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- Committer: Teddy Hogeborn
- Date: 2009-11-03 00:12:35 UTC
- Revision ID: teddy@fukt.bsnet.se-20091103001235-op9jfvtx6xvxch3h
* README (FAQ): Fix typo.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
* mandos (main): Try to always do cleanup() before exit, since
otherwise the D-Bus bus name gets unregistered first.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
asprintf(), O_CLOEXEC */
28
27
#include <stddef.h> /* size_t, NULL */
29
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
29
realloc() */
31
30
#include <stdbool.h> /* bool, true, false */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
34
stat, waitpid(), WIFEXITED(),
35
WEXITSTATUS(), wait(), pid_t,
36
uid_t, gid_t, getuid(), getgid(),
37
dirfd() */
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
44
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
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() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
57
58
#include <errno.h> /* errno */
58
59
#include <argp.h> /* struct argp_option, struct
59
60
argp_state, struct argp,
69
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
73
76
74
#define BUFFER_SIZE 256
77
75
78
76
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
78
82
79
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
84
81
85
82
typedef struct plugin{
86
83
char *name; /* can be NULL or any plugin name */
106
103
107
104
/* Gets an existing plugin based on name,
108
105
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
106
static plugin *getplugin(char *name){
111
107
/* Check for existing plugin with that name */
112
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
173
169
}
174
170
175
171
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
172
static bool add_to_char_array(const char *new, char ***array,
178
173
int *len){
179
174
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
175
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
185
179
/* Malloc check */
186
if(new_array == NULL){
180
if(*array == NULL){
187
181
return false;
188
182
}
189
*array = new_array;
190
183
/* Make a copy of the new string */
191
184
char *copy;
192
185
do {
204
197
}
205
198
206
199
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
200
static bool add_argument(plugin *p, const char *arg){
209
201
if(p == NULL){
210
202
return false;
213
205
}
214
206
215
207
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
208
static bool add_environment(plugin *p, const char *def, bool replace){
218
209
if(p == NULL){
219
210
return false;
221
212
/* namelen = length of name of environment variable */
222
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
214
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
226
217
/* It already exists */
227
218
if(replace){
228
char *new_envdef;
219
char *new;
229
220
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
233
224
return false;
234
225
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
226
*e = new;
227
strcpy(*e, def);
237
228
}
238
229
return true;
239
230
}
241
232
return add_to_char_array(def, &(p->environ), &(p->envc));
242
233
}
243
234
244
#ifndef O_CLOEXEC
245
235
/*
246
236
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
237
* Descriptor Flags".
248
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
249
239
*/
250
__attribute__((warn_unused_result))
251
240
static int set_cloexec_flag(int fd){
252
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
253
242
/* If reading the flags failed, return error indication now. */
258
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
248
ret | FD_CLOEXEC));
260
249
}
261
#endif /* not O_CLOEXEC */
262
250
263
251
264
252
/* Mark processes as completed when they exit, and save their exit
278
266
/* No child processes */
279
267
break;
280
268
}
281
error(0, errno, "waitpid");
269
perror("waitpid");
282
270
}
283
271
284
272
/* A child exited, find it in process_list */
296
284
}
297
285
298
286
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
287
static bool print_out_password(const char *buffer, size_t length){
301
288
ssize_t ret;
302
289
for(size_t written = 0; written < length; written += (size_t)ret){
310
297
}
311
298
312
299
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
