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 1261
- compare with another revision
- download diff
- download tarball
- view history from revision 1261
- Committer: Teddy Hogeborn
- Date: 2022-04-25 20:09:43 UTC
- mfrom: (237.4.138 release)
- Revision ID: teddy@recompile.se-20220425200943-e154ee7jf6df1uso
Merge from release branch
- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
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
5
* Copyright © 2008-2022 Teddy Hogeborn
6
* Copyright © 2008-2022 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
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
17
19
*
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
21
22
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
27
getline(), asprintf(), O_CLOEXEC,
28
scandirat(), pipe2() */
29
#include <argp.h> /* argp_program_version,
30
argp_program_bug_address,
31
struct argp_option,
32
struct argp_state, argp_error(),
33
ARGP_NO_EXIT, argp_state_help,
34
ARGP_HELP_STD_HELP,
35
ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
36
ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
37
struct argp, argp_parse(),
38
ARGP_IN_ORDER, ARGP_NO_HELP */
39
#include <stdbool.h> /* bool, false, true */
40
#include <sys/types.h> /* pid_t, sig_atomic_t, uid_t, gid_t,
41
getuid(), setgid(), setuid() */
27
42
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
FD_SET(), FD_ISSET(), FD_CLR */
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
46
readdir(), closedir(), dirfd() */
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
fcntl(), setuid(), setgid(),
49
F_GETFD, F_SETFD, FD_CLOEXEC,
50
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
52
execv(), write(), read(),
53
close() */
43
#include <iso646.h> /* or, and, not */
44
#include <string.h> /* strcmp(), strdup(), strchrnul(),
45
strncmp(), strlen(), strcpy(),
46
strsep(), strchr(), strsignal() */
47
#include <stdlib.h> /* malloc(), free(), reallocarray(),
48
realloc(), EXIT_SUCCESS */
49
#include <errno.h> /* errno, EINTR, ENOMEM, ECHILD,
50
error_t, EINVAL, EMFILE, ENFILE,
51
ENOENT, ESRCH */
52
#include <stdint.h> /* SIZE_MAX */
53
#define _GNU_SOURCE /* strchrnul(), TEMP_FAILURE_RETRY(),
54
getline(), asprintf(), O_CLOEXEC,
55
scandirat(), pipe2() */
56
#include <unistd.h> /* TEMP_FAILURE_RETRY(), ssize_t,
57
write(), STDOUT_FILENO, uid_t,
58
gid_t, getuid(), fchown(), close(),
59
symlink(), setgid(), setuid(),
60
faccessat(), X_OK, pipe(), pipe2(),
61
fork(), _exit(), dup2(), fexecve(),
62
read(), getpass() */
54
63
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
58
#include <errno.h> /* errno */
59
#include <argp.h> /* struct argp_option, struct
60
argp_state, struct argp,
61
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
64
#include <signal.h> /* struct sigaction, sigemptyset(),
65
sigaddset(), sigaction(),
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
64
FD_CLOEXEC, open(), O_RDONLY,
65
O_CLOEXEC, openat() */
66
#include <sys/wait.h> /* waitpid(), WNOHANG, WIFEXITED(),
67
WEXITSTATUS(), WIFSIGNALED(),
68
WTERMSIG(), wait() */
69
#include <error.h> /* error() */
70
#include <stdio.h> /* FILE, fprintf(), fopen(),
71
getline(), fclose(), EOF,
72
asprintf(), stderr */
73
#include <dirent.h> /* struct dirent, scandirat(),
74
alphasort() */
75
#include <sys/stat.h> /* struct stat, fstat(), S_ISDIR(),
76
lstat(), S_ISREG() */
77
#include <sys/select.h> /* fd_set, FD_ZERO(), FD_SETSIZE,
78
FD_SET(), select(), FD_CLR(),
79
FD_ISSET() */
80
