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- Committer: Teddy Hogeborn
- Date: 2019-03-30 17:02:33 UTC
- Revision ID: teddy@recompile.se-20190330170233-nxu3cgb98q2g3o5j
Fix typo in intro(8mandos).
* intro.xml (INTRODUCTION): Add missing period at end of last sentence
of penultimate paragraph.
* intro.xml (INTRODUCTION): Add missing period at end of last sentence
of penultimate paragraph.
- 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
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
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(), strcmp(), strncmp() */
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,
70
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
73
75
74
76
#define BUFFER_SIZE 256
75
77
76
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
77
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
81
79
82
const char *argp_program_version = "plugin-runner " VERSION;
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
81
84
82
85
typedef struct plugin{
83
86
char *name; /* can be NULL or any plugin name */
103
106
104
107
/* Gets an existing plugin based on name,
105
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
106
110
static plugin *getplugin(char *name){
107
111
/* Check for existing plugin with that name */
108
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
169
173
}
170
174
171
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
172
177
static bool add_to_char_array(const char *new, char ***array,
173
178
int *len){
174
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
175
181
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} 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);
179
185
/* Malloc check */
180
if(*array == NULL){
186
if(new_array == NULL){
181
187
return false;
182
188
}
189
*array = new_array;
183
190
/* Make a copy of the new string */
184
191
char *copy;
185
192
do {
197
204
}
198
205
199
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
200
208
static bool add_argument(plugin *p, const char *arg){
201
209
if(p == NULL){
202
210
return false;
205
213
}
206
214
207
215
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
208
217
static bool add_environment(plugin *p, const char *def, bool replace){
209
218
if(p == NULL){
210
219
return false;
212
221
/* namelen = length of name of environment variable */
213
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
223
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
217
226
/* It already exists */
218
227
if(replace){
219
char *new;
228
char *new_envdef;
220
229
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
224
233
return false;
225
234
}
226
*e = new;
227
strcpy(*e, def);
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
228
237
}
229
238
return true;
230
239
}
232
241
return add_to_char_array(def, &(p->environ), &(p->envc));
233
242
}
234
243
244
#ifndef O_CLOEXEC
235
245
/*
236
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
247
* Descriptor Flags".
238
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
239
249
*/
250
__attribute__((warn_unused_result))
240
251
static int set_cloexec_flag(int fd){
241
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
242
253
/* If reading the flags failed, return error indication now. */
247
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
259
ret | FD_CLOEXEC));
249
260
}
261
#endif /* not O_CLOEXEC */
250
262
251
263
252
264
/* Mark processes as completed when they exit, and save their exit
266
278
/* No child processes */
267
279
break;
268
280
}
269
perror("waitpid");
281
error(0, errno, "waitpid");
270
282
}
271
283
272
284
/* A child exited, find it in process_list */
284
296
}
285
297
286
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
287
300
static bool print_out_password(const char *buffer, size_t length){
288
301
ssize_t ret;
289
302
for(size_t written = 0; written < length; written += (size_t)ret){
297
310
}
298
311
299
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
300
314
static void free_plugin(plugin *plugin_node){
301
315
302
316
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
334
348
335
349
int main(int argc, char *argv[]){
336
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
337
352
char *argfile = NULL;
338
353
FILE *conffp;
339
size_t d_name_len;
340
DIR *dir = NULL;
341
struct dirent *dirst;
354
struct dirent **direntries = NULL;
342
355