300
static void free_plugin(plugin *plugin_node){
315
301
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
317
303
free(*arg);
318
304
}
319
free(plugin_node->name);
320
305
free(plugin_node->argv);
321
306
for(char **env = plugin_node->environ; *env != NULL; env++){
322
307
free(*env);
349
334
350
335
int main(int argc, char *argv[]){
351
336
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
337
char *argfile = NULL;
354
338
FILE *conffp;
355
struct dirent **direntries = NULL;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
356
342
struct stat st;
357
343
fd_set rfds_all;
358
344
int ret, maxfd = 0;
366
352
.sa_flags = SA_NOCLDSTOP };
367
353
char **custom_argv = NULL;
368
354
int custom_argc = 0;
369
int dir_fd = -1;
370
355
371
356
/* Establish a signal handler */
372
357
sigemptyset(&sigchld_action.sa_mask);
373
358
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
359
if(ret == -1){
375
error(0, errno, "sigaddset");
360
perror("sigaddset");
376
361
exitstatus = EX_OSERR;
377
362
goto fallback;
378
363
}
379
364
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
365
if(ret == -1){
381
error(0, errno, "sigaction");
366
perror("sigaction");
382
367
exitstatus = EX_OSERR;
383
368
goto fallback;
384
369
}
417
402
.doc = "Group ID the plugins will run as", .group = 3 },
418
403
{ .name = "debug", .key = 132,
419
404
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
405
/*
425
406
* These reproduce what we would get without ARGP_NO_HELP
426
407
*/
433
414
{ .name = NULL }
434
415
};
435
416
436
__attribute__((nonnull(3)))
437
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
418
errno = 0;
439
419
switch(key){
440
420
char *tmp;
441
intmax_t tmp_id;
421
intmax_t tmpmax;
442
422
case 'g': /* --global-options */
443
423
{
444
424
char *plugin_option;
447
427
break;
448
428
}
449
429
}
450
errno = 0;
451
430
}
452
431
break;
453
432
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
433
add_environment(getplugin(NULL), arg, true);
457
434
break;
458
435
case 'o': /* --options-for */
459
436
{
476
453
break;
477
454
}
478
455
}
479
errno = 0;
480
456
}
481
457
break;
482
458
case 'E': /* --env-for */
494
470
errno = EINVAL;
495
471
break;
496
472
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
473
add_environment(getplugin(arg), envdef, true);
500
474
}
501
475
break;
502
476
case 'd': /* --disable */
504
478
plugin *p = getplugin(arg);
505
479
if(p != NULL){
506
480
p->disabled = true;
507
errno = 0;
508
481
}
509
482
}
510
483
break;
513
486
plugin *p = getplugin(arg);
514
487
if(p != NULL){
515
488
p->disabled = false;
516
errno = 0;
517
489
}
518
490
}
519
491
break;
520
492
case 128: /* --plugin-dir */
521
493
free(plugindir);
522
494
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
495
break;
527
496
case 129: /* --config-file */
528
497
/* This is already done by parse_opt_config_file() */
529
498
break;
530
499
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
500
tmpmax = strtoimax(arg, &tmp, 10);
532
501
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
502
or tmpmax != (uid_t)tmpmax){
534
503
argp_error(state, "Bad user ID number: \"%s\", using %"
535
504
PRIdMAX, arg, (intmax_t)uid);
536
505
break;
537
506
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
507
uid = (uid_t)tmpmax;
540
508
break;
541
509
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
510
tmpmax = strtoimax(arg, &tmp, 10);
543
511
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
512
or tmpmax != (gid_t)tmpmax){
545
513
argp_error(state, "Bad group ID number: \"%s\", using %"
546
514
PRIdMAX, arg, (intmax_t)gid);
547
515
break;
548
516
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
517
gid = (gid_t)tmpmax;
551
518
break;
552
519
case 132: /* --debug */
553
520
debug = true;
554
521
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
522
/*
563
523
* These reproduce what we would get without ARGP_NO_HELP
564
524
*/
565
525
case '?': /* --help */
566
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
528
case -3: /* --usage */
570
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
530
argp_state_help(state, state->out_stream,
572
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
532
case 'V': /* --version */
575
533