#include <signal.h> /* struct sigaction, SA_NOCLDSTOP,
81
sigemptyset(), sigaddset(),
82
SIGCHLD, sigprocmask(), SIG_BLOCK,
83
SIG_UNBLOCK, kill(), SIGTERM */
71
84
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
85
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
86
#include <inttypes.h> /* intmax_t, strtoimax(), PRIdMAX */
87
#include <fnmatch.h> /* fnmatch(), FNM_FILE_NAME,
88
FNM_PERIOD, FNM_NOMATCH */
73
89
74
90
#define BUFFER_SIZE 256
75
91
76
92
#define PDIR "/lib/mandos/plugins.d"
93
#define PHDIR "/lib/mandos/plugin-helpers"
77
94
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
95
79
96
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
97
const char *argp_program_bug_address = "<mandos@recompile.se>";
81
98
82
99
typedef struct plugin{
83
100
char *name; /* can be NULL or any plugin name */
103
120
104
121
/* Gets an existing plugin based on name,
105
122
or if none is found, creates a new one */
123
__attribute__((warn_unused_result))
106
124
static plugin *getplugin(char *name){
107
125
/* Check for existing plugin with that name */
108
126
for(plugin *p = plugin_list; p != NULL; p = p->next){
169
187
}
170
188
171
189
/* Helper function for add_argument and add_environment */
190
__attribute__((nonnull, warn_unused_result))
172
191
static bool add_to_char_array(const char *new, char ***array,
173
192
int *len){
174
193
/* Resize the pointed-to array to hold one more pointer */
194
char **new_array = NULL;
175
195
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
197
new_array = reallocarray(*array, (size_t)((*len) + 2),
198
sizeof(char *));
199
#else
200
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
201
/* overflow */
202
new_array = NULL;
203
errno = ENOMEM;
204
} else {
205
new_array = realloc(*array, (size_t)((*len) + 2)
206
* sizeof(char *));
207
}
208
#endif
209
} while(new_array == NULL and errno == EINTR);
179
210
/* Malloc check */
180
if(*array == NULL){
211
if(new_array == NULL){
181
212
return false;
182
213
}
214
*array = new_array;
183
215
/* Make a copy of the new string */
184
216
char *copy;
185
217
do {
197
229
}
198
230
199
231
/* Add to a plugin's argument vector */
232
__attribute__((nonnull(2), warn_unused_result))
200
233
static bool add_argument(plugin *p, const char *arg){
201
234
if(p == NULL){
202
235
return false;
205
238
}
206
239
207
240
/* Add to a plugin's environment */
241
__attribute__((nonnull(2), warn_unused_result))
208
242
static bool add_environment(plugin *p, const char *def, bool replace){
209
243
if(p == NULL){
210
244
return false;
212
246
/* namelen = length of name of environment variable */
213
247
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
248
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
249
for(char **envdef = p->environ; *envdef != NULL; envdef++){
250
if(strncmp(*envdef, def, namelen + 1) == 0){
217
251
/* It already exists */
218
252
if(replace){
219
char *new;
253
char *new_envdef;
220
254
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
255
new_envdef = realloc(*envdef, strlen(def) + 1);
256
} while(new_envdef == NULL and errno == EINTR);
257
if(new_envdef == NULL){
224
258
return false;
225
259
}
226
*e = new;
227
strcpy(*e, def);
260
*envdef = new_envdef;
261
strcpy(*envdef, def);
228
262
}
229
263
return true;
230
264
}
232
266
return add_to_char_array(def, &(p->environ), &(p->envc));
233
267
}
234
268
269
#ifndef O_CLOEXEC
235
270
/*
236
271
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
272
* Descriptor Flags".
