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- Committer: Teddy Hogeborn
- Date: 2019-04-09 19:41:53 UTC
- mfrom: (1099 trunk)
- mto: This revision was merged to the branch mainline in revision 1100.
- Revision ID: teddy@recompile.se-20190409194153-khftfvj3ee27md1a
Merge from trunk
- 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
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
302
317
free(*arg);
303
318
}
319
free(plugin_node->name);
304
320
free(plugin_node->argv);
305
321
for(char **env = plugin_node->environ; *env != NULL; env++){
306
322
free(*env);
333
349
334
350
int main(int argc, char *argv[]){
335
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
336
353
char *argfile = NULL;
337
354
FILE *conffp;
338
size_t d_name_len;
339
DIR *dir = NULL;
340
struct dirent *dirst;
355
struct dirent **direntries = NULL;
341
356
struct stat st;
342
357
fd_set rfds_all;
343
358
int ret, maxfd = 0;
351
366
.sa_flags = SA_NOCLDSTOP };
352
367
char **custom_argv = NULL;
353
368
int custom_argc = 0;
369
int dir_fd = -1;
354
370
355
371
/* Establish a signal handler */
356
372
sigemptyset(&sigchld_action.sa_mask);
357
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
358
374
if(ret == -1){
359
perror("sigaddset");
360
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
361
377
goto fallback;
362
378
}
363
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
364
380
if(ret == -1){
365
perror("sigaction");
366
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
367
383
goto fallback;
368
384
}
369
385
401
417
.doc = "Group ID the plugins will run as", .group = 3 },
402
418
{ .name = "debug", .key = 132,
403
419
.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 },
404
424
/*
405
425
* These reproduce what we would get without ARGP_NO_HELP
406
426
*/
413
433
{ .name = NULL }
414
434
};
415
435
436
__attribute__((nonnull(3)))
416
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
417
438
errno = 0;
418
439
switch(key){
419
440
char *tmp;
420
intmax_t tmpmax;
441
intmax_t tmp_id;
421
442
case 'g': /* --global-options */
422
443
{
423
444
char *plugin_option;
426
447
break;
427
448
}
428
449
}
450
errno = 0;
429
451
}
430
452
break;
431
453
case 'G': /* --global-env */
432
add_environment(getplugin(NULL), arg, true);
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
433
457
break;
434
458
case 'o': /* --options-for */
435
459
{
452
476
break;
453
477
}
454
478
}
479
errno = 0;
455
480
}
456
481
break;
457
482
case 'E': /* --env-for */
469
494
errno = EINVAL;
470
495
break;
471
496
}
472
add_environment(getplugin(arg), envdef, true);
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
473
500
}
474
501
break;
475
502
case 'd': /* --disable */
477
504
plugin *p = getplugin(arg);
478
505
if(p != NULL){
479
506
p->disabled = true;
507
errno = 0;
480
508
}
481
509
}
482
510
break;
485
513
plugin *p = getplugin(arg);
486
514
if(p != NULL){
487
515
p->disabled = false;
516
errno = 0;
488
517
}
489
518
}
490
519
break;
491
520
case 128: /* --plugin-dir */
492
521
free(plugindir);
493
522
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
494
526
break;
495
527
case 129: /* --config-file */
496
528
/* This is already done by parse_opt_config_file() */
497
529
break;
498
530
case 130: /* --userid */
499
tmpmax = strtoimax(arg, &tmp, 10);
531
tmp_id = strtoimax(arg, &tmp, 10);
500
532
if(errno != 0 or tmp == arg or *tmp != '\0'
501
or tmpmax != (uid_t)tmpmax){
533
or tmp_id != (uid_t)tmp_id){
502
534
argp_error(state, "Bad user ID number: \"%s\", using %"
503
535
PRIdMAX, arg, (intmax_t)uid);
504
536
break;
505
537
}
506
uid = (uid_t)tmpmax;
538
uid = (uid_t)tmp_id;
539
errno = 0;
507
540
break;
508
541
case 131: /* --groupid */
509
tmpmax = strtoimax(arg, &tmp, 10);
542
tmp_id = strtoimax(arg, &tmp, 10);
510
543
if(errno != 0 or tmp == arg or *tmp != '\0'
511
or tmpmax != (gid_t)tmpmax){
544
or tmp_id != (gid_t)tmp_id){
512
545
argp_error(state, "Bad group ID number: \"%s\", using %"
513
546
PRIdMAX, arg, (intmax_t)gid);
514
547
break;
515
548
}
516
gid = (gid_t)tmpmax;
549
gid = (gid_t)tmp_id;
550
errno = 0;
517
551
break;
518
552
case 132: /* --debug */
519
553
debug = true;
520
554
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
521
562
/*
522
563
* These reproduce what we would get without ARGP_NO_HELP
523
564
*/
524
565
case '?': /* --help */
525
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
526
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
527
569
case -3: /* --usage */
528
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
571
argp_state_help(state, state->out_stream,
530
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
