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- Committer: Teddy Hogeborn
- Date: 2018-08-19 14:58:40 UTC
- Revision ID: teddy@recompile.se-20180819145840-s1a3xar41lyoq4ty
Set executable permissions on new files
* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -
* initramfs-tools-script-stop: Did "chmod +x".
* mandos-to-cryptroot-unlock: - '' -
- 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() */
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
*/
544
583
if(arg[0] == '\0'){
545
584
break;
546
585
}
586
/* FALLTHROUGH */
547
587
default:
548
588
return ARGP_ERR_UNKNOWN;
549
589
}
568
608
case 129: /* --config-file */
569
609
free(argfile);
570
610
argfile = strdup(arg);
611
if(argfile != NULL){
612
errno = 0;
613
}
571
614
break;
572
615
case 130: /* --userid */
573
616
case 131: /* --groupid */
574
617
case 132: /* --debug */
618
case 133: /* --plugin-helper-dir */
575
619
case '?': /* --help */
576
620
case -3: /* --usage */
577
621
case 'V': /* --version */
599
643
case ENOMEM:
600
644
default:
601
645
errno = ret;
602
perror("argp_parse");
646
error(0, errno, "argp_parse");
603
647
exitstatus = EX_OSERR;
604
648
goto fallback;
605
649
case EINVAL:
626
670
custom_argc = 1;
627
671
custom_argv = malloc(sizeof(char*) * 2);
628
672
if(custom_argv == NULL){
629
perror("malloc");
673
error(0, errno, "malloc");
630
674
exitstatus = EX_OSERR;
631
675
goto fallback;
632
676
}
649
693
}
650
694
new_arg = strdup(p);
651
695
if(new_arg == NULL){
652
perror("strdup");
696
error(0, errno, "strdup");
653
697
exitstatus = EX_OSERR;
654
698
free(org_line);
655
699
goto fallback;
656
700
}
657
701
658
702
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;
703
{
704
char **new_argv = realloc(custom_argv, sizeof(char *)
705
* ((size_t)custom_argc + 1));
706
if(new_argv == NULL){
707
error(0, errno, "realloc");
708
exitstatus = EX_OSERR;
709
free(new_arg);
710
free(org_line);
711
goto fallback;
712
} else {
713
custom_argv = new_argv;
714
}
666
715
}
667
716
custom_argv[custom_argc-1] = new_arg;
668
717
custom_argv[custom_argc] = NULL;
672
721
ret = fclose(conffp);
673
722
} while(ret == EOF and errno == EINTR);
674
723
if(ret == EOF){
675
perror("fclose");
724
error(0, errno, "fclose");
676
725
exitstatus = EX_IOERR;
677
726
goto fallback;
678
727
}
681
730
/* Check for harmful errors and go to fallback. Other errors might
682
731
not affect opening plugins */
683
732
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
perror("fopen");
733
error(0, errno, "fopen");
685
734
exitstatus = EX_OSERR;
686
735
goto fallback;
687
736
}
698
747
case ENOMEM:
699
748
default:
700
749
errno = ret;
701
perror("argp_parse");
750
error(0, errno, "argp_parse");
702
751
exitstatus = EX_OSERR;
703
752
goto fallback;
704
753
case EINVAL:
718
767
case ENOMEM:
719
768
default:
720
769
errno = ret;
721
perror("argp_parse");
770
error(0, errno, "argp_parse");
722
771
exitstatus = EX_OSERR;
723
772
goto fallback;
724
773
case EINVAL:
726
775
goto fallback;
727
776
}
728
777
778
{
779
char *pluginhelperenv;
780
bool bret = true;
781
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
782
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
783
if(ret != -1){
784
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
785
}
786
if(ret == -1 or not bret){
787
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
788
" environment variable to \"%s\" for all plugins\n",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
}
791
if(ret != -1){
792
free(pluginhelperenv);
793
}
794
}
795
729
796
if(debug){
730
for(plugin *p = plugin_list; p != NULL; p=p->next){
797
for(plugin *p = plugin_list; p != NULL; p = p->next){
731
798
fprintf(stderr, "Plugin: %s has %d arguments\n",
732
799
p->name ? p->name : "Global", p->argc - 1);
733
800
for(char **a = p->argv; *a != NULL; a++){
740
807
}
741
808
}
742
809
743
/* Strip permissions down to nobody */
744
setgid(gid);
810
if(getuid() == 0){
811
/* Work around Debian bug #633582:
812
<https://bugs.debian.org/633582> */
813
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
814
if(plugindir_fd == -1){
815
if(errno != ENOENT){
816
error(0, errno, "open(\"" PDIR "\")");
817
}
818
} else {
819
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
820
if(ret == -1){
821
error(0, errno, "fstat");
822
} else {
823
