */
617
case '?': /* --help */
618
case -3: /* --usage */
619
case 'V': /* --version */
620
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
621
539
break;
622
540
default:
623
541
return ARGP_ERR_UNKNOWN;
624
542
}
625
return errno;
543
return 0;
626
544
}
627
545
628
546
struct argp argp = { .options = options,
632
550
633
551
/* Parse using parse_opt_config_file() in order to get the custom
634
552
config file location, if any. */
635
ret = argp_parse(&argp, argc, argv,
636
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
637
NULL, NULL);
638
switch(ret){
639
case 0:
640
break;
641
case ENOMEM:
642
default:
643
errno = ret;
644
error(0, errno, "argp_parse");
645
exitstatus = EX_OSERR;
646
goto fallback;
647
case EINVAL:
648
exitstatus = EX_USAGE;
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
555
fprintf(stderr, "Unknown error while parsing arguments\n");
556
exitstatus = EXIT_FAILURE;
649
557
goto fallback;
650
558
}
651
559
657
565
conffp = fopen(AFILE, "r");
658
566
} else {
659
567
conffp = fopen(argfile, "r");
660
}
568
}
661
569
if(conffp != NULL){
662
570
char *org_line = NULL;
663
571
char *p, *arg, *new_arg, *line;
664
572
size_t size = 0;
665
573
const char whitespace_delims[] = " \r\t\f\v\n";
666
574
const char comment_delim[] = "#";
667
575
668
576
custom_argc = 1;
669
577
custom_argv = malloc(sizeof(char*) * 2);
670
578
if(custom_argv == NULL){
671
error(0, errno, "malloc");
672
exitstatus = EX_OSERR;
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
673
581
goto fallback;
674
582
}
675
583
custom_argv[0] = argv[0];
676
584
custom_argv[1] = NULL;
677
585
678
586
/* for each line in the config file, strip whitespace and ignore
679
587
commented text */
680
588
while(true){
682
590
if(sret == -1){
683
591
break;
684
592
}
685
593
686
594
line = org_line;
687
595
arg = strsep(&line, comment_delim);
688
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
599
}
692
600
new_arg = strdup(p);
693
601
if(new_arg == NULL){
694
error(0, errno, "strdup");
695
exitstatus = EX_OSERR;
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
696
604
free(org_line);
697
605
goto fallback;
698
606
}
699
607
700
608
custom_argc += 1;
701
{
702
char **new_argv = realloc(custom_argv, sizeof(char *)
703
* ((size_t)custom_argc + 1));
704
if(new_argv == NULL){
705
error(0, errno, "realloc");
706
exitstatus = EX_OSERR;
707
free(new_arg);
708
free(org_line);
709
goto fallback;
710
} else {
711
custom_argv = new_argv;
712
}
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
713
616
}
714
617
custom_argv[custom_argc-1] = new_arg;
715
custom_argv[custom_argc] = NULL;
618
custom_argv[custom_argc] = NULL;
716
619
}
717
620
}
718
do {
719
ret = fclose(conffp);
720
} while(ret == EOF and errno == EINTR);
721
if(ret == EOF){
722
error(0, errno, "fclose");
723
exitstatus = EX_IOERR;
724
goto fallback;
725
}
726
621
free(org_line);
727
622
} else {
728
623
/* Check for harmful errors and go to fallback. Other errors might
729
624
not affect opening plugins */
730
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
731
error(0, errno, "fopen");
732
exitstatus = EX_OSERR;
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
733
628
goto fallback;
734
629
}
735
630
}
736
/* If there were any arguments from the configuration file, pass
737
them to parser as command line arguments */
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
738
633
if(custom_argv != NULL){
739
ret = argp_parse(&argp, custom_argc, custom_argv,
740
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
741
NULL, NULL);
742
switch(ret){
743
case 0:
744
break;
745
case ENOMEM:
746
default:
747
errno = ret;
748
error(0, errno, "argp_parse");
749
exitstatus = EX_OSERR;
750
goto fallback;
751
case EINVAL:
752
exitstatus = EX_CONFIG;
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
637
fprintf(stderr, "Unknown error while parsing arguments\n");
638
exitstatus = EXIT_FAILURE;
753
639
goto fallback;
754
640
}
755
641
}
756
642
757
643
/* Parse actual command line arguments, to let them override the
758
644
config file */
759
ret = argp_parse(&argp, argc, argv,
760
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
761
NULL, NULL);
762
switch(ret){
763
case 0:
764
break;
765
case ENOMEM:
766
default:
767
errno = ret;
768
error(0, errno, "argp_parse");
769
exitstatus = EX_OSERR;
770
goto fallback;
771
case EINVAL:
772
exitstatus = EX_USAGE;
773
goto fallback;
774
}
775
776
{
777
char *pluginhelperenv;
778
bool bret = true;
779
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
780
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
781
if(ret != -1){
782
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
783
}
784
if(ret == -1 or not bret){
785
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
786
" environment variable to \"%s\" for all plugins\n",
787
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
788
}
789
if(ret != -1){
790
free(pluginhelperenv);
791
}
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
792
650
}
793
651
794
652
if(debug){
805
663
}
806
664
}
807
665
808
if(getuid() == 0){
809
/* Work around Debian bug #633582:
810
<https://bugs.debian.org/633582> */
811
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
812
if(plugindir_fd == -1){
813
if(errno != ENOENT){
814
error(0, errno, "open(\"" PDIR "\")");
815
}
816
} else {
817
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
818
if(ret == -1){
819
error(0, errno, "fstat");
820
} else {
821
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
822
ret = fchown(plugindir_fd, uid, gid);
823
if(ret == -1){
824
error(0, errno, "fchown");
825
}
826
}
827
}
828
close(plugindir_fd);
829
}
830
}
831
832
/* Lower permissions */
833
ret = setgid(gid);
834
if(ret == -1){
835
error(0, errno, "setgid");
836
}
666
/* Strip permissions down to nobody */
837
667
ret = setuid(uid);
838
668
if(ret == -1){
839
error(0, errno, "setuid");
840
}
841
842
/* Open plugin directory with close_on_exec flag */
669
perror("setuid");
670
}
671
setgid(gid);
672
if(ret == -1){
673
perror("setgid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
682
if(dir == NULL){
683
perror("Could not open plugin dir");
684
exitstatus = EXIT_FAILURE;
685
goto fallback;
686
}
687
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
843
689
{
844
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
845
#ifdef O_CLOEXEC
846
O_CLOEXEC
847
#else /* not O_CLOEXEC */
848
0
849
#endif /* not O_CLOEXEC */
850
);
851
if(dir_fd == -1){
852
error(0, errno, "Could not open plugin dir");
853
exitstatus = EX_UNAVAILABLE;
854
goto fallback;
855
}
856
857
#ifndef O_CLOEXEC
858
/* Set the FD_CLOEXEC flag on the directory */
859
ret = set_cloexec_flag(dir_fd);
860
if(ret < 0){
861
error(0, errno, "set_cloexec_flag");
862
exitstatus = EX_OSERR;
863
goto fallback;
864
}
865
#endif /* O_CLOEXEC */
866
}
867
868
int good_name(const struct dirent * const dirent){
869
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
870
"*.dpkg-old", "*.dpkg-bak",
871
"*.dpkg-divert", NULL };
872
#ifdef __GNUC__
873
#pragma GCC diagnostic push
874
#pragma GCC diagnostic ignored "-Wcast-qual"
875
#endif
876
for(const char **pat = (const char **)patterns;
877
*pat != NULL; pat++){
878
#ifdef __GNUC__
879
#pragma GCC diagnostic pop
880
#endif
881
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
882
!= FNM_NOMATCH){
883
if(debug){
884
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
885
" matching pattern %s\n", dirent->d_name, *pat);
886
}
887
return 0;
690
int dir_fd = dirfd(dir);
691
if(dir_fd >= 0){
692
ret = set_cloexec_flag(dir_fd);
693
if(ret < 0){
694
perror("set_cloexec_flag");
695
exitstatus = EXIT_FAILURE;
696
goto fallback;
888
697
}
889
698
}
890
return 1;
891
}
892
893
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
894
alphasort);
895
if(numplugins == -1){
896
error(0, errno, "Could not scan plugin dir");
897
direntries = NULL;
898
exitstatus = EX_OSERR;
899
goto fallback;
900
699
}
901
700
902
701
FD_ZERO(&rfds_all);
903
702
904
703
/* Read and execute any executable in the plugin directory*/
905
for(int i = 0; i < numplugins; i++){
906
907
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
908
if(plugin_fd == -1){
909
error(0, errno, "Could not open plugin");
910
free(direntries[i]);
704
while(true){
705
dirst = readdir(dir);
706
707
/* All directory entries have been processed */
708
if(dirst == NULL){
709
if(errno == EBADF){
710
perror("readdir");
711
exitstatus = EXIT_FAILURE;
712
goto fallback;
713
}
714
break;
715
}
716
717
d_name_len = strlen(dirst->d_name);
718
719
/* Ignore dotfiles, backup files and other junk */
720
{
721
bool bad_name = false;
722
723
const char const *bad_prefixes[] = { ".", "#", NULL };
724
