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 963
- compare with another revision
- download diff
- download tarball
- view history from revision 963
- Committer: Teddy Hogeborn
- Date: 2019-02-09 23:31:44 UTC
- Revision ID: teddy@recompile.se-20190209233144-5ewmrgezdqridssj
* TODO (Use raw public keys): Remove.
- files added:
- DBUS-API
- debian/source
- debian/upstream
- 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 © 2008-2018 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
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
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
27
O_CLOEXEC, pipe2() */
27
28
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
30
31
#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() */
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() */
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
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
44
43
#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() */
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
*/
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
58
57
#include <errno.h> /* errno */
59
58
#include <argp.h> /* struct argp_option, struct
60
59
argp_state, struct argp,
68
67
*/
69
68
#include <errno.h> /* errno, EBADF */
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE */
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() */
72
75
73
76
#define BUFFER_SIZE 256
74
77
75
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
76
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
77
81
78
82
const char *argp_program_version = "plugin-runner " VERSION;
79
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
84
81
85
typedef struct plugin{
82
86
char *name; /* can be NULL or any plugin name */
102
106
103
107
/* Gets an existing plugin based on name,
104
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
105
110
static plugin *getplugin(char *name){
106
111
/* Check for existing plugin with that name */
107
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
168
173
}
169
174
170
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
171
177
static bool add_to_char_array(const char *new, char ***array,
172
178
int *len){
173
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
174
181
do {
175
*array = realloc(*array, sizeof(char *)
176
* (size_t) ((*len) + 2));
177
} while(*array == NULL and errno == EINTR);
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
178
185
/* Malloc check */
179
if(*array == NULL){
186
if(new_array == NULL){
180
187
return false;
181
188
}
189
*array = new_array;
182
190
/* Make a copy of the new string */
183
191
char *copy;
184
192
do {
196
204
}
197
205
198
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
199
208
static bool add_argument(plugin *p, const char *arg){
200
209
if(p == NULL){
201
210
return false;
204
213
}
205
214
206
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
207
217
static bool add_environment(plugin *p, const char *def, bool replace){
208
218
if(p == NULL){
209
219
return false;
211
221
/* namelen = length of name of environment variable */
212
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
213
223
/* Search for this environment variable */
214
for(char **e = p->environ; *e != NULL; e++){
215
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
216
226
/* It already exists */
217
227
if(replace){
218
char *new;
228
char *new_envdef;
219
229
do {
220
new = realloc(*e, strlen(def) + 1);
221
} while(new == NULL and errno == EINTR);
222
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
223
233
return false;
224
234
}
225
*e = new;
226
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
227
237
}
228
238
return true;
229
239
}
231
241
return add_to_char_array(def, &(p->environ), &(p->envc));
232
242
}
233
243
244
#ifndef O_CLOEXEC
234
245
/*
235
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
236
247
* Descriptor Flags".
237
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
238
249
*/
250
__attribute__((warn_unused_result))
239
251
static int set_cloexec_flag(int fd){
240
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
241
253
/* If reading the flags failed, return error indication now. */
246
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
247
259
ret | FD_CLOEXEC));
248
260
}
261
#endif /* not O_CLOEXEC */
249
262
250
263
251
264
/* Mark processes as completed when they exit, and save their exit
265
278
/* No child processes */
266
279
break;
267
280
}
268
perror("waitpid");
281
error(0, errno, "waitpid");
269
282
}
270
283
271
284
/* A child exited, find it in process_list */
283
296
}
284
297
285
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
286
300
static bool print_out_password(const char *buffer, size_t length){
287
301
ssize_t ret;
288
302
for(size_t written = 0; written < length; written += (size_t)ret){
296
310
}
297
311
298