238
273
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
239
274
*/
275
__attribute__((warn_unused_result))
240
276
static int set_cloexec_flag(int fd){
241
277
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
278
/* If reading the flags failed, return error indication now. */
247
283
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
284
ret | FD_CLOEXEC));
249
285
}
286
#endif /* not O_CLOEXEC */
250
287
251
288
252
289
/* Mark processes as completed when they exit, and save their exit
266
303
/* No child processes */
267
304
break;
268
305
}
269
perror("waitpid");
306
error(0, errno, "waitpid");
270
307
}
271
308
272
309
/* A child exited, find it in process_list */
284
321
}
285
322
286
323
/* Prints out a password to stdout */
324
__attribute__((nonnull, warn_unused_result))
287
325
static bool print_out_password(const char *buffer, size_t length){
288
326
ssize_t ret;
289
327
for(size_t written = 0; written < length; written += (size_t)ret){
297
335
}
298
336
299
337
/* Removes and free a plugin from the plugin list */
338
__attribute__((nonnull))
300
339
static void free_plugin(plugin *plugin_node){
301
340
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
341
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
303
342
free(*arg);
304
343
}
344
free(plugin_node->name);
305
345
free(plugin_node->argv);
306
346
for(char **env = plugin_node->environ; *env != NULL; env++){
307
347
free(*env);
334
374
335
375
int main(int argc, char *argv[]){
336
376
char *plugindir = NULL;
377
char *pluginhelperdir = NULL;
337
378
char *argfile = NULL;
338
379
FILE *conffp;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
380
struct dirent **direntries = NULL;
342
381
struct stat st;
343
382
fd_set rfds_all;
344
383
int ret, maxfd = 0;
352
391
.sa_flags = SA_NOCLDSTOP };
353
392
char **custom_argv = NULL;
354
393
int custom_argc = 0;
394
int dir_fd = -1;
355
395
356
396
/* Establish a signal handler */
357
397
sigemptyset(&sigchld_action.sa_mask);
358
398
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
399
if(ret == -1){
360
perror("sigaddset");
400
error(0, errno, "sigaddset");
361
401
exitstatus = EX_OSERR;
362
402
goto fallback;
363
403
}
364
404
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
405
if(ret == -1){
366
perror("sigaction");
406
error(0, errno, "sigaction");
367
407
exitstatus = EX_OSERR;
368
408
goto fallback;
369
409
}
402
442
.doc = "Group ID the plugins will run as", .group = 3 },
403
443
{ .name = "debug", .key = 132,
404
444
.doc = "Debug mode", .group = 4 },
445
{ .name = "plugin-helper-dir", .key = 133,
446
.arg = "DIRECTORY",
447
.doc = "Specify a different plugin helper directory",
448
.group = 2 },
405
449
/*
406
450
* These reproduce what we would get without ARGP_NO_HELP
407
451
*/
414
458
{ .name = NULL }
415
459
};
416
460
461
__attribute__((nonnull(3)))
417
462
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
463
errno = 0;
419
464
switch(key){
420
465
char *tmp;
421
intmax_t tmpmax;
466
intmax_t tmp_id;
422
467
case 'g': /* --global-options */
423
468
{
424
469
char *plugin_option;
427
472
break;
428
473
}
429
474
}
475
errno = 0;
430
476
}
431
477
break;
432
478
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
479
if(add_environment(getplugin(NULL), arg, true)){
480
errno = 0;
481
}
434
482
break;
435
483
case 'o': /* --options-for */
436
484
{
453
501
break;
454
502
}
455
503
}
504
errno = 0;
456
505
}
457
506
break;
458
507
case 'E': /* --env-for */
470
519
errno = EINVAL;
471
520
break;
472
521
}
473
add_environment(getplugin(arg), envdef, true);
522
if(add_environment(getplugin(arg), envdef, true)){
523
errno = 0;
524
}
474
525
}
475
526
break;
476
527
case 'd': /* --disable */
478
529
plugin *p = getplugin(arg);
479
530
if(p != NULL){
480
531
p->disabled = true;
532
errno = 0;
481
533
}
482
534
}
483
535
break;
486
538
plugin *p = getplugin(arg);
487
539
if(p != NULL){
488
540
p->disabled = false;
541
errno = 0;
489
542
}
490
543
}
491
544
break;
492
545
case 128: /* --plugin-dir */
493
546
free(plugindir);
494
547
plugindir = strdup(arg);
548
if(plugindir != NULL){
549
errno = 0;