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
".dpkg-old",
727
".dpkg-bak",
728
".dpkg-divert", NULL };
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
size_t pre_len = strlen(*pre);
731
if((d_name_len >= pre_len)
732
and strncmp((dirst->d_name), *pre, pre_len) == 0){
733
if(debug){
734
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
735
" with bad prefix %s\n", dirst->d_name, *pre);
736
}
737
bad_name = true;
738
break;
739
}
740
}
741
if(bad_name){
742
continue;
743
}
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
size_t suf_len = strlen(*suf);
746
if((d_name_len >= suf_len)
747
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
748
== 0)){
749
if(debug){
750
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
751
" with bad suffix %s\n", dirst->d_name, *suf);
752
}
753
bad_name = true;
754
break;
755
}
756
}
757
758
if(bad_name){
759
continue;
760
}
761
}
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
911
771
continue;
912
772
}
913
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
773
774
ret = stat(filename, &st);
914
775
if(ret == -1){
915
error(0, errno, "stat");
916
close(plugin_fd);
917
free(direntries[i]);
776
perror("stat");
777
free(filename);
918
778
continue;
919
779
}
920
780
921
781
/* Ignore non-executable files */
922
if(not S_ISREG(st.st_mode)
923
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
924
X_OK, 0)) != 0)){
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
925
783
if(debug){
926
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
927
" with bad type or mode\n",
928
plugindir != NULL ? plugindir : PDIR,
929
direntries[i]->d_name);
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
" with bad type or mode\n", filename);
930
786
}
931
close(plugin_fd);
932
free(direntries[i]);
787
free(filename);
933
788
continue;
934
789
}
935
790
936
plugin *p = getplugin(direntries[i]->d_name);
791
plugin *p = getplugin(dirst->d_name);
937
792
if(p == NULL){
938
error(0, errno, "getplugin");
939
close(plugin_fd);
940
free(direntries[i]);
793
perror("getplugin");
794
free(filename);
941
795
continue;
942
796
}
943
797
if(p->disabled){
944
798
if(debug){
945
799
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
946
direntries[i]->d_name);
800
dirst->d_name);
947
801
}
948
close(plugin_fd);
949
free(direntries[i]);
802
free(filename);
950
803
continue;
951
804
}
952
805
{
955
808
if(g != NULL){
956
809
for(char **a = g->argv + 1; *a != NULL; a++){
957
810
if(not add_argument(p, *a)){
958
error(0, errno, "add_argument");
811
perror("add_argument");
959
812
}
960
813
}
961
814
/* Add global environment variables */
962
815
for(char **e = g->environ; *e != NULL; e++){
963
816
if(not add_environment(p, *e, false)){
964
error(0, errno, "add_environment");
817
perror("add_environment");
965
818
}
966
819
}
967
820
}
968
821
}
969
/* If this plugin has any environment variables, we need to
970
duplicate the environment from this process, too. */
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
971
825
if(p->environ[0] != NULL){
972
826
for(char **e = environ; *e != NULL; e++){
973
827
if(not add_environment(p, *e, false)){
974
error(0, errno, "add_environment");
828
perror("add_environment");
975
829
}
976
830
}
977
831
}
978
832
979
833
int pipefd[2];
980
#ifndef O_CLOEXEC
981
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
982
#else /* O_CLOEXEC */
983
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
984
#endif /* O_CLOEXEC */
834
ret = pipe(pipefd);
985
835
if(ret == -1){
986
error(0, errno, "pipe");
987
exitstatus = EX_OSERR;
988
free(direntries[i]);
989
goto fallback;
990
}
991
if(pipefd[0] >= FD_SETSIZE){
992
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
993
FD_SETSIZE);
994
close(pipefd[0]);
995
close(pipefd[1]);
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
#ifndef O_CLOEXEC
836
perror("pipe");
837
exitstatus = EXIT_FAILURE;
838
goto fallback;
839
}
1001
840
/* Ask OS to automatic close the pipe on exec */
1002
841
ret = set_cloexec_flag(pipefd[0]);
1003
842
if(ret < 0){
1004
error(0, errno, "set_cloexec_flag");
1005
close(pipefd[0]);
1006
close(pipefd[1]);
1007
exitstatus = EX_OSERR;
1008
free(direntries[i]);
843
perror("set_cloexec_flag");
844
exitstatus = EXIT_FAILURE;
1009
845
goto fallback;
1010
846
}
1011
847
ret = set_cloexec_flag(pipefd[1]);
1012
848
if(ret < 0){
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