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
299
314
static void free_plugin(plugin *plugin_node){
300
315
301
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
333
348
334
349
int main(int argc, char *argv[]){
335
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
336
352
char *argfile = NULL;
337
353
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
354
struct dirent **direntries = NULL;
341
355
struct stat st;
342
356
fd_set rfds_all;
343
357
int ret, maxfd = 0;
351
365
.sa_flags = SA_NOCLDSTOP };
352
366
char **custom_argv = NULL;
353
367
int custom_argc = 0;
368
int dir_fd = -1;
354
369
355
370
/* Establish a signal handler */
356
371
sigemptyset(&sigchld_action.sa_mask);
357
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
373
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
361
376
goto fallback;
362
377
}
363
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
379
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
367
382
goto fallback;
368
383
}
369
384
401
416
.doc = "Group ID the plugins will run as", .group = 3 },
402
417
{ .name = "debug", .key = 132,
403
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
404
423
/*
405
424
* These reproduce what we would get without ARGP_NO_HELP
406
425
*/
413
432
{ .name = NULL }
414
433
};
415
434
435
__attribute__((nonnull(3)))
416
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
437
errno = 0;
418
438
switch(key){
419
439
char *tmp;
420
intmax_t tmpmax;
440
intmax_t tmp_id;
421
441
case 'g': /* --global-options */
422
442
{
423
443
char *plugin_option;
426
446
break;
427
447
}
428
448
}
449
errno = 0;
429
450
}
430
451
break;
431
452
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
433
456
break;
434
457
case 'o': /* --options-for */
435
458
{
452
475
break;
453
476
}
454
477
}
478
errno = 0;
455
479
}
456
480
break;
457
481
case 'E': /* --env-for */
469
493
errno = EINVAL;
470
494
break;
471
495
}
472
add_environment(getplugin(arg), envdef, true);
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
473
499
}
474
500
break;
475
501
case 'd': /* --disable */
477
503
plugin *p = getplugin(arg);
478
504
if(p != NULL){
479
505
p->disabled = true;
506
errno = 0;
480
507
}
481
508
}
482
509
break;
485
512
plugin *p = getplugin(arg);
486
513
if(p != NULL){
487
514
p->disabled = false;
515
errno = 0;
488
516
}
489
517
}
490
518
break;
491
519
case 128: /* --plugin-dir */
492
520
free(plugindir);
493
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
494
525
break;
495
526
case 129: /* --config-file */
496
527
/* This is already done by parse_opt_config_file() */
497
528
break;
498
529
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
530
tmp_id = strtoimax(arg, &tmp, 10);
500
531
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
532
or tmp_id != (uid_t)tmp_id){
502
533
argp_error(state, "Bad user ID number: \"%s\", using %"
503
534
PRIdMAX, arg, (intmax_t)uid);
504
535
break;
505
536
}
506
uid = (uid_t)tmpmax;
537
uid = (uid_t)tmp_id;
538
errno = 0;
507
539
break;
508
540
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
541
tmp_id = strtoimax(arg, &tmp, 10);
510
542
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
543
or tmp_id != (gid_t)tmp_id){
512
544
argp_error(state, "Bad group ID number: \"%s\", using %"
513
545
PRIdMAX, arg, (intmax_t)gid);
514
546
break;
515
547
}
516
gid = (gid_t)tmpmax;
548
gid = (gid_t)tmp_id;
549
errno = 0;
517
550
break;
518
551
case 132: /* --debug */
519
552
debug = true;
520
553
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
521
561
/*
522
562
* These reproduce what we would get without ARGP_NO_HELP
523
563
*/
543
583
if(arg[0] == '\0'){
544
584
break;
545
585
}
586
/* FALLTHROUGH */
546
587
default:
547
588
return ARGP_ERR_UNKNOWN;
548
589
}
567
608
case 129: /* --config-file */
568
609
free(argfile);
569
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
570
614
break;
571
615
case 130: /* --userid */
572
616
case 131: /* --groupid */
573
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
574
619
case '?': /* --help */
575
620
case -3: /* --usage */
576
621
case 'V': /* --version */
598
643
case ENOMEM:
599
644
default:
600
645
errno = ret;
601
perror("argp_parse");
646
error(0, errno, "argp_parse");
602
647
exitstatus = EX_OSERR;
603
648
goto fallback;
604
649
case EINVAL:
625
670
custom_argc = 1;
626
671
custom_argv = malloc(sizeof(char*) * 2);
627
672
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
673
error(0, errno, "malloc");
674
exitstatus = EX_OSERR;
630
675
goto fallback;
631
676
}
632
677
custom_argv[0] = argv[0];
648
693
}
649
694
new_arg = strdup(p);
650
695
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
696
error(0, errno, "strdup");
697
exitstatus = EX_OSERR;
653
698
free(org_line);
654
699
goto fallback;
655
700
}
656
701
657
702
custom_argc += 1;
658
custom_argv = realloc(custom_argv, sizeof(char *)
659