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
824
ret = fchown(plugindir_fd, uid, gid);
825
if(ret == -1){
826
error(0, errno, "fchown");
827
}
828
}
829
}
830
close(plugindir_fd);
831
}
832
}
833
834
/* Lower permissions */
835
ret = setgid(gid);
745
836
if(ret == -1){
746
perror("setgid");
837
error(0, errno, "setgid");
747
838
}
748
839
ret = setuid(uid);
749
840
if(ret == -1){
750
perror("setuid");
841
error(0, errno, "setuid");
751
842
}
752
843
753
844
/* Open plugin directory with close_on_exec flag */
754
845
{
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
}
846
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
847
#ifdef O_CLOEXEC
848
O_CLOEXEC
849
#else /* not O_CLOEXEC */
850
0
851
#endif /* not O_CLOEXEC */
852
);
773
853
if(dir_fd == -1){
774
perror("Could not open plugin dir");
854
error(0, errno, "Could not open plugin dir");
775
855
exitstatus = EX_UNAVAILABLE;
776
856
goto fallback;
777
857
}
780
860
/* Set the FD_CLOEXEC flag on the directory */
781
861
ret = set_cloexec_flag(dir_fd);
782
862
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
863
error(0, errno, "set_cloexec_flag");
785
864
exitstatus = EX_OSERR;
786
865
goto fallback;
787
866
}
788
867
#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;
868
}
869
870
int good_name(const struct dirent * const dirent){
871
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
872
"*.dpkg-old", "*.dpkg-bak",
873
"*.dpkg-divert", NULL };
874
#ifdef __GNUC__
875
#pragma GCC diagnostic push
876
#pragma GCC diagnostic ignored "-Wcast-qual"
877
#endif
878
for(const char **pat = (const char **)patterns;
879
*pat != NULL; pat++){
880
#ifdef __GNUC__
881
#pragma GCC diagnostic pop
882
#endif
883
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
884
!= FNM_NOMATCH){
885
if(debug){
886
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
887
" matching pattern %s\n", dirent->d_name, *pat);
888
}
889
return 0;
890
}
796
891
}
892
return 1;
893
}
894
895
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
896
alphasort);
897
if(numplugins == -1){
898
error(0, errno, "Could not scan plugin dir");
899
direntries = NULL;
900
exitstatus = EX_OSERR;
901
goto fallback;
797
902
}
798
903
799
904
FD_ZERO(&rfds_all);
800
905
801
906
/* 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");
907
for(int i = 0; i < numplugins; i++){
908
909
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
910
if(plugin_fd == -1){
911
error(0, errno, "Could not open plugin");
912
free(direntries[i]);
874
913
continue;
875
914
}
876
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
915
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
878
916
if(ret == -1){
879
perror("stat");
880
free(filename);
917
error(0, errno, "stat");
918
close(plugin_fd);
919
free(direntries[i]);
881
920
continue;
882
921
}
883
922
884
923
/* Ignore non-executable files */
885
924
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
925
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
926
X_OK, 0)) != 0)){
887
927
if(debug){
888
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
" with bad type or mode\n", filename);
928
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
929
" with bad type or mode\n",
930
plugindir != NULL ? plugindir : PDIR,
931
direntries[i]->d_name);
890
932
}
891
free(filename);
933
close(plugin_fd);
934
free(direntries[i]);
892
935
continue;
893
936
}
894
937
895
plugin *p = getplugin(dirst->d_name);
938
plugin *p = getplugin(direntries[i]->d_name);
896
939
if(p == NULL){
897
perror("getplugin");
898
free(filename);
940
error(0, errno, "getplugin");
941
close(plugin_fd);
942
free(direntries[i]);
899
943
continue;
900
944
}
901
945
if(p->disabled){
902
946
if(debug){
903
947
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
904
dirst->d_name);
948
direntries[i]->d_name);
905
949
}
906
free(filename);
950
close(plugin_fd);
951
free(direntries[i]);
907
952
continue;
908
953
}
909
954
{
912
957
if(g != NULL){
913
958
for(char **a = g->argv + 1; *a != NULL; a++){
914
959
if(not add_argument(p, *a)){
915
perror("add_argument");
960
error(0, errno, "add_argument");
916
961
}
917
962
}
918
963
/* Add global environment variables */
919
964
for(char **e = g->environ; *e != NULL; e++){
920
965
if(not add_environment(p, *e, false)){
921
perror("add_environment");
966