fprintf(state->out_stream, "%s\n", argp_program_version);
576
534
exit(EXIT_SUCCESS);
586
544
if(arg[0] == '\0'){
587
545
break;
588
546
}
589
/* FALLTHROUGH */
590
547
default:
591
548
return ARGP_ERR_UNKNOWN;
592
549
}
611
568
case 129: /* --config-file */
612
569
free(argfile);
613
570
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
616
}
617
571
break;
618
572
case 130: /* --userid */
619
573
case 131: /* --groupid */
620
574
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
575
case '?': /* --help */
623
576
case -3: /* --usage */
624
577
case 'V': /* --version */
646
599
case ENOMEM:
647
600
default:
648
601
errno = ret;
649
error(0, errno, "argp_parse");
602
perror("argp_parse");
650
603
exitstatus = EX_OSERR;
651
604
goto fallback;
652
605
case EINVAL:
673
626
custom_argc = 1;
674
627
custom_argv = malloc(sizeof(char*) * 2);
675
628
if(custom_argv == NULL){
676
error(0, errno, "malloc");
629
perror("malloc");
677
630
exitstatus = EX_OSERR;
678
631
goto fallback;
679
632
}
696
649
}
697
650
new_arg = strdup(p);
698
651
if(new_arg == NULL){
699
error(0, errno, "strdup");
652
perror("strdup");
700
653
exitstatus = EX_OSERR;
701
654
free(org_line);
702
655
goto fallback;
703
656
}
704
657
705
658
custom_argc += 1;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
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;
718
666
}
719
667
custom_argv[custom_argc-1] = new_arg;
720
668
custom_argv[custom_argc] = NULL;
724
672
ret = fclose(conffp);
725
673
} while(ret == EOF and errno == EINTR);
726
674
if(ret == EOF){
727
error(0, errno, "fclose");
675
perror("fclose");
728
676
exitstatus = EX_IOERR;
729
677
goto fallback;
730
678
}
733
681
/* Check for harmful errors and go to fallback. Other errors might
734
682
not affect opening plugins */
735
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
684
perror("fopen");
685
exitstatus = EX_IOERR;
738
686
goto fallback;
739
687
}
740
688
}
750
698
case ENOMEM:
751
699
default:
752
700
errno = ret;
753
error(0, errno, "argp_parse");
701
perror("argp_parse");
754
702
exitstatus = EX_OSERR;
755
703
goto fallback;
756
704
case EINVAL:
770
718
case ENOMEM:
771
719
default:
772
720
errno = ret;
773
error(0, errno, "argp_parse");
721
perror("argp_parse");
774
722
exitstatus = EX_OSERR;
775
723
goto fallback;
776
724
case EINVAL:
778
726
goto fallback;
779
727
}
780
728
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
796
}
797
}
798
799
729
if(debug){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
801
731
fprintf(stderr, "Plugin: %s has %d arguments\n",
802
732
p->name ? p->name : "Global", p->argc - 1);
803
733
for(char **a = p->argv; *a != NULL; a++){
810
740
}
811
741
}
812
742
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
743
/* Strip permissions down to nobody */
744
setgid(gid);
839
745
if(ret == -1){
840
error(0, errno, "setgid");
746
perror("setgid");
841
747
}
842
748
ret = setuid(uid);
843
749
if(ret == -1){
844
error(0, errno, "setuid");
750
perror("setuid");
845
751
}
846
752
847
753
/* Open plugin directory with close_on_exec flag */
848
754
{
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
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
}
856
773
if(dir_fd == -1){
857
error(0, errno, "Could not open plugin dir");
774
perror("Could not open plugin dir");
858
775
exitstatus = EX_UNAVAILABLE;
859
776
goto fallback;
860
777
}
863
780
/* Set the FD_CLOEXEC flag on the directory */
864
781
ret = set_cloexec_flag(dir_fd);
865
782
if(ret < 0){
866
error(0, errno, "set_cloexec_flag");
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
867
785
exitstatus = EX_OSERR;
868
786
goto fallback;
869
787
}
870
788
#endif /* O_CLOEXEC */
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
return 0;
893
}
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;
894
796
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
905
797
}
906
798
907
799
FD_ZERO(&rfds_all);
908
800
909
801
/* Read and execute any executable in the plugin directory*/
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
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");
916
874
continue;
917
875
}
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
919
878
if(ret == -1){
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
879
perror("stat");
880
free(filename);