* ((unsigned int) custom_argc + 1));
660
if(custom_argv == NULL){
661
perror("realloc");
662
exitstatus = EXIT_FAILURE;
663
free(org_line);
664
goto fallback;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
665
715
}
666
716
custom_argv[custom_argc-1] = new_arg;
667
717
custom_argv[custom_argc] = NULL;
671
721
ret = fclose(conffp);
672
722
} while(ret == EOF and errno == EINTR);
673
723
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
724
error(0, errno, "fclose");
725
exitstatus = EX_IOERR;
676
726
goto fallback;
677
727
}
678
728
free(org_line);
680
730
/* Check for harmful errors and go to fallback. Other errors might
681
731
not affect opening plugins */
682
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
733
error(0, errno, "fopen");
734
exitstatus = EX_OSERR;
685
735
goto fallback;
686
736
}
687
737
}
697
747
case ENOMEM:
698
748
default:
699
749
errno = ret;
700
perror("argp_parse");
750
error(0, errno, "argp_parse");
701
751
exitstatus = EX_OSERR;
702
752
goto fallback;
703
753
case EINVAL:
717
767
case ENOMEM:
718
768
default:
719
769
errno = ret;
720
perror("argp_parse");
770
error(0, errno, "argp_parse");
721
771
exitstatus = EX_OSERR;
722
772
goto fallback;
723
773
case EINVAL:
725
775
goto fallback;
726
776
}
727
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
794
}
795
728
796
if(debug){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
731
799
p->name ? p->name : "Global", p->argc - 1);
732
800
for(char **a = p->argv; *a != NULL; a++){
739
807
}
740
808
}
741
809
742
/* Strip permissions down to nobody */
743
setgid(gid);
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
744
836
if(ret == -1){
745
perror("setgid");
837
error(0, errno, "setgid");
746
838
}
747
839
ret = setuid(uid);
748
840
if(ret == -1){
749
perror("setuid");
841
error(0, errno, "setuid");
750
842
}
751
843
752
844
/* Open plugin directory with close_on_exec flag */
753
845
{
754
int dir_fd = -1;
755
if(plugindir == NULL){
756
dir_fd = open(PDIR, O_RDONLY |
757
#ifdef O_CLOEXEC
758
O_CLOEXEC
759
#else /* not O_CLOEXEC */
760
0
761
#endif /* not O_CLOEXEC */
762
);
763
} else {
764
dir_fd = open(plugindir, O_RDONLY |
765
#ifdef O_CLOEXEC
766
O_CLOEXEC
767
#else /* not O_CLOEXEC */
768
0
769
#endif /* not O_CLOEXEC */
770
);
771
}
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
772
853
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
854
error(0, errno, "Could not open plugin dir");
855
exitstatus = EX_UNAVAILABLE;
775
856
goto fallback;
776
857
}
777
858
779
860
/* Set the FD_CLOEXEC flag on the directory */
780
861
ret = set_cloexec_flag(dir_fd);
781
862
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
863
error(0, errno, "set_cloexec_flag");
864
exitstatus = EX_OSERR;
785
865
goto fallback;
786
866
}
787
867
#endif /* O_CLOEXEC */
788
789
dir = fdopendir(dir_fd);
790
if(dir == NULL){
791
perror("Could not open plugin dir");
792
TEMP_FAILURE_RETRY(close(dir_fd));
793
exitstatus = EXIT_FAILURE;
794
goto fallback;
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
890
}
795
891
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
796
902
}
797
903
798
904
FD_ZERO(&rfds_all);
799
905
800
906
/* Read and execute any executable in the plugin directory*/
801
while(true){
802
do {
803
dirst = readdir(dir);
804
} while(dirst == NULL and errno == EINTR);
805
806
/* All directory entries have been processed */
807
if(dirst == NULL){
808
if(errno == EBADF){
809
perror("readdir");
810
exitstatus = EXIT_FAILURE;
811
goto fallback;
812
}
813
break;
814
}
815
816
d_name_len = strlen(dirst->d_name);
817
818
/* Ignore dotfiles, backup files and other junk */
819
{
820
bool bad_name = false;
821
822
const char const *bad_prefixes[] = { ".", "#", NULL };
823
824
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
825
".dpkg-old",
826
".dpkg-bak",
827
".dpkg-divert", NULL };
828
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
829
size_t pre_len = strlen(*pre);
830
if((d_name_len >= pre_len)
831
and strncmp((dirst->d_name), *pre, pre_len) == 0){
832
if(debug){
833
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
834
" with bad prefix %s\n", dirst->d_name, *pre);
835
}
836
bad_name = true;
837
break;
838
}
839
}
840
if(bad_name){
841
continue;
842
}
843
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
844
size_t suf_len = strlen(*suf);
845
if((d_name_len >= suf_len)
846
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
847
== 0)){
848
if(debug){
849
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
850
" with bad suffix %s\n", dirst->d_name, *suf);
851
}
852
bad_name = true;
853
break;
854
}
855
}
856
857
if(bad_name){
858
continue;
859
}
860
}
861
862
char *filename;
863
if(plugindir == NULL){
864
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
865
dirst->d_name));
866
} else {
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
868
plugindir,
869
dirst->d_name));