error(0, errno, "add_environment");
922
967
}
923
968
}
924
969
}
925
970
}
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. */
971
/* If this plugin has any environment variables, we need to
972
duplicate the environment from this process, too. */
929
973
if(p->environ[0] != NULL){
930
974
for(char **e = environ; *e != NULL; e++){
931
975
if(not add_environment(p, *e, false)){
932
perror("add_environment");
976
error(0, errno, "add_environment");
933
977
}
934
978
}
935
979
}
936
980
937
981
int pipefd[2];
982
#ifndef O_CLOEXEC
938
983
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
984
#else /* O_CLOEXEC */
985
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
986
#endif /* O_CLOEXEC */
939
987
if(ret == -1){
940
perror("pipe");
941
exitstatus = EX_OSERR;
942
goto fallback;
943
}
988
error(0, errno, "pipe");
989
exitstatus = EX_OSERR;
990
free(direntries[i]);
991
goto fallback;
992
}
993
if(pipefd[0] >= FD_SETSIZE){
994
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
995
FD_SETSIZE);
996
close(pipefd[0]);
997
close(pipefd[1]);
998
exitstatus = EX_OSERR;
999
free(direntries[i]);
1000
goto fallback;
1001
}
1002
#ifndef O_CLOEXEC
944
1003
/* Ask OS to automatic close the pipe on exec */
945
1004
ret = set_cloexec_flag(pipefd[0]);
946
1005
if(ret < 0){
947
perror("set_cloexec_flag");
1006
error(0, errno, "set_cloexec_flag");
1007
close(pipefd[0]);
1008
close(pipefd[1]);
948
1009
exitstatus = EX_OSERR;
1010
free(direntries[i]);
949
1011
goto fallback;
950
1012
}
951
1013
ret = set_cloexec_flag(pipefd[1]);
952
1014
if(ret < 0){
953
perror("set_cloexec_flag");
1015
error(0, errno, "set_cloexec_flag");
1016
close(pipefd[0]);
1017
close(pipefd[1]);
954
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
955
1020
goto fallback;
956
1021
}
1022
#endif /* not O_CLOEXEC */
957
1023
/* Block SIGCHLD until process is safely in process list */
958
1024
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
1025
&sigchld_action.sa_mask,
960
1026
NULL));
961
1027
if(ret < 0){
962
perror("sigprocmask");
1028
error(0, errno, "sigprocmask");
963
1029
exitstatus = EX_OSERR;
1030
free(direntries[i]);
964
1031
goto fallback;
965
1032
}
966
1033
/* Starting a new process to be watched */
969
1036
pid = fork();
970
1037
} while(pid == -1 and errno == EINTR);
971
1038
if(pid == -1){
972
perror("fork");
1039
error(0, errno, "fork");
1040
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1041
&sigchld_action.sa_mask, NULL));
1042
close(pipefd[0]);
1043
close(pipefd[1]);
973
1044
exitstatus = EX_OSERR;
1045
free(direntries[i]);
974
1046
goto fallback;
975
1047
}
976
1048
if(pid == 0){
977
1049
/* this is the child process */
978
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
1051
if(ret < 0){
980
perror("sigaction");
1052
error(0, errno, "sigaction");
981
1053
_exit(EX_OSERR);
982
1054
}
983
1055
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
1056
if(ret < 0){
985
perror("sigprocmask");
1057
error(0, errno, "sigprocmask");
986
1058
_exit(EX_OSERR);
987
1059
}
988
1060
989
1061
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
1062
if(ret == -1){
991
perror("dup2");
1063
error(0, errno, "dup2");
992
1064
_exit(EX_OSERR);
993
1065
}
994
1066
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
}
1067
if(fexecve(plugin_fd, p->argv,
1068
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1069
error(0, errno, "fexecve for %s/%s",
1070
plugindir != NULL ? plugindir : PDIR,
1071
direntries[i]->d_name);
1072
_exit(EX_OSERR);
1010
1073
}
1011
1074
/* no return */
1012
1075
}
1013
1076
/* 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);
1077
close(pipefd[1]); /* Close unused write end of pipe */
1078
close(plugin_fd);
1079
plugin *new_plugin = getplugin(direntries[i]->d_name);
1018
1080
if(new_plugin == NULL){
1019
perror("getplugin");
1081
error(0, errno, "getplugin");
1020
1082
ret = (int)(TEMP_FAILURE_RETRY
1021
1083
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
1084
NULL)));
1023
1085
if(ret < 0){
1024
perror("sigprocmask");
1086
error(0, errno, "sigprocmask");
1025
1087
}
1026
1088
exitstatus = EX_OSERR;
1089
free(direntries[i]);
1027
1090
goto fallback;
1028
1091
}
1092
free(direntries[i]);
1029
1093
1030
1094
new_plugin->pid = pid;
1031
1095
new_plugin->fd = pipefd[0];
1032
1096
1097
if(debug){
1098