531
574
case 'V': /* --version */
532
575
fprintf(state->out_stream, "%s\n", argp_program_version);
533
576
exit(EXIT_SUCCESS);
543
586
if(arg[0] == '\0'){
544
587
break;
545
588
}
589
/* FALLTHROUGH */
546
590
default:
547
591
return ARGP_ERR_UNKNOWN;
548
592
}
567
611
case 129: /* --config-file */
568
612
free(argfile);
569
613
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
616
}
570
617
break;
571
618
case 130: /* --userid */
572
619
case 131: /* --groupid */
573
620
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
574
622
case '?': /* --help */
575
623
case -3: /* --usage */
576
624
case 'V': /* --version */
598
646
case ENOMEM:
599
647
default:
600
648
errno = ret;
601
perror("argp_parse");
649
error(0, errno, "argp_parse");
602
650
exitstatus = EX_OSERR;
603
651
goto fallback;
604
652
case EINVAL:
625
673
custom_argc = 1;
626
674
custom_argv = malloc(sizeof(char*) * 2);
627
675
if(custom_argv == NULL){
628
perror("malloc");
629
exitstatus = EXIT_FAILURE;
676
error(0, errno, "malloc");
677
exitstatus = EX_OSERR;
630
678
goto fallback;
631
679
}
632
680
custom_argv[0] = argv[0];
648
696
}
649
697
new_arg = strdup(p);
650
698
if(new_arg == NULL){
651
perror("strdup");
652
exitstatus = EXIT_FAILURE;
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
653
701
free(org_line);
654
702
goto fallback;
655
703
}
656
704
657
705
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;
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
}
665
718
}
666
719
custom_argv[custom_argc-1] = new_arg;
667
720
custom_argv[custom_argc] = NULL;
671
724
ret = fclose(conffp);
672
725
} while(ret == EOF and errno == EINTR);
673
726
if(ret == EOF){
674
perror("fclose");
675
exitstatus = EXIT_FAILURE;
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
676
729
goto fallback;
677
730
}
678
731
free(org_line);
680
733
/* Check for harmful errors and go to fallback. Other errors might
681
734
not affect opening plugins */
682
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
683
perror("fopen");
684
exitstatus = EXIT_FAILURE;
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
685
738
goto fallback;
686
739
}
687
740
}
697
750
case ENOMEM:
698
751
default:
699
752
errno = ret;
700
perror("argp_parse");
753
error(0, errno, "argp_parse");
701
754
exitstatus = EX_OSERR;
702
755
goto fallback;
703
756
case EINVAL:
717
770
case ENOMEM:
718
771
default:
719
772
errno = ret;
720
perror("argp_parse");
773
error(0, errno, "argp_parse");
721
774
exitstatus = EX_OSERR;
722
775
goto fallback;
723
776
case EINVAL:
725
778
goto fallback;
726
779
}
727
780
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
728
799
if(debug){
729
for(plugin *p = plugin_list; p != NULL; p=p->next){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
730
801
fprintf(stderr, "Plugin: %s has %d arguments\n",
731
802
p->name ? p->name : "Global", p->argc - 1);
732
803
for(char **a = p->argv; *a != NULL; a++){
739
810
}
740
811
}
741
812
742
/* Strip permissions down to nobody */
743
setgid(gid);
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);
744
839
if(ret == -1){
745
perror("setgid");
840
error(0, errno, "setgid");
746
841
}
747
842
ret = setuid(uid);
748
843
if(ret == -1){
749
perror("setuid");
844
error(0, errno, "setuid");
750
845
}
751
846
752
847
/* Open plugin directory with close_on_exec flag */
753
848
{
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
}
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
);
772
856
if(dir_fd == -1){
773
perror("Could not open plugin dir");
774
exitstatus = EXIT_FAILURE;
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
775
859
goto fallback;
776
860
}
777
861
779
863
/* Set the FD_CLOEXEC flag on the directory */
780
864
ret = set_cloexec_flag(dir_fd);
781
865
if(ret < 0){
782
perror("set_cloexec_flag");
783
TEMP_FAILURE_RETRY(close(dir_fd));
784
exitstatus = EXIT_FAILURE;
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
785
868
goto fallback;
786
869
}
787
870
#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;
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
}
795
894
}
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;
796
905
}
797
906
798
907
FD_ZERO(&rfds_all);
799
908
800
909
/* 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");
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]);
873
916
continue;
874
917
}
875
876
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
877
919
if(ret == -1){
878
perror("stat");
879
free(filename);
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
880
923
continue;
881
924
}
882
925
883
926
/* Ignore non-executable files */
884
927
if(not S_ISREG(st.st_mode)
885