550
}
495
551
break;
496
552
case 129: /* --config-file */
497
553
/* This is already done by parse_opt_config_file() */
498
554
break;
499
555
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
556
tmp_id = strtoimax(arg, &tmp, 10);
501
557
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
558
or tmp_id != (uid_t)tmp_id){
503
559
argp_error(state, "Bad user ID number: \"%s\", using %"
504
560
PRIdMAX, arg, (intmax_t)uid);
505
561
break;
506
562
}
507
uid = (uid_t)tmpmax;
563
uid = (uid_t)tmp_id;
564
errno = 0;
508
565
break;
509
566
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
567
tmp_id = strtoimax(arg, &tmp, 10);
511
568
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
569
or tmp_id != (gid_t)tmp_id){
513
570
argp_error(state, "Bad group ID number: \"%s\", using %"
514
571
PRIdMAX, arg, (intmax_t)gid);
515
572
break;
516
573
}
517
gid = (gid_t)tmpmax;
574
gid = (gid_t)tmp_id;
575
errno = 0;
518
576
break;
519
577
case 132: /* --debug */
520
578
debug = true;
521
579
break;
580
case 133: /* --plugin-helper-dir */
581
free(pluginhelperdir);
582
pluginhelperdir = strdup(arg);
583
if(pluginhelperdir != NULL){
584
errno = 0;
585
}
586
break;
522
587
/*
523
588
* These reproduce what we would get without ARGP_NO_HELP
524
589
*/
525
590
case '?': /* --help */
526
591
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
592
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
593
__builtin_unreachable();
528
594
case -3: /* --usage */
529
595
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
596
argp_state_help(state, state->out_stream,
531
597
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
598
__builtin_unreachable();
532
599
case 'V': /* --version */
533
600
fprintf(state->out_stream, "%s\n", argp_program_version);
534
601
exit(EXIT_SUCCESS);
544
611
if(arg[0] == '\0'){
545
612
break;
546
613
}
614
#if __GNUC__ >= 7
615
__attribute__((fallthrough));
616
#else
617
/* FALLTHROUGH */
618
#endif
547
619
default:
548
620
return ARGP_ERR_UNKNOWN;
549
621
}
568
640
case 129: /* --config-file */
569
641
free(argfile);
570
642
argfile = strdup(arg);
643
if(argfile != NULL){
644
errno = 0;
645
}
571
646
break;
572
647
case 130: /* --userid */
573
648
case 131: /* --groupid */
574
649
case 132: /* --debug */
650
case 133: /* --plugin-helper-dir */
575
651
case '?': /* --help */
576
652
case -3: /* --usage */
577
653
case 'V': /* --version */
599
675
case ENOMEM:
600
676
default:
601
677
errno = ret;
602
perror("argp_parse");
678
error(0, errno, "argp_parse");
603
679
exitstatus = EX_OSERR;
604
680
goto fallback;
605
681
case EINVAL:
626
702
custom_argc = 1;
627
703
custom_argv = malloc(sizeof(char*) * 2);
628
704
if(custom_argv == NULL){
629
perror("malloc");
705
error(0, errno, "malloc");
630
706
exitstatus = EX_OSERR;
631
707
goto fallback;
632
708
}
649
725
}
650
726
new_arg = strdup(p);
651
727
if(new_arg == NULL){
652
perror("strdup");
728
error(0, errno, "strdup");
653
729
exitstatus = EX_OSERR;
654
730
free(org_line);
655
731
goto fallback;
656
732
}
657
733
658
734
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
735
{
736
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
737
char **new_argv = reallocarray(custom_argv,
738
(size_t)custom_argc + 1,
739
sizeof(char *));
740
#else
741
char **new_argv = NULL;
742
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
743
/* overflow */
744
errno = ENOMEM;
745
} else {
746
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
747
* sizeof(char *));
748
}
749
#endif
750
if(new_argv == NULL){
751
error(0, errno, "reallocarray");
752
exitstatus = EX_OSERR;
753
free(new_arg);
754
free(org_line);
755
goto fallback;
756
} else {
757
custom_argv = new_argv;
758
}
666
759
}
667
760
custom_argv[custom_argc-1] = new_arg;
668
761
custom_argv[custom_argc] = NULL;
672
765
ret = fclose(conffp);
673
766
} while(ret == EOF and errno == EINTR);
674
767
if(ret == EOF){
675
perror("fclose");
768
error(0, errno, "fclose");
676
769
exitstatus = EX_IOERR;
677
770
goto fallback;
678
771
}
681
774
/* Check for harmful errors and go to fallback. Other errors might
682
775