870
}
871
if(ret < 0){
872
perror("asprintf");
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
873
913
continue;
874
914
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
916
if(ret == -1){
878
perror("stat");
879
free(filename);
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
880
920
continue;
881
921
}
882
922
883
923
/* Ignore non-executable files */
884
924
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
886
927
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
889
932
}
890
free(filename);
933
close(plugin_fd);
934
free(direntries[i]);
891
935
continue;
892
936
}
893
937
894
plugin *p = getplugin(dirst->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
895
939
if(p == NULL){
896
perror("getplugin");
897
free(filename);
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
898
943
continue;
899
944
}
900
945
if(p->disabled){
901
946
if(debug){
902
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
948
direntries[i]->d_name);
904
949
}
905
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
906
952
continue;
907
953
}
908
954
{
911
957
if(g != NULL){
912
958
for(char **a = g->argv + 1; *a != NULL; a++){
913
959
if(not add_argument(p, *a)){
914
perror("add_argument");
960
error(0, errno, "add_argument");
915
961
}
916
962
}
917
963
/* Add global environment variables */
918
964
for(char **e = g->environ; *e != NULL; e++){
919
965
if(not add_environment(p, *e, false)){
920
perror("add_environment");
966
error(0, errno, "add_environment");
921
967
}
922
968
}
923
969
}
924
970
}
925
/* If this plugin has any environment variables, we will call
926
using execve and need to duplicate the environment from this
927
process, too. */
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
928
973
if(p->environ[0] != NULL){
929
974
for(char **e = environ; *e != NULL; e++){
930
975
if(not add_environment(p, *e, false)){
931
perror("add_environment");
976
error(0, errno, "add_environment");
932
977
}
933
978
}
934
979
}
935
980
936
981
int pipefd[2];
982
#ifndef O_CLOEXEC
937
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
938
987
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
943
1003
/* Ask OS to automatic close the pipe on exec */
944
1004
ret = set_cloexec_flag(pipefd[0]);
945
1005
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
948
1011
goto fallback;
949
1012
}
950
1013
ret = set_cloexec_flag(pipefd[1]);
951
1014
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
954
1020
goto fallback;
955
1021
}
1022
#endif /* not O_CLOEXEC */
956
1023
/* Block SIGCHLD until process is safely in process list */
957
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1025
&sigchld_action.sa_mask,
959
1026
NULL));
960
1027
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1028
error(0, errno, "sigprocmask");
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
963
1031
goto fallback;
964
1032
}
965
1033
/* Starting a new process to be watched */
968
1036
pid = fork();
969
1037
} while(pid == -1 and errno == EINTR);
970
1038
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
973
1046
goto fallback;
974
1047
}
975
1048
if(pid == 0){
976
1049
/* this is the child process */
977
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1051
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
981
1054
}
982
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1056
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
986
1059
}
987
1060
988
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1062
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
992
1065
}
993
1066
994
if(dirfd(dir) < 0){
995
/* If dir has no file descriptor, we could not set FD_CLOEXEC
996
above and must now close it manually here. */
997
closedir(dir);
998
}
999
if(p->environ[0] == NULL){
1000
if(execv(filename, p->argv) < 0){
1001
perror("execv");
1002
_exit(EXIT_FAILURE);
1003
}
1004
} else {
1005
if(execve(filename, p->argv, p->environ) < 0){
1006
perror("execve");
1007
_exit(EXIT_FAILURE);
1008
}
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
1009
1073
}
1010
1074
/* no return */
1011
1075
}
1012
1076
/* Parent process */
1013
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1014
pipe */
1015
free(filename);
1016
plugin *new_plugin = getplugin(dirst->d_name);
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1080
if(new_plugin == NULL){
1018
perror("getplugin");
1081
error(0, errno, "getplugin");
1019
1082
ret = (int)(TEMP_FAILURE_RETRY
1020
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1084
NULL)));
1022
1085
if(ret < 0){
1023
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
1024
1087
}
1025
exitstatus = EXIT_FAILURE;
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1026
1090
goto fallback;
1027
1091
}
1092
free(direntries[i]);
1028
1093
1029
1094
new_plugin->pid = pid;
1030
1095
new_plugin->fd = pipefd[0];
1031
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