struct stat st;
343
356
fd_set rfds_all;
344
357
int ret, maxfd = 0;
352
365
.sa_flags = SA_NOCLDSTOP };
353
366
char **custom_argv = NULL;
354
367
int custom_argc = 0;
368
int dir_fd = -1;
355
369
356
370
/* Establish a signal handler */
357
371
sigemptyset(&sigchld_action.sa_mask);
358
372
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
373
if(ret == -1){
360
perror("sigaddset");
374
error(0, errno, "sigaddset");
361
375
exitstatus = EX_OSERR;
362
376
goto fallback;
363
377
}
364
378
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
379
if(ret == -1){
366
perror("sigaction");
380
error(0, errno, "sigaction");
367
381
exitstatus = EX_OSERR;
368
382
goto fallback;
369
383
}
402
416
.doc = "Group ID the plugins will run as", .group = 3 },
403
417
{ .name = "debug", .key = 132,
404
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 },
405
423
/*
406
424
* These reproduce what we would get without ARGP_NO_HELP
407
425
*/
414
432
{ .name = NULL }
415
433
};
416
434
435
__attribute__((nonnull(3)))
417
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
437
errno = 0;
419
438
switch(key){
420
439
char *tmp;
421
intmax_t tmpmax;
440
intmax_t tmp_id;
422
441
case 'g': /* --global-options */
423
442
{
424
443
char *plugin_option;
427
446
break;
428
447
}
429
448
}
449
errno = 0;
430
450
}
431
451
break;
432
452
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
434
456
break;
435
457
case 'o': /* --options-for */
436
458
{
453
475
break;
454
476
}
455
477
}
478
errno = 0;
456
479
}
457
480
break;
458
481
case 'E': /* --env-for */
470
493
errno = EINVAL;
471
494
break;
472
495
}
473
add_environment(getplugin(arg), envdef, true);
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
474
499
}
475
500
break;
476
501
case 'd': /* --disable */
478
503
plugin *p = getplugin(arg);
479
504
if(p != NULL){
480
505
p->disabled = true;
506
errno = 0;
481
507
}
482
508
}
483
509
break;
486
512
plugin *p = getplugin(arg);
487
513
if(p != NULL){
488
514
p->disabled = false;
515
errno = 0;
489
516
}
490
517
}
491
518
break;
492
519
case 128: /* --plugin-dir */
493
520
free(plugindir);
494
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
495
525
break;
496
526
case 129: /* --config-file */
497
527
/* This is already done by parse_opt_config_file() */
498
528
break;
499
529
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
530
tmp_id = strtoimax(arg, &tmp, 10);
501
531
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
532
or tmp_id != (uid_t)tmp_id){
503
533
argp_error(state, "Bad user ID number: \"%s\", using %"
504
534
PRIdMAX, arg, (intmax_t)uid);
505
535
break;
506
536
}
507
uid = (uid_t)tmpmax;
537
uid = (uid_t)tmp_id;
538
errno = 0;
508
539
break;
509
540
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
541
tmp_id = strtoimax(arg, &tmp, 10);
511
542
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
543
or tmp_id != (gid_t)tmp_id){
513
544
argp_error(state, "Bad group ID number: \"%s\", using %"
514
545
PRIdMAX, arg, (intmax_t)gid);
515
546
break;
516
547
}
517
gid = (gid_t)tmpmax;
548
gid = (gid_t)tmp_id;
549
errno = 0;
518
550
break;
519
551
case 132: /* --debug */
520
552
debug = true;
521
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;
522
561
/*
523
562
* These reproduce what we would get without ARGP_NO_HELP
524
563
*/
525
564
case '?': /* --help */
526
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
__builtin_unreachable();
528
568
case -3: /* --usage */
529
569
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
570
argp_state_help(state, state->out_stream,
531
571
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
572
__builtin_unreachable();
532
573
case 'V': /* --version */
533
574
fprintf(state->out_stream, "%s\n", argp_program_version);
534
575
exit(EXIT_SUCCESS);
544
585
if(arg[0] == '\0'){
545
586
break;
546
587
}
588
/* FALLTHROUGH */
547
589
default:
548
590
return ARGP_ERR_UNKNOWN;
549
591
}
568
610
case 129: /* --config-file */
569
611
free(argfile);
570
612
argfile = strdup(arg);
613
if(argfile != NULL){
614
errno = 0;
615
}
571
616
break;
572
617
case 130: /* --userid */
573
618
case 131: /* --groupid */
574
619
case 132: /* --debug */
620
case 133: /* --plugin-helper-dir */
575
621
case '?': /* --help */
576
622
case -3: /* --usage */
577
623
case 'V': /* --version */
599
645
case ENOMEM:
600
646
default:
601
647
errno = ret;
602
perror("argp_parse");
648