923
881
continue;
924
882
}
925
883
926
884
/* Ignore non-executable files */
927
885
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
930
887
if(debug){
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
935
890
}
936
close(plugin_fd);
937
free(direntries[i]);
891
free(filename);
938
892
continue;
939
893
}
940
894
941
plugin *p = getplugin(direntries[i]->d_name);
895
plugin *p = getplugin(dirst->d_name);
942
896
if(p == NULL){
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
897
perror("getplugin");
898
free(filename);
946
899
continue;
947
900
}
948
901
if(p->disabled){
949
902
if(debug){
950
903
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
951
direntries[i]->d_name);
904
dirst->d_name);
952
905
}
953
close(plugin_fd);
954
free(direntries[i]);
906
free(filename);
955
907
continue;
956
908
}
957
909
{
960
912
if(g != NULL){
961
913
for(char **a = g->argv + 1; *a != NULL; a++){
962
914
if(not add_argument(p, *a)){
963
error(0, errno, "add_argument");
915
perror("add_argument");
964
916
}
965
917
}
966
918
/* Add global environment variables */
967
919
for(char **e = g->environ; *e != NULL; e++){
968
920
if(not add_environment(p, *e, false)){
969
error(0, errno, "add_environment");
921
perror("add_environment");
970
922
}
971
923
}
972
924
}
973
925
}
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
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. */
976
929
if(p->environ[0] != NULL){
977
930
for(char **e = environ; *e != NULL; e++){
978
931
if(not add_environment(p, *e, false)){
979
error(0, errno, "add_environment");
932
perror("add_environment");
980
933
}
981
934
}
982
935
}
983
936
984
937
int pipefd[2];
985
#ifndef O_CLOEXEC
986
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
990
939
if(ret == -1){
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
1006
944
/* Ask OS to automatic close the pipe on exec */
1007
945
ret = set_cloexec_flag(pipefd[0]);
1008
946
if(ret < 0){
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
947
perror("set_cloexec_flag");
1012
948
exitstatus = EX_OSERR;
1013
free(direntries[i]);
1014
949
goto fallback;
1015
950
}
1016
951
ret = set_cloexec_flag(pipefd[1]);
1017
952
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
953
perror("set_cloexec_flag");
1021
954
exitstatus = EX_OSERR;
1022
free(direntries[i]);
1023
955
goto fallback;
1024
956
}
1025
#endif /* not O_CLOEXEC */
1026
957
/* Block SIGCHLD until process is safely in process list */
1027
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
959
&sigchld_action.sa_mask,
1029
960
NULL));
1030
961
if(ret < 0){
1031
error(0, errno, "sigprocmask");
962
perror("sigprocmask");
1032
963
exitstatus = EX_OSERR;
1033
free(direntries[i]);
1034
964
goto fallback;
1035
965
}
1036
966
/* Starting a new process to be watched */
1039
969
pid = fork();
1040
970
} while(pid == -1 and errno == EINTR);
1041
971
if(pid == -1){
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
972
perror("fork");
1047
973
exitstatus = EX_OSERR;
1048
free(direntries[i]);
1049
974
goto fallback;
1050
975
}
1051
976
if(pid == 0){
1052
977
/* this is the child process */
1053
978
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1054
979
if(ret < 0){
1055
error(0, errno, "sigaction");
980
perror("sigaction");
1056
981
_exit(EX_OSERR);
1057
982
}
1058
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
984
if(ret < 0){
1060
error(0, errno, "sigprocmask");
985
perror("sigprocmask");
1061
986
_exit(EX_OSERR);
1062
987
}
1063
988
1064
989
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
990
if(ret == -1){
1066
error(0, errno, "dup2");
991
perror("dup2");
1067
992
_exit(EX_OSERR);
1068
993
}
1069
994
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_exit(EX_OSERR);
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
}
1076
1010
}
1077
1011
/* no return */
1078
1012
}
1079
1013
/* Parent process */
1080
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
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);
1083
1018
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1019
perror("getplugin");
1085
1020
ret = (int)(TEMP_FAILURE_RETRY
1086
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1087
1022
NULL)));
1088
1023
if(ret < 0){
1089
error(0, errno, "sigprocmask");
1024
perror("sigprocmask");