not affect opening plugins */
683
776
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
777
error(0, errno, "fopen");
685
778
exitstatus = EX_OSERR;
686
779
goto fallback;
687
780
}
698
791
case ENOMEM:
699
792
default:
700
793
errno = ret;
701
perror("argp_parse");
794
error(0, errno, "argp_parse");
702
795
exitstatus = EX_OSERR;
703
796
goto fallback;
704
797
case EINVAL:
718
811
case ENOMEM:
719
812
default:
720
813
errno = ret;
721
perror("argp_parse");
814
error(0, errno, "argp_parse");
722
815
exitstatus = EX_OSERR;
723
816
goto fallback;
724
817
case EINVAL:
726
819
goto fallback;
727
820
}
728
821
822
{
823
char *pluginhelperenv;
824
bool bret = true;
825
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
826
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
827
if(ret != -1){
828
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
829
}
830
if(ret == -1 or not bret){
831
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
832
" environment variable to \"%s\" for all plugins\n",
833
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
834
}
835
if(ret != -1){
836
free(pluginhelperenv);
837
}
838
}
839
729
840
if(debug){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
841
for(plugin *p = plugin_list; p != NULL; p = p->next){
731
842
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
843
p->name ? p->name : "Global", p->argc - 1);
733
844
for(char **a = p->argv; *a != NULL; a++){
740
851
}
741
852
}
742
853
743
/* Strip permissions down to nobody */
744
setgid(gid);
854
if(getuid() == 0){
855
/* Work around Debian bug #633582:
856
<https://bugs.debian.org/633582> */
857
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
858
if(plugindir_fd == -1){
859
if(errno != ENOENT){
860
error(0, errno, "open(\"" PDIR "\")");
861
}
862
} else {
863
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
864
if(ret == -1){
865
error(0, errno, "fstat");
866
} else {
867
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
868
ret = fchown(plugindir_fd, uid, gid);
869
if(ret == -1){
870
error(0, errno, "fchown");
871
}
872
}
873
}
874
close(plugindir_fd);
875
}
876
877
/* Work around Debian bug #981302
878
<https://bugs.debian.org/981302> */
879
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
880
ret = symlink("/proc/self/fd", "/dev/fd");
881
if(ret == -1){
882
error(0, errno, "Failed to create /dev/fd symlink");
883
}
884
}
885
}
886
887
/* Lower permissions */
888
ret = setgid(gid);
745
889
if(ret == -1){
746
perror("setgid");
890
error(0, errno, "setgid");
747
891
}
748
892
ret = setuid(uid);
749
893
if(ret == -1){
750
perror("setuid");
894
error(0, errno, "setuid");
751
895
}
752
896
753
897
/* Open plugin directory with close_on_exec flag */
754
898
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
899
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
900
#ifdef O_CLOEXEC
901
O_CLOEXEC
902
#else /* not O_CLOEXEC */
903
0
904
#endif /* not O_CLOEXEC */
905
);
773
906
if(dir_fd == -1){
774
perror("Could not open plugin dir");
907
error(0, errno, "Could not open plugin dir");
775
908
exitstatus = EX_UNAVAILABLE;
776
909
goto fallback;
777
910
}
780
913
/* Set the FD_CLOEXEC flag on the directory */
781
914
ret = set_cloexec_flag(dir_fd);
782
915
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
916
error(0, errno, "set_cloexec_flag");
785
917
exitstatus = EX_OSERR;
786
918
goto fallback;
787
919
}
788
920
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
921
}
922
923
int good_name(const struct dirent * const dirent){
924
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
925
"*.dpkg-old", "*.dpkg-bak",
926
"*.dpkg-divert", NULL };
927
#ifdef __GNUC__
928
#pragma GCC diagnostic push
929
#pragma GCC diagnostic ignored "-Wcast-qual"
930
#endif
931
for(const char **pat = (const char **)patterns;
932
*pat != NULL; pat++){
933
#ifdef __GNUC__
934
#pragma GCC diagnostic pop
935
#endif
936
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
937
!= FNM_NOMATCH){
938
if(debug){
939
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
940
" matching pattern %s\n", dirent->d_name, *pat);
941
}
942
return 0;
943
}
796
944
}