error(0, errno, "argp_parse");
603
649
exitstatus = EX_OSERR;
604
650
goto fallback;
605
651
case EINVAL:
626
672
custom_argc = 1;
627
673
custom_argv = malloc(sizeof(char*) * 2);
628
674
if(custom_argv == NULL){
629
perror("malloc");
675
error(0, errno, "malloc");
630
676
exitstatus = EX_OSERR;
631
677
goto fallback;
632
678
}
649
695
}
650
696
new_arg = strdup(p);
651
697
if(new_arg == NULL){
652
perror("strdup");
698
error(0, errno, "strdup");
653
699
exitstatus = EX_OSERR;
654
700
free(org_line);
655
701
goto fallback;
656
702
}
657
703
658
704
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
705
{
706
char **new_argv = realloc(custom_argv, sizeof(char *)
707
* ((size_t)custom_argc + 1));
708
if(new_argv == NULL){
709
error(0, errno, "realloc");
710
exitstatus = EX_OSERR;
711
free(new_arg);
712
free(org_line);
713
goto fallback;
714
} else {
715
custom_argv = new_argv;
716
}
666
717
}
667
718
custom_argv[custom_argc-1] = new_arg;
668
719
custom_argv[custom_argc] = NULL;
672
723
ret = fclose(conffp);
673
724
} while(ret == EOF and errno == EINTR);
674
725
if(ret == EOF){
675
perror("fclose");
726
error(0, errno, "fclose");
676
727
exitstatus = EX_IOERR;
677
728
goto fallback;
678
729
}
681
732
/* Check for harmful errors and go to fallback. Other errors might
682
733
not affect opening plugins */
683
734
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
735
error(0, errno, "fopen");
685
736
exitstatus = EX_OSERR;
686
737
goto fallback;
687
738
}
698
749
case ENOMEM:
699
750
default:
700
751
errno = ret;
701
perror("argp_parse");
752
error(0, errno, "argp_parse");
702
753
exitstatus = EX_OSERR;
703
754
goto fallback;
704
755
case EINVAL:
718
769
case ENOMEM:
719
770
default:
720
771
errno = ret;
721
perror("argp_parse");
772
error(0, errno, "argp_parse");
722
773
exitstatus = EX_OSERR;
723
774
goto fallback;
724
775
case EINVAL:
726
777
goto fallback;
727
778
}
728
779
780
{
781
char *pluginhelperenv;
782
bool bret = true;
783
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
784
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
785
if(ret != -1){
786
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
787
}
788
if(ret == -1 or not bret){
789
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
790
" environment variable to \"%s\" for all plugins\n",
791
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
792
}
793
if(ret != -1){
794
free(pluginhelperenv);
795
}
796
}
797
729
798
if(debug){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
799
for(plugin *p = plugin_list; p != NULL; p = p->next){
731
800
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
801
p->name ? p->name : "Global", p->argc - 1);
733
802
for(char **a = p->argv; *a != NULL; a++){
740
809
}
741
810
}
742
811
743
/* Strip permissions down to nobody */
744
setgid(gid);
812
if(getuid() == 0){
813
/* Work around Debian bug #633582:
814
<https://bugs.debian.org/633582> */
815
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
816
if(plugindir_fd == -1){
817
if(errno != ENOENT){
818
error(0, errno, "open(\"" PDIR "\")");
819
}
820
} else {
821
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
822
if(ret == -1){
823
error(0, errno, "fstat");
824
} else {
825
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
826
ret = fchown(plugindir_fd, uid, gid);
827
if(ret == -1){
828
error(0, errno, "fchown");
829
}
830
}
831
}
832
close(plugindir_fd);
833
}
834
}
835
836
/* Lower permissions */
837
ret = setgid(gid);
745
838
if(ret == -1){
746
perror("setgid");
839
error(0, errno, "setgid");
747
840
}
748
841
ret = setuid(uid);
749
842
if(ret == -1){
750
perror("setuid");
843
error(0, errno, "setuid");
751
844
}
752
845
753
846
/* Open plugin directory with close_on_exec flag */
754
847
{
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
}
848
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
849
#ifdef O_CLOEXEC
850
O_CLOEXEC
851
#else /* not O_CLOEXEC */
852
0
853
#endif /* not O_CLOEXEC */
854
);
773
855
if(dir_fd == -1){
774
perror("Could not open plugin dir");
856
error(0, errno, "Could not open plugin dir");
775
857
exitstatus = EX_UNAVAILABLE;
776
858
goto fallback;
777
859
}
780
862
/* Set the FD_CLOEXEC flag on the directory */
781
863
ret = set_cloexec_flag(dir_fd);
782
864
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
865
error(0, errno, "set_cloexec_flag");
785
866
exitstatus = EX_OSERR;
786
867