849
perror("set_cloexec_flag");
850
exitstatus = EXIT_FAILURE;
1018
851
goto fallback;
1019
852
}
1020
#endif /* not O_CLOEXEC */
1021
853
/* Block SIGCHLD until process is safely in process list */
1022
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1023
&sigchld_action.sa_mask,
1024
NULL));
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1025
855
if(ret < 0){
1026
error(0, errno, "sigprocmask");
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
856
perror("sigprocmask");
857
exitstatus = EXIT_FAILURE;
1029
858
goto fallback;
1030
859
}
1031
860
/* Starting a new process to be watched */
1032
pid_t pid;
1033
do {
1034
pid = fork();
1035
} while(pid == -1 and errno == EINTR);
861
pid_t pid = fork();
1036
862
if(pid == -1){
1037
error(0, errno, "fork");
1038
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1039
&sigchld_action.sa_mask, NULL));
1040
close(pipefd[0]);
1041
close(pipefd[1]);
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
863
perror("fork");
864
exitstatus = EXIT_FAILURE;
1044
865
goto fallback;
1045
866
}
1046
867
if(pid == 0){
1047
868
/* this is the child process */
1048
869
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1049
870
if(ret < 0){
1050
error(0, errno, "sigaction");
1051
_exit(EX_OSERR);
871
perror("sigaction");
872
_exit(EXIT_FAILURE);
1052
873
}
1053
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
875
if(ret < 0){
1055
error(0, errno, "sigprocmask");
1056
_exit(EX_OSERR);
876
perror("sigprocmask");
877
_exit(EXIT_FAILURE);
1057
878
}
1058
879
1059
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1060
881
if(ret == -1){
1061
error(0, errno, "dup2");
1062
_exit(EX_OSERR);
882
perror("dup2");
883
_exit(EXIT_FAILURE);
1063
884
}
1064
885
1065
if(fexecve(plugin_fd, p->argv,
1066
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1067
error(0, errno, "fexecve for %s/%s",
1068
plugindir != NULL ? plugindir : PDIR,
1069
direntries[i]->d_name);
1070
_exit(EX_OSERR);
886
if(dirfd(dir) < 0){
887
/* If dir has no file descriptor, we could not set FD_CLOEXEC
888
above and must now close it manually here. */
889
closedir(dir);
890
}
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
1071
901
}
1072
902
/* no return */
1073
903
}
1074
904
/* Parent process */
1075
905
close(pipefd[1]); /* Close unused write end of pipe */
1076
close(plugin_fd);
1077
plugin *new_plugin = getplugin(direntries[i]->d_name);
906
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
1078
908
if(new_plugin == NULL){
1079
error(0, errno, "getplugin");
1080
ret = (int)(TEMP_FAILURE_RETRY
1081
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1082
NULL)));
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1083
911
if(ret < 0){
1084
error(0, errno, "sigprocmask");
912
perror("sigprocmask");
1085
913
}
1086
exitstatus = EX_OSERR;
1087
free(direntries[i]);
914
exitstatus = EXIT_FAILURE;
1088
915
goto fallback;
1089
916
}
1090
free(direntries[i]);
1091
917
1092
918
new_plugin->pid = pid;
1093
919
new_plugin->fd = pipefd[0];
1094
920
1095
921
/* Unblock SIGCHLD so signal handler can be run if this process
1096
922
has already completed */
1097
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1098
&sigchld_action.sa_mask,
1099
NULL));
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1100
924
if(ret < 0){
1101
error(0, errno, "sigprocmask");
1102
exitstatus = EX_OSERR;
925
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
1103
927
goto fallback;
1104
928
}
1105
929
1110
934
}
1111
935
}
1112
936
1113
free(direntries);
1114
direntries = NULL;
1115
close(dir_fd);
1116
dir_fd = -1;
1117
free_plugin(getplugin(NULL));
937
closedir(dir);
938
dir = NULL;
1118
939
1119
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
1120
941
if(p->pid != 0){
1131
952
while(plugin_list){
1132
953
fd_set rfds = rfds_all;
1133
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1134
if(select_ret == -1 and errno != EINTR){
1135
error(0, errno, "select");
1136
exitstatus = EX_OSERR;
955
if(select_ret == -1){
956
perror("select");
957
exitstatus = EXIT_FAILURE;
1137
958
goto fallback;
1138
959
}
1139
960
/* OK, now either a process completed, or something can be read
1145
966
if(not WIFEXITED(proc->status)
1146
967
or WEXITSTATUS(proc->status) != 0){
1147
968
/* Bad exit by plugin */
1148
969
1149
970
if(debug){
1150
971
if(WIFEXITED(proc->status)){