945
return 1;
946
}
947
948
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
949
alphasort);
950
if(numplugins == -1){
951
error(0, errno, "Could not scan plugin dir");
952
direntries = NULL;
953
exitstatus = EX_OSERR;
954
goto fallback;
797
955
}
798
956
799
957
FD_ZERO(&rfds_all);
800
958
801
959
/* Read and execute any executable in the plugin directory*/
802
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
806
807
/* All directory entries have been processed */
808
if(dirst == NULL){
809
if(errno == EBADF){
810
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
813
}
814
break;
815
}
816
817
d_name_len = strlen(dirst->d_name);
818
819
/* Ignore dotfiles, backup files and other junk */
820
{
821
bool bad_name = false;
822
823
const char const *bad_prefixes[] = { ".", "#", NULL };
824
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
".dpkg-old",
827
".dpkg-bak",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
833
if(debug){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
836
}
837
bad_name = true;
838
break;
839
}
840
}
841
if(bad_name){
842
continue;
843
}
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
== 0)){
849
if(debug){
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
852
}
853
bad_name = true;
854
break;
855
}
856
}
857
858
if(bad_name){
859
continue;
860
}
861
}
862
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
perror("asprintf");
960
for(int i = 0; i < numplugins; i++){
961
962
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
963
if(plugin_fd == -1){
964
error(0, errno, "Could not open plugin");
965
free(direntries[i]);
874
966
continue;
875
967
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
968
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
969
if(ret == -1){
879
perror("stat");
880
free(filename);
970
error(0, errno, "stat");
971
close(plugin_fd);
972
free(direntries[i]);
881
973
continue;
882
974
}
883
975
884
976
/* Ignore non-executable files */
885
977
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
978
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
979
X_OK, 0)) != 0)){
887
980
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
981
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
982
" with bad type or mode\n",
983
plugindir != NULL ? plugindir : PDIR,
984
direntries[i]->d_name);
890
985
}
891
free(filename);
986
close(plugin_fd);
987
free(direntries[i]);
892
988
continue;
893
989
}
894
990
895
plugin *p = getplugin(dirst->d_name);
991
plugin *p = getplugin(direntries[i]->d_name);
896
992
if(p == NULL){
897
perror("getplugin");
898
free(filename);
993
error(0, errno, "getplugin");
994
close(plugin_fd);
995
free(direntries[i]);
899
996
continue;
900
997
}
901
998
if(p->disabled){
902
999
if(debug){
903
1000
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
1001
direntries[i]->d_name);
905
1002
}
906
free(filename);
1003
close(plugin_fd);
1004
free(direntries[i]);
907
1005
continue;
908
1006
}
909
1007
{
912
1010
if(g != NULL){
913
1011
for(char **a = g->argv + 1; *a != NULL; a++){
914
1012
if(not add_argument(p, *a)){
915
perror("add_argument");
1013
error(0, errno, "add_argument");
916
1014
}
917
1015
}
918
1016
/* Add global environment variables */
919
1017
for(char **e = g->environ; *e != NULL; e++){
920
1018
if(not add_environment(p, *e, false)){
921
perror("add_environment");
1019
error(0, errno, "add_environment");
922
1020
}
923
1021
}
924
1022
}
925
1023
}
926
/* If this plugin has any environment variables, we will call
927
using execve and need to duplicate the environment from this
928
process, too. */
1024
/* If this plugin has any environment variables, we need to
1025
duplicate the environment from this process, too. */
929
1026
if(p->environ[0] != NULL){
930
1027
for(char **e = environ; *e != NULL; e++){
931
1028
if(not add_environment(p, *e, false)){
932
perror("add_environment");
1029
error(0, errno, "add_environment");
933
1030
}
934
1031
}
935
1032
}
936
1033
937
1034
int pipefd[2];
1035
#ifndef O_CLOEXEC
938
1036
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1037
#else /* O_CLOEXEC */
1038