goto fallback;
787
868
}
788
869
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
870
}
871
872
int good_name(const struct dirent * const dirent){
873
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
874
"*.dpkg-old", "*.dpkg-bak",
875
"*.dpkg-divert", NULL };
876
#ifdef __GNUC__
877
#pragma GCC diagnostic push
878
#pragma GCC diagnostic ignored "-Wcast-qual"
879
#endif
880
for(const char **pat = (const char **)patterns;
881
*pat != NULL; pat++){
882
#ifdef __GNUC__
883
#pragma GCC diagnostic pop
884
#endif
885
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
886
!= FNM_NOMATCH){
887
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" matching pattern %s\n", dirent->d_name, *pat);
890
}
891
return 0;
892
}
796
893
}
894
return 1;
895
}
896
897
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
898
alphasort);
899
if(numplugins == -1){
900
error(0, errno, "Could not scan plugin dir");
901
direntries = NULL;
902
exitstatus = EX_OSERR;
903
goto fallback;
797
904
}
798
905
799
906
FD_ZERO(&rfds_all);
800
907
801
908
/* Read and execute any executable in the plugin directory*/
802
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
806
807
/* All directory entries have been processed */
808
if(dirst == NULL){
809
if(errno == EBADF){
810
perror("readdir");
811
exitstatus = EX_IOERR;
812
goto fallback;
813
}
814
break;
815
}
816
817
d_name_len = strlen(dirst->d_name);
818
819
/* Ignore dotfiles, backup files and other junk */
820
{
821
bool bad_name = false;
822
823
const char const *bad_prefixes[] = { ".", "#", NULL };
824
825
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
".dpkg-old",
827
".dpkg-bak",
828
".dpkg-divert", NULL };
829
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
size_t pre_len = strlen(*pre);
831
if((d_name_len >= pre_len)
832
and strncmp((dirst->d_name), *pre, pre_len) == 0){
833
if(debug){
834
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
835
" with bad prefix %s\n", dirst->d_name, *pre);
836
}
837
bad_name = true;
838
break;
839
}
840
}
841
if(bad_name){
842
continue;
843
}
844
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
size_t suf_len = strlen(*suf);
846
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
848
== 0)){
849
if(debug){
850
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
851
" with bad suffix %s\n", dirst->d_name, *suf);
852
}
853
bad_name = true;
854
break;
855
}
856
}
857
858
if(bad_name){
859
continue;
860
}
861
}
862
863
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
872
if(ret < 0){
873
perror("asprintf");
909
for(int i = 0; i < numplugins; i++){
910
911
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
912
if(plugin_fd == -1){
913
error(0, errno, "Could not open plugin");
914
free(direntries[i]);
874
915
continue;
875
916
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
917
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
918
if(ret == -1){
879
perror("stat");
880
free(filename);
919
error(0, errno, "stat");
920
close(plugin_fd);
921
free(direntries[i]);
881
922
continue;
882
923
}
883
924
884
925
/* Ignore non-executable files */
885
926
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
927
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
928
X_OK, 0)) != 0)){
887
929
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
930
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
931
" with bad type or mode\n",
932
plugindir != NULL ? plugindir : PDIR,
933
direntries[i]->d_name);
890
934
}
891
free(filename);
935
close(plugin_fd);
936
free(direntries[i]);
892
937
continue;
893
938
}
894
939
895
plugin *p = getplugin(dirst->d_name);
940
plugin *p = getplugin(direntries[i]->d_name);
896
941
if(p == NULL){
897
perror("getplugin");
898
free(filename);
942
error(0, errno, "getplugin");
943
close(plugin_fd);
944
free(direntries[i]);
899
945
continue;
900
946
}
901
947
if(p->disabled){
902
948
if(debug){
903
949
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
950
direntries[i]->d_name);
905
951
}
906
free(filename);
952
close(plugin_fd);
953
free(direntries[i]);
907
954
continue;
908
955
}
909
956
{
912
959
if(g != NULL){
913
960
for(char **a = g->argv + 1; *a != NULL; a++){
914
961
if(not add_argument(p, *a)){
915
perror("add_argument");
962
error(0, errno, "add_argument");
916
963
}
917
964
}
918
965
/* Add global environment variables */
919
966
for(char **e = g->environ; *e != NULL; e++){