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1099
new_plugin->name, (intmax_t) (new_plugin->pid));
1100
}
1101
1033
1102
/* Unblock SIGCHLD so signal handler can be run if this process
1034
1103
has already completed */
1035
1104
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
1105
&sigchld_action.sa_mask,
1037
1106
NULL));
1038
1107
if(ret < 0){
1039
perror("sigprocmask");
1108
error(0, errno, "sigprocmask");
1040
1109
exitstatus = EX_OSERR;
1041
1110
goto fallback;
1042
1111
}
1043
1112
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
1113
FD_SET(new_plugin->fd, &rfds_all);
1046
1114
1047
1115
if(maxfd < new_plugin->fd){
1048
1116
maxfd = new_plugin->fd;
1049
1117
}
1050
1118
}
1051
1119
1052
TEMP_FAILURE_RETRY(closedir(dir));
1053
dir = NULL;
1120
free(direntries);
1121
direntries = NULL;
1122
close(dir_fd);
1123
dir_fd = -1;
1054
1124
free_plugin(getplugin(NULL));
1055
1125
1056
1126
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
1139
fd_set rfds = rfds_all;
1070
1140
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
1141
if(select_ret == -1 and errno != EINTR){
1072
perror("select");
1142
error(0, errno, "select");
1073
1143
exitstatus = EX_OSERR;
1074
1144
goto fallback;
1075
1145
}
1095
1165
(intmax_t) (proc->pid),
1096
1166
WTERMSIG(proc->status),
1097
1167
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
1168
}
1102
1169
}
1103
1170
1104
1171
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1172
FD_CLR(proc->fd, &rfds_all);
1107
1173
1108
1174
/* Block signal while modifying process_list */
1109
1175
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1111
1177
&sigchld_action.sa_mask,
1112
1178
NULL));
1113
1179
if(ret < 0){
1114
perror("sigprocmask");
1180
error(0, errno, "sigprocmask");
1115
1181
exitstatus = EX_OSERR;
1116
1182
goto fallback;
1117
1183
}
1125
1191
(sigprocmask(SIG_UNBLOCK,
1126
1192
&sigchld_action.sa_mask, NULL)));
1127
1193
if(ret < 0){
1128
perror("sigprocmask");
1194
error(0, errno, "sigprocmask");
1129
1195
exitstatus = EX_OSERR;
1130
1196
goto fallback;
1131
1197
}
1142
1208
bool bret = print_out_password(proc->buffer,
1143
1209
proc->buffer_length);
1144
1210
if(not bret){
1145
perror("print_out_password");
1211
error(0, errno, "print_out_password");
1146
1212
exitstatus = EX_IOERR;
1147
1213
}
1148
1214
goto fallback;
1149
1215
}
1150
1216
1151
1217
/* 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 */
1218
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
1219
/* This process had nothing to say at this time */
1156
1220
proc = proc->next;
1157
1221
continue;
1158
1222
}
1159
1223
/* Before reading, make the process' data buffer large enough */
1160
1224
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");
1225
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1226
+ (size_t) BUFFER_SIZE);
1227
if(new_buffer == NULL){
1228
error(0, errno, "malloc");
1165
1229
exitstatus = EX_OSERR;
1166
1230
goto fallback;
1167
1231
}
1232
proc->buffer = new_buffer;
1168
1233
proc->buffer_size += BUFFER_SIZE;
1169
1234
}
1170
1235
/* Read from the process */
1204
1269
}
1205
1270
bret = print_out_password(passwordbuffer, len);
1206
1271
if(not bret){
1207
perror("print_out_password");
1272
error(0, errno, "print_out_password");
1208
1273
exitstatus = EX_IOERR;
1209
1274
}
1210
1275
}
1212
1277
/* Restore old signal handler */
1213
1278
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
1279
if(ret == -1){
1215
perror("sigaction");
1280
error(0, errno, "sigaction");
1216
1281
exitstatus = EX_OSERR;
1217
1282
}
1218
1283
1223
1288
free(custom_argv);
1224
1289
}
1225
1290
1226
if(dir != NULL){
1227
closedir(dir);
1291
free(direntries);
1292
1293
if(dir_fd != -1){
1294
close(dir_fd);
1228
1295
}
1229
1296
1230
1297
/* Kill the processes */
1234
1301
ret = kill(p->pid, SIGTERM);
1235
1302
if(ret == -1 and errno != ESRCH){
1236
1303
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1304
error(0, errno, "kill");
1238
1305
}
1239
1306
}
1240
1307
}
1244
1311
ret = wait(NULL);
1245
1312
} while(ret >= 0);
1246
1313
if(errno != ECHILD){
1247
perror("wait");
1314
error(0, errno, "wait");
1248
1315
}
1249
1316
1250
1317
free_plugin_list();
1251
1318
1252
1319
free(plugindir);
1320
free(pluginhelperdir);
1253
1321
free(argfile);
1254
1322
1255
1323
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0