1032
1102
/* Unblock SIGCHLD so signal handler can be run if this process
1033
1103
has already completed */
1034
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
1105
&sigchld_action.sa_mask,
1036
1106
NULL));
1037
1107
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1108
error(0, errno, "sigprocmask");
1109
exitstatus = EX_OSERR;
1040
1110
goto fallback;
1041
1111
}
1042
1112
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1113
FD_SET(new_plugin->fd, &rfds_all);
1045
1114
1046
1115
if(maxfd < new_plugin->fd){
1047
1116
maxfd = new_plugin->fd;
1048
1117
}
1049
1118
}
1050
1119
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1053
1124
free_plugin(getplugin(NULL));
1054
1125
1055
1126
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1139
fd_set rfds = rfds_all;
1069
1140
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1141
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1142
error(0, errno, "select");
1143
exitstatus = EX_OSERR;
1073
1144
goto fallback;
1074
1145
}
1075
1146
/* OK, now either a process completed, or something can be read
1094
1165
(intmax_t) (proc->pid),
1095
1166
WTERMSIG(proc->status),
1096
1167
strsignal(WTERMSIG(proc->status)));
1097
} else if(WCOREDUMP(proc->status)){
1098
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1099
" core\n", proc->name, (intmax_t) (proc->pid));
1100
1168
}
1101
1169
}
1102
1170
1103
1171
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1172
FD_CLR(proc->fd, &rfds_all);
1106
1173
1107
1174
/* Block signal while modifying process_list */
1108
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1177
&sigchld_action.sa_mask,
1111
1178
NULL));
1112
1179
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1180
error(0, errno, "sigprocmask");
1181
exitstatus = EX_OSERR;
1115
1182
goto fallback;
1116
1183
}
1117
1184
1124
1191
(sigprocmask(SIG_UNBLOCK,
1125
1192
&sigchld_action.sa_mask, NULL)));
1126
1193
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1194
error(0, errno, "sigprocmask");
1195
exitstatus = EX_OSERR;
1129
1196
goto fallback;
1130
1197
}
1131
1198
1141
1208
bool bret = print_out_password(proc->buffer,
1142
1209
proc->buffer_length);
1143
1210
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1211
error(0, errno, "print_out_password");
1212
exitstatus = EX_IOERR;
1146
1213
}
1147
1214
goto fallback;
1148
1215
}
1149
1216
1150
1217
/* This process has not completed. Does it have any output? */
1151
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1152
warning from
1153
-Wconversion */
1218
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1219
/* This process had nothing to say at this time */
1155
1220
proc = proc->next;
1156
1221
continue;
1157
1222
}
1158
1223
/* Before reading, make the process' data buffer large enough */
1159
1224
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1160
proc->buffer = realloc(proc->buffer, proc->buffer_size
1161
+ (size_t) BUFFER_SIZE);
1162
if(proc->buffer == NULL){
1163
perror("malloc");
1164
exitstatus = EXIT_FAILURE;
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1229
exitstatus = EX_OSERR;
1165
1230
goto fallback;
1166
1231
}
1232
proc->buffer = new_buffer;
1167
1233
proc->buffer_size += BUFFER_SIZE;
1168
1234
}
1169
1235
/* Read from the process */
1188
1254
1189
1255
fallback:
1190
1256
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1257
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1258
and exitstatus != EX_OK)){
1192
1259
/* Fallback if all plugins failed, none are found or an error
1193
1260
occured */
1194
1261
bool bret;
1202
1269
}
1203
1270
bret = print_out_password(passwordbuffer, len);
1204
1271
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1272
error(0, errno, "print_out_password");
1273
exitstatus = EX_IOERR;
1207
1274
}
1208
1275
}
1209
1276
1210
1277
/* Restore old signal handler */
1211
1278
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1279
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1280
error(0, errno, "sigaction");
1281
exitstatus = EX_OSERR;
1215
1282
}
1216
1283
1217
1284
if(custom_argv != NULL){
1221
1288
free(custom_argv);
1222
1289
}
1223
1290
1224
if(dir != NULL){
1225
closedir(dir);
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
1226
1295
}
1227
1296
1228
1297
/* Kill the processes */
1232
1301
ret = kill(p->pid, SIGTERM);
1233
1302
if(ret == -1 and errno != ESRCH){
1234
1303
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1304
error(0, errno, "kill");
1236
1305
}
1237
1306
}
1238
1307
}
1242
1311
ret = wait(NULL);
1243
1312
} while(ret >= 0);
1244
1313
if(errno != ECHILD){
1245
perror("wait");
1314
error(0, errno, "wait");
1246
1315
}
1247
1316
1248
1317
free_plugin_list();
1249
1318
1250
1319
free(plugindir);
1320
free(pluginhelperdir);
1251
1321
free(argfile);
1252
1322
1253
1323
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0