920
967
if(not add_environment(p, *e, false)){
921
perror("add_environment");
968
error(0, errno, "add_environment");
922
969
}
923
970
}
924
971
}
925
972
}
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. */
973
/* If this plugin has any environment variables, we need to
974
duplicate the environment from this process, too. */
929
975
if(p->environ[0] != NULL){
930
976
for(char **e = environ; *e != NULL; e++){
931
977
if(not add_environment(p, *e, false)){
932
perror("add_environment");
978
error(0, errno, "add_environment");
933
979
}
934
980
}
935
981
}
936
982
937
983
int pipefd[2];
984
#ifndef O_CLOEXEC
938
985
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
986
#else /* O_CLOEXEC */
987
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
988
#endif /* O_CLOEXEC */
939
989
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
990
error(0, errno, "pipe");
991
exitstatus = EX_OSERR;
992
free(direntries[i]);
993
goto fallback;
994
}
995
if(pipefd[0] >= FD_SETSIZE){
996
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
997
FD_SETSIZE);
998
close(pipefd[0]);
999
close(pipefd[1]);
1000
exitstatus = EX_OSERR;
1001
free(direntries[i]);
1002
goto fallback;
1003
}
1004
#ifndef O_CLOEXEC
944
1005
/* Ask OS to automatic close the pipe on exec */
945
1006
ret = set_cloexec_flag(pipefd[0]);
946
1007
if(ret < 0){
947
perror("set_cloexec_flag");
1008
error(0, errno, "set_cloexec_flag");
1009
close(pipefd[0]);
1010
close(pipefd[1]);
948
1011
exitstatus = EX_OSERR;
1012
free(direntries[i]);
949
1013
goto fallback;
950
1014
}
951
1015
ret = set_cloexec_flag(pipefd[1]);
952
1016
if(ret < 0){
953
perror("set_cloexec_flag");
1017
error(0, errno, "set_cloexec_flag");
1018
close(pipefd[0]);
1019
close(pipefd[1]);
954
1020
exitstatus = EX_OSERR;
1021
free(direntries[i]);
955
1022
goto fallback;
956
1023
}
1024
#endif /* not O_CLOEXEC */
957
1025
/* Block SIGCHLD until process is safely in process list */
958
1026
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1027
&sigchld_action.sa_mask,
960
1028
NULL));
961
1029
if(ret < 0){
962
perror("sigprocmask");
1030
error(0, errno, "sigprocmask");
963
1031
exitstatus = EX_OSERR;
1032
free(direntries[i]);
964
1033
goto fallback;
965
1034
}
966
1035
/* Starting a new process to be watched */
969
1038
pid = fork();
970
1039
} while(pid == -1 and errno == EINTR);
971
1040
if(pid == -1){
972
perror("fork");
1041
error(0, errno, "fork");
1042
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1043
&sigchld_action.sa_mask, NULL));
1044
close(pipefd[0]);
1045
close(pipefd[1]);
973
1046
exitstatus = EX_OSERR;
1047
free(direntries[i]);
974
1048
goto fallback;
975
1049
}
976
1050
if(pid == 0){
977
1051
/* this is the child process */
978
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1053
if(ret < 0){
980
perror("sigaction");
1054
error(0, errno, "sigaction");
981
1055
_exit(EX_OSERR);
982
1056
}
983
1057
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1058
if(ret < 0){
985
perror("sigprocmask");
1059
error(0, errno, "sigprocmask");
986
1060
_exit(EX_OSERR);
987
1061
}
988
1062
989
1063
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1064
if(ret == -1){
991
perror("dup2");
1065
error(0, errno, "dup2");
992
1066
_exit(EX_OSERR);
993
1067
}
994
1068
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
}
1069
if(fexecve(plugin_fd, p->argv,
1070
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1071
error(0, errno, "fexecve for %s/%s",
1072
plugindir != NULL ? plugindir : PDIR,
1073
direntries[i]->d_name);
1074
_exit(EX_OSERR);
1010
1075
}
1011
1076
/* no return */
1012
1077
}
1013
1078
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
1016
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1079
close(pipefd[1]); /* Close unused write end of pipe */
1080
close(plugin_fd);
1081
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1082
if(new_plugin == NULL){
1019
perror("getplugin");
1083
error(0, errno, "getplugin");
1020
1084
ret = (int)(TEMP_FAILURE_RETRY
1021
1085
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1086
NULL)));
1023
1087
if(ret < 0){
1024
perror("sigprocmask");
1088
error(0, errno, "sigprocmask");
1025
1089
}
1026
1090
exitstatus = EX_OSERR;
1091
free(direntries[i]);
1027
1092
goto fallback;
1028
1093
}
1094
free(direntries[i]);
1029
1095
1030
1096
new_plugin->pid = pid;
1031
1097
new_plugin->fd = pipefd[0];
1032
1098
1099
if(debug){