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
886
930
if(debug){
887
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
888
" with bad type or mode\n", filename);
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);
889
935
}
890
free(filename);
936
close(plugin_fd);
937
free(direntries[i]);
891
938
continue;
892
939
}
893
940
894
plugin *p = getplugin(dirst->d_name);
941
plugin *p = getplugin(direntries[i]->d_name);
895
942
if(p == NULL){
896
perror("getplugin");
897
free(filename);
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
898
946
continue;
899
947
}
900
948
if(p->disabled){
901
949
if(debug){
902
950
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
903
dirst->d_name);
951
direntries[i]->d_name);
904
952
}
905
free(filename);
953
close(plugin_fd);
954
free(direntries[i]);
906
955
continue;
907
956
}
908
957
{
911
960
if(g != NULL){
912
961
for(char **a = g->argv + 1; *a != NULL; a++){
913
962
if(not add_argument(p, *a)){
914
perror("add_argument");
963
error(0, errno, "add_argument");
915
964
}
916
965
}
917
966
/* Add global environment variables */
918
967
for(char **e = g->environ; *e != NULL; e++){
919
968
if(not add_environment(p, *e, false)){
920
perror("add_environment");
969
error(0, errno, "add_environment");
921
970
}
922
971
}
923
972
}
924
973
}
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. */
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
928
976
if(p->environ[0] != NULL){
929
977
for(char **e = environ; *e != NULL; e++){
930
978
if(not add_environment(p, *e, false)){
931
perror("add_environment");
979
error(0, errno, "add_environment");
932
980
}
933
981
}
934
982
}
935
983
936
984
int pipefd[2];
985
#ifndef O_CLOEXEC
937
986
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 */
938
990
if(ret == -1){
939
perror("pipe");
940
exitstatus = EXIT_FAILURE;
941
goto fallback;
942
}
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
943
1006
/* Ask OS to automatic close the pipe on exec */
944
1007
ret = set_cloexec_flag(pipefd[0]);
945
1008
if(ret < 0){
946
perror("set_cloexec_flag");
947
exitstatus = EXIT_FAILURE;
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
948
1014
goto fallback;
949
1015
}
950
1016
ret = set_cloexec_flag(pipefd[1]);
951
1017
if(ret < 0){
952
perror("set_cloexec_flag");
953
exitstatus = EXIT_FAILURE;
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
954
1023
goto fallback;
955
1024
}
1025
#endif /* not O_CLOEXEC */
956
1026
/* Block SIGCHLD until process is safely in process list */
957
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
958
1028
&sigchld_action.sa_mask,
959
1029
NULL));
960
1030
if(ret < 0){
961
perror("sigprocmask");
962
exitstatus = EXIT_FAILURE;
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
963
1034
goto fallback;
964
1035
}
965
1036
/* Starting a new process to be watched */
968
1039
pid = fork();
969
1040
} while(pid == -1 and errno == EINTR);
970
1041
if(pid == -1){
971
perror("fork");
972
exitstatus = EXIT_FAILURE;
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]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
973
1049
goto fallback;
974
1050
}
975
1051
if(pid == 0){
976
1052
/* this is the child process */
977
1053
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
978
1054
if(ret < 0){
979
perror("sigaction");
980
_exit(EXIT_FAILURE);
1055
error(0, errno, "sigaction");
1056
_exit(EX_OSERR);
981
1057
}
982
1058
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
983
1059
if(ret < 0){
984
perror("sigprocmask");
985
_exit(EXIT_FAILURE);
1060
error(0, errno, "sigprocmask");
1061
_exit(EX_OSERR);
986
1062
}
987
1063
988
1064
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
989
1065
if(ret == -1){
990
perror("dup2");
991
_exit(EXIT_FAILURE);
1066
error(0, errno, "dup2");
1067
_exit(EX_OSERR);
992
1068
}
993
1069
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
}
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);
1009
1076
}
1010
1077
/* no return */
1011
1078
}
1012
1079
/* 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);
1080
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1017
1083
if(new_plugin == NULL){
1018
perror("getplugin");
1084
error(0, errno, "getplugin");
1019
1085
ret = (int)(TEMP_FAILURE_RETRY
1020
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1021
1087
NULL)));
1022
1088
if(ret < 0){
1023
perror("sigprocmask");
1089
error(0, errno, "sigprocmask");
1024
1090
}
1025
exitstatus = EXIT_FAILURE;
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
1026
1093
goto fallback;
1027
1094
}
1095
free(direntries[i]);
1028
1096
1029
1097
new_plugin->pid = pid;
1030
1098
new_plugin->fd = pipefd[0];
1031