1151
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1152
" status %d\n", proc->name,
1153
(intmax_t) (proc->pid),
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
1154
974
WEXITSTATUS(proc->status));
1155
975
} else if(WIFSIGNALED(proc->status)){
1156
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1157
" signal %d: %s\n", proc->name,
1158
(intmax_t) (proc->pid),
1159
WTERMSIG(proc->status),
1160
strsignal(WTERMSIG(proc->status)));
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
978
WTERMSIG(proc->status));
979
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
1161
982
}
1162
983
}
1163
984
1164
985
/* Remove the plugin */
1165
986
FD_CLR(proc->fd, &rfds_all);
1166
987
1167
988
/* Block signal while modifying process_list */
1168
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1169
(SIG_BLOCK,
1170
&sigchld_action.sa_mask,
1171
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1172
990
if(ret < 0){
1173
error(0, errno, "sigprocmask");
1174
exitstatus = EX_OSERR;
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1175
993
goto fallback;
1176
994
}
1177
995
1180
998
proc = next_plugin;
1181
999
1182
1000
/* We are done modifying process list, so unblock signal */
1183
ret = (int)(TEMP_FAILURE_RETRY
1184
(sigprocmask(SIG_UNBLOCK,
1185
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1186
1003
if(ret < 0){
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1189
1006
goto fallback;
1190
1007
}
1191
1008
1201
1018
bool bret = print_out_password(proc->buffer,
1202
1019
proc->buffer_length);
1203
1020
if(not bret){
1204
error(0, errno, "print_out_password");
1205
exitstatus = EX_IOERR;
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1206
1023
}
1207
1024
goto fallback;
1208
1025
}
1215
1032
}
1216
1033
/* Before reading, make the process' data buffer large enough */
1217
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1218
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1219
+ (size_t) BUFFER_SIZE);
1220
if(new_buffer == NULL){
1221
error(0, errno, "malloc");
1222
exitstatus = EX_OSERR;
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1223
1040
goto fallback;
1224
1041
}
1225
proc->buffer = new_buffer;
1226
1042
proc->buffer_size += BUFFER_SIZE;
1227
1043
}
1228
1044
/* Read from the process */
1229
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1230
proc->buffer
1231
+ proc->buffer_length,
1232
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1233
1047
if(sret < 0){
1234
1048
/* Read error from this process; ignore the error */
1235
1049
proc = proc->next;
1243
1057
}
1244
1058
}
1245
1059
}
1246
1247
1060
1061
1248
1062
fallback:
1249
1063
1250
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1251
and exitstatus != EX_OK)){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1252
1065
/* Fallback if all plugins failed, none are found or an error
1253
1066
occured */
1254
1067
bool bret;
1262
1075
}
1263
1076
bret = print_out_password(passwordbuffer, len);
1264
1077
if(not bret){
1265
error(0, errno, "print_out_password");
1266
exitstatus = EX_IOERR;
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1267
1080
}
1268
1081
}
1269
1082
1270
1083
/* Restore old signal handler */
1271
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1272
1085
if(ret == -1){
1273
error(0, errno, "sigaction");
1274
exitstatus = EX_OSERR;
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1275
1088
}
1276
1089
1277
1090
if(custom_argv != NULL){
1281
1094
free(custom_argv);
1282
1095
}
1283
1096
1284
free(direntries);
1285
1286
if(dir_fd != -1){
1287
close(dir_fd);
1097
if(dir != NULL){
1098
closedir(dir);
1288
1099
}
1289
1100
1290
1101
/* Kill the processes */
1294
1105
ret = kill(p->pid, SIGTERM);
1295
1106
if(ret == -1 and errno != ESRCH){
1296
1107
/* Set-uid proccesses might not get closed */
1297
error(0, errno, "kill");
1108
perror("kill");
1298
1109
}
1299
1110
}
1300
1111
}
1301
1112
1302
1113
/* Wait for any remaining child processes to terminate */
1303
do {
1114
do{
1304
1115
ret = wait(NULL);
1305
1116
} while(ret >= 0);
1306
1117
if(errno != ECHILD){
1307
error(0, errno, "wait");
1118
perror("wait");
1308
1119
}
1309
1120
1310
1121
free_plugin_list();
1311
1122
1312
1123
free(plugindir);
1313
free(pluginhelperdir);
1314
1124
free(argfile);
1315
1125
1316
1126
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0