1090
1025
}
1091
1026
exitstatus = EX_OSERR;
1092
free(direntries[i]);
1093
1027
goto fallback;
1094
1028
}
1095
free(direntries[i]);
1096
1029
1097
1030
new_plugin->pid = pid;
1098
1031
new_plugin->fd = pipefd[0];
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
1032
1105
1033
/* Unblock SIGCHLD so signal handler can be run if this process
1106
1034
has already completed */
1107
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
1036
&sigchld_action.sa_mask,
1109
1037
NULL));
1110
1038
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1039
perror("sigprocmask");
1112
1040
exitstatus = EX_OSERR;
1113
1041
goto fallback;
1114
1042
}
1115
1043
1116
FD_SET(new_plugin->fd, &rfds_all);
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1117
1046
1118
1047
if(maxfd < new_plugin->fd){
1119
1048
maxfd = new_plugin->fd;
1120
1049
}
1121
1050
}
1122
1051
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1127
1054
free_plugin(getplugin(NULL));
1128
1055
1129
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1142
1069
fd_set rfds = rfds_all;
1143
1070
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1144
1071
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1072
perror("select");
1146
1073
exitstatus = EX_OSERR;
1147
1074
goto fallback;
1148
1075
}
1168
1095
(intmax_t) (proc->pid),
1169
1096
WTERMSIG(proc->status),
1170
1097
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));
1171
1101
}
1172
1102
}
1173
1103
1174
1104
/* Remove the plugin */
1175
FD_CLR(proc->fd, &rfds_all);
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1176
1107
1177
1108
/* Block signal while modifying process_list */
1178
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1180
1111
&sigchld_action.sa_mask,
1181
1112
NULL));
1182
1113
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1114
perror("sigprocmask");
1184
1115
exitstatus = EX_OSERR;
1185
1116
goto fallback;
1186
1117
}
1194
1125
(sigprocmask(SIG_UNBLOCK,
1195
1126
&sigchld_action.sa_mask, NULL)));
1196
1127
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1128
perror("sigprocmask");
1198
1129
exitstatus = EX_OSERR;
1199
1130
goto fallback;
1200
1131
}
1211
1142
bool bret = print_out_password(proc->buffer,
1212
1143
proc->buffer_length);
1213
1144
if(not bret){
1214
error(0, errno, "print_out_password");
1145
perror("print_out_password");
1215
1146
exitstatus = EX_IOERR;
1216
1147
}
1217
1148
goto fallback;
1218
1149
}
1219
1150
1220
1151
/* This process has not completed. Does it have any output? */
1221
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1222
1155
/* This process had nothing to say at this time */
1223
1156
proc = proc->next;
1224
1157
continue;
1225
1158
}
1226
1159
/* Before reading, make the process' data buffer large enough */
1227
1160
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1232
1165
exitstatus = EX_OSERR;
1233
1166
goto fallback;
1234
1167
}
1235
proc->buffer = new_buffer;
1236
1168
proc->buffer_size += BUFFER_SIZE;
1237
1169
}
1238
1170
/* Read from the process */
1272
1204
}
1273
1205
bret = print_out_password(passwordbuffer, len);
1274
1206
if(not bret){
1275
error(0, errno, "print_out_password");
1207
perror("print_out_password");
1276
1208
exitstatus = EX_IOERR;
1277
1209
}
1278
1210
}
1280
1212
/* Restore old signal handler */
1281
1213
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
1214
if(ret == -1){
1283
error(0, errno, "sigaction");
1215
perror("sigaction");
1284
1216
exitstatus = EX_OSERR;
1285
1217
}
1286
1218
1291
1223
free(custom_argv);
1292
1224
}
1293
1225
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1226
if(dir != NULL){
1227
closedir(dir);
1298
1228
}
1299
1229
1300
1230
/* Kill the processes */
1304
1234
ret = kill(p->pid, SIGTERM);
1305
1235
if(ret == -1 and errno != ESRCH){
1306
1236
/* Set-uid proccesses might not get closed */
1307
error(0, errno, "kill");
1237
perror("kill");
1308
1238
}
1309
1239
}
1310
1240
}
1314
1244
ret = wait(NULL);
1315
1245
} while(ret >= 0);
1316
1246
if(errno != ECHILD){
1317
error(0, errno, "wait");
1247
perror("wait");
1318
1248
}
1319
1249
1320
1250
free_plugin_list();
1321
1251
1322
1252
free(plugindir);
1323
free(pluginhelperdir);
1324
1253
free(argfile);
1325
1254
1326
1255
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0