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1039
#endif /* O_CLOEXEC */
939
1040
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1041
error(0, errno, "pipe");
1042
exitstatus = EX_OSERR;
1043
free(direntries[i]);
1044
goto fallback;
1045
}
1046
if(pipefd[0] >= FD_SETSIZE){
1047
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1048
FD_SETSIZE);
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
1053
goto fallback;
1054
}
1055
#ifndef O_CLOEXEC
944
1056
/* Ask OS to automatic close the pipe on exec */
945
1057
ret = set_cloexec_flag(pipefd[0]);
946
1058
if(ret < 0){
947
perror("set_cloexec_flag");
1059
error(0, errno, "set_cloexec_flag");
1060
close(pipefd[0]);
1061
close(pipefd[1]);
948
1062
exitstatus = EX_OSERR;
1063
free(direntries[i]);
949
1064
goto fallback;
950
1065
}
951
1066
ret = set_cloexec_flag(pipefd[1]);
952
1067
if(ret < 0){
953
perror("set_cloexec_flag");
1068
error(0, errno, "set_cloexec_flag");
1069
close(pipefd[0]);
1070
close(pipefd[1]);
954
1071
exitstatus = EX_OSERR;
1072
free(direntries[i]);
955
1073
goto fallback;
956
1074
}
1075
#endif /* not O_CLOEXEC */
957
1076
/* Block SIGCHLD until process is safely in process list */
958
1077
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1078
&sigchld_action.sa_mask,
960
1079
NULL));
961
1080
if(ret < 0){
962
perror("sigprocmask");
1081
error(0, errno, "sigprocmask");
963
1082
exitstatus = EX_OSERR;
1083
free(direntries[i]);
964
1084
goto fallback;
965
1085
}
966
1086
/* Starting a new process to be watched */
969
1089
pid = fork();
970
1090
} while(pid == -1 and errno == EINTR);
971
1091
if(pid == -1){
972
perror("fork");
1092
error(0, errno, "fork");
1093
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1094
&sigchld_action.sa_mask, NULL));
1095
close(pipefd[0]);
1096
close(pipefd[1]);
973
1097
exitstatus = EX_OSERR;
1098
free(direntries[i]);
974
1099
goto fallback;
975
1100
}
976
1101
if(pid == 0){
977
1102
/* this is the child process */
978
1103
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1104
if(ret < 0){
980
perror("sigaction");
1105
error(0, errno, "sigaction");
981
1106
_exit(EX_OSERR);
982
1107
}
983
1108
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1109
if(ret < 0){
985
perror("sigprocmask");
1110
error(0, errno, "sigprocmask");
986
1111
_exit(EX_OSERR);
987
1112
}
988
1113
989
1114
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1115
if(ret == -1){
991
perror("dup2");
1116
error(0, errno, "dup2");
992
1117
_exit(EX_OSERR);
993
1118
}
994
1119
995
if(dirfd(dir) < 0){
996
/* If dir has no file descriptor, we could not set FD_CLOEXEC
997
above and must now close it manually here. */
998
closedir(dir);
999
}
1000
if(p->environ[0] == NULL){
1001
if(execv(filename, p->argv) < 0){
1002
perror("execv");
1003
_exit(EX_OSERR);
1004
}
1005
} else {
1006
if(execve(filename, p->argv, p->environ) < 0){
1007
perror("execve");
1008
_exit(EX_OSERR);
1009
}
1120
if(fexecve(plugin_fd, p->argv,
1121
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1122
error(0, errno, "fexecve for %s/%s",
1123
plugindir != NULL ? plugindir : PDIR,
1124
direntries[i]->d_name);
1125
_exit(EX_OSERR);
1010
1126
}
1011
1127
/* no return */
1012
1128
}
1013
1129
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1130
close(pipefd[1]); /* Close unused write end of pipe */
1131
close(plugin_fd);
1132
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1133
if(new_plugin == NULL){
1019
perror("getplugin");
1134
error(0, errno, "getplugin");
1020
1135
ret = (int)(TEMP_FAILURE_RETRY
1021
1136
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1137
NULL)));
1023
1138
if(ret < 0){
1024
perror("sigprocmask");
1139
error(0, errno, "sigprocmask");
1025
1140
}
1026
1141
exitstatus = EX_OSERR;
1142
free(direntries[i]);
1027
1143
goto fallback;
1028
1144
}
1145
free(direntries[i]);
1029
1146
1030
1147
new_plugin->pid = pid;
1031
1148
new_plugin->fd = pipefd[0];
1032
1149
1150
if(debug){
1151
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1152
new_plugin->name, (intmax_t) (new_plugin->pid));
1153
}
1154
1033
1155
/* Unblock SIGCHLD so signal handler can be run if this process
1034