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
/* Unblock SIGCHLD so signal handler can be run if this process
1033
1106
has already completed */
1034
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1035
1108
&sigchld_action.sa_mask,
1036
1109
NULL));
1037
1110
if(ret < 0){
1038
perror("sigprocmask");
1039
exitstatus = EXIT_FAILURE;
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
1040
1113
goto fallback;
1041
1114
}
1042
1115
1043
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1044
-Wconversion */
1116
FD_SET(new_plugin->fd, &rfds_all);
1045
1117
1046
1118
if(maxfd < new_plugin->fd){
1047
1119
maxfd = new_plugin->fd;
1048
1120
}
1049
1121
}
1050
1122
1051
TEMP_FAILURE_RETRY(closedir(dir));
1052
dir = NULL;
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1053
1127
free_plugin(getplugin(NULL));
1054
1128
1055
1129
for(plugin *p = plugin_list; p != NULL; p = p->next){
1068
1142
fd_set rfds = rfds_all;
1069
1143
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1070
1144
if(select_ret == -1 and errno != EINTR){
1071
perror("select");
1072
exitstatus = EXIT_FAILURE;
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
1073
1147
goto fallback;
1074
1148
}
1075
1149
/* OK, now either a process completed, or something can be read
1094
1168
(intmax_t) (proc->pid),
1095
1169
WTERMSIG(proc->status),
1096
1170
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
1171
}
1101
1172
}
1102
1173
1103
1174
/* Remove the plugin */
1104
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1105
-Wconversion */
1175
FD_CLR(proc->fd, &rfds_all);
1106
1176
1107
1177
/* Block signal while modifying process_list */
1108
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
1180
&sigchld_action.sa_mask,
1111
1181
NULL));
1112
1182
if(ret < 0){
1113
perror("sigprocmask");
1114
exitstatus = EXIT_FAILURE;
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
1115
1185
goto fallback;
1116
1186
}
1117
1187
1124
1194
(sigprocmask(SIG_UNBLOCK,
1125
1195
&sigchld_action.sa_mask, NULL)));
1126
1196
if(ret < 0){
1127
perror("sigprocmask");
1128
exitstatus = EXIT_FAILURE;
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
1129
1199
goto fallback;
1130
1200
}
1131
1201
1141
1211
bool bret = print_out_password(proc->buffer,
1142
1212
proc->buffer_length);
1143
1213
if(not bret){
1144
perror("print_out_password");
1145
exitstatus = EXIT_FAILURE;
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
1146
1216
}
1147
1217
goto fallback;
1148
1218
}
1149
1219
1150
1220
/* 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 */
1221
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1154
1222
/* This process had nothing to say at this time */
1155
1223
proc = proc->next;
1156
1224
continue;
1157
1225
}
1158
1226
/* Before reading, make the process' data buffer large enough */
1159
1227
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;
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");
1232
exitstatus = EX_OSERR;
1165
1233
goto fallback;
1166
1234
}
1235
proc->buffer = new_buffer;
1167
1236
proc->buffer_size += BUFFER_SIZE;
1168
1237
}
1169
1238
/* Read from the process */
1188
1257
1189
1258
fallback:
1190
1259
1191
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1192
1262
/* Fallback if all plugins failed, none are found or an error
1193
1263
occured */
1194
1264
bool bret;
1202
1272
}
1203
1273
bret = print_out_password(passwordbuffer, len);
1204
1274
if(not bret){
1205
perror("print_out_password");
1206
exitstatus = EXIT_FAILURE;
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
1207
1277
}
1208
1278
}
1209
1279
1210
1280
/* Restore old signal handler */
1211
1281
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1212
1282
if(ret == -1){
1213
perror("sigaction");
1214
exitstatus = EXIT_FAILURE;
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
1215
1285
}
1216
1286
1217
1287
if(custom_argv != NULL){
1221
1291
free(custom_argv);
1222
1292
}
1223
1293
1224
if(dir != NULL){
1225
closedir(dir);
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
1226
1298
}
1227
1299
1228
1300
/* Kill the processes */
1232
1304
ret = kill(p->pid, SIGTERM);
1233
1305
if(ret == -1 and errno != ESRCH){
1234
1306
/* Set-uid proccesses might not get closed */
1235
perror("kill");
1307
error(0, errno, "kill");
1236
1308
}
1237
1309
}
1238
1310
}
1242
1314
ret = wait(NULL);
1243
1315
} while(ret >= 0);
1244
1316
if(errno != ECHILD){
1245
perror("wait");
1317
error(0, errno, "wait");
1246
1318
}
1247
1319
1248
1320
free_plugin_list();
1249
1321
1250
1322
free(plugindir);
1323
free(pluginhelperdir);
1251
1324
free(argfile);
1252
1325
1253
1326
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0