1100
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1101
new_plugin->name, (intmax_t) (new_plugin->pid));
1102
}
1103
1033
1104
/* Unblock SIGCHLD so signal handler can be run if this process
1034
1105
has already completed */
1035
1106
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
1107
&sigchld_action.sa_mask,
1037
1108
NULL));
1038
1109
if(ret < 0){
1039
perror("sigprocmask");
1110
error(0, errno, "sigprocmask");
1040
1111
exitstatus = EX_OSERR;
1041
1112
goto fallback;
1042
1113
}
1043
1114
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1115
FD_SET(new_plugin->fd, &rfds_all);
1046
1116
1047
1117
if(maxfd < new_plugin->fd){
1048
1118
maxfd = new_plugin->fd;
1049
1119
}
1050
1120
}
1051
1121
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1122
free(direntries);
1123
direntries = NULL;
1124
close(dir_fd);
1125
dir_fd = -1;
1054
1126
free_plugin(getplugin(NULL));
1055
1127
1056
1128
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1141
fd_set rfds = rfds_all;
1070
1142
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1143
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1144
error(0, errno, "select");
1073
1145
exitstatus = EX_OSERR;
1074
1146
goto fallback;
1075
1147
}
1095
1167
(intmax_t) (proc->pid),
1096
1168
WTERMSIG(proc->status),
1097
1169
strsignal(WTERMSIG(proc->status)));
1098
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
1101
1170
}
1102
1171
}
1103
1172
1104
1173
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1174
FD_CLR(proc->fd, &rfds_all);
1107
1175
1108
1176
/* Block signal while modifying process_list */
1109
1177
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1179
&sigchld_action.sa_mask,
1112
1180
NULL));
1113
1181
if(ret < 0){
1114
perror("sigprocmask");
1182
error(0, errno, "sigprocmask");
1115
1183
exitstatus = EX_OSERR;
1116
1184
goto fallback;
1117
1185
}
1125
1193
(sigprocmask(SIG_UNBLOCK,
1126
1194
&sigchld_action.sa_mask, NULL)));
1127
1195
if(ret < 0){
1128
perror("sigprocmask");
1196
error(0, errno, "sigprocmask");
1129
1197
exitstatus = EX_OSERR;
1130
1198
goto fallback;
1131
1199
}
1142
1210
bool bret = print_out_password(proc->buffer,
1143
1211
proc->buffer_length);
1144
1212
if(not bret){
1145
perror("print_out_password");
1213
error(0, errno, "print_out_password");
1146
1214
exitstatus = EX_IOERR;
1147
1215
}
1148
1216
goto fallback;
1149
1217
}
1150
1218
1151
1219
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
1220
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1221
/* This process had nothing to say at this time */
1156
1222
proc = proc->next;
1157
1223
continue;
1158
1224
}
1159
1225
/* Before reading, make the process' data buffer large enough */
1160
1226
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
1164
perror("malloc");
1227
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1228
+ (size_t) BUFFER_SIZE);
1229
if(new_buffer == NULL){
1230
error(0, errno, "malloc");
1165
1231
exitstatus = EX_OSERR;
1166
1232
goto fallback;
1167
1233
}
1234
proc->buffer = new_buffer;
1168
1235
proc->buffer_size += BUFFER_SIZE;
1169
1236
}
1170
1237
/* Read from the process */
1204
1271
}
1205
1272
bret = print_out_password(passwordbuffer, len);
1206
1273
if(not bret){
1207
perror("print_out_password");
1274
error(0, errno, "print_out_password");
1208
1275
exitstatus = EX_IOERR;
1209
1276
}
1210
1277
}
1212
1279
/* Restore old signal handler */
1213
1280
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1281
if(ret == -1){
1215
perror("sigaction");
1282
error(0, errno, "sigaction");
1216
1283
exitstatus = EX_OSERR;
1217
1284
}
1218
1285
1223
1290
free(custom_argv);
1224
1291
}
1225
1292
1226
if(dir != NULL){
1227
closedir(dir);
1293
free(direntries);
1294
1295
if(dir_fd != -1){
1296
close(dir_fd);
1228
1297
}
1229
1298
1230
1299
/* Kill the processes */
1234
1303
ret = kill(p->pid, SIGTERM);
1235
1304
if(ret == -1 and errno != ESRCH){
1236
1305
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1306
error(0, errno, "kill");
1238
1307
}
1239
1308
}
1240
1309
}
1244
1313
ret = wait(NULL);
1245
1314
} while(ret >= 0);
1246
1315
if(errno != ECHILD){
1247
perror("wait");
1316
error(0, errno, "wait");
1248
1317
}
1249
1318
1250
1319
free_plugin_list();
1251
1320
1252
1321
free(plugindir);
1322
free(pluginhelperdir);
1253
1323
free(argfile);
1254
1324
1255
1325
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0