1156
has already completed */
1035
1157
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
1158
&sigchld_action.sa_mask,
1037
1159
NULL));
1038
1160
if(ret < 0){
1039
perror("sigprocmask");
1161
error(0, errno, "sigprocmask");
1040
1162
exitstatus = EX_OSERR;
1041
1163
goto fallback;
1042
1164
}
1043
1165
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1166
FD_SET(new_plugin->fd, &rfds_all);
1046
1167
1047
1168
if(maxfd < new_plugin->fd){
1048
1169
maxfd = new_plugin->fd;
1049
1170
}
1050
1171
}
1051
1172
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1173
free(direntries);
1174
direntries = NULL;
1175
close(dir_fd);
1176
dir_fd = -1;
1054
1177
free_plugin(getplugin(NULL));
1055
1178
1056
1179
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1192
fd_set rfds = rfds_all;
1070
1193
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1194
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1195
error(0, errno, "select");
1073
1196
exitstatus = EX_OSERR;
1074
1197
goto fallback;
1075
1198
}
1095
1218
(intmax_t) (proc->pid),
1096
1219
WTERMSIG(proc->status),
1097
1220
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1101
1221
}
1102
1222
}
1103
1223
1104
1224
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1225
FD_CLR(proc->fd, &rfds_all);
1107
1226
1108
1227
/* Block signal while modifying process_list */
1109
1228
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1230
&sigchld_action.sa_mask,
1112
1231
NULL));
1113
1232
if(ret < 0){
1114
perror("sigprocmask");
1233
error(0, errno, "sigprocmask");
1115
1234
exitstatus = EX_OSERR;
1116
1235
goto fallback;
1117
1236
}
1125
1244
(sigprocmask(SIG_UNBLOCK,
1126
1245
&sigchld_action.sa_mask, NULL)));
1127
1246
if(ret < 0){
1128
perror("sigprocmask");
1247
error(0, errno, "sigprocmask");
1129
1248
exitstatus = EX_OSERR;
1130
1249
goto fallback;
1131
1250
}
1142
1261
bool bret = print_out_password(proc->buffer,
1143
1262
proc->buffer_length);
1144
1263
if(not bret){
1145
perror("print_out_password");
1264
error(0, errno, "print_out_password");
1146
1265
exitstatus = EX_IOERR;
1147
1266
}
1148
1267
goto fallback;
1149
1268
}
1150
1269
1151
1270
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1271
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1272
/* This process had nothing to say at this time */
1156
1273
proc = proc->next;
1157
1274
continue;
1158
1275
}
1159
1276
/* Before reading, make the process' data buffer large enough */
1160
1277
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1278
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1279
+ (size_t) BUFFER_SIZE);
1280
if(new_buffer == NULL){
1281
error(0, errno, "malloc");
1165
1282
exitstatus = EX_OSERR;
1166
1283
goto fallback;
1167
1284
}
1285
proc->buffer = new_buffer;
1168
1286
proc->buffer_size += BUFFER_SIZE;
1169
1287
}
1170
1288
/* Read from the process */
1204
1322
}
1205
1323
bret = print_out_password(passwordbuffer, len);
1206
1324
if(not bret){
1207
perror("print_out_password");
1325
error(0, errno, "print_out_password");
1208
1326
exitstatus = EX_IOERR;
1209
1327
}
1210
1328
}
1212
1330
/* Restore old signal handler */
1213
1331
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1332
if(ret == -1){
1215
perror("sigaction");
1333
error(0, errno, "sigaction");
1216
1334
exitstatus = EX_OSERR;
1217
1335
}
1218
1336
1223
1341
free(custom_argv);
1224
1342
}
1225
1343
1226
if(dir != NULL){
1227
closedir(dir);
1344
free(direntries);
1345
1346
if(dir_fd != -1){
1347
close(dir_fd);
1228
1348
}
1229
1349
1230
1350
/* Kill the processes */
1234
1354
ret = kill(p->pid, SIGTERM);
1235
1355
if(ret == -1 and errno != ESRCH){
1236
1356
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1357
error(0, errno, "kill");
1238
1358
}
1239
1359
}
1240
1360
}
1244
1364
ret = wait(NULL);
1245
1365
} while(ret >= 0);
1246
1366
if(errno != ECHILD){
1247
perror("wait");
1367
error(0, errno, "wait");
1248
1368
}
1249
1369
1250
1370
free_plugin_list();
1251
1371
1252
1372
free(plugindir);
1373
free(pluginhelperdir);
1253
1374
free(argfile);
1254
1375
1255
1376
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0